2 * Copyright (C) 2008 Michael Brown <mbrown@fensystems.co.uk>.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * License, or any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
20 FILE_LICENCE ( GPL2_OR_LATER );
32 #include <ipxe/ipv6.h>
33 #include <ipxe/vsprintf.h>
34 #include <ipxe/dhcp.h>
35 #include <ipxe/uuid.h>
37 #include <ipxe/base16.h>
39 #include <ipxe/init.h>
40 #include <ipxe/version.h>
41 #include <ipxe/settings.h>
45 * Configuration settings
49 /******************************************************************************
51 * Generic settings blocks
53 ******************************************************************************
60 struct generic_setting {
61 /** List of generic settings */
62 struct list_head list;
64 struct setting setting;
65 /** Size of setting name */
67 /** Size of setting data */
72 * Get generic setting name
74 * @v generic Generic setting
75 * @ret name Generic setting name
77 static inline void * generic_setting_name ( struct generic_setting *generic ) {
78 return ( ( ( void * ) generic ) + sizeof ( *generic ) );
82 * Get generic setting data
84 * @v generic Generic setting
85 * @ret data Generic setting data
87 static inline void * generic_setting_data ( struct generic_setting *generic ) {
88 return ( ( ( void * ) generic ) + sizeof ( *generic ) +
93 * Find generic setting
95 * @v generics Generic settings block
96 * @v setting Setting to find
97 * @ret generic Generic setting, or NULL
99 static struct generic_setting *
100 find_generic_setting ( struct generic_settings *generics,
101 const struct setting *setting ) {
102 struct generic_setting *generic;
104 list_for_each_entry ( generic, &generics->list, list ) {
105 if ( setting_cmp ( &generic->setting, setting ) == 0 )
112 * Store value of generic setting
114 * @v settings Settings block
115 * @v setting Setting to store
116 * @v data Setting data, or NULL to clear setting
117 * @v len Length of setting data
118 * @ret rc Return status code
120 int generic_settings_store ( struct settings *settings,
121 const struct setting *setting,
122 const void *data, size_t len ) {
123 struct generic_settings *generics =
124 container_of ( settings, struct generic_settings, settings );
125 struct generic_setting *old;
126 struct generic_setting *new = NULL;
129 /* Identify existing generic setting, if any */
130 old = find_generic_setting ( generics, setting );
132 /* Create new generic setting, if required */
134 /* Allocate new generic setting */
135 name_len = ( strlen ( setting->name ) + 1 );
136 new = zalloc ( sizeof ( *new ) + name_len + len );
140 /* Populate new generic setting */
141 new->name_len = name_len;
143 memcpy ( &new->setting, setting, sizeof ( new->setting ) );
144 new->setting.name = generic_setting_name ( new );
145 memcpy ( generic_setting_name ( new ),
146 setting->name, name_len );
147 memcpy ( generic_setting_data ( new ), data, len );
150 /* Delete existing generic setting, if any */
152 list_del ( &old->list );
156 /* Add new setting to list, if any */
158 list_add ( &new->list, &generics->list );
164 * Fetch value of generic setting
166 * @v settings Settings block
167 * @v setting Setting to fetch
168 * @v data Buffer to fill with setting data
169 * @v len Length of buffer
170 * @ret len Length of setting data, or negative error
172 int generic_settings_fetch ( struct settings *settings,
173 struct setting *setting,
174 void *data, size_t len ) {
175 struct generic_settings *generics =
176 container_of ( settings, struct generic_settings, settings );
177 struct generic_setting *generic;
179 /* Find generic setting */
180 generic = find_generic_setting ( generics, setting );
184 /* Copy out generic setting data */
185 if ( len > generic->data_len )
186 len = generic->data_len;
187 memcpy ( data, generic_setting_data ( generic ), len );
189 /* Set setting type, if not yet specified */
190 if ( ! setting->type )
191 setting->type = generic->setting.type;
193 return generic->data_len;
197 * Clear generic settings block
199 * @v settings Settings block
201 void generic_settings_clear ( struct settings *settings ) {
202 struct generic_settings *generics =
203 container_of ( settings, struct generic_settings, settings );
204 struct generic_setting *generic;
205 struct generic_setting *tmp;
207 list_for_each_entry_safe ( generic, tmp, &generics->list, list ) {
208 list_del ( &generic->list );
211 assert ( list_empty ( &generics->list ) );
214 /** Generic settings operations */
215 struct settings_operations generic_settings_operations = {
216 .store = generic_settings_store,
217 .fetch = generic_settings_fetch,
218 .clear = generic_settings_clear,
221 /******************************************************************************
223 * Registered settings blocks
225 ******************************************************************************
228 /** Root generic settings block */
229 struct generic_settings generic_settings_root = {
234 LIST_HEAD_INIT ( generic_settings_root.settings.siblings ),
236 LIST_HEAD_INIT ( generic_settings_root.settings.children ),
237 .op = &generic_settings_operations,
239 .list = LIST_HEAD_INIT ( generic_settings_root.list ),
242 /** Root settings block */
243 #define settings_root generic_settings_root.settings
245 /** Autovivified settings block */
246 struct autovivified_settings {
247 /** Reference count */
248 struct refcnt refcnt;
249 /** Generic settings block */
250 struct generic_settings generic;
254 * Free autovivified settings block
256 * @v refcnt Reference count
258 static void autovivified_settings_free ( struct refcnt *refcnt ) {
259 struct autovivified_settings *autovivified =
260 container_of ( refcnt, struct autovivified_settings, refcnt );
262 generic_settings_clear ( &autovivified->generic.settings );
263 free ( autovivified );
267 * Find child settings block
269 * @v parent Parent settings block
270 * @v name Name within this parent
271 * @ret settings Settings block, or NULL
273 struct settings * find_child_settings ( struct settings *parent,
275 struct settings *settings;
277 /* Find target parent settings block */
278 parent = settings_target ( parent );
280 /* Treat empty name as meaning "this block" */
284 /* Look for child with matching name */
285 list_for_each_entry ( settings, &parent->children, siblings ) {
286 if ( strcmp ( settings->name, name ) == 0 )
287 return settings_target ( settings );
294 * Find or create child settings block
296 * @v parent Parent settings block
297 * @v name Name within this parent
298 * @ret settings Settings block, or NULL
300 struct settings * autovivify_child_settings ( struct settings *parent,
303 struct autovivified_settings autovivified;
304 char name[ strlen ( name ) + 1 /* NUL */ ];
306 struct settings *settings;
308 /* Find target parent settings block */
309 parent = settings_target ( parent );
311 /* Return existing settings, if existent */
312 if ( ( settings = find_child_settings ( parent, name ) ) != NULL )
315 /* Create new generic settings block */
316 new_child = zalloc ( sizeof ( *new_child ) );
318 DBGC ( parent, "Settings %p could not create child %s\n",
322 memcpy ( new_child->name, name, sizeof ( new_child->name ) );
323 ref_init ( &new_child->autovivified.refcnt,
324 autovivified_settings_free );
325 generic_settings_init ( &new_child->autovivified.generic,
326 &new_child->autovivified.refcnt );
327 settings = &new_child->autovivified.generic.settings;
328 register_settings ( settings, parent, new_child->name );
333 * Return settings block name
335 * @v settings Settings block
336 * @ret name Settings block name
338 const char * settings_name ( struct settings *settings ) {
340 char tmp[ sizeof ( buf ) ];
342 /* Find target settings block */
343 settings = settings_target ( settings );
346 for ( buf[2] = buf[0] = 0 ; settings ; settings = settings->parent ) {
347 memcpy ( tmp, buf, sizeof ( tmp ) );
348 snprintf ( buf, sizeof ( buf ), ".%s%s", settings->name, tmp );
354 * Parse settings block name
357 * @v get_child Function to find or create child settings block
358 * @ret settings Settings block, or NULL
360 static struct settings *
361 parse_settings_name ( const char *name, get_child_settings_t get_child ) {
362 struct settings *settings = &settings_root;
363 char name_copy[ strlen ( name ) + 1 ];
367 /* Create modifiable copy of name */
368 memcpy ( name_copy, name, sizeof ( name_copy ) );
369 remainder = name_copy;
371 /* Parse each name component in turn */
372 while ( remainder ) {
374 remainder = strchr ( subname, '.' );
376 *(remainder++) = '\0';
377 settings = get_child ( settings, subname );
386 * Find settings block
389 * @ret settings Settings block, or NULL
391 struct settings * find_settings ( const char *name ) {
393 return parse_settings_name ( name, find_child_settings );
399 * @ret rc Return status code
401 static int apply_settings ( void ) {
402 struct settings_applicator *applicator;
405 /* Call all settings applicators */
406 for_each_table_entry ( applicator, SETTINGS_APPLICATORS ) {
407 if ( ( rc = applicator->apply() ) != 0 ) {
408 DBG ( "Could not apply settings using applicator "
409 "%p: %s\n", applicator, strerror ( rc ) );
418 * Reprioritise settings
420 * @v settings Settings block
422 * Reorders the settings block amongst its siblings according to its
425 static void reprioritise_settings ( struct settings *settings ) {
426 struct settings *parent = settings->parent;
428 struct settings *tmp;
431 /* Stop when we reach the top of the tree */
435 /* Read priority, if present */
436 priority = fetch_intz_setting ( settings, &priority_setting );
438 /* Remove from siblings list */
439 list_del ( &settings->siblings );
441 /* Reinsert after any existing blocks which have a higher priority */
442 list_for_each_entry ( tmp, &parent->children, siblings ) {
443 tmp_priority = fetch_intz_setting ( tmp, &priority_setting );
444 if ( priority > tmp_priority )
447 list_add_tail ( &settings->siblings, &tmp->siblings );
449 /* Recurse up the tree */
450 reprioritise_settings ( parent );
454 * Register settings block
456 * @v settings Settings block
457 * @v parent Parent settings block, or NULL
458 * @v name Settings block name
459 * @ret rc Return status code
461 int register_settings ( struct settings *settings, struct settings *parent,
463 struct settings *old_settings;
466 assert ( settings != NULL );
468 /* Find target parent settings block */
469 parent = settings_target ( parent );
471 /* Apply settings block name */
472 settings->name = name;
474 /* Remove any existing settings with the same name */
475 if ( ( old_settings = find_child_settings ( parent, settings->name ) ))
476 unregister_settings ( old_settings );
478 /* Add to list of settings */
479 ref_get ( settings->refcnt );
480 ref_get ( parent->refcnt );
481 settings->parent = parent;
482 list_add_tail ( &settings->siblings, &parent->children );
483 DBGC ( settings, "Settings %p (\"%s\") registered\n",
484 settings, settings_name ( settings ) );
486 /* Fix up settings priority */
487 reprioritise_settings ( settings );
489 /* Apply potentially-updated settings */
496 * Unregister settings block
498 * @v settings Settings block
500 void unregister_settings ( struct settings *settings ) {
501 struct settings *child;
502 struct settings *tmp;
504 /* Unregister child settings */
505 list_for_each_entry_safe ( child, tmp, &settings->children, siblings ) {
506 unregister_settings ( child );
509 DBGC ( settings, "Settings %p (\"%s\") unregistered\n",
510 settings, settings_name ( settings ) );
512 /* Remove from list of settings */
513 ref_put ( settings->parent->refcnt );
514 settings->parent = NULL;
515 list_del ( &settings->siblings );
516 ref_put ( settings->refcnt );
518 /* Apply potentially-updated settings */
522 /******************************************************************************
524 * Core settings routines
526 ******************************************************************************
530 * Redirect to target settings block
532 * @v settings Settings block, or NULL
533 * @ret settings Underlying settings block
535 struct settings * settings_target ( struct settings *settings ) {
537 /* NULL settings implies the global settings root */
539 settings = &settings_root;
541 /* Redirect to underlying settings block, if applicable */
542 if ( settings->op->redirect )
543 return settings->op->redirect ( settings );
545 /* Otherwise, return this settings block */
550 * Check applicability of setting
552 * @v settings Settings block
554 * @ret applies Setting applies within this settings block
556 int setting_applies ( struct settings *settings,
557 const struct setting *setting ) {
559 /* Find target settings block */
560 settings = settings_target ( settings );
562 /* Check applicability of setting */
563 return ( settings->op->applies ?
564 settings->op->applies ( settings, setting ) : 1 );
568 * Find setting applicable to settings block, if any
570 * @v settings Settings block
572 * @ret setting Applicable setting, if any
574 static const struct setting *
575 applicable_setting ( struct settings *settings, const struct setting *setting ){
576 const struct setting *applicable;
578 /* If setting is already applicable, use it */
579 if ( setting_applies ( settings, setting ) )
582 /* Otherwise, look for a matching predefined setting which does apply */
583 for_each_table_entry ( applicable, SETTINGS ) {
584 if ( ( setting_cmp ( setting, applicable ) == 0 ) &&
585 ( setting_applies ( settings, applicable ) ) )
593 * Store value of setting
595 * @v settings Settings block, or NULL
596 * @v setting Setting to store
597 * @v data Setting data, or NULL to clear setting
598 * @v len Length of setting data
599 * @ret rc Return status code
601 int store_setting ( struct settings *settings, const struct setting *setting,
602 const void *data, size_t len ) {
605 /* Find target settings block */
606 settings = settings_target ( settings );
608 /* Fail if setting does not apply to this settings block */
609 if ( ! setting_applies ( settings, setting ) )
613 if ( ! settings->op->store )
617 if ( ( rc = settings->op->store ( settings, setting,
621 /* Reprioritise settings if necessary */
622 if ( setting_cmp ( setting, &priority_setting ) == 0 )
623 reprioritise_settings ( settings );
625 /* If these settings are registered, apply potentially-updated
628 for ( ; settings ; settings = settings->parent ) {
629 if ( settings == &settings_root ) {
630 if ( ( rc = apply_settings() ) != 0 )
642 * @v settings Settings block, or NULL to search all blocks
643 * @v setting Setting to fetch
644 * @v origin Origin of setting to fill in, or NULL
645 * @v fetched Fetched setting to fill in, or NULL
646 * @v data Buffer to fill with setting data
647 * @v len Length of buffer
648 * @ret len Length of setting data, or negative error
650 * The actual length of the setting will be returned even if
651 * the buffer was too small.
653 int fetch_setting ( struct settings *settings, const struct setting *setting,
654 struct settings **origin, struct setting *fetched,
655 void *data, size_t len ) {
656 const struct setting *applicable;
657 struct settings *child;
661 /* Avoid returning uninitialised data on error */
662 memset ( data, 0, len );
666 memcpy ( fetched, setting, sizeof ( *fetched ) );
668 /* Find target settings block */
669 settings = settings_target ( settings );
672 if ( ! settings->op->fetch )
675 /* Try this block first, if an applicable setting exists */
676 if ( ( applicable = applicable_setting ( settings, setting ) ) ) {
678 /* Create modifiable copy of setting */
679 memcpy ( &tmp, applicable, sizeof ( tmp ) );
680 if ( ( ret = settings->op->fetch ( settings, &tmp,
681 data, len ) ) >= 0 ) {
683 /* Default to string type, if not yet specified */
685 tmp.type = &setting_type_string;
687 /* Record origin, if applicable */
691 /* Record fetched setting, if applicable */
693 memcpy ( fetched, &tmp, sizeof ( *fetched ) );
699 /* Recurse into each child block in turn */
700 list_for_each_entry ( child, &settings->children, siblings ) {
701 if ( ( ret = fetch_setting ( child, setting, origin, fetched,
710 * Fetch allocated copy of setting
712 * @v settings Settings block, or NULL to search all blocks
713 * @v setting Setting to fetch
714 * @v origin Origin of setting to fill in, or NULL
715 * @v fetched Fetched setting to fill in, or NULL
716 * @v data Buffer to allocate and fill with setting data
717 * @v alloc Allocation function
718 * @ret len Length of setting, or negative error
720 * The caller is responsible for eventually freeing the allocated
723 static int fetch_setting_alloc ( struct settings *settings,
724 const struct setting *setting,
725 struct settings **origin,
726 struct setting *fetched,
728 void * ( * alloc ) ( size_t len ) ) {
729 struct settings *tmp_origin;
730 struct setting tmp_fetched;
734 /* Use local buffers if necessary */
736 origin = &tmp_origin;
738 fetched = &tmp_fetched;
740 /* Avoid returning uninitialised data on error */
743 /* Check existence, and fetch setting length */
744 len = fetch_setting ( settings, setting, origin, fetched, NULL, 0 );
748 /* Allocate buffer */
749 *data = alloc ( len );
753 /* Fetch setting value */
754 check_len = fetch_setting ( *origin, fetched, NULL, NULL, *data, len );
755 assert ( check_len == len );
760 * Fetch copy of setting
762 * @v settings Settings block, or NULL to search all blocks
763 * @v setting Setting to fetch
764 * @v origin Origin of setting to fill in, or NULL
765 * @v fetched Fetched setting to fill in, or NULL
766 * @v data Buffer to allocate and fill with setting data
767 * @ret len Length of setting, or negative error
769 * The caller is responsible for eventually freeing the allocated
772 int fetch_setting_copy ( struct settings *settings,
773 const struct setting *setting,
774 struct settings **origin, struct setting *fetched,
777 return fetch_setting_alloc ( settings, setting, origin, fetched,
782 * Fetch value of setting
784 * @v settings Settings block, or NULL to search all blocks
785 * @v setting Setting to fetch
786 * @v data Buffer to fill with setting string data
787 * @v len Length of buffer
788 * @ret len Length of setting, or negative error
790 int fetch_raw_setting ( struct settings *settings,
791 const struct setting *setting,
792 void *data, size_t len ) {
794 return fetch_setting ( settings, setting, NULL, NULL, data, len );
798 * Fetch value of setting
800 * @v settings Settings block, or NULL to search all blocks
801 * @v setting Setting to fetch
802 * @v data Buffer to allocate and fill with setting data
803 * @ret len Length of setting, or negative error
805 * The caller is responsible for eventually freeing the allocated
808 int fetch_raw_setting_copy ( struct settings *settings,
809 const struct setting *setting,
812 return fetch_setting_copy ( settings, setting, NULL, NULL, data );
816 * Fetch value of string setting
818 * @v settings Settings block, or NULL to search all blocks
819 * @v setting Setting to fetch
820 * @v data Buffer to fill with setting string data
821 * @v len Length of buffer
822 * @ret len Length of string setting, or negative error
824 * The resulting string is guaranteed to be correctly NUL-terminated.
825 * The returned length will be the length of the underlying setting
828 int fetch_string_setting ( struct settings *settings,
829 const struct setting *setting,
830 char *data, size_t len ) {
832 memset ( data, 0, len );
833 return fetch_raw_setting ( settings, setting, data,
834 ( ( len > 0 ) ? ( len - 1 ) : 0 ) );
838 * Allocate memory for copy of string setting
840 * @v len Length of setting
841 * @ret ptr Allocated memory
843 static void * fetch_string_setting_copy_alloc ( size_t len ) {
844 return zalloc ( len + 1 /* NUL */ );
848 * Fetch value of string setting
850 * @v settings Settings block, or NULL to search all blocks
851 * @v setting Setting to fetch
852 * @v data Buffer to allocate and fill with setting string data
853 * @ret len Length of string setting, or negative error
855 * The resulting string is guaranteed to be correctly NUL-terminated.
856 * The returned length will be the length of the underlying setting
857 * data. The caller is responsible for eventually freeing the
860 int fetch_string_setting_copy ( struct settings *settings,
861 const struct setting *setting, char **data ) {
863 return fetch_setting_alloc ( settings, setting, NULL, NULL,
864 ( ( void ** ) data ),
865 fetch_string_setting_copy_alloc );
869 * Fetch value of IPv4 address setting
871 * @v settings Settings block, or NULL to search all blocks
872 * @v setting Setting to fetch
873 * @v inp IPv4 addresses to fill in
874 * @v count Maximum number of IPv4 addresses
875 * @ret len Length of setting, or negative error
877 int fetch_ipv4_array_setting ( struct settings *settings,
878 const struct setting *setting,
879 struct in_addr *inp, unsigned int count ) {
882 len = fetch_raw_setting ( settings, setting, inp,
883 ( sizeof ( *inp ) * count ) );
886 if ( ( len % sizeof ( *inp ) ) != 0 )
892 * Fetch value of IPv4 address setting
894 * @v settings Settings block, or NULL to search all blocks
895 * @v setting Setting to fetch
896 * @v inp IPv4 address to fill in
897 * @ret len Length of setting, or negative error
899 int fetch_ipv4_setting ( struct settings *settings,
900 const struct setting *setting,
901 struct in_addr *inp ) {
903 return fetch_ipv4_array_setting ( settings, setting, inp, 1 );
907 * Fetch value of IPv6 address setting
909 * @v settings Settings block, or NULL to search all blocks
910 * @v setting Setting to fetch
911 * @v inp IPv6 addresses to fill in
912 * @v count Maximum number of IPv6 addresses
913 * @ret len Length of setting, or negative error
915 int fetch_ipv6_array_setting ( struct settings *settings,
916 const struct setting *setting,
917 struct in6_addr *inp, unsigned int count ) {
920 len = fetch_raw_setting ( settings, setting, inp,
921 ( sizeof ( *inp ) * count ) );
924 if ( ( len % sizeof ( *inp ) ) != 0 )
930 * Fetch value of IPv6 address setting
932 * @v settings Settings block, or NULL to search all blocks
933 * @v setting Setting to fetch
934 * @v inp IPv6 address to fill in
935 * @ret len Length of setting, or negative error
937 int fetch_ipv6_setting ( struct settings *settings,
938 const struct setting *setting,
939 struct in6_addr *inp ) {
941 return fetch_ipv6_array_setting ( settings, setting, inp, 1 );
945 * Extract numeric value of setting
947 * @v is_signed Treat value as a signed integer
948 * @v raw Raw setting data
949 * @v len Length of raw setting data
950 * @ret value Numeric value
951 * @ret len Length of setting, or negative error
953 static int numeric_setting_value ( int is_signed, const void *raw, size_t len,
954 unsigned long *value ) {
955 const uint8_t *unsigned_bytes = raw;
956 const int8_t *signed_bytes = raw;
962 /* Convert to host-ordered longs */
963 is_negative = ( len && ( signed_bytes[0] < 0 ) );
964 *value = ( ( is_signed && is_negative ) ? -1L : 0 );
966 for ( i = 0 ; i < len ; i++ ) {
967 byte = unsigned_bytes[i];
968 *value = ( ( *value << 8 ) | byte );
969 if ( ( ( i + sizeof ( *value ) ) < len ) && ( byte != pad ) )
977 * Fetch value of numeric setting
979 * @v settings Settings block, or NULL to search all blocks
980 * @v setting Setting to fetch
981 * @v value Integer value to fill in
982 * @ret len Length of setting, or negative error
984 int fetch_numeric_setting ( struct settings *settings,
985 const struct setting *setting,
986 unsigned long *value, int is_signed ) {
990 /* Avoid returning uninitialised data on error */
993 /* Fetch raw (network-ordered, variable-length) setting */
994 len = fetch_raw_setting ( settings, setting, &tmp, sizeof ( tmp ) );
998 /* Extract numeric value */
999 return numeric_setting_value ( is_signed, &tmp, len, value );
1003 * Fetch value of signed integer setting
1005 * @v settings Settings block, or NULL to search all blocks
1006 * @v setting Setting to fetch
1007 * @v value Integer value to fill in
1008 * @ret len Length of setting, or negative error
1010 int fetch_int_setting ( struct settings *settings,
1011 const struct setting *setting,
1014 return fetch_numeric_setting ( settings, setting,
1015 ( ( unsigned long * ) value ), 1 );
1019 * Fetch value of unsigned integer setting
1021 * @v settings Settings block, or NULL to search all blocks
1022 * @v setting Setting to fetch
1023 * @v value Integer value to fill in
1024 * @ret len Length of setting, or negative error
1026 int fetch_uint_setting ( struct settings *settings,
1027 const struct setting *setting,
1028 unsigned long *value ) {
1030 return fetch_numeric_setting ( settings, setting, value, 0 );
1034 * Fetch value of signed integer setting, or zero
1036 * @v settings Settings block, or NULL to search all blocks
1037 * @v setting Setting to fetch
1038 * @ret value Setting value, or zero
1040 long fetch_intz_setting ( struct settings *settings,
1041 const struct setting *setting ) {
1042 unsigned long value;
1044 fetch_numeric_setting ( settings, setting, &value, 1 );
1049 * Fetch value of unsigned integer setting, or zero
1051 * @v settings Settings block, or NULL to search all blocks
1052 * @v setting Setting to fetch
1053 * @ret value Setting value, or zero
1055 unsigned long fetch_uintz_setting ( struct settings *settings,
1056 const struct setting *setting ) {
1057 unsigned long value;
1059 fetch_numeric_setting ( settings, setting, &value, 0 );
1064 * Fetch value of UUID setting
1066 * @v settings Settings block, or NULL to search all blocks
1067 * @v setting Setting to fetch
1068 * @v uuid UUID to fill in
1069 * @ret len Length of setting, or negative error
1071 int fetch_uuid_setting ( struct settings *settings,
1072 const struct setting *setting,
1073 union uuid *uuid ) {
1076 len = fetch_raw_setting ( settings, setting, uuid, sizeof ( *uuid ) );
1079 if ( len != sizeof ( *uuid ) )
1085 * Clear settings block
1087 * @v settings Settings block
1089 void clear_settings ( struct settings *settings ) {
1091 /* Find target settings block */
1092 settings = settings_target ( settings );
1094 /* Clear settings, if applicable */
1095 if ( settings->op->clear )
1096 settings->op->clear ( settings );
1100 * Compare two settings
1102 * @v a Setting to compare
1103 * @v b Setting to compare
1104 * @ret 0 Settings are the same
1105 * @ret non-zero Settings are not the same
1107 int setting_cmp ( const struct setting *a, const struct setting *b ) {
1109 /* If the settings have tags, compare them */
1110 if ( a->tag && ( a->tag == b->tag ) && ( a->scope == b->scope ) )
1113 /* Otherwise, if the settings have names, compare them */
1114 if ( a->name && b->name && a->name[0] )
1115 return strcmp ( a->name, b->name );
1117 /* Otherwise, return a non-match */
1121 /******************************************************************************
1123 * Formatted setting routines
1125 ******************************************************************************
1129 * Format setting value as a string
1131 * @v type Setting type
1132 * @v raw Raw setting value
1133 * @v raw_len Length of raw setting value
1134 * @v buf Buffer to contain formatted value
1135 * @v len Length of buffer
1136 * @ret len Length of formatted value, or negative error
1138 int setting_format ( const struct setting_type *type, const void *raw,
1139 size_t raw_len, char *buf, size_t len ) {
1142 if ( ! type->format )
1145 return type->format ( type, raw, raw_len, buf, len );
1149 * Parse formatted string to setting value
1151 * @v type Setting type
1152 * @v value Formatted setting value
1153 * @v buf Buffer to contain raw value
1154 * @v len Length of buffer
1155 * @ret len Length of raw value, or negative error
1157 int setting_parse ( const struct setting_type *type, const char *value,
1158 void *buf, size_t len ) {
1161 if ( ! type->parse )
1164 return type->parse ( type, value, buf, len );
1168 * Convert setting value to number
1170 * @v type Setting type
1171 * @v raw Raw setting value
1172 * @v raw_len Length of raw setting value
1173 * @ret value Numeric value
1174 * @ret rc Return status code
1176 int setting_numerate ( const struct setting_type *type, const void *raw,
1177 size_t raw_len, unsigned long *value ) {
1180 if ( ! type->numerate )
1183 return type->numerate ( type, raw, raw_len, value );
1187 * Convert number to setting value
1189 * @v type Setting type
1190 * @v value Numeric value
1191 * @v buf Buffer to contain raw value
1192 * @v len Length of buffer
1193 * @ret len Length of raw value, or negative error
1195 int setting_denumerate ( const struct setting_type *type, unsigned long value,
1196 void *buf, size_t len ) {
1199 if ( ! type->denumerate )
1202 return type->denumerate ( type, value, buf, len );
1206 * Fetch formatted value of setting
1208 * @v settings Settings block, or NULL to search all blocks
1209 * @v setting Setting to fetch
1210 * @v origin Origin of setting to fill in, or NULL
1211 * @v fetched Fetched setting to fill in, or NULL
1212 * @v buf Buffer to contain formatted value
1213 * @v len Length of buffer
1214 * @ret len Length of formatted value, or negative error
1216 int fetchf_setting ( struct settings *settings, const struct setting *setting,
1217 struct settings **origin, struct setting *fetched,
1218 char *buf, size_t len ) {
1219 struct setting tmp_fetched;
1224 /* Use local buffers if necessary */
1226 fetched = &tmp_fetched;
1228 /* Fetch raw value */
1229 raw_len = fetch_setting_copy ( settings, setting, origin, fetched,
1231 if ( raw_len < 0 ) {
1233 goto err_fetch_copy;
1237 assert ( fetched->type != NULL );
1239 /* Format setting */
1240 if ( ( ret = setting_format ( fetched->type, raw, raw_len, buf,
1251 * Fetch copy of formatted value of setting
1253 * @v settings Settings block, or NULL to search all blocks
1254 * @v setting Setting to fetch
1255 * @v origin Origin of setting to fill in, or NULL
1256 * @v fetched Fetched setting to fill in, or NULL
1257 * @v value Buffer to allocate and fill with formatted value
1258 * @ret len Length of formatted value, or negative error
1260 * The caller is responsible for eventually freeing the allocated
1263 int fetchf_setting_copy ( struct settings *settings,
1264 const struct setting *setting,
1265 struct settings **origin, struct setting *fetched,
1267 struct settings *tmp_origin;
1268 struct setting tmp_fetched;
1272 /* Use local buffers if necessary */
1274 origin = &tmp_origin;
1276 fetched = &tmp_fetched;
1278 /* Avoid returning uninitialised data on error */
1281 /* Check existence, and fetch formatted value length */
1282 len = fetchf_setting ( settings, setting, origin, fetched, NULL, 0 );
1286 /* Allocate buffer */
1287 *value = zalloc ( len + 1 /* NUL */ );
1291 /* Fetch formatted value */
1292 check_len = fetchf_setting ( *origin, fetched, NULL, NULL, *value,
1293 ( len + 1 /* NUL */ ) );
1294 assert ( check_len == len );
1299 * Store formatted value of setting
1301 * @v settings Settings block
1302 * @v setting Setting to store
1303 * @v value Formatted setting data, or NULL
1304 * @ret rc Return status code
1306 int storef_setting ( struct settings *settings, const struct setting *setting,
1307 const char *value ) {
1313 /* NULL value or empty string implies deletion */
1314 if ( ( ! value ) || ( ! value[0] ) )
1315 return delete_setting ( settings, setting );
1318 assert ( setting->type != NULL );
1320 /* Get raw value length */
1321 raw_len = setting_parse ( setting->type, value, NULL, 0 );
1322 if ( raw_len < 0 ) {
1327 /* Allocate buffer for raw value */
1328 raw = malloc ( raw_len );
1334 /* Parse formatted value */
1335 check_len = setting_parse ( setting->type, value, raw, raw_len );
1336 assert ( check_len == raw_len );
1338 /* Store raw value */
1339 if ( ( rc = store_setting ( settings, setting, raw, raw_len ) ) != 0 )
1350 * Fetch numeric value of setting
1352 * @v settings Settings block, or NULL to search all blocks
1353 * @v setting Setting to fetch
1354 * @v origin Origin of setting to fill in, or NULL
1355 * @v fetched Fetched setting to fill in, or NULL
1356 * @v value Numeric value to fill in
1357 * @ret rc Return status code
1359 int fetchn_setting ( struct settings *settings, const struct setting *setting,
1360 struct settings **origin, struct setting *fetched,
1361 unsigned long *value ) {
1362 struct setting tmp_fetched;
1367 /* Use local buffers if necessary */
1369 fetched = &tmp_fetched;
1371 /* Fetch raw value */
1372 raw_len = fetch_setting_copy ( settings, setting, origin, fetched,
1374 if ( raw_len < 0 ) {
1376 goto err_fetch_copy;
1380 assert ( fetched->type != NULL );
1382 /* Numerate setting */
1383 if ( ( rc = setting_numerate ( fetched->type, raw, raw_len,
1394 * Store numeric value of setting
1396 * @v settings Settings block
1397 * @v setting Setting
1398 * @v value Numeric value
1399 * @ret rc Return status code
1401 int storen_setting ( struct settings *settings, const struct setting *setting,
1402 unsigned long value ) {
1409 assert ( setting->type != NULL );
1411 /* Get raw value length */
1412 raw_len = setting_denumerate ( setting->type, value, NULL, 0 );
1413 if ( raw_len < 0 ) {
1418 /* Allocate buffer for raw value */
1419 raw = malloc ( raw_len );
1425 /* Denumerate value */
1426 check_len = setting_denumerate ( setting->type, value, raw, raw_len );
1427 assert ( check_len == raw_len );
1429 /* Store raw value */
1430 if ( ( rc = store_setting ( settings, setting, raw, raw_len ) ) != 0 )
1440 /******************************************************************************
1444 ******************************************************************************
1448 * Find predefined setting
1451 * @ret setting Setting, or NULL
1453 struct setting * find_setting ( const char *name ) {
1454 struct setting *setting;
1456 for_each_table_entry ( setting, SETTINGS ) {
1457 if ( strcmp ( name, setting->name ) == 0 )
1464 * Parse setting name as tag number
1467 * @ret tag Tag number, or 0 if not a valid number
1469 static unsigned int parse_setting_tag ( const char *name ) {
1470 char *tmp = ( ( char * ) name );
1471 unsigned int tag = 0;
1474 tag = ( ( tag << 8 ) | strtoul ( tmp, &tmp, 0 ) );
1487 * @ret type Setting type, or NULL
1489 static const struct setting_type * find_setting_type ( const char *name ) {
1490 const struct setting_type *type;
1492 for_each_table_entry ( type, SETTING_TYPES ) {
1493 if ( strcmp ( name, type->name ) == 0 )
1500 * Parse setting name
1502 * @v name Name of setting
1503 * @v get_child Function to find or create child settings block
1504 * @v settings Settings block to fill in
1505 * @v setting Setting to fill in
1506 * @ret rc Return status code
1508 * Interprets a name of the form
1509 * "[settings_name/]tag_name[:type_name]" and fills in the appropriate
1512 * Note that on success, this function will have modified the original
1515 int parse_setting_name ( char *name, get_child_settings_t get_child,
1516 struct settings **settings, struct setting *setting ) {
1517 char *settings_name;
1520 struct setting *predefined;
1524 *settings = &settings_root;
1525 memset ( setting, 0, sizeof ( *setting ) );
1528 /* Split name into "[settings_name/]setting_name[:type_name]" */
1529 if ( ( setting_name = strchr ( name, '/' ) ) != NULL ) {
1530 *(setting_name++) = 0;
1531 settings_name = name;
1533 setting_name = name;
1534 settings_name = NULL;
1536 if ( ( type_name = strchr ( setting_name, ':' ) ) != NULL )
1539 /* Identify settings block, if specified */
1540 if ( settings_name ) {
1541 *settings = parse_settings_name ( settings_name, get_child );
1542 if ( *settings == NULL ) {
1543 DBG ( "Unrecognised settings block \"%s\" in \"%s\"\n",
1544 settings_name, name );
1550 /* Identify setting */
1551 setting->tag = parse_setting_tag ( setting_name );
1552 setting->scope = (*settings)->default_scope;
1553 setting->name = setting_name;
1554 for_each_table_entry ( predefined, SETTINGS ) {
1555 /* Matches a predefined setting; use that setting */
1556 if ( setting_cmp ( predefined, setting ) == 0 ) {
1557 memcpy ( setting, predefined, sizeof ( *setting ) );
1562 /* Identify setting type, if specified */
1564 setting->type = find_setting_type ( type_name );
1565 if ( setting->type == NULL ) {
1566 DBG ( "Invalid setting type \"%s\" in \"%s\"\n",
1576 /* Restore original name */
1577 if ( settings_name )
1578 *( setting_name - 1 ) = '/';
1580 *( type_name - 1 ) = ':';
1585 * Return full setting name
1587 * @v settings Settings block, or NULL
1588 * @v setting Setting
1590 * @v len Length of buffer
1591 * @ret len Length of setting name, or negative error
1593 int setting_name ( struct settings *settings, const struct setting *setting,
1594 char *buf, size_t len ) {
1597 settings = settings_target ( settings );
1598 name = settings_name ( settings );
1599 return snprintf ( buf, len, "%s%s%s:%s", name, ( name[0] ? "/" : "" ),
1600 setting->name, setting->type->name );
1603 /******************************************************************************
1607 ******************************************************************************
1611 * Parse string setting value
1613 * @v type Setting type
1614 * @v value Formatted setting value
1615 * @v buf Buffer to contain raw value
1616 * @v len Length of buffer
1617 * @ret len Length of raw value, or negative error
1619 static int parse_string_setting ( const struct setting_type *type __unused,
1620 const char *value, void *buf, size_t len ) {
1621 size_t raw_len = strlen ( value ); /* Exclude terminating NUL */
1623 /* Copy string to buffer */
1624 if ( len > raw_len )
1626 memcpy ( buf, value, len );
1632 * Format string setting value
1634 * @v type Setting type
1635 * @v raw Raw setting value
1636 * @v raw_len Length of raw setting value
1637 * @v buf Buffer to contain formatted value
1638 * @v len Length of buffer
1639 * @ret len Length of formatted value, or negative error
1641 static int format_string_setting ( const struct setting_type *type __unused,
1642 const void *raw, size_t raw_len, char *buf,
1645 /* Copy string to buffer, and terminate */
1646 memset ( buf, 0, len );
1647 if ( len > raw_len )
1649 memcpy ( buf, raw, len );
1654 /** A string setting type */
1655 const struct setting_type setting_type_string __setting_type = {
1657 .parse = parse_string_setting,
1658 .format = format_string_setting,
1661 /** A URI-encoded string setting type
1663 * This setting type is obsolete; the name ":uristring" is retained to
1664 * avoid breaking existing scripts.
1666 const struct setting_type setting_type_uristring __setting_type = {
1667 .name = "uristring",
1668 .parse = parse_string_setting,
1669 .format = format_string_setting,
1673 * Parse IPv4 address setting value (when IPv4 support is not present)
1675 * @v type Setting type
1676 * @v value Formatted setting value
1677 * @v buf Buffer to contain raw value
1678 * @v len Length of buffer
1679 * @ret len Length of raw value, or negative error
1681 __weak int parse_ipv4_setting ( const struct setting_type *type __unused,
1682 const char *value __unused, void *buf __unused,
1683 size_t len __unused ) {
1688 * Format IPv4 address setting value (when IPv4 support is not present)
1690 * @v type Setting type
1691 * @v raw Raw setting value
1692 * @v raw_len Length of raw setting value
1693 * @v buf Buffer to contain formatted value
1694 * @v len Length of buffer
1695 * @ret len Length of formatted value, or negative error
1697 __weak int format_ipv4_setting ( const struct setting_type *type __unused,
1698 const void *raw __unused,
1699 size_t raw_len __unused, char *buf __unused,
1700 size_t len __unused ) {
1704 /** An IPv4 address setting type */
1705 const struct setting_type setting_type_ipv4 __setting_type = {
1707 .parse = parse_ipv4_setting,
1708 .format = format_ipv4_setting,
1712 * Parse IPv6 address setting value (when IPv6 support is not present)
1714 * @v type Setting type
1715 * @v value Formatted setting value
1716 * @v buf Buffer to contain raw value
1717 * @v len Length of buffer
1718 * @ret len Length of raw value, or negative error
1720 __weak int parse_ipv6_setting ( const struct setting_type *type __unused,
1721 const char *value __unused, void *buf __unused,
1722 size_t len __unused ) {
1727 * Format IPv6 address setting value (when IPv6 support is not present)
1729 * @v type Setting type
1730 * @v raw Raw setting value
1731 * @v raw_len Length of raw setting value
1732 * @v buf Buffer to contain formatted value
1733 * @v len Length of buffer
1734 * @ret len Length of formatted value, or negative error
1736 __weak int format_ipv6_setting ( const struct setting_type *type __unused,
1737 const void *raw __unused,
1738 size_t raw_len __unused, char *buf __unused,
1739 size_t len __unused ) {
1743 /** An IPv6 address setting type */
1744 const struct setting_type setting_type_ipv6 __setting_type = {
1746 .parse = parse_ipv6_setting,
1747 .format = format_ipv6_setting,
1750 /** IPv6 settings scope */
1751 const struct settings_scope ipv6_scope;
1754 * Integer setting type indices
1756 * These indexes are defined such that (1<<index) gives the width of
1757 * the integer, in bytes.
1759 enum setting_type_int_index {
1760 SETTING_TYPE_INT8 = 0,
1761 SETTING_TYPE_INT16 = 1,
1762 SETTING_TYPE_INT32 = 2,
1766 * Integer setting type names
1768 * These names exist as a static array in order to allow the type's
1769 * integer size and signedness to be determined from the type's name.
1770 * Note that there are no separate entries for the signed integer
1771 * types: the name pointers simply point to the second character of
1772 * the relevant string.
1774 static const char setting_type_int_name[][8] = {
1775 [SETTING_TYPE_INT8] = "uint8",
1776 [SETTING_TYPE_INT16] = "uint16",
1777 [SETTING_TYPE_INT32] = "uint32",
1781 * Get unsigned integer setting type name
1783 * @v index Integer setting type index
1784 * @ret name Setting type name
1786 #define SETTING_TYPE_UINT_NAME( index ) setting_type_int_name[index]
1789 * Get signed integer setting type name
1791 * @v index Integer setting type index
1792 * @ret name Setting type name
1794 #define SETTING_TYPE_INT_NAME( index ) ( setting_type_int_name[index] + 1 )
1797 * Get integer setting type index
1799 * @v type Setting type
1800 * @ret index Integer setting type index
1802 static unsigned int setting_type_int_index ( const struct setting_type *type ) {
1804 return ( ( type->name - setting_type_int_name[0] ) /
1805 sizeof ( setting_type_int_name[0] ) );
1809 * Get integer setting type width
1811 * @v type Setting type
1812 * @ret index Integer setting type width
1814 static unsigned int setting_type_int_width ( const struct setting_type *type ) {
1816 return ( 1 << setting_type_int_index ( type ) );
1820 * Get integer setting type signedness
1822 * @v type Setting type
1823 * @ret is_signed Integer setting type is signed
1825 static int setting_type_int_is_signed ( const struct setting_type *type ) {
1826 return ( ( type->name - setting_type_int_name[0] ) & 1 );
1830 * Convert number to setting value
1832 * @v type Setting type
1833 * @v value Numeric value
1834 * @v buf Buffer to contain raw value
1835 * @v len Length of buffer
1836 * @ret len Length of raw value, or negative error
1838 static int denumerate_int_setting ( const struct setting_type *type,
1839 unsigned long value, void *buf,
1841 unsigned int size = setting_type_int_width ( type );
1847 u.num = htonl ( value );
1850 memcpy ( buf, &u.bytes[ sizeof ( u ) - size ], len );
1856 * Convert setting value to number
1858 * @v type Setting type
1859 * @v raw Raw setting value
1860 * @v raw_len Length of raw setting value
1861 * @v value Numeric value to fill in
1862 * @ret rc Return status code
1864 static int numerate_int_setting ( const struct setting_type *type,
1865 const void *raw, size_t raw_len,
1866 unsigned long *value ) {
1867 int is_signed = setting_type_int_is_signed ( type );
1870 /* Extract numeric value */
1871 check_len = numeric_setting_value ( is_signed, raw, raw_len, value );
1872 if ( check_len < 0 )
1874 assert ( check_len == ( int ) raw_len );
1880 * Parse integer setting value
1882 * @v type Setting type
1883 * @v value Formatted setting value
1884 * @v buf Buffer to contain raw value
1885 * @v len Length of buffer
1886 * @ret len Length of raw value, or negative error
1888 static int parse_int_setting ( const struct setting_type *type,
1889 const char *value, void *buf, size_t len ) {
1891 unsigned long num_value;
1894 num_value = strtoul ( value, &endp, 0 );
1898 return type->denumerate ( type, num_value, buf, len );
1902 * Format signed integer setting value
1904 * @v type Setting type
1905 * @v raw Raw setting value
1906 * @v raw_len Length of raw setting value
1907 * @v buf Buffer to contain formatted value
1908 * @v len Length of buffer
1909 * @ret len Length of formatted value, or negative error
1911 static int format_int_setting ( const struct setting_type *type,
1912 const void *raw, size_t raw_len,
1913 char *buf, size_t len ) {
1914 unsigned long value;
1917 /* Extract numeric value */
1918 if ( ( ret = type->numerate ( type, raw, raw_len, &value ) ) < 0 )
1922 return snprintf ( buf, len, "%ld", value );
1926 * Format unsigned integer setting value
1928 * @v type Setting type
1929 * @v raw Raw setting value
1930 * @v raw_len Length of raw setting value
1931 * @v buf Buffer to contain formatted value
1932 * @v len Length of buffer
1933 * @ret len Length of formatted value, or negative error
1935 static int format_uint_setting ( const struct setting_type *type,
1936 const void *raw, size_t raw_len,
1937 char *buf, size_t len ) {
1938 unsigned long value;
1941 /* Extract numeric value */
1942 if ( ( ret = type->numerate ( type, raw, raw_len, &value ) ) < 0 )
1946 return snprintf ( buf, len, "%#lx", value );
1950 * Define a signed integer setting type
1952 * @v index Integer setting type index
1953 * @ret type Setting type
1955 #define SETTING_TYPE_INT( index ) { \
1956 .name = SETTING_TYPE_INT_NAME ( index ), \
1957 .parse = parse_int_setting, \
1958 .format = format_int_setting, \
1959 .denumerate = denumerate_int_setting, \
1960 .numerate = numerate_int_setting, \
1964 * Define an unsigned integer setting type
1966 * @v index Integer setting type index
1967 * @ret type Setting type
1969 #define SETTING_TYPE_UINT( index ) { \
1970 .name = SETTING_TYPE_UINT_NAME ( index ), \
1971 .parse = parse_int_setting, \
1972 .format = format_uint_setting, \
1973 .denumerate = denumerate_int_setting, \
1974 .numerate = numerate_int_setting, \
1977 /** A signed 8-bit integer setting type */
1978 const struct setting_type setting_type_int8 __setting_type =
1979 SETTING_TYPE_INT ( SETTING_TYPE_INT8 );
1981 /** A signed 16-bit integer setting type */
1982 const struct setting_type setting_type_int16 __setting_type =
1983 SETTING_TYPE_INT ( SETTING_TYPE_INT16 );
1985 /** A signed 32-bit integer setting type */
1986 const struct setting_type setting_type_int32 __setting_type =
1987 SETTING_TYPE_INT ( SETTING_TYPE_INT32 );
1989 /** An unsigned 8-bit integer setting type */
1990 const struct setting_type setting_type_uint8 __setting_type =
1991 SETTING_TYPE_UINT ( SETTING_TYPE_INT8 );
1993 /** An unsigned 16-bit integer setting type */
1994 const struct setting_type setting_type_uint16 __setting_type =
1995 SETTING_TYPE_UINT ( SETTING_TYPE_INT16 );
1997 /** An unsigned 32-bit integer setting type */
1998 const struct setting_type setting_type_uint32 __setting_type =
1999 SETTING_TYPE_UINT ( SETTING_TYPE_INT32 );
2002 * Format hex string setting value
2004 * @v delimiter Byte delimiter
2005 * @v raw Raw setting value
2006 * @v raw_len Length of raw setting value
2007 * @v buf Buffer to contain formatted value
2008 * @v len Length of buffer
2009 * @ret len Length of formatted value, or negative error
2011 static int format_hex_setting ( const char *delimiter, const void *raw,
2012 size_t raw_len, char *buf, size_t len ) {
2013 const uint8_t *bytes = raw;
2018 buf[0] = 0; /* Ensure that a terminating NUL exists */
2019 for ( i = 0 ; i < raw_len ; i++ ) {
2020 used += ssnprintf ( ( buf + used ), ( len - used ),
2021 "%s%02x", ( used ? delimiter : "" ),
2028 * Parse hex string setting value (using colon delimiter)
2030 * @v type Setting type
2031 * @v value Formatted setting value
2032 * @v buf Buffer to contain raw value
2033 * @v len Length of buffer
2034 * @v size Integer size, in bytes
2035 * @ret len Length of raw value, or negative error
2037 static int parse_hex_setting ( const struct setting_type *type __unused,
2038 const char *value, void *buf, size_t len ) {
2039 return hex_decode ( value, ':', buf, len );
2043 * Format hex string setting value (using colon delimiter)
2045 * @v type Setting type
2046 * @v raw Raw setting value
2047 * @v raw_len Length of raw setting value
2048 * @v buf Buffer to contain formatted value
2049 * @v len Length of buffer
2050 * @ret len Length of formatted value, or negative error
2052 static int format_hex_colon_setting ( const struct setting_type *type __unused,
2053 const void *raw, size_t raw_len,
2054 char *buf, size_t len ) {
2055 return format_hex_setting ( ":", raw, raw_len, buf, len );
2059 * Parse hex string setting value (using hyphen delimiter)
2061 * @v type Setting type
2062 * @v value Formatted setting value
2063 * @v buf Buffer to contain raw value
2064 * @v len Length of buffer
2065 * @v size Integer size, in bytes
2066 * @ret len Length of raw value, or negative error
2068 static int parse_hex_hyphen_setting ( const struct setting_type *type __unused,
2069 const char *value, void *buf,
2071 return hex_decode ( value, '-', buf, len );
2075 * Format hex string setting value (using hyphen delimiter)
2077 * @v type Setting type
2078 * @v raw Raw setting value
2079 * @v raw_len Length of raw setting value
2080 * @v buf Buffer to contain formatted value
2081 * @v len Length of buffer
2082 * @ret len Length of formatted value, or negative error
2084 static int format_hex_hyphen_setting ( const struct setting_type *type __unused,
2085 const void *raw, size_t raw_len,
2086 char *buf, size_t len ) {
2087 return format_hex_setting ( "-", raw, raw_len, buf, len );
2091 * Parse hex string setting value (using no delimiter)
2093 * @v type Setting type
2094 * @v value Formatted setting value
2095 * @v buf Buffer to contain raw value
2096 * @v len Length of buffer
2097 * @v size Integer size, in bytes
2098 * @ret len Length of raw value, or negative error
2100 static int parse_hex_raw_setting ( const struct setting_type *type __unused,
2101 const char *value, void *buf, size_t len ) {
2102 return hex_decode ( value, 0, buf, len );
2106 * Format hex string setting value (using no delimiter)
2108 * @v type Setting type
2109 * @v raw Raw setting value
2110 * @v raw_len Length of raw setting value
2111 * @v buf Buffer to contain formatted value
2112 * @v len Length of buffer
2113 * @ret len Length of formatted value, or negative error
2115 static int format_hex_raw_setting ( const struct setting_type *type __unused,
2116 const void *raw, size_t raw_len,
2117 char *buf, size_t len ) {
2118 return format_hex_setting ( "", raw, raw_len, buf, len );
2121 /** A hex-string setting (colon-delimited) */
2122 const struct setting_type setting_type_hex __setting_type = {
2124 .parse = parse_hex_setting,
2125 .format = format_hex_colon_setting,
2128 /** A hex-string setting (hyphen-delimited) */
2129 const struct setting_type setting_type_hexhyp __setting_type = {
2131 .parse = parse_hex_hyphen_setting,
2132 .format = format_hex_hyphen_setting,
2135 /** A hex-string setting (non-delimited) */
2136 const struct setting_type setting_type_hexraw __setting_type = {
2138 .parse = parse_hex_raw_setting,
2139 .format = format_hex_raw_setting,
2143 * Format UUID setting value
2145 * @v type Setting type
2146 * @v raw Raw setting value
2147 * @v raw_len Length of raw setting value
2148 * @v buf Buffer to contain formatted value
2149 * @v len Length of buffer
2150 * @ret len Length of formatted value, or negative error
2152 static int format_uuid_setting ( const struct setting_type *type __unused,
2153 const void *raw, size_t raw_len, char *buf,
2155 const union uuid *uuid = raw;
2158 if ( raw_len != sizeof ( *uuid ) )
2162 return snprintf ( buf, len, "%s", uuid_ntoa ( uuid ) );
2165 /** UUID setting type */
2166 const struct setting_type setting_type_uuid __setting_type = {
2168 .format = format_uuid_setting,
2172 * Format PCI bus:dev.fn setting value
2174 * @v type Setting type
2175 * @v raw Raw setting value
2176 * @v raw_len Length of raw setting value
2177 * @v buf Buffer to contain formatted value
2178 * @v len Length of buffer
2179 * @ret len Length of formatted value, or negative error
2181 static int format_busdevfn_setting ( const struct setting_type *type __unused,
2182 const void *raw, size_t raw_len, char *buf,
2184 unsigned long busdevfn;
2187 /* Extract numeric value */
2188 check_len = numeric_setting_value ( 0, raw, raw_len, &busdevfn );
2189 if ( check_len < 0 )
2191 assert ( check_len == ( int ) raw_len );
2194 return snprintf ( buf, len, "%02lx:%02lx.%lx", PCI_BUS ( busdevfn ),
2195 PCI_SLOT ( busdevfn ), PCI_FUNC ( busdevfn ) );
2198 /** PCI bus:dev.fn setting type */
2199 const struct setting_type setting_type_busdevfn __setting_type = {
2201 .format = format_busdevfn_setting,
2204 /******************************************************************************
2208 ******************************************************************************
2212 * Expand variables within string
2215 * @ret expstr Expanded string
2217 * The expanded string is allocated with malloc() and the caller must
2218 * eventually free() it.
2220 char * expand_settings ( const char *string ) {
2221 struct settings *settings;
2222 struct setting setting;
2234 /* Obtain temporary modifiable copy of string */
2235 expstr = strdup ( string );
2239 /* Expand while expansions remain */
2244 /* Locate setting to be expanded */
2247 for ( tmp = expstr ; *tmp ; tmp++ ) {
2248 if ( ( tmp[0] == '$' ) && ( tmp[1] == '{' ) )
2250 if ( start && ( tmp[0] == '}' ) ) {
2258 name = ( start + 2 );
2262 /* Expand setting */
2263 if ( ( rc = parse_setting_name ( name, find_child_settings,
2265 &setting ) ) != 0 ) {
2266 /* Treat invalid setting names as empty */
2269 /* Fetch and format setting value. Ignore
2270 * errors; treat non-existent settings as empty.
2272 fetchf_setting_copy ( settings, &setting, NULL, NULL,
2276 /* Construct expanded string and discard old string */
2278 new_len = asprintf ( &expstr, "%s%s%s",
2279 head, ( value ? value : "" ), tail );
2289 /******************************************************************************
2293 ******************************************************************************
2296 /** Hostname setting */
2297 const struct setting hostname_setting __setting ( SETTING_HOST, hostname ) = {
2299 .description = "Host name",
2300 .tag = DHCP_HOST_NAME,
2301 .type = &setting_type_string,
2304 /** Domain name setting */
2305 const struct setting domain_setting __setting ( SETTING_IP_EXTRA, domain ) = {
2307 .description = "DNS domain",
2308 .tag = DHCP_DOMAIN_NAME,
2309 .type = &setting_type_string,
2312 /** TFTP server setting */
2313 const struct setting next_server_setting __setting ( SETTING_BOOT,next-server)={
2314 .name = "next-server",
2315 .description = "TFTP server",
2316 .tag = DHCP_EB_SIADDR,
2317 .type = &setting_type_ipv4,
2320 /** Filename setting */
2321 const struct setting filename_setting __setting ( SETTING_BOOT, filename ) = {
2323 .description = "Boot filename",
2324 .tag = DHCP_BOOTFILE_NAME,
2325 .type = &setting_type_string,
2328 /** Root path setting */
2329 const struct setting root_path_setting __setting ( SETTING_SANBOOT, root-path)={
2330 .name = "root-path",
2331 .description = "SAN root path",
2332 .tag = DHCP_ROOT_PATH,
2333 .type = &setting_type_string,
2336 /** Username setting */
2337 const struct setting username_setting __setting ( SETTING_AUTH, username ) = {
2339 .description = "User name",
2340 .tag = DHCP_EB_USERNAME,
2341 .type = &setting_type_string,
2344 /** Password setting */
2345 const struct setting password_setting __setting ( SETTING_AUTH, password ) = {
2347 .description = "Password",
2348 .tag = DHCP_EB_PASSWORD,
2349 .type = &setting_type_string,
2352 /** Priority setting */
2353 const struct setting priority_setting __setting ( SETTING_MISC, priority ) = {
2355 .description = "Settings priority",
2356 .tag = DHCP_EB_PRIORITY,
2357 .type = &setting_type_int8,
2360 /** DHCP user class setting */
2361 const struct setting user_class_setting __setting ( SETTING_HOST_EXTRA,
2363 .name = "user-class",
2364 .description = "DHCP user class",
2365 .tag = DHCP_USER_CLASS_ID,
2366 .type = &setting_type_string,
2369 /******************************************************************************
2371 * Built-in settings block
2373 ******************************************************************************
2376 /** Built-in setting scope */
2377 const struct settings_scope builtin_scope;
2380 * Fetch error number setting
2382 * @v data Buffer to fill with setting data
2383 * @v len Length of buffer
2384 * @ret len Length of setting data, or negative error
2386 static int errno_fetch ( void *data, size_t len ) {
2389 /* Return current error */
2390 content = htonl ( errno );
2391 if ( len > sizeof ( content ) )
2392 len = sizeof ( content );
2393 memcpy ( data, &content, len );
2394 return sizeof ( content );
2397 /** Error number setting */
2398 const struct setting errno_setting __setting ( SETTING_MISC, errno ) = {
2400 .description = "Last error",
2401 .type = &setting_type_uint32,
2402 .scope = &builtin_scope,
2405 /** Error number built-in setting */
2406 struct builtin_setting errno_builtin_setting __builtin_setting = {
2407 .setting = &errno_setting,
2408 .fetch = errno_fetch,
2412 * Fetch build architecture setting
2414 * @v data Buffer to fill with setting data
2415 * @v len Length of buffer
2416 * @ret len Length of setting data, or negative error
2418 static int buildarch_fetch ( void *data, size_t len ) {
2419 static const char buildarch[] = _S2 ( ARCH );
2421 strncpy ( data, buildarch, len );
2422 return ( sizeof ( buildarch ) - 1 /* NUL */ );
2425 /** Build architecture setting */
2426 const struct setting buildarch_setting __setting ( SETTING_MISC, buildarch ) = {
2427 .name = "buildarch",
2428 .description = "Build architecture",
2429 .type = &setting_type_string,
2430 .scope = &builtin_scope,
2433 /** Build architecture built-in setting */
2434 struct builtin_setting buildarch_builtin_setting __builtin_setting = {
2435 .setting = &buildarch_setting,
2436 .fetch = buildarch_fetch,
2440 * Fetch platform setting
2442 * @v data Buffer to fill with setting data
2443 * @v len Length of buffer
2444 * @ret len Length of setting data, or negative error
2446 static int platform_fetch ( void *data, size_t len ) {
2447 static const char platform[] = _S2 ( PLATFORM );
2449 strncpy ( data, platform, len );
2450 return ( sizeof ( platform ) - 1 /* NUL */ );
2453 /** Platform setting */
2454 const struct setting platform_setting __setting ( SETTING_MISC, platform ) = {
2456 .description = "Platform",
2457 .type = &setting_type_string,
2458 .scope = &builtin_scope,
2461 /** Platform built-in setting */
2462 struct builtin_setting platform_builtin_setting __builtin_setting = {
2463 .setting = &platform_setting,
2464 .fetch = platform_fetch,
2468 * Fetch version setting
2470 * @v data Buffer to fill with setting data
2471 * @v len Length of buffer
2472 * @ret len Length of setting data, or negative error
2474 static int version_fetch ( void *data, size_t len ) {
2475 strncpy ( data, product_version, len );
2476 return ( strlen ( product_version ) );
2479 /** Version setting */
2480 const struct setting version_setting __setting ( SETTING_MISC, version ) = {
2482 .description = "Version",
2483 .type = &setting_type_string,
2484 .scope = &builtin_scope,
2487 /** Version built-in setting */
2488 struct builtin_setting version_builtin_setting __builtin_setting = {
2489 .setting = &version_setting,
2490 .fetch = version_fetch,
2494 * Fetch built-in setting
2496 * @v settings Settings block
2497 * @v setting Setting to fetch
2498 * @v data Buffer to fill with setting data
2499 * @v len Length of buffer
2500 * @ret len Length of setting data, or negative error
2502 static int builtin_fetch ( struct settings *settings __unused,
2503 struct setting *setting,
2504 void *data, size_t len ) {
2505 struct builtin_setting *builtin;
2507 for_each_table_entry ( builtin, BUILTIN_SETTINGS ) {
2508 if ( setting_cmp ( setting, builtin->setting ) == 0 )
2509 return builtin->fetch ( data, len );
2515 * Check applicability of built-in setting
2517 * @v settings Settings block
2518 * @v setting Setting
2519 * @ret applies Setting applies within this settings block
2521 static int builtin_applies ( struct settings *settings __unused,
2522 const struct setting *setting ) {
2524 return ( setting->scope == &builtin_scope );
2527 /** Built-in settings operations */
2528 static struct settings_operations builtin_settings_operations = {
2529 .applies = builtin_applies,
2530 .fetch = builtin_fetch,
2533 /** Built-in settings */
2534 static struct settings builtin_settings = {
2536 .siblings = LIST_HEAD_INIT ( builtin_settings.siblings ),
2537 .children = LIST_HEAD_INIT ( builtin_settings.children ),
2538 .op = &builtin_settings_operations,
2541 /** Initialise built-in settings */
2542 static void builtin_init ( void ) {
2545 if ( ( rc = register_settings ( &builtin_settings, NULL,
2546 "builtin" ) ) != 0 ) {
2547 DBG ( "Could not register built-in settings: %s\n",
2553 /** Built-in settings initialiser */
2554 struct init_fn builtin_init_fn __init_fn ( INIT_NORMAL ) = {
2555 .initialise = builtin_init,