#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <getopt.h>
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include <security/pam_appl.h>
#include <security/pam_modules.h>

static int converse(int n, const struct pam_message **msg,
                    struct pam_response **resp, void *data)
{
    return PAM_SUCCESS;
}

int main()
{
    pam_handle_t *pamh;
    struct pam_conv pamc;
    pamc.conv = converse;
    int rc = pam_start("pamapp", "admin", &pamc, &pamh);
    if (rc != PAM_SUCCESS)
    {
        printf("Failed to init PAM (%s)\n", pam_strerror(pamh, rc));
        return EXIT_FAILURE;
    }

    char buff[256];
    gethostname(buff, sizeof(buff));
    rc = pam_set_item(pamh, PAM_RUSER, "admin");
    rc = pam_set_item(pamh, PAM_RHOST, strdup(buff));
    if (rc != PAM_SUCCESS)
        printf("Failed to set items: %s (%d)\n", pam_strerror(pamh, rc), rc);

    rc = pam_authenticate(pamh, 0);
    if (rc != PAM_SUCCESS)
    {
        printf("Failed to authenticate: %s (%d)\n", pam_strerror(pamh, rc), rc);
        if (rc == PAM_MODULE_UNKNOWN)
            printf("Are 32 bit modules installed? (apt-get install libpam-modules:i386)");
    }

    pam_end(pamh, rc);

    return rc =! PAM_SUCCESS;
}