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annotate mysteryffs/scan1.c @ 106:a39a38bbec4d

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analysis of what osmocon's voodoo payloads disassemble to in ARM/Thumb
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Mon, 31 Mar 2014 06:33:14 +0000
parents d41c555d7f1d
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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21
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
1 /*
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
2 * This program is the first MysteryFFS analysis tool written.
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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3 * Here I'm trying to understand the meaning of various fields
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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4 * in the index block records.
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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5 */
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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6
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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7 #include <sys/types.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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8 #include <sys/file.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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9 #include <sys/stat.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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10 #include <endian.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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11 #include <ctype.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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12 #include <stdio.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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13 #include <string.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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14 #include <strings.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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15 #include <stdlib.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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16 #include <unistd.h>
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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17
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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18 typedef unsigned char u8;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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19 typedef unsigned short u16;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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20 typedef unsigned int u32;
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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21
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
22 u8 blank_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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23 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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24
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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25 u8 mysteryffs_hdr[6] = {'F', 'f', 's', '#', 0x10, 0x02};
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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26
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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27 struct index_entry {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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28 u16 len;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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29 u8 unknown1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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30 u8 type;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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31 u16 nptr1;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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32 u16 nptr2;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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33 u32 dataptr;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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34 u16 unknown2;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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35 u16 version;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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36 };
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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37
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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38 char *imgfile;
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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39 u32 eraseblk_size;
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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40 int total_blocks;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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41 u32 total_img_size;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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42 u8 *image, *indexblk;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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43
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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44 read_img_file()
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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45 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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46 int fd;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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47 struct stat st;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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48
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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49 fd = open(imgfile, O_RDONLY);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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50 if (fd < 0) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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51 perror(imgfile);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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52 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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53 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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54 fstat(fd, &st);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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55 if (!S_ISREG(st.st_mode)) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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56 fprintf(stderr, "%s is not a regular file\n", imgfile);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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57 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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58 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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59 if (st.st_size < total_img_size) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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60 fprintf(stderr, "%s has fewer than 0x%x bytes\n", imgfile,
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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61 total_img_size);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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62 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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63 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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64 image = malloc(total_img_size);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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65 if (!image) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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66 perror("malloc");
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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67 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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68 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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69 read(fd, image, total_img_size);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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70 close(fd);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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71 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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72
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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73 find_index_block()
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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74 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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75 int i;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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76 u8 *ptr;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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77
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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78 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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79 if (bcmp(ptr, mysteryffs_hdr, 6))
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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80 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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81 if (ptr[8] != 0xAB)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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82 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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83 indexblk = ptr;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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84 return(0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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85 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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86 fprintf(stderr, "could not find a MysteryFFS index block in %s\n",
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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87 imgfile);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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88 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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89 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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90
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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91 is_namestr_ok(s)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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92 char *s;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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93 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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94 int cnt;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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95
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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96 for (cnt = 0; *s; s++, cnt++) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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97 if (cnt >= 32)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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98 return(0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
99 if (!isprint(*s))
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
100 return(0);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
101 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
102 if (cnt)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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103 return(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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104 else
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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105 return(0);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
106 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
107
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
108 char *
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
109 dataptr_to_name(dptr)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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110 u32 dptr;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
111 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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112 u8 *data;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
113
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
114 if (dptr > 0x0FFFFFFF) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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115 inv: return("<invptr>");
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
116 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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117 dptr <<= 4;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
118 if (dptr >= total_img_size)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
119 goto inv;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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120 data = image + dptr;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
121 if (is_namestr_ok(data))
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
122 return(data);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
123 else
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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124 return("<notname>");
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
125 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
126
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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127 dump_entry(rawptr, entrynum)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
128 u8 *rawptr;
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
129 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
130 struct index_entry ent;
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
131
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
132 bcopy(rawptr, &ent, 0x10);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
133 ent.len = le16toh(ent.len);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
134 ent.nptr1 = le16toh(ent.nptr1);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
135 ent.nptr2 = le16toh(ent.nptr2);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
136 ent.dataptr = le32toh(ent.dataptr);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
137 ent.unknown2 = le16toh(ent.unknown2);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
138 ent.version = le16toh(ent.version);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
139 printf("%x %s: len=%x %02X %02X nptr1=%x nptr2=%x %04X %04X\n",
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
140 entrynum, dataptr_to_name(ent.dataptr),
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
141 ent.len, ent.unknown1, ent.type,
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
142 ent.nptr1, ent.nptr2,
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
143 ent.unknown2, ent.version);
d41c555d7f1d beginning to explore MysteryFFS
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
diff changeset
144 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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145
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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146 dump_index()
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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147 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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148 u32 offset;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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149 u8 *entry;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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150
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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151 for (offset = 0x10; offset < eraseblk_size; offset += 0x10) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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152 entry = indexblk + offset;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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153 if (!bcmp(entry, blank_line, 16))
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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154 continue;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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155 dump_entry(entry, offset >> 4);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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156 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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157 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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158
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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159 main(argc, argv)
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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160 char **argv;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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161 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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162 if (argc != 4) {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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163 fprintf(stderr, "usage: %s imgfile blksize nblocks\n", argv[0]);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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164 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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165 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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166 imgfile = argv[1];
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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167 eraseblk_size = strtoul(argv[2], 0, 0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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168 total_blocks = strtoul(argv[3], 0, 0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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169 total_img_size = eraseblk_size * total_blocks;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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170 read_img_file();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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171 find_index_block();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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172 dump_index();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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173 exit(0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents:
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174 }