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annotate simtool/alpha_valid.c @ 103:90eff13a72fd

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fc-simtool: implemented alpha field decoding and spn command
author Mychaela Falconia <falcon@freecalypso.org>
date Mon, 25 Jan 2021 04:54:47 +0000
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103
90eff13a72fd fc-simtool: implemented alpha field decoding and spn command
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1 /*
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2 * This module contains functions for validating alpha fields
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3 * that exist in various SIM files.
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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 <string.h>
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8 #include <strings.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11
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12 static
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13 validate_classic_gsm(data, nbytes, textlenp)
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14 u_char *data;
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15 unsigned nbytes, *textlenp;
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16 {
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17 u_char *dp;
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18 unsigned n;
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19
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20 dp = data;
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21 for (n = 0; n < nbytes; n++) {
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22 if (*dp == 0xFF)
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23 break;
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24 if (*dp & 0x80)
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25 return(-1);
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26 dp++;
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27 }
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28 if (textlenp)
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29 *textlenp = n;
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30 for (; n < nbytes; n++)
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31 if (*dp++ != 0xFF)
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32 return(-1);
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33 return(0);
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34 }
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35
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36 static
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37 validate_ucs2_80(data, nbytes, textlenp)
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38 u_char *data;
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39 unsigned nbytes, *textlenp;
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40 {
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41 u_char *dp, *endp;
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42
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43 if (nbytes < 3)
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44 return(-1);
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45 dp = data + 1;
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46 endp = data + nbytes;
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47 while (dp < endp) {
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48 if (dp + 1 == endp) {
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49 if (*dp != 0xFF)
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50 return(-1);
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51 if (textlenp)
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52 *textlenp = dp - data;
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53 return(0);
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54 }
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55 if (dp[0] == 0xFF && dp[1] == 0xFF)
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56 break;
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57 dp += 2;
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58 }
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59 if (textlenp)
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60 *textlenp = dp - data;
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61 while (dp < endp)
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62 if (*dp++ != 0xFF)
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63 return(-1);
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64 return(0);
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65 }
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66
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67 static
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68 validate_ucs2_81(data, nbytes, textlenp)
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69 u_char *data;
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70 unsigned nbytes, *textlenp;
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71 {
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72 u_char *dp, *endp;
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73 unsigned textlen;
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74
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75 if (nbytes < 4)
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76 return(-1);
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77 if (!data[1])
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78 return(-1);
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79 textlen = data[1] + 3;
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80 if (textlen > nbytes)
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81 return(-1);
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82 if (textlenp)
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83 *textlenp = textlen;
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84 dp = data + textlen;
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85 endp = data + nbytes;
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86 while (dp < endp)
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87 if (*dp++ != 0xFF)
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88 return(-1);
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89 return(0);
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90 }
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91
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92 static
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93 validate_ucs2_82(data, nbytes, textlenp)
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94 u_char *data;
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95 unsigned nbytes, *textlenp;
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96 {
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97 u_char *dp, *endp;
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98 unsigned textlen;
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99
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100 if (nbytes < 5)
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101 return(-1);
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102 if (!data[1])
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103 return(-1);
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104 textlen = data[1] + 4;
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105 if (textlen > nbytes)
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106 return(-1);
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107 if (textlenp)
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108 *textlenp = textlen;
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109 dp = data + textlen;
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110 endp = data + nbytes;
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111 while (dp < endp)
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112 if (*dp++ != 0xFF)
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113 return(-1);
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114 return(0);
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115 }
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116
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117 static
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118 validate_empty(data, nbytes, textlenp)
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119 u_char *data;
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120 unsigned nbytes, *textlenp;
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121 {
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122 u_char *dp;
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123 unsigned n;
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124
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125 dp = data;
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126 for (n = 0; n < nbytes; n++)
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127 if (*dp++ != 0xFF)
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128 return(-1);
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129 if (textlenp)
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130 *textlenp = 0;
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131 return(0);
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132 }
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133
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134 validate_alpha_field(data, nbytes, textlenp)
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135 u_char *data;
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136 unsigned nbytes, *textlenp;
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137 {
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138 if (data[0] < 0x80)
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139 return validate_classic_gsm(data, nbytes, textlenp);
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140 switch (data[0]) {
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141 case 0x80:
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142 return validate_ucs2_80(data, nbytes, textlenp);
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143 case 0x81:
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144 return validate_ucs2_81(data, nbytes, textlenp);
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145 case 0x82:
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146 return validate_ucs2_82(data, nbytes, textlenp);
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147 case 0xFF:
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148 return validate_empty(data, nbytes, textlenp);
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149 default:
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150 return -1;
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151 }
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152 }