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e0b4037d DL |
1 | /* |
2 | * lxc: linux Container library | |
3 | * | |
4 | * (C) Copyright IBM Corp. 2007, 2008 | |
5 | * | |
6 | * Authors: | |
7 | * Cedric Le Goater <legoater@free.fr> | |
8 | * | |
9 | * This library is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU Lesser General Public | |
11 | * License as published by the Free Software Foundation; either | |
12 | * version 2.1 of the License, or (at your option) any later version. | |
13 | * | |
14 | * This library is distributed in the hope that it will be useful, | |
15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
17 | * Lesser General Public License for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU Lesser General Public | |
20 | * License along with this library; if not, write to the Free Software | |
250b1eec | 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
e0b4037d | 22 | */ |
b4c42474 CB |
23 | |
24 | #define _GNU_SOURCE | |
65a9df89 | 25 | #define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */ |
65a9df89 | 26 | #include <stdint.h> |
0ad19a3f | 27 | #include <stdio.h> |
28 | #include <errno.h> | |
65a9df89 | 29 | #include <inttypes.h> |
cb8c5720 CLG |
30 | #include <limits.h> |
31 | #include <unistd.h> | |
32 | #include <sys/types.h> | |
33 | #include <sys/stat.h> | |
34 | #include <string.h> | |
858377e4 | 35 | #include <pthread.h> |
02d25a9e | 36 | #include <time.h> |
cb8c5720 | 37 | |
64c57ea1 BD |
38 | #include <syslog.h> |
39 | #include <stdio.h> | |
40 | ||
cb8c5720 CLG |
41 | #include <fcntl.h> |
42 | #include <stdlib.h> | |
43 | ||
28f602ff DL |
44 | #include "log.h" |
45 | #include "caps.h" | |
ab1bf971 | 46 | #include "utils.h" |
cb8c5720 | 47 | |
c57dbb96 CB |
48 | /* We're logging in seconds and nanoseconds. Assuming that the underlying |
49 | * datatype is currently at maximum a 64bit integer, we have a date string that | |
50 | * is of maximum length (2^64 - 1) * 2 = (21 + 21) = 42. | |
51 | */ | |
eab15c1e | 52 | #define LXC_LOG_TIME_SIZE ((LXC_NUMSTRLEN64)*2) |
6a22e862 | 53 | |
9f4f402a | 54 | int lxc_log_fd = -1; |
64c57ea1 | 55 | static int syslog_enable = 0; |
858377e4 SH |
56 | int lxc_quiet_specified; |
57 | int lxc_log_use_global_fd; | |
58 | static int lxc_loglevel_specified; | |
59 | ||
6b9f3917 | 60 | static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc"; |
ab1bf971 | 61 | static char *log_fname = NULL; |
64c57ea1 | 62 | static char *log_vmname = NULL; |
cb8c5720 CLG |
63 | |
64 | lxc_log_define(lxc_log, lxc); | |
65 | ||
64c57ea1 BD |
66 | static int lxc_log_priority_to_syslog(int priority) |
67 | { | |
68 | switch (priority) { | |
69 | case LXC_LOG_PRIORITY_FATAL: | |
70 | return LOG_EMERG; | |
71 | case LXC_LOG_PRIORITY_ALERT: | |
72 | return LOG_ALERT; | |
73 | case LXC_LOG_PRIORITY_CRIT: | |
74 | return LOG_CRIT; | |
75 | case LXC_LOG_PRIORITY_ERROR: | |
76 | return LOG_ERR; | |
77 | case LXC_LOG_PRIORITY_WARN: | |
78 | return LOG_WARNING; | |
79 | case LXC_LOG_PRIORITY_NOTICE: | |
80 | case LXC_LOG_PRIORITY_NOTSET: | |
81 | return LOG_NOTICE; | |
82 | case LXC_LOG_PRIORITY_INFO: | |
83 | return LOG_INFO; | |
84 | case LXC_LOG_PRIORITY_TRACE: | |
85 | case LXC_LOG_PRIORITY_DEBUG: | |
86 | return LOG_DEBUG; | |
87 | } | |
88 | ||
89 | /* Not reached */ | |
90 | return LOG_NOTICE; | |
91 | } | |
92 | ||
93 | /*---------------------------------------------------------------------------*/ | |
94 | static int log_append_syslog(const struct lxc_log_appender *appender, | |
95 | struct lxc_log_event *event) | |
96 | { | |
97 | char *msg; | |
98 | int rc, len; | |
99 | va_list args; | |
100 | ||
101 | if (!syslog_enable) | |
102 | return 0; | |
103 | ||
104 | va_copy(args, *event->vap); | |
105 | len = vsnprintf(NULL, 0, event->fmt, args) + 1; | |
106 | va_end(args); | |
107 | msg = malloc(len * sizeof(char)); | |
108 | if (msg == NULL) | |
109 | return 0; | |
110 | rc = vsnprintf(msg, len, event->fmt, *event->vap); | |
111 | if (rc == -1 || rc >= len) { | |
112 | free(msg); | |
113 | return 0; | |
114 | } | |
115 | ||
116 | syslog(lxc_log_priority_to_syslog(event->priority), | |
76d0127f | 117 | "%s%s %s - %s:%s:%d - %s" , |
64c57ea1 | 118 | log_vmname ? log_vmname : "", |
76d0127f | 119 | log_vmname ? ":" : "", |
64c57ea1 BD |
120 | event->category, |
121 | event->locinfo->file, event->locinfo->func, | |
122 | event->locinfo->line, | |
123 | msg); | |
124 | free(msg); | |
125 | return 0; | |
126 | } | |
127 | ||
d737c074 MN |
128 | /*---------------------------------------------------------------------------*/ |
129 | static int log_append_stderr(const struct lxc_log_appender *appender, | |
130 | struct lxc_log_event *event) | |
131 | { | |
132 | if (event->priority < LXC_LOG_PRIORITY_ERROR) | |
133 | return 0; | |
134 | ||
c3ff6e24 | 135 | fprintf(stderr, "%s: %s%s", log_prefix, log_vmname ? log_vmname : "", log_vmname ? ": " : ""); |
15bc516e | 136 | fprintf(stderr, "%s: %s: %d ", event->locinfo->file, event->locinfo->func, event->locinfo->line); |
d737c074 MN |
137 | vfprintf(stderr, event->fmt, *event->vap); |
138 | fprintf(stderr, "\n"); | |
139 | return 0; | |
140 | } | |
141 | ||
cb8c5720 | 142 | /*---------------------------------------------------------------------------*/ |
65a9df89 CB |
143 | int lxc_unix_epoch_to_utc(char *buf, size_t bufsize, const struct timespec *time) |
144 | { | |
d86c0d08 CB |
145 | int64_t epoch_to_days, z, era, doe, yoe, year, doy, mp, day, month, |
146 | d_in_s, hours, h_in_s, minutes, seconds; | |
eab15c1e | 147 | char nanosec[LXC_NUMSTRLEN64]; |
65a9df89 CB |
148 | int ret; |
149 | ||
150 | /* See https://howardhinnant.github.io/date_algorithms.html for an | |
151 | * explanation of the algorithm used here. | |
152 | */ | |
d86c0d08 CB |
153 | |
154 | /* Convert Epoch in seconds to number of days. */ | |
155 | epoch_to_days = time->tv_sec / 86400; | |
156 | ||
157 | /* Shift the Epoch from 1970-01-01 to 0000-03-01. */ | |
158 | z = epoch_to_days + 719468; | |
159 | ||
160 | /* compute the era from the serial date by simply dividing by the number | |
161 | * of days in an era (146097). | |
162 | */ | |
65a9df89 | 163 | era = (z >= 0 ? z : z - 146096) / 146097; |
d86c0d08 CB |
164 | |
165 | /* The day-of-era (doe) can then be found by subtracting the era number | |
166 | * times the number of days per era, from the serial date. | |
167 | */ | |
65a9df89 | 168 | doe = (z - era * 146097); |
d86c0d08 CB |
169 | |
170 | /* From the day-of-era (doe), the year-of-era (yoe, range [0, 399]) can | |
171 | * be computed. | |
172 | */ | |
65a9df89 | 173 | yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; |
d86c0d08 CB |
174 | |
175 | /* Given year-of-era, and era, one can now compute the year. */ | |
86698d38 | 176 | year = yoe + era * 400; |
d86c0d08 CB |
177 | |
178 | /* Also the day-of-year, again with the year beginning on Mar. 1, can be | |
179 | * computed from the day-of-era and year-of-era. | |
180 | */ | |
65a9df89 | 181 | doy = doe - (365 * yoe + yoe / 4 - yoe / 100); |
d86c0d08 CB |
182 | |
183 | /* Given day-of-year, find the month number. */ | |
65a9df89 | 184 | mp = (5 * doy + 2) / 153; |
d86c0d08 CB |
185 | |
186 | /* From day-of-year and month-of-year we can now easily compute | |
187 | * day-of-month. | |
188 | */ | |
65a9df89 | 189 | day = doy - (153 * mp + 2) / 5 + 1; |
d86c0d08 CB |
190 | |
191 | /* Transform the month number from the [0, 11] / [Mar, Feb] system to | |
192 | * the civil system: [1, 12] to find the correct month. | |
193 | */ | |
65a9df89 | 194 | month = mp + (mp < 10 ? 3 : -9); |
d86c0d08 | 195 | |
86698d38 CB |
196 | /* The algorithm assumes that a year begins on 1 March, so add 1 before |
197 | * that. */ | |
198 | if (month < 3) | |
199 | year++; | |
200 | ||
d86c0d08 CB |
201 | /* Transform days in the epoch to seconds. */ |
202 | d_in_s = epoch_to_days * 86400; | |
203 | ||
204 | /* To find the current hour simply substract the Epoch_to_days from the | |
205 | * total Epoch and divide by the number of seconds in an hour. | |
206 | */ | |
65a9df89 | 207 | hours = (time->tv_sec - d_in_s) / 3600; |
d86c0d08 CB |
208 | |
209 | /* Transform hours to seconds. */ | |
65a9df89 | 210 | h_in_s = hours * 3600; |
d86c0d08 CB |
211 | |
212 | /* Calculate minutes by substracting the seconds for all days in the | |
213 | * epoch and for all hours in the epoch and divide by the number of | |
214 | * minutes in an hour. | |
215 | */ | |
65a9df89 | 216 | minutes = (time->tv_sec - d_in_s - h_in_s) / 60; |
d86c0d08 CB |
217 | |
218 | /* Calculate the seconds by substracting the seconds for all days in the | |
219 | * epoch, hours in the epoch and minutes in the epoch. | |
220 | */ | |
65a9df89 CB |
221 | seconds = (time->tv_sec - d_in_s - h_in_s - (minutes * 60)); |
222 | ||
d86c0d08 | 223 | /* Make string from nanoseconds. */ |
eab15c1e CB |
224 | ret = snprintf(nanosec, LXC_NUMSTRLEN64, "%ld", time->tv_nsec); |
225 | if (ret < 0 || ret >= LXC_NUMSTRLEN64) | |
65a9df89 | 226 | return -1; |
d86c0d08 CB |
227 | |
228 | /* Create final timestamp for the log and shorten nanoseconds to 3 | |
229 | * digit precision. | |
230 | */ | |
9d7468fd CB |
231 | ret = snprintf(buf, bufsize, |
232 | "%" PRId64 "%02" PRId64 "%02" PRId64 "%02" PRId64 | |
233 | "%02" PRId64 "%02" PRId64 ".%.3s", | |
65a9df89 CB |
234 | year, month, day, hours, minutes, seconds, nanosec); |
235 | if (ret < 0 || (size_t)ret >= bufsize) | |
236 | return -1; | |
237 | ||
238 | return 0; | |
239 | } | |
240 | ||
c57dbb96 CB |
241 | /* This function needs to make extra sure that it is thread-safe. We had some |
242 | * problems with that before. This especially involves time-conversion | |
243 | * functions. I don't want to find any localtime() or gmtime() functions or | |
244 | * relatives in here. Not even localtime_r() or gmtime_r() or relatives. They | |
245 | * all fiddle with global variables and locking in various libcs. They cause | |
246 | * deadlocks when liblxc is used multi-threaded and no matter how smart you | |
247 | * think you are, you __will__ cause trouble using them. | |
248 | * (As a short example how this can cause trouble: LXD uses forkstart to fork | |
249 | * off a new process that runs the container. At the same time the go runtime | |
250 | * LXD relies on does its own multi-threading thing which we can't controll. The | |
251 | * fork()ing + threading then seems to mess with the locking states in these | |
252 | * time functions causing deadlocks.) | |
253 | * The current solution is to be good old unix people and use the Epoch as our | |
254 | * reference point and simply use the seconds and nanoseconds that have past | |
255 | * since then. This relies on clock_gettime() which is explicitly marked MT-Safe | |
256 | * with no restrictions! This way, anyone who is really strongly invested in | |
257 | * getting the actual time the log entry was created, can just convert it for | |
258 | * themselves. Our logging is mostly done for debugging purposes so don't try | |
259 | * to make it pretty. Pretty might cost you thread-safety. | |
260 | */ | |
cb8c5720 | 261 | static int log_append_logfile(const struct lxc_log_appender *appender, |
5fd8380b | 262 | struct lxc_log_event *event) |
cb8c5720 CLG |
263 | { |
264 | char buffer[LXC_LOG_BUFFER_SIZE]; | |
e1378d35 CB |
265 | char date_time[LXC_LOG_TIME_SIZE]; |
266 | int n; | |
858377e4 | 267 | int fd_to_use = -1; |
42e56013 | 268 | |
858377e4 SH |
269 | #ifndef NO_LXC_CONF |
270 | if (!lxc_log_use_global_fd && current_config) | |
271 | fd_to_use = current_config->logfd; | |
272 | #endif | |
273 | ||
274 | if (fd_to_use == -1) | |
275 | fd_to_use = lxc_log_fd; | |
276 | ||
277 | if (fd_to_use == -1) | |
cb8c5720 CLG |
278 | return 0; |
279 | ||
e1378d35 | 280 | if (lxc_unix_epoch_to_utc(date_time, LXC_LOG_TIME_SIZE, &event->timestamp) < 0) |
c57dbb96 CB |
281 | return 0; |
282 | ||
283 | n = snprintf(buffer, sizeof(buffer), | |
e1378d35 | 284 | "%15s%s%s %s %-8s %s - %s:%s:%d - ", |
c57dbb96 CB |
285 | log_prefix, |
286 | log_vmname ? " " : "", | |
287 | log_vmname ? log_vmname : "", | |
e1378d35 | 288 | date_time, |
c57dbb96 CB |
289 | lxc_log_priority_to_string(event->priority), |
290 | event->category, | |
291 | event->locinfo->file, event->locinfo->func, | |
292 | event->locinfo->line); | |
cb8c5720 | 293 | |
f6c79610 LZ |
294 | if (n < 0) |
295 | return n; | |
cb8c5720 | 296 | |
450b6d3d | 297 | if ((size_t)n < (sizeof(buffer) - 1)) |
0dcdbf8a CB |
298 | n += vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt, *event->vap); |
299 | else | |
cb8c5720 | 300 | n = sizeof(buffer) - 1; |
cb8c5720 CLG |
301 | |
302 | buffer[n] = '\n'; | |
303 | ||
858377e4 | 304 | return write(fd_to_use, buffer, n + 1); |
cb8c5720 CLG |
305 | } |
306 | ||
64c57ea1 BD |
307 | static struct lxc_log_appender log_appender_syslog = { |
308 | .name = "syslog", | |
309 | .append = log_append_syslog, | |
310 | .next = NULL, | |
311 | }; | |
312 | ||
d737c074 MN |
313 | static struct lxc_log_appender log_appender_stderr = { |
314 | .name = "stderr", | |
315 | .append = log_append_stderr, | |
316 | .next = NULL, | |
317 | }; | |
318 | ||
cb8c5720 CLG |
319 | static struct lxc_log_appender log_appender_logfile = { |
320 | .name = "logfile", | |
321 | .append = log_append_logfile, | |
441e4963 | 322 | .next = NULL, |
cb8c5720 CLG |
323 | }; |
324 | ||
325 | static struct lxc_log_category log_root = { | |
326 | .name = "root", | |
327 | .priority = LXC_LOG_PRIORITY_ERROR, | |
328 | .appender = NULL, | |
329 | .parent = NULL, | |
330 | }; | |
331 | ||
332 | struct lxc_log_category lxc_log_category_lxc = { | |
333 | .name = "lxc", | |
334 | .priority = LXC_LOG_PRIORITY_ERROR, | |
858377e4 | 335 | .appender = &log_appender_logfile, |
cb8c5720 CLG |
336 | .parent = &log_root |
337 | }; | |
338 | ||
339 | /*---------------------------------------------------------------------------*/ | |
5e1e7aaf SH |
340 | static int build_dir(const char *name) |
341 | { | |
342 | char *n = strdup(name); // because we'll be modifying it | |
343 | char *p, *e; | |
344 | int ret; | |
345 | ||
346 | if (!n) { | |
347 | ERROR("Out of memory while creating directory '%s'.", name); | |
348 | return -1; | |
349 | } | |
350 | ||
351 | e = &n[strlen(n)]; | |
352 | for (p = n+1; p < e; p++) { | |
353 | if (*p != '/') | |
354 | continue; | |
355 | *p = '\0'; | |
356 | if (access(n, F_OK)) { | |
357 | ret = lxc_unpriv(mkdir(n, 0755)); | |
8479c136 | 358 | if (ret && errno != EEXIST) { |
5e1e7aaf SH |
359 | SYSERROR("failed to create directory '%s'.", n); |
360 | free(n); | |
361 | return -1; | |
362 | } | |
363 | } | |
364 | *p = '/'; | |
365 | } | |
366 | free(n); | |
367 | return 0; | |
368 | } | |
369 | ||
cb8c5720 CLG |
370 | /*---------------------------------------------------------------------------*/ |
371 | static int log_open(const char *name) | |
372 | { | |
373 | int fd; | |
374 | int newfd; | |
375 | ||
28f602ff DL |
376 | fd = lxc_unpriv(open(name, O_CREAT | O_WRONLY | |
377 | O_APPEND | O_CLOEXEC, 0666)); | |
cb8c5720 CLG |
378 | if (fd == -1) { |
379 | ERROR("failed to open log file \"%s\" : %s", name, | |
380 | strerror(errno)); | |
381 | return -1; | |
382 | } | |
383 | ||
384 | if (fd > 2) | |
385 | return fd; | |
386 | ||
387 | newfd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
388 | if (newfd == -1) | |
389 | ERROR("failed to dup log fd %d : %s", fd, strerror(errno)); | |
390 | ||
391 | close(fd); | |
392 | return newfd; | |
393 | } | |
394 | ||
ab1bf971 DE |
395 | /* |
396 | * Build the path to the log file | |
397 | * @name : the name of the container | |
398 | * @lxcpath : the lxcpath to use as a basename or NULL to use LOGPATH | |
ec64264d | 399 | * Returns malloced path on success, or NULL on failure |
ab1bf971 DE |
400 | */ |
401 | static char *build_log_path(const char *name, const char *lxcpath) | |
5e1e7aaf SH |
402 | { |
403 | char *p; | |
ee25a44f DE |
404 | int len, ret, use_dir; |
405 | ||
74f052dd SG |
406 | if (!name) |
407 | return NULL; | |
408 | ||
ee25a44f DE |
409 | #if USE_CONFIGPATH_LOGS |
410 | use_dir = 1; | |
411 | #else | |
412 | use_dir = 0; | |
413 | #endif | |
5e1e7aaf SH |
414 | |
415 | /* | |
ee25a44f DE |
416 | * If USE_CONFIGPATH_LOGS is true or lxcpath is given, the resulting |
417 | * path will be: | |
5e1e7aaf | 418 | * '$logpath' + '/' + '$name' + '/' + '$name' + '.log' + '\0' |
ab1bf971 DE |
419 | * |
420 | * If USE_CONFIGPATH_LOGS is false the resulting path will be: | |
421 | * '$logpath' + '/' + '$name' + '.log' + '\0' | |
5e1e7aaf | 422 | */ |
ab1bf971 | 423 | len = strlen(name) + 6; /* 6 == '/' + '.log' + '\0' */ |
ee25a44f DE |
424 | if (lxcpath) |
425 | use_dir = 1; | |
426 | else | |
ab1bf971 | 427 | lxcpath = LOGPATH; |
ee25a44f DE |
428 | |
429 | if (use_dir) | |
430 | len += strlen(lxcpath) + 1 + strlen(name) + 1; /* add "/$container_name/" */ | |
431 | else | |
432 | len += strlen(lxcpath) + 1; | |
5e1e7aaf SH |
433 | p = malloc(len); |
434 | if (!p) | |
435 | return p; | |
ee25a44f DE |
436 | |
437 | if (use_dir) | |
438 | ret = snprintf(p, len, "%s/%s/%s.log", lxcpath, name, name); | |
439 | else | |
440 | ret = snprintf(p, len, "%s/%s.log", lxcpath, name); | |
441 | ||
5e1e7aaf SH |
442 | if (ret < 0 || ret >= len) { |
443 | free(p); | |
444 | return NULL; | |
445 | } | |
446 | return p; | |
447 | } | |
448 | ||
d9c9b180 SH |
449 | extern void lxc_log_close(void) |
450 | { | |
64c57ea1 BD |
451 | closelog(); |
452 | free(log_vmname); | |
453 | log_vmname = NULL; | |
d9c9b180 SH |
454 | if (lxc_log_fd == -1) |
455 | return; | |
456 | close(lxc_log_fd); | |
457 | lxc_log_fd = -1; | |
458 | free(log_fname); | |
459 | log_fname = NULL; | |
460 | } | |
461 | ||
ab1bf971 DE |
462 | /* |
463 | * This can be called: | |
464 | * 1. when a program calls lxc_log_init with no logfile parameter (in which | |
465 | * case the default is used). In this case lxc.logfile can override this. | |
466 | * 2. when a program calls lxc_log_init with a logfile parameter. In this | |
467 | * case we don't want lxc.logfile to override this. | |
468 | * 3. When a lxc.logfile entry is found in config file. | |
469 | */ | |
470 | static int __lxc_log_set_file(const char *fname, int create_dirs) | |
471 | { | |
472 | if (lxc_log_fd != -1) { | |
473 | // we are overriding the default. | |
d9c9b180 | 474 | lxc_log_close(); |
ab1bf971 DE |
475 | } |
476 | ||
97bc2422 CB |
477 | if (!fname) |
478 | return -1; | |
3f53c691 SH |
479 | |
480 | if (strlen(fname) == 0) { | |
6edbfc86 SG |
481 | log_fname = NULL; |
482 | return 0; | |
483 | } | |
484 | ||
ab1bf971 DE |
485 | #if USE_CONFIGPATH_LOGS |
486 | // we don't build_dir for the default if the default is | |
487 | // i.e. /var/lib/lxc/$container/$container.log | |
488 | if (create_dirs) | |
489 | #endif | |
490 | if (build_dir(fname)) { | |
491 | ERROR("failed to create dir for log file \"%s\" : %s", fname, | |
492 | strerror(errno)); | |
493 | return -1; | |
494 | } | |
495 | ||
496 | lxc_log_fd = log_open(fname); | |
497 | if (lxc_log_fd == -1) | |
498 | return -1; | |
499 | ||
500 | log_fname = strdup(fname); | |
501 | return 0; | |
502 | } | |
503 | ||
504 | static int _lxc_log_set_file(const char *name, const char *lxcpath, int create_dirs) | |
505 | { | |
506 | char *logfile; | |
507 | int ret; | |
508 | ||
509 | logfile = build_log_path(name, lxcpath); | |
510 | if (!logfile) { | |
511 | ERROR("could not build log path"); | |
512 | return -1; | |
513 | } | |
514 | ret = __lxc_log_set_file(logfile, create_dirs); | |
515 | free(logfile); | |
516 | return ret; | |
517 | } | |
5e1e7aaf | 518 | |
64c57ea1 BD |
519 | extern int lxc_log_syslog(int facility) |
520 | { | |
521 | struct lxc_log_appender *appender; | |
522 | ||
523 | openlog(log_prefix, LOG_PID, facility); | |
524 | if (!lxc_log_category_lxc.appender) { | |
525 | lxc_log_category_lxc.appender = &log_appender_syslog; | |
526 | return 0; | |
527 | } | |
528 | appender = lxc_log_category_lxc.appender; | |
529 | while (appender->next != NULL) | |
530 | appender = appender->next; | |
531 | appender->next = &log_appender_syslog; | |
532 | ||
533 | return 0; | |
534 | } | |
535 | ||
536 | extern void lxc_log_enable_syslog(void) | |
537 | { | |
538 | syslog_enable = 1; | |
539 | } | |
540 | ||
858377e4 SH |
541 | /* |
542 | * lxc_log_init: | |
543 | * Called from lxc front-end programs (like lxc-create, lxc-start) to | |
544 | * initalize the log defaults. | |
545 | */ | |
5e1e7aaf | 546 | extern int lxc_log_init(const char *name, const char *file, |
ab1bf971 DE |
547 | const char *priority, const char *prefix, int quiet, |
548 | const char *lxcpath) | |
cb8c5720 | 549 | { |
51cab631 | 550 | int lxc_priority = LXC_LOG_PRIORITY_ERROR; |
5e1e7aaf | 551 | int ret; |
51cab631 | 552 | |
ab1bf971 DE |
553 | if (lxc_log_fd != -1) { |
554 | WARN("lxc_log_init called with log already initialized"); | |
2312f31b | 555 | return 0; |
ab1bf971 | 556 | } |
2312f31b | 557 | |
af61c481 | 558 | if (priority) |
b12e1cb5 | 559 | lxc_priority = lxc_log_priority_to_int(priority); |
51cab631 | 560 | |
858377e4 SH |
561 | if (!lxc_loglevel_specified) { |
562 | lxc_log_category_lxc.priority = lxc_priority; | |
563 | lxc_loglevel_specified = 1; | |
564 | } | |
cb8c5720 | 565 | |
01db0197 | 566 | if (!lxc_quiet_specified) { |
01db0197 WD |
567 | if (!quiet) |
568 | lxc_log_category_lxc.appender->next = &log_appender_stderr; | |
569 | } | |
441e4963 | 570 | |
cb8c5720 | 571 | if (prefix) |
ab1bf971 | 572 | lxc_log_set_prefix(prefix); |
74476cf1 | 573 | |
64c57ea1 BD |
574 | if (name) |
575 | log_vmname = strdup(name); | |
576 | ||
ab1bf971 | 577 | if (file) { |
ab1bf971 DE |
578 | if (strcmp(file, "none") == 0) |
579 | return 0; | |
580 | ret = __lxc_log_set_file(file, 1); | |
858377e4 | 581 | lxc_log_use_global_fd = 1; |
5e1e7aaf | 582 | } else { |
74f052dd SG |
583 | /* if no name was specified, there nothing to do */ |
584 | if (!name) | |
585 | return 0; | |
586 | ||
ab1bf971 DE |
587 | ret = -1; |
588 | ||
e0b0b533 DE |
589 | if (!lxcpath) |
590 | lxcpath = LOGPATH; | |
591 | ||
361e0e3c | 592 | /* try LOGPATH if lxcpath is the default for the privileged containers */ |
479bba8b | 593 | if (!geteuid() && strcmp(LXCPATH, lxcpath) == 0) |
ab1bf971 | 594 | ret = _lxc_log_set_file(name, NULL, 0); |
5e1e7aaf | 595 | |
ab1bf971 DE |
596 | /* try in lxcpath */ |
597 | if (ret < 0) | |
598 | ret = _lxc_log_set_file(name, lxcpath, 1); | |
599 | ||
600 | /* try LOGPATH in case its writable by the caller */ | |
601 | if (ret < 0) | |
602 | ret = _lxc_log_set_file(name, NULL, 0); | |
603 | } | |
5e1e7aaf | 604 | |
5e1e7aaf | 605 | /* |
ab1bf971 DE |
606 | * If !file, that is, if the user did not request this logpath, then |
607 | * ignore failures and continue logging to console | |
5e1e7aaf | 608 | */ |
ab1bf971 | 609 | if (!file && ret != 0) { |
5e1e7aaf SH |
610 | INFO("Ignoring failure to open default logfile."); |
611 | ret = 0; | |
612 | } | |
613 | ||
5e1e7aaf | 614 | return ret; |
cb8c5720 | 615 | } |
4a85ce2a SH |
616 | |
617 | /* | |
618 | * This is called when we read a lxc.loglevel entry in a lxc.conf file. This | |
619 | * happens after processing command line arguments, which override the .conf | |
620 | * settings. So only set the level if previously unset. | |
621 | */ | |
858377e4 | 622 | extern int lxc_log_set_level(int *dest, int level) |
4a85ce2a | 623 | { |
4a85ce2a SH |
624 | if (level < 0 || level >= LXC_LOG_PRIORITY_NOTSET) { |
625 | ERROR("invalid log priority %d", level); | |
626 | return -1; | |
627 | } | |
858377e4 | 628 | *dest = level; |
4a85ce2a SH |
629 | return 0; |
630 | } | |
631 | ||
ab1bf971 DE |
632 | extern int lxc_log_get_level(void) |
633 | { | |
ab1bf971 DE |
634 | return lxc_log_category_lxc.priority; |
635 | } | |
636 | ||
fabf7361 QH |
637 | extern bool lxc_log_has_valid_level(void) |
638 | { | |
639 | int log_level = lxc_log_get_level(); | |
640 | if (log_level < 0 || log_level >= LXC_LOG_PRIORITY_NOTSET) | |
641 | return false; | |
642 | return true; | |
643 | } | |
644 | ||
4a85ce2a | 645 | /* |
ab1bf971 DE |
646 | * This is called when we read a lxc.logfile entry in a lxc.conf file. This |
647 | * happens after processing command line arguments, which override the .conf | |
648 | * settings. So only set the file if previously unset. | |
4a85ce2a | 649 | */ |
858377e4 | 650 | extern int lxc_log_set_file(int *fd, const char *fname) |
4a85ce2a | 651 | { |
858377e4 SH |
652 | if (*fd != -1) { |
653 | close(*fd); | |
654 | *fd = -1; | |
655 | } | |
656 | ||
657 | if (build_dir(fname)) { | |
658 | ERROR("failed to create dir for log file \"%s\" : %s", fname, | |
659 | strerror(errno)); | |
660 | return -1; | |
661 | } | |
662 | ||
663 | *fd = log_open(fname); | |
664 | if (*fd == -1) | |
665 | return -errno; | |
666 | return 0; | |
4a85ce2a | 667 | } |
9ea87d5d | 668 | |
ab1bf971 | 669 | extern const char *lxc_log_get_file(void) |
5e1e7aaf | 670 | { |
ab1bf971 | 671 | return log_fname; |
5e1e7aaf SH |
672 | } |
673 | ||
ab1bf971 | 674 | extern void lxc_log_set_prefix(const char *prefix) |
9ea87d5d | 675 | { |
ab1bf971 DE |
676 | strncpy(log_prefix, prefix, sizeof(log_prefix)); |
677 | log_prefix[sizeof(log_prefix) - 1] = 0; | |
9ea87d5d SH |
678 | } |
679 | ||
ab1bf971 | 680 | extern const char *lxc_log_get_prefix(void) |
9ea87d5d | 681 | { |
ab1bf971 | 682 | return log_prefix; |
9ea87d5d | 683 | } |
6edbfc86 SG |
684 | |
685 | extern void lxc_log_options_no_override() | |
686 | { | |
01db0197 | 687 | lxc_quiet_specified = 1; |
858377e4 | 688 | lxc_loglevel_specified = 1; |
6edbfc86 | 689 | } |