/*
   Unix SMB/CIFS implementation.
   smb2 lib
   Copyright (C) Volker Lendecke 2011

   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 "../libcli/smb/smb_common.h"
#include "../libcli/smb/smbXcli_base.h"

struct smb2cli_tcon_state {
	struct tevent_context *ev;
	struct smbXcli_conn *conn;
	uint32_t timeout_msec;
	struct smbXcli_session *session;
	struct smbXcli_tcon *tcon;
	uint8_t fixed[8];
	uint8_t dyn_pad[1];
};

static void smb2cli_tcon_done(struct tevent_req *subreq);

struct tevent_req *smb2cli_tcon_send(TALLOC_CTX *mem_ctx,
				     struct tevent_context *ev,
				     struct smbXcli_conn *conn,
				     uint32_t timeout_msec,
				     struct smbXcli_session *session,
				     struct smbXcli_tcon *tcon,
				     uint16_t flags,
				     const char *unc)
{
	struct tevent_req *req, *subreq;
	struct smb2cli_tcon_state *state;
	uint8_t *fixed;
	uint8_t *dyn;
	size_t dyn_len;
	uint32_t additional_flags = 0;
	uint32_t clear_flags = 0;

	req = tevent_req_create(mem_ctx, &state, struct smb2cli_tcon_state);
	if (req == NULL) {
		return NULL;
	}
	state->ev = ev;
	state->conn = conn;
	state->timeout_msec = timeout_msec;
	state->session = session;
	state->tcon = tcon;

	if (!convert_string_talloc(state, CH_UNIX, CH_UTF16,
				   unc, strlen(unc),
				   &dyn, &dyn_len)) {
		tevent_req_oom(req);
		return tevent_req_post(req, ev);
	}

	if (strlen(unc) == 0) {
		TALLOC_FREE(dyn);
		dyn_len = 0;
	}

	fixed = state->fixed;
	SSVAL(fixed, 0, 9);
	if (smbXcli_conn_protocol(conn) >= PROTOCOL_SMB3_10) {
		SSVAL(fixed, 2, flags);
	} else {
		SSVAL(fixed, 2, 0); /* Reserved */
	}
	SSVAL(fixed, 4, SMB2_HDR_BODY + 8);
	SSVAL(fixed, 6, dyn_len);

	if (dyn_len == 0) {
		dyn = state->dyn_pad;
		dyn_len = sizeof(state->dyn_pad);
	}

	if (smbXcli_session_is_authenticated(state->session)) {
		additional_flags |= SMB2_HDR_FLAG_SIGNED;
	}

	subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_TCON,
				  additional_flags, clear_flags,
				  timeout_msec,
				  NULL, /* tcon */
				  session,
				  state->fixed, sizeof(state->fixed),
				  dyn, dyn_len,
				  0); /* max_dyn_len */
	if (tevent_req_nomem(subreq, req)) {
		return tevent_req_post(req, ev);
	}
	tevent_req_set_callback(subreq, smb2cli_tcon_done, req);

	return req;
}

static void smb2cli_tcon_validate(struct tevent_req *subreq);

static void smb2cli_tcon_done(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct smb2cli_tcon_state *state = tevent_req_data(
		req, struct smb2cli_tcon_state);
	NTSTATUS status;
	struct iovec *iov;
	uint8_t *body;
	uint32_t tcon_id;
	uint8_t share_type;
	uint32_t share_flags;
	uint32_t share_capabilities;
	uint32_t maximal_access;
	static const struct smb2cli_req_expected_response expected[] = {
	{
		.status = NT_STATUS_OK,
		.body_size = 0x10
	}
	};

	status = smb2cli_req_recv(subreq, state, &iov,
				  expected, ARRAY_SIZE(expected));
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		tevent_req_nterror(req, status);
		return;
	}

	tcon_id = IVAL(iov[0].iov_base, SMB2_HDR_TID);

	body = (uint8_t *)iov[1].iov_base;
	share_type		= CVAL(body, 0x02);
	share_flags		= IVAL(body, 0x04);
	share_capabilities	= IVAL(body, 0x08);
	maximal_access		= IVAL(body, 0x0C);

	smb2cli_tcon_set_values(state->tcon,
				state->session,
				tcon_id,
				share_type,
				share_flags,
				share_capabilities,
				maximal_access);

	if (!smbXcli_session_is_authenticated(state->session)) {
		tevent_req_done(req);
		return;
	}

	if (smbXcli_conn_protocol(state->conn) >= PROTOCOL_SMB3_10) {
		tevent_req_done(req);
		return;
	}

	subreq = smb2cli_validate_negotiate_info_send(state, state->ev,
						      state->conn,
						      state->timeout_msec,
						      state->session,
						      state->tcon);
	if (tevent_req_nomem(subreq, req)) {
		return;
	}
	tevent_req_set_callback(subreq, smb2cli_tcon_validate, req);
}

static void smb2cli_tcon_validate(struct tevent_req *subreq)
{
	struct tevent_req *req = tevent_req_callback_data(
		subreq, struct tevent_req);
	struct smb2cli_tcon_state *state = tevent_req_data(
		req, struct smb2cli_tcon_state);
	NTSTATUS status;

	status = smb2cli_validate_negotiate_info_recv(subreq);
	TALLOC_FREE(subreq);
	if (!NT_STATUS_IS_OK(status)) {
		smb2cli_tcon_set_values(state->tcon, NULL,
					UINT32_MAX, 0, 0, 0, 0);
		tevent_req_nterror(req, status);
		return;
	}

	tevent_req_done(req);
}

NTSTATUS smb2cli_tcon_recv(struct tevent_req *req)
{
	return tevent_req_simple_recv_ntstatus(req);
}

NTSTATUS smb2cli_tcon(struct smbXcli_conn *conn,
		      uint32_t timeout_msec,
		      struct smbXcli_session *session,
		      struct smbXcli_tcon *tcon,
		      uint16_t flags,
		      const char *unc)
{
	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_tcon_send(frame, ev, conn,
				timeout_msec, session, tcon,
				flags, unc);
	if (req == NULL) {
		goto fail;
	}
	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
		goto fail;
	}
	status = smb2cli_tcon_recv(req);
 fail:
	TALLOC_FREE(frame);
	return status;
}

struct smb2cli_tdis_state {
	struct smbXcli_tcon *tcon;
	uint8_t fixed[4];
};

static void smb2cli_tdis_done(struct tevent_req *subreq);

struct tevent_req *smb2cli_tdis_send(TALLOC_CTX *mem_ctx,
				     struct tevent_context *ev,
				     struct smbXcli_conn *conn,
				     uint32_t timeout_msec,
				     struct smbXcli_session *session,
				     struct smbXcli_tcon *tcon)
{
	struct tevent_req *req, *subreq;
	struct smb2cli_tdis_state *state;

	req = tevent_req_create(mem_ctx, &state,
				struct smb2cli_tdis_state);
	if (req == NULL) {
		return NULL;
	}
	state->tcon = tcon;

	SSVAL(state->fixed, 0, 4);

	subreq = smb2cli_req_send(state, ev, conn, SMB2_OP_TDIS,
				  0, 0, /* flags */
				  timeout_msec,
				  tcon, 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_tdis_done, req);
	return req;
}

static void smb2cli_tdis_done(struct tevent_req *subreq)
{
	struct tevent_req *req =
		tevent_req_callback_data(subreq,
		struct tevent_req);
	struct smb2cli_tdis_state *state =
		tevent_req_data(req,
		struct smb2cli_tdis_state);
	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;
	}
	smb2cli_tcon_set_values(state->tcon, NULL,
				UINT32_MAX, 0, 0, 0, 0);
	tevent_req_done(req);
}

NTSTATUS smb2cli_tdis_recv(struct tevent_req *req)
{
	return tevent_req_simple_recv_ntstatus(req);
}

NTSTATUS smb2cli_tdis(struct smbXcli_conn *conn,
		      uint32_t timeout_msec,
		      struct smbXcli_session *session,
		      struct smbXcli_tcon *tcon)
{
	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_tdis_send(frame, ev, conn,
				timeout_msec, session, tcon);
	if (req == NULL) {
		goto fail;
	}
	if (!tevent_req_poll_ntstatus(req, ev, &status)) {
		goto fail;
	}
	status = smb2cli_tdis_recv(req);
 fail:
	TALLOC_FREE(frame);
	return status;
}
