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"
55 #define APR_WANT_STRFUNC
69 #define ROTATE_FORCE 4
71 static const char *ROTATE_REASONS[] = {
74 "Time interval expired",
75 "Maximum size reached",
80 typedef struct rotate_config rotate_config_t;
82 struct rotate_config {
83 unsigned int sRotation;
90 const char *szLogRoot;
93 typedef struct rotate_status rotate_status_t;
95 struct rotate_status {
98 apr_pool_t *pfile_prev;
100 apr_file_t *nLogFDprev;
101 char filename[MAX_PATH];
102 char errbuf[ERRMSGSZ];
108 static rotate_config_t config;
109 static rotate_status_t status;
111 static void usage(const char *argv0, const char *reason)
114 fprintf(stderr, "%s\n", reason);
117 "Usage: %s [-v] [-l] [-f] <logfile> "
118 "{<rotation time in seconds>|<rotation size>(B|K|M|G)} "
119 "[offset minutes from UTC]\n\n",
123 "Add this:\n\nTransferLog \"|%s.exe /some/where 86400\"\n\n",
127 "Add this:\n\nTransferLog \"|%s /some/where 86400\"\n\n",
130 "or \n\nTransferLog \"|%s /some/where 5M\"\n\n", argv0);
133 "to httpd.conf. The generated name will be /some/where.nnnn "
134 "where nnnn is the\nsystem time at which the log nominally "
135 "starts (N.B. if using a rotation time,\nthe time will always "
136 "be a multiple of the rotation time, so you can synchronize\n"
137 "cron scripts with it). At the end of each rotation time or "
138 "when the file size\nis reached a new log is started.\n");
143 * Get the unix time with timezone corrections
144 * given in the config struct.
146 static int get_now(rotate_config_t *config)
148 apr_time_t tNow = apr_time_now();
149 int utc_offset = config->utc_offset;
150 if (config->use_localtime) {
151 /* Check for our UTC offset before using it, since it might
152 * change if there's a switch between standard and daylight
156 apr_time_exp_lt(<, tNow);
157 utc_offset = lt.tm_gmtoff;
159 return (int)apr_time_sec(tNow) + utc_offset;
163 * Close a file and destroy the associated pool.
165 static void closeFile(rotate_config_t *config, apr_pool_t *pool, apr_file_t *file)
168 if (config->verbose) {
170 apr_int32_t wanted = APR_FINFO_NAME;
171 if (apr_file_info_get(&finfo, wanted, file) == APR_SUCCESS) {
172 fprintf(stderr, "Closing file %s (%s)\n", finfo.name, finfo.fname);
175 apr_file_close(file);
177 apr_pool_destroy(pool);
183 * Dump the configuration parsing result to STDERR.
185 static void dumpConfig (rotate_config_t *config)
187 fprintf(stderr, "Rotation time interval: %12d\n", config->tRotation);
188 fprintf(stderr, "Rotation size interval: %12d\n", config->sRotation);
189 fprintf(stderr, "Rotation time UTC offset: %12d\n", config->utc_offset);
190 fprintf(stderr, "Rotation based on localtime: %12s\n", config->use_localtime ? "yes" : "no");
191 fprintf(stderr, "Rotation file date pattern: %12s\n", config->use_strftime ? "yes" : "no");
192 fprintf(stderr, "Rotation file forced open: %12s\n", config->force_open ? "yes" : "no");
193 fprintf(stderr, "Rotation verbose: %12s\n", config->verbose ? "yes" : "no");
194 fprintf(stderr, "Rotation file name: %21s\n", config->szLogRoot);
198 * Check whether we need to rotate.
199 * Possible reasons are:
200 * - No log file open (ROTATE_NEW)
201 * - User forces us to rotate (ROTATE_FORCE)
202 * - Our log file size is already bigger than the
203 * allowed maximum (ROTATE_SIZE)
204 * - The next log time interval expired (ROTATE_TIME)
206 * When size and time constraints are both given,
207 * it suffices that one of them is fulfilled.
209 static void checkRotate(rotate_config_t *config, rotate_status_t *status)
212 if (status->nLogFD == NULL) {
213 status->rotateReason = ROTATE_NEW;
215 else if (config->sRotation) {
217 apr_off_t current_size = -1;
219 if (apr_file_info_get(&finfo, APR_FINFO_SIZE, status->nLogFD) == APR_SUCCESS) {
220 current_size = finfo.size;
223 if (current_size > config->sRotation) {
224 status->rotateReason = ROTATE_SIZE;
226 else if (config->tRotation) {
227 if (get_now(config) >= status->tLogEnd) {
228 status->rotateReason = ROTATE_TIME;
232 else if (config->tRotation) {
233 if (get_now(config) >= status->tLogEnd) {
234 status->rotateReason = ROTATE_TIME;
238 fprintf(stderr, "No rotation time or size specified\n");
242 if (status->rotateReason != ROTATE_NONE && config->verbose) {
243 fprintf(stderr, "File rotation needed, reason: %s\n", ROTATE_REASONS[status->rotateReason]);
250 * Open a new log file, and if successful
251 * also close the old one.
253 * The timestamp for the calculation of the file
254 * name of the new log file will be the actual millisecond
255 * timestamp, except when a regular rotation based on a time
256 * interval is configured and the previous interval
257 * is over. Then the timestamp is the starting time
258 * of the actual interval.
260 static void doRotate(rotate_config_t *config, rotate_status_t *status)
263 int now = get_now(config);
267 status->rotateReason = ROTATE_NONE;
268 status->nLogFDprev = status->nLogFD;
269 status->nLogFD = NULL;
270 status->pfile_prev = status->pfile;
272 if (config->tRotation) {
274 tLogStart = (now / config->tRotation) * config->tRotation;
275 tLogEnd = tLogStart + config->tRotation;
277 * Check if rotation was forced and the last rotation
278 * interval is not yet over. Use the value of now instead
279 * of the time interval boundary for the file name then.
281 if (tLogStart < status->tLogEnd) {
284 status->tLogEnd = tLogEnd;
290 if (config->use_strftime) {
291 apr_time_t tNow = apr_time_from_sec(tLogStart);
295 apr_time_exp_gmt(&e, tNow);
296 apr_strftime(status->filename, &rs, sizeof(status->filename), config->szLogRoot, &e);
299 sprintf(status->filename, "%s.%010d", config->szLogRoot, tLogStart);
301 apr_pool_create(&status->pfile, status->pool);
302 if (config->verbose) {
303 fprintf(stderr, "Opening file %s\n", status->filename);
305 rv = apr_file_open(&status->nLogFD, status->filename, APR_WRITE | APR_CREATE | APR_APPEND,
306 APR_OS_DEFAULT, status->pfile);
307 if (rv != APR_SUCCESS) {
310 apr_strerror(rv, error, sizeof error);
312 /* Uh-oh. Failed to open the new log file. Try to clear
313 * the previous log file, note the lost log entries,
314 * and keep on truckin'. */
315 if (status->nLogFDprev == NULL) {
316 fprintf(stderr, "Could not open log file '%s' (%s)\n", status->filename, error);
321 status->nLogFD = status->nLogFDprev;
322 apr_pool_destroy(status->pfile);
323 status->pfile = status->pfile_prev;
324 /* Try to keep this error message constant length
325 * in case it occurs several times. */
326 apr_snprintf(status->errbuf, sizeof status->errbuf,
327 "Resetting log file due to error opening "
328 "new log file, %10d messages lost: %-25.25s\n",
329 status->nMessCount, error);
330 nWrite = strlen(status->errbuf);
331 apr_file_trunc(status->nLogFD, 0);
332 if (apr_file_write(status->nLogFD, status->errbuf, &nWrite) != APR_SUCCESS) {
333 fprintf(stderr, "Error writing to the file %s\n", status->filename);
339 closeFile(config, status->pfile_prev, status->nLogFDprev);
340 status->nLogFDprev = NULL;
341 status->pfile_prev = NULL;
343 status->nMessCount = 0;
347 * Get a size or time param from a string.
348 * Parameter 'last' indicates, whether the
349 * argument is the last commadnline argument.
350 * UTC offset is only allowed as a last argument
351 * in order to make is distinguishable from the
352 * rotation interval time.
354 static const char *get_time_or_size(rotate_config_t *config,
355 const char *arg, int last) {
357 /* Byte multiplier */
358 unsigned int mult = 1;
359 if ((ptr = strchr(arg, 'B')) != NULL) { /* Found KB size */
362 else if ((ptr = strchr(arg, 'K')) != NULL) { /* Found KB size */
365 else if ((ptr = strchr(arg, 'M')) != NULL) { /* Found MB size */
368 else if ((ptr = strchr(arg, 'G')) != NULL) { /* Found GB size */
369 mult = 1024 * 1024 * 1024;
371 if (ptr) { /* rotation based on file size */
372 if (config->sRotation > 0) {
373 return "Rotation size parameter allowed only once";
375 if (*(ptr+1) == '\0') {
376 config->sRotation = atoi(arg) * mult;
378 if (config->sRotation == 0) {
379 return "Invalid rotation size parameter";
382 else if ((config->sRotation > 0 || config->tRotation > 0) && last) {
383 /* rotation based on elapsed time */
384 if (config->use_localtime) {
385 return "UTC offset parameter is not valid with -l";
387 config->utc_offset = atoi(arg) * 60;
389 else { /* rotation based on elapsed time */
390 if (config->tRotation > 0) {
391 return "Rotation time parameter allowed only once";
393 config->tRotation = atoi(arg);
394 if (config->tRotation <= 0) {
395 return "Invalid rotation time parameter";
401 int main (int argc, const char * const argv[])
404 apr_size_t nRead, nWrite;
410 const char *err = NULL;
412 apr_app_initialize(&argc, &argv, NULL);
413 atexit(apr_terminate);
415 config.sRotation = 0;
416 config.tRotation = 0;
417 config.utc_offset = 0;
418 config.use_localtime = 0;
419 config.use_strftime = 0;
420 config.force_open = 0;
424 status.pfile_prev = NULL;
425 status.nLogFD = NULL;
426 status.nLogFDprev = NULL;
428 status.rotateReason = ROTATE_NONE;
429 status.nMessCount = 0;
431 apr_pool_create(&status.pool, NULL);
432 apr_getopt_init(&opt, status.pool, argc, argv);
433 while ((rv = apr_getopt(opt, "lfv", &c, &optarg)) == APR_SUCCESS) {
436 config.use_localtime = 1;
439 config.force_open = 1;
448 usage(argv[0], NULL /* specific error message already issued */ );
452 * After the initial flags we need 2 to 4 arguments,
453 * the file name, either the rotation interval time or size
454 * or both of them, and optionally the UTC offset.
456 if ((argc - opt->ind < 2) || (argc - opt->ind > 4) ) {
457 usage(argv[0], "Incorrect number of arguments");
460 config.szLogRoot = argv[opt->ind++];
462 /* Read in the remaining flags, namely time, size and UTC offset. */
463 for(; opt->ind < argc; opt->ind++) {
464 if ((err = get_time_or_size(&config, argv[opt->ind],
465 opt->ind < argc - 1 ? 0 : 1)) != NULL) {
470 config.use_strftime = (strchr(config.szLogRoot, '%') != NULL);
472 if (apr_file_open_stdin(&f_stdin, status.pool) != APR_SUCCESS) {
473 fprintf(stderr, "Unable to open stdin\n");
478 * Write out result of config parsing if verbose is set.
480 if (config.verbose) {
485 * Immediately open the logfile as we start, if we were forced
488 if (config.force_open) {
489 doRotate(&config, &status);
494 rv = apr_file_read(f_stdin, buf, &nRead);
495 if (rv != APR_SUCCESS) {
498 checkRotate(&config, &status);
499 if (status.rotateReason != ROTATE_NONE) {
500 doRotate(&config, &status);
504 rv = apr_file_write(status.nLogFD, buf, &nWrite);
505 if (rv == APR_SUCCESS && nWrite != nRead) {
506 /* buffer partially written, which for rotatelogs means we encountered
507 * an error such as out of space or quota or some other limit reached;
508 * try to write the rest so we get the real error code
510 apr_size_t nWritten = nWrite;
512 nRead = nRead - nWritten;
514 rv = apr_file_write(status.nLogFD, buf + nWritten, &nWrite);
516 if (nWrite != nRead) {
518 apr_off_t cur_offset;
521 if (apr_file_seek(status.nLogFD, APR_CUR, &cur_offset) != APR_SUCCESS) {
524 apr_strerror(rv, strerrbuf, sizeof strerrbuf);
526 apr_snprintf(status.errbuf, sizeof status.errbuf,
527 "Error %d writing to log file at offset %" APR_OFF_T_FMT ". "
528 "%10d messages lost (%s)\n",
529 rv, cur_offset, status.nMessCount, strerrbuf);
530 nWrite = strlen(status.errbuf);
531 apr_file_trunc(status.nLogFD, 0);
532 if (apr_file_write(status.nLogFD, status.errbuf, &nWrite) != APR_SUCCESS) {
533 fprintf(stderr, "Error writing to the file %s\n", status.filename);
541 /* Of course we never, but prevent compiler warnings */