344 lines
10 KiB
C
344 lines
10 KiB
C
/*
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* IRC - Internet Relay Chat, ircd/m_connect.c
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* Copyright (C) 1990 Jarkko Oikarinen and
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* University of Oulu, Computing Center
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*
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* See file AUTHORS in IRC package for additional names of
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* the programmers.
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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 1, or (at your option)
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* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id: m_connect.c 1807 2007-05-20 13:55:59Z entrope $
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*/
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/*
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* m_functions execute protocol messages on this server:
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*
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* cptr is always NON-NULL, pointing to a *LOCAL* client
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* structure (with an open socket connected!). This
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* identifies the physical socket where the message
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* originated (or which caused the m_function to be
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* executed--some m_functions may call others...).
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*
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* sptr is the source of the message, defined by the
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* prefix part of the message if present. If not
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* or prefix not found, then sptr==cptr.
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*
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* (!IsServer(cptr)) => (cptr == sptr), because
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* prefixes are taken *only* from servers...
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*
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* (IsServer(cptr))
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* (sptr == cptr) => the message didn't
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* have the prefix.
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*
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* (sptr != cptr && IsServer(sptr) means
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* the prefix specified servername. (?)
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*
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* (sptr != cptr && !IsServer(sptr) means
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* that message originated from a remote
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* user (not local).
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*
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* combining
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*
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* (!IsServer(sptr)) means that, sptr can safely
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* taken as defining the target structure of the
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* message in this server.
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*
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* *Always* true (if 'parse' and others are working correct):
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*
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* 1) sptr->from == cptr (note: cptr->from == cptr)
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*
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* 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
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* *cannot* be a local connection, unless it's
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* actually cptr!). [MyConnect(x) should probably
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* be defined as (x == x->from) --msa ]
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*
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* parc number of variable parameter strings (if zero,
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* parv is allowed to be NULL)
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*
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* parv a NULL terminated list of parameter pointers,
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*
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* parv[0], sender (prefix string), if not present
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* this points to an empty string.
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* parv[1]...parv[parc-1]
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* pointers to additional parameters
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* parv[parc] == NULL, *always*
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*
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* note: it is guaranteed that parv[0]..parv[parc-1] are all
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* non-NULL pointers.
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*/
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#include "config.h"
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#include "client.h"
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#include "crule.h"
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#include "hash.h"
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#include "ircd.h"
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#include "ircd_features.h"
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#include "ircd_log.h"
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#include "ircd_reply.h"
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#include "ircd_string.h"
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#include "jupe.h"
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#include "match.h"
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#include "msg.h"
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#include "numeric.h"
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#include "numnicks.h"
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#include "s_bsd.h"
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#include "s_conf.h"
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#include "s_user.h"
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#include "send.h"
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/* #include <assert.h> -- Now using assert in ircd_log.h */
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#include <stdlib.h>
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/*
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* ms_connect - server message handler
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* - Added by Jto 11 Feb 1989
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*
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* parv[0] = sender prefix
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* parv[1] = servername
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* parv[2] = port number
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* parv[3] = remote server
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*/
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int ms_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
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{
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unsigned short port;
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unsigned short tmpport;
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const char* rule;
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struct ConfItem* aconf;
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struct Client* acptr;
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struct Jupe* ajupe;
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assert(0 != cptr);
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assert(0 != sptr);
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if (!IsPrivileged(sptr))
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return send_reply(sptr, ERR_NOPRIVILEGES);
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if (parc < 4) {
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/*
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* this is coming from a server which should have already
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* checked it's args, if we don't have parc == 4, something
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* isn't right.
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*/
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protocol_violation(sptr, "Too few parameters to connect");
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return need_more_params(sptr, "CONNECT");
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}
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if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc, parv)
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!= HUNTED_ISME)
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return 0;
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/*
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* need to find the conf entry first so we can use the server name from
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* the conf entry instead of parv[1] to find out if the server is already
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* present below. --Bleep
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*/
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if (0 == (aconf = conf_find_server(parv[1]))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed "
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"in ircd.conf", sptr, parv[1]);
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return 0;
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}
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/*
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* use aconf->name to look up the server
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*/
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if ((acptr = FindServer(aconf->name))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already "
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"exists from %s", sptr, parv[1], cli_name(cli_from(acptr)));
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return 0;
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}
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/*
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* Evaluate connection rules... If no rules found, allow the
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* connect. Otherwise stop with the first true rule (ie: rules
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* are ored together. Oper connects are effected only by D
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* lines (CRULEALL) not d lines (CRULEAUTO).
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*/
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if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule);
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return 0;
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}
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/*
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* Check to see if the server is juped; if it is, disallow the connect
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*/
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if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s",
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sptr, JupeServer(ajupe), JupeReason(ajupe));
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return 0;
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}
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/*
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* Allow opers to /connect foo.* 0 bah.* to connect foo and bah
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* using the conf's configured port
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*/
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port = atoi(parv[2]);
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/*
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* save the old port
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*/
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tmpport = aconf->address.port;
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if (port)
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aconf->address.port = port;
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else
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port = aconf->address.port;
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/*
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* Notify all operators about remote connect requests
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*/
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sendwallto_group_butone(&me, WALL_WALLOPS, 0,
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"Remote CONNECT %s %s from %s", parv[1],
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parv[2] ? parv[2] : "",
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get_client_name(sptr, HIDE_IP));
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log_write(LS_NETWORK, L_INFO, 0, "CONNECT From %C : %s %s", sptr, parv[1],
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parv[2] ? parv[2] : "");
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if (connect_server(aconf, sptr)) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr,
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aconf->name);
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}
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else {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed",
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sptr, aconf->name);
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}
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aconf->address.port = tmpport;
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return 0;
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}
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/*
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* mo_connect - oper message handler
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* - Added by Jto 11 Feb 1989
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*
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* parv[0] = sender prefix
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* parv[1] = servername
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* parv[2] = port number
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* parv[3] = remote server
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*/
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int mo_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
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{
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unsigned short port;
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unsigned short tmpport;
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const char* rule;
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struct ConfItem* aconf;
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struct Client* acptr;
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struct Jupe* ajupe;
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assert(0 != cptr);
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assert(cptr == sptr);
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assert(IsAnOper(sptr));
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if (parc < 2)
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return need_more_params(sptr, "CONNECT");
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if (parc > 3) {
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/*
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* if parc > 3, we are trying to connect two remote
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* servers to each other
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*/
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if (IsLocOp(sptr)) {
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/*
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* Only allow LocOps to make local CONNECTS --SRB
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*/
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return send_reply(cptr, ERR_NOPRIVILEGES);
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}
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else {
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struct Client* acptr2;
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struct Client* acptr3;
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if (!(acptr3 = find_match_server(parv[3]))) {
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return send_reply(sptr, ERR_NOSUCHSERVER, parv[3]);
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}
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/*
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* Look for closest matching server
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* needed for "/connect blah 4400 *"?
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*/
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for (acptr2 = acptr3; acptr2 != &me; acptr2 = cli_serv(acptr2)->up) {
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if (!match(parv[3], cli_name(acptr2)))
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acptr3 = acptr2;
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}
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parv[3] = cli_name(acptr3);
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if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc,
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parv) != HUNTED_ISME)
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return 0;
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}
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}
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/*
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* need to find the conf entry first so we can use the server name from
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* the conf entry instead of parv[1] to find out if the server is already
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* present below. --Bleep
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*/
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if (0 == (aconf = conf_find_server(parv[1]))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed "
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"in ircd.conf", sptr, parv[1]);
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return 0;
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}
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/*
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* use aconf->name to look up the server, see above
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*/
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if ((acptr = FindServer(aconf->name))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already "
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"exists from %s", sptr, parv[1], cli_name(cli_from(acptr)));
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return 0;
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}
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/*
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* Evaluate connection rules... If no rules found, allow the
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* connect. Otherwise stop with the first true rule (ie: rules
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* are ored together. Oper connects are effected only by D
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* lines (CRULEALL) not d lines (CRULEAUTO).
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*/
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if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule);
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return 0;
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}
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/*
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* Check to see if the server is juped; if it is, disallow the connect
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*/
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if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s",
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sptr, JupeServer(ajupe), JupeReason(ajupe));
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return 0;
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}
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/*
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* Get port number from user, if given. If not specified,
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* use the default from configuration structure. If missing
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* from there, then use the precompiled default.
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*/
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port = aconf->address.port;
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if (parc > 2) {
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assert(0 != parv[2]);
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if (0 == (port = atoi(parv[2]))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Invalid port number",
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sptr);
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return 0;
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}
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}
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if (0 == port && 0 == (port = feature_int(FEAT_SERVER_PORT))) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: missing port number",
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sptr);
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return 0;
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}
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tmpport = aconf->address.port;
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aconf->address.port = port;
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if (connect_server(aconf, sptr)) {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr,
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aconf->name);
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}
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else {
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sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed",
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sptr, aconf->name);
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}
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aconf->address.port = tmpport;
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return 0;
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}
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