NAME

       sasl_client_start - Cyrus SASL documentation

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

       int sasl_client_start(sasl_conn_t * conn,

       const char * mechlist,

       sasl_interact_t ** prompt_need,

       const char ** clientout,

       unsigned * clientoutlen,

       const char ** mech);
              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 mech‐ anisms 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).

              Parameters

                     • conn – is the SASL connection context

                     • 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 –

                       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.

                     • clientoutlen – length of clientout.

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

RETURN VALUE

       SASL   callback   functions  should  return  SASL return codes.  See sasl.h for a complete
       list. SASL_CONTINUE indicates success  and  that  there  are  more  steps  needed  in  the
       authentication.

       Other  return  codes  indicate  errors  and should either be handled or the authentication
       session should be quit.

SEE ALSO

       RFC  4422,:saslman:sasl(3),  sasl_callbacks(3),  sasl_client_init(3),  sasl_client_new(3),
       sasl_client_step(3), sasl_errors(3)

AUTHOR

       The Cyrus Team

COPYRIGHT

       1993-2022, The Cyrus Team