OpenBSD-4.6/bin/cp/cp.c
/* $OpenBSD: cp.c,v 1.34 2007/11/04 02:01:57 tedu Exp $ */
/* $NetBSD: cp.c,v 1.14 1995/09/07 06:14:51 jtc Exp $ */
/*
* Copyright (c) 1988, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* David Hitz of Auspex Systems Inc.
*
* 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.
*/
/*
* Cp copies source files to target files.
*
* The global PATH_T structure "to" always contains the path to the
* current target file. Since fts(3) does not change directories,
* this path can be either absolute or dot-relative.
*
* The basic algorithm is to initialize "to" and use fts(3) to traverse
* the file hierarchy rooted in the argument list. A trivial case is the
* case of 'cp file1 file2'. The more interesting case is the case of
* 'cp file1 file2 ... fileN dir' where the hierarchy is traversed and the
* path (relative to the root of the traversal) is appended to dir (stored
* in "to") to form the final target path.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/time.h>
#include <dirent.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <locale.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "extern.h"
#define fts_dne(_x) (_x->fts_pointer != NULL)
PATH_T to = { to.p_path, "" };
uid_t myuid;
int Rflag, fflag, iflag, pflag, rflag;
mode_t myumask;
enum op { FILE_TO_FILE, FILE_TO_DIR, DIR_TO_DNE };
int copy(char *[], enum op, int);
int mastercmp(const FTSENT **, const FTSENT **);
char *find_last_component(char *);
int
main(int argc, char *argv[])
{
struct stat to_stat, tmp_stat;
enum op type;
int Hflag, Lflag, Pflag, ch, fts_options, r;
char *target;
(void)setlocale(LC_ALL, "");
Hflag = Lflag = Pflag = Rflag = 0;
while ((ch = getopt(argc, argv, "HLPRfipr")) != -1)
switch (ch) {
case 'H':
Hflag = 1;
Lflag = Pflag = 0;
break;
case 'L':
Lflag = 1;
Hflag = Pflag = 0;
break;
case 'P':
Pflag = 1;
Hflag = Lflag = 0;
break;
case 'R':
Rflag = 1;
break;
case 'f':
fflag = 1;
iflag = 0;
break;
case 'i':
iflag = isatty(STDIN_FILENO);
fflag = 0;
break;
case 'p':
pflag = 1;
break;
case 'r':
rflag = 1;
break;
default:
usage();
break;
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
fts_options = FTS_NOCHDIR | FTS_PHYSICAL;
if (rflag) {
if (Rflag)
errx(1,
"the -R and -r options may not be specified together.");
if (Hflag || Lflag || Pflag)
errx(1,
"the -H, -L, and -P options may not be specified with the -r option.");
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
}
if (Rflag) {
if (Hflag)
fts_options |= FTS_COMFOLLOW;
if (Lflag) {
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
}
} else {
fts_options &= ~FTS_PHYSICAL;
fts_options |= FTS_LOGICAL;
}
myuid = getuid();
/* Copy the umask for explicit mode setting. */
myumask = umask(0);
(void)umask(myumask);
/* Save the target base in "to". */
target = argv[--argc];
if (strlcpy(to.p_path, target, sizeof to.p_path) >= sizeof(to.p_path))
errx(1, "%s: name too long", target);
to.p_end = to.p_path + strlen(to.p_path);
if (to.p_path == to.p_end) {
*to.p_end++ = '.';
*to.p_end = '\0';
}
to.target_end = to.p_end;
/* Set end of argument list for fts(3). */
argv[argc] = NULL;
/*
* Cp has two distinct cases:
*
* cp [-R] source target
* cp [-R] source1 ... sourceN directory
*
* In both cases, source can be either a file or a directory.
*
* In (1), the target becomes a copy of the source. That is, if the
* source is a file, the target will be a file, and likewise for
* directories.
*
* In (2), the real target is not directory, but "directory/source".
*/
r = stat(to.p_path, &to_stat);
if (r == -1 && errno != ENOENT)
err(1, "%s", to.p_path);
if (r == -1 || !S_ISDIR(to_stat.st_mode)) {
/*
* Case (1). Target is not a directory.
*/
if (argc > 1)
usage();
/*
* Need to detect the case:
* cp -R dir foo
* Where dir is a directory and foo does not exist, where
* we want pathname concatenations turned on but not for
* the initial mkdir().
*/
if (r == -1) {
if (rflag || (Rflag && (Lflag || Hflag)))
stat(*argv, &tmp_stat);
else
lstat(*argv, &tmp_stat);
if (S_ISDIR(tmp_stat.st_mode) && (Rflag || rflag))
type = DIR_TO_DNE;
else
type = FILE_TO_FILE;
} else
type = FILE_TO_FILE;
} else {
/*
* Case (2). Target is a directory.
*/
type = FILE_TO_DIR;
}
exit(copy(argv, type, fts_options));
}
char *
find_last_component(char *path)
{
char *p;
if ((p = strrchr(path, '/')) == NULL)
p = path;
else {
/* Special case foo/ */
if (!*(p+1)) {
while ((p >= path) && *p == '/')
p--;
while ((p >= path) && *p != '/')
p--;
}
p++;
}
return (p);
}
int
copy(char *argv[], enum op type, int fts_options)
{
struct stat to_stat;
FTS *ftsp;
FTSENT *curr;
int base, nlen, rval;
char *p, *target_mid;
base = 0;
if ((ftsp = fts_open(argv, fts_options, mastercmp)) == NULL)
err(1, NULL);
for (rval = 0; (curr = fts_read(ftsp)) != NULL;) {
switch (curr->fts_info) {
case FTS_NS:
case FTS_DNR:
case FTS_ERR:
warnx("%s: %s",
curr->fts_path, strerror(curr->fts_errno));
rval = 1;
continue;
case FTS_DC:
warnx("%s: directory causes a cycle", curr->fts_path);
rval = 1;
continue;
}
/*
* If we are in case (2) or (3) above, we need to append the
* source name to the target name.
*/
if (type != FILE_TO_FILE) {
/*
* Need to remember the roots of traversals to create
* correct pathnames. If there's a directory being
* copied to a non-existent directory, e.g.
* cp -R a/dir noexist
* the resulting path name should be noexist/foo, not
* noexist/dir/foo (where foo is a file in dir), which
* is the case where the target exists.
*
* Also, check for "..". This is for correct path
* concatenation for paths ending in "..", e.g.
* cp -R .. /tmp
* Paths ending in ".." are changed to ".". This is
* tricky, but seems the easiest way to fix the problem.
*
* XXX
* Since the first level MUST be FTS_ROOTLEVEL, base
* is always initialized.
*/
if (curr->fts_level == FTS_ROOTLEVEL) {
if (type != DIR_TO_DNE) {
p = find_last_component(curr->fts_path);
base = p - curr->fts_path;
if (!strcmp(&curr->fts_path[base],
".."))
base += 1;
} else
base = curr->fts_pathlen;
}
p = &curr->fts_path[base];
nlen = curr->fts_pathlen - base;
target_mid = to.target_end;
if (*p != '/' && target_mid[-1] != '/')
*target_mid++ = '/';
*target_mid = '\0';
if (target_mid - to.p_path + nlen >= MAXPATHLEN) {
warnx("%s%s: name too long (not copied)",
to.p_path, p);
rval = 1;
continue;
}
(void)strncat(target_mid, p, nlen);
to.p_end = target_mid + nlen;
*to.p_end = '\0';
}
/* Not an error but need to remember it happened */
if (stat(to.p_path, &to_stat) == -1) {
if (curr->fts_info == FTS_DP)
continue;
/*
* We use fts_pointer as a boolean to indicate that
* we created this directory ourselves. We'll use
* this later on via the fts_dne macro to decide
* whether or not to set the directory mode during
* the post-order pass.
*/
curr->fts_pointer = (void *)1;
} else {
/*
* Set directory mode/user/times on the post-order
* pass. We can't do this earlier because the mode
* may not allow us write permission. Furthermore,
* if we set the times during the pre-order pass,
* they will get changed later when the directory
* is populated.
*/
if (curr->fts_info == FTS_DP) {
if (!S_ISDIR(to_stat.st_mode))
continue;
/*
* If not -p and directory didn't exist, set
* it to be the same as the from directory,
* unmodified by the umask; arguably wrong,
* but it's been that way forever.
*/
if (pflag && setfile(curr->fts_statp, 0))
rval = 1;
else if (fts_dne(curr))
(void)chmod(to.p_path,
curr->fts_statp->st_mode);
continue;
}
if (to_stat.st_dev == curr->fts_statp->st_dev &&
to_stat.st_ino == curr->fts_statp->st_ino) {
warnx("%s and %s are identical (not copied).",
to.p_path, curr->fts_path);
rval = 1;
if (S_ISDIR(curr->fts_statp->st_mode))
(void)fts_set(ftsp, curr, FTS_SKIP);
continue;
}
if (!S_ISDIR(curr->fts_statp->st_mode) &&
S_ISDIR(to_stat.st_mode)) {
warnx("cannot overwrite directory %s with non-directory %s",
to.p_path, curr->fts_path);
rval = 1;
continue;
}
}
switch (curr->fts_statp->st_mode & S_IFMT) {
case S_IFLNK:
if (copy_link(curr, !fts_dne(curr)))
rval = 1;
break;
case S_IFDIR:
if (!Rflag && !rflag) {
warnx("%s is a directory (not copied).",
curr->fts_path);
(void)fts_set(ftsp, curr, FTS_SKIP);
rval = 1;
break;
}
/*
* If the directory doesn't exist, create the new
* one with the from file mode plus owner RWX bits,
* modified by the umask. Trade-off between being
* able to write the directory (if from directory is
* 555) and not causing a permissions race. If the
* umask blocks owner writes, we fail..
*/
if (fts_dne(curr)) {
if (mkdir(to.p_path,
curr->fts_statp->st_mode | S_IRWXU) < 0)
err(1, "%s", to.p_path);
} else if (!S_ISDIR(to_stat.st_mode)) {
errno = ENOTDIR;
err(1, "%s", to.p_path);
}
break;
case S_IFBLK:
case S_IFCHR:
if (Rflag) {
if (copy_special(curr->fts_statp, !fts_dne(curr)))
rval = 1;
} else
if (copy_file(curr, fts_dne(curr)))
rval = 1;
break;
case S_IFIFO:
if (Rflag) {
if (copy_fifo(curr->fts_statp, !fts_dne(curr)))
rval = 1;
} else
if (copy_file(curr, fts_dne(curr)))
rval = 1;
break;
case S_IFSOCK:
warnx("%s: %s", curr->fts_path, strerror(EOPNOTSUPP));
break;
default:
if (copy_file(curr, fts_dne(curr)))
rval = 1;
break;
}
}
if (errno)
err(1, "fts_read");
(void)fts_close(ftsp);
return (rval);
}
/*
* mastercmp --
* The comparison function for the copy order. The order is to copy
* non-directory files before directory files. The reason for this
* is because files tend to be in the same cylinder group as their
* parent directory, whereas directories tend not to be. Copying the
* files first reduces seeking.
*/
int
mastercmp(const FTSENT **a, const FTSENT **b)
{
int a_info, b_info;
a_info = (*a)->fts_info;
if (a_info == FTS_ERR || a_info == FTS_NS || a_info == FTS_DNR)
return (0);
b_info = (*b)->fts_info;
if (b_info == FTS_ERR || b_info == FTS_NS || b_info == FTS_DNR)
return (0);
if (a_info == FTS_D)
return (-1);
if (b_info == FTS_D)
return (1);
return (0);
}