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sasl_client_start(3)

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  pa‐
       rameter  will be the same pointer as before but filled in by the appli‐
       cation).


       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  re‐
       sponse  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 4422

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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