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net/dns: set OS DNS to 100.100.100.100 for route-less ExtraRecords [cap 41]

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If ExtraRecords (Hosts) are specified without a corresponding split
DNS route and global DNS is specified, then program the host OS DNS to
use 100.100.100.100 so it can blend in those ExtraRecords.

Updates #1543

Change-Id: If49014a5ecc8e38978ff26e54d1f74fe8dbbb9bc
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2022-08-30 09:34:59 -07:00
committed by Brad Fitzpatrick
parent 27f36f77c3
commit 9f6c8517e0
4 changed files with 99 additions and 4 deletions
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3
tailcfg/tailcfg.go
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@@ -77,7 +77,8 @@ type CapabilityVersion int
// 38: 2022-08-11: added PingRequest.URLIsNoise
// 39: 2022-08-15: clients can talk Noise over arbitrary HTTPS port
// 40: 2022-08-22: added Node.KeySignature, PeersChangedPatch.KeySignature
const CurrentCapabilityVersion CapabilityVersion = 40
// 41: 2022-08-30: uses 100.100.100.100 for route-less ExtraRecords if global nameservers is set
const CurrentCapabilityVersion CapabilityVersion = 41
type StableID string