source: vendor/current/source3/libsmb/reparse_symlink.c

Last change on this file was 988, checked in by Silvan Scherrer, 9 years ago

Samba Server: update vendor to version 4.4.3
File size: 5.1 KB
Line 
1/*
2 * Unix SMB/CIFS implementation.
3 *
4 * Implementation of
5 * http://msdn.microsoft.com/en-us/library/cc232006%28v=PROT.13%29.aspx
6 *
7 * Copyright (C) Volker Lendecke 2011
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 3 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program. If not, see <http://www.gnu.org/licenses/>.
21 */
22
23#include "includes.h"
24#include "include/client.h"
25#include "libsmb/proto.h"
26#include "include/ntioctl.h"
27
28bool symlink_reparse_buffer_marshall(
29 const char *substitute, const char *printname, uint32_t flags,
30 TALLOC_CTX *mem_ctx, uint8_t **pdst, size_t *pdstlen)
31{
32 uint8_t *dst = NULL;
33 size_t dst_len;
34 uint8_t *subst_utf16 = NULL;
35 uint8_t *print_utf16 = NULL;
36 size_t subst_len = 0;
37 size_t print_len = 0;
38
39 if (substitute == NULL) {
40 return false;
41 }
42 if (printname == NULL) {
43 printname = substitute;
44 }
45
46 if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_UTF16,
47 substitute, strlen(substitute),
48 &subst_utf16, &subst_len)) {
49 goto fail;
50 }
51 if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_UTF16,
52 printname, strlen(printname),
53 &print_utf16, &print_len)) {
54 goto fail;
55 }
56 dst_len = 20 + subst_len + print_len;
57 dst = talloc_array(mem_ctx, uint8_t, dst_len);
58 if (dst == NULL) {
59 goto fail;
60 }
61
62 SIVAL(dst, 0, IO_REPARSE_TAG_SYMLINK); /* ReparseTag */
63 SSVAL(dst, 4, 12 + subst_len + print_len); /* ReparseDataLength */
64 SSVAL(dst, 6, 0); /* Reserved */
65 SSVAL(dst, 8, 0); /* SubstituteNameOffset */
66 SSVAL(dst, 10, subst_len); /* SubstituteNameLength */
67 SSVAL(dst, 12, subst_len); /* PrintNameOffset */
68 SSVAL(dst, 14, print_len); /* PrintNameLength */
69 SIVAL(dst, 16, flags); /* Flags */
70
71 if ((subst_utf16 != NULL) && (subst_len != 0)) {
72 memcpy(dst + 20, subst_utf16, subst_len);
73 TALLOC_FREE(subst_utf16);
74 }
75
76 if ((print_utf16 != NULL) && (print_len != 0)) {
77 memcpy(dst + 20 + subst_len, print_utf16, print_len);
78 TALLOC_FREE(print_utf16);
79 }
80
81 *pdst = dst;
82 *pdstlen = dst_len;
83 return true;
84fail:
85 TALLOC_FREE(subst_utf16);
86 TALLOC_FREE(print_utf16);
87 return false;
88}
89
90bool symlink_reparse_buffer_parse(
91 const uint8_t *src, size_t srclen, TALLOC_CTX *mem_ctx,
92 char **psubstitute_name, char **pprint_name, uint32_t *pflags)
93{
94 uint16_t reparse_data_length;
95 uint16_t substitute_name_offset, substitute_name_length;
96 uint16_t print_name_offset, print_name_length;
97 uint32_t flags;
98 char *substitute_name = NULL;
99 char *print_name = NULL;
100
101 if (srclen < 20) {
102 DEBUG(10, ("srclen = %d, expected >= 20\n", (int)srclen));
103 return false;
104 }
105 if (IVAL(src, 0) != IO_REPARSE_TAG_SYMLINK) {
106 DEBUG(10, ("Got ReparseTag %8.8x, expected %8.8x\n",
107 IVAL(src, 0), IO_REPARSE_TAG_SYMLINK));
108 return false;
109 }
110
111 reparse_data_length = SVAL(src, 4);
112 substitute_name_offset = SVAL(src, 8);
113 substitute_name_length = SVAL(src, 10);
114 print_name_offset = SVAL(src, 12);
115 print_name_length = SVAL(src, 14);
116 flags = IVAL(src, 16);
117
118 if (reparse_data_length < 12) {
119 DEBUG(10, ("reparse_data_length = %d, expected >= 12\n",
120 (int)reparse_data_length));
121 return false;
122 }
123 if (trans_oob(srclen - 8, reparse_data_length, 0)) {
124 DEBUG(10, ("reparse_data_length (%d) too large for "
125 "src_len (%d)\n", (int)reparse_data_length,
126 (int)srclen));
127 return false;
128 }
129 if (trans_oob(reparse_data_length - 12, substitute_name_offset,
130 substitute_name_length)) {
131 DEBUG(10, ("substitute_name (%d/%d) does not fit in "
132 "reparse_data_length (%d)\n",
133 (int)substitute_name_offset,
134 (int)substitute_name_length,
135 (int)reparse_data_length - 12));
136 return false;
137 }
138 if (trans_oob(reparse_data_length - 12, print_name_offset,
139 print_name_length)) {
140 DEBUG(10, ("print_name (%d/%d) does not fit in "
141 "reparse_data_length (%d)\n",
142 (int)print_name_offset,
143 (int)print_name_length,
144 (int)reparse_data_length - 12));
145 return false;
146 }
147
148 if ((psubstitute_name != NULL) &&
149 !convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX,
150 src + 20 + substitute_name_offset,
151 substitute_name_length,
152 &substitute_name, NULL)) {
153 DEBUG(10, ("convert_string_talloc for substitute_name "
154 "failed\n"));
155 return false;
156 }
157 if ((pprint_name != NULL) &&
158 !convert_string_talloc(mem_ctx, CH_UTF16, CH_UNIX,
159 src + 20 + print_name_offset,
160 print_name_length,
161 &print_name, NULL)) {
162 DEBUG(10, ("convert_string_talloc for print_name "
163 "failed\n"));
164 TALLOC_FREE(substitute_name);
165 return false;
166 }
167 if (psubstitute_name != NULL) {
168 *psubstitute_name = substitute_name;
169 }
170 if (pprint_name != NULL) {
171 *pprint_name = print_name;
172 }
173 if (pflags != NULL) {
174 *pflags = flags;
175 }
176 return true;
177}
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