freebsd-dev/usr.sbin/chown/chown.c
Ruslan Ermilov 01b4e93eff Fixed the bug from the previous revision.
``chown -h owner symlink'' did not set the symlink's owner
if the file the symlink points to already had that owner:

# ls -l alink afile
-rw-r--r--  1 nobody  ru  0 May 31 14:14 afile
lrwxr-xr-x  1 root    ru  5 May 31 14:14 alink -> afile
# ./chown -h -v nobody alink
# ls -l alink afile
-rw-r--r--  1 nobody  ru  0 May 31 14:14 afile
lrwxr-xr-x  1 root    ru  5 May 31 14:14 alink -> afile

Similarly for chgrp(1) and chmod(1).
2001-05-31 11:47:20 +00:00

287 lines
6.7 KiB
C

/*
* 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 const char copyright[] =
"@(#) Copyright (c) 1988, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)chown.c 8.8 (Berkeley) 4/4/94";
#else
static const char rcsid[] =
"$FreeBSD$";
#endif
#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>
void a_gid __P((char *));
void a_uid __P((char *));
void chownerr __P((char *));
u_long id __P((char *, char *));
void usage __P((void));
uid_t uid;
gid_t gid;
int Rflag, ischown, fflag, hflag, vflag;
char *gname, *myname;
int
main(argc, argv)
int argc;
char *argv[];
{
FTS *ftsp;
FTSENT *p;
int Hflag, Lflag, Pflag, ch, fts_options, hflag, rval;
char *cp;
myname = (cp = rindex(*argv, '/')) ? cp + 1 : *argv;
ischown = myname[2] == 'o';
Hflag = Lflag = Pflag = hflag = vflag = 0;
while ((ch = getopt(argc, argv, "HLPRfhv")) != -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 'v':
vflag = 1;
break;
case '?':
default:
usage();
}
argv += optind;
argc -= optind;
if (argc < 2)
usage();
if (Rflag) {
fts_options = FTS_PHYSICAL;
if (hflag && (Lflag || 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;
}
} else
fts_options = hflag ? FTS_PHYSICAL : 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: /* Change it at FTS_DP. */
if (!Rflag)
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: /* Ignore. */
case FTS_SLNONE:
/*
* The only symlinks that end up here are ones that
* don't point to anything and ones that we found
* doing a physical walk.
*/
if (hflag)
break;
else
continue;
default:
break;
}
if ((uid == -1 || uid == p->fts_statp->st_uid) &&
(gid == -1 || gid == p->fts_statp->st_gid))
continue;
if (hflag) {
if (lchown(p->fts_accpath, uid, gid) && !fflag) {
chownerr(p->fts_path);
rval = 1;
} else {
if (vflag)
(void)printf("%s\n", p->fts_accpath);
}
} else {
if (chown(p->fts_accpath, uid, gid) && !fflag) {
chownerr(p->fts_path);
rval = 1;
} else {
if (vflag)
(void)printf("%s\n", p->fts_accpath);
}
}
}
if (errno)
err(1, "fts_read");
exit(rval);
}
void
a_gid(s)
char *s;
{
struct group *gr;
if (*s == '\0') /* Argument was "uid[:.]". */
return;
gname = s;
gid = ((gr = getgrnam(s)) == NULL) ? id(s, "group") : gr->gr_gid;
}
void
a_uid(s)
char *s;
{
struct passwd *pw;
if (*s == '\0') /* Argument was "[:.]gid". */
return;
uid = ((pw = getpwnam(s)) == NULL) ? id(s, "user") : pw->pw_uid;
}
u_long
id(name, type)
char *name, *type;
{
u_long val;
char *ep;
/*
* XXX
* We know that uid_t's and gid_t's are unsigned longs.
*/
errno = 0;
val = strtoul(name, &ep, 10);
if (errno)
err(1, "%s", name);
if (*ep != '\0')
errx(1, "%s: illegal %s name", name, type);
return (val);
}
void
chownerr(file)
char *file;
{
static int euid = -1, ngroups = -1;
gid_t groups[NGROUPS];
/* Check for chown without being root. */
if (errno != EPERM ||
(uid != -1 && euid == -1 && (euid = geteuid()) != 0))
err(1, "%s", file);
/* Check group membership; kernel just returns EPERM. */
if (gid != -1 && ngroups == -1 &&
euid == -1 && (euid = geteuid()) != 0) {
ngroups = getgroups(NGROUPS, groups);
while (--ngroups >= 0 && gid != groups[ngroups]);
if (ngroups < 0)
errx(1, "you are not a member of group %s", gname);
}
warn("%s", file);
}
void
usage()
{
(void)fprintf(stderr, "%s\n%s\n%s\n",
"usage: chown [-R [-H | -L | -P]] [-f] [-h] [-v] owner[:group] file ...",
" chown [-R [-H | -L | -P]] [-f] [-h] [-v] :group file ...",
" chgrp [-R [-H | -L | -P]] [-f] [-h] [-v] group file ...");
exit(1);
}