Remove PPStream protocol and add iQIYI (#2403)

P2P video player PPStream was discontinued shortly after the purchase of PPS.tv by Baidu (iQIYI) on 2013 (see https://www.techinasia.com/report-baidu-acquires-video-rival-pps)
So we remove the old `NDPI_PROTOCOL_PPSTREAM` logic and add `NDPI_PROTOCOL_IQIYI` id to handle all the iQIYI traffic, which is basically video streaming traffic.

A video hosting service, called PPS.tv, is still offered by the same company: for the time being we classified both services with the same protocol id.

1 files changed, 69 insertions, 0 deletions

diff --git a/src/lib/protocols/iqiyi.c b/src/lib/protocols/iqiyi.c
new file mode 100644
index 000000000..28600a4fc
--- /dev/null
+++ b/src/lib/protocols/iqiyi.c
@@ -0,0 +1,69 @@
+/*
+ * iqiyi.c
+ *
+ * Copyright (C) 2024 - ntop.org
+ * Copyright (C) 2024 - V.G <v.gavrilov@securitycode.ru>
+ *
+ * This file is part of nDPI, an open source deep packet inspection
+ * library based on the OpenDPI and PACE technology by ipoque GmbH
+ *
+ * nDPI 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.
+ *
+ * nDPI 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 nDPI.  If not, see <http://www.gnu.org/licenses/>.
+ * 
+ */
+
+#include "ndpi_protocol_ids.h"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_IQIYI
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_int_iqiyi_add_connection(struct ndpi_detection_module_struct *ndpi_struct, 
+                                          struct ndpi_flow_struct *flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found iQIYI\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_IQIYI,
+                             NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_iqiyi(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "search iQIYI\n");
+
+  if (packet->payload_packet_len > 120 && packet->payload_packet_len < 300) {
+    if (ndpi_memmem(packet->payload, packet->payload_packet_len, "PPStream", NDPI_STATICSTRING_LEN("PPStream"))) {
+      ndpi_int_iqiyi_add_connection(ndpi_struct, flow);
+      return;
+    }
+  }
+
+  /* Add more iQiyi signatures */
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_iqiyi_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                                         u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("iQIYI", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_IQIYI,
+                                      ndpi_search_iqiyi,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}