diff --git a/.gitignore b/.gitignore index 4c49bd7..8c75193 100644 --- a/.gitignore +++ b/.gitignore @@ -1 +1,2 @@ .env +.overnodebundle diff --git a/Dockerfile b/Dockerfile index f3920b2..2e96b3d 100644 --- a/Dockerfile +++ b/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 install -v ./... -CMD ["goredns"] +RUN go build -o goredns main.go +RUN setcap 'cap_net_bind_service=+ep' goredns +CMD ["./goredns"] diff --git a/README.md b/README.md new file mode 100644 index 0000000..fef6ad7 --- /dev/null +++ b/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 diff --git a/docker-compose.yml b/docker-compose.yml index 292eb16..274c20e 100644 --- a/docker-compose.yml +++ b/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 diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..b514209 --- /dev/null +++ b/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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..a447518 --- /dev/null +++ b/go.sum @@ -0,0 +1,135 @@ +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/aws/aws-sdk-go v1.34.28 h1:sscPpn/Ns3i0F4HPEWAVcwdIRaZZCuL7llJ2/60yPIk= +github.com/aws/aws-sdk-go v1.34.28/go.mod h1:H7NKnBqNVzoTJpGfLrQkkD+ytBA93eiDYi/+8rV9s48= +github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 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v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= diff --git a/main.go b/main.go index c37d35c..c925a68 100644 --- a/main.go +++ b/main.go @@ -1,86 +1,111 @@ package main import ( - "context" - "fmt" - "log" - "os" - "strconv" - "strings" - "time" + "context" + "fmt" + "log" + "os" + "strconv" + "strings" + "time" - "github.com/miekg/dns" - "go.mongodb.org/mongo-driver/bson" - "go.mongodb.org/mongo-driver/mongo" - "go.mongodb.org/mongo-driver/mongo/options" + "github.com/miekg/dns" + "go.mongodb.org/mongo-driver/bson" + "go.mongodb.org/mongo-driver/mongo" + "go.mongodb.org/mongo-driver/mongo/options" ) type InventoryItem struct { - Ip []string + 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) - m.SetReply(r) - m.Compress = false - switch r.Opcode { - case dns.OpcodeQuery: - for _, q := range m.Question { - switch q.Qtype { - case dns.TypeA: - log.Printf("Query for %s\n", q.Name[:len(q.Name)-1]) - cur, err := coll.Find(context.TODO(), bson.M{"hostname":q.Name[:len(q.Name)-1]}) - if err != nil { - 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) - } - } - } - } - } - } - w.WriteMsg(m) - } + return func(w dns.ResponseWriter, r *dns.Msg) { + m := new(dns.Msg) + m.SetReply(r) + m.Compress = false + switch r.Opcode { + case dns.OpcodeQuery: + for _, q := range m.Question { + switch q.Qtype { + case dns.TypeA: + query("A", q.Name[:len(q.Name)-1], m, coll) + case dns.TypeAAAA: + query("AAAA", q.Name[:len(q.Name)-1], m, coll) + } + } + } + w.WriteMsg(m) + } } func main() { - client, err := mongo.NewClient(options.Client().ApplyURI(os.Getenv("MONGO_URI"))) - if err != nil { - log.Fatal(err) - } - ctx, _ := context.WithTimeout(context.Background(), 10*time.Second) - err = client.Connect(ctx) - if err != nil { - log.Fatal(err) - } + client, err := mongo.NewClient(options.Client().ApplyURI(mongoUri)) + if err != nil { + log.Fatal(err) + } + ctx, _ := context.WithTimeout(context.Background(), 10*time.Second) + err = client.Connect(ctx) + if err != nil { + log.Fatal(err) + } - coll := client.Database("kspace_accounting").Collection("inventory") - defer client.Disconnect(ctx) - dns.HandleFunc(".", wrapper(coll)) - port := 5354 - server := &dns.Server{Addr: ":" + strconv.Itoa(port), Net: "udp"} - log.Printf("Starting at %d\n", port) - err2 := server.ListenAndServe() - defer server.Shutdown() - if err2 != nil { - log.Fatalf("Failed to start server: %s\n ", err2.Error()) - } + coll := client.Database("kspace_accounting").Collection("inventory") + defer client.Disconnect(ctx) + dns.HandleFunc(".", wrapper(coll)) + port := 53 + server := &dns.Server{Addr: ":" + strconv.Itoa(port), Net: "udp"} + log.Printf("Starting at %d\n", port) + err2 := server.ListenAndServe() + defer server.Shutdown() + if err2 != nil { + log.Fatalf("Failed to start server: %s\n ", err2.Error()) + } } diff --git a/overnode.yml b/overnode.yml new file mode 100644 index 0000000..a5c5200 --- /dev/null +++ b/overnode.yml @@ -0,0 +1,7 @@ +id: goredns + +version: 3.7 + +goredns: + replica1.yml: 1 + replica2.yml: 2 diff --git a/replica1.yml b/replica1.yml new file mode 100644 index 0000000..94a1216 --- /dev/null +++ b/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 + diff --git a/replica2.yml b/replica2.yml new file mode 100644 index 0000000..b3c3101 --- /dev/null +++ b/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 +