Moved attributes to `dns.` namespace

master
Lauri Võsandi 2 years ago
parent 7dd6650fd0
commit 696e954805
  1. 1
      .gitignore
  2. 11
      Dockerfile
  3. 4
      README.md
  4. 8
      docker-compose.yml
  5. 8
      go.mod
  6. 135
      go.sum
  7. 165
      main.go
  8. 7
      overnode.yml
  9. 16
      replica1.yml
  10. 16
      replica2.yml

1
.gitignore vendored

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

@ -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"]

@ -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

@ -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

@ -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
)

135
go.sum

@ -0,0 +1,135 @@
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golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
golang.org/x/tools v0.0.0-20190329151228-23e29df326fe/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
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=

@ -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
}
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)
}
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"
}
for cur.Next(context.TODO()) {
var elem InventoryItem
err := cur.Decode(&elem)
if err != nil {
log.Fatal(err)
}
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
}
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)
}
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:
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())
}
}

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

@ -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

@ -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
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