1 /*
2 * Copyright 2019 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 "os/system_properties.h"
18
19 #include <bluetooth/log.h>
20 #include <cutils/properties.h>
21
22 #include <array>
23 #include <cctype>
24
25 #include "common/strings.h"
26 #include "os/log.h"
27
28 namespace bluetooth {
29 namespace os {
30
GetSystemProperty(const std::string & property)31 std::optional<std::string> GetSystemProperty(const std::string& property) {
32 std::array<char, PROPERTY_VALUE_MAX> value_array{0};
33 auto value_len = property_get(property.c_str(), value_array.data(), nullptr);
34 if (value_len <= 0) {
35 return std::nullopt;
36 }
37 return std::string(value_array.data(), value_len);
38 }
39
SetSystemProperty(const std::string & property,const std::string & value)40 bool SetSystemProperty(const std::string& property, const std::string& value) {
41 if (value.size() >= PROPERTY_VALUE_MAX) {
42 log::error(
43 "Property value's maximum size is {}, but {} chars were given",
44 PROPERTY_VALUE_MAX - 1,
45 value.size());
46 return false;
47 }
48 auto ret = property_set(property.c_str(), value.c_str());
49 if (ret != 0) {
50 log::error("Set property {} failed with error code {}", property, ret);
51 return false;
52 }
53 return true;
54 }
55
IsRootCanalEnabled()56 bool IsRootCanalEnabled() {
57 auto value = GetSystemProperty("ro.vendor.build.fingerprint");
58 if (value.has_value()) {
59 log::info("ro.vendor.build.fingerprint='{}', length={}", value->c_str(), value->length());
60 } else {
61 log::info("ro.vendor.build.fingerprint is not found");
62 }
63 // aosp_cf_x86_64_phone is just one platform that currently runs root canal
64 // When other platforms appears, or there is a better signal, add them here
65 if (value->find("generic/aosp_cf_x86_64_phone") == std::string::npos) {
66 log::info("Not on generic/aosp_cf_x86_64_phone and hence not root canal");
67 return false;
68 }
69 return true;
70 }
71
GetAndroidVendorReleaseVersion()72 int GetAndroidVendorReleaseVersion() {
73 auto value = GetSystemProperty("ro.vendor.build.version.release_or_codename");
74 if (!value) {
75 log::info("ro.vendor.build.version.release_or_codename does not exist");
76 return 0;
77 }
78 log::info(
79 "ro.vendor.build.version.release_or_codename='{}', length={}",
80 value->c_str(),
81 value->length());
82 auto int_value = common::Int64FromString(*value);
83 if (int_value) {
84 return static_cast<int>(*int_value);
85 }
86 log::info("value '{}' cannot be parsed to int", value->c_str());
87 if (value->empty()) {
88 log::info("value '{}' is empty", value->c_str());
89 return 0;
90 }
91 if (value->length() > 1) {
92 log::info("value '{}' length is {}, which is > 1", value->c_str(), value->length());
93 }
94 char release_code = toupper(value->at(0));
95 switch (release_code) {
96 case 'S':
97 return 11;
98 case 'R':
99 return 10;
100 case 'P':
101 return 9;
102 case 'O':
103 return 8;
104 default:
105 // Treble not enabled before Android O
106 return 0;
107 }
108 }
109
ClearSystemPropertiesForHost()110 bool ClearSystemPropertiesForHost() {
111 return false;
112 }
113
114 } // namespace os
115 } // namespace bluetooth
116