/* The various DNS protocols deviate in how large a packet can grow,
but the TCP transport has a 16bit size field, hence that appears to
- be the maximum. */
+ be the absolute maximum. */
#define DNS_PACKET_SIZE_MAX 0xFFFF
+
+/* RFC 1035 say 512 is the maximum, for classic unicast DNS */
+#define DNS_PACKET_UNICAST_SIZE_MAX 512
+
#define DNS_PACKET_SIZE_START 512
struct DnsPacket {
int ifindex;
size_t size, allocated, rindex;
Hashmap *names; /* For name compression */
+ DnsResourceRecord **rrs;
void *data;
};
((uint16_t) !!cd << 4) | \
((uint16_t) (rcode & 15)))
+static inline unsigned DNS_PACKET_RRCOUNT(DnsPacket *p) {
+ return
+ (unsigned) DNS_PACKET_ANCOUNT(p) +
+ (unsigned) DNS_PACKET_NSCOUNT(p) +
+ (unsigned) DNS_PACKET_ARCOUNT(p);
+}
int dns_packet_new(DnsPacket **p, size_t mtu);
int dns_packet_new_query(DnsPacket **p, size_t mtu);
void dns_packet_rewind(DnsPacket *p, size_t idx);
int dns_packet_skip_question(DnsPacket *p);
+int dns_packet_extract_rrs(DnsPacket *p);
enum {
DNS_RCODE_SUCCESS = 0,