1 files changed, 34 insertions, 0 deletions
diff --git a/internal/dns/rr_a.go b/internal/dns/rr_a.go
new file mode 100644
index 0000000..3886ed9
--- /dev/null
+++ b/internal/dns/rr_a.go
@@ -0,0 +1,34 @@
+package dns
+
+import (
+	"fmt"
+	"net/netip"
+)
+
+type A struct {
+	Addr netip.Addr
+}
+
+func (a *A) Type() uint16 {
+	return TypeA
+}
+
+func (a *A) Pack(p *packer) error {
+	b := a.Addr.As4()
+	p.buf = append(p.buf, b[:]...)
+	return nil
+}
+
+func (a *A) Unpack(u *unpacker, length uint16) error {
+	if length != 4 {
+		return fmt.Errorf("dns: A rdata length %d != 4", length)
+	}
+	if u.off+4 > len(u.buf) {
+		return fmt.Errorf("dns: short A rdata")
+	}
+	a.Addr = netip.AddrFrom4([4]byte(u.buf[u.off : u.off+4]))
+	u.off += 4
+	return nil
+}
+
+func (a *A) String() string { return a.Addr.String() }