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package netlink
import (
"bytes"
"encoding/binary"
"fmt"
"os"
"syscall"
"github.com/vishvananda/netlink/nl"
"github.com/vishvananda/netns"
"golang.org/x/sys/unix"
)
const CN_IDX_PROC = 0x1
const (
PROC_EVENT_NONE = 0x00000000
PROC_EVENT_FORK = 0x00000001
PROC_EVENT_EXEC = 0x00000002
PROC_EVENT_UID = 0x00000004
PROC_EVENT_GID = 0x00000040
PROC_EVENT_SID = 0x00000080
PROC_EVENT_PTRACE = 0x00000100
PROC_EVENT_COMM = 0x00000200
PROC_EVENT_COREDUMP = 0x40000000
PROC_EVENT_EXIT = 0x80000000
)
const (
CN_VAL_PROC = 0x1
PROC_CN_MCAST_LISTEN = 0x1
)
type ProcEventMsg interface {
Pid() uint32
Tgid() uint32
}
type ProcEventHeader struct {
What uint32
CPU uint32
Timestamp uint64
}
type ProcEvent struct {
ProcEventHeader
Msg ProcEventMsg
}
func (pe *ProcEvent) setHeader(h ProcEventHeader) {
pe.What = h.What
pe.CPU = h.CPU
pe.Timestamp = h.Timestamp
}
type ExitProcEvent struct {
ProcessPid uint32
ProcessTgid uint32
ExitCode uint32
ExitSignal uint32
ParentPid uint32
ParentTgid uint32
}
func (e *ExitProcEvent) Pid() uint32 {
return e.ProcessPid
}
func (e *ExitProcEvent) Tgid() uint32 {
return e.ProcessTgid
}
type ExecProcEvent struct {
ProcessPid uint32
ProcessTgid uint32
}
func (e *ExecProcEvent) Pid() uint32 {
return e.ProcessPid
}
func (e *ExecProcEvent) Tgid() uint32 {
return e.ProcessTgid
}
type ForkProcEvent struct {
ParentPid uint32
ParentTgid uint32
ChildPid uint32
ChildTgid uint32
}
func (e *ForkProcEvent) Pid() uint32 {
return e.ParentPid
}
func (e *ForkProcEvent) Tgid() uint32 {
return e.ParentTgid
}
type CommProcEvent struct {
ProcessPid uint32
ProcessTgid uint32
Comm [16]byte
}
func (e *CommProcEvent) Pid() uint32 {
return e.ProcessPid
}
func (e *CommProcEvent) Tgid() uint32 {
return e.ProcessTgid
}
func ProcEventMonitor(ch chan<- ProcEvent, done <-chan struct{}, errorChan chan<- error) error {
h, err := NewHandle()
if err != nil {
return err
}
defer h.Delete()
s, err := nl.SubscribeAt(netns.None(), netns.None(), unix.NETLINK_CONNECTOR, CN_IDX_PROC)
if err != nil {
return err
}
var nlmsg nl.NetlinkRequest
nlmsg.Pid = uint32(os.Getpid())
nlmsg.Type = unix.NLMSG_DONE
nlmsg.Len = uint32(unix.SizeofNlMsghdr)
cm := nl.NewCnMsg(CN_IDX_PROC, CN_VAL_PROC, PROC_CN_MCAST_LISTEN)
nlmsg.AddData(cm)
s.Send(&nlmsg)
if done != nil {
go func() {
<-done
s.Close()
}()
}
go func() {
defer close(ch)
for {
msgs, from, err := s.Receive()
if err != nil {
errorChan <- err
return
}
if from.Pid != nl.PidKernel {
errorChan <- fmt.Errorf("Wrong sender portid %d, expected %d", from.Pid, nl.PidKernel)
return
}
for _, m := range msgs {
e := parseNetlinkMessage(m)
if e != nil {
ch <- *e
}
}
}
}()
return nil
}
func parseNetlinkMessage(m syscall.NetlinkMessage) *ProcEvent {
if m.Header.Type == unix.NLMSG_DONE {
buf := bytes.NewBuffer(m.Data)
msg := &nl.CnMsg{}
hdr := &ProcEventHeader{}
binary.Read(buf, nl.NativeEndian(), msg)
binary.Read(buf, nl.NativeEndian(), hdr)
pe := &ProcEvent{}
pe.setHeader(*hdr)
switch hdr.What {
case PROC_EVENT_EXIT:
event := &ExitProcEvent{}
binary.Read(buf, nl.NativeEndian(), event)
pe.Msg = event
return pe
case PROC_EVENT_FORK:
event := &ForkProcEvent{}
binary.Read(buf, nl.NativeEndian(), event)
pe.Msg = event
return pe
case PROC_EVENT_EXEC:
event := &ExecProcEvent{}
binary.Read(buf, nl.NativeEndian(), event)
pe.Msg = event
return pe
case PROC_EVENT_COMM:
event := &CommProcEvent{}
binary.Read(buf, nl.NativeEndian(), event)
pe.Msg = event
return pe
}
return nil
}
return nil
}
|
