1
2
3
4#include <ctype.h>
5#include <errno.h>
6#include <getopt.h>
7#include <linux/bpf.h>
8#include <stdio.h>
9#include <stdlib.h>
10#include <string.h>
11
12#include <bpf/bpf.h>
13#include <bpf/libbpf.h>
14#include <bpf/btf.h>
15
16#include "main.h"
17
18#define BATCH_LINE_LEN_MAX 65536
19#define BATCH_ARG_NB_MAX 4096
20
21const char *bin_name;
22static int last_argc;
23static char **last_argv;
24static int (*last_do_help)(int argc, char **argv);
25json_writer_t *json_wtr;
26bool pretty_output;
27bool json_output;
28bool show_pinned;
29bool block_mount;
30bool verifier_logs;
31bool relaxed_maps;
32bool use_loader;
33struct btf *base_btf;
34struct pinned_obj_table prog_table;
35struct pinned_obj_table map_table;
36struct pinned_obj_table link_table;
37struct obj_refs_table refs_table;
38
39static void __noreturn clean_and_exit(int i)
40{
41 if (json_output)
42 jsonw_destroy(&json_wtr);
43
44 exit(i);
45}
46
47void usage(void)
48{
49 last_do_help(last_argc - 1, last_argv + 1);
50
51 clean_and_exit(-1);
52}
53
54static int do_help(int argc, char **argv)
55{
56 if (json_output) {
57 jsonw_null(json_wtr);
58 return 0;
59 }
60
61 fprintf(stderr,
62 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
63 " %s batch file FILE\n"
64 " %s version\n"
65 "\n"
66 " OBJECT := { prog | map | link | cgroup | perf | net | feature | btf | gen | struct_ops | iter }\n"
67 " " HELP_SPEC_OPTIONS "\n"
68 "",
69 bin_name, bin_name, bin_name);
70
71 return 0;
72}
73
74static int do_version(int argc, char **argv)
75{
76#ifdef HAVE_LIBBFD_SUPPORT
77 const bool has_libbfd = true;
78#else
79 const bool has_libbfd = false;
80#endif
81#ifdef BPFTOOL_WITHOUT_SKELETONS
82 const bool has_skeletons = false;
83#else
84 const bool has_skeletons = true;
85#endif
86
87 if (json_output) {
88 jsonw_start_object(json_wtr);
89
90 jsonw_name(json_wtr, "version");
91 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION);
92
93 jsonw_name(json_wtr, "features");
94 jsonw_start_object(json_wtr);
95 jsonw_bool_field(json_wtr, "libbfd", has_libbfd);
96 jsonw_bool_field(json_wtr, "skeletons", has_skeletons);
97 jsonw_end_object(json_wtr);
98
99 jsonw_end_object(json_wtr);
100 } else {
101 unsigned int nb_features = 0;
102
103 printf("%s v%s\n", bin_name, BPFTOOL_VERSION);
104 printf("features:");
105 if (has_libbfd) {
106 printf(" libbfd");
107 nb_features++;
108 }
109 if (has_skeletons)
110 printf("%s skeletons", nb_features++ ? "," : "");
111 printf("\n");
112 }
113 return 0;
114}
115
116int cmd_select(const struct cmd *cmds, int argc, char **argv,
117 int (*help)(int argc, char **argv))
118{
119 unsigned int i;
120
121 last_argc = argc;
122 last_argv = argv;
123 last_do_help = help;
124
125 if (argc < 1 && cmds[0].func)
126 return cmds[0].func(argc, argv);
127
128 for (i = 0; cmds[i].cmd; i++) {
129 if (is_prefix(*argv, cmds[i].cmd)) {
130 if (!cmds[i].func) {
131 p_err("command '%s' is not supported in bootstrap mode",
132 cmds[i].cmd);
133 return -1;
134 }
135 return cmds[i].func(argc - 1, argv + 1);
136 }
137 }
138
139 help(argc - 1, argv + 1);
140
141 return -1;
142}
143
144bool is_prefix(const char *pfx, const char *str)
145{
146 if (!pfx)
147 return false;
148 if (strlen(str) < strlen(pfx))
149 return false;
150
151 return !memcmp(str, pfx, strlen(pfx));
152}
153
154
155int detect_common_prefix(const char *arg, ...)
156{
157 unsigned int count = 0;
158 const char *ref;
159 char msg[256];
160 va_list ap;
161
162 snprintf(msg, sizeof(msg), "ambiguous prefix: '%s' could be '", arg);
163 va_start(ap, arg);
164 while ((ref = va_arg(ap, const char *))) {
165 if (!is_prefix(arg, ref))
166 continue;
167 count++;
168 if (count > 1)
169 strncat(msg, "' or '", sizeof(msg) - strlen(msg) - 1);
170 strncat(msg, ref, sizeof(msg) - strlen(msg) - 1);
171 }
172 va_end(ap);
173 strncat(msg, "'", sizeof(msg) - strlen(msg) - 1);
174
175 if (count >= 2) {
176 p_err("%s", msg);
177 return -1;
178 }
179
180 return 0;
181}
182
183void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
184{
185 unsigned char *data = arg;
186 unsigned int i;
187
188 for (i = 0; i < n; i++) {
189 const char *pfx = "";
190
191 if (!i)
192 ;
193 else if (!(i % 16))
194 fprintf(f, "\n");
195 else if (!(i % 8))
196 fprintf(f, " ");
197 else
198 pfx = sep;
199
200 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
201 }
202}
203
204
205static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb)
206{
207 static const char ws[] = " \t\r\n";
208 char *cp = line;
209 int n_argc = 0;
210
211 while (*cp) {
212
213 cp += strspn(cp, ws);
214
215 if (*cp == '\0')
216 break;
217
218 if (n_argc >= (maxargs - 1)) {
219 p_err("too many arguments to command %d", cmd_nb);
220 return -1;
221 }
222
223
224 if (*cp == '\'' || *cp == '"') {
225 char quote = *cp++;
226
227 n_argv[n_argc++] = cp;
228
229 cp = strchr(cp, quote);
230 if (!cp) {
231 p_err("unterminated quoted string in command %d",
232 cmd_nb);
233 return -1;
234 }
235 } else {
236 n_argv[n_argc++] = cp;
237
238
239 cp += strcspn(cp, ws);
240 if (*cp == '\0')
241 break;
242 }
243
244
245 *cp++ = 0;
246 }
247 n_argv[n_argc] = NULL;
248
249 return n_argc;
250}
251
252static int do_batch(int argc, char **argv);
253
254static const struct cmd cmds[] = {
255 { "help", do_help },
256 { "batch", do_batch },
257 { "prog", do_prog },
258 { "map", do_map },
259 { "link", do_link },
260 { "cgroup", do_cgroup },
261 { "perf", do_perf },
262 { "net", do_net },
263 { "feature", do_feature },
264 { "btf", do_btf },
265 { "gen", do_gen },
266 { "struct_ops", do_struct_ops },
267 { "iter", do_iter },
268 { "version", do_version },
269 { 0 }
270};
271
272static int do_batch(int argc, char **argv)
273{
274 char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
275 char *n_argv[BATCH_ARG_NB_MAX];
276 unsigned int lines = 0;
277 int n_argc;
278 FILE *fp;
279 char *cp;
280 int err = 0;
281 int i;
282
283 if (argc < 2) {
284 p_err("too few parameters for batch");
285 return -1;
286 } else if (!is_prefix(*argv, "file")) {
287 p_err("expected 'file', got: %s", *argv);
288 return -1;
289 } else if (argc > 2) {
290 p_err("too many parameters for batch");
291 return -1;
292 }
293 NEXT_ARG();
294
295 if (!strcmp(*argv, "-"))
296 fp = stdin;
297 else
298 fp = fopen(*argv, "r");
299 if (!fp) {
300 p_err("Can't open file (%s): %s", *argv, strerror(errno));
301 return -1;
302 }
303
304 if (json_output)
305 jsonw_start_array(json_wtr);
306 while (fgets(buf, sizeof(buf), fp)) {
307 cp = strchr(buf, '#');
308 if (cp)
309 *cp = '\0';
310
311 if (strlen(buf) == sizeof(buf) - 1) {
312 errno = E2BIG;
313 break;
314 }
315
316
317
318
319 while ((cp = strstr(buf, "\\\n")) != NULL) {
320 if (!fgets(contline, sizeof(contline), fp) ||
321 strlen(contline) == 0) {
322 p_err("missing continuation line on command %d",
323 lines);
324 err = -1;
325 goto err_close;
326 }
327
328 cp = strchr(contline, '#');
329 if (cp)
330 *cp = '\0';
331
332 if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
333 p_err("command %d is too long", lines);
334 err = -1;
335 goto err_close;
336 }
337 buf[strlen(buf) - 2] = '\0';
338 strcat(buf, contline);
339 }
340
341 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
342 if (!n_argc)
343 continue;
344 if (n_argc < 0) {
345 err = n_argc;
346 goto err_close;
347 }
348
349 if (json_output) {
350 jsonw_start_object(json_wtr);
351 jsonw_name(json_wtr, "command");
352 jsonw_start_array(json_wtr);
353 for (i = 0; i < n_argc; i++)
354 jsonw_string(json_wtr, n_argv[i]);
355 jsonw_end_array(json_wtr);
356 jsonw_name(json_wtr, "output");
357 }
358
359 err = cmd_select(cmds, n_argc, n_argv, do_help);
360
361 if (json_output)
362 jsonw_end_object(json_wtr);
363
364 if (err)
365 goto err_close;
366
367 lines++;
368 }
369
370 if (errno && errno != ENOENT) {
371 p_err("reading batch file failed: %s", strerror(errno));
372 err = -1;
373 } else {
374 if (!json_output)
375 printf("processed %d commands\n", lines);
376 }
377err_close:
378 if (fp != stdin)
379 fclose(fp);
380
381 if (json_output)
382 jsonw_end_array(json_wtr);
383
384 return err;
385}
386
387int main(int argc, char **argv)
388{
389 static const struct option options[] = {
390 { "json", no_argument, NULL, 'j' },
391 { "help", no_argument, NULL, 'h' },
392 { "pretty", no_argument, NULL, 'p' },
393 { "version", no_argument, NULL, 'V' },
394 { "bpffs", no_argument, NULL, 'f' },
395 { "mapcompat", no_argument, NULL, 'm' },
396 { "nomount", no_argument, NULL, 'n' },
397 { "debug", no_argument, NULL, 'd' },
398 { "use-loader", no_argument, NULL, 'L' },
399 { "base-btf", required_argument, NULL, 'B' },
400 { 0 }
401 };
402 int opt, ret;
403
404 last_do_help = do_help;
405 pretty_output = false;
406 json_output = false;
407 show_pinned = false;
408 block_mount = false;
409 bin_name = argv[0];
410
411 hash_init(prog_table.table);
412 hash_init(map_table.table);
413 hash_init(link_table.table);
414
415 opterr = 0;
416 while ((opt = getopt_long(argc, argv, "VhpjfLmndB:",
417 options, NULL)) >= 0) {
418 switch (opt) {
419 case 'V':
420 return do_version(argc, argv);
421 case 'h':
422 return do_help(argc, argv);
423 case 'p':
424 pretty_output = true;
425
426 case 'j':
427 if (!json_output) {
428 json_wtr = jsonw_new(stdout);
429 if (!json_wtr) {
430 p_err("failed to create JSON writer");
431 return -1;
432 }
433 json_output = true;
434 }
435 jsonw_pretty(json_wtr, pretty_output);
436 break;
437 case 'f':
438 show_pinned = true;
439 break;
440 case 'm':
441 relaxed_maps = true;
442 break;
443 case 'n':
444 block_mount = true;
445 break;
446 case 'd':
447 libbpf_set_print(print_all_levels);
448 verifier_logs = true;
449 break;
450 case 'B':
451 base_btf = btf__parse(optarg, NULL);
452 if (libbpf_get_error(base_btf)) {
453 p_err("failed to parse base BTF at '%s': %ld\n",
454 optarg, libbpf_get_error(base_btf));
455 base_btf = NULL;
456 return -1;
457 }
458 break;
459 case 'L':
460 use_loader = true;
461 break;
462 default:
463 p_err("unrecognized option '%s'", argv[optind - 1]);
464 if (json_output)
465 clean_and_exit(-1);
466 else
467 usage();
468 }
469 }
470
471 argc -= optind;
472 argv += optind;
473 if (argc < 0)
474 usage();
475
476 ret = cmd_select(cmds, argc, argv, do_help);
477
478 if (json_output)
479 jsonw_destroy(&json_wtr);
480
481 if (show_pinned) {
482 delete_pinned_obj_table(&prog_table);
483 delete_pinned_obj_table(&map_table);
484 delete_pinned_obj_table(&link_table);
485 }
486 btf__free(base_btf);
487
488 return ret;
489}
490
