/************************************************************************** * * Copyright (C) 2005 Steve Karg * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. * *********************************************************************/ #include #include #include #include #include #include "config.h" #include "txbuf.h" #include "bacdef.h" #include "bacdcode.h" #include "bacerror.h" #include "bacdevobjpropref.h" #include "apdu.h" #include "npdu.h" #include "abort.h" #include "reject.h" #include "rp.h" /* device object has custom handler for all objects */ #include "device.h" #include "handlers.h" /** @file h_rp.c Handles Read Property requests. */ /** Handler for a ReadProperty Service request. * @ingroup DSRP * This handler will be invoked by apdu_handler() if it has been enabled * by a call to apdu_set_confirmed_handler(). * This handler builds a response packet, which is * - an Abort if * - the message is segmented * - if decoding fails * - if the response would be too large * - the result from Device_Read_Property(), if it succeeds * - an Error if Device_Read_Property() fails * or there isn't enough room in the APDU to fit the data. * * @param service_request [in] The contents of the service request. * @param service_len [in] The length of the service_request. * @param src [in] BACNET_ADDRESS of the source of the message * @param service_data [in] The BACNET_CONFIRMED_SERVICE_DATA information * decoded from the APDU header of this message. */ void handler_read_property( uint8_t * service_request, uint16_t service_len, BACNET_ADDRESS * src, BACNET_CONFIRMED_SERVICE_DATA * service_data) { BACNET_READ_PROPERTY_DATA rpdata; int len = 0; int pdu_len = 0; int apdu_len = -1; int npdu_len = -1; BACNET_NPDU_DATA npdu_data; bool error = true; /* assume that there is an error */ int bytes_sent = 0; BACNET_ADDRESS my_address; /* configure default error code as an abort since it is common */ rpdata.error_code = ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED; /* encode the NPDU portion of the packet */ datalink_get_my_address(&my_address); npdu_encode_npdu_data(&npdu_data, false, MESSAGE_PRIORITY_NORMAL); npdu_len = npdu_encode_pdu(&Handler_Transmit_Buffer[0], src, &my_address, &npdu_data); if (service_data->segmented_message) { /* we don't support segmentation - send an abort */ len = BACNET_STATUS_ABORT; #if PRINT_ENABLED fprintf(stderr, "RP: Segmented message. Sending Abort!\n"); #endif goto RP_FAILURE; } len = rp_decode_service_request(service_request, service_len, &rpdata); #if PRINT_ENABLED if (len <= 0) { fprintf(stderr, "RP: Unable to decode Request!\n"); } #endif if (len < 0) { /* bad decoding - skip to error/reject/abort handling */ error = true; #if PRINT_ENABLED fprintf(stderr, "RP: Bad Encoding.\n"); #endif goto RP_FAILURE; } /* Test for case of indefinite Device object instance */ if ((rpdata.object_type == OBJECT_DEVICE) && (rpdata.object_instance == BACNET_MAX_INSTANCE)) { rpdata.object_instance = Device_Object_Instance_Number(); } apdu_len = rp_ack_encode_apdu_init(&Handler_Transmit_Buffer[npdu_len], service_data->invoke_id, &rpdata); /* configure our storage */ rpdata.application_data = &Handler_Transmit_Buffer[npdu_len + apdu_len]; rpdata.application_data_len = sizeof(Handler_Transmit_Buffer) - (npdu_len + apdu_len); len = Device_Read_Property(&rpdata); if (len >= 0) { apdu_len += len; len = rp_ack_encode_apdu_object_property_end(&Handler_Transmit_Buffer [npdu_len + apdu_len]); apdu_len += len; if (apdu_len > service_data->max_resp) { /* too big for the sender - send an abort * Setting of error code needed here as read property processing may * have overriden the default set at start */ rpdata.error_code = ERROR_CODE_ABORT_SEGMENTATION_NOT_SUPPORTED; len = BACNET_STATUS_ABORT; #if PRINT_ENABLED fprintf(stderr, "RP: Message too large.\n"); #endif } else { #if PRINT_ENABLED fprintf(stderr, "RP: Sending Ack!\n"); #endif error = false; } } else { #if PRINT_ENABLED fprintf(stderr, "RP: Device_Read_Property: "); if (len == BACNET_STATUS_ABORT) { fprintf(stderr, "Abort!\n"); } else if (len == BACNET_STATUS_ERROR) { fprintf(stderr, "Error!\n"); } else if (len == BACNET_STATUS_REJECT) { fprintf(stderr, "Reject!\n"); } else { fprintf(stderr, "Unknown Len=%d\n", len); } #endif } RP_FAILURE: if (error) { if (len == BACNET_STATUS_ABORT) { apdu_len = abort_encode_apdu(&Handler_Transmit_Buffer[npdu_len], service_data->invoke_id, abort_convert_error_code(rpdata.error_code), true); #if PRINT_ENABLED fprintf(stderr, "RP: Sending Abort!\n"); #endif } else if (len == BACNET_STATUS_ERROR) { apdu_len = bacerror_encode_apdu(&Handler_Transmit_Buffer[npdu_len], service_data->invoke_id, SERVICE_CONFIRMED_READ_PROPERTY, rpdata.error_class, rpdata.error_code); #if PRINT_ENABLED fprintf(stderr, "RP: Sending Error!\n"); #endif } else if (len == BACNET_STATUS_REJECT) { apdu_len = reject_encode_apdu(&Handler_Transmit_Buffer[npdu_len], service_data->invoke_id, reject_convert_error_code(rpdata.error_code)); #if PRINT_ENABLED fprintf(stderr, "RP: Sending Reject!\n"); #endif } } pdu_len = npdu_len + apdu_len; bytes_sent = datalink_send_pdu(src, &npdu_data, &Handler_Transmit_Buffer[0], pdu_len); if (bytes_sent <= 0) { #if PRINT_ENABLED fprintf(stderr, "Failed to send PDU (%s)!\n", strerror(errno)); #endif } return; }