1 files changed, 97 insertions, 0 deletions
diff --git a/src/lib/protocols/h323.c b/src/lib/protocols/h323.c
new file mode 100644
index 000000000..9d2fac8c8
--- /dev/null
+++ b/src/lib/protocols/h323.c
@@ -0,0 +1,97 @@
+/*
+ * h323.c
+ *
+ * Copyright (C) 2015 ntop.org
+ * Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
+ *
+ */
+
+
+#include "ndpi_protocols.h"
+
+#ifdef NDPI_PROTOCOL_H323
+
+struct tpkt {
+  u_int8_t version, reserved;
+  u_int16_t len;
+};
+
+void ndpi_search_h323(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  u_int16_t dport = 0, sport = 0;
+
+  NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "search H323.\n");
+
+  if(packet->tcp != NULL) {
+    NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "calculated dport over tcp.\n");
+
+    /* H323  */
+    if((packet->payload[0] == 0x03)
+       && (packet->payload[1] == 0x00)
+       && (packet->payload[2] == 0x00)) {
+	struct tpkt *t = (struct tpkt*)packet->payload;
+	u_int16_t len = ntohs(t->len);
+
+	if(packet->payload_packet_len == len) {
+	  /*
+	    We need to check if this packet is in reality
+	    a RDP (Remote Desktop) packet encapsulated on TPTK
+	   */
+
+	  if(packet->payload[4] == (packet->payload_packet_len - sizeof(struct tpkt) - 1)) {
+	    /* ISO 8073/X.224 */
+	    if((packet->payload[5] == 0xE0 /* CC Connect Request */)
+	       || (packet->payload[5] == 0xD0 /* CC Connect Confirm */)) {
+	      ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_RDP, NDPI_REAL_PROTOCOL);
+	      return;
+	    }
+	  }
+
+	  flow->l4.tcp.h323_valid_packets++;
+
+	  if(flow->l4.tcp.h323_valid_packets >= 2) {
+	    NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "found H323 broadcast.\n");
+	    ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_H323, NDPI_REAL_PROTOCOL);
+	  }
+	} else {
+	  /* This is not H.323 */
+	  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_H323);
+	}
+      }    
+  } else if(packet->udp != NULL) {
+    sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
+    NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "calculated dport over udp.\n");
+
+    if(packet->payload[0] == 0x80 && packet->payload[1] == 0x08 && (packet->payload[2] == 0xe7 || packet->payload[2] == 0x26) &&
+       packet->payload[4] == 0x00 && packet->payload[5] == 0x00)
+      {
+	NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "found H323 broadcast.\n");
+	ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_H323, NDPI_REAL_PROTOCOL);
+	return;
+      }
+    /* H323  */
+    if(sport == 1719 || dport == 1719)
+      {
+        if(packet->payload[0] == 0x16 && packet->payload[1] == 0x80 && packet->payload[4] == 0x06 && packet->payload[5] == 0x00)
+	  {
+	    NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "found H323 broadcast.\n");
+	    ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_H323, NDPI_REAL_PROTOCOL);
+	    return;
+	  }
+        else if(packet->payload_packet_len >= 20 || packet->payload_packet_len <= 117)
+	  {
+	    NDPI_LOG(NDPI_PROTOCOL_H323, ndpi_struct, NDPI_LOG_DEBUG, "found H323 broadcast.\n");
+	    ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_H323, NDPI_REAL_PROTOCOL);
+	    return;
+	  }
+        else
+	  {
+	    NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_H323);
+	    return;
+	  }
+      }
+  }
+
+}
+#endif