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https://github.com/samba-team/samba.git
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476672b647
Signed-off-by: Michael Adam <obnox@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
250 lines
6.6 KiB
C
250 lines
6.6 KiB
C
/*
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Unix SMB/CIFS implementation.
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NTVFS base code
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Copyright (C) Andrew Tridgell 2003
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Copyright (C) Stefan (metze) Metzmacher 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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this implements the core code for all NTVFS modules. Backends register themselves here.
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*/
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#include "includes.h"
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#include "../lib/util/dlinklist.h"
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#include "ntvfs/ntvfs.h"
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#include "param/param.h"
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#include "lib/util/samba_modules.h"
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/* the list of currently registered NTVFS backends, note that there
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* can be more than one backend with the same name, as long as they
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* have different typesx */
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static struct ntvfs_backend {
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const struct ntvfs_ops *ops;
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} *backends = NULL;
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static int num_backends;
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/*
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register a NTVFS backend.
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The 'name' can be later used by other backends to find the operations
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structure for this backend.
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The 'type' is used to specify whether this is for a disk, printer or IPC$ share
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*/
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NTSTATUS ntvfs_register(const struct ntvfs_ops *ops,
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const struct ntvfs_critical_sizes *const sizes)
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{
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struct ntvfs_ops *new_ops;
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if (ntvfs_interface_differs(sizes)) {
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DEBUG(0, ("NTVFS backend '%s' for type %d "
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"failed version check\n",
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ops->name, (int)ops->type));
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return NT_STATUS_BAD_FUNCTION_TABLE;
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}
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if (ntvfs_backend_byname(ops->name, ops->type) != NULL) {
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/* its already registered! */
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DEBUG(0,("NTVFS backend '%s' for type %d already registered\n",
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ops->name, (int)ops->type));
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return NT_STATUS_OBJECT_NAME_COLLISION;
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}
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backends = realloc_p(backends, struct ntvfs_backend, num_backends+1);
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if (!backends) {
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smb_panic("out of memory in ntvfs_register");
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}
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new_ops = smb_xmemdup(ops, sizeof(*ops));
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new_ops->name = smb_xstrdup(ops->name);
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backends[num_backends].ops = new_ops;
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num_backends++;
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DEBUG(3,("NTVFS backend '%s' for type %d registered\n",
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ops->name,ops->type));
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return NT_STATUS_OK;
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}
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/*
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return the operations structure for a named backend of the specified type
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*/
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const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type)
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{
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int i;
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for (i=0;i<num_backends;i++) {
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if (backends[i].ops->type == type &&
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strcmp(backends[i].ops->name, name) == 0) {
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return backends[i].ops;
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}
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}
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return NULL;
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}
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/*
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return the NTVFS interface version, and the size of some critical types
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This can be used by backends to either detect compilation errors, or provide
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multiple implementations for different smbd compilation options in one module
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*/
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static const NTVFS_CURRENT_CRITICAL_SIZES(critical_sizes);
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const struct ntvfs_critical_sizes *ntvfs_interface_version(void)
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{
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return &critical_sizes;
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}
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bool ntvfs_interface_differs(const struct ntvfs_critical_sizes *const iface)
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{
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/* The comparison would be easier with memcmp, but compiler-interset
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* alignment padding is not guaranteed to be zeroed.
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*/
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#define FIELD_DIFFERS(field) (iface->field != critical_sizes.field)
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if (FIELD_DIFFERS(interface_version))
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return true;
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if (FIELD_DIFFERS(sizeof_ntvfs_critical_sizes))
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return true;
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if (FIELD_DIFFERS(sizeof_ntvfs_context))
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return true;
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if (FIELD_DIFFERS(sizeof_ntvfs_module_context))
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return true;
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if (FIELD_DIFFERS(sizeof_ntvfs_ops))
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return true;
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if (FIELD_DIFFERS(sizeof_ntvfs_async_state))
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return true;
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if (FIELD_DIFFERS(sizeof_ntvfs_request))
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return true;
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/* Versions match. */
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return false;
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#undef FIELD_DIFFERS
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}
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/*
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initialise a connection structure to point at a NTVFS backend
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*/
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NTSTATUS ntvfs_init_connection(TALLOC_CTX *mem_ctx, struct share_config *scfg, enum ntvfs_type type,
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enum protocol_types protocol,
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uint64_t ntvfs_client_caps,
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struct tevent_context *ev, struct imessaging_context *msg,
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struct loadparm_context *lp_ctx,
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struct server_id server_id, struct ntvfs_context **_ctx)
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{
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const char **handlers = share_string_list_option(mem_ctx, scfg, SHARE_NTVFS_HANDLER);
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int i;
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struct ntvfs_context *ctx;
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if (!handlers) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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ctx = talloc_zero(mem_ctx, struct ntvfs_context);
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NT_STATUS_HAVE_NO_MEMORY(ctx);
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ctx->protocol = protocol;
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ctx->client_caps = ntvfs_client_caps;
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ctx->type = type;
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ctx->config = talloc_steal(ctx, scfg);
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ctx->event_ctx = ev;
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ctx->msg_ctx = msg;
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ctx->server_id = server_id;
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ctx->lp_ctx = lp_ctx;
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for (i=0; handlers[i]; i++) {
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struct ntvfs_module_context *ntvfs;
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ntvfs = talloc_zero(ctx, struct ntvfs_module_context);
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NT_STATUS_HAVE_NO_MEMORY(ntvfs);
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ntvfs->ctx = ctx;
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ntvfs->ops = ntvfs_backend_byname(handlers[i], ctx->type);
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if (!ntvfs->ops) {
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DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n",
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handlers[i], ctx->type));
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return NT_STATUS_INTERNAL_ERROR;
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}
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ntvfs->depth = i;
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DLIST_ADD_END(ctx->modules, ntvfs);
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}
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if (!ctx->modules) {
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return NT_STATUS_INTERNAL_ERROR;
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}
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*_ctx = ctx;
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return NT_STATUS_OK;
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}
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/*
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adds the IPC$ share, needed for RPC calls
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*/
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static NTSTATUS ntvfs_add_ipc_share(struct loadparm_context *lp_ctx)
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{
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struct loadparm_service *ipc;
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if (lpcfg_service(lp_ctx, "IPC$")) {
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/* it has already been defined in smb.conf or elsewhere */
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return NT_STATUS_OK;
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}
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ipc = lpcfg_add_service(lp_ctx, NULL, "IPC$");
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NT_STATUS_HAVE_NO_MEMORY(ipc);
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lpcfg_do_service_parameter(lp_ctx, ipc, "comment", "IPC Service");
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lpcfg_do_service_parameter(lp_ctx, ipc, "path", "/dev/null");
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lpcfg_do_service_parameter(lp_ctx, ipc, "ntvfs handler", "default");
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lpcfg_do_service_parameter(lp_ctx, ipc, "browseable", "No");
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lpcfg_do_service_parameter(lp_ctx, ipc, "fstype", "IPC");
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return NT_STATUS_OK;
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}
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NTSTATUS ntvfs_init(struct loadparm_context *lp_ctx)
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{
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static bool initialized = false;
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#define _MODULE_PROTO(init) extern NTSTATUS init(void);
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STATIC_ntvfs_MODULES_PROTO;
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init_module_fn static_init[] = { STATIC_ntvfs_MODULES };
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init_module_fn *shared_init;
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if (initialized) return NT_STATUS_OK;
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initialized = true;
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shared_init = load_samba_modules(NULL, "ntvfs");
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run_init_functions(static_init);
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run_init_functions(shared_init);
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talloc_free(shared_init);
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ntvfs_add_ipc_share(lp_ctx);
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return NT_STATUS_OK;
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}
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