1 files changed, 93 insertions, 0 deletions
diff --git a/src/lib/protocols/citrix.c b/src/lib/protocols/citrix.c
new file mode 100644
index 000000000..1cae9f9e5
--- /dev/null
+++ b/src/lib/protocols/citrix.c
@@ -0,0 +1,93 @@
+/*
+ * citrix.c
+ *
+ * Copyright (C) 2012-15 - 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_api.h"
+
+#ifdef NDPI_PROTOCOL_CITRIX
+
+/* ************************************ */
+
+static void ndpi_check_citrix(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  u_int32_t payload_len = packet->payload_packet_len;
+
+#if 0
+  printf("[len=%u][%02X %02X %02X %02X]\n", payload_len,
+	 packet->payload[0] & 0xFF,
+	 packet->payload[1] & 0xFF,
+	 packet->payload[2] & 0xFF,
+	 packet->payload[3] & 0xFF);
+#endif
+
+  if(packet->tcp != NULL) {
+    flow->l4.tcp.citrix_packet_id++;
+    
+    if((flow->l4.tcp.citrix_packet_id == 3)
+       /* We have seen the 3-way handshake */
+       && flow->l4.tcp.seen_syn
+       && flow->l4.tcp.seen_syn_ack
+       && flow->l4.tcp.seen_ack) {
+      if(payload_len == 6) {
+	char citrix_header[] = { 0x07, 0x07, 0x49, 0x43, 0x41, 0x00 };
+	
+	if(memcmp(packet->payload, citrix_header, sizeof(citrix_header)) == 0) {
+	  NDPI_LOG(NDPI_PROTOCOL_CITRIX, ndpi_struct, NDPI_LOG_DEBUG, "Found citrix.\n");
+	  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_CITRIX, NDPI_REAL_PROTOCOL);
+	}
+
+	return;
+      } else if(payload_len > 4) {
+	char citrix_header[] = { 0x1a, 0x43, 0x47, 0x50, 0x2f, 0x30, 0x31 };
+	
+	if((memcmp(packet->payload, citrix_header, sizeof(citrix_header)) == 0)
+	   || (ndpi_strnstr((const char *)packet->payload, "Citrix.TcpProxyService", payload_len) != NULL)) {
+	  NDPI_LOG(NDPI_PROTOCOL_CITRIX, ndpi_struct, NDPI_LOG_DEBUG, "Found citrix.\n");
+	  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_CITRIX, NDPI_REAL_PROTOCOL);
+	}
+
+	return;	
+      }
+      
+      
+      NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CITRIX);
+    } else if(flow->l4.tcp.citrix_packet_id > 3)
+      NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_CITRIX);
+    
+    return;
+  }
+}
+
+void ndpi_search_citrix(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+
+  NDPI_LOG(NDPI_PROTOCOL_CITRIX, ndpi_struct, NDPI_LOG_DEBUG, "citrix detection...\n");
+
+  /* skip marked packets */
+  if(packet->detected_protocol_stack[0] != NDPI_PROTOCOL_CITRIX)
+    ndpi_check_citrix(ndpi_struct, flow);
+}
+
+#endif