mirror of
https://github.com/Mezeporta/Erupe.git
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e899a2f790
golangci-lint's errcheck rule requires explicit handling of error return values from Close, Write, and Logout calls. Use blank identifier assignment for cleanup paths where errors are intentionally discarded.
107 lines
3.4 KiB
Go
107 lines
3.4 KiB
Go
package protocol
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import (
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"fmt"
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"erupe-ce/common/byteframe"
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"erupe-ce/common/stringsupport"
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"erupe-ce/cmd/protbot/conn"
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)
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// SignResult holds the parsed response from a successful DSGN sign-in.
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type SignResult struct {
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TokenID uint32
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TokenString string // 16 raw bytes as string
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Timestamp uint32
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EntranceAddr string
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CharIDs []uint32
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}
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// DoSign connects to the sign server and performs a DSGN login.
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// Reference: Erupe server/signserver/session.go (handleDSGN) and dsgn_resp.go (makeSignResponse).
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func DoSign(addr, username, password string) (*SignResult, error) {
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c, err := conn.DialWithInit(addr)
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if err != nil {
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return nil, fmt.Errorf("sign connect: %w", err)
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}
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defer func() { _ = c.Close() }()
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// Build DSGN request: "DSGN:041" + \x00 + SJIS(user) + \x00 + SJIS(pass) + \x00 + \x00
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// The server reads: null-terminated request type, null-terminated user, null-terminated pass, null-terminated unk.
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// The request type has a 3-char version suffix (e.g. "041" for ZZ client mode 41) that the server strips.
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bf := byteframe.NewByteFrame()
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bf.WriteNullTerminatedBytes([]byte("DSGN:041")) // reqType with version suffix (server strips last 3 chars to get "DSGN:")
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bf.WriteNullTerminatedBytes(stringsupport.UTF8ToSJIS(username))
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bf.WriteNullTerminatedBytes(stringsupport.UTF8ToSJIS(password))
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bf.WriteUint8(0) // Unk null-terminated empty string
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if err := c.SendPacket(bf.Data()); err != nil {
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return nil, fmt.Errorf("sign send: %w", err)
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}
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resp, err := c.ReadPacket()
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if err != nil {
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return nil, fmt.Errorf("sign recv: %w", err)
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}
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return parseSignResponse(resp)
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}
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// parseSignResponse parses the binary response from the sign server.
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// Reference: Erupe server/signserver/dsgn_resp.go:makeSignResponse
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func parseSignResponse(data []byte) (*SignResult, error) {
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if len(data) < 1 {
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return nil, fmt.Errorf("empty sign response")
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}
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rbf := byteframe.NewByteFrameFromBytes(data)
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resultCode := rbf.ReadUint8()
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if resultCode != 1 { // SIGN_SUCCESS = 1
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return nil, fmt.Errorf("sign failed with code %d", resultCode)
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}
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patchCount := rbf.ReadUint8() // patch server count (usually 2)
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_ = rbf.ReadUint8() // entrance server count (usually 1)
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charCount := rbf.ReadUint8() // character count
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result := &SignResult{}
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result.TokenID = rbf.ReadUint32()
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result.TokenString = string(rbf.ReadBytes(16)) // 16 raw bytes
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result.Timestamp = rbf.ReadUint32()
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// Skip patch server URLs (pascal strings with uint8 length prefix)
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for i := uint8(0); i < patchCount; i++ {
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strLen := rbf.ReadUint8()
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_ = rbf.ReadBytes(uint(strLen))
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}
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// Read entrance server address (pascal string with uint8 length prefix)
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entranceLen := rbf.ReadUint8()
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result.EntranceAddr = string(rbf.ReadBytes(uint(entranceLen - 1)))
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_ = rbf.ReadUint8() // null terminator
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// Read character entries
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for i := uint8(0); i < charCount; i++ {
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charID := rbf.ReadUint32()
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result.CharIDs = append(result.CharIDs, charID)
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_ = rbf.ReadUint16() // HR
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_ = rbf.ReadUint16() // WeaponType
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_ = rbf.ReadUint32() // LastLogin
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_ = rbf.ReadUint8() // IsFemale
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_ = rbf.ReadUint8() // IsNewCharacter
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_ = rbf.ReadUint8() // Old GR
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_ = rbf.ReadUint8() // Use uint16 GR flag
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_ = rbf.ReadBytes(16) // Character name (padded)
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_ = rbf.ReadBytes(32) // Unk desc string (padded)
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// ZZ mode: additional fields
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_ = rbf.ReadUint16() // GR
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_ = rbf.ReadUint8() // Unk
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_ = rbf.ReadUint8() // Unk
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}
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return result, nil
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}
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