]>
Commit | Line | Data |
---|---|---|
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" |
73b910a3 | 47 | #include "lxccontainer.h" |
cb8c5720 | 48 | |
9de31d5a CB |
49 | #ifndef HAVE_STRLCPY |
50 | #include "include/strlcpy.h" | |
51 | #endif | |
52 | ||
c57dbb96 CB |
53 | /* We're logging in seconds and nanoseconds. Assuming that the underlying |
54 | * datatype is currently at maximum a 64bit integer, we have a date string that | |
55 | * is of maximum length (2^64 - 1) * 2 = (21 + 21) = 42. | |
56 | */ | |
eab15c1e | 57 | #define LXC_LOG_TIME_SIZE ((LXC_NUMSTRLEN64)*2) |
6a22e862 | 58 | |
9f4f402a | 59 | int lxc_log_fd = -1; |
64c57ea1 | 60 | static int syslog_enable = 0; |
858377e4 SH |
61 | int lxc_quiet_specified; |
62 | int lxc_log_use_global_fd; | |
63 | static int lxc_loglevel_specified; | |
64 | ||
6b9f3917 | 65 | static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc"; |
ab1bf971 | 66 | static char *log_fname = NULL; |
64c57ea1 | 67 | static char *log_vmname = NULL; |
cb8c5720 CLG |
68 | |
69 | lxc_log_define(lxc_log, lxc); | |
70 | ||
64c57ea1 BD |
71 | static int lxc_log_priority_to_syslog(int priority) |
72 | { | |
73 | switch (priority) { | |
4b73005c | 74 | case LXC_LOG_LEVEL_FATAL: |
64c57ea1 | 75 | return LOG_EMERG; |
4b73005c | 76 | case LXC_LOG_LEVEL_ALERT: |
64c57ea1 | 77 | return LOG_ALERT; |
4b73005c | 78 | case LXC_LOG_LEVEL_CRIT: |
64c57ea1 | 79 | return LOG_CRIT; |
4b73005c | 80 | case LXC_LOG_LEVEL_ERROR: |
64c57ea1 | 81 | return LOG_ERR; |
4b73005c | 82 | case LXC_LOG_LEVEL_WARN: |
64c57ea1 | 83 | return LOG_WARNING; |
4b73005c CB |
84 | case LXC_LOG_LEVEL_NOTICE: |
85 | case LXC_LOG_LEVEL_NOTSET: | |
64c57ea1 | 86 | return LOG_NOTICE; |
4b73005c | 87 | case LXC_LOG_LEVEL_INFO: |
64c57ea1 | 88 | return LOG_INFO; |
4b73005c CB |
89 | case LXC_LOG_LEVEL_TRACE: |
90 | case LXC_LOG_LEVEL_DEBUG: | |
64c57ea1 BD |
91 | return LOG_DEBUG; |
92 | } | |
93 | ||
94 | /* Not reached */ | |
95 | return LOG_NOTICE; | |
96 | } | |
97 | ||
98 | /*---------------------------------------------------------------------------*/ | |
99 | static int log_append_syslog(const struct lxc_log_appender *appender, | |
100 | struct lxc_log_event *event) | |
101 | { | |
102 | char *msg; | |
103 | int rc, len; | |
104 | va_list args; | |
c7b17051 CB |
105 | const char *log_container_name = log_vmname; |
106 | ||
107 | #ifndef NO_LXC_CONF | |
108 | if (current_config && !log_container_name) | |
109 | log_container_name = current_config->name; | |
110 | #endif | |
64c57ea1 BD |
111 | |
112 | if (!syslog_enable) | |
113 | return 0; | |
114 | ||
115 | va_copy(args, *event->vap); | |
116 | len = vsnprintf(NULL, 0, event->fmt, args) + 1; | |
117 | va_end(args); | |
c7b17051 | 118 | |
64c57ea1 BD |
119 | msg = malloc(len * sizeof(char)); |
120 | if (msg == NULL) | |
121 | return 0; | |
c7b17051 | 122 | |
64c57ea1 BD |
123 | rc = vsnprintf(msg, len, event->fmt, *event->vap); |
124 | if (rc == -1 || rc >= len) { | |
125 | free(msg); | |
126 | return 0; | |
127 | } | |
128 | ||
129 | syslog(lxc_log_priority_to_syslog(event->priority), | |
76d0127f | 130 | "%s%s %s - %s:%s:%d - %s" , |
c7b17051 CB |
131 | log_container_name ? log_container_name : "", |
132 | log_container_name ? ":" : "", | |
64c57ea1 BD |
133 | event->category, |
134 | event->locinfo->file, event->locinfo->func, | |
135 | event->locinfo->line, | |
136 | msg); | |
137 | free(msg); | |
c7b17051 | 138 | |
64c57ea1 BD |
139 | return 0; |
140 | } | |
141 | ||
d737c074 MN |
142 | /*---------------------------------------------------------------------------*/ |
143 | static int log_append_stderr(const struct lxc_log_appender *appender, | |
144 | struct lxc_log_event *event) | |
145 | { | |
c7b17051 CB |
146 | const char *log_container_name; |
147 | ||
4b73005c | 148 | if (event->priority < LXC_LOG_LEVEL_ERROR) |
d737c074 MN |
149 | return 0; |
150 | ||
c7b17051 CB |
151 | log_container_name = log_vmname; |
152 | ||
153 | #ifndef NO_LXC_CONF | |
154 | if (current_config && !log_container_name) | |
155 | log_container_name = current_config->name; | |
156 | #endif | |
157 | ||
158 | fprintf(stderr, "%s: %s%s", log_prefix, | |
159 | log_container_name ? log_container_name : "", | |
160 | log_container_name ? ": " : ""); | |
161 | fprintf(stderr, "%s: %s: %d ", event->locinfo->file, | |
162 | event->locinfo->func, event->locinfo->line); | |
d737c074 MN |
163 | vfprintf(stderr, event->fmt, *event->vap); |
164 | fprintf(stderr, "\n"); | |
c7b17051 | 165 | |
d737c074 MN |
166 | return 0; |
167 | } | |
168 | ||
cb8c5720 | 169 | /*---------------------------------------------------------------------------*/ |
65a9df89 CB |
170 | int lxc_unix_epoch_to_utc(char *buf, size_t bufsize, const struct timespec *time) |
171 | { | |
d86c0d08 CB |
172 | int64_t epoch_to_days, z, era, doe, yoe, year, doy, mp, day, month, |
173 | d_in_s, hours, h_in_s, minutes, seconds; | |
eab15c1e | 174 | char nanosec[LXC_NUMSTRLEN64]; |
65a9df89 CB |
175 | int ret; |
176 | ||
177 | /* See https://howardhinnant.github.io/date_algorithms.html for an | |
178 | * explanation of the algorithm used here. | |
179 | */ | |
d86c0d08 CB |
180 | |
181 | /* Convert Epoch in seconds to number of days. */ | |
182 | epoch_to_days = time->tv_sec / 86400; | |
183 | ||
184 | /* Shift the Epoch from 1970-01-01 to 0000-03-01. */ | |
185 | z = epoch_to_days + 719468; | |
186 | ||
187 | /* compute the era from the serial date by simply dividing by the number | |
188 | * of days in an era (146097). | |
189 | */ | |
65a9df89 | 190 | era = (z >= 0 ? z : z - 146096) / 146097; |
d86c0d08 CB |
191 | |
192 | /* The day-of-era (doe) can then be found by subtracting the era number | |
193 | * times the number of days per era, from the serial date. | |
194 | */ | |
65a9df89 | 195 | doe = (z - era * 146097); |
d86c0d08 CB |
196 | |
197 | /* From the day-of-era (doe), the year-of-era (yoe, range [0, 399]) can | |
198 | * be computed. | |
199 | */ | |
65a9df89 | 200 | yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; |
d86c0d08 CB |
201 | |
202 | /* Given year-of-era, and era, one can now compute the year. */ | |
86698d38 | 203 | year = yoe + era * 400; |
d86c0d08 CB |
204 | |
205 | /* Also the day-of-year, again with the year beginning on Mar. 1, can be | |
206 | * computed from the day-of-era and year-of-era. | |
207 | */ | |
65a9df89 | 208 | doy = doe - (365 * yoe + yoe / 4 - yoe / 100); |
d86c0d08 CB |
209 | |
210 | /* Given day-of-year, find the month number. */ | |
65a9df89 | 211 | mp = (5 * doy + 2) / 153; |
d86c0d08 CB |
212 | |
213 | /* From day-of-year and month-of-year we can now easily compute | |
214 | * day-of-month. | |
215 | */ | |
65a9df89 | 216 | day = doy - (153 * mp + 2) / 5 + 1; |
d86c0d08 CB |
217 | |
218 | /* Transform the month number from the [0, 11] / [Mar, Feb] system to | |
219 | * the civil system: [1, 12] to find the correct month. | |
220 | */ | |
65a9df89 | 221 | month = mp + (mp < 10 ? 3 : -9); |
d86c0d08 | 222 | |
86698d38 CB |
223 | /* The algorithm assumes that a year begins on 1 March, so add 1 before |
224 | * that. */ | |
225 | if (month < 3) | |
226 | year++; | |
227 | ||
d86c0d08 CB |
228 | /* Transform days in the epoch to seconds. */ |
229 | d_in_s = epoch_to_days * 86400; | |
230 | ||
231 | /* To find the current hour simply substract the Epoch_to_days from the | |
232 | * total Epoch and divide by the number of seconds in an hour. | |
233 | */ | |
65a9df89 | 234 | hours = (time->tv_sec - d_in_s) / 3600; |
d86c0d08 CB |
235 | |
236 | /* Transform hours to seconds. */ | |
65a9df89 | 237 | h_in_s = hours * 3600; |
d86c0d08 CB |
238 | |
239 | /* Calculate minutes by substracting the seconds for all days in the | |
240 | * epoch and for all hours in the epoch and divide by the number of | |
241 | * minutes in an hour. | |
242 | */ | |
65a9df89 | 243 | minutes = (time->tv_sec - d_in_s - h_in_s) / 60; |
d86c0d08 CB |
244 | |
245 | /* Calculate the seconds by substracting the seconds for all days in the | |
246 | * epoch, hours in the epoch and minutes in the epoch. | |
247 | */ | |
65a9df89 CB |
248 | seconds = (time->tv_sec - d_in_s - h_in_s - (minutes * 60)); |
249 | ||
d86c0d08 | 250 | /* Make string from nanoseconds. */ |
291f64ac | 251 | ret = snprintf(nanosec, LXC_NUMSTRLEN64, "%"PRId64, (int64_t)time->tv_nsec); |
eab15c1e | 252 | if (ret < 0 || ret >= LXC_NUMSTRLEN64) |
65a9df89 | 253 | return -1; |
d86c0d08 CB |
254 | |
255 | /* Create final timestamp for the log and shorten nanoseconds to 3 | |
256 | * digit precision. | |
257 | */ | |
9d7468fd CB |
258 | ret = snprintf(buf, bufsize, |
259 | "%" PRId64 "%02" PRId64 "%02" PRId64 "%02" PRId64 | |
260 | "%02" PRId64 "%02" PRId64 ".%.3s", | |
65a9df89 CB |
261 | year, month, day, hours, minutes, seconds, nanosec); |
262 | if (ret < 0 || (size_t)ret >= bufsize) | |
263 | return -1; | |
264 | ||
265 | return 0; | |
266 | } | |
267 | ||
c57dbb96 CB |
268 | /* This function needs to make extra sure that it is thread-safe. We had some |
269 | * problems with that before. This especially involves time-conversion | |
270 | * functions. I don't want to find any localtime() or gmtime() functions or | |
271 | * relatives in here. Not even localtime_r() or gmtime_r() or relatives. They | |
272 | * all fiddle with global variables and locking in various libcs. They cause | |
273 | * deadlocks when liblxc is used multi-threaded and no matter how smart you | |
274 | * think you are, you __will__ cause trouble using them. | |
275 | * (As a short example how this can cause trouble: LXD uses forkstart to fork | |
276 | * off a new process that runs the container. At the same time the go runtime | |
277 | * LXD relies on does its own multi-threading thing which we can't controll. The | |
278 | * fork()ing + threading then seems to mess with the locking states in these | |
279 | * time functions causing deadlocks.) | |
280 | * The current solution is to be good old unix people and use the Epoch as our | |
281 | * reference point and simply use the seconds and nanoseconds that have past | |
282 | * since then. This relies on clock_gettime() which is explicitly marked MT-Safe | |
283 | * with no restrictions! This way, anyone who is really strongly invested in | |
284 | * getting the actual time the log entry was created, can just convert it for | |
285 | * themselves. Our logging is mostly done for debugging purposes so don't try | |
286 | * to make it pretty. Pretty might cost you thread-safety. | |
287 | */ | |
cb8c5720 | 288 | static int log_append_logfile(const struct lxc_log_appender *appender, |
5fd8380b | 289 | struct lxc_log_event *event) |
cb8c5720 CLG |
290 | { |
291 | char buffer[LXC_LOG_BUFFER_SIZE]; | |
e1378d35 | 292 | char date_time[LXC_LOG_TIME_SIZE]; |
be5c06ec | 293 | int n, ret; |
858377e4 | 294 | int fd_to_use = -1; |
c7b17051 | 295 | const char *log_container_name = log_vmname; |
42e56013 | 296 | |
858377e4 | 297 | #ifndef NO_LXC_CONF |
c7b17051 CB |
298 | if (current_config) { |
299 | if (!lxc_log_use_global_fd) | |
300 | fd_to_use = current_config->logfd; | |
301 | ||
302 | if (!log_container_name) | |
303 | log_container_name = current_config->name; | |
304 | } | |
858377e4 SH |
305 | #endif |
306 | ||
307 | if (fd_to_use == -1) | |
308 | fd_to_use = lxc_log_fd; | |
309 | ||
310 | if (fd_to_use == -1) | |
cb8c5720 CLG |
311 | return 0; |
312 | ||
e1378d35 | 313 | if (lxc_unix_epoch_to_utc(date_time, LXC_LOG_TIME_SIZE, &event->timestamp) < 0) |
c57dbb96 CB |
314 | return 0; |
315 | ||
316 | n = snprintf(buffer, sizeof(buffer), | |
512845bc | 317 | "%s%s%s %s %-8s %s - %s:%s:%d - ", |
c57dbb96 | 318 | log_prefix, |
c7b17051 CB |
319 | log_container_name ? " " : "", |
320 | log_container_name ? log_container_name : "", | |
e1378d35 | 321 | date_time, |
c57dbb96 CB |
322 | lxc_log_priority_to_string(event->priority), |
323 | event->category, | |
324 | event->locinfo->file, event->locinfo->func, | |
325 | event->locinfo->line); | |
cb8c5720 | 326 | |
f6c79610 LZ |
327 | if (n < 0) |
328 | return n; | |
cb8c5720 | 329 | |
be5c06ec CB |
330 | if ((size_t)n < (sizeof(buffer) - 1)) { |
331 | ret = vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt, *event->vap); | |
332 | if (ret < 0) | |
333 | return 0; | |
334 | ||
335 | n += ret; | |
336 | } | |
b0a507d7 CB |
337 | |
338 | if ((size_t)n >= sizeof(buffer)) | |
cb8c5720 | 339 | n = sizeof(buffer) - 1; |
cb8c5720 CLG |
340 | |
341 | buffer[n] = '\n'; | |
342 | ||
858377e4 | 343 | return write(fd_to_use, buffer, n + 1); |
cb8c5720 CLG |
344 | } |
345 | ||
64c57ea1 BD |
346 | static struct lxc_log_appender log_appender_syslog = { |
347 | .name = "syslog", | |
348 | .append = log_append_syslog, | |
349 | .next = NULL, | |
350 | }; | |
351 | ||
d737c074 MN |
352 | static struct lxc_log_appender log_appender_stderr = { |
353 | .name = "stderr", | |
354 | .append = log_append_stderr, | |
355 | .next = NULL, | |
356 | }; | |
357 | ||
cb8c5720 CLG |
358 | static struct lxc_log_appender log_appender_logfile = { |
359 | .name = "logfile", | |
360 | .append = log_append_logfile, | |
441e4963 | 361 | .next = NULL, |
cb8c5720 CLG |
362 | }; |
363 | ||
364 | static struct lxc_log_category log_root = { | |
365 | .name = "root", | |
4b73005c | 366 | .priority = LXC_LOG_LEVEL_ERROR, |
cb8c5720 CLG |
367 | .appender = NULL, |
368 | .parent = NULL, | |
369 | }; | |
370 | ||
371 | struct lxc_log_category lxc_log_category_lxc = { | |
372 | .name = "lxc", | |
4b73005c | 373 | .priority = LXC_LOG_LEVEL_ERROR, |
858377e4 | 374 | .appender = &log_appender_logfile, |
cb8c5720 CLG |
375 | .parent = &log_root |
376 | }; | |
377 | ||
378 | /*---------------------------------------------------------------------------*/ | |
5e1e7aaf SH |
379 | static int build_dir(const char *name) |
380 | { | |
5e1e7aaf | 381 | int ret; |
1a0e70ac | 382 | char *e, *n, *p; |
5e1e7aaf | 383 | |
1a0e70ac CB |
384 | /* Make copy of string since we'll be modifying it. */ |
385 | n = strdup(name); | |
5e1e7aaf SH |
386 | if (!n) { |
387 | ERROR("Out of memory while creating directory '%s'.", name); | |
388 | return -1; | |
389 | } | |
390 | ||
391 | e = &n[strlen(n)]; | |
392 | for (p = n+1; p < e; p++) { | |
393 | if (*p != '/') | |
394 | continue; | |
395 | *p = '\0'; | |
396 | if (access(n, F_OK)) { | |
397 | ret = lxc_unpriv(mkdir(n, 0755)); | |
8479c136 | 398 | if (ret && errno != EEXIST) { |
5e1e7aaf SH |
399 | SYSERROR("failed to create directory '%s'.", n); |
400 | free(n); | |
401 | return -1; | |
402 | } | |
403 | } | |
404 | *p = '/'; | |
405 | } | |
406 | free(n); | |
407 | return 0; | |
408 | } | |
409 | ||
cb8c5720 CLG |
410 | /*---------------------------------------------------------------------------*/ |
411 | static int log_open(const char *name) | |
412 | { | |
413 | int fd; | |
414 | int newfd; | |
415 | ||
28f602ff DL |
416 | fd = lxc_unpriv(open(name, O_CREAT | O_WRONLY | |
417 | O_APPEND | O_CLOEXEC, 0666)); | |
cb8c5720 | 418 | if (fd == -1) { |
6d1400b5 | 419 | SYSERROR("Failed to open log file \"%s\"", name); |
cb8c5720 CLG |
420 | return -1; |
421 | } | |
422 | ||
423 | if (fd > 2) | |
424 | return fd; | |
425 | ||
426 | newfd = fcntl(fd, F_DUPFD_CLOEXEC, 3); | |
427 | if (newfd == -1) | |
6d1400b5 | 428 | SYSERROR("Failed to dup log fd %d", fd); |
cb8c5720 CLG |
429 | |
430 | close(fd); | |
431 | return newfd; | |
432 | } | |
433 | ||
ab1bf971 DE |
434 | /* |
435 | * Build the path to the log file | |
436 | * @name : the name of the container | |
437 | * @lxcpath : the lxcpath to use as a basename or NULL to use LOGPATH | |
ec64264d | 438 | * Returns malloced path on success, or NULL on failure |
ab1bf971 DE |
439 | */ |
440 | static char *build_log_path(const char *name, const char *lxcpath) | |
5e1e7aaf SH |
441 | { |
442 | char *p; | |
ee25a44f DE |
443 | int len, ret, use_dir; |
444 | ||
74f052dd SG |
445 | if (!name) |
446 | return NULL; | |
447 | ||
ee25a44f DE |
448 | #if USE_CONFIGPATH_LOGS |
449 | use_dir = 1; | |
450 | #else | |
451 | use_dir = 0; | |
452 | #endif | |
5e1e7aaf SH |
453 | |
454 | /* | |
ee25a44f DE |
455 | * If USE_CONFIGPATH_LOGS is true or lxcpath is given, the resulting |
456 | * path will be: | |
5e1e7aaf | 457 | * '$logpath' + '/' + '$name' + '/' + '$name' + '.log' + '\0' |
ab1bf971 DE |
458 | * |
459 | * If USE_CONFIGPATH_LOGS is false the resulting path will be: | |
460 | * '$logpath' + '/' + '$name' + '.log' + '\0' | |
5e1e7aaf | 461 | */ |
ab1bf971 | 462 | len = strlen(name) + 6; /* 6 == '/' + '.log' + '\0' */ |
ee25a44f DE |
463 | if (lxcpath) |
464 | use_dir = 1; | |
465 | else | |
ab1bf971 | 466 | lxcpath = LOGPATH; |
ee25a44f DE |
467 | |
468 | if (use_dir) | |
469 | len += strlen(lxcpath) + 1 + strlen(name) + 1; /* add "/$container_name/" */ | |
470 | else | |
471 | len += strlen(lxcpath) + 1; | |
5e1e7aaf SH |
472 | p = malloc(len); |
473 | if (!p) | |
474 | return p; | |
ee25a44f DE |
475 | |
476 | if (use_dir) | |
477 | ret = snprintf(p, len, "%s/%s/%s.log", lxcpath, name, name); | |
478 | else | |
479 | ret = snprintf(p, len, "%s/%s.log", lxcpath, name); | |
480 | ||
5e1e7aaf SH |
481 | if (ret < 0 || ret >= len) { |
482 | free(p); | |
483 | return NULL; | |
484 | } | |
485 | return p; | |
486 | } | |
487 | ||
d9c9b180 SH |
488 | extern void lxc_log_close(void) |
489 | { | |
64c57ea1 BD |
490 | closelog(); |
491 | free(log_vmname); | |
492 | log_vmname = NULL; | |
d9c9b180 SH |
493 | if (lxc_log_fd == -1) |
494 | return; | |
495 | close(lxc_log_fd); | |
496 | lxc_log_fd = -1; | |
497 | free(log_fname); | |
498 | log_fname = NULL; | |
499 | } | |
500 | ||
ab1bf971 DE |
501 | /* |
502 | * This can be called: | |
503 | * 1. when a program calls lxc_log_init with no logfile parameter (in which | |
46cc906d | 504 | * case the default is used). In this case lxc.loge can override this. |
ab1bf971 | 505 | * 2. when a program calls lxc_log_init with a logfile parameter. In this |
46cc906d | 506 | * case we don't want lxc.log to override this. |
507 | * 3. When a lxc.log entry is found in config file. | |
ab1bf971 DE |
508 | */ |
509 | static int __lxc_log_set_file(const char *fname, int create_dirs) | |
510 | { | |
1a0e70ac CB |
511 | /* we are overriding the default. */ |
512 | if (lxc_log_fd != -1) | |
d9c9b180 | 513 | lxc_log_close(); |
ab1bf971 | 514 | |
97bc2422 CB |
515 | if (!fname) |
516 | return -1; | |
3f53c691 SH |
517 | |
518 | if (strlen(fname) == 0) { | |
6edbfc86 SG |
519 | log_fname = NULL; |
520 | return 0; | |
521 | } | |
522 | ||
ab1bf971 | 523 | #if USE_CONFIGPATH_LOGS |
1a0e70ac CB |
524 | /* We don't build_dir for the default if the default is i.e. |
525 | * /var/lib/lxc/$container/$container.log. | |
526 | */ | |
ab1bf971 DE |
527 | if (create_dirs) |
528 | #endif | |
529 | if (build_dir(fname)) { | |
6d1400b5 | 530 | SYSERROR("Failed to create dir for log file \"%s\"", fname); |
ab1bf971 DE |
531 | return -1; |
532 | } | |
533 | ||
534 | lxc_log_fd = log_open(fname); | |
535 | if (lxc_log_fd == -1) | |
536 | return -1; | |
537 | ||
538 | log_fname = strdup(fname); | |
539 | return 0; | |
540 | } | |
541 | ||
542 | static int _lxc_log_set_file(const char *name, const char *lxcpath, int create_dirs) | |
543 | { | |
544 | char *logfile; | |
545 | int ret; | |
546 | ||
547 | logfile = build_log_path(name, lxcpath); | |
548 | if (!logfile) { | |
549 | ERROR("could not build log path"); | |
550 | return -1; | |
551 | } | |
552 | ret = __lxc_log_set_file(logfile, create_dirs); | |
553 | free(logfile); | |
554 | return ret; | |
555 | } | |
5e1e7aaf | 556 | |
64c57ea1 BD |
557 | extern int lxc_log_syslog(int facility) |
558 | { | |
559 | struct lxc_log_appender *appender; | |
560 | ||
561 | openlog(log_prefix, LOG_PID, facility); | |
562 | if (!lxc_log_category_lxc.appender) { | |
563 | lxc_log_category_lxc.appender = &log_appender_syslog; | |
564 | return 0; | |
565 | } | |
26e92b0e FA |
566 | |
567 | appender = lxc_log_category_lxc.appender; | |
568 | /* Check if syslog was already added, to avoid creating a loop */ | |
569 | while (appender) { | |
570 | if (appender == &log_appender_syslog) { | |
571 | /* not an error: openlog re-opened the connection */ | |
572 | return 0; | |
573 | } | |
574 | appender = appender->next; | |
575 | } | |
576 | ||
64c57ea1 BD |
577 | appender = lxc_log_category_lxc.appender; |
578 | while (appender->next != NULL) | |
579 | appender = appender->next; | |
580 | appender->next = &log_appender_syslog; | |
581 | ||
582 | return 0; | |
583 | } | |
584 | ||
585 | extern void lxc_log_enable_syslog(void) | |
586 | { | |
587 | syslog_enable = 1; | |
588 | } | |
589 | ||
858377e4 SH |
590 | /* |
591 | * lxc_log_init: | |
592 | * Called from lxc front-end programs (like lxc-create, lxc-start) to | |
593 | * initalize the log defaults. | |
594 | */ | |
73b910a3 | 595 | extern int lxc_log_init(struct lxc_log *log) |
cb8c5720 | 596 | { |
4b73005c | 597 | int lxc_priority = LXC_LOG_LEVEL_ERROR; |
5e1e7aaf | 598 | int ret; |
51cab631 | 599 | |
ab1bf971 DE |
600 | if (lxc_log_fd != -1) { |
601 | WARN("lxc_log_init called with log already initialized"); | |
2312f31b | 602 | return 0; |
ab1bf971 | 603 | } |
2312f31b | 604 | |
4b73005c CB |
605 | if (log->level) |
606 | lxc_priority = lxc_log_priority_to_int(log->level); | |
51cab631 | 607 | |
858377e4 SH |
608 | if (!lxc_loglevel_specified) { |
609 | lxc_log_category_lxc.priority = lxc_priority; | |
610 | lxc_loglevel_specified = 1; | |
611 | } | |
cb8c5720 | 612 | |
01db0197 | 613 | if (!lxc_quiet_specified) { |
73b910a3 | 614 | if (!log->quiet) |
01db0197 WD |
615 | lxc_log_category_lxc.appender->next = &log_appender_stderr; |
616 | } | |
441e4963 | 617 | |
73b910a3 | 618 | if (log->prefix) |
619 | lxc_log_set_prefix(log->prefix); | |
74476cf1 | 620 | |
73b910a3 | 621 | if (log->name) |
622 | log_vmname = strdup(log->name); | |
64c57ea1 | 623 | |
73b910a3 | 624 | if (log->file) { |
625 | if (strcmp(log->file, "none") == 0) | |
ab1bf971 | 626 | return 0; |
73b910a3 | 627 | ret = __lxc_log_set_file(log->file, 1); |
858377e4 | 628 | lxc_log_use_global_fd = 1; |
5e1e7aaf | 629 | } else { |
74f052dd | 630 | /* if no name was specified, there nothing to do */ |
73b910a3 | 631 | if (!log->name) |
74f052dd SG |
632 | return 0; |
633 | ||
ab1bf971 DE |
634 | ret = -1; |
635 | ||
73b910a3 | 636 | if (!log->lxcpath) |
637 | log->lxcpath = LOGPATH; | |
e0b0b533 | 638 | |
361e0e3c | 639 | /* try LOGPATH if lxcpath is the default for the privileged containers */ |
73b910a3 | 640 | if (!geteuid() && strcmp(LXCPATH, log->lxcpath) == 0) |
641 | ret = _lxc_log_set_file(log->name, NULL, 0); | |
5e1e7aaf | 642 | |
ab1bf971 DE |
643 | /* try in lxcpath */ |
644 | if (ret < 0) | |
73b910a3 | 645 | ret = _lxc_log_set_file(log->name, log->lxcpath, 1); |
ab1bf971 DE |
646 | |
647 | /* try LOGPATH in case its writable by the caller */ | |
648 | if (ret < 0) | |
73b910a3 | 649 | ret = _lxc_log_set_file(log->name, NULL, 0); |
ab1bf971 | 650 | } |
5e1e7aaf | 651 | |
5e1e7aaf | 652 | /* |
ab1bf971 DE |
653 | * If !file, that is, if the user did not request this logpath, then |
654 | * ignore failures and continue logging to console | |
5e1e7aaf | 655 | */ |
73b910a3 | 656 | if (!log->file && ret != 0) { |
5e1e7aaf SH |
657 | INFO("Ignoring failure to open default logfile."); |
658 | ret = 0; | |
659 | } | |
660 | ||
5e1e7aaf | 661 | return ret; |
cb8c5720 | 662 | } |
4a85ce2a SH |
663 | |
664 | /* | |
46cc906d | 665 | * This is called when we read a lxc.log.level entry in a lxc.conf file. This |
4a85ce2a SH |
666 | * happens after processing command line arguments, which override the .conf |
667 | * settings. So only set the level if previously unset. | |
668 | */ | |
858377e4 | 669 | extern int lxc_log_set_level(int *dest, int level) |
4a85ce2a | 670 | { |
4b73005c | 671 | if (level < 0 || level >= LXC_LOG_LEVEL_NOTSET) { |
4a85ce2a SH |
672 | ERROR("invalid log priority %d", level); |
673 | return -1; | |
674 | } | |
858377e4 | 675 | *dest = level; |
4a85ce2a SH |
676 | return 0; |
677 | } | |
678 | ||
ab1bf971 DE |
679 | extern int lxc_log_get_level(void) |
680 | { | |
ab1bf971 DE |
681 | return lxc_log_category_lxc.priority; |
682 | } | |
683 | ||
fabf7361 QH |
684 | extern bool lxc_log_has_valid_level(void) |
685 | { | |
686 | int log_level = lxc_log_get_level(); | |
4b73005c | 687 | if (log_level < 0 || log_level >= LXC_LOG_LEVEL_NOTSET) |
fabf7361 QH |
688 | return false; |
689 | return true; | |
690 | } | |
691 | ||
4a85ce2a | 692 | /* |
ab1bf971 DE |
693 | * This is called when we read a lxc.logfile entry in a lxc.conf file. This |
694 | * happens after processing command line arguments, which override the .conf | |
695 | * settings. So only set the file if previously unset. | |
4a85ce2a | 696 | */ |
858377e4 | 697 | extern int lxc_log_set_file(int *fd, const char *fname) |
4a85ce2a | 698 | { |
858377e4 SH |
699 | if (*fd != -1) { |
700 | close(*fd); | |
701 | *fd = -1; | |
702 | } | |
703 | ||
704 | if (build_dir(fname)) { | |
6d1400b5 | 705 | SYSERROR("Failed to create dir for log file \"%s\"", fname); |
858377e4 SH |
706 | return -1; |
707 | } | |
708 | ||
709 | *fd = log_open(fname); | |
710 | if (*fd == -1) | |
711 | return -errno; | |
712 | return 0; | |
4a85ce2a | 713 | } |
9ea87d5d | 714 | |
ab1bf971 | 715 | extern const char *lxc_log_get_file(void) |
5e1e7aaf | 716 | { |
ab1bf971 | 717 | return log_fname; |
5e1e7aaf SH |
718 | } |
719 | ||
ab1bf971 | 720 | extern void lxc_log_set_prefix(const char *prefix) |
9ea87d5d | 721 | { |
9de31d5a CB |
722 | /* We don't care if thte prefix is truncated. */ |
723 | (void)strlcpy(log_prefix, prefix, sizeof(log_prefix)); | |
9ea87d5d SH |
724 | } |
725 | ||
ab1bf971 | 726 | extern const char *lxc_log_get_prefix(void) |
9ea87d5d | 727 | { |
ab1bf971 | 728 | return log_prefix; |
9ea87d5d | 729 | } |
6edbfc86 SG |
730 | |
731 | extern void lxc_log_options_no_override() | |
732 | { | |
01db0197 | 733 | lxc_quiet_specified = 1; |
858377e4 | 734 | lxc_loglevel_specified = 1; |
6edbfc86 | 735 | } |