ping.cpp

来自「实现系统自带ping的功能 VC++ 下编译通过」· C++ 代码 · 共 398 行

//#pragma pack(1)

//#define WIN32_LEAN_AND_MEAN
#include <stdio.h>
#include<stdlib.h>
#include <winsock2.h>
//#include 
//#include 

#pragma comment(lib,"ws2_32")

#define IP_RECORD_ROUTE 0x7
// 
// IP header structure
//
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; // 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)

//
// ICMP header structure
//
typedef struct _icmphdr 
{
	BYTE i_type;
	BYTE i_code; // Type sub code
	USHORT i_cksum;
	USHORT i_id;
	USHORT i_seq;
	// This is not the standard header, but we reserve space for time
	ULONG timestamp;
} IcmpHeader;

//
// IP option header - use with socket option IP_OPTIONS
//
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;

//
// Function: usage
//
// Description:
// Print usage information
//
void usage(char *progname)
{
	printf("usage: ping -r [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);
}

// 
// Function: FillICMPData
//
// Description:
// Helper function to fill in various fields for our ICMP request
//
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));
}

// 
// Function: checksum
//
// Description:
// This function calculates the 16-bit one's complement sum
// of the supplied buffer (ICMP) header
//
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);
}
	
//
// Function: DecodeIPOptions
//
// Description:
// If the IP option header is present, find the IP options
// within the IP header and print the record route option
// values
//
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;
}

//
// Function: DecodeICMPHeader
//
// Description:
// The response is an IP packet. We must decode the IP header to
// locate the ICMP data.
//
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: %d 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];
	}
}

//
// Function: main
//
int main(int argc, char **argv)
{
	WSADATA wsaData;
	SOCKET sockRaw = INVALID_SOCKET;
	struct sockaddr_in dest,from;
	int bread,fromlen = sizeof(from),timeout = 1000,ret;
	char *icmp_data = NULL,*recvbuf = NULL;
	unsigned int addr = 0;
	USHORT seq_no = 0;
	struct hostent *hp = NULL;
	IpOptionHeader ipopt;


	if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0)
	{
		printf("WSAStartup() failed: %d\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, SO_ACCEPTCONN, (char *)&ipopt, sizeof(ipopt));
		if (ret == SOCKET_ERROR)
		{
			printf("setsockopt(SO_ACCEPTCONN) failed: %d\n", WSAGetLastError());
		}
	}

	// Set the send/recv timeout values
	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));

	// Resolve the endpoint's name if necessary
	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;
		}
	} 
// 
// Create the ICMP packet
// 
	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: %d\n", GetLastError());
		return -1;
	}

	memset(icmp_data,0,MAX_PACKET);
	FillICMPData(icmp_data,datasize);
//
// Start sending/receiving ICMP packets
//
	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);
	}
// Cleanup
//

	if (sockRaw != INVALID_SOCKET) 
		closesocket(sockRaw);
	HeapFree(GetProcessHeap(), 0, recvbuf);
	HeapFree(GetProcessHeap(), 0, icmp_data);

	WSACleanup();
	return 0;
}