✨ feat(integration decoders): http and glimpse_detector

compile pass, todo test

decoders/glimpse_detector/libprotoident/tcp/lpi_douyu.cc

@@ -0,0 +1,109 @@
+/*
+ *
+ * Copyright (c) 2011-2016 The University of Waikato, Hamilton, New Zealand.
+ * All rights reserved.
+ *
+ * This file is part of libprotoident.
+ *
+ * This code has been developed by the University of Waikato WAND
+ * research group. For further information please see http://www.wand.net.nz/
+ *
+ * libprotoident is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * libprotoident 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *
+ */
+
+#include <string.h>
+
+#include "libprotoident.h"
+#include "proto_manager.h"
+#include "proto_common.h"
+
+/* This is a classic 4-byte length protocol, but there is plenty of
+ * scope for the packet sizes to vary a bit so we can't just look for
+ * a specific combo of packet sizes */
+
+static inline bool match_douyu_req(uint32_t payload, uint32_t len) {
+
+        uint32_t plen = bswap_le_to_host32(payload);
+
+        /* Packet usually contains a username and a password so
+         * can probably vary quite a bit in size */
+        if (plen == len - 4) {
+                if (len <= 255)
+                        return true;
+        }
+
+        return false;
+}
+
+static inline bool match_douyu_reply(uint32_t payload, uint32_t len) {
+
+        uint32_t plen = bswap_le_to_host32(payload);
+
+        /* Response packets seem like they will vary a lot less in
+         * size -- could be wrong though */
+
+        if (plen == len - 4) {
+                if (len >= 225 && len <= 255)
+                        return true;
+        }
+
+        return false;
+}
+
+static inline bool match_douyu_port(uint16_t port) {
+
+        /* Based purely on observed flows, rather than any docs */
+        if (port >= 8601 && port <= 8605)
+                return true;
+        if (port >= 12601 && port <= 12605)
+                return true;
+        return false;
+}
+
+static inline bool match_douyu(lpi_data_t *data, lpi_module_t *mod UNUSED) {
+
+        /* Tends to use a couple of different port ranges */
+        if (!match_douyu_port(data->server_port) && 
+                        !match_douyu_port(data->client_port)) {
+                return false;
+        }
+
+        if (match_douyu_req(data->payload[0], data->payload_len[0])) {
+                if (match_douyu_reply(data->payload[1], data->payload_len[1]))
+                        return true;
+        }
+
+        if (match_douyu_req(data->payload[1], data->payload_len[1])) {
+                if (match_douyu_reply(data->payload[0], data->payload_len[0]))
+                        return true;
+        }
+
+
+	return false;
+}
+
+static lpi_module_t lpi_douyu = {
+	LPI_PROTO_DOUYU,
+	LPI_CATEGORY_STREAMING,
+	"Douyu",
+	249,
+	match_douyu
+};
+
+void register_douyu(LPIModuleMap *mod_map) {
+	register_protocol(&lpi_douyu, mod_map);
+}
+