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TOMOYO Linux Cross Reference
Linux/tools/bpf/bpftool/main.c

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  1 /*
  2  * Copyright (C) 2017 Netronome Systems, Inc.
  3  *
  4  * This software is dual licensed under the GNU General License Version 2,
  5  * June 1991 as shown in the file COPYING in the top-level directory of this
  6  * source tree or the BSD 2-Clause License provided below.  You have the
  7  * option to license this software under the complete terms of either license.
  8  *
  9  * The BSD 2-Clause License:
 10  *
 11  *     Redistribution and use in source and binary forms, with or
 12  *     without modification, are permitted provided that the following
 13  *     conditions are met:
 14  *
 15  *      1. Redistributions of source code must retain the above
 16  *         copyright notice, this list of conditions and the following
 17  *         disclaimer.
 18  *
 19  *      2. Redistributions in binary form must reproduce the above
 20  *         copyright notice, this list of conditions and the following
 21  *         disclaimer in the documentation and/or other materials
 22  *         provided with the distribution.
 23  *
 24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 31  * SOFTWARE.
 32  */
 33 
 34 /* Author: Jakub Kicinski <kubakici@wp.pl> */
 35 
 36 #include <bfd.h>
 37 #include <ctype.h>
 38 #include <errno.h>
 39 #include <getopt.h>
 40 #include <linux/bpf.h>
 41 #include <stdio.h>
 42 #include <stdlib.h>
 43 #include <string.h>
 44 
 45 #include <bpf.h>
 46 
 47 #include "main.h"
 48 
 49 #define BATCH_LINE_LEN_MAX 65536
 50 #define BATCH_ARG_NB_MAX 4096
 51 
 52 const char *bin_name;
 53 static int last_argc;
 54 static char **last_argv;
 55 static int (*last_do_help)(int argc, char **argv);
 56 json_writer_t *json_wtr;
 57 bool pretty_output;
 58 bool json_output;
 59 bool show_pinned;
 60 struct pinned_obj_table prog_table;
 61 struct pinned_obj_table map_table;
 62 
 63 static void __noreturn clean_and_exit(int i)
 64 {
 65         if (json_output)
 66                 jsonw_destroy(&json_wtr);
 67 
 68         exit(i);
 69 }
 70 
 71 void usage(void)
 72 {
 73         last_do_help(last_argc - 1, last_argv + 1);
 74 
 75         clean_and_exit(-1);
 76 }
 77 
 78 static int do_help(int argc, char **argv)
 79 {
 80         if (json_output) {
 81                 jsonw_null(json_wtr);
 82                 return 0;
 83         }
 84 
 85         fprintf(stderr,
 86                 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
 87                 "       %s batch file FILE\n"
 88                 "       %s version\n"
 89                 "\n"
 90                 "       OBJECT := { prog | map | cgroup }\n"
 91                 "       " HELP_SPEC_OPTIONS "\n"
 92                 "",
 93                 bin_name, bin_name, bin_name);
 94 
 95         return 0;
 96 }
 97 
 98 static int do_version(int argc, char **argv)
 99 {
100         if (json_output) {
101                 jsonw_start_object(json_wtr);
102                 jsonw_name(json_wtr, "version");
103                 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION);
104                 jsonw_end_object(json_wtr);
105         } else {
106                 printf("%s v%s\n", bin_name, BPFTOOL_VERSION);
107         }
108         return 0;
109 }
110 
111 int cmd_select(const struct cmd *cmds, int argc, char **argv,
112                int (*help)(int argc, char **argv))
113 {
114         unsigned int i;
115 
116         last_argc = argc;
117         last_argv = argv;
118         last_do_help = help;
119 
120         if (argc < 1 && cmds[0].func)
121                 return cmds[0].func(argc, argv);
122 
123         for (i = 0; cmds[i].func; i++)
124                 if (is_prefix(*argv, cmds[i].cmd))
125                         return cmds[i].func(argc - 1, argv + 1);
126 
127         help(argc - 1, argv + 1);
128 
129         return -1;
130 }
131 
132 bool is_prefix(const char *pfx, const char *str)
133 {
134         if (!pfx)
135                 return false;
136         if (strlen(str) < strlen(pfx))
137                 return false;
138 
139         return !memcmp(str, pfx, strlen(pfx));
140 }
141 
142 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
143 {
144         unsigned char *data = arg;
145         unsigned int i;
146 
147         for (i = 0; i < n; i++) {
148                 const char *pfx = "";
149 
150                 if (!i)
151                         /* nothing */;
152                 else if (!(i % 16))
153                         fprintf(f, "\n");
154                 else if (!(i % 8))
155                         fprintf(f, "  ");
156                 else
157                         pfx = sep;
158 
159                 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
160         }
161 }
162 
163 /* Split command line into argument vector. */
164 static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb)
165 {
166         static const char ws[] = " \t\r\n";
167         char *cp = line;
168         int n_argc = 0;
169 
170         while (*cp) {
171                 /* Skip leading whitespace. */
172                 cp += strspn(cp, ws);
173 
174                 if (*cp == '\0')
175                         break;
176 
177                 if (n_argc >= (maxargs - 1)) {
178                         p_err("too many arguments to command %d", cmd_nb);
179                         return -1;
180                 }
181 
182                 /* Word begins with quote. */
183                 if (*cp == '\'' || *cp == '"') {
184                         char quote = *cp++;
185 
186                         n_argv[n_argc++] = cp;
187                         /* Find ending quote. */
188                         cp = strchr(cp, quote);
189                         if (!cp) {
190                                 p_err("unterminated quoted string in command %d",
191                                       cmd_nb);
192                                 return -1;
193                         }
194                 } else {
195                         n_argv[n_argc++] = cp;
196 
197                         /* Find end of word. */
198                         cp += strcspn(cp, ws);
199                         if (*cp == '\0')
200                                 break;
201                 }
202 
203                 /* Separate words. */
204                 *cp++ = 0;
205         }
206         n_argv[n_argc] = NULL;
207 
208         return n_argc;
209 }
210 
211 static int do_batch(int argc, char **argv);
212 
213 static const struct cmd cmds[] = {
214         { "help",       do_help },
215         { "batch",      do_batch },
216         { "prog",       do_prog },
217         { "map",        do_map },
218         { "cgroup",     do_cgroup },
219         { "version",    do_version },
220         { 0 }
221 };
222 
223 static int do_batch(int argc, char **argv)
224 {
225         char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
226         char *n_argv[BATCH_ARG_NB_MAX];
227         unsigned int lines = 0;
228         int n_argc;
229         FILE *fp;
230         char *cp;
231         int err;
232         int i;
233 
234         if (argc < 2) {
235                 p_err("too few parameters for batch");
236                 return -1;
237         } else if (!is_prefix(*argv, "file")) {
238                 p_err("expected 'file', got: %s", *argv);
239                 return -1;
240         } else if (argc > 2) {
241                 p_err("too many parameters for batch");
242                 return -1;
243         }
244         NEXT_ARG();
245 
246         if (!strcmp(*argv, "-"))
247                 fp = stdin;
248         else
249                 fp = fopen(*argv, "r");
250         if (!fp) {
251                 p_err("Can't open file (%s): %s", *argv, strerror(errno));
252                 return -1;
253         }
254 
255         if (json_output)
256                 jsonw_start_array(json_wtr);
257         while (fgets(buf, sizeof(buf), fp)) {
258                 cp = strchr(buf, '#');
259                 if (cp)
260                         *cp = '\0';
261 
262                 if (strlen(buf) == sizeof(buf) - 1) {
263                         errno = E2BIG;
264                         break;
265                 }
266 
267                 /* Append continuation lines if any (coming after a line ending
268                  * with '\' in the batch file).
269                  */
270                 while ((cp = strstr(buf, "\\\n")) != NULL) {
271                         if (!fgets(contline, sizeof(contline), fp) ||
272                             strlen(contline) == 0) {
273                                 p_err("missing continuation line on command %d",
274                                       lines);
275                                 err = -1;
276                                 goto err_close;
277                         }
278 
279                         cp = strchr(contline, '#');
280                         if (cp)
281                                 *cp = '\0';
282 
283                         if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
284                                 p_err("command %d is too long", lines);
285                                 err = -1;
286                                 goto err_close;
287                         }
288                         buf[strlen(buf) - 2] = '\0';
289                         strcat(buf, contline);
290                 }
291 
292                 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
293                 if (!n_argc)
294                         continue;
295                 if (n_argc < 0)
296                         goto err_close;
297 
298                 if (json_output) {
299                         jsonw_start_object(json_wtr);
300                         jsonw_name(json_wtr, "command");
301                         jsonw_start_array(json_wtr);
302                         for (i = 0; i < n_argc; i++)
303                                 jsonw_string(json_wtr, n_argv[i]);
304                         jsonw_end_array(json_wtr);
305                         jsonw_name(json_wtr, "output");
306                 }
307 
308                 err = cmd_select(cmds, n_argc, n_argv, do_help);
309 
310                 if (json_output)
311                         jsonw_end_object(json_wtr);
312 
313                 if (err)
314                         goto err_close;
315 
316                 lines++;
317         }
318 
319         if (errno && errno != ENOENT) {
320                 p_err("reading batch file failed: %s", strerror(errno));
321                 err = -1;
322         } else {
323                 p_info("processed %d commands", lines);
324                 err = 0;
325         }
326 err_close:
327         if (fp != stdin)
328                 fclose(fp);
329 
330         if (json_output)
331                 jsonw_end_array(json_wtr);
332 
333         return err;
334 }
335 
336 int main(int argc, char **argv)
337 {
338         static const struct option options[] = {
339                 { "json",       no_argument,    NULL,   'j' },
340                 { "help",       no_argument,    NULL,   'h' },
341                 { "pretty",     no_argument,    NULL,   'p' },
342                 { "version",    no_argument,    NULL,   'V' },
343                 { "bpffs",      no_argument,    NULL,   'f' },
344                 { 0 }
345         };
346         int opt, ret;
347 
348         last_do_help = do_help;
349         pretty_output = false;
350         json_output = false;
351         show_pinned = false;
352         bin_name = argv[0];
353 
354         hash_init(prog_table.table);
355         hash_init(map_table.table);
356 
357         opterr = 0;
358         while ((opt = getopt_long(argc, argv, "Vhpjf",
359                                   options, NULL)) >= 0) {
360                 switch (opt) {
361                 case 'V':
362                         return do_version(argc, argv);
363                 case 'h':
364                         return do_help(argc, argv);
365                 case 'p':
366                         pretty_output = true;
367                         /* fall through */
368                 case 'j':
369                         if (!json_output) {
370                                 json_wtr = jsonw_new(stdout);
371                                 if (!json_wtr) {
372                                         p_err("failed to create JSON writer");
373                                         return -1;
374                                 }
375                                 json_output = true;
376                         }
377                         jsonw_pretty(json_wtr, pretty_output);
378                         break;
379                 case 'f':
380                         show_pinned = true;
381                         break;
382                 default:
383                         p_err("unrecognized option '%s'", argv[optind - 1]);
384                         if (json_output)
385                                 clean_and_exit(-1);
386                         else
387                                 usage();
388                 }
389         }
390 
391         argc -= optind;
392         argv += optind;
393         if (argc < 0)
394                 usage();
395 
396         bfd_init();
397 
398         ret = cmd_select(cmds, argc, argv, do_help);
399 
400         if (json_output)
401                 jsonw_destroy(&json_wtr);
402 
403         if (show_pinned) {
404                 delete_pinned_obj_table(&prog_table);
405                 delete_pinned_obj_table(&map_table);
406         }
407 
408         return ret;
409 }
410 

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