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// This is lease support for nclient4
package nclient4
import (
"fmt"
"net"
"time"
"github.com/insomniacslk/dhcp/dhcpv4"
)
// Lease contains a DHCPv4 lease after DORA.
// note: Lease doesn't include binding interface name
type Lease struct {
Offer *dhcpv4.DHCPv4
ACK *dhcpv4.DHCPv4
CreationTime time.Time
}
// Release send DHCPv4 release messsage to server, based on specified lease.
// release is sent as unicast per RFC2131, section 4.4.4.
// Note: some DHCP server requries of using assigned IP address as source IP,
// use nclient4.WithUnicast to create client for such case.
func (c *Client) Release(lease *Lease, modifiers ...dhcpv4.Modifier) error {
if lease == nil {
return fmt.Errorf("lease is nil")
}
req, err := dhcpv4.NewReleaseFromACK(lease.ACK, modifiers...)
if err != nil {
return fmt.Errorf("fail to create release request,%w", err)
}
_, err = c.conn.WriteTo(req.ToBytes(), &net.UDPAddr{IP: lease.ACK.Options.Get(dhcpv4.OptionServerIdentifier), Port: ServerPort})
if err == nil {
c.logger.PrintMessage("sent message:", req)
}
return err
}
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