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/* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The ASF licenses this file to You under the Apache License, Version 2.0
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* (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.apache.org/licenses/LICENSE-2.0
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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* Simple program to rotate Apache logs without having to kill the server.
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* Contributed by Ben Laurie <ben algroup.co.uk>
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* Ported to APR by Mladen Turk <mturk mappingsoft.com>
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* -l option added 2004-06-11
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* -l causes the use of local time rather than GMT as the base for the
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* interval. NB: Using -l in an environment which changes the GMT offset
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* (such as for BST or DST) can lead to unpredictable results!
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#include "apr_strings.h"
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#include "apr_errno.h"
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#include "apr_file_io.h"
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#include "apr_file_info.h"
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#include "apr_general.h"
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#if APR_HAVE_STRINGS_H
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int main (int argc, const char * const argv[])
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char buf[BUFSIZE], buf2[MAX_PATH], errbuf[ERRMSGSZ];
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int tLogEnd = 0, tRotation = 0, utc_offset = 0;
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unsigned int sRotation = 0;
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apr_size_t nRead, nWrite;
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int use_localtime = 0;
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const char *szLogRoot;
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apr_file_t *f_stdin, *nLogFD = NULL, *nLogFDprev = NULL;
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apr_app_initialize(&argc, &argv, NULL);
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atexit(apr_terminate);
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apr_pool_create(&pool, NULL);
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if ((argc > 2) && (strcmp(argv[1], "-l") == 0)) {
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if (argc < (argBase + 3) || argc > (argBase + 4)) {
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"Usage: %s [-l] <logfile> <rotation time in seconds> "
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"[offset minutes from UTC] or <rotation size in megabytes>\n\n",
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"Add this:\n\nTransferLog \"|%s.exe /some/where 86400\"\n\n",
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"Add this:\n\nTransferLog \"|%s /some/where 86400\"\n\n",
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"or \n\nTransferLog \"|%s /some/where 5M\"\n\n", argv[0]);
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"to httpd.conf. The generated name will be /some/where.nnnn "
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"where nnnn is the\nsystem time at which the log nominally "
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"starts (N.B. if using a rotation time,\nthe time will always "
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"be a multiple of the rotation time, so you can synchronize\n"
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"cron scripts with it). At the end of each rotation time or "
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"when the file size\nis reached a new log is started.\n");
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szLogRoot = argv[argFile];
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ptr = strchr(argv[argIntv], 'M');
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if (*(ptr+1) == '\0') {
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sRotation = atoi(argv[argIntv]) * 1048576;
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if (sRotation == 0) {
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fprintf(stderr, "Invalid rotation size parameter\n");
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if (argc >= (argBase + 4)) {
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utc_offset = atoi(argv[argOffset]) * 60;
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tRotation = atoi(argv[argIntv]);
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if (tRotation <= 0) {
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fprintf(stderr, "Rotation time must be > 0\n");
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use_strftime = (strchr(szLogRoot, '%') != NULL);
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if (apr_file_open_stdin(&f_stdin, pool) != APR_SUCCESS) {
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fprintf(stderr, "Unable to open stdin\n");
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if (apr_file_read(f_stdin, buf, &nRead) != APR_SUCCESS) {
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* Check for our UTC offset every time through the loop, since
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* it might change if there's a switch between standard and
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* daylight savings time.
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apr_time_exp_lt(<, apr_time_now());
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utc_offset = lt.tm_gmtoff;
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now = (int)(apr_time_now() / APR_USEC_PER_SEC) + utc_offset;
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if (nLogFD != NULL && now >= tLogEnd) {
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else if (sRotation) {
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apr_off_t current_size = -1;
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if ((nLogFD != NULL) &&
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(apr_file_info_get(&finfo, APR_FINFO_SIZE, nLogFD) == APR_SUCCESS)) {
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current_size = finfo.size;
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if (current_size > sRotation) {
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fprintf(stderr, "No rotation time or size specified\n");
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if (nLogFD == NULL) {
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tLogStart = (now / tRotation) * tRotation;
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tLogStart = (int)apr_time_sec(apr_time_now());
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apr_time_t tNow = apr_time_from_sec(tLogStart);
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apr_time_exp_gmt(&e, tNow);
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apr_strftime(buf2, &rs, sizeof(buf2), szLogRoot, &e);
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sprintf(buf2, "%s.%010d", szLogRoot, tLogStart);
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tLogEnd = tLogStart + tRotation;
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apr_file_open(&nLogFD, buf2, APR_READ | APR_WRITE | APR_CREATE | APR_APPEND,
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APR_OS_DEFAULT, pool);
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if (nLogFD == NULL) {
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/* Uh-oh. Failed to open the new log file. Try to clear
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* the previous log file, note the lost log entries,
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* and keep on truckin'. */
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if (nLogFDprev == NULL) {
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fprintf(stderr, "1 Previous file handle doesn't exists %s\n", buf2);
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"Resetting log file due to error opening "
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"new log file. %10d messages lost.\n",
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nWrite = strlen(errbuf);
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apr_file_trunc(nLogFD, 0);
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if (apr_file_write(nLogFD, errbuf, &nWrite) != APR_SUCCESS) {
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fprintf(stderr, "Error writing to the file %s\n", buf2);
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else if (nLogFDprev) {
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apr_file_close(nLogFDprev);
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apr_file_write(nLogFD, buf, &nWrite);
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if (nWrite != nRead) {
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"Error writing to log file. "
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"%10d messages lost.\n",
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nWrite = strlen(errbuf);
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apr_file_trunc(nLogFD, 0);
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if (apr_file_write(nLogFD, errbuf, &nWrite) != APR_SUCCESS) {
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fprintf(stderr, "Error writing to the file %s\n", buf2);
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/* Of course we never, but prevent compiler warnings */