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
  26 #include "stdinc.h"
  27 #include "channel.h"
  28 #include "client.h"
  29 #include "match.h"
  30 #include "ircd.h"
  31 #include "numeric.h"
  32 #include "send.h"
  33 #include "msg.h"
  34 #include "modules.h"
  35 #include "parse.h"
  36 #include "hash.h"
  37 #include "packet.h"
  38 #include "s_serv.h"
  39 #include "s_conf.h"
  40 #include "hook.h"
  41
  42 struct module_modes ModuleModes;
  43
  44 static int m_kick(struct Client *, struct Client *, int, const char **);
  45 #define mg_kick { m_kick, 3 }
  46
  47 struct Message kick_msgtab = {
  48         "KICK", 0, 0, 0, MFLG_SLOW,
  49         {mg_unreg, mg_kick, mg_kick, mg_kick, mg_ignore, mg_kick}
  50 };
  51
  52 mapi_clist_av1 kick_clist[] = { &kick_msgtab, NULL };
  53
  54 DECLARE_MODULE_AV1(kick, NULL, NULL, kick_clist, NULL, NULL, "$Revision: 3317 $");
  55
  56 /*
  57 ** m_kick
  58 **      parv[1] = channel
  59 **      parv[2] = client to kick
  60 **      parv[3] = kick comment
  61 */
  62 static int
  63 m_kick(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  64 {
  65         struct membership *msptr;
  66         struct Client *who;
  67         struct Channel *chptr;
  68         int chasing = 0;
  69         char *comment;
  70         const char *name;
  71         char *p = NULL;
  72         char text[10];
  73         const char *user;
  74         static char buf[BUFSIZE];
  75         int is_override = 0;
  76
  77         if(MyClient(source_p) && !IsFloodDone(source_p))
  78                 flood_endgrace(source_p);
  79
  80         *buf = '\0';
  81         if((p = strchr(parv[1], ',')))
  82                 *p = '\0';
  83
  84         name = parv[1];
  85
  86         chptr = find_channel(name);
  87         if(chptr == NULL)
  88         {
  89                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL, form_str(ERR_NOSUCHCHANNEL), name);
  90                 return 0;
  91         }
  92
  93         user = parv[2];         /* strtoken(&p2, parv[2], ","); */
  94
  95         if(!(who = find_chasing(source_p, user, &chasing)))
  96         {
  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(!can_kick_deop(msptr, find_channel_membership(chptr, who)))
 112                 {
 113                         if(MyConnect(source_p))
 114                         {
 115                                 if(IsOverride(source_p))
 116                                         is_override = 1;
 117                                 else
 118                                 {
 119                                         sendto_one(source_p, ":%s 482 %s %s :You do not have the proper privledges to kick this user",
 120                                                         me.name, source_p->name, name);
 121                                         return 0;
 122                                 }
 123                         }
 124
 125                         /* If its a TS 0 channel, do it the old way */
 126                         else if(chptr->channelts == 0)
 127                         {
 128                                 sendto_one(source_p, form_str(ERR_CHANOPRIVSNEEDED),
 129                                            get_id(&me, source_p), get_id(source_p, source_p), name);
 130                                 return 0;
 131                         }
 132                 }
 133
 134                 /* Its a user doing a kick, but is not showing as chanop locally
 135                  * its also not a user ON -my- server, and the channel has a TS.
 136                  * There are two cases we can get to this point then...
 137                  *
 138                  *     1) connect burst is happening, and for some reason a legit
 139                  *        op has sent a KICK, but the SJOIN hasn't happened yet or
 140                  *        been seen. (who knows.. due to lag...)
 141                  *
 142                  *     2) The channel is desynced. That can STILL happen with TS
 143                  *
 144                  *     Now, the old code roger wrote, would allow the KICK to
 145                  *     go through. Thats quite legit, but lets weird things like
 146                  *     KICKS by users who appear not to be chanopped happen,
 147                  *     or even neater, they appear not to be on the channel.
 148                  *     This fits every definition of a desync, doesn't it? ;-)
 149                  *     So I will allow the KICK, otherwise, things are MUCH worse.
 150                  *     But I will warn it as a possible desync.
 151                  *
 152                  *     -Dianora
 153                  */
 154         }
 155
 156         if((p = strchr(parv[2], ',')))
 157                 *p = '\0';
 158
 159         msptr = find_channel_membership(chptr, who);
 160
 161         if(msptr != NULL)
 162         {
 163                 if(MyClient(source_p) && IsService(who))
 164                 {
 165                         sendto_one(source_p, form_str(ERR_ISCHANSERVICE),
 166                                    me.name, source_p->name, who->name, chptr->chname);
 167                         return 0;
 168                 }
 169
 170                 if(MyClient(source_p) && chptr->mode.mode & ModuleModes.MODE_NOKICK)
 171                 {
 172                         sendto_one_numeric(source_p, ERR_NOKICK,
 173                                         form_str(ERR_NOKICK),
 174                                         chptr->chname);
 175                         return 0;
 176                 }
 177
 178                 if (MyClient(source_p) && chptr->mode.mode & ModuleModes.MODE_NOOPERKICK && IsOper(who))
 179                 {
 180                         sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
 181                                         "Overriding KICK from %s on %s in %s (channel is +M)",
 182                                         source_p->name, who->name, chptr->chname);
 183                         sendto_one_numeric(source_p, ERR_ISCHANSERVICE,
 184                                         "%s %s :Cannot kick IRC operators from that channel.",
 185                                         who->name, chptr->chname);
 186                         return 0;
 187                 }
 188
 189                 if(MyClient(source_p))
 190                 {
 191                         hook_data_channel_approval hookdata;
 192
 193                         hookdata.client = source_p;
 194                         hookdata.chptr = chptr;
 195                         hookdata.target = who;
 196                         hookdata.approved = 1;
 197
 198                         call_hook(h_can_kick, &hookdata);
 199
 200                         if (!hookdata.approved)
 201                                 return 0;
 202                 }
 203
 204                 comment = LOCAL_COPY((EmptyString(parv[3])) ? who->name : parv[3]);
 205                 if(strlen(comment) > (size_t) REASONLEN)
 206                         comment[REASONLEN] = '\0';
 207
 208                 if(is_override)
 209                 {
 210                         sendto_wallops_flags(UMODE_WALLOP, &me,
 211                                         "%s is overriding KICK [%s] on [%s] [%s]",
 212                                         get_oper_name(source_p), who->name, chptr->chname, comment);
 213                         sendto_server(NULL, chptr, NOCAPS, NOCAPS,
 214                                         ":%s WALLOPS :%s is overriding KICK [%s] on [%s] [%s]",
 215                                         me.name, get_oper_name(source_p), who->name, chptr->chname, comment);
 216                 }
 217
 218                 /* jdc
 219                  * - In the case of a server kicking a user (i.e. CLEARCHAN),
 220                  *   the kick should show up as coming from the server which did
 221                  *   the kick.
 222                  * - Personally, flame and I believe that server kicks shouldn't
 223                  *   be sent anyways.  Just waiting for some oper to abuse it...
 224                  */
 225                 if(IsServer(source_p))
 226                         sendto_channel_local(ALL_MEMBERS, chptr, ":%s KICK %s %s :%s",
 227                                              source_p->name, name, who->name, comment);
 228                 else
 229                         sendto_channel_local(ALL_MEMBERS, chptr,
 230                                              ":%s!%s@%s KICK %s %s :%s",
 231                                              source_p->name, source_p->username,
 232                                              source_p->host, name, who->name, comment);
 233
 234                 sendto_server(client_p, chptr, CAP_TS6, NOCAPS,
 235                               ":%s KICK %s %s :%s",
 236                               use_id(source_p), chptr->chname, use_id(who), comment);
 237                 remove_user_from_channel(msptr);
 238
 239                 rb_snprintf(text, sizeof(text), "K%s", who->id);
 240
 241                 /* we don't need to track NOREJOIN stuff unless it's our client being kicked */
 242                 if(MyClient(who) && chptr->mode.mode & ModuleModes.MODE_NOREJOIN)
 243                         channel_metadata_time_add(chptr, text, rb_current_time(), "KICKNOREJOIN");
 244         }
 245         else if (MyClient(source_p))
 246                 sendto_one_numeric(source_p, ERR_USERNOTINCHANNEL,
 247                                    form_str(ERR_USERNOTINCHANNEL), user, name);
 248
 249         return 0;
 250 }