9c8d6dd7de
1) Check subsystems list before doing usb subsystem logic. This allows
developers to handle usb* subsystems in ueventd.rc files.
2) Fix a bug where each subsystem_ instance is not reinitialized, but
rather only the name_ member was set.
Test: boot bullhead
Test: check that multiple uevent_devname subsystems work when
specified in ueventd.rc
Change-Id: Ifcac04763afcaf72a3b14ef5f3a6cb89981b51a1
140 lines
4.5 KiB
C++
140 lines
4.5 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 "keyword_map.h"
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namespace android {
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namespace init {
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Result<Success> 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) {
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return Error() << "/sys/ lines must have 5 entries";
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}
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if (!is_sysfs && args.size() != 4) {
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return Error() << "/dev/ lines must have 4 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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if (is_sysfs) {
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out_sysfs_permissions->emplace_back(name, sysfs_attribute, perm, uid, gid);
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} else {
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out_dev_permissions->emplace_back(name, perm, uid, gid);
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}
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return Success();
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}
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Result<Success> 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 Success();
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}
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Result<Success> SubsystemParser::ParseDevName(std::vector<std::string>&& args) {
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if (args[1] == "uevent_devname") {
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subsystem_.devname_source_ = Subsystem::DevnameSource::DEVNAME_UEVENT_DEVNAME;
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return Success();
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}
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if (args[1] == "uevent_devpath") {
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subsystem_.devname_source_ = Subsystem::DevnameSource::DEVNAME_UEVENT_DEVPATH;
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return Success();
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}
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return Error() << "invalid devname '" << args[1] << "'";
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}
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Result<Success> 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 Success();
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}
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Result<Success> SubsystemParser::ParseLineSection(std::vector<std::string>&& args, int line) {
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using OptionParser = Result<Success> (SubsystemParser::*)(std::vector<std::string> && args);
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static class OptionParserMap : public KeywordMap<OptionParser> {
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private:
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const Map& map() const override {
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// clang-format off
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static const Map option_parsers = {
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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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return option_parsers;
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}
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} parser_map;
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auto parser = parser_map.FindFunction(args);
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if (!parser) return Error() << parser.error();
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return std::invoke(*parser, this, std::move(args));
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}
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void SubsystemParser::EndSection() {
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subsystems_->emplace_back(std::move(subsystem_));
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}
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} // namespace init
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} // namespace android
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