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Lazily initialize dns_compress->table only when compression is enabled (#41189)

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This commit is contained in:
Mukund Sivaraman
2015-12-07 12:48:57 +05:30
parent 5b13a593fe
commit 27bc16fcdc
3 changed files with 44 additions and 21 deletions
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58
lib/dns/compress.c
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@@ -36,25 +36,31 @@
#define DCTX_MAGIC ISC_MAGIC('D', 'C', 'T', 'X')
#define VALID_DCTX(x) ISC_MAGIC_VALID(x, DCTX_MAGIC)
#define TABLE_READY \
do { \
unsigned int i; \
\
if ((cctx->allowed & DNS_COMPRESS_READY) == 0) { \
cctx->allowed |= DNS_COMPRESS_READY; \
for (i = 0; i < DNS_COMPRESS_TABLESIZE; i++) \
cctx->table[i] = NULL; \
} \
} while (0)
/***
*** Compression
***/
isc_result_t
dns_compress_init(dns_compress_t *cctx, int edns, isc_mem_t *mctx) {
unsigned int i;
REQUIRE(cctx != NULL);
REQUIRE(mctx != NULL); /* See: rdataset.c:towiresorted(). */
cctx->allowed = 0;
cctx->edns = edns;
for (i = 0; i < DNS_COMPRESS_TABLESIZE; i++)
cctx->table[i] = NULL;
cctx->mctx = mctx;
cctx->count = 0;
cctx->allowed = DNS_COMPRESS_ENABLED;
cctx->magic = CCTX_MAGIC;
cctx->enabled = ISC_TRUE;
return (ISC_R_SUCCESS);
}
@@ -65,19 +71,21 @@ dns_compress_invalidate(dns_compress_t *cctx) {
REQUIRE(VALID_CCTX(cctx));
cctx->magic = 0;
for (i = 0; i < DNS_COMPRESS_TABLESIZE; i++) {
while (cctx->table[i] != NULL) {
node = cctx->table[i];
cctx->table[i] = cctx->table[i]->next;
if ((node->offset & 0x8000) != 0)
isc_mem_put(cctx->mctx, node->r.base,
node->r.length);
if (node->count < DNS_COMPRESS_INITIALNODES)
continue;
isc_mem_put(cctx->mctx, node, sizeof(*node));
if ((cctx->allowed & DNS_COMPRESS_READY) != 0) {
for (i = 0; i < DNS_COMPRESS_TABLESIZE; i++) {
while (cctx->table[i] != NULL) {
node = cctx->table[i];
cctx->table[i] = cctx->table[i]->next;
if ((node->offset & 0x8000) != 0)
isc_mem_put(cctx->mctx, node->r.base,
node->r.length);
if (node->count < DNS_COMPRESS_INITIALNODES)
continue;
isc_mem_put(cctx->mctx, node, sizeof(*node));
}
}
}
cctx->magic = 0;
cctx->allowed = 0;
cctx->edns = -1;
}
@@ -99,7 +107,7 @@ dns_compress_getmethods(dns_compress_t *cctx) {
void
dns_compress_disable(dns_compress_t *cctx) {
REQUIRE(VALID_CCTX(cctx));
cctx->enabled = ISC_FALSE;
cctx->allowed &= ~DNS_COMPRESS_ENABLED;
}
void
@@ -150,9 +158,11 @@ dns_compress_findglobal(dns_compress_t *cctx, const dns_name_t *name,
REQUIRE(dns_name_isabsolute(name) == ISC_TRUE);
REQUIRE(offset != NULL);
if (cctx->enabled == ISC_FALSE)
if ((cctx->allowed & DNS_COMPRESS_ENABLED) == 0)
return (ISC_FALSE);
TABLE_READY;
if (cctx->count == 0)
return (ISC_FALSE);
@@ -222,9 +232,11 @@ dns_compress_add(dns_compress_t *cctx, const dns_name_t *name,
REQUIRE(VALID_CCTX(cctx));
REQUIRE(dns_name_isabsolute(name));
if (cctx->enabled == ISC_FALSE)
if ((cctx->allowed & DNS_COMPRESS_ENABLED) == 0)
return;
TABLE_READY;
if (offset >= 0x4000)
return;
dns_name_init(&tname, NULL);
@@ -296,6 +308,12 @@ dns_compress_rollback(dns_compress_t *cctx, isc_uint16_t offset) {
REQUIRE(VALID_CCTX(cctx));
if ((cctx->allowed & DNS_COMPRESS_ENABLED) == 0)
return;
if ((cctx->allowed & DNS_COMPRESS_READY) == 0)
return;
for (i = 0; i < DNS_COMPRESS_TABLESIZE; i++) {
node = cctx->table[i];
/*