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annotate atsc.c @ 86:537cf2245d98

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beginning of ARM7 disassembler
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 28 Mar 2014 07:01:27 +0000
parents 39f2ccd06b57
children
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65
3890c2672fe0 atsc hack written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
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2 * It is known that some GSM devices have undocumented AT commands for
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3 * changing the IMEI. There is no standard syntax for such an AT command
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4 * (by the "proper rules" one is not supposed to exist at all), and instead
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5 * there seem to be several different ad hoc syntaxes. This source file,
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6 * found on a Chinese site, implements one of these numerous ad hoc
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7 * IMEI-changing AT commands:
3890c2672fe0 atsc hack written
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8 *
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9 * ftp://ftp.ifctf.org/pub/GSM/TI_src/ati_sc.c
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10 *
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11 * Notice that this particular incarnation of the "set IMEI" AT command
3890c2672fe0 atsc hack written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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12 * is called AT@SC; there just happens to be an identically-named AT@SC
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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13 * command on Openmoko's GSM modems. Might it perchance be the same
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14 * IMEI changing command?
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15 *
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16 * This program constructs what should be a valid input to the decoding
3890c2672fe0 atsc hack written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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17 * logic in the ati_sc.c source above, for the purpose of testing whether
3890c2672fe0 atsc hack written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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18 * or not such a command would indeed effect an IMEI change on a GTA02 modem.
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19 */
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20
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21 #include <stdio.h>
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22 #include <ctype.h>
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23 #include <string.h>
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24 #include <strings.h>
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25 #include <stdlib.h>
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26
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27 static char hexdigits[] = "0123456789abcdef";
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28
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29 main(argc, argv)
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30 char **argv;
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31 {
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32 char hexout[16];
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33 unsigned n1, n2, cksum;
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34 int i, c;
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35
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36 if (argc != 2) {
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37 usage: fprintf(stderr, "usage: %s 15-IMEI-digits\n", argv[0]);
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38 exit(1);
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39 }
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40 if (strlen(argv[1]) != 15)
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41 goto usage;
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42 n1 = n2 = 0;
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43 for (i = 0; i < 15; i++) {
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44 c = argv[1][i];
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45 if (!isdigit(c))
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46 goto usage;
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47 c -= '0';
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48 hexout[i] = hexdigits[c ^ 5];
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49 if (i < 7)
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50 n1 = n1 * 10 + c;
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51 else
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52 n2 = n2 * 10 + c;
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53 }
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54 hexout[15] = '\0';
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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55 cksum = (n1 + n2) % 1973;
66
39f2ccd06b57 atsc hack: apparently this AT@SC command needs double quotes
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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56 printf("AT@SC=\"%s%04u\"\n", hexout, cksum);
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57 exit(0);
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58 }