1/*- 2 * Copyright (c) 2002-2003,2010 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * Command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 */ 22 23#include <sys/wait.h> 24#include <ctype.h> 25#include <err.h> 26#include <errno.h> 27#include <signal.h> 28#include <stdio.h> 29#include <stdlib.h> 30#include <string.h> 31#include <sysexits.h> 32#include <unistd.h> 33 34#include "ipfw2.h" 35 36static void 37help(void) 38{ 39 fprintf(stderr, 40"ipfw syntax summary (but please do read the ipfw(8) manpage):\n\n" 41"\tipfw [-abcdefhnNqStTv] <command>\n\n" 42"where <command> is one of the following:\n\n" 43"add [num] [set N] [prob x] RULE-BODY\n" 44"{pipe|queue} N config PIPE-BODY\n" 45"[pipe|queue] {zero|delete|show} [N{,N}]\n" 46"nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|unreg_cgn|\n" 47" reset|reverse|proxy_only|redirect_addr linkspec|\n" 48" redirect_port linkspec|redirect_proto linkspec|\n" 49" port_range lower-upper}\n" 50"set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 51"set N {show|list|zero|resetlog|delete} [N{,N}] | flush\n" 52"table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n" 53"table all {flush | list}\n" 54"\n" 55"RULE-BODY: check-state [PARAMS] | ACTION [PARAMS] ADDR [OPTION_LIST]\n" 56"ACTION: check-state | allow | count | deny | unreach{,6} CODE |\n" 57" skipto N | {divert|tee} PORT | forward ADDR |\n" 58" pipe N | queue N | nat N | setfib FIB | reass\n" 59"PARAMS: [log [logamount LOGLIMIT]] [altq QUEUE_NAME]\n" 60"ADDR: [ MAC dst src ether_type ] \n" 61" [ ip from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 62" [ ipv6|ip6 from IP6ADDR [ PORT ] to IP6ADDR [ PORTLIST ] ]\n" 63"IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n" 64"IP6ADDR: [not] { any | me | me6 | ip6/bits | IP6LIST }\n" 65"IP6LIST: { ip6 | ip6/bits }[,IP6LIST]\n" 66"IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 67"OPTION_LIST: OPTION [OPTION_LIST]\n" 68"OPTION: bridged | diverted | diverted-loopback | diverted-output |\n" 69" {dst-ip|src-ip} IPADDR | {dst-ip6|src-ip6|dst-ipv6|src-ipv6} IP6ADDR |\n" 70" {dst-port|src-port} LIST |\n" 71" estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 72" iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 73" ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 74" icmp6types LIST | ext6hdr LIST | flow-id N[,N] | fib FIB |\n" 75" mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 76" setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 77" tcpdatalen LIST | verrevpath | versrcreach | antispoof\n" 78); 79 80 exit(0); 81} 82 83/* 84 * Called with the arguments, including program name because getopt 85 * wants it to be present. 86 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 87 * First thing we do is process parameters creating an argv[] array 88 * which includes the program name and a NULL entry at the end. 89 * If we are called with a single string, we split it on whitespace. 90 * Also, arguments with a trailing ',' are joined to the next one. 91 * The pointers (av[]) and data are in a single chunk of memory. 92 * av[0] points to the original program name, all other entries 93 * point into the allocated chunk. 94 */ 95static int 96ipfw_main(int oldac, char **oldav) 97{ 98 int ch, ac; 99 const char *errstr; 100 char **av, **save_av; 101 int do_acct = 0; /* Show packet/byte count */ 102 int try_next = 0; /* set if pipe cmd not found */ 103 int av_size; /* compute the av size */ 104 char *av_p; /* used to build the av list */ 105 106#define WHITESP " \t\f\v\n\r" 107 if (oldac < 2) 108 return 1; /* need at least one argument */ 109 110 if (oldac == 2) { 111 /* 112 * If we are called with one argument, try to split it into 113 * words for subsequent parsing. Spaces after a ',' are 114 * removed by copying the string in-place. 115 */ 116 char *arg = oldav[1]; /* The string is the first arg. */ 117 int l = strlen(arg); 118 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 119 int i, j; 120 121 for (i = j = 0; i < l; i++) { 122 if (arg[i] == '#') /* comment marker */ 123 break; 124 if (copy) { 125 arg[j++] = arg[i]; 126 copy = !strchr("," WHITESP, arg[i]); 127 } else { 128 copy = !strchr(WHITESP, arg[i]); 129 if (copy) 130 arg[j++] = arg[i]; 131 } 132 } 133 if (!copy && j > 0) /* last char was a 'blank', remove it */ 134 j--; 135 l = j; /* the new argument length */ 136 arg[j++] = '\0'; 137 if (l == 0) /* empty string! */ 138 return 1; 139 140 /* 141 * First, count number of arguments. Because of the previous 142 * processing, this is just the number of blanks plus 1. 143 */ 144 for (i = 0, ac = 1; i < l; i++) 145 if (strchr(WHITESP, arg[i]) != NULL) 146 ac++; 147 148 /* 149 * Allocate the argument list structure as a single block 150 * of memory, containing pointers and the argument 151 * strings. We include one entry for the program name 152 * because getopt expects it, and a NULL at the end 153 * to simplify further parsing. 154 */ 155 ac++; /* add 1 for the program name */ 156 av_size = (ac+1) * sizeof(char *) + l + 1; 157 av = safe_calloc(av_size, 1); 158 159 /* 160 * Init the argument pointer to the end of the array 161 * and copy arguments from arg[] to av[]. For each one, 162 * j is the initial character, i is the one past the end. 163 */ 164 av_p = (char *)&av[ac+1]; 165 for (ac = 1, i = j = 0; i < l; i++) { 166 if (strchr(WHITESP, arg[i]) != NULL || i == l-1) { 167 if (i == l-1) 168 i++; 169 bcopy(arg+j, av_p, i-j); 170 av[ac] = av_p; 171 av_p += i-j; /* the length of the string */ 172 *av_p++ = '\0'; 173 ac++; 174 j = i + 1; 175 } 176 } 177 } else { 178 /* 179 * If an argument ends with ',' join with the next one. 180 */ 181 int first, i, l=0; 182 183 /* 184 * Allocate the argument list structure as a single block 185 * of memory, containing both pointers and the argument 186 * strings. We include some space for the program name 187 * because getopt expects it. 188 * We add an extra pointer to the end of the array, 189 * to make simpler further parsing. 190 */ 191 for (i=0; i<oldac; i++) 192 l += strlen(oldav[i]); 193 194 av_size = (oldac+1) * sizeof(char *) + l + oldac; 195 av = safe_calloc(av_size, 1); 196 197 /* 198 * Init the argument pointer to the end of the array 199 * and copy arguments from arg[] to av[] 200 */ 201 av_p = (char *)&av[oldac+1]; 202 for (first = i = ac = 1, l = 0; i < oldac; i++) { 203 char *arg = oldav[i]; 204 int k = strlen(arg); 205 206 l += k; 207 if (arg[k-1] != ',' || i == oldac-1) { 208 /* Time to copy. */ 209 av[ac] = av_p; 210 for (l=0; first <= i; first++) { 211 strcat(av_p, oldav[first]); 212 av_p += strlen(oldav[first]); 213 } 214 *av_p++ = '\0'; 215 ac++; 216 l = 0; 217 first = i+1; 218 } 219 } 220 } 221 222 /* 223 * set the progname pointer to the original string 224 * and terminate the array with null 225 */ 226 av[0] = oldav[0]; 227 av[ac] = NULL; 228 229 /* Set the force flag for non-interactive processes */ 230 if (!g_co.do_force) 231 g_co.do_force = !isatty(STDIN_FILENO); 232 233#ifdef EMULATE_SYSCTL /* sysctl emulation */ 234 if ( ac >= 2 && !strcmp(av[1], "sysctl")) { 235 char *s; 236 int i; 237 238 if (ac != 3) { 239 printf( "sysctl emulation usage:\n" 240 " ipfw sysctl name[=value]\n" 241 " ipfw sysctl -a\n"); 242 return 0; 243 } 244 s = strchr(av[2], '='); 245 if (s == NULL) { 246 s = !strcmp(av[2], "-a") ? NULL : av[2]; 247 sysctlbyname(s, NULL, NULL, NULL, 0); 248 } else { /* ipfw sysctl x.y.z=value */ 249 /* assume an INT value, will extend later */ 250 if (s[1] == '\0') { 251 printf("ipfw sysctl: missing value\n\n"); 252 return 0; 253 } 254 *s = '\0'; 255 i = strtol(s+1, NULL, 0); 256 sysctlbyname(av[2], NULL, NULL, &i, sizeof(int)); 257 } 258 return 0; 259 } 260#endif 261 262 /* Save arguments for final freeing of memory. */ 263 save_av = av; 264 265 optind = optreset = 1; /* restart getopt() */ 266 while ((ch = getopt(ac, av, "abcdDefhinNp:qs:STtv")) != -1) 267 switch (ch) { 268 case 'a': 269 do_acct = 1; 270 break; 271 272 case 'b': 273 g_co.comment_only = 1; 274 g_co.do_compact = 1; 275 break; 276 277 case 'c': 278 g_co.do_compact = 1; 279 break; 280 281 case 'd': 282 g_co.do_dynamic = 1; 283 break; 284 285 case 'D': 286 g_co.do_dynamic = 2; 287 break; 288 289 case 'e': 290 /* nop for compatibility */ 291 break; 292 293 case 'f': 294 g_co.do_force = 1; 295 break; 296 297 case 'h': /* help */ 298 free(save_av); 299 help(); 300 break; /* NOTREACHED */ 301 302 case 'i': 303 g_co.do_value_as_ip = 1; 304 break; 305 306 case 'n': 307 g_co.test_only = 1; 308 break; 309 310 case 'N': 311 g_co.do_resolv = 1; 312 break; 313 314 case 'p': 315 errx(EX_USAGE, "An absolute pathname must be used " 316 "with -p option."); 317 /* NOTREACHED */ 318 319 case 'q': 320 g_co.do_quiet = 1; 321 break; 322 323 case 's': /* sort */ 324 g_co.do_sort = atoi(optarg); 325 break; 326 327 case 'S': 328 g_co.show_sets = 1; 329 break; 330 331 case 't': 332 g_co.do_time = TIMESTAMP_STRING; 333 break; 334 335 case 'T': 336 g_co.do_time = TIMESTAMP_NUMERIC; 337 break; 338 339 case 'v': /* verbose */ 340 g_co.verbose = 1; 341 break; 342 343 default: 344 free(save_av); 345 return 1; 346 } 347 348 ac -= optind; 349 av += optind; 350 NEED1("bad arguments, for usage summary ``ipfw''"); 351 352 /* 353 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 354 * e.g. "100 add allow ..." instead of "add 100 allow ...". 355 * In case, swap first and second argument to get the normal form. 356 */ 357 if (ac > 1 && isdigit(*av[0])) { 358 char *p = av[0]; 359 360 av[0] = av[1]; 361 av[1] = p; 362 } 363 364 /* 365 * Optional: pipe, queue or nat. 366 */ 367 g_co.do_nat = 0; 368 g_co.do_pipe = 0; 369 g_co.use_set = 0; 370 if (!strncmp(*av, "nat", strlen(*av))) 371 g_co.do_nat = 1; 372 else if (!strncmp(*av, "pipe", strlen(*av))) 373 g_co.do_pipe = 1; 374 else if (_substrcmp(*av, "queue") == 0) 375 g_co.do_pipe = 2; 376 else if (_substrcmp(*av, "flowset") == 0) 377 g_co.do_pipe = 2; 378 else if (_substrcmp(*av, "sched") == 0) 379 g_co.do_pipe = 3; 380 else if (!strncmp(*av, "set", strlen(*av))) { 381 if (ac > 1 && isdigit(av[1][0])) { 382 g_co.use_set = strtonum(av[1], 0, resvd_set_number, 383 &errstr); 384 if (errstr) 385 errx(EX_DATAERR, 386 "invalid set number %s\n", av[1]); 387 ac -= 2; av += 2; g_co.use_set++; 388 } 389 } 390 391 if (g_co.do_pipe || g_co.do_nat) { 392 ac--; 393 av++; 394 } 395 NEED1("missing command"); 396 397 /* 398 * For pipes, queues and nats we normally say 'nat|pipe NN config' 399 * but the code is easier to parse as 'nat|pipe config NN' 400 * so we swap the two arguments. 401 */ 402 if ((g_co.do_pipe || g_co.do_nat) && ac > 1 && isdigit(*av[0])) { 403 char *p = av[0]; 404 405 av[0] = av[1]; 406 av[1] = p; 407 } 408 409 if (g_co.use_set == 0) { 410 if (_substrcmp(*av, "add") == 0) 411 ipfw_add(av); 412 else if (g_co.do_nat && _substrcmp(*av, "show") == 0) 413 ipfw_show_nat(ac, av); 414 else if (g_co.do_pipe && _substrcmp(*av, "config") == 0) 415 ipfw_config_pipe(ac, av); 416 else if (g_co.do_nat && _substrcmp(*av, "config") == 0) 417 ipfw_config_nat(ac, av); 418 else if (_substrcmp(*av, "set") == 0) 419 ipfw_sets_handler(av); 420 else if (_substrcmp(*av, "table") == 0) 421 ipfw_table_handler(ac, av); 422 else if (_substrcmp(*av, "enable") == 0) 423 ipfw_sysctl_handler(av, 1); 424 else if (_substrcmp(*av, "disable") == 0) 425 ipfw_sysctl_handler(av, 0); 426 else 427 try_next = 1; 428 } 429 430 if (g_co.use_set || try_next) { 431 if (_substrcmp(*av, "delete") == 0) 432 ipfw_delete(av); 433 else if (!strncmp(*av, "nat64clat", strlen(*av))) 434 ipfw_nat64clat_handler(ac, av); 435 else if (!strncmp(*av, "nat64stl", strlen(*av))) 436 ipfw_nat64stl_handler(ac, av); 437 else if (!strncmp(*av, "nat64lsn", strlen(*av))) 438 ipfw_nat64lsn_handler(ac, av); 439 else if (!strncmp(*av, "nptv6", strlen(*av))) 440 ipfw_nptv6_handler(ac, av); 441 else if (_substrcmp(*av, "flush") == 0) 442 ipfw_flush(g_co.do_force); 443 else if (_substrcmp(*av, "zero") == 0) 444 ipfw_zero(ac, av, 0 /* IP_FW_ZERO */); 445 else if (_substrcmp(*av, "resetlog") == 0) 446 ipfw_zero(ac, av, 1 /* IP_FW_RESETLOG */); 447 else if (_substrcmp(*av, "print") == 0 || 448 _substrcmp(*av, "list") == 0) 449 ipfw_list(ac, av, do_acct); 450 else if (_substrcmp(*av, "show") == 0) 451 ipfw_list(ac, av, 1 /* show counters */); 452 else if (_substrcmp(*av, "table") == 0) 453 ipfw_table_handler(ac, av); 454 else if (_substrcmp(*av, "internal") == 0) 455 ipfw_internal_handler(ac, av); 456 else 457 errx(EX_USAGE, "bad command `%s'", *av); 458 } 459 460 /* Free memory allocated in the argument parsing. */ 461 free(save_av); 462 return 0; 463} 464 465 466static void 467ipfw_readfile(int ac, char *av[]) 468{ 469#define MAX_ARGS 32 470 char buf[4096]; 471 char *progname = av[0]; /* original program name */ 472 const char *cmd = NULL; /* preprocessor name, if any */ 473 const char *filename = av[ac-1]; /* file to read */ 474 int c, lineno=0; 475 FILE *f = NULL; 476 pid_t preproc = 0; 477 478 while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { 479 switch(c) { 480 case 'c': 481 g_co.do_compact = 1; 482 break; 483 484 case 'f': 485 g_co.do_force = 1; 486 break; 487 488 case 'N': 489 g_co.do_resolv = 1; 490 break; 491 492 case 'n': 493 g_co.test_only = 1; 494 break; 495 496 case 'p': 497 /* 498 * ipfw -p cmd [args] filename 499 * 500 * We are done with getopt(). All arguments 501 * except the filename go to the preprocessor, 502 * so we need to do the following: 503 * - check that a filename is actually present; 504 * - advance av by optind-1 to skip arguments 505 * already processed; 506 * - decrease ac by optind, to remove the args 507 * already processed and the final filename; 508 * - set the last entry in av[] to NULL so 509 * popen() can detect the end of the array; 510 * - set optind=ac to let getopt() terminate. 511 */ 512 if (optind == ac) 513 errx(EX_USAGE, "no filename argument"); 514 cmd = optarg; 515 av[ac-1] = NULL; 516 av += optind - 1; 517 ac -= optind; 518 optind = ac; 519 break; 520 521 case 'q': 522 g_co.do_quiet = 1; 523 break; 524 525 case 'S': 526 g_co.show_sets = 1; 527 break; 528 529 default: 530 errx(EX_USAGE, "bad arguments, for usage" 531 " summary ``ipfw''"); 532 } 533 534 } 535 536 if (cmd == NULL && ac != optind + 1) 537 errx(EX_USAGE, "extraneous filename arguments %s", av[ac-1]); 538 539 if ((f = fopen(filename, "r")) == NULL) 540 err(EX_UNAVAILABLE, "fopen: %s", filename); 541 542 if (cmd != NULL) { /* pipe through preprocessor */ 543 int pipedes[2]; 544 545 if (pipe(pipedes) == -1) 546 err(EX_OSERR, "cannot create pipe"); 547 548 preproc = fork(); 549 if (preproc == -1) 550 err(EX_OSERR, "cannot fork"); 551 552 if (preproc == 0) { 553 /* 554 * Child, will run the preprocessor with the 555 * file on stdin and the pipe on stdout. 556 */ 557 if (dup2(fileno(f), 0) == -1 558 || dup2(pipedes[1], 1) == -1) 559 err(EX_OSERR, "dup2()"); 560 fclose(f); 561 close(pipedes[1]); 562 close(pipedes[0]); 563 execvp(cmd, av); 564 err(EX_OSERR, "execvp(%s) failed", cmd); 565 } else { /* parent, will reopen f as the pipe */ 566 fclose(f); 567 close(pipedes[1]); 568 if ((f = fdopen(pipedes[0], "r")) == NULL) { 569 int savederrno = errno; 570 571 (void)kill(preproc, SIGTERM); 572 errno = savederrno; 573 err(EX_OSERR, "fdopen()"); 574 } 575 } 576 } 577 578 while (fgets(buf, sizeof(buf), f)) { /* read commands */ 579 char linename[20]; 580 char *args[2]; 581 582 lineno++; 583 snprintf(linename, sizeof(linename), "Line %d", lineno); 584 setprogname(linename); /* XXX */ 585 args[0] = progname; 586 args[1] = buf; 587 ipfw_main(2, args); 588 } 589 fclose(f); 590 if (cmd != NULL) { 591 int status; 592 593 if (waitpid(preproc, &status, 0) == -1) 594 errx(EX_OSERR, "waitpid()"); 595 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 596 errx(EX_UNAVAILABLE, 597 "preprocessor exited with status %d", 598 WEXITSTATUS(status)); 599 else if (WIFSIGNALED(status)) 600 errx(EX_UNAVAILABLE, 601 "preprocessor exited with signal %d", 602 WTERMSIG(status)); 603 } 604} 605 606int 607main(int ac, char *av[]) 608{ 609#if defined(_WIN32) && defined(TCC) 610 { 611 WSADATA wsaData; 612 int ret=0; 613 unsigned short wVersionRequested = MAKEWORD(2, 2); 614 ret = WSAStartup(wVersionRequested, &wsaData); 615 if (ret != 0) { 616 /* Tell the user that we could not find a usable */ 617 /* Winsock DLL. */ 618 printf("WSAStartup failed with error: %d\n", ret); 619 return 1; 620 } 621 } 622#endif 623 /* 624 * If the last argument is an absolute pathname, interpret it 625 * as a file to be preprocessed. 626 */ 627 628 if (ac > 1 && av[ac - 1][0] == '/') { 629 if (access(av[ac - 1], R_OK) == 0) 630 ipfw_readfile(ac, av); 631 else 632 err(EX_USAGE, "pathname: %s", av[ac - 1]); 633 } else { 634 if (ipfw_main(ac, av)) { 635 errx(EX_USAGE, 636 "usage: ipfw [options]\n" 637 "do \"ipfw -h\" or \"man ipfw\" for details"); 638 } 639 } 640 return EX_OK; 641} 642