Line data Source code
1 : /*
2 : * Copyright (c) Björn Jacke 2010
3 : *
4 : * This program is free software; you can redistribute it and/or modify
5 : * it under the terms of the GNU General Public License as published by
6 : * the Free Software Foundation; either version 3 of the License, or
7 : * (at your option) any later version.
8 : *
9 : * This program is distributed in the hope that it will be useful,
10 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 : * GNU General Public License for more details.
13 : *
14 : * You should have received a copy of the GNU General Public License
15 : * along with this program; if not, see <http://www.gnu.org/licenses/>.
16 : */
17 :
18 : #include "includes.h"
19 : #include "smbd/smbd.h"
20 : #include "system/filesys.h"
21 : #include "transfer_file.h"
22 : #include "smbprofile.h"
23 :
24 : #define MODULE "crossrename"
25 : static off_t module_sizelimit;
26 :
27 0 : static int crossrename_connect(
28 : struct vfs_handle_struct * handle,
29 : const char * service,
30 : const char * user)
31 : {
32 0 : int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
33 :
34 0 : if (ret < 0) {
35 0 : return ret;
36 : }
37 :
38 0 : module_sizelimit = (off_t) lp_parm_int(SNUM(handle->conn),
39 : MODULE, "sizelimit", 20);
40 : /* convert from MiB to byte: */
41 0 : module_sizelimit *= 1048576;
42 :
43 0 : return 0;
44 : }
45 :
46 : /*********************************************************
47 : For rename across filesystems initial Patch from Warren Birnbaum
48 : <warrenb@hpcvscdp.cv.hp.com>
49 : **********************************************************/
50 :
51 0 : static NTSTATUS copy_reg(vfs_handle_struct *handle,
52 : struct files_struct *srcfsp,
53 : const struct smb_filename *source,
54 : struct files_struct *dstfsp,
55 : const struct smb_filename *dest)
56 : {
57 : NTSTATUS status;
58 0 : struct smb_filename *full_fname_src = NULL;
59 0 : struct smb_filename *full_fname_dst = NULL;
60 : int ret;
61 :
62 0 : if (!VALID_STAT(source->st)) {
63 0 : status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
64 0 : goto out;
65 : }
66 0 : if (!S_ISREG(source->st.st_ex_mode)) {
67 0 : status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
68 0 : goto out;
69 : }
70 :
71 0 : if (source->st.st_ex_size > module_sizelimit) {
72 0 : DBG_INFO("%s: size of %s larger than sizelimit (%lld > %lld), "
73 : "rename prohibited\n",
74 : MODULE,
75 : source->base_name,
76 : (long long)source->st.st_ex_size,
77 : (long long)module_sizelimit);
78 0 : status = NT_STATUS_INVALID_PARAMETER;
79 0 : goto out;
80 : }
81 :
82 0 : full_fname_src = full_path_from_dirfsp_atname(talloc_tos(),
83 : srcfsp,
84 : source);
85 0 : if (full_fname_src == NULL) {
86 0 : status = NT_STATUS_NO_MEMORY;
87 0 : goto out;
88 : }
89 0 : full_fname_dst = full_path_from_dirfsp_atname(talloc_tos(),
90 : dstfsp,
91 : dest);
92 0 : if (full_fname_dst == NULL) {
93 0 : status = NT_STATUS_NO_MEMORY;
94 0 : goto out;
95 : }
96 :
97 0 : ret = SMB_VFS_NEXT_UNLINKAT(handle,
98 : dstfsp,
99 : dest,
100 : 0);
101 0 : if (ret == -1) {
102 0 : status = map_nt_error_from_unix(errno);
103 0 : goto out;
104 : }
105 :
106 : /*
107 : * copy_internals() takes attribute values from the NTrename call.
108 : *
109 : * From MS-CIFS:
110 : *
111 : * "If the attribute is 0x0000, then only normal files are renamed.
112 : * If the system file or hidden attributes are specified, then the
113 : * rename is inclusive of both special types."
114 : */
115 0 : status = copy_internals(talloc_tos(),
116 0 : handle->conn,
117 : NULL,
118 : srcfsp, /* src_dirfsp */
119 : full_fname_src,
120 : dstfsp, /* dst_dirfsp */
121 : full_fname_dst,
122 : FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
123 0 : if (!NT_STATUS_IS_OK(status)) {
124 0 : goto out;
125 : }
126 :
127 0 : ret = SMB_VFS_NEXT_UNLINKAT(handle,
128 : srcfsp,
129 : source,
130 : 0);
131 0 : if (ret == -1) {
132 0 : status = map_nt_error_from_unix(errno);
133 0 : goto out;
134 : }
135 :
136 0 : out:
137 :
138 0 : TALLOC_FREE(full_fname_src);
139 0 : TALLOC_FREE(full_fname_dst);
140 0 : return status;
141 : }
142 :
143 0 : static int crossrename_renameat(vfs_handle_struct *handle,
144 : files_struct *srcfsp,
145 : const struct smb_filename *smb_fname_src,
146 : files_struct *dstfsp,
147 : const struct smb_filename *smb_fname_dst)
148 : {
149 0 : int result = -1;
150 :
151 0 : START_PROFILE(syscall_renameat);
152 :
153 0 : if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
154 0 : errno = ENOENT;
155 0 : goto out;
156 : }
157 :
158 0 : result = SMB_VFS_NEXT_RENAMEAT(handle,
159 : srcfsp,
160 : smb_fname_src,
161 : dstfsp,
162 : smb_fname_dst);
163 :
164 0 : if ((result == -1) && (errno == EXDEV)) {
165 : /* Rename across filesystems needed. */
166 0 : NTSTATUS status = copy_reg(handle,
167 : srcfsp,
168 : smb_fname_src,
169 : dstfsp,
170 : smb_fname_dst);
171 0 : if (!NT_STATUS_IS_OK(status)) {
172 0 : errno = map_errno_from_nt_status(status);
173 0 : result = -1;
174 : }
175 : }
176 :
177 0 : out:
178 0 : END_PROFILE(syscall_renameat);
179 0 : return result;
180 : }
181 :
182 :
183 : static struct vfs_fn_pointers vfs_crossrename_fns = {
184 : .connect_fn = crossrename_connect,
185 : .renameat_fn = crossrename_renameat
186 : };
187 :
188 : static_decl_vfs;
189 26 : NTSTATUS vfs_crossrename_init(TALLOC_CTX *ctx)
190 : {
191 26 : return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
192 : &vfs_crossrename_fns);
193 : }
194 :
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