297 lines
8.6 KiB
C
297 lines
8.6 KiB
C
/* $OpenBSD: utils.c,v 1.40 2017/06/27 21:43:46 tedu Exp $ */
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/* $NetBSD: utils.c,v 1.6 1997/02/26 14:40:51 cgd 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/mman.h>
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#include <sys/param.h> /* MAXBSIZE */
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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 <limits.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 copy_file(FTSENT *entp, int dne) {
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static char *buf;
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static char *zeroes;
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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 (!buf) {
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buf = malloc(MAXBSIZE);
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if (!buf)
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err(1, "malloc");
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}
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if (!zeroes) {
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zeroes = calloc(1, MAXBSIZE);
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if (!zeroes)
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err(1, "calloc");
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}
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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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* In -f (force) mode, we always unlink the destination first
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* if it exists. Note that -i and -f are mutually exclusive.
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*/
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if (!dne && fflag)
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(void)unlink(to.p_path);
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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 && !fflag) {
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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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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_ISTXT | 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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/* XXX broken for 0-size mmap */
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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, MAP_FILE | MAP_SHARED,
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from_fd, (off_t)0)) == MAP_FAILED) {
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warn("mmap: %s", entp->fts_path);
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rval = 1;
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} else {
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madvise(p, fs->st_size, MADV_SEQUENTIAL);
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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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int skipholes = 0;
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struct stat tosb;
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if (!fstat(to_fd, &tosb) && S_ISREG(tosb.st_mode))
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skipholes = 1;
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while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
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if (skipholes && memcmp(buf, zeroes, rcount) == 0)
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wcount = lseek(to_fd, rcount, SEEK_CUR) == -1 ? -1 : rcount;
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else
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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 (skipholes && rcount >= 0)
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rcount = ftruncate(to_fd, lseek(to_fd, 0, SEEK_CUR));
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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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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 (S_ISUID | S_ISGID | S_ISVTX | S_IRWXU | S_IRWXG | S_IRWXO)
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if (!pflag && dne && fs->st_mode & (S_ISUID | S_ISGID) &&
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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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return (rval);
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}
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int copy_link(FTSENT *p, int exists) {
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int len;
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char name[PATH_MAX];
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if ((len = readlink(p->fts_path, name, sizeof(name) - 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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name[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(name, to.p_path)) {
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warn("symlink: %s", name);
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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 copy_fifo(struct stat *from_stat, int exists) {
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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 copy_special(struct stat *from_stat, int exists) {
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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 setfile(struct stat *fs, int fd) {
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struct timespec ts[2];
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int rval;
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rval = 0;
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fs->st_mode &= S_ISTXT | S_ISUID | S_ISGID | S_IRWXU | S_IRWXG | S_IRWXO;
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ts[0] = fs->st_atim;
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ts[1] = fs->st_mtim;
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if (fd >= 0 ? futimens(fd, ts)
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: utimensat(AT_FDCWD, to.p_path, ts, AT_SYMLINK_NOFOLLOW)) {
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warn("update times: %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 >= 0 ? 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_ISTXT | S_ISUID | S_ISGID);
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}
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if (fd >= 0
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? fchmod(fd, fs->st_mode)
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: fchmodat(AT_FDCWD, to.p_path, fs->st_mode, AT_SYMLINK_NOFOLLOW)) {
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warn("chmod: %s", to.p_path);
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rval = 1;
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}
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#ifdef HAVE_CHFLAGS
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/*
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* XXX
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* NFS doesn't support chflags; ignore errors unless there's reason
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* to believe we're losing bits. (Note, this still won't be right
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* if the server 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 >= 0
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? fchflags(fd, fs->st_flags)
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: chflagsat(AT_FDCWD, to.p_path, fs->st_flags, AT_SYMLINK_NOFOLLOW))
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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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#endif
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return (rval);
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}
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