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/*
* Expand msdfs targets based on client IP
*
* Copyright (C) Volker Lendecke, 2004
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
/**********************************************************
Under mapfile we expect a table of the following format:
IP-Prefix whitespace expansion
For example:
192.168.234 local.samba.org
192.168 remote.samba.org
default.samba.org
This is to redirect a DFS client to a host close to it.
***********************************************************/
static BOOL read_target_host(const char *mapfile, pstring targethost)
{
XFILE *f;
pstring buf;
char *s, *space = buf;
BOOL found = False;
f = x_fopen(mapfile, O_RDONLY, 0);
if (f == NULL) {
DEBUG(0,("can't open IP map %s. Error %s\n",
mapfile, strerror(errno) ));
return False;
}
DEBUG(10, ("Scanning mapfile [%s]\n", mapfile));
while ((s=x_fgets(buf, sizeof(buf), f)) != NULL) {
if ((strlen(buf) > 0) && (buf[strlen(buf)-1] == '\n'))
buf[strlen(buf)-1] = '\0';
DEBUG(10, ("Scanning line [%s]\n", buf));
space = strchr_m(buf, ' ');
if (space == NULL) {
DEBUG(0, ("Ignoring invalid line %s\n", buf));
continue;
}
*space = '\0';
if (strncmp(client_addr(), buf, strlen(buf)) == 0) {
found = True;
break;
}
}
x_fclose(f);
if (!found)
return False;
space += 1;
while (isspace(*space))
space += 1;
pstrcpy(targethost, space);
return True;
}
/**********************************************************
Expand the msdfs target host using read_target_host
explained above. The syntax used in the msdfs link is
msdfs:@table-filename@/share
Everything between and including the two @-signs is
replaced by the substitution string found in the table
described above.
***********************************************************/
static BOOL expand_msdfs_target(connection_struct* conn, pstring target)
{
pstring mapfilename;
char *filename_start = strchr_m(target, '@');
char *filename_end;
int filename_len;
pstring targethost;
pstring new_target;
if (filename_start == NULL) {
DEBUG(10, ("No filename start in %s\n", target));
return False;
}
filename_end = strchr_m(filename_start+1, '@');
if (filename_end == NULL) {
DEBUG(10, ("No filename end in %s\n", target));
return False;
}
filename_len = PTR_DIFF(filename_end, filename_start+1);
pstrcpy(mapfilename, filename_start+1);
mapfilename[filename_len] = '\0';
DEBUG(10, ("Expanding from table [%s]\n", mapfilename));
if (!read_target_host(mapfilename, targethost)) {
DEBUG(1, ("Could not expand target host from file %s\n",
mapfilename));
return False;
}
standard_sub_conn(conn, mapfilename, sizeof(mapfilename));
DEBUG(10, ("Expanded targethost to %s\n", targethost));
*filename_start = '\0';
pstrcpy(new_target, target);
pstrcat(new_target, targethost);
pstrcat(new_target, filename_end+1);
DEBUG(10, ("New DFS target: %s\n", new_target));
pstrcpy(target, new_target);
return True;
}
static int expand_msdfs_readlink(struct vfs_handle_struct *handle,
struct connection_struct *conn,
const char *path, char *buf, size_t bufsiz)
{
pstring target;
int result;
result = SMB_VFS_NEXT_READLINK(handle, conn, path, target,
sizeof(target));
if (result < 0)
return result;
target[result] = '\0';
if ((strncmp(target, "msdfs:", strlen("msdfs:")) == 0) &&
(strchr_m(target, '@') != NULL)) {
if (!expand_msdfs_target(conn, target)) {
errno = ENOENT;
return -1;
}
}
safe_strcpy(buf, target, bufsiz-1);
return strlen(buf);
}
/* VFS operations structure */
static vfs_op_tuple expand_msdfs_ops[] = {
{SMB_VFS_OP(expand_msdfs_readlink), SMB_VFS_OP_READLINK,
SMB_VFS_LAYER_TRANSPARENT},
{SMB_VFS_OP(NULL), SMB_VFS_OP_NOOP, SMB_VFS_LAYER_NOOP}
};
NTSTATUS vfs_expand_msdfs_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "expand_msdfs",
expand_msdfs_ops);
}
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