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tsdns: initial implementation of a Tailscale DNS resolver (#396)

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Signed-off-by: Dmytro Shynkevych <dmytro@tailscale.com>
This commit is contained in:
Dmytro Shynkevych
2020-06-08 18:19:26 -04:00
committed by GitHub
parent 5e1ee4be53
commit 511840b1f6
12 changed files with 583 additions and 109 deletions
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31
ipn/local.go
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@@ -26,6 +26,7 @@ import (
"tailscale.com/wgengine"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/router"
"tailscale.com/wgengine/tsdns"
)
// LocalBackend is the glue between the major pieces of the Tailscale
@@ -311,6 +312,7 @@ func (b *LocalBackend) Start(opts Options) error {
b.send(Notify{NetMap: newSt.NetMap})
b.updateFilter(newSt.NetMap)
b.updateDNSMap(newSt.NetMap)
if disableDERP {
b.e.SetDERPMap(nil)
} else {
@@ -427,6 +429,27 @@ func (b *LocalBackend) updateFilter(netMap *controlclient.NetworkMap) {
b.e.SetFilter(filter.New(netMap.PacketFilter, localNets, b.e.GetFilter(), b.logf))
}
// updateDNSMap updates the domain map in the DNS resolver in wgengine
// based on the given netMap and user preferences.
func (b *LocalBackend) updateDNSMap(netMap *controlclient.NetworkMap) {
if netMap == nil {
return
}
dnsMap := &tsdns.Map{DomainToIP: make(map[string]netaddr.IP)}
for _, peer := range netMap.Peers {
if len(peer.Addresses) == 0 {
continue
}
domain := peer.Hostinfo.Hostname
// Like PeerStatus.SimpleHostName()
domain = strings.TrimSuffix(domain, ".local")
domain = strings.TrimSuffix(domain, ".localdomain")
domain = domain + ".ipn.dev"
dnsMap.DomainToIP[domain] = netaddr.IPFrom16(peer.Addresses[0].IP.Addr)
}
b.e.SetDNSMap(dnsMap)
}
// readPoller is a goroutine that receives service lists from
// b.portpoll and propagates them into the controlclient's HostInfo.
func (b *LocalBackend) readPoller() {
@@ -667,6 +690,7 @@ func (b *LocalBackend) SetPrefs(new *Prefs) {
}
b.updateFilter(b.netMapCache)
b.updateDNSMap(b.netMapCache)
if old.WantRunning != new.WantRunning {
b.stateMachine()
@@ -799,6 +823,13 @@ func routerConfig(cfg *wgcfg.Config, prefs *Prefs, dnsDomains []string) *router.
rs.Routes = append(rs.Routes, wgCIDRToNetaddr(peer.AllowedIPs)...)
}
// The Tailscale DNS IP.
// TODO(dmytro): make this configurable.
rs.Routes = append(rs.Routes, netaddr.IPPrefix{
IP: netaddr.IPv4(100, 100, 100, 100),
Bits: 32,
})
return rs
}