ircd/m_mode.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_mode.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_mode.c,v 1.15.2.1 2005/10/31 23:16:56 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 "handlers.h"
  85 #include "channel.h"
  86 #include "client.h"
  87 #include "hash.h"
  88 #include "ircd.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 "s_conf.h"
  96 #include "s_debug.h"
  97 #include "s_user.h"
  98 #include "send.h"
  99
 100 /* #include <assert.h> -- Now using assert in ircd_log.h */
 101 #include <stdlib.h>
 102 #include <string.h>
 103
 104 int
 105 m_mode(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
 106 {
 107   struct Channel *chptr = 0;
 108   struct ModeBuf mbuf;
 109   struct Membership *member;
 110
 111   if (parc < 2)
 112     return need_more_params(sptr, "MODE");
 113
 114   if (!IsChannelName(parv[1]) || !(chptr = FindChannel(parv[1])))
 115     return set_user_mode(cptr, sptr, parc, parv);
 116
 117   ClrFlag(sptr, FLAG_TS8);
 118
 119   member = find_member_link(chptr, sptr);
 120
 121   if (parc < 3) {
 122     char modebuf[MODEBUFLEN];
 123     char parabuf[MODEBUFLEN];
 124
 125     *modebuf = *parabuf = '\0';
 126     modebuf[1] = '\0';
 127     channel_modes(sptr, modebuf, parabuf, sizeof(parabuf), chptr, member);
 128     send_reply(sptr, RPL_CHANNELMODEIS, chptr->chname, modebuf, parabuf);
 129     send_reply(sptr, RPL_CREATIONTIME, chptr->chname, chptr->creationtime);
 130     return 0;
 131   }
 132
 133   if (!member || !IsChanOp(member)) {
 134     if (IsLocalChannel(chptr->chname) && HasPriv(sptr, PRIV_MODE_LCHAN)) {
 135       modebuf_init(&mbuf, sptr, cptr, chptr,
 136                    (MODEBUF_DEST_CHANNEL | /* Send mode to channel */
 137                     MODEBUF_DEST_HACK4));  /* Send HACK(4) notice */
 138       mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
 139                  (MODE_PARSE_SET |    /* Set the mode */
 140                   MODE_PARSE_FORCE),  /* Force it to take */
 141                   member);
 142       return modebuf_flush(&mbuf);
 143     } else
 144       mode_parse(0, cptr, sptr, chptr, parc - 2, parv + 2,
 145                  (member ? MODE_PARSE_NOTOPER : MODE_PARSE_NOTMEMBER), member);
 146     return 0;
 147   }
 148
 149   modebuf_init(&mbuf, sptr, cptr, chptr,
 150                (MODEBUF_DEST_CHANNEL | /* Send mode to channel */
 151                 MODEBUF_DEST_SERVER)); /* Send mode to servers */
 152   mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2, MODE_PARSE_SET, member);
 153   return modebuf_flush(&mbuf);
 154 }
 155
 156 int
 157 ms_mode(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
 158 {
 159   struct Channel *chptr = 0;
 160   struct ModeBuf mbuf;
 161   struct Membership *member;
 162
 163   if (parc < 3)
 164     return need_more_params(sptr, "MODE");
 165
 166   if (IsLocalChannel(parv[1]))
 167     return 0;
 168
 169   if (!(chptr = FindChannel(parv[1])))
 170     return set_user_mode(cptr, sptr, parc, parv);
 171
 172   ClrFlag(sptr, FLAG_TS8);
 173
 174   if (IsServer(sptr)) {
 175     if (find_conf_byhost(cli_confs(cptr), cli_name(sptr), CONF_UWORLD))
 176       modebuf_init(&mbuf, sptr, cptr, chptr,
 177                    (MODEBUF_DEST_CHANNEL | /* Send mode to clients */
 178                     MODEBUF_DEST_SERVER  | /* Send mode to servers */
 179                     MODEBUF_DEST_HACK4));  /* Send a HACK(4) message */
 180     else
 181       /* Servers need to be able to op people who join using the Apass
 182        * or upass, as well as people joining a zannel, therefore we no
 183        * longer generate HACK3. */
 184       modebuf_init(&mbuf, sptr, cptr, chptr,
 185                    (MODEBUF_DEST_CHANNEL | /* Send mode to clients */
 186                     MODEBUF_DEST_SERVER));   /* Send mode to servers */
 187
 188     mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
 189                (MODE_PARSE_SET    | /* Set the mode */
 190                 MODE_PARSE_STRICT | /* Interpret it strictly */
 191                 MODE_PARSE_FORCE),  /* And force it to be accepted */
 192                 NULL);
 193   } else {
 194     if (!(member = find_member_link(chptr, sptr))
 195         /* Allow people to op themselves on an empty channel. */
 196         || (!IsChanOp(member) && chptr->users > 1)) {
 197       modebuf_init(&mbuf, sptr, cptr, chptr,
 198                    (MODEBUF_DEST_SERVER |  /* Send mode to server */
 199                     MODEBUF_DEST_HACK2  |  /* Send a HACK(2) message */
 200                     MODEBUF_DEST_DEOP   |  /* Deop the source */
 201                     MODEBUF_DEST_BOUNCE)); /* And bounce the MODE */
 202       mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
 203                  (MODE_PARSE_STRICT |  /* Interpret it strictly */
 204                   MODE_PARSE_BOUNCE),  /* And bounce the MODE */
 205                   member);
 206     } else {
 207       modebuf_init(&mbuf, sptr, cptr, chptr,
 208                    (MODEBUF_DEST_CHANNEL | /* Send mode to clients */
 209                     MODEBUF_DEST_SERVER)); /* Send mode to servers */
 210       mode_parse(&mbuf, cptr, sptr, chptr, parc - 2, parv + 2,
 211                  (MODE_PARSE_SET    | /* Set the mode */
 212                   MODE_PARSE_STRICT | /* Interpret it strictly */
 213                   MODE_PARSE_FORCE),  /* And force it to be accepted */
 214                   member);
 215     }
 216   }
 217
 218   return modebuf_flush(&mbuf);
 219 }