127 lines
3.8 KiB
Go
127 lines
3.8 KiB
Go
// +build linux,!appengine
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package dns
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import (
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"bytes"
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"net"
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"strings"
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"testing"
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"time"
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"golang.org/x/net/ipv4"
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"golang.org/x/net/ipv6"
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)
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func TestSetUDPSocketOptions(t *testing.T) {
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// returns an error if we cannot resolve that address
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testFamily := func(n, addr string) error {
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a, err := net.ResolveUDPAddr(n, addr)
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if err != nil {
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return err
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}
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c, err := net.ListenUDP(n, a)
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if err != nil {
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return err
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}
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if err := setUDPSocketOptions(c); err != nil {
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t.Fatalf("failed to set socket options: %v", err)
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}
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ch := make(chan *SessionUDP)
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go func() {
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// Set some deadline so this goroutine doesn't hang forever
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c.SetReadDeadline(time.Now().Add(time.Minute))
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b := make([]byte, 1)
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_, sess, err := ReadFromSessionUDP(c, b)
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if err != nil {
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t.Fatalf("failed to read from conn: %v", err)
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}
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ch <- sess
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}()
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c2, err := net.Dial("udp", c.LocalAddr().String())
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if err != nil {
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t.Fatalf("failed to dial udp: %v", err)
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}
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if _, err := c2.Write([]byte{1}); err != nil {
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t.Fatalf("failed to write to conn: %v", err)
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}
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sess := <-ch
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if len(sess.context) == 0 {
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t.Fatalf("empty session context: %v", sess)
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}
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ip := parseDstFromOOB(sess.context)
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if ip == nil {
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t.Fatalf("failed to parse dst: %v", sess)
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}
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if !strings.Contains(c.LocalAddr().String(), ip.String()) {
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t.Fatalf("dst was different than listen addr: %v != %v", ip.String(), c.LocalAddr().String())
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}
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return nil
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}
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// we require that ipv4 be supported
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if err := testFamily("udp4", "127.0.0.1:0"); err != nil {
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t.Fatalf("failed to test socket options on IPv4: %v", err)
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}
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// IPv6 might not be supported so these will just log
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if err := testFamily("udp6", "[::1]:0"); err != nil {
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t.Logf("failed to test socket options on IPv6-only: %v", err)
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}
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if err := testFamily("udp", "[::1]:0"); err != nil {
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t.Logf("failed to test socket options on IPv6/IPv4: %v", err)
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}
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}
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func TestParseDstFromOOB(t *testing.T) {
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// dst is :ffff:100.100.100.100
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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}
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dst := parseDstFromOOB(oob)
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dst4 := dst.To4()
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if dst4 == nil {
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t.Errorf("failed to parse IPv4 in IPv6: %v", dst)
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} else if dst4.String() != "100.100.100.100" {
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t.Errorf("unexpected IPv4: %v", dst4)
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}
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// dst is 2001:db8::1
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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}
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dst = parseDstFromOOB(oob)
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dst6 := dst.To16()
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if dst6 == nil {
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t.Errorf("failed to parse IPv6: %v", dst)
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} else if dst6.String() != "2001:db8::1" {
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t.Errorf("unexpected IPv6: %v", dst4)
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}
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// dst is 100.100.100.100 but was received on 10.10.10.10
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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}
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dst = parseDstFromOOB(oob)
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dst4 = dst.To4()
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if dst4 == nil {
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t.Errorf("failed to parse IPv4: %v", dst)
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} else if dst4.String() != "100.100.100.100" {
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t.Errorf("unexpected IPv4: %v", dst4)
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}
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}
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func TestCorrectSource(t *testing.T) {
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// dst is :ffff:100.100.100.100 which should be counted as IPv4
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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}
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soob := correctSource(oob)
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cm4 := new(ipv4.ControlMessage)
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cm4.Src = net.ParseIP("100.100.100.100")
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if !bytes.Equal(soob, cm4.Marshal()) {
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t.Errorf("unexpected oob for ipv4 address: %v", soob)
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}
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// dst is 2001:db8::1
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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}
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soob = correctSource(oob)
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cm6 := new(ipv6.ControlMessage)
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cm6.Src = net.ParseIP("2001:db8::1")
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if !bytes.Equal(soob, cm6.Marshal()) {
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t.Errorf("unexpected oob for IPv6 address: %v", soob)
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}
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}
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