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[1] = servername
68 * parv[2] = serverinfo/hopcount
69 * parv[3] = serverinfo
72 mr_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
74 char info
[REALLEN
+ 1];
76 struct Client
*target_p
;
78 struct Capability
*cap
;
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 /* check to ensure any "required" caps are set. --nenolod */
113 for (cap
= captab
; cap
->name
; cap
++)
118 if (!(client_p
->localClient
->caps
& cap
->cap
))
120 char exitbuf
[BUFSIZE
];
122 rb_snprintf(exitbuf
, BUFSIZE
, "Missing required CAPAB [%s]", cap
->name
);
123 exit_client(client_p
, client_p
, client_p
, exitbuf
);
129 /* Now we just have to call check_server and everything should be
130 * check for us... -A1kmm. */
131 switch (check_server(name
, client_p
))
134 if(ConfigFileEntry
.warn_no_nline
)
136 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
137 "Unauthorised server connection attempt from %s: "
138 "No entry for servername %s",
139 "[@255.255.255.255]", name
);
141 ilog(L_SERVER
, "Access denied, no connect block for server %s%s",
142 EmptyString(client_p
->name
) ? name
: "",
143 log_client_name(client_p
, SHOW_IP
));
146 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
152 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
153 "Unauthorised server connection attempt from %s: "
154 "Bad password for server %s",
155 "[@255.255.255.255]", name
);
157 ilog(L_SERVER
, "Access denied, invalid password for server %s%s",
158 EmptyString(client_p
->name
) ? name
: "",
159 log_client_name(client_p
, SHOW_IP
));
161 exit_client(client_p
, client_p
, client_p
, "Invalid password.");
167 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
168 "Unauthorised server connection attempt from %s: "
169 "Invalid host for server %s",
170 "[@255.255.255.255]", name
);
172 ilog(L_SERVER
, "Access denied, invalid host for server %s%s",
173 EmptyString(client_p
->name
) ? name
: "",
174 log_client_name(client_p
, SHOW_IP
));
176 exit_client(client_p
, client_p
, client_p
, "Invalid host.");
181 /* servername is > HOSTLEN */
183 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
184 "Invalid servername %s from %s",
185 name
, "[@255.255.255.255]");
186 ilog(L_SERVER
, "Access denied, invalid servername from %s",
187 log_client_name(client_p
, SHOW_IP
));
189 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
194 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
195 "Connection from servername %s requires SSL/TLS but is plaintext",
197 ilog(L_SERVER
, "Access denied, requires SSL/TLS but is plaintext from %s",
198 log_client_name(client_p
, SHOW_IP
));
200 exit_client(client_p
, client_p
, client_p
, "Access denied, requires SSL/TLS but is plaintext");
204 /* require TS6 for direct links */
205 if(!IsCapable(client_p
, CAP_TS6
))
207 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
208 "Link %s dropped, TS6 protocol is required", name
);
209 exit_client(client_p
, client_p
, client_p
, "Incompatible TS version");
213 if((target_p
= find_server(NULL
, name
)))
216 * This link is trying feed me a server that I already have
217 * access through another path -- multiple paths not accepted
218 * currently, kill this link immediately!!
220 * Rather than KILL the link which introduced it, KILL the
221 * youngest of the two links. -avalon
223 * Definitely don't do that here. This is from an unregistered
226 if (target_p
->servptr
->flags
& FLAGS_SERVICE
)
228 /* Assume any servers introduced by services
232 sendto_one(client_p
, "ERROR :Server juped.");
236 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
237 "Attempt to re-introduce server %s from %s",
238 name
, "[@255.255.255.255]");
239 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
240 name
, log_client_name(client_p
, SHOW_IP
));
242 sendto_one(client_p
, "ERROR :Server already exists.");
244 exit_client(client_p
, client_p
, client_p
, "Server Exists");
248 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
250 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
251 "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
253 EmptyString(client_p
->name
) ? name
: "",
254 client_p
->name
, target_p
->name
);
255 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
257 EmptyString(client_p
->name
) ? name
: "",
258 log_client_name(client_p
, SHOW_IP
),
261 sendto_one(client_p
, "ERROR :SID already exists.");
262 exit_client(client_p
, client_p
, client_p
, "SID Exists");
267 * if we are connecting (Handshake), we already have the name from the
268 * C:line in client_p->name
271 rb_strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
272 set_server_gecos(client_p
, info
);
273 client_p
->hopcount
= hop
;
274 server_estab(client_p
);
280 * ms_server - SERVER message handler
281 * parv[1] = servername
282 * parv[2] = serverinfo/hopcount
283 * parv[3] = serverinfo
286 ms_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
288 char info
[REALLEN
+ 1];
289 /* same size as in s_misc.c */
291 struct Client
*target_p
;
292 struct remote_conf
*hub_p
;
293 hook_data_client hdata
;
298 char squitreason
[160];
302 rb_strlcpy(info
, parv
[3], sizeof(info
));
304 if((target_p
= find_server(NULL
, name
)))
307 * This link is trying feed me a server that I already have
308 * access through another path -- multiple paths not accepted
309 * currently, kill this link immediately!!
311 * Rather than KILL the link which introduced it, KILL the
312 * youngest of the two links. -avalon
314 * I think that we should exit the link itself, not the introducer,
315 * and we should always exit the most recently received(i.e. the
316 * one we are receiving this SERVER for. -A1kmm
318 * You *cant* do this, if you link somewhere, it bursts you a server
319 * that already exists, then sends you a client burst, you squit the
320 * server, but you keep getting the burst of clients on a server that
321 * doesnt exist, although ircd can handle it, its not a realistic
324 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
325 client_p
->name
, name
);
327 rb_snprintf(squitreason
, sizeof squitreason
,
328 "Server %s already exists",
330 exit_client(client_p
, client_p
, &me
, squitreason
);
335 * User nicks never have '.' in them and server names
336 * must always have '.' in them.
338 if(strchr(name
, '.') == NULL
)
341 * Server trying to use the same name as a person. Would
342 * cause a fair bit of confusion. Enough to make it hellish
343 * for a while and servers to send stuff to the wrong place.
345 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
346 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
347 "Link %s cancelled: Server/nick collision on %s",
348 client_p
->name
, name
);
349 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
350 client_p
->name
, name
);
352 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
357 * Server is informing about a new server behind
358 * this link. Create REMOTE server structure,
359 * add it to list and propagate word to my other
364 * See if the newly found server is behind a guaranteed
365 * leaf. If so, close the link.
368 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
372 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
374 if(hub_p
->flags
& CONF_HUB
)
381 /* Ok, this way this works is
383 * A server can have a CONF_HUB allowing it to introduce servers
387 * name = "irc.bighub.net";
391 * That would allow "irc.bighub.net" to introduce anything it wanted..
396 * name = "irc.somehub.fi";
400 * Would allow this server in finland to hub anything but
404 /* Ok, check client_p can hub the new server */
407 /* OOOPs nope can't HUB */
408 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
409 client_p
->name
, name
);
410 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
411 client_p
->name
, name
);
413 rb_snprintf(squitreason
, sizeof squitreason
,
414 "No matching hub_mask for %s",
416 exit_client(NULL
, client_p
, &me
, squitreason
);
420 /* Check for the new server being leafed behind this HUB */
423 /* OOOPs nope can't HUB this leaf */
424 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
425 "Link %s introduced leafed server %s.",
426 client_p
->name
, name
);
427 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
428 client_p
->name
, name
);
430 rb_snprintf(squitreason
, sizeof squitreason
,
431 "Matching leaf_mask for %s",
433 exit_client(NULL
, client_p
, &me
, squitreason
);
439 if(strlen(name
) > HOSTLEN
)
441 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
442 "Link %s introduced server with invalid servername %s",
443 client_p
->name
, name
);
444 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
445 client_p
->name
, name
);
447 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
451 target_p
= make_client(client_p
);
452 make_server(target_p
);
453 target_p
->hopcount
= hop
;
455 rb_strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
457 set_server_gecos(target_p
, info
);
459 target_p
->servptr
= source_p
;
463 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
464 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
465 add_to_client_hash(target_p
->name
, target_p
);
466 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
468 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
470 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
471 ":%s SERVER %s %d :%s%s",
472 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
473 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
475 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
476 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
478 /* quick, dirty EOB. you know you love it. */
479 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
481 hdata
.client
= source_p
;
482 hdata
.target
= target_p
;
483 call_hook(h_server_introduced
, &hdata
);
489 ms_sid(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
491 struct Client
*target_p
;
492 struct remote_conf
*hub_p
;
493 hook_data_client hdata
;
498 char squitreason
[160];
502 /* collision on the name? */
503 if((target_p
= find_server(NULL
, parv
[1])) != NULL
)
505 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
506 client_p
->name
, parv
[1]);
508 rb_snprintf(squitreason
, sizeof squitreason
,
509 "Server %s already exists",
511 exit_client(NULL
, client_p
, &me
, squitreason
);
515 /* collision on the SID? */
516 if((target_p
= find_id(parv
[3])) != NULL
)
518 sendto_wallops_flags(UMODE_WALLOP
, &me
,
519 "Link %s cancelled, SID %s for server %s already in use by %s",
520 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
521 sendto_server(NULL
, NULL
, CAP_TS6
, NOCAPS
,
522 ":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
523 me
.id
, client_p
->name
, parv
[3], parv
[1], target_p
->name
);
524 ilog(L_SERVER
, "Link %s cancelled, SID %s for server %s already in use by %s",
525 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
527 rb_snprintf(squitreason
, sizeof squitreason
,
528 "SID %s for %s already in use by %s",
529 parv
[3], parv
[1], target_p
->name
);
530 exit_client(NULL
, client_p
, &me
, squitreason
);
534 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
536 sendto_one(client_p
, "ERROR :Invalid servername");
537 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
538 "Link %s cancelled, servername %s invalid",
539 client_p
->name
, parv
[1]);
540 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
541 client_p
->name
, parv
[1]);
543 exit_client(NULL
, client_p
, &me
, "Bogus server name");
547 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
548 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
550 sendto_one(client_p
, "ERROR :Invalid SID");
551 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
552 "Link %s cancelled, SID %s invalid",
553 client_p
->name
, parv
[3]);
554 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
555 client_p
->name
, parv
[3]);
557 exit_client(NULL
, client_p
, &me
, "Bogus SID");
561 /* for the directly connected server:
562 * H: allows it to introduce a server matching that mask
563 * L: disallows it introducing a server matching that mask
565 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
569 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
571 if(hub_p
->flags
& CONF_HUB
)
578 /* no matching hub_mask */
581 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
582 "Non-Hub link %s introduced %s.",
583 client_p
->name
, parv
[1]);
584 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
585 client_p
->name
, parv
[1]);
587 rb_snprintf(squitreason
, sizeof squitreason
,
588 "No matching hub_mask for %s",
590 exit_client(NULL
, client_p
, &me
, squitreason
);
594 /* matching leaf_mask */
597 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
598 "Link %s introduced leafed server %s.",
599 client_p
->name
, parv
[1]);
600 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
601 client_p
->name
, parv
[1]);
603 rb_snprintf(squitreason
, sizeof squitreason
,
604 "Matching leaf_mask for %s",
606 exit_client(NULL
, client_p
, &me
, squitreason
);
611 target_p
= make_client(client_p
);
612 make_server(target_p
);
614 rb_strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
615 target_p
->hopcount
= atoi(parv
[2]);
616 strcpy(target_p
->id
, parv
[3]);
617 set_server_gecos(target_p
, parv
[4]);
619 target_p
->servptr
= source_p
;
622 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
623 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
624 add_to_client_hash(target_p
->name
, target_p
);
625 add_to_id_hash(target_p
->id
, target_p
);
626 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
628 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
630 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
631 ":%s SID %s %d %s :%s%s",
632 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
633 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
635 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
636 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
638 /* quick, dirty EOB. you know you love it. */
639 sendto_one(target_p
, ":%s PING %s %s",
640 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
642 hdata
.client
= source_p
;
643 hdata
.target
= target_p
;
644 call_hook(h_server_introduced
, &hdata
);
649 /* set_server_gecos()
651 * input - pointer to client
653 * side effects - servers gecos field is set
656 set_server_gecos(struct Client
*client_p
, const char *info
)
658 /* check the info for [IP] */
664 s
= LOCAL_COPY(info
);
666 /* we should only check the first word for an ip */
667 if((p
= strchr(s
, ' ')))
670 /* check for a ] which would symbolise an [IP] */
673 /* set s to after the first space */
679 /* no ], put the space back */
683 /* p may have been set to a trailing space, so check s exists and that
685 if(s
&& (*s
!= '\0'))
687 /* a space? if not (H) could be the last part of info.. */
688 if((p
= strchr(s
, ' ')))
691 /* check for (H) which is a hidden server */
692 if(!strcmp(s
, "(H)"))
696 /* if there was no space.. theres nothing to set info to */
705 /* if there was a trailing space, s could point to \0, so check */
706 if(s
&& (*s
!= '\0'))
708 rb_strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
714 rb_strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
723 * output - 1 if a bogus hostname input, 0 if its valid
724 * side effects - none
727 bogus_host(const char *host
)
729 int bogus_server
= 0;
733 for(s
= host
; *s
; s
++)
744 if(!dots
|| bogus_server
)