ip数据包的捕获与解析代码

1、/PackCaptureDlg.h:headerfile#defineIPV4_WERSION4#defineIPV6_WERSION6#defineICMP_PACKET1#defineIGMP_PACKET2#defineTCP_PACKET6#defineEGP_PACKET8#defineUDP_packet17#defineOSPF_PACKET89classCPackCaptureDlg:publicCDialogpublic:/AFX_DATA(CFindHostDlg)enumIDO=IDO_PACKCAPTURE_DIALOG;intm_Count;CStringm_Pack

2、et;/AFX_DATAprotected:/AFX_MSG(CFindHostDlg)afx_msgvoidOnCapture();/AFX_MSGprivate:typedefstructIP_HEAD/IP头部结构unionunsignedcharVersion;/版本(字节前四位)unsignedcharHeadLen;/头部长度(字节后四位);unsignedcharServiceType;/服务类型unsignedshortTotalLen;/总长度unsignedshortIdentifier;/标识符unionunsignedshortFlags;/标志位(字前三位)unsig

3、nedshortFragOffset;/片偏移(字后13位);unsignedcharTimeToLive;/生存周期unsignedcharProtocol;/协议unsignedshortHeadChecksum;/头部校验和unsignedintSourceAddr;/源IP地址unsignedintDestinAddr;/目的IP地址ip_head;typedefstructICMP_HEAD/ICMP头部结构unsignedcharType;/类型unsignedcharCode;/代码unsignedshortHeadChecksum;/头部校验和unsignedshortIden

4、tifior;/标识符unsignedshortSequence;/序号icmp_head;/PackCaptureDlg.cpp:implementationfile#includestdafx.h#includePackCaptureDlg.h#includePackCapture.h#includewinsock2.h#includews2tcpip.h#pragmacomment(lib,ws2_32)#defineIO_RCVALL_WSAIOW(IOC_VENDOR,1)voidCPackCaptureDlg:OnCapture()WSADATAWSAData;/建立与Socket

5、库绑定if(WSAStartup(MAKEWORD(2,2),&WSAData)!=0)MessageBox(WSAStartup初始化失败!);return;SOCKETSocket;/创建原始SocketSocket=socket(AF_INET,SOCK_RAW,IPPROTO_IP);if(Socket=INVALID_SOCKET)MessageBox(创建Socket失败!)；WSACleanup();return；intRecvTime=5000；/设置Socket操作选项if(setsockopt(Socket,SOL_SOCKET,SO_RCVTIMEO,(char*)&Re

6、cvTime,sizeof(RecvTime)=SOCKET_ERROR)MessageBox(设置Socket选项失败！)；closesocket(Socket)；WSACleanup()；return；charHostName128；/获得本地主机名称if(gethostname(HostName,128)=SOCKET_ERROR)MessageBox(获得主机名失败！)；closesocket(Socket)；WSACleanup()；return；hostent*pHostent；/获得本地主机IP地址pHostent=gethostbyname(HostNmae)；if(pHost

7、ent=NULL)MessageBox(获得主机地址失败！)；closesocket(Socket)；WSACleanup()；return；sockaddr_inHostAddr；/定义Socket地址结构memset(&HostAddr,0,sizeof(HostAddr)；HostAddr.sin_family=AF_INET；HostAddr.sin_addr.s_addr=(*(in_addr*)pHostent-h_addr).s_addr；intnBind；/绑定Socket与网卡nBind=bind(Socket,(PSOCKADDR)&HostAddr,sizeof(Host

8、Addr)；if(nBind=SOCKET_ERROR)MessageBox(绑定Socket失败！”)；closesocket(Socket)；WSACleanup();return;DWORDdwValue=1;/设置Socket接受模式if(ioctlsocket(Socket,IO_RCVALL,&dwValue)=SOCKET_ERROR)MessageBox(设置Socket接收器失败！)；closesocket(Socket);WSACleanup()；return；UpdateData(true)；m_Packet=版本总长度标志位片偏移协议源地址目的地址內;for(inti=

9、0；i4)=IPV4_VERSION)STR.Format(IPv4);if(IpHead.Version4)=IPV6_VERSION)STR.Format(IPv6);m_Packet+=str;str.Format(%u,ntohs(IpHead.TotalLen);m_Packet+=str;str.Format(D=%uM=%u,(ntohs(IpHead.Flags)14)&0 x01,(btohs(IpHead.Flags)13)&0 x01);m_Packet+=str;str.Format(%u,ntohs(IpHead.Fragoffset)&0 x1fff);m_Packet+=str;switch(IpHead.Protocol)caseICMP_PACKET:str.Format(ICMP);break;caseIGMP_PACKET:str.Format(IGMP);break;caseTCP_PACKET:str.Format(TCP);break;caseEGP_PACKET:str.Format(EGP);break;caseUDP_PACKET:str.Format(UDP);break;caseOSPF_PACKET:str.Format(OSPF);break;m_Packet+=str;str.Format(