SSLOn (Socket function)
Turn on SSL processing (Socket class)
[%number =] socket:SSLOn
|%number||A numeric variable to contain the returned indicator of success of the function. The possible return values are listed in Return codes below.|
|socket||A variable or an expression that is a reference to a Socket object.|
The method's return value (%number) is one of these:
|0||Successfully switched to SSL.|
|-110||Attempted on non-SSL port. SSLOn can only be attempted on a port with SSL and SSLOPT on the JANUS DEFINE command.|
|-111||SSL handshake error. Likely result of trying to use the SSLOn method against a non-SSL port.|
|-112||Have pending incoming data. The SSLOn method is invalid until all incoming (presumably) non-SSL data has been received.|
|-149||Other error during connection.|
- SSLOn makes it possible to:
- Make an initial connection from a Janus Sockets client application to a proxy server
- Issue the HTTP CONNECT method/command to connect to a server through the proxy
- Communicate via SSL with the back end server, simply having the proxy server act as a "tunnel" for the SSL data
- As shown in Examples below, the SSLOn method should be used after a positive response has been received for a CONNECT method request on a Janus Sockets client socket.
The following code shows the use of the SSLOn method;
%sock is Object Socket %sock = New('WEBDROPS', 'proxy') %r = %sock:Set('LINEND', '0D0A') %r = %sock:Set('PRSTOK', '0D0A') %r = %sock:Send('CONNECT ') %r = %sock:Send('sirius-software.com:443') %r = %sock:SendWithLineEnd(' HTTP/1.0') %r = %sock:SendWithLineEnd() %r = %sock:ReceiveAndParse(%s) If $WORD(%s, , 2) Ne '200' Then Call CONNECT_ERROR End If Repeat Forever %r = %sock:ReceiveAndParse(%s) If $LSTR_LEN(%s) Eq 0 Then Loop End End If End Repeat %r = %sock:SSLOn If %r Then Call SSL_ERROR End If %r = %sock:Send('GET ') %r = %sock:Send(%URL) %r = %sock:SendWithLineEnd(' HTTP/1.0') %r = %sock:SendWithLineEnd() ...
For more information about HTTP tunneling and the CONNECT method, see http://www.ietf.org/rfc/rfc2817.txt. Many other references are also available on the web.