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Full Discussion: Returning Strings from C program to Unix shell script
Top Forums Programming Returning Strings from C program to Unix shell script Post 66350 by reborg on Sunday 13th of March 2005 02:03:50 PM
Old 03-13-2005
That's not really the way things are done in Unix.

There is an old tenet in Unix programming which says, if you have nothing to say don't say anything, in other words if there is no reason for output from your program don't have any. So taking that into account you should not have any debugging output.

That said you could make sure you have the correct information by making sure the outut of the "correct" printf has a well defined format, by prefixing it with something, like this.

Code:
printf("DECRYPTED_DATA %s", decrypted_password);

he the script would for example become
Code:
clear_text_password=$(my_C_program | awk '/DECRYPTED_DATA/{print $2}' )
if [[ $? -eq 0 ]] ; then
     #The password was returned correctly
     #Do whatever you like here
     echo "The decrypted value is: ${clear_text_password}
else
     echo "Password decryption failed"
     exit 1
fi

 

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LEARN ABOUT CENTOS

pwauth

PWAUTH(8)						      System Manager's Manual							 PWAUTH(8)

NAME

       pwauth - authenticator for mod_authnz_external and the Apache HTTP Daemon

SYNOPSIS

       pwauth

DESCRIPTION

       Pwauth  is an authenticator designed to be used with mod_auth_external or mod_authnz_external and the Apache HTTP Daemon to support reason-
       ably secure web authentication out of the system password database on most versions of Unix. Particulary -  secure  authentication  against
       PAM.

       The  simplest test pwauth is to start a root shell and just run pwauth. It will attempt to read the login and password from standard input,
       so type a login name, hit return, then type a password, and hit return (the password will echo on your screen). The check the  status  code
       that was returned (in csh: "echo $status" in sh: "echo $?").

       If  the	login/password were correct you should get a zero status code. If not, you will get some other value. See below the list of status
       codes to find the meaning of the various values returned. Any values 50 or greater indicate a configuration error.

STATUS CODES


       0 STATUS_OK
	      Login OK.

       1 STATUS_UNKNOWN
	      Nonexistant login or (for some configurations) incorrect password.

       2 STATUS_INVALID
	      Incorrect password (for some configurations).

       3 STATUS_BLOCKED
	      Uid number is below MIN_UNIX_UID value configured in config.h.

       4 STATUS_EXPIRED
	      Login ID has expired.

       5 STATUS_PW_EXPIRED
	      Login's password has expired.

       6 SSTATUS_NOLOGIN
	      Logins to system have been turned off (usually by /etc/nologin file).

       7 STATUS_MANYFAILES
	      Limit on number of bad logins exceeded.

       50 STATUS_INT_USER
	      pwauth was invoked by a uid not on the SERVER_UIDS list. If you get this error code, you probably have SERVER_UIDS  set  incorrectly
	      in pwauth's config.h file.

       51 STATUS_INT_ARGS
	      pwauth  was not given a login & password to check. The means the passing of data from mod_auth_external to pwauth is messed up. Most
	      likely one is trying to pass data via environment variables, while the other is trying to pass data via a pipe.

       52 STATUS_INT_ERR
	      one of several rare and unlikely internal errors occurred. You'll have to read the source code to figure these out.

       53 STATUS_INT_NOROOT
	      pwauth was not able to read the password database. Usually this means it is not running as root. (PAM and login.conf  configurations
	      will return 1 in this case.)

AUTHOR

       pwauth was written by Jan Wolter <jan@unixpapa.com>.

       This manual page was written by Hai Zaar <haizaar@haizaar.com>, for the Debian project (but may be used by others).

								    2009-05-02								 PWAUTH(8)
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