mirror of
https://github.com/zerotier/ZeroTierOne.git
synced 2024-12-26 16:11:07 +00:00
353 lines
9.4 KiB
C++
353 lines
9.4 KiB
C++
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#include "WinDNSHelper.hpp"
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#include <comdef.h>
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#include <WbemIdl.h>
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#include <vector>
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#include <string>
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#include <sstream>
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#include <strsafe.h>
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#define MAX_KEY_LENGTH 255
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#define MAX_VALUE_NAME 16383
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namespace ZeroTier
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{
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BOOL RegDelnodeRecurse(HKEY hKeyRoot, LPTSTR lpSubKey)
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{
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LPTSTR lpEnd;
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LONG lResult;
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DWORD dwSize;
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TCHAR szName[MAX_PATH];
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HKEY hKey;
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FILETIME ftWrite;
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// First, see if we can delete the key without having
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// to recurse.
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lResult = RegDeleteKey(hKeyRoot, lpSubKey);
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if (lResult == ERROR_SUCCESS)
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return TRUE;
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lResult = RegOpenKeyEx(hKeyRoot, lpSubKey, 0, KEY_READ, &hKey);
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if (lResult != ERROR_SUCCESS)
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{
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if (lResult == ERROR_FILE_NOT_FOUND) {
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return TRUE;
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}
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else {
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return FALSE;
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}
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}
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// Check for an ending slash and add one if it is missing.
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lpEnd = lpSubKey + lstrlen(lpSubKey);
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if (*(lpEnd - 1) != TEXT('\\'))
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{
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*lpEnd = TEXT('\\');
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lpEnd++;
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*lpEnd = TEXT('\0');
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}
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// Enumerate the keys
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dwSize = MAX_PATH;
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lResult = RegEnumKeyEx(hKey, 0, szName, &dwSize, NULL,
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NULL, NULL, &ftWrite);
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if (lResult == ERROR_SUCCESS)
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{
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do {
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*lpEnd = TEXT('\0');
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StringCchCat(lpSubKey, MAX_PATH * 2, szName);
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if (!RegDelnodeRecurse(hKeyRoot, lpSubKey)) {
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break;
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}
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dwSize = MAX_PATH;
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lResult = RegEnumKeyEx(hKey, 0, szName, &dwSize, NULL,
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NULL, NULL, &ftWrite);
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} while (lResult == ERROR_SUCCESS);
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}
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lpEnd--;
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*lpEnd = TEXT('\0');
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RegCloseKey(hKey);
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// Try again to delete the key.
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lResult = RegDeleteKey(hKeyRoot, lpSubKey);
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if (lResult == ERROR_SUCCESS)
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return TRUE;
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return FALSE;
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}
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//*************************************************************
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//
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// RegDelnode()
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//
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// Purpose: Deletes a registry key and all its subkeys / values.
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//
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// Parameters: hKeyRoot - Root key
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// lpSubKey - SubKey to delete
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//
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// Return: TRUE if successful.
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// FALSE if an error occurs.
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//
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//*************************************************************
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BOOL RegDelnode(HKEY hKeyRoot, LPCTSTR lpSubKey)
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{
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TCHAR szDelKey[MAX_PATH * 2];
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StringCchCopy(szDelKey, MAX_PATH * 2, lpSubKey);
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return RegDelnodeRecurse(hKeyRoot, szDelKey);
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}
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std::vector<std::string> getSubKeys(const char* key)
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{
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std::vector<std::string> subkeys;
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HKEY hKey;
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,
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key,
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0,
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KEY_READ,
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&hKey) == ERROR_SUCCESS) {
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TCHAR achKey[MAX_KEY_LENGTH]; // buffer for subkey name
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DWORD cbName; // size of name string
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TCHAR achClass[MAX_PATH] = TEXT(""); // buffer for class name
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DWORD cchClassName = MAX_PATH; // size of class string
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DWORD cSubKeys = 0; // number of subkeys
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DWORD cbMaxSubKey; // longest subkey size
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DWORD cchMaxClass; // longest class string
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DWORD cValues; // number of values for key
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DWORD cchMaxValue; // longest value name
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DWORD cbMaxValueData; // longest value data
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DWORD cbSecurityDescriptor; // size of security descriptor
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FILETIME ftLastWriteTime; // last write time
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DWORD i, retCode;
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TCHAR achValue[MAX_VALUE_NAME];
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DWORD cchValue = MAX_VALUE_NAME;
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retCode = RegQueryInfoKey(
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hKey, // key handle
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achClass, // buffer for class name
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&cchClassName, // size of class string
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NULL, // reserved
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&cSubKeys, // number of subkeys
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&cbMaxSubKey, // longest subkey size
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&cchMaxClass, // longest class string
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&cValues, // number of values for this key
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&cchMaxValue, // longest value name
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&cbMaxValueData, // longest value data
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&cbSecurityDescriptor, // security descriptor
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&ftLastWriteTime); // last write time
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for (i = 0; i < cSubKeys; ++i) {
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cbName = MAX_KEY_LENGTH;
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retCode = RegEnumKeyEx(
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hKey,
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i,
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achKey,
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&cbName,
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NULL,
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NULL,
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NULL,
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&ftLastWriteTime);
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if (retCode == ERROR_SUCCESS) {
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subkeys.push_back(achKey);
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}
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}
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}
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RegCloseKey(hKey);
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return subkeys;
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}
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std::vector<std::string> getValueList(const char* key) {
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std::vector<std::string> values;
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HKEY hKey;
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,
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key,
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0,
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KEY_READ,
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&hKey) == ERROR_SUCCESS) {
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TCHAR achKey[MAX_KEY_LENGTH]; // buffer for subkey name
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DWORD cbName; // size of name string
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TCHAR achClass[MAX_PATH] = TEXT(""); // buffer for class name
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DWORD cchClassName = MAX_PATH; // size of class string
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DWORD cSubKeys = 0; // number of subkeys
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DWORD cbMaxSubKey; // longest subkey size
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DWORD cchMaxClass; // longest class string
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DWORD cValues; // number of values for key
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DWORD cchMaxValue; // longest value name
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DWORD cbMaxValueData; // longest value data
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DWORD cbSecurityDescriptor; // size of security descriptor
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FILETIME ftLastWriteTime; // last write time
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DWORD i, retCode;
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TCHAR achValue[MAX_VALUE_NAME];
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DWORD cchValue = MAX_VALUE_NAME;
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retCode = RegQueryInfoKey(
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hKey, // key handle
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achClass, // buffer for class name
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&cchClassName, // size of class string
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NULL, // reserved
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&cSubKeys, // number of subkeys
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&cbMaxSubKey, // longest subkey size
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&cchMaxClass, // longest class string
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&cValues, // number of values for this key
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&cchMaxValue, // longest value name
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&cbMaxValueData, // longest value data
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&cbSecurityDescriptor, // security descriptor
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&ftLastWriteTime); // last write time
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for (i = 0, retCode = ERROR_SUCCESS; i < cValues; ++i) {
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cchValue = MAX_VALUE_NAME;
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achValue[0] = '\0';
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retCode = RegEnumValue(
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hKey,
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i,
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achValue,
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&cchValue,
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NULL,
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NULL,
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NULL,
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NULL);
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if (retCode == ERROR_SUCCESS) {
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values.push_back(achValue);
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}
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}
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}
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RegCloseKey(hKey);
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return values;
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}
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std::pair<bool, std::string> WinDNSHelper::hasDNSConfig(uint64_t nwid)
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{
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char networkStr[20] = { 0 };
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sprintf(networkStr, "%.16llx", nwid);
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const char* baseKey = "SYSTEM\\CurrentControlSet\\Services\\Dnscache\\Parameters\\DnsPolicyConfig";
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auto subkeys = getSubKeys(baseKey);
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for (auto it = subkeys.begin(); it != subkeys.end(); ++it) {
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char sub[MAX_KEY_LENGTH] = { 0 };
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sprintf(sub, "%s\\%s", baseKey, it->c_str());
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auto dnsRecords = getValueList(sub);
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for (auto it2 = dnsRecords.begin(); it2 != dnsRecords.end(); ++it2) {
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if ((*it2) == "Comment") {
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HKEY hKey;
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE,
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sub,
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0,
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KEY_READ,
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&hKey) == ERROR_SUCCESS) {
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char buf[16384] = { 0 };
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DWORD size = sizeof(buf);
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DWORD retCode = RegGetValueA(
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HKEY_LOCAL_MACHINE,
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sub,
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it2->c_str(),
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RRF_RT_REG_SZ,
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NULL,
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&buf,
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&size);
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if (retCode == ERROR_SUCCESS) {
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if (std::string(networkStr) == std::string(buf)) {
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RegCloseKey(hKey);
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return std::make_pair(true, std::string(sub));
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}
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}
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else {
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}
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}
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RegCloseKey(hKey);
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}
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}
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}
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return std::make_pair(false, std::string());
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}
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void WinDNSHelper::setDNS(uint64_t nwid, const char* domain, const std::vector<InetAddress>& servers)
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{
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auto hasConfig = hasDNSConfig(nwid);
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std::stringstream ss;
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for (auto it = servers.begin(); it != servers.end(); ++it) {
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char ipaddr[256] = { 0 };
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ss << it->toIpString(ipaddr);
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if ((it + 1) != servers.end()) {
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ss << ";";
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}
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}
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std::string serverValue = ss.str();
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if (hasConfig.first) {
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// update existing config
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HKEY dnsKey;
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, hasConfig.second.c_str(), 0, KEY_READ | KEY_WRITE, &dnsKey) == ERROR_SUCCESS) {
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auto retCode = RegSetKeyValueA(dnsKey, NULL, "GenericDNSServers", REG_SZ, serverValue.data(), (DWORD)serverValue.length());
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if (retCode != ERROR_SUCCESS) {
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fprintf(stderr, "Error writing dns servers: %d\n", retCode);
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}
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}
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} else {
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// add new config
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const char* baseKey = "SYSTEM\\CurrentControlSet\\Services\\Dnscache\\Parameters\\DnsPolicyConfig";
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GUID guid;
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CoCreateGuid(&guid);
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wchar_t guidTmp[128] = { 0 };
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char guidStr[128] = { 0 };
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StringFromGUID2(guid, guidTmp, 128);
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wcstombs(guidStr, guidTmp, 128);
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char fullKey[MAX_KEY_LENGTH] = { 0 };
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sprintf(fullKey, "%s\\%s", baseKey, guidStr);
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HKEY dnsKey;
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RegCreateKeyA(HKEY_LOCAL_MACHINE, fullKey, &dnsKey);
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if (RegOpenKeyExA(HKEY_LOCAL_MACHINE, fullKey, 0, KEY_READ | KEY_WRITE, &dnsKey) == ERROR_SUCCESS) {
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char nwString[32] = { 0 };
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sprintf(nwString, "%.16llx", nwid);
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RegSetKeyValueA(dnsKey, NULL, "Comment", REG_SZ, nwString, strlen(nwString));
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DWORD configOpts = 8;
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RegSetKeyValueA(dnsKey, NULL, "ConfigOptions", REG_DWORD, &configOpts, sizeof(DWORD));
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RegSetKeyValueA(dnsKey, NULL, "DisplayName", REG_SZ, "", 0);
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RegSetKeyValueA(dnsKey, NULL, "GenericDNSServers", REG_SZ, serverValue.data(), serverValue.length());
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RegSetKeyValueA(dnsKey, NULL, "IPSECCARestriction", REG_SZ, "", 0);
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std::string d = "." + std::string(domain);
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RegSetKeyValueA(dnsKey, NULL, "Name", REG_MULTI_SZ, d.data(), d.length());
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DWORD version = 2;
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RegSetKeyValueA(dnsKey, NULL, "Version", REG_DWORD, &version, sizeof(DWORD));
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}
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}
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}
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void WinDNSHelper::removeDNS(uint64_t nwid)
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{
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auto hasConfig = hasDNSConfig(nwid);
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if (hasConfig.first) {
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RegDelnode(HKEY_LOCAL_MACHINE, hasConfig.second.c_str());
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}
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}
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}
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