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Move the Client-IP based msdfs target expansion to a VFS module.

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Volker
This commit is contained in:
Volker Lendecke 0001-01-01 00:00:00 +00:00
parent 8431b985d6
commit 9cb6a4d76f
4 changed files with 197 additions and 135 deletions
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6
source/Makefile.in
View File

@ -319,6 +319,7 @@ VFS_NETATALK_OBJ = modules/vfs_netatalk.o
VFS_DEFAULT_QUOTA_OBJ = modules/vfs_default_quota.o
VFS_READONLY_OBJ = modules/vfs_readonly.o modules/getdate.o
VFS_CAP_OBJ = modules/vfs_cap.o
VFS_EXPAND_MSDFS_OBJ = modules/vfs_expand_msdfs.o
PLAINTEXT_AUTH_OBJ = auth/pampass.o auth/pass_check.o
@ -1171,6 +1172,11 @@ bin/cap.@SHLIBEXT@: $(VFS_CAP_OBJ:.o=.@PICSUFFIX@)
@$(SHLD) $(LDSHFLAGS) -o $@ $(VFS_CAP_OBJ:.o=.@PICSUFFIX@) \
@SONAMEFLAG@`basename $@`
bin/expand_msdfs.@SHLIBEXT@: $(VFS_EXPAND_MSDFS_OBJ:.o=.@PICSUFFIX@)
@echo "Building plugin $@"
@$(SHLD) $(LDSHFLAGS) -o $@ $(VFS_EXPAND_MSDFS_OBJ:.o=.@PICSUFFIX@) \
@SONAMEFLAG@`basename $@`
bin/wbinfo@EXEEXT@: $(WBINFO_OBJ) @BUILD_POPT@ bin/.dummy
@echo Linking $@
@$(LINK) -o $@ $(WBINFO_OBJ) $(LIBS) @POPTLIBS@

3
source/configure.in
View File

@ -360,7 +360,7 @@ dnl These have to be built static:
default_static_modules="pdb_smbpasswd pdb_tdbsam rpc_lsa rpc_samr rpc_reg rpc_lsa_ds rpc_wks rpc_net rpc_dfs rpc_srv rpc_spoolss auth_rhosts auth_sam auth_unix auth_winbind auth_server auth_domain auth_builtin"
dnl These are preferably build shared, and static if dlopen() is not available
default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_netatalk vfs_fake_perms vfs_default_quota vfs_readonly vfs_cap charset_CP850 charset_CP437"
default_shared_modules="vfs_recycle vfs_audit vfs_extd_audit vfs_netatalk vfs_fake_perms vfs_default_quota vfs_readonly vfs_cap vfs_expand_msdfs charset_CP850 charset_CP437"
if test "x$developer" = xyes; then
default_static_modules="$default_static_modules rpc_echo"
@ -4371,6 +4371,7 @@ SMB_MODULE(vfs_fake_perms, \$(VFS_FAKE_PERMS_OBJ), "bin/fake_perms.$SHLIBEXT", V
SMB_MODULE(vfs_default_quota, \$(VFS_DEFAULT_QUOTA_OBJ), "bin/default_quota.$SHLIBEXT", VFS)
SMB_MODULE(vfs_readonly, \$(VFS_READONLY_OBJ), "bin/readonly.$SHLIBEXT", VFS)
SMB_MODULE(vfs_cap, \$(VFS_CAP_OBJ), "bin/cap.$SHLIBEXT", VFS)
SMB_MODULE(vfs_expand_msdfs, \$(VFS_EXPAND_MSDFS_OBJ), "bin/expand_msdfs.$SHLIBEXT", VFS)
SMB_SUBSYSTEM(VFS,smbd/vfs.o)
AC_DEFINE_UNQUOTED(STRING_STATIC_MODULES, "$string_static_modules", [String list of builtin modules])

184
source/modules/vfs_expand_msdfs.c Normal file
View File

@ -0,0 +1,184 @@
/*
* 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=fgets_slash(buf, sizeof(buf), f)) != NULL) {
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 (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);
}

139
source/msdfs/msdfs.c
View File

@ -158,134 +158,13 @@ static BOOL create_conn_struct( connection_struct *conn, int snum, char *path)
}
/**********************************************************
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=fgets_slash(buf, sizeof(buf), f)) != NULL) {
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;
}
/**********************************************************************
Parse the contents of a symlink to verify if it is an msdfs referral
A valid referral is of the form: msdfs:server1\share1,server2\share2
**********************************************************************/
static BOOL parse_symlink(connection_struct* conn, char* buf,
struct referral** preflist, int* refcount)
static BOOL parse_symlink(char* buf,struct referral** preflist,
int* refcount)
{
pstring temp;
char* prot;
@ -318,22 +197,14 @@ static BOOL parse_symlink(connection_struct* conn, char* buf,
for(i=0;i<count;i++) {
char *p;
pstring target;
pstrcpy(target, alt_path[i]);
if (strchr_m(target, '@') != NULL) {
if (!expand_msdfs_target(conn, target))
return False;
}
/* replace all /'s in the alternate path by a \ */
for(p = target; *p && ((p = strchr_m(p,'/'))!=NULL); p++) {
for(p = alt_path[i]; *p && ((p = strchr_m(p,'/'))!=NULL); p++) {
*p = '\\';
}
/* Remove leading '\\'s */
p = target;
p = alt_path[i];
while (*p && (*p == '\\')) {
p++;
}
@ -385,7 +256,7 @@ BOOL is_msdfs_link(connection_struct* conn, char * path,
referral[referral_len] = '\0';
DEBUG(5,("is_msdfs_link: %s -> %s\n",path,referral));
if (parse_symlink(conn, referral, reflistp, refcnt))
if (parse_symlink(referral, reflistp, refcnt))
return True;
}
return False;