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189935b1 | 1 | /* |
2 | * IRC - Internet Relay Chat, ircd/m_topic.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_topic.c,v 1.21 2005/08/17 02:35:36 entrope 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 "channel.h" | |
85 | #include "client.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 "msg.h" | |
93 | #include "numeric.h" | |
94 | #include "numnicks.h" | |
95 | #include "send.h" | |
96 | ||
97 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
98 | #include <stdlib.h> /* for atoi() */ | |
99 | ||
100 | static void do_settopic(struct Client *sptr, struct Client *cptr, | |
101 | struct Channel *chptr, char *topic, time_t ts) | |
102 | { | |
103 | struct Client *from; | |
104 | int newtopic; | |
105 | ||
106 | if (feature_bool(FEAT_HIS_BANWHO) && IsServer(sptr)) | |
107 | from = &his; | |
108 | else | |
109 | from = sptr; | |
110 | if (IsChannelService(sptr)) | |
111 | { | |
112 | /* allow off-channel services to set the topic of any channel */ | |
113 | } | |
114 | else if ((chptr->mode.mode & MODE_TOPICLIMIT) && !is_chan_op(sptr, chptr)) | |
115 | { | |
116 | /* if +t and not @'d, return an error and ignore the topic */ | |
117 | send_reply(sptr, ERR_CHANOPRIVSNEEDED, chptr->chname); | |
118 | return; | |
119 | } | |
120 | else if (!client_can_send_to_channel(sptr, chptr, 1)) | |
121 | { | |
122 | send_reply(sptr, ERR_CANNOTSENDTOCHAN, chptr->chname); | |
123 | return; | |
124 | } | |
125 | /* Note if this is just a refresh of an old topic, and don't | |
126 | * send it to all the clients to save bandwidth. We still send | |
127 | * it to other servers as they may have split and lost the topic. | |
128 | */ | |
129 | newtopic=ircd_strncmp(chptr->topic,topic,TOPICLEN)!=0; | |
130 | /* setting a topic */ | |
131 | ircd_strncpy(chptr->topic, topic, TOPICLEN); | |
132 | ircd_strncpy(chptr->topic_nick, cli_name(from), NICKLEN); | |
133 | chptr->topic_time = ts ? ts : TStime(); | |
134 | /* Fixed in 2.10.11: Don't propagate local topics */ | |
135 | if (!IsLocalChannel(chptr->chname)) | |
136 | sendcmdto_serv_butone(sptr, CMD_TOPIC, cptr, "%H %Tu %Tu :%s", chptr, | |
137 | chptr->creationtime, chptr->topic_time, chptr->topic); | |
138 | if (newtopic) | |
139 | sendcmdto_channel_butserv_butone(from, CMD_TOPIC, chptr, NULL, 0, | |
140 | "%H :%s", chptr, chptr->topic); | |
141 | /* if this is the same topic as before we send it to the person that | |
142 | * set it (so they knew it went through ok), but don't bother sending | |
143 | * it to everyone else on the channel to save bandwidth | |
144 | */ | |
145 | else if (MyUser(sptr)) | |
146 | sendcmdto_one(sptr, CMD_TOPIC, sptr, "%H :%s", chptr, chptr->topic); | |
147 | } | |
148 | ||
149 | /* | |
150 | * m_topic - generic message handler | |
151 | * | |
152 | * parv[0] = sender prefix | |
153 | * parv[1] = channel | |
154 | * parv[parc - 1] = topic (if parc > 2) | |
155 | */ | |
156 | int m_topic(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
157 | { | |
158 | struct Channel *chptr; | |
159 | char *topic = 0, *name, *p = 0; | |
160 | ||
161 | if (parc < 2) | |
162 | return need_more_params(sptr, "TOPIC"); | |
163 | ||
164 | if (parc > 2) | |
165 | topic = parv[parc - 1]; | |
166 | ||
167 | for (; (name = ircd_strtok(&p, parv[1], ",")); parv[1] = 0) | |
168 | { | |
169 | chptr = 0; | |
170 | /* Does the channel exist */ | |
171 | if (!IsChannelName(name) || !(chptr = FindChannel(name))) | |
172 | { | |
173 | send_reply(sptr,ERR_NOSUCHCHANNEL,name); | |
174 | continue; | |
175 | } | |
176 | /* Trying to check a topic outside a secret channel */ | |
177 | if ((topic || SecretChannel(chptr)) && !find_channel_member(sptr, chptr)) | |
178 | { | |
179 | send_reply(sptr, ERR_NOTONCHANNEL, chptr->chname); | |
180 | continue; | |
181 | } | |
182 | ||
183 | /* only asking for topic */ | |
184 | if (!topic) | |
185 | { | |
186 | if (chptr->topic[0] == '\0') | |
187 | send_reply(sptr, RPL_NOTOPIC, chptr->chname); | |
188 | else | |
189 | { | |
190 | send_reply(sptr, RPL_TOPIC, chptr->chname, chptr->topic); | |
191 | send_reply(sptr, RPL_TOPICWHOTIME, chptr->chname, chptr->topic_nick, | |
192 | chptr->topic_time); | |
193 | } | |
194 | } | |
195 | else | |
196 | do_settopic(sptr,cptr,chptr,topic,0); | |
197 | } | |
198 | return 0; | |
199 | } | |
200 | ||
201 | /* | |
202 | * ms_topic - server message handler | |
203 | * | |
204 | * parv[0] = sender prefix | |
205 | * parv[1] = channel | |
206 | * parv[2] = channel timestamp (optional) | |
207 | * parv[3] = topic timestamp (optional) | |
208 | * parv[parc - 1] = topic | |
209 | */ | |
210 | int ms_topic(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
211 | { | |
212 | struct Channel *chptr; | |
213 | char *topic = 0, *name, *p = 0; | |
214 | time_t ts = 0; | |
215 | ||
216 | if (parc < 3) | |
217 | return need_more_params(sptr, "TOPIC"); | |
218 | ||
219 | topic = parv[parc - 1]; | |
220 | ||
221 | for (; (name = ircd_strtok(&p, parv[1], ",")); parv[1] = 0) | |
222 | { | |
223 | chptr = 0; | |
224 | /* Does the channel exist */ | |
225 | if (!IsChannelName(name) || !(chptr = FindChannel(name))) | |
226 | { | |
227 | send_reply(sptr,ERR_NOSUCHCHANNEL,name); | |
228 | continue; | |
229 | } | |
230 | ||
231 | /* Ignore requests for topics from remote servers */ | |
232 | if (IsLocalChannel(name) && !MyUser(sptr)) | |
233 | { | |
234 | protocol_violation(sptr,"Topic request"); | |
235 | continue; | |
236 | } | |
237 | ||
238 | /* If existing channel is older or has newer topic, ignore */ | |
239 | if (parc > 3 && (ts = atoi(parv[2])) && chptr->creationtime < ts) | |
240 | continue; | |
241 | ||
242 | if (parc > 4 && (ts = atoi(parv[3])) && chptr->topic_time > ts) | |
243 | continue; | |
244 | ||
245 | do_settopic(sptr,cptr,chptr,topic, ts); | |
246 | } | |
247 | return 0; | |
248 | } |