151 lines
3.9 KiB
C
151 lines
3.9 KiB
C
/*
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protocol_misc.c -- handle the meta-protocol, miscellaneous functions
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Copyright (C) 1999-2005 Ivo Timmermans,
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2000-2012 Guus Sliepen <guus@tinc-vpn.org>
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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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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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You should have received a copy of the GNU General Public License along
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with this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "system.h"
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#include "conf.h"
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#include "connection.h"
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#include "logger.h"
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#include "meta.h"
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#include "net.h"
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#include "netutl.h"
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#include "protocol.h"
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#include "utils.h"
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int maxoutbufsize = 0;
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/* Status and error notification routines */
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bool send_status(connection_t *c, int statusno, const char *statusstring) {
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if(!statusstring)
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statusstring = "Status";
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return send_request(c, "%d %d %s", STATUS, statusno, statusstring);
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}
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bool status_h(connection_t *c, const char *request) {
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int statusno;
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char statusstring[MAX_STRING_SIZE];
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if(sscanf(request, "%*d %d " MAX_STRING, &statusno, statusstring) != 2) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "STATUS",
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c->name, c->hostname);
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return false;
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}
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logger(DEBUG_STATUS, LOG_NOTICE, "Status message from %s (%s): %d: %s",
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c->name, c->hostname, statusno, statusstring);
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return true;
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}
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bool send_error(connection_t *c, int err, const char *errstring) {
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if(!errstring)
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errstring = "Error";
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return send_request(c, "%d %d %s", ERROR, err, errstring);
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}
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bool error_h(connection_t *c, const char *request) {
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int err;
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char errorstring[MAX_STRING_SIZE];
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if(sscanf(request, "%*d %d " MAX_STRING, &err, errorstring) != 2) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ERROR",
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c->name, c->hostname);
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return false;
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}
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logger(DEBUG_ERROR, LOG_NOTICE, "Error message from %s (%s): %d: %s",
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c->name, c->hostname, err, errorstring);
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return false;
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}
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bool send_termreq(connection_t *c) {
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return send_request(c, "%d", TERMREQ);
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}
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bool termreq_h(connection_t *c, const char *request) {
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return false;
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}
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bool send_ping(connection_t *c) {
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c->status.pinged = true;
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c->last_ping_time = time(NULL);
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return send_request(c, "%d", PING);
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}
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bool ping_h(connection_t *c, const char *request) {
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return send_pong(c);
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}
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bool send_pong(connection_t *c) {
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return send_request(c, "%d", PONG);
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}
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bool pong_h(connection_t *c, const char *request) {
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c->status.pinged = false;
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/* Succesful connection, reset timeout if this is an outgoing connection. */
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if(c->outgoing) {
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c->outgoing->timeout = 0;
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c->outgoing->cfg = NULL;
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if(c->outgoing->ai)
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freeaddrinfo(c->outgoing->ai);
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c->outgoing->ai = NULL;
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c->outgoing->aip = NULL;
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}
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return true;
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}
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/* Sending and receiving packets via TCP */
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bool send_tcppacket(connection_t *c, const vpn_packet_t *packet) {
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/* If there already is a lot of data in the outbuf buffer, discard this packet.
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We use a very simple Random Early Drop algorithm. */
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if(2.0 * c->outbuf.len / (float)maxoutbufsize - 1 > (float)rand()/(float)RAND_MAX)
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return true;
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if(!send_request(c, "%d %hd", PACKET, packet->len))
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return false;
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return send_meta(c, (char *)packet->data, packet->len);
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}
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bool tcppacket_h(connection_t *c, const char *request) {
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short int len;
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if(sscanf(request, "%*d %hd", &len) != 1) {
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logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "PACKET", c->name,
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c->hostname);
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return false;
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}
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/* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */
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c->tcplen = len;
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return true;
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}
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