1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (c) 2021 Hengqi Chen */
3
4 #include "vmlinux.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_tracing.h>
7 #include "bpf_tracing_net.h"
8
9 const volatile pid_t my_pid = 0;
10 char path[256] = {};
11
12 SEC("fentry/unix_listen")
13 int BPF_PROG(unix_listen, struct socket *sock, int backlog)
14 {
15 pid_t pid = bpf_get_current_pid_tgid() >> 32;
16 struct unix_sock *unix_sk;
17 int i, len;
18
19 if (pid != my_pid)
20 return 0;
21
22 unix_sk = (struct unix_sock *)bpf_skc_to_unix_sock(sock->sk);
23 if (!unix_sk)
24 return 0;
25
26 if (unix_sk->addr->name->sun_path[0])
27 return 0;
28
29 len = unix_sk->addr->len - sizeof(short);
30 path[0] = '@';
31 for (i = 1; i < len; i++) {
32 if (i >= (int)sizeof(struct sockaddr_un))
33 break;
34
35 path[i] = unix_sk->addr->name->sun_path[i];
36 }
37 return 0;
38 }
39
40 char _license[] SEC("license") = "GPL";
41
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.