1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
|
/*
*
* 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/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"
const char *gpr_getenv_silent(const char *name, char **dst) {
const char *insecure_func_used = NULL;
char *result = NULL;
#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 == NULL ? result : gpr_strdup(result);
return insecure_func_used;
}
char *gpr_getenv(const char *name) {
char *result = NULL;
const char *insecure_func_used = gpr_getenv_silent(name, &result);
if (insecure_func_used != NULL) {
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 */
|
