| 1 | |
| 2 | #include <stdio.h>
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| 3 | #include <unistd.h>
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| 4 | #include <string.h>
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| 5 | #include <assert.h>
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| 6 | #include <bpf/libbpf.h>
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| 7 | #include <bpf/bpf.h>
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| 8 | #include "trace_helpers.h"
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| 9 |
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| 10 | int main(int ac, char **argv)
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| 11 | {
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| 12 | struct bpf_object *obj = NULL;
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| 13 | struct bpf_link *links[20];
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| 14 | long key, next_key, value;
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| 15 | struct bpf_program *prog;
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| 16 | int map_fd, i, j = 0;
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| 17 | char filename[256];
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| 18 | struct ksym *sym;
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| 19 |
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| 20 | if (load_kallsyms()) {
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| 21 | printf("failed to process /proc/kallsyms\n");
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| 22 | return 2;
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| 23 | }
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| 24 |
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| 25 | snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
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| 26 | obj = bpf_object__open_file(filename, NULL);
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| 27 | if (libbpf_get_error(obj)) {
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| 28 | fprintf(stderr, "ERROR: opening BPF object file failed\n");
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| 29 | obj = NULL;
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| 30 | goto cleanup;
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| 31 | }
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| 32 |
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| 33 |
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| 34 | if (bpf_object__load(obj)) {
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| 35 | fprintf(stderr, "ERROR: loading BPF object file failed\n");
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| 36 | goto cleanup;
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| 37 | }
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| 38 |
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| 39 | map_fd = bpf_object__find_map_fd_by_name(obj, "my_map");
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| 40 | if (map_fd < 0) {
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| 41 | fprintf(stderr, "ERROR: finding a map in obj file failed\n");
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| 42 | goto cleanup;
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| 43 | }
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| 44 |
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| 45 | bpf_object__for_each_program(prog, obj) {
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| 46 | links[j] = bpf_program__attach(prog);
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| 47 | if (libbpf_get_error(links[j])) {
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| 48 | fprintf(stderr, "bpf_program__attach failed\n");
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| 49 | links[j] = NULL;
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| 50 | goto cleanup;
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| 51 | }
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| 52 | j++;
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| 53 | }
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| 54 |
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| 55 | for (i = 0; i < 5; i++) {
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| 56 | key = 0;
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| 57 | printf("kprobing funcs:");
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| 58 | while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0) {
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| 59 | bpf_map_lookup_elem(map_fd, &next_key, &value);
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| 60 | assert(next_key == value);
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| 61 | sym = ksym_search(value);
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| 62 | key = next_key;
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| 63 | if (!sym) {
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| 64 | printf("ksym not found. Is kallsyms loaded?\n");
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| 65 | continue;
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| 66 | }
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| 67 |
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| 68 | printf(" %s", sym->name);
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| 69 | }
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| 70 | if (key)
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| 71 | printf("\n");
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| 72 | key = 0;
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| 73 | while (bpf_map_get_next_key(map_fd, &key, &next_key) == 0)
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| 74 | bpf_map_delete_elem(map_fd, &next_key);
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| 75 | sleep(1);
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| 76 | }
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| 77 |
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| 78 | cleanup:
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| 79 | for (j--; j >= 0; j--)
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| 80 | bpf_link__destroy(links[j]);
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| 81 |
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| 82 | bpf_object__close(obj);
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| 83 | return 0;
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| 84 | }
|