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feat(pcap): complete replay system with filtering, metadata, and live replay

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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.
This commit is contained in:
Houmgaor
2026-02-23 19:34:30 +01:00
parent 7ef5efc549
commit f712e3c04d
14 changed files with 679 additions and 42 deletions
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24
server/channelserver/sys_capture.go
View File

@@ -14,25 +14,26 @@ import (
)
// startCapture wraps a network.Conn with a RecordingConn if capture is enabled.
// Returns the (possibly wrapped) conn and a cleanup function that must be called on session close.
func startCapture(server *Server, conn network.Conn, remoteAddr net.Addr, serverType pcap.ServerType) (network.Conn, func()) {
// Returns the (possibly wrapped) conn, the RecordingConn (nil if capture disabled),
// and a cleanup function that must be called on session close.
func startCapture(server *Server, conn network.Conn, remoteAddr net.Addr, serverType pcap.ServerType) (network.Conn, *pcap.RecordingConn, func()) {
capCfg := server.erupeConfig.Capture
if !capCfg.Enabled {
return conn, func() {}
return conn, nil, func() {}
}
switch serverType {
case pcap.ServerTypeSign:
if !capCfg.CaptureSign {
return conn, func() {}
return conn, nil, func() {}
}
case pcap.ServerTypeEntrance:
if !capCfg.CaptureEntrance {
return conn, func() {}
return conn, nil, func() {}
}
case pcap.ServerTypeChannel:
if !capCfg.CaptureChannel {
return conn, func() {}
return conn, nil, func() {}
}
}
@@ -42,7 +43,7 @@ func startCapture(server *Server, conn network.Conn, remoteAddr net.Addr, server
}
if err := os.MkdirAll(outputDir, 0o755); err != nil {
server.logger.Warn("Failed to create capture directory", zap.Error(err))
return conn, func() {}
return conn, nil, func() {}
}
now := time.Now()
@@ -56,7 +57,7 @@ func startCapture(server *Server, conn network.Conn, remoteAddr net.Addr, server
f, err := os.Create(path)
if err != nil {
server.logger.Warn("Failed to create capture file", zap.Error(err), zap.String("path", path))
return conn, func() {}
return conn, nil, func() {}
}
startNs := now.UnixNano()
@@ -75,12 +76,13 @@ func startCapture(server *Server, conn network.Conn, remoteAddr net.Addr, server
if err != nil {
server.logger.Warn("Failed to initialize capture writer", zap.Error(err))
_ = f.Close()
return conn, func() {}
return conn, nil, func() {}
}
server.logger.Info("Capture started", zap.String("file", path))
rc := pcap.NewRecordingConn(conn, w, startNs)
rc := pcap.NewRecordingConn(conn, w, startNs, capCfg.ExcludeOpcodes)
rc.SetCaptureFile(f, &meta)
cleanup := func() {
if err := w.Flush(); err != nil {
server.logger.Warn("Failed to flush capture", zap.Error(err))
@@ -91,7 +93,7 @@ func startCapture(server *Server, conn network.Conn, remoteAddr net.Addr, server
server.logger.Info("Capture saved", zap.String("file", path))
}
return rc, cleanup
return rc, rc, cleanup
}
// sanitizeAddr replaces characters that are problematic in filenames.