mirror of
https://github.com/Mezeporta/Erupe.git
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0e84377e21
Copy MHBridge into the Erupe module as cmd/protbot/ so it can be built, tested, and maintained alongside the server. The bot implements the full sign → entrance → channel login flow and supports lobby entry, chat, session setup, and quest enumeration. The conn/ package keeps its own Blowfish crypto primitives to avoid importing erupe-ce/config (which requires a config file at init).
79 lines
2.0 KiB
Go
79 lines
2.0 KiB
Go
// Package conn provides MHF encrypted connection primitives.
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//
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// This is adapted from Erupe's network/crypt_packet.go to avoid importing
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// erupe-ce/config (whose init() calls os.Exit without a config file).
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package conn
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import (
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"bytes"
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"encoding/binary"
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)
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const CryptPacketHeaderLength = 14
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// CryptPacketHeader represents the parsed information of an encrypted packet header.
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type CryptPacketHeader struct {
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Pf0 byte
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KeyRotDelta byte
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PacketNum uint16
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DataSize uint16
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PrevPacketCombinedCheck uint16
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Check0 uint16
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Check1 uint16
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Check2 uint16
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}
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// NewCryptPacketHeader parses raw bytes into a CryptPacketHeader.
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func NewCryptPacketHeader(data []byte) (*CryptPacketHeader, error) {
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var c CryptPacketHeader
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r := bytes.NewReader(data)
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if err := binary.Read(r, binary.BigEndian, &c.Pf0); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.KeyRotDelta); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.PacketNum); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.DataSize); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.PrevPacketCombinedCheck); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.Check0); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.Check1); err != nil {
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return nil, err
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}
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if err := binary.Read(r, binary.BigEndian, &c.Check2); err != nil {
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return nil, err
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}
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return &c, nil
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}
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// Encode encodes the CryptPacketHeader into raw bytes.
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func (c *CryptPacketHeader) Encode() ([]byte, error) {
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buf := bytes.NewBuffer([]byte{})
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data := []interface{}{
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c.Pf0,
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c.KeyRotDelta,
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c.PacketNum,
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c.DataSize,
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c.PrevPacketCombinedCheck,
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c.Check0,
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c.Check1,
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c.Check2,
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}
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for _, v := range data {
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if err := binary.Write(buf, binary.BigEndian, v); err != nil {
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return nil, err
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}
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}
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return buf.Bytes(), nil
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}
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