2 * Expand msdfs targets based on client IP
4 * Copyright (C) Volker Lendecke, 2004
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
23 #define DBGC_CLASS DBGC_VFS
25 extern userdom_struct current_user_info
;
27 /**********************************************************
28 Under mapfile we expect a table of the following format:
30 IP-Prefix whitespace expansion
33 192.168.234 local.samba.org
34 192.168 remote.samba.org
37 This is to redirect a DFS client to a host close to it.
38 ***********************************************************/
40 static char *read_target_host(TALLOC_CTX
*ctx
, const char *mapfile
)
47 f
= x_fopen(mapfile
, O_RDONLY
, 0);
50 DEBUG(0,("can't open IP map %s. Error %s\n",
51 mapfile
, strerror(errno
) ));
55 DEBUG(10, ("Scanning mapfile [%s]\n", mapfile
));
57 while (x_fgets(buf
, sizeof(buf
), f
) != NULL
) {
58 char addr
[INET6_ADDRSTRLEN
];
60 if ((strlen(buf
) > 0) && (buf
[strlen(buf
)-1] == '\n'))
61 buf
[strlen(buf
)-1] = '\0';
63 DEBUG(10, ("Scanning line [%s]\n", buf
));
65 space
= strchr_m(buf
, ' ');
68 DEBUG(0, ("Ignoring invalid line %s\n", buf
));
74 if (strncmp(client_addr(get_client_fd(),addr
,sizeof(addr
)),
75 buf
, strlen(buf
)) == 0) {
89 while (isspace(*space
))
92 return talloc_strdup(ctx
, space
);
95 /**********************************************************
97 Expand the msdfs target host using read_target_host
98 explained above. The syntax used in the msdfs link is
100 msdfs:@table-filename@/share
102 Everything between and including the two @-signs is
103 replaced by the substitution string found in the table
106 ***********************************************************/
108 static char *expand_msdfs_target(TALLOC_CTX
*ctx
,
109 connection_struct
*conn
,
112 char *mapfilename
= NULL
;
113 char *filename_start
= strchr_m(target
, '@');
114 char *filename_end
= NULL
;
115 int filename_len
= 0;
116 char *targethost
= NULL
;
117 char *new_target
= NULL
;
119 if (filename_start
== NULL
) {
120 DEBUG(10, ("No filename start in %s\n", target
));
124 filename_end
= strchr_m(filename_start
+1, '@');
126 if (filename_end
== NULL
) {
127 DEBUG(10, ("No filename end in %s\n", target
));
131 filename_len
= PTR_DIFF(filename_end
, filename_start
+1);
132 mapfilename
= talloc_strdup(ctx
, filename_start
+1);
136 mapfilename
[filename_len
] = '\0';
138 DEBUG(10, ("Expanding from table [%s]\n", mapfilename
));
140 if ((targethost
= read_target_host(ctx
, mapfilename
)) == NULL
) {
141 DEBUG(1, ("Could not expand target host from file %s\n",
146 targethost
= talloc_sub_advanced(ctx
,
147 lp_servicename(SNUM(conn
)),
148 conn
->server_info
->unix_name
,
150 conn
->server_info
->gid
,
151 get_current_username(),
152 current_user_info
.domain
,
155 DEBUG(10, ("Expanded targethost to %s\n", targethost
));
157 /* Replace the part between '@...@' */
158 *filename_start
= '\0';
159 new_target
= talloc_asprintf(ctx
,
168 DEBUG(10, ("New DFS target: %s\n", new_target
));
172 static int expand_msdfs_readlink(struct vfs_handle_struct
*handle
,
173 const char *path
, char *buf
, size_t bufsiz
)
175 TALLOC_CTX
*ctx
= talloc_tos();
177 char *target
= TALLOC_ARRAY(ctx
, char, PATH_MAX
+1);
183 result
= SMB_VFS_NEXT_READLINK(handle
, path
, target
,
189 target
[result
] = '\0';
191 if ((strncmp(target
, "msdfs:", strlen("msdfs:")) == 0) &&
192 (strchr_m(target
, '@') != NULL
)) {
193 target
= expand_msdfs_target(ctx
, handle
->conn
, target
);
200 safe_strcpy(buf
, target
, bufsiz
-1);
204 /* VFS operations structure */
206 static vfs_op_tuple expand_msdfs_ops
[] = {
207 {SMB_VFS_OP(expand_msdfs_readlink
), SMB_VFS_OP_READLINK
,
208 SMB_VFS_LAYER_TRANSPARENT
},
209 {SMB_VFS_OP(NULL
), SMB_VFS_OP_NOOP
, SMB_VFS_LAYER_NOOP
}
212 NTSTATUS
vfs_expand_msdfs_init(void);
213 NTSTATUS
vfs_expand_msdfs_init(void)
215 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION
, "expand_msdfs",