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 void usage(void) 62 { 63 last_do_help(last_argc - 1, last_argv + 1); 64 65 exit(-1); 66 } 67 68 static int do_help(int argc, char **argv) 69 { 70 if (json_output) { 71 jsonw_null(json_wtr); 72 return 0; 73 } 74 75 fprintf(stderr, 76 "Usage: %s [OPTIONS] OBJECT { COMMAND | help }\n" 77 " %s batch file FILE\n" 78 " %s version\n" 79 "\n" 80 " OBJECT := { prog | map }\n" 81 " " HELP_SPEC_OPTIONS "\n" 82 "", 83 bin_name, bin_name, bin_name); 84 85 return 0; 86 } 87 88 static int do_version(int argc, char **argv) 89 { 90 unsigned int version[3]; 91 92 version[0] = LINUX_VERSION_CODE >> 16; 93 version[1] = LINUX_VERSION_CODE >> 8 & 0xf; 94 version[2] = LINUX_VERSION_CODE & 0xf; 95 96 if (json_output) { 97 jsonw_start_object(json_wtr); 98 jsonw_name(json_wtr, "version"); 99 jsonw_printf(json_wtr, "\"%u.%u.%u\"", 100 version[0], version[1], version[2]); 101 jsonw_end_object(json_wtr); 102 } else { 103 printf("%s v%u.%u.%u\n", bin_name, 104 version[0], version[1], version[2]); 105 } 106 return 0; 107 } 108 109 int cmd_select(const struct cmd *cmds, int argc, char **argv, 110 int (*help)(int argc, char **argv)) 111 { 112 unsigned int i; 113 114 last_argc = argc; 115 last_argv = argv; 116 last_do_help = help; 117 118 if (argc < 1 && cmds[0].func) 119 return cmds[0].func(argc, argv); 120 121 for (i = 0; cmds[i].func; i++) 122 if (is_prefix(*argv, cmds[i].cmd)) 123 return cmds[i].func(argc - 1, argv + 1); 124 125 help(argc - 1, argv + 1); 126 127 return -1; 128 } 129 130 bool is_prefix(const char *pfx, const char *str) 131 { 132 if (!pfx) 133 return false; 134 if (strlen(str) < strlen(pfx)) 135 return false; 136 137 return !memcmp(str, pfx, strlen(pfx)); 138 } 139 140 void fprint_hex(FILE *f, void *arg, unsigned int n, const char *sep) 141 { 142 unsigned char *data = arg; 143 unsigned int i; 144 145 for (i = 0; i < n; i++) { 146 const char *pfx = ""; 147 148 if (!i) 149 /* nothing */; 150 else if (!(i % 16)) 151 fprintf(f, "\n"); 152 else if (!(i % 8)) 153 fprintf(f, " "); 154 else 155 pfx = sep; 156 157 fprintf(f, "%s%02hhx", i ? pfx : "", data[i]); 158 } 159 } 160 161 static int do_batch(int argc, char **argv); 162 163 static const struct cmd cmds[] = { 164 { "help", do_help }, 165 { "batch", do_batch }, 166 { "prog", do_prog }, 167 { "map", do_map }, 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 while ((opt = getopt_long(argc, argv, "Vhpjf", 284 options, NULL)) >= 0) { 285 switch (opt) { 286 case 'V': 287 return do_version(argc, argv); 288 case 'h': 289 return do_help(argc, argv); 290 case 'p': 291 pretty_output = true; 292 /* fall through */ 293 case 'j': 294 json_output = true; 295 break; 296 case 'f': 297 show_pinned = true; 298 break; 299 default: 300 usage(); 301 } 302 } 303 304 argc -= optind; 305 argv += optind; 306 if (argc < 0) 307 usage(); 308 309 if (json_output) { 310 json_wtr = jsonw_new(stdout); 311 if (!json_wtr) { 312 p_err("failed to create JSON writer"); 313 return -1; 314 } 315 jsonw_pretty(json_wtr, pretty_output); 316 } 317 318 bfd_init(); 319 320 ret = cmd_select(cmds, argc, argv, do_help); 321 322 if (json_output) 323 jsonw_destroy(&json_wtr); 324 325 if (show_pinned) { 326 delete_pinned_obj_table(&prog_table); 327 delete_pinned_obj_table(&map_table); 328 } 329 330 return ret; 331 } 332