1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
|
/*
* Copyright (c) Björn Jacke 2010
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "system/filesys.h"
#include "transfer_file.h"
#define MODULE "crossrename"
static SMB_OFF_T module_sizelimit;
static int crossrename_connect(
struct vfs_handle_struct * handle,
const char * service,
const char * user)
{
int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
if (ret < 0) {
return ret;
}
module_sizelimit = (SMB_OFF_T) lp_parm_int(SNUM(handle->conn),
MODULE, "sizelimit", 20);
/* convert from MiB to byte: */
module_sizelimit *= 1048576;
return 0;
}
/*********************************************************
For rename across filesystems initial Patch from Warren Birnbaum
<warrenb@hpcvscdp.cv.hp.com>
**********************************************************/
static int copy_reg(const char *source, const char *dest)
{
SMB_STRUCT_STAT source_stats;
int saved_errno;
int ifd = -1;
int ofd = -1;
if (sys_lstat(source, &source_stats, false) == -1)
return -1;
if (!S_ISREG (source_stats.st_ex_mode))
return -1;
if (source_stats.st_ex_size > module_sizelimit) {
DEBUG(5,
("%s: size of %s larger than sizelimit (%lld > %lld), rename prohititted\n",
MODULE, source,
(long long)source_stats.st_ex_size,
(long long)module_sizelimit));
return -1;
}
if((ifd = sys_open (source, O_RDONLY, 0)) < 0)
return -1;
if (unlink (dest) && errno != ENOENT)
return -1;
#ifdef O_NOFOLLOW
if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600)) < 0 )
#else
if((ofd = sys_open (dest, O_WRONLY | O_CREAT | O_TRUNC , 0600)) < 0 )
#endif
goto err;
if (transfer_file(ifd, ofd, source_stats.st_ex_size) == -1)
goto err;
/*
* Try to preserve ownership. For non-root it might fail, but that's ok.
* But root probably wants to know, e.g. if NFS disallows it.
*/
#ifdef HAVE_FCHOWN
if ((fchown(ofd, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
#else
if ((chown(dest, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
#endif
goto err;
/*
* fchown turns off set[ug]id bits for non-root,
* so do the chmod last.
*/
#if defined(HAVE_FCHMOD)
if (fchmod (ofd, source_stats.st_ex_mode & 07777))
#else
if (chmod (dest, source_stats.st_ex_mode & 07777))
#endif
goto err;
if (close (ifd) == -1)
goto err;
if (close (ofd) == -1)
return -1;
/* Try to copy the old file's modtime and access time. */
#if defined(HAVE_UTIMENSAT)
{
struct timespec ts[2];
ts[0] = source_stats.st_ex_atime;
ts[1] = source_stats.st_ex_mtime;
utimensat(AT_FDCWD, dest, ts, AT_SYMLINK_NOFOLLOW);
}
#elif defined(HAVE_UTIMES)
{
struct timeval tv[2];
tv[0] = convert_timespec_to_timeval(source_stats.st_ex_atime);
tv[1] = convert_timespec_to_timeval(source_stats.st_ex_mtime);
#ifdef HAVE_LUTIMES
lutimes(dest, tv);
#else
utimes(dest, tv);
#endif
}
#elif defined(HAVE_UTIME)
{
struct utimbuf tv;
tv.actime = convert_timespec_to_time_t(source_stats.st_ex_atime);
tv.modtime = convert_timespec_to_time_t(source_stats.st_ex_mtime);
utime(dest, &tv);
}
#endif
if (unlink (source) == -1)
return -1;
return 0;
err:
saved_errno = errno;
if (ifd != -1)
close(ifd);
if (ofd != -1)
close(ofd);
errno = saved_errno;
return -1;
}
static int crossrename_rename(vfs_handle_struct *handle,
const struct smb_filename *smb_fname_src,
const struct smb_filename *smb_fname_dst)
{
int result = -1;
START_PROFILE(syscall_rename);
if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
errno = ENOENT;
goto out;
}
result = rename(smb_fname_src->base_name, smb_fname_dst->base_name);
if ((result == -1) && (errno == EXDEV)) {
/* Rename across filesystems needed. */
result = copy_reg(smb_fname_src->base_name,
smb_fname_dst->base_name);
}
out:
END_PROFILE(syscall_rename);
return result;
}
static struct vfs_fn_pointers vfs_crossrename_fns = {
.connect_fn = crossrename_connect,
.rename = crossrename_rename
};
NTSTATUS vfs_crossrename_init(void);
NTSTATUS vfs_crossrename_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
&vfs_crossrename_fns);
}
|
