1 // SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) 2 /* Copyright (C) 2017-2018 Netronome Systems, Inc. */ 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 #include <bpf/btf.h> 15 16 #include "main.h" 17 18 #define BATCH_LINE_LEN_MAX 65536 19 #define BATCH_ARG_NB_MAX 4096 20 21 const char *bin_name; 22 static int last_argc; 23 static char **last_argv; 24 static int (*last_do_help)(int argc, char **argv); 25 json_writer_t *json_wtr; 26 bool pretty_output; 27 bool json_output; 28 bool show_pinned; 29 bool block_mount; 30 bool verifier_logs; 31 bool relaxed_maps; 32 struct btf *base_btf; 33 struct pinned_obj_table prog_table; 34 struct pinned_obj_table map_table; 35 struct pinned_obj_table link_table; 36 struct obj_refs_table refs_table; 37 38 static void __noreturn clean_and_exit(int i) 39 { 40 if (json_output) 41 jsonw_destroy(&json_wtr); 42 43 exit(i); 44 } 45 46 void usage(void) 47 { 48 last_do_help(last_argc - 1, last_argv + 1); 49 50 clean_and_exit(-1); 51 } 52 53 static int do_help(int argc, char **argv) 54 { 55 if (json_output) { 56 jsonw_null(json_wtr); 57 return 0; 58 } 59 60 fprintf(stderr, 61 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n" 62 " %s batch file FILE\n" 63 " %s version\n" 64 "\n" 65 " OBJECT := { prog | map | link | cgroup | perf | net | feature | btf | gen | struct_ops | iter }\n" 66 " " HELP_SPEC_OPTIONS "\n" 67 "", 68 bin_name, bin_name, bin_name); 69 70 return 0; 71 } 72 73 static int do_version(int argc, char **argv) 74 { 75 #ifdef HAVE_LIBBFD_SUPPORT 76 const bool has_libbfd = true; 77 #else 78 const bool has_libbfd = false; 79 #endif 80 #ifdef BPFTOOL_WITHOUT_SKELETONS 81 const bool has_skeletons = false; 82 #else 83 const bool has_skeletons = true; 84 #endif 85 86 if (json_output) { 87 jsonw_start_object(json_wtr); /* root object */ 88 89 jsonw_name(json_wtr, "version"); 90 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION); 91 92 jsonw_name(json_wtr, "features"); 93 jsonw_start_object(json_wtr); /* features */ 94 jsonw_bool_field(json_wtr, "libbfd", has_libbfd); 95 jsonw_bool_field(json_wtr, "skeletons", has_skeletons); 96 jsonw_end_object(json_wtr); /* features */ 97 98 jsonw_end_object(json_wtr); /* root object */ 99 } else { 100 unsigned int nb_features = 0; 101 102 printf("%s v%s\n", bin_name, BPFTOOL_VERSION); 103 printf("features:"); 104 if (has_libbfd) { 105 printf(" libbfd"); 106 nb_features++; 107 } 108 if (has_skeletons) 109 printf("%s skeletons", nb_features++ ? "," : ""); 110 printf("\n"); 111 } 112 return 0; 113 } 114 115 int cmd_select(const struct cmd *cmds, int argc, char **argv, 116 int (*help)(int argc, char **argv)) 117 { 118 unsigned int i; 119 120 last_argc = argc; 121 last_argv = argv; 122 last_do_help = help; 123 124 if (argc < 1 && cmds[0].func) 125 return cmds[0].func(argc, argv); 126 127 for (i = 0; cmds[i].cmd; i++) { 128 if (is_prefix(*argv, cmds[i].cmd)) { 129 if (!cmds[i].func) { 130 p_err("command '%s' is not supported in bootstrap mode", 131 cmds[i].cmd); 132 return -1; 133 } 134 return cmds[i].func(argc - 1, argv + 1); 135 } 136 } 137 138 help(argc - 1, argv + 1); 139 140 return -1; 141 } 142 143 bool is_prefix(const char *pfx, const char *str) 144 { 145 if (!pfx) 146 return false; 147 if (strlen(str) < strlen(pfx)) 148 return false; 149 150 return !memcmp(str, pfx, strlen(pfx)); 151 } 152 153 /* Last argument MUST be NULL pointer */ 154 int detect_common_prefix(const char *arg, ...) 155 { 156 unsigned int count = 0; 157 const char *ref; 158 char msg[256]; 159 va_list ap; 160 161 snprintf(msg, sizeof(msg), "ambiguous prefix: '%s' could be '", arg); 162 va_start(ap, arg); 163 while ((ref = va_arg(ap, const char *))) { 164 if (!is_prefix(arg, ref)) 165 continue; 166 count++; 167 if (count > 1) 168 strncat(msg, "' or '", sizeof(msg) - strlen(msg) - 1); 169 strncat(msg, ref, sizeof(msg) - strlen(msg) - 1); 170 } 171 va_end(ap); 172 strncat(msg, "'", sizeof(msg) - strlen(msg) - 1); 173 174 if (count >= 2) { 175 p_err("%s", msg); 176 return -1; 177 } 178 179 return 0; 180 } 181 182 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep) 183 { 184 unsigned char *data = arg; 185 unsigned int i; 186 187 for (i = 0; i < n; i++) { 188 const char *pfx = ""; 189 190 if (!i) 191 /* nothing */; 192 else if (!(i % 16)) 193 fprintf(f, "\n"); 194 else if (!(i % 8)) 195 fprintf(f, " "); 196 else 197 pfx = sep; 198 199 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]); 200 } 201 } 202 203 /* Split command line into argument vector. */ 204 static int make_args(char *line, char *n_argv[], int maxargs, int cmd_nb) 205 { 206 static const char ws[] = " \t\r\n"; 207 char *cp = line; 208 int n_argc = 0; 209 210 while (*cp) { 211 /* Skip leading whitespace. */ 212 cp += strspn(cp, ws); 213 214 if (*cp == '\0') 215 break; 216 217 if (n_argc >= (maxargs - 1)) { 218 p_err("too many arguments to command %d", cmd_nb); 219 return -1; 220 } 221 222 /* Word begins with quote. */ 223 if (*cp == '\'' || *cp == '"') { 224 char quote = *cp++; 225 226 n_argv[n_argc++] = cp; 227 /* Find ending quote. */ 228 cp = strchr(cp, quote); 229 if (!cp) { 230 p_err("unterminated quoted string in command %d", 231 cmd_nb); 232 return -1; 233 } 234 } else { 235 n_argv[n_argc++] = cp; 236 237 /* Find end of word. */ 238 cp += strcspn(cp, ws); 239 if (*cp == '\0') 240 break; 241 } 242 243 /* Separate words. */ 244 *cp++ = 0; 245 } 246 n_argv[n_argc] = NULL; 247 248 return n_argc; 249 } 250 251 static int do_batch(int argc, char **argv); 252 253 static const struct cmd cmds[] = { 254 { "help", do_help }, 255 { "batch", do_batch }, 256 { "prog", do_prog }, 257 { "map", do_map }, 258 { "link", do_link }, 259 { "cgroup", do_cgroup }, 260 { "perf", do_perf }, 261 { "net", do_net }, 262 { "feature", do_feature }, 263 { "btf", do_btf }, 264 { "gen", do_gen }, 265 { "struct_ops", do_struct_ops }, 266 { "iter", do_iter }, 267 { "version", do_version }, 268 { 0 } 269 }; 270 271 static int do_batch(int argc, char **argv) 272 { 273 char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX]; 274 char *n_argv[BATCH_ARG_NB_MAX]; 275 unsigned int lines = 0; 276 int n_argc; 277 FILE *fp; 278 char *cp; 279 int err; 280 int i; 281 282 if (argc < 2) { 283 p_err("too few parameters for batch"); 284 return -1; 285 } else if (!is_prefix(*argv, "file")) { 286 p_err("expected 'file', got: %s", *argv); 287 return -1; 288 } else if (argc > 2) { 289 p_err("too many parameters for batch"); 290 return -1; 291 } 292 NEXT_ARG(); 293 294 if (!strcmp(*argv, "-")) 295 fp = stdin; 296 else 297 fp = fopen(*argv, "r"); 298 if (!fp) { 299 p_err("Can't open file (%s): %s", *argv, strerror(errno)); 300 return -1; 301 } 302 303 if (json_output) 304 jsonw_start_array(json_wtr); 305 while (fgets(buf, sizeof(buf), fp)) { 306 cp = strchr(buf, '#'); 307 if (cp) 308 *cp = '\0'; 309 310 if (strlen(buf) == sizeof(buf) - 1) { 311 errno = E2BIG; 312 break; 313 } 314 315 /* Append continuation lines if any (coming after a line ending 316 * with '\' in the batch file). 317 */ 318 while ((cp = strstr(buf, "\\\n")) != NULL) { 319 if (!fgets(contline, sizeof(contline), fp) || 320 strlen(contline) == 0) { 321 p_err("missing continuation line on command %d", 322 lines); 323 err = -1; 324 goto err_close; 325 } 326 327 cp = strchr(contline, '#'); 328 if (cp) 329 *cp = '\0'; 330 331 if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) { 332 p_err("command %d is too long", lines); 333 err = -1; 334 goto err_close; 335 } 336 buf[strlen(buf) - 2] = '\0'; 337 strcat(buf, contline); 338 } 339 340 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines); 341 if (!n_argc) 342 continue; 343 if (n_argc < 0) 344 goto err_close; 345 346 if (json_output) { 347 jsonw_start_object(json_wtr); 348 jsonw_name(json_wtr, "command"); 349 jsonw_start_array(json_wtr); 350 for (i = 0; i < n_argc; i++) 351 jsonw_string(json_wtr, n_argv[i]); 352 jsonw_end_array(json_wtr); 353 jsonw_name(json_wtr, "output"); 354 } 355 356 err = cmd_select(cmds, n_argc, n_argv, do_help); 357 358 if (json_output) 359 jsonw_end_object(json_wtr); 360 361 if (err) 362 goto err_close; 363 364 lines++; 365 } 366 367 if (errno && errno != ENOENT) { 368 p_err("reading batch file failed: %s", strerror(errno)); 369 err = -1; 370 } else { 371 if (!json_output) 372 printf("processed %d commands\n", lines); 373 err = 0; 374 } 375 err_close: 376 if (fp != stdin) 377 fclose(fp); 378 379 if (json_output) 380 jsonw_end_array(json_wtr); 381 382 return err; 383 } 384 385 int main(int argc, char **argv) 386 { 387 static const struct option options[] = { 388 { "json", no_argument, NULL, 'j' }, 389 { "help", no_argument, NULL, 'h' }, 390 { "pretty", no_argument, NULL, 'p' }, 391 { "version", no_argument, NULL, 'V' }, 392 { "bpffs", no_argument, NULL, 'f' }, 393 { "mapcompat", no_argument, NULL, 'm' }, 394 { "nomount", no_argument, NULL, 'n' }, 395 { "debug", no_argument, NULL, 'd' }, 396 { "base-btf", required_argument, NULL, 'B' }, 397 { 0 } 398 }; 399 int opt, ret; 400 401 last_do_help = do_help; 402 pretty_output = false; 403 json_output = false; 404 show_pinned = false; 405 block_mount = false; 406 bin_name = argv[0]; 407 408 hash_init(prog_table.table); 409 hash_init(map_table.table); 410 hash_init(link_table.table); 411 412 opterr = 0; 413 while ((opt = getopt_long(argc, argv, "VhpjfmndB:", 414 options, NULL)) >= 0) { 415 switch (opt) { 416 case 'V': 417 return do_version(argc, argv); 418 case 'h': 419 return do_help(argc, argv); 420 case 'p': 421 pretty_output = true; 422 /* fall through */ 423 case 'j': 424 if (!json_output) { 425 json_wtr = jsonw_new(stdout); 426 if (!json_wtr) { 427 p_err("failed to create JSON writer"); 428 return -1; 429 } 430 json_output = true; 431 } 432 jsonw_pretty(json_wtr, pretty_output); 433 break; 434 case 'f': 435 show_pinned = true; 436 break; 437 case 'm': 438 relaxed_maps = true; 439 break; 440 case 'n': 441 block_mount = true; 442 break; 443 case 'd': 444 libbpf_set_print(print_all_levels); 445 verifier_logs = true; 446 break; 447 case 'B': 448 base_btf = btf__parse(optarg, NULL); 449 if (libbpf_get_error(base_btf)) { 450 p_err("failed to parse base BTF at '%s': %ld\n", 451 optarg, libbpf_get_error(base_btf)); 452 base_btf = NULL; 453 return -1; 454 } 455 break; 456 default: 457 p_err("unrecognized option '%s'", argv[optind - 1]); 458 if (json_output) 459 clean_and_exit(-1); 460 else 461 usage(); 462 } 463 } 464 465 argc -= optind; 466 argv += optind; 467 if (argc < 0) 468 usage(); 469 470 ret = cmd_select(cmds, argc, argv, do_help); 471 472 if (json_output) 473 jsonw_destroy(&json_wtr); 474 475 if (show_pinned) { 476 delete_pinned_obj_table(&prog_table); 477 delete_pinned_obj_table(&map_table); 478 delete_pinned_obj_table(&link_table); 479 } 480 btf__free(base_btf); 481 482 return ret; 483 } 484