bof.c

#include <string.h>
#include <stdio.h>

int login(char *password) {
	int auth_flag = 0;
	char buffer[16]; 
	strcpy(buffer, password); 

	if (strcmp(buffer,"zeldani") == 0) 
		auth_flag = 1;		
	
	return auth_flag; 
}

int main(int argc, char *argv[]) {
	if(login(argv[1])){
		printf("\nWelcome! :)\n");
	} else {
		printf("\nAccess Denied.\n");
	}
}