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4003736a3d
Signed-off-by: Christof Schmitt <cs@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Autobuild-User(master): Andrew Bartlett <abartlet@samba.org> Autobuild-Date(master): Mon Dec 18 13:32:00 CET 2017 on sn-devel-144
208 lines
4.9 KiB
C
208 lines
4.9 KiB
C
/*
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* Copyright (c) Björn Jacke 2010
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smbd/smbd.h"
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#include "system/filesys.h"
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#include "transfer_file.h"
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#include "smbprofile.h"
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#define MODULE "crossrename"
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static off_t module_sizelimit;
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static int crossrename_connect(
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struct vfs_handle_struct * handle,
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const char * service,
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const char * user)
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{
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int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
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if (ret < 0) {
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return ret;
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}
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module_sizelimit = (off_t) lp_parm_int(SNUM(handle->conn),
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MODULE, "sizelimit", 20);
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/* convert from MiB to byte: */
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module_sizelimit *= 1048576;
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return 0;
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}
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/*********************************************************
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For rename across filesystems initial Patch from Warren Birnbaum
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<warrenb@hpcvscdp.cv.hp.com>
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**********************************************************/
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static int copy_reg(const char *source, const char *dest)
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{
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SMB_STRUCT_STAT source_stats;
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int saved_errno;
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int ifd = -1;
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int ofd = -1;
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if (sys_lstat(source, &source_stats, false) == -1)
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return -1;
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if (!S_ISREG (source_stats.st_ex_mode))
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return -1;
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if (source_stats.st_ex_size > module_sizelimit) {
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DEBUG(5,
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("%s: size of %s larger than sizelimit (%lld > %lld), rename prohititted\n",
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MODULE, source,
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(long long)source_stats.st_ex_size,
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(long long)module_sizelimit));
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return -1;
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}
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if((ifd = open (source, O_RDONLY, 0)) < 0)
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return -1;
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if (unlink (dest) && errno != ENOENT) {
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close(ifd);
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return -1;
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}
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#ifdef O_NOFOLLOW
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if((ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600)) < 0 )
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#else
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if((ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC , 0600)) < 0 )
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#endif
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goto err;
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if (transfer_file(ifd, ofd, source_stats.st_ex_size) == -1)
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goto err;
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/*
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* Try to preserve ownership. For non-root it might fail, but that's ok.
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* But root probably wants to know, e.g. if NFS disallows it.
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*/
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#ifdef HAVE_FCHOWN
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if ((fchown(ofd, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
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#else
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if ((chown(dest, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
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#endif
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goto err;
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/*
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* fchown turns off set[ug]id bits for non-root,
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* so do the chmod last.
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*/
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#if defined(HAVE_FCHMOD)
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if ((fchmod (ofd, source_stats.st_ex_mode & 07777) == -1) &&
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(errno != EPERM))
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#else
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if ((chmod (dest, source_stats.st_ex_mode & 07777) == -1) &&
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(errno != EPERM))
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#endif
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goto err;
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if (close (ifd) == -1)
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goto err;
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if (close (ofd) == -1)
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return -1;
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/* Try to copy the old file's modtime and access time. */
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#if defined(HAVE_UTIMENSAT)
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{
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struct timespec ts[2];
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ts[0] = source_stats.st_ex_atime;
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ts[1] = source_stats.st_ex_mtime;
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utimensat(AT_FDCWD, dest, ts, AT_SYMLINK_NOFOLLOW);
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}
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#elif defined(HAVE_UTIMES)
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{
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struct timeval tv[2];
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tv[0] = convert_timespec_to_timeval(source_stats.st_ex_atime);
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tv[1] = convert_timespec_to_timeval(source_stats.st_ex_mtime);
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#ifdef HAVE_LUTIMES
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lutimes(dest, tv);
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#else
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utimes(dest, tv);
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#endif
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}
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#elif defined(HAVE_UTIME)
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{
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struct utimbuf tv;
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tv.actime = convert_timespec_to_time_t(source_stats.st_ex_atime);
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tv.modtime = convert_timespec_to_time_t(source_stats.st_ex_mtime);
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utime(dest, &tv);
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}
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#endif
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if (unlink (source) == -1)
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return -1;
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return 0;
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err:
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saved_errno = errno;
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if (ifd != -1)
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close(ifd);
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if (ofd != -1)
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close(ofd);
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errno = saved_errno;
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return -1;
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}
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static int crossrename_rename(vfs_handle_struct *handle,
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const struct smb_filename *smb_fname_src,
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const struct smb_filename *smb_fname_dst)
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{
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int result = -1;
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START_PROFILE(syscall_rename);
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if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
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errno = ENOENT;
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goto out;
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}
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result = rename(smb_fname_src->base_name, smb_fname_dst->base_name);
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if ((result == -1) && (errno == EXDEV)) {
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/* Rename across filesystems needed. */
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result = copy_reg(smb_fname_src->base_name,
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smb_fname_dst->base_name);
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}
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out:
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END_PROFILE(syscall_rename);
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return result;
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}
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static struct vfs_fn_pointers vfs_crossrename_fns = {
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.connect_fn = crossrename_connect,
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.rename_fn = crossrename_rename
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};
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static_decl_vfs;
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NTSTATUS vfs_crossrename_init(TALLOC_CTX *ctx)
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{
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return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
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&vfs_crossrename_fns);
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}
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