mirror of https://github.com/status-im/consul.git
Merge pull request #2267 from hashicorp/b-srv-trim
Fixes bug when trimming DNS SRV records.
This commit is contained in:
James Phillips
GitHub
commit
b6c1543da8
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@ -494,16 +494,78 @@ func (d *DNSServer) formatNodeRecord(node *structs.Node, addr, qName string, qTy
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return records
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}
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// trimUDPAnswers makes sure a UDP response is not longer than allowed by RFC
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// indexRRs populates a map which indexes a given list of RRs by name. NOTE that
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// the names are all squashed to lower case so we can perform case-insensitive
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// lookups; the RRs are not modified.
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func indexRRs(rrs []dns.RR, index map[string]dns.RR) {
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for _, rr := range rrs {
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name := strings.ToLower(rr.Header().Name)
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if _, ok := index[name]; !ok {
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index[name] = rr
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}
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}
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}
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// syncExtra takes a DNS response message and sets the extra data to the most
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// minimal set needed to cover the answer data. A pre-made index of RRs is given
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// so that can be re-used between calls. This assumes that the extra data is
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// only used to provide info for SRV records. If that's not the case, then this
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// will wipe out any additional data.
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func syncExtra(index map[string]dns.RR, resp *dns.Msg) {
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extra := make([]dns.RR, 0, len(resp.Answer))
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resolved := make(map[string]struct{}, len(resp.Answer))
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for _, ansRR := range resp.Answer {
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srv, ok := ansRR.(*dns.SRV)
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if !ok {
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continue
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}
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// Note that we always use lower case when using the index so
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// that compares are not case-sensitive. We don't alter the actual
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// RRs we add into the extra section, however.
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target := strings.ToLower(srv.Target)
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RESOLVE:
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if _, ok := resolved[target]; ok {
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continue
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}
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resolved[target] = struct{}{}
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extraRR, ok := index[target]
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if ok {
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extra = append(extra, extraRR)
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if cname, ok := extraRR.(*dns.CNAME); ok {
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target = strings.ToLower(cname.Target)
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goto RESOLVE
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}
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}
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}
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resp.Extra = extra
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}
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// trimUDPResponse makes sure a UDP response is not longer than allowed by RFC
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// 1035. Enforce an arbitrary limit that can be further ratcheted down by
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// config, and then make sure the response doesn't exceed 512 bytes.
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func trimUDPAnswers(config *DNSConfig, resp *dns.Msg) (trimmed bool) {
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// config, and then make sure the response doesn't exceed 512 bytes. Any extra
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// records will be trimmed along with answers.
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func trimUDPResponse(config *DNSConfig, resp *dns.Msg) (trimmed bool) {
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numAnswers := len(resp.Answer)
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hasExtra := len(resp.Extra) > 0
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// We avoid some function calls and allocations by only handling the
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// extra data when necessary.
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var index map[string]dns.RR
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if hasExtra {
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index = make(map[string]dns.RR, len(resp.Extra))
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indexRRs(resp.Extra, index)
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}
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// This cuts UDP responses to a useful but limited number of responses.
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maxAnswers := lib.MinInt(maxUDPAnswerLimit, config.UDPAnswerLimit)
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if numAnswers > maxAnswers {
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resp.Answer = resp.Answer[:maxAnswers]
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if hasExtra {
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syncExtra(index, resp)
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}
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}
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// This enforces the hard limit of 512 bytes per the RFC. Note that we
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@ -515,6 +577,9 @@ func trimUDPAnswers(config *DNSConfig, resp *dns.Msg) (trimmed bool) {
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resp.Compress = false
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for len(resp.Answer) > 0 && resp.Len() > 512 {
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resp.Answer = resp.Answer[:len(resp.Answer)-1]
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if hasExtra {
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syncExtra(index, resp)
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}
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}
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resp.Compress = compress
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@ -574,15 +639,15 @@ RPC:
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// Add various responses depending on the request
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qType := req.Question[0].Qtype
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d.serviceNodeRecords(datacenter, out.Nodes, req, resp, ttl)
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if qType == dns.TypeSRV {
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d.serviceSRVRecords(datacenter, out.Nodes, req, resp, ttl)
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} else {
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d.serviceNodeRecords(datacenter, out.Nodes, req, resp, ttl)
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}
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// If the network is not TCP, restrict the number of responses
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if network != "tcp" {
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wasTrimmed := trimUDPAnswers(d.config, resp)
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wasTrimmed := trimUDPResponse(d.config, resp)
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// Flag that there are more records to return in the UDP response
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if wasTrimmed && d.config.EnableTruncate {
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@ -679,14 +744,15 @@ RPC:
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// Add various responses depending on the request.
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qType := req.Question[0].Qtype
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d.serviceNodeRecords(datacenter, out.Nodes, req, resp, ttl)
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if qType == dns.TypeSRV {
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d.serviceSRVRecords(datacenter, out.Nodes, req, resp, ttl)
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} else {
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d.serviceNodeRecords(datacenter, out.Nodes, req, resp, ttl)
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}
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// If the network is not TCP, restrict the number of responses.
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if network != "tcp" {
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wasTrimmed := trimUDPAnswers(d.config, resp)
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wasTrimmed := trimUDPResponse(d.config, resp)
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// Flag that there are more records to return in the UDP response
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if wasTrimmed && d.config.EnableTruncate {
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@ -5,6 +5,7 @@ import (
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"math/rand"
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"net"
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"os"
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"reflect"
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"strings"
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"testing"
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"time"
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@ -1986,8 +1987,8 @@ func TestDNS_ServiceLookup_LargeResponses(t *testing.T) {
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longServiceName := "this-is-a-very-very-very-very-very-long-name-for-a-service"
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// Register 3 nodes
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for i := 0; i < 3; i++ {
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// Register a lot of nodes.
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for i := 0; i < 4; i++ {
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args := &structs.RegisterRequest{
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Datacenter: "dc1",
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Node: fmt.Sprintf("foo%d", i),
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@ -2042,12 +2043,32 @@ func TestDNS_ServiceLookup_LargeResponses(t *testing.T) {
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// Make sure the response size is RFC 1035-compliant for UDP messages
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if in.Len() > 512 {
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t.Fatalf("Bad: %#v", in.Len())
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t.Fatalf("Bad: %d", in.Len())
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}
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// We should only have two answers now
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if len(in.Answer) != 2 {
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t.Fatalf("Bad: %#v", len(in.Answer))
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t.Fatalf("Bad: %d", len(in.Answer))
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}
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// Make sure the ADDITIONAL section matches the ANSWER section.
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if len(in.Answer) != len(in.Extra) {
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t.Fatalf("Bad: %d vs. %d", len(in.Answer), len(in.Extra))
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}
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for i := 0; i < len(in.Answer); i++ {
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srv, ok := in.Answer[i].(*dns.SRV)
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if !ok {
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t.Fatalf("Bad: %#v", in.Answer[i])
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}
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a, ok := in.Extra[i].(*dns.A)
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if !ok {
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t.Fatalf("Bad: %#v", in.Extra[i])
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}
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if srv.Target != a.Hdr.Name {
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t.Fatalf("Bad: %#v %#v", srv, a)
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}
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}
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// Check for the truncate bit
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@ -3201,11 +3222,381 @@ func TestDNS_PreparedQuery_AgentSource(t *testing.T) {
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}
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}
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func TestDNS_Compression_trimUDPAnswers(t *testing.T) {
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func TestDNS_trimUDPResponse_NoTrim(t *testing.T) {
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resp := &dns.Msg{
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Answer: []dns.RR{
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&dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Target: "ip-10-0-1-185.node.dc1.consul.",
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},
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},
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Extra: []dns.RR{
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&dns.A{
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Hdr: dns.RR_Header{
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Name: "ip-10-0-1-185.node.dc1.consul.",
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: net.ParseIP("10.0.1.185"),
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},
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},
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}
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config := &DefaultConfig().DNSConfig
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if trimmed := trimUDPResponse(config, resp); trimmed {
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t.Fatalf("Bad %#v", *resp)
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}
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expected := &dns.Msg{
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Answer: []dns.RR{
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&dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Target: "ip-10-0-1-185.node.dc1.consul.",
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},
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},
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Extra: []dns.RR{
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&dns.A{
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Hdr: dns.RR_Header{
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Name: "ip-10-0-1-185.node.dc1.consul.",
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: net.ParseIP("10.0.1.185"),
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},
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},
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}
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if !reflect.DeepEqual(resp, expected) {
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t.Fatalf("Bad %#v vs. %#v", *resp, *expected)
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}
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}
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func TestDNS_trimUDPResponse_TrimLimit(t *testing.T) {
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config := &DefaultConfig().DNSConfig
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resp, expected := &dns.Msg{}, &dns.Msg{}
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for i := 0; i < config.UDPAnswerLimit+1; i++ {
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target := fmt.Sprintf("ip-10-0-1-%d.node.dc1.consul.", 185+i)
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srv := &dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Target: target,
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}
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a := &dns.A{
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Hdr: dns.RR_Header{
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Name: target,
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: net.ParseIP(fmt.Sprintf("10.0.1.%d", 185+i)),
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}
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resp.Answer = append(resp.Answer, srv)
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resp.Extra = append(resp.Extra, a)
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if i < config.UDPAnswerLimit {
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expected.Answer = append(expected.Answer, srv)
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expected.Extra = append(expected.Extra, a)
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}
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}
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if trimmed := trimUDPResponse(config, resp); !trimmed {
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t.Fatalf("Bad %#v", *resp)
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}
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if !reflect.DeepEqual(resp, expected) {
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t.Fatalf("Bad %#v vs. %#v", *resp, *expected)
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}
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}
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func TestDNS_trimUDPResponse_TrimSize(t *testing.T) {
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config := &DefaultConfig().DNSConfig
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resp := &dns.Msg{}
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for i := 0; i < 100; i++ {
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target := fmt.Sprintf("ip-10-0-1-%d.node.dc1.consul.", 185+i)
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srv := &dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Target: target,
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}
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a := &dns.A{
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Hdr: dns.RR_Header{
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Name: target,
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: net.ParseIP(fmt.Sprintf("10.0.1.%d", 185+i)),
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}
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resp.Answer = append(resp.Answer, srv)
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resp.Extra = append(resp.Extra, a)
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}
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// We don't know the exact trim, but we know the resulting answer
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// data should match its extra data.
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if trimmed := trimUDPResponse(config, resp); !trimmed {
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t.Fatalf("Bad %#v", *resp)
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}
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if len(resp.Answer) == 0 || len(resp.Answer) != len(resp.Extra) {
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t.Fatalf("Bad %#v", *resp)
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}
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for i, _ := range resp.Answer {
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srv, ok := resp.Answer[i].(*dns.SRV)
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if !ok {
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t.Fatalf("should be SRV")
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}
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a, ok := resp.Extra[i].(*dns.A)
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if !ok {
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t.Fatalf("should be A")
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}
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if srv.Target != a.Header().Name {
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t.Fatalf("Bad %#v vs. %#v", *srv, *a)
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}
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}
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}
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func TestDNS_syncExtra(t *testing.T) {
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resp := &dns.Msg{
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Answer: []dns.RR{
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// These two are on the same host so the redundant extra
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// records should get deduplicated.
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&dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Port: 1001,
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Target: "ip-10-0-1-185.node.dc1.consul.",
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},
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&dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Port: 1002,
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Target: "ip-10-0-1-185.node.dc1.consul.",
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},
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// This one isn't in the Consul domain so it will get a
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// CNAME and then an A record from the recursor.
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&dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Port: 1003,
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Target: "demo.consul.io.",
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},
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// This one isn't in the Consul domain and it will get
|
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// a CNAME and A record from a recursor that alters the
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// case of the name. This proves we look up in the index
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// in a case-insensitive way.
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&dns.SRV{
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Hdr: dns.RR_Header{
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Port: 1001,
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Target: "insensitive.consul.io.",
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},
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// This is also a CNAME, but it'll be set up to loop to
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// make sure we don't crash.
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&dns.SRV{
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Hdr: dns.RR_Header{
|
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
|
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Class: dns.ClassINET,
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},
|
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Port: 1001,
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Target: "deadly.consul.io.",
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},
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// This is also a CNAME, but it won't have another record.
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&dns.SRV{
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Hdr: dns.RR_Header{
|
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Name: "redis-cache-redis.service.consul.",
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Rrtype: dns.TypeSRV,
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Class: dns.ClassINET,
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},
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Port: 1001,
|
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Target: "nope.consul.io.",
|
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},
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},
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Extra: []dns.RR{
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// These should get deduplicated.
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&dns.A{
|
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Hdr: dns.RR_Header{
|
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Name: "ip-10-0-1-185.node.dc1.consul.",
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
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A: net.ParseIP("10.0.1.185"),
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},
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&dns.A{
|
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Hdr: dns.RR_Header{
|
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Name: "ip-10-0-1-185.node.dc1.consul.",
|
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Rrtype: dns.TypeA,
|
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Class: dns.ClassINET,
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},
|
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A: net.ParseIP("10.0.1.185"),
|
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},
|
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// This is a normal CNAME followed by an A record but we
|
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// have flipped the order. The algorithm should emit them
|
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// in the opposite order.
|
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&dns.A{
|
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Hdr: dns.RR_Header{
|
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Name: "fakeserver.consul.io.",
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Rrtype: dns.TypeA,
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Class: dns.ClassINET,
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},
|
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A: net.ParseIP("127.0.0.1"),
|
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},
|
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&dns.CNAME{
|
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Hdr: dns.RR_Header{
|
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Name: "demo.consul.io.",
|
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Rrtype: dns.TypeCNAME,
|
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Class: dns.ClassINET,
|
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},
|
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Target: "fakeserver.consul.io.",
|
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},
|
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// These differ in case to test case insensitivity.
|
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&dns.CNAME{
|
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Hdr: dns.RR_Header{
|
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Name: "INSENSITIVE.CONSUL.IO.",
|
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Rrtype: dns.TypeCNAME,
|
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Class: dns.ClassINET,
|
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},
|
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Target: "Another.Server.Com.",
|
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},
|
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&dns.A{
|
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Hdr: dns.RR_Header{
|
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Name: "another.server.com.",
|
||||
Rrtype: dns.TypeA,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
A: net.ParseIP("127.0.0.1"),
|
||||
},
|
||||
// This doesn't appear in the answer, so should get
|
||||
// dropped.
|
||||
&dns.A{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "ip-10-0-1-186.node.dc1.consul.",
|
||||
Rrtype: dns.TypeA,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
A: net.ParseIP("10.0.1.186"),
|
||||
},
|
||||
// These two test edge cases with CNAME handling.
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "deadly.consul.io.",
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Target: "deadly.consul.io.",
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "nope.consul.io.",
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Target: "notthere.consul.io.",
|
||||
},
|
||||
},
|
||||
}
|
||||
|
||||
index := make(map[string]dns.RR)
|
||||
indexRRs(resp.Extra, index)
|
||||
syncExtra(index, resp)
|
||||
|
||||
expected := &dns.Msg{
|
||||
Answer: resp.Answer,
|
||||
Extra: []dns.RR{
|
||||
&dns.A{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "ip-10-0-1-185.node.dc1.consul.",
|
||||
Rrtype: dns.TypeA,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
A: net.ParseIP("10.0.1.185"),
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "demo.consul.io.",
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Target: "fakeserver.consul.io.",
|
||||
},
|
||||
&dns.A{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "fakeserver.consul.io.",
|
||||
Rrtype: dns.TypeA,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
A: net.ParseIP("127.0.0.1"),
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "INSENSITIVE.CONSUL.IO.",
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Target: "Another.Server.Com.",
|
||||
},
|
||||
&dns.A{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "another.server.com.",
|
||||
Rrtype: dns.TypeA,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
A: net.ParseIP("127.0.0.1"),
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "deadly.consul.io.",
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Target: "deadly.consul.io.",
|
||||
},
|
||||
&dns.CNAME{
|
||||
Hdr: dns.RR_Header{
|
||||
Name: "nope.consul.io.",
|
||||
Rrtype: dns.TypeCNAME,
|
||||
Class: dns.ClassINET,
|
||||
},
|
||||
Target: "notthere.consul.io.",
|
||||
},
|
||||
},
|
||||
}
|
||||
if !reflect.DeepEqual(resp, expected) {
|
||||
t.Fatalf("Bad %#v vs. %#v", *resp, *expected)
|
||||
}
|
||||
}
|
||||
|
||||
func TestDNS_Compression_trimUDPResponse(t *testing.T) {
|
||||
config := &DefaultConfig().DNSConfig
|
||||
|
||||
m := dns.Msg{}
|
||||
trimUDPAnswers(config, &m)
|
||||
trimUDPResponse(config, &m)
|
||||
if m.Compress {
|
||||
t.Fatalf("compression should be off")
|
||||
}
|
||||
|
|
@ -3213,7 +3604,7 @@ func TestDNS_Compression_trimUDPAnswers(t *testing.T) {
|
|||
// The trim function temporarily turns off compression, so we need to
|
||||
// make sure the setting gets restored properly.
|
||||
m.Compress = true
|
||||
trimUDPAnswers(config, &m)
|
||||
trimUDPResponse(config, &m)
|
||||
if !m.Compress {
|
||||
t.Fatalf("compression should be on")
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue