[B<-cipher cipherlist>]
[B<-starttls protocol>]
[B<-engine id>]
+[B<-tlsextdebug>]
+[B<-no_ticket>]
+[B<-sess_out filename>]
+[B<-sess_in filename>]
[B<-rand file(s)>]
=head1 DESCRIPTION
=head1 OPTIONS
+In addition to the options below the B<s_client> utility also supports the
+common and client only options documented in the
+B<SUPPORTED COMMAND LINE OPTIONS> section in L<SSL_CONF_cmd(3)|SSL_CONF_cmd(3)>.
+
=over 4
=item B<-connect host:port>
A file containing trusted certificates to use during server authentication
and to use when attempting to build the client certificate chain.
+=item B<-purpose, -ignore_critical, -issuer_checks, -crl_check, -crl_check_all, -policy_check, -extended_crl, -x509_strict, -policy -check_ss_sig>
+
+Set various certificate chain valiadition option. See the
+L<B<verify>|verify(1)> manual page for details.
+
=item B<-reconnect>
reconnects to the same server 5 times using the same session ID, this can
show all protocol messages with hex dump.
+=item B<-trace>
+
+show verbose trace output of protocol messages. OpenSSL needs to be compiled
+with B<enable-ssl-trace> for this option to work.
+
+=item B<-msgfile>
+
+file to send output of B<-msg> or B<-trace> to, default standard output.
+
=item B<-nbio_test>
tests non-blocking I/O
inhibit printing of session and certificate information. This implicitly
turns on B<-ign_eof> as well.
+=item B<-psk_identity identity>
+
+Use the PSK identity B<identity> when using a PSK cipher suite.
+
+=item B<-psk key>
+
+Use the PSK key B<key> when using a PSK cipher suite. The key is
+given as a hexadecimal number without leading 0x, for example -psk
+1a2b3c4d.
+
=item B<-ssl2>, B<-ssl3>, B<-tls1>, B<-no_ssl2>, B<-no_ssl3>, B<-no_tls1>
these options disable the use of certain SSL or TLS protocols. By default
there are several known bug in SSL and TLS implementations. Adding this
option enables various workarounds.
+=item B<-brief>
+
+only provide a brief summary of connection parameters instead of the
+normal verbose output.
+
=item B<-cipher cipherlist>
this allows the cipher list sent by the client to be modified. Although
send the protocol-specific message(s) to switch to TLS for communication.
B<protocol> is a keyword for the intended protocol. Currently, the only
-supported keywords are "smtp" and "pop3".
+supported keywords are "smtp", "pop3", "imap", and "ftp".
+
+=item B<-tlsextdebug>
+
+print out a hex dump of any TLS extensions received from the server.
+
+=item B<-no_ticket>
+
+disable RFC4507bis session ticket support.
+
+=item B<-sess_out filename>
+
+output SSL session to B<filename>
+
+=item B<-sess_in sess.pem>
+
+load SSL session from B<filename>. The client will attempt to resume a
+connection from this session.
=item B<-engine id>
-specifying an engine (by it's unique B<id> string) will cause B<s_client>
+specifying an engine (by its unique B<id> string) will cause B<s_client>
to attempt to obtain a functional reference to the specified engine,
thus initialising it if needed. The engine will then be set as the default
for all available algorithms.
If there are problems verifying a server certificate then the
B<-showcerts> option can be used to show the whole chain.
+Since the SSLv23 client hello cannot include compression methods or extensions
+these will only be supported if its use is disabled, for example by using the
+B<-no_sslv2> option.
+
=head1 BUGS
Because this program has a lot of options and also because some of