429 lines
11 KiB
C
429 lines
11 KiB
C
/* $NetBSD: utils.c,v 1.41 2012/01/04 15:58:37 christos 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 1.41 2012/01/04 15:58:37 christos 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 <sys/extattr.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 <stdbool.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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#define MMAP_MAX_SIZE (8 * 1048576)
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#define MMAP_MAX_WRITE (64 * 1024)
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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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struct finfo {
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const char *from;
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const char *to;
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size_t size;
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};
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static void
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progress(const struct finfo *fi, size_t written)
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{
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int pcent = (int)((100.0 * written) / fi->size);
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pinfo = 0;
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(void)fprintf(stderr, "%s => %s %zu/%zu bytes %d%% written\n",
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fi->from, fi->to, written, fi->size, pcent);
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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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char *p;
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size_t ptotal = 0;
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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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(void)close(from_fd);
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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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/* if hard linking then simply close the open fds, link and return */
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if (lflag) {
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(void)close(from_fd);
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(void)close(to_fd);
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(void)unlink(to.p_path);
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if (link(entp->fts_path, to.p_path)) {
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warn("%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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/* NOTREACHED */
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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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struct finfo fi;
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fi.from = entp->fts_path;
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fi.to = to.p_path;
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fi.size = (size_t)fs->st_size;
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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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bool use_read;
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use_read = true;
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if (fs->st_size <= MMAP_MAX_SIZE) {
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size_t fsize = (size_t)fs->st_size;
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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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size_t remainder;
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use_read = false;
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#if !defined(__minix)
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(void) madvise(p, (size_t)fs->st_size,
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MADV_SEQUENTIAL);
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#endif /* !defined(__minix) */
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/*
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* Write out the data in small chunks to
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* avoid locking the output file for a
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* long time if the reading the data from
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* the source is slow.
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*/
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remainder = fsize;
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do {
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ssize_t chunk;
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chunk = (remainder > MMAP_MAX_WRITE) ?
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MMAP_MAX_WRITE : remainder;
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if (write(to_fd, &p[fsize - remainder],
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chunk) != chunk) {
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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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remainder -= chunk;
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ptotal += chunk;
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if (pinfo)
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progress(&fi, ptotal);
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} while (remainder > 0);
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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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}
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if (use_read) {
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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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ptotal += wcount;
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if (pinfo)
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progress(&fi, ptotal);
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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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#if !defined(__minix)
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if (pflag && (fcpxattr(from_fd, to_fd) != 0))
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warn("%s: error copying extended attributes", to.p_path);
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#endif /* !defined(__minix) */
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(void)close(from_fd);
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if (rval == 1) {
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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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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 !defined(__minix)
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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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#endif /* !defined(__minix) */
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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] [-alNpv] src target\n"
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" %s [-R [-H | -L | -P]] [-f | -i] [-alNpv] 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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