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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>
#ifdef GPR_LINUX_ENV
#include "src/core/lib/gpr/env.h"
#include <dlfcn.h>
#include <features.h>
#include <stdlib.h>
#include <string.h>
#include <grpc/support/log.h>
#include <grpc/support/string_util.h>
#include <grpc/support/useful.h>
#include "src/core/lib/gpr/string.h"
const char* gpr_getenv_silent(const char* name, char** dst) {
const char* insecure_func_used = nullptr;
char* result = nullptr;
#if defined(GPR_BACKWARDS_COMPATIBILITY_MODE)
typedef char* (*getenv_type)(const char*);
static getenv_type getenv_func = NULL;
/* Check to see which getenv variant is supported (go from most
* to least secure) */
const char* names[] = {"secure_getenv", "__secure_getenv", "getenv"};
for (size_t i = 0; getenv_func == NULL && i < GPR_ARRAY_SIZE(names); i++) {
getenv_func = (getenv_type)dlsym(RTLD_DEFAULT, names[i]);
if (getenv_func != NULL && strstr(names[i], "secure") == NULL) {
insecure_func_used = names[i];
}
}
result = getenv_func(name);
#elif __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17)
result = secure_getenv(name);
#else
result = getenv(name);
insecure_func_used = "getenv";
#endif
*dst = result == nullptr ? result : gpr_strdup(result);
return insecure_func_used;
}
char* gpr_getenv(const char* name) {
char* result = nullptr;
const char* insecure_func_used = gpr_getenv_silent(name, &result);
if (insecure_func_used != nullptr) {
gpr_log(GPR_DEBUG, "Warning: insecure environment read function '%s' used",
insecure_func_used);
}
return result;
}
void gpr_setenv(const char* name, const char* value) {
int res = setenv(name, value, 1);
GPR_ASSERT(res == 0);
}
#endif /* GPR_LINUX_ENV */
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