how sasl get the username and password when authenticating ??

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hi , all

     i use postfix + cyrus-sasl + pam to do authentication. i want to pass a argument (like IPaddr) to sasl , and then to pam module.
     i have gone through a part of the source code of postfix and cyrus-sasl , due to a newbie to postfix and sasl , i am puzzled .
     i know that in postfix , it will invoke sasl_server_start() and sasl_server_step() when doing authentication , first i guess there should be sasl_client_***() in cyrus-sasl, but the fact is not like that (am i right?).
     then i turn around to source code of sasl, i just find in /cyrus-sasl-2.1.15/saslauthd/saslauthd-main.c , first saslauthd invoke the function ipc_unix.c then it calls do_request() , in do_request(), it get username (login id) and password from a unix socket fd . is that IPC? if it is , then which is the another process besides saslauthd ?
     i have gone through all the codes of cyrus-sasl and even postfix ,but i can't find who write the socket fd .
     Maybe i make mistake the machnism of the authenticate between postfix and sasl , so anybody who have idea please answer me , thanks in advance .
     i need to resolve :
        1) how postfix communicate with sasl ?
        2) how to transfer the arguments defined by myself between sasl and postfix ?

     thanks again ..

                                                louis

• Previous message: ms419 at freezone dot co dot uk: "saslauthd and pam_krb5"
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