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// Copyright (c) Tailscale Inc & contributors
// SPDX-License-Identifier: BSD-3-Clause
package main
import (
"context"
"errors"
"fmt"
"log"
"net"
"strings"
"tailscale.com/derp"
"tailscale.com/derp/derphttp"
"tailscale.com/derp/derpserver"
"tailscale.com/net/netmon"
"tailscale.com/types/logger"
)
func startMesh(s *derpserver.Server) error {
if *meshWith == "" {
return nil
}
if !s.HasMeshKey() {
return errors.New("--mesh-with requires --mesh-psk-file")
}
for hostTuple := range strings.SplitSeq(*meshWith, ",") {
if err := startMeshWithHost(s, hostTuple); err != nil {
return err
}
}
return nil
}
func startMeshWithHost(s *derpserver.Server, hostTuple string) error {
var host string
var dialHost string
hostParts := strings.Split(hostTuple, "/")
if len(hostParts) > 2 {
return fmt.Errorf("too many components in host tuple %q", hostTuple)
}
host = hostParts[0]
if len(hostParts) == 2 {
dialHost = hostParts[1]
} else {
dialHost = hostParts[0]
}
logf := logger.WithPrefix(log.Printf, fmt.Sprintf("mesh(%q): ", host))
netMon := netmon.NewStatic() // good enough for cmd/derper; no need for netns fanciness
c, err := derphttp.NewClient(s.PrivateKey(), "https://"+host+"/derp", logf, netMon)
if err != nil {
return err
}
c.MeshKey = s.MeshKey()
c.WatchConnectionChanges = true
logf("will dial %q for %q", dialHost, host)
if dialHost != host {
var d net.Dialer
c.SetURLDialer(func(ctx context.Context, network, addr string) (net.Conn, error) {
_, port, err := net.SplitHostPort(addr)
if err != nil {
logf("failed to split %q: %v", addr, err)
return nil, err
}
dialAddr := net.JoinHostPort(dialHost, port)
logf("dialing %q instead of %q", dialAddr, addr)
return d.DialContext(ctx, network, dialAddr)
})
}
add := func(m derp.PeerPresentMessage) { s.AddPacketForwarder(m.Key, c) }
remove := func(m derp.PeerGoneMessage) { s.RemovePacketForwarder(m.Peer, c) }
notifyError := func(err error) {}
go c.RunWatchConnectionLoop(context.Background(), s.PublicKey(), logf, add, remove, notifyError)
return nil
}
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