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1 | /* | |
2 | * ircd-ratbox: A slightly useful ircd. | |
3 | * m_server.c: Introduces a server. | |
4 | * | |
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 | |
8 | * | |
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. | |
13 | * | |
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. | |
18 | * | |
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 | |
22 | * USA | |
23 | */ | |
24 | ||
25 | #include "stdinc.h" | |
26 | #include "client.h" /* client struct */ | |
27 | #include "hash.h" /* add_to_client_hash */ | |
28 | #include "match.h" | |
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 */ | |
36 | #include "scache.h" | |
37 | #include "send.h" /* sendto_one */ | |
38 | #include "msg.h" | |
39 | #include "parse.h" | |
40 | #include "modules.h" | |
41 | ||
42 | static const char server_desc[] = | |
43 | "Provides the TS6 commands to introduce a new server to the network"; | |
44 | ||
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 **); | |
48 | ||
49 | static bool bogus_host(const char *host); | |
50 | static void set_server_gecos(struct Client *, const char *); | |
51 | ||
52 | struct Message server_msgtab = { | |
53 | "SERVER", 0, 0, 0, 0, | |
54 | {{mr_server, 4}, mg_reg, mg_ignore, {ms_server, 4}, mg_ignore, mg_reg} | |
55 | }; | |
56 | struct Message sid_msgtab = { | |
57 | "SID", 0, 0, 0, 0, | |
58 | {mg_ignore, mg_reg, mg_ignore, {ms_sid, 5}, mg_ignore, mg_reg} | |
59 | }; | |
60 | ||
61 | mapi_clist_av1 server_clist[] = { &server_msgtab, &sid_msgtab, NULL }; | |
62 | ||
63 | DECLARE_MODULE_AV2(server, NULL, NULL, server_clist, NULL, NULL, NULL, NULL, server_desc); | |
64 | ||
65 | /* | |
66 | * mr_server - SERVER message handler | |
67 | * parv[1] = servername | |
68 | * parv[2] = serverinfo/hopcount | |
69 | * parv[3] = serverinfo | |
70 | */ | |
71 | static void | |
72 | mr_server(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
73 | { | |
74 | char info[REALLEN + 1]; | |
75 | const char *name; | |
76 | struct Client *target_p; | |
77 | int hop; | |
78 | unsigned int required_mask; | |
79 | const char *missing; | |
80 | int ret; | |
81 | ||
82 | name = parv[1]; | |
83 | hop = atoi(parv[2]); | |
84 | rb_strlcpy(info, parv[3], sizeof(info)); | |
85 | ||
86 | if (IsHandshake(client_p) && irccmp(client_p->name, name)) | |
87 | { | |
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"); | |
94 | return; | |
95 | } | |
96 | ||
97 | /* | |
98 | * Reject a direct nonTS server connection if we're TS_ONLY -orabidoo | |
99 | */ | |
100 | if(!DoesTS(client_p)) | |
101 | { | |
102 | sendto_realops_snomask(SNO_GENERAL, L_ALL, "Link %s dropped, non-TS server", | |
103 | client_p->name); | |
104 | exit_client(client_p, client_p, client_p, "Non-TS server"); | |
105 | return; | |
106 | } | |
107 | ||
108 | if(bogus_host(name)) | |
109 | { | |
110 | exit_client(client_p, client_p, client_p, "Bogus server name"); | |
111 | return; | |
112 | } | |
113 | ||
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); | |
117 | switch (ret) | |
118 | { | |
119 | case 0: | |
120 | /* success */ | |
121 | break; | |
122 | case -1: | |
123 | if(ConfigFileEntry.warn_no_nline) | |
124 | { | |
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); | |
129 | ||
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)); | |
133 | } | |
134 | ||
135 | exit_client(client_p, client_p, client_p, "Invalid servername."); | |
136 | return; | |
137 | /* NOT REACHED */ | |
138 | break; | |
139 | ||
140 | case -2: | |
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); | |
145 | ||
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)); | |
149 | ||
150 | exit_client(client_p, client_p, client_p, "Invalid credentials."); | |
151 | return; | |
152 | /* NOT REACHED */ | |
153 | break; | |
154 | ||
155 | case -3: | |
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); | |
160 | ||
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)); | |
164 | ||
165 | exit_client(client_p, client_p, client_p, "Invalid host."); | |
166 | return; | |
167 | /* NOT REACHED */ | |
168 | break; | |
169 | ||
170 | /* servername is > HOSTLEN */ | |
171 | case -4: | |
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)); | |
177 | ||
178 | exit_client(client_p, client_p, client_p, "Invalid servername."); | |
179 | return; | |
180 | /* NOT REACHED */ | |
181 | break; | |
182 | case -5: | |
183 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
184 | "Connection from servername %s requires SSL/TLS but is plaintext", | |
185 | name); | |
186 | ilog(L_SERVER, "Access denied, requires SSL/TLS but is plaintext from %s", | |
187 | log_client_name(client_p, SHOW_IP)); | |
188 | ||
189 | exit_client(client_p, client_p, client_p, "Access denied, requires SSL/TLS but is plaintext"); | |
190 | return; | |
191 | case -6: | |
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)); | |
197 | ||
198 | exit_client(client_p, client_p, client_p, "Invalid fingerprint."); | |
199 | return; | |
200 | default: | |
201 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
202 | "Connection from servername %s rejected, unknown error %d", | |
203 | name, ret); | |
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)); | |
207 | ||
208 | exit_client(client_p, client_p, client_p, "Unknown error."); | |
209 | return; | |
210 | } | |
211 | ||
212 | /* require TS6 for direct links */ | |
213 | if(!IsCapable(client_p, CAP_TS6)) | |
214 | { | |
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"); | |
218 | return; | |
219 | } | |
220 | ||
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)) | |
224 | { | |
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", | |
229 | name, 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 | |
235 | * addresses) | |
236 | */ | |
237 | sendto_one(client_p, "ERROR :Missing required CAPABs (%s)", missing); | |
238 | exit_client(client_p, client_p, client_p, "Missing required CAPABs"); | |
239 | ||
240 | return; | |
241 | } | |
242 | ||
243 | if((target_p = find_server(NULL, name))) | |
244 | { | |
245 | /* | |
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!! | |
249 | * | |
250 | * Rather than KILL the link which introduced it, KILL the | |
251 | * youngest of the two links. -avalon | |
252 | * | |
253 | * Definitely don't do that here. This is from an unregistered | |
254 | * connect - A1kmm. | |
255 | */ | |
256 | if (target_p->servptr->flags & FLAGS_SERVICE) | |
257 | { | |
258 | /* Assume any servers introduced by services | |
259 | * are jupes. | |
260 | * -- jilles | |
261 | */ | |
262 | sendto_one(client_p, "ERROR :Server juped."); | |
263 | } | |
264 | else | |
265 | { | |
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)); | |
271 | ||
272 | sendto_one(client_p, "ERROR :Server already exists."); | |
273 | } | |
274 | exit_client(client_p, client_p, client_p, "Server Exists"); | |
275 | return; | |
276 | } | |
277 | ||
278 | if(has_id(client_p) && (target_p = find_id(client_p->id)) != NULL) | |
279 | { | |
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)", | |
282 | client_p->id, | |
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)", | |
286 | client_p->id, | |
287 | EmptyString(client_p->name) ? name : "", | |
288 | log_client_name(client_p, SHOW_IP), | |
289 | target_p->name); | |
290 | ||
291 | sendto_one(client_p, "ERROR :SID already exists."); | |
292 | exit_client(client_p, client_p, client_p, "SID Exists"); | |
293 | return; | |
294 | } | |
295 | ||
296 | /* | |
297 | * if we are connecting (Handshake), we already have the name from the | |
298 | * C:line in client_p->name | |
299 | */ | |
300 | ||
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); | |
305 | } | |
306 | ||
307 | /* | |
308 | * ms_server - SERVER message handler | |
309 | * parv[1] = servername | |
310 | * parv[2] = serverinfo/hopcount | |
311 | * parv[3] = serverinfo | |
312 | */ | |
313 | static void | |
314 | ms_server(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
315 | { | |
316 | char info[REALLEN + 1]; | |
317 | /* same size as in s_misc.c */ | |
318 | const char *name; | |
319 | struct Client *target_p; | |
320 | struct remote_conf *hub_p; | |
321 | hook_data_client hdata; | |
322 | int hop; | |
323 | int hlined = 0; | |
324 | int llined = 0; | |
325 | rb_dlink_node *ptr; | |
326 | char squitreason[160]; | |
327 | ||
328 | name = parv[1]; | |
329 | hop = atoi(parv[2]); | |
330 | rb_strlcpy(info, parv[3], sizeof(info)); | |
331 | ||
332 | if(find_server(NULL, name)) | |
333 | { | |
334 | /* | |
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!! | |
338 | * | |
339 | * Rather than KILL the link which introduced it, KILL the | |
340 | * youngest of the two links. -avalon | |
341 | * | |
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 | |
345 | * | |
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 | |
350 | * solution.. --fl_ | |
351 | */ | |
352 | ilog(L_SERVER, "Link %s cancelled, server %s already exists", | |
353 | client_p->name, name); | |
354 | ||
355 | snprintf(squitreason, sizeof squitreason, | |
356 | "Server %s already exists", | |
357 | name); | |
358 | exit_client(client_p, client_p, &me, squitreason); | |
359 | return; | |
360 | } | |
361 | ||
362 | /* | |
363 | * User nicks never have '.' in them and server names | |
364 | * must always have '.' in them. | |
365 | */ | |
366 | if(strchr(name, '.') == NULL) | |
367 | { | |
368 | /* | |
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. | |
372 | */ | |
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); | |
379 | ||
380 | exit_client(client_p, client_p, client_p, "Nick as Server"); | |
381 | return; | |
382 | } | |
383 | ||
384 | /* | |
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 | |
388 | * server links... | |
389 | */ | |
390 | ||
391 | /* | |
392 | * See if the newly found server is behind a guaranteed | |
393 | * leaf. If so, close the link. | |
394 | * | |
395 | */ | |
396 | RB_DLINK_FOREACH(ptr, hubleaf_conf_list.head) | |
397 | { | |
398 | hub_p = ptr->data; | |
399 | ||
400 | if(match(hub_p->server, client_p->name) && match(hub_p->host, name)) | |
401 | { | |
402 | if(hub_p->flags & CONF_HUB) | |
403 | hlined++; | |
404 | else | |
405 | llined++; | |
406 | } | |
407 | } | |
408 | ||
409 | /* Ok, this way this works is | |
410 | * | |
411 | * A server can have a CONF_HUB allowing it to introduce servers | |
412 | * behind it. | |
413 | * | |
414 | * connect { | |
415 | * name = "irc.bighub.net"; | |
416 | * hub_mask="*"; | |
417 | * ... | |
418 | * | |
419 | * That would allow "irc.bighub.net" to introduce anything it wanted.. | |
420 | * | |
421 | * However | |
422 | * | |
423 | * connect { | |
424 | * name = "irc.somehub.fi"; | |
425 | * hub_mask="*"; | |
426 | * leaf_mask="*.edu"; | |
427 | *... | |
428 | * Would allow this server in finland to hub anything but | |
429 | * .edu's | |
430 | */ | |
431 | ||
432 | /* Ok, check client_p can hub the new server */ | |
433 | if(!hlined) | |
434 | { | |
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); | |
440 | ||
441 | snprintf(squitreason, sizeof squitreason, | |
442 | "No matching hub_mask for %s", | |
443 | name); | |
444 | exit_client(NULL, client_p, &me, squitreason); | |
445 | return; | |
446 | } | |
447 | ||
448 | /* Check for the new server being leafed behind this HUB */ | |
449 | if(llined) | |
450 | { | |
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); | |
457 | ||
458 | snprintf(squitreason, sizeof squitreason, | |
459 | "Matching leaf_mask for %s", | |
460 | name); | |
461 | exit_client(NULL, client_p, &me, squitreason); | |
462 | return; | |
463 | } | |
464 | ||
465 | ||
466 | ||
467 | if(strlen(name) > HOSTLEN) | |
468 | { | |
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); | |
474 | ||
475 | exit_client(NULL, client_p, &me, "Invalid servername introduced."); | |
476 | return; | |
477 | } | |
478 | ||
479 | target_p = make_client(client_p); | |
480 | make_server(target_p); | |
481 | target_p->hopcount = hop; | |
482 | ||
483 | rb_strlcpy(target_p->name, name, sizeof(target_p->name)); | |
484 | ||
485 | set_server_gecos(target_p, info); | |
486 | ||
487 | target_p->servptr = source_p; | |
488 | ||
489 | SetServer(target_p); | |
490 | ||
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); | |
495 | ||
496 | target_p->serv->nameinfo = scache_connect(target_p->name, target_p->info, IsHidden(target_p)); | |
497 | ||
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); | |
502 | ||
503 | sendto_realops_snomask(SNO_EXTERNAL, L_ALL, | |
504 | "Server %s being introduced by %s", target_p->name, source_p->name); | |
505 | ||
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); | |
508 | ||
509 | hdata.client = source_p; | |
510 | hdata.target = target_p; | |
511 | call_hook(h_server_introduced, &hdata); | |
512 | } | |
513 | ||
514 | static void | |
515 | ms_sid(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[]) | |
516 | { | |
517 | struct Client *target_p; | |
518 | struct remote_conf *hub_p; | |
519 | hook_data_client hdata; | |
520 | rb_dlink_node *ptr; | |
521 | int hlined = 0; | |
522 | int llined = 0; | |
523 | char squitreason[160]; | |
524 | ||
525 | /* collision on the name? */ | |
526 | if(find_server(NULL, parv[1]) != NULL) | |
527 | { | |
528 | ilog(L_SERVER, "Link %s cancelled, server %s already exists", | |
529 | client_p->name, parv[1]); | |
530 | ||
531 | snprintf(squitreason, sizeof squitreason, | |
532 | "Server %s already exists", | |
533 | parv[1]); | |
534 | exit_client(NULL, client_p, &me, squitreason); | |
535 | return; | |
536 | } | |
537 | ||
538 | /* collision on the SID? */ | |
539 | if((target_p = find_id(parv[3])) != NULL) | |
540 | { | |
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); | |
549 | ||
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); | |
554 | return; | |
555 | } | |
556 | ||
557 | if(bogus_host(parv[1]) || strlen(parv[1]) > HOSTLEN) | |
558 | { | |
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]); | |
565 | ||
566 | exit_client(NULL, client_p, &me, "Bogus server name"); | |
567 | return; | |
568 | } | |
569 | ||
570 | if(!IsDigit(parv[3][0]) || !IsIdChar(parv[3][1]) || | |
571 | !IsIdChar(parv[3][2]) || parv[3][3] != '\0') | |
572 | { | |
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]); | |
579 | ||
580 | exit_client(NULL, client_p, &me, "Bogus SID"); | |
581 | return; | |
582 | } | |
583 | ||
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 | |
587 | */ | |
588 | RB_DLINK_FOREACH(ptr, hubleaf_conf_list.head) | |
589 | { | |
590 | hub_p = ptr->data; | |
591 | ||
592 | if(match(hub_p->server, client_p->name) && match(hub_p->host, parv[1])) | |
593 | { | |
594 | if(hub_p->flags & CONF_HUB) | |
595 | hlined++; | |
596 | else | |
597 | llined++; | |
598 | } | |
599 | } | |
600 | ||
601 | /* no matching hub_mask */ | |
602 | if(!hlined) | |
603 | { | |
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]); | |
609 | ||
610 | snprintf(squitreason, sizeof squitreason, | |
611 | "No matching hub_mask for %s", | |
612 | parv[1]); | |
613 | exit_client(NULL, client_p, &me, squitreason); | |
614 | return; | |
615 | } | |
616 | ||
617 | /* matching leaf_mask */ | |
618 | if(llined) | |
619 | { | |
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]); | |
625 | ||
626 | snprintf(squitreason, sizeof squitreason, | |
627 | "Matching leaf_mask for %s", | |
628 | parv[1]); | |
629 | exit_client(NULL, client_p, &me, squitreason); | |
630 | return; | |
631 | } | |
632 | ||
633 | /* ok, alls good */ | |
634 | target_p = make_client(client_p); | |
635 | make_server(target_p); | |
636 | ||
637 | rb_strlcpy(target_p->name, parv[1], sizeof(target_p->name)); | |
638 | target_p->hopcount = atoi(parv[2]); | |
639 | rb_strlcpy(target_p->id, parv[3], sizeof(target_p->id)); | |
640 | set_server_gecos(target_p, parv[4]); | |
641 | ||
642 | target_p->servptr = source_p; | |
643 | SetServer(target_p); | |
644 | ||
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); | |
650 | ||
651 | target_p->serv->nameinfo = scache_connect(target_p->name, target_p->info, IsHidden(target_p)); | |
652 | ||
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); | |
657 | ||
658 | sendto_realops_snomask(SNO_EXTERNAL, L_ALL, | |
659 | "Server %s being introduced by %s", target_p->name, source_p->name); | |
660 | ||
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)); | |
664 | ||
665 | hdata.client = source_p; | |
666 | hdata.target = target_p; | |
667 | call_hook(h_server_introduced, &hdata); | |
668 | } | |
669 | ||
670 | /* set_server_gecos() | |
671 | * | |
672 | * input - pointer to client | |
673 | * output - none | |
674 | * side effects - servers gecos field is set | |
675 | */ | |
676 | static void | |
677 | set_server_gecos(struct Client *client_p, const char *info) | |
678 | { | |
679 | /* check the info for [IP] */ | |
680 | if(info[0]) | |
681 | { | |
682 | char *p; | |
683 | char *s; | |
684 | ||
685 | s = LOCAL_COPY(info); | |
686 | ||
687 | /* we should only check the first word for an ip */ | |
688 | if((p = strchr(s, ' '))) | |
689 | *p = '\0'; | |
690 | ||
691 | /* check for a ] which would symbolise an [IP] */ | |
692 | if(strchr(s, ']')) | |
693 | { | |
694 | /* set s to after the first space */ | |
695 | if(p) | |
696 | s = ++p; | |
697 | else | |
698 | s = NULL; | |
699 | } | |
700 | /* no ], put the space back */ | |
701 | else if(p) | |
702 | *p = ' '; | |
703 | ||
704 | /* p may have been set to a trailing space, so check s exists and that | |
705 | * it isnt \0 */ | |
706 | if(s && (*s != '\0')) | |
707 | { | |
708 | /* a space? if not (H) could be the last part of info.. */ | |
709 | if((p = strchr(s, ' '))) | |
710 | *p = '\0'; | |
711 | ||
712 | /* check for (H) which is a hidden server */ | |
713 | if(!strcmp(s, "(H)")) | |
714 | { | |
715 | SetHidden(client_p); | |
716 | ||
717 | /* if there was no space.. theres nothing to set info to */ | |
718 | if(p) | |
719 | s = ++p; | |
720 | else | |
721 | s = NULL; | |
722 | } | |
723 | else if(p) | |
724 | *p = ' '; | |
725 | ||
726 | /* if there was a trailing space, s could point to \0, so check */ | |
727 | if(s && (*s != '\0')) | |
728 | { | |
729 | rb_strlcpy(client_p->info, s, sizeof(client_p->info)); | |
730 | return; | |
731 | } | |
732 | } | |
733 | } | |
734 | ||
735 | rb_strlcpy(client_p->info, "(Unknown Location)", sizeof(client_p->info)); | |
736 | } | |
737 | ||
738 | /* | |
739 | * bogus_host | |
740 | * | |
741 | * inputs - hostname | |
742 | * output - true if a bogus hostname input, false if its valid | |
743 | * side effects - none | |
744 | */ | |
745 | static bool | |
746 | bogus_host(const char *host) | |
747 | { | |
748 | bool bogus_server = false; | |
749 | const char *s; | |
750 | int dots = 0; | |
751 | ||
752 | for(s = host; *s; s++) | |
753 | { | |
754 | if(!IsServChar(*s)) | |
755 | { | |
756 | bogus_server = true; | |
757 | break; | |
758 | } | |
759 | if('.' == *s) | |
760 | ++dots; | |
761 | } | |
762 | ||
763 | if(!dots || bogus_server) | |
764 | return true; | |
765 | ||
766 | return false; | |
767 | } |