tError());
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);

if (!hp){
addr = inet_addr(argv);
}
if ((!hp) && (addr == INADDR_NONE) ) {
fprintf(stderr,"Unable to resolve %s\n",argv);
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);
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");
re