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/*
*
* Copyright 2018 gRPC authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
#include <grpc/support/port_platform.h>
#ifdef GPR_WINDOWS
#include "src/core/lib/security/credentials/alts/check_gcp_environment.h"
#include <shellapi.h>
#include <stdio.h>
#include <tchar.h>
#include <windows.h>
#include <grpc/support/alloc.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#define GRPC_ALTS_EXPECT_NAME_GOOGLE "Google"
#define GRPC_ALTS_WINDOWS_CHECK_COMMAND "powershell.exe"
#define GRPC_ALTS_WINDOWS_CHECK_COMMAND_ARGS \
"(Get-WmiObject -Class Win32_BIOS).Manufacturer"
#define GRPC_ALTS_WINDOWS_CHECK_BIOS_FILE "windows_bios.data"
const size_t kBiosDataBufferSize = 256;
static bool g_compute_engine_detection_done = false;
static bool g_is_on_compute_engine = false;
static gpr_mu g_mu;
static gpr_once g_once = GPR_ONCE_INIT;
namespace grpc_core {
namespace internal {
bool check_bios_data(const char* bios_data_file) {
char* bios_data = read_bios_file(bios_data_file);
bool result = !strcmp(bios_data, GRPC_ALTS_EXPECT_NAME_GOOGLE);
remove(GRPC_ALTS_WINDOWS_CHECK_BIOS_FILE);
gpr_free(bios_data);
return result;
}
} // namespace internal
} // namespace grpc_core
static void init_mu(void) { gpr_mu_init(&g_mu); }
static bool run_powershell() {
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(sa);
sa.lpSecurityDescriptor = NULL;
sa.bInheritHandle = TRUE;
HANDLE h = CreateFile(_T(GRPC_ALTS_WINDOWS_CHECK_BIOS_FILE), GENERIC_WRITE,
FILE_SHARE_WRITE | FILE_SHARE_READ, &sa, OPEN_ALWAYS,
FILE_ATTRIBUTE_NORMAL, NULL);
if (h == INVALID_HANDLE_VALUE) {
gpr_log(GPR_ERROR, "CreateFile failed (%d).", GetLastError());
return false;
}
PROCESS_INFORMATION pi;
STARTUPINFO si;
DWORD flags = CREATE_NO_WINDOW;
ZeroMemory(&pi, sizeof(pi));
ZeroMemory(&si, sizeof(si));
si.cb = sizeof(si);
si.dwFlags |= STARTF_USESTDHANDLES;
si.hStdInput = NULL;
si.hStdError = h;
si.hStdOutput = h;
TCHAR cmd[kBiosDataBufferSize];
_sntprintf(cmd, kBiosDataBufferSize, _T("%s %s"),
_T(GRPC_ALTS_WINDOWS_CHECK_COMMAND),
_T(GRPC_ALTS_WINDOWS_CHECK_COMMAND_ARGS));
if (!CreateProcess(NULL, cmd, NULL, NULL, TRUE, flags, NULL, NULL, &si,
&pi)) {
gpr_log(GPR_ERROR, "CreateProcess failed (%d).\n", GetLastError());
return false;
}
WaitForSingleObject(pi.hProcess, INFINITE);
CloseHandle(pi.hProcess);
CloseHandle(pi.hThread);
CloseHandle(h);
return true;
}
bool grpc_alts_is_running_on_gcp() {
gpr_once_init(&g_once, init_mu);
gpr_mu_lock(&g_mu);
if (!g_compute_engine_detection_done) {
g_is_on_compute_engine =
run_powershell() &&
grpc_core::internal::check_bios_data(GRPC_ALTS_WINDOWS_CHECK_BIOS_FILE);
g_compute_engine_detection_done = true;
}
gpr_mu_unlock(&g_mu);
return g_is_on_compute_engine;
}
#endif // GPR_WINDOWS
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