Adding upstream version 4.2.2.upstream/4.2.2

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 274 insertions, 0 deletions

diff --git a/epan/dissectors/packet-db-lsp.c b/epan/dissectors/packet-db-lsp.c
new file mode 100644
index 00000000..5b35930c
--- /dev/null
+++ b/epan/dissectors/packet-db-lsp.c
@@ -0,0 +1,274 @@
+/* packet-db-lsp.c
+ * Routines for Dropbox LAN sync Protocol
+ *
+ * Copyright 2010, Stig Bjorlykke <stig@bjorlykke.org>
+ *
+ * Wireshark - Network traffic analyzer
+ * By Gerald Combs <gerald@wireshark.org>
+ * Copyright 1998 Gerald Combs
+ *
+ * SPDX-License-Identifier: GPL-2.0-or-later
+ */
+
+#include "config.h"
+
+#include <epan/packet.h>
+#include <epan/asn1.h>
+#include <epan/prefs.h>
+
+#include "packet-tcp.h"
+#include "packet-x509af.h"
+
+#define PNAME  "Dropbox LAN sync Protocol"
+#define PSNAME "DB-LSP"
+#define PFNAME "db-lsp"
+
+#define PNAME_DISC  "Dropbox LAN sync Discovery Protocol"
+#define PSNAME_DISC "DB-LSP-DISC"
+#define PFNAME_DISC "db-lsp-disc"
+
+#define DB_LSP_PORT  17500
+
+void proto_register_db_lsp(void);
+void proto_reg_handoff_db_lsp(void);
+
+static int proto_db_lsp = -1;
+static int proto_db_lsp_disc = -1;
+
+static int hf_type = -1;
+static int hf_magic = -1;
+static int hf_length = -1;
+static int hf_opvalue = -1;
+static int hf_data = -1;
+static int hf_value = -1;
+static int hf_text = -1;
+
+static gint ett_db_lsp = -1;
+
+static heur_dissector_list_t heur_subdissector_list;
+
+static dissector_handle_t db_lsp_tcp_handle;
+static dissector_handle_t db_lsp_udp_handle;
+
+/* Use heuristic */
+static gboolean try_heuristic = TRUE;
+/* desegmentation of tcp payload */
+static gboolean db_lsp_desegment = TRUE;
+
+#define TYPE_CONFIG   0x16
+#define TYPE_DATA     0x17
+
+static const value_string type_vals[] = {
+  { TYPE_CONFIG,    "Configuration" },
+  { TYPE_DATA,      "Data" },
+  { 0, NULL }
+};
+
+#define OP_CERT       0x0B
+
+static const value_string op_vals[] = {
+  { OP_CERT,   "Certificate" },
+  { 0, NULL }
+};
+
+static int
+dissect_db_lsp_pdu (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+  proto_tree *db_lsp_tree;
+  proto_item *db_lsp_item;
+  gint        offset = 0;
+  guint8      type, opvalue;
+  guint16     magic, length;
+
+  col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME);
+  col_set_str (pinfo->cinfo, COL_INFO, PNAME);
+
+  db_lsp_item = proto_tree_add_item (tree, proto_db_lsp, tvb, offset, -1, ENC_NA);
+  db_lsp_tree = proto_item_add_subtree (db_lsp_item, ett_db_lsp);
+
+  type = tvb_get_guint8 (tvb, offset);
+  proto_tree_add_item (db_lsp_tree, hf_type, tvb, offset, 1, ENC_BIG_ENDIAN);
+  offset += 1;
+
+  if (type == 0x80) {
+    /* Two unknown bytes */
+    offset += 2;
+  }
+
+  magic = tvb_get_ntohs (tvb, offset);
+  proto_tree_add_item (db_lsp_tree, hf_magic, tvb, offset, 2, ENC_BIG_ENDIAN);
+  offset += 2;
+
+  length = tvb_get_ntohs (tvb, offset);
+  proto_tree_add_item (db_lsp_tree, hf_length, tvb, offset, 2, ENC_BIG_ENDIAN);
+  offset += 2;
+
+  if (magic != 0x0301 || length > tvb_reported_length_remaining (tvb, offset)) {
+    /* Probably an unknown packet */
+    /* expert_add_info_format (pinfo, db_lsp_item, PI_UNDECODED, PI_WARN, "Unknown packet"); */
+    return 0;
+  }
+
+  if (type == TYPE_CONFIG) {
+    opvalue = tvb_get_guint8 (tvb, offset);
+    proto_tree_add_item (db_lsp_tree, hf_opvalue, tvb, offset, 1, ENC_BIG_ENDIAN);
+
+    if (opvalue == OP_CERT) {
+      /* X509 Certificate */
+      tvbuff_t *cert_tvb = tvb_new_subset_length (tvb, offset+10, length-10);
+      dissect_x509af_Certificate_PDU (cert_tvb, pinfo, db_lsp_tree, NULL);
+    } else {
+      proto_tree_add_item (db_lsp_tree, hf_value, tvb, offset, length, ENC_NA);
+    }
+  } else if (type == TYPE_DATA) {
+    proto_tree_add_item (db_lsp_tree, hf_data, tvb, offset, length, ENC_NA);
+  } else {
+    proto_tree_add_item (db_lsp_tree, hf_value, tvb, offset, length, ENC_NA);
+  }
+  /*offset += length;*/
+
+  proto_item_append_text (db_lsp_item, ", Type: %d, Length: %d", type, length);
+  proto_item_set_len (db_lsp_item, length + 5);
+  return tvb_reported_length(tvb);
+}
+
+static guint
+get_db_lsp_pdu_len (packet_info *pinfo _U_, tvbuff_t *tvb,
+                    int offset, void *data _U_)
+{
+  if (tvb_get_ntohs (tvb, offset + 1) != 0x0301) {
+    /* Unknown data, eat remaining data for this frame */
+    return tvb_reported_length_remaining (tvb, offset);
+  }
+
+  return tvb_get_ntohs (tvb, offset + 3) + 5;
+}
+
+static int
+dissect_db_lsp_tcp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data)
+{
+  tcp_dissect_pdus (tvb, pinfo, tree, db_lsp_desegment, 5,
+                    get_db_lsp_pdu_len, dissect_db_lsp_pdu, data);
+  return tvb_reported_length(tvb);
+}
+
+static int
+dissect_db_lsp_disc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
+{
+  proto_tree *db_lsp_tree;
+  proto_item *db_lsp_item;
+  gint        offset = 0;
+  heur_dtbl_entry_t *hdtbl_entry;
+  proto_tree *data_subtree;
+
+  col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME_DISC);
+  col_set_str (pinfo->cinfo, COL_INFO, PNAME_DISC);
+
+  db_lsp_item = proto_tree_add_item (tree, proto_db_lsp_disc, tvb, offset, -1, ENC_NA);
+  db_lsp_tree = proto_item_add_subtree (db_lsp_item, ett_db_lsp);
+
+  /* try the heuristic dissectors */
+  if (try_heuristic) {
+    data_subtree = proto_item_add_subtree(db_lsp_item, ett_db_lsp);
+    if (dissector_try_heuristic(heur_subdissector_list, tvb, pinfo, data_subtree, &hdtbl_entry, NULL)) {
+      return tvb_captured_length(tvb);
+    }
+  }
+
+  /* heuristic failed. Print remaining bytes as text */
+  proto_tree_add_item (db_lsp_tree, hf_text, tvb, offset, -1, ENC_ASCII);
+  return tvb_captured_length(tvb);
+}
+
+void
+proto_register_db_lsp (void)
+{
+  static hf_register_info hf[] = {
+    { &hf_type,
+      { "Type", "db-lsp.type",
+        FT_UINT8, BASE_DEC_HEX, VALS(type_vals), 0x0,
+        NULL, HFILL } },
+
+    { &hf_magic,
+      { "Magic", "db-lsp.magic",
+        FT_UINT16, BASE_DEC_HEX, NULL, 0x0,
+        "Magic number", HFILL } },
+
+    { &hf_length,
+      { "Length", "db-lsp.length",
+        FT_UINT16, BASE_DEC_HEX, NULL, 0x0,
+        "Length in bytes", HFILL } },
+
+    { &hf_opvalue,
+      { "OP Value", "db-lsp.op",
+        FT_UINT8, BASE_DEC_HEX, VALS(op_vals), 0x0,
+        NULL, HFILL } },
+
+    { &hf_value,
+      { "Value", "db-lsp.value",
+        FT_BYTES, BASE_NONE, NULL, 0x0,
+        NULL, HFILL } },
+
+    { &hf_data,
+      { "Data", "db-lsp.data",
+        FT_BYTES, BASE_NONE, NULL, 0x0,
+        NULL, HFILL } },
+
+    { &hf_text,
+      { "Text", "db-lsp.text",
+        FT_STRING, BASE_NONE, NULL, 0x0,
+        NULL, HFILL } },
+  };
+
+  static gint *ett[] = {
+    &ett_db_lsp,
+  };
+
+  module_t *db_lsp_module;
+
+  proto_db_lsp = proto_register_protocol (PNAME, PSNAME, PFNAME);
+  proto_db_lsp_disc = proto_register_protocol (PNAME_DISC, PSNAME_DISC, PFNAME_DISC);
+  db_lsp_tcp_handle = register_dissector ("db-lsp.tcp", dissect_db_lsp_tcp, proto_db_lsp);
+  db_lsp_udp_handle = register_dissector ("db-lsp.udp", dissect_db_lsp_disc, proto_db_lsp_disc);
+
+  heur_subdissector_list = register_heur_dissector_list("db-lsp", proto_db_lsp);
+
+  proto_register_field_array (proto_db_lsp, hf, array_length (hf));
+  proto_register_subtree_array (ett, array_length (ett));
+
+  /* Register our configuration options */
+  db_lsp_module = prefs_register_protocol (proto_db_lsp, NULL);
+
+  prefs_register_bool_preference (db_lsp_module, "desegment_pdus",
+                                  "Reassemble PDUs spanning multiple TCP segments",
+                                  "Whether the LAN sync dissector should reassemble PDUs"
+                                  " spanning multiple TCP segments."
+                                  " To use this option, you must also enable \"Allow subdissectors"
+                                  " to reassemble TCP streams\" in the TCP protocol settings.",
+                                  &db_lsp_desegment);
+
+  prefs_register_bool_preference(db_lsp_module, "try_heuristic",
+                                  "Try heuristic sub-dissectors",
+                                  "Try to decode the payload using an heuristic sub-dissector",
+                                  &try_heuristic);
+}
+
+void
+proto_reg_handoff_db_lsp (void)
+{
+  dissector_add_uint_with_preference("tcp.port", DB_LSP_PORT, db_lsp_tcp_handle);
+  dissector_add_uint_with_preference("udp.port", DB_LSP_PORT, db_lsp_udp_handle);
+}
+
+/*
+ * Editor modelines
+ *
+ * Local Variables:
+ * c-basic-offset: 2
+ * tab-width: 8
+ * indent-tabs-mode: nil
+ * End:
+ *
+ * ex: set shiftwidth=2 tabstop=8 expandtab:
+ * :indentSize=2:tabSize=8:noTabs=true:
+ */