IP数据包解析源程序.doc

#include winsock2.h#include ws2tcpip.h#include #include#include using namespace std;typedef struct _IP_HEADERunionBYTE Version;BYTE HdrLen; BYTE ServiceType;WORD TotalLen;WORD ID;unionWORD Flags;WORD Fragoff;BYTE TimeToLive;BYTE Protocol;WORD HdrChksum;DWORD SrcAddr;DWORD DstAddr;BYTE Options;IP_HEADER;int main ()SOCKET sock; WSADATA wsData;if (WSAStartup(MAKEWORD(2,2), &wsData) != 0)printf(WSAStartup failed!n);return -1;if ( ( sock = socket(AF_INET, SOCK_RAW, IPPROTO_IP) ) = INVALID_SOCKET )printf(create socket failedn);return -1;BOOL flag = true;if ( setsockopt(sock, IPPROTO_IP, IP_HDRINCL,(char*)&flag, sizeof(flag) = SOCKET_ERROR )printf(setsockopt failed!n);return -1;char hostName128;if ( gethostname(hostName, 100) = SOCKET_ERROR )printf(gethostname failed!n);return -1;hostent* pHostIP;if( ( pHostIP = gethostbyname(hostName) ) = NULL )printf(gethostbyname failedn);return -1;sockaddr_in addr_in;addr_in.sin_addr = *(in_addr*)pHostIP-h_addr_list0;addr_in.sin_family = AF_INET;addr_in.sin_port = htons(6000);if ( bind(sock, (PSOCKADDR)&addr_in, sizeof(addr_in) = SOCKET_ERROR )printf(bind failedn);return -1;#define IO_RCVALL _WSAIOW(IOC_VENDOR,1) DWORD dwBufferLen10;DWORD dwBufferInLen = 1;DWORD dwBytesReturned = 0;char buffer100;if ( WSAIoctl(sock, IO_RCVALL, &dwBufferInLen, sizeof(dwBufferInLen),&dwBufferLen, sizeof(dwBufferLen), &dwBytesReturned, NULL, NULL) = SOCKET_ERROR )printf(ioctlsocket faildn);return -1;printf(开始解析经过本机的IP数据包!nn);while ( true )int size = recv(sock, buffer, sizeof(buffer), 0);IP_HEADER ip = *(IP_HEADER *)buffer; cout - endl; cout 版本: 4) endl; cout 头部长度: ( (ip.HdrLen & 0x0f) * 4) endl; cout 服务类型: Priority 5) , Service 1 ) & 0x0f) endl; cout 总长度: ip.TotalLen endl;cout 标识符: ip.ID endl; cout 标志位: 15) & 0x01) , DF = 14) & 0x01) , Mf = 13) &0x01) endl;cout 片偏移: (ip.Fragoff & 0x1fff) endl; cout 生存周期: (int)ip.TimeToLive endl; cout 协议: Protocol (int)ip.Protocol endl; cout 头部校验和: ip.HdrChksum endl; cout 原地址: inet_ntoa(*(in_addr *)&ip.SrcAddr