/*
* Proxmark send and receive commands
*
* Copyright (c) 2012, Roel Verdult
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holders nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* @file cmd.c
* @brief
*/
#include "cmd.h"
#include "crc16.h"
// Flags to tell where to add CRC on sent replies
bool reply_with_crc_on_usb = false;
bool reply_with_crc_on_fpc = true;
// "Session" flag, to tell via which interface next msgs should be sent: USB or FPC USART
bool reply_via_fpc = false;
#ifdef WITH_FPC_USART_HOST
extern void Dbprintf(const char *fmt, ...);
#define Dbprintf_usb(...) {\
bool tmp = reply_via_fpc;\
reply_via_fpc = false;\
Dbprintf(__VA_ARGS__);\
reply_via_fpc = tmp;}
#endif
int reply_old(uint64_t cmd, uint64_t arg0, uint64_t arg1, uint64_t arg2, void *data, size_t len) {
PacketResponseOLD txcmd;
for (size_t i = 0; i < sizeof(PacketResponseOLD); i++)
((uint8_t *)&txcmd)[i] = 0x00;
// Compose the outgoing command frame
txcmd.cmd = cmd;
txcmd.arg[0] = arg0;
txcmd.arg[1] = arg1;
txcmd.arg[2] = arg2;
// Add the (optional) content to the frame, with a maximum size of PM3_CMD_DATA_SIZE
if (data && len) {
len = MIN(len, PM3_CMD_DATA_SIZE);
for (size_t i = 0; i < len; i++) {
txcmd.d.asBytes[i] = ((uint8_t *)data)[i];
}
}
int result = PM3_EUNDEF;
// Send frame and make sure all bytes are transmitted
if (reply_via_fpc) {
#ifdef WITH_FPC_USART_HOST
result = usart_writebuffer_sync((uint8_t *)&txcmd, sizeof(PacketResponseOLD));
#else
return PM3_EDEVNOTSUPP;
#endif
} else {
result = usb_write((uint8_t *)&txcmd, sizeof(PacketResponseOLD));
}
return result;
}
static int reply_ng_internal(uint16_t cmd, int16_t status, uint8_t *data, size_t len, bool ng) {
PacketResponseNGRaw txBufferNG;
size_t txBufferNGLen;
// Compose the outgoing command frame
txBufferNG.pre.magic = RESPONSENG_PREAMBLE_MAGIC;
txBufferNG.pre.cmd = cmd;
txBufferNG.pre.status = status;
txBufferNG.pre.ng = ng;
if (len > PM3_CMD_DATA_SIZE) {
len = PM3_CMD_DATA_SIZE;
// overwrite status
txBufferNG.pre.status = PM3_EOVFLOW;
}
txBufferNG.pre.length = len;
// Add the (optional) content to the frame, with a maximum size of PM3_CMD_DATA_SIZE
if (data && len) {
for (size_t i = 0; i < len; i++) {
txBufferNG.data[i] = data[i];
}
}
PacketResponseNGPostamble *tx_post = (PacketResponseNGPostamble *)((uint8_t *)&txBufferNG + sizeof(PacketResponseNGPreamble) + len);
if ((reply_via_fpc && reply_with_crc_on_fpc) || ((!reply_via_fpc) && reply_with_crc_on_usb)) {
uint8_t first, second;
compute_crc(CRC_14443_A, (uint8_t *)&txBufferNG, sizeof(PacketResponseNGPreamble) + len, &first, &second);
tx_post->crc = (first << 8) + second;
} else {
tx_post->crc = RESPONSENG_POSTAMBLE_MAGIC;
}
txBufferNGLen = sizeof(PacketResponseNGPreamble) + len + sizeof(PacketResponseNGPostamble);
int result = PM3_EUNDEF;
// Send frame and make sure all bytes are transmitted
if (reply_via_fpc) {
#ifdef WITH_FPC_USART_HOST
result = usart_writebuffer_sync((uint8_t *)&txBufferNG, txBufferNGLen);
#else
return PM3_EDEVNOTSUPP;
#endif
} else {
result = usb_write((uint8_t *)&txBufferNG, txBufferNGLen);
}
return result;
}
int reply_ng(uint16_t cmd, int16_t status, uint8_t *data, size_t len) {
return reply_ng_internal(cmd, status, data, len, true);
}
int reply_mix(uint64_t cmd, uint64_t arg0, uint64_t arg1, uint64_t arg2, void *data, size_t len) {
uint16_t status = PM3_SUCCESS;
uint64_t arg[3] = {arg0, arg1, arg2};
if (len > PM3_CMD_DATA_SIZE - sizeof(arg)) {
len = PM3_CMD_DATA_SIZE - sizeof(arg);
status = PM3_EOVFLOW;
}
uint8_t cmddata[PM3_CMD_DATA_SIZE];
memcpy(cmddata, arg, sizeof(arg));
if (len && data)
memcpy(cmddata + sizeof(arg), data, len);
return reply_ng_internal(cmd, status, cmddata, len + sizeof(arg), false);
}
static int receive_ng_internal(PacketCommandNG *rx, uint32_t read_ng(uint8_t *data, size_t len), bool fpc) {
PacketCommandNGRaw rx_raw;
size_t bytes = read_ng((uint8_t *)&rx_raw.pre, sizeof(PacketCommandNGPreamble));
if (bytes == 0)
return PM3_ENODATA;
if (bytes != sizeof(PacketCommandNGPreamble))
return PM3_EIO;
rx->magic = rx_raw.pre.magic;
rx->ng = rx_raw.pre.ng;
uint16_t length = rx_raw.pre.length;
rx->cmd = rx_raw.pre.cmd;
if (rx->magic == COMMANDNG_PREAMBLE_MAGIC) { // New style NG command
if (length > PM3_CMD_DATA_SIZE)
return PM3_EOVFLOW;
// Get the core and variable length payload
bytes = read_ng((uint8_t *)&rx_raw.data, length);
if (bytes != length)
return PM3_EIO;
if (rx->ng) {
memcpy(rx->data.asBytes, rx_raw.data, length);
rx->length = length;
} else {
uint64_t arg[3];
if (length < sizeof(arg))
return PM3_EIO;
memcpy(arg, rx_raw.data, sizeof(arg));
rx->oldarg[0] = arg[0];
rx->oldarg[1] = arg[1];
rx->oldarg[2] = arg[2];
memcpy(rx->data.asBytes, rx_raw.data + sizeof(arg), length - sizeof(arg));
rx->length = length - sizeof(arg);
}
// Get the postamble
bytes = read_ng((uint8_t *)&rx_raw.foopost, sizeof(PacketCommandNGPostamble));
if (bytes != sizeof(PacketCommandNGPostamble))
return PM3_EIO;
// Check CRC, accept MAGIC as placeholder
rx->crc = rx_raw.foopost.crc;
if (rx->crc != COMMANDNG_POSTAMBLE_MAGIC) {
uint8_t first, second;
compute_crc(CRC_14443_A, (uint8_t *)&rx_raw, sizeof(PacketCommandNGPreamble) + length, &first, &second);
if ((first << 8) + second != rx->crc)
return PM3_EIO;
}
reply_via_fpc = fpc;
} else { // Old style command
PacketCommandOLD rx_old;
memcpy(&rx_old, &rx_raw.pre, sizeof(PacketCommandNGPreamble));
bytes = read_ng(((uint8_t *)&rx_old) + sizeof(PacketCommandNGPreamble), sizeof(PacketCommandOLD) - sizeof(PacketCommandNGPreamble));
if (bytes != sizeof(PacketCommandOLD) - sizeof(PacketCommandNGPreamble))
return PM3_EIO;
reply_via_fpc = fpc;
rx->ng = false;
rx->magic = 0;
rx->crc = 0;
rx->cmd = rx_old.cmd;
rx->oldarg[0] = rx_old.arg[0];
rx->oldarg[1] = rx_old.arg[1];
rx->oldarg[2] = rx_old.arg[2];
rx->length = PM3_CMD_DATA_SIZE;
memcpy(&rx->data, &rx_old.d.asBytes, rx->length);
}
return PM3_SUCCESS;
}
int receive_ng(PacketCommandNG *rx) {
// Check if there is a packet available
if (usb_poll_validate_length())
return receive_ng_internal(rx, usb_read_ng, false);
#ifdef WITH_FPC_USART_HOST
// Check if there is a FPC packet available
if (usart_rxdata_available() > 0)
return receive_ng_internal(rx, usart_read_ng, true);
#endif
return PM3_ENODATA;
}