/* protocol_misc.c -- handle the meta-protocol, miscellaneous functions Copyright (C) 1999-2005 Ivo Timmermans, 2000-2006 Guus Sliepen <guus@tinc-vpn.org> 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., 675 Mass Ave, Cambridge, MA 02139, USA. $Id$ */ #include "system.h" #include "conf.h" #include "connection.h" #include "logger.h" #include "meta.h" #include "net.h" #include "netutl.h" #include "protocol.h" #include "utils.h" int maxoutbufsize = 0; /* Status and error notification routines */ bool send_status(connection_t *c, int statusno, const char *statusstring) { cp(); if(!statusstring) statusstring = "Status"; return send_request(c, "%d %d %s", STATUS, statusno, statusstring); } bool status_h(connection_t *c) { int statusno; char statusstring[MAX_STRING_SIZE]; cp(); if(sscanf(c->buffer, "%*d %d " MAX_STRING, &statusno, statusstring) != 2) { logger(LOG_ERR, _("Got bad %s from %s (%s)"), "STATUS", c->name, c->hostname); return false; } ifdebug(STATUS) logger(LOG_NOTICE, _("Status message from %s (%s): %d: %s"), c->name, c->hostname, statusno, statusstring); return true; } bool send_error(connection_t *c, int err, const char *errstring) { cp(); if(!errstring) errstring = "Error"; return send_request(c, "%d %d %s", ERROR, err, errstring); } bool error_h(connection_t *c) { int err; char errorstring[MAX_STRING_SIZE]; cp(); if(sscanf(c->buffer, "%*d %d " MAX_STRING, &err, errorstring) != 2) { logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ERROR", c->name, c->hostname); return false; } ifdebug(ERROR) logger(LOG_NOTICE, _("Error message from %s (%s): %d: %s"), c->name, c->hostname, err, errorstring); terminate_connection(c, c->status.active); return true; } bool send_termreq(connection_t *c) { cp(); return send_request(c, "%d", TERMREQ); } bool termreq_h(connection_t *c) { cp(); terminate_connection(c, c->status.active); return true; } bool send_ping(connection_t *c) { cp(); c->status.pinged = true; c->last_ping_time = now; return send_request(c, "%d", PING); } bool ping_h(connection_t *c) { cp(); return send_pong(c); } bool send_pong(connection_t *c) { cp(); return send_request(c, "%d", PONG); } bool pong_h(connection_t *c) { cp(); c->status.pinged = false; /* Succesful connection, reset timeout if this is an outgoing connection. */ if(c->outgoing) c->outgoing->timeout = 0; return true; } /* Sending and receiving packets via TCP */ bool send_tcppacket(connection_t *c, vpn_packet_t *packet) { cp(); /* If there already is a lot of data in the outbuf buffer, discard this packet. */ if(c->outbuflen > maxoutbufsize) return true; if(!send_request(c, "%d %hd", PACKET, packet->len)) return false; return send_meta(c, (char *)packet->data, packet->len); } bool tcppacket_h(connection_t *c) { short int len; cp(); if(sscanf(c->buffer, "%*d %hd", &len) != 1) { logger(LOG_ERR, _("Got bad %s from %s (%s)"), "PACKET", c->name, c->hostname); return false; } /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */ c->tcplen = len; return true; }