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wgengine/magicsock: add debug envknob for injecting an endpoint

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For testing. Lee wants to play with 'AWS Global Accelerator Custom
Routing with Amazon Elastic Kubernetes Service'. If this works well
enough, we can promote it.

Updates #12578

Change-Id: I5018347ed46c15c9709910717d27305d0aedf8f4
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick
2024-07-08 07:21:21 -07:00
committed by Brad Fitzpatrick
parent d2fef01206
commit 42dac7c5c2
4 changed files with 34 additions and 1 deletions
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19
wgengine/magicsock/debugknobs.go
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@@ -6,6 +6,10 @@
package magicsock
import (
"log"
"net/netip"
"sync"
"tailscale.com/envknob"
)
@@ -68,3 +72,18 @@ var (
// checked every time at runtime, because tests set this after program
// startup.
func inTest() bool { return envknob.Bool("IN_TS_TEST") }
// pretendpoint returns TS_DEBUG_PRETENDPOINT as an AddrPort, if set.
// See https://github.com/tailscale/tailscale/issues/12578 and
// https://github.com/tailscale/tailscale/pull/12735.
var pretendpoint = sync.OnceValue(func() (ap netip.AddrPort) {
s := envknob.String("TS_DEBUG_PRETENDPOINT")
if s == "" {
return
}
ap, err := netip.ParseAddrPort(s)
if err != nil {
log.Printf("ignoring invalid TS_DEBUG_PRETENDPOINT %q: %v", s, err)
}
return ap
})