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 $
29 #include "client.h" /* client struct */
30 #include "common.h" /* TRUE bleah */
32 #include "hash.h" /* add_to_client_hash */
33 #include "irc_string.h"
34 #include "ircd.h" /* me */
35 #include "numeric.h" /* ERR_xxx */
36 #include "s_conf.h" /* struct ConfItem */
37 #include "s_newconf.h"
38 #include "s_log.h" /* log level defines */
39 #include "s_serv.h" /* server_estab, check_server */
40 #include "s_stats.h" /* ServerStats */
41 #include "send.h" /* sendto_one */
46 static int mr_server(struct Client
*, struct Client
*, int, const char **);
47 static int ms_server(struct Client
*, struct Client
*, int, const char **);
48 static int ms_sid(struct Client
*, struct Client
*, int, const char **);
50 struct Message server_msgtab
= {
51 "SERVER", 0, 0, 0, MFLG_SLOW
| MFLG_UNREG
,
52 {{mr_server
, 4}, mg_reg
, mg_ignore
, {ms_server
, 4}, mg_ignore
, mg_reg
}
54 struct Message sid_msgtab
= {
55 "SID", 0, 0, 0, MFLG_SLOW
,
56 {mg_ignore
, mg_reg
, mg_ignore
, {ms_sid
, 5}, mg_ignore
, mg_reg
}
59 mapi_clist_av1 server_clist
[] = { &server_msgtab
, &sid_msgtab
, NULL
};
61 DECLARE_MODULE_AV1(server
, NULL
, NULL
, server_clist
, NULL
, NULL
, "$Revision: 3291 $");
63 int bogus_host(const char *host
);
64 static int set_server_gecos(struct Client
*, const char *);
67 * mr_server - SERVER message handler
68 * parv[0] = sender prefix
69 * parv[1] = servername
70 * parv[2] = serverinfo/hopcount
71 * parv[3] = serverinfo
74 mr_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
76 char info
[REALLEN
+ 1];
78 struct Client
*target_p
;
83 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 get_server_name(client_p
, HIDE_IP
), 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",
102 get_server_name(client_p
, HIDE_IP
));
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 get_server_name(client_p
, HIDE_IP
), 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
, L_ALL
,
137 "Unauthorised server connection attempt from %s: "
138 "Bad password for server %s",
139 get_server_name(client_p
, HIDE_IP
), name
);
141 ilog(L_SERVER
, "Access denied, invalid password 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 password.");
151 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
152 "Unauthorised server connection attempt from %s: "
153 "Invalid host for server %s",
154 get_server_name(client_p
, HIDE_IP
), 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
, get_server_name(client_p
, HIDE_IP
));
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.");
179 if((target_p
= find_server(NULL
, name
)))
182 * This link is trying feed me a server that I already have
183 * access through another path -- multiple paths not accepted
184 * currently, kill this link immediately!!
186 * Rather than KILL the link which introduced it, KILL the
187 * youngest of the two links. -avalon
189 * Definitely don't do that here. This is from an unregistered
192 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
193 "Attempt to re-introduce server %s from %s",
194 name
, get_server_name(client_p
, HIDE_IP
));
195 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
196 name
, log_client_name(client_p
, SHOW_IP
));
198 sendto_one(client_p
, "ERROR :Server already exists.");
199 exit_client(client_p
, client_p
, client_p
, "Server Exists");
203 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
205 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
206 "Attempt to re-introduce SID %s from %s%s",
208 EmptyString(client_p
->name
) ? name
: "",
209 get_server_name(client_p
, HIDE_IP
));
210 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s",
212 EmptyString(client_p
->name
) ? name
: "",
213 log_client_name(client_p
, SHOW_IP
));
215 sendto_one(client_p
, "ERROR :SID already exists.");
216 exit_client(client_p
, client_p
, client_p
, "SID Exists");
221 * if we are connecting (Handshake), we already have the name from the
222 * C:line in client_p->name
225 strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
226 set_server_gecos(client_p
, info
);
227 client_p
->hopcount
= hop
;
228 server_estab(client_p
);
234 * ms_server - SERVER message handler
235 * parv[0] = sender prefix
236 * parv[1] = servername
237 * parv[2] = serverinfo/hopcount
238 * parv[3] = serverinfo
241 ms_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
243 char info
[REALLEN
+ 1];
244 /* same size as in s_misc.c */
246 struct Client
*target_p
;
247 struct remote_conf
*hub_p
;
248 hook_data_client hdata
;
256 strlcpy(info
, parv
[3], sizeof(info
));
258 if((target_p
= find_server(NULL
, name
)))
261 * This link is trying feed me a server that I already have
262 * access through another path -- multiple paths not accepted
263 * currently, kill this link immediately!!
265 * Rather than KILL the link which introduced it, KILL the
266 * youngest of the two links. -avalon
268 * I think that we should exit the link itself, not the introducer,
269 * and we should always exit the most recently received(i.e. the
270 * one we are receiving this SERVER for. -A1kmm
272 * You *cant* do this, if you link somewhere, it bursts you a server
273 * that already exists, then sends you a client burst, you squit the
274 * server, but you keep getting the burst of clients on a server that
275 * doesnt exist, although ircd can handle it, its not a realistic
278 /* It is behind a host-masked server. Completely ignore the
279 * server message(don't propagate or we will delink from whoever
280 * we propagate to). -A1kmm */
281 if(irccmp(target_p
->name
, name
) && target_p
->from
== client_p
)
284 sendto_one(client_p
, "ERROR :Server %s already exists", name
);
286 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
287 "Link %s cancelled, server %s already exists",
288 get_server_name(client_p
, SHOW_IP
), name
);
289 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
290 client_p
->name
, name
);
292 exit_client(client_p
, client_p
, &me
, "Server Exists");
297 * User nicks never have '.' in them and server names
298 * must always have '.' in them.
300 if(strchr(name
, '.') == NULL
)
303 * Server trying to use the same name as a person. Would
304 * cause a fair bit of confusion. Enough to make it hellish
305 * for a while and servers to send stuff to the wrong place.
307 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
308 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
309 "Link %s cancelled: Server/nick collision on %s",
310 get_server_name(client_p
, HIDE_IP
), name
);
311 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
312 client_p
->name
, name
);
314 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
319 * Server is informing about a new server behind
320 * this link. Create REMOTE server structure,
321 * add it to list and propagate word to my other
324 if(parc
== 1 || EmptyString(info
))
326 sendto_one(client_p
, "ERROR :No server info specified for %s", name
);
331 * See if the newly found server is behind a guaranteed
332 * leaf. If so, close the link.
335 DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
339 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
341 if(hub_p
->flags
& CONF_HUB
)
348 /* Ok, this way this works is
350 * A server can have a CONF_HUB allowing it to introduce servers
354 * name = "irc.bighub.net";
358 * That would allow "irc.bighub.net" to introduce anything it wanted..
363 * name = "irc.somehub.fi";
367 * Would allow this server in finland to hub anything but
371 /* Ok, check client_p can hub the new server, and make sure it's not a LL */
374 /* OOOPs nope can't HUB */
375 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
376 get_server_name(client_p
, HIDE_IP
), name
);
377 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
378 client_p
->name
, name
);
380 exit_client(NULL
, client_p
, &me
, "No matching hub_mask.");
384 /* Check for the new server being leafed behind this HUB */
387 /* OOOPs nope can't HUB this leaf */
388 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
389 "Link %s introduced leafed server %s.",
390 get_server_name(client_p
, HIDE_IP
), name
);
391 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
392 client_p
->name
, name
);
394 exit_client(NULL
, client_p
, &me
, "Leafed Server.");
400 if(strlen(name
) > HOSTLEN
)
402 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
403 "Link %s introduced server with invalid servername %s",
404 get_server_name(client_p
, HIDE_IP
), name
);
405 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
406 client_p
->name
, name
);
408 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
412 target_p
= make_client(client_p
);
413 make_server(target_p
);
414 target_p
->hopcount
= hop
;
416 strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
418 set_server_gecos(target_p
, info
);
420 target_p
->servptr
= source_p
;
424 dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
425 dlinkAddTailAlloc(target_p
, &global_serv_list
);
426 add_to_client_hash(target_p
->name
, target_p
);
427 dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
429 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
430 ":%s SERVER %s %d :%s%s",
431 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
432 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
434 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
435 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
437 /* quick, dirty EOB. you know you love it. */
438 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
440 hdata
.client
= source_p
;
441 hdata
.target
= target_p
;
442 call_hook(h_server_introduced
, &hdata
);
448 ms_sid(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
450 struct Client
*target_p
;
451 struct remote_conf
*hub_p
;
452 hook_data_client hdata
;
460 /* collision on the name? */
461 if((target_p
= find_server(NULL
, parv
[1])) != NULL
)
463 sendto_one(client_p
, "ERROR :Server %s already exists", parv
[1]);
464 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
465 "Link %s cancelled, server %s already exists",
466 get_server_name(client_p
, SHOW_IP
), parv
[1]);
467 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
468 client_p
->name
, parv
[1]);
470 exit_client(NULL
, client_p
, &me
, "Server Exists");
474 /* collision on the SID? */
475 if((target_p
= find_id(parv
[3])) != NULL
)
477 sendto_one(client_p
, "ERROR :SID %s already exists", parv
[3]);
478 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
479 "Link %s cancelled, SID %s already exists",
480 get_server_name(client_p
, SHOW_IP
), parv
[3]);
481 ilog(L_SERVER
, "Link %s cancelled, SID %s already exists",
482 client_p
->name
, parv
[3]);
484 exit_client(NULL
, client_p
, &me
, "Server Exists");
488 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
490 sendto_one(client_p
, "ERROR :Invalid servername");
491 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
492 "Link %s cancelled, servername %s invalid",
493 get_server_name(client_p
, SHOW_IP
), parv
[1]);
494 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
495 client_p
->name
, parv
[1]);
497 exit_client(NULL
, client_p
, &me
, "Bogus server name");
501 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
502 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
504 sendto_one(client_p
, "ERROR :Invalid SID");
505 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
506 "Link %s cancelled, SID %s invalid",
507 get_server_name(client_p
, SHOW_IP
), parv
[3]);
508 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
509 client_p
->name
, parv
[3]);
511 exit_client(NULL
, client_p
, &me
, "Bogus SID");
515 /* for the directly connected server:
516 * H: allows it to introduce a server matching that mask
517 * L: disallows it introducing a server matching that mask
519 DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
523 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
525 if(hub_p
->flags
& CONF_HUB
)
532 /* no matching hub_mask */
535 sendto_one(client_p
, "ERROR :No matching hub_mask");
536 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
537 "Non-Hub link %s introduced %s.",
538 get_server_name(client_p
, SHOW_IP
), parv
[1]);
539 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
540 client_p
->name
, parv
[1]);
541 exit_client(NULL
, client_p
, &me
, "No matching hub_mask.");
545 /* matching leaf_mask */
548 sendto_one(client_p
, "ERROR :Matching leaf_mask");
549 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
550 "Link %s introduced leafed server %s.",
551 get_server_name(client_p
, SHOW_IP
), parv
[1]);
552 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
553 client_p
->name
, parv
[1]);
554 exit_client(NULL
, client_p
, &me
, "Leafed Server.");
559 target_p
= make_client(client_p
);
560 make_server(target_p
);
562 strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
563 target_p
->hopcount
= atoi(parv
[2]);
564 strcpy(target_p
->id
, parv
[3]);
565 set_server_gecos(target_p
, parv
[4]);
567 target_p
->servptr
= source_p
;
570 dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
571 dlinkAddTailAlloc(target_p
, &global_serv_list
);
572 add_to_client_hash(target_p
->name
, target_p
);
573 add_to_id_hash(target_p
->id
, target_p
);
574 dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
576 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
577 ":%s SID %s %d %s :%s%s",
578 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
579 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
580 sendto_server(client_p
, NULL
, NOCAPS
, CAP_TS6
,
581 ":%s SERVER %s %d :%s%s",
582 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
583 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
585 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
586 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
588 /* quick, dirty EOB. you know you love it. */
589 sendto_one(target_p
, ":%s PING %s %s",
590 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
592 hdata
.client
= source_p
;
593 hdata
.target
= target_p
;
594 call_hook(h_server_introduced
, &hdata
);
599 /* set_server_gecos()
601 * input - pointer to client
603 * side effects - servers gecos field is set
606 set_server_gecos(struct Client
*client_p
, const char *info
)
608 /* check the info for [IP] */
615 s
= LOCAL_COPY(info
);
617 /* we should only check the first word for an ip */
618 if((p
= strchr(s
, ' ')))
621 /* check for a ] which would symbolise an [IP] */
622 if((t
= strchr(s
, ']')))
624 /* set s to after the first space */
630 /* no ], put the space back */
634 /* p may have been set to a trailing space, so check s exists and that
636 if(s
&& (*s
!= '\0'))
638 /* a space? if not (H) could be the last part of info.. */
639 if((p
= strchr(s
, ' ')))
642 /* check for (H) which is a hidden server */
643 if(!strcmp(s
, "(H)"))
647 /* if there was no space.. theres nothing to set info to */
656 /* if there was a trailing space, s could point to \0, so check */
657 if(s
&& (*s
!= '\0'))
659 strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
665 strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
674 * output - 1 if a bogus hostname input, 0 if its valid
675 * side effects - none
678 bogus_host(const char *host
)
680 int bogus_server
= 0;
684 for(s
= host
; *s
; s
++)
695 if(!dots
|| bogus_server
)