Initial code checkin.

README.md

@@ -2,3 +2,20 @@ nassh-relay
 ===========
 
 Relay for Native Client SSH, see http://goo.gl/HMsm8p
+
+Typical use case is when you want to firewall your sshd port. Also the
+relay supports roaming clients better than a direct TCP connection, as
+the TCP stack cuts the connection if the client IP changes. This relay
+on the other hand supports reconnecing from all HTTP client as long as
+the client can present it with the correct session ID[*].
+
+Invoke:
+$ node nassh-relay.js <port> [external-redirect]
+
+At relay selection, the server echos back the HTTP Host header as the
+relay. If that host is not directly reachable by its clients, you need
+to specify an external-redirect.
+
+[*] The session is still protected by SSH, so guessing the session ID
+is a denial of service attack and allows sniffing the encrypted sshd
+response bytestream.