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Pull request: * dhcpd: send secondary dns as well

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Merge in DNS/adguard-home from 1708-secondary-dns to master

Updates #1708.

Squashed commit of the following:

commit 4529452e31131763f00c9c834cc95638f1a3d142
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Nov 9 18:12:57 2020 +0300

    * dhcpd: send secondary dns as well
This commit is contained in:
Ainar Garipov
2020-11-09 19:27:04 +03:00
parent 1e583315a8
commit 3cc5bf210d
5 changed files with 152 additions and 85 deletions
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46
internal/dhcpd/v6.go
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@@ -537,24 +537,25 @@ func (s *v6Server) packetHandler(conn net.PacketConn, peer net.Addr, req dhcpv6.
}
}
// Get IPv6 address list
func getIfaceIPv6(iface net.Interface) []net.IP {
// ifaceIPv6Addrs returns the interface's IPv6 addresses.
func ifaceIPv6Addrs(iface *net.Interface) (ips []net.IP, err error) {
addrs, err := iface.Addrs()
if err != nil {
return nil
return nil, err
}
var res []net.IP
for _, a := range addrs {
ipnet, ok := a.(*net.IPNet)
if !ok {
continue
}
if ipnet.IP.To4() == nil {
res = append(res, ipnet.IP)
if ip := ipnet.IP.To16(); ip != nil {
ips = append(ips, ip)
}
}
return res
return ips, nil
}
// initialize RA module
@@ -578,23 +579,40 @@ func (s *v6Server) initRA(iface *net.Interface) error {
return s.ra.Init()
}
// Start - start server
// Start starts the IPv6 DHCP server.
func (s *v6Server) Start() error {
if !s.conf.Enabled {
return nil
}
iface, err := net.InterfaceByName(s.conf.InterfaceName)
ifaceName := s.conf.InterfaceName
iface, err := net.InterfaceByName(ifaceName)
if err != nil {
return fmt.Errorf("couldn't find interface by name %s: %w", s.conf.InterfaceName, err)
return fmt.Errorf("dhcpv6: finding interface %s by name: %w", ifaceName, err)
}
s.conf.dnsIPAddrs = getIfaceIPv6(*iface)
if len(s.conf.dnsIPAddrs) == 0 {
log.Debug("DHCPv6: no IPv6 address for interface %s", iface.Name)
return nil
log.Debug("dhcpv4: starting...")
dnsIPAddrs, err := ifaceIPv6Addrs(iface)
if err != nil {
return fmt.Errorf("dhcpv6: getting ipv6 addrs for iface %s: %w", ifaceName, err)
}
switch len(dnsIPAddrs) {
case 0:
log.Debug("dhcpv6: no ipv6 address for interface %s", iface.Name)
return nil
case 1:
// See the comment in (*v4Server).Start.
log.Debug("dhcpv6: setting secondary dns ip to iself for interface %s", iface.Name)
dnsIPAddrs = append(dnsIPAddrs, dnsIPAddrs[0])
default:
// Go on.
}
s.conf.dnsIPAddrs = dnsIPAddrs
err = s.initRA(iface)
if err != nil {
return err