TUN-528: Move cloudflared into a separate repo

vendor/github.com/miekg/dns/udp_test.go

@@ -0,0 +1,140 @@
+// +build linux,!appengine
+
+package dns
+
+import (
+	"bytes"
+	"net"
+	"runtime"
+	"strings"
+	"testing"
+	"time"
+
+	"golang.org/x/net/ipv4"
+	"golang.org/x/net/ipv6"
+)
+
+func TestSetUDPSocketOptions(t *testing.T) {
+	// returns an error if we cannot resolve that address
+	testFamily := func(n, addr string) error {
+		a, err := net.ResolveUDPAddr(n, addr)
+		if err != nil {
+			return err
+		}
+		c, err := net.ListenUDP(n, a)
+		if err != nil {
+			return err
+		}
+		if err := setUDPSocketOptions(c); err != nil {
+			t.Fatalf("failed to set socket options: %v", err)
+		}
+		ch := make(chan *SessionUDP)
+		go func() {
+			// Set some deadline so this goroutine doesn't hang forever
+			c.SetReadDeadline(time.Now().Add(time.Minute))
+			b := make([]byte, 1)
+			_, sess, err := ReadFromSessionUDP(c, b)
+			if err != nil {
+				t.Fatalf("failed to read from conn: %v", err)
+			}
+			ch <- sess
+		}()
+
+		c2, err := net.Dial("udp", c.LocalAddr().String())
+		if err != nil {
+			t.Fatalf("failed to dial udp: %v", err)
+		}
+		if _, err := c2.Write([]byte{1}); err != nil {
+			t.Fatalf("failed to write to conn: %v", err)
+		}
+		sess := <-ch
+		if len(sess.context) == 0 {
+			t.Fatalf("empty session context: %v", sess)
+		}
+		ip := parseDstFromOOB(sess.context)
+		if ip == nil {
+			t.Fatalf("failed to parse dst: %v", sess)
+		}
+		if !strings.Contains(c.LocalAddr().String(), ip.String()) {
+			t.Fatalf("dst was different than listen addr: %v != %v", ip.String(), c.LocalAddr().String())
+		}
+		return nil
+	}
+
+	// we require that ipv4 be supported
+	if err := testFamily("udp4", "127.0.0.1:0"); err != nil {
+		t.Fatalf("failed to test socket options on IPv4: %v", err)
+	}
+	// IPv6 might not be supported so these will just log
+	if err := testFamily("udp6", "[::1]:0"); err != nil {
+		t.Logf("failed to test socket options on IPv6-only: %v", err)
+	}
+	if err := testFamily("udp", "[::1]:0"); err != nil {
+		t.Logf("failed to test socket options on IPv6/IPv4: %v", err)
+	}
+}
+
+func TestParseDstFromOOB(t *testing.T) {
+	if runtime.GOARCH != "amd64" {
+		// The cmsghdr struct differs in the width (32/64-bit) of
+		// lengths and the struct padding between architectures.
+		// The data below was only written with amd64 in mind, and
+		// thus the test must be skipped on other architectures.
+		t.Skip("skipping test on unsupported architecture")
+	}
+
+	// dst is :ffff:100.100.100.100
+	oob := []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 100, 100, 100, 2, 0, 0, 0}
+	dst := parseDstFromOOB(oob)
+	dst4 := dst.To4()
+	if dst4 == nil {
+		t.Errorf("failed to parse IPv4 in IPv6: %v", dst)
+	} else if dst4.String() != "100.100.100.100" {
+		t.Errorf("unexpected IPv4: %v", dst4)
+	}
+
+	// dst is 2001:db8::1
+	oob = []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 32, 1, 13, 184, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0}
+	dst = parseDstFromOOB(oob)
+	dst6 := dst.To16()
+	if dst6 == nil {
+		t.Errorf("failed to parse IPv6: %v", dst)
+	} else if dst6.String() != "2001:db8::1" {
+		t.Errorf("unexpected IPv6: %v", dst4)
+	}
+
+	// dst is 100.100.100.100 but was received on 10.10.10.10
+	oob = []byte{28, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 0, 0, 0, 2, 0, 0, 0, 10, 10, 10, 10, 100, 100, 100, 100, 0, 0, 0, 0}
+	dst = parseDstFromOOB(oob)
+	dst4 = dst.To4()
+	if dst4 == nil {
+		t.Errorf("failed to parse IPv4: %v", dst)
+	} else if dst4.String() != "100.100.100.100" {
+		t.Errorf("unexpected IPv4: %v", dst4)
+	}
+}
+
+func TestCorrectSource(t *testing.T) {
+	if runtime.GOARCH != "amd64" {
+		// See comment above in TestParseDstFromOOB.
+		t.Skip("skipping test on unsupported architecture")
+	}
+
+	// dst is :ffff:100.100.100.100 which should be counted as IPv4
+	oob := []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 255, 255, 100, 100, 100, 100, 2, 0, 0, 0}
+	soob := correctSource(oob)
+	cm4 := new(ipv4.ControlMessage)
+	cm4.Src = net.ParseIP("100.100.100.100")
+	if !bytes.Equal(soob, cm4.Marshal()) {
+		t.Errorf("unexpected oob for ipv4 address: %v", soob)
+	}
+
+	// dst is 2001:db8::1
+	oob = []byte{36, 0, 0, 0, 0, 0, 0, 0, 41, 0, 0, 0, 50, 0, 0, 0, 32, 1, 13, 184, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0}
+	soob = correctSource(oob)
+	cm6 := new(ipv6.ControlMessage)
+	cm6.Src = net.ParseIP("2001:db8::1")
+	if !bytes.Equal(soob, cm6.Marshal()) {
+		t.Errorf("unexpected oob for IPv6 address: %v", soob)
+	}
+}