Check for valid hostname lookup in sg_socket.cxx.

diff --git a/simgear/io/sg_socket.cxx b/simgear/io/sg_socket.cxx
index 144c64dfa8a9b75802fa34a1713dc8b6a41bc25d..905639b91d2c01f437dbe9a01d2b9827246f5658 100644 (file)
--- a/simgear/io/sg_socket.cxx
+++ b/simgear/io/sg_socket.cxx
@@ -132,6 +132,10 @@ SGSocket::SocketType SGSocket::make_client_socket () {
 
     // get the hosts official name/info
     hp = gethostbyname( hostname.c_str() );
+    if (hp == NULL) {
+       SG_LOG( SG_IO, SG_ALERT, "Error: hostname lookup failed" );
+       return INVALID_SOCKET;
+    }
 
     // Connect this socket to the host and the port specified on the
     // command line