ircd/m_topic.c

   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 1.21.2.1 2005/12/31 01:41:40 entrope Exp $
  24  */
  25
  26 #include "config.h"
  27
  28 #include "channel.h"
  29 #include "client.h"
  30 #include "hash.h"
  31 #include "ircd.h"
  32 #include "ircd_features.h"
  33 #include "ircd_log.h"
  34 #include "ircd_reply.h"
  35 #include "ircd_string.h"
  36 #include "msg.h"
  37 #include "numeric.h"
  38 #include "numnicks.h"
  39 #include "send.h"
  40
  41 /* #include <assert.h> -- Now using assert in ircd_log.h */
  42 #include <stdlib.h> /* for atoi() */
  43
  44 /** Set a channel topic or report an error.
  45  * @param[in] sptr Original topic setter.
  46  * @param[in] cptr Neighbor that sent the topic message.
  47  * @param[in] chptr Channel to set topic on.
  48  * @param[in] topic New topic.
  49  * @param[in] ts Timestamp that topic was set (0 for current time).
  50  */
  51 static void do_settopic(struct Client *sptr, struct Client *cptr,
  52                         struct Channel *chptr, char *topic, time_t ts)
  53 {
  54    struct Client *from;
  55    int newtopic;
  56
  57    if (feature_bool(FEAT_HIS_BANWHO) && IsServer(sptr))
  58        from = &his;
  59    else
  60        from = sptr;
  61    /* Note if this is just a refresh of an old topic, and don't
  62     * send it to all the clients to save bandwidth.  We still send
  63     * it to other servers as they may have split and lost the topic.
  64     */
  65    newtopic=ircd_strncmp(chptr->topic,topic,TOPICLEN)!=0;
  66    /* setting a topic */
  67    ircd_strncpy(chptr->topic, topic, TOPICLEN);
  68    ircd_strncpy(chptr->topic_nick, cli_name(from), NICKLEN);
  69    chptr->topic_time = ts ? ts : TStime();
  70    /* Fixed in 2.10.11: Don't propagate local topics */
  71    if (!IsLocalChannel(chptr->chname))
  72      sendcmdto_serv_butone(sptr, CMD_TOPIC, cptr, "%H %Tu %Tu :%s", chptr,
  73                            chptr->creationtime, chptr->topic_time, chptr->topic);
  74    if (newtopic)
  75      sendcmdto_channel_butserv_butone(from, CMD_TOPIC, chptr, NULL, 0,
  76                                        "%H :%s", chptr, chptr->topic);
  77       /* if this is the same topic as before we send it to the person that
  78        * set it (so they knew it went through ok), but don't bother sending
  79        * it to everyone else on the channel to save bandwidth
  80        */
  81     else if (MyUser(sptr))
  82       sendcmdto_one(sptr, CMD_TOPIC, sptr, "%H :%s", chptr, chptr->topic);
  83 }
  84
  85 /** Handle a local user's attempt to get or set a channel topic.
  86  *
  87  * \a parv has the following elements:
  88  * \li \a parv[1] is the channel name
  89  * \li \a parv[\a parc - 1] is the topic (if \a parc > 2)
  90  *
  91  * See @ref m_functions for discussion of the arguments.
  92  * @param[in] cptr Client that sent us the message.
  93  * @param[in] sptr Original source of message.
  94  * @param[in] parc Number of arguments.
  95  * @param[in] parv Argument vector.
  96  */
  97 int m_topic(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
  98 {
  99   struct Channel *chptr;
 100   char *topic = 0, *name, *p = 0;
 101
 102   if (parc < 2)
 103     return need_more_params(sptr, "TOPIC");
 104
 105   if (parc > 2)
 106     topic = parv[parc - 1];
 107
 108   for (; (name = ircd_strtok(&p, parv[1], ",")); parv[1] = 0)
 109   {
 110     chptr = 0;
 111     /* Does the channel exist */
 112     if (!IsChannelName(name) || !(chptr = FindChannel(name)))
 113     {
 114         send_reply(sptr,ERR_NOSUCHCHANNEL,name);
 115         continue;
 116     }
 117     /* Trying to check a topic outside a secret channel */
 118     if ((topic || SecretChannel(chptr)) && !find_channel_member(sptr, chptr))
 119     {
 120       send_reply(sptr, ERR_NOTONCHANNEL, chptr->chname);
 121       continue;
 122     }
 123
 124     /* only asking for topic */
 125     if (!topic)
 126     {
 127       if (chptr->topic[0] == '\0')
 128         send_reply(sptr, RPL_NOTOPIC, chptr->chname);
 129       else
 130       {
 131         send_reply(sptr, RPL_TOPIC, chptr->chname, chptr->topic);
 132         send_reply(sptr, RPL_TOPICWHOTIME, chptr->chname, chptr->topic_nick,
 133                    chptr->topic_time);
 134       }
 135     }
 136     else if ((chptr->mode.mode & MODE_TOPICLIMIT) && !is_chan_op(sptr, chptr))
 137       send_reply(sptr, ERR_CHANOPRIVSNEEDED, chptr->chname);
 138     else if (!client_can_send_to_channel(sptr, chptr, 1))
 139       send_reply(sptr, ERR_CANNOTSENDTOCHAN, chptr->chname);
 140     else
 141       do_settopic(sptr,cptr,chptr,topic,0);
 142   }
 143   return 0;
 144 }
 145
 146 /** Handle a remote user's attempt to set a channel topic.
 147  * \a parv has the following elements:
 148  * \li \a parv[1] is the channel name
 149  * \li \a parv[2] is the channel creation timestamp (optional)
 150  * \li \a parv[2] is the topic's timestamp (optional)
 151  * \li \a parv[\a parc - 1] is the topic
 152  *
 153  * See @ref m_functions for discussion of the arguments.
 154  * @param[in] cptr Client that sent us the message.
 155  * @param[in] sptr Original source of message.
 156  * @param[in] parc Number of arguments.
 157  * @param[in] parv Argument vector.
 158  */
 159 int ms_topic(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 160 {
 161   struct Channel *chptr;
 162   char *topic = 0, *name, *p = 0;
 163   time_t ts = 0;
 164
 165   if (parc < 3)
 166     return need_more_params(sptr, "TOPIC");
 167
 168   topic = parv[parc - 1];
 169
 170   for (; (name = ircd_strtok(&p, parv[1], ",")); parv[1] = 0)
 171   {
 172     chptr = 0;
 173     /* Does the channel exist */
 174     if (!IsChannelName(name) || !(chptr = FindChannel(name)))
 175     {
 176         send_reply(sptr,ERR_NOSUCHCHANNEL,name);
 177         continue;
 178     }
 179
 180     /* Ignore requests for topics from remote servers */
 181     if (IsLocalChannel(name) && !MyUser(sptr))
 182     {
 183       protocol_violation(sptr,"Topic request");
 184       continue;
 185     }
 186
 187     /* If existing channel is older or has newer topic, ignore */
 188     if (parc > 3 && (ts = atoi(parv[2])) && chptr->creationtime < ts)
 189       continue;
 190
 191     if (parc > 4 && (ts = atoi(parv[3])) && chptr->topic_time > ts)
 192       continue;
 193
 194     do_settopic(sptr,cptr,chptr,topic, ts);
 195   }
 196   return 0;
 197 }