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/* packet-ascend.c
* Routines for decoding Lucent/Ascend packet traces
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
#include "config.h"
#include <epan/packet.h>
#include <wiretap/wtap.h>
void proto_register_ascend(void);
void proto_reg_handoff_ascend(void);
static int proto_ascend;
static int hf_link_type;
static int hf_session_id;
static int hf_called_number;
static int hf_chunk;
static int hf_task;
static int hf_user_name;
static int ett_raw;
static const value_string encaps_vals[] = {
{ASCEND_PFX_WDS_X, "PPP Transmit" },
{ASCEND_PFX_WDS_R, "PPP Receive" },
{ASCEND_PFX_WDD, "Ethernet triggering dialout"},
{ASCEND_PFX_ISDN_X, "ISDN Transmit" },
{ASCEND_PFX_ISDN_R, "ISDN Receive" },
{ASCEND_PFX_ETHER, "Ethernet" },
{0, NULL }
};
static dissector_handle_t ascend_handle;
static dissector_handle_t eth_withoutfcs_handle;
static dissector_handle_t ppp_hdlc_handle;
static dissector_handle_t lapd_phdr_handle;
static int
dissect_ascend(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
proto_tree *fh_tree;
proto_item *ti, *hidden_item;
union wtap_pseudo_header *pseudo_header = pinfo->pseudo_header;
struct isdn_phdr isdn;
/* load the top pane info. This should be overwritten by
the next protocol in the stack */
col_set_str(pinfo->cinfo, COL_RES_DL_SRC, "N/A");
col_set_str(pinfo->cinfo, COL_RES_DL_DST, "N/A");
col_set_str(pinfo->cinfo, COL_PROTOCOL, "N/A");
col_set_str(pinfo->cinfo, COL_INFO, "Lucent/Ascend packet trace");
/* If this is a transmitted or received PPP frame, set the PPP direction. */
switch (pseudo_header->ascend.type) {
case ASCEND_PFX_WDS_X:
pinfo->p2p_dir = P2P_DIR_SENT;
break;
case ASCEND_PFX_WDS_R:
pinfo->p2p_dir = P2P_DIR_RECV;
break;
}
/* populate a tree in the second pane with the status of the link
layer (ie none) */
if(tree) {
ti = proto_tree_add_protocol_format(tree, proto_ascend, tvb, 0, 0,
"Lucent/Ascend packet trace");
fh_tree = proto_item_add_subtree(ti, ett_raw);
proto_tree_add_uint(fh_tree, hf_link_type, tvb, 0, 0,
pseudo_header->ascend.type);
switch (pseudo_header->ascend.type) {
case ASCEND_PFX_WDD:
/* Ethernet packet forcing a call */
proto_tree_add_string(fh_tree, hf_called_number, tvb, 0, 0,
pseudo_header->ascend.call_num);
proto_tree_add_uint(fh_tree, hf_chunk, tvb, 0, 0,
pseudo_header->ascend.chunk);
hidden_item = proto_tree_add_uint(fh_tree, hf_session_id, tvb, 0, 0, 0);
proto_item_set_hidden(hidden_item);
break;
case ASCEND_PFX_WDS_X:
case ASCEND_PFX_WDS_R:
/* wandsession data */
proto_tree_add_string(fh_tree, hf_user_name, tvb, 0, 0,
pseudo_header->ascend.user);
proto_tree_add_uint(fh_tree, hf_session_id, tvb, 0, 0,
pseudo_header->ascend.sess);
hidden_item = proto_tree_add_uint(fh_tree, hf_chunk, tvb, 0, 0, 0);
proto_item_set_hidden(hidden_item);
break;
default:
break;
}
proto_tree_add_uint(fh_tree, hf_task, tvb, 0, 0, pseudo_header->ascend.task);
}
switch (pseudo_header->ascend.type) {
case ASCEND_PFX_WDS_X:
case ASCEND_PFX_WDS_R:
call_dissector(ppp_hdlc_handle, tvb, pinfo, tree);
break;
case ASCEND_PFX_WDD:
case ASCEND_PFX_ETHER:
call_dissector(eth_withoutfcs_handle, tvb, pinfo, tree);
break;
case ASCEND_PFX_ISDN_X:
isdn.uton = true;
isdn.channel = 0;
call_dissector_with_data(lapd_phdr_handle, tvb, pinfo, tree, &isdn);
break;
case ASCEND_PFX_ISDN_R:
isdn.uton = false;
isdn.channel = 0;
call_dissector_with_data(lapd_phdr_handle, tvb, pinfo, tree, &isdn);
break;
default:
break;
}
return tvb_captured_length(tvb);
}
void
proto_register_ascend(void)
{
static hf_register_info hf[] = {
{ &hf_link_type,
{ "Link type", "ascend.type", FT_UINT32, BASE_DEC, VALS(encaps_vals), 0x0,
NULL, HFILL }},
{ &hf_session_id,
{ "Session ID", "ascend.sess", FT_UINT32, BASE_DEC, NULL, 0x0,
NULL, HFILL }},
{ &hf_called_number,
{ "Called number", "ascend.number", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
{ &hf_chunk,
{ "WDD Chunk", "ascend.chunk", FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_task,
{ "Task", "ascend.task", FT_UINT32, BASE_HEX, NULL, 0x0,
NULL, HFILL }},
{ &hf_user_name,
{ "User name", "ascend.user", FT_STRING, BASE_NONE, NULL, 0x0,
NULL, HFILL }},
};
static int *ett[] = {
&ett_raw,
};
proto_ascend = proto_register_protocol("Lucent/Ascend debug output",
"Lucent/Ascend", "ascend");
proto_register_field_array(proto_ascend, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
ascend_handle = register_dissector("ascend", dissect_ascend, proto_ascend);
}
void
proto_reg_handoff_ascend(void)
{
/*
* Get handles for the Ethernet, PPP-in-HDLC-like-framing, and
* LAPD-with-pseudoheader dissectors.
*/
eth_withoutfcs_handle = find_dissector_add_dependency("eth_withoutfcs", proto_ascend);
ppp_hdlc_handle = find_dissector_add_dependency("ppp_hdlc", proto_ascend);
lapd_phdr_handle = find_dissector_add_dependency("lapd-phdr", proto_ascend);
dissector_add_uint("wtap_encap", WTAP_ENCAP_ASCEND, ascend_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* 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:
*/
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