1 /*
2 * Copyright (C) 2020 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdlib.h>
18
19 #include "sysdeps/env.h"
20
21 #ifdef _WIN32
22 #include <lmcons.h>
23 #include <windows.h>
24 #endif // _WIN32
25
26 #include <android-base/utf8.h>
27
28 namespace adb {
29 namespace sysdeps {
30
GetEnvironmentVariable(std::string_view var)31 std::optional<std::string> GetEnvironmentVariable(std::string_view var) {
32 if (var.empty()) {
33 return std::nullopt;
34 }
35
36 #ifdef _WIN32
37 constexpr size_t kMaxEnvVarSize = 32767;
38 wchar_t wbuf[kMaxEnvVarSize];
39 std::wstring wvar;
40 if (!android::base::UTF8ToWide(var.data(), &wvar)) {
41 return std::nullopt;
42 }
43
44 auto sz = ::GetEnvironmentVariableW(wvar.data(), wbuf, sizeof(wbuf));
45 if (sz == 0) {
46 return std::nullopt;
47 }
48
49 std::string val;
50 if (!android::base::WideToUTF8(wbuf, &val)) {
51 return std::nullopt;
52 }
53
54 return std::make_optional(val);
55 #else // !_WIN32
56 const char* val = getenv(var.data());
57 if (val == nullptr) {
58 return std::nullopt;
59 }
60
61 return std::make_optional(std::string(val));
62 #endif
63 }
64
65 #ifdef _WIN32
66 constexpr char kHostNameEnvVar[] = "COMPUTERNAME";
67 constexpr char kUserNameEnvVar[] = "USERNAME";
68 #else
69 constexpr char kHostNameEnvVar[] = "HOSTNAME";
70 constexpr char kUserNameEnvVar[] = "LOGNAME";
71 #endif
72
GetHostNameUTF8()73 std::string GetHostNameUTF8() {
74 const auto hostName = GetEnvironmentVariable(kHostNameEnvVar);
75 if (hostName && !hostName->empty()) {
76 return *hostName;
77 }
78
79 #ifdef _WIN32
80 wchar_t wbuf[MAX_COMPUTERNAME_LENGTH + 1];
81 DWORD size = sizeof(wbuf);
82 if (!GetComputerNameW(wbuf, &size) || size == 0) {
83 return "";
84 }
85
86 std::string name;
87 if (!android::base::WideToUTF8(wbuf, &name)) {
88 return "";
89 }
90
91 return name;
92 #else // !_WIN32
93 char buf[256];
94 return (gethostname(buf, sizeof(buf)) == -1) ? "" : buf;
95 #endif // _WIN32
96 }
97
GetLoginNameUTF8()98 std::string GetLoginNameUTF8() {
99 const auto userName = GetEnvironmentVariable(kUserNameEnvVar);
100 if (userName && !userName->empty()) {
101 return *userName;
102 }
103
104 #ifdef _WIN32
105 wchar_t wbuf[UNLEN + 1];
106 DWORD size = sizeof(wbuf);
107 if (!GetUserNameW(wbuf, &size) || size == 0) {
108 return "";
109 }
110
111 std::string login;
112 if (!android::base::WideToUTF8(wbuf, &login)) {
113 return "";
114 }
115
116 return login;
117 #else // !_WIN32
118 const char* login = getlogin();
119 return login ? login : "";
120 #endif // _WIN32
121 }
122
123 } // namespace sysdeps
124 } // namespace adb
125