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