2 * ircd-ratbox: A slightly useful ircd.
3 * m_server.c: Introduces a server.
5 * Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
6 * Copyright (C) 1996-2002 Hybrid Development Team
7 * Copyright (C) 2002-2005 ircd-ratbox development team
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
24 * $Id: m_server.c 3291 2007-03-28 14:30:10Z jilles $
28 #include "client.h" /* client struct */
29 #include "common.h" /* TRUE bleah */
30 #include "hash.h" /* add_to_client_hash */
32 #include "ircd.h" /* me */
33 #include "numeric.h" /* ERR_xxx */
34 #include "s_conf.h" /* struct ConfItem */
35 #include "s_newconf.h"
36 #include "logger.h" /* log level defines */
37 #include "s_serv.h" /* server_estab, check_server */
38 #include "s_stats.h" /* ServerStats */
40 #include "send.h" /* sendto_one */
45 static int mr_server(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
46 static int ms_server(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
47 static int ms_sid(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
49 struct Message server_msgtab
= {
50 "SERVER", 0, 0, 0, MFLG_SLOW
| MFLG_UNREG
,
51 {{mr_server
, 4}, mg_reg
, mg_ignore
, {ms_server
, 4}, mg_ignore
, mg_reg
}
53 struct Message sid_msgtab
= {
54 "SID", 0, 0, 0, MFLG_SLOW
,
55 {mg_ignore
, mg_reg
, mg_ignore
, {ms_sid
, 5}, mg_ignore
, mg_reg
}
58 mapi_clist_av1 server_clist
[] = { &server_msgtab
, &sid_msgtab
, NULL
};
60 DECLARE_MODULE_AV1(server
, NULL
, NULL
, server_clist
, NULL
, NULL
, "$Revision: 3291 $");
62 int bogus_host(const char *host
);
63 static int set_server_gecos(struct Client
*, const char *);
66 * mr_server - SERVER message handler
67 * parv[1] = servername
68 * parv[2] = serverinfo/hopcount
69 * parv[3] = serverinfo
72 mr_server(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
74 char info
[REALLEN
+ 1];
76 struct Client
*target_p
;
78 unsigned int required_mask
;
83 rb_strlcpy(info
, parv
[3], sizeof(info
));
85 if (IsHandshake(client_p
) && irccmp(client_p
->name
, name
))
87 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
88 "Server %s has unexpected name %s",
89 client_p
->name
, name
);
90 ilog(L_SERVER
, "Server %s has unexpected name %s",
91 log_client_name(client_p
, SHOW_IP
), name
);
92 exit_client(client_p
, client_p
, client_p
, "Server name mismatch");
97 * Reject a direct nonTS server connection if we're TS_ONLY -orabidoo
101 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Link %s dropped, non-TS server",
103 exit_client(client_p
, client_p
, client_p
, "Non-TS server");
109 exit_client(client_p
, client_p
, client_p
, "Bogus server name");
113 /* Now we just have to call check_server and everything should be
114 * check for us... -A1kmm. */
115 switch (check_server(name
, client_p
))
118 if(ConfigFileEntry
.warn_no_nline
)
120 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
121 "Unauthorised server connection attempt from %s: "
122 "No entry for servername %s",
123 "[@255.255.255.255]", name
);
125 ilog(L_SERVER
, "Access denied, no connect block for server %s%s",
126 EmptyString(client_p
->name
) ? name
: "",
127 log_client_name(client_p
, SHOW_IP
));
130 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
136 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
137 "Unauthorised server connection attempt from %s: "
138 "Bad credentials for server %s",
139 "[@255.255.255.255]", name
);
141 ilog(L_SERVER
, "Access denied, invalid credentials for server %s%s",
142 EmptyString(client_p
->name
) ? name
: "",
143 log_client_name(client_p
, SHOW_IP
));
145 exit_client(client_p
, client_p
, client_p
, "Invalid credentials.");
151 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
152 "Unauthorised server connection attempt from %s: "
153 "Invalid host for server %s",
154 "[@255.255.255.255]", name
);
156 ilog(L_SERVER
, "Access denied, invalid host for server %s%s",
157 EmptyString(client_p
->name
) ? name
: "",
158 log_client_name(client_p
, SHOW_IP
));
160 exit_client(client_p
, client_p
, client_p
, "Invalid host.");
165 /* servername is > HOSTLEN */
167 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
168 "Invalid servername %s from %s",
169 name
, "[@255.255.255.255]");
170 ilog(L_SERVER
, "Access denied, invalid servername from %s",
171 log_client_name(client_p
, SHOW_IP
));
173 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
178 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
179 "Connection from servername %s requires SSL/TLS but is plaintext",
181 ilog(L_SERVER
, "Access denied, requires SSL/TLS but is plaintext from %s",
182 log_client_name(client_p
, SHOW_IP
));
184 exit_client(client_p
, client_p
, client_p
, "Access denied, requires SSL/TLS but is plaintext");
188 /* require TS6 for direct links */
189 if(!IsCapable(client_p
, CAP_TS6
))
191 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
192 "Link %s dropped, TS6 protocol is required", name
);
193 exit_client(client_p
, client_p
, client_p
, "Incompatible TS version");
197 /* check to ensure any "required" caps are set. --nenolod */
198 required_mask
= capability_index_get_required(serv_capindex
);
199 if (!IsCapable(client_p
, required_mask
))
201 missing
= capability_index_list(serv_capindex
, required_mask
&
202 ~client_p
->localClient
->caps
);
203 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
204 "Link %s dropped, required CAPABs [%s] are missing",
206 ilog(L_SERVER
, "Link %s%s dropped, required CAPABs [%s] are missing",
207 EmptyString(client_p
->name
) ? name
: "",
208 log_client_name(client_p
, SHOW_IP
), missing
);
209 /* Do not use '[' in the below message because it would cause
210 * it to be considered potentially unsafe (might disclose IP
213 sendto_one(client_p
, "ERROR :Missing required CAPABs (%s)", missing
);
214 exit_client(client_p
, client_p
, client_p
, "Missing required CAPABs");
219 if((target_p
= find_server(NULL
, name
)))
222 * This link is trying feed me a server that I already have
223 * access through another path -- multiple paths not accepted
224 * currently, kill this link immediately!!
226 * Rather than KILL the link which introduced it, KILL the
227 * youngest of the two links. -avalon
229 * Definitely don't do that here. This is from an unregistered
232 if (target_p
->servptr
->flags
& FLAGS_SERVICE
)
234 /* Assume any servers introduced by services
238 sendto_one(client_p
, "ERROR :Server juped.");
242 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
243 "Attempt to re-introduce server %s from %s",
244 name
, "[@255.255.255.255]");
245 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
246 name
, log_client_name(client_p
, SHOW_IP
));
248 sendto_one(client_p
, "ERROR :Server already exists.");
250 exit_client(client_p
, client_p
, client_p
, "Server Exists");
254 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
256 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
257 "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
259 EmptyString(client_p
->name
) ? name
: "",
260 client_p
->name
, target_p
->name
);
261 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
263 EmptyString(client_p
->name
) ? name
: "",
264 log_client_name(client_p
, SHOW_IP
),
267 sendto_one(client_p
, "ERROR :SID already exists.");
268 exit_client(client_p
, client_p
, client_p
, "SID Exists");
273 * if we are connecting (Handshake), we already have the name from the
274 * C:line in client_p->name
277 rb_strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
278 set_server_gecos(client_p
, info
);
279 client_p
->hopcount
= hop
;
280 server_estab(client_p
);
286 * ms_server - SERVER message handler
287 * parv[1] = servername
288 * parv[2] = serverinfo/hopcount
289 * parv[3] = serverinfo
292 ms_server(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
294 char info
[REALLEN
+ 1];
295 /* same size as in s_misc.c */
297 struct Client
*target_p
;
298 struct remote_conf
*hub_p
;
299 hook_data_client hdata
;
304 char squitreason
[160];
308 rb_strlcpy(info
, parv
[3], sizeof(info
));
310 if(find_server(NULL
, name
))
313 * This link is trying feed me a server that I already have
314 * access through another path -- multiple paths not accepted
315 * currently, kill this link immediately!!
317 * Rather than KILL the link which introduced it, KILL the
318 * youngest of the two links. -avalon
320 * I think that we should exit the link itself, not the introducer,
321 * and we should always exit the most recently received(i.e. the
322 * one we are receiving this SERVER for. -A1kmm
324 * You *cant* do this, if you link somewhere, it bursts you a server
325 * that already exists, then sends you a client burst, you squit the
326 * server, but you keep getting the burst of clients on a server that
327 * doesnt exist, although ircd can handle it, its not a realistic
330 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
331 client_p
->name
, name
);
333 snprintf(squitreason
, sizeof squitreason
,
334 "Server %s already exists",
336 exit_client(client_p
, client_p
, &me
, squitreason
);
341 * User nicks never have '.' in them and server names
342 * must always have '.' in them.
344 if(strchr(name
, '.') == NULL
)
347 * Server trying to use the same name as a person. Would
348 * cause a fair bit of confusion. Enough to make it hellish
349 * for a while and servers to send stuff to the wrong place.
351 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
352 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
353 "Link %s cancelled: Server/nick collision on %s",
354 client_p
->name
, name
);
355 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
356 client_p
->name
, name
);
358 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
363 * Server is informing about a new server behind
364 * this link. Create REMOTE server structure,
365 * add it to list and propagate word to my other
370 * See if the newly found server is behind a guaranteed
371 * leaf. If so, close the link.
374 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
378 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
380 if(hub_p
->flags
& CONF_HUB
)
387 /* Ok, this way this works is
389 * A server can have a CONF_HUB allowing it to introduce servers
393 * name = "irc.bighub.net";
397 * That would allow "irc.bighub.net" to introduce anything it wanted..
402 * name = "irc.somehub.fi";
406 * Would allow this server in finland to hub anything but
410 /* Ok, check client_p can hub the new server */
413 /* OOOPs nope can't HUB */
414 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
415 client_p
->name
, name
);
416 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
417 client_p
->name
, name
);
419 snprintf(squitreason
, sizeof squitreason
,
420 "No matching hub_mask for %s",
422 exit_client(NULL
, client_p
, &me
, squitreason
);
426 /* Check for the new server being leafed behind this HUB */
429 /* OOOPs nope can't HUB this leaf */
430 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
431 "Link %s introduced leafed server %s.",
432 client_p
->name
, name
);
433 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
434 client_p
->name
, name
);
436 snprintf(squitreason
, sizeof squitreason
,
437 "Matching leaf_mask for %s",
439 exit_client(NULL
, client_p
, &me
, squitreason
);
445 if(strlen(name
) > HOSTLEN
)
447 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
448 "Link %s introduced server with invalid servername %s",
449 client_p
->name
, name
);
450 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
451 client_p
->name
, name
);
453 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
457 target_p
= make_client(client_p
);
458 make_server(target_p
);
459 target_p
->hopcount
= hop
;
461 rb_strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
463 set_server_gecos(target_p
, info
);
465 target_p
->servptr
= source_p
;
469 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
470 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
471 add_to_client_hash(target_p
->name
, target_p
);
472 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
474 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
476 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
477 ":%s SERVER %s %d :%s%s",
478 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
479 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
481 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
482 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
484 /* quick, dirty EOB. you know you love it. */
485 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
487 hdata
.client
= source_p
;
488 hdata
.target
= target_p
;
489 call_hook(h_server_introduced
, &hdata
);
495 ms_sid(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
497 struct Client
*target_p
;
498 struct remote_conf
*hub_p
;
499 hook_data_client hdata
;
503 char squitreason
[160];
505 /* collision on the name? */
506 if(find_server(NULL
, parv
[1]) != NULL
)
508 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
509 client_p
->name
, parv
[1]);
511 snprintf(squitreason
, sizeof squitreason
,
512 "Server %s already exists",
514 exit_client(NULL
, client_p
, &me
, squitreason
);
518 /* collision on the SID? */
519 if((target_p
= find_id(parv
[3])) != NULL
)
521 sendto_wallops_flags(UMODE_WALLOP
, &me
,
522 "Link %s cancelled, SID %s for server %s already in use by %s",
523 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
524 sendto_server(NULL
, NULL
, CAP_TS6
, NOCAPS
,
525 ":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
526 me
.id
, client_p
->name
, parv
[3], parv
[1], target_p
->name
);
527 ilog(L_SERVER
, "Link %s cancelled, SID %s for server %s already in use by %s",
528 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
530 snprintf(squitreason
, sizeof squitreason
,
531 "SID %s for %s already in use by %s",
532 parv
[3], parv
[1], target_p
->name
);
533 exit_client(NULL
, client_p
, &me
, squitreason
);
537 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
539 sendto_one(client_p
, "ERROR :Invalid servername");
540 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
541 "Link %s cancelled, servername %s invalid",
542 client_p
->name
, parv
[1]);
543 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
544 client_p
->name
, parv
[1]);
546 exit_client(NULL
, client_p
, &me
, "Bogus server name");
550 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
551 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
553 sendto_one(client_p
, "ERROR :Invalid SID");
554 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
555 "Link %s cancelled, SID %s invalid",
556 client_p
->name
, parv
[3]);
557 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
558 client_p
->name
, parv
[3]);
560 exit_client(NULL
, client_p
, &me
, "Bogus SID");
564 /* for the directly connected server:
565 * H: allows it to introduce a server matching that mask
566 * L: disallows it introducing a server matching that mask
568 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
572 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
574 if(hub_p
->flags
& CONF_HUB
)
581 /* no matching hub_mask */
584 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
585 "Non-Hub link %s introduced %s.",
586 client_p
->name
, parv
[1]);
587 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
588 client_p
->name
, parv
[1]);
590 snprintf(squitreason
, sizeof squitreason
,
591 "No matching hub_mask for %s",
593 exit_client(NULL
, client_p
, &me
, squitreason
);
597 /* matching leaf_mask */
600 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
601 "Link %s introduced leafed server %s.",
602 client_p
->name
, parv
[1]);
603 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
604 client_p
->name
, parv
[1]);
606 snprintf(squitreason
, sizeof squitreason
,
607 "Matching leaf_mask for %s",
609 exit_client(NULL
, client_p
, &me
, squitreason
);
614 target_p
= make_client(client_p
);
615 make_server(target_p
);
617 rb_strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
618 target_p
->hopcount
= atoi(parv
[2]);
619 strcpy(target_p
->id
, parv
[3]);
620 set_server_gecos(target_p
, parv
[4]);
622 target_p
->servptr
= source_p
;
625 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
626 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
627 add_to_client_hash(target_p
->name
, target_p
);
628 add_to_id_hash(target_p
->id
, target_p
);
629 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
631 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
633 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
634 ":%s SID %s %d %s :%s%s",
635 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
636 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
638 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
639 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
641 /* quick, dirty EOB. you know you love it. */
642 sendto_one(target_p
, ":%s PING %s %s",
643 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
645 hdata
.client
= source_p
;
646 hdata
.target
= target_p
;
647 call_hook(h_server_introduced
, &hdata
);
652 /* set_server_gecos()
654 * input - pointer to client
656 * side effects - servers gecos field is set
659 set_server_gecos(struct Client
*client_p
, const char *info
)
661 /* check the info for [IP] */
667 s
= LOCAL_COPY(info
);
669 /* we should only check the first word for an ip */
670 if((p
= strchr(s
, ' ')))
673 /* check for a ] which would symbolise an [IP] */
676 /* set s to after the first space */
682 /* no ], put the space back */
686 /* p may have been set to a trailing space, so check s exists and that
688 if(s
&& (*s
!= '\0'))
690 /* a space? if not (H) could be the last part of info.. */
691 if((p
= strchr(s
, ' ')))
694 /* check for (H) which is a hidden server */
695 if(!strcmp(s
, "(H)"))
699 /* if there was no space.. theres nothing to set info to */
708 /* if there was a trailing space, s could point to \0, so check */
709 if(s
&& (*s
!= '\0'))
711 rb_strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
717 rb_strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
726 * output - 1 if a bogus hostname input, 0 if its valid
727 * side effects - none
730 bogus_host(const char *host
)
732 int bogus_server
= 0;
736 for(s
= host
; *s
; s
++)
747 if(!dots
|| bogus_server
)