384 lines
9.5 KiB
Go
384 lines
9.5 KiB
Go
package dns
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import (
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"fmt"
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"net"
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"strconv"
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"testing"
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"time"
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)
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func TestClientSync(t *testing.T) {
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HandleFunc("miek.nl.", HelloServer)
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defer HandleRemove("miek.nl.")
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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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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeSOA)
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c := new(Client)
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r, _, 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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if r != nil && r.Rcode != RcodeSuccess {
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t.Errorf("failed to get an valid answer\n%v", r)
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}
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// And now with plain Exchange().
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r, err = 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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if r == nil || r.Rcode != RcodeSuccess {
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t.Errorf("failed to get an valid answer\n%v", r)
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}
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}
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func TestClientSyncBadId(t *testing.T) {
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HandleFunc("miek.nl.", HelloServerBadId)
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defer HandleRemove("miek.nl.")
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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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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeSOA)
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c := new(Client)
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if _, _, err := c.Exchange(m, addrstr); err != ErrId {
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t.Errorf("did not find a bad Id")
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}
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// And now with plain Exchange().
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if _, err := Exchange(m, addrstr); err != ErrId {
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t.Errorf("did not find a bad Id")
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}
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}
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func TestClientEDNS0(t *testing.T) {
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HandleFunc("miek.nl.", HelloServer)
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defer HandleRemove("miek.nl.")
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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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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeDNSKEY)
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m.SetEdns0(2048, true)
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c := new(Client)
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r, _, 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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if r != nil && r.Rcode != RcodeSuccess {
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t.Errorf("failed to get an valid answer\n%v", r)
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}
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}
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// Validates the transmission and parsing of local EDNS0 options.
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func TestClientEDNS0Local(t *testing.T) {
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optStr1 := "1979:0x0707"
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optStr2 := strconv.Itoa(EDNS0LOCALSTART) + ":0x0601"
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handler := func(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, 2)
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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 local edns"}}
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// If the local options are what we expect, then reflect them back.
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ec1 := req.Extra[0].(*OPT).Option[0].(*EDNS0_LOCAL).String()
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ec2 := req.Extra[0].(*OPT).Option[1].(*EDNS0_LOCAL).String()
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if ec1 == optStr1 && ec2 == optStr2 {
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m.Extra = append(m.Extra, req.Extra[0])
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}
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w.WriteMsg(m)
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}
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HandleFunc("miek.nl.", handler)
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defer HandleRemove("miek.nl.")
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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: %s", err)
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}
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defer s.Shutdown()
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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeTXT)
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// Add two local edns options to the query.
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ec1 := &EDNS0_LOCAL{Code: 1979, Data: []byte{7, 7}}
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ec2 := &EDNS0_LOCAL{Code: EDNS0LOCALSTART, Data: []byte{6, 1}}
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o := &OPT{Hdr: RR_Header{Name: ".", Rrtype: TypeOPT}, Option: []EDNS0{ec1, ec2}}
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m.Extra = append(m.Extra, o)
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c := new(Client)
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r, _, e := c.Exchange(m, addrstr)
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if e != nil {
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t.Logf("failed to exchange: %s", e.Error())
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t.Fail()
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}
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if r != nil && r.Rcode != RcodeSuccess {
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t.Log("failed to get a valid answer")
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t.Fail()
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t.Logf("%v\n", r)
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}
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txt := r.Extra[0].(*TXT).Txt[0]
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if txt != "Hello local edns" {
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t.Log("Unexpected result for miek.nl", txt, "!= Hello local edns")
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t.Fail()
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}
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// Validate the local options in the reply.
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got := r.Extra[1].(*OPT).Option[0].(*EDNS0_LOCAL).String()
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if got != optStr1 {
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t.Logf("failed to get local edns0 answer; got %s, expected %s", got, optStr1)
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t.Fail()
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t.Logf("%v\n", r)
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}
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got = r.Extra[1].(*OPT).Option[1].(*EDNS0_LOCAL).String()
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if got != optStr2 {
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t.Logf("failed to get local edns0 answer; got %s, expected %s", got, optStr2)
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t.Fail()
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t.Logf("%v\n", r)
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}
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}
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// ExampleTsigSecret_updateLeaseTSIG shows how to update a lease signed with TSIG
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func ExampleTsigSecret_updateLeaseTSIG() {
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m := new(Msg)
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m.SetUpdate("t.local.ip6.io.")
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rr, _ := NewRR("t.local.ip6.io. 30 A 127.0.0.1")
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rrs := make([]RR, 1)
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rrs[0] = rr
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m.Insert(rrs)
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leaseRr := new(OPT)
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leaseRr.Hdr.Name = "."
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leaseRr.Hdr.Rrtype = TypeOPT
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e := new(EDNS0_UL)
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e.Code = EDNS0UL
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e.Lease = 120
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leaseRr.Option = append(leaseRr.Option, e)
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m.Extra = append(m.Extra, leaseRr)
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c := new(Client)
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m.SetTsig("polvi.", HmacMD5, 300, time.Now().Unix())
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c.TsigSecret = map[string]string{"polvi.": "pRZgBrBvI4NAHZYhxmhs/Q=="}
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_, _, err := c.Exchange(m, "127.0.0.1:53")
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if err != nil {
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panic(err)
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}
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}
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func TestClientConn(t *testing.T) {
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HandleFunc("miek.nl.", HelloServer)
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defer HandleRemove("miek.nl.")
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// This uses TCP just to make it slightly different than TestClientSync
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s, addrstr, 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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defer s.Shutdown()
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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeSOA)
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cn, err := Dial("tcp", addrstr)
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if err != nil {
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t.Errorf("failed to dial %s: %v", addrstr, err)
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}
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err = cn.WriteMsg(m)
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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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r, err := cn.ReadMsg()
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if r == nil || r.Rcode != RcodeSuccess {
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t.Errorf("failed to get an valid answer\n%v", r)
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}
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err = cn.WriteMsg(m)
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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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h := new(Header)
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buf, err := cn.ReadMsgHeader(h)
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if buf == nil {
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t.Errorf("failed to get an valid answer\n%v", r)
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}
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if int(h.Bits&0xF) != RcodeSuccess {
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t.Errorf("failed to get an valid answer in ReadMsgHeader\n%v", r)
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}
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if h.Ancount != 0 || h.Qdcount != 1 || h.Nscount != 0 || h.Arcount != 1 {
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t.Errorf("expected to have question and additional in response; got something else: %+v", h)
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}
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if err = r.Unpack(buf); err != nil {
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t.Errorf("unable to unpack message fully: %v", err)
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}
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}
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func TestTruncatedMsg(t *testing.T) {
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m := new(Msg)
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m.SetQuestion("miek.nl.", TypeSRV)
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cnt := 10
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for i := 0; i < cnt; i++ {
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r := &SRV{
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Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeSRV, Class: ClassINET, Ttl: 0},
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Port: uint16(i + 8000),
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Target: "target.miek.nl.",
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}
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m.Answer = append(m.Answer, r)
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re := &A{
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Hdr: RR_Header{Name: m.Question[0].Name, Rrtype: TypeA, Class: ClassINET, Ttl: 0},
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A: net.ParseIP(fmt.Sprintf("127.0.0.%d", i)).To4(),
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}
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m.Extra = append(m.Extra, re)
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}
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buf, err := m.Pack()
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if err != nil {
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t.Errorf("failed to pack: %v", err)
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}
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r := new(Msg)
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if err = r.Unpack(buf); err != nil {
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t.Errorf("unable to unpack message: %v", err)
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}
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if len(r.Answer) != cnt {
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t.Logf("answer count after regular unpack doesn't match: %d", len(r.Answer))
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t.Fail()
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}
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if len(r.Extra) != cnt {
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t.Logf("extra count after regular unpack doesn't match: %d", len(r.Extra))
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t.Fail()
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}
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m.Truncated = true
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buf, err = m.Pack()
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if err != nil {
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t.Errorf("failed to pack truncated: %v", err)
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}
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r = new(Msg)
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if err = r.Unpack(buf); err != nil && err != ErrTruncated {
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t.Errorf("unable to unpack truncated message: %v", err)
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}
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if !r.Truncated {
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t.Log("truncated message wasn't unpacked as truncated")
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t.Fail()
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}
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if len(r.Answer) != cnt {
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t.Logf("answer count after truncated unpack doesn't match: %d", len(r.Answer))
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t.Fail()
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}
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if len(r.Extra) != cnt {
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t.Logf("extra count after truncated unpack doesn't match: %d", len(r.Extra))
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t.Fail()
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}
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// Now we want to remove almost all of the extra records
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// We're going to loop over the extra to get the count of the size of all
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// of them
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off := 0
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buf1 := make([]byte, m.Len())
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for i := 0; i < len(m.Extra); i++ {
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off, err = PackRR(m.Extra[i], buf1, off, nil, m.Compress)
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if err != nil {
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t.Errorf("failed to pack extra: %v", err)
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}
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}
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// Remove all of the extra bytes but 10 bytes from the end of buf
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off -= 10
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buf1 = buf[:len(buf)-off]
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r = new(Msg)
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if err = r.Unpack(buf1); err != nil && err != ErrTruncated {
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t.Errorf("unable to unpack cutoff message: %v", err)
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}
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if !r.Truncated {
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t.Log("truncated cutoff message wasn't unpacked as truncated")
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t.Fail()
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}
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if len(r.Answer) != cnt {
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t.Logf("answer count after cutoff unpack doesn't match: %d", len(r.Answer))
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t.Fail()
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}
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if len(r.Extra) != 0 {
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t.Logf("extra count after cutoff unpack is not zero: %d", len(r.Extra))
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t.Fail()
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}
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// Now we want to remove almost all of the answer records too
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buf1 = make([]byte, m.Len())
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as := 0
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for i := 0; i < len(m.Extra); i++ {
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off1 := off
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off, err = PackRR(m.Extra[i], buf1, off, nil, m.Compress)
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as = off - off1
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if err != nil {
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t.Errorf("failed to pack extra: %v", err)
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}
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}
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// Keep exactly one answer left
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// This should still cause Answer to be nil
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off -= as
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buf1 = buf[:len(buf)-off]
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r = new(Msg)
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if err = r.Unpack(buf1); err != nil && err != ErrTruncated {
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t.Errorf("unable to unpack cutoff message: %v", err)
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}
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if !r.Truncated {
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t.Log("truncated cutoff message wasn't unpacked as truncated")
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t.Fail()
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}
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if len(r.Answer) != 0 {
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t.Logf("answer count after second cutoff unpack is not zero: %d", len(r.Answer))
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t.Fail()
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}
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// Now leave only 1 byte of the question
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// Since the header is always 12 bytes, we just need to keep 13
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buf1 = buf[:13]
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r = new(Msg)
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err = r.Unpack(buf1)
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if err == nil || err == ErrTruncated {
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t.Logf("error should not be ErrTruncated from question cutoff unpack: %v", err)
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t.Fail()
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}
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// Finally, if we only have the header, we should still return an error
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buf1 = buf[:12]
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r = new(Msg)
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if err = r.Unpack(buf1); err == nil || err != ErrTruncated {
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t.Logf("error not ErrTruncated from header-only unpack: %v", err)
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t.Fail()
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}
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}
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