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 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 } 122 123 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