Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 197 insertions, 0 deletions

diff --git a/source4/ntvfs/ntvfs_util.c b/source4/ntvfs/ntvfs_util.c
new file mode 100644
index 0000000..2888ef4
--- /dev/null
+++ b/source4/ntvfs/ntvfs_util.c
@@ -0,0 +1,197 @@
+/* 
+   Unix SMB/CIFS implementation.
+   NTVFS utility code
+   Copyright (C) Stefan 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 common utility functions that many NTVFS backends may wish to use
+*/
+
+#include "includes.h"
+#include "../lib/util/dlinklist.h"
+#include "ntvfs/ntvfs.h"
+
+
+struct ntvfs_request *ntvfs_request_create(struct ntvfs_context *ctx, TALLOC_CTX *mem_ctx,
+						    struct auth_session_info *session_info,
+						    uint16_t smbpid,
+						    struct timeval request_time,
+						    void *private_data,
+						    void (*send_fn)(struct ntvfs_request *),
+						    uint32_t state)
+{
+	struct ntvfs_request *req;
+	struct ntvfs_async_state *async;
+
+	req = talloc(mem_ctx, struct ntvfs_request);
+	if (!req) return NULL;
+	req->ctx			= ctx;
+	req->async_states		= NULL;
+	req->session_info		= session_info;
+	req->smbpid			= smbpid;
+	req->client_caps		= ctx->client_caps;
+	req->statistics.request_time	= request_time;
+
+	async = talloc(req, struct ntvfs_async_state);
+	if (!async) goto failed;
+
+	async->state		= state;
+	async->private_data	= private_data;
+	async->send_fn		= send_fn;
+	async->status		= NT_STATUS_INTERNAL_ERROR;
+	async->ntvfs		= NULL;
+
+	DLIST_ADD(req->async_states, async);
+
+	return req;
+failed:
+	talloc_free(req);
+	return NULL;
+}
+
+NTSTATUS ntvfs_async_state_push(struct ntvfs_module_context *ntvfs,
+					 struct ntvfs_request *req,
+					 void *private_data,
+					 void (*send_fn)(struct ntvfs_request *))
+{
+	struct ntvfs_async_state *async;
+
+	async = talloc(req, struct ntvfs_async_state);
+	NT_STATUS_HAVE_NO_MEMORY(async);
+
+	async->state		= req->async_states->state;
+	async->private_data	= private_data;
+	async->send_fn		= send_fn;
+	async->status		= NT_STATUS_INTERNAL_ERROR;
+
+	async->ntvfs		= ntvfs;
+
+	DLIST_ADD(req->async_states, async);
+
+	return NT_STATUS_OK;
+}
+
+void ntvfs_async_state_pop(struct ntvfs_request *req)
+{
+	struct ntvfs_async_state *async;
+
+	async = req->async_states;
+
+	DLIST_REMOVE(req->async_states, async);
+
+	req->async_states->state	= async->state;
+	req->async_states->status	= async->status;
+
+	talloc_free(async);
+}
+
+NTSTATUS ntvfs_handle_new(struct ntvfs_module_context *ntvfs,
+				   struct ntvfs_request *req,
+				   struct ntvfs_handle **h)
+{
+	if (!ntvfs->ctx->handles.create_new) {
+		return NT_STATUS_NOT_IMPLEMENTED;
+	}
+	return ntvfs->ctx->handles.create_new(ntvfs->ctx->handles.private_data, req, h);
+}
+
+NTSTATUS ntvfs_handle_set_backend_data(struct ntvfs_handle *h,
+						struct ntvfs_module_context *ntvfs,
+						TALLOC_CTX *private_data)
+{
+	struct ntvfs_handle_data *d;
+	bool first_time = h->backend_data?false:true;
+
+	for (d=h->backend_data; d; d = d->next) {
+		if (d->owner != ntvfs) continue;
+		d->private_data = talloc_steal(d, private_data);
+		return NT_STATUS_OK;
+	}
+
+	d = talloc(h, struct ntvfs_handle_data);
+	NT_STATUS_HAVE_NO_MEMORY(d);
+	d->owner = ntvfs;
+	d->private_data = talloc_steal(d, private_data);
+
+	DLIST_ADD(h->backend_data, d);
+
+	if (first_time) {
+		NTSTATUS status;
+		status = h->ctx->handles.make_valid(h->ctx->handles.private_data, h);
+		NT_STATUS_NOT_OK_RETURN(status);
+	}
+
+	return NT_STATUS_OK;
+}
+
+void *ntvfs_handle_get_backend_data(struct ntvfs_handle *h,
+					     struct ntvfs_module_context *ntvfs)
+{
+	struct ntvfs_handle_data *d;
+
+	for (d=h->backend_data; d; d = d->next) {
+		if (d->owner != ntvfs) continue;
+		return d->private_data;
+	}
+
+	return NULL;
+}
+
+void ntvfs_handle_remove_backend_data(struct ntvfs_handle *h,
+					       struct ntvfs_module_context *ntvfs)
+{
+	struct ntvfs_handle_data *d,*n;
+
+	for (d=h->backend_data; d; d = n) {
+		n = d->next;
+		if (d->owner != ntvfs) continue;
+		DLIST_REMOVE(h->backend_data, d);
+		talloc_free(d);
+		d = NULL;
+	}
+
+	if (h->backend_data) return;
+
+	/* if there's no backend_data anymore, destroy the handle */
+	h->ctx->handles.destroy(h->ctx->handles.private_data, h);
+}
+
+struct ntvfs_handle *ntvfs_handle_search_by_wire_key(struct ntvfs_module_context *ntvfs,
+							      struct ntvfs_request *req,
+							      const DATA_BLOB *key)
+{
+	if (!ntvfs->ctx->handles.search_by_wire_key) {
+		return NULL;
+	}
+	return ntvfs->ctx->handles.search_by_wire_key(ntvfs->ctx->handles.private_data, req, key);
+}
+
+NTSTATUS ntvfs_set_handle_callbacks(struct ntvfs_context *ntvfs,
+					     NTSTATUS (*create_new)(void *private_data, struct ntvfs_request *req, struct ntvfs_handle **h),
+					     NTSTATUS (*make_valid)(void *private_data, struct ntvfs_handle *h),
+					     void (*destroy)(void *private_data, struct ntvfs_handle *h),
+					     struct ntvfs_handle *(*search_by_wire_key)(void *private_data, struct ntvfs_request *req, const DATA_BLOB *key),
+					     DATA_BLOB (*get_wire_key)(void *private_data, struct ntvfs_handle *handle, TALLOC_CTX *mem_ctx),
+					     void *private_data)
+{
+	ntvfs->handles.create_new		= create_new;
+	ntvfs->handles.make_valid		= make_valid;
+	ntvfs->handles.destroy			= destroy;
+	ntvfs->handles.search_by_wire_key	= search_by_wire_key;
+	ntvfs->handles.get_wire_key		= get_wire_key;
+	ntvfs->handles.private_data		= private_data;
+	return NT_STATUS_OK;
+}