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/* packet-tivoconnect.c
* Routines for TiVoConnect Discovery Protocol dissection
* Copyright 2006, Kees Cook <kees@outflux.net>
* IANA UDP/TCP port: 2190 (tivoconnect)
* Protocol Spec: http://tivo.com/developer/i/TiVoConnectDiscovery.pdf
*
* IANA's full name is "TiVoConnect Beacon", where as TiVo's own
* documentation calls this protocol "TiVoConnect Discovery Protocol".
*
* Wireshark - Network traffic analyzer
* By Gerald Combs <gerald@wireshark.org>
* Copyright 1998 Gerald Combs
*
* SPDX-License-Identifier: GPL-2.0-or-later
*/
/*
* TODO
* - split services into a subtree
* - split platform into a subtree
*
*/
#include "config.h"
#include <epan/packet.h>
void proto_reg_handoff_tivoconnect(void);
void proto_register_tivoconnect(void);
static dissector_handle_t tivoconnect_tcp_handle;
static dissector_handle_t tivoconnect_udp_handle;
#define TIVOCONNECT_PORT 2190
static int proto_tivoconnect;
static int hf_tivoconnect_flavor;
static int hf_tivoconnect_method;
static int hf_tivoconnect_platform;
static int hf_tivoconnect_machine;
static int hf_tivoconnect_identity;
static int hf_tivoconnect_services;
static int hf_tivoconnect_version;
static int ett_tivoconnect;
static int
dissect_tivoconnect(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, bool is_tcp)
{
/* parsing variables */
char * string;
int length;
/* value strings */
const char * proto_name;
char * packet_identity = NULL;
char * packet_machine = NULL;
/* validate that we have a tivoconnect packet */
if ( tvb_strncaseeql(tvb, 0, "tivoconnect", 11) != 0) {
return 0;
}
length = tvb_captured_length(tvb);
string = (char*)tvb_get_string_enc(pinfo->pool, tvb, 0, length, ENC_ASCII);
/* Make entries in Protocol column and Info column on summary display */
col_set_str(pinfo->cinfo, COL_PROTOCOL, "TiVoConnect");
/* make a distinction between UDP and TCP packets */
proto_name = is_tcp ? "Discovery Connection" : "Discovery Beacon";
col_set_str(pinfo->cinfo, COL_INFO, proto_name);
/* if (tree) */ {
/* Set up structures needed to add the protocol subtree and manage it */
proto_item *ti;
proto_tree *tivoconnect_tree;
/* parsing variables */
unsigned offset = 0;
char * field;
/* create display subtree for the protocol */
ti = proto_tree_add_item(tree, proto_tivoconnect, tvb, 0, -1, ENC_NA);
tivoconnect_tree = proto_item_add_subtree(ti, ett_tivoconnect);
/* process the packet */
for ( field = strtok(string, "\n");
field;
offset += length, field = strtok(NULL, "\n") ) {
char * value;
int fieldlen;
length = (int)strlen(field) + 1;
if ( !(value = strchr(field, '=')) ) {
/* bad packet: missing the field separator */
continue;
}
*value++ = '\0';
fieldlen = (int)strlen(field) + 1;
if ( g_ascii_strcasecmp(field, "tivoconnect") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_flavor, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
}
else if ( g_ascii_strcasecmp(field, "method") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_method, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
}
else if ( g_ascii_strcasecmp(field, "platform") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_platform, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
}
else if ( g_ascii_strcasecmp(field, "machine") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_machine, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
packet_machine = value;
}
else if ( g_ascii_strcasecmp(field, "identity") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_identity, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
packet_identity = value;
}
else if ( g_ascii_strcasecmp(field, "services") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_services, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
}
else if ( g_ascii_strcasecmp(field, "swversion") == 0 ) {
proto_tree_add_item(tivoconnect_tree,
hf_tivoconnect_version, tvb, offset+fieldlen,
length-fieldlen-1, ENC_ASCII);
}
else {
/* unknown field! */
}
}
/* Adjust "Info" column and top of tree into more useful info */
if (packet_machine) {
proto_item_append_text(ti, ", %s", packet_machine);
col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s",
proto_name, packet_machine);
}
if (packet_identity) {
proto_item_append_text(ti,
packet_machine ? " (%s)" : ", ID:%s",
packet_identity);
if (packet_machine) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s %s (%s)",
proto_name, packet_machine, packet_identity);
}
else {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s ID:%s",
proto_name, packet_identity);
}
}
}
return tvb_reported_length(tvb);
}
static int
dissect_tivoconnect_tcp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return dissect_tivoconnect(tvb, pinfo, tree, true);
}
static int
dissect_tivoconnect_udp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void *data _U_)
{
return dissect_tivoconnect(tvb, pinfo, tree, false);
}
void
proto_register_tivoconnect(void)
{
static hf_register_info hf[] = {
{ &hf_tivoconnect_flavor,
{ "Flavor", "tivoconnect.flavor",
FT_STRINGZ, BASE_NONE, NULL, 0,
"Protocol Flavor supported by the originator", HFILL }},
{ &hf_tivoconnect_method,
{ "Method", "tivoconnect.method",
FT_STRINGZ, BASE_NONE, NULL, 0,
"Packet was delivered via UDP(broadcast) or TCP(connected)", HFILL }},
{ &hf_tivoconnect_platform,
{ "Platform", "tivoconnect.platform",
FT_STRINGZ, BASE_NONE, NULL, 0,
"System platform, either tcd(TiVo) or pc(Computer)", HFILL }},
{ &hf_tivoconnect_machine,
{ "Machine", "tivoconnect.machine",
FT_STRINGZ, BASE_NONE, NULL, 0,
"Human-readable system name", HFILL }},
{ &hf_tivoconnect_identity,
{ "Identity", "tivoconnect.identity",
FT_STRINGZ, BASE_NONE, NULL, 0,
"Unique serial number for the system", HFILL }},
{ &hf_tivoconnect_services,
{ "Services", "tivoconnect.services",
FT_STRINGZ, BASE_NONE, NULL, 0,
"List of available services on the system", HFILL }},
{ &hf_tivoconnect_version,
{ "Version", "tivoconnect.version",
FT_STRINGZ, BASE_NONE, NULL, 0,
"System software version", HFILL }},
};
static int *ett[] = {
&ett_tivoconnect,
};
proto_tivoconnect = proto_register_protocol("TiVoConnect Discovery Protocol",
"TiVoConnect", "tivoconnect");
proto_register_field_array(proto_tivoconnect, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
tivoconnect_tcp_handle = register_dissector("tivo.tcp", dissect_tivoconnect_tcp, proto_tivoconnect);
tivoconnect_udp_handle = register_dissector("tivo.udp", dissect_tivoconnect_udp, proto_tivoconnect);
}
void
proto_reg_handoff_tivoconnect(void)
{
dissector_add_uint_with_preference("udp.port", TIVOCONNECT_PORT, tivoconnect_udp_handle);
dissector_add_uint_with_preference("tcp.port", TIVOCONNECT_PORT, tivoconnect_tcp_handle);
}
/*
* Editor modelines - https://www.wireshark.org/tools/modelines.html
*
* Local variables:
* c-basic-offset: 4
* tab-width: 8
* indent-tabs-mode: nil
* End:
*
* vi: set shiftwidth=4 tabstop=8 expandtab:
* :indentSize=4:tabSize=8:noTabs=true:
*/
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