FreeCalypso > hg > freecalypso-reveng
annotate mpffs/dbgls.c @ 42:15c2ac2c5c73
pirollback: started
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sat, 06 Jul 2013 20:16:34 +0000 |
parents | e9c6d6615f32 |
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rev | line source |
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1 /* |
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2 * Whereas mpffs-ls is more user-oriented, mpffs-dbgls is structured a little |
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3 * different in order to provide a more low-level view of the FFS structure. |
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4 */ |
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5 |
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6 #include <sys/types.h> |
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7 #include <ctype.h> |
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8 #include <stdio.h> |
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9 #include <string.h> |
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10 #include <strings.h> |
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11 #include <stdlib.h> |
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12 #include <unistd.h> |
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13 #include "types.h" |
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14 #include "struct.h" |
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15 |
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16 extern char *imgfile; |
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17 extern u8 *image; |
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18 extern struct objinfo root; |
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19 extern int verbose; |
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20 |
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21 char workpath[512]; |
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22 |
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23 void |
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24 dump_extra_chunks(first_extra_chunk) |
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25 { |
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26 int ent; |
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27 struct objinfo ch; |
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28 struct chunkinfo chi; |
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29 |
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30 for (ent = first_extra_chunk; ent != 0xFFFF; ent = ch.descend) { |
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31 loop: ch.entryno = ent; |
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32 get_index_entry(&ch); |
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33 switch (ch.type) { |
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34 case 0xF4: |
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35 validate_chunk(&ch); |
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36 printf(" #%x chunk addr=0x%x len=0x%x\n", ch.entryno, |
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37 ch.offset, ch.len); |
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38 size_extra_chunk(&ch, &chi); |
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39 printf(" extra chunk: %lu bytes at 0x%lx\n", |
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40 (u_long) chi.len, (u_long)(chi.start-image)); |
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41 break; |
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42 case 0x00: |
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43 printf(" #%x marked as deleted\n", ch.entryno); |
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44 if (ch.sibling == 0xFFFF) { |
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45 printf(" nil sibling pointer!\n"); |
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46 break; |
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47 } |
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48 ent = ch.sibling; |
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49 printf(" relocated to #%x\n", ent); |
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50 goto loop; |
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51 default: |
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52 printf( |
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53 " file continuation object at index %x: unexpected type %02X\n", |
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54 ent, ch.type); |
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55 } |
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56 if (ch.sibling != 0xFFFF) |
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57 printf( |
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58 " file continuation object (index %x) has a non-nil sibling pointer\n", |
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59 ent); |
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60 } |
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61 } |
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62 |
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63 void |
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64 dump_object(obj) |
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65 struct objinfo *obj; |
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66 { |
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67 int typechar; |
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68 struct chunkinfo chi; |
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69 |
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70 switch (obj->type) { |
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71 case 0xF2: |
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72 /* directory */ |
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73 typechar = 'd'; |
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74 break; |
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75 case 0xF1: |
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76 /* regular file */ |
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77 typechar = 'f'; |
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78 break; |
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79 case 0xE1: |
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80 /* special .journal file */ |
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81 typechar = 'j'; |
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82 break; |
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83 default: |
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84 /* unknown! */ |
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85 typechar = 'U'; |
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86 } |
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87 printf("%c %s\n", typechar, workpath); |
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88 printf(" #%x chunk addr=0x%x len=0x%x\n", obj->entryno, |
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89 obj->offset, obj->len); |
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90 switch (obj->type) { |
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91 case 0xF2: |
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92 /* directory */ |
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93 return; |
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94 case 0xF1: |
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95 /* regular file */ |
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96 size_head_chunk(obj, &chi); |
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97 printf(" head chunk: %lu bytes at 0x%lx\n", (u_long) chi.len, |
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98 (u_long)(chi.start-image)); |
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99 dump_extra_chunks(obj->descend); |
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100 return; |
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101 default: |
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102 if (obj->descend != 0xFFFF) |
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103 printf(" unexpected descend pointer: %x\n", |
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104 obj->descend); |
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105 } |
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106 } |
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107 |
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108 dump_dir(firstent, path_prefix) |
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109 { |
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110 int ent; |
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111 struct objinfo obj; |
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112 |
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113 for (ent = firstent; ent != 0xFFFF; ent = obj.sibling) { |
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114 obj.entryno = ent; |
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115 get_index_entry(&obj); |
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116 if (!obj.type) /* skip deleted objects w/o further validation */ |
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117 continue; |
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118 validate_chunk(&obj); |
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119 validate_obj_name(&obj); |
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120 if (path_prefix + strlen(obj.dataptr) + 2 > sizeof workpath) { |
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121 fprintf(stderr, |
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122 "handling object at index %x, name \"%s\": path buffer overflow\n", |
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123 obj.entryno, (char *)obj.dataptr); |
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124 exit(1); |
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125 } |
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126 sprintf(workpath + path_prefix, "/%s", (char *)obj.dataptr); |
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127 dump_object(&obj); |
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128 if (obj.type == 0xF2) |
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129 dump_dir(obj.descend, strlen(workpath)); |
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130 } |
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131 } |
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132 |
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133 save_pathname_arg(pnarg) |
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134 char *pnarg; |
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135 { |
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136 if (*pnarg == '/') |
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137 pnarg++; |
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138 if (strlen(pnarg) + 2 > sizeof workpath) { |
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139 fprintf(stderr, |
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140 "error: specified pathname is too long (overflows internal buffer)\n"); |
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141 exit(1); |
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142 } |
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143 sprintf(workpath, "/%s", pnarg); |
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144 } |
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145 |
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146 dump_by_pathname(pnarg) |
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147 char *pnarg; |
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148 { |
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149 struct objinfo obj; |
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150 |
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151 save_pathname_arg(pnarg); |
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152 obj.entryno = find_pathname(pnarg); |
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153 get_index_entry(&obj); |
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154 validate_chunk(&obj); |
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155 dump_object(&obj); |
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156 } |
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157 |
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158 usage() |
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159 { |
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160 fprintf(stderr, "usage: mpffs-dbgls [options] ffs-image [pathname]\n"); |
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161 exit(1); |
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162 } |
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163 |
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164 main(argc, argv) |
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165 char **argv; |
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166 { |
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167 extern int optind; |
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168 |
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169 parse_cmdline_options(argc, argv); |
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170 argc -= optind; |
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171 argv += optind; |
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172 if (argc < 1 || argc > 2) |
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173 usage(); |
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174 verbose++; |
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175 imgfile = argv[0]; |
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176 preliminaries(); |
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177 if (argc == 1) |
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178 dump_dir(root.descend, 0); |
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179 else |
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180 dump_by_pathname(argv[1]); |
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181 exit(0); |
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182 } |