ssltap

The SSL Debugging Tool, ssltap, is an SSL-aware command-line proxy. It can proxy requests for an SSL server and display the contents of the messages exchanged between the client and server. It watches TCP connections and displays the data going by. If a connection is SSL, the data display includes interpreted SSL records and handshaking. More information can be found at:

http://www.mozilla.org/projects/security/pki/nss/tools/ssltap.html