文章评分 次，平均分 ：
- （1）以命令方式运行：DOS>scanHost start_ip end_ip
- （2）输出内容：活动主机IP地址。
实现原理：
- （1）通过某IP发送ICMP_ECHO请求报文，接收到ICMP_response 报文，表明该IP主机活动。
- （2）利用原始套接字
- （3）为了提高检测时间，利用多线程技术。
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#include <iostream> #include <ctime> #include <winsock2.h> #include <cstdlib> #pragma comment (lib, "ws2_32.lib") using namespace std; //ip包头部结构 typedef struct iphdr { unsigned int headlen : 4; //头部长度 unsigned int version : 4; //版本号 unsigned char tos; //服务类型 unsigned short totallen; //总长度 unsigned short id; //ip包id号 unsigned short flag; //标记 unsigned char ttl; //生存时间 unsigned char prot; //协议类型 unsigned short checksum; //校验和 unsigned int sourceIp; //源IP地址 unsigned int destIp; //目的ip地址 }IpHeader; typedef struct icmphdr { BYTE type; //ICMP类型码 BYTE code; //ICMP子类型 USHORT checksum; //校验和 USHORT id; //ICMP包ID号 USHORT seq; //序列号 }IcmpHeader; #define ICMP_ECHO 8 //ICMP回送请求 #define ICMP_ECHO_REPLY 0 //ICMP回送应答 #define ICMP_MIN 8 //ICMP包头长度 #define STATUS_FAILED 0xFFFF //错误码 #define DEF_PACKET_SIZE 32 //缺省数据长度 #define MAX_PACKET 1024 //最大数据长度 #define MAX_PING_PACKET_SIZE MAX_PACKET + sizeof(IpHeader) WSADATA wsaData; SOCKET sockRaw; //原始套接字 struct sockaddr_in dest, from, end1; int fromlen = sizeof(from); //接受ICMP包长度 char* recvbuf = new char[MAX_PING_PACKET_SIZE]; unsigned int addr = 0; //IP地址 long ThreadNumCounter = 0, ThreadNumLimit = 20; long* aa = &ThreadNumCounter; //填充ICMP包的函数 void fill_icmp_data(char* icmp_data, int datasize) { IcmpHeader* icmp_hdr; char* datapart; icmp_hdr = (IcmpHeader*)icmp_data; icmp_hdr->type = ICMP_ECHO; //设置信息类型 icmp_hdr->id = (USHORT)GetCurrentThreadId(); //设置当前线程的ID号 datapart = icmp_data + sizeof(IcmpHeader); //计算ICMP包数据部分 memset(datapart, 'A', datasize - sizeof(IcmpHeader)); } //解析IP地址的函数 void decode_resp(char* buf, int bytes, struct sockaddr_in* from) { IpHeader* iphdr; IcmpHeader* icmphdr; unsigned short iphdrlen; iphdr = (IpHeader*)buf; //跳过IP包头部 iphdrlen = iphdr->headlen * 4; icmphdr = (IcmpHeader*)(buf + iphdrlen); //数据包过短，丢弃 if (bytes < iphdrlen + ICMP_MIN) { return; } //不是回送响应，丢弃 if (icmphdr->type != ICMP_ECHO_REPLY) { return; } //ID号不相符，丢弃 if (icmphdr->id != (USHORT)GetCurrentThreadId()) { return; } //输出处于活动状态的主机 cout << "活动主机: " << inet_ntoa(from->sin_addr) << endl; } //校验和计算函数 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); } //线程调用函数 DWORD WINAPI FindIP(LPVOID pIPAddrTemp) { InterlockedIncrement(aa); char icmp_data[MAX_PACKET]; memset(icmp_data, 0, MAX_PACKET); int datasize = DEF_PACKET_SIZE; datasize += sizeof(IcmpHeader); //填充ICMP包 fill_icmp_data(icmp_data, datasize); ((IcmpHeader*)icmp_data)->checksum = 0; ((IcmpHeader*)icmp_data)->seq = 0; //计算校验和后填入 ((IcmpHeader*)icmp_data)->checksum = checksum((USHORT*)icmp_data, datasize); //发送ICMP包 int bwrote = sendto(sockRaw, icmp_data, datasize, 0, (struct sockaddr*)pIPAddrTemp, sizeof(dest)); int n = 0; if (bwrote == SOCKET_ERROR) { if (WSAGetLastError() == WSAETIMEDOUT) { cout << "time out" << endl; } cout << "Sendto failed: " << WSAGetLastError() << endl; ExitProcess(STATUS_FAILED); n = 1; } if (WSAGetLastError() == WSAETIMEDOUT) { cout << "Timed out" << endl; ExitProcess(STATUS_FAILED); n = 1; } if (bwrote < datasize) { cout << "Wrote " << bwrote << " bytes" << endl; ExitProcess(STATUS_FAILED); n = 1; } //接收ICMP包 int bread = recvfrom(sockRaw, recvbuf, MAX_PING_PACKET_SIZE, 0, (struct sockaddr*)&from, &fromlen); if (bread == SOCKET_ERROR) { if (WSAGetLastError() == WSAETIMEDOUT) { cout << "Timed out" << endl; } cout << "Recvfrom failed: " << WSAGetLastError() << endl; ExitProcess(STATUS_FAILED); n = 1; } //去掉IP包头部，判断并输出IP地址 if (n == 0) { decode_resp(recvbuf, bread, &from); } InterlockedDecrement(aa); return 0; } int main(int argc, char* argv[]) { //检查输入命令格式 if (argc != 3) { cout << "Please input command: ScanHost start_address end_address" << endl; return 0; } //开始使用Ws2_32.dll if (WSAStartup(MAKEWORD(2, 1), &wsaData) != 0) { cout << "WSAStartup failed: " << GetLastError() << endl; ExitProcess(STATUS_FAILED); } //创建原始套接字 sockRaw = WSASocket(AF_INET, SOCK_RAW, IPPROTO_ICMP, NULL, 0, WSA_FLAG_OVERLAPPED); if (sockRaw == INVALID_SOCKET) { cout << "WSASocket() failed: " << WSAGetLastError() << endl; ExitProcess(STATUS_FAILED); } //设置接收延时 int timeout = 1000; int bread = setsockopt(sockRaw, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout)); if (bread == SOCKET_ERROR) { cout << "Failed to set recv timeout: " << WSAGetLastError() << endl; ExitProcess(STATUS_FAILED); } //设置发送延时 timeout = 1000; bread = setsockopt(sockRaw, SOL_SOCKET, SO_RCVTIMEO, (char*)&timeout, sizeof(timeout)); if (bread == SOCKET_ERROR) { cout << "Failed to set recv timeout: " << WSAGetLastError() << endl; ExitProcess(STATUS_FAILED); } //初始化地址结构 memset(&dest, 0, sizeof(dest)); unsigned long startIP, endIP; dest.sin_family = AF_INET; dest.sin_addr.s_addr = inet_addr(argv[1]); startIP = inet_addr(argv[1]); end1.sin_family = AF_INET; end1.sin_addr.s_addr = inet_addr(argv[2]); endIP = inet_addr(argv[2]); HANDLE hThread; while (htonl(startIP) <= htonl(endIP)) { //判断线程数目 if (ThreadNumCounter > ThreadNumLimit) { Sleep(5000); continue; } DWORD ThreadID; sockaddr_in * pIPAddrTemp = new(sockaddr_in); if (!pIPAddrTemp) { cout << "Memory alloc failed" << endl; return 0; } *pIPAddrTemp = dest; //创建新线程 clock_t start; start = clock(); hThread = CreateThread(NULL, NULL, FindIP, (LPVOID)pIPAddrTemp, NULL, &ThreadID); long i = 60000000L; while (i--) ; TerminateThread(hThread, 0); InterlockedDecrement(aa); memset(&from, 0, sizeof(from)); startIP = htonl(htonl(startIP) + 1); dest.sin_addr.s_addr = startIP; } //是否有结束的线程 while (ThreadNumCounter != 0) { Sleep(2000); return 0; } system("pause"); return 0; } |
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转载注明原文出处：王柏元的博客>>https://wangbaiyuan.cn/c-activity-host-scans.html
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