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RuntimeInfo-target.cpp
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RuntimeInfo-target.cpp
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/*
* Copyright (C) 2017 The Android Open Source Project
*
* 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.
*/
#define LOG_TAG "libvintf"
#include <android-base/logging.h>
#include <android-base/strings.h>
#include "RuntimeInfo.h"
#include "CompatibilityMatrix.h"
#include "KernelConfigParser.h"
#include "parse_string.h"
#include <dirent.h>
#include <errno.h>
#include <sys/utsname.h>
#include <unistd.h>
#include <fstream>
#include <iostream>
#include <sstream>
#include <android-base/properties.h>
#include <selinux/selinux.h>
#include <zlib.h>
#define PROC_CONFIG "/proc/config.gz"
#define BUFFER_SIZE sysconf(_SC_PAGESIZE)
static constexpr char kMainline[] = "-mainline-";
namespace android {
namespace vintf {
struct RuntimeInfoFetcher {
RuntimeInfoFetcher(RuntimeInfo *ki) : mRuntimeInfo(ki) { }
status_t fetchAllInformation(RuntimeInfo::FetchFlags flags);
private:
status_t fetchVersion(RuntimeInfo::FetchFlags flags);
status_t fetchKernelConfigs(RuntimeInfo::FetchFlags flags);
status_t fetchCpuInfo(RuntimeInfo::FetchFlags flags);
status_t fetchKernelSepolicyVers(RuntimeInfo::FetchFlags flags);
status_t fetchAvb(RuntimeInfo::FetchFlags flags);
status_t parseKernelVersion();
RuntimeInfo *mRuntimeInfo;
KernelConfigParser mConfigParser;
};
// decompress /proc/config.gz and read its contents.
status_t RuntimeInfoFetcher::fetchKernelConfigs(RuntimeInfo::FetchFlags) {
gzFile f = gzopen(PROC_CONFIG, "rb");
if (f == NULL) {
LOG(ERROR) << "Could not open /proc/config.gz: " << errno;
return -errno;
}
char buf[BUFFER_SIZE];
int len;
while ((len = gzread(f, buf, sizeof buf)) > 0) {
mConfigParser.process(buf, len);
}
status_t err = OK;
if (len < 0) {
int errnum;
const char *errmsg = gzerror(f, &errnum);
LOG(ERROR) << "Could not read /proc/config.gz: " << errmsg;
err = (errnum == Z_ERRNO ? -errno : errnum);
}
mConfigParser.finish();
gzclose(f);
mRuntimeInfo->mKernel.mConfigs = std::move(mConfigParser.configs());
return err;
}
status_t RuntimeInfoFetcher::fetchCpuInfo(RuntimeInfo::FetchFlags) {
// TODO implement this; 32-bit and 64-bit has different format.
std::ifstream in{"/proc/cpuinfo"};
if (!in.is_open()) {
LOG(WARNING) << "Cannot read /proc/cpuinfo";
return UNKNOWN_ERROR;
}
std::stringstream sstream;
sstream << in.rdbuf();
mRuntimeInfo->mCpuInfo = sstream.str();
return OK;
}
status_t RuntimeInfoFetcher::fetchKernelSepolicyVers(RuntimeInfo::FetchFlags) {
int pv;
#ifdef LIBVINTF_TARGET
pv = security_policyvers();
#else
pv = 0;
#endif
if (pv < 0) {
return pv;
}
mRuntimeInfo->mKernelSepolicyVersion = pv;
return OK;
}
status_t RuntimeInfoFetcher::fetchVersion(RuntimeInfo::FetchFlags flags) {
struct utsname buf;
if (uname(&buf)) {
return -errno;
}
mRuntimeInfo->mOsName = buf.sysname;
mRuntimeInfo->mNodeName = buf.nodename;
mRuntimeInfo->mOsRelease = buf.release;
mRuntimeInfo->mOsVersion = buf.version;
mRuntimeInfo->mHardwareId = buf.machine;
mRuntimeInfo->mIsMainline = mRuntimeInfo->mOsRelease.find(kMainline) != std::string::npos;
status_t err = RuntimeInfo::parseGkiKernelRelease(flags, mRuntimeInfo->mOsRelease,
&mRuntimeInfo->mKernel.mVersion,
&mRuntimeInfo->mKernel.mLevel);
if (err == OK) return OK;
err = parseKernelVersion();
if (err != OK) {
LOG(ERROR) << "Could not parse kernel version from \""
<< mRuntimeInfo->mOsRelease << "\"";
}
return err;
}
status_t RuntimeInfoFetcher::parseKernelVersion() {
auto pos = mRuntimeInfo->mOsRelease.find('.');
if (pos == std::string::npos) {
return UNKNOWN_ERROR;
}
pos = mRuntimeInfo->mOsRelease.find('.', pos + 1);
if (pos == std::string::npos) {
return UNKNOWN_ERROR;
}
pos = mRuntimeInfo->mOsRelease.find_first_not_of("0123456789", pos + 1);
// no need to check pos == std::string::npos, because substr will handle this
if (!parse(mRuntimeInfo->mOsRelease.substr(0, pos), &mRuntimeInfo->mKernel.mVersion)) {
return UNKNOWN_ERROR;
}
return OK;
}
status_t RuntimeInfoFetcher::fetchAvb(RuntimeInfo::FetchFlags) {
std::string prop = android::base::GetProperty("ro.boot.vbmeta.avb_version", "0.0");
if (!parse(prop, &mRuntimeInfo->mBootVbmetaAvbVersion)) {
return UNKNOWN_ERROR;
}
prop = android::base::GetProperty("ro.boot.avb_version", "0.0");
if (!parse(prop, &mRuntimeInfo->mBootAvbVersion)) {
return UNKNOWN_ERROR;
}
return OK;
}
struct FetchFunction {
RuntimeInfo::FetchFlags flags;
std::function<status_t(RuntimeInfoFetcher*, RuntimeInfo::FetchFlags)> fetch;
std::string description;
};
status_t RuntimeInfoFetcher::fetchAllInformation(RuntimeInfo::FetchFlags flags) {
using F = RuntimeInfo::FetchFlag;
using RF = RuntimeInfoFetcher;
// clang-format off
const static std::vector<FetchFunction> gFetchFunctions({
{F::CPU_VERSION | F::KERNEL_FCM, &RF::fetchVersion, "/proc/version"},
{F::CONFIG_GZ, &RF::fetchKernelConfigs, "/proc/config.gz"},
{F::CPU_INFO, &RF::fetchCpuInfo, "/proc/cpuinfo"},
{F::POLICYVERS, &RF::fetchKernelSepolicyVers, "kernel sepolicy version"},
{F::AVB, &RF::fetchAvb, "avb version"},
});
// clang-format on
status_t err;
for (const auto& fetchFunction : gFetchFunctions)
if ((flags & fetchFunction.flags) && ((err = fetchFunction.fetch(this, flags)) != OK))
LOG(WARNING) << "Cannot fetch or parse " << fetchFunction.description << ": "
<< strerror(-err);
return OK;
}
status_t RuntimeInfo::fetchAllInformation(RuntimeInfo::FetchFlags flags) {
return RuntimeInfoFetcher(this).fetchAllInformation(flags);
}
} // namespace vintf
} // namespace android