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 2 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, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 #define DBGC_CLASS DBGC_VFS
26 extern userdom_struct current_user_info
;
28 /**********************************************************
29 Under mapfile we expect a table of the following format:
31 IP-Prefix whitespace expansion
34 192.168.234 local.samba.org
35 192.168 remote.samba.org
38 This is to redirect a DFS client to a host close to it.
39 ***********************************************************/
41 static BOOL
read_target_host(const char *mapfile
, pstring targethost
)
48 f
= x_fopen(mapfile
, O_RDONLY
, 0);
51 DEBUG(0,("can't open IP map %s. Error %s\n",
52 mapfile
, strerror(errno
) ));
56 DEBUG(10, ("Scanning mapfile [%s]\n", mapfile
));
58 while (x_fgets(buf
, sizeof(buf
), f
) != NULL
) {
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(), buf
, strlen(buf
)) == 0) {
87 while (isspace(*space
))
90 pstrcpy(targethost
, space
);
94 /**********************************************************
96 Expand the msdfs target host using read_target_host
97 explained above. The syntax used in the msdfs link is
99 msdfs:@table-filename@/share
101 Everything between and including the two @-signs is
102 replaced by the substitution string found in the table
105 ***********************************************************/
107 static BOOL
expand_msdfs_target(connection_struct
* conn
, pstring target
)
110 char *filename_start
= strchr_m(target
, '@');
116 if (filename_start
== NULL
) {
117 DEBUG(10, ("No filename start in %s\n", target
));
121 filename_end
= strchr_m(filename_start
+1, '@');
123 if (filename_end
== NULL
) {
124 DEBUG(10, ("No filename end in %s\n", target
));
128 filename_len
= PTR_DIFF(filename_end
, filename_start
+1);
129 pstrcpy(mapfilename
, filename_start
+1);
130 mapfilename
[filename_len
] = '\0';
132 DEBUG(10, ("Expanding from table [%s]\n", mapfilename
));
134 if (!read_target_host(mapfilename
, targethost
)) {
135 DEBUG(1, ("Could not expand target host from file %s\n",
140 standard_sub_advanced(lp_servicename(SNUM(conn
)), conn
->user
,
141 conn
->connectpath
, conn
->gid
,
142 get_current_username(),
143 current_user_info
.domain
,
144 mapfilename
, sizeof(mapfilename
));
146 DEBUG(10, ("Expanded targethost to %s\n", targethost
));
148 *filename_start
= '\0';
149 pstrcpy(new_target
, target
);
150 pstrcat(new_target
, targethost
);
151 pstrcat(new_target
, filename_end
+1);
153 DEBUG(10, ("New DFS target: %s\n", new_target
));
154 pstrcpy(target
, new_target
);
158 static int expand_msdfs_readlink(struct vfs_handle_struct
*handle
,
159 const char *path
, char *buf
, size_t bufsiz
)
164 result
= SMB_VFS_NEXT_READLINK(handle
, path
, target
,
170 target
[result
] = '\0';
172 if ((strncmp(target
, "msdfs:", strlen("msdfs:")) == 0) &&
173 (strchr_m(target
, '@') != NULL
)) {
174 if (!expand_msdfs_target(handle
->conn
, target
)) {
180 safe_strcpy(buf
, target
, bufsiz
-1);
184 /* VFS operations structure */
186 static vfs_op_tuple expand_msdfs_ops
[] = {
187 {SMB_VFS_OP(expand_msdfs_readlink
), SMB_VFS_OP_READLINK
,
188 SMB_VFS_LAYER_TRANSPARENT
},
189 {SMB_VFS_OP(NULL
), SMB_VFS_OP_NOOP
, SMB_VFS_LAYER_NOOP
}
192 NTSTATUS
vfs_expand_msdfs_init(void)
194 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION
, "expand_msdfs",