FreeCalypso > hg > freecalypso-sw
annotate ffstools/tiffs-rd/inode.c @ 232:73372cfdaf7f
tiffs IVA: object name validation implemented
author | Michael Spacefalcon <msokolov@ivan.Harhan.ORG> |
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date | Sun, 26 Jan 2014 08:42:59 +0000 |
parents | 5ceacdbd4490 |
children | ae9ff2d1e3da |
rev | line source |
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1 /* |
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2 * This C module implements the reading and decoding of inode information. |
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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 <endian.h> |
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7 #include <ctype.h> |
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8 #include <stdio.h> |
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9 #include <stdlib.h> |
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10 #include <string.h> |
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11 #include <strings.h> |
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12 #include "types.h" |
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13 #include "struct.h" |
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14 #include "globals.h" |
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15 #include "pathname.h" |
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16 |
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17 u8 blank_flash_line[16] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, |
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18 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF}; |
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19 |
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20 alloc_inode_table() |
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21 { |
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22 inode_info = malloc(sizeof(struct inode_info *) * inode_limit); |
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23 if (!inode_info) { |
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24 perror("malloc of inode table"); |
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25 exit(1); |
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26 } |
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27 bzero(inode_info, sizeof(struct inode_info *) * inode_limit); |
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28 } |
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29 |
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30 static int |
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31 convert_ptr(in, infp) |
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32 int in; |
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33 int *infp; |
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34 { |
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35 if (in == 0xFFFF) { |
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36 *infp = 0; |
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37 return(0); |
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38 } |
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39 if (in < 1 || in >= inode_limit) |
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40 return(-1); |
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41 *infp = in; |
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42 return(1); |
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43 } |
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44 |
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45 validate_inode(ino) |
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46 { |
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47 struct inode_flash *fl; |
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48 struct inode_info *inf; |
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49 |
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50 if (ino < 1 || ino >= inode_limit) |
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51 return(0); |
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52 if (inode_info[ino]) |
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53 return(1); |
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54 fl = (struct inode_flash *)inode_block + ino; |
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55 if (!bcmp(fl, blank_flash_line, sizeof blank_flash_line)) |
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56 return(0); |
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57 inf = malloc(sizeof(struct inode_info)); |
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58 if (!inf) { |
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59 perror("malloc of struct inode_info"); |
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60 exit(1); |
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61 } |
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62 bzero(inf, sizeof(struct inode_info)); |
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63 inf->len = le16toh(fl->len); |
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64 if (inf->len & 0xF) { |
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65 fprintf(stderr, |
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66 "warning: inode #%x: invalid length, skipping\n", ino); |
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67 free(inf); |
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68 return(0); |
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69 } |
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70 inf->type = fl->type; |
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71 switch (inf->type) { |
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72 case 0x00: |
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73 break; |
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74 case 0xE1: |
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75 case 0xF1: |
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76 case 0xF2: |
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77 case 0xF3: |
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78 case 0xF4: |
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79 if (!inf->len) { |
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80 fprintf(stderr, |
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81 "warning: inode #%x: non-deleted object has zero length, skipping\n", |
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82 ino); |
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83 free(inf); |
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84 return(0); |
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85 } |
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86 break; |
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87 default: |
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88 fprintf(stderr, |
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89 "warning: inode #%x: unexpected object type %02X, skipping\n", |
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90 ino, inf->type); |
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91 free(inf); |
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92 return(0); |
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93 } |
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94 if (convert_ptr(le16toh(fl->descend), &inf->descend) < 0) { |
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95 fprintf(stderr, |
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96 "warning: inode #%x: invalid descend pointer, skipping\n", |
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97 ino); |
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98 free(inf); |
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99 return(0); |
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100 } |
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101 if (convert_ptr(le16toh(fl->sibling), &inf->sibling) < 0) { |
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102 fprintf(stderr, |
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103 "warning: inode #%x: invalid sibling pointer, skipping\n", |
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104 ino); |
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105 free(inf); |
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106 return(0); |
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107 } |
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108 if (inf->len) { |
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109 inf->rawloc = le32toh(fl->dataptr); |
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110 if (inf->rawloc > 0x0FFFFFFF) { |
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111 invdptr: fprintf(stderr, |
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112 "warning: inode #%x: invalid data pointer, skipping\n", |
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113 ino); |
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114 free(inf); |
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115 return(0); |
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116 } |
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117 inf->offset = inf->rawloc << 4; |
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118 if (inf->offset >= total_ffs_size) |
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119 goto invdptr; |
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120 if (inf->offset + inf->len > total_ffs_size) { |
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121 fprintf(stderr, |
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122 "warning: inode #%x: data pointer + length > FFS total size, skipping\n", |
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123 ino); |
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124 free(inf); |
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125 return(0); |
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126 } |
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127 inf->dataptr = image + inf->offset; |
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128 } |
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129 inode_info[ino] = inf; |
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130 return(1); |
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131 } |
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132 |
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133 find_root_inode() |
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134 { |
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135 int ino; |
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136 |
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137 if (root_inode) { |
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138 if (!validate_inode(root_inode)) { |
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139 fprintf(stderr, |
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140 "error: root inode specified with -r is invalid\n"); |
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141 exit(1); |
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142 } |
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143 return(1); |
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144 } |
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145 for (ino = 1; ino < inode_limit; ino++) { |
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146 if (!validate_inode(ino)) |
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147 continue; |
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148 if (inode_info[ino]->type != 0xF2) |
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149 continue; |
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150 if (*inode_info[ino]->dataptr != '/') |
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151 continue; |
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152 root_inode = ino; |
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153 if (verbose) |
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154 fprintf(stderr, "Found root inode at #%x\n", ino); |
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155 if (inode_info[ino]->sibling) |
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156 fprintf(stderr, |
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157 "warning: root inode #%x has a non-null sibling pointer\n", |
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158 ino); |
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159 return(0); |
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160 } |
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161 fprintf(stderr, "error: no root inode found; try -r\n"); |
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162 exit(1); |
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163 } |
232
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164 |
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165 validate_obj_name(ino, root_special) |
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166 { |
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167 struct inode_info *inf = inode_info[ino]; |
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168 u8 *p, *endp; |
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169 int c; |
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170 |
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171 if (!inf->len) |
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172 return(0); |
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173 p = inf->dataptr; |
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174 endp = p + inf->len; |
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175 for (; ; p++) { |
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176 if (p >= endp) |
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177 return(0); |
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178 c = *p; |
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179 if (!c) |
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180 break; |
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181 if (c < ' ' || c > '~') |
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182 return(0); |
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183 if (root_special || isalnum(c)) |
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184 continue; |
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185 switch (c) { |
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186 case '.': |
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187 case ',': |
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188 case '_': |
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189 case '-': |
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190 case '+': |
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191 case '%': |
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192 case '$': |
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193 case '#': |
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194 continue; |
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195 default: |
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196 return(0); |
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197 } |
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198 } |
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199 c = p - inf->dataptr; |
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200 if (c < 1 || c > MAX_FN_COMPONENT && !root_special) |
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201 return(0); |
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202 inf->byte_after_name = p + 1; |
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203 return(1); |
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204 } |