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prober: perform DERP bandwidth probes over TUN device to mimic real client

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Updates tailscale/corp#24635

Co-authored-by: Mario Minardi <mario@tailscale.com>
Signed-off-by: Percy Wegmann <percy@tailscale.com>
This commit is contained in:
Percy Wegmann
2024-12-10 11:52:51 -06:00
committed by Percy Wegmann
parent aa04f61d5e
commit 1ed9bd76d6
5 changed files with 411 additions and 28 deletions
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27
cmd/derpprobe/derpprobe.go
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@@ -18,18 +18,19 @@ import (
)
var (
derpMapURL = flag.String("derp-map", "https://login.tailscale.com/derpmap/default", "URL to DERP map (https:// or file://) or 'local' to use the local tailscaled's DERP map")
versionFlag = flag.Bool("version", false, "print version and exit")
listen = flag.String("listen", ":8030", "HTTP listen address")
probeOnce = flag.Bool("once", false, "probe once and print results, then exit; ignores the listen flag")
spread = flag.Bool("spread", true, "whether to spread probing over time")
interval = flag.Duration("interval", 15*time.Second, "probe interval")
meshInterval = flag.Duration("mesh-interval", 15*time.Second, "mesh probe interval")
stunInterval = flag.Duration("stun-interval", 15*time.Second, "STUN probe interval")
tlsInterval = flag.Duration("tls-interval", 15*time.Second, "TLS probe interval")
bwInterval = flag.Duration("bw-interval", 0, "bandwidth probe interval (0 = no bandwidth probing)")
bwSize = flag.Int64("bw-probe-size-bytes", 1_000_000, "bandwidth probe size")
regionCode = flag.String("region-code", "", "probe only this region (e.g. 'lax'); if left blank, all regions will be probed")
derpMapURL = flag.String("derp-map", "https://login.tailscale.com/derpmap/default", "URL to DERP map (https:// or file://) or 'local' to use the local tailscaled's DERP map")
versionFlag = flag.Bool("version", false, "print version and exit")
listen = flag.String("listen", ":8030", "HTTP listen address")
probeOnce = flag.Bool("once", false, "probe once and print results, then exit; ignores the listen flag")
spread = flag.Bool("spread", true, "whether to spread probing over time")
interval = flag.Duration("interval", 15*time.Second, "probe interval")
meshInterval = flag.Duration("mesh-interval", 15*time.Second, "mesh probe interval")
stunInterval = flag.Duration("stun-interval", 15*time.Second, "STUN probe interval")
tlsInterval = flag.Duration("tls-interval", 15*time.Second, "TLS probe interval")
bwInterval = flag.Duration("bw-interval", 0, "bandwidth probe interval (0 = no bandwidth probing)")
bwSize = flag.Int64("bw-probe-size-bytes", 1_000_000, "bandwidth probe size")
bwTUNIPv4Address = flag.String("bw-tun-ipv4-addr", "", "if specified, bandwidth probes will be performed over a TUN device at this address in order to exercise TCP-in-TCP in similar fashion to TCP over Tailscale via DERP. We will use a /30 subnet including this IP address.")
regionCode = flag.String("region-code", "", "probe only this region (e.g. 'lax'); if left blank, all regions will be probed")
)
func main() {
@@ -46,7 +47,7 @@ func main() {
prober.WithTLSProbing(*tlsInterval),
}
if *bwInterval > 0 {
opts = append(opts, prober.WithBandwidthProbing(*bwInterval, *bwSize))
opts = append(opts, prober.WithBandwidthProbing(*bwInterval, *bwSize, *bwTUNIPv4Address))
}
if *regionCode != "" {
opts = append(opts, prober.WithRegion(*regionCode))