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/* simtrace - main program for the host PC
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*
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* (C) 2010 by Harald Welte <hwelte@hmw-consulting.de>
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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 General Public License version 2
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* as published by the Free Software Foundation
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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 General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <errno.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <time.h>
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#include <assert.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include "apdu_split.h"
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enum iso7816_apdu_state {
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APDU_S_CLA,
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APDU_S_INS,
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APDU_S_P1,
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APDU_S_P2,
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APDU_S_P3,
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APDU_S_DATA,
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APDU_S_DATA_SINGLE,
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APDU_S_SW1,
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APDU_S_SW2,
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};
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const char *state_names[] = {
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[APDU_S_CLA] = "CLA",
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[APDU_S_INS] = "INS",
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[APDU_S_P1] = "P1",
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[APDU_S_P2] = "P2",
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[APDU_S_P3] = "P3",
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[APDU_S_DATA] = "DATA",
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[APDU_S_SW1] = "SW1",
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[APDU_S_SW2] = "SW2",
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};
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struct apdu_split {
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apdu_cb_t *apdu_out_cb;
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void *user_data;
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enum iso7816_apdu_state state;
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uint8_t apdu_ins;
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unsigned int apdu_len;
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unsigned int apdu_data_remaining;
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uint8_t apdu_buf[(2<<16)];
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};
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/* wrapper function to catch apdu_buf overflows */
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static void apdu_buf_append(struct apdu_split *as, uint8_t ch)
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{
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assert(as->apdu_len < sizeof(as->apdu_buf));
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as->apdu_buf[as->apdu_len++] = ch;
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}
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static void set_state(struct apdu_split *as, enum iso7816_apdu_state new_state)
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{
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switch (new_state) {
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case APDU_S_CLA:
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as->apdu_len = 0;
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memset(as->apdu_buf, 0, sizeof(as->apdu_buf));
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break;
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}
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if (as->state == new_state)
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return;
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//printf("APDU split state %s -> %s\n", state_names[as->state], state_names[new_state]);
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as->state = new_state;
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}
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static void apdu_split_inbyte(struct apdu_split *as, uint8_t ch)
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{
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switch (as->state) {
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case APDU_S_INS:
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as->apdu_ins = ch;
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case APDU_S_CLA:
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case APDU_S_P1:
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case APDU_S_P2:
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apdu_buf_append(as, ch);
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set_state(as, as->state+1);
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break;
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case APDU_S_P3:
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apdu_buf_append(as, ch);
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as->apdu_data_remaining = (ch == 0 ? 256 : ch);
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set_state(as, APDU_S_SW1);
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break;
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case APDU_S_DATA:
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apdu_buf_append(as, ch);
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as->apdu_data_remaining--;
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if (as->apdu_data_remaining == 0)
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set_state(as, APDU_S_SW1);
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break;
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case APDU_S_DATA_SINGLE:
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apdu_buf_append(as, ch);
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as->apdu_data_remaining--;
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set_state(as, APDU_S_SW1);
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break;
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case APDU_S_SW1:
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/* check for NULL / waiting time extension */
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if (ch == 0x60) {
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//printf("NULL");
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} else
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/* check for 'all remaining' type ACK */
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if (ch == as->apdu_ins || ch == as->apdu_ins + 1 ||
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ch == ~(as->apdu_ins+1)) {
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//printf("ACK");
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set_state(as, APDU_S_DATA);
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} else
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/* check for 'only next byte' type ACK */
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if (ch == ~(as->apdu_ins)) {
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set_state(as, APDU_S_DATA_SINGLE);
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} else {
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/* must be SW1 */
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apdu_buf_append(as, ch);
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set_state(as, APDU_S_SW2);
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}
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break;
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case APDU_S_SW2:
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apdu_buf_append(as, ch);
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//printf("APDU: %s\n", osmo_hexdump(as->apdu_buf, as->apdu_len));
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as->apdu_out_cb(as->apdu_buf, as->apdu_len, as->user_data);
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set_state(as, APDU_S_CLA);
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break;
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}
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}
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/* public API */
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struct apdu_split *apdu_split_init(apdu_cb_t *apdu_out_cb, void *user_data)
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{
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struct apdu_split *as;
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as = malloc(sizeof(*as));
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if (!as)
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return NULL;
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memset(as, 0, sizeof(*as));
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as->apdu_out_cb = apdu_out_cb;
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as->user_data = user_data;
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return as;
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}
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int apdu_split_reset(struct apdu_split *as)
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{
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set_state(as, APDU_S_CLA);
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}
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void apdu_split_boundary(struct apdu_split *as)
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{
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printf("BOUNDARY\n");
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as->apdu_out_cb(as->apdu_buf, as->apdu_len, as->user_data);
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set_state(as, APDU_S_CLA);
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}
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void apdu_split_in(struct apdu_split *as, uint8_t *buf, int len)
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{
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while (len--)
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apdu_split_inbyte(as, *buf++);
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}
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