From d703b7c09d5eea81ec383fd09c9d320199e6d577 Mon Sep 17 00:00:00 2001
From: Marvin W <git@larma.de>
Date: Sun, 21 Mar 2021 12:41:27 +0100
Subject: Add libnice-based ICE-UDP implementation as plugin

---
 plugins/ice/src/plugin.vala | 63 +++++++++++++++++++++++++++++++++++++--------
 1 file changed, 52 insertions(+), 11 deletions(-)

(limited to 'plugins/ice/src/plugin.vala')

diff --git a/plugins/ice/src/plugin.vala b/plugins/ice/src/plugin.vala
index f1c41a27..3ee8a72a 100644
--- a/plugins/ice/src/plugin.vala
+++ b/plugins/ice/src/plugin.vala
@@ -1,30 +1,71 @@
 using Gee;
-using Nice;
+using Dino.Entities;
 using Xmpp;
+using Xmpp.Xep;
 
-namespace Dino.Plugins.Ice {
+private extern const size_t NICE_ADDRESS_STRING_LEN;
 
-public class Plugin : RootInterface, Object {
+public class Dino.Plugins.Ice.Plugin : RootInterface, Object {
     public Dino.Application app;
 
     public void registered(Dino.Application app) {
+        Nice.debug_enable(true);
         this.app = app;
+        app.stream_interactor.module_manager.initialize_account_modules.connect((account, list) => {
+            list.add(new Module());
+        });
         app.stream_interactor.stream_attached_modules.connect((account, stream) => {
-            stream.get_module(Xmpp.Xep.Socks5Bytestreams.Module.IDENTITY).set_local_ip_address_handler(get_local_ip_addresses);
+            stream.get_module(Socks5Bytestreams.Module.IDENTITY).set_local_ip_address_handler(get_local_ip_addresses);
         });
+        app.stream_interactor.stream_negotiated.connect(on_stream_negotiated);
     }
 
-    private Gee.List<string> get_local_ip_addresses() {
-        Gee.List<string> result = new ArrayList<string>();
-        foreach (string ip_address in Nice.interfaces_get_local_ips(false)) {
-            result.add(ip_address);
+    private async void on_stream_negotiated(Account account, XmppStream stream) {
+        Module? ice_udp_module = stream.get_module(JingleIceUdp.Module.IDENTITY) as Module;
+        if (ice_udp_module == null) return;
+        Gee.List<Xep.ExternalServiceDiscovery.Service> services = yield ExternalServiceDiscovery.request_services(stream);
+        foreach (Xep.ExternalServiceDiscovery.Service service in services) {
+            if (service.transport == "udp" && (service.ty == "stun" || service.ty == "turn")) {
+                InetAddress ip = yield lookup_ipv4_addess(service.host);
+                if (ip == null) continue;
+
+                if (service.ty == "stun") {
+                    debug("Server offers STUN server: %s:%u, resolved to %s", service.host, service.port, ip.to_string());
+                    ice_udp_module.stun_ip = ip.to_string();
+                    ice_udp_module.stun_port = service.port;
+                } else if (service.ty == "turn") {
+                    debug("Server offers TURN server: %s:%u, resolved to %s", service.host, service.port, ip.to_string());
+                    ice_udp_module.turn_ip = ip.to_string();
+                    ice_udp_module.turn_service = service;
+                }
+            }
+        }
+        if (ice_udp_module.stun_ip == null) {
+            InetAddress ip = yield lookup_ipv4_addess("stun.l.google.com");
+            if (ip == null) return;
+
+            debug("Using fallback STUN server: stun.l.google.com:19302, resolved to %s", ip.to_string());
+
+            ice_udp_module.stun_ip = ip.to_string();
+            ice_udp_module.stun_port = 19302;
         }
-        return result;
     }
 
     public void shutdown() {
         // Nothing to do
     }
-}
 
-}
+    private async InetAddress? lookup_ipv4_addess(string host) {
+        try {
+            Resolver resolver = Resolver.get_default();
+            GLib.List<GLib.InetAddress>? ips = yield resolver.lookup_by_name_async(host);
+            foreach (GLib.InetAddress ina in ips) {
+                if (ina.get_family() != SocketFamily.IPV4) continue;
+                return ina;
+            }
+        } catch (Error e) {
+            warning("Failed looking up IP address of %s", host);
+        }
+        return null;
+    }
+}
\ No newline at end of file
-- 
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