FreeCalypso > hg > freecalypso-tools

annotate miscutil/make-imeisv.c @ 1011:6d9b10633f10 default tip

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etmsync Pirelli IMEI retrieval: fix poor use of printf() Bug reported by Vadim Yanitskiy <fixeria@osmocom.org>: the construct where a static-allocated string was passed to printf() without any format arguments causes newer compilers to report a security problem. Given that formatted output is not needed here, just fixed string output, change printf() to fputs(), and direct the error message to stderr while at it.
author Mychaela Falconia <falcon@freecalypso.org>
date Thu, 23 May 2024 17:29:57 +0000
parents 2dcfad8a3ed0
children
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2dcfad8a3ed0 make-imeisv utility written
Mychaela Falconia <falcon@freecalypso.org>
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1 /*
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2 * This utility constructs a 16-digit IMEISV from a 15-digit IMEI
2dcfad8a3ed0 make-imeisv utility written
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3 * (which must have a valid Luhn check digit) and a 2-digit SV field.
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4 * It is intended for use in shell scripts.
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5 */
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6
2dcfad8a3ed0 make-imeisv utility written
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7 #include <stdio.h>
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8 #include <ctype.h>
2dcfad8a3ed0 make-imeisv utility written
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9 #include <stdlib.h>
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10
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11 parse_imei_arg(input, buf)
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12 char *input, *buf;
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13 {
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14 char *cp;
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15 int i;
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16
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17 cp = input;
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18 if (!isdigit(*cp)) {
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19 inv: fprintf(stderr,
2dcfad8a3ed0 make-imeisv utility written
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20 "error: IMEI argument must have 15 decimal digits\n");
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21 exit(1);
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22 }
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23 for (i = 0; i < 15; i++) {
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24 if (ispunct(*cp))
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25 cp++;
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26 if (!isdigit(*cp))
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27 goto inv;
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28 buf[i] = *cp++;
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29 }
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30 if (*cp)
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31 goto inv;
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32 }
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33
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34 check_luhn(digits)
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35 char *digits;
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36 {
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37 int i, dig, sum;
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38
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39 sum = 0;
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40 for (i = 0; i < 14; i++) {
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41 dig = digits[i] - '0';
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42 if (i & 1) {
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43 dig *= 2;
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44 if (dig > 9)
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45 dig -= 9;
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46 }
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47 sum += dig;
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48 }
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49 dig = sum % 10;
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50 if (dig)
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51 dig = 10 - dig;
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52 if (digits[14] != dig + '0') {
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53 fprintf(stderr, "error: given IMEI fails Luhn check\n");
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54 exit(1);
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55 }
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56 }
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57
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58 main(argc, argv)
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59 char **argv;
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60 {
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61 char imeibuf[15];
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62
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63 if (argc != 3) {
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64 fprintf(stderr, "usage: %s IMEI SV\n", argv[0]);
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65 exit(1);
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66 }
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67 parse_imei_arg(argv[1], imeibuf);
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68 check_luhn(imeibuf);
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69 if (!isdigit(argv[2][0]) || !isdigit(argv[2][1]) || argv[2][2]) {
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70 fprintf(stderr,
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71 "error: SV argument must have 2 decimal digits\n");
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72 exit(1);
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73 }
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74 printf("%.8s-%.6s-%s\n", imeibuf, imeibuf + 8, argv[2]);
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75 exit(0);
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76 }