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-rw-r--r--list.h196
1 files changed, 0 insertions, 196 deletions
diff --git a/list.h b/list.h
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--- a/list.h
+++ /dev/null
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-/*
- * OpenVPN -- An application to securely tunnel IP networks
- * over a single TCP/UDP port, with support for SSL/TLS-based
- * session authentication and key exchange,
- * packet encryption, packet authentication, and
- * packet compression.
- *
- * Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2
- * as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program (see the file COPYING included with this
- * distribution); if not, write to the Free Software Foundation, Inc.,
- * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-#ifndef LIST_H
-#define LIST_H
-
-/*
- * This code is a fairly straightforward hash
- * table implementation using Bob Jenkins'
- * hash function.
- *
- * Hash tables are used in OpenVPN to keep track of
- * client instances over various key spaces.
- */
-
-#if P2MP_SERVER
-
-/* define this to enable special list test mode */
-/*#define LIST_TEST*/
-
-#include "basic.h"
-#include "buffer.h"
-
-#define hashsize(n) ((uint32_t)1<<(n))
-#define hashmask(n) (hashsize(n)-1)
-
-struct hash_element
-{
- void *value;
- const void *key;
- unsigned int hash_value;
- struct hash_element *next;
-};
-
-struct hash_bucket
-{
- struct hash_element *list;
-};
-
-struct hash
-{
- int n_buckets;
- int n_elements;
- int mask;
- uint32_t iv;
- uint32_t (*hash_function)(const void *key, uint32_t iv);
- bool (*compare_function)(const void *key1, const void *key2); /* return true if equal */
- struct hash_bucket *buckets;
-};
-
-struct hash *hash_init (const int n_buckets,
- const uint32_t iv,
- uint32_t (*hash_function)(const void *key, uint32_t iv),
- bool (*compare_function)(const void *key1, const void *key2));
-
-void hash_free (struct hash *hash);
-
-bool hash_add (struct hash *hash, const void *key, void *value, bool replace);
-
-struct hash_element *hash_lookup_fast (struct hash *hash,
- struct hash_bucket *bucket,
- const void *key,
- uint32_t hv);
-
-bool hash_remove_fast (struct hash *hash,
- struct hash_bucket *bucket,
- const void *key,
- uint32_t hv);
-
-void hash_remove_by_value (struct hash *hash, void *value);
-
-struct hash_iterator
-{
- struct hash *hash;
- int bucket_index;
- struct hash_bucket *bucket;
- struct hash_element *elem;
- struct hash_element *last;
- bool bucket_marked;
- int bucket_index_start;
- int bucket_index_end;
-};
-
-void hash_iterator_init_range (struct hash *hash,
- struct hash_iterator *hi,
- int start_bucket,
- int end_bucket);
-
-void hash_iterator_init (struct hash *hash, struct hash_iterator *iter);
-struct hash_element *hash_iterator_next (struct hash_iterator *hi);
-void hash_iterator_delete_element (struct hash_iterator *hi);
-void hash_iterator_free (struct hash_iterator *hi);
-
-uint32_t hash_func (const uint8_t *k, uint32_t length, uint32_t initval);
-
-uint32_t void_ptr_hash_function (const void *key, uint32_t iv);
-bool void_ptr_compare_function (const void *key1, const void *key2);
-
-#ifdef LIST_TEST
-void list_test (void);
-#endif
-
-static inline uint32_t
-hash_value (const struct hash *hash, const void *key)
-{
- return (*hash->hash_function)(key, hash->iv);
-}
-
-static inline int
-hash_n_elements (const struct hash *hash)
-{
- return hash->n_elements;
-}
-
-static inline int
-hash_n_buckets (const struct hash *hash)
-{
- return hash->n_buckets;
-}
-
-static inline struct hash_bucket *
-hash_bucket (struct hash *hash, uint32_t hv)
-{
- return &hash->buckets[hv & hash->mask];
-}
-
-static inline void *
-hash_lookup (struct hash *hash, const void *key)
-{
- void *ret = NULL;
- struct hash_element *he;
- uint32_t hv = hash_value (hash, key);
- struct hash_bucket *bucket = &hash->buckets[hv & hash->mask];
-
- he = hash_lookup_fast (hash, bucket, key, hv);
- if (he)
- ret = he->value;
-
- return ret;
-}
-
-/* NOTE: assumes that key is not a duplicate */
-static inline void
-hash_add_fast (struct hash *hash,
- struct hash_bucket *bucket,
- const void *key,
- uint32_t hv,
- void *value)
-{
- struct hash_element *he;
-
- ALLOC_OBJ (he, struct hash_element);
- he->value = value;
- he->key = key;
- he->hash_value = hv;
- he->next = bucket->list;
- bucket->list = he;
- ++hash->n_elements;
-}
-
-static inline bool
-hash_remove (struct hash *hash, const void *key)
-{
- uint32_t hv;
- struct hash_bucket *bucket;
- bool ret;
-
- hv = hash_value (hash, key);
- bucket = &hash->buckets[hv & hash->mask];
- ret = hash_remove_fast (hash, bucket, key, hv);
- return ret;
-}
-
-#endif /* P2MP_SERVER */
-#endif /* LIST */