1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */
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
21 const char *bin_name;
22 static int last_argc;
23 static char **last_argv;
24 static int (*last_do_help)(int argc, char **argv);
25 json_writer_t *json_wtr;
26 bool pretty_output;
27 bool json_output;
28 bool show_pinned;
29 bool block_mount;
30 bool verifier_logs;
31 bool relaxed_maps;
32 struct btf *base_btf;
33 struct pinned_obj_table prog_table;
34 struct pinned_obj_table map_table;
35 struct pinned_obj_table link_table;
36 struct obj_refs_table refs_table;
37
clean_and_exit(int i)38 static void __noreturn clean_and_exit(int i)
39 {
40 if (json_output)
41 jsonw_destroy(&json_wtr);
42
43 exit(i);
44 }
45
usage(void)46 void usage(void)
47 {
48 last_do_help(last_argc - 1, last_argv + 1);
49
50 clean_and_exit(-1);
51 }
52
do_help(int argc,char ** argv)53 static 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
do_version(int argc,char ** argv)73 static 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); /* root object */
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); /* features */
94 jsonw_bool_field(json_wtr, "libbfd", has_libbfd);
95 jsonw_bool_field(json_wtr, "skeletons", has_skeletons);
96 jsonw_end_object(json_wtr); /* features */
97
98 jsonw_end_object(json_wtr); /* root object */
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
cmd_select(const struct cmd * cmds,int argc,char ** argv,int (* help)(int argc,char ** argv))115 int 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
is_prefix(const char * pfx,const char * str)143 bool 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 /* Last argument MUST be NULL pointer */
detect_common_prefix(const char * arg,...)154 int 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
fprint_hex(FILE * f,void * arg,unsigned int n,const char * sep)182 void 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 /* nothing */;
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 /* Split command line into argument vector. */
make_args(char * line,char * n_argv[],int maxargs,int cmd_nb)204 static 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 /* Skip leading whitespace. */
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 /* Word begins with quote. */
223 if (*cp == '\'' || *cp == '"') {
224 char quote = *cp++;
225
226 n_argv[n_argc++] = cp;
227 /* Find ending quote. */
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 /* Find end of word. */
238 cp += strcspn(cp, ws);
239 if (*cp == '\0')
240 break;
241 }
242
243 /* Separate words. */
244 *cp++ = 0;
245 }
246 n_argv[n_argc] = NULL;
247
248 return n_argc;
249 }
250
251 static int do_batch(int argc, char **argv);
252
253 static 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
do_batch(int argc,char ** argv)271 static 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 = 0;
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 /* Append continuation lines if any (coming after a line ending
316 * with '\' in the batch file).
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 }
374 err_close:
375 if (fp != stdin)
376 fclose(fp);
377
378 if (json_output)
379 jsonw_end_array(json_wtr);
380
381 return err;
382 }
383
main(int argc,char ** argv)384 int main(int argc, char **argv)
385 {
386 static const struct option options[] = {
387 { "json", no_argument, NULL, 'j' },
388 { "help", no_argument, NULL, 'h' },
389 { "pretty", no_argument, NULL, 'p' },
390 { "version", no_argument, NULL, 'V' },
391 { "bpffs", no_argument, NULL, 'f' },
392 { "mapcompat", no_argument, NULL, 'm' },
393 { "nomount", no_argument, NULL, 'n' },
394 { "debug", no_argument, NULL, 'd' },
395 { "base-btf", required_argument, NULL, 'B' },
396 { 0 }
397 };
398 int opt, ret;
399
400 last_do_help = do_help;
401 pretty_output = false;
402 json_output = false;
403 show_pinned = false;
404 block_mount = false;
405 bin_name = argv[0];
406
407 hash_init(prog_table.table);
408 hash_init(map_table.table);
409 hash_init(link_table.table);
410
411 opterr = 0;
412 while ((opt = getopt_long(argc, argv, "VhpjfmndB:",
413 options, NULL)) >= 0) {
414 switch (opt) {
415 case 'V':
416 return do_version(argc, argv);
417 case 'h':
418 return do_help(argc, argv);
419 case 'p':
420 pretty_output = true;
421 /* fall through */
422 case 'j':
423 if (!json_output) {
424 json_wtr = jsonw_new(stdout);
425 if (!json_wtr) {
426 p_err("failed to create JSON writer");
427 return -1;
428 }
429 json_output = true;
430 }
431 jsonw_pretty(json_wtr, pretty_output);
432 break;
433 case 'f':
434 show_pinned = true;
435 break;
436 case 'm':
437 relaxed_maps = true;
438 break;
439 case 'n':
440 block_mount = true;
441 break;
442 case 'd':
443 libbpf_set_print(print_all_levels);
444 verifier_logs = true;
445 break;
446 case 'B':
447 base_btf = btf__parse(optarg, NULL);
448 if (libbpf_get_error(base_btf)) {
449 p_err("failed to parse base BTF at '%s': %ld\n",
450 optarg, libbpf_get_error(base_btf));
451 base_btf = NULL;
452 return -1;
453 }
454 break;
455 default:
456 p_err("unrecognized option '%s'", argv[optind - 1]);
457 if (json_output)
458 clean_and_exit(-1);
459 else
460 usage();
461 }
462 }
463
464 argc -= optind;
465 argv += optind;
466 if (argc < 0)
467 usage();
468
469 ret = cmd_select(cmds, argc, argv, do_help);
470
471 if (json_output)
472 jsonw_destroy(&json_wtr);
473
474 if (show_pinned) {
475 delete_pinned_obj_table(&prog_table);
476 delete_pinned_obj_table(&map_table);
477 delete_pinned_obj_table(&link_table);
478 }
479 btf__free(base_btf);
480
481 return ret;
482 }
483