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 "s_conf.h"
  41 #include "hook.h"
  42
  43 static int m_kick(struct Client *, struct Client *, int, const char **);
  44 #define mg_kick { m_kick, 3 }
  45
  46 struct Message kick_msgtab = {
  47         "KICK", 0, 0, 0, MFLG_SLOW,
  48         {mg_unreg, mg_kick, mg_kick, mg_kick, mg_ignore, mg_kick}
  49 };
  50
  51 mapi_clist_av1 kick_clist[] = { &kick_msgtab, NULL };
  52
  53 DECLARE_MODULE_AV1(kick, NULL, NULL, kick_clist, NULL, NULL, "$Revision: 3317 $");
  54
  55 /*
  56 ** m_kick
  57 **      parv[1] = channel
  58 **      parv[2] = client to kick
  59 **      parv[3] = kick comment
  60 */
  61 static int
  62 m_kick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  63 {
  64         struct membership *msptr;
  65         struct Client *who;
  66         struct Channel *chptr;
  67         int chasing = 0;
  68         char *comment;
  69         const char *name;
  70         char *p = NULL;
  71         char *text = rb_strdup("");
  72         const char *user;
  73         static char buf[BUFSIZE];
  74         int is_override = 0;
  75
  76         if(MyClient(source_p) && !IsFloodDone(source_p))
  77                 flood_endgrace(source_p);
  78
  79         *buf = '\0';
  80         if((p = strchr(parv[1], ',')))
  81                 *p = '\0';
  82
  83         name = parv[1];
  84
  85         chptr = find_channel(name);
  86         if(chptr == NULL)
  87         {
  88                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
  89                 return 0;
  90         }
  91
  92         user = parv[2];         /* strtoken(&p2, parv[2], ","); */
  93
  94         if(!(who = find_chasing(source_p, user, &chasing)))
  95         {
  96                 return 0;
  97         }
  98
  99         if(!IsServer(source_p))
 100         {
 101                 msptr = find_channel_membership(chptr, source_p);
 102
 103                 if((msptr == NULL) && MyConnect(source_p))
 104                 {
 105                         sendto_one_numeric(source_p, ERR_NOTONCHANNEL,
 106                                            form_str(ERR_NOTONCHANNEL), name);
 107                         return 0;
 108                 }
 109
 110                 if(!can_kick_deop(msptr, find_channel_membership(chptr, who)))
 111                 {
 112                         if(MyConnect(source_p))
 113                         {
 114                                 if(IsOverride(source_p))
 115                                         is_override = 1;
 116                                 else
 117                                 {
 118                                         sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 119                                                         me.name, source_p->name, name);
 120                                         return 0;
 121                                 }
 122                         }
 123
 124                         /* If its a TS 0 channel, do it the old way */
 125                         else if(chptr->channelts == 0)
 126                         {
 127                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 128                                            get_id(&me, source_p), get_id(source_p, source_p), name);
 129                                 return 0;
 130                         }
 131                 }
 132
 133                 /* Its a user doing a kick, but is not showing as chanop locally
 134                  * its also not a user ON -my- server, and the channel has a TS.
 135                  * There are two cases we can get to this point then...
 136                  *
 137                  *     1) connect burst is happening, and for some reason a legit
 138                  *        op has sent a KICK, but the SJOIN hasn't happened yet or
 139                  *        been seen. (who knows.. due to lag...)
 140                  *
 141                  *     2) The channel is desynced. That can STILL happen with TS
 142                  *
 143                  *     Now, the old code roger wrote, would allow the KICK to
 144                  *     go through. Thats quite legit, but lets weird things like
 145                  *     KICKS by users who appear not to be chanopped happen,
 146                  *     or even neater, they appear not to be on the channel.
 147                  *     This fits every definition of a desync, doesn't it? ;-)
 148                  *     So I will allow the KICK, otherwise, things are MUCH worse.
 149                  *     But I will warn it as a possible desync.
 150                  *
 151                  *     -Dianora
 152                  */
 153         }
 154
 155         if((p = strchr(parv[2], ',')))
 156                 *p = '\0';
 157
 158         msptr = find_channel_membership(chptr, who);
 159
 160         if(msptr != NULL)
 161         {
 162                 if(MyClient(source_p) && IsService(who))
 163                 {
 164                         sendto_one(source_p, form_str(ERR_ISCHANSERVICE),
 165                                    me.name, source_p->name, who->name, chptr->chname);
 166                         return 0;
 167                 }
 168
 169                 if(MyClient(source_p) && chptr->mode.mode & MODE_NOKICK)
 170                 {
 171                         sendto_one_numeric(source_p, ERR_NOKICK,
 172                                         form_str(ERR_NOKICK),
 173                                         chptr->chname);
 174                         return 0;
 175                 }
 176
 177                 if (MyClient(source_p) && chptr->mode.mode & MODE_NOOPERKICK && IsOper(who))
 178                 {
 179                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 180                                         "Overriding KICK from %s on %s in %s (channel is +M)",
 181                                         source_p->name, who->name, chptr->chname);
 182                         sendto_one_numeric(source_p, ERR_ISCHANSERVICE,
 183                                         "%s %s :Cannot kick IRC operators from that channel.",
 184                                         who->name, chptr->chname);
 185                         return 0;
 186                 }
 187
 188                 if(MyClient(source_p))
 189                 {
 190                         hook_data_channel_approval hookdata;
 191
 192                         hookdata.client = source_p;
 193                         hookdata.chptr = chptr;
 194                         hookdata.target = who;
 195                         hookdata.approved = 1;
 196
 197                         call_hook(h_can_kick, &hookdata);
 198
 199                         if (!hookdata.approved)
 200                                 return 0;
 201                 }
 202
 203                 comment = LOCAL_COPY((EmptyString(parv[3])) ? who->name : parv[3]);
 204                 if(strlen(comment) > (size_t) REASONLEN)
 205                         comment[REASONLEN] = '\0';
 206
 207                 if(is_override)
 208                 {
 209                         sendto_wallops_flags(UMODE_WALLOP, &me,
 210                                         "%s is overriding KICK [%s] on [%s] [%s]",
 211                                         get_oper_name(source_p), who->name, chptr->chname, comment);
 212                         sendto_server(NULL, chptr, NOCAPS, NOCAPS,
 213                                         ":%s WALLOPS :%s is overriding KICK [%s] on [%s] [%s]",
 214                                         me.name, get_oper_name(source_p), who->name, chptr->chname, comment);
 215                 }
 216
 217                 /* jdc
 218                  * - In the case of a server kicking a user (i.e. CLEARCHAN),
 219                  *   the kick should show up as coming from the server which did
 220                  *   the kick.
 221                  * - Personally, flame and I believe that server kicks shouldn't
 222                  *   be sent anyways.  Just waiting for some oper to abuse it...
 223                  */
 224                 if(IsServer(source_p))
 225                         sendto_channel_local(ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
 226                                              source_p->name, name, who->name, comment);
 227                 else
 228                         sendto_channel_local(ALL_MEMBERS, chptr,
 229                                              ":%s!%s@%s KICK %s %s :%s",
 230                                              source_p->name, source_p->username,
 231                                              source_p->host, name, who->name, comment);
 232
 233                 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
 234                               ":%s KICK %s %s :%s",
 235                               use_id(source_p), chptr->chname, use_id(who), comment);
 236                 remove_user_from_channel(msptr);
 237
 238                 rb_sprintf(text, "K%s", who->id);
 239
 240                 /* we don't need to track NOREJOIN stuff unless it's our client being kicked */
 241                 if(MyClient(who) && chptr->mode.mode & MODE_NOREJOIN)
 242                         channel_metadata_time_add(chptr, text, rb_current_time(), "KICKNOREJOIN");
 243         }
 244         else if (MyClient(source_p))
 245                 sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
 246                                    form_str(ERR_USERNOTINCHANNEL), user, name);
 247
 248         return 0;
 249 }