Added MPEG-DASH dissector. Fixes #1223. (#1555)

* Improved HTTP POST detection
 * Refactored subprotocol detection

Signed-off-by: lns <matzeton@googlemail.com>

1 files changed, 96 insertions, 0 deletions

diff --git a/src/lib/protocols/mpegdash.c b/src/lib/protocols/mpegdash.c
new file mode 100644
index 000000000..bc6fc8d44
--- /dev/null
+++ b/src/lib/protocols/mpegdash.c
@@ -0,0 +1,96 @@
+/*
+ * mpegdash.c
+ *
+ * Copyright (C) 2022 - ntop.org
+ *
+ * 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_MPEGDASH
+
+#include "ndpi_api.h"
+
+
+static void ndpi_int_mpegdash_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                             struct ndpi_flow_struct *flow)
+{
+  ndpi_set_detected_protocol(ndpi_struct, flow, flow->guessed_host_protocol_id,
+                             NDPI_PROTOCOL_MPEGDASH, NDPI_CONFIDENCE_DPI);
+}
+
+void ndpi_search_mpegdash_http(struct ndpi_detection_module_struct *ndpi_struct,
+                               struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "search MpegDash\n");
+
+  if (flow->detected_protocol_stack[0] != NDPI_PROTOCOL_HTTP &&
+      flow->detected_protocol_stack[1] != NDPI_PROTOCOL_HTTP)
+  {
+    if (flow->packet_counter > 2)
+    {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    }
+    return;
+  }
+
+  if (packet->parsed_lines == 0)
+  {
+    ndpi_parse_packet_line_info(ndpi_struct, flow);
+  }
+
+  if (packet->parsed_lines > 0)
+  {
+    if (LINE_ENDS(packet->line[0], "RTSP/1.0") != 0 ||
+        LINE_ENDS(packet->line[0], ".mp4 HTTP/1.1") != 0 ||
+        LINE_ENDS(packet->line[0], ".m4s HTTP/1.1") != 0)
+    {
+      ndpi_int_mpegdash_add_connection(ndpi_struct, flow);
+      return;
+    }
+
+    for (size_t i = 0; i < packet->parsed_lines && packet->line[i].len > 0; ++i)
+    {
+      if ((LINE_STARTS(packet->line[i], "Content-Type:") != 0 &&
+           LINE_ENDS(packet->line[i], "video/mp4") != 0) ||
+          LINE_STARTS(packet->line[i], "DASH") != 0)
+      {
+        ndpi_int_mpegdash_add_connection(ndpi_struct, flow);
+        return;
+      }
+    }
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+  return;
+}
+
+void init_mpegdash_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                             u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("MpegDash", ndpi_struct, detection_bitmask, *id,
+				      NDPI_PROTOCOL_MPEGDASH,
+				      ndpi_search_mpegdash_http,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+  *id += 1;
+}