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 } 344