FreeCalypso > hg > sms-coding-utils

annotate gen-pdu/message.c @ 12:0fe95ca922c7

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sms-gen-tpdu: check the high bit of GSM7 msg input
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 05 Aug 2023 16:55:24 +0000
parents 17dd30989c0b
children d9d722033ff1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
9
003660a57f99 new program sms-gen-tpdu
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
003660a57f99 new program sms-gen-tpdu
Mychaela Falconia <falcon@freecalypso.org>
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2 * This module implements TPDU encoding of actual messages, after all
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3 * settings have been captured.
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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 <ctype.h>
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8 #include <stdio.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 #include "error.h"
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13
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14 extern int dir_mo, include_sca;
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15 extern u_char sc_addr[12], user_addr[12];
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16 extern u_char mr_byte, pid_byte, dcs_byte;
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17 extern u_char scts_buf[7];
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18 extern int is_septet, scts_is_set;
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19
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20 extern int input_lineno;
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21
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22 static void
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23 emit_first_octet(udhi)
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24 {
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25 u_char fo;
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26
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27 if (dir_mo)
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28 fo = 1;
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29 else
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30 fo = 0;
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31 if (udhi)
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32 fo |= 0x40;
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33 printf("%02X", fo);
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34 }
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35
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36 static void
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37 make_pdu(udl, ud_buf, ud_octets, udhi)
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38 u_char *ud_buf;
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39 unsigned udl, ud_octets;
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40 {
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41 if (include_sca)
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42 emit_hex_out(sc_addr, sc_addr[0] + 1, stdout);
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43 emit_first_octet(udhi);
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44 if (dir_mo)
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45 printf("%02X", mr_byte);
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46 emit_hex_out(user_addr, ((user_addr[0] + 1) >> 1) + 2, stdout);
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47 printf("%02X", pid_byte);
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48 printf("%02X", dcs_byte);
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49 if (!dir_mo) {
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50 if (!scts_is_set)
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51 set_auto_scts();
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52 emit_hex_out(scts_buf, 7, stdout);
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53 }
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54 printf("%02X", udl);
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55 emit_hex_out(ud_buf, ud_octets, stdout);
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56 putchar('\n');
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57 }
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58
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59 static void
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60 cmd_msg_common(arg, udhi)
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61 char *arg;
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62 {
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63 u_char input[160], ud7[160], octbuf[140];
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64 unsigned input_len, udhl, udhl1, udh_chars, plain_chars;
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65 unsigned udl, udl_octets;
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66
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67 for (input_len = 0; ; input_len++) {
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68 while (isspace(*arg))
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69 arg++;
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70 if (!*arg)
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71 break;
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72 if (!isxdigit(arg[0]) || !isxdigit(arg[1])) {
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73 fprintf(stderr, ERR_PREFIX "invalid hex string\n",
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74 input_lineno);
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75 exit(1);
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76 }
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77 if (input_len >= 160) {
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78 toolong: fprintf(stderr, ERR_PREFIX "hex string is too long\n",
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79 input_lineno);
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80 exit(1);
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81 }
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82 input[input_len] = (decode_hex_digit(arg[0]) << 4) |
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83 decode_hex_digit(arg[1]);
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84 arg += 2;
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85 }
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86 if (!is_septet && input_len > 140)
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87 goto toolong;
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88 if (udhi) {
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89 if (!input_len) {
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90 fprintf(stderr, ERR_PREFIX
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91 "empty message is invalid with UDHI\n",
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92 input_lineno);
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93 exit(1);
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94 }
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95 udhl = input[0];
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96 udhl1 = udhl + 1;
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97 if (udhl1 > input_len) {
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98 fprintf(stderr, ERR_PREFIX "UDHL exceeds UD length\n",
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99 input_lineno);
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100 exit(1);
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101 }
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102 }
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103 if (!is_septet) {
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104 make_pdu(input_len, input, input_len, udhi);
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105 return;
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106 }
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107 if (udhi)
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108 udh_chars = (udhl1 * 8 + 6) / 7;
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109 else {
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110 udhl1 = 0;
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111 udh_chars = 0;
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112 }
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113 plain_chars = input_len - udhl1;
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114 if (check_high_bit(input + udhl1, plain_chars) < 0) {
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115 fprintf(stderr, ERR_PREFIX "high bit set in GSM7 data\n",
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116 input_lineno);
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117 exit(1);
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118 }
9
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119 udl = udh_chars + plain_chars;
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120 if (udl > 160) {
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121 fprintf(stderr, ERR_PREFIX
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122 "message exceeds 160 septets after UDH\n",
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123 input_lineno);
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124 exit(1);
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125 }
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126 udl_octets = (udl * 7 + 7) / 8;
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127 bzero(ud7, 160);
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128 bcopy(input + udhl1, ud7 + udh_chars, plain_chars);
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129 gsm7_pack(ud7, octbuf, udl_octets);
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130 if (udhi)
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131 bcopy(input, octbuf, udhl1);
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132 make_pdu(udl, octbuf, udl_octets, udhi);
9
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133 }
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134
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135 void
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136 cmd_msg_plain(argc, argv)
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137 char **argv;
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138 {
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139 cmd_msg_common(argv[1], 0);
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140 }
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141
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142 void
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143 cmd_msg_udh(argc, argv)
003660a57f99 new program sms-gen-tpdu
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144 char **argv;
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145 {
003660a57f99 new program sms-gen-tpdu
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146 cmd_msg_common(argv[1], 1);
003660a57f99 new program sms-gen-tpdu
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147 }