Added EAQ protocol support

1 files changed, 68 insertions, 0 deletions

diff --git a/src/lib/protocols/eaq.c b/src/lib/protocols/eaq.c
new file mode 100644
index 000000000..0fe47ab6f
--- /dev/null
+++ b/src/lib/protocols/eaq.c
@@ -0,0 +1,68 @@
+/*
+ * eaq.c
+ *
+ * Copyright (C) 2015 - 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 "ndpi_api.h"
+
+#define EAQ_DEFAULT_PORT   6000
+#define EAQ_DEFAULT_SIZE     16
+
+#ifdef NDPI_PROTOCOL_EAQ
+static void ndpi_int_eaq_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+					struct ndpi_flow_struct *flow) {
+  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_EAQ, NDPI_REAL_PROTOCOL);
+}
+
+
+void ndpi_search_eaq(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow) {
+  struct ndpi_packet_struct *packet = &flow->packet;
+  u_int16_t sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
+  unsigned char *vers;
+  int ver_offs;
+  
+  if((packet->payload_packet_len != EAQ_DEFAULT_SIZE)
+     || ((sport != EAQ_DEFAULT_PORT) && (dport != EAQ_DEFAULT_PORT))) {
+  exclude_eaq:
+    NDPI_LOG(NDPI_PROTOCOL_EAQ, ndpi_struct, NDPI_LOG_DEBUG, "Exclude eaq.\n");
+    NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_EAQ);
+    return;
+  }
+
+  if(packet->udp != NULL) {
+    u_int32_t seq = (packet->payload[0] * 1000) + (packet->payload[1] * 100) + (packet->payload[2] * 10) + packet->payload[3];
+    
+    if(flow->l4.udp.eaq_pkt_id == 0)
+      flow->l4.udp.eaq_sequence = seq;
+    else {
+      if((flow->l4.udp.eaq_sequence == seq) || ((flow->l4.udp.eaq_sequence+1) == seq)) {
+	; /* Looks good */
+      } else
+	goto exclude_eaq;
+    }
+
+    if(++flow->l4.udp.eaq_pkt_id == 4) {
+      /* We have collected enough packets so we assume it's EAQ */
+      NDPI_LOG(NDPI_PROTOCOL_EAQ, ndpi_struct, NDPI_LOG_DEBUG, "found eaq.\n");
+      ndpi_int_eaq_add_connection(ndpi_struct, flow);
+    }
+  } else
+    goto exclude_eaq;
+}
+#endif