Add Syncthing dissector.

Signed-off-by: Toni Uhlig <matzeton@googlemail.com>

5 files changed, 85 insertions, 0 deletions

diff --git a/src/include/ndpi_protocol_ids.h b/src/include/ndpi_protocol_ids.h
index 9e479622e..68d110041 100644
--- a/src/include/ndpi_protocol_ids.h
+++ b/src/include/ndpi_protocol_ids.h
@@ -341,6 +341,7 @@ typedef enum {
   NDPI_PROTOCOL_FASTCGI               = 310,
   NDPI_PROTOCOL_FTPS                  = 311,
   NDPI_PROTOCOL_NATPMP                = 312,
+  NDPI_PROTOCOL_SYNCTHING             = 313,
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_protocol_ids.h"
diff --git a/src/include/ndpi_protocols.h b/src/include/ndpi_protocols.h
index 0133e1976..69aa391db 100644
--- a/src/include/ndpi_protocols.h
+++ b/src/include/ndpi_protocols.h
@@ -241,6 +241,7 @@ void init_tivoconnect_dissector(struct ndpi_detection_module_struct *ndpi_struct
 void init_kismet_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask);
 void init_fastcgi_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask);
 void init_natpmp_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask);
+void init_syncthing_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask);
 
 /* ndpi_main.c */
 extern u_int32_t ndpi_ip_port_hash_funct(u_int32_t ip, u_int16_t port);
diff --git a/src/lib/ndpi_content_match.c.inc b/src/lib/ndpi_content_match.c.inc
index b8392fd82..373172b1f 100644
--- a/src/lib/ndpi_content_match.c.inc
+++ b/src/lib/ndpi_content_match.c.inc
@@ -1704,6 +1704,8 @@ static ndpi_protocol_match host_match[] =
 
    { "cachefly.com",           "CacheFly", NDPI_PROTOCOL_CACHEFLY, NDPI_PROTOCOL_CATEGORY_CLOUD, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_DEFAULT_LEVEL },
 
+   { "discovery.syncthing.net", "Syncthing", NDPI_PROTOCOL_SYNCTHING, NDPI_PROTOCOL_CATEGORY_DOWNLOAD_FT, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_DEFAULT_LEVEL },
+
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_content_match_host_match.c.inc"
 #endif
diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 42b98fe45..0f56676d0 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -1982,6 +1982,10 @@ static void ndpi_init_protocol_defaults(struct ndpi_detection_module_struct *ndp
                           "NAT-PMP", NDPI_PROTOCOL_CATEGORY_NETWORK,
                           ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
                           ndpi_build_default_ports(ports_b, 5351, 0, 0, 0, 0) /* UDP */);
+  ndpi_set_proto_defaults(ndpi_str, 0 /* encrypted */, 0 /* nw proto */, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_SYNCTHING,
+                          "Syncthing", NDPI_PROTOCOL_CATEGORY_DOWNLOAD_FT,
+                          ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
+                          ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main.c"
@@ -4584,6 +4588,9 @@ static int ndpi_callback_init(struct ndpi_detection_module_struct *ndpi_str) {
   /* NATPMP */
   init_natpmp_dissector(ndpi_str, &a, detection_bitmask);
 
+  /* Syncthing */
+  init_syncthing_dissector(ndpi_str, &a, detection_bitmask);
+
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main_init.c"
 #endif
diff --git a/src/lib/protocols/syncthing.c b/src/lib/protocols/syncthing.c
new file mode 100644
index 000000000..904cad44a
--- /dev/null
+++ b/src/lib/protocols/syncthing.c
@@ -0,0 +1,74 @@
+/*
+ * syncthing.c
+ *
+ * Copyright (C) 2022 - 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_protocol_ids.h"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_SYNCTHING
+
+#include "ndpi_api.h"
+
+static void ndpi_int_syncthing_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                              struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found syncthing\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_SYNCTHING,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+void ndpi_search_syncthing(struct ndpi_detection_module_struct *ndpi_struct,
+                           struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "search syncthing\n");
+
+  if (packet->payload_packet_len <= 4)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (ntohl(get_u_int32_t(packet->payload, 0)) == 0x2EA7D90B /* Magic */)
+  {
+    ndpi_int_syncthing_add_connection(ndpi_struct, flow);
+    /* ToDo: Dissect Announce Message. Protocol buffer dissector required. */
+    return;
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+  return;
+}
+
+void init_syncthing_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                              u_int32_t *id, NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("Syncthing", ndpi_struct, detection_bitmask, *id,
+    NDPI_PROTOCOL_SYNCTHING,
+    ndpi_search_syncthing,
+    NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+    SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+    ADD_TO_DETECTION_BITMASK
+  );
+
+  *id += 1;
+}