proxmark3/client/cmdtrace.c

//-----------------------------------------------------------------------------
// Copyright (C) 2018 iceman <iceman at iuse.se>
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Trace commands
//-----------------------------------------------------------------------------
#include "cmdtrace.h"

static int CmdHelp(const char *Cmd);

// trace pointer
static uint8_t *trace;
long traceLen = 0;
bool preRDV40 = true;
	
int usage_trace_list(){
	PrintAndLogEx(NORMAL, "List protocol data in trace buffer.");
	PrintAndLogEx(NORMAL, "Usage:  trace list <protocol> [f][c| <0|1>");
	PrintAndLogEx(NORMAL, "    f      - show frame delay times as well");
	PrintAndLogEx(NORMAL, "    c      - mark CRC bytes");
	PrintAndLogEx(NORMAL, "    <0|1>  - use data from Tracebuffer, if not set, try reading data from tag.");
	PrintAndLogEx(NORMAL, "Supported <protocol> values:");
	PrintAndLogEx(NORMAL, "    raw    - just show raw data without annotations");
	PrintAndLogEx(NORMAL, "    14a    - interpret data as iso14443a communications");
	PrintAndLogEx(NORMAL, "    mf     - interpret data as iso14443a communications and decrypt crypto1 stream");
	PrintAndLogEx(NORMAL, "    14b    - interpret data as iso14443b communications");
	PrintAndLogEx(NORMAL, "    15     - interpret data as iso15693 communications");
	PrintAndLogEx(NORMAL, "    des    - interpret data as DESFire communications");
#ifdef WITH_EMV
	PrintAndLogEx(NORMAL, "    emv    - interpret data as EMV / communications");
#endif	
	PrintAndLogEx(NORMAL, "    iclass - interpret data as iclass communications");
	PrintAndLogEx(NORMAL, "    topaz  - interpret data as topaz communications");
	PrintAndLogEx(NORMAL, "    7816   - interpret data as iso7816-4 communications");
	PrintAndLogEx(NORMAL, "    legic  - interpret data as LEGIC communications");
	PrintAndLogEx(NORMAL, "    felica - interpret data as ISO18092 / FeliCa communications");
	PrintAndLogEx(NORMAL, "");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "        trace list 14a f");
	PrintAndLogEx(NORMAL, "        trace list iclass");
	return 0;
}
int usage_trace_load(){
	PrintAndLogEx(NORMAL, "Load protocol data from file to trace buffer.");
	PrintAndLogEx(NORMAL, "Usage:  trace load <filename>");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "        trace lload mytracefile.bin");
	return 0;
}
int usage_trace_save(){
	PrintAndLogEx(NORMAL, "Save protocol data from trace buffer to file.");
	PrintAndLogEx(NORMAL, "Usage:  trace save <filename>");
	PrintAndLogEx(NORMAL, "Examples:");
	PrintAndLogEx(NORMAL, "        trace save mytracefile.bin");
	return 0;
}

bool is_last_record(uint16_t tracepos, uint8_t *trace, uint16_t traceLen) {
	return(tracepos + sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t) >= traceLen);
}

bool next_record_is_response(uint16_t tracepos, uint8_t *trace) {
	uint16_t next_records_datalen = *((uint16_t *)(trace + tracepos + sizeof(uint32_t) + sizeof(uint16_t)));	
	return(next_records_datalen & 0x8000);
}

bool merge_topaz_reader_frames(uint32_t timestamp, uint32_t *duration, uint16_t *tracepos, uint16_t traceLen,
								uint8_t *trace, uint8_t *frame, uint8_t *topaz_reader_command, uint16_t *data_len) {

#define MAX_TOPAZ_READER_CMD_LEN	16

	uint32_t last_timestamp = timestamp + *duration;

	if ((*data_len != 1) || (frame[0] == TOPAZ_WUPA) || (frame[0] == TOPAZ_REQA)) return false;

	memcpy(topaz_reader_command, frame, *data_len);

	while (!is_last_record(*tracepos, trace, traceLen) && !next_record_is_response(*tracepos, trace)) {
		uint32_t next_timestamp = *((uint32_t *)(trace + *tracepos));
		*tracepos += sizeof(uint32_t);
		uint16_t next_duration = *((uint16_t *)(trace + *tracepos));
		*tracepos += sizeof(uint16_t);
		uint16_t next_data_len = *((uint16_t *)(trace + *tracepos)) & 0x7FFF;
		*tracepos += sizeof(uint16_t);
		uint8_t *next_frame = (trace + *tracepos);
		*tracepos += next_data_len;
		if ((next_data_len == 1) && (*data_len + next_data_len <= MAX_TOPAZ_READER_CMD_LEN)) {
			memcpy(topaz_reader_command + *data_len, next_frame, next_data_len);
			*data_len += next_data_len;
			last_timestamp = next_timestamp + next_duration;
		} else {
			// rewind and exit
			*tracepos = *tracepos - next_data_len - sizeof(uint16_t) - sizeof(uint16_t) - sizeof(uint32_t);
			break;
		}
		uint16_t next_parity_len = (next_data_len-1)/8 + 1;
		*tracepos += next_parity_len;
	}

	*duration = last_timestamp - timestamp;
	
	return true;
}

uint16_t printTraceLine(uint16_t tracepos, uint16_t traceLen, uint8_t *trace, uint8_t protocol, bool showWaitCycles, bool markCRCBytes) {
	// sanity check
	if (tracepos + sizeof(uint32_t) + sizeof(uint16_t) + sizeof(uint16_t) > traceLen) return traceLen;

	bool isResponse;
	uint16_t data_len, parity_len;
	uint32_t duration, timestamp, first_timestamp, EndOfTransmissionTimestamp;
	uint8_t topaz_reader_command[9];
	char explanation[30] = {0};
	uint8_t mfData[32] = {0};
	size_t mfDataLen = 0;

		
	first_timestamp = *((uint32_t *)(trace));
	timestamp = *((uint32_t *)(trace + tracepos));
	tracepos += 4;

	duration = *((uint16_t *)(trace + tracepos));
	tracepos += 2;

	data_len = *((uint16_t *)(trace + tracepos));
	tracepos += 2;

	if (data_len & 0x8000) {
		data_len &= 0x7fff;
		isResponse = true;
	} else {
		isResponse = false;
	}
	parity_len = (data_len-1)/8 + 1;

	if (tracepos + data_len + parity_len > traceLen) {
		return traceLen;
	}
	uint8_t *frame = trace + tracepos;
	tracepos += data_len;
	uint8_t *parityBytes = trace + tracepos;
	tracepos += parity_len;

	if (protocol == TOPAZ && !isResponse) {
		// topaz reader commands come in 1 or 9 separate frames with 7 or 8 Bits each.
		// merge them:
		if (merge_topaz_reader_frames(timestamp, &duration, &tracepos, traceLen, trace, frame, topaz_reader_command, &data_len)) {
			frame = topaz_reader_command;
		}
	}
	
	//Check the CRC status
	uint8_t crcStatus = 2;

	if (data_len > 2) {
		switch (protocol) {
			case ICLASS:
				crcStatus = iclass_CRC_check(isResponse, frame, data_len);
				break;
			case ISO_14443B:
			case TOPAZ:
			case FELICA:
				crcStatus = iso14443B_CRC_check(frame, data_len);
				break;
			case PROTO_MIFARE:
				crcStatus = mifare_CRC_check(isResponse, frame, data_len);		
			case ISO_14443A:
			case MFDES:
				crcStatus = iso14443A_CRC_check(isResponse, frame, data_len);
				break;
			case ISO_15693:
				crcStatus = iso15693_CRC_check(frame, data_len);
				break;
			default: 
				break;
		}
	}
	//0 CRC-command, CRC not ok
	//1 CRC-command, CRC ok
	//2 Not crc-command

	//--- Draw the data column
	char line[18][110];

	for (int j = 0; j < data_len && j/18 < 18; j++) {

		uint8_t parityBits = parityBytes[j >> 3];
		if (protocol != LEGIC &&
			protocol != ISO_14443B && 
			protocol != ISO_7816_4 &&
			(isResponse || protocol == ISO_14443A) &&
			(oddparity8(frame[j]) != ((parityBits >> (7-(j&0x0007))) & 0x01))) {
				
			snprintf(line[j/18]+(( j % 18) * 4),110, "%02x! ", frame[j]);
		} else {
			snprintf(line[j/18]+(( j % 18) * 4),110, "%02x  ", frame[j]);
		}

	}

	if (markCRCBytes) {
		//CRC-command
		if(crcStatus == 0 || crcStatus == 1) {
			char *pos1 = line[(data_len-2)/18]+(((data_len-2) % 18) * 4);
			(*pos1) = '[';
			char *pos2 = line[(data_len)/18]+(((data_len) % 18) * 4);
			sprintf(pos2, "%c", ']');
		}
	}

	if (data_len == 0 ) {
		sprintf(line[0],"<empty trace - possible error>");
		return tracepos;
	}

	// Draw the CRC column
	char *crc = (crcStatus == 0 ? "!crc" : (crcStatus == 1 ? " ok " : "    "));

	EndOfTransmissionTimestamp = timestamp + duration;

	// Always annotate LEGIC read/tag
	if ( protocol == LEGIC )
		annotateLegic(explanation, sizeof(explanation), frame, data_len);

	if ( protocol == PROTO_MIFARE )
		annotateMifare(explanation, sizeof(explanation), frame, data_len, parityBytes, parity_len, isResponse);
		
	if (!isResponse)	{
		switch(protocol) {
			case ICLASS:		annotateIclass(explanation,sizeof(explanation),frame,data_len); break;
			case ISO_14443A:	annotateIso14443a(explanation,sizeof(explanation),frame,data_len); break;
			case MFDES:			annotateMfDesfire(explanation,sizeof(explanation),frame,data_len); break;
			case ISO_14443B:	annotateIso14443b(explanation,sizeof(explanation),frame,data_len); break;
			case TOPAZ:			annotateTopaz(explanation,sizeof(explanation),frame,data_len); break;
			case ISO_7816_4:	annotateIso7816(explanation,sizeof(explanation),frame,data_len); break;
			case ISO_15693:		annotateIso15693(explanation,sizeof(explanation),frame,data_len); break;
			case FELICA:		annotateFelica(explanation,sizeof(explanation),frame,data_len); break;
			default:			break;
		}
	}

	int num_lines = MIN((data_len - 1)/18 + 1, 18);
	for (int j = 0; j < num_lines ; j++) {
		if (j == 0) {
			PrintAndLogEx(NORMAL, " %10u | %10u | %s |%-72s | %s| %s",
				(timestamp - first_timestamp),
				(EndOfTransmissionTimestamp - first_timestamp),
				(isResponse ? "Tag" : "Rdr"),
				line[j],
				(j == num_lines-1) ? crc : "    ",
				(j == num_lines-1) ? explanation : "");
		} else {
			PrintAndLogEx(NORMAL, "            |            |     |%-72s | %s| %s",
				line[j],
				(j == num_lines-1) ? crc : "    ",
				(j == num_lines-1) ? explanation : "");
		}
	}

	if (DecodeMifareData(frame, data_len, parityBytes, isResponse, mfData, &mfDataLen)) {
		memset(explanation, 0x00, sizeof(explanation));
		if (!isResponse) {
			annotateIso14443a(explanation, sizeof(explanation), mfData, mfDataLen);
		}
		uint8_t crcc = iso14443A_CRC_check(isResponse, mfData, mfDataLen);
		PrintAndLogEx(NORMAL, "            |            |  *  |%-72s | %-4s| %s",
			sprint_hex_inrow_spaces(mfData, mfDataLen, 2),
			(crcc == 0 ? "!crc" : (crcc == 1 ? " ok " : "    ")),
			explanation);
	};

	if (is_last_record(tracepos, trace, traceLen)) return traceLen;
	
	if (showWaitCycles && !isResponse && next_record_is_response(tracepos, trace)) {
		uint32_t next_timestamp = *((uint32_t *)(trace + tracepos));
			PrintAndLogEx(NORMAL, " %10u | %10u | %s |fdt (Frame Delay Time): %d",
				(EndOfTransmissionTimestamp - first_timestamp),
				(next_timestamp - first_timestamp),
				"   ",
				(next_timestamp - EndOfTransmissionTimestamp));
		}

	return tracepos;
}

void printFelica(uint16_t traceLen, uint8_t *trace) {

	PrintAndLogEx(NORMAL, "    Gap | Src | Data                            | CRC      | Annotation        |");
	PrintAndLogEx(NORMAL, "--------|-----|---------------------------------|----------|-------------------|");
    uint16_t tracepos = 0;

    while( tracepos < traceLen) {

		if (tracepos + 3 >= traceLen) break;

		uint16_t gap = (uint16_t)trace[tracepos+1] + ((uint16_t)trace[tracepos] >> 8);
		uint16_t crc_ok = trace[tracepos+2];
		tracepos += 3;

		if (tracepos + 3 >= traceLen) break;

		uint16_t len = trace[tracepos+2];

		//I am stripping SYNC
		tracepos += 3; //skip SYNC

		if( tracepos + len + 1 >= traceLen) break;

		uint8_t cmd = trace[tracepos];
		uint8_t isResponse = cmd&1;

		char line[32][110];
		for (int j = 0; j < len+1 && j/8 < 32; j++) {
			snprintf(line[j/8]+(( j % 8) * 4), 110, " %02x ", trace[tracepos+j]);
		}
		char expbuf[50];
		switch(cmd) {
			case FELICA_POLL_REQ: snprintf(expbuf,49,"Poll Req");break;
			case FELICA_POLL_ACK: snprintf(expbuf,49,"Poll Resp");break;

			case FELICA_REQSRV_REQ: snprintf(expbuf,49,"Request Srvc Req");break;
			case FELICA_REQSRV_ACK: snprintf(expbuf,49,"Request Srv Resp");break;

			case FELICA_RDBLK_REQ: snprintf(expbuf,49,"Read block(s) Req");break;
			case FELICA_RDBLK_ACK: snprintf(expbuf,49,"Read block(s) Resp");break;

			case FELICA_WRTBLK_REQ: snprintf(expbuf,49,"Write block(s) Req");break;
			case FELICA_WRTBLK_ACK: snprintf(expbuf,49,"Write block(s) Resp");break;
			case FELICA_SRCHSYSCODE_REQ: snprintf(expbuf,49,"Search syscode Req");break;
			case FELICA_SRCHSYSCODE_ACK: snprintf(expbuf,49,"Search syscode Resp");break;

			case FELICA_REQSYSCODE_REQ: snprintf(expbuf,49,"Request syscode Req");break;
			case FELICA_REQSYSCODE_ACK: snprintf(expbuf,49,"Request syscode Resp");break;

			case FELICA_AUTH1_REQ: snprintf(expbuf,49,"Auth1 Req");break;
			case FELICA_AUTH1_ACK: snprintf(expbuf,49,"Auth1 Resp");break;

			case FELICA_AUTH2_REQ: snprintf(expbuf,49,"Auth2 Req");break;
			case FELICA_AUTH2_ACK: snprintf(expbuf,49,"Auth2 Resp");break;

			case FELICA_RDSEC_REQ: snprintf(expbuf,49,"Secure read Req");break;
			case FELICA_RDSEC_ACK: snprintf(expbuf,49,"Secure read Resp");break;

			case FELICA_WRTSEC_REQ: snprintf(expbuf,49,"Secure write Req");break;
			case FELICA_WRTSEC_ACK: snprintf(expbuf,49,"Secure write Resp");break;

			case FELICA_REQSRV2_REQ: snprintf(expbuf,49,"Request Srvc v2 Req");break;
			case FELICA_REQSRV2_ACK: snprintf(expbuf,49,"Request Srvc v2 Resp");break;

			case FELICA_GETSTATUS_REQ: snprintf(expbuf,49,"Get status Req");break;
			case FELICA_GETSTATUS_ACK: snprintf(expbuf,49,"Get status Resp");break;

			case FELICA_OSVER_REQ: snprintf(expbuf,49,"Get OS Version Req");break;
			case FELICA_OSVER_ACK: snprintf(expbuf,49,"Get OS Version Resp");break;

			case FELICA_RESET_MODE_REQ: snprintf(expbuf,49,"Reset mode Req");break;
			case FELICA_RESET_MODE_ACK: snprintf(expbuf,49,"Reset mode Resp");break;

			case FELICA_AUTH1V2_REQ: snprintf(expbuf,49,"Auth1 v2 Req");break;
			case FELICA_AUTH1V2_ACK: snprintf(expbuf,49,"Auth1 v2 Resp");break;

			case FELICA_AUTH2V2_REQ: snprintf(expbuf,49,"Auth2 v2 Req");break;
			case FELICA_AUTH2V2_ACK: snprintf(expbuf,49,"Auth2 v2 Resp");break;

			case FELICA_RDSECV2_REQ: snprintf(expbuf,49,"Secure read v2 Req");break;
			case FELICA_RDSECV2_ACK: snprintf(expbuf,49,"Secure read v2 Resp");break;
			case FELICA_WRTSECV2_REQ: snprintf(expbuf,49,"Secure write v2 Req");break;
			case FELICA_WRTSECV2_ACK: snprintf(expbuf,49,"Secure write v2 Resp");break;

			case FELICA_UPDATE_RNDID_REQ: snprintf(expbuf,49,"Update IDr Req");break;
			case FELICA_UPDATE_RNDID_ACK: snprintf(expbuf,49,"Update IDr Resp");break;
			default: snprintf(expbuf,49,"Unknown");break;
		}
		
		int num_lines = MIN((len )/16 + 1, 16);
		for (int j = 0; j < num_lines ; j++) {
			if (j == 0) {
				PrintAndLogEx(NORMAL, "%7d | %s |%-32s |%02x %02x %s| %s",
					gap,
					(isResponse ? "Tag" : "Rdr"),
					line[j],
					trace[tracepos+len],
					trace[tracepos+len+1],
					(crc_ok) ? "OK" : "NG",
					expbuf);
			} else {
				PrintAndLogEx(NORMAL, "        |     |%-32s |        |    ", line[j]);
			}
		}
		tracepos += len + 1;
	}
    PrintAndLogEx(NORMAL, "");
}

// sanity check. Don't use proxmark if it is offline and you didn't specify useTraceBuffer
static int SanityOfflineCheck( bool useTraceBuffer ){
	if ( !useTraceBuffer && offline) {
		PrintAndLogEx(NORMAL, "Your proxmark3 device is offline. Specify [1] to use TraceBuffer data instead");
		return 0;
	}
	return 1;
}

int CmdTraceList(const char *Cmd) {

	clearCommandBuffer();
		
	bool showWaitCycles = false;
	bool markCRCBytes = false;
	bool isOnline = true;
	bool errors = false;
	uint8_t protocol = 0;
	char type[10] = {0};

	//int tlen = param_getstr(Cmd,0,type);
	//char param1 = param_getchar(Cmd, 1);
	//char param2 = param_getchar(Cmd, 2);

	char cmdp = 0;
	while (param_getchar(Cmd, cmdp) != 0x00 && !errors) {
		
		int slen = param_getstr(Cmd, cmdp, type, sizeof(type) );
		if ( slen == 1) {
			
			switch ( tolower(param_getchar(Cmd, cmdp))) {
			case 'h':
				return usage_trace_list();
			case 'f':
				showWaitCycles = true;
				cmdp++;
				break;
			case 'c':
				markCRCBytes = true;
				cmdp++;
				break;
			case '0':
				isOnline = true;
				cmdp++;
				break;
			case '1':
				isOnline = false;
				cmdp++;				
				break;
			default:
				PrintAndLogEx(WARNING, "Unknown parameter '%c'", param_getchar(Cmd, cmdp));
				errors = true;
				break;
			}
			
		} else {			
			
			str_lower(type);
			
			// validate type of output
			if (strcmp(type,     "iclass") == 0)	protocol = ICLASS;
			else if(strcmp(type, "14a") == 0)		protocol = ISO_14443A;
			else if(strcmp(type, "14b") == 0)		protocol = ISO_14443B;
			else if(strcmp(type, "topaz") == 0)		protocol = TOPAZ;
			else if(strcmp(type, "7816") == 0)		protocol = ISO_7816_4;	
			else if(strcmp(type, "des") == 0)		protocol = MFDES;
			else if(strcmp(type, "legic") == 0)		protocol = LEGIC;
			else if(strcmp(type, "15") == 0)		protocol = ISO_15693;
			else if(strcmp(type, "felica") == 0)	protocol = FELICA;
			else if(strcmp(type, "mf") == 0)		protocol = PROTO_MIFARE;
			else if(strcmp(type, "raw") == 0)		protocol = -1;//No crc, no annotations
			else errors = true;
			
			cmdp++;
		}		
	}
	
	//if (!SanityOfflineCheck(isOnline)) return 1;
	
	//Validations
	if (errors) return usage_trace_list();
	
	uint16_t tracepos = 0;
	// reserv some space.
	if (!trace) {
		printf("trace pointer not allocated\n");
		trace = calloc(USB_CMD_DATA_SIZE, sizeof(uint8_t));
	}
	
	if ( isOnline ) {
		// Query for the size of the trace,  downloading USB_CMD_DATA_SIZE
		UsbCommand response;
		if ( !GetFromDevice(BIG_BUF, trace, USB_CMD_DATA_SIZE, 0, &response, 4000, true)) {
			PrintAndLogEx(WARNING, "timeout while waiting for reply.");
			return 1;
		}
		
		traceLen = response.arg[2];
		if (traceLen > USB_CMD_DATA_SIZE) {
			uint8_t *p = realloc(trace, traceLen);
			if (p == NULL) {
				PrintAndLogEx(FAILED, "Cannot allocate memory for trace");
				free(trace);
				return 2;
			}
			trace = p;
			if ( !GetFromDevice(BIG_BUF, trace, traceLen, 0, NULL, 2500, false)) {
				PrintAndLogEx(WARNING, "command execution time out");
				free(trace);
				return 3;
			}
		}		
	}

	PrintAndLogEx(NORMAL, "Recorded Activity (TraceLen = %d bytes)", traceLen);
	PrintAndLogEx(NORMAL, "");
	if (protocol == FELICA) {
		printFelica(traceLen, trace);
	} else { 
		PrintAndLogEx(NORMAL, "Start = Start of Start Bit, End = End of last modulation. Src = Source of Transfer");
		if ( protocol == ISO_14443A || protocol == PROTO_MIFARE)
			PrintAndLogEx(NORMAL, "iso14443a - All times are in carrier periods (1/13.56Mhz)");
		if ( protocol == ICLASS )
			PrintAndLogEx(NORMAL, "iClass - Timings are not as accurate");
		if ( protocol == LEGIC )
			PrintAndLogEx(NORMAL, "LEGIC - Timings are in ticks (1us == 1.5ticks)");
		if ( protocol == ISO_15693 )
			PrintAndLogEx(NORMAL, "ISO15693 - Timings are not as accurate");
		if ( protocol == FELICA )
			PrintAndLogEx(NORMAL, "ISO18092 / FeliCa - Timings are not as accurate");	
		
		PrintAndLogEx(NORMAL, "");
		PrintAndLogEx(NORMAL, "      Start |        End | Src | Data (! denotes parity error)                                           | CRC | Annotation");
		PrintAndLogEx(NORMAL, "------------+------------+-----+-------------------------------------------------------------------------+-----+--------------------");

		ClearAuthData();
		while (tracepos < traceLen) {
			tracepos = printTraceLine(tracepos, traceLen, trace, protocol, showWaitCycles, markCRCBytes);
		}
	}
	return 0;
}

int CmdTraceLoad(const char *Cmd) {
	
	FILE *f = NULL;
	char filename[FILE_PATH_SIZE];
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) < 1 || cmdp == 'h' || cmdp == 'H') return usage_trace_load();	
	
	param_getstr(Cmd, 0, filename, sizeof(filename));	
	
	if ((f = fopen(filename, "rb")) == NULL) { 
		PrintAndLogEx(FAILED, "Could not open file %s", filename);
		return 0;
	}
	
	// get filesize in order to malloc memory
	fseek(f, 0, SEEK_END);
	long fsize = ftell(f);
	fseek(f, 0, SEEK_SET);	
	
	if (fsize < 0) 	{
		PrintAndLogEx(FAILED, "error, when getting filesize");
		fclose(f);
		return 3;
	}
	if (fsize < 4 ) 	{
		PrintAndLogEx(FAILED, "error, file is too small");
		fclose(f);
		return 4;
	}	

	if ( trace )
		free(trace);

	trace = calloc(fsize, sizeof(uint8_t));
	if (!trace) {
		PrintAndLogEx(FAILED, "Cannot allocate memory for trace");
		fclose(f);		
		return 2;
	}
	
	size_t bytes_read = fread(trace, 1, fsize, f);
	traceLen = bytes_read;
	fclose(f);
	PrintAndLogEx(SUCCESS, "Recorded Activity (TraceLen = %d bytes) loaded from file %s", traceLen, filename);	
	return 0;
}

int CmdTraceSave(const char *Cmd) {
	
	if (traceLen == 0 ) {
		PrintAndLogEx(WARNING, "trace is empty, exiting...");
		return 0;
	}
	
	char filename[FILE_PATH_SIZE];
	char cmdp = param_getchar(Cmd, 0);
	if (strlen(Cmd) < 1 || cmdp == 'h' || cmdp == 'H') return usage_trace_save();
	
	param_getstr(Cmd, 0, filename, sizeof(filename));		
	saveFile(filename, "bin", trace, traceLen);
	return 0;
}

static command_t CommandTable[] = {
	{"help",	CmdHelp,          1, "This help"},
	{"list",    CmdTraceList,     1, "List protocol data in trace buffer"},	
	{"load",	CmdTraceLoad,     1, "Load trace from file"},
	{"save",	CmdTraceSave,     1, "Save trace buffer to file"},
	{NULL, NULL, 0, NULL}
};

int CmdTrace(const char *Cmd) {
	clearCommandBuffer();
	CmdsParse(CommandTable, Cmd);
	return 0; 
}

int CmdHelp(const char *Cmd) {
	CmdsHelp(CommandTable);
	return 0;
}