ebpf/ebpftracer/tracer.go

package ebpftracer

import (
	"bytes"
	debugelf "debug/elf"
	"encoding/binary"
	"encoding/hex"
	"errors"
	"fmt"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/cilium/ebpf"
	"github.com/cilium/ebpf/link"
	"github.com/cilium/ebpf/perf"
	"github.com/coroot/coroot-node-agent/common"
	"github.com/coroot/coroot-node-agent/ebpftracer/l7"
	"github.com/coroot/coroot-node-agent/ebpftracer/tracer"
	"github.com/coroot/coroot-node-agent/proc"
	"github.com/coroot/coroot-node-agent/utils"
	"golang.org/x/sys/unix"
	"inet.af/netaddr"
	"k8s.io/klog/v2"
)

/*
#define TASK_COMM_LEN	16
#define BURST_DATA_BUF_SIZE 8192	// For brust send buffer

#include <linux/types.h>

struct __tuple_t {
	__u8 daddr[16];
	__u8 rcv_saddr[16];
	__u8 addr_len;
	__u8 l4_protocol;
	__u16 dport;
	__u16 num;
};

struct __socket_data {
	__u32 pid;
	__u32 tgid;
	__u64 coroutine_id;
	__u8 source;
	__u8 comm[TASK_COMM_LEN];

	__u64 socket_id;
	struct __tuple_t tuple;
	__u32 extra_data;
	__u32 extra_data_count;

	__u32 tcp_seq;
	__u64 thread_trace_id;

	__u64 timestamp;
	__u8  direction: 1;
	__u8  msg_type:  7;

	__u64 syscall_len;
	__u64 data_seq;
	__u16 data_type;
	__u16 data_len;
	char data[BURST_DATA_BUF_SIZE];
} __attribute__((packed));

struct __socket_data_buffer {
	__u32 events_num;
	__u32 len;
	char data[32760];
};
*/
import "C"

type SocketData C.struct___socket_data
type SocketDataBuffer C.struct___socket_data_buffer

const MaxPayloadSize = 1024

type EventType uint32
type EventReason uint32

const (
	EventTypeProcessStart    EventType = 1
	EventTypeProcessExit     EventType = 2
	EventTypeConnectionOpen  EventType = 3
	EventTypeConnectionClose EventType = 4
	EventTypeConnectionError EventType = 5
	EventTypeListenOpen      EventType = 6
	EventTypeListenClose     EventType = 7
	EventTypeFileOpen        EventType = 8
	EventTypeTCPRetransmit   EventType = 9
	EventTypeL7Request       EventType = 10
	EventTypeFunEnt          EventType = 11
	EventTypeFunRet          EventType = 12

	EventReasonNone    EventReason = 0
	EventReasonOOMKill EventReason = 1
)

type Event struct {
	Type       EventType
	Reason     EventReason
	Pid        uint32
	SrcAddr    netaddr.IPPort
	DstAddr    netaddr.IPPort
	Fd         uint64
	Timestamp  uint64
	L7Request  *l7.RequestData
	StackEvent *StackEvent
}

type perfMapType uint8

const (
	perfMapTypeProcEvents   perfMapType = 1
	perfMapTypeTCPEvents    perfMapType = 2
	perfMapTypeFileEvents   perfMapType = 3
	perfMapTypeL7Events     perfMapType = 4
	perfMapTypeSocketEvents perfMapType = 5
	perfMapTypeEventQueue   perfMapType = 6
)

type Tracer struct {
	kernelVersion    string
	disableL7Tracing bool

	collection *ebpf.Collection
	readers    map[string]*perf.Reader
	links      []link.Link
	uprobes    map[string]*ebpf.Program
	Symbols    []debugelf.Symbol
	Uprobes    []tracer.Uprobe
	UprobesMap map[string]tracer.Uprobe
}

func NewTracer(kernelVersion string, disableL7Tracing bool) *Tracer {
	if disableL7Tracing {
		klog.Infoln("L7 tracing is disabled")
	}
	return &Tracer{
		kernelVersion:    kernelVersion,
		disableL7Tracing: disableL7Tracing,

		readers: map[string]*perf.Reader{},
		uprobes: map[string]*ebpf.Program{},
	}
}

func (t *Tracer) Run(events chan<- Event) error {
	if err := t.ebpf(events); err != nil {
		return err
	}
	if err := t.init(events); err != nil {
		return err
	}
	return nil
}

func (t *Tracer) Close() {
	for _, p := range t.uprobes {
		_ = p.Close()
	}
	for _, l := range t.links {
		_ = l.Close()
	}
	for _, r := range t.readers {
		_ = r.Close()
	}
	t.collection.Close()
}

func (t *Tracer) init(ch chan<- Event) error {
	pids, err := proc.ListPids()
	if err != nil {
		return fmt.Errorf("failed to list pids: %w", err)
	}
	for _, pid := range pids {
		ch <- Event{Type: EventTypeProcessStart, Pid: pid}
	}

	fds, sockets := readFds(pids)
	for _, fd := range fds {
		ch <- Event{Type: EventTypeFileOpen, Pid: fd.pid, Fd: fd.fd}
	}

	listens := map[uint64]bool{}
	for _, s := range sockets {
		if s.Listen {
			listens[uint64(s.pid)<<32|uint64(s.SAddr.Port())] = true
		}
	}

	for _, s := range sockets {
		typ := EventTypeConnectionOpen
		if s.Listen {
			typ = EventTypeListenOpen
		} else if listens[uint64(s.pid)<<32|uint64(s.SAddr.Port())] || s.DAddr.Port() > s.SAddr.Port() { // inbound
			continue
		}
		ch <- Event{
			Type:    typ,
			Pid:     s.pid,
			Fd:      s.fd,
			SrcAddr: s.SAddr,
			DstAddr: s.DAddr,
		}
	}
	return nil
}

type perfMap struct {
	name                  string
	perCPUBufferSizePages int
	typ                   perfMapType
}

func (t *Tracer) ebpf(ch chan<- Event) error {
	kv := "v" + common.KernelMajorMinor(t.kernelVersion)
	path, prg, err := EbpfCode(kv)
	klog.Infof("kv is %s, kernel version: %s path: %s\n", kv, t.kernelVersion, path)
	if len(prg) == 0 || err != nil {
		return fmt.Errorf("kv is %s, unsupported kernel version: %s path: %s err:<%v>", kv, t.kernelVersion, path, err)
	}
	_, debugFsErr := os.Stat("/sys/kernel/debug/tracing")
	_, traceFsErr := os.Stat("/sys/kernel/tracing")

	if debugFsErr != nil && traceFsErr != nil {
		return fmt.Errorf("kernel tracing is not available: debugfs or tracefs must be mounted")
	}

	collectionSpec, err := ebpf.LoadCollectionSpecFromReader(bytes.NewReader(prg))
	if err != nil {
		return fmt.Errorf("failed to load collection spec: %w", err)
	}
	_ = unix.Setrlimit(unix.RLIMIT_MEMLOCK, &unix.Rlimit{Cur: unix.RLIM_INFINITY, Max: unix.RLIM_INFINITY})
	tracer.PidFilter(collectionSpec)
	opts := &ebpf.CollectionOptions{MapReplacements: make(map[string]*ebpf.Map)}
	for _, spec := range collectionSpec.Maps {
		fmt.Println("maps:", spec.Name)
	}
	tracer.MapInit(collectionSpec, opts)
	// TODO 多进程
	// tracer.SetConstants(collectionSpec)
	c, err := ebpf.NewCollectionWithOptions(collectionSpec, *opts)
	if err != nil {
		var verr *ebpf.VerifierError
		if errors.As(err, &verr) {
			klog.Errorf("----%+v", verr)
		}
		return fmt.Errorf("failed to load collection: %w", err)
	}
	tracer.Offset()

	t.collection = c

	perfMaps := []perfMap{
		{name: "proc_events", typ: perfMapTypeProcEvents, perCPUBufferSizePages: 4},
		{name: "tcp_listen_events", typ: perfMapTypeTCPEvents, perCPUBufferSizePages: 4},
		{name: "tcp_connect_events", typ: perfMapTypeTCPEvents, perCPUBufferSizePages: 8},
		{name: "tcp_retransmit_events", typ: perfMapTypeTCPEvents, perCPUBufferSizePages: 4},
		{name: "file_events", typ: perfMapTypeFileEvents, perCPUBufferSizePages: 4},
		{name: "event_queue", typ: perfMapTypeEventQueue, perCPUBufferSizePages: 32},
	}
	fmt.Println(len(collectionSpec.Programs))
	fmt.Println(len(c.Programs))
	tracer.MapInsert(c)
	if !t.disableL7Tracing {
		perfMaps = append(perfMaps, perfMap{name: "l7_events", typ: perfMapTypeL7Events, perCPUBufferSizePages: 32})
	}
	perfMaps = append(perfMaps, perfMap{name: tracer.MAP_PERF_SOCKET_DATA_NAME, typ: perfMapTypeSocketEvents, perCPUBufferSizePages: 64})
	fmt.Println("perfMaps start --")
	for _, pm := range perfMaps {
		fmt.Println("pm.namepm.name: ", pm.name)
		m, ok := t.collection.Maps[pm.name]
		if ok {
			r, err := perf.NewReader(m, pm.perCPUBufferSizePages*os.Getpagesize())
			if err != nil {
				t.Close()
				return fmt.Errorf("failed to create ebpf reader: %w", err)
			}
			t.readers[pm.name] = r
			// event监听
			go runEventsReader(pm.name, r, ch, pm.typ)
		}
	}
	fmt.Println("perfMaps end --")

	for _, programSpec := range collectionSpec.Programs {
		program := t.collection.Programs[programSpec.Name]
		fmt.Println("programSpecprogramSpec:--:", programSpec.Name, programSpec.SectionName, programSpec.Type)
		if t.disableL7Tracing {
			switch programSpec.Name {
			case "sys_enter_writev", "sys_enter_write", "sys_enter_sendto", "sys_enter_sendmsg", "sys_enter_sendmmsg":
				continue
			case "sys_enter_read", "sys_enter_readv", "sys_enter_recvfrom", "sys_enter_recvmsg":
				continue
			case "sys_exit_read", "sys_exit_readv", "sys_exit_recvfrom", "sys_exit_recvmsg":
				continue
			}
		}
		var l link.Link
		switch programSpec.Type {
		case ebpf.TracePoint:
			if strings.Contains(programSpec.SectionName, "prog") {
				continue
			}
			parts := strings.SplitN(programSpec.AttachTo, "/", 2)
			l, err = link.Tracepoint(parts[0], parts[1], program, nil)
		case ebpf.Kprobe:
			if strings.HasPrefix(programSpec.SectionName, "uprobe/") {

				fmt.Println("==============uprobe s")
				fmt.Println(programSpec.Name, programSpec.SectionName, programSpec.Type)
				fmt.Println("==============uprobe e")

				t.uprobes[programSpec.Name] = program
				continue
			}
			l, err = link.Kprobe(programSpec.AttachTo, program, nil)
		}
		if err != nil {
			t.Close()
			return fmt.Errorf("failed to link program: %w", err)
		}
		t.links = append(t.links, l)
	}

	return nil
}

func (t EventType) String() string {
	switch t {
	case EventTypeProcessStart:
		return "process-start"
	case EventTypeProcessExit:
		return "process-exit"
	case EventTypeConnectionOpen:
		return "connection-open"
	case EventTypeConnectionClose:
		return "connection-close"
	case EventTypeConnectionError:
		return "connection-error"
	case EventTypeListenOpen:
		return "listen-open"
	case EventTypeListenClose:
		return "listen-close"
	case EventTypeFileOpen:
		return "file-open"
	case EventTypeTCPRetransmit:
		return "tcp-retransmit"
	case EventTypeL7Request:
		return "l7-request"
	}
	return "unknown: " + strconv.Itoa(int(t))
}

func (t EventReason) String() string {
	switch t {
	case EventReasonNone:
		return "none"
	case EventReasonOOMKill:
		return "oom-kill"
	}
	return "unknown: " + strconv.Itoa(int(t))
}

type procEvent struct {
	Type   EventType
	Pid    uint32
	Reason uint32
}

type tcpEvent struct {
	Fd        uint64
	Timestamp uint64
	Type      EventType
	Pid       uint32
	SPort     uint16
	DPort     uint16
	SAddr     [16]byte
	DAddr     [16]byte
}

type fileEvent struct {
	Type EventType
	Pid  uint32
	Fd   uint64
}

// struct l7_event in l7.c
type l7Event struct {
	Fd                  uint64
	ConnectionTimestamp uint64
	Pid                 uint32
	Status              uint32
	Duration            uint64
	Protocol            uint8
	Method              uint8
	Padding             uint16
	StatementId         uint32
	PayloadSize         uint64
	TraceId             uint64
	StartAt             uint64 // ns
	EndtAt              uint64 // ns
	TraceStart          uint32
	TraceEnd            uint32
	EventCount          uint32
	AssumedAppId        utils.HashByte
	SpanId              utils.HashByte
	TraceIdFrom         utils.HashByte16
	CalledId            utils.HashByte
	InstanceIdFrom      utils.HashByte
	AppIdFrom           utils.HashByte
	SpanIdFrom          utils.HashByte
}

type SocketDataBufferddd struct {
	EventsNum uint32
	Len       uint32
	Data      [32760]byte
}

const (
	TASK_COMM_LEN       = 16
	BURST_DATA_BUF_SIZE = 8192
)

type Tuple struct {
	Daddr      [16]uint8
	RcvSaddr   [16]uint8
	AddrLen    uint8
	L4Protocol uint8
	Dport      uint16
	Num        uint16
}

type SocketDatadddd struct {
	Pid            uint32 // 表示线程号 如果'pid == tgid'表示一个进程, 否则是线程
	Tgid           uint32 // 进程号
	CoroutineID    uint64
	Source         uint8
	Comm           [TASK_COMM_LEN]byte
	SocketID       uint64
	Tuple          Tuple
	ExtraData      uint32
	ExtraDataCount uint32
	TcpSeq         uint32
	ThreadTraceID  uint64
	Timestamp      uint64
	Direction      uint8
	MsgType        uint8
	SyscallLen     uint64
	DataSeq        uint64
	DataType       uint16
	DataLen        uint16
	Data           [BURST_DATA_BUF_SIZE]byte
}

type StackEvent struct {
	Pid         uint64
	TraceId     uint64
	Goid        uint64
	Ip          uint64
	Bp          uint64
	CallerIp    uint64
	CallerBp    uint64
	TimeNsStart uint64
	TimeNsEnd   uint64
	// Nid         uint64
	// Fpid        uint64
	// Level       uint64
	Location byte
}

type StackFunEvent struct {
	StackEvent StackEvent
	Uprobe     *tracer.Uprobe
}

func runEventsReader(name string, r *perf.Reader, ch chan<- Event, typ perfMapType) {
	for {
		rec, err := r.Read()
		if err != nil {
			if errors.Is(err, perf.ErrClosed) {
				break
			}
			continue
		}
		if rec.LostSamples > 0 {
			klog.Errorln(name, "lost samples:", rec.LostSamples)
			continue
		}
		var event Event

		switch typ {
		case perfMapTypeSocketEvents:
			//fmt.Println("perfMapTypeSocketEvents")
			// 假设 rec.RawSample 包含数据，类型为 []byte
			//rawData := rec.RawSample
			//fmt.Println("perfMapTypeSocketEvents2")
			//
			//// 创建一个 SocketDataBuffer 结构体实例
			//var buffer SocketDataBuffer
			//
			//// 创建一个字节缓冲区，并将数据填充到其中
			//reader := bytes.NewReader(rawData)
			//fmt.Println("perfMapTypeSocketEvents3")
			//fmt.Println(len(rawData))
			//// 使用 binary.Read 函数读取数据并解析为 SocketDataBuffer 结构体实例
			//if err := binary.Read(reader, binary.LittleEndian, &buffer); err != nil {
			//	fmt.Println(reader.Len())
			//	fmt.Println("Failed to read data:", err)
			//	continue
			//}
			//fmt.Println("perfMapTypeSocketEvents4")
			//
			//// 打印解析后的数据
			//fmt.Println("EventsNum:", buffer.EventsNum)
			//fmt.Println("Len:", buffer.Len)
			//
			//// 打印 char data 的内容
			//fmt.Printf("Data: %s\n", string(buffer.Data[:buffer.Len])) // 仅打印实际长度的数据

			//socketDataBuffer := rec.RawSample

			// 解析 __socket_data_buffer
			//buf := (*SocketDataBuffer)(unsafe.Pointer(&rec.RawSample[0])) //nolint:gosec
			//
			//// 获取 char data[32760];
			//socketData := (*SocketData)(unsafe.Pointer(&buf.data[0])) //nolint:gosec
			//// todo
			//fmt.Printf("socketData.DataType:%d \n", (socketData.data_type))
			//fmt.Printf("socketData.DataLen:%d \n", (socketData.data_len))
			//
			//// 解析C结构体中的data字段
			//dataSlice := C.GoBytes(unsafe.Pointer(&socketData.data[0]), C.int(socketData.data_len))
			//// 打印或处理包含的数据
			//fmt.Printf("socketData.Payload:%v \n", string(dataSlice))

			/*todo */
			//socketData := (*(*[128]byte)(unsafe.Pointer(&eventC.line)))
			//dataPtr := unsafe.Pointer(&buf.data[0])
			//socketData := (*SocketData)(dataPtr)

			//reader2 := bytes.NewBuffer(rec.RawSample)

			// 222222

			//fmt.Println("socketData.Pid:", socketData.pid)
			//fmt.Println("socketData.Tgid:", socketData.tgid)
			//fmt.Println("socketData.CoroutineID:", socketData.coroutine_id)
			//fmt.Println("socketData.Source:", socketData.source)
			//
			//fmt.Printf("socketData.Comm: %s \n", socketData.comm)
			//fmt.Printf("socketData.SocketID :%v \n", socketData.socket_id)
			//fmt.Println("socketData.Tuple:", socketData.Tuple)
			//fmt.Println("socketData.ExtraData:", socketData.ExtraData)
			//fmt.Println("socketData.ExtraDataCount:", socketData.ExtraDataCount)
			//fmt.Println("socketData.TCPSeq:", socketData.TcpSeq)
			//fmt.Println("socketData.ThreadTraceID:", socketData.ThreadTraceID)
			//fmt.Println("socketData.Timestamp:", socketData.Timestamp)
			//fmt.Println("socketData.Direction:", socketData.Direction)
			//fmt.Println("socketData.MsgType:", socketData.MsgType)
			//fmt.Println("socketData.SyscallLen:", socketData.SyscallLen)
			//fmt.Println("socketData.DataSeq:", socketData.DataSeq)

			//socketData := &SocketData{}
			//reader := bytes.NewBuffer(rec.RawSample)
			//if err := binary.Read(reader, binary.LittleEndian, v); err != nil {
			//	klog.Warningln("failed1 to read msg:", err)
			//	continue
			//}

			//
			//var data []byte
			//payload := reader.Bytes()
			//switch {
			//case v.Len == 0:
			//case v.Len > 32760:
			//	data = payload[:32760]
			//default:
			//	data = payload[:v.Len]
			//}
			//////data2 := data[:v.Len]
			////fmt.Println("perfMapTypeSocketEvents")
			//fmt.Println(v.EventsNum)
			//fmt.Println(v.Len)
			//fmt.Println(string(data))
			//
			//var data2 SocketData
			//reader2 := bytes.NewBuffer(data)
			//if err := binary.Read(reader2, binary.LittleEndian, data2); err != nil {
			//	klog.Warningln("failed2 to read msg:", err)
			//	continue
			//}
			//
			//fmt.Println(data2.Pid)
			//fmt.Println(data2.Tgid)

			//fmt.Println(string(v.Data))
			//continue
		case perfMapTypeL7Events:
			v := &l7Event{}
			reader := bytes.NewBuffer(rec.RawSample)
			if err := binary.Read(reader, binary.LittleEndian, v); err != nil {
				klog.Warningln("failed to read msg:", err)
				continue
			}
			//fmt.Println("v.TraceIdFrom")
			//fmt.Println(v.TraceIdFrom)
			//a := hex.EncodeToString(v.TraceIdFrom[:])
			//for _, b := range v.AssumedAppId {
			//	fmt.Printf("v.AssumedAppId- %02\n", b)
			//}
			//fmt.Println(a)

			payload := reader.Bytes()
			req := &l7.RequestData{
				Protocol:     l7.Protocol(v.Protocol),
				Status:       l7.Status(v.Status),
				Duration:     time.Duration(v.Duration),
				Method:       l7.Method(v.Method),
				StatementId:  v.StatementId,
				TraceId:      v.TraceId,
				TraceStart:   v.TraceStart,
				TraceEnd:     v.TraceEnd,
				EventCount:   v.EventCount,
				AssumedAppId: hex.EncodeToString(v.AssumedAppId[:]),
				SpanId:       hex.EncodeToString(v.SpanId[:]),
				StartAt:      v.StartAt,
				EndAt:        v.EndtAt,
			}
			if v.TraceEnd == 1 {
				req.ParentSpanContext.TraceIdFrom = hex.EncodeToString(v.TraceIdFrom[:])
				req.ParentSpanContext.CalledId = hex.EncodeToString(v.CalledId[:])
				req.ParentSpanContext.InstanceIdFrom = hex.EncodeToString(v.InstanceIdFrom[:])
				req.ParentSpanContext.AppIdFrom = hex.EncodeToString(v.AppIdFrom[:])
				req.ParentSpanContext.SpanIdFrom = hex.EncodeToString(v.SpanIdFrom[:])
			}
			switch {
			case v.PayloadSize == 0:
			case v.PayloadSize > MaxPayloadSize:
				req.Payload = payload[:MaxPayloadSize]
			default:
				req.Payload = payload[:v.PayloadSize]
			}
			//fmt.Println("==========")
			//fmt.Println("req.Payload:", string(req.Payload))
			//fmt.Println("==========")
			event = Event{Type: EventTypeL7Request, Pid: v.Pid, Fd: v.Fd, Timestamp: v.ConnectionTimestamp, L7Request: req}
		case perfMapTypeFileEvents:
			v := &fileEvent{}
			if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
				klog.Warningln("failed to read msg:", err)
				continue
			}
			event = Event{Type: v.Type, Pid: v.Pid, Fd: v.Fd}
		case perfMapTypeProcEvents:
			v := &procEvent{}
			if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
				klog.Warningln("failed to read msg:", err)
				continue
			}
			event = Event{Type: v.Type, Reason: EventReason(v.Reason), Pid: v.Pid}
		case perfMapTypeTCPEvents:
			v := &tcpEvent{}
			if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
				klog.Warningln("failed to read msg:", err)
				continue
			}
			event = Event{
				Type:      v.Type,
				Pid:       v.Pid,
				SrcAddr:   ipPort(v.SAddr, v.SPort),
				DstAddr:   ipPort(v.DAddr, v.DPort),
				Fd:        v.Fd,
				Timestamp: v.Timestamp,
			}
		case perfMapTypeEventQueue:
			v := &StackEvent{}
			if err := binary.Read(bytes.NewBuffer(rec.RawSample), binary.LittleEndian, v); err != nil {
				klog.Warningln("failed to read msg:", err)
				continue
			}

			event = Event{
				Type:       EventTypeFunEnt,
				StackEvent: v,
			}
		default:
			continue
		}

		ch <- event
	}
}

func ipPort(ip [16]byte, port uint16) netaddr.IPPort {
	i, _ := netaddr.FromStdIP(ip[:])
	return netaddr.IPPortFrom(i, port)
}

func (t *Tracer) InitKProcInfo(pid uint32, insID utils.ID, codeType uint16) error {

	info := tracer.EbpfProcInfo{}
	info.InstanceId = insID.HashtVal
	// 获取内存地址
	allocDetails, err := tracer.Allocate(int(pid))
	if err == nil && allocDetails != nil {
		info.StartAddr = allocDetails.StartAddr
		info.EndAddr = allocDetails.EndAddr
	}

	info.CodeType = codeType
	//klog.Infoln("Major:", major)
	//klog.Infoln("Minor:", minor)
	//klog.Infoln("Revision:", revision)
	//klog.Infoln("goVersion", goVersion)
	//klog.Infoln("info.StartAddr", info.StartAddr)
	//klog.Infoln("info.EndAddr", info.EndAddr)
	_, err = tracer.UpdateProcInfoToMap(t.collection, pid, info)
	if err != nil {
		klog.Error("failed to update program info", err)
	}
	return err
}