FreeCalypso > hg > freecalypso-reveng
annotate atsc.c @ 102:44db5922ab8f
c139 boot re: entry code analyzed
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Mon, 31 Mar 2014 01:52:56 +0000 |
parents | 39f2ccd06b57 |
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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: |
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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 |
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12 * is called AT@SC; there just happens to be an identically-named AT@SC |
3890c2672fe0
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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
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17 * logic in the ati_sc.c source above, for the purpose of testing whether |
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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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55 cksum = (n1 + n2) % 1973; |
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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 } |