| /* |
| * |
| * 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 "src/core/lib/gpr/string.h" |
| #include "src/core/lib/gpr/useful.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 */ |