#define _XOPEN_SOURCE
#define EXIT_SUCCESS 0
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <time.h>

void wait(int seconds)
{
	clock_t endtime = clock() + seconds * CLOCKS_PER_SEC;
	while ((clock() < endtime));
}

int main()
{
	char *password, read[100], salt[] = "$1$8Hlk7DfS";
	FILE *file;
	if ((file  = fopen("/etc/pssword", "r")) == NULL)
	{
		printf("\nFile doesn't exist, run 'pssword' first.\n");  //'/etc/pssword' will exsist or it will use
                                                                         //'/etc/shadow' the way it should once i figure
                                                                         //out how or someone know's and help's out.
		exit(-1);
	}
	password = (char *) malloc(100);
	if (fgets(read, sizeof(read), file) == NULL)
	{
		printf("\nNo password for %s exist's, try running 'pssword' as root.\n", getlogin());
		free(password);
	  	exit(-1);
	}
	do
	{
		printf("\nPlease enter your password.\n");
		printf("\nPassword:");
    		scanf("%s", password);
		strcpy(password, crypt(password, salt));  //This seem's like a problem, if 'password' doesnt meet the
                                                          //requirements then it's copied to as many time's as it doesnt.
							  //This program need's to be compiled with the '-lcrypt' option
                                                          //to utilize the GNU des library for the 'crypt()' function.
		if (strcmp(password, read) < 0 || strcmp(password, read) > 0)
		{
			wait(2);
			printf("\nPassword incorrect\n");
	        }
	}
	while (strcmp(password, read) < 0 || strcmp(password, read) > 0);
	wait(2);
	printf("\n%s successfully logged in!\n", getlogin());
	if (fclose(file) == EOF)
	{
		printf("\nUnable to close file.\n");
		free(password);
		exit(-1);
	}
	free(password);
	return EXIT_SUCCESS;
}

#define _XOPEN_SOURCE
#define EXIT_SUCCESS 0
#define MAX_PASS_LENGTH 15
#define MIN_PASS_LENGTH 6
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <strings.h>
#include <time.h>

void wait(int seconds)
{
	clock_t endtime = clock() + seconds * CLOCKS_PER_SEC;
	while ((clock() < endtime));
}

int main()
{
 	char *password, write[100], salt[] = "$1$8Hlk7DfS";
	FILE *file;
	if ((file = fopen("/etc/pssword", "w+")) == NULL)
	{
		printf("\nUnable to create '/etc/pssword', only root can change or create the password.\n"); //At present
                                                                                                    //you have to be root.
		exit(-1);
   	}
	password = (char *) malloc(100);
	do
	{
		printf("\nPlease input a password no more than 15 charactors, no less than 6.\n");
		printf("Password:");
		scanf("%s", password);
		wait(2);
		if (strlen(password) < MIN_PASS_LENGTH)
		{
			wait(2);
			printf("\nThe password has to be greater than 6 charactors, try again.\n");
		}
		else if (strlen(password) > MAX_PASS_LENGTH)
		{
			wait(2);
			printf("\nthe password need's to be less than 15 charactor's, try again.\n");
		}
	}
	while (strlen(password) < MIN_PASS_LENGTH || strlen(password) > MAX_PASS_LENGTH);
	strcpy(write, crypt(password, salt)); //This program need's to be compiled with the '-lcrypt' option to utilize 
	if (fputs(write, file) == EOF)        //the GNU des library for the 'crypt()' function.
	{
		printf("\nUnable to write to file.\n");
		free(password);
		exit(-1);
	}
	if (fclose(file) == EOF)
	{
		printf("\nUnable to close file.\n");
		free(password);
		exit(-1);
	}
	free(password);
	return EXIT_SUCCESS;
}