1 /*
2 * Copyright (C) 2017 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
18 #define LOG_TAG "libvintf"
19 #include <android-base/logging.h>
20
21 #include "RuntimeInfo.h"
22
23 #include "CompatibilityMatrix.h"
24 #include "parse_string.h"
25
26 #include <dirent.h>
27 #include <errno.h>
28 #include <sys/utsname.h>
29 #include <unistd.h>
30
31 #include <fstream>
32 #include <iostream>
33 #include <sstream>
34
35 #include <android-base/properties.h>
36 #include <selinux/selinux.h>
37
38 #include "KernelConfigs.h"
39
40 namespace android {
41 namespace vintf {
42
43 struct RuntimeInfoFetcher {
RuntimeInfoFetcherandroid::vintf::RuntimeInfoFetcher44 RuntimeInfoFetcher(RuntimeInfo *ki) : mRuntimeInfo(ki) { }
45 status_t fetchAllInformation(RuntimeInfo::FetchFlags flags);
46
47 private:
48 status_t fetchVersion(RuntimeInfo::FetchFlags flags);
49 status_t fetchKernelConfigs(RuntimeInfo::FetchFlags flags);
50 status_t fetchCpuInfo(RuntimeInfo::FetchFlags flags);
51 status_t fetchKernelSepolicyVers(RuntimeInfo::FetchFlags flags);
52 status_t fetchAvb(RuntimeInfo::FetchFlags flags);
53 status_t parseKernelVersion();
54 RuntimeInfo* mRuntimeInfo;
55 };
56
57 // decompress /proc/config.gz and read its contents.
fetchKernelConfigs(RuntimeInfo::FetchFlags)58 status_t RuntimeInfoFetcher::fetchKernelConfigs(RuntimeInfo::FetchFlags) {
59 return kernelconfigs::LoadKernelConfigs(&mRuntimeInfo->mKernel.mConfigs);
60 }
61
fetchCpuInfo(RuntimeInfo::FetchFlags)62 status_t RuntimeInfoFetcher::fetchCpuInfo(RuntimeInfo::FetchFlags) {
63 // TODO implement this; 32-bit and 64-bit has different format.
64 std::ifstream in{"/proc/cpuinfo"};
65 if (!in.is_open()) {
66 LOG(WARNING) << "Cannot read /proc/cpuinfo";
67 return UNKNOWN_ERROR;
68 }
69 std::stringstream sstream;
70 sstream << in.rdbuf();
71 mRuntimeInfo->mCpuInfo = sstream.str();
72 return OK;
73 }
74
fetchKernelSepolicyVers(RuntimeInfo::FetchFlags)75 status_t RuntimeInfoFetcher::fetchKernelSepolicyVers(RuntimeInfo::FetchFlags) {
76 int pv;
77 #ifdef LIBVINTF_TARGET
78 pv = security_policyvers();
79 #else
80 pv = 0;
81 #endif
82 if (pv < 0) {
83 return pv;
84 }
85 mRuntimeInfo->mKernelSepolicyVersion = pv;
86 return OK;
87 }
88
fetchVersion(RuntimeInfo::FetchFlags flags)89 status_t RuntimeInfoFetcher::fetchVersion(RuntimeInfo::FetchFlags flags) {
90 struct utsname buf;
91 if (uname(&buf)) {
92 return -errno;
93 }
94 mRuntimeInfo->mOsName = buf.sysname;
95 mRuntimeInfo->mNodeName = buf.nodename;
96 mRuntimeInfo->mOsRelease = buf.release;
97 mRuntimeInfo->mOsVersion = buf.version;
98 mRuntimeInfo->mHardwareId = buf.machine;
99
100 mRuntimeInfo->mIsMainline = RuntimeInfo::kernelReleaseIsMainline(mRuntimeInfo->mOsRelease);
101
102 status_t err = RuntimeInfo::parseGkiKernelRelease(flags, mRuntimeInfo->mOsRelease,
103 &mRuntimeInfo->mKernel.mVersion,
104 &mRuntimeInfo->mKernel.mLevel);
105 if (err == OK) return OK;
106
107 err = parseKernelVersion();
108 if (err != OK) {
109 LOG(ERROR) << "Could not parse kernel version from \""
110 << mRuntimeInfo->mOsRelease << "\"";
111 }
112 return err;
113 }
114
parseKernelVersion()115 status_t RuntimeInfoFetcher::parseKernelVersion() {
116 auto pos = mRuntimeInfo->mOsRelease.find('.');
117 if (pos == std::string::npos) {
118 return UNKNOWN_ERROR;
119 }
120 pos = mRuntimeInfo->mOsRelease.find('.', pos + 1);
121 if (pos == std::string::npos) {
122 return UNKNOWN_ERROR;
123 }
124 pos = mRuntimeInfo->mOsRelease.find_first_not_of("0123456789", pos + 1);
125 // no need to check pos == std::string::npos, because substr will handle this
126 if (!parse(mRuntimeInfo->mOsRelease.substr(0, pos), &mRuntimeInfo->mKernel.mVersion)) {
127 return UNKNOWN_ERROR;
128 }
129 return OK;
130 }
131
fetchAvb(RuntimeInfo::FetchFlags)132 status_t RuntimeInfoFetcher::fetchAvb(RuntimeInfo::FetchFlags) {
133 std::string prop = android::base::GetProperty("ro.boot.vbmeta.avb_version", "0.0");
134 if (!parse(prop, &mRuntimeInfo->mBootVbmetaAvbVersion)) {
135 return UNKNOWN_ERROR;
136 }
137 prop = android::base::GetProperty("ro.boot.avb_version", "0.0");
138 if (!parse(prop, &mRuntimeInfo->mBootAvbVersion)) {
139 return UNKNOWN_ERROR;
140 }
141 return OK;
142 }
143
144 struct FetchFunction {
145 RuntimeInfo::FetchFlags flags;
146 std::function<status_t(RuntimeInfoFetcher*, RuntimeInfo::FetchFlags)> fetch;
147 std::string description;
148 };
149
fetchAllInformation(RuntimeInfo::FetchFlags flags)150 status_t RuntimeInfoFetcher::fetchAllInformation(RuntimeInfo::FetchFlags flags) {
151 using F = RuntimeInfo::FetchFlag;
152 using RF = RuntimeInfoFetcher;
153 // clang-format off
154 const static std::vector<FetchFunction> gFetchFunctions({
155 {F::CPU_VERSION | F::KERNEL_FCM, &RF::fetchVersion, "/proc/version"},
156 {F::CONFIG_GZ, &RF::fetchKernelConfigs, "/proc/config.gz"},
157 {F::CPU_INFO, &RF::fetchCpuInfo, "/proc/cpuinfo"},
158 {F::POLICYVERS, &RF::fetchKernelSepolicyVers, "kernel sepolicy version"},
159 {F::AVB, &RF::fetchAvb, "avb version"},
160 });
161 // clang-format on
162
163 status_t err;
164 for (const auto& fetchFunction : gFetchFunctions)
165 if ((flags & fetchFunction.flags) && ((err = fetchFunction.fetch(this, flags)) != OK))
166 LOG(WARNING) << "Cannot fetch or parse " << fetchFunction.description << ": "
167 << strerror(-err);
168
169 return OK;
170 }
171
fetchAllInformation(RuntimeInfo::FetchFlags flags)172 status_t RuntimeInfo::fetchAllInformation(RuntimeInfo::FetchFlags flags) {
173 return RuntimeInfoFetcher(this).fetchAllInformation(flags);
174 }
175
176 } // namespace vintf
177 } // namespace android
178