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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.
*/
#include "ueventd_parser.h"
#include <grp.h>
#include <pwd.h>
#include <android-base/parseint.h>
#include "keyword_map.h"
#include "parser.h"
using android::base::ParseByteCount;
namespace android {
namespace init {
Result<Success> ParsePermissionsLine(std::vector<std::string>&& args,
std::vector<SysfsPermissions>* out_sysfs_permissions,
std::vector<Permissions>* out_dev_permissions) {
bool is_sysfs = out_sysfs_permissions != nullptr;
if (is_sysfs && args.size() != 5) {
return Error() << "/sys/ lines must have 5 entries";
}
if (!is_sysfs && args.size() != 4) {
return Error() << "/dev/ lines must have 4 entries";
}
auto it = args.begin();
const std::string& name = *it++;
std::string sysfs_attribute;
if (is_sysfs) sysfs_attribute = *it++;
// args is now common to both sys and dev entries and contains: <perm> <uid> <gid>
std::string& perm_string = *it++;
char* end_pointer = 0;
mode_t perm = strtol(perm_string.c_str(), &end_pointer, 8);
if (end_pointer == nullptr || *end_pointer != '\0') {
return Error() << "invalid mode '" << perm_string << "'";
}
std::string& uid_string = *it++;
passwd* pwd = getpwnam(uid_string.c_str());
if (!pwd) {
return Error() << "invalid uid '" << uid_string << "'";
}
uid_t uid = pwd->pw_uid;
std::string& gid_string = *it++;
struct group* grp = getgrnam(gid_string.c_str());
if (!grp) {
return Error() << "invalid gid '" << gid_string << "'";
}
gid_t gid = grp->gr_gid;
if (is_sysfs) {
out_sysfs_permissions->emplace_back(name, sysfs_attribute, perm, uid, gid);
} else {
out_dev_permissions->emplace_back(name, perm, uid, gid);
}
return Success();
}
Result<Success> ParseFirmwareDirectoriesLine(std::vector<std::string>&& args,
std::vector<std::string>* firmware_directories) {
if (args.size() < 2) {
return Error() << "firmware_directories must have at least 1 entry";
}
std::move(std::next(args.begin()), args.end(), std::back_inserter(*firmware_directories));
return Success();
}
Result<Success> ParseModaliasHandlingLine(std::vector<std::string>&& args,
bool* enable_modalias_handling) {
if (args.size() != 2) {
return Error() << "modalias_handling lines take exactly one parameter";
}
if (args[1] == "enabled") {
*enable_modalias_handling = true;
} else if (args[1] == "disabled") {
*enable_modalias_handling = false;
} else {
return Error() << "modalias_handling takes either 'enabled' or 'disabled' as a parameter";
}
return Success();
}
Result<Success> ParseUeventSocketRcvbufSizeLine(std::vector<std::string>&& args,
size_t* uevent_socket_rcvbuf_size) {
if (args.size() != 2) {
return Error() << "uevent_socket_rcvbuf_size lines take exactly one parameter";
}
size_t parsed_size;
if (!ParseByteCount(args[1], &parsed_size)) {
return Error() << "could not parse size '" << args[1] << "' for uevent_socket_rcvbuf_line";
}
*uevent_socket_rcvbuf_size = parsed_size;
return Success();
}
class SubsystemParser : public SectionParser {
public:
SubsystemParser(std::vector<Subsystem>* subsystems) : subsystems_(subsystems) {}
Result<Success> ParseSection(std::vector<std::string>&& args, const std::string& filename,
int line) override;
Result<Success> ParseLineSection(std::vector<std::string>&& args, int line) override;
Result<Success> EndSection() override;
private:
Result<Success> ParseDevName(std::vector<std::string>&& args);
Result<Success> ParseDirName(std::vector<std::string>&& args);
Subsystem subsystem_;
std::vector<Subsystem>* subsystems_;
};
Result<Success> SubsystemParser::ParseSection(std::vector<std::string>&& args,
const std::string& filename, int line) {
if (args.size() != 2) {
return Error() << "subsystems must have exactly one name";
}
if (std::find(subsystems_->begin(), subsystems_->end(), args[1]) != subsystems_->end()) {
return Error() << "ignoring duplicate subsystem entry";
}
subsystem_ = Subsystem(std::move(args[1]));
return Success();
}
Result<Success> SubsystemParser::ParseDevName(std::vector<std::string>&& args) {
if (args[1] == "uevent_devname") {
subsystem_.devname_source_ = Subsystem::DEVNAME_UEVENT_DEVNAME;
return Success();
}
if (args[1] == "uevent_devpath") {
subsystem_.devname_source_ = Subsystem::DEVNAME_UEVENT_DEVPATH;
return Success();
}
return Error() << "invalid devname '" << args[1] << "'";
}
Result<Success> SubsystemParser::ParseDirName(std::vector<std::string>&& args) {
if (args[1].front() != '/') {
return Error() << "dirname '" << args[1] << " ' does not start with '/'";
}
subsystem_.dir_name_ = args[1];
return Success();
}
Result<Success> SubsystemParser::ParseLineSection(std::vector<std::string>&& args, int line) {
using OptionParser = Result<Success> (SubsystemParser::*)(std::vector<std::string> && args);
static class OptionParserMap : public KeywordMap<OptionParser> {
private:
const Map& map() const override {
// clang-format off
static const Map option_parsers = {
{"devname", {1, 1, &SubsystemParser::ParseDevName}},
{"dirname", {1, 1, &SubsystemParser::ParseDirName}},
};
// clang-format on
return option_parsers;
}
} parser_map;
auto parser = parser_map.FindFunction(args);
if (!parser) return Error() << parser.error();
return std::invoke(*parser, this, std::move(args));
}
Result<Success> SubsystemParser::EndSection() {
subsystems_->emplace_back(std::move(subsystem_));
return Success();
}
UeventdConfiguration ParseConfig(const std::vector<std::string>& configs) {
Parser parser;
UeventdConfiguration ueventd_configuration;
parser.AddSectionParser("subsystem",
std::make_unique<SubsystemParser>(&ueventd_configuration.subsystems));
using namespace std::placeholders;
parser.AddSingleLineParser(
"/sys/",
std::bind(ParsePermissionsLine, _1, &ueventd_configuration.sysfs_permissions, nullptr));
parser.AddSingleLineParser("/dev/", std::bind(ParsePermissionsLine, _1, nullptr,
&ueventd_configuration.dev_permissions));
parser.AddSingleLineParser("firmware_directories",
std::bind(ParseFirmwareDirectoriesLine, _1,
&ueventd_configuration.firmware_directories));
parser.AddSingleLineParser("modalias_handling",
std::bind(ParseModaliasHandlingLine, _1,
&ueventd_configuration.enable_modalias_handling));
parser.AddSingleLineParser("uevent_socket_rcvbuf_size",
std::bind(ParseUeventSocketRcvbufSizeLine, _1,
&ueventd_configuration.uevent_socket_rcvbuf_size));
for (const auto& config : configs) {
parser.ParseConfig(config);
}
return ueventd_configuration;
}
} // namespace init
} // namespace android
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