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annotate pirollback/catino.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 18fa570685de
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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49
18fa570685de pirollback: catino implemented, works
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <strings.h>
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5 #include "types.h"
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6 #include "struct.h"
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7
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8 extern char *imgfile;
18fa570685de pirollback: catino implemented, works
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9 extern struct inode_info inode[];
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10 extern int last_inode;
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11 extern int journal_start_ino;
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12
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13 u8 *
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14 find_end_of_chunk(ino)
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15 {
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16 struct inode_info *ch = inode + ino;
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17 u8 *p;
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18 int i;
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19
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20 p = ch->dataptr + ch->len;
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21 for (i = 1; i <= 16; i++) {
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22 if (!p[-i])
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23 return(p - i);
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24 if (p[-1] != 0xFF)
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25 break;
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26 }
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27 fprintf(stderr,
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28 "chunk starting at %x (inode #%x): no valid termination found\n",
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29 ch->offset, ino);
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30 exit(1);
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31 }
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32
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33 dump_cont_chain(start)
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34 {
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35 int ino;
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36 struct inode_info *inf;
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37 u8 *endp;
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38
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39 for (ino = start; ino; ino = inf->descend) {
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40 inf = inode + ino;
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41 if (inf->type != 0xF4) {
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42 fprintf(stderr,
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43 "continuation chunk #%x does not have type F4\n",
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44 ino);
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45 exit(1);
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46 }
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47 endp = find_end_of_chunk(ino);
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48 write(1, inf->dataptr, endp - inf->dataptr);
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49 }
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50 }
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51
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52 do_cat(ino)
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53 {
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54 struct inode_info *inf = inode + ino;
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55 u8 *endp;
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56
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57 if (inf->type != 0xF1) {
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58 fprintf(stderr, "error: requested inode is not a file\n");
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59 exit(1);
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60 }
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61 endp = find_end_of_chunk(ino);
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62 if (endp > inf->byte_after_name)
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63 write(1, inf->byte_after_name, endp - inf->byte_after_name);
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64 dump_cont_chain(inf->descend);
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65 }
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66
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67 main(argc, argv)
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68 char **argv;
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69 {
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70 int ino;
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71 char *strtoul_endp;
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72
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73 if (argc != 3) {
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74 usage: fprintf(stderr, "usage: %s ffs-image inode\n", argv[0]);
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75 exit(1);
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76 }
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77 imgfile = argv[1];
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78 ino = strtoul(argv[2], &strtoul_endp, 16);
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79 if (!argv[2][0] || *strtoul_endp)
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80 goto usage;
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81 read_img_file();
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82 read_inodes();
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83 walk_tree();
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84 check_object_names();
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85 parse_journal();
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86 check_object_names(); /* rerun for "undeleted" objects */
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87 if (ino < 1 || ino > last_inode) {
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88 fprintf(stderr, "%s: bad inode number specified\n", argv[0]);
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89 exit(1);
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90 }
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91 do_cat(ino);
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92 exit(0);
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93 }