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
26 #include "client.h" /* client struct */
27 #include "hash.h" /* add_to_client_hash */
29 #include "ircd.h" /* me */
30 #include "numeric.h" /* ERR_xxx */
31 #include "s_conf.h" /* struct ConfItem */
32 #include "s_newconf.h"
33 #include "logger.h" /* log level defines */
34 #include "s_serv.h" /* server_estab, check_server */
35 #include "s_stats.h" /* ServerStats */
37 #include "send.h" /* sendto_one */
42 static const char server_desc
[] =
43 "Provides the TS6 commands to introduce a new server to the network";
45 static void mr_server(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
46 static void ms_server(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
47 static void ms_sid(struct MsgBuf
*, struct Client
*, struct Client
*, int, const char **);
49 static bool bogus_host(const char *host
);
50 static void set_server_gecos(struct Client
*, const char *);
52 struct Message server_msgtab
= {
54 {{mr_server
, 4}, mg_reg
, mg_ignore
, {ms_server
, 4}, mg_ignore
, mg_reg
}
56 struct Message sid_msgtab
= {
58 {mg_ignore
, mg_reg
, mg_ignore
, {ms_sid
, 5}, mg_ignore
, mg_reg
}
61 mapi_clist_av1 server_clist
[] = { &server_msgtab
, &sid_msgtab
, NULL
};
63 DECLARE_MODULE_AV2(server
, NULL
, NULL
, server_clist
, NULL
, NULL
, NULL
, NULL
, server_desc
);
66 * mr_server - SERVER message handler
67 * parv[1] = servername
68 * parv[2] = serverinfo/hopcount
69 * parv[3] = serverinfo
72 mr_server(struct MsgBuf
*msgbuf_p
, 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
;
84 rb_strlcpy(info
, parv
[3], sizeof(info
));
86 if (IsHandshake(client_p
) && irccmp(client_p
->name
, name
))
88 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
89 "Server %s has unexpected name %s",
90 client_p
->name
, name
);
91 ilog(L_SERVER
, "Server %s has unexpected name %s",
92 log_client_name(client_p
, SHOW_IP
), name
);
93 exit_client(client_p
, client_p
, client_p
, "Server name mismatch");
98 * Reject a direct nonTS server connection if we're TS_ONLY -orabidoo
100 if(!DoesTS(client_p
))
102 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Link %s dropped, non-TS server",
104 exit_client(client_p
, client_p
, client_p
, "Non-TS server");
110 exit_client(client_p
, client_p
, client_p
, "Bogus server name");
114 /* Now we just have to call check_server and everything should be
115 * check for us... -A1kmm. */
116 ret
= check_server(name
, client_p
);
123 if(ConfigFileEntry
.warn_no_nline
)
125 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
126 "Unauthorised server connection attempt from %s: "
127 "No entry for servername %s",
128 "[@255.255.255.255]", name
);
130 ilog(L_SERVER
, "Access denied, no connect block for server %s%s",
131 EmptyString(client_p
->name
) ? name
: "",
132 log_client_name(client_p
, SHOW_IP
));
135 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
141 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
142 "Unauthorised server connection attempt from %s: "
143 "Bad credentials for server %s",
144 "[@255.255.255.255]", name
);
146 ilog(L_SERVER
, "Access denied, invalid credentials for server %s%s",
147 EmptyString(client_p
->name
) ? name
: "",
148 log_client_name(client_p
, SHOW_IP
));
150 exit_client(client_p
, client_p
, client_p
, "Invalid credentials.");
156 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
157 "Unauthorised server connection attempt from %s: "
158 "Invalid host for server %s",
159 "[@255.255.255.255]", name
);
161 ilog(L_SERVER
, "Access denied, invalid host for server %s%s",
162 EmptyString(client_p
->name
) ? name
: "",
163 log_client_name(client_p
, SHOW_IP
));
165 exit_client(client_p
, client_p
, client_p
, "Invalid host.");
170 /* servername is > HOSTLEN */
172 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
173 "Invalid servername %s from %s",
174 name
, "[@255.255.255.255]");
175 ilog(L_SERVER
, "Access denied, invalid servername from %s",
176 log_client_name(client_p
, SHOW_IP
));
178 exit_client(client_p
, client_p
, client_p
, "Invalid servername.");
183 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
184 "Connection from servername %s requires SSL/TLS but is plaintext",
186 ilog(L_SERVER
, "Access denied, requires SSL/TLS but is plaintext from %s",
187 log_client_name(client_p
, SHOW_IP
));
189 exit_client(client_p
, client_p
, client_p
, "Access denied, requires SSL/TLS but is plaintext");
192 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
193 "Connection from servername %s has invalid certificate fingerprint %s",
194 name
, client_p
->certfp
);
195 ilog(L_SERVER
, "Access denied, invalid certificate fingerprint %s from %s",
196 client_p
->certfp
, log_client_name(client_p
, SHOW_IP
));
198 exit_client(client_p
, client_p
, client_p
, "Invalid fingerprint.");
201 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
202 "Connection from servername %s rejected, unknown error %d",
204 ilog(L_SERVER
, "Access denied, unknown error %d for server %s%s", ret
,
205 EmptyString(client_p
->name
) ? name
: "",
206 log_client_name(client_p
, SHOW_IP
));
208 exit_client(client_p
, client_p
, client_p
, "Unknown error.");
212 /* require TS6 for direct links */
213 if(!IsCapable(client_p
, CAP_TS6
))
215 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
216 "Link %s dropped, TS6 protocol is required", name
);
217 exit_client(client_p
, client_p
, client_p
, "Incompatible TS version");
221 /* check to ensure any "required" caps are set. --nenolod */
222 required_mask
= capability_index_get_required(serv_capindex
);
223 if (!IsCapable(client_p
, required_mask
))
225 missing
= capability_index_list(serv_capindex
, required_mask
&
226 ~client_p
->localClient
->caps
);
227 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
228 "Link %s dropped, required CAPABs [%s] are missing",
230 ilog(L_SERVER
, "Link %s%s dropped, required CAPABs [%s] are missing",
231 EmptyString(client_p
->name
) ? name
: "",
232 log_client_name(client_p
, SHOW_IP
), missing
);
233 /* Do not use '[' in the below message because it would cause
234 * it to be considered potentially unsafe (might disclose IP
237 sendto_one(client_p
, "ERROR :Missing required CAPABs (%s)", missing
);
238 exit_client(client_p
, client_p
, client_p
, "Missing required CAPABs");
243 if((target_p
= find_server(NULL
, name
)))
246 * This link is trying feed me a server that I already have
247 * access through another path -- multiple paths not accepted
248 * currently, kill this link immediately!!
250 * Rather than KILL the link which introduced it, KILL the
251 * youngest of the two links. -avalon
253 * Definitely don't do that here. This is from an unregistered
256 if (target_p
->servptr
->flags
& FLAGS_SERVICE
)
258 /* Assume any servers introduced by services
262 sendto_one(client_p
, "ERROR :Server juped.");
266 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
267 "Attempt to re-introduce server %s from %s",
268 name
, "[@255.255.255.255]");
269 ilog(L_SERVER
, "Attempt to re-introduce server %s from %s",
270 name
, log_client_name(client_p
, SHOW_IP
));
272 sendto_one(client_p
, "ERROR :Server already exists.");
274 exit_client(client_p
, client_p
, client_p
, "Server Exists");
278 if(has_id(client_p
) && (target_p
= find_id(client_p
->id
)) != NULL
)
280 sendto_realops_snomask(SNO_GENERAL
, is_remote_connect(client_p
) ? L_NETWIDE
: L_ALL
,
281 "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
283 EmptyString(client_p
->name
) ? name
: "",
284 client_p
->name
, target_p
->name
);
285 ilog(L_SERVER
, "Attempt to re-introduce SID %s from %s%s (already in use by %s)",
287 EmptyString(client_p
->name
) ? name
: "",
288 log_client_name(client_p
, SHOW_IP
),
291 sendto_one(client_p
, "ERROR :SID already exists.");
292 exit_client(client_p
, client_p
, client_p
, "SID Exists");
297 * if we are connecting (Handshake), we already have the name from the
298 * C:line in client_p->name
301 rb_strlcpy(client_p
->name
, name
, sizeof(client_p
->name
));
302 set_server_gecos(client_p
, info
);
303 client_p
->hopcount
= hop
;
304 server_estab(client_p
);
308 * ms_server - SERVER message handler
309 * parv[1] = servername
310 * parv[2] = serverinfo/hopcount
311 * parv[3] = serverinfo
314 ms_server(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
316 char info
[REALLEN
+ 1];
317 /* same size as in s_misc.c */
319 struct Client
*target_p
;
320 struct remote_conf
*hub_p
;
321 hook_data_client hdata
;
326 char squitreason
[160];
330 rb_strlcpy(info
, parv
[3], sizeof(info
));
332 if(find_server(NULL
, name
))
335 * This link is trying feed me a server that I already have
336 * access through another path -- multiple paths not accepted
337 * currently, kill this link immediately!!
339 * Rather than KILL the link which introduced it, KILL the
340 * youngest of the two links. -avalon
342 * I think that we should exit the link itself, not the introducer,
343 * and we should always exit the most recently received(i.e. the
344 * one we are receiving this SERVER for. -A1kmm
346 * You *cant* do this, if you link somewhere, it bursts you a server
347 * that already exists, then sends you a client burst, you squit the
348 * server, but you keep getting the burst of clients on a server that
349 * doesnt exist, although ircd can handle it, its not a realistic
352 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
353 client_p
->name
, name
);
355 snprintf(squitreason
, sizeof squitreason
,
356 "Server %s already exists",
358 exit_client(client_p
, client_p
, &me
, squitreason
);
363 * User nicks never have '.' in them and server names
364 * must always have '.' in them.
366 if(strchr(name
, '.') == NULL
)
369 * Server trying to use the same name as a person. Would
370 * cause a fair bit of confusion. Enough to make it hellish
371 * for a while and servers to send stuff to the wrong place.
373 sendto_one(client_p
, "ERROR :Nickname %s already exists!", name
);
374 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
375 "Link %s cancelled: Server/nick collision on %s",
376 client_p
->name
, name
);
377 ilog(L_SERVER
, "Link %s cancelled: Server/nick collision on %s",
378 client_p
->name
, name
);
380 exit_client(client_p
, client_p
, client_p
, "Nick as Server");
385 * Server is informing about a new server behind
386 * this link. Create REMOTE server structure,
387 * add it to list and propagate word to my other
392 * See if the newly found server is behind a guaranteed
393 * leaf. If so, close the link.
396 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
400 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, name
))
402 if(hub_p
->flags
& CONF_HUB
)
409 /* Ok, this way this works is
411 * A server can have a CONF_HUB allowing it to introduce servers
415 * name = "irc.bighub.net";
419 * That would allow "irc.bighub.net" to introduce anything it wanted..
424 * name = "irc.somehub.fi";
428 * Would allow this server in finland to hub anything but
432 /* Ok, check client_p can hub the new server */
435 /* OOOPs nope can't HUB */
436 sendto_realops_snomask(SNO_GENERAL
, L_ALL
, "Non-Hub link %s introduced %s.",
437 client_p
->name
, name
);
438 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
439 client_p
->name
, name
);
441 snprintf(squitreason
, sizeof squitreason
,
442 "No matching hub_mask for %s",
444 exit_client(NULL
, client_p
, &me
, squitreason
);
448 /* Check for the new server being leafed behind this HUB */
451 /* OOOPs nope can't HUB this leaf */
452 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
453 "Link %s introduced leafed server %s.",
454 client_p
->name
, name
);
455 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
456 client_p
->name
, name
);
458 snprintf(squitreason
, sizeof squitreason
,
459 "Matching leaf_mask for %s",
461 exit_client(NULL
, client_p
, &me
, squitreason
);
467 if(strlen(name
) > HOSTLEN
)
469 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
470 "Link %s introduced server with invalid servername %s",
471 client_p
->name
, name
);
472 ilog(L_SERVER
, "Link %s introduced server with invalid servername %s",
473 client_p
->name
, name
);
475 exit_client(NULL
, client_p
, &me
, "Invalid servername introduced.");
479 target_p
= make_client(client_p
);
480 make_server(target_p
);
481 target_p
->hopcount
= hop
;
483 rb_strlcpy(target_p
->name
, name
, sizeof(target_p
->name
));
485 set_server_gecos(target_p
, info
);
487 target_p
->servptr
= source_p
;
491 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
492 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
493 add_to_client_hash(target_p
->name
, target_p
);
494 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
496 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
498 sendto_server(client_p
, NULL
, NOCAPS
, NOCAPS
,
499 ":%s SERVER %s %d :%s%s",
500 source_p
->name
, target_p
->name
, target_p
->hopcount
+ 1,
501 IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
503 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
504 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
506 /* quick, dirty EOB. you know you love it. */
507 sendto_one(target_p
, ":%s PING %s %s", get_id(&me
, target_p
), me
.name
, target_p
->name
);
509 hdata
.client
= source_p
;
510 hdata
.target
= target_p
;
511 call_hook(h_server_introduced
, &hdata
);
515 ms_sid(struct MsgBuf
*msgbuf_p
, struct Client
*client_p
, struct Client
*source_p
, int parc
, const char *parv
[])
517 struct Client
*target_p
;
518 struct remote_conf
*hub_p
;
519 hook_data_client hdata
;
523 char squitreason
[160];
525 /* collision on the name? */
526 if(find_server(NULL
, parv
[1]) != NULL
)
528 ilog(L_SERVER
, "Link %s cancelled, server %s already exists",
529 client_p
->name
, parv
[1]);
531 snprintf(squitreason
, sizeof squitreason
,
532 "Server %s already exists",
534 exit_client(NULL
, client_p
, &me
, squitreason
);
538 /* collision on the SID? */
539 if((target_p
= find_id(parv
[3])) != NULL
)
541 sendto_wallops_flags(UMODE_WALLOP
, &me
,
542 "Link %s cancelled, SID %s for server %s already in use by %s",
543 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
544 sendto_server(NULL
, NULL
, CAP_TS6
, NOCAPS
,
545 ":%s WALLOPS :Link %s cancelled, SID %s for server %s already in use by %s",
546 me
.id
, client_p
->name
, parv
[3], parv
[1], target_p
->name
);
547 ilog(L_SERVER
, "Link %s cancelled, SID %s for server %s already in use by %s",
548 client_p
->name
, parv
[3], parv
[1], target_p
->name
);
550 snprintf(squitreason
, sizeof squitreason
,
551 "SID %s for %s already in use by %s",
552 parv
[3], parv
[1], target_p
->name
);
553 exit_client(NULL
, client_p
, &me
, squitreason
);
557 if(bogus_host(parv
[1]) || strlen(parv
[1]) > HOSTLEN
)
559 sendto_one(client_p
, "ERROR :Invalid servername");
560 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
561 "Link %s cancelled, servername %s invalid",
562 client_p
->name
, parv
[1]);
563 ilog(L_SERVER
, "Link %s cancelled, servername %s invalid",
564 client_p
->name
, parv
[1]);
566 exit_client(NULL
, client_p
, &me
, "Bogus server name");
570 if(!IsDigit(parv
[3][0]) || !IsIdChar(parv
[3][1]) ||
571 !IsIdChar(parv
[3][2]) || parv
[3][3] != '\0')
573 sendto_one(client_p
, "ERROR :Invalid SID");
574 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
575 "Link %s cancelled, SID %s invalid",
576 client_p
->name
, parv
[3]);
577 ilog(L_SERVER
, "Link %s cancelled, SID %s invalid",
578 client_p
->name
, parv
[3]);
580 exit_client(NULL
, client_p
, &me
, "Bogus SID");
584 /* for the directly connected server:
585 * H: allows it to introduce a server matching that mask
586 * L: disallows it introducing a server matching that mask
588 RB_DLINK_FOREACH(ptr
, hubleaf_conf_list
.head
)
592 if(match(hub_p
->server
, client_p
->name
) && match(hub_p
->host
, parv
[1]))
594 if(hub_p
->flags
& CONF_HUB
)
601 /* no matching hub_mask */
604 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
605 "Non-Hub link %s introduced %s.",
606 client_p
->name
, parv
[1]);
607 ilog(L_SERVER
, "Non-Hub link %s introduced %s.",
608 client_p
->name
, parv
[1]);
610 snprintf(squitreason
, sizeof squitreason
,
611 "No matching hub_mask for %s",
613 exit_client(NULL
, client_p
, &me
, squitreason
);
617 /* matching leaf_mask */
620 sendto_realops_snomask(SNO_GENERAL
, L_ALL
,
621 "Link %s introduced leafed server %s.",
622 client_p
->name
, parv
[1]);
623 ilog(L_SERVER
, "Link %s introduced leafed server %s.",
624 client_p
->name
, parv
[1]);
626 snprintf(squitreason
, sizeof squitreason
,
627 "Matching leaf_mask for %s",
629 exit_client(NULL
, client_p
, &me
, squitreason
);
634 target_p
= make_client(client_p
);
635 make_server(target_p
);
637 rb_strlcpy(target_p
->name
, parv
[1], sizeof(target_p
->name
));
638 target_p
->hopcount
= atoi(parv
[2]);
639 strcpy(target_p
->id
, parv
[3]);
640 set_server_gecos(target_p
, parv
[4]);
642 target_p
->servptr
= source_p
;
645 rb_dlinkAddTail(target_p
, &target_p
->node
, &global_client_list
);
646 rb_dlinkAddTailAlloc(target_p
, &global_serv_list
);
647 add_to_client_hash(target_p
->name
, target_p
);
648 add_to_id_hash(target_p
->id
, target_p
);
649 rb_dlinkAdd(target_p
, &target_p
->lnode
, &target_p
->servptr
->serv
->servers
);
651 target_p
->serv
->nameinfo
= scache_connect(target_p
->name
, target_p
->info
, IsHidden(target_p
));
653 sendto_server(client_p
, NULL
, CAP_TS6
, NOCAPS
,
654 ":%s SID %s %d %s :%s%s",
655 source_p
->id
, target_p
->name
, target_p
->hopcount
+ 1,
656 target_p
->id
, IsHidden(target_p
) ? "(H) " : "", target_p
->info
);
658 sendto_realops_snomask(SNO_EXTERNAL
, L_ALL
,
659 "Server %s being introduced by %s", target_p
->name
, source_p
->name
);
661 /* quick, dirty EOB. you know you love it. */
662 sendto_one(target_p
, ":%s PING %s %s",
663 get_id(&me
, target_p
), me
.name
, get_id(target_p
, target_p
));
665 hdata
.client
= source_p
;
666 hdata
.target
= target_p
;
667 call_hook(h_server_introduced
, &hdata
);
670 /* set_server_gecos()
672 * input - pointer to client
674 * side effects - servers gecos field is set
677 set_server_gecos(struct Client
*client_p
, const char *info
)
679 /* check the info for [IP] */
685 s
= LOCAL_COPY(info
);
687 /* we should only check the first word for an ip */
688 if((p
= strchr(s
, ' ')))
691 /* check for a ] which would symbolise an [IP] */
694 /* set s to after the first space */
700 /* no ], put the space back */
704 /* p may have been set to a trailing space, so check s exists and that
706 if(s
&& (*s
!= '\0'))
708 /* a space? if not (H) could be the last part of info.. */
709 if((p
= strchr(s
, ' ')))
712 /* check for (H) which is a hidden server */
713 if(!strcmp(s
, "(H)"))
717 /* if there was no space.. theres nothing to set info to */
726 /* if there was a trailing space, s could point to \0, so check */
727 if(s
&& (*s
!= '\0'))
729 rb_strlcpy(client_p
->info
, s
, sizeof(client_p
->info
));
735 rb_strlcpy(client_p
->info
, "(Unknown Location)", sizeof(client_p
->info
));
742 * output - true if a bogus hostname input, false if its valid
743 * side effects - none
746 bogus_host(const char *host
)
748 bool bogus_server
= false;
752 for(s
= host
; *s
; s
++)
763 if(!dots
|| bogus_server
)