/*
net.c -- most of the network code
- Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com>
+ Copyright (C) 1998,1999,2000 Ivo Timmermans <zarq@iname.com>
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
int total_socket_in = 0;
int total_socket_out = 0;
-time_t last_ping_time = 0;
-
/* The global list of existing connections */
conn_list_t *conn_list = NULL;
conn_list_t *myself = NULL;
real_packet_t rp;
cp
do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
- rp.from = myself->vpn_ip;
+ rp.from = htonl(myself->vpn_ip);
+ rp.data.len = htons(rp.data.len);
+ rp.len = htons(rp.len);
if(debug_lvl > 3)
- syslog(LOG_ERR, "Sent %d bytes to %lx", rp.len, cl->vpn_ip);
+ syslog(LOG_ERR, "Sent %d bytes to %lx", ntohs(rp.len), cl->vpn_ip);
- if((r = send(cl->socket, (char*)&rp, rp.len, 0)) < 0)
+ if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
{
syslog(LOG_ERR, "Error sending data: %m");
return -1;
}
total_socket_out += r;
+
+ cl->want_ping = 1;
cp
return 0;
}
do_decrypt((real_packet_t*)packet, &vp, cl->key);
add_mac_addresses(&vp);
- if((lenin = write_n(tap_fd, &vp, vp.len + 2)) < 0)
+ if((lenin = write(tap_fd, &vp, vp.len + sizeof(vp.len))) < 0)
syslog(LOG_ERR, "Can't write to tap device: %m");
else
total_tap_out += lenin;
+
+ cl->want_ping = 0;
+ cl->last_ping_time = time(NULL);
cp
return 0;
}
return xsend(cl, packet);
}
-int send_broadcast(conn_list_t *cl, vpn_packet_t *packet)
-{
- conn_list_t *p;
-cp
- for(p = cl; p != NULL; p = p->next)
- if(send_packet(p->real_ip, packet) < 0)
- {
- syslog(LOG_ERR, "Could not send a broadcast packet to %08lx (%08lx): %m",
- p->vpn_ip, p->real_ip);
- break; /* FIXME: should retry later, and send a ping over the metaconnection. */
- }
-cp
- return 0;
-}
-
/*
open the local ethertap device
*/
config_t const *cfg;
cp
if((cfg = get_config_val(pingtimeout)) == NULL)
- timeout = 10;
+ timeout = 5;
else
timeout = cfg->data.val;
if(connect(nfd, (struct sockaddr *)&a, sizeof(a)) == -1)
{
- syslog(LOG_ERR, "Create connection to %08lx:%d failed: %m", ntohs(cl->real_ip),
- cl->port);
+ syslog(LOG_ERR, "Connecting to " IP_ADDR_S ":%d failed: %m",
+ IP_ADDR_V(cl->real_ip), cl->port);
return -1;
}
p->real_ip = ntohl(ci.sin_addr.s_addr);
p->meta_socket = sfd;
p->status.meta = 1;
-
+ p->buflen = 0;
+ p->last_ping_time = time(NULL);
+ p->want_ping = 0;
+
syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port));
if(send_basic_info(p) < 0)
return -1;
}
total_socket_in += lenin;
+
+ rp.data.len = ntohs(rp.data.len);
+ rp.len = ntohs(rp.len);
+ rp.from = ntohl(rp.from);
+
if(rp.len >= 0)
{
f = lookup_conn(rp.from);
}
/*
- send out a ping request to all active
- connections
-*/
-int send_broadcast_ping(void)
-{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- {
- if(p->status.remove)
- continue;
- if(p->status.active && p->status.meta)
- {
- if(send_ping(p))
- terminate_connection(p);
- else
- {
- p->status.pinged = 1;
- p->status.got_pong = 0;
- }
- }
- }
-
- last_ping_time = time(NULL);
-cp
- return 0;
-}
-
-/*
- end all connections that did not respond
- to the ping probe in time
+ Check if the other end is active.
+ If we have sent packets, but didn't receive any,
+ then possibly the other end is dead. We send a
+ PING request over the meta connection. If the other
+ end does not reply in time, we consider them dead
+ and close the connection.
*/
int check_dead_connections(void)
{
conn_list_t *p;
+ time_t now;
cp
+ now = time(NULL);
for(p = conn_list; p != NULL; p = p->next)
{
if(p->status.remove)
continue;
- if(p->status.active && p->status.meta && p->status.pinged && !p->status.got_pong)
+ if(p->status.active && p->status.meta)
{
- syslog(LOG_INFO, "%s (" IP_ADDR_S ") didn't respond to ping",
- p->hostname, IP_ADDR_V(p->vpn_ip));
- p->status.timeout = 1;
- terminate_connection(p);
+ if(p->last_ping_time + timeout < now)
+ {
+ if(p->status.pinged && !p->status.got_pong)
+ {
+ syslog(LOG_INFO, "%s (" IP_ADDR_S ") didn't respond to ping",
+ p->hostname, IP_ADDR_V(p->vpn_ip));
+ p->status.timeout = 1;
+ terminate_connection(p);
+ }
+ else if(p->want_ping)
+ {
+ send_ping(p);
+ p->last_ping_time = now;
+ p->status.pinged = 1;
+ p->status.got_pong = 0;
+ }
+ }
}
}
cp
*/
int handle_incoming_meta_data(conn_list_t *cl)
{
- int x, l = sizeof(x), lenin;
- unsigned char tmp[1600];
- int request;
+ int x, l = sizeof(x);
+ int request, oldlen, i;
+ int lenin = 0;
cp
if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
return -1;
}
- if((lenin = read(cl->meta_socket, &tmp, sizeof(tmp))) <= 0)
+ if(cl->buflen >= MAXBUFSIZE)
{
- syslog(LOG_ERR, "Receive failed: %m");
+ syslog(LOG_ERR, "Metadata read buffer full! Discarding contents.");
+ cl->buflen = 0;
+ }
+
+ lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
+
+ if(lenin<=0)
+ {
+ syslog(LOG_ERR, "Metadata socket read error: %m");
return -1;
}
- request = (int)(tmp[0]);
+ oldlen = cl->buflen;
+ cl->buflen += lenin;
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, "got request %d", request);
+ for(;;)
+ {
+ cl->reqlen = 0;
- if(request_handlers[request] == NULL)
- syslog(LOG_ERR, "Unknown request %d.", request);
- else
- if(request_handlers[request](cl, tmp, lenin) < 0)
- return -1;
+ for(i = oldlen; i < cl->buflen; i++)
+ {
+ if(cl->buffer[i] == '\n')
+ {
+ cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */
+ cl->reqlen = i + 1;
+ break;
+ }
+ }
+
+ if(cl->reqlen)
+ {
+ if(sscanf(cl->buffer, "%d", &request) == 1)
+ {
+ if(request_handlers[request] == NULL)
+ {
+ syslog(LOG_ERR, "Unknown request: %s", cl->buffer);
+ return 0;
+ }
+
+ if(debug_lvl > 3)
+ syslog(LOG_DEBUG, "Got request: %s", cl->buffer);
+
+ request_handlers[request](cl);
+ }
+ else
+ {
+ syslog(LOG_ERR, "Bogus data received: %s", cl->buffer);
+ }
+
+ cl->buflen -= cl->reqlen;
+ memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
+ oldlen = 0;
+ }
+ else
+ {
+ break;
+ }
+ }
+
+ cl->last_ping_time = time(NULL);
+ cl->want_ping = 0;
cp
return 0;
}
if(p->status.remove)
continue;
- if(p->status.active)
+ if(p->status.dataopen)
if(FD_ISSET(p->socket, f))
{
/*
}
/*
- this is where it al happens...
+ this is where it all happens...
*/
void main_loop(void)
{
fd_set fset;
struct timeval tv;
int r;
+ time_t last_ping_check;
cp
- last_ping_time = time(NULL);
+ last_ping_check = time(NULL);
for(;;)
{
return;
}
- if(r == 0 || last_ping_time + timeout < time(NULL))
- /* Timeout... hm... something might be wrong. */
+ if(last_ping_check + timeout < time(NULL))
+ /* Let's check if everybody is still alive */
{
check_dead_connections();
- send_broadcast_ping();
+ last_ping_check = time(NULL);
continue;
}
projects / tinc / blobdiff