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【网络编程】之十三、ping程序实现
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使用原始套接字：SOCK_RAW
需要ICMP
代碼如下：
[cpp]?view plaincopy
#include<iostream>?? #include<WinSock2.h>?? ?? using?namespace?std;?? ?? #pragma?comment(lib,?"WS2_32.lib")?? ?? typedef?struct?icmp_hdr{?? ????unsigned?char?icmp_type;?? ????unsigned?char?icmp_code;?? ????unsigned?short?icmp_checksum;?? ????unsigned?short?icmp_id;?? ????unsigned?short?icmp_sequence;?? ????unsigned?long?icmp_timnestamp;?? }ICMP_HDR,?*PICMP_HDR;?? ?? ?? typedef?struct?_IPHeader{?? ????UCHAR?iphVerLen;?? ????UCHAR?ipTOS;?? ????USHORT?ipLength;?? ????USHORT?ipID;?? ????USHORT?ipFlags;?? ????UCHAR?ipTTL;?? ????UCHAR?ipProtocol;?? ????USHORT?ipChecksum;?? ????ULONG?ipSource;?? ????ULONG?ipDestination;?? }IPHeader,?*PIPHeader;?? ?? 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);?? }?? ?? int?main(void)?? {?? ????char?szDestIp[]?=?"127.0.0.1";?? ????SOCKET?sRaw=?::socket(AF_INET,?SOCK_RAW,?IPPROTO_ICMP);?? ?????? ?? ????SOCKADDR_IN?dest;?? ????dest.sin_family?=?AF_INET;?? ????dest.sin_port?=?htons(5674);?? ????dest.sin_addr.S_un.S_addr?=?inet_addr(szDestIp);?? ?????? ????char?buff[sizeof(ICMP_HDR)?+?32];?? ????ICMP_HDR?*pIcmp?=?(ICMP_HDR*)buff;?? ????pIcmp->icmp_type?=?8;?? ????pIcmp->icmp_code?=?0;?? ????pIcmp->icmp_id?=?(USHORT)::GetCurrentProcess();?? ????pIcmp->icmp_checksum?=?0;?? ????pIcmp->icmp_sequence?=?0;?? ????memset(&buff[sizeof(ICMP_HDR)],?'E',?32);?? ?????? ?????? ????USHORT?nSeq?=?0;?? ????char?recvBuf[1024];?? ????SOCKADDR_IN?from;?? ????int?nLen?=?sizeof(from);?? ????while(TRUE)?? ????{?? ????????static?int?nCount?=?0;?? ????????int?nRet;?? ????????if(nCount++?==?4)?? ????????????break;?? ????????pIcmp->icmp_checksum?=?0;?? ????????pIcmp->icmp_timnestamp?=?::GetTickCount();?? ????????pIcmp->icmp_sequence?=?nSeq++;?? ????????pIcmp->icmp_checksum?=?checksum((USHORT*)buff,?sizeof(ICMP_HDR)?+?32);?? ????????nRet?=?::sendto(sRaw,?buff,?sizeof(ICMP_HDR)?+?32,?0,?(SOCKADDR*)&dest,?sizeof(dest));?? ????????if(nRet?==?SOCKET_ERROR)?? ????????{?? ????????????cout?<<?"sendto?error:"?<<?::WSAGetLastError()?<<?endl;?? ????????????return?-1;?? ????????}?? ?? ????????nRet?=?::recvfrom(sRaw,?recvBuf,?1024,?0,?(sockaddr*)&from,?&nLen);?? ????????if(nRet?==?SOCKET_ERROR)?? ????????{?? ????????????if(::WSAGetLastError()?==?WSAETIMEDOUT)?? ????????????{?? ????????????????cout?<<?"time?out"?<<?endl;?? ????????????????continue;?? ????????????}?? ????????????cout?<<?"recvfrom?failed:"?<<?::WSAGetLastError()?<<?endl;?? ????????????return?-1;?? ????????}?? ?? ?????????? ????????int?nTick?=?::GetTickCount();?? ????????if(nRet?<?sizeof(IPHeader)?+?sizeof(ICMP_HDR))?? ????????{?? ????????????cout?<<?"Too?few?bytes?from?"?<<?::inet_ntoa(from.sin_addr)?<<?endl;?? ????????}?? ?? ????????ICMP_HDR?*pRecvIcmp?=?(ICMP_HDR*)(recvBuf?+?sizeof(IPHeader));?? ????????if(pRecvIcmp->icmp_type?!=?0)?? ????????{?? ????????????cout?<<?"nonecho?type?"?<<?pRecvIcmp->icmp_type?<<?"?recvd"?<<?endl;?? ????????????return?-1;?? ????????}?? ????????if(pRecvIcmp->icmp_id?!=?::GetCurrentProcessId())?? ????????{?? ????????????cout?<<?"someone?ele's?packet!"?<<?endl;?? ????????????return?-1;?? ????????}?? ?? ????????cout?<<?nRet?<<?"?bytes?from?"?<<?inet_ntoa(from.sin_addr)?;?? ????????cout?<<?"icmp_seq?=?"?<<?pRecvIcmp->icmp_sequence?;?? ????????cout?<<?"time:?"?<<?nTick?-?pRecvIcmp->icmp_timnestamp?<<?"?ms";?? ????????cout?<<?endl;?? ????????Sleep(1000);?? ????}?? ?? ?? ????return?0;?? }??
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?jofranks ?13.7.24 于南昌
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