1 #pragma once
2 #include "app.hpp"
3 #include "async_resp.hpp"
4 #include "dbus_singleton.hpp"
5 #include "openbmc_dbus_rest.hpp"
6 #include "websocket.hpp"
7
8 #include <boost/container/flat_map.hpp>
9 #include <boost/container/flat_set.hpp>
10 #include <sdbusplus/bus/match.hpp>
11 #include <sdbusplus/message/types.hpp>
12
13 #include <variant>
14
15 namespace crow
16 {
17 namespace dbus_monitor
18 {
19
20 struct DbusWebsocketSession
21 {
22 std::vector<std::unique_ptr<sdbusplus::bus::match_t>> matches;
23 boost::container::flat_set<std::string, std::less<>,
24 std::vector<std::string>>
25 interfaces;
26 };
27
28 using SessionMap = boost::container::flat_map<crow::websocket::Connection*,
29 DbusWebsocketSession>;
30
31 // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
32 static SessionMap sessions;
33
onPropertyUpdate(sd_bus_message * m,void * userdata,sd_bus_error * retError)34 inline int onPropertyUpdate(sd_bus_message* m, void* userdata,
35 sd_bus_error* retError)
36 {
37 if (retError == nullptr || (sd_bus_error_is_set(retError) != 0))
38 {
39 BMCWEB_LOG_ERROR("Got sdbus error on match");
40 return 0;
41 }
42 crow::websocket::Connection* connection =
43 static_cast<crow::websocket::Connection*>(userdata);
44 auto thisSession = sessions.find(connection);
45 if (thisSession == sessions.end())
46 {
47 BMCWEB_LOG_ERROR("Couldn't find dbus connection {}",
48 logPtr(connection));
49 return 0;
50 }
51 sdbusplus::message_t message(m);
52 nlohmann::json json;
53 json["event"] = message.get_member();
54 json["path"] = message.get_path();
55 if (strcmp(message.get_member(), "PropertiesChanged") == 0)
56 {
57 nlohmann::json data;
58 int r = openbmc_mapper::convertDBusToJSON("sa{sv}as", message, data);
59 if (r < 0)
60 {
61 BMCWEB_LOG_ERROR("convertDBusToJSON failed with {}", r);
62 return 0;
63 }
64 if (!data.is_array())
65 {
66 BMCWEB_LOG_ERROR("No data in PropertiesChanged signal");
67 return 0;
68 }
69
70 // data is type sa{sv}as and is an array[3] of string, object, array
71 json["interface"] = data[0];
72 json["properties"] = data[1];
73 }
74 else if (strcmp(message.get_member(), "InterfacesAdded") == 0)
75 {
76 nlohmann::json data;
77 int r = openbmc_mapper::convertDBusToJSON("oa{sa{sv}}", message, data);
78 if (r < 0)
79 {
80 BMCWEB_LOG_ERROR("convertDBusToJSON failed with {}", r);
81 return 0;
82 }
83 nlohmann::json::array_t* arr = data.get_ptr<nlohmann::json::array_t*>();
84 if (arr == nullptr)
85 {
86 BMCWEB_LOG_ERROR("No data in InterfacesAdded signal");
87 return 0;
88 }
89 if (arr->size() < 2)
90 {
91 BMCWEB_LOG_ERROR("No data in InterfacesAdded signal");
92 return 0;
93 }
94
95 nlohmann::json::object_t* obj =
96 (*arr)[1].get_ptr<nlohmann::json::object_t*>();
97 if (obj == nullptr)
98 {
99 BMCWEB_LOG_ERROR("No data in InterfacesAdded signal");
100 return 0;
101 }
102 // data is type oa{sa{sv}} which is an array[2] of string, object
103 for (const auto& entry : *obj)
104 {
105 auto it = thisSession->second.interfaces.find(entry.first);
106 if (it != thisSession->second.interfaces.end())
107 {
108 json["interfaces"][entry.first] = entry.second;
109 }
110 }
111 }
112 else
113 {
114 BMCWEB_LOG_CRITICAL("message {} was unexpected", message.get_member());
115 return 0;
116 }
117
118 connection->sendText(
119 json.dump(2, ' ', true, nlohmann::json::error_handler_t::replace));
120 return 0;
121 }
122
requestRoutes(App & app)123 inline void requestRoutes(App& app)
124 {
125 BMCWEB_ROUTE(app, "/subscribe")
126 .privileges({{"Login"}})
127 .websocket()
128 .onopen([&](crow::websocket::Connection& conn) {
129 BMCWEB_LOG_DEBUG("Connection {} opened", logPtr(&conn));
130 sessions.try_emplace(&conn);
131 })
132 .onclose([&](crow::websocket::Connection& conn, const std::string&) {
133 sessions.erase(&conn);
134 })
135 .onmessage([&](crow::websocket::Connection& conn,
136 const std::string& data, bool) {
137 const auto sessionPair = sessions.find(&conn);
138 if (sessionPair == sessions.end())
139 {
140 conn.close("Internal error");
141 }
142 DbusWebsocketSession& thisSession = sessionPair->second;
143 BMCWEB_LOG_DEBUG("Connection {} received {}", logPtr(&conn), data);
144 nlohmann::json j = nlohmann::json::parse(data, nullptr, false);
145 if (j.is_discarded())
146 {
147 BMCWEB_LOG_ERROR("Unable to parse json data for monitor");
148 conn.close("Unable to parse json request");
149 return;
150 }
151 nlohmann::json::iterator interfaces = j.find("interfaces");
152 if (interfaces != j.end())
153 {
154 thisSession.interfaces.reserve(interfaces->size());
155 for (auto& interface : *interfaces)
156 {
157 const std::string* str =
158 interface.get_ptr<const std::string*>();
159 if (str != nullptr)
160 {
161 thisSession.interfaces.insert(*str);
162 }
163 }
164 }
165
166 nlohmann::json::iterator paths = j.find("paths");
167 if (paths == j.end())
168 {
169 BMCWEB_LOG_ERROR("Unable to find paths in json data");
170 conn.close("Unable to find paths in json data");
171 return;
172 }
173
174 size_t interfaceCount = thisSession.interfaces.size();
175 if (interfaceCount == 0)
176 {
177 interfaceCount = 1;
178 }
179
180 // These regexes derived on the rules here:
181 // https://dbus.freedesktop.org/doc/dbus-specification.html#message-protocol-names
182 static std::regex validPath("^/([A-Za-z0-9_]+/?)*$");
183 static std::regex validInterface(
184 "^[A-Za-z_][A-Za-z0-9_]*(\\.[A-Za-z_][A-Za-z0-9_]*)+$");
185
186 for (const auto& thisPath : *paths)
187 {
188 const std::string* thisPathString =
189 thisPath.get_ptr<const std::string*>();
190 if (thisPathString == nullptr)
191 {
192 BMCWEB_LOG_ERROR("subscribe path isn't a string?");
193 conn.close();
194 return;
195 }
196 if (!std::regex_match(*thisPathString, validPath))
197 {
198 BMCWEB_LOG_ERROR("Invalid path name {}", *thisPathString);
199 conn.close();
200 return;
201 }
202 std::string propertiesMatchString =
203 ("type='signal',"
204 "interface='org.freedesktop.DBus.Properties',"
205 "path_namespace='" +
206 *thisPathString +
207 "',"
208 "member='PropertiesChanged'");
209 // If interfaces weren't specified, add a single match for all
210 // interfaces
211 if (thisSession.interfaces.empty())
212 {
213 BMCWEB_LOG_DEBUG("Creating match {}",
214 propertiesMatchString);
215
216 thisSession.matches.emplace_back(
217 std::make_unique<sdbusplus::bus::match_t>(
218 *crow::connections::systemBus,
219 propertiesMatchString, onPropertyUpdate, &conn));
220 }
221 else
222 {
223 // If interfaces were specified, add a match for each
224 // interface
225 for (const std::string& interface : thisSession.interfaces)
226 {
227 if (!std::regex_match(interface, validInterface))
228 {
229 BMCWEB_LOG_ERROR("Invalid interface name {}",
230 interface);
231 conn.close();
232 return;
233 }
234 std::string ifaceMatchString = propertiesMatchString;
235 ifaceMatchString += ",arg0='";
236 ifaceMatchString += interface;
237 ifaceMatchString += "'";
238 BMCWEB_LOG_DEBUG("Creating match {}", ifaceMatchString);
239 thisSession.matches.emplace_back(
240 std::make_unique<sdbusplus::bus::match_t>(
241 *crow::connections::systemBus, ifaceMatchString,
242 onPropertyUpdate, &conn));
243 }
244 }
245 std::string objectManagerMatchString =
246 ("type='signal',"
247 "interface='org.freedesktop.DBus.ObjectManager',"
248 "path_namespace='" +
249 *thisPathString +
250 "',"
251 "member='InterfacesAdded'");
252 BMCWEB_LOG_DEBUG("Creating match {}", objectManagerMatchString);
253 thisSession.matches.emplace_back(
254 std::make_unique<sdbusplus::bus::match_t>(
255 *crow::connections::systemBus, objectManagerMatchString,
256 onPropertyUpdate, &conn));
257 }
258 });
259 }
260 } // namespace dbus_monitor
261 } // namespace crow
262