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