path: root/epan/dissectors/packet-quake2.c

/* packet-quake2.c
 * Routines for Quake II packet dissection
 *
 * Uwe Girlich <uwe@planetquake.com>
 * http://www.idsoftware.com/q1source/q1source.zip
 * http://www.planetquake.com/demospecs/dm2
 * http://www.dgs.monash.edu.au/~timf/bottim/
 * http://www.opt-sci.Arizona.EDU/Pandora/default.asp
 *
 * Wireshark - Network traffic analyzer
 * By Gerald Combs <gerald@wireshark.org>
 * Copyright 1998 Gerald Combs
 *
 * Copied from packet-quakeworld.c
 *
 * SPDX-License-Identifier: GPL-2.0-or-later
 */

#include "config.h"

#include <epan/packet.h>
#include <epan/prefs.h>

void proto_register_quake2(void);
void proto_reg_handoff_quake2(void);

static dissector_handle_t quake2_handle;

static int proto_quake2;

static int hf_quake2_s2c;
static int hf_quake2_c2s;
static int hf_quake2_connectionless;
static int hf_quake2_game;
static int hf_quake2_userinfo;
static int hf_quake2_command;
static int hf_quake2_connectionless_marker;
static int hf_quake2_connectionless_text;
static int hf_quake2_game_seq1;
static int hf_quake2_game_rel1;
static int hf_quake2_game_seq2;
static int hf_quake2_game_rel2;
static int hf_quake2_game_qport;
static int hf_quake2_game_client_command;
static int hf_quake2_game_server_command;
static int hf_quake2_game_client_command_move;
static int hf_quake2_game_client_command_move_chksum;
static int hf_quake2_game_client_command_move_lframe;
static int hf_quake2_game_client_command_move_bitfield_angles1;
static int hf_quake2_game_client_command_move_bitfield_angles2;
static int hf_quake2_game_client_command_move_bitfield_angles3;
static int hf_quake2_game_client_command_move_bitfield_movement_fwd;
static int hf_quake2_game_client_command_move_bitfield_movement_side;
static int hf_quake2_game_client_command_move_bitfield_movement_up;
static int hf_quake2_game_client_command_move_bitfield_buttons;
static int hf_quake2_game_client_command_move_bitfield_impulse;
static int hf_quake2_game_client_command_move_msec;
static int hf_quake2_game_client_command_move_lightlevel;

static int ett_quake2;
static int ett_quake2_connectionless;
static int ett_quake2_game;
static int ett_quake2_game_seq1;
static int ett_quake2_game_seq2;
static int ett_quake2_game_clc;
static int ett_quake2_game_svc;
static int ett_quake2_game_clc_cmd;
static int ett_quake2_game_svc_cmd;
static int ett_quake2_game_clc_cmd_move_bitfield;
static int ett_quake2_game_clc_cmd_move_moves;


#define PORT_MASTER 27910 /* Not IANA registered */
static range_t *gbl_quake2ServerPorts;


static void
dissect_quake2_ConnectionlessPacket(tvbuff_t *tvb, packet_info *pinfo _U_,
        proto_tree *tree, int direction _U_)
{
    proto_tree *cl_tree;
    int  len;
    int  offset;

    uint32_t marker;

    marker = tvb_get_ntohl(tvb, 0);
    cl_tree = proto_tree_add_subtree(tree, tvb,
            0, -1, ett_quake2_connectionless, NULL, "Connectionless");
    proto_tree_add_uint(cl_tree, hf_quake2_connectionless_marker,
            tvb, 0, 4, marker);

    /* all the rest of the packet is just text */
    offset = 4;

    len = tvb_captured_length_remaining(tvb, offset);
    proto_tree_add_item(cl_tree, hf_quake2_connectionless_text,
            tvb, offset, len, ENC_ASCII);
    /*offset += len;*/

    /* we should analyse the result 'text' a bit further */
    /* for this we need the direction parameter */
}

static const value_string hf_quake2_game_client_command_move_vals[] = {
    { 0x00,   "-"   },
    { 0x01,   "set" },
    { 0, NULL }
};

static int
dissect_quake2_client_commands_move(tvbuff_t *tvb, packet_info *pinfo _U_,
        proto_tree *tree)
{
#define MOVES 3  /* 3 updates per command */

    /* taken from qcommon.h */
#define CM_ANGLE1   (1<<0)
#define CM_ANGLE2   (1<<1)
#define CM_ANGLE3   (1<<2)
#define CM_FORWARD  (1<<3)
#define CM_SIDE     (1<<4)
#define CM_UP       (1<<5)
#define CM_BUTTONS  (1<<6)
#define CM_IMPULSE  (1<<7)
    /* qshared.h */
#define BUTTON_ATTACK  1
#define BUTTON_USE 2
#define BUTTON_ANY 128

    uint32_t lastframe;
    int i, offset = 0;
    enum { Q_OFFSET, Q_VALUE, Q_SIZE };
    struct movement {
        uint8_t bits[Q_SIZE];
        uint16_t angles[3][Q_SIZE];
        int16_t movement[3][Q_SIZE];
        uint8_t buttons[Q_SIZE];
        uint8_t lightlevel[Q_SIZE];
        uint8_t msec[Q_SIZE];
        uint8_t impulse[Q_SIZE];
    } move[MOVES+1];

    offset++;
    lastframe = tvb_get_letohl(tvb, offset);
    offset += 4;

    for (i=0; i < MOVES; i++) {
        move[i].bits[Q_VALUE] = tvb_get_uint8(tvb, offset);
        move[i].bits[Q_OFFSET] = offset;
        offset++;
        if (move[i].bits[Q_VALUE] & CM_ANGLE1) {
            move[i].angles[0][Q_VALUE] = tvb_get_letohs(tvb, offset);
            move[i].angles[0][Q_OFFSET] = offset;
            offset += 2;
        }
        if (move[i].bits[Q_VALUE] & CM_ANGLE2) {
            move[i].angles[1][Q_VALUE] = tvb_get_letohs(tvb, offset);
            move[i].angles[1][Q_OFFSET] = offset;
            offset += 2;
        }
        if (move[i].bits[Q_VALUE] & CM_ANGLE3) {
            move[i].angles[2][Q_VALUE] = tvb_get_letohs(tvb, offset);
            move[i].angles[2][Q_OFFSET] = offset;
            offset += 2;
        }
        if (move[i].bits[Q_VALUE] & CM_FORWARD) {
            move[i].movement[0][Q_VALUE] = tvb_get_letohs(tvb, offset);
            move[i].movement[0][Q_OFFSET] = offset;
            offset += 2;
        }
        if (move[i].bits[Q_VALUE] & CM_SIDE) {
            move[i].movement[1][Q_VALUE] = tvb_get_letohs(tvb, offset);
            move[i].movement[1][Q_OFFSET] = offset;
            offset += 2;
        }
        if (move[i].bits[Q_VALUE] & CM_UP) {
            move[i].movement[2][Q_VALUE] = tvb_get_letohs(tvb, offset);
            move[i].movement[2][Q_OFFSET] = offset;
            offset += 2;
        }
        if (move[i].bits[Q_VALUE] & CM_BUTTONS) {
            move[i].buttons[Q_VALUE] = tvb_get_uint8(tvb, offset);
            move[i].buttons[Q_OFFSET] = offset;
            offset++;
        }
        if (move[i].bits[Q_VALUE] & CM_IMPULSE) {
            move[i].impulse[Q_VALUE] = tvb_get_uint8(tvb, offset);
            move[i].impulse[Q_OFFSET] = offset;
            offset++;
        }

        move[i].msec[Q_VALUE] = tvb_get_uint8(tvb, offset);
        move[i].msec[Q_OFFSET] = offset;
        offset++;
        move[i].lightlevel[Q_VALUE] = tvb_get_uint8(tvb, offset);
        move[i].lightlevel[Q_OFFSET] = offset;
        offset++;
    }

    if (!tree)
        return offset;

    proto_tree_add_checksum(tree, tvb, 0, hf_quake2_game_client_command_move_chksum, -1, NULL, pinfo, 0, ENC_BIG_ENDIAN, PROTO_CHECKSUM_NO_FLAGS);
    proto_tree_add_uint(tree, hf_quake2_game_client_command_move_lframe, tvb,
            1, 4, lastframe);

    move[MOVES].bits[Q_OFFSET] = offset;
    for (i=0; i < MOVES; i++) {
        proto_item *movebits_item, *bit_item;
        proto_item *sub_tree, *field_tree;
#define SHORT2ANGLE(x) ((float)x/65536.0*360.0)

        sub_tree = proto_tree_add_subtree_format(tree,
                tvb,
                move[i].bits[Q_OFFSET],
                move[i+1].bits[Q_OFFSET]-move[i].bits[Q_OFFSET],
                ett_quake2_game_clc_cmd_move_moves, NULL, "Move %u", i+1);

        movebits_item =
            proto_tree_add_uint(sub_tree, hf_quake2_game_client_command_move,
                    tvb,
                    move[i].bits[Q_OFFSET],
                    1,
                    move[i].bits[Q_VALUE]);

        proto_tree_add_uint(sub_tree,
                hf_quake2_game_client_command_move_msec,
                tvb, move[i].msec[Q_OFFSET], 1, move[i].msec[Q_VALUE]);
        proto_tree_add_uint(sub_tree,
                hf_quake2_game_client_command_move_lightlevel,
                tvb, move[i].lightlevel[Q_OFFSET], 1, move[i].lightlevel[Q_VALUE]);

        if (move[i].bits[Q_VALUE] == 0) {
            proto_item_append_text(movebits_item, " (no moves)");
            continue;
        }

        field_tree = proto_item_add_subtree(movebits_item,
                ett_quake2_game_clc_cmd_move_bitfield);

        if (move[i].bits[Q_VALUE] & CM_ANGLE1) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_angles1, tvb,
                    move[i].angles[0][Q_OFFSET], 2, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%d", move[i].angles[0][Q_VALUE]);
            proto_item_append_text(bit_item, " = %.2f deg)",
                    SHORT2ANGLE(move[i].angles[0][Q_VALUE]));
        }

        if (move[i].bits[Q_VALUE] & CM_ANGLE2) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_angles2, tvb,
                    move[i].angles[1][Q_OFFSET], 2, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%d", move[i].angles[1][Q_VALUE]);
            proto_item_append_text(bit_item, " = %.2f deg)",
                    SHORT2ANGLE(move[i].angles[1][Q_VALUE]));
        }
        if (move[i].bits[Q_VALUE] & CM_ANGLE3) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_angles3, tvb,
                    move[i].angles[2][Q_OFFSET], 2, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%d", move[i].angles[2][Q_VALUE]);
            proto_item_append_text(bit_item, " = %.2f deg)",
                    SHORT2ANGLE(move[i].angles[2][Q_VALUE]));
        }
        if (move[i].bits[Q_VALUE] & CM_FORWARD) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_movement_fwd, tvb,
                    move[i].movement[0][Q_OFFSET], 2, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%hd)",
                    move[i].movement[0][Q_VALUE]);
        }
        if (move[i].bits[Q_VALUE] & CM_SIDE) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_movement_side, tvb,
                    move[i].movement[1][Q_OFFSET], 2, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%hd)",
                    move[i].movement[1][Q_VALUE]);
        }
        if (move[i].bits[Q_VALUE] & CM_UP) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_movement_up, tvb,
                    move[i].movement[2][Q_OFFSET], 2, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%hd)",
                    move[i].movement[2][Q_VALUE]);
        }
        if (move[i].bits[Q_VALUE] & CM_BUTTONS) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_buttons, tvb,
                    move[i].buttons[Q_OFFSET], 1, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%d)",
                    move[i].buttons[Q_VALUE]);
            if (move[i].buttons[Q_VALUE] & BUTTON_ATTACK)
                proto_item_append_text(bit_item, " (Attack)");
            if (move[i].buttons[Q_VALUE] & BUTTON_USE)
                proto_item_append_text(bit_item, " (Use)");
            if (move[i].buttons[Q_VALUE] & BUTTON_ANY)
                proto_item_append_text(bit_item, " (Any)");
        }
        if (move[i].bits[Q_VALUE] & CM_IMPULSE) {
            bit_item = proto_tree_add_uint(field_tree,
                    hf_quake2_game_client_command_move_bitfield_impulse, tvb,
                    move[i].impulse[Q_OFFSET], 1, move[i].bits[Q_VALUE]);
            proto_item_append_text(bit_item, " (%d)",
                    move[i].impulse[Q_VALUE]);
        }

    }

    return offset;
}

static int
dissect_quake2_client_commands_uinfo(tvbuff_t *tvb, packet_info *pinfo _U_,
        proto_tree *tree)
{
    unsigned len;

    len = tvb_strsize(tvb, 0);

    proto_tree_add_item(tree, hf_quake2_userinfo, tvb, 0, len, ENC_NA|ENC_ASCII);

    return len;
}

static int
dissect_quake2_client_commands_stringcmd(tvbuff_t *tvb, packet_info *pinfo _U_,
        proto_tree *tree)
{
    unsigned len;

    len = tvb_strsize(tvb, 0);

    proto_tree_add_item(tree, hf_quake2_command, tvb, 0, len, ENC_NA|ENC_ASCII);

    return len;
}

static const value_string names_client_cmd[] = {
 /* qcommon.h */
#define CLC_BAD 0
    { CLC_BAD, "clc_bad" },
#define CLC_NOP 1
    { CLC_NOP, "clc_nop" },
#define CLC_MOVE 2
    { CLC_MOVE, "clc_move" },
#define CLC_USERINFO 3
    { CLC_USERINFO, "clc_userinfo" },
#define CLC_STRINGCMD 4
    { CLC_STRINGCMD, "clc_stringcmd" },
    { 0, NULL }
};

static void
dissect_quake2_client_commands(tvbuff_t *tvb, packet_info *pinfo,
        proto_tree *tree)
{
    proto_tree *clc_tree = NULL;
    tvbuff_t   *next_tvb   = NULL;
    uint8_t     client_cmd_type;
    proto_item *cmd_type_item;
    unsigned    rest_length = 0;
    int         offset      = 0;

    do {
        client_cmd_type = tvb_get_uint8(tvb, offset);

        cmd_type_item = proto_tree_add_uint(tree,
                hf_quake2_game_client_command, tvb, offset, 1,
                client_cmd_type);

        proto_item_append_text(cmd_type_item, " (%s)",
                val_to_str(client_cmd_type, names_client_cmd, "%u"));
        clc_tree = proto_item_add_subtree(cmd_type_item, ett_quake2_game_clc_cmd);

        offset++;
        rest_length = tvb_reported_length(tvb) - offset;
        if (rest_length)
            next_tvb = tvb_new_subset_remaining(tvb, offset);
        else
            return;

        rest_length = 0;
        switch (client_cmd_type) {
            case CLC_BAD:
                break;
            case CLC_NOP:
                break;
            case CLC_MOVE:
                rest_length =
                    dissect_quake2_client_commands_move(next_tvb,
                            pinfo, clc_tree);
                break;
            case CLC_USERINFO:
                rest_length =
                    dissect_quake2_client_commands_uinfo(next_tvb,
                            pinfo, clc_tree);
                break;
            case CLC_STRINGCMD:
                rest_length =
                    dissect_quake2_client_commands_stringcmd(next_tvb,
                            pinfo, clc_tree);
                break;
            default:
                break;
        }
        offset += rest_length;
    } while (tvb_reported_length(tvb) - offset > 0);
}

static const value_string names_server_cmd[] = {
    /* qcommon.h */
#define SVC_BAD 0
    { SVC_BAD, "svc_bad" },
#define SVC_MUZZLEFLASH 1
    { SVC_MUZZLEFLASH, "svc_muzzleflash" },
#define SVC_MUZZLEFLASH2 2
    { SVC_MUZZLEFLASH2, "svc_muzzleflash2" },
#define SVC_TEMP_ENTITY 3
    { SVC_TEMP_ENTITY, "svc_temp_entity" },
#define SVC_LAYOUT 4
    { SVC_LAYOUT, "svc_layout" },
#define SVC_INVENTORY 5
    { SVC_INVENTORY, "svc_inventory" },
#define SVC_NOP 6
    { SVC_NOP, "svc_nop" },
#define SVC_DISCONNECT 7
    { SVC_DISCONNECT, "svc_disconnect" },
#define SVC_RECONNECT 8
    { SVC_RECONNECT, "svc_reconnect" },
#define SVC_SOUND 9
    { SVC_SOUND, "svc_sound" },
#define SVC_PRINT 10
    { SVC_PRINT, "svc_print" },
#define SVC_STUFFTEXT 11
    { SVC_STUFFTEXT, "svc_stufftext" },
#define SVC_SERVERDATA 12
    { SVC_SERVERDATA, "svc_serverdata" },
#define  SVC_CONFIGSTRING 13
    { SVC_CONFIGSTRING, "svc_configstring" },
#define SVC_SPAWNBASELINE 14
    { SVC_SPAWNBASELINE, "svc_spawnbaseline" },
#define SVC_CENTERPRINT 15
    { SVC_CENTERPRINT, "svc_centerprint" },
#define SVC_DOWNLOAD 16
    { SVC_DOWNLOAD, "svc_download" },
#define SVC_PLAYERINFO 17
    { SVC_PLAYERINFO, "svc_playerinfo" },
#define SVC_PACKETENTITIES 18
    { SVC_PACKETENTITIES, "svc_packetentities" },
#define SVC_DELTAPACKETENTITIES 19
    { SVC_DELTAPACKETENTITIES, "svc_deltapacketentities" },
#define SVC_FRAME 20
    { SVC_FRAME, "svc_frame" },
    { 0, NULL }
};

static void
dissect_quake2_server_commands(tvbuff_t *tvb, packet_info *pinfo,
        proto_tree *tree)
{
    tvbuff_t   *next_tvb = NULL;
    uint8_t     server_cmd_type;
    proto_item *cmd_type_item;
    unsigned    rest_length = 0;
    int         offset = 0;

    server_cmd_type = tvb_get_uint8(tvb, offset);

    cmd_type_item = proto_tree_add_uint(tree,
            hf_quake2_game_server_command, tvb, offset, 1, server_cmd_type);

    proto_item_append_text(cmd_type_item, " (%s)",
            val_to_str(server_cmd_type, names_server_cmd, "%u"));

    offset++;
    rest_length = tvb_reported_length(tvb) - offset;
    if (rest_length)
        next_tvb = tvb_new_subset_remaining(tvb, offset);
    else
        return;


    switch (server_cmd_type) {
        case SVC_BAD:
            break;
        case SVC_MUZZLEFLASH:
            break;
        case SVC_MUZZLEFLASH2:
            break;
        case SVC_TEMP_ENTITY:
            break;
        case SVC_LAYOUT:
            break;
        case SVC_NOP:
            break;
        case SVC_DISCONNECT:
            break;
        case SVC_RECONNECT:
            break;
        case SVC_SOUND:
            break;
        case SVC_PRINT:
            break;
        case SVC_STUFFTEXT:
            break;
        case SVC_SERVERDATA:
            break;
        case SVC_CONFIGSTRING:
            break;
        case SVC_SPAWNBASELINE:
            break;
        case SVC_CENTERPRINT:
            break;
        case SVC_DOWNLOAD:
            break;
        case SVC_PLAYERINFO:
            break;
        case SVC_PACKETENTITIES:
            break;
        case SVC_DELTAPACKETENTITIES:
            break;
        case SVC_FRAME:
            break;

        default:
            break;
    }
    call_data_dissector(next_tvb, 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_quake2_GamePacket(tvbuff_t *tvb, packet_info *pinfo,
        proto_tree *tree, int direction)
{
    proto_tree *game_tree;
    uint32_t   seq1;
    uint32_t   seq2;
    int        rel1;
    int        rel2;
    int        offset;
    unsigned   rest_length;

    direction = value_is_in_range(gbl_quake2ServerPorts, pinfo->destport) ?
        DIR_C2S : DIR_S2C;

    game_tree = proto_tree_add_subtree(tree, tvb,
            0, -1, ett_quake2_game, NULL, "Game");

    offset = 0;

    seq1 = tvb_get_letohl(tvb, offset);
    rel1 = seq1 & 0x80000000 ? 1 : 0;
    seq1 &= ~0x80000000;
    if (game_tree) {
        proto_tree *seq1_tree = proto_tree_add_subtree_format(game_tree,
                tvb, offset, 4, ett_quake2_game_seq1, NULL, "Current Sequence: %u (%s)",
                seq1, val_to_str(rel1,names_reliable,"%u"));
        proto_tree_add_uint(seq1_tree, hf_quake2_game_seq1,
                tvb, offset, 4, seq1);
        proto_tree_add_boolean(seq1_tree, hf_quake2_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_tree *seq2_tree = proto_tree_add_subtree_format(game_tree,
                tvb, offset, 4, ett_quake2_game_seq2, NULL, "Acknowledge Sequence: %u (%s)",
                seq2, val_to_str(rel2,names_reliable,"%u"));
        proto_tree_add_uint(seq2_tree, hf_quake2_game_seq2,
                tvb, offset, 4, seq2);
        proto_tree_add_boolean(seq2_tree, hf_quake2_game_rel2,
                tvb, offset+3, 1, rel2);
    }
    offset += 4;

    if (direction == DIR_C2S) {
        /* client to server */
        uint16_t qport = tvb_get_letohs(tvb, offset);
        if (game_tree) {
            proto_tree_add_uint(game_tree, hf_quake2_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_remaining(tvb, offset);
        proto_tree *c_tree;

        if (direction == DIR_C2S) {
            c_tree = proto_tree_add_subtree(game_tree, next_tvb,
                        0, -1, ett_quake2_game_clc, NULL, "Client Commands");
            dissect_quake2_client_commands(next_tvb, pinfo, c_tree);
        }
        else {
            c_tree = proto_tree_add_subtree(game_tree, next_tvb,
                        0, -1, ett_quake2_game_svc, NULL, "Server Commands");
            dissect_quake2_server_commands(next_tvb, pinfo, c_tree);
        }
    }
}


static int
dissect_quake2(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, void* data _U_)
{
    proto_tree *quake2_tree = NULL;
    int  direction;

    direction = value_is_in_range(gbl_quake2ServerPorts, pinfo->destport) ?
        DIR_C2S : DIR_S2C;

    col_set_str(pinfo->cinfo, COL_PROTOCOL, "QUAKE2");
    col_add_str(pinfo->cinfo, COL_INFO, val_to_str(direction,
                names_direction, "%u"));

    if (tree) {
        proto_item *quake2_item;
        quake2_item = proto_tree_add_item(tree, proto_quake2,
                tvb, 0, -1, ENC_NA);
        quake2_tree = proto_item_add_subtree(quake2_item, ett_quake2);
        proto_tree_add_uint_format(quake2_tree,
                direction == DIR_S2C ?
                hf_quake2_s2c :
                hf_quake2_c2s,
                tvb, 0, 0, 1,
                "Direction: %s", val_to_str(direction, names_direction, "%u"));
    }

    if (tvb_get_ntohl(tvb, 0) == 0xffffffff) {
        col_append_str(pinfo->cinfo, COL_INFO, " Connectionless");
        proto_tree_add_uint_format(quake2_tree,
                hf_quake2_connectionless,
                tvb, 0, 0, 1,
                "Type: Connectionless");
        dissect_quake2_ConnectionlessPacket(
                tvb, pinfo, quake2_tree, direction);
    }
    else {
        col_append_str(pinfo->cinfo, COL_INFO, " Game");
        proto_tree_add_uint_format(quake2_tree,
                hf_quake2_game,
                tvb, 0, 0, 1,
                "Type: Game");
        dissect_quake2_GamePacket(
                tvb, pinfo, quake2_tree, direction);
    }
    return tvb_captured_length(tvb);
}

static void
apply_quake2_prefs(void)
{
    /* Port preference used to determine client/server */
    gbl_quake2ServerPorts = prefs_get_range_value("quake2", "udp.port");
}

void
proto_register_quake2(void)
{
    static hf_register_info hf[] = {
        { &hf_quake2_c2s,
            { "Client to Server", "quake2.c2s",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_s2c,
            { "Server to Client", "quake2.s2c",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_connectionless,
            { "Connectionless", "quake2.connectionless",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_game,
            { "Game", "quake2.game",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_userinfo,
            { "Userinfo", "quake2.userinfo",
                FT_STRING, BASE_NONE, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_command,
            { "Command", "quake2.command",
                FT_STRING, BASE_NONE, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_connectionless_marker,
            { "Marker", "quake2.connectionless.marker",
                FT_UINT32, BASE_HEX, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_connectionless_text,
            { "Text", "quake2.connectionless.text",
                FT_STRING, BASE_NONE, NULL, 0x0,
                NULL, HFILL }},
        { &hf_quake2_game_seq1,
            { "Sequence Number", "quake2.game.seq1",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                "Sequence number of the current packet", HFILL }},
        { &hf_quake2_game_rel1,
            { "Reliable", "quake2.game.rel1",
                FT_BOOLEAN, BASE_NONE, NULL, 0x0,
                "Packet is reliable and may be retransmitted", HFILL }},
        { &hf_quake2_game_seq2,
            { "Sequence Number", "quake2.game.seq2",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                "Sequence number of the last received packet", HFILL }},
        { &hf_quake2_game_rel2,
            { "Reliable", "quake2.game.rel2",
                FT_BOOLEAN, BASE_NONE, NULL, 0x0,
                "Packet was reliable and may be retransmitted", HFILL }},
        { &hf_quake2_game_qport,
            { "QPort", "quake2.game.qport",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                "Quake II Client Port", HFILL }},
        { &hf_quake2_game_client_command,
            { "Client Command Type", "quake2.game.client.command",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "Quake II Client Command", HFILL }},
        { &hf_quake2_game_server_command,
            { "Server Command", "quake2.game.server.command",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "Quake II Server Command", HFILL }},
        { &hf_quake2_game_client_command_move_chksum,
            { "Checksum", "quake2.game.client.command.move.chksum",
                FT_UINT8, BASE_HEX, NULL, 0x0,
                "Quake II Client Command Move", HFILL }},
        { &hf_quake2_game_client_command_move_lframe,
            { "Last Frame", "quake2.game.client.command.move.lframe",
                FT_UINT32, BASE_DEC, NULL, 0x0,
                "Quake II Client Command Move", HFILL }},
        { &hf_quake2_game_client_command_move,
            { "Bitfield", "quake2.game.client.command.move",
                FT_UINT8, BASE_HEX, NULL, 0x0,
                "Quake II Client Command Move", HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_angles1,
            { "Angles (pitch)", "quake2.game.client.command.move.angles",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_ANGLE1, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_angles2,
            { "Angles (yaw)", "quake2.game.client.command.move.angles",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_ANGLE2, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_angles3,
            { "Angles (roll)", "quake2.game.client.command.move.angles",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_ANGLE3, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_movement_fwd,
            { "Movement (fwd)", "quake2.game.client.command.move.movement",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_FORWARD, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_movement_side,
            { "Movement (side)", "quake2.game.client.command.move.movement",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_SIDE, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_movement_up,
            { "Movement (up)", "quake2.game.client.command.move.movement",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_UP, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_buttons,
            { "Buttons", "quake2.game.client.command.move.buttons",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_BUTTONS, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_bitfield_impulse,
            { "Impulse", "quake2.game.client.command.move.impulse",
                FT_UINT8, BASE_HEX,
                VALS(hf_quake2_game_client_command_move_vals),
                CM_IMPULSE, NULL, HFILL }},
        { &hf_quake2_game_client_command_move_msec,
            { "Msec", "quake2.game.client.command.move.msec",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "Quake II Client Command Move", HFILL }},
        { &hf_quake2_game_client_command_move_lightlevel,
            { "Lightlevel", "quake2.game.client.command.move.lightlevel",
                FT_UINT8, BASE_DEC, NULL, 0x0,
                "Quake II Client Command Move", HFILL }}
    };
    static int *ett[] = {
        &ett_quake2,
        &ett_quake2_connectionless,
        &ett_quake2_game,
        &ett_quake2_game_seq1,
        &ett_quake2_game_seq2,
        &ett_quake2_game_clc,
        &ett_quake2_game_svc,
        &ett_quake2_game_clc_cmd,
        &ett_quake2_game_svc_cmd,
        &ett_quake2_game_clc_cmd_move_moves,
        &ett_quake2_game_clc_cmd_move_bitfield
    };

    proto_quake2 = proto_register_protocol("Quake II Network Protocol", "QUAKE2", "quake2");
    proto_register_field_array(proto_quake2, hf, array_length(hf));
    proto_register_subtree_array(ett, array_length(ett));

    /* Register the dissector handle */
    quake2_handle = register_dissector("quake2", dissect_quake2, proto_quake2);

    /* Register a configuration option for port */
    prefs_register_protocol(proto_quake2, apply_quake2_prefs);
}

void
proto_reg_handoff_quake2(void)
{
    dissector_add_uint_with_preference("udp.port", PORT_MASTER, quake2_handle);
    apply_quake2_prefs();
}

/*
 * 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:
 */