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wireshark/packet-quakeworld.c

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/* packet-quakeworld.c
* Routines for QuakeWorld packet dissection
*
* Uwe Girlich <uwe@planetquake.com>
* http://www.idsoftware.com/q1source/q1source.zip
*
* $Id: packet-quakeworld.c,v 1.1 2001/06/21 15:15:02 girlich Exp $
*
* Ethereal - Network traffic analyzer
* By Gerald Combs <gerald@zing.org>
* Copyright 1998 Gerald Combs
*
* Copied from packet-quake.c
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif
#include <glib.h>
#include "packet.h"
#include "prefs.h"
static int proto_quakeworld = -1;
static int hf_quakeworld_s2c = -1;
static int hf_quakeworld_c2s = -1;
static int hf_quakeworld_connectionless = -1;
static int hf_quakeworld_game = -1;
static int hf_quakeworld_connectionless_marker = -1;
static int hf_quakeworld_connectionless_text = -1;
static int hf_quakeworld_game_seq1 = -1;
static int hf_quakeworld_game_rel1 = -1;
static int hf_quakeworld_game_seq2 = -1;
static int hf_quakeworld_game_rel2 = -1;
static int hf_quakeworld_game_qport = -1;
static gint ett_quakeworld = -1;
static gint ett_quakeworld_connectionless = -1;
static gint ett_quakeworld_game = -1;
static gint ett_quakeworld_game_seq1 = -1;
static gint ett_quakeworld_game_seq2 = -1;
static gint ett_quakeworld_game_clc = -1;
static gint ett_quakeworld_game_svc = -1;
/* I took this name and value directly out of the QW source. */
#define PORT_MASTER 27500
static unsigned int gbl_quakeworldServerPort=PORT_MASTER;
static void
dissect_quakeworld_ConnectionlessPacket(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, int direction)
{
proto_tree *cl_tree = NULL;
proto_item *cl_item = NULL;
guint8 text[2048];
int maxbufsize = 0;
int len;
int offset;
guint32 marker;
marker = tvb_get_ntohl(tvb, 0);
if (tree) {
cl_item = proto_tree_add_text(tree, tvb,
0, tvb_length(tvb), "Connectionless");
if (cl_item)
cl_tree = proto_item_add_subtree(
cl_item, ett_quakeworld_connectionless);
}
if (cl_tree) {
proto_tree_add_uint(cl_tree, hf_quakeworld_connectionless_marker,
tvb, 0, 4, marker);
}
/* all the rest of the packet is just text */
offset = 4;
maxbufsize = MIN((gint)sizeof(text), tvb_length_remaining(tvb, offset));
len = tvb_get_nstringz0(tvb, offset, maxbufsize, text);
if (tree) {
proto_tree_add_string(cl_tree, hf_quakeworld_connectionless_text,
tvb, offset, len + 1, text);
}
offset += len + 1;
/* we should analyse the result 'text' a bit further */
/* for this we need the direction parameter */
}
static void
dissect_quakeworld_client_commands(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
/* If I have too much time at hand, I'll fill it with all
the information from my QWD specs:
http://www.planetquake.com/demospecs/qwd/
*/
dissect_data(tvb, 0, pinfo, tree);
}
static void
dissect_quakeworld_server_commands(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree)
{
/* If I have too much time at hand, I'll fill it with all
the information from my QWD specs:
http://www.planetquake.com/demospecs/qwd/
*/
dissect_data(tvb, 0, pinfo, tree);
}
static const value_string names_reliable[] = {
{ 0, "Non Reliable" },
{ 1, "Reliable" },
{ 0, NULL }
};
static const value_string names_direction[] = {
#define DIR_C2S 0
{ DIR_C2S, "Client to Server" },
#define DIR_S2C 1
{ DIR_S2C, "Server to Client" },
{ 0, NULL }
};
static void
dissect_quakeworld_GamePacket(tvbuff_t *tvb, packet_info *pinfo,
proto_tree *tree, int direction)
{
proto_tree *game_tree = NULL;
proto_item *game_item = NULL;
guint32 seq1;
guint32 seq2;
int rel1;
int rel2;
int offset;
guint rest_length;
direction = (pinfo->destport == gbl_quakeworldServerPort) ?
DIR_C2S : DIR_S2C;
if (tree) {
game_item = proto_tree_add_text(tree, tvb,
0, tvb_length(tvb), "Game");
if (game_item)
game_tree = proto_item_add_subtree(
game_item, ett_quakeworld_game);
}
offset = 0;
seq1 = tvb_get_letohl(tvb, offset);
rel1 = seq1 & 0x80000000 ? 1 : 0;
seq1 &= ~0x80000000;
if (game_tree) {
proto_item *seq1_item = proto_tree_add_text(game_tree,
tvb, offset, 4, "Current Sequence: %u (%s)",
seq1, val_to_str(rel1,names_reliable,"%u"));
if (seq1_item) {
proto_tree *seq1_tree = proto_item_add_subtree(
seq1_item, ett_quakeworld_game_seq1);
proto_tree_add_uint(seq1_tree, hf_quakeworld_game_seq1,
tvb, offset, 4, seq1);
proto_tree_add_boolean(seq1_tree, hf_quakeworld_game_rel1,
tvb, offset+3, 1, rel1);
}
}
offset += 4;
seq2 = tvb_get_letohl(tvb, offset);
rel2 = seq2 & 0x80000000 ? 1 : 0;
seq2 &= ~0x80000000;
if (game_tree) {
proto_item *seq2_item = proto_tree_add_text(game_tree,
tvb, offset, 4, "Acknowledge Sequence: %u (%s)",
seq2, val_to_str(rel2,names_reliable,"%u"));;
if (seq2_item) {
proto_tree *seq2_tree = proto_item_add_subtree(
seq2_item, ett_quakeworld_game_seq2);
proto_tree_add_uint(seq2_tree, hf_quakeworld_game_seq2,
tvb, offset, 4, seq2);
proto_tree_add_boolean(seq2_tree, hf_quakeworld_game_rel2,
tvb, offset+3, 1, rel2);
}
}
offset += 4;
if (direction == DIR_C2S) {
/* client to server */
guint16 qport = tvb_get_letohs(tvb, offset);
if (game_tree) {
proto_tree_add_uint(game_tree, hf_quakeworld_game_qport,
tvb, offset, 2, qport);
}
offset +=2;
}
/* all the rest is pure game data */
rest_length = tvb_reported_length(tvb) - offset;
if (rest_length) {
tvbuff_t *next_tvb =
tvb_new_subset(tvb, offset, rest_length , rest_length);
if (direction == DIR_C2S) {
proto_item *c_item = NULL;
proto_tree *c_tree = NULL;
if (tree) {
c_item = proto_tree_add_text(game_tree, next_tvb,
0, tvb_length(next_tvb),
"Client Commands");
if (c_item) {
c_tree = proto_item_add_subtree(
c_item, ett_quakeworld_game_clc);
}
}
dissect_quakeworld_client_commands(next_tvb, pinfo, c_tree);
}
else {
proto_item *c_item = NULL;
proto_tree *c_tree = NULL;
if (tree) {
c_item = proto_tree_add_text(game_tree, next_tvb,
0, tvb_length(next_tvb),
"Server Commands");
if (c_item) {
c_tree = proto_item_add_subtree(
c_item, ett_quakeworld_game_svc);
}
}
dissect_quakeworld_server_commands(next_tvb, pinfo, c_tree);
}
}
}
static void
dissect_quakeworld(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
proto_tree *quakeworld_tree = NULL;
proto_item *quakeworld_item = NULL;
int direction;
/*
* XXX - this is a conversation dissector, and the code to
* call a conversation dissector doesn't check for disabled
* protocols or set "pinfo->current_proto".
*/
CHECK_DISPLAY_AS_DATA(proto_quakeworld, tvb, pinfo, tree);
direction = (pinfo->destport == gbl_quakeworldServerPort) ?
DIR_C2S : DIR_S2C;
pinfo->current_proto = "QUAKEWORLD";
if (check_col(pinfo->fd, COL_PROTOCOL))
col_set_str(pinfo->fd, COL_PROTOCOL, "QUAKEWORLD");
if (check_col(pinfo->fd, COL_INFO))
col_set_str(pinfo->fd, COL_INFO, val_to_str(direction,
names_direction, "%u"));
if (tree) {
quakeworld_item = proto_tree_add_item(tree, proto_quakeworld,
tvb, 0, tvb_length(tvb), FALSE);
if (quakeworld_item)
quakeworld_tree = proto_item_add_subtree(
quakeworld_item, ett_quakeworld);
if (quakeworld_tree) {
proto_tree_add_uint_format(quakeworld_tree,
direction == DIR_S2C ?
hf_quakeworld_s2c :
hf_quakeworld_c2s,
tvb, 0, 0, 1,
"Direction: %s", val_to_str(direction, names_direction, "%u"));
}
}
if (tvb_get_ntohl(tvb, 0) == 0xffffffff) {
if (check_col(pinfo->fd, COL_INFO)) {
col_append_str(pinfo->fd, COL_INFO, " Connectionless");
}
if (quakeworld_tree)
proto_tree_add_uint_format(quakeworld_tree,
hf_quakeworld_connectionless,
tvb, 0, 0, 1,
"Type: Connectionless");
dissect_quakeworld_ConnectionlessPacket(
tvb, pinfo, quakeworld_tree, direction);
}
else {
if (check_col(pinfo->fd, COL_INFO)) {
col_append_str(pinfo->fd, COL_INFO, " Game");
}
if (quakeworld_tree)
proto_tree_add_uint_format(quakeworld_tree,
hf_quakeworld_game,
tvb, 0, 0, 1,
"Type: Game");
dissect_quakeworld_GamePacket(
tvb, pinfo, quakeworld_tree, direction);
}
}
void
proto_reg_handoff_quakeworld(void)
{
static int Initialized=FALSE;
static int ServerPort=0;
if (Initialized) {
dissector_delete("udp.port", ServerPort, dissect_quakeworld);
} else {
Initialized=TRUE;
}
/* set port for future deletes */
ServerPort=gbl_quakeworldServerPort;
dissector_add("udp.port", gbl_quakeworldServerPort,
dissect_quakeworld, proto_quakeworld);
}
void
proto_register_quakeworld(void)
{
static hf_register_info hf[] = {
{ &hf_quakeworld_c2s,
{ "Client to Server", "quakeworld.c2s",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Client to Server", HFILL }},
{ &hf_quakeworld_s2c,
{ "Server to Client", "quakeworld.s2c",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Server to Client", HFILL }},
{ &hf_quakeworld_connectionless,
{ "Connectionless", "quakeworld.connectionless",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Connectionless", HFILL }},
{ &hf_quakeworld_game,
{ "Game", "quakeworld.game",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Game", HFILL }},
{ &hf_quakeworld_connectionless_marker,
{ "Marker", "quakeworld.connectionless.marker",
FT_UINT32, BASE_HEX, NULL, 0x0,
"Marker", HFILL }},
{ &hf_quakeworld_connectionless_text,
{ "Text", "quakeworld.connectionless.text",
FT_STRING, BASE_DEC, NULL, 0x0,
"Text", HFILL }},
{ &hf_quakeworld_game_seq1,
{ "Sequence Number", "quakeworld.game.seq1",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Sequence number of the current packet", HFILL }},
{ &hf_quakeworld_game_rel1,
{ "Reliable", "quakeworld.game.rel1",
FT_BOOLEAN, BASE_DEC, NULL, 0x0,
"Packet is reliable and may be retransmitted", HFILL }},
{ &hf_quakeworld_game_seq2,
{ "Sequence Number", "quakeworld.game.seq2",
FT_UINT32, BASE_DEC, NULL, 0x0,
"Sequence number of the last received packet", HFILL }},
{ &hf_quakeworld_game_rel2,
{ "Reliable", "quakeworld.game.rel2",
FT_BOOLEAN, BASE_DEC, NULL, 0x0,
"Packet was reliable and may be retransmitted", HFILL }},
{ &hf_quakeworld_game_qport,
{ "QPort", "quakeworld.game.qport",
FT_UINT32, BASE_DEC, NULL, 0x0,
"QuakeWorld Client Port", HFILL }}
};
static gint *ett[] = {
&ett_quakeworld,
&ett_quakeworld_connectionless,
&ett_quakeworld_game,
&ett_quakeworld_game_seq1,
&ett_quakeworld_game_seq2,
&ett_quakeworld_game_clc,
&ett_quakeworld_game_svc
};
module_t *quakeworld_module;
proto_quakeworld = proto_register_protocol("QuakeWorld Network Protocol",
"QUAKEWORLD", "quakeworld");
proto_register_field_array(proto_quakeworld, hf, array_length(hf));
proto_register_subtree_array(ett, array_length(ett));
/* Register a configuration option for port */
quakeworld_module = prefs_register_protocol(proto_quakeworld,
proto_reg_handoff_quakeworld);
prefs_register_uint_preference(quakeworld_module, "udp.port",
"QuakeWorld Server UDP Port",
"Set the UDP port for the QuakeWorld Server",
10, &gbl_quakeworldServerPort);
}
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