我正在尝试检测2个网络适配器的DNS更改
我在win7 64位机器上使用c#.net 4.0
用于侦听网络适配器的win注册表项的代码（RegisterToDNSChanges内部）：
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.Net.NetworkInformation;
using System.Management;
using System.Threading;
namespace CheckDNS
{
class NetworkAdapterInfo
{
private Dictionary<NetworkInterface, IPAddress> m_dDNSinfo = new Dictionary<NetworkInterface, IPAddress>();
private ManagementEventWatcher m_watcher = null;
private NetworkAdapterInfo()
{
getDNSAddresses();
displayDNSInfo();
}
private static NetworkAdapterInfo _instance;
/*
* Instance creator (geter)
* */
public static NetworkAdapterInfo Instance
{
get
{
if (_instance == null)
{
_instance = new NetworkAdapterInfo();
}
return _instance;
}
}
/*
* Gets all DNS addresses for all Network cards
* Optionally changes all DNS addresses to a specified one
* */
private void getDNSAddresses()
{
NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
IPAddressCollection dnsServers = adapterProperties.DnsAddresses;
if (dnsServers.Count > 0)
{
foreach (IPAddress dns in dnsServers)
{
if (IsIPv4(dns.ToString()))
{
m_dDNSinfo.Add(adapter, dns);
}
}
}
}
}
/*
* Displays the Network adapter DNS servers
* */
public void displayDNSInfo()
{
foreach (KeyValuePair<NetworkInterface, IPAddress> pair in m_dDNSinfo)
{
Console.WriteLine("Adapter: {0}n DNS Server : {1}", pair.Key.Description, pair.Value.ToString());
}
}
/*
* Check to see if the ip is a valid one
* param value[in]: ip string
* @return true if it's a valid ip address
* */
public bool IsIPv4(string value)
{
var quads = value.Split('.');
// if we do not have 4 quads, return false
if (!(quads.Length == 4)) return false;
// for each quad
foreach (var quad in quads)
{
int q;
// if parse fails
// or length of parsed int != length of quad string (i.e.; '1' vs '001')
// or parsed int < 0
// or parsed int > 255
// return false
if (!Int32.TryParse(quad, out q)
|| !q.ToString().Length.Equals(quad.Length)
|| q < 0
|| q > 255) { return false; }
}
return true;
}
/*
* Used to verify if new DNS addresses found besides the ones already stored
* Optionally changes the DNS addreses
* */
private void checkIFDNSChanged()
{
NetworkInterface[] adapters = NetworkInterface.GetAllNetworkInterfaces();
foreach (NetworkInterface adapter in adapters)
{
IPInterfaceProperties adapterProperties = adapter.GetIPProperties();
IPAddressCollection dnsServers = adapterProperties.DnsAddresses;
if (dnsServers.Count > 0)
{
foreach (IPAddress dns in dnsServers)
{
if (IsIPv4(dns.ToString()))
{
bool dnsFound = false;
foreach (KeyValuePair<NetworkInterface, IPAddress> pair in m_dDNSinfo)
{
if (pair.Value.ToString() == dns.ToString())
{
dnsFound = true;
break;
}
}
if (dnsFound == false)
{
//DNS address changed
m_dDNSinfo.Add(adapter, dns);;
Console.WriteLine("Adapter: {0}n new DNS Server : {1}",
adapter.Description, dns.ToString());
}
}
}
}
}
}
public void RegisterToDNSChanges()
{
try
{
string path = null;
int count = 0;
path += "(";
foreach (KeyValuePair<NetworkInterface, IPAddress> pair in m_dDNSinfo)
{
if (0 == count++)
{
path += "(KeyPath = 'SYSTEM\\CurrentControlSet\\services\\Tcpip\\Parameters\\Interfaces\\" + pair.Key.Id + "'" + " AND ValueName='NameServer')";
continue;
}
path += " OR (KeyPath = 'SYSTEM\\CurrentControlSet\\services\\Tcpip\\Parameters\\Interfaces\\" + pair.Key.Id + "'" + " AND ValueName='NameServer')";
}
path += ")";
//@"AND KeyPath = 'SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{3E6EC2F0-C690-4CDA-BA57-5710EF53BEEC}' AND ValueName='NameServer'");
WqlEventQuery query = new WqlEventQuery(
"SELECT * FROM RegistryValueChangeEvent WHERE " +
"Hive = 'HKEY_LOCAL_MACHINE'" +
" AND " +
@path);
m_watcher = new ManagementEventWatcher(query);
//Console.WriteLine("Waiting for an event...");
// Set up the delegate that will handle the change event.
m_watcher.EventArrived += new EventArrivedEventHandler(HandleEvent);
// Start listening for events.
m_watcher.Start();
}
catch (ManagementException managementException)
{
Console.WriteLine("An error occurred: " + managementException.Message);
}
}
private void HandleEvent(object sender, EventArrivedEventArgs e)
{
//Console.WriteLine("Received an event.");
checkIFDNSChanged();
}
}
}
此代码正确提取网络适配器，并希望通过使用查询多个网络适配器ID的ManagementEventWatcher来侦听每个网络适配器的DNS更改。对于1个网络适配器，它可以完美地工作，但当有2个时，我会在捕获机制中得到错误"An error occured:Not found"。
被拒绝的查询如下所示：
select * from RegistryValueChangeEvent where Hive = 'HKEY_LOCAL_MACHINE' AND ((KeyPath = 'SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{3E6EC2F0-C690-4CDA-BA57-5710EF53BEEC}' AND ValueName='NameServer') OR (KeyPath = 'SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{D92D94EF-A89E-4D73-B024-C0BD9E41FF75}' AND ValueName='NameServer'))
仅成功查询1个网络适配器如下所示：
select * from RegistryValueChangeEvent where Hive = 'HKEY_LOCAL_MACHINE' AND ((KeyPath = 'SYSTEM\CurrentControlSet\services\Tcpip\Parameters\Interfaces\{3E6EC2F0-C690-4CDA-BA57-5710EF53BEEC}' AND ValueName='NameServer'))
你知道为什么ManagementEventWatcher拒绝对2个不同网络适配器的查询吗？感谢
这里非常奇怪的事实是，问题出在获取网络适配器上
函数getDNSAddresses查找2个似乎有效的适配器，它们设置了DNS服务器。我用这两个来存储和创建Wql查询，但其中一个无效，在regeditor中不是有效的网络适配器。
我在笔记本电脑上做了一张地图：
//Existing in regeditor
Qualcomm Atheros AR8171/8175 PCI-E Gigabit Ethernet Controller (NDIS 6.20)ID: {8B9CD735-49EE-49E1-8E0F-466C02D9BB85}
Microsoft Virtual WiFi Miniport Adapter #2ID: {90968357-571E-4653-B8CD-BDF1C549BC27}
Microsoft Virtual WiFi Miniport AdapterID: {456DFC38-8F54-4AC1-BF34-C85A05A80EEA}
Intel(R) Centrino(R) Wireless-N 2230ID: {18EBEB58-873F-4801-9832-C5BF63428D92}
Bluetooth Device (Personal Area Network)ID: {54557685-9600-4DE2-B0E9-2AEB8E1DCA9B}
VMware Virtual Ethernet Adapter for VMnet1ID: {6E4C4BD2-4391-45CB-BE37-880D144EAD4A}
VMware Virtual Ethernet Adapter for VMnet8ID: {84A07569-65AA-4055-8B09-5566D0CC4972}
//NOT present in regeditor
Software Loopback Interface 1ID: {3D3783A2-703A-11DE-8C7A-806E6F6E6963}
Microsoft ISATAP Adapter #2ID: {1E3038C6-32BA-4365-B4E4-9D8953F7AA5F}
Teredo Tunneling Pseudo-InterfaceID: {6FEF71DB-470C-4F86-A358-010DB22B378E}
Microsoft ISATAP Adapter #4ID: {0032E5D4-E471-4F9B-96E1-02899AEDEFF3}
Microsoft ISATAP Adapter #7ID: {94ABD1CA-912B-4AE9-A447-DE58556162B6}
Microsoft ISATAP Adapter #6ID: {FF2CB46B-7F79-475D-84BA-D0EF92FF2A79}
Microsoft ISATAP Adapter #9ID: {A436A38A-86D2-4578-B68B-6DA6F6730D96}
//Adapters find as VALID ones as containing DNS servers
Adapter: Intel(R) Centrino(R) Wireless-N 2230
Adapter ID:{18EBEB58-873F-4801-9832-C5BF63428D92}//this one is a VALID one with DNS server
DNS Server : 192.168.1.1
Adapter: Microsoft ISATAP Adapter #6
Adapter ID:{FF2CB46B-7F79-475D-84BA-D0EF92FF2A79}//this one is not found in regeditor
DNS Server : 192.168.1.1