2 * IRC - Internet Relay Chat, ircd/s_conf.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
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)
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.
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.
21 * @brief ircd configuration file driver
31 #include "ircd_features.h"
36 #include "ircd_alloc.h"
37 #include "ircd_auth.h"
38 #include "ircd_chattr.h"
40 #include "ircd_reply.h"
41 #include "ircd_snprintf.h"
42 #include "ircd_string.h"
60 #include <arpa/inet.h>
70 /** Global list of all ConfItem structures. */
71 struct ConfItem *GlobalConfList;
72 /** Count of items in #GlobalConfList. */
74 /** Global list of service mappings. */
75 struct s_map *GlobalServiceMapList;
76 /** Global list of channel quarantines. */
77 struct qline *GlobalQuarantineList;
79 /** Current line number in scanner input. */
82 /** Configuration information for #me. */
83 struct LocalConf localConf;
84 /** Global list of connection rules. */
85 struct CRuleConf* cruleConfList;
86 /** Global list of K-lines. */
87 struct DenyConf* denyConfList;
89 /** Tell a user that they are banned, dumping the message from a file.
90 * @param sptr Client being rejected
91 * @param filename Send this file's contents to \a sptr
93 static void killcomment(struct Client* sptr, const char* filename)
100 if (NULL == (file = fbopen(filename, "r"))) {
101 send_reply(sptr, ERR_NOMOTD);
102 send_reply(sptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
103 ":Connection from your host is refused on this server.");
107 tm = localtime((time_t*) &sb.st_mtime); /* NetBSD needs cast */
108 while (fbgets(line, sizeof(line) - 1, file)) {
109 char* end = line + strlen(line);
112 if ('\n' == *end || '\r' == *end)
117 send_reply(sptr, RPL_MOTD, line);
119 send_reply(sptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
120 ":Connection from your host is refused on this server.");
124 /** Allocate a new struct ConfItem and link it to #GlobalConfList.
125 * @return Newly allocated structure.
127 struct ConfItem* make_conf(int type)
129 struct ConfItem* aconf;
131 aconf = (struct ConfItem*) MyMalloc(sizeof(struct ConfItem));
136 memset(aconf, 0, sizeof(struct ConfItem));
137 aconf->status = type;
138 aconf->next = GlobalConfList;
139 GlobalConfList = aconf;
143 /** Free a struct ConfItem and any resources it owns.
144 * @param aconf Item to free.
146 void free_conf(struct ConfItem *aconf)
148 Debug((DEBUG_DEBUG, "free_conf: %s %s %d",
149 aconf->host ? aconf->host : "*",
150 aconf->name ? aconf->name : "*",
151 aconf->address.port));
152 if (aconf->dns_pending)
153 delete_resolver_queries(aconf);
156 memset(aconf->passwd, 0, strlen(aconf->passwd));
157 MyFree(aconf->passwd);
165 /** Disassociate configuration from the client.
166 * @param cptr Client to operate on.
167 * @param aconf ConfItem to detach.
169 static void detach_conf(struct Client* cptr, struct ConfItem* aconf)
176 assert(0 < aconf->clients);
178 lp = &(cli_confs(cptr));
181 if ((*lp)->value.aconf == aconf) {
182 if (aconf->conn_class && (aconf->status & CONF_CLIENT_MASK) && ConfLinks(aconf) > 0)
185 assert(0 < aconf->clients);
186 if (0 == --aconf->clients && IsIllegal(aconf))
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.
205 void conf_parse_userhost(struct ConfItem *aconf, char *host)
208 unsigned char addrbits;
210 MyFree(aconf->username);
212 host_part = strchr(host, '@');
215 DupString(aconf->username, host);
218 aconf->username = NULL;
221 DupString(aconf->host, host_part);
222 if (ipmask_parse(aconf->host, &aconf->address.addr, &addrbits))
223 aconf->addrbits = addrbits;
225 aconf->addrbits = -1;
229 /** Copies a completed DNS query into its ConfItem.
230 * @param vptr Pointer to struct ConfItem for the block.
231 * @param hp DNS reply, or NULL if the lookup failed.
233 static void conf_dns_callback(void* vptr, struct DNSReply* hp)
235 struct ConfItem* aconf = (struct ConfItem*) vptr;
237 aconf->dns_pending = 0;
239 memcpy(&aconf->address.addr, &hp->addr, sizeof(aconf->address.addr));
244 /** Start a nameserver lookup of the conf host. If the conf entry is
245 * currently doing a lookup, do nothing.
246 * @param aconf ConfItem for which to start a request.
248 static void conf_dns_lookup(struct ConfItem* aconf)
250 if (!aconf->dns_pending) {
251 char buf[HOSTLEN + 1];
252 struct DNSQuery query;
254 query.callback = conf_dns_callback;
255 host_from_uh(buf, aconf->host, HOSTLEN);
258 gethost_byname(buf, &query);
259 aconf->dns_pending = 1;
264 /** Start lookups of all addresses in the conf line. The origin must
265 * be a numeric IP address. If the remote host field is not an IP
266 * address, start a DNS lookup for it.
267 * @param aconf Connection to do lookups for.
270 lookup_confhost(struct ConfItem *aconf)
272 if (EmptyString(aconf->host) || EmptyString(aconf->name)) {
273 Debug((DEBUG_ERROR, "Host/server name error: (%s) (%s)",
274 aconf->host, aconf->name));
277 if (aconf->origin_name
278 && !ircd_aton(&aconf->origin.addr, aconf->origin_name)) {
279 Debug((DEBUG_ERROR, "Origin name error: (%s) (%s)",
280 aconf->origin_name, aconf->name));
283 * Do name lookup now on hostnames given and store the
284 * ip numbers in conf structure.
286 if (IsIP6Char(*aconf->host)) {
287 if (!ircd_aton(&aconf->address.addr, aconf->host)) {
288 Debug((DEBUG_ERROR, "Host/server name error: (%s) (%s)",
289 aconf->host, aconf->name));
293 conf_dns_lookup(aconf);
296 /** Find a server by name or hostname.
297 * @param name Server name to find.
298 * @return Pointer to the corresponding ConfItem, or NULL if none exists.
300 struct ConfItem* conf_find_server(const char* name)
302 struct ConfItem* conf;
305 for (conf = GlobalConfList; conf; conf = conf->next) {
306 if (CONF_SERVER == conf->status) {
308 * Check first servernames, then try hostnames.
309 * XXX - match returns 0 if there _is_ a match... guess they
310 * haven't decided what true is yet
312 if (0 == match(name, conf->name))
319 /** Evaluate connection rules.
320 * @param name Name of server to check
321 * @param mask Filter for CRule types (only consider if type & \a mask != 0).
322 * @return Name of rule that forbids the connection; NULL if no prohibitions.
324 const char* conf_eval_crule(const char* name, int mask)
326 struct CRuleConf* p = cruleConfList;
329 for ( ; p; p = p->next) {
330 if (0 != (p->type & mask) && 0 == match(p->hostmask, name)) {
331 if (crule_eval(p->node))
338 /** Remove all conf entries from the client except those which match
339 * the status field mask.
340 * @param cptr Client to operate on.
341 * @param mask ConfItem types to keep.
343 void det_confs_butmask(struct Client* cptr, int mask)
349 for (link = cli_confs(cptr); link; link = next) {
351 if ((link->value.aconf->status & mask) == 0)
352 detach_conf(cptr, link->value.aconf);
356 /** Check client limits and attach Client block.
357 * If there are more connections from the IP than \a aconf->maximum
358 * allows, return ACR_TOO_MANY_FROM_IP. Otherwise, attach \a aconf to
360 * @param cptr Client getting \a aconf.
361 * @param aconf Configuration item to attach.
362 * @return Authorization check result.
364 static enum AuthorizationCheckResult
365 check_limit_and_attach(struct Client* cptr, struct ConfItem* aconf)
367 if (IPcheck_nr(cptr) > aconf->maximum)
368 return ACR_TOO_MANY_FROM_IP;
369 return attach_conf(cptr, aconf);
372 /** Find the first (best) Client block to attach.
373 * @param cptr Client for whom to check rules.
374 * @return Authorization check result.
376 enum AuthorizationCheckResult attach_iline(struct Client* cptr)
378 struct ConfItem* aconf;
383 hp = cli_dns_reply(cptr);
384 for (aconf = GlobalConfList; aconf; aconf = aconf->next) {
385 if (aconf->status != CONF_CLIENT || !aconf->host)
387 if (aconf->address.port && aconf->address.port != cli_listener(cptr)->addr.port)
389 if (aconf->username) {
390 SetFlag(cptr, FLAG_DOID);
391 if (match(aconf->username, cli_username(cptr)))
395 Debug((DEBUG_DNS, "a_il: %s->%s", cli_sockhost(cptr), hp->h_name));
396 if (!match(aconf->host, hp->h_name))
397 return check_limit_and_attach(cptr, aconf);
399 if ((aconf->addrbits >= 0)
400 && ipmask_check(&cli_ip(cptr), &aconf->address.addr, aconf->addrbits))
401 return check_limit_and_attach(cptr, aconf);
403 return ACR_NO_AUTHORIZATION;
406 /** Check whether a particular ConfItem is already attached to a
408 * @param aconf ConfItem to search for
409 * @param cptr Client to check
410 * @return Non-zero if \a aconf is attached to \a cptr, zero if not.
412 static int is_attached(struct ConfItem *aconf, struct Client *cptr)
416 for (lp = cli_confs(cptr); lp; lp = lp->next) {
417 if (lp->value.aconf == aconf)
423 /** Associate a specific configuration entry to a *local* client (this
424 * is the one which used in accepting the connection). Note, that this
425 * automaticly changes the attachment if there was an old one...
426 * @param cptr Client to attach \a aconf to
427 * @param aconf ConfItem to attach
428 * @return Authorization check result.
430 enum AuthorizationCheckResult attach_conf(struct Client *cptr, struct ConfItem *aconf)
434 if (is_attached(aconf, cptr))
435 return ACR_ALREADY_AUTHORIZED;
436 if (IsIllegal(aconf))
437 return ACR_NO_AUTHORIZATION;
438 if ((aconf->status & (CONF_OPERATOR | CONF_CLIENT)) &&
439 ConfLinks(aconf) >= ConfMaxLinks(aconf) && ConfMaxLinks(aconf) > 0)
440 return ACR_TOO_MANY_IN_CLASS; /* Use this for printing error message */
442 lp->next = cli_confs(cptr);
443 lp->value.aconf = aconf;
444 cli_confs(cptr) = lp;
446 if (aconf->status & CONF_CLIENT_MASK)
451 /** Return our LocalConf configuration structure.
452 * @return A pointer to #localConf.
454 const struct LocalConf* conf_get_local(void)
459 /** Attach ConfItems to a client if the name passed matches that for
460 * the ConfItems or is an exact match for them.
461 * @param cptr Client getting the ConfItem attachments.
462 * @param name Filter to match ConfItem::name.
463 * @param statmask Filter to limit ConfItem::status.
464 * @return First ConfItem attached to \a cptr.
466 struct ConfItem* attach_confs_byname(struct Client* cptr, const char* name,
469 struct ConfItem* tmp;
470 struct ConfItem* first = NULL;
474 if (HOSTLEN < strlen(name))
477 for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
478 if (0 != (tmp->status & statmask) && !IsIllegal(tmp)) {
479 assert(0 != tmp->name);
480 if (0 == match(tmp->name, name) || 0 == ircd_strcmp(tmp->name, name)) {
481 if (ACR_OK == attach_conf(cptr, tmp) && !first)
489 /** Attach ConfItems to a client if the host passed matches that for
490 * the ConfItems or is an exact match for them.
491 * @param cptr Client getting the ConfItem attachments.
492 * @param host Filter to match ConfItem::host.
493 * @param statmask Filter to limit ConfItem::status.
494 * @return First ConfItem attached to \a cptr.
496 struct ConfItem* attach_confs_byhost(struct Client* cptr, const char* host,
499 struct ConfItem* tmp;
500 struct ConfItem* first = 0;
503 if (HOSTLEN < strlen(host))
506 for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
507 if (0 != (tmp->status & statmask) && !IsIllegal(tmp)) {
508 assert(0 != tmp->host);
509 if (0 == match(tmp->host, host) || 0 == ircd_strcmp(tmp->host, host)) {
510 if (ACR_OK == attach_conf(cptr, tmp) && !first)
518 /** Find a ConfItem that has the same name and user+host fields as
519 * specified. Requires an exact match for \a name.
520 * @param name Name to match
521 * @param cptr Client to match against
522 * @param statmask Filter for ConfItem::status
523 * @return First found matching ConfItem.
525 struct ConfItem* find_conf_exact(const char* name, struct Client *cptr, int statmask)
527 struct ConfItem *tmp;
529 for (tmp = GlobalConfList; tmp; tmp = tmp->next) {
530 if (!(tmp->status & statmask) || !tmp->name || !tmp->host ||
531 0 != ircd_strcmp(tmp->name, name))
534 && (EmptyString(cli_username(cptr))
535 || match(tmp->username, cli_username(cptr))))
537 if (tmp->addrbits < 0)
539 if (match(tmp->host, cli_sockhost(cptr)))
542 else if (!ipmask_check(&cli_ip(cptr), &tmp->address.addr, tmp->addrbits))
544 if ((tmp->status & CONF_OPERATOR)
545 && (tmp->clients >= MaxLinks(tmp->conn_class)))
552 /** Find a ConfItem from a list that has a name that matches \a name.
553 * @param lp List to search in.
554 * @param name Filter for ConfItem::name field; matches either exactly
556 * @param statmask Filter for ConfItem::status.
557 * @return First matching ConfItem from \a lp.
559 struct ConfItem* find_conf_byname(struct SLink* lp, const char* name,
562 struct ConfItem* tmp;
565 if (HOSTLEN < strlen(name))
568 for (; lp; lp = lp->next) {
569 tmp = lp->value.aconf;
570 if (0 != (tmp->status & statmask)) {
571 assert(0 != tmp->name);
572 if (0 == ircd_strcmp(tmp->name, name) || 0 == match(tmp->name, name))
579 /** Find a ConfItem from a list that has a host that matches \a host.
580 * @param lp List to search in.
581 * @param host Filter for ConfItem::host field; matches as a glob.
582 * @param statmask Filter for ConfItem::status.
583 * @return First matching ConfItem from \a lp.
585 struct ConfItem* find_conf_byhost(struct SLink* lp, const char* host,
588 struct ConfItem* tmp = NULL;
591 if (HOSTLEN < strlen(host))
594 for (; lp; lp = lp->next) {
595 tmp = lp->value.aconf;
596 if (0 != (tmp->status & statmask)) {
597 assert(0 != tmp->host);
598 if (0 == match(tmp->host, host))
605 /** Find a ConfItem from a list that has an address equal to \a ip.
606 * @param lp List to search in.
607 * @param ip Filter for ConfItem::address field; matches exactly.
608 * @param statmask Filter for ConfItem::status.
609 * @return First matching ConfItem from \a lp.
611 struct ConfItem* find_conf_byip(struct SLink* lp, const struct irc_in_addr* ip,
614 struct ConfItem* tmp;
616 for (; lp; lp = lp->next) {
617 tmp = lp->value.aconf;
618 if (0 != (tmp->status & statmask)
619 && !irc_in_addr_cmp(&tmp->address.addr, ip))
625 /** Free all CRules from #cruleConfList. */
626 void conf_erase_crule_list(void)
628 struct CRuleConf* next;
629 struct CRuleConf* p = cruleConfList;
631 for ( ; p; p = next) {
633 crule_free(&p->node);
641 /** Return #cruleConfList.
642 * @return #cruleConfList
644 const struct CRuleConf* conf_get_crule_list(void)
646 return cruleConfList;
649 /** Free all deny rules from #denyConfList. */
650 void conf_erase_deny_list(void)
652 struct DenyConf* next;
653 struct DenyConf* p = denyConfList;
654 for ( ; p; p = next) {
664 /** Return #denyConfList.
665 * @return #denyConfList
667 const struct DenyConf* conf_get_deny_list(void)
672 /** Find any existing quarantine for the named channel.
673 * @param chname Channel name to search for.
674 * @return Reason for channel's quarantine, or NULL if none exists.
677 find_quarantine(const char *chname)
681 for (qline = GlobalQuarantineList; qline; qline = qline->next)
682 if (!ircd_strcmp(qline->chname, chname))
683 return qline->reason;
687 /** Free all qline structs from #GlobalQuarantineList. */
688 void clear_quarantines(void)
691 while ((qline = GlobalQuarantineList))
693 GlobalQuarantineList = qline->next;
694 MyFree(qline->reason);
695 MyFree(qline->chname);
700 /** When non-zero, indicates that a configuration error has been seen in this pass. */
701 static int conf_error;
702 /** When non-zero, indicates that the configuration file was loaded at least once. */
703 static int conf_already_read;
705 extern void yyparse(void);
706 extern void init_lexer(void);
708 /** Read configuration file.
709 * @return Zero on failure, non-zero on success. */
710 int read_configuration_file(void)
713 feature_unmark(); /* unmark all features for resetting later */
714 /* Now just open an fd. The buffering isn't really needed... */
719 feature_mark(); /* reset unmarked features */
720 conf_already_read = 1;
724 /** Report an error message about the configuration file.
725 * @param msg The error to report.
728 yyerror(const char *msg)
730 sendto_opmask_butone(0, SNO_ALL, "Config file parse error line %d: %s",
732 log_write(LS_CONFIG, L_ERROR, 0, "Config file parse error line %d: %s",
734 if (!conf_already_read)
735 fprintf(stderr, "Config file parse error line %d: %s\n", lineno, msg);
739 /** Reload the configuration file.
740 * @param cptr Client that requested rehash (if a signal, &me).
741 * @param sig Type of rehash (0 = oper-requested, 1 = signal, 2 =
742 * oper-requested but do not restart resolver)
743 * @return CPTR_KILLED if any client was K/G-lined because of the
744 * rehash; otherwise 0.
746 int rehash(struct Client *cptr, int sig)
748 struct ConfItem** tmp = &GlobalConfList;
749 struct ConfItem* tmp2;
750 struct Client* acptr;
756 sendto_opmask_butone(0, SNO_OLDSNO,
757 "Got signal SIGHUP, reloading ircd conf. file");
759 while ((tmp2 = *tmp)) {
762 * Configuration entry is still in use by some
763 * local clients, cannot delete it--mark it so
764 * that it will be deleted when the last client
767 if (CONF_CLIENT == (tmp2->status & CONF_CLIENT))
773 tmp2->status |= CONF_ILLEGAL;
780 conf_erase_crule_list();
781 conf_erase_deny_list();
785 * delete the juped nicks list
795 mark_listeners_closing();
796 iauth_mark_closing();
798 read_configuration_file();
800 log_reopen(); /* reopen log files */
802 iauth_close_unused();
804 class_delete_marked(); /* unless it fails */
807 * Flush out deleted I and P lines although still in use.
809 for (tmp = &GlobalConfList; (tmp2 = *tmp);) {
810 if (CONF_ILLEGAL == (tmp2->status & CONF_ILLEGAL)) {
820 for (i = 0; i <= HighestFd; i++) {
821 if ((acptr = LocalClientArray[i])) {
822 assert(!IsMe(acptr));
823 if (IsServer(acptr)) {
824 det_confs_butmask(acptr, ~(CONF_UWORLD | CONF_ILLEGAL));
825 attach_confs_byname(acptr, cli_name(acptr), CONF_UWORLD);
827 /* Because admin's are getting so uppity about people managing to
828 * get past K/G's etc, we'll "fix" the bug by actually explaining
831 if ((found_g = find_kill(acptr))) {
832 sendto_opmask_butone(0, found_g == -2 ? SNO_GLINE : SNO_OPERKILL,
833 found_g == -2 ? "G-line active for %s%s" :
834 "K-line active for %s%s",
835 IsUnknown(acptr) ? "Unregistered Client ":"",
836 get_client_name(acptr, SHOW_IP));
837 if (exit_client(cptr, acptr, &me, found_g == -2 ? "G-lined" :
838 "K-lined") == CPTR_KILLED)
847 /** Read configuration file for the very first time.
848 * @return Non-zero on success, zero on failure.
853 if (read_configuration_file()) {
855 * make sure we're sane to start if the config
856 * file read didn't get everything we need.
857 * XXX - should any of these abort the server?
858 * TODO: add warning messages
860 if (0 == localConf.name || 0 == localConf.numeric)
865 if (0 == localConf.location1)
866 DupString(localConf.location1, "");
867 if (0 == localConf.location2)
868 DupString(localConf.location2, "");
869 if (0 == localConf.contact)
870 DupString(localConf.contact, "");
877 /** Searches for a K/G-line for a client. If one is found, notify the
878 * user and disconnect them.
879 * @param cptr Client to search for.
880 * @return 0 if client is accepted; -1 if client was locally denied
881 * (K-line); -2 if client was globally denied (G-line).
883 int find_kill(struct Client *cptr)
887 const char* realname;
888 struct DenyConf* deny;
889 struct Gline* agline = NULL;
896 host = cli_sockhost(cptr);
897 name = cli_user(cptr)->username;
898 realname = cli_info(cptr);
900 assert(strlen(host) <= HOSTLEN);
901 assert((name ? strlen(name) : 0) <= HOSTLEN);
902 assert((realname ? strlen(realname) : 0) <= REALLEN);
904 /* 2000-07-14: Rewrote this loop for massive speed increases.
907 for (deny = denyConfList; deny; deny = deny->next) {
908 if (0 != match(deny->usermask, name))
911 if (EmptyString(deny->hostmask))
914 if (deny->flags & DENY_FLAGS_REALNAME) { /* K: by real name */
915 if (0 == match(deny->hostmask + 2, realname))
917 } else if (deny->flags & DENY_FLAGS_IP) { /* k: by IP */
919 char tbuf1[SOCKIPLEN], tbuf2[SOCKIPLEN];
920 Debug((DEBUG_DEBUG, "ip: %s network: %s/%u",
921 ircd_ntoa_r(tbuf1, &cli_ip(cptr)), ircd_ntoa_r(tbuf2, &deny->address), deny->bits));
923 if (ipmask_check(&cli_ip(cptr), &deny->address, deny->bits))
926 else if (0 == match(deny->hostmask, host))
930 if (EmptyString(deny->message))
931 send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP,
932 ":Connection from your host is refused on this server.");
934 if (deny->flags & DENY_FLAGS_FILE)
935 killcomment(cptr, deny->message);
937 send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s.", deny->message);
940 else if ((agline = gline_lookup(cptr, 0))) {
943 * added a check against the user's IP address to find_gline() -Kev
945 send_reply(cptr, SND_EXPLICIT | ERR_YOUREBANNEDCREEP, ":%s.", GlineReason(agline));
956 /** Attempt to attach Client blocks to \a cptr. If attach_iline()
957 * fails for the client, emit a debugging message.
958 * @param cptr Client to check for access.
959 * @return Access check result.
961 enum AuthorizationCheckResult conf_check_client(struct Client *cptr)
963 enum AuthorizationCheckResult acr = ACR_OK;
965 if ((acr = attach_iline(cptr))) {
966 Debug((DEBUG_DNS, "ch_cl: access denied: %s[%s]",
967 cli_name(cptr), cli_sockhost(cptr)));
973 /** Check access for a server given its name (passed in cptr struct).
974 * Must check for all C/N lines which have a name which matches the
975 * name given and a host which matches. A host alias which is the
976 * same as the server name is also acceptable in the host field of a
978 * @param cptr Peer server to check.
979 * @return 0 if accepted, -1 if access denied.
981 int conf_check_server(struct Client *cptr)
983 struct ConfItem* c_conf = NULL;
986 Debug((DEBUG_DNS, "sv_cl: check access for %s[%s]",
987 cli_name(cptr), cli_sockhost(cptr)));
989 if (IsUnknown(cptr) && !attach_confs_byname(cptr, cli_name(cptr), CONF_SERVER)) {
990 Debug((DEBUG_DNS, "No C/N lines for %s", cli_sockhost(cptr)));
993 lp = cli_confs(cptr);
995 * We initiated this connection so the client should have a C and N
996 * line already attached after passing through the connect_server()
999 if (IsConnecting(cptr) || IsHandshake(cptr)) {
1000 c_conf = find_conf_byname(lp, cli_name(cptr), CONF_SERVER);
1002 sendto_opmask_butone(0, SNO_OLDSNO, "Connect Error: lost C:line for %s",
1004 det_confs_butmask(cptr, 0);
1010 if (cli_dns_reply(cptr)) {
1011 struct DNSReply* hp = cli_dns_reply(cptr);
1012 const char* name = hp->h_name;
1014 * If we are missing a C or N line from above, search for
1015 * it under all known hostnames we have for this ip#.
1017 if ((c_conf = find_conf_byhost(lp, hp->h_name, CONF_SERVER)))
1018 ircd_strncpy(cli_sockhost(cptr), name, HOSTLEN);
1020 c_conf = find_conf_byip(lp, &hp->addr, CONF_SERVER);
1024 * Check for C lines with the hostname portion the ip number
1025 * of the host the server runs on. This also checks the case where
1026 * there is a server connecting from 'localhost'.
1028 c_conf = find_conf_byhost(lp, cli_sockhost(cptr), CONF_SERVER);
1032 * Attach by IP# only if all other checks have failed.
1033 * It is quite possible to get here with the strange things that can
1034 * happen when using DNS in the way the irc server does. -avalon
1037 c_conf = find_conf_byip(lp, &cli_ip(cptr), CONF_SERVER);
1039 * detach all conf lines that got attached by attach_confs()
1041 det_confs_butmask(cptr, 0);
1043 * if no Connect block, then deny access
1046 Debug((DEBUG_DNS, "sv_cl: access denied: %s[%s@%s]",
1047 cli_name(cptr), cli_username(cptr), cli_sockhost(cptr)));
1051 * attach the Connect block to the client structure for later use.
1053 attach_conf(cptr, c_conf);
1054 attach_confs_byname(cptr, cli_name(cptr), CONF_UWORLD);
1056 if (!irc_in_addr_valid(&c_conf->address.addr))
1057 memcpy(&c_conf->address.addr, &cli_ip(cptr), sizeof(c_conf->address.addr));
1059 Debug((DEBUG_DNS, "sv_cl: access ok: %s[%s]",
1060 cli_name(cptr), cli_sockhost(cptr)));