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Ping测试网络连接状况

2016-04-06 22:31 543 查看
.h文件:

#ifndef CPING_H
#define CPING_H

#include <windows.h>
//这里需要导入库 Ws2_32.lib,在不同的IDE下可能不太一样
#pragma comment(lib, "Ws2_32.lib")

#define DEF_PACKET_SIZE 32
#define ECHO_REQUEST 8
#define ECHO_REPLY 0

struct IPHeader
{
BYTE m_byVerHLen; //4位版本+4位首部长度
BYTE m_byTOS; //服务类型
USHORT m_usTotalLen; //总长度
USHORT m_usID; //标识
USHORT m_usFlagFragOffset; //3位标志+13位片偏移
BYTE m_byTTL; //TTL
BYTE m_byProtocol; //协议
USHORT m_usHChecksum; //首部检验和
ULONG m_ulSrcIP; //源IP地址
ULONG m_ulDestIP; //目的IP地址
};

struct ICMPHeader
{
BYTE m_byType; //类型
BYTE m_byCode; //代码
USHORT m_usChecksum; //检验和
USHORT m_usID; //标识符
USHORT m_usSeq; //序号
ULONG m_ulTimeStamp; //时间戳(非标准ICMP头部)
};

struct PingReply
{
USHORT m_usSeq;
DWORD m_dwRoundTripTime;
DWORD m_dwBytes;
DWORD m_dwTTL;
};

class CPing
{
public:
CPing();
~CPing();
BOOL Ping(DWORD dwDestIP, PingReply *pPingReply = NULL, DWORD dwTimeout = 2000);
BOOL Ping(char *szDestIP, PingReply *pPingReply = NULL, DWORD dwTimeout = 2000);
private:
BOOL PingCore(DWORD dwDestIP, PingReply *pPingReply, DWORD dwTimeout);
USHORT CalCheckSum(USHORT *pBuffer, int nSize);
ULONG GetTickCountCalibrate();
private:
SOCKET m_sockRaw;
WSAEVENT m_event;
USHORT m_usCurrentProcID;
char *m_szICMPData;
BOOL m_bIsInitSucc;
private:
static USHORT s_usPacketSeq;
};
#endif


.cpp文件:

#include "stdafx.h"
#include "CPing.h"

USHORT CPing::s_usPacketSeq = 0;
CPing::CPing() :
m_szICMPData(NULL),
m_bIsInitSucc(FALSE)
{
WSADATA WSAData;
WSAStartup(MAKEWORD(1, 1), &WSAData);

m_event = WSACreateEvent();
m_usCurrentProcID = (USHORT)GetCurrentProcessId();

if ((m_sockRaw = WSASocket(AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0, 0)) != SOCKET_ERROR)
{
WSAEventSelect(m_sockRaw, m_event, FD_READ);
m_bIsInitSucc = TRUE;

m_szICMPData = (char*)malloc(DEF_PACKET_SIZE + sizeof(ICMPHeader));

if (m_szICMPData == NULL)
{
m_bIsInitSucc = FALSE;
}
}
}

CPing::~CPing()
{
WSACleanup();

if (NULL != m_szICMPData)
{
free(m_szICMPData);
m_szICMPData = NULL;
}
}

BOOL CPing::Ping(DWORD dwDestIP, PingReply *pPingReply, DWORD dwTimeout)
{
return PingCore(dwDestIP, pPingReply, dwTimeout);
}

BOOL CPing::Ping(char *szDestIP, PingReply *pPingReply, DWORD dwTimeout)
{
if (NULL != szDestIP)
{
return PingCore(inet_addr(szDestIP), pPingReply, dwTimeout);
}
return FALSE;
}

BOOL CPing::PingCore(DWORD dwDestIP, PingReply *pPingReply, DWORD dwTimeout)
{
//判断初始化是否成功
if (!m_bIsInitSucc)
{
return FALSE;
}

//配置SOCKET
sockaddr_in sockaddrDest;
sockaddrDest.sin_family = AF_INET;
sockaddrDest.sin_addr.s_addr = dwDestIP;
int nSockaddrDestSize = sizeof(sockaddrDest);

//构建ICMP包
int nICMPDataSize = DEF_PACKET_SIZE + sizeof(ICMPHeader);
ULONG ulSendTimestamp = GetTickCountCalibrate();
USHORT usSeq = ++s_usPacketSeq;
memset(m_szICMPData, 0, nICMPDataSize);
ICMPHeader *pICMPHeader = (ICMPHeader*)m_szICMPData;
pICMPHeader->m_byType = ECHO_REQUEST;
pICMPHeader->m_byCode = 0;
pICMPHeader->m_usID = m_usCurrentProcID;
pICMPHeader->m_usSeq = usSeq;
pICMPHeader->m_ulTimeStamp = ulSendTimestamp;
pICMPHeader->m_usChecksum = CalCheckSum((USHORT*)m_szICMPData, nICMPDataSize);

//发送ICMP报文
if (sendto(m_sockRaw, m_szICMPData, nICMPDataSize, 0, (struct sockaddr*)&sockaddrDest, nSockaddrDestSize) == SOCKET_ERROR)
{
return FALSE;
}

//判断是否需要接收相应报文
if (pPingReply == NULL)
{
return TRUE;
}

char recvbuf[256] = {"\0"};
while (TRUE)
{
//接收响应报文
if (WSAWaitForMultipleEvents(1, &m_event, FALSE, 100, FALSE) != WSA_WAIT_TIMEOUT)
{
WSANETWORKEVENTS netEvent;
WSAEnumNetworkEvents(m_sockRaw, m_event, &netEvent);

if (netEvent.lNetworkEvents & FD_READ)
{
ULONG nRecvTimestamp = GetTickCountCalibrate();
int nPacketSize = recvfrom(m_sockRaw, recvbuf, 256, 0, (struct sockaddr*)&sockaddrDest, &nSockaddrDestSize);
if (nPacketSize != SOCKET_ERROR)
{
IPHeader *pIPHeader = (IPHeader*)recvbuf;
USHORT usIPHeaderLen = (USHORT)((pIPHeader->m_byVerHLen & 0x0f) * 4);
ICMPHeader *pICMPHeader = (ICMPHeader*)(recvbuf + usIPHeaderLen);

if (pICMPHeader->m_usID == m_usCurrentProcID //是当前进程发出的报文
&& pICMPHeader->m_byType == ECHO_REPLY //是ICMP响应报文
&& pICMPHeader->m_usSeq == usSeq //是本次请求报文的响应报文
)
{
pPingReply->m_usSeq = usSeq;
pPingReply->m_dwRoundTripTime = nRecvTimestamp - pICMPHeader->m_ulTimeStamp;
pPingReply->m_dwBytes = nPacketSize - usIPHeaderLen - sizeof(ICMPHeader);
pPingReply->m_dwTTL = pIPHeader->m_byTTL;
return TRUE;
}
}
}
}
//超时
if (GetTickCountCalibrate() - ulSendTimestamp >= dwTimeout)
{
return FALSE;//判断网络是否畅通
}
}
}

USHORT CPing::CalCheckSum(USHORT *pBuffer, int nSize)
{
unsigned long ulCheckSum=0;
while(nSize > 1)
{
ulCheckSum += *pBuffer++;
nSize -= sizeof(USHORT);
}
if(nSize )
{
ulCheckSum += *(UCHAR*)pBuffer;
}

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

return (USHORT)(~ulCheckSum);
}

ULONG CPing::GetTickCountCalibrate()
{
static ULONG s_ulFirstCallTick = 0;
static LONGLONG s_ullFirstCallTickMS = 0;

SYSTEMTIME systemtime;
FILETIME filetime;
GetLocalTime(&systemtime);
SystemTimeToFileTime(&systemtime, &filetime);
LARGE_INTEGER liCurrentTime;
liCurrentTime.HighPart = filetime.dwHighDateTime;
liCurrentTime.LowPart = filetime.dwLowDateTime;
LONGLONG llCurrentTimeMS = liCurrentTime.QuadPart / 10000;

if (s_ulFirstCallTick == 0)
{
s_ulFirstCallTick = GetTickCount();
}
if (s_ullFirstCallTickMS == 0)
{
s_ullFirstCallTickMS = llCurrentTimeMS;
}

return s_ulFirstCallTick + (ULONG)(llCurrentTimeMS - s_ullFirstCallTickMS);
}
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