1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21
22 /*
23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
24 * Use is subject to license terms.
25 */
26
27 /*
28 * SMB plugin for reparse point operations.
29 * For more details refer to section 5.4 of PSARC/2009/387
30 */
31
32 #include <stdio.h>
33 #include <unistd.h>
34 #include <strings.h>
35 #include <string.h>
36 #include <sys/types.h>
37 #include <sys/errno.h>
38 #include <syslog.h>
39 #include "rp_plugin.h"
40
41 #include <smbsrv/smb_dfs.h>
42
43 static char *smb_rpo_service_type(void);
44 static boolean_t smb_rpo_supports_svc(const char *);
45 static int smb_rpo_deref(const char *, const char *, char *, size_t *);
46 static int smb_rpo_form(const char *, const char *, char *, size_t *);
47
48 struct rp_plugin_ops rp_plugin_ops = {
49 RP_PLUGIN_V1,
50 NULL, /* rpo_init */
51 NULL, /* rpo_fini */
52 smb_rpo_service_type,
53 smb_rpo_supports_svc,
54 smb_rpo_form,
55 smb_rpo_deref
56 };
57
58 /*
59 * Reports supported service type
60 */
61 static char *
smb_rpo_service_type(void)62 smb_rpo_service_type(void)
63 {
64 return (DFS_REPARSE_SVCTYPE);
65 }
66
67 /*
68 * Determines whether this plugin supports the given service type
69 */
70 static boolean_t
smb_rpo_supports_svc(const char * svc_type)71 smb_rpo_supports_svc(const char *svc_type)
72 {
73 if (svc_type == NULL)
74 return (B_FALSE);
75
76 if (strncasecmp(svc_type, DFS_REPARSE_SVCTYPE,
77 strlen(DFS_REPARSE_SVCTYPE)) == 0)
78 return (B_TRUE);
79
80 return (B_FALSE);
81 }
82
83 /*
84 * Accepts the service-specific item from the reparse point and returns the
85 * service-specific data requested. The caller specifies the size of the
86 * buffer provided via *bufsz; the routine will fail with EOVERFLOW if
87 * the results will not fit in the buffer, in which case, *bufsz will
88 * contain the number of bytes needed to hold the results.
89 *
90 * Currently, there is no transformation is needed to data stored in
91 * a reparse point for DFS, so 'buf' will contain the same data as
92 * 'svc_data'.
93 */
94 static int
smb_rpo_deref(const char * svc_type,const char * svc_data,char * buf,size_t * bufsz)95 smb_rpo_deref(const char *svc_type, const char *svc_data, char *buf,
96 size_t *bufsz)
97 {
98 int slen;
99
100 if ((!svc_type) || (!svc_data) || (!buf) || (!bufsz))
101 return (EINVAL);
102
103 if (strcasecmp(svc_type, DFS_REPARSE_SVCTYPE) != 0)
104 return (ENOTSUP);
105
106 slen = strlen(svc_data) + 1;
107
108 if (slen > *bufsz) {
109 *bufsz = slen;
110 return (EOVERFLOW);
111 }
112
113 (void) strlcpy(buf, svc_data, *bufsz);
114
115 return (0);
116 }
117
118 /*
119 * Returns a string with the appropriate service-specific syntax to create
120 * a reparse point of the given svc_type, using the string from the
121 * reparse_add() call as part of the string.
122 */
123 static int
smb_rpo_form(const char * svc_type,const char * svc_data,char * buf,size_t * bufsz)124 smb_rpo_form(const char *svc_type, const char *svc_data, char *buf,
125 size_t *bufsz)
126 {
127 int slen;
128
129 if ((!svc_type) || (!svc_data) || (!buf) || (!bufsz))
130 return (EINVAL);
131
132 slen = strlen(svc_data) + 1;
133
134 if (slen > *bufsz) {
135 *bufsz = slen;
136 return (EOVERFLOW);
137 }
138
139 (void) strlcpy(buf, svc_data, *bufsz);
140
141 return (0);
142 }
143