305 lines
6.7 KiB
Bash
305 lines
6.7 KiB
Bash
#!/usr/bin/env bash
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# packet.sh - play state packets
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# pkt_pos(x, y, z)
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function pkt_pos() {
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res="$(to_ieee754 $1)" # X
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res+="$(to_ieee754 $2)" # Y
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res+="$(to_ieee754 $3)" # Z
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res+="00000000" # yaw
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res+="00000000" # pitch
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res+="00" # bit field; all absolute
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res+="00" # teleport id (?)
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res+="00" # dismount vehicle?
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send_packet "38" "$res"
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log "sent player look and position"
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}
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# pkt_chunk(chunk_x, chunk_z, fill)
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function pkt_chunk() {
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# palettes are really cool once you figure them out :3
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# https://wiki.vg/Protocol#Chunk_Data_And_Update_Light
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local chunk
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local fill
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if [[ $3 == '' ]]; then
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fill='01'
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else
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fill="$3"
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fi
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res="$1" # chunk X
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res+="$2" # chunk Z
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# here goes the scary NBT field
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# nbt tag MOTION_BLOCKING len light data for a superflat map
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res+="0a00000c000f 4d4f54494f4e5f424c4f434b494e47 00000025 010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804010080402010080401008040201008040100804020100804 0000000020100804 00"
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if [[ -f $TEMP/world/$1$2 ]]; then
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chunk=$(cat $TEMP/world/$1$2)
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else
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chunk_header
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l=$(echo -n "8002" | unhex | varint2int)
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chunk+="$(repeat $((l*16)) "$fill")"
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chunk_footer
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echo -n "$chunk" > $TEMP/world/$1$2
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fi
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res+="$(hexstr_len "$chunk")" # Data len
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res+="$chunk" # Chunk data itself
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res+="00 01 00 00 00 00 00 00" # empty bitsets and light arrays
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send_packet "22" "$res"
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log "sending chunk data"
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}
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# pkt_effect(x, y, z, effect_id)
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function pkt_effect() {
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res="$(printf '%08x' $4)"
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res+="$(encode_position $1 $2 $3)"
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res+="00000000"
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res+="00"
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send_packet "23" "$res"
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log "sending effect"
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}
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# pkt_particle(x, y, z, particle_id, count)
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function pkt_particle() {
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res="$(printf '%08x' $4)" # particle id
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res+="01" # long distance
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res+="$(to_ieee754 $1)" # X
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res+="$(to_ieee754 $2)" # Y
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res+="$(to_ieee754 $3)" # Z
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res+="3f800000" # X offset
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res+="3f800000" # Y offset
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res+="3f800000" # Z offset
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res+="00000001" # particle data
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res+="$(printf '%08x' $5)" # particle count
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res+="" # data (left blank)
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send_packet "24" "$res"
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log "sending particle"
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}
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# pkt_playerinfo(name, eid)
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function pkt_playerinfo_add() {
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res="00" # add player
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res+="01" # total players
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res+="0000000000000000000000000000$2" # UUID
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res+="$(str_len "$1")$(echo -n "$1" | xxd -p)"
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res+="00" # array len; can be zero, but no skins then
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res+="01" # gamemode: creative
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res+="01" # ping: 1ms
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res+="00" # has display name: false
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send_packet "36" "$res"
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log "sent playerinfo"
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}
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# pkt_spawnplayer(eid)
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function pkt_spawnplayer() {
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res="$(int2varint $((0x$1)))" # entity id
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res+="0000000000000000000000000000$1" # a really badly made UUID
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res+="00 00 00 00 00 00 00 00" # X
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res+="00 00 00 00 00 00 00 00" # Y
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res+="00 00 00 00 00 00 00 00" # Z
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res+="00" # Angle (256 steps)
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res+="00" # Pitch (...)
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send_packet "04" "$res"
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log "sent spawnplayer"
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}
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# pkt_position(deltaX, deltaY, deltaZ, eid)
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function pkt_position() {
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local deltaX
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local deltaY
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local deltaZ
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local stepX
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local stepY
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local stepZ
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local n
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deltaX=$1
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deltaY=$2
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deltaZ=$3
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stepX=0
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stepY=0
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stepZ=0
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while true; do
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n=false
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if [[ $deltaX -gt 32767 ]]; then
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stepX=32767
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deltaX=$((deltaX-32767))
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n=true
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fi
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if [[ $deltaX -lt -32768 ]]; then
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stepX=-32768
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deltaX=$((deltaX+32768))
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n=true
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fi
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if [[ $deltaY -gt 32767 ]]; then
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stepY=32767
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deltaY=$((deltaY-32767))
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n=true
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fi
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if [[ $deltaY -lt -32768 ]]; then
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stepY=-32768
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deltaY=$((deltaY+32768))
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n=true
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fi
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if [[ $deltaZ -gt 32767 ]]; then
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stepZ=32767
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deltaX=$((deltaZ-32767))
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n=true
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fi
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if [[ $deltaZ -lt -32768 ]]; then
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stepZ=-32768
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deltaZ=$((deltaZ+32768))
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n=true
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fi
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[[ $n == false ]] && break
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pkt_position $stepX $stepY $stepZ
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done
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res="$(int2varint $((0x$4)))" # entity ID
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res+="$(to_short $deltaX)"
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res+="$(to_short $deltaY)"
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res+="$(to_short $deltaZ)"
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res+="00" # on ground
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send_packet "29" "$res"
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}
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# pkt_chatmessage(msg, sender_uuid)
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function pkt_chatmessage() {
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local msg
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local json
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local res
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msg=$(sed -E 's/"//g;s@\\@@g' <<< "$1")
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json='{"text":"'"$msg"'"}'
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res="$(str_len "$json")$(echo -n "$json" | xxd -p)"
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res+="00" # position: chat box
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res+="$2"
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send_packet "0f" "$res"
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}
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# pkt_title(msg)
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function pkt_title() {
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local txt
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txt='{"text":"'"$1"'"}'
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res="$(str_len "$txt")$(echo -n "$txt" | xxd -p)"
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send_packet "5a" "$res"
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}
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# pkt_subtitle(msg)
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function pkt_subtitle() {
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local txt
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txt='{"text":"'"$1"'"}'
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res="$(str_len "$txt")$(echo -n "$txt" | xxd -p)"
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send_packet "58" "$res"
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}
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# pkt_disconnect(reason)
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function pkt_disconnect() {
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txt='{"text":"'"$1"'"}'
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res="$(str_len "$txt")$(echo -n "$txt" | xxd -p)"
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send_packet "1a" "$res"
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pkill -P $$
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pkt_chatmessage "- $nick" "00000000000000000000000000000000" > $TEMP/players/$nick/broadcast
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sleep 0.3
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rm -R "$TEMP/players/$nick"
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exit
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}
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# pkt_experience(lvl)
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function pkt_experience() {
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res="00000000" # experience bar
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res+="$(int2varint $1)"
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res+="00"
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send_packet "51" "$res"
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}
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# pkt_inventory(items)
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function pkt_inventory() {
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local -n _items=$1
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res="00" # inventory id
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res+="00" # state
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res+="$(int2varint ${#_items[@]})" # item count
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for i in ${!_items[@]}; do
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if [[ $i == 0 ]]; then
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res+="00"
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else
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res+="01 $(int2varint ${_items[$i]}) 01 00"
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fi
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done
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res+="01 00 01 00"
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send_packet "14" "$res"
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log "sent inventory"
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}
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# pkt_digginack(x, y, z, block, status)
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function pkt_diggingack() {
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res="$(encode_position $1 $2 $3)"
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res+="$4"
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res+="$5"
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res+="01"
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send_packet "08" "$res"
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log "sent dig ack"
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}
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# pkt_blockbreak(x, y, z, stage)
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function pkt_blockbreak() {
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res="$(int2varint $((0x$eid)))"
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res+="$(encode_position $1 $2 $3)"
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res+="$4"
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send_packet "09" "$res"
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}
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# pkt_soundeffect(x, y, z, id)
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# TODO: unbreak this
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function pkt_soundeffect() {
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res="$(int2varint $4)" # sound ID
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res+="05" # "block" category
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res+="$(printf '%08x' $(($1*8)))" # x
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res+="$(printf '%08x' $(($2*8)))" # y
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res+="$(printf '%08x' $(($3*8)))" # z
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res+="3f800000" # volume
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res+="3f800000" # pitch
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send_packet "5d" "$res"
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log "sound $(hexpacket_len "$res")5d$res"
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}
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# pkt_sendblock(x, y, z, id)
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function pkt_sendblock() {
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res="$(encode_position $1 $2 $3)"
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res+="$(int2varint $4)"
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send_packet "0c" "$res"
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}
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# send_packet(id, payload)
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function send_packet() {
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echo -n "$(hexpacket_len "$2")$1$2" | unhex
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}
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