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freebsd-nq/usr.sbin/newsyslog/newsyslog.c
Sheldon Hearn 669d663174 Close a very small window during which new (empty) instances of rotated log 
files are owned by the caller of newsyslog (usually root:wheel) even if
alternative ownerships were specified in newsyslog.conf.

Note that this is part of a wider problem which is fully addressed in
OpenBSD.  Anyone with the time and inclination to incorporate the full
fix for the wider problem will receive no complaints from me and should
feel free to walk all over this delta.

PR:		bin/36738
MFC after:	1 week
2002-04-10 10:38:44 +00:00

1118 lines
25 KiB
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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, char *errline);
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, char *errline);
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 && !force) {
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 != '$')
errx(1, "malformed interval/at:\n%s", errline);
if (*ep == '@') {
if ((working->trim_at = parse8601(ep + 1, errline))
== (time_t) - 1)
errx(1, "malformed at:\n%s", errline);
working->flags |= CE_TRIMAT;
} else if (*ep == '$') {
if ((working->trim_at = parseDWM(ep + 1, errline))
== (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];
char tfile[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 {
strlcpy(tfile, log, sizeof(tfile));
strlcat(tfile, ".XXXXXX", sizeof(tfile));
mkstemp(tfile);
fd = creat(tfile, 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(tfile)) /* Add status message */
err(1, "can't add status message to log");
}
if (noaction)
printf("chmod %o %s...\n", perm, log);
else {
(void) chmod(tfile, perm);
if (rename(tfile, log) < 0) {
err(1, "can't start new log");
(void) unlink(tfile);
}
}
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, (char *)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 *errline)
{
char *t;
time_t tsecs;
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;
}
if ((tsecs = mktime(&tm)) == -1)
errx(1, "nonexistent time:\n%s", errline);
return tsecs;
}
/* 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 *errline)
{
char *t;
time_t tsecs;
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;
}
if ((tsecs = mktime(&tm)) == -1)
errx(1, "nonexistent time:\n%s", errline);
return tsecs;
}
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