File: val_kcache.c

package info (click to toggle)
unbound 1.6.0-2~bpo8+1
  • links: PTS, VCS
  • area: main
  • in suites: jessie-backports
  • size: 20,444 kB
  • sloc: ansic: 79,862; sh: 5,040; yacc: 1,900; makefile: 1,315; python: 1,302; perl: 141
file content (172 lines) | stat: -rw-r--r-- 5,298 bytes parent folder | download | duplicates (5)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
/*
 * validator/val_kcache.c - validator key shared cache with validated keys
 *
 * Copyright (c) 2007, NLnet Labs. All rights reserved.
 *
 * This software is open source.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * 
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * 
 * Neither the name of the NLNET LABS nor the names of its contributors may
 * be used to endorse or promote products derived from this software without
 * specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/**
 * \file
 *
 * This file contains functions for dealing with the validator key cache.
 */
#include "config.h"
#include "validator/val_kcache.h"
#include "validator/val_kentry.h"
#include "util/log.h"
#include "util/config_file.h"
#include "util/data/dname.h"
#include "util/module.h"

struct key_cache* 
key_cache_create(struct config_file* cfg)
{
	struct key_cache* kcache = (struct key_cache*)calloc(1, 
		sizeof(*kcache));
	size_t numtables, start_size, maxmem;
	if(!kcache) {
		log_err("malloc failure");
		return NULL;
	}
	numtables = cfg->key_cache_slabs;
	start_size = HASH_DEFAULT_STARTARRAY;
	maxmem = cfg->key_cache_size;
	kcache->slab = slabhash_create(numtables, start_size, maxmem,
		&key_entry_sizefunc, &key_entry_compfunc,
		&key_entry_delkeyfunc, &key_entry_deldatafunc, NULL);
	if(!kcache->slab) {
		log_err("malloc failure");
		free(kcache);
		return NULL;
	}
	return kcache;
}

void 
key_cache_delete(struct key_cache* kcache)
{
	if(!kcache)
		return;
	slabhash_delete(kcache->slab);
	free(kcache);
}

void 
key_cache_insert(struct key_cache* kcache, struct key_entry_key* kkey,
	struct module_qstate* qstate)
{
	struct key_entry_key* k = key_entry_copy(kkey);
	if(!k)
		return;
	if(key_entry_isbad(k) && qstate->errinf &&
		qstate->env->cfg->val_log_level >= 2) {
		/* on malloc failure there is simply no reason string */
		key_entry_set_reason(k, errinf_to_str(qstate));
	}
	key_entry_hash(k);
	slabhash_insert(kcache->slab, k->entry.hash, &k->entry, 
		k->entry.data, NULL);
}

/**
 * Lookup exactly in the key cache. Returns pointer to locked entry.
 * Caller must unlock it after use.
 * @param kcache: the key cache.
 * @param name: for what name to look; uncompressed wireformat
 * @param namelen: length of the name.
 * @param key_class: class of the key.
 * @param wr: set true to get a writelock.
 * @return key entry, locked, or NULL if not found. No TTL checking is
 * 	performed.
 */
static struct key_entry_key*
key_cache_search(struct key_cache* kcache, uint8_t* name, size_t namelen, 
	uint16_t key_class, int wr)
{
	struct lruhash_entry* e;
	struct key_entry_key lookfor;
	lookfor.entry.key = &lookfor;
	lookfor.name = name;
	lookfor.namelen = namelen;
	lookfor.key_class = key_class;
	key_entry_hash(&lookfor);
	e = slabhash_lookup(kcache->slab, lookfor.entry.hash, &lookfor, wr);
	if(!e) 
		return NULL;
	return (struct key_entry_key*)e->key;
}

struct key_entry_key* 
key_cache_obtain(struct key_cache* kcache, uint8_t* name, size_t namelen, 
	uint16_t key_class, struct regional* region, time_t now)
{
	/* keep looking until we find a nonexpired entry */
	while(1) {
		struct key_entry_key* k = key_cache_search(kcache, name, 
			namelen, key_class, 0);
		if(k) {
			/* see if TTL is OK */
			struct key_entry_data* d = (struct key_entry_data*)
				k->entry.data;
			if(now <= d->ttl) {
				/* copy and return it */
				struct key_entry_key* retkey =
					key_entry_copy_toregion(k, region);
				lock_rw_unlock(&k->entry.lock);
				return retkey;
			}
			lock_rw_unlock(&k->entry.lock);
		}
		/* snip off first label to continue */
		if(dname_is_root(name))
			break;
		dname_remove_label(&name, &namelen);
	}
	return NULL;
}

size_t 
key_cache_get_mem(struct key_cache* kcache)
{
	return sizeof(*kcache) + slabhash_get_mem(kcache->slab);
}

void key_cache_remove(struct key_cache* kcache,
	uint8_t* name, size_t namelen, uint16_t key_class)
{
	struct key_entry_key lookfor;
	lookfor.entry.key = &lookfor;
	lookfor.name = name;
	lookfor.namelen = namelen;
	lookfor.key_class = key_class;
	key_entry_hash(&lookfor);
	slabhash_remove(kcache->slab, lookfor.entry.hash, &lookfor);
}