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sniff: use USART 0 instead of USART 1

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Use USART 0 connected to the SIM card side to sniff the communication.
The card side can also measure ETU times.
Do proper pin initialization.
This code can already capture the ATR communication between phone and card.
This commit is contained in:
Kévin Redon
2018-06-07 18:56:41 +02:00
parent 7f4f8983dd
commit d0b4a9da81
4 changed files with 65 additions and 70 deletions
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109
firmware/libcommon/source/sniffer.c
View File

@@ -1,32 +1,22 @@
/* ----------------------------------------------------------------------------
* ATMEL Microcontroller Software Support
* ----------------------------------------------------------------------------
* Copyright (c) 2009, Atmel Corporation
/*
* (C) 2010-2017 by Harald Welte <hwelte@sysmocom.de>
* (C) 2018 by Kevin Redon <kredon@sysmocom.de>
* All Rights Reserved
*
* All rights reserved.
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* - Redistributions of source code must retain the above copyright notice,
* this list of conditions and the disclaimer below.
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Atmel's name may not be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* DISCLAIMER: THIS SOFTWARE IS PROVIDED BY ATMEL "AS IS" AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT ARE
* DISCLAIMED. IN NO EVENT SHALL ATMEL 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.
* ----------------------------------------------------------------------------
*/
#include "board.h"
#include "simtrace.h"
@@ -47,27 +37,24 @@
/** Maximum ATR ucSize in bytes.*/
#define MAX_ATR_SIZE 55
/*------------------------------------------------------------------------------
* Internal variables
*------------------------------------------------------------------------------*/
/** ISO7816 pins */
static const Pin pinsISO7816_sniff[] = { PINS_SIM_SNIFF_SIM };
/* Pin configuration to sniff communication (using USART connection to SIM card) */
static const Pin pins_sniff[] = { PINS_SIM_SNIFF_SIM };
/* Connect phone to card using bus switch */
static const Pin pins_bus[] = { PINS_BUS_SNIFF };
static const Pin pPwr[] = {
/* Enable power converter 4.5-6V to 3.3V; low: off */
{SIM_PWEN, PIOA, ID_PIOA, PIO_OUTPUT_0, PIO_DEFAULT},
/* Enable power forwarding: VCC_PHONE to VCC_SIM; high: on */
{VCC_FWD, PIOA, ID_PIOA, PIO_OUTPUT_1, PIO_DEFAULT}
};
static struct Usart_info usart_info = {
.base = USART_PHONE,
.id = ID_USART_PHONE,
/* Power card using phone VCC */
static const Pin pins_power[] = { PWR_PINS };
/* Timer Counter pins to measure ETU timing */
static const Pin pins_tc[] = { PINS_TC };
/* USART peripheral used to sniff communication */
static struct Usart_info sniff_usart = {
.base = USART_SIM,
.id = ID_USART_SIM,
.state = USART_RCV,
};
/* Ring buffer to store sniffer communication data */
static struct ringbuf sniff_buffer;
@@ -75,14 +62,14 @@ static struct ringbuf sniff_buffer;
* Global functions
*------------------------------------------------------------------------------*/
void Sniffer_usart1_irq(void)
void Sniffer_usart0_irq(void)
{
/* Read channel status register */
uint32_t csr = usart_info.base->US_CSR & usart_info.base->US_IMR;
uint32_t csr = sniff_usart.base->US_CSR & sniff_usart.base->US_IMR;
/* Verify if character has been received */
if (csr & US_CSR_RXRDY) {
/* Read communication data byte between phone and SIM */
uint8_t byte = usart_info.base->US_RHR;
uint8_t byte = sniff_usart.base->US_RHR;
/* Store sniffed data into buffer (also clear interrupt */
rbuf_write(&sniff_buffer, byte);
}
@@ -92,7 +79,7 @@ void Sniffer_usart1_irq(void)
* Internal functions
*------------------------------------------------------------------------------*/
int check_data_from_phone(void)
static void check_sniffed_data(void)
{
/* Display sniffed data */
while (!rbuf_is_empty(&sniff_buffer)) {
@@ -115,9 +102,10 @@ void Sniffer_configure(void)
void Sniffer_exit(void)
{
TRACE_INFO("Sniffer exit\n\r");
USART_DisableIt(USART_PHONE, US_IER_RXRDY);
NVIC_DisableIRQ(USART1_IRQn);
USART_SetReceiverEnabled(USART_PHONE, 0);
USART_DisableIt(sniff_usart.base, US_IER_RXRDY);
/* NOTE: don't forget to set the IRQ according to the USART peripheral used */
NVIC_DisableIRQ(USART0_IRQn);
USART_SetReceiverEnabled(sniff_usart.base, 0);
}
/* called when *Sniffer* configuration is set by host */
@@ -125,25 +113,28 @@ void Sniffer_init(void)
{
TRACE_INFO("Sniffer Init\n\r");
/* Configure pins to sniff communication between phone and card */
PIO_Configure(pins_sniff, PIO_LISTSIZE(pins_sniff));
/* Configure pins to connect phone to card */
PIO_Configure(pins_bus, PIO_LISTSIZE(pins_bus));
/* Configure pins to forward phone power to card */
PIO_Configure(pins_power, PIO_LISTSIZE(pins_power));
/* Clear ring buffer containing the sniffed data */
rbuf_reset(&sniff_buffer);
/* Configure ISO7816 driver */
PIO_Configure(pinsISO7816_sniff, PIO_LISTSIZE(pinsISO7816_sniff));
PIO_Configure(pins_bus, PIO_LISTSIZE(pins_bus));
PIO_Configure(pPwr, PIO_LISTSIZE(pPwr));
ISO7816_Init(&usart_info, CLK_SLAVE);
USART_SetReceiverEnabled(USART_PHONE, 1);
USART_EnableIt(USART_PHONE, US_IER_RXRDY);
NVIC_EnableIRQ(USART1_IRQn);
/* Configure USART to as ISO-7816 slave communication to sniff communication */
ISO7816_Init(&sniff_usart, CLK_SLAVE);
/* Only receive data when sniffing */
USART_SetReceiverEnabled(sniff_usart.base, 1);
/* Enable interrupt to indicate when data has been received */
USART_EnableIt(sniff_usart.base, US_IER_RXRDY);
/* Enable interrupt requests for the USART peripheral (warning: use IRQ corresponding to USART) */
NVIC_EnableIRQ(USART0_IRQn);
}
/* main (idle/busy) loop of this USB configuration */
void Sniffer_run(void)
{
check_data_from_phone();
check_sniffed_data();
}
#endif /* HAVE_SNIFFER */