| 1 | /*-
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| 2 | * Copyright (c) 1991, 1993, 1994
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| 3 | * The Regents of the University of California. All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | * 1. Redistributions of source code must retain the above copyright
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| 9 | * notice, this list of conditions and the following disclaimer.
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| 10 | * 2. Redistributions in binary form must reproduce the above copyright
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| 11 | * notice, this list of conditions and the following disclaimer in the
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| 12 | * documentation and/or other materials provided with the distribution.
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| 13 | * 4. Neither the name of the University nor the names of its contributors
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| 14 | * may be used to endorse or promote products derived from this software
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| 15 | * without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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| 18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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| 19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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| 20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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| 21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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| 22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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| 23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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| 24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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| 25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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| 26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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| 27 | * SUCH DAMAGE.
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| 28 | */
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| 29 |
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| 30 | #ifndef lint
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| 31 | #if 0
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| 32 | static char sccsid[] = "@(#)utils.c 8.3 (Berkeley) 4/1/94";
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| 33 | #include <sys/cdefs.h>
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| 34 | __FBSDID("$FreeBSD: src/bin/cp/utils.c,v 1.43 2004/04/06 20:06:44 markm Exp $");
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| 35 | #endif
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| 36 | #endif /* not lint */
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| 37 |
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| 38 | #include "config.h"
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| 39 | #ifndef _MSC_VER
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| 40 | # include <sys/param.h>
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| 41 | #endif
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| 42 | #include <sys/stat.h>
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| 43 | #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
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| 44 | # include <sys/mman.h>
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| 45 | #endif
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| 46 |
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| 47 | #include "err.h"
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| 48 | #include <errno.h>
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| 49 | #include <fcntl.h>
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| 50 | #include <fts.h>
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| 51 | #include <limits.h>
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| 52 | #include <stdio.h>
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| 53 | #include <stdlib.h>
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| 54 | #include <signal.h>
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| 55 | #include <sysexits.h>
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| 56 | #include <unistd.h>
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| 57 | #ifdef __sun__
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| 58 | # include "solfakes.h"
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| 59 | #endif
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| 60 | #ifdef _MSC_VER
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| 61 | # define MSC_DO_64_BIT_IO
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| 62 | # include "mscfakes.h"
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| 63 | #endif
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| 64 | #include "cp_extern.h"
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| 65 | #include "cmp_extern.h"
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| 66 |
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| 67 | #define cp_pct(x,y) (int)(100.0 * (double)(x) / (double)(y))
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| 68 |
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| 69 | #ifndef MAXBSIZE
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| 70 | # define MAXBSIZE 0x20000
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| 71 | #endif
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| 72 | #ifndef O_BINARY
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| 73 | # define O_BINARY 0
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| 74 | #endif
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| 75 |
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| 76 | #ifndef S_ISVTX
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| 77 | # define S_ISVTX 0
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| 78 | #endif
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| 79 |
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| 80 |
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| 81 | int
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| 82 | copy_file(const FTSENT *entp, int dne, int changed_only, int *pcopied)
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| 83 | {
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| 84 | static char buf[MAXBSIZE];
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| 85 | struct stat *fs;
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| 86 | int ch, checkch, from_fd, rcount, rval, to_fd;
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| 87 | ssize_t wcount;
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| 88 | size_t wresid;
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| 89 | size_t wtotal;
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| 90 | char *bufp;
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| 91 | #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
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| 92 | char *p;
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| 93 | #endif
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| 94 |
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| 95 | *pcopied = 0;
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| 96 |
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| 97 | if ((from_fd = open(entp->fts_path, O_RDONLY | O_BINARY, 0)) == -1) {
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| 98 | warn("%s", entp->fts_path);
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| 99 | return (1);
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| 100 | }
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| 101 |
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| 102 | fs = entp->fts_statp;
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| 103 |
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| 104 | /*
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| 105 | * If the file exists and we're interactive, verify with the user.
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| 106 | * If the file DNE, set the mode to be the from file, minus setuid
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| 107 | * bits, modified by the umask; arguably wrong, but it makes copying
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| 108 | * executables work right and it's been that way forever. (The
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| 109 | * other choice is 666 or'ed with the execute bits on the from file
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| 110 | * modified by the umask.)
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| 111 | */
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| 112 | if (!dne) {
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| 113 | /* compare the files first if requested */
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| 114 | if (changed_only) {
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| 115 | if (cmp_fd_and_file(from_fd, entp->fts_path, to.p_path,
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| 116 | 1 /* silent */, 0 /* lflag */,
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| 117 | 0 /* special */) == OK_EXIT) {
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| 118 | close(from_fd);
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| 119 | return (0);
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| 120 | }
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| 121 | if (lseek(from_fd, 0, SEEK_SET) != 0) {
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| 122 | close(from_fd);
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| 123 | if ((from_fd = open(entp->fts_path, O_RDONLY | O_BINARY, 0)) == -1) {
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| 124 | warn("%s", entp->fts_path);
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| 125 | return (1);
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| 126 | }
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| 127 | }
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| 128 | }
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| 129 |
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| 130 | #define YESNO "(y/n [n]) "
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| 131 | if (nflag) {
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| 132 | if (vflag)
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| 133 | printf("%s not overwritten\n", to.p_path);
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| 134 | return (0);
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| 135 | } else if (iflag) {
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| 136 | (void)fprintf(stderr, "overwrite %s? %s",
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| 137 | to.p_path, YESNO);
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| 138 | checkch = ch = getchar();
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| 139 | while (ch != '\n' && ch != EOF)
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| 140 | ch = getchar();
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| 141 | if (checkch != 'y' && checkch != 'Y') {
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| 142 | (void)close(from_fd);
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| 143 | (void)fprintf(stderr, "not overwritten\n");
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| 144 | return (1);
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| 145 | }
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| 146 | }
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| 147 |
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| 148 | if (fflag) {
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| 149 | /* remove existing destination file name,
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| 150 | * create a new file */
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| 151 | (void)unlink(to.p_path);
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| 152 | to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT | O_BINARY,
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| 153 | fs->st_mode & ~(S_ISUID | S_ISGID));
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| 154 | } else
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| 155 | /* overwrite existing destination file name */
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| 156 | to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_BINARY, 0);
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| 157 | } else
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| 158 | to_fd = open(to.p_path, O_WRONLY | O_TRUNC | O_CREAT | O_BINARY,
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| 159 | fs->st_mode & ~(S_ISUID | S_ISGID));
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| 160 |
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| 161 | if (to_fd == -1) {
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| 162 | warn("%s", to.p_path);
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| 163 | (void)close(from_fd);
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| 164 | return (1);
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| 165 | }
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| 166 |
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| 167 | rval = 0;
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| 168 | *pcopied = 1;
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| 169 |
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| 170 | /*
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| 171 | * Mmap and write if less than 8M (the limit is so we don't totally
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| 172 | * trash memory on big files. This is really a minor hack, but it
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| 173 | * wins some CPU back.
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| 174 | */
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| 175 | #ifdef VM_AND_BUFFER_CACHE_SYNCHRONIZED
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| 176 | if (S_ISREG(fs->st_mode) && fs->st_size > 0 &&
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| 177 | fs->st_size <= 8 * 1048576) {
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| 178 | if ((p = mmap(NULL, (size_t)fs->st_size, PROT_READ,
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| 179 | MAP_SHARED, from_fd, (off_t)0)) == MAP_FAILED) {
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| 180 | warn("%s", entp->fts_path);
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| 181 | rval = 1;
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| 182 | } else {
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| 183 | wtotal = 0;
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| 184 | for (bufp = p, wresid = fs->st_size; ;
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| 185 | bufp += wcount, wresid -= (size_t)wcount) {
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| 186 | wcount = write(to_fd, bufp, wresid);
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| 187 | wtotal += wcount;
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| 188 | if (info) {
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| 189 | info = 0;
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| 190 | (void)fprintf(stderr,
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| 191 | "%s -> %s %3d%%\n",
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| 192 | entp->fts_path, to.p_path,
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| 193 | cp_pct(wtotal, fs->st_size));
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| 194 |
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| 195 | }
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| 196 | if (wcount >= (ssize_t)wresid || wcount <= 0)
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| 197 | break;
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| 198 | }
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| 199 | if (wcount != (ssize_t)wresid) {
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| 200 | warn("%s", to.p_path);
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| 201 | rval = 1;
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| 202 | }
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| 203 | /* Some systems don't unmap on close(2). */
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| 204 | if (munmap(p, fs->st_size) < 0) {
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| 205 | warn("%s", entp->fts_path);
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| 206 | rval = 1;
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| 207 | }
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| 208 | }
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| 209 | } else
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| 210 | #endif
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| 211 | {
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| 212 | wtotal = 0;
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| 213 | while ((rcount = read(from_fd, buf, MAXBSIZE)) > 0) {
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| 214 | for (bufp = buf, wresid = rcount; ;
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| 215 | bufp += wcount, wresid -= wcount) {
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| 216 | wcount = write(to_fd, bufp, wresid);
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| 217 | wtotal += wcount;
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| 218 | if (info) {
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| 219 | info = 0;
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| 220 | (void)fprintf(stderr,
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| 221 | "%s -> %s %3d%%\n",
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| 222 | entp->fts_path, to.p_path,
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| 223 | cp_pct(wtotal, fs->st_size));
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| 224 |
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| 225 | }
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| 226 | if (wcount >= (ssize_t)wresid || wcount <= 0)
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| 227 | break;
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| 228 | }
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| 229 | if (wcount != (ssize_t)wresid) {
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| 230 | warn("%s", to.p_path);
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| 231 | rval = 1;
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| 232 | break;
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| 233 | }
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| 234 | }
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| 235 | if (rcount < 0) {
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| 236 | warn("%s", entp->fts_path);
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| 237 | rval = 1;
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| 238 | }
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| 239 | }
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| 240 |
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| 241 | /*
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| 242 | * Don't remove the target even after an error. The target might
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| 243 | * not be a regular file, or its attributes might be important,
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| 244 | * or its contents might be irreplaceable. It would only be safe
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| 245 | * to remove it if we created it and its length is 0.
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| 246 | */
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| 247 |
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| 248 | if (pflag && setfile(fs, to_fd))
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| 249 | rval = 1;
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| 250 | (void)close(from_fd);
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| 251 | if (close(to_fd)) {
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| 252 | warn("%s", to.p_path);
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| 253 | rval = 1;
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| 254 | }
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| 255 | return (rval);
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| 256 | }
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| 257 |
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| 258 | int
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| 259 | copy_link(const FTSENT *p, int exists)
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| 260 | {
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| 261 | int len;
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| 262 | char llink[PATH_MAX];
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| 263 |
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| 264 | if ((len = readlink(p->fts_path, llink, sizeof(llink) - 1)) == -1) {
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| 265 | warn("readlink: %s", p->fts_path);
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| 266 | return (1);
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| 267 | }
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| 268 | llink[len] = '\0';
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| 269 | if (exists && unlink(to.p_path)) {
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| 270 | warn("unlink: %s", to.p_path);
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| 271 | return (1);
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| 272 | }
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| 273 | if (symlink(llink, to.p_path)) {
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| 274 | warn("symlink: %s", llink);
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| 275 | return (1);
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| 276 | }
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| 277 | return (pflag ? setfile(p->fts_statp, -1) : 0);
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| 278 | }
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| 279 |
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| 280 | int
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| 281 | copy_fifo(struct stat *from_stat, int exists)
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| 282 | {
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| 283 | if (exists && unlink(to.p_path)) {
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| 284 | warn("unlink: %s", to.p_path);
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| 285 | return (1);
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| 286 | }
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| 287 | if (mkfifo(to.p_path, from_stat->st_mode)) {
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| 288 | warn("mkfifo: %s", to.p_path);
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| 289 | return (1);
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| 290 | }
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| 291 | return (pflag ? setfile(from_stat, -1) : 0);
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| 292 | }
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| 293 |
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| 294 | int
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| 295 | copy_special(struct stat *from_stat, int exists)
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| 296 | {
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| 297 | if (exists && unlink(to.p_path)) {
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| 298 | warn("unlink: %s", to.p_path);
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| 299 | return (1);
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| 300 | }
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| 301 | if (mknod(to.p_path, from_stat->st_mode, from_stat->st_rdev)) {
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| 302 | warn("mknod: %s", to.p_path);
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| 303 | return (1);
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| 304 | }
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| 305 | return (pflag ? setfile(from_stat, -1) : 0);
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| 306 | }
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| 307 |
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| 308 | int
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| 309 | setfile(struct stat *fs, int fd)
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| 310 | {
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| 311 | static struct timeval tv[2];
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| 312 | struct stat ts;
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| 313 | int rval, gotstat, islink, fdval;
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| 314 |
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| 315 | rval = 0;
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| 316 | fdval = fd != -1;
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| 317 | islink = !fdval && S_ISLNK(fs->st_mode);
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| 318 | fs->st_mode &= S_ISUID | S_ISGID | S_ISVTX |
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| 319 | S_IRWXU | S_IRWXG | S_IRWXO;
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| 320 |
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| 321 | #ifdef HAVE_ST_TIMESPEC
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| 322 | TIMESPEC_TO_TIMEVAL(&tv[0], &fs->st_atimespec);
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| 323 | TIMESPEC_TO_TIMEVAL(&tv[1], &fs->st_mtimespec);
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| 324 | #else
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| 325 | tv[0].tv_sec = fs->st_atime;
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| 326 | tv[1].tv_sec = fs->st_mtime;
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| 327 | tv[0].tv_usec = tv[1].tv_usec = 0;
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| 328 | #endif
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| 329 | if (islink ? lutimes(to.p_path, tv) : utimes(to.p_path, tv)) {
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| 330 | warn("%sutimes: %s", islink ? "l" : "", to.p_path);
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| 331 | rval = 1;
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| 332 | }
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| 333 | if (fdval ? fstat(fd, &ts) :
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| 334 | (islink ? lstat(to.p_path, &ts) : stat(to.p_path, &ts)))
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| 335 | gotstat = 0;
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| 336 | else {
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| 337 | gotstat = 1;
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| 338 | ts.st_mode &= S_ISUID | S_ISGID | S_ISVTX |
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| 339 | S_IRWXU | S_IRWXG | S_IRWXO;
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| 340 | }
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| 341 | /*
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| 342 | * Changing the ownership probably won't succeed, unless we're root
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| 343 | * or POSIX_CHOWN_RESTRICTED is not set. Set uid/gid before setting
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| 344 | * the mode; current BSD behavior is to remove all setuid bits on
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| 345 | * chown. If chown fails, lose setuid/setgid bits.
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| 346 | */
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| 347 | if (!gotstat || fs->st_uid != ts.st_uid || fs->st_gid != ts.st_gid)
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| 348 | if (fdval ? fchown(fd, fs->st_uid, fs->st_gid) :
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| 349 | (islink ? lchown(to.p_path, fs->st_uid, fs->st_gid) :
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| 350 | chown(to.p_path, fs->st_uid, fs->st_gid))) {
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| 351 | if (errno != EPERM) {
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| 352 | warn("chown: %s", to.p_path);
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| 353 | rval = 1;
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| 354 | }
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| 355 | fs->st_mode &= ~(S_ISUID | S_ISGID);
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| 356 | }
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| 357 |
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| 358 | if (!gotstat || fs->st_mode != ts.st_mode)
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| 359 | if (fdval ? fchmod(fd, fs->st_mode) :
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| 360 | (islink ? lchmod(to.p_path, fs->st_mode) :
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| 361 | chmod(to.p_path, fs->st_mode))) {
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| 362 | warn("chmod: %s", to.p_path);
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| 363 | rval = 1;
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| 364 | }
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| 365 |
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| 366 | #ifdef HAVE_ST_FLAGS
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| 367 | if (!gotstat || fs->st_flags != ts.st_flags)
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| 368 | if (fdval ?
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| 369 | fchflags(fd, fs->st_flags) :
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| 370 | (islink ? (errno = ENOSYS) :
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| 371 | chflags(to.p_path, fs->st_flags))) {
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| 372 | warn("chflags: %s", to.p_path);
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| 373 | rval = 1;
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| 374 | }
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| 375 | #endif
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| 376 |
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| 377 | return (rval);
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| 378 | }
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| 379 |
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