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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 | 23 | |
d38dd64a CB |
24 | #ifndef _GNU_SOURCE |
25 | #define _GNU_SOURCE 1 | |
26 | #endif | |
65a9df89 | 27 | #define __STDC_FORMAT_MACROS /* Required for PRIu64 to work. */ |
0ad19a3f | 28 | #include <errno.h> |
d38dd64a | 29 | #include <fcntl.h> |
65a9df89 | 30 | #include <inttypes.h> |
cb8c5720 | 31 | #include <limits.h> |
858377e4 | 32 | #include <pthread.h> |
d38dd64a | 33 | #include <stdint.h> |
64c57ea1 | 34 | #include <stdio.h> |
cb8c5720 | 35 | #include <stdlib.h> |
d38dd64a CB |
36 | #include <string.h> |
37 | #include <sys/stat.h> | |
38 | #include <sys/types.h> | |
39 | #include <syslog.h> | |
40 | #include <unistd.h> | |
cb8c5720 | 41 | |
28f602ff | 42 | #include "caps.h" |
d38dd64a CB |
43 | #include "config.h" |
44 | #include "log.h" | |
73b910a3 | 45 | #include "lxccontainer.h" |
d38dd64a | 46 | #include "utils.h" |
cb8c5720 | 47 | |
9de31d5a CB |
48 | #ifndef HAVE_STRLCPY |
49 | #include "include/strlcpy.h" | |
50 | #endif | |
51 | ||
5c7bfc02 | 52 | #if HAVE_DLOG |
53 | #include <dlog.h> | |
54 | ||
55 | #undef LOG_TAG | |
56 | #define LOG_TAG "LXC" | |
57 | #endif | |
58 | ||
c57dbb96 CB |
59 | /* We're logging in seconds and nanoseconds. Assuming that the underlying |
60 | * datatype is currently at maximum a 64bit integer, we have a date string that | |
61 | * is of maximum length (2^64 - 1) * 2 = (21 + 21) = 42. | |
62 | */ | |
3a2c65f8 | 63 | #define LXC_LOG_TIME_SIZE ((INTTYPE_TO_STRLEN(uint64_t)) * 2) |
6a22e862 | 64 | |
9f4f402a | 65 | int lxc_log_fd = -1; |
64c57ea1 | 66 | static int syslog_enable = 0; |
858377e4 SH |
67 | int lxc_quiet_specified; |
68 | int lxc_log_use_global_fd; | |
69 | static int lxc_loglevel_specified; | |
70 | ||
6b9f3917 | 71 | static char log_prefix[LXC_LOG_PREFIX_SIZE] = "lxc"; |
ab1bf971 | 72 | static char *log_fname = NULL; |
64c57ea1 | 73 | static char *log_vmname = NULL; |
cb8c5720 | 74 | |
ac2cecc4 | 75 | lxc_log_define(log, lxc); |
cb8c5720 | 76 | |
64c57ea1 BD |
77 | static int lxc_log_priority_to_syslog(int priority) |
78 | { | |
79 | switch (priority) { | |
4b73005c | 80 | case LXC_LOG_LEVEL_FATAL: |
64c57ea1 | 81 | return LOG_EMERG; |
4b73005c | 82 | case LXC_LOG_LEVEL_ALERT: |
64c57ea1 | 83 | return LOG_ALERT; |
4b73005c | 84 | case LXC_LOG_LEVEL_CRIT: |
64c57ea1 | 85 | return LOG_CRIT; |
4b73005c | 86 | case LXC_LOG_LEVEL_ERROR: |
64c57ea1 | 87 | return LOG_ERR; |
4b73005c | 88 | case LXC_LOG_LEVEL_WARN: |
64c57ea1 | 89 | return LOG_WARNING; |
4b73005c CB |
90 | case LXC_LOG_LEVEL_NOTICE: |
91 | case LXC_LOG_LEVEL_NOTSET: | |
64c57ea1 | 92 | return LOG_NOTICE; |
4b73005c | 93 | case LXC_LOG_LEVEL_INFO: |
64c57ea1 | 94 | return LOG_INFO; |
4b73005c CB |
95 | case LXC_LOG_LEVEL_TRACE: |
96 | case LXC_LOG_LEVEL_DEBUG: | |
64c57ea1 BD |
97 | return LOG_DEBUG; |
98 | } | |
99 | ||
100 | /* Not reached */ | |
101 | return LOG_NOTICE; | |
102 | } | |
103 | ||
8178adc6 | 104 | static const char *lxc_log_get_container_name() |
105 | { | |
106 | #ifndef NO_LXC_CONF | |
107 | if (current_config && !log_vmname) | |
108 | return current_config->name; | |
109 | #endif | |
110 | ||
111 | return log_vmname; | |
112 | } | |
113 | ||
114 | static char *lxc_log_get_va_msg(struct lxc_log_event *event) | |
64c57ea1 BD |
115 | { |
116 | char *msg; | |
117 | int rc, len; | |
118 | va_list args; | |
c7b17051 | 119 | |
8178adc6 | 120 | if (!event) |
121 | return NULL; | |
64c57ea1 BD |
122 | |
123 | va_copy(args, *event->vap); | |
124 | len = vsnprintf(NULL, 0, event->fmt, args) + 1; | |
125 | va_end(args); | |
c7b17051 | 126 | |
64c57ea1 | 127 | msg = malloc(len * sizeof(char)); |
8178adc6 | 128 | if (!msg) |
129 | return NULL; | |
c7b17051 | 130 | |
64c57ea1 BD |
131 | rc = vsnprintf(msg, len, event->fmt, *event->vap); |
132 | if (rc == -1 || rc >= len) { | |
133 | free(msg); | |
8178adc6 | 134 | return NULL; |
64c57ea1 BD |
135 | } |
136 | ||
8178adc6 | 137 | return msg; |
138 | } | |
139 | ||
140 | /*---------------------------------------------------------------------------*/ | |
141 | static int log_append_syslog(const struct lxc_log_appender *appender, | |
142 | struct lxc_log_event *event) | |
143 | { | |
144 | char *msg; | |
145 | const char *log_container_name; | |
146 | ||
147 | if (!syslog_enable) | |
148 | return 0; | |
149 | ||
150 | log_container_name = lxc_log_get_container_name(); | |
151 | ||
152 | msg = lxc_log_get_va_msg(event); | |
153 | if (!msg) | |
154 | return 0; | |
155 | ||
64c57ea1 | 156 | syslog(lxc_log_priority_to_syslog(event->priority), |
8273ba47 | 157 | "%s%s %s - %s:%s:%d - %s" , |
158 | log_container_name ? log_container_name : "", | |
159 | log_container_name ? ":" : "", | |
160 | event->category, | |
161 | event->locinfo->file, event->locinfo->func, | |
162 | event->locinfo->line, | |
163 | msg); | |
64c57ea1 | 164 | free(msg); |
c7b17051 | 165 | |
64c57ea1 BD |
166 | return 0; |
167 | } | |
168 | ||
d737c074 MN |
169 | /*---------------------------------------------------------------------------*/ |
170 | static int log_append_stderr(const struct lxc_log_appender *appender, | |
171 | struct lxc_log_event *event) | |
172 | { | |
c7b17051 CB |
173 | const char *log_container_name; |
174 | ||
4b73005c | 175 | if (event->priority < LXC_LOG_LEVEL_ERROR) |
d737c074 MN |
176 | return 0; |
177 | ||
8178adc6 | 178 | log_container_name = lxc_log_get_container_name(); |
c7b17051 CB |
179 | |
180 | fprintf(stderr, "%s: %s%s", log_prefix, | |
8273ba47 | 181 | log_container_name ? log_container_name : "", |
182 | log_container_name ? ": " : ""); | |
c7b17051 | 183 | fprintf(stderr, "%s: %s: %d ", event->locinfo->file, |
8273ba47 | 184 | event->locinfo->func, event->locinfo->line); |
d737c074 MN |
185 | vfprintf(stderr, event->fmt, *event->vap); |
186 | fprintf(stderr, "\n"); | |
c7b17051 | 187 | |
d737c074 MN |
188 | return 0; |
189 | } | |
190 | ||
cb8c5720 | 191 | /*---------------------------------------------------------------------------*/ |
8273ba47 | 192 | static int lxc_unix_epoch_to_utc(char *buf, size_t bufsize, const struct timespec *time) |
65a9df89 | 193 | { |
d86c0d08 CB |
194 | int64_t epoch_to_days, z, era, doe, yoe, year, doy, mp, day, month, |
195 | d_in_s, hours, h_in_s, minutes, seconds; | |
3a2c65f8 | 196 | char nanosec[INTTYPE_TO_STRLEN(int64_t)]; |
65a9df89 CB |
197 | int ret; |
198 | ||
199 | /* See https://howardhinnant.github.io/date_algorithms.html for an | |
200 | * explanation of the algorithm used here. | |
201 | */ | |
d86c0d08 CB |
202 | |
203 | /* Convert Epoch in seconds to number of days. */ | |
204 | epoch_to_days = time->tv_sec / 86400; | |
205 | ||
206 | /* Shift the Epoch from 1970-01-01 to 0000-03-01. */ | |
207 | z = epoch_to_days + 719468; | |
208 | ||
209 | /* compute the era from the serial date by simply dividing by the number | |
210 | * of days in an era (146097). | |
211 | */ | |
65a9df89 | 212 | era = (z >= 0 ? z : z - 146096) / 146097; |
d86c0d08 CB |
213 | |
214 | /* The day-of-era (doe) can then be found by subtracting the era number | |
215 | * times the number of days per era, from the serial date. | |
216 | */ | |
65a9df89 | 217 | doe = (z - era * 146097); |
d86c0d08 CB |
218 | |
219 | /* From the day-of-era (doe), the year-of-era (yoe, range [0, 399]) can | |
220 | * be computed. | |
221 | */ | |
65a9df89 | 222 | yoe = (doe - doe / 1460 + doe / 36524 - doe / 146096) / 365; |
d86c0d08 CB |
223 | |
224 | /* Given year-of-era, and era, one can now compute the year. */ | |
86698d38 | 225 | year = yoe + era * 400; |
d86c0d08 CB |
226 | |
227 | /* Also the day-of-year, again with the year beginning on Mar. 1, can be | |
228 | * computed from the day-of-era and year-of-era. | |
229 | */ | |
65a9df89 | 230 | doy = doe - (365 * yoe + yoe / 4 - yoe / 100); |
d86c0d08 CB |
231 | |
232 | /* Given day-of-year, find the month number. */ | |
65a9df89 | 233 | mp = (5 * doy + 2) / 153; |
d86c0d08 CB |
234 | |
235 | /* From day-of-year and month-of-year we can now easily compute | |
236 | * day-of-month. | |
237 | */ | |
65a9df89 | 238 | day = doy - (153 * mp + 2) / 5 + 1; |
d86c0d08 CB |
239 | |
240 | /* Transform the month number from the [0, 11] / [Mar, Feb] system to | |
241 | * the civil system: [1, 12] to find the correct month. | |
242 | */ | |
65a9df89 | 243 | month = mp + (mp < 10 ? 3 : -9); |
d86c0d08 | 244 | |
86698d38 CB |
245 | /* The algorithm assumes that a year begins on 1 March, so add 1 before |
246 | * that. */ | |
247 | if (month < 3) | |
248 | year++; | |
249 | ||
d86c0d08 CB |
250 | /* Transform days in the epoch to seconds. */ |
251 | d_in_s = epoch_to_days * 86400; | |
252 | ||
253 | /* To find the current hour simply substract the Epoch_to_days from the | |
254 | * total Epoch and divide by the number of seconds in an hour. | |
255 | */ | |
65a9df89 | 256 | hours = (time->tv_sec - d_in_s) / 3600; |
d86c0d08 CB |
257 | |
258 | /* Transform hours to seconds. */ | |
65a9df89 | 259 | h_in_s = hours * 3600; |
d86c0d08 | 260 | |
29fa2d33 | 261 | /* Calculate minutes by subtracting the seconds for all days in the |
d86c0d08 CB |
262 | * epoch and for all hours in the epoch and divide by the number of |
263 | * minutes in an hour. | |
264 | */ | |
65a9df89 | 265 | minutes = (time->tv_sec - d_in_s - h_in_s) / 60; |
d86c0d08 | 266 | |
29fa2d33 | 267 | /* Calculate the seconds by subtracting the seconds for all days in the |
d86c0d08 CB |
268 | * epoch, hours in the epoch and minutes in the epoch. |
269 | */ | |
65a9df89 CB |
270 | seconds = (time->tv_sec - d_in_s - h_in_s - (minutes * 60)); |
271 | ||
d86c0d08 | 272 | /* Make string from nanoseconds. */ |
979a0d93 CB |
273 | ret = snprintf(nanosec, sizeof(nanosec), "%"PRId64, (int64_t)time->tv_nsec); |
274 | if (ret < 0 || ret >= sizeof(nanosec)) | |
65a9df89 | 275 | return -1; |
d86c0d08 CB |
276 | |
277 | /* Create final timestamp for the log and shorten nanoseconds to 3 | |
278 | * digit precision. | |
279 | */ | |
9d7468fd CB |
280 | ret = snprintf(buf, bufsize, |
281 | "%" PRId64 "%02" PRId64 "%02" PRId64 "%02" PRId64 | |
282 | "%02" PRId64 "%02" PRId64 ".%.3s", | |
65a9df89 CB |
283 | year, month, day, hours, minutes, seconds, nanosec); |
284 | if (ret < 0 || (size_t)ret >= bufsize) | |
285 | return -1; | |
286 | ||
287 | return 0; | |
288 | } | |
289 | ||
c57dbb96 CB |
290 | /* This function needs to make extra sure that it is thread-safe. We had some |
291 | * problems with that before. This especially involves time-conversion | |
292 | * functions. I don't want to find any localtime() or gmtime() functions or | |
293 | * relatives in here. Not even localtime_r() or gmtime_r() or relatives. They | |
294 | * all fiddle with global variables and locking in various libcs. They cause | |
295 | * deadlocks when liblxc is used multi-threaded and no matter how smart you | |
296 | * think you are, you __will__ cause trouble using them. | |
297 | * (As a short example how this can cause trouble: LXD uses forkstart to fork | |
298 | * off a new process that runs the container. At the same time the go runtime | |
25fa6f8c | 299 | * LXD relies on does its own multi-threading thing which we can't control. The |
c57dbb96 CB |
300 | * fork()ing + threading then seems to mess with the locking states in these |
301 | * time functions causing deadlocks.) | |
302 | * The current solution is to be good old unix people and use the Epoch as our | |
303 | * reference point and simply use the seconds and nanoseconds that have past | |
304 | * since then. This relies on clock_gettime() which is explicitly marked MT-Safe | |
305 | * with no restrictions! This way, anyone who is really strongly invested in | |
306 | * getting the actual time the log entry was created, can just convert it for | |
307 | * themselves. Our logging is mostly done for debugging purposes so don't try | |
308 | * to make it pretty. Pretty might cost you thread-safety. | |
309 | */ | |
cb8c5720 | 310 | static int log_append_logfile(const struct lxc_log_appender *appender, |
5fd8380b | 311 | struct lxc_log_event *event) |
cb8c5720 CLG |
312 | { |
313 | char buffer[LXC_LOG_BUFFER_SIZE]; | |
e1378d35 | 314 | char date_time[LXC_LOG_TIME_SIZE]; |
e0c19806 CB |
315 | int n; |
316 | ssize_t ret; | |
858377e4 | 317 | int fd_to_use = -1; |
8178adc6 | 318 | const char *log_container_name; |
42e56013 | 319 | |
858377e4 | 320 | #ifndef NO_LXC_CONF |
8178adc6 | 321 | if (current_config) |
c7b17051 CB |
322 | if (!lxc_log_use_global_fd) |
323 | fd_to_use = current_config->logfd; | |
858377e4 SH |
324 | #endif |
325 | ||
8178adc6 | 326 | log_container_name = lxc_log_get_container_name(); |
327 | ||
858377e4 SH |
328 | if (fd_to_use == -1) |
329 | fd_to_use = lxc_log_fd; | |
330 | ||
331 | if (fd_to_use == -1) | |
cb8c5720 CLG |
332 | return 0; |
333 | ||
e1378d35 | 334 | if (lxc_unix_epoch_to_utc(date_time, LXC_LOG_TIME_SIZE, &event->timestamp) < 0) |
a9d41379 | 335 | return -1; |
c57dbb96 CB |
336 | |
337 | n = snprintf(buffer, sizeof(buffer), | |
8273ba47 | 338 | "%s%s%s %s %-8s %s - %s:%s:%d - ", |
339 | log_prefix, | |
340 | log_container_name ? " " : "", | |
341 | log_container_name ? log_container_name : "", | |
342 | date_time, | |
343 | lxc_log_priority_to_string(event->priority), | |
344 | event->category, | |
345 | event->locinfo->file, event->locinfo->func, | |
346 | event->locinfo->line); | |
f6c79610 LZ |
347 | if (n < 0) |
348 | return n; | |
cb8c5720 | 349 | |
6333c915 | 350 | if ((size_t)n < STRARRAYLEN(buffer)) { |
be5c06ec CB |
351 | ret = vsnprintf(buffer + n, sizeof(buffer) - n, event->fmt, *event->vap); |
352 | if (ret < 0) | |
353 | return 0; | |
354 | ||
355 | n += ret; | |
356 | } | |
b0a507d7 CB |
357 | |
358 | if ((size_t)n >= sizeof(buffer)) | |
6333c915 | 359 | n = STRARRAYLEN(buffer); |
cb8c5720 CLG |
360 | |
361 | buffer[n] = '\n'; | |
362 | ||
e0c19806 CB |
363 | again: |
364 | ret = write(fd_to_use, buffer, n + 1); | |
365 | if (ret < 0 && errno == EINTR) | |
366 | goto again; | |
367 | ||
368 | return ret; | |
cb8c5720 CLG |
369 | } |
370 | ||
5c7bfc02 | 371 | #if HAVE_DLOG |
372 | static int log_append_dlog(const struct lxc_log_appender *appender, | |
373 | struct lxc_log_event *event) | |
374 | { | |
de1c05f3 | 375 | char *msg = lxc_log_get_va_msg(event); |
376 | const char *log_container_name = lxc_log_get_container_name(); | |
5c7bfc02 | 377 | |
de1c05f3 | 378 | switch (event->priority) { |
5c7bfc02 | 379 | case LXC_LOG_LEVEL_TRACE: |
380 | case LXC_LOG_LEVEL_DEBUG: | |
de1c05f3 | 381 | print_log(DLOG_DEBUG, LOG_TAG, "%s: %s(%d) > [%s] %s", |
382 | event->locinfo->file, event->locinfo->func, event->locinfo->line, | |
383 | log_container_name ? log_container_name : "-", | |
384 | msg ? msg : "-"); | |
5c7bfc02 | 385 | break; |
386 | case LXC_LOG_LEVEL_INFO: | |
de1c05f3 | 387 | print_log(DLOG_INFO, LOG_TAG, "%s: %s(%d) > [%s] %s", |
388 | event->locinfo->file, event->locinfo->func, event->locinfo->line, | |
389 | log_container_name ? log_container_name : "-", | |
390 | msg ? msg : "-"); | |
5c7bfc02 | 391 | break; |
392 | case LXC_LOG_LEVEL_NOTICE: | |
393 | case LXC_LOG_LEVEL_WARN: | |
de1c05f3 | 394 | print_log(DLOG_WARN, LOG_TAG, "%s: %s(%d) > [%s] %s", |
395 | event->locinfo->file, event->locinfo->func, event->locinfo->line, | |
396 | log_container_name ? log_container_name : "-", | |
397 | msg ? msg : "-"); | |
5c7bfc02 | 398 | break; |
399 | case LXC_LOG_LEVEL_ERROR: | |
de1c05f3 | 400 | print_log(DLOG_ERROR, LOG_TAG, "%s: %s(%d) > [%s] %s", |
401 | event->locinfo->file, event->locinfo->func, event->locinfo->line, | |
402 | log_container_name ? log_container_name : "-", | |
403 | msg ? msg : "-"); | |
5c7bfc02 | 404 | break; |
405 | case LXC_LOG_LEVEL_CRIT: | |
406 | case LXC_LOG_LEVEL_ALERT: | |
407 | case LXC_LOG_LEVEL_FATAL: | |
de1c05f3 | 408 | print_log(DLOG_FATAL, LOG_TAG, "%s: %s(%d) > [%s] %s", |
409 | event->locinfo->file, event->locinfo->func, event->locinfo->line, | |
410 | log_container_name ? log_container_name : "-", | |
411 | msg ? msg : "-"); | |
5c7bfc02 | 412 | break; |
413 | default: | |
414 | break; | |
415 | } | |
416 | ||
de1c05f3 | 417 | free(msg); |
5c7bfc02 | 418 | return 0; |
419 | } | |
420 | #endif | |
421 | ||
64c57ea1 BD |
422 | static struct lxc_log_appender log_appender_syslog = { |
423 | .name = "syslog", | |
424 | .append = log_append_syslog, | |
425 | .next = NULL, | |
426 | }; | |
427 | ||
d737c074 MN |
428 | static struct lxc_log_appender log_appender_stderr = { |
429 | .name = "stderr", | |
430 | .append = log_append_stderr, | |
431 | .next = NULL, | |
432 | }; | |
433 | ||
cb8c5720 CLG |
434 | static struct lxc_log_appender log_appender_logfile = { |
435 | .name = "logfile", | |
436 | .append = log_append_logfile, | |
441e4963 | 437 | .next = NULL, |
cb8c5720 CLG |
438 | }; |
439 | ||
5c7bfc02 | 440 | #if HAVE_DLOG |
441 | static struct lxc_log_appender log_appender_dlog = { | |
442 | .name = "dlog", | |
443 | .append = log_append_dlog, | |
444 | .next = NULL, | |
445 | }; | |
446 | #endif | |
447 | ||
cb8c5720 CLG |
448 | static struct lxc_log_category log_root = { |
449 | .name = "root", | |
4b73005c | 450 | .priority = LXC_LOG_LEVEL_ERROR, |
cb8c5720 CLG |
451 | .appender = NULL, |
452 | .parent = NULL, | |
453 | }; | |
454 | ||
5c7bfc02 | 455 | #if HAVE_DLOG |
456 | struct lxc_log_category lxc_log_category_lxc = { | |
457 | .name = "lxc", | |
de1c05f3 | 458 | .priority = LXC_LOG_LEVEL_TRACE, |
5c7bfc02 | 459 | .appender = &log_appender_dlog, |
460 | .parent = &log_root | |
461 | }; | |
462 | #else | |
cb8c5720 CLG |
463 | struct lxc_log_category lxc_log_category_lxc = { |
464 | .name = "lxc", | |
4b73005c | 465 | .priority = LXC_LOG_LEVEL_ERROR, |
858377e4 | 466 | .appender = &log_appender_logfile, |
cb8c5720 CLG |
467 | .parent = &log_root |
468 | }; | |
5c7bfc02 | 469 | #endif |
cb8c5720 CLG |
470 | |
471 | /*---------------------------------------------------------------------------*/ | |
5e1e7aaf SH |
472 | static int build_dir(const char *name) |
473 | { | |
1a0e70ac | 474 | char *e, *n, *p; |
5e1e7aaf | 475 | |
202a334b | 476 | /* Make copy of the string since we'll be modifying it. */ |
1a0e70ac | 477 | n = strdup(name); |
202a334b | 478 | if (!n) |
5e1e7aaf | 479 | return -1; |
5e1e7aaf SH |
480 | |
481 | e = &n[strlen(n)]; | |
202a334b CB |
482 | for (p = n + 1; p < e; p++) { |
483 | int ret; | |
484 | ||
5e1e7aaf SH |
485 | if (*p != '/') |
486 | continue; | |
487 | *p = '\0'; | |
7d204776 | 488 | |
202a334b CB |
489 | ret = lxc_unpriv(mkdir(n, 0755)); |
490 | if (ret && errno != EEXIST) { | |
491 | SYSERROR("Failed to create directory %s", n); | |
492 | free(n); | |
493 | return -1; | |
5e1e7aaf | 494 | } |
202a334b | 495 | |
5e1e7aaf SH |
496 | *p = '/'; |
497 | } | |
7d204776 | 498 | |
5e1e7aaf SH |
499 | free(n); |
500 | return 0; | |
501 | } | |
502 | ||
cb8c5720 CLG |
503 | /*---------------------------------------------------------------------------*/ |
504 | static int log_open(const char *name) | |
505 | { | |
506 | int fd; | |
507 | int newfd; | |
508 | ||
202a334b CB |
509 | fd = lxc_unpriv(open(name, O_CREAT | O_WRONLY | O_APPEND | O_CLOEXEC, 0666)); |
510 | if (fd < 0) { | |
6d1400b5 | 511 | SYSERROR("Failed to open log file \"%s\"", name); |
cb8c5720 CLG |
512 | return -1; |
513 | } | |
514 | ||
515 | if (fd > 2) | |
516 | return fd; | |
517 | ||
202a334b | 518 | newfd = fcntl(fd, F_DUPFD_CLOEXEC, STDERR_FILENO); |
cb8c5720 | 519 | if (newfd == -1) |
6d1400b5 | 520 | SYSERROR("Failed to dup log fd %d", fd); |
cb8c5720 CLG |
521 | |
522 | close(fd); | |
523 | return newfd; | |
524 | } | |
525 | ||
ab1bf971 DE |
526 | /* |
527 | * Build the path to the log file | |
528 | * @name : the name of the container | |
529 | * @lxcpath : the lxcpath to use as a basename or NULL to use LOGPATH | |
ec64264d | 530 | * Returns malloced path on success, or NULL on failure |
ab1bf971 DE |
531 | */ |
532 | static char *build_log_path(const char *name, const char *lxcpath) | |
5e1e7aaf SH |
533 | { |
534 | char *p; | |
202a334b CB |
535 | int ret; |
536 | size_t len; | |
537 | bool use_dir; | |
ee25a44f | 538 | |
74f052dd SG |
539 | if (!name) |
540 | return NULL; | |
541 | ||
ee25a44f | 542 | #if USE_CONFIGPATH_LOGS |
202a334b | 543 | use_dir = true; |
ee25a44f | 544 | #else |
202a334b | 545 | use_dir = false; |
ee25a44f | 546 | #endif |
5e1e7aaf SH |
547 | |
548 | /* | |
ee25a44f DE |
549 | * If USE_CONFIGPATH_LOGS is true or lxcpath is given, the resulting |
550 | * path will be: | |
5e1e7aaf | 551 | * '$logpath' + '/' + '$name' + '/' + '$name' + '.log' + '\0' |
ab1bf971 DE |
552 | * |
553 | * If USE_CONFIGPATH_LOGS is false the resulting path will be: | |
554 | * '$logpath' + '/' + '$name' + '.log' + '\0' | |
5e1e7aaf | 555 | */ |
ab1bf971 | 556 | len = strlen(name) + 6; /* 6 == '/' + '.log' + '\0' */ |
ee25a44f | 557 | if (lxcpath) |
202a334b | 558 | use_dir = true; |
ee25a44f | 559 | else |
ab1bf971 | 560 | lxcpath = LOGPATH; |
ee25a44f DE |
561 | |
562 | if (use_dir) | |
563 | len += strlen(lxcpath) + 1 + strlen(name) + 1; /* add "/$container_name/" */ | |
564 | else | |
565 | len += strlen(lxcpath) + 1; | |
7d204776 | 566 | |
5e1e7aaf SH |
567 | p = malloc(len); |
568 | if (!p) | |
569 | return p; | |
ee25a44f DE |
570 | |
571 | if (use_dir) | |
572 | ret = snprintf(p, len, "%s/%s/%s.log", lxcpath, name, name); | |
573 | else | |
574 | ret = snprintf(p, len, "%s/%s.log", lxcpath, name); | |
202a334b | 575 | if (ret < 0 || (size_t)ret >= len) { |
5e1e7aaf SH |
576 | free(p); |
577 | return NULL; | |
578 | } | |
7d204776 | 579 | |
5e1e7aaf SH |
580 | return p; |
581 | } | |
582 | ||
ab1bf971 DE |
583 | /* |
584 | * This can be called: | |
585 | * 1. when a program calls lxc_log_init with no logfile parameter (in which | |
46cc906d | 586 | * case the default is used). In this case lxc.loge can override this. |
ab1bf971 | 587 | * 2. when a program calls lxc_log_init with a logfile parameter. In this |
46cc906d | 588 | * case we don't want lxc.log to override this. |
589 | * 3. When a lxc.log entry is found in config file. | |
ab1bf971 DE |
590 | */ |
591 | static int __lxc_log_set_file(const char *fname, int create_dirs) | |
592 | { | |
1a0e70ac CB |
593 | /* we are overriding the default. */ |
594 | if (lxc_log_fd != -1) | |
d9c9b180 | 595 | lxc_log_close(); |
ab1bf971 | 596 | |
97bc2422 CB |
597 | if (!fname) |
598 | return -1; | |
3f53c691 SH |
599 | |
600 | if (strlen(fname) == 0) { | |
6edbfc86 | 601 | log_fname = NULL; |
03c6d266 | 602 | return -1; |
6edbfc86 SG |
603 | } |
604 | ||
ab1bf971 | 605 | #if USE_CONFIGPATH_LOGS |
1a0e70ac CB |
606 | /* We don't build_dir for the default if the default is i.e. |
607 | * /var/lib/lxc/$container/$container.log. | |
608 | */ | |
ab1bf971 DE |
609 | if (create_dirs) |
610 | #endif | |
611 | if (build_dir(fname)) { | |
6d1400b5 | 612 | SYSERROR("Failed to create dir for log file \"%s\"", fname); |
ab1bf971 DE |
613 | return -1; |
614 | } | |
615 | ||
616 | lxc_log_fd = log_open(fname); | |
617 | if (lxc_log_fd == -1) | |
618 | return -1; | |
619 | ||
620 | log_fname = strdup(fname); | |
621 | return 0; | |
622 | } | |
623 | ||
624 | static int _lxc_log_set_file(const char *name, const char *lxcpath, int create_dirs) | |
625 | { | |
626 | char *logfile; | |
627 | int ret; | |
628 | ||
629 | logfile = build_log_path(name, lxcpath); | |
630 | if (!logfile) { | |
7d204776 | 631 | ERROR("Could not build log path"); |
ab1bf971 DE |
632 | return -1; |
633 | } | |
202a334b | 634 | |
ab1bf971 DE |
635 | ret = __lxc_log_set_file(logfile, create_dirs); |
636 | free(logfile); | |
637 | return ret; | |
638 | } | |
5e1e7aaf | 639 | |
858377e4 SH |
640 | /* |
641 | * lxc_log_init: | |
642 | * Called from lxc front-end programs (like lxc-create, lxc-start) to | |
95db7d8c | 643 | * initialize the log defaults. |
858377e4 | 644 | */ |
202a334b | 645 | int lxc_log_init(struct lxc_log *log) |
cb8c5720 | 646 | { |
5e1e7aaf | 647 | int ret; |
202a334b | 648 | int lxc_priority = LXC_LOG_LEVEL_ERROR; |
51cab631 | 649 | |
03c6d266 | 650 | if (!log) |
651 | return -1; | |
652 | ||
ab1bf971 | 653 | if (lxc_log_fd != -1) { |
202a334b | 654 | WARN("Log already initialized"); |
2312f31b | 655 | return 0; |
ab1bf971 | 656 | } |
2312f31b | 657 | |
4b73005c CB |
658 | if (log->level) |
659 | lxc_priority = lxc_log_priority_to_int(log->level); | |
51cab631 | 660 | |
858377e4 SH |
661 | if (!lxc_loglevel_specified) { |
662 | lxc_log_category_lxc.priority = lxc_priority; | |
663 | lxc_loglevel_specified = 1; | |
664 | } | |
cb8c5720 | 665 | |
03c6d266 | 666 | if (!lxc_quiet_specified) |
73b910a3 | 667 | if (!log->quiet) |
01db0197 | 668 | lxc_log_category_lxc.appender->next = &log_appender_stderr; |
441e4963 | 669 | |
73b910a3 | 670 | if (log->prefix) |
671 | lxc_log_set_prefix(log->prefix); | |
74476cf1 | 672 | |
73b910a3 | 673 | if (log->name) |
674 | log_vmname = strdup(log->name); | |
64c57ea1 | 675 | |
73b910a3 | 676 | if (log->file) { |
677 | if (strcmp(log->file, "none") == 0) | |
ab1bf971 | 678 | return 0; |
202a334b | 679 | |
73b910a3 | 680 | ret = __lxc_log_set_file(log->file, 1); |
03c6d266 | 681 | if (ret < 0) { |
682 | ERROR("Failed to enable logfile"); | |
683 | return -1; | |
684 | } | |
685 | ||
858377e4 | 686 | lxc_log_use_global_fd = 1; |
5e1e7aaf | 687 | } else { |
74f052dd | 688 | /* if no name was specified, there nothing to do */ |
73b910a3 | 689 | if (!log->name) |
74f052dd SG |
690 | return 0; |
691 | ||
ab1bf971 DE |
692 | ret = -1; |
693 | ||
73b910a3 | 694 | if (!log->lxcpath) |
695 | log->lxcpath = LOGPATH; | |
e0b0b533 | 696 | |
361e0e3c | 697 | /* try LOGPATH if lxcpath is the default for the privileged containers */ |
73b910a3 | 698 | if (!geteuid() && strcmp(LXCPATH, log->lxcpath) == 0) |
699 | ret = _lxc_log_set_file(log->name, NULL, 0); | |
5e1e7aaf | 700 | |
ab1bf971 DE |
701 | /* try in lxcpath */ |
702 | if (ret < 0) | |
73b910a3 | 703 | ret = _lxc_log_set_file(log->name, log->lxcpath, 1); |
ab1bf971 DE |
704 | |
705 | /* try LOGPATH in case its writable by the caller */ | |
706 | if (ret < 0) | |
73b910a3 | 707 | ret = _lxc_log_set_file(log->name, NULL, 0); |
ab1bf971 | 708 | } |
5e1e7aaf | 709 | |
5e1e7aaf | 710 | /* |
ab1bf971 DE |
711 | * If !file, that is, if the user did not request this logpath, then |
712 | * ignore failures and continue logging to console | |
5e1e7aaf | 713 | */ |
73b910a3 | 714 | if (!log->file && ret != 0) { |
7d204776 | 715 | INFO("Ignoring failure to open default logfile"); |
5e1e7aaf SH |
716 | ret = 0; |
717 | } | |
718 | ||
03c6d266 | 719 | if (lxc_log_fd != -1) { |
720 | lxc_log_category_lxc.appender = &log_appender_logfile; | |
721 | lxc_log_category_lxc.appender->next = &log_appender_stderr; | |
722 | } | |
723 | ||
5e1e7aaf | 724 | return ret; |
cb8c5720 | 725 | } |
4a85ce2a | 726 | |
8273ba47 | 727 | void lxc_log_close(void) |
728 | { | |
729 | closelog(); | |
730 | ||
731 | free(log_vmname); | |
732 | log_vmname = NULL; | |
733 | ||
734 | if (lxc_log_fd == -1) | |
735 | return; | |
736 | ||
737 | close(lxc_log_fd); | |
738 | lxc_log_fd = -1; | |
739 | ||
740 | free(log_fname); | |
741 | log_fname = NULL; | |
742 | } | |
743 | ||
744 | int lxc_log_syslog(int facility) | |
745 | { | |
746 | struct lxc_log_appender *appender; | |
747 | ||
748 | openlog(log_prefix, LOG_PID, facility); | |
749 | if (!lxc_log_category_lxc.appender) { | |
750 | lxc_log_category_lxc.appender = &log_appender_syslog; | |
751 | return 0; | |
752 | } | |
753 | ||
754 | appender = lxc_log_category_lxc.appender; | |
755 | /* Check if syslog was already added, to avoid creating a loop */ | |
756 | while (appender) { | |
757 | if (appender == &log_appender_syslog) { | |
758 | /* not an error: openlog re-opened the connection */ | |
759 | return 0; | |
760 | } | |
761 | appender = appender->next; | |
762 | } | |
763 | ||
764 | appender = lxc_log_category_lxc.appender; | |
765 | while (appender->next != NULL) | |
766 | appender = appender->next; | |
767 | appender->next = &log_appender_syslog; | |
768 | ||
769 | return 0; | |
770 | } | |
771 | ||
772 | inline void lxc_log_enable_syslog(void) | |
773 | { | |
774 | syslog_enable = 1; | |
775 | } | |
776 | ||
4a85ce2a | 777 | /* |
46cc906d | 778 | * This is called when we read a lxc.log.level entry in a lxc.conf file. This |
4a85ce2a SH |
779 | * happens after processing command line arguments, which override the .conf |
780 | * settings. So only set the level if previously unset. | |
781 | */ | |
202a334b | 782 | int lxc_log_set_level(int *dest, int level) |
4a85ce2a | 783 | { |
4b73005c | 784 | if (level < 0 || level >= LXC_LOG_LEVEL_NOTSET) { |
7d204776 | 785 | ERROR("Invalid log priority %d", level); |
4a85ce2a SH |
786 | return -1; |
787 | } | |
7d204776 | 788 | |
858377e4 | 789 | *dest = level; |
4a85ce2a SH |
790 | return 0; |
791 | } | |
792 | ||
202a334b | 793 | inline int lxc_log_get_level(void) |
ab1bf971 | 794 | { |
ab1bf971 DE |
795 | return lxc_log_category_lxc.priority; |
796 | } | |
797 | ||
202a334b | 798 | bool lxc_log_has_valid_level(void) |
fabf7361 | 799 | { |
202a334b | 800 | int log_level; |
7d204776 | 801 | |
202a334b | 802 | log_level = lxc_log_get_level(); |
4b73005c | 803 | if (log_level < 0 || log_level >= LXC_LOG_LEVEL_NOTSET) |
fabf7361 | 804 | return false; |
7d204776 | 805 | |
fabf7361 QH |
806 | return true; |
807 | } | |
808 | ||
4a85ce2a | 809 | /* |
ab1bf971 DE |
810 | * This is called when we read a lxc.logfile entry in a lxc.conf file. This |
811 | * happens after processing command line arguments, which override the .conf | |
812 | * settings. So only set the file if previously unset. | |
4a85ce2a | 813 | */ |
202a334b | 814 | int lxc_log_set_file(int *fd, const char *fname) |
4a85ce2a | 815 | { |
202a334b | 816 | if (*fd >= 0) { |
858377e4 SH |
817 | close(*fd); |
818 | *fd = -1; | |
819 | } | |
820 | ||
202a334b | 821 | if (build_dir(fname)) |
858377e4 | 822 | return -1; |
858377e4 SH |
823 | |
824 | *fd = log_open(fname); | |
202a334b CB |
825 | if (*fd < 0) |
826 | return -1; | |
7d204776 | 827 | |
858377e4 | 828 | return 0; |
4a85ce2a | 829 | } |
9ea87d5d | 830 | |
202a334b | 831 | inline const char *lxc_log_get_file(void) |
5e1e7aaf | 832 | { |
ab1bf971 | 833 | return log_fname; |
5e1e7aaf SH |
834 | } |
835 | ||
202a334b | 836 | inline void lxc_log_set_prefix(const char *prefix) |
9ea87d5d | 837 | { |
6333c915 | 838 | /* We don't care if the prefix is truncated. */ |
9de31d5a | 839 | (void)strlcpy(log_prefix, prefix, sizeof(log_prefix)); |
9ea87d5d SH |
840 | } |
841 | ||
202a334b | 842 | inline const char *lxc_log_get_prefix(void) |
9ea87d5d | 843 | { |
ab1bf971 | 844 | return log_prefix; |
9ea87d5d | 845 | } |
6edbfc86 | 846 | |
202a334b | 847 | inline void lxc_log_options_no_override() |
6edbfc86 | 848 | { |
01db0197 | 849 | lxc_quiet_specified = 1; |
858377e4 | 850 | lxc_loglevel_specified = 1; |
6edbfc86 | 851 | } |