1 files changed, 122 insertions, 0 deletions
diff --git a/libcli/smb/smb2cli_echo.c b/libcli/smb/smb2cli_echo.c
new file mode 100644
index 0000000..39c592c
--- /dev/null
+++ b/libcli/smb/smb2cli_echo.c
@@ -0,0 +1,122 @@
+/*
+   Unix SMB/CIFS implementation.
+   smb2 lib
+   Copyright (C) Stefan Metzmacher 2012
+
+   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/>.
+*/
+
+#include "includes.h"
+#include "system/network.h"
+#include "lib/util/tevent_ntstatus.h"
+#include "smb_common.h"
+#include "smbXcli_base.h"
+
+struct smb2cli_echo_state {
+	uint8_t fixed[0x4];
+};
+
+static void smb2cli_echo_done(struct tevent_req *subreq);
+
+struct tevent_req *smb2cli_echo_send(TALLOC_CTX *mem_ctx,
+				     struct tevent_context *ev,
+				     struct smbXcli_conn *conn,
+				     uint32_t timeout_msec)
+{
+	struct tevent_req *req, *subreq;
+	struct smb2cli_echo_state *state;
+	uint8_t *fixed;
+
+	req = tevent_req_create(mem_ctx, &state,
+				struct smb2cli_echo_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	fixed = state->fixed;
+	SSVAL(fixed, 0, 4);
+	SSVAL(fixed, 2, 0);
+
+	subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_KEEPALIVE,
+				  0, 0, /* flags */
+				  timeout_msec,
+				  NULL, /* tcon */
+				  NULL, /* session */
+				  state->fixed, sizeof(state->fixed),
+				  NULL, 0, /* dyn* */
+				  0); /* max_dyn_len */
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, smb2cli_echo_done, req);
+	return req;
+}
+
+static void smb2cli_echo_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req =
+		tevent_req_callback_data(subreq,
+		struct tevent_req);
+	NTSTATUS status;
+	static const struct smb2cli_req_expected_response expected[] = {
+	{
+		.status = NT_STATUS_OK,
+		.body_size = 0x04
+	}
+	};
+
+	status = smb2cli_req_recv(subreq, NULL, NULL,
+				  expected, ARRAY_SIZE(expected));
+	TALLOC_FREE(subreq);
+	if (tevent_req_nterror(req, status)) {
+		return;
+	}
+	tevent_req_done(req);
+}
+
+NTSTATUS smb2cli_echo_recv(struct tevent_req *req)
+{
+	return tevent_req_simple_recv_ntstatus(req);
+}
+
+NTSTATUS smb2cli_echo(struct smbXcli_conn *conn,
+		      uint32_t timeout_msec)
+{
+	TALLOC_CTX *frame = talloc_stackframe();
+	struct tevent_context *ev;
+	struct tevent_req *req;
+	NTSTATUS status = NT_STATUS_NO_MEMORY;
+
+	if (smbXcli_conn_has_async_calls(conn)) {
+		/*
+		 * Can't use sync call while an async call is in flight
+		 */
+		status = NT_STATUS_INVALID_PARAMETER;
+		goto fail;
+	}
+	ev = samba_tevent_context_init(frame);
+	if (ev == NULL) {
+		goto fail;
+	}
+	req = smb2cli_echo_send(frame, ev, conn, timeout_msec);
+	if (req == NULL) {
+		goto fail;
+	}
+	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
+		goto fail;
+	}
+	status = smb2cli_echo_recv(req);
+ fail:
+	TALLOC_FREE(frame);
+	return status;
+}