elemental-ircd/modules/m_connect.c

/*
 *  ircd-ratbox: A slightly useful ircd.
 *  m_connect.c: Connects to a remote IRC server.
 *
 *  Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
 *  Copyright (C) 1996-2002 Hybrid Development Team
 *  Copyright (C) 2002-2005 ircd-ratbox 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
 *
 */

#include "stdinc.h"
#include "client.h"
#include "ircd.h"
#include "match.h"
#include "numeric.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "logger.h"
#include "s_serv.h"
#include "send.h"
#include "msg.h"
#include "parse.h"
#include "hash.h"
#include "modules.h"
#include "sslproc.h"

static int mo_connect(struct Client *, struct Client *, int, const char **);
static int ms_connect(struct Client *, struct Client *, int, const char **);

struct Message connect_msgtab = {
    "CONNECT", 0, 0, 0, MFLG_SLOW,
    {mg_unreg, mg_not_oper, {ms_connect, 4}, {ms_connect, 4}, mg_ignore, {mo_connect, 2}}
};

mapi_clist_av1 connect_clist[] = { &connect_msgtab, NULL };
DECLARE_MODULE_AV1(connect, NULL, NULL, connect_clist, NULL, NULL, "$Revision: 3161 $");

/*
 * mo_connect - CONNECT command handler
 *
 * Added by Jto 11 Feb 1989
 *
 * m_connect
 *      parv[1] = servername
 *      parv[2] = port number
 *      parv[3] = remote server
 */
static int
mo_connect(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    int port;
    int tmpport;
    struct server_conf *server_p;
    struct Client *target_p;

    /* always privileged with handlers */

    if(MyConnect(source_p) && !IsOperRemote(source_p) && parc > 3) {
        sendto_one(source_p, form_str(ERR_NOPRIVS),
                   me.name, source_p->name, "remote");
        return 0;
    }

    if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
        return 0;

    if((target_p = find_server(source_p, parv[1]))) {
        sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.", parv[1],
                          target_p->from->name);
        return 0;
    }

    /*
     * try to find the name, then host, if both fail notify ops and bail
     */
    if((server_p = find_server_conf(parv[1])) == NULL) {
        sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf", parv[1]);
        return 0;
    }

    if(ServerConfSSL(server_p) && (!ssl_ok || !get_ssld_count())) {
        sendto_one_notice(source_p,
                          ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
                          parv[1]);
        return 0;
    }

    /*
     * Get port number from user, if given. If not specified,
     * use the default form configuration structure. If missing
     * from there, then use the precompiled default.
     */
    tmpport = port = server_p->port;
    if(parc > 2 && !EmptyString(parv[2])) {
        if((port = atoi(parv[2])) <= 0) {
            sendto_one_notice(source_p, ":Connect: Illegal port number");
            return 0;
        }
    } else if(port <= 0 && (port = PORTNUM) <= 0) {
        sendto_one_notice(source_p, ":Connect: missing port number");
        return 0;
    }
    /*
     * Notify all operators about remote connect requests
     */

    ilog(L_SERVER, "CONNECT From %s : %s %s", source_p->name, parv[1], parc > 2 ? parv[2] : "");

    server_p->port = port;
    /*
     * at this point we should be calling connect_server with a valid
     * C:line and a valid port in the C:line
     */
    if(serv_connect(server_p, source_p)) {
        sendto_one_notice(source_p, ":*** Connecting to %s.%d",
                          server_p->name, server_p->port);
    } else {
        sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
                          server_p->name, server_p->port);
    }

    /*
     * client is either connecting with all the data it needs or has been
     * destroyed
     */
    server_p->port = tmpport;
    return 0;
}

/*
 * ms_connect - CONNECT command handler
 *
 * Added by Jto 11 Feb 1989
 *
 * m_connect
 *      parv[1] = servername
 *      parv[2] = port number
 *      parv[3] = remote server
 */
static int
ms_connect(struct Client *client_p, struct Client *source_p, int parc, const char *parv[])
{
    int port;
    int tmpport;
    struct server_conf *server_p;
    struct Client *target_p;

    if(hunt_server(client_p, source_p, ":%s CONNECT %s %s :%s", 3, parc, parv) != HUNTED_ISME)
        return 0;

    if((target_p = find_server(NULL, parv[1]))) {
        sendto_one_notice(source_p, ":Connect: Server %s already exists from %s.",
                          parv[1], target_p->from->name);
        return 0;
    }

    /*
     * try to find the name, then host, if both fail notify ops and bail
     */
    if((server_p = find_server_conf(parv[1])) == NULL) {
        sendto_one_notice(source_p, ":Connect: Host %s not listed in ircd.conf",
                          parv[1]);
        return 0;
    }

    if(ServerConfSSL(server_p) && (!ssl_ok || !get_ssld_count())) {
        sendto_one_notice(source_p,
                          ":Connect: Server %s is set to use SSL/TLS but SSL/TLS is not configured.",
                          parv[1]);
        return 0;
    }

    /*
     * Get port number from user, if given. If not specified,
     * use the default form configuration structure. If missing
     * from there, then use the precompiled default.
     */
    tmpport = server_p->port;

    port = atoi(parv[2]);

    /* if someone sends port 0, and we have a config port.. use it */
    if(port == 0 && server_p->port)
        port = server_p->port;
    else if(port <= 0) {
        sendto_one_notice(source_p, ":Connect: Illegal port number");
        return 0;
    }

    /*
     * Notify all operators about remote connect requests
     */
    sendto_wallops_flags(UMODE_WALLOP, &me,
                         "Remote CONNECT %s %d from %s",
                         parv[1], port, source_p->name);
    sendto_server(NULL, NULL, CAP_TS6, NOCAPS,
                  ":%s WALLOPS :Remote CONNECT %s %d from %s",
                  me.id, parv[1], port, source_p->name);

    ilog(L_SERVER, "CONNECT From %s : %s %d", source_p->name, parv[1], port);

    server_p->port = port;
    /*
     * at this point we should be calling connect_server with a valid
     * C:line and a valid port in the C:line
     */
    if(serv_connect(server_p, source_p))
        sendto_one_notice(source_p, ":*** Connecting to %s.%d",
                          server_p->name, server_p->port);
    else
        sendto_one_notice(source_p, ":*** Couldn't connect to %s.%d",
                          server_p->name, server_p->port);
    /*
     * client is either connecting with all the data it needs or has been
     * destroyed
     */
    server_p->port = tmpport;
    return 0;
}