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