openssl-examples/RUNNING at master · Andersbakken/openssl-examples · GitHub

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RUNNING THE EXAMPLE PROGRAMS

There are five example programs:

wclient	    -- a simple web client emulator
wserver	    -- a simple web server emulator
wclient2    -- a version of wclient with some extra options
	       including setting the cipher suite and
	       session caching.
wserver2    -- a version of wserver2 with some extra options
	       including setting the cipher suite, client
	       authentication, rehandshake, and session caching.
sclient	    -- a simple client program that echos from the keyboard
	       to the server and vice versa. sclient is a simple
	       model of a terminal client such as Telnet.

WCLIENT/WCLIENT2
wclient and wclient2 connect to the server of choice and issue
an HTTP GET request for the root of the server (e.g.
what you would get if you went to http://www.example.com/).
They print the response to the screen (without checking it)
and then shut down.

The client expects the server's certificate to be rooted in a CA found
in the file 'root.pem'. The client's key and certificate must be in
'client.pem'. An appropriate set of these files is included with the
distribution.

wclient accepts the following command line flags:

	-h <host>     connect to <host> (default is localhost)
	-p <port>     connect to <port> (default is 4433)
	-i	      don't require the server to present a
		      certificate. This is insecure but is
		      useful for testing.

wclient2 accepts all the wclient flags as well as:
	-a <ciphers>  restrict the cipher list to <ciphers>
		      <ciphers> is a colon-separated list.
		      do 'openssl ciphers' for a list of supported
		      ciphers

        -r	      after the initial handshake, hang up and
		      reconnect, attempting to resume the session

SCLIENT
sclient connects to the server and then forwards data between the
client's keyboard and the server and the server and the client's
screen. This is useful for debugging and as a simple remote access
client. sclient accepts the -h, -p, -i, and -a flags.

WSERVER/WSERVER2
wserver and wserver2 are mock HTTP servers. They read data from
the client until they encounter a pair of CRLFs. They then
return a canned HTTP response. No attempt is made to actually
examine the content of the client's request. A separate process
is forked for each client unless the '-n' flag is used (with
wserver2) thus allowing concurrent support for multiple clients.

The server expects its certificate to be rooted in a CA found in the
file 'root.pem'. The server's key and certificate must be in
'server.pem'. An appropriate set of these files is included with
the distribution.

wserver accepts no command line flags. It listens on port 4433.

wserver2 accepts the following command line flags:

	-c	      request (but don't require) certificate based
		      client authentication
        -C	      require certificate based client authentication.
	-x	      after the client has sent its request, force
		      a rehandshake requiring certificate based client
		      authentication. This emulates a server which
		      only requires client authentication for a proper
		      subset of its content.
	-a <ciphers>  restrict the cipher list to <ciphers>
		      <ciphers> is a colon-separated list.
		      do 'openssl ciphers' for a list of supported
		      ciphers
        -n	      don't fork a new process for each client.
		      The -n flag allows you to demonstrate session
		      resumption with the server, but at the cost
		      of not serving concurrent clients. If you
		      use 'wclient2 -r' with 'wserver' it will
		      still work but you won't get session resumption.

BUGS
wclient generates an error if you attempt to use wserver2 with the
-x flag. Use wclient2. This bug will not be fixed.

wserver generates an error if you attempt to use wclient2 with the
-r flag. Use wserver2. This bug will not be fixed.

These programs were originally designed to run under Linux and
therefore depend on /dev/random for their randomness. A future
version will include an option for other sources of randomness.