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1 | /* | |
2 | * IRC - Internet Relay Chat, ircd/m_connect.c | |
3 | * Copyright (C) 1990 Jarkko Oikarinen and | |
4 | * University of Oulu, Computing Center | |
5 | * | |
6 | * See file AUTHORS in IRC package for additional names of | |
7 | * the programmers. | |
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 1, or (at your option) | |
12 | * 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., 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | * | |
23 | * $Id: m_connect.c,v 1.17 2004/12/11 05:13:46 klmitch Exp $ | |
24 | */ | |
25 | ||
26 | /* | |
27 | * m_functions execute protocol messages on this server: | |
28 | * | |
29 | * cptr is always NON-NULL, pointing to a *LOCAL* client | |
30 | * structure (with an open socket connected!). This | |
31 | * identifies the physical socket where the message | |
32 | * originated (or which caused the m_function to be | |
33 | * executed--some m_functions may call others...). | |
34 | * | |
35 | * sptr is the source of the message, defined by the | |
36 | * prefix part of the message if present. If not | |
37 | * or prefix not found, then sptr==cptr. | |
38 | * | |
39 | * (!IsServer(cptr)) => (cptr == sptr), because | |
40 | * prefixes are taken *only* from servers... | |
41 | * | |
42 | * (IsServer(cptr)) | |
43 | * (sptr == cptr) => the message didn't | |
44 | * have the prefix. | |
45 | * | |
46 | * (sptr != cptr && IsServer(sptr) means | |
47 | * the prefix specified servername. (?) | |
48 | * | |
49 | * (sptr != cptr && !IsServer(sptr) means | |
50 | * that message originated from a remote | |
51 | * user (not local). | |
52 | * | |
53 | * combining | |
54 | * | |
55 | * (!IsServer(sptr)) means that, sptr can safely | |
56 | * taken as defining the target structure of the | |
57 | * message in this server. | |
58 | * | |
59 | * *Always* true (if 'parse' and others are working correct): | |
60 | * | |
61 | * 1) sptr->from == cptr (note: cptr->from == cptr) | |
62 | * | |
63 | * 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr | |
64 | * *cannot* be a local connection, unless it's | |
65 | * actually cptr!). [MyConnect(x) should probably | |
66 | * be defined as (x == x->from) --msa ] | |
67 | * | |
68 | * parc number of variable parameter strings (if zero, | |
69 | * parv is allowed to be NULL) | |
70 | * | |
71 | * parv a NULL terminated list of parameter pointers, | |
72 | * | |
73 | * parv[0], sender (prefix string), if not present | |
74 | * this points to an empty string. | |
75 | * parv[1]...parv[parc-1] | |
76 | * pointers to additional parameters | |
77 | * parv[parc] == NULL, *always* | |
78 | * | |
79 | * note: it is guaranteed that parv[0]..parv[parc-1] are all | |
80 | * non-NULL pointers. | |
81 | */ | |
82 | #include "config.h" | |
83 | ||
84 | #include "client.h" | |
85 | #include "crule.h" | |
86 | #include "hash.h" | |
87 | #include "ircd.h" | |
88 | #include "ircd_features.h" | |
89 | #include "ircd_log.h" | |
90 | #include "ircd_reply.h" | |
91 | #include "ircd_string.h" | |
92 | #include "jupe.h" | |
93 | #include "match.h" | |
94 | #include "msg.h" | |
95 | #include "numeric.h" | |
96 | #include "numnicks.h" | |
97 | #include "s_bsd.h" | |
98 | #include "s_conf.h" | |
99 | #include "s_user.h" | |
100 | #include "send.h" | |
101 | ||
102 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
103 | #include <stdlib.h> | |
104 | ||
105 | /* | |
106 | * ms_connect - server message handler | |
107 | * - Added by Jto 11 Feb 1989 | |
108 | * | |
109 | * parv[0] = sender prefix | |
110 | * parv[1] = servername | |
111 | * parv[2] = port number | |
112 | * parv[3] = remote server | |
113 | */ | |
114 | int ms_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
115 | { | |
116 | unsigned short port; | |
117 | unsigned short tmpport; | |
118 | const char* rule; | |
119 | struct ConfItem* aconf; | |
120 | struct Client* acptr; | |
121 | struct Jupe* ajupe; | |
122 | ||
123 | assert(0 != cptr); | |
124 | assert(0 != sptr); | |
125 | ||
126 | if (!IsPrivileged(sptr)) | |
127 | return send_reply(sptr, ERR_NOPRIVILEGES); | |
128 | ||
129 | if (parc < 4) { | |
130 | /* | |
131 | * this is coming from a server which should have already | |
132 | * checked it's args, if we don't have parc == 4, something | |
133 | * isn't right. | |
134 | */ | |
135 | protocol_violation(sptr, "Too few parameters to connect"); | |
136 | return need_more_params(sptr, "CONNECT"); | |
137 | } | |
138 | ||
139 | if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc, parv) | |
140 | != HUNTED_ISME) | |
141 | return 0; | |
142 | ||
143 | /* | |
144 | * need to find the conf entry first so we can use the server name from | |
145 | * the conf entry instead of parv[1] to find out if the server is already | |
146 | * present below. --Bleep | |
147 | */ | |
148 | if (0 == (aconf = conf_find_server(parv[1]))) { | |
149 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed " | |
150 | "in ircd.conf", sptr, parv[1]); | |
151 | return 0; | |
152 | } | |
153 | /* | |
154 | * use aconf->name to look up the server | |
155 | */ | |
156 | if ((acptr = FindServer(aconf->name))) { | |
157 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already " | |
158 | "exists from %s", sptr, parv[1], cli_name(cli_from(acptr))); | |
159 | return 0; | |
160 | } | |
161 | /* | |
162 | * Evaluate connection rules... If no rules found, allow the | |
163 | * connect. Otherwise stop with the first true rule (ie: rules | |
164 | * are ored together. Oper connects are effected only by D | |
165 | * lines (CRULEALL) not d lines (CRULEAUTO). | |
166 | */ | |
167 | if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) { | |
168 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule); | |
169 | return 0; | |
170 | } | |
171 | /* | |
172 | * Check to see if the server is juped; if it is, disallow the connect | |
173 | */ | |
174 | if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) { | |
175 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s", | |
176 | sptr, JupeServer(ajupe), JupeReason(ajupe)); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | /* | |
181 | * Allow opers to /connect foo.* 0 bah.* to connect foo and bah | |
182 | * using the conf's configured port | |
183 | */ | |
184 | port = atoi(parv[2]); | |
185 | /* | |
186 | * save the old port | |
187 | */ | |
188 | tmpport = aconf->address.port; | |
189 | if (port) | |
190 | aconf->address.port = port; | |
191 | else | |
192 | port = aconf->address.port; | |
193 | ||
194 | /* | |
195 | * Notify all operators about remote connect requests | |
196 | */ | |
197 | sendwallto_group_butone(&me, WALL_WALLOPS, 0, | |
198 | "Remote CONNECT %s %s from %s", parv[1], | |
199 | parv[2] ? parv[2] : "", | |
200 | get_client_name(sptr, HIDE_IP)); | |
201 | log_write(LS_NETWORK, L_INFO, 0, "CONNECT From %C : %s %s", sptr, parv[1], | |
202 | parv[2] ? parv[2] : ""); | |
203 | ||
204 | if (connect_server(aconf, sptr)) { | |
205 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr, | |
206 | aconf->name); | |
207 | } | |
208 | else { | |
209 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed", | |
210 | sptr, aconf->name); | |
211 | } | |
212 | aconf->address.port = tmpport; | |
213 | return 0; | |
214 | } | |
215 | ||
216 | /* | |
217 | * mo_connect - oper message handler | |
218 | * - Added by Jto 11 Feb 1989 | |
219 | * | |
220 | * parv[0] = sender prefix | |
221 | * parv[1] = servername | |
222 | * parv[2] = port number | |
223 | * parv[3] = remote server | |
224 | */ | |
225 | int mo_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
226 | { | |
227 | unsigned short port; | |
228 | unsigned short tmpport; | |
229 | const char* rule; | |
230 | struct ConfItem* aconf; | |
231 | struct Client* acptr; | |
232 | struct Jupe* ajupe; | |
233 | ||
234 | assert(0 != cptr); | |
235 | assert(cptr == sptr); | |
236 | assert(IsAnOper(sptr)); | |
237 | ||
238 | if (parc < 2) | |
239 | return need_more_params(sptr, "CONNECT"); | |
240 | ||
241 | if (parc > 3) { | |
242 | /* | |
243 | * if parc > 3, we are trying to connect two remote | |
244 | * servers to each other | |
245 | */ | |
246 | if (IsLocOp(sptr)) { | |
247 | /* | |
248 | * Only allow LocOps to make local CONNECTS --SRB | |
249 | */ | |
250 | return 0; | |
251 | } | |
252 | else { | |
253 | struct Client* acptr2; | |
254 | struct Client* acptr3; | |
255 | ||
256 | if (!(acptr3 = find_match_server(parv[3]))) { | |
257 | send_reply(sptr, ERR_NOSUCHSERVER, parv[3]); | |
258 | return 0; | |
259 | } | |
260 | ||
261 | /* | |
262 | * Look for closest matching server | |
263 | * needed for "/connect blah 4400 *"? | |
264 | */ | |
265 | for (acptr2 = acptr3; acptr2 != &me; acptr2 = cli_serv(acptr2)->up) { | |
266 | if (!match(parv[3], cli_name(acptr2))) | |
267 | acptr3 = acptr2; | |
268 | } | |
269 | parv[3] = cli_name(acptr3); | |
270 | if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc, | |
271 | parv) != HUNTED_ISME) | |
272 | return 0; | |
273 | } | |
274 | } | |
275 | /* | |
276 | * need to find the conf entry first so we can use the server name from | |
277 | * the conf entry instead of parv[1] to find out if the server is already | |
278 | * present below. --Bleep | |
279 | */ | |
280 | if (0 == (aconf = conf_find_server(parv[1]))) { | |
281 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed " | |
282 | "in ircd.conf", sptr, parv[1]); | |
283 | return 0; | |
284 | } | |
285 | /* | |
286 | * use aconf->name to look up the server, see above | |
287 | */ | |
288 | if ((acptr = FindServer(aconf->name))) { | |
289 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already " | |
290 | "exists from %s", sptr, parv[1], cli_name(cli_from(acptr))); | |
291 | return 0; | |
292 | } | |
293 | /* | |
294 | * Evaluate connection rules... If no rules found, allow the | |
295 | * connect. Otherwise stop with the first true rule (ie: rules | |
296 | * are ored together. Oper connects are effected only by D | |
297 | * lines (CRULEALL) not d lines (CRULEAUTO). | |
298 | */ | |
299 | if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) { | |
300 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule); | |
301 | return 0; | |
302 | } | |
303 | /* | |
304 | * Check to see if the server is juped; if it is, disallow the connect | |
305 | */ | |
306 | if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) { | |
307 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s", | |
308 | sptr, JupeServer(ajupe), JupeReason(ajupe)); | |
309 | return 0; | |
310 | } | |
311 | /* | |
312 | * Get port number from user, if given. If not specified, | |
313 | * use the default from configuration structure. If missing | |
314 | * from there, then use the precompiled default. | |
315 | */ | |
316 | port = aconf->address.port; | |
317 | if (parc > 2) { | |
318 | assert(0 != parv[2]); | |
319 | if (0 == (port = atoi(parv[2]))) { | |
320 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Invalid port number", | |
321 | sptr); | |
322 | return 0; | |
323 | } | |
324 | } | |
325 | if (0 == port && 0 == (port = feature_int(FEAT_SERVER_PORT))) { | |
326 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: missing port number", | |
327 | sptr); | |
328 | return 0; | |
329 | } | |
330 | ||
331 | tmpport = aconf->address.port; | |
332 | aconf->address.port = port; | |
333 | ||
334 | if (connect_server(aconf, sptr)) { | |
335 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr, | |
336 | aconf->name); | |
337 | } | |
338 | else { | |
339 | sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed", | |
340 | sptr, aconf->name); | |
341 | } | |
342 | aconf->address.port = tmpport; | |
343 | return 0; | |
344 | } |