Program to Implement Buffer Overflows in C++ Assignment Solution.

Instructions

Objective
Write a C++ assignment program to implement buffer overflows.
Requirements and Specifications

program to implement buffer overflows in C++
Source Code
#include 
#include 
using namespace std;
const int MAX_MEAL = 100;
const int MAX_NAME_LEN = 20;
// Holds a customer data and the next customer after it (Linked list)
struct Customer
{
 char name[MAX_NAME_LEN];
 int numOrders;
 Customer *next;
 // Initialize a customer
 Customer()
 {
 numOrders = 0;
 next = NULL;
 }
};
// Make sure to read a positive int that doesn't overflow
// Since this is a simple application, we shouldn't retrieve an input
// that is more than 100 or below 0. This we we protect the app
// from under or overflow
int readNumOrders()
{
 while (1)
 {
 cout << "Enter the number of meals to order for next customer: ";
 int value;
 // Make sure it's within bounds. When the user enters a very very very
 // large number, it will overflow and it will wrap around but we only
 // accept values that is within 1 to 100 to make the app still work
 // as expected
 if (cin >> value)
 {
 cin.clear();
 cin.ignore();
 if (value >= 1 && value <= MAX_MEAL)
 return value;
 }
 else
 {
 cin.clear();
 cin.ignore();
 }
 cout << "Invalid value." << endl;
 }
}
// Read a name making sure that the number of characters is within the buffer
// bounds. If an overflow is to happen, we will reject all other incoming characters
void readName(char *name)
{
 cout << "Enter customer's name: ";
 int i;
 bool overflowed = true;
 for (i = 0; i < MAX_NAME_LEN - 1; i++)
 {
 char c = fgetc(stdin);
 if (c == '\n')
 {
 overflowed = false;
 break;
 }
 name[i] = c;
 }
 name[i] = '\0';
 if (overflowed)
 {
 // Delete all other incoming characters until we get the new line
 char c;
 while ((c = fgetc(stdin)) != '\n');
 }
 }
// Entry point of the program
int main()
{
 Customer *lastCustomer = NULL;
 // Start with 100 meals prepared
 int mealsLeft = MAX_MEAL;
 // As long as there are meals still available, hey will take an order for a
 // customer
 while (mealsLeft > 0)
 {
 cout << "There are " << mealsLeft << " orders left..." << endl;
 Customer *customer = new Customer();
 customer->numOrders = readNumOrders();
 readName(customer->name);
 if (customer->numOrders <= 0 || customer->numOrders > mealsLeft)
 {
 // If the number of meals ordered exceeds the number of meals still
 // available, decline the order.
 cout << "Invalid number of orders." << endl;
 delete customer;
 }
 else
 {
 // Otherwise, accept the order and reduce the number of meals remaining.
 mealsLeft -= customer->numOrders;
 customer->next = lastCustomer;
 lastCustomer = customer;
 }
 }
 // After all meals are sold, print a recap that shows each customer name and the number of
 // meals they ordered.
 cout << endl;
 cout << "Orders from latest to oldest:" << endl;
 while (lastCustomer != NULL)
 {
 cout << lastCustomer->name << ": " << lastCustomer->numOrders << endl;
 Customer *nextCustomer = lastCustomer->next;
 delete lastCustomer;
 lastCustomer = nextCustomer;
 }
 return 0;
}
Create a Program to Implement Buffer Overflows in C++ Assignment Solution.

Instructions

Requirements and Specifications
