Initial import from SVN

1 files changed, 118 insertions, 0 deletions

diff --git a/src/lib/protocols/battlefield.c b/src/lib/protocols/battlefield.c
new file mode 100644
index 000000000..374dcb61b
--- /dev/null
+++ b/src/lib/protocols/battlefield.c
@@ -0,0 +1,118 @@
+/*
+ * battlefield.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_BATTLEFIELD
+
+
+static void ndpi_int_battlefield_add_connection(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  struct ndpi_id_struct *src = flow->src;
+  struct ndpi_id_struct *dst = flow->dst;
+
+  ndpi_int_add_connection(ndpi_struct, flow, NDPI_PROTOCOL_BATTLEFIELD, NDPI_REAL_PROTOCOL);
+
+  if (src != NULL) {
+    src->battlefield_ts = packet->tick_timestamp;
+  }
+  if (dst != NULL) {
+    dst->battlefield_ts = packet->tick_timestamp;
+  }
+}
+
+void ndpi_search_battlefield(struct ndpi_detection_module_struct *ndpi_struct, struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &flow->packet;
+  
+  struct ndpi_id_struct *src = flow->src;
+  struct ndpi_id_struct *dst = flow->dst;
+
+  if (packet->detected_protocol_stack[0] == NDPI_PROTOCOL_BATTLEFIELD) {
+    if (src != NULL && ((u_int32_t)
+			(packet->tick_timestamp - src->battlefield_ts) < ndpi_struct->battlefield_timeout)) {
+      NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG,
+	       "battlefield : save src connection packet detected\n");
+      src->battlefield_ts = packet->tick_timestamp;
+    } else if (dst != NULL && ((u_int32_t)
+			       (packet->tick_timestamp - dst->battlefield_ts) < ndpi_struct->battlefield_timeout)) {
+      NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG,
+	       "battlefield : save dst connection packet detected\n");
+      dst->battlefield_ts = packet->tick_timestamp;
+    }
+    return;
+  }
+
+  if (NDPI_SRC_OR_DST_HAS_PROTOCOL(src, dst, NDPI_PROTOCOL_BATTLEFIELD)) {
+    if (flow->l4.udp.battlefield_stage == 0 || flow->l4.udp.battlefield_stage == 1 + packet->packet_direction) {
+      if (packet->payload_packet_len > 8 && get_u_int16_t(packet->payload, 0) == htons(0xfefd)) {
+	flow->l4.udp.battlefield_msg_id = get_u_int32_t(packet->payload, 2);
+	flow->l4.udp.battlefield_stage = 1 + packet->packet_direction;
+	return;
+      }
+    } else if (flow->l4.udp.battlefield_stage == 2 - packet->packet_direction) {
+      if (packet->payload_packet_len > 8 && get_u_int32_t(packet->payload, 0) == flow->l4.udp.battlefield_msg_id) {
+	NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct,
+		 NDPI_LOG_DEBUG, "Battlefield message and reply detected.\n");
+	ndpi_int_battlefield_add_connection(ndpi_struct, flow);
+	return;
+      }
+    }
+  }
+
+  if (flow->l4.udp.battlefield_stage == 0) {
+    if (packet->payload_packet_len == 46 && packet->payload[2] == 0 && packet->payload[4] == 0
+	&& get_u_int32_t(packet->payload, 7) == htonl(0x98001100)) {
+      flow->l4.udp.battlefield_stage = 3 + packet->packet_direction;
+      return;
+    }
+  } else if (flow->l4.udp.battlefield_stage == 4 - packet->packet_direction) {
+    if (packet->payload_packet_len == 7
+	&& (packet->payload[0] == 0x02 || packet->payload[packet->payload_packet_len - 1] == 0xe0)) {
+      NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG,
+	       "Battlefield message and reply detected.\n");
+      ndpi_int_battlefield_add_connection(ndpi_struct, flow);
+      return;
+    }
+  }
+
+  if (packet->payload_packet_len == 18 && memcmp(&packet->payload[5], "battlefield2\x00", 13) == 0) {
+    NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG, "Battlefield 2 hello packet detected.\n");
+    ndpi_int_battlefield_add_connection(ndpi_struct, flow);
+    return;
+  } else if (packet->payload_packet_len > 10 &&
+	     (memcmp(packet->payload, "\x11\x20\x00\x01\x00\x00\x50\xb9\x10\x11", 10) == 0
+	      || memcmp(packet->payload, "\x11\x20\x00\x01\x00\x00\x30\xb9\x10\x11", 10) == 0
+	      || memcmp(packet->payload, "\x11\x20\x00\x01\x00\x00\xa0\x98\x00\x11", 10) == 0)) {
+    NDPI_LOG(NDPI_PROTOCOL_BATTLEFIELD, ndpi_struct, NDPI_LOG_DEBUG, "Battlefield safe pattern detected.\n");
+    ndpi_int_battlefield_add_connection(ndpi_struct, flow);
+    return;
+  }
+
+  NDPI_ADD_PROTOCOL_TO_BITMASK(flow->excluded_protocol_bitmask, NDPI_PROTOCOL_BATTLEFIELD);
+  return;
+}
+
+#endif