Add LagoFast protocol dissector. (#2743)

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

3 files changed, 88 insertions, 0 deletions

diff --git a/src/lib/ndpi_content_match.c.inc b/src/lib/ndpi_content_match.c.inc
index 245af396a..9cdd12385 100644
--- a/src/lib/ndpi_content_match.c.inc
+++ b/src/lib/ndpi_content_match.c.inc
@@ -1650,6 +1650,10 @@ static ndpi_protocol_match host_match[] =
 
    { "rutube.ru",			 "RUTUBE", NDPI_PROTOCOL_RUTUBE, NDPI_PROTOCOL_CATEGORY_MEDIA, NDPI_PROTOCOL_FUN, NDPI_PROTOCOL_DEFAULT_LEVEL },
 
+   /* LagoFast */
+   { "6fast.com",                        "LagoFast", NDPI_PROTOCOL_LAGOFAST, NDPI_PROTOCOL_CATEGORY_VPN, NDPI_PROTOCOL_FUN, NDPI_PROTOCOL_DEFAULT_LEVEL },
+   { "lagofast.com",                     "LagoFast", NDPI_PROTOCOL_LAGOFAST, NDPI_PROTOCOL_CATEGORY_VPN, NDPI_PROTOCOL_FUN, 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 11d9d44d1..fe8004178 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -2465,6 +2465,10 @@ static void ndpi_init_protocol_defaults(struct ndpi_detection_module_struct *ndp
                           "MS_OneDrive", NDPI_PROTOCOL_CATEGORY_COLLABORATIVE, NDPI_PROTOCOL_QOE_CATEGORY_UNSPECIFIED,
                           ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
                           ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
+  ndpi_set_proto_defaults(ndpi_str, 0 /* encrypted */, 0 /* nw proto */, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_LAGOFAST,
+                          "LagoFast", NDPI_PROTOCOL_CATEGORY_VPN, NDPI_PROTOCOL_QOE_CATEGORY_ONLINE_GAMING,
+                          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"
@@ -6431,6 +6435,9 @@ static int ndpi_callback_init(struct ndpi_detection_module_struct *ndpi_str) {
   /* Paltalk */
   init_paltalk_dissector(ndpi_str, &a);
 
+  /* LagoFast */
+  init_lagofast_dissector(ndpi_str, &a);
+
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main_init.c"
 #endif
diff --git a/src/lib/protocols/lagofast.c b/src/lib/protocols/lagofast.c
new file mode 100644
index 000000000..624c528a0
--- /dev/null
+++ b/src/lib/protocols/lagofast.c
@@ -0,0 +1,77 @@
+/*
+ * lagofast.c
+ *
+ * Copyright (C) 2011-25 - 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_LAGOFAST
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static void ndpi_int_lagofast_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                             struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found LagoFast\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_LAGOFAST,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_lagofast(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 LagoFast\n");
+  if (packet->payload_packet_len < 6) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  // LagoFast identifier
+  if (get_u_int32_t(packet->payload, 0) != htonl(0x006e5d03)) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  // Check encoded length
+  const uint16_t encoded_length = ntohs(get_u_int16_t(packet->payload, 4));
+  if (packet->payload_packet_len != encoded_length + 6 /* identifier + length */) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  ndpi_int_lagofast_add_connection(ndpi_struct, flow);
+}
+
+void init_lagofast_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                             u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("LagoFast", ndpi_struct, *id,
+				      NDPI_PROTOCOL_LAGOFAST,
+				      ndpi_search_lagofast,
+				      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+				      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+				      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}
+