soal_pwn_ksl_seleksi/service-diary/diary64bit/diary64.c

//gcc -g -no-pie -fno-stack-protector -fno-pic -fno-builtin diary64.c -o diary64     
#include <stdio.h>
#include <string.h>
#include <limits.h>
 
void not_even_called(){
 printf("\nwelcome garuda muda\n");
 system("/bin/sh");
}

void init(){
setvbuf(stdin, NULL, _IONBF, 0);
setvbuf(stdout, NULL, _IONBF, 0);
setvbuf(stderr, NULL, _IONBF, 0);
}

void tulisan(){
puts("██████╗ ██╗ █████╗ ██████╗ ██╗   ██╗    ███████╗███████╗██████╗ ██╗   ██╗██╗ ██████╗███████╗");
puts("██╔══██╗██║██╔══██╗██╔══██╗╚██╗ ██╔╝    ██╔════╝██╔════╝██╔══██╗██║   ██║██║██╔════╝██╔════╝");
puts("██║  ██║██║███████║██████╔╝ ╚████╔╝     ███████╗█████╗  ██████╔╝██║   ██║██║██║     █████╗  ");
puts("██║  ██║██║██╔══██║██╔══██╗  ╚██╔╝      ╚════██║██╔══╝  ██╔══██╗╚██╗ ██╔╝██║██║     ██╔══╝  ");
puts("██████╔╝██║██║  ██║██║  ██║   ██║       ███████║███████╗██║  ██║ ╚████╔╝ ██║╚██████╗███████╗");
puts("╚═════╝ ╚═╝╚═╝  ╚═╝╚═╝  ╚═╝   ╚═╝       ╚══════╝╚══════╝╚═╝  ╚═╝  ╚═══╝  ╚═╝ ╚═════╝╚══════╝\n");
}

int main()
{
init();
char a[4];
int b;
char c[64];

strcpy(a,"KSL");
b = 14045;

tulisan();
printf("Welcome to Diary Application \n");
printf("write something : ");
gets(c);
if(strlen(c) > 20){
 printf("karakter gak boleh lebih dari 20\n");
} else{
 if(b == 0x67616c66) not_even_called();
 else printf("isi diary kamu : %s\n",c);
}
exit(0);
}