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//
//
// Copyright 2015 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.
//
//
// for secure_getenv.
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <grpc/support/port_platform.h>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include "y_absl/types/optional.h"
#ifdef GPR_LINUX_ENV
#if defined(GPR_BACKWARDS_COMPATIBILITY_MODE)
#include <dlfcn.h>
#endif
#include <features.h>
#include <stdlib.h>
#include "src/core/lib/gprpp/env.h"
namespace grpc_core {
y_absl::optional<TString> GetEnv(const char* name) {
char* result = nullptr;
#if defined(GPR_BACKWARDS_COMPATIBILITY_MODE)
typedef char* (*getenv_type)(const char*);
static getenv_type getenv_func = nullptr;
// Check to see which getenv variant is supported (go from most
// to least secure)
if (getenv_func == nullptr) {
for (auto name : {"secure_getenv", "__secure_getenv", "getenv"}) {
getenv_func = reinterpret_cast<getenv_type>(dlsym(RTLD_DEFAULT, name));
if (getenv_func != nullptr) {
break;
}
}
}
result = getenv_func(name);
#elif __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17)
result = secure_getenv(name);
#else
result = getenv(name);
#endif
if (result == nullptr) return y_absl::nullopt;
return result;
}
void SetEnv(const char* name, const char* value) {
int res = setenv(name, value, 1);
if (res != 0) abort();
}
void UnsetEnv(const char* name) {
int res = unsetenv(name);
if (res != 0) abort();
}
} // namespace grpc_core
#endif // GPR_LINUX_ENV
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