1 | /* |
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2 | * Evaluation IMFS Node Support Routines |
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3 | * |
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4 | * COPYRIGHT (c) 1989-1999. |
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5 | * On-Line Applications Research Corporation (OAR). |
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6 | * |
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7 | * The license and distribution terms for this file may be |
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8 | * found in the file LICENSE in this distribution or at |
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9 | * http://www.rtems.com/license/LICENSE. |
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10 | * |
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11 | * $Id$ |
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12 | */ |
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13 | |
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14 | #if HAVE_CONFIG_H |
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15 | #include "config.h" |
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16 | #endif |
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17 | |
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18 | #include <sys/types.h> |
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19 | #include <sys/stat.h> |
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20 | #include <fcntl.h> |
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21 | #include <unistd.h> |
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22 | #include <errno.h> |
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23 | #include <stdlib.h> |
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24 | |
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25 | #include "imfs.h" |
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26 | #include <rtems/libio_.h> |
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27 | #include <rtems/seterr.h> |
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28 | |
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29 | #define RTEMS_LIBIO_PERMS_RX (RTEMS_LIBIO_PERMS_SEARCH | RTEMS_LIBIO_PERMS_READ) |
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30 | #define RTEMS_LIBIO_PERMS_WX (RTEMS_LIBIO_PERMS_SEARCH | RTEMS_LIBIO_PERMS_WRITE) |
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31 | |
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32 | #define MAXSYMLINK 5 |
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33 | |
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34 | int IMFS_Set_handlers( |
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35 | rtems_filesystem_location_info_t *loc |
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36 | ) |
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37 | { |
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38 | IMFS_jnode_t *node = loc->node_access; |
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39 | IMFS_fs_info_t *fs_info; |
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40 | |
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41 | fs_info = loc->mt_entry->fs_info; |
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42 | switch( node->type ) { |
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43 | case IMFS_DIRECTORY: |
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44 | loc->handlers = fs_info->directory_handlers; |
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45 | break; |
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46 | case IMFS_DEVICE: |
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47 | loc->handlers = &IMFS_device_handlers; |
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48 | break; |
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49 | case IMFS_SYM_LINK: |
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50 | case IMFS_HARD_LINK: |
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51 | loc->handlers = &IMFS_link_handlers; |
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52 | break; |
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53 | case IMFS_LINEAR_FILE: |
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54 | loc->handlers = fs_info->memfile_handlers; |
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55 | break; |
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56 | case IMFS_MEMORY_FILE: |
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57 | loc->handlers = fs_info->memfile_handlers; |
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58 | break; |
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59 | case IMFS_FIFO: |
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60 | loc->handlers = fs_info->fifo_handlers; |
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61 | break; |
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62 | } |
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63 | |
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64 | return 0; |
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65 | } |
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66 | |
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67 | /* |
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68 | * IMFS_evaluate_permission |
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69 | * |
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70 | * The following routine evaluates that we have permission |
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71 | * to do flags on the node. |
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72 | */ |
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73 | static int IMFS_evaluate_permission( |
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74 | rtems_filesystem_location_info_t *node, |
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75 | int flags |
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76 | ) |
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77 | { |
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78 | uid_t st_uid; |
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79 | gid_t st_gid; |
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80 | IMFS_jnode_t *jnode; |
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81 | int flags_to_test; |
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82 | |
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83 | if ( !rtems_libio_is_valid_perms( flags ) ) |
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84 | rtems_set_errno_and_return_minus_one( EPERM ); |
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85 | |
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86 | jnode = node->node_access; |
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87 | |
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88 | #if defined(RTEMS_POSIX_API) |
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89 | st_uid = geteuid(); |
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90 | st_gid = getegid(); |
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91 | #else |
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92 | st_uid = jnode->st_uid; |
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93 | st_gid = jnode->st_gid; |
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94 | #endif |
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95 | |
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96 | /* |
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97 | * Check if I am owner or a group member or someone else. |
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98 | */ |
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99 | |
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100 | flags_to_test = flags; |
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101 | |
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102 | if ( st_uid == jnode->st_uid ) |
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103 | flags_to_test <<= 6; |
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104 | else if ( st_gid == jnode->st_gid ) |
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105 | flags_to_test <<= 3; |
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106 | else { |
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107 | /* must be other - do nothing */; |
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108 | } |
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109 | |
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110 | /* |
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111 | * If all of the flags are set we have permission |
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112 | * to do this. |
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113 | */ |
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114 | if ( ( flags_to_test & jnode->st_mode) == flags_to_test ) |
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115 | return 1; |
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116 | |
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117 | return 0; |
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118 | } |
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119 | |
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120 | /* |
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121 | * IMFS_evaluate_hard_link |
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122 | * |
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123 | * The following routine evaluates a hardlink to the actual node. |
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124 | */ |
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125 | |
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126 | static int IMFS_evaluate_hard_link( |
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127 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
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128 | int flags /* IN */ |
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129 | ) |
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130 | { |
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131 | IMFS_jnode_t *jnode = node->node_access; |
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132 | int result = 0; |
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133 | |
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134 | /* |
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135 | * Check for things that should never happen. |
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136 | */ |
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137 | IMFS_assert( jnode->type == IMFS_HARD_LINK ); |
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138 | |
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139 | /* |
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140 | * Set the hard link value and the handlers. |
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141 | */ |
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142 | node->node_access = jnode->info.hard_link.link_node; |
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143 | |
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144 | IMFS_Set_handlers( node ); |
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145 | |
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146 | /* |
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147 | * Verify we have the correct permissions for this node. |
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148 | */ |
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149 | |
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150 | if ( !IMFS_evaluate_permission( node, flags ) ) |
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151 | rtems_set_errno_and_return_minus_one( EACCES ); |
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152 | |
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153 | return result; |
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154 | } |
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155 | |
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156 | |
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157 | /* |
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158 | * IMFS_evaluate_sym_link |
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159 | * |
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160 | * The following routine evaluates a symbolic link to the actual node. |
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161 | */ |
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162 | |
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163 | static int IMFS_evaluate_sym_link( |
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164 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
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165 | int flags /* IN */ |
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166 | ) |
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167 | { |
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168 | IMFS_jnode_t *jnode = node->node_access; |
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169 | int result = 0; |
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170 | int i; |
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171 | |
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172 | /* |
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173 | * Check for things that should never happen. |
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174 | */ |
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175 | IMFS_assert( jnode->type == IMFS_SYM_LINK ); |
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176 | IMFS_assert( jnode->Parent ); |
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177 | |
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178 | /* |
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179 | * Move the node_access to either the symbolic links parent or |
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180 | * root depending on the symbolic links path. |
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181 | */ |
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182 | node->node_access = jnode->Parent; |
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183 | |
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184 | rtems_filesystem_get_sym_start_loc( |
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185 | jnode->info.sym_link.name, |
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186 | &i, |
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187 | node |
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188 | ); |
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189 | |
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190 | /* |
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191 | * Use eval path to evaluate the path of the symbolic link. |
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192 | */ |
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193 | result = IMFS_eval_path( |
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194 | &jnode->info.sym_link.name[i], |
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195 | strlen( &jnode->info.sym_link.name[i] ), |
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196 | flags, |
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197 | node |
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198 | ); |
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199 | |
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200 | IMFS_Set_handlers( node ); |
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201 | |
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202 | /* |
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203 | * Verify we have the correct permissions for this node. |
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204 | */ |
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205 | if ( !IMFS_evaluate_permission( node, flags ) ) |
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206 | rtems_set_errno_and_return_minus_one( EACCES ); |
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207 | |
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208 | return result; |
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209 | } |
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210 | |
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211 | /* |
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212 | * IMFS_evaluate_link |
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213 | * |
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214 | * The following routine returns the real node pointed to by a link. |
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215 | */ |
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216 | int IMFS_evaluate_link( |
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217 | rtems_filesystem_location_info_t *node, /* IN/OUT */ |
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218 | int flags /* IN */ |
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219 | ) |
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220 | { |
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221 | IMFS_jnode_t *jnode; |
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222 | int result = 0; |
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223 | |
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224 | do { |
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225 | jnode = node->node_access; |
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226 | |
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227 | /* |
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228 | * Increment and check the link counter. |
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229 | */ |
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230 | |
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231 | rtems_filesystem_link_counts ++; |
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232 | if ( rtems_filesystem_link_counts > MAXSYMLINK ) { |
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233 | rtems_filesystem_link_counts = 0; |
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234 | rtems_set_errno_and_return_minus_one( ELOOP ); |
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235 | } |
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236 | |
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237 | /* |
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238 | * Follow the Link node. |
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239 | */ |
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240 | |
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241 | if ( jnode->type == IMFS_HARD_LINK ) |
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242 | result = IMFS_evaluate_hard_link( node, flags ); |
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243 | |
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244 | else if (jnode->type == IMFS_SYM_LINK ) |
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245 | result = IMFS_evaluate_sym_link( node, flags ); |
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246 | |
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247 | } while ( ( result == 0 ) && ( ( jnode->type == IMFS_SYM_LINK ) || |
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248 | ( jnode->type == IMFS_HARD_LINK ) ) ); |
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249 | |
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250 | /* |
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251 | * Clear link counter. |
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252 | */ |
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253 | |
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254 | rtems_filesystem_link_counts = 0; |
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255 | |
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256 | return result; |
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257 | } |
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258 | |
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259 | /* |
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260 | * IMFS_skip_separator |
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261 | * |
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262 | * Skip the separator in the path. |
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263 | */ |
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264 | static void IMFS_skip_separator ( |
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265 | const char *path, /* IN */ |
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266 | size_t *len, /* IN/OUT */ |
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267 | int *index /* IN/OUT */ |
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268 | ) |
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269 | { |
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270 | while ( IMFS_is_separator( path[*index] ) && path[*index] && *len ) { |
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271 | ++(*index); |
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272 | --(*len); |
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273 | } |
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274 | } |
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275 | |
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276 | /* |
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277 | * IMFS_evaluate_for_make |
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278 | * |
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279 | * The following routine evaluate path for a new node to be created. |
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280 | * pathloc is returned with a pointer to the parent of the new node. |
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281 | * name is returned with a pointer to the first character in the |
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282 | * new node name. The parent node is verified to be a directory. |
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283 | */ |
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284 | |
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285 | int IMFS_evaluate_for_make( |
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286 | const char *path, /* IN */ |
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287 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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288 | const char **name /* OUT */ |
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289 | ) |
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290 | { |
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291 | int i = 0; |
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292 | int len; |
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293 | IMFS_token_types type; |
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294 | char token[ IMFS_NAME_MAX + 1 ]; |
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295 | IMFS_jnode_t *node; |
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296 | bool done = false; |
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297 | size_t pathlen; |
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298 | int result; |
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299 | |
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300 | /* |
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301 | * This was filled in by the caller and is valid in the |
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302 | * mount table. |
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303 | */ |
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304 | node = pathloc->node_access; |
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305 | |
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306 | /* |
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307 | * Get the path length. |
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308 | */ |
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309 | pathlen = strlen( path ); |
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310 | /* |
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311 | * Evaluate all tokens until we are done or an error occurs. |
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312 | */ |
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313 | |
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314 | while( !done ) { |
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315 | |
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316 | type = IMFS_get_token( &path[i], pathlen, token, &len ); |
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317 | pathlen -= len; |
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318 | i += len; |
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319 | |
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320 | if ( !pathloc->node_access ) |
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321 | rtems_set_errno_and_return_minus_one( ENOENT ); |
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322 | |
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323 | /* |
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324 | * I cannot move out of this directory without execute permission. |
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325 | */ |
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326 | |
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327 | if ( type != IMFS_NO_MORE_PATH ) |
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328 | if ( node->type == IMFS_DIRECTORY ) |
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329 | if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_SEARCH ) ) |
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330 | rtems_set_errno_and_return_minus_one( EACCES ); |
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331 | |
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332 | node = pathloc->node_access; |
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333 | |
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334 | switch( type ) { |
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335 | |
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336 | case IMFS_UP_DIR: |
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337 | /* |
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338 | * Am I at the root of all filesystems? (chroot'ed?) |
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339 | */ |
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340 | |
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341 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) |
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342 | break; /* Throw out the .. in this case */ |
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343 | |
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344 | |
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345 | /* |
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346 | * Am I at the root of this mounted filesystem? |
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347 | */ |
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348 | |
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349 | if ( rtems_filesystem_is_root_location( pathloc ) ) { |
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350 | |
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351 | /* |
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352 | * Am I at the root of all filesystems? |
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353 | */ |
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354 | |
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355 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) { |
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356 | break; |
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357 | |
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358 | } else { |
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359 | *pathloc = pathloc->mt_entry->mt_point_node; |
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360 | return (*pathloc->ops->evalformake_h)( &path[i-len], pathloc, name ); |
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361 | } |
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362 | } else { |
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363 | |
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364 | if ( !node->Parent ) |
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365 | rtems_set_errno_and_return_minus_one( ENOENT ); |
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366 | |
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367 | node = node->Parent; |
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368 | } |
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369 | |
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370 | pathloc->node_access = node; |
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371 | break; |
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372 | |
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373 | case IMFS_NAME: |
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374 | |
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375 | if ( node->type == IMFS_HARD_LINK ) { |
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376 | |
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377 | result = IMFS_evaluate_link( pathloc, 0 ); |
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378 | if ( result == -1 ) |
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379 | return -1; |
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380 | |
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381 | } else if ( node->type == IMFS_SYM_LINK ) { |
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382 | |
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383 | result = IMFS_evaluate_link( pathloc, 0 ); |
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384 | |
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385 | if ( result == -1 ) |
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386 | return -1; |
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387 | } |
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388 | |
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389 | node = pathloc->node_access; |
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390 | if ( !node ) |
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391 | rtems_set_errno_and_return_minus_one( ENOTDIR ); |
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392 | |
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393 | /* |
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394 | * Only a directory can be decended into. |
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395 | */ |
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396 | |
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397 | if ( node->type != IMFS_DIRECTORY ) |
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398 | rtems_set_errno_and_return_minus_one( ENOTDIR ); |
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399 | |
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400 | /* |
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401 | * Find the token name in the present location. |
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402 | */ |
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403 | |
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404 | node = IMFS_find_match_in_dir( node, token ); |
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405 | |
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406 | /* |
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407 | * If there is no node we have found the name of the node we |
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408 | * wish to create. |
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409 | */ |
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410 | |
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411 | if ( ! node ) |
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412 | done = true; |
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413 | else { |
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414 | if (( node->type == IMFS_DIRECTORY ) && ( node->info.directory.mt_fs != NULL )) { |
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415 | IMFS_skip_separator( path, &pathlen, &i); |
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416 | if ((path[i] != '.') || (path[i + 1] != '.')) { |
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417 | *pathloc = node->info.directory.mt_fs->mt_fs_root; |
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418 | return (*pathloc->ops->evalformake_h)( &path[i], |
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419 | pathloc, |
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420 | name ); |
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421 | } |
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422 | i += 2; |
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423 | pathlen -= 2; |
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424 | node = node->Parent; |
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425 | } |
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426 | pathloc->node_access = node; |
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427 | } |
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428 | break; |
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429 | |
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430 | case IMFS_NO_MORE_PATH: |
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431 | rtems_set_errno_and_return_minus_one( EEXIST ); |
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432 | break; |
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433 | |
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434 | case IMFS_INVALID_TOKEN: |
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435 | rtems_set_errno_and_return_minus_one( ENAMETOOLONG ); |
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436 | break; |
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437 | |
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438 | case IMFS_CURRENT_DIR: |
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439 | break; |
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440 | } |
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441 | } |
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442 | |
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443 | *name = &path[ i - len ]; |
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444 | |
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445 | /* |
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446 | * We have evaluated the path as far as we can. |
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447 | * Verify there is not any invalid stuff at the end of the name. |
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448 | */ |
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449 | |
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450 | for( ; path[i] != '\0'; i++) { |
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451 | if ( !IMFS_is_separator( path[ i ] ) ) |
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452 | rtems_set_errno_and_return_minus_one( ENOENT ); |
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453 | } |
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454 | |
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455 | /* |
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456 | * Verify we can execute and write to this directory. |
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457 | */ |
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458 | |
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459 | result = IMFS_Set_handlers( pathloc ); |
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460 | |
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461 | /* |
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462 | * The returned node must be a directory |
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463 | */ |
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464 | node = pathloc->node_access; |
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465 | if ( node->type != IMFS_DIRECTORY ) |
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466 | rtems_set_errno_and_return_minus_one( ENOTDIR ); |
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467 | |
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468 | /* |
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469 | * We must have Write and execute permission on the returned node. |
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470 | */ |
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471 | |
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472 | if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_WX ) ) |
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473 | rtems_set_errno_and_return_minus_one( EACCES ); |
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474 | |
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475 | return result; |
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476 | } |
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477 | |
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478 | /* |
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479 | * IMFS_eval_path |
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480 | * |
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481 | * The following routine evaluate path for a node that wishes to be |
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482 | * accessed with mode. pathloc is returned with a pointer to the |
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483 | * node to be accessed. |
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484 | */ |
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485 | |
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486 | int IMFS_eval_path( |
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487 | const char *pathname, /* IN */ |
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488 | size_t pathnamelen, /* IN */ |
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489 | int flags, /* IN */ |
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490 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */ |
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491 | ) |
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492 | { |
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493 | int i = 0; |
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494 | int len; |
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495 | IMFS_token_types type = IMFS_CURRENT_DIR; |
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496 | char token[ IMFS_NAME_MAX + 1 ]; |
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497 | IMFS_jnode_t *node; |
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498 | int result; |
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499 | |
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500 | if ( !rtems_libio_is_valid_perms( flags ) ) { |
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501 | rtems_set_errno_and_return_minus_one( EIO ); |
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502 | } |
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503 | |
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504 | /* |
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505 | * This was filled in by the caller and is valid in the |
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506 | * mount table. |
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507 | */ |
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508 | |
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509 | node = pathloc->node_access; |
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510 | |
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511 | /* |
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512 | * Evaluate all tokens until we are done or an error occurs. |
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513 | */ |
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514 | |
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515 | while( (type != IMFS_NO_MORE_PATH) && (type != IMFS_INVALID_TOKEN) ) { |
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516 | |
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517 | type = IMFS_get_token( &pathname[i], pathnamelen, token, &len ); |
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518 | pathnamelen -= len; |
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519 | i += len; |
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520 | |
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521 | if ( !pathloc->node_access ) |
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522 | rtems_set_errno_and_return_minus_one( ENOENT ); |
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523 | |
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524 | /* |
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525 | * I cannot move out of this directory without execute permission. |
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526 | */ |
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527 | if ( type != IMFS_NO_MORE_PATH ) |
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528 | if ( node->type == IMFS_DIRECTORY ) |
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529 | if ( !IMFS_evaluate_permission( pathloc, RTEMS_LIBIO_PERMS_SEARCH ) ) |
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530 | rtems_set_errno_and_return_minus_one( EACCES ); |
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531 | |
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532 | node = pathloc->node_access; |
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533 | |
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534 | switch( type ) { |
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535 | case IMFS_UP_DIR: |
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536 | /* |
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537 | * Am I at the root of all filesystems? (chroot'ed?) |
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538 | */ |
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539 | |
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540 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) |
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541 | break; /* Throw out the .. in this case */ |
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542 | |
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543 | /* |
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544 | * Am I at the root of this mounted filesystem? |
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545 | */ |
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546 | |
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547 | if ( rtems_filesystem_is_root_location( pathloc ) ) { |
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548 | |
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549 | /* |
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550 | * Am I at the root of all filesystems? |
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551 | */ |
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552 | |
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553 | if ( pathloc->node_access == rtems_filesystem_root.node_access ) { |
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554 | break; /* Throw out the .. in this case */ |
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555 | } else { |
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556 | *pathloc = pathloc->mt_entry->mt_point_node; |
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557 | return (*pathloc->ops->evalpath_h)(&(pathname[i-len]), |
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558 | pathnamelen+len, |
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559 | flags,pathloc); |
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560 | } |
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561 | } else { |
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562 | |
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563 | if ( !node->Parent ) |
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564 | rtems_set_errno_and_return_minus_one( ENOENT ); |
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565 | |
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566 | node = node->Parent; |
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567 | pathloc->node_access = node; |
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568 | |
---|
569 | } |
---|
570 | |
---|
571 | pathloc->node_access = node; |
---|
572 | break; |
---|
573 | |
---|
574 | case IMFS_NAME: |
---|
575 | /* |
---|
576 | * If we are at a link follow it. |
---|
577 | */ |
---|
578 | if ( node->type == IMFS_HARD_LINK ) { |
---|
579 | IMFS_evaluate_hard_link( pathloc, 0 ); |
---|
580 | node = pathloc->node_access; |
---|
581 | |
---|
582 | /* |
---|
583 | * It would be a design error if we evaluated the link and |
---|
584 | * was broken. |
---|
585 | */ |
---|
586 | IMFS_assert( node ); |
---|
587 | |
---|
588 | } else if ( node->type == IMFS_SYM_LINK ) { |
---|
589 | result = IMFS_evaluate_sym_link( pathloc, 0 ); |
---|
590 | |
---|
591 | /* |
---|
592 | * In contrast to a hard link, it is possible to have a broken |
---|
593 | * symbolic link. |
---|
594 | */ |
---|
595 | node = pathloc->node_access; |
---|
596 | if ( result == -1 ) |
---|
597 | return -1; |
---|
598 | } |
---|
599 | |
---|
600 | /* |
---|
601 | * Only a directory can be decended into. |
---|
602 | */ |
---|
603 | if ( node->type != IMFS_DIRECTORY ) |
---|
604 | rtems_set_errno_and_return_minus_one( ENOTDIR ); |
---|
605 | |
---|
606 | /* |
---|
607 | * Find the token name in the current node. |
---|
608 | */ |
---|
609 | node = IMFS_find_match_in_dir( node, token ); |
---|
610 | if ( !node ) |
---|
611 | rtems_set_errno_and_return_minus_one( ENOENT ); |
---|
612 | |
---|
613 | /* |
---|
614 | * If we are at a node that is a mount point so current directory |
---|
615 | * actually exists on the mounted file system and not in the node that |
---|
616 | * contains the mount point node. For example a stat of the mount |
---|
617 | * point should return the details of the root of the mounted file |
---|
618 | * system not the mount point node of parent file system. |
---|
619 | * |
---|
620 | * If the node we have just moved to is a mount point do not loop and |
---|
621 | * get the token because the token may be suitable for the mounted |
---|
622 | * file system and not the IMFS. For example the IMFS length is |
---|
623 | * limited. If the token is a parent directory move back up otherwise |
---|
624 | * set loc to the new fs root node and let them finish evaluating the |
---|
625 | * path. |
---|
626 | */ |
---|
627 | if (( node->type == IMFS_DIRECTORY ) && ( node->info.directory.mt_fs != NULL )) { |
---|
628 | IMFS_skip_separator( pathname, &pathnamelen, &i); |
---|
629 | if ((pathname[i] != '.') || (pathname[i + 1] != '.')) { |
---|
630 | *pathloc = node->info.directory.mt_fs->mt_fs_root; |
---|
631 | return (*pathloc->ops->evalpath_h)( &pathname[i], |
---|
632 | pathnamelen, |
---|
633 | flags, pathloc ); |
---|
634 | } |
---|
635 | i += 2; |
---|
636 | pathnamelen -= 2; |
---|
637 | node = node->Parent; |
---|
638 | } |
---|
639 | |
---|
640 | /* |
---|
641 | * Set the node access to the point we have found. |
---|
642 | */ |
---|
643 | pathloc->node_access = node; |
---|
644 | break; |
---|
645 | |
---|
646 | case IMFS_NO_MORE_PATH: |
---|
647 | case IMFS_CURRENT_DIR: |
---|
648 | break; |
---|
649 | |
---|
650 | case IMFS_INVALID_TOKEN: |
---|
651 | rtems_set_errno_and_return_minus_one( ENAMETOOLONG ); |
---|
652 | break; |
---|
653 | |
---|
654 | } |
---|
655 | } |
---|
656 | |
---|
657 | /* |
---|
658 | * Always return the root node. |
---|
659 | * |
---|
660 | * If we are at a node that is a mount point. Set loc to the |
---|
661 | * new fs root node and let let the mounted filesystem set the handlers. |
---|
662 | * |
---|
663 | * NOTE: The behavior of stat() on a mount point appears to be questionable. |
---|
664 | */ |
---|
665 | |
---|
666 | if ( node->type == IMFS_DIRECTORY ) { |
---|
667 | if ( node->info.directory.mt_fs != NULL ) { |
---|
668 | *pathloc = node->info.directory.mt_fs->mt_fs_root; |
---|
669 | return (*pathloc->ops->evalpath_h)( &pathname[i-len], |
---|
670 | pathnamelen+len, |
---|
671 | flags, pathloc ); |
---|
672 | } else { |
---|
673 | result = IMFS_Set_handlers( pathloc ); |
---|
674 | } |
---|
675 | } else { |
---|
676 | result = IMFS_Set_handlers( pathloc ); |
---|
677 | } |
---|
678 | |
---|
679 | /* |
---|
680 | * Verify we have the correct permissions for this node. |
---|
681 | */ |
---|
682 | |
---|
683 | if ( !IMFS_evaluate_permission( pathloc, flags ) ) |
---|
684 | rtems_set_errno_and_return_minus_one( EACCES ); |
---|
685 | |
---|
686 | return result; |
---|
687 | } |
---|