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 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 rb_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 client_p
->name
, 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",
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 "[@255.255.255.255]", 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 "[@255.255.255.255]", 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 "[@255.255.255.255]", 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
, "[@255.255.255.255]");
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 /* require TS6 for direct links */
188 if(!IsCapable(client_p
, CAP_TS6
))
190 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
191 "Link %s dropped, TS6 protocol is required", name
);
192 exit_client(client_p
, client_p
, client_p
, "Incompatible TS version");
196 if((target_p
= find_server(NULL
, name
)))
199 * This link is trying feed me a server that I already have
200 * access through another path -- multiple paths not accepted
201 * currently, kill this link immediately!!
203 * Rather than KILL the link which introduced it, KILL the
204 * youngest of the two links. -avalon
206 * Definitely don't do that here. This is from an unregistered
209 if (target_p
->servptr
->flags
& FLAGS_SERVICE
)
211 /* Assume any servers introduced by services
215 sendto_one(client_p
, "ERROR :Server juped.");
219 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
220 "Attempt to re-introduce server %s from %s",
221 name
, "[@255.255.255.255]");
222 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
223 name
, log_client_name(client_p
, SHOW_IP
));
225 sendto_one(client_p
, "ERROR :Server already exists.");
227 exit_client(client_p
, client_p
, client_p
, "Server Exists");
231 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
233 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
234 "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
236 EmptyString(client_p
->name
) ? name
: "",
237 client_p
->name
, target_p
->name
);
238 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
240 EmptyString(client_p
->name
) ? name
: "",
241 log_client_name(client_p
, SHOW_IP
),
244 sendto_one(client_p
, "ERROR :SID already exists.");
245 exit_client(client_p
, client_p
, client_p
, "SID Exists");
250 * if we are connecting (Handshake), we already have the name from the
251 * C:line in client_p->name
254 rb_strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
255 set_server_gecos(client_p
, info
);
256 client_p
->hopcount
= hop
;
257 server_estab(client_p
);
263 * ms_server - SERVER message handler
264 * parv[0] = sender prefix
265 * parv[1] = servername
266 * parv[2] = serverinfo/hopcount
267 * parv[3] = serverinfo
270 ms_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
272 char info
[REALLEN
+ 1];
273 /* same size as in s_misc.c */
275 struct Client
*target_p
;
276 struct remote_conf
*hub_p
;
277 hook_data_client hdata
;
282 char squitreason
[160];
286 rb_strlcpy(info
, parv
[3], sizeof(info
));
288 if((target_p
= find_server(NULL
, name
)))
291 * This link is trying feed me a server that I already have
292 * access through another path -- multiple paths not accepted
293 * currently, kill this link immediately!!
295 * Rather than KILL the link which introduced it, KILL the
296 * youngest of the two links. -avalon
298 * I think that we should exit the link itself, not the introducer,
299 * and we should always exit the most recently received(i.e. the
300 * one we are receiving this SERVER for. -A1kmm
302 * You *cant* do this, if you link somewhere, it bursts you a server
303 * that already exists, then sends you a client burst, you squit the
304 * server, but you keep getting the burst of clients on a server that
305 * doesnt exist, although ircd can handle it, its not a realistic
308 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
309 client_p
->name
, name
);
311 rb_snprintf(squitreason
, sizeof squitreason
,
312 "Server %s already exists",
314 exit_client(client_p
, client_p
, &me
, squitreason
);
319 * User nicks never have '.' in them and server names
320 * must always have '.' in them.
322 if(strchr(name
, '.') == NULL
)
325 * Server trying to use the same name as a person. Would
326 * cause a fair bit of confusion. Enough to make it hellish
327 * for a while and servers to send stuff to the wrong place.
329 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
330 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
331 "Link %s cancelled: Server/nick collision on %s",
332 client_p
->name
, name
);
333 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
334 client_p
->name
, name
);
336 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
341 * Server is informing about a new server behind
342 * this link. Create REMOTE server structure,
343 * add it to list and propagate word to my other
348 * See if the newly found server is behind a guaranteed
349 * leaf. If so, close the link.
352 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
356 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
358 if(hub_p
->flags
& CONF_HUB
)
365 /* Ok, this way this works is
367 * A server can have a CONF_HUB allowing it to introduce servers
371 * name = "irc.bighub.net";
375 * That would allow "irc.bighub.net" to introduce anything it wanted..
380 * name = "irc.somehub.fi";
384 * Would allow this server in finland to hub anything but
388 /* Ok, check client_p can hub the new server */
391 /* OOOPs nope can't HUB */
392 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
393 client_p
->name
, name
);
394 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
395 client_p
->name
, name
);
397 rb_snprintf(squitreason
, sizeof squitreason
,
398 "No matching hub_mask for %s",
400 exit_client(NULL
, client_p
, &me
, squitreason
);
404 /* Check for the new server being leafed behind this HUB */
407 /* OOOPs nope can't HUB this leaf */
408 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
409 "Link %s introduced leafed server %s.",
410 client_p
->name
, name
);
411 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
412 client_p
->name
, name
);
414 rb_snprintf(squitreason
, sizeof squitreason
,
415 "Matching leaf_mask for %s",
417 exit_client(NULL
, client_p
, &me
, squitreason
);
423 if(strlen(name
) > HOSTLEN
)
425 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
426 "Link %s introduced server with invalid servername %s",
427 client_p
->name
, name
);
428 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
429 client_p
->name
, name
);
431 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
435 target_p
= make_client(client_p
);
436 make_server(target_p
);
437 target_p
->hopcount
= hop
;
439 rb_strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
441 set_server_gecos(target_p
, info
);
443 target_p
->servptr
= source_p
;
447 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
448 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
449 add_to_client_hash(target_p
->name
, target_p
);
450 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
452 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
454 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
455 ":%s SERVER %s %d :%s%s",
456 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
457 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
459 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
460 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
462 /* quick, dirty EOB. you know you love it. */
463 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
465 hdata
.client
= source_p
;
466 hdata
.target
= target_p
;
467 call_hook(h_server_introduced
, &hdata
);
473 ms_sid(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
475 struct Client
*target_p
;
476 struct remote_conf
*hub_p
;
477 hook_data_client hdata
;
482 char squitreason
[160];
486 /* collision on the name? */
487 if((target_p
= find_server(NULL
, parv
[1])) != NULL
)
489 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
490 client_p
->name
, parv
[1]);
492 rb_snprintf(squitreason
, sizeof squitreason
,
493 "Server %s already exists",
495 exit_client(NULL
, client_p
, &me
, squitreason
);
499 /* collision on the SID? */
500 if((target_p
= find_id(parv
[3])) != NULL
)
502 sendto_wallops_flags(UMODE_WALLOP
, &me
,
503 "Link %s cancelled, SID %s for server %s already in use by %s",
504 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
505 sendto_server(NULL
, NULL
, CAP_TS6
, NOCAPS
,
506 ":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
507 me
.id
, client_p
->name
, parv
[3], parv
[1], target_p
->name
);
508 ilog(L_SERVER
, "Link %s cancelled, SID %s for server %s already in use by %s",
509 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
511 rb_snprintf(squitreason
, sizeof squitreason
,
512 "SID %s for %s already in use by %s",
513 parv
[3], parv
[1], target_p
->name
);
514 exit_client(NULL
, client_p
, &me
, squitreason
);
518 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
520 sendto_one(client_p
, "ERROR :Invalid servername");
521 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
522 "Link %s cancelled, servername %s invalid",
523 client_p
->name
, parv
[1]);
524 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
525 client_p
->name
, parv
[1]);
527 exit_client(NULL
, client_p
, &me
, "Bogus server name");
531 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
532 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
534 sendto_one(client_p
, "ERROR :Invalid SID");
535 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
536 "Link %s cancelled, SID %s invalid",
537 client_p
->name
, parv
[3]);
538 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
539 client_p
->name
, parv
[3]);
541 exit_client(NULL
, client_p
, &me
, "Bogus SID");
545 /* for the directly connected server:
546 * H: allows it to introduce a server matching that mask
547 * L: disallows it introducing a server matching that mask
549 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
553 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
555 if(hub_p
->flags
& CONF_HUB
)
562 /* no matching hub_mask */
565 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
566 "Non-Hub link %s introduced %s.",
567 client_p
->name
, parv
[1]);
568 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
569 client_p
->name
, parv
[1]);
571 rb_snprintf(squitreason
, sizeof squitreason
,
572 "No matching hub_mask for %s",
574 exit_client(NULL
, client_p
, &me
, squitreason
);
578 /* matching leaf_mask */
581 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
582 "Link %s introduced leafed server %s.",
583 client_p
->name
, parv
[1]);
584 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
585 client_p
->name
, parv
[1]);
587 rb_snprintf(squitreason
, sizeof squitreason
,
588 "Matching leaf_mask for %s",
590 exit_client(NULL
, client_p
, &me
, squitreason
);
595 target_p
= make_client(client_p
);
596 make_server(target_p
);
598 rb_strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
599 target_p
->hopcount
= atoi(parv
[2]);
600 strcpy(target_p
->id
, parv
[3]);
601 set_server_gecos(target_p
, parv
[4]);
603 target_p
->servptr
= source_p
;
606 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
607 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
608 add_to_client_hash(target_p
->name
, target_p
);
609 add_to_id_hash(target_p
->id
, target_p
);
610 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
612 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
614 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
615 ":%s SID %s %d %s :%s%s",
616 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
617 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
619 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
620 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
622 /* quick, dirty EOB. you know you love it. */
623 sendto_one(target_p
, ":%s PING %s %s",
624 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
626 hdata
.client
= source_p
;
627 hdata
.target
= target_p
;
628 call_hook(h_server_introduced
, &hdata
);
633 /* set_server_gecos()
635 * input - pointer to client
637 * side effects - servers gecos field is set
640 set_server_gecos(struct Client
*client_p
, const char *info
)
642 /* check the info for [IP] */
649 s
= LOCAL_COPY(info
);
651 /* we should only check the first word for an ip */
652 if((p
= strchr(s
, ' ')))
655 /* check for a ] which would symbolise an [IP] */
656 if((t
= strchr(s
, ']')))
658 /* set s to after the first space */
664 /* no ], put the space back */
668 /* p may have been set to a trailing space, so check s exists and that
670 if(s
&& (*s
!= '\0'))
672 /* a space? if not (H) could be the last part of info.. */
673 if((p
= strchr(s
, ' ')))
676 /* check for (H) which is a hidden server */
677 if(!strcmp(s
, "(H)"))
681 /* if there was no space.. theres nothing to set info to */
690 /* if there was a trailing space, s could point to \0, so check */
691 if(s
&& (*s
!= '\0'))
693 rb_strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
699 rb_strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
708 * output - 1 if a bogus hostname input, 0 if its valid
709 * side effects - none
712 bogus_host(const char *host
)
714 int bogus_server
= 0;
718 for(s
= host
; *s
; s
++)
729 if(!dots
|| bogus_server
)