Initial import from SVN

1 files changed, 93 insertions, 0 deletions

diff --git a/src/lib/protocols/netflow.c b/src/lib/protocols/netflow.c
new file mode 100644
index 000000000..ccf275a8b
--- /dev/null
+++ b/src/lib/protocols/netflow.c
@@ -0,0 +1,93 @@
+/*
+ * netflow.c
+ *
+ * Copyright (C) 2011-15 - ntop.org
+ *
+ * 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_NETFLOW
+
+#ifndef __KERNEL__
+#ifdef WIN32
+extern int gettimeofday(struct timeval * tp, struct timezone * tzp);
+#endif
+#define do_gettimeofday(a) gettimeofday(a, NULL)
+#endif
+
+static void ndpi_check_netflow(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  // const u_int8_t *packet_payload = packet->payload;
+  u_int32_t payload_len = packet->payload_packet_len;
+  time_t now;
+  struct timeval now_tv;
+
+  if((packet->udp != NULL) && (payload_len >= 24)) {
+    u_int16_t version = (packet->payload[0] << 8) + packet->payload[1], uptime_offset;
+    u_int32_t when, *_when;
+    u_int16_t n = (packet->payload[2] << 8) + packet->payload[3];
+
+    switch(version) {
+    case 1:
+    case 5:
+    case 7:
+    case 9:
+      {      
+	u_int16_t num_flows = n;
+
+	if((num_flows == 0) || (num_flows > 30))
+	  return;
+      }
+      uptime_offset = 8;
+      break;
+    case 10: /* IPFIX */
+      {      
+	u_int16_t ipfix_len = n;
+
+	if(ipfix_len != payload_len)
+	  return;
+      }    
+      uptime_offset = 4;
+      break;
+    default:
+      return;
+    }
+
+    _when = (u_int32_t*)&packet->payload[uptime_offset]; /* Sysuptime */
+    when = ntohl(*_when);
+
+    do_gettimeofday(&now_tv);
+    now = now_tv.tv_sec;
+
+    if(((version == 1) && (when == 0))
+       || ((when >= 946684800 /* 1/1/2000 */) && (when <= now))) {
+      NDPI_LOG(NDPI_PROTOCOL_NETFLOW, ndpi_struct, NDPI_LOG_DEBUG, "Found netflow.\n");
+      ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_NETFLOW, NDPI_REAL_PROTOCOL);
+      return;
+    }
+  }
+}
+
+void ndpi_search_netflow(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  NDPI_LOG(NDPI_PROTOCOL_NETFLOW, ndpi_struct, NDPI_LOG_DEBUG, "netflow detection...\n");
+  ndpi_check_netflow(ndpi_struct, flow);
+}
+
+#endif