sasl_client_start(10 July 2001)		       sasl_client_start(10 July 2001)



NAME
       sasl_client_start - Begin an authentication negotiation

SYNOPSIS
       #include <sasl/sasl.h>

       int sasl_client_start(sasl_conn_t * conn,
		       const char * mechlist,
		       sasl_interact_t ** prompt_need,
		       const char ** clientout,
		       unsigned * clientoutlen,
		       const char ** mech);


DESCRIPTION
       sasl_client_start()  selects  a mechanism for authentication and starts
       the authentication session. The mechlist is the list of mechanisms  the
       client  might like to use. The mechanisms in the list are not necessar-
       ily supported by the client or even valid.  SASL	 determines  which  of
       these to use based upon the security preferences specified earlier. The
       list of mechanisms is typically a list of mechanisms  the  server  sup-
       ports acquired from a capability request.

       If SASL_INTERACT is returned the library needs some values to be filled
       in before it can proceed. The prompt_need structure will be  filled  in
       with  requests.	The application should fulfill these requests and call
       sasl_client_start again	with  identical	 parameters  (the  prompt_need
       parameter  will	be  the	 same  pointer	as before but filled in by the
       application).


       mechlist is a list of mechanisms the server has available.  Punctuation
       is ignored.

       prompt_need  is filled in with a list of prompts needed to continue (if
       necessary).

       clientout and  clientoutlen  is	created.  It  is  the  initial	client
       response	 to send to the server. It is the job of the client to send it
       over the network to the server.	Any protocol specific  encoding	 (such
       as base64 encoding) necessary needs to be done by the client.

       If  the protocol lacks client-send-first capability, then set clientout
       to NULL.

       If there is no initial client-send, then *clientout will be set to NULL
       on return.

       mech contains the name of the chosen SASL mechanism (on success)


RETURN VALUE
       sasl_client_start  returns  an  integer which corresponds to one of the
       following codes. SASL_CONTINUE indicates success	 and  that  there  are
       more  steps  needed in the authentication. All other return codes indi-
       cate errors and should either be handled or the authentication  session
       should be quit.


CONFORMING TO
       RFC 2222

SEE ALSO
       sasl(3),	   sasl_callbacks(3),	sasl_errors(3),	  sasl_client_init(3),
       sasl_client_new(3), sasl_client_step(3)



SASL man pages			     SASL      sasl_client_start(10 July 2001)