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annotate miscprog/rfcap-grep.c @ 167:c25367bb7656

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objgrep: written, compiles
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Jul 2014 00:54:33 +0000
parents 597143ba1c37
children
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64
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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1 /*
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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2 * This utility performs a memmem() binary "grep", checking to see if a given
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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3 * binary file (mokoN firmware image) contains a particular binary "string"
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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4 * of 16 bytes: namely, the 16 bytes found in the "standard" /gsm/com/rfcap
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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5 * file on GTA0x modems.
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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6 */
b8753e705e1a rfcap-grep.c hack-utility written
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7
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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8 #define _GNU_SOURCE
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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9 #include <sys/types.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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10 #include <sys/file.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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11 #include <sys/stat.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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12 #include <stdio.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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13 #include <string.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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14 #include <stdlib.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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15 #include <unistd.h>
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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16
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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17 u_char needle[16] = {0x00, 0x1F, 0x41, 0x14, 0x00, 0x00, 0x00, 0x00,
b8753e705e1a rfcap-grep.c hack-utility written
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18 0x50, 0x00, 0x00, 0xA5, 0x05, 0x00, 0xC0, 0x00};
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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19 u_char *haystack;
b8753e705e1a rfcap-grep.c hack-utility written
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20 size_t haystack_size;
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21
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22 read_file(filename)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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23 char *filename;
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24 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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25 int fd;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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26 struct stat st;
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27
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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28 fd = open(filename, O_RDONLY);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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29 if (fd < 0) {
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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30 perror(filename);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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31 exit(1);
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32 }
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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33 fstat(fd, &st);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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34 if (!S_ISREG(st.st_mode)) {
b8753e705e1a rfcap-grep.c hack-utility written
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35 fprintf(stderr, "error: %s is not a regular file\n", filename);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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36 exit(1);
b8753e705e1a rfcap-grep.c hack-utility written
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37 }
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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38 haystack_size = st.st_size;
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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39 haystack = malloc(haystack_size);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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40 if (!haystack) {
b8753e705e1a rfcap-grep.c hack-utility written
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41 fprintf(stderr, "unable to malloc buffer for %s\n", filename);
b8753e705e1a rfcap-grep.c hack-utility written
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42 exit(1);
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43 }
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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44 read(fd, haystack, haystack_size);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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45 close(fd);
b8753e705e1a rfcap-grep.c hack-utility written
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46 }
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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47
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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48 main(argc, argv)
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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49 char **argv;
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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50 {
b8753e705e1a rfcap-grep.c hack-utility written
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51 u_char *result;
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52
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53 if (argc != 2) {
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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54 fprintf(stderr, "usage: %s mokoN.bin\n", argv[0]);
b8753e705e1a rfcap-grep.c hack-utility written
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55 exit(1);
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56 }
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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57 read_file(argv[1]);
b8753e705e1a rfcap-grep.c hack-utility written
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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58 result = memmem(haystack, haystack_size, needle, sizeof needle);
b8753e705e1a rfcap-grep.c hack-utility written
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59 if (result)
b8753e705e1a rfcap-grep.c hack-utility written
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60 printf("Found the rfcap bytes at offset 0x%x\n",
b8753e705e1a rfcap-grep.c hack-utility written
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61 result - haystack);
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62 else
b8753e705e1a rfcap-grep.c hack-utility written
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63 printf("rfcap bytes not found in this image\n");
b8753e705e1a rfcap-grep.c hack-utility written
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64 exit(0);
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65 }