1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Evaluation IMFS Node Support |
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5 | * @ingroup IMFS |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-1999. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * Modifications to support reference counting in the file system are |
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13 | * Copyright (c) 2012 embedded brains GmbH. |
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14 | * |
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15 | * The license and distribution terms for this file may be |
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16 | * found in the file LICENSE in this distribution or at |
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17 | * http://www.rtems.org/license/LICENSE. |
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18 | */ |
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19 | |
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20 | #if HAVE_CONFIG_H |
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21 | #include "config.h" |
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22 | #endif |
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23 | |
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24 | #include "imfs.h" |
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25 | |
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26 | #include <string.h> |
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27 | |
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28 | static bool IMFS_eval_is_directory( |
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29 | rtems_filesystem_eval_path_context_t *ctx, |
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30 | void *arg |
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31 | ) |
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32 | { |
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33 | rtems_filesystem_location_info_t *currentloc = |
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34 | rtems_filesystem_eval_path_get_currentloc( ctx ); |
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35 | IMFS_jnode_t *node = currentloc->node_access; |
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36 | |
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37 | return IMFS_is_directory( node ); |
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38 | } |
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39 | |
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40 | static IMFS_jnode_t *IMFS_search_in_directory( |
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41 | IMFS_directory_t *dir, |
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42 | const char *token, |
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43 | size_t tokenlen |
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44 | ) |
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45 | { |
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46 | if ( rtems_filesystem_is_current_directory( token, tokenlen ) ) { |
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47 | return &dir->Node; |
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48 | } else { |
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49 | if ( rtems_filesystem_is_parent_directory( token, tokenlen ) ) { |
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50 | return dir->Node.Parent; |
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51 | } else { |
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52 | rtems_chain_control *entries = &dir->Entries; |
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53 | rtems_chain_node *current = rtems_chain_first( entries ); |
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54 | rtems_chain_node *tail = rtems_chain_tail( entries ); |
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55 | |
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56 | while ( current != tail ) { |
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57 | IMFS_jnode_t *entry = (IMFS_jnode_t *) current; |
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58 | bool match = entry->namelen == tokenlen |
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59 | && memcmp( entry->name, token, tokenlen ) == 0; |
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60 | |
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61 | if ( match ) { |
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62 | return entry; |
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63 | } |
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64 | |
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65 | current = rtems_chain_next( current ); |
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66 | } |
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67 | |
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68 | return NULL; |
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69 | } |
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70 | } |
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71 | } |
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72 | |
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73 | static rtems_filesystem_global_location_t **IMFS_is_mount_point( |
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74 | IMFS_jnode_t *node, |
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75 | mode_t mode |
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76 | ) |
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77 | { |
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78 | rtems_filesystem_global_location_t **fs_root_ptr = NULL; |
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79 | |
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80 | if ( S_ISDIR( mode ) ) { |
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81 | IMFS_directory_t *dir = (IMFS_directory_t *) node; |
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82 | |
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83 | if ( dir->mt_fs != NULL ) { |
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84 | fs_root_ptr = &dir->mt_fs->mt_fs_root; |
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85 | } |
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86 | } |
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87 | |
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88 | return fs_root_ptr; |
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89 | } |
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90 | |
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91 | static rtems_filesystem_eval_path_generic_status IMFS_eval_token( |
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92 | rtems_filesystem_eval_path_context_t *ctx, |
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93 | void *arg, |
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94 | const char *token, |
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95 | size_t tokenlen |
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96 | ) |
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97 | { |
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98 | rtems_filesystem_eval_path_generic_status status = |
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99 | RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_DONE; |
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100 | rtems_filesystem_location_info_t *currentloc = |
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101 | rtems_filesystem_eval_path_get_currentloc( ctx ); |
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102 | IMFS_directory_t *dir = currentloc->node_access; |
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103 | bool access_ok = rtems_filesystem_eval_path_check_access( |
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104 | ctx, |
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105 | RTEMS_FS_PERMS_EXEC, |
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106 | dir->Node.st_mode, |
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107 | dir->Node.st_uid, |
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108 | dir->Node.st_gid |
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109 | ); |
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110 | |
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111 | if ( access_ok ) { |
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112 | IMFS_jnode_t *entry = IMFS_search_in_directory( dir, token, tokenlen ); |
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113 | |
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114 | if ( entry != NULL ) { |
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115 | bool terminal = !rtems_filesystem_eval_path_has_path( ctx ); |
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116 | int eval_flags = rtems_filesystem_eval_path_get_flags( ctx ); |
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117 | bool follow_hard_link = (eval_flags & RTEMS_FS_FOLLOW_HARD_LINK) != 0; |
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118 | bool follow_sym_link = (eval_flags & RTEMS_FS_FOLLOW_SYM_LINK) != 0; |
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119 | mode_t mode = entry->st_mode; |
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120 | |
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121 | rtems_filesystem_eval_path_clear_token( ctx ); |
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122 | |
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123 | if ( IMFS_is_hard_link( mode ) && ( follow_hard_link || !terminal ) ) { |
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124 | const IMFS_link_t *hard_link = (const IMFS_link_t *) entry; |
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125 | |
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126 | entry = hard_link->link_node; |
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127 | } |
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128 | |
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129 | if ( S_ISLNK( mode ) && ( follow_sym_link || !terminal ) ) { |
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130 | const IMFS_sym_link_t *sym_link = (const IMFS_sym_link_t *) entry; |
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131 | const char *target = sym_link->name; |
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132 | |
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133 | rtems_filesystem_eval_path_recursive( ctx, target, strlen( target ) ); |
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134 | } else { |
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135 | rtems_filesystem_global_location_t **fs_root_ptr = |
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136 | IMFS_is_mount_point( entry, mode ); |
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137 | |
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138 | if ( fs_root_ptr == NULL ) { |
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139 | --dir->Node.reference_count; |
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140 | ++entry->reference_count; |
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141 | currentloc->node_access = entry; |
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142 | currentloc->node_access_2 = |
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143 | IMFS_generic_get_context_by_node( entry ); |
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144 | IMFS_Set_handlers( currentloc ); |
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145 | |
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146 | if ( !terminal ) { |
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147 | status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_CONTINUE; |
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148 | } |
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149 | } else { |
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150 | access_ok = rtems_filesystem_eval_path_check_access( |
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151 | ctx, |
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152 | RTEMS_FS_PERMS_EXEC, |
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153 | entry->st_mode, |
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154 | entry->st_uid, |
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155 | entry->st_gid |
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156 | ); |
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157 | if ( access_ok ) { |
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158 | rtems_filesystem_eval_path_restart( ctx, fs_root_ptr ); |
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159 | } |
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160 | } |
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161 | } |
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162 | } else { |
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163 | status = RTEMS_FILESYSTEM_EVAL_PATH_GENERIC_NO_ENTRY; |
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164 | } |
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165 | } |
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166 | |
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167 | return status; |
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168 | } |
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169 | |
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170 | static const rtems_filesystem_eval_path_generic_config IMFS_eval_config = { |
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171 | .is_directory = IMFS_eval_is_directory, |
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172 | .eval_token = IMFS_eval_token |
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173 | }; |
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174 | |
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175 | void IMFS_eval_path( rtems_filesystem_eval_path_context_t *ctx ) |
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176 | { |
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177 | rtems_filesystem_eval_path_generic( ctx, NULL, &IMFS_eval_config ); |
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178 | } |
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