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MCPC_dissect
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MCPC_dissect/protocol_tree_play.c

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#include "protocol.h"
#include "protocol_constants.h"
#include "protocol_tree.h"
#include "protocol_tree_internal.h"
static guint add_metadata(proto_tree *packet_tree, tvbuff_t *tvb, const void *data, guint length, guint readed);
#define HANDLER_ARGS proto_tree *packet_tree, tvbuff_t *tvb, const void *data, guint length, guint readed
#define HANDLER(func) static void func(HANDLER_ARGS)
typedef void (*play_handler)(HANDLER_ARGS);
HANDLER(sb_respack_stat) {
int8_t varlen;
uint32_t varint;
varlen=VarIntToUint(data, &varint, length);
proto_tree_add_uint(packet_tree, hf_resourcepack_state, tvb, (gint)readed, varlen, varint);
}
HANDLER(sb_plugin_channel) {
int8_t varlen;
uint32_t varint;
STR_TO_TREE(packet_tree, hf_channel_name);
}
HANDLER(cb_join) {
int8_t varlen;
uint32_t varint;
proto_tree_add_uint(packet_tree, hf_entity_id, tvb, (gint)readed, 4, be32toh(*(const uint32_t*)(data+readed)));
readed+=4;
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 1, FALSE),
"Gamemode: %hhu", *(const uint8_t*)(data+readed));
readed+=1;
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 4, FALSE),
"Dimension: %d", be32toh(*(const int32_t*)(data+readed)));
readed+=4;
proto_tree_add_uint(packet_tree, hf_difficulty, tvb, (gint)readed, 1, *(const uint8_t*)(data+readed));
readed+=1;
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 1, FALSE),
"Max Players: %hhu", *(const uint8_t*)(data+readed));
readed+=1;
CUSTOM_STR_TO_TREE(packet_tree, "Level Type: %s");
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 1, FALSE),
"Reduced Debug Info: %s", *(const uint8_t*)(data+readed) ? "true" : "false");
}
HANDLER(cb_entity_metadata) {
int8_t varlen;
uint32_t varint;
varlen=VarIntToUint(data+readed, &varint, length-(guint)readed);
proto_tree_add_uint(packet_tree, hf_entity_id, tvb, (gint)readed, varlen, varint);
readed+=varlen;
add_metadata(packet_tree, tvb, data, length, readed);
}
HANDLER(cb_spawn_player) {
int8_t varlen;
uint32_t varint;
varlen=VarIntToUint(data+readed, &varint, length-(guint)readed);
proto_tree_add_uint(packet_tree, hf_entity_id, tvb, (gint)readed, varlen, varint);
readed+=varlen;//Entity ID
UUID_TO_TREE(packet_tree);//UUID
POS_TO_TREE(packet_tree);//XYZ
readed+=2;//Skip rotation
add_metadata(packet_tree, tvb, data, length, readed);
}
HANDLER(cb_chunk_data) {
int8_t varlen;
uint32_t varint;
//Chunk coo
proto_tree_add_int(packet_tree, hf_chunk_x, tvb, (gint)readed, 4, be32toh(*(const uint32_t*)(data+readed)));
readed+=4;
proto_tree_add_int(packet_tree, hf_chunk_z, tvb, (gint)readed, 4, be32toh(*(const uint32_t*)(data+readed)));
readed+=4;
//GUC
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 1, FALSE),
"Ground-Up Continuous: %s", *(const uint8_t*)(data+readed) ? "true" : "false");
readed+=1;
//PBM
uint32_t pbm;
varlen=VarIntToUint(data+readed, &pbm, length-(guint)readed);
proto_tree_add_uint(packet_tree, hf_primary_bit_mask, tvb, (gint)readed, varlen, pbm);
readed+=varlen;
varlen=VarIntToUint(data+readed, &varint, length-(guint)readed);
proto_tree_add_uint(packet_tree, hf_size, tvb, (gint)readed, varlen, varint);
readed+=varlen;
proto_item *data_item = proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, varint, FALSE);
proto_item_set_text(data_item, "Data");
proto_tree *data_tree = proto_item_add_subtree(data_item, 0);
for(uint8_t i=0; i < 16; i++) {
if(!(pbm >> i))
break;
else if (!((pbm >> i)&1))
continue;
uint32_t psz;
guint sectionSize = 0;
proto_item *section_item = proto_tree_add_uint(data_tree, hf_section_number, tvb, (gint)readed, (gint)sectionSize, i);
proto_tree *section_tree = proto_item_add_subtree(section_item, 0);
proto_tree_add_uint(section_tree, hf_bits_per_block, tvb, (gint)readed, 1, *(const uint8_t*)(data+readed));
sectionSize+=1;
varlen=VarIntToUint(data+readed+sectionSize, &psz, length-(guint)readed-sectionSize);
proto_tree_add_uint(section_tree, hf_palette_length, tvb, (gint)(readed+sectionSize), varlen, psz);
sectionSize+=varlen;
if(psz!=0) {
proto_item *palette= proto_tree_add_item(section_tree, hf_palette, tvb, (gint)(readed+sectionSize), varlen, ENC_NA);
for(uint32_t pl=0; pl<psz; pl++) {
varlen=VarIntToUint(data+readed+sectionSize, &varint, length-(guint)readed-sectionSize);
sectionSize+=varlen;
}
proto_item_set_end(palette, tvb, (gint)(readed+sectionSize));
}
varlen=VarIntToUint(data+readed+sectionSize, &varint, length-(guint)readed-sectionSize);
sectionSize+=varlen;
sectionSize+=varint*8;//Skip blocks data
sectionSize+=2048;//Skip block light
//FIXME skylight only in overworld
sectionSize+=2048;//Skip sky light
readed+=sectionSize;
proto_item_set_end(section_item, tvb, (gint)readed);
}
}
HANDLER(cb_unload_chunk) {
length;
//Chunk coords
proto_tree_add_int(packet_tree, hf_chunk_x, tvb, (gint)readed, 4, be32toh(*(const uint32_t*)(data+readed)));
readed+=4;
proto_tree_add_int(packet_tree, hf_chunk_z, tvb, (gint)readed, 4, be32toh(*(const uint32_t*)(data+readed)));
readed+=4;
}
//Jump tables
static play_handler cb_340[0x50];
static play_handler sb_340[0x21];
void fill_table(void) {
memset(cb_340, 0, sizeof(cb_340));
cb_340[PID_CB_PLAY_SPAWN_PLAYER]=cb_spawn_player;
cb_340[PID_CB_PLAY_UNLOAD_CHUNK]=cb_unload_chunk;
cb_340[PID_CB_PLAY_CHUNK_DATA]=cb_chunk_data;
cb_340[PID_CB_PLAY_JOIN_GAME]=cb_join;
cb_340[PID_CB_PLAY_ENTITY_METADATA]=cb_entity_metadata;
memset(sb_340, 0, sizeof(sb_340));
sb_340[PID_SB_PLAY_RESOURCE_PACK_STAT]=sb_respack_stat;
sb_340[PID_SB_PLAY_PLUGIN_MESSAGE]=sb_plugin_channel;
}
static guint add_metadata(proto_tree *packet_tree, tvbuff_t *tvb, const void *data, guint length, guint readed) {
while(*((const uint8_t*)data+readed)!=0xFF) {
proto_item *ti;
proto_tree *metadata;
uint32_t varint;
int8_t varlen;
ti=proto_tree_add_item(packet_tree, hf_metadata, tvb, (gint)readed, 0, ENC_NA);
metadata=proto_item_add_subtree(ti, ett_metadata);
const uint8_t index=*(const uint8_t*)(data+readed);
proto_tree_add_uint(metadata, hf_metadata_index, tvb, (gint)readed, 1, index);
proto_item_set_text(ti, "Metadata: %u", index);
readed+=1;
varlen=VarIntToUint(data+readed, &varint, length);
proto_tree_add_uint(metadata, hf_metadata_type, tvb, (gint)readed, varlen, varint);
readed+=varlen;//Type
proto_item *value=proto_tree_add_item(metadata, proto_mcpc, tvb, (gint)readed, 0, ENC_NA);
switch(varint) {
case 0://Byte
proto_item_set_len(value, 1);
proto_item_set_text(value, "Byte: %u", *(const uint8_t*)(data+readed));
readed+=1;
break;
case 1://VarInt
varlen=VarIntToUint(data+readed, &varint, length);
proto_item_set_len(value, varlen);
proto_item_set_text(value, "VerInt: %u", varint);
readed+=varlen;
break;
case 2: {//Float
varint=be32toh(*(const uint32_t*)(data+readed));
proto_item_set_len(value, 4);
proto_item_set_text(value, "Float: %f", (double)*((float*)&varint));
readed+=4;
break;
}
case 3: {//String
varlen=VarIntToUint(data+readed, &varint, length);
{gchar *name=wmem_alloc(wmem_packet_scope(), varint+1);
memcpy(name, data+readed+varlen, varint);
name[varint]=0x00;
proto_item_set_text(value, "String: %s", name);
proto_tree_add_uint(
proto_item_add_subtree(value, ett_strlen),
hf_string_length, tvb, (gint)readed, varlen, varint);
wmem_free(wmem_packet_scope(), name);}
readed+=(uint)varlen+varint;
break;
}
case 4://Chat
case 5://Slot
return -1;
case 6://Boolean
proto_item_set_len(value, 1);
proto_item_set_text(value, "Boolean: %s", *(const uint8_t*)(data+readed) ? "true" : "false");
readed+=1;
break;
case 7://Rotation
case 8://Position
case 9://OptPosition
case 10://Direction(VarInt)
case 11://OptUUID
case 12://OptBlockID(VarInt)
case 13://NBT tag
return -1;
default:
return -1;//Stop parsing on unknown type
}
proto_item_set_end(value, tvb, (gint)readed);
proto_item_set_end(ti, tvb, (gint)readed);
}
return readed;
}
void tree_server_play(proto_tree *packet_tree, tvbuff_t *tvb, packet_info *pinfo _U_, const void *data, guint length){
guint readed;
uint32_t varint;
int8_t varlen;
readed=varlen=VarIntToUint(data, &varint, length);//PacketID
if(varlen>0){
proto_item_append_text(proto_tree_get_parent(proto_tree_get_parent_tree(packet_tree)), ", PID: 0x%X", varint);
proto_tree_add_uint(packet_tree, hf_protocol_packetid_sb, tvb, 0, varlen, varint);
if (sb_340[varint]!=0) {
sb_340[varint](packet_tree, tvb, data, length, readed);
return;
}
switch(varint){
case PID_SB_PLAY_POS_AND_VIEW:
proto_tree_add_double(packet_tree, hf_pos_x, tvb, (gint)readed, 8, (double)be64toh(*(const uint64_t*)(data+readed)));
readed+=8;
proto_tree_add_double(packet_tree, hf_pos_y, tvb, (gint)readed, 8, (double)be64toh(*(const uint64_t*)(data+readed)));
readed+=8;
proto_tree_add_double(packet_tree, hf_pos_z, tvb, (gint)readed, 8, (double)be64toh(*(const uint64_t*)(data+readed)));
readed+=8;
break;
}
}
}
void tree_client_play(proto_tree *packet_tree, tvbuff_t *tvb, packet_info *pinfo _U_, const void *data, guint length){
guint readed;
uint32_t varint;
int8_t varlen;
readed=varlen=VarIntToUint(data, &varint, length);//PacketID
if(varlen>0){
proto_item_append_text(proto_tree_get_parent(proto_tree_get_parent_tree(packet_tree)), ", PID: 0x%X", varint);
proto_tree_add_uint(packet_tree, hf_protocol_packetid_cb, tvb, 0, varlen, varint);
if (cb_340[varint]!=0) {
cb_340[varint](packet_tree, tvb, data, length, readed);
return;
}
switch(varint){
case PID_CB_PLAY_RESPAWN:
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 4, FALSE),
"Dimension: %d", be32toh(*(const int32_t*)(data+readed)));
readed+=4;
proto_tree_add_uint(packet_tree, hf_difficulty, tvb, (gint)readed, 4, *(const uint8_t*)(data+readed));
readed+=1;
proto_item_set_text(
proto_tree_add_item(packet_tree, proto_mcpc, tvb, (gint)readed, 1, FALSE),
"Gamemode: %hhu", *(const uint8_t*)(data+readed));
readed+=1;
CUSTOM_STR_TO_TREE(packet_tree, "Level Type: %s");
break;
case PID_CB_PLAY_SERVER_DIFFICULTY:
proto_tree_add_uint(packet_tree, hf_difficulty, tvb, (gint)readed, 4, *(const uint8_t*)(data+readed));
readed+=1;
break;
case PID_CB_PLAY_RESOURCE_PACK_SEND:
CUSTOM_STR_TO_TREE(packet_tree, "URL: %s");
CUSTOM_STR_TO_TREE(packet_tree, "Hash (SHA-1): %s");
break;
case PID_CB_PLAY_PLUGIN_MESSAGE:
STR_TO_TREE(packet_tree, hf_channel_name);
break;
}
}
}
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