mirror of
https://github.com/miekg/dns.git
synced 2025-11-04 12:41:01 +01:00
dddcd696ba
Reduce some code duplication by making Exchange() use Client.Exchange(). When performing an Exchange if the query ID does not match the answer ID return an error. Also add a test for this condition.
400 lines
8.7 KiB
Go
400 lines
8.7 KiB
Go
package dns
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import (
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"fmt"
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"net"
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"runtime"
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"sync"
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"testing"
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)
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func HelloServer(w ResponseWriter, req *Msg) {
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m := new(Msg)
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m.SetReply(req)
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m.Extra = make([]RR, 1)
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m.Extra[0] = &TXT{Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeTXT, Class: ClassINET, Ttl: 0}, Txt: []string{"Hello world"}}
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w.WriteMsg(m)
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}
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func HelloServerBadId(w ResponseWriter, req *Msg) {
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m := new(Msg)
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m.SetReply(req)
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m.Id += 1
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m.Extra = make([]RR, 1)
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m.Extra[0] = &TXT{Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeTXT, Class: ClassINET, Ttl: 0}, Txt: []string{"Hello world"}}
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w.WriteMsg(m)
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}
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func AnotherHelloServer(w ResponseWriter, req *Msg) {
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m := new(Msg)
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m.SetReply(req)
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m.Extra = make([]RR, 1)
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m.Extra[0] = &TXT{Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeTXT, Class: ClassINET, Ttl: 0}, Txt: []string{"Hello example"}}
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w.WriteMsg(m)
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}
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func RunLocalUDPServer(laddr string) (*Server, string, error) {
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pc, err := net.ListenPacket("udp", laddr)
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if err != nil {
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return nil, "", err
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}
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server := &Server{PacketConn: pc}
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waitLock := sync.Mutex{}
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waitLock.Lock()
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server.NotifyStartedFunc = waitLock.Unlock
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go func() {
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server.ActivateAndServe()
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pc.Close()
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}()
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waitLock.Lock()
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return server, pc.LocalAddr().String(), nil
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}
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func RunLocalUDPServerUnsafe(laddr string) (*Server, string, error) {
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pc, err := net.ListenPacket("udp", laddr)
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if err != nil {
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return nil, "", err
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}
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server := &Server{PacketConn: pc, Unsafe: true}
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waitLock := sync.Mutex{}
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waitLock.Lock()
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server.NotifyStartedFunc = waitLock.Unlock
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go func() {
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server.ActivateAndServe()
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pc.Close()
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}()
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waitLock.Lock()
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return server, pc.LocalAddr().String(), nil
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}
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func RunLocalTCPServer(laddr string) (*Server, string, error) {
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l, err := net.Listen("tcp", laddr)
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if err != nil {
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return nil, "", err
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}
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server := &Server{Listener: l}
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waitLock := sync.Mutex{}
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waitLock.Lock()
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server.NotifyStartedFunc = waitLock.Unlock
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go func() {
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server.ActivateAndServe()
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l.Close()
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}()
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waitLock.Lock()
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return server, l.Addr().String(), nil
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}
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func TestServing(t *testing.T) {
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HandleFunc("miek.nl.", HelloServer)
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HandleFunc("example.com.", AnotherHelloServer)
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defer HandleRemove("miek.nl.")
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defer HandleRemove("example.com.")
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s, addrstr, err := RunLocalUDPServer("127.0.0.1:0")
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if err != nil {
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t.Fatalf("Unable to run test server: %v", err)
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}
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defer s.Shutdown()
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c := new(Client)
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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeTXT)
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r, _, err := c.Exchange(m, addrstr)
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if err != nil || len(r.Extra) == 0 {
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t.Fatal("failed to exchange miek.nl", err)
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}
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txt := r.Extra[0].(*TXT).Txt[0]
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if txt != "Hello world" {
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t.Error("Unexpected result for miek.nl", txt, "!= Hello world")
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}
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m.SetQuestion("example.com.", TypeTXT)
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r, _, err = c.Exchange(m, addrstr)
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if err != nil {
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t.Fatal("failed to exchange example.com", err)
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}
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txt = r.Extra[0].(*TXT).Txt[0]
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if txt != "Hello example" {
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t.Error("Unexpected result for example.com", txt, "!= Hello example")
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}
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// Test Mixes cased as noticed by Ask.
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m.SetQuestion("eXaMplE.cOm.", TypeTXT)
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r, _, err = c.Exchange(m, addrstr)
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if err != nil {
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t.Error("failed to exchange eXaMplE.cOm", err)
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}
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txt = r.Extra[0].(*TXT).Txt[0]
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if txt != "Hello example" {
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t.Error("Unexpected result for example.com", txt, "!= Hello example")
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}
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}
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func BenchmarkServe(b *testing.B) {
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b.StopTimer()
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HandleFunc("miek.nl.", HelloServer)
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defer HandleRemove("miek.nl.")
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a := runtime.GOMAXPROCS(4)
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s, addrstr, err := RunLocalUDPServer("127.0.0.1:0")
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if err != nil {
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b.Fatalf("Unable to run test server: %v", err)
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}
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defer s.Shutdown()
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c := new(Client)
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m := new(Msg)
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m.SetQuestion("miek.nl", TypeSOA)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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c.Exchange(m, addrstr)
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}
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runtime.GOMAXPROCS(a)
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}
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func benchmarkServe6(b *testing.B) {
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b.StopTimer()
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HandleFunc("miek.nl.", HelloServer)
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defer HandleRemove("miek.nl.")
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a := runtime.GOMAXPROCS(4)
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s, addrstr, err := RunLocalUDPServer("[::1]:0")
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if err != nil {
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b.Fatalf("Unable to run test server: %v", err)
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}
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defer s.Shutdown()
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c := new(Client)
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m := new(Msg)
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m.SetQuestion("miek.nl", TypeSOA)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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c.Exchange(m, addrstr)
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}
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runtime.GOMAXPROCS(a)
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}
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func HelloServerCompress(w ResponseWriter, req *Msg) {
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m := new(Msg)
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m.SetReply(req)
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m.Extra = make([]RR, 1)
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m.Extra[0] = &TXT{Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeTXT, Class: ClassINET, Ttl: 0}, Txt: []string{"Hello world"}}
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m.Compress = true
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w.WriteMsg(m)
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}
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func BenchmarkServeCompress(b *testing.B) {
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b.StopTimer()
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HandleFunc("miek.nl.", HelloServerCompress)
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defer HandleRemove("miek.nl.")
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a := runtime.GOMAXPROCS(4)
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s, addrstr, err := RunLocalUDPServer("127.0.0.1:0")
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if err != nil {
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b.Fatalf("Unable to run test server: %v", err)
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}
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defer s.Shutdown()
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c := new(Client)
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m := new(Msg)
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m.SetQuestion("miek.nl", TypeSOA)
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b.StartTimer()
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for i := 0; i < b.N; i++ {
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c.Exchange(m, addrstr)
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}
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runtime.GOMAXPROCS(a)
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}
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func TestDotAsCatchAllWildcard(t *testing.T) {
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mux := NewServeMux()
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mux.Handle(".", HandlerFunc(HelloServer))
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mux.Handle("example.com.", HandlerFunc(AnotherHelloServer))
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handler := mux.match("www.miek.nl.", TypeTXT)
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if handler == nil {
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t.Error("wildcard match failed")
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}
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handler = mux.match("www.example.com.", TypeTXT)
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if handler == nil {
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t.Error("example.com match failed")
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}
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handler = mux.match("a.www.example.com.", TypeTXT)
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if handler == nil {
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t.Error("a.www.example.com match failed")
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}
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handler = mux.match("boe.", TypeTXT)
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if handler == nil {
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t.Error("boe. match failed")
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}
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}
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func TestCaseFolding(t *testing.T) {
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mux := NewServeMux()
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mux.Handle("_udp.example.com.", HandlerFunc(HelloServer))
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handler := mux.match("_dns._udp.example.com.", TypeSRV)
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if handler == nil {
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t.Error("case sensitive characters folded")
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}
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handler = mux.match("_DNS._UDP.EXAMPLE.COM.", TypeSRV)
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if handler == nil {
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t.Error("case insensitive characters not folded")
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}
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}
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func TestRootServer(t *testing.T) {
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mux := NewServeMux()
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mux.Handle(".", HandlerFunc(HelloServer))
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handler := mux.match(".", TypeNS)
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if handler == nil {
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t.Error("root match failed")
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}
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}
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type maxRec struct {
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max int
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sync.RWMutex
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}
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var M = new(maxRec)
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func HelloServerLargeResponse(resp ResponseWriter, req *Msg) {
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m := new(Msg)
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m.SetReply(req)
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m.Authoritative = true
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m1 := 0
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M.RLock()
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m1 = M.max
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M.RUnlock()
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for i := 0; i < m1; i++ {
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aRec := &A{
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Hdr: RR_Header{
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Name: req.Question[0].Name,
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Rrtype: TypeA,
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Class: ClassINET,
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Ttl: 0,
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},
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A: net.ParseIP(fmt.Sprintf("127.0.0.%d", i+1)).To4(),
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}
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m.Answer = append(m.Answer, aRec)
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}
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resp.WriteMsg(m)
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}
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func TestServingLargeResponses(t *testing.T) {
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HandleFunc("example.", HelloServerLargeResponse)
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defer HandleRemove("example.")
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s, addrstr, err := RunLocalUDPServer("127.0.0.1:0")
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if err != nil {
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t.Fatalf("Unable to run test server: %v", err)
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}
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defer s.Shutdown()
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// Create request
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m := new(Msg)
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m.SetQuestion("web.service.example.", TypeANY)
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c := new(Client)
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c.Net = "udp"
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M.Lock()
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M.max = 2
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M.Unlock()
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_, _, err = c.Exchange(m, addrstr)
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if err != nil {
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t.Errorf("failed to exchange: %v", err)
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}
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// This must fail
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M.Lock()
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M.max = 20
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M.Unlock()
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_, _, err = c.Exchange(m, addrstr)
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if err == nil {
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t.Error("failed to fail exchange, this should generate packet error")
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}
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// But this must work again
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c.UDPSize = 7000
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_, _, err = c.Exchange(m, addrstr)
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if err != nil {
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t.Errorf("failed to exchange: %v", err)
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}
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}
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func TestServingResponse(t *testing.T) {
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if testing.Short() {
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t.Skip("skipping test in short mode.")
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}
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HandleFunc("miek.nl.", HelloServer)
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s, addrstr, err := RunLocalUDPServer("127.0.0.1:0")
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if err != nil {
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t.Fatalf("Unable to run test server: %v", err)
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}
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c := new(Client)
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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeTXT)
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m.Response = false
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_, _, err = c.Exchange(m, addrstr)
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if err != nil {
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t.Fatal("failed to exchange", err)
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}
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m.Response = true
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_, _, err = c.Exchange(m, addrstr)
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if err == nil {
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t.Fatal("exchanged response message")
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}
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s.Shutdown()
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s, addrstr, err = RunLocalUDPServerUnsafe("127.0.0.1:0")
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if err != nil {
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t.Fatalf("Unable to run test server: %v", err)
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}
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defer s.Shutdown()
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m.Response = true
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_, _, err = c.Exchange(m, addrstr)
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if err != nil {
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t.Fatal("could exchanged response message in Unsafe mode")
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}
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}
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func TestShutdownTCP(t *testing.T) {
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s, _, err := RunLocalTCPServer("127.0.0.1:0")
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if err != nil {
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t.Fatalf("Unable to run test server: %v", err)
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}
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err = s.Shutdown()
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if err != nil {
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t.Errorf("Could not shutdown test TCP server, %v", err)
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}
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}
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func TestShutdownUDP(t *testing.T) {
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s, _, err := RunLocalUDPServer("127.0.0.1:0")
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if err != nil {
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t.Fatalf("Unable to run test server: %v", err)
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}
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err = s.Shutdown()
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if err != nil {
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t.Errorf("Could not shutdown test UDP server, %v", err)
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}
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}
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