-
Notifications
You must be signed in to change notification settings - Fork 5
/
netlink.go
392 lines (356 loc) · 9.31 KB
/
netlink.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
package Netlink
import (
"bytes"
"encoding/binary"
"errors"
"io/ioutil"
"strconv"
"sync"
"syscall"
"github.com/linuxdeepin/go-lib/dbusutil"
"github.com/linuxdeepin/go-lib/log"
)
// #include <linux/connector.h>
// #include <linux/cn_proc.h>
import "C"
var logger *log.Logger
// proc message
type ProcMessage struct {
ExecPath string // exe path
Cgroup2Path string // mark cgroup v2 path
Pid string // Pid
PPid string // ppid
}
// Manager all procs
type ProcManager struct {
// current all proc
Procs map[string]ProcMessage
// lock
lock sync.Mutex
service *dbusutil.Service
// net_link module
sock int
lAddr syscall.Sockaddr
kAddr syscall.Sockaddr
//methods *struct {
// ChangeCGroup func() `in:"pid,cgroup" out:"err"`
//}
// signals
signals *struct {
ExecProc struct {
ExecPath string // exe path
CGroupPath string // mark cgroup v2 path
Pid string // Pid
PPid string
}
ExitProc struct {
ExecPath string // exe path
CGroupPath string // mark cgroup v2 path
Pid string // Pid
PPid string
}
}
}
func NewProcManager(service *dbusutil.Service) *ProcManager {
return &ProcManager{
service: service,
Procs: make(map[string]ProcMessage),
}
}
func (p *ProcManager) GetInterfaceName() string {
return BusInterface
}
//// change cgroup
//func (p *ProcManager) ChangeCGroup(pid string, cgroup string) *dbus.Error {
// logger.Debugf("start to attach pid [%s] to cgroup [%s]", pid, cgroup)
// // check if pid is num
// if !com.IsPid(pid) {
// logger.Warning("change cgroup pid is not num")
// return dbusutil.ToError(errors.New("pid is not num"))
// }
// // try to get proc message
// msg := p.getProc(pid)
// if msg == nil {
// logger.Warningf("pid [%s] not exist or has no exe path", pid)
// return dbusutil.ToError(fmt.Errorf("pid [%s] not exist or has no exe path", pid))
// }
// err := AttachCGroup(pid, cgroup)
// if err != nil {
// logger.Warningf("attach pid [%s] to cgroup [%s] failed, err: %v", pid, cgroup, err)
// }
// logger.Debugf("attach pid [%s] to cgroup [%s] success", pid, cgroup)
// return nil
//}
// init sock
func (p *ProcManager) initSock() error {
var err error
// create sock
p.sock, err = syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_DGRAM, syscall.NETLINK_CONNECTOR)
if err != nil {
logger.Warningf("create netlink connector failed, err: %v", err)
return err
}
// init local addr
p.lAddr = &syscall.SockaddrNetlink{
Family: syscall.AF_NETLINK,
Pid: autoPid,
Groups: C.CN_IDX_PROC,
}
// init kernel addr
p.kAddr = &syscall.SockaddrNetlink{
Family: syscall.AF_NETLINK,
Pid: 0,
Groups: C.CN_IDX_PROC,
}
// bind sock
err = syscall.Bind(p.sock, p.lAddr)
if err != nil {
logger.Warningf("bind netlink failed, err: %v", err)
return err
}
logger.Debug("init sock success")
return nil
}
func (p *ProcManager) sendMsg(proto uint32) error {
// message header
cnMsg := CnMsg{
Id: CbId{
Idx: C.CN_IDX_PROC,
Val: C.CN_VAL_PROC,
},
Ack: 0,
Seq: 1,
Len: uint16(binary.Size(proto)),
}
// msgHdr
nlMsg := syscall.NlMsghdr{
Len: syscall.NLMSG_HDRLEN + uint32(binary.Size(cnMsg)+binary.Size(proto)),
Type: uint16(syscall.NLMSG_DONE),
Flags: 0,
Seq: 1,
Pid: uint32(syscall.Getpid()),
}
// write nlMsg
buf := bytes.NewBuffer(make([]byte, 0, nlMsg.Len))
err := binary.Write(buf, binary.LittleEndian, nlMsg)
if err != nil {
logger.Warningf("write nlMsg failed, err: %v", err)
return err
}
// write cnMsg
err = binary.Write(buf, binary.LittleEndian, cnMsg)
if err != nil {
logger.Warningf("write cnMsg failed, err: %v", err)
return err
}
// write proto
err = binary.Write(buf, binary.LittleEndian, proto)
if err != nil {
logger.Warningf("write proto failed, err: %v", err)
return err
}
err = syscall.Sendmsg(p.sock, buf.Bytes(), nil, p.kAddr, 0)
if err != nil {
logger.Warningf("send message failed, err: %v", err)
return err
}
logger.Debugf("send message to kernel success, proto: %v", proto)
return nil
}
// load process in /proc
func (p *ProcManager) loadProc() error {
// read all process from /proc
dirsInfo, err := ioutil.ReadDir(ProcDir)
if err != nil {
logger.Warningf("read [%s] failed, err: %v", ProcDir, err)
return err
}
// select proc Pid from /proc
for _, info := range dirsInfo {
// get proc message
msg, err := getProcMsg(info.Name())
if err != nil {
logger.Debugf("get Pid message failed, err: %v", err)
continue
}
// store process message
p.addProc(info.Name(), msg)
}
return nil
}
func (p *ProcManager) listen() error {
buf := make([]byte, 1024)
// recv message from kernel
nLen, _, _, _, err := syscall.Recvmsg(p.sock, buf, nil, 0)
if err != nil {
logger.Warningf("recv message from kernel failed, err: %v", err)
return err
}
logger.Debug("success recv message from kernel")
// check length
if nLen < syscall.NLMSG_HDRLEN {
logger.Warning("recv message length is less than hdr len")
return errors.New("recv message length is less than hdr len")
}
// parse netlink message
nlMsgSlice, err := syscall.ParseNetlinkMessage(buf[:nLen])
if err != nil {
logger.Warningf("parse netlink message failed, err: %v", err)
return err
}
logger.Debug("parse netlink message success")
// parse message
for _, nlMsg := range nlMsgSlice {
msg := &CnMsg{}
header := &ProcEventHeader{}
bytBuf := bytes.NewBuffer(nlMsg.Data)
// read binary message
err = binary.Read(bytBuf, binary.LittleEndian, msg)
if err != nil {
logger.Warningf("binary read CnMsg failed, err: %v", err)
continue
}
err = binary.Read(bytBuf, binary.LittleEndian, header)
if err != nil {
logger.Warningf("binary read ProcEventHeader failed, err: %v", err)
continue
}
switch header.What {
// proc exec
case C.PROC_EVENT_EXEC:
logger.Debugf("recv message is proc exec, id: %v", C.PROC_EVENT_EXEC)
event := &ExecProcEvent{}
err = binary.Read(bytBuf, binary.LittleEndian, event)
if err != nil {
logger.Warningf("binary read ProcEventHeader failed, err: %v", err)
continue
}
// Pid equal Tgid means new proc is exec
if event.ProcPid == event.ProcTGid {
pid := strconv.Itoa(int(event.ProcPid))
msg, err := getProcMsg(pid)
if err != nil {
logger.Debugf("Pid [%s] dont include exec path", pid)
continue
}
logger.Debugf("add proc exec, Pid [%s] exe [%s]", pid, msg.ExecPath)
p.addProc(pid, msg)
}
// proc exit
case C.PROC_EVENT_EXIT:
logger.Debugf("recv message is proc exit,id :%v", C.PROC_EVENT_EXIT)
event := &ExitProcEvent{}
err = binary.Read(bytBuf, binary.LittleEndian, event)
if err != nil {
logger.Warningf("binary read ProcEventHeader failed, err: %v", err)
continue
}
// Pid equal Tgid means new proc is exec,
// when exit, this is exactly right, when pthread_cancel or pthread_exit is called in main thread,
// this result is not correct, but seldom program in this way
if event.ProcessPid == event.ProcessTgid {
pid := strconv.Itoa(int(event.ProcessPid))
logger.Debugf("del proc exec, Pid [%s]", pid)
p.delProc(pid)
}
case C.PROC_EVENT_COMM:
logger.Debugf("recv message is proc comm,id :%v", C.PROC_EVENT_COMM)
event := &CommEvent{}
err = binary.Read(bytBuf, binary.LittleEndian, event)
if err != nil {
logger.Warningf("comm event err: %v", err)
continue
}
default:
logger.Debugf("recv message is proc: %v", header.What)
continue
}
}
return nil
}
// add proc
func (p *ProcManager) addProc(pid string, msg ProcMessage) {
p.lock.Lock()
p.Procs[pid] = msg
p.lock.Unlock()
logger.Debugf("current exec proc %v", msg)
err := p.service.Emit(p, "ExecProc", msg.ExecPath, msg.Cgroup2Path, msg.Pid, msg.PPid)
if err != nil {
logger.Warningf("emit %v ExecProc failed, err: %v", msg, err)
return
}
}
// get proc
func (p *ProcManager) getProc(pid string) *ProcMessage {
p.lock.Lock()
msg := p.Procs[pid]
p.lock.Unlock()
return &msg
}
// del proc
func (p *ProcManager) delProc(pid string) {
p.lock.Lock()
msg, ok := p.Procs[pid]
delete(p.Procs, pid)
p.lock.Unlock()
if ok {
logger.Debugf("current exit proc %v", msg)
err := p.service.Emit(p, "ExitProc", msg.ExecPath, msg.Cgroup2Path, msg.Pid, msg.PPid)
if err != nil {
logger.Warningf("emit %v ExitProc failed, err: %v", msg, err)
return
}
}
}
func CreateProcsService() error {
// get system bus
service, err := dbusutil.NewSystemService()
if err != nil {
logger.Warningf("get system bus failed, err: %v", err)
return err
}
manager := NewProcManager(service)
// init sock
err = manager.initSock()
if err != nil {
logger.Warningf("init sock failed, err: %v", err)
return err
}
// send listen
err = manager.sendMsg(C.PROC_CN_MCAST_LISTEN)
if err != nil {
return err
}
// close listen when exist
defer func() {
err = manager.sendMsg(C.PROC_CN_MCAST_IGNORE)
}()
// export bus path
err = service.Export(BusPath, manager)
if err != nil {
logger.Warningf("export [%] failed, err: %v", BusPath, err)
return err
}
// continue listen
go func() {
for {
err = manager.listen()
}
}()
err = manager.loadProc()
if err != nil {
logger.Warning(err)
}
// request service
err = service.RequestName(BusServiceName)
if err != nil {
logger.Warningf("request [%s] failed, err: %v", BusServiceName, err)
return err
}
service.Wait()
return nil
}
func init() {
logger = log.NewLogger("system/proc")
logger.SetLogLevel(log.LevelDebug)
}