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// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cli
import (
"context"
"errors"
"flag"
"fmt"
"github.com/peterbourgon/ff/v2/ffcli"
"inet.af/netaddr"
"tailscale.com/client/tailscale"
"tailscale.com/ipn/ipnstate"
)
var ipCmd = &ffcli.Command{
Name: "ip",
ShortUsage: "ip [-4] [-6] [peername]",
ShortHelp: "Show current Tailscale IP address(es)",
LongHelp: "Shows the Tailscale IP address of the current machine without an argument. With an argument, it shows the IP of a named peer.",
Exec: runIP,
FlagSet: (func() *flag.FlagSet {
fs := flag.NewFlagSet("ip", flag.ExitOnError)
fs.BoolVar(&ipArgs.want4, "4", false, "only print IPv4 address")
fs.BoolVar(&ipArgs.want6, "6", false, "only print IPv6 address")
return fs
})(),
}
var ipArgs struct {
want4 bool
want6 bool
}
func runIP(ctx context.Context, args []string) error {
if len(args) > 1 {
return errors.New("unknown arguments")
}
var of string
if len(args) == 1 {
of = args[0]
}
v4, v6 := ipArgs.want4, ipArgs.want6
if v4 && v6 {
return errors.New("tailscale up -4 and -6 are mutually exclusive")
}
if !v4 && !v6 {
v4, v6 = true, true
}
st, err := tailscale.Status(ctx)
if err != nil {
return err
}
ips := st.TailscaleIPs
if of != "" {
ip, err := tailscaleIPFromArg(ctx, of)
if err != nil {
return err
}
peer, ok := peerMatchingIP(st, ip)
if !ok {
return fmt.Errorf("no peer found with IP %v", ip)
}
ips = peer.TailscaleIPs
}
if len(ips) == 0 {
return fmt.Errorf("no current Tailscale IPs; state: %v", st.BackendState)
}
match := false
for _, ip := range ips {
if ip.Is4() && v4 || ip.Is6() && v6 {
match = true
fmt.Println(ip)
}
}
if !match {
if ipArgs.want4 {
return errors.New("no Tailscale IPv4 address")
}
if ipArgs.want6 {
return errors.New("no Tailscale IPv6 address")
}
}
return nil
}
func peerMatchingIP(st *ipnstate.Status, ipStr string) (ps *ipnstate.PeerStatus, ok bool) {
ip, err := netaddr.ParseIP(ipStr)
if err != nil {
return
}
for _, ps = range st.Peer {
for _, pip := range ps.TailscaleIPs {
if ip == pip {
return ps, true
}
}
}
return nil, false
}
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