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HolyLib:ProcessConnectionlessPacket

  boolean HolyLib:ProcessConnectionlessPacket( bf_read bf, string ip )
0.7

Description

Called when a connectionless packet is received.

This hook is not called if it was disabled using holylib_gameserver_connectionlesspackethook

Arguments

1bf_read bf
The received buffer
2string ip
the ipAddress & port of the sender

Returns

1boolean handled = false
Return true to mark the packet as handled.

Example

Retrieving the A2S_INFO from a Source Engine Server.
function AskForServerInfo(targetIP, challenge) local bf = bitbuf.CreateWriteBuffer(64) bf:WriteLong(-1) -- CONNECTIONLESS_HEADER bf:WriteByte(string.byte("T")) -- A2S_INFO Header bf:WriteString("Source Engine Query") -- Null terminated string if challenge then bf:WriteLong(challenge) -- Challange response if we got a S2C_CHALLENGE end gameserver.SendConnectionlessPacket(bf, targetIP) end function GetServerInfo(targetIP) AskForServerInfo(targetIP) hook.Add("HolyLib:ProcessConnectionlessPacket", "ProcessResponse", function(bf, ip) if ip != targetIP then return end local msgHeader = bf:ReadByte() if msgHeader == string.byte("A") then -- It responded with a S2C_CHALLENGE AskForServerInfo(targetIP, bf:ReadLong()) return true end local a2s_info = { Header = msgHeader, Protocol = bf:ReadByte(), Name = bf:ReadString(), Map = bf:ReadString(), Folder = bf:ReadString(), Game = bf:ReadString(), ID = bf:ReadShort(), Players = bf:ReadByte(), MaxPlayers = bf:ReadByte(), Bots = bf:ReadByte(), ServerType = bf:ReadByte(), Environment = string.char(bf:ReadByte()), Visibility = bf:ReadByte(), VAC = bf:ReadByte(), Version = bf:ReadString(), ExtraDataFlag = bf:ReadByte(), } if bit.band(a2s_info.ExtraDataFlag, 0x80) != 0 then a2s_info.Port = bf:ReadShort() end if bit.band(a2s_info.ExtraDataFlag, 0x10) != 0 then a2s_info.SteamID = bf:ReadLongLong() end if bit.band(a2s_info.ExtraDataFlag, 0x40) != 0 then a2s_info.SourceTVPort = bf:ReadShort() a2s_info.SourceTVName = bf:ReadString() end if bit.band(a2s_info.ExtraDataFlag, 0x20) != 0 then a2s_info.Tags = bf:ReadString() end if bit.band(a2s_info.ExtraDataFlag, 0x01) != 0 then a2s_info.GameID = bf:ReadLongLong() end PrintTable(a2s_info) end) end --- Example call GetServerInfo("xxx.xxx.xxx.xxx:27015")
["Bots"] = 0 ["Environment"] = 108 ["Folder"] = garrysmod ["Game"] = Sandbox ["Header"] = 73 ["ID"] = 4000 ["Map"] = gm_flatgrass ["MaxPlayers"] = 128 ["Name"] = RaphaelIT7's Testing Hell ["Players"] = 0 ["Protocol"] = 17 ["ServerType"] = 100 ["VAC"] = 1 ["Visibility"] = 1

Example

Retrieving the A2S_PLAYER from a Source Engine Server.
function AskForServerPlayerInfo(targetIP, challenge) local bf = bitbuf.CreateWriteBuffer(64) bf:WriteLong(-1) -- CONNECTIONLESS_HEADER bf:WriteByte(string.byte("U")) -- A2S_PLAYER Header bf:WriteUBitLong(challenge or -1, 32) -- Challange response if we got a S2C_CHALLENGE gameserver.SendConnectionlessPacket(bf, targetIP) end function GetServerPlayerInfo(targetIP) AskForServerPlayerInfo(targetIP) hook.Add("HolyLib:ProcessConnectionlessPacket", "ProcessResponse", function(bf, ip) if ip != targetIP then return end local msgHeader = bf:ReadByte() if msgHeader == string.byte("A") then -- It responded with a S2C_CHALLENGE AskForServerPlayerInfo(targetIP, bf:ReadUBitLong(32)) return true end local a2s_player = { Header = string.char(msgHeader), Players = bf:ReadByte(), } for k=1, a2s_player.Players do local entry = {} a2s_player[k] = entry entry.Index = bf:ReadByte() entry.Name = bf:ReadString() entry.Score = bf:ReadLong() entry.Duration = bf:ReadFloat() end PrintTable(a2s_player) end) end --- Example call GetServerPlayerInfo("xxx.xxx.xxx.xxx:27015")
[1]: ["Duration"] = 40.337387084961 ["Index"] = 0 ["Name"] = Raphael ["Score"] = 0 ["Header"] = D ["Players"] = 1