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Diffstat (limited to 'source4/ntvfs/ntvfs_base.c')
| -rw-r--r-- | source4/ntvfs/ntvfs_base.c | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/source4/ntvfs/ntvfs_base.c b/source4/ntvfs/ntvfs_base.c new file mode 100644 index 0000000..5c438bb --- /dev/null +++ b/source4/ntvfs/ntvfs_base.c @@ -0,0 +1,249 @@ +/* + Unix SMB/CIFS implementation. + NTVFS base code + + Copyright (C) Andrew Tridgell 2003 + Copyright (C) Stefan (metze) Metzmacher 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 3 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, see <http://www.gnu.org/licenses/>. +*/ +/* + this implements the core code for all NTVFS modules. Backends register themselves here. +*/ + +#include "includes.h" +#include "../lib/util/dlinklist.h" +#include "ntvfs/ntvfs.h" +#include "param/param.h" +#include "lib/util/samba_modules.h" + +/* the list of currently registered NTVFS backends, note that there + * can be more than one backend with the same name, as long as they + * have different typesx */ +static struct ntvfs_backend { + const struct ntvfs_ops *ops; +} *backends = NULL; +static int num_backends; + +/* + register a NTVFS backend. + + The 'name' can be later used by other backends to find the operations + structure for this backend. + + The 'type' is used to specify whether this is for a disk, printer or IPC$ share +*/ +NTSTATUS ntvfs_register(const struct ntvfs_ops *ops, + const struct ntvfs_critical_sizes *const sizes) +{ + struct ntvfs_ops *new_ops; + + if (ntvfs_interface_differs(sizes)) { + DEBUG(0, ("NTVFS backend '%s' for type %d " + "failed version check\n", + ops->name, (int)ops->type)); + return NT_STATUS_BAD_FUNCTION_TABLE; + } + + if (ntvfs_backend_byname(ops->name, ops->type) != NULL) { + /* its already registered! */ + DEBUG(0,("NTVFS backend '%s' for type %d already registered\n", + ops->name, (int)ops->type)); + return NT_STATUS_OBJECT_NAME_COLLISION; + } + + backends = realloc_p(backends, struct ntvfs_backend, num_backends+1); + if (!backends) { + smb_panic("out of memory in ntvfs_register"); + } + + new_ops = smb_xmemdup(ops, sizeof(*ops)); + new_ops->name = smb_xstrdup(ops->name); + + backends[num_backends].ops = new_ops; + + num_backends++; + + DEBUG(3,("NTVFS backend '%s' for type %d registered\n", + ops->name,ops->type)); + + return NT_STATUS_OK; +} + + +/* + return the operations structure for a named backend of the specified type +*/ +const struct ntvfs_ops *ntvfs_backend_byname(const char *name, enum ntvfs_type type) +{ + int i; + + for (i=0;i<num_backends;i++) { + if (backends[i].ops->type == type && + strcmp(backends[i].ops->name, name) == 0) { + return backends[i].ops; + } + } + + return NULL; +} + + +/* + return the NTVFS interface version, and the size of some critical types + This can be used by backends to either detect compilation errors, or provide + multiple implementations for different smbd compilation options in one module +*/ + +static const NTVFS_CURRENT_CRITICAL_SIZES(critical_sizes); + +const struct ntvfs_critical_sizes *ntvfs_interface_version(void) +{ + return &critical_sizes; +} + +bool ntvfs_interface_differs(const struct ntvfs_critical_sizes *const iface) +{ + /* The comparison would be easier with memcmp, but compiler-interset + * alignment padding is not guaranteed to be zeroed. + */ + +#define FIELD_DIFFERS(field) (iface->field != critical_sizes.field) + + if (FIELD_DIFFERS(interface_version)) + return true; + + if (FIELD_DIFFERS(sizeof_ntvfs_critical_sizes)) + return true; + + if (FIELD_DIFFERS(sizeof_ntvfs_context)) + return true; + + if (FIELD_DIFFERS(sizeof_ntvfs_module_context)) + return true; + + if (FIELD_DIFFERS(sizeof_ntvfs_ops)) + return true; + + if (FIELD_DIFFERS(sizeof_ntvfs_async_state)) + return true; + + if (FIELD_DIFFERS(sizeof_ntvfs_request)) + return true; + + /* Versions match. */ + return false; + +#undef FIELD_DIFFERS +} + +/* + initialise a connection structure to point at a NTVFS backend +*/ +NTSTATUS ntvfs_init_connection(TALLOC_CTX *mem_ctx, struct share_config *scfg, enum ntvfs_type type, + enum protocol_types protocol, + uint64_t ntvfs_client_caps, + struct tevent_context *ev, struct imessaging_context *msg, + struct loadparm_context *lp_ctx, + struct server_id server_id, struct ntvfs_context **_ctx) +{ + const char **handlers = share_string_list_option(mem_ctx, scfg, SHARE_NTVFS_HANDLER); + int i; + struct ntvfs_context *ctx; + + if (!handlers) { + return NT_STATUS_INTERNAL_ERROR; + } + + ctx = talloc_zero(mem_ctx, struct ntvfs_context); + NT_STATUS_HAVE_NO_MEMORY(ctx); + ctx->protocol = protocol; + ctx->client_caps = ntvfs_client_caps; + ctx->type = type; + ctx->config = talloc_steal(ctx, scfg); + ctx->event_ctx = ev; + ctx->msg_ctx = msg; + ctx->server_id = server_id; + ctx->lp_ctx = lp_ctx; + + for (i=0; handlers[i]; i++) { + struct ntvfs_module_context *ntvfs; + + ntvfs = talloc_zero(ctx, struct ntvfs_module_context); + NT_STATUS_HAVE_NO_MEMORY(ntvfs); + ntvfs->ctx = ctx; + ntvfs->ops = ntvfs_backend_byname(handlers[i], ctx->type); + if (!ntvfs->ops) { + DEBUG(1,("ntvfs_init_connection: failed to find backend=%s, type=%d\n", + handlers[i], ctx->type)); + return NT_STATUS_INTERNAL_ERROR; + } + ntvfs->depth = i; + DLIST_ADD_END(ctx->modules, ntvfs); + } + + if (!ctx->modules) { + return NT_STATUS_INTERNAL_ERROR; + } + + *_ctx = ctx; + return NT_STATUS_OK; +} + +/* + adds the IPC$ share, needed for RPC calls + */ +static NTSTATUS ntvfs_add_ipc_share(struct loadparm_context *lp_ctx) +{ + struct loadparm_service *ipc; + + if (lpcfg_service(lp_ctx, "IPC$")) { + /* it has already been defined in smb.conf or elsewhere */ + return NT_STATUS_OK; + } + + ipc = lpcfg_add_service(lp_ctx, NULL, "IPC$"); + NT_STATUS_HAVE_NO_MEMORY(ipc); + + lpcfg_do_service_parameter(lp_ctx, ipc, "comment", "IPC Service"); + lpcfg_do_service_parameter(lp_ctx, ipc, "path", "/dev/null"); + lpcfg_do_service_parameter(lp_ctx, ipc, "ntvfs handler", "default"); + lpcfg_do_service_parameter(lp_ctx, ipc, "browseable", "No"); + lpcfg_do_service_parameter(lp_ctx, ipc, "fstype", "IPC"); + + return NT_STATUS_OK; +} + +NTSTATUS ntvfs_init(struct loadparm_context *lp_ctx) +{ + static bool initialized = false; +#define _MODULE_PROTO(init) extern NTSTATUS init(TALLOC_CTX *); + STATIC_ntvfs_MODULES_PROTO; + init_module_fn static_init[] = { STATIC_ntvfs_MODULES }; + init_module_fn *shared_init; + + if (initialized) return NT_STATUS_OK; + initialized = true; + + shared_init = load_samba_modules(NULL, "ntvfs"); + + run_init_functions(NULL, static_init); + run_init_functions(NULL, shared_init); + + talloc_free(shared_init); + + ntvfs_add_ipc_share(lp_ctx); + + return NT_STATUS_OK; +} |