tools/bpf/bpftool/main.c

   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 <linux/version.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45
  46 #include <bpf.h>
  47
  48 #include "main.h"
  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 struct pinned_obj_table prog_table;
  59 struct pinned_obj_table map_table;
  60
  61 static void __noreturn clean_and_exit(int i)
  62 {
  63         if (json_output)
  64                 jsonw_destroy(&json_wtr);
  65
  66         exit(i);
  67 }
  68
  69 void usage(void)
  70 {
  71         last_do_help(last_argc - 1, last_argv + 1);
  72
  73         clean_and_exit(-1);
  74 }
  75
  76 static int do_help(int argc, char **argv)
  77 {
  78         if (json_output) {
  79                 jsonw_null(json_wtr);
  80                 return 0;
  81         }
  82
  83         fprintf(stderr,
  84                 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n"
  85                 "       %s batch file FILE\n"
  86                 "       %s version\n"
  87                 "\n"
  88                 "       OBJECT := { prog | map }\n"
  89                 "       " HELP_SPEC_OPTIONS "\n"
  90                 "",
  91                 bin_name, bin_name, bin_name);
  92
  93         return 0;
  94 }
  95
  96 static int do_version(int argc, char **argv)
  97 {
  98         unsigned int version[3];
  99
 100         version[0] = LINUX_VERSION_CODE >> 16;
 101         version[1] = LINUX_VERSION_CODE >> 8 & 0xf;
 102         version[2] = LINUX_VERSION_CODE & 0xf;
 103
 104         if (json_output) {
 105                 jsonw_start_object(json_wtr);
 106                 jsonw_name(json_wtr, "version");
 107                 jsonw_printf(json_wtr, "\"%u.%u.%u\"",
 108                              version[0], version[1], version[2]);
 109                 jsonw_end_object(json_wtr);
 110         } else {
 111                 printf("%s v%u.%u.%u\n", bin_name,
 112                        version[0], version[1], version[2]);
 113         }
 114         return 0;
 115 }
 116
 117 int cmd_select(const struct cmd *cmds, int argc, char **argv,
 118                int (*help)(int argc, char **argv))
 119 {
 120         unsigned int i;
 121
 122         last_argc = argc;
 123         last_argv = argv;
 124         last_do_help = help;
 125
 126         if (argc < 1 && cmds[0].func)
 127                 return cmds[0].func(argc, argv);
 128
 129         for (i = 0; cmds[i].func; i++)
 130                 if (is_prefix(*argv, cmds[i].cmd))
 131                         return cmds[i].func(argc - 1, argv + 1);
 132
 133         help(argc - 1, argv + 1);
 134
 135         return -1;
 136 }
 137
 138 bool is_prefix(const char *pfx, const char *str)
 139 {
 140         if (!pfx)
 141                 return false;
 142         if (strlen(str) < strlen(pfx))
 143                 return false;
 144
 145         return !memcmp(str, pfx, strlen(pfx));
 146 }
 147
 148 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep)
 149 {
 150         unsigned char *data = arg;
 151         unsigned int i;
 152
 153         for (i = 0; i < n; i++) {
 154                 const char *pfx = "";
 155
 156                 if (!i)
 157                         /* nothing */;
 158                 else if (!(i % 16))
 159                         fprintf(f, "\n");
 160                 else if (!(i % 8))
 161                         fprintf(f, "  ");
 162                 else
 163                         pfx = sep;
 164
 165                 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]);
 166         }
 167 }
 168
 169 static int do_batch(int argc, char **argv);
 170
 171 static const struct cmd cmds[] = {
 172         { "help",       do_help },
 173         { "batch",      do_batch },
 174         { "prog",       do_prog },
 175         { "map",        do_map },
 176         { "version",    do_version },
 177         { 0 }
 178 };
 179
 180 static int do_batch(int argc, char **argv)
 181 {
 182         unsigned int lines = 0;
 183         char *n_argv[4096];
 184         char buf[65536];
 185         int n_argc;
 186         FILE *fp;
 187         int err;
 188         int i;
 189
 190         if (argc < 2) {
 191                 p_err("too few parameters for batch");
 192                 return -1;
 193         } else if (!is_prefix(*argv, "file")) {
 194                 p_err("expected 'file', got: %s", *argv);
 195                 return -1;
 196         } else if (argc > 2) {
 197                 p_err("too many parameters for batch");
 198                 return -1;
 199         }
 200         NEXT_ARG();
 201
 202         fp = fopen(*argv, "r");
 203         if (!fp) {
 204                 p_err("Can't open file (%s): %s", *argv, strerror(errno));
 205                 return -1;
 206         }
 207
 208         if (json_output)
 209                 jsonw_start_array(json_wtr);
 210         while (fgets(buf, sizeof(buf), fp)) {
 211                 if (strlen(buf) == sizeof(buf) - 1) {
 212                         errno = E2BIG;
 213                         break;
 214                 }
 215
 216                 n_argc = 0;
 217                 n_argv[n_argc] = strtok(buf, " \t\n");
 218
 219                 while (n_argv[n_argc]) {
 220                         n_argc++;
 221                         if (n_argc == ARRAY_SIZE(n_argv)) {
 222                                 p_err("line %d has too many arguments, skip",
 223                                       lines);
 224                                 n_argc = 0;
 225                                 break;
 226                         }
 227                         n_argv[n_argc] = strtok(NULL, " \t\n");
 228                 }
 229
 230                 if (!n_argc)
 231                         continue;
 232
 233                 if (json_output) {
 234                         jsonw_start_object(json_wtr);
 235                         jsonw_name(json_wtr, "command");
 236                         jsonw_start_array(json_wtr);
 237                         for (i = 0; i < n_argc; i++)
 238                                 jsonw_string(json_wtr, n_argv[i]);
 239                         jsonw_end_array(json_wtr);
 240                         jsonw_name(json_wtr, "output");
 241                 }
 242
 243                 err = cmd_select(cmds, n_argc, n_argv, do_help);
 244
 245                 if (json_output)
 246                         jsonw_end_object(json_wtr);
 247
 248                 if (err)
 249                         goto err_close;
 250
 251                 lines++;
 252         }
 253
 254         if (errno && errno != ENOENT) {
 255                 perror("reading batch file failed");
 256                 err = -1;
 257         } else {
 258                 p_info("processed %d lines", lines);
 259                 err = 0;
 260         }
 261 err_close:
 262         fclose(fp);
 263
 264         if (json_output)
 265                 jsonw_end_array(json_wtr);
 266
 267         return err;
 268 }
 269
 270 int main(int argc, char **argv)
 271 {
 272         static const struct option options[] = {
 273                 { "json",       no_argument,    NULL,   'j' },
 274                 { "help",       no_argument,    NULL,   'h' },
 275                 { "pretty",     no_argument,    NULL,   'p' },
 276                 { "version",    no_argument,    NULL,   'V' },
 277                 { "bpffs",      no_argument,    NULL,   'f' },
 278                 { 0 }
 279         };
 280         int opt, ret;
 281
 282         last_do_help = do_help;
 283         pretty_output = false;
 284         json_output = false;
 285         show_pinned = false;
 286         bin_name = argv[0];
 287
 288         hash_init(prog_table.table);
 289         hash_init(map_table.table);
 290
 291         opterr = 0;
 292         while ((opt = getopt_long(argc, argv, "Vhpjf",
 293                                   options, NULL)) >= 0) {
 294                 switch (opt) {
 295                 case 'V':
 296                         return do_version(argc, argv);
 297                 case 'h':
 298                         return do_help(argc, argv);
 299                 case 'p':
 300                         pretty_output = true;
 301                         /* fall through */
 302                 case 'j':
 303                         if (!json_output) {
 304                                 json_wtr = jsonw_new(stdout);
 305                                 if (!json_wtr) {
 306                                         p_err("failed to create JSON writer");
 307                                         return -1;
 308                                 }
 309                                 json_output = true;
 310                         }
 311                         jsonw_pretty(json_wtr, pretty_output);
 312                         break;
 313                 case 'f':
 314                         show_pinned = true;
 315                         break;
 316                 default:
 317                         p_err("unrecognized option '%s'", argv[optind - 1]);
 318                         if (json_output)
 319                                 clean_and_exit(-1);
 320                         else
 321                                 usage();
 322                 }
 323         }
 324
 325         argc -= optind;
 326         argv += optind;
 327         if (argc < 0)
 328                 usage();
 329
 330         bfd_init();
 331
 332         ret = cmd_select(cmds, argc, argv, do_help);
 333
 334         if (json_output)
 335                 jsonw_destroy(&json_wtr);
 336
 337         if (show_pinned) {
 338                 delete_pinned_obj_table(&prog_table);
 339                 delete_pinned_obj_table(&map_table);
 340         }
 341
 342         return ret;
 343 }