summaryrefslogtreecommitdiff
path: root/src/resolve/resolved-dns-cache.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/resolve/resolved-dns-cache.c')
-rw-r--r--src/resolve/resolved-dns-cache.c512
1 files changed, 353 insertions, 159 deletions
diff --git a/src/resolve/resolved-dns-cache.c b/src/resolve/resolved-dns-cache.c
index bcb9994a8c..f50d780ebb 100644
--- a/src/resolve/resolved-dns-cache.c
+++ b/src/resolve/resolved-dns-cache.c
@@ -21,15 +21,16 @@
#include "alloc-util.h"
#include "dns-domain.h"
+#include "resolved-dns-answer.h"
#include "resolved-dns-cache.h"
#include "resolved-dns-packet.h"
#include "string-util.h"
-/* Never cache more than 1K entries */
-#define CACHE_MAX 1024
+/* Never cache more than 4K entries */
+#define CACHE_MAX 4096
-/* We never keep any item longer than 10min in our cache */
-#define CACHE_TTL_MAX_USEC (10 * USEC_PER_MINUTE)
+/* We never keep any item longer than 2h in our cache */
+#define CACHE_TTL_MAX_USEC (2 * USEC_PER_HOUR)
typedef enum DnsCacheItemType DnsCacheItemType;
typedef struct DnsCacheItem DnsCacheItem;
@@ -41,14 +42,18 @@ enum DnsCacheItemType {
};
struct DnsCacheItem {
+ DnsCacheItemType type;
DnsResourceKey *key;
DnsResourceRecord *rr;
+
usec_t until;
- DnsCacheItemType type;
- unsigned prioq_idx;
- bool authenticated;
+ bool authenticated:1;
+ bool shared_owner:1;
+
int owner_family;
union in_addr_union owner_address;
+
+ unsigned prioq_idx;
LIST_FIELDS(DnsCacheItem, by_key);
};
@@ -63,7 +68,7 @@ static void dns_cache_item_free(DnsCacheItem *i) {
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsCacheItem*, dns_cache_item_free);
-static void dns_cache_item_remove_and_free(DnsCache *c, DnsCacheItem *i) {
+static void dns_cache_item_unlink_and_free(DnsCache *c, DnsCacheItem *i) {
DnsCacheItem *first;
assert(c);
@@ -84,34 +89,55 @@ static void dns_cache_item_remove_and_free(DnsCache *c, DnsCacheItem *i) {
dns_cache_item_free(i);
}
-void dns_cache_flush(DnsCache *c) {
- DnsCacheItem *i;
+static bool dns_cache_remove_by_rr(DnsCache *c, DnsResourceRecord *rr) {
+ DnsCacheItem *first, *i;
+ int r;
+
+ first = hashmap_get(c->by_key, rr->key);
+ LIST_FOREACH(by_key, i, first) {
+ r = dns_resource_record_equal(i->rr, rr);
+ if (r < 0)
+ return r;
+ if (r > 0) {
+ dns_cache_item_unlink_and_free(c, i);
+ return true;
+ }
+ }
+
+ return false;
+}
+
+static bool dns_cache_remove_by_key(DnsCache *c, DnsResourceKey *key) {
+ DnsCacheItem *first, *i, *n;
assert(c);
+ assert(key);
- while ((i = hashmap_first(c->by_key)))
- dns_cache_item_remove_and_free(c, i);
+ first = hashmap_remove(c->by_key, key);
+ if (!first)
+ return false;
- assert(hashmap_size(c->by_key) == 0);
- assert(prioq_size(c->by_expiry) == 0);
+ LIST_FOREACH_SAFE(by_key, i, n, first) {
+ prioq_remove(c->by_expiry, i, &i->prioq_idx);
+ dns_cache_item_free(i);
+ }
- c->by_key = hashmap_free(c->by_key);
- c->by_expiry = prioq_free(c->by_expiry);
+ return true;
}
-static bool dns_cache_remove(DnsCache *c, DnsResourceKey *key) {
- DnsCacheItem *i;
- bool exist = false;
+void dns_cache_flush(DnsCache *c) {
+ DnsResourceKey *key;
assert(c);
- assert(key);
- while ((i = hashmap_get(c->by_key, key))) {
- dns_cache_item_remove_and_free(c, i);
- exist = true;
- }
+ while ((key = hashmap_first_key(c->by_key)))
+ dns_cache_remove_by_key(c, key);
- return exist;
+ assert(hashmap_size(c->by_key) == 0);
+ assert(prioq_size(c->by_expiry) == 0);
+
+ c->by_key = hashmap_free(c->by_key);
+ c->by_expiry = prioq_free(c->by_expiry);
}
static void dns_cache_make_space(DnsCache *c, unsigned add) {
@@ -141,7 +167,7 @@ static void dns_cache_make_space(DnsCache *c, unsigned add) {
/* Take an extra reference to the key so that it
* doesn't go away in the middle of the remove call */
key = dns_resource_key_ref(i->key);
- dns_cache_remove(c, key);
+ dns_cache_remove_by_key(c, key);
}
}
@@ -153,7 +179,6 @@ void dns_cache_prune(DnsCache *c) {
/* Remove all entries that are past their TTL */
for (;;) {
- _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
DnsCacheItem *i;
i = prioq_peek(c->by_expiry);
@@ -166,10 +191,19 @@ void dns_cache_prune(DnsCache *c) {
if (i->until > t)
break;
- /* Take an extra reference to the key so that it
- * doesn't go away in the middle of the remove call */
- key = dns_resource_key_ref(i->key);
- dns_cache_remove(c, key);
+ /* Depending whether this is an mDNS shared entry
+ * either remove only this one RR or the whole
+ * RRset */
+ if (i->shared_owner)
+ dns_cache_item_unlink_and_free(c, i);
+ else {
+ _cleanup_(dns_resource_key_unrefp) DnsResourceKey *key = NULL;
+
+ /* Take an extra reference to the key so that it
+ * doesn't go away in the middle of the remove call */
+ key = dns_resource_key_ref(i->key);
+ dns_cache_remove_by_key(c, key);
+ }
}
}
@@ -238,10 +272,20 @@ static DnsCacheItem* dns_cache_get(DnsCache *c, DnsResourceRecord *rr) {
return NULL;
}
-static void dns_cache_item_update_positive(DnsCache *c, DnsCacheItem *i, DnsResourceRecord *rr, bool authenticated, usec_t timestamp) {
+static void dns_cache_item_update_positive(
+ DnsCache *c,
+ DnsCacheItem *i,
+ DnsResourceRecord *rr,
+ bool authenticated,
+ bool shared_owner,
+ usec_t timestamp,
+ int owner_family,
+ const union in_addr_union *owner_address) {
+
assert(c);
assert(i);
assert(rr);
+ assert(owner_address);
i->type = DNS_CACHE_POSITIVE;
@@ -258,8 +302,12 @@ static void dns_cache_item_update_positive(DnsCache *c, DnsCacheItem *i, DnsReso
dns_resource_key_unref(i->key);
i->key = dns_resource_key_ref(rr->key);
- i->authenticated = authenticated;
i->until = timestamp + MIN(rr->ttl * USEC_PER_SEC, CACHE_TTL_MAX_USEC);
+ i->authenticated = authenticated;
+ i->shared_owner = shared_owner;
+
+ i->owner_family = owner_family;
+ i->owner_address = *owner_address;
prioq_reshuffle(c->by_expiry, i, &i->prioq_idx);
}
@@ -268,6 +316,7 @@ static int dns_cache_put_positive(
DnsCache *c,
DnsResourceRecord *rr,
bool authenticated,
+ bool shared_owner,
usec_t timestamp,
int owner_family,
const union in_addr_union *owner_address) {
@@ -275,35 +324,48 @@ static int dns_cache_put_positive(
_cleanup_(dns_cache_item_freep) DnsCacheItem *i = NULL;
_cleanup_free_ char *key_str = NULL;
DnsCacheItem *existing;
- int r;
+ int r, k;
assert(c);
assert(rr);
assert(owner_address);
- /* New TTL is 0? Delete the entry... */
+ /* Never cache pseudo RRs */
+ if (dns_class_is_pseudo(rr->key->class))
+ return 0;
+ if (dns_type_is_pseudo(rr->key->type))
+ return 0;
+
+ /* New TTL is 0? Delete this specific entry... */
if (rr->ttl <= 0) {
- r = dns_resource_key_to_string(rr->key, &key_str);
- if (r < 0)
- return r;
+ k = dns_cache_remove_by_rr(c, rr);
- if (dns_cache_remove(c, rr->key))
- log_debug("Removed zero TTL entry from cache: %s", key_str);
- else
- log_debug("Not caching zero TTL cache entry: %s", key_str);
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(rr->key, &key_str);
+ if (r < 0)
+ return r;
- return 0;
- }
+ if (k > 0)
+ log_debug("Removed zero TTL entry from cache: %s", key_str);
+ else
+ log_debug("Not caching zero TTL cache entry: %s", key_str);
+ }
- if (rr->key->class == DNS_CLASS_ANY)
- return 0;
- if (rr->key->type == DNS_TYPE_ANY)
return 0;
+ }
- /* Entry exists already? Update TTL and timestamp */
+ /* Entry exists already? Update TTL, timestamp and owner*/
existing = dns_cache_get(c, rr);
if (existing) {
- dns_cache_item_update_positive(c, existing, rr, authenticated, timestamp);
+ dns_cache_item_update_positive(
+ c,
+ existing,
+ rr,
+ authenticated,
+ shared_owner,
+ timestamp,
+ owner_family,
+ owner_address);
return 0;
}
@@ -322,20 +384,23 @@ static int dns_cache_put_positive(
i->key = dns_resource_key_ref(rr->key);
i->rr = dns_resource_record_ref(rr);
i->until = timestamp + MIN(i->rr->ttl * USEC_PER_SEC, CACHE_TTL_MAX_USEC);
- i->prioq_idx = PRIOQ_IDX_NULL;
+ i->authenticated = authenticated;
+ i->shared_owner = shared_owner;
i->owner_family = owner_family;
i->owner_address = *owner_address;
- i->authenticated = authenticated;
+ i->prioq_idx = PRIOQ_IDX_NULL;
r = dns_cache_link_item(c, i);
if (r < 0)
return r;
- r = dns_resource_key_to_string(i->key, &key_str);
- if (r < 0)
- return r;
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(i->key, &key_str);
+ if (r < 0)
+ return r;
- log_debug("Added cache entry for %s", key_str);
+ log_debug("Added positive cache entry for %s", key_str);
+ }
i = NULL;
return 0;
@@ -359,18 +424,22 @@ static int dns_cache_put_negative(
assert(key);
assert(owner_address);
- dns_cache_remove(c, key);
-
- if (key->class == DNS_CLASS_ANY)
+ /* Never cache pseudo RR keys. DNS_TYPE_ANY is particularly
+ * important to filter out as we use this as a pseudo-type for
+ * NXDOMAIN entries */
+ if (dns_class_is_pseudo(key->class))
return 0;
- if (key->type == DNS_TYPE_ANY)
+ if (dns_type_is_pseudo(key->type))
return 0;
+
if (soa_ttl <= 0) {
- r = dns_resource_key_to_string(key, &key_str);
- if (r < 0)
- return r;
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(key, &key_str);
+ if (r < 0)
+ return r;
- log_debug("Not caching negative entry with zero SOA TTL: %s", key_str);
+ log_debug("Not caching negative entry with zero SOA TTL: %s", key_str);
+ }
return 0;
}
@@ -389,65 +458,108 @@ static int dns_cache_put_negative(
return -ENOMEM;
i->type = rcode == DNS_RCODE_SUCCESS ? DNS_CACHE_NODATA : DNS_CACHE_NXDOMAIN;
- i->key = dns_resource_key_ref(key);
i->until = timestamp + MIN(soa_ttl * USEC_PER_SEC, CACHE_TTL_MAX_USEC);
- i->prioq_idx = PRIOQ_IDX_NULL;
+ i->authenticated = authenticated;
i->owner_family = owner_family;
i->owner_address = *owner_address;
- i->authenticated = authenticated;
+ i->prioq_idx = PRIOQ_IDX_NULL;
+
+ if (i->type == DNS_CACHE_NXDOMAIN) {
+ /* NXDOMAIN entries should apply equally to all types, so we use ANY as
+ * a pseudo type for this purpose here. */
+ i->key = dns_resource_key_new(key->class, DNS_TYPE_ANY, DNS_RESOURCE_KEY_NAME(key));
+ if (!i->key)
+ return -ENOMEM;
+ } else
+ i->key = dns_resource_key_ref(key);
r = dns_cache_link_item(c, i);
if (r < 0)
return r;
- r = dns_resource_key_to_string(i->key, &key_str);
- if (r < 0)
- return r;
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(i->key, &key_str);
+ if (r < 0)
+ return r;
- log_debug("Added %s cache entry for %s", i->type == DNS_CACHE_NODATA ? "NODATA" : "NXDOMAIN", key_str);
+ log_debug("Added %s cache entry for %s", i->type == DNS_CACHE_NODATA ? "NODATA" : "NXDOMAIN", key_str);
+ }
i = NULL;
return 0;
}
+static void dns_cache_remove_previous(
+ DnsCache *c,
+ DnsResourceKey *key,
+ DnsAnswer *answer) {
+
+ DnsResourceRecord *rr;
+ DnsAnswerFlags flags;
+
+ assert(c);
+
+ /* First, if we were passed a key (i.e. on LLMNR/DNS, but
+ * not on mDNS), delete all matching old RRs, so that we only
+ * keep complete by_key in place. */
+ if (key)
+ dns_cache_remove_by_key(c, key);
+
+ /* Second, flush all entries matching the answer, unless this
+ * is an RR that is explicitly marked to be "shared" between
+ * peers (i.e. mDNS RRs without the flush-cache bit set). */
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ if ((flags & DNS_ANSWER_CACHEABLE) == 0)
+ continue;
+
+ if (flags & DNS_ANSWER_SHARED_OWNER)
+ continue;
+
+ dns_cache_remove_by_key(c, rr->key);
+ }
+}
+
int dns_cache_put(
DnsCache *c,
DnsResourceKey *key,
int rcode,
DnsAnswer *answer,
- unsigned max_rrs,
bool authenticated,
usec_t timestamp,
int owner_family,
const union in_addr_union *owner_address) {
- DnsResourceRecord *soa = NULL;
- unsigned cache_keys, i;
+ DnsResourceRecord *soa = NULL, *rr;
+ DnsAnswerFlags flags;
+ unsigned cache_keys;
int r;
assert(c);
+ assert(owner_address);
- if (key) {
- /* First, if we were passed a key, delete all matching old RRs,
- * so that we only keep complete by_key in place. */
- dns_cache_remove(c, key);
- }
+ dns_cache_remove_previous(c, key, answer);
- if (!answer)
- return 0;
+ if (dns_answer_size(answer) <= 0) {
+ if (log_get_max_level() >= LOG_DEBUG) {
+ _cleanup_free_ char *key_str = NULL;
- for (i = 0; i < answer->n_rrs; i++)
- dns_cache_remove(c, answer->items[i].rr->key);
+ r = dns_resource_key_to_string(key, &key_str);
+ if (r < 0)
+ return r;
+
+ log_debug("Not caching negative entry without a SOA record: %s", key_str);
+ }
+
+ return 0;
+ }
/* We only care for positive replies and NXDOMAINs, on all
* other replies we will simply flush the respective entries,
* and that's it */
-
if (!IN_SET(rcode, DNS_RCODE_SUCCESS, DNS_RCODE_NXDOMAIN))
return 0;
- cache_keys = answer->n_rrs;
-
+ cache_keys = dns_answer_size(answer);
if (key)
cache_keys ++;
@@ -458,58 +570,63 @@ int dns_cache_put(
timestamp = now(clock_boottime_or_monotonic());
/* Second, add in positive entries for all contained RRs */
- for (i = 0; i < MIN(max_rrs, answer->n_rrs); i++) {
- r = dns_cache_put_positive(c, answer->items[i].rr, authenticated, timestamp, owner_family, owner_address);
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ if ((flags & DNS_ANSWER_CACHEABLE) == 0)
+ continue;
+
+ r = dns_cache_put_positive(
+ c,
+ rr,
+ flags & DNS_ANSWER_AUTHENTICATED,
+ flags & DNS_ANSWER_SHARED_OWNER,
+ timestamp,
+ owner_family, owner_address);
if (r < 0)
goto fail;
}
- if (!key)
+ if (!key) /* mDNS doesn't know negative caching, really */
return 0;
/* Third, add in negative entries if the key has no RR */
- r = dns_answer_contains(answer, key);
+ r = dns_answer_match_key(answer, key, NULL);
if (r < 0)
goto fail;
if (r > 0)
return 0;
- /* See https://tools.ietf.org/html/rfc2308, which
- * say that a matching SOA record in the packet
- * is used to to enable negative caching. */
-
- r = dns_answer_find_soa(answer, key, &soa);
+ /* But not if it has a matching CNAME/DNAME (the negative
+ * caching will be done on the canonical name, not on the
+ * alias) */
+ r = dns_answer_find_cname_or_dname(answer, key, NULL, NULL);
if (r < 0)
goto fail;
- if (r == 0)
+ if (r > 0)
return 0;
- /* Also, if the requested key is an alias, the negative response should
- be cached for each name in the redirect chain. Any CNAME record in
- the response is from the redirection chain, though only the final one
- is guaranteed to be included. This means that we cannot verify the
- chain and that we need to cache them all as it may be incomplete. */
- for (i = 0; i < answer->n_rrs; i++) {
- DnsResourceRecord *answer_rr = answer->items[i].rr;
-
- if (answer_rr->key->type == DNS_TYPE_CNAME) {
- _cleanup_(dns_resource_key_unrefp) DnsResourceKey *canonical_key = NULL;
+ /* See https://tools.ietf.org/html/rfc2308, which say that a
+ * matching SOA record in the packet is used to to enable
+ * negative caching. */
- canonical_key = dns_resource_key_new_redirect(key, answer_rr);
- if (!canonical_key)
- goto fail;
-
- /* Let's not add negative cache entries for records outside the current zone. */
- if (!dns_answer_match_soa(canonical_key, soa->key))
- continue;
+ r = dns_answer_find_soa(answer, key, &soa, &flags);
+ if (r < 0)
+ goto fail;
+ if (r == 0)
+ return 0;
- r = dns_cache_put_negative(c, canonical_key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address);
- if (r < 0)
- goto fail;
- }
- }
+ /* Refuse using the SOA data if it is unsigned, but the key is
+ * signed */
+ if (authenticated && (flags & DNS_ANSWER_AUTHENTICATED) == 0)
+ return 0;
- r = dns_cache_put_negative(c, key, rcode, authenticated, timestamp, MIN(soa->soa.minimum, soa->ttl), owner_family, owner_address);
+ r = dns_cache_put_negative(
+ c,
+ key,
+ rcode,
+ authenticated,
+ timestamp,
+ MIN(soa->soa.minimum, soa->ttl),
+ owner_family, owner_address);
if (r < 0)
goto fail;
@@ -520,10 +637,14 @@ fail:
* added, just in case */
if (key)
- dns_cache_remove(c, key);
+ dns_cache_remove_by_key(c, key);
- for (i = 0; i < answer->n_rrs; i++)
- dns_cache_remove(c, answer->items[i].rr->key);
+ DNS_ANSWER_FOREACH_FLAGS(rr, flags, answer) {
+ if ((flags & DNS_ANSWER_CACHEABLE) == 0)
+ continue;
+
+ dns_cache_remove_by_key(c, rr->key);
+ }
return r;
}
@@ -540,36 +661,48 @@ static DnsCacheItem *dns_cache_get_by_key_follow_cname_dname_nsec(DnsCache *c, D
* much, after all this is just a cache */
i = hashmap_get(c->by_key, k);
- if (i || IN_SET(k->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME, DNS_TYPE_NSEC))
+ if (i)
return i;
n = DNS_RESOURCE_KEY_NAME(k);
- /* Check if we have an NSEC record instead for the name. */
- i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_NSEC, n));
- if (i)
+ /* Check if we have an NXDOMAIN cache item for the name, notice that we use
+ * the pseudo-type ANY for NXDOMAIN cache items. */
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_ANY, n));
+ if (i && i->type == DNS_CACHE_NXDOMAIN)
return i;
- /* Check if we have a CNAME record instead */
- i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_CNAME, n));
- if (i)
- return i;
+ /* The following record types should never be redirected. See
+ * <https://tools.ietf.org/html/rfc4035#section-2.5>. */
+ if (!IN_SET(k->type, DNS_TYPE_CNAME, DNS_TYPE_DNAME,
+ DNS_TYPE_NSEC3, DNS_TYPE_NSEC, DNS_TYPE_RRSIG,
+ DNS_TYPE_NXT, DNS_TYPE_SIG, DNS_TYPE_KEY)) {
+ /* Check if we have a CNAME record instead */
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_CNAME, n));
+ if (i)
+ return i;
- /* OK, let's look for cached DNAME records. */
- for (;;) {
- char label[DNS_LABEL_MAX];
+ /* OK, let's look for cached DNAME records. */
+ for (;;) {
+ if (isempty(n))
+ return NULL;
- if (isempty(n))
- return NULL;
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_DNAME, n));
+ if (i)
+ return i;
+
+ /* Jump one label ahead */
+ r = dns_name_parent(&n);
+ if (r <= 0)
+ return NULL;
+ }
+ }
- i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_DNAME, n));
+ if (k->type != DNS_TYPE_NSEC) {
+ /* Check if we have an NSEC record instead for the name. */
+ i = hashmap_get(c->by_key, &DNS_RESOURCE_KEY_CONST(k->class, DNS_TYPE_NSEC, n));
if (i)
return i;
-
- /* Jump one label ahead */
- r = dns_label_unescape(&n, label, sizeof(label));
- if (r <= 0)
- return NULL;
}
return NULL;
@@ -596,11 +729,13 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
/* If we have ANY lookups we don't use the cache, so
* that the caller refreshes via the network. */
- r = dns_resource_key_to_string(key, &key_str);
- if (r < 0)
- return r;
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(key, &key_str);
+ if (r < 0)
+ return r;
- log_debug("Ignoring cache for ANY lookup: %s", key_str);
+ log_debug("Ignoring cache for ANY lookup: %s", key_str);
+ }
*ret = NULL;
*rcode = DNS_RCODE_SUCCESS;
@@ -611,11 +746,13 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
if (!first) {
/* If one question cannot be answered we need to refresh */
- r = dns_resource_key_to_string(key, &key_str);
- if (r < 0)
- return r;
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(key, &key_str);
+ if (r < 0)
+ return r;
- log_debug("Cache miss for %s", key_str);
+ log_debug("Cache miss for %s", key_str);
+ }
*ret = NULL;
*rcode = DNS_RCODE_SUCCESS;
@@ -637,15 +774,17 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
have_non_authenticated = true;
}
- r = dns_resource_key_to_string(key, &key_str);
- if (r < 0)
- return r;
-
if (nsec && key->type != DNS_TYPE_NSEC) {
- log_debug("NSEC NODATA cache hit for %s", key_str);
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(key, &key_str);
+ if (r < 0)
+ return r;
+
+ log_debug("NSEC NODATA cache hit for %s", key_str);
+ }
/* We only found an NSEC record that matches our name.
- * If it says the type doesn't exit report
+ * If it says the type doesn't exist report
* NODATA. Otherwise report a cache miss. */
*ret = NULL;
@@ -657,10 +796,16 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
!bitmap_isset(nsec->rr->nsec.types, DNS_TYPE_DNAME);
}
- log_debug("%s cache hit for %s",
- n > 0 ? "Positive" :
- nxdomain ? "NXDOMAIN" : "NODATA",
- key_str);
+ if (log_get_max_level() >= LOG_DEBUG) {
+ r = dns_resource_key_to_string(key, &key_str);
+ if (r < 0)
+ return r;
+
+ log_debug("%s cache hit for %s",
+ n > 0 ? "Positive" :
+ nxdomain ? "NXDOMAIN" : "NODATA",
+ key_str);
+ }
if (n <= 0) {
*ret = NULL;
@@ -677,7 +822,7 @@ int dns_cache_lookup(DnsCache *c, DnsResourceKey *key, int *rcode, DnsAnswer **r
if (!j->rr)
continue;
- r = dns_answer_add(answer, j->rr, 0);
+ r = dns_answer_add(answer, j->rr, 0, j->authenticated ? DNS_ANSWER_AUTHENTICATED : 0);
if (r < 0)
return r;
}
@@ -726,6 +871,55 @@ int dns_cache_check_conflicts(DnsCache *cache, DnsResourceRecord *rr, int owner_
return 1;
}
+int dns_cache_export_shared_to_packet(DnsCache *cache, DnsPacket *p) {
+ unsigned ancount = 0;
+ Iterator iterator;
+ DnsCacheItem *i;
+ int r;
+
+ assert(cache);
+ assert(p);
+
+ HASHMAP_FOREACH(i, cache->by_key, iterator) {
+ DnsCacheItem *j;
+
+ LIST_FOREACH(by_key, j, i) {
+ if (!j->rr)
+ continue;
+
+ if (!j->shared_owner)
+ continue;
+
+ r = dns_packet_append_rr(p, j->rr, NULL, NULL);
+ if (r == -EMSGSIZE && p->protocol == DNS_PROTOCOL_MDNS) {
+ /* For mDNS, if we're unable to stuff all known answers into the given packet,
+ * allocate a new one, push the RR into that one and link it to the current one.
+ */
+
+ DNS_PACKET_HEADER(p)->ancount = htobe16(ancount);
+ ancount = 0;
+
+ r = dns_packet_new_query(&p->more, p->protocol, 0, true);
+ if (r < 0)
+ return r;
+
+ /* continue with new packet */
+ p = p->more;
+ r = dns_packet_append_rr(p, j->rr, NULL, NULL);
+ }
+
+ if (r < 0)
+ return r;
+
+ ancount ++;
+ }
+ }
+
+ DNS_PACKET_HEADER(p)->ancount = htobe16(ancount);
+
+ return 0;
+}
+
void dns_cache_dump(DnsCache *cache, FILE *f) {
Iterator iterator;
DnsCacheItem *i;
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2025-05-23 14:08:10 +0000