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      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 <dirent.h>
     18 #include <errno.h>
     19 #include <fcntl.h>
     20 
     21 #include "action.h"
     22 #include "init_parser.h"
     23 #include "log.h"
     24 #include "parser.h"
     25 #include "service.h"
     26 #include "util.h"
     27 
     28 #include <android-base/stringprintf.h>
     29 
     30 Parser::Parser() {
     31 }
     32 
     33 Parser& Parser::GetInstance() {
     34     static Parser instance;
     35     return instance;
     36 }
     37 
     38 void Parser::AddSectionParser(const std::string& name,
     39                               std::unique_ptr<SectionParser> parser) {
     40     section_parsers_[name] = std::move(parser);
     41 }
     42 
     43 void Parser::ParseData(const std::string& filename, const std::string& data) {
     44     //TODO: Use a parser with const input and remove this copy
     45     std::vector<char> data_copy(data.begin(), data.end());
     46     data_copy.push_back('\0');
     47 
     48     parse_state state;
     49     state.filename = filename.c_str();
     50     state.line = 0;
     51     state.ptr = &data_copy[0];
     52     state.nexttoken = 0;
     53 
     54     SectionParser* section_parser = nullptr;
     55     std::vector<std::string> args;
     56 
     57     for (;;) {
     58         switch (next_token(&state)) {
     59         case T_EOF:
     60             if (section_parser) {
     61                 section_parser->EndSection();
     62             }
     63             return;
     64         case T_NEWLINE:
     65             state.line++;
     66             if (args.empty()) {
     67                 break;
     68             }
     69             if (section_parsers_.count(args[0])) {
     70                 if (section_parser) {
     71                     section_parser->EndSection();
     72                 }
     73                 section_parser = section_parsers_[args[0]].get();
     74                 std::string ret_err;
     75                 if (!section_parser->ParseSection(args, &ret_err)) {
     76                     parse_error(&state, "%s\n", ret_err.c_str());
     77                     section_parser = nullptr;
     78                 }
     79             } else if (section_parser) {
     80                 std::string ret_err;
     81                 if (!section_parser->ParseLineSection(args, state.filename,
     82                                                       state.line, &ret_err)) {
     83                     parse_error(&state, "%s\n", ret_err.c_str());
     84                 }
     85             }
     86             args.clear();
     87             break;
     88         case T_TEXT:
     89             args.emplace_back(state.text);
     90             break;
     91         }
     92     }
     93 }
     94 
     95 bool Parser::ParseConfigFile(const std::string& path) {
     96     LOG(INFO) << "Parsing file " << path << "...";
     97     Timer t;
     98     std::string data;
     99     if (!read_file(path, &data)) {
    100         return false;
    101     }
    102 
    103     data.push_back('\n'); // TODO: fix parse_config.
    104     ParseData(path, data);
    105     for (const auto& sp : section_parsers_) {
    106         sp.second->EndFile(path);
    107     }
    108 
    109     LOG(VERBOSE) << "(Parsing " << path << " took " << t << ".)";
    110     return true;
    111 }
    112 
    113 bool Parser::ParseConfigDir(const std::string& path) {
    114     LOG(INFO) << "Parsing directory " << path << "...";
    115     std::unique_ptr<DIR, int(*)(DIR*)> config_dir(opendir(path.c_str()), closedir);
    116     if (!config_dir) {
    117         PLOG(ERROR) << "Could not import directory '" << path << "'";
    118         return false;
    119     }
    120     dirent* current_file;
    121     std::vector<std::string> files;
    122     while ((current_file = readdir(config_dir.get()))) {
    123         // Ignore directories and only process regular files.
    124         if (current_file->d_type == DT_REG) {
    125             std::string current_path =
    126                 android::base::StringPrintf("%s/%s", path.c_str(), current_file->d_name);
    127             files.emplace_back(current_path);
    128         }
    129     }
    130     // Sort first so we load files in a consistent order (bug 31996208)
    131     std::sort(files.begin(), files.end());
    132     for (const auto& file : files) {
    133         if (!ParseConfigFile(file)) {
    134             LOG(ERROR) << "could not import file '" << file << "'";
    135         }
    136     }
    137     return true;
    138 }
    139 
    140 bool Parser::ParseConfig(const std::string& path) {
    141     if (is_dir(path.c_str())) {
    142         return ParseConfigDir(path);
    143     }
    144     return ParseConfigFile(path);
    145 }
    146 
    147 void Parser::DumpState() const {
    148     ServiceManager::GetInstance().DumpState();
    149     ActionManager::GetInstance().DumpState();
    150 }
    151