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
30Parser::Parser() {
31}
32
33Parser& Parser::GetInstance() {
34    static Parser instance;
35    return instance;
36}
37
38void Parser::AddSectionParser(const std::string& name,
39                              std::unique_ptr<SectionParser> parser) {
40    section_parsers_[name] = std::move(parser);
41}
42
43void 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
95bool Parser::ParseConfigFile(const std::string& path) {
96    INFO("Parsing file %s...\n", path.c_str());
97    Timer t;
98    std::string data;
99    if (!read_file(path.c_str(), &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    // Turning this on and letting the INFO logging be discarded adds 0.2s to
110    // Nexus 9 boot time, so it's disabled by default.
111    if (false) DumpState();
112
113    NOTICE("(Parsing %s took %.2fs.)\n", path.c_str(), t.duration());
114    return true;
115}
116
117bool Parser::ParseConfigDir(const std::string& path) {
118    INFO("Parsing directory %s...\n", path.c_str());
119    std::unique_ptr<DIR, int(*)(DIR*)> config_dir(opendir(path.c_str()), closedir);
120    if (!config_dir) {
121        ERROR("Could not import directory '%s'\n", path.c_str());
122        return false;
123    }
124    dirent* current_file;
125    std::vector<std::string> files;
126    while ((current_file = readdir(config_dir.get()))) {
127        // Ignore directories and only process regular files.
128        if (current_file->d_type == DT_REG) {
129            std::string current_path =
130                android::base::StringPrintf("%s/%s", path.c_str(), current_file->d_name);
131            files.emplace_back(current_path);
132        }
133    }
134    // Sort first so we load files in a consistent order (bug 31996208)
135    std::sort(files.begin(), files.end());
136    for (const auto& file : files) {
137        if (!ParseConfigFile(file)) {
138            ERROR("Could not import file '%s'\n", file.c_str());
139        }
140    }
141    return true;
142}
143
144bool Parser::ParseConfig(const std::string& path) {
145    if (is_dir(path.c_str())) {
146        return ParseConfigDir(path);
147    }
148    return ParseConfigFile(path);
149}
150
151void Parser::DumpState() const {
152    ServiceManager::GetInstance().DumpState();
153    ActionManager::GetInstance().DumpState();
154}
155