mirror of
https://github.com/netbirdio/netbird.git
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c590518e0c
Support exit node on Android. With the protect socket function, we mark every connection that should be used out of VPN.
111 lines
2.6 KiB
Go
111 lines
2.6 KiB
Go
//go:build ios
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package dns
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import (
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"context"
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"net"
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"syscall"
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"time"
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"github.com/miekg/dns"
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log "github.com/sirupsen/logrus"
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"golang.org/x/sys/unix"
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"github.com/netbirdio/netbird/client/internal/peer"
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)
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type upstreamResolverIOS struct {
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*upstreamResolverBase
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lIP net.IP
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lNet *net.IPNet
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iIndex int
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}
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func newUpstreamResolver(
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ctx context.Context,
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interfaceName string,
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ip net.IP,
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net *net.IPNet,
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statusRecorder *peer.Status,
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_ *hostsDNSHolder,
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) (*upstreamResolverIOS, error) {
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upstreamResolverBase := newUpstreamResolverBase(ctx, statusRecorder)
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index, err := getInterfaceIndex(interfaceName)
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if err != nil {
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log.Debugf("unable to get interface index for %s: %s", interfaceName, err)
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return nil, err
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}
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ios := &upstreamResolverIOS{
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upstreamResolverBase: upstreamResolverBase,
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lIP: ip,
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lNet: net,
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iIndex: index,
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}
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ios.upstreamClient = ios
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return ios, nil
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}
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func (u *upstreamResolverIOS) exchange(ctx context.Context, upstream string, r *dns.Msg) (rm *dns.Msg, t time.Duration, err error) {
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client := &dns.Client{}
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upstreamHost, _, err := net.SplitHostPort(upstream)
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if err != nil {
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log.Errorf("error while parsing upstream host: %s", err)
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}
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timeout := upstreamTimeout
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if deadline, ok := ctx.Deadline(); ok {
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timeout = time.Until(deadline)
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}
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client.DialTimeout = timeout
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upstreamIP := net.ParseIP(upstreamHost)
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if u.lNet.Contains(upstreamIP) || net.IP.IsPrivate(upstreamIP) {
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log.Debugf("using private client to query upstream: %s", upstream)
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client = u.getClientPrivate(timeout)
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}
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// Cannot use client.ExchangeContext because it overwrites our Dialer
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return client.Exchange(r, upstream)
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}
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// getClientPrivate returns a new DNS client bound to the local IP address of the Netbird interface
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// This method is needed for iOS
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func (u *upstreamResolverIOS) getClientPrivate(dialTimeout time.Duration) *dns.Client {
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dialer := &net.Dialer{
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LocalAddr: &net.UDPAddr{
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IP: u.lIP,
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Port: 0, // Let the OS pick a free port
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},
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Timeout: dialTimeout,
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Control: func(network, address string, c syscall.RawConn) error {
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var operr error
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fn := func(s uintptr) {
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operr = unix.SetsockoptInt(int(s), unix.IPPROTO_IP, unix.IP_BOUND_IF, u.iIndex)
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}
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if err := c.Control(fn); err != nil {
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return err
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}
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if operr != nil {
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log.Errorf("error while setting socket option: %s", operr)
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}
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return operr
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},
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}
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client := &dns.Client{
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Dialer: dialer,
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}
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return client
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}
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func getInterfaceIndex(interfaceName string) (int, error) {
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iface, err := net.InterfaceByName(interfaceName)
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return iface.Index, err
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}
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