New dissector: Nest Log Sink

This is a dissector for the Nest Log Sink protocol which is used by the Nest Protect (https://nest.com/ca/smoke-co-alarm/overview/).

Signed-off-by: Darryl Sokoloski <darryl@sokoloski.ca>

1 files changed, 81 insertions, 0 deletions

diff --git a/src/lib/protocols/nest_log_sink.c b/src/lib/protocols/nest_log_sink.c
new file mode 100644
index 000000000..47cc65dc8
--- /dev/null
+++ b/src/lib/protocols/nest_log_sink.c
@@ -0,0 +1,81 @@
+/*
+ * nest_log_sink.c
+ *
+ * Copyright (C) 2009-2011 by ipoque GmbH
+ * Copyright (C) 2011-18 - ntop.org
+ * Copyright (C) 2018 - eGloo Incorporated
+ *
+ * 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_protocol_ids.h"
+
+#define NDPI_CURRENT_PROTO      NDPI_PROTOCOL_NEST_LOG_SINK
+
+#include "ndpi_api.h"
+
+#define NEST_LOG_SINK_PORT          11095
+#define NEST_LOG_SINK_MIN_LEN       8
+#define NEST_LOG_SINK_MIN_MATCH     3
+
+void ndpi_search_nest_log_sink(
+        struct ndpi_detection_module_struct *ndpi_struct,
+        struct ndpi_flow_struct *flow)
+{
+    struct ndpi_packet_struct *packet = &flow->packet;
+    const u_int8_t *offset = packet->payload;
+    u_int8_t *matches;
+
+    NDPI_LOG_DBG(ndpi_struct, "search nest_log_sink\n");
+
+    if (packet->payload_packet_len < NEST_LOG_SINK_MIN_LEN) {
+        NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+        return;
+    }
+
+    if (ntohs(packet->tcp->source) != NEST_LOG_SINK_PORT &&
+            ntohs(packet->tcp->dest) != NEST_LOG_SINK_PORT) {
+        NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+        return;
+    }
+
+    if (packet->payload[1] <= 0x02 &&
+            (packet->payload[2] == 0x00 || packet->payload[2] == 0x10) &&
+            packet->payload[3] == 0x13)
+        flow->l4.tcp.nest_log_sink_matches++;
+
+    if (flow->l4.tcp.nest_log_sink_matches == NEST_LOG_SINK_MIN_MATCH) {
+        NDPI_LOG_INFO(ndpi_struct, "found nest_log_sink\n");
+        ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_NEST_LOG_SINK, NDPI_PROTOCOL_UNKNOWN);
+    }
+}
+
+void init_nest_log_sink_dissector(
+        struct ndpi_detection_module_struct *ndpi_struct,
+        u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+    ndpi_set_bitmask_protocol_detection("NEST_LOG_SINK",
+            ndpi_struct, detection_bitmask, *id,
+            NDPI_PROTOCOL_NEST_LOG_SINK,
+            ndpi_search_nest_log_sink,
+            NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD,
+            SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+            ADD_TO_DETECTION_BITMASK);
+
+    *id += 1;
+}