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 "general_systemd.hpp"
21 #include "prepare_systemd.hpp"
22 #include "update_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 <regex>
31 #include <sdbusplus/bus.hpp>
32 #include <string>
33 #include <vector>
34 
35 namespace ipmi_flash
36 {
37 
38 std::unique_ptr<TriggerableActionInterface>
39     buildFileSystemd(const nlohmann::json& data)
40 {
41     /* This type of action requires a path and unit, and optionally a mode. */
42     const auto& path = data.at("path");
43     const auto& unit = data.at("unit");
44 
45     /* the mode parameter is optional. */
46     std::string systemdMode = "replace";
47     const auto& mode = data.find("mode");
48     if (mode != data.end())
49     {
50         systemdMode = data.at("mode").get<std::string>();
51     }
52 
53     return SystemdWithStatusFile::CreateSystemdWithStatusFile(
54         sdbusplus::bus::new_default(), path, unit, systemdMode);
55 }
56 
57 std::vector<HandlerConfig> buildHandlerFromJson(const nlohmann::json& data)
58 {
59     std::vector<HandlerConfig> handlers;
60 
61     for (const auto& item : data)
62     {
63         try
64         {
65             HandlerConfig output;
66 
67             /* at() throws an exception when the key is not present. */
68             item.at("blob").get_to(output.blobId);
69 
70             /* name must be: /flash/... */
71             if (!std::regex_match(output.blobId, std::regex("^\\/flash\\/.+")))
72             {
73                 throw std::runtime_error("Invalid blob name: '" +
74                                          output.blobId +
75                                          "' must start with /flash/");
76             }
77 
78             /* handler is required. */
79             const auto& h = item.at("handler");
80             const std::string handlerType = h.at("type");
81             if (handlerType == "file")
82             {
83                 const auto& path = h.at("path");
84                 output.handler = std::make_unique<FileHandler>(path);
85             }
86             else
87             {
88                 throw std::runtime_error("Invalid handler type: " +
89                                          handlerType);
90             }
91 
92             /* actions are required (presently). */
93             const auto& a = item.at("actions");
94             std::unique_ptr<ActionPack> pack = std::make_unique<ActionPack>();
95 
96             /* It hasn't been fully determined if any action being optional is
97              * useful, so for now they will be required.
98              * TODO: Evaluate how the behaviors change if some actions are
99              * missing, does the code just assume it was successful?  I would
100              * think not.
101              */
102             const auto& prep = a.at("preparation");
103             const std::string prepareType = prep.at("type");
104             if (prepareType == "systemd")
105             {
106                 const auto& unit = prep.at("unit");
107                 pack->preparation = SystemdPreparation::CreatePreparation(
108                     sdbusplus::bus::new_default(), unit);
109             }
110             else
111             {
112                 throw std::runtime_error("Invalid preparation type: " +
113                                          prepareType);
114             }
115 
116             const auto& verify = a.at("verification");
117             const std::string verifyType = verify.at("type");
118             if (verifyType == "fileSystemdVerify")
119             {
120                 pack->verification = std::move(buildFileSystemd(verify));
121             }
122             else
123             {
124                 throw std::runtime_error("Invalid verification type:" +
125                                          verifyType);
126             }
127 
128             const auto& update = a.at("update");
129             const std::string updateType = update.at("type");
130             if (updateType == "reboot")
131             {
132                 pack->update = SystemdUpdateMechanism::CreateSystemdUpdate(
133                     sdbusplus::bus::new_default(), "reboot.target",
134                     "replace-irreversibly");
135             }
136             else if (updateType == "fileSystemdUpdate")
137             {
138                 pack->update = std::move(buildFileSystemd(update));
139             }
140             else if (updateType == "systemd")
141             {
142                 const auto& unit = update.at("unit");
143 
144                 /* the mode parameter is optional. */
145                 std::string systemdMode = "replace";
146                 const auto& mode = update.find("mode");
147                 if (mode != update.end())
148                 {
149                     systemdMode = update.at("mode").get<std::string>();
150                 }
151 
152                 pack->update = SystemdUpdateMechanism::CreateSystemdUpdate(
153                     sdbusplus::bus::new_default(), unit, systemdMode);
154             }
155             else
156             {
157                 throw std::runtime_error("Invalid update type: " + updateType);
158             }
159 
160             output.actions = std::move(pack);
161             handlers.push_back(std::move(output));
162         }
163         catch (const std::exception& e)
164         {
165             /* TODO: Once phosphor-logging supports unit-test injection, fix
166              * this to log.
167              */
168             std::fprintf(stderr,
169                          "Excepted building HandlerConfig from json: %s\n",
170                          e.what());
171         }
172     }
173 
174     return handlers;
175 }
176 
177 std::vector<HandlerConfig> BuildHandlerConfigs(const std::string& directory)
178 {
179     using namespace phosphor::logging;
180 
181     std::vector<HandlerConfig> output;
182 
183     std::vector<std::string> jsonPaths = GetJsonList(directory);
184 
185     for (const auto& path : jsonPaths)
186     {
187         std::ifstream jsonFile(path);
188         if (!jsonFile.is_open())
189         {
190             log<level::ERR>("Unable to open json file",
191                             entry("PATH=%s", path.c_str()));
192             continue;
193         }
194 
195         auto data = nlohmann::json::parse(jsonFile, nullptr, false);
196         if (data.is_discarded())
197         {
198             log<level::ERR>("Parsing json failed",
199                             entry("PATH=%s", path.c_str()));
200             continue;
201         }
202 
203         std::vector<HandlerConfig> configs = buildHandlerFromJson(data);
204         std::move(configs.begin(), configs.end(), std::back_inserter(output));
205     }
206 
207     return output;
208 }
209 
210 } // namespace ipmi_flash
211