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bacnet_stack/apps/mstpcrc/main.c
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Kari Argillander cb243c36a8 Improve SPDX identifier coverage (#716) 
* Change MIT license texts to SPDX-License-Identifier

SPDX-License-Identifier is much easier to understand and grep than
license text so use that instead.

* Change GPL exception license texts to SPDX-License-Identifier

SPDX-License-Identifier is much easier to understand and grep than
license text so use that instead.

* Change misc license texts to SPDX-License-Identifier

There are some external code in repo which are not licenses as most of
the stuff in this repo. We still want every file to have SPDX identifier
to easily grep licenses.

* Add currently used license files

Even though Bacnet-Stack is using SPDX identifiers we still need to give
those license files with source. For this reason add all license files
to license/ folder.

SPDX has also files which would make same thing but this is style which
example Linux kernel is using and it is quite clear so I choose that one
for now.

I choosed not yet bring CC-PDDC as that is not right license for those
files.

---------

Co-authored-by: Kari Argillander <kari.argillander@fidelix.com>
2024-08-12 15:33:02 -05:00

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/**************************************************************************
*
* Copyright (C) 2012 Steve Karg
*
* SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
*
*********************************************************************/
#include <stddef.h>
#include <stdint.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <time.h>
#include <ctype.h>
/* BACnet Stack defines - first */
#include "bacnet/bacdef.h"
/* BACnet Stack API */
#include "bacnet/basic/sys/mstimer.h"
#include "bacnet/datalink/crc.h"
#include "bacnet/version.h"
/* OS specific include*/
#include "bacport.h"
#ifndef max
#define max(a, b) (((a)(b)) ? (a) : (b))
#define min(a, b) (((a) < (b)) ? (a) : (b))
#endif
/* buffer needed by CRC functions */
static uint8_t CRC_Buffer[1512];
static unsigned CRC_Buffer_Len = 0;
/* flags needed for options */
static bool ASCII_Decimal = false;
static unsigned CRC_Size = 8;
/* save to capture file for viewing in Wireshark */
static bool MSTP_Cap = false;
static bool MSTP_Text_File = false;
static char Capture_Filename[64] = "mstp_20090123091200.cap";
static FILE *pFile = NULL; /* stream pointer */
static FILE *pText_File = NULL; /* stream pointer */
/******************************************************************
* DESCRIPTION: Takes one of the arguments passed by the main function
* and converts it into a buffer value.
* argi - single argument in string form.
* RETURN: nothing
* NOTES: none
******************************************************************/
static void Parse_Number(char *argi)
{
long long_value = 0;
if (ASCII_Decimal) {
long_value = strtol(argi, NULL, 10);
} else {
long_value = strtol(argi, NULL, 16);
}
CRC_Buffer[CRC_Buffer_Len] = (uint8_t)long_value;
CRC_Buffer_Len++;
}
/******************************************************************
* DESCRIPTION: Takes one of the arguments passed by the main function
* and sets flags if it matches one of the predefined args.
* PARAMETERS: argc (IN) number of arguments.
* argv (IN) an array of arguments in string form.
* RETURN: number of arguments parsed
* NOTES: none
******************************************************************/
static void Parse_Arguments(int argc, char *argv[])
{
int i = 0;
long long_value = 0;
for (i = 1; i < argc; i++) {
if (argv[i][0] == '-') {
/* numeric arguments */
if (isdigit(argv[i][1])) {
long_value = strtol(&argv[i][1], NULL, 10);
/* dash arguments */
switch (long_value) {
case 8:
CRC_Size = 8;
break;
case 16:
CRC_Size = 16;
break;
case 32:
CRC_Size = 32;
break;
default:
break;
}
}
/* dash arguments */
switch (argv[i][1]) {
case 'h':
case 'H':
ASCII_Decimal = false;
break;
case 'd':
case 'D':
ASCII_Decimal = true;
break;
case 'm':
case 'M':
MSTP_Cap = true;
break;
case 'f':
case 'F':
MSTP_Text_File = true;
break;
default:
break;
}
} else {
if (MSTP_Text_File) {
/* open existing file. */
pText_File = fopen(argv[i], "r");
} else {
/* should be number values here */
Parse_Number(argv[i]);
}
}
}
}
static void filename_create(char *filename, size_t filesize)
{
time_t my_time;
struct tm *today;
if (filename) {
my_time = time(NULL);
today = localtime(&my_time);
snprintf(filename, filesize, "mstp_%04d%02d%02d%02d%02d%02d.cap",
1900 + today->tm_year, 1 + today->tm_mon, today->tm_mday,
today->tm_hour, today->tm_min, today->tm_sec);
}
}
/* write packet to file in libpcap format */
static void write_global_header(const char *filename)
{
uint32_t magic_number = 0xa1b2c3d4; /* magic number */
uint16_t version_major = 2; /* major version number */
uint16_t version_minor = 4; /* minor version number */
int32_t thiszone = 0; /* GMT to local correction */
uint32_t sigfigs = 0; /* accuracy of timestamps */
uint32_t snaplen = 65535; /* max length of captured packets, in octets */
uint32_t network = 165; /* data link type - BACNET_MS_TP */
/* create a new file. */
pFile = fopen(filename, "wb");
if (pFile) {
(void)fwrite(&magic_number, sizeof(magic_number), 1, pFile);
(void)fwrite(&version_major, sizeof(version_major), 1, pFile);
(void)fwrite(&version_minor, sizeof(version_minor), 1, pFile);
(void)fwrite(&thiszone, sizeof(thiszone), 1, pFile);
(void)fwrite(&sigfigs, sizeof(sigfigs), 1, pFile);
(void)fwrite(&snaplen, sizeof(snaplen), 1, pFile);
(void)fwrite(&network, sizeof(network), 1, pFile);
fflush(pFile);
fprintf(stdout, "mstpcap: saving capture to %s\n", filename);
} else {
fprintf(stderr, "mstpcap[header]: failed to open %s: %s\n", filename,
strerror(errno));
}
}
static void write_received_packet(uint8_t *buffer, unsigned length)
{
uint32_t ts_sec; /* timestamp seconds */
uint32_t ts_usec; /* timestamp microseconds */
uint32_t incl_len; /* number of octets of packet saved in file */
uint32_t orig_len; /* actual length of packet */
struct timeval tv;
if (pFile) {
gettimeofday(&tv, NULL);
ts_sec = tv.tv_sec;
ts_usec = tv.tv_usec;
(void)fwrite(&ts_sec, sizeof(ts_sec), 1, pFile);
(void)fwrite(&ts_usec, sizeof(ts_usec), 1, pFile);
orig_len = incl_len = length;
(void)fwrite(&incl_len, sizeof(incl_len), 1, pFile);
(void)fwrite(&orig_len, sizeof(orig_len), 1, pFile);
(void)fwrite(buffer, length, 1, pFile);
} else {
fprintf(stderr, "mstpcrc[packet]: failed to open %s: %s\n",
Capture_Filename, strerror(errno));
}
}
static void Write_Pcap(uint8_t *buffer, unsigned length)
{
filename_create(&Capture_Filename[0], sizeof(Capture_Filename));
write_global_header(&Capture_Filename[0]);
write_received_packet(buffer, length);
if (pFile) {
fclose(pFile);
}
}
/* hold 3 ASCII characters per byte of data */
static char Text_Buffer[1024 * 3];
static void Process_Text_File(void)
{
char *argi = NULL;
filename_create(&Capture_Filename[0], sizeof(Capture_Filename));
write_global_header(&Capture_Filename[0]);
while (fgets(Text_Buffer, sizeof(Text_Buffer), pText_File)) {
CRC_Buffer_Len = 0;
do {
if (!argi) {
argi = strtok(Text_Buffer, " ");
} else {
argi = strtok(NULL, " ");
}
if (argi) {
Parse_Number(argi);
}
} while (argi);
write_received_packet(CRC_Buffer, CRC_Buffer_Len);
}
if (pFile) {
fclose(pFile);
}
if (pText_File) {
fclose(pText_File);
}
}
/* simple program to CRC the data and print the CRC */
int main(int argc, char *argv[])
{
/* accumulates the crc value */
uint8_t crc8 = 0xff;
uint16_t crc16 = 0xffff;
unsigned i = 0;
/* initialize our interface */
if ((argc > 1) && (strcmp(argv[1], "--help") == 0)) {
printf(
"mstpcrc [options] <05 03 01 0D...>\r\n"
"perform MS/TP CRC on data bytes.\r\n"
"options:\r\n"
"[-x] interprete the arguments as ascii hex (default)\r\n"
"[-d] interprete the argument as ascii decimal\r\n"
"[-m] Write the bytes to Wireshark capture file\r\n"
"[-8] calculate the MS/TP 8-bit Header CRC (default)\r\n"
"[-16] calculate the MS/TP 16-bit Data CRC\r\n"
"[-32] calculate the MS/TP 32-bit Extended Frame CRC\r\n"
"[-f filename] read MS/TP capture data from text file\r\n"
"Note: MS/TP Header CRC does not include the 55 FF preamble.\r\n");
return 0;
}
if ((argc > 1) && (strcmp(argv[1], "--version") == 0)) {
printf("mstpcap %s\r\n", BACNET_VERSION_TEXT);
printf(
"Copyright (C) 2012 by Steve Karg\r\n"
"This is free software; see the source for copying conditions.\r\n"
"There is NO warranty; not even for MERCHANTABILITY or\r\n"
"FITNESS FOR A PARTICULAR PURPOSE.\r\n");
return 0;
}
Parse_Arguments(argc, argv);
if (MSTP_Text_File) {
Process_Text_File();
} else if (CRC_Buffer_Len) {
if (MSTP_Cap) {
Write_Pcap(CRC_Buffer, CRC_Buffer_Len);
} else {
for (i = 0; i < CRC_Buffer_Len; i++) {
if (CRC_Size == 8) {
crc8 = CRC_Calc_Header(CRC_Buffer[i], crc8);
} else if (CRC_Size == 16) {
crc16 = CRC_Calc_Data(CRC_Buffer[i], crc16);
}
if (ASCII_Decimal) {
printf("%u\r\n", (unsigned)CRC_Buffer[i]);
} else {
printf("0x%02X\r\n", CRC_Buffer[i]);
}
}
if (CRC_Size == 8) {
crc8 = ~crc8;
if (ASCII_Decimal) {
printf("%u Header CRC\r\n", (unsigned)crc8);
} else {
printf("0x%02X Header CRC\r\n", crc8);
}
} else if (CRC_Size == 16) {
crc16 = ~crc16;
if (ASCII_Decimal) {
printf("%u Data CRC\r\n", (unsigned)(crc16 & 0xFF));
printf("%u Data CRC\r\n", (unsigned)(crc16 >> 8));
} else {
printf("0x%02X Data CRC\r\n", (crc16 & 0xFF));
printf("0x%02X Data CRC\r\n", (crc16 >> 8));
}
}
}
}
return 1;
}
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