Moved attributes to dns. namespace

.gitignore

@@ -1 +1,2 @@
 .env
+.overnodebundle

Dockerfile

@@ -1,6 +1,9 @@
-FROM golang:1.10
+FROM golang:1.16-alpine
+RUN apk add libcap git
 WORKDIR $GOPATH/src/git.k-space.ee/pinecrypt/goredns
+COPY go.mod .
+RUN go mod download
 COPY main.go .
-RUN go get -d -v ./...
+RUN go build -o goredns main.go
-RUN go install -v ./...
+RUN setcap 'cap_net_bind_service=+ep' goredns
-CMD ["goredns"]
+CMD ["./goredns"]

README.md

@@ -0,0 +1,4 @@
+docker build -t 172.20.40.1:5000/goredns . \
+ && docker push 172.20.40.1:5000/goredns \
+ && overnode pull \
+ && overnode up

docker-compose.yml

@@ -1,9 +1,13 @@
 version: '3.7'
 
 services:
-  goredns:
+  app:
+    restart: always
+    user: "65535:65534"
     network_mode: host
     build:
       context: .
     env_file: .env
-
+    environment:
+     - ATTRIBUTE_FQDN=dns.fqdn
+     - ATTRIBUTE_SAN=dns.san

go.mod

@@ -0,0 +1,8 @@
+module git.k-space.ee/pinecrypt/goredns
+
+go 1.15
+
+require (
+	github.com/miekg/dns v1.1.40
+	go.mongodb.org/mongo-driver v1.4.6
+)

go.sum

@@ -0,0 +1,135 @@
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+golang.org/x/tools v0.0.0-20190416151739-9c9e1878f421/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190420181800-aa740d480789/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
+golang.org/x/tools v0.0.0-20190531172133-b3315ee88b7d/go.mod h1:/rFqwRUd4F7ZHNgwSSTFct+R/Kf4OFW1sUzUTQQTgfc=
+golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
+golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c h1:dUUwHk2QECo/6vqA44rthZ8ie2QXMNeKRTHCNY2nXvo=
+gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -19,6 +19,53 @@ type InventoryItem struct {
 	Ip []string
 }
 
+var mongoUri string = os.Getenv("MONGO_URI")
+
+func appendResults(etype string, name string, m *dns.Msg, cur *mongo.Cursor) int {
+	count := 0
+	for cur.Next(context.TODO()) {
+		var elem InventoryItem
+		err := cur.Decode(&elem)
+		if err != nil {
+			log.Fatal(err)
+		}
+		for _, ip := range elem.Ip {
+			tp := "A"
+			if strings.Contains(ip, ":") {
+				tp = "AAAA"
+			}
+
+			if etype != tp {
+				continue
+			}
+
+			log.Printf("Appending: %s %s %s\n", name, tp, ip)
+			rr, err := dns.NewRR(fmt.Sprintf("%s. %s %s", name, tp, ip))
+			if err == nil {
+				m.Answer = append(m.Answer, rr)
+				count += 1
+			}
+		}
+	}
+	return count
+}
+
+func query(tp string, name string, m *dns.Msg, coll *mongo.Collection) {
+	// TODO: Validate `name` against RE_FQDN
+	log.Printf("Query %s for %s\n", tp, name)
+	cur, err := coll.Find(context.TODO(), bson.M{"dns.fqdn": name})
+	if err != nil {
+		log.Fatal(err)
+	}
+	if appendResults(tp, name, m, cur) == 0 {
+		cur, err := coll.Find(context.TODO(), bson.M{"dns.san": name})
+		if err != nil {
+			log.Fatal(err)
+		}
+		appendResults(tp, name, m, cur)
+	}
+}
+
 func wrapper(coll *mongo.Collection) func(dns.ResponseWriter, *dns.Msg) {
 	return func(w dns.ResponseWriter, r *dns.Msg) {
 		m := new(dns.Msg)
@@ -29,31 +76,9 @@ func wrapper(coll *mongo.Collection) func(dns.ResponseWriter, *dns.Msg) {
 			for _, q := range m.Question {
 				switch q.Qtype {
 				case dns.TypeA:
-                    log.Printf("Query for %s\n", q.Name[:len(q.Name)-1])
+					query("A", q.Name[:len(q.Name)-1], m, coll)
-                    cur, err := coll.Find(context.TODO(), bson.M{"hostname":q.Name[:len(q.Name)-1]})
+				case dns.TypeAAAA:
-                    if err != nil {
+					query("AAAA", q.Name[:len(q.Name)-1], m, coll)
-                        log.Fatal(err)
-                    }
-
-                    for cur.Next(context.TODO()) {
-                        var elem InventoryItem
-                        err := cur.Decode(&elem)
-                        if err != nil {
-                            log.Fatal(err)
-                        }
-
-                        for _, ip := range elem.Ip {
-                            tp := "A"
-                            if (strings.Contains(ip, ":")) {
-                                tp = "AAAA"
-                            }
-                            rr, err := dns.NewRR(fmt.Sprintf("%s %s %s",
-                              q.Name, tp, ip))
-                            if err == nil {
-                                m.Answer = append(m.Answer, rr)
-                            }
-                        }
-                    }
 				}
 			}
 		}
@@ -62,7 +87,7 @@ func wrapper(coll *mongo.Collection) func(dns.ResponseWriter, *dns.Msg) {
 }
 
 func main() {
-    client, err := mongo.NewClient(options.Client().ApplyURI(os.Getenv("MONGO_URI")))
+	client, err := mongo.NewClient(options.Client().ApplyURI(mongoUri))
 	if err != nil {
 		log.Fatal(err)
 	}
@@ -75,7 +100,7 @@ func main() {
 	coll := client.Database("kspace_accounting").Collection("inventory")
 	defer client.Disconnect(ctx)
 	dns.HandleFunc(".", wrapper(coll))
-    port := 5354
+	port := 53
 	server := &dns.Server{Addr: ":" + strconv.Itoa(port), Net: "udp"}
 	log.Printf("Starting at %d\n", port)
 	err2 := server.ListenAndServe()

overnode.yml

@@ -0,0 +1,7 @@
+id: goredns
+
+version: 3.7
+
+goredns:
+    replica1.yml: 1
+    replica2.yml: 2

replica1.yml

@@ -0,0 +1,16 @@
+version: '3.7'
+
+networks:
+  zoo:
+    external: true
+
+services:
+  app:
+    networks:
+      zoo:
+        ipv4_address: 193.40.103.53
+    build:
+      context: .
+    env_file: .env
+    image: 172.20.40.1:5000/goredns
+

replica2.yml

@@ -0,0 +1,16 @@
+version: '3.7'
+
+networks:
+  zoo:
+    external: true
+
+services:
+  app:
+    networks:
+      zoo:
+        ipv4_address: 62.65.250.53
+    build:
+      context: .
+    env_file: .env
+    image: 172.20.40.1:5000/goredns
+