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/* packet-idp.c
* Routines for XNS IDP
* Based on the Netware IPX dissector by Gilbert Ramirez <gram@alumni.rice.edu>
*
* 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 "packet-idp.h"
#include <epan/etypes.h>
#include <epan/unit_strings.h>
void proto_register_idp(void);
void proto_reg_handoff_idp(void);
static dissector_handle_t idp_handle;
static int proto_idp;
static int hf_idp_checksum;
static int hf_idp_len;
/* static int hf_idp_src; */
/* static int hf_idp_dst; */
static int hf_idp_hops;
static int hf_idp_packet_type;
static int hf_idp_dnet;
static int hf_idp_dnode;
static int hf_idp_dsocket;
static int hf_idp_snet;
static int hf_idp_snode;
static int hf_idp_ssocket;
static int ett_idp;
static dissector_table_t idp_type_dissector_table;
/*
* See
*
* "Internet Transport Protocols", XSIS 028112, December 1981
*
* if you can find it; this is based on the headers in the BSD XNS
* implementation.
*/
#define IDP_HEADER_LEN 30 /* It's *always* 30 bytes */
static const value_string idp_packet_type_vals[] = {
{ IDP_PACKET_TYPE_RIP, "RIP" },
{ IDP_PACKET_TYPE_ECHO, "Echo" },
{ IDP_PACKET_TYPE_ERROR, "Error" },
{ IDP_PACKET_TYPE_PEP, "PEP" },
{ IDP_PACKET_TYPE_SPP, "SPP" },
{ 0, NULL }
};
static const value_string idp_socket_vals[] = {
{ IDP_SOCKET_SMB, "SMB" },
{ 0, NULL }
};
static int
dissect_idp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *idp_tree;
proto_item *ti;
uint16_t length;
uint8_t type;
tvbuff_t *next_tvb;
col_set_str(pinfo->cinfo, COL_PROTOCOL, "IDP");
col_clear(pinfo->cinfo, COL_INFO);
ti = proto_tree_add_item(tree, proto_idp, tvb, 0, IDP_HEADER_LEN, ENC_NA);
idp_tree = proto_item_add_subtree(ti, ett_idp);
proto_tree_add_checksum(idp_tree, tvb, 0, hf_idp_checksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
length = tvb_get_ntohs(tvb, 2);
proto_tree_add_uint(idp_tree, hf_idp_len, tvb, 2, 2, length);
/* Adjust the tvbuff length to include only the IDP datagram. */
set_actual_length(tvb, length);
proto_tree_add_item(idp_tree, hf_idp_hops, tvb, 4, 1, ENC_BIG_ENDIAN);
type = tvb_get_uint8(tvb, 5);
proto_tree_add_uint(idp_tree, hf_idp_packet_type, tvb, 5, 1, type);
pinfo->ptype = PT_IDP;
/* Destination */
proto_tree_add_item(idp_tree, hf_idp_dnet, tvb, 6, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(idp_tree, hf_idp_dnode, tvb, 10, 6, ENC_NA);
pinfo->destport = tvb_get_ntohs(tvb, 16);
proto_tree_add_uint(idp_tree, hf_idp_dsocket, tvb, 16, 2,
pinfo->destport);
/* Source */
proto_tree_add_item(idp_tree, hf_idp_snet, tvb, 18, 4, ENC_BIG_ENDIAN);
proto_tree_add_item(idp_tree, hf_idp_snode, tvb, 22, 6, ENC_NA);
pinfo->srcport = tvb_get_ntohs(tvb, 28);
proto_tree_add_uint(idp_tree, hf_idp_ssocket, tvb, 28, 2,
pinfo->srcport);
/* Make the next tvbuff */
next_tvb = tvb_new_subset_remaining(tvb, IDP_HEADER_LEN);
/*
* Hand off to the dissector for the packet type.
*/
if (!dissector_try_uint(idp_type_dissector_table, type, next_tvb,
pinfo, tree))
{
call_data_dissector(next_tvb, pinfo, tree);
}
return tvb_captured_length(tvb);
}
void
proto_register_idp(void)
{
static hf_register_info hf_idp[] = {
{ &hf_idp_checksum,
{ "Checksum", "idp.checksum", FT_UINT16, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
#if 0
{ &hf_idp_src,
{ "Source Address", "idp.src", FT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
#endif
#if 0
{ &hf_idp_dst,
{ "Destination Address", "idp.dst", FT_STRING, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
#endif
{ &hf_idp_len,
{ "Length", "idp.len", FT_UINT16, BASE_DEC|BASE_UNIT_STRING,
UNS(&units_byte_bytes), 0x0, NULL, HFILL }},
/* XXX - does this have separate hop count and time subfields? */
{ &hf_idp_hops,
{ "Transport Control (Hops)", "idp.hops", FT_UINT8, BASE_DEC,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_packet_type,
{ "Packet Type", "idp.packet_type", FT_UINT8, BASE_DEC,
VALS(idp_packet_type_vals), 0x0, NULL, HFILL }},
{ &hf_idp_dnet,
{ "Destination Network","idp.dst.net", FT_UINT32, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_dnode,
{ "Destination Node", "idp.dst.node", FT_ETHER, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_dsocket,
{ "Destination Socket", "idp.dst.socket", FT_UINT16, BASE_HEX,
VALS(idp_socket_vals), 0x0, NULL, HFILL }},
{ &hf_idp_snet,
{ "Source Network","idp.src.net", FT_UINT32, BASE_HEX,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_snode,
{ "Source Node", "idp.src.node", FT_ETHER, BASE_NONE,
NULL, 0x0, NULL, HFILL }},
{ &hf_idp_ssocket,
{ "Source Socket", "idp.src.socket", FT_UINT16, BASE_HEX,
VALS(idp_socket_vals), 0x0, NULL, HFILL }},
};
static int *ett[] = {
&ett_idp,
};
proto_idp = proto_register_protocol("Internetwork Datagram Protocol",
"IDP", "idp");
proto_register_field_array(proto_idp, hf_idp, array_length(hf_idp));
proto_register_subtree_array(ett, array_length(ett));
idp_type_dissector_table = register_dissector_table("idp.packet_type",
"IDP packet type", proto_idp, FT_UINT8, BASE_DEC);
idp_handle = register_dissector("idp", dissect_idp, proto_idp);
}
void
proto_reg_handoff_idp(void)
{
dissector_add_uint("ethertype", ETHERTYPE_XNS_IDP, idp_handle);
dissector_add_uint("chdlc.protocol", ETHERTYPE_XNS_IDP, idp_handle);
}
/*
* 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:
*/
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