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packet-minecraft.c
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/*
Copyright (C) 2011 by Scott Brooks
Copyright (C) 2011 by Alan De Smet
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#if 1
/* Include only as needed */
#include <stdio.h>
/* #include <stdlib.h> */
/* #include <string.h> */
#endif
#include <glib.h>
#include <gmodule.h>
#include <epan/prefs.h>
#include <epan/packet.h>
#include <epan/emem.h>
#include <epan/dissectors/packet-tcp.h>
/* forward reference */
void proto_register_minecraft();
void proto_reg_handoff_minecraft();
int dissect_minecraft(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree);
/* Define version if we are not building Wireshark statically */
#ifndef ENABLE_STATIC
G_MODULE_EXPORT const gchar version[] = "0.0";
#endif
#define PROTO_TAG_MC "MC"
#define MC_MAX_UCS2LEN 1024
#define MC_TYPELEN_BYTE 1
#define MC_TYPELEN_SHORT 2
#define MC_TYPELEN_INT 4
#define MC_TYPELEN_LONG 8
#define MC_TYPELEN_FLOAT 4
#define MC_TYPELEN_DOUBLE 8
#define MC_TYPELEN_UTF8LEN 2
#define MC_TYPELEN_UCS2LEN 2
#define MC_TYPELEN_BOOL 1
#define MC_TYPELEN_PDUTYPE 1
static int proto_minecraft = -1;
static dissector_handle_t minecraft_handle;
static GIConv ucs2_iconv= (GIConv)-1;
proto_item *mc_item = NULL;
proto_item *mc_sub_item = NULL;
proto_tree *mc_tree = NULL;
proto_tree *mc_header_tree = NULL;
#include "packet-minecraft-names.h"
#include "packet-minecraft-values.h"
#ifndef ENABLE_STATIC
G_MODULE_EXPORT void plugin_register(void)
{
/* register the new protocol, protocol fields, and subtrees */
if (proto_minecraft == -1) { /* execute protocol initialization only once */
proto_register_minecraft();
}
}
G_MODULE_EXPORT void plugin_reg_handoff(void) {
proto_reg_handoff_minecraft();
}
#endif
static gint ett_mc = -1;
static gint ett_mc_double_coords = -1;
static gint ett_mc_int_coords = -1;
/* Setup protocol subtree array */
static gint *ett[] = {
&ett_mc,
&ett_mc_double_coords,
&ett_mc_int_coords
};
#include "packet-minecraft-hfint.h"
#include "packet-minecraft-register.h"
#define PROTO_TREE_ADD(tree, hf, tvb, offset, type_len) proto_tree_add_item(tree, hf, tvb, offset, type_len, FALSE); \
offset += type_len;
void proto_reg_handoff_minecraft(void)
{
static int Initialized=FALSE;
/* register with wireshark to dissect udp packets on port 25565 */
if (!Initialized) {
minecraft_handle = new_create_dissector_handle(dissect_minecraft, proto_minecraft);
dissector_add("tcp.port", 25565, minecraft_handle);
ucs2_iconv = g_iconv_open( "UTF-8//TRANSLIT", "UCS-2BE" );
Initialized = TRUE;
}
}
static guint metadata_len(tvbuff_t * tvb, guint offset, guint available)
{
guint len;
len = 0;
while(1) {
guint8 x;
if( (offset+len+1) > available ) { return -1; }
len += 1;
x = tvb_get_guint8(tvb, offset + len - 1);
if(x == 127) { return len; }
switch(x >> 5) {
case 0: len += 1; break; /* int8 */
case 1: len += 2; break; /* int16 */
case 2: len += 4; break; /* int32 */
case 3: len += 4; break; /* float32 */
case 4: /* string */
if( (offset+len+2) > available ) { return -1; }
len += 2 + tvb_get_ntohs(tvb, offset+len);
break;
case 5: len += 5; break; /* int16, int8, int16 */
default: len += 4; break; /* TODO: Eeeee! */
}
}
DISSECTOR_ASSERT(0); /* Loop should never exit */
}
static gint32 tvb_get_ntohint(tvbuff_t * tvb, guint offset, guint size)
{
switch(size) {
case 1: return (gint32)tvb_get_guint8(tvb, offset);
case 2: return (gint32)tvb_get_ntohs(tvb, offset);
case 3: return (gint32)tvb_get_ntoh24(tvb, offset);
case 4: return (gint32)tvb_get_ntohl(tvb, offset);
/*case 5: return (gint32)tvb_get_ntoh40(tvb, offset); */
/*case 6: return (gint32)tvb_get_ntoh48(tvb, offset); */
/*case 7: return (gint32)tvb_get_ntoh56(tvb, offset); */
case 8: return (gint32)tvb_get_ntoh64(tvb, offset);
default: break;
}
DISSECTOR_ASSERT(FALSE);
return 0;
}
static void proto_tree_add_item_varint(proto_tree *tree, gint hf_id_byte, gint hf_id_quad, tvbuff_t * tvb, guint32 offset, guint32 size)
{
if(size == 1) {
proto_tree_add_item(tree, hf_id_byte, tvb, offset, 1, FALSE);
} else {
proto_tree_add_item(tree, hf_id_quad, tvb, offset, 4, FALSE);
}
}
static void proto_tree_add_item_ucs2string (proto_tree *tree, int hfindex, tvbuff_t *tvb, gint start )
{
guint16 ucs2_len;
gboolean dump_bytes = FALSE;
ucs2_len = tvb_get_ntohs( tvb, start );
if ( ucs2_iconv != (GIConv)-1 && ucs2_len <= MC_MAX_UCS2LEN )
{
gchar *in, *out, *out_const;
gsize in_len, out_len, rv_iconv;
in_len = ucs2_len * 2;
in = (gchar*)tvb_get_ptr(tvb, start + MC_TYPELEN_UCS2LEN, in_len);
if ( in )
{
out_len = ucs2_len*2;
out_const = ep_alloc0( (size_t)out_len + 1);
out = out_const;
}
if ( in != NULL && out != NULL )
{
rv_iconv = g_iconv( ucs2_iconv, &in, &in_len, &out, &out_len );
if ( -1 != rv_iconv )
{
proto_tree_add_bytes_format_value( tree, hfindex, tvb, start, ucs2_len*2 + MC_TYPELEN_UCS2LEN,
tvb_get_ptr( tvb, start, ucs2_len*2 + MC_TYPELEN_UCS2LEN),
"%s", out_const );
}
else
{
g_iconv( ucs2_iconv, NULL, 0, NULL, 0 );
dump_bytes = TRUE;
}
}
else
{
dump_bytes = TRUE;
}
}
else
{
dump_bytes = TRUE;
}
if ( dump_bytes )
{
proto_tree_add_item(tree, hfindex, tvb, start, MC_TYPELEN_UCS2LEN + ucs2_len * 2, FALSE);
}
}
static void add_int_coordinates( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset, guint32 xoffset, guint x_size, guint32 yoffset, guint y_size, guint32 zoffset, guint z_size)
{
proto_item *ti;
proto_tree * coord_tree;
gint32 x,y,z;
x = tvb_get_ntohint(tvb, offset+xoffset, x_size);
y = tvb_get_ntohint(tvb, offset+yoffset, y_size);
z = tvb_get_ntohint(tvb, offset+zoffset, z_size);
ti = proto_tree_add_none_format(tree, hf_mc_int_coords, tvb, offset + xoffset, x_size + y_size + z_size,
"Coordinates: %d, %d, %d", (gint32)tvb_get_ntohl(tvb, offset+xoffset), y, (gint32)tvb_get_ntohl(tvb, offset+zoffset));
coord_tree = proto_item_add_subtree(ti, ett_mc_int_coords);
proto_tree_add_item_varint(coord_tree, hf_mc_xbyte, hf_mc_xint, tvb, offset+xoffset, 4);
proto_tree_add_item_varint(coord_tree, hf_mc_ybyte, hf_mc_yint, tvb, offset+yoffset, 4);
proto_tree_add_item_varint(coord_tree, hf_mc_zbyte, hf_mc_zint, tvb, offset+zoffset, 4);
}
static void add_double_coordinates( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset, guint32 xoffset, guint32 yoffset, guint32 zoffset)
{
proto_item *ti;
proto_tree * coord_tree;
ti = proto_tree_add_none_format(tree, hf_mc_double_coords, tvb, offset, -1, "Coordinates: %f, %f, %f", tvb_get_ntohieee_double(tvb, offset+xoffset), tvb_get_ntohieee_double(tvb, offset+yoffset), tvb_get_ntohieee_double(tvb, offset+zoffset));
coord_tree = proto_item_add_subtree(ti, ett_mc_double_coords);
proto_tree_add_item(coord_tree, hf_mc_x, tvb, offset + xoffset, 8, FALSE);
proto_tree_add_item(coord_tree, hf_mc_y, tvb, offset + yoffset, 8, FALSE);
proto_tree_add_item(coord_tree, hf_mc_z, tvb, offset + zoffset, 8, FALSE);
}
static void add_login_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset, gboolean c2s)
{
guint16 ucs2_len;
offset += MC_TYPELEN_PDUTYPE;
proto_tree_add_item(tree, c2s?hf_mc_login_protocol_version:hf_mc_entity_id, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
ucs2_len = tvb_get_ntohs( tvb, offset );
proto_tree_add_item_ucs2string( tree, c2s?hf_mc_login_username:hf_mc_server_name, tvb, offset );
offset += MC_TYPELEN_UCS2LEN + ucs2_len * 2;
proto_tree_add_item(tree, hf_mc_login_map_seed, tvb, offset, MC_TYPELEN_LONG, FALSE);
offset += MC_TYPELEN_LONG;
proto_tree_add_item(tree, hf_mc_server_mode, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_dimension, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_difficulty, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_world_height, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_max_players, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
}
static void add_handshake_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset, gboolean c2s)
{
gint hf = c2s ? hf_mc_username : hf_mc_serverid;
proto_tree_add_item_ucs2string(tree, hf, tvb, offset + MC_TYPELEN_PDUTYPE);
}
static void add_chat_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item_ucs2string(tree, hf_mc_chat, tvb, offset + MC_TYPELEN_PDUTYPE);
}
static void add_time_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
guint64 time;
time = tvb_get_ntoh64(tvb, offset + 1 );
proto_tree_add_item(tree, hf_mc_time, tvb, offset + 1, 8, FALSE);
}
static void add_update_health_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
offset += MC_TYPELEN_PDUTYPE;
PROTO_TREE_ADD(tree, hf_mc_health, tvb, offset, MC_TYPELEN_SHORT);
PROTO_TREE_ADD(tree, hf_mc_food, tvb, offset, MC_TYPELEN_SHORT);
PROTO_TREE_ADD(tree, hf_mc_food_saturation, tvb, offset, MC_TYPELEN_FLOAT);
}
static void add_loaded_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_loaded, tvb, offset + 1, 1, FALSE);
}
static void add_player_position_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
add_double_coordinates(tree, tvb, pinfo, offset, 1, 9, 25);
proto_tree_add_item(tree, hf_mc_stance, tvb, offset + 17, 8, FALSE);
}
static void add_player_look_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_rotation, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_pitch, tvb, offset + 5, 4, FALSE);
}
static void add_player_move_look_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
add_double_coordinates(tree, tvb, pinfo, offset, 1, 9, 25);
proto_tree_add_item(tree, hf_mc_stance, tvb, offset + 17, 8, FALSE);
proto_tree_add_item(tree, hf_mc_rotation, tvb, offset + 33, 4, FALSE);
proto_tree_add_item(tree, hf_mc_pitch, tvb, offset + 37, 4, FALSE);
}
static void add_block_dig_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_status, tvb, offset + 1, 1, FALSE);
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 2, 4, FALSE);
proto_tree_add_item(tree, hf_mc_ybyte, tvb, offset + 6, 1, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 7, 4, FALSE);
proto_tree_add_item(tree, hf_mc_direction, tvb, offset + 11, 1, FALSE);
}
static void add_place_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
add_int_coordinates(tree, tvb, pinfo, offset, 1, 4, 5, 1, 6, 4);
proto_tree_add_item(tree, hf_mc_direction, tvb, offset + 10, 1, FALSE);
proto_tree_add_item(tree, hf_mc_block_type, tvb, offset + 1, 2, FALSE);
/* TODO: if block_type >= 0, then more fields */
}
/* TODO DEAD?
static void add_block_item_switch_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_item_code, tvb, offset + 5, 2, FALSE);
}
*/
static void add_change_slot_selection( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset, gboolean c2s)
{
proto_tree_add_item(tree, hf_mc_inventory_slot, tvb, offset + 1, 2, FALSE);
}
/*** currently unused ***
static void add_add_to_inventory_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_block_type, tvb, offset + 1, 2, FALSE);
proto_tree_add_item(tree, hf_mc_amount, tvb, offset + 3, 1, FALSE);
proto_tree_add_item(tree, hf_mc_life, tvb, offset + 4, 2, FALSE);
}
*/
static void add_animation_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_entity_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_animation, tvb, offset + 5, 1, FALSE);
}
static void add_named_entity_spawn_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
offset += MC_TYPELEN_PDUTYPE;
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item_ucs2string(tree, hf_mc_username, tvb, offset);
offset += MC_TYPELEN_UCS2LEN + tvb_get_ntohs( tvb, offset ) * 2;
proto_tree_add_item(tree, hf_mc_xint, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_yint, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_zint, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_rotation_byte, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_pitch_byte, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_item_code, tvb, offset, MC_TYPELEN_SHORT, FALSE);
offset += MC_TYPELEN_SHORT;
}
static void add_pickup_spawn_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_block_type, tvb, offset + 5, 2, FALSE);
proto_tree_add_item(tree, hf_mc_count, tvb, offset + 7, 1, FALSE);
proto_tree_add_item(tree, hf_mc_damage, tvb, offset + 8, 1, FALSE);
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 10, 4, FALSE);
proto_tree_add_item(tree, hf_mc_yint, tvb, offset + 14, 4, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 18, 4, FALSE);
proto_tree_add_item(tree, hf_mc_rotation_byte, tvb, offset + 22, 1, FALSE);
proto_tree_add_item(tree, hf_mc_pitch_byte, tvb, offset + 23, 1, FALSE);
proto_tree_add_item(tree, hf_mc_roll_byte, tvb, offset + 24, 1, FALSE);
}
static void add_entity_status_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
offset += MC_TYPELEN_PDUTYPE;
proto_tree_add_item(tree, hf_mc_entity_id, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_entity_status, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
}
static void add_pre_chunk_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 5, 4, FALSE);
proto_tree_add_item(tree, hf_mc_ybyte, tvb, offset + 9, 1, FALSE); /* TODO: This is actually mode, not Y */
}
static void add_map_chunk_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_yshort, tvb, offset + 5, 2, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 7, 4, FALSE);
proto_tree_add_item(tree, hf_mc_size_x, tvb, offset + 11, 1, FALSE);
proto_tree_add_item(tree, hf_mc_size_y, tvb, offset + 12, 1, FALSE);
proto_tree_add_item(tree, hf_mc_size_z, tvb, offset + 13, 1, FALSE);
}
static void add_block_change_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_ybyte, tvb, offset + 5, 1, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 6, 4, FALSE);
proto_tree_add_item(tree, hf_mc_block_type_byte, tvb, offset + 10, 1, FALSE);
proto_tree_add_item(tree, hf_mc_block_meta_byte, tvb, offset + 11, 1, FALSE);
}
static void add_spawn_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
add_int_coordinates(tree, tvb, pinfo, offset, 1, 4, 5, 4, 9, 4);
}
static void add_respawn_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_dimension, tvb, offset + MC_TYPELEN_PDUTYPE, MC_TYPELEN_BYTE, FALSE);
}
static void add_complex_entity_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_yshort, tvb, offset + 5, 2, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 7, 4, FALSE);
}
static void add_collect_item_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_xbyte, tvb, offset + 5, 1, FALSE);
proto_tree_add_item(tree, hf_mc_ybyte, tvb, offset + 6, 1, FALSE);
proto_tree_add_item(tree, hf_mc_zbyte, tvb, offset + 7, 1, FALSE);
}
static void add_object_vehicle_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_type, tvb, offset + 5, 1, FALSE);
proto_tree_add_item(tree, hf_mc_xint, tvb, offset + 6, 4, FALSE);
proto_tree_add_item(tree, hf_mc_yint, tvb, offset + 10, 4, FALSE);
proto_tree_add_item(tree, hf_mc_zint, tvb, offset + 14, 4, FALSE);
}
static void add_mobspawn_details ( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
offset += MC_TYPELEN_PDUTYPE;
proto_tree_add_item(tree, hf_mc_entity_id, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_mob_type, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_xint, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_yint, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_zint, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_rotation_byte, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_pitch_byte, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
}
static void add_destroy_entity_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
}
static void add_relative_entity_move_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_xbyte, tvb, offset + 5, 1, FALSE);
proto_tree_add_item(tree, hf_mc_ybyte, tvb, offset + 6, 1, FALSE);
proto_tree_add_item(tree, hf_mc_zbyte, tvb, offset + 7, 1, FALSE);
}
static void add_entity_look_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_rotation_byte, tvb, offset + 5, 1, FALSE);
proto_tree_add_item(tree, hf_mc_pitch_byte, tvb, offset + 6, 1, FALSE);
}
static void add_relative_entity_move_look_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item(tree, hf_mc_unique_id, tvb, offset + 1, 4, FALSE);
proto_tree_add_item(tree, hf_mc_xbyte, tvb, offset + 5, 1, FALSE);
proto_tree_add_item(tree, hf_mc_ybyte, tvb, offset + 6, 1, FALSE);
proto_tree_add_item(tree, hf_mc_zbyte, tvb, offset + 7, 1, FALSE);
proto_tree_add_item(tree, hf_mc_rotation_byte, tvb, offset + 8, 1, FALSE);
proto_tree_add_item(tree, hf_mc_pitch_byte, tvb, offset + 9, 1, FALSE);
}
static void add_update_sign_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
offset += MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_SHORT + MC_TYPELEN_INT;
proto_tree_add_item_ucs2string(tree, hf_mc_sign_line1, tvb, offset );
offset += MC_TYPELEN_UCS2LEN + tvb_get_ntohs( tvb, offset ) * 2;
proto_tree_add_item_ucs2string(tree, hf_mc_sign_line2, tvb, offset );
offset += MC_TYPELEN_UCS2LEN + tvb_get_ntohs( tvb, offset ) * 2;
proto_tree_add_item_ucs2string(tree, hf_mc_sign_line3, tvb, offset );
offset += MC_TYPELEN_UCS2LEN + tvb_get_ntohs( tvb, offset ) * 2;
proto_tree_add_item_ucs2string(tree, hf_mc_sign_line4, tvb, offset );
offset += MC_TYPELEN_UCS2LEN + tvb_get_ntohs( tvb, offset ) * 2;
}
static void add_increment_statistic_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
offset += MC_TYPELEN_PDUTYPE;
proto_tree_add_item(tree, hf_mc_statistics_id, tvb, offset, MC_TYPELEN_INT, FALSE);
offset += MC_TYPELEN_INT;
proto_tree_add_item(tree, hf_mc_statistics_increment, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
}
static void add_kick_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
proto_tree_add_item_ucs2string(tree, hf_mc_kick, tvb, offset + 1);
}
static void add_player_list_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset)
{
guint16 ucs2_len;
offset += MC_TYPELEN_PDUTYPE;
ucs2_len = tvb_get_ntohs( tvb, offset );
proto_tree_add_item_ucs2string( tree, hf_mc_login_username, tvb, offset );
offset += MC_TYPELEN_UCS2LEN + ucs2_len * 2;
proto_tree_add_item(tree, hf_mc_online, tvb, offset, MC_TYPELEN_BYTE, FALSE);
offset += MC_TYPELEN_BYTE;
proto_tree_add_item(tree, hf_mc_ping, tvb, offset, MC_TYPELEN_SHORT, FALSE);
offset += MC_TYPELEN_BYTE;
}
static void add_creative_inventory_action_details( proto_tree *tree, tvbuff_t *tvb, packet_info *pinfo, guint32 offset )
{
offset += MC_TYPELEN_PDUTYPE;
PROTO_TREE_ADD(tree, hf_mc_inventory_slot, tvb, offset, MC_TYPELEN_SHORT);
PROTO_TREE_ADD(tree, hf_mc_item_code, tvb, offset, MC_TYPELEN_SHORT);
PROTO_TREE_ADD(tree, hf_mc_quantity, tvb, offset, MC_TYPELEN_SHORT);
PROTO_TREE_ADD(tree, hf_mc_damage, tvb, offset, MC_TYPELEN_SHORT);
}
static void dissect_minecraft_message(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree, guint8 type, guint32 offset, guint32 length)
{
gboolean c2s;
if (check_col(pinfo->cinfo, COL_PROTOCOL))
col_set_str(pinfo->cinfo, COL_PROTOCOL, PROTO_TAG_MC);
/* Clear out stuff in the info column */
// if(check_col(pinfo->cinfo,COL_INFO)){
// col_clear(pinfo->cinfo,COL_INFO);
// }
c2s = pinfo->match_port == pinfo->destport;
if (check_col(pinfo->cinfo, COL_INFO)) {
col_add_fstr(pinfo->cinfo, COL_INFO, "%s: %s",
c2s ? "C -> S" : "S -> C",
val_to_str(type, packettypenames, "Unknown Type:0x%02x")
);
}
if ( tree ) {
mc_item = proto_tree_add_protocol_format(tree, proto_minecraft, tvb, offset, length,
"MC Packet: 0x%02x \"%s\"", type, val_to_str(type, packettypenames, "Unknown"));
mc_tree = proto_item_add_subtree(mc_item, ett_mc);
proto_tree_add_item(mc_tree, hf_mc_type, tvb, offset, 1, FALSE);
proto_tree_add_text(mc_tree, tvb, offset, length, "Direction: %s", c2s?"Client -> Server":"Server -> Client");
proto_tree_add_item(mc_tree, hf_mc_data, tvb, offset, length, FALSE);
switch (type) {
case 0x01:
add_login_details(mc_tree, tvb, pinfo, offset, c2s);
break;
case 0x02:
add_handshake_details(mc_tree, tvb, pinfo, offset, c2s);
break;
case 0x03:
add_chat_details(mc_tree, tvb, pinfo, offset);
break;
case 0x04:
add_time_details(mc_tree, tvb, pinfo, offset);
break;
case 0x06:
add_spawn_details(mc_tree, tvb, pinfo, offset);
break;
case 0x08:
add_update_health_details(mc_tree, tvb, pinfo, offset);
break;
case 0x09:
add_respawn_details(mc_tree, tvb, pinfo, offset);
break;
case 0x0A:
add_loaded_details(mc_tree, tvb, pinfo, offset);
break;
case 0x0B:
add_player_position_details(mc_tree, tvb, pinfo, offset);
break;
case 0x0C:
add_player_look_details(mc_tree, tvb, pinfo, offset);
break;
case 0x0D:
add_player_move_look_details(mc_tree, tvb, pinfo, offset);
break;
case 0x0E:
add_block_dig_details(mc_tree, tvb, pinfo, offset);
break;
case 0x0F:
add_place_details(mc_tree, tvb, pinfo, offset);
break;
case 0x10:
add_change_slot_selection(mc_tree, tvb, pinfo, offset, c2s);
break;
case 0x12:
add_animation_details(mc_tree, tvb, pinfo, offset);
break;
case 0x14:
add_named_entity_spawn_details(mc_tree, tvb, pinfo, offset);
break;
case 0x15:
add_pickup_spawn_details(mc_tree, tvb, pinfo, offset);
break;
case 0x16:
add_collect_item_details(mc_tree, tvb, pinfo, offset);
break;
case 0x17:
add_object_vehicle_details(mc_tree, tvb, pinfo, offset);
break;
case 0x18:
add_mobspawn_details(mc_tree, tvb, pinfo, offset);
break;
case 0x1D:
add_destroy_entity_details(mc_tree, tvb, pinfo, offset);
break;
case 0x1F:
add_relative_entity_move_details(mc_tree, tvb, pinfo, offset);
break;
case 0x20:
add_entity_look_details(mc_tree, tvb, pinfo, offset);
break;
case 0x21:
add_relative_entity_move_look_details(mc_tree, tvb, pinfo, offset);
break;
case 0x26:
add_entity_status_details(mc_tree, tvb, pinfo, offset);
break;
/* ... */
case 0x32:
add_pre_chunk_details(mc_tree, tvb, pinfo, offset);
break;
case 0x33:
add_map_chunk_details(mc_tree, tvb, pinfo, offset);
break;
case 0x35:
add_block_change_details(mc_tree, tvb, pinfo, offset);
break;
case 0x6B:
add_creative_inventory_action_details(mc_tree, tvb, pinfo, offset);
break;
case 0x3b:
add_complex_entity_details(mc_tree, tvb, pinfo, offset);
break;
case 0x82:
add_update_sign_details(mc_tree, tvb, pinfo, offset);
break;
case 0xc8:
add_increment_statistic_details(mc_tree, tvb, pinfo, offset);
break;
case 0xc9:
add_player_list_details(mc_tree, tvb, pinfo, offset);
break;
case 0xff:
add_kick_details(mc_tree, tvb, pinfo, offset);
break;
}
}
}
guint get_minecraft_message_len(guint8 type,guint offset, guint available, tvbuff_t *tvb)
{
guint len = -1;
guint rel_offset = 0;
switch (type) {
case 0x00: return 5;
case 0x01:
if ( available >= MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_UCS2LEN )
{
len = tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT) * 2;
len += MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_UCS2LEN + +
MC_TYPELEN_LONG + MC_TYPELEN_INT + MC_TYPELEN_BYTE + MC_TYPELEN_BYTE
+ MC_TYPELEN_BYTE + MC_TYPELEN_BYTE;
}
break;
case 0x02:
if ( available >= MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN )
{
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN +
tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE) * 2;
}
break;
case 0x03:
if ( available >= MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN )
{
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN +
tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE) * 2;
}
break;
case 0x04: return 9;
case 0x05: return 11;
case 0x06: return 13;
case 0x07: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_INT + MC_TYPELEN_BOOL;
case 0x08: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_SHORT + MC_TYPELEN_SHORT + MC_TYPELEN_FLOAT;
case 0x09: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_BYTE;
case 0x0A: return 2;
case 0x0B: return 34;
case 0x0C: return 10;
case 0x0D: return 42;
case 0x0E: return 12;
case 0x0F:
if(available < 13) { return -1; }
if(((gint16)tvb_get_ntohs(tvb, offset+11)) < 0) { return 13; }
return 16;
case 0x10: return 3;
case 0x11: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_BYTE + MC_TYPELEN_INT + MC_TYPELEN_BYTE + MC_TYPELEN_INT;
case 0x12: return 6;
case 0x13: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_BYTE;
case 0x14:
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT +
MC_TYPELEN_UCS2LEN + tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT) * 2 +
MC_TYPELEN_INT * 3 +
MC_TYPELEN_BYTE + MC_TYPELEN_BYTE + MC_TYPELEN_SHORT;
break;
case 0x15: return 25;
case 0x16: return 9;
case 0x17: return 18;
case 0x18:
rel_offset = MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_BYTE + MC_TYPELEN_INT * 3 + MC_TYPELEN_BYTE * 2;
if ( available > rel_offset )
{
len = metadata_len(tvb, offset + rel_offset, available);
if ( len != -1 )
len += rel_offset;
}
break;
case 0x19:
if ( available >= MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_UCS2LEN )
{
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_UCS2LEN +
tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_UCS2LEN) * 2 +
MC_TYPELEN_INT * 4;
}
break;
case 0x1B: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_FLOAT * 2 + MC_TYPELEN_BOOL * 2 + MC_TYPELEN_FLOAT * 2;
case 0x1C: return 11;
case 0x1D: return 5;
case 0x1E: return 5;
case 0x1F: return 8;
case 0x20: return 7;
case 0x21: return 10;
case 0x22: return 19;
case 0x26: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_BYTE;
case 0x27: return 9;
case 0x28:
if ( available > MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT )
{
len = metadata_len(tvb, offset + MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT, available);
if ( len != -1 )
len += MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT;
}
break;
case 0x2B: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_BYTE + MC_TYPELEN_BYTE + MC_TYPELEN_SHORT;
case 0x32: return 10;
case 0x33:
if ( available >= 18 ) {
len = 18 + tvb_get_ntohl(tvb, offset + 14);
}
break;
case 0x34:
if ( available >= 11 ) {
// the size we get here is number of elements in the arrays
// and there are 3 arrays, a short, and two bytes, so multiply by 4
len = 11 + (4 * tvb_get_ntohs(tvb, offset + 9));
}
break;
case 0x35: return 12;
case 0x36: return 13;
case 0x3b:
if ( available >= 13 ) {
len = 13 + tvb_get_ntohs(tvb, offset + 11);
}
break;
case 0x3c:
if(available < 33) { return -1; }
return 33 + (3 * tvb_get_ntohl(tvb, offset + 33));
case 0x3D:
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT +
MC_TYPELEN_INT + MC_TYPELEN_BYTE + MC_TYPELEN_INT +
MC_TYPELEN_INT;
break;
case 0x46: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_BYTE;
case 0x47: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_BOOL + MC_TYPELEN_INT * 3;
case 0x64:
if(available < 5) { return -1; }
return 6 + tvb_get_ntohs(tvb, offset + 3);
case 0x65: return 2;
case 0x66:
if(available < 9) { return -1; }
len = 9;
if( ((gint16)tvb_get_ntohs(tvb, offset + 7)) != -1) { len += 3; }
return len;
break;
case 0x67:
len = 6;
if(available < 6) { return -1; }
if( ((gint16)tvb_get_ntohs(tvb, offset + 4)) != -1) { len += 3; }
break;
case 0x68:
{
gint n;
gint num_items;
gint16 item_id;
len = 4;
if(available < len) { return -1; }
num_items = tvb_get_ntohs(tvb, offset + 2);
for(n = 0; n < num_items; n++) {
if((len+2) > available) { return -1; }
item_id = tvb_get_ntohs(tvb, offset + len);
len += 2;
if(item_id != -1) {
len += 3;
}
}
break;
}
case 0x69: return 6;
case 0x6A: return 5;
case 0x6B: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_SHORT + MC_TYPELEN_SHORT + MC_TYPELEN_SHORT + MC_TYPELEN_SHORT;
case 0x82:
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_SHORT + MC_TYPELEN_INT;
{
/* read four utf16 stings */
guint i = 0;
while ( i < 4 && len != -1 )
{
if ( available >= len + MC_TYPELEN_UCS2LEN )
{
len += tvb_get_ntohs(tvb, offset + len ) * 2 + MC_TYPELEN_UCS2LEN;
if ( len > available )
{
len = -1;
break;
}
}
else
{
len = -1;
break;
}
i++;
}
}
break;
case 0x83:
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_SHORT + MC_TYPELEN_SHORT + MC_TYPELEN_BYTE;
len += tvb_get_guint8(tvb, offset + len);
break;
case 0xC8: return MC_TYPELEN_PDUTYPE + MC_TYPELEN_INT + MC_TYPELEN_BYTE;
case 0xC9:
if ( available >= MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN + MC_TYPELEN_BYTE + MC_TYPELEN_SHORT)
{
len = tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE ) * 2;
len += MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN + MC_TYPELEN_BYTE + MC_TYPELEN_SHORT;
}
break;
case 0xFE: return MC_TYPELEN_PDUTYPE;
case 0xFF:
if ( available >= MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN )
{
len = MC_TYPELEN_PDUTYPE + MC_TYPELEN_UCS2LEN +
tvb_get_ntohs(tvb, offset + MC_TYPELEN_PDUTYPE) * 2;
}
break;
default:
printf("Unknown packet: 0x%x\n", type);
len = 1; /* Not much we can do here */
}
return len;
}
int dissect_minecraft(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint8 packet;
guint offset = 0;
while (offset < tvb_reported_length(tvb)) {
packet = tvb_get_guint8(tvb, offset); // Grab the first byte
// which is used to determine
// the packet type
gint available = tvb_reported_length_remaining(tvb, offset);
gint len = get_minecraft_message_len(packet, offset, available, tvb);
if (len == -1 || len > available) {
pinfo->desegment_offset = offset;
if ( len == -1 ) {
pinfo->desegment_len = DESEGMENT_ONE_MORE_SEGMENT;
return -1;
} else {
pinfo->desegment_len = len - available;
return -pinfo->desegment_len;
}
}
dissect_minecraft_message(tvb, pinfo, tree, packet, offset, len);
offset += len;
}
return offset;
}