2 protocol_misc.c -- handle the meta-protocol, miscellaneous functions
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2009 Guus Sliepen <guus@tinc-vpn.org>
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License along
17 with this program; if not, write to the Free Software Foundation, Inc.,
18 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 #include "connection.h"
32 int maxoutbufsize = 0;
34 /* Status and error notification routines */
36 bool send_status(connection_t *c, int statusno, const char *statusstring) {
40 statusstring = "Status";
42 return send_request(c, "%d %d %s", STATUS, statusno, statusstring);
45 bool status_h(connection_t *c) {
47 char statusstring[MAX_STRING_SIZE];
51 if(sscanf(c->buffer, "%*d %d " MAX_STRING, &statusno, statusstring) != 2) {
52 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "STATUS",
53 c->name, c->hostname);
57 ifdebug(STATUS) logger(LOG_NOTICE, _("Status message from %s (%s): %d: %s"),
58 c->name, c->hostname, statusno, statusstring);
63 bool send_error(connection_t *c, int err, const char *errstring) {
69 return send_request(c, "%d %d %s", ERROR, err, errstring);
72 bool error_h(connection_t *c) {
74 char errorstring[MAX_STRING_SIZE];
78 if(sscanf(c->buffer, "%*d %d " MAX_STRING, &err, errorstring) != 2) {
79 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ERROR",
80 c->name, c->hostname);
84 ifdebug(ERROR) logger(LOG_NOTICE, _("Error message from %s (%s): %d: %s"),
85 c->name, c->hostname, err, errorstring);
87 terminate_connection(c, c->status.active);
92 bool send_termreq(connection_t *c) {
95 return send_request(c, "%d", TERMREQ);
98 bool termreq_h(connection_t *c) {
101 terminate_connection(c, c->status.active);
106 bool send_ping(connection_t *c) {
109 c->status.pinged = true;
110 c->last_ping_time = now;
112 return send_request(c, "%d", PING);
115 bool ping_h(connection_t *c) {
121 bool send_pong(connection_t *c) {
124 return send_request(c, "%d", PONG);
127 bool pong_h(connection_t *c) {
130 c->status.pinged = false;
132 /* Succesful connection, reset timeout if this is an outgoing connection. */
135 c->outgoing->timeout = 0;
140 /* Sending and receiving packets via TCP */
142 bool send_tcppacket(connection_t *c, vpn_packet_t *packet) {
145 /* If there already is a lot of data in the outbuf buffer, discard this packet.
146 We use a very simple Random Early Drop algorithm. */
148 if(2.0 * c->outbuflen / (float)maxoutbufsize - 1 > (float)rand()/(float)RAND_MAX)
151 if(!send_request(c, "%d %hd", PACKET, packet->len))
154 return send_meta(c, (char *)packet->data, packet->len);
157 bool tcppacket_h(connection_t *c) {
162 if(sscanf(c->buffer, "%*d %hd", &len) != 1) {
163 logger(LOG_ERR, _("Got bad %s from %s (%s)"), "PACKET", c->name,
168 /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */