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wgengine/magicsock: add a test for active path discovery.

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Uses natlab only, because the point of this active discovery test is going to be
that it should get through a lot of obstacles.

Signed-off-by: David Anderson <danderson@tailscale.com>
This commit is contained in:
David Anderson
2020-07-25 00:32:18 +00:00
committed by Dave Anderson
parent a2b4ad839b
commit f582eeabd1
2 changed files with 218 additions and 20 deletions
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57
wgengine/magicsock/magicsock.go
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@@ -55,6 +55,44 @@ import (
"tailscale.com/version"
)
// Various debugging and experimental tweakables, set by environment
// variable.
var (
// logPacketDests prints the known addresses for a peer every time
// they change, in the legacy (non-discovery) endpoint code only.
logPacketDests, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_LOG_PACKET_DESTS"))
// debugDisco prints verbose logs of active discovery events as
// they happen.
debugDisco, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DISCO"))
// debugOmitLocalAddresses removes all local interface addresses
// from magicsock's discovered local endpoints. Used in some tests.
debugOmitLocalAddresses, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_OMIT_LOCAL_ADDRS"))
// debugUseDerpRoute temporarily (2020-03-22) controls whether DERP
// reverse routing is enabled (Issue 150). It will become always true
// later.
debugUseDerpRoute, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_ENABLE_DERP_ROUTE"))
// logDerpVerbose logs all received DERP packets, including their
// full payload.
logDerpVerbose, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DERP"))
// debugReSTUNStopOnIdle unconditionally enables the "shut down
// STUN if magicsock is idle" behavior that normally only triggers
// on mobile devices, lowers the shutdown interval, and logs more
// verbosely about idle measurements.
debugReSTUNStopOnIdle, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_RESTUN_STOP_ON_IDLE"))
)
// inTest binds magicsock to 127.0.0.1 instead of its usual 0.0.0.0,
// to avoid macOS prompting for firewall permissions during
// interactive tests.
//
// Unlike the other debug tweakables above, this one needs to be
// checked every time at runtime, because tests set this after program
// startup.
func inTest() bool {
inTest, _ := strconv.ParseBool(os.Getenv("IN_TS_TEST"))
return inTest
}
// A Conn routes UDP packets and actively manages a list of its endpoints.
// It implements wireguard/conn.Bind.
type Conn struct {
@@ -602,8 +640,6 @@ func (c *Conn) goDerpConnect(node int) {
go c.derpWriteChanOfAddr(netaddr.IPPort{IP: derpMagicIPAddr, Port: uint16(node)}, key.Public{})
}
var debugOmitLocalAddresses, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_OMIT_LOCAL_ADDRS"))
// determineEndpoints returns the machine's endpoint addresses. It
// does a STUN lookup (via netcheck) to determine its public address.
//
@@ -705,10 +741,6 @@ func shouldSprayPacket(b []byte) bool {
return false
}
var logPacketDests, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_LOG_PACKET_DESTS"))
var debugDisco, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_DISCO"))
const sprayPeriod = 3 * time.Second
// appendDests appends to dsts the destinations that b should be
@@ -933,11 +965,6 @@ func (c *Conn) sendAddr(addr netaddr.IPPort, pubKey key.Public, b []byte) (sent
// TODO: this is currently arbitrary. Figure out something better?
const bufferedDerpWritesBeforeDrop = 32
// debugUseDerpRoute temporarily (2020-03-22) controls whether DERP
// reverse routing is enabled (Issue 150). It will become always true
// later.
var debugUseDerpRoute, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_ENABLE_DERP_ROUTE"))
// derpWriteChanOfAddr returns a DERP client for fake UDP addresses that
// represent DERP servers, creating them as necessary. For real UDP
// addresses, it returns nil.
@@ -1113,8 +1140,6 @@ type derpReadResult struct {
copyBuf func(dst []byte) int
}
var logDerpVerbose, _ = strconv.ParseBool(os.Getenv("DEBUG_DERP_VERBOSE"))
// runDerpReader runs in a goroutine for the life of a DERP
// connection, handling received packets.
func (c *Conn) runDerpReader(ctx context.Context, derpFakeAddr netaddr.IPPort, dc *derphttp.Client, wg *syncs.WaitGroupChan, startGate <-chan struct{}) {
@@ -2070,8 +2095,6 @@ func (c *Conn) Close() error {
return err
}
var debugReSTUNStopOnIdle, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_RESTUN_STOP_ON_IDLE"))
func maxIdleBeforeSTUNShutdown() time.Duration {
if debugReSTUNStopOnIdle {
return time.Minute
@@ -2197,7 +2220,7 @@ func (c *Conn) listenPacket(ctx context.Context, network, addr string) (net.Pack
func (c *Conn) bind1(ruc **RebindingUDPConn, which string) error {
host := ""
if v, _ := strconv.ParseBool(os.Getenv("IN_TS_TEST")); v {
if inTest() {
host = "127.0.0.1"
}
var pc net.PacketConn
@@ -2227,7 +2250,7 @@ func (c *Conn) bind1(ruc **RebindingUDPConn, which string) error {
// It should be followed by a call to ReSTUN.
func (c *Conn) Rebind() {
host := ""
if v, _ := strconv.ParseBool(os.Getenv("IN_TS_TEST")); v {
if inTest() {
host = "127.0.0.1"
}
listenCtx := context.Background() // unused without DNS name to resolve