Add support for Epic Games and GeForceNow/Nvidia (#1990)

1 files changed, 87 insertions, 0 deletions

diff --git a/src/lib/protocols/epicgames.c b/src/lib/protocols/epicgames.c
new file mode 100644
index 000000000..ea30783fd
--- /dev/null
+++ b/src/lib/protocols/epicgames.c
@@ -0,0 +1,87 @@
+/*
+ * epicgames.c
+ *
+ * Copyright (C) 2023 - 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_EPICGAMES
+
+#include "ndpi_api.h"
+
+static void ndpi_int_epicgames_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                              struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found EpicGames\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_PROTOCOL_EPICGAMES,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_epicgames(struct ndpi_detection_module_struct *ndpi_struct,
+                                  struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct *packet = &ndpi_struct->packet;
+
+  NDPI_LOG_DBG(ndpi_struct, "searching EpicGames (stage %d dir %d)\n",
+               flow->l4.udp.epicgames_stage, packet->packet_direction);
+
+  if(flow->packet_counter == 1) {
+    if(packet->payload_packet_len >= 34 &&
+       ((ntohl(get_u_int32_t(packet->payload, 0)) & 0x08) == 0) &&
+       get_u_int64_t(packet->payload, 10) == 0 &&
+       get_u_int64_t(packet->payload, 18) == 0 &&
+       get_u_int64_t(packet->payload, 26) == 0) {
+      flow->l4.udp.epicgames_stage = 1 + packet->packet_direction;
+      flow->l4.udp.epicgames_word = ntohl(get_u_int32_t(packet->payload, 0));
+      return;
+    } else {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+      return;
+    }
+  } else if(flow->l4.udp.epicgames_stage == 2 - packet->packet_direction) {
+    if(packet->payload_packet_len > 4 &&
+       (flow->l4.udp.epicgames_word | 0x08) == ntohl(get_u_int32_t(packet->payload, 0))) {
+      ndpi_int_epicgames_add_connection(ndpi_struct, flow);
+      return;
+    } else {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+      return;
+    }
+  }
+
+  if(flow->packet_counter >= 4) {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+}
+
+void init_epicgames_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                              u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("EpicGames", ndpi_struct, *id,
+                                      NDPI_PROTOCOL_EPICGAMES,
+                                      ndpi_search_epicgames,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}