// Ping.c
// Ping [host] [packet-size]
//
// host String name of host to ping
// packet-size Integer size of packet to send
// (smaller than 1024 bytes)
#define WIN32_LEAN_AND_MEAN
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>
#pragma comment(lib,"ws2_32.lib")
#define IP_RECORD_ROUTE 0x7
typedef struct _iphdr { //ip数据报头部
unsigned int h_len: 4; // Length of the header
unsigned int version: 4; // Version of IP-版本号
unsigned char tos; // Type of service-服务种类
unsigned short total_len; // Total length of the packet
unsigned short ident; // Unique identifier
unsigned short frag_and_flags; // Flags
unsigned char ttl; // Time to live
unsigned char proto; // Protocol (TCP, UDP etc)
unsigned short checksum; // IP checksum
unsigned int sourceIP;
unsigned int destIP;
} IpHeader;
#define ICMP_ECHO 8
#define ICMP_ECHOREPLY 0
#define ICMP_MIN 8 // Minimum 8-byte ICMP packet (header)
typedef struct _icmphdr {
BYTE i_type;
BYTE i_code; // Type sub code
USHORT i_cksum;
USHORT i_id;
USHORT i_seq;
ULONG timestamp;
} IcmpHeader;
typedef struct _ipoptionhdr {
unsigned char code; // Option type
unsigned char len; // Length of option hdr
unsigned char ptr; // Offset into options
unsigned long addr[9]; // List of IP addrs
} IpOptionHeader;
#define DEF_PACKET_SIZE 32 // Default packet size
#define MAX_PACKET 1024 // Max ICMP packet size
#define MAX_IP_HDR_SIZE 60 // Max IP header size w/options
BOOL bRecordRoute;
int datasize;
char *lpdest;
void usage(char *progname)
{
printf("usage: ping -r <host> [data size]\n");
printf(" -r record route\n");
printf(" host remote machine to ping\n");
printf(" datasize can be up to 1KB\n");
ExitProcess(-1);
}
void FillICMPData(char *icmp_data, int datasize)
{
IcmpHeader *icmp_hdr = NULL;
char *datapart = NULL;
icmp_hdr = (IcmpHeader*)icmp_data;
icmp_hdr->i_type = ICMP_ECHO; // Request an 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));
}
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);
}
void DecodeIPOptions(char *buf, int bytes)
{
IpOptionHeader *ipopt = NULL;
IN_ADDR inaddr;
int i;
HOSTENT *host = NULL;
ipopt = (IpOptionHeader *)(buf + 20);
printf("RR: ");
for (i = 0; i < (ipopt->ptr / 4) - 1; i++) {
inaddr.S_un.S_addr = ipopt->addr[i];
if (i != 0)
printf(" ");
host = gethostbyaddr((char *)&inaddr.S_un.S_addr,
sizeof(inaddr.S_un.S_addr), AF_INET);
if (host)
printf("(%-15s) %s\n", inet_ntoa(inaddr), host->h_name);
else
printf("(%-15s)\n", inet_ntoa(inaddr));
}
return;
}
void DecodeICMPHeader(char *buf, int bytes, struct sockaddr_in *from)
{
IpHeader *iphdr = NULL;
IcmpHeader *icmphdr = NULL;
unsigned short iphdrlen;
DWORD tick;
static int icmpcount = 0;
iphdr = (IpHeader *)buf;
// Number of 32-bit words * 4 = bytes
iphdrlen = iphdr->h_len * 4;
tick = GetTickCount();
if ((iphdrlen == MAX_IP_HDR_SIZE) && (!icmpcount))
DecodeIPOptions(buf, 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) {
printf("nonecho type %d recvd\n", icmphdr->i_type);
return;
}
// Make sure this is an ICMP reply to something we sent!
//
if (icmphdr->i_id != (USHORT)GetCurrentProcessId()) {
printf("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: %lu ms", tick - icmphdr->timestamp);
printf("\n");
icmpcount++;
return;
}
void ValidateArgs(int argc, char **argv)
{
int i;
bRecordRoute = FALSE;
lpdest = NULL;
datasize = DEF_PACKET_SIZE;
for (i = 1; i < argc; i++) {
if ((argv[i][0] == '-') || (argv[i][0] == '/')) {
switch (tolower(argv[i][1])) {
case 'r': // Record route option
bRecordRoute = TRUE;
break;
default:
usage(argv[0]);
break;
}
} else if (isdigit(argv[i][0]))
datasize = atoi(argv[i]);
else
lpdest = argv[i];
}
}
int main(int argc, char **argv)
{
WSADATA wsaData;
SOCKET sockRaw = INVALID_SOCKET;
struct sockaddr_in dest;
struct sockaddr_in from;
int bread;
int fromlen = sizeof(from);
int timeout = 1000;
int ret;
char *icmp_data = NULL;
char *recvbuf = NULL;
USHORT seq_no = 0;
struct hostent *hp = NULL;
IpOptionHeader ipopt;
if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0) {
printf("WSAStartup() failed: %ld\n", GetLastError());
return -1;
}
ValidateArgs(argc, argv);
sockRaw = WSASocket (AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0,
WSA_FLAG_OVERLAPPED);
if (sockRaw == INVALID_SOCKET) {
printf("WSASocket() failed: %d\n", WSAGetLastError());
return -1;
}
if (bRecordRoute) {
// Setup the IP option header to go out on every ICMP packet
//
ZeroMemory(&ipopt, sizeof(ipopt));
ipopt.code = IP_RECORD_ROUTE; // Record route option
ipopt.ptr = 4; // Point to the first addr offset
ipopt.len = 39; // Length of option header
ret = setsockopt(sockRaw, IPPROTO_IP, IP_OPTIONS,
(char *)&ipopt, sizeof(ipopt));
if (ret == SOCKET_ERROR) {
printf("setsockopt(IP_OPTIONS) failed: %d\n",
WSAGetLastError());
}
}
bread = setsockopt(sockRaw, SOL_SOCKET, SO_RCVTIMEO,
(char*)&timeout, sizeof(timeout));
if (bread == SOCKET_ERROR) {
printf("setsockopt(SO_RCVTIMEO) failed: %d\n",
WSAGetLastError());
return -1;
}
timeout = 1000;
bread = setsockopt(sockRaw, SOL_SOCKET, SO_SNDTIMEO,
(char*)&timeout, sizeof(timeout));
if (bread == SOCKET_ERROR) {
printf("setsockopt(SO_SNDTIMEO) failed: %d\n",
WSAGetLastError());
return -1;
}
memset(&dest, 0, sizeof(dest));
dest.sin_family = AF_INET;
if ((dest.sin_addr.s_addr = inet_addr(lpdest)) == INADDR_NONE) {
if ((hp = gethostbyname(lpdest)) != NULL) {
memcpy(&(dest.sin_addr), hp->h_addr, hp->h_length);
dest.sin_family = hp->h_addrtype;
printf("dest.sin_addr = %s\n", inet_ntoa(dest.sin_addr));
} else {
printf("gethostbyname() failed: %d\n",
WSAGetLastError());
return -1;
}
}
datasize += sizeof(IcmpHeader);
icmp_data = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
MAX_PACKET);
recvbuf = (char*)HeapAlloc(GetProcessHeap(), HEAP_ZERO_MEMORY,
MAX_PACKET);
if (!icmp_data) {
printf("HeapAlloc() failed: %ld\n", GetLastError());
return -1;
}
memset(icmp_data,0,MAX_PACKET);
FillICMPData(icmp_data,datasize);
while (1) {
static int nCount = 0;
int bwrote;
if (nCount++ == 4)
break;
((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;
}
printf("sendto() failed: %d\n", WSAGetLastError());
return -1;
}
if (bwrote < datasize) {
printf("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;
}
printf("recvfrom() failed: %d\n", WSAGetLastError());
return -1;
}
DecodeICMPHeader(recvbuf, bread, &from);
Sleep(1000);
}
if (sockRaw != INVALID_SOCKET)
closesocket(sockRaw);
HeapFree(GetProcessHeap(), 0, recvbuf);
HeapFree(GetProcessHeap(), 0, icmp_data);
WSACleanup();
return 0;
}
//先转上源码，稍后详细解析一下
//对windows的socket不熟悉啊，好好研究下...