mirror of
https://github.com/Mezeporta/Erupe.git
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f712e3c04d
Wire ExcludeOpcodes config into RecordingConn so configured opcodes (e.g. ping, nop, position) are filtered at record time. Add padded metadata with in-place PatchMetadata to populate CharID/UserID after login. Implement --mode replay using protbot's encrypted connection with timing-aware packet sending, auto-ping response, concurrent S→C collection, and byte-level payload diff reporting.
49 lines
1.4 KiB
Go
49 lines
1.4 KiB
Go
package pcap
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import (
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"encoding/binary"
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"encoding/json"
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"fmt"
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"os"
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)
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// PatchMetadata rewrites the metadata block in a .mhfr capture file.
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// The file must have been written with padded metadata (MinMetadataSize).
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// The new JSON must fit within the existing MetadataLen allocation.
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func PatchMetadata(f *os.File, meta SessionMetadata) error {
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newJSON, err := json.Marshal(&meta)
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if err != nil {
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return fmt.Errorf("pcap: marshal metadata: %w", err)
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}
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// Read MetadataLen from header (offset 20: after magic(4)+version(2)+servertype(1)+clientmode(1)+startnanos(8)+reserved(4)).
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var metaLen uint32
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if _, err := f.Seek(20, 0); err != nil {
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return fmt.Errorf("pcap: seek to metadata len: %w", err)
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}
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if err := binary.Read(f, binary.BigEndian, &metaLen); err != nil {
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return fmt.Errorf("pcap: read metadata len: %w", err)
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}
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if uint32(len(newJSON)) > metaLen {
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return fmt.Errorf("pcap: new metadata (%d bytes) exceeds allocated space (%d bytes)", len(newJSON), metaLen)
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}
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// Pad with spaces to fill the allocated block.
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padded := make([]byte, metaLen)
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copy(padded, newJSON)
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for i := len(newJSON); i < len(padded); i++ {
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padded[i] = ' '
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}
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// Write at offset HeaderSize (32).
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if _, err := f.Seek(HeaderSize, 0); err != nil {
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return fmt.Errorf("pcap: seek to metadata: %w", err)
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}
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if _, err := f.Write(padded); err != nil {
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return fmt.Errorf("pcap: write metadata: %w", err)
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}
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return nil
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}
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