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 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 bool relaxed_maps; 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 | gen }\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 int cmd_select(const struct cmd *cmds, int argc, char **argv, 83 int (*help)(int argc, char **argv)) 84 { 85 unsigned int i; 86 87 last_argc = argc; 88 last_argv = argv; 89 last_do_help = help; 90 91 if (argc < 1 && cmds[0].func) 92 return cmds[0].func(argc, argv); 93 94 for (i = 0; cmds[i].func; i++) 95 if (is_prefix(*argv, cmds[i].cmd)) 96 return cmds[i].func(argc - 1, argv + 1); 97 98 help(argc - 1, argv + 1); 99 100 return -1; 101 } 102 103 bool is_prefix(const char *pfx, const char *str) 104 { 105 if (!pfx) 106 return false; 107 if (strlen(str) < strlen(pfx)) 108 return false; 109 110 return !memcmp(str, pfx, strlen(pfx)); 111 } 112 113 /* Last argument MUST be NULL pointer */ 114 int detect_common_prefix(const char *arg, ...) 115 { 116 unsigned int count = 0; 117 const char *ref; 118 char msg[256]; 119 va_list ap; 120 121 snprintf(msg, sizeof(msg), "ambiguous prefix: '%s' could be '", arg); 122 va_start(ap, arg); 123 while ((ref = va_arg(ap, const char *))) { 124 if (!is_prefix(arg, ref)) 125 continue; 126 count++; 127 if (count > 1) 128 strncat(msg, "' or '", sizeof(msg) - strlen(msg) - 1); 129 strncat(msg, ref, sizeof(msg) - strlen(msg) - 1); 130 } 131 va_end(ap); 132 strncat(msg, "'", sizeof(msg) - strlen(msg) - 1); 133 134 if (count >= 2) { 135 p_err("%s", msg); 136 return -1; 137 } 138 139 return 0; 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 { "perf", do_perf }, 220 { "net", do_net }, 221 { "feature", do_feature }, 222 { "btf", do_btf }, 223 { "gen", do_gen }, 224 { "version", do_version }, 225 { 0 } 226 }; 227 228 static int do_batch(int argc, char **argv) 229 { 230 char buf[BATCH_LINE_LEN_MAX], contline[BATCH_LINE_LEN_MAX]; 231 char *n_argv[BATCH_ARG_NB_MAX]; 232 unsigned int lines = 0; 233 int n_argc; 234 FILE *fp; 235 char *cp; 236 int err; 237 int i; 238 239 if (argc < 2) { 240 p_err("too few parameters for batch"); 241 return -1; 242 } else if (!is_prefix(*argv, "file")) { 243 p_err("expected 'file', got: %s", *argv); 244 return -1; 245 } else if (argc > 2) { 246 p_err("too many parameters for batch"); 247 return -1; 248 } 249 NEXT_ARG(); 250 251 if (!strcmp(*argv, "-")) 252 fp = stdin; 253 else 254 fp = fopen(*argv, "r"); 255 if (!fp) { 256 p_err("Can't open file (%s): %s", *argv, strerror(errno)); 257 return -1; 258 } 259 260 if (json_output) 261 jsonw_start_array(json_wtr); 262 while (fgets(buf, sizeof(buf), fp)) { 263 cp = strchr(buf, '#'); 264 if (cp) 265 *cp = '\0'; 266 267 if (strlen(buf) == sizeof(buf) - 1) { 268 errno = E2BIG; 269 break; 270 } 271 272 /* Append continuation lines if any (coming after a line ending 273 * with '\' in the batch file). 274 */ 275 while ((cp = strstr(buf, "\\\n")) != NULL) { 276 if (!fgets(contline, sizeof(contline), fp) || 277 strlen(contline) == 0) { 278 p_err("missing continuation line on command %d", 279 lines); 280 err = -1; 281 goto err_close; 282 } 283 284 cp = strchr(contline, '#'); 285 if (cp) 286 *cp = '\0'; 287 288 if (strlen(buf) + strlen(contline) + 1 > sizeof(buf)) { 289 p_err("command %d is too long", lines); 290 err = -1; 291 goto err_close; 292 } 293 buf[strlen(buf) - 2] = '\0'; 294 strcat(buf, contline); 295 } 296 297 n_argc = make_args(buf, n_argv, BATCH_ARG_NB_MAX, lines); 298 if (!n_argc) 299 continue; 300 if (n_argc < 0) 301 goto err_close; 302 303 if (json_output) { 304 jsonw_start_object(json_wtr); 305 jsonw_name(json_wtr, "command"); 306 jsonw_start_array(json_wtr); 307 for (i = 0; i < n_argc; i++) 308 jsonw_string(json_wtr, n_argv[i]); 309 jsonw_end_array(json_wtr); 310 jsonw_name(json_wtr, "output"); 311 } 312 313 err = cmd_select(cmds, n_argc, n_argv, do_help); 314 315 if (json_output) 316 jsonw_end_object(json_wtr); 317 318 if (err) 319 goto err_close; 320 321 lines++; 322 } 323 324 if (errno && errno != ENOENT) { 325 p_err("reading batch file failed: %s", strerror(errno)); 326 err = -1; 327 } else { 328 if (!json_output) 329 printf("processed %d commands\n", lines); 330 err = 0; 331 } 332 err_close: 333 if (fp != stdin) 334 fclose(fp); 335 336 if (json_output) 337 jsonw_end_array(json_wtr); 338 339 return err; 340 } 341 342 int main(int argc, char **argv) 343 { 344 static const struct option options[] = { 345 { "json", no_argument, NULL, 'j' }, 346 { "help", no_argument, NULL, 'h' }, 347 { "pretty", no_argument, NULL, 'p' }, 348 { "version", no_argument, NULL, 'V' }, 349 { "bpffs", no_argument, NULL, 'f' }, 350 { "mapcompat", no_argument, NULL, 'm' }, 351 { "nomount", no_argument, NULL, 'n' }, 352 { "debug", no_argument, NULL, 'd' }, 353 { 0 } 354 }; 355 int opt, ret; 356 357 last_do_help = do_help; 358 pretty_output = false; 359 json_output = false; 360 show_pinned = false; 361 block_mount = false; 362 bin_name = argv[0]; 363 364 hash_init(prog_table.table); 365 hash_init(map_table.table); 366 367 opterr = 0; 368 while ((opt = getopt_long(argc, argv, "Vhpjfmnd", 369 options, NULL)) >= 0) { 370 switch (opt) { 371 case 'V': 372 return do_version(argc, argv); 373 case 'h': 374 return do_help(argc, argv); 375 case 'p': 376 pretty_output = true; 377 /* fall through */ 378 case 'j': 379 if (!json_output) { 380 json_wtr = jsonw_new(stdout); 381 if (!json_wtr) { 382 p_err("failed to create JSON writer"); 383 return -1; 384 } 385 json_output = true; 386 } 387 jsonw_pretty(json_wtr, pretty_output); 388 break; 389 case 'f': 390 show_pinned = true; 391 break; 392 case 'm': 393 relaxed_maps = true; 394 break; 395 case 'n': 396 block_mount = true; 397 break; 398 case 'd': 399 libbpf_set_print(print_all_levels); 400 verifier_logs = true; 401 break; 402 default: 403 p_err("unrecognized option '%s'", argv[optind - 1]); 404 if (json_output) 405 clean_and_exit(-1); 406 else 407 usage(); 408 } 409 } 410 411 argc -= optind; 412 argv += optind; 413 if (argc < 0) 414 usage(); 415 416 ret = cmd_select(cmds, argc, argv, do_help); 417 418 if (json_output) 419 jsonw_destroy(&json_wtr); 420 421 if (show_pinned) { 422 delete_pinned_obj_table(&prog_table); 423 delete_pinned_obj_table(&map_table); 424 } 425 426 return ret; 427 } 428