1/* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#include "parser.h" 18 19#include <dirent.h> 20 21#include <android-base/chrono_utils.h> 22#include <android-base/logging.h> 23#include <android-base/stringprintf.h> 24#include <android-base/strings.h> 25 26#include "tokenizer.h" 27#include "util.h" 28 29namespace android { 30namespace init { 31 32Parser::Parser() {} 33 34void Parser::AddSectionParser(const std::string& name, std::unique_ptr<SectionParser> parser) { 35 section_parsers_[name] = std::move(parser); 36} 37 38void Parser::AddSingleLineParser(const std::string& prefix, LineCallback callback) { 39 line_callbacks_.emplace_back(prefix, callback); 40} 41 42void Parser::ParseData(const std::string& filename, const std::string& data, size_t* parse_errors) { 43 // TODO: Use a parser with const input and remove this copy 44 std::vector<char> data_copy(data.begin(), data.end()); 45 data_copy.push_back('\0'); 46 47 parse_state state; 48 state.line = 0; 49 state.ptr = &data_copy[0]; 50 state.nexttoken = 0; 51 52 SectionParser* section_parser = nullptr; 53 int section_start_line = -1; 54 std::vector<std::string> args; 55 56 auto end_section = [&] { 57 if (section_parser == nullptr) return; 58 59 if (auto result = section_parser->EndSection(); !result) { 60 (*parse_errors)++; 61 LOG(ERROR) << filename << ": " << section_start_line << ": " << result.error(); 62 } 63 64 section_parser = nullptr; 65 section_start_line = -1; 66 }; 67 68 for (;;) { 69 switch (next_token(&state)) { 70 case T_EOF: 71 end_section(); 72 return; 73 case T_NEWLINE: 74 state.line++; 75 if (args.empty()) break; 76 // If we have a line matching a prefix we recognize, call its callback and unset any 77 // current section parsers. This is meant for /sys/ and /dev/ line entries for 78 // uevent. 79 for (const auto& [prefix, callback] : line_callbacks_) { 80 if (android::base::StartsWith(args[0], prefix)) { 81 end_section(); 82 83 if (auto result = callback(std::move(args)); !result) { 84 (*parse_errors)++; 85 LOG(ERROR) << filename << ": " << state.line << ": " << result.error(); 86 } 87 break; 88 } 89 } 90 if (section_parsers_.count(args[0])) { 91 end_section(); 92 section_parser = section_parsers_[args[0]].get(); 93 section_start_line = state.line; 94 if (auto result = 95 section_parser->ParseSection(std::move(args), filename, state.line); 96 !result) { 97 (*parse_errors)++; 98 LOG(ERROR) << filename << ": " << state.line << ": " << result.error(); 99 section_parser = nullptr; 100 } 101 } else if (section_parser) { 102 if (auto result = section_parser->ParseLineSection(std::move(args), state.line); 103 !result) { 104 (*parse_errors)++; 105 LOG(ERROR) << filename << ": " << state.line << ": " << result.error(); 106 } 107 } 108 args.clear(); 109 break; 110 case T_TEXT: 111 args.emplace_back(state.text); 112 break; 113 } 114 } 115} 116 117bool Parser::ParseConfigFile(const std::string& path, size_t* parse_errors) { 118 LOG(INFO) << "Parsing file " << path << "..."; 119 android::base::Timer t; 120 auto config_contents = ReadFile(path); 121 if (!config_contents) { 122 LOG(ERROR) << "Unable to read config file '" << path << "': " << config_contents.error(); 123 return false; 124 } 125 126 config_contents->push_back('\n'); // TODO: fix parse_config. 127 ParseData(path, *config_contents, parse_errors); 128 for (const auto& [section_name, section_parser] : section_parsers_) { 129 section_parser->EndFile(); 130 } 131 132 LOG(VERBOSE) << "(Parsing " << path << " took " << t << ".)"; 133 return true; 134} 135 136bool Parser::ParseConfigDir(const std::string& path, size_t* parse_errors) { 137 LOG(INFO) << "Parsing directory " << path << "..."; 138 std::unique_ptr<DIR, decltype(&closedir)> config_dir(opendir(path.c_str()), closedir); 139 if (!config_dir) { 140 PLOG(ERROR) << "Could not import directory '" << path << "'"; 141 return false; 142 } 143 dirent* current_file; 144 std::vector<std::string> files; 145 while ((current_file = readdir(config_dir.get()))) { 146 // Ignore directories and only process regular files. 147 if (current_file->d_type == DT_REG) { 148 std::string current_path = 149 android::base::StringPrintf("%s/%s", path.c_str(), current_file->d_name); 150 files.emplace_back(current_path); 151 } 152 } 153 // Sort first so we load files in a consistent order (bug 31996208) 154 std::sort(files.begin(), files.end()); 155 for (const auto& file : files) { 156 if (!ParseConfigFile(file, parse_errors)) { 157 LOG(ERROR) << "could not import file '" << file << "'"; 158 } 159 } 160 return true; 161} 162 163bool Parser::ParseConfig(const std::string& path) { 164 size_t parse_errors; 165 return ParseConfig(path, &parse_errors); 166} 167 168bool Parser::ParseConfig(const std::string& path, size_t* parse_errors) { 169 *parse_errors = 0; 170 if (is_dir(path.c_str())) { 171 return ParseConfigDir(path, parse_errors); 172 } 173 return ParseConfigFile(path, parse_errors); 174} 175 176} // namespace init 177} // namespace android 178