#include "General.h"
#include <stdio.h>

USHORT ip_checksum(USHORT* buffer, int size)
{
    unsigned long cksum = 0;
   
    // Sum all the words together, adding the final byte if size is odd
    while (size > 1) {
        cksum += *buffer++;
        size -= sizeof(USHORT);
    }
    if (size) {
        cksum += *(UCHAR*)buffer;
    }

    // Do a little shuffling
    cksum = (cksum >> 16) + (cksum & 0xffff);
    cksum += (cksum >> 16);
   
    // Return the bitwise complement of the resulting mishmash
    return (USHORT)(~cksum);
}

void ReadIPAddress(unsigned long IPAddress)
{
    printf("%d.%d.%d.%d\n", UCHAR(IPAddress),
                                       UCHAR(IPAddress >> 8),
                                       UCHAR(IPAddress >> 16),
                                       UCHAR(IPAddress >> 24));
}

----------------------------------------------------------------------------------------------------------

ICMP.h

#include <windows.h>
#ifndef __ICMP_H__
#define __ICMP_H__

#define ICMP_ECHO 8               // Echo ICMP Packet
#define ICMP_REPLAY 0             // Replay ICMP Packet
#define MAX_DATA_SIZE 1024         
#define ICMP_MIN 8                
#define ICMP_TIMEOUT 11           // Time out ICMP Packet
#define DEFAULT_ICMP_SIZE 44      // The Default ICMP Packet Size

#pragma pack(1)
typedef struct tagICMPHeader
{
    UCHAR type;
    UCHAR code;
    USHORT checkSum;
    USHORT ID;
    USHORT SeqNumber;
}ICMPHeader, *PICMPHeader;
#pragma pack()

#pragma pack(1)
typedef struct tagIPHeader
{
    BYTE h_len:4;
    BYTE version:4;
    BYTE tos;
    USHORT total_len;
    USHORT ID;
    USHORT flags;
    BYTE ttl;
    BYTE proto;
    USHORT checksum;
    ULONG source_ip;
    ULONG dest_ip;
}IPHeader, *PIPHeader;
#pragma pack()

#endif  // ICMP_H

-------------------------------------------------------------------------------------------------------

Tracert.h

#include "ICMP.H"
#include "General.h"
#include <iostream>
using namespace std;

#ifndef __TRACERT_H__
#define __TRACERT_H__

#define TRACERT_DATA_PART_SIZE (DEFAULT_ICMP_SIZE - sizeof(ICMPHeader))
#pragma pack(1)
typedef struct tagTracertPacket
{
    ICMPHeader icmp_header;
    BYTE data_part[TRACERT_DATA_PART_SIZE];
}TracertPacket, *PTracertPacket;
#pragma pack()

class Tracert
{
public:
    Tracert();
    ~Tracert();
    BOOL StartClient();

private:
    void PackTracertPacket(TracertPacket& tracert_packet);
    int UnPackTracertPacketPacket();
    int Configuration();
    int ReceivePacket();
    int SendPacket();
    DWORD InitializeConnection();
    int UnitializeConnection();
    int DecodeTracertPacket(const IPHeader& ip_header, const int recvPacketLen);
    friend USHORT ip_checksum(USHORT* buffer, int size);
    friend void ReadIPAddress(unsigned long IPAddress);

private:
    SOCKET sock;
    sockaddr_in dest;
    sockaddr_in source;
};

#endif  // TRACERT_H