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annotate mpffs/dbgls.c @ 34:95f61c3b430a

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mpffs-rdutils: pathname search implemented
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Sun, 30 Jun 2013 16:20:28 +0000
parents 660b0ea739f3
children e9c6d6615f32
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33
660b0ea739f3 mpffs-dbgls implemented
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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 ch.entryno = ent;
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32 get_index_entry(&ch);
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33 if (ch.type != 0xF4) {
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34 fprintf(stderr,
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35 "file continuation object at index %x: type %02X != expected F4\n",
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36 ent, ch.type);
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37 return;
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38 }
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39 validate_chunk(&ch);
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40 printf(" #%x chunk addr=0x%x len=0x%x\n", ch.entryno,
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41 ch.offset, ch.len);
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42 size_extra_chunk(&ch, &chi);
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43 printf(" extra chunk: %lu bytes at 0x%lx\n", (u_long) chi.len,
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44 (u_long)(chi.start-image));
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45 if (ch.sibling != 0xFFFF)
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46 fprintf(stderr,
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47 "warning: file continuation object (index %x) has a non-nil sibling pointer\n",
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48 ent);
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49 }
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50 }
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51
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52 void
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53 dump_object(obj)
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54 struct objinfo *obj;
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55 {
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56 int typechar;
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57 struct chunkinfo chi;
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58
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59 switch (obj->type) {
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60 case 0xF2:
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61 /* directory */
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62 typechar = 'd';
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63 break;
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64 case 0xF1:
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65 /* regular file */
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66 typechar = '-';
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67 break;
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68 case 0xE1:
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69 /* special .journal file */
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70 typechar = 'j';
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71 break;
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72 default:
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73 /* unknown! */
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74 typechar = 'U';
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75 }
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76 printf("%c %s\n", typechar, workpath);
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77 printf(" #%x chunk addr=0x%x len=0x%x\n", obj->entryno,
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78 obj->offset, obj->len);
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79 switch (obj->type) {
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80 case 0xF2:
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81 /* directory */
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82 return;
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83 case 0xF1:
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84 /* regular file */
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85 size_head_chunk(obj, &chi);
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86 printf(" head chunk: %lu bytes at 0x%lx\n", (u_long) chi.len,
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87 (u_long)(chi.start-image));
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88 dump_extra_chunks(obj->descend);
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89 return;
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90 default:
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91 if (obj->descend != 0xFFFF)
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92 printf(" unexpected descend pointer: %x\n",
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93 obj->descend);
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94 }
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95 }
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96
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97 dump_dir(firstent, path_prefix)
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98 {
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99 int ent;
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100 struct objinfo obj;
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101
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102 for (ent = firstent; ent != 0xFFFF; ent = obj.sibling) {
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103 obj.entryno = ent;
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104 get_index_entry(&obj);
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105 if (!obj.type) /* skip deleted objects w/o further validation */
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106 continue;
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107 validate_chunk(&obj);
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108 validate_obj_name(&obj);
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109 if (path_prefix + strlen(obj.dataptr) + 2 > sizeof workpath) {
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110 fprintf(stderr,
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111 "handling object at index %x, name \"%s\": path buffer overflow\n",
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112 obj.entryno, (char *)obj.dataptr);
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113 exit(1);
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114 }
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115 sprintf(workpath + path_prefix, "/%s", (char *)obj.dataptr);
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116 dump_object(&obj);
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117 if (obj.type == 0xF2)
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118 dump_dir(obj.descend, strlen(workpath));
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119 }
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120 }
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121
34
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122 save_pathname_arg(pnarg)
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123 char *pnarg;
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124 {
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125 if (*pnarg == '/')
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126 pnarg++;
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127 if (strlen(pnarg) + 2 > sizeof workpath) {
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128 fprintf(stderr,
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129 "error: specified pathname is too long (overflows internal buffer)\n");
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130 exit(1);
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131 }
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132 sprintf(workpath, "/%s", pnarg);
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133 }
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134
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135 dump_by_pathname(pnarg)
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136 char *pnarg;
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137 {
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138 struct objinfo obj;
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139
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140 save_pathname_arg(pnarg);
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141 obj.entryno = find_pathname(pnarg);
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142 get_index_entry(&obj);
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143 validate_chunk(&obj);
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144 dump_object(&obj);
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145 }
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146
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147 usage()
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148 {
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149 fprintf(stderr, "usage: mpffs-dbgls [options] ffs-image [pathname]\n");
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150 exit(1);
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151 }
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152
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153 main(argc, argv)
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154 char **argv;
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155 {
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156 extern int optind;
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157
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158 parse_cmdline_options(argc, argv);
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159 argc -= optind;
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160 argv += optind;
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161 if (argc < 1 || argc > 2)
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162 usage();
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163 verbose++;
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164 imgfile = argv[0];
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165 preliminaries();
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166 if (argc == 1)
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167 dump_dir(root.descend, 0);
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168 else
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169 dump_by_pathname(argv[1]);
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170 exit(0);
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171 }