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189935b1 | 1 | /* |
2 | * IRC - Internet Relay Chat, ircd/m_join.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_join.c,v 1.34.2.1 2005/10/06 23:58:09 entrope Exp $ | |
24 | */ | |
25 | ||
26 | #include "config.h" | |
27 | ||
28 | #include "channel.h" | |
29 | #include "client.h" | |
30 | #include "gline.h" | |
31 | #include "hash.h" | |
32 | #include "ircd.h" | |
33 | #include "ircd_chattr.h" | |
34 | #include "ircd_features.h" | |
35 | #include "ircd_log.h" | |
36 | #include "ircd_reply.h" | |
37 | #include "ircd_string.h" | |
38 | #include "msg.h" | |
39 | #include "numeric.h" | |
40 | #include "numnicks.h" | |
41 | #include "s_debug.h" | |
42 | #include "s_user.h" | |
43 | #include "send.h" | |
44 | #include "sys.h" | |
45 | ||
46 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
47 | #include <stdlib.h> | |
48 | #include <string.h> | |
49 | ||
50 | /** Searches for and handles a 0 in a join list. | |
51 | * @param[in] cptr Client that sent us the message. | |
52 | * @param[in] sptr Original source of message. | |
53 | * @param[in] chanlist List of channels to join. | |
54 | * @return First token in \a chanlist after the final 0 entry, which | |
55 | * may be its nul terminator (if the final entry is a 0 entry). | |
56 | */ | |
57 | static char * | |
58 | last0(struct Client *cptr, struct Client *sptr, char *chanlist) | |
59 | { | |
60 | char *p; | |
61 | int join0 = 0; | |
62 | ||
63 | for (p = chanlist; p[0]; p++) /* find last "JOIN 0" */ | |
64 | if (p[0] == '0' && (p[1] == ',' || p[1] == '\0')) { | |
65 | if (p[1] == ',') | |
66 | p++; | |
67 | chanlist = p + 1; | |
68 | join0 = 1; | |
69 | } else { | |
70 | while (p[0] != ',' && p[0] != '\0') /* skip past channel name */ | |
71 | p++; | |
72 | ||
73 | if (!p[0]) /* hit the end */ | |
74 | break; | |
75 | } | |
76 | ||
77 | if (join0) { | |
78 | struct JoinBuf part; | |
79 | struct Membership *member; | |
80 | ||
81 | joinbuf_init(&part, sptr, cptr, JOINBUF_TYPE_PARTALL, | |
82 | "Left all channels", 0); | |
83 | ||
84 | joinbuf_join(&part, 0, 0); | |
85 | ||
86 | while ((member = cli_user(sptr)->channel)) | |
87 | joinbuf_join(&part, member->channel, | |
88 | IsZombie(member) ? CHFL_ZOMBIE : | |
89 | IsDelayedJoin(member) ? CHFL_DELAYED : | |
90 | 0); | |
91 | ||
92 | joinbuf_flush(&part); | |
93 | } | |
94 | ||
95 | return chanlist; | |
96 | } | |
97 | ||
98 | /** Handle a JOIN message from a client connection. | |
99 | * See @ref m_functions for discussion of the arguments. | |
100 | * @param[in] cptr Client that sent us the message. | |
101 | * @param[in] sptr Original source of message. | |
102 | * @param[in] parc Number of arguments. | |
103 | * @param[in] parv Argument vector. | |
104 | */ | |
105 | int m_join(struct Client *cptr, struct Client *sptr, int parc, char *parv[]) | |
106 | { | |
107 | struct Channel *chptr; | |
108 | struct JoinBuf join; | |
109 | struct JoinBuf create; | |
110 | struct Gline *gline; | |
111 | char *p = 0; | |
112 | char *chanlist; | |
113 | char *name; | |
114 | char *keys; | |
115 | ||
116 | if (parc < 2 || *parv[1] == '\0') | |
117 | return need_more_params(sptr, "JOIN"); | |
118 | ||
119 | joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0); | |
120 | joinbuf_init(&create, sptr, cptr, JOINBUF_TYPE_CREATE, 0, TStime()); | |
121 | ||
122 | chanlist = last0(cptr, sptr, parv[1]); /* find last "JOIN 0" */ | |
123 | ||
124 | keys = parv[2]; /* remember where keys are */ | |
125 | ||
126 | for (name = ircd_strtok(&p, chanlist, ","); name; | |
127 | name = ircd_strtok(&p, 0, ",")) { | |
128 | char *key = 0; | |
129 | ||
130 | /* If we have any more keys, take the first for this channel. */ | |
131 | if (!BadPtr(keys) | |
132 | && (keys = strchr(key = keys, ','))) | |
133 | *keys++ = '\0'; | |
134 | ||
135 | /* Empty keys are the same as no keys. */ | |
136 | if (key && !key[0]) | |
137 | key = 0; | |
138 | ||
139 | if (!IsChannelName(name) || !strIsIrcCh(name)) | |
140 | { | |
141 | /* bad channel name */ | |
142 | send_reply(sptr, ERR_NOSUCHCHANNEL, name); | |
143 | continue; | |
144 | } | |
145 | ||
146 | if (cli_user(sptr)->joined >= feature_int(FEAT_MAXCHANNELSPERUSER) | |
147 | && !HasPriv(sptr, PRIV_CHAN_LIMIT)) { | |
148 | send_reply(sptr, ERR_TOOMANYCHANNELS, name); | |
149 | break; /* no point processing the other channels */ | |
150 | } | |
151 | ||
152 | /* BADCHANed channel */ | |
153 | if ((gline = gline_find(name, GLINE_BADCHAN | GLINE_EXACT)) && | |
154 | GlineIsActive(gline) && !IsAnOper(sptr)) { | |
155 | send_reply(sptr, ERR_BANNEDFROMCHAN, name); | |
156 | continue; | |
157 | } | |
158 | ||
159 | if (!(chptr = FindChannel(name))) { | |
160 | if (((name[0] == '&') && !feature_bool(FEAT_LOCAL_CHANNELS)) | |
161 | || strlen(name) >= IRCD_MIN(CHANNELLEN, feature_int(FEAT_CHANNELLEN))) { | |
162 | send_reply(sptr, ERR_NOSUCHCHANNEL, name); | |
163 | continue; | |
164 | } | |
165 | ||
166 | if (!(chptr = get_channel(sptr, name, CGT_CREATE))) | |
167 | continue; | |
168 | ||
169 | /* Try to add the new channel as a recent target for the user. */ | |
170 | if (check_target_limit(sptr, chptr, chptr->chname, 1)) { | |
171 | chptr->members = 0; | |
172 | destruct_channel(chptr); | |
173 | continue; | |
174 | } | |
175 | ||
176 | joinbuf_join(&create, chptr, CHFL_CHANOP | CHFL_CHANNEL_MANAGER); | |
177 | } else if (find_member_link(chptr, sptr)) { | |
178 | continue; /* already on channel */ | |
179 | } else if (check_target_limit(sptr, chptr, chptr->chname, 0)) { | |
180 | continue; | |
181 | } else { | |
182 | int flags = CHFL_DEOPPED; | |
183 | int err = 0; | |
184 | ||
185 | /* Check target change limits. */ | |
186 | ||
187 | /* Check Apass/Upass -- since we only ever look at a single | |
188 | * "key" per channel now, this hampers brute force attacks. */ | |
189 | if (key && !strcmp(key, chptr->mode.apass)) | |
190 | flags = CHFL_CHANOP | CHFL_CHANNEL_MANAGER; | |
191 | else if (key && !strcmp(key, chptr->mode.upass)) | |
192 | flags = CHFL_CHANOP; | |
193 | else if (IsInvited(sptr, chptr)) { | |
194 | /* Invites bypass these other checks. */ | |
195 | } else if (chptr->mode.mode & MODE_INVITEONLY) | |
196 | err = ERR_INVITEONLYCHAN; | |
197 | else if (chptr->mode.limit && (chptr->users >= chptr->mode.limit)) | |
198 | err = ERR_CHANNELISFULL; | |
199 | else if ((chptr->mode.mode & MODE_REGONLY) && !IsAccount(sptr)) | |
200 | err = ERR_NEEDREGGEDNICK; | |
201 | else if (find_ban(sptr, chptr->banlist)) | |
202 | err = ERR_BANNEDFROMCHAN; | |
203 | else if (*chptr->mode.key && (!key || strcmp(key, chptr->mode.key))) | |
204 | err = ERR_BADCHANNELKEY; | |
205 | ||
206 | /* An oper with WALK_LCHAN privilege can join a local channel | |
207 | * he otherwise could not join by using "OVERRIDE" as the key. | |
208 | * This will generate a HACK(4) notice, but fails if the oper | |
209 | * could normally join the channel. */ | |
210 | if (IsLocalChannel(chptr->chname) | |
211 | && HasPriv(sptr, PRIV_WALK_LCHAN) | |
212 | && !(flags & CHFL_CHANOP) | |
213 | && key && !strcmp(key, "OVERRIDE") | |
214 | && strcmp(chptr->mode.key, "OVERRIDE")) | |
215 | { | |
216 | switch (err) { | |
217 | case 0: | |
218 | send_reply(sptr, ERR_DONTCHEAT, chptr->chname); | |
219 | continue; | |
220 | case ERR_INVITEONLYCHAN: err = 'i'; break; | |
221 | case ERR_CHANNELISFULL: err = 'l'; break; | |
222 | case ERR_BANNEDFROMCHAN: err = 'b'; break; | |
223 | case ERR_BADCHANNELKEY: err = 'k'; break; | |
224 | case ERR_NEEDREGGEDNICK: err = 'r'; break; | |
225 | default: err = '?'; break; | |
226 | } | |
227 | /* send accountability notice */ | |
228 | sendto_opmask_butone(0, SNO_HACK4, "OPER JOIN: %C JOIN %H " | |
229 | "(overriding +%c)", sptr, chptr, err); | |
230 | err = 0; | |
231 | } | |
232 | ||
233 | /* Is there some reason the user may not join? */ | |
234 | if (err) { | |
235 | send_reply(sptr, err, chptr->chname); | |
236 | continue; | |
237 | } | |
238 | ||
239 | joinbuf_join(&join, chptr, flags); | |
240 | } | |
241 | ||
242 | del_invite(sptr, chptr); | |
243 | ||
244 | if (chptr->topic[0]) { | |
245 | send_reply(sptr, RPL_TOPIC, chptr->chname, chptr->topic); | |
246 | send_reply(sptr, RPL_TOPICWHOTIME, chptr->chname, chptr->topic_nick, | |
247 | chptr->topic_time); | |
248 | } | |
249 | ||
250 | do_names(sptr, chptr, NAMES_ALL|NAMES_EON); /* send /names list */ | |
251 | } | |
252 | ||
253 | joinbuf_flush(&join); /* must be first, if there's a JOIN 0 */ | |
254 | joinbuf_flush(&create); | |
255 | ||
256 | return 0; | |
257 | } | |
258 | ||
259 | /** Handle a JOIN message from a server connection. | |
260 | * See @ref m_functions for discussion of the arguments. | |
261 | * @param[in] cptr Client that sent us the message. | |
262 | * @param[in] sptr Original source of message. | |
263 | * @param[in] parc Number of arguments. | |
264 | * @param[in] parv Argument vector. | |
265 | */ | |
266 | int ms_join(struct Client *cptr, struct Client *sptr, int parc, char *parv[]) | |
267 | { | |
268 | struct Membership *member; | |
269 | struct Channel *chptr; | |
270 | struct JoinBuf join; | |
271 | unsigned int flags; | |
272 | time_t creation = 0; | |
273 | char *p = 0; | |
274 | char *chanlist; | |
275 | char *name; | |
276 | ||
277 | if (IsServer(sptr)) | |
278 | { | |
279 | return protocol_violation(cptr, | |
280 | "%s tried to JOIN %s, duh!", | |
281 | cli_name(sptr), | |
282 | (parc < 2 || *parv[1] == '\0') ? "a channel" : | |
283 | parv[1] | |
284 | ); | |
285 | } | |
286 | ||
287 | if (parc < 2 || *parv[1] == '\0') | |
288 | return need_more_params(sptr, "JOIN"); | |
289 | ||
290 | if (parc > 2 && parv[2]) | |
291 | creation = atoi(parv[2]); | |
292 | ||
293 | joinbuf_init(&join, sptr, cptr, JOINBUF_TYPE_JOIN, 0, 0); | |
294 | ||
295 | chanlist = last0(cptr, sptr, parv[1]); /* find last "JOIN 0" */ | |
296 | ||
297 | for (name = ircd_strtok(&p, chanlist, ","); name; | |
298 | name = ircd_strtok(&p, 0, ",")) { | |
299 | ||
300 | if (name[0] == '0' && name[1] == ':') | |
301 | { | |
302 | flags = CHFL_CHANOP | CHFL_CHANNEL_MANAGER; | |
303 | name += 2; | |
304 | } | |
305 | else if (name[0] == '1' && name[1] == ':') | |
306 | { | |
307 | flags = CHFL_CHANOP; | |
308 | name += 2; | |
309 | } | |
310 | else | |
311 | flags = CHFL_DEOPPED; | |
312 | ||
313 | if (IsLocalChannel(name) || !IsChannelName(name)) | |
314 | { | |
315 | protocol_violation(cptr, "%s tried to join %s", cli_name(sptr), name); | |
316 | continue; | |
317 | } | |
318 | ||
319 | if (!(chptr = FindChannel(name))) | |
320 | { | |
321 | /* No channel exists, so create one */ | |
322 | if (!(chptr = get_channel(sptr, name, CGT_CREATE))) | |
323 | { | |
324 | protocol_violation(sptr,"couldn't get channel %s for %s", | |
325 | name,cli_name(sptr)); | |
326 | continue; | |
327 | } | |
328 | flags |= HasFlag(sptr, FLAG_TS8) ? CHFL_SERVOPOK : 0; | |
329 | ||
330 | /* when the network is 2.10.11+ then remove MAGIC_REMOTE_JOIN_TS */ | |
331 | chptr->creationtime = creation ? creation : MAGIC_REMOTE_JOIN_TS; | |
332 | } | |
333 | else { /* We have a valid channel? */ | |
334 | if ((member = find_member_link(chptr, sptr))) | |
335 | { | |
336 | /* It is impossible to get here --Run */ | |
337 | if (!IsZombie(member)) /* already on channel */ | |
338 | continue; | |
339 | ||
340 | flags = member->status & (CHFL_DEOPPED | CHFL_SERVOPOK); | |
341 | remove_user_from_channel(sptr, chptr); | |
342 | chptr = FindChannel(name); | |
343 | } | |
344 | else | |
345 | flags |= HasFlag(sptr, FLAG_TS8) ? CHFL_SERVOPOK : 0; | |
346 | /* Always copy the timestamp when it is older, that is the only way to | |
347 | ensure network-wide synchronization of creation times. */ | |
348 | if (creation && creation < chptr->creationtime) | |
349 | chptr->creationtime = creation; | |
350 | } | |
351 | ||
352 | joinbuf_join(&join, chptr, flags); | |
353 | } | |
354 | ||
355 | joinbuf_flush(&join); /* flush joins... */ | |
356 | ||
357 | return 0; | |
358 | } |