OpenBSD-4.6/bin/cp/utils.c
/* $OpenBSD: utils.c,v 1.29 2007/09/22 21:10:49 sobrado Exp $ */
/* $NetBSD: utils.c,v 1.6 1997/02/26 14:40:51 cgd Exp $ */
/*-
* Copyright (c) 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
#else
static char rcsid[] = "$OpenBSD: utils.c,v 1.29 2007/09/22 21:10:49 sobrado Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
int
copy_file(FTSENT *entp, int dne)
{
static char *buf;
static char *zeroes;
struct stat to_stat, *fs;
int ch, checkch, from_fd, rcount, rval, to_fd, wcount;
#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
char *p;
#endif
if (!buf) {
buf = malloc(MAXBSIZE);
if (!buf)
err(1, "malloc");
}
if (!zeroes) {
zeroes = malloc(MAXBSIZE);
if (!zeroes)
err(1, "malloc");
memset(zeroes, 0, MAXBSIZE);
}
if ((from_fd = open(entp->fts_path, O_RDONLY, 0)) == -1) {
warn("%s", entp->fts_path);
return (1);
}
fs = entp->fts_statp;
/*
* In -f (force) mode, we always unlink the destination first
* if it exists. Note that -i and -f are mutually exclusive.
*/
if (!dne && fflag)
(void)unlink(to.p_path);
/*
* If the file exists and we're interactive, verify with the user.
* If the file DNE, set the mode to be the from file, minus setuid
* bits, modified by the umask; arguably wrong, but it makes copying
* executables work right and it's been that way forever. (The
* other choice is 666 or'ed with the execute bits on the from file
* modified by the umask.)
*/
if (!dne && !fflag) {
if (iflag) {
(void)fprintf(stderr, "overwrite %s? ", to.p_path);
checkch = ch = getchar();
while (ch != '\n' && ch != EOF)
ch = getchar();
if (checkch != 'y' && checkch != 'Y') {
(void)close(from_fd);
return (0);
}
}
to_fd = open(to.p_path, O_WRONLY | O_TRUNC, 0);
} else
to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT,
fs->st_mode & ~(S_ISTXT | S_ISUID | S_ISGID));
if (to_fd == -1) {
warn("%s", to.p_path);
(void)close(from_fd);
return (1);
}
rval = 0;
/*
* Mmap and write if less than 8M (the limit is so we don't totally
* trash memory on big files. This is really a minor hack, but it
* wins some CPU back.
*/
#ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
if (fs->st_size <= 8 * 1048576) {
if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
MAP_FILE|MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
warn("mmap: %s", entp->fts_path);
rval = 1;
} else {
madvise(p, fs->st_size, MADV_SEQUENTIAL);
if (write(to_fd, p, fs->st_size) != fs->st_size) {
warn("%s", to.p_path);
rval = 1;
}
/* Some systems don't unmap on close(2). */
if (munmap(p, fs->st_size) < 0) {
warn("%s", entp->fts_path);
rval = 1;
}
}
} else
#endif
{
int skipholes = 0;
struct stat tosb;
if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode))
skipholes = 1;
while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
if (skipholes && memcmp(buf, zeroes, rcount) == 0)
wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount;
else
wcount = write(to_fd, buf, rcount);
if (rcount != wcount || wcount == -1) {
warn("%s", to.p_path);
rval = 1;
break;
}
}
if (skipholes && rcount >= 0)
rcount = ftruncate(to_fd, fs->st_size);
if (rcount < 0) {
warn("%s", entp->fts_path);
rval = 1;
}
}
if (rval == 1) {
(void)close(from_fd);
(void)close(to_fd);
return (1);
}
if (pflag && setfile(fs, to_fd))
rval = 1;
/*
* If the source was setuid or setgid, lose the bits unless the
* copy is owned by the same user and group.
*/
#define RETAINBITS \
(S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
else if (fs->st_mode & (S_ISUID | S_ISGID) && fs->st_uid == myuid) {
if (fstat(to_fd, &to_stat)) {
warn("%s", to.p_path);
rval = 1;
} else if (fs->st_gid == to_stat.st_gid &&
fchmod(to_fd, fs->st_mode & RETAINBITS & ~myumask)) {
warn("%s", to.p_path);
rval = 1;
}
}
(void)close(from_fd);
if (close(to_fd)) {
warn("%s", to.p_path);
rval = 1;
}
return (rval);
}
int
copy_link(FTSENT *p, int exists)
{
int len;
char link[MAXPATHLEN];
if ((len = readlink(p->fts_path, link, sizeof(link)-1)) == -1) {
warn("readlink: %s", p->fts_path);
return (1);
}
link[len] = '\0';
if (exists && unlink(to.p_path)) {
warn("unlink: %s", to.p_path);
return (1);
}
if (symlink(link, to.p_path)) {
warn("symlink: %s", link);
return (1);
}
return (pflag ? setlink(p->fts_statp) : 0);
}
int
copy_fifo(struct stat *from_stat, int exists)
{
if (exists && unlink(to.p_path)) {
warn("unlink: %s", to.p_path);
return (1);
}
if (mkfifo(to.p_path, from_stat->st_mode)) {
warn("mkfifo: %s", to.p_path);
return (1);
}
return (pflag ? setfile(from_stat, 0) : 0);
}
int
copy_special(struct stat *from_stat, int exists)
{
if (exists && unlink(to.p_path)) {
warn("unlink: %s", to.p_path);
return (1);
}
if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
warn("mknod: %s", to.p_path);
return (1);
}
return (pflag ? setfile(from_stat, 0) : 0);
}
int
setfile(struct stat *fs, int fd)
{
static struct timeval tv[2];
int rval;
rval = 0;
fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
if (utimes(to.p_path, tv)) {
warn("utimes: %s", to.p_path);
rval = 1;
}
/*
* Changing the ownership probably won't succeed, unless we're root
* or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
* the mode; current BSD behavior is to remove all setuid bits on
* chown. If chown fails, lose setuid/setgid bits.
*/
if (fd ? fchown(fd, fs->st_uid, fs->st_gid) :
chown(to.p_path, fs->st_uid, fs->st_gid)) {
if (errno != EPERM) {
warn("chown: %s", to.p_path);
rval = 1;
}
fs->st_mode &= ~(S_ISTXT | S_ISUID | S_ISGID);
}
if (fd ? fchmod(fd, fs->st_mode) : chmod(to.p_path, fs->st_mode)) {
warn("chmod: %s", to.p_path);
rval = 1;
}
/*
* XXX
* NFS doesn't support chflags; ignore errors unless there's reason
* to believe we're losing bits. (Note, this still won't be right
* if the server supports flags and we were trying to *remove* flags
* on a file that we copied, i.e., that we didn't create.)
*/
errno = 0;
if (fd ? fchflags(fd, fs->st_flags) : chflags(to.p_path, fs->st_flags))
if (errno != EOPNOTSUPP || fs->st_flags != 0) {
warn("chflags: %s", to.p_path);
rval = 1;
}
return (rval);
}
int
setlink(struct stat *fs)
{
if (lchown(to.p_path, fs->st_uid, fs->st_gid)) {
if (errno != EPERM) {
warn("lchown: %s", to.p_path);
return (1);
}
}
return (0);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-fip] [-R [-H | -L | -P]] source target\n", __progname);
(void)fprintf(stderr,
" %s [-fip] [-R [-H | -L | -P]] source ... directory\n",
__progname);
exit(1);
}