1 files changed, 139 insertions, 0 deletions
diff --git a/src/lib/protocols/roughtime.c b/src/lib/protocols/roughtime.c
new file mode 100644
index 000000000..5ebd00b84
--- /dev/null
+++ b/src/lib/protocols/roughtime.c
@@ -0,0 +1,139 @@
+/*
+ * roughtime.c
+ *
+ * Copyright (C) 2024 - 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_ROUGHTIME
+
+#include "ndpi_api.h"
+#include "ndpi_private.h"
+
+static u_int32_t const valid_tags[] = {
+  0x00444150 /* PAD */,
+  0x00474953 /* SIG */,
+  0x00524556 /* VER */,
+  0x31545544 /* DUT1 */,
+  0x434e4f4e /* NONC */,
+  0x454c4544 /* DELE */,
+  0x48544150 /* PATH */,
+  0x49415444 /* DTAI */,
+  0x49444152 /* RADI */,
+  0x4b425550 /* PUBK */,
+  0x5041454c /* LEAP */,
+  0x5044494d /* MIDP */,
+  0x50455253 /* SREP */,
+  0x544e494d /* MINT */,
+  0x544f4f52 /* ROOT */,
+  0x54524543 /* CERT */,
+  0x5458414d /* MAXT */,
+  0x58444e49 /* INDX */,
+  /*
+   * It seems that some implementations are not following the specs
+   * by using 0xFF instead of 0x00 as ASCII NUL.
+   */
+  0xFF444150 /* PAD */,
+  0xFF474953 /* SIG */,
+  0xFF524556 /* VER */,
+  /*
+   * Newer drafts may have the following additional tag.
+   */
+  0x7a7a7a7a /* ZZZZ */,
+};
+
+static void ndpi_int_roughtime_add_connection(struct ndpi_detection_module_struct * const ndpi_struct,
+                                              struct ndpi_flow_struct * const flow)
+{
+  NDPI_LOG_INFO(ndpi_struct, "found roughtime\n");
+  ndpi_set_detected_protocol(ndpi_struct, flow,
+                             NDPI_PROTOCOL_ROUGHTIME,
+                             NDPI_PROTOCOL_UNKNOWN,
+                             NDPI_CONFIDENCE_DPI);
+}
+
+static void ndpi_search_roughtime(struct ndpi_detection_module_struct *ndpi_struct,
+                                  struct ndpi_flow_struct *flow)
+{
+  struct ndpi_packet_struct const * const packet = &ndpi_struct->packet;
+
+  NDPI_LOG_INFO(ndpi_struct, "search roughtime\n");
+
+  if (packet->payload_packet_len < 4)
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  u_int32_t number_of_tags = le32toh(get_u_int32_t(packet->payload, 0));
+  size_t const minimum_length = 4 /* number of tags (N) */ +
+                               (number_of_tags - 1) * 4 /* number of tag offsets (N-1) */ +
+                               (number_of_tags * 4) /* tags itself (N) */;
+  if (number_of_tags < 1 || packet->payload_packet_len < minimum_length ||
+      number_of_tags > NDPI_ARRAY_LENGTH(valid_tags))
+  {
+    NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+    return;
+  }
+
+  if (number_of_tags > 1) {
+    u_int32_t tag_offset = le32toh(get_u_int32_t(packet->payload, 4 + (number_of_tags - 2) * 4));
+    if (packet->payload_packet_len < 4 + (number_of_tags - 1) * 4 + tag_offset)
+    {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+      return;
+    }
+  }
+
+  size_t i;
+  for (i = 0; i < number_of_tags; ++i)
+  {
+    u_int32_t tag = le32toh(get_u_int32_t(packet->payload, 4 + (number_of_tags - 1) * 4 + i * 4));
+
+    size_t j;
+    for (j = 0; j < NDPI_ARRAY_LENGTH(valid_tags); ++j)
+    {
+      if (tag == valid_tags[j])
+      {
+        break;
+      }
+    }
+    if (j == NDPI_ARRAY_LENGTH(valid_tags))
+    {
+      NDPI_EXCLUDE_PROTO(ndpi_struct, flow);
+      return;
+    }
+  }
+
+  ndpi_int_roughtime_add_connection(ndpi_struct, flow);
+}
+
+void init_roughtime_dissector(struct ndpi_detection_module_struct *ndpi_struct,
+                              u_int32_t *id)
+{
+  ndpi_set_bitmask_protocol_detection("Roughtime", ndpi_struct, *id,
+    NDPI_PROTOCOL_ROUGHTIME,
+    ndpi_search_roughtime,
+    NDPI_SELECTION_BITMASK_PROTOCOL_V4_V6_TCP_OR_UDP_WITH_PAYLOAD_WITHOUT_RETRANSMISSION,
+    SAVE_DETECTION_BITMASK_AS_UNKNOWN,
+    ADD_TO_DETECTION_BITMASK
+  );
+
+  *id += 1;
+}