2 protocol_misc.c -- handle the meta-protocol, miscellaneous functions
3 Copyright (C) 1999-2005 Ivo Timmermans,
4 2000-2012 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) {
38 statusstring = "Status";
41 return send_request(c, "%d %d %s", STATUS, statusno, statusstring);
44 bool status_h(connection_t *c) {
46 char statusstring[MAX_STRING_SIZE];
48 if(sscanf(c->buffer, "%*d %d " MAX_STRING, &statusno, statusstring) != 2) {
49 logger(LOG_ERR, "Got bad %s from %s (%s)", "STATUS",
50 c->name, c->hostname);
54 ifdebug(STATUS) logger(LOG_NOTICE, "Status message from %s (%s): %d: %s",
55 c->name, c->hostname, statusno, statusstring);
60 bool send_error(connection_t *c, int err, const char *errstring) {
65 return send_request(c, "%d %d %s", ERROR, err, errstring);
68 bool error_h(connection_t *c) {
70 char errorstring[MAX_STRING_SIZE];
72 if(sscanf(c->buffer, "%*d %d " MAX_STRING, &err, errorstring) != 2) {
73 logger(LOG_ERR, "Got bad %s from %s (%s)", "ERROR",
74 c->name, c->hostname);
78 ifdebug(ERROR) logger(LOG_NOTICE, "Error message from %s (%s): %d: %s",
79 c->name, c->hostname, err, errorstring);
81 terminate_connection(c, c->status.active);
86 bool send_termreq(connection_t *c) {
87 return send_request(c, "%d", TERMREQ);
90 bool termreq_h(connection_t *c) {
91 terminate_connection(c, c->status.active);
96 bool send_ping(connection_t *c) {
97 c->status.pinged = true;
98 c->last_ping_time = now;
100 return send_request(c, "%d", PING);
103 bool ping_h(connection_t *c) {
107 bool send_pong(connection_t *c) {
108 return send_request(c, "%d", PONG);
111 bool pong_h(connection_t *c) {
112 c->status.pinged = false;
114 /* Succesful connection, reset timeout if this is an outgoing connection. */
117 c->outgoing->timeout = 0;
118 c->outgoing->cfg = NULL;
120 if(c->outgoing->ai) {
121 freeaddrinfo(c->outgoing->ai);
124 c->outgoing->ai = NULL;
125 c->outgoing->aip = NULL;
131 /* Sending and receiving packets via TCP */
133 bool send_tcppacket(connection_t *c, const vpn_packet_t *packet) {
134 /* If there already is a lot of data in the outbuf buffer, discard this packet.
135 We use a very simple Random Early Drop algorithm. */
137 if(2.0 * c->outbuflen / (float)maxoutbufsize - 1 > (float)rand() / (float)RAND_MAX) {
141 if(!send_request(c, "%d %hd", PACKET, packet->len)) {
145 return send_meta(c, (char *)packet->data, packet->len) && flush_meta(c);
148 bool tcppacket_h(connection_t *c) {
151 if(sscanf(c->buffer, "%*d %hu", &len) != 1) {
152 logger(LOG_ERR, "Got bad %s from %s (%s)", "PACKET", c->name,
157 /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */