/*
protocol_misc.c -- handle the meta-protocol, miscellaneous functions
- Copyright (C) 1999-2005 Ivo Timmermans <ivo@tinc-vpn.org>,
- 2000-2005 Guus Sliepen <guus@tinc-vpn.org>
+ Copyright (C) 1999-2005 Ivo Timmermans,
+ 2000-2009 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
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.
-
- $Id$
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.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)
-{
+bool send_status(connection_t *c, int statusno, const char *statusstring) {
cp();
if(!statusstring)
return send_request(c, "%d %d %s", STATUS, statusno, statusstring);
}
-bool status_h(connection_t *c)
-{
+bool status_h(connection_t *c) {
int statusno;
char statusstring[MAX_STRING_SIZE];
return true;
}
-bool send_error(connection_t *c, int err, const char *errstring)
-{
+bool send_error(connection_t *c, int err, const char *errstring) {
cp();
if(!errstring)
return send_request(c, "%d %d %s", ERROR, err, errstring);
}
-bool error_h(connection_t *c)
-{
+bool error_h(connection_t *c) {
int err;
char errorstring[MAX_STRING_SIZE];
return true;
}
-bool send_termreq(connection_t *c)
-{
+bool send_termreq(connection_t *c) {
cp();
return send_request(c, "%d", TERMREQ);
}
-bool termreq_h(connection_t *c)
-{
+bool termreq_h(connection_t *c) {
cp();
terminate_connection(c, c->status.active);
return true;
}
-bool send_ping(connection_t *c)
-{
+bool send_ping(connection_t *c) {
cp();
c->status.pinged = true;
return send_request(c, "%d", PING);
}
-bool ping_h(connection_t *c)
-{
+bool ping_h(connection_t *c) {
cp();
return send_pong(c);
}
-bool send_pong(connection_t *c)
-{
+bool send_pong(connection_t *c) {
cp();
return send_request(c, "%d", PONG);
}
-bool pong_h(connection_t *c)
-{
+bool pong_h(connection_t *c) {
cp();
c->status.pinged = false;
/* Sending and receiving packets via TCP */
-bool send_tcppacket(connection_t *c, vpn_packet_t *packet)
-{
+bool send_tcppacket(connection_t *c, vpn_packet_t *packet) {
cp();
- /* Evil hack. */
+ /* If there already is a lot of data in the outbuf buffer, discard this packet.
+ We use a very simple Random Early Drop algorithm. */
+
+ if(2.0 * c->outbuflen / (float)maxoutbufsize - 1 > (float)rand()/(float)RAND_MAX)
+ return true;
if(!send_request(c, "%d %hd", PACKET, packet->len))
return false;
- return send_meta(c, packet->data, packet->len);
+ return send_meta(c, (char *)packet->data, packet->len);
}
-bool tcppacket_h(connection_t *c)
-{
+bool tcppacket_h(connection_t *c) {
short int len;
cp();