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freebsd-skq/usr.sbin/newsyslog/newsyslog.c

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/*
* This file contains changes from the Open Software Foundation.
*/
/*
* Copyright 1988, 1989 by the Massachusetts Institute of Technology
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose and without fee is hereby granted, provided
* that the above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the names of M.I.T. and the M.I.T. S.I.P.B. not be
* used in advertising or publicity pertaining to distribution of the
* software without specific, written prior permission. M.I.T. and the M.I.T.
* S.I.P.B. make no representations about the suitability of this software
* for any purpose. It is provided "as is" without express or implied
* warranty.
*
*/
/*
* newsyslog - roll over selected logs at the appropriate time, keeping the a
* specified number of backup files around.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#define OSF
#ifndef COMPRESS_POSTFIX
#define COMPRESS_POSTFIX ".gz"
#endif
#ifndef BZCOMPRESS_POSTFIX
#define BZCOMPRESS_POSTFIX ".bz2"
#endif
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/wait.h>
#include "pathnames.h"
#define kbytes(size) (((size) + 1023) >> 10)
#ifdef _IBMR2
/* Calculates (db * DEV_BSIZE) */
#define dbtob(db) ((unsigned)(db) << UBSHIFT)
#endif
#define CE_COMPACT 1 /* Compact the achived log files */
#define CE_BINARY 2 /* Logfile is in binary, don't add */
#define CE_BZCOMPACT 8 /* Compact the achived log files with bzip2 */
/* status messages */
#define CE_TRIMAT 4 /* trim at a specific time */
#define NONE -1
struct conf_entry {
char *log; /* Name of the log */
char *pid_file; /* PID file */
int uid; /* Owner of log */
int gid; /* Group of log */
int numlogs; /* Number of logs to keep */
int size; /* Size cutoff to trigger trimming the log */
int hours; /* Hours between log trimming */
time_t trim_at; /* Specific time to do trimming */
int permissions; /* File permissions on the log */
int flags; /* CE_COMPACT, CE_BZCOMPACT, CE_BINARY */
int sig; /* Signal to send */
struct conf_entry *next;/* Linked list pointer */
};
int archtodir = 0; /* Archive old logfiles to other directory */
int verbose = 0; /* Print out what's going on */
int needroot = 1; /* Root privs are necessary */
int noaction = 0; /* Don't do anything, just show it */
int force = 0; /* Force the trim no matter what */
char *archdirname; /* Directory path to old logfiles archive */
const char *conf = _PATH_CONF; /* Configuration file to use */
time_t timenow;
#define MIN_PID 5
#define MAX_PID 99999 /* was lower, see /usr/include/sys/proc.h */
char hostname[MAXHOSTNAMELEN]; /* hostname */
char *daytime; /* timenow in human readable form */
static struct conf_entry *parse_file(char **files);
static char *sob(char *p);
static char *son(char *p);
static char *missing_field(char *p, char *errline);
static void do_entry(struct conf_entry * ent);
static void PRS(int argc, char **argv);
static void usage(void);
static void dotrim(char *log, const char *pid_file, int numdays, int falgs,
int perm, int owner_uid, int group_gid, int sig);
static int log_trim(char *log);
static void compress_log(char *log);
static void bzcompress_log(char *log);
static int sizefile(char *file);
static int age_old_log(char *file);
static pid_t get_pid(const char *pid_file);
static time_t parse8601(char *s);
static void movefile(char *from, char *to, int perm, int owner_uid,
int group_gid);
static void createdir(char *dirpart);
static time_t parseDWM(char *s);
int
main(int argc, char **argv)
{
struct conf_entry *p, *q;
PRS(argc, argv);
if (needroot && getuid() && geteuid())
errx(1, "must have root privs");
p = q = parse_file(argv + optind);
while (p) {
do_entry(p);
p = p->next;
free((char *) q);
q = p;
}
return (0);
}
static void
do_entry(struct conf_entry * ent)
{
int size, modtime;
const char *pid_file;
if (verbose) {
if (ent->flags & CE_COMPACT)
printf("%s <%dZ>: ", ent->log, ent->numlogs);
else if (ent->flags & CE_BZCOMPACT)
printf("%s <%dJ>: ", ent->log, ent->numlogs);
else
printf("%s <%d>: ", ent->log, ent->numlogs);
}
size = sizefile(ent->log);
modtime = age_old_log(ent->log);
if (size < 0) {
if (verbose)
printf("does not exist.\n");
} else {
if (ent->flags & CE_TRIMAT) {
if (timenow < ent->trim_at
|| difftime(timenow, ent->trim_at) >= 60 * 60) {
if (verbose)
printf("--> will trim at %s",
ctime(&ent->trim_at));
return;
} else if (verbose && ent->hours <= 0) {
printf("--> time is up\n");
}
}
if (verbose && (ent->size > 0))
printf("size (Kb): %d [%d] ", size, ent->size);
if (verbose && (ent->hours > 0))
printf(" age (hr): %d [%d] ", modtime, ent->hours);
if (force || ((ent->size > 0) && (size >= ent->size)) ||
(ent->hours <= 0 && (ent->flags & CE_TRIMAT)) ||
((ent->hours > 0) && ((modtime >= ent->hours)
|| (modtime < 0)))) {
if (verbose)
printf("--> trimming log....\n");
if (noaction && !verbose) {
if (ent->flags & CE_COMPACT)
printf("%s <%dZ>: trimming\n",
ent->log, ent->numlogs);
else if (ent->flags & CE_BZCOMPACT)
printf("%s <%dJ>: trimming\n",
ent->log, ent->numlogs);
else
printf("%s <%d>: trimming\n",
ent->log, ent->numlogs);
}
if (ent->pid_file) {
pid_file = ent->pid_file;
} else {
/* Only try to notify syslog if we are root */
if (needroot)
pid_file = _PATH_SYSLOGPID;
else
pid_file = NULL;
}
dotrim(ent->log, pid_file, ent->numlogs,
ent->flags, ent->permissions, ent->uid, ent->gid,
ent->sig);
} else {
if (verbose)
printf("--> skipping\n");
}
}
}
static void
PRS(int argc, char **argv)
{
int c;
char *p;
timenow = time((time_t *) 0);
daytime = ctime(&timenow) + 4;
daytime[15] = '\0';
/* Let's get our hostname */
(void) gethostname(hostname, sizeof(hostname));
/* Truncate domain */
if ((p = strchr(hostname, '.'))) {
*p = '\0';
}
while ((c = getopt(argc, argv, "nrvFf:a:t:")) != -1)
switch (c) {
case 'n':
noaction++;
break;
case 'a':
archtodir++;
archdirname = optarg;
break;
case 'r':
needroot = 0;
break;
case 'v':
verbose++;
break;
case 'f':
conf = optarg;
break;
case 'F':
force++;
break;
default:
usage();
}
}
static void
usage(void)
{
fprintf(stderr,
"usage: newsyslog [-Fnrv] [-f config-file] [-a directory]\n");
exit(1);
}
/*
* Parse a configuration file and return a linked list of all the logs to
* process
*/
static struct conf_entry *
parse_file(char **files)
{
FILE *f;
char line[BUFSIZ], *parse, *q;
char *errline, *group;
char **p;
struct conf_entry *first, *working;
struct passwd *pass;
struct group *grp;
int eol;
first = working = NULL;
if (strcmp(conf, "-"))
f = fopen(conf, "r");
else
f = stdin;
if (!f)
err(1, "%s", conf);
while (fgets(line, BUFSIZ, f)) {
if ((line[0] == '\n') || (line[0] == '#'))
continue;
errline = strdup(line);
q = parse = missing_field(sob(line), errline);
parse = son(line);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if (*files) {
for (p = files; *p; ++p)
if (strcmp(*p, q) == 0)
break;
if (!*p)
continue;
}
if (!first) {
if ((working = malloc(sizeof(struct conf_entry))) ==
NULL)
err(1, "malloc");
first = working;
} else {
if ((working->next = malloc(sizeof(struct conf_entry)))
== NULL)
err(1, "malloc");
working = working->next;
}
if ((working->log = strdup(q)) == NULL)
err(1, "strdup");
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if ((group = strchr(q, ':')) != NULL ||
(group = strrchr(q, '.')) != NULL) {
*group++ = '\0';
if (*q) {
if (!(isnumber(*q))) {
if ((pass = getpwnam(q)) == NULL)
errx(1,
"error in config file; unknown user:\n%s",
errline);
working->uid = pass->pw_uid;
} else
working->uid = atoi(q);
} else
working->uid = NONE;
q = group;
if (*q) {
if (!(isnumber(*q))) {
if ((grp = getgrnam(q)) == NULL)
errx(1,
"error in config file; unknown group:\n%s",
errline);
working->gid = grp->gr_gid;
} else
working->gid = atoi(q);
} else
working->gid = NONE;
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
} else
working->uid = working->gid = NONE;
if (!sscanf(q, "%o", &working->permissions))
errx(1, "error in config file; bad permissions:\n%s",
errline);
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if (!sscanf(q, "%d", &working->numlogs))
errx(1, "error in config file; bad number:\n%s",
errline);
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
if (!*parse)
errx(1, "malformed line (missing fields):\n%s",
errline);
*parse = '\0';
if (isdigit(*q))
working->size = atoi(q);
else
working->size = -1;
working->flags = 0;
q = parse = missing_field(sob(++parse), errline);
parse = son(parse);
eol = !*parse;
*parse = '\0';
{
char *ep;
u_long ul;
ul = strtoul(q, &ep, 10);
if (ep == q)
working->hours = 0;
else if (*ep == '*')
working->hours = -1;
else if (ul > INT_MAX)
errx(1, "interval is too large:\n%s", errline);
else
working->hours = ul;
if (*ep != '\0' && *ep != '@' && *ep != '*' &&
*ep != '$')
errx(1, "malformed interval/at:\n%s", errline);
if (*ep == '@') {
if ((working->trim_at = parse8601(ep + 1))
== (time_t) - 1)
errx(1, "malformed at:\n%s", errline);
working->flags |= CE_TRIMAT;
} else if (*ep == '$') {
if ((working->trim_at = parseDWM(ep + 1))
== (time_t) - 1)
errx(1, "malformed at:\n%s", errline);
working->flags |= CE_TRIMAT;
}
}
if (eol)
q = NULL;
else {
q = parse = sob(++parse); /* Optional field */
parse = son(parse);
if (!*parse)
eol = 1;
*parse = '\0';
}
while (q && *q && !isspace(*q)) {
if ((*q == 'Z') || (*q == 'z'))
working->flags |= CE_COMPACT;
else if ((*q == 'J') || (*q == 'j'))
working->flags |= CE_BZCOMPACT;
else if ((*q == 'B') || (*q == 'b'))
working->flags |= CE_BINARY;
else if (*q != '-')
errx(1, "illegal flag in config file -- %c",
*q);
q++;
}
if (eol)
q = NULL;
else {
q = parse = sob(++parse); /* Optional field */
parse = son(parse);
if (!*parse)
eol = 1;
*parse = '\0';
}
working->pid_file = NULL;
if (q && *q) {
if (*q == '/')
working->pid_file = strdup(q);
else if (isdigit(*q))
goto got_sig;
else
errx(1,
"illegal pid file or signal number in config file:\n%s",
errline);
}
if (eol)
q = NULL;
else {
q = parse = sob(++parse); /* Optional field */
*(parse = son(parse)) = '\0';
}
working->sig = SIGHUP;
if (q && *q) {
if (isdigit(*q)) {
got_sig:
working->sig = atoi(q);
} else {
err_sig:
errx(1,
"illegal signal number in config file:\n%s",
errline);
}
if (working->sig < 1 || working->sig >= NSIG)
goto err_sig;
}
free(errline);
}
if (working)
working->next = (struct conf_entry *) NULL;
(void) fclose(f);
return (first);
}
static char *
missing_field(char *p, char *errline)
{
if (!p || !*p)
errx(1, "missing field in config file:\n%s", errline);
return (p);
}
static void
dotrim(char *log, const char *pid_file, int numdays, int flags, int perm,
int owner_uid, int group_gid, int sig)
{
char dirpart[MAXPATHLEN], namepart[MAXPATHLEN];
char file1[MAXPATHLEN], file2[MAXPATHLEN];
char zfile1[MAXPATHLEN], zfile2[MAXPATHLEN];
char jfile1[MAXPATHLEN];
int notified, need_notification, fd, _numdays;
struct stat st;
pid_t pid;
#ifdef _IBMR2
/*
* AIX 3.1 has a broken fchown- if the owner_uid is -1, it will
* actually change it to be owned by uid -1, instead of leaving it
* as is, as it is supposed to.
*/
if (owner_uid == -1)
owner_uid = geteuid();
#endif
if (archtodir) {
char *p;
/* build complete name of archive directory into dirpart */
if (*archdirname == '/') { /* absolute */
strlcpy(dirpart, archdirname, sizeof(dirpart));
} else { /* relative */
/* get directory part of logfile */
strlcpy(dirpart, log, sizeof(dirpart));
if ((p = rindex(dirpart, '/')) == NULL)
dirpart[0] = '\0';
else
*(p + 1) = '\0';
strlcat(dirpart, archdirname, sizeof(dirpart));
}
/* check if archive directory exists, if not, create it */
if (lstat(dirpart, &st))
createdir(dirpart);
/* get filename part of logfile */
if ((p = rindex(log, '/')) == NULL)
strlcpy(namepart, log, sizeof(namepart));
else
strlcpy(namepart, p + 1, sizeof(namepart));
/* name of oldest log */
(void) snprintf(file1, sizeof(file1), "%s/%s.%d", dirpart,
namepart, numdays);
(void) snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
COMPRESS_POSTFIX);
snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
BZCOMPRESS_POSTFIX);
} else {
/* name of oldest log */
(void) snprintf(file1, sizeof(file1), "%s.%d", log, numdays);
(void) snprintf(zfile1, sizeof(zfile1), "%s%s", file1,
COMPRESS_POSTFIX);
snprintf(jfile1, sizeof(jfile1), "%s%s", file1,
BZCOMPRESS_POSTFIX);
}
if (noaction) {
printf("rm -f %s\n", file1);
printf("rm -f %s\n", zfile1);
printf("rm -f %s\n", jfile1);
} else {
(void) unlink(file1);
(void) unlink(zfile1);
(void) unlink(jfile1);
}
/* Move down log files */
_numdays = numdays; /* preserve */
while (numdays--) {
(void) strlcpy(file2, file1, sizeof(file2));
if (archtodir)
(void) snprintf(file1, sizeof(file1), "%s/%s.%d",
dirpart, namepart, numdays);
else
(void) snprintf(file1, sizeof(file1), "%s.%d", log,
numdays);
(void) strlcpy(zfile1, file1, sizeof(zfile1));
(void) strlcpy(zfile2, file2, sizeof(zfile2));
if (lstat(file1, &st)) {
(void) strlcat(zfile1, COMPRESS_POSTFIX,
sizeof(zfile1));
(void) strlcat(zfile2, COMPRESS_POSTFIX,
sizeof(zfile2));
if (lstat(zfile1, &st)) {
strlcpy(zfile1, file1, sizeof(zfile1));
strlcpy(zfile2, file2, sizeof(zfile2));
strlcat(zfile1, BZCOMPRESS_POSTFIX,
sizeof(zfile1));
strlcat(zfile2, BZCOMPRESS_POSTFIX,
sizeof(zfile2));
if (lstat(zfile1, &st))
continue;
}
}
if (noaction) {
printf("mv %s %s\n", zfile1, zfile2);
printf("chmod %o %s\n", perm, zfile2);
printf("chown %d:%d %s\n",
owner_uid, group_gid, zfile2);
} else {
(void) rename(zfile1, zfile2);
(void) chmod(zfile2, perm);
(void) chown(zfile2, owner_uid, group_gid);
}
}
if (!noaction && !(flags & CE_BINARY))
(void) log_trim(log); /* Report the trimming to the old log */
if (!_numdays) {
if (noaction)
printf("rm %s\n", log);
else
(void) unlink(log);
} else {
if (noaction)
printf("mv %s to %s\n", log, file1);
else {
if (archtodir)
movefile(log, file1, perm, owner_uid,
group_gid);
else
(void) rename(log, file1);
}
}
if (noaction)
printf("Start new log...");
else {
fd = creat(log, perm);
if (fd < 0)
err(1, "can't start new log");
if (fchown(fd, owner_uid, group_gid))
err(1, "can't chmod new log file");
(void) close(fd);
if (!(flags & CE_BINARY))
if (log_trim(log)) /* Add status message */
err(1, "can't add status message to log");
}
if (noaction)
printf("chmod %o %s...\n", perm, log);
else
(void) chmod(log, perm);
pid = 0;
need_notification = notified = 0;
if (pid_file != NULL) {
need_notification = 1;
pid = get_pid(pid_file);
}
if (pid) {
if (noaction) {
notified = 1;
printf("kill -%d %d\n", sig, (int) pid);
} else if (kill(pid, sig))
warn("can't notify daemon, pid %d", (int) pid);
else {
notified = 1;
if (verbose)
printf("daemon pid %d notified\n", (int) pid);
}
}
if ((flags & CE_COMPACT) || (flags & CE_BZCOMPACT)) {
if (need_notification && !notified)
warnx(
"log %s not compressed because daemon not notified",
log);
else if (noaction)
printf("Compress %s.0\n", log);
else {
if (notified) {
if (verbose)
printf("small pause to allow daemon to close log\n");
sleep(10);
}
if (archtodir) {
(void) snprintf(file1, sizeof(file1), "%s/%s",
dirpart, namepart);
if (flags & CE_COMPACT)
compress_log(file1);
else if (flags & CE_BZCOMPACT)
bzcompress_log(file1);
} else {
if (flags & CE_COMPACT)
compress_log(log);
else if (flags & CE_BZCOMPACT)
bzcompress_log(log);
}
}
}
}
/* Log the fact that the logs were turned over */
static int
log_trim(char *log)
{
FILE *f;
if ((f = fopen(log, "a")) == NULL)
return (-1);
fprintf(f, "%s %s newsyslog[%d]: logfile turned over\n",
daytime, hostname, (int) getpid());
if (fclose(f) == EOF)
err(1, "log_trim: fclose:");
return (0);
}
/* Fork of gzip to compress the old log file */
static void
compress_log(char *log)
{
pid_t pid;
char tmp[MAXPATHLEN];
(void) snprintf(tmp, sizeof(tmp), "%s.0", log);
pid = fork();
if (pid < 0)
err(1, "gzip fork");
else if (!pid) {
(void) execl(_PATH_GZIP, _PATH_GZIP, "-f", tmp, (char *)0);
err(1, _PATH_GZIP);
}
}
/* Fork of bzip2 to compress the old log file */
static void
bzcompress_log(char *log)
{
pid_t pid;
char tmp[MAXPATHLEN];
snprintf(tmp, sizeof(tmp), "%s.0", log);
pid = fork();
if (pid < 0)
err(1, "bzip2 fork");
else if (!pid) {
execl(_PATH_BZIP2, _PATH_BZIP2, "-f", tmp, 0);
err(1, _PATH_BZIP2);
}
}
/* Return size in kilobytes of a file */
static int
sizefile(char *file)
{
struct stat sb;
if (stat(file, &sb) < 0)
return (-1);
return (kbytes(dbtob(sb.st_blocks)));
}
/* Return the age of old log file (file.0) */
static int
age_old_log(char *file)
{
struct stat sb;
char tmp[MAXPATHLEN + sizeof(".0") + sizeof(COMPRESS_POSTFIX) + 1];
if (archtodir) {
char *p;
/* build name of archive directory into tmp */
if (*archdirname == '/') { /* absolute */
strlcpy(tmp, archdirname, sizeof(tmp));
} else { /* relative */
/* get directory part of logfile */
strlcpy(tmp, file, sizeof(tmp));
if ((p = rindex(tmp, '/')) == NULL)
tmp[0] = '\0';
else
*(p + 1) = '\0';
strlcat(tmp, archdirname, sizeof(tmp));
}
strlcat(tmp, "/", sizeof(tmp));
/* get filename part of logfile */
if ((p = rindex(file, '/')) == NULL)
strlcat(tmp, file, sizeof(tmp));
else
strlcat(tmp, p + 1, sizeof(tmp));
} else {
(void) strlcpy(tmp, file, sizeof(tmp));
}
if (stat(strcat(tmp, ".0"), &sb) < 0)
if (stat(strcat(tmp, COMPRESS_POSTFIX), &sb) < 0)
return (-1);
return ((int) (timenow - sb.st_mtime + 1800) / 3600);
}
static pid_t
get_pid(const char *pid_file)
{
FILE *f;
char line[BUFSIZ];
pid_t pid = 0;
if ((f = fopen(pid_file, "r")) == NULL)
warn("can't open %s pid file to restart a daemon",
pid_file);
else {
if (fgets(line, BUFSIZ, f)) {
pid = atol(line);
if (pid < MIN_PID || pid > MAX_PID) {
warnx("preposterous process number: %d",
(int)pid);
pid = 0;
}
} else
warn("can't read %s pid file to restart a daemon",
pid_file);
(void) fclose(f);
}
return pid;
}
/* Skip Over Blanks */
char *
sob(char *p)
{
while (p && *p && isspace(*p))
p++;
return (p);
}
/* Skip Over Non-Blanks */
char *
son(char *p)
{
while (p && *p && !isspace(*p))
p++;
return (p);
}
/*
* Parse a limited subset of ISO 8601. The specific format is as follows:
*
* [CC[YY[MM[DD]]]][THH[MM[SS]]] (where `T' is the literal letter)
*
* We don't accept a timezone specification; missing fields (including timezone)
* are defaulted to the current date but time zero.
*/
static time_t
parse8601(char *s)
{
char *t;
struct tm tm, *tmp;
u_long ul;
tmp = localtime(&timenow);
tm = *tmp;
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
ul = strtoul(s, &t, 10);
if (*t != '\0' && *t != 'T')
return -1;
/*
* Now t points either to the end of the string (if no time was
* provided) or to the letter `T' which separates date and time in
* ISO 8601. The pointer arithmetic is the same for either case.
*/
switch (t - s) {
case 8:
tm.tm_year = ((ul / 1000000) - 19) * 100;
ul = ul % 1000000;
case 6:
tm.tm_year -= tm.tm_year % 100;
tm.tm_year += ul / 10000;
ul = ul % 10000;
case 4:
tm.tm_mon = (ul / 100) - 1;
ul = ul % 100;
case 2:
tm.tm_mday = ul;
case 0:
break;
default:
return -1;
}
/* sanity check */
if (tm.tm_year < 70 || tm.tm_mon < 0 || tm.tm_mon > 12
|| tm.tm_mday < 1 || tm.tm_mday > 31)
return -1;
if (*t != '\0') {
s = ++t;
ul = strtoul(s, &t, 10);
if (*t != '\0' && !isspace(*t))
return -1;
switch (t - s) {
case 6:
tm.tm_sec = ul % 100;
ul /= 100;
case 4:
tm.tm_min = ul % 100;
ul /= 100;
case 2:
tm.tm_hour = ul;
case 0:
break;
default:
return -1;
}
/* sanity check */
if (tm.tm_sec < 0 || tm.tm_sec > 60 || tm.tm_min < 0
|| tm.tm_min > 59 || tm.tm_hour < 0 || tm.tm_hour > 23)
return -1;
}
return mktime(&tm);
}
/* physically move file */
static void
movefile(char *from, char *to, int perm, int owner_uid, int group_gid)
{
FILE *src, *dst;
int c;
if ((src = fopen(from, "r")) == NULL)
err(1, "can't fopen %s for reading", from);
if ((dst = fopen(to, "w")) == NULL)
err(1, "can't fopen %s for writing", to);
if (fchown(fileno(dst), owner_uid, group_gid))
err(1, "can't fchown %s", to);
if (fchmod(fileno(dst), perm))
err(1, "can't fchmod %s", to);
while ((c = getc(src)) != EOF) {
if ((putc(c, dst)) == EOF)
err(1, "error writing to %s", to);
}
if (ferror(src))
err(1, "error reading from %s", from);
if ((fclose(src)) != 0)
err(1, "can't fclose %s", to);
if ((fclose(dst)) != 0)
err(1, "can't fclose %s", from);
if ((unlink(from)) != 0)
err(1, "can't unlink %s", from);
}
/* create one or more directory components of a path */
static void
createdir(char *dirpart)
{
char *s, *d;
char mkdirpath[MAXPATHLEN];
struct stat st;
s = dirpart;
d = mkdirpath;
for (;;) {
*d++ = *s++;
if (*s == '/' || *s == '\0') {
*d = '\0';
if (lstat(mkdirpath, &st))
mkdir(mkdirpath, 0755);
}
if (*s == '\0')
break;
}
}
/*-
* Parse a cyclic time specification, the format is as follows:
*
* [Dhh] or [Wd[Dhh]] or [Mdd[Dhh]]
*
* to rotate a logfile cyclic at
*
* - every day (D) within a specific hour (hh) (hh = 0...23)
* - once a week (W) at a specific day (d) OR (d = 0..6, 0 = Sunday)
* - once a month (M) at a specific day (d) (d = 1..31,l|L)
*
* We don't accept a timezone specification; missing fields
* are defaulted to the current date but time zero.
*/
static time_t
parseDWM(char *s)
{
char *t;
struct tm tm, *tmp;
long l;
int nd;
static int mtab[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
int WMseen = 0;
int Dseen = 0;
tmp = localtime(&timenow);
tm = *tmp;
/* set no. of days per month */
nd = mtab[tm.tm_mon];
if (tm.tm_mon == 1) {
if (((tm.tm_year + 1900) % 4 == 0) &&
((tm.tm_year + 1900) % 100 != 0) &&
((tm.tm_year + 1900) % 400 == 0)) {
nd++; /* leap year, 29 days in february */
}
}
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
for (;;) {
switch (*s) {
case 'D':
if (Dseen)
return -1;
Dseen++;
s++;
l = strtol(s, &t, 10);
if (l < 0 || l > 23)
return -1;
tm.tm_hour = l;
break;
case 'W':
if (WMseen)
return -1;
WMseen++;
s++;
l = strtol(s, &t, 10);
if (l < 0 || l > 6)
return -1;
if (l != tm.tm_wday) {
int save;
if (l < tm.tm_wday) {
save = 6 - tm.tm_wday;
save += (l + 1);
} else {
save = l - tm.tm_wday;
}
tm.tm_mday += save;
if (tm.tm_mday > nd) {
tm.tm_mon++;
tm.tm_mday = tm.tm_mday - nd;
}
}
break;
case 'M':
if (WMseen)
return -1;
WMseen++;
s++;
if (tolower(*s) == 'l') {
tm.tm_mday = nd;
s++;
t = s;
} else {
l = strtol(s, &t, 10);
if (l < 1 || l > 31)
return -1;
if (l > nd)
return -1;
tm.tm_mday = l;
}
break;
default:
return (-1);
break;
}
if (*t == '\0' || isspace(*t))
break;
else
s = t;
}
return mktime(&tm);
}
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