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-rw-r--r--source/smbd/vfs.c147
1 files changed, 111 insertions, 36 deletions
diff --git a/source/smbd/vfs.c b/source/smbd/vfs.c
index 5e1dc68bdb4..a2291eba08f 100644
--- a/source/smbd/vfs.c
+++ b/source/smbd/vfs.c
@@ -3,6 +3,7 @@
Version 1.9.
VFS initialisation and support functions
Copyright (C) Tim Potter 1999
+ Copyright (C) Alexander Bokovoy 2002
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
@@ -17,6 +18,8 @@
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.
+
+ This work was sponsored by Optifacio Software Services, Inc.
*/
#include "includes.h"
@@ -28,6 +31,12 @@ struct vfs_syminfo {
void *fptr;
};
+/*
+ Opaque (final) vfs operations. This is a combination of first-met opaque vfs operations
+ across all currently processed modules. */
+
+static vfs_op_tuple vfs_opaque_ops[SMB_VFS_OP_LAST];
+
/* Default vfs hooks. WARNING: The order of these initialisers is
very important. They must be in the same order as defined in
vfs.h. Change at your own peril. */
@@ -117,58 +126,75 @@ static struct vfs_ops default_vfs_ops = {
initialise default vfs hooks
****************************************************************************/
-static BOOL vfs_init_default(connection_struct *conn)
+static void vfs_init_default(connection_struct *conn)
{
DEBUG(3, ("Initialising default vfs hooks\n"));
memcpy(&conn->vfs_ops, &default_vfs_ops, sizeof(struct vfs_ops));
- return True;
+ conn->vfs_private = NULL;
}
/****************************************************************************
initialise custom vfs hooks
****************************************************************************/
-static BOOL vfs_init_custom(connection_struct *conn)
+static BOOL vfs_init_custom(connection_struct *conn, const char *vfs_object)
{
int vfs_version = -1;
- struct vfs_ops *ops, *(*init_fptr)(int *, struct vfs_ops *);
+ vfs_op_tuple *ops, *(*init_fptr)(int *, const struct vfs_ops *, struct smb_vfs_handle_struct *);
+ int i;
- DEBUG(3, ("Initialising custom vfs hooks from %s\n", lp_vfsobj(SNUM(conn))));
+ DEBUG(3, ("Initialising custom vfs hooks from %s\n", vfs_object));
/* Open object file */
- if ((conn->dl_handle = sys_dlopen(lp_vfsobj(SNUM(conn)), RTLD_NOW | RTLD_GLOBAL)) == NULL) {
- DEBUG(0, ("Error opening %s: %s\n", lp_vfsobj(SNUM(conn)), sys_dlerror()));
+ if ((conn->vfs_private->handle = sys_dlopen(vfs_object, RTLD_NOW)) == NULL) {
+ DEBUG(0, ("Error opening %s: %s\n", vfs_object, sys_dlerror()));
return False;
}
/* Get handle on vfs_init() symbol */
- init_fptr = (struct vfs_ops *(*)(int *, struct vfs_ops *))sys_dlsym(conn->dl_handle, "vfs_init");
+ init_fptr = (vfs_op_tuple *(*)(int *, const struct vfs_ops *, struct smb_vfs_handle_struct *))sys_dlsym(conn->vfs_private->handle, "vfs_init");
if (init_fptr == NULL) {
- DEBUG(0, ("No vfs_init() symbol found in %s\n", lp_vfsobj(SNUM(conn))));
+ DEBUG(0, ("No vfs_init() symbol found in %s\n", vfs_object));
return False;
}
/* Initialise vfs_ops structure */
- conn->vfs_ops = default_vfs_ops;
-
- if ((ops = init_fptr(&vfs_version, &default_vfs_ops)) == NULL) {
- DEBUG(0, ("vfs_init function from %s failed\n", lp_vfsobj(SNUM(conn))));
- return False;
- }
-
- if (vfs_version != SMB_VFS_INTERFACE_VERSION) {
- DEBUG(0, ("vfs_init returned wrong interface version info (was %d, should be %d)\n",
- vfs_version, SMB_VFS_INTERFACE_VERSION ));
- return False;
- }
-
- if (ops != &conn->vfs_ops) {
- memcpy(&conn->vfs_ops, ops, sizeof(struct vfs_ops));
+ if ((ops = init_fptr(&vfs_version, &conn->vfs_ops, conn->vfs_private)) == NULL) {
+ DEBUG(0, ("vfs_init() function from %s failed\n", vfs_object));
+ return False;
+ }
+
+ if ((vfs_version < SMB_VFS_INTERFACE_CASCADED)) {
+ DEBUG(0, ("vfs_init() returned wrong interface version info (was %d, should be no less than %d)\n",
+ vfs_version, SMB_VFS_INTERFACE_VERSION ));
+ return False;
+ }
+
+ if ((vfs_version < SMB_VFS_INTERFACE_VERSION)) {
+ DEBUG(0, ("Warning: vfs_init() states that module confirms interface version #%d, current interface version is #%d.\n\
+Proceeding in compatibility mode, new operations (since version #%d) will fallback to default ones.\n",
+ vfs_version, SMB_VFS_INTERFACE_VERSION, vfs_version ));
+ return False;
+ }
+
+ for(i=0; ops[i].op != NULL; i++) {
+ DEBUG(3, ("Checking operation #%d (type %d, layer %d)\n", i, ops[i].type, ops[i].layer));
+ if(ops[i].layer == SMB_VFS_LAYER_OPAQUE) {
+ /* Check whether this operation was already made opaque by different module */
+ if(vfs_opaque_ops[ops[i].type].op == ((void**)&default_vfs_ops)[ops[i].type]) {
+ /* No, it isn't overloaded yet. Overload. */
+ DEBUG(3, ("Making operation type %d opaque [module %s]\n", ops[i].type, vfs_object));
+ vfs_opaque_ops[ops[i].type] = ops[i];
+ }
+ }
+ /* Change current VFS disposition*/
+ DEBUG(3, ("Accepting operation type %d from module %s\n", ops[i].type, vfs_object));
+ ((void**)&conn->vfs_ops)[ops[i].type] = ops[i].op;
}
return True;
@@ -180,21 +206,70 @@ static BOOL vfs_init_custom(connection_struct *conn)
BOOL smbd_vfs_init(connection_struct *conn)
{
+ char **vfs_objects, *vfsobj, *vfs_module, *vfs_path;
+ int nobj, i;
+ struct smb_vfs_handle_struct *handle;
+
+ /* Normal share - initialise with disk access functions */
+ vfs_init_default(conn);
+
+ /* Override VFS functions if 'vfs object' was specified*/
if (*lp_vfsobj(SNUM(conn))) {
-
- /* Loadable object file */
-
- if (!vfs_init_custom(conn)) {
- DEBUG(0, ("smbd_vfs_init: vfs_init_custom failed\n"));
- return False;
+ vfsobj = NULL;
+ for(i=0; i<SMB_VFS_OP_LAST; i++) {
+ vfs_opaque_ops[i].op = ((void**)&default_vfs_ops)[i];
+ vfs_opaque_ops[i].type = i;
+ vfs_opaque_ops[i].layer = SMB_VFS_LAYER_OPAQUE;
+ }
+ if (string_set(&vfsobj, lp_vfsobj(SNUM(conn)))) {
+ /* Parse passed modules specification to array of modules */
+ set_first_token(vfsobj);
+ /* We are using default separators: ' \t\r\n' */
+ vfs_objects = toktocliplist(&nobj, NULL);
+ if (vfs_objects) {
+ vfs_path = lp_vfs_path(SNUM(conn));
+ conn->vfs_private = NULL;
+ for(i=nobj-1; i>=0; i--) {
+ handle = (struct smb_vfs_handle_struct *) smb_xmalloc(sizeof(smb_vfs_handle_struct));
+ /* Loadable object file */
+ handle->handle = NULL;
+ DLIST_ADD(conn->vfs_private, handle)
+ vfs_module = NULL;
+ if (vfs_path) {
+ asprintf(&vfs_module, "%s/%s", vfs_path, vfs_objects[i]);
+ } else {
+ asprintf(&vfs_module, "%s", vfs_objects[i]);
+ }
+ if (!vfs_init_custom(conn, vfs_module)) {
+ DEBUG(0, ("smbd_vfs_init: vfs_init_custom failed for %s\n", vfs_module));
+ string_free(&vfsobj);
+ SAFE_FREE(vfs_module);
+ return False;
+ }
+ SAFE_FREE(vfs_module);
+ }
+ }
+ string_free(&vfsobj);
+ return True;
}
-
- return True;
}
-
- /* Normal share - initialise with disk access functions */
-
- return vfs_init_default(conn);
+ return True;
+}
+
+/*******************************************************************
+ Create vfs_ops reflecting current vfs_opaque_ops
+*******************************************************************/
+struct vfs_ops *smb_vfs_get_opaque_ops(void)
+{
+ int i;
+ struct vfs_ops *ops;
+
+ ops = smb_xmalloc(sizeof(struct vfs_ops));
+
+ for(i=0; i<SMB_VFS_OP_LAST; i++) {
+ ((void**)ops)[i] = vfs_opaque_ops[i].op;
+ }
+ return ops;
}
/*******************************************************************
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