/*	$OpenBSD: chown.c,v 1.10 1997/09/20 12:44:29 deraadt Exp $	*/

/*
 * Copyright (c) 1988, 1993, 1994
 *	The Regents of the University of California.  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 the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/* from: static char sccsid[] = "@(#)chown.c	8.8 (Berkeley) 4/4/94"; */
static char *rcsid = "$Id: chown.c,v 1.10 1997/09/20 12:44:29 deraadt Exp $";
#endif /* not lint */

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

#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <grp.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <locale.h>

void	a_gid __P((char *));
void	a_uid __P((char *));
void	usage __P((void));

uid_t uid;
gid_t gid;
int Rflag, ischown, fflag;
extern char *__progname;

int
main(argc, argv)
	int argc;
	char *argv[];
{
	FTS *ftsp;
	FTSENT *p;
	int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval;
	char *cp;
	
	setlocale(LC_ALL, "");

	ischown = __progname[2] == 'o';
	
	Hflag = Lflag = Pflag = hflag = 0;
	while ((ch = getopt(argc, argv, "HLPRfh")) != -1)
		switch (ch) {
		case 'H':
			Hflag = 1;
			Lflag = Pflag = 0;
			break;
		case 'L':
			Lflag = 1;
			Hflag = Pflag = 0;
			break;
		case 'P':
			Pflag = 1;
			Hflag = Lflag = 0;
			break;
		case 'R':
			Rflag = 1;
			break;
		case 'f':
			fflag = 1;
			break;
		case 'h':
			hflag = 1;
			break;
		case '?':
		default:
			usage();
		}
	argv += optind;
	argc -= optind;

	if (argc < 2)
		usage();

	fts_options = FTS_PHYSICAL;
	if (Rflag) {
		if (hflag)
			errx(1,
		"the -R and -h options may not be specified together.");
		if (Hflag)
			fts_options |= FTS_COMFOLLOW;
		if (Lflag) {
			fts_options &= ~FTS_PHYSICAL;
			fts_options |= FTS_LOGICAL;
		}
	}

	uid = gid = -1;
	if (ischown) {
		if ((cp = strchr(*argv, ':')) != NULL) {
			*cp++ = '\0';
			a_gid(cp);
		} 
#ifdef SUPPORT_DOT
		else if ((cp = strchr(*argv, '.')) != NULL) {
			*cp++ = '\0';
			a_gid(cp);
		}
#endif
		a_uid(*argv);
	} else 
		a_gid(*argv);

	if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
		err(1, NULL);

	for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
		switch (p->fts_info) {
		case FTS_D:
			if (!Rflag)		/* Change it at FTS_DP. */
				fts_set(ftsp, p, FTS_SKIP);
			continue;
		case FTS_DNR:			/* Warn, chown, continue. */
			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
			rval = 1;
			break;
		case FTS_ERR:			/* Warn, continue. */
		case FTS_NS:
			warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
			rval = 1;
			continue;
		case FTS_SL:
		case FTS_SLNONE:
			if (!hflag)
				continue;
			/*FALLTHROUGH*/
		default:
			break;
		}

		if ((hflag ? lchown(p->fts_accpath, uid, gid) :
		     chown(p->fts_accpath, uid, gid)) && !fflag) {
			warn("%s", p->fts_path);
			rval = 1;
		}
	}
	if (errno)
		err(1, "fts_read");
	exit(rval);
}

void
a_gid(s)
	char *s;
{
	struct group *gr;
	char *ep;
	u_long ul;

	if (*s == '\0')			/* Argument was "gid[:.]". */
		return;

	if ((gr = getgrnam(s)) != NULL) {
		gid = gr->gr_gid;
	} else {
		if ((ul = strtoul(s, &ep, 10)) == ULONG_MAX)
			err(1, "%s", s);
		if (*ep != '\0')
			errx(1, "%s: invalid group name", s);
		gid = (gid_t)ul;
	}
}

void
a_uid(s)
	char *s;
{
	struct passwd *pw;
	char *ep;
	u_long ul;

	if (*s == '\0')			/* Argument was "gid[:.]". */
		return;

	if ((pw = getpwnam(s)) != NULL) {
		uid = pw->pw_uid;
	} else {
		if ((ul = strtoul(s, &ep, 10)) == ULONG_MAX)
			err(1, "%s", s);
		if (*ep != '\0')
			errx(1, "%s: invalid user name", s);
		uid = (uid_t)ul;
	}
}

void
usage()
{

	(void)fprintf(stderr,
	    "usage: %s [-R [-H | -L | -P]] [-f] %s file ...\n",
	    __progname, ischown ? "[owner][:group]" : "group");
	exit(1);
}