269 lines
9.4 KiB
C++
269 lines
9.4 KiB
C++
/*
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* Copyright (C) 2017 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ueventd_parser.h"
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#include <grp.h>
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#include <pwd.h>
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#include <android-base/parseint.h>
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#include "import_parser.h"
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#include "keyword_map.h"
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#include "parser.h"
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using android::base::ParseByteCount;
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namespace android {
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namespace init {
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Result<void> ParsePermissionsLine(std::vector<std::string>&& args,
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std::vector<SysfsPermissions>* out_sysfs_permissions,
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std::vector<Permissions>* out_dev_permissions) {
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bool is_sysfs = out_sysfs_permissions != nullptr;
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if (is_sysfs && !(args.size() == 5 || args.size() == 6)) {
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return Error() << "/sys/ lines must have 5 or 6 entries";
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}
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if (!is_sysfs && !(args.size() == 4 || args.size() == 5)) {
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return Error() << "/dev/ lines must have 4 or 5 entries";
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}
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auto it = args.begin();
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const std::string& name = *it++;
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std::string sysfs_attribute;
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if (is_sysfs) sysfs_attribute = *it++;
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// args is now common to both sys and dev entries and contains: <perm> <uid> <gid>
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std::string& perm_string = *it++;
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char* end_pointer = 0;
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mode_t perm = strtol(perm_string.c_str(), &end_pointer, 8);
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if (end_pointer == nullptr || *end_pointer != '\0') {
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return Error() << "invalid mode '" << perm_string << "'";
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}
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std::string& uid_string = *it++;
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passwd* pwd = getpwnam(uid_string.c_str());
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if (!pwd) {
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return Error() << "invalid uid '" << uid_string << "'";
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}
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uid_t uid = pwd->pw_uid;
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std::string& gid_string = *it++;
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struct group* grp = getgrnam(gid_string.c_str());
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if (!grp) {
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return Error() << "invalid gid '" << gid_string << "'";
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}
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gid_t gid = grp->gr_gid;
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bool no_fnm_pathname = false;
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if (it != args.end()) {
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std::string& flags = *it++;
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if (flags != "no_fnm_pathname") {
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return Error() << "invalid option '" << flags << "', only no_fnm_pathname is supported";
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}
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no_fnm_pathname = true;
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}
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if (is_sysfs) {
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out_sysfs_permissions->emplace_back(name, sysfs_attribute, perm, uid, gid, no_fnm_pathname);
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} else {
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out_dev_permissions->emplace_back(name, perm, uid, gid, no_fnm_pathname);
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}
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return {};
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}
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Result<void> ParseFirmwareDirectoriesLine(std::vector<std::string>&& args,
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std::vector<std::string>* firmware_directories) {
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if (args.size() < 2) {
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return Error() << "firmware_directories must have at least 1 entry";
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}
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std::move(std::next(args.begin()), args.end(), std::back_inserter(*firmware_directories));
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return {};
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}
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Result<void> ParseExternalFirmwareHandlerLine(
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std::vector<std::string>&& args,
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std::vector<ExternalFirmwareHandler>* external_firmware_handlers) {
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if (args.size() != 4) {
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return Error() << "external_firmware_handler lines must have exactly 3 parameters";
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}
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if (std::find_if(external_firmware_handlers->begin(), external_firmware_handlers->end(),
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[&args](const auto& other) { return other.devpath == args[2]; }) !=
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external_firmware_handlers->end()) {
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return Error() << "found a previous external_firmware_handler with the same devpath, '"
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<< args[2] << "'";
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}
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passwd* pwd = getpwnam(args[2].c_str());
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if (!pwd) {
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return ErrnoError() << "invalid handler uid'" << args[2] << "'";
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}
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ExternalFirmwareHandler handler(std::move(args[1]), pwd->pw_uid, std::move(args[3]));
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external_firmware_handlers->emplace_back(std::move(handler));
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return {};
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}
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Result<void> ParseEnabledDisabledLine(std::vector<std::string>&& args, bool* feature) {
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if (args.size() != 2) {
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return Error() << args[0] << " lines take exactly one parameter";
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}
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if (args[1] == "enabled") {
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*feature = true;
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} else if (args[1] == "disabled") {
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*feature = false;
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} else {
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return Error() << args[0] << " takes either 'enabled' or 'disabled' as a parameter";
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}
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return {};
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}
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Result<void> ParseUeventSocketRcvbufSizeLine(std::vector<std::string>&& args,
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size_t* uevent_socket_rcvbuf_size) {
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if (args.size() != 2) {
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return Error() << "uevent_socket_rcvbuf_size lines take exactly one parameter";
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}
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size_t parsed_size;
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if (!ParseByteCount(args[1], &parsed_size)) {
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return Error() << "could not parse size '" << args[1] << "' for uevent_socket_rcvbuf_line";
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}
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*uevent_socket_rcvbuf_size = parsed_size;
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return {};
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}
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class SubsystemParser : public SectionParser {
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public:
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SubsystemParser(std::vector<Subsystem>* subsystems) : subsystems_(subsystems) {}
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Result<void> ParseSection(std::vector<std::string>&& args, const std::string& filename,
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int line) override;
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Result<void> ParseLineSection(std::vector<std::string>&& args, int line) override;
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Result<void> EndSection() override;
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private:
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Result<void> ParseDevName(std::vector<std::string>&& args);
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Result<void> ParseDirName(std::vector<std::string>&& args);
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Subsystem subsystem_;
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std::vector<Subsystem>* subsystems_;
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};
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Result<void> SubsystemParser::ParseSection(std::vector<std::string>&& args,
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const std::string& filename, int line) {
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if (args.size() != 2) {
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return Error() << "subsystems must have exactly one name";
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}
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if (std::find(subsystems_->begin(), subsystems_->end(), args[1]) != subsystems_->end()) {
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return Error() << "ignoring duplicate subsystem entry";
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}
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subsystem_ = Subsystem(std::move(args[1]));
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return {};
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}
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Result<void> SubsystemParser::ParseDevName(std::vector<std::string>&& args) {
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if (args[1] == "uevent_devname") {
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subsystem_.devname_source_ = Subsystem::DEVNAME_UEVENT_DEVNAME;
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return {};
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}
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if (args[1] == "uevent_devpath") {
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subsystem_.devname_source_ = Subsystem::DEVNAME_UEVENT_DEVPATH;
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return {};
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}
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return Error() << "invalid devname '" << args[1] << "'";
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}
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Result<void> SubsystemParser::ParseDirName(std::vector<std::string>&& args) {
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if (args[1].front() != '/') {
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return Error() << "dirname '" << args[1] << " ' does not start with '/'";
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}
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subsystem_.dir_name_ = args[1];
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return {};
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}
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Result<void> SubsystemParser::ParseLineSection(std::vector<std::string>&& args, int line) {
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using OptionParser = Result<void> (SubsystemParser::*)(std::vector<std::string> && args);
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// clang-format off
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static const KeywordMap<OptionParser> parser_map = {
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{"devname", {1, 1, &SubsystemParser::ParseDevName}},
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{"dirname", {1, 1, &SubsystemParser::ParseDirName}},
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};
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// clang-format on
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auto parser = parser_map.Find(args);
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if (!parser.ok()) return Error() << parser.error();
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return std::invoke(*parser, this, std::move(args));
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}
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Result<void> SubsystemParser::EndSection() {
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subsystems_->emplace_back(std::move(subsystem_));
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return {};
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}
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UeventdConfiguration ParseConfig(const std::string& config) {
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Parser parser;
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UeventdConfiguration ueventd_configuration;
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parser.AddSectionParser("import", std::make_unique<ImportParser>(&parser));
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parser.AddSectionParser("subsystem",
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std::make_unique<SubsystemParser>(&ueventd_configuration.subsystems));
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using namespace std::placeholders;
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parser.AddSingleLineParser(
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"/sys/",
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std::bind(ParsePermissionsLine, _1, &ueventd_configuration.sysfs_permissions, nullptr));
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parser.AddSingleLineParser("/dev/", std::bind(ParsePermissionsLine, _1, nullptr,
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&ueventd_configuration.dev_permissions));
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parser.AddSingleLineParser("firmware_directories",
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std::bind(ParseFirmwareDirectoriesLine, _1,
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&ueventd_configuration.firmware_directories));
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parser.AddSingleLineParser("external_firmware_handler",
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std::bind(ParseExternalFirmwareHandlerLine, _1,
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&ueventd_configuration.external_firmware_handlers));
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parser.AddSingleLineParser("modalias_handling",
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std::bind(ParseEnabledDisabledLine, _1,
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&ueventd_configuration.enable_modalias_handling));
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parser.AddSingleLineParser("uevent_socket_rcvbuf_size",
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std::bind(ParseUeventSocketRcvbufSizeLine, _1,
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&ueventd_configuration.uevent_socket_rcvbuf_size));
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parser.AddSingleLineParser("parallel_restorecon",
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std::bind(ParseEnabledDisabledLine, _1,
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&ueventd_configuration.enable_parallel_restorecon));
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parser.ParseConfig(config);
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return ueventd_configuration;
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}
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} // namespace init
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} // namespace android
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