356 lines
8.5 KiB
C
356 lines
8.5 KiB
C
/* $OpenBSD: chmod.c,v 1.43 2018/09/16 02:44:06 millert Exp $ */
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/* $NetBSD: chmod.c,v 1.12 1995/03/21 09:02:09 cgd Exp $ */
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/*
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* Copyright (c) 1989, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <fts.h>
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#include <grp.h>
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#include <limits.h>
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#include <pwd.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int ischflags, ischown, ischgrp, ischmod;
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extern char *__progname;
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gid_t a_gid(const char *);
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uid_t a_uid(const char *, int);
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static void __dead usage(void);
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int
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main(int argc, char *argv[])
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{
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FTS *ftsp;
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FTSENT *p;
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void *set;
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unsigned long val;
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int oct;
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mode_t omode;
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int Hflag, Lflag, Rflag, ch, fflag, fts_options, hflag, rval, atflags;
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uid_t uid;
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gid_t gid;
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u_int32_t fclear, fset;
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char *ep, *mode, *cp, *flags;
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if (strlen(__progname) > 2) {
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ischown = __progname[2] == 'o';
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ischgrp = __progname[2] == 'g';
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ischmod = __progname[2] == 'm';
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ischflags = __progname[2] == 'f';
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}
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uid = (uid_t)-1;
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gid = (gid_t)-1;
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Hflag = Lflag = Rflag = fflag = hflag = 0;
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while ((ch = getopt(argc, argv, "HLPRXfghorstuwx")) != -1)
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switch (ch) {
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case 'H':
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Hflag = 1;
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Lflag = 0;
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break;
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case 'L':
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Lflag = 1;
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Hflag = 0;
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break;
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case 'P':
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Hflag = Lflag = 0;
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break;
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case 'R':
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Rflag = 1;
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break;
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case 'f': /* no longer documented. */
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fflag = 1;
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break;
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case 'h':
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hflag = 1;
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break;
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/*
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* If this is a symbolic mode argument rather than
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* an option, we are done with option processing.
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*/
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case 'g': case 'o': case 'r': case 's':
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case 't': case 'u': case 'w': case 'X': case 'x':
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if (!ischmod)
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usage();
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/*
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* If getopt() moved past the argument, back up.
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* If the argument contains option letters before
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* mode letters, setmode() will catch them.
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*/
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if (optind > 1) {
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cp = argv[optind - 1];
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if (cp[strlen(cp) - 1] == ch)
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--optind;
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}
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goto done;
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default:
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usage();
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}
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done:
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argv += optind;
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argc -= optind;
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if (argc < 2)
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usage();
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/*
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* We alter the symlink itself if doing -h or -RP, or
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* if doing -RH and the symlink wasn't a command line arg.
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*/
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atflags = AT_SYMLINK_NOFOLLOW;
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fts_options = FTS_PHYSICAL;
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if (Rflag) {
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if (hflag)
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errx(1,
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"the -R and -h options may not be specified together.");
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if (Hflag)
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fts_options |= FTS_COMFOLLOW;
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if (Lflag) {
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fts_options &= ~FTS_PHYSICAL;
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fts_options |= FTS_LOGICAL;
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atflags = 0;
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}
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} else if (!hflag) {
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fts_options |= FTS_COMFOLLOW;
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atflags = 0;
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}
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if (ischflags) {
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if (pledge("stdio rpath fattr", NULL) == -1)
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err(1, "pledge");
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flags = *argv;
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if (*flags >= '0' && *flags <= '7') {
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errno = 0;
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val = strtoul(flags, &ep, 8);
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if (val > UINT_MAX)
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errno = ERANGE;
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if (errno)
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err(1, "invalid flags: %s", flags);
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if (*ep)
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errx(1, "invalid flags: %s", flags);
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fset = val;
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oct = 1;
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} else {
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if (strtofflags(&flags, &fset, &fclear))
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errx(1, "invalid flag: %s", flags);
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fclear = ~fclear;
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oct = 0;
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}
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} else if (ischmod) {
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mode = *argv;
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if (*mode >= '0' && *mode <= '7') {
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errno = 0;
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val = strtoul(mode, &ep, 8);
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if (val > INT_MAX)
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errno = ERANGE;
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if (errno)
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err(1, "invalid file mode: %s", mode);
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if (*ep)
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errx(1, "invalid file mode: %s", mode);
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omode = val;
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oct = 1;
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} else {
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if ((set = setmode(mode)) == NULL)
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errx(1, "invalid file mode: %s", mode);
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oct = 0;
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}
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} else if (ischown) {
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/* Both UID and GID are given. */
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if ((cp = strchr(*argv, ':')) != NULL) {
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*cp++ = '\0';
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gid = a_gid(cp);
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}
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/*
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* UID and GID are separated by a dot and UID exists.
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* required for backwards compatibility pre-dating POSIX.2
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* likely to stay here forever
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*/
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else if ((cp = strchr(*argv, '.')) != NULL &&
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(uid = a_uid(*argv, 1)) == (uid_t)-1) {
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*cp++ = '\0';
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gid = a_gid(cp);
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}
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if (uid == (uid_t)-1)
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uid = a_uid(*argv, 0);
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} else
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gid = a_gid(*argv);
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if ((ftsp = fts_open(++argv, fts_options, 0)) == NULL)
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err(1, NULL);
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for (rval = 0; (p = fts_read(ftsp)) != NULL;) {
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switch (p->fts_info) {
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case FTS_D:
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if (!Rflag)
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fts_set(ftsp, p, FTS_SKIP);
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if (ischmod)
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break;
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else
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continue;
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case FTS_DNR: /* Warn, chmod, continue. */
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warnc(p->fts_errno, "%s", p->fts_path);
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rval = 1;
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break;
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case FTS_DP: /* Already changed at FTS_D. */
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if (ischmod)
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continue;
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else
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break;
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case FTS_ERR: /* Warn, continue. */
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case FTS_NS:
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warnc(p->fts_errno, "%s", p->fts_path);
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rval = 1;
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continue;
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case FTS_SL: /* Ignore. */
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case FTS_SLNONE:
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/*
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* The only symlinks that end up here are ones that
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* don't point to anything or that loop and ones
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* that we found doing a physical walk.
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*/
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if (!hflag && (fts_options & FTS_LOGICAL))
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continue;
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break;
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default:
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break;
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}
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/*
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* For -RH, the decision of how to handle symlinks depends
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* on the level: follow it iff it's a command line arg.
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*/
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if (fts_options & FTS_COMFOLLOW) {
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atflags = p->fts_level == FTS_ROOTLEVEL ? 0 :
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AT_SYMLINK_NOFOLLOW;
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}
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if (ischmod) {
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if (!fchmodat(AT_FDCWD, p->fts_accpath, oct ? omode :
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getmode(set, p->fts_statp->st_mode), atflags)
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|| fflag)
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continue;
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} else if (!ischflags) {
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if (!fchownat(AT_FDCWD, p->fts_accpath, uid, gid,
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atflags) || fflag)
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continue;
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} else {
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if (!chflagsat(AT_FDCWD, p->fts_accpath, oct ? fset :
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(p->fts_statp->st_flags | fset) & fclear, atflags))
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continue;
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}
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/* error case */
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warn("%s", p->fts_path);
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rval = 1;
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}
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if (errno)
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err(1, "fts_read");
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fts_close(ftsp);
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return (rval);
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}
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/*
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* Given a UID or user name in a string, return the UID. If an empty string
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* was given, returns -1. If silent is 0, exits on invalid user names/UIDs;
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* otherwise, returns -1.
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*/
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uid_t
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a_uid(const char *s, int silent)
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{
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const char *errstr;
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uid_t uid;
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if (*s == '\0') /* Argument was "[:.]gid". */
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return ((uid_t)-1);
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/* User name was given. */
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if (uid_from_user(s, &uid) != -1)
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return (uid);
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/* UID was given. */
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uid = (uid_t)strtonum(s, 0, UID_MAX, &errstr);
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if (errstr) {
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if (silent)
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return ((uid_t)-1);
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else
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errx(1, "user is %s: %s", errstr, s);
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}
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return (uid);
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}
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/*
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* Given a GID or group name in a string, return the GID. If an empty string
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* was given, returns -1. Exits on invalid user names/UIDs.
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*/
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gid_t
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a_gid(const char *s)
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{
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const char *errstr;
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gid_t gid;
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if (*s == '\0') /* Argument was "uid[:.]". */
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return ((gid_t)-1);
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/* Group name was given. */
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if (gid_from_group(s, &gid) != -1)
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return (gid);
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/* GID was given. */
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gid = (gid_t)strtonum(s, 0, GID_MAX, &errstr);
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if (errstr)
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errx(1, "group is %s: %s", errstr, s);
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return (gid);
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}
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static void __dead
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usage(void)
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{
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fprintf(stderr,
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"usage: %s [-h] [-R [-H | -L | -P]] %s file ...\n",
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__progname, ischmod ? "mode" : ischflags ? "flags" :
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ischown ? "owner[:group]" : "group");
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if (ischown)
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fprintf(stderr,
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" %s [-h] [-R [-H | -L | -P]] :group file ...\n",
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__progname);
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exit(1);
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}
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