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//go:build linux && !appengine
// +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.Errorf("failed to read from conn: %v", err)
// fallthrough to chan send below
}
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 sess == nil {
// t.Error was already called in the goroutine above.
t.FailNow()
}
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)
}
}
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