--- /dev/null
+/*
+ * IRC - Internet Relay Chat, ircd/m_silence.c
+ * Copyright (C) 1990 Jarkko Oikarinen and
+ * University of Oulu, Computing Center
+ *
+ * See file AUTHORS in IRC package for additional names of
+ * the programmers.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 1, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+/** @file
+ * @brief Handlers for SILENCE command.
+ * @version $Id$
+ */
+
+#include "config.h"
+
+#include "channel.h"
+#include "client.h"
+#include "hash.h"
+#include "ircd.h"
+#include "ircd_features.h"
+#include "ircd_log.h"
+#include "ircd_reply.h"
+#include "ircd_snprintf.h"
+#include "ircd_string.h"
+#include "list.h"
+#include "msg.h"
+#include "numeric.h"
+#include "numnicks.h"
+#include "s_user.h"
+#include "send.h"
+#include "struct.h"
+
+/* #include <assert.h> -- Now using assert in ircd_log.h */
+#include <stdlib.h>
+#include <string.h>
+
+/** Attempt to apply a SILENCE update to a user.
+ *
+ * Silences are propagated lazily between servers to save on bandwidth
+ * and remote memory. Any removal and any silence exception must be
+ * propagated until a server has not seen the mask being removed or
+ * has no positive silences for the user.
+ *
+ * @param[in] sptr Client to update.
+ * @param[in] mask Single silence mask to apply, optionally preceded by '+' or '-' and maybe '~'.
+ * @return The new ban entry on success, NULL on failure.
+ */
+static struct Ban *
+apply_silence(struct Client *sptr, char *mask)
+{
+ struct Ban *sile;
+ int flags;
+ int res;
+ char orig_mask[NICKLEN+USERLEN+HOSTLEN+3];
+
+ assert(mask && mask[0]);
+
+ /* Check for add or remove. */
+ if (mask[0] == '-') {
+ flags = BAN_DEL;
+ mask++;
+ } else if (mask[0] == '+') {
+ flags = BAN_ADD;
+ mask++;
+ } else
+ flags = BAN_ADD;
+
+ /* Check for being an exception. */
+ if (mask[0] == '~') {
+ flags |= BAN_EXCEPTION;
+ mask++;
+ }
+
+ /* Make the silence and set additional flags. */
+ ircd_strncpy(orig_mask, mask, sizeof(orig_mask) - 1);
+ sile = make_ban(pretty_mask(mask));
+ sile->flags |= flags;
+
+ /* If they're a local user trying to ban too broad a mask, forbid it. */
+ if (MyUser(sptr)
+ && (sile->flags & BAN_IPMASK)
+ && sile->addrbits > 0
+ && sile->addrbits < (irc_in_addr_is_ipv4(&sile->address) ? 112 : 32)) {
+ send_reply(sptr, ERR_MASKTOOWIDE, orig_mask);
+ free_ban(sile);
+ return NULL;
+ }
+
+ /* Apply it to the silence list. */
+ res = apply_ban(&cli_user(sptr)->silence, sile, 1);
+ return res ? NULL : sile;
+}
+
+/** Apply and send silence updates for a user.
+ * @param[in] sptr Client whose silence list has been updated.
+ * @param[in] silences Comma-separated list of silence updates.
+ * @param[in] dest Direction to send updates in (NULL for broadcast).
+ */
+static void
+forward_silences(struct Client *sptr, char *silences, struct Client *dest)
+{
+ struct Ban *accepted[MAXPARA], *sile, **plast;
+ char *cp, *p, buf[BUFSIZE];
+ size_t ac_count, buf_used, slen, ii;
+
+ /* Split the list of silences and try to apply each one in turn. */
+ for (cp = ircd_strtok(&p, silences, ","), ac_count = 0;
+ cp && (ac_count < MAXPARA);
+ cp = ircd_strtok(&p, 0, ",")) {
+ if ((sile = apply_silence(sptr, cp)))
+ accepted[ac_count++] = sile;
+ }
+
+ if (MyUser(sptr)) {
+ size_t siles, maxsiles, totlength, maxlength, jj;
+
+ /* Check that silence count and total length are permitted. */
+ maxsiles = feature_int(FEAT_MAXSILES);
+ maxlength = maxsiles * feature_int(FEAT_AVBANLEN);
+ siles = totlength = 0;
+ /* Count number of current silences and their total length. */
+ plast = &cli_user(sptr)->silence;
+ for (sile = cli_user(sptr)->silence; sile; sile = sile->next) {
+ if (sile->flags & (BAN_OVERLAPPED | BAN_ADD | BAN_DEL))
+ continue;
+ siles++;
+ totlength += strlen(sile->banstr);
+ plast = &sile->next;
+ }
+ for (ii = jj = 0; ii < ac_count; ++ii) {
+ sile = accepted[ii];
+ /* If the update is being added, and we would exceed the maximum
+ * count or length, drop the update.
+ */
+ if (!(sile->flags & (BAN_OVERLAPPED | BAN_DEL))) {
+ slen = strlen(sile->banstr);
+ if ((siles >= maxsiles) || (totlength + slen >= maxlength)) {
+ *plast = NULL;
+ if (MyUser(sptr))
+ send_reply(sptr, ERR_SILELISTFULL, accepted[ii]->banstr);
+ free_ban(accepted[ii]);
+ continue;
+ }
+ /* Update counts. */
+ siles++;
+ totlength += slen;
+ plast = &sile->next;
+ }
+ /* Store the update. */
+ accepted[jj++] = sile;
+ }
+ /* Write back the number of accepted updates. */
+ ac_count = jj;
+
+ /* Send the silence update list, including overlapped silences (to
+ * make it easier on clients).
+ */
+ buf_used = 0;
+ for (sile = cli_user(sptr)->silence; sile; sile = sile->next) {
+ char ch;
+ if (sile->flags & (BAN_OVERLAPPED | BAN_DEL))
+ ch = '-';
+ else if (sile->flags & BAN_ADD)
+ ch = '+';
+ else
+ continue;
+ slen = strlen(sile->banstr);
+ if (buf_used + slen + 4 > 400) {
+ buf[buf_used] = '\0';
+ sendcmdto_one(sptr, CMD_SILENCE, sptr, "%s", buf);
+ buf_used = 0;
+ }
+ if (buf_used)
+ buf[buf_used++] = ',';
+ buf[buf_used++] = ch;
+ if (sile->flags & BAN_EXCEPTION)
+ buf[buf_used++] = '~';
+ memcpy(buf + buf_used, sile->banstr, slen);
+ buf_used += slen;
+ }
+ if (buf_used > 0) {
+ buf[buf_used] = '\0';
+ sendcmdto_one(sptr, CMD_SILENCE, sptr, "%s", buf);
+ buf_used = 0;
+ }
+ }
+
+ /* Forward any silence removals or exceptions updates to other
+ * servers if the user has positive silences.
+ */
+ if (!dest || !MyUser(dest)) {
+ for (ii = buf_used = 0; ii < ac_count; ++ii) {
+ char ch;
+ sile = accepted[ii];
+ if (sile->flags & BAN_OVERLAPPED)
+ continue;
+ else if (sile->flags & BAN_DEL)
+ ch = '-';
+ else if (sile->flags & BAN_ADD) {
+ if (!(sile->flags & BAN_EXCEPTION))
+ continue;
+ ch = '+';
+ } else
+ continue;
+ slen = strlen(sile->banstr);
+ if (buf_used + slen + 4 > 400) {
+ buf[buf_used] = '\0';
+ if (dest)
+ sendcmdto_one(sptr, CMD_SILENCE, dest, "%C %s", dest, buf);
+ else
+ sendcmdto_serv_butone(sptr, CMD_SILENCE, sptr, "* %s", buf);
+ buf_used = 0;
+ }
+ if (buf_used)
+ buf[buf_used++] = ',';
+ buf[buf_used++] = ch;
+ if (sile->flags & BAN_EXCEPTION)
+ buf[buf_used++] = '~';
+ memcpy(buf + buf_used, sile->banstr, slen);
+ buf_used += slen;
+ }
+ if (buf_used > 0) {
+ buf[buf_used] = '\0';
+ if (dest)
+ sendcmdto_one(sptr, CMD_SILENCE, dest, "%C %s", dest, buf);
+ else
+ sendcmdto_serv_butone(sptr, CMD_SILENCE, sptr, "* %s", buf);
+ buf_used = 0;
+ }
+ }
+
+ /* Remove overlapped and deleted silences from the user's silence
+ * list. Clear BAN_ADD since we're walking the list anyway.
+ */
+ for (plast = &cli_user(sptr)->silence; (sile = *plast) != NULL; ) {
+ if (sile->flags & (BAN_OVERLAPPED | BAN_DEL)) {
+ *plast = sile->next;
+ free_ban(sile);
+ } else {
+ sile->flags &= ~BAN_ADD;
+ *plast = sile;
+ plast = &sile->next;
+ }
+ }
+
+ /* Free any silence-deleting updates. */
+ for (ii = 0; ii < ac_count; ++ii) {
+ if ((accepted[ii]->flags & (BAN_ADD | BAN_DEL)) == BAN_DEL) {
+ free_ban(accepted[ii]);
+ }
+ }
+}
+
+/** Handle a SILENCE command from a local user.
+ * See @ref m_functions for general discussion of parameters.
+ *
+ * \a parv[1] may be any of the following:
+ * \li Omitted or empty, to view your own silence list.
+ * \li Nickname of a user, to view that user's silence list.
+ * \li A comma-separated list of silence updates
+ *
+ * @param[in] cptr Client that sent us the message.
+ * @param[in] sptr Original source of message.
+ * @param[in] parc Number of arguments.
+ * @param[in] parv Argument vector.
+ */
+int m_silence(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
+{
+ struct Client *acptr;
+ struct Ban *sile;
+
+ assert(0 != cptr);
+ assert(cptr == sptr);
+
+ /* See if the user is requesting a silence list. */
+ acptr = sptr;
+ if (parc < 2 || EmptyString(parv[1]) || (acptr = FindUser(parv[1]))) {
+ if (cli_user(acptr) && ((acptr == sptr) || IsChannelService(acptr))) {
+ for (sile = cli_user(acptr)->silence; sile; sile = sile->next) {
+ send_reply(sptr, RPL_SILELIST, cli_name(acptr),
+ (sile->flags & BAN_EXCEPTION ? "~" : ""), sile->banstr);
+ }
+ }
+ send_reply(sptr, RPL_ENDOFSILELIST, cli_name(acptr));
+ return 0;
+ }
+
+ /* The user must be attempting to update their list. */
+ forward_silences(sptr, parv[1], NULL);
+ return 0;
+}
+
+/** Handle a SILENCE command from a server.
+ * See @ref m_functions for general discussion of parameters.
+ *
+ * \a parv[1] may be one of the following:
+ * \li "*" to indicate a broadcast update (removing a SILENCE)
+ * \li A client numnick that should be specifically SILENCEd.
+ *
+ * \a parv[2] is a comma-separated list of silence updates.
+ *
+ * @param[in] cptr Client that sent us the message.
+ * @param[in] sptr Original source of message.
+ * @param[in] parc Number of arguments.
+ * @param[in] parv Argument vector.
+ */
+int ms_silence(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
+{
+ if (IsServer(sptr))
+ return protocol_violation(sptr, "Server trying to silence a user");
+ if (parc < 3 || EmptyString(parv[2]))
+ return need_more_params(sptr, "SILENCE");
+
+ /* Figure out which silences can be forwarded. */
+ forward_silences(sptr, parv[2], findNUser(parv[1]));
+ return 0;
+ (void)cptr;
+}
projects / ircu2.10.12-pk.git / blobdiff