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annotate tfo/tfo-trace-msg.c @ 33:e828468b0afd

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doc/TFO-xform/Theory: article written
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 31 Aug 2024 20:45:25 +0000
parents f6bb790e186a
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
29
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This program reads a raw binary file that contains a recording of
fec87477e60b new program tfo-trace-msg
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3 * a T1/E1 timeslot on the MSC side of a TRAU, analyzes it looking for
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4 * TFO IS messages, and prints whatever it finds.
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5 */
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6
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7 #include <stdio.h>
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8 #include <stdint.h>
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9 #include <stdlib.h>
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10 #include <string.h>
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11 #include <strings.h>
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12
30
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13 #define MAX_EXT_WORDS 5
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14
29
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15 static uint8_t is_hunt_buf[320];
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16 static int is_state;
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17 static unsigned is_hunt_fill;
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18 static unsigned is_offset;
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19 static unsigned is_file_offset;
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20 static unsigned is_bit_count;
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21 static uint32_t is_rx_word, is_cmd, is_ext_words[MAX_EXT_WORDS];
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22 static unsigned is_ext_count;
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23
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24 static const u_char hdr_pattern[20] = {0, 1, 0, 1, 0, 1, 1, 0, 1, 0,
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25 0, 1, 1, 0, 1, 0, 1, 0, 0, 1};
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26
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27 static void
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28 is_rx_hunt(cur_file_offset)
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29 unsigned cur_file_offset;
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30 {
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31 unsigned offset, n;
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32
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33 for (offset = 0; offset < 16; offset++) {
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34 for (n = 0; n < 20; n++)
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35 if ((is_hunt_buf[offset + n*16] & 1) != hdr_pattern[n])
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36 break;
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37 if (n == 20)
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38 break;
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39 }
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40 if (n != 20)
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41 return;
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42 is_offset = offset;
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43 is_file_offset = cur_file_offset - 19*16 + offset;
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44 is_state = 1;
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45 is_bit_count = 0;
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46 is_rx_word = 0;
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47 is_hunt_fill = 0;
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48 }
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49
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50 static void
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51 is_process_cmd()
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52 {
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53 int cont;
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54
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55 printf("0x%x: ", is_file_offset);
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56 is_cmd = is_rx_word;
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57 switch (is_cmd) {
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58 case 0x05D:
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59 printf("IS_REQ\n");
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60 cont = 1;
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61 break;
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62 case 0x0BA:
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63 printf("IS_ACK\n");
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64 cont = 1;
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65 break;
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66 case 0x0E7:
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67 printf("IS_IPE\n");
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68 cont = 1;
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69 break;
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70 case 0x129:
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71 printf("IS_FILL\n");
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72 cont = 0;
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73 break;
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74 case 0x174:
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75 printf("IS_DUP\n");
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76 cont = 0;
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77 break;
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78 case 0x193:
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79 printf("IS_SYL\n");
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80 cont = 0;
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81 break;
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82 default:
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83 printf("unknown IS_Command 0x%03X\n", (unsigned) is_cmd);
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84 cont = 0;
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85 }
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86 if (cont) {
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87 is_state = 2;
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88 is_bit_count = 0;
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89 is_rx_word = 0;
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90 is_ext_count = 0;
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91 } else
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92 is_state = 0;
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93 }
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94
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95 static void
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96 process_tfo_req_ack(reqack)
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97 char *reqack;
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98 {
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99 if (is_ext_count < 2)
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100 return;
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101 if (is_ext_words[0] != 0x5394B) /* GSM System ID */
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102 return;
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103 printf(" TFO_%s: List_Ind=%u Sig=0x%02X CoID=0x%X CRC=%u\n", reqack,
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104 (is_ext_words[1] >> 18) & 1, (is_ext_words[1] >> 10) & 0xFF,
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105 (is_ext_words[1] >> 5) & 0xF, (is_ext_words[1] >> 2) & 7);
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106 }
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107
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108 static void
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109 is_process_high_level()
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110 {
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111 switch (is_cmd) {
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112 case 0x05D:
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113 process_tfo_req_ack("REQ");
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114 break;
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115 case 0x0BA:
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116 process_tfo_req_ack("ACK");
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117 break;
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118 }
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119 }
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120
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121 static void
29
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122 is_process_ext()
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123 {
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124 printf(" IS_Extension: 0x%05X", (unsigned) is_rx_word);
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125 if (is_rx_word & 0x80200) {
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126 printf(" (bad sync)\n");
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127 is_state = 0;
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128 return;
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129 }
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130 if (is_ext_count < MAX_EXT_WORDS)
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131 is_ext_words[is_ext_count++] = is_rx_word;
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132 switch (is_rx_word & 3) {
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133 case 0:
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134 printf(" (final)\n");
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135 is_state = 0;
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136 is_process_high_level();
29
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137 return;
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138 case 3:
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139 printf(" (continue)\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 is_state = 2;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 is_bit_count = 0;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 is_rx_word = 0;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 return;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 default:
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 printf(" (bad EX)\n");
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
146 is_state = 0;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
147 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
148 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
149
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
150 static void
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
151 is_rx_process(input, cur_file_offset)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
152 uint8_t *input;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
153 unsigned cur_file_offset;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
154 {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
155 unsigned new_bit;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
156
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
157 memmove(is_hunt_buf, is_hunt_buf + 16, 304);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
158 memcpy(is_hunt_buf + 304, input, 16);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
159 if (!is_state) {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
160 if (is_hunt_fill < 20)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
161 is_hunt_fill++;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
162 if (is_hunt_fill == 20)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
163 is_rx_hunt(cur_file_offset);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
164 return;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
165 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
166 new_bit = input[is_offset] & 1;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
167 is_rx_word <<= 1;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
168 is_rx_word |= new_bit;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
169 is_bit_count++;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
170 if (is_state == 1 && is_bit_count == 10)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
171 is_process_cmd();
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
172 else if (is_state == 2 && is_bit_count == 20)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
173 is_process_ext();
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
174 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
175
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
176 main(argc, argv)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
177 char **argv;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
178 {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
179 FILE *inf;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
180 uint8_t chunk[16];
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
181 unsigned file_offset;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
182 int cc;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
183
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
184 if (argc != 2) {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
185 fprintf(stderr, "usage: %s pcm-capture-file\n", argv[0]);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
186 exit(1);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
187 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
188 inf = fopen(argv[1], "r");
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
189 if (!inf) {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
190 perror(argv[1]);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
191 exit(1);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
192 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
193 for (file_offset = 0; ; file_offset += 16) {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
194 cc = fread(chunk, 1, 16, inf);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
195 if (cc == 0)
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
196 break;
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
197 if (cc != 16) {
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
198 fprintf(stderr,
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
199 "error: read of 16 bytes returned %d\n", cc);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
200 exit(1);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
201 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
202 is_rx_process(chunk, file_offset);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
203 }
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
204 exit(0);
fec87477e60b new program tfo-trace-msg
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
205 }