clitransport.c

来自「samba最新软件」· C语言 代码 · 共 667 行 · 第 1/2 页

	if (transport->socket->event.te != NULL) {
		talloc_free(transport->socket->event.te);
	}

	transport->socket->event.te = event_add_timed(transport->socket->event.ctx, 
						      transport,
						      timeval_current_ofs(0, period),
						      idle_handler, transport);
}

/*
  we have a full request in our receive buffer - match it to a pending request
  and process
 */
static NTSTATUS smbcli_transport_finish_recv(void *private, DATA_BLOB blob)
{
	struct smbcli_transport *transport = talloc_get_type(private, 
							     struct smbcli_transport);
	uint8_t *buffer, *hdr, *vwv;
	int len;
	uint16_t wct=0, mid = 0, op = 0;
	struct smbcli_request *req = NULL;

	buffer = blob.data;
	len = blob.length;

	hdr = buffer+NBT_HDR_SIZE;
	vwv = hdr + HDR_VWV;

	/* see if it could be an oplock break request */
	if (smbcli_handle_oplock_break(transport, len, hdr, vwv)) {
		talloc_free(buffer);
		return NT_STATUS_OK;
	}

	/* at this point we need to check for a readbraw reply, as
	   these can be any length */
	if (transport->readbraw_pending) {
		transport->readbraw_pending = 0;

		/* it must match the first entry in the pending queue
		   as the client is not allowed to have outstanding
		   readbraw requests */
		req = transport->pending_recv;
		if (!req) goto error;

		req->in.buffer = buffer;
		talloc_steal(req, buffer);
		req->in.size = len;
		req->in.allocated = req->in.size;
		goto async;
	}

	if (len >= MIN_SMB_SIZE) {
		/* extract the mid for matching to pending requests */
		mid = SVAL(hdr, HDR_MID);
		wct = CVAL(hdr, HDR_WCT);
		op  = CVAL(hdr, HDR_COM);
	}

	/* match the incoming request against the list of pending requests */
	for (req=transport->pending_recv; req; req=req->next) {
		if (req->mid == mid) break;
	}

	/* see if it's a ntcancel reply for the current MID */
	req = smbcli_handle_ntcancel_reply(req, len, hdr);

	if (!req) {
		DEBUG(1,("Discarding unmatched reply with mid %d op %d\n", mid, op));
		goto error;
	}

	/* fill in the 'in' portion of the matching request */
	req->in.buffer = buffer;
	talloc_steal(req, buffer);
	req->in.size = len;
	req->in.allocated = req->in.size;

	/* handle NBT session replies */
	if (req->in.size >= 4 && req->in.buffer[0] != 0) {
		req->status = NT_STATUS_OK;
		goto async;
	}

	/* handle non-SMB replies */
	if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE) {
		req->state = SMBCLI_REQUEST_ERROR;
		goto error;
	}

	if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct)) {
		DEBUG(2,("bad reply size for mid %d\n", mid));
		req->status = NT_STATUS_UNSUCCESSFUL;
		req->state = SMBCLI_REQUEST_ERROR;
		goto error;
	}

	req->in.hdr = hdr;
	req->in.vwv = vwv;
	req->in.wct = wct;
	if (req->in.size >= NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct)) {
		req->in.data = req->in.vwv + VWV(wct) + 2;
		req->in.data_size = SVAL(req->in.vwv, VWV(wct));
		if (req->in.size < NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct) + req->in.data_size) {
			DEBUG(3,("bad data size for mid %d\n", mid));
			/* blergh - w2k3 gives a bogus data size values in some
			   openX replies */
			req->in.data_size = req->in.size - (NBT_HDR_SIZE + MIN_SMB_SIZE + VWV(wct));
		}
	}
	req->in.ptr = req->in.data;
	req->flags2 = SVAL(req->in.hdr, HDR_FLG2);

	smb_setup_bufinfo(req);

	if (!(req->flags2 & FLAGS2_32_BIT_ERROR_CODES)) {
		int class = CVAL(req->in.hdr,HDR_RCLS);
		int code = SVAL(req->in.hdr,HDR_ERR);
		if (class == 0 && code == 0) {
			transport->error.e.nt_status = NT_STATUS_OK;
		} else {
			transport->error.e.nt_status = NT_STATUS_DOS(class, code);
		}
	} else {
		transport->error.e.nt_status = NT_STATUS(IVAL(req->in.hdr, HDR_RCLS));
	}

	req->status = transport->error.e.nt_status;
	if (NT_STATUS_IS_OK(req->status)) {
		transport->error.etype = ETYPE_NONE;
	} else {
		transport->error.etype = ETYPE_SMB;
	}

	if (!smbcli_request_check_sign_mac(req)) {
		transport->error.etype = ETYPE_SOCKET;
		transport->error.e.socket_error = SOCKET_READ_BAD_SIG;
		req->state = SMBCLI_REQUEST_ERROR;
		req->status = NT_STATUS_ACCESS_DENIED;
		goto error;
	};

async:
	/* if this request has an async handler then call that to
	   notify that the reply has been received. This might destroy
	   the request so it must happen last */
	DLIST_REMOVE(transport->pending_recv, req);
	req->state = SMBCLI_REQUEST_DONE;
	if (req->async.fn) {
		req->async.fn(req);
	}
	return NT_STATUS_OK;

error:
	if (req) {
		DLIST_REMOVE(transport->pending_recv, req);
		req->state = SMBCLI_REQUEST_ERROR;
		if (req->async.fn) {
			req->async.fn(req);
		}
	} else {
		talloc_free(buffer);
	}
	return NT_STATUS_OK;
}

/*
  process some read/write requests that are pending
  return false if the socket is dead
*/
_PUBLIC_ bool smbcli_transport_process(struct smbcli_transport *transport)
{
	NTSTATUS status;
	size_t npending;

	packet_queue_run(transport->packet);
	if (transport->socket->sock == NULL) {
		return false;
	}

	status = socket_pending(transport->socket->sock, &npending);
	if (NT_STATUS_IS_OK(status) && npending > 0) {
		packet_recv(transport->packet);
	}
	if (transport->socket->sock == NULL) {
		return false;
	}
	return true;
}

/*
  handle timeouts of individual smb requests
*/
static void smbcli_timeout_handler(struct event_context *ev, struct timed_event *te, 
				   struct timeval t, void *private)
{
	struct smbcli_request *req = talloc_get_type(private, struct smbcli_request);

	if (req->state == SMBCLI_REQUEST_RECV) {
		DLIST_REMOVE(req->transport->pending_recv, req);
	}
	req->status = NT_STATUS_IO_TIMEOUT;
	req->state = SMBCLI_REQUEST_ERROR;
	if (req->async.fn) {
		req->async.fn(req);
	}
}


/*
  destroy a request
*/
static int smbcli_request_destructor(struct smbcli_request *req)
{
	if (req->state == SMBCLI_REQUEST_RECV) {
		DLIST_REMOVE(req->transport->pending_recv, req);
	}
	return 0;
}


/*
  put a request into the send queue
*/
void smbcli_transport_send(struct smbcli_request *req)
{
	DATA_BLOB blob;
	NTSTATUS status;

	/* check if the transport is dead */
	if (req->transport->socket->sock == NULL) {
		req->state = SMBCLI_REQUEST_ERROR;
		req->status = NT_STATUS_NET_WRITE_FAULT;
		return;
	}

	blob = data_blob_const(req->out.buffer, req->out.size);
	status = packet_send(req->transport->packet, blob);
	if (!NT_STATUS_IS_OK(status)) {
		req->state = SMBCLI_REQUEST_ERROR;
		req->status = status;
		return;
	}

	if (req->one_way_request) {
		req->state = SMBCLI_REQUEST_DONE;
		smbcli_request_destroy(req);
		return;
	}

	req->state = SMBCLI_REQUEST_RECV;
	DLIST_ADD(req->transport->pending_recv, req);

	/* add a timeout */
	if (req->transport->options.request_timeout) {
		event_add_timed(req->transport->socket->event.ctx, req, 
				timeval_current_ofs(req->transport->options.request_timeout, 0), 
				smbcli_timeout_handler, req);
	}

	talloc_set_destructor(req, smbcli_request_destructor);
}


/****************************************************************************
 Send an SMBecho (async send)
*****************************************************************************/
_PUBLIC_ struct smbcli_request *smb_raw_echo_send(struct smbcli_transport *transport,
					 struct smb_echo *p)
{
	struct smbcli_request *req;

	req = smbcli_request_setup_transport(transport, SMBecho, 1, p->in.size);
	if (!req) return NULL;

	SSVAL(req->out.vwv, VWV(0), p->in.repeat_count);

	memcpy(req->out.data, p->in.data, p->in.size);

	ZERO_STRUCT(p->out);

	if (!smbcli_request_send(req)) {
		smbcli_request_destroy(req);
		return NULL;
	}

	return req;
}

/****************************************************************************
 raw echo interface (async recv)
****************************************************************************/
NTSTATUS smb_raw_echo_recv(struct smbcli_request *req, TALLOC_CTX *mem_ctx,
			   struct smb_echo *p)
{
	if (!smbcli_request_receive(req) ||
	    smbcli_request_is_error(req)) {
		goto failed;
	}

	SMBCLI_CHECK_WCT(req, 1);
	p->out.count++;
	p->out.sequence_number = SVAL(req->in.vwv, VWV(0));
	p->out.size = req->in.data_size;
	talloc_free(p->out.data);
	p->out.data = talloc_array(mem_ctx, uint8_t, p->out.size);
	NT_STATUS_HAVE_NO_MEMORY(p->out.data);

	if (!smbcli_raw_pull_data(&req->in.bufinfo, req->in.data, p->out.size, p->out.data)) {
		req->status = NT_STATUS_BUFFER_TOO_SMALL;
	}

	if (p->out.count == p->in.repeat_count) {
		return smbcli_request_destroy(req);
	}

	return NT_STATUS_OK;

failed:
	return smbcli_request_destroy(req);
}

/****************************************************************************
 Send a echo (sync interface)
*****************************************************************************/
NTSTATUS smb_raw_echo(struct smbcli_transport *transport, struct smb_echo *p)
{
	struct smbcli_request *req = smb_raw_echo_send(transport, p);
	return smbcli_request_simple_recv(req);
}