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https://gitea.osmocom.org/sim-card/simtrace2.git
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45ad62d8d4
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. Change-Id: I0597ec723cb2225540c89c3821b91d8a45adfcd6
141 lines
4.9 KiB
C
141 lines
4.9 KiB
C
/*
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* (C) 2010-2017 by Harald Welte <hwelte@sysmocom.de>
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* (C) 2018 by Kevin Redon <kredon@sysmocom.de>
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* All Rights Reserved
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "board.h"
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#include "simtrace.h"
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#ifdef HAVE_SNIFFER
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/*------------------------------------------------------------------------------
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* Headers
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*------------------------------------------------------------------------------*/
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#include <string.h>
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/*------------------------------------------------------------------------------
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* Internal definitions
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*------------------------------------------------------------------------------*/
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/** Maximum ucSize in bytes of the smartcard answer to a command.*/
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#define MAX_ANSWER_SIZE 10
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/** Maximum ATR ucSize in bytes.*/
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#define MAX_ATR_SIZE 55
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/*------------------------------------------------------------------------------
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* Internal variables
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*------------------------------------------------------------------------------*/
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/* Pin configuration to sniff communication (using USART connection to SIM card) */
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static const Pin pins_sniff[] = { PINS_SIM_SNIFF_SIM };
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/* Connect phone to card using bus switch */
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static const Pin pins_bus[] = { PINS_BUS_SNIFF };
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/* Power card using phone VCC */
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static const Pin pins_power[] = { PWR_PINS };
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/* Timer Counter pins to measure ETU timing */
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static const Pin pins_tc[] = { PINS_TC };
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/* USART peripheral used to sniff communication */
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static struct Usart_info sniff_usart = {
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.base = USART_SIM,
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.id = ID_USART_SIM,
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.state = USART_RCV,
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};
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/* Ring buffer to store sniffer communication data */
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static struct ringbuf sniff_buffer;
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/*------------------------------------------------------------------------------
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* Global functions
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*------------------------------------------------------------------------------*/
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void Sniffer_usart0_irq(void)
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{
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/* Read channel status register */
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uint32_t csr = sniff_usart.base->US_CSR & sniff_usart.base->US_IMR;
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/* Verify if character has been received */
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if (csr & US_CSR_RXRDY) {
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/* Read communication data byte between phone and SIM */
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uint8_t byte = sniff_usart.base->US_RHR;
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/* Store sniffed data into buffer (also clear interrupt */
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rbuf_write(&sniff_buffer, byte);
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}
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}
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/*------------------------------------------------------------------------------
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* Internal functions
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*------------------------------------------------------------------------------*/
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static void check_sniffed_data(void)
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{
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/* Display sniffed data */
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while (!rbuf_is_empty(&sniff_buffer)) {
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uint8_t byte = rbuf_read(&sniff_buffer);
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TRACE_INFO_WP("0x%02x ", byte);
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}
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}
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/*-----------------------------------------------------------------------------
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* Initialization routine
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*-----------------------------------------------------------------------------*/
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/* Called during USB enumeration after device is enumerated by host */
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void Sniffer_configure(void)
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{
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TRACE_INFO("Sniffer config\n\r");
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}
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/* called when *different* configuration is set by host */
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void Sniffer_exit(void)
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{
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TRACE_INFO("Sniffer exit\n\r");
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USART_DisableIt(sniff_usart.base, US_IER_RXRDY);
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/* NOTE: don't forget to set the IRQ according to the USART peripheral used */
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NVIC_DisableIRQ(USART0_IRQn);
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USART_SetReceiverEnabled(sniff_usart.base, 0);
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}
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/* called when *Sniffer* configuration is set by host */
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void Sniffer_init(void)
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{
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TRACE_INFO("Sniffer Init\n\r");
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/* Configure pins to sniff communication between phone and card */
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PIO_Configure(pins_sniff, PIO_LISTSIZE(pins_sniff));
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/* Configure pins to connect phone to card */
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PIO_Configure(pins_bus, PIO_LISTSIZE(pins_bus));
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/* Configure pins to forward phone power to card */
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PIO_Configure(pins_power, PIO_LISTSIZE(pins_power));
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/* Clear ring buffer containing the sniffed data */
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rbuf_reset(&sniff_buffer);
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/* Configure USART to as ISO-7816 slave communication to sniff communication */
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ISO7816_Init(&sniff_usart, CLK_SLAVE);
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/* Only receive data when sniffing */
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USART_SetReceiverEnabled(sniff_usart.base, 1);
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/* Enable interrupt to indicate when data has been received */
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USART_EnableIt(sniff_usart.base, US_IER_RXRDY);
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/* Enable interrupt requests for the USART peripheral (warning: use IRQ corresponding to USART) */
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NVIC_EnableIRQ(USART0_IRQn);
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}
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/* main (idle/busy) loop of this USB configuration */
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void Sniffer_run(void)
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{
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check_sniffed_data();
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}
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#endif /* HAVE_SNIFFER */
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