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package proxy
import (
"context"
"crypto/tls"
"math"
"testing"
"time"
"github.com/coredns/coredns/plugin/pkg/dnstest"
"github.com/coredns/coredns/plugin/pkg/transport"
"github.com/coredns/coredns/plugin/test"
"github.com/coredns/coredns/request"
"github.com/miekg/dns"
)
func TestProxy(t *testing.T) {
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
ret := new(dns.Msg)
ret.SetReply(r)
ret.Answer = append(ret.Answer, test.A("example.org. IN A 127.0.0.1"))
w.WriteMsg(ret)
})
defer s.Close()
p := NewProxy(s.Addr, transport.DNS)
p.readTimeout = 10 * time.Millisecond
p.Start(5 * time.Second)
m := new(dns.Msg)
m.SetQuestion("example.org.", dns.TypeA)
rec := dnstest.NewRecorder(&test.ResponseWriter{})
req := request.Request{Req: m, W: rec}
resp, err := p.Connect(context.Background(), req, Options{PreferUDP: true})
if err != nil {
t.Errorf("Failed to connect to testdnsserver: %s", err)
}
if x := resp.Answer[0].Header().Name; x != "example.org." {
t.Errorf("Expected %s, got %s", "example.org.", x)
}
}
func TestProxyTLSFail(t *testing.T) {
// This is an udp/tcp test server, so we shouldn't reach it with TLS.
s := dnstest.NewServer(func(w dns.ResponseWriter, r *dns.Msg) {
ret := new(dns.Msg)
ret.SetReply(r)
ret.Answer = append(ret.Answer, test.A("example.org. IN A 127.0.0.1"))
w.WriteMsg(ret)
})
defer s.Close()
p := NewProxy(s.Addr, transport.TLS)
p.readTimeout = 10 * time.Millisecond
p.SetTLSConfig(&tls.Config{})
p.Start(5 * time.Second)
m := new(dns.Msg)
m.SetQuestion("example.org.", dns.TypeA)
rec := dnstest.NewRecorder(&test.ResponseWriter{})
req := request.Request{Req: m, W: rec}
_, err := p.Connect(context.Background(), req, Options{})
if err == nil {
t.Fatal("Expected *not* to receive reply, but got one")
}
}
func TestProtocolSelection(t *testing.T) {
p := NewProxy("bad_address", transport.DNS)
p.readTimeout = 10 * time.Millisecond
stateUDP := request.Request{W: &test.ResponseWriter{}, Req: new(dns.Msg)}
stateTCP := request.Request{W: &test.ResponseWriter{TCP: true}, Req: new(dns.Msg)}
ctx := context.TODO()
go func() {
p.Connect(ctx, stateUDP, Options{})
p.Connect(ctx, stateUDP, Options{ForceTCP: true})
p.Connect(ctx, stateUDP, Options{PreferUDP: true})
p.Connect(ctx, stateUDP, Options{PreferUDP: true, ForceTCP: true})
p.Connect(ctx, stateTCP, Options{})
p.Connect(ctx, stateTCP, Options{ForceTCP: true})
p.Connect(ctx, stateTCP, Options{PreferUDP: true})
p.Connect(ctx, stateTCP, Options{PreferUDP: true, ForceTCP: true})
}()
for i, exp := range []string{"udp", "tcp", "udp", "tcp", "tcp", "tcp", "udp", "tcp"} {
proto := <-p.transport.dial
p.transport.ret <- nil
if proto != exp {
t.Errorf("Unexpected protocol in case %d, expected %q, actual %q", i, exp, proto)
}
}
}
func TestProxyIncrementFails(t *testing.T) {
var testCases = []struct {
name string
fails uint32
expectFails uint32
}{
{
name: "increment fails counter overflows",
fails: math.MaxUint32,
expectFails: math.MaxUint32,
},
{
name: "increment fails counter",
fails: 0,
expectFails: 1,
},
}
for _, tc := range testCases {
t.Run(tc.name, func(t *testing.T) {
p := NewProxy("bad_address", transport.DNS)
p.fails = tc.fails
p.incrementFails()
if p.fails != tc.expectFails {
t.Errorf("Expected fails to be %d, got %d", tc.expectFails, p.fails)
}
})
}
}
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