mirror of
https://github.com/coredhcp/coredhcp.git
synced 2025-10-25 22:21:24 +02:00
81 lines
2.2 KiB
Go
81 lines
2.2 KiB
Go
// Copyright 2018-present the CoreDHCP Authors. All rights reserved
|
|
// This source code is licensed under the MIT license found in the
|
|
// LICENSE file in the root directory of this source tree.
|
|
|
|
package dns
|
|
|
|
import (
|
|
"errors"
|
|
"net"
|
|
|
|
"github.com/coredhcp/coredhcp/handler"
|
|
"github.com/coredhcp/coredhcp/logger"
|
|
"github.com/coredhcp/coredhcp/plugins"
|
|
"github.com/insomniacslk/dhcp/dhcpv4"
|
|
"github.com/insomniacslk/dhcp/dhcpv6"
|
|
)
|
|
|
|
var log = logger.GetLogger("plugins/dns")
|
|
|
|
func init() {
|
|
plugins.RegisterPlugin("dns", setupDNS6, setupDNS4)
|
|
}
|
|
|
|
var (
|
|
dnsServers6 []net.IP
|
|
dnsServers4 []net.IP
|
|
)
|
|
|
|
func setupDNS6(args ...string) (handler.Handler6, error) {
|
|
if len(args) < 1 {
|
|
return nil, errors.New("need at least one DNS server")
|
|
}
|
|
for _, arg := range args {
|
|
server := net.ParseIP(arg)
|
|
if server.To16() == nil {
|
|
return Handler6, errors.New("expected an DNS server address, got: " + arg)
|
|
}
|
|
dnsServers6 = append(dnsServers6, server)
|
|
}
|
|
log.Infof("loaded %d DNS servers.", len(dnsServers6))
|
|
return Handler6, nil
|
|
}
|
|
|
|
func setupDNS4(args ...string) (handler.Handler4, error) {
|
|
log.Printf("loaded plugin for DHCPv4.")
|
|
if len(args) < 1 {
|
|
return nil, errors.New("need at least one DNS server")
|
|
}
|
|
for _, arg := range args {
|
|
DNSServer := net.ParseIP(arg)
|
|
if DNSServer.To4() == nil {
|
|
return Handler4, errors.New("expected an DNS server address, got: " + arg)
|
|
}
|
|
dnsServers4 = append(dnsServers4, DNSServer)
|
|
}
|
|
log.Infof("loaded %d DNS servers.", len(dnsServers4))
|
|
return Handler4, nil
|
|
}
|
|
|
|
// Handler6 handles DHCPv6 packets for the dns plugin
|
|
func Handler6(req, resp dhcpv6.DHCPv6) (dhcpv6.DHCPv6, bool) {
|
|
decap, err := req.GetInnerMessage()
|
|
if err != nil {
|
|
log.Errorf("Could not decapsulate relayed message, aborting: %v", err)
|
|
return nil, true
|
|
}
|
|
|
|
if decap.IsOptionRequested(dhcpv6.OptionDNSRecursiveNameServer) {
|
|
resp.UpdateOption(&dhcpv6.OptDNSRecursiveNameServer{NameServers: dnsServers6})
|
|
}
|
|
return resp, false
|
|
}
|
|
|
|
//Handler4 handles DHCPv4 packets for the dns plugin
|
|
func Handler4(req, resp *dhcpv4.DHCPv4) (*dhcpv4.DHCPv4, bool) {
|
|
if req.IsOptionRequested(dhcpv4.OptionDomainNameServer) {
|
|
resp.Options.Update(dhcpv4.OptDNS(dnsServers4...))
|
|
}
|
|
return resp, false
|
|
}
|