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 unsigned int required_mask
;
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 credentials for server %s",
138 "[@255.255.255.255]", name
);
140 ilog(L_SERVER
, "Access denied, invalid credentials 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 credentials.");
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 /* check to ensure any "required" caps are set. --nenolod */
197 /* XXX: show required CAPABs. */
198 required_mask
= capability_index_get_required(serv_capindex
);
199 if (!IsCapable(client_p
, required_mask
))
201 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
202 "Link %s dropped, required CAPABs are missing", name
);
203 ilog(L_SERVER
, "Link %s%s dropped, required CAPABs are missing",
204 EmptyString(client_p
->name
) ? name
: "",
205 log_client_name(client_p
, SHOW_IP
));
206 exit_client(client_p
, client_p
, client_p
, "Missing required CAPABs");
211 if((target_p
= find_server(NULL
, name
)))
214 * This link is trying feed me a server that I already have
215 * access through another path -- multiple paths not accepted
216 * currently, kill this link immediately!!
218 * Rather than KILL the link which introduced it, KILL the
219 * youngest of the two links. -avalon
221 * Definitely don't do that here. This is from an unregistered
224 if (target_p
->servptr
->flags
& FLAGS_SERVICE
)
226 /* Assume any servers introduced by services
230 sendto_one(client_p
, "ERROR :Server juped.");
234 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
235 "Attempt to re-introduce server %s from %s",
236 name
, "[@255.255.255.255]");
237 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
238 name
, log_client_name(client_p
, SHOW_IP
));
240 sendto_one(client_p
, "ERROR :Server already exists.");
242 exit_client(client_p
, client_p
, client_p
, "Server Exists");
246 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
248 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
249 "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
251 EmptyString(client_p
->name
) ? name
: "",
252 client_p
->name
, target_p
->name
);
253 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
255 EmptyString(client_p
->name
) ? name
: "",
256 log_client_name(client_p
, SHOW_IP
),
259 sendto_one(client_p
, "ERROR :SID already exists.");
260 exit_client(client_p
, client_p
, client_p
, "SID Exists");
265 * if we are connecting (Handshake), we already have the name from the
266 * C:line in client_p->name
269 rb_strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
270 set_server_gecos(client_p
, info
);
271 client_p
->hopcount
= hop
;
272 server_estab(client_p
);
278 * ms_server - SERVER message handler
279 * parv[1] = servername
280 * parv[2] = serverinfo/hopcount
281 * parv[3] = serverinfo
284 ms_server(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
286 char info
[REALLEN
+ 1];
287 /* same size as in s_misc.c */
289 struct Client
*target_p
;
290 struct remote_conf
*hub_p
;
291 hook_data_client hdata
;
296 char squitreason
[160];
300 rb_strlcpy(info
, parv
[3], sizeof(info
));
302 if((target_p
= find_server(NULL
, name
)))
305 * This link is trying feed me a server that I already have
306 * access through another path -- multiple paths not accepted
307 * currently, kill this link immediately!!
309 * Rather than KILL the link which introduced it, KILL the
310 * youngest of the two links. -avalon
312 * I think that we should exit the link itself, not the introducer,
313 * and we should always exit the most recently received(i.e. the
314 * one we are receiving this SERVER for. -A1kmm
316 * You *cant* do this, if you link somewhere, it bursts you a server
317 * that already exists, then sends you a client burst, you squit the
318 * server, but you keep getting the burst of clients on a server that
319 * doesnt exist, although ircd can handle it, its not a realistic
322 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
323 client_p
->name
, name
);
325 rb_snprintf(squitreason
, sizeof squitreason
,
326 "Server %s already exists",
328 exit_client(client_p
, client_p
, &me
, squitreason
);
333 * User nicks never have '.' in them and server names
334 * must always have '.' in them.
336 if(strchr(name
, '.') == NULL
)
339 * Server trying to use the same name as a person. Would
340 * cause a fair bit of confusion. Enough to make it hellish
341 * for a while and servers to send stuff to the wrong place.
343 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
344 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
345 "Link %s cancelled: Server/nick collision on %s",
346 client_p
->name
, name
);
347 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
348 client_p
->name
, name
);
350 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
355 * Server is informing about a new server behind
356 * this link. Create REMOTE server structure,
357 * add it to list and propagate word to my other
362 * See if the newly found server is behind a guaranteed
363 * leaf. If so, close the link.
366 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
370 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
372 if(hub_p
->flags
& CONF_HUB
)
379 /* Ok, this way this works is
381 * A server can have a CONF_HUB allowing it to introduce servers
385 * name = "irc.bighub.net";
389 * That would allow "irc.bighub.net" to introduce anything it wanted..
394 * name = "irc.somehub.fi";
398 * Would allow this server in finland to hub anything but
402 /* Ok, check client_p can hub the new server */
405 /* OOOPs nope can't HUB */
406 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
407 client_p
->name
, name
);
408 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
409 client_p
->name
, name
);
411 rb_snprintf(squitreason
, sizeof squitreason
,
412 "No matching hub_mask for %s",
414 exit_client(NULL
, client_p
, &me
, squitreason
);
418 /* Check for the new server being leafed behind this HUB */
421 /* OOOPs nope can't HUB this leaf */
422 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
423 "Link %s introduced leafed server %s.",
424 client_p
->name
, name
);
425 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
426 client_p
->name
, name
);
428 rb_snprintf(squitreason
, sizeof squitreason
,
429 "Matching leaf_mask for %s",
431 exit_client(NULL
, client_p
, &me
, squitreason
);
437 if(strlen(name
) > HOSTLEN
)
439 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
440 "Link %s introduced server with invalid servername %s",
441 client_p
->name
, name
);
442 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
443 client_p
->name
, name
);
445 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
449 target_p
= make_client(client_p
);
450 make_server(target_p
);
451 target_p
->hopcount
= hop
;
453 rb_strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
455 set_server_gecos(target_p
, info
);
457 target_p
->servptr
= source_p
;
461 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
462 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
463 add_to_client_hash(target_p
->name
, target_p
);
464 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
466 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
468 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
469 ":%s SERVER %s %d :%s%s",
470 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
471 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
473 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
474 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
476 /* quick, dirty EOB. you know you love it. */
477 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
479 hdata
.client
= source_p
;
480 hdata
.target
= target_p
;
481 call_hook(h_server_introduced
, &hdata
);
487 ms_sid(struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
489 struct Client
*target_p
;
490 struct remote_conf
*hub_p
;
491 hook_data_client hdata
;
495 char squitreason
[160];
497 /* collision on the name? */
498 if((target_p
= find_server(NULL
, parv
[1])) != NULL
)
500 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
501 client_p
->name
, parv
[1]);
503 rb_snprintf(squitreason
, sizeof squitreason
,
504 "Server %s already exists",
506 exit_client(NULL
, client_p
, &me
, squitreason
);
510 /* collision on the SID? */
511 if((target_p
= find_id(parv
[3])) != NULL
)
513 sendto_wallops_flags(UMODE_WALLOP
, &me
,
514 "Link %s cancelled, SID %s for server %s already in use by %s",
515 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
516 sendto_server(NULL
, NULL
, CAP_TS6
, NOCAPS
,
517 ":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
518 me
.id
, client_p
->name
, parv
[3], parv
[1], target_p
->name
);
519 ilog(L_SERVER
, "Link %s cancelled, SID %s for server %s already in use by %s",
520 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
522 rb_snprintf(squitreason
, sizeof squitreason
,
523 "SID %s for %s already in use by %s",
524 parv
[3], parv
[1], target_p
->name
);
525 exit_client(NULL
, client_p
, &me
, squitreason
);
529 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
531 sendto_one(client_p
, "ERROR :Invalid servername");
532 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
533 "Link %s cancelled, servername %s invalid",
534 client_p
->name
, parv
[1]);
535 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
536 client_p
->name
, parv
[1]);
538 exit_client(NULL
, client_p
, &me
, "Bogus server name");
542 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
543 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
545 sendto_one(client_p
, "ERROR :Invalid SID");
546 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
547 "Link %s cancelled, SID %s invalid",
548 client_p
->name
, parv
[3]);
549 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
550 client_p
->name
, parv
[3]);
552 exit_client(NULL
, client_p
, &me
, "Bogus SID");
556 /* for the directly connected server:
557 * H: allows it to introduce a server matching that mask
558 * L: disallows it introducing a server matching that mask
560 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
564 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
566 if(hub_p
->flags
& CONF_HUB
)
573 /* no matching hub_mask */
576 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
577 "Non-Hub link %s introduced %s.",
578 client_p
->name
, parv
[1]);
579 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
580 client_p
->name
, parv
[1]);
582 rb_snprintf(squitreason
, sizeof squitreason
,
583 "No matching hub_mask for %s",
585 exit_client(NULL
, client_p
, &me
, squitreason
);
589 /* matching leaf_mask */
592 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
593 "Link %s introduced leafed server %s.",
594 client_p
->name
, parv
[1]);
595 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
596 client_p
->name
, parv
[1]);
598 rb_snprintf(squitreason
, sizeof squitreason
,
599 "Matching leaf_mask for %s",
601 exit_client(NULL
, client_p
, &me
, squitreason
);
606 target_p
= make_client(client_p
);
607 make_server(target_p
);
609 rb_strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
610 target_p
->hopcount
= atoi(parv
[2]);
611 strcpy(target_p
->id
, parv
[3]);
612 set_server_gecos(target_p
, parv
[4]);
614 target_p
->servptr
= source_p
;
617 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
618 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
619 add_to_client_hash(target_p
->name
, target_p
);
620 add_to_id_hash(target_p
->id
, target_p
);
621 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
623 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
625 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
626 ":%s SID %s %d %s :%s%s",
627 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
628 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
630 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
631 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
633 /* quick, dirty EOB. you know you love it. */
634 sendto_one(target_p
, ":%s PING %s %s",
635 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
637 hdata
.client
= source_p
;
638 hdata
.target
= target_p
;
639 call_hook(h_server_introduced
, &hdata
);
644 /* set_server_gecos()
646 * input - pointer to client
648 * side effects - servers gecos field is set
651 set_server_gecos(struct Client
*client_p
, const char *info
)
653 /* check the info for [IP] */
659 s
= LOCAL_COPY(info
);
661 /* we should only check the first word for an ip */
662 if((p
= strchr(s
, ' ')))
665 /* check for a ] which would symbolise an [IP] */
668 /* set s to after the first space */
674 /* no ], put the space back */
678 /* p may have been set to a trailing space, so check s exists and that
680 if(s
&& (*s
!= '\0'))
682 /* a space? if not (H) could be the last part of info.. */
683 if((p
= strchr(s
, ' ')))
686 /* check for (H) which is a hidden server */
687 if(!strcmp(s
, "(H)"))
691 /* if there was no space.. theres nothing to set info to */
700 /* if there was a trailing space, s could point to \0, so check */
701 if(s
&& (*s
!= '\0'))
703 rb_strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
709 rb_strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
718 * output - 1 if a bogus hostname input, 0 if its valid
719 * side effects - none
722 bogus_host(const char *host
)
724 int bogus_server
= 0;
728 for(s
= host
; *s
; s
++)
739 if(!dots
|| bogus_server
)