Feature/add iOS support (#1244)

* starting engine by passing file descriptor on engine start * inject logger that does not compile * logger and first client * first working connection * support for routes and working connection * small refactor for better code quality in swift * trying to add DNS * fix * updated * fix route deletion * trying to bind the DNS resolver dialer to an interface * use dns.Client.Exchange * fix metadata send on startup * switching between client to query upstream * fix panic on no dns response * fix after merge changes * add engine ready listener * replace engine listener with connection listener * disable relay connection for iOS until proxy is refactored into bind * Extract private upstream for iOS and fix function headers for other OS * Update mock Server * Fix dns server and upstream tests * Fix engine null pointer with mobile dependencies for other OS * Revert back to disabling upstream on no response * Fix some of the remarks from the linter * Fix linter * re-arrange duration calculation * revert exported HostDNSConfig * remove unused engine listener * remove development logs * refactor dns code and interface name propagation * clean dns server test * disable upstream deactivation for iOS * remove files after merge * fix dns server darwin * fix server mock * fix build flags * move service listen back to initialize * add wgInterface to hostManager initialization on android * fix typo and remove unused function * extract upstream exchange for ios and rest * remove todo * separate upstream logic to ios file * Fix upstream test * use interface and embedded struct for upstream * set properly upstream client * remove placeholder * remove ios specific attributes * fix upstream test * merge ipc parser and wg configurer for mobile * fix build annotation * use json for DNS settings handover through gomobile * add logs for DNS json string * bring back check on ios for private upstream * remove wrong (and unused) line * fix wrongly updated comments on DNSSetting export --------- Co-authored-by: Maycon Santos <mlsmaycon@gmail.com>
2026-04-18 16:26:38 +00:00 · 2023-12-18 11:46:58 +01:00
parent 01f28baec7
commit 818c6b885f
52 changed files with 1377 additions and 188 deletions
--- a/client/internal/dns/upstream_ios.go
+++ b/client/internal/dns/upstream_ios.go
@@ -0,0 +1,93 @@
+//go:build ios
+
+package dns
+
+import (
+	"context"
+	"net"
+	"syscall"
+	"time"
+
+	"github.com/miekg/dns"
+	log "github.com/sirupsen/logrus"
+	"golang.org/x/sys/unix"
+)
+
+type upstreamResolverIOS struct {
+	*upstreamResolverBase
+	lIP    net.IP
+	lNet   *net.IPNet
+	iIndex int
+}
+
+func newUpstreamResolver(parentCTX context.Context, interfaceName string, ip net.IP, net *net.IPNet) (*upstreamResolverIOS, error) {
+	upstreamResolverBase := newUpstreamResolverBase(parentCTX)
+
+	index, err := getInterfaceIndex(interfaceName)
+	if err != nil {
+		log.Debugf("unable to get interface index for %s: %s", interfaceName, err)
+		return nil, err
+	}
+
+	ios := &upstreamResolverIOS{
+		upstreamResolverBase: upstreamResolverBase,
+		lIP:                  ip,
+		lNet:                 net,
+		iIndex:               index,
+	}
+	ios.upstreamClient = ios
+
+	return ios, nil
+}
+
+func (u *upstreamResolverIOS) exchange(upstream string, r *dns.Msg) (rm *dns.Msg, t time.Duration, err error) {
+	client := &dns.Client{}
+	upstreamHost, _, err := net.SplitHostPort(upstream)
+	if err != nil {
+		log.Errorf("error while parsing upstream host: %s", err)
+	}
+	upstreamIP := net.ParseIP(upstreamHost)
+	if u.lNet.Contains(upstreamIP) || net.IP.IsPrivate(upstreamIP) {
+		log.Debugf("using private client to query upstream: %s", upstream)
+		client = u.getClientPrivate()
+	}
+
+	return client.Exchange(r, upstream)
+}
+
+// getClientPrivate returns a new DNS client bound to the local IP address of the Netbird interface
+// This method is needed for iOS
+func (u *upstreamResolverIOS) getClientPrivate() *dns.Client {
+	dialer := &net.Dialer{
+		LocalAddr: &net.UDPAddr{
+			IP:   u.lIP,
+			Port: 0, // Let the OS pick a free port
+		},
+		Timeout: upstreamTimeout,
+		Control: func(network, address string, c syscall.RawConn) error {
+			var operr error
+			fn := func(s uintptr) {
+				operr = unix.SetsockoptInt(int(s), unix.IPPROTO_IP, unix.IP_BOUND_IF, u.iIndex)
+			}
+
+			if err := c.Control(fn); err != nil {
+				return err
+			}
+
+			if operr != nil {
+				log.Errorf("error while setting socket option: %s", operr)
+			}
+
+			return operr
+		},
+	}
+	client := &dns.Client{
+		Dialer: dialer,
+	}
+	return client
+}
+
+func getInterfaceIndex(interfaceName string) (int, error) {
+	iface, err := net.InterfaceByName(interfaceName)
+	return iface.Index, err
+}