ircd/s_conf.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/s_conf.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 1, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write to the Free Software
  18  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19  */
  20 /** @file
  21  * @brief ircd configuration file driver
  22  * @version $Id: s_conf.c,v 1.81.2.8 2007/04/05 01:52:39 entrope Exp $
  23  */
  24 #include "config.h"
  25
  26 #include "s_conf.h"
  27 #include "IPcheck.h"
  28 #include "class.h"
  29 #include "client.h"
  30 #include "crule.h"
  31 #include "ircd_features.h"
  32 #include "fileio.h"
  33 #include "gline.h"
  34 #include "hash.h"
  35 #include "ircd.h"
  36 #include "ircd_alloc.h"
  37 #include "ircd_chattr.h"
  38 #include "ircd_log.h"
  39 #include "ircd_reply.h"
  40 #include "ircd_snprintf.h"
  41 #include "ircd_string.h"
  42 #include "list.h"
  43 #include "listener.h"
  44 #include "match.h"
  45 #include "motd.h"
  46 #include "numeric.h"
  47 #include "numnicks.h"
  48 #include "opercmds.h"
  49 #include "parse.h"
  50 #include "res.h"
  51 #include "s_auth.h"
  52 #include "s_bsd.h"
  53 #include "s_debug.h"
  54 #include "s_misc.h"
  55 #include "send.h"
  56 #include "struct.h"
  57 #include "sys.h"
  58
  59 /* #include <assert.h> -- Now using assert in ircd_log.h */
  60 #include <errno.h>
  61 #include <fcntl.h>
  62 #include <netdb.h>
  63 #include <stdio.h>
  64 #include <stdlib.h>
  65 #include <string.h>
  66 #include <sys/stat.h>
  67 #include <unistd.h>
  68
  69 /** Global list of all ConfItem structures. */
  70 struct ConfItem  *GlobalConfList;
  71 /** Count of items in #GlobalConfList. */
  72 int              GlobalConfCount;
  73 /** Global list of service mappings. */
  74 struct s_map     *GlobalServiceMapList;
  75 /** Global list of channel quarantines. */
  76 struct qline     *GlobalQuarantineList;
  77 /** Global list of spoofhosts. */
  78 struct sline    *GlobalSList = 0;
  79
  80 /** Current line number in scanner input. */
  81 int lineno;
  82
  83 /** Configuration information for #me. */
  84 struct LocalConf   localConf;
  85 /** Global list of connection rules. */
  86 struct CRuleConf*  cruleConfList;
  87 /** Global list of K-lines. */
  88 struct DenyConf*   denyConfList;
  89
  90 /** Tell a user that they are banned, dumping the message from a file.
  91  * @param sptr Client being rejected
  92  * @param filename Send this file's contents to \a sptr
  93  */
  94 static void killcomment(struct Client* sptr, const char* filename)
  95 {
  96   FBFILE*     file = 0;
  97   char        line[80];
  98   struct stat sb;
  99   struct tm*  tm;
 100
 101   if (NULL == (file = fbopen(filename, "r"))) {
 102     send_reply(sptr, ERR_NOMOTD);
 103     send_reply(sptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
 104                ":Connection from your host is refused on this server.");
 105     return;
 106   }
 107   fbstat(&sb, file);
 108   tm = localtime((time_t*) &sb.st_mtime);        /* NetBSD needs cast */
 109   while (fbgets(line, sizeof(line) - 1, file)) {
 110     char* end = line + strlen(line);
 111     while (end > line) {
 112       --end;
 113       if ('\n' == *end || '\r' == *end)
 114         *end = '\0';
 115       else
 116         break;
 117     }
 118     send_reply(sptr, RPL_MOTD, line);
 119   }
 120   send_reply(sptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
 121              ":Connection from your host is refused on this server.");
 122   fbclose(file);
 123 }
 124
 125 /** Allocate a new struct ConfItem and link it to #GlobalConfList.
 126  * @return Newly allocated structure.
 127  */
 128 struct ConfItem* make_conf(int type)
 129 {
 130   struct ConfItem* aconf;
 131
 132   aconf = (struct ConfItem*) MyMalloc(sizeof(struct ConfItem));
 133   assert(0 != aconf);
 134   ++GlobalConfCount;
 135   memset(aconf, 0, sizeof(struct ConfItem));
 136   aconf->status  = type;
 137   aconf->next    = GlobalConfList;
 138   GlobalConfList = aconf;
 139   return aconf;
 140 }
 141
 142 /** Free a struct ConfItem and any resources it owns.
 143  * @param aconf Item to free.
 144  */
 145 void free_conf(struct ConfItem *aconf)
 146 {
 147   Debug((DEBUG_DEBUG, "free_conf: %s %s %d",
 148          aconf->host ? aconf->host : "*",
 149          aconf->name ? aconf->name : "*",
 150          aconf->address.port));
 151   if (aconf->dns_pending)
 152     delete_resolver_queries(aconf);
 153   MyFree(aconf->username);
 154   MyFree(aconf->host);
 155   MyFree(aconf->origin_name);
 156   if (aconf->passwd)
 157     memset(aconf->passwd, 0, strlen(aconf->passwd));
 158   MyFree(aconf->passwd);
 159   MyFree(aconf->name);
 160   MyFree(aconf->hub_limit);
 161   MyFree(aconf);
 162   --GlobalConfCount;
 163 }
 164
 165 /** Disassociate configuration from the client.
 166  * @param cptr Client to operate on.
 167  * @param aconf ConfItem to detach.
 168  */
 169 static void detach_conf(struct Client* cptr, struct ConfItem* aconf)
 170 {
 171   struct SLink** lp;
 172   struct SLink*  tmp;
 173
 174   assert(0 != aconf);
 175   assert(0 != cptr);
 176   assert(0 < aconf->clients);
 177
 178   lp = &(cli_confs(cptr));
 179
 180   while (*lp) {
 181     if ((*lp)->value.aconf == aconf) {
 182       if (aconf->conn_class && (aconf->status & CONF_CLIENT_MASK) && ConfLinks(aconf) > 0)
 183         --ConfLinks(aconf);
 184
 185       assert(0 < aconf->clients);
 186       if (0 == --aconf->clients && IsIllegal(aconf))
 187         free_conf(aconf);
 188       tmp = *lp;
 189       *lp = tmp->next;
 190       free_link(tmp);
 191       return;
 192     }
 193     lp = &((*lp)->next);
 194   }
 195 }
 196
 197 /** Parse a user\@host mask into username and host or IP parts.
 198  * If \a host contains no username part, set \a aconf->username to
 199  * NULL.  If the host part of \a host looks like an IP mask, set \a
 200  * aconf->addrbits and \a aconf->address to match.  Otherwise, set
 201  * \a aconf->host, and set \a aconf->addrbits to -1.
 202  * @param[in,out] aconf Configuration item to set.
 203  * @param[in] host user\@host mask to parse.
 204  */
 205 void conf_parse_userhost(struct ConfItem *aconf, char *host)
 206 {
 207   char *host_part;
 208   unsigned char addrbits;
 209
 210   MyFree(aconf->username);
 211   MyFree(aconf->host);
 212   host_part = strchr(host, '@');
 213   if (host_part) {
 214     *host_part = '\0';
 215     DupString(aconf->username, host);
 216     host_part++;
 217   } else {
 218     aconf->username = NULL;
 219     host_part = host;
 220   }
 221   DupString(aconf->host, host_part);
 222   if (ipmask_parse(aconf->host, &aconf->address.addr, &addrbits))
 223     aconf->addrbits = addrbits;
 224   else
 225     aconf->addrbits = -1;
 226 }
 227
 228 /** Copies a completed DNS query into its ConfItem.
 229  * @param vptr Pointer to struct ConfItem for the block.
 230  * @param hp DNS reply, or NULL if the lookup failed.
 231  */
 232 static void conf_dns_callback(void* vptr, const struct irc_in_addr *addr, const char *h_name)
 233 {
 234   struct ConfItem* aconf = (struct ConfItem*) vptr;
 235   assert(aconf);
 236   aconf->dns_pending = 0;
 237   if (addr)
 238     memcpy(&aconf->address.addr, addr, sizeof(aconf->address.addr));
 239 }
 240
 241 /** Start a nameserver lookup of the conf host.  If the conf entry is
 242  * currently doing a lookup, do nothing.
 243  * @param aconf ConfItem for which to start a request.
 244  */
 245 static void conf_dns_lookup(struct ConfItem* aconf)
 246 {
 247   if (!aconf->dns_pending) {
 248     char            buf[HOSTLEN + 1];
 249
 250     host_from_uh(buf, aconf->host, HOSTLEN);
 251     gethost_byname(buf, conf_dns_callback, aconf);
 252     aconf->dns_pending = 1;
 253   }
 254 }
 255
 256
 257 /** Start lookups of all addresses in the conf line.  The origin must
 258  * be a numeric IP address.  If the remote host field is not an IP
 259  * address, start a DNS lookup for it.
 260  * @param aconf Connection to do lookups for.
 261  */
 262 void
 263 lookup_confhost(struct ConfItem *aconf)
 264 {
 265   if (EmptyString(aconf->host) || EmptyString(aconf->name)) {
 266     Debug((DEBUG_ERROR, "Host/server name error: (%s) (%s)",
 267            aconf->host, aconf->name));
 268     return;
 269   }
 270   if (aconf->origin_name
 271       && !ircd_aton(&aconf->origin.addr, aconf->origin_name)) {
 272     Debug((DEBUG_ERROR, "Origin name error: (%s) (%s)",
 273         aconf->origin_name, aconf->name));
 274   }
 275   /*
 276    * Do name lookup now on hostnames given and store the
 277    * ip numbers in conf structure.
 278    */
 279   if (IsIP6Char(*aconf->host)) {
 280     if (!ircd_aton(&aconf->address.addr, aconf->host)) {
 281       Debug((DEBUG_ERROR, "Host/server name error: (%s) (%s)",
 282           aconf->host, aconf->name));
 283     }
 284   }
 285   else
 286     conf_dns_lookup(aconf);
 287 }
 288
 289 /** Find a server by name or hostname.
 290  * @param name Server name to find.
 291  * @return Pointer to the corresponding ConfItem, or NULL if none exists.
 292  */
 293 struct ConfItem* conf_find_server(const char* name)
 294 {
 295   struct ConfItem* conf;
 296   assert(0 != name);
 297
 298   for (conf = GlobalConfList; conf; conf = conf->next) {
 299     if (CONF_SERVER == conf->status) {
 300       /*
 301        * Check first servernames, then try hostnames.
 302        * XXX - match returns 0 if there _is_ a match... guess they
 303        * haven't decided what true is yet
 304        */
 305       if (0 == match(name, conf->name))
 306         return conf;
 307     }
 308   }
 309   return 0;
 310 }
 311
 312 /** Evaluate connection rules.
 313  * @param name Name of server to check
 314  * @param mask Filter for CRule types (only consider if type & \a mask != 0).
 315  * @return Name of rule that forbids the connection; NULL if no prohibitions.
 316  */
 317 const char* conf_eval_crule(const char* name, int mask)
 318 {
 319   struct CRuleConf* p = cruleConfList;
 320   assert(0 != name);
 321
 322   for ( ; p; p = p->next) {
 323     if (0 != (p->type & mask) && 0 == match(p->hostmask, name)) {
 324       if (crule_eval(p->node))
 325         return p->rule;
 326     }
 327   }
 328   return 0;
 329 }
 330
 331 /** Remove all conf entries from the client except those which match
 332  * the status field mask.
 333  * @param cptr Client to operate on.
 334  * @param mask ConfItem types to keep.
 335  */
 336 void det_confs_butmask(struct Client* cptr, int mask)
 337 {
 338   struct SLink* link;
 339   struct SLink* next;
 340   assert(0 != cptr);
 341
 342   for (link = cli_confs(cptr); link; link = next) {
 343     next = link->next;
 344     if ((link->value.aconf->status & mask) == 0)
 345       detach_conf(cptr, link->value.aconf);
 346   }
 347 }
 348
 349 /** Find the first (best) Client block to attach.
 350  * @param cptr Client for whom to check rules.
 351  * @return Authorization check result.
 352  */
 353 enum AuthorizationCheckResult attach_iline(struct Client* cptr)
 354 {
 355   struct ConfItem* aconf;
 356
 357   assert(0 != cptr);
 358
 359   for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
 360     if (aconf->status != CONF_CLIENT)
 361       continue;
 362     /* If you change any of this logic, please make corresponding
 363      * changes in conf_debug_iline() below.
 364      */
 365     if (aconf->address.port && aconf->address.port != cli_listener(cptr)->addr.port)
 366       continue;
 367     if (aconf->username && match(aconf->username, cli_username(cptr)))
 368       continue;
 369     if (aconf->host && match(aconf->host, cli_sockhost(cptr)))
 370       continue;
 371     if ((aconf->addrbits >= 0)
 372         && !ipmask_check(&cli_ip(cptr), &aconf->address.addr, aconf->addrbits))
 373       continue;
 374     if (IPcheck_nr(cptr) > aconf->maximum)
 375       return ACR_TOO_MANY_FROM_IP;
 376     if (aconf->username)
 377       SetFlag(cptr, FLAG_DOID);
 378     return attach_conf(cptr, aconf);
 379   }
 380   return ACR_NO_AUTHORIZATION;
 381 }
 382
 383 /** Interpret \a client as a client specifier and show which Client
 384  * block(s) match that client.
 385  *
 386  * The client specifier may contain an IP address, hostname, listener
 387  * port, or a combination of those separated by commas.  IP addresses
 388  * and hostnamese may be preceded by "username@"; the last given
 389  * username will be used for the match.
 390  *
 391  * @param[in] client Client specifier.
 392  * @return Matching Client block structure.
 393  */
 394 struct ConfItem *conf_debug_iline(const char *client)
 395 {
 396   struct irc_in_addr address;
 397   struct ConfItem *aconf;
 398   struct DenyConf *deny;
 399   char *sep;
 400   unsigned short listener;
 401   char username[USERLEN+1], hostname[HOSTLEN+1], realname[REALLEN+1];
 402
 403   /* Initialize variables. */
 404   listener = 0;
 405   memset(&address, 0, sizeof(address));
 406   memset(&username, 0, sizeof(username));
 407   memset(&hostname, 0, sizeof(hostname));
 408   memset(&realname, 0, sizeof(realname));
 409
 410   /* Parse client specifier. */
 411   while (*client) {
 412     struct irc_in_addr tmpaddr;
 413     long tmp;
 414
 415     /* Try to parse as listener port number first. */
 416     tmp = strtol(client, &sep, 10);
 417     if (tmp && (*sep == '\0' || *sep == ',')) {
 418       listener = tmp;
 419       client = sep + (*sep != '\0');
 420       continue;
 421     }
 422
 423     /* Maybe username@ before an IP address or hostname? */
 424     tmp = strcspn(client, ",@");
 425     if (client[tmp] == '@') {
 426       if (tmp > USERLEN)
 427         tmp = USERLEN;
 428       ircd_strncpy(username, client, tmp);
 429       /* and fall through */
 430       client += tmp + 1;
 431     }
 432
 433     /* Looks like an IP address? */
 434     tmp = ircd_aton(&tmpaddr, client);
 435     if (tmp && (client[tmp] == '\0' || client[tmp] == ',')) {
 436         memcpy(&address, &tmpaddr, sizeof(address));
 437         client += tmp + (client[tmp] != '\0');
 438         continue;
 439     }
 440
 441     /* Realname? */
 442     if (client[0] == '$' && client[1] == 'R') {
 443       client += 2;
 444       for (tmp = 0; *client != '\0' && *client != ',' && tmp < REALLEN; ++client, ++tmp) {
 445         if (*client == '\\')
 446           realname[tmp] = *++client;
 447         else
 448           realname[tmp] = *client;
 449       }
 450       continue;
 451     }
 452
 453     /* Else must be a hostname. */
 454     tmp = strcspn(client, ",");
 455     if (tmp > HOSTLEN)
 456       tmp = HOSTLEN;
 457     ircd_strncpy(hostname, client, tmp);
 458     client += tmp + (client[tmp] != '\0');
 459   }
 460
 461   /* Walk configuration to find matching Client block. */
 462   for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
 463     if (aconf->status != CONF_CLIENT)
 464       continue;
 465     if (aconf->address.port && aconf->address.port != listener) {
 466       fprintf(stdout, "Listener port mismatch: %u != %u\n", aconf->address.port, listener);
 467       continue;
 468     }
 469     if (aconf->username && match(aconf->username, username)) {
 470       fprintf(stdout, "Username mismatch: %s != %s\n", aconf->username, username);
 471       continue;
 472     }
 473     if (aconf->host && match(aconf->host, hostname)) {
 474       fprintf(stdout, "Hostname mismatch: %s != %s\n", aconf->host, hostname);
 475       continue;
 476     }
 477     if ((aconf->addrbits >= 0)
 478         && !ipmask_check(&address, &aconf->address.addr, aconf->addrbits)) {
 479       fprintf(stdout, "IP address mismatch: %s != %s\n", aconf->name, ircd_ntoa(&address));
 480       continue;
 481     }
 482     fprintf(stdout, "Match! username=%s host=%s ip=%s class=%s maxlinks=%u password=%s\n",
 483             (aconf->username ? aconf->username : "(null)"),
 484             (aconf->host ? aconf->host : "(null)"),
 485             (aconf->name ? aconf->name : "(null)"),
 486             ConfClass(aconf), aconf->maximum,
 487             (aconf->passwd ? aconf->passwd : "(null)"));
 488     break;
 489   }
 490
 491   /* If no authorization, say so and exit. */
 492   if (!aconf)
 493   {
 494     fprintf(stdout, "No authorization found.\n");
 495     return NULL;
 496   }
 497
 498   /* Look for a Kill block with the user's name on it. */
 499   for (deny = denyConfList; deny; deny = deny->next) {
 500     if (deny->usermask && match(deny->usermask, username))
 501       continue;
 502     if (deny->realmask && match(deny->realmask, realname))
 503       continue;
 504     if (deny->bits > 0) {
 505       if (!ipmask_check(&address, &deny->address, deny->bits))
 506         continue;
 507     } else if (deny->hostmask && match(deny->hostmask, hostname))
 508       continue;
 509
 510     /* Looks like a match; report it. */
 511     fprintf(stdout, "Denied! usermask=%s realmask=\"%s\" hostmask=%s (bits=%u)\n",
 512             deny->usermask ? deny->usermask : "(null)",
 513             deny->realmask ? deny->realmask : "(null)",
 514             deny->hostmask ? deny->hostmask : "(null)",
 515             deny->bits);
 516   }
 517
 518   return aconf;
 519 }
 520
 521 /** Check whether a particular ConfItem is already attached to a
 522  * Client.
 523  * @param aconf ConfItem to search for
 524  * @param cptr Client to check
 525  * @return Non-zero if \a aconf is attached to \a cptr, zero if not.
 526  */
 527 static int is_attached(struct ConfItem *aconf, struct Client *cptr)
 528 {
 529   struct SLink *lp;
 530
 531   for (lp = cli_confs(cptr); lp; lp = lp->next) {
 532     if (lp->value.aconf == aconf)
 533       return 1;
 534   }
 535   return 0;
 536 }
 537
 538 /** Associate a specific configuration entry to a *local* client (this
 539  * is the one which used in accepting the connection). Note, that this
 540  * automatically changes the attachment if there was an old one...
 541  * @param cptr Client to attach \a aconf to
 542  * @param aconf ConfItem to attach
 543  * @return Authorization check result.
 544  */
 545 enum AuthorizationCheckResult attach_conf(struct Client *cptr, struct ConfItem *aconf)
 546 {
 547   struct SLink *lp;
 548
 549   if (is_attached(aconf, cptr))
 550     return ACR_ALREADY_AUTHORIZED;
 551   if (IsIllegal(aconf))
 552     return ACR_NO_AUTHORIZATION;
 553   if ((aconf->status & (CONF_OPERATOR | CONF_CLIENT)) &&
 554       ConfLinks(aconf) >= ConfMaxLinks(aconf) && ConfMaxLinks(aconf) > 0)
 555     return ACR_TOO_MANY_IN_CLASS;  /* Use this for printing error message */
 556   lp = make_link();
 557   lp->next = cli_confs(cptr);
 558   lp->value.aconf = aconf;
 559   cli_confs(cptr) = lp;
 560   ++aconf->clients;
 561   if (aconf->status & CONF_CLIENT_MASK)
 562     ConfLinks(aconf)++;
 563   return ACR_OK;
 564 }
 565
 566 /** Return our LocalConf configuration structure.
 567  * @return A pointer to #localConf.
 568  */
 569 const struct LocalConf* conf_get_local(void)
 570 {
 571   return &localConf;
 572 }
 573
 574 /** Attach ConfItems to a client if the name passed matches that for
 575  * the ConfItems or is an exact match for them.
 576  * @param cptr Client getting the ConfItem attachments.
 577  * @param name Filter to match ConfItem::name.
 578  * @param statmask Filter to limit ConfItem::status.
 579  * @return First ConfItem attached to \a cptr.
 580  */
 581 struct ConfItem* attach_confs_byname(struct Client* cptr, const char* name,
 582                                      int statmask)
 583 {
 584   struct ConfItem* tmp;
 585   struct ConfItem* first = NULL;
 586
 587   assert(0 != name);
 588
 589   if (HOSTLEN < strlen(name))
 590     return 0;
 591
 592   for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
 593     if (0 != (tmp->status & statmask) && !IsIllegal(tmp)) {
 594       assert(0 != tmp->name);
 595       if (0 == match(tmp->name, name) || 0 == ircd_strcmp(tmp->name, name)) {
 596         if (ACR_OK == attach_conf(cptr, tmp) && !first)
 597           first = tmp;
 598       }
 599     }
 600   }
 601   return first;
 602 }
 603
 604 /** Attach ConfItems to a client if the host passed matches that for
 605  * the ConfItems or is an exact match for them.
 606  * @param cptr Client getting the ConfItem attachments.
 607  * @param host Filter to match ConfItem::host.
 608  * @param statmask Filter to limit ConfItem::status.
 609  * @return First ConfItem attached to \a cptr.
 610  */
 611 struct ConfItem* attach_confs_byhost(struct Client* cptr, const char* host,
 612                                      int statmask)
 613 {
 614   struct ConfItem* tmp;
 615   struct ConfItem* first = 0;
 616
 617   assert(0 != host);
 618   if (HOSTLEN < strlen(host))
 619     return 0;
 620
 621   for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
 622     if (0 != (tmp->status & statmask) && !IsIllegal(tmp)) {
 623       assert(0 != tmp->host);
 624       if (0 == match(tmp->host, host) || 0 == ircd_strcmp(tmp->host, host)) {
 625         if (ACR_OK == attach_conf(cptr, tmp) && !first)
 626           first = tmp;
 627       }
 628     }
 629   }
 630   return first;
 631 }
 632
 633 /** Find a ConfItem that has the same name and user+host fields as
 634  * specified.  Requires an exact match for \a name.
 635  * @param name Name to match
 636  * @param cptr Client to match against
 637  * @param statmask Filter for ConfItem::status
 638  * @return First found matching ConfItem.
 639  */
 640 struct ConfItem* find_conf_exact(const char* name, struct Client *cptr, int statmask)
 641 {
 642   struct ConfItem *tmp;
 643
 644   for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
 645     if (!(tmp->status & statmask) || !tmp->name || !tmp->host ||
 646         0 != ircd_strcmp(tmp->name, name))
 647       continue;
 648     if (tmp->username
 649         && (EmptyString(cli_username(cptr))
 650             || match(tmp->username, cli_username(cptr))))
 651       continue;
 652     if (tmp->addrbits < 0)
 653     {
 654       if (match(tmp->host, cli_sockhost(cptr)))
 655         continue;
 656     }
 657     else if (!ipmask_check(&cli_ip(cptr), &tmp->address.addr, tmp->addrbits))
 658       continue;
 659     if ((tmp->status & CONF_OPERATOR)
 660         && (MaxLinks(tmp->conn_class) > 0)
 661         && (tmp->clients >= MaxLinks(tmp->conn_class)))
 662       continue;
 663     return tmp;
 664   }
 665   return 0;
 666 }
 667
 668 /** Find a ConfItem from a list that has a name that matches \a name.
 669  * @param lp List to search in.
 670  * @param name Filter for ConfItem::name field; matches either exactly
 671  * or as a glob.
 672  * @param statmask Filter for ConfItem::status.
 673  * @return First matching ConfItem from \a lp.
 674  */
 675 struct ConfItem* find_conf_byname(struct SLink* lp, const char* name,
 676                                   int statmask)
 677 {
 678   struct ConfItem* tmp;
 679   assert(0 != name);
 680
 681   if (HOSTLEN < strlen(name))
 682     return 0;
 683
 684   for (; lp; lp = lp->next) {
 685     tmp = lp->value.aconf;
 686     if (0 != (tmp->status & statmask)) {
 687       assert(0 != tmp->name);
 688       if (0 == ircd_strcmp(tmp->name, name) || 0 == match(tmp->name, name))
 689         return tmp;
 690     }
 691   }
 692   return 0;
 693 }
 694
 695 /** Find a ConfItem from a list that has a host that matches \a host.
 696  * @param lp List to search in.
 697  * @param host Filter for ConfItem::host field; matches as a glob.
 698  * @param statmask Filter for ConfItem::status.
 699  * @return First matching ConfItem from \a lp.
 700  */
 701 struct ConfItem* find_conf_byhost(struct SLink* lp, const char* host,
 702                                   int statmask)
 703 {
 704   struct ConfItem* tmp = NULL;
 705   assert(0 != host);
 706
 707   if (HOSTLEN < strlen(host))
 708     return 0;
 709
 710   for (; lp; lp = lp->next) {
 711     tmp = lp->value.aconf;
 712     if (0 != (tmp->status & statmask)) {
 713       assert(0 != tmp->host);
 714       if (0 == match(tmp->host, host))
 715         return tmp;
 716     }
 717   }
 718   return 0;
 719 }
 720
 721 /** Find a ConfItem from a list that has an address equal to \a ip.
 722  * @param lp List to search in.
 723  * @param ip Filter for ConfItem::address field; matches exactly.
 724  * @param statmask Filter for ConfItem::status.
 725  * @return First matching ConfItem from \a lp.
 726  */
 727 struct ConfItem* find_conf_byip(struct SLink* lp, const struct irc_in_addr* ip,
 728                                 int statmask)
 729 {
 730   struct ConfItem* tmp;
 731
 732   for (; lp; lp = lp->next) {
 733     tmp = lp->value.aconf;
 734     if (0 != (tmp->status & statmask)
 735         && !irc_in_addr_cmp(&tmp->address.addr, ip))
 736       return tmp;
 737   }
 738   return 0;
 739 }
 740
 741 /** Free all CRules from #cruleConfList. */
 742 void conf_erase_crule_list(void)
 743 {
 744   struct CRuleConf* next;
 745   struct CRuleConf* p = cruleConfList;
 746
 747   for ( ; p; p = next) {
 748     next = p->next;
 749     crule_free(&p->node);
 750     MyFree(p->hostmask);
 751     MyFree(p->rule);
 752     MyFree(p);
 753   }
 754   cruleConfList = 0;
 755 }
 756
 757 /** Return #cruleConfList.
 758  * @return #cruleConfList
 759  */
 760 const struct CRuleConf* conf_get_crule_list(void)
 761 {
 762   return cruleConfList;
 763 }
 764
 765 /** Free all deny rules from #denyConfList. */
 766 void conf_erase_deny_list(void)
 767 {
 768   struct DenyConf* next;
 769   struct DenyConf* p = denyConfList;
 770   for ( ; p; p = next) {
 771     next = p->next;
 772     MyFree(p->hostmask);
 773     MyFree(p->usermask);
 774     MyFree(p->message);
 775     MyFree(p->realmask);
 776     MyFree(p);
 777   }
 778   denyConfList = 0;
 779 }
 780
 781 /** Return #denyConfList.
 782  * @return #denyConfList
 783  */
 784 const struct DenyConf* conf_get_deny_list(void)
 785 {
 786   return denyConfList;
 787 }
 788
 789 /** Find any existing quarantine for the named channel.
 790  * @param chname Channel name to search for.
 791  * @return Reason for channel's quarantine, or NULL if none exists.
 792  */
 793 const char*
 794 find_quarantine(const char *chname)
 795 {
 796   struct qline *qline;
 797
 798   for (qline = GlobalQuarantineList; qline; qline = qline->next)
 799     if (!ircd_strcmp(qline->chname, chname))
 800       return qline->reason;
 801   return NULL;
 802 }
 803
 804 /** Free all qline structs from #GlobalQuarantineList. */
 805 void clear_quarantines(void)
 806 {
 807   struct qline *qline;
 808   while ((qline = GlobalQuarantineList))
 809   {
 810     GlobalQuarantineList = qline->next;
 811     MyFree(qline->reason);
 812     MyFree(qline->chname);
 813     MyFree(qline);
 814   }
 815 }
 816
 817 /** When non-zero, indicates that a configuration error has been seen in this pass. */
 818 static int conf_error;
 819 /** When non-zero, indicates that the configuration file was loaded at least once. */
 820 static int conf_already_read;
 821 extern FILE *yyin;
 822 extern void yyparse(void);
 823 extern void init_lexer(void);
 824
 825 /** Read configuration file.
 826  * @return Zero on failure, non-zero on success. */
 827 int read_configuration_file(void)
 828 {
 829   conf_error = 0;
 830   feature_unmark(); /* unmark all features for resetting later */
 831   clear_nameservers(); /* clear previous list of DNS servers */
 832   /* Now just open an fd. The buffering isn't really needed... */
 833   init_lexer();
 834   yyparse();
 835   fclose(yyin);
 836   yyin = NULL;
 837   feature_mark(); /* reset unmarked features */
 838   conf_already_read = 1;
 839   return 1;
 840 }
 841
 842 /** Report an error message about the configuration file.
 843  * @param msg The error to report.
 844  */
 845 void
 846 yyerror(const char *msg)
 847 {
 848  sendto_opmask_butone(0, SNO_ALL, "Config file parse error line %d: %s",
 849                       lineno, msg);
 850  log_write(LS_CONFIG, L_ERROR, 0, "Config file parse error line %d: %s",
 851            lineno, msg);
 852  if (!conf_already_read)
 853    fprintf(stderr, "Config file parse error line %d: %s\n", lineno, msg);
 854  conf_error = 1;
 855 }
 856
 857 /** Attach CONF_UWORLD items to a server and everything attached to it. */
 858 static void
 859 attach_conf_uworld(struct Client *cptr)
 860 {
 861   struct DLink *lp;
 862
 863   attach_confs_byhost(cptr, cli_name(cptr), CONF_UWORLD);
 864   for (lp = cli_serv(cptr)->down; lp; lp = lp->next)
 865     attach_conf_uworld(lp->value.cptr);
 866 }
 867
 868 /** Free all memory associated with service mapping \a smap.
 869  * @param smap[in] The mapping to free.
 870  */
 871 void free_mapping(struct s_map *smap)
 872 {
 873   struct nick_host *nh, *next;
 874   for (nh = smap->services; nh; nh = next)
 875   {
 876     next = nh->next;
 877     MyFree(nh);
 878   }
 879   MyFree(smap->name);
 880   MyFree(smap->command);
 881   MyFree(smap->prepend);
 882   MyFree(smap);
 883 }
 884
 885 /** Unregister and free all current service mappings. */
 886 static void close_mappings(void)
 887 {
 888   struct s_map *map, *next;
 889
 890   for (map = GlobalServiceMapList; map; map = next) {
 891     next = map->next;
 892     unregister_mapping(map);
 893     free_mapping(map);
 894   }
 895   GlobalServiceMapList = NULL;
 896 }
 897
 898 /** Reload the configuration file.
 899  * @param cptr Client that requested rehash (if a signal, &me).
 900  * @param sig Type of rehash (0 = oper-requested, 1 = signal, 2 =
 901  *   oper-requested but do not restart resolver)
 902  * @return CPTR_KILLED if any client was K/G-lined because of the
 903  * rehash; otherwise 0.
 904  */
 905 int rehash(struct Client *cptr, int sig)
 906 {
 907   struct ConfItem** tmp = &GlobalConfList;
 908   struct ConfItem*  tmp2;
 909   struct Client*    acptr;
 910   int               i;
 911   int               ret = 0;
 912   int               found_g = 0;
 913
 914   if (1 == sig)
 915     sendto_opmask_butone(0, SNO_OLDSNO,
 916                          "Got signal SIGHUP, reloading ircd conf. file");
 917
 918   while ((tmp2 = *tmp)) {
 919     if (tmp2->clients) {
 920       /*
 921        * Configuration entry is still in use by some
 922        * local clients, cannot delete it--mark it so
 923        * that it will be deleted when the last client
 924        * exits...
 925        */
 926       if (CONF_CLIENT == (tmp2->status & CONF_CLIENT))
 927         tmp = &tmp2->next;
 928       else {
 929         *tmp = tmp2->next;
 930         tmp2->next = 0;
 931       }
 932       tmp2->status |= CONF_ILLEGAL;
 933     }
 934     else {
 935       *tmp = tmp2->next;
 936       free_conf(tmp2);
 937     }
 938   }
 939   conf_erase_crule_list();
 940   conf_erase_deny_list();
 941   motd_clear();
 942
 943   /*
 944    * delete the juped nicks list
 945    */
 946   clearNickJupes();
 947
 948   clear_quarantines();
 949   clear_slines();
 950
 951   class_mark_delete();
 952   mark_listeners_closing();
 953   auth_mark_closing();
 954   close_mappings();
 955
 956   read_configuration_file();
 957
 958   if (sig != 2)
 959     restart_resolver();
 960
 961   log_reopen(); /* reopen log files */
 962
 963   auth_close_unused();
 964   close_listeners();
 965   class_delete_marked();         /* unless it fails */
 966
 967   /*
 968    * Flush out deleted I and P lines although still in use.
 969    */
 970   for (tmp = &GlobalConfList; (tmp2 = *tmp);) {
 971     if (CONF_ILLEGAL == (tmp2->status & CONF_ILLEGAL)) {
 972       *tmp = tmp2->next;
 973       tmp2->next = NULL;
 974       if (!tmp2->clients)
 975         free_conf(tmp2);
 976     }
 977     else
 978       tmp = &tmp2->next;
 979   }
 980
 981   for (i = 0; i <= HighestFd; i++) {
 982     if ((acptr = LocalClientArray[i])) {
 983       assert(!IsMe(acptr));
 984       if (IsServer(acptr))
 985         det_confs_butmask(acptr, ~(CONF_UWORLD | CONF_ILLEGAL));
 986       /* Because admin's are getting so uppity about people managing to
 987        * get past K/G's etc, we'll "fix" the bug by actually explaining
 988        * whats going on.
 989        */
 990       if ((found_g = find_kill(acptr, 0))) {
 991         sendto_opmask_butone(0, found_g == -2 ? SNO_GLINE : SNO_OPERKILL,
 992                              found_g == -2 ? "G-line active for %s%s" :
 993                              "K-line active for %s%s",
 994                              IsUnknown(acptr) ? "Unregistered Client ":"",
 995                              get_client_name(acptr, SHOW_IP));
 996         if (exit_client(cptr, acptr, &me, found_g == -2 ? "G-lined" :
 997             "K-lined") == CPTR_KILLED)
 998           ret = CPTR_KILLED;
 999       }
1000     }
1001   }
1002
1003   attach_conf_uworld(&me);
1004
1005   return ret;
1006 }
1007
1008 /** Read configuration file for the very first time.
1009  * @return Non-zero on success, zero on failure.
1010  */
1011
1012 int init_conf(void)
1013 {
1014   if (read_configuration_file()) {
1015     /*
1016      * make sure we're sane to start if the config
1017      * file read didn't get everything we need.
1018      * XXX - should any of these abort the server?
1019      * TODO: add warning messages
1020      */
1021     if (0 == localConf.name || 0 == localConf.numeric)
1022       return 0;
1023     if (conf_error)
1024       return 0;
1025
1026     if (0 == localConf.location1)
1027       DupString(localConf.location1, "");
1028     if (0 == localConf.location2)
1029       DupString(localConf.location2, "");
1030     if (0 == localConf.contact)
1031       DupString(localConf.contact, "");
1032
1033     return 1;
1034   }
1035   return 0;
1036 }
1037
1038 /** Searches for a K/G-line for a client.  If one is found, notify the
1039  * user and disconnect them.
1040  * @param cptr Client to search for.
1041  * @param glinecheck Whether we check for glines.
1042  * @return 0 if client is accepted; -1 if client was locally denied
1043  * (K-line); -2 if client was globally denied (G-line).
1044  */
1045 int find_kill(struct Client *cptr, int glinecheck)
1046 {
1047   const char*      host;
1048   const char*      name;
1049   const char*      realname;
1050   struct DenyConf* deny;
1051   struct Gline*    agline = NULL;
1052
1053   assert(0 != cptr);
1054
1055   if (!cli_user(cptr))
1056     return 0;
1057
1058   host = cli_sockhost(cptr);
1059   name = cli_user(cptr)->username;
1060   realname = cli_info(cptr);
1061
1062   assert(strlen(host) <= HOSTLEN);
1063   assert((name ? strlen(name) : 0) <= HOSTLEN);
1064   assert((realname ? strlen(realname) : 0) <= REALLEN);
1065
1066   /* 2000-07-14: Rewrote this loop for massive speed increases.
1067    *             -- Isomer
1068    */
1069   for (deny = denyConfList; deny; deny = deny->next) {
1070     if (deny->usermask && match(deny->usermask, name))
1071       continue;
1072     if (deny->realmask && match(deny->realmask, realname))
1073       continue;
1074     if (deny->bits > 0) {
1075       if (!ipmask_check(&cli_ip(cptr), &deny->address, deny->bits))
1076         continue;
1077     } else if (deny->hostmask && match(deny->hostmask, host))
1078       continue;
1079
1080     if (EmptyString(deny->message))
1081       send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
1082                  ":Connection from your host is refused on this server.");
1083     else {
1084       if (deny->flags & DENY_FLAGS_FILE)
1085         killcomment(cptr, deny->message);
1086       else
1087         send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s.", deny->message);
1088     }
1089     return -1;
1090   }
1091
1092   /* added glinecheck to define if we check for glines too, shouldn't happen
1093    * when rehashing as it is causing problems with big servers and lots of glines.
1094    * Think of a 18000 user leaf with 18000 glines present, this will probably
1095    * cause the server to split from the net.
1096    * -skater_x
1097    */
1098   if (glinecheck && (agline = gline_lookup(cptr, 0)) && GlineIsActive(agline)) {
1099     /*
1100      * find active glines
1101      * added a check against the user's IP address to find_gline() -Kev
1102      */
1103     send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s.", GlineReason(agline));
1104     return -2;
1105   }
1106
1107   return 0;
1108 }
1109
1110 /** Attempt to attach Client blocks to \a cptr.  If attach_iline()
1111  * fails for the client, emit a debugging message.
1112  * @param cptr Client to check for access.
1113  * @return Access check result.
1114  */
1115 enum AuthorizationCheckResult conf_check_client(struct Client *cptr)
1116 {
1117   enum AuthorizationCheckResult acr = ACR_OK;
1118
1119   if ((acr = attach_iline(cptr))) {
1120     Debug((DEBUG_DNS, "ch_cl: access denied: %s[%s]",
1121           cli_name(cptr), cli_sockhost(cptr)));
1122     return acr;
1123   }
1124   return ACR_OK;
1125 }
1126
1127 /** Check access for a server given its name (passed in cptr struct).
1128  * Must check for all C/N lines which have a name which matches the
1129  * name given and a host which matches. A host alias which is the
1130  * same as the server name is also acceptable in the host field of a
1131  * C/N line.
1132  * @param cptr Peer server to check.
1133  * @return 0 if accepted, -1 if access denied.
1134  */
1135 int conf_check_server(struct Client *cptr)
1136 {
1137   struct ConfItem* c_conf = NULL;
1138   struct SLink*    lp;
1139
1140   Debug((DEBUG_DNS, "sv_cl: check access for %s[%s]",
1141         cli_name(cptr), cli_sockhost(cptr)));
1142
1143   if (IsUnknown(cptr) && !attach_confs_byname(cptr, cli_name(cptr), CONF_SERVER)) {
1144     Debug((DEBUG_DNS, "No C/N lines for %s", cli_sockhost(cptr)));
1145     return -1;
1146   }
1147   lp = cli_confs(cptr);
1148   /*
1149    * We initiated this connection so the client should have a C and N
1150    * line already attached after passing through the connect_server()
1151    * function earlier.
1152    */
1153   if (IsConnecting(cptr) || IsHandshake(cptr)) {
1154     c_conf = find_conf_byname(lp, cli_name(cptr), CONF_SERVER);
1155     if (!c_conf) {
1156       sendto_opmask_butone(0, SNO_OLDSNO,
1157                            "Connect Error: lost Connect block for %s",
1158                            cli_name(cptr));
1159       det_confs_butmask(cptr, 0);
1160       return -1;
1161     }
1162   }
1163
1164   /* Try finding the Connect block by DNS name and IP next. */
1165   if (!c_conf && !(c_conf = find_conf_byhost(lp, cli_sockhost(cptr), CONF_SERVER)))
1166         c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
1167
1168   /*
1169    * Attach by IP# only if all other checks have failed.
1170    * It is quite possible to get here with the strange things that can
1171    * happen when using DNS in the way the irc server does. -avalon
1172    */
1173   if (!c_conf)
1174     c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
1175   /*
1176    * detach all conf lines that got attached by attach_confs()
1177    */
1178   det_confs_butmask(cptr, 0);
1179   /*
1180    * if no Connect block, then deny access
1181    */
1182   if (!c_conf) {
1183     Debug((DEBUG_DNS, "sv_cl: access denied: %s[%s@%s]",
1184           cli_name(cptr), cli_username(cptr), cli_sockhost(cptr)));
1185     return -1;
1186   }
1187   /*
1188    * attach the Connect block to the client structure for later use.
1189    */
1190   attach_conf(cptr, c_conf);
1191
1192   if (!irc_in_addr_valid(&c_conf->address.addr))
1193     memcpy(&c_conf->address.addr, &cli_ip(cptr), sizeof(c_conf->address.addr));
1194
1195   Debug((DEBUG_DNS, "sv_cl: access ok: %s[%s]",
1196          cli_name(cptr), cli_sockhost(cptr)));
1197   return 0;
1198 }
1199
1200 void clear_slines(void)
1201 {
1202   struct sline *sline;
1203   while ((sline = GlobalSList)) {
1204     GlobalSList = sline->next;
1205     MyFree(sline->spoofhost);
1206     if (!EmptyString(sline->passwd))
1207       MyFree(sline->passwd);
1208     if (!EmptyString(sline->realhost))
1209       MyFree(sline->realhost);
1210     if (!EmptyString(sline->username))
1211       MyFree(sline->username);
1212     MyFree(sline);
1213   }
1214 }
1215
1216 /*
1217  * conf_check_slines()
1218  *
1219  * Check S lines for the specified client, passed in cptr struct.
1220  * If the client's IP is S-lined, process the substitution here.
1221  *
1222  * Precondition
1223  *  cptr != NULL
1224  *
1225  * Returns
1226  *  0 = No S-line found
1227  *  1 = S-line found and substitution done.
1228  *
1229  * -mbuna 9/2001
1230  * -froo 1/2003
1231  *
1232  */
1233
1234 int
1235 conf_check_slines(struct Client *cptr)
1236 {
1237   struct sline *sconf;
1238   char *hostonly;
1239
1240   for (sconf = GlobalSList; sconf; sconf = sconf->next) {
1241     if (sconf->flags == SLINE_FLAGS_IP) {
1242       if (!ipmask_check(&(cli_ip(cptr)), &(sconf->address), sconf->bits))
1243         continue;
1244     } else if (sconf->flags == SLINE_FLAGS_HOSTNAME) {
1245         if ((match(sconf->realhost, cli_sockhost(cptr)) != 0) &&
1246            (match(sconf->realhost, cli_sock_ip(cptr)) != 0))    /* wildcarded IP address */
1247           continue;
1248     } else {
1249         continue;
1250     }
1251
1252     if (match(sconf->username, cli_user(cptr)->username) == 0) {
1253      /* Ignore user part if u@h. */
1254      if ((hostonly = strchr(sconf->spoofhost, '@')))
1255         hostonly++;
1256       else
1257         hostonly = sconf->spoofhost;
1258
1259       if(!*hostonly)
1260         continue;
1261
1262       ircd_strncpy(cli_user(cptr)->host, hostonly, HOSTLEN);
1263       log_write(LS_USER, L_INFO, LOG_NOSNOTICE, "S-Line (%s@%s) by (%#R)",
1264           cli_user(cptr)->username, hostonly, cptr);
1265       return 1;
1266     }
1267   }
1268   return 0;
1269 }
1270
1271 void free_spoofhost(struct sline *spoof) {
1272         MyFree(spoof->spoofhost);
1273         MyFree(spoof->passwd);
1274         MyFree(spoof->realhost);
1275         MyFree(spoof->username);
1276         MyFree(spoof);
1277 }