Feature/outline glue (#106)

* feat: added outline integration layer

* chore: make the function used in RegisterFallbackParser a standalone one

* fix: check if domain has a dot prior trimming it

* fix: use net.JoinHostPort instead of plain concat

outline/dialer.go

@@ -0,0 +1,77 @@
+package outline
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"net/netip"
+
+	"github.com/Jigsaw-Code/outline-sdk/transport"
+	"github.com/amnezia-vpn/amneziawg-go/conn"
+	"github.com/amnezia-vpn/amneziawg-go/device"
+	"github.com/amnezia-vpn/amneziawg-go/tun/netstack"
+	"gvisor.dev/gvisor/pkg/tcpip/adapters/gonet"
+)
+
+type DialerOptions struct {
+	Ipc      string
+	Prefixes []netip.Prefix
+	Mtu      int
+	Dns      []netip.Addr
+}
+
+func NewStreamDialer(opts DialerOptions) (*StreamDialer, error) {
+	var localAddresses []netip.Addr
+	for _, prefix := range opts.Prefixes {
+		localAddresses = append(localAddresses, prefix.Addr())
+	}
+
+	tun, tnet, err := netstack.CreateNetTUN(localAddresses, opts.Dns, opts.Mtu)
+	if err != nil {
+		return nil, fmt.Errorf("failed to create network tun: %v", err)
+	}
+
+	awgLogger := device.Logger{
+		Verbosef: func(format string, args ...any) {
+		},
+		Errorf: func(format string, args ...any) {
+		},
+	}
+
+	dev := device.NewDevice(tun, conn.NewDefaultBind(), &awgLogger)
+	if err := dev.IpcSet(opts.Ipc); err != nil {
+		return nil, fmt.Errorf("failed to configure device: %v", err)
+	}
+
+	if err := dev.Up(); err != nil {
+		return nil, fmt.Errorf("failed to start awg device: %v", err)
+	}
+
+	return &StreamDialer{
+		tnet: tnet,
+	}, nil
+}
+
+var _ transport.StreamDialer = (*StreamDialer)(nil)
+
+type StreamDialer struct {
+	tnet *netstack.Net
+}
+
+func (d *StreamDialer) DialStream(ctx context.Context, raddr string) (transport.StreamConn, error) {
+	host, port, err := net.SplitHostPort(raddr)
+	if err != nil {
+		return nil, fmt.Errorf("failed to parse raddr: %v", err)
+	}
+	if l := len(host); l > 0 && host[l-1] == '.' {
+		host = host[:l-1]
+		raddr = net.JoinHostPort(host, port)
+	}
+
+	conn, err := d.tnet.DialContext(ctx, "tcp", raddr)
+	if err != nil {
+		return nil, err
+	}
+
+	return conn.(*gonet.TCPConn), nil
+}