Initial Zoom detection based on IP and ports.

Following IP and ports are reported by Zoom support
to open up in firewall.

https://support.zoom.us/hc/en-us/articles/201362683-Network-Firewall-or-Proxy-Server-Settings-for-Zoom

Signed-off-by: Ravi Kerur <ravi.kerur@viasat.com>

1 files changed, 130 insertions, 0 deletions

diff --git a/src/lib/protocols/zoom.c b/src/lib/protocols/zoom.c
new file mode 100644
index 000000000..341fb1c0f
--- /dev/null
+++ b/src/lib/protocols/zoom.c
@@ -0,0 +1,130 @@
+/*
+ * zoom.c
+ *
+ * Copyright (C) 2018 by 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_ZOOM
+
+#include "ndpi_api.h"
+
+static u_int8_t is_zoom_tcp_port(struct ndpi_flow_struct *flow) {
+
+  struct ndpi_packet_struct *packet = &flow->packet;
+  u_int16_t dport = ntohs(packet->tcp->dest);
+
+  if((dport == 8801) || (dport == 8802) || (dport == 5090) || (dport == 5091)){
+    return 1;
+  }
+  return 0;
+}
+
+static u_int8_t is_zoom_udp_port(struct ndpi_flow_struct *flow) {
+
+  struct ndpi_packet_struct *packet = &flow->packet;
+  u_int16_t dport = ntohs(packet->tcp->dest);
+
+  if((dport == 3478) || (dport == 3479) || (dport == 5090) ||
+     (dport >= 8801 && dport <= 8810) || (dport >= 20000 && dport <= 64000)){
+    return 1;
+  }
+  return 0;
+}
+
+static u_int8_t zoom_ptree_match(struct ndpi_detection_module_struct *ndpi_struct, struct in_addr *pin) {
+  return((ndpi_network_ptree_match(ndpi_struct, pin) == NDPI_PROTOCOL_ZOOM) ? 1 : 0);
+}
+
+/* ******************************************* */
+
+static u_int8_t is_zoom_flow(struct ndpi_detection_module_struct *ndpi_struct,
+                             struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  if(packet->iph) {
+    struct in_addr daddr;
+
+    daddr.s_addr = packet->iph->daddr;
+
+    if(zoom_ptree_match(ndpi_struct, &daddr)) {
+      return(1);
+    }
+  }
+
+  return(0);
+}
+
+static void ndpi_check_zoom(struct ndpi_detection_module_struct *ndpi_struct,
+				  struct ndpi_flow_struct *flow) {
+
+  struct ndpi_packet_struct *packet = &flow->packet;
+    
+  NDPI_LOG_DBG(ndpi_struct, "search Zoom video \n");
+
+  if(packet->tcp != NULL)
+    {
+      if (is_zoom_flow(ndpi_struct, flow) && is_zoom_tcp_port(flow)){
+        NDPI_LOG_INFO(ndpi_struct, "found zoom on tcp\n");
+
+        ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ZOOM,
+                                   NDPI_PROTOCOL_UNKNOWN);
+        return;
+      }
+    }
+  else if(packet->udp != NULL)
+    {
+      if (is_zoom_flow(ndpi_struct, flow) && is_zoom_udp_port(flow)){
+        NDPI_LOG_INFO(ndpi_struct, "found zoom on udp\n");
+
+        ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_ZOOM,
+                                   NDPI_PROTOCOL_UNKNOWN);
+        return;
+      }
+    }
+  else
+    {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    }
+}
+
+void ndpi_search_zoom(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "search zoom\n");
+
+  /* skip marked packets */
+  if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_ZOOM)
+    ndpi_check_zoom(ndpi_struct, flow);
+}
+
+
+void init_zoom_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("Zoom", ndpi_struct, detection_bitmask, *id,
+				      NDPI_PROTOCOL_ZOOM,
+				      ndpi_search_zoom,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_TCP_OR_UDP_WITH_PAYLOAD,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+  *id += 1;
+}