Added AVAST SecureDNS protocol. (#1244)

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

1 files changed, 68 insertions, 0 deletions

diff --git a/src/lib/protocols/avast_securedns.c b/src/lib/protocols/avast_securedns.c
new file mode 100644
index 000000000..06fbaa17c
--- /dev/null
+++ b/src/lib/protocols/avast_securedns.c
@@ -0,0 +1,68 @@
+/*
+ * avast.c
+ *
+ * Copyright (C) 2012-21 - 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_SECUREDNS
+
+#include <stdlib.h>
+#include "ndpi_api.h"
+
+static void ndpi_int_avast_securedns_add_connection(struct ndpi_detection_module_struct *ndpi_struct,
+                                                    struct ndpi_flow_struct *flow)
+{
+  ndpi_set_detected_protocol(ndpi_struct, flow, NDPI_PROTOCOL_AVAST_SECUREDNS, NDPI_PROTOCOL_UNKNOWN);
+}
+
+static void ndpi_search_avast_securedns(struct ndpi_detection_module_struct *ndpi_struct,
+                                        struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct * packet = &flow->packet;
+
+  if (packet->payload_packet_len < 34 ||
+      ntohl(get_u_int32_t(packet->payload, 11)) != 0x00013209 ||
+      flow->packet_counter > 1)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (strncasecmp((char *)&packet->payload[15], "securedns", strlen("securedns")) == 0)
+  {
+    ndpi_int_avast_securedns_add_connection(ndpi_struct, flow);
+    return;
+  }
+
+  NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+}
+
+void init_avast_securedns_dissector(struct ndpi_detection_module_struct *ndpi_struct, u_int32_t *id,
+                                    NDPI_PROTOCOL_BITMASK *detection_bitmask)
+{
+  ndpi_set_bitmask_protocol_detection("AVAST SecureDNS",
+                                      ndpi_struct, detection_bitmask, *id,
+                                      NDPI_PROTOCOL_AVAST_SECUREDNS,
+                                      ndpi_search_avast_securedns,
+                                      NDPI_SELECTION_BITMASK_PROTOCOL_UDP_WITH_PAYLOAD,
+                                      SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+                                      ADD_TO_DETECTION_BITMASK);
+
+  *id += 1;
+}