FreeCalypso > hg > fc-sim-sniff

annotate sw/sniff-dec/command.c @ 56:966a54303d68

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simsniff-dec: factor out high-level decoding
author Mychaela Falconia <falcon@freecalypso.org>
date Wed, 04 Oct 2023 01:18:50 +0000
parents 5268246520de
children eb4274e7f4da
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1 /*
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2 * Here we implement decoding of command APDU exchanges.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <stdio.h>
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7 #include <stdlib.h>
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8 #include <string.h>
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9 #include <strings.h>
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10 #include "state.h"
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11
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12 extern char linebuf[];
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13 extern int lineno;
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14 extern unsigned rx_byte;
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15 extern int state;
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16
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17 static char cmd_start_timestamp[18];
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18 static int cmd_start_line;
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19 static char data_start_timestamp[18];
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20 static int data_start_line;
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21 static char sw1_timestamp[18];
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22 static int sw1_line;
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23
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24 static u_char cmd_hdr[5];
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25 static unsigned hdr_byte_count;
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26 static unsigned data_total, data_sofar, data_thistime;
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27 static u_char data_buf[256], sw1;
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28
41
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29 void
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30 start_cmd_header()
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31 {
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32 strcpy(cmd_start_timestamp, linebuf);
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33 cmd_start_line = lineno;
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34 cmd_hdr[0] = rx_byte;
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35 hdr_byte_count = 1;
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36 state = STATE_CMD_HDR;
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37 }
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38
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39 static void
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40 print_cmd_hdr()
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41 {
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42 unsigned n;
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43
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44 printf("%s line %d: CMD", cmd_start_timestamp, cmd_start_line);
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45 for (n = 0; n < 5; n++)
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46 printf(" %02X", cmd_hdr[n]);
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47 putchar('\n');
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48 }
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49
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50 void
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51 cmd_hdr_byte_in()
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52 {
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53 cmd_hdr[hdr_byte_count++] = rx_byte;
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54 if (hdr_byte_count < 5)
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55 return;
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56 print_cmd_hdr();
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57 if ((cmd_hdr[1] & 0xF0) == 0x60 || (cmd_hdr[1] & 0xF0) == 0x90) {
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58 printf(" ERROR: INS byte is invalid!\n");
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59 state = STATE_ERROR;
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60 return;
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61 }
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62 decode_cmd_opcode(cmd_hdr[1]);
45
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63 if (cmd_hdr[4])
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64 data_total = cmd_hdr[4];
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65 else
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66 data_total = 256;
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67 data_sofar = 0;
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68 state = STATE_CMD_PROC;
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69 }
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70
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71 static void
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72 print_data()
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73 {
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74 unsigned n;
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75
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76 printf("%s line %d: DATA\n", data_start_timestamp, data_start_line);
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77 for (n = 0; n < data_sofar; n++) {
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78 printf(" %02X", data_buf[n]);
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79 if ((n & 15) == 15 || n == data_sofar - 1)
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80 putchar('\n');
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81 }
41
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82 }
45
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83
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84 static void
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85 handle_sw1()
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86 {
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87 strcpy(sw1_timestamp, linebuf);
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88 sw1_line = lineno;
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89 sw1 = rx_byte;
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90 if (data_sofar)
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91 print_data();
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92 state = STATE_CMD_SW;
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93 }
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94
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95 void
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96 handle_ack(single)
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97 {
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98 if (data_sofar >= data_total) {
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99 printf("%s line %d: ERROR: ACK for more data than possible\n",
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100 linebuf, lineno);
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101 state = STATE_ERROR;
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102 return;
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103 }
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104 if (!data_sofar) {
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105 strcpy(data_start_timestamp, linebuf);
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106 data_start_line = lineno;
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107 }
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108 if (single)
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109 data_thistime = 1;
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110 else
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111 data_thistime = data_total - data_sofar;
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112 state = STATE_CMD_DATA;
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113 }
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114
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115 void
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116 cmd_proc_byte_in()
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117 {
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118 if (rx_byte == 0x60)
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119 return;
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120 if ((rx_byte & 0xF0) == 0x60 || (rx_byte & 0xF0) == 0x90) {
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121 handle_sw1();
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122 return;
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123 }
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124 if (rx_byte == cmd_hdr[1]) {
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125 handle_ack(0);
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126 return;
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127 }
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128 if (rx_byte == (cmd_hdr[1] ^ 0xFF)) {
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129 handle_ack(1);
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130 return;
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131 }
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132 printf("%s line %d: ERROR: invalid procedure byte\n", linebuf, lineno);
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133 state = STATE_ERROR;
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134 }
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135
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136 void
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137 cmd_data_byte_in()
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138 {
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139 data_buf[data_sofar++] = rx_byte;
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140 data_thistime--;
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141 if (data_thistime)
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142 return;
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143 state = STATE_CMD_PROC;
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144 }
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145
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146 void
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147 cmd_sw2_byte_in()
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148 {
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149 printf("%s line %d: SW %02X %02X\n", sw1_timestamp, sw1_line, sw1,
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150 rx_byte);
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151 state = STATE_READY_FOR_CMD;
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152 }