ircd/m_kick.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_kick.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_kick.c,v 1.19.2.1 2005/10/01 21:10:34 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 "msg.h"
  92 #include "numeric.h"
  93 #include "numnicks.h"
  94 #include "send.h"
  95 #include "ircd_features.h"
  96
  97 /* #include <assert.h> -- Now using assert in ircd_log.h */
  98
  99 /*
 100  * m_kick - generic message handler
 101  *
 102  * parv[0] = sender prefix
 103  * parv[1] = channel
 104  * parv[2] = client to kick
 105  * parv[parc-1] = kick comment
 106  */
 107 int m_kick(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
 108 {
 109   struct Client *who;
 110   struct Channel *chptr;
 111   struct Membership *member = 0;
 112   struct Membership* member2;
 113   char *name, *comment;
 114
 115   ClrFlag(sptr, FLAG_TS8);
 116
 117   if (parc < 3 || *parv[1] == '\0')
 118     return need_more_params(sptr, "KICK");
 119
 120   name = parv[1];
 121
 122   /* simple checks */
 123   if (!(chptr = get_channel(sptr, name, CGT_NO_CREATE)))
 124     return send_reply(sptr, ERR_NOSUCHCHANNEL, name);
 125
 126   if (!(member2 = find_member_link(chptr, sptr)) || IsZombie(member2)
 127       || !IsChanOp(member2))
 128     return send_reply(sptr, ERR_CHANOPRIVSNEEDED, name);
 129
 130   if (!(who = find_chasing(sptr, parv[2], 0)))
 131     return 0; /* find_chasing sends the reply for us */
 132
 133   /* Don't allow the channel service to be kicked */
 134   /*
 135    * ASUKA_X:
 136    * Allow +X'ed users to kick +k'ed, but not U-lined services.
 137    * --Bigfoot
 138    */
 139   if (IsChannelService(who) && IsService(cli_user(who)->server))
 140     return send_reply(sptr, ERR_ISREALSERVICE, cli_name(who), chptr->chname);
 141
 142   if (IsChannelService(who) && !IsXtraOp(sptr) && (who!=sptr))
 143     return send_reply(sptr, ERR_ISCHANSERVICE, cli_name(who), chptr->chname);
 144
 145   /* Prevent kicking opers from local channels -DM- */
 146   if (IsLocalChannel(chptr->chname) && HasPriv(who, PRIV_DEOP_LCHAN))
 147     return send_reply(sptr, ERR_ISOPERLCHAN, cli_name(who), chptr->chname);
 148
 149   /* check if kicked user is actually on the channel */
 150   if (!(member = find_member_link(chptr, who)) || IsZombie(member))
 151     return send_reply(sptr, ERR_USERNOTINCHANNEL, cli_name(who), chptr->chname);
 152
 153   /* Don't allow to kick member with a higher or equal op-level */
 154   if (chptr->mode.apass[0] && OpLevel(member) <= OpLevel(member2))
 155     return send_reply(sptr, ERR_NOTLOWEROPLEVEL, cli_name(who), chptr->chname,
 156         OpLevel(member2), OpLevel(member), "kick",
 157         OpLevel(member) == OpLevel(member2) ? "the same" : "a higher");
 158
 159   /* We rely on ircd_snprintf to truncate the comment */
 160   comment = EmptyString(parv[parc - 1]) ? parv[0] : parv[parc - 1];
 161
 162   if (!IsLocalChannel(name))
 163     sendcmdto_serv_butone(sptr, CMD_KICK, cptr, "%H %C :%s", chptr, who,
 164                           comment);
 165
 166   if (IsDelayedJoin(member)) {
 167     /* If it's a delayed join, only send the KICK to the person doing
 168      * the kicking and the victim */
 169     if (MyUser(who))
 170       sendcmdto_one(sptr, CMD_KICK, who, "%H %C :%s", chptr, who, comment);
 171     sendcmdto_one(who, CMD_JOIN, sptr, "%H", chptr);
 172     sendcmdto_one(sptr, CMD_KICK, sptr, "%H %C :%s", chptr, who, comment);
 173     CheckDelayedJoins(chptr);
 174   } else
 175     sendcmdto_channel_butserv_butone((IsServer(sptr) ? &me : sptr), CMD_KICK, chptr, NULL, 0, "%H %C :%s", chptr, who,
 176                                      comment);
 177
 178   make_zombie(member, who, cptr, sptr, chptr);
 179
 180   return 0;
 181 }
 182
 183 /*
 184  * ms_kick - server message handler
 185  *
 186  * parv[0] = sender prefix
 187  * parv[1] = channel
 188  * parv[2] = client to kick
 189  * parv[parc-1] = kick comment
 190  */
 191 int ms_kick(struct Client *cptr, struct Client *sptr, int parc, char *parv[])
 192 {
 193   struct Client *who;
 194   struct Channel *chptr;
 195   struct Membership *member = 0, *sptr_link = 0;
 196   char *name, *comment;
 197
 198   ClrFlag(sptr, FLAG_TS8);
 199
 200   if (parc < 3 || *parv[1] == '\0')
 201     return need_more_params(sptr, "KICK");
 202
 203   name = parv[1];
 204   comment = parv[parc - 1];
 205
 206   /* figure out who gets kicked from what */
 207   if (IsLocalChannel(name) ||
 208       !(chptr = get_channel(sptr, name, CGT_NO_CREATE)) ||
 209       !(who = findNUser(parv[2])))
 210     return 0;
 211
 212   /* We go ahead and pass on the KICK for users not on the channel */
 213   if (!(member = find_member_link(chptr, who)) || IsZombie(member))
 214     member = 0;
 215
 216   /* Send HACK notice, but not for servers in BURST */
 217   /* 2002-10-17: Don't send HACK if the users local server is kicking them */
 218   if (IsServer(sptr) &&
 219       !IsBurstOrBurstAck(sptr) &&
 220       sptr!=cli_from(who))
 221     sendto_opmask_butone(0, SNO_HACK4, "HACK: %C KICK %H %C %s", sptr, chptr,
 222                          who, comment);
 223
 224   /* Unless someone accepted it downstream (or the user isn't on the channel
 225    * here), if kicker is not on channel, or if kicker is not a channel
 226    * operator, bounce the kick
 227    */
 228   if (!IsServer(sptr) && member && cli_from(who) != cptr &&
 229       (!(sptr_link = find_member_link(chptr, sptr)) || !IsChanOp(sptr_link))) {
 230     sendto_opmask_butone(0, SNO_HACK2, "HACK: %C KICK %H %C %s", sptr, chptr,
 231                          who, comment);
 232
 233     sendcmdto_one(who, CMD_JOIN, cptr, "%H", chptr);
 234
 235     /* Reop/revoice member */
 236     if (IsChanOp(member) || HasVoice(member)) {
 237       struct ModeBuf mbuf;
 238
 239       modebuf_init(&mbuf, sptr, cptr, chptr,
 240                    (MODEBUF_DEST_SERVER |  /* Send mode to a server */
 241                     MODEBUF_DEST_DEOP   |  /* Deop the source */
 242                     MODEBUF_DEST_BOUNCE)); /* And bounce the MODE */
 243
 244       if (IsChanOp(member))
 245         modebuf_mode_client(&mbuf, MODE_DEL | MODE_CHANOP, who, OpLevel(member));
 246       if (HasVoice(member))
 247         modebuf_mode_client(&mbuf, MODE_DEL | MODE_VOICE, who, MAXOPLEVEL + 1);
 248
 249       modebuf_flush(&mbuf);
 250     }
 251   } else {
 252     /* Propagate kick... */
 253     sendcmdto_serv_butone(sptr, CMD_KICK, cptr, "%H %C :%s", chptr, who,
 254                           comment);
 255
 256     if (member) { /* and tell the channel about it */
 257       if (IsDelayedJoin(member)) {
 258         if (MyUser(who))
 259           sendcmdto_one(IsServer(sptr) ? &his : sptr, CMD_KICK,
 260                         who, "%h %C :%s", chptr, who, comment);
 261       } else {
 262         sendcmdto_channel_butserv_butone(IsServer(sptr) ? &his : sptr, CMD_KICK,
 263                                          chptr, NULL, 0, "%H %C :%s", chptr, who,
 264                                          comment);
 265       }
 266
 267       make_zombie(member, who, cptr, sptr, chptr);
 268     }
 269   }
 270
 271   return 0;
 272 }