extensions/m_remove.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_kick.c: Kicks a user from a channel.
   4  *
   5  *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
   6  *  Copyright (C) 1996-2002 Hybrid Development Team
   7  *  Copyright (C) 2002-2005 ircd-ratbox development team
   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 2 of the License, or
  12  *  (at your option) 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  22  *  USA
  23  *
  24  *  $Id: m_kick.c 3317 2007-03-28 23:17:06Z jilles $
  25  */
  26
  27 #include "stdinc.h"
  28 #include "channel.h"
  29 #include "client.h"
  30 #include "match.h"
  31 #include "ircd.h"
  32 #include "numeric.h"
  33 #include "send.h"
  34 #include "msg.h"
  35 #include "modules.h"
  36 #include "parse.h"
  37 #include "hash.h"
  38 #include "packet.h"
  39 #include "s_serv.h"
  40 #include "s_conf.h"
  41 #include "hook.h"
  42 #include "messages.h"
  43
  44 unsigned int CAP_REMOVE;
  45
  46 static int m_remove(struct Client *, struct Client *, int, const char **);
  47
  48 struct Message remove_msgtab = {
  49         "REMOVE", 0, 0, 0, MFLG_SLOW,
  50         {mg_unreg, {m_remove, 3}, {m_remove, 3}, {m_remove, 3}, mg_ignore, {m_remove, 3}}
  51 };
  52
  53 mapi_clist_av1 remove_clist[] = { &remove_msgtab, NULL };
  54
  55 static int
  56 modinit(void)
  57 {
  58         CAP_REMOVE = capability_put(serv_capindex, "REMOVE");
  59
  60         return 0;
  61 }
  62
  63 static void
  64 moddeinit(void)
  65 {
  66         capability_orphan(serv_capindex, "REMOVE");
  67 }
  68
  69 DECLARE_MODULE_AV1(remove, modinit, moddeinit, remove_clist, NULL, NULL, "$Revision: 3317 $");
  70
  71 static int
  72 m_remove(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  73 {
  74         struct membership *msptr;
  75         struct Client *who;
  76         struct Channel *chptr;
  77         int chasing = 0;
  78         char *comment;
  79         const char *name;
  80         char *p = NULL;
  81         const char *user;
  82         static char buf[BUFSIZE];
  83
  84         if(MyClient(source_p) && !IsFloodDone(source_p))
  85                 flood_endgrace(source_p);
  86
  87         *buf = '\0';
  88         if((p = strchr(parv[1], ',')))
  89                 *p = '\0';
  90
  91         name = parv[1];
  92
  93         chptr = find_channel(name);
  94         if(chptr == NULL)
  95         {
  96                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
  97                 return 0;
  98         }
  99
 100         if(!IsServer(source_p))
 101         {
 102                 msptr = find_channel_membership(chptr, source_p);
 103
 104                 if((msptr == NULL) && MyConnect(source_p))
 105                 {
 106                         sendto_one_numeric(source_p, ERR_NOTONCHANNEL,
 107                                            form_str(ERR_NOTONCHANNEL), name);
 108                         return 0;
 109                 }
 110
 111                 if(get_channel_access(source_p, msptr) < CHFL_CHANOP)
 112                 {
 113                         if(MyConnect(source_p))
 114                         {
 115                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 116                                            me.name, source_p->name, name);
 117                                 return 0;
 118                         }
 119
 120                         /* If its a TS 0 channel, do it the old way */
 121                         if(chptr->channelts == 0)
 122                         {
 123                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 124                                            get_id(&me, source_p), get_id(source_p, source_p), name);
 125                                 return 0;
 126                         }
 127                 }
 128
 129                 /* Its a user doing a kick, but is not showing as chanop locally
 130                  * its also not a user ON -my- server, and the channel has a TS.
 131                  * There are two cases we can get to this point then...
 132                  *
 133                  *     1) connect burst is happening, and for some reason a legit
 134                  *        op has sent a KICK, but the SJOIN hasn't happened yet or
 135                  *        been seen. (who knows.. due to lag...)
 136                  *
 137                  *     2) The channel is desynced. That can STILL happen with TS
 138                  *
 139                  *     Now, the old code roger wrote, would allow the KICK to
 140                  *     go through. Thats quite legit, but lets weird things like
 141                  *     KICKS by users who appear not to be chanopped happen,
 142                  *     or even neater, they appear not to be on the channel.
 143                  *     This fits every definition of a desync, doesn't it? ;-)
 144                  *     So I will allow the KICK, otherwise, things are MUCH worse.
 145                  *     But I will warn it as a possible desync.
 146                  *
 147                  *     -Dianora
 148                  */
 149         }
 150
 151         if((p = strchr(parv[2], ',')))
 152                 *p = '\0';
 153
 154         user = parv[2];         /* strtoken(&p2, parv[2], ","); */
 155
 156         if(!(who = find_chasing(source_p, user, &chasing)))
 157         {
 158                 return 0;
 159         }
 160
 161         msptr = find_channel_membership(chptr, who);
 162
 163         if(msptr != NULL)
 164         {
 165                 if(MyClient(source_p) && IsService(who))
 166                 {
 167                         sendto_one(source_p, form_str(ERR_ISCHANSERVICE),
 168                                    me.name, source_p->name, who->name, chptr->chname);
 169                         return 0;
 170                 }
 171
 172                 if(MyClient(source_p))
 173                 {
 174                         hook_data_channel_approval hookdata;
 175
 176                         hookdata.client = source_p;
 177                         hookdata.chptr = chptr;
 178                         hookdata.msptr = msptr;
 179                         hookdata.target = who;
 180                         hookdata.approved = 1;
 181
 182                         call_hook(h_can_kick, &hookdata);
 183
 184                         if (!hookdata.approved)
 185                                 return 0;
 186                 }
 187
 188                 comment = LOCAL_COPY((EmptyString(parv[3])) ? who->name : parv[3]);
 189                 if(strlen(comment) > (size_t) REASONLEN)
 190                         comment[REASONLEN] = '\0';
 191
 192                 /* jdc
 193                  * - In the case of a server kicking a user (i.e. CLEARCHAN),
 194                  *   the kick should show up as coming from the server which did
 195                  *   the kick.
 196                  * - Personally, flame and I believe that server kicks shouldn't
 197                  *   be sent anyways.  Just waiting for some oper to abuse it...
 198                  */
 199                 sendto_channel_local(ALL_MEMBERS, chptr,
 200                                      ":%s!%s@%s PART %s :requested by %s (%s)",
 201                                      who->name, who->username,
 202                                      who->host, name, source_p->name, comment);
 203
 204                 sendto_server(client_p, chptr, CAP_REMOVE, NOCAPS,
 205                               ":%s REMOVE %s %s :%s",
 206                               use_id(source_p), chptr->chname, use_id(who), comment);
 207                 sendto_server(client_p, chptr, NOCAPS, CAP_REMOVE,
 208                               ":%s KICK %s %s :%s",
 209                               use_id(source_p), chptr->chname, use_id(who), comment);
 210
 211                 remove_user_from_channel(msptr);
 212         }
 213         else if (MyClient(source_p))
 214                 sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
 215                                    form_str(ERR_USERNOTINCHANNEL), user, name);
 216
 217         return 0;
 218 }
 219