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When rotating files or checking the age of a file, check for both
compressed and uncompressed logs but consult the flags to see which
we one prefer should both exist.  This keeps things from getting
hosed if someone compresses or uncompresses one of the archived log files.

/*	$OpenBSD: newsyslog.c,v 1.57 2002/09/21 23:19:43 millert Exp $	*/

/*
 * Copyright (c) 1999, 2002 Todd C. Miller <Todd.Miller@courtesan.com>
 * 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.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED ``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 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.
 */

/*
 * Copyright (c) 1997, Jason Downs.  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.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by Jason Downs for the
 *      OpenBSD system.
 * 4. Neither the name(s) of the author(s) nor the name OpenBSD
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR(S) ``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(S) 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 - roll over selected logs at the appropriate time,
 *              keeping the a specified number of backup files around.
 *
 */

#ifndef lint
static const char rcsid[] = "$OpenBSD: newsyslog.c,v 1.57 2002/09/21 23:19:43 millert Exp $";
#endif /* not lint */

#ifndef CONF
#define CONF "/etc/newsyslog.conf" /* Configuration file */
#endif
#ifndef PIDFILE
#define PIDFILE "/etc/syslog.pid"
#endif
#ifndef COMPRESS
#define COMPRESS "/usr/bin/compress" /* File compression program */
#endif
#ifndef COMPRESS_POSTFIX
#define COMPRESS_POSTFIX ".Z"
#endif
#ifndef STATS_DIR
#define STATS_DIR "/etc"
#endif
#ifndef SENDMAIL
#define SENDMAIL "/usr/lib/sendmail"
#endif

#include <sys/param.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/wait.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define CE_ROTATED	0x01		/* Log file has been rotated */
#define CE_COMPACT	0x02		/* Compact the achived log files */
#define CE_BINARY	0x04		/* Logfile is in binary, don't add */
					/* status messages */
#define CE_MONITOR	0x08		/* Monitory for changes */
#define CE_FOLLOW	0x10		/* Follow symbolic links */

#define	MIN_PID		4		/* Don't touch pids lower than this */
#define	MIN_SIZE	512		/* Don't rotate if smaller than this */

#define	DPRINTF(x)	do { if (verbose) printf x ; } while (0)

struct conf_entry {
	char    *log;		/* Name of the log */
	char    *logbase;	/* Basename of the log */
	char    *backdir;	/* Directory in which to store backups */
	uid_t   uid;		/* Owner of log */
	gid_t   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 */
	int     permissions;	/* File permissions on the log */
	int	signal;		/* Signal to send (defaults to SIGHUP) */
	int     flags;		/* Flags (CE_COMPACT & CE_BINARY)  */
	char	*whom;		/* Whom to notify if logfile changes */
	char	*pidfile;	/* Path to file containg pid to signal */
	char	*runcmd;	/* Command to run instead of sending a signal */
	struct conf_entry *next; /* Linked list pointer */
};

struct pidinfo {
	char	*file;
	int	signal;
};

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	monitormode = 0;	/* Don't do monitoring by default */
int	force = 0;		/* Force the logs to be rotated */
char	*conf = CONF;		/* Configuration file to use */
time_t	timenow;
char	hostname[MAXHOSTNAMELEN]; /* hostname */
char	*daytime;		/* timenow in human readable form */
char	*arcdir;		/* dir to put archives in (if it exists) */

void do_entry(struct conf_entry *);
void parse_args(int, char **);
void usage(void);
struct conf_entry *parse_file(int *);
char *missing_field(char *, char *);
void dotrim(struct conf_entry *);
int log_trim(char *);
void compress_log(struct conf_entry *);
int sizefile(char *);
int age_old_log(struct conf_entry *);
char *sob(char *);
char *son(char *);
int isnumberstr(char *);
void domonitor(char *, char *);
FILE *openmail(void);
void child_killer(int);
void run_command(char *);
void send_signal(char *, int);
char *lstat_log(char *, size_t, int);
int stat_suffix(char *, size_t, char *, struct stat *, int (*)());

int
main(int argc, char **argv)
{
	struct conf_entry *p, *q, *x, *y;
	struct pidinfo *pidlist, *pl;
	char **av;
	int status, listlen;
	
	parse_args(argc, argv);
	argc -= optind;
	argv += optind;

	if (needroot && getuid() && geteuid())
		errx(1, "You must be root.");

	p = parse_file(&listlen);
	if (argc > 0) {
		/* Only rotate specified files. */
		x = y = NULL;
		listlen = 0;
		for (av = argv; *av; av++) {
			for (q = p; q; q = q->next)
				if (strcmp(*av, q->log) == 0) {
					if (x == NULL)
						x = y = q;
					else {
						y->next = q;
						y = q;
					}
					listlen++;
					break;
				}
			if (q == NULL)
				warnx("%s is not listed in %s", *av, conf);
		}
		if (x == NULL)
			errx(1, "no specified log files found in %s", conf);
		y->next = NULL;
		p = x;
	}

	pidlist = (struct pidinfo *)calloc(listlen + 1, sizeof(struct pidinfo));
	if (pidlist == NULL)
		err(1, "calloc");

	signal(SIGCHLD, child_killer);

	/* Step 1, rotate all log files */
	for (q = p; q; q = q->next)
		do_entry(q);

	/* Step 2, make a list of unique pid files */
	for (q = p, pl = pidlist; q; ) {
		if (q->flags & CE_ROTATED) {
			struct pidinfo *pltmp;

			for (pltmp = pidlist; pltmp < pl; pltmp++) {
				if ((q->pidfile &&
				    strcmp(pltmp->file, q->pidfile) == 0 &&
				    pltmp->signal == q->signal) ||
				    (q->runcmd &&
				    strcmp(q->runcmd, pltmp->file) == 0))
					break;
			}
			if (pltmp == pl) {	/* unique entry */
				if (q->runcmd) {
					pl->file = q->runcmd;
					pl->signal = -1;
				} else {
					pl->file = q->pidfile;
					pl->signal = q->signal;
				}
				pl++;
			}
		}
		q = q->next;
	}

	/* Step 3, send a signal or run a command */
	for (pl = pidlist; pl->file; pl++) {
		if (pl->file != NULL) {
			if (pl->signal == -1)
				run_command(pl->file);
			else
				send_signal(pl->file, pl->signal);
		}
	}
	if (!noaction)
		sleep(5);

	/* Step 4, compress the log.0 file if configured to do so and free */
	while (p) {
		if ((p->flags & CE_COMPACT) && (p->flags & CE_ROTATED))
			compress_log(p);
		q = p;
		p = p->next;
		free(q);
	}

	/* Wait for children to finish, then exit */
	while (waitpid(-1, &status, 0) != -1)
		;
	exit(0);
}

void
do_entry(struct conf_entry *ent)
{
	int modtime, size;
	struct stat sb;

	if (lstat(ent->log, &sb) != 0)
		return;
	if (!S_ISREG(sb.st_mode) &&
	    (!S_ISLNK(sb.st_mode) || !(ent->flags & CE_FOLLOW))) {
		DPRINTF(("--> not a regular file, skipping\n"));
		return;
	}

	DPRINTF(("%s <%d%s%s%s>: ", ent->log, ent->numlogs,
	    (ent->flags & CE_COMPACT) ? "Z" : "",
	    (ent->flags & CE_BINARY) ? "B" : "",
	    (ent->flags & CE_FOLLOW) ? "F" : ""));

	size = sizefile(ent->log);
	modtime = age_old_log(ent);
	if (size < 0) {
		DPRINTF(("does not exist.\n"));
	} else {
		if (ent->size > 0)
			DPRINTF(("size (Kb): %d [%d] ", size, ent->size));
		if (ent->hours > 0)
			DPRINTF(("age (hr): %d [%d] ", modtime, ent->hours));
		if (monitormode && ent->flags & CE_MONITOR)
			domonitor(ent->log, ent->whom);
		if (!monitormode && (force ||
		    (ent->size > 0 && size >= ent->size) ||
		    (ent->hours > 0 && (modtime >= ent->hours || modtime < 0)
		    && ((ent->flags & CE_BINARY) || size >= MIN_SIZE)))) {
			DPRINTF(("--> trimming log....\n"));
			if (noaction && !verbose)
				printf("%s <%d%s%s%s>\n", ent->log,
				    ent->numlogs,
				    (ent->flags & CE_COMPACT) ? "Z" : "",
				    (ent->flags & CE_BINARY) ? "B" : "",
				    (ent->flags & CE_FOLLOW) ? "F" : "");
			dotrim(ent);
			ent->flags |= CE_ROTATED;
		} else
			DPRINTF(("--> skipping\n"));
	}
}

/* Run the specified command */
void
run_command(char *cmd)
{
	if (noaction)
		(void)printf("run %s\n", cmd);
	else
		system(cmd);
}

/* Send a signal to the pid specified by pidfile */
void
send_signal(char *pidfile, int signal)
{
	pid_t pid;
	FILE *f;
	char line[BUFSIZ], *ep, *err;
	unsigned long ulval;

	if ((f = fopen(pidfile, "r")) == NULL) {
		warn("can't open %s", pidfile);
		return;
	}

	pid = 0;
	errno = 0;
	err = NULL;
	if (fgets(line, sizeof(line), f)) {
		ulval = strtoul(line, &ep, 10);
		if (line[0] == '\0' || (*ep != '\0' && *ep != '\n'))
			err = "invalid number in";
		else if (errno == ERANGE && ulval == ULONG_MAX)
			err = "out of range number in";
		else if (ulval == 0)
			err = "no number in";
		else if (ulval < MIN_PID)
			err = "preposterous process number in";
		else
			pid = ulval;
	} else {
		if (errno == 0)
			err = "empty";
		else
			err = "error reading";
	}
	(void)fclose(f);

	if (err)
		warnx("%s pid file: %s", err, pidfile);
	else if (noaction)
		(void)printf("kill -%s %ld\n", sys_signame[signal], (long)pid);
	else if (kill(pid, signal))
		warnx("warning - could not send SIG%s to daemon",
		    sys_signame[signal]);
}

void
parse_args(int argc, char **argv)
{
	int ch;
	char *p;

	timenow = time(NULL);
	daytime = ctime(&timenow) + 4;
	daytime[15] = '\0';

	/* Let's get our hostname */
	(void)gethostname(hostname, sizeof(hostname));

	/* Truncate domain */
	if ((p = strchr(hostname, '.')) != NULL)
		*p = '\0';

	while ((ch = getopt(argc, argv, "Fmnrva:f:")) != -1) {
		switch (ch) {
		case 'a':
			arcdir = optarg;
			break;
		case 'n':
			noaction++; /* This implies needroot as off */
			/* fall through */
		case 'r':
			needroot = 0;
			break;
		case 'v':
			verbose++;
			break;
		case 'f':
			conf = optarg;
			break;
		case 'm':
			monitormode++;
			break;
		case 'F':
			force++;
			break;
		default:
			usage();
		}
	}
	if (monitormode && force)
		errx(1, "cannot specify both -m and -F flags");
}

void
usage(void)
{
	extern const char *__progname;

	(void)fprintf(stderr, "usage: %s [-Fmnrv] [-a directory] "
	    "[-f config_file] [log ...]\n", __progname);
	exit(1);
}

/*
 * Parse a configuration file and return a linked list of all the logs
 * to process
 */
struct conf_entry *
parse_file(int *nentries)
{
	FILE *f;
	char line[BUFSIZ], *parse, *q, *errline, *group, *tmp;
	struct conf_entry *first = NULL;
	struct conf_entry *working = NULL;
	struct passwd *pwd;
	struct group *grp;
	struct stat sb;

	if (strcmp(conf, "-") == 0)
		f = stdin;
	else if ((f = fopen(conf, "r")) == NULL)
		err(1, "can't open %s", conf);

	*nentries = 0;
	while (fgets(line, sizeof(line), f)) {
		tmp = sob(line);
		if (*tmp == '\0' || *tmp == '#')
			continue;
		errline = strdup(tmp);
		if (errline == NULL)
			err(1, "strdup");
		(*nentries)++;
		if (!first) {
			working = (struct conf_entry *) malloc(sizeof(struct conf_entry));
			if (working == NULL)
				err(1, "malloc");
			first = working;
		} else {
			working->next = (struct conf_entry *) malloc(sizeof(struct conf_entry));
			if (working->next == NULL)
				err(1, "malloc");
			working = working->next;
		}

		q = parse = missing_field(sob(line), errline);
		*(parse = son(line)) = '\0';
		working->log = strdup(q);
		if (working->log == NULL)
			err(1, "strdup");

		if ((working->logbase = strrchr(working->log, '/')) != NULL)
			working->logbase++;

		q = parse = missing_field(sob(++parse), errline);
		*(parse = son(parse)) = '\0';
		if ((group = strchr(q, '.')) != NULL) {
			*group++ = '\0';
			if (*q) {
				if (!(isnumberstr(q))) {
					if ((pwd = getpwnam(q)) == NULL)
						errx(1, "Error in config file; unknown user: %s", q);
					working->uid = pwd->pw_uid;
				} else
					working->uid = atoi(q);
			} else
				working->uid = (uid_t)-1;
			
			q = group;
			if (*q) {
				if (!(isnumberstr(q))) {
					if ((grp = getgrnam(q)) == NULL)
						errx(1, "Error in config file; unknown group: %s", q);
					working->gid = grp->gr_gid;
				} else
					working->gid = atoi(q);
			} else
				working->gid = (gid_t)-1;
			
			q = parse = missing_field(sob(++parse), errline);
			*(parse = son(parse)) = '\0';
		} else {
			working->uid = (uid_t)-1;
			working->gid = (gid_t)-1;
		}

		if (!sscanf(q, "%o", &working->permissions))
			errx(1, "Error in config file; bad permissions: %s", q);

		q = parse = missing_field(sob(++parse), errline);
		*(parse = son(parse)) = '\0';
		if (!sscanf(q, "%d", &working->numlogs) || working->numlogs < 0)
			errx(1, "Error in config file; bad number: %s", q);

		q = parse = missing_field(sob(++parse), errline);
		*(parse = son(parse)) = '\0';
		if (isdigit(*q))
			working->size = atoi(q);
		else
			working->size = -1;
		
		q = parse = missing_field(sob(++parse), errline);
		*(parse = son(parse)) = '\0';
		if (isdigit(*q))
			working->hours = atoi(q);
		else
			working->hours = -1;

		working->flags = 0;
		q = sob(++parse);	/* Optional field */
		if (*q == 'Z' || *q == 'z' || *q == 'B' || *q == 'b' ||
		    *q == 'M' || *q == 'm') {
			*(parse = son(q)) = '\0';
			while (*q) {
				switch (*q) {
				case 'Z':
				case 'z':
					working->flags |= CE_COMPACT;
					break;
				case 'B':
				case 'b':
					working->flags |= CE_BINARY;
					break;
				case 'M':
				case 'm':
					working->flags |= CE_MONITOR;
					break;
				case 'F':
				case 'f':
					working->flags |= CE_FOLLOW;
					break;
				default:
					errx(1, "Illegal flag in config file: %c", *q);
					break;
				}
				q++;
			}
		} else
			parse--;	/* no flags so undo */

		working->whom = NULL;
		if (working->flags & CE_MONITOR) {	/* Optional field */
			q = parse = sob(++parse);
			*(parse = son(parse)) = '\0';

			working->whom = strdup(q);
			if (working->log == NULL)
				err(1, "strdup");
		}

		working->pidfile = PIDFILE;
		working->signal = SIGHUP;
		working->runcmd = NULL;
		for (;;) {
			q = parse = sob(++parse);	/* Optional field */
			if (q == NULL || *q == '\0')
				break;
			if (*q == '/') {
				*(parse = son(parse)) = '\0';
				if (strlen(q) >= MAXPATHLEN)
					errx(1, "%s: pathname too long", q);
				working->pidfile = strdup(q);
				if (working->pidfile == NULL)
					err(1, "strdup");
			} else if (*q == '"' && (tmp = strchr(q + 1, '"'))) {
				*(parse = tmp) = '\0';
				if (*++q != '\0') {
					working->runcmd = strdup(q);
					if (working->runcmd == NULL)
						err(1, "strdup");
				}
				working->pidfile = NULL;
				working->signal = -1;
			} else if (strncmp(q, "SIG", 3) == 0) {
				int i;

				*(parse = son(parse)) = '\0';
				for (i = 1; i < NSIG; i++) {
					if (!strcmp(sys_signame[i], q + 3)) {
						working->signal = i;
						break;
					}
				}
				if (i == NSIG)
					errx(1, "unknown signal: %s", q);
			} else
				errx(1, "unrecognized field: %s", q);
		}
		free(errline);

		/* If there is an arcdir, set working->backdir. */
		if (arcdir != NULL && working->logbase != NULL) {
			if (*arcdir == '/') {
				/* Fully qualified arcdir */
				working->backdir = arcdir;
			} else {
				/* arcdir is relative to log's parent dir */
				*(working->logbase - 1) = '\0';
				if ((asprintf(&working->backdir, "%s/%s",
				    working->log, arcdir)) == -1)
					err(1, "malloc");
				*(working->logbase - 1) = '/';
			}
			/* Ignore arcdir if it doesn't exist. */
			if (stat(working->backdir, &sb) != 0 ||
			    !S_ISDIR(sb.st_mode)) {
				if (working->backdir != arcdir)
					free(working->backdir);
				working->backdir = NULL;
			}
		} else
			working->backdir = NULL;

		/* Make sure we can't oflow MAXPATHLEN */
		if (working->backdir != NULL) {
			if (snprintf(line, sizeof(line), "%s/%s.%d%s",
			    working->backdir, working->logbase,
			    working->numlogs, COMPRESS_POSTFIX) >= MAXPATHLEN)
				errx(1, "%s: pathname too long", working->log);
		} else {
			if (snprintf(line, sizeof(line), "%s.%d%s",
			    working->log, working->numlogs, COMPRESS_POSTFIX)
			    >= MAXPATHLEN)
				errx(1, "%s: pathname too long", working->log);
		}
	}
	if (working)
		working->next = NULL;
	(void)fclose(f);
	return (first);
}

char *
missing_field(char *p, char *errline)
{
	if (!p || !*p) {
		warnx("Missing field in config file line:");
		fputs(errline, stderr);
		exit(1);
	}
	return (p);
}

void
dotrim(struct conf_entry *ent)
{
	char    file1[MAXPATHLEN], file2[MAXPATHLEN];
	char    oldlog[MAXPATHLEN], *suffix;
	int     fd;
	int	numdays = ent->numlogs;

	/* Is there a separate backup dir? */
	if (ent->backdir != NULL)
		snprintf(oldlog, sizeof(oldlog), "%s/%s", ent->backdir,
		    ent->logbase);
	else
		strlcpy(oldlog, ent->log, sizeof(oldlog));

	/* Remove oldest log (may not exist) */
	(void)snprintf(file1, sizeof(file1), "%s.%d", oldlog, numdays);
	(void)snprintf(file2, sizeof(file2), "%s.%d%s", oldlog, numdays,
	    COMPRESS_POSTFIX);

	if (noaction) {
		printf("\trm -f %s %s\n", file1, file2);
	} else {
		(void)unlink(file1);
		(void)unlink(file2);
	}

	/* Move down log files */
	while (numdays--) {
		/*
		 * If both the compressed archive or the non-compressed archive
		 * exist, we one or the other based on the CE_COMPACT flag.
		 */
		(void)snprintf(file1, sizeof(file1), "%s.%d", oldlog, numdays);
		suffix = lstat_log(file1, sizeof(file1), ent->flags);
		if (suffix == NULL)
			continue;
		(void)snprintf(file2, sizeof(file2), "%s.%d%s", oldlog,
		    numdays + 1, suffix);

		if (noaction) {
			printf("\tmv %s %s\n", file1, file2);
			printf("\tchmod %o %s\n", ent->permissions, file2);
			if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
				printf("\tchown %u:%u %s\n",
				    ent->uid, ent->gid, file2);
		} else {
			if (rename(file1, file2))
				warn("can't mv %s to %s", file1, file2);
			if (chmod(file2, ent->permissions))
				warn("can't chmod %s", file2);
			if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
				if (chown(file2, ent->uid, ent->gid))
					warn("can't chown %s", file2);
		}
	}
	if (!noaction && !(ent->flags & CE_BINARY))
		(void)log_trim(ent->log);  /* Report the trimming to the old log */

	(void)snprintf(file2, sizeof(file2), "%s.XXXXXXXXXX", ent->log);
	if (noaction)  {
		printf("\tmktemp %s\n", file2);
	} else {
		if ((fd = mkstemp(file2)) < 0)
			err(1, "can't start '%s' log", file2);
		if (ent->uid != (uid_t)-1 || ent->gid != (gid_t)-1)
			if (fchown(fd, ent->uid, ent->gid))
			    err(1, "can't chown '%s' log file", file2);
		if (fchmod(fd, ent->permissions))
			err(1, "can't chmod '%s' log file", file2);
		(void)close(fd);
		/* Add status message */
		if (!(ent->flags & CE_BINARY) && log_trim(file2))
			err(1, "can't add status message to log '%s'", file2);
	}

	if (ent->numlogs == 0) {
		if (noaction)
			printf("\trm %s\n", ent->log);
		else if (unlink(ent->log))
			warn("can't rm %s", ent->log);
	} else {
		(void)snprintf(file1, sizeof(file1), "%s.0", oldlog);
		if (noaction)
			printf("\tmv %s to %s\n", ent->log, file1);
		else if (rename(ent->log, file1))
			warn("can't to mv %s to %s", ent->log, file1);
	}

	/* Now move the new log file into place */
	if (noaction)
		printf("\tmv %s to %s\n", file2, ent->log);
	else if (rename(file2, ent->log))
		warn("can't to mv %s to %s", file2, ent->log);
}

/* Log the fact that the logs were turned over */
int
log_trim(char *log)
{
	FILE    *f;

	if ((f = fopen(log, "a")) == NULL)
		return (-1);
	(void)fprintf(f, "%s %s newsyslog[%ld]: logfile turned over\n",
	    daytime, hostname, (long)getpid());
	if (fclose(f) == EOF)
		err(1, "log_trim: fclose");
	return (0);
}

/* Fork off compress or gzip to compress the old log file */
void
compress_log(struct conf_entry *ent)
{
	pid_t pid;
	char *base, tmp[MAXPATHLEN];

	if (ent->backdir != NULL)
		snprintf(tmp, sizeof(tmp), "%s/%s.0", ent->backdir,
		    ent->logbase);
	else
		snprintf(tmp, sizeof(tmp), "%s.0", ent->log);

	if ((base = strrchr(COMPRESS, '/')) == NULL)
		base = COMPRESS;
	else
		base++;
	if (noaction) {
		printf("%s %s\n", base, tmp);
		return;
	}
	pid = fork();
	if (pid < 0) {
		err(1, "fork");
	} else if (pid == 0) {
		(void)execl(COMPRESS, base, "-f", tmp, (char *)NULL);
		warn(COMPRESS);
		_exit(1);
	}
}

/* Return size in kilobytes of a file */
int
sizefile(char *file)
{
	struct stat sb;

	if (stat(file, &sb) < 0)
		return (-1);
	return (sb.st_blocks / (1024.0 / DEV_BSIZE));
}

/* Return the age (in hours) of old log file (file.0), or -1 if none */
int
age_old_log(struct conf_entry *ent)
{
	struct stat sb;
	char file[MAXPATHLEN];

	if (ent->backdir != NULL)
		(void)snprintf(file, sizeof(file), "%s/%s.0", ent->backdir,
		    ent->logbase);
	else
		(void)snprintf(file, sizeof(file), "%s.0", ent->log);
	if (ent->flags & CE_COMPACT) {
		if (stat_suffix(file, sizeof(file), COMPRESS_POSTFIX, &sb,
		    stat) < 0 && stat(file, &sb) < 0)
			return (-1);
	} else {
		if (stat(file, &sb) < 0 && stat_suffix(file, sizeof(file),
		    COMPRESS_POSTFIX, &sb, stat) < 0)
			return (-1);
	}
	return ((int)(timenow - sb.st_mtime + 1800) / 3600);
}

/* 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);
}

/* Check if string is actually a number */
int
isnumberstr(char *string)
{
	while (*string) {
		if (!isdigit(*string++))
			return (0);
	}
	return (1);
}

void
domonitor(char *log, char *whom)
{
	struct stat sb, tsb;
	char fname[MAXPATHLEN], *flog, *p, *rb = NULL;
	FILE *fp;
	off_t osize;
	int rd;

	if (stat(log, &sb) < 0)
		return;

	flog = strdup(log);
	if (flog == NULL)
		err(1, "strdup");

	for (p = flog; *p != '\0'; p++) {
		if (*p == '/')
			*p = '_';
	}
	snprintf(fname, sizeof(fname), "%s/newsyslog.%s.size",
	    STATS_DIR, flog);

	/* ..if it doesn't exist, simply record the current size. */
	if ((sb.st_size == 0) || stat(fname, &tsb) < 0)
		goto update;

	fp = fopen(fname, "r");
	if (fp == NULL) {
		warn("%s", fname);
		goto cleanup;
	}
#ifdef QUAD_OFF_T
	if (fscanf(fp, "%qd\n", &osize) != 1) {
#else
	if (fscanf(fp, "%ld\n", &osize) != 1) {
#endif	/* QUAD_OFF_T */
		fclose(fp);
		goto update;
	}

	fclose(fp);

	/* If the file is smaller, mark the entire thing as changed. */
	if (sb.st_size < osize)
		osize = 0;

	/* Now see if current size is larger. */
	if (sb.st_size > osize) {
		rb = (char *) malloc(sb.st_size - osize);
		if (rb == NULL)
			err(1, "malloc");

		/* Open logfile, seek. */
		fp = fopen(log, "r");
		if (fp == NULL) {
			warn("%s", log);
			goto cleanup;
		}
		fseek(fp, osize, SEEK_SET);
		rd = fread(rb, 1, sb.st_size - osize, fp);
		if (rd < 1) {
			warn("fread");
			fclose(fp);
			goto cleanup;
		}
		
		/* Send message. */
		fclose(fp);

		fp = openmail();
		if (fp == NULL) {
			warn("openmail");
			goto cleanup;
		}
		fprintf(fp, "To: %s\nSubject: LOGFILE NOTIFICATION: %s\n\n\n",
		    whom, log);
		fwrite(rb, 1, rd, fp);
		fputs("\n\n", fp);

		pclose(fp);
	}
update:
	/* Reopen for writing and update file. */
	fp = fopen(fname, "w");
	if (fp == NULL) {
		warn("%s", fname);
		goto cleanup;
	}
#ifdef QUAD_OFF_T
	fprintf(fp, "%qd\n", sb.st_size);
#else
	fprintf(fp, "%ld\n", sb.st_size);
#endif	/* QUAD_OFF_T */
	fclose(fp);

cleanup:
	free(flog);
	if (rb != NULL)
		free(rb);
}

FILE *
openmail(void)
{
	FILE *ret;
	char *cmdbuf = NULL;

	asprintf(&cmdbuf, "%s -t", SENDMAIL);
	if (cmdbuf) {
		ret = popen(cmdbuf, "w");
		free(cmdbuf);
		return (ret);
	}
	return (NULL);
}

void
child_killer(int signo)
{
	int save_errno = errno;
	int status;

	while (waitpid(-1, &status, WNOHANG) > 0)
		;
	errno = save_errno;
}

int
stat_suffix(char *file, size_t size, char *suffix, struct stat *sp, int (*func)())
{
	size_t n;

	n = strlcat(file, suffix, size);
	if (n < size && func(file, sp) == 0)
		return (0);
	file[n - strlen(suffix)] = '\0';
	return (-1);
}

/*
 * lstat() a log, possibily appending a suffix; order is based on flags.
 * Returns the suffix appended (may be empty string) or NULL if no file.
 */
char *
lstat_log(char *file, size_t size, int flags)
{
	struct stat sb;

	if (flags & CE_COMPACT) {
		if (stat_suffix(file, size, COMPRESS_POSTFIX, &sb, lstat) == 0)
			return (COMPRESS_POSTFIX);
		if (lstat(file, &sb) == 0)
			return ("");
	} else {
		if (lstat(file, &sb) == 0)
			return ("");
		if (stat_suffix(file, size, COMPRESS_POSTFIX, &sb, lstat) == 0)
			return (COMPRESS_POSTFIX);

	}
	return (NULL);
}