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Pull request: dhcpd: wait for interfaces' ip addresses to appear

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Merge in DNS/adguard-home from 2304-dncp-backoff to master

Updates #2304.

Squashed commit of the following:

commit c9bff8b27c6b031d43a7dd98152adcde7f49fff1
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Fri Nov 27 14:08:03 2020 +0300

    dhcpd: try for 5s instead of 10s

commit 983cf471832de0e7762b8b6e0a4ba9bb76ecadfc
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Nov 25 19:58:41 2020 +0300

    dhcpd: wait for interfaces' ip addresses to appear
This commit is contained in:
Ainar Garipov
2020-11-27 14:39:43 +03:00
parent f9e4e7b024
commit a6e18c4700
7 changed files with 365 additions and 172 deletions
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46
internal/dhcpd/v4.go
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@@ -16,7 +16,9 @@ import (
"github.com/insomniacslk/dhcp/dhcpv4/server4"
)
// v4Server - DHCPv4 server
// v4Server is a DHCPv4 server.
//
// TODO(a.garipov): Think about unifying this and v6Server.
type v4Server struct {
srv *server4.Server
leasesLock sync.Mutex
@@ -560,27 +562,6 @@ func (s *v4Server) packetHandler(conn net.PacketConn, peer net.Addr, req *dhcpv4
}
}
// 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 {
@@ -595,26 +576,9 @@ func (s *v4Server) Start() error {
log.Debug("dhcpv4: starting...")
dnsIPAddrs, err := ifaceIPv4Addrs(iface)
dnsIPAddrs, err := ifaceDNSIPAddrs(iface, ipVersion4, defaultMaxAttempts, defaultBackoff)
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.
return fmt.Errorf("dhcpv4: interface %s: %w", ifaceName, err)
}
s.conf.dnsIPAddrs = dnsIPAddrs