/*
* Copyright 1991 - 1994, Julianne Frances Haugh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh 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 JULIE HAUGH 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 JULIE HAUGH 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.
*/
#include <config.h>
#ident "$Id$"
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/time.h>
#include <fcntl.h>
#include <stdio.h>
#include "prototypes.h"
#include "defines.h"
#ifdef WITH_SELINUX
#include <selinux/selinux.h>
static int selinux_enabled = -1;
#endif
static const char *src_orig;
static const char *dst_orig;
struct link_name {
dev_t ln_dev;
ino_t ln_ino;
int ln_count;
char *ln_name;
struct link_name *ln_next;
};
static struct link_name *links;
#ifdef WITH_SELINUX
static int selinux_file_context (const char *dst_name)
{
security_context_t scontext = NULL;
if (selinux_enabled < 0)
selinux_enabled = is_selinux_enabled () > 0;
if (selinux_enabled) {
if (matchpathcon (dst_name, 0, &scontext) < 0)
if (security_getenforce ())
return 1;
if (setfscreatecon (scontext) < 0)
if (security_getenforce ())
return 1;
freecon (scontext);
}
return 0;
}
#endif
/*
* remove_link - delete a link from the link list
*/
static void remove_link (struct link_name *ln)
{
struct link_name *lp;
if (links == ln) {
links = ln->ln_next;
free (ln->ln_name);
free (ln);
return;
}
for (lp = links; lp; lp = lp->ln_next)
if (lp->ln_next == ln)
break;
if (!lp)
return;
lp->ln_next = lp->ln_next->ln_next;
free (ln->ln_name);
free (ln);
}
/*
* check_link - see if a file is really a link
*/
static struct link_name *check_link (const char *name, const struct stat *sb)
{
struct link_name *lp;
int src_len;
int dst_len;
int name_len;
int len;
for (lp = links; lp; lp = lp->ln_next)
if (lp->ln_dev == sb->st_dev && lp->ln_ino == sb->st_ino)
return lp;
if (sb->st_nlink == 1)
return 0;
lp = (struct link_name *) xmalloc (sizeof *lp);
src_len = strlen (src_orig);
dst_len = strlen (dst_orig);
name_len = strlen (name);
lp->ln_dev = sb->st_dev;
lp->ln_ino = sb->st_ino;
lp->ln_count = sb->st_nlink;
len = name_len - src_len + dst_len + 1;
lp->ln_name = xmalloc (len);
snprintf (lp->ln_name, len, "%s%s", dst_orig, name + src_len);
lp->ln_next = links;
links = lp;
return 0;
}
/*
* copy_tree - copy files in a directory tree
*
* copy_tree() walks a directory tree and copies ordinary files
* as it goes.
*/
int copy_tree (const char *src_root, const char *dst_root, uid_t uid, gid_t gid)
{
char src_name[1024];
char dst_name[1024];
char buf[1024];
int ifd;
int ofd;
int err = 0;
int cnt;
int set_orig = 0;
struct DIRECT *ent;
struct stat sb;
struct link_name *lp;
struct timeval mt[2];
DIR *dir;
/*
* Make certain both directories exist. This routine is called
* after the home directory is created, or recursively after the
* target is created. It assumes the target directory exists.
*/
if (access (src_root, F_OK) != 0 || access (dst_root, F_OK) != 0)
return -1;
/*
* Open the source directory and read each entry. Every file
* entry in the directory is copied with the UID and GID set
* to the provided values. As an added security feature only
* regular files (and directories ...) are copied, and no file
* is made set-ID.
*/
if (!(dir = opendir (src_root)))
return -1;
if (src_orig == 0) {
src_orig = src_root;
dst_orig = dst_root;
set_orig++;
}
while ((ent = readdir (dir))) {
/*
* Skip the "." and ".." entries
*/
if (strcmp (ent->d_name, ".") == 0 ||
strcmp (ent->d_name, "..") == 0)
continue;
/*
* Make the filename for both the source and the
* destination files.
*/
if (strlen (src_root) + strlen (ent->d_name) + 2 >
sizeof src_name) {
err++;
break;
}
snprintf (src_name, sizeof src_name, "%s/%s", src_root,
ent->d_name);
if (strlen (dst_root) + strlen (ent->d_name) + 2 >
sizeof dst_name) {
err++;
break;
}
snprintf (dst_name, sizeof dst_name, "%s/%s", dst_root,
ent->d_name);
if (LSTAT (src_name, &sb) == -1)
continue;
#if defined(_BSD_SOURCE) || defined(_SVID_SOURCE)
mt[0].tv_sec = sb.st_atim.tv_sec;
mt[0].tv_usec = sb.st_atim.tv_nsec / 1000;
mt[1].tv_sec = sb.st_mtim.tv_sec;
mt[1].tv_usec = sb.st_mtim.tv_nsec / 1000;
#else
mt[0].tv_sec = sb.st_atime;
mt[0].tv_usec = sb.st_atimensec / 1000;
mt[1].tv_sec = sb.st_mtime;
mt[1].tv_usec = sb.st_mtimensec / 1000;
#endif
if (S_ISDIR (sb.st_mode)) {
/*
* Create a new target directory, make it owned by
* the user and then recursively copy that directory.
*/
#ifdef WITH_SELINUX
selinux_file_context (dst_name);
#endif
if (mkdir (dst_name, sb.st_mode)
|| chown (dst_name,
uid == (uid_t) - 1 ? sb.st_uid : uid,
gid == (gid_t) - 1 ? sb.st_gid : gid)
|| chmod (dst_name, sb.st_mode)
|| copy_tree (src_name, dst_name, uid, gid)
|| utimes (dst_name, mt)) {
err++;
break;
}
continue;
}
#ifdef S_IFLNK
/*
* Copy any symbolic links
*/
if (S_ISLNK (sb.st_mode)) {
char oldlink[1024];
char dummy[1024];
int len;
/*
* Get the name of the file which the link points
* to. If that name begins with the original
* source directory name, that part of the link
* name will be replaced with the original
* destinateion directory name.
*/
if ((len =
readlink (src_name, oldlink,
sizeof (oldlink) - 1)) < 0) {
err++;
break;
}
oldlink[len] = '\0'; /* readlink() does not NUL-terminate */
if (!strncmp (oldlink, src_orig, strlen (src_orig))) {
snprintf (dummy, sizeof dummy, "%s%s",
dst_orig,
oldlink + strlen (src_orig));
strcpy (oldlink, dummy);
}
#ifdef WITH_SELINUX
selinux_file_context (dst_name);
#endif
if (symlink (oldlink, dst_name)
|| lchown (dst_name,
uid == (uid_t) - 1 ? sb.st_uid : uid,
gid == (gid_t) - 1 ? sb.st_gid : gid)) {
err++;
break;
}
/* 2007-10-18: We don't care about
* exit status of lutimes because
* it returns ENOSYS on many system
* - not implemented
*/
lutimes (dst_name, mt);
continue;
}
#endif
/*
* See if this is a previously copied link
*/
if ((lp = check_link (src_name, &sb))) {
if (link (lp->ln_name, dst_name)) {
err++;
break;
}
if (unlink (src_name)) {
err++;
break;
}
if (--lp->ln_count <= 0)
remove_link (lp);
continue;
}
/*
* Deal with FIFOs and special files. The user really
* shouldn't have any of these, but it seems like it
* would be nice to copy everything ...
*/
if (!S_ISREG (sb.st_mode)) {
#ifdef WITH_SELINUX
selinux_file_context (dst_name);
#endif
if (mknod (dst_name, sb.st_mode & ~07777, sb.st_rdev)
|| chown (dst_name,
uid == (uid_t) - 1 ? sb.st_uid : uid,
gid == (gid_t) - 1 ? sb.st_gid : gid)
|| chmod (dst_name, sb.st_mode & 07777)
|| utimes (dst_name, mt)) {
err++;
break;
}
continue;
}
/*
* Create the new file and copy the contents. The new
* file will be owned by the provided UID and GID values.
*/
if ((ifd = open (src_name, O_RDONLY)) < 0) {
err++;
break;
}
#ifdef WITH_SELINUX
selinux_file_context (dst_name);
#endif
if ((ofd =
open (dst_name, O_WRONLY | O_CREAT | O_TRUNC, 0)) < 0
|| chown (dst_name,
uid == (uid_t) - 1 ? sb.st_uid : uid,
gid == (gid_t) - 1 ? sb.st_gid : gid)
|| chmod (dst_name, sb.st_mode & 07777)) {
close (ifd);
err++;
break;
}
while ((cnt = read (ifd, buf, sizeof buf)) > 0) {
if (write (ofd, buf, cnt) != cnt) {
cnt = -1;
break;
}
}
close (ifd);
if (futimes (ofd, mt) != 0) {
err++;
break;
}
if (close (ofd) != 0) {
err++;
break;
}
if (cnt == -1) {
err++;
break;
}
}
closedir (dir);
if (set_orig) {
src_orig = 0;
dst_orig = 0;
}
return err ? -1 : 0;
}
/*
* remove_tree - remove files in a directory tree
*
* remove_tree() walks a directory tree and deletes all the files
* and directories.
*/
int remove_tree (const char *root)
{
char new_name[1024];
int err = 0;
struct DIRECT *ent;
struct stat sb;
DIR *dir;
/*
* Make certain the directory exists.
*/
if (access (root, F_OK) != 0)
return -1;
/*
* Open the source directory and read each entry. Every file
* entry in the directory is copied with the UID and GID set
* to the provided values. As an added security feature only
* regular files (and directories ...) are copied, and no file
* is made set-ID.
*/
if (!(dir = opendir (root)))
return -1;
while ((ent = readdir (dir))) {
/*
* Skip the "." and ".." entries
*/
if (strcmp (ent->d_name, ".") == 0 ||
strcmp (ent->d_name, "..") == 0)
continue;
/*
* Make the filename for the current entry.
*/
if (strlen (root) + strlen (ent->d_name) + 2 > sizeof new_name) {
err++;
break;
}
snprintf (new_name, sizeof new_name, "%s/%s", root,
ent->d_name);
if (LSTAT (new_name, &sb) == -1)
continue;
if (S_ISDIR (sb.st_mode)) {
/*
* Recursively delete this directory.
*/
if (remove_tree (new_name)) {
err++;
break;
}
if (rmdir (new_name)) {
err++;
break;
}
continue;
}
unlink (new_name);
}
closedir (dir);
return err ? -1 : 0;
}