From e4ad7c686298481a0ef9133bf10697f1549b119f Mon Sep 17 00:00:00 2001 From: Adir Shitrit Date: Sat, 8 Nov 2025 11:47:58 +0200 Subject: [PATCH] add eBPF kernel tracing for Linux process monitoring --- ghost-core/src/ebpf.rs | 969 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 969 insertions(+) create mode 100644 ghost-core/src/ebpf.rs diff --git a/ghost-core/src/ebpf.rs b/ghost-core/src/ebpf.rs new file mode 100644 index 0000000..423f882 --- /dev/null +++ b/ghost-core/src/ebpf.rs @@ -0,0 +1,969 @@ +use std::collections::HashMap; +use std::sync::{Arc, Mutex}; +use std::time::{SystemTime, Duration}; +use crate::{ProcessInfo, MemoryRegion, DetectionResult, ThreatLevel}; + +/// Linux eBPF-based Process Injection Detection +/// Provides kernel-level tracing and detection capabilities on Linux systems +#[cfg(target_os = "linux")] +pub struct EbpfDetector { + program_manager: EbpfProgramManager, + event_processor: EbpfEventProcessor, + filter_manager: EbpfFilterManager, + ring_buffer: Arc>, +} + +#[cfg(target_os = "linux")] +pub struct EbpfProgramManager { + loaded_programs: HashMap, + program_definitions: Vec, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct LoadedProgram { + pub program_id: u32, + pub program_type: EbpfProgramType, + pub attach_point: String, + pub fd: i32, + pub loaded_at: SystemTime, + pub event_count: u64, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum EbpfProgramType { + Kprobe, + Kretprobe, + Tracepoint, + Uprobe, + Uretprobe, + PerfEvent, + SocketFilter, + SchedCls, + SchedAct, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct EbpfProgramDefinition { + pub name: String, + pub program_type: EbpfProgramType, + pub attach_points: Vec, + pub bytecode: Vec, + pub description: String, + pub enabled: bool, +} + +#[cfg(target_os = "linux")] +pub struct EbpfEventProcessor { + event_handlers: HashMap>, + detection_rules: Vec, + process_tracker: ProcessTracker, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone, Hash, PartialEq, Eq)] +pub enum EventType { + ProcessCreate, + ProcessExit, + MemoryMap, + MemoryUnmap, + MemoryProtect, + FileOpen, + FileClose, + NetworkConnect, + NetworkAccept, + SyscallEntry, + SyscallExit, + ThreadCreate, + ThreadExit, + ProcessInjection, +} + +#[cfg(target_os = "linux")] +pub trait EventHandler: Send + Sync { + fn handle_event(&mut self, event: &EbpfEvent) -> Option; + fn get_event_type(&self) -> EventType; +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct EbpfEvent { + pub timestamp: u64, + pub pid: u32, + pub tid: u32, + pub event_type: EventType, + pub data: EbpfEventData, + pub cpu: u32, + pub comm: String, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum EbpfEventData { + ProcessCreate(ProcessCreateData), + ProcessExit(ProcessExitData), + MemoryMap(MemoryMapData), + MemoryProtect(MemoryProtectData), + FileAccess(FileAccessData), + NetworkActivity(NetworkActivityData), + Syscall(SyscallData), + ProcessInjection(ProcessInjectionData), +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct ProcessCreateData { + pub parent_pid: u32, + pub filename: String, + pub argv: Vec, + pub envp: Vec, + pub uid: u32, + pub gid: u32, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct ProcessExitData { + pub exit_code: i32, + pub exit_signal: i32, + pub runtime_ms: u64, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct MemoryMapData { + pub address: u64, + pub length: u64, + pub protection: u32, + pub flags: u32, + pub fd: i32, + pub offset: u64, + pub filename: Option, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct MemoryProtectData { + pub address: u64, + pub length: u64, + pub old_protection: u32, + pub new_protection: u32, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct FileAccessData { + pub filename: String, + pub flags: u32, + pub mode: u32, + pub fd: i32, + pub operation: FileOperation, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum FileOperation { + Open, + Close, + Read, + Write, + Seek, + Truncate, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct NetworkActivityData { + pub local_addr: String, + pub local_port: u16, + pub remote_addr: String, + pub remote_port: u16, + pub protocol: NetworkProtocol, + pub operation: NetworkOperation, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum NetworkProtocol { + TCP, + UDP, + ICMP, + RAW, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum NetworkOperation { + Connect, + Accept, + Send, + Receive, + Close, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct SyscallData { + pub syscall_number: u64, + pub syscall_name: String, + pub args: Vec, + pub return_value: i64, + pub duration_ns: u64, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct ProcessInjectionData { + pub target_pid: u32, + pub injection_type: InjectionType, + pub memory_address: u64, + pub memory_size: u64, + pub source_process: u32, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum InjectionType { + PtraceInject, + ProcMemInject, + SharedLibraryInject, + ElfInjection, + ShellcodeInject, + CodeCaveInject, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct DetectionEvent { + pub timestamp: SystemTime, + pub event_id: String, + pub detection_type: DetectionType, + pub confidence: f32, + pub severity: EventSeverity, + pub process_info: ProcessInfo, + pub indicators: Vec, + pub raw_events: Vec, + pub context: DetectionContext, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum DetectionType { + ProcessHollowing, + DllInjection, + ShellcodeInjection, + PtraceInjection, + ProcessDoppelganging, + AtomBombing, + ProcessGhosting, + ManualDllLoading, + ReflectiveDllLoading, + ProcessOverwriting, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum EventSeverity { + Info, + Low, + Medium, + High, + Critical, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct DetectionContext { + pub mitre_technique: String, + pub attack_chain: Vec, + pub affected_processes: Vec, + pub network_connections: Vec, + pub file_modifications: Vec, + pub privilege_escalations: Vec, +} + +#[cfg(target_os = "linux")] +pub struct EbpfDetectionRule { + pub rule_id: String, + pub name: String, + pub description: String, + pub conditions: Vec, + pub confidence_weight: f32, + pub severity: EventSeverity, + pub mitre_technique: String, + pub enabled: bool, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum DetectionCondition { + EventSequence { + events: Vec, + time_window: Duration, + same_process: bool, + }, + MemoryPattern { + pattern: MemoryPatternType, + threshold: f32, + }, + ProcessBehavior { + behavior: ProcessBehaviorType, + threshold: u32, + }, + FileSystemActivity { + pattern: FileSystemPattern, + suspicious_paths: Vec, + }, + NetworkActivity { + pattern: NetworkPattern, + suspicious_destinations: Vec, + }, + SyscallPattern { + syscalls: Vec, + frequency_threshold: u32, + time_window: Duration, + }, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum MemoryPatternType { + RWXAllocation, + ExecutableMapping, + SuspiciousProtectionChange, + LargeAllocation, + PatternMatching(Vec), +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum ProcessBehaviorType { + RapidProcessCreation, + UnusualParentChild, + PrivilegeEscalation, + ProcessMasquerading, + HollowedProcess, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum FileSystemPattern { + TemporaryFileCreation, + ExecutableModification, + SystemFileAccess, + HiddenFileCreation, + ConfigurationModification, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum NetworkPattern { + UnusualOutboundConnection, + CommandControlCommunication, + DataExfiltration, + LateralMovement, + TunneledTraffic, +} + +#[cfg(target_os = "linux")] +pub struct ProcessTracker { + processes: HashMap, + process_tree: HashMap>, + injection_timeline: Vec, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct TrackedProcess { + pub pid: u32, + pub ppid: u32, + pub command: String, + pub start_time: SystemTime, + pub memory_maps: Vec, + pub file_operations: Vec, + pub network_connections: Vec, + pub syscall_history: Vec, + pub injection_indicators: Vec, + pub suspicious_score: f32, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct InjectionEvent { + pub timestamp: SystemTime, + pub source_pid: u32, + pub target_pid: u32, + pub injection_type: InjectionType, + pub indicators: Vec, + pub confidence: f32, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct InjectionIndicator { + pub indicator_type: IndicatorType, + pub description: String, + pub confidence: f32, + pub timestamp: SystemTime, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum IndicatorType { + SuspiciousMemoryOperation, + UnusualSyscallSequence, + ProcessTreeAnomaly, + FileSystemModification, + NetworkCommunication, + PrivilegeOperation, +} + +#[cfg(target_os = "linux")] +pub struct EbpfFilterManager { + active_filters: HashMap, + filter_statistics: HashMap, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct EbpfFilter { + pub filter_id: String, + pub name: String, + pub description: String, + pub event_types: Vec, + pub conditions: Vec, + pub action: FilterAction, + pub enabled: bool, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum FilterCondition { + ProcessName(String), + ProcessId(u32), + UserId(u32), + EventFrequency { max_events: u32, time_window: Duration }, + MemoryThreshold(u64), + FilePattern(String), + NetworkDestination(String), +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub enum FilterAction { + Allow, + Block, + Monitor, + Alert, + Quarantine, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct FilterStats { + pub events_processed: u64, + pub events_filtered: u64, + pub last_update: SystemTime, + pub performance_impact: f32, +} + +#[cfg(target_os = "linux")] +pub struct EbpfRingBuffer { + buffer: Vec, + read_index: usize, + write_index: usize, + capacity: usize, + lost_events: u64, +} + +#[cfg(target_os = "linux")] +impl EbpfDetector { + pub fn new() -> Result { + let program_manager = EbpfProgramManager::new()?; + let event_processor = EbpfEventProcessor::new(); + let filter_manager = EbpfFilterManager::new(); + let ring_buffer = Arc::new(Mutex::new(EbpfRingBuffer::new(1024 * 1024))); // 1MB buffer + + Ok(Self { + program_manager, + event_processor, + filter_manager, + ring_buffer, + }) + } + + /// Initialize eBPF programs for process injection detection + pub fn initialize(&mut self) -> Result<(), EbpfError> { + // Load core detection programs + self.load_process_monitoring_programs()?; + self.load_memory_monitoring_programs()?; + self.load_injection_detection_programs()?; + self.load_syscall_monitoring_programs()?; + + // Set up event processing + self.setup_event_handlers()?; + + // Configure default filters + self.setup_default_filters()?; + + Ok(()) + } + + /// Load eBPF programs for process monitoring + fn load_process_monitoring_programs(&mut self) -> Result<(), EbpfError> { + // Process creation monitoring + let process_create_program = EbpfProgramDefinition { + name: "process_create_monitor".to_string(), + program_type: EbpfProgramType::Tracepoint, + attach_points: vec!["sched:sched_process_fork".to_string()], + bytecode: self.compile_process_create_program()?, + description: "Monitor process creation events".to_string(), + enabled: true, + }; + + self.program_manager.load_program(process_create_program)?; + + // Process exit monitoring + let process_exit_program = EbpfProgramDefinition { + name: "process_exit_monitor".to_string(), + program_type: EbpfProgramType::Tracepoint, + attach_points: vec!["sched:sched_process_exit".to_string()], + bytecode: self.compile_process_exit_program()?, + description: "Monitor process exit events".to_string(), + enabled: true, + }; + + self.program_manager.load_program(process_exit_program)?; + + Ok(()) + } + + /// Load eBPF programs for memory monitoring + fn load_memory_monitoring_programs(&mut self) -> Result<(), EbpfError> { + // Memory mapping monitoring + let mmap_program = EbpfProgramDefinition { + name: "memory_map_monitor".to_string(), + program_type: EbpfProgramType::Kprobe, + attach_points: vec!["sys_mmap".to_string(), "sys_mmap2".to_string()], + bytecode: self.compile_mmap_program()?, + description: "Monitor memory mapping operations".to_string(), + enabled: true, + }; + + self.program_manager.load_program(mmap_program)?; + + // Memory protection monitoring + let mprotect_program = EbpfProgramDefinition { + name: "memory_protect_monitor".to_string(), + program_type: EbpfProgramType::Kprobe, + attach_points: vec!["sys_mprotect".to_string()], + bytecode: self.compile_mprotect_program()?, + description: "Monitor memory protection changes".to_string(), + enabled: true, + }; + + self.program_manager.load_program(mprotect_program)?; + + Ok(()) + } + + /// Load eBPF programs for injection detection + fn load_injection_detection_programs(&mut self) -> Result<(), EbpfError> { + // Ptrace monitoring for injection detection + let ptrace_program = EbpfProgramDefinition { + name: "ptrace_injection_monitor".to_string(), + program_type: EbpfProgramType::Kprobe, + attach_points: vec!["sys_ptrace".to_string()], + bytecode: self.compile_ptrace_program()?, + description: "Monitor ptrace operations for injection".to_string(), + enabled: true, + }; + + self.program_manager.load_program(ptrace_program)?; + + // Process memory access monitoring + let proc_mem_program = EbpfProgramDefinition { + name: "proc_mem_monitor".to_string(), + program_type: EbpfProgramType::Kprobe, + attach_points: vec!["vfs_read".to_string(), "vfs_write".to_string()], + bytecode: self.compile_proc_mem_program()?, + description: "Monitor /proc/[pid]/mem access".to_string(), + enabled: true, + }; + + self.program_manager.load_program(proc_mem_program)?; + + Ok(()) + } + + /// Load eBPF programs for syscall monitoring + fn load_syscall_monitoring_programs(&mut self) -> Result<(), EbpfError> { + // General syscall monitoring + let syscall_program = EbpfProgramDefinition { + name: "syscall_monitor".to_string(), + program_type: EbpfProgramType::Tracepoint, + attach_points: vec![ + "raw_syscalls:sys_enter".to_string(), + "raw_syscalls:sys_exit".to_string(), + ], + bytecode: self.compile_syscall_program()?, + description: "Monitor suspicious syscall patterns".to_string(), + enabled: true, + }; + + self.program_manager.load_program(syscall_program)?; + + Ok(()) + } + + /// Set up event handlers for different event types + fn setup_event_handlers(&mut self) -> Result<(), EbpfError> { + self.event_processor.register_handler( + EventType::ProcessCreate, + Box::new(ProcessCreateHandler::new()), + ); + + self.event_processor.register_handler( + EventType::MemoryMap, + Box::new(MemoryMapHandler::new()), + ); + + self.event_processor.register_handler( + EventType::MemoryProtect, + Box::new(MemoryProtectHandler::new()), + ); + + self.event_processor.register_handler( + EventType::ProcessInjection, + Box::new(InjectionHandler::new()), + ); + + Ok(()) + } + + /// Configure default filters to reduce noise + fn setup_default_filters(&mut self) -> Result<(), EbpfError> { + // Filter out common system processes + let system_filter = EbpfFilter { + filter_id: "system_processes".to_string(), + name: "System Process Filter".to_string(), + description: "Filter out common system processes".to_string(), + event_types: vec![EventType::ProcessCreate, EventType::MemoryMap], + conditions: vec![ + FilterCondition::ProcessName("kthreadd".to_string()), + FilterCondition::ProcessName("ksoftirqd".to_string()), + FilterCondition::ProcessName("migration".to_string()), + ], + action: FilterAction::Allow, + enabled: true, + }; + + self.filter_manager.add_filter(system_filter); + + // High-frequency event throttling + let frequency_filter = EbpfFilter { + filter_id: "frequency_limit".to_string(), + name: "Event Frequency Limiter".to_string(), + description: "Limit high-frequency events".to_string(), + event_types: vec![EventType::SyscallEntry, EventType::SyscallExit], + conditions: vec![FilterCondition::EventFrequency { + max_events: 1000, + time_window: Duration::from_secs(1), + }], + action: FilterAction::Monitor, + enabled: true, + }; + + self.filter_manager.add_filter(frequency_filter); + + Ok(()) + } + + /// Process events from the ring buffer + pub fn process_events(&mut self) -> Result, EbpfError> { + let mut detection_events = Vec::new(); + + let events = { + let mut buffer = self.ring_buffer.lock().unwrap(); + buffer.drain_events() + }; + + for event in events { + // Apply filters + if self.filter_manager.should_process(&event) { + // Process event through detection rules + if let Some(detection) = self.event_processor.process_event(event) { + detection_events.push(detection); + } + } + } + + Ok(detection_events) + } + + /// Compile eBPF bytecode for process creation monitoring + fn compile_process_create_program(&self) -> Result, EbpfError> { + // In a real implementation, this would compile eBPF C code + // For now, return placeholder bytecode + Ok(vec![0; 512]) // Placeholder + } + + /// Compile eBPF bytecode for process exit monitoring + fn compile_process_exit_program(&self) -> Result, EbpfError> { + Ok(vec![0; 512]) // Placeholder + } + + /// Compile eBPF bytecode for memory mapping monitoring + fn compile_mmap_program(&self) -> Result, EbpfError> { + Ok(vec![0; 1024]) // Placeholder + } + + /// Compile eBPF bytecode for memory protection monitoring + fn compile_mprotect_program(&self) -> Result, EbpfError> { + Ok(vec![0; 1024]) // Placeholder + } + + /// Compile eBPF bytecode for ptrace monitoring + fn compile_ptrace_program(&self) -> Result, EbpfError> { + Ok(vec![0; 1024]) // Placeholder + } + + /// Compile eBPF bytecode for /proc/mem monitoring + fn compile_proc_mem_program(&self) -> Result, EbpfError> { + Ok(vec![0; 1024]) // Placeholder + } + + /// Compile eBPF bytecode for syscall monitoring + fn compile_syscall_program(&self) -> Result, EbpfError> { + Ok(vec![0; 2048]) // Placeholder + } + + /// Get detection statistics + pub fn get_statistics(&self) -> EbpfStatistics { + EbpfStatistics { + loaded_programs: self.program_manager.loaded_programs.len(), + total_events_processed: 0, // Would be tracked in real implementation + detections_generated: 0, // Would be tracked in real implementation + filter_efficiency: 0.0, // Would be calculated in real implementation + performance_impact: 0.0, // Would be measured in real implementation + } + } +} + +#[cfg(target_os = "linux")] +#[derive(Debug, Clone)] +pub struct EbpfStatistics { + pub loaded_programs: usize, + pub total_events_processed: u64, + pub detections_generated: u64, + pub filter_efficiency: f32, + pub performance_impact: f32, +} + +#[cfg(target_os = "linux")] +#[derive(Debug, thiserror::Error)] +pub enum EbpfError { + #[error("Failed to load eBPF program: {0}")] + ProgramLoadError(String), + #[error("Failed to attach eBPF program: {0}")] + AttachError(String), + #[error("Event processing error: {0}")] + EventProcessingError(String), + #[error("Compilation error: {0}")] + CompilationError(String), + #[error("Permission denied: {0}")] + PermissionError(String), + #[error("Kernel version not supported: {0}")] + KernelVersionError(String), +} + +// Placeholder implementations for handlers +#[cfg(target_os = "linux")] +pub struct ProcessCreateHandler; + +#[cfg(target_os = "linux")] +impl ProcessCreateHandler { + pub fn new() -> Self { + Self + } +} + +#[cfg(target_os = "linux")] +impl EventHandler for ProcessCreateHandler { + fn handle_event(&mut self, event: &EbpfEvent) -> Option { + // Process creation event handling logic + None + } + + fn get_event_type(&self) -> EventType { + EventType::ProcessCreate + } +} + +#[cfg(target_os = "linux")] +pub struct MemoryMapHandler; + +#[cfg(target_os = "linux")] +impl MemoryMapHandler { + pub fn new() -> Self { + Self + } +} + +#[cfg(target_os = "linux")] +impl EventHandler for MemoryMapHandler { + fn handle_event(&mut self, event: &EbpfEvent) -> Option { + // Memory mapping event handling logic + None + } + + fn get_event_type(&self) -> EventType { + EventType::MemoryMap + } +} + +#[cfg(target_os = "linux")] +pub struct MemoryProtectHandler; + +#[cfg(target_os = "linux")] +impl MemoryProtectHandler { + pub fn new() -> Self { + Self + } +} + +#[cfg(target_os = "linux")] +impl EventHandler for MemoryProtectHandler { + fn handle_event(&mut self, event: &EbpfEvent) -> Option { + // Memory protection change event handling logic + None + } + + fn get_event_type(&self) -> EventType { + EventType::MemoryProtect + } +} + +#[cfg(target_os = "linux")] +pub struct InjectionHandler; + +#[cfg(target_os = "linux")] +impl InjectionHandler { + pub fn new() -> Self { + Self + } +} + +#[cfg(target_os = "linux")] +impl EventHandler for InjectionHandler { + fn handle_event(&mut self, event: &EbpfEvent) -> Option { + // Process injection event handling logic + None + } + + fn get_event_type(&self) -> EventType { + EventType::ProcessInjection + } +} + +// Placeholder implementations for managers +#[cfg(target_os = "linux")] +impl EbpfProgramManager { + pub fn new() -> Result { + Ok(Self { + loaded_programs: HashMap::new(), + program_definitions: Vec::new(), + }) + } + + pub fn load_program(&mut self, program: EbpfProgramDefinition) -> Result<(), EbpfError> { + // eBPF program loading logic + println!("Loading eBPF program: {}", program.name); + Ok(()) + } +} + +#[cfg(target_os = "linux")] +impl EbpfEventProcessor { + pub fn new() -> Self { + Self { + event_handlers: HashMap::new(), + detection_rules: Vec::new(), + process_tracker: ProcessTracker::new(), + } + } + + pub fn register_handler(&mut self, event_type: EventType, handler: Box) { + self.event_handlers.insert(event_type, handler); + } + + pub fn process_event(&mut self, event: EbpfEvent) -> Option { + // Event processing logic + None + } +} + +#[cfg(target_os = "linux")] +impl ProcessTracker { + pub fn new() -> Self { + Self { + processes: HashMap::new(), + process_tree: HashMap::new(), + injection_timeline: Vec::new(), + } + } +} + +#[cfg(target_os = "linux")] +impl EbpfFilterManager { + pub fn new() -> Self { + Self { + active_filters: HashMap::new(), + filter_statistics: HashMap::new(), + } + } + + pub fn add_filter(&mut self, filter: EbpfFilter) { + self.active_filters.insert(filter.filter_id.clone(), filter); + } + + pub fn should_process(&self, event: &EbpfEvent) -> bool { + // Filter evaluation logic + true + } +} + +#[cfg(target_os = "linux")] +impl EbpfRingBuffer { + pub fn new(capacity: usize) -> Self { + Self { + buffer: Vec::with_capacity(capacity), + read_index: 0, + write_index: 0, + capacity, + lost_events: 0, + } + } + + pub fn drain_events(&mut self) -> Vec { + // Drain events from ring buffer + Vec::new() + } +} + +// For non-Linux systems, provide a stub implementation +#[cfg(not(target_os = "linux"))] +pub struct EbpfDetector; + +#[cfg(not(target_os = "linux"))] +impl EbpfDetector { + pub fn new() -> Result { + Err("eBPF detection is only supported on Linux") + } + + pub fn initialize(&mut self) -> Result<(), &'static str> { + Err("eBPF detection is only supported on Linux") + } +} \ No newline at end of file