all: sync with master

internal/dhcpsvc/lease.go

@@ -0,0 +1,52 @@
+package dhcpsvc
+
+import (
+	"bytes"
+	"net"
+	"net/netip"
+	"slices"
+	"time"
+)
+
+// Lease is a DHCP lease.
+//
+// TODO(e.burkov):  Consider moving it to [agh], since it also may be needed in
+// [websvc].
+//
+// TODO(e.burkov):  Add validation method.
+type Lease struct {
+	// IP is the IP address leased to the client.
+	IP netip.Addr
+
+	// Expiry is the expiration time of the lease.
+	Expiry time.Time
+
+	// Hostname of the client.
+	Hostname string
+
+	// HWAddr is the physical hardware address (MAC address).
+	HWAddr net.HardwareAddr
+
+	// IsStatic defines if the lease is static.
+	IsStatic bool
+}
+
+// Clone returns a deep copy of l.
+func (l *Lease) Clone() (clone *Lease) {
+	if l == nil {
+		return nil
+	}
+
+	return &Lease{
+		Expiry:   l.Expiry,
+		Hostname: l.Hostname,
+		HWAddr:   slices.Clone(l.HWAddr),
+		IP:       l.IP,
+		IsStatic: l.IsStatic,
+	}
+}
+
+// compareLeaseMAC compares two [Lease]s by hardware address.
+func compareLeaseMAC(a, b *Lease) (res int) {
+	return bytes.Compare(a.HWAddr, b.HWAddr)
+}