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C++扫描指定主机开放的端口，OS提供了connect()系统调用，用于与远程主机某端口建立连接，如果远程主机该端口处于帧听状态，则connect()连接成功；否则说明该端口关闭。
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// ScanPorts.cpp : 定义控制台应用程序的入口点。 // #include "stdafx.h" #include<iostream> using namespace std; #include<WinSock2.h> #pragma comment (lib,"ws2_32.lib") #define STATUS_FALIED 0xFFFF unsigned long serverIP; long MaxThread = 200; long ThreadCount = 0; long *aa = &ThreadCount; //扫描端口的线程 DWORD WINAPI ScanPort(LPVOID lpParam){ short Port = *(short*)lpParam; InterlockedIncrement(aa); //创建流式套接字 SOCKET sock = socket(AF_INET, SOCK_STREAM,0); if (sock == INVALID_SOCKET){ cout << "创建套接字失败！" << endl; return 0; } else{ //填充服务器地址 sockaddr_in severAddr; severAddr.sin_family = AF_INET; severAddr.sin_port = htons(Port); severAddr.sin_addr.S_un.S_addr = serverIP; //判断此机器是否打开 connect(sock, (sockaddr*)&severAddr, sizeof(severAddr)); struct fd_set write; FD_ZERO(&write); FD_SET(sock, &write); //初始化超时时间 struct timeval timeout; timeout.tv_sec = 100 / 1000; timeout.tv_usec = 0; if (select(0,NULL,&write,NULL,&timeout)>0) { cout << Port <<","; }; closesocket(sock); } InterlockedDecrement(aa); return 0; } void main(int argc, char *argv[]) { if (argc != 2){ cout << "请输入目的主机IP地址" << endl; } //建立与socket库的绑定 WSADATA WSAData; if (WSAStartup(MAKEWORD(2, 2), &WSAData) != 0) { cout << "WSAStartup falied!" << GetLastError() << endl; ExitProcess(STATUS_FALIED); } serverIP = inet_addr(argv[1]); cout << "下列端口已开放：" << endl; for (int i = 1; i < 1024; i++){ //超过最大允许线程数等待 while (ThreadCount >= MaxThread) Sleep(10); //创建线程，扫描端口 DWORD ThreadID; CreateThread(NULL, 0, ScanPort, (LPVOID)new short(i), 0, &ThreadID); } //还有没有结束的线程，等待 while (ThreadCount>0) Sleep(50); WSACleanup(); } |
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转载注明原文出处：王柏元的博客>>https://wangbaiyuan.cn/c-scan-specified-host-open-port.html
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