Udp

common/network/Udp.cxx

@@ -0,0 +1,155 @@
+/* Copyright (C) Kasm
+ *
+ * This is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This software is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307,
+ * USA.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <arpa/inet.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <time.h>
+
+#include <network/GetAPI.h>
+#include <network/Udp.h>
+#include <network/webudp/WuHost.h>
+#include <network/webudp/Wu.h>
+#include <network/websocket.h>
+#include <rfb/LogWriter.h>
+#include <rfb/ServerCore.h>
+#include <rfb/xxhash.h>
+
+using namespace network;
+
+static rfb::LogWriter vlog("WebUdp");
+static WuHost *host = NULL;
+
+rfb::IntParameter udpSize("udpSize", "UDP packet data size", 1300, 500, 1400);
+
+extern settings_t settings;
+
+static void udperr(const char *msg, void *) {
+	vlog.error("%s", msg);
+}
+
+static void udpdebug(const char *msg, void *) {
+	vlog.debug("%s", msg);
+}
+
+void *udpserver(void *nport) {
+
+	WuHost *myhost = NULL;
+	int ret = WuHostCreate(rfb::Server::publicIP, *(uint16_t *) nport, 16, &myhost);
+	if (ret != WU_OK) {
+		vlog.error("Failed to create WebUDP host");
+		return NULL;
+	}
+
+	__sync_bool_compare_and_swap(&host, host, myhost);
+
+	GetAPIMessager *msgr = (GetAPIMessager *) settings.messager;
+
+	WuHostSetErrorCallback(host, udperr);
+	WuHostSetDebugCallback(host, udpdebug);
+
+	while (1) {
+		WuAddress addr;
+		WuEvent e;
+		if (!WuHostServe(host, &e, 2000))
+			continue;
+
+		switch (e.type) {
+			case WuEvent_ClientJoin:
+				vlog.info("client join");
+				addr = WuClientGetAddress(e.client);
+				msgr->netUdpUpgrade(e.client, htonl(addr.host));
+			break;
+			case WuEvent_ClientLeave:
+				vlog.info("client leave");
+				WuHostRemoveClient(host, e.client);
+			break;
+			default:
+				vlog.error("client sent data, this is unexpected");
+			break;
+		}
+	}
+
+	return NULL;
+}
+
+// Send one packet, split into N UDP-sized pieces
+static uint8_t udpsend(WuClient *client, const uint8_t *data, unsigned len, uint32_t *id) {
+	const uint32_t DATA_MAX = udpSize;
+
+	uint8_t buf[1400 + sizeof(uint32_t) * 4];
+	const uint32_t pieces = (len / DATA_MAX) + ((len % DATA_MAX) ? 1 : 0);
+
+	uint32_t i;
+
+	for (i = 0; i < pieces; i++) {
+		const unsigned curlen = len > DATA_MAX ? DATA_MAX : len;
+		const uint32_t hash = XXH64(data, curlen, 0);
+
+		memcpy(buf, id, sizeof(uint32_t));
+		memcpy(&buf[4], &i, sizeof(uint32_t));
+		memcpy(&buf[8], &pieces, sizeof(uint32_t));
+		memcpy(&buf[12], &hash, sizeof(uint32_t));
+
+		memcpy(&buf[16], data, curlen);
+		data += curlen;
+		len -= curlen;
+
+		if (WuHostSendBinary(host, client, buf, curlen + sizeof(uint32_t) * 4) < 0)
+			return 1;
+	}
+
+	(*id)++;
+
+	return 0;
+}
+
+UdpStream::UdpStream(): OutStream(), client(NULL), total_len(0), id(0) {
+	ptr = data;
+	end = data + UDPSTREAM_BUFSIZE;
+
+	srand(time(NULL));
+}
+
+void UdpStream::flush() {
+	const unsigned len = ptr - data;
+	total_len += len;
+
+	if (client) {
+		if (udpsend(client, data, len, &id))
+			vlog.error("Error sending udp, client gone?");
+	} else {
+		vlog.error("Tried to send udp without a client");
+	}
+
+	ptr = data;
+}
+
+void UdpStream::overrun(size_t needed) {
+	vlog.error("Udp buffer overrun");
+	abort();
+}
+
+void wuGotHttp(const char msg[], const uint32_t msglen, char resp[]) {
+	WuGotHttp(host, msg, msglen, resp);
+}