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 /**********************************************************
27 Under mapfile we expect a table of the following format:
29 IP-Prefix whitespace expansion
32 192.168.234 local.samba.org
33 192.168 remote.samba.org
36 This is to redirect a DFS client to a host close to it.
37 ***********************************************************/
39 static BOOL read_target_host(const char *mapfile, pstring targethost)
46 f = x_fopen(mapfile, O_RDONLY, 0);
49 DEBUG(0,("can't open IP map %s. Error %s\n",
50 mapfile, strerror(errno) ));
54 DEBUG(10, ("Scanning mapfile [%s]\n", mapfile));
56 while (x_fgets(buf, sizeof(buf), f) != NULL) {
58 if ((strlen(buf) > 0) && (buf[strlen(buf)-1] == '\n'))
59 buf[strlen(buf)-1] = '\0';
61 DEBUG(10, ("Scanning line [%s]\n", buf));
63 space = strchr_m(buf, ' ');
66 DEBUG(0, ("Ignoring invalid line %s\n", buf));
72 if (strncmp(client_addr(), buf, strlen(buf)) == 0) {
85 while (isspace(*space))
88 pstrcpy(targethost, space);
92 /**********************************************************
94 Expand the msdfs target host using read_target_host
95 explained above. The syntax used in the msdfs link is
97 msdfs:@table-filename@/share
99 Everything between and including the two @-signs is
100 replaced by the substitution string found in the table
103 ***********************************************************/
105 static BOOL expand_msdfs_target(connection_struct* conn, pstring target)
108 char *filename_start = strchr_m(target, '@');
114 if (filename_start == NULL) {
115 DEBUG(10, ("No filename start in %s\n", target));
119 filename_end = strchr_m(filename_start+1, '@');
121 if (filename_end == NULL) {
122 DEBUG(10, ("No filename end in %s\n", target));
126 filename_len = PTR_DIFF(filename_end, filename_start+1);
127 pstrcpy(mapfilename, filename_start+1);
128 mapfilename[filename_len] = '\0';
130 DEBUG(10, ("Expanding from table [%s]\n", mapfilename));
132 if (!read_target_host(mapfilename, targethost)) {
133 DEBUG(1, ("Could not expand target host from file %s\n",
138 standard_sub_conn(conn, mapfilename, sizeof(mapfilename));
140 DEBUG(10, ("Expanded targethost to %s\n", targethost));
142 *filename_start = '\0';
143 pstrcpy(new_target, target);
144 pstrcat(new_target, targethost);
145 pstrcat(new_target, filename_end+1);
147 DEBUG(10, ("New DFS target: %s\n", new_target));
148 pstrcpy(target, new_target);
152 static int expand_msdfs_readlink(struct vfs_handle_struct *handle,
153 struct connection_struct *conn,
154 const char *path, char *buf, size_t bufsiz)
159 result = SMB_VFS_NEXT_READLINK(handle, conn, path, target,
165 target[result] = '\0';
167 if ((strncmp(target, "msdfs:", strlen("msdfs:")) == 0) &&
168 (strchr_m(target, '@') != NULL)) {
169 if (!expand_msdfs_target(conn, target)) {
175 safe_strcpy(buf, target, bufsiz-1);
179 /* VFS operations structure */
181 static vfs_op_tuple expand_msdfs_ops[] = {
182 {SMB_VFS_OP(expand_msdfs_readlink), SMB_VFS_OP_READLINK,
183 SMB_VFS_LAYER_TRANSPARENT},
184 {SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
187 NTSTATUS vfs_expand_msdfs_init(void)
189 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "expand_msdfs",