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/*
* Copyright (C) 2019 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.
*/
#include "src/traced/probes/packages_list/packages_list_data_source.h"
#include "perfetto/ext/base/scoped_file.h"
#include "perfetto/ext/base/string_splitter.h"
#include "perfetto/ext/tracing/core/trace_writer.h"
#include "protos/perfetto/trace/trace_packet.pbzero.h"
using perfetto::protos::pbzero::PackagesListConfig;
namespace perfetto {
// static
const ProbesDataSource::Descriptor PackagesListDataSource::descriptor = {
/*name*/ "android.packages_list",
/*flags*/ Descriptor::kFlagsNone,
};
bool ParsePackagesListStream(protos::pbzero::PackagesList* packages_list_packet,
const base::ScopedFstream& fs,
const std::set<std::string>& package_name_filter) {
bool parsed_fully = true;
char line[2048];
while (fgets(line, sizeof(line), *fs) != nullptr) {
Package pkg_struct;
if (!ReadPackagesListLine(line, &pkg_struct)) {
parsed_fully = false;
continue;
}
if (!package_name_filter.empty() &&
package_name_filter.count(pkg_struct.name) == 0) {
continue;
}
auto* package = packages_list_packet->add_packages();
package->set_name(pkg_struct.name.c_str(), pkg_struct.name.size());
package->set_uid(pkg_struct.uid);
package->set_debuggable(pkg_struct.debuggable);
package->set_profileable_from_shell(pkg_struct.profileable_from_shell);
package->set_version_code(pkg_struct.version_code);
}
return parsed_fully;
}
bool ReadPackagesListLine(char* line, Package* package) {
size_t idx = 0;
for (base::StringSplitter ss(line, ' '); ss.Next();) {
switch (idx) {
case 0:
package->name = std::string(ss.cur_token(), ss.cur_token_size());
break;
case 1: {
char* end;
long long uid = strtoll(ss.cur_token(), &end, 10);
if ((*end != '\0' && *end != '\n') || *ss.cur_token() == '\0') {
PERFETTO_ELOG("Failed to parse packages.list uid.");
return false;
}
package->uid = static_cast<uint64_t>(uid);
break;
}
case 2: {
char* end;
long long debuggable = strtoll(ss.cur_token(), &end, 10);
if ((*end != '\0' && *end != '\n') || *ss.cur_token() == '\0') {
PERFETTO_ELOG("Failed to parse packages.list debuggable.");
return false;
}
package->debuggable = debuggable != 0;
break;
}
case 6: {
char* end;
long long profilable_from_shell = strtoll(ss.cur_token(), &end, 10);
if ((*end != '\0' && *end != '\n') || *ss.cur_token() == '\0') {
PERFETTO_ELOG("Failed to parse packages.list profilable_from_shell.");
return false;
}
package->profileable_from_shell = profilable_from_shell != 0;
break;
}
case 7: {
char* end;
long long version_code = strtoll(ss.cur_token(), &end, 10);
if ((*end != '\0' && *end != '\n') || *ss.cur_token() == '\0') {
PERFETTO_ELOG("Failed to parse packages.list version_code: %s.",
ss.cur_token());
return false;
}
package->version_code = version_code;
break;
}
}
++idx;
}
return true;
}
PackagesListDataSource::PackagesListDataSource(
const DataSourceConfig& ds_config,
TracingSessionID session_id,
std::unique_ptr<TraceWriter> writer)
: ProbesDataSource(session_id, &descriptor), writer_(std::move(writer)) {
PackagesListConfig::Decoder cfg(ds_config.packages_list_config_raw());
for (auto name = cfg.package_name_filter(); name; ++name) {
package_name_filter_.emplace((*name).ToStdString());
}
}
void PackagesListDataSource::Start() {
base::ScopedFstream fs(fopen("/data/system/packages.list", "r"));
auto trace_packet = writer_->NewTracePacket();
auto* packages_list_packet = trace_packet->set_packages_list();
if (!fs) {
PERFETTO_ELOG("Failed to open packages.list");
packages_list_packet->set_read_error(true);
trace_packet->Finalize();
writer_->Flush();
return;
}
bool parsed_fully =
ParsePackagesListStream(packages_list_packet, fs, package_name_filter_);
if (!parsed_fully)
packages_list_packet->set_parse_error(true);
if (ferror(*fs))
packages_list_packet->set_read_error(true);
trace_packet->Finalize();
writer_->Flush();
}
void PackagesListDataSource::Flush(FlushRequestID,
std::function<void()> callback) {
// Flush is no-op. We flush after the first write.
callback();
}
PackagesListDataSource::~PackagesListDataSource() = default;
} // namespace perfetto
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