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/* gcc -o epam -lpam -lpam_misc epam.c -g */

#include <security/pam_appl.h>
#include <security/pam_misc.h>
#include <stdio.h>

static struct pam_conv  conv = {
    misc_conv,
    NULL
};

int main (int argc, char *argv[])
{
    pam_handle_t           *pamh = NULL;
    int                     retval;
    const char             *user = "nobody";

    if (argc == 2)
        user = argv[1];

    if (argc > 2)
    {
        fprintf (stderr, "Usage: check_user [username]\n");
        exit (1);
    }

    retval = pam_start ("elock", user, &conv, &pamh);

    printf (":%s\n", pam_strerror (pamh, retval));

    if (retval == PAM_SUCCESS)
        retval = pam_authenticate (pamh, 0);
    printf (":%s\n", pam_strerror (pamh, retval));

    if (retval == PAM_SUCCESS)
        retval = pam_acct_mgmt (pamh, 0);
    printf (":%s\n", pam_strerror (pamh, retval));

    if (retval == PAM_SUCCESS)
        fprintf (stdout, "Authenticated\n");
    else
        fprintf (stdout, "Not Authenticated\n");
    printf (":%s\n", pam_strerror (pamh, retval));

    if (pam_end (pamh, retval) != PAM_SUCCESS)
    {
        pamh = NULL;
        fprintf (stderr, "check_user: failed to release authenticator\n");
        exit (1);
    }
    printf (":%s\n", pam_strerror (pamh, retval));

    return (retval == PAM_SUCCESS ? 0 : 1);
}