Mercurial > hg > truffle
annotate src/os/linux/vm/attachListener_linux.cpp @ 17806:9200402b42d5
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Reviewed-by: kvn
author | simonis |
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date | Thu, 20 Feb 2014 14:44:33 +0100 |
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0 | 1 /* |
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2 * Copyright (c) 2005, 2013, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "runtime/interfaceSupport.hpp" | |
27 #include "runtime/os.hpp" | |
28 #include "services/attachListener.hpp" | |
29 #include "services/dtraceAttacher.hpp" | |
0 | 30 |
31 #include <unistd.h> | |
32 #include <signal.h> | |
33 #include <sys/types.h> | |
34 #include <sys/socket.h> | |
35 #include <sys/un.h> | |
36 #include <sys/stat.h> | |
37 | |
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38 #ifndef UNIX_PATH_MAX |
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39 #define UNIX_PATH_MAX sizeof(((struct sockaddr_un *)0)->sun_path) |
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40 #endif |
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41 |
0 | 42 // The attach mechanism on Linux uses a UNIX domain socket. An attach listener |
43 // thread is created at startup or is created on-demand via a signal from | |
44 // the client tool. The attach listener creates a socket and binds it to a file | |
45 // in the filesystem. The attach listener then acts as a simple (single- | |
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46 // threaded) server - it waits for a client to connect, reads the request, |
0 | 47 // executes it, and returns the response to the client via the socket |
48 // connection. | |
49 // | |
50 // As the socket is a UNIX domain socket it means that only clients on the | |
51 // local machine can connect. In addition there are two other aspects to | |
52 // the security: | |
53 // 1. The well known file that the socket is bound to has permission 400 | |
54 // 2. When a client connect, the SO_PEERCRED socket option is used to | |
55 // obtain the credentials of client. We check that the effective uid | |
56 // of the client matches this process. | |
57 | |
58 // forward reference | |
59 class LinuxAttachOperation; | |
60 | |
61 class LinuxAttachListener: AllStatic { | |
62 private: | |
63 // the path to which we bind the UNIX domain socket | |
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64 static char _path[UNIX_PATH_MAX]; |
0 | 65 static bool _has_path; |
66 | |
67 // the file descriptor for the listening socket | |
68 static int _listener; | |
69 | |
70 static void set_path(char* path) { | |
71 if (path == NULL) { | |
72 _has_path = false; | |
73 } else { | |
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74 strncpy(_path, path, UNIX_PATH_MAX); |
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75 _path[UNIX_PATH_MAX-1] = '\0'; |
0 | 76 _has_path = true; |
77 } | |
78 } | |
79 | |
80 static void set_listener(int s) { _listener = s; } | |
81 | |
82 // reads a request from the given connected socket | |
83 static LinuxAttachOperation* read_request(int s); | |
84 | |
85 public: | |
86 enum { | |
87 ATTACH_PROTOCOL_VER = 1 // protocol version | |
88 }; | |
89 enum { | |
90 ATTACH_ERROR_BADVERSION = 101 // error codes | |
91 }; | |
92 | |
93 // initialize the listener, returns 0 if okay | |
94 static int init(); | |
95 | |
96 static char* path() { return _path; } | |
97 static bool has_path() { return _has_path; } | |
98 static int listener() { return _listener; } | |
99 | |
100 // write the given buffer to a socket | |
101 static int write_fully(int s, char* buf, int len); | |
102 | |
103 static LinuxAttachOperation* dequeue(); | |
104 }; | |
105 | |
106 class LinuxAttachOperation: public AttachOperation { | |
107 private: | |
108 // the connection to the client | |
109 int _socket; | |
110 | |
111 public: | |
112 void complete(jint res, bufferedStream* st); | |
113 | |
114 void set_socket(int s) { _socket = s; } | |
115 int socket() const { return _socket; } | |
116 | |
117 LinuxAttachOperation(char* name) : AttachOperation(name) { | |
118 set_socket(-1); | |
119 } | |
120 }; | |
121 | |
122 // statics | |
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123 char LinuxAttachListener::_path[UNIX_PATH_MAX]; |
0 | 124 bool LinuxAttachListener::_has_path; |
125 int LinuxAttachListener::_listener = -1; | |
126 | |
127 // Supporting class to help split a buffer into individual components | |
128 class ArgumentIterator : public StackObj { | |
129 private: | |
130 char* _pos; | |
131 char* _end; | |
132 public: | |
133 ArgumentIterator(char* arg_buffer, size_t arg_size) { | |
134 _pos = arg_buffer; | |
135 _end = _pos + arg_size - 1; | |
136 } | |
137 char* next() { | |
138 if (*_pos == '\0') { | |
139 return NULL; | |
140 } | |
141 char* res = _pos; | |
142 char* next_pos = strchr(_pos, '\0'); | |
143 if (next_pos < _end) { | |
144 next_pos++; | |
145 } | |
146 _pos = next_pos; | |
147 return res; | |
148 } | |
149 }; | |
150 | |
151 | |
152 // atexit hook to stop listener and unlink the file that it is | |
153 // bound too. | |
154 extern "C" { | |
155 static void listener_cleanup() { | |
156 static int cleanup_done; | |
157 if (!cleanup_done) { | |
158 cleanup_done = 1; | |
159 int s = LinuxAttachListener::listener(); | |
160 if (s != -1) { | |
161 ::close(s); | |
162 } | |
163 if (LinuxAttachListener::has_path()) { | |
164 ::unlink(LinuxAttachListener::path()); | |
165 } | |
166 } | |
167 } | |
168 } | |
169 | |
170 // Initialization - create a listener socket and bind it to a file | |
171 | |
172 int LinuxAttachListener::init() { | |
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173 char path[UNIX_PATH_MAX]; // socket file |
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174 char initial_path[UNIX_PATH_MAX]; // socket file during setup |
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175 int listener; // listener socket (file descriptor) |
0 | 176 |
177 // register function to cleanup | |
178 ::atexit(listener_cleanup); | |
179 | |
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180 int n = snprintf(path, UNIX_PATH_MAX, "%s/.java_pid%d", |
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181 os::get_temp_directory(), os::current_process_id()); |
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182 if (n < (int)UNIX_PATH_MAX) { |
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183 n = snprintf(initial_path, UNIX_PATH_MAX, "%s.tmp", path); |
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184 } |
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185 if (n >= (int)UNIX_PATH_MAX) { |
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186 return -1; |
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187 } |
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188 |
0 | 189 // create the listener socket |
190 listener = ::socket(PF_UNIX, SOCK_STREAM, 0); | |
191 if (listener == -1) { | |
192 return -1; | |
193 } | |
194 | |
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195 // bind socket |
0 | 196 struct sockaddr_un addr; |
197 addr.sun_family = AF_UNIX; | |
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198 strcpy(addr.sun_path, initial_path); |
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199 ::unlink(initial_path); |
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200 int res = ::bind(listener, (struct sockaddr*)&addr, sizeof(addr)); |
0 | 201 if (res == -1) { |
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202 ::close(listener); |
0 | 203 return -1; |
204 } | |
205 | |
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206 // put in listen mode, set permissions, and rename into place |
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207 res = ::listen(listener, 5); |
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208 if (res == 0) { |
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209 RESTARTABLE(::chmod(initial_path, S_IREAD|S_IWRITE), res); |
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210 if (res == 0) { |
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211 res = ::rename(initial_path, path); |
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212 } |
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213 } |
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214 if (res == -1) { |
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215 ::close(listener); |
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216 ::unlink(initial_path); |
0 | 217 return -1; |
218 } | |
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219 set_path(path); |
0 | 220 set_listener(listener); |
221 | |
222 return 0; | |
223 } | |
224 | |
225 // Given a socket that is connected to a peer we read the request and | |
226 // create an AttachOperation. As the socket is blocking there is potential | |
227 // for a denial-of-service if the peer does not response. However this happens | |
228 // after the peer credentials have been checked and in the worst case it just | |
229 // means that the attach listener thread is blocked. | |
230 // | |
231 LinuxAttachOperation* LinuxAttachListener::read_request(int s) { | |
232 char ver_str[8]; | |
233 sprintf(ver_str, "%d", ATTACH_PROTOCOL_VER); | |
234 | |
235 // The request is a sequence of strings so we first figure out the | |
236 // expected count and the maximum possible length of the request. | |
237 // The request is: | |
238 // <ver>0<cmd>0<arg>0<arg>0<arg>0 | |
239 // where <ver> is the protocol version (1), <cmd> is the command | |
240 // name ("load", "datadump", ...), and <arg> is an argument | |
241 int expected_str_count = 2 + AttachOperation::arg_count_max; | |
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242 const int max_len = (sizeof(ver_str) + 1) + (AttachOperation::name_length_max + 1) + |
0 | 243 AttachOperation::arg_count_max*(AttachOperation::arg_length_max + 1); |
244 | |
245 char buf[max_len]; | |
246 int str_count = 0; | |
247 | |
248 // Read until all (expected) strings have been read, the buffer is | |
249 // full, or EOF. | |
250 | |
251 int off = 0; | |
252 int left = max_len; | |
253 | |
254 do { | |
255 int n; | |
256 RESTARTABLE(read(s, buf+off, left), n); | |
257 if (n == -1) { | |
258 return NULL; // reset by peer or other error | |
259 } | |
260 if (n == 0) { | |
261 break; | |
262 } | |
263 for (int i=0; i<n; i++) { | |
264 if (buf[off+i] == 0) { | |
265 // EOS found | |
266 str_count++; | |
267 | |
268 // The first string is <ver> so check it now to | |
269 // check for protocol mis-match | |
270 if (str_count == 1) { | |
271 if ((strlen(buf) != strlen(ver_str)) || | |
272 (atoi(buf) != ATTACH_PROTOCOL_VER)) { | |
273 char msg[32]; | |
274 sprintf(msg, "%d\n", ATTACH_ERROR_BADVERSION); | |
275 write_fully(s, msg, strlen(msg)); | |
276 return NULL; | |
277 } | |
278 } | |
279 } | |
280 } | |
281 off += n; | |
282 left -= n; | |
283 } while (left > 0 && str_count < expected_str_count); | |
284 | |
285 if (str_count != expected_str_count) { | |
286 return NULL; // incomplete request | |
287 } | |
288 | |
289 // parse request | |
290 | |
291 ArgumentIterator args(buf, (max_len)-left); | |
292 | |
293 // version already checked | |
294 char* v = args.next(); | |
295 | |
296 char* name = args.next(); | |
297 if (name == NULL || strlen(name) > AttachOperation::name_length_max) { | |
298 return NULL; | |
299 } | |
300 | |
301 LinuxAttachOperation* op = new LinuxAttachOperation(name); | |
302 | |
303 for (int i=0; i<AttachOperation::arg_count_max; i++) { | |
304 char* arg = args.next(); | |
305 if (arg == NULL) { | |
306 op->set_arg(i, NULL); | |
307 } else { | |
308 if (strlen(arg) > AttachOperation::arg_length_max) { | |
309 delete op; | |
310 return NULL; | |
311 } | |
312 op->set_arg(i, arg); | |
313 } | |
314 } | |
315 | |
316 op->set_socket(s); | |
317 return op; | |
318 } | |
319 | |
320 | |
321 // Dequeue an operation | |
322 // | |
323 // In the Linux implementation there is only a single operation and clients | |
324 // cannot queue commands (except at the socket level). | |
325 // | |
326 LinuxAttachOperation* LinuxAttachListener::dequeue() { | |
327 for (;;) { | |
328 int s; | |
329 | |
330 // wait for client to connect | |
331 struct sockaddr addr; | |
332 socklen_t len = sizeof(addr); | |
333 RESTARTABLE(::accept(listener(), &addr, &len), s); | |
334 if (s == -1) { | |
335 return NULL; // log a warning? | |
336 } | |
337 | |
338 // get the credentials of the peer and check the effective uid/guid | |
339 // - check with jeff on this. | |
340 struct ucred cred_info; | |
341 socklen_t optlen = sizeof(cred_info); | |
342 if (::getsockopt(s, SOL_SOCKET, SO_PEERCRED, (void*)&cred_info, &optlen) == -1) { | |
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343 ::close(s); |
0 | 344 continue; |
345 } | |
346 uid_t euid = geteuid(); | |
347 gid_t egid = getegid(); | |
348 | |
349 if (cred_info.uid != euid || cred_info.gid != egid) { | |
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350 ::close(s); |
0 | 351 continue; |
352 } | |
353 | |
354 // peer credential look okay so we read the request | |
355 LinuxAttachOperation* op = read_request(s); | |
356 if (op == NULL) { | |
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357 ::close(s); |
0 | 358 continue; |
359 } else { | |
360 return op; | |
361 } | |
362 } | |
363 } | |
364 | |
365 // write the given buffer to the socket | |
366 int LinuxAttachListener::write_fully(int s, char* buf, int len) { | |
367 do { | |
368 int n = ::write(s, buf, len); | |
369 if (n == -1) { | |
370 if (errno != EINTR) return -1; | |
371 } else { | |
372 buf += n; | |
373 len -= n; | |
374 } | |
375 } | |
376 while (len > 0); | |
377 return 0; | |
378 } | |
379 | |
380 // Complete an operation by sending the operation result and any result | |
381 // output to the client. At this time the socket is in blocking mode so | |
382 // potentially we can block if there is a lot of data and the client is | |
383 // non-responsive. For most operations this is a non-issue because the | |
384 // default send buffer is sufficient to buffer everything. In the future | |
385 // if there are operations that involves a very big reply then it the | |
386 // socket could be made non-blocking and a timeout could be used. | |
387 | |
388 void LinuxAttachOperation::complete(jint result, bufferedStream* st) { | |
389 JavaThread* thread = JavaThread::current(); | |
390 ThreadBlockInVM tbivm(thread); | |
391 | |
392 thread->set_suspend_equivalent(); | |
393 // cleared by handle_special_suspend_equivalent_condition() or | |
394 // java_suspend_self() via check_and_wait_while_suspended() | |
395 | |
396 // write operation result | |
397 char msg[32]; | |
398 sprintf(msg, "%d\n", result); | |
399 int rc = LinuxAttachListener::write_fully(this->socket(), msg, strlen(msg)); | |
400 | |
401 // write any result data | |
402 if (rc == 0) { | |
403 LinuxAttachListener::write_fully(this->socket(), (char*) st->base(), st->size()); | |
404 ::shutdown(this->socket(), 2); | |
405 } | |
406 | |
407 // done | |
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408 ::close(this->socket()); |
0 | 409 |
410 // were we externally suspended while we were waiting? | |
411 thread->check_and_wait_while_suspended(); | |
412 | |
413 delete this; | |
414 } | |
415 | |
416 | |
417 // AttachListener functions | |
418 | |
419 AttachOperation* AttachListener::dequeue() { | |
420 JavaThread* thread = JavaThread::current(); | |
421 ThreadBlockInVM tbivm(thread); | |
422 | |
423 thread->set_suspend_equivalent(); | |
424 // cleared by handle_special_suspend_equivalent_condition() or | |
425 // java_suspend_self() via check_and_wait_while_suspended() | |
426 | |
427 AttachOperation* op = LinuxAttachListener::dequeue(); | |
428 | |
429 // were we externally suspended while we were waiting? | |
430 thread->check_and_wait_while_suspended(); | |
431 | |
432 return op; | |
433 } | |
434 | |
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436 // Performs initialization at vm startup |
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437 // For Linux we remove any stale .java_pid file which could cause |
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438 // an attaching process to think we are ready to receive on the |
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439 // domain socket before we are properly initialized |
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440 |
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441 void AttachListener::vm_start() { |
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442 char fn[UNIX_PATH_MAX]; |
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443 struct stat64 st; |
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444 int ret; |
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445 |
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446 int n = snprintf(fn, UNIX_PATH_MAX, "%s/.java_pid%d", |
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447 os::get_temp_directory(), os::current_process_id()); |
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448 assert(n < (int)UNIX_PATH_MAX, "java_pid file name buffer overflow"); |
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449 |
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450 RESTARTABLE(::stat64(fn, &st), ret); |
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451 if (ret == 0) { |
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452 ret = ::unlink(fn); |
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453 if (ret == -1) { |
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454 debug_only(warning("failed to remove stale attach pid file at %s", fn)); |
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455 } |
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456 } |
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457 } |
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458 |
0 | 459 int AttachListener::pd_init() { |
460 JavaThread* thread = JavaThread::current(); | |
461 ThreadBlockInVM tbivm(thread); | |
462 | |
463 thread->set_suspend_equivalent(); | |
464 // cleared by handle_special_suspend_equivalent_condition() or | |
465 // java_suspend_self() via check_and_wait_while_suspended() | |
466 | |
467 int ret_code = LinuxAttachListener::init(); | |
468 | |
469 // were we externally suspended while we were waiting? | |
470 thread->check_and_wait_while_suspended(); | |
471 | |
472 return ret_code; | |
473 } | |
474 | |
475 // Attach Listener is started lazily except in the case when | |
476 // +ReduseSignalUsage is used | |
477 bool AttachListener::init_at_startup() { | |
478 if (ReduceSignalUsage) { | |
479 return true; | |
480 } else { | |
481 return false; | |
482 } | |
483 } | |
484 | |
485 // If the file .attach_pid<pid> exists in the working directory | |
486 // or /tmp then this is the trigger to start the attach mechanism | |
487 bool AttachListener::is_init_trigger() { | |
488 if (init_at_startup() || is_initialized()) { | |
489 return false; // initialized at startup or already initialized | |
490 } | |
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491 char fn[PATH_MAX+1]; |
0 | 492 sprintf(fn, ".attach_pid%d", os::current_process_id()); |
493 int ret; | |
494 struct stat64 st; | |
495 RESTARTABLE(::stat64(fn, &st), ret); | |
496 if (ret == -1) { | |
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497 snprintf(fn, sizeof(fn), "%s/.attach_pid%d", |
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498 os::get_temp_directory(), os::current_process_id()); |
0 | 499 RESTARTABLE(::stat64(fn, &st), ret); |
500 } | |
501 if (ret == 0) { | |
502 // simple check to avoid starting the attach mechanism when | |
503 // a bogus user creates the file | |
504 if (st.st_uid == geteuid()) { | |
505 init(); | |
506 return true; | |
507 } | |
508 } | |
509 return false; | |
510 } | |
511 | |
512 // if VM aborts then remove listener | |
513 void AttachListener::abort() { | |
514 listener_cleanup(); | |
515 } | |
516 | |
517 void AttachListener::pd_data_dump() { | |
518 os::signal_notify(SIGQUIT); | |
519 } | |
520 | |
521 AttachOperationFunctionInfo* AttachListener::pd_find_operation(const char* n) { | |
522 return NULL; | |
523 } | |
524 | |
525 jint AttachListener::pd_set_flag(AttachOperation* op, outputStream* out) { | |
526 out->print_cr("flag '%s' cannot be changed", op->arg(0)); | |
527 return JNI_ERR; | |
528 } | |
529 | |
530 void AttachListener::pd_detachall() { | |
531 // do nothing for now | |
532 } |