417 lines
11 KiB
C
417 lines
11 KiB
C
/*
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* NeoIRCd: NeoStats Group. Based on Hybird7
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* m_knock.c: Requests to be invited to a channel.
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*
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* Copyright (C) 2002 by the past and present ircd coders, and others.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*
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* $Id: m_knock.c,v 1.7 2002/09/19 05:41:10 fishwaldo Exp $
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*/
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#include "stdinc.h"
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#include "tools.h"
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#include "handlers.h"
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#include "channel.h"
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#include "channel_mode.h"
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#include "client.h"
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#include "hash.h"
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#include "irc_string.h"
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#include "ircd.h"
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#include "numeric.h"
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#include "send.h"
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#include "s_conf.h"
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#include "msg.h"
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#include "parse.h"
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#include "modules.h"
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#include "s_serv.h"
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static void m_knock(struct Client*, struct Client*, int, char**);
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static void ms_knock(struct Client *, struct Client *, int, char**);
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static void parse_knock_local(struct Client *, struct Client *,
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int, char **, char *);
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static void parse_knock_remote(struct Client *, struct Client *,
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int, char **);
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static void send_knock(struct Client *, struct Client *,
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struct Channel *, char *, char *, int);
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static int is_banned_knock(struct Channel *, struct Client *, char *);
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static int check_banned_knock(struct Channel *, struct Client *,
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char *, char *, char *);
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struct Message knock_msgtab = {
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"KNOCK", 0, 0, 2, 0, MFLG_SLOW, 0,
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{m_unregistered, m_knock, ms_knock, m_knock}
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};
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struct Message knockll_msgtab = {
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"KNOCKLL", 0, 0, 2, 0, MFLG_SLOW, 0,
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{m_unregistered, m_ignore, m_knock, m_ignore}
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};
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#ifndef STATIC_MODULES
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void
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_modinit(void)
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{
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mod_add_cmd(&knock_msgtab);
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mod_add_cmd(&knockll_msgtab);
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}
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void
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_moddeinit(void)
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{
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mod_del_cmd(&knock_msgtab);
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mod_del_cmd(&knockll_msgtab);
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}
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const char *_version = "$Revision: 1.7 $";
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#endif
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/* m_knock
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* parv[0] = sender prefix
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* parv[1] = channel
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* parv[2] = 'key' (for vchan)
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*
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* The KNOCK command has the following syntax:
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* :<sender> KNOCK <channel> <vchan id>
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*
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* If a user is not banned from the channel they can use the KNOCK
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* command to have the server NOTICE the channel operators notifying
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* they would like to join. Helpful if the channel is invite-only, the
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* key is forgotten, or the channel is full (INVITE can bypass each one
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* of these conditions. Concept by Dianora <db@db.net> and written by
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* <anonymous>
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*
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* This function is also used for LL servers forwarding knock requests they
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* dont know about, for us to answer.
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*/
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static void
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m_knock(struct Client *client_p, struct Client *source_p, int parc,
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char *parv[])
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{
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char *sockhost = NULL;
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/* a remote KNOCKLL request, check we're capable of handling it.. */
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if(!MyConnect(source_p))
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{
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if(!ServerInfo.hub || !IsCapable(client_p, CAP_LL) || parc < 3)
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return;
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else
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{
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/* set sockhost to parv[2], then shift the vchan id down if it
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* exists.. done here to save messing in parse_knock_local()
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*/
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sockhost = parv[2];
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if(parc > 3)
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{
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parv[2] = parv[3];
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parv[3] = NULL;
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}
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else
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parv[2] = NULL;
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parc--;
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}
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}
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if(IsClient(source_p))
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parse_knock_local(client_p, source_p, parc, parv, sockhost);
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}
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/*
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* ms_knock()
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* parv[0] = sender prefix
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* parv[1] = channel
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* parv[2] = vchan id
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*/
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static void
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ms_knock(struct Client *client_p, struct Client *source_p,
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int parc, char *parv[])
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{
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if(IsClient(source_p))
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parse_knock_remote(client_p, source_p, parc, parv);
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}
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/*
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* parse_knock_local()
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*
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* input - pointer to physical struct client_p
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* - pointer to source struct source_p
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* - number of args
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* - pointer to array of args
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* - clients sockhost (if remote)
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* output -
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* side effects - sets name to name of base channel
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* or sends failure message to source_p
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*/
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static void
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parse_knock_local(struct Client *client_p, struct Client *source_p,
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int parc, char *parv[], char *sockhost)
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{
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/* We will cut at the first comma reached, however we will not *
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* process anything afterwards. */
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struct Channel *chptr;
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char *p, *name, *key;
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name = parv[1];
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key = (parc > 2) ? parv[2] : NULL;
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if((p = strchr(name,',')) != NULL)
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*p = '\0';
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if(!IsChannelName(name))
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{
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sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL),
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me.name, parv[0], name);
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return;
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}
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if(!(chptr = hash_find_channel(name)))
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{
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if(!ServerInfo.hub && uplink && IsCapable(uplink, CAP_LL))
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{
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sendto_one(uplink, ":%s KNOCKLL %s %s %s",
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source_p->name, parv[1],
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source_p->localClient->sockhost,
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(parc > 2) ? parv[2] : "");
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}
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else
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{
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sendto_one(source_p, form_str(ERR_NOSUCHCHANNEL), me.name, parv[0],
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name);
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}
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return;
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}
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{
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/* Normal channel, just be sure they aren't on it */
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if (IsMember(source_p, chptr))
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{
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sendto_one(source_p, form_str(ERR_KNOCKONCHAN),
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me.name, source_p->name, name);
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return;
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}
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}
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if(!((chptr->mode.mode & MODE_INVITEONLY) ||
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(*chptr->mode.key) ||
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(chptr->mode.limit && chptr->users >= chptr->mode.limit )
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))
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{
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sendto_one(source_p, form_str(ERR_CHANOPEN),
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me.name, source_p->name, name);
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return;
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}
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/* don't allow a knock if the user is banned, or the channel is secret */
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if ((chptr->mode.mode & MODE_PRIVATE) ||
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(sockhost && is_banned_knock(chptr, source_p, sockhost)) ||
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(!sockhost && is_banned(chptr, source_p)))
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{
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sendto_one(source_p, form_str(ERR_CANNOTSENDTOCHAN), me.name, parv[0],
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name);
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return;
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}
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/* flood protection:
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* allow one knock per user per knock_delay
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* allow one knock per channel per knock_delay_channel
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*
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* we only limit local requests..
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*/
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if(MyClient(source_p) &&
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(source_p->localClient->last_knock + ConfigChannel.knock_delay) > CurrentTime)
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{
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sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
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me.name, source_p->name, parv[1], "user");
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return;
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}
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else if((chptr->last_knock +
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ConfigChannel.knock_delay_channel) > CurrentTime)
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{
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sendto_one(source_p, form_str(ERR_TOOMANYKNOCK),
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me.name, source_p->name, parv[1], "channel");
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return;
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}
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/* pass on the knock */
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send_knock(client_p, source_p, chptr, name, key,
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MyClient(source_p) ? 0 : 1);
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}
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/*
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* parse_knock_remote
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*
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* input - pointer to client
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* - pointer to source
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* - number of args
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* - pointer to array of args
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* output - none
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* side effects - knock is checked for validity, if valid send_knock() is
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* called
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*/
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static void
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parse_knock_remote(struct Client *client_p, struct Client *source_p,
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int parc, char *parv[])
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{
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struct Channel *chptr;
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char *p, *name, *key;
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name = parv[1];
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key = (parc > 2) ? parv[2] : NULL;
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if((p = strchr(name,',')) != NULL)
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*p = '\0';
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if(!IsChannelName(name) || !(chptr = hash_find_channel(name)))
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return;
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if(IsMember(source_p, chptr))
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return;
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if(!((chptr->mode.mode & MODE_INVITEONLY) ||
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(*chptr->mode.key) ||
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(chptr->mode.limit && chptr->users >= chptr->mode.limit)))
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return;
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if(chptr)
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send_knock(client_p, source_p, chptr, name, key, 0);
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return;
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}
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/*
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* send_knock
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*
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* input - pointer to physical struct client_p
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* - pointer to source struct source_p
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* - pointer to channel struct chptr
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* - pointer to base channel name
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* output -
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* side effects - knock is sent locally (if enabled) and propagated
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*/
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static void
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send_knock(struct Client *client_p, struct Client *source_p,
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struct Channel *chptr, char *name, char *key, int llclient)
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{
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chptr->last_knock = CurrentTime;
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if(MyClient(source_p))
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{
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source_p->localClient->last_knock = CurrentTime;
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sendto_one(source_p, form_str(RPL_KNOCKDLVR),
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me.name, source_p->name, name);
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}
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else if(llclient == 1)
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sendto_one(source_p, form_str(RPL_KNOCKDLVR),
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me.name, source_p->name, name);
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if(source_p->user != NULL)
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{
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sendto_channel_local(ONLY_CHANOPS_HALFOPS,
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chptr,
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form_str(RPL_KNOCK),
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me.name,
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name,
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name,
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source_p->name,
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source_p->username,
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source_p->vhost);
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sendto_server(client_p, source_p, chptr, NOCAPS, NOCAPS, LL_ICLIENT,
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":%s KNOCK %s %s",
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source_p->name, name, key ? key : "");
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}
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return;
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}
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/* is_banned_knock()
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*
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* input - pointer to channel
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* - pointer to client
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* - clients sockhost
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* output -
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* side effects - return check_banned_knock()
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*/
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static int is_banned_knock(struct Channel *chptr, struct Client *who,
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char *sockhost)
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{
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char src_host[NICKLEN + USERLEN + HOSTLEN + 6];
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char src_iphost[NICKLEN + USERLEN + HOSTLEN + 6];
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char src_vhost[NICKLEN + USERLEN + HOSTLEN +6];
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if(!IsPerson(who))
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return 0;
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ircsprintf(src_host,"%s!%s@%s", who->name, who->username, who->host);
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ircsprintf(src_iphost,"%s!%s@%s", who->name, who->username, sockhost);
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ircsprintf(src_vhost, "%s!%s@%s", who->name, who->username, who->vhost);
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return (check_banned_knock(chptr, who, src_host, src_iphost, src_vhost));
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}
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/* check_banned_knock()
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*
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* input - pointer to channel
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* - pointer to client
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* - preformed nick!user@host
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* - preformed nick!user@ip
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* output -
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* side effects - return CHFL_EXCEPTION, CHFL_BAN or 0
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*/
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static int check_banned_knock(struct Channel *chptr, struct Client *who,
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char *s, char *s2, char *s3)
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{
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dlink_node *ban;
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dlink_node *except;
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struct Ban *actualBan = NULL;
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struct Ban *actualExcept = NULL;
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DLINK_FOREACH(ban, chptr->banlist.head)
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{
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actualBan = ban->data;
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if (match(actualBan->banstr, s) || match(actualBan->banstr, s2) || match(actualBan->banstr, s3))
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break;
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else
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actualBan = NULL;
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}
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if ((actualBan != NULL))
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{
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DLINK_FOREACH(except, chptr->exceptlist.head)
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{
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actualExcept = except->data;
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if (match(actualExcept->banstr, s) || match(actualExcept->banstr, s2) || match(actualBan->banstr, s3))
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return CHFL_EXCEPTION;
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}
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}
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return ((actualBan ? CHFL_BAN : 0));
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}
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