sbin/ipfw/main.c

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