1 /* Icinga 2 | (c) 2012 Icinga GmbH | GPLv2+ */
2
3 #include "livestatus/livestatuslistener.hpp"
4 #include "livestatus/livestatuslistener-ti.cpp"
5 #include "base/utility.hpp"
6 #include "base/perfdatavalue.hpp"
7 #include "base/objectlock.hpp"
8 #include "base/configtype.hpp"
9 #include "base/logger.hpp"
10 #include "base/exception.hpp"
11 #include "base/tcpsocket.hpp"
12 #include "base/unixsocket.hpp"
13 #include "base/networkstream.hpp"
14 #include "base/application.hpp"
15 #include "base/function.hpp"
16 #include "base/statsfunction.hpp"
17 #include "base/convert.hpp"
18
19 using namespace icinga;
20
21 REGISTER_TYPE(LivestatusListener);
22
23 static int l_ClientsConnected = 0;
24 static int l_Connections = 0;
25 static std::mutex l_ComponentMutex;
26
27 REGISTER_STATSFUNCTION(LivestatusListener, &LivestatusListener::StatsFunc);
28
StatsFunc(const Dictionary::Ptr & status,const Array::Ptr & perfdata)29 void LivestatusListener::StatsFunc(const Dictionary::Ptr& status, const Array::Ptr& perfdata)
30 {
31 DictionaryData nodes;
32
33 for (const LivestatusListener::Ptr& livestatuslistener : ConfigType::GetObjectsByType<LivestatusListener>()) {
34 nodes.emplace_back(livestatuslistener->GetName(), new Dictionary({
35 { "connections", l_Connections }
36 }));
37
38 perfdata->Add(new PerfdataValue("livestatuslistener_" + livestatuslistener->GetName() + "_connections", l_Connections));
39 }
40
41 status->Set("livestatuslistener", new Dictionary(std::move(nodes)));
42 }
43
44 /**
45 * Starts the component.
46 */
Start(bool runtimeCreated)47 void LivestatusListener::Start(bool runtimeCreated)
48 {
49 ObjectImpl<LivestatusListener>::Start(runtimeCreated);
50
51 Log(LogInformation, "LivestatusListener")
52 << "'" << GetName() << "' started.";
53
54 if (GetSocketType() == "tcp") {
55 TcpSocket::Ptr socket = new TcpSocket();
56
57 try {
58 socket->Bind(GetBindHost(), GetBindPort(), AF_UNSPEC);
59 } catch (std::exception&) {
60 Log(LogCritical, "LivestatusListener")
61 << "Cannot bind TCP socket on host '" << GetBindHost() << "' port '" << GetBindPort() << "'.";
62 return;
63 }
64
65 m_Listener = socket;
66
67 m_Thread = std::thread([this]() { ServerThreadProc(); });
68
69 Log(LogInformation, "LivestatusListener")
70 << "Created TCP socket listening on host '" << GetBindHost() << "' port '" << GetBindPort() << "'.";
71 }
72 else if (GetSocketType() == "unix") {
73 #ifndef _WIN32
74 UnixSocket::Ptr socket = new UnixSocket();
75
76 try {
77 socket->Bind(GetSocketPath());
78 } catch (std::exception&) {
79 Log(LogCritical, "LivestatusListener")
80 << "Cannot bind UNIX socket to '" << GetSocketPath() << "'.";
81 return;
82 }
83
84 /* group must be able to write */
85 mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP;
86
87 if (chmod(GetSocketPath().CStr(), mode) < 0) {
88 Log(LogCritical, "LivestatusListener")
89 << "chmod() on unix socket '" << GetSocketPath() << "' failed with error code " << errno << ", \"" << Utility::FormatErrorNumber(errno) << "\"";
90 return;
91 }
92
93 m_Listener = socket;
94
95 m_Thread = std::thread([this]() { ServerThreadProc(); });
96
97 Log(LogInformation, "LivestatusListener")
98 << "Created UNIX socket in '" << GetSocketPath() << "'.";
99 #else
100 /* no UNIX sockets on windows */
101 Log(LogCritical, "LivestatusListener", "Unix sockets are not supported on Windows.");
102 return;
103 #endif
104 }
105 }
106
Stop(bool runtimeRemoved)107 void LivestatusListener::Stop(bool runtimeRemoved)
108 {
109 ObjectImpl<LivestatusListener>::Stop(runtimeRemoved);
110
111 Log(LogInformation, "LivestatusListener")
112 << "'" << GetName() << "' stopped.";
113
114 m_Listener->Close();
115
116 if (m_Thread.joinable())
117 m_Thread.join();
118 }
119
GetClientsConnected()120 int LivestatusListener::GetClientsConnected()
121 {
122 std::unique_lock<std::mutex> lock(l_ComponentMutex);
123
124 return l_ClientsConnected;
125 }
126
GetConnections()127 int LivestatusListener::GetConnections()
128 {
129 std::unique_lock<std::mutex> lock(l_ComponentMutex);
130
131 return l_Connections;
132 }
133
ServerThreadProc()134 void LivestatusListener::ServerThreadProc()
135 {
136 m_Listener->Listen();
137
138 try {
139 for (;;) {
140 timeval tv = { 0, 500000 };
141
142 if (m_Listener->Poll(true, false, &tv)) {
143 Socket::Ptr client = m_Listener->Accept();
144 Log(LogNotice, "LivestatusListener", "Client connected");
145 Utility::QueueAsyncCallback([this, client]() { ClientHandler(client); }, LowLatencyScheduler);
146 }
147
148 if (!IsActive())
149 break;
150 }
151 } catch (std::exception&) {
152 Log(LogCritical, "LivestatusListener", "Cannot accept new connection.");
153 }
154
155 m_Listener->Close();
156 }
157
ClientHandler(const Socket::Ptr & client)158 void LivestatusListener::ClientHandler(const Socket::Ptr& client)
159 {
160 {
161 std::unique_lock<std::mutex> lock(l_ComponentMutex);
162 l_ClientsConnected++;
163 l_Connections++;
164 }
165
166 Stream::Ptr stream = new NetworkStream(client);
167
168 StreamReadContext context;
169
170 for (;;) {
171 String line;
172
173 std::vector<String> lines;
174
175 for (;;) {
176 StreamReadStatus srs = stream->ReadLine(&line, context);
177
178 if (srs == StatusEof)
179 break;
180
181 if (srs != StatusNewItem)
182 continue;
183
184 if (line.GetLength() > 0)
185 lines.push_back(line);
186 else
187 break;
188 }
189
190 if (lines.empty())
191 break;
192
193 LivestatusQuery::Ptr query = new LivestatusQuery(lines, GetCompatLogPath());
194 if (!query->Execute(stream))
195 break;
196 }
197
198 {
199 std::unique_lock<std::mutex> lock(l_ComponentMutex);
200 l_ClientsConnected--;
201 }
202 }
203
204
ValidateSocketType(const Lazy<String> & lvalue,const ValidationUtils & utils)205 void LivestatusListener::ValidateSocketType(const Lazy<String>& lvalue, const ValidationUtils& utils)
206 {
207 ObjectImpl<LivestatusListener>::ValidateSocketType(lvalue, utils);
208
209 if (lvalue() != "unix" && lvalue() != "tcp")
210 BOOST_THROW_EXCEPTION(ValidationError(this, { "socket_type" }, "Socket type '" + lvalue() + "' is invalid."));
211 }
212