#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

void print_error(char *prog)
{
	fprintf(stdout, "Usage : %s password\n", prog);
	exit(-1);
}

int main(int argc, char *argv[])
{
	FILE *fp;
	char password[40];
	char *pointer1, *pointer2;

	// ÀÔ·Â ¿¡·¯ ó¸®
	if(argc!=2)
		print_error(argv[0]);

	// Correct Password Loading
	fp = fopen("/home/guta/QUESTION/Password.txt", "r");
	fgets(password, 40, fp);
	password[strlen(password)-1] = '\0';
	fclose(fp);

	pointer1 = password;
	pointer2 = argv[1];

	// ÀÔ·ÂÇÑ ¹®ÀÚ¿­°ú Correct Password¸¦ ºñ±³
	while(*pointer2){
		if(*(pointer2++) != *(pointer1++)){
			fprintf(stdout, "Password is not correct!\n");
			return -1;
		}
	}

	// ¸Â´Ù¸é ÀÎÁõ Åë°ú
	printf("Wow! You got the new shell\n");
	setreuid(505, 505);
	system("/bin/bash -p");
}