mirror of
https://github.com/yunionio/cloudpods.git
synced 2026-11-05 23:41:47 +08:00
102 lines
2.6 KiB
Go
102 lines
2.6 KiB
Go
// Copyright 2019 Yunion
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package dhcp
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import (
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"fmt"
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"net"
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"runtime/debug"
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"yunion.io/x/log"
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)
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type DHCPServer struct {
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Address string
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Port int
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conn *Conn
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}
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func NewDHCPServer(address string, port int) *DHCPServer {
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return &DHCPServer{
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Address: address,
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Port: port,
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}
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}
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func NewDHCPServer2(address string, port int, disableBroadcast bool) (*DHCPServer, *Conn, error) {
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conn, err := NewSocketConn(fmt.Sprintf("%s:%d", address, port), disableBroadcast)
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if err != nil {
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return nil, nil, err
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}
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return &DHCPServer{
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Address: address,
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Port: port,
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conn: conn,
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}, conn, nil
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}
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type DHCPHandler interface {
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ServeDHCP(pkt Packet, addr *net.UDPAddr, intf *net.Interface) (Packet, error)
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}
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func (s *DHCPServer) ListenAndServe(handler DHCPHandler) error {
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if s.conn == nil {
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dhcpAddr := fmt.Sprintf("%s:%d", s.Address, s.Port)
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dhcpConn, err := NewConn(dhcpAddr, false)
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if err != nil {
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return fmt.Errorf("Listen DHCP connection error: %v", err)
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}
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s.conn = dhcpConn
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}
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defer s.conn.Close()
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return s.serveDHCP(handler)
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}
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func (s *DHCPServer) serveDHCP(handler DHCPHandler) error {
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for {
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pkt, addr, intf, err := s.conn.RecvDHCP()
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if err != nil {
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return fmt.Errorf("Receiving DHCP packet: %s", err)
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}
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// if intf == nil {
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// return fmt.Errorf("Received DHCP packet with no interface information (this is a violation of dhcp4.Conn's contract)")
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// }
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go func() {
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defer func() {
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if r := recover(); r != nil {
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log.Errorf("Serve panic error: %v", r)
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debug.PrintStack()
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}
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}()
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resp, err := handler.ServeDHCP(pkt, addr, intf)
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if err != nil {
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log.Warningf("[DHCP] handler serve error: %v", err)
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return
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}
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if resp == nil {
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// log.Warningf("[DHCP] hander response null packet")
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return
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}
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//log.Debugf("[DHCP] send response packet: %s to interface: %#v", resp.DebugString(), intf)
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if err = s.conn.SendDHCP(resp, addr, intf); err != nil {
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log.Errorf("[DHCP] failed to response packet for %s: %v", pkt.CHAddr(), err)
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return
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}
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}()
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}
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}
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