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ef63833d LP |
1 | /*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ |
2 | ||
3 | /*** | |
4 | This file is part of systemd. | |
5 | ||
6 | Copyright 2011 Lennart Poettering | |
7 | ||
8 | systemd is free software; you can redistribute it and/or modify it | |
9 | under the terms of the GNU Lesser General Public License as published by | |
10 | the Free Software Foundation; either version 2.1 of the License, or | |
11 | (at your option) any later version. | |
12 | ||
13 | systemd is distributed in the hope that it will be useful, but | |
14 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | Lesser General Public License for more details. | |
17 | ||
18 | You should have received a copy of the GNU Lesser General Public License | |
19 | along with systemd; If not, see <http://www.gnu.org/licenses/>. | |
20 | ***/ | |
21 | ||
ef63833d | 22 | #include <fcntl.h> |
4f5dd394 | 23 | #include <sys/epoll.h> |
ef63833d | 24 | #include <sys/mman.h> |
4871690d | 25 | #include <sys/socket.h> |
4f5dd394 | 26 | #include <unistd.h> |
ef63833d | 27 | |
4f5dd394 LP |
28 | #include "libudev.h" |
29 | #include "sd-messages.h" | |
ef63833d | 30 | |
4f5dd394 LP |
31 | #include "escape.h" |
32 | #include "formats-util.h" | |
d025f1e4 | 33 | #include "journald-server.h" |
35e2e347 | 34 | #include "journald-syslog.h" |
0b452006 | 35 | #include "process-util.h" |
07630cea | 36 | #include "string-util.h" |
4f5dd394 | 37 | #include "journald-kmsg.h" |
ef63833d LP |
38 | |
39 | void server_forward_kmsg( | |
40 | Server *s, | |
41 | int priority, | |
42 | const char *identifier, | |
43 | const char *message, | |
3b3154df | 44 | const struct ucred *ucred) { |
ef63833d LP |
45 | |
46 | struct iovec iovec[5]; | |
3b97fcbd | 47 | char header_priority[DECIMAL_STR_MAX(priority) + 3], |
5ffa8c81 | 48 | header_pid[sizeof("[]: ")-1 + DECIMAL_STR_MAX(pid_t) + 1]; |
ef63833d LP |
49 | int n = 0; |
50 | char *ident_buf = NULL; | |
51 | ||
52 | assert(s); | |
53 | assert(priority >= 0); | |
54 | assert(priority <= 999); | |
55 | assert(message); | |
56 | ||
57 | if (_unlikely_(LOG_PRI(priority) > s->max_level_kmsg)) | |
58 | return; | |
59 | ||
60 | if (_unlikely_(s->dev_kmsg_fd < 0)) | |
61 | return; | |
62 | ||
63 | /* Never allow messages with kernel facility to be written to | |
64 | * kmsg, regardless where the data comes from. */ | |
65 | priority = syslog_fixup_facility(priority); | |
66 | ||
67 | /* First: priority field */ | |
5ffa8c81 | 68 | xsprintf(header_priority, "<%i>", priority); |
ef63833d LP |
69 | IOVEC_SET_STRING(iovec[n++], header_priority); |
70 | ||
71 | /* Second: identifier and PID */ | |
72 | if (ucred) { | |
73 | if (!identifier) { | |
74 | get_process_comm(ucred->pid, &ident_buf); | |
75 | identifier = ident_buf; | |
76 | } | |
77 | ||
5ffa8c81 | 78 | xsprintf(header_pid, "["PID_FMT"]: ", ucred->pid); |
ef63833d LP |
79 | |
80 | if (identifier) | |
81 | IOVEC_SET_STRING(iovec[n++], identifier); | |
82 | ||
83 | IOVEC_SET_STRING(iovec[n++], header_pid); | |
84 | } else if (identifier) { | |
85 | IOVEC_SET_STRING(iovec[n++], identifier); | |
86 | IOVEC_SET_STRING(iovec[n++], ": "); | |
87 | } | |
88 | ||
89 | /* Fourth: message */ | |
90 | IOVEC_SET_STRING(iovec[n++], message); | |
91 | IOVEC_SET_STRING(iovec[n++], "\n"); | |
92 | ||
93 | if (writev(s->dev_kmsg_fd, iovec, n) < 0) | |
56f64d95 | 94 | log_debug_errno(errno, "Failed to write to /dev/kmsg for logging: %m"); |
ef63833d LP |
95 | |
96 | free(ident_buf); | |
97 | } | |
98 | ||
99 | static bool is_us(const char *pid) { | |
100 | pid_t t; | |
101 | ||
102 | assert(pid); | |
103 | ||
104 | if (parse_pid(pid, &t) < 0) | |
105 | return false; | |
106 | ||
107 | return t == getpid(); | |
108 | } | |
109 | ||
3b3154df | 110 | static void dev_kmsg_record(Server *s, const char *p, size_t l) { |
ef63833d LP |
111 | struct iovec iovec[N_IOVEC_META_FIELDS + 7 + N_IOVEC_KERNEL_FIELDS + 2 + N_IOVEC_UDEV_FIELDS]; |
112 | char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL; | |
113 | int priority, r; | |
114 | unsigned n = 0, z = 0, j; | |
e9f600f2 | 115 | unsigned long long usec; |
ef63833d LP |
116 | char *identifier = NULL, *pid = NULL, *e, *f, *k; |
117 | uint64_t serial; | |
118 | size_t pl; | |
119 | char *kernel_device = NULL; | |
120 | ||
121 | assert(s); | |
122 | assert(p); | |
123 | ||
124 | if (l <= 0) | |
125 | return; | |
126 | ||
127 | e = memchr(p, ',', l); | |
128 | if (!e) | |
129 | return; | |
130 | *e = 0; | |
131 | ||
132 | r = safe_atoi(p, &priority); | |
133 | if (r < 0 || priority < 0 || priority > 999) | |
134 | return; | |
135 | ||
136 | if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN) | |
137 | return; | |
138 | ||
139 | l -= (e - p) + 1; | |
140 | p = e + 1; | |
141 | e = memchr(p, ',', l); | |
142 | if (!e) | |
143 | return; | |
144 | *e = 0; | |
145 | ||
146 | r = safe_atou64(p, &serial); | |
147 | if (r < 0) | |
148 | return; | |
149 | ||
150 | if (s->kernel_seqnum) { | |
151 | /* We already read this one? */ | |
152 | if (serial < *s->kernel_seqnum) | |
153 | return; | |
154 | ||
155 | /* Did we lose any? */ | |
156 | if (serial > *s->kernel_seqnum) | |
507f22bd | 157 | server_driver_message(s, SD_MESSAGE_JOURNAL_MISSED, "Missed %"PRIu64" kernel messages", |
b9c488f6 | 158 | serial - *s->kernel_seqnum); |
ef63833d LP |
159 | |
160 | /* Make sure we never read this one again. Note that | |
161 | * we always store the next message serial we expect | |
162 | * here, simply because this makes handling the first | |
163 | * message with serial 0 easy. */ | |
164 | *s->kernel_seqnum = serial + 1; | |
165 | } | |
166 | ||
167 | l -= (e - p) + 1; | |
168 | p = e + 1; | |
169 | f = memchr(p, ';', l); | |
170 | if (!f) | |
171 | return; | |
172 | /* Kernel 3.6 has the flags field, kernel 3.5 lacks that */ | |
173 | e = memchr(p, ',', l); | |
174 | if (!e || f < e) | |
175 | e = f; | |
176 | *e = 0; | |
177 | ||
e9f600f2 | 178 | r = safe_atollu(p, &usec); |
ef63833d LP |
179 | if (r < 0) |
180 | return; | |
181 | ||
182 | l -= (f - p) + 1; | |
183 | p = f + 1; | |
184 | e = memchr(p, '\n', l); | |
185 | if (!e) | |
186 | return; | |
187 | *e = 0; | |
188 | ||
189 | pl = e - p; | |
190 | l -= (e - p) + 1; | |
191 | k = e + 1; | |
192 | ||
193 | for (j = 0; l > 0 && j < N_IOVEC_KERNEL_FIELDS; j++) { | |
194 | char *m; | |
dc61b7e4 | 195 | /* Metadata fields attached */ |
ef63833d LP |
196 | |
197 | if (*k != ' ') | |
198 | break; | |
199 | ||
200 | k ++, l --; | |
201 | ||
202 | e = memchr(k, '\n', l); | |
203 | if (!e) | |
204 | return; | |
205 | ||
206 | *e = 0; | |
207 | ||
527b7a42 | 208 | if (cunescape_length_with_prefix(k, e - k, "_KERNEL_", UNESCAPE_RELAX, &m) < 0) |
ef63833d LP |
209 | break; |
210 | ||
211 | if (startswith(m, "_KERNEL_DEVICE=")) | |
212 | kernel_device = m + 15; | |
213 | ||
214 | IOVEC_SET_STRING(iovec[n++], m); | |
215 | z++; | |
216 | ||
217 | l -= (e - k) + 1; | |
218 | k = e + 1; | |
219 | } | |
220 | ||
221 | if (kernel_device) { | |
222 | struct udev_device *ud; | |
223 | ||
224 | ud = udev_device_new_from_device_id(s->udev, kernel_device); | |
225 | if (ud) { | |
226 | const char *g; | |
227 | struct udev_list_entry *ll; | |
228 | char *b; | |
229 | ||
230 | g = udev_device_get_devnode(ud); | |
231 | if (g) { | |
232 | b = strappend("_UDEV_DEVNODE=", g); | |
233 | if (b) { | |
234 | IOVEC_SET_STRING(iovec[n++], b); | |
235 | z++; | |
236 | } | |
237 | } | |
238 | ||
239 | g = udev_device_get_sysname(ud); | |
240 | if (g) { | |
241 | b = strappend("_UDEV_SYSNAME=", g); | |
242 | if (b) { | |
243 | IOVEC_SET_STRING(iovec[n++], b); | |
244 | z++; | |
245 | } | |
246 | } | |
247 | ||
248 | j = 0; | |
249 | ll = udev_device_get_devlinks_list_entry(ud); | |
250 | udev_list_entry_foreach(ll, ll) { | |
251 | ||
252 | if (j > N_IOVEC_UDEV_FIELDS) | |
253 | break; | |
254 | ||
255 | g = udev_list_entry_get_name(ll); | |
ef63833d | 256 | if (g) { |
4b94f3b8 ZJS |
257 | b = strappend("_UDEV_DEVLINK=", g); |
258 | if (b) { | |
259 | IOVEC_SET_STRING(iovec[n++], b); | |
260 | z++; | |
261 | } | |
ef63833d LP |
262 | } |
263 | ||
264 | j++; | |
265 | } | |
266 | ||
267 | udev_device_unref(ud); | |
268 | } | |
269 | } | |
270 | ||
e9f600f2 | 271 | if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", usec) >= 0) |
ef63833d LP |
272 | IOVEC_SET_STRING(iovec[n++], source_time); |
273 | ||
274 | IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel"); | |
275 | ||
276 | if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) | |
277 | IOVEC_SET_STRING(iovec[n++], syslog_priority); | |
278 | ||
36dd072c MS |
279 | if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) |
280 | IOVEC_SET_STRING(iovec[n++], syslog_facility); | |
281 | ||
ef63833d LP |
282 | if ((priority & LOG_FACMASK) == LOG_KERN) |
283 | IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel"); | |
284 | else { | |
e88baee8 | 285 | pl -= syslog_parse_identifier((const char**) &p, &identifier, &pid); |
ef63833d LP |
286 | |
287 | /* Avoid any messages we generated ourselves via | |
288 | * log_info() and friends. */ | |
289 | if (pid && is_us(pid)) | |
290 | goto finish; | |
291 | ||
292 | if (identifier) { | |
293 | syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); | |
294 | if (syslog_identifier) | |
295 | IOVEC_SET_STRING(iovec[n++], syslog_identifier); | |
296 | } | |
297 | ||
298 | if (pid) { | |
299 | syslog_pid = strappend("SYSLOG_PID=", pid); | |
300 | if (syslog_pid) | |
301 | IOVEC_SET_STRING(iovec[n++], syslog_pid); | |
302 | } | |
ef63833d LP |
303 | } |
304 | ||
527b7a42 | 305 | if (cunescape_length_with_prefix(p, pl, "MESSAGE=", UNESCAPE_RELAX, &message) >= 0) |
ef63833d LP |
306 | IOVEC_SET_STRING(iovec[n++], message); |
307 | ||
968f3196 | 308 | server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority, 0); |
ef63833d LP |
309 | |
310 | finish: | |
311 | for (j = 0; j < z; j++) | |
312 | free(iovec[j].iov_base); | |
313 | ||
314 | free(message); | |
315 | free(syslog_priority); | |
316 | free(syslog_identifier); | |
317 | free(syslog_pid); | |
318 | free(syslog_facility); | |
319 | free(source_time); | |
320 | free(identifier); | |
321 | free(pid); | |
322 | } | |
323 | ||
f9a810be | 324 | static int server_read_dev_kmsg(Server *s) { |
ef63833d LP |
325 | char buffer[8192+1]; /* the kernel-side limit per record is 8K currently */ |
326 | ssize_t l; | |
327 | ||
328 | assert(s); | |
329 | assert(s->dev_kmsg_fd >= 0); | |
330 | ||
331 | l = read(s->dev_kmsg_fd, buffer, sizeof(buffer) - 1); | |
332 | if (l == 0) | |
333 | return 0; | |
334 | if (l < 0) { | |
335 | /* Old kernels who don't allow reading from /dev/kmsg | |
336 | * return EINVAL when we try. So handle this cleanly, | |
337 | * but don' try to ever read from it again. */ | |
338 | if (errno == EINVAL) { | |
f9a810be | 339 | s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source); |
ef63833d LP |
340 | return 0; |
341 | } | |
342 | ||
343 | if (errno == EAGAIN || errno == EINTR || errno == EPIPE) | |
344 | return 0; | |
345 | ||
56f64d95 | 346 | log_error_errno(errno, "Failed to read from kernel: %m"); |
ef63833d LP |
347 | return -errno; |
348 | } | |
349 | ||
350 | dev_kmsg_record(s, buffer, l); | |
351 | return 1; | |
352 | } | |
353 | ||
354 | int server_flush_dev_kmsg(Server *s) { | |
355 | int r; | |
356 | ||
357 | assert(s); | |
358 | ||
359 | if (s->dev_kmsg_fd < 0) | |
360 | return 0; | |
361 | ||
362 | if (!s->dev_kmsg_readable) | |
363 | return 0; | |
364 | ||
2b43f939 | 365 | log_debug("Flushing /dev/kmsg..."); |
ef63833d LP |
366 | |
367 | for (;;) { | |
368 | r = server_read_dev_kmsg(s); | |
369 | if (r < 0) | |
370 | return r; | |
371 | ||
372 | if (r == 0) | |
373 | break; | |
374 | } | |
375 | ||
376 | return 0; | |
377 | } | |
378 | ||
f9a810be LP |
379 | static int dispatch_dev_kmsg(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
380 | Server *s = userdata; | |
381 | ||
382 | assert(es); | |
383 | assert(fd == s->dev_kmsg_fd); | |
384 | assert(s); | |
385 | ||
386 | if (revents & EPOLLERR) | |
387 | log_warning("/dev/kmsg buffer overrun, some messages lost."); | |
388 | ||
389 | if (!(revents & EPOLLIN)) | |
390 | log_error("Got invalid event from epoll for /dev/kmsg: %"PRIx32, revents); | |
391 | ||
392 | return server_read_dev_kmsg(s); | |
393 | } | |
394 | ||
ef63833d | 395 | int server_open_dev_kmsg(Server *s) { |
f9a810be | 396 | int r; |
ef63833d LP |
397 | |
398 | assert(s); | |
399 | ||
400 | s->dev_kmsg_fd = open("/dev/kmsg", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
401 | if (s->dev_kmsg_fd < 0) { | |
445ea9be LP |
402 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, |
403 | "Failed to open /dev/kmsg, ignoring: %m"); | |
ef63833d LP |
404 | return 0; |
405 | } | |
406 | ||
151b9b96 | 407 | r = sd_event_add_io(s->event, &s->dev_kmsg_event_source, s->dev_kmsg_fd, EPOLLIN, dispatch_dev_kmsg, s); |
f9a810be | 408 | if (r < 0) { |
ef63833d LP |
409 | |
410 | /* This will fail with EPERM on older kernels where | |
411 | * /dev/kmsg is not readable. */ | |
c0f71f46 LP |
412 | if (r == -EPERM) { |
413 | r = 0; | |
414 | goto fail; | |
415 | } | |
ef63833d | 416 | |
da927ba9 | 417 | log_error_errno(r, "Failed to add /dev/kmsg fd to event loop: %m"); |
c0f71f46 | 418 | goto fail; |
f9a810be LP |
419 | } |
420 | ||
421 | r = sd_event_source_set_priority(s->dev_kmsg_event_source, SD_EVENT_PRIORITY_IMPORTANT+10); | |
422 | if (r < 0) { | |
da927ba9 | 423 | log_error_errno(r, "Failed to adjust priority of kmsg event source: %m"); |
c0f71f46 | 424 | goto fail; |
ef63833d LP |
425 | } |
426 | ||
427 | s->dev_kmsg_readable = true; | |
428 | ||
429 | return 0; | |
c0f71f46 LP |
430 | |
431 | fail: | |
03e334a1 LP |
432 | s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source); |
433 | s->dev_kmsg_fd = safe_close(s->dev_kmsg_fd); | |
c0f71f46 LP |
434 | |
435 | return r; | |
ef63833d LP |
436 | } |
437 | ||
438 | int server_open_kernel_seqnum(Server *s) { | |
03e334a1 | 439 | _cleanup_close_ int fd; |
ef63833d LP |
440 | uint64_t *p; |
441 | ||
442 | assert(s); | |
443 | ||
444 | /* We store the seqnum we last read in an mmaped file. That | |
445 | * way we can just use it like a variable, but it is | |
b2e6df73 | 446 | * persistent and automatically flushed at reboot. */ |
ef63833d LP |
447 | |
448 | fd = open("/run/systemd/journal/kernel-seqnum", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); | |
449 | if (fd < 0) { | |
56f64d95 | 450 | log_error_errno(errno, "Failed to open /run/systemd/journal/kernel-seqnum, ignoring: %m"); |
ef63833d LP |
451 | return 0; |
452 | } | |
453 | ||
454 | if (posix_fallocate(fd, 0, sizeof(uint64_t)) < 0) { | |
56f64d95 | 455 | log_error_errno(errno, "Failed to allocate sequential number file, ignoring: %m"); |
ef63833d LP |
456 | return 0; |
457 | } | |
458 | ||
459 | p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
460 | if (p == MAP_FAILED) { | |
56f64d95 | 461 | log_error_errno(errno, "Failed to map sequential number file, ignoring: %m"); |
ef63833d LP |
462 | return 0; |
463 | } | |
464 | ||
ef63833d LP |
465 | s->kernel_seqnum = p; |
466 | ||
467 | return 0; | |
468 | } |