From 81e0d7d65a55be7df908567da622e1e2f249ceec Mon Sep 17 00:00:00 2001
From: Benjamin Franzke <benjaminfranzke@googlemail.com>
Date: Sun, 25 Sep 2011 11:18:03 +0200
Subject: Add support for transporting audio data using udp

With crypt.c importet from umurmur, changed encrypt key
to use raw_key instead of decrypt_iv.
---
 src/connection.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 113 insertions(+), 1 deletion(-)

(limited to 'src/connection.c')

diff --git a/src/connection.c b/src/connection.c
index 7fefdb3..e7f74bd 100644
--- a/src/connection.c
+++ b/src/connection.c
@@ -3,6 +3,7 @@
 
 #include "connection.h"
 #include "cmumble.h"
+#include "varint.h"
 
 static gboolean
 read_cb(GObject *pollable_stream, gpointer data)
@@ -18,6 +19,118 @@ read_cb(GObject *pollable_stream, gpointer data)
 	return TRUE;
 }
 
+static gboolean
+read_udp_socket(GSocket *socket, GIOCondition condition, gpointer user_data)
+{
+	struct cmumlbe *cm = user_data;
+	GError *error = NULL;
+	guchar data[1024];
+	guchar plain[1020];
+	gssize size;
+
+	size = g_socket_receive(socket, (gchar *) data, sizeof(data),
+				NULL, &error);
+	if (size <= 4)
+		return TRUE;
+
+	if (!CryptState_decrypt(&cm->crypt, data, plain, size))
+		return TRUE;
+
+	cm->con.udp.connected = TRUE;
+
+	cmumble_read_udp_data(cm, plain, size - 4);
+
+	return TRUE;
+}
+
+static void
+send_udp_tcptunnel(struct cmumlbe *cm, guint8 *data, gsize len)
+{
+	MumbleProto__UDPTunnel tunnel;
+
+	mumble_proto__udptunnel__init(&tunnel);
+	tunnel.packet.data = data;
+	tunnel.packet.len = len;
+	cmumble_send_msg(cm, &tunnel.base);
+}
+
+static void
+send_udp(struct cmumlbe *cm, guint8 *data, gsize len)
+{
+	guint8 encrypted[1024];
+	GError *error = NULL;
+
+	g_assert(len <= (sizeof(encrypted) - 4));
+
+	CryptState_encrypt(&cm->crypt, data, encrypted, len);
+	g_socket_send(cm->con.udp.sock, (gchar *) encrypted, len + 4,
+		      NULL, &error);
+}
+
+void
+cmumble_connection_send_udp_data(struct cmumlbe *cm, guint8 *data, gsize len)
+{
+	if (cm->con.udp.connected)
+		send_udp(cm, data, len);
+	else
+		send_udp_tcptunnel(cm, data, len);
+}
+
+static void
+do_udp_ping(struct cmumlbe *cm)
+{
+	uint8_t data[16];
+	uint32_t written = 0, pos = 0;
+	GTimeVal tv;
+
+	g_get_current_time(&tv);
+
+	data[pos++] = (udp_ping << 5);
+	encode_varint(&data[pos], &written, tv.tv_sec, sizeof(data)-pos);
+	pos += written;
+
+	send_udp(cm, data, pos);
+
+	g_print("udp ping sent: timestamp: %ld\n", tv.tv_sec);
+}
+
+void
+cmumble_connection_udp_init(struct cmumlbe *cm)
+{
+	GError *error = NULL;
+	GSocketAddress *saddr;
+
+	cm->con.udp.connected = FALSE;
+	cm->con.udp.sock = g_socket_new(G_SOCKET_FAMILY_IPV4,
+					G_SOCKET_TYPE_DATAGRAM,
+					G_SOCKET_PROTOCOL_UDP,
+					&error);
+	g_assert(error == NULL);
+
+	saddr = g_socket_connection_get_remote_address(cm->con.conn, &error);
+	if (saddr == NULL) {
+		g_printerr("Failed to get remote address for udp setup: %s\n",
+			   error->message);
+		return;
+	}
+
+	if (!g_socket_connect(cm->con.udp.sock, saddr, NULL, &error)) {
+		g_object_unref(saddr);
+		g_object_unref(cm->con.udp.sock);
+		cm->con.udp.sock = NULL;
+		return;
+	}
+	g_object_unref(saddr);
+
+	cm->con.udp.source = g_socket_create_source(cm->con.udp.sock,
+						    G_IO_IN, NULL);
+	g_source_set_callback(cm->con.udp.source,
+			      (GSourceFunc) read_udp_socket, cm, NULL);
+	g_source_attach(cm->con.udp.source, NULL);
+
+	do_udp_ping(cm);
+}
+
 static void
 connection_ready(GObject *source_object, GAsyncResult *res, gpointer user_data)
 {
@@ -48,7 +161,6 @@ connection_ready(GObject *source_object, GAsyncResult *res, gpointer user_data)
 	con->source = g_pollable_input_stream_create_source(con->input, NULL);
 	g_source_set_callback(con->source, (GSourceFunc) read_cb, cm, NULL);
 	g_source_attach(con->source, NULL);
-	g_source_unref(con->source);
 
 	cmumble_protocol_init(cm);
 }
-- 
cgit