Thread: How to capture password in c

Hi

I'm new to c. What I'm trying to do is much like httpd ssl. I'm trying to create a simple daemon where it will ask for a password/passphrase, and then check the password using pam. If the password/passphrase is wrong then the program should fail.

My simple question is how do I do this?

The full source code that I currently have is:

Code:

#include <sys/types.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>
#include <string.h>

int main(void) {

        /* Our process ID and Session ID */
        pid_t pid, sid;

        FILE *fin;
        int fwt;
        int c;
        #define BUFFER_LENGTH 50
        char line[BUFFER_LENGTH];

        /* Fork off the parent process */
        pid = fork();
        if (pid < 0) {
                exit(EXIT_FAILURE);
        }
        /* If we got a good PID, then
        we can exit the parent process. */
        if (pid > 0) {
                exit(EXIT_SUCCESS);
        }

        /* Change the file mode mask */
        umask(0);

        /* Open any logs here */

        /* Create a new SID for the child process */
        sid = setsid();
        if (sid < 0) {
                /* Log the failure */
                exit(EXIT_FAILURE);
        }



        /* Change the current working directory */
        if ((chdir("/")) < 0) {
                /* Log the failure */
                exit(EXIT_FAILURE);
        }

        /* Close out the standard file descriptors */
        close(STDIN_FILENO);
        close(STDOUT_FILENO);
        close(STDERR_FILENO);

        /* Daemon-specific initialization goes here */

        /* The Big Loop */
                printf ("hello");
        while (1) {
                printf ("hello");
                /* Do some task here ... */
                fin=fopen("/tmp/check","w");
                fwt=fprintf(fin,"hello");
                fclose(fin);
                //while (getc(stdin) != NULL){
                fgets(line,BUFSIZ,stdin);

                        printf("hello");

                printf("error code is: %d\n",fwt);


                sleep(30); /* wait 30 seconds */
        }
        exit(EXIT_SUCCESS);

Thanks in advance for your help

Dan