Add AVAST dissector. (#1674)

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

1 files changed, 67 insertions, 0 deletions

diff --git a/src/lib/protocols/avast.c b/src/lib/protocols/avast.c
new file mode 100644
index 000000000..b94c5ad62
--- /dev/null
+++ b/src/lib/protocols/avast.c
@@ -0,0 +1,67 @@
+/*
+ * avast.c
+ *
+ * Copyright (C) 2012-22 - ntop.org
+ *
+ * This module 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.
+ *
+ * This module 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.
+ * If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "ndpi_protocol_ids.h"
+
+#define NDPI_CURRENT_PROTO NDPI_PROTOCOL_AVAST
+
+#include <stdlib.h>
+#include "ndpi_api.h"
+
+static void ndpi_int_avast_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                          struct ndpi_flow_struct *flow)
+{
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_AVAST, NDPI_PROTOCOL_UNKNOWN, NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_avast(struct ndpi_detection_module_struct *ndpi_struct,
+                              struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct * packet = &ndpi_struct->packet;
+
+  if (packet->payload_packet_len < 6)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (strncmp((char *)&packet->payload[0], "NOSA", NDPI_STATICSTRING_LEN("NOSA")) == 0 &&
+      ntohs(*(uint16_t *)&packet->payload[4]) == packet->payload_packet_len)
+  {
+    ndpi_int_avast_add_connection(ndpi_struct, flow);
+    return;
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_avast_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
+                          NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("AVAST",
+                                      ndpi_struct, detection_bitmask, *id,
+                                      NDPI_PROTOCOL_AVAST,
+                                      ndpi_search_avast,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}