This source file includes following definitions.
- clean_and_exit
- usage
- do_help
- do_version
- __printf
- cmd_select
- is_prefix
- detect_common_prefix
- fprint_hex
- make_args
- do_batch
- main
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.h>
13 #include <libbpf.h>
14
15 #include "main.h"
16
17 #define BATCH_LINE_LEN_MAX 65536
18 #define BATCH_ARG_NB_MAX 4096
19
20 const char *bin_name;
21 static int last_argc;
22 static char **last_argv;
23 static int (*last_do_help)(int argc, char **argv);
24 json_writer_t *json_wtr;
25 bool pretty_output;
26 bool json_output;
27 bool show_pinned;
28 bool block_mount;
29 bool verifier_logs;
30 int bpf_flags;
31 struct pinned_obj_table prog_table;
32 struct pinned_obj_table map_table;
33
34 static void __noreturn clean_and_exit(int i)
35 {
36 if (json_output)
37 jsonw_destroy(&json_wtr);
38
39 exit(i);
40 }
41
42 void usage(void)
43 {
44 last_do_help(last_argc - 1, last_argv + 1);
45
46 clean_and_exit(-1);
47 }
48
49 static 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 }\n"
62 " " HELP_SPEC_OPTIONS "\n"
63 "",
64 bin_name, bin_name, bin_name);
65
66 return 0;
67 }
68
69 static 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
82 static int __printf(2, 0)
83 print_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
89 int 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
110 bool 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
121 int 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
149 void 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
171 static 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
218 static int do_batch(int argc, char **argv);
219
220 static 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 { "version", do_version },
231 { 0 }
232 };
233
234 static int do_batch(int argc, char **argv)
235 {
236 char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
237 char *n_argv[BATCH_ARG_NB_MAX];
238 unsigned int lines = 0;
239 int n_argc;
240 FILE *fp;
241 char *cp;
242 int err;
243 int i;
244
245 if (argc < 2) {
246 p_err("too few parameters for batch");
247 return -1;
248 } else if (!is_prefix(*argv, "file")) {
249 p_err("expected 'file', got: %s", *argv);
250 return -1;
251 } else if (argc > 2) {
252 p_err("too many parameters for batch");
253 return -1;
254 }
255 NEXT_ARG();
256
257 if (!strcmp(*argv, "-"))
258 fp = stdin;
259 else
260 fp = fopen(*argv, "r");
261 if (!fp) {
262 p_err("Can't open file (%s): %s", *argv, strerror(errno));
263 return -1;
264 }
265
266 if (json_output)
267 jsonw_start_array(json_wtr);
268 while (fgets(buf, sizeof(buf), fp)) {
269 cp = strchr(buf, '#');
270 if (cp)
271 *cp = '\0';
272
273 if (strlen(buf) == sizeof(buf) - 1) {
274 errno = E2BIG;
275 break;
276 }
277
278
279
280
281 while ((cp = strstr(buf, "\\\n")) != NULL) {
282 if (!fgets(contline, sizeof(contline), fp) ||
283 strlen(contline) == 0) {
284 p_err("missing continuation line on command %d",
285 lines);
286 err = -1;
287 goto err_close;
288 }
289
290 cp = strchr(contline, '#');
291 if (cp)
292 *cp = '\0';
293
294 if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
295 p_err("command %d is too long", lines);
296 err = -1;
297 goto err_close;
298 }
299 buf[strlen(buf) - 2] = '\0';
300 strcat(buf, contline);
301 }
302
303 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
304 if (!n_argc)
305 continue;
306 if (n_argc < 0)
307 goto err_close;
308
309 if (json_output) {
310 jsonw_start_object(json_wtr);
311 jsonw_name(json_wtr, "command");
312 jsonw_start_array(json_wtr);
313 for (i = 0; i < n_argc; i++)
314 jsonw_string(json_wtr, n_argv[i]);
315 jsonw_end_array(json_wtr);
316 jsonw_name(json_wtr, "output");
317 }
318
319 err = cmd_select(cmds, n_argc, n_argv, do_help);
320
321 if (json_output)
322 jsonw_end_object(json_wtr);
323
324 if (err)
325 goto err_close;
326
327 lines++;
328 }
329
330 if (errno && errno != ENOENT) {
331 p_err("reading batch file failed: %s", strerror(errno));
332 err = -1;
333 } else {
334 if (!json_output)
335 printf("processed %d commands\n", lines);
336 err = 0;
337 }
338 err_close:
339 if (fp != stdin)
340 fclose(fp);
341
342 if (json_output)
343 jsonw_end_array(json_wtr);
344
345 return err;
346 }
347
348 int main(int argc, char **argv)
349 {
350 static const struct option options[] = {
351 { "json", no_argument, NULL, 'j' },
352 { "help", no_argument, NULL, 'h' },
353 { "pretty", no_argument, NULL, 'p' },
354 { "version", no_argument, NULL, 'V' },
355 { "bpffs", no_argument, NULL, 'f' },
356 { "mapcompat", no_argument, NULL, 'm' },
357 { "nomount", no_argument, NULL, 'n' },
358 { "debug", no_argument, NULL, 'd' },
359 { 0 }
360 };
361 int opt, ret;
362
363 last_do_help = do_help;
364 pretty_output = false;
365 json_output = false;
366 show_pinned = false;
367 block_mount = false;
368 bin_name = argv[0];
369
370 hash_init(prog_table.table);
371 hash_init(map_table.table);
372
373 opterr = 0;
374 while ((opt = getopt_long(argc, argv, "Vhpjfmnd",
375 options, NULL)) >= 0) {
376 switch (opt) {
377 case 'V':
378 return do_version(argc, argv);
379 case 'h':
380 return do_help(argc, argv);
381 case 'p':
382 pretty_output = true;
383
384 case 'j':
385 if (!json_output) {
386 json_wtr = jsonw_new(stdout);
387 if (!json_wtr) {
388 p_err("failed to create JSON writer");
389 return -1;
390 }
391 json_output = true;
392 }
393 jsonw_pretty(json_wtr, pretty_output);
394 break;
395 case 'f':
396 show_pinned = true;
397 break;
398 case 'm':
399 bpf_flags = MAPS_RELAX_COMPAT;
400 break;
401 case 'n':
402 block_mount = true;
403 break;
404 case 'd':
405 libbpf_set_print(print_all_levels);
406 verifier_logs = true;
407 break;
408 default:
409 p_err("unrecognized option '%s'", argv[optind - 1]);
410 if (json_output)
411 clean_and_exit(-1);
412 else
413 usage();
414 }
415 }
416
417 argc -= optind;
418 argv += optind;
419 if (argc < 0)
420 usage();
421
422 ret = cmd_select(cmds, argc, argv, do_help);
423
424 if (json_output)
425 jsonw_destroy(&json_wtr);
426
427 if (show_pinned) {
428 delete_pinned_obj_table(&prog_table);
429 delete_pinned_obj_table(&map_table);
430 }
431
432 return ret;
433 }