1 files changed, 106 insertions, 0 deletions
diff --git a/src/lib/protocols/hangout.c b/src/lib/protocols/hangout.c
new file mode 100644
index 000000000..eb6566220
--- /dev/null
+++ b/src/lib/protocols/hangout.c
@@ -0,0 +1,106 @@
+/*
+ * git.c
+ *
+ * Copyright (C) 2012-16 - ntop.org
+ *
+ * This module 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.
+ *
+ * This module 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.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+#include <stdlib.h>
+#include "ndpi_api.h"
+
+#ifdef NDPI_SERVICE_HANGOUT
+
+/* https://support.google.com/a/answer/1279090?hl=en */
+#define HANGOUT_UDP_LOW_PORT  19302
+#define HANGOUT_UDP_HIGH_PORT 19309
+#define HANGOUT_TCP_LOW_PORT  19305
+#define HANGOUT_TCP_HIGH_PORT 19309
+
+/* ***************************************************************** */
+
+static u_int8_t isHangoutUDPPort(u_int16_t port) {
+  if((port >= HANGOUT_UDP_LOW_PORT) && (port <= HANGOUT_UDP_HIGH_PORT))
+    return(1);
+  else
+    return(0);
+}
+
+/* ***************************************************************** */
+
+static u_int8_t isHangoutTCPPort(u_int16_t port) {
+  if((port >= HANGOUT_TCP_LOW_PORT) && (port <= HANGOUT_TCP_HIGH_PORT))
+    return(1);
+  else
+    return(0);
+}
+
+/* ******************************************* */
+
+static u_int8_t google_ptree_match(struct ndpi_detection_module_struct *ndpi_struct, struct in_addr *pin) {
+  return((ndpi_network_ptree_match(ndpi_struct, pin) == NDPI_SERVICE_GOOGLE) ? 1 : 0);
+}
+
+/* ******************************************* */
+
+static u_int8_t is_google_flow(struct ndpi_detection_module_struct *ndpi_struct,
+			       struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &flow->packet;
+  
+  if(packet->iph) {
+    if(google_ptree_match(ndpi_struct, (struct in_addr *)&packet->iph->saddr)
+       || google_ptree_match(ndpi_struct, (struct in_addr *)&packet->iph->daddr)) {
+      return(1);
+    }
+  }
+
+  return(0);
+}
+
+/* ***************************************************************** */
+
+void ndpi_search_hangout(struct ndpi_detection_module_struct *ndpi_struct,
+			 struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct * packet = &flow->packet;
+
+  if((packet->payload_packet_len > 24) && is_google_flow(ndpi_struct, flow)) {
+    if(
+       ((packet->udp != NULL) && (isHangoutUDPPort(ntohs(packet->udp->source)) || isHangoutUDPPort(ntohs(packet->udp->dest))))
+       ||
+       ((packet->tcp != NULL) && (isHangoutTCPPort(ntohs(packet->tcp->source)) || isHangoutTCPPort(ntohs(packet->tcp->dest))))) {
+      NDPI_LOG(NDPI_SERVICE_HANGOUT, ndpi_struct, NDPI_LOG_DEBUG, "Found Hangout.\n");
+      ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_SERVICE_HANGOUT, NDPI_PROTOCOL_UNKNOWN);
+      return;
+    }
+  }
+  
+  NDPI_LOG(NDPI_SERVICE_HANGOUT, ndpi_struct, NDPI_LOG_DEBUG, "No Hangout.\n");
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_SERVICE_HANGOUT);
+}
+
+/* ***************************************************************** */
+
+void init_hangout_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
+			    NDPI_PROTOCOL_BITMASK *detection_bitmask) {
+  ndpi_set_bitmask_protocol_detection("GoogleHangout", ndpi_struct, detection_bitmask, *id,
+				      NDPI_SERVICE_HANGOUT,
+				      ndpi_search_hangout,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_TCP_OR_UDP,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+
+#endif /* NDPI_SERVICE_HANGOUT */