From b05c2ed42428577ed3b85593a9d862243ed8d4f2 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@anytun.org>
Date: Wed, 4 Feb 2009 14:40:45 +0000
Subject: not sending packet when remote addr is unkown

---
 src/uanytun.c | 4 ++++
 src/udp.c     | 4 +++-
 src/udp.h     | 1 +
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/uanytun.c b/src/uanytun.c
index c80ca8b..42b082a 100644
--- a/src/uanytun.c
+++ b/src/uanytun.c
@@ -155,6 +155,9 @@ int process_tun_data(tun_device_t* dev, udp_socket_t* sock, options_t* opt, plai
     plain_packet_set_type(plain_packet, PAYLOAD_TYPE_TAP);    
   else
     plain_packet_set_type(plain_packet, PAYLOAD_TYPE_UNKNOWN);
+
+  if(!sock->remote_end_set_)
+    return 0;
   
   cipher_encrypt(c, kd, kd_outbound, plain_packet, encrypted_packet, seq_nr, opt->sender_id_, opt->mux_); 
   
@@ -212,6 +215,7 @@ int process_sock_data(tun_device_t* dev, udp_socket_t* sock, options_t* opt, pla
    
   if(memcmp(&remote, &(sock->remote_end_), sizeof(remote))) {
     memcpy(&(sock->remote_end_), &remote, sizeof(remote));
+    sock->remote_end_set_ = 1;
     char* addrstring = udp_endpoint_to_string(remote);
     log_printf(NOTICE, "autodetected remote host changed %s", addrstring);
     free(addrstring);
diff --git a/src/udp.c b/src/udp.c
index 853812c..4d59509 100644
--- a/src/udp.c
+++ b/src/udp.c
@@ -51,6 +51,7 @@ int udp_init(udp_socket_t* sock, const char* local_addr, const char* port)
   sock->fd_ = 0;
   memset(&(sock->local_end_), 0, sizeof(sock->local_end_));
   memset(&(sock->remote_end_), 0, sizeof(sock->local_end_));
+  sock->remote_end_set_ = 0;
 
   struct addrinfo hints, *res;
 
@@ -116,6 +117,7 @@ void udp_set_remote(udp_socket_t* sock, const char* remote_addr, const char* por
     return;
   }
   memcpy(&(sock->remote_end_), res->ai_addr, sizeof(*(res->ai_addr)));
+  sock->remote_end_set_ = 1;
   freeaddrinfo(res);
 }
 
@@ -172,7 +174,7 @@ char* udp_get_local_end_string(udp_socket_t* sock)
 
 char* udp_get_remote_end_string(udp_socket_t* sock)
 {
-  if(!sock)
+  if(!sock || !sock->remote_end_set_)
     return "";
 
   return udp_endpoint_to_string(sock->remote_end_);
diff --git a/src/udp.h b/src/udp.h
index d998b39..b033c5e 100644
--- a/src/udp.h
+++ b/src/udp.h
@@ -49,6 +49,7 @@ struct udp_socket_struct {
   int fd_;
   udp_endpoint_t local_end_;
   udp_endpoint_t remote_end_;
+  int remote_end_set_;
 };
 typedef struct udp_socket_struct udp_socket_t;
 
-- 
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