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
;
81 rb_strlcpy(info
, parv
[3], sizeof(info
));
83 if (IsHandshake(client_p
) && irccmp(client_p
->name
, name
))
85 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
86 "Server %s has unexpected name %s",
87 client_p
->name
, name
);
88 ilog(L_SERVER
, "Server %s has unexpected name %s",
89 log_client_name(client_p
, SHOW_IP
), name
);
90 exit_client(client_p
, client_p
, client_p
, "Server name mismatch");
95 * Reject a direct nonTS server connection if we're TS_ONLY -orabidoo
99 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Link %s dropped, non-TS server",
101 exit_client(client_p
, client_p
, client_p
, "Non-TS server");
107 exit_client(client_p
, client_p
, client_p
, "Bogus server name");
111 /* Now we just have to call check_server and everything should be
112 * check for us... -A1kmm. */
113 switch (check_server(name
, client_p
))
116 if(ConfigFileEntry
.warn_no_nline
)
118 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
119 "Unauthorised server connection attempt from %s: "
120 "No entry for servername %s",
121 "[@255.255.255.255]", name
);
123 ilog(L_SERVER
, "Access denied, no connect block for server %s%s",
124 EmptyString(client_p
->name
) ? name
: "",
125 log_client_name(client_p
, SHOW_IP
));
128 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
134 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
135 "Unauthorised server connection attempt from %s: "
136 "Bad password for server %s",
137 "[@255.255.255.255]", name
);
139 ilog(L_SERVER
, "Access denied, invalid password for server %s%s",
140 EmptyString(client_p
->name
) ? name
: "",
141 log_client_name(client_p
, SHOW_IP
));
143 exit_client(client_p
, client_p
, client_p
, "Invalid password.");
149 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
150 "Unauthorised server connection attempt from %s: "
151 "Invalid host for server %s",
152 "[@255.255.255.255]", name
);
154 ilog(L_SERVER
, "Access denied, invalid host for server %s%s",
155 EmptyString(client_p
->name
) ? name
: "",
156 log_client_name(client_p
, SHOW_IP
));
158 exit_client(client_p
, client_p
, client_p
, "Invalid host.");
163 /* servername is > HOSTLEN */
165 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
166 "Invalid servername %s from %s",
167 name
, "[@255.255.255.255]");
168 ilog(L_SERVER
, "Access denied, invalid servername from %s",
169 log_client_name(client_p
, SHOW_IP
));
171 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
176 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
177 "Connection from servername %s requires SSL/TLS but is plaintext",
179 ilog(L_SERVER
, "Access denied, requires SSL/TLS but is plaintext from %s",
180 log_client_name(client_p
, SHOW_IP
));
182 exit_client(client_p
, client_p
, client_p
, "Access denied, requires SSL/TLS but is plaintext");
186 /* require TS6 for direct links */
187 if(!IsCapable(client_p
, CAP_TS6
))
189 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
190 "Link %s dropped, TS6 protocol is required", name
);
191 exit_client(client_p
, client_p
, client_p
, "Incompatible TS version");
195 if((target_p
= find_server(NULL
, name
)))
198 * This link is trying feed me a server that I already have
199 * access through another path -- multiple paths not accepted
200 * currently, kill this link immediately!!
202 * Rather than KILL the link which introduced it, KILL the
203 * youngest of the two links. -avalon
205 * Definitely don't do that here. This is from an unregistered
208 if (target_p
->servptr
->flags
& FLAGS_SERVICE
)
210 /* Assume any servers introduced by services
214 sendto_one(client_p
, "ERROR :Server juped.");
218 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
219 "Attempt to re-introduce server %s from %s",
220 name
, "[@255.255.255.255]");
221 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
222 name
, log_client_name(client_p
, SHOW_IP
));
224 sendto_one(client_p
, "ERROR :Server already exists.");
226 exit_client(client_p
, client_p
, client_p
, "Server Exists");
230 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
232 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
233 "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
235 EmptyString(client_p
->name
) ? name
: "",
236 client_p
->name
, target_p
->name
);
237 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
239 EmptyString(client_p
->name
) ? name
: "",
240 log_client_name(client_p
, SHOW_IP
),
243 sendto_one(client_p
, "ERROR :SID already exists.");
244 exit_client(client_p
, client_p
, client_p
, "SID Exists");
249 * if we are connecting (Handshake), we already have the name from the
250 * C:line in client_p->name
253 rb_strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
254 set_server_gecos(client_p
, info
);
255 client_p
->hopcount
= hop
;
256 server_estab(client_p
);
262 * ms_server - SERVER message handler
263 * parv[1] = servername
264 * parv[2] = serverinfo/hopcount
265 * parv[3] = serverinfo
268 ms_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
270 char info
[REALLEN
+ 1];
271 /* same size as in s_misc.c */
273 struct Client
*target_p
;
274 struct remote_conf
*hub_p
;
275 hook_data_client hdata
;
280 char squitreason
[160];
284 rb_strlcpy(info
, parv
[3], sizeof(info
));
286 if((target_p
= find_server(NULL
, name
)))
289 * This link is trying feed me a server that I already have
290 * access through another path -- multiple paths not accepted
291 * currently, kill this link immediately!!
293 * Rather than KILL the link which introduced it, KILL the
294 * youngest of the two links. -avalon
296 * I think that we should exit the link itself, not the introducer,
297 * and we should always exit the most recently received(i.e. the
298 * one we are receiving this SERVER for. -A1kmm
300 * You *cant* do this, if you link somewhere, it bursts you a server
301 * that already exists, then sends you a client burst, you squit the
302 * server, but you keep getting the burst of clients on a server that
303 * doesnt exist, although ircd can handle it, its not a realistic
306 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
307 client_p
->name
, name
);
309 rb_snprintf(squitreason
, sizeof squitreason
,
310 "Server %s already exists",
312 exit_client(client_p
, client_p
, &me
, squitreason
);
317 * User nicks never have '.' in them and server names
318 * must always have '.' in them.
320 if(strchr(name
, '.') == NULL
)
323 * Server trying to use the same name as a person. Would
324 * cause a fair bit of confusion. Enough to make it hellish
325 * for a while and servers to send stuff to the wrong place.
327 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
328 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
329 "Link %s cancelled: Server/nick collision on %s",
330 client_p
->name
, name
);
331 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
332 client_p
->name
, name
);
334 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
339 * Server is informing about a new server behind
340 * this link. Create REMOTE server structure,
341 * add it to list and propagate word to my other
346 * See if the newly found server is behind a guaranteed
347 * leaf. If so, close the link.
350 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
354 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
356 if(hub_p
->flags
& CONF_HUB
)
363 /* Ok, this way this works is
365 * A server can have a CONF_HUB allowing it to introduce servers
369 * name = "irc.bighub.net";
373 * That would allow "irc.bighub.net" to introduce anything it wanted..
378 * name = "irc.somehub.fi";
382 * Would allow this server in finland to hub anything but
386 /* Ok, check client_p can hub the new server */
389 /* OOOPs nope can't HUB */
390 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
391 client_p
->name
, name
);
392 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
393 client_p
->name
, name
);
395 rb_snprintf(squitreason
, sizeof squitreason
,
396 "No matching hub_mask for %s",
398 exit_client(NULL
, client_p
, &me
, squitreason
);
402 /* Check for the new server being leafed behind this HUB */
405 /* OOOPs nope can't HUB this leaf */
406 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
407 "Link %s introduced leafed server %s.",
408 client_p
->name
, name
);
409 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
410 client_p
->name
, name
);
412 rb_snprintf(squitreason
, sizeof squitreason
,
413 "Matching leaf_mask for %s",
415 exit_client(NULL
, client_p
, &me
, squitreason
);
421 if(strlen(name
) > HOSTLEN
)
423 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
424 "Link %s introduced server with invalid servername %s",
425 client_p
->name
, name
);
426 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
427 client_p
->name
, name
);
429 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
433 target_p
= make_client(client_p
);
434 make_server(target_p
);
435 target_p
->hopcount
= hop
;
437 rb_strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
439 set_server_gecos(target_p
, info
);
441 target_p
->servptr
= source_p
;
445 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
446 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
447 add_to_client_hash(target_p
->name
, target_p
);
448 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
450 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
452 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
453 ":%s SERVER %s %d :%s%s",
454 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
455 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
457 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
458 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
460 /* quick, dirty EOB. you know you love it. */
461 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
463 hdata
.client
= source_p
;
464 hdata
.target
= target_p
;
465 call_hook(h_server_introduced
, &hdata
);
471 ms_sid(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
473 struct Client
*target_p
;
474 struct remote_conf
*hub_p
;
475 hook_data_client hdata
;
480 char squitreason
[160];
484 /* collision on the name? */
485 if((target_p
= find_server(NULL
, parv
[1])) != NULL
)
487 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
488 client_p
->name
, parv
[1]);
490 rb_snprintf(squitreason
, sizeof squitreason
,
491 "Server %s already exists",
493 exit_client(NULL
, client_p
, &me
, squitreason
);
497 /* collision on the SID? */
498 if((target_p
= find_id(parv
[3])) != NULL
)
500 sendto_wallops_flags(UMODE_WALLOP
, &me
,
501 "Link %s cancelled, SID %s for server %s already in use by %s",
502 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
503 sendto_server(NULL
, NULL
, CAP_TS6
, NOCAPS
,
504 ":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
505 me
.id
, client_p
->name
, parv
[3], parv
[1], target_p
->name
);
506 ilog(L_SERVER
, "Link %s cancelled, SID %s for server %s already in use by %s",
507 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
509 rb_snprintf(squitreason
, sizeof squitreason
,
510 "SID %s for %s already in use by %s",
511 parv
[3], parv
[1], target_p
->name
);
512 exit_client(NULL
, client_p
, &me
, squitreason
);
516 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
518 sendto_one(client_p
, "ERROR :Invalid servername");
519 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
520 "Link %s cancelled, servername %s invalid",
521 client_p
->name
, parv
[1]);
522 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
523 client_p
->name
, parv
[1]);
525 exit_client(NULL
, client_p
, &me
, "Bogus server name");
529 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
530 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
532 sendto_one(client_p
, "ERROR :Invalid SID");
533 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
534 "Link %s cancelled, SID %s invalid",
535 client_p
->name
, parv
[3]);
536 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
537 client_p
->name
, parv
[3]);
539 exit_client(NULL
, client_p
, &me
, "Bogus SID");
543 /* for the directly connected server:
544 * H: allows it to introduce a server matching that mask
545 * L: disallows it introducing a server matching that mask
547 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
551 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
553 if(hub_p
->flags
& CONF_HUB
)
560 /* no matching hub_mask */
563 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
564 "Non-Hub link %s introduced %s.",
565 client_p
->name
, parv
[1]);
566 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
567 client_p
->name
, parv
[1]);
569 rb_snprintf(squitreason
, sizeof squitreason
,
570 "No matching hub_mask for %s",
572 exit_client(NULL
, client_p
, &me
, squitreason
);
576 /* matching leaf_mask */
579 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
580 "Link %s introduced leafed server %s.",
581 client_p
->name
, parv
[1]);
582 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
583 client_p
->name
, parv
[1]);
585 rb_snprintf(squitreason
, sizeof squitreason
,
586 "Matching leaf_mask for %s",
588 exit_client(NULL
, client_p
, &me
, squitreason
);
593 target_p
= make_client(client_p
);
594 make_server(target_p
);
596 rb_strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
597 target_p
->hopcount
= atoi(parv
[2]);
598 strcpy(target_p
->id
, parv
[3]);
599 set_server_gecos(target_p
, parv
[4]);
601 target_p
->servptr
= source_p
;
604 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
605 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
606 add_to_client_hash(target_p
->name
, target_p
);
607 add_to_id_hash(target_p
->id
, target_p
);
608 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
610 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
612 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
613 ":%s SID %s %d %s :%s%s",
614 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
615 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
617 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
618 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
620 /* quick, dirty EOB. you know you love it. */
621 sendto_one(target_p
, ":%s PING %s %s",
622 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
624 hdata
.client
= source_p
;
625 hdata
.target
= target_p
;
626 call_hook(h_server_introduced
, &hdata
);
631 /* set_server_gecos()
633 * input - pointer to client
635 * side effects - servers gecos field is set
638 set_server_gecos(struct Client
*client_p
, const char *info
)
640 /* check the info for [IP] */
647 s
= LOCAL_COPY(info
);
649 /* we should only check the first word for an ip */
650 if((p
= strchr(s
, ' ')))
653 /* check for a ] which would symbolise an [IP] */
654 if((t
= strchr(s
, ']')))
656 /* set s to after the first space */
662 /* no ], put the space back */
666 /* p may have been set to a trailing space, so check s exists and that
668 if(s
&& (*s
!= '\0'))
670 /* a space? if not (H) could be the last part of info.. */
671 if((p
= strchr(s
, ' ')))
674 /* check for (H) which is a hidden server */
675 if(!strcmp(s
, "(H)"))
679 /* if there was no space.. theres nothing to set info to */
688 /* if there was a trailing space, s could point to \0, so check */
689 if(s
&& (*s
!= '\0'))
691 rb_strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
697 rb_strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
706 * output - 1 if a bogus hostname input, 0 if its valid
707 * side effects - none
710 bogus_host(const char *host
)
712 int bogus_server
= 0;
716 for(s
= host
; *s
; s
++)
727 if(!dots
|| bogus_server
)