| 1 |
/* |
| 2 |
* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd) |
| 3 |
* |
| 4 |
* Copyright (c) 1997-2014 ircd-hybrid development team |
| 5 |
* |
| 6 |
* This program is free software; you can redistribute it and/or modify |
| 7 |
* it under the terms of the GNU General Public License as published by |
| 8 |
* the Free Software Foundation; either version 2 of the License, or |
| 9 |
* (at your option) any later version. |
| 10 |
* |
| 11 |
* This program is distributed in the hope that it will be useful, |
| 12 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 |
* GNU General Public License for more details. |
| 15 |
* |
| 16 |
* You should have received a copy of the GNU General Public License |
| 17 |
* along with this program; if not, write to the Free Software |
| 18 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 |
| 19 |
* USA |
| 20 |
*/ |
| 21 |
|
| 22 |
/*! \file m_server.c |
| 23 |
* \brief Includes required functions for processing the SERVER/SID command. |
| 24 |
* \version $Id$ |
| 25 |
*/ |
| 26 |
|
| 27 |
#include "stdinc.h" |
| 28 |
#include "list.h" |
| 29 |
#include "client.h" |
| 30 |
#include "event.h" |
| 31 |
#include "hash.h" |
| 32 |
#include "irc_string.h" |
| 33 |
#include "ircd.h" |
| 34 |
#include "numeric.h" |
| 35 |
#include "conf.h" |
| 36 |
#include "log.h" |
| 37 |
#include "s_serv.h" |
| 38 |
#include "s_user.h" |
| 39 |
#include "send.h" |
| 40 |
#include "parse.h" |
| 41 |
#include "modules.h" |
| 42 |
|
| 43 |
|
| 44 |
/* set_server_gecos() |
| 45 |
* |
| 46 |
* input - pointer to client |
| 47 |
* output - NONE |
| 48 |
* side effects - servers gecos field is set |
| 49 |
*/ |
| 50 |
static void |
| 51 |
set_server_gecos(struct Client *client_p, const char *info) |
| 52 |
{ |
| 53 |
const char *s = info; |
| 54 |
|
| 55 |
/* check for (H) which is a hidden server */ |
| 56 |
if (!strncmp(s, "(H) ", 4)) |
| 57 |
{ |
| 58 |
SetHidden(client_p); |
| 59 |
s = s + 4; |
| 60 |
} |
| 61 |
|
| 62 |
if (!EmptyString(s)) |
| 63 |
strlcpy(client_p->info, s, sizeof(client_p->info)); |
| 64 |
else |
| 65 |
strlcpy(client_p->info, "(Unknown Location)", sizeof(client_p->info)); |
| 66 |
} |
| 67 |
|
| 68 |
/* mr_server() |
| 69 |
* parv[0] = command |
| 70 |
* parv[1] = servername |
| 71 |
* parv[2] = hopcount |
| 72 |
* parv[3] = serverinfo |
| 73 |
*/ |
| 74 |
static int |
| 75 |
mr_server(struct Client *source_p, int parc, char *parv[]) |
| 76 |
{ |
| 77 |
char *name; |
| 78 |
struct Client *target_p; |
| 79 |
int hop; |
| 80 |
|
| 81 |
if (EmptyString(parv[3])) |
| 82 |
{ |
| 83 |
sendto_one(source_p, "ERROR :No servername"); |
| 84 |
exit_client(source_p, source_p, "Wrong number of args"); |
| 85 |
return 0; |
| 86 |
} |
| 87 |
|
| 88 |
name = parv[1]; |
| 89 |
hop = atoi(parv[2]); |
| 90 |
|
| 91 |
/* |
| 92 |
* Reject a direct nonTS server connection if we're TS_ONLY -orabidoo |
| 93 |
*/ |
| 94 |
if (!DoesTS(source_p)) |
| 95 |
{ |
| 96 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 97 |
"Unauthorized server connection attempt from %s: Non-TS server " |
| 98 |
"for server %s", get_client_name(source_p, HIDE_IP), name); |
| 99 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 100 |
"Unauthorized server connection attempt from %s: Non-TS server " |
| 101 |
"for server %s", get_client_name(source_p, MASK_IP), name); |
| 102 |
exit_client(source_p, source_p, "Non-TS server"); |
| 103 |
return 0; |
| 104 |
} |
| 105 |
|
| 106 |
if (!valid_servname(name)) |
| 107 |
{ |
| 108 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 109 |
"Unauthorized server connection attempt from %s: Bogus server name " |
| 110 |
"for server %s", get_client_name(source_p, HIDE_IP), name); |
| 111 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 112 |
"Unauthorized server connection attempt from %s: Bogus server name " |
| 113 |
"for server %s", get_client_name(source_p, MASK_IP), name); |
| 114 |
exit_client(source_p, source_p, "Bogus server name"); |
| 115 |
return 0; |
| 116 |
} |
| 117 |
|
| 118 |
if (!valid_sid(source_p->id)) |
| 119 |
{ |
| 120 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 121 |
"Link %s introduced server with bogus server ID %s", |
| 122 |
get_client_name(source_p, SHOW_IP), source_p->id); |
| 123 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 124 |
"Link %s introduced server with bogus server ID %s", |
| 125 |
get_client_name(source_p, MASK_IP), source_p->id); |
| 126 |
sendto_one(source_p, "ERROR :Bogus server ID introduced"); |
| 127 |
exit_client(source_p, &me, "Bogus server ID intoduced"); |
| 128 |
return 0; |
| 129 |
} |
| 130 |
|
| 131 |
/* Now we just have to call check_server and everything should |
| 132 |
* be check for us... -A1kmm. |
| 133 |
*/ |
| 134 |
switch (check_server(name, source_p)) |
| 135 |
{ |
| 136 |
case -1: |
| 137 |
if (ConfigFileEntry.warn_no_nline) |
| 138 |
{ |
| 139 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 140 |
"Unauthorized server connection attempt from %s: No entry for " |
| 141 |
"servername %s", get_client_name(source_p, HIDE_IP), name); |
| 142 |
|
| 143 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 144 |
"Unauthorized server connection attempt from %s: No entry for " |
| 145 |
"servername %s", get_client_name(source_p, MASK_IP), name); |
| 146 |
} |
| 147 |
|
| 148 |
exit_client(source_p, source_p, "No connect{} block."); |
| 149 |
return 0; |
| 150 |
/* NOT REACHED */ |
| 151 |
break; |
| 152 |
|
| 153 |
case -2: |
| 154 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 155 |
"Unauthorized server connection attempt from %s: Bad password " |
| 156 |
"for server %s", get_client_name(source_p, HIDE_IP), name); |
| 157 |
|
| 158 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 159 |
"Unauthorized server connection attempt from %s: Bad password " |
| 160 |
"for server %s", get_client_name(source_p, MASK_IP), name); |
| 161 |
|
| 162 |
exit_client(source_p, source_p, "Invalid password."); |
| 163 |
return 0; |
| 164 |
/* NOT REACHED */ |
| 165 |
break; |
| 166 |
|
| 167 |
case -3: |
| 168 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 169 |
"Unauthorized server connection attempt from %s: Invalid host " |
| 170 |
"for server %s", get_client_name(source_p, HIDE_IP), name); |
| 171 |
|
| 172 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 173 |
"Unauthorized server connection attempt from %s: Invalid host " |
| 174 |
"for server %s", get_client_name(source_p, MASK_IP), name); |
| 175 |
|
| 176 |
exit_client(source_p, source_p, "Invalid host."); |
| 177 |
return 0; |
| 178 |
case -4: |
| 179 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 180 |
"Unauthorized server connection attempt from %s: Invalid certificate fingerprint " |
| 181 |
"for server %s", get_client_name(source_p, HIDE_IP), name); |
| 182 |
|
| 183 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 184 |
"Unauthorized server connection attempt from %s: Invalid certificate fingerprint " |
| 185 |
"for server %s", get_client_name(source_p, MASK_IP), name); |
| 186 |
|
| 187 |
exit_client(source_p, source_p, "Invalid certificate fingerprint."); |
| 188 |
return 0; |
| 189 |
/* NOT REACHED */ |
| 190 |
break; |
| 191 |
} |
| 192 |
|
| 193 |
if ((target_p = hash_find_server(name))) |
| 194 |
{ |
| 195 |
/* This link is trying feed me a server that I already have |
| 196 |
* access through another path -- multiple paths not accepted |
| 197 |
* currently, kill this link immediately!! |
| 198 |
* |
| 199 |
* Rather than KILL the link which introduced it, KILL the |
| 200 |
* youngest of the two links. -avalon |
| 201 |
* |
| 202 |
* Definitely don't do that here. This is from an unregistered |
| 203 |
* connect - A1kmm. |
| 204 |
*/ |
| 205 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 206 |
"Attempt to re-introduce server %s from %s", |
| 207 |
name, get_client_name(source_p, HIDE_IP)); |
| 208 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 209 |
"Attempt to re-introduce server %s from %s", |
| 210 |
name, get_client_name(source_p, MASK_IP)); |
| 211 |
sendto_one(source_p, "ERROR :Server already exists."); |
| 212 |
exit_client(source_p, source_p, "Server already exists"); |
| 213 |
return 0; |
| 214 |
} |
| 215 |
|
| 216 |
if ((target_p = hash_find_id(source_p->id))) |
| 217 |
{ |
| 218 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 219 |
"Attempt to re-introduce server %s SID %s from %s", |
| 220 |
name, source_p->id, |
| 221 |
get_client_name(source_p, HIDE_IP)); |
| 222 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 223 |
"Attempt to re-introduce server %s SID %s from %s", |
| 224 |
name, source_p->id, |
| 225 |
get_client_name(source_p, MASK_IP)); |
| 226 |
sendto_one(source_p, "ERROR :Server ID already exists."); |
| 227 |
exit_client(source_p, source_p, "Server ID already exists"); |
| 228 |
return 0; |
| 229 |
} |
| 230 |
|
| 231 |
/* XXX If somehow there is a connect in progress and |
| 232 |
* a connect comes in with same name toss the pending one, |
| 233 |
* but only if it's not the same client! - Dianora |
| 234 |
*/ |
| 235 |
if ((target_p = find_servconn_in_progress(name))) |
| 236 |
if (target_p != source_p) |
| 237 |
exit_client(target_p, &me, "Overridden"); |
| 238 |
|
| 239 |
/* if we are connecting (Handshake), we already have the name from the |
| 240 |
* connect{} block in source_p->name |
| 241 |
*/ |
| 242 |
strlcpy(source_p->name, name, sizeof(source_p->name)); |
| 243 |
set_server_gecos(source_p, parv[3]); |
| 244 |
source_p->hopcount = hop; |
| 245 |
server_estab(source_p); |
| 246 |
return 0; |
| 247 |
} |
| 248 |
|
| 249 |
/* ms_sid() |
| 250 |
* parv[0] = command |
| 251 |
* parv[1] = servername |
| 252 |
* parv[2] = hopcount |
| 253 |
* parv[3] = sid of new server |
| 254 |
* parv[4] = serverinfo |
| 255 |
*/ |
| 256 |
static int |
| 257 |
ms_sid(struct Client *source_p, int parc, char *parv[]) |
| 258 |
{ |
| 259 |
dlink_node *ptr = NULL; |
| 260 |
struct Client *target_p = NULL; |
| 261 |
struct Client *client_p = source_p->from; /* XXX */ |
| 262 |
const struct MaskItem *conf = NULL; |
| 263 |
int hlined = 0; |
| 264 |
int llined = 0; |
| 265 |
int hop = 0; |
| 266 |
|
| 267 |
/* Just to be sure -A1kmm. */ |
| 268 |
if (!IsServer(source_p)) |
| 269 |
return 0; |
| 270 |
|
| 271 |
if (EmptyString(parv[4])) |
| 272 |
{ |
| 273 |
sendto_one(client_p, "ERROR :No servername"); |
| 274 |
return 0; |
| 275 |
} |
| 276 |
|
| 277 |
hop = atoi(parv[2]); |
| 278 |
|
| 279 |
if (!valid_servname(parv[1])) |
| 280 |
{ |
| 281 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 282 |
"Link %s introduced server with bogus server name %s", |
| 283 |
get_client_name(client_p, SHOW_IP), parv[1]); |
| 284 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 285 |
"Link %s introduced server with bogus server name %s", |
| 286 |
get_client_name(client_p, MASK_IP), parv[1]); |
| 287 |
sendto_one(client_p, "ERROR :Bogus server name introduced"); |
| 288 |
exit_client(client_p, &me, "Bogus server name intoduced"); |
| 289 |
return 0; |
| 290 |
} |
| 291 |
|
| 292 |
if (!valid_sid(parv[3])) |
| 293 |
{ |
| 294 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 295 |
"Link %s introduced server with bogus server ID %s", |
| 296 |
get_client_name(client_p, SHOW_IP), parv[3]); |
| 297 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 298 |
"Link %s introduced server with bogus server ID %s", |
| 299 |
get_client_name(client_p, MASK_IP), parv[3]); |
| 300 |
sendto_one(client_p, "ERROR :Bogus server ID introduced"); |
| 301 |
exit_client(client_p, &me, "Bogus server ID intoduced"); |
| 302 |
return 0; |
| 303 |
} |
| 304 |
|
| 305 |
/* collision on SID? */ |
| 306 |
if ((target_p = hash_find_id(parv[3]))) |
| 307 |
{ |
| 308 |
sendto_one(client_p, "ERROR :SID %s already exists", parv[3]); |
| 309 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 310 |
"Link %s cancelled, SID %s already exists", |
| 311 |
get_client_name(client_p, SHOW_IP), parv[3]); |
| 312 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 313 |
"Link %s cancelled, SID %s already exists", |
| 314 |
client_p->name, parv[3]); |
| 315 |
exit_client(client_p, &me, "SID Exists"); |
| 316 |
return 0; |
| 317 |
} |
| 318 |
|
| 319 |
/* collision on name? */ |
| 320 |
if ((target_p = hash_find_server(parv[1]))) |
| 321 |
{ |
| 322 |
sendto_one(client_p, "ERROR :Server %s already exists", parv[1]); |
| 323 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 324 |
"Link %s cancelled, server %s already exists", |
| 325 |
get_client_name(client_p, SHOW_IP), parv[1]); |
| 326 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 327 |
"Link %s cancelled, server %s already exists", |
| 328 |
client_p->name, parv[1]); |
| 329 |
exit_client(client_p, &me, "Server Exists"); |
| 330 |
return 0; |
| 331 |
} |
| 332 |
|
| 333 |
/* XXX If somehow there is a connect in progress and |
| 334 |
* a connect comes in with same name toss the pending one, |
| 335 |
* but only if it's not the same client! - Dianora |
| 336 |
*/ |
| 337 |
if ((target_p = find_servconn_in_progress(parv[1]))) |
| 338 |
if (target_p != client_p) |
| 339 |
exit_client(target_p, &me, "Overridden"); |
| 340 |
|
| 341 |
conf = client_p->localClient->confs.head->data; |
| 342 |
|
| 343 |
/* See if the newly found server is behind a guaranteed |
| 344 |
* leaf. If so, close the link. |
| 345 |
*/ |
| 346 |
DLINK_FOREACH(ptr, conf->leaf_list.head) |
| 347 |
{ |
| 348 |
if (!match(ptr->data, parv[1])) |
| 349 |
{ |
| 350 |
llined = 1; |
| 351 |
break; |
| 352 |
} |
| 353 |
} |
| 354 |
|
| 355 |
DLINK_FOREACH(ptr, conf->hub_list.head) |
| 356 |
{ |
| 357 |
if (!match(ptr->data, parv[1])) |
| 358 |
{ |
| 359 |
hlined = 1; |
| 360 |
break; |
| 361 |
} |
| 362 |
} |
| 363 |
|
| 364 |
/* Ok, this way this works is |
| 365 |
* |
| 366 |
* A server can have a CONF_HUB allowing it to introduce servers |
| 367 |
* behind it. |
| 368 |
* |
| 369 |
* connect { |
| 370 |
* name = "irc.bighub.net"; |
| 371 |
* hub_mask="*"; |
| 372 |
* ... |
| 373 |
* |
| 374 |
* That would allow "irc.bighub.net" to introduce anything it wanted.. |
| 375 |
* |
| 376 |
* However |
| 377 |
* |
| 378 |
* connect { |
| 379 |
* name = "irc.somehub.fi"; |
| 380 |
* hub_mask="*"; |
| 381 |
* leaf_mask="*.edu"; |
| 382 |
*... |
| 383 |
* Would allow this server in finland to hub anything but |
| 384 |
* .edu's |
| 385 |
*/ |
| 386 |
|
| 387 |
/* Ok, check client_p can hub the new server, and make sure it's not a LL */ |
| 388 |
if (!hlined) |
| 389 |
{ |
| 390 |
/* OOOPs nope can't HUB */ |
| 391 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 392 |
"Non-Hub link %s introduced %s.", |
| 393 |
get_client_name(client_p, SHOW_IP), parv[1]); |
| 394 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 395 |
"Non-Hub link %s introduced %s.", |
| 396 |
get_client_name(client_p, MASK_IP), parv[1]); |
| 397 |
exit_client(source_p, &me, "No matching hub_mask."); |
| 398 |
return 0; |
| 399 |
} |
| 400 |
|
| 401 |
/* Check for the new server being leafed behind this HUB */ |
| 402 |
if (llined) |
| 403 |
{ |
| 404 |
/* OOOPs nope can't HUB this leaf */ |
| 405 |
sendto_realops_flags(UMODE_ALL, L_ADMIN, SEND_NOTICE, |
| 406 |
"Link %s introduced leafed server %s.", |
| 407 |
get_client_name(client_p, SHOW_IP), parv[1]); |
| 408 |
sendto_realops_flags(UMODE_ALL, L_OPER, SEND_NOTICE, |
| 409 |
"Link %s introduced leafed server %s.", |
| 410 |
get_client_name(client_p, MASK_IP), parv[1]); |
| 411 |
exit_client(client_p, &me, "Leafed Server."); |
| 412 |
return 0; |
| 413 |
} |
| 414 |
|
| 415 |
target_p = make_client(client_p); |
| 416 |
make_server(target_p); |
| 417 |
target_p->hopcount = hop; |
| 418 |
target_p->servptr = source_p; |
| 419 |
|
| 420 |
strlcpy(target_p->name, parv[1], sizeof(target_p->name)); |
| 421 |
strlcpy(target_p->id, parv[3], sizeof(target_p->id)); |
| 422 |
|
| 423 |
set_server_gecos(target_p, parv[4]); |
| 424 |
SetServer(target_p); |
| 425 |
|
| 426 |
if (HasFlag(source_p, FLAGS_SERVICE) || find_matching_name_conf(CONF_SERVICE, target_p->name, NULL, NULL, 0)) |
| 427 |
AddFlag(target_p, FLAGS_SERVICE); |
| 428 |
|
| 429 |
dlinkAdd(target_p, &target_p->node, &global_client_list); |
| 430 |
dlinkAdd(target_p, make_dlink_node(), &global_serv_list); |
| 431 |
dlinkAdd(target_p, &target_p->lnode, &target_p->servptr->serv->server_list); |
| 432 |
|
| 433 |
hash_add_client(target_p); |
| 434 |
hash_add_id(target_p); |
| 435 |
|
| 436 |
sendto_server(client_p, NOCAPS, NOCAPS, ":%s SID %s %d %s :%s%s", |
| 437 |
ID_or_name(source_p, client_p), target_p->name, hop + 1, |
| 438 |
target_p->id, IsHidden(target_p) ? "(H) " : "", target_p->info); |
| 439 |
sendto_realops_flags(UMODE_EXTERNAL, L_ALL, SEND_NOTICE, |
| 440 |
"Server %s being introduced by %s", |
| 441 |
target_p->name, source_p->name); |
| 442 |
return 0; |
| 443 |
} |
| 444 |
|
| 445 |
static struct Message server_msgtab = |
| 446 |
{ |
| 447 |
"SERVER", 0, 0, 4, MAXPARA, MFLG_SLOW, 0, |
| 448 |
{ mr_server, m_registered, m_ignore, m_ignore, m_registered, m_ignore } |
| 449 |
}; |
| 450 |
|
| 451 |
static struct Message sid_msgtab = |
| 452 |
{ |
| 453 |
"SID", 0, 0, 5, MAXPARA, MFLG_SLOW, 0, |
| 454 |
{ m_ignore, m_ignore, ms_sid, m_ignore, m_ignore, m_ignore } |
| 455 |
}; |
| 456 |
|
| 457 |
static void |
| 458 |
module_init(void) |
| 459 |
{ |
| 460 |
mod_add_cmd(&sid_msgtab); |
| 461 |
mod_add_cmd(&server_msgtab); |
| 462 |
} |
| 463 |
|
| 464 |
static void |
| 465 |
module_exit(void) |
| 466 |
{ |
| 467 |
mod_del_cmd(&sid_msgtab); |
| 468 |
mod_del_cmd(&server_msgtab); |
| 469 |
} |
| 470 |
|
| 471 |
struct module module_entry = |
| 472 |
{ |
| 473 |
.node = { NULL, NULL, NULL }, |
| 474 |
.name = NULL, |
| 475 |
.version = "$Revision$", |
| 476 |
.handle = NULL, |
| 477 |
.modinit = module_init, |
| 478 |
.modexit = module_exit, |
| 479 |
.flags = MODULE_FLAG_CORE |
| 480 |
}; |
