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