FreeCalypso > hg > fc-sim-sniff

annotate sw/sniff-dec/command.c @ 45:b0524d1dc6ef

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simtrace3-sniff-dec: implement command decoding
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 31 Aug 2023 09:32:48 +0000
parents 118a12e9483b
children 5268246520de
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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 if (cmd_hdr[4])
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63 data_total = cmd_hdr[4];
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64 else
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65 data_total = 256;
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66 data_sofar = 0;
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67 state = STATE_CMD_PROC;
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68 }
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69
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70 static void
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71 print_data()
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72 {
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73 unsigned n;
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74
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75 printf("%s line %d: DATA\n", data_start_timestamp, data_start_line);
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76 for (n = 0; n < data_sofar; n++) {
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77 printf(" %02X", data_buf[n]);
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78 if ((n & 15) == 15 || n == data_sofar - 1)
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79 putchar('\n');
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80 }
41
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81 }
45
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82
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83 static void
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84 handle_sw1()
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85 {
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86 strcpy(sw1_timestamp, linebuf);
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87 sw1_line = lineno;
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88 sw1 = rx_byte;
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89 if (data_sofar)
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90 print_data();
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91 state = STATE_CMD_SW;
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92 }
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93
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94 void
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95 handle_ack(single)
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96 {
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97 if (data_sofar >= data_total) {
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98 printf("%s line %d: ERROR: ACK for more data than possible\n",
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99 linebuf, lineno);
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100 state = STATE_ERROR;
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101 return;
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102 }
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103 if (!data_sofar) {
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104 strcpy(data_start_timestamp, linebuf);
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105 data_start_line = lineno;
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106 }
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107 if (single)
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108 data_thistime = 1;
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109 else
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110 data_thistime = data_total - data_sofar;
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111 state = STATE_CMD_DATA;
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112 }
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113
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114 void
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115 cmd_proc_byte_in()
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116 {
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117 if (rx_byte == 0x60)
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118 return;
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119 if ((rx_byte & 0xF0) == 0x60 || (rx_byte & 0xF0) == 0x90) {
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120 handle_sw1();
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121 return;
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122 }
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123 if (rx_byte == cmd_hdr[1]) {
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124 handle_ack(0);
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125 return;
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126 }
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127 if (rx_byte == (cmd_hdr[1] ^ 0xFF)) {
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128 handle_ack(1);
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129 return;
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130 }
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131 printf("%s line %d: ERROR: invalid procedure byte\n", linebuf, lineno);
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132 state = STATE_ERROR;
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133 }
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134
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135 void
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136 cmd_data_byte_in()
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137 {
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138 data_buf[data_sofar++] = rx_byte;
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139 data_thistime--;
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140 if (data_thistime)
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141 return;
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142 state = STATE_CMD_PROC;
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143 }
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144
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145 void
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146 cmd_sw2_byte_in()
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147 {
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148 printf("%s line %d: SW %02X %02X\n", sw1_timestamp, sw1_line, sw1,
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149 rx_byte);
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150 state = STATE_READY_FOR_CMD;
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151 }