X-Git-Url: http://git.pk910.de/?p=ircu2.10.12-pk.git;a=blobdiff_plain;f=ircd%2Fs_conf.c;fp=ircd%2Fs_conf.c;h=7db9ff2e4722e68136e3532d6cc7cc5446b475df;hp=0000000000000000000000000000000000000000;hb=0400a5a6479398d82526785c18c0df8bc8b92dce;hpb=d17e10da972ce5776c60b4c317267c6abe0e1ead

diff --git a/ircd/s_conf.c b/ircd/s_conf.c
new file mode 100644
index 0000000..7db9ff2
--- /dev/null
+++ b/ircd/s_conf.c
@@ -0,0 +1,1186 @@
+/*
+ * IRC - Internet Relay Chat, ircd/s_conf.c
+ * Copyright (C) 1990 Jarkko Oikarinen and
+ *                    University of Oulu, Computing Center
+ *
+ * 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 1, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/** @file
+ * @brief ircd configuration file driver
+ * @version $Id$
+ */
+#include "config.h"
+
+#include "s_conf.h"
+#include "IPcheck.h"
+#include "class.h"
+#include "client.h"
+#include "crule.h"
+#include "ircd_features.h"
+#include "fileio.h"
+#include "gline.h"
+#include "hash.h"
+#include "ircd.h"
+#include "ircd_alloc.h"
+#include "ircd_chattr.h"
+#include "ircd_log.h"
+#include "ircd_reply.h"
+#include "ircd_snprintf.h"
+#include "ircd_string.h"
+#include "list.h"
+#include "listener.h"
+#include "match.h"
+#include "motd.h"
+#include "numeric.h"
+#include "numnicks.h"
+#include "opercmds.h"
+#include "parse.h"
+#include "res.h"
+#include "s_auth.h"
+#include "s_bsd.h"
+#include "s_debug.h"
+#include "s_misc.h"
+#include "send.h"
+#include "struct.h"
+#include "sys.h"
+
+/* #include <assert.h> -- Now using assert in ircd_log.h */
+#include <errno.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+/** Global list of all ConfItem structures. */
+struct ConfItem  *GlobalConfList;
+/** Count of items in #GlobalConfList. */
+int              GlobalConfCount;
+/** Global list of service mappings. */
+struct s_map     *GlobalServiceMapList;
+/** Global list of channel quarantines. */
+struct qline     *GlobalQuarantineList;
+
+/** Current line number in scanner input. */
+int lineno;
+
+/** Configuration information for #me. */
+struct LocalConf   localConf;
+/** Global list of connection rules. */
+struct CRuleConf*  cruleConfList;
+/** Global list of K-lines. */
+struct DenyConf*   denyConfList;
+
+/** Tell a user that they are banned, dumping the message from a file.
+ * @param sptr Client being rejected
+ * @param filename Send this file's contents to \a sptr
+ */
+static void killcomment(struct Client* sptr, const char* filename)
+{
+  FBFILE*     file = 0;
+  char        line[80];
+  struct stat sb;
+
+  if (NULL == (file = fbopen(filename, "r"))) {
+    send_reply(sptr, ERR_NOMOTD);
+    send_reply(sptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
+               ":Connection from your host is refused on this server.");
+    return;
+  }
+  fbstat(&sb, file);
+  while (fbgets(line, sizeof(line) - 1, file)) {
+    char* end = line + strlen(line);
+    while (end > line) {
+      --end;
+      if ('\n' == *end || '\r' == *end)
+        *end = '\0';
+      else
+        break;
+    }
+    send_reply(sptr, RPL_MOTD, line);
+  }
+  send_reply(sptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
+             ":Connection from your host is refused on this server.");
+  fbclose(file);
+}
+
+/** Allocate a new struct ConfItem and link it to #GlobalConfList.
+ * @return Newly allocated structure.
+ */
+struct ConfItem* make_conf(int type)
+{
+  struct ConfItem* aconf;
+
+  aconf = (struct ConfItem*) MyMalloc(sizeof(struct ConfItem));
+  assert(0 != aconf);
+  ++GlobalConfCount;
+  memset(aconf, 0, sizeof(struct ConfItem));
+  aconf->status  = type;
+  aconf->next    = GlobalConfList;
+  GlobalConfList = aconf;
+  return aconf;
+}
+
+/** Free a struct ConfItem and any resources it owns.
+ * @param aconf Item to free.
+ */
+void free_conf(struct ConfItem *aconf)
+{
+  Debug((DEBUG_DEBUG, "free_conf: %s %s %d",
+         aconf->host ? aconf->host : "*",
+         aconf->name ? aconf->name : "*",
+         aconf->address.port));
+  if (aconf->dns_pending)
+    delete_resolver_queries(aconf);
+  MyFree(aconf->username);
+  MyFree(aconf->host);
+  MyFree(aconf->origin_name);
+  if (aconf->passwd)
+    memset(aconf->passwd, 0, strlen(aconf->passwd));
+  MyFree(aconf->passwd);
+  MyFree(aconf->name);
+  MyFree(aconf->hub_limit);
+  MyFree(aconf);
+  --GlobalConfCount;
+}
+
+/** Disassociate configuration from the client.
+ * @param cptr Client to operate on.
+ * @param aconf ConfItem to detach.
+ */
+static void detach_conf(struct Client* cptr, struct ConfItem* aconf)
+{
+  struct SLink** lp;
+  struct SLink*  tmp;
+
+  assert(0 != aconf);
+  assert(0 != cptr);
+  assert(0 < aconf->clients);
+
+  lp = &(cli_confs(cptr));
+
+  while (*lp) {
+    if ((*lp)->value.aconf == aconf) {
+      if (aconf->conn_class && (aconf->status & CONF_CLIENT_MASK) && ConfLinks(aconf) > 0)
+        --ConfLinks(aconf);
+
+      assert(0 < aconf->clients);
+      if (0 == --aconf->clients && IsIllegal(aconf))
+        free_conf(aconf);
+      tmp = *lp;
+      *lp = tmp->next;
+      free_link(tmp);
+      return;
+    }
+    lp = &((*lp)->next);
+  }
+}
+
+/** Parse a user\@host mask into username and host or IP parts.
+ * If \a host contains no username part, set \a aconf->username to
+ * NULL.  If the host part of \a host looks like an IP mask, set \a
+ * aconf->addrbits and \a aconf->address to match.  Otherwise, set
+ * \a aconf->host, and set \a aconf->addrbits to -1.
+ * @param[in,out] aconf Configuration item to set.
+ * @param[in] host user\@host mask to parse.
+ */
+void conf_parse_userhost(struct ConfItem *aconf, char *host)
+{
+  char *host_part;
+  unsigned char addrbits;
+
+  MyFree(aconf->username);
+  MyFree(aconf->host);
+  host_part = strchr(host, '@');
+  if (host_part) {
+    *host_part = '\0';
+    DupString(aconf->username, host);
+    host_part++;
+  } else {
+    aconf->username = NULL;
+    host_part = host;
+  }
+  DupString(aconf->host, host_part);
+  if (ipmask_parse(aconf->host, &aconf->address.addr, &addrbits))
+    aconf->addrbits = addrbits;
+  else
+    aconf->addrbits = -1;
+}
+
+/** Copies a completed DNS query into its ConfItem.
+ * @param vptr Pointer to struct ConfItem for the block.
+ * @param hp DNS reply, or NULL if the lookup failed.
+ */
+static void conf_dns_callback(void* vptr, const struct irc_in_addr *addr, const char *h_name)
+{
+  struct ConfItem* aconf = (struct ConfItem*) vptr;
+  assert(aconf);
+  aconf->dns_pending = 0;
+  if (addr)
+    memcpy(&aconf->address.addr, addr, sizeof(aconf->address.addr));
+}
+
+/** Start a nameserver lookup of the conf host.  If the conf entry is
+ * currently doing a lookup, do nothing.
+ * @param aconf ConfItem for which to start a request.
+ */
+static void conf_dns_lookup(struct ConfItem* aconf)
+{
+  if (!aconf->dns_pending) {
+    char            buf[HOSTLEN + 1];
+
+    host_from_uh(buf, aconf->host, HOSTLEN);
+    gethost_byname(buf, conf_dns_callback, aconf);
+    aconf->dns_pending = 1;
+  }
+}
+
+
+/** Start lookups of all addresses in the conf line.  The origin must
+ * be a numeric IP address.  If the remote host field is not an IP
+ * address, start a DNS lookup for it.
+ * @param aconf Connection to do lookups for.
+ */
+void
+lookup_confhost(struct ConfItem *aconf)
+{
+  if (EmptyString(aconf->host) || EmptyString(aconf->name)) {
+    Debug((DEBUG_ERROR, "Host/server name error: (%s) (%s)",
+           aconf->host, aconf->name));
+    return;
+  }
+  if (aconf->origin_name
+      && !ircd_aton(&aconf->origin.addr, aconf->origin_name)) {
+    Debug((DEBUG_ERROR, "Origin name error: (%s) (%s)",
+        aconf->origin_name, aconf->name));
+  }
+  /*
+   * Do name lookup now on hostnames given and store the
+   * ip numbers in conf structure.
+   */
+  if (IsIP6Char(*aconf->host)) {
+    if (!ircd_aton(&aconf->address.addr, aconf->host)) {
+      Debug((DEBUG_ERROR, "Host/server name error: (%s) (%s)",
+          aconf->host, aconf->name));
+    }
+  }
+  else
+    conf_dns_lookup(aconf);
+}
+
+/** Find a server by name or hostname.
+ * @param name Server name to find.
+ * @return Pointer to the corresponding ConfItem, or NULL if none exists.
+ */
+struct ConfItem* conf_find_server(const char* name)
+{
+  struct ConfItem* conf;
+  assert(0 != name);
+
+  for (conf = GlobalConfList; conf; conf = conf->next) {
+    if (CONF_SERVER == conf->status) {
+      /*
+       * Check first servernames, then try hostnames.
+       * XXX - match returns 0 if there _is_ a match... guess they
+       * haven't decided what true is yet
+       */
+      if (0 == match(name, conf->name))
+        return conf;
+    }
+  }
+  return 0;
+}
+
+/** Evaluate connection rules.
+ * @param name Name of server to check
+ * @param mask Filter for CRule types (only consider if type & \a mask != 0).
+ * @return Name of rule that forbids the connection; NULL if no prohibitions.
+ */
+const char* conf_eval_crule(const char* name, int mask)
+{
+  struct CRuleConf* p = cruleConfList;
+  assert(0 != name);
+
+  for ( ; p; p = p->next) {
+    if (0 != (p->type & mask) && 0 == match(p->hostmask, name)) {
+      if (crule_eval(p->node))
+        return p->rule;
+    }
+  }
+  return 0;
+}
+
+/** Remove all conf entries from the client except those which match
+ * the status field mask.
+ * @param cptr Client to operate on.
+ * @param mask ConfItem types to keep.
+ */
+void det_confs_butmask(struct Client* cptr, int mask)
+{
+  struct SLink* link;
+  struct SLink* next;
+  assert(0 != cptr);
+
+  for (link = cli_confs(cptr); link; link = next) {
+    next = link->next;
+    if ((link->value.aconf->status & mask) == 0)
+      detach_conf(cptr, link->value.aconf);
+  }
+}
+
+/** Find the first (best) Client block to attach.
+ * @param cptr Client for whom to check rules.
+ * @return Authorization check result.
+ */
+enum AuthorizationCheckResult attach_iline(struct Client* cptr)
+{
+  struct ConfItem* aconf;
+
+  assert(0 != cptr);
+
+  for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
+    if (aconf->status != CONF_CLIENT)
+      continue;
+    /* If you change any of this logic, please make corresponding
+     * changes in conf_debug_iline() below.
+     */
+    if (aconf->address.port && aconf->address.port != cli_listener(cptr)->addr.port)
+      continue;
+    if (aconf->username && match(aconf->username, cli_username(cptr)))
+      continue;
+    if (aconf->host && match(aconf->host, cli_sockhost(cptr)))
+      continue;
+    if ((aconf->addrbits >= 0)
+        && !ipmask_check(&cli_ip(cptr), &aconf->address.addr, aconf->addrbits))
+      continue;
+    if (IPcheck_nr(cptr) > aconf->maximum)
+      return ACR_TOO_MANY_FROM_IP;
+    if (aconf->username)
+      SetFlag(cptr, FLAG_DOID);
+    return attach_conf(cptr, aconf);
+  }
+  return ACR_NO_AUTHORIZATION;
+}
+
+/** Interpret \a client as a client specifier and show which Client
+ * block(s) match that client.
+ *
+ * The client specifier may contain an IP address, hostname, listener
+ * port, or a combination of those separated by commas.  IP addresses
+ * and hostnamese may be preceded by "username@"; the last given
+ * username will be used for the match.
+ *
+ * @param[in] client Client specifier.
+ * @return Matching Client block structure.
+ */
+struct ConfItem *conf_debug_iline(const char *client)
+{
+  struct irc_in_addr address;
+  struct ConfItem *aconf;
+  struct DenyConf *deny;
+  char *sep;
+  unsigned short listener;
+  char username[USERLEN+1], hostname[HOSTLEN+1], realname[REALLEN+1];
+
+  /* Initialize variables. */
+  listener = 0;
+  memset(&address, 0, sizeof(address));
+  memset(&username, 0, sizeof(username));
+  memset(&hostname, 0, sizeof(hostname));
+  memset(&realname, 0, sizeof(realname));
+
+  /* Parse client specifier. */
+  while (*client) {
+    struct irc_in_addr tmpaddr;
+    long tmp;
+
+    /* Try to parse as listener port number first. */
+    tmp = strtol(client, &sep, 10);
+    if (tmp && (*sep == '\0' || *sep == ',')) {
+      listener = tmp;
+      client = sep + (*sep != '\0');
+      continue;
+    }
+
+    /* Maybe username@ before an IP address or hostname? */
+    tmp = strcspn(client, ",@");
+    if (client[tmp] == '@') {
+      if (tmp > USERLEN)
+        tmp = USERLEN;
+      ircd_strncpy(username, client, tmp);
+      /* and fall through */
+      client += tmp + 1;
+    }
+
+    /* Looks like an IP address? */
+    tmp = ircd_aton(&tmpaddr, client);
+    if (tmp && (client[tmp] == '\0' || client[tmp] == ',')) {
+        memcpy(&address, &tmpaddr, sizeof(address));
+        client += tmp + (client[tmp] != '\0');
+        continue;
+    }
+
+    /* Realname? */
+    if (client[0] == '$' && client[1] == 'R') {
+      client += 2;
+      for (tmp = 0; *client != '\0' && *client != ',' && tmp < REALLEN; ++client, ++tmp) {
+        if (*client == '\\')
+          realname[tmp] = *++client;
+        else
+          realname[tmp] = *client;
+      }
+      continue;
+    }
+
+    /* Else must be a hostname. */
+    tmp = strcspn(client, ",");
+    if (tmp > HOSTLEN)
+      tmp = HOSTLEN;
+    ircd_strncpy(hostname, client, tmp);
+    client += tmp + (client[tmp] != '\0');
+  }
+
+  /* Walk configuration to find matching Client block. */
+  for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
+    if (aconf->status != CONF_CLIENT)
+      continue;
+    if (aconf->address.port && aconf->address.port != listener) {
+      fprintf(stdout, "Listener port mismatch: %u != %u\n", aconf->address.port, listener);
+      continue;
+    }
+    if (aconf->username && match(aconf->username, username)) {
+      fprintf(stdout, "Username mismatch: %s != %s\n", aconf->username, username);
+      continue;
+    }
+    if (aconf->host && match(aconf->host, hostname)) {
+      fprintf(stdout, "Hostname mismatch: %s != %s\n", aconf->host, hostname);
+      continue;
+    }
+    if ((aconf->addrbits >= 0)
+        && !ipmask_check(&address, &aconf->address.addr, aconf->addrbits)) {
+      fprintf(stdout, "IP address mismatch: %s != %s\n", aconf->name, ircd_ntoa(&address));
+      continue;
+    }
+    fprintf(stdout, "Match! username=%s host=%s ip=%s class=%s maxlinks=%u password=%s\n",
+            (aconf->username ? aconf->username : "(null)"),
+            (aconf->host ? aconf->host : "(null)"),
+            (aconf->name ? aconf->name : "(null)"),
+            ConfClass(aconf), aconf->maximum,
+            (aconf->passwd ? aconf->passwd : "(null)"));
+    break;
+  }
+
+  /* If no authorization, say so and exit. */
+  if (!aconf)
+  {
+    fprintf(stdout, "No authorization found.\n");
+    return NULL;
+  }
+
+  /* Look for a Kill block with the user's name on it. */
+  for (deny = denyConfList; deny; deny = deny->next) {
+    if (deny->usermask && match(deny->usermask, username))
+      continue;
+    if (deny->realmask && match(deny->realmask, realname))
+      continue;
+    if (deny->bits > 0) {
+      if (!ipmask_check(&address, &deny->address, deny->bits))
+        continue;
+    } else if (deny->hostmask && match(deny->hostmask, hostname))
+      continue;
+
+    /* Looks like a match; report it. */
+    fprintf(stdout, "Denied! usermask=%s realmask=\"%s\" hostmask=%s (bits=%u)\n",
+            deny->usermask ? deny->usermask : "(null)",
+            deny->realmask ? deny->realmask : "(null)",
+            deny->hostmask ? deny->hostmask : "(null)",
+            deny->bits);
+  }
+
+  return aconf;
+}
+
+/** Check whether a particular ConfItem is already attached to a
+ * Client.
+ * @param aconf ConfItem to search for
+ * @param cptr Client to check
+ * @return Non-zero if \a aconf is attached to \a cptr, zero if not.
+ */
+static int is_attached(struct ConfItem *aconf, struct Client *cptr)
+{
+  struct SLink *lp;
+
+  for (lp = cli_confs(cptr); lp; lp = lp->next) {
+    if (lp->value.aconf == aconf)
+      return 1;
+  }
+  return 0;
+}
+
+/** Associate a specific configuration entry to a *local* client (this
+ * is the one which used in accepting the connection). Note, that this
+ * automatically changes the attachment if there was an old one...
+ * @param cptr Client to attach \a aconf to
+ * @param aconf ConfItem to attach
+ * @return Authorization check result.
+ */
+enum AuthorizationCheckResult attach_conf(struct Client *cptr, struct ConfItem *aconf)
+{
+  struct SLink *lp;
+
+  if (is_attached(aconf, cptr))
+    return ACR_ALREADY_AUTHORIZED;
+  if (IsIllegal(aconf))
+    return ACR_NO_AUTHORIZATION;
+  if ((aconf->status & (CONF_OPERATOR | CONF_CLIENT)) &&
+      ConfLinks(aconf) >= ConfMaxLinks(aconf) && ConfMaxLinks(aconf) > 0)
+    return ACR_TOO_MANY_IN_CLASS;  /* Use this for printing error message */
+  lp = make_link();
+  lp->next = cli_confs(cptr);
+  lp->value.aconf = aconf;
+  cli_confs(cptr) = lp;
+  ++aconf->clients;
+  if (aconf->status & CONF_CLIENT_MASK)
+    ConfLinks(aconf)++;
+  return ACR_OK;
+}
+
+/** Return our LocalConf configuration structure.
+ * @return A pointer to #localConf.
+ */
+const struct LocalConf* conf_get_local(void)
+{
+  return &localConf;
+}
+
+/** Attach ConfItems to a client if the name passed matches that for
+ * the ConfItems or is an exact match for them.
+ * @param cptr Client getting the ConfItem attachments.
+ * @param name Filter to match ConfItem::name.
+ * @param statmask Filter to limit ConfItem::status.
+ * @return First ConfItem attached to \a cptr.
+ */
+struct ConfItem* attach_confs_byname(struct Client* cptr, const char* name,
+                                     int statmask)
+{
+  struct ConfItem* tmp;
+  struct ConfItem* first = NULL;
+
+  assert(0 != name);
+
+  if (HOSTLEN < strlen(name))
+    return 0;
+
+  for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
+    if (0 != (tmp->status & statmask) && !IsIllegal(tmp)) {
+      assert(0 != tmp->name);
+      if (0 == match(tmp->name, name) || 0 == ircd_strcmp(tmp->name, name)) { 
+        if (ACR_OK == attach_conf(cptr, tmp) && !first)
+          first = tmp;
+      }
+    }
+  }
+  return first;
+}
+
+/** Attach ConfItems to a client if the host passed matches that for
+ * the ConfItems or is an exact match for them.
+ * @param cptr Client getting the ConfItem attachments.
+ * @param host Filter to match ConfItem::host.
+ * @param statmask Filter to limit ConfItem::status.
+ * @return First ConfItem attached to \a cptr.
+ */
+struct ConfItem* attach_confs_byhost(struct Client* cptr, const char* host,
+                                     int statmask)
+{
+  struct ConfItem* tmp;
+  struct ConfItem* first = 0;
+
+  assert(0 != host);
+  if (HOSTLEN < strlen(host))
+    return 0;
+
+  for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
+    if (0 != (tmp->status & statmask) && !IsIllegal(tmp)) {
+      assert(0 != tmp->host);
+      if (0 == match(tmp->host, host) || 0 == ircd_strcmp(tmp->host, host)) { 
+        if (ACR_OK == attach_conf(cptr, tmp) && !first)
+          first = tmp;
+      }
+    }
+  }
+  return first;
+}
+
+/** Find a ConfItem that has the same name and user+host fields as
+ * specified.  Requires an exact match for \a name.
+ * @param name Name to match
+ * @param cptr Client to match against
+ * @param statmask Filter for ConfItem::status
+ * @return First found matching ConfItem.
+ */
+struct ConfItem* find_conf_exact(const char* name, struct Client *cptr, int statmask)
+{
+  struct ConfItem *tmp;
+
+  for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
+    if (!(tmp->status & statmask) || !tmp->name || !tmp->host ||
+        0 != ircd_strcmp(tmp->name, name))
+      continue;
+    if (tmp->username
+        && (EmptyString(cli_username(cptr))
+            || match(tmp->username, cli_username(cptr))))
+      continue;
+    if (tmp->addrbits < 0)
+    {
+      if (match(tmp->host, cli_sockhost(cptr)))
+        continue;
+    }
+    else if (!ipmask_check(&cli_ip(cptr), &tmp->address.addr, tmp->addrbits))
+      continue;
+    if ((tmp->status & CONF_OPERATOR)
+        && (MaxLinks(tmp->conn_class) > 0)
+        && (tmp->clients >= MaxLinks(tmp->conn_class)))
+      continue;
+    return tmp;
+  }
+  return 0;
+}
+
+/** Find a ConfItem from a list that has a name that matches \a name.
+ * @param lp List to search in.
+ * @param name Filter for ConfItem::name field; matches either exactly
+ * or as a glob.
+ * @param statmask Filter for ConfItem::status.
+ * @return First matching ConfItem from \a lp.
+ */
+struct ConfItem* find_conf_byname(struct SLink* lp, const char* name,
+                                  int statmask)
+{
+  struct ConfItem* tmp;
+  assert(0 != name);
+
+  if (HOSTLEN < strlen(name))
+    return 0;
+
+  for (; lp; lp = lp->next) {
+    tmp = lp->value.aconf;
+    if (0 != (tmp->status & statmask)) {
+      assert(0 != tmp->name);
+      if (0 == ircd_strcmp(tmp->name, name) || 0 == match(tmp->name, name))
+        return tmp;
+    }
+  }
+  return 0;
+}
+
+/** Find a ConfItem from a list that has a host that matches \a host.
+ * @param lp List to search in.
+ * @param host Filter for ConfItem::host field; matches as a glob.
+ * @param statmask Filter for ConfItem::status.
+ * @return First matching ConfItem from \a lp.
+ */
+struct ConfItem* find_conf_byhost(struct SLink* lp, const char* host,
+                                  int statmask)
+{
+  struct ConfItem* tmp = NULL;
+  assert(0 != host);
+
+  if (HOSTLEN < strlen(host))
+    return 0;
+
+  for (; lp; lp = lp->next) {
+    tmp = lp->value.aconf;
+    if (0 != (tmp->status & statmask)) {
+      assert(0 != tmp->host);
+      if (0 == match(tmp->host, host))
+        return tmp;
+    }
+  }
+  return 0;
+}
+
+/** Find a ConfItem from a list that has an address equal to \a ip.
+ * @param lp List to search in.
+ * @param ip Filter for ConfItem::address field; matches exactly.
+ * @param statmask Filter for ConfItem::status.
+ * @return First matching ConfItem from \a lp.
+ */
+struct ConfItem* find_conf_byip(struct SLink* lp, const struct irc_in_addr* ip,
+                                int statmask)
+{
+  struct ConfItem* tmp;
+
+  for (; lp; lp = lp->next) {
+    tmp = lp->value.aconf;
+    if (0 != (tmp->status & statmask)
+        && !irc_in_addr_cmp(&tmp->address.addr, ip))
+      return tmp;
+  }
+  return 0;
+}
+
+/** Free all CRules from #cruleConfList. */
+void conf_erase_crule_list(void)
+{
+  struct CRuleConf* next;
+  struct CRuleConf* p = cruleConfList;
+
+  for ( ; p; p = next) {
+    next = p->next;
+    crule_free(&p->node);
+    MyFree(p->hostmask);
+    MyFree(p->rule);
+    MyFree(p);
+  }
+  cruleConfList = 0;
+}
+
+/** Return #cruleConfList.
+ * @return #cruleConfList
+ */
+const struct CRuleConf* conf_get_crule_list(void)
+{
+  return cruleConfList;
+}
+
+/** Free all deny rules from #denyConfList. */
+void conf_erase_deny_list(void)
+{
+  struct DenyConf* next;
+  struct DenyConf* p = denyConfList;
+  for ( ; p; p = next) {
+    next = p->next;
+    MyFree(p->hostmask);
+    MyFree(p->usermask);
+    MyFree(p->message);
+    MyFree(p->realmask);
+    MyFree(p);
+  }
+  denyConfList = 0;
+}
+
+/** Return #denyConfList.
+ * @return #denyConfList
+ */
+const struct DenyConf* conf_get_deny_list(void)
+{
+  return denyConfList;
+}
+
+/** Find any existing quarantine for the named channel.
+ * @param chname Channel name to search for.
+ * @return Reason for channel's quarantine, or NULL if none exists.
+ */
+const char*
+find_quarantine(const char *chname)
+{
+  struct qline *qline;
+
+  for (qline = GlobalQuarantineList; qline; qline = qline->next)
+    if (!ircd_strcmp(qline->chname, chname))
+      return qline->reason;
+  return NULL;
+}
+
+/** Free all qline structs from #GlobalQuarantineList. */
+void clear_quarantines(void)
+{
+  struct qline *qline;
+  while ((qline = GlobalQuarantineList))
+  {
+    GlobalQuarantineList = qline->next;
+    MyFree(qline->reason);
+    MyFree(qline->chname);
+    MyFree(qline);
+  }
+}
+
+/** When non-zero, indicates that a configuration error has been seen in this pass. */
+static int conf_error;
+/** When non-zero, indicates that the configuration file was loaded at least once. */
+static int conf_already_read;
+extern void yyparse(void);
+extern int init_lexer(void);
+extern void deinit_lexer(void);
+
+/** Read configuration file.
+ * @return Zero on failure, non-zero on success. */
+int read_configuration_file(void)
+{
+  conf_error = 0;
+  feature_unmark(); /* unmark all features for resetting later */
+  clear_nameservers(); /* clear previous list of DNS servers */
+  if (!init_lexer())
+    return 0;
+  yyparse();
+  deinit_lexer();
+  feature_mark(); /* reset unmarked features */
+  conf_already_read = 1;
+  return 1;
+}
+
+/** Report an error message about the configuration file.
+ * @param msg The error to report.
+ */
+void
+yyerror(const char *msg)
+{
+ sendto_opmask_butone(0, SNO_ALL, "Config file parse error line %d: %s",
+                      lineno, msg);
+ log_write(LS_CONFIG, L_ERROR, 0, "Config file parse error line %d: %s",
+           lineno, msg);
+ if (!conf_already_read)
+   fprintf(stderr, "Config file parse error line %d: %s\n", lineno, msg);
+ conf_error = 1;
+}
+
+/** Attach CONF_UWORLD items to a server and everything attached to it. */
+static void
+attach_conf_uworld(struct Client *cptr)
+{
+  struct DLink *lp;
+
+  attach_confs_byhost(cptr, cli_name(cptr), CONF_UWORLD);
+  for (lp = cli_serv(cptr)->down; lp; lp = lp->next)
+    attach_conf_uworld(lp->value.cptr);
+}
+
+/** Free all memory associated with service mapping \a smap.
+ * @param smap[in] The mapping to free.
+ */
+void free_mapping(struct s_map *smap)
+{
+  struct nick_host *nh, *next;
+  for (nh = smap->services; nh; nh = next)
+  {
+    next = nh->next;
+    MyFree(nh);
+  }
+  MyFree(smap->name);
+  MyFree(smap->command);
+  MyFree(smap->prepend);
+  MyFree(smap);
+}
+
+/** Unregister and free all current service mappings. */
+static void close_mappings(void)
+{
+  struct s_map *map, *next;
+
+  for (map = GlobalServiceMapList; map; map = next) {
+    next = map->next;
+    unregister_mapping(map);
+    free_mapping(map);
+  }
+  GlobalServiceMapList = NULL;
+}
+
+/** Reload the configuration file.
+ * @param cptr Client that requested rehash (if a signal, &me).
+ * @param sig Type of rehash (0 = oper-requested, 1 = signal, 2 =
+ *   oper-requested but do not restart resolver)
+ * @return CPTR_KILLED if any client was K/G-lined because of the
+ * rehash; otherwise 0.
+ */
+int rehash(struct Client *cptr, int sig)
+{
+  struct ConfItem** tmp = &GlobalConfList;
+  struct ConfItem*  tmp2;
+  struct Client*    acptr;
+  int               i;
+  int               ret = 0;
+  int               found_g = 0;
+
+  if (1 == sig)
+    sendto_opmask_butone(0, SNO_OLDSNO,
+                         "Got signal SIGHUP, reloading ircd conf. file");
+
+  while ((tmp2 = *tmp)) {
+    if (tmp2->clients) {
+      /*
+       * Configuration entry is still in use by some
+       * local clients, cannot delete it--mark it so
+       * that it will be deleted when the last client
+       * exits...
+       */
+      if (CONF_CLIENT == (tmp2->status & CONF_CLIENT))
+        tmp = &tmp2->next;
+      else {
+        *tmp = tmp2->next;
+        tmp2->next = 0;
+      }
+      tmp2->status |= CONF_ILLEGAL;
+    }
+    else {
+      *tmp = tmp2->next;
+      free_conf(tmp2);
+    }
+  }
+  conf_erase_crule_list();
+  conf_erase_deny_list();
+  motd_clear();
+
+  /*
+   * delete the juped nicks list
+   */
+  clearNickJupes();
+
+  clear_quarantines();
+
+  class_mark_delete();
+  mark_listeners_closing();
+  auth_mark_closing();
+  close_mappings();
+
+  read_configuration_file();
+
+  if (sig != 2)
+    restart_resolver();
+
+  log_reopen(); /* reopen log files */
+
+  auth_close_unused();
+  close_listeners();
+  class_delete_marked();         /* unless it fails */
+
+  /*
+   * Flush out deleted I and P lines although still in use.
+   */
+  for (tmp = &GlobalConfList; (tmp2 = *tmp);) {
+    if (CONF_ILLEGAL == (tmp2->status & CONF_ILLEGAL)) {
+      *tmp = tmp2->next;
+      tmp2->next = NULL;
+      if (!tmp2->clients)
+        free_conf(tmp2);
+    }
+    else
+      tmp = &tmp2->next;
+  }
+
+  for (i = 0; i <= HighestFd; i++) {
+    if ((acptr = LocalClientArray[i])) {
+      assert(!IsMe(acptr));
+      if (IsServer(acptr))
+        det_confs_butmask(acptr, ~(CONF_UWORLD | CONF_ILLEGAL));
+      /* Because admin's are getting so uppity about people managing to
+       * get past K/G's etc, we'll "fix" the bug by actually explaining
+       * whats going on.
+       */
+      if ((found_g = find_kill(acptr))) {
+        sendto_opmask_butone(0, found_g == -2 ? SNO_GLINE : SNO_OPERKILL,
+                             found_g == -2 ? "G-line active for %s%s" :
+                             "K-line active for %s%s",
+                             IsUnknown(acptr) ? "Unregistered Client ":"",
+                             get_client_name(acptr, SHOW_IP));
+        if (exit_client(cptr, acptr, &me, found_g == -2 ? "G-lined" :
+            "K-lined") == CPTR_KILLED)
+          ret = CPTR_KILLED;
+      }
+    }
+  }
+
+  attach_conf_uworld(&me);
+
+  return ret;
+}
+
+/** Read configuration file for the very first time.
+ * @return Non-zero on success, zero on failure.
+ */
+
+int init_conf(void)
+{
+  if (read_configuration_file()) {
+    /*
+     * make sure we're sane to start if the config
+     * file read didn't get everything we need.
+     * XXX - should any of these abort the server?
+     * TODO: add warning messages
+     */
+    if (0 == localConf.name || 0 == localConf.numeric)
+      return 0;
+    if (conf_error)
+      return 0;
+
+    if (0 == localConf.location1)
+      DupString(localConf.location1, "");
+    if (0 == localConf.location2)
+      DupString(localConf.location2, "");
+    if (0 == localConf.contact)
+      DupString(localConf.contact, "");
+
+    return 1;
+  }
+  return 0;
+}
+
+/** Searches for a K/G-line for a client.  If one is found, notify the
+ * user and disconnect them.
+ * @param cptr Client to search for.
+ * @return 0 if client is accepted; -1 if client was locally denied
+ * (K-line); -2 if client was globally denied (G-line).
+ */
+int find_kill(struct Client *cptr)
+{
+  const char*      host;
+  const char*      name;
+  const char*      realname;
+  struct DenyConf* deny;
+  struct Gline*    agline = NULL;
+
+  assert(0 != cptr);
+
+  if (!cli_user(cptr))
+    return 0;
+
+  host = cli_sockhost(cptr);
+  name = cli_user(cptr)->username;
+  realname = cli_info(cptr);
+
+  assert(strlen(host) <= HOSTLEN);
+  assert((name ? strlen(name) : 0) <= HOSTLEN);
+  assert((realname ? strlen(realname) : 0) <= REALLEN);
+
+  /* 2000-07-14: Rewrote this loop for massive speed increases.
+   *             -- Isomer
+   */
+  for (deny = denyConfList; deny; deny = deny->next) {
+    if (deny->usermask && match(deny->usermask, name))
+      continue;
+    if (deny->realmask && match(deny->realmask, realname))
+      continue;
+    if (deny->bits > 0) {
+      if (!ipmask_check(&cli_ip(cptr), &deny->address, deny->bits))
+        continue;
+    } else if (deny->hostmask && match(deny->hostmask, host))
+      continue;
+
+    if (EmptyString(deny->message))
+      send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
+                 ":Connection from your host is refused on this server.");
+    else {
+      if (deny->flags & DENY_FLAGS_FILE)
+        killcomment(cptr, deny->message);
+      else
+        send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s.", deny->message);
+    }
+    return -1;
+  }
+
+  if (!feature_bool(FEAT_DISABLE_GLINES) && (agline = gline_lookup(cptr, 0))) {
+    /*
+     * find active glines
+     * added a check against the user's IP address to find_gline() -Kev
+     */
+    send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s.", GlineReason(agline));
+    return -2;
+  }
+
+  return 0;
+}
+
+/** Attempt to attach Client blocks to \a cptr.  If attach_iline()
+ * fails for the client, emit a debugging message.
+ * @param cptr Client to check for access.
+ * @return Access check result.
+ */
+enum AuthorizationCheckResult conf_check_client(struct Client *cptr)
+{
+  enum AuthorizationCheckResult acr = ACR_OK;
+
+  if ((acr = attach_iline(cptr))) {
+    Debug((DEBUG_DNS, "ch_cl: access denied: %s[%s]", 
+          cli_name(cptr), cli_sockhost(cptr)));
+    return acr;
+  }
+  return ACR_OK;
+}
+
+/** Check access for a server given its name (passed in cptr struct).
+ * Must check for all C/N lines which have a name which matches the
+ * name given and a host which matches. A host alias which is the
+ * same as the server name is also acceptable in the host field of a
+ * C/N line.
+ * @param cptr Peer server to check.
+ * @return 0 if accepted, -1 if access denied.
+ */
+int conf_check_server(struct Client *cptr)
+{
+  struct ConfItem* c_conf = NULL;
+  struct SLink*    lp;
+
+  Debug((DEBUG_DNS, "sv_cl: check access for %s[%s]", 
+        cli_name(cptr), cli_sockhost(cptr)));
+
+  if (IsUnknown(cptr) && !attach_confs_byname(cptr, cli_name(cptr), CONF_SERVER)) {
+    Debug((DEBUG_DNS, "No C/N lines for %s", cli_sockhost(cptr)));
+    return -1;
+  }
+  lp = cli_confs(cptr);
+  /*
+   * We initiated this connection so the client should have a C and N
+   * line already attached after passing through the connect_server()
+   * function earlier.
+   */
+  if (IsConnecting(cptr) || IsHandshake(cptr)) {
+    c_conf = find_conf_byname(lp, cli_name(cptr), CONF_SERVER);
+    if (!c_conf) {
+      sendto_opmask_butone(0, SNO_OLDSNO,
+                           "Connect Error: lost Connect block for %s",
+                           cli_name(cptr));
+      det_confs_butmask(cptr, 0);
+      return -1;
+    }
+  }
+
+  /* Try finding the Connect block by DNS name and IP next. */
+  if (!c_conf && !(c_conf = find_conf_byhost(lp, cli_sockhost(cptr), CONF_SERVER)))
+        c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
+
+  /*
+   * Attach by IP# only if all other checks have failed.
+   * It is quite possible to get here with the strange things that can
+   * happen when using DNS in the way the irc server does. -avalon
+   */
+  if (!c_conf)
+    c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
+  /*
+   * detach all conf lines that got attached by attach_confs()
+   */
+  det_confs_butmask(cptr, 0);
+  /*
+   * if no Connect block, then deny access
+   */
+  if (!c_conf) {
+    Debug((DEBUG_DNS, "sv_cl: access denied: %s[%s@%s]",
+          cli_name(cptr), cli_username(cptr), cli_sockhost(cptr)));
+    return -1;
+  }
+  /*
+   * attach the Connect block to the client structure for later use.
+   */
+  attach_conf(cptr, c_conf);
+
+  if (!irc_in_addr_valid(&c_conf->address.addr))
+    memcpy(&c_conf->address.addr, &cli_ip(cptr), sizeof(c_conf->address.addr));
+
+  Debug((DEBUG_DNS, "sv_cl: access ok: %s[%s]",
+         cli_name(cptr), cli_sockhost(cptr)));
+  return 0;
+}
+