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
  25 #include "stdinc.h"
  26 #include "channel.h"
  27 #include "client.h"
  28 #include "match.h"
  29 #include "ircd.h"
  30 #include "numeric.h"
  31 #include "send.h"
  32 #include "msg.h"
  33 #include "modules.h"
  34 #include "parse.h"
  35 #include "hash.h"
  36 #include "packet.h"
  37 #include "s_serv.h"
  38 #include "hook.h"
  39
  40 static int m_kick(struct MsgBuf *, struct Client *, struct Client *, int, const char **);
  41 #define mg_kick { m_kick, 3 }
  42 static const char kick_desc[] = "Provides the KICK command to remove a user from a channel";
  43
  44 struct Message kick_msgtab = {
  45         "KICK", 0, 0, 0, 0,
  46         {mg_unreg, mg_kick, mg_kick, mg_kick, mg_ignore, mg_kick}
  47 };
  48
  49 mapi_clist_av1 kick_clist[] = { &kick_msgtab, NULL };
  50
  51 DECLARE_MODULE_AV2(kick, NULL, NULL, kick_clist, NULL, NULL, NULL, NULL, kick_desc);
  52
  53 /*
  54 ** m_kick
  55 **      parv[1] = channel
  56 **      parv[2] = client to kick
  57 **      parv[3] = kick comment
  58 */
  59 static int
  60 m_kick(struct MsgBuf *msgbuf_p, struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  61 {
  62         struct membership *msptr;
  63         struct Client *who;
  64         struct Channel *chptr;
  65         int chasing = 0;
  66         char *comment;
  67         const char *name;
  68         char *p = NULL;
  69         const char *user;
  70         static char buf[BUFSIZE];
  71
  72         if(MyClient(source_p) && !IsFloodDone(source_p))
  73                 flood_endgrace(source_p);
  74
  75         *buf = '\0';
  76         if((p = strchr(parv[1], ',')))
  77                 *p = '\0';
  78
  79         name = parv[1];
  80
  81         chptr = find_channel(name);
  82         if(chptr == NULL)
  83         {
  84                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
  85                 return 0;
  86         }
  87
  88         if(!IsServer(source_p))
  89         {
  90                 msptr = find_channel_membership(chptr, source_p);
  91
  92                 if((msptr == NULL) && MyConnect(source_p))
  93                 {
  94                         sendto_one_numeric(source_p, ERR_NOTONCHANNEL,
  95                                            form_str(ERR_NOTONCHANNEL), name);
  96                         return 0;
  97                 }
  98
  99                 if(get_channel_access(source_p, chptr, msptr, MODE_ADD, NULL) < CHFL_CHANOP)
 100                 {
 101                         if(MyConnect(source_p))
 102                         {
 103                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 104                                            me.name, source_p->name, name);
 105                                 return 0;
 106                         }
 107
 108                         /* If its a TS 0 channel, do it the old way */
 109                         if(chptr->channelts == 0)
 110                         {
 111                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 112                                            get_id(&me, source_p), get_id(source_p, source_p), name);
 113                                 return 0;
 114                         }
 115                 }
 116
 117                 /* Its a user doing a kick, but is not showing as chanop locally
 118                  * its also not a user ON -my- server, and the channel has a TS.
 119                  * There are two cases we can get to this point then...
 120                  *
 121                  *     1) connect burst is happening, and for some reason a legit
 122                  *        op has sent a KICK, but the SJOIN hasn't happened yet or
 123                  *        been seen. (who knows.. due to lag...)
 124                  *
 125                  *     2) The channel is desynced. That can STILL happen with TS
 126                  *
 127                  *     Now, the old code roger wrote, would allow the KICK to
 128                  *     go through. Thats quite legit, but lets weird things like
 129                  *     KICKS by users who appear not to be chanopped happen,
 130                  *     or even neater, they appear not to be on the channel.
 131                  *     This fits every definition of a desync, doesn't it? ;-)
 132                  *     So I will allow the KICK, otherwise, things are MUCH worse.
 133                  *     But I will warn it as a possible desync.
 134                  *
 135                  *     -Dianora
 136                  */
 137         }
 138
 139         if((p = strchr(parv[2], ',')))
 140                 *p = '\0';
 141
 142         user = parv[2];         /* strtoken(&p2, parv[2], ","); */
 143
 144         if(!(who = find_chasing(source_p, user, &chasing)))
 145         {
 146                 return 0;
 147         }
 148
 149         msptr = find_channel_membership(chptr, who);
 150
 151         if(msptr != NULL)
 152         {
 153                 if(MyClient(source_p) && IsService(who))
 154                 {
 155                         sendto_one(source_p, form_str(ERR_ISCHANSERVICE),
 156                                    me.name, source_p->name, who->name, chptr->chname);
 157                         return 0;
 158                 }
 159
 160                 if(MyClient(source_p))
 161                 {
 162                         hook_data_channel_approval hookdata;
 163
 164                         hookdata.client = source_p;
 165                         hookdata.chptr = chptr;
 166                         hookdata.msptr = msptr;
 167                         hookdata.target = who;
 168                         hookdata.approved = 1;
 169                         hookdata.dir = MODE_ADD;        /* ensure modules like override speak up */
 170
 171                         call_hook(h_can_kick, &hookdata);
 172
 173                         if (!hookdata.approved)
 174                                 return 0;
 175                 }
 176
 177                 comment = LOCAL_COPY((EmptyString(parv[3])) ? who->name : parv[3]);
 178                 if(strlen(comment) > (size_t) REASONLEN)
 179                         comment[REASONLEN] = '\0';
 180
 181                 /* jdc
 182                  * - In the case of a server kicking a user (i.e. CLEARCHAN),
 183                  *   the kick should show up as coming from the server which did
 184                  *   the kick.
 185                  * - Personally, flame and I believe that server kicks shouldn't
 186                  *   be sent anyways.  Just waiting for some oper to abuse it...
 187                  */
 188                 if(IsServer(source_p))
 189                         sendto_channel_local(ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
 190                                              source_p->name, name, who->name, comment);
 191                 else
 192                         sendto_channel_local(ALL_MEMBERS, chptr,
 193                                              ":%s!%s@%s KICK %s %s :%s",
 194                                              source_p->name, source_p->username,
 195                                              source_p->host, name, who->name, comment);
 196
 197                 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
 198                               ":%s KICK %s %s :%s",
 199                               use_id(source_p), chptr->chname, use_id(who), comment);
 200                 remove_user_from_channel(msptr);
 201         }
 202         else if (MyClient(source_p))
 203                 sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
 204                                    form_str(ERR_USERNOTINCHANNEL), user, name);
 205
 206         return 0;
 207 }