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43e5396b DG |
1 | /* |
2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> | |
3 | * | |
4 | * This library is free software; you can redistribute it and/or modify it | |
5 | * under the terms of the GNU Lesser General Public License, version 2.1 only, | |
6 | * as published by the Free Software Foundation. | |
7 | * | |
8 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
11 | * for more details. | |
12 | * | |
13 | * You should have received a copy of the GNU Lesser General Public License | |
14 | * along with this library; if not, write to the Free Software Foundation, | |
15 | * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
16 | */ | |
17 | ||
18 | package org.lttng.ust.jul; | |
19 | ||
20 | import java.util.concurrent.Semaphore; | |
21 | import java.nio.ByteBuffer; | |
22 | import java.nio.ByteOrder; | |
23 | import java.lang.Integer; | |
24 | import java.io.IOException; | |
25 | import java.io.BufferedOutputStream; | |
f1fa0535 | 26 | import java.io.BufferedReader; |
43e5396b DG |
27 | import java.io.ByteArrayOutputStream; |
28 | import java.io.DataOutputStream; | |
29 | import java.io.DataInputStream; | |
f1fa0535 DG |
30 | import java.io.FileReader; |
31 | import java.io.FileNotFoundException; | |
43e5396b DG |
32 | import java.net.*; |
33 | import java.lang.management.ManagementFactory; | |
529e6def | 34 | import java.util.logging.Logger; |
43e5396b DG |
35 | |
36 | class USTRegisterMsg { | |
37 | public static int pid; | |
38 | } | |
39 | ||
40 | public class LTTngTCPSessiondClient { | |
41 | /* Command header from the session deamon. */ | |
42 | private LTTngSessiondCmd2_4.sessiond_hdr headerCmd = | |
43 | new LTTngSessiondCmd2_4.sessiond_hdr(); | |
44 | ||
45 | private final String sessiondHost; | |
43e5396b DG |
46 | private Socket sessiondSock; |
47 | private boolean quit = false; | |
48 | ||
49 | private DataInputStream inFromSessiond; | |
50 | private DataOutputStream outToSessiond; | |
51 | ||
52 | private LTTngLogHandler handler; | |
53 | ||
54 | private Semaphore registerSem; | |
55 | ||
2b8f5235 DG |
56 | private static final String rootPortFile = "/var/run/lttng/agent.port"; |
57 | private static final String userPortFile = "/.lttng/agent.port"; | |
58 | /* | |
59 | * This is taken from the lttng/domain.h file which is mapped to | |
60 | * LTTNG_DOMAIN_JUL value for this agent. | |
61 | */ | |
62 | private static final int agent_domain = 3; | |
f1fa0535 DG |
63 | |
64 | /* Indicate if we've already release the semaphore. */ | |
65 | private boolean sem_posted = false; | |
66 | ||
67 | public LTTngTCPSessiondClient(String host, Semaphore sem) { | |
43e5396b | 68 | this.sessiondHost = host; |
43e5396b | 69 | this.registerSem = sem; |
43e5396b DG |
70 | } |
71 | ||
f1fa0535 DG |
72 | /* |
73 | * Try to release the registerSem if it's not already done. | |
74 | */ | |
75 | private void tryReleaseSem() | |
76 | { | |
77 | /* Release semaphore so we unblock the agent. */ | |
78 | if (!this.sem_posted) { | |
79 | this.registerSem.release(); | |
80 | this.sem_posted = true; | |
81 | } | |
82 | } | |
83 | ||
87d64abb DG |
84 | /* |
85 | * Cleanup Agent state. | |
86 | */ | |
87 | private void cleanupState() { | |
87d64abb DG |
88 | if (this.handler != null) { |
89 | this.handler.clear(); | |
90 | } | |
91 | } | |
92 | ||
43e5396b DG |
93 | public void init(LTTngLogHandler handler) throws InterruptedException { |
94 | this.handler = handler; | |
95 | ||
96 | for (;;) { | |
97 | if (this.quit) { | |
98 | break; | |
99 | } | |
100 | ||
87d64abb DG |
101 | /* Cleanup Agent state before trying to connect or reconnect. */ |
102 | cleanupState(); | |
103 | ||
43e5396b DG |
104 | try { |
105 | ||
106 | /* | |
107 | * Connect to the session daemon before anything else. | |
108 | */ | |
109 | connectToSessiond(); | |
110 | ||
111 | /* | |
112 | * Register to the session daemon as the Java component of the | |
113 | * UST application. | |
114 | */ | |
115 | registerToSessiond(); | |
43e5396b | 116 | |
43e5396b DG |
117 | /* |
118 | * Block on socket receive and wait for command from the | |
119 | * session daemon. This will return if and only if there is a | |
120 | * fatal error or the socket closes. | |
121 | */ | |
122 | handleSessiondCmd(); | |
123 | } catch (UnknownHostException uhe) { | |
f1fa0535 | 124 | tryReleaseSem(); |
43e5396b DG |
125 | System.out.println(uhe); |
126 | } catch (IOException ioe) { | |
f1fa0535 | 127 | tryReleaseSem(); |
43e5396b DG |
128 | Thread.sleep(3000); |
129 | } catch (Exception e) { | |
f1fa0535 | 130 | tryReleaseSem(); |
43e5396b DG |
131 | e.printStackTrace(); |
132 | } | |
133 | } | |
134 | } | |
135 | ||
136 | public void destroy() { | |
137 | this.quit = true; | |
43e5396b DG |
138 | |
139 | try { | |
140 | if (this.sessiondSock != null) { | |
141 | this.sessiondSock.close(); | |
142 | } | |
143 | } catch (Exception e) { | |
144 | e.printStackTrace(); | |
145 | } | |
146 | } | |
147 | ||
148 | /* | |
149 | * Receive header data from the session daemon using the LTTng command | |
150 | * static buffer of the right size. | |
151 | */ | |
152 | private void recvHeader() throws Exception { | |
153 | int read_len; | |
154 | byte data[] = new byte[this.headerCmd.SIZE]; | |
155 | ||
156 | read_len = this.inFromSessiond.read(data, 0, data.length); | |
157 | if (read_len != data.length) { | |
158 | throw new IOException(); | |
159 | } | |
160 | this.headerCmd.populate(data); | |
161 | } | |
162 | ||
163 | /* | |
164 | * Receive payload from the session daemon. This MUST be done after a | |
165 | * recvHeader() so the header value of a command are known. | |
166 | * | |
167 | * The caller SHOULD use isPayload() before which returns true if a payload | |
168 | * is expected after the header. | |
169 | */ | |
170 | private byte[] recvPayload() throws Exception { | |
171 | byte payload[] = new byte[(int) this.headerCmd.data_size]; | |
172 | ||
173 | /* Failsafe check so we don't waste our time reading 0 bytes. */ | |
174 | if (payload.length == 0) { | |
175 | return null; | |
176 | } | |
177 | ||
178 | this.inFromSessiond.read(payload, 0, payload.length); | |
179 | return payload; | |
180 | } | |
181 | ||
182 | /* | |
183 | * Handle session command from the session daemon. | |
184 | */ | |
185 | private void handleSessiondCmd() throws Exception { | |
186 | int ret_code; | |
187 | byte data[] = null; | |
188 | ||
189 | while (true) { | |
190 | /* Get header from session daemon. */ | |
191 | recvHeader(); | |
192 | ||
193 | if (headerCmd.data_size > 0) { | |
194 | data = recvPayload(); | |
195 | } | |
196 | ||
197 | switch (headerCmd.cmd) { | |
f08bb871 DG |
198 | case CMD_REG_DONE: |
199 | { | |
200 | /* | |
201 | * Release semaphore so meaning registration is done and we | |
202 | * can proceed to continue tracing. | |
203 | */ | |
f1fa0535 | 204 | tryReleaseSem(); |
9aabed2d DG |
205 | /* |
206 | * We don't send any reply to the registration done command. | |
207 | * This just marks the end of the initial session setup. | |
208 | */ | |
209 | continue; | |
f08bb871 | 210 | } |
43e5396b DG |
211 | case CMD_LIST: |
212 | { | |
213 | LTTngSessiondCmd2_4.sessiond_list_logger listLoggerCmd = | |
214 | new LTTngSessiondCmd2_4.sessiond_list_logger(); | |
215 | listLoggerCmd.execute(this.handler); | |
216 | data = listLoggerCmd.getBytes(); | |
217 | break; | |
218 | } | |
219 | case CMD_ENABLE: | |
220 | { | |
5b5ffa03 | 221 | LTTngEvent event; |
43e5396b DG |
222 | LTTngSessiondCmd2_4.sessiond_enable_handler enableCmd = |
223 | new LTTngSessiondCmd2_4.sessiond_enable_handler(); | |
224 | if (data == null) { | |
225 | enableCmd.code = LTTngSessiondCmd2_4.lttng_jul_ret_code.CODE_INVALID_CMD; | |
226 | break; | |
227 | } | |
228 | enableCmd.populate(data); | |
9663e532 | 229 | enableCmd.execute(this.handler); |
43e5396b DG |
230 | data = enableCmd.getBytes(); |
231 | break; | |
232 | } | |
233 | case CMD_DISABLE: | |
234 | { | |
235 | LTTngSessiondCmd2_4.sessiond_disable_handler disableCmd = | |
236 | new LTTngSessiondCmd2_4.sessiond_disable_handler(); | |
237 | if (data == null) { | |
238 | disableCmd.code = LTTngSessiondCmd2_4.lttng_jul_ret_code.CODE_INVALID_CMD; | |
239 | break; | |
240 | } | |
241 | disableCmd.populate(data); | |
9663e532 | 242 | disableCmd.execute(this.handler); |
43e5396b DG |
243 | data = disableCmd.getBytes(); |
244 | break; | |
245 | } | |
246 | default: | |
247 | { | |
248 | data = new byte[4]; | |
249 | ByteBuffer buf = ByteBuffer.wrap(data); | |
250 | buf.order(ByteOrder.BIG_ENDIAN); | |
251 | LTTngSessiondCmd2_4.lttng_jul_ret_code code = | |
252 | LTTngSessiondCmd2_4.lttng_jul_ret_code.CODE_INVALID_CMD; | |
253 | buf.putInt(code.getCode()); | |
254 | break; | |
255 | } | |
256 | } | |
257 | ||
258 | /* Send payload to session daemon. */ | |
259 | this.outToSessiond.write(data, 0, data.length); | |
260 | this.outToSessiond.flush(); | |
261 | } | |
262 | } | |
263 | ||
f1fa0535 DG |
264 | private String getHomePath() { |
265 | return System.getProperty("user.home"); | |
266 | } | |
267 | ||
268 | /** | |
269 | * Read port number from file created by the session daemon. | |
270 | * | |
271 | * @return port value if found else 0. | |
272 | */ | |
273 | private int getPortFromFile(String path) throws IOException { | |
274 | int port; | |
275 | BufferedReader br; | |
276 | ||
277 | try { | |
278 | br = new BufferedReader(new FileReader(path)); | |
279 | String line = br.readLine(); | |
280 | port = Integer.parseInt(line, 10); | |
281 | if (port < 0 || port > 65535) { | |
282 | /* Invalid value. Ignore. */ | |
283 | port = 0; | |
284 | } | |
285 | br.close(); | |
286 | } catch (FileNotFoundException e) { | |
287 | /* No port available. */ | |
288 | port = 0; | |
289 | } | |
290 | ||
291 | return port; | |
292 | } | |
293 | ||
43e5396b | 294 | private void connectToSessiond() throws Exception { |
f1fa0535 DG |
295 | int port; |
296 | ||
297 | if (this.handler.is_root == 1) { | |
298 | port = getPortFromFile(rootPortFile); | |
299 | if (port == 0) { | |
300 | /* No session daemon available. Stop and retry later. */ | |
301 | throw new IOException(); | |
302 | } | |
303 | } else { | |
304 | port = getPortFromFile(getHomePath() + userPortFile); | |
305 | if (port == 0) { | |
306 | /* No session daemon available. Stop and retry later. */ | |
307 | throw new IOException(); | |
308 | } | |
309 | } | |
310 | ||
311 | this.sessiondSock = new Socket(this.sessiondHost, port); | |
43e5396b DG |
312 | this.inFromSessiond = new DataInputStream( |
313 | sessiondSock.getInputStream()); | |
314 | this.outToSessiond = new DataOutputStream( | |
315 | sessiondSock.getOutputStream()); | |
316 | } | |
317 | ||
318 | private void registerToSessiond() throws Exception { | |
2b8f5235 | 319 | byte data[] = new byte[8]; |
43e5396b DG |
320 | ByteBuffer buf = ByteBuffer.wrap(data); |
321 | String pid = ManagementFactory.getRuntimeMXBean().getName().split("@")[0]; | |
322 | ||
2b8f5235 | 323 | buf.putInt(this.agent_domain); |
43e5396b DG |
324 | buf.putInt(Integer.parseInt(pid)); |
325 | this.outToSessiond.write(data, 0, data.length); | |
326 | this.outToSessiond.flush(); | |
327 | } | |
328 | } |