关于FIN扫描编程
有没有哪位大神懂得C语言的FIN扫描编程？求思路！
[解决办法]
#include "stdio.h"#include "Winsock2.h"#include <ws2tcpip.h> #include "mstcpip.h"#pragma comment(lib,"WS2_32.lib")int Stop = 0;int PortStart = 80;int PortEnd = 81;char *DestIpAddr = "192.168.1.3";typedef struct IpHeader{ unsigned char Version_HLen; unsigned char TOS; unsigned short Length; unsigned short Ident; unsigned short Flags_Offset; unsigned char TTL; unsigned char Protocol; unsigned short Checksum; unsigned int SourceAddr; unsigned int DestinationAddr;} Ip_Header;#define URG 0x20 #define ACK 0x10 #define PSH 0x08 #define RST 0x04 #define SYN 0x02 #define FIN 0x01 typedef struct TcpHeader{ USHORT SrcPort; USHORT DstPort; unsigned int SequenceNum; unsigned int Acknowledgment; unsigned char HdrLen; unsigned char Flags; USHORT AdvertisedWindow; USHORT Checksum; USHORT UrgPtr;} Tcp_Header;int PacketAnalyzer(char*);DWORD WINAPI Send_Net_Packet(LPVOID no);int main(int argc, char **argv){ HANDLE Thread; DWORD ThreadId; SOCKET RecSocket; int Result; char RecvBuf[65535] = { 0 }; LARGE_INTEGER nFreq; char Name[255]; LARGE_INTEGER StartTime; LARGE_INTEGER EndTime; HANDLE hCon; WSADATA wsaData; DWORD dwBufferLen[10]; DWORD dwBufferInLen = 1; DWORD dwBytesReturned = 0; struct hostent *pHostent; Result = WSAStartup(MAKEWORD(2, 1), &wsaData); if (Result == SOCKET_ERROR) { printf("WSAStartup failed with error %d\n", Result); return 0; } RecSocket = socket(AF_INET, SOCK_RAW, IPPROTO_IP); if (Result == SOCKET_ERROR) { printf("socket failed with error %d\n", WSAGetLastError()); closesocket(RecSocket); return 0; } Result = gethostname(Name, 255); if (Result == SOCKET_ERROR) { printf("gethostname failed with error %d\n", WSAGetLastError()); closesocket(RecSocket); return 0; } pHostent = (struct hostent*)malloc(sizeof(struct hostent)); pHostent = gethostbyname(Name); SOCKADDR_IN sock; sock.sin_family = AF_INET; sock.sin_port = htons(5555); memcpy(&sock.sin_addr.S_un.S_addr, pHostent->h_addr_list[0], pHostent->h_length); Result = bind(RecSocket, (PSOCKADDR) &sock, sizeof(sock)); if (Result == SOCKET_ERROR) { printf("bind failed with error %d\n", WSAGetLastError()); closesocket(RecSocket); return 0; } Result = WSAIoctl(RecSocket, SIO_RCVALL, &dwBufferInLen, sizeof(dwBufferInLen), &dwBufferLen, sizeof(dwBufferLen), &dwBytesReturned, NULL, NULL); if (Result == SOCKET_ERROR) { printf("WSAIoctl failed with error %d\n", WSAGetLastError()); closesocket(RecSocket); return 0; } Thread = CreateThread(NULL, 0, Send_Net_Packet, NULL, 0, &ThreadId); if (Thread == NULL) { printf("CreateThread for Send_Net_Packet Error: %d ", GetLastError()); return 0; } hCon = GetStdHandle(STD_OUTPUT_HANDLE); CONSOLE_SCREEN_BUFFER_INFO bInfo; GetConsoleScreenBufferInfo(hCon, &bInfo); if (QueryPerformanceFrequency(&nFreq)) { QueryPerformanceCounter(&StartTime); while (true) { memset(RecvBuf, 0, sizeof(RecvBuf)); Result = recv(RecSocket, RecvBuf, sizeof(RecvBuf), 0); if (Result == SOCKET_ERROR) { printf("recv failed with error %d\n", WSAGetLastError()); closesocket(RecSocket); return 0; } Result = PacketAnalyzer(RecvBuf); if (Result == 0) { printf("PacketAnalyzer failed with error %d\n", Result); closesocket(RecSocket); return 0; } if (Stop == 1) { break; } } SetConsoleTextAttribute(hCon, 14); QueryPerformanceCounter(&EndTime); } double fInterval = EndTime.QuadPart - StartTime.QuadPart; printf("Total Time:%fms\n", fInterval *1000 / (double)nFreq.QuadPart); SetConsoleTextAttribute(hCon, bInfo.wAttributes); if (closesocket(RecSocket) == SOCKET_ERROR) { printf("closesocket failed with error %d\n", WSAGetLastError()); return 0; } if (WSACleanup() == SOCKET_ERROR) { printf("WSACleanup failed with error %d\n", WSAGetLastError()); return 0; } return 1;}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);}DWORD WINAPI Send_Net_Packet(LPVOID no){ typedef struct IpHeader { u_char Version_HLen; u_char TOS; short Length; short Ident; short Flags_Offset; u_char TTL; u_char Protocol; short Checksum; unsigned int SourceAddr; unsigned int DestinationAddr; } Ip_Header; typedef struct tsd_hdr { unsigned long saddr; unsigned long daddr; char mbz; char ptcl; unsigned short tcpl; } PSD_Tcp_Header; typedef struct tcp_hdr { USHORT SrcPort; USHORT DstPort; unsigned int SequenceNum; unsigned int Acknowledgment; unsigned char HdrLen; unsigned char Flags; USHORT AdvertisedWindow; USHORT Checksum; USHORT UrgPtr; } Tcp_Header; struct in_addr localaddr; char HostName[255]; struct hostent *Hostent; WSADATA wsaData; SOCKET SendSocket; SOCKADDR_IN addr_in; Ip_Header ipHeader; Tcp_Header tcpHeader; PSD_Tcp_Header psdHeader; char szSendBuf[100] = { 0 }; BOOL flag; int nTimeOver; int Result; Result = WSAStartup(MAKEWORD(2, 1), &wsaData); if (Result == SOCKET_ERROR) { printf("WSAStartup failed with error %d\n", Result); return 0; } if ((SendSocket = WSASocket(AF_INET, SOCK_RAW, IPPROTO_RAW, NULL, 0, WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET) { printf("WSASocket failed with error %d\n\n", WSAGetLastError()); return false; } flag = true; if (setsockopt(SendSocket, IPPROTO_IP, IP_HDRINCL, (char*) &flag, sizeof(flag)) == SOCKET_ERROR) { printf("setsockopt failed with error %d\n\n", WSAGetLastError()); return false; } nTimeOver = 1000; if (setsockopt(SendSocket, SOL_SOCKET, SO_SNDTIMEO, (char*) &nTimeOver, sizeof(nTimeOver)) == SOCKET_ERROR) { printf("setsockopt failed with error %d\n\n", WSAGetLastError()); return false; } addr_in.sin_family = AF_INET; addr_in.sin_port = htons(1000); addr_in.sin_addr.S_un.S_addr = inet_addr(DestIpAddr); Result = gethostname(HostName, 255); if (Result == SOCKET_ERROR) { printf("gethostname failed with error %d\n", WSAGetLastError()); return 0; } Hostent = (struct hostent*)malloc(sizeof(struct hostent)); Hostent = gethostbyname(HostName); memcpy(&localaddr, Hostent->h_addr_list[0], Hostent->h_length); ipHeader.Version_HLen = (4 << 4 | sizeof(ipHeader) / sizeof(unsigned long)); ipHeader.TOS = 0; ipHeader.Length = htons(sizeof(ipHeader) + sizeof(tcpHeader)); ipHeader.Ident = 1; ipHeader.Flags_Offset = 0; ipHeader.TTL = 128; ipHeader.Protocol = IPPROTO_TCP; ipHeader.Checksum = 0; ipHeader.SourceAddr = localaddr.S_un.S_addr; ipHeader.DestinationAddr = inet_addr(DestIpAddr); for (int p = PortStart; p <= PortEnd; p++) { tcpHeader.DstPort = htons(p); tcpHeader.SrcPort = htons(6666); tcpHeader.SequenceNum = htonl(0x12345678); tcpHeader.Acknowledgment = 0; tcpHeader.HdrLen = (sizeof(tcpHeader) / 4 << 4 | 0); tcpHeader.Flags = 1; tcpHeader.AdvertisedWindow = htons(512); tcpHeader.UrgPtr = 0; tcpHeader.Checksum = 0; psdHeader.saddr = ipHeader.SourceAddr; psdHeader.daddr = ipHeader.DestinationAddr; psdHeader.mbz = 0; psdHeader.ptcl = IPPROTO_TCP; psdHeader.tcpl = htons(sizeof(tcpHeader)); memcpy(szSendBuf, &psdHeader, sizeof(psdHeader)); memcpy(szSendBuf + sizeof(psdHeader), &tcpHeader, sizeof(tcpHeader)); tcpHeader.Checksum = checksum((USHORT*)szSendBuf, sizeof(psdHeader) + sizeof(tcpHeader)); memcpy(szSendBuf, &ipHeader, sizeof(ipHeader)); memcpy(szSendBuf + sizeof(ipHeader), &tcpHeader, sizeof(tcpHeader)); memset(szSendBuf + sizeof(ipHeader) + sizeof(tcpHeader), 0, 4); ipHeader.Checksum = checksum((USHORT*)szSendBuf, sizeof(ipHeader) + sizeof(tcpHeader)); memcpy(szSendBuf, &ipHeader, sizeof(ipHeader)); Result = sendto(SendSocket, szSendBuf, sizeof(ipHeader) + sizeof(tcpHeader), 0, (struct sockaddr*) &addr_in, sizeof(addr_in)); if (Result == SOCKET_ERROR) { printf("gethostname failed with error %d\n", WSAGetLastError()); return 0; } } if (closesocket(SendSocket) == SOCKET_ERROR) { printf("closesocket failed with error %d\n", WSAGetLastError()); return 0; } if (WSACleanup() == SOCKET_ERROR) { printf("WSACleanup failed with error %d\n", WSAGetLastError()); return 0; } return 1;}