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annotate mpffs/dbgls.c @ 167:c25367bb7656

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objgrep: written, compiles
author Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
date Fri, 04 Jul 2014 00:54:33 +0000
parents e9c6d6615f32
children
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rev   line source
33
660b0ea739f3 mpffs-dbgls implemented
Michael Spacefalcon <msokolov@ivan.Harhan.ORG>
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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) {
38
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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",
33
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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
34
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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
33
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158 usage()
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159 {
34
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160 fprintf(stderr, "usage: mpffs-dbgls [options] ffs-image [pathname]\n");
33
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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);
34
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170 argc -= optind;
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171 argv += optind;
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172 if (argc < 1 || argc > 2)
33
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173 usage();
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174 verbose++;
34
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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]);
33
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181 exit(0);
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182 }