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ipn/ipnlocal, net/dnscache: allow configuring dnscache logging via capability

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This allows users to temporarily enable/disable dnscache logging via a
new node capability, to aid in debugging strange connectivity issues.

Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I46cf2596a8ae4c1913880a78d0033f8b668edc08
This commit is contained in:
Andrew Dunham
2023-01-24 14:31:20 -05:00
parent d8feeeee4c
commit 44d73ce932
4 changed files with 89 additions and 39 deletions
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15
ipn/ipnlocal/local.go
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@@ -45,6 +45,7 @@ import (
"tailscale.com/ipn/ipnstate"
"tailscale.com/ipn/policy"
"tailscale.com/net/dns"
"tailscale.com/net/dnscache"
"tailscale.com/net/dnsfallback"
"tailscale.com/net/interfaces"
"tailscale.com/net/netutil"
@@ -3820,6 +3821,8 @@ func (b *LocalBackend) setNetMapLocked(nm *netmap.NetworkMap) {
}
b.capFileSharing = fs
b.setDebugLogsByCapabilityLocked(nm)
b.setTCPPortsInterceptedFromNetmapAndPrefsLocked(b.pm.CurrentPrefs())
if nm == nil {
b.nodeByAddr = nil
@@ -3855,6 +3858,18 @@ func (b *LocalBackend) setNetMapLocked(nm *netmap.NetworkMap) {
}
}
// setDebugLogsByCapabilityLocked sets debug logging based on the self node's
// capabilities in the provided NetMap.
func (b *LocalBackend) setDebugLogsByCapabilityLocked(nm *netmap.NetworkMap) {
// These are sufficiently cheap (atomic bools) that we don't need to
// store state and compare.
if hasCapability(nm, tailcfg.CapabilityDebugTSDNSResolution) {
dnscache.SetDebugLoggingEnabled(true)
} else {
dnscache.SetDebugLoggingEnabled(false)
}
}
func (b *LocalBackend) reloadServeConfigLocked(prefs ipn.PrefsView) {
if b.netMap == nil || b.netMap.SelfNode == nil || !prefs.Valid() || b.pm.CurrentProfile().ID == "" {
// We're not logged in, so we don't have a profile.