// wire.h
//
// Structures used for sending packets over the wire
//

#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0

#define ICMP_MIN 8 // minimum 8 byte icmp packet (just header)

/* The IP header */
typedef struct iphdr {
	unsigned int h_len:4;          // length of the header
	unsigned int version:4;        // Version of IP
	unsigned char tos;             // Type of service
	unsigned short total_len;      // total length of the packet
	unsigned short ident;          // unique identifier
	unsigned short frag_and_flags; // flags
	unsigned char  ttl; 
	unsigned char proto;           // protocol (TCP, UDP etc)
	unsigned short checksum;       // IP checksum

	unsigned int sourceIP;
	unsigned int destIP;

}IpHeader;

//
// ICMP header
//
typedef struct _ihdr {
  BYTE i_type;
  BYTE i_code; /* type sub code */
  USHORT i_cksum;
  USHORT i_id;
  USHORT i_seq;
  /* This is not the std header, but we reserve space for time */
  ULONG timestamp;
}IcmpHeader;

#define STATUS_FAILED 0xFFFF
#define DEF_PACKET_SIZE 32
#define MAX_PACKET 1024

#define xmalloc(s) HeapAlloc(GetProcessHeap(),HEAP_ZERO_MEMORY,(s))
#define xfree(p)   HeapFree (GetProcessHeap(),0,(p))