mirror of
https://github.com/Mezeporta/Erupe.git
synced 2025-12-15 00:15:08 +01:00
87 lines
2.1 KiB
Go
87 lines
2.1 KiB
Go
package entranceserver
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import (
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"encoding/binary"
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"net"
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"github.com/Andoryuuta/Erupe/config"
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"github.com/Andoryuuta/byteframe"
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)
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func paddedString(x string, size uint) []byte {
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out := make([]byte, size)
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copy(out, x)
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// Null terminate it.
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out[len(out)-1] = 0
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return out
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}
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func encodeServerInfo(serverInfos []config.EntranceServerInfo) []byte {
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bf := byteframe.NewByteFrame()
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for serverIdx, si := range serverInfos {
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bf.WriteUint32(binary.LittleEndian.Uint32(net.ParseIP(si.IP).To4()))
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bf.WriteUint16(16 + uint16(serverIdx))
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bf.WriteUint16(si.Unk2)
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bf.WriteUint16(uint16(len(si.Channels)))
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bf.WriteUint8(si.Type)
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bf.WriteUint8(si.Season)
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bf.WriteUint8(si.Unk6)
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bf.WriteBytes(paddedString(si.Name, 66))
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bf.WriteUint32(si.AllowedClientFlags)
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for channelIdx, ci := range si.Channels {
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bf.WriteUint16(ci.Port)
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bf.WriteUint16(16 + uint16(channelIdx))
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bf.WriteUint16(ci.MaxPlayers)
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bf.WriteUint16(ci.CurrentPlayers)
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bf.WriteUint16(ci.Unk4)
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bf.WriteUint16(ci.Unk5)
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bf.WriteUint16(ci.Unk6)
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bf.WriteUint16(ci.Unk7)
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bf.WriteUint16(ci.Unk8)
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bf.WriteUint16(ci.Unk9)
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bf.WriteUint16(ci.Unk10)
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bf.WriteUint16(ci.Unk11)
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bf.WriteUint16(ci.Unk12)
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bf.WriteUint16(ci.Unk13)
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}
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}
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return bf.Data()
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}
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func makeHeader(data []byte, respType string, entryCount uint16, key byte) []byte {
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bf := byteframe.NewByteFrame()
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bf.WriteBytes([]byte(respType))
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bf.WriteUint16(entryCount)
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bf.WriteUint16(uint16(len(data)))
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if len(data) > 0 {
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bf.WriteUint32(CalcSum32(data))
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bf.WriteBytes(data)
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}
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dataToEncrypt := bf.Data()
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bf = byteframe.NewByteFrame()
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bf.WriteUint8(key)
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bf.WriteBytes(EncryptBin8(dataToEncrypt, key))
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return bf.Data()
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}
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func makeResp(servers []config.EntranceServerInfo) []byte {
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rawServerData := encodeServerInfo(servers)
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bf := byteframe.NewByteFrame()
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bf.WriteBytes(makeHeader(rawServerData, "SV2", uint16(len(servers)), 0x00))
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// TODO(Andoryuuta): Figure out what this user data is.
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// Is it for the friends list at the world selection screen?
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// If so, how does it work without the entrance server connection being authenticated?
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bf.WriteBytes(makeHeader([]byte{}, "USR", 0, 0x00))
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return bf.Data()
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}
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