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