1 // SPDX-License-Identifier: GPL-2.0
2 #include <test_progs.h>
3
test_probe_user(void)4 void test_probe_user(void)
5 {
6 #define kprobe_name "__sys_connect"
7 const char *prog_name = "kprobe/" kprobe_name;
8 const char *obj_file = "./test_probe_user.o";
9 DECLARE_LIBBPF_OPTS(bpf_object_open_opts, opts, );
10 int err, results_map_fd, sock_fd, duration = 0;
11 struct sockaddr curr, orig, tmp;
12 struct sockaddr_in *in = (struct sockaddr_in *)&curr;
13 struct bpf_link *kprobe_link = NULL;
14 struct bpf_program *kprobe_prog;
15 struct bpf_object *obj;
16 static const int zero = 0;
17
18 obj = bpf_object__open_file(obj_file, &opts);
19 if (CHECK(IS_ERR(obj), "obj_open_file", "err %ld\n", PTR_ERR(obj)))
20 return;
21
22 kprobe_prog = bpf_object__find_program_by_title(obj, prog_name);
23 if (CHECK(!kprobe_prog, "find_probe",
24 "prog '%s' not found\n", prog_name))
25 goto cleanup;
26
27 err = bpf_object__load(obj);
28 if (CHECK(err, "obj_load", "err %d\n", err))
29 goto cleanup;
30
31 results_map_fd = bpf_find_map(__func__, obj, "test_pro.bss");
32 if (CHECK(results_map_fd < 0, "find_bss_map",
33 "err %d\n", results_map_fd))
34 goto cleanup;
35
36 kprobe_link = bpf_program__attach_kprobe(kprobe_prog, false,
37 kprobe_name);
38 if (CHECK(IS_ERR(kprobe_link), "attach_kprobe",
39 "err %ld\n", PTR_ERR(kprobe_link))) {
40 kprobe_link = NULL;
41 goto cleanup;
42 }
43
44 memset(&curr, 0, sizeof(curr));
45 in->sin_family = AF_INET;
46 in->sin_port = htons(5555);
47 in->sin_addr.s_addr = inet_addr("255.255.255.255");
48 memcpy(&orig, &curr, sizeof(curr));
49
50 sock_fd = socket(AF_INET, SOCK_STREAM, 0);
51 if (CHECK(sock_fd < 0, "create_sock_fd", "err %d\n", sock_fd))
52 goto cleanup;
53
54 connect(sock_fd, &curr, sizeof(curr));
55 close(sock_fd);
56
57 err = bpf_map_lookup_elem(results_map_fd, &zero, &tmp);
58 if (CHECK(err, "get_kprobe_res",
59 "failed to get kprobe res: %d\n", err))
60 goto cleanup;
61
62 in = (struct sockaddr_in *)&tmp;
63 if (CHECK(memcmp(&tmp, &orig, sizeof(orig)), "check_kprobe_res",
64 "wrong kprobe res from probe read: %s:%u\n",
65 inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
66 goto cleanup;
67
68 memset(&tmp, 0xab, sizeof(tmp));
69
70 in = (struct sockaddr_in *)&curr;
71 if (CHECK(memcmp(&curr, &tmp, sizeof(tmp)), "check_kprobe_res",
72 "wrong kprobe res from probe write: %s:%u\n",
73 inet_ntoa(in->sin_addr), ntohs(in->sin_port)))
74 goto cleanup;
75 cleanup:
76 bpf_link__destroy(kprobe_link);
77 bpf_object__close(obj);
78 }
79