查找应用程序使用的tcp端口

Question

好吧,所以我扩展了我公司的flexlm供应商守护程序,以便对客户端应用程序有所了解.

我需要能够在客户端连接之前找出lmgrd正在侦听的端口.API文档似乎相当贫瘠,我相信他们将大部分代码保存在编译形式中,所以我不能只看它们的来源.

是否有可能调用Windows API的强大功能来找出特定进程正在使用的端口？如果来自sysinternals的Process Explorer可以做到,我应该能够做对吗？有没有人有这样的示例代码？

它需要支持Windows XP及更高版本,因为我们的许多客户尚未升级.

编辑:我应该注意到,事实证明FLEX支持从许可证文件中提取端口.我没有在我面前的代码,但知道这不是找出供应商守护程序/ lmgrd正在运行的端口的最佳方法.

Answer 1

GetTcpTable2 - 请参阅编辑

http://msdn.microsoft.com/en-us/library/bb408406(v=vs.85).aspx

GetTcpTable函数检索IPv4 TCP连接表.

这将填充MIB_TCPTABLE结构.

typedef struct _MIB_TCPTABLE {
  DWORD      dwNumEntries;
  MIB_TCPROW table[ANY_SIZE];
} MIB_TCPTABLE, *PMIB_TCPTABLE;

现在是MIB_TCPROW

typedef struct _MIB_TCPROW {
  DWORD dwState;
  DWORD dwLocalAddr;
  DWORD dwLocalPort;
  DWORD dwRemoteAddr;
  DWORD dwRemotePort;
} MIB_TCPROW, *PMIB_TCPROW;

编辑重要说明:

您需要使用GetTcpTable2以获得相关的PID关联.

typedef struct _MIB_TCPROW2 {
  DWORD                        dwState;
  DWORD                        dwLocalAddr;
  DWORD                        dwLocalPort;
  DWORD                        dwRemoteAddr;
  DWORD                        dwRemotePort;
  DWORD                        dwOwningPid;
  TCP_CONNECTION_OFFLOAD_STATE dwOffloadState;
} MIB_TCPROW2, *PMIB_TCPROW2;

dwOwningPid

Answer 2

这是我最终得到的代码，对于在我之后遇到这个问题的任何人

#include "stdafx.h"
#include <windows.h>
#include <iphlpapi.h>

// These are just for the ntohl function in the printf below
#include <winsock.h>
#pragma comment(lib, "Ws2_32.lib")

DWORD (WINAPI *pGetExtendedTcpTable)(
  PVOID pTcpTable,
  PDWORD pdwSize,
  BOOL bOrder,
  ULONG ulAf,
  TCP_TABLE_CLASS TableClass,
  ULONG Reserved
);

int _tmain(int argc, _TCHAR* argv[])
{
    MIB_TCPTABLE_OWNER_PID *pTCPInfo;
    MIB_TCPROW_OWNER_PID *owner;
    DWORD size;
    DWORD dwResult;

    HMODULE hLib = LoadLibrary("iphlpapi.dll");

    pGetExtendedTcpTable = (DWORD (WINAPI *)(PVOID, PDWORD, BOOL, ULONG, TCP_TABLE_CLASS, ULONG))
        GetProcAddress(hLib, "GetExtendedTcpTable");

    if (!pGetExtendedTcpTable)
    {
        printf("Could not load iphlpapi.dll. This application is for Windows XP SP2 and up.\n");
        return 1;
    }

    dwResult = pGetExtendedTcpTable(NULL,     &size, false, AF_INET, TCP_TABLE_OWNER_PID_LISTENER, 0);
    pTCPInfo = (MIB_TCPTABLE_OWNER_PID*)malloc(size);
    dwResult = pGetExtendedTcpTable(pTCPInfo, &size, false, AF_INET, TCP_TABLE_OWNER_PID_LISTENER, 0);

    if (dwResult != NO_ERROR)
    {
        printf("Couldn't get our IP table");
        return 2;
    }

    printf("Iterating though table:\n");
    for (DWORD dwLoop = 0; dwLoop < pTCPInfo->dwNumEntries; dwLoop++)
    {
        owner = &pTCPInfo->table[dwLoop];

        printf("  PID: %5u - Port: %5u\n", owner->dwOwningPid, ntohs(owner->dwLocalPort));
    }

    // Pause a moment
    printf("Done Processing\n");

    return 0;
}