mirror of
https://github.com/tailscale/tailscale.git
synced 2024-11-30 05:25:35 +00:00
a5da4ed981
This adds "//go:build" lines and tidies up existing "// +build" lines. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
54 lines
1.4 KiB
Go
54 lines
1.4 KiB
Go
// Copyright (c) 2021 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.
|
|
|
|
//go:build darwin && !ts_macext
|
|
// +build darwin,!ts_macext
|
|
|
|
package netns
|
|
|
|
import (
|
|
"fmt"
|
|
"log"
|
|
"strings"
|
|
"syscall"
|
|
|
|
"golang.org/x/sys/unix"
|
|
"tailscale.com/net/interfaces"
|
|
)
|
|
|
|
// control marks c as necessary to dial in a separate network namespace.
|
|
//
|
|
// It's intentionally the same signature as net.Dialer.Control
|
|
// and net.ListenConfig.Control.
|
|
func control(network, address string, c syscall.RawConn) error {
|
|
if strings.HasPrefix(address, "127.") || address == "::1" {
|
|
// Don't bind to an interface for localhost connections.
|
|
return nil
|
|
}
|
|
idx, err := interfaces.DefaultRouteInterfaceIndex()
|
|
if err != nil {
|
|
log.Printf("netns: DefaultRouteInterfaceIndex: %v", err)
|
|
return nil
|
|
}
|
|
v6 := strings.Contains(address, "]:") || strings.HasSuffix(network, "6") // hacky test for v6
|
|
proto := unix.IPPROTO_IP
|
|
opt := unix.IP_BOUND_IF
|
|
if v6 {
|
|
proto = unix.IPPROTO_IPV6
|
|
opt = unix.IPV6_BOUND_IF
|
|
}
|
|
|
|
var sockErr error
|
|
err = c.Control(func(fd uintptr) {
|
|
sockErr = unix.SetsockoptInt(int(fd), proto, opt, idx)
|
|
})
|
|
if err != nil {
|
|
return fmt.Errorf("RawConn.Control on %T: %w", c, err)
|
|
}
|
|
if sockErr != nil {
|
|
log.Printf("netns: control(%q, %q), v6=%v, index=%v: %v", network, address, v6, idx, sockErr)
|
|
}
|
|
return sockErr
|
|
}
|