481 lines
12 KiB
C
481 lines
12 KiB
C
/* $OpenBSD: cp.c,v 1.53 2019/06/28 13:34:58 deraadt Exp $ */
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/* $NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $ */
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/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* David Hitz of Auspex Systems Inc.
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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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/*
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* Cp copies source files to target files.
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*
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* The global PATH_T structure "to" always contains the path to the
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* current target file. Since fts(3) does not change directories,
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* this path can be either absolute or dot-relative.
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*
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* The basic algorithm is to initialize "to" and use fts(3) to traverse
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* the file hierarchy rooted in the argument list. A trivial case is the
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* case of 'cp file1 file2'. The more interesting case is the case of
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* 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
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* path (relative to the root of the traversal) is appended to dir (stored
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* in "to") to form the final target path.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <sys/time.h>
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#include <dirent.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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#define fts_dne(_x) (_x->fts_pointer != NULL)
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PATH_T to = { to.p_path, "" };
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uid_t myuid;
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int Rflag, fflag, iflag, pflag, rflag, vflag;
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mode_t myumask;
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enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
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int copy(char *[], enum op, int);
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char *find_last_component(char *);
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int
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main(int argc, char *argv[])
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{
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struct stat to_stat, tmp_stat;
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enum op type;
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int Hflag, Lflag, Pflag, ch, fts_options, r;
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char *target;
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Hflag = Lflag = Pflag = Rflag = 0;
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while ((ch = getopt(argc, argv, "HLPRafiprv")) != -1)
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switch (ch) {
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case 'H':
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Hflag = 1;
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Lflag = Pflag = 0;
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break;
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case 'L':
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Lflag = 1;
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Hflag = Pflag = 0;
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break;
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case 'P':
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Pflag = 1;
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Hflag = Lflag = 0;
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break;
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case 'R':
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Rflag = 1;
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break;
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case 'a':
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Rflag = 1;
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pflag = 1;
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Pflag = 1;
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Hflag = Lflag = 0;
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break;
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case 'f':
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fflag = 1;
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iflag = 0;
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break;
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case 'i':
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iflag = 1;
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fflag = 0;
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break;
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case 'p':
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pflag = 1;
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break;
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case 'r':
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rflag = 1;
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break;
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case 'v':
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vflag = 1;
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break;
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default:
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usage();
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break;
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}
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argc -= optind;
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argv += optind;
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/*
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* Unfortunately, -R will use mkfifo & mknod;
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* -p will use fchown, fchmod, lchown, fchflags..
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*/
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if (Rflag == 0 && pflag == 0)
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if (pledge("stdio rpath wpath cpath fattr", NULL) == -1)
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err(1, "pledge");
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if (argc < 2)
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usage();
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fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
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if (rflag) {
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if (Rflag)
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errx(1,
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"the -R and -r options may not be specified together.");
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if (Hflag || Lflag || Pflag)
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errx(1,
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"the -H, -L, and -P options may not be specified with the -r option.");
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fts_options &= ~FTS_PHYSICAL;
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fts_options |= FTS_LOGICAL;
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}
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if (Rflag) {
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if (Hflag)
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fts_options |= FTS_COMFOLLOW;
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if (Lflag) {
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fts_options &= ~FTS_PHYSICAL;
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fts_options |= FTS_LOGICAL;
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}
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} else {
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fts_options &= ~FTS_PHYSICAL;
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fts_options |= FTS_LOGICAL;
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}
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myuid = getuid();
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/* Copy the umask for explicit mode setting. */
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myumask = umask(0);
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(void)umask(myumask);
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/* Save the target base in "to". */
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target = argv[--argc];
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if (strlcpy(to.p_path, target, sizeof to.p_path) >= sizeof(to.p_path))
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errx(1, "%s: name too long", target);
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to.p_end = to.p_path + strlen(to.p_path);
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if (to.p_path == to.p_end) {
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*to.p_end++ = '.';
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*to.p_end = '\0';
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}
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to.target_end = to.p_end;
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/* Set end of argument list for fts(3). */
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argv[argc] = NULL;
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/*
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* Cp has two distinct cases:
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*
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* cp [-R] source target
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* cp [-R] source1 ... sourceN directory
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*
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* In both cases, source can be either a file or a directory.
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*
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* In (1), the target becomes a copy of the source. That is, if the
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* source is a file, the target will be a file, and likewise for
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* directories.
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*
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* In (2), the real target is not directory, but "directory/source".
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*/
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r = stat(to.p_path, &to_stat);
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if (r == -1 && errno != ENOENT)
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err(1, "%s", to.p_path);
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if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
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/*
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* Case (1). Target is not a directory.
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*/
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if (argc > 1)
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usage();
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/*
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* Need to detect the case:
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* cp -R dir foo
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* Where dir is a directory and foo does not exist, where
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* we want pathname concatenations turned on but not for
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* the initial mkdir().
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*/
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if (r == -1) {
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if (rflag || (Rflag && (Lflag || Hflag)))
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stat(*argv, &tmp_stat);
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else
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lstat(*argv, &tmp_stat);
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if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
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type = DIR_TO_DNE;
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else
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type = FILE_TO_FILE;
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} else
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type = FILE_TO_FILE;
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} else {
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/*
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* Case (2). Target is a directory.
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*/
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type = FILE_TO_DIR;
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}
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return (copy(argv, type, fts_options));
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}
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char *
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find_last_component(char *path)
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{
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char *p;
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if ((p = strrchr(path, '/')) == NULL)
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p = path;
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else {
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/* Special case foo/ */
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if (!*(p+1)) {
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while ((p >= path) && *p == '/')
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p--;
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while ((p >= path) && *p != '/')
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p--;
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}
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p++;
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}
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return (p);
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}
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int
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copy(char *argv[], enum op type, int fts_options)
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{
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struct stat to_stat;
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FTS *ftsp;
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FTSENT *curr;
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int base, cval, nlen, rval;
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char *p, *target_mid;
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base = 0;
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if ((ftsp = fts_open(argv, fts_options, NULL)) == NULL)
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err(1, NULL);
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for (rval = 0; (curr = fts_read(ftsp)) != NULL;) {
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switch (curr->fts_info) {
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case FTS_NS:
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case FTS_DNR:
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case FTS_ERR:
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warnx("%s: %s",
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curr->fts_path, strerror(curr->fts_errno));
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rval = 1;
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continue;
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case FTS_DC:
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warnx("%s: directory causes a cycle", curr->fts_path);
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rval = 1;
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continue;
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}
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/*
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* If we are in case (2) or (3) above, we need to append the
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* source name to the target name.
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*/
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if (type != FILE_TO_FILE) {
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/*
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* Need to remember the roots of traversals to create
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* correct pathnames. If there's a directory being
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* copied to a non-existent directory, e.g.
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* cp -R a/dir noexist
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* the resulting path name should be noexist/foo, not
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* noexist/dir/foo (where foo is a file in dir), which
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* is the case where the target exists.
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*
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* Also, check for "..". This is for correct path
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* concatenation for paths ending in "..", e.g.
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* cp -R .. /tmp
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* Paths ending in ".." are changed to ".". This is
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* tricky, but seems the easiest way to fix the problem.
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*
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* XXX
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* Since the first level MUST be FTS_ROOTLEVEL, base
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* is always initialized.
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*/
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if (curr->fts_level == FTS_ROOTLEVEL) {
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if (type != DIR_TO_DNE) {
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p = find_last_component(curr->fts_path);
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base = p - curr->fts_path;
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if (!strcmp(&curr->fts_path[base],
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".."))
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base += 1;
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} else
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base = curr->fts_pathlen;
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}
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p = &curr->fts_path[base];
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nlen = curr->fts_pathlen - base;
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target_mid = to.target_end;
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if (*p != '/' && target_mid[-1] != '/')
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*target_mid++ = '/';
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*target_mid = '\0';
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if (target_mid - to.p_path + nlen >= PATH_MAX) {
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warnx("%s%s: name too long (not copied)",
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to.p_path, p);
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rval = 1;
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continue;
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}
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(void)strncat(target_mid, p, nlen);
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to.p_end = target_mid + nlen;
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*to.p_end = '\0';
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}
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/* Not an error but need to remember it happened */
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if (stat(to.p_path, &to_stat) == -1) {
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if (curr->fts_info == FTS_DP)
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continue;
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/*
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* We use fts_pointer as a boolean to indicate that
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* we created this directory ourselves. We'll use
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* this later on via the fts_dne macro to decide
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* whether or not to set the directory mode during
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* the post-order pass.
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*/
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curr->fts_pointer = (void *)1;
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} else {
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/*
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* Set directory mode/user/times on the post-order
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* pass. We can't do this earlier because the mode
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* may not allow us write permission. Furthermore,
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* if we set the times during the pre-order pass,
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* they will get changed later when the directory
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* is populated.
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*/
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if (curr->fts_info == FTS_DP) {
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if (!S_ISDIR(to_stat.st_mode))
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continue;
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/*
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* If not -p and directory didn't exist, set
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* it to be the same as the from directory,
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* unmodified by the umask; arguably wrong,
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* but it's been that way forever.
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*/
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if (pflag && setfile(curr->fts_statp, -1))
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rval = 1;
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else if (fts_dne(curr))
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(void)chmod(to.p_path,
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curr->fts_statp->st_mode);
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continue;
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}
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if (to_stat.st_dev == curr->fts_statp->st_dev &&
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to_stat.st_ino == curr->fts_statp->st_ino) {
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warnx("%s and %s are identical (not copied).",
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to.p_path, curr->fts_path);
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rval = 1;
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if (S_ISDIR(curr->fts_statp->st_mode))
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(void)fts_set(ftsp, curr, FTS_SKIP);
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continue;
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}
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if (!S_ISDIR(curr->fts_statp->st_mode) &&
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S_ISDIR(to_stat.st_mode)) {
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warnx("cannot overwrite directory %s with non-directory %s",
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to.p_path, curr->fts_path);
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rval = 1;
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continue;
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}
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}
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switch (curr->fts_statp->st_mode & S_IFMT) {
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case S_IFLNK:
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if ((cval = copy_link(curr, !fts_dne(curr))) == 1)
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rval = 1;
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if (!cval && vflag)
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(void)fprintf(stdout, "%s -> %s\n",
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curr->fts_path, to.p_path);
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break;
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case S_IFDIR:
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if (!Rflag && !rflag) {
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warnx("%s is a directory (not copied).",
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curr->fts_path);
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(void)fts_set(ftsp, curr, FTS_SKIP);
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rval = 1;
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break;
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}
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/*
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* If the directory doesn't exist, create the new
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* one with the from file mode plus owner RWX bits,
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* modified by the umask. Trade-off between being
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* able to write the directory (if from directory is
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* 555) and not causing a permissions race. If the
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* umask blocks owner writes, we fail..
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*/
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if (fts_dne(curr)) {
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if (mkdir(to.p_path,
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curr->fts_statp->st_mode | S_IRWXU) == -1)
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err(1, "%s", to.p_path);
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else if (vflag)
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(void)fprintf(stdout, "%s -> %s\n",
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curr->fts_path, to.p_path);
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} else if (!S_ISDIR(to_stat.st_mode))
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errc(1, ENOTDIR, "%s", to.p_path);
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break;
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case S_IFBLK:
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case S_IFCHR:
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if (Rflag) {
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if ((cval = copy_special(curr->fts_statp,
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!fts_dne(curr))) == 1)
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rval = 1;
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} else
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if ((cval = copy_file(curr, !fts_dne(curr))) == 1)
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rval = 1;
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if (!cval && vflag)
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(void)fprintf(stdout, "%s -> %s\n",
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curr->fts_path, to.p_path);
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cval = 0;
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break;
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case S_IFIFO:
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if (Rflag) {
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if ((cval = copy_fifo(curr->fts_statp,
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!fts_dne(curr))) == 1)
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rval = 1;
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} else
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if ((cval = copy_file(curr, !fts_dne(curr))) == 1)
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rval = 1;
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if (!cval && vflag)
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(void)fprintf(stdout, "%s -> %s\n",
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curr->fts_path, to.p_path);
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cval = 0;
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break;
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case S_IFSOCK:
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warnc(EOPNOTSUPP, "%s", curr->fts_path);
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break;
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default:
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if ((cval = copy_file(curr, !fts_dne(curr))) == 1)
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rval = 1;
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if (!cval && vflag)
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(void)fprintf(stdout, "%s -> %s\n",
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curr->fts_path, to.p_path);
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cval = 0;
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break;
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}
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}
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if (errno)
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err(1, "fts_read");
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(void)fts_close(ftsp);
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return (rval);
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}
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