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/* dnsmasq is Copyright (c) 2000-2021 Simon Kelley
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 dated June, 1991, or
(at your option) version 3 dated 29 June, 2007.
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. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dnsmasq.h"
static struct blockdata *keyblock_free;
static unsigned int blockdata_count, blockdata_hwm, blockdata_alloced;
static void blockdata_expand(int n)
{
struct blockdata *new = whine_malloc(n * sizeof(struct blockdata));
if (new)
{
int i;
new[n-1].next = keyblock_free;
keyblock_free = new;
for (i = 0; i < n - 1; i++)
new[i].next = &new[i+1];
blockdata_alloced += n;
}
}
/* Preallocate some blocks, proportional to cachesize, to reduce heap fragmentation. */
void blockdata_init(void)
{
keyblock_free = NULL;
blockdata_alloced = 0;
blockdata_count = 0;
blockdata_hwm = 0;
/* Note that daemon->cachesize is enforced to have non-zero size if OPT_DNSSEC_VALID is set */
if (option_bool(OPT_DNSSEC_VALID))
blockdata_expand(daemon->cachesize);
}
void blockdata_report(void)
{
my_syslog(LOG_INFO, _("pool memory in use %u, max %u, allocated %u"),
blockdata_count * sizeof(struct blockdata),
blockdata_hwm * sizeof(struct blockdata),
blockdata_alloced * sizeof(struct blockdata));
}
static struct blockdata *blockdata_alloc_real(int fd, char *data, size_t len)
{
struct blockdata *block, *ret = NULL;
struct blockdata **prev = &ret;
size_t blen;
while (len > 0)
{
if (!keyblock_free)
blockdata_expand(50);
if (keyblock_free)
{
block = keyblock_free;
keyblock_free = block->next;
blockdata_count++;
}
else
{
/* failed to alloc, free partial chain */
blockdata_free(ret);
return NULL;
}
if (blockdata_hwm < blockdata_count)
blockdata_hwm = blockdata_count;
blen = len > KEYBLOCK_LEN ? KEYBLOCK_LEN : len;
if (data)
{
memcpy(block->key, data, blen);
data += blen;
}
else if (!read_write(fd, block->key, blen, 1))
{
/* failed read free partial chain */
blockdata_free(ret);
return NULL;
}
len -= blen;
*prev = block;
prev = &block->next;
block->next = NULL;
}
return ret;
}
struct blockdata *blockdata_alloc(char *data, size_t len)
{
return blockdata_alloc_real(0, data, len);
}
void blockdata_free(struct blockdata *blocks)
{
struct blockdata *tmp;
if (blocks)
{
for (tmp = blocks; tmp->next; tmp = tmp->next)
blockdata_count--;
tmp->next = keyblock_free;
keyblock_free = blocks;
blockdata_count--;
}
}
/* if data == NULL, return pointer to static block of sufficient size */
void *blockdata_retrieve(struct blockdata *block, size_t len, void *data)
{
size_t blen;
struct blockdata *b;
void *new, *d;
static unsigned int buff_len = 0;
static unsigned char *buff = NULL;
if (!data)
{
if (len > buff_len)
{
if (!(new = whine_malloc(len)))
return NULL;
if (buff)
free(buff);
buff = new;
}
data = buff;
}
for (d = data, b = block; len > 0 && b; b = b->next)
{
blen = len > KEYBLOCK_LEN ? KEYBLOCK_LEN : len;
memcpy(d, b->key, blen);
d += blen;
len -= blen;
}
return data;
}
void blockdata_write(struct blockdata *block, size_t len, int fd)
{
for (; len > 0 && block; block = block->next)
{
size_t blen = len > KEYBLOCK_LEN ? KEYBLOCK_LEN : len;
read_write(fd, block->key, blen, 0);
len -= blen;
}
}
struct blockdata *blockdata_read(int fd, size_t len)
{
return blockdata_alloc_real(fd, NULL, len);
}
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