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Implement MAC address change in Windows

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Fixes #43
This commit is contained in:
emanuele-f 2019-06-30 22:31:31 +02:00
parent e1b2ab3eca
commit 53d27bebf5
2 changed files with 113 additions and 10 deletions
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122
win32/wintap.c
View File

@ -16,7 +16,7 @@ void initWin32() {
/* Tell the user that we could not find a usable */
/* WinSock DLL. */
printf("FATAL ERROR: unable to initialise Winsock 2.x.");
exit(-1);
exit(EXIT_FAILURE);
}
}
@ -28,12 +28,23 @@ struct win_adapter_info {
/* ***************************************************** */
static HANDLE open_tap_device(const char *adapterid) {
char tapname[1024];
_snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapterid);
return(CreateFile(tapname, GENERIC_WRITE | GENERIC_READ,
0, /* Don't let other processes share or open
the resource until the handle's been closed */
0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0));
}
/* ***************************************************** */
static void iterate_win_network_adapters(
int (*callback)(struct win_adapter_info*, struct tuntap_dev *),
void *userdata) {
HKEY key, key2;
char regpath[1024];
char tapname[1024];
long len, rc;
int found = 0;
int err, i;
@ -42,7 +53,7 @@ static void iterate_win_network_adapters(
/* Open registry and look for network adapters */
if((rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, NETWORK_CONNECTIONS_KEY, 0, KEY_READ, &key))) {
printf("Unable to read registry: [rc=%d]\n", rc);
exit(-1);
exit(EXIT_FAILURE);
/* MSVC Note: If you keep getting rc=2 errors, make sure you set:
Project -> Properties -> Configuration Properties -> General -> Character set
to: "Use Multi-Byte Character Set"
@ -68,11 +79,9 @@ static void iterate_win_network_adapters(
if(err)
continue;
_snprintf(tapname, sizeof(tapname), USERMODEDEVICEDIR "%s" TAPSUFFIX, adapter.adapterid);
adapter.handle = CreateFile(tapname, GENERIC_WRITE | GENERIC_READ,
0, /* Don't let other processes share or open
the resource until the handle's been closed */
0, OPEN_EXISTING, FILE_ATTRIBUTE_SYSTEM | FILE_FLAG_OVERLAPPED, 0);
adapter.handle = open_tap_device(adapter.adapterid);
if(adapter.handle != INVALID_HANDLE_VALUE) {
/* Valid device, use the callback */
if(!callback(&adapter, userdata))
@ -90,6 +99,9 @@ static void iterate_win_network_adapters(
static int print_adapter_callback(struct win_adapter_info *adapter, void *userdata) {
printf(" %s - %s\n", adapter->adapterid, adapter->adaptername);
/* continue */
return(1);
}
void win_print_available_adapters() {
@ -98,6 +110,93 @@ void win_print_available_adapters() {
/* ***************************************************** */
static int lookup_adapter_info_reg(const char *target_adapter, char *regpath, size_t regpath_size) {
HKEY key, key2;
long len, rc;
char index[16];
int err, i;
char adapter_name[N2N_IFNAMSIZ];
int rv = 0;
if((rc = RegOpenKeyEx(HKEY_LOCAL_MACHINE, ADAPTER_INFO_KEY, 0, KEY_READ, &key))) {
printf("Unable to read registry: %s, [rc=%d]\n", ADAPTER_INFO_KEY, rc);
exit(EXIT_FAILURE);
}
for(i = 0; ; i++) {
len = sizeof(index);
if(RegEnumKeyEx(key, i, (LPTSTR)index, &len, 0, 0, 0, NULL))
break;
_snprintf(regpath, regpath_size, "%s\\%s", ADAPTER_INFO_KEY, index);
if(RegOpenKeyEx(HKEY_LOCAL_MACHINE, (LPCSTR)regpath, 0, KEY_READ, &key2))
continue;
len = sizeof(adapter_name);
err = RegQueryValueEx(key2, "NetCfgInstanceId", 0, 0, adapter_name, &len);
RegCloseKey(key2);
if(err)
continue;
if(!strcmp(adapter_name, target_adapter)) {
rv = 1;
break;
}
}
RegCloseKey(key);
return(rv);
}
/* ***************************************************** */
static void set_interface_mac(struct tuntap_dev *device, const char *mac_str) {
char cmd[256];
char mac_buf[18];
char adapter_info_reg[1024];
uint64_t mac = 0;
uint8_t *ptr = (u_int8_t*)&mac;
if(strlen(mac_str) != 17) {
printf("Invalid MAC: %s\n", mac_str);
exit(EXIT_FAILURE);
}
/* Remove the colons */
for(int i=0; i<6; i++) {
mac_buf[i*2] = mac_str[2*i + i];
mac_buf[i*2+1] = mac_str[2*i + i + 1];
}
mac_buf[12] = '\0';
if(!lookup_adapter_info_reg(device->device_name, adapter_info_reg, sizeof(adapter_info_reg))) {
printf("Could not determine adapter MAC registry key\n");
exit(EXIT_FAILURE);
}
_snprintf(cmd, sizeof(cmd),
"reg add HKEY_LOCAL_MACHINE\\%s /v MAC /d %s /f > nul", adapter_info_reg, mac_buf);
system(cmd);
/* Put down then up again to apply */
CloseHandle(device->device_handle);
_snprintf(cmd, sizeof(cmd), "netsh interface set interface \"%s\" disabled > nul", device->ifName);
system(cmd);
_snprintf(cmd, sizeof(cmd), "netsh interface set interface \"%s\" enabled > nul", device->ifName);
system(cmd);
device->device_handle = open_tap_device(device->device_name);
if(device->device_handle == INVALID_HANDLE_VALUE) {
printf("Reopening TAP device \"%s\" failed\n", device->device_name);
exit(EXIT_FAILURE);
}
}
/* ***************************************************** */
static int choose_adapter_callback(struct win_adapter_info *adapter, void *userdata) {
struct tuntap_dev *device = (struct tuntap_dev *)userdata;
@ -139,15 +238,18 @@ int open_wintap(struct tuntap_dev *device,
iterate_win_network_adapters(choose_adapter_callback, device);
if(device->device_handle == INVALID_HANDLE_VALUE) {
if(!devname)
if(!devname[0])
printf("No Windows tap devices found, did you run tapinstall.exe?\n");
else
printf("Cannot find tap device \"%s\"\n", devname);
exit(0);
exit(EXIT_FAILURE);
}
/* ************************************** */
if(device_mac[0])
set_interface_mac(device, device_mac);
/* Get MAC address from tap device->device_name */
if(!DeviceIoControl(device->device_handle, TAP_IOCTL_GET_MAC,

1
win32/wintap.h
View File

@ -44,6 +44,7 @@
#define ADAPTER_KEY "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
#define NETWORK_CONNECTIONS_KEY "SYSTEM\\CurrentControlSet\\Control\\Network\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
#define ADAPTER_INFO_KEY "SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
//======================
// Filesystem prefixes