9b4261c9b4
This includes adding support for ACLs into cp(1) and mv(1) userspace utilities. For mv(1), if _PC_ACL_EXTENDED is in effect for the source AND destination operands, the destination file's ACLs shall reflect the source. For cp(1), if _PC_ACL_EXTENDED is in effect for both source and destination operands, and -p has been specified, the ACLs from the source shall be preserved on the destination. MFC after: 1 month
419 lines
11 KiB
C
419 lines
11 KiB
C
/*-
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* Copyright (c) 1991, 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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* 4. 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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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
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#endif
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#endif /* not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/acl.h>
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#include <sys/param.h>
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#include <sys/stat.h>
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#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
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#include <sys/mman.h>
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#endif
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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 <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sysexits.h>
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#include <unistd.h>
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#include "extern.h"
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#define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y))
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int
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copy_file(const FTSENT *entp, int dne)
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{
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static char buf[MAXBSIZE];
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struct stat *fs;
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int ch, checkch, from_fd, rcount, rval, to_fd;
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ssize_t wcount;
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size_t wresid;
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size_t wtotal;
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char *bufp;
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#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
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char *p;
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#endif
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if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
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warn("%s", entp->fts_path);
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return (1);
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}
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fs = entp->fts_statp;
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/*
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* If the file exists and we're interactive, verify with the user.
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* If the file DNE, set the mode to be the from file, minus setuid
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* bits, modified by the umask; arguably wrong, but it makes copying
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* executables work right and it's been that way forever. (The
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* other choice is 666 or'ed with the execute bits on the from file
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* modified by the umask.)
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*/
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if (!dne) {
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#define YESNO "(y/n [n]) "
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if (nflag) {
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if (vflag)
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printf("%s not overwritten\n", to.p_path);
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(void)close(from_fd);
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return (0);
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} else if (iflag) {
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(void)fprintf(stderr, "overwrite %s? %s",
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to.p_path, YESNO);
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checkch = ch = getchar();
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while (ch != '\n' && ch != EOF)
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ch = getchar();
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if (checkch != 'y' && checkch != 'Y') {
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(void)close(from_fd);
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(void)fprintf(stderr, "not overwritten\n");
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return (1);
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}
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}
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if (fflag) {
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/* remove existing destination file name,
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* create a new file */
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(void)unlink(to.p_path);
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to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
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fs->st_mode & ~(S_ISUID | S_ISGID));
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} else
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/* overwrite existing destination file name */
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to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
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} else
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to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
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fs->st_mode & ~(S_ISUID | S_ISGID));
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if (to_fd == -1) {
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warn("%s", to.p_path);
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(void)close(from_fd);
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return (1);
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}
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rval = 0;
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/*
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* Mmap and write if less than 8M (the limit is so we don't totally
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* trash memory on big files. This is really a minor hack, but it
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* wins some CPU back.
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*/
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#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
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if (S_ISREG(fs->st_mode) && fs->st_size > 0 &&
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fs->st_size <= 8 * 1048576) {
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if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
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MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
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warn("%s", entp->fts_path);
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rval = 1;
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} else {
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wtotal = 0;
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for (bufp = p, wresid = fs->st_size; ;
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bufp += wcount, wresid -= (size_t)wcount) {
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wcount = write(to_fd, bufp, wresid);
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wtotal += wcount;
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if (info) {
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info = 0;
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(void)fprintf(stderr,
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"%s -> %s %3d%%\n",
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entp->fts_path, to.p_path,
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cp_pct(wtotal, fs->st_size));
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}
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if (wcount >= (ssize_t)wresid || wcount <= 0)
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break;
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}
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if (wcount != (ssize_t)wresid) {
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warn("%s", to.p_path);
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rval = 1;
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}
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/* Some systems don't unmap on close(2). */
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if (munmap(p, fs->st_size) < 0) {
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warn("%s", entp->fts_path);
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rval = 1;
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}
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}
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} else
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#endif
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{
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wtotal = 0;
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while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
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for (bufp = buf, wresid = rcount; ;
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bufp += wcount, wresid -= wcount) {
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wcount = write(to_fd, bufp, wresid);
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wtotal += wcount;
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if (info) {
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info = 0;
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(void)fprintf(stderr,
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"%s -> %s %3d%%\n",
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entp->fts_path, to.p_path,
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cp_pct(wtotal, fs->st_size));
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}
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if (wcount >= (ssize_t)wresid || wcount <= 0)
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break;
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}
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if (wcount != (ssize_t)wresid) {
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warn("%s", to.p_path);
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rval = 1;
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break;
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}
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}
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if (rcount < 0) {
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warn("%s", entp->fts_path);
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rval = 1;
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}
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}
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/*
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* Don't remove the target even after an error. The target might
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* not be a regular file, or its attributes might be important,
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* or its contents might be irreplaceable. It would only be safe
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* to remove it if we created it and its length is 0.
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*/
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if (pflag && setfile(fs, to_fd))
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rval = 1;
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if (pflag && preserve_fd_acls(from_fd, to_fd) != 0)
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rval = 1;
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(void)close(from_fd);
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if (close(to_fd)) {
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warn("%s", to.p_path);
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rval = 1;
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}
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return (rval);
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}
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int
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copy_link(const FTSENT *p, int exists)
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{
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int len;
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char llink[PATH_MAX];
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if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) {
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warn("readlink: %s", p->fts_path);
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return (1);
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}
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llink[len] = '\0';
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if (exists && unlink(to.p_path)) {
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warn("unlink: %s", to.p_path);
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return (1);
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}
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if (symlink(llink, to.p_path)) {
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warn("symlink: %s", llink);
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return (1);
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}
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return (pflag ? setfile(p->fts_statp, -1) : 0);
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}
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int
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copy_fifo(struct stat *from_stat, int exists)
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{
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if (exists && unlink(to.p_path)) {
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warn("unlink: %s", to.p_path);
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return (1);
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}
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if (mkfifo(to.p_path, from_stat->st_mode)) {
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warn("mkfifo: %s", to.p_path);
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return (1);
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}
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return (pflag ? setfile(from_stat, -1) : 0);
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}
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int
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copy_special(struct stat *from_stat, int exists)
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{
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if (exists && unlink(to.p_path)) {
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warn("unlink: %s", to.p_path);
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return (1);
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}
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if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
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warn("mknod: %s", to.p_path);
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return (1);
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}
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return (pflag ? setfile(from_stat, -1) : 0);
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}
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int
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setfile(struct stat *fs, int fd)
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{
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static struct timeval tv[2];
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struct stat ts;
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int rval, gotstat, islink, fdval;
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rval = 0;
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fdval = fd != -1;
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islink = !fdval && S_ISLNK(fs->st_mode);
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fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
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S_IRWXU | S_IRWXG | S_IRWXO;
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TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
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TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
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if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) {
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warn("%sutimes: %s", islink ? "l" : "", to.p_path);
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rval = 1;
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}
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if (fdval ? fstat(fd, &ts) :
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(islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts)))
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gotstat = 0;
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else {
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gotstat = 1;
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ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
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S_IRWXU | S_IRWXG | S_IRWXO;
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}
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/*
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* Changing the ownership probably won't succeed, unless we're root
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* or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
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* the mode; current BSD behavior is to remove all setuid bits on
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* chown. If chown fails, lose setuid/setgid bits.
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*/
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if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
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if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) :
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(islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) :
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chown(to.p_path, fs->st_uid, fs->st_gid))) {
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if (errno != EPERM) {
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warn("chown: %s", to.p_path);
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rval = 1;
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}
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fs->st_mode &= ~(S_ISUID | S_ISGID);
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}
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if (!gotstat || fs->st_mode != ts.st_mode)
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if (fdval ? fchmod(fd, fs->st_mode) :
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(islink ? lchmod(to.p_path, fs->st_mode) :
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chmod(to.p_path, fs->st_mode))) {
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warn("chmod: %s", to.p_path);
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rval = 1;
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}
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if (!gotstat || fs->st_flags != ts.st_flags)
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if (fdval ?
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fchflags(fd, fs->st_flags) :
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(islink ? (errno = ENOSYS) :
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chflags(to.p_path, fs->st_flags))) {
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warn("chflags: %s", to.p_path);
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rval = 1;
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}
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return (rval);
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}
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int
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preserve_fd_acls(int source_fd, int dest_fd)
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{
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struct acl *aclp;
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acl_t acl;
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if (fpathconf(source_fd, _PC_ACL_EXTENDED) != 1 ||
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fpathconf(dest_fd, _PC_ACL_EXTENDED) != 1)
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return (0);
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acl = acl_get_fd(source_fd);
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if (acl == NULL) {
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warn("failed to get acl entries while setting %s", to.p_path);
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return (1);
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}
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aclp = &acl->ats_acl;
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if (aclp->acl_cnt == 3)
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return (0);
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if (acl_set_fd(dest_fd, acl) < 0) {
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warn("failed to set acl entries for %s", to.p_path);
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return (1);
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}
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return (0);
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}
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int
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preserve_dir_acls(struct stat *fs, char *source_dir, char *dest_dir)
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{
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acl_t (*aclgetf)(const char *, acl_type_t);
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int (*aclsetf)(const char *, acl_type_t, acl_t);
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struct acl *aclp;
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acl_t acl;
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if (pathconf(source_dir, _PC_ACL_EXTENDED) != 1 ||
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pathconf(dest_dir, _PC_ACL_EXTENDED) != 1)
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return (0);
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/*
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* If the file is a link we will not follow it
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*/
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if (S_ISLNK(fs->st_mode)) {
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aclgetf = acl_get_link_np;
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aclsetf = acl_set_link_np;
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} else {
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aclgetf = acl_get_file;
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aclsetf = acl_set_file;
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}
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/*
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* Even if there is no ACL_TYPE_DEFAULT entry here, a zero
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* size ACL will be returned. So it is not safe to simply
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* check the pointer to see if the default ACL is present.
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*/
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acl = aclgetf(source_dir, ACL_TYPE_DEFAULT);
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if (acl == NULL) {
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warn("failed to get default acl entries on %s",
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source_dir);
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return (1);
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}
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aclp = &acl->ats_acl;
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if (aclp->acl_cnt != 0 && aclsetf(dest_dir,
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ACL_TYPE_DEFAULT, acl) < 0) {
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warn("failed to set default acl entries on %s",
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dest_dir);
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return (1);
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}
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acl = aclgetf(source_dir, ACL_TYPE_ACCESS);
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if (acl == NULL) {
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warn("failed to get acl entries on %s", source_dir);
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return (1);
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}
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aclp = &acl->ats_acl;
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if (aclsetf(dest_dir, ACL_TYPE_ACCESS, acl) < 0) {
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warn("failed to set acl entries on %s", dest_dir);
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return (1);
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}
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return (0);
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}
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void
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usage(void)
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{
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(void)fprintf(stderr, "%s\n%s\n",
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"usage: cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file target_file",
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" cp [-R [-H | -L | -P]] [-f | -i | -n] [-pv] source_file ... "
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"target_directory");
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exit(EX_USAGE);
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}
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