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/* $NetBSD: chown.c,v 1.8 2012/10/24 01:12:51 enami Exp $ */

/*
* Copyright (c) 1988, 1993, 1994, 2003
* 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. 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.
*/

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1988, 1993, 1994, 2003\
The Regents of the University of California. All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94";
#else
__RCSID("$NetBSD: chown.c,v 1.8 2012/10/24 01:12:51 enami Exp $");
#endif
#endif /* not lint */

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

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

static void a_gid(const char *);
static void a_uid(const char *);
static id_t id(const char *, const char *);
__dead static void usage(void);

static uid_t uid;
static gid_t gid;
static int ischown;
static const char *myname;

struct option chown_longopts[] = {
{ "reference", required_argument, 0,
1 },
{ NULL, 0, 0,
0 },
};

int
chown_main(int argc, char **argv)
{
FTS *ftsp;
FTSENT *p;
int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval, vflag;
char *cp, *reference;
int (*change_owner)(const char *, uid_t, gid_t);

setprogname(*argv);

(void)setlocale(LC_ALL, "");

myname = getprogname();
ischown = (myname[2] == 'o');
reference = NULL;

Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
while ((ch = getopt_long(argc, argv, "HLPRfhv",
chown_longopts, NULL)) != -1)
switch (ch) {
case 1:
reference = optarg;
break;
case 'H':
Hflag = 1;
Lflag = 0;
break;
case 'L':
Lflag = 1;
Hflag = 0;
break;
case 'P':
Hflag = Lflag = 0;
break;
case 'R':
Rflag = 1;
break;
case 'f':
fflag = 1;
break;
case 'h':
/*
* In System V the -h option causes chown/chgrp to
* change the owner/group of the symbolic link.
* 4.4BSD's symbolic links didn't have owners/groups,
* so it was an undocumented noop.
* In NetBSD 1.3, lchown(2) is introduced.
*/
hflag = 1;
break;
case 'v':
vflag = 1;
break;
case '?':
default:
usage();
}
argv += optind;
argc -= optind;

if (argc == 0 || (argc == 1 && reference == NULL))
usage();

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

uid = (uid_t)-1;
gid = (gid_t)-1;
if (reference == NULL) {
if (ischown) {
if ((cp = strchr(*argv, ':')) != NULL) {
*cp++ = '\0';
a_gid(cp);
}
#ifdef SUPPORT_DOT
else if ((cp = strrchr(*argv, '.')) != NULL) {
if (uid_from_user(*argv, &uid) == -1) {
*cp++ = '\0';
a_gid(cp);
}
}
#endif
a_uid(*argv);
} else
a_gid(*argv);
argv++;
} else {
struct stat st;

if (stat(reference, &st) == -1)
err(EXIT_FAILURE, "Cannot stat `%s'", reference);
if (ischown)
uid = st.st_uid;
gid = st.st_gid;
}

if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
err(EXIT_FAILURE, "fts_open");

for (rval = EXIT_SUCCESS; (p = fts_read(ftsp)) != NULL;) {
change_owner = chown;
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 = EXIT_FAILURE;
break;
case FTS_ERR: /* Warn, continue. */
case FTS_NS:
warnx("%s: %s", p->fts_path, strerror(p->fts_errno));
rval = EXIT_FAILURE;
continue;
case FTS_SL: /* Ignore unless -h. */
/*
* All symlinks we found while doing a physical
* walk end up here.
*/
if (!hflag)
continue;
/*
* Note that if we follow a symlink, fts_info is
* not FTS_SL but FTS_F or whatever. And we should
* use lchown only for FTS_SL and should use chown
* for others.
*/
change_owner = lchown;
break;
case FTS_SLNONE: /* Ignore. */
/*
* The only symlinks that end up here are ones that
* don't point to anything. Note that if we are
* doing a phisycal walk, we never reach here unless
* we asked to follow explicitly.
*/
continue;
default:
break;
}

if ((*change_owner)(p->fts_accpath, uid, gid) && !fflag) {
warn("%s", p->fts_path);
rval = EXIT_FAILURE;
} else {
if (vflag)
printf("%s\n", p->fts_path);
}
}
if (errno)
err(EXIT_FAILURE, "fts_read");
exit(rval);
/* NOTREACHED */
}

static void
a_gid(const char *s)
{
struct group *gr;

if (*s == '\0') /* Argument was "uid[:.]". */
return;
gr = *s == '#' ? NULL : getgrnam(s);
if (gr == NULL)
gid = id(s, "group");
else
gid = gr->gr_gid;
return;
}

static void
a_uid(const char *s)
{
if (*s == '\0') /* Argument was "[:.]gid". */
return;
if (*s == '#' || uid_from_user(s, &uid) == -1) {
uid = id(s, "user");
}
return;
}

static id_t
id(const char *name, const char *type)
{
id_t val;
char *ep;

errno = 0;
if (*name == '#')
name++;
val = (id_t)strtoul(name, &ep, 10);
if (errno)
err(EXIT_FAILURE, "%s", name);
if (*ep != '\0')
errx(EXIT_FAILURE, "%s: invalid %s name", name, type);
return (val);
}

static void
usage(void)
{

(void)fprintf(stderr,
"Usage: %s [-R [-H | -L | -P]] [-fhv] %s file ...\n"
"\t%s [-R [-H | -L | -P]] [-fhv] --reference=rfile file ...\n",
myname, ischown ? "owner:group|owner|:group" : "group",
myname);
exit(EXIT_FAILURE);
}
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