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