Align plugin/template usage and syntax with other plugins (#1360)

* Align plugin/template usage and syntax with other plugins

* Use new fallthrough logic in plugin/template

* Use zone name normalization for plugin/template

* Test fallthrough parsing in plugin/template

* Rework scoping of match checks

Most matches are not plugin global but per template. The plugin does only a
very rough check while detailed checks are done per-template.

Per template checks include:
- Zones
- Class/Type
- Regex
- Fallthrough

* Remove trailing `.` from fully qualified domain names

* Register template metrics with zone/class/type instead of regex

* Remove trailing fqdn dot from multiple testcases

plugin/template/README.md

@@ -9,29 +9,35 @@ The *template* plugin allows you to dynamically repond to queries by just writin
 ## Syntax
 
 ~~~
-template CLASS TYPE [REGEX...] {
+template CLASS TYPE [ZONE...] {
+    [match REGEX...]
     [answer RR]
     [additional RR]
     [authority RR]
     [...]
-    [rcode CODE]
+    [rcode responsecode]
+    [fallthrough [fallthrough zone...]]
 }
 ~~~
 
-* **CLASS** the query class (usually IN or ANY)
-* **TYPE** the query type (A, PTR, ...)
+* **CLASS** the query class (usually IN or ANY).
+* **TYPE** the query type (A, PTR, ... can be ANY to match all types).
+* **ZONE** the zone scope(s) for this template. Defaults to the server zones.
 * **REGEX** [Go regexp](https://golang.org/pkg/regexp/) that are matched against the incoming question name. Specifying no regex matches everything (default: `.*`). First matching regex wins.
 * `answer|additional|authority` **RR** A [RFC 1035](https://tools.ietf.org/html/rfc1035#section-5) style resource record fragment
   build by a [Go template](https://golang.org/pkg/text/template/) that contains the reply.
 * `rcode` **CODE** A response code (`NXDOMAIN, SERVFAIL, ...`). The default is `SUCCESS`.
+* `fallthrough` Continue with the next plugin if the zone matched but no regex did not match.
+* `fallthrough zone` One or more zones that may fall through to other plugins. Defaults to all zones of the template.
 
-At least one answer section or rcode is needed.
+At least one `answer` or `rcode` directive is needed (e.g. `rcode NXDOMAIN`).
 
 [Also see](#also-see) contains an additional reading list.
 
 ## Templates
 
 Each resource record is a full-featured [Go template](https://golang.org/pkg/text/template/) with the following predefined data
+* `.Zone` the matched zone string (e.g. `example.`).
 * `.Name` the query name, as a string (lowercased).
 * `.Class` the query class (usually `IN`).
 * `.Type` the RR type requested (e.g. `PTR`).
@@ -57,6 +63,22 @@ Both failure cases indicate a problem with the template configuration.
 
 ## Examples
 
+### Resolve everything to NXDOMAIN
+
+The most simplistic template is
+
+~~~ corefile
+. {
+    template ANY ANY {
+      rcode NXDOMAIN
+    }
+}
+~~~
+
+1. This template uses the default zone (`.` or all queries)
+2. All queries will be answered (no `fallthrough`)
+3. The answer is always NXDOMAIN
+
 ### Resolve .invalid as NXDOMAIN
 
 The `.invalid` domain is a reserved TLD (see [RFC-2606 Reserved Top Level DNS Names](https://tools.ietf.org/html/rfc2606#section-2)) to indicate invalid domains.
@@ -65,7 +87,7 @@ The `.invalid` domain is a reserved TLD (see [RFC-2606 Reserved Top Level DNS Na
 . {
     proxy . 8.8.8.8
 
-    template ANY ANY "[.]invalid[.]$" {
+    template ANY ANY invalid {
       rcode NXDOMAIN
       answer "invalid. 60 {{ .Class }} SOA a.invalid. b.invalid. (1 60 60 60 60)"
     }
@@ -75,6 +97,7 @@ The `.invalid` domain is a reserved TLD (see [RFC-2606 Reserved Top Level DNS Na
 1. A query to .invalid will result in NXDOMAIN (rcode)
 2. A dummy SOA record is send to hand out a TTL of 60s for caching
 3. Querying `.invalid` of `CH` will also cause a NXDOMAIN/SOA response
+4. The default regex is `.*`
 
 ### Block invalid search domain completions
 
@@ -88,14 +111,29 @@ path (`dc1.example.com`) added.
 . {
     proxy . 8.8.8.8
 
-    template IN ANY "[.](example[.]com[.]dc1[.]example[.]com[.])$" {
+    template IN ANY example.com.dc1.example.com {
+      rcode NXDOMAIN
+      answer "{{ .Zone }} 60 IN SOA a.{{ .Zone }} b.{{ .Zone }} (1 60 60 60 60)"
+    }
+}
+~~~
+
+A more verbose regex based equivalent would be
+
+~~~ corefile
+. {
+    proxy . 8.8.8.8
+
+    template IN ANY example.com {
+      match "(example.com.dc1.example.com)$"
       rcode NXDOMAIN
       answer "{{ index .Match 1 }} 60 IN SOA a.{{ index .Match 1 }} b.{{ index .Match 1 }} (1 60 60 60 60)"
+      fallthrough
     }
 }
 ~~~
 
-Using numbered matches works well if there are a few groups (1-4).
+The regex based version can do more complex matching/templating while zone based templating is easier to read and use.
 
 ### Resolve A/PTR for .example
 
@@ -105,13 +143,16 @@ Using numbered matches works well if there are a few groups (1-4).
 
     # ip-a-b-c-d.example.com A a.b.c.d
 
-    template IN A (^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+    template IN A example {
+      match (^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
       answer "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
+      fallthrough
     }
 
     # d.c.b.a.in-addr.arpa PTR ip-a-b-c-d.example
 
-    template IN PTR ^(?P<d>[0-9]*)[.](?P<c>[0-9]*)[.](?P<b>[0-9]*)[.]10[.]in-addr[.]arpa[.]$ {
+    template IN PTR 10.in-addr.arpa. {
+      match ^(?P<d>[0-9]*)[.](?P<c>[0-9]*)[.](?P<b>[0-9]*)[.]10[.]in-addr[.]arpa[.]$
       answer "{{ .Name }} 60 IN PTR ip-10-{{ .Group.b }}-{{ .Group.c }}-{{ .Group.d }}.example.com."
     }
 }
@@ -124,14 +165,19 @@ Note that the A record is actually a wildcard, any subdomain of the ip will reso
 
 Having templates to map certain PTR/A pairs is a common pattern.
 
+Fallthrough is needed for mixed domains where only some responses are templated.
+
 ### Resolve multiple ip patterns
 
 ~~~ corefile
 . {
     proxy . 8.8.8.8
 
-    template IN A "^ip-(?P<a>10)-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]dc[.]example[.]$" "^(?P<a>[0-9]*)[.](?P<b>[0-9]*)[.](?P<c>[0-9]*)[.](?P<d>[0-9]*)[.]ext[.]example[.]$" {
+    template IN A example {
+      match "^ip-(?P<a>10)-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]dc[.]example[.]$"
+      match "^(?P<a>[0-9]*)[.](?P<b>[0-9]*)[.](?P<c>[0-9]*)[.](?P<d>[0-9]*)[.]ext[.]example[.]$"
       answer "{{ .Name }} 60 IN A {{ .Group.a}}.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
+      fallthrough
     }
 }
 ~~~
@@ -144,12 +190,16 @@ Named capture groups can be used to template one response for multiple patterns.
 . {
     proxy . 8.8.8.8
 
-    template IN A ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+    template IN A example {
+      match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
       answer "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
+      fallthrough
     }
-    template IN MX ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+    template IN MX example {
+      match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
       answer "{{ .Name }} 60 IN MX 10 {{ .Name }}"
       additional "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
+      fallthrough
     }
 }
 ~~~
@@ -160,20 +210,24 @@ Named capture groups can be used to template one response for multiple patterns.
 . {
     proxy . 8.8.8.8
 
-    template IN A ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+    template IN A example {
+      match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
       answer "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
       authority  "example. 60 IN NS ns0.example."
       authority  "example. 60 IN NS ns1.example."
       additional "ns0.example. 60 IN A 203.0.113.8"
       additional "ns1.example. 60 IN A 198.51.100.8"
+      fallthrough
     }
-    template IN MX ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+    template IN MX example {
+      match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
       answer "{{ .Name }} 60 IN MX 10 {{ .Name }}"
       additional "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
       authority  "example. 60 IN NS ns0.example."
       authority  "example. 60 IN NS ns1.example."
       additional "ns0.example. 60 IN A 203.0.113.8"
       additional "ns1.example. 60 IN A 198.51.100.8"
+      fallthrough
     }
 }
 ~~~

plugin/template/metrics.go

@@ -3,7 +3,10 @@ package template
 import (
 	"sync"
 
+	"github.com/coredns/coredns/core/dnsserver"
 	"github.com/coredns/coredns/plugin"
+	"github.com/coredns/coredns/plugin/metrics"
+	"github.com/mholt/caddy"
 
 	"github.com/prometheus/client_golang/prometheus"
 )
@@ -15,28 +18,38 @@ var (
 		Subsystem: "template",
 		Name:      "matches_total",
 		Help:      "Counter of template regex matches.",
-	}, []string{"regex"})
+	}, []string{"zone", "class", "type"})
 	TemplateFailureCount = prometheus.NewCounterVec(prometheus.CounterOpts{
 		Namespace: plugin.Namespace,
 		Subsystem: "template",
 		Name:      "template_failures_total",
 		Help:      "Counter of go template failures.",
-	}, []string{"regex", "section", "template"})
+	}, []string{"zone", "class", "type", "section", "template"})
 	TemplateRRFailureCount = prometheus.NewCounterVec(prometheus.CounterOpts{
 		Namespace: plugin.Namespace,
 		Subsystem: "template",
 		Name:      "rr_failures_total",
 		Help:      "Counter of mis-templated RRs.",
-	}, []string{"regex", "section", "template"})
+	}, []string{"zone", "class", "type", "section", "template"})
 )
 
 // OnStartupMetrics sets up the metrics on startup.
-func OnStartupMetrics() error {
+func setupMetrics(c *caddy.Controller) error {
+	c.OnStartup(func() error {
 		metricsOnce.Do(func() {
-		prometheus.MustRegister(TemplateMatchesCount)
-		prometheus.MustRegister(TemplateFailureCount)
-		prometheus.MustRegister(TemplateRRFailureCount)
+			m := dnsserver.GetConfig(c).Handler("prometheus")
+			if m == nil {
+				return
+			}
+			if x, ok := m.(*metrics.Metrics); ok {
+				x.MustRegister(TemplateMatchesCount)
+				x.MustRegister(TemplateFailureCount)
+				x.MustRegister(TemplateRRFailureCount)
+			}
 		})
+		return nil
+	})
+
 	return nil
 }
 

plugin/template/setup.go

@@ -19,74 +19,86 @@ func init() {
 }
 
 func setupTemplate(c *caddy.Controller) error {
-	templates, err := templateParse(c)
+	handler, err := templateParse(c)
 	if err != nil {
 		return plugin.Error("template", err)
 	}
 
-	c.OnStartup(OnStartupMetrics)
+	if err := setupMetrics(c); err != nil {
+		return plugin.Error("template", err)
+	}
 
 	dnsserver.GetConfig(c).AddPlugin(func(next plugin.Handler) plugin.Handler {
-		return Handler{Next: next, Templates: templates}
+		handler.Next = next
+		return handler
 	})
 
 	return nil
 }
 
-func templateParse(c *caddy.Controller) (templates []template, err error) {
-	templates = make([]template, 0)
+func templateParse(c *caddy.Controller) (handler Handler, err error) {
+	handler.Templates = make([]template, 0)
 
 	for c.Next() {
-		t := template{}
+
 		if !c.NextArg() {
-			return nil, c.ArgErr()
+			return handler, c.ArgErr()
 		}
-
 		class, ok := dns.StringToClass[c.Val()]
 		if !ok {
-			return nil, c.Errf("invalid query class %s", c.Val())
+			return handler, c.Errf("invalid query class %s", c.Val())
 		}
-		t.class = class
 
 		if !c.NextArg() {
-			return nil, c.ArgErr()
+			return handler, c.ArgErr()
 		}
-		queryType, ok := dns.StringToType[c.Val()]
+		qtype, ok := dns.StringToType[c.Val()]
 		if !ok {
-			return nil, c.Errf("invalid RR type %s", c.Val())
+			return handler, c.Errf("invalid RR class %s", c.Val())
 		}
-		t.qtype = queryType
+
+		zones := c.RemainingArgs()
+		if len(zones) == 0 {
+			zones = make([]string, len(c.ServerBlockKeys))
+			copy(zones, c.ServerBlockKeys)
+		}
+		for i, str := range zones {
+			zones[i] = plugin.Host(str).Normalize()
+		}
+		handler.Zones = append(handler.Zones, zones...)
+
+		t := template{qclass: class, qtype: qtype, zones: zones}
 
 		t.regex = make([]*regexp.Regexp, 0)
 		templatePrefix := ""
 
-		for _, regex := range c.RemainingArgs() {
+		t.answer = make([]*gotmpl.Template, 0)
+
+		for c.NextBlock() {
+			switch c.Val() {
+			case "match":
+				args := c.RemainingArgs()
+				if len(args) == 0 {
+					return handler, c.ArgErr()
+				}
+				for _, regex := range args {
 					r, err := regexp.Compile(regex)
 					if err != nil {
-				return nil, c.Errf("could not parse regex: %s, %v", regex, err)
+						return handler, c.Errf("could not parse regex: %s, %v", regex, err)
 					}
 					templatePrefix = templatePrefix + regex + " "
 					t.regex = append(t.regex, r)
 				}
 
-		if len(t.regex) == 0 {
-			t.regex = append(t.regex, regexp.MustCompile(".*"))
-			templatePrefix = ".* "
-		}
-
-		t.answer = make([]*gotmpl.Template, 0)
-
-		for c.NextBlock() {
-			switch c.Val() {
 			case "answer":
 				args := c.RemainingArgs()
 				if len(args) == 0 {
-					return nil, c.ArgErr()
+					return handler, c.ArgErr()
 				}
 				for _, answer := range args {
 					tmpl, err := gotmpl.New("answer").Parse(answer)
 					if err != nil {
-						return nil, c.Errf("could not compile template: %s, %v", c.Val(), err)
+						return handler, c.Errf("could not compile template: %s, %v", c.Val(), err)
 					}
 					t.answer = append(t.answer, tmpl)
 				}
@@ -94,12 +106,12 @@ func templateParse(c *caddy.Controller) (templates []template, err error) {
 			case "additional":
 				args := c.RemainingArgs()
 				if len(args) == 0 {
-					return nil, c.ArgErr()
+					return handler, c.ArgErr()
 				}
 				for _, additional := range args {
 					tmpl, err := gotmpl.New("additional").Parse(additional)
 					if err != nil {
-						return nil, c.Errf("could not compile template: %s, %v\n", c.Val(), err)
+						return handler, c.Errf("could not compile template: %s, %v\n", c.Val(), err)
 					}
 					t.additional = append(t.additional, tmpl)
 				}
@@ -107,37 +119,49 @@ func templateParse(c *caddy.Controller) (templates []template, err error) {
 			case "authority":
 				args := c.RemainingArgs()
 				if len(args) == 0 {
-					return nil, c.ArgErr()
+					return handler, c.ArgErr()
 				}
 				for _, authority := range args {
 					tmpl, err := gotmpl.New("authority").Parse(authority)
 					if err != nil {
-						return nil, c.Errf("could not compile template: %s, %v\n", c.Val(), err)
+						return handler, c.Errf("could not compile template: %s, %v\n", c.Val(), err)
 					}
 					t.authority = append(t.authority, tmpl)
 				}
 
 			case "rcode":
 				if !c.NextArg() {
-					return nil, c.ArgErr()
+					return handler, c.ArgErr()
 				}
 				rcode, ok := dns.StringToRcode[c.Val()]
 				if !ok {
-					return nil, c.Errf("unknown rcode %s", c.Val())
+					return handler, c.Errf("unknown rcode %s", c.Val())
 				}
 				t.rcode = rcode
 
+			case "fallthrough":
+				args := c.RemainingArgs()
+				if len(args) > 0 {
+					t.fthrough.SetZonesFromArgs(c.RemainingArgs())
+				} else {
+					t.fthrough.SetZonesFromArgs(zones)
+				}
+
 			default:
-				return nil, c.ArgErr()
+				return handler, c.ArgErr()
+			}
 		}
+
+		if len(t.regex) == 0 {
+			t.regex = append(t.regex, regexp.MustCompile(".*"))
 		}
 
 		if len(t.answer) == 0 && len(t.additional) == 0 && t.rcode == dns.RcodeSuccess {
-			return nil, c.Errf("no answer section for template %s %sfound", t.qtype, templatePrefix)
+			return handler, c.Errf("no answer section for template found: %v", handler)
 		}
 
-		templates = append(templates, t)
+		handler.Templates = append(handler.Templates, t)
 	}
 
-	return templates, nil
+	return
 }

plugin/template/setup_test.go

@@ -93,30 +93,37 @@ func TestSetupParse(t *testing.T) {
 		},
 		// examples
 		{
-			`template ANY A ip-(?P<a>[0-9]*)-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]com {
+			`template ANY A example.com {
+				match ip-(?P<a>[0-9]*)-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]com
 				answer "{{ .Name }} A {{ .Group.a }}.{{ .Group.b }}.{{ .Group.c }}.{{ .Grup.d }}."
+				fallthrough
 			}`,
 			false,
 		},
 		{
-			`template IN ANY "[.](example[.]com[.]dc1[.]example[.]com[.])$" {
+			`template IN ANY example.com {
+				match "[.](example[.]com[.]dc1[.]example[.]com[.])$"
 				rcode NXDOMAIN
 				answer "{{ index .Match 1 }} 60 IN SOA a.{{ index .Match 1 }} b.{{ index .Match 1 }} (1 60 60 60 60)"
+				fallthrough example.com
 			}`,
 			false,
 		},
 		{
-			`template IN A ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+			`template IN A example {
+				match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
 				answer "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
 			}
-			template IN MX ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+			template IN MX example. {
+				match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
 				answer "{{ .Name }} 60 IN MX 10 {{ .Name }}"
 				additional "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
 			}`,
 			false,
 		},
 		{
-			`template IN MX ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$ {
+			`template IN MX example {
+					match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
 					answer "{{ .Name }} 60 IN MX 10 {{ .Name }}"
 					additional "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
 					authority  "example. 60 IN NS ns0.example."

plugin/template/template.go

@@ -8,6 +8,7 @@ import (
 	gotmpl "text/template"
 
 	"github.com/coredns/coredns/plugin"
+	"github.com/coredns/coredns/plugin/pkg/fall"
 	"github.com/coredns/coredns/request"
 
 	"github.com/miekg/dns"
@@ -15,21 +16,26 @@ import (
 
 // Handler is a plugin handler that takes a query and templates a response.
 type Handler struct {
+	Zones []string
+
 	Next      plugin.Handler
 	Templates []template
 }
 
 type template struct {
+	zones      []string
 	rcode      int
-	class      uint16
-	qtype      uint16
 	regex      []*regexp.Regexp
 	answer     []*gotmpl.Template
 	additional []*gotmpl.Template
 	authority  []*gotmpl.Template
+	qclass     uint16
+	qtype      uint16
+	fthrough   fall.F
 }
 
 type templateData struct {
+	Zone     string
 	Name     string
 	Regex    string
 	Match    []string
@@ -44,13 +50,21 @@ type templateData struct {
 func (h Handler) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
 	state := request.Request{W: w, Req: r}
 
+	zone := plugin.Zones(h.Zones).Matches(state.Name())
+	if zone == "" {
+		return plugin.NextOrFailure(h.Name(), h.Next, ctx, w, r)
+	}
+
 	for _, template := range h.Templates {
-		data, match := template.match(state)
+		data, match, fthrough := template.match(state, zone)
 		if !match {
+			if !fthrough {
+				return dns.RcodeNameError, nil
+			}
 			continue
 		}
 
-		TemplateMatchesCount.WithLabelValues(data.Regex).Inc()
+		TemplateMatchesCount.WithLabelValues(data.Zone, data.Class, data.Type).Inc()
 
 		if template.rcode == dns.RcodeServerFailure {
 			return template.rcode, nil
@@ -87,7 +101,8 @@ func (h Handler) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg)
 		w.WriteMsg(msg)
 		return template.rcode, nil
 	}
-	return plugin.NextOrFailure(h.Name(), h.Next, ctx, w, r)
+
+	return h.Next.ServeDNS(ctx, w, r)
 }
 
 // Name implements the plugin.Handler interface.
@@ -97,38 +112,53 @@ func executeRRTemplate(section string, template *gotmpl.Template, data templateD
 	buffer := &bytes.Buffer{}
 	err := template.Execute(buffer, data)
 	if err != nil {
-		TemplateFailureCount.WithLabelValues(data.Regex, section, template.Tree.Root.String()).Inc()
+		TemplateFailureCount.WithLabelValues(data.Zone, data.Class, data.Type, section, template.Tree.Root.String()).Inc()
 		return nil, err
 	}
 	rr, err := dns.NewRR(buffer.String())
 	if err != nil {
-		TemplateRRFailureCount.WithLabelValues(data.Regex, section, template.Tree.Root.String()).Inc()
+		TemplateRRFailureCount.WithLabelValues(data.Zone, data.Class, data.Type, section, template.Tree.Root.String()).Inc()
 		return rr, err
 	}
 	return rr, nil
 }
 
-func (t template) match(state request.Request) (templateData, bool) {
+func (t template) match(state request.Request, zone string) (templateData, bool, bool) {
 	q := state.Req.Question[0]
 	data := templateData{}
 
-	if t.class != dns.ClassANY && q.Qclass != dns.ClassANY && q.Qclass != t.class {
-		return data, false
+	zone = plugin.Zones(t.zones).Matches(state.Name())
+	if zone == "" {
+		return data, false, true
+	}
+
+	if t.qclass != dns.ClassANY && q.Qclass != dns.ClassANY && q.Qclass != t.qclass {
+		return data, false, true
 	}
 	if t.qtype != dns.TypeANY && q.Qtype != dns.TypeANY && q.Qtype != t.qtype {
-		return data, false
+		return data, false, true
 	}
+
 	for _, regex := range t.regex {
 		if !regex.MatchString(state.Name()) {
 			continue
 		}
 
+		data.Zone = zone
 		data.Regex = regex.String()
 		data.Name = state.Name()
 		data.Question = &q
 		data.Message = state.Req
+		if q.Qclass != dns.ClassANY {
 			data.Class = dns.ClassToString[q.Qclass]
+		} else {
+			data.Class = dns.ClassToString[t.qclass]
+		}
+		if q.Qtype != dns.TypeANY {
 			data.Type = dns.TypeToString[q.Qtype]
+		} else {
+			data.Type = dns.TypeToString[t.qtype]
+		}
 
 		matches := regex.FindStringSubmatch(state.Name())
 		data.Match = make([]string, len(matches))
@@ -144,7 +174,8 @@ func (t template) match(state request.Request) (templateData, bool) {
 			}
 		}
 
-		return data, true
+		return data, true, false
 	}
-	return data, false
+
+	return data, false, t.fthrough.Through(state.Name())
 }

plugin/template/template_test.go

@@ -7,80 +7,100 @@ import (
 	"testing"
 
 	"github.com/coredns/coredns/plugin/test"
+	"github.com/mholt/caddy"
 
 	gotmpl "text/template"
 
 	"github.com/coredns/coredns/plugin/pkg/dnstest"
+	"github.com/coredns/coredns/plugin/pkg/fall"
 	"github.com/miekg/dns"
 )
 
 func TestHandler(t *testing.T) {
 	rcodeFallthrough := 3841 // reserved for private use, used to indicate a fallthrough
 	exampleDomainATemplate := template{
-		class:  dns.ClassINET,
-		qtype:  dns.TypeA,
 		regex:    []*regexp.Regexp{regexp.MustCompile("(^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$")},
 		answer:   []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"))},
+		qclass:   dns.ClassANY,
+		qtype:    dns.TypeANY,
+		fthrough: fall.F{Zones: []string{"."}},
+		zones:    []string{"."},
 	}
 	exampleDomainANSTemplate := template{
-		class:      dns.ClassINET,
-		qtype:      dns.TypeA,
 		regex:      []*regexp.Regexp{regexp.MustCompile("(^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$")},
 		answer:     []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"))},
 		additional: []*gotmpl.Template{gotmpl.Must(gotmpl.New("additional").Parse("ns0.example. IN A 203.0.113.8"))},
 		authority:  []*gotmpl.Template{gotmpl.Must(gotmpl.New("authority").Parse("example. IN NS ns0.example.com."))},
+		qclass:     dns.ClassANY,
+		qtype:      dns.TypeANY,
+		fthrough:   fall.F{Zones: []string{"."}},
+		zones:      []string{"."},
 	}
 	exampleDomainMXTemplate := template{
-		class:      dns.ClassINET,
-		qtype:      dns.TypeMX,
 		regex:      []*regexp.Regexp{regexp.MustCompile("(^|[.])ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$")},
 		answer:     []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 MX 10 {{ .Name }}"))},
 		additional: []*gotmpl.Template{gotmpl.Must(gotmpl.New("additional").Parse("{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"))},
+		qclass:     dns.ClassANY,
+		qtype:      dns.TypeANY,
+		fthrough:   fall.F{Zones: []string{"."}},
+		zones:      []string{"."},
 	}
 	invalidDomainTemplate := template{
-		class:  dns.ClassANY,
-		qtype:  dns.TypeANY,
 		regex:    []*regexp.Regexp{regexp.MustCompile("[.]invalid[.]$")},
 		rcode:    dns.RcodeNameError,
 		answer:   []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("invalid. 60 {{ .Class }} SOA a.invalid. b.invalid. (1 60 60 60 60)"))},
+		qclass:   dns.ClassANY,
+		qtype:    dns.TypeANY,
+		fthrough: fall.F{Zones: []string{"."}},
+		zones:    []string{"."},
 	}
 	rcodeServfailTemplate := template{
-		class: dns.ClassANY,
-		qtype: dns.TypeANY,
 		regex:    []*regexp.Regexp{regexp.MustCompile(".*")},
 		rcode:    dns.RcodeServerFailure,
+		qclass:   dns.ClassANY,
+		qtype:    dns.TypeANY,
+		fthrough: fall.F{Zones: []string{"."}},
+		zones:    []string{"."},
 	}
 	brokenTemplate := template{
-		class:  dns.ClassINET,
-		qtype:  dns.TypeA,
 		regex:    []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
 		answer:   []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }} 60 IN TXT \"{{ index .Match 2 }}\""))},
+		qclass:   dns.ClassANY,
+		qtype:    dns.TypeANY,
+		fthrough: fall.F{Zones: []string{"."}},
+		zones:    []string{"."},
 	}
 	nonRRTemplate := template{
-		class:  dns.ClassINET,
-		qtype:  dns.TypeA,
 		regex:    []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
 		answer:   []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }}"))},
+		qclass:   dns.ClassANY,
+		qtype:    dns.TypeANY,
+		fthrough: fall.F{Zones: []string{"."}},
+		zones:    []string{"."},
 	}
 	nonRRAdditionalTemplate := template{
-		class:      dns.ClassINET,
-		qtype:      dns.TypeA,
 		regex:      []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
 		additional: []*gotmpl.Template{gotmpl.Must(gotmpl.New("answer").Parse("{{ .Name }}"))},
+		qclass:     dns.ClassANY,
+		qtype:      dns.TypeANY,
+		fthrough:   fall.F{Zones: []string{"."}},
+		zones:      []string{"."},
 	}
 	nonRRAuthoritativeTemplate := template{
-		class:     dns.ClassINET,
-		qtype:     dns.TypeA,
 		regex:     []*regexp.Regexp{regexp.MustCompile("[.]example[.]$")},
 		authority: []*gotmpl.Template{gotmpl.Must(gotmpl.New("authority").Parse("{{ .Name }}"))},
+		qclass:    dns.ClassANY,
+		qtype:     dns.TypeANY,
+		fthrough:  fall.F{Zones: []string{"."}},
+		zones:     []string{"."},
 	}
 
 	tests := []struct {
 		tmpl           template
 		qname          string
+		name           string
 		qclass         uint16
 		qtype          uint16
-		name           string
 		expectedCode   int
 		expectedErr    string
 		verifyResponse func(*dns.Msg) error
@@ -88,8 +108,6 @@ func TestHandler(t *testing.T) {
 		{
 			name:         "RcodeServFail",
 			tmpl:         rcodeServfailTemplate,
-			qclass:       dns.ClassANY,
-			qtype:        dns.TypeANY,
 			qname:        "test.invalid.",
 			expectedCode: dns.RcodeServerFailure,
 			verifyResponse: func(r *dns.Msg) error {
@@ -221,22 +239,6 @@ func TestHandler(t *testing.T) {
 				return nil
 			},
 		},
-		{
-			name:         "ExampleDomainMismatchType",
-			tmpl:         exampleDomainATemplate,
-			qclass:       dns.ClassINET,
-			qtype:        dns.TypeMX,
-			qname:        "ip-10-95-12-8.example.",
-			expectedCode: rcodeFallthrough,
-		},
-		{
-			name:         "ExampleDomainMismatchClass",
-			tmpl:         exampleDomainATemplate,
-			qclass:       dns.ClassCHAOS,
-			qtype:        dns.TypeA,
-			qname:        "ip-10-95-12-8.example.",
-			expectedCode: rcodeFallthrough,
-		},
 		{
 			name:         "ExampleInvalidNXDOMAIN",
 			tmpl:         invalidDomainTemplate,
@@ -261,6 +263,7 @@ func TestHandler(t *testing.T) {
 	for _, tr := range tests {
 		handler := Handler{
 			Next:      test.NextHandler(rcodeFallthrough, nil),
+			Zones:     []string{"."},
 			Templates: []template{tr.tmpl},
 		}
 		req := &dns.Msg{
@@ -292,3 +295,149 @@ func TestHandler(t *testing.T) {
 		}
 	}
 }
+
+// TestMultiSection verfies that a corefile with mutliple but different template sections works
+func TestMultiSection(t *testing.T) {
+	rcodeFallthrough := 3841 // reserved for private use, used to indicate a fallthrough
+	ctx := context.TODO()
+
+	multisectionConfig := `
+		# Implicit section (see c.ServerBlockKeys)
+		# test.:8053 {
+
+	  # REFUSE IN A for the server zone (test.)
+		template IN A {
+			rcode REFUSED
+		}
+		# Fallthrough everyting IN TXT for test.
+		template IN TXT {
+			match "$^"
+			rcode SERVFAIL
+			fallthrough
+		}
+		# Answer CH TXT *.coredns.invalid. / coredns.invalid.
+		template CH TXT coredns.invalid {
+			answer "{{ .Name }} 60 CH TXT \"test\""
+		}
+		# Anwser example. ip templates and fallthrough otherwise
+		template IN A example {
+			match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
+			answer "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
+			fallthrough
+		}
+		# Answer MX record requests for ip templates in example. and never fall through
+		template IN MX example {
+			match ^ip-10-(?P<b>[0-9]*)-(?P<c>[0-9]*)-(?P<d>[0-9]*)[.]example[.]$
+			answer "{{ .Name }} 60 IN MX 10 {{ .Name }}"
+			additional "{{ .Name }} 60 IN A 10.{{ .Group.b }}.{{ .Group.c }}.{{ .Group.d }}"
+		}
+		`
+	c := caddy.NewTestController("dns", multisectionConfig)
+	c.ServerBlockKeys = []string{"test.:8053"}
+
+	handler, err := templateParse(c)
+	if err != nil {
+		t.Fatalf("TestMultiSection could not parse config: %v", err)
+	}
+
+	handler.Next = test.NextHandler(rcodeFallthrough, nil)
+
+	rec := dnstest.NewRecorder(&test.ResponseWriter{})
+
+	// Asking for test. IN A -> REFUSED
+
+	req := &dns.Msg{Question: []dns.Question{{Name: "some.test.", Qclass: dns.ClassINET, Qtype: dns.TypeA}}}
+	code, err := handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving some.test. A, got: %v", err)
+	}
+	if code != dns.RcodeRefused {
+		t.Fatalf("TestMultiSection expected response code REFUSED got: %v", code)
+	}
+
+	// Asking for test. IN TXT -> fallthrough
+
+	req = &dns.Msg{Question: []dns.Question{{Name: "some.test.", Qclass: dns.ClassINET, Qtype: dns.TypeTXT}}}
+	code, err = handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving some.test. TXT, got: %v", err)
+	}
+	if code != rcodeFallthrough {
+		t.Fatalf("TestMultiSection expected response code fallthrough got: %v", code)
+	}
+
+	// Asking for coredns.invalid. CH TXT -> TXT "test"
+
+	req = &dns.Msg{Question: []dns.Question{{Name: "coredns.invalid.", Qclass: dns.ClassCHAOS, Qtype: dns.TypeTXT}}}
+	code, err = handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving coredns.invalid. TXT, got: %v", err)
+	}
+	if code != dns.RcodeSuccess {
+		t.Fatalf("TestMultiSection expected success response for coredns.invalid. TXT got: %v", code)
+	}
+	if len(rec.Msg.Answer) != 1 {
+		t.Fatalf("TestMultiSection expected one answer for coredns.invalid. TXT got: %v", rec.Msg.Answer)
+	}
+	if rec.Msg.Answer[0].Header().Rrtype != dns.TypeTXT || rec.Msg.Answer[0].(*dns.TXT).Txt[0] != "test" {
+		t.Fatalf("TestMultiSection a \"test\" answer for coredns.invalid. TXT got: %v", rec.Msg.Answer[0])
+	}
+
+	// Asking for an ip template in example
+
+	req = &dns.Msg{Question: []dns.Question{{Name: "ip-10-11-12-13.example.", Qclass: dns.ClassINET, Qtype: dns.TypeA}}}
+	code, err = handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving ip-10-11-12-13.example. IN A, got: %v", err)
+	}
+	if code != dns.RcodeSuccess {
+		t.Fatalf("TestMultiSection expected success response ip-10-11-12-13.example. IN A got: %v, %v", code, dns.RcodeToString[code])
+	}
+	if len(rec.Msg.Answer) != 1 {
+		t.Fatalf("TestMultiSection expected one answer for ip-10-11-12-13.example. IN A got: %v", rec.Msg.Answer)
+	}
+	if rec.Msg.Answer[0].Header().Rrtype != dns.TypeA {
+		t.Fatalf("TestMultiSection an A RR answer for ip-10-11-12-13.example. IN A got: %v", rec.Msg.Answer[0])
+	}
+
+	// Asking for an MX ip template in example
+
+	req = &dns.Msg{Question: []dns.Question{{Name: "ip-10-11-12-13.example.", Qclass: dns.ClassINET, Qtype: dns.TypeMX}}}
+	code, err = handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving ip-10-11-12-13.example. IN MX, got: %v", err)
+	}
+	if code != dns.RcodeSuccess {
+		t.Fatalf("TestMultiSection expected success response ip-10-11-12-13.example. IN MX got: %v, %v", code, dns.RcodeToString[code])
+	}
+	if len(rec.Msg.Answer) != 1 {
+		t.Fatalf("TestMultiSection expected one answer for ip-10-11-12-13.example. IN MX got: %v", rec.Msg.Answer)
+	}
+	if rec.Msg.Answer[0].Header().Rrtype != dns.TypeMX {
+		t.Fatalf("TestMultiSection an A RR answer for ip-10-11-12-13.example. IN MX got: %v", rec.Msg.Answer[0])
+	}
+
+	// Test that something.example. A does fall through but something.example. MX does not
+
+	req = &dns.Msg{Question: []dns.Question{{Name: "something.example.", Qclass: dns.ClassINET, Qtype: dns.TypeA}}}
+	code, err = handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving something.example. IN A, got: %v", err)
+	}
+	if code != rcodeFallthrough {
+		t.Fatalf("TestMultiSection expected a fall through resolving something.example. IN A, got: %v, %v", code, dns.RcodeToString[code])
+	}
+
+	req = &dns.Msg{Question: []dns.Question{{Name: "something.example.", Qclass: dns.ClassINET, Qtype: dns.TypeMX}}}
+	code, err = handler.ServeDNS(ctx, rec, req)
+	if err != nil {
+		t.Fatalf("TestMultiSection expected no error resolving something.example. IN MX, got: %v", err)
+	}
+	if code == rcodeFallthrough {
+		t.Fatalf("TestMultiSection expected no fall through resolving something.example. IN MX")
+	}
+	if code != dns.RcodeNameError {
+		t.Fatalf("TestMultiSection expected NXDOMAIN resolving something.example. IN MX, got %v, %v", code, dns.RcodeToString[code])
+	}
+
+}