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6a834fc3f1
documented and is incompatible with gnu cp. It has very few good effects (it recovers some disk space) and many bad ones: - special files are unlinked after certain errors. - the data may not be recoverable if the source is a special file or fifo. - unlinking destroys the target attributes as well as the target data. - unlinking doesn't actually remove the target data if the target is multiply linked.
287 lines
7.4 KiB
C
287 lines
7.4 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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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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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* $Id: utils.c,v 1.3 1995/05/30 00:06:22 rgrimes Exp $
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*/
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#ifndef lint
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static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/time.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 <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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#include "extern.h"
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int
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copy_file(entp, dne)
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FTSENT *entp;
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int dne;
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{
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static char buf[MAXBSIZE];
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struct stat to_stat, *fs;
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int ch, checkch, from_fd, rcount, rval, to_fd, wcount;
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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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if (iflag) {
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(void)fprintf(stderr, "overwrite %s? ", to.p_path);
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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') {
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(void)close(from_fd);
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return (0);
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}
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}
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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 (fs->st_size <= 8 * 1048576) {
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if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
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0, from_fd, (off_t)0)) == (char *)-1) {
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warn("%s", entp->fts_path);
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rval = 1;
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} else {
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if (write(to_fd, p, fs->st_size) != fs->st_size) {
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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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while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
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wcount = write(to_fd, buf, rcount);
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if (rcount != wcount || wcount == -1) {
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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 irreplacable. 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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/*
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* If the source was setuid or setgid, lose the bits unless the
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* copy is owned by the same user and group.
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*/
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#define RETAINBITS \
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(S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
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else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid)
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if (fstat(to_fd, &to_stat)) {
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warn("%s", to.p_path);
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rval = 1;
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} else if (fs->st_gid == to_stat.st_gid &&
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fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) {
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warn("%s", to.p_path);
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rval = 1;
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}
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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(p, exists)
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FTSENT *p;
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int exists;
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{
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int len;
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char link[MAXPATHLEN];
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if ((len = readlink(p->fts_path, link, sizeof(link))) == -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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link[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(link, to.p_path)) {
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warn("symlink: %s", link);
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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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copy_fifo(from_stat, exists)
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struct stat *from_stat;
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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, 0) : 0);
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}
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int
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copy_special(from_stat, exists)
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struct stat *from_stat;
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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, 0) : 0);
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}
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int
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setfile(fs, fd)
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register struct stat *fs;
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int fd;
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{
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static struct timeval tv[2];
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int rval;
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rval = 0;
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fs->st_mode &= S_ISUID | S_ISGID | 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 (utimes(to.p_path, tv)) {
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warn("utimes: %s", to.p_path);
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rval = 1;
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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 (fd ? fchown(fd, 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 (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
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warn("chown: %s", to.p_path);
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rval = 1;
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}
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if (fd ?
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fchflags(fd, fs->st_flags) : 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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void
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usage()
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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] [-fip] src target",
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" cp [-R [-H | -L | -P] [-fip] src1 ... srcN directory");
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exit(1);
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}
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