mirror of
https://github.com/tailscale/tailscale.git
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74 lines
1.9 KiB
Go
74 lines
1.9 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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"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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DERP: derpmap.Prod(),
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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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report, err := c.GetReport(ctx)
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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.DERPLatency) == 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, c.DERP.LocationOfID(report.PreferredDERP))
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fmt.Printf("\t* DERP latency:\n")
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var ss []string
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for s := range report.DERPLatency {
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ss = append(ss, s)
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}
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sort.Strings(ss)
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for _, s := range ss {
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fmt.Printf("\t\t- %s = %v\n", s, report.DERPLatency[s])
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}
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}
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return nil
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}
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