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ven
Moderator
Joined: 10 Dec 2004
Posts: 2064
Location: USA
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 Posted: 23.01.05 07:05 Post subject: CHMAC: Change MAC address in Windows |
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I think the "C/C++, Assembler" section has been empty too long. So, as a remedy, I decided to post the source code to a little C++ program I wrote, called CHMAC, that anyone with Windows XP or later (it might work with 2000, but I haven't tested that) can use to change the MAC address of the network card. The compiled binary is available on my site.
| Code: | #include <iostream.h>
#include <stdio.h>
#include <windows.h>
#include <setupapi.h>
#include <devguid.h>
#include <regstr.h>
#include <stdlib.h>
#include "string.h"
unsigned long enableDisable = -1;
char* newAddr;
int main( int argc, char *argv[ ], char *envp[ ] )
{
if(argc > 2){
enableDisable = atoi(argv[1]);
newAddr = argv[2];
}
else{
cout << "CHMAC - Change MAC address. Also sounds cool when pronounced as one word.\r\nUSAGE: chmac adapter address\r\nwhere adapter is the desired adapter number from the list below,\r\nand address is a MAC address in the format dd11223344f8 or RESET to reset\r\nto the default value. NOTE: A MAC address can only contain hexadecimals\r\n(0123456789ABCDEF). There is NO automatic checking!\r\nDisclaimer: This program is provided \"AS-IS\". Anything that may or may not\r\nhappen because of it is entirely the user's fault.\r\n\r\n";
}
HDEVINFO hDevInfo;
SP_DEVINFO_DATA DeviceInfoData;
SP_PROPCHANGE_PARAMS Param;
DWORD i;
// Create a HDEVINFO with all present devices.
hDevInfo = SetupDiGetClassDevs(NULL,
0, // Enumerator
0,
DIGCF_PRESENT | DIGCF_ALLCLASSES );
if (hDevInfo == INVALID_HANDLE_VALUE)
{
return 1;
}
// Enumerate through all devices in Set.
DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
for (i=0;SetupDiEnumDeviceInfo(hDevInfo,i,
&DeviceInfoData);i++)
{
DWORD DataT;
LPTSTR buffer = NULL;
DWORD buffersize = 0;
unsigned long netguid = 1295444338;
while (!SetupDiGetDeviceRegistryProperty(
hDevInfo,
&DeviceInfoData,
SPDRP_DEVICEDESC,
&DataT,
(PBYTE)buffer,
buffersize,
&buffersize))
{
if (GetLastError() ==
ERROR_INSUFFICIENT_BUFFER)
{
if (buffer) LocalFree(buffer);
buffer = (LPTSTR)LocalAlloc(LPTR,buffersize);
}
else
{
break;
}
}
if(DeviceInfoData.ClassGuid.Data1 == netguid && enableDisable == -1) cout << i << ": " << buffer << endl;
if(i == enableDisable && DeviceInfoData.ClassGuid.Data1 == netguid){
HKEY k = SetupDiOpenDevRegKey(hDevInfo, &DeviceInfoData, DICS_FLAG_GLOBAL, 0, DIREG_DRV, KEY_ALL_ACCESS);
if(k == INVALID_HANDLE_VALUE){
cout << "ERROR: Cannot open driver information for editing!" << endl;
exit(1);
}
TCHAR regData[128];
unsigned long regDataLen = sizeof(regData);
if(RegQueryValueEx(k, "NetworkAddress", NULL, NULL, (unsigned char*)®Data, ®DataLen) == 0){
//something exists; KILL IT!!!
cout << "Previous value exists; deleting..." << endl;
RegDeleteValue(k, "NetworkAddress");
}
if(stricmp((const char*)newAddr, "reset") != 0){
if(RegSetValueEx(k, "NetworkAddress", 0, REG_SZ, (const unsigned char*)newAddr, strlen((const char*)newAddr)) != ERROR_SUCCESS){
cout << "ERROR: Could not set new MAC address!" << endl;
exit(1);
}
}
else{
cout << "MAC reset successful. Proceeding..." << endl;
}
cout << "Change successful. Rebooting adapter..." << endl;
RegCloseKey(k);
Param.ClassInstallHeader.cbSize = sizeof(Param.ClassInstallHeader);
Param.ClassInstallHeader.InstallFunction = DIF_PROPERTYCHANGE;
Param.HwProfile = 0;
Param.Scope = DICS_FLAG_GLOBAL;
//disable it:
Param.StateChange = DICS_DISABLE;
SetupDiSetClassInstallParams(hDevInfo, &DeviceInfoData, (SP_CLASSINSTALL_HEADER *)&Param, sizeof(Param));
SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, &DeviceInfoData);
//reenable it:
Param.StateChange = DICS_ENABLE;
SetupDiSetClassInstallParams(hDevInfo, &DeviceInfoData, (SP_CLASSINSTALL_HEADER *)&Param, sizeof(Param));
SetupDiCallClassInstaller(DIF_PROPERTYCHANGE, hDevInfo, &DeviceInfoData);
cout << "CHMAC complete." << endl;
}
if (buffer) LocalFree(buffer);
}
if ( GetLastError()!=NO_ERROR &&
GetLastError()!=ERROR_NO_MORE_ITEMS )
{
return 1;
}
SetupDiDestroyDeviceInfoList(hDevInfo);
return 0;
} |
I realize I probably have around three comments in the whole thing, but I never planned on doing anything with the code to require any comments. So if anyone dares to analyze that code and has a question, please ask. |
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dellanio
Funnilein
Joined: 05 Jun 2005
Posts: 1
Location: california
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| Posted: 05.06.05 16:20 Post subject: Cool but.... |
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But where is the compiled binary??? Your site doesnt have this.
Thanks! |
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dennisvanhouts
Guest
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| Posted: 05.06.05 17:18 Post subject: |
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Well, if I go to the link he provided, I can download the EXE file.  |
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ven
Moderator
Joined: 10 Dec 2004
Posts: 2064
Location: USA
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| Posted: 06.06.05 00:56 Post subject: |
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Exactly. I don't know how much more plain (text) it can be.
_________________
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animestash
Little-Fun
Joined: 19 Oct 2005
Posts: 22
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| Posted: 20.10.05 09:32 Post subject: |
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| I didn't know you can change MAC IP, isn't that hardcoded into the NIC's e2prom? |
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ven
Moderator
Joined: 10 Dec 2004
Posts: 2064
Location: USA
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| Posted: 20.10.05 17:47 Post subject: |
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It's not a "MAC IP," it's just a MAC address. An IP is something totally different. Yes, the MAC is hardcoded, but that can be bypassed using a special setting in Windows, which my program takes advantage of.
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