FreeCalypso > hg > fc-sim-tools

annotate serial/collect_atr.c @ 53:fbedb67d234f

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serial: fix parity for inverse coding convention Important note: it is my (Mother Mychaela's) understanding that SIM cards with inverse coding convention are extremely rare, and I have never seen such a card. Therefore, our support for the inverse coding convention will likely remain forever untested.
author Mychaela Falconia <falcon@freecalypso.org>
date Sun, 21 Mar 2021 20:46:09 +0000
parents 1d96f3b4f155
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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38
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1 /*
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2 * This module contains the code for collecting ATR bytes from the SIM,
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3 * as well as subsequent byte Rx.
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4 */
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5
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6 #include <sys/types.h>
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7 #include <sys/time.h>
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8 #include <sys/errno.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12
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13 extern int target_fd;
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14
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15 #define MAX_ATR_BYTES 33
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16
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17 extern unsigned char inverse_coding_table[256];
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18
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19 u_char atr_buf[MAX_ATR_BYTES];
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20 unsigned atr_length;
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21 int inverse_coding;
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22
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23 void
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24 invert_bytes(buf, nbytes)
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25 u_char *buf;
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26 unsigned nbytes;
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27 {
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28 unsigned n;
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29
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30 for (n = 0; n < nbytes; n++)
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31 buf[n] = inverse_coding_table[buf[n]];
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32 }
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33
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34 collect_bytes_from_sim(buf, expect_len)
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35 u_char *buf;
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36 unsigned expect_len;
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37 {
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38 fd_set fds;
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39 struct timeval tv;
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40 unsigned rcvd;
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41 int cc;
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42
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43 for (rcvd = 0; rcvd < expect_len; ) {
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44 FD_ZERO(&fds);
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45 FD_SET(target_fd, &fds);
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46 tv.tv_sec = 2;
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47 tv.tv_usec = 0;
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48 cc = select(target_fd+1, &fds, NULL, NULL, &tv);
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49 if (cc < 0) {
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50 if (errno == EINTR)
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51 continue;
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52 perror("select");
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53 return(-1);
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54 }
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55 if (cc < 1) {
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56 fprintf(stderr,
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57 "error: timeout waiting for byte(s) from SIM\n");
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58 return(-1);
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59 }
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60 cc = read(target_fd, buf + rcvd, expect_len - rcvd);
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61 if (cc <= 0) {
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62 perror("read after successful select");
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63 return(-1);
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64 }
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65 rcvd += cc;
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66 }
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67 if (inverse_coding)
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68 invert_bytes(buf, rcvd);
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69 return(0);
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70 }
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71
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72 check_atr_tck()
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73 {
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74 unsigned b, p;
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75
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76 b = 0;
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77 for (p = 1; p < atr_length; p++)
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78 b ^= atr_buf[p];
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79 if (b) {
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80 fprintf(stderr, "error: ATR checksum is bad\n");
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81 return(-1);
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82 }
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83 return(0);
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84 }
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85
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86 collect_atr()
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87 {
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88 int rc;
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89 unsigned count, y, nhist, have_tck;
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90
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91 rc = collect_bytes_from_sim(atr_buf, 2);
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92 if (rc < 0)
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93 return(rc);
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94 if (atr_buf[0] == 0x3B) {
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95 /* direct convention */
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96 } else if (atr_buf[0] == 0x03) {
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97 /* inverse convention */
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98 inverse_coding = 1;
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99 atr_buf[0] = 0x3F;
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100 atr_buf[1] = inverse_coding_table[atr_buf[1]];
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101 } else {
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102 fprintf(stderr,
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103 "error: received TS=0x%02X, matches neither convention\n",
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104 atr_buf[0]);
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105 return(-1);
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106 }
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107 atr_length = 2;
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108 nhist = atr_buf[1] & 0x0F;
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109 y = atr_buf[1] & 0xF0;
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110 have_tck = 0;
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111 while (y) {
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112 count = 0;
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113 if (y & 0x10)
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114 count++;
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115 if (y & 0x20)
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116 count++;
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117 if (y & 0x40)
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118 count++;
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119 if (y & 0x80)
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120 count++;
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121 if (atr_length + count > MAX_ATR_BYTES) {
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122 atr_too_long: fprintf(stderr, "error: ATR exceeds 33 byte limit\n");
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123 return(-1);
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124 }
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125 rc = collect_bytes_from_sim(atr_buf + atr_length, count);
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126 if (rc < 0)
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127 return(rc);
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128 atr_length += count;
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129 if (y & 0x80) {
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130 y = atr_buf[atr_length-1] & 0xF0;
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diff changeset
131 if (atr_buf[atr_length-1] & 0x0F)
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 have_tck = 1;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 } else
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 y = 0;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 }
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 count = nhist + have_tck;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 if (count) {
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 if (atr_length + count > MAX_ATR_BYTES)
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 goto atr_too_long;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 rc = collect_bytes_from_sim(atr_buf + atr_length, count);
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 if (rc < 0)
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 return(rc);
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 atr_length += count;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 }
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 if (have_tck)
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 return check_atr_tck();
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 else
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 return 0;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149 }
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 void
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 print_atr(head)
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 char *head;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 {
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 unsigned n;
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 fputs(head, stdout);
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 for (n = 0; n < atr_length; n++) {
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 printf(" %02X", atr_buf[n]);
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 }
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 putchar('\n');
1d96f3b4f155 serial: started with fcsim-serial-atr
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 }