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#pragma pack(4)

#define WIN32_LEAN_AND_MEAN

#include

#include

#include

#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))

void fill_icmp_data(char *, int);

USHORT checksum(USHORT *, int);

void decode_resp(char *,int ,struct sockaddr_in *);

void Usage(char *progname){

fprintf(stderr,"Usage:\n");

fprintf(stderr,"%s [data_size]\n",progname);

fprintf(stderr,"datasize can be up to 1Kb\n");

ExitProcess(STATUS_FAILED);

}

int main(int argc, char **argv){

WSADATA wsaData;

SOCKET sockRaw;

struct sockaddr_in dest,from;

struct hostent * hp;

int bread,datasize;

int fromlen = sizeof(from);

int timeout = 1000;

char *dest_ip;

char *icmp_data;

char *recvbuf;

unsigned int addr=0;

USHORT seq_no = 0;

if (WSAStartup(MAKEWORD(2,1),&wsaData) != 0){

fprintf(stderr,"WSAStartup failed: %d\n",GetLastError());

ExitProcess(STATUS_FAILED);

}

if (argc <2 ) {

Usage(argv[0]);

}

sockRaw = WSASocket (AF_INET,

SOCK_RAW,

IPPROTO_ICMP,

NULL, 0,0);

if (sockRaw == INVALID_SOCKET) {

fprintf(stderr,"WSASocket() failed: %d\n",WSAGetLastError());

ExitProcess(STATUS_FAILED);

}

bread = setsockopt(sockRaw,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,

sizeof(timeout));

if(bread == SOCKET_ERROR) {

fprintf(stderr,"failed to set recv timeout: %d\n",WSAGetLastError());

ExitProcess(STATUS_FAILED);

}

timeout = 1000;

bread = setsockopt(sockRaw,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,

sizeof(timeout));

if(bread == SOCKET_ERROR) {

fprintf(stderr,"failed to set send timeout: %d\n",WSAGetLastError());

ExitProcess(STATUS_FAILED);

}

memset(&dest,0,sizeof(dest));

hp = gethostbyname(argv[1]);

if (!hp){

addr = inet_addr(argv[1]);

}

if ((!hp) && (addr == INADDR_NONE) ) {

fprintf(stderr,"Unable to resolve %s\n",argv[1]);

ExitProcess(STATUS_FAILED);

}

if (hp != NULL)

memcpy(&(dest.sin_addr),hp->h_addr,hp->h_length);

else

dest.sin_addr.s_addr = addr;

if (hp)

dest.sin_family = hp->h_addrtype;

else

dest.sin_family = AF_INET;

dest_ip = inet_ntoa(dest.sin_addr);

if (argc >2) {

datasize = atoi(argv[2]);

if (datasize == 0)

datasize = DEF_PACKET_SIZE;

}

else

datasize = DEF_PACKET_SIZE;

datasize += sizeof(IcmpHeader);

icmp_data = xmalloc(MAX_PACKET);

recvbuf = xmalloc(MAX_PACKET);

if (!icmp_data) {

fprintf(stderr,"HeapAlloc failed %d\n",GetLastError());

ExitProcess(STATUS_FAILED);

}

memset(icmp_data,0,MAX_PACKET);

fill_icmp_data(icmp_data,datasize);

while(1) {

int bwrote;

((IcmpHeader*)icmp_data)->i_cksum = 0;

((IcmpHeader*)icmp_data)->timestamp = GetTickCount();

((IcmpHeader*)icmp_data)->i_seq = seq_no++;

((IcmpHeader*)icmp_data)->i_cksum = checksum((USHORT*)icmp_data,

datasize);

bwrote = sendto(sockRaw,icmp_data,datasize,0,(struct sockaddr*)&dest,

sizeof(dest));

if (bwrote == SOCKET_ERROR){

if (WSAGetLastError() == WSAETIMEDOUT) {

printf("timed out\n");

continue;

}

fprintf(stderr,"sendto failed: %d\n",WSAGetLastError());

ExitProcess(STATUS_FAILED);

}

if (bwrote < datasize ) {

fprintf(stdout,"Wrote %d bytes\n",bwrote);

}

bread = recvfrom(sockRaw,recvbuf,MAX_PACKET,0,(struct sockaddr*)&from,

&fromlen);

if (bread == SOCKET_ERROR){

if (WSAGetLastError() == WSAETIMEDOUT) {

printf("timed out\n");

continue;

}

fprintf(stderr,"recvfrom failed: %d\n",WSAGetLastError());

ExitProcess(STATUS_FAILED);

}

decode_resp(recvbuf,bread,&from);

Sleep(1000);

}

return 0;

}

/*

The response is an IP packet. We must decode the IP header to locate

the ICMP data

*/

void decode_resp(char *buf, int bytes,struct sockaddr_in *from) {

IpHeader *iphdr;

IcmpHeader *icmphdr;

unsigned short iphdrlen;

iphdr = (IpHeader *)buf;

iphdrlen = iphdr->h_len * 4 ; // number of 32-bit words *4 = bytes

if (bytes < iphdrlen + ICMP_MIN) {

printf("Too few bytes from %s\n",inet_ntoa(from->sin_addr));

}

icmphdr = (IcmpHeader*)(buf + iphdrlen);

if (icmphdr->i_type != ICMP_ECHOREPLY) {

fprintf(stderr,"non-echo type %d recvd\n",icmphdr->i_type);

return;

}

if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) {

fprintf(stderr,"someone else's packet!\n");

return ;

}

printf("%d bytes from %s:",bytes, inet_ntoa(from->sin_addr));

printf(" icmp_seq = %d. ",icmphdr->i_seq);

printf(" time: %d ms ",GetTickCount()-icmphdr->timestamp);

printf("\n");

}

USHORT checksum(USHORT *buffer, int size) {

unsigned long cksum=0;

while(size >1) {

cksum+=*buffer++;

size -=sizeof(USHORT);

}

if(size ) {

cksum += *(UCHAR*)buffer;

}

cksum = (cksum >> 16) + (cksum & 0xffff);

cksum += (cksum >>16);

return (USHORT)(~cksum);

}

/*

Helper function to fill in various stuff in our ICMP request.

*/

void fill_icmp_data(char * icmp_data, int datasize){

IcmpHeader *icmp_hdr;

char *datapart;

icmp_hdr = (IcmpHeader*)icmp_data;

icmp_hdr->i_type = ICMP_ECHO;

icmp_hdr->i_code = 0;

icmp_hdr->i_id = (USHORT)GetCurrentProcessId();

icmp_hdr->i_cksum = 0;

icmp_hdr->i_seq = 0;

datapart = icmp_data + sizeof(IcmpHeader);

//

// Place some junk in the buffer.

//

memset(datapart,'E', datasize - sizeof(IcmpHeader));

}