ircd/m_part.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_part.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_part.c,v 1.10 2005/03/30 04:01:17 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_log.h"
  89 #include "ircd_reply.h"
  90 #include "ircd_string.h"
  91 #include "numeric.h"
  92 #include "numnicks.h"
  93 #include "send.h"
  94
  95 /* #include <assert.h> -- Now using assert in ircd_log.h */
  96 #include <string.h>
  97
  98 /*
  99  * m_part - generic message handler
 100  *
 101  * parv[0] = sender prefix
 102  * parv[1] = channel
 103  * parv[parc - 1] = comment
 104  */
 105 int m_part(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 106 {
 107   struct Channel *chptr;
 108   struct Membership *member;
 109   struct JoinBuf parts;
 110   unsigned int flags = 0;
 111   char *p = 0;
 112   char *name;
 113
 114   ClrFlag(sptr, FLAG_TS8);
 115
 116   /* check number of arguments */
 117   if (parc < 2 || parv[1][0] == '\0')
 118     return need_more_params(sptr, "PART");
 119
 120   /* init join/part buffer */
 121   joinbuf_init(&parts, sptr, cptr, JOINBUF_TYPE_PART,
 122                (parc > 2 && !EmptyString(parv[parc - 1])) ? parv[parc - 1] : 0,
 123                0);
 124
 125   /* scan through channel list */
 126   for (name = ircd_strtok(&p, parv[1], ","); name;
 127        name = ircd_strtok(&p, 0, ",")) {
 128
 129     chptr = get_channel(sptr, name, CGT_NO_CREATE); /* look up channel */
 130
 131     if (!chptr) { /* complain if there isn't such a channel */
 132       send_reply(sptr, ERR_NOSUCHCHANNEL, name);
 133       continue;
 134     }
 135
 136     if (!(member = find_member_link(chptr, sptr))) { /* complain if not on */
 137       send_reply(sptr, ERR_NOTONCHANNEL, chptr->chname);
 138       continue;
 139     }
 140
 141     assert(!IsZombie(member)); /* Local users should never zombie */
 142
 143     if (!member_can_send_to_channel(member, 0))
 144     {
 145       flags |= CHFL_BANNED;
 146       /* Remote clients don't want to see a comment either. */
 147       parts.jb_comment = 0;
 148     }
 149
 150     if (IsDelayedJoin(member))
 151       flags |= CHFL_DELAYED;
 152
 153     joinbuf_join(&parts, chptr, flags); /* part client from channel */
 154   }
 155
 156   return joinbuf_flush(&parts); /* flush channel parts */
 157 }
 158
 159 /*
 160  * ms_part - server message handler
 161  *
 162  * parv[0] = sender prefix
 163  * parv[1] = channel
 164  * parv[parc - 1] = comment
 165  */
 166 int ms_part(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 167 {
 168   struct Channel *chptr;
 169   struct Membership *member;
 170   struct JoinBuf parts;
 171   unsigned int flags;
 172   char *p = 0;
 173   char *name;
 174
 175   ClrFlag(sptr, FLAG_TS8);
 176
 177   /* check number of arguments */
 178   if (parc < 2 || parv[1][0] == '\0')
 179     return need_more_params(sptr, "PART");
 180
 181   /* init join/part buffer */
 182   joinbuf_init(&parts, sptr, cptr, JOINBUF_TYPE_PART,
 183                (parc > 2 && !EmptyString(parv[parc - 1])) ? parv[parc - 1] : 0,
 184                0);
 185
 186   /* scan through channel list */
 187   for (name = ircd_strtok(&p, parv[1], ","); name;
 188        name = ircd_strtok(&p, 0, ",")) {
 189
 190     flags = 0;
 191
 192     chptr = get_channel(sptr, name, CGT_NO_CREATE); /* look up channel */
 193
 194     if (!chptr || IsLocalChannel(name) ||
 195         !(member = find_member_link(chptr, sptr)))
 196       continue; /* ignore from remote clients */
 197
 198     if (IsZombie(member)) /* figure out special flags... */
 199       flags |= CHFL_ZOMBIE;
 200
 201     if (IsDelayedJoin(member))
 202       flags |= CHFL_DELAYED;
 203
 204     /* part user from channel */
 205     joinbuf_join(&parts, chptr, flags);
 206   }
 207
 208   return joinbuf_flush(&parts); /* flush channel parts */
 209 }