1 /*
2  * Copyright 2019 Google Inc.
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 #include "buildjson.hpp"
17 
18 #include "file_handler.hpp"
19 #include "fs.hpp"
20 #include "prepare_systemd.hpp"
21 #include "update_systemd.hpp"
22 #include "verify_systemd.hpp"
23 
24 #include <algorithm>
25 #include <cstdio>
26 #include <exception>
27 #include <fstream>
28 #include <nlohmann/json.hpp>
29 #include <phosphor-logging/log.hpp>
30 #include <sdbusplus/bus.hpp>
31 #include <string>
32 #include <vector>
33 
34 namespace ipmi_flash
35 {
36 
37 std::vector<HandlerConfig> buildHandlerFromJson(const nlohmann::json& data)
38 {
39     std::vector<HandlerConfig> handlers;
40 
41     for (const auto& item : data)
42     {
43         try
44         {
45             HandlerConfig output;
46 
47             /* at() throws an exception when the key is not present. */
48             item.at("blob").get_to(output.blobId);
49 
50             /* handler is required. */
51             const auto& h = item.at("handler");
52             const std::string handlerType = h.at("type");
53             if (handlerType == "file")
54             {
55                 const auto& path = h.at("path");
56                 output.handler = std::make_unique<FileHandler>(path);
57             }
58             else
59             {
60                 throw std::runtime_error("Invalid handler type: " +
61                                          handlerType);
62             }
63 
64             /* actions are required (presently). */
65             const auto& a = item.at("actions");
66             std::unique_ptr<ActionPack> pack = std::make_unique<ActionPack>();
67 
68             /* It hasn't been fully determined if any action being optional is
69              * useful, so for now they will be required.
70              * TODO: Evaluate how the behaviors change if some actions are
71              * missing, does the code just assume it was successful?  I would
72              * think not.
73              */
74             const auto& prep = a.at("preparation");
75             const std::string prepareType = prep.at("type");
76             if (prepareType == "systemd")
77             {
78                 const auto& unit = prep.at("unit");
79                 pack->preparation = SystemdPreparation::CreatePreparation(
80                     sdbusplus::bus::new_default(), unit);
81             }
82             else
83             {
84                 throw std::runtime_error("Invalid preparation type: " +
85                                          prepareType);
86             }
87 
88             const auto& verify = a.at("verification");
89             const std::string verifyType = verify.at("type");
90             if (verifyType == "fileSystemdVerify")
91             {
92                 const auto& path = verify.at("path");
93                 const auto& unit = verify.at("unit");
94                 const std::string mode = "replace";
95                 pack->verification = SystemdVerification::CreateVerification(
96                     sdbusplus::bus::new_default(), path, unit, mode);
97             }
98             else
99             {
100                 throw std::runtime_error("Invalid verification type:" +
101                                          verifyType);
102             }
103 
104             const auto& update = a.at("update");
105             const std::string updateType = update.at("type");
106             if (updateType == "reboot")
107             {
108                 static constexpr auto rebootTarget = "reboot.target";
109                 static constexpr auto rebootMode = "replace-irreversibly";
110                 pack->update = SystemdUpdateMechanism::CreateSystemdUpdate(
111                     sdbusplus::bus::new_default(), rebootTarget, rebootMode);
112             }
113             else if (updateType == "systemd")
114             {
115                 const auto& unit = update.at("unit");
116 
117                 /* the mode parameter is optional. */
118                 std::string systemdMode = "replace";
119                 const auto& mode = update.find("mode");
120                 if (mode != update.end())
121                 {
122                     systemdMode = update.at("mode").get<std::string>();
123                 }
124 
125                 pack->update = SystemdUpdateMechanism::CreateSystemdUpdate(
126                     sdbusplus::bus::new_default(), unit, systemdMode);
127             }
128             else
129             {
130                 throw std::runtime_error("Invalid update type: " + updateType);
131             }
132 
133             output.actions = std::move(pack);
134             handlers.push_back(std::move(output));
135         }
136         catch (const std::exception& e)
137         {
138             /* TODO: Once phosphor-logging supports unit-test injection, fix
139              * this to log.
140              */
141             std::fprintf(stderr,
142                          "Excepted building HandlerConfig from json: %s\n",
143                          e.what());
144         }
145     }
146 
147     return handlers;
148 }
149 
150 std::vector<HandlerConfig> BuildHandlerConfigs(const std::string& directory)
151 {
152     using namespace phosphor::logging;
153 
154     std::vector<HandlerConfig> output;
155 
156     std::vector<std::string> jsonPaths = GetJsonList(directory);
157 
158     for (const auto& path : jsonPaths)
159     {
160         std::ifstream jsonFile(path);
161         if (!jsonFile.is_open())
162         {
163             log<level::ERR>("Unable to open json file",
164                             entry("PATH=%s", path.c_str()));
165             continue;
166         }
167 
168         auto data = nlohmann::json::parse(jsonFile, nullptr, false);
169         if (data.is_discarded())
170         {
171             log<level::ERR>("Parsing json failed",
172                             entry("PATH=%s", path.c_str()));
173             continue;
174         }
175 
176         std::vector<HandlerConfig> configs = buildHandlerFromJson(data);
177         std::move(configs.begin(), configs.end(), std::back_inserter(output));
178     }
179 
180     return output;
181 }
182 
183 } // namespace ipmi_flash
184