#ifndef _RAWPING_H
#define _RAWPING_H

// ICMP protocol identifier
#define ICMP_PROTO	1

// ICMP packet types
#define PT_ICMP_ECHO_REPLY 0
#define PT_ICMP_DEST_UNREACH 3
#define PT_ICMP_TTL_EXPIRE 11
#define PT_ICMP_ECHO_REQUEST 8
#define PT_ICMP_SOURCE_QUENCH 4

// Minimum ICMP packet size, in bytes
#define ICMP_MIN 8

// The following two structures need to be packed tightly, but unlike
// Borland C++, Microsoft C++ does not do this by default.
#pragma pack(1)

// The IP header
struct IPHeader {
    BYTE h_len:4;           // Length of the header in dwords
    BYTE version:4;         // Version of IP
    BYTE tos;               // Type of service
    USHORT total_len;       // Length of the packet in dwords
    USHORT ident;           // unique identifier
    USHORT flags;           // Flags
    BYTE ttl;               // Time to live
    BYTE proto;             // Protocol number (TCP, UDP etc)
    USHORT checksum;        // IP checksum
    ULONG source_ip;
    ULONG dest_ip;
};

// ICMP header
struct ICMPHeader {
    BYTE type;          // ICMP packet type
    BYTE code;          // Type sub code
    USHORT checksum;
    USHORT id;
    USHORT seq;
};

#pragma pack()

extern USHORT ip_checksum(USHORT* buffer, int size);

extern int init_raw_ping();
extern int raw_ping(char *host, int timeout);
extern int cleanup_raw_ping();

#endif