trunk/modules/m_knock.c

/*
 *  ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
 *
 *  Copyright (c) 1998-2014 ircd-hybrid development team
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
 *  USA
 */

/*! \file m_knock.c
 * \brief Includes required functions for processing the KNOCK command.
 * \version $Id$
 */

#include "stdinc.h"
#include "list.h"
#include "channel.h"
#include "channel_mode.h"
#include "client.h"
#include "hash.h"
#include "irc_string.h"
#include "ircd.h"
#include "numeric.h"
#include "send.h"
#include "conf.h"
#include "parse.h"
#include "modules.h"
#include "s_serv.h"
#include "s_user.h"


/* m_knock
 *    parv[0] = command
 *    parv[1] = channel
 *
 *  The KNOCK command has the following syntax:
 *   :<sender> KNOCK <channel>
 *
 *  If a user is not banned from the channel they can use the KNOCK
 *  command to have the server NOTICE the channel operators notifying
 *  they would like to join.  Helpful if the channel is invite-only, the
 *  key is forgotten, or the channel is full (INVITE can bypass each one
 *  of these conditions.  Concept by Dianora <db@db.net> and written by
 *  <anonymous>
 */
static int
m_knock(struct Client *client_p, struct Client *source_p,
        int parc, char *parv[])
{
  struct Channel *chptr = NULL;

  if (EmptyString(parv[1]))
  {
    sendto_one_numeric(source_p, &me, ERR_NEEDMOREPARAMS, "KNOCK");
    return 0;
  }

  if ((chptr = hash_find_channel(parv[1])) == NULL)
  {
    sendto_one_numeric(source_p, &me, ERR_NOSUCHCHANNEL, parv[1]);
    return 0;
  }

  /* Normal channel, just be sure they aren't on it */
  if (IsMember(source_p, chptr))
  {
    sendto_one_numeric(source_p, &me, ERR_KNOCKONCHAN, chptr->chname);
    return 0;
  }

  if (!((chptr->mode.mode & MODE_INVITEONLY) || (*chptr->mode.key) ||
        (chptr->mode.limit && dlink_list_length(&chptr->members) >=
         chptr->mode.limit)))
  {
    sendto_one_numeric(source_p, &me, ERR_CHANOPEN, chptr->chname);
    return 0;
  }

  if (MyClient(source_p))
  {
    /*
     * Don't allow a knock if the user is banned, or the channel is private
     */
    if (PrivateChannel(chptr) || is_banned(chptr, source_p))
    {
      sendto_one_numeric(source_p, &me, ERR_CANNOTSENDTOCHAN, chptr->chname);
      return 0;
    }

    /*
     * flood protection:
     * allow one knock per user per knock_delay
     * allow one knock per channel per knock_delay_channel
     *
     * we only limit local requests..
     */
    if ((source_p->localClient->last_knock + ConfigChannel.knock_delay) >
        CurrentTime)
    {
      sendto_one_numeric(source_p, &me, ERR_TOOMANYKNOCK, chptr->chname, "user");
      return 0;
    }

    if ((chptr->last_knock + ConfigChannel.knock_delay_channel) > CurrentTime)
    {
      sendto_one_numeric(source_p, &me, ERR_TOOMANYKNOCK, chptr->chname, "channel");
      return 0;
    }

    source_p->localClient->last_knock = CurrentTime;
    sendto_one_numeric(source_p, &me, RPL_KNOCKDLVR, chptr->chname);
  }

  chptr->last_knock = CurrentTime;

  sendto_channel_local(CHFL_CHANOP, 0, chptr,
                       ":%s NOTICE @%s :KNOCK: %s (%s [%s@%s] has asked for an invite)",
                       me.name, chptr->chname, chptr->chname,
                       source_p->name,
                       source_p->username,
                       source_p->host);

  sendto_server(client_p, CAP_KNOCK, NOCAPS, ":%s KNOCK %s",
                ID(source_p), chptr->chname);
  return 0;
}

static struct Message knock_msgtab =
{
  "KNOCK", 0, 0, 2, MAXPARA, MFLG_SLOW, 0,
  { m_unregistered, m_knock, m_knock, m_ignore, m_knock, m_ignore }
};

static void
module_init(void)
{
  mod_add_cmd(&knock_msgtab);
  add_capability("KNOCK", CAP_KNOCK, 1);
  add_isupport("KNOCK", NULL, -1);
}

static void
module_exit(void)
{
  mod_del_cmd(&knock_msgtab);
  delete_capability("KNOCK");
  delete_isupport("KNOCK");
}

struct module module_entry =
{
  .node    = { NULL, NULL, NULL },
  .name    = NULL,
  .version = "$Revision$",
  .handle  = NULL,
  .modinit = module_init,
  .modexit = module_exit,
  .flags   = 0
};
Revision:	3135
Committed:	Mon Mar 10 21:11:25 2014 UTC (11 years, 5 months ago) by michael
Content type:	text/x-csrc
File size:	4754 byte(s)
Log Message:	- Server now no longer accepts TS5 links
#	User	Rev	Content
1	adx	30	/*
2	michael	2820	* ircd-hybrid: an advanced, lightweight Internet Relay Chat Daemon (ircd)
3	adx	30	*
4	michael	2820	* Copyright (c) 1998-2014 ircd-hybrid development team
5	adx	30	*
6			* This program is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* This program is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with this program; if not, write to the Free Software
18			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
19			* USA
20			*/
21
22	michael	2820	/*! \file m_knock.c
23			* \brief Includes required functions for processing the KNOCK command.
24			* \version $Id$
25			*/
26
27	adx	30	#include "stdinc.h"
28	michael	1011	#include "list.h"
29	adx	30	#include "channel.h"
30			#include "channel_mode.h"
31			#include "client.h"
32			#include "hash.h"
33			#include "irc_string.h"
34			#include "ircd.h"
35			#include "numeric.h"
36			#include "send.h"
37	michael	1309	#include "conf.h"
38	adx	30	#include "parse.h"
39			#include "modules.h"
40			#include "s_serv.h"
41			#include "s_user.h"
42
43
44			/* m_knock
45	michael	3096	* parv[0] = command
46	adx	30	* parv[1] = channel
47			*
48			* The KNOCK command has the following syntax:
49			* :<sender> KNOCK <channel>
50			*
51			* If a user is not banned from the channel they can use the KNOCK
52			* command to have the server NOTICE the channel operators notifying
53			* they would like to join. Helpful if the channel is invite-only, the
54			* key is forgotten, or the channel is full (INVITE can bypass each one
55			* of these conditions. Concept by Dianora <db@db.net> and written by
56			* <anonymous>
57			*/
58	michael	2820	static int
59	adx	30	m_knock(struct Client client_p, struct Client source_p,
60			int parc, char *parv[])
61			{
62	michael	885	struct Channel *chptr = NULL;
63	adx	30
64	michael	885	if (EmptyString(parv[1]))
65	adx	30	{
66	michael	3109	sendto_one_numeric(source_p, &me, ERR_NEEDMOREPARAMS, "KNOCK");
67	michael	2820	return 0;
68	adx	30	}
69
70	michael	885	if ((chptr = hash_find_channel(parv[1])) == NULL)
71	adx	30	{
72	michael	3109	sendto_one_numeric(source_p, &me, ERR_NOSUCHCHANNEL, parv[1]);
73	michael	2820	return 0;
74	adx	30	}
75
76			/* Normal channel, just be sure they aren't on it */
77			if (IsMember(source_p, chptr))
78			{
79	michael	3109	sendto_one_numeric(source_p, &me, ERR_KNOCKONCHAN, chptr->chname);
80	michael	2820	return 0;
81	adx	30	}
82
83			if (!((chptr->mode.mode & MODE_INVITEONLY) \|\| (*chptr->mode.key) \|\|
84			(chptr->mode.limit && dlink_list_length(&chptr->members) >=
85			chptr->mode.limit)))
86			{
87	michael	3109	sendto_one_numeric(source_p, &me, ERR_CHANOPEN, chptr->chname);
88	michael	2820	return 0;
89	adx	30	}
90
91	michael	885	if (MyClient(source_p))
92	adx	30	{
93	michael	886	/*
94			* Don't allow a knock if the user is banned, or the channel is private
95			*/
96			if (PrivateChannel(chptr) \|\| is_banned(chptr, source_p))
97	michael	885	{
98	michael	3109	sendto_one_numeric(source_p, &me, ERR_CANNOTSENDTOCHAN, chptr->chname);
99	michael	2820	return 0;
100	michael	885	}
101	adx	30
102	michael	885	/*
103			* flood protection:
104			* allow one knock per user per knock_delay
105			* allow one knock per channel per knock_delay_channel
106			*
107			* we only limit local requests..
108			*/
109			if ((source_p->localClient->last_knock + ConfigChannel.knock_delay) >
110			CurrentTime)
111			{
112	michael	3109	sendto_one_numeric(source_p, &me, ERR_TOOMANYKNOCK, chptr->chname, "user");
113	michael	2820	return 0;
114	michael	885	}
115	adx	30
116	michael	885	if ((chptr->last_knock + ConfigChannel.knock_delay_channel) > CurrentTime)
117			{
118	michael	3109	sendto_one_numeric(source_p, &me, ERR_TOOMANYKNOCK, chptr->chname, "channel");
119	michael	2820	return 0;
120	michael	885	}
121	adx	30
122	michael	885	source_p->localClient->last_knock = CurrentTime;
123	michael	3109	sendto_one_numeric(source_p, &me, RPL_KNOCKDLVR, chptr->chname);
124	michael	885	}
125	adx	30
126			chptr->last_knock = CurrentTime;
127
128	michael	1496	sendto_channel_local(CHFL_CHANOP, 0, chptr,
129			":%s NOTICE @%s :KNOCK: %s (%s [%s@%s] has asked for an invite)",
130	michael	1495	me.name, chptr->chname, chptr->chname,
131	michael	1496	source_p->name,
132			source_p->username,
133	michael	1495	source_p->host);
134	adx	30
135	michael	3135	sendto_server(client_p, CAP_KNOCK, NOCAPS, ":%s KNOCK %s",
136			ID(source_p), chptr->chname);
137	michael	2820	return 0;
138	adx	30	}
139	michael	1230
140	michael	2820	static struct Message knock_msgtab =
141			{
142	michael	1230	"KNOCK", 0, 0, 2, MAXPARA, MFLG_SLOW, 0,
143			{ m_unregistered, m_knock, m_knock, m_ignore, m_knock, m_ignore }
144			};
145
146			static void
147			module_init(void)
148			{
149			mod_add_cmd(&knock_msgtab);
150			add_capability("KNOCK", CAP_KNOCK, 1);
151			add_isupport("KNOCK", NULL, -1);
152			}
153
154			static void
155			module_exit(void)
156			{
157			mod_del_cmd(&knock_msgtab);
158			delete_capability("KNOCK");
159			delete_isupport("KNOCK");
160			}
161
162	michael	2820	struct module module_entry =
163			{
164	michael	1230	.node = { NULL, NULL, NULL },
165			.name = NULL,
166			.version = "$Revision$",
167			.handle = NULL,
168			.modinit = module_init,
169			.modexit = module_exit,
170			.flags = 0
171			};