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Linux/tools/bpf/bpftool/main.c

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  1 /*
  2  * Copyright (C) 2017-2018 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 #include <bfd.h>
 35 #include <ctype.h>
 36 #include <errno.h>
 37 #include <getopt.h>
 38 #include <linux/bpf.h>
 39 #include <stdio.h>
 40 #include <stdlib.h>
 41 #include <string.h>
 42 
 43 #include <bpf.h>
 44 
 45 #include "main.h"
 46 
 47 #define BATCH_LINE_LEN_MAX 65536
 48 #define BATCH_ARG_NB_MAX 4096
 49 
 50 const char *bin_name;
 51 static int last_argc;
 52 static char **last_argv;
 53 static int (*last_do_help)(int argc, char **argv);
 54 json_writer_t *json_wtr;
 55 bool pretty_output;
 56 bool json_output;
 57 bool show_pinned;
 58 int bpf_flags;
 59 struct pinned_obj_table prog_table;
 60 struct pinned_obj_table map_table;
 61 
 62 static void __noreturn clean_and_exit(int i)
 63 {
 64         if (json_output)
 65                 jsonw_destroy(&json_wtr);
 66 
 67         exit(i);
 68 }
 69 
 70 void usage(void)
 71 {
 72         last_do_help(last_argc - 1, last_argv + 1);
 73 
 74         clean_and_exit(-1);
 75 }
 76 
 77 static int do_help(int argc, char **argv)
 78 {
 79         if (json_output) {
 80                 jsonw_null(json_wtr);
 81                 return 0;
 82         }
 83 
 84         fprintf(stderr,
 85                 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
 86                 "       %s batch file FILE\n"
 87                 "       %s version\n"
 88                 "\n"
 89                 "       OBJECT := { prog | map | cgroup | perf | net }\n"
 90                 "       " HELP_SPEC_OPTIONS "\n"
 91                 "",
 92                 bin_name, bin_name, bin_name);
 93 
 94         return 0;
 95 }
 96 
 97 static int do_version(int argc, char **argv)
 98 {
 99         if (json_output) {
100                 jsonw_start_object(json_wtr);
101                 jsonw_name(json_wtr, "version");
102                 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION);
103                 jsonw_end_object(json_wtr);
104         } else {
105                 printf("%s v%s\n", bin_name, BPFTOOL_VERSION);
106         }
107         return 0;
108 }
109 
110 int cmd_select(const struct cmd *cmds, int argc, char **argv,
111                int (*help)(int argc, char **argv))
112 {
113         unsigned int i;
114 
115         last_argc = argc;
116         last_argv = argv;
117         last_do_help = help;
118 
119         if (argc < 1 && cmds[0].func)
120                 return cmds[0].func(argc, argv);
121 
122         for (i = 0; cmds[i].func; i++)
123                 if (is_prefix(*argv, cmds[i].cmd))
124                         return cmds[i].func(argc - 1, argv + 1);
125 
126         help(argc - 1, argv + 1);
127 
128         return -1;
129 }
130 
131 bool is_prefix(const char *pfx, const char *str)
132 {
133         if (!pfx)
134                 return false;
135         if (strlen(str) < strlen(pfx))
136                 return false;
137 
138         return !memcmp(str, pfx, strlen(pfx));
139 }
140 
141 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
142 {
143         unsigned char *data = arg;
144         unsigned int i;
145 
146         for (i = 0; i < n; i++) {
147                 const char *pfx = "";
148 
149                 if (!i)
150                         /* nothing */;
151                 else if (!(i % 16))
152                         fprintf(f, "\n");
153                 else if (!(i % 8))
154                         fprintf(f, "  ");
155                 else
156                         pfx = sep;
157 
158                 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
159         }
160 }
161 
162 /* Split command line into argument vector. */
163 static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb)
164 {
165         static const char ws[] = " \t\r\n";
166         char *cp = line;
167         int n_argc = 0;
168 
169         while (*cp) {
170                 /* Skip leading whitespace. */
171                 cp += strspn(cp, ws);
172 
173                 if (*cp == '\0')
174                         break;
175 
176                 if (n_argc >= (maxargs - 1)) {
177                         p_err("too many arguments to command %d", cmd_nb);
178                         return -1;
179                 }
180 
181                 /* Word begins with quote. */
182                 if (*cp == '\'' || *cp == '"') {
183                         char quote = *cp++;
184 
185                         n_argv[n_argc++] = cp;
186                         /* Find ending quote. */
187                         cp = strchr(cp, quote);
188                         if (!cp) {
189                                 p_err("unterminated quoted string in command %d",
190                                       cmd_nb);
191                                 return -1;
192                         }
193                 } else {
194                         n_argv[n_argc++] = cp;
195 
196                         /* Find end of word. */
197                         cp += strcspn(cp, ws);
198                         if (*cp == '\0')
199                                 break;
200                 }
201 
202                 /* Separate words. */
203                 *cp++ = 0;
204         }
205         n_argv[n_argc] = NULL;
206 
207         return n_argc;
208 }
209 
210 static int do_batch(int argc, char **argv);
211 
212 static const struct cmd cmds[] = {
213         { "help",       do_help },
214         { "batch",      do_batch },
215         { "prog",       do_prog },
216         { "map",        do_map },
217         { "cgroup",     do_cgroup },
218         { "perf",       do_perf },
219         { "net",        do_net },
220         { "version",    do_version },
221         { 0 }
222 };
223 
224 static int do_batch(int argc, char **argv)
225 {
226         char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX];
227         char *n_argv[BATCH_ARG_NB_MAX];
228         unsigned int lines = 0;
229         int n_argc;
230         FILE *fp;
231         char *cp;
232         int err;
233         int i;
234 
235         if (argc < 2) {
236                 p_err("too few parameters for batch");
237                 return -1;
238         } else if (!is_prefix(*argv, "file")) {
239                 p_err("expected 'file', got: %s", *argv);
240                 return -1;
241         } else if (argc > 2) {
242                 p_err("too many parameters for batch");
243                 return -1;
244         }
245         NEXT_ARG();
246 
247         if (!strcmp(*argv, "-"))
248                 fp = stdin;
249         else
250                 fp = fopen(*argv, "r");
251         if (!fp) {
252                 p_err("Can't open file (%s): %s", *argv, strerror(errno));
253                 return -1;
254         }
255 
256         if (json_output)
257                 jsonw_start_array(json_wtr);
258         while (fgets(buf, sizeof(buf), fp)) {
259                 cp = strchr(buf, '#');
260                 if (cp)
261                         *cp = '\0';
262 
263                 if (strlen(buf) == sizeof(buf) - 1) {
264                         errno = E2BIG;
265                         break;
266                 }
267 
268                 /* Append continuation lines if any (coming after a line ending
269                  * with '\' in the batch file).
270                  */
271                 while ((cp = strstr(buf, "\\\n")) != NULL) {
272                         if (!fgets(contline, sizeof(contline), fp) ||
273                             strlen(contline) == 0) {
274                                 p_err("missing continuation line on command %d",
275                                       lines);
276                                 err = -1;
277                                 goto err_close;
278                         }
279 
280                         cp = strchr(contline, '#');
281                         if (cp)
282                                 *cp = '\0';
283 
284                         if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) {
285                                 p_err("command %d is too long", lines);
286                                 err = -1;
287                                 goto err_close;
288                         }
289                         buf[strlen(buf) - 2] = '\0';
290                         strcat(buf, contline);
291                 }
292 
293                 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines);
294                 if (!n_argc)
295                         continue;
296                 if (n_argc < 0)
297                         goto err_close;
298 
299                 if (json_output) {
300                         jsonw_start_object(json_wtr);
301                         jsonw_name(json_wtr, "command");
302                         jsonw_start_array(json_wtr);
303                         for (i = 0; i < n_argc; i++)
304                                 jsonw_string(json_wtr, n_argv[i]);
305                         jsonw_end_array(json_wtr);
306                         jsonw_name(json_wtr, "output");
307                 }
308 
309                 err = cmd_select(cmds, n_argc, n_argv, do_help);
310 
311                 if (json_output)
312                         jsonw_end_object(json_wtr);
313 
314                 if (err)
315                         goto err_close;
316 
317                 lines++;
318         }
319 
320         if (errno && errno != ENOENT) {
321                 p_err("reading batch file failed: %s", strerror(errno));
322                 err = -1;
323         } else {
324                 if (!json_output)
325                         printf("processed %d commands\n", lines);
326                 err = 0;
327         }
328 err_close:
329         if (fp != stdin)
330                 fclose(fp);
331 
332         if (json_output)
333                 jsonw_end_array(json_wtr);
334 
335         return err;
336 }
337 
338 int main(int argc, char **argv)
339 {
340         static const struct option options[] = {
341                 { "json",       no_argument,    NULL,   'j' },
342                 { "help",       no_argument,    NULL,   'h' },
343                 { "pretty",     no_argument,    NULL,   'p' },
344                 { "version",    no_argument,    NULL,   'V' },
345                 { "bpffs",      no_argument,    NULL,   'f' },
346                 { "mapcompat",  no_argument,    NULL,   'm' },
347                 { 0 }
348         };
349         int opt, ret;
350 
351         last_do_help = do_help;
352         pretty_output = false;
353         json_output = false;
354         show_pinned = false;
355         bin_name = argv[0];
356 
357         hash_init(prog_table.table);
358         hash_init(map_table.table);
359 
360         opterr = 0;
361         while ((opt = getopt_long(argc, argv, "Vhpjfm",
362                                   options, NULL)) >= 0) {
363                 switch (opt) {
364                 case 'V':
365                         return do_version(argc, argv);
366                 case 'h':
367                         return do_help(argc, argv);
368                 case 'p':
369                         pretty_output = true;
370                         /* fall through */
371                 case 'j':
372                         if (!json_output) {
373                                 json_wtr = jsonw_new(stdout);
374                                 if (!json_wtr) {
375                                         p_err("failed to create JSON writer");
376                                         return -1;
377                                 }
378                                 json_output = true;
379                         }
380                         jsonw_pretty(json_wtr, pretty_output);
381                         break;
382                 case 'f':
383                         show_pinned = true;
384                         break;
385                 case 'm':
386                         bpf_flags = MAPS_RELAX_COMPAT;
387                         break;
388                 default:
389                         p_err("unrecognized option '%s'", argv[optind - 1]);
390                         if (json_output)
391                                 clean_and_exit(-1);
392                         else
393                                 usage();
394                 }
395         }
396 
397         argc -= optind;
398         argv += optind;
399         if (argc < 0)
400                 usage();
401 
402         bfd_init();
403 
404         ret = cmd_select(cmds, argc, argv, do_help);
405 
406         if (json_output)
407                 jsonw_destroy(&json_wtr);
408 
409         if (show_pinned) {
410                 delete_pinned_obj_table(&prog_table);
411                 delete_pinned_obj_table(&map_table);
412         }
413 
414         return ret;
415 }
416 

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