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 bool read_target_host(const char *mapfile, pstring targethost)
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(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);
193 NTSTATUS vfs_expand_msdfs_init(void)
195 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "expand_msdfs",