/*

 * util/config_file.c - reads and stores the config file for unbound.

 *

 * Copyright (c) 2007, NLnet Labs. All rights reserved.

 *

 * This software is open source.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions

 * are met:

 *

 * Redistributions of source code must retain the above copyright notice,

 * this list of conditions and the following disclaimer.

 *

 * Redistributions in binary form must reproduce the above copyright notice,

 * this list of conditions and the following disclaimer in the documentation

 * and/or other materials provided with the distribution.

 *

 * Neither the name of the NLNET LABS nor the names of its contributors may

 * be used to endorse or promote products derived from this software without

 * specific prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF

 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING

 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

/**

 * \file

 *

 * This file contains functions for the config file.

 */

#include "config.h"

#include <ctype.h>

#include <stdarg.h>

#include <errno.h>

#ifdef HAVE_TIME_H

#include <time.h>

#endif

#include "util/log.h"

#include "util/configyyrename.h"

#include "util/config_file.h"

#include "util/configparser.h"

#include "util/net_help.h"

#include "util/data/msgparse.h"

#include "util/module.h"

#include "util/regional.h"

#include "util/fptr_wlist.h"

#include "util/data/dname.h"

#include "util/random.h"

#include "util/rtt.h"

#include "services/cache/infra.h"

#include "sldns/wire2str.h"

#include "sldns/parseutil.h"

#include "iterator/iterator.h"

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif

#ifdef HAVE_GLOB_H

# include <glob.h>

#endif

#ifdef CLIENT_SUBNET

#include "edns-subnet/edns-subnet.h"

#endif

#ifdef HAVE_PWD_H

#include <pwd.h>

#endif

#ifndef USE_SYSTEM_TLS

#define USE_SYSTEM_TLS 0

#endif

/** from cfg username, after daemonize setup performed */

uid_t cfg_uid = (uid_t)-1;

/** from cfg username, after daemonize setup performed */

gid_t cfg_gid = (gid_t)-1;

/** for debug allow small timeout values for fast rollovers */

int autr_permit_small_holddown = 0;

/** size (in bytes) of stream wait buffers max */

size_t stream_wait_max = 4 * 1024 * 1024;

size_t http2_query_buffer_max = 4 * 1024 * 1024;

size_t http2_response_buffer_max = 4 * 1024 * 1024;

/** global config during parsing */

struct config_parser_state* cfg_parser = 0;

/** init ports possible for use */

static void init_outgoing_availports(int* array, int num);

/** init cookie with random data */

static void init_cookie_secret(uint8_t* cookie_secret, size_t cookie_secret_len);

struct config_file*

config_create(void)

{

  struct config_file* cfg;

  cfg = (struct config_file*)calloc(1, sizeof(struct config_file));

  if(!cfg)

    return NULL;

  /* the defaults if no config is present */

  cfg->verbosity = 1;

  cfg->stat_interval = 0;

  cfg->stat_cumulative = 0;

  cfg->stat_extended = 0;

  cfg->stat_inhibit_zero = 1;

  cfg->num_threads = 1;

  cfg->port = UNBOUND_DNS_PORT;

  cfg->do_ip4 = 1;

  cfg->do_ip6 = 1;

  cfg->do_udp = 1;

  cfg->do_tcp = 1;

  cfg->tcp_reuse_timeout = 60 * 1000; /* 60s in milisecs */

  cfg->max_reuse_tcp_queries = 200;

  cfg->tcp_upstream = 0;

  cfg->udp_upstream_without_downstream = 0;

  cfg->tcp_mss = 0;

  cfg->outgoing_tcp_mss = 0;

  cfg->tcp_idle_timeout = 30 * 1000; /* 30s in millisecs */

  cfg->tcp_auth_query_timeout = 3 * 1000; /* 3s in millisecs */

  cfg->do_tcp_keepalive = 0;

  cfg->tcp_keepalive_timeout = 120 * 1000; /* 120s in millisecs */

  cfg->sock_queue_timeout = 0; /* do not check timeout */

  cfg->ssl_service_key = NULL;

  cfg->ssl_service_pem = NULL;

  cfg->ssl_port = UNBOUND_DNS_OVER_TLS_PORT;

  cfg->ssl_upstream = 0;

  cfg->tls_cert_bundle = NULL;

  cfg->tls_win_cert = 0;

  cfg->tls_use_sni = 1;

  cfg->tls_use_system_policy_versions = USE_SYSTEM_TLS;

  cfg->https_port = UNBOUND_DNS_OVER_HTTPS_PORT;

  if(!(cfg->http_endpoint = strdup("/dns-query"))) goto error_exit;

  cfg->http_max_streams = 100;

  cfg->http_query_buffer_size = 4*1024*1024;

  cfg->http_response_buffer_size = 4*1024*1024;

  cfg->http_nodelay = 1;

  cfg->quic_port = UNBOUND_DNS_OVER_QUIC_PORT;

  cfg->quic_size = 8*1024*1024;

  cfg->use_syslog = 1;

  cfg->log_identity = NULL; /* changed later with argv[0] */

  cfg->log_time_ascii = 0;

  cfg->log_time_iso = 0;

  cfg->log_queries = 0;

  cfg->log_replies = 0;

  cfg->log_tag_queryreply = 0;

  cfg->log_local_actions = 0;

  cfg->log_servfail = 0;

  cfg->log_destaddr = 0;

  cfg->log_thread_id = 0;

#ifndef USE_WINSOCK

#  ifdef USE_MINI_EVENT

  /* select max 1024 sockets */

  cfg->outgoing_num_ports = 960;

  cfg->num_queries_per_thread = 512;

#  else

  /* libevent can use many sockets */

  cfg->outgoing_num_ports = 4096;

  cfg->num_queries_per_thread = 2048;

#  endif

  cfg->outgoing_num_tcp = 10;

  cfg->incoming_num_tcp = 10;

#else

  cfg->outgoing_num_ports = 48; /* windows is limited in num fds */

  cfg->num_queries_per_thread = 24;

  cfg->outgoing_num_tcp = 2; /* leaves 64-52=12 for: 4if,1stop,thread4 */

  cfg->incoming_num_tcp = 2;

#endif

  cfg->stream_wait_size = 4 * 1024 * 1024;

  cfg->edns_buffer_size = 1232; /* from DNS flagday recommendation */

  cfg->msg_buffer_size = 65552; /* 64 k + a small margin */

  cfg->msg_cache_size = 4 * 1024 * 1024;

  cfg->msg_cache_slabs = 0;

  cfg->jostle_time = 200;

  cfg->rrset_cache_size = 4 * 1024 * 1024;

  cfg->rrset_cache_slabs = 0;

  cfg->host_ttl = 900;

  cfg->bogus_ttl = 60;

  cfg->min_ttl = 0;

  cfg->max_ttl = 3600 * 24;

  cfg->max_negative_ttl = 3600;

  cfg->min_negative_ttl = 0;

  cfg->prefetch = 0;

  cfg->prefetch_key = 0;

  cfg->deny_any = 0;

  cfg->infra_cache_slabs = 0;

  cfg->infra_cache_numhosts = 10000;

  cfg->infra_cache_min_rtt = 50;

  cfg->infra_cache_max_rtt = 120000;

  cfg->infra_keep_probing = 0;

  cfg->delay_close = 0;

  cfg->udp_connect = 1;

  if(!(cfg->outgoing_avail_ports = (int*)calloc(65536, sizeof(int))))

    goto error_exit;

  init_outgoing_availports(cfg->outgoing_avail_ports, 65536);

  if(!(cfg->username = strdup(UB_USERNAME))) goto error_exit;

#ifdef HAVE_CHROOT

  if(!(cfg->chrootdir = strdup(CHROOT_DIR))) goto error_exit;

#endif

  if(!(cfg->directory = strdup(RUN_DIR))) goto error_exit;

  if(!(cfg->logfile = strdup(""))) goto error_exit;

  if(!(cfg->pidfile = strdup(PIDFILE))) goto error_exit;

  if(!(cfg->target_fetch_policy = strdup("3 2 1 0 0"))) goto error_exit;

  cfg->fast_server_permil = 0;

  cfg->fast_server_num = 3;

  cfg->donotqueryaddrs = NULL;

  cfg->donotquery_localhost = 1;

  cfg->root_hints = NULL;

  cfg->use_systemd = 0;

  cfg->do_daemonize = 1;

  cfg->if_automatic = 0;

  cfg->if_automatic_ports = NULL;

  cfg->so_rcvbuf = 0;

  cfg->so_sndbuf = 4*1024*1024;

  cfg->so_reuseport = REUSEPORT_DEFAULT;

  cfg->ip_transparent = 0;

  cfg->ip_freebind = 0;

  cfg->ip_dscp = 0;

  cfg->num_ifs = 0;

  cfg->ifs = NULL;

  cfg->num_out_ifs = 0;

  cfg->out_ifs = NULL;

  cfg->stubs = NULL;

  cfg->forwards = NULL;

  cfg->auths = NULL;

#ifdef CLIENT_SUBNET

  cfg->client_subnet = NULL;

  cfg->client_subnet_zone = NULL;

  cfg->client_subnet_opcode = LDNS_EDNS_CLIENT_SUBNET;

  cfg->client_subnet_always_forward = 0;

  cfg->max_client_subnet_ipv4 = 24;

  cfg->max_client_subnet_ipv6 = 56;

  cfg->min_client_subnet_ipv4 = 0;

  cfg->min_client_subnet_ipv6 = 0;

  cfg->max_ecs_tree_size_ipv4 = 100;

  cfg->max_ecs_tree_size_ipv6 = 100;

#endif

  cfg->views = NULL;

  cfg->acls = NULL;

  cfg->tcp_connection_limits = NULL;

  cfg->harden_short_bufsize = 1;

  cfg->harden_large_queries = 0;

  cfg->harden_glue = 1;

  cfg->harden_unverified_glue = 0;

  cfg->harden_dnssec_stripped = 1;

  cfg->harden_below_nxdomain = 1;

  cfg->harden_referral_path = 0;

  cfg->harden_algo_downgrade = 0;

  cfg->harden_unknown_additional = 0;

  cfg->use_caps_bits_for_id = 0;

  cfg->caps_whitelist = NULL;

  cfg->private_address = NULL;

  cfg->private_domain = NULL;

  cfg->unwanted_threshold = 0;

  cfg->hide_identity = 0;

  cfg->hide_version = 0;

  cfg->hide_trustanchor = 0;

  cfg->hide_http_user_agent = 0;

  cfg->identity = NULL;

  cfg->version = NULL;

  cfg->http_user_agent = NULL;

  cfg->nsid_cfg_str = NULL;

  cfg->nsid = NULL;

  cfg->nsid_len = 0;

  cfg->auto_trust_anchor_file_list = NULL;

  cfg->trust_anchor_file_list = NULL;

  cfg->trust_anchor_list = NULL;

  cfg->trusted_keys_file_list = NULL;

  cfg->trust_anchor_signaling = 1;

  cfg->root_key_sentinel = 1;

  cfg->domain_insecure = NULL;

  cfg->val_date_override = 0;

  cfg->val_sig_skew_min = 3600; /* at least daylight savings trouble */

  cfg->val_sig_skew_max = 86400; /* at most timezone settings trouble */

  cfg->val_max_restart = 5;

  cfg->val_clean_additional = 1;

  cfg->val_log_level = 0;

  cfg->val_log_squelch = 0;

  cfg->val_permissive_mode = 0;

  cfg->aggressive_nsec = 1;

  cfg->ignore_cd = 0;

  cfg->disable_edns_do = 0;

  cfg->serve_expired = 0;

  cfg->serve_expired_ttl = 86400;

  cfg->serve_expired_ttl_reset = 0;

  cfg->serve_expired_reply_ttl = 30;

  cfg->serve_expired_client_timeout = 1800;

  cfg->serve_original_ttl = 0;

  cfg->zonemd_permissive_mode = 0;

  cfg->add_holddown = 30*24*3600;

  cfg->del_holddown = 30*24*3600;

  cfg->keep_missing = 366*24*3600; /* one year plus a little leeway */

  cfg->permit_small_holddown = 0;

  cfg->key_cache_size = 4 * 1024 * 1024;

  cfg->key_cache_slabs = 0;

  cfg->neg_cache_size = 1 * 1024 * 1024;

  cfg->local_zones = NULL;

  cfg->local_zones_nodefault = NULL;

#ifdef USE_IPSET

  cfg->local_zones_ipset = NULL;

#endif

  cfg->local_zones_disable_default = 0;

  cfg->local_data = NULL;

  cfg->local_zone_overrides = NULL;

  cfg->unblock_lan_zones = 0;

  cfg->insecure_lan_zones = 0;

  cfg->python_script = NULL;

  cfg->dynlib_file = NULL;

  cfg->remote_control_enable = 0;

  cfg->control_ifs.first = NULL;

  cfg->control_ifs.last = NULL;

  cfg->control_port = UNBOUND_CONTROL_PORT;

  cfg->control_use_cert = 1;

  cfg->minimal_responses = 1;

  cfg->rrset_roundrobin = 1;

  cfg->unknown_server_time_limit = 376;

  cfg->discard_timeout = 1900; /* msec */

  cfg->wait_limit = 1000;

  cfg->wait_limit_cookie = 10000;

  cfg->wait_limit_netblock = NULL;

  cfg->wait_limit_cookie_netblock = NULL;

  cfg->max_udp_size = 1232; /* value taken from edns_buffer_size */

  if(!(cfg->server_key_file = strdup(RUN_DIR"/unbound_server.key")))

    goto error_exit;

  if(!(cfg->server_cert_file = strdup(RUN_DIR"/unbound_server.pem")))

    goto error_exit;

  if(!(cfg->control_key_file = strdup(RUN_DIR"/unbound_control.key")))

    goto error_exit;

  if(!(cfg->control_cert_file = strdup(RUN_DIR"/unbound_control.pem")))

    goto error_exit;

  if(!(cfg->module_conf = strdup("validator iterator"))) goto error_exit;

  if(!(cfg->val_nsec3_key_iterations =

    strdup("1024 150 2048 150 4096 150"))) goto error_exit;

#if defined(DNSTAP_SOCKET_PATH)

  if(!(cfg->dnstap_socket_path = strdup(DNSTAP_SOCKET_PATH)))

    goto error_exit;

#endif

  cfg->dnstap_bidirectional = 1;

  cfg->dnstap_tls = 1;

  cfg->disable_dnssec_lame_check = 0;

  cfg->ip_ratelimit_cookie = 0;

  cfg->ip_ratelimit = 0;

  cfg->ratelimit = 0;

  cfg->ip_ratelimit_slabs = 0;

  cfg->ratelimit_slabs = 0;

  cfg->ip_ratelimit_size = 4*1024*1024;

  cfg->ratelimit_size = 4*1024*1024;

  cfg->ratelimit_for_domain = NULL;

  cfg->ratelimit_below_domain = NULL;

  cfg->ip_ratelimit_factor = 10;

  cfg->ratelimit_factor = 10;

  cfg->ip_ratelimit_backoff = 0;

  cfg->ratelimit_backoff = 0;

  cfg->outbound_msg_retry = 5;

  cfg->max_sent_count = 32;

  cfg->max_query_restarts = 11;

  cfg->qname_minimisation = 1;

  cfg->qname_minimisation_strict = 0;

  cfg->shm_enable = 0;

  cfg->shm_key = 11777;

  cfg->edns_client_strings = NULL;

  cfg->edns_client_string_opcode = 65001;

  cfg->dnscrypt = 0;

  cfg->dnscrypt_port = 0;

  cfg->dnscrypt_provider = NULL;

  cfg->dnscrypt_provider_cert = NULL;

  cfg->dnscrypt_provider_cert_rotated = NULL;

  cfg->dnscrypt_secret_key = NULL;

  cfg->dnscrypt_shared_secret_cache_size = 4*1024*1024;

  cfg->dnscrypt_shared_secret_cache_slabs = 0;

  cfg->dnscrypt_nonce_cache_size = 4*1024*1024;

  cfg->dnscrypt_nonce_cache_slabs = 0;

  cfg->pad_responses = 1;

  cfg->pad_responses_block_size = 468; /* from RFC8467 */

  cfg->pad_queries = 1;

  cfg->pad_queries_block_size = 128; /* from RFC8467 */

#ifdef USE_IPSECMOD

  cfg->ipsecmod_enabled = 1;

  cfg->ipsecmod_ignore_bogus = 0;

  cfg->ipsecmod_hook = NULL;

  cfg->ipsecmod_max_ttl = 3600;

  cfg->ipsecmod_whitelist = NULL;

  cfg->ipsecmod_strict = 0;

#endif

  cfg->do_answer_cookie = 0;

  memset(cfg->cookie_secret, 0, sizeof(cfg->cookie_secret));

  cfg->cookie_secret_len = 16;

  init_cookie_secret(cfg->cookie_secret, cfg->cookie_secret_len);

  cfg->cookie_secret_file = NULL;

#ifdef USE_CACHEDB

  if(!(cfg->cachedb_backend = strdup("testframe"))) goto error_exit;

  if(!(cfg->cachedb_secret = strdup("default"))) goto error_exit;

  cfg->cachedb_no_store = 0;

  cfg->cachedb_check_when_serve_expired = 1;

#ifdef USE_REDIS

  if(!(cfg->redis_server_host = strdup("127.0.0.1"))) goto error_exit;

  if(!(cfg->redis_replica_server_host = strdup(""))) goto error_exit;

  cfg->redis_server_path = NULL;

  cfg->redis_replica_server_path = NULL;

  cfg->redis_server_password = NULL;

  cfg->redis_replica_server_password = NULL;

  cfg->redis_timeout = 100;

  cfg->redis_replica_timeout = 100;

  cfg->redis_command_timeout = 0;

  cfg->redis_replica_command_timeout = 0;

  cfg->redis_connect_timeout = 0;

  cfg->redis_replica_connect_timeout = 0;

  cfg->redis_server_port = 6379;

  cfg->redis_replica_server_port = 6379;

  cfg->redis_expire_records = 0;

  cfg->redis_logical_db = 0;

  cfg->redis_replica_logical_db = 0;

#endif  /* USE_REDIS */

#endif  /* USE_CACHEDB */

#ifdef USE_IPSET

  cfg->ipset_name_v4 = NULL;

  cfg->ipset_name_v6 = NULL;

#endif

  cfg->ede = 0;

  cfg->ede_serve_expired = 0;

  cfg->dns_error_reporting = 0;

  cfg->iter_scrub_ns = 20;

  cfg->iter_scrub_cname = 11;

  cfg->iter_scrub_promiscuous = 1;

  cfg->max_global_quota = 200;

  return cfg;

error_exit:

  config_delete(cfg);

  return NULL;

}

struct config_file* config_create_forlib(void)

{

  struct config_file* cfg = config_create();

  if(!cfg) return NULL;

  /* modifications for library use, less verbose, less memory */

  free(cfg->chrootdir);

  cfg->chrootdir = NULL;

  cfg->verbosity = 0;

  cfg->outgoing_num_ports = 16; /* in library use, this is 'reasonable'

    and probably within the ulimit(maxfds) of the user */

  cfg->outgoing_num_tcp = 2;

  cfg->msg_cache_size = 1024*1024;

  cfg->msg_cache_slabs = 1;

  cfg->rrset_cache_size = 1024*1024;

  cfg->rrset_cache_slabs = 1;

  cfg->infra_cache_slabs = 1;

  cfg->use_syslog = 0;

  cfg->key_cache_size = 1024*1024;

  cfg->key_cache_slabs = 1;

  cfg->neg_cache_size = 100 * 1024;

  cfg->donotquery_localhost = 0; /* allow, so that you can ask a

    forward nameserver running on localhost */

  cfg->val_log_level = 2; /* to fill why_bogus with */

  cfg->val_log_squelch = 1;

  cfg->minimal_responses = 0;

  cfg->harden_short_bufsize = 1;

  /* Need to explicitly define the slabs from their 0 default value */

  cfg->ip_ratelimit_slabs = 1;

  cfg->ratelimit_slabs = 1;

  cfg->dnscrypt_shared_secret_cache_slabs = 1;

  cfg->dnscrypt_nonce_cache_slabs = 1;

  return cfg;

}

/** check that the value passed is >= 0 */

#define IS_NUMBER_OR_ZERO \

  if(atoi(val) == 0 && strcmp(val, "0") != 0) return 0

/** check that the value passed is > 0 */

#define IS_NONZERO_NUMBER \

  if(atoi(val) == 0) return 0

/** check that the value passed is not 0 and a power of 2 */

#define IS_POW2_NUMBER \

  if(atoi(val) == 0 || !is_pow2((size_t)atoi(val))) return 0

/** check that the value passed is yes or no */

#define IS_YES_OR_NO \

  if(strcmp(val, "yes") != 0 && strcmp(val, "no") != 0) return 0

/** put integer_or_zero into variable */

#define S_NUMBER_OR_ZERO(str, var) if(strcmp(opt, str) == 0) \

  { IS_NUMBER_OR_ZERO; cfg->var = atoi(val); }

/** put integer_nonzero into variable */

#define S_NUMBER_NONZERO(str, var) if(strcmp(opt, str) == 0) \

  { IS_NONZERO_NUMBER; cfg->var = atoi(val); }

/** put integer_or_zero into unsigned */

#define S_UNSIGNED_OR_ZERO(str, var) if(strcmp(opt, str) == 0) \

  { IS_NUMBER_OR_ZERO; cfg->var = (unsigned)atoi(val); }

/** put integer_or_zero into size_t */

#define S_SIZET_OR_ZERO(str, var) if(strcmp(opt, str) == 0) \

  { IS_NUMBER_OR_ZERO; cfg->var = (size_t)atoi(val); }

/** put integer_nonzero into size_t */

#define S_SIZET_NONZERO(str, var) if(strcmp(opt, str) == 0) \

  { IS_NONZERO_NUMBER; cfg->var = (size_t)atoi(val); }

/** put yesno into variable */

#define S_YNO(str, var) if(strcmp(opt, str) == 0) \

  { IS_YES_OR_NO; cfg->var = (strcmp(val, "yes") == 0); }

/** put memsize into variable */

#define S_MEMSIZE(str, var) if(strcmp(opt, str)==0) \

  { return cfg_parse_memsize(val, &cfg->var); }

/** put pow2 number into variable */

#define S_POW2(str, var) if(strcmp(opt, str)==0) \

  { IS_POW2_NUMBER; cfg->var = (size_t)atoi(val); }

/** put string into variable */

#define S_STR(str, var) if(strcmp(opt, str)==0) \

  { free(cfg->var); return (cfg->var = strdup(val)) != NULL; }

/** put string into strlist */

#define S_STRLIST(str, var) if(strcmp(opt, str)==0) \

  { return cfg_strlist_insert(&cfg->var, strdup(val)); }

/** put string into strlist if not present yet*/

#define S_STRLIST_UNIQ(str, var) if(strcmp(opt, str)==0) \

  { if(cfg_strlist_find(cfg->var, val)) { return 0;} \

    return cfg_strlist_insert(&cfg->var, strdup(val)); }

/** append string to strlist */

#define S_STRLIST_APPEND(str, var) if(strcmp(opt, str)==0) \

  { return cfg_strlist_append(&cfg->var, strdup(val)); }

/** Set PROBE_MAXRTO based on current RTT_MAX_TIMEOUT

 *  (USEFUL_SERVER_TOP_TIMEOUT) configuration. */

static int

probe_maxrto(int useful_server_top_timeout) {

  return

  PROBE_MAXRTO > useful_server_top_timeout

    ?useful_server_top_timeout

    :PROBE_MAXRTO_DEFAULT;

}

/** Apply the relevant changes that rely upon RTT_MAX_TIMEOUT */

int config_apply_max_rtt(int max_rtt)

{

  USEFUL_SERVER_TOP_TIMEOUT = max_rtt;

  BLACKLIST_PENALTY = max_rtt*4;

  PROBE_MAXRTO = probe_maxrto(max_rtt);

  return max_rtt;

}

int config_set_option(struct config_file* cfg, const char* opt,

  const char* val)

{

  char buf[64];

  if(!opt) return 0;

  if(opt[strlen(opt)-1] != ':' && strlen(opt)+2<sizeof(buf)) {

    snprintf(buf, sizeof(buf), "%s:", opt);

    opt = buf;

  }

  S_NUMBER_OR_ZERO("verbosity:", verbosity)

  else if(strcmp(opt, "statistics-interval:") == 0) {

    if(strcmp(val, "0") == 0 || strcmp(val, "") == 0)

      cfg->stat_interval = 0;

    else if(atoi(val) == 0)

      return 0;

    else cfg->stat_interval = atoi(val);

  } else if(strcmp(opt, "num-threads:") == 0) {

    /* not supported, library must have 1 thread in bgworker */

    return 0;

  } else if(strcmp(opt, "outgoing-port-permit:") == 0) {

    return cfg_mark_ports(val, 1,

      cfg->outgoing_avail_ports, 65536);

  } else if(strcmp(opt, "outgoing-port-avoid:") == 0) {

    return cfg_mark_ports(val, 0,

      cfg->outgoing_avail_ports, 65536);

  } else if(strcmp(opt, "local-zone:") == 0) {

    return cfg_parse_local_zone(cfg, val);

  } else if(strcmp(opt, "val-override-date:") == 0) {

    if(strcmp(val, "") == 0 || strcmp(val, "0") == 0) {

      cfg->val_date_override = 0;

    } else if(strlen(val) == 14) {

      cfg->val_date_override = cfg_convert_timeval(val);

      return cfg->val_date_override != 0;

    } else {

      if(atoi(val) == 0) return 0;

      cfg->val_date_override = (uint32_t)atoi(val);

    }

  } else if(strcmp(opt, "local-data-ptr:") == 0) {

    char* ptr = cfg_ptr_reverse((char*)opt);

    return cfg_strlist_insert(&cfg->local_data, ptr);

  } else if(strcmp(opt, "logfile:") == 0) {

    cfg->use_syslog = 0;

    free(cfg->logfile);

    return (cfg->logfile = strdup(val)) != NULL;

  }

  else if(strcmp(opt, "log-time-ascii:") == 0)

  { IS_YES_OR_NO; cfg->log_time_ascii = (strcmp(val, "yes") == 0);

    log_set_time_asc(cfg->log_time_ascii); }

  else if(strcmp(opt, "log-time-iso:") == 0)

  { IS_YES_OR_NO; cfg->log_time_iso = (strcmp(val, "yes") == 0);

    log_set_time_iso(cfg->log_time_iso); }

  else S_SIZET_NONZERO("max-udp-size:", max_udp_size)

  else S_YNO("use-syslog:", use_syslog)

  else S_STR("log-identity:", log_identity)

  else S_YNO("extended-statistics:", stat_extended)

  else S_YNO("statistics-inhibit-zero:", stat_inhibit_zero)

  else S_YNO("statistics-cumulative:", stat_cumulative)

  else S_YNO("shm-enable:", shm_enable)

  else S_NUMBER_OR_ZERO("shm-key:", shm_key)

  else S_YNO("do-ip4:", do_ip4)

  else S_YNO("do-ip6:", do_ip6)

  else S_YNO("do-udp:", do_udp)

  else S_YNO("do-tcp:", do_tcp)

  else S_YNO("prefer-ip4:", prefer_ip4)

  else S_YNO("prefer-ip6:", prefer_ip6)

  else S_YNO("tcp-upstream:", tcp_upstream)

  else S_YNO("udp-upstream-without-downstream:",

    udp_upstream_without_downstream)

  else S_NUMBER_NONZERO("tcp-mss:", tcp_mss)

  else S_NUMBER_NONZERO("outgoing-tcp-mss:", outgoing_tcp_mss)

  else S_NUMBER_NONZERO("tcp-auth-query-timeout:", tcp_auth_query_timeout)

  else S_NUMBER_NONZERO("tcp-idle-timeout:", tcp_idle_timeout)

  else S_NUMBER_NONZERO("max-reuse-tcp-queries:", max_reuse_tcp_queries)

  else S_NUMBER_NONZERO("tcp-reuse-timeout:", tcp_reuse_timeout)

  else S_YNO("edns-tcp-keepalive:", do_tcp_keepalive)

  else S_NUMBER_NONZERO("edns-tcp-keepalive-timeout:", tcp_keepalive_timeout)

  else S_NUMBER_OR_ZERO("sock-queue-timeout:", sock_queue_timeout)

  else S_YNO("ssl-upstream:", ssl_upstream)

  else S_YNO("tls-upstream:", ssl_upstream)

  else S_STR("ssl-service-key:", ssl_service_key)

  else S_STR("tls-service-key:", ssl_service_key)

  else S_STR("ssl-service-pem:", ssl_service_pem)

  else S_STR("tls-service-pem:", ssl_service_pem)

  else S_NUMBER_NONZERO("ssl-port:", ssl_port)

  else S_NUMBER_NONZERO("tls-port:", ssl_port)

  else S_STR("ssl-cert-bundle:", tls_cert_bundle)

  else S_STR("tls-cert-bundle:", tls_cert_bundle)

  else S_YNO("tls-win-cert:", tls_win_cert)

  else S_YNO("tls-system-cert:", tls_win_cert)

  else S_STRLIST("additional-ssl-port:", tls_additional_port)

  else S_STRLIST("additional-tls-port:", tls_additional_port)

  else S_STRLIST("tls-additional-ports:", tls_additional_port)

  else S_STRLIST("tls-additional-port:", tls_additional_port)

  else S_STRLIST_APPEND("tls-session-ticket-keys:", tls_session_ticket_keys)

  else S_STR("tls-ciphers:", tls_ciphers)

  else S_STR("tls-ciphersuites:", tls_ciphersuites)

  else S_YNO("tls-use-sni:", tls_use_sni)

  else S_YNO("tls-use-system-policy-versions:", tls_use_system_policy_versions)

  else S_NUMBER_NONZERO("https-port:", https_port)

  else S_STR("http-endpoint:", http_endpoint)

  else S_NUMBER_NONZERO("http-max-streams:", http_max_streams)

  else S_MEMSIZE("http-query-buffer-size:", http_query_buffer_size)

  else S_MEMSIZE("http-response-buffer-size:", http_response_buffer_size)

  else S_YNO("http-nodelay:", http_nodelay)

  else S_YNO("http-notls-downstream:", http_notls_downstream)

  else S_NUMBER_NONZERO("quic-port:", quic_port)

  else S_MEMSIZE("quic-size:", quic_size)

  else S_YNO("interface-automatic:", if_automatic)

  else S_STR("interface-automatic-ports:", if_automatic_ports)

  else S_YNO("use-systemd:", use_systemd)

  else S_YNO("do-daemonize:", do_daemonize)

  else S_NUMBER_NONZERO("port:", port)

  else S_NUMBER_NONZERO("outgoing-range:", outgoing_num_ports)

  else S_SIZET_OR_ZERO("outgoing-num-tcp:", outgoing_num_tcp)

  else S_SIZET_OR_ZERO("incoming-num-tcp:", incoming_num_tcp)

  else S_MEMSIZE("stream-wait-size:", stream_wait_size)

  else S_SIZET_NONZERO("edns-buffer-size:", edns_buffer_size)

  else S_SIZET_NONZERO("msg-buffer-size:", msg_buffer_size)

  else S_MEMSIZE("msg-cache-size:", msg_cache_size)

  else S_POW2("msg-cache-slabs:", msg_cache_slabs)

  else S_SIZET_NONZERO("num-queries-per-thread:",num_queries_per_thread)

  else S_SIZET_OR_ZERO("jostle-timeout:", jostle_time)

  else S_MEMSIZE("so-rcvbuf:", so_rcvbuf)

  else S_MEMSIZE("so-sndbuf:", so_sndbuf)

  else S_YNO("so-reuseport:", so_reuseport)

  else S_YNO("ip-transparent:", ip_transparent)

  else S_YNO("ip-freebind:", ip_freebind)

  else S_NUMBER_OR_ZERO("ip-dscp:", ip_dscp)

  else S_MEMSIZE("rrset-cache-size:", rrset_cache_size)

  else S_POW2("rrset-cache-slabs:", rrset_cache_slabs)

  else S_YNO("prefetch:", prefetch)

  else S_YNO("prefetch-key:", prefetch_key)

  else S_YNO("deny-any:", deny_any)

  else if(strcmp(opt, "cache-max-ttl:") == 0)

  { IS_NUMBER_OR_ZERO; cfg->max_ttl = atoi(val); MAX_TTL=(time_t)cfg->max_ttl;}

  else if(strcmp(opt, "cache-max-negative-ttl:") == 0)

  { IS_NUMBER_OR_ZERO; cfg->max_negative_ttl = atoi(val); MAX_NEG_TTL=(time_t)cfg->max_negative_ttl;}

  else if(strcmp(opt, "cache-min-negative-ttl:") == 0)

  { IS_NUMBER_OR_ZERO; cfg->min_negative_ttl = atoi(val); MIN_NEG_TTL=(time_t)cfg->min_negative_ttl;}

  else if(strcmp(opt, "cache-min-ttl:") == 0)

  { IS_NUMBER_OR_ZERO; cfg->min_ttl = atoi(val); MIN_TTL=(time_t)cfg->min_ttl;}

  else if(strcmp(opt, "infra-cache-min-rtt:") == 0) {

    IS_NUMBER_OR_ZERO; cfg->infra_cache_min_rtt = atoi(val);

    RTT_MIN_TIMEOUT=cfg->infra_cache_min_rtt;

  }

  else if(strcmp(opt, "infra-cache-max-rtt:") == 0) {

    IS_NUMBER_OR_ZERO; cfg->infra_cache_max_rtt = atoi(val);

    RTT_MAX_TIMEOUT=config_apply_max_rtt(cfg->infra_cache_max_rtt);

  }

  else S_YNO("infra-keep-probing:", infra_keep_probing)

  else S_NUMBER_OR_ZERO("infra-host-ttl:", host_ttl)

  else S_POW2("infra-cache-slabs:", infra_cache_slabs)

  else S_SIZET_NONZERO("infra-cache-numhosts:", infra_cache_numhosts)

  else S_NUMBER_OR_ZERO("delay-close:", delay_close)

  else S_YNO("udp-connect:", udp_connect)

  else S_STR("chroot:", chrootdir)

  else S_STR("username:", username)

  else S_STR("directory:", directory)

  else S_STR("pidfile:", pidfile)

  else S_YNO("hide-identity:", hide_identity)

  else S_YNO("hide-version:", hide_version)

  else S_YNO("hide-trustanchor:", hide_trustanchor)

  else S_YNO("hide-http-user-agent:", hide_http_user_agent)

  else S_STR("identity:", identity)

  else S_STR("version:", version)

  else S_STR("http-user-agent:", http_user_agent)

  else if(strcmp(opt, "nsid:") == 0) {

    free(cfg->nsid_cfg_str);

    if (!(cfg->nsid_cfg_str = strdup(val)))

      return 0;

    /* Empty string is just validly unsetting nsid */

    if (*val == 0) {

      free(cfg->nsid);

      cfg->nsid = NULL;

      cfg->nsid_len = 0;

      return 1;

    }

    cfg->nsid = cfg_parse_nsid(val, &cfg->nsid_len);

    return cfg->nsid != NULL;

  }

  else S_STRLIST("root-hints:", root_hints)

  else S_STR("target-fetch-policy:", target_fetch_policy)

  else S_YNO("harden-glue:", harden_glue)

  else S_YNO("harden-unverified-glue:", harden_unverified_glue)

  else S_YNO("harden-short-bufsize:", harden_short_bufsize)

  else S_YNO("harden-large-queries:", harden_large_queries)

  else S_YNO("harden-dnssec-stripped:", harden_dnssec_stripped)

  else S_YNO("harden-below-nxdomain:", harden_below_nxdomain)

  else S_YNO("harden-referral-path:", harden_referral_path)

  else S_YNO("harden-algo-downgrade:", harden_algo_downgrade)

  else S_YNO("harden-unknown-additional:", harden_unknown_additional)

  else S_YNO("use-caps-for-id:", use_caps_bits_for_id)

  else S_STRLIST("caps-whitelist:", caps_whitelist)

  else S_SIZET_OR_ZERO("unwanted-reply-threshold:", unwanted_threshold)

  else S_STRLIST("private-address:", private_address)

  else S_STRLIST("private-domain:", private_domain)

  else S_YNO("do-not-query-localhost:", donotquery_localhost)

  else S_STRLIST("do-not-query-address:", donotqueryaddrs)

  else S_STRLIST("auto-trust-anchor-file:", auto_trust_anchor_file_list)

  else S_STRLIST("trust-anchor-file:", trust_anchor_file_list)

  else S_STRLIST("trust-anchor:", trust_anchor_list)

  else S_STRLIST("trusted-keys-file:", trusted_keys_file_list)

  else S_YNO("trust-anchor-signaling:", trust_anchor_signaling)

  else S_YNO("root-key-sentinel:", root_key_sentinel)

  else S_STRLIST("domain-insecure:", domain_insecure)

  else S_NUMBER_OR_ZERO("val-bogus-ttl:", bogus_ttl)

  else S_YNO("val-clean-additional:", val_clean_additional)

  else S_NUMBER_OR_ZERO("val-log-level:", val_log_level)

  else S_YNO("val-log-squelch:", val_log_squelch)

  else S_YNO("log-queries:", log_queries)

  else S_YNO("log-replies:", log_replies)

  else S_YNO("log-tag-queryreply:", log_tag_queryreply)

  else S_YNO("log-local-actions:", log_local_actions)

  else S_YNO("log-servfail:", log_servfail)

  else S_YNO("log-destaddr:", log_destaddr)

  else S_YNO("log-thread-id:", log_thread_id)

  else S_YNO("val-permissive-mode:", val_permissive_mode)

  else S_YNO("aggressive-nsec:", aggressive_nsec)

  else S_YNO("ignore-cd-flag:", ignore_cd)

  else S_YNO("disable-edns-do:", disable_edns_do)

  else if(strcmp(opt, "serve-expired:") == 0)

  { IS_YES_OR_NO; cfg->serve_expired = (strcmp(val, "yes") == 0);

    SERVE_EXPIRED = cfg->serve_expired; }

  else if(strcmp(opt, "serve-expired-ttl:") == 0)

  { IS_NUMBER_OR_ZERO; cfg->serve_expired_ttl = atoi(val); SERVE_EXPIRED_TTL=(time_t)cfg->serve_expired_ttl;}

  else if(strcmp(opt, "serve-expired-ttl-reset:") == 0)

  { IS_YES_OR_NO; cfg->serve_expired_ttl_reset = (strcmp(val, "yes") == 0);

    SERVE_EXPIRED_TTL_RESET = cfg->serve_expired_ttl_reset; }

  else if(strcmp(opt, "serve-expired-reply-ttl:") == 0)

  { IS_NUMBER_OR_ZERO; cfg->serve_expired_reply_ttl = atoi(val); SERVE_EXPIRED_REPLY_TTL=(time_t)cfg->serve_expired_reply_ttl;}

  else S_NUMBER_OR_ZERO("serve-expired-client-timeout:", serve_expired_client_timeout)

  else S_YNO("ede:", ede)

  else S_YNO("ede-serve-expired:", ede_serve_expired)

  else S_YNO("dns-error-reporting:", dns_error_reporting)

  else S_NUMBER_OR_ZERO("iter-scrub-ns:", iter_scrub_ns)

  else S_NUMBER_OR_ZERO("iter-scrub-cname:", iter_scrub_cname)

  else S_YNO("iter-scrub-promiscuous:", iter_scrub_promiscuous)

  else S_NUMBER_OR_ZERO("max-global-quota:", max_global_quota)

  else S_YNO("serve-original-ttl:", serve_original_ttl)

  else S_STR("val-nsec3-keysize-iterations:", val_nsec3_key_iterations)

  else S_YNO("zonemd-permissive-mode:", zonemd_permissive_mode)

  else S_UNSIGNED_OR_ZERO("add-holddown:", add_holddown)

  else S_UNSIGNED_OR_ZERO("del-holddown:", del_holddown)

  else S_UNSIGNED_OR_ZERO("keep-missing:", keep_missing)

  else if(strcmp(opt, "permit-small-holddown:") == 0)

  { IS_YES_OR_NO; cfg->permit_small_holddown = (strcmp(val, "yes") == 0);

    autr_permit_small_holddown = cfg->permit_small_holddown; }

  else S_MEMSIZE("key-cache-size:", key_cache_size)

  else S_POW2("key-cache-slabs:", key_cache_slabs)

  else S_MEMSIZE("neg-cache-size:", neg_cache_size)

  else S_YNO("minimal-responses:", minimal_responses)

  else S_YNO("rrset-roundrobin:", rrset_roundrobin)

  else S_NUMBER_OR_ZERO("unknown-server-time-limit:", unknown_server_time_limit)

  else S_NUMBER_OR_ZERO("discard-timeout:", discard_timeout)

  else S_NUMBER_OR_ZERO("wait-limit:", wait_limit)

  else S_NUMBER_OR_ZERO("wait-limit-cookie:", wait_limit_cookie)

  else S_STRLIST("local-data:", local_data)

  else S_YNO("unblock-lan-zones:", unblock_lan_zones)

  else S_YNO("insecure-lan-zones:", insecure_lan_zones)

  else S_YNO("control-enable:", remote_control_enable)

  else S_STRLIST_APPEND("control-interface:", control_ifs)

  else S_NUMBER_NONZERO("control-port:", control_port)

  else S_STR("server-key-file:", server_key_file)

  else S_STR("server-cert-file:", server_cert_file)

  else S_STR("control-key-file:", control_key_file)

  else S_STR("control-cert-file:", control_cert_file)

  else S_STR("module-config:", module_conf)

  else S_STRLIST("python-script:", python_script)

  else S_STRLIST("dynlib-file:", dynlib_file)

  else S_YNO("disable-dnssec-lame-check:", disable_dnssec_lame_check)

#ifdef CLIENT_SUBNET

  /* Can't set max subnet prefix here, since that value is used when

   * generating the address tree. */

  /* No client-subnet-always-forward here, module registration depends on

   * this option. */

#endif

#ifdef USE_DNSTAP

  else S_YNO("dnstap-enable:", dnstap)

  else S_YNO("dnstap-bidirectional:", dnstap_bidirectional)

  else S_STR("dnstap-socket-path:", dnstap_socket_path)

  else S_STR("dnstap-ip:", dnstap_ip)

  else S_YNO("dnstap-tls:", dnstap_tls)

  else S_STR("dnstap-tls-server-name:", dnstap_tls_server_name)

  else S_STR("dnstap-tls-cert-bundle:", dnstap_tls_cert_bundle)

  else S_STR("dnstap-tls-client-key-file:", dnstap_tls_client_key_file)

  else S_STR("dnstap-tls-client-cert-file:",

    dnstap_tls_client_cert_file)

  else S_YNO("dnstap-send-identity:", dnstap_send_identity)

  else S_YNO("dnstap-send-version:", dnstap_send_version)

  else S_STR("dnstap-identity:", dnstap_identity)

  else S_STR("dnstap-version:", dnstap_version)

  else S_NUMBER_OR_ZERO("dnstap-sample-rate:", dnstap_sample_rate)

  else S_YNO("dnstap-log-resolver-query-messages:",

    dnstap_log_resolver_query_messages)

  else S_YNO("dnstap-log-resolver-response-messages:",

    dnstap_log_resolver_response_messages)

  else S_YNO("dnstap-log-client-query-messages:",

    dnstap_log_client_query_messages)

  else S_YNO("dnstap-log-client-response-messages:",

    dnstap_log_client_response_messages)

  else S_YNO("dnstap-log-forwarder-query-messages:",

    dnstap_log_forwarder_query_messages)

  else S_YNO("dnstap-log-forwarder-response-messages:",

    dnstap_log_forwarder_response_messages)

#endif

#ifdef USE_DNSCRYPT

  else S_YNO("dnscrypt-enable:", dnscrypt)

  else S_NUMBER_NONZERO("dnscrypt-port:", dnscrypt_port)

  else S_STR("dnscrypt-provider:", dnscrypt_provider)

  else S_STRLIST_UNIQ("dnscrypt-provider-cert:", dnscrypt_provider_cert)

  else S_STRLIST("dnscrypt-provider-cert-rotated:", dnscrypt_provider_cert_rotated)

  else S_STRLIST_UNIQ("dnscrypt-secret-key:", dnscrypt_secret_key)

  else S_MEMSIZE("dnscrypt-shared-secret-cache-size:",

    dnscrypt_shared_secret_cache_size)

  else S_POW2("dnscrypt-shared-secret-cache-slabs:",

    dnscrypt_shared_secret_cache_slabs)