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NetBSD/usr.bin/newsyslog/newsyslog.c

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/* $NetBSD: newsyslog.c,v 1.48 2004/10/30 21:03:36 dsl Exp $ */
/*
* Copyright (c) 1999, 2000 Andrew Doran <ad@NetBSD.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
* 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(8) - a program to roll over log files provided that specified
* critera are met, optionally preserving a number of historical log files.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: newsyslog.c,v 1.48 2004/10/30 21:03:36 dsl Exp $");
#endif /* not lint */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <sys/wait.h>
#include <ctype.h>
#include <fcntl.h>
#include <grp.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <errno.h>
#include <err.h>
#include <paths.h>
#include "pathnames.h"
#define PRHDRINFO(x) ((void)(verbose ? printf x : 0))
#define PRINFO(x) ((void)(verbose ? printf(" ") + printf x : 0))
#define CE_COMPRESS 0x01 /* Compress the archived log files */
#define CE_BINARY 0x02 /* Logfile is a binary file/non-syslog */
#define CE_NOSIGNAL 0x04 /* Don't send a signal when trimmed */
#define CE_CREATE 0x08 /* Create log file if none exists */
#define CE_PLAIN0 0x10 /* Do not compress zero'th history file */
struct conf_entry {
uid_t uid; /* Owner of log */
gid_t gid; /* Group of log */
mode_t mode; /* File permissions */
int numhist; /* Number of historical logs to keep */
size_t maxsize; /* Maximum log size */
int maxage; /* Hours between log trimming */
time_t trimat; /* Specific trim time */
int flags; /* Flags (CE_*) */
int signum; /* Signal to send */
char pidfile[MAXPATHLEN]; /* File containing PID to signal */
char logfile[MAXPATHLEN]; /* Path to log file */
};
int verbose; /* Be verbose */
int noaction; /* Take no action */
int nosignal; /* Do not send signals */
char hostname[MAXHOSTNAMELEN + 1]; /* Hostname, stripped of domain */
uid_t myeuid; /* EUID we are running with */
int getsig(const char *);
int isnumber(const char *);
int main(int, char **);
int parse_cfgline(struct conf_entry *, FILE *, size_t *);
time_t parse_iso8601(char *);
time_t parse_dwm(char *);
int parse_userspec(const char *, struct passwd **, struct group **);
pid_t readpidfile(const char *);
void usage(void);
void log_compress(struct conf_entry *, const char *);
void log_create(struct conf_entry *);
void log_examine(struct conf_entry *, int);
void log_trim(struct conf_entry *);
void log_trimmed(struct conf_entry *);
/*
* Program entry point.
*/
int
main(int argc, char **argv)
{
struct conf_entry log;
FILE *fd;
char *p, *cfile;
int c, needroot, i, force;
size_t lineno;
force = 0;
needroot = 1;
cfile = _PATH_NEWSYSLOGCONF;
gethostname(hostname, sizeof(hostname));
hostname[sizeof(hostname) - 1] = '\0';
/* Truncate domain. */
if ((p = strchr(hostname, '.')) != NULL)
*p = '\0';
/* Parse command line options. */
while ((c = getopt(argc, argv, "f:nrsvF")) != -1) {
switch (c) {
case 'f':
cfile = optarg;
break;
case 'n':
noaction = 1;
verbose = 1;
break;
case 'r':
needroot = 0;
break;
case 's':
nosignal = 1;
break;
case 'v':
verbose = 1;
break;
case 'F':
force = 1;
break;
default:
usage();
/* NOTREACHED */
}
}
myeuid = geteuid();
if (needroot && myeuid != 0)
errx(EXIT_FAILURE, "must be run as root");
argc -= optind;
argv += optind;
if (strcmp(cfile, "-") == 0)
fd = stdin;
else if ((fd = fopen(cfile, "rt")) == NULL)
err(EXIT_FAILURE, "%s", cfile);
for (lineno = 0; !parse_cfgline(&log, fd, &lineno);) {
/*
* If specific log files were specified, touch only
* those.
*/
if (argc != 0) {
for (i = 0; i < argc; i++)
if (strcmp(log.logfile, argv[i]) == 0)
break;
if (i == argc)
continue;
}
log_examine(&log, force);
}
if (fd != stdin)
fclose(fd);
exit(EXIT_SUCCESS);
/* NOTREACHED */
}
/*
* Parse a single line from the configuration file.
*/
int
parse_cfgline(struct conf_entry *log, FILE *fd, size_t *_lineno)
{
char *line, *q, **ap, *argv[10];
struct passwd *pw;
struct group *gr;
int nf, lineno, i, rv;
rv = -1;
line = NULL;
/* Place the white-space separated fields into an array. */
do {
if (line != NULL)
free(line);
if ((line = fparseln(fd, NULL, _lineno, NULL, 0)) == NULL)
return (rv);
lineno = (int)*_lineno;
for (ap = argv, nf = 0; (*ap = strsep(&line, " \t")) != NULL;)
if (**ap != '\0') {
if (++nf == sizeof(argv) / sizeof(argv[0])) {
warnx("config line %d: "
"too many fields", lineno);
goto bad;
}
ap++;
}
} while (nf == 0);
if (nf < 6)
errx(EXIT_FAILURE, "config line %d: too few fields", lineno);
memset(log, 0, sizeof(*log));
/* logfile_name */
ap = argv;
strlcpy(log->logfile, *ap++, sizeof(log->logfile));
if (log->logfile[0] != '/')
errx(EXIT_FAILURE,
"config line %d: logfile must have a full path", lineno);
/* owner:group */
if (strchr(*ap, ':') != NULL || strchr(*ap, '.') != NULL) {
if (parse_userspec(*ap++, &pw, &gr)) {
warnx("config line %d: unknown user/group", lineno);
goto bad;
}
/*
* We may only change the file's owner as non-root.
*/
if (myeuid != 0) {
if (pw->pw_uid != myeuid)
errx(EXIT_FAILURE, "config line %d: user:group "
"as non-root must match current user",
lineno);
log->uid = (uid_t)-1;
} else
log->uid = pw->pw_uid;
log->gid = gr->gr_gid;
if (nf < 7)
errx(EXIT_FAILURE, "config line %d: too few fields",
lineno);
} else if (myeuid != 0) {
log->uid = (uid_t)-1;
log->gid = getegid();
}
/* mode */
if (sscanf(*ap++, "%o", &i) != 1) {
warnx("config line %d: bad permissions", lineno);
goto bad;
}
log->mode = (mode_t)i;
/* count */
if (sscanf(*ap++, "%d", &log->numhist) != 1) {
warnx("config line %d: bad log count", lineno);
goto bad;
}
/* size */
if (**ap == '*')
log->maxsize = (size_t)-1;
else {
log->maxsize = (int)strtol(*ap, &q, 0);
if (*q != '\0') {
warnx("config line %d: bad log size", lineno);
goto bad;
}
}
ap++;
/* when */
log->maxage = -1;
log->trimat = (time_t)-1;
q = *ap++;
if (strcmp(q, "*") != 0) {
if (isdigit((unsigned char)*q))
log->maxage = (int)strtol(q, &q, 10);
/*
* One class of periodic interval specification can follow a
* maximum age specification. Handle it.
*/
if (*q == '@') {
log->trimat = parse_iso8601(q + 1);
if (log->trimat == (time_t)-1) {
warnx("config line %d: bad trim time", lineno);
goto bad;
}
} else if (*q == '$') {
if ((log->trimat = parse_dwm(q + 1)) == (time_t)-1) {
warnx("config line %d: bad trim time", lineno);
goto bad;
}
} else if (log->maxage == -1) {
warnx("config line %d: bad log age", lineno);
goto bad;
}
}
/* flags */
log->flags = (nosignal ? CE_NOSIGNAL : 0);
for (q = *ap++; q != NULL && *q != '\0'; q++) {
switch (tolower((unsigned char)*q)) {
case 'b':
log->flags |= CE_BINARY;
break;
case 'c':
log->flags |= CE_CREATE;
break;
case 'n':
log->flags |= CE_NOSIGNAL;
break;
case 'p':
log->flags |= CE_PLAIN0;
break;
case 'z':
log->flags |= CE_COMPRESS;
break;
case '-':
break;
default:
warnx("config line %d: bad flags", lineno);
goto bad;
}
}
/* path_to_pidfile */
if (*ap != NULL && **ap == '/')
strlcpy(log->pidfile, *ap++, sizeof(log->pidfile));
else
log->pidfile[0] = '\0';
/* sigtype */
if (*ap != NULL) {
if ((log->signum = getsig(*ap++)) < 0) {
warnx("config line %d: bad signal type", lineno);
goto bad;
}
} else
log->signum = SIGHUP;
rv = 0;
bad:
free(line);
return (rv);
}
/*
* Examine a log file. If the trim conditions are met, call log_trim() to
* trim the log file.
*/
void
log_examine(struct conf_entry *log, int force)
{
struct stat sb;
size_t size;
int age, trim;
char tmp[MAXPATHLEN];
const char *reason;
time_t now;
now = time(NULL);
PRHDRINFO(("\n%s <%d%s>: ", log->logfile, log->numhist,
(log->flags & CE_COMPRESS) != 0 ? "Z" : ""));
/*
* stat() the logfile. If it doesn't exist and the `c' flag has
* been specified, create it. If it doesn't exist and the `c' flag
* hasn't been specified, give up.
*/
if (stat(log->logfile, &sb) < 0) {
if (errno == ENOENT && (log->flags & CE_CREATE) != 0) {
PRHDRINFO(("creating; "));
if (!noaction)
log_create(log);
else {
PRHDRINFO(("can't proceed with `-n'\n"));
return;
}
if (stat(log->logfile, &sb))
err(EXIT_FAILURE, "%s", log->logfile);
} else if (errno == ENOENT) {
PRHDRINFO(("does not exist --> skip log\n"));
return;
} else if (errno != 0)
err(EXIT_FAILURE, "%s", log->logfile);
}
if (!S_ISREG(sb.st_mode)) {
PRHDRINFO(("not a regular file --> skip log\n"));
return;
}
/* Size of the log file in kB. */
size = ((size_t)sb.st_blocks * S_BLKSIZE) >> 10;
/*
* Get the age (expressed in hours) of the current log file with
* respect to the newest historical log file.
*/
strlcpy(tmp, log->logfile, sizeof(tmp));
strlcat(tmp, ".0", sizeof(tmp));
if (stat(tmp, &sb) < 0) {
strlcat(tmp, ".gz", sizeof(tmp));
if (stat(tmp, &sb) < 0)
age = -1;
else
age = (int)(now - sb.st_mtime + 1800) / 3600;
} else
age = (int)(now - sb.st_mtime + 1800) / 3600;
/*
* Examine the set of given trim conditions and if any one is met,
* trim the log.
*
* Note: if `maxage' or `trimat' is used as a trim condition, we
* need at least one historical log file to determine the `age' of
* the active log file. WRT `trimat', we will trim up to one hour
* after the specific trim time has passed - we need to know if
* we've trimmed to meet that condition with a previous invocation
* of newsyslog(8).
*/
if (log->maxage >= 0 && (age >= log->maxage || age < 0)) {
trim = 1;
reason = "log age > interval";
} else if (size >= log->maxsize) {
trim = 1;
reason = "log size > size";
} else if (log->trimat != (time_t)-1 && now >= log->trimat &&
(age == -1 || age > 1) &&
difftime(now, log->trimat) < 60 * 60) {
trim = 1;
reason = "specific trim time";
} else {
trim = force;
reason = "trim forced";
}
if (trim) {
PRHDRINFO(("--> trim log (%s)\n", reason));
log_trim(log);
} else
PRHDRINFO(("--> skip log (trim conditions not met)\n"));
}
/*
* Trim the specified log file.
*/
void
log_trim(struct conf_entry *log)
{
char file1[MAXPATHLEN], file2[MAXPATHLEN];
int i;
struct stat st;
pid_t pid;
if (log->numhist != 0) {
/* Remove oldest historical log. */
snprintf(file1, sizeof(file1), "%s.%d", log->logfile,
log->numhist - 1);
PRINFO(("rm -f %s\n", file1));
if (!noaction)
unlink(file1);
strlcat(file1, ".gz", sizeof(file1));
PRINFO(("rm -f %s\n", file1));
if (!noaction)
unlink(file1);
}
/* Move down log files. */
for (i = log->numhist - 1; i > 0; i--) {
snprintf(file1, sizeof(file1), "%s.%d", log->logfile, i - 1);
snprintf(file2, sizeof(file2), "%s.%d", log->logfile, i);
if (lstat(file1, &st) != 0) {
strlcat(file1, ".gz", sizeof(file1));
strlcat(file2, ".gz", sizeof(file2));
if (lstat(file1, &st) != 0)
continue;
}
PRINFO(("mv %s %s\n", file1, file2));
if (!noaction)
if (rename(file1, file2))
err(EXIT_FAILURE, "%s", file1);
PRINFO(("chmod %o %s\n", log->mode, file2));
if (!noaction)
if (chmod(file2, log->mode))
err(EXIT_FAILURE, "%s", file2);
PRINFO(("chown %d:%d %s\n", log->uid, log->gid,
file2));
if (!noaction)
if (chown(file2, log->uid, log->gid))
err(EXIT_FAILURE, "%s", file2);
}
/*
* If a historical log file isn't compressed, and 'z' has been
* specified, compress it. (This is convenient, but is also needed
* if 'p' has been specified.) It should be noted that gzip(1)
* preserves file ownership and file mode.
*/
if ((log->flags & CE_COMPRESS) != 0) {
for (i = (log->flags & CE_PLAIN0) != 0; i < log->numhist; i++) {
snprintf(file1, sizeof(file1), "%s.%d", log->logfile, i);
if (lstat(file1, &st) != 0)
continue;
snprintf(file2, sizeof(file2), "%s.gz", file1);
if (lstat(file2, &st) == 0)
continue;
log_compress(log, file1);
}
}
log_trimmed(log);
/* Create the historical log file if we're maintaining history. */
if (log->numhist == 0) {
PRINFO(("rm -f %s\n", log->logfile));
if (!noaction)
if (unlink(log->logfile))
err(EXIT_FAILURE, "%s", log->logfile);
} else {
snprintf(file1, sizeof(file1), "%s.0", log->logfile);
PRINFO(("mv %s %s\n", log->logfile, file1));
if (!noaction)
if (rename(log->logfile, file1))
err(EXIT_FAILURE, "%s", log->logfile);
}
PRINFO(("(create new log)\n"));
log_create(log);
log_trimmed(log);
/* Set the correct permissions on the log. */
PRINFO(("chmod %o %s\n", log->mode, log->logfile));
if (!noaction)
if (chmod(log->logfile, log->mode))
err(EXIT_FAILURE, "%s", log->logfile);
/* Do we need to signal a daemon? */
if ((log->flags & CE_NOSIGNAL) == 0) {
if (log->pidfile[0] != '\0')
pid = readpidfile(log->pidfile);
else
pid = readpidfile(_PATH_SYSLOGDPID);
if (pid != (pid_t)-1) {
PRINFO(("kill -%s %lu\n",
sys_signame[log->signum], (u_long)pid));
if (!noaction)
if (kill(pid, log->signum))
warn("kill");
}
}
/* If the newest historical log is to be compressed, do it here. */
if ((log->flags & (CE_PLAIN0 | CE_COMPRESS)) == CE_COMPRESS
&& log->numhist != 0) {
snprintf(file1, sizeof(file1), "%s.0", log->logfile);
if ((log->flags & CE_NOSIGNAL) == 0) {
PRINFO(("sleep for 10 seconds before compressing...\n"));
sleep(10);
}
log_compress(log, file1);
}
}
/*
* Write an entry to the log file recording the fact that it was trimmed.
*/
void
log_trimmed(struct conf_entry *log)
{
FILE *fd;
time_t now;
char *daytime;
if ((log->flags & CE_BINARY) != 0)
return;
PRINFO(("(append rotation notice to %s)\n", log->logfile));
if (noaction)
return;
if ((fd = fopen(log->logfile, "at")) == NULL)
err(EXIT_FAILURE, "%s", log->logfile);
now = time(NULL);
daytime = ctime(&now) + 4;
daytime[15] = '\0';
fprintf(fd, "%s %s newsyslog[%lu]: log file turned over\n", daytime,
hostname, (u_long)getpid());
fclose(fd);
}
/*
* Create a new log file.
*/
void
log_create(struct conf_entry *log)
{
int fd;
if (noaction)
return;
if ((fd = creat(log->logfile, log->mode)) < 0)
err(EXIT_FAILURE, "%s", log->logfile);
if (fchown(fd, log->uid, log->gid) < 0)
err(EXIT_FAILURE, "%s", log->logfile);
close(fd);
}
/*
* Fork off gzip(1) to compress a log file. This routine takes an
* additional string argument (the name of the file to compress): it is also
* used to compress historical log files other than the newest.
*/
void
log_compress(struct conf_entry *log, const char *fn)
{
char tmp[MAXPATHLEN];
PRINFO(("gzip %s\n", fn));
if (!noaction) {
pid_t pid;
int status;
if ((pid = vfork()) < 0)
err(EXIT_FAILURE, "vfork");
else if (pid == 0) {
execl(_PATH_GZIP, "gzip", "-f", fn, NULL);
_exit(EXIT_FAILURE);
}
while (waitpid(pid, &status, 0) != pid);
if (!WIFEXITED(status) || (WEXITSTATUS(status) != 0))
errx(EXIT_FAILURE, "gzip failed");
}
snprintf(tmp, sizeof(tmp), "%s.gz", fn);
PRINFO(("chown %d:%d %s\n", log->uid, log->gid, tmp));
if (!noaction)
if (chown(tmp, log->uid, log->gid))
err(EXIT_FAILURE, "%s", tmp);
}
/*
* Display program usage information.
*/
void
usage(void)
{
fprintf(stderr,
"usage: newsyslog [-nrsvF] [-f config-file] [file ...]\n");
exit(EXIT_FAILURE);
}
/*
* Return non-zero if a string represents a decimal value.
*/
int
isnumber(const char *string)
{
while (isdigit((unsigned char)*string))
string++;
return (*string == '\0');
}
/*
* Given a signal name, attempt to find the corresponding signal number.
*/
int
getsig(const char *sig)
{
char *p;
int n;
if (isnumber(sig)) {
n = (int)strtol(sig, &p, 0);
if (p != '\0' || n < 0 || n >= NSIG)
return (-1);
return (n);
}
if (strncasecmp(sig, "SIG", 3) == 0)
sig += 3;
for (n = 1; n < NSIG; n++)
if (strcasecmp(sys_signame[n], sig) == 0)
return (n);
return (-1);
}
/*
* Given a path to a PID file, return the PID contained within.
*/
pid_t
readpidfile(const char *file)
{
FILE *fd;
char line[BUFSIZ];
pid_t pid;
#ifdef notyet
if (file[0] != '/')
snprintf(tmp, sizeof(tmp), "%s%s", _PATH_VARRUN, file);
else
strlcpy(tmp, file, sizeof(tmp));
#endif
if ((fd = fopen(file, "rt")) == NULL) {
warn("%s", file);
return (-1);
}
if (fgets(line, sizeof(line) - 1, fd) != NULL) {
line[sizeof(line) - 1] = '\0';
pid = (pid_t)strtol(line, NULL, 0);
} else {
warnx("unable to read %s", file);
pid = (pid_t)-1;
}
fclose(fd);
return (pid);
}
/*
* Parse a user:group specification.
*
* XXX This is over the top for newsyslog(8). It should be moved to libutil.
*/
int
parse_userspec(const char *name, struct passwd **pw, struct group **gr)
{
char buf[MAXLOGNAME * 2 + 2], *group;
strlcpy(buf, name, sizeof(buf));
*gr = NULL;
/*
* Before attempting to use '.' as a separator, see if the whole
* string resolves as a user name.
*/
if ((*pw = getpwnam(buf)) != NULL) {
*gr = getgrgid((*pw)->pw_gid);
return (0);
}
/* Split the user and group name. */
if ((group = strchr(buf, ':')) != NULL ||
(group = strchr(buf, '.')) != NULL)
*group++ = '\0';
if (isnumber(buf))
*pw = getpwuid((uid_t)atoi(buf));
else
*pw = getpwnam(buf);
/*
* Find the group. If a group wasn't specified, use the user's
* `natural' group. We get to this point even if no user was found.
* This is to allow the caller to get a better idea of what went
* wrong, if anything.
*/
if (group == NULL || *group == '\0') {
if (*pw == NULL)
return (-1);
*gr = getgrgid((*pw)->pw_gid);
} else if (isnumber(group))
*gr = getgrgid((gid_t)atoi(group));
else
*gr = getgrnam(group);
return (*pw != NULL && *gr != NULL ? 0 : -1);
}
/*
* Parse a cyclic time specification, the format is as follows:
*
* [Dhh] or [Wd[Dhh]] or [Mdd[Dhh]]
*
* to rotate a log file 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.
*/
time_t
parse_dwm(char *s)
{
char *t;
struct tm tm, *tmp;
u_long ul;
time_t now;
static int mtab[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };
int wmseen, dseen, nd, save;
wmseen = 0;
dseen = 0;
now = time(NULL);
tmp = localtime(&now);
tm = *tmp;
/* Set no. of days per month */
nd = mtab[tm.tm_mon];
if (tm.tm_mon == 1 &&
((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 ((time_t)-1);
dseen++;
s++;
ul = strtoul(s, &t, 10);
if (ul < 0 || ul > 23)
return ((time_t)-1);
tm.tm_hour = ul;
break;
case 'W':
if (wmseen)
return (-1);
wmseen++;
s++;
ul = strtoul(s, &t, 10);
if (ul < 0 || ul > 6)
return (-1);
if (ul != tm.tm_wday) {
if (ul < tm.tm_wday) {
save = 6 - tm.tm_wday;
save += (ul + 1);
} else
save = ul - 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((unsigned char)*s) == 'l') {
tm.tm_mday = nd;
s++;
t = s;
} else {
ul = strtoul(s, &t, 10);
if (ul < 1 || ul > 31)
return (-1);
if (ul > nd)
return (-1);
tm.tm_mday = ul;
}
break;
default:
return (-1);
break;
}
if (*t == '\0' || isspace((unsigned char)*t))
break;
else
s = t;
}
return (mktime(&tm));
}
/*
* 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.
*/
time_t
parse_iso8601(char *s)
{
char *t;
struct tm tm, *tmp;
u_long ul;
time_t now;
now = time(NULL);
tmp = localtime(&now);
tm = *tmp;
tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
ul = strtoul(s, &t, 10);
if (*t != '\0' && *t != 'T')
return ((time_t)-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;
/* FALLTHROUGH */
case 6:
tm.tm_year = tm.tm_year - (tm.tm_year % 100);
tm.tm_year += ul / 10000;
ul = ul % 10000;
/* FALLTHROUGH */
case 4:
tm.tm_mon = (ul / 100) - 1;
ul = ul % 100;
/* FALLTHROUGH */
case 2:
tm.tm_mday = ul;
/* FALLTHROUGH */
case 0:
break;
default:
return ((time_t)-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 ((time_t)-1);
if (*t != '\0') {
s = ++t;
ul = strtoul(s, &t, 10);
if (*t != '\0' && !isspace((unsigned char)*t))
return ((time_t)-1);
switch (t - s) {
case 6:
tm.tm_sec = ul % 100;
ul /= 100;
/* FALLTHROUGH */
case 4:
tm.tm_min = ul % 100;
ul /= 100;
/* FALLTHROUGH */
case 2:
tm.tm_hour = ul;
/* FALLTHROUGH */
case 0:
break;
default:
return ((time_t)-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 ((time_t)-1);
}
return (mktime(&tm));
}
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