modules/m_knock.c

   1 /*
   2  *  ircd-ratbox: A slightly useful ircd.
   3  *  m_knock.c: Requests to be invited to a channel.
   4  *
   5  *  Copyright (C) 1996-2002 Hybrid Development Team
   6  *  Copyright (C) 2002-2005 ircd-ratbox development team
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
  21  *  USA
  22  *
  23  *  $Id: m_knock.c 3570 2007-09-09 19:19:23Z jilles $
  24  */
  25
  26 #include "stdinc.h"
  27 #include "channel.h"
  28 #include "client.h"
  29 #include "hash.h"
  30 #include "match.h"
  31 #include "ircd.h"
  32 #include "numeric.h"
  33 #include "send.h"
  34 #include "s_conf.h"
  35 #include "msg.h"
  36 #include "parse.h"
  37 #include "modules.h"
  38 #include "s_serv.h"
  39
  40 static int m_knock(struct Client *, struct Client *, int, const char **);
  41
  42 struct Message knock_msgtab = {
  43         "KNOCK", 0, 0, 0, MFLG_SLOW,
  44         {mg_unreg, {m_knock, 2}, {m_knock, 2}, mg_ignore, mg_ignore, {m_knock, 2}}
  45 };
  46
  47 mapi_clist_av1 knock_clist[] = { &knock_msgtab, NULL };
  48 DECLARE_MODULE_AV1(knock, NULL, NULL, knock_clist, NULL, NULL, "$Revision: 3570 $");
  49
  50 /* m_knock
  51  *    parv[1] = channel
  52  *
  53  *  The KNOCK command has the following syntax:
  54  *   :<sender> KNOCK <channel>
  55  *
  56  *  If a user is not banned from the channel they can use the KNOCK
  57  *  command to have the server NOTICE the channel operators notifying
  58  *  they would like to join.  Helpful if the channel is invite-only, the
  59  *  key is forgotten, or the channel is full (INVITE can bypass each one
  60  *  of these conditions.  Concept by Dianora <db@db.net> and written by
  61  *  <anonymous>
  62  */
  63 static int
  64 m_knock(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  65 {
  66         struct Channel *chptr;
  67         char *p, *name;
  68
  69         if(MyClient(source_p) && ConfigChannel.use_knock == 0)
  70         {
  71                 sendto_one(source_p, form_str(ERR_KNOCKDISABLED),
  72                            me.name, source_p->name);
  73                 return 0;
  74         }
  75
  76         name = LOCAL_COPY(parv[1]);
  77
  78         /* dont allow one knock to multiple chans */
  79         if((p = strchr(name, ',')))
  80                 *p = '\0';
  81
  82         if((chptr = find_channel(name)) == NULL)
  83         {
  84                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
  85                                    form_str(ERR_NOSUCHCHANNEL), name);
  86                 return 0;
  87         }
  88
  89         if(IsMember(source_p, chptr))
  90         {
  91                 if(MyClient(source_p))
  92                         sendto_one(source_p, form_str(ERR_KNOCKONCHAN),
  93                                    me.name, source_p->name, name);
  94                 return 0;
  95         }
  96
  97         if(!((chptr->mode.mode & MODE_INVITEONLY) || (*chptr->mode.key) ||
  98              (chptr->mode.limit &&
  99               rb_dlink_list_length(&chptr->members) >= (unsigned long)chptr->mode.limit)))
 100         {
 101                 sendto_one_numeric(source_p, ERR_CHANOPEN,
 102                                    form_str(ERR_CHANOPEN), name);
 103                 return 0;
 104         }
 105
 106         /* cant knock to a +p channel */
 107         if(HiddenChannel(chptr))
 108         {
 109                 sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN,
 110                                    form_str(ERR_CANNOTSENDTOCHAN), name);
 111                 return 0;
 112         }
 113
 114
 115         if(MyClient(source_p))
 116         {
 117                 /* don't allow a knock if the user is banned */
 118                 if(is_banned(chptr, source_p, NULL, NULL, NULL, NULL) == CHFL_BAN ||
 119                         is_quieted(chptr, source_p, NULL, NULL, NULL) == CHFL_BAN)
 120                 {
 121                         sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN,
 122                                            form_str(ERR_CANNOTSENDTOCHAN), name);
 123                         return 0;
 124                 }
 125
 126                 /* local flood protection:
 127                  * allow one knock per user per knock_delay
 128                  * allow one knock per channel per knock_delay_channel
 129                  */
 130                 if(!IsOper(source_p) &&
 131                    (source_p->localClient->last_knock + ConfigChannel.knock_delay) > rb_current_time())
 132                 {
 133                         sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
 134                                         me.name, source_p->name, name, "user");
 135                         return 0;
 136                 }
 137                 else if((chptr->last_knock + ConfigChannel.knock_delay_channel) > rb_current_time())
 138                 {
 139                         sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
 140                                         me.name, source_p->name, name, "channel");
 141                         return 0;
 142                 }
 143
 144                 /* ok, we actually can send the knock, tell client */
 145                 source_p->localClient->last_knock = rb_current_time();
 146
 147                 sendto_one(source_p, form_str(RPL_KNOCKDLVR),
 148                            me.name, source_p->name, name);
 149         }
 150
 151         chptr->last_knock = rb_current_time();
 152
 153         if(ConfigChannel.use_knock)
 154                 sendto_channel_local(chptr->mode.mode & MODE_FREEINVITE ? ALL_MEMBERS : ONLY_CHANOPS,
 155                                      chptr, form_str(RPL_KNOCK),
 156                                      me.name, name, name, source_p->name,
 157                                      source_p->username, source_p->host);
 158
 159         sendto_server(client_p, chptr, CAP_KNOCK|CAP_TS6, NOCAPS,
 160                       ":%s KNOCK %s", use_id(source_p), name);
 161         sendto_server(client_p, chptr, CAP_KNOCK, CAP_TS6,
 162                       ":%s KNOCK %s", source_p->name, name);
 163         return 0;
 164 }
 165