along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: net.c,v 1.35.4.14 2000/06/29 17:09:05 guus Exp $
+ $Id: net.c,v 1.35.4.26 2000/08/09 14:02:16 guus Exp $
*/
#include "config.h"
int xsend(conn_list_t *cl, void *packet)
{
- int r;
real_packet_t rp;
cp
do_encrypt((vpn_packet_t*)packet, &rp, cl->key);
syslog(LOG_ERR, _("Sending packet of %d bytes to %s (%s)"),
ntohs(rp.len), cl->vpn_hostname, cl->real_hostname);
- if((r = send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
+ total_socket_out += ntohs(rp.len);
+
+ cl->want_ping = 1;
+
+ if((cl->flags | myself->flags) & TCPONLY)
+ return send_tcppacket(cl, (void*)&rp, ntohs(rp.len));
+
+ if((send(cl->socket, (char*)&rp, ntohs(rp.len), 0)) < 0)
{
syslog(LOG_ERR, _("Error sending packet to %s (%s): %m"),
cl->vpn_hostname, cl->real_hostname);
return -1;
}
-
- total_socket_out += r;
-
- cl->want_ping = 1;
cp
return 0;
}
return 0;
}
+int tcprecv(conn_list_t *cl, real_packet_t *rp)
+{
+ vpn_packet_t vp;
+ int lenin;
+ conn_list_t *f;
+cp
+ rp->data.len = ntohs(rp->data.len);
+ rp->len = ntohs(rp->len);
+ rp->from = ntohl(rp->from);
+
+ total_socket_in += rp->len;
+
+ if(rp->len >= 0)
+ {
+ f = lookup_conn(rp->from);
+ if(!f)
+ {
+ syslog(LOG_ERR, _("Got packet from %s (%s) with unknown origin %d.%d.%d.%d?"),
+ cl->vpn_hostname, cl->real_hostname, IP_ADDR_V(rp->from));
+ return -1;
+ }
+
+ if(f->status.validkey)
+ {
+ do_decrypt(rp, &vp, cl->key);
+ add_mac_addresses(&vp);
+
+ if(debug_lvl > 3)
+ syslog(LOG_ERR, _("Receiving packet of %d bytes from %s (%s)"),
+ rp->len, cl->vpn_hostname, cl->real_hostname);
+
+ 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;
+ }
+ else
+ {
+ add_queue(&(cl->sq), rp, rp->len + 2);
+ if(!cl->status.waitingforkey)
+ send_key_request(rp->from);
+ }
+
+ if(my_key_expiry <= time(NULL))
+ regenerate_keys();
+ }
+
+ cl->want_ping = 0;
+ cl->last_ping_time = time(NULL);
+cp
+ return 0;
+}
+
/*
add the given packet of size s to the
queue q, be it the send or receive queue
int nfd, flags;
struct sockaddr_in a;
const int one = 1;
+ config_t const *cfg;
cp
if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
{
return -1;
}
+ if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)))
+ {
+ syslog(LOG_ERR, _("setsockopt: %m"));
+ return -1;
+ }
+
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
return -1;
}
+ if((cfg = get_config_val(interface)))
+ {
+ if(setsockopt(nfd, SOL_SOCKET, SO_KEEPALIVE, cfg->data.ptr, strlen(cfg->data.ptr)))
+ {
+ syslog(LOG_ERR, _("Unable to bind listen socket to interface %s: %m"), cfg->data.ptr);
+ return -1;
+ }
+ }
+
memset(&a, 0, sizeof(a));
a.sin_family = AF_INET;
a.sin_port = htons(port);
- a.sin_addr.s_addr = htonl(INADDR_ANY);
+
+ if((cfg = get_config_val(interfaceip)))
+ a.sin_addr.s_addr = htonl(cfg->data.ip->ip);
+ else
+ a.sin_addr.s_addr = htonl(INADDR_ANY);
if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
{
cl->meta_socket = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if(cl->meta_socket == -1)
{
- syslog(LOG_ERR, _("Creating socket failed: %m"));
+ syslog(LOG_ERR, _("Creating socket for %s port %d failed: %m"),
+ cl->real_hostname, cl->port);
return -1;
}
flags = fcntl(cl->meta_socket, F_GETFL);
if(fcntl(cl->meta_socket, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, _("fcntl: %m"));
+ syslog(LOG_ERR, _("fcntl for %s port %d: %m"),
+ cl->real_hostname, cl->port);
return -1;
}
- syslog(LOG_INFO, _("Connected to %s port %hd"),
+ if(debug_lvl > 0)
+ syslog(LOG_INFO, _("Connected to %s port %hd"),
cl->real_hostname, cl->port);
cp
return 0;
an authentication sequence during which
we will do just that.
*/
-int setup_outgoing_connection(ip_t ip)
+int setup_outgoing_connection(char *hostname)
{
conn_list_t *ncn;
+ struct hostent *h;
cp
+ if(!(h = gethostbyname(hostname)))
+ {
+ syslog(LOG_ERR, _("Error looking up `%s': %m"), hostname);
+ return -1;
+ }
+
ncn = new_conn_list();
- ncn->real_ip = ip;
- ncn->real_hostname = hostlookup(htonl(ip));
+ ncn->real_ip = ntohl(*((ip_t*)(h->h_addr_list[0])));
+ ncn->real_hostname = hostlookup(htonl(ncn->real_ip));
if(setup_outgoing_meta_socket(ncn) < 0)
{
else
myself->port = cfg->data.val;
- if(cfg = get_config_val(indirectdata))
+ if((cfg = get_config_val(indirectdata)))
if(cfg->data.val == stupid_true)
myself->flags |= EXPORTINDIRECTDATA;
+ if((cfg = get_config_val(tcponly)))
+ if(cfg->data.val == stupid_true)
+ myself->flags |= TCPONLY;
+
if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
{
syslog(LOG_ERR, _("Unable to set up a listening socket"));
while(cfg)
{
- if(!setup_outgoing_connection(cfg->data.ip->ip)) /* function returns 0 when there are no problems */
+ if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
{
signal(SIGALRM, SIG_IGN);
return;
signal(SIGALRM, sigalrm_handler);
upstreamindex = 0;
seconds_till_retry += 5;
- if(seconds_till_retry>300) /* Don't wait more than 5 minutes. */
- seconds_till_retry = 300;
- alarm(seconds_till_retry);
+ if(seconds_till_retry > MAXTIMEOUT) /* Don't wait more than MAXTIMEOUT seconds. */
+ seconds_till_retry = MAXTIMEOUT;
syslog(LOG_ERR, _("Still failed to connect to other, will retry in %d seconds"),
seconds_till_retry);
+ alarm(seconds_till_retry);
cp
}
while(cfg)
{
- if(!setup_outgoing_connection(cfg->data.ip->ip)) /* function returns 0 when there are no problems */
+ if(!setup_outgoing_connection(cfg->data.ptr)) /* function returns 0 when there are no problems */
return 0;
cfg = get_next_config_val(upstreamip, upstreamindex++); /* Or else we try the next ConnectTo line */
}
signal(SIGALRM, sigalrm_handler);
upstreamindex = 0;
- seconds_till_retry = 300;
+ seconds_till_retry = MAXTIMEOUT;
+ syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in %d seconds"), seconds_till_retry);
alarm(seconds_till_retry);
- syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 minutes"));
cp
return 0;
}
flags = fcntl(nfd, F_GETFL);
if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
{
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, nfd);
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, nfd,
+ cl->vpn_hostname, cl->real_hostname);
return -1;
}
return NULL;
}
- p->vpn_hostname = _("unknown");
p->real_ip = ntohl(ci.sin_addr.s_addr);
p->real_hostname = hostlookup(ci.sin_addr.s_addr);
p->meta_socket = sfd;
if(send_basic_info(p) < 0)
{
- free(p);
+ free_conn_element(p);
return NULL;
}
cp
cp
if(getsockopt(cl->socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, cl->socket);
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, cl->socket,
+ cl->vpn_hostname, cl->real_hostname);
return -1;
}
if(x)
{
- syslog(LOG_ERR, _("Incoming data socket error: %s"), sys_errlist[x]);
+ syslog(LOG_ERR, _("Incoming data socket error for %s (%s): %s"),
+ cl->vpn_hostname, cl->real_hostname, sys_errlist[x]);
return -1;
}
lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL);
if(lenin <= 0)
{
- syslog(LOG_ERR, _("Receiving packet from %s failed: %m"), cl->real_hostname);
+ syslog(LOG_ERR, _("Receiving packet from %s (%s) failed: %m"), cl->vpn_hostname, cl->real_hostname);
return -1;
}
total_socket_in += lenin;
*/
void terminate_connection(conn_list_t *cl)
{
- conn_list_t *p, *q;
+ conn_list_t *p;
cp
if(cl->status.remove)
if(cl->status.timeout)
send_timeout(cl);
- else if(!cl->status.termreq)
+/* else if(!cl->status.termreq)
send_termreq(cl);
-
- close(cl->socket);
+ */
+
+ if(cl->socket)
+ close(cl->socket);
if(cl->status.meta)
close(cl->meta_socket);
- if(cl->status.outgoing)
- {
- signal(SIGALRM, sigalrm_handler);
- seconds_till_retry = 5;
- alarm(seconds_till_retry);
- syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds"));
- }
-
cl->status.remove = 1;
/* If this cl isn't active, don't send any DEL_HOSTs. */
- if(!cl->status.active)
- return;
+ if(cl->status.active)
+ notify_others(cl,NULL,send_del_host);
- cl->status.active = 0;
- notify_others(cl,NULL,send_del_host);
-
cp
/* Find all connections that were lost because they were behind cl
(the connection that was dropped). */
if(cl->status.meta)
for(p = conn_list; p != NULL; p = p->next)
{
- if(p->nexthop == cl)
+ if((p->nexthop == cl) && (p != cl))
{
- if(p->status.active)
+ if(cl->status.active && p->status.active)
notify_others(p,cl,send_del_host);
+ if(cl->socket)
+ close(cl->socket);
p->status.active = 0;
p->status.remove = 1;
}
}
-cp
- /* Then send a notification about all these connections to all hosts
- that are still connected to us.
- for(p = conn_list; p != NULL; p = p->next)
- if(p->status.active && p->status.meta)
- for(q = conn_list; q != NULL; q = q->next)
- if(q->status.remove)
- send_del_host(p, q);
- */
+ cl->status.active = 0;
+
+ if(cl->status.outgoing)
+ {
+ signal(SIGALRM, sigalrm_handler);
+ seconds_till_retry = 5;
+ alarm(seconds_till_retry);
+ syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds"));
+ }
cp
}
return -1;
}
- if((ncn = create_new_connection(nfd)) == NULL)
+ if(!(ncn = create_new_connection(nfd)))
{
shutdown(nfd, 2);
close(nfd);
cp
if(getsockopt(cl->meta_socket, SOL_SOCKET, SO_ERROR, &x, &l) < 0)
{
- syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m"), __FILE__, __LINE__, cl->meta_socket);
+ syslog(LOG_ERR, _("This is a bug: %s:%d: %d:%m %s (%s)"), __FILE__, __LINE__, cl->meta_socket,
+ cl->vpn_hostname, cl->real_hostname);
return -1;
}
if(x)
{
- syslog(LOG_ERR, _("Metadata socket error: %s"), sys_errlist[x]);
+ syslog(LOG_ERR, _("Metadata socket error for %s (%s): %s"),
+ cl->vpn_hostname, cl->real_hostname, sys_errlist[x]);
return -1;
}
return -1;
}
- lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
+ lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE - cl->buflen);
if(lenin<=0)
{
if(errno==EINTR)
return 0;
- syslog(LOG_ERR, _("Metadata socket read error: %m"));
+ if(errno==0)
+ {
+ if(debug_lvl>0)
+ syslog(LOG_NOTICE, _("Connection closed by %s (%s)"),
+ cl->vpn_hostname, cl->real_hostname);
+ }
+ else
+ syslog(LOG_ERR, _("Metadata socket read error for %s (%s): %m"),
+ cl->vpn_hostname, cl->real_hostname);
return -1;
}
for(;;)
{
- cl->reqlen = 0;
-
- for(i = oldlen; i < cl->buflen; i++)
+ if(cl->tcppacket)
{
- if(cl->buffer[i] == '\n')
+ if(cl->buflen >= cl->tcppacket)
+ {
+ tcprecv(cl, (real_packet_t *)cl->buffer);
+ cl->buflen -= cl->tcppacket;
+ memmove(cl->buffer, cl->buffer + cl->tcppacket, cl->buflen);
+ oldlen = 0;
+ cl->tcppacket=0;
+ }
+ else
{
- 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)
+ else
{
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Got request from %s (%s): %s"),
- cl->vpn_hostname, cl->real_hostname, cl->buffer);
- if(sscanf(cl->buffer, "%d", &request) == 1)
+ cl->reqlen = 0;
+
+ for(i = oldlen; i < cl->buflen; i++)
{
- if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
+ if(cl->buffer[i] == '\n')
{
- syslog(LOG_ERR, _("Unknown request from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
+ cl->buffer[i] = 0; /* replace end-of-line by end-of-string so we can use sscanf */
+ cl->reqlen = i + 1;
+ break;
}
+ }
- if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */
+ if(cl->reqlen)
+ {
+ if(debug_lvl > 2)
+ syslog(LOG_DEBUG, _("Got request from %s (%s): %s"),
+ cl->vpn_hostname, cl->real_hostname, cl->buffer);
+ if(sscanf(cl->buffer, "%d", &request) == 1)
+ {
+ if((request < 0) || (request > 255) || (request_handlers[request] == NULL))
+ {
+ syslog(LOG_ERR, _("Unknown request from %s (%s)"),
+ cl->vpn_hostname, cl->real_hostname);
+ return -1;
+ }
+
+ if(request_handlers[request](cl)) /* Something went wrong. Probably scriptkiddies. Terminate. */
+ {
+ syslog(LOG_ERR, _("Error while processing request from %s (%s)"),
+ cl->vpn_hostname, cl->real_hostname);
+ return -1;
+ }
+ }
+ else
{
- syslog(LOG_ERR, _("Error while processing request from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
+ syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
+ cl->vpn_hostname, cl->real_hostname);
return -1;
}
+
+ cl->buflen -= cl->reqlen;
+ memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
+ oldlen = 0;
}
else
{
- syslog(LOG_ERR, _("Bogus data received from %s (%s)"),
- cl->vpn_hostname, cl->real_hostname);
- return -1;
+ break;
}
-
- cl->buflen -= cl->reqlen;
- memmove(cl->buffer, cl->buffer + cl->reqlen, cl->buflen);
- oldlen = 0;
- }
- else
- {
- break;
}
}
if((r = select(FD_SETSIZE, &fset, NULL, NULL, &tv)) < 0)
{
- if(errno == EINTR) /* because of alarm */
- continue;
- syslog(LOG_ERR, _("Error while waiting for input: %m"));
- return;
+ if(errno != EINTR) /* because of alarm */
+ {
+ syslog(LOG_ERR, _("Error while waiting for input: %m"));
+ return;
+ }
+ }
+
+ if(sighup)
+ {
+ sighup = 0;
+ close_network_connections();
+ clear_config();
+ if(read_config_file(configfilename))
+ {
+ syslog(LOG_ERR, _("Unable to reread configuration file, exiting"));
+ exit(0);
+ }
+ sleep(5);
+ setup_network_connections();
+ continue;
}
if(last_ping_check + timeout < time(NULL))
{
check_dead_connections();
last_ping_check = time(NULL);
- continue;
}
- check_network_activity(&fset);
+ if(r > 0)
+ {
+ check_network_activity(&fset);
- /* local tap data */
- if(FD_ISSET(tap_fd, &fset))
- handle_tap_input();
+ /* local tap data */
+ if(FD_ISSET(tap_fd, &fset))
+ handle_tap_input();
+ }
}
cp
}