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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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64
internal/dhcpd/v4.go
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@@ -36,7 +36,7 @@ func (s *v4Server) WriteDiskConfig6(c *V6ServerConf) {
}
// Return TRUE if IP address is within range [start..stop]
func ip4InRange(start net.IP, stop net.IP, ip net.IP) bool {
func ip4InRange(start, stop, ip net.IP) bool {
if len(start) != 4 || len(stop) != 4 {
return false
}
@@ -335,7 +335,7 @@ func (s *v4Server) commitLease(l *Lease) {
}
// Process Discover request and return lease
func (s *v4Server) processDiscover(req *dhcpv4.DHCPv4, resp *dhcpv4.DHCPv4) *Lease {
func (s *v4Server) processDiscover(req, resp *dhcpv4.DHCPv4) *Lease {
mac := req.ClientHWAddr
s.leasesLock.Lock()
@@ -409,7 +409,7 @@ func (o *optFQDN) ToBytes() []byte {
// Process Request request and return lease
// Return false if we don't need to reply
func (s *v4Server) processRequest(req *dhcpv4.DHCPv4, resp *dhcpv4.DHCPv4) (*Lease, bool) {
func (s *v4Server) processRequest(req, resp *dhcpv4.DHCPv4) (*Lease, bool) {
var lease *Lease
mac := req.ClientHWAddr
hostname := req.Options.Get(dhcpv4.OptionHostName)
@@ -472,7 +472,7 @@ func (s *v4Server) processRequest(req *dhcpv4.DHCPv4, resp *dhcpv4.DHCPv4) (*Lea
// Return 1: OK
// Return 0: error; reply with Nak
// Return -1: error; don't reply
func (s *v4Server) process(req *dhcpv4.DHCPv4, resp *dhcpv4.DHCPv4) int {
func (s *v4Server) process(req, resp *dhcpv4.DHCPv4) int {
var lease *Lease
resp.UpdateOption(dhcpv4.OptServerIdentifier(s.conf.dnsIPAddrs[0]))
@@ -554,24 +554,65 @@ func (s *v4Server) packetHandler(conn net.PacketConn, peer net.Addr, req *dhcpv4
}
}
// Start - start server
// ifaceIPv4Addrs returns the interface's IPv4 addresses.
func ifaceIPv4Addrs(iface *net.Interface) (ips []net.IP, err error) {
addrs, err := iface.Addrs()
if err != nil {
return nil, err
}
for _, a := range addrs {
ipnet, ok := a.(*net.IPNet)
if !ok {
continue
}
if ip := ipnet.IP.To4(); ip != nil {
ips = append(ips, ip)
}
}
return ips, nil
}
// Start starts the IPv4 DHCP server.
func (s *v4Server) 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("dhcpv4: Couldn't find interface by name %s: %w", s.conf.InterfaceName, err)
return fmt.Errorf("dhcpv4: finding interface %s by name: %w", ifaceName, err)
}
log.Debug("dhcpv4: starting...")
s.conf.dnsIPAddrs = getIfaceIPv4(*iface)
if len(s.conf.dnsIPAddrs) == 0 {
log.Debug("dhcpv4: no IPv6 address for interface %s", iface.Name)
return nil
dnsIPAddrs, err := ifaceIPv4Addrs(iface)
if err != nil {
return fmt.Errorf("dhcpv4: getting ipv4 addrs for iface %s: %w", ifaceName, err)
}
switch len(dnsIPAddrs) {
case 0:
log.Debug("dhcpv4: no ipv4 address for interface %s", iface.Name)
return nil
case 1:
// Some Android devices use 8.8.8.8 if there is no secondary DNS
// server. Fix that by setting the secondary DNS address to our
// address as well.
//
// See https://github.com/AdguardTeam/AdGuardHome/issues/1708.
log.Debug("dhcpv4: setting secondary dns ip to iself for interface %s", iface.Name)
dnsIPAddrs = append(dnsIPAddrs, dnsIPAddrs[0])
default:
// Go on.
}
s.conf.dnsIPAddrs = dnsIPAddrs
laddr := &net.UDPAddr{
IP: net.ParseIP("0.0.0.0"),
Port: dhcpv4.ServerPort,
@@ -587,6 +628,7 @@ func (s *v4Server) Start() error {
err = s.srv.Serve()
log.Debug("dhcpv4: srv.Serve: %s", err)
}()
return nil
}