efab5715bc
a very annoying property: if the source media is slow (like a slow network), the target file will be locked for the duration of the entire max 8MB write and cause processes attempting to e.g. stat() it to "tstile" (for several minutes in the worst case). Revisit this if/when vnode locking gets a little smarter. chs ok (although he would rather see vnode locking improvements, but that's a slightly larger project)
365 lines
9.4 KiB
C
365 lines
9.4 KiB
C
/* $NetBSD: utils.c,v 1.35 2010/10/22 17:56:06 pooka Exp $ */
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/*-
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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. 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/cdefs.h>
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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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#else
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__RCSID("$NetBSD: utils.c,v 1.35 2010/10/22 17:56:06 pooka Exp $");
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#endif
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#endif /* not lint */
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#include <sys/mman.h>
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#include <sys/param.h>
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#include <sys/stat.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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set_utimes(const char *file, struct stat *fs)
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{
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static struct timeval tv[2];
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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 (lutimes(file, tv)) {
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warn("lutimes: %s", file);
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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_file(FTSENT *entp, 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, tolnk, wcount;
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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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to_fd = -1;
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fs = entp->fts_statp;
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tolnk = ((Rflag && !(Lflag || Hflag)) || Pflag);
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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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struct stat sb;
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int sval;
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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' && 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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sval = tolnk ?
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lstat(to.p_path, &sb) : stat(to.p_path, &sb);
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if (sval == -1) {
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warn("stat: %s", to.p_path);
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return (1);
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}
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if (!(tolnk && S_ISLNK(sb.st_mode)))
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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 && (fflag || tolnk)) {
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/*
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* attempt to remove existing destination file name and
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* create a new file
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*/
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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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}
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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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* There's no reason to do anything other than close the file
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* now if it's empty, so let's not bother.
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*/
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if (fs->st_size > 0) {
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/*
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* Disable use of mmap. With the current vnode locking
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* scheme it has a very annoying property: if the source
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* media is slow (like a slow network), the target file
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* will be locked for the duration of the entire max 8MB
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* write and cause processes attempting to e.g. stat() it
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* to "tstile". Revisit when vnode locking gets a little
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* smarter.
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*/
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#ifdef VNODE_LOCKING_IS_SMARTER_NOW
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/*
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* Mmap and write if less than 8M (the limit is so
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* we don't totally trash memory on big files).
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* This is really a minor hack, but it wins some CPU back.
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*/
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if (fs->st_size <= 8 * 1048576) {
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size_t fsize = (size_t)fs->st_size;
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char *p;
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p = mmap(NULL, fsize, PROT_READ, MAP_FILE|MAP_SHARED,
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from_fd, (off_t)0);
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if (p == MAP_FAILED) {
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goto mmap_failed;
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} else {
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(void) madvise(p, (size_t)fs->st_size,
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MADV_SEQUENTIAL);
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if (write(to_fd, p, fsize) !=
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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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if (munmap(p, fsize) < 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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mmap_failed:
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#endif
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while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
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wcount = write(to_fd, buf, (size_t)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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#ifdef VNODE_LOCKING_IS_SMARTER_NOW
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}
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#endif
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}
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if (rval == 1) {
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(void)close(from_fd);
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(void)close(to_fd);
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return (1);
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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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if (!pflag && dne
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&& 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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}
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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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/* set the mod/access times now after close of the fd */
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if (pflag && set_utimes(to.p_path, fs)) {
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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(FTSENT *p, int exists)
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{
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int len;
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char target[MAXPATHLEN];
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if ((len = readlink(p->fts_path, target, sizeof(target)-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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target[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(target, to.p_path)) {
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warn("symlink: %s", target);
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return (1);
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}
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return (pflag ? setfile(p->fts_statp, 0) : 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, 0) : 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, 0) : 0);
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}
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/*
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* Function: setfile
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*
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* Purpose:
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* Set the owner/group/permissions for the "to" file to the information
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* in the stat structure. If fd is zero, also call set_utimes() to set
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* the mod/access times. If fd is non-zero, the caller must do a utimes
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* itself after close(fd).
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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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int rval, islink;
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rval = 0;
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islink = S_ISLNK(fs->st_mode);
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fs->st_mode &= S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
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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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lchown(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) : lchmod(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 (!islink && !Nflag) {
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unsigned long fflags = fs->st_flags;
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/*
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* XXX
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* NFS doesn't support chflags; ignore errors unless
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* there's reason to believe we're losing bits.
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* (Note, this still won't be right if the server
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* supports flags and we were trying to *remove* flags
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* on a file that we copied, i.e., that we didn't create.)
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*/
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errno = 0;
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if ((fd ? fchflags(fd, fflags) :
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chflags(to.p_path, fflags)) == -1)
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if (errno != EOPNOTSUPP || fs->st_flags != 0) {
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warn("chflags: %s", to.p_path);
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rval = 1;
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}
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}
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/* if fd is non-zero, caller must call set_utimes() after close() */
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if (fd == 0 && set_utimes(to.p_path, fs))
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rval = 1;
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return (rval);
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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,
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"usage: %s [-R [-H | -L | -P]] [-f | -i] [-Npv] src target\n"
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" %s [-R [-H | -L | -P]] [-f | -i] [-Npv] src1 ... srcN directory\n",
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getprogname(), getprogname());
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exit(1);
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/* NOTREACHED */
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}
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