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bacnet_stack/bacnet-stack/demo/readfile/readfile.c
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/**************************************************************************
*
* Copyright (C) 2006 Steve Karg <skarg@users.sourceforge.net>
*
* 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.
*
*********************************************************************/
/* READFILE: command line tool that reads a file from a BACnet device. */
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <time.h> /* for time */
#include "bactext.h"
#include "iam.h"
#include "arf.h"
#include "tsm.h"
#include "address.h"
#include "config.h"
#include "bacdef.h"
#include "npdu.h"
#include "apdu.h"
#include "device.h"
#include "datalink.h"
#include "whois.h"
/* some demo stuff needed */
#include "handlers.h"
#include "txbuf.h"
// buffer used for receive
static uint8_t Rx_Buf[MAX_MPDU] = {0};
/* global variables used in this file */
static uint32_t Target_File_Object_Instance = 4194303;
static uint32_t Target_Device_Object_Instance = 4194303;
static BACNET_ADDRESS Target_Address;
static char *Local_File_Name = NULL;
static bool End_Of_File_Detected = false;
static bool Error_Detected = false;
static uint8_t Current_Invoke_ID = 0;
#define MIN(X,Y) ((X) < (Y) ? : (X) : (Y))
static void Atomic_Read_File_Error_Handler(
BACNET_ADDRESS *src,
uint8_t invoke_id,
BACNET_ERROR_CLASS error_class,
BACNET_ERROR_CODE error_code)
{
/* FIXME: verify src and invoke id */
(void)src;
(void)invoke_id;
printf("\r\nBACnet Error!\r\n");
printf("Error Class: %s\r\n",
bactext_error_class_name(error_class));
printf("Error Code: %s\r\n",
bactext_error_code_name(error_code));
Error_Detected = true;
}
void MyAbortHandler(
BACNET_ADDRESS *src,
uint8_t invoke_id,
uint8_t abort_reason)
{
/* FIXME: verify src and invoke id */
(void)src;
(void)invoke_id;
printf("\r\nBACnet Abort!\r\n");
printf("Abort Reason: %s\r\n",
bactext_abort_reason_name(abort_reason));
Error_Detected = true;
}
void MyRejectHandler(
BACNET_ADDRESS *src,
uint8_t invoke_id,
uint8_t reject_reason)
{
/* FIXME: verify src and invoke id */
(void)src;
(void)invoke_id;
printf("\r\nBACnet Reject!\r\n");
printf("Reject Reason: %s\r\n",
bactext_reject_reason_name(reject_reason));
Error_Detected = true;
}
static uint8_t Send_Atomic_Read_File_Stream(
uint32_t device_id,
uint32_t file_instance,
int fileStartPosition,
unsigned requestedOctetCount)
{
BACNET_ADDRESS dest;
BACNET_ADDRESS my_address;
unsigned max_apdu = 0;
uint8_t invoke_id = 0;
bool status = false;
int pdu_len = 0;
int bytes_sent = 0;
BACNET_ATOMIC_READ_FILE_DATA data;
/* is the device bound? */
status = address_get_by_device(device_id, &max_apdu, &dest);
/* is there a tsm available? */
if (status)
status = tsm_transaction_available();
if (status)
{
datalink_get_my_address(&my_address);
pdu_len = npdu_encode_apdu(
&Handler_Transmit_Buffer[0],
&dest,
&my_address,
true, // true for confirmed messages
MESSAGE_PRIORITY_NORMAL);
invoke_id = tsm_next_free_invokeID();
// load the data for the encoding
data.object_type = OBJECT_FILE;
data.object_instance = file_instance;
data.access = FILE_STREAM_ACCESS;
data.type.stream.fileStartPosition = fileStartPosition;
data.type.stream.requestedOctetCount = requestedOctetCount;
pdu_len += arf_encode_apdu(
&Handler_Transmit_Buffer[pdu_len],
invoke_id,
&data);
/* will the APDU fit the target device?
note: if there is a bottleneck router in between
us and the destination, we won't know unless
we have a way to check for that and update the
max_apdu in the address binding table. */
if ((unsigned)pdu_len < max_apdu)
{
tsm_set_confirmed_unsegmented_transaction(
invoke_id,
&dest,
&Handler_Transmit_Buffer[0],
pdu_len);
bytes_sent = datalink_send_pdu(
&dest, // destination address
&Handler_Transmit_Buffer[0],
pdu_len); // number of bytes of data
if (bytes_sent <= 0)
fprintf(stderr,"Failed to Send AtomicReadFile Request (%s)!\n",
strerror(errno));
}
else
fprintf(stderr,"Failed to Send AtomicReadFile Request "
"(payload exceeds destination maximum APDU)!\n");
}
return invoke_id;
}
static void Send_WhoIs(uint32_t device_id)
{
int pdu_len = 0;
BACNET_ADDRESS dest;
int bytes_sent = 0;
/* Who-Is is a global broadcast */
datalink_get_broadcast_address(&dest);
/* encode the NPDU portion of the packet */
pdu_len = npdu_encode_apdu(
&Handler_Transmit_Buffer[0],
&dest,
NULL,
false, // true for confirmed messages
MESSAGE_PRIORITY_NORMAL);
/* encode the APDU portion of the packet */
pdu_len += whois_encode_apdu(
&Handler_Transmit_Buffer[pdu_len],
device_id,
device_id);
bytes_sent = datalink_send_pdu(
&dest, /* destination address */
&Handler_Transmit_Buffer[0],
pdu_len); /* number of bytes of data */
if (bytes_sent <= 0)
fprintf(stderr,"Failed to Send Who-Is Request (%s)!\n", strerror(errno));
}
static void AtomicReadFileAckHandler(
uint8_t *service_request,
uint16_t service_len,
BACNET_ADDRESS *src,
BACNET_CONFIRMED_SERVICE_ACK_DATA *service_data)
{
int len = 0;
BACNET_ATOMIC_READ_FILE_DATA data;
FILE *pFile = NULL; /* stream pointer */
size_t octets_written = 0;
(void)src; /* FIXME: validate the source address matches */
len = arf_ack_decode_service_request(
service_request,
service_len,
&data);
if (len > 0)
{
/* validate the parameters before storing data */
if ((data.access == FILE_STREAM_ACCESS) &&
(service_data->invoke_id == Current_Invoke_ID))
{
if (data.type.stream.fileStartPosition == 0)
pFile = fopen(Local_File_Name, "wb");
else
pFile = fopen(Local_File_Name, "rb+");
if (pFile)
{
/* is there anything to do with this? data.stream.requestedOctetCount */
(void)fseek(pFile, data.type.stream.fileStartPosition, SEEK_SET);
octets_written = fwrite(
octetstring_value(&data.fileData),
1, /* unit to write in bytes - in our case, an octet is one byte */
octetstring_length(&data.fileData),
pFile);
if (octets_written != octetstring_length(&data.fileData))
fprintf(stderr,"Unable to write data to file \"%s\".\n",
Local_File_Name);
else
printf("\r%u bytes",
(data.type.stream.fileStartPosition + octets_written));
fclose(pFile);
}
if (data.endOfFile)
{
End_Of_File_Detected = true;
printf("\r\n");
}
}
}
}
static void LocalIAmHandler(
uint8_t *service_request,
uint16_t service_len,
BACNET_ADDRESS *src)
{
int len = 0;
uint32_t device_id = 0;
unsigned max_apdu = 0;
int segmentation = 0;
uint16_t vendor_id = 0;
(void)src;
(void)service_len;
len = iam_decode_service_request(
service_request,
&device_id,
&max_apdu,
&segmentation,
&vendor_id);
if (len != -1)
{
address_add(device_id,
max_apdu,
src);
}
else
fprintf(stderr,"!\n");
return;
}
static void Init_Service_Handlers(void)
{
/* we need to handle who-is
to support dynamic device binding to us */
apdu_set_unconfirmed_handler(
SERVICE_UNCONFIRMED_WHO_IS,
handler_who_is);
/* handle i-am to support binding to other devices */
apdu_set_unconfirmed_handler(
SERVICE_UNCONFIRMED_I_AM,
LocalIAmHandler);
/* set the handler for all the services we don't implement
It is required to send the proper reject message... */
apdu_set_unrecognized_service_handler_handler(
handler_unrecognized_service);
/* we must implement read property - it's required! */
apdu_set_confirmed_handler(
SERVICE_CONFIRMED_READ_PROPERTY,
handler_read_property);
/* handle the data coming back from confirmed requests */
apdu_set_confirmed_ack_handler(
SERVICE_CONFIRMED_ATOMIC_READ_FILE,
AtomicReadFileAckHandler);
/* handle any errors coming back */
apdu_set_error_handler(
SERVICE_CONFIRMED_ATOMIC_READ_FILE,
Atomic_Read_File_Error_Handler);
apdu_set_abort_handler(
MyAbortHandler);
apdu_set_reject_handler(
MyRejectHandler);
}
int main(int argc, char *argv[])
{
BACNET_ADDRESS src = {0}; // address where message came from
uint16_t pdu_len = 0;
unsigned timeout = 100; // milliseconds
unsigned max_apdu = 0;
time_t elapsed_seconds = 0;
time_t last_seconds = 0;
time_t current_seconds = 0;
time_t timeout_seconds = 0;
int fileStartPosition = 0;
unsigned requestedOctetCount = 0;
uint8_t invoke_id = 0;
bool found = false;
uint16_t my_max_apdu = 0;
if (argc < 4)
{
/* FIXME: what about access method - record or stream? */
printf("%s device-instance file-instance local-name\r\n",argv[0]);
return 0;
}
/* decode the command line parameters */
Target_Device_Object_Instance = strtol(argv[1],NULL,0);
Target_File_Object_Instance = strtol(argv[2],NULL,0);
Local_File_Name = argv[3];
if (Target_Device_Object_Instance >= BACNET_MAX_INSTANCE)
{
fprintf(stderr,"device-instance=%u - it must be less than %u\r\n",
Target_Device_Object_Instance,BACNET_MAX_INSTANCE);
return 1;
}
if (Target_File_Object_Instance >= BACNET_MAX_INSTANCE)
{
fprintf(stderr,"file-instance=%u - it must be less than %u\r\n",
Target_File_Object_Instance,BACNET_MAX_INSTANCE+1);
return 1;
}
/* setup my info */
Device_Set_Object_Instance_Number(BACNET_MAX_INSTANCE);
address_init();
Init_Service_Handlers();
/* configure standard BACnet/IP port */
bip_set_port(0xBAC0);
if (!bip_init())
return 1;
/* configure the timeout values */
last_seconds = time(NULL);
timeout_seconds = (Device_APDU_Timeout() / 1000) *
Device_Number_Of_APDU_Retries();
/* try to bind with the device */
Send_WhoIs(Target_Device_Object_Instance);
/* loop forever */
for (;;)
{
/* increment timer - exit if timed out */
current_seconds = time(NULL);
/* returns 0 bytes on timeout */
pdu_len = bip_receive(
&src,
&Rx_Buf[0],
MAX_MPDU,
timeout);
/* process */
if (pdu_len)
{
npdu_handler(
&src,
&Rx_Buf[0],
pdu_len);
}
/* at least one second has passed */
if (current_seconds != last_seconds)
tsm_timer_milliseconds(((current_seconds - last_seconds) * 1000));
if (End_Of_File_Detected || Error_Detected)
break;
if (I_Am_Request)
{
I_Am_Request = false;
iam_send(&Handler_Transmit_Buffer[0]);
}
else
{
/* wait until the device is bound, or timeout and quit */
found = address_bind_request(
Target_Device_Object_Instance,
&max_apdu,
&Target_Address);
if (found)
{
/* calculate the smaller of our APDU size or theirs
and remove the overhead of the APDU (about 14 octets max).
note: we could fail if there is a bottle neck (router)
and smaller MPDU in betweeen. */
if (max_apdu < MAX_APDU)
my_max_apdu = max_apdu;
else
my_max_apdu = MAX_APDU;
requestedOctetCount = my_max_apdu - 14;
/* has the previous invoke id expired or returned?
note: invoke ID = 0 is invalid, so it will be idle */
if ((invoke_id == 0) || tsm_invoke_id_free(invoke_id))
{
if (invoke_id != 0)
fileStartPosition += requestedOctetCount;
/* we'll read the file in chunks
less than max_apdu to keep unsegmented */
invoke_id = Send_Atomic_Read_File_Stream(
Target_Device_Object_Instance,
Target_File_Object_Instance,
fileStartPosition,
requestedOctetCount);
Current_Invoke_ID = invoke_id;
}
}
else
{
/* increment timer - exit if timed out */
elapsed_seconds += (current_seconds - last_seconds);
if (elapsed_seconds > timeout_seconds)
break;
}
}
/* keep track of time for next check */
last_seconds = current_seconds;
}
return 0;
}
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