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annotate pirollback/journal.c @ 207:d12a3207b1aa

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D-Sample 20020917 firmware analysis
author Mychaela Falconia <falcon@ivan.Harhan.ORG>
date Fri, 01 Jan 2016 23:24:05 +0000
parents 78ac405716db
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
46
78ac405716db pirollback: journal parsing implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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diff changeset
1 #include <sys/types.h>
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2 #include <endian.h>
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3 #include <stdio.h>
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4 #include <string.h>
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5 #include <strings.h>
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6 #include <stdlib.h>
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7 #include <unistd.h>
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8 #include "types.h"
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9 #include "struct.h"
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10
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11 extern u8 image[0x480000];
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12 extern struct inode_info inode[];
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13 extern int last_inode;
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14 extern u8 blank_flash_line[16];
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15
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16 int journal_start_ino;
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17
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18 find_journal()
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19 {
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20 int ino;
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21 struct inode_info *inf;
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22
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23 for (ino = 2; ino <= last_inode; ino++) {
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24 inf = inode + ino;
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25 if (inf->type == 0xE1 && inf->parent == 1 &&
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26 !strcmp(inf->dataptr, ".journal"))
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27 return(ino);
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28 }
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29 fprintf(stderr, "error: cannot find /.journal\n");
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30 exit(1);
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31 }
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32
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33 parse_journal()
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34 {
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35 struct inode_info *inf;
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36 struct journal_entry *jr, *endp;
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37 int ino = 0;
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38 u16 tempu16;
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39 s16 temps16;
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40
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41 inf = inode + find_journal();
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42 if (inf->len != 0x4010) {
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43 fprintf(stderr,
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44 "error: /.journal file length differs from expected\n");
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45 exit(1);
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46 }
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47 jr = (struct journal_entry *)(inf->dataptr + 0xC);
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48 for (endp = jr + 0x3FF; jr < endp; jr++) {
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49 if (!bcmp(jr, blank_flash_line, 16))
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50 break;
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51 if (jr->status != 0xF1) {
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52 fprintf(stderr,
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53 "journal record at %x: status byte != F1\n",
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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54 (u8 *) jr - image);
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55 exit(1);
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56 }
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57 tempu16 = le16toh(jr->this_ino);
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58 if (ino) {
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59 ino++;
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60 if (ino != tempu16) {
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61 fprintf(stderr,
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62 "journal record at %x: break in inode # sequence\n",
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63 (u8 *) jr - image);
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64 exit(1);
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65 }
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66 } else {
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67 ino = tempu16;
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68 journal_start_ino = ino;
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69 }
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70 if (ino < 3 || ino > last_inode) {
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71 fprintf(stderr,
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72 "journal record at %x: inode # out of range\n",
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73 (u8 *) jr - image);
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74 exit(1);
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75 }
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76 inf = inode + ino;
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77 inf->jflash = jr;
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78 if (inf->type) {
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79 if (jr->objtype != inf->type) {
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80 fprintf(stderr,
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81 "journal record at %x: type mismatch\n",
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82 (u8 *) jr - image);
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83 exit(1);
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84 }
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85 } else {
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86 switch (jr->objtype) {
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87 case 0xE1:
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88 case 0xF1:
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89 case 0xF2:
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90 case 0xF4:
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91 break;
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92 default:
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93 fprintf(stderr,
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94 "journal record at %x: unexpected type byte value\n",
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95 (u8 *) jr - image);
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96 exit(1);
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97 }
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98 inf->type = jr->objtype;
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99 }
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100 if (le32toh(jr->location) != inf->rawloc) {
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101 fprintf(stderr,
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102 "journal record at %x: location field mismatch\n",
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103 (u8 *) jr - image);
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104 exit(1);
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105 }
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106 if (le16toh(jr->size) != inf->len) {
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107 fprintf(stderr,
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108 "journal record at %x: size field mismatch\n",
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109 (u8 *) jr - image);
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110 exit(1);
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111 }
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112 temps16 = le16toh(jr->link_ptr);
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113 if (temps16 < -last_inode || temps16 > last_inode) {
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114 fprintf(stderr,
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115 "journal record at %x: linkptr field out of range\n",
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116 (u8 *) jr - image);
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117 exit(1);
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118 }
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119 inf->j_unlink_ptr = temps16;
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120 temps16 = le16toh(jr->replacee);
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121 if (temps16 < 0 || temps16 > last_inode) {
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122 fprintf(stderr,
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123 "journal record at %x: replacee field out of range\n",
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124 (u8 *) jr - image);
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125 exit(1);
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126 }
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127 inf->j_oldver = temps16;
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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128 if (jr->repli) {
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129 fprintf(stderr,
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130 "journal record at %x: last 16-bit word is not zero as expected\n",
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131 (u8 *) jr - image);
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132 exit(1);
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133 }
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134 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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135 if (!ino) {
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136 fprintf(stderr, "error: journal is empty!\n");
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137 exit(1);
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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138 }
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Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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139 if (ino != last_inode) {
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140 fprintf(stderr, "error: journal end != inode block end\n");
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141 exit(1);
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142 }
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143 }