func (c *client) Request(id ID) (*dhcp.Packet, error) {
log.Debugf("id: %+v", id)
// send the request over a raw socket
raw, err := dhcp4client.NewPacketSock(id.IfIndex)
if err != nil {
return nil, err
}
rawc, err := dhcp4client.New(dhcp4client.Connection(raw), dhcp4client.Timeout(c.timeout), dhcp4client.HardwareAddr(id.HardwareAddr))
if err != nil {
return nil, err
}
defer rawc.Close()
success := false
var p *dhcp.Packet
err = withRetry(func() error {
var err error
success, p, err = c.request(id, rawc)
return err
})
if err != nil {
return nil, err
}
if !success {
return nil, fmt.Errorf("failed dhcp request")
}
log.Debugf("%+v", p)
return p, nil
}
func newDHCPClient(link netlink.Link) (*dhcp4client.Client, error) {
pktsock, err := dhcp4client.NewPacketSock(link.Attrs().Index)
if err != nil {
return nil, err
}
return dhcp4client.New(
dhcp4client.HardwareAddr(link.Attrs().HardwareAddr),
dhcp4client.Timeout(5*time.Second),
dhcp4client.Broadcast(false),
dhcp4client.Connection(pktsock),
)
}
func (c *client) newClient(ack *dhcp.Packet) (*dhcp4client.Client, error) {
conn, err := dhcp4client.NewInetSock(dhcp4client.SetRemoteAddr(net.UDPAddr{IP: ack.ServerIP(), Port: 67}))
if err != nil {
return nil, err
}
cl, err := dhcp4client.New(dhcp4client.Connection(conn), dhcp4client.Timeout(c.timeout))
if err != nil {
return nil, err
}
return cl, nil
}
func (c *client) newClient() (*dhcp4client.Client, error) {
defer trace.End(trace.Begin(""))
ack := dhcp.NewPacket(c.ack)
conn, err := dhcp4client.NewInetSock(dhcp4client.SetRemoteAddr(net.UDPAddr{IP: ack.ServerIP(), Port: 67}))
if err != nil {
return nil, err
}
cl, err := dhcp4client.New(dhcp4client.Connection(conn), dhcp4client.Timeout(c.timeout))
if err != nil {
return nil, err
}
return cl, nil
}
func (c *client) Request() error {
defer trace.End(trace.Begin(""))
log.Debugf("id: %+v", c.id)
// send the request over a raw socket
raw, err := dhcp4client.NewPacketSock(c.id.IfIndex)
if err != nil {
return err
}
rawc, err := dhcp4client.New(
dhcp4client.Connection(raw),
dhcp4client.Timeout(c.timeout),
dhcp4client.HardwareAddr(c.id.HardwareAddr))
if err != nil {
return err
}
defer rawc.Close()
success := false
var p dhcp4.Packet
err = withRetry(func() error {
var err error
success, p, err = c.request(rawc)
return err
})
if err != nil {
return err
}
if !success {
return fmt.Errorf("failed dhcp request")
}
log.Debugf("%+v", p)
c.ack = p
return nil
}