1 files changed, 69 insertions, 0 deletions
diff --git a/src/lib/protocols/openvpn.c b/src/lib/protocols/openvpn.c
new file mode 100644
index 000000000..df13356ff
--- /dev/null
+++ b/src/lib/protocols/openvpn.c
@@ -0,0 +1,69 @@
+/*
+ * h323.c
+ *
+ * Copyright (C) 2013 Remy Mudingay <mudingay@ill.fr>
+ *
+ */
+
+#include "ndpi_api.h"
+
+
+#ifdef NDPI_PROTOCOL_OPENVPN
+
+void ndpi_search_openvpn(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;
+
+  if (packet->udp != NULL) {
+
+    sport = ntohs(packet->udp->source), dport = ntohs(packet->udp->dest);
+
+    if ((packet->payload_packet_len >= 25) && (sport == 443 || dport == 443) &&
+        (packet->payload[0] == 0x17 && packet->payload[1] == 0x01 &&
+         packet->payload[2] == 0x00 && packet->payload[3] == 0x00)) {
+      NDPI_LOG(NDPI_PROTOCOL_OPENVPN, ndpi_struct, NDPI_LOG_DEBUG,
+               "found openvpn udp 443.\n");
+      ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_OPENVPN,
+                              NDPI_REAL_PROTOCOL);
+      return;
+    }
+
+    if ( ( (packet->payload_packet_len > 40)   ||
+           (packet->payload_packet_len <= 14) ) &&  // hard-reset
+        (sport == 1194 || dport == 1194) &&
+        (packet->payload[0] == 0x30 || packet->payload[0] == 0x31 ||
+         packet->payload[0] == 0x32 || packet->payload[0] == 0x33 ||
+         packet->payload[0] == 0x34 || packet->payload[0] == 0x35 ||
+         packet->payload[0] == 0x36 || packet->payload[0] == 0x37 ||
+         packet->payload[0] == 0x38 || packet->payload[0] == 0x39)) {
+      NDPI_LOG(NDPI_PROTOCOL_OPENVPN, ndpi_struct, NDPI_LOG_DEBUG,
+               "found openvpn broadcast udp STD.\n");
+      ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_OPENVPN,
+                              NDPI_REAL_PROTOCOL);
+      return;
+    }
+
+  }
+
+  if (packet->tcp != NULL) {
+
+    sport = ntohs(packet->tcp->source), dport = ntohs(packet->tcp->dest);
+
+    if ((packet->payload_packet_len >= 40) &&
+        (sport == 1194 || dport == 1194) &&
+        ((packet->payload[0] == 0x00) && (packet->payload[1] == 0x2a) &&
+         (packet->payload[2] == 0x38))) {
+      NDPI_LOG(NDPI_PROTOCOL_OPENVPN, ndpi_struct, NDPI_LOG_DEBUG,
+               "found openvpn broadcast udp STD.\n");
+      ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_OPENVPN,
+                              NDPI_REAL_PROTOCOL);
+      return;
+    }
+  }
+
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask,
+                               NDPI_PROTOCOL_OPENVPN);
+}
+
+#endif