Initial import from SVN

1 files changed, 94 insertions, 0 deletions

diff --git a/src/lib/protocols/iax.c b/src/lib/protocols/iax.c
new file mode 100644
index 000000000..d7a01b51c
--- /dev/null
+++ b/src/lib/protocols/iax.c
@@ -0,0 +1,94 @@
+/*
+ * iax.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-15 - 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_protocols.h"
+#ifdef NDPI_PROTOCOL_IAX
+
+#define NDPI_IAX_MAX_INFORMATION_ELEMENTS 15
+
+static void ndpi_int_iax_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_IAX, NDPI_REAL_PROTOCOL);
+}
+
+static void ndpi_search_setup_iax(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  u_int8_t i;
+  u_int16_t packet_len;
+
+  if (						/* 1. iax is udp based, port 4569 */
+      (packet->udp->source == htons(4569) || packet->udp->dest == htons(4569))
+      /* check for iax new packet */
+      && packet->payload_packet_len >= 12
+      /* check for dst call id == 0, do not check for highest bit (packet retransmission) */
+      // && (ntohs(get_u_int16_t(packet->payload, 2)) & 0x7FFF) == 0
+      /* check full IAX packet  */
+      && (packet->payload[0] & 0x80) != 0
+      /* outbound seq == 0 */
+      && packet->payload[8] == 0
+      /* inbound seq == 0 || 1  */
+      && (packet->payload[9] == 0 || packet->payload[9] == 0x01)
+      /*  */
+      && packet->payload[10] == 0x06
+      /* IAX type: 0-15 */
+      && packet->payload[11] <= 15) {
+
+    if (packet->payload_packet_len == 12) {
+      NDPI_LOG(NDPI_PROTOCOL_IAX, ndpi_struct, NDPI_LOG_DEBUG, "found IAX.\n");
+      ndpi_int_iax_add_connection(ndpi_struct, flow);
+      return;
+    }
+    packet_len = 12;
+    for (i = 0; i < NDPI_IAX_MAX_INFORMATION_ELEMENTS; i++) {
+      packet_len = packet_len + 2 + packet->payload[packet_len + 1];
+      if (packet_len == packet->payload_packet_len) {
+	NDPI_LOG(NDPI_PROTOCOL_IAX, ndpi_struct, NDPI_LOG_DEBUG, "found IAX.\n");
+	ndpi_int_iax_add_connection(ndpi_struct, flow);
+	return;
+      }
+      if (packet_len > packet->payload_packet_len) {
+	break;
+      }
+    }
+
+  }
+
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_IAX);
+
+}
+
+void ndpi_search_iax(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  //      struct ndpi_flow_struct       *flow=ndpi_struct->flow;
+  //      struct ndpi_id_struct         *src=ndpi_struct->src;
+  //      struct ndpi_id_struct         *dst=ndpi_struct->dst;
+
+  if(packet->udp 
+     && (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_UNKNOWN))
+    ndpi_search_setup_iax(ndpi_struct, flow);
+}
+#endif