First step for implementation of the "indirectdata" directive. This should

[tinc] / src / protocol.c

diff --git a/src/protocol.c b/src/protocol.c
index f0b7cb9..1e96493 100644 (file)
--- a/src/protocol.c
+++ b/src/protocol.c
@@ -17,7 +17,7 @@
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
-    $Id: protocol.c,v 1.26 2000/05/29 21:01:25 zarq Exp $
+    $Id: protocol.c,v 1.28.4.1 2000/06/23 19:27:03 guus Exp $
 */
 
 #include "config.h"
@@ -154,12 +154,30 @@ cp
 
 int send_add_host(conn_list_t *cl, conn_list_t *new_host)
 {
+  ip_t real_ip;
+  int flags;
 cp
   if(debug_lvl > 2)
     syslog(LOG_DEBUG, _("Sending add host to " IP_ADDR_S),
           IP_ADDR_V(cl->vpn_ip));
 
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x\n", ADD_HOST, new_host->real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port);
+  real_ip = new_host->real_ip;
+  flags = new_host->flags;
+  
+  /* If we need to propagate information about a new host that wants us to export
+   * it's indirectdata flag, we set the INDIRECTDATA flag and unset the EXPORT...
+   * flag, and set it's real_ip to our vpn_ip, so that net.c send_packet() will
+   * work correctly.
+   */
+     
+  if(flags & EXPORTINDIRECTDATA)
+    {
+      flags &= ~EXPORTINDIRECTDATA;
+      flags |= INDIRECTDATA;
+      real_ip = myself->vpn_ip;
+    }
+
+  buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x %d\n", ADD_HOST, new_host->real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port, flags);
 
   if((write(cl->meta_socket, buffer, buflen)) < 0)
     {
@@ -205,7 +223,7 @@ cp
     syslog(LOG_DEBUG, _("Send BASIC_INFO to " IP_ADDR_S),
           IP_ADDR_V(cl->real_ip));
 
-  buflen = snprintf(buffer, MAXBUFSIZE, "%d %d %lx/%lx:%x\n", BASIC_INFO, PROT_CURRENT, myself->vpn_ip, myself->vpn_mask, myself->port);
+  buflen = snprintf(buffer, MAXBUFSIZE, "%d %d %lx/%lx:%x %d\n", BASIC_INFO, PROT_CURRENT, myself->vpn_ip, myself->vpn_mask, myself->port, myself->flags);
 
   if((write(cl->meta_socket, buffer, buflen)) < 0)
     {
@@ -365,7 +383,7 @@ cp
 int basic_info_h(conn_list_t *cl)
 {
 cp
-  if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port) != 4)
+  if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5)
     {
        syslog(LOG_ERR, _("got bad BASIC_INFO request: %s"), cl->buffer);
        return -1;
@@ -451,19 +469,21 @@ cp
   if(cl->status.outgoing)
     send_public_key(cl);
   else
-    send_ack(cl);
+    {
+      send_ack(cl);
 
-  /* Okay, before we active the connection, we check if there is another entry
-     in the connection list with the same vpn_ip. If so, it presumably is an
-     old connection that has timed out but we don't know it yet. Because our
-     conn_list entry is not active, lookup_conn will skip ourself. */
+      /* Okay, before we active the connection, we check if there is another entry
+         in the connection list with the same vpn_ip. If so, it presumably is an
+         old connection that has timed out but we don't know it yet. Because our
+         conn_list entry is not active, lookup_conn will skip ourself. */
 
-  while(old=lookup_conn(cl->vpn_ip)) 
-    terminate_connection(old);
+      while(old=lookup_conn(cl->vpn_ip)) 
+        terminate_connection(old);
 
-  cl->status.active = 1;
-  notify_others(cl, NULL, send_add_host);
-  notify_one(cl);
+      cl->status.active = 1;
+      notify_others(cl, NULL, send_add_host);
+      notify_one(cl);
+    }
 cp
   return 0;
 }
@@ -566,10 +586,12 @@ int add_host_h(conn_list_t *cl)
   ip_t vpn_ip;
   ip_t vpn_mask;
   unsigned short port;
+  int flags;
   conn_list_t *ncn, *fw;
 cp
-  if(!cl->status.active) return -1;
-  if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx", &real_ip, &vpn_ip, &vpn_mask, &port) != 4)
+  if(!cl->status.active)
+    return -1;
+  if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx %d", &real_ip, &vpn_ip, &vpn_mask, &port, &flags) != 5)
     {
        syslog(LOG_ERR, _("got bad ADD_HOST request: %s"), cl->buffer);
        return -1;
@@ -586,7 +608,12 @@ cp
   */
   if((fw = lookup_conn(vpn_ip)))
     {
-      notify_others(fw, cl, send_add_host);
+      if(fw->nexthop == cl)
+       notify_others(fw, cl, send_add_host);
+      else
+       if(debug_lvl > 1)
+         syslog(LOG_DEBUG, _("Invalid add_host request from " IP_ADDR_S),
+                             IP_ADDR_V(cl->vpn_ip));
       return 0;
     }
 
@@ -595,6 +622,7 @@ cp
   ncn->vpn_ip = vpn_ip;
   ncn->vpn_mask = vpn_mask;
   ncn->port = port;
+  ncn->flags = flags;
   ncn->hostname = hostlookup(real_ip);
   ncn->nexthop = cl;
   ncn->next = conn_list;