Changed ping behaviour (backwards compatible). If we don't have any data

[tinc] / src / net.c

diff --git a/src/net.c b/src/net.c
index 7b9133e..b6007b4 100644 (file)
--- a/src/net.c
+++ b/src/net.c
@@ -1,6 +1,6 @@
 /*
     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
@@ -51,8 +51,6 @@ int total_tap_out = 0;
 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;
@@ -107,6 +105,8 @@ cp
     }
 
   total_socket_out += r;
+
+  cl->want_ping = 1;
 cp
   return 0;
 }
@@ -123,6 +123,9 @@ cp
     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;
 }
@@ -304,21 +307,6 @@ cp
   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
 */
@@ -561,7 +549,7 @@ 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;
 
@@ -707,6 +695,8 @@ cp
   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));
 
@@ -841,52 +831,41 @@ cp
 }
 
 /*
-  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.get_pong = 0;
+              }
+          }
        }
     }
 cp
@@ -1004,6 +983,9 @@ cp
           break;
         }
     }
+
+  cl->last_ping_time = time(NULL);
+  cl->want_ping = 0;
 cp  
   return 0;
 }
@@ -1115,8 +1097,9 @@ 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(;;)
     {
@@ -1134,11 +1117,11 @@ cp
           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;
        }