options.c

   1 /*
   2  * firewall3 - 3rd OpenWrt UCI firewall implementation
   3  *
   4  *   Copyright (C) 2013 Jo-Philipp Wich <jow@openwrt.org>
   5  *
   6  * Permission to use, copy, modify, and/or distribute this software for any
   7  * purpose with or without fee is hereby granted, provided that the above
   8  * copyright notice and this permission notice appear in all copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  17  */
  18
  19 #include "options.h"
  20
  21
  22 static bool
  23 parse_enum(void *ptr, const char *val, const char **values, int min, int max)
  24 {
  25         int i, l = strlen(val);
  26
  27         if (l > 0)
  28         {
  29                 for (i = 0; i <= (max - min); i++)
  30                 {
  31                         if (!strncasecmp(val, values[i], l))
  32                         {
  33                                 *((int *)ptr) = min + i;
  34                                 return true;
  35                         }
  36                 }
  37         }
  38
  39         return false;
  40 }
  41
  42
  43 const char *fw3_flag_names[FW3_DEFAULT_DROP_INVALID + 1] = {
  44         "filter",
  45         "nat",
  46         "mangle",
  47         "raw",
  48
  49         "IPv4",
  50         "IPv6",
  51
  52         "ACCEPT",
  53         "REJECT",
  54         "DROP",
  55         "NOTRACK",
  56         "DNAT",
  57         "SNAT",
  58 };
  59
  60 static const char *limit_units[] = {
  61         "second",
  62         "minute",
  63         "hour",
  64         "day",
  65 };
  66
  67 static const char *ipset_methods[] = {
  68         "bitmap",
  69         "hash",
  70         "list",
  71 };
  72
  73 static const char *ipset_types[] = {
  74         "ip",
  75         "port",
  76         "mac",
  77         "net",
  78         "set",
  79 };
  80
  81 static const char *weekdays[] = {
  82         "monday",
  83         "tuesday",
  84         "wednesday",
  85         "thursday",
  86         "friday",
  87         "saturday",
  88         "sunday",
  89 };
  90
  91 static const char *include_types[] = {
  92         "script",
  93         "restore",
  94 };
  95
  96
  97 bool
  98 fw3_parse_bool(void *ptr, const char *val)
  99 {
 100         if (!strcmp(val, "true") || !strcmp(val, "yes") || !strcmp(val, "1"))
 101                 *((bool *)ptr) = true;
 102         else
 103                 *((bool *)ptr) = false;
 104
 105         return true;
 106 }
 107
 108 bool
 109 fw3_parse_int(void *ptr, const char *val)
 110 {
 111         int n = strtol(val, NULL, 10);
 112
 113         if (errno == ERANGE || errno == EINVAL)
 114                 return false;
 115
 116         *((int *)ptr) = n;
 117
 118         return true;
 119 }
 120
 121 bool
 122 fw3_parse_string(void *ptr, const char *val)
 123 {
 124         *((char **)ptr) = (char *)val;
 125         return true;
 126 }
 127
 128 bool
 129 fw3_parse_target(void *ptr, const char *val)
 130 {
 131         return parse_enum(ptr, val, &fw3_flag_names[FW3_TARGET_ACCEPT],
 132                           FW3_TARGET_ACCEPT, FW3_TARGET_SNAT);
 133 }
 134
 135 bool
 136 fw3_parse_limit(void *ptr, const char *val)
 137 {
 138         struct fw3_limit *limit = ptr;
 139         enum fw3_limit_unit u = FW3_LIMIT_UNIT_SECOND;
 140         char *e;
 141         int n;
 142
 143         if (*val == '!')
 144         {
 145                 limit->invert = true;
 146                 while (isspace(*++val));
 147         }
 148
 149         n = strtol(val, &e, 10);
 150
 151         if (errno == ERANGE || errno == EINVAL)
 152                 return false;
 153
 154         if (*e && *e++ != '/')
 155                 return false;
 156
 157         if (!strlen(e))
 158                 return false;
 159
 160         if (!parse_enum(&u, e, limit_units, 0, FW3_LIMIT_UNIT_DAY))
 161                 return false;
 162
 163         limit->rate = n;
 164         limit->unit = u;
 165
 166         return true;
 167 }
 168
 169 bool
 170 fw3_parse_device(void *ptr, const char *val)
 171 {
 172         struct fw3_device *dev = ptr;
 173
 174         if (*val == '*')
 175         {
 176                 dev->set = true;
 177                 dev->any = true;
 178                 return true;
 179         }
 180
 181         if (*val == '!')
 182         {
 183                 dev->invert = true;
 184                 while (isspace(*++val));
 185         }
 186
 187         if (*val)
 188                 snprintf(dev->name, sizeof(dev->name), "%s", val);
 189         else
 190                 return false;
 191
 192         dev->set = true;
 193         return true;
 194 }
 195
 196 bool
 197 fw3_parse_address(void *ptr, const char *val)
 198 {
 199         struct fw3_address *addr = ptr;
 200         struct in_addr v4;
 201         struct in6_addr v6;
 202         char *p, *s, *e;
 203         int i, m = -1;
 204
 205         if (*val == '!')
 206         {
 207                 addr->invert = true;
 208                 while (isspace(*++val));
 209         }
 210
 211         s = strdup(val);
 212
 213         if (!s)
 214                 return false;
 215
 216         if ((p = strchr(s, '/')) != NULL)
 217         {
 218                 *p++ = 0;
 219                 m = strtoul(p, &e, 10);
 220
 221                 if ((e == p) || (*e != 0))
 222                 {
 223                         if (strchr(s, ':') || !inet_pton(AF_INET, p, &v4))
 224                         {
 225                                 free(s);
 226                                 return false;
 227                         }
 228
 229                         for (i = 0, m = 32; !(v4.s_addr & 1) && (i < 32); i++)
 230                         {
 231                                 m--;
 232                                 v4.s_addr >>= 1;
 233                         }
 234                 }
 235         }
 236         else if ((p = strchr(s, '-')) != NULL)
 237         {
 238                 *p++ = 0;
 239
 240                 if (inet_pton(AF_INET6, p, &v6))
 241                 {
 242                         addr->family = FW3_FAMILY_V6;
 243                         addr->address2.v6 = v6;
 244                         addr->range = true;
 245                 }
 246                 else if (inet_pton(AF_INET, p, &v4))
 247                 {
 248                         addr->family = FW3_FAMILY_V4;
 249                         addr->address2.v4 = v4;
 250                         addr->range = true;
 251                 }
 252                 else
 253                 {
 254                         free(s);
 255                         return false;
 256                 }
 257         }
 258
 259         if (inet_pton(AF_INET6, s, &v6))
 260         {
 261                 addr->family = FW3_FAMILY_V6;
 262                 addr->address.v6 = v6;
 263                 addr->mask = (m >= 0) ? m : 128;
 264         }
 265         else if (inet_pton(AF_INET, s, &v4))
 266         {
 267                 addr->family = FW3_FAMILY_V4;
 268                 addr->address.v4 = v4;
 269                 addr->mask = (m >= 0) ? m : 32;
 270         }
 271         else
 272         {
 273                 free(s);
 274                 return false;
 275         }
 276
 277         free(s);
 278         addr->set = true;
 279         return true;
 280 }
 281
 282 bool
 283 fw3_parse_mac(void *ptr, const char *val)
 284 {
 285         struct fw3_mac *addr = ptr;
 286         struct ether_addr *mac;
 287
 288         if (*val == '!')
 289         {
 290                 addr->invert = true;
 291                 while (isspace(*++val));
 292         }
 293
 294         if ((mac = ether_aton(val)) != NULL)
 295         {
 296                 addr->mac = *mac;
 297                 addr->set = true;
 298                 return true;
 299         }
 300
 301         return false;
 302 }
 303
 304 bool
 305 fw3_parse_port(void *ptr, const char *val)
 306 {
 307         struct fw3_port *range = ptr;
 308         uint16_t n;
 309         uint16_t m;
 310         char *p;
 311
 312         if (*val == '!')
 313         {
 314                 range->invert = true;
 315                 while (isspace(*++val));
 316         }
 317
 318         n = strtoul(val, &p, 10);
 319
 320         if (errno == ERANGE || errno == EINVAL)
 321                 return false;
 322
 323         if (*p && *p != '-' && *p != ':')
 324                 return false;
 325
 326         if (*p)
 327         {
 328                 m = strtoul(++p, NULL, 10);
 329
 330                 if (errno == ERANGE || errno == EINVAL || m < n)
 331                         return false;
 332
 333                 range->port_min = n;
 334                 range->port_max = m;
 335         }
 336         else
 337         {
 338                 range->port_min = n;
 339                 range->port_max = n;
 340         }
 341
 342         range->set = true;
 343         return true;
 344 }
 345
 346 bool
 347 fw3_parse_family(void *ptr, const char *val)
 348 {
 349         if (!strcmp(val, "any"))
 350                 *((enum fw3_family *)ptr) = FW3_FAMILY_ANY;
 351         else if (!strcmp(val, "inet") || strrchr(val, '4'))
 352                 *((enum fw3_family *)ptr) = FW3_FAMILY_V4;
 353         else if (!strcmp(val, "inet6") || strrchr(val, '6'))
 354                 *((enum fw3_family *)ptr) = FW3_FAMILY_V6;
 355         else
 356                 return false;
 357
 358         return true;
 359 }
 360
 361 bool
 362 fw3_parse_icmptype(void *ptr, const char *val)
 363 {
 364         struct fw3_icmptype *icmp = ptr;
 365         bool v4 = false;
 366         bool v6 = false;
 367         char *p;
 368         int i;
 369
 370         for (i = 0; i < ARRAY_SIZE(fw3_icmptype_list_v4); i++)
 371         {
 372                 if (!strcmp(val, fw3_icmptype_list_v4[i].name))
 373                 {
 374                         icmp->type     = fw3_icmptype_list_v4[i].type;
 375                         icmp->code_min = fw3_icmptype_list_v4[i].code_min;
 376                         icmp->code_max = fw3_icmptype_list_v4[i].code_max;
 377
 378                         v4 = true;
 379                         break;
 380                 }
 381         }
 382
 383         for (i = 0; i < ARRAY_SIZE(fw3_icmptype_list_v6); i++)
 384         {
 385                 if (!strcmp(val, fw3_icmptype_list_v6[i].name))
 386                 {
 387                         icmp->type6     = fw3_icmptype_list_v6[i].type;
 388                         icmp->code6_min = fw3_icmptype_list_v6[i].code_min;
 389                         icmp->code6_max = fw3_icmptype_list_v6[i].code_max;
 390
 391                         v6 = true;
 392                         break;
 393                 }
 394         }
 395
 396         if (!v4 && !v6)
 397         {
 398                 i = strtoul(val, &p, 10);
 399
 400                 if ((p == val) || (*p != '/' && *p != 0) || (i > 0xFF))
 401                         return false;
 402
 403                 icmp->type = i;
 404
 405                 if (*p == '/')
 406                 {
 407                         val = ++p;
 408                         i = strtoul(val, &p, 10);
 409
 410                         if ((p == val) || (*p != 0) || (i > 0xFF))
 411                                 return false;
 412
 413                         icmp->code_min = i;
 414                         icmp->code_max = i;
 415                 }
 416                 else
 417                 {
 418                         icmp->code_min = 0;
 419                         icmp->code_max = 0xFF;
 420                 }
 421
 422                 icmp->type6     = icmp->type;
 423                 icmp->code6_min = icmp->code_max;
 424                 icmp->code6_max = icmp->code_max;
 425
 426                 v4 = true;
 427                 v6 = true;
 428         }
 429
 430         icmp->family = (v4 && v6) ? FW3_FAMILY_ANY
 431                                   : (v6 ? FW3_FAMILY_V6 : FW3_FAMILY_V4);
 432
 433         return true;
 434 }
 435
 436 bool
 437 fw3_parse_protocol(void *ptr, const char *val)
 438 {
 439         struct fw3_protocol *proto = ptr;
 440         struct protoent *ent;
 441
 442         if (*val == '!')
 443         {
 444                 proto->invert = true;
 445                 while (isspace(*++val));
 446         }
 447
 448         if (!strcmp(val, "all"))
 449         {
 450                 proto->any = true;
 451                 return true;
 452         }
 453         else if (!strcmp(val, "icmpv6"))
 454         {
 455                 val = "ipv6-icmp";
 456         }
 457
 458         ent = getprotobyname(val);
 459
 460         if (ent)
 461         {
 462                 proto->protocol = ent->p_proto;
 463                 return true;
 464         }
 465
 466         proto->protocol = strtoul(val, NULL, 10);
 467         return (errno != ERANGE && errno != EINVAL);
 468 }
 469
 470 bool
 471 fw3_parse_ipset_method(void *ptr, const char *val)
 472 {
 473         return parse_enum(ptr, val, ipset_methods,
 474                           FW3_IPSET_METHOD_BITMAP, FW3_IPSET_METHOD_LIST);
 475 }
 476
 477 bool
 478 fw3_parse_ipset_datatype(void *ptr, const char *val)
 479 {
 480         struct fw3_ipset_datatype *type = ptr;
 481
 482         if (!strncmp(val, "dest_", 5))
 483         {
 484                 val += 5;
 485                 type->dest = true;
 486         }
 487         else if (!strncmp(val, "dst_", 4))
 488         {
 489                 val += 4;
 490                 type->dest = true;
 491         }
 492         else if (!strncmp(val, "src_", 4))
 493         {
 494                 val += 4;
 495                 type->dest = false;
 496         }
 497
 498         return parse_enum(&type->type, val, ipset_types,
 499                           FW3_IPSET_TYPE_IP, FW3_IPSET_TYPE_SET);
 500 }
 501
 502 bool
 503 fw3_parse_date(void *ptr, const char *val)
 504 {
 505         unsigned int year = 1970, mon = 1, day = 1, hour = 0, min = 0, sec = 0;
 506         struct tm tm = { 0 };
 507         char *p;
 508
 509         year = strtoul(val, &p, 10);
 510         if ((*p != '-' && *p) || year < 1970 || year > 2038)
 511                 goto fail;
 512         else if (!*p)
 513                 goto ret;
 514
 515         mon = strtoul(++p, &p, 10);
 516         if ((*p != '-' && *p) || mon > 12)
 517                 goto fail;
 518         else if (!*p)
 519                 goto ret;
 520
 521         day = strtoul(++p, &p, 10);
 522         if ((*p != 'T' && *p) || day > 31)
 523                 goto fail;
 524         else if (!*p)
 525                 goto ret;
 526
 527         hour = strtoul(++p, &p, 10);
 528         if ((*p != ':' && *p) || hour > 23)
 529                 goto fail;
 530         else if (!*p)
 531                 goto ret;
 532
 533         min = strtoul(++p, &p, 10);
 534         if ((*p != ':' && *p) || min > 59)
 535                 goto fail;
 536         else if (!*p)
 537                 goto ret;
 538
 539         sec = strtoul(++p, &p, 10);
 540         if (*p || sec > 59)
 541                 goto fail;
 542
 543 ret:
 544         tm.tm_year = year - 1900;
 545         tm.tm_mon  = mon - 1;
 546         tm.tm_mday = day;
 547         tm.tm_hour = hour;
 548         tm.tm_min  = min;
 549         tm.tm_sec  = sec;
 550
 551         if (mktime(&tm) >= 0)
 552         {
 553                 *((struct tm *)ptr) = tm;
 554                 return true;
 555         }
 556
 557 fail:
 558         return false;
 559 }
 560
 561 bool
 562 fw3_parse_time(void *ptr, const char *val)
 563 {
 564         unsigned int hour = 0, min = 0, sec = 0;
 565         char *p;
 566
 567         hour = strtoul(val, &p, 10);
 568         if (*p != ':' || hour > 23)
 569                 goto fail;
 570
 571         min = strtoul(++p, &p, 10);
 572         if ((*p != ':' && *p) || min > 59)
 573                 goto fail;
 574         else if (!*p)
 575                 goto ret;
 576
 577         sec = strtoul(++p, &p, 10);
 578         if (*p || sec > 59)
 579                 goto fail;
 580
 581 ret:
 582         *((int *)ptr) = 60 * 60 * hour + 60 * min + sec;
 583         return true;
 584
 585 fail:
 586         return false;
 587 }
 588
 589 bool
 590 fw3_parse_weekdays(void *ptr, const char *val)
 591 {
 592         unsigned int w = 0;
 593         char *p, *s;
 594
 595         if (*val == '!')
 596         {
 597                 setbit(*(uint8_t *)ptr, 0);
 598                 while (isspace(*++val));
 599         }
 600
 601         if (!(s = strdup(val)))
 602                 return false;
 603
 604         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 605         {
 606                 if (!parse_enum(&w, p, weekdays, 1, 7))
 607                 {
 608                         w = strtoul(p, &p, 10);
 609
 610                         if (*p || w < 1 || w > 7)
 611                         {
 612                                 free(s);
 613                                 return false;
 614                         }
 615                 }
 616
 617                 setbit(*(uint8_t *)ptr, w);
 618         }
 619
 620         free(s);
 621         return true;
 622 }
 623
 624 bool
 625 fw3_parse_monthdays(void *ptr, const char *val)
 626 {
 627         unsigned int d;
 628         char *p, *s;
 629
 630         if (*val == '!')
 631         {
 632                 setbit(*(uint32_t *)ptr, 0);
 633                 while (isspace(*++val));
 634         }
 635
 636         if (!(s = strdup(val)))
 637                 return false;
 638
 639         for (p = strtok(s, " \t"); p; p = strtok(NULL, " \t"))
 640         {
 641                 d = strtoul(p, &p, 10);
 642
 643                 if (*p || d < 1 || d > 31)
 644                 {
 645                         free(s);
 646                         return false;
 647                 }
 648
 649                 setbit(*(uint32_t *)ptr, d);
 650         }
 651
 652         free(s);
 653         return true;
 654 }
 655
 656 bool
 657 fw3_parse_include_type(void *ptr, const char *val)
 658 {
 659         return parse_enum(ptr, val, include_types,
 660                           FW3_INC_TYPE_SCRIPT, FW3_INC_TYPE_RESTORE);
 661 }
 662
 663
 664 void
 665 fw3_parse_options(void *s, const struct fw3_option *opts,
 666                   struct uci_section *section)
 667 {
 668         char *p, *v;
 669         bool known;
 670         struct uci_element *e, *l;
 671         struct uci_option *o;
 672         const struct fw3_option *opt;
 673         struct list_head *item;
 674         struct list_head *dest;
 675
 676         uci_foreach_element(&section->options, e)
 677         {
 678                 o = uci_to_option(e);
 679                 known = false;
 680
 681                 for (opt = opts; opt->name; opt++)
 682                 {
 683                         if (!opt->parse)
 684                                 continue;
 685
 686                         if (strcmp(opt->name, e->name))
 687                                 continue;
 688
 689                         if (o->type == UCI_TYPE_LIST)
 690                         {
 691                                 if (!opt->elem_size)
 692                                 {
 693                                         warn_elem(e, "must not be a list");
 694                                 }
 695                                 else
 696                                 {
 697                                         uci_foreach_element(&o->v.list, l)
 698                                         {
 699                                                 if (!l->name)
 700                                                         continue;
 701
 702                                                 item = malloc(opt->elem_size);
 703
 704                                                 if (!item)
 705                                                         continue;
 706
 707                                                 memset(item, 0, opt->elem_size);
 708
 709                                                 if (!opt->parse(item, l->name))
 710                                                 {
 711                                                         warn_elem(e, "has invalid value '%s'", l->name);
 712                                                         free(item);
 713                                                         continue;
 714                                                 }
 715
 716                                                 dest = (struct list_head *)((char *)s + opt->offset);
 717                                                 list_add_tail(item, dest);
 718                                         }
 719                                 }
 720                         }
 721                         else
 722                         {
 723                                 v = o->v.string;
 724
 725                                 if (!v)
 726                                         continue;
 727
 728                                 /* protocol "tcpudp" compatibility hack */
 729                                 if (opt->parse == fw3_parse_protocol && !strcmp(v, "tcpudp"))
 730                                         v = strdup("tcp udp");
 731
 732                                 if (!opt->elem_size)
 733                                 {
 734                                         if (!opt->parse((char *)s + opt->offset, o->v.string))
 735                                                 warn_elem(e, "has invalid value '%s'", o->v.string);
 736                                 }
 737                                 else
 738                                 {
 739                                         for (p = strtok(v, " \t"); p != NULL; p = strtok(NULL, " \t"))
 740                                         {
 741                                                 item = malloc(opt->elem_size);
 742
 743                                                 if (!item)
 744                                                         continue;
 745
 746                                                 memset(item, 0, opt->elem_size);
 747
 748                                                 if (!opt->parse(item, p))
 749                                                 {
 750                                                         warn_elem(e, "has invalid value '%s'", p);
 751                                                         free(item);
 752                                                         continue;
 753                                                 }
 754
 755                                                 dest = (struct list_head *)((char *)s + opt->offset);
 756                                                 list_add_tail(item, dest);
 757                                         }
 758                                 }
 759
 760                                 if (v != o->v.string)
 761                                         free(v);
 762                         }
 763
 764                         known = true;
 765                         break;
 766                 }
 767
 768                 if (!known)
 769                         warn_elem(e, "is unknown");
 770         }
 771 }
 772
 773
 774 void
 775 fw3_format_in_out(struct fw3_device *in, struct fw3_device *out)
 776 {
 777         if (in && !in->any)
 778                 fw3_pr(" %s-i %s", in->invert ? "! " : "", in->name);
 779
 780         if (out && !out->any)
 781                 fw3_pr(" %s-o %s", out->invert ? "! " : "", out->name);
 782 }
 783
 784 void
 785 fw3_format_src_dest(struct fw3_address *src, struct fw3_address *dest)
 786 {
 787         char s[INET6_ADDRSTRLEN];
 788
 789         if ((src && src->range) || (dest && dest->range))
 790                 fw3_pr(" -m iprange");
 791
 792         if (src && src->set)
 793         {
 794                 if (src->range)
 795                 {
 796                         inet_ntop(src->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 797                                           &src->address.v4, s, sizeof(s));
 798
 799                         fw3_pr(" %s--src-range %s", src->invert ? "! " : "", s);
 800
 801                         inet_ntop(src->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 802                                           &src->address2.v4, s, sizeof(s));
 803
 804                         fw3_pr("-%s", s);
 805                 }
 806                 else
 807                 {
 808                         inet_ntop(src->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 809                                           &src->address.v4, s, sizeof(s));
 810
 811                         fw3_pr(" %s-s %s/%u", src->invert ? "! " : "", s, src->mask);
 812                 }
 813         }
 814
 815         if (dest && dest->set)
 816         {
 817                 if (dest->range)
 818                 {
 819                         inet_ntop(dest->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 820                                           &dest->address.v4, s, sizeof(s));
 821
 822                         fw3_pr(" %s--dst-range %s", dest->invert ? "! " : "", s);
 823
 824                         inet_ntop(dest->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 825                                           &dest->address2.v4, s, sizeof(s));
 826
 827                         fw3_pr("-%s", s);
 828                 }
 829                 else
 830                 {
 831                         inet_ntop(dest->family == FW3_FAMILY_V4 ? AF_INET : AF_INET6,
 832                                           &dest->address.v4, s, sizeof(s));
 833
 834                         fw3_pr(" %s-d %s/%u", dest->invert ? "! " : "", s, dest->mask);
 835                 }
 836         }
 837 }
 838
 839 void
 840 fw3_format_sport_dport(struct fw3_port *sp, struct fw3_port *dp)
 841 {
 842         if (sp && sp->set)
 843         {
 844                 if (sp->port_min == sp->port_max)
 845                         fw3_pr(" %s--sport %u", sp->invert ? "! " : "", sp->port_min);
 846                 else
 847                         fw3_pr(" %s--sport %u:%u",
 848                                sp->invert ? "! " : "", sp->port_min, sp->port_max);
 849         }
 850
 851         if (dp && dp->set)
 852         {
 853                 if (dp->port_min == dp->port_max)
 854                         fw3_pr(" %s--dport %u", dp->invert ? "! " : "", dp->port_min);
 855                 else
 856                         fw3_pr(" %s--dport %u:%u",
 857                                dp->invert ? "! " : "", dp->port_min, dp->port_max);
 858         }
 859 }
 860
 861 void
 862 fw3_format_mac(struct fw3_mac *mac)
 863 {
 864         if (!mac)
 865                 return;
 866
 867         fw3_pr(" -m mac %s--mac-source %s",
 868                mac->invert ? "! " : "", ether_ntoa(&mac->mac));
 869 }
 870
 871 void
 872 fw3_format_protocol(struct fw3_protocol *proto, enum fw3_family family)
 873 {
 874         uint16_t pr;
 875
 876         if (!proto)
 877                 return;
 878
 879         pr = proto->protocol;
 880
 881         if (pr == 1 && family == FW3_FAMILY_V6)
 882                 pr = 58;
 883
 884         if (proto->any)
 885                 fw3_pr(" -p all");
 886         else
 887                 fw3_pr(" %s-p %u", proto->invert ? "! " : "", pr);
 888 }
 889
 890 void
 891 fw3_format_icmptype(struct fw3_icmptype *icmp, enum fw3_family family)
 892 {
 893         if (!icmp)
 894                 return;
 895
 896         if (family != FW3_FAMILY_V6)
 897         {
 898                 if (icmp->code_min == 0 && icmp->code_max == 0xFF)
 899                         fw3_pr(" %s--icmp-type %u", icmp->invert ? "! " : "", icmp->type);
 900                 else
 901                         fw3_pr(" %s--icmp-type %u/%u",
 902                                    icmp->invert ? "! " : "", icmp->type, icmp->code_min);
 903         }
 904         else
 905         {
 906                 if (icmp->code6_min == 0 && icmp->code6_max == 0xFF)
 907                         fw3_pr(" %s--icmpv6-type %u", icmp->invert ? "! " : "", icmp->type6);
 908                 else
 909                         fw3_pr(" %s--icmpv6-type %u/%u",
 910                                    icmp->invert ? "! " : "", icmp->type6, icmp->code6_min);
 911         }
 912 }
 913
 914 void
 915 fw3_format_limit(struct fw3_limit *limit)
 916 {
 917         if (!limit)
 918                 return;
 919
 920         if (limit->rate > 0)
 921         {
 922                 fw3_pr(" -m limit %s--limit %u/%s",
 923                        limit->invert ? "! " : "",
 924                        limit->rate, limit_units[limit->unit]);
 925
 926                 if (limit->burst > 0)
 927                         fw3_pr(" --limit-burst %u", limit->burst);
 928         }
 929 }
 930
 931 void
 932 fw3_format_ipset(struct fw3_ipset *ipset, bool invert)
 933 {
 934         bool first = true;
 935         const char *name = NULL;
 936         struct fw3_ipset_datatype *type;
 937
 938         if (!ipset)
 939                 return;
 940
 941         if (ipset->external && *ipset->external)
 942                 name = ipset->external;
 943         else
 944                 name = ipset->name;
 945
 946         fw3_pr(" -m set %s--match-set %s", invert ? "! " : "", name);
 947
 948         list_for_each_entry(type, &ipset->datatypes, list)
 949         {
 950                 fw3_pr("%c%s", first ? ' ' : ',', type->dest ? "dst" : "src");
 951                 first = false;
 952         }
 953 }
 954
 955 void
 956 fw3_format_time(struct fw3_time *time)
 957 {
 958         int i;
 959         struct tm empty = { 0 };
 960         char buf[sizeof("9999-99-99T23:59:59\0")];
 961         bool d1 = memcmp(&time->datestart, &empty, sizeof(empty));
 962         bool d2 = memcmp(&time->datestop, &empty, sizeof(empty));
 963         bool first;
 964
 965         if (!d1 && !d2 && !time->timestart && !time->timestop &&
 966             !(time->monthdays & 0xFFFFFFFE) && !(time->weekdays & 0xFE))
 967         {
 968                 return;
 969         }
 970
 971         fw3_pr(" -m time");
 972
 973         if (time->utc)
 974                 fw3_pr(" --utc");
 975
 976         if (d1)
 977         {
 978                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestart);
 979                 fw3_pr(" --datestart %s", buf);
 980         }
 981
 982         if (d2)
 983         {
 984                 strftime(buf, sizeof(buf), "%Y-%m-%dT%H:%M:%S", &time->datestop);
 985                 fw3_pr(" --datestop %s", buf);
 986         }
 987
 988         if (time->timestart)
 989         {
 990                 fw3_pr(" --timestart %02d:%02d:%02d",
 991                        time->timestart / 3600,
 992                        time->timestart % 3600 / 60,
 993                        time->timestart % 60);
 994         }
 995
 996         if (time->timestop)
 997         {
 998                 fw3_pr(" --timestop %02d:%02d:%02d",
 999                        time->timestop / 3600,
1000                        time->timestop % 3600 / 60,
1001                        time->timestop % 60);
1002         }
1003
1004         if (time->monthdays & 0xFFFFFFFE)
1005         {
1006                 fw3_pr(" %s--monthdays", hasbit(time->monthdays, 0) ? "! " : "");
1007
1008                 for (i = 1, first = true; i < 32; i++)
1009                 {
1010                         if (hasbit(time->monthdays, i))
1011                         {
1012                                 fw3_pr("%c%u", first ? ' ' : ',', i);
1013                                 first = false;
1014                         }
1015                 }
1016         }
1017
1018         if (time->weekdays & 0xFE)
1019         {
1020                 fw3_pr(" %s--weekdays", hasbit(time->weekdays, 0) ? "! " : "");
1021
1022                 for (i = 1, first = true; i < 8; i++)
1023                 {
1024                         if (hasbit(time->weekdays, i))
1025                         {
1026                                 fw3_pr("%c%u", first ? ' ' : ',', i);
1027                                 first = false;
1028                         }
1029                 }
1030         }
1031 }
1032
1033 void
1034 __fw3_format_comment(const char *comment, ...)
1035 {
1036         va_list ap;
1037         int len = 0;
1038         const char *c;
1039
1040         if (!comment || !*comment)
1041                 return;
1042
1043         fw3_pr(" -m comment --comment \"");
1044
1045         c = comment;
1046
1047         va_start(ap, comment);
1048
1049         do
1050         {
1051                 while (*c)
1052                 {
1053                         switch (*c)
1054                         {
1055                         case '"':
1056                         case '$':
1057                         case '`':
1058                         case '\\':
1059                                 fw3_pr("\\");
1060                                 /* fall through */
1061
1062                         default:
1063                                 fw3_pr("%c", *c);
1064                                 break;
1065                         }
1066
1067                         c++;
1068
1069                         if (len++ >= 255)
1070                                 goto end;
1071                 }
1072
1073                 c = va_arg(ap, const char *);
1074         }
1075         while (c);
1076
1077 end:
1078         va_end(ap);
1079         fw3_pr("\"");
1080 }
1081
1082 void
1083 fw3_format_extra(const char *extra)
1084 {
1085         if (!extra || !*extra)
1086                 return;
1087
1088         fw3_pr(" %s", extra);
1089 }