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sasl_client_start(3)            SASL man pages            sasl_client_start(3)

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
       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 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                             10 July 2001             sasl_client_start(3)

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