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wgengine: add Engine.SetLinkChangeCallback

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Start of making the IPN state machine react to link changes and down
its DNS & routes if necessary to unblock proxy resolution (e.g. for
transitioning from public to corp networks where the corp network has
mandatory proxies and WPAD PAC files that can't be resolved while
using the DNS/routes configured previously)

This change should be a no-op. Just some callback plumbing.
This commit is contained in:
Brad Fitzpatrick
2020-08-27 21:25:17 -07:00
parent bd37e40d2b
commit 9b07517f18
4 changed files with 43 additions and 11 deletions
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5
wgengine/wgengine.go
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@ -12,6 +12,7 @@ import (
"inet.af/netaddr"
"tailscale.com/control/controlclient"
"tailscale.com/ipn/ipnstate"
"tailscale.com/net/interfaces"
"tailscale.com/tailcfg"
"tailscale.com/wgengine/filter"
"tailscale.com/wgengine/router"
@ -117,6 +118,10 @@ type Engine interface {
// new NetInfo summary is available.
SetNetInfoCallback(NetInfoCallback)
// SetLinkChangeCallback sets the function to call when the
// link state changes.
SetLinkChangeCallback(func(major bool, newState *interfaces.State))
// DiscoPublicKey gets the public key used for path discovery
// messages.
DiscoPublicKey() tailcfg.DiscoKey