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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 | ||
22 | #include <unistd.h> | |
23 | #include <sys/epoll.h> | |
24 | #include <fcntl.h> | |
25 | #include <sys/mman.h> | |
4871690d | 26 | #include <sys/socket.h> |
ef63833d LP |
27 | |
28 | #include <systemd/sd-messages.h> | |
29 | #include <libudev.h> | |
30 | ||
d025f1e4 | 31 | #include "journald-server.h" |
ef63833d | 32 | #include "journald-kmsg.h" |
35e2e347 | 33 | #include "journald-syslog.h" |
ef63833d LP |
34 | |
35 | void server_forward_kmsg( | |
36 | Server *s, | |
37 | int priority, | |
38 | const char *identifier, | |
39 | const char *message, | |
40 | struct ucred *ucred) { | |
41 | ||
42 | struct iovec iovec[5]; | |
43 | char header_priority[6], header_pid[16]; | |
44 | int n = 0; | |
45 | char *ident_buf = NULL; | |
46 | ||
47 | assert(s); | |
48 | assert(priority >= 0); | |
49 | assert(priority <= 999); | |
50 | assert(message); | |
51 | ||
52 | if (_unlikely_(LOG_PRI(priority) > s->max_level_kmsg)) | |
53 | return; | |
54 | ||
55 | if (_unlikely_(s->dev_kmsg_fd < 0)) | |
56 | return; | |
57 | ||
58 | /* Never allow messages with kernel facility to be written to | |
59 | * kmsg, regardless where the data comes from. */ | |
60 | priority = syslog_fixup_facility(priority); | |
61 | ||
62 | /* First: priority field */ | |
63 | snprintf(header_priority, sizeof(header_priority), "<%i>", priority); | |
64 | char_array_0(header_priority); | |
65 | IOVEC_SET_STRING(iovec[n++], header_priority); | |
66 | ||
67 | /* Second: identifier and PID */ | |
68 | if (ucred) { | |
69 | if (!identifier) { | |
70 | get_process_comm(ucred->pid, &ident_buf); | |
71 | identifier = ident_buf; | |
72 | } | |
73 | ||
de0671ee | 74 | snprintf(header_pid, sizeof(header_pid), "["PID_FMT"]: ", ucred->pid); |
ef63833d LP |
75 | char_array_0(header_pid); |
76 | ||
77 | if (identifier) | |
78 | IOVEC_SET_STRING(iovec[n++], identifier); | |
79 | ||
80 | IOVEC_SET_STRING(iovec[n++], header_pid); | |
81 | } else if (identifier) { | |
82 | IOVEC_SET_STRING(iovec[n++], identifier); | |
83 | IOVEC_SET_STRING(iovec[n++], ": "); | |
84 | } | |
85 | ||
86 | /* Fourth: message */ | |
87 | IOVEC_SET_STRING(iovec[n++], message); | |
88 | IOVEC_SET_STRING(iovec[n++], "\n"); | |
89 | ||
90 | if (writev(s->dev_kmsg_fd, iovec, n) < 0) | |
f5f6d0e2 | 91 | log_debug("Failed to write to /dev/kmsg for logging: %m"); |
ef63833d LP |
92 | |
93 | free(ident_buf); | |
94 | } | |
95 | ||
96 | static bool is_us(const char *pid) { | |
97 | pid_t t; | |
98 | ||
99 | assert(pid); | |
100 | ||
101 | if (parse_pid(pid, &t) < 0) | |
102 | return false; | |
103 | ||
104 | return t == getpid(); | |
105 | } | |
106 | ||
107 | static void dev_kmsg_record(Server *s, char *p, size_t l) { | |
108 | struct iovec iovec[N_IOVEC_META_FIELDS + 7 + N_IOVEC_KERNEL_FIELDS + 2 + N_IOVEC_UDEV_FIELDS]; | |
109 | char *message = NULL, *syslog_priority = NULL, *syslog_pid = NULL, *syslog_facility = NULL, *syslog_identifier = NULL, *source_time = NULL; | |
110 | int priority, r; | |
111 | unsigned n = 0, z = 0, j; | |
e9f600f2 | 112 | unsigned long long usec; |
ef63833d LP |
113 | char *identifier = NULL, *pid = NULL, *e, *f, *k; |
114 | uint64_t serial; | |
115 | size_t pl; | |
116 | char *kernel_device = NULL; | |
117 | ||
118 | assert(s); | |
119 | assert(p); | |
120 | ||
121 | if (l <= 0) | |
122 | return; | |
123 | ||
124 | e = memchr(p, ',', l); | |
125 | if (!e) | |
126 | return; | |
127 | *e = 0; | |
128 | ||
129 | r = safe_atoi(p, &priority); | |
130 | if (r < 0 || priority < 0 || priority > 999) | |
131 | return; | |
132 | ||
133 | if (s->forward_to_kmsg && (priority & LOG_FACMASK) != LOG_KERN) | |
134 | return; | |
135 | ||
136 | l -= (e - p) + 1; | |
137 | p = e + 1; | |
138 | e = memchr(p, ',', l); | |
139 | if (!e) | |
140 | return; | |
141 | *e = 0; | |
142 | ||
143 | r = safe_atou64(p, &serial); | |
144 | if (r < 0) | |
145 | return; | |
146 | ||
147 | if (s->kernel_seqnum) { | |
148 | /* We already read this one? */ | |
149 | if (serial < *s->kernel_seqnum) | |
150 | return; | |
151 | ||
152 | /* Did we lose any? */ | |
153 | if (serial > *s->kernel_seqnum) | |
507f22bd ZJS |
154 | server_driver_message(s, SD_MESSAGE_JOURNAL_MISSED, "Missed %"PRIu64" kernel messages", |
155 | serial - *s->kernel_seqnum - 1); | |
ef63833d LP |
156 | |
157 | /* Make sure we never read this one again. Note that | |
158 | * we always store the next message serial we expect | |
159 | * here, simply because this makes handling the first | |
160 | * message with serial 0 easy. */ | |
161 | *s->kernel_seqnum = serial + 1; | |
162 | } | |
163 | ||
164 | l -= (e - p) + 1; | |
165 | p = e + 1; | |
166 | f = memchr(p, ';', l); | |
167 | if (!f) | |
168 | return; | |
169 | /* Kernel 3.6 has the flags field, kernel 3.5 lacks that */ | |
170 | e = memchr(p, ',', l); | |
171 | if (!e || f < e) | |
172 | e = f; | |
173 | *e = 0; | |
174 | ||
e9f600f2 | 175 | r = safe_atollu(p, &usec); |
ef63833d LP |
176 | if (r < 0) |
177 | return; | |
178 | ||
179 | l -= (f - p) + 1; | |
180 | p = f + 1; | |
181 | e = memchr(p, '\n', l); | |
182 | if (!e) | |
183 | return; | |
184 | *e = 0; | |
185 | ||
186 | pl = e - p; | |
187 | l -= (e - p) + 1; | |
188 | k = e + 1; | |
189 | ||
190 | for (j = 0; l > 0 && j < N_IOVEC_KERNEL_FIELDS; j++) { | |
191 | char *m; | |
192 | /* Meta data fields attached */ | |
193 | ||
194 | if (*k != ' ') | |
195 | break; | |
196 | ||
197 | k ++, l --; | |
198 | ||
199 | e = memchr(k, '\n', l); | |
200 | if (!e) | |
201 | return; | |
202 | ||
203 | *e = 0; | |
204 | ||
205 | m = cunescape_length_with_prefix(k, e - k, "_KERNEL_"); | |
206 | if (!m) | |
207 | break; | |
208 | ||
209 | if (startswith(m, "_KERNEL_DEVICE=")) | |
210 | kernel_device = m + 15; | |
211 | ||
212 | IOVEC_SET_STRING(iovec[n++], m); | |
213 | z++; | |
214 | ||
215 | l -= (e - k) + 1; | |
216 | k = e + 1; | |
217 | } | |
218 | ||
219 | if (kernel_device) { | |
220 | struct udev_device *ud; | |
221 | ||
222 | ud = udev_device_new_from_device_id(s->udev, kernel_device); | |
223 | if (ud) { | |
224 | const char *g; | |
225 | struct udev_list_entry *ll; | |
226 | char *b; | |
227 | ||
228 | g = udev_device_get_devnode(ud); | |
229 | if (g) { | |
230 | b = strappend("_UDEV_DEVNODE=", g); | |
231 | if (b) { | |
232 | IOVEC_SET_STRING(iovec[n++], b); | |
233 | z++; | |
234 | } | |
235 | } | |
236 | ||
237 | g = udev_device_get_sysname(ud); | |
238 | if (g) { | |
239 | b = strappend("_UDEV_SYSNAME=", g); | |
240 | if (b) { | |
241 | IOVEC_SET_STRING(iovec[n++], b); | |
242 | z++; | |
243 | } | |
244 | } | |
245 | ||
246 | j = 0; | |
247 | ll = udev_device_get_devlinks_list_entry(ud); | |
248 | udev_list_entry_foreach(ll, ll) { | |
249 | ||
250 | if (j > N_IOVEC_UDEV_FIELDS) | |
251 | break; | |
252 | ||
253 | g = udev_list_entry_get_name(ll); | |
ef63833d | 254 | if (g) { |
4b94f3b8 ZJS |
255 | b = strappend("_UDEV_DEVLINK=", g); |
256 | if (b) { | |
257 | IOVEC_SET_STRING(iovec[n++], b); | |
258 | z++; | |
259 | } | |
ef63833d LP |
260 | } |
261 | ||
262 | j++; | |
263 | } | |
264 | ||
265 | udev_device_unref(ud); | |
266 | } | |
267 | } | |
268 | ||
e9f600f2 | 269 | if (asprintf(&source_time, "_SOURCE_MONOTONIC_TIMESTAMP=%llu", usec) >= 0) |
ef63833d LP |
270 | IOVEC_SET_STRING(iovec[n++], source_time); |
271 | ||
272 | IOVEC_SET_STRING(iovec[n++], "_TRANSPORT=kernel"); | |
273 | ||
274 | if (asprintf(&syslog_priority, "PRIORITY=%i", priority & LOG_PRIMASK) >= 0) | |
275 | IOVEC_SET_STRING(iovec[n++], syslog_priority); | |
276 | ||
36dd072c MS |
277 | if (asprintf(&syslog_facility, "SYSLOG_FACILITY=%i", LOG_FAC(priority)) >= 0) |
278 | IOVEC_SET_STRING(iovec[n++], syslog_facility); | |
279 | ||
ef63833d LP |
280 | if ((priority & LOG_FACMASK) == LOG_KERN) |
281 | IOVEC_SET_STRING(iovec[n++], "SYSLOG_IDENTIFIER=kernel"); | |
282 | else { | |
e88baee8 | 283 | pl -= syslog_parse_identifier((const char**) &p, &identifier, &pid); |
ef63833d LP |
284 | |
285 | /* Avoid any messages we generated ourselves via | |
286 | * log_info() and friends. */ | |
287 | if (pid && is_us(pid)) | |
288 | goto finish; | |
289 | ||
290 | if (identifier) { | |
291 | syslog_identifier = strappend("SYSLOG_IDENTIFIER=", identifier); | |
292 | if (syslog_identifier) | |
293 | IOVEC_SET_STRING(iovec[n++], syslog_identifier); | |
294 | } | |
295 | ||
296 | if (pid) { | |
297 | syslog_pid = strappend("SYSLOG_PID=", pid); | |
298 | if (syslog_pid) | |
299 | IOVEC_SET_STRING(iovec[n++], syslog_pid); | |
300 | } | |
ef63833d LP |
301 | } |
302 | ||
303 | message = cunescape_length_with_prefix(p, pl, "MESSAGE="); | |
304 | if (message) | |
305 | IOVEC_SET_STRING(iovec[n++], message); | |
306 | ||
968f3196 | 307 | server_dispatch_message(s, iovec, n, ELEMENTSOF(iovec), NULL, NULL, NULL, 0, NULL, priority, 0); |
ef63833d LP |
308 | |
309 | finish: | |
310 | for (j = 0; j < z; j++) | |
311 | free(iovec[j].iov_base); | |
312 | ||
313 | free(message); | |
314 | free(syslog_priority); | |
315 | free(syslog_identifier); | |
316 | free(syslog_pid); | |
317 | free(syslog_facility); | |
318 | free(source_time); | |
319 | free(identifier); | |
320 | free(pid); | |
321 | } | |
322 | ||
f9a810be | 323 | static int server_read_dev_kmsg(Server *s) { |
ef63833d LP |
324 | char buffer[8192+1]; /* the kernel-side limit per record is 8K currently */ |
325 | ssize_t l; | |
326 | ||
327 | assert(s); | |
328 | assert(s->dev_kmsg_fd >= 0); | |
329 | ||
330 | l = read(s->dev_kmsg_fd, buffer, sizeof(buffer) - 1); | |
331 | if (l == 0) | |
332 | return 0; | |
333 | if (l < 0) { | |
334 | /* Old kernels who don't allow reading from /dev/kmsg | |
335 | * return EINVAL when we try. So handle this cleanly, | |
336 | * but don' try to ever read from it again. */ | |
337 | if (errno == EINVAL) { | |
f9a810be | 338 | s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source); |
ef63833d LP |
339 | return 0; |
340 | } | |
341 | ||
342 | if (errno == EAGAIN || errno == EINTR || errno == EPIPE) | |
343 | return 0; | |
344 | ||
345 | log_error("Failed to read from kernel: %m"); | |
346 | return -errno; | |
347 | } | |
348 | ||
349 | dev_kmsg_record(s, buffer, l); | |
350 | return 1; | |
351 | } | |
352 | ||
353 | int server_flush_dev_kmsg(Server *s) { | |
354 | int r; | |
355 | ||
356 | assert(s); | |
357 | ||
358 | if (s->dev_kmsg_fd < 0) | |
359 | return 0; | |
360 | ||
361 | if (!s->dev_kmsg_readable) | |
362 | return 0; | |
363 | ||
2b43f939 | 364 | log_debug("Flushing /dev/kmsg..."); |
ef63833d LP |
365 | |
366 | for (;;) { | |
367 | r = server_read_dev_kmsg(s); | |
368 | if (r < 0) | |
369 | return r; | |
370 | ||
371 | if (r == 0) | |
372 | break; | |
373 | } | |
374 | ||
375 | return 0; | |
376 | } | |
377 | ||
f9a810be LP |
378 | static int dispatch_dev_kmsg(sd_event_source *es, int fd, uint32_t revents, void *userdata) { |
379 | Server *s = userdata; | |
380 | ||
381 | assert(es); | |
382 | assert(fd == s->dev_kmsg_fd); | |
383 | assert(s); | |
384 | ||
385 | if (revents & EPOLLERR) | |
386 | log_warning("/dev/kmsg buffer overrun, some messages lost."); | |
387 | ||
388 | if (!(revents & EPOLLIN)) | |
389 | log_error("Got invalid event from epoll for /dev/kmsg: %"PRIx32, revents); | |
390 | ||
391 | return server_read_dev_kmsg(s); | |
392 | } | |
393 | ||
ef63833d | 394 | int server_open_dev_kmsg(Server *s) { |
f9a810be | 395 | int r; |
ef63833d LP |
396 | |
397 | assert(s); | |
398 | ||
399 | s->dev_kmsg_fd = open("/dev/kmsg", O_RDWR|O_CLOEXEC|O_NONBLOCK|O_NOCTTY); | |
400 | if (s->dev_kmsg_fd < 0) { | |
445ea9be LP |
401 | log_full(errno == ENOENT ? LOG_DEBUG : LOG_WARNING, |
402 | "Failed to open /dev/kmsg, ignoring: %m"); | |
ef63833d LP |
403 | return 0; |
404 | } | |
405 | ||
151b9b96 | 406 | r = sd_event_add_io(s->event, &s->dev_kmsg_event_source, s->dev_kmsg_fd, EPOLLIN, dispatch_dev_kmsg, s); |
f9a810be | 407 | if (r < 0) { |
ef63833d LP |
408 | |
409 | /* This will fail with EPERM on older kernels where | |
410 | * /dev/kmsg is not readable. */ | |
c0f71f46 LP |
411 | if (r == -EPERM) { |
412 | r = 0; | |
413 | goto fail; | |
414 | } | |
ef63833d | 415 | |
f9a810be | 416 | log_error("Failed to add /dev/kmsg fd to event loop: %s", strerror(-r)); |
c0f71f46 | 417 | goto fail; |
f9a810be LP |
418 | } |
419 | ||
420 | r = sd_event_source_set_priority(s->dev_kmsg_event_source, SD_EVENT_PRIORITY_IMPORTANT+10); | |
421 | if (r < 0) { | |
422 | log_error("Failed to adjust priority of kmsg event source: %s", strerror(-r)); | |
c0f71f46 | 423 | goto fail; |
ef63833d LP |
424 | } |
425 | ||
426 | s->dev_kmsg_readable = true; | |
427 | ||
428 | return 0; | |
c0f71f46 LP |
429 | |
430 | fail: | |
03e334a1 LP |
431 | s->dev_kmsg_event_source = sd_event_source_unref(s->dev_kmsg_event_source); |
432 | s->dev_kmsg_fd = safe_close(s->dev_kmsg_fd); | |
c0f71f46 LP |
433 | |
434 | return r; | |
ef63833d LP |
435 | } |
436 | ||
437 | int server_open_kernel_seqnum(Server *s) { | |
03e334a1 | 438 | _cleanup_close_ int fd; |
ef63833d LP |
439 | uint64_t *p; |
440 | ||
441 | assert(s); | |
442 | ||
443 | /* We store the seqnum we last read in an mmaped file. That | |
444 | * way we can just use it like a variable, but it is | |
b2e6df73 | 445 | * persistent and automatically flushed at reboot. */ |
ef63833d LP |
446 | |
447 | fd = open("/run/systemd/journal/kernel-seqnum", O_RDWR|O_CREAT|O_CLOEXEC|O_NOCTTY|O_NOFOLLOW, 0644); | |
448 | if (fd < 0) { | |
449 | log_error("Failed to open /run/systemd/journal/kernel-seqnum, ignoring: %m"); | |
450 | return 0; | |
451 | } | |
452 | ||
453 | if (posix_fallocate(fd, 0, sizeof(uint64_t)) < 0) { | |
454 | log_error("Failed to allocate sequential number file, ignoring: %m"); | |
ef63833d LP |
455 | return 0; |
456 | } | |
457 | ||
458 | p = mmap(NULL, sizeof(uint64_t), PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0); | |
459 | if (p == MAP_FAILED) { | |
460 | log_error("Failed to map sequential number file, ignoring: %m"); | |
ef63833d LP |
461 | return 0; |
462 | } | |
463 | ||
ef63833d LP |
464 | s->kernel_seqnum = p; |
465 | ||
466 | return 0; | |
467 | } |