/src/haproxy/src/proxy.c

Source
/*
 * Proxy variables and functions.
 *
 * Copyright 2000-2009 Willy Tarreau <w@1wt.eu>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 *
 */

#include <unistd.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>

#include <import/cebis_tree.h>
#include <import/eb32tree.h>

#include <haproxy/acl.h>
#include <haproxy/api.h>
#include <haproxy/applet.h>
#include <haproxy/backend.h>
#include <haproxy/capture-t.h>
#include <haproxy/cfgparse.h>
#include <haproxy/cli.h>
#include <haproxy/counters.h>
#include <haproxy/errors.h>
#include <haproxy/fd.h>
#include <haproxy/filters.h>
#include <haproxy/frontend.h>
#include <haproxy/global.h>
#include <haproxy/guid.h>
#include <haproxy/http_ana.h>
#include <haproxy/http_htx.h>
#include <haproxy/http_ext.h>
#include <haproxy/http_rules.h>
#include <haproxy/mailers.h>
#include <haproxy/listener.h>
#include <haproxy/lb_chash.h>
#include <haproxy/lb_fas.h>
#include <haproxy/lb_fwlc.h>
#include <haproxy/lb_fwrr.h>
#include <haproxy/lb_map.h>
#include <haproxy/lb_ss.h>
#include <haproxy/log.h>
#include <haproxy/obj_type-t.h>
#include <haproxy/openssl-compat.h> /* required for TLSEXT_TYPE_application_layer_protocol_negotiation */
#include <haproxy/peers.h>
#include <haproxy/pool.h>
#include <haproxy/protocol.h>
#include <haproxy/proto_tcp.h>
#include <haproxy/proxy.h>
#include <haproxy/sc_strm.h>
#include <haproxy/quic_tp.h>
#include <haproxy/quic_tune.h>
#include <haproxy/server-t.h>
#include <haproxy/signal.h>
#include <haproxy/stats.h>
#include <haproxy/stconn.h>
#include <haproxy/stream.h>
#include <haproxy/stress.h>
#include <haproxy/task.h>
#include <haproxy/tcpcheck.h>
#include <haproxy/thread.h>
#include <haproxy/time.h>
#include <haproxy/tools.h>
#include <haproxy/uri_auth.h>

/* Lock to ensure multiple backends deletion concurrently is safe */
__decl_spinlock(proxies_del_lock);

int listeners;  /* # of proxy listeners, set by cfgparse */

/* List of non-default and non-internal proxies, except mworker and cli_fe which are stored in it.
 * Used for check_config_validity() post init and most runtime operations (stats, ...).
 */
struct list main_proxies = LIST_HEAD_INIT(main_proxies);

/* List of all proxies, except defaults.
 * Currently only used for post_proxy_check_fct and post_server_check_fct post init.
 */
struct list all_proxies = LIST_HEAD_INIT(all_proxies);

struct ceb_root *used_proxy_id = NULL; /* list of proxy IDs in use */
struct ceb_root *proxy_by_name = NULL; /* tree of proxies sorted by name */
struct ceb_root *defproxy_by_name = NULL; /* tree of default proxies sorted by name (dups possible) */
struct list defaults_list = LIST_HEAD_INIT(defaults_list); /* list of all defaults proxies */
unsigned int error_snapshot_id = 0;     /* global ID assigned to each error then incremented */

unsigned int dynpx_next_id = 0; /* lowest ID assigned to dynamic proxies */

/* CLI context used during "show backend" and "show default-server/defaults" */
struct show_be_ctx {
  struct proxy *px;
  struct watcher px_watch; /* watcher to automatically update px pointer on backend deletion */
};

/* CLI context used during "show servers {state|conn}" */
struct show_srv_ctx {
  struct proxy *px;       /* current proxy to dump or NULL */
  struct server *sv;      /* current server to dump or NULL */
  uint only_pxid;         /* dump only this proxy ID when explicit */
  int show_conn;          /* non-zero = "conn" otherwise "state" */
  enum {
    SHOW_SRV_HEAD = 0,
    SHOW_SRV_LIST,
  } state;

  struct watcher px_watch;  /* watcher to automatically update px on backend deletion */
  struct watcher srv_watch; /* watcher to automatically update sv on server deletion */
};

/* proxy->options. For unsupported ones, pass 0 in the "cap" (PR_CAP_*) field.
 * If this is due to feature removal, the val field can contain the version the
 * option was removed in the "val" (PR_O_*) field as (major<<8)+minor (e.g.
 * 0x305 for "3.5"). Pass zero there to indicate build options instead.
 */
const struct cfg_opt cfg_opts[] =
{
  { "abortonclose", PR_O_ABRT_CLOSE, PR_CAP_BE|PR_CAP_FE, 0, 0 },
  { "allbackups",   PR_O_USE_ALL_BK, PR_CAP_BE, 0, 0 },
  { "checkcache",   PR_O_CHK_CACHE,  PR_CAP_BE, 0, PR_MODE_HTTP },
  { "clitcpka",     PR_O_TCP_CLI_KA, PR_CAP_FE, 0, 0 },
  { "contstats",    PR_O_CONTSTATS,  PR_CAP_FE, 0, 0 },
  { "dontlognull",  PR_O_NULLNOLOG,  PR_CAP_FE, 0, 0 },
  { "http-buffer-request", PR_O_WREQ_BODY,  PR_CAP_FE | PR_CAP_BE, 0, PR_MODE_HTTP },
  { "http-drop-request-trailers", PR_O_HTTP_DROP_REQ_TRLS, PR_CAP_BE, 0, PR_MODE_HTTP },
  { "http-drop-response-trailers", PR_O_HTTP_DROP_RES_TRLS, PR_CAP_FE, 0, PR_MODE_HTTP },
  { "http-ignore-probes", PR_O_IGNORE_PRB, PR_CAP_FE, 0, PR_MODE_HTTP },
  { "idle-close-on-response", PR_O_IDLE_CLOSE_RESP, PR_CAP_FE, 0, PR_MODE_HTTP },
  { "prefer-last-server", PR_O_PREF_LAST,  PR_CAP_BE, 0, PR_MODE_HTTP },
  { "logasap",      PR_O_LOGASAP,    PR_CAP_FE, 0, 0 },
  { "nolinger",     PR_O_TCP_NOLING, PR_CAP_FE | PR_CAP_BE, 0, 0 },
  { "persist",      PR_O_PERSIST,    PR_CAP_BE, 0, 0 },
  { "srvtcpka",     PR_O_TCP_SRV_KA, PR_CAP_BE, 0, 0 },
  { "transparent",  0x305, 0, 0, 0 },

  { NULL, 0, 0, 0, 0 }
};

/* proxy->options2 */
const struct cfg_opt cfg_opts2[] =
{
#ifdef USE_LINUX_SPLICE
  { "splice-request",  PR_O2_SPLIC_REQ, PR_CAP_FE|PR_CAP_BE, 0, 0 },
  { "splice-response", PR_O2_SPLIC_RTR, PR_CAP_FE|PR_CAP_BE, 0, 0 },
  { "splice-auto",     PR_O2_SPLIC_AUT, PR_CAP_FE|PR_CAP_BE, 0, 0 },
#else
        { "splice-request",  0, 0, 0, 0 },
        { "splice-response", 0, 0, 0, 0 },
        { "splice-auto",     0, 0, 0, 0 },
#endif
  { "accept-unsafe-violations-in-http-request",  PR_O2_REQBUG_OK, PR_CAP_FE, 0, PR_MODE_HTTP },
  { "accept-unsafe-violations-in-http-response", PR_O2_RSPBUG_OK, PR_CAP_BE, 0, PR_MODE_HTTP },
  { "dontlog-normal",               PR_O2_NOLOGNORM, PR_CAP_FE, 0, 0 },
  { "log-separate-errors",          PR_O2_LOGERRORS, PR_CAP_FE, 0, 0 },
  { "log-health-checks",            PR_O2_LOGHCHKS,  PR_CAP_BE, 0, 0 },
  { "socket-stats",                 PR_O2_SOCKSTAT,  PR_CAP_FE, 0, 0 },
  { "tcp-smart-accept",             PR_O2_SMARTACC,  PR_CAP_FE, 0, 0 },
  { "tcp-smart-connect",            PR_O2_SMARTCON,  PR_CAP_BE, 0, 0 },
  { "independent-streams",          PR_O2_INDEPSTR,  PR_CAP_FE|PR_CAP_BE, 0, 0 },
  { "http-use-proxy-header",        PR_O2_USE_PXHDR, PR_CAP_FE, 0, PR_MODE_HTTP },
  { "http-pretend-keepalive",       PR_O2_FAKE_KA,   PR_CAP_BE, 0, PR_MODE_HTTP },
  { "http-no-delay",                PR_O2_NODELAY,   PR_CAP_FE|PR_CAP_BE, 0, PR_MODE_HTTP },

  {"h1-case-adjust-bogus-client",   PR_O2_H1_ADJ_BUGCLI, PR_CAP_FE, 0, 0 },
  {"h1-case-adjust-bogus-server",   PR_O2_H1_ADJ_BUGSRV, PR_CAP_BE, 0, 0 },
  {"disable-h2-upgrade",            PR_O2_NO_H2_UPGRADE, PR_CAP_FE, 0, PR_MODE_HTTP },
  { NULL, 0, 0, 0 }
};

/* proxy->options3 */
const struct cfg_opt cfg_opts3[] =
{
  {"assume-rfc6587-ntf",            PR_O3_ASSUME_RFC6587_NTF, PR_CAP_FE, 0, PR_MODE_SYSLOG },
  {"dont-parse-log",                PR_O3_DONTPARSELOG, PR_CAP_FE, 0, PR_MODE_SYSLOG },
  { NULL, 0, 0, 0 }
};

/* Helper function to resolve a single sticking rule after config parsing.
 * Returns 1 for success and 0 for failure
 */
int resolve_stick_rule(struct proxy *curproxy, struct sticking_rule *mrule)
{
  struct stktable *target;

  if (mrule->table.name)
    target = stktable_find_by_name(mrule->table.name);
  else
    target = curproxy->table;

  if (!target) {
    ha_alert("Proxy '%s': unable to find stick-table '%s'.\n",
             curproxy->id, mrule->table.name ? mrule->table.name : curproxy->id);
    return 0;
  }
  else if (!stktable_compatible_sample(mrule->expr, target->type)) {
    ha_alert("Proxy '%s': type of fetch not usable with type of stick-table '%s'.\n",
             curproxy->id, mrule->table.name ? mrule->table.name : curproxy->id);
    return 0;
  }

  /* success */
  ha_free(&mrule->table.name);
  mrule->table.t = target;
  stktable_alloc_data_type(target, STKTABLE_DT_SERVER_ID, NULL, NULL);
  stktable_alloc_data_type(target, STKTABLE_DT_SERVER_KEY, NULL, NULL);
  if (!in_proxies_list(target->proxies_list, curproxy)) {
    curproxy->next_stkt_ref = target->proxies_list;
    target->proxies_list = curproxy;
  }
  return 1;
}

void free_stick_rules(struct list *rules)
{
  struct sticking_rule *rule, *ruleb;

  list_for_each_entry_safe(rule, ruleb, rules, list) {
    LIST_DELETE(&rule->list);
    free_acl_cond(rule->cond);
    release_sample_expr(rule->expr);
    free(rule);
  }
}

void free_server_rules(struct list *srules)
{
  struct server_rule *srule, *sruleb;

  list_for_each_entry_safe(srule, sruleb, srules, list) {
    LIST_DELETE(&srule->list);
    free_acl_cond(srule->cond);
    lf_expr_deinit(&srule->expr);
    free(srule->file);
    free(srule);
  }
}

/* Frees proxy members that are common to all proxy types (either regular or
 * default ones) for a proxy that's about to be destroyed.
 * This is a subset of the complete proxy or default proxy deinit code.
 */
static inline void proxy_free_common(struct proxy *px)
{
  struct acl *acl, *aclb;
  struct logger *log, *logb;
  struct lf_expr *lf, *lfb;

  /* First release from global elements under lock protection. */
  HA_SPIN_LOCK(PROXIES_DEL_LOCK, &proxies_del_lock);
  /* note that the node's key points to p->id */
  cebis_item_delete((px->cap & PR_CAP_DEF) ? &defproxy_by_name : &proxy_by_name, conf.name_node, id, px);
  LIST_DEL_INIT(&px->global_list);
  HA_SPIN_UNLOCK(PROXIES_DEL_LOCK, &proxies_del_lock);

  /* Now release internal proxy elements. */
  ha_free(&px->id);
  drop_file_name(&px->conf.file);
  counters_fe_shared_drop(&px->fe_counters.shared);
  counters_be_shared_drop(&px->be_counters.shared);
  ha_free(&px->check_command);
  ha_free(&px->check_path);
  ha_free(&px->cookie_name);
  ha_free(&px->rdp_cookie_name);
  ha_free(&px->dyncookie_key);
  ha_free(&px->cookie_domain);
  ha_free(&px->cookie_attrs);
  ha_free(&px->lbprm.arg_str);
  ha_free(&px->capture_name);
  istfree(&px->monitor_uri);
  ha_free(&px->conn_src.iface_name);
#if defined(CONFIG_HAP_TRANSPARENT)
  ha_free(&px->conn_src.bind_hdr_name);
#endif
  istfree(&px->server_id_hdr_name);
  istfree(&px->header_unique_id);

  http_ext_clean(px);

  list_for_each_entry_safe(acl, aclb, &px->acl, list) {
    LIST_DELETE(&acl->list);
    prune_acl(acl);
    free(acl);
  }

  free_act_rules(&px->tcp_req.inspect_rules);
  free_act_rules(&px->tcp_rep.inspect_rules);
  free_act_rules(&px->tcp_req.l4_rules);
  free_act_rules(&px->tcp_req.l5_rules);
  free_act_rules(&px->http_req_rules);
  free_act_rules(&px->http_res_rules);
  free_act_rules(&px->http_after_res_rules);
#ifdef USE_QUIC
  free_act_rules(&px->quic_init_rules);
#endif

  lf_expr_deinit(&px->logformat);
  lf_expr_deinit(&px->logformat_sd);
  lf_expr_deinit(&px->logformat_error);
  lf_expr_deinit(&px->format_unique_id);

  list_for_each_entry_safe(log, logb, &px->loggers, list) {
    LIST_DEL_INIT(&log->list);
    free_logger(log);
  }

  /* ensure that remaining lf_expr that were not postchecked (ie: disabled
   * proxy) don't keep a reference on the proxy which is about to be freed.
   */
  list_for_each_entry_safe(lf, lfb, &px->conf.lf_checks, list)
    LIST_DEL_INIT(&lf->list);

  chunk_destroy(&px->log_tag);

  free_email_alert(px);
  stats_uri_auth_drop(px->uri_auth);
  px->uri_auth = NULL;
}

/* deinit all <p> proxy members, but doesn't touch to the parent pointer
 * itself
 */
void deinit_proxy(struct proxy *p)
{
  struct server *s, *s_back;
  struct server *defsrv;
  struct cap_hdr *h,*h_next;
  struct listener *l,*l_next;
  struct bind_conf *bind_conf, *bind_back;
  struct acl_cond *cond, *condb;
  struct switching_rule *rule, *ruleb;
  struct redirect_rule *rdr, *rdrb;
  struct proxy_deinit_fct *pxdf;
  struct server_deinit_fct *srvdf;

  if (!p)
    return;

  proxy_free_common(p);

  /* regular proxy specific cleanup */
  release_sample_expr(p->lbprm.expr);
  free(p->server_state_file_name);
  free(p->invalid_rep);
  free(p->invalid_req);
  if ((p->lbprm.algo & BE_LB_LKUP) == BE_LB_LKUP_MAP)
    free(p->lbprm.map.srv);

  list_for_each_entry_safe(cond, condb, &p->mon_fail_cond, list) {
    LIST_DELETE(&cond->list);
    free_acl_cond(cond);
  }

  guid_remove(&p->guid);

  EXTRA_COUNTERS_FREE(p->extra_counters_fe);
  EXTRA_COUNTERS_FREE(p->extra_counters_be);

  list_for_each_entry_safe(rule, ruleb, &p->persist_rules, list) {
    LIST_DELETE(&rule->list);
    free_acl_cond(rule->cond);
    free(rule);
  }

  free_server_rules(&p->server_rules);

  list_for_each_entry_safe(rule, ruleb, &p->switching_rules, list) {
    LIST_DELETE(&rule->list);
    free_acl_cond(rule->cond);
    if (rule->dynamic)
      lf_expr_deinit(&rule->be.expr);
    free(rule->file);
    free(rule);
  }

  list_for_each_entry_safe(rdr, rdrb, &p->redirect_rules, list) {
    LIST_DELETE(&rdr->list);
    http_free_redirect_rule(rdr);
  }

  free_stick_rules(&p->storersp_rules);
  free_stick_rules(&p->sticking_rules);

  h = p->req_cap;
  while (h) {
    if (p->defpx && h == p->defpx->req_cap)
      break;
    h_next = h->next;
    free(h->name);
    pool_destroy(h->pool);
    free(h);
    h = h_next;
  }/* end while(h) */

  h = p->rsp_cap;
  while (h) {
    if (p->defpx && h == p->defpx->rsp_cap)
      break;
    h_next = h->next;
    free(h->name);
    pool_destroy(h->pool);
    free(h);
    h = h_next;
  }/* end while(h) */

  list_for_each_entry_safe(s, s_back, &p->servers, el_px) {
    list_for_each_entry(srvdf, &server_deinit_list, list)
      srvdf->fct(s);

    if (p->lbprm.ops && p->lbprm.ops->server_deinit)
      p->lbprm.ops->server_deinit(s);

    srv_drop(s);
  }/* end while(s) */

  /* also free default-server parameters since some of them might have
   * been dynamically allocated (e.g.: config hints, cookies, ssl..)
   */
  if (p->defsrv) {
    srv_free_params(p->defsrv);
    srv_free(&p->defsrv);
  }

  while ((defsrv = cebuis_item_first(&p->defsrv_by_name, conf.name_node, id, struct server))) {
    cebuis_item_delete(&p->defsrv_by_name, conf.name_node, id, defsrv);
    srv_free_params(defsrv);
    srv_free(&defsrv);
  }

  if (p->lbprm.ops && p->lbprm.ops->proxy_deinit)
    p->lbprm.ops->proxy_deinit(p);

  list_for_each_entry_safe(l, l_next, &p->conf.listeners, by_fe) {
    guid_remove(&l->guid);
    LIST_DELETE(&l->by_fe);
    LIST_DELETE(&l->by_bind);
    free(l->name);
    free(l->label);
    free(l->per_thr);
    if (l->counters) {
      counters_fe_shared_drop(&l->counters->shared);
      free(l->counters);
    }
    task_destroy(l->rx.rhttp.task);

    EXTRA_COUNTERS_FREE(l->extra_counters);
    free(l);
  }

  /* Release unused SSL configs. */
  list_for_each_entry_safe(bind_conf, bind_back, &p->conf.bind, by_fe) {
    if (bind_conf->xprt->destroy_bind_conf)
      bind_conf->xprt->destroy_bind_conf(bind_conf);
    free(bind_conf->file);
    free(bind_conf->arg);
    free(bind_conf->settings.interface);
    LIST_DELETE(&bind_conf->by_fe);
    free(bind_conf->guid_prefix);
    free(bind_conf->rhttp_srvname);
    free(bind_conf->tcp_md5sig);
    free(bind_conf->cc_algo);
    free(bind_conf);
  }

  flt_deinit(p);

  list_for_each_entry(pxdf, &proxy_deinit_list, list)
    pxdf->fct(p);

  free(p->desc);

  task_destroy(p->task);

  pool_destroy(p->req_cap_pool);
  pool_destroy(p->rsp_cap_pool);

  stktable_deinit(p->table);
  ha_free(&p->table);
  ha_free(&p->per_tgrp);

  HA_RWLOCK_DESTROY(&p->lbprm.lock);
  HA_RWLOCK_DESTROY(&p->lock);

  proxy_unref_defaults(p);
}

/* Decrement <p> refcount and free it if null. For a default proxy instance,
 * refcount is ignored and free is immediately performed.
 */
void proxy_drop(struct proxy *p)
{
  if (!p)
    return;

  if (!(p->cap & PR_CAP_DEF)) {
    if (HA_ATOMIC_SUB_FETCH(&p->refcount, 1))
      return;
  }

  deinit_proxy(p);
  ha_free(&p);
}

/*
 * This function returns a string containing a name describing capabilities to
 * report comprehensible error messages. Specifically, it will return the words
 * "frontend", "backend" when appropriate, "defaults" if it corresponds to a
 * defaults section, or "proxy" for all other cases including the proxies
 * declared in "listen" mode.
 */
const char *proxy_cap_str(int cap)
{
  if (cap & PR_CAP_DEF)
    return "defaults";

  if ((cap & PR_CAP_LISTEN) != PR_CAP_LISTEN) {
    if (cap & PR_CAP_FE)
      return "frontend";
    else if (cap & PR_CAP_BE)
      return "backend";
  }
  return "proxy";
}

/*
 * This function returns a string containing the mode of the proxy in a format
 * suitable for error messages.
 */
const char *proxy_mode_str(int mode) {

  if (mode == PR_MODE_TCP)
    return "tcp";
  else if (mode == PR_MODE_HTTP)
    return "http";
  else if (mode == PR_MODE_CLI)
    return "cli";
  else if (mode == PR_MODE_SYSLOG)
    return "syslog";
  else if (mode == PR_MODE_PEERS)
    return "peers";
  else if (mode == PR_MODE_SPOP)
    return "spop";
  else
    return "unknown";
}

/* Convert <mode> string into proxy mode type. PR_MODES is returned for unknown values. */
enum pr_mode str_to_proxy_mode(const char *mode)
{
  if (strcmp(mode, "http") == 0)
    return PR_MODE_HTTP;
  else if (strcmp(mode, "tcp") == 0)
    return PR_MODE_TCP;
  else if (strcmp(mode, "log") == 0)
    return PR_MODE_SYSLOG;
  else if (strcmp(mode, "spop") == 0)
    return PR_MODE_SPOP;

  return PR_MODES;
}

/* try to find among known options the one that looks closest to <word> by
 * counting transitions between letters, digits and other characters. Will
 * return the best matching word if found, otherwise NULL. An optional array
 * of extra words to compare may be passed in <extra>, but it must then be
 * terminated by a NULL entry. If unused it may be NULL.
 */
const char *proxy_find_best_option(const char *word, const char **extra)
{
  uint8_t word_sig[1024];
  uint8_t list_sig[1024];
  const char *best_ptr = NULL;
  int dist, best_dist = INT_MAX;
  int index;

  make_word_fingerprint(word_sig, word);

  for (index = 0; cfg_opts[index].name; index++) {
    make_word_fingerprint(list_sig, cfg_opts[index].name);
    dist = word_fingerprint_distance(word_sig, list_sig);
    if (dist < best_dist) {
      best_dist = dist;
      best_ptr = cfg_opts[index].name;
    }
  }

  for (index = 0; cfg_opts2[index].name; index++) {
    make_word_fingerprint(list_sig, cfg_opts2[index].name);
    dist = word_fingerprint_distance(word_sig, list_sig);
    if (dist < best_dist) {
      best_dist = dist;
      best_ptr = cfg_opts2[index].name;
    }
  }

  while (extra && *extra) {
    make_word_fingerprint(list_sig, *extra);
    dist = word_fingerprint_distance(word_sig, list_sig);
    if (dist < best_dist) {
      best_dist = dist;
      best_ptr = *extra;
    }
    extra++;
  }

  if (best_dist > 2 * strlen(word) || (best_ptr && best_dist > 2 * strlen(best_ptr)))
    best_ptr = NULL;
  return best_ptr;
}

/* This function returns the first unused proxy ID greater than or equal to
 * <from> in used_proxy_id. Zero is returned if no spare one is found (should
 * never happen).
 */
uint proxy_get_next_id(uint from)
{
  const struct proxy *px;

  do {
    px = ceb32_item_lookup_ge(&used_proxy_id, conf.uuid_node, uuid, from, struct proxy);
    if (!px || px->uuid > from)
      return from; /* available */
    from++;
  } while (from);
  return from;
}

/* This function parses a "timeout" statement in a proxy section. It returns
 * -1 if there is any error, 1 for a warning, otherwise zero. If it does not
 * return zero, it will write an error or warning message into a preallocated
 * buffer returned at <err>. The trailing is not be written. The function must
 * be called with <args> pointing to the first command line word, with <proxy>
 * pointing to the proxy being parsed, and <defpx> to the default proxy or NULL.
 * As a special case for compatibility with older configs, it also accepts
 * "{cli|srv|con}timeout" in args[0].
 */
static int proxy_parse_timeout(char **args, int section, struct proxy *proxy,
                               const struct proxy *defpx, const char *file, int line,
                               char **err)
{
  unsigned timeout;
  int retval, cap;
  const char *res, *name;
  int *tv = NULL;
  const int *td = NULL;

  retval = 0;

  /* simply skip "timeout" but remain compatible with old form */
  if (strcmp(args[0], "timeout") == 0)
    args++;

  name = args[0];
  if (strcmp(args[0], "client") == 0) {
    name = "client";
    tv = &proxy->timeout.client;
    td = &defpx->timeout.client;
    cap = PR_CAP_FE;
  } else if (strcmp(args[0], "tarpit") == 0) {
    tv = &proxy->timeout.tarpit;
    td = &defpx->timeout.tarpit;
    cap = PR_CAP_FE | PR_CAP_BE;
  } else if (strcmp(args[0], "client-hs") == 0) {
    tv = &proxy->timeout.client_hs;
    td = &defpx->timeout.client_hs;
    cap = PR_CAP_FE;
  } else if (strcmp(args[0], "http-keep-alive") == 0) {
    tv = &proxy->timeout.httpka;
    td = &defpx->timeout.httpka;
    cap = PR_CAP_FE | PR_CAP_BE;
  } else if (strcmp(args[0], "http-request") == 0) {
    tv = &proxy->timeout.httpreq;
    td = &defpx->timeout.httpreq;
    cap = PR_CAP_FE | PR_CAP_BE;
  } else if (strcmp(args[0], "server") == 0) {
    name = "server";
    tv = &proxy->timeout.server;
    td = &defpx->timeout.server;
    cap = PR_CAP_BE;
  } else if (strcmp(args[0], "connect") == 0) {
    name = "connect";
    tv = &proxy->timeout.connect;
    td = &defpx->timeout.connect;
    cap = PR_CAP_BE;
  } else if (strcmp(args[0], "check") == 0) {
    tv = &proxy->timeout.check;
    td = &defpx->timeout.check;
    cap = PR_CAP_BE;
  } else if (strcmp(args[0], "queue") == 0) {
    tv = &proxy->timeout.queue;
    td = &defpx->timeout.queue;
    cap = PR_CAP_BE;
  } else if (strcmp(args[0], "tunnel") == 0) {
    tv = &proxy->timeout.tunnel;
    td = &defpx->timeout.tunnel;
    cap = PR_CAP_BE;
  } else if (strcmp(args[0], "client-fin") == 0) {
    tv = &proxy->timeout.clientfin;
    td = &defpx->timeout.clientfin;
    cap = PR_CAP_FE;
  } else if (strcmp(args[0], "server-fin") == 0) {
    tv = &proxy->timeout.serverfin;
    td = &defpx->timeout.serverfin;
    cap = PR_CAP_BE;
  } else if (strcmp(args[0], "clitimeout") == 0) {
    memprintf(err, "the '%s' directive is not supported anymore since HAProxy 2.1. Use 'timeout client'.", args[0]);
    return -1;
  } else if (strcmp(args[0], "srvtimeout") == 0) {
    memprintf(err, "the '%s' directive is not supported anymore since HAProxy 2.1. Use 'timeout server'.", args[0]);
    return -1;
  } else if (strcmp(args[0], "contimeout") == 0) {
    memprintf(err, "the '%s' directive is not supported anymore since HAProxy 2.1. Use 'timeout connect'.", args[0]);
    return -1;
  } else {
    memprintf(err,
              "'timeout' supports 'client', 'server', 'connect', 'check', "
              "'queue', 'handshake', 'http-keep-alive', 'http-request', 'tunnel', 'tarpit', "
        "'client-fin' and 'server-fin' (got '%s')",
              args[0]);
    return -1;
  }

  if (*args[1] == 0) {
    memprintf(err, "'timeout %s' expects an integer value (in milliseconds)", name);
    return -1;
  }

  res = parse_time_err(args[1], &timeout, TIME_UNIT_MS);
  if (res == PARSE_TIME_OVER) {
    memprintf(err, "timer overflow in argument '%s' to 'timeout %s' (maximum value is 2147483647 ms or ~24.8 days)",
        args[1], name);
    return -1;
  }
  else if (res == PARSE_TIME_UNDER) {
    memprintf(err, "timer underflow in argument '%s' to 'timeout %s' (minimum non-null value is 1 ms)",
        args[1], name);
    return -1;
  }
  else if (res) {
    memprintf(err, "unexpected character '%c' in 'timeout %s'", *res, name);
    return -1;
  }

  if (warn_if_lower(args[1], 100)) {
    memprintf(err, "'timeout %s %u' in %s '%s' is suspiciously small for a value in milliseconds. Please use an explicit unit ('%ums') if that was the intent.",
              name, timeout, proxy_type_str(proxy), proxy->id, timeout);
    retval = 1;
  }

  if (!(proxy->cap & cap)) {
    memprintf(err, "'timeout %s' will be ignored because %s '%s' has no %s capability",
              name, proxy_type_str(proxy), proxy->id,
              (cap & PR_CAP_BE) ? "backend" : "frontend");
    retval = 1;
  }
  else if (defpx && *tv != *td) {
    memprintf(err, "overwriting 'timeout %s' which was already specified", name);
    retval = 1;
  }

  if (*args[2] != 0) {
    memprintf(err, "'timeout %s' : unexpected extra argument '%s' after value '%s'.", name, args[2], args[1]);
    retval = -1;
  }

  *tv = MS_TO_TICKS(timeout);
  return retval;
}

/* This function parses a "rate-limit" statement in a proxy section. It returns
 * -1 if there is any error, 1 for a warning, otherwise zero. If it does not
 * return zero, it will write an error or warning message into a preallocated
 * buffer returned at <err>. The function must be called with <args> pointing
 * to the first command line word, with <proxy> pointing to the proxy being
 * parsed, and <defpx> to the default proxy or NULL.
 */
static int proxy_parse_rate_limit(char **args, int section, struct proxy *proxy,
                                  const struct proxy *defpx, const char *file, int line,
                                  char **err)
{
  int retval;
  char *res;
  unsigned int *tv = NULL;
  const unsigned int *td = NULL;
  unsigned int val;

  retval = 0;

  if (strcmp(args[1], "sessions") == 0) {
    tv = &proxy->fe_sps_lim;
    td = &defpx->fe_sps_lim;
  }
  else {
    memprintf(err, "'%s' only supports 'sessions' (got '%s')", args[0], args[1]);
    return -1;
  }

  if (*args[2] == 0) {
    memprintf(err, "'%s %s' expects expects an integer value (in sessions/second)", args[0], args[1]);
    return -1;
  }

  val = strtoul(args[2], &res, 0);
  if (*res) {
    memprintf(err, "'%s %s' : unexpected character '%c' in integer value '%s'", args[0], args[1], *res, args[2]);
    return -1;
  }

  if (!(proxy->cap & PR_CAP_FE)) {
    memprintf(err, "%s %s will be ignored because %s '%s' has no frontend capability",
        args[0], args[1], proxy_type_str(proxy), proxy->id);
    retval = 1;
  }
  else if (defpx && *tv != *td) {
    memprintf(err, "overwriting %s %s which was already specified", args[0], args[1]);
    retval = 1;
  }

  *tv = val;
  return retval;
}

/* This function parses a "max-keep-alive-queue" statement in a proxy section.
 * It returns -1 if there is any error, 1 for a warning, otherwise zero. If it
 * does not return zero, it will write an error or warning message into a
 * preallocated buffer returned at <err>. The function must be called with
 * <args> pointing to the first command line word, with <proxy> pointing to
 * the proxy being parsed, and <defpx> to the default proxy or NULL.
 */
static int proxy_parse_max_ka_queue(char **args, int section, struct proxy *proxy,
                                    const struct proxy *defpx, const char *file, int line,
                                    char **err)
{
  int retval;
  char *res;
  unsigned int val;

  retval = 0;

  if (*args[1] == 0) {
    memprintf(err, "'%s' expects expects an integer value (or -1 to disable)", args[0]);
    return -1;
  }

  val = strtol(args[1], &res, 0);
  if (*res) {
    memprintf(err, "'%s' : unexpected character '%c' in integer value '%s'", args[0], *res, args[1]);
    return -1;
  }

  if (!(proxy->cap & PR_CAP_BE)) {
    memprintf(err, "%s will be ignored because %s '%s' has no backend capability",
              args[0], proxy_type_str(proxy), proxy->id);
    retval = 1;
  }

  /* we store <val+1> so that a user-facing value of -1 is stored as zero (default) */
  proxy->max_ka_queue = val + 1;
  return retval;
}

/* This function parses a "declare" statement in a proxy section. It returns -1
 * if there is any error, 1 for warning, otherwise 0. If it does not return zero,
 * it will write an error or warning message into a preallocated buffer returned
 * at <err>. The function must be called with <args> pointing to the first command
 * line word, with <proxy> pointing to the proxy being parsed, and <defpx> to the
 * default proxy or NULL.
 */
static int proxy_parse_declare(char **args, int section, struct proxy *curpx,
                               const struct proxy *defpx, const char *file, int line,
                               char **err)
{
  /* Capture keyword wannot be declared in a default proxy. */
  if (curpx == defpx) {
    memprintf(err, "'%s' not available in default section", args[0]);
    return -1;
  }

  /* Capture keyword is only available in frontend. */
  if (!(curpx->cap & PR_CAP_FE)) {
    memprintf(err, "'%s' only available in frontend or listen section", args[0]);
    return -1;
  }

  /* Check mandatory second keyword. */
  if (!args[1] || !*args[1]) {
    memprintf(err, "'%s' needs a second keyword that specify the type of declaration ('capture')", args[0]);
    return -1;
  }

  /* Actually, declare is only available for declaring capture
   * slot, but in the future it can declare maps or variables.
   * So, this section permits to check and switch according with
   * the second keyword.
   */
  if (strcmp(args[1], "capture") == 0) {
    char *error = NULL;
    long len;
    struct cap_hdr *hdr;

    /* Check the next keyword. */
    if (!args[2] || !*args[2] ||
        (strcmp(args[2], "response") != 0 &&
         strcmp(args[2], "request") != 0)) {
      memprintf(err, "'%s %s' requires a direction ('request' or 'response')", args[0], args[1]);
      return -1;
    }

    /* Check the 'len' keyword. */
    if (!args[3] || !*args[3] || strcmp(args[3], "len") != 0) {
      memprintf(err, "'%s %s' requires a capture length ('len')", args[0], args[1]);
      return -1;
    }

    /* Check the length value. */
    if (!args[4] || !*args[4]) {
      memprintf(err, "'%s %s': 'len' requires a numeric value that represents the "
                     "capture length",
                args[0], args[1]);
      return -1;
    }

    /* convert the length value. */
    len = strtol(args[4], &error, 10);
    if (*error != '\0') {
      memprintf(err, "'%s %s': cannot parse the length '%s'.",
                args[0], args[1], args[4]);
      return -1;
    }

    /* check length. */
    if (len <= 0) {
      memprintf(err, "length must be > 0");
      return -1;
    }

    /* register the capture. */
    hdr = calloc(1, sizeof(*hdr));
    if (!hdr) {
      memprintf(err, "proxy '%s': out of memory while registering a capture", curpx->id);
      return -1;
    }
    hdr->name = NULL; /* not a header capture */
    hdr->namelen = 0;
    hdr->len = len;
    hdr->pool = create_pool("caphdr", hdr->len + 1, MEM_F_SHARED);
    if (!hdr->pool) {
      memprintf(err, "out of memory");
      free(hdr);
      return -1;
    }

    if (strcmp(args[2], "request") == 0) {
      hdr->next = curpx->req_cap;
      hdr->index = curpx->nb_req_cap++;
      curpx->req_cap = hdr;
    }
    if (strcmp(args[2], "response") == 0) {
      hdr->next = curpx->rsp_cap;
      hdr->index = curpx->nb_rsp_cap++;
      curpx->rsp_cap = hdr;
    }
    return 0;
  }
  else {
    memprintf(err, "unknown declaration type '%s' (supports 'capture')", args[1]);
    return -1;
  }
}

/* This function parses a "retry-on" statement */
static int
proxy_parse_retry_on(char **args, int section, struct proxy *curpx,
                               const struct proxy *defpx, const char *file, int line,
                               char **err)
{
  int i;

  if (!(*args[1])) {
    memprintf(err, "'%s' needs at least one keyword to specify when to retry", args[0]);
    return -1;
  }
  if (!(curpx->cap & PR_CAP_BE)) {
    memprintf(err, "'%s' only available in backend or listen section", args[0]);
    return -1;
  }
  curpx->retry_type = 0;
  for (i = 1; *(args[i]); i++) {
    if (strcmp(args[i], "conn-failure") == 0)
      curpx->retry_type |= PR_RE_CONN_FAILED;
    else if (strcmp(args[i], "empty-response") == 0)
      curpx->retry_type |= PR_RE_DISCONNECTED;
    else if (strcmp(args[i], "response-timeout") == 0)
      curpx->retry_type |= PR_RE_TIMEOUT;
    else if (strcmp(args[i], "401") == 0)
      curpx->retry_type |= PR_RE_401;
    else if (strcmp(args[i], "403") == 0)
      curpx->retry_type |= PR_RE_403;
    else if (strcmp(args[i], "404") == 0)
      curpx->retry_type |= PR_RE_404;
    else if (strcmp(args[i], "408") == 0)
      curpx->retry_type |= PR_RE_408;
    else if (strcmp(args[i], "421") == 0)
      curpx->retry_type |= PR_RE_421;
    else if (strcmp(args[i], "425") == 0)
      curpx->retry_type |= PR_RE_425;
    else if (strcmp(args[i], "429") == 0)
      curpx->retry_type |= PR_RE_429;
    else if (strcmp(args[i], "500") == 0)
      curpx->retry_type |= PR_RE_500;
    else if (strcmp(args[i], "501") == 0)
      curpx->retry_type |= PR_RE_501;
    else if (strcmp(args[i], "502") == 0)
      curpx->retry_type |= PR_RE_502;
    else if (strcmp(args[i], "503") == 0)
      curpx->retry_type |= PR_RE_503;
    else if (strcmp(args[i], "504") == 0)
      curpx->retry_type |= PR_RE_504;
    else if (strcmp(args[i], "0rtt-rejected") == 0)
      curpx->retry_type |= PR_RE_EARLY_ERROR;
    else if (strcmp(args[i], "junk-response") == 0)
      curpx->retry_type |= PR_RE_JUNK_REQUEST;
    else if (!(strcmp(args[i], "all-retryable-errors")))
      curpx->retry_type |= PR_RE_CONN_FAILED | PR_RE_DISCONNECTED |
                           PR_RE_TIMEOUT | PR_RE_500 | PR_RE_502 |
               PR_RE_503 | PR_RE_504 | PR_RE_EARLY_ERROR |
               PR_RE_JUNK_REQUEST;
    else if (strcmp(args[i], "none") == 0) {
      if (i != 1 || *args[i + 1]) {
        memprintf(err, "'%s' 'none' keyword only usable alone", args[0]);
        return -1;
      }
    } else {
      memprintf(err, "'%s': unknown keyword '%s'", args[0], args[i]);
      return -1;
    }

  }


  return 0;
}

/* This function parses a "hash-preserve-affinity" statement */
static int
proxy_parse_hash_preserve_affinity(char **args, int section, struct proxy *curpx,
                  const struct proxy *defpx, const char *file, int line,
                  char **err)
{
  if (!(*args[1])) {
    memprintf(err, "'%s' needs a keyword to specify when to preserve hash affinity", args[0]);
    return -1;
  }
  if (!(curpx->cap & PR_CAP_BE)) {
    memprintf(err, "'%s' only available in backend or listen section", args[0]);
    return -1;
  }

  curpx->options3 &= ~PR_O3_HASHAFNTY_MASK;

  if (strcmp(args[1], "always") == 0)
    curpx->options3 |= PR_O3_HASHAFNTY_ALWS;
  else if (strcmp(args[1], "maxconn") == 0)
    curpx->options3 |= PR_O3_HASHAFNTY_MAXCONN;
  else if (strcmp(args[1], "maxqueue") == 0)
    curpx->options3 |= PR_O3_HASHAFNTY_MAXQUEUE;
  else {
    memprintf(err, "'%s': unknown keyword '%s'", args[0], args[1]);
    return -1;
  }

  return 0;
}

#ifdef TCP_KEEPCNT
/* This function parses "{cli|srv}tcpka-cnt" statements */
static int proxy_parse_tcpka_cnt(char **args, int section, struct proxy *proxy,
                                    const struct proxy *defpx, const char *file, int line,
                                    char **err)
{
  int retval;
  char *res;
  unsigned int tcpka_cnt;

  retval = 0;

  if (*args[1] == 0) {
    memprintf(err, "'%s' expects an integer value", args[0]);
    return -1;
  }

  tcpka_cnt = strtol(args[1], &res, 0);
  if (*res) {
    memprintf(err, "'%s' : unexpected character '%c' in integer value '%s'", args[0], *res, args[1]);
    return -1;
  }

  if (strcmp(args[0], "clitcpka-cnt") == 0) {
    if (!(proxy->cap & PR_CAP_FE)) {
      memprintf(err, "%s will be ignored because %s '%s' has no frontend capability",
                args[0], proxy_type_str(proxy), proxy->id);
      retval = 1;
    }
    proxy->clitcpka_cnt = tcpka_cnt;
  } else if (strcmp(args[0], "srvtcpka-cnt") == 0) {
    if (!(proxy->cap & PR_CAP_BE)) {
      memprintf(err, "%s will be ignored because %s '%s' has no backend capability",
                args[0], proxy_type_str(proxy), proxy->id);
      retval = 1;
    }
    proxy->srvtcpka_cnt = tcpka_cnt;
  } else {
    /* unreachable */
    memprintf(err, "'%s': unknown keyword", args[0]);
    return -1;
  }

  return retval;
}
#endif

#ifdef TCP_KEEPIDLE
/* This function parses "{cli|srv}tcpka-idle" statements */
static int proxy_parse_tcpka_idle(char **args, int section, struct proxy *proxy,
                                  const struct proxy *defpx, const char *file, int line,
                                  char **err)
{
  int retval;
  const char *res;
  unsigned int tcpka_idle;

  retval = 0;

  if (*args[1] == 0) {
    memprintf(err, "'%s' expects an integer value", args[0]);
    return -1;
  }
  res = parse_time_err(args[1], &tcpka_idle, TIME_UNIT_S);
  if (res == PARSE_TIME_OVER) {
    memprintf(err, "timer overflow in argument '%s' to '%s' (maximum value is 2147483647 ms or ~24.8 days)",
        args[1], args[0]);
    return -1;
  }
  else if (res == PARSE_TIME_UNDER) {
    memprintf(err, "timer underflow in argument '%s' to '%s' (minimum non-null value is 1 ms)",
        args[1], args[0]);
    return -1;
  }
  else if (res) {
    memprintf(err, "unexpected character '%c' in argument to <%s>.\n", *res, args[0]);
    return -1;
  }

  if (strcmp(args[0], "clitcpka-idle") == 0) {
    if (!(proxy->cap & PR_CAP_FE)) {
      memprintf(err, "%s will be ignored because %s '%s' has no frontend capability",
                args[0], proxy_type_str(proxy), proxy->id);
      retval = 1;
    }
    proxy->clitcpka_idle = tcpka_idle;
  } else if (strcmp(args[0], "srvtcpka-idle") == 0) {
    if (!(proxy->cap & PR_CAP_BE)) {
      memprintf(err, "%s will be ignored because %s '%s' has no backend capability",
                args[0], proxy_type_str(proxy), proxy->id);
      retval = 1;
    }
    proxy->srvtcpka_idle = tcpka_idle;
  } else {
    /* unreachable */
    memprintf(err, "'%s': unknown keyword", args[0]);
    return -1;
  }

  return retval;
}
#endif

#ifdef TCP_KEEPINTVL
/* This function parses "{cli|srv}tcpka-intvl" statements */
static int proxy_parse_tcpka_intvl(char **args, int section, struct proxy *proxy,
                       const struct proxy *defpx, const char *file, int line,
                                   char **err)
{
  int retval;
  const char *res;
  unsigned int tcpka_intvl;

  retval = 0;

  if (*args[1] == 0) {
    memprintf(err, "'%s' expects an integer value", args[0]);
    return -1;
  }
  res = parse_time_err(args[1], &tcpka_intvl, TIME_UNIT_S);
  if (res == PARSE_TIME_OVER) {
    memprintf(err, "timer overflow in argument '%s' to '%s' (maximum value is 2147483647 ms or ~24.8 days)",
        args[1], args[0]);
    return -1;
  }
  else if (res == PARSE_TIME_UNDER) {
    memprintf(err, "timer underflow in argument '%s' to '%s' (minimum non-null value is 1 ms)",
        args[1], args[0]);
    return -1;
  }
  else if (res) {
    memprintf(err, "unexpected character '%c' in argument to <%s>.\n", *res, args[0]);
    return -1;
  }

  if (strcmp(args[0], "clitcpka-intvl") == 0) {
    if (!(proxy->cap & PR_CAP_FE)) {
      memprintf(err, "%s will be ignored because %s '%s' has no frontend capability",
                args[0], proxy_type_str(proxy), proxy->id);
      retval = 1;
    }
    proxy->clitcpka_intvl = tcpka_intvl;
  } else if (strcmp(args[0], "srvtcpka-intvl") == 0) {
    if (!(proxy->cap & PR_CAP_BE)) {
      memprintf(err, "%s will be ignored because %s '%s' has no backend capability",
                args[0], proxy_type_str(proxy), proxy->id);
      retval = 1;
    }
    proxy->srvtcpka_intvl = tcpka_intvl;
  } else {
    /* unreachable */
    memprintf(err, "'%s': unknown keyword", args[0]);
    return -1;
  }

  return retval;
}
#endif

/* Parser for "be-unpublished" proxy keyword. */
static int proxy_parse_be_unpublished(char **args, int section_type, struct proxy *curpx,
                                      const struct proxy *defpx, const char *file, int line,
                                      char **err)
{
  if (curpx->cap & PR_CAP_DEF) {
    memprintf(err, "'%s' not allowed in 'defaults' section.", args[0]);
    goto err;
  }

  if (!(curpx->cap & PR_CAP_BE)) {
    memprintf(err, "'%s' only available in backend or listen section.", args[0]);
    goto err;
  }

  curpx->flags |= PR_FL_BE_UNPUBLISHED;

  return 0;

 err:
  return -1;
}

static int proxy_parse_force_be_switch(char **args, int section_type, struct proxy *curpx,
                                       const struct proxy *defpx, const char *file, int line,
                                       char **err)
{
  struct acl_cond *cond = NULL;
  struct persist_rule *rule;

  if (curpx->cap & PR_CAP_DEF) {
    memprintf(err, "'%s' not allowed in 'defaults' section.", args[0]);
    goto err;
  }

  if (!(curpx->cap & PR_CAP_FE)) {
    memprintf(err, "'%s' only available in frontend or listen section.", args[0]);
    goto err;
  }

  if (strcmp(args[1], "if") != 0 && strcmp(args[1], "unless") != 0) {
    memprintf(err, "'%s' requires either 'if' or 'unless' followed by a condition.", args[0]);
    goto err;
  }

  if (!(cond = build_acl_cond(file, line, &curpx->acl, curpx, (const char **)args + 1, err))) {
    memprintf(err, "'%s' : %s.", args[0], *err);
    goto err;
  }

  if (warnif_cond_conflicts(cond, SMP_VAL_FE_REQ_CNT, err)) {
    memprintf(err, "'%s' : %s.", args[0], *err);
    goto err;
  }

  rule = calloc(1, sizeof(*rule));
  if (!rule) {
    memprintf(err, "'%s' : out of memory.", args[0]);
    goto err;
  }

  rule->cond = cond;
  rule->type = PERSIST_TYPE_BE_SWITCH;
  LIST_INIT(&rule->list);
  LIST_APPEND(&curpx->persist_rules, &rule->list);

  return 0;

 err:
  free_acl_cond(cond);
  return -1;
}

static int proxy_parse_guid(char **args, int section_type, struct proxy *curpx,
                            const struct proxy *defpx, const char *file, int line,
                            char **err)
{
  const char *guid;
  char *guid_err = NULL;

  if (curpx->cap & PR_CAP_DEF) {
    ha_alert("parsing [%s:%d] : '%s' not allowed in 'defaults' section.\n", file, line, args[0]);
    return -1;
  }

  if (!*args[1]) {
    memprintf(err, "'%s' : expects an argument", args[0]);
    return -1;
  }

  guid = args[1];
  if (guid_insert(&curpx->obj_type, guid, &guid_err)) {
    memprintf(err, "'%s': %s", args[0], guid_err);
    ha_free(&guid_err);
    return -1;
  }

  return 0;
}

/* This function inserts proxy <px> into the tree of known proxies (regular
 * ones or defaults depending on px->cap & PR_CAP_DEF). The proxy's name is
 * used as the storing key so it must already have been initialized.
 */
void proxy_store_name(struct proxy *px)
{
  struct ceb_root **root = (px->cap & PR_CAP_DEF) ? &defproxy_by_name : &proxy_by_name;

  cebis_item_insert(root, conf.name_node, id, px);
}

/* Returns a pointer to the first proxy matching capabilities <cap> and id
 * <id>. NULL is returned if no match is found. If <table> is non-zero, it
 * only considers proxies having a table.
 */
struct proxy *proxy_find_by_id(int id, int cap, int table)
{
  struct proxy *px;

  for (px = ceb32_item_lookup(&used_proxy_id, conf.uuid_node, uuid, id, struct proxy);
       px ; px = ceb32_item_next_dup(&used_proxy_id, conf.uuid_node, uuid, px)) {
    if ((px->cap & cap) != cap)
      continue;

    if (table && (!px->table || !px->table->size))
      continue;

    return px;
  }
  return NULL;
}

/* Returns a pointer to the first proxy matching either name <name>, or id
 * <name> if <name> begins with a '#'. NULL is returned if no match is found.
 * If <table> is non-zero, it only considers proxies having a table. The search
 * is made into the regular proxies, unless <cap> has PR_CAP_DEF set in which
 * case it's searched into the defproxy tree.
 */
struct proxy *proxy_find_by_name(const char *name, int cap, int table)
{
  struct proxy *curproxy;

  if (*name == '#' && !(cap & PR_CAP_DEF)) {
    curproxy = proxy_find_by_id(atoi(name + 1), cap, table);
    if (curproxy)
      return curproxy;
  }
  else {
    struct ceb_root **root;

    root = (cap & PR_CAP_DEF) ? &defproxy_by_name : &proxy_by_name;
    for (curproxy = cebis_item_lookup(root, conf.name_node, id, name, struct proxy);
         curproxy; curproxy = cebis_item_next_dup(root, conf.name_node, id, curproxy)) {
      if ((curproxy->cap & cap) != cap)
        continue;

      if (table && (!curproxy->table || !curproxy->table->size))
        continue;

      return curproxy;
    }
  }
  return NULL;
}

/* Finds the best match for a proxy with capabilities <cap>, name <name> and id
 * <id>. At most one of <id> or <name> may be different provided that <cap> is
 * valid. Either <id> or <name> may be left unspecified (0). The purpose is to
 * find a proxy based on some information from a previous configuration, across
 * reloads or during information exchange between peers.
 *
 * Names are looked up first if present, then IDs are compared if present. In
 * case of an inexact match whatever is forced in the configuration has
 * precedence in the following order :
 *   - 1) forced ID (proves a renaming / change of proxy type)
 *   - 2) proxy name+type (may indicate a move if ID differs)
 *   - 3) automatic ID+type (may indicate a renaming)
 *
 * Depending on what is found, we can end up in the following situations :
 *
 *   name id cap  | possible causes
 *   -------------+-----------------
 *    --  --  --  | nothing found
 *    --  --  ok  | nothing found
 *    --  ok  --  | proxy deleted, ID points to next one
 *    --  ok  ok  | proxy renamed, or deleted with ID pointing to next one
 *    ok  --  --  | proxy deleted, but other half with same name still here (before)
 *    ok  --  ok  | proxy's ID changed (proxy moved in the config file)
 *    ok  ok  --  | proxy deleted, but other half with same name still here (after)
 *    ok  ok  ok  | perfect match
 *
 * Upon return if <diff> is not NULL, it is zeroed then filled with up to 3 bits :
 *   - PR_FBM_MISMATCH_ID        : proxy was found but ID differs
 *                                 (and ID was not zero)
 *   - PR_FBM_MISMATCH_NAME      : proxy was found by ID but name differs
 *                                 (and name was not NULL)
 *   - PR_FBM_MISMATCH_PROXYTYPE : a proxy of different type was found with
 *                                 the same name and/or id
 *
 * Only a valid proxy is returned. If capabilities do not match, NULL is
 * returned. The caller can check <diff> to report detailed warnings / errors,
 * and decide whether or not to use what was found.
 */
struct proxy *proxy_find_best_match(int cap, const char *name, int id, int *diff)
{
  struct proxy *byname;
  struct proxy *byid;

  if (!name && !id)
    return NULL;

  if (diff)
    *diff = 0;

  byname = byid = NULL;

  if (name) {
    byname = proxy_find_by_name(name, cap, 0);
    if (byname && (!id || byname->uuid == id))
      return byname;
  }

  /* remaining possibilities :
   *   - name not set
   *   - name set but not found
   *   - name found, but ID doesn't match.
   */
  if (id) {
    byid = proxy_find_by_id(id, cap, 0);
    if (byid) {
      if (byname) {
        /* id+type found, name+type found, but not all 3.
         * ID wins only if forced, otherwise name wins.
         */
        if (byid->options & PR_O_FORCED_ID) {
          if (diff)
            *diff |= PR_FBM_MISMATCH_NAME;
          return byid;
        }
        else {
          if (diff)
            *diff |= PR_FBM_MISMATCH_ID;
          return byname;
        }
      }

      /* remaining possibilities :
       *   - name not set
       *   - name set but not found
       */
      if (name && diff)
        *diff |= PR_FBM_MISMATCH_NAME;
      return byid;
    }

    /* ID not found */
    if (byname) {
      if (diff)
        *diff |= PR_FBM_MISMATCH_ID;
      return byname;
    }
  }

  /* All remaining possibilities will lead to NULL. If we can report more
   * detailed information to the caller about changed types and/or name,
   * we'll do it. For example, we could detect that "listen foo" was
   * split into "frontend foo_ft" and "backend foo_bk" if IDs are forced.
   *   - name not set, ID not found
   *   - name not found, ID not set
   *   - name not found, ID not found
   */
  if (!diff)
    return NULL;

  if (name) {
    byname = proxy_find_by_name(name, 0, 0);
    if (byname && (!id || byname->uuid == id))
      *diff |= PR_FBM_MISMATCH_PROXYTYPE;
  }

  if (id) {
    byid = proxy_find_by_id(id, 0, 0);
    if (byid) {
      if (!name)
        *diff |= PR_FBM_MISMATCH_PROXYTYPE; /* only type changed */
      else if (byid->options & PR_O_FORCED_ID)
        *diff |= PR_FBM_MISMATCH_NAME | PR_FBM_MISMATCH_PROXYTYPE; /* name and type changed */
      /* otherwise it's a different proxy that was returned */
    }
  }
  return NULL;
}

/* This function checks that the designated proxy has no http directives
 * enabled. It will output a warning if there are, and will fix some of them.
 * It returns the number of fatal errors encountered. This should be called
 * at the end of the configuration parsing if the proxy is not in http mode.
 * The <file> argument is used to construct the error message.
 */
int proxy_cfg_ensure_no_http(struct proxy *curproxy)
{
  if (curproxy->cookie_name != NULL) {
    ha_warning("cookie will be ignored for %s '%s' (needs 'mode http').\n",
         proxy_type_str(curproxy), curproxy->id);
  }
  if (curproxy->lbprm.algo & BE_LB_NEED_HTTP) {
    curproxy->lbprm.algo &= ~BE_LB_ALGO;
    curproxy->lbprm.algo |= BE_LB_ALGO_RR;
    ha_warning("Layer 7 hash not possible for %s '%s' (needs 'mode http'). Falling back to round robin.\n",
         proxy_type_str(curproxy), curproxy->id);
  }
  if (curproxy->logformat.str == default_http_log_format) {
    /* Note: we don't change the directive's file:line number */
    curproxy->logformat.str = default_tcp_log_format;
    ha_warning("parsing [%s:%d] : 'option httplog' not usable with %s '%s' (needs 'mode http'). Falling back to 'option tcplog'.\n",
         curproxy->logformat.conf.file, curproxy->logformat.conf.line,
         proxy_type_str(curproxy), curproxy->id);
  }
  else if (curproxy->logformat.str == clf_http_log_format) {
    /* Note: we don't change the directive's file:line number */
    curproxy->logformat.str = clf_tcp_log_format;
    ha_warning("parsing [%s:%d] : 'option httplog clf' not usable with %s '%s' (needs 'mode http'). Falling back to 'option tcplog clf'.\n",
         curproxy->logformat.conf.file, curproxy->logformat.conf.line,
         proxy_type_str(curproxy), curproxy->id);
  }
  else if (curproxy->logformat.str == default_https_log_format) {
    /* Note: we don't change the directive's file:line number */
    curproxy->logformat.str = default_tcp_log_format;
    ha_warning("parsing [%s:%d] : 'option httpslog' not usable with %s '%s' (needs 'mode http'). Falling back to 'option tcplog'.\n",
         curproxy->logformat.conf.file, curproxy->logformat.conf.line,
         proxy_type_str(curproxy), curproxy->id);
  }

  return 0;
}

/* This function checks that the designated proxy has no log directives
 * enabled. It will output a warning if there are, and will fix some of them.
 * It returns the number of fatal errors encountered. This should be called
 * at the end of the configuration parsing if the proxy is not in log mode.
 * The <file> argument is used to construct the error message.
 */
int proxy_cfg_ensure_no_log(struct proxy *curproxy)
{
  if (curproxy->lbprm.algo & BE_LB_NEED_LOG) {
    curproxy->lbprm.algo &= ~BE_LB_ALGO;
    curproxy->lbprm.algo |= BE_LB_ALGO_RR;
    ha_warning("Unusable balance algorithm for %s '%s' (needs 'mode log'). Falling back to round robin.\n",
         proxy_type_str(curproxy), curproxy->id);
  }

  return 0;
}

/* Perform the most basic initialization of <p> proxy and define some common
 * default parameters values. Any new proxy or peer should be initialized via
 * this function.
 */
void init_new_proxy(struct proxy *p)
{
  memset(p, 0, sizeof(struct proxy));
  p->obj_type = OBJ_TYPE_PROXY;
  LIST_INIT(&p->global_list);
  LIST_INIT(&p->servers);
  LIST_INIT(&p->el);
  LIST_INIT(&p->acl);
  LIST_INIT(&p->http_req_rules);
  LIST_INIT(&p->http_res_rules);
  LIST_INIT(&p->http_after_res_rules);
  LIST_INIT(&p->redirect_rules);
  LIST_INIT(&p->mon_fail_cond);
  LIST_INIT(&p->switching_rules);
  LIST_INIT(&p->server_rules);
  LIST_INIT(&p->persist_rules);
  LIST_INIT(&p->sticking_rules);
  LIST_INIT(&p->storersp_rules);
  LIST_INIT(&p->tcp_req.inspect_rules);
  LIST_INIT(&p->tcp_rep.inspect_rules);
  LIST_INIT(&p->tcp_req.l4_rules);
  LIST_INIT(&p->tcp_req.l5_rules);
#ifdef USE_QUIC
  LIST_INIT(&p->quic_init_rules);
#endif
  MT_LIST_INIT(&p->listener_queue);
  LIST_INIT(&p->loggers);
  LIST_INIT(&p->conf.bind);
  LIST_INIT(&p->conf.listeners);
  LIST_INIT(&p->conf.errors);
  LIST_INIT(&p->conf.args.list);
  LIST_INIT(&p->conf.lf_checks);
  LIST_INIT(&p->filter_configs);
  LIST_INIT(&p->tcpcheck.preset_vars);
  LIST_INIT(&p->filter_sequence.req);
  LIST_INIT(&p->filter_sequence.res);

  MT_LIST_INIT(&p->lbprm.lb_free_list);

  p->conf.used_listener_id = NULL;
  p->conf.used_server_id   = NULL;
  p->used_server_addr      = NULL;

  /* Timeouts are defined as -1 */
  proxy_reset_timeouts(p);
  p->tcp_rep.inspect_delay = TICK_ETERNITY;

  /* initial uuid is unassigned (-1) */
  p->uuid = -1;

  /* Default to only allow L4 retries */
  p->retry_type = PR_RE_CONN_FAILED;

  p->stream_new_from_sc = stream_new;
  guid_init(&p->guid);
  MT_LIST_INIT(&p->watcher_list);

  p->extra_counters_fe = NULL;
  p->extra_counters_be = NULL;

  HA_RWLOCK_INIT(&p->lock);

  lf_expr_init(&p->logformat);
  lf_expr_init(&p->logformat_sd);
  lf_expr_init(&p->format_unique_id);
  lf_expr_init(&p->logformat_error);

  /* initialize parameters to common default values */
  p->mode = PR_MODE_TCP;
  p->options |= PR_O_REUSE_SAFE;
  p->max_out_conns = MAX_SRV_LIST;
  p->email_alert.level = LOG_ALERT;
  p->load_server_state_from_file = PR_SRV_STATE_FILE_UNSPEC;

  if (!(p->cap & PR_CAP_INT)) {
    p->maxconn = cfg_maxpconn;
    p->conn_retries = CONN_RETRIES;
  }
  else {
    p->options2 |= PR_O2_INDEPSTR;
    p->timeout.connect = 5000;
  }
}

/* Initialize per-thread proxy fields */
int proxy_init_per_thr(struct proxy *px)
{
  int i;

  px->per_tgrp = ha_aligned_zalloc_typed(global.nbtgroups, typeof(*px->per_tgrp));
  for (i = 0; i < global.nbtgroups; i++)
    queue_init(&px->per_tgrp[i].queue, px, NULL);

  return 0;
}

int proxy_finalize(struct proxy *px, int *err_code)
{
  struct list tmp_list = LIST_HEAD_INIT(tmp_list);
  struct bind_conf *bind_conf;
  struct server *newsrv;
  struct switching_rule *rule;
  struct server_rule *srule;
  struct sticking_rule *mrule;
  struct logger *tmplogger;
  struct lb_ops *ops;
  unsigned int next_id;
  int cfgerr = 0;
  char *err = NULL;
  int i;

  /* check and reduce the bind-proc of each listener */
  list_for_each_entry(bind_conf, &px->conf.bind, by_fe) {
    int mode = conn_pr_mode_to_proto_mode(px->mode);
    const struct mux_proto_list *mux_ent;
    int ret;

    /* Check the mux protocols, if any; before the check the ALPN */
    if (bind_conf->xprt && bind_conf->xprt == xprt_get(XPRT_QUIC)) {
      if (!bind_conf->mux_proto) {
        /* No protocol was specified. If we're using QUIC at the transport
         * layer, we'll instantiate it as a mux as well. If QUIC is not
         * compiled in, this will remain NULL.
         */
        bind_conf->mux_proto = get_mux_proto(ist("quic"));
      }
      if (bind_conf->options & BC_O_ACC_PROXY) {
        ha_alert("Binding [%s:%d] for %s %s: QUIC protocol does not support PROXY protocol yet."
                 " 'accept-proxy' option cannot be used with a QUIC listener.\n",
                 bind_conf->file, bind_conf->line,
                 proxy_type_str(px), px->id);
        cfgerr++;
      }
    }

    if (bind_conf->mux_proto) {
      int is_quic;

      if ((bind_conf->options & (BC_O_USE_SOCK_DGRAM | BC_O_USE_XPRT_STREAM)) == (BC_O_USE_SOCK_DGRAM | BC_O_USE_XPRT_STREAM))
        is_quic = 1;
      else
        is_quic = 0;
      /* it is possible that an incorrect mux was referenced
       * due to the proxy's mode not being taken into account
       * on first pass. Let's adjust it now.
       */
      mux_ent = conn_get_best_mux_entry(bind_conf->mux_proto->mux_proto, IST_NULL, PROTO_SIDE_FE, is_quic, mode);

      if (!mux_ent || !isteq(mux_ent->mux_proto, bind_conf->mux_proto->mux_proto)) {
        ha_alert("%s '%s' : MUX protocol '%.*s' is not usable for 'bind %s' at [%s:%d].\n",
                 proxy_type_str(px), px->id,
                 (int)bind_conf->mux_proto->mux_proto.len,
                 bind_conf->mux_proto->mux_proto.ptr,
                 bind_conf->arg, bind_conf->file, bind_conf->line);
        cfgerr++;
      }
      else {
        if ((mux_ent->mux->flags & MX_FL_FRAMED) && !(bind_conf->options & BC_O_USE_SOCK_DGRAM)) {
          ha_alert("%s '%s' : frame-based MUX protocol '%.*s' is incompatible with stream transport of 'bind %s' at [%s:%d].\n",
                   proxy_type_str(px), px->id,
                   (int)bind_conf->mux_proto->mux_proto.len,
                   bind_conf->mux_proto->mux_proto.ptr,
                   bind_conf->arg, bind_conf->file, bind_conf->line);
          cfgerr++;
        }
        else if (!(mux_ent->mux->flags & MX_FL_FRAMED) && !(bind_conf->options & BC_O_USE_SOCK_STREAM)) {
          ha_alert("%s '%s' : stream-based MUX protocol '%.*s' is incompatible with framed transport of 'bind %s' at [%s:%d].\n",
                   proxy_type_str(px), px->id,
                   (int)bind_conf->mux_proto->mux_proto.len,
                   bind_conf->mux_proto->mux_proto.ptr,
                   bind_conf->arg, bind_conf->file, bind_conf->line);
          cfgerr++;
        }
      }

      /* update the mux */
      bind_conf->mux_proto = mux_ent;
    }


    /* HTTP frontends with "h2" as ALPN/NPN will work in
     * HTTP/2 and absolutely require buffers 16kB or larger.
     */
#ifdef USE_OPENSSL
    /* no-alpn ? If so, it's the right moment to remove it */
    if (bind_conf->ssl_conf.alpn_str && !bind_conf->ssl_conf.alpn_len) {
      ha_free(&bind_conf->ssl_conf.alpn_str);
    }
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
    else if (!bind_conf->ssl_conf.alpn_str && !bind_conf->ssl_conf.npn_str &&
       ((bind_conf->options & BC_O_USE_SSL) || bind_conf->xprt == xprt_get(XPRT_QUIC)) &&
       px->mode == PR_MODE_HTTP && global.tune.bufsize >= 16384) {

      /* Neither ALPN nor NPN were explicitly set nor disabled, we're
       * in HTTP mode with an SSL or QUIC listener, we can enable ALPN.
       * Note that it's in binary form. First we try to set the ALPN from
       * mux proto if set. Otherwise rely on the default ALPN.
       */
      if (bind_conf->mux_proto && bind_conf->mux_proto->alpn)
        bind_conf->ssl_conf.alpn_str = strdup(bind_conf->mux_proto->alpn);
      else if (bind_conf->xprt == xprt_get(XPRT_QUIC))
        bind_conf->ssl_conf.alpn_str = strdup("\002h3");
      else
        bind_conf->ssl_conf.alpn_str = strdup("\002h2\010http/1.1");

      if (!bind_conf->ssl_conf.alpn_str) {
        ha_alert("Proxy '%s': out of memory while trying to allocate a default alpn string in 'bind %s' at [%s:%d].\n",
                 px->id, bind_conf->arg, bind_conf->file, bind_conf->line);
        cfgerr++;
        *err_code |= ERR_FATAL | ERR_ALERT;
        goto out;
      }
      bind_conf->ssl_conf.alpn_len = strlen(bind_conf->ssl_conf.alpn_str);
    }
#endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */


    if (px->mode == PR_MODE_HTTP && global.tune.bufsize < 16384) {
#ifdef OPENSSL_NPN_NEGOTIATED
      /* check NPN */
      if (bind_conf->ssl_conf.npn_str && strstr(bind_conf->ssl_conf.npn_str, "\002h2")) {
        ha_alert("HTTP frontend '%s' enables HTTP/2 via NPN at [%s:%d], so global.tune.bufsize must be at least 16384 bytes (%d now).\n",
                 px->id, bind_conf->file, bind_conf->line, global.tune.bufsize);
        cfgerr++;
      }
#endif /* OPENSSL_NPN_NEGOTIATED */
#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
      /* check ALPN */
      if (bind_conf->ssl_conf.alpn_str && strstr(bind_conf->ssl_conf.alpn_str, "\002h2")) {
        ha_alert("HTTP frontend '%s' enables HTTP/2 via ALPN at [%s:%d], so global.tune.bufsize must be at least 16384 bytes (%d now).\n",
                 px->id, bind_conf->file, bind_conf->line, global.tune.bufsize);
        cfgerr++;
      }
#endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */
    } /* HTTP && bufsize < 16384 */

#ifdef TLSEXT_TYPE_application_layer_protocol_negotiation
    if (px->mode == PR_MODE_HTTP && !bind_conf->mux_proto &&
        bind_conf->ssl_conf.alpn_str &&
        strstr(bind_conf->ssl_conf.alpn_str, "\002h3")) {
      if (!experimental_directives_allowed) {
        ha_alert("HTTP/3 on TCP listed via ALPN on frontend '%s' at [%s:%d] relies on the experimental QMux protocol, "
                 "must be allowed via a global 'expose-experimental-directives'.\n",
                 px->id, bind_conf->file, bind_conf->line);
        cfgerr++;
      }

      mark_tainted(TAINTED_CONFIG_EXP_KW_DECLARED);
    }
#endif /* TLSEXT_TYPE_application_layer_protocol_negotiation */

#endif /* USE_OPENSSL */

#ifdef USE_QUIC
    if (bind_conf->xprt == xprt_get(XPRT_QUIC)) {
      const struct quic_cc_algo *cc_algo = bind_conf->quic_cc_algo ?
        bind_conf->quic_cc_algo : default_quic_cc_algo;

      if (!(cc_algo->flags & QUIC_CC_ALGO_FL_OPT_PACING) &&
          !(quic_tune.fe.fb_opts & QUIC_TUNE_FB_TX_PACING)) {
        ha_warning("Binding [%s:%d] for %s %s: using the selected congestion algorithm without pacing may cause slowdowns or high loss rates during transfers.\n",
                   bind_conf->file, bind_conf->line,
                   proxy_type_str(px), px->id);
        *err_code |= ERR_WARN;
      }

      if (bind_conf->ssl_conf.early_data && conn_calc_max_streams(1)) {
        ha_notice("Binding [%s:%d] for %s %s: "
                  "stream elasticity is ignored for initial connection settings as this is incompatible with 0-RTT.",
                   bind_conf->file, bind_conf->line,
                   proxy_type_str(px), px->id);
      }
    }
#endif /* USE_QUIC */

    /* finish the bind setup */
    ret = bind_complete_thread_setup(bind_conf, err_code);
    if (ret != 0) {
      cfgerr += ret;
      if (*err_code & ERR_FATAL)
        goto out;
    }

    if (bind_generate_guid(bind_conf)) {
      cfgerr++;
      *err_code |= ERR_FATAL | ERR_ALERT;
      goto out;
    }
  }

  switch (px->mode) {
  case PR_MODE_TCP:
    cfgerr += proxy_cfg_ensure_no_http(px);
    cfgerr += proxy_cfg_ensure_no_log(px);
    break;

  case PR_MODE_HTTP:
    cfgerr += proxy_cfg_ensure_no_log(px);
    px->http_needed = 1;
    break;

  case PR_MODE_CLI:
    cfgerr += proxy_cfg_ensure_no_http(px);
    cfgerr += proxy_cfg_ensure_no_log(px);
    break;

  case PR_MODE_SYSLOG:
    /* this mode is initialized as the classic tcp proxy */
    cfgerr += proxy_cfg_ensure_no_http(px);
    break;

  case PR_MODE_SPOP:
    cfgerr += proxy_cfg_ensure_no_http(px);
    cfgerr += proxy_cfg_ensure_no_log(px);
    break;

  case PR_MODE_PEERS:
  case PR_MODES:
    /* should not happen, bug gcc warn missing switch statement */
    ha_alert("%s '%s' cannot initialize this proxy mode (peers) in this way. NOTE: PLEASE REPORT THIS TO DEVELOPERS AS YOU'RE NOT SUPPOSED TO BE ABLE TO CREATE A CONFIGURATION TRIGGERING THIS!\n",
             proxy_type_str(px), px->id);
    cfgerr++;
    break;
  }

  if (!(px->cap & PR_CAP_INT) && (px->cap & PR_CAP_FE) && LIST_ISEMPTY(&px->conf.listeners)) {
    ha_warning("%s '%s' has no 'bind' directive. Please declare it as a backend if this was intended.\n",
               proxy_type_str(px), px->id);
    *err_code |= ERR_WARN;
  }

  if (px->cap & PR_CAP_BE) {
    if (!(px->lbprm.algo & BE_LB_KIND)) {
      /* If no LB algo is set in a backend, we
       * want to use balance random by default.
       */
      px->lbprm.algo &= ~BE_LB_ALGO;
      px->lbprm.algo |= BE_LB_ALGO_RND;
    }
  }

  if ((px->tcpcheck.flags & TCPCHK_FL_UNUSED_HTTP_RS)) {
    ha_warning("%s '%s' uses http-check rules without 'option httpchk', so the rules are ignored.\n",
               proxy_type_str(px), px->id);
    *err_code |= ERR_WARN;
  }

  if ((px->options2 & PR_O2_CHK_ANY) == PR_O2_EXT_CHK) {
    if (!global.external_check) {
      ha_alert("Proxy '%s' : '%s' unable to find required 'global.external-check'.\n",
               px->id, "option external-check");
      cfgerr++;
    }
    if (!px->check_command) {
      ha_alert("Proxy '%s' : '%s' unable to find required 'external-check command'.\n",
               px->id, "option external-check");
      cfgerr++;
    }
    if (!(global.tune.options & GTUNE_INSECURE_FORK)) {
      ha_warning("Proxy '%s' : 'insecure-fork-wanted' not enabled in the global section, '%s' will likely fail.\n",
                 px->id, "option external-check");
      *err_code |= ERR_WARN;
    }
  }

  if (px->email_alert.flags & PR_EMAIL_ALERT_SET) {
    if (!(px->email_alert.mailers.name && px->email_alert.from && px->email_alert.to)) {
      ha_warning("'email-alert' will be ignored for %s '%s' (the presence any of "
                 "'email-alert from', 'email-alert level' 'email-alert mailers', "
                 "'email-alert myhostname', or 'email-alert to' "
                 "requires each of 'email-alert from', 'email-alert mailers' and 'email-alert to' "
                 "to be present).\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
      free_email_alert(px);
    }
    if (!px->email_alert.myhostname)
      px->email_alert.myhostname = strdup(hostname);
  }

  if (px->check_command) {
    int clear = 0;
    if ((px->options2 & PR_O2_CHK_ANY) != PR_O2_EXT_CHK) {
      ha_warning("'%s' will be ignored for %s '%s' (requires 'option external-check').\n",
                 "external-check command", proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
      clear = 1;
    }
    if (px->check_command[0] != '/' && !px->check_path) {
      ha_alert("Proxy '%s': '%s' does not have a leading '/' and 'external-check path' is not set.\n",
               px->id, "external-check command");
      cfgerr++;
    }
    if (clear) {
      ha_free(&px->check_command);
    }
  }

  if (px->check_path) {
    if ((px->options2 & PR_O2_CHK_ANY) != PR_O2_EXT_CHK) {
      ha_warning("'%s' will be ignored for %s '%s' (requires 'option external-check').\n",
                 "external-check path", proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
      ha_free(&px->check_path);
    }
  }

  /* if a default backend was specified, let's find it */
  if (px->defbe.name) {
    struct proxy *target;

    target = proxy_be_by_name(px->defbe.name);
    if (!target) {
      ha_alert("Proxy '%s': unable to find required default_backend: '%s'.\n",
               px->id, px->defbe.name);
      cfgerr++;
    } else if (target == px) {
      ha_alert("Proxy '%s': loop detected for default_backend: '%s'.\n",
               px->id, px->defbe.name);
      cfgerr++;
    } else if (target->mode != px->mode &&
         !(px->mode == PR_MODE_TCP && target->mode == PR_MODE_HTTP)) {

      ha_alert("%s %s '%s' (%s:%d) tries to use incompatible %s %s '%s' (%s:%d) as its default backend (see 'mode').\n",
               proxy_mode_str(px->mode), proxy_type_str(px), px->id,
               px->conf.file, px->conf.line,
               proxy_mode_str(target->mode), proxy_type_str(target), target->id,
               target->conf.file, target->conf.line);
      cfgerr++;
    } else {
      free(px->defbe.name);
      px->defbe.be = target;
      /* Emit a warning if this proxy also has some servers */
      if (!LIST_ISEMPTY(&px->servers)) {
        ha_warning("In proxy '%s', the 'default_backend' rule always has precedence over the servers, which will never be used.\n",
                   px->id);
        *err_code |= ERR_WARN;
      }
      if (target->mode == PR_MODE_HTTP) {
        /* at least one of the used backends will provoke an
         * HTTP upgrade
         */
        px->options |= PR_O_HTTP_UPG;
      }

      target->flags |= PR_FL_NON_PURGEABLE;
    }
  }

  /* find the target proxy for 'use_backend' rules */
  list_for_each_entry(rule, &px->switching_rules, list) {
    struct proxy *target;
    struct logformat_node *node;
    char *pxname;

    /* Try to parse the string as a log format expression. If the result
     * of the parsing is only one entry containing a simple string, then
     * it's a standard string corresponding to a static rule, thus the
     * parsing is cancelled and be.name is restored to be resolved.
     */
    pxname = rule->be.name;
    lf_expr_init(&rule->be.expr);
    px->conf.args.ctx = ARGC_UBK;
    px->conf.args.file = rule->file;
    px->conf.args.line = rule->line;
    err = NULL;
    if (!parse_logformat_string(pxname, px, &rule->be.expr, 0, SMP_VAL_FE_HRQ_HDR, &err)) {
      ha_alert("Parsing [%s:%d]: failed to parse use_backend rule '%s' : %s.\n",
               rule->file, rule->line, pxname, err);
      free(err);
      cfgerr++;
      continue;
    }
    node = LIST_NEXT(&rule->be.expr.nodes.list, struct logformat_node *, list);

    if (!lf_expr_isempty(&rule->be.expr)) {
      if (node->type != LOG_FMT_TEXT || node->list.n != &rule->be.expr.nodes.list) {
        rule->dynamic = 1;
        free(pxname);
        /* backend is not yet known so we cannot assume its type,
         * thus we should consider that at least one of the used
         * backends may provoke HTTP upgrade
         */
        px->options |= PR_O_HTTP_UPG;
        continue;
      }
      /* Only one element in the list, a simple string: free the expression and
       * fall back to static rule
       */
      lf_expr_deinit(&rule->be.expr);
    }

    rule->dynamic = 0;
    rule->be.name = pxname;

    target = proxy_be_by_name(rule->be.name);
    if (!target) {
      ha_alert("Proxy '%s': unable to find required use_backend: '%s'.\n",
               px->id, rule->be.name);
      cfgerr++;
    } else if (target == px) {
      ha_alert("Proxy '%s': loop detected for use_backend: '%s'.\n",
               px->id, rule->be.name);
      cfgerr++;
    } else if (target->mode != px->mode &&
         !(px->mode == PR_MODE_TCP && target->mode == PR_MODE_HTTP)) {

      ha_alert("%s %s '%s' (%s:%d) tries to use incompatible %s %s '%s' (%s:%d) in a 'use_backend' rule (see 'mode').\n",
               proxy_mode_str(px->mode), proxy_type_str(px), px->id,
               px->conf.file, px->conf.line,
               proxy_mode_str(target->mode), proxy_type_str(target), target->id,
               target->conf.file, target->conf.line);
      cfgerr++;
    } else {
      ha_free(&rule->be.name);
      rule->be.backend = target;
      if (target->mode == PR_MODE_HTTP) {
        /* at least one of the used backends will provoke an
         * HTTP upgrade
         */
        px->options |= PR_O_HTTP_UPG;
      }

      target->flags |= PR_FL_NON_PURGEABLE;
    }
    *err_code |= warnif_tcp_http_cond(px, rule->cond);
  }

  /* find the target server for 'use_server' rules */
  list_for_each_entry(srule, &px->server_rules, list) {
    struct server *target;
    struct logformat_node *node;
    char *server_name;

    /* We try to parse the string as a log format expression. If the result of the parsing
     * is only one entry containing a single string, then it's a standard string corresponding
     * to a static rule, thus the parsing is cancelled and we fall back to setting srv.ptr.
     */
    server_name = srule->srv.name;
    lf_expr_init(&srule->expr);
    px->conf.args.ctx = ARGC_USRV;
    err = NULL;
    if (!parse_logformat_string(server_name, px, &srule->expr, 0, SMP_VAL_FE_HRQ_HDR, &err)) {
      ha_alert("Parsing [%s:%d]; use-server rule failed to parse log-format '%s' : %s.\n",
               srule->file, srule->line, server_name, err);
      free(err);
      cfgerr++;
      continue;
    }
    node = LIST_NEXT(&srule->expr.nodes.list, struct logformat_node *, list);

    if (!lf_expr_isempty(&srule->expr)) {
      if (node->type != LOG_FMT_TEXT || node->list.n != &srule->expr.nodes.list) {
        srule->dynamic = 1;
        free(server_name);
        continue;
      }
      /* Only one element in the list, a simple string: free the expression and
       * fall back to static rule
       */
      lf_expr_deinit(&srule->expr);
    }

    srule->dynamic = 0;
    srule->srv.name = server_name;
    target = server_find_by_name(px, srule->srv.name);
    *err_code |= warnif_tcp_http_cond(px, srule->cond);

    if (!target) {
      ha_alert("%s '%s' : unable to find server '%s' referenced in a 'use-server' rule.\n",
               proxy_type_str(px), px->id, srule->srv.name);
      cfgerr++;
      continue;
    }
    ha_free(&srule->srv.name);
    srule->srv.ptr = target;
    target->flags |= SRV_F_NAME_REFD;
  }

  /* find the target table for 'stick' rules */
  list_for_each_entry(mrule, &px->sticking_rules, list) {
    px->be_req_ana |= AN_REQ_STICKING_RULES;
    if (mrule->flags & STK_IS_STORE)
      px->be_rsp_ana |= AN_RES_STORE_RULES;

    if (!resolve_stick_rule(px, mrule))
      cfgerr++;

    *err_code |= warnif_tcp_http_cond(px, mrule->cond);
  }

  /* find the target table for 'store response' rules */
  list_for_each_entry(mrule, &px->storersp_rules, list) {
    px->be_rsp_ana |= AN_RES_STORE_RULES;

    if (!resolve_stick_rule(px, mrule))
      cfgerr++;
  }

  /* check validity for 'tcp-request' layer 4/5/6/7 rules */
  cfgerr += check_action_rules(&px->tcp_req.l4_rules, px, err_code);
  cfgerr += check_action_rules(&px->tcp_req.l5_rules, px, err_code);
  cfgerr += check_action_rules(&px->tcp_req.inspect_rules, px, err_code);
  cfgerr += check_action_rules(&px->tcp_rep.inspect_rules, px, err_code);
  cfgerr += check_action_rules(&px->http_req_rules, px, err_code);
  cfgerr += check_action_rules(&px->http_res_rules, px, err_code);
  cfgerr += check_action_rules(&px->http_after_res_rules, px, err_code);
#ifdef USE_QUIC
  cfgerr += check_action_rules(&px->quic_init_rules, px, err_code);
#endif

  /* Warn is a switch-mode http is used on a TCP listener with servers but no backend */
  if (!px->defbe.name && LIST_ISEMPTY(&px->switching_rules) && !LIST_ISEMPTY(&px->servers)) {
    if ((px->options & PR_O_HTTP_UPG) && px->mode == PR_MODE_TCP)
      ha_warning("Proxy '%s' : 'switch-mode http' configured for a %s %s with no backend. "
                 "Incoming connections upgraded to HTTP cannot be routed to TCP servers\n",
                 px->id, proxy_mode_str(px->mode), proxy_type_str(px));
  }

  if (px->table && px->table->peers.name) {
    struct peers *curpeers;

    for (curpeers = cfg_peers; curpeers; curpeers = curpeers->next) {
      if (strcmp(curpeers->id, px->table->peers.name) == 0) {
        ha_free(&px->table->peers.name);
        px->table->peers.p = curpeers;
        break;
      }
    }

    if (!curpeers) {
      ha_alert("Proxy '%s': unable to find sync peers '%s'.\n",
               px->id, px->table->peers.name);
      ha_free(&px->table->peers.name);
      px->table->peers.p = NULL;
      cfgerr++;
    }
    else if (curpeers->disabled) {
      /* silently disable this peers section */
      px->table->peers.p = NULL;
    }
    else if (!curpeers->peers_fe) {
      ha_alert("Proxy '%s': unable to find local peer '%s' in peers section '%s'.\n",
               px->id, localpeer, curpeers->id);
      px->table->peers.p = NULL;
      cfgerr++;
    }
  }


  if (px->email_alert.mailers.name) {
    struct mailers *curmailers = mailers;

    for (curmailers = mailers; curmailers; curmailers = curmailers->next) {
      if (strcmp(curmailers->id, px->email_alert.mailers.name) == 0)
        break;
    }
    if (!curmailers) {
      ha_alert("Proxy '%s': unable to find mailers '%s'.\n",
               px->id, px->email_alert.mailers.name);
      free_email_alert(px);
      cfgerr++;
    }
    else {
      err = NULL;
      if (init_email_alert(curmailers, px, &err)) {
        ha_alert("Proxy '%s': %s.\n", px->id, err);
        free(err);
        cfgerr++;
      }
    }
  }

  if (px->uri_auth && !(px->uri_auth->flags & STAT_F_CONVDONE) &&
      !LIST_ISEMPTY(&px->uri_auth->http_req_rules) &&
      (px->uri_auth->userlist || px->uri_auth->auth_realm )) {
    ha_alert("%s '%s': stats 'auth'/'realm' and 'http-request' can't be used at the same time.\n",
             "proxy", px->id);
    cfgerr++;
    goto out_uri_auth_compat;
  }

  if (px->uri_auth && px->uri_auth->userlist &&
      (!(px->uri_auth->flags & STAT_F_CONVDONE) ||
       LIST_ISEMPTY(&px->uri_auth->http_req_rules))) {
    const char *uri_auth_compat_req[10];
    struct act_rule *rule;
    i = 0;

    /* build the ACL condition from scratch. We're relying on anonymous ACLs for that */
    uri_auth_compat_req[i++] = "auth";

    if (px->uri_auth->auth_realm) {
      uri_auth_compat_req[i++] = "realm";
      uri_auth_compat_req[i++] = px->uri_auth->auth_realm;
    }

    uri_auth_compat_req[i++] = "unless";
    uri_auth_compat_req[i++] = "{";
    uri_auth_compat_req[i++] = "http_auth(.internal-stats-userlist)";
    uri_auth_compat_req[i++] = "}";
    uri_auth_compat_req[i++] = "";

    rule = parse_http_req_cond(uri_auth_compat_req, "internal-stats-auth-compat", 0, px);
    if (!rule) {
      cfgerr++;
      goto out;
    }

    LIST_APPEND(&px->uri_auth->http_req_rules, &rule->list);

    if (px->uri_auth->auth_realm) {
      ha_free(&px->uri_auth->auth_realm);
    }
    px->uri_auth->flags |= STAT_F_CONVDONE;
  }
 out_uri_auth_compat:

  /* check whether we have a logger that uses RFC5424 log format */
  list_for_each_entry(tmplogger, &px->loggers, list) {
    if (tmplogger->format == LOG_FORMAT_RFC5424) {
      if (!px->logformat_sd.str) {
        /* set the default logformat_sd_string */
        px->logformat_sd.str = default_rfc5424_sd_log_format;
      }
      break;
    }
  }

  /* compile the log format */
  if (!(px->cap & PR_CAP_FE)) {
    lf_expr_deinit(&px->logformat);
    lf_expr_deinit(&px->logformat_sd);
  }

  if (px->logformat.str) {
    px->conf.args.ctx = ARGC_LOG;
    px->conf.args.file = px->logformat.conf.file;
    px->conf.args.line = px->logformat.conf.line;
    err = NULL;
    if (!lf_expr_compile(&px->logformat, &px->conf.args,
                                LOG_OPT_MANDATORY|LOG_OPT_MERGE_SPACES,
                                SMP_VAL_FE_LOG_END, &err) ||
        !lf_expr_postcheck(&px->logformat, px, &err)) {
      ha_alert("Parsing [%s:%d]: failed to parse log-format : %s.\n",
               px->logformat.conf.file, px->logformat.conf.line, err);
      free(err);
      cfgerr++;
    }
    px->conf.args.file = NULL;
    px->conf.args.line = 0;
  }

  if (px->logformat_sd.str) {
    px->conf.args.ctx = ARGC_LOGSD;
    px->conf.args.file = px->logformat_sd.conf.file;
    px->conf.args.line = px->logformat_sd.conf.line;
    err = NULL;
    if (!lf_expr_compile(&px->logformat_sd, &px->conf.args,
                                LOG_OPT_MANDATORY|LOG_OPT_MERGE_SPACES,
                                SMP_VAL_FE_LOG_END, &err) ||
        !add_to_logformat_list(NULL, NULL, LF_SEPARATOR, &px->logformat_sd, &err) ||
        !lf_expr_postcheck(&px->logformat_sd, px, &err)) {
      ha_alert("Parsing [%s:%d]: failed to parse log-format-sd : %s.\n",
               px->logformat_sd.conf.file, px->logformat_sd.conf.line, err);
      free(err);
      cfgerr++;
    }
    px->conf.args.file = NULL;
    px->conf.args.line = 0;
  }

  if (px->format_unique_id.str) {
    int where = 0;

    px->conf.args.ctx = ARGC_UIF;
    px->conf.args.file = px->format_unique_id.conf.file;
    px->conf.args.line = px->format_unique_id.conf.line;
    err = NULL;
    if (px->cap & PR_CAP_FE)
      where |= SMP_VAL_FE_HRQ_HDR;
    if (px->cap & PR_CAP_BE)
      where |= SMP_VAL_BE_HRQ_HDR;
    if (!lf_expr_compile(&px->format_unique_id, &px->conf.args,
                                LOG_OPT_HTTP|LOG_OPT_MERGE_SPACES, where, &err) ||
        !lf_expr_postcheck(&px->format_unique_id, px, &err)) {
      ha_alert("Parsing [%s:%d]: failed to parse unique-id : %s.\n",
               px->format_unique_id.conf.file, px->format_unique_id.conf.line, err);
      free(err);
      cfgerr++;
    }
    px->conf.args.file = NULL;
    px->conf.args.line = 0;
  }

  if (px->logformat_error.str) {
    px->conf.args.ctx = ARGC_LOG;
    px->conf.args.file = px->logformat_error.conf.file;
    px->conf.args.line = px->logformat_error.conf.line;
    err = NULL;
    if (!lf_expr_compile(&px->logformat_error, &px->conf.args,
                                LOG_OPT_MANDATORY|LOG_OPT_MERGE_SPACES,
                                SMP_VAL_FE_LOG_END, &err) ||
        !lf_expr_postcheck(&px->logformat_error, px, &err)) {
      ha_alert("Parsing [%s:%d]: failed to parse error-log-format : %s.\n",
               px->logformat_error.conf.file, px->logformat_error.conf.line, err);
      free(err);
      cfgerr++;
    }
    px->conf.args.file = NULL;
    px->conf.args.line = 0;
  }

  /* "balance hash" needs to compile its expression
   * (log backends will handle this in proxy log postcheck)
   */
  if (px->mode != PR_MODE_SYSLOG &&
      (px->lbprm.algo & BE_LB_ALGO) == BE_LB_ALGO_SMP) {
    int idx = 0;
    const char *args[] = {
      px->lbprm.arg_str,
      NULL,
    };

    err = NULL;
    px->conf.args.ctx = ARGC_USRV; // same context as use_server.
    px->lbprm.expr =
      sample_parse_expr((char **)args, &idx,
            px->conf.file, px->conf.line,
            &err, &px->conf.args, NULL);

    if (!px->lbprm.expr) {
      ha_alert("%s '%s' [%s:%d]: failed to parse 'balance hash' expression '%s' in : %s.\n",
               proxy_type_str(px), px->id,
               px->conf.file, px->conf.line,
               px->lbprm.arg_str, err);
      ha_free(&err);
      cfgerr++;
    }
    else if (!(px->lbprm.expr->fetch->val & SMP_VAL_BE_SET_SRV)) {
      ha_alert("%s '%s' [%s:%d]: error detected while parsing 'balance hash' expression '%s' "
               "which requires information from %s, which is not available here.\n",
               proxy_type_str(px), px->id,
               px->conf.file, px->conf.line,
               px->lbprm.arg_str, sample_src_names(px->lbprm.expr->fetch->use));
      cfgerr++;
    }
    else if (px->mode == PR_MODE_HTTP && (px->lbprm.expr->fetch->use & SMP_USE_L6REQ)) {
      ha_warning("%s '%s' [%s:%d]: L6 sample fetch <%s> will be ignored in 'balance hash' expression in HTTP mode.\n",
                 proxy_type_str(px), px->id,
                 px->conf.file, px->conf.line,
                 px->lbprm.arg_str);
    }
    else
      px->http_needed |= !!(px->lbprm.expr->fetch->use & SMP_USE_HTTP_ANY);
  }

  /* only now we can check if some args remain unresolved.
   * This must be done after the users and groups resolution.
   */
  err = NULL;
  i = smp_resolve_args(px, &err);
  cfgerr += i;
  if (i) {
    indent_msg(&err, 8);
    ha_alert("%s%s\n", i > 1 ? "multiple argument resolution errors:" : "", err);
    ha_free(&err);
  } else
    cfgerr += acl_find_targets(px);

  if (!(px->cap & PR_CAP_INT) && (px->mode == PR_MODE_TCP || px->mode == PR_MODE_HTTP) &&
      (((px->cap & PR_CAP_FE) && !px->timeout.client) ||
       ((px->cap & PR_CAP_BE) && !LIST_ISEMPTY(&px->servers) &&
        (!px->timeout.connect ||
         (!px->timeout.server && (px->mode == PR_MODE_HTTP || !px->timeout.tunnel)))))) {
    ha_warning("missing timeouts for %s '%s'.\n"
               "   | While not properly invalid, you will certainly encounter various problems\n"
               "   | with such a configuration. To fix this, please ensure that all following\n"
               "   | timeouts are set to a non-zero value: 'client', 'connect', 'server'.\n",
               proxy_type_str(px), px->id);
    *err_code |= ERR_WARN;
  }

  /* Historically, the tarpit and queue timeouts were inherited from contimeout.
   * We must still support older configurations, so let's find out whether those
   * parameters have been set or must be copied from contimeouts.
   */
  if (!px->timeout.tarpit)
    px->timeout.tarpit = px->timeout.connect;
  if ((px->cap & PR_CAP_BE) && !px->timeout.queue)
    px->timeout.queue = px->timeout.connect;

  if (px->tcpcheck.flags & TCPCHK_FL_UNUSED_TCP_RS) {
    ha_warning("%s '%s' uses tcp-check rules without 'option tcp-check', so the rules are ignored.\n",
               proxy_type_str(px), px->id);
    *err_code |= ERR_WARN;
  }

  /* ensure that cookie capture length is not too large */
  if (px->capture_len >= global.tune.cookie_len) {
    ha_warning("truncating capture length to %d bytes for %s '%s'.\n",
               global.tune.cookie_len - 1, proxy_type_str(px), px->id);
    *err_code |= ERR_WARN;
    px->capture_len = global.tune.cookie_len - 1;
  }

  /* The small pools required for the capture lists */
  if (px->nb_req_cap) {
    px->req_cap_pool = create_pool("ptrcap",
                                         px->nb_req_cap * sizeof(char *),
                                         MEM_F_SHARED);
  }

  if (px->nb_rsp_cap) {
    px->rsp_cap_pool = create_pool("ptrcap",
                                         px->nb_rsp_cap * sizeof(char *),
                                         MEM_F_SHARED);
  }

  switch (px->load_server_state_from_file) {
    case PR_SRV_STATE_FILE_UNSPEC:
      px->load_server_state_from_file = PR_SRV_STATE_FILE_NONE;
      break;
    case PR_SRV_STATE_FILE_GLOBAL:
      if (!global.server_state_file) {
        ha_warning("backend '%s' configured to load server state file from global section 'server-state-file' directive. Unfortunately, 'server-state-file' is not set!\n",
                   px->id);
        *err_code |= ERR_WARN;
      }
      break;
  }

  /* assign automatic UIDs to servers which don't have one yet */
  next_id = 1;
  list_for_each_entry(newsrv, &px->servers, el_px) {
    if (!newsrv->puid) {
      /* server ID not set, use automatic numbering with first
       * spare entry starting with next_svid.
       */
      next_id = server_get_next_id(px, next_id);
      newsrv->puid = next_id;
      server_index_id(px, newsrv);
    }

    next_id++;
  }

  px->lbprm.wmult = 1; /* default weight multiplier */
  px->lbprm.wdiv  = 1; /* default weight divider */

  /*
   * If this server supports a maxconn parameter, it needs a dedicated
   * tasks to fill the emptied slots when a connection leaves.
   * Also, resolve deferred tracking dependency if needed.
   */
  list_for_each_entry(newsrv, &px->servers, el_px) {
    set_usermsgs_ctx(newsrv->conf.file, newsrv->conf.line, &newsrv->obj_type);

    srv_minmax_conn_apply(newsrv);

    *err_code |= check_server_tcpcheck(newsrv);
    if (*err_code & (ERR_ABORT|ERR_FATAL))
      goto out;

    /* this will also properly set the transport layer for
     * prod and checks
     * if default-server have use_ssl, prerare ssl init
     * without activating it */
    if (newsrv->use_ssl == 1 || newsrv->check.use_ssl == 1 ||
        (newsrv->check.tcpcheck->flags & TCPCHK_FL_USE_SSL) ||
        ((newsrv->flags & SRV_F_DEFSRV_USE_SSL) && newsrv->use_ssl != 1)) {
      /* QUIC servers are also updated here. */
      if (xprt_get(XPRT_SSL) && xprt_get(XPRT_SSL)->prepare_srv)
        cfgerr += xprt_get(XPRT_SSL)->prepare_srv(newsrv);
    }

    /* In HTTP only, if the SNI is not set and we can rely on the
     * host header value, fill the sni expression accordingly
     */
    if (newsrv->proxy->mode == PR_MODE_HTTP &&
        (newsrv->use_ssl == 1 || (newsrv->flags & SRV_F_DEFSRV_USE_SSL)) &&
        !newsrv->sni_expr && !(newsrv->ssl_ctx.options & SRV_SSL_O_NO_AUTO_SNI)) {
      if (srv_configure_auto_sni(newsrv, err_code, &err)) {
        ha_alert("parsing [%s:%d]: %s.\n",
                 newsrv->conf.file, newsrv->conf.line, err);
        ha_free(&err);
        ++cfgerr;
        if (*err_code & ERR_ABORT)
          goto out;
        goto next_srv;
      }
    }


    if ((newsrv->flags & SRV_F_FASTOPEN) &&
        ((px->retry_type & (PR_RE_DISCONNECTED | PR_RE_TIMEOUT)) !=
         (PR_RE_DISCONNECTED | PR_RE_TIMEOUT)))
      ha_warning("server has tfo activated, the backend should be configured with at least 'conn-failure', 'empty-response' and 'response-timeout' or we wouldn't be able to retry the connection on failure.\n");

    if (newsrv->trackit) {
      if (srv_apply_track(newsrv, px)) {
        ++cfgerr;
        goto next_srv;
      }
    }

  next_srv:
    reset_usermsgs_ctx();
  }

  /*
   * Try to generate dynamic cookies for servers now.
   * It couldn't be done earlier, since at the time we parsed
   * the server line, we may not have known yet that we
   * should use dynamic cookies, or the secret key may not
   * have been provided yet.
   */
  if (px->ck_opts & PR_CK_DYNAMIC) {
    list_for_each_entry(newsrv, &px->servers, el_px)
      srv_set_dyncookie(newsrv);

  }
  /* We have to initialize the server lookup mechanism depending
   * on what LB algorithm was chosen.
   */

  px->lbprm.algo &= ~(BE_LB_LKUP | BE_LB_PROP_DYN);
  list_for_each_entry(ops, &lb_ops_list, link) {
    int i;
    for (i = 0; ops->map[i].match != 0; i++) {
      if ((px->lbprm.algo & ops->map[i].mask) == ops->map[i].match) {
        px->lbprm.ops = ops;
        break;
      }
    }

    if (px->lbprm.ops) {
      px->lbprm.algo |= px->lbprm.ops->algo_prop;
      if (px->lbprm.ops->proxy_init && px->lbprm.ops->proxy_init(px) < 0)
        cfgerr++;
      break;
    }
  }

  HA_RWLOCK_INIT(&px->lbprm.lock);

  if (px->options & PR_O_LOGASAP)
    px->to_log &= ~LW_BYTES;

  if (!(px->cap & PR_CAP_INT) && (px->mode == PR_MODE_TCP || px->mode == PR_MODE_HTTP) &&
      (px->cap & PR_CAP_FE) && LIST_ISEMPTY(&px->loggers) &&
      (!lf_expr_isempty(&px->logformat) || !lf_expr_isempty(&px->logformat_sd))) {
    ha_warning("log format ignored for %s '%s' since it has no log address.\n",
               proxy_type_str(px), px->id);
    *err_code |= ERR_WARN;
  }

  *err_code |= proxy_check_http_errors(px);

  if (px->mode != PR_MODE_HTTP && !(px->options & PR_O_HTTP_UPG)) {
    int optnum;

    if (px->uri_auth) {
      ha_warning("'stats' statement ignored for %s '%s' as it requires HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
      stats_uri_auth_drop(px->uri_auth);
      px->uri_auth = NULL;
    }

    if (px->capture_name) {
      ha_warning("'capture' statement ignored for %s '%s' as it requires HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
    }

    if (isttest(px->monitor_uri)) {
      ha_warning("'monitor-uri' statement ignored for %s '%s' as it requires HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
    }

    if (!LIST_ISEMPTY(&px->http_req_rules)) {
      ha_warning("'http-request' rules ignored for %s '%s' as they require HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
    }

    if (!LIST_ISEMPTY(&px->http_res_rules)) {
      ha_warning("'http-response' rules ignored for %s '%s' as they require HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
    }

    if (!LIST_ISEMPTY(&px->http_after_res_rules)) {
      ha_warning("'http-after-response' rules ignored for %s '%s' as they require HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
    }

    if (!LIST_ISEMPTY(&px->redirect_rules)) {
      ha_warning("'redirect' rules ignored for %s '%s' as they require HTTP mode.\n",
                 proxy_type_str(px), px->id);
      *err_code |= ERR_WARN;
    }

    for (optnum = 0; cfg_opts[optnum].name; optnum++) {
      if (cfg_opts[optnum].mode == PR_MODE_HTTP &&
          (px->cap & cfg_opts[optnum].cap) &&
          (px->options & cfg_opts[optnum].val)) {
        ha_warning("'option %s' ignored for %s '%s' as it requires HTTP mode.\n",
                   cfg_opts[optnum].name, proxy_type_str(px), px->id);
        *err_code |= ERR_WARN;
        px->options &= ~cfg_opts[optnum].val;
      }
    }

    for (optnum = 0; cfg_opts2[optnum].name; optnum++) {
      if (cfg_opts2[optnum].mode == PR_MODE_HTTP &&
          (px->cap & cfg_opts2[optnum].cap) &&
          (px->options2 & cfg_opts2[optnum].val)) {
        ha_warning("'option %s' ignored for %s '%s' as it requires HTTP mode.\n",
                   cfg_opts2[optnum].name, proxy_type_str(px), px->id);
        *err_code |= ERR_WARN;
        px->options2 &= ~cfg_opts2[optnum].val;
      }
    }

#if defined(CONFIG_HAP_TRANSPARENT)
    if (px->conn_src.bind_hdr_occ) {
      px->conn_src.bind_hdr_occ = 0;
      ha_warning("%s '%s' : ignoring use of header %s as source IP in non-HTTP mode.\n",
                 proxy_type_str(px), px->id, px->conn_src.bind_hdr_name);
      *err_code |= ERR_WARN;
    }
#endif /* CONFIG_HAP_TRANSPARENT */
  }

  /*
   * ensure that we're not cross-dressing a TCP server into HTTP.
   */
  list_for_each_entry(newsrv, &px->servers, el_px) {
    if ((px->mode != PR_MODE_HTTP) && newsrv->rdr_len) {
      ha_alert("%s '%s' : server cannot have cookie or redirect prefix in non-HTTP mode.\n",
               proxy_type_str(px), px->id);
      cfgerr++;
    }

    if ((px->mode != PR_MODE_HTTP) && newsrv->cklen) {
      ha_warning("%s '%s' : ignoring cookie for server '%s' as HTTP mode is disabled.\n",
                 proxy_type_str(px), px->id, newsrv->id);
      *err_code |= ERR_WARN;
    }

    if ((newsrv->flags & SRV_F_MAPPORTS) && (px->options2 & PR_O2_RDPC_PRST)) {
      ha_warning("%s '%s' : RDP cookie persistence will not work for server '%s' because it lacks an explicit port number.\n",
                 proxy_type_str(px), px->id, newsrv->id);
      *err_code |= ERR_WARN;
    }

#if defined(CONFIG_HAP_TRANSPARENT)
    if (px->mode != PR_MODE_HTTP && newsrv->conn_src.bind_hdr_occ) {
      newsrv->conn_src.bind_hdr_occ = 0;
      ha_warning("%s '%s' : server %s cannot use header %s as source IP in non-HTTP mode.\n",
                 proxy_type_str(px), px->id, newsrv->id, newsrv->conn_src.bind_hdr_name);
      *err_code |= ERR_WARN;
    }
#endif /* CONFIG_HAP_TRANSPARENT */

    if ((px->mode != PR_MODE_HTTP) && (px->options & PR_O_REUSE_MASK) != PR_O_REUSE_NEVR)
      px->options &= ~PR_O_REUSE_MASK;
    if (px->mode == PR_MODE_SPOP)
      px->options |= PR_O_REUSE_ALWS;

    if ((px->mode != PR_MODE_HTTP) && newsrv->flags & SRV_F_RHTTP) {
      ha_alert("%s '%s' : server %s uses reverse HTTP addressing which can only be used with HTTP mode.\n",
               proxy_type_str(px), px->id, newsrv->id);
      cfgerr++;
      *err_code |= ERR_FATAL | ERR_ALERT;
      goto out;
    }
  }

  /* Check filter configuration, if any */
  cfgerr += flt_check(px);

  if (px->cap & PR_CAP_FE) {
    if (!px->accept)
      px->accept = frontend_accept;

    if (!LIST_ISEMPTY(&px->tcp_req.inspect_rules) ||
        (px->defpx && !LIST_ISEMPTY(&px->defpx->tcp_req.inspect_rules)))
      px->fe_req_ana |= AN_REQ_INSPECT_FE;

    if (px->mode == PR_MODE_HTTP) {
      px->fe_req_ana |= AN_REQ_WAIT_HTTP | AN_REQ_HTTP_PROCESS_FE;
      px->fe_rsp_ana |= AN_RES_WAIT_HTTP | AN_RES_HTTP_PROCESS_FE;
    }

    if (px->mode == PR_MODE_CLI) {
      px->fe_req_ana |= AN_REQ_WAIT_CLI;
      px->fe_rsp_ana |= AN_RES_WAIT_CLI;
    }

    /* both TCP and HTTP must check switching rules */
    px->fe_req_ana |= AN_REQ_SWITCHING_RULES;

    /* Add filters analyzers if needed */
    if (!LIST_ISEMPTY(&px->filter_configs)) {
      px->fe_req_ana |= AN_REQ_FLT_START_FE | AN_REQ_FLT_XFER_DATA | AN_REQ_FLT_END;
      px->fe_rsp_ana |= AN_RES_FLT_START_FE | AN_RES_FLT_XFER_DATA | AN_RES_FLT_END;
    }
  }

  if (px->cap & PR_CAP_BE) {
    if (!LIST_ISEMPTY(&px->tcp_req.inspect_rules) ||
        (px->defpx && !LIST_ISEMPTY(&px->defpx->tcp_req.inspect_rules)))
      px->be_req_ana |= AN_REQ_INSPECT_BE;

    if (!LIST_ISEMPTY(&px->tcp_rep.inspect_rules) ||
        (px->defpx && !LIST_ISEMPTY(&px->defpx->tcp_rep.inspect_rules)))
                        px->be_rsp_ana |= AN_RES_INSPECT;

    if (px->mode == PR_MODE_HTTP) {
      px->be_req_ana |= AN_REQ_WAIT_HTTP | AN_REQ_HTTP_INNER | AN_REQ_HTTP_PROCESS_BE;
      px->be_rsp_ana |= AN_RES_WAIT_HTTP | AN_RES_HTTP_PROCESS_BE;
    }

    /* If the backend does requires RDP cookie persistence, we have to
     * enable the corresponding analyser.
     */
    if (px->options2 & PR_O2_RDPC_PRST)
      px->be_req_ana |= AN_REQ_PRST_RDP_COOKIE;

    /* Add filters analyzers if needed */
    if (!LIST_ISEMPTY(&px->filter_configs)) {
      px->be_req_ana |= AN_REQ_FLT_START_BE | AN_REQ_FLT_XFER_DATA | AN_REQ_FLT_END;
      px->be_rsp_ana |= AN_RES_FLT_START_BE | AN_RES_FLT_XFER_DATA | AN_RES_FLT_END;
    }
  }

  /* Check the mux protocols, if any, for each server attached to
   * the current proxy */
  list_for_each_entry(newsrv, &px->servers, el_px) {
    int mode = conn_pr_mode_to_proto_mode(px->mode);
    const struct mux_proto_list *mux_ent;

    if (srv_is_quic(newsrv)) {
      if (!newsrv->mux_proto) {
        /* Force QUIC as mux-proto on server with quic addresses, similarly to bind on FE side. */
        newsrv->mux_proto = get_mux_proto(ist("quic"));
      }
    }

    if (!newsrv->mux_proto)
      continue;

    /* it is possible that an incorrect mux was referenced
     * due to the proxy's mode not being taken into account
     * on first pass. Let's adjust it now.
     */
    mux_ent = conn_get_best_mux_entry(newsrv->mux_proto->mux_proto, IST_NULL, PROTO_SIDE_BE, srv_is_quic(newsrv), mode);

    if (!mux_ent || !isteq(mux_ent->mux_proto, newsrv->mux_proto->mux_proto)) {
      ha_alert("%s '%s' : MUX protocol '%.*s' is not usable for server '%s' at [%s:%d].\n",
               proxy_type_str(px), px->id,
               (int)newsrv->mux_proto->mux_proto.len,
               newsrv->mux_proto->mux_proto.ptr,
               newsrv->id, newsrv->conf.file, newsrv->conf.line);
      cfgerr++;
    }
    else {
      if ((mux_ent->mux->flags & MX_FL_FRAMED) && !srv_is_quic(newsrv)) {
        ha_alert("%s '%s' : MUX protocol '%.*s' is incompatible with stream transport used by server '%s' at [%s:%d].\n",
                 proxy_type_str(px), px->id,
                 (int)newsrv->mux_proto->mux_proto.len,
                 newsrv->mux_proto->mux_proto.ptr,
                 newsrv->id, newsrv->conf.file, newsrv->conf.line);
        cfgerr++;
      }
      else if (!(mux_ent->mux->flags & MX_FL_FRAMED) && srv_is_quic(newsrv)) {
        ha_alert("%s '%s' : MUX protocol '%.*s' is incompatible with framed transport used by server '%s' at [%s:%d].\n",
                 proxy_type_str(px), px->id,
                 (int)newsrv->mux_proto->mux_proto.len,
                 newsrv->mux_proto->mux_proto.ptr,
                 newsrv->id, newsrv->conf.file, newsrv->conf.line);
        cfgerr++;
      }
    }

    /* update the mux */
    newsrv->mux_proto = mux_ent;
  }

  /* Allocate default tcp-check rules for proxies without
   * explicit rules.
   */
  if (px->cap & PR_CAP_BE) {
    if (!(px->options2 & PR_O2_CHK_ANY)) {
      struct tcpcheck_ruleset *rs = NULL;

      px->options2 |= PR_O2_TCPCHK_CHK;

      rs = find_tcpcheck_ruleset("*tcp-check");
      if (!rs) {
        rs = create_tcpcheck_ruleset("*tcp-check");
        if (rs == NULL) {
          ha_alert("config: %s '%s': out of memory.\n",
                   proxy_type_str(px), px->id);
          cfgerr++;
        }
      }
      px->tcpcheck.rs = rs;
      free_tcpcheck_vars(&px->tcpcheck.preset_vars);
    }
  }

 out:
  if (cfgerr)
    *err_code |= ERR_ALERT | ERR_FATAL;

  return cfgerr;
}

/* Frees all dynamic settings allocated on a default proxy that's about to be
 * destroyed. Note that most of the fields are not even reset, so extreme care
 * is required here.
 */
static void defaults_px_free(struct proxy *defproxy)
{
  struct cap_hdr *h,*h_next;

  proxy_free_common(defproxy);

  /* default proxy specific cleanup */
  if (defproxy->defsrv)
    srv_free_params(defproxy->defsrv);
  ha_free(&defproxy->defbe.name);
  srv_free(&defproxy->defsrv);

  h = defproxy->req_cap;
  while (h) {
    h_next = h->next;
    free(h->name);
    pool_destroy(h->pool);
    free(h);
    h = h_next;
  }

  h = defproxy->rsp_cap;
  while (h) {
    h_next = h->next;
    free(h->name);
    pool_destroy(h->pool);
    free(h);
    h = h_next;
  }

  proxy_release_conf_errors(defproxy);
  deinit_proxy_tcpcheck(defproxy);
}

/* Removes <px> defaults instance from the name tree, free its content and
 * storage. This must only be used if <px> is unreferenced.
 *
 * Uses PROXIES_DEL_LOCK to protect global tree/list accesses.
 */
void defaults_px_destroy(struct proxy *px)
{
  BUG_ON(!(px->cap & PR_CAP_DEF));
  BUG_ON(px->conf.def_ref != 0);

  HA_SPIN_LOCK(PROXIES_DEL_LOCK, &proxies_del_lock);
  cebis_item_delete(&defproxy_by_name, conf.name_node, id, px);
  LIST_DELETE(&px->el);
  HA_SPIN_UNLOCK(PROXIES_DEL_LOCK, &proxies_del_lock);

  defaults_px_free(px);
  free(px);
}

/* delete all unreferenced default proxies. A default proxy is unreferenced if
 * its <def_ref> count is equal to zero.
 *
 * Not thread safe - currently only used during init.
 */
void defaults_px_destroy_all_unref(void)
{
  struct proxy *px, *nx;

  for (px = cebis_item_first(&defproxy_by_name, conf.name_node, id, struct proxy); px; px = nx) {
    BUG_ON(!(px->cap & PR_CAP_DEF));
    nx = cebis_item_next(&defproxy_by_name, conf.name_node, id, px);
    if (!HA_ATOMIC_LOAD(&px->conf.def_ref))
      defaults_px_destroy(px);
  }
}

/* Removes <px> defaults from the name tree. This operation is useful when a
 * section is made invisible by a newer instance with the same name. If <px> is
 * not referenced it is freed immediately, else it is kept in defaults_list.
 *
 * Not thread safe - currently only used during parsing.
 */
void defaults_px_detach(struct proxy *px)
{
  BUG_ON(!(px->cap & PR_CAP_DEF));
  cebis_item_delete(&defproxy_by_name, conf.name_node, id, px);
  if (!HA_ATOMIC_LOAD(&px->conf.def_ref))
    defaults_px_destroy(px);
  /* If not destroyed, <px> can still be accessed in <defaults_list>. */
}

/* Increments by one defaults proxy reference of all defaults stored in tree name.
 *
 * Not thread safe - currently only used during init.
 */
void defaults_px_ref_all(void)
{
  struct proxy *px;

  for (px = cebis_item_first(&defproxy_by_name, conf.name_node, id, struct proxy);
       px;
       px = cebis_item_next(&defproxy_by_name, conf.name_node, id, px)) {
    HA_ATOMIC_INC(&px->conf.def_ref);
  }
}

/* Decrements defaults proxy ref of all defaults. This is the reverse of
 * defaults_px_ref_all().
 *
 * Not thread safe - currently only used during deinit.
 */
void defaults_px_unref_all(void)
{
  struct proxy *px, *nx;

  for (px = cebis_item_first(&defproxy_by_name, conf.name_node, id, struct proxy); px; px = nx) {
    nx = cebis_item_next(&defproxy_by_name, conf.name_node, id, px);

    BUG_ON(!px->conf.def_ref);
    if (!HA_ATOMIC_SUB_FETCH(&px->conf.def_ref, 1))
      defaults_px_destroy(px);
  }
}

/* Add a reference on the default proxy <defpx> for the proxy <px> Nothing is
 * done if <px> already references <defpx>. Otherwise, the default proxy
 * <def_ref> count is incremented by one.
 *
 * Access on default proxy reference is thread safe thanks to atomic ops.
 */
static inline void defaults_px_ref(struct proxy *defpx, struct proxy *px)
{
  if (px->defpx == defpx)
    return;
  /* <px> is already referencing another defaults. */
  BUG_ON(px->defpx);

  px->defpx = defpx;
  HA_ATOMIC_INC(&defpx->conf.def_ref);
}

/* Check that <px> can inherits from <defpx> default proxy. If some settings
 * cannot be copied, <def_ref> count of the defaults instance is incremented.
 * Inheritance may be impossible due to incompatibility issues. In this case,
 * <errmsg> will be allocated to point to a textual description of the error.
 *
 * Returns ERR_NONE on success and a combination of ERR_CODE on failure
 */
int proxy_ref_defaults(struct proxy *px, struct proxy *defpx, char **errmsg)
{
  char defcap = defpx->cap & PR_CAP_LISTEN;
  int err_code = ERR_NONE;

  if ((px->cap & PR_CAP_BE) && (defpx->nb_req_cap || defpx->nb_rsp_cap)) {
    memprintf(errmsg, "backend or defaults sections cannot inherit from a defaults section defining"
             " captures (defaults section at %s:%d)",
             defpx->conf.file, defpx->conf.line);
    err_code |= ERR_ALERT | ERR_ABORT;
    goto out;
  }

  /* If the current default proxy defines TCP/HTTP rules, the
   * current proxy will keep a reference on it. But some sanity
   * checks are performed first:
   *
   * - It cannot be used to init a defaults section
   * - It cannot be used to init a listen section
   * - It cannot be used to init backend and frontend sections at
   *   same time. It can be used to init several sections of the
   *   same type only.
   * - It cannot define L4/L5 TCP rules if it is used to init
   *   backend sections.
   * - It cannot define 'tcp-response content' rules if it
   *   is used to init frontend sections.
   *
   * If no error is found, <def_ref> count of the default proxy is incremented.
   */
  if ((!LIST_ISEMPTY(&defpx->http_req_rules)        ||
       !LIST_ISEMPTY(&defpx->http_res_rules)        ||
       !LIST_ISEMPTY(&defpx->http_after_res_rules)  ||
       !LIST_ISEMPTY(&defpx->tcp_req.l4_rules)      ||
       !LIST_ISEMPTY(&defpx->tcp_req.l5_rules)      ||
       !LIST_ISEMPTY(&defpx->tcp_req.inspect_rules) ||
       !LIST_ISEMPTY(&defpx->tcp_rep.inspect_rules))) {

    /* Note: Add tcpcheck_rules too if unresolve args become allowed in defaults section */
    if (px->cap & PR_CAP_DEF) {
      memprintf(errmsg, "a defaults section cannot inherit from a defaults section defining TCP/HTTP rules (defaults section at %s:%d)",
                defpx->conf.file, defpx->conf.line);
      err_code |= ERR_ALERT | ERR_ABORT;
      goto out;
    }
    else if ((px->cap & PR_CAP_LISTEN) == PR_CAP_LISTEN) {
      memprintf(errmsg, "a listen section cannot inherit from a defaults section defining TCP/HTTP rules");
      err_code |= ERR_ALERT | ERR_ABORT;
      goto out;
    }
    else if ((defcap == PR_CAP_BE || defcap == PR_CAP_FE) && (px->cap & PR_CAP_LISTEN) != defcap) {
      memprintf(errmsg, "frontends and backends cannot inherit from the same defaults section"
               " if it defines TCP/HTTP rules (defaults section at %s:%d)",
               defpx->conf.file, defpx->conf.line);
      err_code |= ERR_ALERT | ERR_ABORT;
      goto out;
    }
    else if (!(px->cap & PR_CAP_FE) && (!LIST_ISEMPTY(&defpx->tcp_req.l4_rules) ||
             !LIST_ISEMPTY(&defpx->tcp_req.l5_rules))) {
      memprintf(errmsg, "a backend section cannot inherit from a defaults section defining"
               " 'tcp-request connection' or 'tcp-request session' rules (defaults section at %s:%d)",
               defpx->conf.file, defpx->conf.line);
      err_code |= ERR_ALERT | ERR_ABORT;
      goto out;
    }
    else if (!(px->cap & PR_CAP_BE) && !LIST_ISEMPTY(&defpx->tcp_rep.inspect_rules)) {
      memprintf(errmsg, "a frontend section cannot inherit from a defaults section defining"
               " 'tcp-response content' rules (defaults section at %s:%d)",
               defpx->conf.file, defpx->conf.line);
      err_code |= ERR_ALERT | ERR_ABORT;
      goto out;
    }

    defpx->cap = (defpx->cap & ~PR_CAP_LISTEN) | (px->cap & PR_CAP_LISTEN);
    defaults_px_ref(defpx, px);
  }

  if (defpx->tcpcheck.rs && (defpx->tcpcheck.rs->flags & TCPCHK_RULES_PROTO_CHK) &&
      (px->cap & PR_CAP_LISTEN) == PR_CAP_BE) {
    /* If the current default proxy defines tcpcheck rules, the
     * current proxy will keep a reference on it. but only if the
     * current proxy has the backend capability.
     */
    defaults_px_ref(defpx, px);
  }

 out:
  return err_code;
}

/* proxy <px> removes its reference on its default proxy. The default proxy
 * <def_ref> count is decremented by one. If it was the last reference, the
 * corresponding default proxy is destroyed.
 *
 * Access on default proxy reference is thread safe thanks to atomic ops.
 */
void proxy_unref_defaults(struct proxy *px)
{
  if (px->defpx == NULL)
    return;
  if (!HA_ATOMIC_SUB_FETCH(&px->defpx->conf.def_ref, 1))
    defaults_px_destroy(px->defpx);
  px->defpx = NULL;
}

/* prepares a new proxy <name> of type <cap> from the provided <px>
 * pointer.
 * <px> is assumed to be freshly allocated
 * <name> may be NULL: proxy id assignment will be skipped.
 *
 * Returns a 1 on success or 0 on failure (in which case errmsg must be checked
 * then freed).
 */
int setup_new_proxy(struct proxy *px, const char *name, unsigned int cap, char **errmsg)
{
  init_new_proxy(px);

  if (name) {
    px->id = strdup(name);
    if (!px->id) {
      memprintf(errmsg, "out of memory");
      goto fail;
    }
  }

  px->cap = cap;
  px->last_change = ns_to_sec(now_ns);

  /* Internal proxies or with empty name are not stored in the named tree. */
  if (name && name[0] != '\0' && !(cap & PR_CAP_INT))
    proxy_store_name(px);

  if (!(cap & PR_CAP_DEF))
    LIST_APPEND(&all_proxies, &px->global_list);

  return 1;

 fail:
  if (name)
    memprintf(errmsg, "proxy '%s': %s", name, *errmsg);

  srv_free(&px->defsrv);
  ha_free(&px->id);
  counters_fe_shared_drop(&px->fe_counters.shared);
  counters_be_shared_drop(&px->be_counters.shared);

  return 0;
}

/* Allocates a new proxy <name> of type <cap>.
 * Returns the proxy instance on success. On error, NULL is returned.
 */
struct proxy *alloc_new_proxy(const char *name, unsigned int cap, char **errmsg)
{
  struct proxy *curproxy;

  if ((curproxy = ha_aligned_zalloc_typed(1, typeof(*curproxy))) == NULL) {
    memprintf(errmsg, "proxy '%s': out of memory", name);
    goto fail;
  }

  if (!setup_new_proxy(curproxy, name, cap, errmsg))
    goto fail;

  proxy_take(curproxy);

 done:
  return curproxy;

 fail:
  /* Note: in case of fatal error here, we WILL make valgrind unhappy,
   * but its not worth trying to unroll everything here just before
   * quitting.
   */
  if (curproxy)
    srv_free(&curproxy->defsrv);
  free(curproxy);
  return NULL;
}

/* Increment <px> refcount. Does nothing for a default proxy instance. */
void proxy_take(struct proxy *px)
{
  if (!(px->cap & PR_CAP_DEF))
    HA_ATOMIC_INC(&px->refcount);
}

/* post-check for proxies */
static int proxy_postcheck(struct proxy *px)
{
  struct listener *listener;
  char *errmsg = NULL;
  int err_code = ERR_NONE;

  /* allocate private memory for shared counters: used as a fallback
   * or when sharing is disabled. If sharing is enabled pointers will
   * be updated to point to the proper shared memory location during
   * proxy postparsing, see proxy_postparse()
   */
  if (px->cap & PR_CAP_FE) {
    if (!counters_fe_shared_prepare(&px->fe_counters.shared, &px->guid, &errmsg)) {
      ha_alert("out of memory while setting up shared counters for %s %s : %s\n",
               proxy_type_str(px), px->id, errmsg);
      ha_free(&errmsg);
      err_code |= ERR_ALERT | ERR_FATAL;
      goto out;
    }
  }
  if (px->cap & (PR_CAP_FE|PR_CAP_BE)) {
    /* by default stream->be points to stream->fe, thus proxy
     * be_counters may be used even if the proxy lacks the backend
     * capability
     */
    if (!counters_be_shared_prepare(&px->be_counters.shared, &px->guid, &errmsg)) {
      ha_alert("out of memory while setting up shared counters for %s %s : %s\n",
               proxy_type_str(px), px->id, errmsg);
      ha_free(&errmsg);
      err_code |= ERR_ALERT | ERR_FATAL;
      goto out;
    }

  }

  list_for_each_entry(listener, &px->conf.listeners, by_fe) {
    if (listener->counters) {
      if (!counters_fe_shared_prepare(&listener->counters->shared, &listener->guid, &errmsg)) {
        ha_free(&listener->counters);
        ha_alert("out of memory while setting up shared listener counters for %s %s : %s\n",
                 proxy_type_str(px), px->id, errmsg);
        ha_free(&errmsg);
        err_code |= ERR_ALERT | ERR_FATAL;
        goto out;
      }
    }
  }

 out:
  return err_code;
}
REGISTER_POST_PROXY_CHECK(proxy_postcheck);

/* Copy the proxy settings from <defproxy> to <curproxy>.
 * Returns 0 on success.
 * Returns 1 on error. <errmsg> will be allocated with an error description.
 */
static int proxy_defproxy_cpy(struct proxy *curproxy, const struct proxy *defproxy,
                              char **errmsg)
{
  struct logger *tmplogger;
  char *tmpmsg = NULL;

  /* set default values from the specified default proxy */

  if (defproxy->defsrv) {
    if (!curproxy->defsrv) {
      /* there's a default-server in the defaults proxy but
       * none allocated yet in the current proxy so we have
       * to allocate and pre-initialize it right now.
       */
      curproxy->defsrv = srv_alloc();
      if (!curproxy->defsrv) {
        memprintf(errmsg, "proxy '%s': out of memory allocating default-server", curproxy->id);
        return 1;
      }

      curproxy->defsrv->id = NULL;
      srv_settings_init(curproxy->defsrv);
    }
    srv_settings_cpy(curproxy->defsrv, defproxy->defsrv, 0);
  }

  curproxy->flags = (defproxy->flags & PR_FL_DISABLED); /* Only inherit from disabled flag */
  curproxy->options = defproxy->options;
  curproxy->options2 = defproxy->options2;
  curproxy->no_options = defproxy->no_options;
  curproxy->no_options2 = defproxy->no_options2;
  curproxy->retry_type = defproxy->retry_type;
  curproxy->tcp_req.inspect_delay = defproxy->tcp_req.inspect_delay;
  curproxy->tcp_rep.inspect_delay = defproxy->tcp_rep.inspect_delay;

  http_ext_clean(curproxy);
  http_ext_dup(defproxy, curproxy);

  if (isttest(defproxy->server_id_hdr_name))
    curproxy->server_id_hdr_name = istdup(defproxy->server_id_hdr_name);

  /* initialize error relocations */
  if (!proxy_dup_default_conf_errors(curproxy, defproxy, &tmpmsg)) {
    memprintf(errmsg, "proxy '%s' : %s", curproxy->id, tmpmsg);
    free(tmpmsg);
    return 1;
  }

  if (curproxy->cap & PR_CAP_FE) {
    curproxy->maxconn = defproxy->maxconn;
    curproxy->backlog = defproxy->backlog;
    curproxy->fe_sps_lim = defproxy->fe_sps_lim;

    curproxy->to_log = defproxy->to_log & ~LW_COOKIE & ~LW_REQHDR & ~ LW_RSPHDR;
    curproxy->max_out_conns = defproxy->max_out_conns;

    curproxy->clitcpka_cnt   = defproxy->clitcpka_cnt;
    curproxy->clitcpka_idle  = defproxy->clitcpka_idle;
    curproxy->clitcpka_intvl = defproxy->clitcpka_intvl;
    curproxy->stream_new_from_sc = defproxy->stream_new_from_sc;
  }

  if (curproxy->cap & PR_CAP_BE) {
    curproxy->lbprm.algo = defproxy->lbprm.algo;
    curproxy->lbprm.hash_balance_factor = defproxy->lbprm.hash_balance_factor;
    curproxy->fullconn = defproxy->fullconn;
    curproxy->conn_retries = defproxy->conn_retries;
    curproxy->redispatch_after = defproxy->redispatch_after;
    curproxy->max_ka_queue = defproxy->max_ka_queue;

    curproxy->tcpcheck.flags = (defproxy->tcpcheck.flags & ~TCPCHK_FL_UNUSED_RS);
    curproxy->tcpcheck.rs  = defproxy->tcpcheck.rs;
    if (!dup_tcpcheck_vars(&curproxy->tcpcheck.preset_vars,
               &defproxy->tcpcheck.preset_vars)) {
      memprintf(errmsg, "proxy '%s': failed to duplicate tcpcheck preset-vars", curproxy->id);
      return 1;
    }

    curproxy->ck_opts = defproxy->ck_opts;

    if (defproxy->cookie_name)
      curproxy->cookie_name = strdup(defproxy->cookie_name);
    curproxy->cookie_len = defproxy->cookie_len;

    if (defproxy->dyncookie_key)
      curproxy->dyncookie_key = strdup(defproxy->dyncookie_key);
    if (defproxy->cookie_domain)
      curproxy->cookie_domain = strdup(defproxy->cookie_domain);

    if (defproxy->cookie_maxidle)
      curproxy->cookie_maxidle = defproxy->cookie_maxidle;

    if (defproxy->cookie_maxlife)
      curproxy->cookie_maxlife = defproxy->cookie_maxlife;

    if (defproxy->rdp_cookie_name)
      curproxy->rdp_cookie_name = strdup(defproxy->rdp_cookie_name);
    curproxy->rdp_cookie_len = defproxy->rdp_cookie_len;

    if (defproxy->cookie_attrs)
      curproxy->cookie_attrs = strdup(defproxy->cookie_attrs);

    if (defproxy->lbprm.arg_str)
      curproxy->lbprm.arg_str = strdup(defproxy->lbprm.arg_str);
    curproxy->lbprm.arg_len  = defproxy->lbprm.arg_len;
    curproxy->lbprm.arg_opt1 = defproxy->lbprm.arg_opt1;
    curproxy->lbprm.arg_opt2 = defproxy->lbprm.arg_opt2;
    curproxy->lbprm.arg_opt3 = defproxy->lbprm.arg_opt3;

    if (defproxy->conn_src.iface_name)
      curproxy->conn_src.iface_name = strdup(defproxy->conn_src.iface_name);
    curproxy->conn_src.iface_len = defproxy->conn_src.iface_len;
    curproxy->conn_src.opts = defproxy->conn_src.opts;
#if defined(CONFIG_HAP_TRANSPARENT)
    curproxy->conn_src.tproxy_addr = defproxy->conn_src.tproxy_addr;
#endif
    curproxy->load_server_state_from_file = defproxy->load_server_state_from_file;

    curproxy->srvtcpka_cnt   = defproxy->srvtcpka_cnt;
    curproxy->srvtcpka_idle  = defproxy->srvtcpka_idle;
    curproxy->srvtcpka_intvl = defproxy->srvtcpka_intvl;
  }

  if (curproxy->cap & PR_CAP_FE) {
    if (defproxy->capture_name)
      curproxy->capture_name = strdup(defproxy->capture_name);
    curproxy->capture_namelen = defproxy->capture_namelen;
    curproxy->capture_len = defproxy->capture_len;

    curproxy->nb_req_cap = defproxy->nb_req_cap;
    curproxy->req_cap = defproxy->req_cap;

    curproxy->nb_rsp_cap = defproxy->nb_rsp_cap;
    curproxy->rsp_cap = defproxy->rsp_cap;
  }

  if (curproxy->cap & PR_CAP_FE) {
    curproxy->timeout.client = defproxy->timeout.client;
    curproxy->timeout.client_hs = defproxy->timeout.client_hs;
    curproxy->timeout.clientfin = defproxy->timeout.clientfin;
    curproxy->timeout.tarpit = defproxy->timeout.tarpit;
    curproxy->timeout.httpreq = defproxy->timeout.httpreq;
    curproxy->timeout.httpka = defproxy->timeout.httpka;
    if (isttest(defproxy->monitor_uri))
      curproxy->monitor_uri = istdup(defproxy->monitor_uri);
    if (defproxy->defbe.name)
      curproxy->defbe.name = strdup(defproxy->defbe.name);

    lf_expr_dup(&defproxy->logformat, &curproxy->logformat);
    lf_expr_dup(&defproxy->logformat_sd, &curproxy->logformat_sd);
    lf_expr_dup(&defproxy->logformat_error, &curproxy->logformat_error);
  }

  if (curproxy->cap & PR_CAP_BE) {
    curproxy->timeout.connect = defproxy->timeout.connect;
    curproxy->timeout.server = defproxy->timeout.server;
    curproxy->timeout.serverfin = defproxy->timeout.serverfin;
    curproxy->timeout.check = defproxy->timeout.check;
    curproxy->timeout.queue = defproxy->timeout.queue;
    curproxy->timeout.tarpit = defproxy->timeout.tarpit;
    curproxy->timeout.httpreq = defproxy->timeout.httpreq;
    curproxy->timeout.httpka = defproxy->timeout.httpka;
    curproxy->timeout.tunnel = defproxy->timeout.tunnel;
    curproxy->conn_src.source_addr = defproxy->conn_src.source_addr;
  }

  curproxy->mode = defproxy->mode;

  /* for stats */
  stats_uri_auth_drop(curproxy->uri_auth);
  stats_uri_auth_take(defproxy->uri_auth);
  curproxy->uri_auth = defproxy->uri_auth;

  /* copy default loggers to curproxy */
  list_for_each_entry(tmplogger, &defproxy->loggers, list) {
    struct logger *node = dup_logger(tmplogger);

    if (!node) {
      memprintf(errmsg, "proxy '%s': out of memory", curproxy->id);
      return 1;
    }
    LIST_APPEND(&curproxy->loggers, &node->list);
  }

  lf_expr_dup(&defproxy->format_unique_id, &curproxy->format_unique_id);

  chunk_dup(&curproxy->log_tag, &defproxy->log_tag);

  /* copy default header unique id */
  if (isttest(defproxy->header_unique_id)) {
    const struct ist copy = istdup(defproxy->header_unique_id);

    if (!isttest(copy)) {
      memprintf(errmsg, "proxy '%s': out of memory for unique-id-header", curproxy->id);
      return 1;
    }
    curproxy->header_unique_id = copy;
  }

  /* default compression options */
  if (defproxy->comp != NULL) {
    curproxy->comp = calloc(1, sizeof(*curproxy->comp));
    if (!curproxy->comp) {
      memprintf(errmsg, "proxy '%s': out of memory for default compression options", curproxy->id);
      return 1;
    }
    curproxy->comp->algos_res = defproxy->comp->algos_res;
    curproxy->comp->algo_req = defproxy->comp->algo_req;
    curproxy->comp->types_res = defproxy->comp->types_res;
    curproxy->comp->types_req = defproxy->comp->types_req;
    curproxy->comp->minsize_res = defproxy->comp->minsize_res;
    curproxy->comp->minsize_req = defproxy->comp->minsize_req;
    curproxy->comp->flags = defproxy->comp->flags;
  }

  if (defproxy->check_path)
    curproxy->check_path = strdup(defproxy->check_path);
  if (defproxy->check_command)
    curproxy->check_command = strdup(defproxy->check_command);

  BUG_ON(curproxy->email_alert.flags & PR_EMAIL_ALERT_RESOLVED);
  if (defproxy->email_alert.mailers.name)
    curproxy->email_alert.mailers.name = strdup(defproxy->email_alert.mailers.name);
  if (defproxy->email_alert.from)
    curproxy->email_alert.from = strdup(defproxy->email_alert.from);
  if (defproxy->email_alert.to)
    curproxy->email_alert.to = strdup(defproxy->email_alert.to);
  if (defproxy->email_alert.myhostname)
    curproxy->email_alert.myhostname = strdup(defproxy->email_alert.myhostname);
  curproxy->email_alert.level = defproxy->email_alert.level;
  curproxy->email_alert.flags = defproxy->email_alert.flags;

  if (curproxy->cap & PR_CAP_FE) // don't inherit on backends
    curproxy->conf.log_steps = defproxy->conf.log_steps;

  return 0;
}

/* Allocates a new proxy <name> of type <cap> found at position <file:linenum>,
 * preset it from the defaults of <defproxy> and returns it. In case of error,
 * an alert is printed and NULL is returned.
 */
struct proxy *parse_new_proxy(const char *name, unsigned int cap,
                              const char *file, int linenum,
                              const struct proxy *defproxy)
{
  struct proxy *curproxy = NULL;
  char *errmsg = NULL;

  if (!(curproxy = alloc_new_proxy(name, cap, &errmsg))) {
    ha_alert("parsing [%s:%d] : %s\n", file, linenum, errmsg);
    free(errmsg);
    return NULL;
  }

  if (defproxy) {
    if (proxy_defproxy_cpy(curproxy, defproxy, &errmsg)) {
      ha_alert("parsing [%s:%d] : %s\n", file, linenum, errmsg);
      free(errmsg);

      proxy_drop(curproxy);
      return NULL;
    }
  }

  curproxy->conf.args.file = curproxy->conf.file = copy_file_name(file);
  curproxy->conf.args.line = curproxy->conf.line = linenum;

  return curproxy;
}

/* to be called under the proxy lock after pausing some listeners. This will
 * automatically update the p->flags flag
 */
void proxy_cond_pause(struct proxy *p)
{
  if (p->li_ready)
    return;
  p->flags |= PR_FL_PAUSED;
}

/* to be called under the proxy lock after resuming some listeners. This will
 * automatically update the p->flags flag
 */
void proxy_cond_resume(struct proxy *p)
{
  if (!p->li_ready)
    return;
  p->flags &= ~PR_FL_PAUSED;
}

/* to be called under the proxy lock after stopping some listeners. This will
 * automatically update the p->flags flag after stopping the last one, and
 * will emit a log indicating the proxy's condition. The function is idempotent
 * so that it will not emit multiple logs; a proxy will be disabled only once.
 */
void proxy_cond_disable(struct proxy *p)
{
  long long cum_conn = 0;
  long long cum_sess = 0;

  if (p->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
    return;

  if (p->li_ready + p->li_paused > 0)
    return;

  p->flags |= PR_FL_STOPPED;

  /* Note: syslog proxies use their own loggers so while it's somewhat OK
   * to report them being stopped as a warning, we must not spam their log
   * servers which are in fact production servers. For other types (CLI,
   * peers, etc) we must not report them at all as they're not really on
   * the data plane but on the control plane.
   */
  if (!(global.mode & MODE_STARTING)) {
    if (p->cap & PR_CAP_FE)
      cum_conn = COUNTERS_SHARED_TOTAL(p->fe_counters.shared.tg, cum_conn, HA_ATOMIC_LOAD);
    if (p->cap & PR_CAP_BE)
      cum_sess = COUNTERS_SHARED_TOTAL(p->be_counters.shared.tg, cum_sess, HA_ATOMIC_LOAD);
  }

  if ((p->mode == PR_MODE_TCP || p->mode == PR_MODE_HTTP || p->mode == PR_MODE_SYSLOG || p->mode == PR_MODE_SPOP) && !(p->cap & PR_CAP_INT))
    ha_warning("Proxy %s stopped (cumulated conns: FE: %lld, BE: %lld).\n",
         p->id, cum_conn, cum_sess);

  if ((p->mode == PR_MODE_TCP || p->mode == PR_MODE_HTTP || p->mode == PR_MODE_SPOP) && !(p->cap & PR_CAP_INT))
    send_log(p, LOG_WARNING, "Proxy %s stopped (cumulated conns: FE: %lld, BE: %lld).\n",
       p->id, cum_conn, cum_sess);

  if (p->table && p->table->size && p->table->sync_task)
    task_wakeup(p->table->sync_task, TASK_WOKEN_MSG);

  if (p->task)
    task_wakeup(p->task, TASK_WOKEN_MSG);
}

/*
 * This is the proxy management task. It enables proxies when there are enough
 * free streams, or stops them when the table is full. It is designed to be
 * called as a task which is woken up upon stopping or when rate limiting must
 * be enforced.
 */
struct task *manage_proxy(struct task *t, void *context, unsigned int state)
{
  struct proxy *p = context;
  int next = TICK_ETERNITY;
  unsigned int wait;

  /* We should periodically try to enable listeners waiting for a
   * global resource here.
   */

  /* If the proxy holds a stick table, we need to purge all unused
   * entries. These are all the ones in the table with ref_cnt == 0
   * and all the ones in the pool used to allocate new entries. Any
   * entry attached to an existing stream waiting for a store will
   * be in neither list. Any entry being dumped will have ref_cnt > 0.
   * However we protect tables that are being synced to peers.
   */
  if (unlikely(stopping && (p->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) && p->table && p->table->current)) {

    if (!p->table->refcnt) {
      /* !table->refcnt means there
       * is no more pending full resync
       * to push to a new process and
       * we are free to flush the table.
       */
      int cleaned_up;

      /* We purposely enforce a budget limitation since we don't want
       * to spend too much time purging old entries
       *
       * This is known to cause the watchdog to occasionnaly trigger if
       * the table is huge and all entries become available for purge
       * at the same time
       *
       * Moreover, we must also anticipate the pool_gc() call which
       * will also be much slower if there is too much work at once
       */
      cleaned_up = stktable_trash_oldest(p->table);
      if (cleaned_up) {
        /* immediately release freed memory since we are stopping */
        pool_gc(NULL);
        if (cleaned_up) {
          /* it is very likely that there are still trashable
           * entries in the table, reschedule a new cleanup
           * attempt ASAP
           */
          t->expire = TICK_ETERNITY;
          task_wakeup(t, TASK_WOKEN_RES);
          return t;
        }
      }
    }
    if (p->table->current) {
      /* some entries still remain but are not yet available
       * for cleanup, let's recheck in one second
       */
      next = tick_first(next, tick_add(now_ms, 1000));
    }
  }

  /* the rest below is just for frontends */
  if (!(p->cap & PR_CAP_FE))
    goto out;

  /* check the various reasons we may find to block the frontend */
  if (unlikely(p->feconn >= p->maxconn))
    goto out;

  if (p->fe_sps_lim &&
      (wait = COUNTERS_SHARED_TOTAL_ARG2(p->fe_counters.shared.tg, sess_per_sec, next_event_delay, p->fe_sps_lim, 0))) {

    /* we're blocking because a limit was reached on the number of
     * requests/s on the frontend. We want to re-check ASAP, which
     * means in 1 ms before estimated expiration date, because the
     * timer will have settled down.
     */
    next = tick_first(next, tick_add(now_ms, wait));
    goto out;
  }

  /* The proxy is not limited so we can re-enable any waiting listener */
  dequeue_proxy_listeners(p, 0);
 out:
  t->expire = next;
  task_queue(t);
  return t;
}


static int proxy_parse_grace(char **args, int section_type, struct proxy *curpx,
                             const struct proxy *defpx, const char *file, int line,
                             char **err)
{
  const char *res;

  if (!*args[1]) {
    memprintf(err, "'%s' expects <time> as argument.\n", args[0]);
    return -1;
  }
  res = parse_time_err(args[1], &global.grace_delay, TIME_UNIT_MS);
  if (res == PARSE_TIME_OVER) {
    memprintf(err, "timer overflow in argument '%s' to '%s' (maximum value is 2147483647 ms or ~24.8 days)",
        args[1], args[0]);
    return -1;
  }
  else if (res == PARSE_TIME_UNDER) {
    memprintf(err, "timer underflow in argument '%s' to '%s' (minimum non-null value is 1 ms)",
        args[1], args[0]);
    return -1;
  }
  else if (res) {
    memprintf(err, "unexpected character '%c' in argument to <%s>.\n", *res, args[0]);
    return -1;
  }
  return 0;
}

static int proxy_parse_hard_stop_after(char **args, int section_type, struct proxy *curpx,
                                const struct proxy *defpx, const char *file, int line,
                                char **err)
{
  const char *res;

  if (!*args[1]) {
    memprintf(err, "'%s' expects <time> as argument.\n", args[0]);
    return -1;
  }
  res = parse_time_err(args[1], &global.hard_stop_after, TIME_UNIT_MS);
  if (res == PARSE_TIME_OVER) {
    memprintf(err, "timer overflow in argument '%s' to '%s' (maximum value is 2147483647 ms or ~24.8 days)",
        args[1], args[0]);
    return -1;
  }
  else if (res == PARSE_TIME_UNDER) {
    memprintf(err, "timer underflow in argument '%s' to '%s' (minimum non-null value is 1 ms)",
        args[1], args[0]);
    return -1;
  }
  else if (res) {
    memprintf(err, "unexpected character '%c' in argument to <%s>.\n", *res, args[0]);
    return -1;
  }
  return 0;
}

static int proxy_parse_close_spread_time(char **args, int section_type, struct proxy *curpx,
           const struct proxy *defpx, const char *file, int line,
           char **err)
{
  const char *res;

  if (!*args[1]) {
    memprintf(err, "'%s' expects <time> as argument.\n", args[0]);
    return -1;
  }

  /* If close-spread-time is set to "infinite", disable the active connection
   * closing during soft-stop.
   */
  if (strcmp(args[1], "infinite") == 0) {
    global.tune.options |= GTUNE_DISABLE_ACTIVE_CLOSE;
    global.close_spread_time = TICK_ETERNITY;
    return 0;
  }

  res = parse_time_err(args[1], &global.close_spread_time, TIME_UNIT_MS);
  if (res == PARSE_TIME_OVER) {
    memprintf(err, "timer overflow in argument '%s' to '%s' (maximum value is 2147483647 ms or ~24.8 days)",
        args[1], args[0]);
    return -1;
  }
  else if (res == PARSE_TIME_UNDER) {
    memprintf(err, "timer underflow in argument '%s' to '%s' (minimum non-null value is 1 ms)",
        args[1], args[0]);
    return -1;
  }
  else if (res) {
    memprintf(err, "unexpected character '%c' in argument to <%s>.\n", *res, args[0]);
    return -1;
  }
  global.tune.options &= ~GTUNE_DISABLE_ACTIVE_CLOSE;

  return 0;
}

struct task *hard_stop(struct task *t, void *context, unsigned int state)
{
  struct proxy *p;
  struct stream *s;
  int thr;

  if (killed) {
    ha_warning("Some tasks resisted to hard-stop, exiting now.\n");
    send_log(NULL, LOG_WARNING, "Some tasks resisted to hard-stop, exiting now.\n");
    killed = 2;
    for (thr = 0; thr < global.nbthread; thr++)
      if (_HA_ATOMIC_LOAD(&ha_thread_info[thr].tg->threads_enabled) & ha_thread_info[thr].ltid_bit)
        wake_thread(thr);
    t->expire = TICK_ETERNITY;
    return t;
  }

  ha_warning("soft-stop running for too long, performing a hard-stop.\n");
  send_log(NULL, LOG_WARNING, "soft-stop running for too long, performing a hard-stop.\n");
  list_for_each_entry(p, &main_proxies, el) {
    if ((p->cap & PR_CAP_FE) && (p->feconn > 0)) {
      ha_warning("Proxy %s hard-stopped (%d remaining conns will be closed).\n",
           p->id, p->feconn);
      send_log(p, LOG_WARNING, "Proxy %s hard-stopped (%d remaining conns will be closed).\n",
        p->id, p->feconn);
    }
  }

  thread_isolate();

  for (thr = 0; thr < global.nbthread; thr++) {
    list_for_each_entry(s, &ha_thread_ctx[thr].streams, list) {
      stream_shutdown(s, SF_ERR_KILLED);
    }
  }

  thread_release();

  killed = 1;
  t->expire = tick_add(now_ms, MS_TO_TICKS(1000));
  return t;
}

/* perform the soft-stop right now (i.e. unbind listeners) */
static void do_soft_stop_now()
{
  struct proxy *p;
  struct task *task;

  /* disable busy polling to avoid cpu eating for the new process */
  global.tune.options &= ~GTUNE_BUSY_POLLING;

  if (tick_isset(global.close_spread_time)) {
    global.close_spread_end = tick_add(now_ms, global.close_spread_time);
  }

  /* schedule a hard-stop after a delay if needed */
  if (tick_isset(global.hard_stop_after)) {
    task = task_new_anywhere();
    if (task) {
      task->process = hard_stop;
      task_schedule(task, tick_add(now_ms, global.hard_stop_after));
    }
    else {
      ha_alert("out of memory trying to allocate the hard-stop task.\n");
    }
  }

  /* we isolate so that we have a chance of stopping listeners in other groups */
  thread_isolate();

  /* stop all stoppable listeners */
  protocol_stop_now();

  thread_release();

  /* Loop on proxies to stop backends */
  list_for_each_entry(p, &main_proxies, el) {
    HA_RWLOCK_WRLOCK(PROXY_LOCK, &p->lock);
    proxy_cond_disable(p);
    HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &p->lock);
  }

  /* signal zero is used to broadcast the "stopping" event */
  signal_handler(0);
}

/* triggered by a soft-stop delayed with `grace` */
static struct task *grace_expired(struct task *t, void *context, unsigned int state)
{
  ha_notice("Grace period expired, proceeding with soft-stop now.\n");
  send_log(NULL, LOG_NOTICE, "Grace period expired, proceeding with soft-stop now.\n");
  do_soft_stop_now();
  task_destroy(t);
  return NULL;
}

/*
 * this function disables health-check servers so that the process will quickly be ignored
 * by load balancers.
 */
void soft_stop(void)
{
  struct task *task;

  stopping = 1;

  if (tick_isset(global.grace_delay)) {
    task = task_new_anywhere();
    if (task) {
      ha_notice("Scheduling a soft-stop in %u ms.\n", global.grace_delay);
      send_log(NULL, LOG_WARNING, "Scheduling a soft-stop in %u ms.\n", global.grace_delay);
      task->process = grace_expired;
      task_schedule(task, tick_add(now_ms, global.grace_delay));
      return;
    }
    else {
      ha_alert("out of memory trying to allocate the stop-stop task, stopping now.\n");
    }
  }

  /* no grace (or failure to enforce it): stop now */
  do_soft_stop_now();
}


/* Temporarily disables listening on all of the proxy's listeners. Upon
 * success, the proxy enters the PR_PAUSED state. The function returns 0
 * if it fails, or non-zero on success.
 * The function takes the proxy's lock so it's safe to
 * call from multiple places.
 */
int pause_proxy(struct proxy *p)
{
  struct listener *l;

  HA_RWLOCK_WRLOCK(PROXY_LOCK, &p->lock);

  if (!(p->cap & PR_CAP_FE) || (p->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) || !p->li_ready)
    goto end;

  list_for_each_entry(l, &p->conf.listeners, by_fe)
    suspend_listener(l, 1, 0);

  if (p->li_ready && !tg_agents_enabled) {
    ha_warning("%s %s failed to enter pause mode.\n", proxy_cap_str(p->cap), p->id);
    send_log(p, LOG_WARNING, "%s %s failed to enter pause mode.\n", proxy_cap_str(p->cap), p->id);
    HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &p->lock);
    return 0;
  }
end:
  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &p->lock);
  return 1;
}

/*
 * This function completely stops a proxy and releases its listeners. It has
 * to be called when going down in order to release the ports so that another
 * process may bind to them. It must also be called on disabled proxies at the
 * end of start-up. If all listeners are closed, the proxy is set to the
 * PR_STOPPED state.
 * The function takes the proxy's lock so it's safe to
 * call from multiple places.
 */
void stop_proxy(struct proxy *p)
{
  struct listener *l;

  HA_RWLOCK_WRLOCK(PROXY_LOCK, &p->lock);

  list_for_each_entry(l, &p->conf.listeners, by_fe)
    stop_listener(l, 1, 0, 0);

  if (!(p->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) && !p->li_ready) {
    /* might be just a backend */
    p->flags |= PR_FL_STOPPED;
  }

  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &p->lock);
}

/* This function resumes listening on the specified proxy. It scans all of its
 * listeners and tries to enable them all. If any of them fails, the proxy is
 * put back to the paused state. It returns 1 upon success, or zero if an error
 * is encountered.
 * The function takes the proxy's lock so it's safe to
 * call from multiple places.
 */
int resume_proxy(struct proxy *p)
{
  struct listener *l;
  int fail;

  HA_RWLOCK_WRLOCK(PROXY_LOCK, &p->lock);

  if ((p->flags & (PR_FL_DISABLED|PR_FL_STOPPED)) || !p->li_paused)
    goto end;

  fail = 0;
  list_for_each_entry(l, &p->conf.listeners, by_fe) {
    if (!resume_listener(l, 1, 0)) {
      int port;

      port = get_host_port(&l->rx.addr);
      if (port) {
        ha_warning("Port %d busy while trying to enable %s %s.\n",
             port, proxy_cap_str(p->cap), p->id);
        send_log(p, LOG_WARNING, "Port %d busy while trying to enable %s %s.\n",
           port, proxy_cap_str(p->cap), p->id);
      }
      else {
        ha_warning("Bind on socket %d busy while trying to enable %s %s.\n",
             l->luid, proxy_cap_str(p->cap), p->id);
        send_log(p, LOG_WARNING, "Bind on socket %d busy while trying to enable %s %s.\n",
           l->luid, proxy_cap_str(p->cap), p->id);
      }

      /* Another port might have been enabled. Let's stop everything. */
      fail = 1;
      break;
    }
  }

  if (fail) {
    HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &p->lock);
    /* pause_proxy will take PROXY_LOCK */
    pause_proxy(p);
    return 0;
  }
end:
  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &p->lock);
  return 1;
}

/* Set current stream's backend to <be>. Nothing is done if the
 * stream already had a backend assigned, which is indicated by
 * s->flags & SF_BE_ASSIGNED.
 * All flags, stats and counters which need be updated are updated.
 * Returns 1 if done, 0 in case of internal error, eg: lack of resource.
 */
int stream_set_backend(struct stream *s, struct proxy *be)
{
  unsigned int req_ana;
  unsigned int beconn;

  if (s->flags & SF_BE_ASSIGNED)
    return 1;

  if (flt_set_stream_backend(s, be) < 0)
    return 0;

  s->be = be;
  if (be->be_counters.shared.tg)
    s->be_tgcounters = be->be_counters.shared.tg[tgid - 1];
  else
    s->be_tgcounters = NULL;

  beconn = HA_ATOMIC_ADD_FETCH(&be->beconn, 1);
  COUNTERS_UPDATE_MAX(&be->be_counters.conn_max, beconn);
  proxy_inc_be_ctr(be);

  /* assign new parameters to the stream from the new backend */
  s->scb->flags &= ~SC_FL_INDEP_STR;
  if (be->options2 & PR_O2_INDEPSTR)
    s->scb->flags |= SC_FL_INDEP_STR;

  /* We want to enable the backend-specific analysers except those which
   * were already run as part of the frontend/listener. Note that it would
   * be more reliable to store the list of analysers that have been run,
   * but what we do here is OK for now.
   */
  req_ana = be->be_req_ana;
  if (!(strm_fe(s)->options & PR_O_WREQ_BODY) && be->options & PR_O_WREQ_BODY) {
    /* The backend request to parse a request body while it was not
     * performed on the frontend, so add the corresponding analyser
     */
    req_ana |= AN_REQ_HTTP_BODY;
  }
  if (IS_HTX_STRM(s) && strm_fe(s)->mode != PR_MODE_HTTP) {
    /* The stream was already upgraded to HTTP, so remove analysers
     * set during the upgrade
     */
    req_ana &= ~(AN_REQ_WAIT_HTTP|AN_REQ_HTTP_PROCESS_FE);
  }
  s->req.analysers |= req_ana & ~(strm_li(s) ? strm_li(s)->bind_conf->analysers : 0);

  if (!IS_HTX_STRM(s) && be->mode == PR_MODE_HTTP) {
    /* If we chain a TCP frontend to an HTX backend, we must upgrade
     * the client mux */
    if (!stream_set_http_mode(s, NULL))
      return 0;
  }
  else if (IS_HTX_STRM(s) && be->mode != PR_MODE_HTTP) {
    /* If a TCP backend is assgiend to an HTX stream, return an
     * error. It may happens for a new stream on a previously
     * upgraded connections. */
    if (!(s->flags & SF_ERR_MASK))
      s->flags |= SF_ERR_INTERNAL;
    return 0;
  }
  else {
    /* If the target backend requires HTTP processing, we have to allocate
     * the HTTP transaction if we did not have one.
     */
    if (unlikely(!s->txn.http && be->http_needed && !http_create_txn(s)))
      return 0;
  }

  s->flags |= SF_BE_ASSIGNED;
  if (be->options2 & PR_O2_NODELAY) {
    s->scf->flags |= SC_FL_SND_NEVERWAIT;
    s->scb->flags |= SC_FL_SND_NEVERWAIT;
  }

  return 1;
}

/* Capture a bad request or response and archive it in the proxy's structure.
 * It is relatively protocol-agnostic so it requires that a number of elements
 * are passed :
 *  - <proxy> is the proxy where the error was detected and where the snapshot
 *    needs to be stored
 *  - <is_back> indicates that the error happened when receiving the response
 *  - <other_end> is a pointer to the proxy on the other side when known
 *  - <target> is the target of the connection, usually a server or a proxy
 *  - <sess> is the session which experienced the error
 *  - <ctx> may be NULL or should contain any info relevant to the protocol
 *  - <buf> is the buffer containing the offending data
 *  - <buf_ofs> is the position of this buffer's input data in the input
 *    stream, starting at zero. It may be passed as zero if unknown.
 *  - <buf_out> is the portion of <buf->data> which was already forwarded and
 *    which precedes the buffer's input. The buffer's input starts at
 *    buf->head + buf_out.
 *  - <err_pos> is the pointer to the faulty byte in the buffer's input.
 *  - <show> is the callback to use to display <ctx>. It may be NULL.
 */
void proxy_capture_error(struct proxy *proxy, int is_back,
       struct proxy *other_end, enum obj_type *target,
       const struct session *sess,
       const struct buffer *buf, long buf_ofs,
       unsigned int buf_out, unsigned int err_pos,
       const union error_snapshot_ctx *ctx,
       void (*show)(struct buffer *, const struct error_snapshot *))
{
  struct error_snapshot *es;
  unsigned int buf_len;
  int len1, len2;
  unsigned int ev_id;

  ev_id = HA_ATOMIC_FETCH_ADD(&error_snapshot_id, 1);

  buf_len = b_data(buf) - buf_out;

  es = malloc(sizeof(*es) + buf_len);
  if (!es)
    return;

  es->buf_size = buf->size;
  es->buf_len = buf_len;
  es->ev_id   = ev_id;

  len1 = b_size(buf) - b_peek_ofs(buf, buf_out);
  if (len1 > buf_len)
    len1 = buf_len;

  if (len1) {
    memcpy(es->buf, b_peek(buf, buf_out), len1);
    len2 = buf_len - len1;
    if (len2)
      memcpy(es->buf + len1, b_orig(buf), len2);
  }

  es->buf_err = err_pos;
  es->when    = date; // user-visible date
  es->srv     = objt_server(target);
  es->oe      = other_end;
  if (sess && objt_conn(sess->origin) && conn_get_src(__objt_conn(sess->origin)))
    es->src  = *__objt_conn(sess->origin)->src;
  else
    memset(&es->src, 0, sizeof(es->src));

  es->buf_wrap = b_wrap(buf) - b_peek(buf, buf_out);
  es->buf_out  = buf_out;
  es->buf_ofs  = buf_ofs;

  /* be sure to indicate the offset of the first IN byte */
  if (es->buf_ofs >= es->buf_len)
    es->buf_ofs -= es->buf_len;
  else
    es->buf_ofs = 0;

  /* protocol-specific part now */
  if (ctx)
    es->ctx = *ctx;
  else
    memset(&es->ctx, 0, sizeof(es->ctx));
  es->show = show;

  /* note: we still lock since we have to be certain that nobody is
   * dumping the output while we free.
   */
  HA_RWLOCK_WRLOCK(PROXY_LOCK, &proxy->lock);
  if (is_back) {
    es = HA_ATOMIC_XCHG(&proxy->invalid_rep, es);
  } else {
    es = HA_ATOMIC_XCHG(&proxy->invalid_req, es);
  }
  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &proxy->lock);
  ha_free(&es);
}

/* Configure all proxies which lack a maxconn setting to use the global one by
 * default. This avoids the common mistake consisting in setting maxconn only
 * in the global section and discovering the hard way that it doesn't propagate
 * through the frontends. These values are also propagated through the various
 * targeted backends, whose fullconn is finally calculated if not yet set.
 */
void proxy_adjust_all_maxconn()
{
  struct proxy *curproxy;
  struct switching_rule *swrule1, *swrule2;

  list_for_each_entry(curproxy, &main_proxies, el) {
    if (curproxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
      continue;

    if (!(curproxy->cap & PR_CAP_FE))
      continue;

    if (!curproxy->maxconn)
      curproxy->maxconn = global.maxconn;

    /* update the target backend's fullconn count : default_backend */
    if (curproxy->defbe.be)
      curproxy->defbe.be->tot_fe_maxconn += curproxy->maxconn;
    else if ((curproxy->cap & PR_CAP_LISTEN) == PR_CAP_LISTEN)
      curproxy->tot_fe_maxconn += curproxy->maxconn;

    list_for_each_entry(swrule1, &curproxy->switching_rules, list) {
      /* For each target of switching rules, we update their
       * tot_fe_maxconn, except if a previous rule points to
       * the same backend or to the default backend.
       */
      if (swrule1->be.backend != curproxy->defbe.be) {
        /* note: swrule1->be.backend isn't a backend if the rule
         * is dynamic, it's an expression instead, so it must not
         * be dereferenced as a backend before being certain it is.
         */
        list_for_each_entry(swrule2, &curproxy->switching_rules, list) {
          if (swrule2 == swrule1) {
            if (!swrule1->dynamic)
              swrule1->be.backend->tot_fe_maxconn += curproxy->maxconn;
            break;
          }
          else if (!swrule2->dynamic && swrule2->be.backend == swrule1->be.backend) {
            /* there are multiple refs of this backend */
            break;
          }
        }
      }
    }
  }

  /* automatically compute fullconn if not set. We must not do it in the
   * loop above because cross-references are not yet fully resolved.
   */
  list_for_each_entry(curproxy, &main_proxies, el) {
    if (curproxy->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
      continue;

    /* If <fullconn> is not set, let's set it to 10% of the sum of
     * the possible incoming frontend's maxconns.
     */
    if (!curproxy->fullconn && (curproxy->cap & PR_CAP_BE)) {
      /* we have the sum of the maxconns in <total>. We only
       * keep 10% of that sum to set the default fullconn, with
       * a hard minimum of 1 (to avoid a divide by zero).
       */
      curproxy->fullconn = (curproxy->tot_fe_maxconn + 9) / 10;
      if (!curproxy->fullconn)
        curproxy->fullconn = 1;
    }
  }
}

/* releases what's no longer needed after a proxy section covering <curproxy>.
 * Returns an error code made of ERR_*, or 0 on success.
 */
static int post_section_px_cleanup()
{
  if (!curproxy)
    return 0; // nothing to do

  /* Perform clean up of empty default-server in proxies. This is not
   * executed for defaults section as this may still be useful.
   */
  if ((curproxy->cap & PR_CAP_LISTEN) && !(curproxy->cap & PR_CAP_DEF)) {
    /* Unnamed default-server is removed if it does not define specific setting. */
    if (curproxy->defsrv && !(curproxy->defsrv->flags & SRV_F_UMODIFIED)) {
      srv_free_params(curproxy->defsrv);
      srv_free(&curproxy->defsrv);
    }
  }
  return 0;
}

REGISTER_CONFIG_POST_SECTION("frontend", post_section_px_cleanup);
REGISTER_CONFIG_POST_SECTION("backend",  post_section_px_cleanup);
REGISTER_CONFIG_POST_SECTION("listen",   post_section_px_cleanup);
REGISTER_CONFIG_POST_SECTION("defaults", post_section_px_cleanup);

/* Config keywords below */

static struct cfg_kw_list cfg_kws = {ILH, {
  { CFG_GLOBAL, "grace", proxy_parse_grace },
  { CFG_GLOBAL, "hard-stop-after", proxy_parse_hard_stop_after },
  { CFG_GLOBAL, "close-spread-time", proxy_parse_close_spread_time },
  { CFG_LISTEN, "timeout", proxy_parse_timeout },
  { CFG_LISTEN, "clitimeout", proxy_parse_timeout }, /* This keyword actually fails to parse, this line remains for better error messages. */
  { CFG_LISTEN, "contimeout", proxy_parse_timeout }, /* This keyword actually fails to parse, this line remains for better error messages. */
  { CFG_LISTEN, "srvtimeout", proxy_parse_timeout }, /* This keyword actually fails to parse, this line remains for better error messages. */
  { CFG_LISTEN, "rate-limit", proxy_parse_rate_limit },
  { CFG_LISTEN, "max-keep-alive-queue", proxy_parse_max_ka_queue },
  { CFG_LISTEN, "declare", proxy_parse_declare },
  { CFG_LISTEN, "retry-on", proxy_parse_retry_on },
  { CFG_LISTEN, "hash-preserve-affinity", proxy_parse_hash_preserve_affinity },
#ifdef TCP_KEEPCNT
  { CFG_LISTEN, "clitcpka-cnt", proxy_parse_tcpka_cnt },
  { CFG_LISTEN, "srvtcpka-cnt", proxy_parse_tcpka_cnt },
#endif
#ifdef TCP_KEEPIDLE
  { CFG_LISTEN, "clitcpka-idle", proxy_parse_tcpka_idle },
  { CFG_LISTEN, "srvtcpka-idle", proxy_parse_tcpka_idle },
#endif
#ifdef TCP_KEEPINTVL
  { CFG_LISTEN, "clitcpka-intvl", proxy_parse_tcpka_intvl },
  { CFG_LISTEN, "srvtcpka-intvl", proxy_parse_tcpka_intvl },
#endif
  { CFG_LISTEN, "be-unpublished", proxy_parse_be_unpublished },
  { CFG_LISTEN, "force-be-switch", proxy_parse_force_be_switch },
  { CFG_LISTEN, "guid", proxy_parse_guid },
  { 0, NULL, NULL },
}};

INITCALL1(STG_REGISTER, cfg_register_keywords, &cfg_kws);

/* Expects to find a frontend named <arg> and returns it, otherwise displays various
 * adequate error messages and returns NULL. This function is designed to be used by
 * functions requiring a frontend on the CLI.
 */
struct proxy *cli_find_frontend(struct appctx *appctx, const char *arg)
{
  struct proxy *px;

  if (!*arg) {
    cli_err(appctx, "A frontend name is expected.\n");
    return NULL;
  }

  px = proxy_fe_by_name(arg);
  if (!px) {
    cli_err(appctx, "No such frontend.\n");
    return NULL;
  }
  return px;
}

/* Expects to find a backend named <arg> and returns it, otherwise displays various
 * adequate error messages and returns NULL. This function is designed to be used by
 * functions requiring a frontend on the CLI.
 */
struct proxy *cli_find_backend(struct appctx *appctx, const char *arg)
{
  struct proxy *px;

  if (!*arg) {
    cli_err(appctx, "A backend name is expected.\n");
    return NULL;
  }

  px = proxy_be_by_name(arg);
  if (!px) {
    cli_err(appctx, "No such backend.\n");
    return NULL;
  }
  return px;
}

/* Parser for "show default-server [<backend>] command.
 * Returns 0 unless a requested backend is unknown.
 */
static int cli_parse_show_default_server(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct show_be_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));

  /* Watch proxies list as backends may be deleted during iteration. No
   * need to watch for servers as default-server instances cannot be
   * removed.
   */
  watcher_init(&ctx->px_watch, &ctx->px, offsetof(struct proxy, watcher_list));

  /* check if a backend name has been provided */
  if (*args[2]) {
    ctx->px = proxy_be_by_name(args[2]);
    if (!ctx->px)
      return cli_err(appctx, "Can't find backend.\n");
  }
  else {
    /* Only attach the watcher if full iteration is requested. */
    watcher_attach(&ctx->px_watch, main_proxies_first());
  }

  return 0;
}

/* Handler for "show default-server [<backend>] command.
 * Returns 1 on completion or 0 to yield due to output blocked.
 */
static int cli_io_handler_show_default_server(struct appctx *appctx)
{
  struct show_be_ctx *ctx = appctx->svcctx;
  struct server *defsrv;
  int prefix;

  for (; ctx->px; watcher_next(&ctx->px_watch, main_proxies_next(ctx->px))) {
    chunk_reset(&trash);
    prefix = 1;

    /* servers are only in backends */
    if ((ctx->px->cap & PR_CAP_BE) && !(ctx->px->cap & PR_CAP_INT)) {
      /* Dump unnamed default-server if allocated. */
      if (ctx->px->defsrv) {
        chunk_appendf(&trash, "* %s\n", ctx->px->id);
        prefix = 0;
      }

      /* Dump named default-server instances. */
      for (defsrv = cebuis_item_first(&ctx->px->defsrv_by_name, conf.name_node, id, struct server);
           defsrv; defsrv = cebuis_item_next(&ctx->px->defsrv_by_name, conf.name_node, id, defsrv)) {
        chunk_appendf(&trash, "%s %s/%s\n",
                      prefix ? "*" : " ", ctx->px->id, defsrv->id);
        prefix = 0;
      }

      if (STRESS_RUN1(applet_putchk_stress(appctx, &trash) == -1,
                      applet_putchk(appctx, &trash) == -1)) {
        return 0;
      }
    }

    /* Watcher is not attached if a specific backend has been requested. */
    if (!watcher_is_attached(&ctx->px_watch))
      break;
  }

  return 1;
}

/* release handler for "show default-server" */
static void cli_io_release_show_default_server(struct appctx *appctx)
{
  struct show_be_ctx *ctx = appctx->svcctx;
  watcher_detach(&ctx->px_watch);
}

/* Handler for "show defaults" command. */
static int cli_io_handler_show_defaults(struct appctx *appctx)
{
  struct show_be_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));

  if (!ctx->px) {
    /* No need to use ctx <px_watch> as defaults proxies cannot be removed at runtime. */
    ctx->px = !LIST_ISEMPTY(&defaults_list) ?
      LIST_ELEM(defaults_list.n, struct proxy *, el) : NULL;
  }

  while (ctx->px) {
    chunk_reset(&trash);
    chunk_appendf(&trash, "%s\n", ctx->px->id);

    if (STRESS_RUN1(applet_putchk_stress(appctx, &trash) == -1,
                    applet_putchk(appctx, &trash) == -1)) {
      return 0;
    }

    if (ctx->px->el.n == &defaults_list)
      break;
    ctx->px = LIST_ELEM(ctx->px->el.n, struct proxy *, el);
  }

  return 1;
}

/* parse a "show servers [state|conn]" CLI line, returns 0 if it wants to start
 * the dump or 1 if it stops immediately. If an argument is specified, it will
 * reserve a show_srv_ctx context and set the proxy pointer into ->px, its ID
 * into ->only_pxid, and ->show_conn to 0 for "state", or 1 for "conn".
 */
static int cli_parse_show_servers(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct show_srv_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));
  struct proxy *px;

  ctx->show_conn = *args[2] == 'c'; // "conn" vs "state"

  watcher_init(&ctx->px_watch,  &ctx->px, offsetof(struct proxy,  watcher_list));
  watcher_init(&ctx->srv_watch, &ctx->sv, offsetof(struct server, watcher_list));

  /* check if a backend name has been provided */
  if (*args[3]) {
    /* read server state from local file */
    px = proxy_be_by_name(args[3]);

    if (!px)
      return cli_err(appctx, "Can't find backend.\n");

    watcher_attach(&ctx->px_watch, px);
    ctx->only_pxid = px->uuid;
  }
  return 0;
}

/* helper to dump server addr */
static void dump_server_addr(const struct sockaddr_storage *addr, char *addr_str)
{
  addr_str[0] = '\0';
  switch (addr->ss_family) {
    case AF_INET:
    case AF_INET6:
      addr_to_str(addr, addr_str, INET6_ADDRSTRLEN + 1);
      break;
    default:
      memcpy(addr_str, "-\0", 2);
      break;
  }
}

/* dumps server state information for all the servers found in backend cli.p0.
 * These information are all the parameters which may change during HAProxy runtime.
 * By default, we only export to the last known server state file format. These
 * information can be used at next startup to recover same level of server
 * state. It takes its context from show_srv_ctx, with the proxy pointer from
 * ->px, the proxy's id ->only_pxid, the server's pointer from ->sv, and the
 * choice of what to dump from ->show_conn.
 */
static int dump_servers_state(struct appctx *appctx)
{
  struct show_srv_ctx *ctx = appctx->svcctx;
  struct proxy *px = ctx->px;
  struct server *srv;
  char srv_addr[INET6_ADDRSTRLEN + 1];
  char srv_agent_addr[INET6_ADDRSTRLEN + 1];
  char srv_check_addr[INET6_ADDRSTRLEN + 1];
  time_t srv_time_since_last_change;
  int bk_f_forced_id, srv_f_forced_id;
  char *srvrecord;

  if (!ctx->sv)
    watcher_attach(&ctx->srv_watch, proxy_first_server(px));

  for (; ctx->sv; watcher_next(&ctx->srv_watch, proxy_next_server(ctx->sv))) {
    srv = ctx->sv;

    dump_server_addr(&srv->addr, srv_addr);
    dump_server_addr(&srv->check.addr, srv_check_addr);
    dump_server_addr(&srv->agent.addr, srv_agent_addr);

    srv_time_since_last_change = ns_to_sec(now_ns) - srv->last_change;
    bk_f_forced_id = px->options & PR_O_FORCED_ID ? 1 : 0;
    srv_f_forced_id = srv->flags & SRV_F_FORCED_ID ? 1 : 0;

    srvrecord = NULL;
    if (srv->srvrq && srv->srvrq->name)
      srvrecord = srv->srvrq->name;

    if (ctx->show_conn == 0) {
      /* show servers state */
      chunk_printf(&trash,
                   "%d %s "
                   "%d %s %s "
                   "%d %d %d %d %ld "
                   "%d %d %d %d %d "
                   "%d %d %s %u "
             "%s %d %d "
             "%s %s %d"
                   "\n",
                   px->uuid, HA_ANON_CLI(px->id),
                   srv->puid, HA_ANON_CLI(srv->id),
             hash_ipanon(appctx->cli_ctx.anon_key, srv_addr, 0),
                   srv->cur_state, srv->cur_admin, srv->uweight, srv->iweight,
             (long int)srv_time_since_last_change,
                   srv->check.status, srv->check.result, srv->check.health,
             srv->check.state & 0x0F, srv->agent.state & 0x1F,
                   bk_f_forced_id, srv_f_forced_id,
             srv->hostname ? HA_ANON_CLI(srv->hostname) : "-", srv->svc_port,
                   srvrecord ? srvrecord : "-", srv->use_ssl, srv->check.port,
             srv_check_addr, srv_agent_addr, srv->agent.port);
    } else {
      /* show servers conn */
      int thr;

      chunk_printf(&trash,
                   "%s/%s %d/%d %s %u - %u %u %u %u %u %u %u %u %d %u",
                   HA_ANON_CLI(px->id), HA_ANON_CLI(srv->id),
                   px->uuid, srv->puid, hash_ipanon(appctx->cli_ctx.anon_key, srv_addr, 0),
                   srv->svc_port, srv->pool_purge_delay,
                   srv->served,
                   srv->curr_used_conns, srv->max_used_conns, srv->est_need_conns,
                   srv->curr_sess_idle_conns,
                   srv->curr_idle_nb, srv->curr_safe_nb, (int)srv->max_idle_conns, srv->curr_idle_conns);

      for (thr = 0; thr < global.nbthread && srv->curr_idle_thr; thr++)
        chunk_appendf(&trash, " %u", srv->curr_idle_thr[thr]);

      chunk_appendf(&trash, "\n");
    }

    if (STRESS_RUN1(applet_putchk_stress(appctx, &trash) == -1,
                    applet_putchk(appctx, &trash) == -1)) {
      return 0;
    }
  }
  return 1;
}

/* Parses backend list or simply use backend name provided by the user to return
 * states of servers to stdout. It takes its context from show_srv_ctx and dumps
 * proxy ->px and stops if ->only_pxid is non-null.
 */
static int cli_io_handler_servers_state(struct appctx *appctx)
{
  struct show_srv_ctx *ctx = appctx->svcctx;
  struct proxy *curproxy;

  if (ctx->state == SHOW_SRV_HEAD) {
    if (ctx->show_conn == 0)
      chunk_printf(&trash, "%d\n# %s\n", SRV_STATE_FILE_VERSION, SRV_STATE_FILE_FIELD_NAMES);
    else
      chunk_printf(&trash,
                   "# bkname/svname bkid/svid addr port - purge_delay served used_cur used_max need_est idle_sess unsafe_nb safe_nb idle_lim idle_cur idle_per_thr[%d]\n",
                   global.nbthread);

    if (applet_putchk(appctx, &trash) == -1)
      return 0;

    ctx->state = SHOW_SRV_LIST;

    if (!ctx->px)
      watcher_attach(&ctx->px_watch, main_proxies_first());
  }

  for (; ctx->px; watcher_next(&ctx->px_watch, main_proxies_next(ctx->px))) {
    curproxy = ctx->px;
    /* servers are only in backends */
    if ((curproxy->cap & PR_CAP_BE) && !(curproxy->cap & PR_CAP_INT)) {
      if (!dump_servers_state(appctx))
        return 0;
    }
    /* only the selected proxy is dumped */
    if (ctx->only_pxid) {
      watcher_detach(&ctx->px_watch);
      break;
    }
  }

  return 1;
}

/* release handler for "show servers conn|state" */
static void cli_io_release_show_servers(struct appctx *appctx)
{
  struct show_srv_ctx *ctx = appctx->svcctx;
  watcher_detach(&ctx->px_watch);
  watcher_detach(&ctx->srv_watch);
}

/* Parses backend list and simply report backend names. It keeps the proxy
 * pointer in svcctx since there's nothing else to store there.
 */
static int cli_io_handler_show_backend(struct appctx *appctx)
{
  struct show_be_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));
  struct proxy *curproxy;

  chunk_reset(&trash);

  if (!ctx->px) {
    chunk_printf(&trash, "# name\n");
    if (applet_putchk(appctx, &trash) == -1)
      return 0;

    watcher_init(&ctx->px_watch, &ctx->px, offsetof(struct proxy, watcher_list));
    /* This will automatically update ctx->px pointer. */
    watcher_attach(&ctx->px_watch, main_proxies_first());
  }

  for (; ctx->px; watcher_next(&ctx->px_watch, main_proxies_next(ctx->px))) {
    curproxy = ctx->px;

    /* looking for non-internal backends only */
    if ((curproxy->cap & (PR_CAP_BE|PR_CAP_INT)) != PR_CAP_BE)
      continue;

    chunk_appendf(&trash, "%s\n", curproxy->id);
    if (STRESS_RUN1(applet_putchk_stress(appctx, &trash) == -1,
                    applet_putchk(appctx, &trash) == -1)) {
      return 0;
    }
  }

  return 1;
}

/* release handler for "show backend" */
static void cli_io_release_show_backend(struct appctx *appctx)
{
  struct show_be_ctx *ctx = appctx->svcctx;
  if (ctx->px)
    watcher_detach(&ctx->px_watch);
}

/* Parses the "enable dynamic-cookies backend" directive, it always returns 1.
 *
 * Grabs the proxy lock and each server's lock.
 */
static int cli_parse_enable_dyncookie_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;
  struct server *s;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_backend(appctx, args[3]);
  if (!px)
    return 1;

  if (px->mode != PR_MODE_TCP && px->mode != PR_MODE_HTTP)
    return cli_err(appctx, "Not available.\n");

  /* Note: this lock is to make sure this doesn't change while another
   * thread is in srv_set_dyncookie().
   */
  HA_RWLOCK_WRLOCK(PROXY_LOCK, &px->lock);
  px->ck_opts |= PR_CK_DYNAMIC;
  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &px->lock);

  list_for_each_entry(s, &px->servers, el_px) {
    HA_SPIN_LOCK(SERVER_LOCK, &s->lock);
    srv_set_dyncookie(s);
    HA_SPIN_UNLOCK(SERVER_LOCK, &s->lock);
  }

  return 1;
}

/* Parses the "disable dynamic-cookies backend" directive, it always returns 1.
 *
 * Grabs the proxy lock and each server's lock.
 */
static int cli_parse_disable_dyncookie_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;
  struct server *s;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_backend(appctx, args[3]);
  if (!px)
    return 1;

  if (px->mode != PR_MODE_TCP && px->mode != PR_MODE_HTTP)
    return cli_err(appctx, "Not available.\n");

  /* Note: this lock is to make sure this doesn't change while another
   * thread is in srv_set_dyncookie().
   */
  HA_RWLOCK_WRLOCK(PROXY_LOCK, &px->lock);
  px->ck_opts &= ~PR_CK_DYNAMIC;
  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &px->lock);

  list_for_each_entry(s, &px->servers, el_px) {
    HA_SPIN_LOCK(SERVER_LOCK, &s->lock);
    if (!(s->flags & SRV_F_COOKIESET))
      ha_free(&s->cookie);
    HA_SPIN_UNLOCK(SERVER_LOCK, &s->lock);
  }

  return 1;
}

/* Parses the "set dynamic-cookie-key backend" directive, it always returns 1.
 *
 * Grabs the proxy lock and each server's lock.
 */
static int cli_parse_set_dyncookie_key_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;
  struct server *s;
  char *newkey;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_backend(appctx, args[3]);
  if (!px)
    return 1;

  if (px->mode != PR_MODE_TCP && px->mode != PR_MODE_HTTP)
    return cli_err(appctx, "Not available.\n");

  if (!*args[4])
    return cli_err(appctx, "String value expected.\n");

  newkey = strdup(args[4]);
  if (!newkey)
    return cli_err(appctx, "Failed to allocate memory.\n");

  /* Note: this lock is to make sure this doesn't change while another
   * thread is in srv_set_dyncookie().
   */
  HA_RWLOCK_WRLOCK(PROXY_LOCK, &px->lock);
  free(px->dyncookie_key);
  px->dyncookie_key = newkey;
  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &px->lock);

  list_for_each_entry(s, &px->servers, el_px) {
    HA_SPIN_LOCK(SERVER_LOCK, &s->lock);
    srv_set_dyncookie(s);
    HA_SPIN_UNLOCK(SERVER_LOCK, &s->lock);
  }

  return 1;
}

/* Parses the "set maxconn frontend" directive, it always returns 1.
 *
 * Grabs the proxy lock.
 */
static int cli_parse_set_maxconn_frontend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;
  struct listener *l;
  int v;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_frontend(appctx, args[3]);
  if (!px)
    return 1;

  if (!*args[4])
    return cli_err(appctx, "Integer value expected.\n");

  v = atoi(args[4]);
  if (v < 0)
    return cli_err(appctx, "Value out of range.\n");

  /* OK, the value is fine, so we assign it to the proxy and to all of
   * its listeners. The blocked ones will be dequeued.
   */
  HA_RWLOCK_WRLOCK(PROXY_LOCK, &px->lock);

  px->maxconn = v;
  list_for_each_entry(l, &px->conf.listeners, by_fe) {
    if (l->state == LI_FULL)
      relax_listener(l, 1, 0);
  }

  if (px->maxconn > px->feconn)
    dequeue_proxy_listeners(px, 1);

  HA_RWLOCK_WRUNLOCK(PROXY_LOCK, &px->lock);

  return 1;
}

/* Parses the "shutdown frontend" directive, it always returns 1.
 *
 * Grabs the proxy lock.
 */
static int cli_parse_shutdown_frontend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_frontend(appctx, args[2]);
  if (!px)
    return 1;

  if (px->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
    return cli_msg(appctx, LOG_NOTICE, "Frontend was already shut down.\n");

  stop_proxy(px);
  return 1;
}

/* Parses a "add backend" CLI command to allocate a new backend instance,
 * derived from a default proxy instance. This operation is performed under
 * thread isolation.
 *
 * Always returns 1.
 */
static int cli_parse_add_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px, *defpx;
  struct post_proxy_check_fct *ppcf;
  const char *be_name, *def_name, *guid = NULL, *err;
  char *msg = NULL;
  enum pr_mode mode = 0;
  int err_code = ERR_NONE;

  usermsgs_clr("CLI");

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  ++args;
  be_name = args[1];
  if (!*be_name) {
    cli_err(appctx, "Require backend name.\n");
    return 1;
  }
  if ((err = invalid_char(be_name))) {
    cli_dynerr(appctx, memprintf(&msg, "Invalid character '%c' in backend name.\n", *err));
    return 1;
  }

  ++args;
  def_name = args[2];
  if (!*args[1] || !*def_name || strcmp(args[1], "from") != 0) {
    cli_err(appctx, "Usage: add backend <name> from <defproxy>.\n");
    return 1;
  }

  /* Parse optional arguments */
  args += 2;
  while (*args[1]) {
    /* "mode" */
    if (*args[2] && !mode && strcmp(args[1], "mode") == 0) {
      mode = str_to_proxy_mode(args[2]);
      if (mode == PR_MODES) {
        cli_err(appctx, "Unknown proxy mode.\n");
        return 1;
      }
      if (mode != PR_MODE_TCP && mode != PR_MODE_HTTP) {
        cli_err(appctx, "Dynamic backends are compatible with only TCP or HTTP mode.\n");
        return 1;
      }
    }
    /* guid */
    else if (*args[2] && !guid && strcmp(args[1], "guid") == 0) {
      guid = args[2];
    }
    /* unknown, malformed or duplicate argument */
    else {
      cli_err(appctx, "Usage: add backend <name> from <defproxy> [mode <px_mode>] [guid <val>].\n");
      return 1;
    }

    args += 2;
  }

  defpx = proxy_find_by_name(def_name, PR_CAP_DEF, 0);
  if (!defpx) {
    cli_dynerr(appctx, memprintf(&msg, "Cannot find default proxy '%s'.\n", def_name));
    return 1;
  }
  if (!(defpx->flags & PR_FL_DEF_EXPLICIT_MODE) && !mode) {
    cli_dynerr(appctx, memprintf(&msg, "Mode is required as '%s' default proxy does not explicitly defines it.\n", def_name));
    return 1;
  }
  if (defpx->mode != PR_MODE_TCP && defpx->mode != PR_MODE_HTTP) {
    cli_dynerr(appctx, memprintf(&msg, "Dynamic backends only support TCP or HTTP mode, whereas default proxy '%s' uses 'mode %s'.\n",
               def_name, proxy_mode_str(defpx->mode)));
    return 1;
  }

  thread_isolate();

  if ((px = proxy_find_by_name(be_name, PR_CAP_NONE, 0)) ||
      (px = proxy_find_by_name(be_name, PR_CAP_DEF, 0))) {
    memprintf(&msg,
      "name is already used by other proxy '%s %s'",
      proxy_cap_str(px->cap), be_name);
    px = NULL;
    goto err;
  }

  px = alloc_new_proxy(be_name, PR_CAP_BE, &msg);
  if (!px)
    goto err;

  if (guid && guid_insert(&px->obj_type, guid, &msg)) {
    memprintf(&msg, "GUID insertion : %s", msg);
    goto err;
  }

  if (proxy_defproxy_cpy(px, defpx, &msg))
    goto err;

  /* Override default-proxy mode if defined. */
  if (mode)
    px->mode = mode;

  if (proxy_ref_defaults(px, defpx, &msg))
    goto err;

  proxy_init_per_thr(px);

  if (proxy_finalize(px, &err_code))
    goto err;

  list_for_each_entry(ppcf, &post_proxy_check_list, list) {
    err_code |= ppcf->fct(px);
    if (err_code & (ERR_ABORT|ERR_FATAL))
      goto err;
  }

  px->flags |= PR_FL_BE_UNPUBLISHED;

  if (!stats_allocate_proxy_counters_internal(&px->extra_counters_be,
                                              COUNTERS_BE,
                                              STATS_PX_CAP_BE,
                                              &px->per_tgrp->extra_counters_be_storage,
                                              &px->per_tgrp[1].extra_counters_be_storage -
                                              &px->per_tgrp[0].extra_counters_be_storage)) {
    memprintf(&msg, "failed to allocate extra counters");
    goto err;
  }

  /* Assign automatically proxy ID. */
  px->uuid = proxy_get_next_id(dynpx_next_id);
  if (!px->uuid) {
    memprintf(&msg, "no spare proxy ID available");
    goto err;
  }
  proxy_index_id(px);
  dynpx_next_id = px->uuid;

  /* Insert <px> into <main_proxies> list of visible proxies. Note that
   * insertion in <all_proxies> has already been performed in
   * setup_new_proxy() via alloc_new_proxy().
   */
  main_proxies_register(px);
  thread_release();

  if (unlikely(!be_supports_dynamic_srv(px, &msg)))
    memprintf(&msg, "New backend registered (no support for dynamic servers: %s)", msg);
  else
    memprintf(&msg, "New backend registered");
  ha_notice("%s.\n", msg);
  ha_free(&msg);
  cli_umsg(appctx, LOG_INFO);

  return 1;

 err:
  /* This ensures any potential refcounting on defpx is decremented. */
  proxy_drop(px);
  thread_release();

  if (msg) {
    memprintf(&msg, "Error during backend creation : %s.\n", msg);
    cli_dynerr(appctx, msg);
  }
  else {
    ha_alert("Error during backend creation.\n");
    cli_umsgerr(appctx);
  }

  return 1;
}

/* Test if the backend instance named <bename> can be deleted.
 *
 * Returns a positive integer if backend can be deleted. Else, 0 is returned if
 * backend should be deletable after some delay. A negative value indicates
 * that backend cannot be deleted without any external action.
 *
 * If <pb> is not NULL, it will be set to point to the backend instance if name
 * is found. If <pm> is not NULL, it will be used on error to point to the
 * description failure.
 */
int be_check_for_deletion(const char *bename, struct proxy **pb, const char **pm)
{
  struct proxy *be = NULL;
  const char *msg = NULL;
  int ret;

  /* First, unrecoverable errors */
  ret = -1;

  if (!(be = proxy_be_by_name(bename))) {
    msg = "No such backend.";
    goto out;
  }

  if (be->cap & PR_CAP_FE) {
    msg = "Cannot delete a listen section.";
    goto out;
  }

  if (be->table) {
    msg = "Cannot remove a backend with stick-table.";
    goto out;
  }

  if (be->flags & PR_FL_NON_PURGEABLE) {
    msg = "This proxy cannot be removed at runtime due to other configuration elements pointing to it.";
    goto out;
  }

  if (be->mode != PR_MODE_TCP && be->mode != PR_MODE_HTTP) {
    msg = "Only TCP or HTTP proxies can be removed at runtime.";
    goto out;
  }

  if (!(be->flags & PR_FL_BE_UNPUBLISHED)) {
    msg = "Backend must be unpublished prior to its deletion.";
    goto out;
  }

  if (!LIST_ISEMPTY(&be->servers)) {
    msg = "Only a backend without server can be deleted.";
    goto out;
  }

  /* Second, conditions that may change over time */
  ret = 0;

  if (be->beconn) {
    msg = "Backend still has attached streams on it.";
    goto out;
  }

  ret = 1;

 out:
  if (pb)
    *pb = be;
  if (pm)
    *pm = msg;
  return ret;
}

/* Handler for "delete backend". Runs under thread isolation. Always returns 1. */
static int cli_parse_delete_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct watcher *px_watch;
  struct proxy *px;
  const char *msg;
  char *be_name;
  int ret;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  if (*args[3]) {
    cli_err(appctx, "Usage: del backend <name>.\n");
    return 1;
  }

  thread_isolate_full();

  be_name = args[2];
  ret = be_check_for_deletion(be_name, &px, &msg);
  if (ret <= 0) {
    cli_err(appctx, msg);
    goto out;
  }

  while (!MT_LIST_ISEMPTY(&px->watcher_list)) {
    px_watch = MT_LIST_NEXT(&px->watcher_list, struct watcher *, el);
    watcher_next(px_watch, main_proxies_next(px));
  }

  ceb32_item_delete(&used_proxy_id, conf.uuid_node, uuid, px);
  cebis_item_delete(&proxy_by_name, conf.name_node, id, px);

  /* Detach backend from global main_proxies. */
  LIST_DELETE(&px->el);

  px->flags |= PR_FL_DELETED;

  thread_release();

  ha_notice("Backend deleted.\n");
  proxy_drop(px);

  cli_umsg(appctx, LOG_INFO);
  return 1;

 out:
  thread_release();
  return 1;
}

/* Parses the "disable frontend" directive, it always returns 1.
 *
 * Grabs the proxy lock.
 */
static int cli_parse_disable_frontend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;
  int ret;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_frontend(appctx, args[2]);
  if (!px)
    return 1;

  if (px->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
    return cli_msg(appctx, LOG_NOTICE, "Frontend was previously shut down, cannot disable.\n");

  if (!px->li_ready)
    return cli_msg(appctx, LOG_NOTICE, "All sockets are already disabled.\n");

  /* pause_proxy will take PROXY_LOCK */
  ret = pause_proxy(px);

  if (!ret)
    return cli_err(appctx, "Failed to pause frontend, check logs for precise cause.\n");

  return 1;
}

/* Parses the "enable frontend" directive, it always returns 1.
 *
 * Grabs the proxy lock.
 */
static int cli_parse_enable_frontend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;
  int ret;

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_frontend(appctx, args[2]);
  if (!px)
    return 1;

  if (px->flags & (PR_FL_DISABLED|PR_FL_STOPPED))
    return cli_err(appctx, "Frontend was previously shut down, cannot enable.\n");

  if (px->li_ready == px->li_all)
    return cli_msg(appctx, LOG_NOTICE, "All sockets are already enabled.\n");

  /* resume_proxy will take PROXY_LOCK */
  ret = resume_proxy(px);

  if (!ret)
    return cli_err(appctx, "Failed to resume frontend, check logs for precise cause (port conflict?).\n");
  return 1;
}

static int cli_parse_publish_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;

  usermsgs_clr("CLI");

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_backend(appctx, args[2]);
  if (!px)
    return cli_err(appctx, "No such backend.\n");

  if (px->flags & PR_FL_DISABLED)
    return cli_err(appctx, "No effect on a disabled backend.\n");

  thread_isolate();
  px->flags &= ~PR_FL_BE_UNPUBLISHED;
  thread_release();

  ha_notice("Backend published.\n");
  return cli_umsg(appctx, LOG_INFO);
}

static int cli_parse_unpublish_backend(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct proxy *px;

  usermsgs_clr("CLI");

  if (!cli_has_level(appctx, ACCESS_LVL_ADMIN))
    return 1;

  px = cli_find_backend(appctx, args[2]);
  if (!px)
    return cli_err(appctx, "No such backend.\n");

  if (px->flags & PR_FL_DISABLED)
    return cli_err(appctx, "No effect on a disabled backend.\n");

  thread_isolate();
  px->flags |= PR_FL_BE_UNPUBLISHED;
  thread_release();

  ha_notice("Backend unpublished.\n");
  return cli_umsg(appctx, LOG_INFO);
}

/* appctx context used during "show errors" */
struct show_errors_ctx {
  struct proxy *px; /* current proxy being dumped, NULL = not started yet. */
  unsigned int flag;  /* bit0: buffer being dumped, 0 = req, 1 = resp ; bit1=skip req ; bit2=skip resp. */
  unsigned int ev_id; /* event ID of error being dumped */
  int iid;    /* if >= 0, ID of the proxy to filter on */
  int ptr;    /* <0: headers, >=0 : text pointer to restart from */
  int bol;    /* pointer to beginning of current line */

  struct watcher px_watch; /* watcher to automatically update px pointer on backend deletion */
};

/* "show errors" handler for the CLI. Returns 0 if wants to continue, 1 to stop
 * now.
 */
static int cli_parse_show_errors(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct show_errors_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));

  if (!cli_has_level(appctx, ACCESS_LVL_OPER))
    return 1;

  if (*args[2]) {
    struct proxy *px;

    px = proxy_find_by_name(args[2], 0, 0);
    if (px)
      ctx->iid = px->uuid;
    else
      ctx->iid = atoi(args[2]);

    if (!ctx->iid)
      return cli_err(appctx, "No such proxy.\n");
  }
  else
    ctx->iid  = -1; // dump all proxies

  ctx->flag = 0;
  if (strcmp(args[3], "request") == 0)
    ctx->flag |= 4; // ignore response
  else if (strcmp(args[3], "response") == 0)
    ctx->flag |= 2; // ignore request

  ctx->px = NULL;
  watcher_init(&ctx->px_watch, &ctx->px, offsetof(struct proxy, watcher_list));

  return 0;
}

/* This function dumps all captured errors onto the stream connector's
 * read buffer. It returns 0 if the output buffer is full and it needs
 * to be called again, otherwise non-zero.
 */
static int cli_io_handler_show_errors(struct appctx *appctx)
{
  struct show_errors_ctx *ctx = appctx->svcctx;
  extern const char *monthname[12];

  chunk_reset(&trash);

  if (!ctx->px) {
    /* the function had not been called yet, let's prepare the
     * buffer for a response.
     */
    struct tm tm;

    get_localtime(date.tv_sec, &tm);
    chunk_appendf(&trash, "Total events captured on [%02d/%s/%04d:%02d:%02d:%02d.%03d] : %u\n",
           tm.tm_mday, monthname[tm.tm_mon], tm.tm_year+1900,
           tm.tm_hour, tm.tm_min, tm.tm_sec, (int)(date.tv_usec/1000),
           error_snapshot_id);

    if (applet_putchk(appctx, &trash) == -1)
      goto cant_send;

    watcher_attach(&ctx->px_watch, main_proxies_first());
    ctx->bol = 0;
    ctx->ptr = -1;
  }

  /* we have two inner loops here, one for the proxy, the other one for
   * the buffer.
   */
  while (ctx->px) {
    struct error_snapshot *es;

    HA_RWLOCK_RDLOCK(PROXY_LOCK, &ctx->px->lock);

    if ((ctx->flag & 1) == 0) {
      es = ctx->px->invalid_req;
      if (ctx->flag & 2) // skip req
        goto next;
    }
    else {
      es = ctx->px->invalid_rep;
      if (ctx->flag & 4) // skip resp
        goto next;
    }

    if (!es)
      goto next;

    if (ctx->iid >= 0 &&
        ctx->px->uuid != ctx->iid &&
        (!es->oe || es->oe->uuid != ctx->iid))
      goto next;

    if (ctx->ptr < 0) {
      /* just print headers now */

      char pn[INET6_ADDRSTRLEN];
      struct tm tm;
      int port;

      get_localtime(es->when.tv_sec, &tm);
      chunk_appendf(&trash, " \n[%02d/%s/%04d:%02d:%02d:%02d.%03d]",
             tm.tm_mday, monthname[tm.tm_mon], tm.tm_year+1900,
             tm.tm_hour, tm.tm_min, tm.tm_sec, (int)(es->when.tv_usec/1000));

      switch (addr_to_str(&es->src, pn, sizeof(pn))) {
      case AF_INET:
      case AF_INET6:
        port = get_host_port(&es->src);
        break;
      default:
        port = 0;
      }

      switch (ctx->flag & 1) {
      case 0:
        chunk_appendf(&trash,
               " frontend %s (#%d): invalid request\n"
               "  backend %s (#%d)",
               ctx->px->id, ctx->px->uuid,
               (es->oe && es->oe->cap & PR_CAP_BE) ? es->oe->id : "<NONE>",
               (es->oe && es->oe->cap & PR_CAP_BE) ? es->oe->uuid : -1);
        break;
      case 1:
        chunk_appendf(&trash,
               " backend %s (#%d): invalid response\n"
               "  frontend %s (#%d)",
               ctx->px->id, ctx->px->uuid,
               es->oe ? es->oe->id : "<NONE>" , es->oe ? es->oe->uuid : -1);
        break;
      }

      chunk_appendf(&trash,
                    ", server %s (#%d), event #%u, src %s:%d\n"
                    "  buffer starts at %llu (including %u out), %u free,\n"
                    "  len %u, wraps at %u, error at position %u\n",
                    es->srv ? es->srv->id : "<NONE>",
                    es->srv ? es->srv->puid : -1,
                    es->ev_id, pn, port,
                    es->buf_ofs, es->buf_out,
                    es->buf_size - es->buf_out - es->buf_len,
                    es->buf_len, es->buf_wrap, es->buf_err);

      if (es->show)
        es->show(&trash, es);

      chunk_appendf(&trash, "  \n");

      if (STRESS_RUN1(applet_putchk_stress(appctx, &trash) == -1,
                      applet_putchk(appctx, &trash) == -1)) {
        goto cant_send_unlock;
      }

      ctx->ptr = 0;
      ctx->ev_id = es->ev_id;
    }

    if (ctx->ev_id != es->ev_id) {
      /* the snapshot changed while we were dumping it */
      chunk_appendf(&trash,
             "  WARNING! update detected on this snapshot, dump interrupted. Please re-check!\n");
      if (applet_putchk(appctx, &trash) == -1)
        goto cant_send_unlock;

      goto next;
    }

    /* OK, ptr >= 0, so we have to dump the current line */
    while (ctx->ptr < es->buf_len && ctx->ptr < es->buf_size) {
      int newptr;
      int newline;

      newline = ctx->bol;
      newptr = dump_text_line(&trash, es->buf, es->buf_size, es->buf_len, &newline, ctx->ptr);
      if (newptr == ctx->ptr) {
        applet_fl_set(appctx, APPCTX_FL_OUTBLK_FULL);
        goto cant_send_unlock;
      }

      if (STRESS_RUN1(applet_putchk_stress(appctx, &trash) == -1,
                      applet_putchk(appctx, &trash) == -1)) {
        goto cant_send_unlock;
      }

      ctx->ptr = newptr;
      ctx->bol = newline;
    };
  next:
    HA_RWLOCK_RDUNLOCK(PROXY_LOCK, &ctx->px->lock);
    ctx->bol = 0;
    ctx->ptr = -1;
    ctx->flag ^= 1;
    if (!(ctx->flag & 1))
      watcher_next(&ctx->px_watch, main_proxies_next(ctx->px));
  }

  /* dump complete */
  return 1;

 cant_send_unlock:
  HA_RWLOCK_RDUNLOCK(PROXY_LOCK, &ctx->px->lock);
 cant_send:
  return 0;
}

/* release handler for "show errors" */
static void cli_io_release_show_errors(struct appctx *appctx)
{
  struct show_errors_ctx *ctx = appctx->svcctx;
  watcher_detach(&ctx->px_watch);
}

/* register cli keywords */
static struct cli_kw_list cli_kws = {{ },{
  { { "add", "backend", NULL },                       "add backend <backend>                   : add a new backend",                                              cli_parse_add_backend, NULL, NULL, NULL, 0 },
  { { "del", "backend", NULL },                       "del backend <backend>                   : delete a backend",                                               cli_parse_delete_backend, NULL, NULL, NULL, 0 },
  { { "disable", "frontend",  NULL },                 "disable frontend <frontend>             : temporarily disable specific frontend",                          cli_parse_disable_frontend, NULL, NULL },
  { { "enable", "frontend",  NULL },                  "enable frontend <frontend>              : re-enable specific frontend",                                    cli_parse_enable_frontend, NULL, NULL },
  { { "publish", "backend",  NULL },                  "publish backend <backend>               : mark backend as ready for traffic",                              cli_parse_publish_backend, NULL, NULL },
  { { "set", "maxconn", "frontend",  NULL },          "set maxconn frontend <frontend> <value> : change a frontend's maxconn setting",                            cli_parse_set_maxconn_frontend, NULL },
  { { "show", "default-server", NULL },               "show default-server [<backend>]         : list default-server instances in all or a single backend",       cli_parse_show_default_server, cli_io_handler_show_default_server, cli_io_release_show_default_server, },
  { { "show", "defaults", NULL },                     "show defaults                           : list all proxies defaults sections",                             NULL, cli_io_handler_show_defaults },
  { { "show","servers", "conn",  NULL },              "show servers conn [<backend>]           : dump server connections status (all or for a single backend)",   cli_parse_show_servers, cli_io_handler_servers_state, cli_io_release_show_servers, },
  { { "show","servers", "state",  NULL },             "show servers state [<backend>]          : dump volatile server information (all or for a single backend)", cli_parse_show_servers, cli_io_handler_servers_state, cli_io_release_show_servers, },
  { { "show", "backend", NULL },                      "show backend                            : list backends in the current running config",                    NULL, cli_io_handler_show_backend, cli_io_release_show_backend, },
  { { "shutdown", "frontend",  NULL },                "shutdown frontend <frontend>            : stop a specific frontend",                                       cli_parse_shutdown_frontend, NULL, NULL },
  { { "set", "dynamic-cookie-key", "backend", NULL }, "set dynamic-cookie-key backend <bk> <k> : change a backend secret key for dynamic cookies",                cli_parse_set_dyncookie_key_backend, NULL },
  { { "unpublish", "backend",  NULL },                "unpublish backend <backend>             : remove backend for traffic processing",                          cli_parse_unpublish_backend, NULL, NULL },
  { { "enable", "dynamic-cookie", "backend", NULL },  "enable dynamic-cookie backend <bk>      : enable dynamic cookies on a specific backend",                   cli_parse_enable_dyncookie_backend, NULL },
  { { "disable", "dynamic-cookie", "backend", NULL }, "disable dynamic-cookie backend <bk>     : disable dynamic cookies on a specific backend",                  cli_parse_disable_dyncookie_backend, NULL },
  { { "show", "errors", NULL },                       "show errors [<px>] [request|response]   : report last request and/or response errors for each proxy",      cli_parse_show_errors, cli_io_handler_show_errors, cli_io_release_show_errors, },
  {{},}
}};

INITCALL1(STG_REGISTER, cli_register_kw, &cli_kws);

/*
 * Local variables:
 *  c-indent-level: 8
 *  c-basic-offset: 8
 * End:
 */

Coverage Report

Created: 2026-08-13 07:18