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 const char *bin_name; 50 static int last_argc; 51 static char **last_argv; 52 static int (*last_do_help)(int argc, char **argv); 53 json_writer_t *json_wtr; 54 bool pretty_output; 55 bool json_output; 56 bool show_pinned; 57 struct pinned_obj_table prog_table; 58 struct pinned_obj_table map_table; 59 60 static void __noreturn clean_and_exit(int i) 61 { 62 if (json_output) 63 jsonw_destroy(&json_wtr); 64 65 exit(i); 66 } 67 68 void usage(void) 69 { 70 last_do_help(last_argc - 1, last_argv + 1); 71 72 clean_and_exit(-1); 73 } 74 75 static int do_help(int argc, char **argv) 76 { 77 if (json_output) { 78 jsonw_null(json_wtr); 79 return 0; 80 } 81 82 fprintf(stderr, 83 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n" 84 " %s batch file FILE\n" 85 " %s version\n" 86 "\n" 87 " OBJECT := { prog | map | cgroup }\n" 88 " " HELP_SPEC_OPTIONS "\n" 89 "", 90 bin_name, bin_name, bin_name); 91 92 return 0; 93 } 94 95 static int do_version(int argc, char **argv) 96 { 97 if (json_output) { 98 jsonw_start_object(json_wtr); 99 jsonw_name(json_wtr, "version"); 100 jsonw_printf(json_wtr, "\"%s\"", BPFTOOL_VERSION); 101 jsonw_end_object(json_wtr); 102 } else { 103 printf("%s v%s\n", bin_name, BPFTOOL_VERSION); 104 } 105 return 0; 106 } 107 108 int cmd_select(const struct cmd *cmds, int argc, char **argv, 109 int (*help)(int argc, char **argv)) 110 { 111 unsigned int i; 112 113 last_argc = argc; 114 last_argv = argv; 115 last_do_help = help; 116 117 if (argc < 1 && cmds[0].func) 118 return cmds[0].func(argc, argv); 119 120 for (i = 0; cmds[i].func; i++) 121 if (is_prefix(*argv, cmds[i].cmd)) 122 return cmds[i].func(argc - 1, argv + 1); 123 124 help(argc - 1, argv + 1); 125 126 return -1; 127 } 128 129 bool is_prefix(const char *pfx, const char *str) 130 { 131 if (!pfx) 132 return false; 133 if (strlen(str) < strlen(pfx)) 134 return false; 135 136 return !memcmp(str, pfx, strlen(pfx)); 137 } 138 139 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep) 140 { 141 unsigned char *data = arg; 142 unsigned int i; 143 144 for (i = 0; i < n; i++) { 145 const char *pfx = ""; 146 147 if (!i) 148 /* nothing */; 149 else if (!(i % 16)) 150 fprintf(f, "\n"); 151 else if (!(i % 8)) 152 fprintf(f, " "); 153 else 154 pfx = sep; 155 156 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]); 157 } 158 } 159 160 static int do_batch(int argc, char **argv); 161 162 static const struct cmd cmds[] = { 163 { "help", do_help }, 164 { "batch", do_batch }, 165 { "prog", do_prog }, 166 { "map", do_map }, 167 { "cgroup", do_cgroup }, 168 { "version", do_version }, 169 { 0 } 170 }; 171 172 static int do_batch(int argc, char **argv) 173 { 174 unsigned int lines = 0; 175 char *n_argv[4096]; 176 char buf[65536]; 177 int n_argc; 178 FILE *fp; 179 int err; 180 int i; 181 182 if (argc < 2) { 183 p_err("too few parameters for batch"); 184 return -1; 185 } else if (!is_prefix(*argv, "file")) { 186 p_err("expected 'file', got: %s", *argv); 187 return -1; 188 } else if (argc > 2) { 189 p_err("too many parameters for batch"); 190 return -1; 191 } 192 NEXT_ARG(); 193 194 fp = fopen(*argv, "r"); 195 if (!fp) { 196 p_err("Can't open file (%s): %s", *argv, strerror(errno)); 197 return -1; 198 } 199 200 if (json_output) 201 jsonw_start_array(json_wtr); 202 while (fgets(buf, sizeof(buf), fp)) { 203 if (strlen(buf) == sizeof(buf) - 1) { 204 errno = E2BIG; 205 break; 206 } 207 208 n_argc = 0; 209 n_argv[n_argc] = strtok(buf, " \t\n"); 210 211 while (n_argv[n_argc]) { 212 n_argc++; 213 if (n_argc == ARRAY_SIZE(n_argv)) { 214 p_err("line %d has too many arguments, skip", 215 lines); 216 n_argc = 0; 217 break; 218 } 219 n_argv[n_argc] = strtok(NULL, " \t\n"); 220 } 221 222 if (!n_argc) 223 continue; 224 225 if (json_output) { 226 jsonw_start_object(json_wtr); 227 jsonw_name(json_wtr, "command"); 228 jsonw_start_array(json_wtr); 229 for (i = 0; i < n_argc; i++) 230 jsonw_string(json_wtr, n_argv[i]); 231 jsonw_end_array(json_wtr); 232 jsonw_name(json_wtr, "output"); 233 } 234 235 err = cmd_select(cmds, n_argc, n_argv, do_help); 236 237 if (json_output) 238 jsonw_end_object(json_wtr); 239 240 if (err) 241 goto err_close; 242 243 lines++; 244 } 245 246 if (errno && errno != ENOENT) { 247 perror("reading batch file failed"); 248 err = -1; 249 } else { 250 p_info("processed %d lines", lines); 251 err = 0; 252 } 253 err_close: 254 fclose(fp); 255 256 if (json_output) 257 jsonw_end_array(json_wtr); 258 259 return err; 260 } 261 262 int main(int argc, char **argv) 263 { 264 static const struct option options[] = { 265 { "json", no_argument, NULL, 'j' }, 266 { "help", no_argument, NULL, 'h' }, 267 { "pretty", no_argument, NULL, 'p' }, 268 { "version", no_argument, NULL, 'V' }, 269 { "bpffs", no_argument, NULL, 'f' }, 270 { 0 } 271 }; 272 int opt, ret; 273 274 last_do_help = do_help; 275 pretty_output = false; 276 json_output = false; 277 show_pinned = false; 278 bin_name = argv[0]; 279 280 hash_init(prog_table.table); 281 hash_init(map_table.table); 282 283 opterr = 0; 284 while ((opt = getopt_long(argc, argv, "Vhpjf", 285 options, NULL)) >= 0) { 286 switch (opt) { 287 case 'V': 288 return do_version(argc, argv); 289 case 'h': 290 return do_help(argc, argv); 291 case 'p': 292 pretty_output = true; 293 /* fall through */ 294 case 'j': 295 if (!json_output) { 296 json_wtr = jsonw_new(stdout); 297 if (!json_wtr) { 298 p_err("failed to create JSON writer"); 299 return -1; 300 } 301 json_output = true; 302 } 303 jsonw_pretty(json_wtr, pretty_output); 304 break; 305 case 'f': 306 show_pinned = true; 307 break; 308 default: 309 p_err("unrecognized option '%s'", argv[optind - 1]); 310 if (json_output) 311 clean_and_exit(-1); 312 else 313 usage(); 314 } 315 } 316 317 argc -= optind; 318 argv += optind; 319 if (argc < 0) 320 usage(); 321 322 bfd_init(); 323 324 ret = cmd_select(cmds, argc, argv, do_help); 325 326 if (json_output) 327 jsonw_destroy(&json_wtr); 328 329 if (show_pinned) { 330 delete_pinned_obj_table(&prog_table); 331 delete_pinned_obj_table(&map_table); 332 } 333 334 return ret; 335 } 336