rotatelogs.c revision 62cd2833e1fc0f71de15c9f493a2025dad81dc72
/* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* Simple program to rotate Apache logs without having to kill the server.
*
* Contributed by Ben Laurie <ben algroup.co.uk>
*
* 12 Mar 1996
*
* Ported to APR by Mladen Turk <mturk mappingsoft.com>
*
* 23 Sep 2001
*
* -l option added 2004-06-11
*
* -l causes the use of local time rather than GMT as the base for the
* interval. NB: Using -l in an environment which changes the GMT offset
* (such as for BST or DST) can lead to unpredictable results!
*
*/
#include "apr.h"
#include "apr_lib.h"
#include "apr_strings.h"
#include "apr_errno.h"
#include "apr_file_io.h"
#include "apr_file_info.h"
#include "apr_general.h"
#include "apr_time.h"
#if APR_HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if APR_HAVE_STRING_H
#include <string.h>
#endif
#if APR_HAVE_STRINGS_H
#include <strings.h>
#endif
#define BUFSIZE 65536
#define ERRMSGSZ 128
#ifndef MAX_PATH
#define MAX_PATH 1024
#endif
int main (int argc, const char * const argv[])
{
char buf[BUFSIZE], buf2[MAX_PATH], errbuf[ERRMSGSZ];
int tLogEnd = 0, tRotation = 0, utc_offset = 0;
unsigned int sRotation = 0;
int nMessCount = 0;
apr_size_t nRead, nWrite;
int use_strftime = 0;
int use_localtime = 0;
int now = 0;
const char *szLogRoot;
apr_file_t *f_stdin, *nLogFD = NULL, *nLogFDprev = NULL;
apr_pool_t *pool;
char *ptr = NULL;
int argBase = 0;
int argFile = 1;
int argIntv = 2;
int argOffset = 3;
apr_app_initialize(&argc, &argv, NULL);
atexit(apr_terminate);
apr_pool_create(&pool, NULL);
if ((argc > 2) && (strcmp(argv[1], "-l") == 0)) {
argBase++;
argFile += argBase;
argIntv += argBase;
argOffset += argBase;
use_localtime = 1;
}
if (argc < (argBase + 3) || argc > (argBase + 4)) {
fprintf(stderr,
"Usage: %s [-l] <logfile> <rotation time in seconds> "
"[offset minutes from UTC] or <rotation size in megabytes>\n\n",
argv[0]);
#ifdef OS2
fprintf(stderr,
"Add this:\n\nTransferLog \"|%s.exe /some/where 86400\"\n\n",
argv[0]);
#else
fprintf(stderr,
"Add this:\n\nTransferLog \"|%s /some/where 86400\"\n\n",
argv[0]);
fprintf(stderr,
"or \n\nTransferLog \"|%s /some/where 5M\"\n\n", argv[0]);
#endif
fprintf(stderr,
"to httpd.conf. The generated name will be /some/where.nnnn "
"where nnnn is the\nsystem time at which the log nominally "
"starts (N.B. if using a rotation time,\nthe time will always "
"be a multiple of the rotation time, so you can synchronize\n"
"cron scripts with it). At the end of each rotation time or "
"when the file size\nis reached a new log is started.\n");
exit(1);
}
szLogRoot = argv[argFile];
ptr = strchr(argv[argIntv], 'M');
if (ptr) {
if (*(ptr+1) == '\0') {
sRotation = atoi(argv[argIntv]) * 1048576;
}
if (sRotation == 0) {
fprintf(stderr, "Invalid rotation size parameter\n");
exit(1);
}
}
else {
if (argc >= (argBase + 4)) {
utc_offset = atoi(argv[argOffset]) * 60;
}
tRotation = atoi(argv[argIntv]);
if (tRotation <= 0) {
fprintf(stderr, "Rotation time must be > 0\n");
exit(6);
}
}
use_strftime = (strchr(szLogRoot, '%') != NULL);
if (apr_file_open_stdin(&f_stdin, pool) != APR_SUCCESS) {
fprintf(stderr, "Unable to open stdin\n");
exit(1);
}
for (;;) {
nRead = sizeof(buf);
if (apr_file_read(f_stdin, buf, &nRead) != APR_SUCCESS) {
exit(3);
}
if (tRotation) {
/*
* Check for our UTC offset every time through the loop, since
* it might change if there's a switch between standard and
* daylight savings time.
*/
if (use_localtime) {
apr_time_exp_t lt;
apr_time_exp_lt(&lt, apr_time_now());
utc_offset = lt.tm_gmtoff;
}
now = (int)(apr_time_now() / APR_USEC_PER_SEC) + utc_offset;
if (nLogFD != NULL && now >= tLogEnd) {
nLogFDprev = nLogFD;
nLogFD = NULL;
}
}
else if (sRotation) {
apr_finfo_t finfo;
apr_off_t current_size = -1;
if ((nLogFD != NULL) &&
(apr_file_info_get(&finfo, APR_FINFO_SIZE, nLogFD) == APR_SUCCESS)) {
current_size = finfo.size;
}
if (current_size > sRotation) {
nLogFDprev = nLogFD;
nLogFD = NULL;
}
}
else {
fprintf(stderr, "No rotation time or size specified\n");
exit(2);
}
if (nLogFD == NULL) {
int tLogStart;
apr_status_t rv;
if (tRotation) {
tLogStart = (now / tRotation) * tRotation;
}
else {
tLogStart = (int)apr_time_sec(apr_time_now());
}
if (use_strftime) {
apr_time_t tNow = apr_time_from_sec(tLogStart);
apr_time_exp_t e;
apr_size_t rs;
apr_time_exp_gmt(&e, tNow);
apr_strftime(buf2, &rs, sizeof(buf2), szLogRoot, &e);
}
else {
sprintf(buf2, "%s.%010d", szLogRoot, tLogStart);
}
tLogEnd = tLogStart + tRotation;
rv = apr_file_open(&nLogFD, buf2, APR_WRITE | APR_CREATE | APR_APPEND,
APR_OS_DEFAULT, pool);
if (rv != APR_SUCCESS) {
char error[26];
apr_strerror(rv, error, sizeof error);
/* Uh-oh. Failed to open the new log file. Try to clear
* the previous log file, note the lost log entries,
* and keep on truckin'. */
if (nLogFDprev == NULL) {
fprintf(stderr, "Could not open log file '%s' (%s)\n", buf2, error);
exit(2);
}
else {
nLogFD = nLogFDprev;
/* Try to keep this error message constant length
* in case it occurs several times. */
apr_snprintf(errbuf, sizeof errbuf,
"Resetting log file due to error opening "
"new log file, %10d messages lost: %-25.25s\n",
nMessCount, error);
nWrite = strlen(errbuf);
apr_file_trunc(nLogFD, 0);
if (apr_file_write(nLogFD, errbuf, &nWrite) != APR_SUCCESS) {
fprintf(stderr, "Error writing to the file %s\n", buf2);
exit(2);
}
}
}
else if (nLogFDprev) {
apr_file_close(nLogFDprev);
}
nMessCount = 0;
}
nWrite = nRead;
apr_file_write(nLogFD, buf, &nWrite);
if (nWrite != nRead) {
nMessCount++;
sprintf(errbuf,
"Error writing to log file. "
"%10d messages lost.\n",
nMessCount);
nWrite = strlen(errbuf);
apr_file_trunc(nLogFD, 0);
if (apr_file_write(nLogFD, errbuf, &nWrite) != APR_SUCCESS) {
fprintf(stderr, "Error writing to the file %s\n", buf2);
exit(2);
}
}
else {
nMessCount++;
}
}
/* Of course we never, but prevent compiler warnings */
return 0;
}