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e6b84f2159
Instead of hard-coding the DERP map (except for cmd/tailscale netcheck for now), get it from the control server at runtime. And make the DERP map support multiple nodes per region with clients picking the first one that's available. (The server will balance the order presented to clients for load balancing) This deletes the stunner package, merging it into the netcheck package instead, to minimize all the config hooks that would've been required. Also fix some test flakes & races. Fixes #387 (Don't hard-code the DERP map) Updates #388 (Add DERP region support) Fixes #399 (wgengine: flaky tests) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
80 lines
2.1 KiB
Go
80 lines
2.1 KiB
Go
// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"context"
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"fmt"
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"log"
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"sort"
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"time"
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"github.com/peterbourgon/ff/v2/ffcli"
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"tailscale.com/derp/derpmap"
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"tailscale.com/net/dnscache"
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"tailscale.com/netcheck"
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"tailscale.com/types/logger"
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)
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var netcheckCmd = &ffcli.Command{
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Name: "netcheck",
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ShortUsage: "netcheck",
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ShortHelp: "Print an analysis of local network conditions",
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Exec: runNetcheck,
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}
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func runNetcheck(ctx context.Context, args []string) error {
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c := &netcheck.Client{
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Logf: logger.WithPrefix(log.Printf, "netcheck: "),
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DNSCache: dnscache.Get(),
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}
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dm := derpmap.Prod()
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report, err := c.GetReport(ctx, dm)
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if err != nil {
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log.Fatalf("netcheck: %v", err)
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}
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fmt.Printf("\nReport:\n")
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fmt.Printf("\t* UDP: %v\n", report.UDP)
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if report.GlobalV4 != "" {
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fmt.Printf("\t* IPv4: yes, %v\n", report.GlobalV4)
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} else {
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fmt.Printf("\t* IPv4: (no addr found)\n")
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}
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if report.GlobalV6 != "" {
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fmt.Printf("\t* IPv6: yes, %v\n", report.GlobalV6)
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} else if report.IPv6 {
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fmt.Printf("\t* IPv6: (no addr found)\n")
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} else {
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fmt.Printf("\t* IPv6: no\n")
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}
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fmt.Printf("\t* MappingVariesByDestIP: %v\n", report.MappingVariesByDestIP)
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fmt.Printf("\t* HairPinning: %v\n", report.HairPinning)
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// When DERP latency checking failed,
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// magicsock will try to pick the DERP server that
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// most of your other nodes are also using
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if len(report.RegionLatency) == 0 {
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fmt.Printf("\t* Nearest DERP: unknown (no response to latency probes)\n")
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} else {
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fmt.Printf("\t* Nearest DERP: %v (%v)\n", report.PreferredDERP, dm.Regions[report.PreferredDERP].RegionCode)
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fmt.Printf("\t* DERP latency:\n")
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var rids []int
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for rid := range dm.Regions {
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rids = append(rids, rid)
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}
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sort.Ints(rids)
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for _, rid := range rids {
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d, ok := report.RegionLatency[rid]
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var latency string
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if ok {
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latency = d.Round(time.Millisecond / 10).String()
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}
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fmt.Printf("\t\t- %v, %3s = %s\n", rid, dm.Regions[rid].RegionCode, latency)
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}
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}
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return nil
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}
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