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 #include <libgen.h> 34 35 #include "ipfw2.h" 36 37 static void 38 help(void) 39 { 40 if (is_ipfw()) { 41 fprintf(stderr, 42 "ipfw syntax summary (but please do read the ipfw(8) manpage):\n\n" 43 "\tipfw [-abcdefhnNqStTv] <command>\n\n" 44 "where <command> is one of the following:\n\n" 45 "add [num] [set N] [prob x] RULE-BODY\n" 46 "{pipe|queue} N config PIPE-BODY\n" 47 "[pipe|queue] {zero|delete|show} [N{,N}]\n" 48 "nat N config {ip IPADDR|if IFNAME|log|deny_in|same_ports|unreg_only|unreg_cgn|\n" 49 " reset|reverse|proxy_only|redirect_addr linkspec|\n" 50 " redirect_port linkspec|redirect_proto linkspec|\n" 51 " port_range lower-upper}\n" 52 "set [disable N... enable N...] | move [rule] X to Y | swap X Y | show\n" 53 "set N {show|list|zero|resetlog|delete} [N{,N}] | flush\n" 54 "table N {add ip[/bits] [value] | delete ip[/bits] | flush | list}\n" 55 "table all {flush | list}\n" 56 "\n" 57 "RULE-BODY: check-state [PARAMS] | ACTION [PARAMS] ADDR [OPTION_LIST]\n" 58 "ACTION: check-state | allow | count | deny | unreach{,6} CODE |\n" 59 " skipto N | {divert|tee} PORT | forward ADDR |\n" 60 " pipe N | queue N | nat N | setfib FIB | reass\n" 61 "PARAMS: [log [logamount LOGLIMIT]] [altq QUEUE_NAME]\n" 62 "ADDR: [ MAC dst src ether_type ] \n" 63 " [ ip from IPADDR [ PORT ] to IPADDR [ PORTLIST ] ]\n" 64 " [ ipv6|ip6 from IP6ADDR [ PORT ] to IP6ADDR [ PORTLIST ] ]\n" 65 "IPADDR: [not] { any | me | ip/bits{x,y,z} | table(t[,v]) | IPLIST }\n" 66 "IP6ADDR: [not] { any | me | me6 | ip6/bits | IP6LIST }\n" 67 "IP6LIST: { ip6 | ip6/bits }[,IP6LIST]\n" 68 "IPLIST: { ip | ip/bits | ip:mask }[,IPLIST]\n" 69 "OPTION_LIST: OPTION [OPTION_LIST]\n" 70 "OPTION: bridged | diverted | diverted-loopback | diverted-output |\n" 71 " {dst-ip|src-ip} IPADDR | {dst-ip6|src-ip6|dst-ipv6|src-ipv6} IP6ADDR |\n" 72 " {dst-port|src-port} LIST |\n" 73 " estab | frag | {gid|uid} N | icmptypes LIST | in | out | ipid LIST |\n" 74 " iplen LIST | ipoptions SPEC | ipprecedence | ipsec | iptos SPEC |\n" 75 " ipttl LIST | ipversion VER | keep-state | layer2 | limit ... |\n" 76 " icmp6types LIST | ext6hdr LIST | flow-id N[,N] | fib FIB |\n" 77 " mac ... | mac-type LIST | proto LIST | {recv|xmit|via} {IF|IPADDR} |\n" 78 " setup | {tcpack|tcpseq|tcpwin} NN | tcpflags SPEC | tcpoptions SPEC |\n" 79 " tcpdatalen LIST | verrevpath | versrcreach | antispoof\n" 80 ); 81 } else { 82 fprintf(stderr, 83 "dnctl syntax summary (but please do read the dnctl(8) manpage):\n\n" 84 "\tdnctl [-hnsv] <command>\n\n" 85 "where <command> is one of the following:\n\n" 86 "[pipe|queue|sched] N config PIPE-BODY\n" 87 "[pipe|queue|sched] {delete|list|show} [N{,N}]\n" 88 "\n" 89 ); 90 } 91 92 exit(0); 93 } 94 95 /* 96 * Called with the arguments, including program name because getopt 97 * wants it to be present. 98 * Returns 0 if successful, 1 if empty command, errx() in case of errors. 99 * First thing we do is process parameters creating an argv[] array 100 * which includes the program name and a NULL entry at the end. 101 * If we are called with a single string, we split it on whitespace. 102 * Also, arguments with a trailing ',' are joined to the next one. 103 * The pointers (av[]) and data are in a single chunk of memory. 104 * av[0] points to the original program name, all other entries 105 * point into the allocated chunk. 106 */ 107 static int 108 ipfw_main(int oldac, char **oldav) 109 { 110 int ch, ac; 111 const char *errstr; 112 char **av, **save_av; 113 int do_acct = 0; /* Show packet/byte count */ 114 int try_next = 0; /* set if pipe cmd not found */ 115 int av_size; /* compute the av size */ 116 char *av_p; /* used to build the av list */ 117 118 #define WHITESP " \t\f\v\n\r" 119 if (oldac < 2) 120 return 1; /* need at least one argument */ 121 122 if (oldac == 2) { 123 /* 124 * If we are called with one argument, try to split it into 125 * words for subsequent parsing. Spaces after a ',' are 126 * removed by copying the string in-place. 127 */ 128 char *arg = oldav[1]; /* The string is the first arg. */ 129 int l = strlen(arg); 130 int copy = 0; /* 1 if we need to copy, 0 otherwise */ 131 int i, j; 132 133 for (i = j = 0; i < l; i++) { 134 if (arg[i] == '#') /* comment marker */ 135 break; 136 if (copy) { 137 arg[j++] = arg[i]; 138 copy = !strchr("," WHITESP, arg[i]); 139 } else { 140 copy = !strchr(WHITESP, arg[i]); 141 if (copy) 142 arg[j++] = arg[i]; 143 } 144 } 145 if (!copy && j > 0) /* last char was a 'blank', remove it */ 146 j--; 147 l = j; /* the new argument length */ 148 arg[j++] = '\0'; 149 if (l == 0) /* empty string! */ 150 return 1; 151 152 /* 153 * First, count number of arguments. Because of the previous 154 * processing, this is just the number of blanks plus 1. 155 */ 156 for (i = 0, ac = 1; i < l; i++) 157 if (strchr(WHITESP, arg[i]) != NULL) 158 ac++; 159 160 /* 161 * Allocate the argument list structure as a single block 162 * of memory, containing pointers and the argument 163 * strings. We include one entry for the program name 164 * because getopt expects it, and a NULL at the end 165 * to simplify further parsing. 166 */ 167 ac++; /* add 1 for the program name */ 168 av_size = (ac+1) * sizeof(char *) + l + 1; 169 av = safe_calloc(av_size, 1); 170 171 /* 172 * Init the argument pointer to the end of the array 173 * and copy arguments from arg[] to av[]. For each one, 174 * j is the initial character, i is the one past the end. 175 */ 176 av_p = (char *)&av[ac+1]; 177 for (ac = 1, i = j = 0; i < l; i++) { 178 if (strchr(WHITESP, arg[i]) != NULL || i == l-1) { 179 if (i == l-1) 180 i++; 181 bcopy(arg+j, av_p, i-j); 182 av[ac] = av_p; 183 av_p += i-j; /* the length of the string */ 184 *av_p++ = '\0'; 185 ac++; 186 j = i + 1; 187 } 188 } 189 } else { 190 /* 191 * If an argument ends with ',' join with the next one. 192 */ 193 int first, i, l=0; 194 195 /* 196 * Allocate the argument list structure as a single block 197 * of memory, containing both pointers and the argument 198 * strings. We include some space for the program name 199 * because getopt expects it. 200 * We add an extra pointer to the end of the array, 201 * to make simpler further parsing. 202 */ 203 for (i=0; i<oldac; i++) 204 l += strlen(oldav[i]); 205 206 av_size = (oldac+1) * sizeof(char *) + l + oldac; 207 av = safe_calloc(av_size, 1); 208 209 /* 210 * Init the argument pointer to the end of the array 211 * and copy arguments from arg[] to av[] 212 */ 213 av_p = (char *)&av[oldac+1]; 214 for (first = i = ac = 1, l = 0; i < oldac; i++) { 215 char *arg = oldav[i]; 216 int k = strlen(arg); 217 218 l += k; 219 if (arg[k-1] != ',' || i == oldac-1) { 220 /* Time to copy. */ 221 av[ac] = av_p; 222 for (l=0; first <= i; first++) { 223 strcat(av_p, oldav[first]); 224 av_p += strlen(oldav[first]); 225 } 226 *av_p++ = '\0'; 227 ac++; 228 l = 0; 229 first = i+1; 230 } 231 } 232 } 233 234 /* 235 * set the progname pointer to the original string 236 * and terminate the array with null 237 */ 238 av[0] = oldav[0]; 239 av[ac] = NULL; 240 241 /* Set the force flag for non-interactive processes */ 242 if (!g_co.do_force) 243 g_co.do_force = !isatty(STDIN_FILENO); 244 245 #ifdef EMULATE_SYSCTL /* sysctl emulation */ 246 if (is_ipfw() && ac >= 2 && 247 !strcmp(av[1], "sysctl")) { 248 char *s; 249 int i; 250 251 if (ac != 3) { 252 printf( "sysctl emulation usage:\n" 253 " ipfw sysctl name[=value]\n" 254 " ipfw sysctl -a\n"); 255 return 0; 256 } 257 s = strchr(av[2], '='); 258 if (s == NULL) { 259 s = !strcmp(av[2], "-a") ? NULL : av[2]; 260 sysctlbyname(s, NULL, NULL, NULL, 0); 261 } else { /* ipfw sysctl x.y.z=value */ 262 /* assume an INT value, will extend later */ 263 if (s[1] == '\0') { 264 printf("ipfw sysctl: missing value\n\n"); 265 return 0; 266 } 267 *s = '\0'; 268 i = strtol(s+1, NULL, 0); 269 sysctlbyname(av[2], NULL, NULL, &i, sizeof(int)); 270 } 271 return 0; 272 } 273 #endif 274 275 /* Save arguments for final freeing of memory. */ 276 save_av = av; 277 278 optind = optreset = 1; /* restart getopt() */ 279 if (is_ipfw()) { 280 while ((ch = getopt(ac, av, "abcdDefhinNp:qs:STtv")) != -1) 281 switch (ch) { 282 case 'a': 283 do_acct = 1; 284 break; 285 286 case 'b': 287 g_co.comment_only = 1; 288 g_co.do_compact = 1; 289 break; 290 291 case 'c': 292 g_co.do_compact = 1; 293 break; 294 295 case 'd': 296 g_co.do_dynamic = 1; 297 break; 298 299 case 'D': 300 g_co.do_dynamic = 2; 301 break; 302 303 case 'e': 304 /* nop for compatibility */ 305 break; 306 307 case 'f': 308 g_co.do_force = 1; 309 break; 310 311 case 'h': /* help */ 312 free(save_av); 313 help(); 314 break; /* NOTREACHED */ 315 316 case 'i': 317 g_co.do_value_as_ip = 1; 318 break; 319 320 case 'n': 321 g_co.test_only = 1; 322 break; 323 324 case 'N': 325 g_co.do_resolv = 1; 326 break; 327 328 case 'p': 329 errx(EX_USAGE, "An absolute pathname must be used " 330 "with -p option."); 331 /* NOTREACHED */ 332 333 case 'q': 334 g_co.do_quiet = 1; 335 break; 336 337 case 's': /* sort */ 338 g_co.do_sort = atoi(optarg); 339 break; 340 341 case 'S': 342 g_co.show_sets = 1; 343 break; 344 345 case 't': 346 g_co.do_time = TIMESTAMP_STRING; 347 break; 348 349 case 'T': 350 g_co.do_time = TIMESTAMP_NUMERIC; 351 break; 352 353 case 'v': /* verbose */ 354 g_co.verbose = 1; 355 break; 356 357 default: 358 free(save_av); 359 return 1; 360 } 361 } else { 362 while ((ch = getopt(ac, av, "hns:v")) != -1) 363 switch (ch) { 364 365 case 'h': /* help */ 366 free(save_av); 367 help(); 368 break; /* NOTREACHED */ 369 370 case 'n': 371 g_co.test_only = 1; 372 break; 373 374 case 's': /* sort */ 375 g_co.do_sort = atoi(optarg); 376 break; 377 378 case 'v': /* verbose */ 379 g_co.verbose = 1; 380 break; 381 382 default: 383 free(save_av); 384 return 1; 385 } 386 387 } 388 389 ac -= optind; 390 av += optind; 391 NEED1("bad arguments, for usage summary ``ipfw''"); 392 393 /* 394 * An undocumented behaviour of ipfw1 was to allow rule numbers first, 395 * e.g. "100 add allow ..." instead of "add 100 allow ...". 396 * In case, swap first and second argument to get the normal form. 397 */ 398 if (ac > 1 && isdigit(*av[0])) { 399 char *p = av[0]; 400 401 av[0] = av[1]; 402 av[1] = p; 403 } 404 405 /* 406 * Optional: pipe, queue or nat. 407 */ 408 g_co.do_nat = 0; 409 g_co.do_pipe = 0; 410 g_co.use_set = 0; 411 if (is_ipfw() && !strncmp(*av, "nat", strlen(*av))) 412 g_co.do_nat = 1; 413 else if (!strncmp(*av, "pipe", strlen(*av))) 414 g_co.do_pipe = 1; 415 else if (_substrcmp(*av, "queue") == 0) 416 g_co.do_pipe = 2; 417 else if (_substrcmp(*av, "flowset") == 0) 418 g_co.do_pipe = 2; 419 else if (_substrcmp(*av, "sched") == 0) 420 g_co.do_pipe = 3; 421 else if (is_ipfw() && !strncmp(*av, "set", strlen(*av))) { 422 if (ac > 1 && isdigit(av[1][0])) { 423 g_co.use_set = strtonum(av[1], 0, resvd_set_number, 424 &errstr); 425 if (errstr) 426 errx(EX_DATAERR, 427 "invalid set number %s\n", av[1]); 428 ac -= 2; av += 2; g_co.use_set++; 429 } 430 } 431 432 if (g_co.do_pipe || g_co.do_nat) { 433 ac--; 434 av++; 435 } 436 NEED1("missing command"); 437 438 /* 439 * For pipes, queues and nats we normally say 'nat|pipe NN config' 440 * but the code is easier to parse as 'nat|pipe config NN' 441 * so we swap the two arguments. 442 */ 443 if ((g_co.do_pipe || g_co.do_nat) && ac > 1 && isdigit(*av[0])) { 444 char *p = av[0]; 445 446 av[0] = av[1]; 447 av[1] = p; 448 } 449 450 if (! is_ipfw() && g_co.do_pipe == 0) { 451 help(); 452 } 453 454 if (g_co.use_set == 0) { 455 if (is_ipfw() && _substrcmp(*av, "add") == 0) 456 ipfw_add(av); 457 else if (g_co.do_nat && _substrcmp(*av, "show") == 0) 458 ipfw_show_nat(ac, av); 459 else if (g_co.do_pipe && _substrcmp(*av, "config") == 0) 460 ipfw_config_pipe(ac, av); 461 else if (g_co.do_nat && _substrcmp(*av, "config") == 0) 462 ipfw_config_nat(ac, av); 463 else if (is_ipfw() && _substrcmp(*av, "set") == 0) 464 ipfw_sets_handler(av); 465 else if (is_ipfw() && _substrcmp(*av, "table") == 0) 466 ipfw_table_handler(ac, av); 467 else if (is_ipfw() && _substrcmp(*av, "enable") == 0) 468 ipfw_sysctl_handler(av, 1); 469 else if (is_ipfw() && _substrcmp(*av, "disable") == 0) 470 ipfw_sysctl_handler(av, 0); 471 else 472 try_next = 1; 473 } 474 475 if (g_co.use_set || try_next) { 476 if (_substrcmp(*av, "delete") == 0) 477 ipfw_delete(av); 478 else if (is_ipfw() && !strncmp(*av, "nat64clat", strlen(*av))) 479 ipfw_nat64clat_handler(ac, av); 480 else if (is_ipfw() && !strncmp(*av, "nat64stl", strlen(*av))) 481 ipfw_nat64stl_handler(ac, av); 482 else if (is_ipfw() && !strncmp(*av, "nat64lsn", strlen(*av))) 483 ipfw_nat64lsn_handler(ac, av); 484 else if (is_ipfw() && !strncmp(*av, "nptv6", strlen(*av))) 485 ipfw_nptv6_handler(ac, av); 486 else if (_substrcmp(*av, "flush") == 0) 487 ipfw_flush(g_co.do_force); 488 else if (is_ipfw() && _substrcmp(*av, "zero") == 0) 489 ipfw_zero(ac, av, 0 /* IP_FW_ZERO */); 490 else if (is_ipfw() && _substrcmp(*av, "resetlog") == 0) 491 ipfw_zero(ac, av, 1 /* IP_FW_RESETLOG */); 492 else if (_substrcmp(*av, "print") == 0 || 493 _substrcmp(*av, "list") == 0) 494 ipfw_list(ac, av, do_acct); 495 else if (_substrcmp(*av, "show") == 0) 496 ipfw_list(ac, av, 1 /* show counters */); 497 else if (is_ipfw() && _substrcmp(*av, "table") == 0) 498 ipfw_table_handler(ac, av); 499 else if (is_ipfw() && _substrcmp(*av, "internal") == 0) 500 ipfw_internal_handler(ac, av); 501 else 502 errx(EX_USAGE, "bad command `%s'", *av); 503 } 504 505 /* Free memory allocated in the argument parsing. */ 506 free(save_av); 507 return 0; 508 } 509 510 511 static void 512 ipfw_readfile(int ac, char *av[]) 513 { 514 #define MAX_ARGS 32 515 char buf[4096]; 516 char *progname = av[0]; /* original program name */ 517 const char *cmd = NULL; /* preprocessor name, if any */ 518 const char *filename = av[ac-1]; /* file to read */ 519 int c, lineno=0; 520 FILE *f = NULL; 521 pid_t preproc = 0; 522 523 if (is_ipfw()) { 524 while ((c = getopt(ac, av, "cfNnp:qS")) != -1) { 525 switch(c) { 526 case 'c': 527 g_co.do_compact = 1; 528 break; 529 530 case 'f': 531 g_co.do_force = 1; 532 break; 533 534 case 'N': 535 g_co.do_resolv = 1; 536 break; 537 538 case 'n': 539 g_co.test_only = 1; 540 break; 541 542 case 'p': 543 /* 544 * ipfw -p cmd [args] filename 545 * 546 * We are done with getopt(). All arguments 547 * except the filename go to the preprocessor, 548 * so we need to do the following: 549 * - check that a filename is actually present; 550 * - advance av by optind-1 to skip arguments 551 * already processed; 552 * - decrease ac by optind, to remove the args 553 * already processed and the final filename; 554 * - set the last entry in av[] to NULL so 555 * popen() can detect the end of the array; 556 * - set optind=ac to let getopt() terminate. 557 */ 558 if (optind == ac) 559 errx(EX_USAGE, "no filename argument"); 560 cmd = optarg; 561 av[ac-1] = NULL; 562 av += optind - 1; 563 ac -= optind; 564 optind = ac; 565 break; 566 567 case 'q': 568 g_co.do_quiet = 1; 569 break; 570 571 case 'S': 572 g_co.show_sets = 1; 573 break; 574 575 default: 576 errx(EX_USAGE, "bad arguments, for usage" 577 " summary ``ipfw''"); 578 } 579 } 580 } else { 581 while ((c = getopt(ac, av, "nq")) != -1) { 582 switch(c) { 583 case 'n': 584 g_co.test_only = 1; 585 break; 586 587 case 'q': 588 g_co.do_quiet = 1; 589 break; 590 591 default: 592 errx(EX_USAGE, "bad arguments, for usage" 593 " summary ``dnctl''"); 594 } 595 } 596 } 597 598 if (cmd == NULL && ac != optind + 1) 599 errx(EX_USAGE, "extraneous filename arguments %s", av[ac-1]); 600 601 if ((f = fopen(filename, "r")) == NULL) 602 err(EX_UNAVAILABLE, "fopen: %s", filename); 603 604 if (cmd != NULL) { /* pipe through preprocessor */ 605 int pipedes[2]; 606 607 if (pipe(pipedes) == -1) 608 err(EX_OSERR, "cannot create pipe"); 609 610 preproc = fork(); 611 if (preproc == -1) 612 err(EX_OSERR, "cannot fork"); 613 614 if (preproc == 0) { 615 /* 616 * Child, will run the preprocessor with the 617 * file on stdin and the pipe on stdout. 618 */ 619 if (dup2(fileno(f), 0) == -1 620 || dup2(pipedes[1], 1) == -1) 621 err(EX_OSERR, "dup2()"); 622 fclose(f); 623 close(pipedes[1]); 624 close(pipedes[0]); 625 execvp(cmd, av); 626 err(EX_OSERR, "execvp(%s) failed", cmd); 627 } else { /* parent, will reopen f as the pipe */ 628 fclose(f); 629 close(pipedes[1]); 630 if ((f = fdopen(pipedes[0], "r")) == NULL) { 631 int savederrno = errno; 632 633 (void)kill(preproc, SIGTERM); 634 errno = savederrno; 635 err(EX_OSERR, "fdopen()"); 636 } 637 } 638 } 639 640 while (fgets(buf, sizeof(buf), f)) { /* read commands */ 641 char linename[20]; 642 char *args[2]; 643 644 lineno++; 645 snprintf(linename, sizeof(linename), "Line %d", lineno); 646 setprogname(linename); /* XXX */ 647 args[0] = progname; 648 args[1] = buf; 649 ipfw_main(2, args); 650 } 651 fclose(f); 652 if (cmd != NULL) { 653 int status; 654 655 if (waitpid(preproc, &status, 0) == -1) 656 errx(EX_OSERR, "waitpid()"); 657 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK) 658 errx(EX_UNAVAILABLE, 659 "preprocessor exited with status %d", 660 WEXITSTATUS(status)); 661 else if (WIFSIGNALED(status)) 662 errx(EX_UNAVAILABLE, 663 "preprocessor exited with signal %d", 664 WTERMSIG(status)); 665 } 666 } 667 668 int 669 main(int ac, char *av[]) 670 { 671 #if defined(_WIN32) && defined(TCC) 672 { 673 WSADATA wsaData; 674 int ret=0; 675 unsigned short wVersionRequested = MAKEWORD(2, 2); 676 ret = WSAStartup(wVersionRequested, &wsaData); 677 if (ret != 0) { 678 /* Tell the user that we could not find a usable */ 679 /* Winsock DLL. */ 680 printf("WSAStartup failed with error: %d\n", ret); 681 return 1; 682 } 683 } 684 #endif 685 686 if (strcmp("dnctl", basename(av[0])) == 0) 687 g_co.prog = cmdline_prog_dnctl; 688 else 689 g_co.prog = cmdline_prog_ipfw; 690 691 /* 692 * If the last argument is an absolute pathname, interpret it 693 * as a file to be preprocessed. 694 */ 695 696 if (ac > 1 && av[ac - 1][0] == '/') { 697 if (access(av[ac - 1], R_OK) == 0) 698 ipfw_readfile(ac, av); 699 else 700 err(EX_USAGE, "pathname: %s", av[ac - 1]); 701 } else { 702 if (ipfw_main(ac, av)) { 703 errx(EX_USAGE, 704 "usage: %s [options]\n" 705 "do \"%s -h\" or \"man %s\" for details", av[0], 706 av[0], av[0]); 707 } 708 } 709 return EX_OK; 710 } 711