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want to use output of c programme in expect

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# 1  
Old 06-13-2007
want to use output of c programme in expect
hi
i am having a c code which gives the output of my password in text format

i.e when i run my c code which which gives the password asfollows====>>>>>>
$./passwdprogram ======>>>>>>abc@123(this is the output)


now i have an expect script to remotely ssh which uses the password set in programme and works fine
if given in clear text format as follows
==========================================
#!/usr/bin/expect -f

set argu [lindex $argv 0]
set argg [lindex $argv 1]
set password "abc@123" ================here i want to change


spawn ssh user@<ip adress > sh portalhits $argu $argg
expect "^password:"
send "$password\r"
interact
==========================================
I want to use this in the following way

#!/usr/bin/expect -f

set argu [lindex $argv 0]
set argg [lindex $argv 1]
set password "./passwordprogramme" (in c) ================here i want to change


spawn ssh user@<ip adress> sh portalhits $argu $argg
expect "^password:"
send "$password\r"
interact
============================
so i want to figure that is there any way by which i can set the variable password with the output of the c code(./passwordprogramme) programme

can we do this by system() command .


Thanx Smilie
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LEARN ABOUT MINIX

pwdauth

PWDAUTH()																 PWDAUTH()

NAME

       pwdauth - password authentication program

SYNOPSIS

       /usr/lib/pwdauth

DESCRIPTION

       Pwdauth is a program that is used by the crypt(3) function to do the hard work.	It is a setuid root utility so that it is able to read the
       shadow password file.

       Pwdauth expects on standard input two null terminated strings, the password typed by the user, and the salt.  That is, the two arguments of
       the  crypt  function.   The input read in a single read call must be 1024 characters or less including the nulls.  Pwdauth takes one of two
       actions depending on the salt.

       If the salt has the form "##user" then the user is used to index the shadow password file to obtain  the  encrypted  password.	The  input
       password  is encrypted with the one-way encryption function contained within pwdauth and compared to the encrypted password from the shadow
       password file.  If equal then pwdauth returns the string "##user" with exit code 0, otherwise exit code 2 to signal  failure.   The  string
       "##user" is also returned if both the shadow password and the input password are null strings to allow a password-less login.

       If  the salt is not of the form "##user" then the password is encrypted and the result of the encryption is returned.  If salt and password
       are null strings then a null string is returned.

       The return value is written to standard output as a null terminated string of 1024 characters or less including the null.

       The exit code is 1 on any error.

SEE ALSO

       crypt(3), passwd(5).

NOTES

       A password must be checked like in this example:

	      pw_ok = (strcmp(crypt(key, pw->pw_passwd), pw->pw_passwd) == 0);

       The second argument of crypt must be the entire encrypted password and not just the two character salt.

AUTHOR

       Kees J. Bot (kjb@cs.vu.nl)

																	 PWDAUTH()