Add SUBSPACE_PERSISTENT_KEEPALIVE variable 🍵 (#213)

* Add SUBSPACE_PERSISTENT_KEEPALIVE variable 🍵

* Remove manual Contributors 🍵

README.md

@@ -133,6 +133,7 @@ $ subspace --http-host subspace.example.com
 | `SUBSPACE_THEME`            | `green`             | The theme to use, please refer to [semantic-ui](https://semantic-ui.com/usage/theming.html) for accepted colors                                      |
 | `SUBSPACE_BACKLINK`         | `/`                 | The page to set the home button to                                                                                                                   |
 | `SUBSPACE_DISABLE_DNS`      | `false`             | Whether to disable DNS so the client uses their own configured DNS server(s). Consider disabling DNS server, if supporting international VPN clients |
+| `SUBSPACE_PERSISTENT_KEEPALIVE`      | `0`             | Whether PersistentKeepalive should be enabled for clients (seconds) |
 
 ### Run as a Docker container
 
@@ -211,6 +212,8 @@ docker create \
   # Optional variable to disable DNS server. Enabled by default.
   # consider disabling DNS server, if supporting international VPN clients
     --env SUBSPACE_DISABLE_DNS=0 \
+    # Optional variable to change PersistentKeepalive
+    --env SUBSPACE_PERSISTENT_KEEPALIVE=20 \
     subspacecommunity/subspace:latest
 
 $ sudo docker start subspace
@@ -246,6 +249,7 @@ services:
     - SUBSPACE_IPV6_GW=fd00::10:97:1
     - SUBSPACE_IPV6_NAT_ENABLED=1
     - SUBSPACE_DISABLE_DNS=0
+    - SUBSPACE_PERSISTENT_KEEPALIVE=20
    cap_add:
     - NET_ADMIN
    network_mode: "host"

cmd/subspace/handlers.go

@@ -462,6 +462,10 @@ func profileAddHandler(w *Web) {
 	if shouldDisableDNS := getEnv("SUBSPACE_DISABLE_DNS", "0"); shouldDisableDNS == "1" {
 		disableDNS = true
 	}
+	persistentKeepalive := "0"
+	if keepalive := getEnv("SUBSPACE_PERSISTENT_KEEPALIVE", "nil"); keepalive != "nil" {
+		persistentKeepalive = keepalive
+	}
 
 	script := `
 cd {{$.Datadir}}/wireguard
@@ -489,23 +493,25 @@ PublicKey = $(cat server.public)
 
 Endpoint = {{$.EndpointHost}}:{{$.Listenport}}
 AllowedIPs = {{$.AllowedIPS}}
+PersistentKeepalive = {{$.PersistentKeepalive}}
 WGCLIENT
 `
 	_, err = bash(script, struct {
-		Profile      Profile
-		EndpointHost string
-		Datadir      string
-		IPv4Gw       string
-		IPv6Gw       string
-		IPv4Pref     string
-		IPv6Pref     string
-		IPv4Cidr     string
-		IPv6Cidr     string
-		Listenport   string
-		AllowedIPS   string
-		Ipv4Enabled  bool
-		Ipv6Enabled  bool
-		DisableDNS   bool
+		Profile      		Profile
+		EndpointHost 		string
+		Datadir      		string
+		IPv4Gw       		string
+		IPv6Gw       		string
+		IPv4Pref     		string
+		IPv6Pref     		string
+		IPv4Cidr     		string
+		IPv6Cidr     		string
+		Listenport   		string
+		AllowedIPS   		string
+		Ipv4Enabled  		bool
+		Ipv6Enabled  		bool
+		DisableDNS   		bool
+		PersistentKeepalive string
 	}{
 		profile,
 		endpointHost,
@@ -521,6 +527,7 @@ WGCLIENT
 		ipv4Enabled,
 		ipv6Enabled,
 		disableDNS,
+		persistentKeepalive,
 	})
 	if err != nil {
 		logger.Warn(err)