1 /* Licensed to the Apache Software Foundation (ASF) under one or more
2 * contributor license agreements. See the NOTICE file distributed with
3 * this work for additional information regarding copyright ownership.
4 * The ASF licenses this file to You under the Apache License, Version 2.0
5 * (the "License"); you may not use this file except in compliance with
6 * the License. You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
18 * Simple program to rotate Apache logs without having to kill the server.
20 * Contributed by Ben Laurie <ben algroup.co.uk>
24 * Ported to APR by Mladen Turk <mturk mappingsoft.com>
28 * -l option added 2004-06-11
30 * -l causes the use of local time rather than GMT as the base for the
31 * interval. NB: Using -l in an environment which changes the GMT offset
32 * (such as for BST or DST) can lead to unpredictable results!
34 * -f option added Feb, 2008. This causes rotatelog to open/create
35 * the logfile as soon as it's started, not as soon as it sees
38 * -v option added Feb, 2008. Verbose output of command line parsing.
44 #include "apr_strings.h"
45 #include "apr_errno.h"
46 #include "apr_file_io.h"
47 #include "apr_file_info.h"
48 #include "apr_general.h"
50 #include "apr_getopt.h"
51 #include "apr_signal.h"
56 #define APR_WANT_STRFUNC
68 #define HAVE_SIGNALS 1
69 #define SIG_CHECK SIGHUP
70 #define SIG_FORCE SIGINT
75 #define CHECK_SIG_CHECK 1
76 #define CHECK_SIG_FORCE 2
82 #define ROTATE_FORCE 4
84 static const char *ROTATE_REASONS[] = {
87 "Time interval expired",
88 "Maximum size reached",
93 typedef struct rotate_config rotate_config_t;
95 struct rotate_config {
96 unsigned int sRotation;
103 const char *szLogRoot;
106 typedef struct rotate_status rotate_status_t;
108 struct rotate_status {
111 apr_pool_t *pfile_prev;
113 apr_file_t *nLogFDprev;
114 char filename[MAX_PATH];
115 char errbuf[ERRMSGSZ];
122 static rotate_config_t config;
123 static rotate_status_t status;
125 static void usage(const char *argv0, const char *reason)
128 fprintf(stderr, "%s\n", reason);
131 "Usage: %s [-v] [-l] [-f] <logfile> "
132 "{<rotation time in seconds>|<rotation size in megabytes>} "
133 "[offset minutes from UTC]\n\n",
137 "Add this:\n\nTransferLog \"|%s.exe /some/where 86400\"\n\n",
141 "Add this:\n\nTransferLog \"|%s /some/where 86400\"\n\n",
144 "or \n\nTransferLog \"|%s /some/where 5M\"\n\n", argv0);
147 "to httpd.conf. The generated name will be /some/where.nnnn "
148 "where nnnn is the\nsystem time at which the log nominally "
149 "starts (N.B. if using a rotation time,\nthe time will always "
150 "be a multiple of the rotation time, so you can synchronize\n"
151 "cron scripts with it). At the end of each rotation time or "
152 "when the file size\nis reached a new log is started.\n");
157 * Get the unix time with timezone corrections
158 * given in the config struct.
160 static int get_now(rotate_config_t *config)
162 apr_time_t tNow = apr_time_now();
163 int utc_offset = config->utc_offset;
164 if (config->use_localtime) {
165 /* Check for our UTC offset before using it, since it might
166 * change if there's a switch between standard and daylight
170 apr_time_exp_lt(<, tNow);
171 utc_offset = lt.tm_gmtoff;
173 return (int)apr_time_sec(tNow) + utc_offset;
177 * Close a file and destroy the associated pool.
179 static void closeFile(rotate_config_t *config, apr_pool_t *pool, apr_file_t *file)
182 if (config->verbose) {
184 apr_int32_t wanted = APR_FINFO_NAME;
185 if (apr_file_info_get(&finfo, wanted, file) == APR_SUCCESS) {
186 fprintf(stderr, "Closing file %s (%s)\n", finfo.name, finfo.fname);
189 apr_file_close(file);
191 apr_pool_destroy(pool);
197 * Dump the configuration parsing result to STDERR.
199 static void dumpConfig (rotate_config_t *config)
201 fprintf(stderr, "Rotation time interval: %12d\n", config->tRotation);
202 fprintf(stderr, "Rotation size interval: %12d\n", config->sRotation);
203 fprintf(stderr, "Rotation time UTC offset: %12d\n", config->utc_offset);
204 fprintf(stderr, "Rotation based on localtime: %12s\n", config->use_localtime ? "yes" : "no");
205 fprintf(stderr, "Rotation file date pattern: %12s\n", config->use_strftime ? "yes" : "no");
206 fprintf(stderr, "Rotation file forced open: %12s\n", config->force_open ? "yes" : "no");
207 fprintf(stderr, "Rotation verbose: %12s\n", config->verbose ? "yes" : "no");
208 fprintf(stderr, "Rotation file name: %21s\n", config->szLogRoot);
212 * Check whether we need to rotate.
213 * Possible reasons are:
214 * - No log file open (ROTATE_NEW)
215 * - User forces us to rotate (ROTATE_FORCE)
216 * - Our log file size is already bigger than the
217 * allowed maximum (ROTATE_SIZE)
218 * - The next log time interval expired (ROTATE_TIME)
220 * When size and time constraints are both given,
221 * it suffices that one of them is fulfilled.
223 * If the method finds a reason for rotation,
224 * and it hasn't been called while log data is available,
225 * it will close the open log file as a side effect.
227 static void checkRotate(rotate_config_t *config, rotate_status_t *status)
230 if (status->nLogFD == NULL) {
231 status->rotateReason = ROTATE_NEW;
233 else if (status->checkReason == CHECK_SIG_FORCE) {
234 status->rotateReason = ROTATE_FORCE;
236 else if (config->sRotation) {
238 apr_off_t current_size = -1;
240 if (apr_file_info_get(&finfo, APR_FINFO_SIZE, status->nLogFD) == APR_SUCCESS) {
241 current_size = finfo.size;
244 if (current_size > config->sRotation) {
245 status->rotateReason = ROTATE_SIZE;
247 else if (config->tRotation) {
248 if (get_now(config) >= status->tLogEnd) {
249 status->rotateReason = ROTATE_TIME;
253 else if (config->tRotation) {
254 if (get_now(config) >= status->tLogEnd) {
255 status->rotateReason = ROTATE_TIME;
259 fprintf(stderr, "No rotation time or size specified\n");
263 if (status->rotateReason != ROTATE_NONE && config->verbose) {
264 fprintf(stderr, "File rotation needed, reason: %s\n", ROTATE_REASONS[status->rotateReason]);
268 * Let's close the file before immediately
269 * if we got here via a signal.
271 if ((status->rotateReason != ROTATE_NONE) &&
272 (status->checkReason != CHECK_LOG)) {
273 closeFile(config, status->pfile, status->nLogFD);
274 status->nLogFD = NULL;
275 status->pfile = NULL;
281 * Open a new log file, and if successful
282 * also close the old one.
284 * The timestamp for the calculation of the file
285 * name of the new log file will be the actual millisecond
286 * timestamp, except when a regular rotation based on a time
287 * interval is configured and the previous interval
288 * is over. Then the timestamp is the starting time
289 * of the actual interval.
291 static void doRotate(rotate_config_t *config, rotate_status_t *status)
294 int now = get_now(config);
298 status->rotateReason = ROTATE_NONE;
299 status->nLogFDprev = status->nLogFD;
300 status->nLogFD = NULL;
301 status->pfile_prev = status->pfile;
303 if (config->tRotation) {
305 tLogStart = (now / config->tRotation) * config->tRotation;
306 tLogEnd = tLogStart + config->tRotation;
308 * Check if rotation was forced and the last rotation
309 * interval is not yet over. Use the value of now instead
310 * of the time interval boundary for the file name then.
312 if (tLogStart < status->tLogEnd) {
315 status->tLogEnd = tLogEnd;
321 if (config->use_strftime) {
322 apr_time_t tNow = apr_time_from_sec(tLogStart);
326 apr_time_exp_gmt(&e, tNow);
327 apr_strftime(status->filename, &rs, sizeof(status->filename), config->szLogRoot, &e);
330 sprintf(status->filename, "%s.%010d", config->szLogRoot, tLogStart);
332 apr_pool_create(&status->pfile, status->pool);
333 if (config->verbose) {
334 fprintf(stderr, "Opening file %s\n", status->filename);
336 rv = apr_file_open(&status->nLogFD, status->filename, APR_WRITE | APR_CREATE | APR_APPEND,
337 APR_OS_DEFAULT, status->pfile);
338 if (rv != APR_SUCCESS) {
341 apr_strerror(rv, error, sizeof error);
343 /* Uh-oh. Failed to open the new log file. Try to clear
344 * the previous log file, note the lost log entries,
345 * and keep on truckin'. */
346 if (status->nLogFDprev == NULL) {
347 fprintf(stderr, "Could not open log file '%s' (%s)\n", status->filename, error);
352 status->nLogFD = status->nLogFDprev;
353 apr_pool_destroy(status->pfile);
354 status->pfile = status->pfile_prev;
355 /* Try to keep this error message constant length
356 * in case it occurs several times. */
357 apr_snprintf(status->errbuf, sizeof status->errbuf,
358 "Resetting log file due to error opening "
359 "new log file, %10d messages lost: %-25.25s\n",
360 status->nMessCount, error);
361 nWrite = strlen(status->errbuf);
362 apr_file_trunc(status->nLogFD, 0);
363 if (apr_file_write(status->nLogFD, status->errbuf, &nWrite) != APR_SUCCESS) {
364 fprintf(stderr, "Error writing to the file %s\n", status->filename);
370 closeFile(config, status->pfile_prev, status->nLogFDprev);
371 status->nLogFDprev = NULL;
372 status->pfile_prev = NULL;
374 status->nMessCount = 0;
376 * Reset marker for signal triggered rotation
378 status->checkReason = CHECK_LOG;
383 * called on SIG_CHECK and SIG_FORCE
385 static void external_rotate(int signal)
388 * Set marker for signal triggered rotation check
390 if (signal == SIG_FORCE) {
391 status.checkReason = CHECK_SIG_FORCE;
394 status.checkReason = CHECK_SIG_CHECK;
397 * Close old file conditionally
399 checkRotate(&config, &status);
401 * Open new file if force flag was set
403 if (config.force_open && (status.rotateReason != ROTATE_NONE)) {
404 doRotate(&config, &status);
410 * Get a size or time param from a string.
411 * Parameter 'last' indicates, whether the
412 * argument is the last commadnline argument.
413 * UTC offset is only allowed as a last argument
414 * in order to make is distinguishable from the
415 * rotation interval time.
417 static const char *get_time_or_size(rotate_config_t *config,
418 const char *arg, int last) {
420 /* Byte multiplier */
421 unsigned int mult = 1;
422 if ((ptr = strchr(arg, 'B')) != NULL) { /* Found KB size */
425 else if ((ptr = strchr(arg, 'K')) != NULL) { /* Found KB size */
428 else if ((ptr = strchr(arg, 'M')) != NULL) { /* Found MB size */
431 else if ((ptr = strchr(arg, 'G')) != NULL) { /* Found GB size */
432 mult = 1024 * 1024 * 1024;
434 if (ptr) { /* rotation based on file size */
435 if (config->sRotation > 0) {
436 return "Rotation size parameter allowed only once";
438 if (*(ptr+1) == '\0') {
439 config->sRotation = atoi(arg) * mult;
441 if (config->sRotation == 0) {
442 return "Invalid rotation size parameter";
445 else if ((config->sRotation > 0 || config->tRotation > 0) && last) {
446 /* rotation based on elapsed time */
447 if (config->use_localtime) {
448 return "UTC offset parameter is not valid with -l";
450 config->utc_offset = atoi(arg) * 60;
452 else { /* rotation based on elapsed time */
453 if (config->tRotation > 0) {
454 return "Rotation time parameter allowed only once";
456 config->tRotation = atoi(arg);
457 if (config->tRotation <= 0) {
458 return "Invalid rotation time parameter";
464 int main (int argc, const char * const argv[])
467 apr_size_t nRead, nWrite;
473 const char *err = NULL;
475 apr_app_initialize(&argc, &argv, NULL);
476 atexit(apr_terminate);
478 config.sRotation = 0;
479 config.tRotation = 0;
480 config.utc_offset = 0;
481 config.use_localtime = 0;
482 config.use_strftime = 0;
483 config.force_open = 0;
487 status.pfile_prev = NULL;
488 status.nLogFD = NULL;
489 status.nLogFDprev = NULL;
491 status.rotateReason = ROTATE_NONE;
492 status.checkReason = CHECK_LOG;
493 status.nMessCount = 0;
495 apr_pool_create(&status.pool, NULL);
496 apr_getopt_init(&opt, status.pool, argc, argv);
497 while ((rv = apr_getopt(opt, "lfv", &c, &optarg)) == APR_SUCCESS) {
500 config.use_localtime = 1;
503 config.force_open = 1;
512 usage(argv[0], NULL /* specific error message already issued */ );
516 * After the initial flags we need 2 to 4 arguments,
517 * the file name, either the rotation interval time or size
518 * or both of them, and optionally the UTC offset.
520 if ((argc - opt->ind < 2) || (argc - opt->ind > 4) ) {
521 usage(argv[0], "Incorrect number of arguments");
524 config.szLogRoot = argv[opt->ind++];
526 /* Read in the remaining flags, namely time, size and UTC offset. */
527 for(; opt->ind < argc; opt->ind++) {
528 if ((err = get_time_or_size(&config, argv[opt->ind],
529 opt->ind < argc - 1 ? 0 : 1)) != NULL) {
534 config.use_strftime = (strchr(config.szLogRoot, '%') != NULL);
536 if (apr_file_open_stdin(&f_stdin, status.pool) != APR_SUCCESS) {
537 fprintf(stderr, "Unable to open stdin\n");
542 * Write out result of config parsing if verbose is set.
544 if (config.verbose) {
549 * Immediately open the logfile as we start, if we were forced
552 if (config.force_open) {
553 doRotate(&config, &status);
557 apr_signal(SIG_CHECK, external_rotate);
558 apr_signal(SIG_FORCE, external_rotate);
564 apr_signal_unblock(SIG_CHECK);
565 apr_signal_unblock(SIG_FORCE);
567 rv = apr_file_read(f_stdin, buf, &nRead);
569 apr_signal_block(SIG_FORCE);
570 apr_signal_block(SIG_CHECK);
572 if (rv != APR_SUCCESS) {
575 checkRotate(&config, &status);
576 if (status.rotateReason != ROTATE_NONE) {
577 doRotate(&config, &status);
581 rv = apr_file_write(status.nLogFD, buf, &nWrite);
582 if (rv == APR_SUCCESS && nWrite != nRead) {
583 /* buffer partially written, which for rotatelogs means we encountered
584 * an error such as out of space or quota or some other limit reached;
585 * try to write the rest so we get the real error code
587 apr_size_t nWritten = nWrite;
589 nRead = nRead - nWritten;
591 rv = apr_file_write(status.nLogFD, buf + nWritten, &nWrite);
593 if (nWrite != nRead) {
595 apr_off_t cur_offset;
598 if (apr_file_seek(status.nLogFD, APR_CUR, &cur_offset) != APR_SUCCESS) {
601 apr_strerror(rv, strerrbuf, sizeof strerrbuf);
603 apr_snprintf(status.errbuf, sizeof status.errbuf,
604 "Error %d writing to log file at offset %" APR_OFF_T_FMT ". "
605 "%10d messages lost (%s)\n",
606 rv, cur_offset, status.nMessCount, strerrbuf);
607 nWrite = strlen(status.errbuf);
608 apr_file_trunc(status.nLogFD, 0);
609 if (apr_file_write(status.nLogFD, status.errbuf, &nWrite) != APR_SUCCESS) {
610 fprintf(stderr, "Error writing to the file %s\n", status.filename);
618 /* Of course we never, but prevent compiler warnings */