forked from osmocom/wireshark
232 lines
6.7 KiB
C
232 lines
6.7 KiB
C
![]() |
/* packet-db-lsp.c
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* Routines for Dropbox LAN sync Protocol
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*
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* Copyright 2010, Stig Bjorlykke <stig@bjorlykke.org>
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*
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* $Id$
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <glib.h>
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#include <epan/packet.h>
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#include <epan/asn1.h>
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#include <epan/prefs.h>
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#include <epan/expert.h>
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#include "packet-tcp.h"
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#include "packet-x509af.h"
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#define PNAME "Dropbox LAN sync Protocol"
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#define PSNAME "DB-LSP"
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#define PFNAME "db-lsp"
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#define PNAME_DISC "Dropbox LAN sync Discovery Protocol"
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#define PSNAME_DISC "DB-LSP-DISC"
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#define PFNAME_DISC "db-lsp-disc"
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#define DB_LSP_PORT 17500
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static int proto_db_lsp = -1;
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static int proto_db_lsp_disc = -1;
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static int hf_type = -1;
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static int hf_magic = -1;
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static int hf_length = -1;
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static int hf_value = -1;
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static int hf_text = -1;
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static gint ett_db_lsp = -1;
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/* desegmentation of tcp payload */
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static gboolean db_lsp_desegment = TRUE;
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static void
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dissect_db_lsp_pdu (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *db_lsp_tree;
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proto_item *db_lsp_item;
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gint offset = 0;
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guint8 type, opvalue;
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guint16 magic, length;
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col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME);
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col_set_str (pinfo->cinfo, COL_INFO, PNAME);
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db_lsp_item = proto_tree_add_item (tree, proto_db_lsp, tvb, offset, -1, FALSE);
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db_lsp_tree = proto_item_add_subtree (db_lsp_item, ett_db_lsp);
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type = tvb_get_guint8 (tvb, offset);
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proto_tree_add_item (db_lsp_tree, hf_type, tvb, offset, 1, FALSE);
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offset += 1;
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if (type == 0x80) {
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/* Two unknown bytes */
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offset += 2;
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}
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magic = tvb_get_ntohs (tvb, offset);
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proto_tree_add_item (db_lsp_tree, hf_magic, tvb, offset, 2, FALSE);
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offset += 2;
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length = tvb_get_ntohs (tvb, offset);
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proto_tree_add_item (db_lsp_tree, hf_length, tvb, offset, 2, FALSE);
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offset += 2;
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if (magic != 0x0301 || length > tvb_length_remaining (tvb, offset)) {
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/* Probably an unknown packet */
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/* expert_add_info_format (pinfo, db_lsp_item, PI_UNDECODED, PI_WARN, "Unknown packet"); */
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return;
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}
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opvalue = tvb_get_guint8 (tvb, offset);
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proto_tree_add_item (db_lsp_tree, hf_value, tvb, offset, length, FALSE);
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if (type == 0x16 && opvalue == 0x0B) {
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/* X509 Certificate */
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tvbuff_t *cert_tvb = tvb_new_subset (tvb, offset+10, length-10, length-10);
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dissect_x509af_Certificate_PDU (cert_tvb, pinfo, db_lsp_tree);
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}
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offset += length;
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proto_item_append_text (db_lsp_item, ", Type: %d, Length: %d", type, length);
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proto_item_set_len (db_lsp_item, length + 5);
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}
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static guint
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get_db_lsp_pdu_len (packet_info *pinfo _U_, tvbuff_t *tvb, int offset)
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{
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if (tvb_get_ntohs (tvb, offset + 1) != 0x0301) {
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/* Unknown data, eat remaining data for this frame */
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return tvb_length_remaining (tvb, offset);
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}
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return tvb_get_ntohs (tvb, offset + 3) + 5;
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}
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static void
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dissect_db_lsp_tcp (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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tcp_dissect_pdus (tvb, pinfo, tree, db_lsp_desegment, 5,
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get_db_lsp_pdu_len, dissect_db_lsp_pdu);
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}
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static void
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dissect_db_lsp_disc (tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *db_lsp_tree;
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proto_item *db_lsp_item;
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gint offset = 0;
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col_set_str (pinfo->cinfo, COL_PROTOCOL, PSNAME_DISC);
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col_set_str (pinfo->cinfo, COL_INFO, PNAME_DISC);
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db_lsp_item = proto_tree_add_item (tree, proto_db_lsp_disc, tvb, offset, -1, FALSE);
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db_lsp_tree = proto_item_add_subtree (db_lsp_item, ett_db_lsp);
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proto_tree_add_item (db_lsp_tree, hf_text, tvb, offset, -1, FALSE);
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}
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void
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proto_register_db_lsp (void)
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{
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static hf_register_info hf[] = {
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{ &hf_type,
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{ "Type", "db-lsp.type",
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FT_UINT8, BASE_DEC_HEX, NULL, 0x0,
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"Type", HFILL } },
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{ &hf_magic,
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{ "Magic", "db-lsp.magic",
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FT_UINT16, BASE_DEC_HEX, NULL, 0x0,
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"Magic number", HFILL } },
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{ &hf_length,
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{ "Length", "db-lsp.length",
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FT_UINT16, BASE_DEC_HEX, NULL, 0x0,
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"Length in bytes", HFILL } },
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{ &hf_value,
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{ "Value", "db-lsp.value",
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FT_BYTES, BASE_NONE, NULL, 0x0,
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NULL, HFILL } },
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{ &hf_text,
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{ "Text", "db-lsp.text",
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FT_STRING, BASE_NONE, NULL, 0x0,
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NULL, HFILL } },
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};
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static gint *ett[] = {
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&ett_db_lsp,
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};
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module_t *db_lsp_module;
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proto_db_lsp = proto_register_protocol (PNAME, PSNAME, PFNAME);
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proto_db_lsp_disc = proto_register_protocol (PNAME_DISC, PSNAME_DISC, PFNAME_DISC);
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register_dissector ("db-lsp.tcp", dissect_db_lsp_tcp, proto_db_lsp);
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register_dissector ("db-lsp.udp", dissect_db_lsp_disc, proto_db_lsp_disc);
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proto_register_field_array (proto_db_lsp, hf, array_length (hf));
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proto_register_subtree_array (ett, array_length (ett));
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/* Register our configuration options */
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db_lsp_module = prefs_register_protocol (proto_db_lsp, NULL);
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prefs_register_bool_preference (db_lsp_module, "desegment_pdus",
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"Reassemble PDUs spanning multiple TCP segments",
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"Whether the LAN sync dissector should reassemble PDUs"
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" spanning multiple TCP segments."
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" To use this option, you must also enable \"Allow subdissectors"
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" to reassemble TCP streams\" in the TCP protocol settings.",
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&db_lsp_desegment);
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}
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void
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proto_reg_handoff_db_lsp (void)
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{
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dissector_handle_t db_lsp_tcp_handle;
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dissector_handle_t db_lsp_udp_handle;
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db_lsp_tcp_handle = find_dissector ("db-lsp.tcp");
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db_lsp_udp_handle = find_dissector ("db-lsp.udp");
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dissector_add ("tcp.port", DB_LSP_PORT, db_lsp_tcp_handle);
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dissector_add ("udp.port", DB_LSP_PORT, db_lsp_udp_handle);
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}
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/*
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* Editor modelines
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 2
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=2 expandtab
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* :indentSize=2:tabSize=2:noTabs=true:
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*/
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