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(!IsChannelName(name))
  83         {
  84                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
  85                                    form_str(ERR_NOSUCHCHANNEL), name);
  86                 return 0;
  87         }
  88
  89         if((chptr = find_channel(name)) == NULL)
  90         {
  91                 sendto_one_numeric(source_p, ERR_NOSUCHCHANNEL,
  92                                    form_str(ERR_NOSUCHCHANNEL), name);
  93                 return 0;
  94         }
  95
  96         if(IsMember(source_p, chptr))
  97         {
  98                 if(MyClient(source_p))
  99                         sendto_one(source_p, form_str(ERR_KNOCKONCHAN),
 100                                    me.name, source_p->name, name);
 101                 return 0;
 102         }
 103
 104         if(!((chptr->mode.mode & MODE_INVITEONLY) || (*chptr->mode.key) ||
 105              (chptr->mode.limit &&
 106               rb_dlink_list_length(&chptr->members) >= (unsigned long)chptr->mode.limit)))
 107         {
 108                 sendto_one_numeric(source_p, ERR_CHANOPEN,
 109                                    form_str(ERR_CHANOPEN), name);
 110                 return 0;
 111         }
 112
 113         /* cant knock to a +p channel */
 114         if(HiddenChannel(chptr))
 115         {
 116                 sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN,
 117                                    form_str(ERR_CANNOTSENDTOCHAN), name);
 118                 return 0;
 119         }
 120
 121
 122         if(MyClient(source_p))
 123         {
 124                 /* don't allow a knock if the user is banned */
 125                 if(is_banned(chptr, source_p, NULL, NULL, NULL) == CHFL_BAN ||
 126                                 is_quieted(chptr, source_p, NULL, NULL, NULL) == CHFL_BAN)
 127                 {
 128                         sendto_one_numeric(source_p, ERR_CANNOTSENDTOCHAN,
 129                                            form_str(ERR_CANNOTSENDTOCHAN), name);
 130                         return 0;
 131                 }
 132
 133                 /* local flood protection:
 134                  * allow one knock per user per knock_delay
 135                  * allow one knock per channel per knock_delay_channel
 136                  */
 137                 if(!IsOper(source_p) &&
 138                    (source_p->localClient->last_knock + ConfigChannel.knock_delay) > rb_current_time())
 139                 {
 140                         sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
 141                                         me.name, source_p->name, name, "user");
 142                         return 0;
 143                 }
 144                 else if((chptr->last_knock + ConfigChannel.knock_delay_channel) > rb_current_time())
 145                 {
 146                         sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
 147                                         me.name, source_p->name, name, "channel");
 148                         return 0;
 149                 }
 150
 151                 /* ok, we actually can send the knock, tell client */
 152                 source_p->localClient->last_knock = rb_current_time();
 153
 154                 sendto_one(source_p, form_str(RPL_KNOCKDLVR),
 155                            me.name, source_p->name, name);
 156         }
 157
 158         chptr->last_knock = rb_current_time();
 159
 160         if(ConfigChannel.use_knock)
 161                 sendto_channel_local(chptr->mode.mode & MODE_FREEINVITE ? ALL_MEMBERS : ONLY_CHANOPS,
 162                                      chptr, form_str(RPL_KNOCK),
 163                                      me.name, name, name, source_p->name,
 164                                      source_p->username, source_p->host);
 165
 166         sendto_server(client_p, chptr, CAP_KNOCK|CAP_TS6, NOCAPS,
 167                       ":%s KNOCK %s", use_id(source_p), name);
 168         sendto_server(client_p, chptr, CAP_KNOCK, CAP_TS6,
 169                       ":%s KNOCK %s", source_p->name, name);
 170         return 0;
 171 }
 172