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  */
  24
  25 #include "stdinc.h"
  26 #include "channel.h"
  27 #include "client.h"
  28 #include "hash.h"
  29 #include "match.h"
  30 #include "ircd.h"
  31 #include "numeric.h"
  32 #include "send.h"
  33 #include "s_conf.h"
  34 #include "msg.h"
  35 #include "parse.h"
  36 #include "modules.h"
  37 #include "s_serv.h"
  38
  39 static int m_knock(struct Client *, struct Client *, int, const char **);
  40
  41 struct Message knock_msgtab = {
  42         "KNOCK", 0, 0, 0, MFLG_SLOW,
  43         {mg_unreg, {m_knock, 2}, {m_knock, 2}, mg_ignore, mg_ignore, {m_knock, 2}}
  44 };
  45
  46 mapi_clist_av1 knock_clist[] = { &knock_msgtab, NULL };
  47 DECLARE_MODULE_AV1(knock, NULL, NULL, knock_clist, NULL, NULL, "$Revision: 3570 $");
  48
  49 /* m_knock
  50  *    parv[1] = channel
  51  *
  52  *  The KNOCK command has the following syntax:
  53  *   :<sender> KNOCK <channel>
  54  *
  55  *  If a user is not banned from the channel they can use the KNOCK
  56  *  command to have the server NOTICE the channel operators notifying
  57  *  they would like to join.  Helpful if the channel is invite-only, the
  58  *  key is forgotten, or the channel is full (INVITE can bypass each one
  59  *  of these conditions.  Concept by Dianora <db@db.net> and written by
  60  *  <anonymous>
  61  */
  62 static int
  63 m_knock(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
  64 {
  65         struct Channel *chptr;
  66         char *p, *name;
  67
  68         if(MyClient(source_p) && ConfigChannel.use_knock == 0)
  69         {
  70                 sendto_one(source_p, form_str(ERR_KNOCKDISABLED),
  71                            me.name, source_p->name);
  72                 return 0;
  73         }
  74
  75         name = LOCAL_COPY(parv[1]);
  76
  77         /* dont allow one knock to multiple chans */
  78         if((p = strchr(name, ',')))
  79                 *p = '\0';
  80
  81         if(!IsChannelName(name))
  82         {
  83                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
  84                                    form_str(ERR_NOSUCHCHANNEL), name);
  85                 return 0;
  86         }
  87
  88         if((chptr = find_channel(name)) == NULL)
  89         {
  90                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
  91                                    form_str(ERR_NOSUCHCHANNEL), name);
  92                 return 0;
  93         }
  94
  95         if(IsMember(source_p, chptr))
  96         {
  97                 if(MyClient(source_p))
  98                         sendto_one(source_p, form_str(ERR_KNOCKONCHAN),
  99                                    me.name, source_p->name, name);
 100                 return 0;
 101         }
 102
 103         if(!((chptr->mode.mode & MODE_INVITEONLY) || (*chptr->mode.key) ||
 104              (chptr->mode.limit &&
 105               rb_dlink_list_length(&chptr->members) >= (unsigned long)chptr->mode.limit)))
 106         {
 107                 sendto_one_numeric(source_p, ERR_CHANOPEN,
 108                                    form_str(ERR_CHANOPEN), name);
 109                 return 0;
 110         }
 111
 112         /* cant knock to a +p channel */
 113         if(HiddenChannel(chptr))
 114         {
 115                 sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN,
 116                                    form_str(ERR_CANNOTSENDTOCHAN), name);
 117                 return 0;
 118         }
 119
 120
 121         if(MyClient(source_p))
 122         {
 123                 /* don't allow a knock if the user is banned */
 124                 if(is_banned(chptr, source_p, NULL, NULL, NULL) == CHFL_BAN ||
 125                                 is_quieted(chptr, source_p, NULL, NULL, NULL) == CHFL_BAN)
 126                 {
 127                         sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN,
 128                                            form_str(ERR_CANNOTSENDTOCHAN), name);
 129                         return 0;
 130                 }
 131
 132                 /* local flood protection:
 133                  * allow one knock per user per knock_delay
 134                  * allow one knock per channel per knock_delay_channel
 135                  */
 136                 if(!IsOper(source_p) &&
 137                    (source_p->localClient->last_knock + ConfigChannel.knock_delay) > rb_current_time())
 138                 {
 139                         sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
 140                                         me.name, source_p->name, name, "user");
 141                         return 0;
 142                 }
 143                 else if((chptr->last_knock + ConfigChannel.knock_delay_channel) > rb_current_time())
 144                 {
 145                         sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
 146                                         me.name, source_p->name, name, "channel");
 147                         return 0;
 148                 }
 149
 150                 /* ok, we actually can send the knock, tell client */
 151                 source_p->localClient->last_knock = rb_current_time();
 152
 153                 sendto_one(source_p, form_str(RPL_KNOCKDLVR),
 154                            me.name, source_p->name, name);
 155         }
 156
 157         chptr->last_knock = rb_current_time();
 158
 159         if(ConfigChannel.use_knock)
 160                 sendto_channel_local(chptr->mode.mode & MODE_FREEINVITE ? ALL_MEMBERS : ONLY_CHANOPS,
 161                                      chptr, form_str(RPL_KNOCK),
 162                                      me.name, name, name, source_p->name,
 163                                      source_p->username, source_p->host);
 164
 165         sendto_server(client_p, chptr, CAP_KNOCK|CAP_TS6, NOCAPS,
 166                       ":%s KNOCK %s", use_id(source_p), name);
 167         sendto_server(client_p, chptr, CAP_KNOCK, CAP_TS6,
 168                       ":%s KNOCK %s", source_p->name, name);
 169         return 0;
 170 }
 171