diff options
Diffstat (limited to 'epan/dissectors/packet-nwmtp.c')
| -rw-r--r-- | epan/dissectors/packet-nwmtp.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/epan/dissectors/packet-nwmtp.c b/epan/dissectors/packet-nwmtp.c new file mode 100644 index 00000000..4ab1ade8 --- /dev/null +++ b/epan/dissectors/packet-nwmtp.c @@ -0,0 +1,169 @@ +/* packet-nwmtp.c + * Routines for NexusWare MTP3 over UDP transport + * Copyright 2010 by Holger Hans Peter Freyther <zecke@selfish.org> + * Copyright 2010 by On-Waves + * + * 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> + +void proto_register_mwmtp(void); +void proto_reg_handoff_nwmtp(void); + +static dissector_handle_t mtp_handle; +static gint proto_nwmtp = -1; + +static int hf_nwmtp_transp_type = -1; +static int hf_nwmtp_user_context = -1; +static int hf_nwmtp_data_type = -1; +static int hf_nwmtp_data_index = -1; +static int hf_nwmtp_data_length = -1; + +/* subtree pointer */ +static gint ett_mwmtp = -1; + +static dissector_handle_t nwmtp_handle; + +static const value_string nwmtp_transport_type_vals[] = { + { 2, "UDP" }, + { 3, "TCP" }, + { 0, NULL }, +}; + +static const value_string nwmtp_data_type_vals[] = { + { 0, "MSU Prio 0" }, + { 1, "MSU Prio 1" }, + { 2, "MSU Prio 2" }, + { 3, "MSU Prio 3" }, + {16, "Retrieved MSU Prio 0" }, + {17, "Retrieved MSU Prio 0" }, + {18, "Retrieved MSU Prio 0" }, + {32, "Retrieval complete" }, + {33, "Retrieval impossible" }, + {34, "Link in service" }, + {35, "Link out of service" }, + { 0, NULL }, +}; + +static int dissect_nwmtp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_) +{ + gint offset = 0; + + col_set_str(pinfo->cinfo, COL_PROTOCOL, "NW MTP"); + col_clear(pinfo->cinfo, COL_INFO); + + while (tvb_reported_length_remaining(tvb, offset) > 0) { + const gchar *type; + proto_item *ti; + proto_item *nwmtp_tree; + guint32 len; + tvbuff_t *next_tvb; + + /* update the info column */ + type = val_to_str_const(tvb_get_guint8(tvb, offset + 1), + nwmtp_data_type_vals, "Unknown"); + col_set_str(pinfo->cinfo, COL_INFO, type); + + len = tvb_get_ntohl(tvb, offset + 8); + + if (tree) { + ti = proto_tree_add_protocol_format(tree, proto_nwmtp, + tvb, offset, len + 12, + "NexusWare C7 UDP Protocol"); + + nwmtp_tree = proto_item_add_subtree(ti, ett_mwmtp); + proto_tree_add_item(nwmtp_tree, hf_nwmtp_transp_type, + tvb, offset, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(nwmtp_tree, hf_nwmtp_data_type, + tvb, offset + 1, 1, ENC_BIG_ENDIAN); + proto_tree_add_item(nwmtp_tree, hf_nwmtp_data_index, + tvb, offset + 2, 2, ENC_BIG_ENDIAN); + proto_tree_add_item(nwmtp_tree, hf_nwmtp_user_context, + tvb, offset + 4, 4, ENC_BIG_ENDIAN); + proto_tree_add_item(nwmtp_tree, hf_nwmtp_data_length, + tvb, offset + 8, 4, ENC_BIG_ENDIAN); + } + + next_tvb = tvb_new_subset_length(tvb, offset + 12, len); + if (tvb_reported_length(next_tvb) > 0) + call_dissector(mtp_handle, next_tvb, pinfo, tree); + /* Check for overflows, which probably can't happen, but better + * safe than sorry. See + * https://gitlab.com/wireshark/wireshark/-/issues/8169 + */ + DISSECTOR_ASSERT(len < G_MAXUINT32 - 11); + DISSECTOR_ASSERT((guint64)offset + len + 12 < G_MAXINT); + offset += len + 12; + } + + return tvb_captured_length(tvb); +} + +void proto_register_mwmtp(void) +{ + static hf_register_info hf[] = { + {&hf_nwmtp_transp_type, + {"Transport Type", "nwmtp.transp_type", + FT_UINT8, BASE_DEC, VALS(nwmtp_transport_type_vals), 0x0, + "The Transport Type", HFILL} + }, + {&hf_nwmtp_data_type, + {"Data Type", "nwmtp.data_type", + FT_UINT8, BASE_DEC, VALS(nwmtp_data_type_vals), 0x0, + "The Data Type", HFILL} + }, + {&hf_nwmtp_data_index, + {"Link Index", "nwmtp.link_index", + FT_UINT16, BASE_DEC, NULL, 0x0, + NULL, HFILL} + }, + {&hf_nwmtp_user_context, + {"User Context", "nwmtp.user_context", + FT_UINT32, BASE_DEC, NULL, 0x0, + "Use Context", HFILL} + }, + {&hf_nwmtp_data_length, + {"Length", "nwmtp.data_length", + FT_UINT32, BASE_DEC, NULL, 0x0, + "Data Length", HFILL} + }, + }; + + static gint *ett[] = { + &ett_mwmtp, + }; + + proto_nwmtp = + proto_register_protocol("NexusWare C7 MTP", "MTP over NW UDP", "nw_mtp"); + + proto_register_field_array(proto_nwmtp, hf, array_length(hf)); + proto_register_subtree_array(ett, array_length(ett)); + + nwmtp_handle = register_dissector("nw_mtp", dissect_nwmtp, proto_nwmtp); +} + +void proto_reg_handoff_nwmtp(void) +{ + dissector_add_for_decode_as_with_preference("udp.port", nwmtp_handle); + mtp_handle = find_dissector_add_dependency("mtp3", proto_nwmtp); +} + +/* + * Editor modelines - https://www.wireshark.org/tools/modelines.html + * + * Local variables: + * c-basic-offset: 8 + * tab-width: 8 + * indent-tabs-mode: t + * End: + * + * vi: set shiftwidth=8 tabstop=8 noexpandtab: + * :indentSize=8:tabSize=8:noTabs=false: + */ |