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Better allocation code for DS digest cache.

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This commit is contained in:
Simon Kelley
2024-01-06 20:51:13 +00:00
parent 3c91bca943
commit 39de57499e
1 changed files with 30 additions and 8 deletions
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36
src/dnssec.c
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@@ -724,7 +724,8 @@ int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t plen, ch
union all_addr a;
int failflags = DNSSEC_FAIL_NODSSUP | DNSSEC_FAIL_NOZONE;
char valid_digest[255];
static unsigned char *cached_digest[255];
static unsigned char **cached_digest;
static size_t cached_digest_size = 0;
if (ntohs(header->qdcount) != 1 || RCODE(header) != NOERROR || !extract_name(header, plen, &p, name, 1, 4))
return STAT_BOGUS | DNSSEC_FAIL_NOKEY;
@@ -840,13 +841,34 @@ int dnssec_validate_by_ds(time_t now, struct dns_header *header, size_t plen, ch
from_wire(name);
if (!cached_digest[recp1->addr.ds.digest])
cached_digest[recp1->addr.ds.digest] = whine_malloc(recp1->addr.ds.keylen);
if (cached_digest[recp1->addr.ds.digest])
if (recp1->addr.ds.digest >= cached_digest_size)
{
memcpy(cached_digest[recp1->addr.ds.digest], digest, recp1->addr.ds.keylen);
valid_digest[recp1->addr.ds.digest] = 1;
unsigned char **new;
/* whine_malloc zeros memory */
if ((new = whine_malloc((recp1->addr.ds.digest + 5) * sizeof(unsigned char *))))
{
if (cached_digest_size != 0)
{
memcpy(new, cached_digest, cached_digest_size * sizeof(unsigned char *));
free(cached_digest);
}
cached_digest_size = recp1->addr.ds.digest + 5;
cached_digest = new;
}
}
if (recp1->addr.ds.digest < cached_digest_size)
{
if (!cached_digest[recp1->addr.ds.digest])
cached_digest[recp1->addr.ds.digest] = whine_malloc(recp1->addr.ds.keylen);
if (cached_digest[recp1->addr.ds.digest])
{
memcpy(cached_digest[recp1->addr.ds.digest], digest, recp1->addr.ds.keylen);
valid_digest[recp1->addr.ds.digest] = 1;
}
}
}