freebsd-dev/usr.sbin/chown/chown.c
2002-12-30 10:16:56 +00:00

284 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";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/stat.h>
#include <err.h>
#include <errno.h>
#include <fts.h>
#include <grp.h>
#include <libgen.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
void a_gid(const char *);
void a_uid(const char *);
void chownerr(const char *);
u_long id(const char *, const char *);
void usage(void);
uid_t uid;
gid_t gid;
int ischown;
const char *gname;
int
main(int argc, char **argv)
{
FTS *ftsp;
FTSENT *p;
int Hflag, Lflag, Rflag, fflag, hflag, vflag;
int ch, fts_options, rval;
char *cp;
ischown = (strcmp(basename(argv[0]), "chown") == 0);
Hflag = Lflag = Rflag = fflag = hflag = vflag = 0;
while ((ch = getopt(argc, argv, "HLPRfhv")) != -1)
switch (ch) {
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':
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 && (Hflag || Lflag))
errx(1, "the -R%c and -h options may not be "
"specified together", Hflag ? 'H' : 'L');
if (Hflag)
fts_options |= FTS_COMFOLLOW;
else if (Lflag) {
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
}
} else
fts_options = hflag ? FTS_PHYSICAL : FTS_LOGICAL;
uid = (uid_t)-1;
gid = (gid_t)-1;
if (ischown) {
if ((cp = strchr(*argv, ':')) != NULL) {
*cp++ = '\0';
a_gid(cp);
}
#ifdef SUPPORT_DOT
else if ((cp = strchr(*argv, '.')) != NULL) {
warnx("separation of user and group with a period is deprecated");
*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. */
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:
/*
* 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 == (uid_t)-1 || uid == p->fts_statp->st_uid) &&
(gid == (gid_t)-1 || gid == p->fts_statp->st_gid))
continue;
if ((hflag ? lchown : chown)(p->fts_accpath, uid, gid) == -1) {
if (!fflag) {
chownerr(p->fts_path);
rval = 1;
}
} else {
if (vflag)
printf("%s\n", p->fts_path);
}
}
if (errno)
err(1, "fts_read");
exit(rval);
}
void
a_gid(const char *s)
{
struct group *gr;
if (*s == '\0') /* Argument was "uid[:.]". */
return;
gname = s;
gid = ((gr = getgrnam(s)) != NULL) ? gr->gr_gid : id(s, "group");
}
void
a_uid(const char *s)
{
struct passwd *pw;
if (*s == '\0') /* Argument was "[:.]gid". */
return;
uid = ((pw = getpwnam(s)) != NULL) ? pw->pw_uid : id(s, "user");
}
u_long
id(const char *name, const char *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(const char *file)
{
static uid_t euid = -1;
static int ngroups = -1;
gid_t groups[NGROUPS_MAX];
/* Check for chown without being root. */
if (errno != EPERM || (uid != (uid_t)-1 &&
euid == (uid_t)-1 && (euid = geteuid()) != 0)) {
warn("%s", file);
return;
}
/* Check group membership; kernel just returns EPERM. */
if (gid != (gid_t)-1 && ngroups == -1 &&
euid == (uid_t)-1 && (euid = geteuid()) != 0) {
ngroups = getgroups(NGROUPS_MAX, groups);
while (--ngroups >= 0 && gid != groups[ngroups]);
if (ngroups < 0) {
warnx("you are not a member of group %s", gname);
return;
}
}
warn("%s", file);
}
void
usage(void)
{
if (ischown)
(void)fprintf(stderr, "%s\n%s\n",
"usage: chown [-fhv] [-R [-H | -L | -P]] owner[:group]"
" file ...",
" chown [-fhv] [-R [-H | -L | -P]] :group file ...");
else
(void)fprintf(stderr, "%s\n",
"usage: chgrp [-fhv] [-R [-H | -L | -P]] group file ...");
exit(1);
}