2 * IRC - Internet Relay Chat, ircd/m_silence.c
3 * Copyright (C) 1990 Jarkko Oikarinen and
4 * University of Oulu, Computing Center
6 * See file AUTHORS in IRC package for additional names of
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)
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.
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.
24 * @brief Handlers for SILENCE command.
34 #include "ircd_features.h"
35 #include "ircd_reply.h"
36 #include "ircd_snprintf.h"
37 #include "ircd_string.h"
50 /** Attempt to apply a SILENCE update to a user.
52 * Silences are propagated lazily between servers to save on bandwidth
53 * and remote memory. Any removal and any silence exception must be
54 * propagated until a server has not seen the mask being removed or
55 * has no positive silences for the user.
57 * @param[in] sptr Client to update.
58 * @param[in] mask Single silence mask to apply, optionally preceded by '+' or '-' and maybe '~'.
59 * @return The new ban entry on success, NULL on failure.
62 apply_silence(struct Client *sptr, const char *mask)
67 assert(mask && mask[0]);
69 /* Check for add or remove. */
73 } else if (mask[0] == '+') {
79 /* Check for being an exception. */
81 flags |= BAN_EXCEPTION;
85 /* Make the silence, set flags, and apply it. */
86 sile = make_ban(mask);
88 return apply_ban(&cli_user(sptr)->silence, sile) ? NULL : sile;
91 /** Apply and send silence updates for a user.
92 * @param[in] sptr Client whose silence list has been updated.
93 * @param[in] silences Comma-separated list of silence updates.
94 * @param[in] dest Direction to send updates in (NULL for broadcast).
97 forward_silences(struct Client *sptr, char *silences, struct Client *dest)
99 struct Ban *accepted[MAXPARA], *sile, **plast;
100 char *cp, *p, buf[BUFSIZE];
101 size_t ac_count, buf_used, slen, ii;
103 /* Split the list of silences and try to apply each one in turn. */
104 for (cp = ircd_strtok(&p, silences, ","), ac_count = 0;
105 cp && (ac_count < MAXPARA);
106 cp = ircd_strtok(&p, 0, ",")) {
107 if ((sile = apply_silence(sptr, cp)))
108 accepted[ac_count++] = sile;
113 size_t siles, maxsiles, totlength, maxlength, jj;
115 /* Check that silence count and total length are permitted. */
116 maxsiles = feature_int(FEAT_MAXSILES);
117 maxlength = maxsiles * feature_int(FEAT_AVBANLEN);
118 siles = totlength = 0;
119 /* Count number of current silences and their total length. */
120 for (sile = cli_user(sptr)->silence; sile; sile = sile->next) {
121 if (sile->flags & (BAN_OVERLAPPED | BAN_ADD | BAN_DEL))
124 totlength += strlen(sile->banstr);
126 for (ii = jj = 0; ii < ac_count; ++ii) {
128 /* If the update is being added, and we would exceed the maximum
129 * count or length, drop the update.
131 if (!(sile->flags & (BAN_OVERLAPPED | BAN_DEL))) {
132 slen = strlen(sile->banstr);
133 if ((siles >= maxsiles) || (totlength + slen >= maxlength)) {
134 free_ban(accepted[ii]);
141 /* Store the update. */
142 accepted[jj++] = sile;
144 /* Write back the number of accepted updates. */
147 /* Send the silence update list, including overlapped silences (to
148 * make it easier on clients).
151 for (sile = cli_user(sptr)->silence; sile; sile = sile->next) {
153 if (sile->flags & (BAN_OVERLAPPED | BAN_DEL))
155 else if (sile->flags & BAN_ADD)
159 slen = strlen(sile->banstr);
160 if (buf_used + slen + 4 > 400) {
161 buf[buf_used] = '\0';
162 sendcmdto_one(sptr, CMD_SILENCE, sptr, "%s", buf);
166 buf[buf_used++] = ',';
167 buf[buf_used++] = ch;
168 if (sile->flags & BAN_EXCEPTION)
169 buf[buf_used++] = '~';
170 memcpy(buf + buf_used, sile->banstr, slen);
174 buf[buf_used] = '\0';
175 sendcmdto_one(sptr, CMD_SILENCE, sptr, "%s", buf);
180 /* Forward any silence removals or exceptions updates to other
181 * servers if the user has positive silences.
183 if (!dest || !MyUser(dest)) {
184 for (ii = buf_used = 0; ii < ac_count; ++ii) {
187 if (sile->flags & BAN_OVERLAPPED)
189 else if (sile->flags & BAN_DEL)
191 else if (sile->flags & BAN_ADD) {
192 if (!(sile->flags & BAN_EXCEPTION))
197 slen = strlen(sile->banstr);
198 if (buf_used + slen + 4 > 400) {
199 buf[buf_used] = '\0';
201 sendcmdto_one(sptr, CMD_SILENCE, dest, "%C %s", dest, buf);
203 sendcmdto_serv_butone(sptr, CMD_SILENCE, sptr, "* %s", buf);
207 buf[buf_used++] = ',';
208 buf[buf_used++] = ch;
209 if (sile->flags & BAN_EXCEPTION)
210 buf[buf_used++] = '~';
211 memcpy(buf + buf_used, sile->banstr, slen);
215 buf[buf_used] = '\0';
217 sendcmdto_one(sptr, CMD_SILENCE, dest, "%C %s", dest, buf);
219 sendcmdto_serv_butone(sptr, CMD_SILENCE, sptr, "* %s", buf);
224 /* Remove overlapped and deleted silences from the user's silence
225 * list. Clear BAN_ADD since we're walking the list anyway.
227 for (plast = &cli_user(sptr)->silence; (sile = *plast) != NULL; ) {
228 if (sile->flags & (BAN_OVERLAPPED | BAN_DEL)) {
232 sile->flags &= ~BAN_ADD;
238 /* Free any silence-deleting updates. */
239 for (ii = 0; ii < ac_count; ++ii) {
240 if (accepted[ii]->flags & BAN_DEL)
241 free_ban(accepted[ii]);
245 /** Handle a SILENCE command from a local user.
246 * See @ref m_functions for general discussion of parameters.
248 * \a parv[1] may be any of the following:
249 * \li Omitted or empty, to view your own silence list.
250 * \li Nickname of a user, to view that user's silence list.
251 * \li A comma-separated list of silence updates
253 * @param[in] cptr Client that sent us the message.
254 * @param[in] sptr Original source of message.
255 * @param[in] parc Number of arguments.
256 * @param[in] parv Argument vector.
258 int m_silence(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
260 struct Client *acptr;
264 assert(cptr == sptr);
266 /* See if the user is requesting a silence list. */
268 if (parc < 2 || EmptyString(parv[1]) || (acptr = FindUser(parv[1]))) {
269 if (cli_user(acptr)) {
270 for (sile = cli_user(acptr)->silence; sile; sile = sile->next) {
271 send_reply(sptr, RPL_SILELIST, cli_name(acptr),
272 (sile->flags & BAN_EXCEPTION ? "~" : ""), sile->banstr);
275 send_reply(sptr, RPL_ENDOFSILELIST, cli_name(acptr));
279 /* The user must be attempting to update their list. */
280 forward_silences(sptr, parv[1], NULL);
284 /** Handle a SILENCE command from a server.
285 * See @ref m_functions for general discussion of parameters.
287 * \a parv[1] may be one of the following:
288 * \li "*" to indicate a broadcast update (removing a SILENCE)
289 * \li A client numnick that should be specifically SILENCEd.
291 * \a parv[2] is a comma-separated list of silence updates.
293 * @param[in] cptr Client that sent us the message.
294 * @param[in] sptr Original source of message.
295 * @param[in] parc Number of arguments.
296 * @param[in] parv Argument vector.
298 int ms_silence(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
301 return protocol_violation(sptr, "Server trying to silence a user");
302 if (parc < 3 || EmptyString(parv[2]))
303 return need_more_params(sptr, "SILENCE");
305 /* Figure out which silences can be forwarded. */
306 forward_silences(sptr, parv[2], findNUser(parv[1]));