encapsulated several fillings of n2n_sock_t in single function (#1025)

* encapsulated several fillings of n2n_sock_t in single function

* Windows specifics...

* stuck to the project's style code

include/n2n_typedefs.h

@@ -240,6 +240,8 @@ typedef struct tuntap_dev {
 } tuntap_dev;
 
 #define SOCKET int
+#else /* #ifndef WIN32 */
+typedef u_short sa_family_t;
 #endif /* #ifndef WIN32 */
 
 

include/n2n_wire.h

@@ -190,6 +190,9 @@ int fill_sockaddr (struct sockaddr * addr,
                    size_t addrlen,
                    const n2n_sock_t * sock);
 
+int fill_n2nsock (n2n_sock_t* sock,
+                  struct sockaddr* sa);
+
 int encode_PACKET (uint8_t * base,
                    size_t * idx,
                    const n2n_common_t * common,