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net/dns: add GetBaseConfig to CallbackRouter.

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Allow users of CallbackRouter to supply a GetBaseConfig
implementation. This is expected to be used on Android,
which currently lacks both a) platform support for
Split-DNS and b) a way to retrieve the current DNS
servers.

iOS/macOS also use the CallbackRouter but have platform
support for SplitDNS, so don't need getBaseConfig.

Updates https://github.com/tailscale/tailscale/issues/2116
Updates https://github.com/tailscale/tailscale/issues/988

Signed-off-by: Denton Gentry <dgentry@tailscale.com>
This commit is contained in:
Denton Gentry
2021-10-09 12:17:59 -07:00
committed by Denton Gentry
parent a28d280b95
commit 878a20df29
4 changed files with 17 additions and 31 deletions
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3
ipn/ipnlocal/local.go
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@@ -2091,9 +2091,6 @@ func dnsConfigForNetmap(nm *netmap.NetworkMap, prefs *ipn.Prefs, logf logger.Log
addDefault(nm.DNS.FallbackResolvers)
case len(dcfg.Routes) == 0:
// No settings requiring split DNS, no problem.
case versionOS == "android":
// We don't support split DNS at all on Android yet.
addDefault(nm.DNS.FallbackResolvers)
}
return dcfg