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derp,magicsock: add debug envknobs for HTTP and derp server name (#7744)

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Make developing derp easier by:

1. Creating an envknob telling clients to use HTTP to connect to derp
servers, so devs don't have to acquire a valid TLS cert.

2. Creating an envknob telling clients which derp server to connect
to, so devs don't have to edit the ACLs in the admin console to add a
custom DERP map.

3. Explaining how the -dev and -a command lines args to derper
interact.

To use this:

1. Run derper with -dev.

2. Run tailscaled with TS_DEBUG_USE_DERP_HTTP=1 and
TS_DEBUG_USE_DERP_ADDR=localhost

This will result in the client connecting to derp via HTTP on port
3340.

Fixes #7700

Signed-off-by: Val <valerie@tailscale.com>
This commit is contained in:
valscale
2023-04-04 17:10:50 -07:00
committed by GitHub
parent f475e5550c
commit 7bfb7744b7
5 changed files with 49 additions and 6 deletions
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12
wgengine/magicsock/debugknobs.go
View File

@@ -33,13 +33,19 @@ var (
debugReSTUNStopOnIdle = envknob.RegisterBool("TS_DEBUG_RESTUN_STOP_ON_IDLE")
// debugAlwaysDERP disables the use of UDP, forcing all peer communication over DERP.
debugAlwaysDERP = envknob.RegisterBool("TS_DEBUG_ALWAYS_USE_DERP")
// debugDERPAddr sets the derp address manually, overriding the DERP map from control.
debugUseDERPAddr = envknob.RegisterString("TS_DEBUG_USE_DERP_ADDR")
// debugDERPUseHTTP tells clients to connect to DERP via HTTP on port 3340 instead of
// HTTPS on 443.
debugUseDERPHTTP = envknob.RegisterBool("TS_DEBUG_USE_DERP_HTTP")
// debugEnableSilentDisco disables the use of heartbeatTimer on the endpoint struct
// and attempts to handle disco silently. See issue #540 for details.
debugEnableSilentDisco = envknob.RegisterBool("TS_DEBUG_ENABLE_SILENT_DISCO")
// DebugSendCallMeUnknownPeer sends a CallMeMaybe to a
// non-existent destination every time we send a real
// CallMeMaybe to test the PeerGoneNotHere logic.
// debugSendCallMeUnknownPeer sends a CallMeMaybe to a non-existent destination every
// time we send a real CallMeMaybe to test the PeerGoneNotHere logic.
debugSendCallMeUnknownPeer = envknob.RegisterBool("TS_DEBUG_SEND_CALLME_UNKNOWN_PEER")
// Hey you! Adding a new debugknob? Make sure to stub it out in the debugknob_stubs.go
// file too.
)
// inTest reports whether the running program is a test that set the