modules/core/m_kick.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 "hook.h"
  41
  42 static int m_kick(struct Client *, struct Client *, int, const char **);
  43 #define mg_kick { m_kick, 3 }
  44
  45 struct Message kick_msgtab = {
  46         "KICK", 0, 0, 0, MFLG_SLOW,
  47         {mg_unreg, mg_kick, mg_kick, mg_kick, mg_ignore, mg_kick}
  48 };
  49
  50 mapi_clist_av1 kick_clist[] = { &kick_msgtab, NULL };
  51
  52 DECLARE_MODULE_AV1(kick, NULL, NULL, kick_clist, NULL, NULL, "$Revision: 3317 $");
  53
  54 /*
  55 ** m_kick
  56 **      parv[1] = channel
  57 **      parv[2] = client to kick
  58 **      parv[3] = kick comment
  59 */
  60 static int
  61 m_kick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  62 {
  63         struct membership *msptr;
  64         struct Client *who;
  65         struct Channel *chptr;
  66         int chasing = 0;
  67         char *comment;
  68         const char *name;
  69         char *p = NULL;
  70         const char *user;
  71         static char buf[BUFSIZE];
  72
  73         if(MyClient(source_p) && !IsFloodDone(source_p))
  74                 flood_endgrace(source_p);
  75
  76         *buf = '\0';
  77         if((p = strchr(parv[1], ',')))
  78                 *p = '\0';
  79
  80         name = parv[1];
  81
  82         chptr = find_channel(name);
  83         if(chptr == NULL)
  84         {
  85                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
  86                 return 0;
  87         }
  88
  89         user = parv[2];         /* strtoken(&p2, parv[2], ","); */
  90
  91         if(!(who = find_chasing(source_p, user, &chasing)))
  92         {
  93                 return 0;
  94         }
  95
  96         if(!IsServer(source_p))
  97         {
  98                 msptr = find_channel_membership(chptr, source_p);
  99
 100                 if((msptr == NULL) && MyConnect(source_p))
 101                 {
 102                         sendto_one_numeric(source_p, ERR_NOTONCHANNEL,
 103                                            form_str(ERR_NOTONCHANNEL), name);
 104                         return 0;
 105                 }
 106
 107                 if(!can_kick_deop(msptr, find_channel_membership(chptr, who)) && !IsOverride(source_p))
 108                 {
 109                         if(MyConnect(source_p))
 110                         {
 111                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 112                                            me.name, source_p->name, name);
 113                                 return 0;
 114                         }
 115
 116                         /* If its a TS 0 channel, do it the old way */
 117                         if(chptr->channelts == 0)
 118                         {
 119                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 120                                            get_id(&me, source_p), get_id(source_p, source_p), name);
 121                                 return 0;
 122                         }
 123                 }
 124
 125                 /* Its a user doing a kick, but is not showing as chanop locally
 126                  * its also not a user ON -my- server, and the channel has a TS.
 127                  * There are two cases we can get to this point then...
 128                  *
 129                  *     1) connect burst is happening, and for some reason a legit
 130                  *        op has sent a KICK, but the SJOIN hasn't happened yet or
 131                  *        been seen. (who knows.. due to lag...)
 132                  *
 133                  *     2) The channel is desynced. That can STILL happen with TS
 134                  *
 135                  *     Now, the old code roger wrote, would allow the KICK to
 136                  *     go through. Thats quite legit, but lets weird things like
 137                  *     KICKS by users who appear not to be chanopped happen,
 138                  *     or even neater, they appear not to be on the channel.
 139                  *     This fits every definition of a desync, doesn't it? ;-)
 140                  *     So I will allow the KICK, otherwise, things are MUCH worse.
 141                  *     But I will warn it as a possible desync.
 142                  *
 143                  *     -Dianora
 144                  */
 145         }
 146
 147         if((p = strchr(parv[2], ',')))
 148                 *p = '\0';
 149
 150         msptr = find_channel_membership(chptr, who);
 151
 152         if(msptr != NULL)
 153         {
 154                 if(MyClient(source_p) && IsService(who))
 155                 {
 156                         sendto_one(source_p, form_str(ERR_ISCHANSERVICE),
 157                                    me.name, source_p->name, who->name, chptr->chname);
 158                         return 0;
 159                 }
 160
 161                 if(MyClient(source_p) && chptr->mode.mode & MODE_NOKICK)
 162                 {
 163                         sendto_one_numeric(source_p, ERR_NOKICK,
 164                                         form_str(ERR_NOKICK),
 165                                         chptr->chname);
 166                         return 0;
 167                 }
 168
 169                 if(MyClient(source_p))
 170                 {
 171                         hook_data_channel_approval hookdata;
 172
 173                         hookdata.client = source_p;
 174                         hookdata.chptr = chptr;
 175                         hookdata.target = who;
 176                         hookdata.approved = 1;
 177
 178                         call_hook(h_can_kick, &hookdata);
 179
 180                         if (!hookdata.approved)
 181                                 return 0;
 182                 }
 183
 184                 comment = LOCAL_COPY((EmptyString(parv[3])) ? who->name : parv[3]);
 185                 if(strlen(comment) > (size_t) REASONLEN)
 186                         comment[REASONLEN] = '\0';
 187
 188                 /* jdc
 189                  * - In the case of a server kicking a user (i.e. CLEARCHAN),
 190                  *   the kick should show up as coming from the server which did
 191                  *   the kick.
 192                  * - Personally, flame and I believe that server kicks shouldn't
 193                  *   be sent anyways.  Just waiting for some oper to abuse it...
 194                  */
 195                 if(IsServer(source_p))
 196                         sendto_channel_local(ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
 197                                              source_p->name, name, who->name, comment);
 198                 else
 199                         sendto_channel_local(ALL_MEMBERS, chptr,
 200                                              ":%s!%s@%s KICK %s %s :%s",
 201                                              source_p->name, source_p->username,
 202                                              source_p->host, name, who->name, comment);
 203
 204                 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
 205                               ":%s KICK %s %s :%s",
 206                               use_id(source_p), chptr->chname, use_id(who), comment);
 207                 remove_user_from_channel(msptr);
 208         }
 209         else if (MyClient(source_p))
 210                 sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
 211                                    form_str(ERR_USERNOTINCHANNEL), user, name);
 212
 213         return 0;
 214 }