/*
* IRC - Internet Relay Chat, ircd/m_connect.c
* Copyright (C) 1990 Jarkko Oikarinen and
* University of Oulu, Computing Center
*
* See file AUTHORS in IRC package for additional names of
* the programmers.
*
* 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
* $Id: m_connect.c 440 2002-12-29 02:55:36Z pierreg0 $
*/
/*
* m_functions execute protocol messages on this server:
*
* cptr is always NON-NULL, pointing to a *LOCAL* client
* structure (with an open socket connected!). This
* identifies the physical socket where the message
* originated (or which caused the m_function to be
* executed--some m_functions may call others...).
*
* sptr is the source of the message, defined by the
* prefix part of the message if present. If not
* or prefix not found, then sptr==cptr.
*
* (!IsServer(cptr)) => (cptr == sptr), because
* prefixes are taken *only* from servers...
*
* (IsServer(cptr))
* (sptr == cptr) => the message didn't
* have the prefix.
*
* (sptr != cptr && IsServer(sptr) means
* the prefix specified servername. (?)
*
* (sptr != cptr && !IsServer(sptr) means
* that message originated from a remote
* user (not local).
*
* combining
*
* (!IsServer(sptr)) means that, sptr can safely
* taken as defining the target structure of the
* message in this server.
*
* *Always* true (if 'parse' and others are working correct):
*
* 1) sptr->from == cptr (note: cptr->from == cptr)
*
* 2) MyConnect(sptr) <=> sptr == cptr (e.g. sptr
* *cannot* be a local connection, unless it's
* actually cptr!). [MyConnect(x) should probably
* be defined as (x == x->from) --msa ]
*
* parc number of variable parameter strings (if zero,
* parv is allowed to be NULL)
*
* parv a NULL terminated list of parameter pointers,
*
* parv[0], sender (prefix string), if not present
* this points to an empty string.
* parv[1]...parv[parc-1]
* pointers to additional parameters
* parv[parc] == NULL, *always*
*
* note: it is guaranteed that parv[0]..parv[parc-1] are all
* non-NULL pointers.
*/
#include "config.h"
#include "client.h"
#include "crule.h"
#include "hash.h"
#include "ircd.h"
#include "ircd_features.h"
#include "ircd_log.h"
#include "ircd_reply.h"
#include "ircd_string.h"
#include "jupe.h"
#include "match.h"
#include "msg.h"
#include "numeric.h"
#include "numnicks.h"
#include "s_bsd.h"
#include "s_conf.h"
#include "s_user.h"
#include "send.h"
#include <assert.h>
#include <stdlib.h>
/*
* ms_connect - server message handler
* - Added by Jto 11 Feb 1989
*
* parv[0] = sender prefix
* parv[1] = servername
* parv[2] = port number
* parv[3] = remote server
*/
int ms_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
unsigned short port;
unsigned short tmpport;
const char* rule;
struct ConfItem* aconf;
struct Client* acptr;
struct Jupe* ajupe;
assert(0 != cptr);
assert(0 != sptr);
if (!IsPrivileged(sptr))
return send_reply(sptr, ERR_NOPRIVILEGES);
if (parc < 4) {
/*
* this is coming from a server which should have already
* checked it's args, if we don't have parc == 4, something
* isn't right.
*/
protocol_violation(sptr, "Too few parameters to connect");
return need_more_params(sptr, "CONNECT");
}
if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc, parv)
!= HUNTED_ISME)
return 0;
/*
* need to find the conf entry first so we can use the server name from
* the conf entry instead of parv[1] to find out if the server is already
* present below. --Bleep
*/
if (0 == (aconf = conf_find_server(parv[1]))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed "
"in ircd.conf", sptr, parv[1]);
return 0;
}
/*
* use aconf->name to look up the server
*/
if ((acptr = FindServer(aconf->name))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already "
"exists from %s", sptr, parv[1], cli_name(cli_from(acptr)));
return 0;
}
/*
* Evaluate connection rules... If no rules found, allow the
* connect. Otherwise stop with the first true rule (ie: rules
* are ored together. Oper connects are effected only by D
* lines (CRULEALL) not d lines (CRULEAUTO).
*/
if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule);
return 0;
}
/*
* Check to see if the server is juped; if it is, disallow the connect
*/
if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s",
sptr, JupeServer(ajupe), JupeReason(ajupe));
return 0;
}
/*
* Allow opers to /connect foo.* 0 bah.* to connect foo and bah
* using the conf's configured port
*/
port = atoi(parv[2]);
/*
* save the old port
*/
tmpport = aconf->port;
if (port) {
aconf->port = port;
}
else {
port = aconf->port;
}
/*
* Notify all operators about remote connect requests
*/
sendwallto_group_butone(&me, WALL_WALLOPS, 0,
"Remote CONNECT %s %s from %s", parv[1],
parv[2] ? parv[2] : "",
get_client_name(sptr, HIDE_IP));
log_write(LS_NETWORK, L_INFO, 0, "CONNECT From %C : %s %s", sptr, parv[1],
parv[2] ? parv[2] : "");
if (connect_server(aconf, sptr, 0)) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr,
aconf->name);
}
else {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed",
sptr, aconf->name);
}
aconf->port = tmpport;
return 0;
}
/*
* mo_connect - oper message handler
* - Added by Jto 11 Feb 1989
*
* parv[0] = sender prefix
* parv[1] = servername
* parv[2] = port number
* parv[3] = remote server
*/
int mo_connect(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
{
unsigned short port;
unsigned short tmpport;
const char* rule;
struct ConfItem* aconf;
struct Client* acptr;
struct Jupe* ajupe;
assert(0 != cptr);
assert(cptr == sptr);
assert(IsAnOper(sptr));
if (parc < 2)
return need_more_params(sptr, "CONNECT");
if (parc > 3) {
/*
* if parc > 3, we are trying to connect two remote
* servers to each other
*/
if (IsLocOp(sptr)) {
/*
* Only allow LocOps to make local CONNECTS --SRB
*/
return 0;
}
else {
struct Client* acptr2;
struct Client* acptr3;
if (!(acptr3 = find_match_server(parv[3]))) {
send_reply(sptr, ERR_NOSUCHSERVER, parv[3]);
return 0;
}
/*
* Look for closest matching server
* needed for "/connect blah 4400 *"?
*/
for (acptr2 = acptr3; acptr2 != &me; acptr2 = cli_serv(acptr2)->up) {
if (!match(parv[3], cli_name(acptr2)))
acptr3 = acptr2;
}
parv[3] = cli_name(acptr3);
if (hunt_server_cmd(sptr, CMD_CONNECT, cptr, 1, "%s %s :%C", 3, parc,
parv) != HUNTED_ISME)
return 0;
}
}
/*
* need to find the conf entry first so we can use the server name from
* the conf entry instead of parv[1] to find out if the server is already
* present below. --Bleep
*/
if (0 == (aconf = conf_find_server(parv[1]))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Host %s not listed "
"in ircd.conf", sptr, parv[1]);
return 0;
}
/*
* use aconf->name to look up the server, see above
*/
if ((acptr = FindServer(aconf->name))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s already "
"exists from %s", sptr, parv[1], cli_name(cli_from(acptr)));
return 0;
}
/*
* Evaluate connection rules... If no rules found, allow the
* connect. Otherwise stop with the first true rule (ie: rules
* are ored together. Oper connects are effected only by D
* lines (CRULEALL) not d lines (CRULEAUTO).
*/
if ((rule = conf_eval_crule(aconf->name, CRULE_ALL))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Disallowed by rule: %s", sptr, rule);
return 0;
}
/*
* Check to see if the server is juped; if it is, disallow the connect
*/
if ((ajupe = jupe_find(aconf->name)) && JupeIsActive(ajupe)) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Server %s is juped: %s",
sptr, JupeServer(ajupe), JupeReason(ajupe));
return 0;
}
/*
* Get port number from user, if given. If not specified,
* use the default from configuration structure. If missing
* from there, then use the precompiled default.
*/
port = aconf->port;
if (parc > 2) {
assert(0 != parv[2]);
if (0 == (port = atoi(parv[2]))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: Invalid port number",
sptr);
return 0;
}
}
if (0 == port && 0 == (port = feature_int(FEAT_SERVER_PORT))) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :Connect: missing port number",
sptr);
return 0;
}
tmpport = aconf->port;
aconf->port = port;
if (connect_server(aconf, sptr, 0)) {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connecting to %s.", sptr,
aconf->name);
}
else {
sendcmdto_one(&me, CMD_NOTICE, sptr, "%C :*** Connection to %s failed",
sptr, aconf->name);
}
aconf->port = tmpport;
return 0;
}
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