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src/world/bin/chmod/src/chmod.c

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/* $OpenBSD: chmod.c,v 1.42 2017/05/28 08:03:36 awolk Exp $ */
/* $NetBSD: chmod.c,v 1.12 1995/03/21 09:02:09 cgd Exp $ */
/*
* Copyright (c) 1989, 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. 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/stat.h>
#include <sys/types.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <grp.h>
#include <libgen.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int ischflags, ischown, ischgrp, ischmod;
static const char *__progname;
gid_t a_gid(const char *);
uid_t a_uid(const char *, int);
static void usage(void);
int main(int argc, char *argv[]) {
FTS *ftsp;
FTSENT *p;
void *set;
unsigned long val;
int oct;
mode_t omode;
int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval, atflags;
uid_t uid;
gid_t gid;
u_int32_t fclear, fset;
char *ep, *mode, *cp, *flags;
__progname = basename(argv[0]);
if (strlen(__progname) > 2) {
ischown = __progname[2] == 'o';
ischgrp = __progname[2] == 'g';
ischmod = __progname[2] == 'm';
#if HAVE_CHFLAGS
ischflags = __progname[2] == 'f';
#else
ischflags = 0;
#endif
}
uid = (uid_t)-1;
gid = (gid_t)-1;
Hflag = Lflag = Rflag = fflag = hflag = 0;
while ((ch = getopt(argc, argv, "HLPRXfghorstuwx")) != -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': /* no longer documented. */
fflag = 1;
break;
case 'h':
hflag = 1;
break;
/*
* If this is a symbolic mode argument rather than
* an option, we are done with option processing.
*/
case 'g':
case 'o':
case 'r':
case 's':
case 't':
case 'u':
case 'w':
case 'X':
case 'x':
if (!ischmod)
usage();
/*
* If getopt() moved past the argument, back up.
* If the argument contains option letters before
* mode letters, setmode() will catch them.
*/
if (optind > 1) {
cp = argv[optind - 1];
if (cp[strlen(cp) - 1] == ch)
--optind;
}
goto done;
default:
usage();
}
done:
argv += optind;
argc -= optind;
if (argc < 2)
usage();
atflags = 0;
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;
atflags = 0;
}
} else if (!hflag) {
fts_options |= FTS_COMFOLLOW;
atflags = 0;
fts_options = FTS_LOGICAL;
}
#if HAVE_CHFLAGS
if (ischflags) {
if (pledge("stdio rpath fattr", NULL) == -1)
err(1, "pledge");
flags = *argv;
if (*flags >= '0' && *flags <= '7') {
errno = 0;
val = strtoul(flags, &ep, 8);
if (val > UINT_MAX)
errno = ERANGE;
if (errno)
err(1, "invalid flags: %s", flags);
if (*ep)
errx(1, "invalid flags: %s", flags);
fset = val;
oct = 1;
} else {
if (strtofflags(&flags, &fset, &fclear))
errx(1, "invalid flag: %s", flags);
fclear = ~fclear;
oct = 0;
}
} else if (ischmod) {
#else
if (ischmod) {
#endif
mode = *argv;
if (*mode >= '0' && *mode <= '7') {
errno = 0;
val = strtoul(mode, &ep, 8);
if (val > INT_MAX)
errno = ERANGE;
if (errno)
err(1, "invalid file mode: %s", mode);
if (*ep)
errx(1, "invalid file mode: %s", mode);
omode = val;
oct = 1;
} else {
if ((set = setmode(mode)) == NULL)
errx(1, "invalid file mode: %s", mode);
oct = 0;
}
} else if (ischown) {
/* Both UID and GID are given. */
if ((cp = strchr(*argv, ':')) != NULL) {
*cp++ = '\0';
gid = a_gid(cp);
}
/*
* UID and GID are separated by a dot and UID exists.
* required for backwards compatibility pre-dating POSIX.2
* likely to stay here forever
*/
else if ((cp = strchr(*argv, '.')) != NULL &&
(uid = a_uid(*argv, 1)) == (uid_t)-1) {
*cp++ = '\0';
gid = a_gid(cp);
}
if (uid == (uid_t)-1)
uid = a_uid(*argv, 0);
} else
gid = 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)
fts_set(ftsp, p, FTS_SKIP);
if (ischmod)
break;
else
continue;
case FTS_DNR: /* Warn, chmod, continue. */
warnc(p->fts_errno, "%s", p->fts_path);
rval = 1;
break;
case FTS_DP: /* Already changed at FTS_D. */
if (ischmod)
continue;
else
break;
case FTS_ERR: /* Warn, continue. */
case FTS_NS:
warnc(p->fts_errno, "%s", p->fts_path);
rval = 1;
continue;
case FTS_SL: /* Ignore. */
case FTS_SLNONE:
continue;
break;
default:
break;
}
if (ischmod) {
if (!fchmodat(AT_FDCWD, p->fts_accpath,
oct ? omode : getmode(set, p->fts_statp->st_mode),
atflags) ||
fflag)
continue;
} else if (!ischflags) {
if (!fchownat(AT_FDCWD, p->fts_accpath, uid, gid, atflags) || fflag)
continue;
#if HAVE_CHFLAGS
} else {
if (!chflagsat(AT_FDCWD, p->fts_accpath,
oct ? fset : (p->fts_statp->st_flags | fset) & fclear,
atflags))
continue;
#endif
}
/* error case */
warn("%s", p->fts_path);
rval = 1;
}
if (errno)
err(1, "fts_read");
fts_close(ftsp);
return (rval);
}
/*
* Given a UID or user name in a string, return the UID. If an empty string
* was given, returns -1. If silent is 0, exits on invalid user names/UIDs;
* otherwise, returns -1.
*/
uid_t a_uid(const char *s, int silent) {
struct passwd *pw;
const char *errstr;
uid_t uid;
if (*s == '\0') /* Argument was "[:.]gid". */
return ((uid_t)-1);
/* User name was given. */
if ((pw = getpwnam(s)) != NULL)
return (pw->pw_uid);
/* UID was given. */
uid = (uid_t)strtonum(s, 0, UID_MAX, &errstr);
if (errstr) {
if (silent)
return ((uid_t)-1);
else
errx(1, "user is %s: %s", errstr, s);
}
return (uid);
}
/*
* Given a GID or group name in a string, return the GID. If an empty string
* was given, returns -1. Exits on invalid user names/UIDs.
*/
gid_t a_gid(const char *s) {
struct group *gr;
const char *errstr;
gid_t gid;
if (*s == '\0') /* Argument was "uid[:.]". */
return ((gid_t)-1);
/* Group name was given. */
if ((gr = getgrnam(s)) != NULL)
return (gr->gr_gid);
/* GID was given. */
gid = (gid_t)strtonum(s, 0, GID_MAX, &errstr);
if (errstr)
errx(1, "group is %s: %s", errstr, s);
return (gid);
}
static void usage(void) {
fprintf(stderr, "usage: %s [-h] [-R [-H | -L | -P]] %s file ...\n",
__progname,
ischmod ? "mode"
: ischflags ? "flags" : ischown ? "owner[:group]" : "group");
if (ischown)
fprintf(stderr, " %s [-h] [-R [-H | -L | -P]] :group file ...\n",
__progname);
exit(1);
}
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