Initial import from SVN

1 files changed, 200 insertions, 0 deletions

diff --git a/src/lib/protocols/sip.c b/src/lib/protocols/sip.c
new file mode 100644
index 000000000..201d2b23f
--- /dev/null
+++ b/src/lib/protocols/sip.c
@@ -0,0 +1,200 @@
+/*
+ * sip.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_api.h"
+
+#ifdef NDPI_PROTOCOL_SIP
+static void ndpi_int_sip_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+					struct ndpi_flow_struct *flow,
+					u_int8_t due_to_correlation)
+{
+
+  ndpi_int_add_connection(ndpi_struct, flow,
+			  NDPI_PROTOCOL_SIP,
+			  due_to_correlation ? NDPI_CORRELATED_PROTOCOL : NDPI_REAL_PROTOCOL);
+}
+
+
+	
+#if !defined(WIN32)
+static inline
+#else
+__forceinline static
+#endif
+void ndpi_search_sip_handshake(struct ndpi_detection_module_struct
+			       *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  
+  //      struct ndpi_id_struct         *src=ndpi_struct->src;
+  //      struct ndpi_id_struct         *dst=ndpi_struct->dst;
+  const u_int8_t *packet_payload = packet->payload;
+  u_int32_t payload_len = packet->payload_packet_len;
+
+
+  if (payload_len > 4) {
+    /* search for STUN Turn ChannelData Prefix */
+    u_int16_t message_len = ntohs(get_u_int16_t(packet->payload, 2));
+    if (payload_len - 4 == message_len) {
+      NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found STUN TURN ChannelData prefix.\n");
+      payload_len -= 4;
+      packet_payload += 4;
+    }
+  }
+#ifndef NDPI_PROTOCOL_YAHOO
+  if (payload_len >= 14 && packet_payload[payload_len - 2] == 0x0d && packet_payload[payload_len - 1] == 0x0a)
+#endif
+#ifdef NDPI_PROTOCOL_YAHOO
+    if (payload_len >= 14)
+#endif
+      {
+
+	if ((memcmp(packet_payload, "NOTIFY ", 7) == 0 || memcmp(packet_payload, "notify ", 7) == 0)
+	    && (memcmp(&packet_payload[7], "SIP:", 4) == 0 || memcmp(&packet_payload[7], "sip:", 4) == 0)) {
+
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip NOTIFY.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+	if ((memcmp(packet_payload, "REGISTER ", 9) == 0 || memcmp(packet_payload, "register ", 9) == 0)
+	    && (memcmp(&packet_payload[9], "SIP:", 4) == 0 || memcmp(&packet_payload[9], "sip:", 4) == 0)) {
+
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip REGISTER.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+	if ((memcmp(packet_payload, "INVITE ", 7) == 0 || memcmp(packet_payload, "invite ", 7) == 0)
+	    && (memcmp(&packet_payload[7], "SIP:", 4) == 0 || memcmp(&packet_payload[7], "sip:", 4) == 0)) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip INVITE.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+	/* seen this in second direction on the third position,
+	 * maybe it could be deleted, if somebody sees it in the first direction,
+	 * please delete this comment.
+	 */
+	
+	/*
+	if (memcmp(packet_payload, "SIP/2.0 200 OK", 14) == 0 || memcmp(packet_payload, "sip/2.0 200 OK", 14) == 0) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip SIP/2.0 0K.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+        */
+        if (memcmp(packet_payload, "SIP/2.0 ", 8) == 0 || memcmp(packet_payload, "sip/2.0 ", 8) == 0) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip SIP/2.0 *.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+        if ((memcmp(packet_payload, "BYE ", 4) == 0 || memcmp(packet_payload, "bye ", 4) == 0)
+	    && (memcmp(&packet_payload[4], "SIP:", 4) == 0 || memcmp(&packet_payload[4], "sip:", 4) == 0)) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip BYE.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+        if ((memcmp(packet_payload, "ACK ", 4) == 0 || memcmp(packet_payload, "ack ", 4) == 0)
+	    && (memcmp(&packet_payload[4], "SIP:", 4) == 0 || memcmp(&packet_payload[4], "sip:", 4) == 0)) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip ACK.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+        if ((memcmp(packet_payload, "CANCEL ", 7) == 0 || memcmp(packet_payload, "cancel ", 7) == 0)
+	    && (memcmp(&packet_payload[4], "SIP:", 7) == 0 || memcmp(&packet_payload[4], "sip:", 7) == 0)) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip CANCEL.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+
+	/* Courtesy of Miguel Quesada <mquesadab@gmail.com> */
+	if ((memcmp(packet_payload, "OPTIONS ", 8) == 0
+	     || memcmp(packet_payload, "options ", 8) == 0)
+	    && (memcmp(&packet_payload[8], "SIP:", 4) == 0
+		|| memcmp(&packet_payload[8], "sip:", 4) == 0)) {
+	  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "found sip OPTIONS.\n");
+	  ndpi_int_sip_add_connection(ndpi_struct, flow, 0);
+	  return;
+	}
+      }
+
+  /* add bitmask for tcp only, some stupid udp programs
+   * send a very few (< 10 ) packets before invite (mostly a 0x0a0x0d, but just search the first 3 payload_packets here */
+  if (packet->udp != NULL && flow->packet_counter < 20) {
+    NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "need next packet.\n");
+    return;
+  }
+#ifdef NDPI_PROTOCOL_STUN
+  /* for STUN flows we need some more packets */
+  if (packet->udp != NULL && flow->detected_protocol_stack[0] == NDPI_PROTOCOL_STUN && flow->packet_counter < 40) {
+    NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "need next STUN packet.\n");
+    return;
+  }
+#endif
+
+  if (payload_len == 4 && get_u_int32_t(packet_payload, 0) == 0) {
+    NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "maybe sip. need next packet.\n");
+    return;
+  }
+#ifdef NDPI_PROTOCOL_YAHOO
+  if (payload_len > 30 && packet_payload[0] == 0x90
+      && packet_payload[3] == payload_len - 20 && get_u_int32_t(packet_payload, 4) == 0
+      && get_u_int32_t(packet_payload, 8) == 0) {
+    flow->sip_yahoo_voice = 1;
+    NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "maybe sip yahoo. need next packet.\n");
+  }
+  if (flow->sip_yahoo_voice && flow->packet_counter < 10) {
+    return;
+  }
+#endif
+  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "exclude sip.\n");
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_SIP);
+  return;
+
+
+}
+
+void ndpi_search_sip(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;
+
+  NDPI_LOG(NDPI_PROTOCOL_SIP, ndpi_struct, NDPI_LOG_DEBUG, "sip detection...\n");
+
+  /* skip marked packets */
+  if (packet->detected_protocol_stack[0] != NDPI_PROTOCOL_SIP) {
+    if (packet->tcp_retransmission == 0) {
+      ndpi_search_sip_handshake(ndpi_struct, flow);
+    }
+  }
+}
+
+#endif