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wgengine: make dnsIPsOverTailscale also consider DefaultResolvers

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Found during a failed experiment debugging something on Android.

Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2021-06-24 12:57:26 -07:00
parent 7b8ed1fc09
commit c45bfd4180
1 changed files with 6 additions and 1 deletions
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7
wgengine/userspace.go
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@ -1392,7 +1392,7 @@ func ipInPrefixes(ip netaddr.IP, pp []netaddr.IPPrefix) bool {
func dnsIPsOverTailscale(dnsCfg *dns.Config, routerCfg *router.Config) (ret []netaddr.IPPrefix) {
m := map[netaddr.IP]bool{}
for _, resolvers := range dnsCfg.Routes {
add := func(resolvers []netaddr.IPPort) {
for _, resolver := range resolvers {
ip := resolver.IP()
if ipInPrefixes(ip, routerCfg.Routes) && !ipInPrefixes(ip, routerCfg.LocalRoutes) {
@ -1401,6 +1401,11 @@ func dnsIPsOverTailscale(dnsCfg *dns.Config, routerCfg *router.Config) (ret []ne
}
}
add(dnsCfg.DefaultResolvers)
for _, resolvers := range dnsCfg.Routes {
add(resolvers)
}
ret = make([]netaddr.IPPrefix, 0, len(m))
for ip := range m {
ret = append(ret, netaddr.IPPrefixFrom(ip, ip.BitLen()))