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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
       necessarily  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 supports 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 if 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 protocal 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  sucess  and that there are more steps needed in the authentication. All other return codes
       indicate 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)