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 */
31 #include "irc_string.h"
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 Client
*, struct Client
*, int, const char **);
46 static int ms_server(struct Client
*, struct Client
*, int, const char **);
47 static int ms_sid(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[0] = sender prefix
68 * parv[1] = servername
69 * parv[2] = serverinfo/hopcount
70 * parv[3] = serverinfo
73 mr_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
75 char info
[REALLEN
+ 1];
77 struct Client
*target_p
;
82 strlcpy(info
, parv
[3], sizeof(info
));
84 if (IsHandshake(client_p
) && irccmp(client_p
->name
, name
))
86 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
87 "Server %s has unexpected name %s",
88 get_server_name(client_p
, HIDE_IP
), name
);
89 ilog(L_SERVER
, "Server %s has unexpected name %s",
90 log_client_name(client_p
, SHOW_IP
), name
);
91 exit_client(client_p
, client_p
, client_p
, "Server name mismatch");
96 * Reject a direct nonTS server connection if we're TS_ONLY -orabidoo
100 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Link %s dropped, non-TS server",
101 get_server_name(client_p
, HIDE_IP
));
102 exit_client(client_p
, client_p
, client_p
, "Non-TS server");
108 exit_client(client_p
, client_p
, client_p
, "Bogus server name");
112 /* Now we just have to call check_server and everything should be
113 * check for us... -A1kmm. */
114 switch (check_server(name
, client_p
))
117 if(ConfigFileEntry
.warn_no_nline
)
119 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
120 "Unauthorised server connection attempt from %s: "
121 "No entry for servername %s",
122 get_server_name(client_p
, HIDE_IP
), name
);
124 ilog(L_SERVER
, "Access denied, no connect block for server %s%s",
125 EmptyString(client_p
->name
) ? name
: "",
126 log_client_name(client_p
, SHOW_IP
));
129 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
135 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
136 "Unauthorised server connection attempt from %s: "
137 "Bad password for server %s",
138 get_server_name(client_p
, HIDE_IP
), name
);
140 ilog(L_SERVER
, "Access denied, invalid password for server %s%s",
141 EmptyString(client_p
->name
) ? name
: "",
142 log_client_name(client_p
, SHOW_IP
));
144 exit_client(client_p
, client_p
, client_p
, "Invalid password.");
150 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
151 "Unauthorised server connection attempt from %s: "
152 "Invalid host for server %s",
153 get_server_name(client_p
, HIDE_IP
), name
);
155 ilog(L_SERVER
, "Access denied, invalid host for server %s%s",
156 EmptyString(client_p
->name
) ? name
: "",
157 log_client_name(client_p
, SHOW_IP
));
159 exit_client(client_p
, client_p
, client_p
, "Invalid host.");
164 /* servername is > HOSTLEN */
166 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
167 "Invalid servername %s from %s",
168 name
, get_server_name(client_p
, HIDE_IP
));
169 ilog(L_SERVER
, "Access denied, invalid servername from %s",
170 log_client_name(client_p
, SHOW_IP
));
172 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
177 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
178 "Connection from servername %s requires SSL/TLS but is plaintext",
180 ilog(L_SERVER
, "Access denied, requires SSL/TLS but is plaintext from %s",
181 log_client_name(client_p
, SHOW_IP
));
183 exit_client(client_p
, client_p
, client_p
, "Access denied, requires SSL/TLS but is plaintext");
187 if((target_p
= find_server(NULL
, name
)))
190 * This link is trying feed me a server that I already have
191 * access through another path -- multiple paths not accepted
192 * currently, kill this link immediately!!
194 * Rather than KILL the link which introduced it, KILL the
195 * youngest of the two links. -avalon
197 * Definitely don't do that here. This is from an unregistered
200 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
201 "Attempt to re-introduce server %s from %s",
202 name
, get_server_name(client_p
, HIDE_IP
));
203 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
204 name
, log_client_name(client_p
, SHOW_IP
));
206 sendto_one(client_p
, "ERROR :Server already exists.");
207 exit_client(client_p
, client_p
, client_p
, "Server Exists");
211 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
213 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
214 "Attempt to re-introduce SID %s from %s%s",
216 EmptyString(client_p
->name
) ? name
: "",
217 get_server_name(client_p
, HIDE_IP
));
218 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s",
220 EmptyString(client_p
->name
) ? name
: "",
221 log_client_name(client_p
, SHOW_IP
));
223 sendto_one(client_p
, "ERROR :SID already exists.");
224 exit_client(client_p
, client_p
, client_p
, "SID Exists");
229 * if we are connecting (Handshake), we already have the name from the
230 * C:line in client_p->name
233 strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
234 set_server_gecos(client_p
, info
);
235 client_p
->hopcount
= hop
;
236 server_estab(client_p
);
242 * ms_server - SERVER message handler
243 * parv[0] = sender prefix
244 * parv[1] = servername
245 * parv[2] = serverinfo/hopcount
246 * parv[3] = serverinfo
249 ms_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
251 char info
[REALLEN
+ 1];
252 /* same size as in s_misc.c */
254 struct Client
*target_p
;
255 struct remote_conf
*hub_p
;
256 hook_data_client hdata
;
264 strlcpy(info
, parv
[3], sizeof(info
));
266 if((target_p
= find_server(NULL
, name
)))
269 * This link is trying feed me a server that I already have
270 * access through another path -- multiple paths not accepted
271 * currently, kill this link immediately!!
273 * Rather than KILL the link which introduced it, KILL the
274 * youngest of the two links. -avalon
276 * I think that we should exit the link itself, not the introducer,
277 * and we should always exit the most recently received(i.e. the
278 * one we are receiving this SERVER for. -A1kmm
280 * You *cant* do this, if you link somewhere, it bursts you a server
281 * that already exists, then sends you a client burst, you squit the
282 * server, but you keep getting the burst of clients on a server that
283 * doesnt exist, although ircd can handle it, its not a realistic
286 /* It is behind a host-masked server. Completely ignore the
287 * server message(don't propagate or we will delink from whoever
288 * we propagate to). -A1kmm */
289 if(irccmp(target_p
->name
, name
) && target_p
->from
== client_p
)
292 sendto_one(client_p
, "ERROR :Server %s already exists", name
);
294 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
295 "Link %s cancelled, server %s already exists",
296 get_server_name(client_p
, SHOW_IP
), name
);
297 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
298 client_p
->name
, name
);
300 exit_client(client_p
, client_p
, &me
, "Server Exists");
305 * User nicks never have '.' in them and server names
306 * must always have '.' in them.
308 if(strchr(name
, '.') == NULL
)
311 * Server trying to use the same name as a person. Would
312 * cause a fair bit of confusion. Enough to make it hellish
313 * for a while and servers to send stuff to the wrong place.
315 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
316 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
317 "Link %s cancelled: Server/nick collision on %s",
318 get_server_name(client_p
, HIDE_IP
), name
);
319 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
320 client_p
->name
, name
);
322 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
327 * Server is informing about a new server behind
328 * this link. Create REMOTE server structure,
329 * add it to list and propagate word to my other
332 if(parc
== 1 || EmptyString(info
))
334 sendto_one(client_p
, "ERROR :No server info specified for %s", name
);
339 * See if the newly found server is behind a guaranteed
340 * leaf. If so, close the link.
343 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
347 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
349 if(hub_p
->flags
& CONF_HUB
)
356 /* Ok, this way this works is
358 * A server can have a CONF_HUB allowing it to introduce servers
362 * name = "irc.bighub.net";
366 * That would allow "irc.bighub.net" to introduce anything it wanted..
371 * name = "irc.somehub.fi";
375 * Would allow this server in finland to hub anything but
379 /* Ok, check client_p can hub the new server, and make sure it's not a LL */
382 /* OOOPs nope can't HUB */
383 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
384 get_server_name(client_p
, HIDE_IP
), name
);
385 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
386 client_p
->name
, name
);
388 exit_client(NULL
, client_p
, &me
, "No matching hub_mask.");
392 /* Check for the new server being leafed behind this HUB */
395 /* OOOPs nope can't HUB this leaf */
396 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
397 "Link %s introduced leafed server %s.",
398 get_server_name(client_p
, HIDE_IP
), name
);
399 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
400 client_p
->name
, name
);
402 exit_client(NULL
, client_p
, &me
, "Leafed Server.");
408 if(strlen(name
) > HOSTLEN
)
410 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
411 "Link %s introduced server with invalid servername %s",
412 get_server_name(client_p
, HIDE_IP
), name
);
413 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
414 client_p
->name
, name
);
416 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
420 target_p
= make_client(client_p
);
421 make_server(target_p
);
422 target_p
->hopcount
= hop
;
424 strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
426 set_server_gecos(target_p
, info
);
428 target_p
->servptr
= source_p
;
432 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
433 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
434 add_to_client_hash(target_p
->name
, target_p
);
435 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
437 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
439 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
440 ":%s SERVER %s %d :%s%s",
441 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
442 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
444 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
445 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
447 /* quick, dirty EOB. you know you love it. */
448 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
450 hdata
.client
= source_p
;
451 hdata
.target
= target_p
;
452 call_hook(h_server_introduced
, &hdata
);
458 ms_sid(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
460 struct Client
*target_p
;
461 struct remote_conf
*hub_p
;
462 hook_data_client hdata
;
470 /* collision on the name? */
471 if((target_p
= find_server(NULL
, parv
[1])) != NULL
)
473 sendto_one(client_p
, "ERROR :Server %s already exists", parv
[1]);
474 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
475 "Link %s cancelled, server %s already exists",
476 get_server_name(client_p
, SHOW_IP
), parv
[1]);
477 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
478 client_p
->name
, parv
[1]);
480 exit_client(NULL
, client_p
, &me
, "Server Exists");
484 /* collision on the SID? */
485 if((target_p
= find_id(parv
[3])) != NULL
)
487 sendto_one(client_p
, "ERROR :SID %s already exists", parv
[3]);
488 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
489 "Link %s cancelled, SID %s already exists",
490 get_server_name(client_p
, SHOW_IP
), parv
[3]);
491 ilog(L_SERVER
, "Link %s cancelled, SID %s already exists",
492 client_p
->name
, parv
[3]);
494 exit_client(NULL
, client_p
, &me
, "SID Exists");
498 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
500 sendto_one(client_p
, "ERROR :Invalid servername");
501 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
502 "Link %s cancelled, servername %s invalid",
503 get_server_name(client_p
, SHOW_IP
), parv
[1]);
504 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
505 client_p
->name
, parv
[1]);
507 exit_client(NULL
, client_p
, &me
, "Bogus server name");
511 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
512 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
514 sendto_one(client_p
, "ERROR :Invalid SID");
515 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
516 "Link %s cancelled, SID %s invalid",
517 get_server_name(client_p
, SHOW_IP
), parv
[3]);
518 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
519 client_p
->name
, parv
[3]);
521 exit_client(NULL
, client_p
, &me
, "Bogus SID");
525 /* for the directly connected server:
526 * H: allows it to introduce a server matching that mask
527 * L: disallows it introducing a server matching that mask
529 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
533 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
535 if(hub_p
->flags
& CONF_HUB
)
542 /* no matching hub_mask */
545 sendto_one(client_p
, "ERROR :No matching hub_mask");
546 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
547 "Non-Hub link %s introduced %s.",
548 get_server_name(client_p
, SHOW_IP
), parv
[1]);
549 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
550 client_p
->name
, parv
[1]);
551 exit_client(NULL
, client_p
, &me
, "No matching hub_mask.");
555 /* matching leaf_mask */
558 sendto_one(client_p
, "ERROR :Matching leaf_mask");
559 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
560 "Link %s introduced leafed server %s.",
561 get_server_name(client_p
, SHOW_IP
), parv
[1]);
562 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
563 client_p
->name
, parv
[1]);
564 exit_client(NULL
, client_p
, &me
, "Leafed Server.");
569 target_p
= make_client(client_p
);
570 make_server(target_p
);
572 strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
573 target_p
->hopcount
= atoi(parv
[2]);
574 strcpy(target_p
->id
, parv
[3]);
575 set_server_gecos(target_p
, parv
[4]);
577 target_p
->servptr
= source_p
;
580 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
581 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
582 add_to_client_hash(target_p
->name
, target_p
);
583 add_to_id_hash(target_p
->id
, target_p
);
584 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
586 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
588 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
589 ":%s SID %s %d %s :%s%s",
590 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
591 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
592 sendto_server(client_p
, NULL
, NOCAPS
, CAP_TS6
,
593 ":%s SERVER %s %d :%s%s",
594 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
595 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
597 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
598 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
600 /* quick, dirty EOB. you know you love it. */
601 sendto_one(target_p
, ":%s PING %s %s",
602 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
604 hdata
.client
= source_p
;
605 hdata
.target
= target_p
;
606 call_hook(h_server_introduced
, &hdata
);
611 /* set_server_gecos()
613 * input - pointer to client
615 * side effects - servers gecos field is set
618 set_server_gecos(struct Client
*client_p
, const char *info
)
620 /* check the info for [IP] */
627 s
= LOCAL_COPY(info
);
629 /* we should only check the first word for an ip */
630 if((p
= strchr(s
, ' ')))
633 /* check for a ] which would symbolise an [IP] */
634 if((t
= strchr(s
, ']')))
636 /* set s to after the first space */
642 /* no ], put the space back */
646 /* p may have been set to a trailing space, so check s exists and that
648 if(s
&& (*s
!= '\0'))
650 /* a space? if not (H) could be the last part of info.. */
651 if((p
= strchr(s
, ' ')))
654 /* check for (H) which is a hidden server */
655 if(!strcmp(s
, "(H)"))
659 /* if there was no space.. theres nothing to set info to */
668 /* if there was a trailing space, s could point to \0, so check */
669 if(s
&& (*s
!= '\0'))
671 strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
677 strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
686 * output - 1 if a bogus hostname input, 0 if its valid
687 * side effects - none
690 bogus_host(const char *host
)
692 int bogus_server
= 0;
696 for(s
= host
; *s
; s
++)
707 if(!dots
|| bogus_server
)