int rpc_client_on_read_event(rdpRpc* rpc)
{
int position;
int status = -1;
rpcconn_common_hdr_t* header;
if (!rpc->client->RecvFrag)
rpc->client->RecvFrag = rpc_client_fragment_pool_take(rpc);
position = Stream_GetPosition(rpc->client->RecvFrag);
if (Stream_GetPosition(rpc->client->RecvFrag) < RPC_COMMON_FIELDS_LENGTH)
{
status = rpc_out_read(rpc, Stream_Pointer(rpc->client->RecvFrag),
RPC_COMMON_FIELDS_LENGTH - Stream_GetPosition(rpc->client->RecvFrag));
if (status < 0)
{
fprintf(stderr, "rpc_client_frag_read: error reading header\n");
return -1;
}
Stream_Seek(rpc->client->RecvFrag, status);
}
if (Stream_GetPosition(rpc->client->RecvFrag) >= RPC_COMMON_FIELDS_LENGTH)
{
header = (rpcconn_common_hdr_t*) Stream_Buffer(rpc->client->RecvFrag);
if (header->frag_length > rpc->max_recv_frag)
{
fprintf(stderr, "rpc_client_frag_read: invalid fragment size: %d (max: %d)\n",
header->frag_length, rpc->max_recv_frag);
winpr_HexDump(Stream_Buffer(rpc->client->RecvFrag), Stream_GetPosition(rpc->client->RecvFrag));
return -1;
}
if (Stream_GetPosition(rpc->client->RecvFrag) < header->frag_length)
{
status = rpc_out_read(rpc, Stream_Pointer(rpc->client->RecvFrag),
header->frag_length - Stream_GetPosition(rpc->client->RecvFrag));
if (status < 0)
{
fprintf(stderr, "rpc_client_frag_read: error reading fragment body\n");
return -1;
}
Stream_Seek(rpc->client->RecvFrag, status);
}
}
else
{
return status;
}
if (status < 0)
return -1;
status = Stream_GetPosition(rpc->client->RecvFrag) - position;
if (Stream_GetPosition(rpc->client->RecvFrag) >= header->frag_length)
{
/* complete fragment received */
Stream_Length(rpc->client->RecvFrag) = Stream_GetPosition(rpc->client->RecvFrag);
Stream_SetPosition(rpc->client->RecvFrag, 0);
Queue_Enqueue(rpc->client->FragmentQueue, rpc->client->RecvFrag);
rpc->client->RecvFrag = NULL;
rpc_client_on_fragment_received_event(rpc);
}
return status;
}
BOOL rts_connect(rdpRpc* rpc)
{
RPC_PDU* pdu;
rpcconn_rts_hdr_t* rts;
HttpResponse* http_response;
freerdp* instance = (freerdp*) rpc->settings->instance;
rdpContext* context = instance->context;
/**
* Connection Opening
*
* When opening a virtual connection to the server, an implementation of this protocol MUST perform
* the following sequence of steps:
*
* 1. Send an IN channel request as specified in section 2.1.2.1.1, containing the connection timeout,
* ResourceType UUID, and Session UUID values, if any, supplied by the higher-layer protocol or application.
*
* 2. Send an OUT channel request as specified in section 2.1.2.1.2.
*
* 3. Send a CONN/A1 RTS PDU as specified in section 2.2.4.2
*
* 4. Send a CONN/B1 RTS PDU as specified in section 2.2.4.5
*
* 5. Wait for the connection establishment protocol sequence as specified in 3.2.1.5.3.1 to complete
*
* An implementation MAY execute steps 1 and 2 in parallel. An implementation SHOULD execute steps
* 3 and 4 in parallel. An implementation MUST execute step 3 after completion of step 1 and execute
* step 4 after completion of step 2.
*
*/
rpc->VirtualConnection->State = VIRTUAL_CONNECTION_STATE_INITIAL;
WLog_DBG(TAG, "VIRTUAL_CONNECTION_STATE_INITIAL");
rpc->client->SynchronousSend = TRUE;
rpc->client->SynchronousReceive = TRUE;
if (!rpc_ntlm_http_out_connect(rpc))
{
WLog_ERR(TAG, "rpc_out_connect_http error!");
return FALSE;
}
if (rts_send_CONN_A1_pdu(rpc) != 0)
{
WLog_ERR(TAG, "rpc_send_CONN_A1_pdu error!");
return FALSE;
}
if (!rpc_ntlm_http_in_connect(rpc))
{
WLog_ERR(TAG, "rpc_in_connect_http error!");
return FALSE;
}
if (rts_send_CONN_B1_pdu(rpc) < 0)
{
WLog_ERR(TAG, "rpc_send_CONN_B1_pdu error!");
return FALSE;
}
rpc->VirtualConnection->State = VIRTUAL_CONNECTION_STATE_OUT_CHANNEL_WAIT;
WLog_DBG(TAG, "VIRTUAL_CONNECTION_STATE_OUT_CHANNEL_WAIT");
/**
* Receive OUT Channel Response
*
* A client implementation MUST NOT accept the OUT channel HTTP response in any state other than
* Out Channel Wait. If received in any other state, this HTTP response is a protocol error. Therefore,
* the client MUST consider the virtual connection opening a failure and indicate this to higher layers
* in an implementation-specific way. The Microsoft Windows® implementation returns
* RPC_S_PROTOCOL_ERROR, as specified in [MS-ERREF], to higher-layer protocols.
*
* If this HTTP response is received in Out Channel Wait state, the client MUST process the fields of
* this response as defined in this section.
*
* First, the client MUST determine whether the response indicates a success or a failure. If the status
* code is set to 200, the client MUST interpret this as a success, and it MUST do the following:
*
* 1. Ignore the values of all other header fields.
*
* 2. Transition to Wait_A3W state.
*
* 3. Wait for network events.
*
* 4. Skip the rest of the processing in this section.
*
* If the status code is not set to 200, the client MUST interpret this as a failure and follow the same
* processing rules as specified in section 3.2.2.5.6.
*
*/
http_response = http_response_recv(rpc->TlsOut);
if (!http_response)
{
WLog_ERR(TAG, "unable to retrieve OUT Channel Response!");
return FALSE;
}
if (http_response->StatusCode != HTTP_STATUS_OK)
{
WLog_ERR(TAG, "error! Status Code: %d", http_response->StatusCode);
http_response_print(http_response);
http_response_free(http_response);
if (http_response->StatusCode == HTTP_STATUS_DENIED)
{
if (!connectErrorCode)
{
connectErrorCode = AUTHENTICATIONERROR;
}
if (!freerdp_get_last_error(context))
{
freerdp_set_last_error(context, FREERDP_ERROR_AUTHENTICATION_FAILED);
}
}
return FALSE;
}
if (http_response->bodyLen)
{
/* inject bytes we have read in the body as a received packet for the RPC client */
rpc->client->RecvFrag = rpc_client_fragment_pool_take(rpc);
Stream_EnsureCapacity(rpc->client->RecvFrag, http_response->bodyLen);
CopyMemory(rpc->client->RecvFrag, http_response->BodyContent, http_response->bodyLen);
}
//http_response_print(http_response);
http_response_free(http_response);
rpc->VirtualConnection->State = VIRTUAL_CONNECTION_STATE_WAIT_A3W;
WLog_DBG(TAG, "VIRTUAL_CONNECTION_STATE_WAIT_A3W");
/**
* Receive CONN_A3 RTS PDU
*
* A client implementation MUST NOT accept the CONN/A3 RTS PDU in any state other than
* Wait_A3W. If received in any other state, this PDU is a protocol error and the client
* MUST consider the virtual connection opening a failure and indicate this to higher
* layers in an implementation-specific way.
*
* Set the ConnectionTimeout in the Ping Originator of the Client's IN Channel to the
* ConnectionTimeout in the CONN/A3 PDU.
*
* If this RTS PDU is received in Wait_A3W state, the client MUST transition the state
* machine to Wait_C2 state and wait for network events.
*
*/
rpc_client_start(rpc);
pdu = rpc_recv_dequeue_pdu(rpc);
if (!pdu)
return FALSE;
rts = (rpcconn_rts_hdr_t*) Stream_Buffer(pdu->s);
if (!rts_match_pdu_signature(rpc, &RTS_PDU_CONN_A3_SIGNATURE, rts))
{
WLog_ERR(TAG, "unexpected RTS PDU: Expected CONN/A3");
return FALSE;
}
rts_recv_CONN_A3_pdu(rpc, Stream_Buffer(pdu->s), Stream_Length(pdu->s));
rpc_client_receive_pool_return(rpc, pdu);
rpc->VirtualConnection->State = VIRTUAL_CONNECTION_STATE_WAIT_C2;
WLog_DBG(TAG, "VIRTUAL_CONNECTION_STATE_WAIT_C2");
/**
* Receive CONN_C2 RTS PDU
*
* A client implementation MUST NOT accept the CONN/C2 RTS PDU in any state other than Wait_C2.
* If received in any other state, this PDU is a protocol error and the client MUST consider the virtual
* connection opening a failure and indicate this to higher layers in an implementation-specific way.
*
* If this RTS PDU is received in Wait_C2 state, the client implementation MUST do the following:
*
* 1. Transition the state machine to opened state.
*
* 2. Set the connection time-out protocol variable to the value of the ConnectionTimeout field from
* the CONN/C2 RTS PDU.
*
* 3. Set the PeerReceiveWindow value in the SendingChannel of the Client IN Channel to the
* ReceiveWindowSize value in the CONN/C2 PDU.
*
* 4. Indicate to higher-layer protocols that the virtual connection opening is a success.
*
*/
pdu = rpc_recv_dequeue_pdu(rpc);
if (!pdu)
return FALSE;
rts = (rpcconn_rts_hdr_t*) Stream_Buffer(pdu->s);
if (!rts_match_pdu_signature(rpc, &RTS_PDU_CONN_C2_SIGNATURE, rts))
{
WLog_ERR(TAG, "unexpected RTS PDU: Expected CONN/C2");
return FALSE;
}
rts_recv_CONN_C2_pdu(rpc, Stream_Buffer(pdu->s), Stream_Length(pdu->s));
rpc_client_receive_pool_return(rpc, pdu);
rpc->VirtualConnection->State = VIRTUAL_CONNECTION_STATE_OPENED;
WLog_DBG(TAG, "VIRTUAL_CONNECTION_STATE_OPENED");
rpc->client->SynchronousSend = TRUE;
rpc->client->SynchronousReceive = TRUE;
return TRUE;
}
