#include <security/pam_appl.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

static int pam_conv_handler(int num_msg, const struct pam_message ** msg,
                struct pam_response ** resp, void *appdata_ptr)
{
        int  i;
        struct pam_response  *response;

        /* parameter sanity checking */
        if (!resp || !msg)
                return PAM_CONV_ERR;

        /* allocate memory to store response */
        response = malloc(num_msg * sizeof(struct pam_response));
        if (!response)
                return PAM_CONV_ERR;

        /* copy values */
        for (i = 0; i < num_msg; i++) {
                /* initialize to safe values */
                response[i].resp_retcode = 0;
                response[i].resp = 0;

                /* select response based on requested output style */
                switch (msg[i]->msg_style) {
                        case PAM_PROMPT_ECHO_ON:
                                /* on memory allocation failure, auth fails */
                                response[i].resp = strdup("mylogin");
                                break;
                        case PAM_PROMPT_ECHO_OFF:
                                response[i].resp = strdup("mypassword");
                                break;
                        default:
                                if (response) {
                                        free(response);
                                }
                                return PAM_CONV_ERR;
                }
        }
        /* everything okay, set PAM response values */
        *resp = response;
        return PAM_SUCCESS;
}


int main(int argc, char **argv) {
        int rc;
        pam_handle_t *pamh = NULL;
        struct pam_conv conv_info;

        conv_info.conv = pam_conv_handler;
        if ((rc = pam_start("phpmyadmin", "mylogin", &conv_info, &pamh)) != PAM_SUCCESS) {
                fprintf(stderr, "Error: %s", pam_strerror(pamh, rc));
                return 1;
        }

        if ((rc = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK)) != PAM_SUCCESS) {
                fprintf(stderr, "Error: %s", pam_strerror(pamh, rc));
                return 1;
        }

        if ((rc = pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK)) != PAM_SUCCESS) {
                fprintf(stderr, "Error: %s", pam_strerror(pamh, rc));
                pam_end(pamh, PAM_SUCCESS);
                return 1;
        }

        pam_end(pamh, PAM_SUCCESS);
        return 0;
}