区分本地网卡是物理网卡还是虚拟网卡

た入场券 2022-08-24 01:30 445阅读 0赞

GetAdaptersInfo 可以获得本机所有网卡的信息，然而这些网卡中可能包括虚拟网卡。例如，若安装了 VMWare 或者某些 VPN 客户端软件，则会出现若干虚拟网卡。它们在形式上与物理网卡几乎没有区别。 ipconfig 将它们与本地物理网卡等同对待。  
  
有些人建议使用 MAC 地址中的 "locally administread bit" 来区分。而事实证明这是靠不住的。[http://hi.baidu.com/xzq2000/blog ... cd762f07088b95.html][http_hi.baidu.com_xzq2000_blog ... cd762f07088b95.html]  
是目前我找到的比较实用的办法。  
  
其原理是先由 GetAdaptersInfo 获取所有网卡的基本信息。然后利用网卡名去注册表中查找对应的硬件信息。若是物理网卡，其硬件信息中通常会包含 PCI 。  
  
例如，某个网卡的名为 \{ACA306D0-1D69-4116-BC2B-919B428AD084\}。  
他在注册表中的信息所在位置为：  
HKEY\_LOCAL\_MACHINE/SYSTEM/CurrentControlSet/Control/Network/\{4D36E972-E325-11CE-BFC1-08002BE10318\}/\{ACA306D0-1D69-4116-BC2B-919B428AD084\}/Connection  
  
若PnpInstanceID的值以PCI开头，说明是物理网卡，MediaSubType为01则是常见网卡，02为无线网卡。  
  
以下代码是从上述网页中转贴。该例中仅当网卡为有线物理网卡时才返回true.

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CODE:

bool IsLocalAdapter ( const char \*pAdapterName ) const  
...\{  
BOOL ret\_value = FALSE;  
  
\#define NET\_CARD\_KEY "System/CurrentControlSet/Control/Network/\{4D36E972-E325-11CE-BFC1-08002BE10318\}"  
char szDataBuf\[MAX\_PATH+1\];  
DWORD dwDataLen = MAX\_PATH;  
DWORD dwType = REG\_SZ;  
HKEY hNetKey = NULL;  
HKEY hLocalNet = NULL;  
  
if(ERROR\_SUCCESS != RegOpenKeyEx(HKEY\_LOCAL\_MACHINE, NET\_CARD\_KEY, 0, KEY\_READ, &hNetKey))  
return FALSE;  
sprintf(szDataBuf, "%s/Connection", pAdapterName);  
if(ERROR\_SUCCESS != RegOpenKeyEx(hNetKey ,szDataBuf ,0 ,KEY\_READ, &hLocalNet))  
...\{  
RegCloseKey(hNetKey);  
return FALSE;  
\}  
if (ERROR\_SUCCESS != RegQueryValueEx(hLocalNet, "MediaSubType", 0, &dwType, (BYTE \*)szDataBuf, &dwDataLen))  
...\{  
goto ret;  
\}  
if (\*((DWORD \*)szDataBuf)!=0x01)  
goto ret;  
dwDataLen = MAX\_PATH;  
if (ERROR\_SUCCESS != RegQueryValueEx(hLocalNet, ";PnpInstanceID", 0, &dwType, (BYTE \*)szDataBuf, &dwDataLen))  
...\{  
goto ret;  
\}  
if (strncmp(szDataBuf, ";PCI", strlen(";PCI")))  
goto ret;  
  
ret\_value = TRUE;  
  
ret:  
RegCloseKey(hLocalNet);  
RegCloseKey(hNetKey);  
  
return ret\_value!=0;  
  
\}

**获得正确本地MAC地址，区分虚拟网卡**

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CODE:

void GetLocalMAC(char \*buf)  
\{  
IP\_ADAPTER\_INFO \*IpAdaptersInfo =NULL;  
IP\_ADAPTER\_INFO \*IpAdaptersInfoHead =NULL;  
  
IpAdaptersInfo = (IP\_ADAPTER\_INFO \*) GlobalAlloc(GPTR, sizeof(IP\_ADAPTER\_INFO ));  
  
if (IpAdaptersInfo == NULL)  
\{  
return;  
\}  
  
DWORD dwDataSize = sizeof( IP\_ADAPTER\_INFO );  
DWORD dwRetVal = GetAdaptersInfo(IpAdaptersInfo,&dwDataSize);  
  
if ( ERROR\_SUCCESS != dwRetVal)  
\{  
GlobalFree( IpAdaptersInfo );  
IpAdaptersInfo = NULL;  
  
if( ERROR\_BUFFER\_OVERFLOW == dwRetVal)  
\{  
IpAdaptersInfo =(IP\_ADAPTER\_INFO \*) GlobalAlloc( GPTR, dwDataSize );  
if (IpAdaptersInfo == NULL)  
\{  
return;  
\}  
if ( ERROR\_SUCCESS != GetAdaptersInfo( IpAdaptersInfo, &dwDataSize ))  
\{  
GlobalFree( IpAdaptersInfo );  
return;  
\}  
  
\}  
else  
\{  
return;  
\}  
  
\}  
  
//Save the head pointer of IP\_ADAPTER\_INFO structures list.  
IpAdaptersInfoHead = IpAdaptersInfo;  
  
do\{  
if (IsLocalAdapter(IpAdaptersInfo->AdapterName))  
\{  
sprintf(buf,"%02x-%02x-%02x-%02x-%02x-%02x",  
IpAdaptersInfo->Address\[0\],  
IpAdaptersInfo->Address\[1\],  
IpAdaptersInfo->Address\[2\],  
IpAdaptersInfo->Address\[3\],  
IpAdaptersInfo->Address\[4\],  
IpAdaptersInfo->Address\[5\]);  
//  
break;  
\}  
  
IpAdaptersInfo = IpAdaptersInfo->Next;  
  
\}while (IpAdaptersInfo);  
  
if (IpAdaptersInfoHead != NULL)  
\{  
GlobalFree( IpAdaptersInfoHead );  
\}  
\}  
  
  
BOOL IsLocalAdapter(char \*pAdapterName)  
\{  
BOOL ret\_value = FALSE;  
  
\#define NET\_CARD\_KEY \_T("System//CurrentControlSet//Control//Network//\{4D36E972-E325-11CE-BFC1-08002BE10318\}")  
char szDataBuf\[MAX\_PATH+1\];  
DWORD dwDataLen = MAX\_PATH;  
DWORD dwType = REG\_SZ;  
HKEY hNetKey = NULL;  
HKEY hLocalNet = NULL;  
  
if(ERROR\_SUCCESS != RegOpenKeyEx(HKEY\_LOCAL\_MACHINE, NET\_CARD\_KEY, 0, KEY\_READ, &hNetKey))  
return FALSE;  
wsprintf(szDataBuf, "%s//Connection", pAdapterName);  
if(ERROR\_SUCCESS != RegOpenKeyEx(hNetKey ,szDataBuf ,0 ,KEY\_READ, &hLocalNet))  
\{  
RegCloseKey(hNetKey);  
return FALSE;  
\}  
if (ERROR\_SUCCESS != RegQueryValueEx(hLocalNet, "MediaSubType", 0, &dwType, (BYTE \*)szDataBuf, &dwDataLen))  
\{  
goto ret;  
\}  
if (\*((DWORD \*)szDataBuf)!=0x01)  
goto ret;  
dwDataLen = MAX\_PATH;  
if (ERROR\_SUCCESS != RegQueryValueEx(hLocalNet, ";PnpInstanceID", 0, &dwType, (BYTE \*)szDataBuf, &dwDataLen))  
\{  
goto ret;  
\}  
if (strncmp(szDataBuf, ";PCI", strlen(";PCI")))  
goto ret;  
  
ret\_value = TRUE;  
  
ret:  
RegCloseKey(hLocalNet);  
RegCloseKey(hNetKey);  
  
return ret\_value;  
\}

以前的那个无法区分虚拟网卡，所以在得到MAC地址时会出现大量重复的现象，非常麻烦，这个就没有问题了。  
  
HKEY\_LOCAL\_MACHINE/SYSTEM/CurrentControlSet/Control/Network/\{4D36E972-E325-11CE-BFC1-08002BE10318\}/\{ACA306D0-1D69-4116-BC2B-919B428AD084\}/Connection  
网卡在注册表里的位置  
  
区分PnpInstanceID，如果前面有PCI就是本机的真实网卡，MediaSubType为01则是常见网卡，02为无线网卡。

[http_hi.baidu.com_xzq2000_blog ... cd762f07088b95.html]: http://hi.baidu.com/xzq2000/blog/item/43b686d672cd762f07088b95.html
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