X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet.c;h=31acd38900a0939d45e73e5f02326314b19f5407;hp=ec28d6a9f967e0d98400f3fc67e207d1386db312;hb=783c8298610d5670f6e118f49bd3d1fdfa61ae1d;hpb=b50523dc44bbb32f03d24573e195c071cbff3fc4

diff --git a/src/net.c b/src/net.c
index ec28d6a9..31acd389 100644
--- a/src/net.c
+++ b/src/net.c
@@ -1,6 +1,7 @@
 /*
     net.c -- most of the network code
-    Copyright (C) 1998,99 Ivo Timmermans <zarq@iname.com>
+    Copyright (C) 1998,1999,2000 Ivo Timmermans <itimmermans@bigfoot.com>,
+                            2000 Guus Sliepen <guus@sliepen.warande.net>
 
     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
@@ -15,6 +16,8 @@
     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: net.c,v 1.35.4.7 2000/06/26 19:39:34 guus Exp $
 */
 
 #include "config.h"
@@ -44,6 +47,8 @@
 #include "netutl.h"
 #include "protocol.h"
 
+#include "system.h"
+
 int tap_fd = -1;
 
 int total_tap_in = 0;
@@ -51,7 +56,7 @@ int total_tap_out = 0;
 int total_socket_in = 0;
 int total_socket_out = 0;
 
-time_t last_ping_time = 0;
+static int seconds_till_retry;
 
 /* The global list of existing connections */
 conn_list_t *conn_list = NULL;
@@ -63,10 +68,11 @@ conn_list_t *myself = NULL;
 void strip_mac_addresses(vpn_packet_t *p)
 {
   unsigned char tmp[MAXSIZE];
-
+cp
   memcpy(tmp, p->data, p->len);
   p->len -= 12;
   memcpy(p->data, &tmp[12], p->len);
+cp
 }
 
 /*
@@ -75,7 +81,7 @@ void strip_mac_addresses(vpn_packet_t *p)
 void add_mac_addresses(vpn_packet_t *p)
 {
   unsigned char tmp[MAXSIZE];
-
+cp
   memcpy(&tmp[12], p->data, p->len);
   p->len += 12;
   tmp[0] = tmp[6] = 0xfe;
@@ -83,63 +89,57 @@ void add_mac_addresses(vpn_packet_t *p)
   *((ip_t*)(&tmp[2])) = (ip_t)(htonl(myself->vpn_ip));
   *((ip_t*)(&tmp[8])) = *((ip_t*)(&tmp[26]));
   memcpy(p->data, &tmp[0], p->len);
+cp
 }
 
 int xsend(conn_list_t *cl, void *packet)
 {
   int r;
   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, _("Sending packet of %d bytes to " IP_ADDR_S " (%s)"),
+           ntohs(rp.len), IP_ADDR_V(cl->vpn_ip), cl->hostname);
 
-  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");
+      syslog(LOG_ERR, _("Error sending packet to " IP_ADDR_S " (%s): %m"),
+             IP_ADDR_V(cl->vpn_ip), cl->hostname);
       return -1;
     }
 
   total_socket_out += r;
 
+  cl->want_ping = 1;
+cp
   return 0;
 }
 
-/*
-  write as many bytes as possible to the tap
-  device, possibly in multiple turns.
-*/
-int write_n(int fd, void *buf, size_t len)
-{
-  int r, done = 0;
-  
-  do
-    {
-      if((r = write(fd, buf, len)) < 0)
-	return -1;
-      len -= r;
-      buf += r;
-      done += r;
-    } while(len > 0);
-
-  return done;
-}
-
 int xrecv(conn_list_t *cl, void *packet)
 {
   vpn_packet_t vp;
   int lenin;
-
+cp
   do_decrypt((real_packet_t*)packet, &vp, cl->key);
   add_mac_addresses(&vp);
 
-  if((lenin = write_n(tap_fd, &vp, vp.len + 2)) < 0)
-    syslog(LOG_ERR, "Can't write to tap device: %m");
+  if(debug_lvl > 3)
+    syslog(LOG_ERR, _("Receiving packet of %d bytes from " IP_ADDR_S " (%s)"),
+           ((real_packet_t*)packet)->len, IP_ADDR_V(cl->vpn_ip), cl->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;
 
+  cl->want_ping = 0;
+  cl->last_ping_time = time(NULL);
+cp
   return 0;
 }
 
@@ -149,29 +149,70 @@ int xrecv(conn_list_t *cl, void *packet)
 */
 void add_queue(packet_queue_t **q, void *packet, size_t s)
 {
-  queue_element_t *e, *p;
-
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "packet to queue: %d", s);
-
-  e = xmalloc(sizeof(queue_element_t));
+  queue_element_t *e;
+cp
+  e = xmalloc(sizeof(*e));
   e->packet = xmalloc(s);
   memcpy(e->packet, packet, s);
+
   if(!*q)
     {
-      *q = xmalloc(sizeof(packet_queue_t));
+      *q = xmalloc(sizeof(**q));
       (*q)->head = (*q)->tail = NULL;
     }
 
-  e->next = NULL;
+  e->next = NULL;			/* We insert at the tail */
 
-  if((*q)->tail != NULL)
-    (*q)->tail->next = e;
+  if((*q)->tail)			/* Do we have a tail? */
+    {
+      (*q)->tail->next = e;
+      e->prev = (*q)->tail;
+    }
+  else					/* No tail -> no head too */
+    {
+      (*q)->head = e;
+      e->prev = NULL;
+    }
 
   (*q)->tail = e;
+cp
+}
 
-  if((*q)->head == NULL)
-    (*q)->head = e;
+/* Remove a queue element */
+void del_queue(packet_queue_t **q, queue_element_t *e)
+{
+cp
+  free(e->packet);
+
+  if(e->next)				/* There is a successor, so we are not tail */
+    {
+      if(e->prev)			/* There is a predecessor, so we are not head */
+        {
+          e->next->prev = e->prev;
+          e->prev->next = e->next;
+        }
+      else				/* We are head */
+        {
+          e->next->prev = NULL;
+          (*q)->head = e->next;
+        }
+    }
+  else					/* We are tail (or all alone!) */
+    {          
+      if(e->prev)			/* We are not alone :) */
+        {
+          e->prev->next = NULL;
+          (*q)->tail = e->prev;
+        }
+      else				/* Adieu */
+        {
+          free(*q);
+          *q = NULL;
+        }
+    }
+    
+  free(e);
+cp
 }
 
 /*
@@ -179,38 +220,24 @@ void add_queue(packet_queue_t **q, void *packet, size_t s)
   each packet, and removing it when that
   returned a zero exit code
 */
-void flush_queue(conn_list_t *cl, packet_queue_t *pq,
+void flush_queue(conn_list_t *cl, packet_queue_t **pq,
 		 int (*function)(conn_list_t*,void*))
 {
-  queue_element_t *p, *prev = NULL, *next = NULL;
-
-  for(p = pq->head; p != NULL; )
+  queue_element_t *p, *next = NULL;
+cp
+  for(p = (*pq)->head; p != NULL; )
     {
       next = p->next;
 
-cp
       if(!function(cl, p->packet))
-        {
-          if(prev)
-            prev->next = next;
-          else
-            pq->head = next;
-
-cp
-          free(p->packet);
-cp
-	  free(p);
-cp
-        }
-      else
-        prev = p;
-cp
-
+        del_queue(pq, p);
+        
       p = next;
     }
 
   if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "queue flushed");
+    syslog(LOG_DEBUG, _("Queue flushed"));
+cp
 }
 
 /*
@@ -223,19 +250,18 @@ void flush_queues(conn_list_t *cl)
 cp
   if(cl->sq)
     {
-      if(debug_lvl > 1)
-	syslog(LOG_DEBUG, "Flushing send queue for " IP_ADDR_S,
+      if(debug_lvl > 3)
+	syslog(LOG_DEBUG, _("Flushing send queue for " IP_ADDR_S),
 	       IP_ADDR_V(cl->vpn_ip));
-      flush_queue(cl, cl->sq, xsend);
+      flush_queue(cl, &(cl->sq), xsend);
     }
-cp
 
   if(cl->rq)
     {
-      if(debug_lvl > 1)
-	syslog(LOG_DEBUG, "Flushing receive queue for " IP_ADDR_S,
+      if(debug_lvl > 3)
+	syslog(LOG_DEBUG, _("Flushing receive queue for " IP_ADDR_S),
 	       IP_ADDR_V(cl->vpn_ip));
-      flush_queue(cl, cl->rq, xrecv);
+      flush_queue(cl, &(cl->rq), xrecv);
     }
 cp
 }
@@ -246,47 +272,96 @@ cp
 int send_packet(ip_t to, vpn_packet_t *packet)
 {
   conn_list_t *cl;
-
+cp
   if((cl = lookup_conn(to)) == NULL)
     {
-      if(debug_lvl > 2)
+      if(debug_lvl > 3)
         {
-          syslog(LOG_NOTICE, "trying to look up " IP_ADDR_S " in connection list failed.",
+          syslog(LOG_NOTICE, _("Trying to look up " IP_ADDR_S " in connection list failed!"),
 	         IP_ADDR_V(to));
         }
+        
+      /* Is this really necessary? If we can't find "to", then neither should any uplink. (GS) */
+      
+      return -1;
+        
+      for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
+      if(!cl)
+        { /* No open outgoing connection has been found. */
+	  if(debug_lvl > 3)
+	    syslog(LOG_NOTICE, _("There is no remote host I can send this packet to!"));
+          return -1;
+        }
+    }
+    
+  /* If we ourselves have indirectdata flag set, we should send only to our uplink! */
+  
+  if(myself->flags & EXPORTINDIRECTDATA)
+    {
       for(cl = conn_list; cl != NULL && !cl->status.outgoing; cl = cl->next);
       if(!cl)
         { /* No open outgoing connection has been found. */
-	  if(debug_lvl > 2)
-	    syslog(LOG_NOTICE, "There is no remote host I can send this packet to.");
+	  if(debug_lvl > 3)
+	    syslog(LOG_NOTICE, _("There is no remote host I can send this packet to!"));
           return -1;
         }
     }
+  else
+
+  /* If indirectdata flag is set for the destination we just looked up,
+   * then real_ip is actually the vpn_ip of the gateway tincd
+   * it is behind.
+   */
+   
+  if(cl->flags & INDIRECTDATA)
+    {
+      if(debug_lvl > 3)
+        syslog(LOG_NOTICE, _("Indirect packet to " IP_ADDR_S " via " IP_ADDR_S),
+               IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->real_ip));
+      if((cl = lookup_conn(cl->real_ip)) == NULL)
+        {
+          if(debug_lvl > 3)
+              syslog(LOG_NOTICE, _("Indirect look up " IP_ADDR_S " in connection list failed!"),
+	             IP_ADDR_V(to));
+            
+          /* Gateway tincd dead? Should we kill it? (GS) */
+
+          return -1;
+        }
+      if(cl->flags & INDIRECTDATA)  /* This should not happen */
+        {
+          if(debug_lvl > 3)
+              syslog(LOG_NOTICE, _("Double indirection for " IP_ADDR_S),
+	             IP_ADDR_V(to));
+          return -1;        
+        }
+    }            
 
-cp
   if(my_key_expiry <= time(NULL))
     regenerate_keys();
 
-cp
   if(!cl->status.dataopen)
     if(setup_vpn_connection(cl) < 0)
-      return -1;
-cp
-
+      {
+        syslog(LOG_ERR, _("Could not open UDP connection to " IP_ADDR_S " (%s)"), IP_ADDR_V(cl->vpn_ip), cl->hostname);
+        return -1;
+      }
+      
   if(!cl->status.validkey)
     {
+      if(debug_lvl > 3)
+	syslog(LOG_INFO, _(IP_ADDR_S " (%s) has no valid key, queueing packet"), IP_ADDR_V(cl->vpn_ip), cl->hostname);
       add_queue(&(cl->sq), packet, packet->len + 2);
       if(!cl->status.waitingforkey)
-	send_key_request(to);
+	send_key_request(cl->vpn_ip);			/* Keys should be sent to the host running the tincd */
       return 0;
     }
 
-cp
   if(!cl->status.active)
     {
+      if(debug_lvl > 3)
+	syslog(LOG_INFO, _(IP_ADDR_S " (%s) is not ready, queueing packet"), IP_ADDR_V(cl->vpn_ip), cl->hostname);
       add_queue(&(cl->sq), packet, packet->len + 2);
-      if(debug_lvl > 1)
-	syslog(LOG_INFO, IP_ADDR_S " is not ready, queueing packet.", IP_ADDR_V(cl->vpn_ip));
       return 0; /* We don't want to mess up, do we? */
     }
 
@@ -295,21 +370,6 @@ cp
   return xsend(cl, packet);
 }
 
-int send_broadcast(conn_list_t *cl, vpn_packet_t *packet)
-{
-  conn_list_t *p;
-
-  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. */
-      }
-
-  return 0;
-}
-
 /*
   open the local ethertap device
 */
@@ -318,7 +378,7 @@ int setup_tap_fd(void)
   int nfd;
   const char *tapfname;
   config_t const *cfg;
-  
+cp  
   if((cfg = get_config_val(tapdevice)) == NULL)
     tapfname = "/dev/tap0";
   else
@@ -326,11 +386,12 @@ int setup_tap_fd(void)
 
   if((nfd = open(tapfname, O_RDWR | O_NONBLOCK)) < 0)
     {
-      syslog(LOG_ERR, "Could not open %s: %m", tapfname);
+      syslog(LOG_ERR, _("Could not open %s: %m"), tapfname);
       return -1;
     }
 
   tap_fd = nfd;
+cp
   return 0;
 }
 
@@ -343,23 +404,23 @@ int setup_listen_meta_socket(int port)
   int nfd, flags;
   struct sockaddr_in a;
   const int one = 1;
-
+cp
   if((nfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
     {
-      syslog(LOG_ERR, "Creating metasocket failed: %m");
+      syslog(LOG_ERR, _("Creating metasocket failed: %m"));
       return -1;
     }
 
   if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
     {
-      syslog(LOG_ERR, "setsockopt: %m");
+      syslog(LOG_ERR, _("setsockopt: %m"));
       return -1;
     }
 
   flags = fcntl(nfd, F_GETFL);
   if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
     {
-      syslog(LOG_ERR, "fcntl: %m");
+      syslog(LOG_ERR, _("fcntl: %m"));
       return -1;
     }
 
@@ -370,16 +431,16 @@ int setup_listen_meta_socket(int port)
 
   if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
     {
-      syslog(LOG_ERR, "Can't bind to port %hd/tcp: %m", port);
+      syslog(LOG_ERR, _("Can't bind to port %hd/tcp: %m"), port);
       return -1;
     }
 
   if(listen(nfd, 3))
     {
-      syslog(LOG_ERR, "listen: %m");
+      syslog(LOG_ERR, _("listen: %m"));
       return -1;
     }
-
+cp
   return nfd;
 }
 
@@ -392,23 +453,23 @@ int setup_vpn_in_socket(int port)
   int nfd, flags;
   struct sockaddr_in a;
   const int one = 1;
-
+cp
   if((nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0)
     {
-      syslog(LOG_ERR, "Creating socket failed: %m");
+      syslog(LOG_ERR, _("Creating socket failed: %m"));
       return -1;
     }
 
   if(setsockopt(nfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(one)))
     {
-      syslog(LOG_ERR, "setsockopt: %m");
+      syslog(LOG_ERR, _("setsockopt: %m"));
       return -1;
     }
 
   flags = fcntl(nfd, F_GETFL);
   if(fcntl(nfd, F_SETFL, flags | O_NONBLOCK) < 0)
     {
-      syslog(LOG_ERR, "fcntl: %m");
+      syslog(LOG_ERR, _("fcntl: %m"));
       return -1;
     }
 
@@ -419,10 +480,10 @@ int setup_vpn_in_socket(int port)
 
   if(bind(nfd, (struct sockaddr *)&a, sizeof(struct sockaddr)))
     {
-      syslog(LOG_ERR, "Can't bind to port %hd/udp: %m", port);
+      syslog(LOG_ERR, _("Can't bind to port %hd/udp: %m"), port);
       return -1;
     }
-
+cp
   return nfd;
 }
 
@@ -434,7 +495,7 @@ int setup_outgoing_meta_socket(conn_list_t *cl)
   int flags;
   struct sockaddr_in a;
   config_t const *cfg;
-
+cp
   if((cfg = get_config_val(upstreamport)) == NULL)
     cl->port = 655;
   else
@@ -443,7 +504,7 @@ int setup_outgoing_meta_socket(conn_list_t *cl)
   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 failed: %m"));
       return -1;
     }
 
@@ -453,21 +514,20 @@ int setup_outgoing_meta_socket(conn_list_t *cl)
 
   if(connect(cl->meta_socket, (struct sockaddr *)&a, sizeof(a)) == -1)
     {
-      syslog(LOG_ERR, IP_ADDR_S ":%d: %m", IP_ADDR_V(cl->real_ip), cl->port);
+      syslog(LOG_ERR, _(IP_ADDR_S ":%d: %m"), IP_ADDR_V(cl->real_ip), 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: %m"));
       return -1;
     }
 
-  cl->hostname = hostlookup(htonl(cl->real_ip));
-
-  syslog(LOG_INFO, "Connected to %s:%hd" , cl->hostname, cl->port);
-
+  syslog(LOG_INFO, _("Connected to " IP_ADDR_S ":%hd"),
+         IP_ADDR_V(cl->real_ip), cl->port);
+cp
   return 0;
 }
 
@@ -481,13 +541,14 @@ int setup_outgoing_meta_socket(conn_list_t *cl)
 int setup_outgoing_connection(ip_t ip)
 {
   conn_list_t *ncn;
-
+cp
   ncn = new_conn_list();
   ncn->real_ip = ip;
-
+  ncn->hostname = hostlookup(htonl(ip));
+  
   if(setup_outgoing_meta_socket(ncn) < 0)
     {
-      syslog(LOG_ERR, "Could not set up a meta connection.");
+      syslog(LOG_ERR, _("Could not set up a meta connection!"));
       free_conn_element(ncn);
       return -1;
     }
@@ -496,7 +557,7 @@ int setup_outgoing_connection(ip_t ip)
   ncn->status.outgoing = 1;
   ncn->next = conn_list;
   conn_list = ncn;
-
+cp
   return 0;
 }
 
@@ -506,52 +567,82 @@ int setup_outgoing_connection(ip_t ip)
 int setup_myself(void)
 {
   config_t const *cfg;
-
+cp
   myself = new_conn_list();
 
   if(!(cfg = get_config_val(myvpnip)))
     {
-      syslog(LOG_ERR, "No value for my VPN IP given");
+      syslog(LOG_ERR, _("No value for my VPN IP given"));
       return -1;
     }
 
   myself->vpn_ip = cfg->data.ip->ip;
+  myself->hostname = hostlookup(htonl(myself->vpn_ip));
   myself->vpn_mask = cfg->data.ip->mask;
+  myself->flags = 0;
 
   if(!(cfg = get_config_val(listenport)))
     myself->port = 655;
   else
     myself->port = cfg->data.val;
 
+  if(cfg = get_config_val(indirectdata))
+    if(cfg->data.val)
+      myself->flags |= EXPORTINDIRECTDATA;
+
   if((myself->meta_socket = setup_listen_meta_socket(myself->port)) < 0)
     {
-      syslog(LOG_ERR, "Unable to set up a listening socket");
+      syslog(LOG_ERR, _("Unable to set up a listening socket"));
       return -1;
     }
 
   if((myself->socket = setup_vpn_in_socket(myself->port)) < 0)
     {
-      syslog(LOG_ERR, "Unable to set up an incoming vpn data socket");
+      syslog(LOG_ERR, _("Unable to set up an incoming vpn data socket"));
       close(myself->meta_socket);
       return -1;
     }
 
   myself->status.active = 1;
 
-  syslog(LOG_NOTICE, "Ready: listening on port %d.", myself->port);
-
+  syslog(LOG_NOTICE, _("Ready: listening on port %d"), myself->port);
+cp
   return 0;
 }
 
+RETSIGTYPE
+sigalrm_handler(int a)
+{
+  config_t const *cfg;
+cp
+  cfg = get_config_val(upstreamip);
+
+  if(!setup_outgoing_connection(cfg->data.ip->ip))
+    {
+      signal(SIGALRM, SIG_IGN);
+    }
+  else
+    {
+      signal(SIGALRM, sigalrm_handler);
+      seconds_till_retry += 5;
+      if(seconds_till_retry>300)    /* Don't wait more than 5 minutes. */
+        seconds_till_retry = 300;
+      alarm(seconds_till_retry);
+      syslog(LOG_ERR, _("Still failed to connect to other, will retry in %d seconds"),
+	     seconds_till_retry);
+    }
+cp
+}
+
 /*
   setup all initial network connections
 */
 int setup_network_connections(void)
 {
   config_t const *cfg;
-
+cp
   if((cfg = get_config_val(pingtimeout)) == NULL)
-    timeout = 10;
+    timeout = 5;
   else
     timeout = cfg->data.val;
 
@@ -566,32 +657,14 @@ int setup_network_connections(void)
     return 0;
 
   if(setup_outgoing_connection(cfg->data.ip->ip))
-    return -1;
-
-  return 0;
-}
-
-RETSIGTYPE
-sigalrm_handler(int a)
-{
-  config_t const *cfg;
-  static int seconds_till_retry;
-
-  cfg = get_config_val(upstreamip);
-
-  if(!setup_outgoing_connection(cfg->data.ip->ip))
-    {
-      signal(SIGALRM, SIG_IGN);
-      seconds_till_retry = 5;
-    }
-  else
     {
       signal(SIGALRM, sigalrm_handler);
-      seconds_till_retry += 5;
+      seconds_till_retry = 300;
       alarm(seconds_till_retry);
-      syslog(LOG_ERR, "Still failed to connect to other. Will retry in %d seconds.",
-	     seconds_till_retry);
+      syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 minutes"));
     }
+cp
+  return 0;
 }
 
 /*
@@ -600,7 +673,7 @@ sigalrm_handler(int a)
 void close_network_connections(void)
 {
   conn_list_t *p;
-
+cp
   for(p = conn_list; p != NULL; p = p->next)
     {
       if(p->status.dataopen)
@@ -626,7 +699,8 @@ void close_network_connections(void)
   close(tap_fd);
   destroy_conn_list();
 
-  syslog(LOG_NOTICE, "Terminating.");
+  syslog(LOG_NOTICE, _("Terminating"));
+cp
   return;
 }
 
@@ -637,14 +711,14 @@ int setup_vpn_connection(conn_list_t *cl)
 {
   int nfd, flags;
   struct sockaddr_in a;
-
-  if(debug_lvl > 1)
-    syslog(LOG_DEBUG, "Opening UDP socket to " IP_ADDR_S, IP_ADDR_V(cl->real_ip));
+cp
+  if(debug_lvl > 0)
+    syslog(LOG_DEBUG, _("Opening UDP socket to %s"), cl->hostname);
 
   nfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
   if(nfd == -1)
     {
-      syslog(LOG_ERR, "Creating data socket failed: %m");
+      syslog(LOG_ERR, _("Creating UDP socket failed: %m"));
       return -1;
     }
 
@@ -654,21 +728,21 @@ int setup_vpn_connection(conn_list_t *cl)
 
   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 %s port %d failed: %m"),
+	     cl->hostname, cl->port);
       return -1;
     }
 
   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"), __FILE__, __LINE__, nfd);
       return -1;
     }
 
   cl->socket = nfd;
   cl->status.dataopen = 1;
-
+cp
   return 0;
 }
 
@@ -681,28 +755,32 @@ conn_list_t *create_new_connection(int sfd)
   conn_list_t *p;
   struct sockaddr_in ci;
   int len = sizeof(ci);
-
+cp
   p = new_conn_list();
 
   if(getpeername(sfd, &ci, &len) < 0)
     {
-      syslog(LOG_ERR, "Error: getpeername: %m");
+      syslog(LOG_ERR, _("Error: getpeername: %m"));
       return NULL;
     }
 
-  p->hostname = hostlookup(ci.sin_addr.s_addr);
   p->real_ip = ntohl(ci.sin_addr.s_addr);
+  p->hostname = hostlookup(ci.sin_addr.s_addr);
   p->meta_socket = sfd;
   p->status.meta = 1;
-
-  syslog(LOG_NOTICE, "Connection from %s:%d", p->hostname, htons(ci.sin_port));
+  p->buflen = 0;
+  p->last_ping_time = time(NULL);
+  p->want_ping = 0;
+  
+  syslog(LOG_NOTICE, _("Connection from %s port %d"),
+         p->hostname, htons(ci.sin_port));
 
   if(send_basic_info(p) < 0)
     {
       free(p);
       return NULL;
     }
-
+cp
   return p;
 }
 
@@ -712,7 +790,7 @@ conn_list_t *create_new_connection(int sfd)
 void build_fdset(fd_set *fs)
 {
   conn_list_t *p;
-
+cp
   FD_ZERO(fs);
 
   for(p = conn_list; p != NULL; p = p->next)
@@ -726,6 +804,7 @@ void build_fdset(fd_set *fs)
   FD_SET(myself->meta_socket, fs);
   FD_SET(myself->socket, fs);
   FD_SET(tap_fd, fs);
+cp
 }
 
 /*
@@ -739,15 +818,15 @@ int handle_incoming_vpn_data(conn_list_t *cl)
   int lenin;
   int x, l = sizeof(x);
   conn_list_t *f;
-
+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"), __FILE__, __LINE__, cl->socket);
       return -1;
     }
   if(x)
     {
-      syslog(LOG_ERR, "Incoming data socket error: %s", sys_errlist[x]);
+      syslog(LOG_ERR, _("Incoming data socket error: %s"), sys_errlist[x]);
       return -1;
     }
 
@@ -755,20 +834,22 @@ int handle_incoming_vpn_data(conn_list_t *cl)
   lenin = recvfrom(cl->socket, &rp, MTU, 0, NULL, NULL);
   if(lenin <= 0)
     {
-      syslog(LOG_ERR, "Receiving data failed: %m");
+      syslog(LOG_ERR, _("Receiving packet from %s failed: %m"), cl->hostname);
       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);
-      if(debug_lvl > 2)
-	syslog(LOG_DEBUG, "packet from " IP_ADDR_S " (len %d)",
-	       IP_ADDR_V(rp.from), rp.len);
       if(!f)
 	{
-	  syslog(LOG_ERR, "Got packet from unknown source " IP_ADDR_S,
-		 IP_ADDR_V(rp.from));
+	  syslog(LOG_ERR, _("Got packet from " IP_ADDR_S " (%s) with unknown origin " IP_ADDR_S "?"),
+		 IP_ADDR_V(cl->vpn_ip), cl->hostname, IP_ADDR_V(rp.from));
 	  return -1;
 	}
 
@@ -784,7 +865,7 @@ int handle_incoming_vpn_data(conn_list_t *cl)
       if(my_key_expiry <= time(NULL))
 	regenerate_keys();
     }
-
+cp
   return 0;
 }
 
@@ -794,11 +875,15 @@ int handle_incoming_vpn_data(conn_list_t *cl)
 */
 void terminate_connection(conn_list_t *cl)
 {
+  conn_list_t *p, *q;
+
+cp
   if(cl->status.remove)
     return;
 
   if(debug_lvl > 0)
-    syslog(LOG_NOTICE, "Closing connection with %s.", cl->hostname);
+    syslog(LOG_NOTICE, _("Closing connection with " IP_ADDR_S " (%s)"),
+           IP_ADDR_V(cl->vpn_ip), cl->hostname);
 
   if(cl->status.timeout)
     send_timeout(cl);
@@ -811,64 +896,78 @@ void terminate_connection(conn_list_t *cl)
 
   if(cl->status.outgoing)
     {
-      alarm(5);
       signal(SIGALRM, sigalrm_handler);
-      syslog(LOG_NOTICE, "Try to re-establish outgoing connection in 5 seconds.");
+      seconds_till_retry = 5;
+      alarm(seconds_till_retry);
+      syslog(LOG_NOTICE, _("Trying to re-establish outgoing connection in 5 seconds"));
     }
   
+  cl->status.active = 0;
   cl->status.remove = 1;
-}
-
-/*
-  send out a ping request to all active
-  connections
-*/
-int send_broadcast_ping(void)
-{
-  conn_list_t *p;
 
+cp
+  /* Find all connections that were lost because they were behind cl
+     (the connection that was dropped). */
   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;
-	    }
-	}
-    }
+    if(p->nexthop == cl)
+      {
+	p->status.active = 0;
+	p->status.remove = 1;
+      }
 
-  last_ping_time = time(NULL);
+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.remove && p->status.meta)
+      for(q = conn_list; q != NULL; q = q->next)
+	if(q->status.remove)
+	  send_del_host(p, q);
 
-  return 0;
+cp
 }
 
 /*
-  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)
+                {
+                  if(debug_lvl > 1)
+  	            syslog(LOG_INFO, _(IP_ADDR_S " (%s) didn't respond to ping"),
+		           IP_ADDR_V(p->vpn_ip), p->hostname);
+	          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
   return 0;
 }
 
@@ -880,11 +979,11 @@ int handle_new_meta_connection(conn_list_t *cl)
 {
   conn_list_t *ncn;
   struct sockaddr client;
-  int nfd, len = sizeof(struct sockaddr);
-
+  int nfd, len = sizeof(client);
+cp
   if((nfd = accept(cl->meta_socket, &client, &len)) < 0)
     {
-      syslog(LOG_ERR, "Accepting a new connection failed: %m");
+      syslog(LOG_ERR, _("Accepting a new connection failed: %m"));
       return -1;
     }
 
@@ -892,14 +991,14 @@ int handle_new_meta_connection(conn_list_t *cl)
     {
       shutdown(nfd, 2);
       close(nfd);
-      syslog(LOG_NOTICE, "Closed attempted connection.");
+      syslog(LOG_NOTICE, _("Closed attempted connection"));
       return 0;
     }
 
   ncn->status.meta = 1;
   ncn->next = conn_list;
   conn_list = ncn;
-
+cp
   return 0;
 }
 
@@ -908,38 +1007,93 @@ int handle_new_meta_connection(conn_list_t *cl)
 */
 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)
     {
-      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"), __FILE__, __LINE__, cl->meta_socket);
       return -1;
     }
   if(x)
     {
-      syslog(LOG_ERR, "Metadata socket error: %s", sys_errlist[x]);
+      syslog(LOG_ERR, _("Metadata socket error: %s"), sys_errlist[x]);
       return -1;
     }
 
-  if((lenin = recv(cl->meta_socket, &tmp, sizeof(tmp), 0)) <= 0)
+  if(cl->buflen >= MAXBUFSIZE)
     {
-      syslog(LOG_ERR, "Receive failed: %m");
+      syslog(LOG_ERR, _("Metadata read buffer overflow!"));
       return -1;
     }
 
-  request = (int)(tmp[0]);
-
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, "got request %d", request);
+  lenin = read(cl->meta_socket, cl->buffer, MAXBUFSIZE-cl->buflen);
 
-  if(request_handlers[request] == NULL)
-    syslog(LOG_ERR, "Unknown request %d.", request);
-  else
-    if(request_handlers[request](cl, tmp, lenin) < 0)
+  if(lenin<=0)
+    {
+      syslog(LOG_ERR, _("Metadata socket read error: %m"));
       return -1;
-  
+    }
+
+  oldlen = cl->buflen;
+  cl->buflen += lenin;
+
+  for(;;)
+    {
+      cl->reqlen = 0;
+
+      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(debug_lvl > 2)
+            syslog(LOG_DEBUG, _("Got request from " IP_ADDR_S " (%s): %s"),
+                         IP_ADDR_V(cl->vpn_ip), cl->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 " IP_ADDR_S " (%s)"),
+                         IP_ADDR_V(cl->vpn_ip), cl->hostname);
+                  return -1;
+                }
+
+              if(request_handlers[request](cl))  /* Something went wrong. Probably scriptkiddies. Terminate. */
+                {
+                  syslog(LOG_ERR, _("Error while processing request from " IP_ADDR_S " (%s)"),
+                         IP_ADDR_V(cl->vpn_ip), cl->hostname);
+                  return -1;
+                }
+            }
+          else
+            {
+              syslog(LOG_ERR, _("Bogus data received from " IP_ADDR_S " (%s)"),
+                         IP_ADDR_V(cl->vpn_ip), cl->hostname);
+              return -1;
+            }
+
+          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;
 }
 
@@ -951,13 +1105,13 @@ void check_network_activity(fd_set *f)
 {
   conn_list_t *p;
   int x, l = sizeof(x);
-
+cp
   for(p = conn_list; p != NULL; p = p->next)
     {
       if(p->status.remove)
 	continue;
-cp
-      if(p->status.active)
+
+      if(p->status.dataopen)
 	if(FD_ISSET(p->socket, f))
 	  {
 	    /*
@@ -967,11 +1121,11 @@ cp
 	      I've once got here when it said `No route to host'.
 	    */
 	    getsockopt(p->socket, SOL_SOCKET, SO_ERROR, &x, &l);
-	    syslog(LOG_ERR, "Outgoing data socket error: %s", sys_errlist[x]);
+	    syslog(LOG_ERR, _("Outgoing data socket error: %s"), sys_errlist[x]);
 	    terminate_connection(p);
 	    return;
 	  }  
-cp
+
       if(p->status.meta)
 	if(FD_ISSET(p->meta_socket, f))
 	  if(handle_incoming_meta_data(p) < 0)
@@ -979,13 +1133,11 @@ cp
 	      terminate_connection(p);
 	      return;
 	    } 
-cp
     }
   
-cp
   if(FD_ISSET(myself->socket, f))
     handle_incoming_vpn_data(myself);
-cp
+
   if(FD_ISSET(myself->meta_socket, f))
     handle_new_meta_connection(myself);
 cp
@@ -1000,11 +1152,11 @@ void handle_tap_input(void)
   vpn_packet_t vp;
   ip_t from, to;
   int ether_type, lenin;
-  
+cp  
   memset(&vp, 0, sizeof(vp));
   if((lenin = read(tap_fd, &vp, MTU)) <= 0)
     {
-      syslog(LOG_ERR, "Error while reading from tapdevice: %m");
+      syslog(LOG_ERR, _("Error while reading from tapdevice: %m"));
       return;
     }
 
@@ -1013,83 +1165,71 @@ void handle_tap_input(void)
   ether_type = ntohs(*((unsigned short*)(&vp.data[12])));
   if(ether_type != 0x0800)
     {
-      if(debug_lvl > 0)
-	syslog(LOG_INFO, "Non-IP ethernet frame %04x from " MAC_ADDR_S,
+      if(debug_lvl > 3)
+	syslog(LOG_INFO, _("Non-IP ethernet frame %04x from " MAC_ADDR_S),
 	       ether_type, MAC_ADDR_V(vp.data[6]));
       return;
     }
   
   if(lenin < 32)
     {
-      if(debug_lvl > 0)
-	syslog(LOG_INFO, "Dropping short packet");
+      if(debug_lvl > 3)
+	syslog(LOG_INFO, _("Dropping short packet"));
       return;
     }
 
   from = ntohl(*((unsigned long*)(&vp.data[26])));
   to = ntohl(*((unsigned long*)(&vp.data[30])));
 
-  if(debug_lvl > 2)
-    syslog(LOG_DEBUG, "An IP packet (%04x) for " IP_ADDR_S " from " IP_ADDR_S,
-	   ether_type, IP_ADDR_V(to), IP_ADDR_V(from));
-  if(debug_lvl > 3)
-    syslog(LOG_DEBUG, MAC_ADDR_S " to " MAC_ADDR_S,
-	   MAC_ADDR_V(vp.data[0]), MAC_ADDR_V(vp.data[6]));
-  
   vp.len = (length_t)lenin - 2;
-cp
+
   strip_mac_addresses(&vp);
-cp
+
   send_packet(to, &vp);
 cp
 }
 
 /*
-  this is where it al happens...
+  this is where it all happens...
 */
 void main_loop(void)
 {
   fd_set fset;
   struct timeval tv;
   int r;
-
-  last_ping_time = time(NULL);
+  time_t last_ping_check;
+cp
+  last_ping_check = time(NULL);
 
   for(;;)
     {
       tv.tv_sec = timeout;
       tv.tv_usec = 0;
 
-cp
       prune_conn_list();
-cp
       build_fdset(&fset);
-cp
 
       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");
+          syslog(LOG_ERR, _("Error while waiting for input: %m"));
           return;
         }
-cp
 
-      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;
 	}
 
-cp
       check_network_activity(&fset);
 
-cp
       /* local tap data */
       if(FD_ISSET(tap_fd, &fset))
 	handle_tap_input();
-cp
     }
+cp
 }