怎样检测主机上的端口是否开放
我想写一个程序，隔一段时间去扫描一下几台主机的端口是否工作正常（比如80端口、1433端口等），不知用何控件比较简单实现。有源代码就更好啦
[解决办法]
http://download.csdn.net/source/1625991
这里有个现成的 嘿嘿。
[解决办法]
//---------------------------------------#ifndef uGetAllListH#define uGetAllListH#include "iphlpapi.h"#include "winsock.hpp"#pragma link "C:\\Program Files\\Borland\\CBuilder6\\Lib\\Psdk\\iphlpapi.lib"//---------------------------------------String strTcpState[] ={ "未知状态", "已经关闭", "监听中", "同步发送", "同步接收", "已建立", "FIN_WAIT", "FIN_WAIT2", "等待关闭", "正在关闭", "LAST_ACK", "超时", "DELETE_TCB"};static PMIB_TCPTABLE pTcpTable;static PMIB_UDPTABLE pUdpTable;//---------------------------------------// 解析IP，根据IP地址获取主机名称String __fastcall GetHost(UINT unIpAddr){ PHostEnt pHostEnt; TInAddr iaInAddr; String strRet; if(unIpAddr == 0) strRet = "0.0.0.0"; else { Application->ProcessMessages(); iaInAddr.S_un.S_addr = unIpAddr; strRet = strRet.sprintf("%d.%d.%d.%d", BYTE(iaInAddr.S_un.S_un_b.s_b1), BYTE(iaInAddr.S_un.S_un_b.s_b2), BYTE(iaInAddr.S_un.S_un_b.s_b3), BYTE(iaInAddr.S_un.S_un_b.s_b4)); } return strRet;}//---------------------------------------// 根据连接类型，获取端口的描述String __fastcall GetPort(UINT unPort, char *pcProto){ PServEnt pServEnt; Application->ProcessMessages(); pServEnt = getservbyport(htons(unPort), pcProto); if(pServEnt != NULL) return String(unPort) + "(" + String(pServEnt->s_name) + ")"; else return String(IntToStr(unPort));};//---------------------------------------// 获取TCP链接的信息void __fastcall MyGetTcpTable(TListView *lv){ DWORD dwRetVal; DWORD dwLocalPort, dwLocalAddr, dwRemotePort, dwRemoteAddr; if(pTcpTable != NULL) GlobalFree(pTcpTable); pTcpTable = (MIB_TCPTABLE *)GlobalAlloc(GMEM_SHARE, sizeof(MIB_TCPTABLE)); DWORD dwSize = 0; // Make an initial call to GetTcpTable to // get the necessary size into the dwSize variable if(GetTcpTable(pTcpTable, &dwSize, TRUE) == ERROR_INSUFFICIENT_BUFFER) { GlobalFree(pTcpTable); pTcpTable = (MIB_TCPTABLE *)GlobalAlloc(GMEM_SHARE, (UINT)dwSize); } // Make a second call to GetTcpTable to get // the actual data we require dwRetVal = GetTcpTable(pTcpTable, &dwSize, TRUE); if(dwRetVal== NO_ERROR) { for(int i = 0; i < (int) pTcpTable->dwNumEntries; i++) { dwLocalPort = pTcpTable->table[i].dwLocalPort / 256 + (pTcpTable->table[i].dwLocalPort % 256) * 256; dwLocalAddr = pTcpTable->table[i].dwLocalAddr; dwRemotePort = pTcpTable->table[i].dwRemotePort / 256 + (pTcpTable->table[i].dwRemotePort % 256) * 256; dwRemoteAddr = pTcpTable->table[i].dwRemoteAddr; TListItem *pItem = lv->Items->Add(); pItem->Caption = String(i + 1); pItem->SubItems->Add("TCP"); pItem->SubItems->Add(GetHost(dwLocalAddr) + ":" + String(dwLocalPort)); pItem->SubItems->Add(GetHost(dwRemoteAddr) + ":" + String(dwRemotePort)); pItem->SubItems->Add(strTcpState[pTcpTable->table[i].dwState]); pItem->ImageIndex = pTcpTable->table[i].dwState == 11 ? 1: 0; pItem->SubItems->Add("本地端口:" + GetPort(dwLocalPort, "TCP") + " 远程端口:" + GetPort(dwRemotePort, "TCP")); } } else { MessageBox(Application->Handle, SysErrorMessage(GetLastError()).c_str() , Application->Title.c_str(), MB_OK | MB_ICONERROR); }}//---------------------------------------// 获取UDP连接的信息void __fastcall MyGetUdpTable(TListView *lv){ DWORD dwRetVal; DWORD dwLocalPort, dwLocalAddr; if(pUdpTable != NULL) GlobalFree(pUdpTable); pUdpTable = (MIB_UDPTABLE *)GlobalAlloc(GMEM_SHARE, sizeof(MIB_UDPTABLE)); DWORD dwSize = 0; // Make an initial call to GetTcpTable to // get the necessary size into the dwSize variable if(GetUdpTable(pUdpTable, &dwSize, TRUE) == ERROR_INSUFFICIENT_BUFFER) { GlobalFree(pUdpTable); pUdpTable = (MIB_UDPTABLE *)GlobalAlloc(GMEM_SHARE, (UINT)dwSize); } // Make a second call to GetUdpTable to get // the actual data we require dwRetVal = GetUdpTable(pUdpTable, &dwSize, TRUE); if(dwRetVal == NO_ERROR) { for(int i = 0; i < (int)pUdpTable->dwNumEntries; i++) { dwLocalPort = pUdpTable->table[i].dwLocalPort / 256 + (pUdpTable->table[i].dwLocalPort % 256) * 256; dwLocalAddr = pUdpTable->table[i].dwLocalAddr; TListItem *pItem = lv->Items->Add(); pItem->Caption = String(lv->Items->Count); pItem->SubItems->Add("UDP"); pItem->SubItems->Add(GetHost(dwLocalAddr) + ":" + String(dwLocalPort)); pItem->SubItems->Add("*.*.*.*:*"); pItem->SubItems->Add(strTcpState[pTcpTable->table[i].dwState]); pItem->ImageIndex = 2; pItem->SubItems->Add("本地端口:" + GetPort(dwLocalPort, "UDP")); } } else { MessageBox(Application->Handle, SysErrorMessage(GetLastError()).c_str() , Application->Title.c_str(), MB_OK | MB_ICONERROR); }}//---------------------------------------// 删除链接bool __fastcall MyDeleteConnection(int nIndex){ pTcpTable->table[nIndex].dwState = MIB_TCP_STATE_DELETE_TCB; DWORD dwResult = SetTcpEntry(&pTcpTable->table[nIndex]); if(dwResult == NO_ERROR) { MessageBox(Application->Handle, "删除连接成功!", Application->Title.c_str(), MB_OK | MB_ICONINFORMATION); return true; } else { MessageBox(Application->Handle, "删除连接失败,该状态的连接不可删除!", Application->Title.c_str(), MB_OK | MB_ICONERROR); return false; }}
[解决办法]
与目标机器的端口尝试连接即可。如果连接失败，则认为是该端口处于关闭状态。
[解决办法]
扫描端口的方法可多了，针对TCP和UDP端口的方式也有不同之处，针对Windows和UNIX操作系统的端口扫描技术也有不同。