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189935b1 | 1 | /* |
2 | * IRC - Internet Relay Chat, ircd/m_silence.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 | /** @file | |
24 | * @brief Handlers for SILENCE command. | |
11f9ccfa | 25 | * @version $Id: m_silence.c,v 1.11.2.2 2007/03/27 02:54:43 entrope Exp $ |
189935b1 | 26 | */ |
27 | ||
28 | #include "config.h" | |
29 | ||
30 | #include "channel.h" | |
31 | #include "client.h" | |
32 | #include "hash.h" | |
33 | #include "ircd.h" | |
34 | #include "ircd_features.h" | |
35 | #include "ircd_log.h" | |
36 | #include "ircd_reply.h" | |
37 | #include "ircd_snprintf.h" | |
38 | #include "ircd_string.h" | |
39 | #include "list.h" | |
40 | #include "msg.h" | |
41 | #include "numeric.h" | |
42 | #include "numnicks.h" | |
43 | #include "s_user.h" | |
44 | #include "send.h" | |
45 | #include "struct.h" | |
46 | ||
47 | /* #include <assert.h> -- Now using assert in ircd_log.h */ | |
48 | #include <stdlib.h> | |
49 | #include <string.h> | |
50 | ||
51 | /** Attempt to apply a SILENCE update to a user. | |
52 | * | |
53 | * Silences are propagated lazily between servers to save on bandwidth | |
54 | * and remote memory. Any removal and any silence exception must be | |
55 | * propagated until a server has not seen the mask being removed or | |
56 | * has no positive silences for the user. | |
57 | * | |
58 | * @param[in] sptr Client to update. | |
59 | * @param[in] mask Single silence mask to apply, optionally preceded by '+' or '-' and maybe '~'. | |
60 | * @return The new ban entry on success, NULL on failure. | |
61 | */ | |
62 | static struct Ban * | |
63 | apply_silence(struct Client *sptr, char *mask) | |
64 | { | |
65 | struct Ban *sile; | |
66 | int flags; | |
11f9ccfa | 67 | int res; |
9f8856e9 | 68 | char orig_mask[NICKLEN+USERLEN+HOSTLEN+3]; |
189935b1 | 69 | |
70 | assert(mask && mask[0]); | |
71 | ||
72 | /* Check for add or remove. */ | |
73 | if (mask[0] == '-') { | |
74 | flags = BAN_DEL; | |
75 | mask++; | |
76 | } else if (mask[0] == '+') { | |
77 | flags = BAN_ADD; | |
78 | mask++; | |
79 | } else | |
80 | flags = BAN_ADD; | |
81 | ||
82 | /* Check for being an exception. */ | |
83 | if (mask[0] == '~') { | |
84 | flags |= BAN_EXCEPTION; | |
85 | mask++; | |
86 | } | |
87 | ||
9f8856e9 | 88 | /* Make the silence and set additional flags. */ |
89 | ircd_strncpy(orig_mask, mask, sizeof(orig_mask) - 1); | |
189935b1 | 90 | sile = make_ban(pretty_mask(mask)); |
91 | sile->flags |= flags; | |
9f8856e9 | 92 | |
93 | /* If they're a local user trying to ban too broad a mask, forbid it. */ | |
94 | if (MyUser(sptr) | |
95 | && (sile->flags & BAN_IPMASK) | |
96 | && sile->addrbits > 0 | |
97 | && sile->addrbits < (irc_in_addr_is_ipv4(&sile->address) ? 112 : 32)) { | |
98 | send_reply(sptr, ERR_MASKTOOWIDE, orig_mask); | |
99 | free_ban(sile); | |
100 | return NULL; | |
101 | } | |
102 | ||
103 | /* Apply it to the silence list. */ | |
11f9ccfa | 104 | res = apply_ban(&cli_user(sptr)->silence, sile, 1); |
105 | return res ? NULL : sile; | |
189935b1 | 106 | } |
107 | ||
108 | /** Apply and send silence updates for a user. | |
109 | * @param[in] sptr Client whose silence list has been updated. | |
110 | * @param[in] silences Comma-separated list of silence updates. | |
111 | * @param[in] dest Direction to send updates in (NULL for broadcast). | |
112 | */ | |
113 | static void | |
114 | forward_silences(struct Client *sptr, char *silences, struct Client *dest) | |
115 | { | |
116 | struct Ban *accepted[MAXPARA], *sile, **plast; | |
117 | char *cp, *p, buf[BUFSIZE]; | |
118 | size_t ac_count, buf_used, slen, ii; | |
119 | ||
120 | /* Split the list of silences and try to apply each one in turn. */ | |
121 | for (cp = ircd_strtok(&p, silences, ","), ac_count = 0; | |
122 | cp && (ac_count < MAXPARA); | |
123 | cp = ircd_strtok(&p, 0, ",")) { | |
124 | if ((sile = apply_silence(sptr, cp))) | |
125 | accepted[ac_count++] = sile; | |
126 | } | |
127 | ||
189935b1 | 128 | if (MyUser(sptr)) { |
129 | size_t siles, maxsiles, totlength, maxlength, jj; | |
130 | ||
131 | /* Check that silence count and total length are permitted. */ | |
132 | maxsiles = feature_int(FEAT_MAXSILES); | |
133 | maxlength = maxsiles * feature_int(FEAT_AVBANLEN); | |
134 | siles = totlength = 0; | |
135 | /* Count number of current silences and their total length. */ | |
136 | plast = &cli_user(sptr)->silence; | |
137 | for (sile = cli_user(sptr)->silence; sile; sile = sile->next) { | |
138 | if (sile->flags & (BAN_OVERLAPPED | BAN_ADD | BAN_DEL)) | |
139 | continue; | |
140 | siles++; | |
141 | totlength += strlen(sile->banstr); | |
142 | plast = &sile->next; | |
143 | } | |
144 | for (ii = jj = 0; ii < ac_count; ++ii) { | |
145 | sile = accepted[ii]; | |
146 | /* If the update is being added, and we would exceed the maximum | |
147 | * count or length, drop the update. | |
148 | */ | |
149 | if (!(sile->flags & (BAN_OVERLAPPED | BAN_DEL))) { | |
150 | slen = strlen(sile->banstr); | |
151 | if ((siles >= maxsiles) || (totlength + slen >= maxlength)) { | |
152 | *plast = NULL; | |
153 | if (MyUser(sptr)) | |
154 | send_reply(sptr, ERR_SILELISTFULL, accepted[ii]->banstr); | |
155 | free_ban(accepted[ii]); | |
156 | continue; | |
157 | } | |
158 | /* Update counts. */ | |
159 | siles++; | |
160 | totlength += slen; | |
161 | plast = &sile->next; | |
162 | } | |
163 | /* Store the update. */ | |
164 | accepted[jj++] = sile; | |
165 | } | |
166 | /* Write back the number of accepted updates. */ | |
167 | ac_count = jj; | |
168 | ||
169 | /* Send the silence update list, including overlapped silences (to | |
170 | * make it easier on clients). | |
171 | */ | |
172 | buf_used = 0; | |
173 | for (sile = cli_user(sptr)->silence; sile; sile = sile->next) { | |
174 | char ch; | |
175 | if (sile->flags & (BAN_OVERLAPPED | BAN_DEL)) | |
176 | ch = '-'; | |
177 | else if (sile->flags & BAN_ADD) | |
178 | ch = '+'; | |
179 | else | |
180 | continue; | |
181 | slen = strlen(sile->banstr); | |
182 | if (buf_used + slen + 4 > 400) { | |
183 | buf[buf_used] = '\0'; | |
184 | sendcmdto_one(sptr, CMD_SILENCE, sptr, "%s", buf); | |
185 | buf_used = 0; | |
186 | } | |
187 | if (buf_used) | |
188 | buf[buf_used++] = ','; | |
189 | buf[buf_used++] = ch; | |
190 | if (sile->flags & BAN_EXCEPTION) | |
191 | buf[buf_used++] = '~'; | |
192 | memcpy(buf + buf_used, sile->banstr, slen); | |
193 | buf_used += slen; | |
194 | } | |
195 | if (buf_used > 0) { | |
196 | buf[buf_used] = '\0'; | |
197 | sendcmdto_one(sptr, CMD_SILENCE, sptr, "%s", buf); | |
198 | buf_used = 0; | |
199 | } | |
200 | } | |
201 | ||
202 | /* Forward any silence removals or exceptions updates to other | |
203 | * servers if the user has positive silences. | |
204 | */ | |
205 | if (!dest || !MyUser(dest)) { | |
206 | for (ii = buf_used = 0; ii < ac_count; ++ii) { | |
207 | char ch; | |
208 | sile = accepted[ii]; | |
209 | if (sile->flags & BAN_OVERLAPPED) | |
210 | continue; | |
211 | else if (sile->flags & BAN_DEL) | |
212 | ch = '-'; | |
213 | else if (sile->flags & BAN_ADD) { | |
214 | if (!(sile->flags & BAN_EXCEPTION)) | |
215 | continue; | |
216 | ch = '+'; | |
217 | } else | |
218 | continue; | |
219 | slen = strlen(sile->banstr); | |
220 | if (buf_used + slen + 4 > 400) { | |
221 | buf[buf_used] = '\0'; | |
222 | if (dest) | |
223 | sendcmdto_one(sptr, CMD_SILENCE, dest, "%C %s", dest, buf); | |
224 | else | |
225 | sendcmdto_serv_butone(sptr, CMD_SILENCE, sptr, "* %s", buf); | |
226 | buf_used = 0; | |
227 | } | |
228 | if (buf_used) | |
229 | buf[buf_used++] = ','; | |
230 | buf[buf_used++] = ch; | |
231 | if (sile->flags & BAN_EXCEPTION) | |
232 | buf[buf_used++] = '~'; | |
233 | memcpy(buf + buf_used, sile->banstr, slen); | |
234 | buf_used += slen; | |
235 | } | |
236 | if (buf_used > 0) { | |
237 | buf[buf_used] = '\0'; | |
238 | if (dest) | |
239 | sendcmdto_one(sptr, CMD_SILENCE, dest, "%C %s", dest, buf); | |
240 | else | |
241 | sendcmdto_serv_butone(sptr, CMD_SILENCE, sptr, "* %s", buf); | |
242 | buf_used = 0; | |
243 | } | |
244 | } | |
245 | ||
246 | /* Remove overlapped and deleted silences from the user's silence | |
247 | * list. Clear BAN_ADD since we're walking the list anyway. | |
248 | */ | |
249 | for (plast = &cli_user(sptr)->silence; (sile = *plast) != NULL; ) { | |
250 | if (sile->flags & (BAN_OVERLAPPED | BAN_DEL)) { | |
251 | *plast = sile->next; | |
252 | free_ban(sile); | |
253 | } else { | |
254 | sile->flags &= ~BAN_ADD; | |
255 | *plast = sile; | |
256 | plast = &sile->next; | |
257 | } | |
258 | } | |
259 | ||
260 | /* Free any silence-deleting updates. */ | |
261 | for (ii = 0; ii < ac_count; ++ii) { | |
11f9ccfa | 262 | if ((accepted[ii]->flags & (BAN_ADD | BAN_DEL)) == BAN_DEL) { |
189935b1 | 263 | free_ban(accepted[ii]); |
11f9ccfa | 264 | } |
189935b1 | 265 | } |
266 | } | |
267 | ||
268 | /** Handle a SILENCE command from a local user. | |
269 | * See @ref m_functions for general discussion of parameters. | |
270 | * | |
271 | * \a parv[1] may be any of the following: | |
272 | * \li Omitted or empty, to view your own silence list. | |
273 | * \li Nickname of a user, to view that user's silence list. | |
274 | * \li A comma-separated list of silence updates | |
275 | * | |
276 | * @param[in] cptr Client that sent us the message. | |
277 | * @param[in] sptr Original source of message. | |
278 | * @param[in] parc Number of arguments. | |
279 | * @param[in] parv Argument vector. | |
280 | */ | |
281 | int m_silence(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
282 | { | |
283 | struct Client *acptr; | |
284 | struct Ban *sile; | |
285 | ||
286 | assert(0 != cptr); | |
287 | assert(cptr == sptr); | |
288 | ||
289 | /* See if the user is requesting a silence list. */ | |
290 | acptr = sptr; | |
291 | if (parc < 2 || EmptyString(parv[1]) || (acptr = FindUser(parv[1]))) { | |
292 | if (cli_user(acptr)) { | |
293 | for (sile = cli_user(acptr)->silence; sile; sile = sile->next) { | |
294 | send_reply(sptr, RPL_SILELIST, cli_name(acptr), | |
295 | (sile->flags & BAN_EXCEPTION ? "~" : ""), sile->banstr); | |
296 | } | |
297 | } | |
298 | send_reply(sptr, RPL_ENDOFSILELIST, cli_name(acptr)); | |
299 | return 0; | |
300 | } | |
301 | ||
302 | /* The user must be attempting to update their list. */ | |
303 | forward_silences(sptr, parv[1], NULL); | |
304 | return 0; | |
305 | } | |
306 | ||
307 | /** Handle a SILENCE command from a server. | |
308 | * See @ref m_functions for general discussion of parameters. | |
309 | * | |
310 | * \a parv[1] may be one of the following: | |
311 | * \li "*" to indicate a broadcast update (removing a SILENCE) | |
312 | * \li A client numnick that should be specifically SILENCEd. | |
313 | * | |
314 | * \a parv[2] is a comma-separated list of silence updates. | |
315 | * | |
316 | * @param[in] cptr Client that sent us the message. | |
317 | * @param[in] sptr Original source of message. | |
318 | * @param[in] parc Number of arguments. | |
319 | * @param[in] parv Argument vector. | |
320 | */ | |
321 | int ms_silence(struct Client* cptr, struct Client* sptr, int parc, char* parv[]) | |
322 | { | |
323 | if (IsServer(sptr)) | |
324 | return protocol_violation(sptr, "Server trying to silence a user"); | |
325 | if (parc < 3 || EmptyString(parv[2])) | |
326 | return need_more_params(sptr, "SILENCE"); | |
327 | ||
328 | /* Figure out which silences can be forwarded. */ | |
329 | forward_silences(sptr, parv[2], findNUser(parv[1])); | |
330 | return 0; | |
331 | (void)cptr; | |
332 | } |