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