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annotate ffstools/tiffs-rd/basics.c @ 231:5ceacdbd4490

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tiffs IVA: finds the root inode
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 26 Jan 2014 08:11:42 +0000
parents ffaa033e7643
children 73372cfdaf7f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /*
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2 * This C module implements the "basics" of TIFFS image analysis.
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3 */
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4
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5 #include <sys/types.h>
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6 #include <sys/file.h>
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7 #include <sys/stat.h>
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8 #include <sys/mman.h>
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <unistd.h>
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12 #include <string.h>
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13 #include <strings.h>
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14 #include "types.h"
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15 #include "globals.h"
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16
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17 u8 tiffs_header[6] = {'F', 'f', 's', '#', 0x10, 0x02};
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18
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19 read_ffs_image()
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20 {
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21 int fd;
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22 struct stat st;
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23
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24 fd = open(imgfile, O_RDONLY);
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25 if (fd < 0) {
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26 perror(imgfile);
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27 exit(1);
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28 }
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29 fstat(fd, &st);
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30 if (!S_ISREG(st.st_mode)) {
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31 fprintf(stderr, "error: %s is not a regular file\n", imgfile);
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32 exit(1);
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33 }
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34 if (st.st_size < total_ffs_size) {
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35 fprintf(stderr,
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36 "error: %s is shorter than FFS size of 0x%lx bytes\n",
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37 imgfile, (u_long)total_ffs_size);
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38 exit(1);
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39 }
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40 image = mmap(NULL, total_ffs_size, PROT_READ, MAP_PRIVATE, fd, 0);
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41 if (image == MAP_FAILED) {
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42 perror("mmap");
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43 exit(1);
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44 }
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45 }
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46
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47 cmd_blkhdr()
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48 {
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49 int blk;
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50 u8 *blkhdr;
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51
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52 read_ffs_image();
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53 for (blk = 0; blk < total_blocks; blk++) {
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54 printf("Block %3d: ", blk);
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55 blkhdr = image + blk * eraseblk_size;
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56 if (bcmp(blkhdr, tiffs_header, sizeof tiffs_header)) {
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57 printf("No TIFFS header\n");
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58 continue;
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59 }
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60 printf("age %02X%02X, type/status %02X\n",
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61 blkhdr[7], blkhdr[6], blkhdr[8]);
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62 }
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63 exit(0);
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64 }
230
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65
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66 find_inode_block()
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67 {
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68 int i, abcnt;
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69 u8 *ptr;
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70
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71 if (index_blk_num >= 0) {
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72 if (index_blk_num >= total_blocks) {
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73 fprintf(stderr,
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74 "invalid block # given with the -a option\n");
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75 exit(1);
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76 }
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77 ptr = image + index_blk_num * eraseblk_size;
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78 if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) {
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79 fprintf(stderr,
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80 "error: block specified with -a has no TIFFS header\n");
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81 exit(1);
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82 }
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83 if (ptr[8] != 0xAB) {
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84 fprintf(stderr,
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85 "error: block specified with -a is not an AB block\n");
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86 exit(1);
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87 }
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88 inode_block = ptr;
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89 return(0);
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90 }
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91 abcnt = 0;
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92 for (ptr = image, i = 0; i < total_blocks; i++, ptr += eraseblk_size) {
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93 if (bcmp(ptr, tiffs_header, sizeof tiffs_header)) {
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94 fprintf(stderr,
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95 "warning: no TIFFS signature in erase block #%d (offset %x)\n",
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96 i, ptr - image);
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97 continue;
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98 }
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99 switch (ptr[8]) {
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100 case 0xAB:
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101 if (verbose)
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102 fprintf(stderr,
230
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103 "Found AB index in erase block #%d (offset %x)\n",
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104 i, ptr - image);
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105 index_blk_num = i;
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106 inode_block = ptr;
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107 abcnt++;
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108 continue;
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109 case 0xBD:
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110 case 0xBF:
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111 continue;
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112 }
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113 fprintf(stderr,
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114 "warning: unexpected block type/status %02X at offset %x\n",
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115 ptr[8], ptr - image);
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116 }
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117 if (!inode_block) {
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118 fprintf(stderr,
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119 "error: could not find an active inode block in %s\n",
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120 imgfile);
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121 exit(1);
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122 }
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123 if (abcnt > 1) {
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124 fprintf(stderr,
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125 "error: found more than one AB block; use -a\n");
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126 exit(1);
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127 }
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128 return(0);
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129 }
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130
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131 cmd_fsinfo()
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132 {
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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133 read_ffs_image();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 229
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134 find_inode_block();
ffaa033e7643 tiffs IVA: find_inode_block() integrated
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 229
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135 printf("Active inode block (AB) is block #%d\n", index_blk_num);
231
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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136 alloc_inode_table();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 230
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137 find_root_inode();
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 230
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138 printf("Root inode is #%x\n", root_inode);
230
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parents: 229
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139 exit(0);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
parents: 229
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140 }