67 lines
1.7 KiB
Go
67 lines
1.7 KiB
Go
package dhcpsvc
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import (
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"fmt"
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"slices"
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"time"
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)
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// netInterface is a common part of any network interface within the DHCP
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// server.
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//
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// TODO(e.burkov): Add other methods as [DHCPServer] evolves.
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type netInterface struct {
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// name is the name of the network interface.
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name string
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// leases is a set of leases sorted by hardware address.
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leases []*Lease
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// leaseTTL is the default Time-To-Live value for leases.
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leaseTTL time.Duration
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}
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// reset clears all the slices in iface for reuse.
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func (iface *netInterface) reset() {
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iface.leases = iface.leases[:0]
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}
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// insertLease inserts the given lease into iface. It returns an error if the
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// lease can't be inserted.
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func (iface *netInterface) insertLease(l *Lease) (err error) {
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i, found := slices.BinarySearchFunc(iface.leases, l, compareLeaseMAC)
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if found {
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return fmt.Errorf("lease for mac %s already exists", l.HWAddr)
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}
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iface.leases = slices.Insert(iface.leases, i, l)
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return nil
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}
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// updateLease replaces an existing lease within iface with the given one. It
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// returns an error if there is no lease with such hardware address.
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func (iface *netInterface) updateLease(l *Lease) (prev *Lease, err error) {
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i, found := slices.BinarySearchFunc(iface.leases, l, compareLeaseMAC)
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if !found {
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return nil, fmt.Errorf("no lease for mac %s", l.HWAddr)
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}
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prev, iface.leases[i] = iface.leases[i], l
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return prev, nil
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}
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// removeLease removes an existing lease from iface. It returns an error if
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// there is no lease equal to l.
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func (iface *netInterface) removeLease(l *Lease) (err error) {
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i, found := slices.BinarySearchFunc(iface.leases, l, compareLeaseMAC)
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if !found {
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return fmt.Errorf("no lease for mac %s", l.HWAddr)
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}
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iface.leases = slices.Delete(iface.leases, i, i+1)
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return nil
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}
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