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
|
package tracepoints
import (
"fmt"
"log"
"os"
"regexp"
"strings"
bpf "github.com/aquasecurity/libbpfgo"
)
// SEC("tracepoint/syscalls/sys_exit_openat")
var syscallRe = regexp.MustCompile(`sys_((enter|exit).*)"\)`)
func filterLines(lines []string) ([]string, error) {
var syscalls []string
for _, line := range lines {
matches := syscallRe.FindStringSubmatch(line)
if len(matches) < 1 {
continue
}
syscalls = append(syscalls, matches[1])
}
return syscalls, nil
}
// Filter out all used syscall tracepoints from *.bpf.c
func usedSyscalls() ([]string, error) {
var syscalls []string
files, err := os.ReadDir(".")
if err != nil {
return syscalls, err
}
for _, file := range files {
fileName := file.Name()
if !strings.HasSuffix(fileName, ".bpf.c") {
continue
}
content, err := os.ReadFile(fileName)
if err != nil {
return syscalls, err
}
syscalls_, err := filterLines(strings.Split(string(content), "\n"))
if err != nil {
return syscalls, err
}
syscalls = append(syscalls, syscalls_...)
}
return syscalls, nil
}
func AttachSyscalls(bpfModule *bpf.Module) error {
syscalls, err := usedSyscalls()
if err != nil {
return err
}
for _, name := range syscalls {
// Attach to tracepoint
prog, err := bpfModule.GetProgram(fmt.Sprintf("handle_%s", name))
if err != nil {
return fmt.Errorf("Failed to get BPF program handle_%s: %v", name, err)
}
log.Println("Attached prog handle_" + name)
if _, err = prog.AttachTracepoint("syscalls", fmt.Sprintf("sys_%s", name)); err != nil {
return fmt.Errorf("Failed to attach to sys_%s tracepoint: %v", name, err)
}
log.Println("Attached tracepoint sys_" + name)
}
return nil
}
|
