/src/haproxy/src/stream.c

Source (jump to first uncovered line)
/*
 * Stream management functions.
 *
 * Copyright 2000-2012 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 <stdlib.h>
#include <unistd.h>

#include <import/ebistree.h>

#include <haproxy/acl.h>
#include <haproxy/action.h>
#include <haproxy/activity.h>
#include <haproxy/api.h>
#include <haproxy/applet.h>
#include <haproxy/arg.h>
#include <haproxy/backend.h>
#include <haproxy/capture.h>
#include <haproxy/cfgparse.h>
#include <haproxy/channel.h>
#include <haproxy/check.h>
#include <haproxy/cli.h>
#include <haproxy/connection.h>
#include <haproxy/dict.h>
#include <haproxy/dynbuf.h>
#include <haproxy/fd.h>
#include <haproxy/filters.h>
#include <haproxy/freq_ctr.h>
#include <haproxy/frontend.h>
#include <haproxy/global.h>
#include <haproxy/hlua.h>
#include <haproxy/http_ana.h>
#include <haproxy/http_rules.h>
#include <haproxy/htx.h>
#include <haproxy/istbuf.h>
#include <haproxy/log.h>
#include <haproxy/pipe.h>
#include <haproxy/pool.h>
#include <haproxy/proxy.h>
#include <haproxy/queue.h>
#include <haproxy/sc_strm.h>
#include <haproxy/server.h>
#include <haproxy/resolvers.h>
#include <haproxy/sample.h>
#include <haproxy/session.h>
#include <haproxy/stats-t.h>
#include <haproxy/stconn.h>
#include <haproxy/stick_table.h>
#include <haproxy/stream.h>
#include <haproxy/task.h>
#include <haproxy/tcp_rules.h>
#include <haproxy/thread.h>
#include <haproxy/tools.h>
#include <haproxy/trace.h>
#include <haproxy/vars.h>


DECLARE_POOL(pool_head_stream, "stream", sizeof(struct stream));
DECLARE_POOL(pool_head_uniqueid, "uniqueid", UNIQUEID_LEN);

/* incremented by each "show sess" to fix a delimiter between streams */
unsigned stream_epoch = 0;

/* List of all use-service keywords. */
static struct list service_keywords = LIST_HEAD_INIT(service_keywords);


/* trace source and events */
static void strm_trace(enum trace_level level, uint64_t mask,
           const struct trace_source *src,
           const struct ist where, const struct ist func,
           const void *a1, const void *a2, const void *a3, const void *a4);

/* The event representation is split like this :
 *   strm  - stream
 *   sc    - stream connector
 *   http  - http analyzis
 *   tcp   - tcp analyzis
 *
 * STRM_EV_* macros are defined in <proto/stream.h>
 */
static const struct trace_event strm_trace_events[] = {
  { .mask = STRM_EV_STRM_NEW,     .name = "strm_new",     .desc = "new stream" },
  { .mask = STRM_EV_STRM_FREE,    .name = "strm_free",    .desc = "release stream" },
  { .mask = STRM_EV_STRM_ERR,     .name = "strm_err",     .desc = "error during stream processing" },
  { .mask = STRM_EV_STRM_ANA,     .name = "strm_ana",     .desc = "stream analyzers" },
  { .mask = STRM_EV_STRM_PROC,    .name = "strm_proc",    .desc = "stream processing" },

  { .mask = STRM_EV_CS_ST,        .name = "sc_state",     .desc = "processing connector states" },

  { .mask = STRM_EV_HTTP_ANA,     .name = "http_ana",     .desc = "HTTP analyzers" },
  { .mask = STRM_EV_HTTP_ERR,     .name = "http_err",     .desc = "error during HTTP analyzis" },

  { .mask = STRM_EV_TCP_ANA,      .name = "tcp_ana",      .desc = "TCP analyzers" },
  { .mask = STRM_EV_TCP_ERR,      .name = "tcp_err",      .desc = "error during TCP analyzis" },

  { .mask = STRM_EV_FLT_ANA,      .name = "flt_ana",      .desc = "Filter analyzers" },
  { .mask = STRM_EV_FLT_ERR,      .name = "flt_err",      .desc = "error during filter analyzis" },
  {}
};

static const struct name_desc strm_trace_lockon_args[4] = {
  /* arg1 */ { /* already used by the stream */ },
  /* arg2 */ { },
  /* arg3 */ { },
  /* arg4 */ { }
};

static const struct name_desc strm_trace_decoding[] = {
#define STRM_VERB_CLEAN    1
  { .name="clean",    .desc="only user-friendly stuff, generally suitable for level \"user\"" },
#define STRM_VERB_MINIMAL  2
  { .name="minimal",  .desc="report info on streams and connectors" },
#define STRM_VERB_SIMPLE   3
  { .name="simple",   .desc="add info on request and response channels" },
#define STRM_VERB_ADVANCED 4
  { .name="advanced", .desc="add info on channel's buffer for data and developer levels only" },
#define STRM_VERB_COMPLETE 5
  { .name="complete", .desc="add info on channel's buffer" },
  { /* end */ }
};

struct trace_source trace_strm = {
  .name = IST("stream"),
  .desc = "Applicative stream",
  .arg_def = TRC_ARG1_STRM,  // TRACE()'s first argument is always a stream
  .default_cb = strm_trace,
  .known_events = strm_trace_events,
  .lockon_args = strm_trace_lockon_args,
  .decoding = strm_trace_decoding,
  .report_events = ~0,  // report everything by default
};

#define TRACE_SOURCE &trace_strm
INITCALL1(STG_REGISTER, trace_register_source, TRACE_SOURCE);

/* the stream traces always expect that arg1, if non-null, is of a stream (from
 * which we can derive everything), that arg2, if non-null, is an http
 * transaction, that arg3, if non-null, is an http message.
 */
static void strm_trace(enum trace_level level, uint64_t mask, const struct trace_source *src,
           const struct ist where, const struct ist func,
           const void *a1, const void *a2, const void *a3, const void *a4)
{
  const struct stream *s = a1;
  const struct http_txn *txn = a2;
  const struct http_msg *msg = a3;
  struct task *task;
  const struct channel *req, *res;
  struct htx *htx;

  if (!s || src->verbosity < STRM_VERB_CLEAN)
    return;

  task = s->task;
  req  = &s->req;
  res  = &s->res;
  htx  = (msg ? htxbuf(&msg->chn->buf) : NULL);

  /* General info about the stream (htx/tcp, id...) */
  chunk_appendf(&trace_buf, " : [%u,%s]",
          s->uniq_id, ((s->flags & SF_HTX) ? "HTX" : "TCP"));
  if (isttest(s->unique_id)) {
    chunk_appendf(&trace_buf, " id=");
    b_putist(&trace_buf, s->unique_id);
  }

  /* Front and back stream connector state */
  chunk_appendf(&trace_buf, " SC=(%s,%s)",
          sc_state_str(s->scf->state), sc_state_str(s->scb->state));

  /* If txn is defined, HTTP req/rep states */
  if (txn)
    chunk_appendf(&trace_buf, " HTTP=(%s,%s)",
            h1_msg_state_str(txn->req.msg_state), h1_msg_state_str(txn->rsp.msg_state));
  if (msg)
    chunk_appendf(&trace_buf, " %s", ((msg->chn->flags & CF_ISRESP) ? "RESPONSE" : "REQUEST"));

  if (src->verbosity == STRM_VERB_CLEAN)
    return;

  /* If msg defined, display status-line if possible (verbosity > MINIMAL) */
  if (src->verbosity > STRM_VERB_MINIMAL && htx && htx_nbblks(htx)) {
    const struct htx_blk *blk = __htx_get_head_blk(htx);
    const struct htx_sl  *sl  = htx_get_blk_ptr(htx, blk);
    enum htx_blk_type    type = htx_get_blk_type(blk);

    if (type == HTX_BLK_REQ_SL || type == HTX_BLK_RES_SL)
      chunk_appendf(&trace_buf, " - \"%.*s %.*s %.*s\"",
              HTX_SL_P1_LEN(sl), HTX_SL_P1_PTR(sl),
              HTX_SL_P2_LEN(sl), HTX_SL_P2_PTR(sl),
              HTX_SL_P3_LEN(sl), HTX_SL_P3_PTR(sl));
  }

    chunk_appendf(&trace_buf, " - t=%p t.exp=%d s=(%p,0x%08x,0x%x)",
            task, tick_isset(task->expire) ? TICKS_TO_MS(task->expire - now_ms) : TICK_ETERNITY, s, s->flags, s->conn_err_type);

  /* If txn defined info about HTTP msgs, otherwise info about SI. */
  if (txn) {
    chunk_appendf(&trace_buf, " txn.flags=0x%08x, http.flags=(0x%08x,0x%08x) status=%d",
            txn->flags, txn->req.flags, txn->rsp.flags, txn->status);
  }
  else {
    chunk_appendf(&trace_buf, " scf=(%p,%d,0x%08x,0x%x) scb=(%p,%d,0x%08x,0x%x) scf.exp(r,w)=(%d,%d) scb.exp(r,w)=(%d,%d) retries=%d",
            s->scf, s->scf->state, s->scf->flags, s->scf->sedesc->flags,
            s->scb, s->scb->state, s->scb->flags, s->scb->sedesc->flags,
            tick_isset(sc_ep_rcv_ex(s->scf)) ? TICKS_TO_MS(sc_ep_rcv_ex(s->scf) - now_ms) : TICK_ETERNITY,
            tick_isset(sc_ep_snd_ex(s->scf)) ? TICKS_TO_MS(sc_ep_snd_ex(s->scf) - now_ms) : TICK_ETERNITY,
            tick_isset(sc_ep_rcv_ex(s->scb)) ? TICKS_TO_MS(sc_ep_rcv_ex(s->scb) - now_ms) : TICK_ETERNITY,
            tick_isset(sc_ep_snd_ex(s->scb)) ? TICKS_TO_MS(sc_ep_snd_ex(s->scb) - now_ms) : TICK_ETERNITY,
            s->conn_retries);
  }

  if (src->verbosity == STRM_VERB_MINIMAL)
    return;


  /* If txn defined, don't display all channel info */
  if (src->verbosity == STRM_VERB_SIMPLE || txn) {
    chunk_appendf(&trace_buf, " req=(%p .fl=0x%08x .exp=%d)",
            req, req->flags, tick_isset(req->analyse_exp) ? TICKS_TO_MS(req->analyse_exp - now_ms) : TICK_ETERNITY);
    chunk_appendf(&trace_buf, " res=(%p .fl=0x%08x .exp=%d)",
            res, res->flags, tick_isset(res->analyse_exp) ? TICKS_TO_MS(res->analyse_exp - now_ms) : TICK_ETERNITY);
  }
  else {
    chunk_appendf(&trace_buf, " req=(%p .fl=0x%08x .ana=0x%08x .exp=%u .o=%lu .tot=%llu .to_fwd=%u)",
            req, req->flags, req->analysers, req->analyse_exp,
            (long)req->output, req->total, req->to_forward);
    chunk_appendf(&trace_buf, " res=(%p .fl=0x%08x .ana=0x%08x .exp=%u .o=%lu .tot=%llu .to_fwd=%u)",
            res, res->flags, res->analysers, res->analyse_exp,
            (long)res->output, res->total, res->to_forward);
  }

  if (src->verbosity == STRM_VERB_SIMPLE ||
      (src->verbosity == STRM_VERB_ADVANCED && src->level < TRACE_LEVEL_DATA))
    return;

  /* channels' buffer info */
  if (s->flags & SF_HTX) {
    struct htx *rqhtx = htxbuf(&req->buf);
    struct htx *rphtx = htxbuf(&res->buf);

    chunk_appendf(&trace_buf, " htx=(%u/%u#%u, %u/%u#%u)",
            rqhtx->data, rqhtx->size, htx_nbblks(rqhtx),
            rphtx->data, rphtx->size, htx_nbblks(rphtx));
  }
  else {
    chunk_appendf(&trace_buf, " buf=(%u@%p+%u/%u, %u@%p+%u/%u)",
            (unsigned int)b_data(&req->buf), b_orig(&req->buf),
            (unsigned int)b_head_ofs(&req->buf), (unsigned int)b_size(&req->buf),
            (unsigned int)b_data(&res->buf), b_orig(&res->buf),
            (unsigned int)b_head_ofs(&res->buf), (unsigned int)b_size(&res->buf));
  }

  /* If msg defined, display htx info if defined (level > USER) */
  if (src->level > TRACE_LEVEL_USER && htx && htx_nbblks(htx)) {
    int full = 0;

    /* Full htx info (level > STATE && verbosity > SIMPLE) */
    if (src->level > TRACE_LEVEL_STATE) {
      if (src->verbosity == STRM_VERB_COMPLETE)
        full = 1;
    }

    chunk_memcat(&trace_buf, "\n\t", 2);
    htx_dump(&trace_buf, htx, full);
  }
}

/* Upgrade an existing stream for stream connector <sc>. Return < 0 on error. This
 * is only valid right after a TCP to H1 upgrade. The stream should be
 * "reativated" by removing SF_IGNORE flag. And the right mode must be set.  On
 * success, <input> buffer is transferred to the stream and thus points to
 * BUF_NULL. On error, it is unchanged and it is the caller responsibility to
 * release it (this never happens for now).
 */
int stream_upgrade_from_sc(struct stconn *sc, struct buffer *input)
{
  struct stream *s = __sc_strm(sc);
  const struct mux_ops *mux = sc_mux_ops(sc);

  if (mux) {
    if (mux->flags & MX_FL_HTX)
      s->flags |= SF_HTX;
  }

  if (!b_is_null(input)) {
    /* Xfer the input buffer to the request channel. <input> will
     * than point to BUF_NULL. From this point, it is the stream
     * responsibility to release it.
     */
    s->req.buf = *input;
    *input = BUF_NULL;
    s->req.total = (IS_HTX_STRM(s) ? htxbuf(&s->req.buf)->data : b_data(&s->req.buf));
    sc_ep_report_read_activity(s->scf);
  }

  s->req.flags |= CF_READ_EVENT; /* Always report a read event */
  s->flags &= ~SF_IGNORE;

  task_wakeup(s->task, TASK_WOKEN_INIT);
  return 0;
}

/* Callback used to wake up a stream when an input buffer is available. The
 * stream <s>'s stream connectors are checked for a failed buffer allocation
 * as indicated by the presence of the SC_FL_NEED_BUFF flag and the lack of a
 * buffer, and and input buffer is assigned there (at most one). The function
 * returns 1 and wakes the stream up if a buffer was taken, otherwise zero.
 * It's designed to be called from __offer_buffer().
 */
int stream_buf_available(void *arg)
{
  struct stream *s = arg;

  if (!s->req.buf.size && !sc_ep_have_ff_data(s->scb) && s->scf->flags & SC_FL_NEED_BUFF &&
      b_alloc(&s->req.buf))
    sc_have_buff(s->scf);
  else if (!s->res.buf.size && !sc_ep_have_ff_data(s->scf) && s->scb->flags & SC_FL_NEED_BUFF &&
     b_alloc(&s->res.buf))
    sc_have_buff(s->scb);
  else
    return 0;

  task_wakeup(s->task, TASK_WOKEN_RES);
  return 1;

}

/* This function is called from the session handler which detects the end of
 * handshake, in order to complete initialization of a valid stream. It must be
 * called with a completely initialized session. It returns the pointer to
 * the newly created stream, or NULL in case of fatal error. The client-facing
 * end point is assigned to <origin>, which must be valid. The stream's task
 * is configured with a nice value inherited from the listener's nice if any.
 * The task's context is set to the new stream, and its function is set to
 * process_stream(). Target and analysers are null. <input> is used as input
 * buffer for the request channel and may contain data. On success, it is
 * transfer to the stream and <input> is set to BUF_NULL. On error, <input>
 * buffer is unchanged and it is the caller responsibility to release it.
 */
struct stream *stream_new(struct session *sess, struct stconn *sc, struct buffer *input)
{
  struct stream *s;
  struct task *t;

  DBG_TRACE_ENTER(STRM_EV_STRM_NEW);
  if (unlikely((s = pool_alloc(pool_head_stream)) == NULL))
    goto out_fail_alloc;

  /* minimum stream initialization required for an embryonic stream is
   * fairly low. We need very little to execute L4 ACLs, then we need a
   * task to make the client-side connection live on its own.
   *  - flags
   *  - stick-entry tracking
   */
  s->flags = 0;
  s->logs.logwait = sess->fe->to_log;
  s->logs.level = 0;
  s->logs.request_ts = 0;
  s->logs.t_queue = -1;
  s->logs.t_connect = -1;
  s->logs.t_data = -1;
  s->logs.t_close = 0;
  s->logs.bytes_in = s->logs.bytes_out = 0;
  s->logs.prx_queue_pos = 0;  /* we get the number of pending conns before us */
  s->logs.srv_queue_pos = 0; /* we will get this number soon */
  s->obj_type = OBJ_TYPE_STREAM;

  s->logs.accept_date = sess->accept_date;
  s->logs.accept_ts = sess->accept_ts;
  s->logs.t_handshake = sess->t_handshake;
  s->logs.t_idle = sess->t_idle;

  /* default logging function */
  s->do_log = strm_log;

  /* default error reporting function, may be changed by analysers */
  s->srv_error = default_srv_error;

  /* Initialise the current rule list pointer to NULL. We are sure that
   * any rulelist match the NULL pointer.
   */
  s->current_rule_list = NULL;
  s->current_rule = NULL;
  s->rules_exp = TICK_ETERNITY;
  s->last_rule_file = NULL;
  s->last_rule_line = 0;

  s->stkctr = NULL;
  if (pool_head_stk_ctr) {
    s->stkctr = pool_alloc(pool_head_stk_ctr);
    if (!s->stkctr)
      goto out_fail_alloc;

    /* Copy SC counters for the stream. We don't touch refcounts because
     * any reference we have is inherited from the session. Since the stream
     * doesn't exist without the session, the session's existence guarantees
     * we don't lose the entry. During the store operation, the stream won't
     * touch these ones.
     */
    memcpy(s->stkctr, sess->stkctr, sizeof(s->stkctr[0]) * global.tune.nb_stk_ctr);
  }

  s->sess = sess;

  s->stream_epoch = _HA_ATOMIC_LOAD(&stream_epoch);
  s->uniq_id = _HA_ATOMIC_FETCH_ADD(&global.req_count, 1);

  /* OK, we're keeping the stream, so let's properly initialize the stream */
  LIST_INIT(&s->back_refs);

  LIST_INIT(&s->buffer_wait.list);
  s->buffer_wait.target = s;
  s->buffer_wait.wakeup_cb = stream_buf_available;

  s->lat_time = s->cpu_time = 0;
  s->call_rate.curr_tick = s->call_rate.curr_ctr = s->call_rate.prev_ctr = 0;
  s->pcli_next_pid = 0;
  s->pcli_flags = 0;
  s->unique_id = IST_NULL;

  if ((t = task_new_here()) == NULL)
    goto out_fail_alloc;

  s->task = t;
  s->pending_events = 0;
  s->conn_retries = 0;
  s->conn_exp = TICK_ETERNITY;
  s->conn_err_type = STRM_ET_NONE;
  s->prev_conn_state = SC_ST_INI;
  t->process = process_stream;
  t->context = s;
  t->expire = TICK_ETERNITY;
  if (sess->listener)
    t->nice = sess->listener->bind_conf->nice;

  /* Note: initially, the stream's backend points to the frontend.
   * This changes later when switching rules are executed or
   * when the default backend is assigned.
   */
  s->be  = sess->fe;
  s->req_cap = NULL;
  s->res_cap = NULL;

  /* Initialize all the variables contexts even if not used.
   * This permits to prune these contexts without errors.
   *
   * We need to make sure that those lists are not re-initialized
   * by stream-dependant underlying code because we could lose
   * track of already defined variables, leading to data inconsistency
   * and memory leaks...
   *
   * For reference: we had a very old bug caused by vars_txn and
   * vars_reqres being accidentally re-initialized in http_create_txn()
   * (https://github.com/haproxy/haproxy/issues/1935)
   */
  vars_init_head(&s->vars_txn,    SCOPE_TXN);
  vars_init_head(&s->vars_reqres, SCOPE_REQ);

        /* Set SF_HTX flag for HTTP frontends. */
  if (sess->fe->mode == PR_MODE_HTTP)
    s->flags |= SF_HTX;

  s->scf = sc;
  if (sc_attach_strm(s->scf, s) < 0)
    goto out_fail_attach_scf;

  s->scb = sc_new_from_strm(s, SC_FL_ISBACK);
  if (!s->scb)
    goto out_fail_alloc_scb;

  sc_set_state(s->scf, SC_ST_EST);

  if (likely(sess->fe->options2 & PR_O2_INDEPSTR))
    s->scf->flags |= SC_FL_INDEP_STR;

  if (likely(sess->fe->options2 & PR_O2_INDEPSTR))
    s->scb->flags |= SC_FL_INDEP_STR;

  if (sc_ep_test(sc, SE_FL_WEBSOCKET))
    s->flags |= SF_WEBSOCKET;
  if (sc_conn(sc)) {
    const struct mux_ops *mux = sc_mux_ops(sc);

    if (mux && mux->flags & MX_FL_HTX)
      s->flags |= SF_HTX;
  }

  stream_init_srv_conn(s);
  s->target = sess->fe->default_target;

  s->pend_pos = NULL;
  s->priority_class = 0;
  s->priority_offset = 0;

  /* init store persistence */
  s->store_count = 0;

  channel_init(&s->req);
  s->req.flags |= CF_READ_EVENT; /* the producer is already connected */
  s->req.analysers = sess->listener ? sess->listener->bind_conf->analysers : sess->fe->fe_req_ana;

  if (IS_HTX_STRM(s)) {
    /* Be sure to have HTTP analysers because in case of
     * "destructive" stream upgrade, they may be missing (e.g
     * TCP>H2)
     */
    s->req.analysers |= AN_REQ_WAIT_HTTP|AN_REQ_HTTP_PROCESS_FE;
  }

  if (!sess->fe->fe_req_ana) {
    channel_auto_connect(&s->req);  /* don't wait to establish connection */
    channel_auto_close(&s->req);    /* let the producer forward close requests */
  }

  s->scf->ioto = sess->fe->timeout.client;
  s->req.analyse_exp = TICK_ETERNITY;

  channel_init(&s->res);
  s->res.flags |= CF_ISRESP;
  s->res.analysers = 0;

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

  s->scb->ioto = TICK_ETERNITY;
  s->res.analyse_exp = TICK_ETERNITY;

  s->txn = NULL;
  s->hlua = NULL;

  s->resolv_ctx.requester = NULL;
  s->resolv_ctx.hostname_dn = NULL;
  s->resolv_ctx.hostname_dn_len = 0;
  s->resolv_ctx.parent = NULL;

  s->tunnel_timeout = TICK_ETERNITY;

  LIST_APPEND(&th_ctx->streams, &s->list);

  if (flt_stream_init(s) < 0 || flt_stream_start(s) < 0)
    goto out_fail_accept;

  /* just in case the caller would have pre-disabled it */
  se_will_consume(s->scf->sedesc);

  if (sess->fe->accept && sess->fe->accept(s) < 0)
    goto out_fail_accept;

  if (!b_is_null(input)) {
    /* Xfer the input buffer to the request channel. <input> will
     * than point to BUF_NULL. From this point, it is the stream
     * responsibility to release it.
     */
    s->req.buf = *input;
    *input = BUF_NULL;
    s->req.total = (IS_HTX_STRM(s) ? htxbuf(&s->req.buf)->data : b_data(&s->req.buf));
    sc_ep_report_read_activity(s->scf);
  }

  /* it is important not to call the wakeup function directly but to
   * pass through task_wakeup(), because this one knows how to apply
   * priorities to tasks. Using multi thread we must be sure that
   * stream is fully initialized before calling task_wakeup. So
   * the caller must handle the task_wakeup
   */
  DBG_TRACE_LEAVE(STRM_EV_STRM_NEW, s);
  task_wakeup(s->task, TASK_WOKEN_INIT);
  return s;

  /* Error unrolling */
 out_fail_accept:
  flt_stream_release(s, 0);
  LIST_DELETE(&s->list);
  sc_free(s->scb);
 out_fail_alloc_scb:
 out_fail_attach_scf:
  task_destroy(t);
 out_fail_alloc:
  if (s)
    pool_free(pool_head_stk_ctr, s->stkctr);
  pool_free(pool_head_stream, s);
  DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_NEW|STRM_EV_STRM_ERR);
  return NULL;
}

/*
 * frees  the context associated to a stream. It must have been removed first.
 */
void stream_free(struct stream *s)
{
  struct session *sess = strm_sess(s);
  struct proxy *fe = sess->fe;
  struct bref *bref, *back;
  int i;

  DBG_TRACE_POINT(STRM_EV_STRM_FREE, s);

  /* detach the stream from its own task before even releasing it so
   * that walking over a task list never exhibits a dying stream.
   */
  s->task->context = NULL;
  __ha_barrier_store();

  pendconn_free(s);

  if (objt_server(s->target)) { /* there may be requests left pending in queue */
    if (s->flags & SF_CURR_SESS) {
      s->flags &= ~SF_CURR_SESS;
      _HA_ATOMIC_DEC(&__objt_server(s->target)->cur_sess);
    }
    if (may_dequeue_tasks(__objt_server(s->target), s->be))
      process_srv_queue(__objt_server(s->target));
  }

  if (unlikely(s->srv_conn)) {
    /* the stream still has a reserved slot on a server, but
     * it should normally be only the same as the one above,
     * so this should not happen in fact.
     */
    sess_change_server(s, NULL);
  }

  /* We may still be present in the buffer wait queue */
  if (LIST_INLIST(&s->buffer_wait.list))
    LIST_DEL_INIT(&s->buffer_wait.list);

  if (s->req.buf.size || s->res.buf.size) {
    int count = !!s->req.buf.size + !!s->res.buf.size;

    b_free(&s->req.buf);
    b_free(&s->res.buf);
    offer_buffers(NULL, count);
  }

  pool_free(pool_head_uniqueid, s->unique_id.ptr);
  s->unique_id = IST_NULL;

  flt_stream_stop(s);
  flt_stream_release(s, 0);

  hlua_ctx_destroy(s->hlua);
  s->hlua = NULL;
  if (s->txn)
    http_destroy_txn(s);

  /* ensure the client-side transport layer is destroyed */
  /* Be sure it is useless !! */
  /* if (cli_cs) */
  /*  cs_close(cli_cs); */

  for (i = 0; i < s->store_count; i++) {
    if (!s->store[i].ts)
      continue;
    stksess_free(s->store[i].table, s->store[i].ts);
    s->store[i].ts = NULL;
  }

  if (s->resolv_ctx.requester) {
    __decl_thread(struct resolvers *resolvers = s->resolv_ctx.parent->arg.resolv.resolvers);

    HA_SPIN_LOCK(DNS_LOCK, &resolvers->lock);
    ha_free(&s->resolv_ctx.hostname_dn);
    s->resolv_ctx.hostname_dn_len = 0;
    resolv_unlink_resolution(s->resolv_ctx.requester);
    HA_SPIN_UNLOCK(DNS_LOCK, &resolvers->lock);

    pool_free(resolv_requester_pool, s->resolv_ctx.requester);
    s->resolv_ctx.requester = NULL;
  }

  if (fe) {
    if (s->req_cap) {
      struct cap_hdr *h;
      for (h = fe->req_cap; h; h = h->next)
        pool_free(h->pool, s->req_cap[h->index]);
      pool_free(fe->req_cap_pool, s->req_cap);
    }

    if (s->res_cap) {
      struct cap_hdr *h;
      for (h = fe->rsp_cap; h; h = h->next)
        pool_free(h->pool, s->res_cap[h->index]);
      pool_free(fe->rsp_cap_pool, s->res_cap);
    }
  }

  /* Cleanup all variable contexts. */
  if (!LIST_ISEMPTY(&s->vars_txn.head))
    vars_prune(&s->vars_txn, s->sess, s);
  if (!LIST_ISEMPTY(&s->vars_reqres.head))
    vars_prune(&s->vars_reqres, s->sess, s);

  stream_store_counters(s);
  pool_free(pool_head_stk_ctr, s->stkctr);

  list_for_each_entry_safe(bref, back, &s->back_refs, users) {
    /* we have to unlink all watchers. We must not relink them if
     * this stream was the last one in the list. This is safe to do
     * here because we're touching our thread's list so we know
     * that other streams are not active, and the watchers will
     * only touch their node under thread isolation.
     */
    LIST_DEL_INIT(&bref->users);
    if (s->list.n != &th_ctx->streams)
      LIST_APPEND(&LIST_ELEM(s->list.n, struct stream *, list)->back_refs, &bref->users);
    bref->ref = s->list.n;
    __ha_barrier_store();
  }
  LIST_DELETE(&s->list);

  sc_destroy(s->scb);
  sc_destroy(s->scf);

  pool_free(pool_head_stream, s);

  /* We may want to free the maximum amount of pools if the proxy is stopping */
  if (fe && unlikely(fe->flags & (PR_FL_DISABLED|PR_FL_STOPPED))) {
    pool_flush(pool_head_buffer);
    pool_flush(pool_head_http_txn);
    pool_flush(pool_head_requri);
    pool_flush(pool_head_capture);
    pool_flush(pool_head_stream);
    pool_flush(pool_head_session);
    pool_flush(pool_head_connection);
    pool_flush(pool_head_pendconn);
    pool_flush(fe->req_cap_pool);
    pool_flush(fe->rsp_cap_pool);
  }
}


/* Allocates a work buffer for stream <s>. It is meant to be called inside
 * process_stream(). It will only allocate the side needed for the function
 * to work fine, which is the response buffer so that an error message may be
 * built and returned. Response buffers may be allocated from the reserve, this
 * is critical to ensure that a response may always flow and will never block a
 * server from releasing a connection. Returns 0 in case of failure, non-zero
 * otherwise.
 */
static int stream_alloc_work_buffer(struct stream *s)
{
  if (b_alloc(&s->res.buf))
    return 1;
  return 0;
}

/* releases unused buffers after processing. Typically used at the end of the
 * update() functions. It will try to wake up as many tasks/applets as the
 * number of buffers that it releases. In practice, most often streams are
 * blocked on a single buffer, so it makes sense to try to wake two up when two
 * buffers are released at once.
 */
void stream_release_buffers(struct stream *s)
{
  int offer = 0;

  if (c_size(&s->req) && c_empty(&s->req)) {
    offer++;
    b_free(&s->req.buf);
  }
  if (c_size(&s->res) && c_empty(&s->res)) {
    offer++;
    b_free(&s->res.buf);
  }

  /* if we're certain to have at least 1 buffer available, and there is
   * someone waiting, we can wake up a waiter and offer them.
   */
  if (offer)
    offer_buffers(s, offer);
}

void stream_process_counters(struct stream *s)
{
  struct session *sess = s->sess;
  unsigned long long bytes;
  int i;

  bytes = s->req.total - s->logs.bytes_in;
  s->logs.bytes_in = s->req.total;
  if (bytes) {
    _HA_ATOMIC_ADD(&sess->fe->fe_counters.bytes_in, bytes);
    _HA_ATOMIC_ADD(&s->be->be_counters.bytes_in,    bytes);

    if (objt_server(s->target))
      _HA_ATOMIC_ADD(&__objt_server(s->target)->counters.bytes_in, bytes);

    if (sess->listener && sess->listener->counters)
      _HA_ATOMIC_ADD(&sess->listener->counters->bytes_in, bytes);

    for (i = 0; i < global.tune.nb_stk_ctr; i++) {
      if (!stkctr_inc_bytes_in_ctr(&s->stkctr[i], bytes))
        stkctr_inc_bytes_in_ctr(&sess->stkctr[i], bytes);
    }
  }

  bytes = s->res.total - s->logs.bytes_out;
  s->logs.bytes_out = s->res.total;
  if (bytes) {
    _HA_ATOMIC_ADD(&sess->fe->fe_counters.bytes_out, bytes);
    _HA_ATOMIC_ADD(&s->be->be_counters.bytes_out,    bytes);

    if (objt_server(s->target))
      _HA_ATOMIC_ADD(&__objt_server(s->target)->counters.bytes_out, bytes);

    if (sess->listener && sess->listener->counters)
      _HA_ATOMIC_ADD(&sess->listener->counters->bytes_out, bytes);

    for (i = 0; i < global.tune.nb_stk_ctr; i++) {
      if (!stkctr_inc_bytes_out_ctr(&s->stkctr[i], bytes))
        stkctr_inc_bytes_out_ctr(&sess->stkctr[i], bytes);
    }
  }
}

/* Abort processing on the both channels in same time */
void stream_abort(struct stream *s)
{
  channel_abort(&s->req);
  channel_abort(&s->res);
}

/*
 * Returns a message to the client ; the connection is shut down for read,
 * and the request is cleared so that no server connection can be initiated.
 * The buffer is marked for read shutdown on the other side to protect the
 * message, and the buffer write is enabled. The message is contained in a
 * "chunk". If it is null, then an empty message is used. The reply buffer does
 * not need to be empty before this, and its contents will not be overwritten.
 * The primary goal of this function is to return error messages to a client.
 */
void stream_retnclose(struct stream *s, const struct buffer *msg)
{
  struct channel *ic = &s->req;
  struct channel *oc = &s->res;

  channel_auto_read(ic);
  channel_abort(ic);
  channel_erase(ic);
  channel_truncate(oc);

  if (likely(msg && msg->data))
    co_inject(oc, msg->area, msg->data);

  channel_auto_read(oc);
  channel_auto_close(oc);
  sc_schedule_abort(s->scb);
}

int stream_set_timeout(struct stream *s, enum act_timeout_name name, int timeout)
{
  switch (name) {
  case ACT_TIMEOUT_CLIENT:
    s->scf->ioto = timeout;
    return 1;

  case ACT_TIMEOUT_SERVER:
    s->scb->ioto = timeout;
    return 1;

  case ACT_TIMEOUT_TUNNEL:
    s->tunnel_timeout = timeout;
    return 1;

  default:
    return 0;
  }
}

/*
 * This function handles the transition between the SC_ST_CON state and the
 * SC_ST_EST state. It must only be called after switching from SC_ST_CON (or
 * SC_ST_INI or SC_ST_RDY) to SC_ST_EST, but only when a ->proto is defined.
 * Note that it will switch the interface to SC_ST_DIS if we already have
 * the SC_FL_ABRT_DONE flag, it means we were able to forward the request, and
 * receive the response, before process_stream() had the opportunity to
 * make the switch from SC_ST_CON to SC_ST_EST. When that happens, we want
 * to go through back_establish() anyway, to make sure the analysers run.
 * Timeouts are cleared. Error are reported on the channel so that analysers
 * can handle them.
 */
static void back_establish(struct stream *s)
{
  struct connection *conn = sc_conn(s->scb);
  struct channel *req = &s->req;
  struct channel *rep = &s->res;

  DBG_TRACE_ENTER(STRM_EV_STRM_PROC|STRM_EV_CS_ST, s);
  /* First, centralize the timers information, and clear any irrelevant
   * timeout.
   */
  s->logs.t_connect = ns_to_ms(now_ns - s->logs.accept_ts);
  s->conn_exp = TICK_ETERNITY;
  s->flags &= ~SF_CONN_EXP;

  /* errors faced after sending data need to be reported */
  if ((s->scb->flags & SC_FL_ERROR) && req->flags & CF_WROTE_DATA) {
    s->req.flags |= CF_WRITE_EVENT;
    s->res.flags |= CF_READ_EVENT;
    s->conn_err_type = STRM_ET_DATA_ERR;
    DBG_TRACE_STATE("read/write error", STRM_EV_STRM_PROC|STRM_EV_CS_ST|STRM_EV_STRM_ERR, s);
  }

  if (objt_server(s->target))
    health_adjust(__objt_server(s->target), HANA_STATUS_L4_OK);

  if (!IS_HTX_STRM(s)) { /* let's allow immediate data connection in this case */
    /* if the user wants to log as soon as possible, without counting
     * bytes from the server, then this is the right moment. */
    if (!LIST_ISEMPTY(&strm_fe(s)->logformat) && !(s->logs.logwait & LW_BYTES)) {
      /* note: no pend_pos here, session is established */
      s->logs.t_close = s->logs.t_connect; /* to get a valid end date */
      s->do_log(s);
    }
  }
  else {
    s->scb->flags |= SC_FL_RCV_ONCE; /* a single read is enough to get response headers */
  }

  rep->analysers |= strm_fe(s)->fe_rsp_ana | s->be->be_rsp_ana;

  se_have_more_data(s->scb->sedesc);
  rep->flags |= CF_READ_EVENT; /* producer is now attached */
  sc_ep_report_read_activity(s->scb);
  if (conn) {
    /* real connections have timeouts
     * if already defined, it means that a set-timeout rule has
     * been executed so do not overwrite them
     */
    if (!tick_isset(s->scb->ioto))
      s->scb->ioto = s->be->timeout.server;
    if (!tick_isset(s->tunnel_timeout))
      s->tunnel_timeout = s->be->timeout.tunnel;

    /* The connection is now established, try to read data from the
     * underlying layer, and subscribe to recv events. We use a
     * delayed recv here to give a chance to the data to flow back
     * by the time we process other tasks.
     */
    sc_chk_rcv(s->scb);
  }
  /* If we managed to get the whole response, and we don't have anything
   * left to send, or can't, switch to SC_ST_DIS now. */
  if ((s->scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) || (s->scf->flags & SC_FL_SHUT_DONE)) {
    s->scb->state = SC_ST_DIS;
    DBG_TRACE_STATE("response channel shutdwn for read/write", STRM_EV_STRM_PROC|STRM_EV_CS_ST|STRM_EV_STRM_ERR, s);
  }

  DBG_TRACE_LEAVE(STRM_EV_STRM_PROC|STRM_EV_CS_ST, s);
}

/* Set correct stream termination flags in case no analyser has done it. It
 * also counts a failed request if the server state has not reached the request
 * stage.
 */
void sess_set_term_flags(struct stream *s)
{
  if (!(s->flags & SF_FINST_MASK)) {
    if (s->scb->state == SC_ST_INI) {
      /* anything before REQ in fact */
      _HA_ATOMIC_INC(&strm_fe(s)->fe_counters.failed_req);
      if (strm_li(s) && strm_li(s)->counters)
        _HA_ATOMIC_INC(&strm_li(s)->counters->failed_req);

      s->flags |= SF_FINST_R;
    }
    else if (s->scb->state == SC_ST_QUE)
      s->flags |= SF_FINST_Q;
    else if (sc_state_in(s->scb->state, SC_SB_REQ|SC_SB_TAR|SC_SB_ASS|SC_SB_CON|SC_SB_CER|SC_SB_RDY))
      s->flags |= SF_FINST_C;
    else if (s->scb->state == SC_ST_EST || s->prev_conn_state == SC_ST_EST)
      s->flags |= SF_FINST_D;
    else
      s->flags |= SF_FINST_L;
  }
}

/* This function parses the use-service action ruleset. It executes
 * the associated ACL and set an applet as a stream or txn final node.
 * it returns ACT_RET_ERR if an error occurs, the proxy left in
 * consistent state. It returns ACT_RET_STOP in success case because
 * use-service must be a terminal action. Returns ACT_RET_YIELD
 * if the initialisation function require more data.
 */
enum act_return process_use_service(struct act_rule *rule, struct proxy *px,
                                    struct session *sess, struct stream *s, int flags)

{
  struct appctx *appctx;

  /* Initialises the applet if it is required. */
  if (flags & ACT_OPT_FIRST) {
    /* Register applet. this function schedules the applet. */
    s->target = &rule->applet.obj_type;
    appctx = sc_applet_create(s->scb, objt_applet(s->target));
    if (unlikely(!appctx))
      return ACT_RET_ERR;

    /* Finish initialisation of the context. */
    appctx->rule = rule;
    if (appctx_init(appctx) == -1)
      return ACT_RET_ERR;
  }
  else
    appctx = __sc_appctx(s->scb);

  if (rule->from != ACT_F_HTTP_REQ) {
    if (sess->fe == s->be) /* report it if the request was intercepted by the frontend */
      _HA_ATOMIC_INC(&sess->fe->fe_counters.intercepted_req);

    /* The flag SF_ASSIGNED prevent from server assignment. */
    s->flags |= SF_ASSIGNED;
  }

  /* Now we can schedule the applet. */
  applet_need_more_data(appctx);
  appctx_wakeup(appctx);
  return ACT_RET_STOP;
}

/* This stream analyser checks the switching rules and changes the backend
 * if appropriate. The default_backend rule is also considered, then the
 * target backend's forced persistence rules are also evaluated last if any.
 * It returns 1 if the processing can continue on next analysers, or zero if it
 * either needs more data or wants to immediately abort the request.
 */
static int process_switching_rules(struct stream *s, struct channel *req, int an_bit)
{
  struct persist_rule *prst_rule;
  struct session *sess = s->sess;
  struct proxy *fe = sess->fe;

  req->analysers &= ~an_bit;
  req->analyse_exp = TICK_ETERNITY;

  DBG_TRACE_ENTER(STRM_EV_STRM_ANA, s);

  /* now check whether we have some switching rules for this request */
  if (!(s->flags & SF_BE_ASSIGNED)) {
    struct switching_rule *rule;

    list_for_each_entry(rule, &fe->switching_rules, list) {
      int ret = 1;

      if (rule->cond) {
        ret = acl_exec_cond(rule->cond, fe, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
        ret = acl_pass(ret);
        if (rule->cond->pol == ACL_COND_UNLESS)
          ret = !ret;
      }

      if (ret) {
        /* If the backend name is dynamic, try to resolve the name.
         * If we can't resolve the name, or if any error occurs, break
         * the loop and fallback to the default backend.
         */
        struct proxy *backend = NULL;

        if (rule->dynamic) {
          struct buffer *tmp;

          tmp = alloc_trash_chunk();
          if (!tmp)
            goto sw_failed;

          if (build_logline(s, tmp->area, tmp->size, &rule->be.expr))
            backend = proxy_be_by_name(tmp->area);

          free_trash_chunk(tmp);
          tmp = NULL;

          if (!backend)
            break;
        }
        else
          backend = rule->be.backend;

        if (!stream_set_backend(s, backend))
          goto sw_failed;
        break;
      }
    }

    /* To ensure correct connection accounting on the backend, we
     * have to assign one if it was not set (eg: a listen). This
     * measure also takes care of correctly setting the default
     * backend if any. Don't do anything if an upgrade is already in
     * progress.
     */
    if (!(s->flags & (SF_BE_ASSIGNED|SF_IGNORE)))
      if (!stream_set_backend(s, fe->defbe.be ? fe->defbe.be : s->be))
        goto sw_failed;

    /* No backend assigned but no error reported. It happens when a
     * TCP stream is upgraded to HTTP/2.
     */
    if ((s->flags & (SF_BE_ASSIGNED|SF_IGNORE)) == SF_IGNORE) {
      DBG_TRACE_DEVEL("leaving with no backend because of a destructive upgrade", STRM_EV_STRM_ANA, s);
      return 0;
    }

  }

  /* we don't want to run the TCP or HTTP filters again if the backend has not changed */
  if (fe == s->be) {
    s->req.analysers &= ~AN_REQ_INSPECT_BE;
    s->req.analysers &= ~AN_REQ_HTTP_PROCESS_BE;
    s->req.analysers &= ~AN_REQ_FLT_START_BE;
  }

  /* as soon as we know the backend, we must check if we have a matching forced or ignored
   * persistence rule, and report that in the stream.
   */
  list_for_each_entry(prst_rule, &s->be->persist_rules, list) {
    int ret = 1;

    if (prst_rule->cond) {
                  ret = acl_exec_cond(prst_rule->cond, s->be, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
      ret = acl_pass(ret);
      if (prst_rule->cond->pol == ACL_COND_UNLESS)
        ret = !ret;
    }

    if (ret) {
      /* no rule, or the rule matches */
      if (prst_rule->type == PERSIST_TYPE_FORCE) {
        s->flags |= SF_FORCE_PRST;
      } else {
        s->flags |= SF_IGNORE_PRST;
      }
      break;
    }
  }

  DBG_TRACE_LEAVE(STRM_EV_STRM_ANA, s);
  return 1;

 sw_failed:
  /* immediately abort this request in case of allocation failure */
  stream_abort(s);

  if (!(s->flags & SF_ERR_MASK))
    s->flags |= SF_ERR_RESOURCE;
  if (!(s->flags & SF_FINST_MASK))
    s->flags |= SF_FINST_R;

  if (s->txn)
    s->txn->status = 500;
  s->req.analysers &= AN_REQ_FLT_END;
  s->req.analyse_exp = TICK_ETERNITY;
  DBG_TRACE_DEVEL("leaving on error", STRM_EV_STRM_ANA|STRM_EV_STRM_ERR, s);
  return 0;
}

/* This stream analyser works on a request. It applies all use-server rules on
 * it then returns 1. The data must already be present in the buffer otherwise
 * they won't match. It always returns 1.
 */
static int process_server_rules(struct stream *s, struct channel *req, int an_bit)
{
  struct proxy *px = s->be;
  struct session *sess = s->sess;
  struct server_rule *rule;

  DBG_TRACE_ENTER(STRM_EV_STRM_ANA, s);

  if (!(s->flags & SF_ASSIGNED)) {
    list_for_each_entry(rule, &px->server_rules, list) {
      int ret;

      ret = acl_exec_cond(rule->cond, s->be, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
      ret = acl_pass(ret);
      if (rule->cond->pol == ACL_COND_UNLESS)
        ret = !ret;

      if (ret) {
        struct server *srv;

        if (rule->dynamic) {
          struct buffer *tmp = get_trash_chunk();

          if (!build_logline(s, tmp->area, tmp->size, &rule->expr))
            break;

          srv = findserver(s->be, tmp->area);
          if (!srv)
            break;
        }
        else
          srv = rule->srv.ptr;

        if ((srv->cur_state != SRV_ST_STOPPED) ||
            (px->options & PR_O_PERSIST) ||
            (s->flags & SF_FORCE_PRST)) {
          s->flags |= SF_DIRECT | SF_ASSIGNED;
          s->target = &srv->obj_type;
          break;
        }
        /* if the server is not UP, let's go on with next rules
         * just in case another one is suited.
         */
      }
    }
  }

  req->analysers &= ~an_bit;
  req->analyse_exp = TICK_ETERNITY;
  DBG_TRACE_LEAVE(STRM_EV_STRM_ANA, s);
  return 1;
}

static inline void sticking_rule_find_target(struct stream *s,
                                             struct stktable *t, struct stksess *ts)
{
  struct proxy *px = s->be;
  struct eb32_node *node;
  struct dict_entry *de;
  void *ptr;
  struct server *srv;

  /* Look for the server name previously stored in <t> stick-table */
  HA_RWLOCK_RDLOCK(STK_SESS_LOCK, &ts->lock);
  ptr = __stktable_data_ptr(t, ts, STKTABLE_DT_SERVER_KEY);
  de = stktable_data_cast(ptr, std_t_dict);
  HA_RWLOCK_RDUNLOCK(STK_SESS_LOCK, &ts->lock);

  if (de) {
    struct ebpt_node *node;

    if (t->server_key_type == STKTABLE_SRV_NAME) {
      node = ebis_lookup(&px->conf.used_server_name, de->value.key);
      if (node) {
        srv = container_of(node, struct server, conf.name);
        goto found;
      }
    } else if (t->server_key_type == STKTABLE_SRV_ADDR) {
      HA_RWLOCK_RDLOCK(PROXY_LOCK, &px->lock);
      node = ebis_lookup(&px->used_server_addr, de->value.key);
      HA_RWLOCK_RDUNLOCK(PROXY_LOCK, &px->lock);
      if (node) {
        srv = container_of(node, struct server, addr_node);
        goto found;
      }
    }
  }

  /* Look for the server ID */
  HA_RWLOCK_RDLOCK(STK_SESS_LOCK, &ts->lock);
  ptr = __stktable_data_ptr(t, ts, STKTABLE_DT_SERVER_ID);
  node = eb32_lookup(&px->conf.used_server_id, stktable_data_cast(ptr, std_t_sint));
  HA_RWLOCK_RDUNLOCK(STK_SESS_LOCK, &ts->lock);

  if (!node)
    return;

  srv = container_of(node, struct server, conf.id);
 found:
  if ((srv->cur_state != SRV_ST_STOPPED) ||
      (px->options & PR_O_PERSIST) || (s->flags & SF_FORCE_PRST)) {
    s->flags |= SF_DIRECT | SF_ASSIGNED;
    s->target = &srv->obj_type;
  }
}

/* This stream analyser works on a request. It applies all sticking rules on
 * it then returns 1. The data must already be present in the buffer otherwise
 * they won't match. It always returns 1.
 */
static int process_sticking_rules(struct stream *s, struct channel *req, int an_bit)
{
  struct proxy    *px   = s->be;
  struct session *sess  = s->sess;
  struct sticking_rule  *rule;

  DBG_TRACE_ENTER(STRM_EV_STRM_ANA, s);

  list_for_each_entry(rule, &px->sticking_rules, list) {
    int ret = 1 ;
    int i;

    /* Only the first stick store-request of each table is applied
     * and other ones are ignored. The purpose is to allow complex
     * configurations which look for multiple entries by decreasing
     * order of precision and to stop at the first which matches.
     * An example could be a store of the IP address from an HTTP
     * header first, then from the source if not found.
     */
    if (rule->flags & STK_IS_STORE) {
      for (i = 0; i < s->store_count; i++) {
        if (rule->table.t == s->store[i].table)
          break;
      }

      if (i !=  s->store_count)
        continue;
    }

    if (rule->cond) {
                  ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL);
      ret = acl_pass(ret);
      if (rule->cond->pol == ACL_COND_UNLESS)
        ret = !ret;
    }

    if (ret) {
      struct stktable_key *key;

      key = stktable_fetch_key(rule->table.t, px, sess, s, SMP_OPT_DIR_REQ|SMP_OPT_FINAL, rule->expr, NULL);
      if (!key)
        continue;

      if (rule->flags & STK_IS_MATCH) {
        struct stksess *ts;

        if ((ts = stktable_lookup_key(rule->table.t, key)) != NULL) {
          if (!(s->flags & SF_ASSIGNED))
            sticking_rule_find_target(s, rule->table.t, ts);
          stktable_touch_local(rule->table.t, ts, 1);
        }
      }
      if (rule->flags & STK_IS_STORE) {
        if (s->store_count < (sizeof(s->store) / sizeof(s->store[0]))) {
          struct stksess *ts;

          ts = stksess_new(rule->table.t, key);
          if (ts) {
            s->store[s->store_count].table = rule->table.t;
            s->store[s->store_count++].ts = ts;
          }
        }
      }
    }
  }

  req->analysers &= ~an_bit;
  req->analyse_exp = TICK_ETERNITY;
  DBG_TRACE_LEAVE(STRM_EV_STRM_ANA, s);
  return 1;
}

/* This stream analyser works on a response. It applies all store rules on it
 * then returns 1. The data must already be present in the buffer otherwise
 * they won't match. It always returns 1.
 */
static int process_store_rules(struct stream *s, struct channel *rep, int an_bit)
{
  struct proxy    *px   = s->be;
  struct session *sess  = s->sess;
  struct sticking_rule  *rule;
  int i;
  int nbreq = s->store_count;

  DBG_TRACE_ENTER(STRM_EV_STRM_ANA, s);

  list_for_each_entry(rule, &px->storersp_rules, list) {
    int ret = 1 ;

    /* Only the first stick store-response of each table is applied
     * and other ones are ignored. The purpose is to allow complex
     * configurations which look for multiple entries by decreasing
     * order of precision and to stop at the first which matches.
     * An example could be a store of a set-cookie value, with a
     * fallback to a parameter found in a 302 redirect.
     *
     * The store-response rules are not allowed to override the
     * store-request rules for the same table, but they may coexist.
     * Thus we can have up to one store-request entry and one store-
     * response entry for the same table at any time.
     */
    for (i = nbreq; i < s->store_count; i++) {
      if (rule->table.t == s->store[i].table)
        break;
    }

    /* skip existing entries for this table */
    if (i < s->store_count)
      continue;

    if (rule->cond) {
                  ret = acl_exec_cond(rule->cond, px, sess, s, SMP_OPT_DIR_RES|SMP_OPT_FINAL);
                  ret = acl_pass(ret);
      if (rule->cond->pol == ACL_COND_UNLESS)
        ret = !ret;
    }

    if (ret) {
      struct stktable_key *key;

      key = stktable_fetch_key(rule->table.t, px, sess, s, SMP_OPT_DIR_RES|SMP_OPT_FINAL, rule->expr, NULL);
      if (!key)
        continue;

      if (s->store_count < (sizeof(s->store) / sizeof(s->store[0]))) {
        struct stksess *ts;

        ts = stksess_new(rule->table.t, key);
        if (ts) {
          s->store[s->store_count].table = rule->table.t;
          s->store[s->store_count++].ts = ts;
        }
      }
    }
  }

  /* process store request and store response */
  for (i = 0; i < s->store_count; i++) {
    struct stksess *ts;
    void *ptr;
    char *key;
    struct dict_entry *de;
    struct stktable *t = s->store[i].table;

    if (!objt_server(s->target) || (__objt_server(s->target)->flags & SRV_F_NON_STICK)) {
      stksess_free(s->store[i].table, s->store[i].ts);
      s->store[i].ts = NULL;
      continue;
    }

    ts = stktable_set_entry(t, s->store[i].ts);
    if (ts != s->store[i].ts) {
      /* the entry already existed, we can free ours */
      stksess_free(t, s->store[i].ts);
    }
    s->store[i].ts = NULL;

    if (t->server_key_type == STKTABLE_SRV_NAME)
      key = __objt_server(s->target)->id;
    else if (t->server_key_type == STKTABLE_SRV_ADDR)
      key = __objt_server(s->target)->addr_node.key;
    else
      key = NULL;

    HA_RWLOCK_WRLOCK(STK_SESS_LOCK, &ts->lock);
    ptr = __stktable_data_ptr(t, ts, STKTABLE_DT_SERVER_ID);
    stktable_data_cast(ptr, std_t_sint) = __objt_server(s->target)->puid;

    if (key) {
      de = dict_insert(&server_key_dict, key);
      if (de) {
        ptr = __stktable_data_ptr(t, ts, STKTABLE_DT_SERVER_KEY);
        stktable_data_cast(ptr, std_t_dict) = de;
      }
    }

    HA_RWLOCK_WRUNLOCK(STK_SESS_LOCK, &ts->lock);

    stktable_touch_local(t, ts, 1);
  }
  s->store_count = 0; /* everything is stored */

  rep->analysers &= ~an_bit;
  rep->analyse_exp = TICK_ETERNITY;

  DBG_TRACE_LEAVE(STRM_EV_STRM_ANA, s);
  return 1;
}

/* Set the stream to HTTP mode, if necessary. The minimal request HTTP analysers
 * are set and the client mux is upgraded. It returns 1 if the stream processing
 * may continue or 0 if it should be stopped. It happens on error or if the
 * upgrade required a new stream. The mux protocol may be specified.
 */
int stream_set_http_mode(struct stream *s, const struct mux_proto_list *mux_proto)
{
  struct stconn *sc = s->scf;
  struct connection  *conn;

  /* Already an HTTP stream */
  if (IS_HTX_STRM(s))
    return 1;

  s->req.analysers |= AN_REQ_WAIT_HTTP|AN_REQ_HTTP_PROCESS_FE;

  if (unlikely(!s->txn && !http_create_txn(s)))
    return 0;

  conn = sc_conn(sc);
  if (conn) {
    se_have_more_data(s->scf->sedesc);
    /* Make sure we're unsubscribed, the the new
     * mux will probably want to subscribe to
     * the underlying XPRT
     */
    if (s->scf->wait_event.events)
      conn->mux->unsubscribe(sc, s->scf->wait_event.events, &(s->scf->wait_event));

    if (conn->mux->flags & MX_FL_NO_UPG)
      return 0;

    sc_conn_prepare_endp_upgrade(sc);
    if (conn_upgrade_mux_fe(conn, sc, &s->req.buf,
          (mux_proto ? mux_proto->token : ist("")),
          PROTO_MODE_HTTP)  == -1) {
      sc_conn_abort_endp_upgrade(sc);
      return 0;
    }
    sc_conn_commit_endp_upgrade(sc);

    s->req.flags &= ~(CF_READ_EVENT|CF_AUTO_CONNECT);
    s->req.total = 0;
    s->flags |= SF_IGNORE;
    if (sc_ep_test(sc, SE_FL_DETACHED)) {
      /* If stream connector is detached, it means it was not
       * reused by the new mux. Son destroy it, disable
       * logging, and abort the stream process. Thus the
       * stream will be silently destroyed. The new mux will
       * create new streams.
       */
      s->logs.logwait = 0;
      s->logs.level = 0;
      stream_abort(s);
      s->req.analysers &= AN_REQ_FLT_END;
      s->req.analyse_exp = TICK_ETERNITY;
    }
  }

  return 1;
}


/* Updates at once the channel flags, and timers of both stream connectors of a
 * same stream, to complete the work after the analysers, then updates the data
 * layer below. This will ensure that any synchronous update performed at the
 * data layer will be reflected in the channel flags and/or stream connector.
 * Note that this does not change the stream connector's current state, though
 * it updates the previous state to the current one.
 */
static void stream_update_both_sc(struct stream *s)
{
  struct stconn *scf = s->scf;
  struct stconn *scb = s->scb;
  struct channel *req = &s->req;
  struct channel *res = &s->res;

  req->flags &= ~(CF_READ_EVENT|CF_WRITE_EVENT);
  res->flags &= ~(CF_READ_EVENT|CF_WRITE_EVENT);

  s->prev_conn_state = scb->state;

  /* let's recompute both sides states */
  if (sc_state_in(scf->state, SC_SB_RDY|SC_SB_EST))
    sc_update(scf);

  if (sc_state_in(scb->state, SC_SB_RDY|SC_SB_EST))
    sc_update(scb);

  /* stream connectors are processed outside of process_stream() and must be
   * handled at the latest moment.
   */
  if (sc_appctx(scf)) {
    if (sc_is_recv_allowed(scf) || sc_is_send_allowed(scf))
      appctx_wakeup(__sc_appctx(scf));
  }
  if (sc_appctx(scb)) {
    if (sc_is_recv_allowed(scb) || sc_is_send_allowed(scb))
      appctx_wakeup(__sc_appctx(scb));
  }
}

/* check SC and channel timeouts, and close the corresponding stream connectors
 * for future reads or writes.
 * Note: this will also concern upper layers but we do not touch any other
 * flag. We must be careful and correctly detect state changes when calling
 * them.
 */
static void stream_handle_timeouts(struct stream *s)
{
  stream_check_conn_timeout(s);

  sc_check_timeouts(s->scf);
  channel_check_timeout(&s->req);
  sc_check_timeouts(s->scb);
  channel_check_timeout(&s->res);

  if (unlikely(!(s->scb->flags & SC_FL_SHUT_DONE) && (s->req.flags & CF_WRITE_TIMEOUT))) {
    s->scb->flags |= SC_FL_NOLINGER;
    sc_shutdown(s->scb);
  }

  if (unlikely(!(s->scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) && (s->req.flags & CF_READ_TIMEOUT))) {
    if (s->scf->flags & SC_FL_NOHALF)
      s->scf->flags |= SC_FL_NOLINGER;
    sc_abort(s->scf);
  }
  if (unlikely(!(s->scf->flags & SC_FL_SHUT_DONE) && (s->res.flags & CF_WRITE_TIMEOUT))) {
    s->scf->flags |= SC_FL_NOLINGER;
    sc_shutdown(s->scf);
  }

  if (unlikely(!(s->scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) && (s->res.flags & CF_READ_TIMEOUT))) {
    if (s->scb->flags & SC_FL_NOHALF)
      s->scb->flags |= SC_FL_NOLINGER;
    sc_abort(s->scb);
  }

  if (HAS_FILTERS(s))
    flt_stream_check_timeouts(s);
}

/* if the current task's wake_date was set, it's being profiled, thus we may
 * report latencies and CPU usages in logs, so it's desirable to update the
 * latency when entering process_stream().
 */
static void stream_cond_update_cpu_latency(struct stream *s)
{
  uint32_t lat = th_ctx->sched_call_date - th_ctx->sched_wake_date;

  s->lat_time += lat;
}

/* if the current task's wake_date was set, it's being profiled, thus we may
 * report latencies and CPU usages in logs, so it's desirable to do that before
 * logging in order to report accurate CPU usage. In this case we count that
 * final part and reset the wake date so that the scheduler doesn't do it a
 * second time, and by doing so we also avoid an extra call to clock_gettime().
 * The CPU usage will be off by the little time needed to run over stream_free()
 * but that's only marginal.
 */
static void stream_cond_update_cpu_usage(struct stream *s)
{
  uint32_t cpu;

  /* stats are only registered for non-zero wake dates */
  if (likely(!th_ctx->sched_wake_date))
    return;

  cpu = (uint32_t)now_mono_time() - th_ctx->sched_call_date;
  s->cpu_time += cpu;
  HA_ATOMIC_ADD(&th_ctx->sched_profile_entry->cpu_time, cpu);
  th_ctx->sched_wake_date = 0;
}

/* this functions is called directly by the scheduler for tasks whose
 * ->process points to process_stream(), and is used to keep latencies
 * and CPU usage measurements accurate.
 */
void stream_update_timings(struct task *t, uint64_t lat, uint64_t cpu)
{
  struct stream *s = t->context;
  s->lat_time += lat;
  s->cpu_time += cpu;
}


/* This macro is very specific to the function below. See the comments in
 * process_stream() below to understand the logic and the tests.
 */
#define UPDATE_ANALYSERS(real, list, back, flag) {     \
    list = (((list) & ~(flag)) | ~(back)) & (real);   \
    back = real;            \
    if (!(list))           \
      break;           \
    if (((list) ^ ((list) & ((list) - 1))) < (flag)) \
      continue;         \
}

/* These 2 following macros call an analayzer for the specified channel if the
 * right flag is set. The first one is used for "filterable" analyzers. If a
 * stream has some registered filters, pre and post analyaze callbacks are
 * called. The second are used for other analyzers (AN_REQ/RES_FLT_* and
 * AN_REQ/RES_HTTP_XFER_BODY) */
#define FLT_ANALYZE(strm, chn, fun, list, back, flag, ...)      \
  {                 \
    if ((list) & (flag)) {           \
      if (HAS_FILTERS(strm)) {             \
        if (!flt_pre_analyze((strm), (chn), (flag)))    \
          break;               \
        if (!fun((strm), (chn), (flag), ##__VA_ARGS__)) \
          break;         \
        if (!flt_post_analyze((strm), (chn), (flag))) \
          break;         \
      }             \
      else {             \
        if (!fun((strm), (chn), (flag), ##__VA_ARGS__)) \
          break;         \
      }             \
      UPDATE_ANALYSERS((chn)->analysers, (list),    \
           (back), (flag));     \
    }                \
  }

#define ANALYZE(strm, chn, fun, list, back, flag, ...)      \
  {               \
    if ((list) & (flag)) {         \
      if (!fun((strm), (chn), (flag), ##__VA_ARGS__)) \
        break;         \
      UPDATE_ANALYSERS((chn)->analysers, (list),  \
           (back), (flag));   \
    }              \
  }

/* Processes the client, server, request and response jobs of a stream task,
 * then puts it back to the wait queue in a clean state, or cleans up its
 * resources if it must be deleted. Returns in <next> the date the task wants
 * to be woken up, or TICK_ETERNITY. In order not to call all functions for
 * nothing too many times, the request and response buffers flags are monitored
 * and each function is called only if at least another function has changed at
 * least one flag it is interested in.
 */
struct task *process_stream(struct task *t, void *context, unsigned int state)
{
  struct server *srv;
  struct stream *s = context;
  struct session *sess = s->sess;
  unsigned int scf_flags, scb_flags;
  unsigned int rqf_last, rpf_last;
  unsigned int rq_prod_last, rq_cons_last;
  unsigned int rp_cons_last, rp_prod_last;
  unsigned int req_ana_back, res_ana_back;
  struct channel *req, *res;
  struct stconn *scf, *scb;
  unsigned int rate;

  DBG_TRACE_ENTER(STRM_EV_STRM_PROC, s);

  activity[tid].stream_calls++;
  stream_cond_update_cpu_latency(s);

  req = &s->req;
  res = &s->res;

  scf = s->scf;
  scb = s->scb;

  /* First, attempt to receive pending data from I/O layers */
  sc_conn_sync_recv(scf);
  sc_conn_sync_recv(scb);

  /* Let's check if we're looping without making any progress, e.g. due
   * to a bogus analyser or the fact that we're ignoring a read0. The
   * call_rate counter only counts calls with no progress made.
   */
  if (!((req->flags | res->flags) & (CF_READ_EVENT|CF_WRITE_EVENT))) {
    rate = update_freq_ctr(&s->call_rate, 1);
    if (rate >= 100000 && s->call_rate.prev_ctr) // make sure to wait at least a full second
      stream_dump_and_crash(&s->obj_type, read_freq_ctr(&s->call_rate));
  }

  /* this data may be no longer valid, clear it */
  if (s->txn)
    memset(&s->txn->auth, 0, sizeof(s->txn->auth));

  /* This flag must explicitly be set every time */
  req->flags &= ~CF_WAKE_WRITE;
  res->flags &= ~CF_WAKE_WRITE;

  /* Keep a copy of req/rep flags so that we can detect shutdowns */
  rqf_last = req->flags & ~CF_MASK_ANALYSER;
  rpf_last = res->flags & ~CF_MASK_ANALYSER;

  /* we don't want the stream connector functions to recursively wake us up */
  scf->flags |= SC_FL_DONT_WAKE;
  scb->flags |= SC_FL_DONT_WAKE;

  /* Keep a copy of SC flags */
  scf_flags = scf->flags;
  scb_flags = scb->flags;

  /* update pending events */
  s->pending_events |= (state & TASK_WOKEN_ANY);

  /* 1a: Check for low level timeouts if needed. We just set a flag on
   * stream connectors when their timeouts have expired.
   */
  if (unlikely(s->pending_events & TASK_WOKEN_TIMER)) {
    stream_handle_timeouts(s);

    /* Once in a while we're woken up because the task expires. But
     * this does not necessarily mean that a timeout has been reached.
     * So let's not run a whole stream processing if only an expiration
     * timeout needs to be refreshed.
     */
    if (!((scf->flags | scb->flags) & (SC_FL_ERROR|SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_SHUT_DONE)) &&
        !((req->flags | res->flags) & (CF_READ_EVENT|CF_READ_TIMEOUT|CF_WRITE_EVENT|CF_WRITE_TIMEOUT)) &&
        !(s->flags & SF_CONN_EXP) &&
        ((s->pending_events & TASK_WOKEN_ANY) == TASK_WOKEN_TIMER)) {
      scf->flags &= ~SC_FL_DONT_WAKE;
      scb->flags &= ~SC_FL_DONT_WAKE;
      goto update_exp_and_leave;
    }
  }

 resync_stconns:
  /* below we may emit error messages so we have to ensure that we have
   * our buffers properly allocated. If the allocation failed, an error is
   * triggered.
   *
   * NOTE: An error is returned because the mechanism to queue entities
   *       waiting for a buffer is totally broken for now. However, this
   *       part must be refactored. When it will be handled, this part
   *       must be be reviewed too.
   */
  if (!stream_alloc_work_buffer(s)) {
    scf->flags |= SC_FL_ERROR;
    s->conn_err_type = STRM_ET_CONN_RES;

    scb->flags |= SC_FL_ERROR;
    s->conn_err_type = STRM_ET_CONN_RES;

    if (!(s->flags & SF_ERR_MASK))
      s->flags |= SF_ERR_RESOURCE;
    sess_set_term_flags(s);
  }

  /* 1b: check for low-level errors reported at the stream connector.
   * First we check if it's a retryable error (in which case we don't
   * want to tell the buffer). Otherwise we report the error one level
   * upper by setting flags into the buffers. Note that the side towards
   * the client cannot have connect (hence retryable) errors. Also, the
   * connection setup code must be able to deal with any type of abort.
   */
  srv = objt_server(s->target);
  if (unlikely(scf->flags & SC_FL_ERROR)) {
    if (sc_state_in(scf->state, SC_SB_EST|SC_SB_DIS)) {
      sc_abort(scf);
      sc_shutdown(scf);
      //sc_report_error(scf); TODO: Be sure it is useless
      if (!(req->analysers) && !(res->analysers)) {
        _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.cli_aborts);
        if (!(s->flags & SF_ERR_MASK))
          s->flags |= SF_ERR_CLICL;
        if (!(s->flags & SF_FINST_MASK))
          s->flags |= SF_FINST_D;
      }
    }
  }

  if (unlikely(scb->flags & SC_FL_ERROR)) {
    if (sc_state_in(scb->state, SC_SB_EST|SC_SB_DIS)) {
      sc_abort(scb);
      sc_shutdown(scb);
      //sc_report_error(scb); TODO: Be sure it is useless
      _HA_ATOMIC_INC(&s->be->be_counters.failed_resp);
      if (srv)
        _HA_ATOMIC_INC(&srv->counters.failed_resp);
      if (!(req->analysers) && !(res->analysers)) {
        _HA_ATOMIC_INC(&s->be->be_counters.srv_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.srv_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->srv_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.srv_aborts);
        if (!(s->flags & SF_ERR_MASK))
          s->flags |= SF_ERR_SRVCL;
        if (!(s->flags & SF_FINST_MASK))
          s->flags |= SF_FINST_D;
      }
    }
    /* note: maybe we should process connection errors here ? */
  }

  if (sc_state_in(scb->state, SC_SB_CON|SC_SB_RDY)) {
    /* we were trying to establish a connection on the server side,
     * maybe it succeeded, maybe it failed, maybe we timed out, ...
     */
    if (scb->state == SC_ST_RDY)
      back_handle_st_rdy(s);
    else if (s->scb->state == SC_ST_CON)
      back_handle_st_con(s);

    if (scb->state == SC_ST_CER)
      back_handle_st_cer(s);
    else if (scb->state == SC_ST_EST)
      back_establish(s);

    /* state is now one of SC_ST_CON (still in progress), SC_ST_EST
     * (established), SC_ST_DIS (abort), SC_ST_CLO (last error),
     * SC_ST_ASS/SC_ST_TAR/SC_ST_REQ for retryable errors.
     */
  }

  rq_prod_last = scf->state;
  rq_cons_last = scb->state;
  rp_cons_last = scf->state;
  rp_prod_last = scb->state;

  /* Check for connection closure */
  DBG_TRACE_POINT(STRM_EV_STRM_PROC, s);

  /* nothing special to be done on client side */
  if (unlikely(scf->state == SC_ST_DIS)) {
    scf->state = SC_ST_CLO;

    /* This is needed only when debugging is enabled, to indicate
     * client-side close.
     */
    if (unlikely((global.mode & MODE_DEBUG) &&
           (!(global.mode & MODE_QUIET) ||
            (global.mode & MODE_VERBOSE)))) {
      chunk_printf(&trash, "%08x:%s.clicls[%04x:%04x]\n",
             s->uniq_id, s->be->id,
             (unsigned short)conn_fd(sc_conn(scf)),
             (unsigned short)conn_fd(sc_conn(scb)));
      DISGUISE(write(1, trash.area, trash.data));
    }
  }

  /* When a server-side connection is released, we have to count it and
   * check for pending connections on this server.
   */
  if (unlikely(scb->state == SC_ST_DIS)) {
    scb->state = SC_ST_CLO;
    srv = objt_server(s->target);
    if (srv) {
      if (s->flags & SF_CURR_SESS) {
        s->flags &= ~SF_CURR_SESS;
        _HA_ATOMIC_DEC(&srv->cur_sess);
      }
      sess_change_server(s, NULL);
      if (may_dequeue_tasks(srv, s->be))
        process_srv_queue(srv);
    }

    /* This is needed only when debugging is enabled, to indicate
     * server-side close.
     */
    if (unlikely((global.mode & MODE_DEBUG) &&
           (!(global.mode & MODE_QUIET) ||
            (global.mode & MODE_VERBOSE)))) {
      if (s->prev_conn_state == SC_ST_EST) {
        chunk_printf(&trash, "%08x:%s.srvcls[%04x:%04x]\n",
               s->uniq_id, s->be->id,
               (unsigned short)conn_fd(sc_conn(scf)),
               (unsigned short)conn_fd(sc_conn(scb)));
        DISGUISE(write(1, trash.area, trash.data));
      }
    }
  }

  /*
   * Note: of the transient states (REQ, CER, DIS), only REQ may remain
   * at this point.
   */

 resync_request:
  /* Analyse request */
  if (((req->flags & ~rqf_last) & CF_MASK_ANALYSER) ||
      ((scf->flags ^ scf_flags) & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) ||
      ((scb->flags ^ scb_flags) & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) ||
      (req->analysers && (scb->flags & SC_FL_SHUT_DONE)) ||
      scf->state != rq_prod_last ||
      scb->state != rq_cons_last ||
      s->pending_events & TASK_WOKEN_MSG) {
    unsigned int scf_flags_ana = scf->flags;
    unsigned int scb_flags_ana = scb->flags;

    if (sc_state_in(scf->state, SC_SB_EST|SC_SB_DIS|SC_SB_CLO)) {
      int max_loops = global.tune.maxpollevents;
      unsigned int ana_list;
      unsigned int ana_back;

      /* it's up to the analysers to stop new connections,
       * disable reading or closing. Note: if an analyser
       * disables any of these bits, it is responsible for
       * enabling them again when it disables itself, so
       * that other analysers are called in similar conditions.
       */
      channel_auto_read(req);
      channel_auto_connect(req);
      channel_auto_close(req);

      /* We will call all analysers for which a bit is set in
       * req->analysers, following the bit order from LSB
       * to MSB. The analysers must remove themselves from
       * the list when not needed. Any analyser may return 0
       * to break out of the loop, either because of missing
       * data to take a decision, or because it decides to
       * kill the stream. We loop at least once through each
       * analyser, and we may loop again if other analysers
       * are added in the middle.
       *
       * We build a list of analysers to run. We evaluate all
       * of these analysers in the order of the lower bit to
       * the higher bit. This ordering is very important.
       * An analyser will often add/remove other analysers,
       * including itself. Any changes to itself have no effect
       * on the loop. If it removes any other analysers, we
       * want those analysers not to be called anymore during
       * this loop. If it adds an analyser that is located
       * after itself, we want it to be scheduled for being
       * processed during the loop. If it adds an analyser
       * which is located before it, we want it to switch to
       * it immediately, even if it has already been called
       * once but removed since.
       *
       * In order to achieve this, we compare the analyser
       * list after the call with a copy of it before the
       * call. The work list is fed with analyser bits that
       * appeared during the call. Then we compare previous
       * work list with the new one, and check the bits that
       * appeared. If the lowest of these bits is lower than
       * the current bit, it means we have enabled a previous
       * analyser and must immediately loop again.
       */

      ana_list = ana_back = req->analysers;
      while (ana_list && max_loops--) {
        /* Warning! ensure that analysers are always placed in ascending order! */
        ANALYZE    (s, req, flt_start_analyze,          ana_list, ana_back, AN_REQ_FLT_START_FE);
        FLT_ANALYZE(s, req, tcp_inspect_request,        ana_list, ana_back, AN_REQ_INSPECT_FE);
        FLT_ANALYZE(s, req, http_wait_for_request,      ana_list, ana_back, AN_REQ_WAIT_HTTP);
        FLT_ANALYZE(s, req, http_wait_for_request_body, ana_list, ana_back, AN_REQ_HTTP_BODY);
        FLT_ANALYZE(s, req, http_process_req_common,    ana_list, ana_back, AN_REQ_HTTP_PROCESS_FE, sess->fe);
        FLT_ANALYZE(s, req, process_switching_rules,    ana_list, ana_back, AN_REQ_SWITCHING_RULES);
        ANALYZE    (s, req, flt_start_analyze,          ana_list, ana_back, AN_REQ_FLT_START_BE);
        FLT_ANALYZE(s, req, tcp_inspect_request,        ana_list, ana_back, AN_REQ_INSPECT_BE);
        FLT_ANALYZE(s, req, http_process_req_common,    ana_list, ana_back, AN_REQ_HTTP_PROCESS_BE, s->be);
        FLT_ANALYZE(s, req, http_process_tarpit,        ana_list, ana_back, AN_REQ_HTTP_TARPIT);
        FLT_ANALYZE(s, req, process_server_rules,       ana_list, ana_back, AN_REQ_SRV_RULES);
        FLT_ANALYZE(s, req, http_process_request,       ana_list, ana_back, AN_REQ_HTTP_INNER);
        FLT_ANALYZE(s, req, tcp_persist_rdp_cookie,     ana_list, ana_back, AN_REQ_PRST_RDP_COOKIE);
        FLT_ANALYZE(s, req, process_sticking_rules,     ana_list, ana_back, AN_REQ_STICKING_RULES);
        ANALYZE    (s, req, flt_analyze_http_headers,   ana_list, ana_back, AN_REQ_FLT_HTTP_HDRS);
        ANALYZE    (s, req, http_request_forward_body,  ana_list, ana_back, AN_REQ_HTTP_XFER_BODY);
        ANALYZE    (s, req, pcli_wait_for_request,      ana_list, ana_back, AN_REQ_WAIT_CLI);
        ANALYZE    (s, req, flt_xfer_data,              ana_list, ana_back, AN_REQ_FLT_XFER_DATA);
        ANALYZE    (s, req, flt_end_analyze,            ana_list, ana_back, AN_REQ_FLT_END);
        break;
      }
    }

    rq_prod_last = scf->state;
    rq_cons_last = scb->state;
    req->flags &= ~CF_WAKE_ONCE;
    rqf_last = req->flags;
    scf_flags = (scf_flags & ~(SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) | (scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED));
    scb_flags = (scb_flags & ~(SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) | (scb->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED));

    if (((scf->flags ^ scf_flags_ana) & (SC_FL_EOS|SC_FL_ABRT_DONE)) || ((scb->flags ^ scb_flags_ana) & SC_FL_SHUT_DONE))
      goto resync_request;
  }

  /* we'll monitor the request analysers while parsing the response,
   * because some response analysers may indirectly enable new request
   * analysers (eg: HTTP keep-alive).
   */
  req_ana_back = req->analysers;

 resync_response:
  /* Analyse response */

  if (((res->flags & ~rpf_last) & CF_MASK_ANALYSER) ||
      ((scb->flags ^ scb_flags) & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) ||
      ((scf->flags ^ scf_flags) & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) ||
      (res->analysers && (scf->flags & SC_FL_SHUT_DONE)) ||
      scf->state != rp_cons_last ||
      scb->state != rp_prod_last ||
      s->pending_events & TASK_WOKEN_MSG) {
    unsigned int scb_flags_ana = scb->flags;
    unsigned int scf_flags_ana = scf->flags;

    if (sc_state_in(scb->state, SC_SB_EST|SC_SB_DIS|SC_SB_CLO)) {
      int max_loops = global.tune.maxpollevents;
      unsigned int ana_list;
      unsigned int ana_back;

      /* it's up to the analysers to stop disable reading or
       * closing. Note: if an analyser disables any of these
       * bits, it is responsible for enabling them again when
       * it disables itself, so that other analysers are called
       * in similar conditions.
       */
      channel_auto_read(res);
      channel_auto_close(res);

      /* We will call all analysers for which a bit is set in
       * res->analysers, following the bit order from LSB
       * to MSB. The analysers must remove themselves from
       * the list when not needed. Any analyser may return 0
       * to break out of the loop, either because of missing
       * data to take a decision, or because it decides to
       * kill the stream. We loop at least once through each
       * analyser, and we may loop again if other analysers
       * are added in the middle.
       */

      ana_list = ana_back = res->analysers;
      while (ana_list && max_loops--) {
        /* Warning! ensure that analysers are always placed in ascending order! */
        ANALYZE    (s, res, flt_start_analyze,          ana_list, ana_back, AN_RES_FLT_START_FE);
        ANALYZE    (s, res, flt_start_analyze,          ana_list, ana_back, AN_RES_FLT_START_BE);
        FLT_ANALYZE(s, res, tcp_inspect_response,       ana_list, ana_back, AN_RES_INSPECT);
        FLT_ANALYZE(s, res, http_wait_for_response,     ana_list, ana_back, AN_RES_WAIT_HTTP);
        FLT_ANALYZE(s, res, process_store_rules,        ana_list, ana_back, AN_RES_STORE_RULES);
        FLT_ANALYZE(s, res, http_process_res_common,    ana_list, ana_back, AN_RES_HTTP_PROCESS_BE, s->be);
        ANALYZE    (s, res, flt_analyze_http_headers,   ana_list, ana_back, AN_RES_FLT_HTTP_HDRS);
        ANALYZE    (s, res, http_response_forward_body, ana_list, ana_back, AN_RES_HTTP_XFER_BODY);
        ANALYZE    (s, res, pcli_wait_for_response,     ana_list, ana_back, AN_RES_WAIT_CLI);
        ANALYZE    (s, res, flt_xfer_data,              ana_list, ana_back, AN_RES_FLT_XFER_DATA);
        ANALYZE    (s, res, flt_end_analyze,            ana_list, ana_back, AN_RES_FLT_END);
        break;
      }
    }

    rp_cons_last = scf->state;
    rp_prod_last = scb->state;
    res->flags &= ~CF_WAKE_ONCE;
    rpf_last = res->flags;
    scb_flags = (scb_flags & ~(SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) | (scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED));
    scf_flags = (scf_flags & ~(SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) | (scf->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED));

    if (((scb->flags ^ scb_flags_ana) & (SC_FL_EOS|SC_FL_ABRT_DONE)) || ((scf->flags ^ scf_flags_ana) & SC_FL_SHUT_DONE))
      goto resync_response;
  }

  /* we'll monitor the response analysers because some response analysers
   * may be enabled/disabled later
   */
  res_ana_back = res->analysers;

  /* maybe someone has added some request analysers, so we must check and loop */
  if (req->analysers & ~req_ana_back)
    goto resync_request;

  if ((req->flags & ~rqf_last) & CF_MASK_ANALYSER)
    goto resync_request;

  /* FIXME: here we should call protocol handlers which rely on
   * both buffers.
   */


  /*
   * Now we propagate unhandled errors to the stream. Normally
   * we're just in a data phase here since it means we have not
   * seen any analyser who could set an error status.
   */
  srv = objt_server(s->target);
  if (unlikely(!(s->flags & SF_ERR_MASK))) {
    if ((scf->flags & SC_FL_ERROR) || req->flags & (CF_READ_TIMEOUT|CF_WRITE_TIMEOUT)) {
      /* Report it if the client got an error or a read timeout expired */
      req->analysers &= AN_REQ_FLT_END;
      channel_auto_close(req);
      if (scf->flags & SC_FL_ERROR) {
        _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.cli_aborts);
        s->flags |= SF_ERR_CLICL;
      }
      else if (req->flags & CF_READ_TIMEOUT) {
        _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.cli_aborts);
        s->flags |= SF_ERR_CLITO;
      }
      else {
        _HA_ATOMIC_INC(&s->be->be_counters.srv_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.srv_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->srv_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.srv_aborts);
        s->flags |= SF_ERR_SRVTO;
      }
      sess_set_term_flags(s);

      /* Abort the request if a client error occurred while
       * the backend stream connector is in the SC_ST_INI
       * state. It is switched into the SC_ST_CLO state and
       * the request channel is erased. */
      if (scb->state == SC_ST_INI) {
        s->scb->state = SC_ST_CLO;
        channel_abort(req);
        if (IS_HTX_STRM(s))
          channel_htx_erase(req, htxbuf(&req->buf));
        else
          channel_erase(req);
      }
    }
    else if ((scb->flags & SC_FL_ERROR) || res->flags & (CF_READ_TIMEOUT|CF_WRITE_TIMEOUT)) {
      /* Report it if the server got an error or a read timeout expired */
      res->analysers &= AN_RES_FLT_END;
      channel_auto_close(res);
      if (scb->flags & SC_FL_ERROR) {
        _HA_ATOMIC_INC(&s->be->be_counters.srv_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.srv_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->srv_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.srv_aborts);
        s->flags |= SF_ERR_SRVCL;
      }
      else if (res->flags & CF_READ_TIMEOUT) {
        _HA_ATOMIC_INC(&s->be->be_counters.srv_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.srv_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->srv_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.srv_aborts);
        s->flags |= SF_ERR_SRVTO;
      }
      else {
        _HA_ATOMIC_INC(&s->be->be_counters.cli_aborts);
        _HA_ATOMIC_INC(&sess->fe->fe_counters.cli_aborts);
        if (sess->listener && sess->listener->counters)
          _HA_ATOMIC_INC(&sess->listener->counters->cli_aborts);
        if (srv)
          _HA_ATOMIC_INC(&srv->counters.cli_aborts);
        s->flags |= SF_ERR_CLITO;
      }
      sess_set_term_flags(s);
    }
  }

  /*
   * Here we take care of forwarding unhandled data. This also includes
   * connection establishments and shutdown requests.
   */


  /* If no one is interested in analysing data, it's time to forward
   * everything. We configure the buffer to forward indefinitely.
   * Note that we're checking SC_FL_ABRT_WANTED as an indication of a possible
   * recent call to channel_abort().
   */
  if (unlikely((!req->analysers || (req->analysers == AN_REQ_FLT_END && !(req->flags & CF_FLT_ANALYZE))) &&
         !(scf->flags & SC_FL_ABRT_WANTED) && !(scb->flags & SC_FL_SHUT_DONE) &&
         (sc_state_in(scf->state, SC_SB_EST|SC_SB_DIS|SC_SB_CLO)) &&
         (req->to_forward != CHN_INFINITE_FORWARD))) {
    /* This buffer is freewheeling, there's no analyser
     * attached to it. If any data are left in, we'll permit them to
     * move.
     */
    channel_auto_read(req);
    channel_auto_connect(req);
    channel_auto_close(req);

    if (IS_HTX_STRM(s)) {
      struct htx *htx = htxbuf(&req->buf);

      /* We'll let data flow between the producer (if still connected)
       * to the consumer.
       */
      co_set_data(req, htx->data);
      if ((global.tune.options & GTUNE_USE_FAST_FWD) &&
          !(scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) && !(scb->flags & SC_FL_SHUT_WANTED))
        channel_htx_forward_forever(req, htx);
    }
    else {
      /* We'll let data flow between the producer (if still connected)
       * to the consumer (which might possibly not be connected yet).
       */
      c_adv(req, ci_data(req));
      if ((global.tune.options & GTUNE_USE_FAST_FWD) &&
          !(scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) && !(scb->flags & SC_FL_SHUT_WANTED))
        channel_forward_forever(req);
    }
  }

  /* reflect what the L7 analysers have seen last */
  rqf_last = req->flags;
  scf_flags = (scf_flags & ~(SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) | (scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED));
  scb_flags = (scb_flags & ~(SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) | (scb->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED));

  /* it's possible that an upper layer has requested a connection setup or abort.
   * There are 2 situations where we decide to establish a new connection :
   *  - there are data scheduled for emission in the buffer
   *  - the CF_AUTO_CONNECT flag is set (active connection)
   */
  if (scb->state == SC_ST_INI) {
    if (!(scb->flags & SC_FL_SHUT_DONE)) {
      if ((req->flags & CF_AUTO_CONNECT) || co_data(req)) {
        /* If we have an appctx, there is no connect method, so we
         * immediately switch to the connected state, otherwise we
         * perform a connection request.
         */
        scb->state = SC_ST_REQ; /* new connection requested */
        s->conn_retries = 0;
        if ((s->be->retry_type &~ PR_RE_CONN_FAILED) &&
            (s->be->mode == PR_MODE_HTTP) &&
            !(s->txn->flags & TX_D_L7_RETRY))
          s->txn->flags |= TX_L7_RETRY;

        if (s->be->options & PR_O_ABRT_CLOSE) {
          struct connection *conn = sc_conn(scf);

          if (conn && conn->mux && conn->mux->ctl)
            conn->mux->ctl(conn, MUX_SUBS_RECV, NULL);
        }
      }
    }
    else {
      s->scb->state = SC_ST_CLO; /* shutw+ini = abort */
      sc_schedule_shutdown(scb);
      sc_schedule_abort(scb);
    }
  }


  /* we may have a pending connection request, or a connection waiting
   * for completion.
   */
  if (sc_state_in(scb->state, SC_SB_REQ|SC_SB_QUE|SC_SB_TAR|SC_SB_ASS)) {
    /* prune the request variables and swap to the response variables. */
    if (s->vars_reqres.scope != SCOPE_RES) {
      if (!LIST_ISEMPTY(&s->vars_reqres.head))
        vars_prune(&s->vars_reqres, s->sess, s);
      vars_init_head(&s->vars_reqres, SCOPE_RES);
    }

    do {
      /* nb: step 1 might switch from QUE to ASS, but we first want
       * to give a chance to step 2 to perform a redirect if needed.
       */
      if (scb->state != SC_ST_REQ)
        back_try_conn_req(s);
      if (scb->state == SC_ST_REQ)
        back_handle_st_req(s);

      /* get a chance to complete an immediate connection setup */
      if (scb->state == SC_ST_RDY)
        goto resync_stconns;

      /* applets directly go to the ESTABLISHED state. Similarly,
       * servers experience the same fate when their connection
       * is reused.
       */
      if (unlikely(scb->state == SC_ST_EST))
        back_establish(s);

      srv = objt_server(s->target);
      if (scb->state == SC_ST_ASS && srv && srv->rdr_len && (s->flags & SF_REDIRECTABLE))
        http_perform_server_redirect(s, scb);
    } while (scb->state == SC_ST_ASS);
  }

  /* Let's see if we can send the pending request now */
  sc_conn_sync_send(scb);

  /*
   * Now forward all shutdown requests between both sides of the request buffer
   */

  /* first, let's check if the request buffer needs to shutdown(write), which may
   * happen either because the input is closed or because we want to force a close
   * once the server has begun to respond. If a half-closed timeout is set, we adjust
   * the other side's timeout as well. However this doesn't have effect during the
   * connection setup unless the backend has abortonclose set.
   */
  if (unlikely((req->flags & CF_AUTO_CLOSE) && (scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) &&
         !(scb->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) &&
         (scb->state != SC_ST_CON || (s->be->options & PR_O_ABRT_CLOSE)))) {
    sc_schedule_shutdown(scb);
  }

  /* shutdown(write) pending */
  if (unlikely((scb->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) == SC_FL_SHUT_WANTED &&
         (!co_data(req) || (req->flags & CF_WRITE_TIMEOUT)))) {
    if (scf->flags & SC_FL_ERROR)
      scb->flags |= SC_FL_NOLINGER;
    sc_shutdown(scb);
  }

  /* shutdown(write) done on server side, we must stop the client too */
  if (unlikely((scb->flags & SC_FL_SHUT_DONE) && !(scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED))) &&
      !req->analysers)
    sc_schedule_abort(scf);

  /* shutdown(read) pending */
  if (unlikely((scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) == SC_FL_ABRT_WANTED)) {
    if (scf->flags & SC_FL_NOHALF)
      scf->flags |= SC_FL_NOLINGER;
    sc_abort(scf);
  }

  /* Benchmarks have shown that it's optimal to do a full resync now */
  if (scf->state == SC_ST_DIS ||
      sc_state_in(scb->state, SC_SB_RDY|SC_SB_DIS) ||
      ((scf->flags & SC_FL_ERROR) && scf->state != SC_ST_CLO) ||
      ((scb->flags & SC_FL_ERROR) && scb->state != SC_ST_CLO))
    goto resync_stconns;

  /* otherwise we want to check if we need to resync the req buffer or not */
  if (((scf->flags ^ scf_flags) & (SC_FL_EOS|SC_FL_ABRT_DONE)) || ((scb->flags ^ scb_flags) & SC_FL_SHUT_DONE))
    goto resync_request;

  /* perform output updates to the response buffer */

  /* If no one is interested in analysing data, it's time to forward
   * everything. We configure the buffer to forward indefinitely.
   * Note that we're checking SC_FL_ABRT_WANTED as an indication of a possible
   * recent call to channel_abort().
   */
  if (unlikely((!res->analysers || (res->analysers == AN_RES_FLT_END && !(res->flags & CF_FLT_ANALYZE))) &&
         !(scf->flags & SC_FL_ABRT_WANTED) && !(scb->flags & SC_FL_SHUT_WANTED) &&
         sc_state_in(scb->state, SC_SB_EST|SC_SB_DIS|SC_SB_CLO) &&
         (res->to_forward != CHN_INFINITE_FORWARD))) {
    /* This buffer is freewheeling, there's no analyser
     * attached to it. If any data are left in, we'll permit them to
     * move.
     */
    channel_auto_read(res);
    channel_auto_close(res);

    if (IS_HTX_STRM(s)) {
      struct htx *htx = htxbuf(&res->buf);

      /* We'll let data flow between the producer (if still connected)
       * to the consumer.
       */
      co_set_data(res, htx->data);
      if ((global.tune.options & GTUNE_USE_FAST_FWD) &&
          !(scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) && !(scb->flags & SC_FL_SHUT_WANTED))
        channel_htx_forward_forever(res, htx);
    }
    else {
      /* We'll let data flow between the producer (if still connected)
       * to the consumer.
       */
      c_adv(res, ci_data(res));
      if ((global.tune.options & GTUNE_USE_FAST_FWD) &&
          !(scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) && !(scb->flags & SC_FL_SHUT_WANTED))
        channel_forward_forever(res);
    }

    /* if we have no analyser anymore in any direction and have a
     * tunnel timeout set, use it now. Note that we must respect
     * the half-closed timeouts as well.
     */
    if (!req->analysers && s->tunnel_timeout) {
      scf->ioto = scb->ioto = s->tunnel_timeout;

      if (!IS_HTX_STRM(s)) {
        if ((scf->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_SHUT_DONE)) && tick_isset(sess->fe->timeout.clientfin))
          scf->ioto = sess->fe->timeout.clientfin;
        if ((scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_SHUT_DONE)) && tick_isset(s->be->timeout.serverfin))
          scb->ioto = s->be->timeout.serverfin;
      }
    }
  }

  /* reflect what the L7 analysers have seen last */
  rpf_last = res->flags;
  scb_flags = (scb_flags & ~(SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) | (scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED));
  scf_flags = (scf_flags & ~(SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) | (scf->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED));

  /* Let's see if we can send the pending response now */
  sc_conn_sync_send(scf);

  /*
   * Now forward all shutdown requests between both sides of the buffer
   */

  /*
   * FIXME: this is probably where we should produce error responses.
   */

  /* first, let's check if the response buffer needs to shutdown(write) */
  if (unlikely((res->flags & CF_AUTO_CLOSE) && (scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE)) &&
         !(scf->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)))) {
    sc_schedule_shutdown(scf);
  }

  /* shutdown(write) pending */
  if (unlikely((scf->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) == SC_FL_SHUT_WANTED &&
         (!co_data(res) || (res->flags & CF_WRITE_TIMEOUT)))) {
    sc_shutdown(scf);
  }

  /* shutdown(write) done on the client side, we must stop the server too */
  if (unlikely((scf->flags & SC_FL_SHUT_DONE) && !(scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED))) &&
      !res->analysers)
    sc_schedule_abort(scb);

  /* shutdown(read) pending */
  if (unlikely((scb->flags & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) == SC_FL_ABRT_WANTED)) {
    if (scb->flags & SC_FL_NOHALF)
      scb->flags |= SC_FL_NOLINGER;
    sc_abort(scb);
  }

  if (scf->state == SC_ST_DIS ||
      sc_state_in(scb->state, SC_SB_RDY|SC_SB_DIS) ||
      ((scf->flags & SC_FL_ERROR) && scf->state != SC_ST_CLO) ||
      ((scb->flags & SC_FL_ERROR) && scb->state != SC_ST_CLO))
    goto resync_stconns;

  if ((req->flags & ~rqf_last) & CF_MASK_ANALYSER)
    goto resync_request;

  if (((scb->flags ^ scb_flags) & (SC_FL_EOS|SC_FL_ABRT_DONE|SC_FL_ABRT_WANTED)) ||
      ((scf->flags ^ scf_flags) & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED)) ||
      (res->analysers ^ res_ana_back))
    goto resync_response;

  if ((((req->flags ^ rqf_last) | (res->flags ^ rpf_last)) & CF_MASK_ANALYSER) ||
      (req->analysers ^ req_ana_back))
    goto resync_request;

  /* we're interested in getting wakeups again */
  scf->flags &= ~SC_FL_DONT_WAKE;
  scb->flags &= ~SC_FL_DONT_WAKE;

  if (likely((scf->state != SC_ST_CLO) || !sc_state_in(scb->state, SC_SB_INI|SC_SB_CLO) ||
       (req->analysers & AN_REQ_FLT_END) || (res->analysers & AN_RES_FLT_END))) {
    if ((sess->fe->options & PR_O_CONTSTATS) && (s->flags & SF_BE_ASSIGNED) && !(s->flags & SF_IGNORE))
      stream_process_counters(s);

    stream_update_both_sc(s);

    /* Reset pending events now */
    s->pending_events = 0;

  update_exp_and_leave:
    /* Note: please ensure that if you branch here you disable SC_FL_DONT_WAKE */
    if (!req->analysers)
      req->analyse_exp = TICK_ETERNITY;
    if (!res->analysers)
      res->analyse_exp = TICK_ETERNITY;

    if ((sess->fe->options & PR_O_CONTSTATS) && (s->flags & SF_BE_ASSIGNED) &&
              (!tick_isset(req->analyse_exp) || tick_is_expired(req->analyse_exp, now_ms)))
      req->analyse_exp = tick_add(now_ms, 5000);

    t->expire = (tick_is_expired(t->expire, now_ms) ? 0 : t->expire);
    t->expire = tick_first(t->expire, sc_ep_rcv_ex(scf));
    t->expire = tick_first(t->expire, sc_ep_snd_ex(scf));
    t->expire = tick_first(t->expire, sc_ep_rcv_ex(scb));
    t->expire = tick_first(t->expire, sc_ep_snd_ex(scb));
    t->expire = tick_first(t->expire, req->analyse_exp);
    t->expire = tick_first(t->expire, res->analyse_exp);
    t->expire = tick_first(t->expire, s->conn_exp);

    if (unlikely(tick_is_expired(t->expire, now_ms))) {
      /* Some events prevented the timeouts to be handled but nothing evolved.
         So do it now and resyunc the stconns
       */
      stream_handle_timeouts(s);
      goto resync_stconns;
    }

    s->pending_events &= ~(TASK_WOKEN_TIMER | TASK_WOKEN_RES);
    stream_release_buffers(s);

    DBG_TRACE_DEVEL("queuing", STRM_EV_STRM_PROC, s);
    return t; /* nothing more to do */
  }

  DBG_TRACE_DEVEL("releasing", STRM_EV_STRM_PROC, s);

  if (s->flags & SF_BE_ASSIGNED)
    _HA_ATOMIC_DEC(&s->be->beconn);

  if (unlikely((global.mode & MODE_DEBUG) &&
         (!(global.mode & MODE_QUIET) || (global.mode & MODE_VERBOSE)))) {
    chunk_printf(&trash, "%08x:%s.closed[%04x:%04x]\n",
           s->uniq_id, s->be->id,
           (unsigned short)conn_fd(sc_conn(scf)),
           (unsigned short)conn_fd(sc_conn(scb)));
    DISGUISE(write(1, trash.area, trash.data));
  }

  if (!(s->flags & SF_IGNORE)) {
    s->logs.t_close = ns_to_ms(now_ns - s->logs.accept_ts);

    stream_process_counters(s);

    if (s->txn && s->txn->status) {
      int n;

      n = s->txn->status / 100;
      if (n < 1 || n > 5)
        n = 0;

      if (sess->fe->mode == PR_MODE_HTTP) {
        _HA_ATOMIC_INC(&sess->fe->fe_counters.p.http.rsp[n]);
      }
      if ((s->flags & SF_BE_ASSIGNED) &&
          (s->be->mode == PR_MODE_HTTP)) {
        _HA_ATOMIC_INC(&s->be->be_counters.p.http.rsp[n]);
        _HA_ATOMIC_INC(&s->be->be_counters.p.http.cum_req);
      }
    }

    /* let's do a final log if we need it */
    if (!LIST_ISEMPTY(&sess->fe->logformat) && s->logs.logwait &&
        !(s->flags & SF_MONITOR) &&
        (!(sess->fe->options & PR_O_NULLNOLOG) || req->total)) {
      /* we may need to know the position in the queue */
      pendconn_free(s);

      stream_cond_update_cpu_usage(s);
      s->do_log(s);
    }

    /* update time stats for this stream */
    stream_update_time_stats(s);
  }

  /* the task MUST not be in the run queue anymore */
  stream_free(s);
  task_destroy(t);
  return NULL;
}

/* Update the stream's backend and server time stats */
void stream_update_time_stats(struct stream *s)
{
  int t_request;
  int t_queue;
  int t_connect;
  int t_data;
  int t_close;
  struct server *srv;
  unsigned int samples_window;

  t_request = 0;
  t_queue   = s->logs.t_queue;
  t_connect = s->logs.t_connect;
  t_close   = s->logs.t_close;
  t_data    = s->logs.t_data;

  if (s->be->mode != PR_MODE_HTTP)
    t_data = t_connect;

  if (t_connect < 0 || t_data < 0)
    return;

  if ((llong)(s->logs.request_ts - s->logs.accept_ts) >= 0)
    t_request = ns_to_ms(s->logs.request_ts - s->logs.accept_ts);

  t_data    -= t_connect;
  t_connect -= t_queue;
  t_queue   -= t_request;

  srv = objt_server(s->target);
  if (srv) {
    samples_window = (((s->be->mode == PR_MODE_HTTP) ?
      srv->counters.p.http.cum_req : srv->counters.cum_lbconn) > TIME_STATS_SAMPLES) ? TIME_STATS_SAMPLES : 0;
    swrate_add_dynamic(&srv->counters.q_time, samples_window, t_queue);
    swrate_add_dynamic(&srv->counters.c_time, samples_window, t_connect);
    swrate_add_dynamic(&srv->counters.d_time, samples_window, t_data);
    swrate_add_dynamic(&srv->counters.t_time, samples_window, t_close);
    HA_ATOMIC_UPDATE_MAX(&srv->counters.qtime_max, t_queue);
    HA_ATOMIC_UPDATE_MAX(&srv->counters.ctime_max, t_connect);
    HA_ATOMIC_UPDATE_MAX(&srv->counters.dtime_max, t_data);
    HA_ATOMIC_UPDATE_MAX(&srv->counters.ttime_max, t_close);
  }
  samples_window = (((s->be->mode == PR_MODE_HTTP) ?
    s->be->be_counters.p.http.cum_req : s->be->be_counters.cum_lbconn) > TIME_STATS_SAMPLES) ? TIME_STATS_SAMPLES : 0;
  swrate_add_dynamic(&s->be->be_counters.q_time, samples_window, t_queue);
  swrate_add_dynamic(&s->be->be_counters.c_time, samples_window, t_connect);
  swrate_add_dynamic(&s->be->be_counters.d_time, samples_window, t_data);
  swrate_add_dynamic(&s->be->be_counters.t_time, samples_window, t_close);
  HA_ATOMIC_UPDATE_MAX(&s->be->be_counters.qtime_max, t_queue);
  HA_ATOMIC_UPDATE_MAX(&s->be->be_counters.ctime_max, t_connect);
  HA_ATOMIC_UPDATE_MAX(&s->be->be_counters.dtime_max, t_data);
  HA_ATOMIC_UPDATE_MAX(&s->be->be_counters.ttime_max, t_close);
}

/*
 * This function adjusts sess->srv_conn and maintains the previous and new
 * server's served stream counts. Setting newsrv to NULL is enough to release
 * current connection slot. This function also notifies any LB algo which might
 * expect to be informed about any change in the number of active streams on a
 * server.
 */
void sess_change_server(struct stream *strm, struct server *newsrv)
{
  struct server *oldsrv = strm->srv_conn;

  if (oldsrv == newsrv)
    return;

  if (oldsrv) {
    _HA_ATOMIC_DEC(&oldsrv->served);
    _HA_ATOMIC_DEC(&oldsrv->proxy->served);
    __ha_barrier_atomic_store();
    if (oldsrv->proxy->lbprm.server_drop_conn)
      oldsrv->proxy->lbprm.server_drop_conn(oldsrv);
    stream_del_srv_conn(strm);
  }

  if (newsrv) {
    _HA_ATOMIC_INC(&newsrv->served);
    _HA_ATOMIC_INC(&newsrv->proxy->served);
    __ha_barrier_atomic_store();
    if (newsrv->proxy->lbprm.server_take_conn)
      newsrv->proxy->lbprm.server_take_conn(newsrv);
    stream_add_srv_conn(strm, newsrv);
  }
}

/* Handle server-side errors for default protocols. It is called whenever a a
 * connection setup is aborted or a request is aborted in queue. It sets the
 * stream termination flags so that the caller does not have to worry about
 * them. It's installed as ->srv_error for the server-side stream connector.
 */
void default_srv_error(struct stream *s, struct stconn *sc)
{
  int err_type = s->conn_err_type;
  int err = 0, fin = 0;

  if (err_type & STRM_ET_QUEUE_ABRT) {
    err = SF_ERR_CLICL;
    fin = SF_FINST_Q;
  }
  else if (err_type & STRM_ET_CONN_ABRT) {
    err = SF_ERR_CLICL;
    fin = SF_FINST_C;
  }
  else if (err_type & STRM_ET_QUEUE_TO) {
    err = SF_ERR_SRVTO;
    fin = SF_FINST_Q;
  }
  else if (err_type & STRM_ET_QUEUE_ERR) {
    err = SF_ERR_SRVCL;
    fin = SF_FINST_Q;
  }
  else if (err_type & STRM_ET_CONN_TO) {
    err = SF_ERR_SRVTO;
    fin = SF_FINST_C;
  }
  else if (err_type & STRM_ET_CONN_ERR) {
    err = SF_ERR_SRVCL;
    fin = SF_FINST_C;
  }
  else if (err_type & STRM_ET_CONN_RES) {
    err = SF_ERR_RESOURCE;
    fin = SF_FINST_C;
  }
  else /* STRM_ET_CONN_OTHER and others */ {
    err = SF_ERR_INTERNAL;
    fin = SF_FINST_C;
  }

  if (!(s->flags & SF_ERR_MASK))
    s->flags |= err;
  if (!(s->flags & SF_FINST_MASK))
    s->flags |= fin;
}

/* kill a stream and set the termination flags to <why> (one of SF_ERR_*) */
void stream_shutdown(struct stream *stream, int why)
{
  if (stream->scb->flags & (SC_FL_SHUT_DONE|SC_FL_SHUT_WANTED))
    return;

  sc_schedule_shutdown(stream->scb);
  sc_schedule_abort(stream->scb);
  stream->task->nice = 1024;
  if (!(stream->flags & SF_ERR_MASK))
    stream->flags |= why;
  task_wakeup(stream->task, TASK_WOKEN_OTHER);
}

/* dumps an error message for type <type> at ptr <ptr> related to stream <s>,
 * having reached loop rate <rate>, then aborts hoping to retrieve a core.
 */
void stream_dump_and_crash(enum obj_type *obj, int rate)
{
  struct stream *s;
  char *msg = NULL;
  const void *ptr;

  ptr = s = objt_stream(obj);
  if (!s) {
    const struct appctx *appctx = objt_appctx(obj);
    if (!appctx)
      return;
    ptr = appctx;
    s = appctx_strm(appctx);
    if (!s)
      return;
  }

  chunk_reset(&trash);
  chunk_printf(&trash, "  ");
  strm_dump_to_buffer(&trash, s, " ", HA_ATOMIC_LOAD(&global.anon_key));

  if (ptr != s) { // that's an appctx
    const struct appctx *appctx = ptr;

    chunk_appendf(&trash, " applet=%p(", appctx->applet);
    resolve_sym_name(&trash, NULL, appctx->applet);
    chunk_appendf(&trash, ")");

    chunk_appendf(&trash, " handler=%p(", appctx->applet->fct);
    resolve_sym_name(&trash, NULL, appctx->applet->fct);
    chunk_appendf(&trash, ")");
  }

  memprintf(&msg,
            "A bogus %s [%p] is spinning at %d calls per second and refuses to die, "
            "aborting now! Please report this error to developers:\n"
            "%s\n",
            obj_type_name(obj), ptr, rate, trash.area);

  ha_alert("%s", msg);
  send_log(NULL, LOG_EMERG, "%s", msg);
  ABORT_NOW();
}

/* initialize the require structures */
static void init_stream()
{
  int thr;

  for (thr = 0; thr < MAX_THREADS; thr++)
    LIST_INIT(&ha_thread_ctx[thr].streams);
}
INITCALL0(STG_INIT, init_stream);

/* Generates a unique ID based on the given <format>, stores it in the given <strm> and
 * returns the unique ID.
 *
 * If this function fails to allocate memory IST_NULL is returned.
 *
 * If an ID is already stored within the stream nothing happens existing unique ID is
 * returned.
 */
struct ist stream_generate_unique_id(struct stream *strm, struct list *format)
{
  if (isttest(strm->unique_id)) {
    return strm->unique_id;
  }
  else {
    char *unique_id;
    int length;
    if ((unique_id = pool_alloc(pool_head_uniqueid)) == NULL)
      return IST_NULL;

    length = build_logline(strm, unique_id, UNIQUEID_LEN, format);
    strm->unique_id = ist2(unique_id, length);

    return strm->unique_id;
  }
}

/************************************************************************/
/*           All supported ACL keywords must be declared here.          */
/************************************************************************/
static enum act_return stream_action_set_log_level(struct act_rule *rule, struct proxy *px,
               struct session *sess, struct stream *s, int flags)
{
  s->logs.level = (uintptr_t)rule->arg.act.p[0];
  return ACT_RET_CONT;
}


/* Parse a "set-log-level" action. It takes the level value as argument. It
 * returns ACT_RET_PRS_OK on success, ACT_RET_PRS_ERR on error.
 */
static enum act_parse_ret stream_parse_set_log_level(const char **args, int *cur_arg, struct proxy *px,
                 struct act_rule *rule, char **err)
{
  int level;

  if (!*args[*cur_arg]) {
    bad_log_level:
    memprintf(err, "expects exactly 1 argument (log level name or 'silent')");
    return ACT_RET_PRS_ERR;
  }
  if (strcmp(args[*cur_arg], "silent") == 0)
    level = -1;
  else if ((level = get_log_level(args[*cur_arg]) + 1) == 0)
    goto bad_log_level;

  (*cur_arg)++;

  /* Register processing function. */
  rule->action_ptr = stream_action_set_log_level;
  rule->action = ACT_CUSTOM;
  rule->arg.act.p[0] = (void *)(uintptr_t)level;
  return ACT_RET_PRS_OK;
}

static enum act_return stream_action_set_nice(struct act_rule *rule, struct proxy *px,
                struct session *sess, struct stream *s, int flags)
{
  s->task->nice = (uintptr_t)rule->arg.act.p[0];
  return ACT_RET_CONT;
}


/* Parse a "set-nice" action. It takes the nice value as argument. It returns
 * ACT_RET_PRS_OK on success, ACT_RET_PRS_ERR on error.
 */
static enum act_parse_ret stream_parse_set_nice(const char **args, int *cur_arg, struct proxy *px,
            struct act_rule *rule, char **err)
{
  int nice;

  if (!*args[*cur_arg]) {
    bad_log_level:
    memprintf(err, "expects exactly 1 argument (integer value)");
    return ACT_RET_PRS_ERR;
  }

  nice = atoi(args[*cur_arg]);
  if (nice < -1024)
    nice = -1024;
  else if (nice > 1024)
    nice = 1024;

  (*cur_arg)++;

  /* Register processing function. */
  rule->action_ptr = stream_action_set_nice;
  rule->action = ACT_CUSTOM;
  rule->arg.act.p[0] = (void *)(uintptr_t)nice;
  return ACT_RET_PRS_OK;
}


static enum act_return tcp_action_switch_stream_mode(struct act_rule *rule, struct proxy *px,
              struct session *sess, struct stream *s, int flags)
{
  enum pr_mode mode = (uintptr_t)rule->arg.act.p[0];
  const struct mux_proto_list *mux_proto = rule->arg.act.p[1];

  if (!IS_HTX_STRM(s) && mode == PR_MODE_HTTP) {
    if (!stream_set_http_mode(s, mux_proto)) {
      stream_abort(s);
      return ACT_RET_ABRT;
    }
  }
  return ACT_RET_STOP;
}


static int check_tcp_switch_stream_mode(struct act_rule *rule, struct proxy *px, char **err)
{
  const struct mux_proto_list *mux_ent;
  const struct mux_proto_list *mux_proto = rule->arg.act.p[1];
  enum pr_mode pr_mode = (uintptr_t)rule->arg.act.p[0];
  enum proto_proxy_mode mode = conn_pr_mode_to_proto_mode(pr_mode);

  if (pr_mode == PR_MODE_HTTP)
    px->options |= PR_O_HTTP_UPG;

  if (mux_proto) {
    mux_ent = conn_get_best_mux_entry(mux_proto->token, PROTO_SIDE_FE, mode);
    if (!mux_ent || !isteq(mux_ent->token, mux_proto->token)) {
      memprintf(err, "MUX protocol '%.*s' is not compatible with the selected mode",
          (int)mux_proto->token.len, mux_proto->token.ptr);
      return 0;
    }
  }
  else {
    mux_ent = conn_get_best_mux_entry(IST_NULL, PROTO_SIDE_FE, mode);
    if (!mux_ent) {
      memprintf(err, "Unable to find compatible MUX protocol with the selected mode");
      return 0;
    }
  }

  /* Update the mux */
  rule->arg.act.p[1] = (void *)mux_ent;
  return 1;

}

static enum act_parse_ret stream_parse_switch_mode(const char **args, int *cur_arg,
               struct proxy *px, struct act_rule *rule,
               char **err)
{
  const struct mux_proto_list *mux_proto = NULL;
  struct ist proto;
  enum pr_mode mode;

  /* must have at least the mode */
  if (*(args[*cur_arg]) == 0) {
    memprintf(err, "'%s %s' expects a mode as argument.", args[0], args[*cur_arg-1]);
    return ACT_RET_PRS_ERR;
  }

  if (!(px->cap & PR_CAP_FE)) {
    memprintf(err, "'%s %s' not allowed because %s '%s' has no frontend capability",
        args[0], args[*cur_arg-1], proxy_type_str(px), px->id);
    return ACT_RET_PRS_ERR;
  }
  /* Check if the mode. For now "tcp" is disabled because downgrade is not
   * supported and PT is the only TCP mux.
   */
  if (strcmp(args[*cur_arg], "http") == 0)
    mode = PR_MODE_HTTP;
  else {
    memprintf(err, "'%s %s' expects a valid mode (got '%s').", args[0], args[*cur_arg-1], args[*cur_arg]);
    return ACT_RET_PRS_ERR;
  }

  /* check the proto, if specified */
  if (*(args[*cur_arg+1]) && strcmp(args[*cur_arg+1], "proto") == 0) {
    if (*(args[*cur_arg+2]) == 0) {
      memprintf(err, "'%s %s': '%s' expects a protocol as argument.",
          args[0], args[*cur_arg-1], args[*cur_arg+1]);
      return ACT_RET_PRS_ERR;
    }

    proto = ist(args[*cur_arg + 2]);
    mux_proto = get_mux_proto(proto);
    if (!mux_proto) {
      memprintf(err, "'%s %s': '%s' expects a valid MUX protocol, if specified (got '%s')",
          args[0], args[*cur_arg-1], args[*cur_arg+1], args[*cur_arg+2]);
      return ACT_RET_PRS_ERR;
    }
    *cur_arg += 2;
  }

  (*cur_arg)++;

  /* Register processing function. */
  rule->action_ptr = tcp_action_switch_stream_mode;
  rule->check_ptr  = check_tcp_switch_stream_mode;
  rule->action = ACT_CUSTOM;
  rule->arg.act.p[0] = (void *)(uintptr_t)mode;
  rule->arg.act.p[1] = (void *)mux_proto;
  return ACT_RET_PRS_OK;
}

/* 0=OK, <0=Alert, >0=Warning */
static enum act_parse_ret stream_parse_use_service(const char **args, int *cur_arg,
                                                   struct proxy *px, struct act_rule *rule,
                                                   char **err)
{
  struct action_kw *kw;

  /* Check if the service name exists. */
  if (*(args[*cur_arg]) == 0) {
    memprintf(err, "'%s' expects a service name.", args[0]);
    return ACT_RET_PRS_ERR;
  }

  /* lookup for keyword corresponding to a service. */
  kw = action_lookup(&service_keywords, args[*cur_arg]);
  if (!kw) {
    memprintf(err, "'%s' unknown service name.", args[1]);
    return ACT_RET_PRS_ERR;
  }
  (*cur_arg)++;

  /* executes specific rule parser. */
  rule->kw = kw;
  if (kw->parse((const char **)args, cur_arg, px, rule, err) == ACT_RET_PRS_ERR)
    return ACT_RET_PRS_ERR;

  /* Register processing function. */
  rule->action_ptr = process_use_service;
  rule->action = ACT_CUSTOM;

  return ACT_RET_PRS_OK;
}

void service_keywords_register(struct action_kw_list *kw_list)
{
  LIST_APPEND(&service_keywords, &kw_list->list);
}

struct action_kw *service_find(const char *kw)
{
  return action_lookup(&service_keywords, kw);
}

/* Lists the known services on <out>. If <out> is null, emit them on stdout one
 * per line.
 */
void list_services(FILE *out)
{
  const struct action_kw *akwp, *akwn;
  struct action_kw_list *kw_list;
  int found = 0;
  int i;

  if (out)
    fprintf(out, "Available services :");

  for (akwn = akwp = NULL;; akwp = akwn) {
    list_for_each_entry(kw_list, &service_keywords, list) {
      for (i = 0; kw_list->kw[i].kw != NULL; i++) {
        if (strordered(akwp ? akwp->kw : NULL,
                 kw_list->kw[i].kw,
                 akwn != akwp ? akwn->kw : NULL))
          akwn = &kw_list->kw[i];
        found = 1;
      }
    }
    if (akwn == akwp)
      break;
    if (out)
      fprintf(out, " %s", akwn->kw);
    else
      printf("%s\n", akwn->kw);
  }
  if (!found && out)
    fprintf(out, " none\n");
}

/* appctx context used by the "show sess" command */
/* flags used for show_sess_ctx.flags */
#define CLI_SHOWSESS_F_SUSP  0x00000001   /* show only suspicious streams */

struct show_sess_ctx {
  struct bref bref; /* back-reference from the session being dumped */
  void *target;   /* session we want to dump, or NULL for all */
  unsigned int thr;       /* the thread number being explored (0..MAX_THREADS-1) */
  unsigned int uid; /* if non-null, the uniq_id of the session being dumped */
  unsigned int min_age;   /* minimum age of streams to dump */
  unsigned int flags;     /* CLI_SHOWSESS_* */
  int section;    /* section of the session being dumped */
  int pos;    /* last position of the current session's buffer */
};

/* This function appends a complete dump of a stream state onto the buffer,
 * possibly anonymizing using the specified anon_key. The caller is responsible
 * for ensuring that enough room remains in the buffer to dump a complete
 * stream at once. Each new output line will be prefixed with <pfx> if non-null,
 * which is used to preserve indenting.
 */
void strm_dump_to_buffer(struct buffer *buf, const struct stream *strm, const char *pfx, uint32_t anon_key)
{
  struct stconn *scf, *scb;
  struct tm tm;
  extern const char *monthname[12];
  char pn[INET6_ADDRSTRLEN];
  struct connection *conn;
  struct appctx *tmpctx;

  pfx = pfx ? pfx : "";

  get_localtime(strm->logs.accept_date.tv_sec, &tm);
  chunk_appendf(buf,
         "%p: [%02d/%s/%04d:%02d:%02d:%02d.%06d] id=%u proto=%s",
         strm,
         tm.tm_mday, monthname[tm.tm_mon], tm.tm_year+1900,
         tm.tm_hour, tm.tm_min, tm.tm_sec, (int)(strm->logs.accept_date.tv_usec),
         strm->uniq_id,
         strm_li(strm) ? strm_li(strm)->rx.proto->name : "?");

  conn = objt_conn(strm_orig(strm));
  switch (conn && conn_get_src(conn) ? addr_to_str(conn->src, pn, sizeof(pn)) : AF_UNSPEC) {
  case AF_INET:
  case AF_INET6:
    chunk_appendf(buf, " source=%s:%d\n",
                  HA_ANON_STR(anon_key, pn), get_host_port(conn->src));
    break;
  case AF_UNIX:
    chunk_appendf(buf, " source=unix:%d\n", strm_li(strm)->luid);
    break;
  default:
    /* no more information to print right now */
    chunk_appendf(buf, "\n");
    break;
  }

  chunk_appendf(buf,
         "%s  flags=0x%x, conn_retries=%d, conn_exp=%s conn_et=0x%03x srv_conn=%p, pend_pos=%p waiting=%d epoch=%#x\n", pfx,
         strm->flags, strm->conn_retries,
         strm->conn_exp ?
                 tick_is_expired(strm->conn_exp, now_ms) ? "<PAST>" :
                         human_time(TICKS_TO_MS(strm->conn_exp - now_ms),
                         TICKS_TO_MS(1000)) : "<NEVER>",
         strm->conn_err_type, strm->srv_conn, strm->pend_pos,
         LIST_INLIST(&strm->buffer_wait.list), strm->stream_epoch);

  chunk_appendf(buf,
         "%s  frontend=%s (id=%u mode=%s), listener=%s (id=%u)", pfx,
         HA_ANON_STR(anon_key, strm_fe(strm)->id), strm_fe(strm)->uuid, proxy_mode_str(strm_fe(strm)->mode),
         strm_li(strm) ? strm_li(strm)->name ? strm_li(strm)->name : "?" : "?",
         strm_li(strm) ? strm_li(strm)->luid : 0);

  switch (conn && conn_get_dst(conn) ? addr_to_str(conn->dst, pn, sizeof(pn)) : AF_UNSPEC) {
  case AF_INET:
  case AF_INET6:
    chunk_appendf(buf, " addr=%s:%d\n",
           HA_ANON_STR(anon_key, pn), get_host_port(conn->dst));
    break;
  case AF_UNIX:
    chunk_appendf(buf, " addr=unix:%d\n", strm_li(strm)->luid);
    break;
  default:
    /* no more information to print right now */
    chunk_appendf(buf, "\n");
    break;
  }

  if (strm->be->cap & PR_CAP_BE)
    chunk_appendf(buf,
           "%s  backend=%s (id=%u mode=%s)", pfx,
           HA_ANON_STR(anon_key, strm->be->id),
           strm->be->uuid, proxy_mode_str(strm->be->mode));
  else
    chunk_appendf(buf, "%s  backend=<NONE> (id=-1 mode=-)", pfx);

  conn = sc_conn(strm->scb);
  switch (conn && conn_get_src(conn) ? addr_to_str(conn->src, pn, sizeof(pn)) : AF_UNSPEC) {
  case AF_INET:
  case AF_INET6:
    chunk_appendf(buf, " addr=%s:%d\n",
           HA_ANON_STR(anon_key, pn), get_host_port(conn->src));
    break;
  case AF_UNIX:
    chunk_appendf(buf, " addr=unix\n");
    break;
  default:
    /* no more information to print right now */
    chunk_appendf(buf, "\n");
    break;
  }

  if (strm->be->cap & PR_CAP_BE)
    chunk_appendf(buf,
           "%s  server=%s (id=%u)", pfx,
           objt_server(strm->target) ? HA_ANON_STR(anon_key, __objt_server(strm->target)->id) : "<none>",
           objt_server(strm->target) ? __objt_server(strm->target)->puid : 0);
  else
    chunk_appendf(buf, "%s  server=<NONE> (id=-1)", pfx);

  switch (conn && conn_get_dst(conn) ? addr_to_str(conn->dst, pn, sizeof(pn)) : AF_UNSPEC) {
  case AF_INET:
  case AF_INET6:
    chunk_appendf(buf, " addr=%s:%d\n",
           HA_ANON_STR(anon_key, pn), get_host_port(conn->dst));
    break;
  case AF_UNIX:
    chunk_appendf(buf, " addr=unix\n");
    break;
  default:
    /* no more information to print right now */
    chunk_appendf(buf, "\n");
    break;
  }

  chunk_appendf(buf,
          "%s  task=%p (state=0x%02x nice=%d calls=%u rate=%u exp=%s tid=%d(%d/%d)%s", pfx,
         strm->task,
         strm->task->state,
         strm->task->nice, strm->task->calls, read_freq_ctr(&strm->call_rate),
         strm->task->expire ?
                 tick_is_expired(strm->task->expire, now_ms) ? "<PAST>" :
                         human_time(TICKS_TO_MS(strm->task->expire - now_ms),
                         TICKS_TO_MS(1000)) : "<NEVER>",
               strm->task->tid,
               ha_thread_info[strm->task->tid].tgid,
               ha_thread_info[strm->task->tid].ltid,
         task_in_rq(strm->task) ? ", running" : "");

  chunk_appendf(buf,
         " age=%s)\n",
         human_time(ns_to_sec(now_ns) - ns_to_sec(strm->logs.request_ts), 1));

  if (strm->txn)
    chunk_appendf(buf,
          "%s  txn=%p flags=0x%x meth=%d status=%d req.st=%s rsp.st=%s req.f=0x%02x rsp.f=0x%02x\n", pfx,
          strm->txn, strm->txn->flags, strm->txn->meth, strm->txn->status,
          h1_msg_state_str(strm->txn->req.msg_state), h1_msg_state_str(strm->txn->rsp.msg_state),
          strm->txn->req.flags, strm->txn->rsp.flags);

  scf = strm->scf;
  chunk_appendf(buf, "%s  scf=%p flags=0x%08x state=%s endp=%s,%p,0x%08x sub=%d", pfx,
          scf, scf->flags, sc_state_str(scf->state),
          (sc_ep_test(scf, SE_FL_T_MUX) ? "CONN" : (sc_ep_test(scf, SE_FL_T_APPLET) ? "APPCTX" : "NONE")),
          scf->sedesc->se, sc_ep_get(scf), scf->wait_event.events);
  chunk_appendf(buf, " rex=%s",
          sc_ep_rcv_ex(scf) ? human_time(TICKS_TO_MS(sc_ep_rcv_ex(scf) - now_ms), TICKS_TO_MS(1000)) : "<NEVER>");
  chunk_appendf(buf, " wex=%s\n",
          sc_ep_snd_ex(scf) ? human_time(TICKS_TO_MS(sc_ep_snd_ex(scf) - now_ms), TICKS_TO_MS(1000)) : "<NEVER>");

  chunk_appendf(&trash, "%s    iobuf.flags=0x%08x .pipe=%d .buf=%u@%p+%u/%u\n", pfx,
          scf->sedesc->iobuf.flags,
          scf->sedesc->iobuf.pipe ? scf->sedesc->iobuf.pipe->data : 0,
          scf->sedesc->iobuf.buf ? (unsigned int)b_data(scf->sedesc->iobuf.buf): 0,
          scf->sedesc->iobuf.buf ? b_orig(scf->sedesc->iobuf.buf): NULL,
          scf->sedesc->iobuf.buf ? (unsigned int)b_head_ofs(scf->sedesc->iobuf.buf): 0,
          scf->sedesc->iobuf.buf ? (unsigned int)b_size(scf->sedesc->iobuf.buf): 0);

  if ((conn = sc_conn(scf)) != NULL) {
    if (conn->mux && conn->mux->show_sd) {
      char muxpfx[100] = "";

      snprintf(muxpfx, sizeof(muxpfx), "%s      ", pfx);
      chunk_appendf(buf, "%s     ", pfx);
      conn->mux->show_sd(buf, scf->sedesc, muxpfx);
      chunk_appendf(buf, "\n");
    }

    chunk_appendf(buf,
                  "%s      co0=%p ctrl=%s xprt=%s mux=%s data=%s target=%s:%p\n", pfx,
            conn,
            conn_get_ctrl_name(conn),
            conn_get_xprt_name(conn),
            conn_get_mux_name(conn),
            sc_get_data_name(scf),
                  obj_type_name(conn->target),
                  obj_base_ptr(conn->target));

    chunk_appendf(buf,
                  "%s      flags=0x%08x fd=%d fd.state=%02x updt=%d fd.tmask=0x%lx\n", pfx,
                  conn->flags,
                  conn_fd(conn),
                  conn_fd(conn) >= 0 ? fdtab[conn->handle.fd].state : 0,
                  conn_fd(conn) >= 0 ? !!(fdtab[conn->handle.fd].update_mask & ti->ltid_bit) : 0,
            conn_fd(conn) >= 0 ? fdtab[conn->handle.fd].thread_mask: 0);
  }
  else if ((tmpctx = sc_appctx(scf)) != NULL) {
    chunk_appendf(buf,
                  "%s      app0=%p st0=%d st1=%d applet=%s tid=%d nice=%d calls=%u rate=%u\n", pfx,
            tmpctx,
            tmpctx->st0,
            tmpctx->st1,
                  tmpctx->applet->name,
                  tmpctx->t->tid,
                  tmpctx->t->nice, tmpctx->t->calls, read_freq_ctr(&tmpctx->call_rate));
  }

  scb = strm->scb;
  chunk_appendf(buf, "%s  scb=%p flags=0x%08x state=%s endp=%s,%p,0x%08x sub=%d", pfx,
          scb, scb->flags, sc_state_str(scb->state),
          (sc_ep_test(scb, SE_FL_T_MUX) ? "CONN" : (sc_ep_test(scb, SE_FL_T_APPLET) ? "APPCTX" : "NONE")),
          scb->sedesc->se, sc_ep_get(scb), scb->wait_event.events);
  chunk_appendf(buf, " rex=%s",
          sc_ep_rcv_ex(scb) ? human_time(TICKS_TO_MS(sc_ep_rcv_ex(scb) - now_ms), TICKS_TO_MS(1000)) : "<NEVER>");
  chunk_appendf(buf, " wex=%s\n",
          sc_ep_snd_ex(scb) ? human_time(TICKS_TO_MS(sc_ep_snd_ex(scb) - now_ms), TICKS_TO_MS(1000)) : "<NEVER>");

  chunk_appendf(&trash, "%s    iobuf.flags=0x%08x .pipe=%d .buf=%u@%p+%u/%u\n", pfx,
          scb->sedesc->iobuf.flags,
          scb->sedesc->iobuf.pipe ? scb->sedesc->iobuf.pipe->data : 0,
          scb->sedesc->iobuf.buf ? (unsigned int)b_data(scb->sedesc->iobuf.buf): 0,
          scb->sedesc->iobuf.buf ? b_orig(scb->sedesc->iobuf.buf): NULL,
          scb->sedesc->iobuf.buf ? (unsigned int)b_head_ofs(scb->sedesc->iobuf.buf): 0,
          scb->sedesc->iobuf.buf ? (unsigned int)b_size(scb->sedesc->iobuf.buf): 0);

  if ((conn = sc_conn(scb)) != NULL) {
    if (conn->mux && conn->mux->show_sd) {
      char muxpfx[100] = "";

      snprintf(muxpfx, sizeof(muxpfx), "%s      ", pfx);
      chunk_appendf(buf, "%s     ", pfx);
      conn->mux->show_sd(buf, scb->sedesc, muxpfx);
      chunk_appendf(buf, "\n");
    }

    chunk_appendf(buf,
                  "%s      co1=%p ctrl=%s xprt=%s mux=%s data=%s target=%s:%p\n", pfx,
            conn,
            conn_get_ctrl_name(conn),
            conn_get_xprt_name(conn),
            conn_get_mux_name(conn),
            sc_get_data_name(scb),
                  obj_type_name(conn->target),
                  obj_base_ptr(conn->target));

    chunk_appendf(buf,
                  "%s      flags=0x%08x fd=%d fd.state=%02x updt=%d fd.tmask=0x%lx\n", pfx,
                  conn->flags,
                  conn_fd(conn),
                  conn_fd(conn) >= 0 ? fdtab[conn->handle.fd].state : 0,
                  conn_fd(conn) >= 0 ? !!(fdtab[conn->handle.fd].update_mask & ti->ltid_bit) : 0,
            conn_fd(conn) >= 0 ? fdtab[conn->handle.fd].thread_mask: 0);
  }
  else if ((tmpctx = sc_appctx(scb)) != NULL) {
    chunk_appendf(buf,
                  "%s      app1=%p st0=%d st1=%d applet=%s tid=%d nice=%d calls=%u rate=%u\n", pfx,
            tmpctx,
            tmpctx->st0,
            tmpctx->st1,
                  tmpctx->applet->name,
                  tmpctx->t->tid,
                  tmpctx->t->nice, tmpctx->t->calls, read_freq_ctr(&tmpctx->call_rate));
  }

  if (HAS_FILTERS(strm)) {
    const struct filter *flt;

    chunk_appendf(buf, "%s  filters={", pfx);
    list_for_each_entry(flt, &strm->strm_flt.filters, list) {
      if (flt->list.p != &strm->strm_flt.filters)
        chunk_appendf(buf, ", ");
      chunk_appendf(buf, "%p=\"%s\"", flt, FLT_ID(flt));
    }
    chunk_appendf(buf, "}\n");
  }

  chunk_appendf(buf,
         "%s  req=%p (f=0x%06x an=0x%x tofwd=%d total=%lld)\n"
         "%s      an_exp=%s buf=%p data=%p o=%u p=%u i=%u size=%u\n",
         pfx,
         &strm->req,
         strm->req.flags, strm->req.analysers,
         strm->req.to_forward, strm->req.total,
         pfx,
         strm->req.analyse_exp ?
         human_time(TICKS_TO_MS(strm->req.analyse_exp - now_ms),
        TICKS_TO_MS(1000)) : "<NEVER>",
         &strm->req.buf,
         b_orig(&strm->req.buf), (unsigned int)co_data(&strm->req),
         (unsigned int)ci_head_ofs(&strm->req), (unsigned int)ci_data(&strm->req),
         (unsigned int)strm->req.buf.size);

  if (IS_HTX_STRM(strm)) {
    struct htx *htx = htxbuf(&strm->req.buf);

    chunk_appendf(buf,
            "%s      htx=%p flags=0x%x size=%u data=%u used=%u wrap=%s extra=%llu\n", pfx,
            htx, htx->flags, htx->size, htx->data, htx_nbblks(htx),
            (htx->tail >= htx->head) ? "NO" : "YES",
            (unsigned long long)htx->extra);
  }
  if (HAS_FILTERS(strm) && strm->strm_flt.current[0]) {
    const struct filter *flt = strm->strm_flt.current[0];

    chunk_appendf(buf, "%s      current_filter=%p (id=\"%s\" flags=0x%x pre=0x%x post=0x%x) \n", pfx,
            flt, flt->config->id, flt->flags, flt->pre_analyzers, flt->post_analyzers);
  }

  chunk_appendf(buf,
         "%s  res=%p (f=0x%06x an=0x%x tofwd=%d total=%lld)\n"
         "%s      an_exp=%s buf=%p data=%p o=%u p=%u i=%u size=%u\n",
         pfx,
         &strm->res,
         strm->res.flags, strm->res.analysers,
         strm->res.to_forward, strm->res.total,
         pfx,
         strm->res.analyse_exp ?
         human_time(TICKS_TO_MS(strm->res.analyse_exp - now_ms),
        TICKS_TO_MS(1000)) : "<NEVER>",
         &strm->res.buf,
               b_orig(&strm->res.buf), (unsigned int)co_data(&strm->res),
               (unsigned int)ci_head_ofs(&strm->res), (unsigned int)ci_data(&strm->res),
         (unsigned int)strm->res.buf.size);

  if (IS_HTX_STRM(strm)) {
    struct htx *htx = htxbuf(&strm->res.buf);

    chunk_appendf(buf,
            "%s      htx=%p flags=0x%x size=%u data=%u used=%u wrap=%s extra=%llu\n", pfx,
            htx, htx->flags, htx->size, htx->data, htx_nbblks(htx),
            (htx->tail >= htx->head) ? "NO" : "YES",
            (unsigned long long)htx->extra);
  }

  if (HAS_FILTERS(strm) && strm->strm_flt.current[1]) {
    const struct filter *flt = strm->strm_flt.current[1];

    chunk_appendf(buf, "%s      current_filter=%p (id=\"%s\" flags=0x%x pre=0x%x post=0x%x) \n", pfx,
            flt, flt->config->id, flt->flags, flt->pre_analyzers, flt->post_analyzers);
  }

  if (strm->current_rule_list && strm->current_rule) {
    const struct act_rule *rule = strm->current_rule;
    chunk_appendf(buf, "%s  current_rule=\"%s\" [%s:%d]\n", pfx, rule->kw->kw, rule->conf.file, rule->conf.line);
  }
}

/* This function dumps a complete stream state onto the stream connector's
 * read buffer. The stream has to be set in strm. It returns 0 if the output
 * buffer is full and it needs to be called again, otherwise non-zero. It is
 * designed to be called from stats_dump_strm_to_buffer() below.
 */
static int stats_dump_full_strm_to_buffer(struct stconn *sc, struct stream *strm)
{
  struct appctx *appctx = __sc_appctx(sc);
  struct show_sess_ctx *ctx = appctx->svcctx;

  chunk_reset(&trash);

  if (ctx->section > 0 && ctx->uid != strm->uniq_id) {
    /* stream changed, no need to go any further */
    chunk_appendf(&trash, "  *** session terminated while we were watching it ***\n");
    if (applet_putchk(appctx, &trash) == -1)
      goto full;
    goto done;
  }

  switch (ctx->section) {
  case 0: /* main status of the stream */
    ctx->uid = strm->uniq_id;
    ctx->section = 1;
    __fallthrough;

  case 1:
    strm_dump_to_buffer(&trash, strm, "", appctx->cli_anon_key);
    if (applet_putchk(appctx, &trash) == -1)
      goto full;

    /* use other states to dump the contents */
  }
  /* end of dump */
 done:
  ctx->uid = 0;
  ctx->section = 0;
  return 1;
 full:
  return 0;
}

static int cli_parse_show_sess(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct show_sess_ctx *ctx = applet_reserve_svcctx(appctx, sizeof(*ctx));

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

  /* now all sessions by default */
  ctx->target = NULL;
  ctx->min_age = 0;
  ctx->section = 0; /* start with stream status */
  ctx->pos = 0;
  ctx->thr = 0;

  if (*args[2] && strcmp(args[2], "older") == 0) {
    unsigned timeout;
    const char *res;

    if (!*args[3])
      return cli_err(appctx, "Expects a minimum age (in seconds by default).\n");

    res = parse_time_err(args[3], &timeout, TIME_UNIT_S);
    if (res != 0)
      return cli_err(appctx, "Invalid age.\n");

    ctx->min_age = timeout;
    ctx->target = (void *)-1; /* show all matching entries */
  }
  else if (*args[2] && strcmp(args[2], "susp") == 0) {
    ctx->flags |= CLI_SHOWSESS_F_SUSP;
    ctx->target = (void *)-1; /* show all matching entries */
  }
  else if (*args[2] && strcmp(args[2], "all") == 0)
    ctx->target = (void *)-1;
  else if (*args[2])
    ctx->target = (void *)strtoul(args[2], NULL, 0);

  /* The back-ref must be reset, it will be detected and set by
   * the dump code upon first invocation.
   */
  LIST_INIT(&ctx->bref.users);

  /* let's set our own stream's epoch to the current one and increment
   * it so that we know which streams were already there before us.
   */
  appctx_strm(appctx)->stream_epoch = _HA_ATOMIC_FETCH_ADD(&stream_epoch, 1);
  return 0;
}

/* This function dumps all streams' states 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. It proceeds in an isolated
 * thread so there is no thread safety issue here.
 */
static int cli_io_handler_dump_sess(struct appctx *appctx)
{
  struct show_sess_ctx *ctx = appctx->svcctx;
  struct stconn *sc = appctx_sc(appctx);
  struct connection *conn;

  thread_isolate();

  if (ctx->thr >= global.nbthread) {
    /* already terminated */
    goto done;
  }

  /* FIXME: Don't watch the other side !*/
  if (unlikely(sc_opposite(sc)->flags & SC_FL_SHUT_DONE)) {
    /* If we're forced to shut down, we might have to remove our
     * reference to the last stream being dumped.
     */
    if (!LIST_ISEMPTY(&ctx->bref.users)) {
      LIST_DELETE(&ctx->bref.users);
      LIST_INIT(&ctx->bref.users);
    }
    goto done;
  }

  chunk_reset(&trash);

  /* first, let's detach the back-ref from a possible previous stream */
  if (!LIST_ISEMPTY(&ctx->bref.users)) {
    LIST_DELETE(&ctx->bref.users);
    LIST_INIT(&ctx->bref.users);
  } else if (!ctx->bref.ref) {
    /* first call, start with first stream */
    ctx->bref.ref = ha_thread_ctx[ctx->thr].streams.n;
  }

  /* and start from where we stopped */
  while (1) {
    char pn[INET6_ADDRSTRLEN];
    struct stream *curr_strm;
    int done= 0;

    if (ctx->bref.ref == &ha_thread_ctx[ctx->thr].streams)
      done = 1;
    else {
      /* check if we've found a stream created after issuing the "show sess" */
      curr_strm = LIST_ELEM(ctx->bref.ref, struct stream *, list);
      if ((int)(curr_strm->stream_epoch - appctx_strm(appctx)->stream_epoch) > 0)
        done = 1;
    }

    if (done) {
      ctx->thr++;
      if (ctx->thr >= global.nbthread)
        break;
      ctx->bref.ref = ha_thread_ctx[ctx->thr].streams.n;
      continue;
    }

    if (ctx->min_age) {
      uint age = ns_to_sec(now_ns) - ns_to_sec(curr_strm->logs.request_ts);
      if (age < ctx->min_age)
        goto next_sess;
    }

    if (ctx->flags & CLI_SHOWSESS_F_SUSP) {
      /* only show suspicious streams. Non-suspicious ones have a valid
       * expiration date in the future and a valid front endpoint.
       */
      if (curr_strm->task->expire &&
          !tick_is_expired(curr_strm->task->expire, now_ms) &&
          curr_strm->scf && curr_strm->scf->sedesc && curr_strm->scf->sedesc->se)
        goto next_sess;
    }

    if (ctx->target) {
      if (ctx->target != (void *)-1 && ctx->target != curr_strm)
        goto next_sess;

      LIST_APPEND(&curr_strm->back_refs, &ctx->bref.users);
      /* call the proper dump() function and return if we're missing space */
      if (!stats_dump_full_strm_to_buffer(sc, curr_strm))
        goto full;

      /* stream dump complete */
      LIST_DELETE(&ctx->bref.users);
      LIST_INIT(&ctx->bref.users);
      if (ctx->target != (void *)-1) {
        ctx->target = NULL;
        break;
      }
      else
        goto next_sess;
    }

    chunk_appendf(&trash,
           "%p: proto=%s",
           curr_strm,
           strm_li(curr_strm) ? strm_li(curr_strm)->rx.proto->name : "?");

    conn = objt_conn(strm_orig(curr_strm));
    switch (conn && conn_get_src(conn) ? addr_to_str(conn->src, pn, sizeof(pn)) : AF_UNSPEC) {
    case AF_INET:
    case AF_INET6:
      chunk_appendf(&trash,
             " src=%s:%d fe=%s be=%s srv=%s",
             HA_ANON_CLI(pn),
             get_host_port(conn->src),
             HA_ANON_CLI(strm_fe(curr_strm)->id),
             (curr_strm->be->cap & PR_CAP_BE) ? HA_ANON_CLI(curr_strm->be->id) : "<NONE>",
             objt_server(curr_strm->target) ? HA_ANON_CLI(__objt_server(curr_strm->target)->id) : "<none>"
             );
      break;
    case AF_UNIX:
      chunk_appendf(&trash,
             " src=unix:%d fe=%s be=%s srv=%s",
             strm_li(curr_strm)->luid,
             HA_ANON_CLI(strm_fe(curr_strm)->id),
             (curr_strm->be->cap & PR_CAP_BE) ? HA_ANON_CLI(curr_strm->be->id) : "<NONE>",
             objt_server(curr_strm->target) ? HA_ANON_CLI(__objt_server(curr_strm->target)->id) : "<none>"
             );
      break;
    }

    chunk_appendf(&trash,
           " ts=%02x epoch=%#x age=%s calls=%u rate=%u cpu=%llu lat=%llu",
                 curr_strm->task->state, curr_strm->stream_epoch,
                 human_time(ns_to_sec(now_ns) - ns_to_sec(curr_strm->logs.request_ts), 1),
                 curr_strm->task->calls, read_freq_ctr(&curr_strm->call_rate),
                 (unsigned long long)curr_strm->cpu_time, (unsigned long long)curr_strm->lat_time);

    chunk_appendf(&trash,
           " rq[f=%06xh,i=%u,an=%02xh",
           curr_strm->req.flags,
                 (unsigned int)ci_data(&curr_strm->req),
           curr_strm->req.analysers);

    chunk_appendf(&trash,
           ",ax=%s]",
           curr_strm->req.analyse_exp ?
           human_time(TICKS_TO_MS(curr_strm->req.analyse_exp - now_ms),
          TICKS_TO_MS(1000)) : "");

    chunk_appendf(&trash,
           " rp[f=%06xh,i=%u,an=%02xh",
           curr_strm->res.flags,
                 (unsigned int)ci_data(&curr_strm->res),
           curr_strm->res.analysers);
    chunk_appendf(&trash,
           ",ax=%s]",
           curr_strm->res.analyse_exp ?
           human_time(TICKS_TO_MS(curr_strm->res.analyse_exp - now_ms),
          TICKS_TO_MS(1000)) : "");

    conn = sc_conn(curr_strm->scf);
    chunk_appendf(&trash," scf=[%d,%1xh,fd=%d",
            curr_strm->scf->state, curr_strm->scf->flags, conn_fd(conn));
    chunk_appendf(&trash, ",rex=%s",
            sc_ep_rcv_ex(curr_strm->scf) ?
            human_time(TICKS_TO_MS(sc_ep_rcv_ex(curr_strm->scf) - now_ms),
           TICKS_TO_MS(1000)) : "");
    chunk_appendf(&trash,",wex=%s]",
            sc_ep_snd_ex(curr_strm->scf) ?
            human_time(TICKS_TO_MS(sc_ep_snd_ex(curr_strm->scf) - now_ms),
           TICKS_TO_MS(1000)) : "");

    conn = sc_conn(curr_strm->scb);
    chunk_appendf(&trash, " scb=[%d,%1xh,fd=%d",
            curr_strm->scb->state, curr_strm->scb->flags, conn_fd(conn));
    chunk_appendf(&trash, ",rex=%s",
            sc_ep_rcv_ex(curr_strm->scb) ?
            human_time(TICKS_TO_MS(sc_ep_rcv_ex(curr_strm->scb) - now_ms),
           TICKS_TO_MS(1000)) : "");
    chunk_appendf(&trash, ",wex=%s]",
            sc_ep_snd_ex(curr_strm->scb) ?
            human_time(TICKS_TO_MS(sc_ep_snd_ex(curr_strm->scb) - now_ms),
           TICKS_TO_MS(1000)) : "");

    chunk_appendf(&trash,
           " exp=%s rc=%d c_exp=%s",
           curr_strm->task->expire ?
           human_time(TICKS_TO_MS(curr_strm->task->expire - now_ms),
          TICKS_TO_MS(1000)) : "",
           curr_strm->conn_retries,
           curr_strm->conn_exp ?
           human_time(TICKS_TO_MS(curr_strm->conn_exp - now_ms),
          TICKS_TO_MS(1000)) : "");
    if (task_in_rq(curr_strm->task))
      chunk_appendf(&trash, " run(nice=%d)", curr_strm->task->nice);

    chunk_appendf(&trash, "\n");

    if (applet_putchk(appctx, &trash) == -1) {
      /* let's try again later from this stream. We add ourselves into
       * this stream's users so that it can remove us upon termination.
       */
      LIST_APPEND(&curr_strm->back_refs, &ctx->bref.users);
      goto full;
    }

  next_sess:
    ctx->bref.ref = curr_strm->list.n;
  }

  if (ctx->target && ctx->target != (void *)-1) {
    /* specified stream not found */
    if (ctx->section > 0)
      chunk_appendf(&trash, "  *** session terminated while we were watching it ***\n");
    else
      chunk_appendf(&trash, "Session not found.\n");

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

    ctx->target = NULL;
    ctx->uid = 0;
    goto done;
  }

 done:
  thread_release();
  return 1;
 full:
  thread_release();
  return 0;
}

static void cli_release_show_sess(struct appctx *appctx)
{
  struct show_sess_ctx *ctx = appctx->svcctx;

  if (ctx->thr < global.nbthread) {
    /* a dump was aborted, either in error or timeout. We need to
     * safely detach from the target stream's list. It's mandatory
     * to lock because a stream on the target thread could be moving
     * our node.
     */
    thread_isolate();
    if (!LIST_ISEMPTY(&ctx->bref.users))
      LIST_DELETE(&ctx->bref.users);
    thread_release();
  }
}

/* Parses the "shutdown session" directive, it always returns 1 */
static int cli_parse_shutdown_session(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct stream *strm, *ptr;
  int thr;

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

  ptr = (void *)strtoul(args[2], NULL, 0);
  if (!ptr)
    return cli_err(appctx, "Session pointer expected (use 'show sess').\n");

  strm = NULL;

  thread_isolate();

  /* first, look for the requested stream in the stream table */
  for (thr = 0; strm != ptr && thr < global.nbthread; thr++) {
    list_for_each_entry(strm, &ha_thread_ctx[thr].streams, list) {
      if (strm == ptr) {
        stream_shutdown(strm, SF_ERR_KILLED);
        break;
      }
    }
  }

  thread_release();

  /* do we have the stream ? */
  if (strm != ptr)
    return cli_err(appctx, "No such session (use 'show sess').\n");

  return 1;
}

/* Parses the "shutdown session server" directive, it always returns 1 */
static int cli_parse_shutdown_sessions_server(char **args, char *payload, struct appctx *appctx, void *private)
{
  struct server *sv;

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

  sv = cli_find_server(appctx, args[3]);
  if (!sv)
    return 1;

  /* kill all the stream that are on this server */
  HA_SPIN_LOCK(SERVER_LOCK, &sv->lock);
  srv_shutdown_streams(sv, SF_ERR_KILLED);
  HA_SPIN_UNLOCK(SERVER_LOCK, &sv->lock);
  return 1;
}

/* register cli keywords */
static struct cli_kw_list cli_kws = {{ },{
  { { "show", "sess",  NULL },             "show sess [<id>|all|susp|older <age>]   : report the list of current sessions or dump this exact session", cli_parse_show_sess, cli_io_handler_dump_sess, cli_release_show_sess },
  { { "shutdown", "session",  NULL },      "shutdown session [id]                   : kill a specific session",                                        cli_parse_shutdown_session, NULL, NULL },
  { { "shutdown", "sessions",  "server" }, "shutdown sessions server <bk>/<srv>     : kill sessions on a server",                                      cli_parse_shutdown_sessions_server, NULL, NULL },
  {{},}
}};

INITCALL1(STG_REGISTER, cli_register_kw, &cli_kws);

/* main configuration keyword registration. */
static struct action_kw_list stream_tcp_req_keywords = { ILH, {
  { "set-log-level", stream_parse_set_log_level },
  { "set-nice",      stream_parse_set_nice },
  { "switch-mode",   stream_parse_switch_mode },
  { "use-service",   stream_parse_use_service },
  { /* END */ }
}};

INITCALL1(STG_REGISTER, tcp_req_cont_keywords_register, &stream_tcp_req_keywords);

/* main configuration keyword registration. */
static struct action_kw_list stream_tcp_res_keywords = { ILH, {
  { "set-log-level", stream_parse_set_log_level },
  { "set-nice",     stream_parse_set_nice },
  { /* END */ }
}};

INITCALL1(STG_REGISTER, tcp_res_cont_keywords_register, &stream_tcp_res_keywords);

static struct action_kw_list stream_http_req_keywords = { ILH, {
  { "set-log-level", stream_parse_set_log_level },
  { "set-nice",      stream_parse_set_nice },
  { "use-service",   stream_parse_use_service },
  { /* END */ }
}};

INITCALL1(STG_REGISTER, http_req_keywords_register, &stream_http_req_keywords);

static struct action_kw_list stream_http_res_keywords = { ILH, {
  { "set-log-level", stream_parse_set_log_level },
  { "set-nice",      stream_parse_set_nice },
  { /* END */ }
}};

INITCALL1(STG_REGISTER, http_res_keywords_register, &stream_http_res_keywords);

static struct action_kw_list stream_http_after_res_actions =  { ILH, {
  { "set-log-level", stream_parse_set_log_level },
  { /* END */ }
}};

INITCALL1(STG_REGISTER, http_after_res_keywords_register, &stream_http_after_res_actions);

static int smp_fetch_cur_client_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
{
  smp->flags = SMP_F_VOL_TXN;
  smp->data.type = SMP_T_SINT;
  if (!smp->strm)
    return 0;

  smp->data.u.sint = TICKS_TO_MS(smp->strm->scf->ioto);
  return 1;
}

static int smp_fetch_cur_server_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
{
  smp->flags = SMP_F_VOL_TXN;
  smp->data.type = SMP_T_SINT;
  if (!smp->strm)
    return 0;

  smp->data.u.sint = TICKS_TO_MS(smp->strm->scb->ioto);
  return 1;
}

static int smp_fetch_cur_tunnel_timeout(const struct arg *args, struct sample *smp, const char *km, void *private)
{
  smp->flags = SMP_F_VOL_TXN;
  smp->data.type = SMP_T_SINT;
  if (!smp->strm)
    return 0;

  smp->data.u.sint = TICKS_TO_MS(smp->strm->tunnel_timeout);
  return 1;
}

static int smp_fetch_last_rule_file(const struct arg *args, struct sample *smp, const char *km, void *private)
{
  smp->flags = SMP_F_VOL_TXN;
  smp->data.type = SMP_T_STR;
  if (!smp->strm || !smp->strm->last_rule_file)
    return 0;

  smp->flags |= SMP_F_CONST;
  smp->data.u.str.area = (char *)smp->strm->last_rule_file;
  smp->data.u.str.data = strlen(smp->strm->last_rule_file);
  return 1;
}

static int smp_fetch_last_rule_line(const struct arg *args, struct sample *smp, const char *km, void *private)
{
  smp->flags = SMP_F_VOL_TXN;
  smp->data.type = SMP_T_SINT;
  if (!smp->strm || !smp->strm->last_rule_line)
    return 0;

  smp->data.u.sint = smp->strm->last_rule_line;
  return 1;
}

/* Note: must not be declared <const> as its list will be overwritten.
 * Please take care of keeping this list alphabetically sorted.
 */
static struct sample_fetch_kw_list smp_kws = {ILH, {
  { "cur_client_timeout", smp_fetch_cur_client_timeout, 0, NULL, SMP_T_SINT, SMP_USE_FTEND, },
  { "cur_server_timeout", smp_fetch_cur_server_timeout, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
  { "cur_tunnel_timeout", smp_fetch_cur_tunnel_timeout, 0, NULL, SMP_T_SINT, SMP_USE_BKEND, },
  { "last_rule_file",     smp_fetch_last_rule_file,     0, NULL, SMP_T_STR,  SMP_USE_INTRN, },
  { "last_rule_line",     smp_fetch_last_rule_line,     0, NULL, SMP_T_SINT, SMP_USE_INTRN, },
  { NULL, NULL, 0, 0, 0 },
}};

INITCALL1(STG_REGISTER, sample_register_fetches, &smp_kws);

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

Coverage Report

Created: 2023-11-19 07:16