Added support for AmongUs. (#1054)

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

2 files changed, 67 insertions, 3 deletions

diff --git a/src/lib/ndpi_main.c b/src/lib/ndpi_main.c
index 349bd36e1..c21c2507d 100644
--- a/src/lib/ndpi_main.c
+++ b/src/lib/ndpi_main.c
@@ -1507,9 +1507,13 @@ static void ndpi_init_protocol_defaults(struct ndpi_detection_module_struct *ndp
 			  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, NDPI_PROTOCOL_ACCEPTABLE, NDPI_PROTOCOL_MONGODB, 1 /* no subprotocol */,
-        no_master, no_master, "MongoDB", NDPI_PROTOCOL_CATEGORY_DATABASE,
-        ndpi_build_default_ports(ports_a, 27017, 0, 0, 0, 0) /* TCP */,
-        ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
+			  no_master, no_master, "MongoDB", NDPI_PROTOCOL_CATEGORY_DATABASE,
+			  ndpi_build_default_ports(ports_a, 27017, 0, 0, 0, 0) /* TCP */,
+			  ndpi_build_default_ports(ports_b, 0, 0, 0, 0, 0) /* UDP */);
+  ndpi_set_proto_defaults(ndpi_str, NDPI_PROTOCOL_FUN, NDPI_PROTOCOL_AMONG_US, 1 /* no subprotocol */,
+			  no_master, no_master, "AmongUs", NDPI_PROTOCOL_CATEGORY_GAME,
+			  ndpi_build_default_ports(ports_a, 0, 0, 0, 0, 0) /* TCP */,
+			  ndpi_build_default_ports(ports_b, 22023, 0, 0, 0, 0) /* UDP */);
 
 #ifdef CUSTOM_NDPI_PROTOCOLS
 #include "../../../nDPI-custom/custom_ndpi_main.c"
@@ -3357,6 +3361,8 @@ void ndpi_set_protocol_detection_bitmask2(struct ndpi_detection_module_struct *n
   /* MongoDB */
   init_mongodb_dissector(ndpi_str, &a, detection_bitmask);
 
+  init_among_us_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/among_us.c b/src/lib/protocols/among_us.c
new file mode 100644
index 000000000..d63fbe849
--- /dev/null
+++ b/src/lib/protocols/among_us.c
@@ -0,0 +1,58 @@
+/*
+ * among_us.c
+ *
+ * Copyright (C) 2020 - 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_AMONG_US
+
+#include "ndpi_api.h"
+
+static void ndpi_int_among_us_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                             struct ndpi_flow_struct *flow)
+{
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_AMONG_US, NDPI_PROTOCOL_UNKNOWN);
+}
+
+void ndpi_search_among_us(struct ndpi_detection_module_struct *ndpi_struct,
+                          struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct * const packet = &flow->packet;
+
+  /* handshake packet */
+  if (packet->payload_packet_len > 9 &&
+      ntohl(*(u_int32_t*)&packet->payload[0]) == 0x08000100 &&
+      ntohl(*(u_int32_t*)&packet->payload[4]) == 0x80d90203)
+  {
+    ndpi_int_among_us_add_connection(ndpi_struct, flow);
+  } else {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+  }
+}
+
+void init_among_us_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
+                             NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection(
+    "AmongUs", ndpi_struct, detection_bitmask, *id,
+    NDPI_PROTOCOL_AMONG_US, ndpi_search_among_us, NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+    SAVE_DETECTION_BITMASK_AS_UNKNOWN, ADD_TO_DETECTION_BITMASK);
+  *id += 1;
+}
+