Fix bug resulting in tight-loop when new interfaces arrive.

src/network.c

@@ -443,7 +443,7 @@ static int iface_allowed_v4(struct in_addr local, int if_index, char *label,
 int enumerate_interfaces(int reset)
 {
   static struct addrlist *spare = NULL;
-  static int done = 0;
+  static int done = 0, active = 0;
   struct iface_param param;
   int errsave, ret = 1;
   struct addrlist *addr, *tmp;
@@ -458,11 +458,14 @@ int enumerate_interfaces(int reset)
       return 1;
     }
 
-  if (done)
+  if (done || active)
     return 1;
 
   done = 1;
 
+  /* protect against recusive calls from iface_enumerate(); */
+  active = 1;
+
   if ((param.fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
     return 0;
  
@@ -504,6 +507,7 @@ int enumerate_interfaces(int reset)
   errno = errsave;
 
   spare = param.spare;
+  active = 0;
 
   return ret;
 }