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 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 }