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fix: 'hf mf sniff' - @merlokk 's adjustments

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iceman1001 2018-01-17 00:28:40 +01:00
parent de983252eb
commit b4afc8cdc4
1 changed files with 55 additions and 51 deletions
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106
armsrc/iso14443a.c
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@ -196,7 +196,7 @@ void UartReset() {
Uart.parityBits = 0; // holds 8 parity bits
Uart.startTime = 0;
Uart.endTime = 0;
Uart.fourBits = 0x00000000; // clear the buffer for 4 Bits
Uart.posCnt = 0;
Uart.syncBit = 9999;
}
@ -204,7 +204,6 @@ void UartReset() {
void UartInit(uint8_t *data, uint8_t *parity) {
Uart.output = data;
Uart.parity = parity;
Uart.fourBits = 0x00000000; // clear the buffer for 4 Bits
UartReset();
}
@ -252,14 +251,14 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) {
Uart.bitCount++;
Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg
Uart.state = STATE_MILLER_Z;
Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 6;
if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity)
Uart.endTime = Uart.startTime + 8 * (9 * Uart.len + Uart.bitCount + 1) - 6;
if (Uart.bitCount >= 9) { // if we decoded a full byte (including parity)
Uart.output[Uart.len++] = (Uart.shiftReg & 0xff);
Uart.parityBits <<= 1; // make room for the parity bit
Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit
Uart.bitCount = 0;
Uart.shiftReg = 0;
if((Uart.len&0x0007) == 0) { // every 8 data bytes
if ((Uart.len & 0x0007) == 0) { // every 8 data bytes
Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
Uart.parityBits = 0;
}
@ -271,14 +270,14 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) {
Uart.bitCount++;
Uart.shiftReg = (Uart.shiftReg >> 1) | 0x100; // add a 1 to the shiftreg
Uart.state = STATE_MILLER_X;
Uart.endTime = Uart.startTime + 8*(9*Uart.len + Uart.bitCount + 1) - 2;
if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity)
Uart.endTime = Uart.startTime + 8 * (9 * Uart.len + Uart.bitCount + 1) - 2;
if (Uart.bitCount >= 9) { // if we decoded a full byte (including parity)
Uart.output[Uart.len++] = (Uart.shiftReg & 0xff);
Uart.parityBits <<= 1; // make room for the new parity bit
Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit
Uart.bitCount = 0;
Uart.shiftReg = 0;
if ((Uart.len&0x0007) == 0) { // every 8 data bytes
if ((Uart.len & 0x0007) == 0) { // every 8 data bytes
Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
Uart.parityBits = 0;
}
@ -288,7 +287,7 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) {
Uart.state = STATE_UNSYNCD;
Uart.bitCount--; // last "0" was part of EOC sequence
Uart.shiftReg <<= 1; // drop it
if(Uart.bitCount > 0) { // if we decoded some bits
if (Uart.bitCount > 0) { // if we decoded some bits
Uart.shiftReg >>= (9 - Uart.bitCount); // right align them
Uart.output[Uart.len++] = (Uart.shiftReg & 0xff); // add last byte to the output
Uart.parityBits <<= 1; // add a (void) parity bit
@ -311,13 +310,13 @@ static RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time) {
Uart.bitCount++;
Uart.shiftReg = (Uart.shiftReg >> 1); // add a 0 to the shiftreg
Uart.state = STATE_MILLER_Y;
if(Uart.bitCount >= 9) { // if we decoded a full byte (including parity)
if (Uart.bitCount >= 9) { // if we decoded a full byte (including parity)
Uart.output[Uart.len++] = (Uart.shiftReg & 0xff);
Uart.parityBits <<= 1; // make room for the parity bit
Uart.parityBits |= ((Uart.shiftReg >> 8) & 0x01); // store parity bit
Uart.bitCount = 0;
Uart.shiftReg = 0;
if ((Uart.len&0x0007) == 0) { // every 8 data bytes
if ((Uart.len & 0x0007) == 0) { // every 8 data bytes
Uart.parity[Uart.parityLen++] = Uart.parityBits; // store 8 parity bits
Uart.parityBits = 0;
}
@ -363,7 +362,7 @@ void DemodReset() {
Demod.shiftReg = 0; // shiftreg to hold decoded data bits
Demod.parityBits = 0; //
Demod.collisionPos = 0; // Position of collision bit
Demod.twoBits = 0xffff; // buffer for 2 Bits
Demod.twoBits = 0xFFFF; // buffer for 2 Bits
Demod.highCnt = 0;
Demod.startTime = 0;
Demod.endTime = 0;
@ -417,34 +416,34 @@ static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non
} // modulation in first half only - Sequence D = 1
Demod.bitCount++;
Demod.shiftReg = (Demod.shiftReg >> 1) | 0x100; // in both cases, add a 1 to the shiftreg
if(Demod.bitCount == 9) { // if we decoded a full byte (including parity)
if (Demod.bitCount == 9) { // if we decoded a full byte (including parity)
Demod.output[Demod.len++] = (Demod.shiftReg & 0xff);
Demod.parityBits <<= 1; // make room for the parity bit
Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit
Demod.bitCount = 0;
Demod.shiftReg = 0;
if((Demod.len&0x0007) == 0) { // every 8 data bytes
if ((Demod.len & 0x0007) == 0) { // every 8 data bytes
Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits
Demod.parityBits = 0;
}
}
Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1) - 4;
Demod.endTime = Demod.startTime + 8 * (9 * Demod.len + Demod.bitCount + 1) - 4;
} else { // no modulation in first half
if (IsManchesterModulationNibble2(Demod.twoBits >> Demod.syncBit)) { // and modulation in second half = Sequence E = 0
Demod.bitCount++;
Demod.shiftReg = (Demod.shiftReg >> 1); // add a 0 to the shiftreg
if(Demod.bitCount >= 9) { // if we decoded a full byte (including parity)
if (Demod.bitCount >= 9) { // if we decoded a full byte (including parity)
Demod.output[Demod.len++] = (Demod.shiftReg & 0xff);
Demod.parityBits <<= 1; // make room for the new parity bit
Demod.parityBits |= ((Demod.shiftReg >> 8) & 0x01); // store parity bit
Demod.bitCount = 0;
Demod.shiftReg = 0;
if ((Demod.len&0x0007) == 0) { // every 8 data bytes
if ((Demod.len & 0x0007) == 0) { // every 8 data bytes
Demod.parity[Demod.parityLen++] = Demod.parityBits; // store 8 parity bits1
Demod.parityBits = 0;
}
}
Demod.endTime = Demod.startTime + 8*(9*Demod.len + Demod.bitCount + 1);
Demod.endTime = Demod.startTime + 8 * (9 * Demod.len + Demod.bitCount + 1);
} else { // no modulation in both halves - End of communication
if(Demod.bitCount > 0) { // there are some remaining data bits
Demod.shiftReg >>= (9 - Demod.bitCount); // right align the decoded bits
@ -464,8 +463,7 @@ static RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non
}
}
}
}
}
return false; // not finished yet, need more data
}
@ -569,7 +567,8 @@ void RAMFUNC SniffIso14443a(uint8_t param) {
LED_A_OFF();
if (rsamples & 0x01) { // Need two samples to feed Miller and Manchester-Decoder
// Need two samples to feed Miller and Manchester-Decoder
if (rsamples & 0x01) {
if (!TagIsActive) { // no need to try decoding reader data if the tag is sending
uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4);
@ -615,7 +614,8 @@ void RAMFUNC SniffIso14443a(uint8_t param) {
// ready to receive another response.
DemodReset();
// reset the Miller decoder including its (now outdated) input buffer
UartInit(receivedCmd, receivedCmdPar);
UartReset();
//UartInit(receivedCmd, receivedCmdPar);
LED_C_OFF();
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
@ -3374,10 +3374,16 @@ void Mifare1ksim(uint8_t flags, uint8_t exitAfterNReads, uint8_t arg2, uint8_t *
//-----------------------------------------------------------------------------
// "hf mf sniff"
void RAMFUNC SniffMifare(uint8_t param) {
// param:
// bit 0 - trigger from first card answer
// bit 1 - trigger from first reader 7-bit request
// C(red) A(yellow) B(green)
LEDsoff();
// free eventually allocated BigBuf memory
iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
// Allocate memory from BigBuf for some buffers
// free all previous allocations first
BigBuf_free(); BigBuf_Clear_ext(false);
clear_trace();
set_tracing(true);
@ -3390,10 +3396,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
uint8_t receivedResponse[MAX_MIFARE_FRAME_SIZE] = {0x00};
uint8_t receivedResponsePar[MAX_MIFARE_PARITY_SIZE] = {0x00};
iso14443a_setup(FPGA_HF_ISO14443A_SNIFFER);
// allocate the DMA buffer, used to stream samples from the FPGA
// [iceman] is this sniffed data unsigned?
uint8_t *dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
uint8_t *data = dmaBuf;
uint8_t previous_data = 0;
@ -3411,7 +3414,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
// Setup and start DMA.
// set transfer address and number of bytes. Start transfer.
if ( !FpgaSetupSscDma(dmaBuf, DMA_BUFFER_SIZE) ){
if (MF_DBGLEVEL > 1) Dbprintf("[-] FpgaSetupSscDma failed. Exiting");
if (MF_DBGLEVEL > 1) Dbprintf("[!] FpgaSetupSscDma failed. Exiting");
return;
}
@ -3426,22 +3429,23 @@ void RAMFUNC SniffMifare(uint8_t param) {
WDT_HIT();
LED_A_ON();
if ((sniffCounter & 0x0000FFFF) == 0) { // from time to time
if ((sniffCounter & 0xFFFF) == 0) { // from time to time
// check if a transaction is completed (timeout after 2000ms).
// if yes, stop the DMA transfer and send what we have so far to the client
if (MfSniffSend(2000)) {
// Reset everything - we missed some sniffed data anyway while the DMA was stopped
sniffCounter = 0;
dmaBuf = BigBuf_malloc(DMA_BUFFER_SIZE);
data = dmaBuf;
maxDataLen = 0;
ReaderIsActive = false;
TagIsActive = false;
// Setup and start DMA. set transfer address and number of bytes. Start transfer.
// Setup and start DMA. set transfer address and number of bytes. Start transfer.
if ( !FpgaSetupSscDma(dmaBuf, DMA_BUFFER_SIZE) ){
if (MF_DBGLEVEL > 1) DbpString("[-] FpgaSetupSscDma failed. Exiting");
if (MF_DBGLEVEL > 1) DbpString("[!] FpgaSetupSscDma failed. Exiting");
return;
}
}
}
}
@ -3459,7 +3463,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
if (dataLen > maxDataLen) { // we are more behind than ever...
maxDataLen = dataLen;
if (dataLen > (9 * DMA_BUFFER_SIZE / 10)) {
Dbprintf("[-] blew circular buffer! dataLen=0x%x", dataLen);
Dbprintf("[!] blew circular buffer! | datalen %u", dataLen);
break;
}
}
@ -3469,7 +3473,7 @@ void RAMFUNC SniffMifare(uint8_t param) {
if (!AT91C_BASE_PDC_SSC->PDC_RCR) {
AT91C_BASE_PDC_SSC->PDC_RPR = (uint32_t)dmaBuf;
AT91C_BASE_PDC_SSC->PDC_RCR = DMA_BUFFER_SIZE;
Dbprintf("[-] RxEmpty ERROR, data length:%d", dataLen); // temporary
Dbprintf("[-] RxEmpty ERROR | data length %u", dataLen); // temporary
}
// secondary buffer sets as primary, secondary buffer was stopped
if (!AT91C_BASE_PDC_SSC->PDC_RNCR) {
@ -3478,38 +3482,38 @@ void RAMFUNC SniffMifare(uint8_t param) {
}
LED_A_OFF();
// Need two samples to feed Miller and Manchester-Decoder
if (sniffCounter & 0x01) {
// no need to try decoding tag data if the reader is sending
if (!TagIsActive) {
uint8_t readerdata = (previous_data & 0xF0) | (*data >> 4);
if (MillerDecoding(readerdata, (sniffCounter-1)*4)) {
LED_C_INV();
if (MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, true)) break;
uint8_t readerbyte = (previous_data & 0xF0) | (*data >> 4);
if (MillerDecoding(readerbyte, (sniffCounter-1)*4)) {
LED_B_ON();
LED_C_OFF();
MfSniffLogic(receivedCmd, Uart.len, Uart.parity, Uart.bitCount, true);
DemodReset();
UartInit(receivedCmd, receivedCmdPar);
UartReset();
}
ReaderIsActive = (Uart.state != STATE_UNSYNCD);
TagIsActive = !ReaderIsActive;
}
// no need to try decoding tag data if the reader is sending
if (!ReaderIsActive) {
uint8_t tagdata = (previous_data << 4) | (*data & 0x0F);
if (ManchesterDecoding(tagdata, 0, (sniffCounter-1)*4)) {
LED_C_INV();
if (MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, false)) break;
uint8_t tagbyte = (previous_data << 4) | (*data & 0x0F);
if (ManchesterDecoding(tagbyte, 0, (sniffCounter-1)*4)) {
LED_B_OFF();
LED_C_ON();
MfSniffLogic(receivedResponse, Demod.len, Demod.parity, Demod.bitCount, false);
DemodReset();
UartInit(receivedCmd, receivedCmdPar);
UartReset();
}
TagIsActive = (Demod.state != DEMOD_UNSYNCD);
ReaderIsActive = !TagIsActive;
}
}
previous_data = *data;
sniffCounter++;
data++;