Load DERP servers from file

app.go

@@ -5,6 +5,7 @@ import (
 	"io/ioutil"
 
 	"github.com/gin-gonic/gin"
+	"tailscale.com/tailcfg"
 	"tailscale.com/wgengine/wgcfg"
 )
 
@@ -12,6 +13,7 @@ type Config struct {
 	ServerURL      string
 	Addr           string
 	PrivateKeyPath string
+	DerpMap        *tailcfg.DERPMap
 
 	DBhost string
 	DBport int

cmd/headscale/headscale.go

@@ -1,10 +1,14 @@
 package main
 
 import (
+	"io"
 	"log"
+	"os"
 
 	"github.com/juanfont/headscale"
 	"github.com/spf13/viper"
+	"gopkg.in/yaml.v2"
+	"tailscale.com/tailcfg"
 )
 
 func main() {
@@ -16,10 +20,16 @@ func main() {
 		log.Fatalf("Fatal error config file: %s \n", err)
 	}
 
+	derpMap, err := loadDerpMap(viper.GetString("derp_map_path"))
+	if err != nil {
+		log.Printf("Could not load DERP servers map file: %s", err)
+	}
+
 	cfg := headscale.Config{
 		ServerURL:      viper.GetString("server_url"),
 		Addr:           viper.GetString("listen_addr"),
 		PrivateKeyPath: viper.GetString("private_key_path"),
+		DerpMap:        derpMap,
 
 		DBhost: viper.GetString("db_host"),
 		DBport: viper.GetInt("db_port"),
@@ -33,3 +43,18 @@ func main() {
 	}
 	h.Serve()
 }
+
+func loadDerpMap(path string) (*tailcfg.DERPMap, error) {
+	derpFile, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer derpFile.Close()
+	var derpMap tailcfg.DERPMap
+	b, err := io.ReadAll(derpFile)
+	if err != nil {
+		return nil, err
+	}
+	err = yaml.Unmarshal(b, &derpMap)
+	return &derpMap, err
+}

config.json.example

@@ -2,7 +2,7 @@
     "server_url": "http://192.168.1.12:8000",
     "listen_addr": "0.0.0.0:8000",
     "private_key_path": "private.key",
-    "public_key_path": "public.key",
+    "derp_map_path": "./derp.yaml",
     "db_host": "localhost",
     "db_port": 5432,
     "db_name": "headscale",

derp.yaml

@@ -0,0 +1,57 @@
+# This file contains some of the official Tailscale DERP servers, 
+# shamelessly taken from https://github.com/tailscale/tailscale/blob/main/derp/derpmap/derpmap.go
+#
+# If you plan to somehow use headscale, please deploy your own DERP infra
+regions: 
+  1:
+    regionid: 1
+    regioncode: nyc
+    regionname: New York City
+    nodes:
+    - name: 1a
+      regionid: 1
+      hostname: derp1.tailscale.com
+      ipv4: 159.89.225.99
+      ipv6: "2604:a880:400:d1::828:b001"
+      stunport: 0
+      stunonly: false
+      derptestport: 0
+  2:
+    regionid: 2
+    regioncode: sfo
+    regionname: San Francisco
+    nodes:
+    - name: 2a
+      regionid: 2
+      hostname: derp2.tailscale.com
+      ipv4: 167.172.206.31
+      ipv6: "2604:a880:2:d1::c5:7001"
+      stunport: 0
+      stunonly: false
+      derptestport: 0
+  3:
+    regionid: 3
+    regioncode: sin
+    regionname: Singapore
+    nodes:
+    - name: 3a
+      regionid: 3
+      hostname: derp3.tailscale.com
+      ipv4: 68.183.179.66
+      ipv6: "2400:6180:0:d1::67d:8001"
+      stunport: 0
+      stunonly: false
+      derptestport: 0
+  4:
+    regionid: 4
+    regioncode: fra
+    regionname: Frankfurt
+    nodes:
+    - name: 4a
+      regionid: 4
+      hostname: derp4.tailscale.com
+      ipv4: 167.172.182.26
+      ipv6: "2a03:b0c0:3:e0::36e:900"
+      stunport: 0
+      stunonly: false
+      derptestport: 0

go.mod

@@ -8,6 +8,7 @@ require (
 	github.com/klauspost/compress v1.11.7
 	github.com/spf13/viper v1.7.1
 	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
+	gopkg.in/yaml.v2 v2.2.8
 	inet.af/netaddr v0.0.0-20210203214853-aa702495c49b
 	tailscale.com v1.1.1-0.20210220175347-39f7a61e9c1f
 

handlers.go

@@ -201,7 +201,7 @@ func (h *Headscale) getMapResponse(mKey wgcfg.Key, req tailcfg.MapRequest, m Mac
 		SearchPaths:  []string{},
 		Domain:       "foobar@example.com",
 		PacketFilter: tailcfg.FilterAllowAll,
-		DERPMap:      &tailcfg.DERPMap{},
+		DERPMap:      h.cfg.DerpMap,
 		UserProfiles: []tailcfg.UserProfile{},
 		Roles:        []tailcfg.Role{}}