resolved: add DNS cache

1 files changed, 151 insertions, 0 deletions

diff --git a/src/resolve/resolved-dns-rr.c b/src/resolve/resolved-dns-rr.c
index cb555cb4ef..c8f7cf4a4c 100644
--- a/src/resolve/resolved-dns-rr.c
+++ b/src/resolve/resolved-dns-rr.c
@@ -19,6 +19,7 @@
   along with systemd; If not, see <http://www.gnu.org/licenses/>.
 ***/
 
+#include "resolved-dns-domain.h"
 #include "resolved-dns-rr.h"
 
 void dns_resource_key_free(DnsResourceKey *key) {
@@ -29,6 +30,38 @@ void dns_resource_key_free(DnsResourceKey *key) {
         zero(*key);
 }
 
+unsigned long dns_resource_key_hash_func(const void *i, const uint8_t hash_key[HASH_KEY_SIZE]) {
+        const DnsResourceKey *k = i;
+        unsigned long ul;
+
+        ul = dns_name_hash_func(k->name, hash_key);
+        ul = ul * hash_key[0] + ul + k->class;
+        ul = ul * hash_key[1] + ul + k->type;
+
+        return ul;
+}
+
+int dns_resource_key_compare_func(const void *a, const void *b) {
+        const DnsResourceKey *x = a, *y = b;
+        int ret;
+
+        ret = dns_name_compare_func(x->name, y->name);
+        if (ret != 0)
+                return ret;
+
+        if (x->type < y->type)
+                return -1;
+        if (x->type > y->type)
+                return 1;
+
+        if (x->class < y->class)
+                return -1;
+        if (x->class > y->class)
+                return 1;
+
+        return 0;
+}
+
 DnsResourceRecord* dns_resource_record_new(void) {
         DnsResourceRecord *rr;
 
@@ -74,3 +107,121 @@ DnsResourceRecord* dns_resource_record_unref(DnsResourceRecord *rr) {
 
         return NULL;
 }
+
+DnsResourceRecord** dns_resource_record_freev(DnsResourceRecord **rrs, unsigned n) {
+        unsigned i;
+
+        assert(n == 0 || rrs);
+
+        for (i = 0; i < n; i++)
+                dns_resource_record_unref(rrs[i]);
+
+        free(rrs);
+        return NULL;
+}
+
+int dns_resource_record_equal(const DnsResourceRecord *a, const DnsResourceRecord *b) {
+        int r;
+
+        assert(a);
+        assert(b);
+
+        r = dns_name_equal(a->key.name, b->key.name);
+        if (r <= 0)
+                return r;
+
+        if (a->key.class != b->key.class)
+                return 0;
+
+        if (a->key.type != b->key.type)
+                return 0;
+
+        if (IN_SET(a->key.type, DNS_TYPE_PTR, DNS_TYPE_NS, DNS_TYPE_CNAME))
+                return dns_name_equal(a->ptr.name, b->ptr.name);
+        else if (a->key.type == DNS_TYPE_HINFO)
+                return strcasecmp(a->hinfo.cpu, b->hinfo.cpu) == 0 &&
+                       strcasecmp(a->hinfo.os, b->hinfo.os) == 0;
+        else if (a->key.type == DNS_TYPE_A)
+                return memcmp(&a->a.in_addr, &b->a.in_addr, sizeof(struct in_addr)) == 0;
+        else if (a->key.type == DNS_TYPE_AAAA)
+                return memcmp(&a->aaaa.in6_addr, &b->aaaa.in6_addr, sizeof(struct in6_addr)) == 0;
+        else
+                return a->generic.size == b->generic.size &&
+                        memcmp(a->generic.data, b->generic.data, a->generic.size) == 0;
+}
+
+const char *dns_class_to_string(uint16_t class) {
+
+        switch (class) {
+
+        case DNS_CLASS_IN:
+                return "IN";
+
+        case DNS_CLASS_ANY:
+                return "ANY";
+        }
+
+        return NULL;
+}
+
+const char *dns_type_to_string(uint16_t type) {
+
+        switch (type) {
+
+        case DNS_TYPE_A:
+                return "A";
+
+        case DNS_TYPE_NS:
+                return "NS";
+
+        case DNS_TYPE_CNAME:
+                return "CNAME";
+
+        case DNS_TYPE_SOA:
+                return "SOA";
+
+        case DNS_TYPE_PTR:
+                return "PTR";
+
+        case DNS_TYPE_HINFO:
+                return "HINFO";
+
+        case DNS_TYPE_MX:
+                return "MX";
+
+        case DNS_TYPE_TXT:
+                return "TXT";
+
+        case DNS_TYPE_AAAA:
+                return "AAAA";
+
+        case DNS_TYPE_SRV:
+                return "SRV";
+
+        case DNS_TYPE_SSHFP:
+                return "SSHFP";
+
+        case DNS_TYPE_DNAME:
+                return "DNAME";
+
+        case DNS_TYPE_ANY:
+                return "ANY";
+
+        case DNS_TYPE_OPT:
+                return "OPT";
+
+        case DNS_TYPE_TKEY:
+                return "TKEY";
+
+        case DNS_TYPE_TSIG:
+                return "TSIG";
+
+        case DNS_TYPE_IXFR:
+                return "IXFR";
+
+        case DNS_TYPE_AXFR:
+                return "AXFR";
+        }
+
+        return NULL;
+}