lokinet/win32-setup/regdb_helper.c
2019-02-26 15:48:03 -06:00

113 lines
3.4 KiB
C

/*
* Copyright (c)2018-2019 Rick V. All rights reserved.
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*------------------------------------------------------------------------------
* Shared object loaded by lokinet installer to properly detect the presence
* of the TAP v9 adapter
* -rick
*/
#include <sys/types.h>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* Windows registry crap */
#define MAX_KEY_LENGTH 255
#define MAX_VALUE_NAME 16383
#define ETHER_ADDR_LEN 6
/* checks if TAP-Win32 v9 is already installed */
BOOL
reg_query_helper()
{
HKEY adapters, adapter;
DWORD i, ret, len;
char *deviceid = NULL;
DWORD sub_keys = 0;
BOOL found = FALSE;
ret = RegOpenKeyEx(HKEY_LOCAL_MACHINE,
TEXT("SYSTEM\\CurrentControlSet\\Control\\Class\\{"
"4D36E972-E325-11CE-BFC1-08002BE10318}"),
0, KEY_READ, &adapters);
if(ret != ERROR_SUCCESS)
return FALSE;
ret = RegQueryInfoKey(adapters, NULL, NULL, NULL, &sub_keys, NULL, NULL, NULL,
NULL, NULL, NULL, NULL);
if(ret != ERROR_SUCCESS)
return FALSE;
if(sub_keys <= 0)
return FALSE;
/* Walk througt all adapters */
for(i = 0; i < sub_keys; i++)
{
char new_key[MAX_KEY_LENGTH];
char data[256];
TCHAR key[MAX_KEY_LENGTH];
DWORD keylen = MAX_KEY_LENGTH;
/* Get the adapter key name */
ret = RegEnumKeyEx(adapters, i, key, &keylen, NULL, NULL, NULL, NULL);
if(ret != ERROR_SUCCESS)
continue;
/* Append it to NETWORK_ADAPTERS and open it */
snprintf(new_key, sizeof new_key, "%s\\%s",
"SYSTEM\\CurrentControlSet\\Control\\Class\\{4D36E972-E325-11CE-"
"BFC1-08002BE10318}",
key);
ret =
RegOpenKeyEx(HKEY_LOCAL_MACHINE, TEXT(new_key), 0, KEY_READ, &adapter);
if(ret != ERROR_SUCCESS)
continue;
/* Check its values */
len = sizeof data;
ret =
RegQueryValueEx(adapter, "ComponentId", NULL, NULL, (LPBYTE)data, &len);
if(ret != ERROR_SUCCESS)
{
/* This value doesn't exist in this adaptater tree */
goto clean;
}
/* If its a tap adapter, its all good */
/* We only support TAP 9.x, TAP 8.x users must upgrade. */
if(strncmp(data, "tap0901", 7) == 0)
{
DWORD type;
len = sizeof data;
ret = RegQueryValueEx(adapter, "NetCfgInstanceId", NULL, &type,
(LPBYTE)data, &len);
if(ret != ERROR_SUCCESS)
goto clean;
found = TRUE;
break;
}
clean:
RegCloseKey(adapter);
}
RegCloseKey(adapters);
return found;
}