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/*
*
* Copyright 2015-2016, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/* for secure_getenv. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <grpc/support/port_platform.h>
#ifdef GPR_LINUX_ENV
#include "src/core/lib/support/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/support/string.h"
char *gpr_getenv(const char *name) {
#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) {
gpr_log(GPR_DEBUG,
"Warning: insecure environment read function '%s' used",
names[i]);
}
}
char *result = getenv_func(name);
return result == NULL ? result : gpr_strdup(result);
#elif __GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 17)
char *result = secure_getenv(name);
return result == NULL ? result : gpr_strdup(result);
#else
gpr_log(GPR_DEBUG, "Warning: insecure environment read function '%s' used",
"getenv");
char *result = getenv(name);
return result == NULL ? result : gpr_strdup(result);
#endif
}
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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