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bacnet-stack/demo/readfile/main.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.
*
*********************************************************************/
/* command line tool that sends a BACnet service, and displays the reply */
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h> /* for time */
#include <errno.h>
#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 "net.h"
#include "datalink.h"
#include "whois.h"
#include "version.h"
/* some demo stuff needed */
#include "filename.h"
#include "handlers.h"
#include "client.h"
#include "txbuf.h"
#include "dlenv.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 = BACNET_MAX_INSTANCE;
static uint32_t Target_Device_Object_Instance = BACNET_MAX_INSTANCE;
static BACNET_ADDRESS Target_Address;
static char *Local_File_Name = NULL;
static int Target_File_Start_Position;
static unsigned int Target_File_Requested_Octet_Count;
static bool End_Of_File_Detected = false;
static bool Error_Detected = false;
static uint8_t Request_Invoke_ID = 0;
static void Atomic_Read_File_Error_Handler(
BACNET_ADDRESS * src,
uint8_t invoke_id,
BACNET_ERROR_CLASS error_class,
BACNET_ERROR_CODE error_code)
{
if (address_match(&Target_Address, src) &&
(invoke_id == Request_Invoke_ID)) {
printf("BACnet Error: %s: %s\n",
bactext_error_class_name((int) error_class),
bactext_error_code_name((int) error_code));
Error_Detected = true;
}
}
void MyAbortHandler(
BACNET_ADDRESS * src,
uint8_t invoke_id,
uint8_t abort_reason,
bool server)
{
(void) server;
if (address_match(&Target_Address, src) &&
(invoke_id == Request_Invoke_ID)) {
printf("BACnet Abort: %s\n",
bactext_abort_reason_name((int) abort_reason));
Error_Detected = true;
}
}
void MyRejectHandler(
BACNET_ADDRESS * src,
uint8_t invoke_id,
uint8_t reject_reason)
{
if (address_match(&Target_Address, src) &&
(invoke_id == Request_Invoke_ID)) {
printf("BACnet Reject: %s\n",
bactext_reject_reason_name((int) reject_reason));
Error_Detected = true;
}
}
static void AtomicReadFileAckHandler(
uint8_t * service_request,
uint16_t service_len,
BACNET_ADDRESS * src,
BACNET_CONFIRMED_SERVICE_ACK_DATA * service_data)
{
int len = 0;
int result = 0;
BACNET_ATOMIC_READ_FILE_DATA data;
FILE *pFile = NULL; /* stream pointer */
size_t octets_written = 0;
if (address_match(&Target_Address, src) &&
(service_data->invoke_id == Request_Invoke_ID)) {
len = arf_ack_decode_service_request(service_request, service_len, &data);
if ((len > 0) && (data.access == FILE_STREAM_ACCESS)) {
if (data.type.stream.fileStartPosition == 0) {
pFile = fopen(Local_File_Name, "wb");
} else {
pFile = fopen(Local_File_Name, "rb+");
}
if (pFile) {
result = fseek(pFile, data.type.stream.fileStartPosition,
SEEK_SET);
if (result == 0) {
/* unit to write in bytes -
in our case, an octet is one byte */
octets_written = fwrite(
octetstring_value(&data.fileData[0]), 1,
octetstring_length(&data.fileData[0]), pFile);
if (octets_written !=
octetstring_length(&data.fileData[0])) {
fprintf(stderr,
"Unable to write data to file \"%s\".\n",
Local_File_Name);
} else if (octets_written == 0) {
fprintf(stderr, "Received 0 byte octet string!.\n");
} else {
Target_File_Start_Position =
data.type.stream.fileStartPosition +
octets_written;
printf("\r%d bytes", (int)Target_File_Start_Position);
}
fflush(pFile);
} else {
fprintf(stderr, "Unable to seek to %d!\n",
data.type.stream.fileStartPosition);
}
fclose(pFile);
}
if (data.endOfFile) {
End_Of_File_Detected = true;
printf("\n");
}
} else {
fprintf(stderr, "Decode error! %d bytes decoded.\n", len);
}
} else {
fprintf(stderr, "Address & Invoke ID mismatch! Invoke ID=%d\n",
Request_Invoke_ID);
}
}
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)
{
Device_Init(NULL);
/* 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);
}
static void print_usage(char *filename)
{
printf("Usage: %s device-instance file-instance local-name\n",
filename);
printf(" [--version][--help]\n");
}
static void print_help(char *filename)
{
printf("Read a file from a BACnet device and save it locally.\n"
"device-instance:\n"
"BACnet Device Object Instance number that you are trying to\n"
"communicate to. This number will be used to try and bind with\n"
"the device using Who-Is and I-Am services. For example, if you were\n"
"reading from Device Object 123, the device-instance would be 123.\n"
"\n"
"file-instance:\n"
"This is the file object instance number that you are reading from.\n"
"For example, if you were reading from File 2, \n"
"the file-instance would be 2.\n"
"\n"
"local-name:\n"
"The name of the file that will be stored locally.\n"
"\n"
"Example:\n"
"If you want read File 2 from Device 123 and save it to temp.txt,\n"
"use the following command:\n"
"%s 123 2 temp.txt\n",
filename);
}
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;
uint8_t invoke_id = 0;
bool found = false;
uint16_t my_max_apdu = 0;
int argi = 0;
char *filename = NULL;
/* print help if requested */
filename = filename_remove_path(argv[0]);
for (argi = 1; argi < argc; argi++) {
if (strcmp(argv[argi], "--help") == 0) {
print_usage(filename);
print_help(filename);
return 0;
}
if (strcmp(argv[argi], "--version") == 0) {
printf("%s %s\n", filename, BACNET_VERSION_TEXT);
printf("Copyright (C) 2014 by Steve Karg and others.\n"
"This is free software; see the source for copying conditions.\n"
"There is NO warranty; not even for MERCHANTABILITY or\n"
"FITNESS FOR A PARTICULAR PURPOSE.\n");
return 0;
}
}
if (argc < 4) {
print_usage(filename);
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\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\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();
dlenv_init();
atexit(datalink_cleanup);
/* configure the timeout values */
last_seconds = time(NULL);
timeout_seconds = (apdu_timeout() / 1000) * apdu_retries();
/* try to bind with the device */
found =
address_bind_request(Target_Device_Object_Instance, &max_apdu,
&Target_Address);
if (!found) {
Send_WhoIs(Target_Device_Object_Instance,
Target_Device_Object_Instance);
}
/* loop forever */
for (;;) {
/* increment timer - exit if timed out */
current_seconds = time(NULL);
/* returns 0 bytes on timeout */
pdu_len = datalink_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));
}
/* wait until the device is bound, or timeout and quit */
if (!found) {
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 16 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;
}
/* Typical sizes are 50, 128, 206, 480, 1024, and 1476 octets */
if (my_max_apdu <= 50) {
Target_File_Requested_Octet_Count = my_max_apdu - 20;
} else if (my_max_apdu <= 480) {
Target_File_Requested_Octet_Count = my_max_apdu - 32;
} else if (my_max_apdu <= 1476) {
Target_File_Requested_Octet_Count = my_max_apdu - 64;
} else {
Target_File_Requested_Octet_Count = my_max_apdu / 2;
}
/* 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 (End_Of_File_Detected || Error_Detected) {
break;
}
/* the ACK will increment the start position if OK */
/* 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, Target_File_Start_Position,
Target_File_Requested_Octet_Count);
Request_Invoke_ID = invoke_id;
} else if (tsm_invoke_id_failed(invoke_id)) {
fprintf(stderr, "\rError: TSM Timeout!\n");
tsm_free_invoke_id(invoke_id);
/* try again or abort? */
Error_Detected = true;
break;
}
} else {
/* increment timer - exit if timed out */
elapsed_seconds += (current_seconds - last_seconds);
if (elapsed_seconds > timeout_seconds) {
fprintf(stderr, "\rError: APDU Timeout!\n");
Error_Detected = true;
break;
}
}
/* keep track of time for next check */
last_seconds = current_seconds;
}
if (Error_Detected) {
return 1;
}
return 0;
}
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