sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002-2003 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  * NEW command line interface for IP firewall facility
  19  *
  20  * $FreeBSD$
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/socket.h>
  25 #include <sys/sockio.h>
  26 #include <sys/sysctl.h>
  27
  28 #include "ipfw2.h"
  29
  30 #include <ctype.h>
  31 #include <err.h>
  32 #include <errno.h>
  33 #include <grp.h>
  34 #include <netdb.h>
  35 #include <pwd.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39 #include <sysexits.h>
  40 #include <time.h>       /* ctime */
  41 #include <timeconv.h>   /* _long_to_time */
  42 #include <unistd.h>
  43 #include <fcntl.h>
  44
  45 #include <net/ethernet.h>
  46 #include <net/if.h>             /* only IFNAMSIZ */
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>   /* only n_short, n_long */
  49 #include <netinet/ip.h>
  50 #include <netinet/ip_icmp.h>
  51 #include <netinet/ip_fw.h>
  52 #include <netinet/tcp.h>
  53 #include <arpa/inet.h>
  54
  55 struct cmdline_opts co; /* global options */
  56
  57 int resvd_set_number = RESVD_SET;
  58
  59 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  60         if (!av[0])                                                     \
  61                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  62         if (_substrcmp(*av, "tablearg") == 0) {                         \
  63                 arg = IP_FW_TABLEARG;                                   \
  64                 break;                                                  \
  65         }                                                               \
  66                                                                         \
  67         {                                                               \
  68         long _xval;                                                     \
  69         char *end;                                                      \
  70                                                                         \
  71         _xval = strtol(*av, &end, 10);                                  \
  72                                                                         \
  73         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  74                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  75                     match_value(s_x, tok), *av);                        \
  76                                                                         \
  77         if (errno == ERANGE || _xval < min || _xval > max)              \
  78                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
  79                     match_value(s_x, tok), min, max, *av);              \
  80                                                                         \
  81         if (_xval == IP_FW_TABLEARG)                                    \
  82                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
  83                     match_value(s_x, tok), *av);                        \
  84         arg = _xval;                                                    \
  85         }                                                               \
  86 } while (0)
  87
  88 static void
  89 PRINT_UINT_ARG(const char *str, uint32_t arg)
  90 {
  91         if (str != NULL)
  92                 printf("%s",str);
  93         if (arg == IP_FW_TABLEARG)
  94                 printf("tablearg");
  95         else
  96                 printf("%u", arg);
  97 }
  98
  99 static struct _s_x f_tcpflags[] = {
 100         { "syn", TH_SYN },
 101         { "fin", TH_FIN },
 102         { "ack", TH_ACK },
 103         { "psh", TH_PUSH },
 104         { "rst", TH_RST },
 105         { "urg", TH_URG },
 106         { "tcp flag", 0 },
 107         { NULL, 0 }
 108 };
 109
 110 static struct _s_x f_tcpopts[] = {
 111         { "mss",        IP_FW_TCPOPT_MSS },
 112         { "maxseg",     IP_FW_TCPOPT_MSS },
 113         { "window",     IP_FW_TCPOPT_WINDOW },
 114         { "sack",       IP_FW_TCPOPT_SACK },
 115         { "ts",         IP_FW_TCPOPT_TS },
 116         { "timestamp",  IP_FW_TCPOPT_TS },
 117         { "cc",         IP_FW_TCPOPT_CC },
 118         { "tcp option", 0 },
 119         { NULL, 0 }
 120 };
 121
 122 /*
 123  * IP options span the range 0 to 255 so we need to remap them
 124  * (though in fact only the low 5 bits are significant).
 125  */
 126 static struct _s_x f_ipopts[] = {
 127         { "ssrr",       IP_FW_IPOPT_SSRR},
 128         { "lsrr",       IP_FW_IPOPT_LSRR},
 129         { "rr",         IP_FW_IPOPT_RR},
 130         { "ts",         IP_FW_IPOPT_TS},
 131         { "ip option",  0 },
 132         { NULL, 0 }
 133 };
 134
 135 static struct _s_x f_iptos[] = {
 136         { "lowdelay",   IPTOS_LOWDELAY},
 137         { "throughput", IPTOS_THROUGHPUT},
 138         { "reliability", IPTOS_RELIABILITY},
 139         { "mincost",    IPTOS_MINCOST},
 140         { "congestion", IPTOS_ECN_CE},
 141         { "ecntransport", IPTOS_ECN_ECT0},
 142         { "ip tos option", 0},
 143         { NULL, 0 }
 144 };
 145
 146 static struct _s_x limit_masks[] = {
 147         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 148         {"src-addr",    DYN_SRC_ADDR},
 149         {"src-port",    DYN_SRC_PORT},
 150         {"dst-addr",    DYN_DST_ADDR},
 151         {"dst-port",    DYN_DST_PORT},
 152         {NULL,          0}
 153 };
 154
 155 /*
 156  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 157  * This is only used in this code.
 158  */
 159 #define IPPROTO_ETHERTYPE       0x1000
 160 static struct _s_x ether_types[] = {
 161     /*
 162      * Note, we cannot use "-:&/" in the names because they are field
 163      * separators in the type specifications. Also, we use s = NULL as
 164      * end-delimiter, because a type of 0 can be legal.
 165      */
 166         { "ip",         0x0800 },
 167         { "ipv4",       0x0800 },
 168         { "ipv6",       0x86dd },
 169         { "arp",        0x0806 },
 170         { "rarp",       0x8035 },
 171         { "vlan",       0x8100 },
 172         { "loop",       0x9000 },
 173         { "trail",      0x1000 },
 174         { "at",         0x809b },
 175         { "atalk",      0x809b },
 176         { "aarp",       0x80f3 },
 177         { "pppoe_disc", 0x8863 },
 178         { "pppoe_sess", 0x8864 },
 179         { "ipx_8022",   0x00E0 },
 180         { "ipx_8023",   0x0000 },
 181         { "ipx_ii",     0x8137 },
 182         { "ipx_snap",   0x8137 },
 183         { "ipx",        0x8137 },
 184         { "ns",         0x0600 },
 185         { NULL,         0 }
 186 };
 187
 188
 189 static struct _s_x rule_actions[] = {
 190         { "accept",             TOK_ACCEPT },
 191         { "pass",               TOK_ACCEPT },
 192         { "allow",              TOK_ACCEPT },
 193         { "permit",             TOK_ACCEPT },
 194         { "count",              TOK_COUNT },
 195         { "pipe",               TOK_PIPE },
 196         { "queue",              TOK_QUEUE },
 197         { "divert",             TOK_DIVERT },
 198         { "tee",                TOK_TEE },
 199         { "netgraph",           TOK_NETGRAPH },
 200         { "ngtee",              TOK_NGTEE },
 201         { "fwd",                TOK_FORWARD },
 202         { "forward",            TOK_FORWARD },
 203         { "skipto",             TOK_SKIPTO },
 204         { "deny",               TOK_DENY },
 205         { "drop",               TOK_DENY },
 206         { "reject",             TOK_REJECT },
 207         { "reset6",             TOK_RESET6 },
 208         { "reset",              TOK_RESET },
 209         { "unreach6",           TOK_UNREACH6 },
 210         { "unreach",            TOK_UNREACH },
 211         { "check-state",        TOK_CHECKSTATE },
 212         { "//",                 TOK_COMMENT },
 213         { "nat",                TOK_NAT },
 214         { "reass",              TOK_REASS },
 215         { "setfib",             TOK_SETFIB },
 216         { NULL, 0 }     /* terminator */
 217 };
 218
 219 static struct _s_x rule_action_params[] = {
 220         { "altq",               TOK_ALTQ },
 221         { "log",                TOK_LOG },
 222         { "tag",                TOK_TAG },
 223         { "untag",              TOK_UNTAG },
 224         { NULL, 0 }     /* terminator */
 225 };
 226
 227 /*
 228  * The 'lookup' instruction accepts one of the following arguments.
 229  * -1 is a terminator for the list.
 230  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 231  */
 232 static int lookup_key[] = {
 233         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 234         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 235
 236 static struct _s_x rule_options[] = {
 237         { "tagged",             TOK_TAGGED },
 238         { "uid",                TOK_UID },
 239         { "gid",                TOK_GID },
 240         { "jail",               TOK_JAIL },
 241         { "in",                 TOK_IN },
 242         { "limit",              TOK_LIMIT },
 243         { "keep-state",         TOK_KEEPSTATE },
 244         { "bridged",            TOK_LAYER2 },
 245         { "layer2",             TOK_LAYER2 },
 246         { "out",                TOK_OUT },
 247         { "diverted",           TOK_DIVERTED },
 248         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 249         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 250         { "xmit",               TOK_XMIT },
 251         { "recv",               TOK_RECV },
 252         { "via",                TOK_VIA },
 253         { "fragment",           TOK_FRAG },
 254         { "frag",               TOK_FRAG },
 255         { "fib",                TOK_FIB },
 256         { "ipoptions",          TOK_IPOPTS },
 257         { "ipopts",             TOK_IPOPTS },
 258         { "iplen",              TOK_IPLEN },
 259         { "ipid",               TOK_IPID },
 260         { "ipprecedence",       TOK_IPPRECEDENCE },
 261         { "dscp",               TOK_DSCP },
 262         { "iptos",              TOK_IPTOS },
 263         { "ipttl",              TOK_IPTTL },
 264         { "ipversion",          TOK_IPVER },
 265         { "ipver",              TOK_IPVER },
 266         { "estab",              TOK_ESTAB },
 267         { "established",        TOK_ESTAB },
 268         { "setup",              TOK_SETUP },
 269         { "tcpdatalen",         TOK_TCPDATALEN },
 270         { "tcpflags",           TOK_TCPFLAGS },
 271         { "tcpflgs",            TOK_TCPFLAGS },
 272         { "tcpoptions",         TOK_TCPOPTS },
 273         { "tcpopts",            TOK_TCPOPTS },
 274         { "tcpseq",             TOK_TCPSEQ },
 275         { "tcpack",             TOK_TCPACK },
 276         { "tcpwin",             TOK_TCPWIN },
 277         { "icmptype",           TOK_ICMPTYPES },
 278         { "icmptypes",          TOK_ICMPTYPES },
 279         { "dst-ip",             TOK_DSTIP },
 280         { "src-ip",             TOK_SRCIP },
 281         { "dst-port",           TOK_DSTPORT },
 282         { "src-port",           TOK_SRCPORT },
 283         { "proto",              TOK_PROTO },
 284         { "MAC",                TOK_MAC },
 285         { "mac",                TOK_MAC },
 286         { "mac-type",           TOK_MACTYPE },
 287         { "verrevpath",         TOK_VERREVPATH },
 288         { "versrcreach",        TOK_VERSRCREACH },
 289         { "antispoof",          TOK_ANTISPOOF },
 290         { "ipsec",              TOK_IPSEC },
 291         { "icmp6type",          TOK_ICMP6TYPES },
 292         { "icmp6types",         TOK_ICMP6TYPES },
 293         { "ext6hdr",            TOK_EXT6HDR},
 294         { "flow-id",            TOK_FLOWID},
 295         { "ipv6",               TOK_IPV6},
 296         { "ip6",                TOK_IPV6},
 297         { "ipv4",               TOK_IPV4},
 298         { "ip4",                TOK_IPV4},
 299         { "dst-ipv6",           TOK_DSTIP6},
 300         { "dst-ip6",            TOK_DSTIP6},
 301         { "src-ipv6",           TOK_SRCIP6},
 302         { "src-ip6",            TOK_SRCIP6},
 303         { "lookup",             TOK_LOOKUP},
 304         { "//",                 TOK_COMMENT },
 305
 306         { "not",                TOK_NOT },              /* pseudo option */
 307         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 308         { "or",                 TOK_OR },               /* pseudo option */
 309         { "|", /* escape */     TOK_OR },               /* pseudo option */
 310         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 311         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 312         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 313         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 314         { NULL, 0 }     /* terminator */
 315 };
 316
 317 /*
 318  * The following is used to generate a printable argument for
 319  * 64-bit numbers, irrespective of platform alignment and bit size.
 320  * Because all the printf in this program use %llu as a format,
 321  * we just return an unsigned long long, which is larger than
 322  * we need in certain cases, but saves the hassle of using
 323  * PRIu64 as a format specifier.
 324  * We don't care about inlining, this is not performance critical code.
 325  */
 326 unsigned long long
 327 align_uint64(const uint64_t *pll)
 328 {
 329         uint64_t ret;
 330
 331         bcopy (pll, &ret, sizeof(ret));
 332         return ret;
 333 }
 334
 335 void *
 336 safe_calloc(size_t number, size_t size)
 337 {
 338         void *ret = calloc(number, size);
 339
 340         if (ret == NULL)
 341                 err(EX_OSERR, "calloc");
 342         return ret;
 343 }
 344
 345 void *
 346 safe_realloc(void *ptr, size_t size)
 347 {
 348         void *ret = realloc(ptr, size);
 349
 350         if (ret == NULL)
 351                 err(EX_OSERR, "realloc");
 352         return ret;
 353 }
 354
 355 /*
 356  * conditionally runs the command.
 357  * Selected options or negative -> getsockopt
 358  */
 359 int
 360 do_cmd(int optname, void *optval, uintptr_t optlen)
 361 {
 362         static int s = -1;      /* the socket */
 363         int i;
 364
 365         if (co.test_only)
 366                 return 0;
 367
 368         if (s == -1)
 369                 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 370         if (s < 0)
 371                 err(EX_UNAVAILABLE, "socket");
 372
 373         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 374             optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST ||
 375             optname == IP_FW_TABLE_GETSIZE ||
 376             optname == IP_FW_NAT_GET_CONFIG ||
 377             optname < 0 ||
 378             optname == IP_FW_NAT_GET_LOG) {
 379                 if (optname < 0)
 380                         optname = -optname;
 381                 i = getsockopt(s, IPPROTO_IP, optname, optval,
 382                         (socklen_t *)optlen);
 383         } else {
 384                 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen);
 385         }
 386         return i;
 387 }
 388
 389 /**
 390  * match_token takes a table and a string, returns the value associated
 391  * with the string (-1 in case of failure).
 392  */
 393 int
 394 match_token(struct _s_x *table, char *string)
 395 {
 396         struct _s_x *pt;
 397         uint i = strlen(string);
 398
 399         for (pt = table ; i && pt->s != NULL ; pt++)
 400                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 401                         return pt->x;
 402         return -1;
 403 }
 404
 405 /**
 406  * match_value takes a table and a value, returns the string associated
 407  * with the value (NULL in case of failure).
 408  */
 409 char const *
 410 match_value(struct _s_x *p, int value)
 411 {
 412         for (; p->s != NULL; p++)
 413                 if (p->x == value)
 414                         return p->s;
 415         return NULL;
 416 }
 417
 418 /*
 419  * _substrcmp takes two strings and returns 1 if they do not match,
 420  * and 0 if they match exactly or the first string is a sub-string
 421  * of the second.  A warning is printed to stderr in the case that the
 422  * first string is a sub-string of the second.
 423  *
 424  * This function will be removed in the future through the usual
 425  * deprecation process.
 426  */
 427 int
 428 _substrcmp(const char *str1, const char* str2)
 429 {
 430
 431         if (strncmp(str1, str2, strlen(str1)) != 0)
 432                 return 1;
 433
 434         if (strlen(str1) != strlen(str2))
 435                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 436                     str1, str2);
 437         return 0;
 438 }
 439
 440 /*
 441  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 442  * and 0 if they match exactly or the second string is a sub-string
 443  * of the first.  A warning is printed to stderr in the case that the
 444  * first string does not match the third.
 445  *
 446  * This function exists to warn about the bizzare construction
 447  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 448  * for "bytes".  The problem is that in addition to accepting "by",
 449  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 450  * other string beginning with "by".
 451  *
 452  * This function will be removed in the future through the usual
 453  * deprecation process.
 454  */
 455 int
 456 _substrcmp2(const char *str1, const char* str2, const char* str3)
 457 {
 458
 459         if (strncmp(str1, str2, strlen(str2)) != 0)
 460                 return 1;
 461
 462         if (strcmp(str1, str3) != 0)
 463                 warnx("DEPRECATED: '%s' matched '%s'",
 464                     str1, str3);
 465         return 0;
 466 }
 467
 468 /*
 469  * prints one port, symbolic or numeric
 470  */
 471 static void
 472 print_port(int proto, uint16_t port)
 473 {
 474
 475         if (proto == IPPROTO_ETHERTYPE) {
 476                 char const *s;
 477
 478                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 479                         printf("%s", s);
 480                 else
 481                         printf("0x%04x", port);
 482         } else {
 483                 struct servent *se = NULL;
 484                 if (co.do_resolv) {
 485                         struct protoent *pe = getprotobynumber(proto);
 486
 487                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 488                 }
 489                 if (se)
 490                         printf("%s", se->s_name);
 491                 else
 492                         printf("%d", port);
 493         }
 494 }
 495
 496 static struct _s_x _port_name[] = {
 497         {"dst-port",    O_IP_DSTPORT},
 498         {"src-port",    O_IP_SRCPORT},
 499         {"ipid",        O_IPID},
 500         {"iplen",       O_IPLEN},
 501         {"ipttl",       O_IPTTL},
 502         {"mac-type",    O_MAC_TYPE},
 503         {"tcpdatalen",  O_TCPDATALEN},
 504         {"tagged",      O_TAGGED},
 505         {NULL,          0}
 506 };
 507
 508 /*
 509  * Print the values in a list 16-bit items of the types above.
 510  * XXX todo: add support for mask.
 511  */
 512 static void
 513 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 514 {
 515         uint16_t *p = cmd->ports;
 516         int i;
 517         char const *sep;
 518
 519         if (opcode != 0) {
 520                 sep = match_value(_port_name, opcode);
 521                 if (sep == NULL)
 522                         sep = "???";
 523                 printf (" %s", sep);
 524         }
 525         sep = " ";
 526         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 527                 printf("%s", sep);
 528                 print_port(proto, p[0]);
 529                 if (p[0] != p[1]) {
 530                         printf("-");
 531                         print_port(proto, p[1]);
 532                 }
 533                 sep = ",";
 534         }
 535 }
 536
 537 /*
 538  * Like strtol, but also translates service names into port numbers
 539  * for some protocols.
 540  * In particular:
 541  *      proto == -1 disables the protocol check;
 542  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 543  *      proto == <some value in /etc/protocols> matches the values there.
 544  * Returns *end == s in case the parameter is not found.
 545  */
 546 static int
 547 strtoport(char *s, char **end, int base, int proto)
 548 {
 549         char *p, *buf;
 550         char *s1;
 551         int i;
 552
 553         *end = s;               /* default - not found */
 554         if (*s == '\0')
 555                 return 0;       /* not found */
 556
 557         if (isdigit(*s))
 558                 return strtol(s, end, base);
 559
 560         /*
 561          * find separator. '\\' escapes the next char.
 562          */
 563         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 564                 if (*s1 == '\\' && s1[1] != '\0')
 565                         s1++;
 566
 567         buf = safe_calloc(s1 - s + 1, 1);
 568
 569         /*
 570          * copy into a buffer skipping backslashes
 571          */
 572         for (p = s, i = 0; p != s1 ; p++)
 573                 if (*p != '\\')
 574                         buf[i++] = *p;
 575         buf[i++] = '\0';
 576
 577         if (proto == IPPROTO_ETHERTYPE) {
 578                 i = match_token(ether_types, buf);
 579                 free(buf);
 580                 if (i != -1) {  /* found */
 581                         *end = s1;
 582                         return i;
 583                 }
 584         } else {
 585                 struct protoent *pe = NULL;
 586                 struct servent *se;
 587
 588                 if (proto != 0)
 589                         pe = getprotobynumber(proto);
 590                 setservent(1);
 591                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 592                 free(buf);
 593                 if (se != NULL) {
 594                         *end = s1;
 595                         return ntohs(se->s_port);
 596                 }
 597         }
 598         return 0;       /* not found */
 599 }
 600
 601 /*
 602  * Fill the body of the command with the list of port ranges.
 603  */
 604 static int
 605 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 606 {
 607         uint16_t a, b, *p = cmd->ports;
 608         int i = 0;
 609         char *s = av;
 610
 611         while (*s) {
 612                 a = strtoport(av, &s, 0, proto);
 613                 if (s == av)                    /* empty or invalid argument */
 614                         return (0);
 615
 616                 switch (*s) {
 617                 case '-':                       /* a range */
 618                         av = s + 1;
 619                         b = strtoport(av, &s, 0, proto);
 620                         /* Reject expressions like '1-abc' or '1-2-3'. */
 621                         if (s == av || (*s != ',' && *s != '\0'))
 622                                 return (0);
 623                         p[0] = a;
 624                         p[1] = b;
 625                         break;
 626                 case ',':                       /* comma separated list */
 627                 case '\0':
 628                         p[0] = p[1] = a;
 629                         break;
 630                 default:
 631                         warnx("port list: invalid separator <%c> in <%s>",
 632                                 *s, av);
 633                         return (0);
 634                 }
 635
 636                 i++;
 637                 p += 2;
 638                 av = s + 1;
 639         }
 640         if (i > 0) {
 641                 if (i + 1 > F_LEN_MASK)
 642                         errx(EX_DATAERR, "too many ports/ranges\n");
 643                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 644         }
 645         return (i);
 646 }
 647
 648 static struct _s_x icmpcodes[] = {
 649       { "net",                  ICMP_UNREACH_NET },
 650       { "host",                 ICMP_UNREACH_HOST },
 651       { "protocol",             ICMP_UNREACH_PROTOCOL },
 652       { "port",                 ICMP_UNREACH_PORT },
 653       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 654       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 655       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 656       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 657       { "isolated",             ICMP_UNREACH_ISOLATED },
 658       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 659       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 660       { "tosnet",               ICMP_UNREACH_TOSNET },
 661       { "toshost",              ICMP_UNREACH_TOSHOST },
 662       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 663       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 664       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 665       { NULL, 0 }
 666 };
 667
 668 static void
 669 fill_reject_code(u_short *codep, char *str)
 670 {
 671         int val;
 672         char *s;
 673
 674         val = strtoul(str, &s, 0);
 675         if (s == str || *s != '\0' || val >= 0x100)
 676                 val = match_token(icmpcodes, str);
 677         if (val < 0)
 678                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 679         *codep = val;
 680         return;
 681 }
 682
 683 static void
 684 print_reject_code(uint16_t code)
 685 {
 686         char const *s = match_value(icmpcodes, code);
 687
 688         if (s != NULL)
 689                 printf("unreach %s", s);
 690         else
 691                 printf("unreach %u", code);
 692 }
 693
 694 /*
 695  * Returns the number of bits set (from left) in a contiguous bitmask,
 696  * or -1 if the mask is not contiguous.
 697  * XXX this needs a proper fix.
 698  * This effectively works on masks in big-endian (network) format.
 699  * when compiled on little endian architectures.
 700  *
 701  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 702  * the first bit on the wire is bit 0 of the first byte.
 703  * len is the max length in bits.
 704  */
 705 int
 706 contigmask(uint8_t *p, int len)
 707 {
 708         int i, n;
 709
 710         for (i=0; i<len ; i++)
 711                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 712                         break;
 713         for (n=i+1; n < len; n++)
 714                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 715                         return -1; /* mask not contiguous */
 716         return i;
 717 }
 718
 719 /*
 720  * print flags set/clear in the two bitmasks passed as parameters.
 721  * There is a specialized check for f_tcpflags.
 722  */
 723 static void
 724 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 725 {
 726         char const *comma = "";
 727         int i;
 728         uint8_t set = cmd->arg1 & 0xff;
 729         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 730
 731         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 732                 printf(" setup");
 733                 return;
 734         }
 735
 736         printf(" %s ", name);
 737         for (i=0; list[i].x != 0; i++) {
 738                 if (set & list[i].x) {
 739                         set &= ~list[i].x;
 740                         printf("%s%s", comma, list[i].s);
 741                         comma = ",";
 742                 }
 743                 if (clear & list[i].x) {
 744                         clear &= ~list[i].x;
 745                         printf("%s!%s", comma, list[i].s);
 746                         comma = ",";
 747                 }
 748         }
 749 }
 750
 751 /*
 752  * Print the ip address contained in a command.
 753  */
 754 static void
 755 print_ip(ipfw_insn_ip *cmd, char const *s)
 756 {
 757         struct hostent *he = NULL;
 758         uint32_t len = F_LEN((ipfw_insn *)cmd);
 759         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 760
 761         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 762                 uint32_t d = a[1];
 763                 const char *arg = "<invalid>";
 764
 765                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 766                         arg = match_value(rule_options, lookup_key[d]);
 767                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 768                         arg, cmd->o.arg1);
 769                 return;
 770         }
 771         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 772
 773         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 774                 printf("me");
 775                 return;
 776         }
 777         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 778             cmd->o.opcode == O_IP_DST_LOOKUP) {
 779                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 780                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 781                         printf(",%u", *a);
 782                 printf(")");
 783                 return;
 784         }
 785         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 786                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 787                 int i, j;
 788                 char comma = '{';
 789
 790                 x = cmd->o.arg1 - 1;
 791                 x = htonl( ~x );
 792                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 793                 printf("%s/%d", inet_ntoa(cmd->addr),
 794                         contigmask((uint8_t *)&x, 32));
 795                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 796                 x &= 0xff; /* base */
 797                 /*
 798                  * Print bits and ranges.
 799                  * Locate first bit set (i), then locate first bit unset (j).
 800                  * If we have 3+ consecutive bits set, then print them as a
 801                  * range, otherwise only print the initial bit and rescan.
 802                  */
 803                 for (i=0; i < cmd->o.arg1; i++)
 804                         if (map[i/32] & (1<<(i & 31))) {
 805                                 for (j=i+1; j < cmd->o.arg1; j++)
 806                                         if (!(map[ j/32] & (1<<(j & 31))))
 807                                                 break;
 808                                 printf("%c%d", comma, i+x);
 809                                 if (j>i+2) { /* range has at least 3 elements */
 810                                         printf("-%d", j-1+x);
 811                                         i = j-1;
 812                                 }
 813                                 comma = ',';
 814                         }
 815                 printf("}");
 816                 return;
 817         }
 818         /*
 819          * len == 2 indicates a single IP, whereas lists of 1 or more
 820          * addr/mask pairs have len = (2n+1). We convert len to n so we
 821          * use that to count the number of entries.
 822          */
 823     for (len = len / 2; len > 0; len--, a += 2) {
 824         int mb =        /* mask length */
 825             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 826                 32 : contigmask((uint8_t *)&(a[1]), 32);
 827         if (mb == 32 && co.do_resolv)
 828                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 829         if (he != NULL)         /* resolved to name */
 830                 printf("%s", he->h_name);
 831         else if (mb == 0)       /* any */
 832                 printf("any");
 833         else {          /* numeric IP followed by some kind of mask */
 834                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 835                 if (mb < 0)
 836                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 837                 else if (mb < 32)
 838                         printf("/%d", mb);
 839         }
 840         if (len > 1)
 841                 printf(",");
 842     }
 843 }
 844
 845 /*
 846  * prints a MAC address/mask pair
 847  */
 848 static void
 849 print_mac(uint8_t *addr, uint8_t *mask)
 850 {
 851         int l = contigmask(mask, 48);
 852
 853         if (l == 0)
 854                 printf(" any");
 855         else {
 856                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 857                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 858                 if (l == -1)
 859                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 860                             mask[0], mask[1], mask[2],
 861                             mask[3], mask[4], mask[5]);
 862                 else if (l < 48)
 863                         printf("/%d", l);
 864         }
 865 }
 866
 867 static void
 868 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 869 {
 870         uint8_t type;
 871
 872         cmd->d[0] = 0;
 873         while (*av) {
 874                 if (*av == ',')
 875                         av++;
 876
 877                 type = strtoul(av, &av, 0);
 878
 879                 if (*av != ',' && *av != '\0')
 880                         errx(EX_DATAERR, "invalid ICMP type");
 881
 882                 if (type > 31)
 883                         errx(EX_DATAERR, "ICMP type out of range");
 884
 885                 cmd->d[0] |= 1 << type;
 886         }
 887         cmd->o.opcode = O_ICMPTYPE;
 888         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 889 }
 890
 891 static void
 892 print_icmptypes(ipfw_insn_u32 *cmd)
 893 {
 894         int i;
 895         char sep= ' ';
 896
 897         printf(" icmptypes");
 898         for (i = 0; i < 32; i++) {
 899                 if ( (cmd->d[0] & (1 << (i))) == 0)
 900                         continue;
 901                 printf("%c%d", sep, i);
 902                 sep = ',';
 903         }
 904 }
 905
 906 /*
 907  * show_ipfw() prints the body of an ipfw rule.
 908  * Because the standard rule has at least proto src_ip dst_ip, we use
 909  * a helper function to produce these entries if not provided explicitly.
 910  * The first argument is the list of fields we have, the second is
 911  * the list of fields we want to be printed.
 912  *
 913  * Special cases if we have provided a MAC header:
 914  *   + if the rule does not contain IP addresses/ports, do not print them;
 915  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 916  *
 917  * Once we have 'have_options', IP header fields are printed as options.
 918  */
 919 #define HAVE_PROTO      0x0001
 920 #define HAVE_SRCIP      0x0002
 921 #define HAVE_DSTIP      0x0004
 922 #define HAVE_PROTO4     0x0008
 923 #define HAVE_PROTO6     0x0010
 924 #define HAVE_IP         0x0100
 925 #define HAVE_OPTIONS    0x8000
 926
 927 static void
 928 show_prerequisites(int *flags, int want, int cmd __unused)
 929 {
 930         if (co.comment_only)
 931                 return;
 932         if ( (*flags & HAVE_IP) == HAVE_IP)
 933                 *flags |= HAVE_OPTIONS;
 934
 935         if ( !(*flags & HAVE_OPTIONS)) {
 936                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
 937                         if ( (*flags & HAVE_PROTO4))
 938                                 printf(" ip4");
 939                         else if ( (*flags & HAVE_PROTO6))
 940                                 printf(" ip6");
 941                         else
 942                                 printf(" ip");
 943                 }
 944                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 945                         printf(" from any");
 946                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 947                         printf(" to any");
 948         }
 949         *flags |= want;
 950 }
 951
 952 static void
 953 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 954 {
 955         static int twidth = 0;
 956         int l;
 957         ipfw_insn *cmd, *tagptr = NULL;
 958         const char *comment = NULL;     /* ptr to comment if we have one */
 959         int proto = 0;          /* default */
 960         int flags = 0;  /* prerequisites */
 961         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 962         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
 963         int or_block = 0;       /* we are in an or block */
 964         uint32_t set_disable;
 965
 966         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
 967
 968         if (set_disable & (1 << rule->set)) { /* disabled */
 969                 if (!co.show_sets)
 970                         return;
 971                 else
 972                         printf("# DISABLED ");
 973         }
 974         printf("%05u ", rule->rulenum);
 975
 976         if (pcwidth>0 || bcwidth>0)
 977                 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt),
 978                     bcwidth, align_uint64(&rule->bcnt));
 979
 980         if (co.do_time == 2)
 981                 printf("%10u ", rule->timestamp);
 982         else if (co.do_time == 1) {
 983                 char timestr[30];
 984                 time_t t = (time_t)0;
 985
 986                 if (twidth == 0) {
 987                         strcpy(timestr, ctime(&t));
 988                         *strchr(timestr, '\n') = '\0';
 989                         twidth = strlen(timestr);
 990                 }
 991                 if (rule->timestamp) {
 992                         t = _long_to_time(rule->timestamp);
 993
 994                         strcpy(timestr, ctime(&t));
 995                         *strchr(timestr, '\n') = '\0';
 996                         printf("%s ", timestr);
 997                 } else {
 998                         printf("%*s", twidth, " ");
 999                 }
1000         }
1001
1002         if (co.show_sets)
1003                 printf("set %d ", rule->set);
1004
1005         /*
1006          * print the optional "match probability"
1007          */
1008         if (rule->cmd_len > 0) {
1009                 cmd = rule->cmd ;
1010                 if (cmd->opcode == O_PROB) {
1011                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1012                         double d = 1.0 * p->d[0];
1013
1014                         d = (d / 0x7fffffff);
1015                         printf("prob %f ", d);
1016                 }
1017         }
1018
1019         /*
1020          * first print actions
1021          */
1022         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1023                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1024                 switch(cmd->opcode) {
1025                 case O_CHECK_STATE:
1026                         printf("check-state");
1027                         /* avoid printing anything else */
1028                         flags = HAVE_PROTO | HAVE_SRCIP |
1029                                 HAVE_DSTIP | HAVE_IP;
1030                         break;
1031
1032                 case O_ACCEPT:
1033                         printf("allow");
1034                         break;
1035
1036                 case O_COUNT:
1037                         printf("count");
1038                         break;
1039
1040                 case O_DENY:
1041                         printf("deny");
1042                         break;
1043
1044                 case O_REJECT:
1045                         if (cmd->arg1 == ICMP_REJECT_RST)
1046                                 printf("reset");
1047                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1048                                 printf("reject");
1049                         else
1050                                 print_reject_code(cmd->arg1);
1051                         break;
1052
1053                 case O_UNREACH6:
1054                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1055                                 printf("reset6");
1056                         else
1057                                 print_unreach6_code(cmd->arg1);
1058                         break;
1059
1060                 case O_SKIPTO:
1061                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1062                         break;
1063
1064                 case O_PIPE:
1065                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1066                         break;
1067
1068                 case O_QUEUE:
1069                         PRINT_UINT_ARG("queue ", cmd->arg1);
1070                         break;
1071
1072                 case O_DIVERT:
1073                         PRINT_UINT_ARG("divert ", cmd->arg1);
1074                         break;
1075
1076                 case O_TEE:
1077                         PRINT_UINT_ARG("tee ", cmd->arg1);
1078                         break;
1079
1080                 case O_NETGRAPH:
1081                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1082                         break;
1083
1084                 case O_NGTEE:
1085                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1086                         break;
1087
1088                 case O_FORWARD_IP:
1089                     {
1090                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1091
1092                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1093                                 printf("fwd tablearg");
1094                         } else {
1095                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1096                         }
1097                         if (s->sa.sin_port)
1098                                 printf(",%d", s->sa.sin_port);
1099                     }
1100                         break;
1101
1102                 case O_LOG: /* O_LOG is printed last */
1103                         logptr = (ipfw_insn_log *)cmd;
1104                         break;
1105
1106                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1107                         altqptr = (ipfw_insn_altq *)cmd;
1108                         break;
1109
1110                 case O_TAG:
1111                         tagptr = cmd;
1112                         break;
1113
1114                 case O_NAT:
1115                         PRINT_UINT_ARG("nat ", cmd->arg1);
1116                         break;
1117
1118                 case O_SETFIB:
1119                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1120                         break;
1121
1122                 case O_REASS:
1123                         printf("reass");
1124                         break;
1125
1126                 default:
1127                         printf("** unrecognized action %d len %d ",
1128                                 cmd->opcode, cmd->len);
1129                 }
1130         }
1131         if (logptr) {
1132                 if (logptr->max_log > 0)
1133                         printf(" log logamount %d", logptr->max_log);
1134                 else
1135                         printf(" log");
1136         }
1137 #ifndef NO_ALTQ
1138         if (altqptr) {
1139                 print_altq_cmd(altqptr);
1140         }
1141 #endif
1142         if (tagptr) {
1143                 if (tagptr->len & F_NOT)
1144                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1145                 else
1146                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1147         }
1148
1149         /*
1150          * then print the body.
1151          */
1152         for (l = rule->act_ofs, cmd = rule->cmd ;
1153                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1154                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1155                         continue;
1156                 if (cmd->opcode == O_IP4) {
1157                         flags |= HAVE_PROTO4;
1158                         break;
1159                 } else if (cmd->opcode == O_IP6) {
1160                         flags |= HAVE_PROTO6;
1161                         break;
1162                 }
1163         }
1164         if (rule->_pad & 1) {   /* empty rules before options */
1165                 if (!co.do_compact) {
1166                         show_prerequisites(&flags, HAVE_PROTO, 0);
1167                         printf(" from any to any");
1168                 }
1169                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1170                          HAVE_SRCIP | HAVE_DSTIP;
1171         }
1172
1173         if (co.comment_only)
1174                 comment = "...";
1175
1176         for (l = rule->act_ofs, cmd = rule->cmd ;
1177                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1178                 /* useful alias */
1179                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1180
1181                 if (co.comment_only) {
1182                         if (cmd->opcode != O_NOP)
1183                                 continue;
1184                         printf(" // %s\n", (char *)(cmd + 1));
1185                         return;
1186                 }
1187
1188                 show_prerequisites(&flags, 0, cmd->opcode);
1189
1190                 switch(cmd->opcode) {
1191                 case O_PROB:
1192                         break;  /* done already */
1193
1194                 case O_PROBE_STATE:
1195                         break; /* no need to print anything here */
1196
1197                 case O_IP_SRC:
1198                 case O_IP_SRC_LOOKUP:
1199                 case O_IP_SRC_MASK:
1200                 case O_IP_SRC_ME:
1201                 case O_IP_SRC_SET:
1202                         show_prerequisites(&flags, HAVE_PROTO, 0);
1203                         if (!(flags & HAVE_SRCIP))
1204                                 printf(" from");
1205                         if ((cmd->len & F_OR) && !or_block)
1206                                 printf(" {");
1207                         print_ip((ipfw_insn_ip *)cmd,
1208                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1209                         flags |= HAVE_SRCIP;
1210                         break;
1211
1212                 case O_IP_DST:
1213                 case O_IP_DST_LOOKUP:
1214                 case O_IP_DST_MASK:
1215                 case O_IP_DST_ME:
1216                 case O_IP_DST_SET:
1217                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1218                         if (!(flags & HAVE_DSTIP))
1219                                 printf(" to");
1220                         if ((cmd->len & F_OR) && !or_block)
1221                                 printf(" {");
1222                         print_ip((ipfw_insn_ip *)cmd,
1223                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1224                         flags |= HAVE_DSTIP;
1225                         break;
1226
1227                 case O_IP6_SRC:
1228                 case O_IP6_SRC_MASK:
1229                 case O_IP6_SRC_ME:
1230                         show_prerequisites(&flags, HAVE_PROTO, 0);
1231                         if (!(flags & HAVE_SRCIP))
1232                                 printf(" from");
1233                         if ((cmd->len & F_OR) && !or_block)
1234                                 printf(" {");
1235                         print_ip6((ipfw_insn_ip6 *)cmd,
1236                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1237                         flags |= HAVE_SRCIP | HAVE_PROTO;
1238                         break;
1239
1240                 case O_IP6_DST:
1241                 case O_IP6_DST_MASK:
1242                 case O_IP6_DST_ME:
1243                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1244                         if (!(flags & HAVE_DSTIP))
1245                                 printf(" to");
1246                         if ((cmd->len & F_OR) && !or_block)
1247                                 printf(" {");
1248                         print_ip6((ipfw_insn_ip6 *)cmd,
1249                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1250                         flags |= HAVE_DSTIP;
1251                         break;
1252
1253                 case O_FLOW6ID:
1254                 print_flow6id( (ipfw_insn_u32 *) cmd );
1255                 flags |= HAVE_OPTIONS;
1256                 break;
1257
1258                 case O_IP_DSTPORT:
1259                         show_prerequisites(&flags,
1260                                 HAVE_PROTO | HAVE_SRCIP |
1261                                 HAVE_DSTIP | HAVE_IP, 0);
1262                 case O_IP_SRCPORT:
1263                         show_prerequisites(&flags,
1264                                 HAVE_PROTO | HAVE_SRCIP, 0);
1265                         if ((cmd->len & F_OR) && !or_block)
1266                                 printf(" {");
1267                         if (cmd->len & F_NOT)
1268                                 printf(" not");
1269                         print_newports((ipfw_insn_u16 *)cmd, proto,
1270                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1271                         break;
1272
1273                 case O_PROTO: {
1274                         struct protoent *pe = NULL;
1275
1276                         if ((cmd->len & F_OR) && !or_block)
1277                                 printf(" {");
1278                         if (cmd->len & F_NOT)
1279                                 printf(" not");
1280                         proto = cmd->arg1;
1281                         pe = getprotobynumber(cmd->arg1);
1282                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1283                             !(flags & HAVE_PROTO))
1284                                 show_prerequisites(&flags,
1285                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1286                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1287                         if (flags & HAVE_OPTIONS)
1288                                 printf(" proto");
1289                         if (pe)
1290                                 printf(" %s", pe->p_name);
1291                         else
1292                                 printf(" %u", cmd->arg1);
1293                         }
1294                         flags |= HAVE_PROTO;
1295                         break;
1296
1297                 default: /*options ... */
1298                         if (!(cmd->len & (F_OR|F_NOT)))
1299                                 if (((cmd->opcode == O_IP6) &&
1300                                     (flags & HAVE_PROTO6)) ||
1301                                     ((cmd->opcode == O_IP4) &&
1302                                     (flags & HAVE_PROTO4)))
1303                                         break;
1304                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1305                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1306                         if ((cmd->len & F_OR) && !or_block)
1307                                 printf(" {");
1308                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1309                                 printf(" not");
1310                         switch(cmd->opcode) {
1311                         case O_MACADDR2: {
1312                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1313
1314                                 printf(" MAC");
1315                                 print_mac(m->addr, m->mask);
1316                                 print_mac(m->addr + 6, m->mask + 6);
1317                                 }
1318                                 break;
1319
1320                         case O_MAC_TYPE:
1321                                 print_newports((ipfw_insn_u16 *)cmd,
1322                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1323                                 break;
1324
1325
1326                         case O_FRAG:
1327                                 printf(" frag");
1328                                 break;
1329
1330                         case O_FIB:
1331                                 printf(" fib %u", cmd->arg1 );
1332                                 break;
1333
1334                         case O_IN:
1335                                 printf(cmd->len & F_NOT ? " out" : " in");
1336                                 break;
1337
1338                         case O_DIVERTED:
1339                                 switch (cmd->arg1) {
1340                                 case 3:
1341                                         printf(" diverted");
1342                                         break;
1343                                 case 1:
1344                                         printf(" diverted-loopback");
1345                                         break;
1346                                 case 2:
1347                                         printf(" diverted-output");
1348                                         break;
1349                                 default:
1350                                         printf(" diverted-?<%u>", cmd->arg1);
1351                                         break;
1352                                 }
1353                                 break;
1354
1355                         case O_LAYER2:
1356                                 printf(" layer2");
1357                                 break;
1358                         case O_XMIT:
1359                         case O_RECV:
1360                         case O_VIA:
1361                             {
1362                                 char const *s;
1363                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1364
1365                                 if (cmd->opcode == O_XMIT)
1366                                         s = "xmit";
1367                                 else if (cmd->opcode == O_RECV)
1368                                         s = "recv";
1369                                 else /* if (cmd->opcode == O_VIA) */
1370                                         s = "via";
1371                                 if (cmdif->name[0] == '\0')
1372                                         printf(" %s %s", s,
1373                                             inet_ntoa(cmdif->p.ip));
1374                                 else
1375                                         printf(" %s %s", s, cmdif->name);
1376
1377                                 break;
1378                             }
1379                         case O_IPID:
1380                                 if (F_LEN(cmd) == 1)
1381                                     printf(" ipid %u", cmd->arg1 );
1382                                 else
1383                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1384                                         O_IPID);
1385                                 break;
1386
1387                         case O_IPTTL:
1388                                 if (F_LEN(cmd) == 1)
1389                                     printf(" ipttl %u", cmd->arg1 );
1390                                 else
1391                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1392                                         O_IPTTL);
1393                                 break;
1394
1395                         case O_IPVER:
1396                                 printf(" ipver %u", cmd->arg1 );
1397                                 break;
1398
1399                         case O_IPPRECEDENCE:
1400                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1401                                 break;
1402
1403                         case O_IPLEN:
1404                                 if (F_LEN(cmd) == 1)
1405                                     printf(" iplen %u", cmd->arg1 );
1406                                 else
1407                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1408                                         O_IPLEN);
1409                                 break;
1410
1411                         case O_IPOPT:
1412                                 print_flags("ipoptions", cmd, f_ipopts);
1413                                 break;
1414
1415                         case O_IPTOS:
1416                                 print_flags("iptos", cmd, f_iptos);
1417                                 break;
1418
1419                         case O_ICMPTYPE:
1420                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1421                                 break;
1422
1423                         case O_ESTAB:
1424                                 printf(" established");
1425                                 break;
1426
1427                         case O_TCPDATALEN:
1428                                 if (F_LEN(cmd) == 1)
1429                                     printf(" tcpdatalen %u", cmd->arg1 );
1430                                 else
1431                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1432                                         O_TCPDATALEN);
1433                                 break;
1434
1435                         case O_TCPFLAGS:
1436                                 print_flags("tcpflags", cmd, f_tcpflags);
1437                                 break;
1438
1439                         case O_TCPOPTS:
1440                                 print_flags("tcpoptions", cmd, f_tcpopts);
1441                                 break;
1442
1443                         case O_TCPWIN:
1444                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1445                                 break;
1446
1447                         case O_TCPACK:
1448                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1449                                 break;
1450
1451                         case O_TCPSEQ:
1452                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1453                                 break;
1454
1455                         case O_UID:
1456                             {
1457                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1458
1459                                 if (pwd)
1460                                         printf(" uid %s", pwd->pw_name);
1461                                 else
1462                                         printf(" uid %u", cmd32->d[0]);
1463                             }
1464                                 break;
1465
1466                         case O_GID:
1467                             {
1468                                 struct group *grp = getgrgid(cmd32->d[0]);
1469
1470                                 if (grp)
1471                                         printf(" gid %s", grp->gr_name);
1472                                 else
1473                                         printf(" gid %u", cmd32->d[0]);
1474                             }
1475                                 break;
1476
1477                         case O_JAIL:
1478                                 printf(" jail %d", cmd32->d[0]);
1479                                 break;
1480
1481                         case O_VERREVPATH:
1482                                 printf(" verrevpath");
1483                                 break;
1484
1485                         case O_VERSRCREACH:
1486                                 printf(" versrcreach");
1487                                 break;
1488
1489                         case O_ANTISPOOF:
1490                                 printf(" antispoof");
1491                                 break;
1492
1493                         case O_IPSEC:
1494                                 printf(" ipsec");
1495                                 break;
1496
1497                         case O_NOP:
1498                                 comment = (char *)(cmd + 1);
1499                                 break;
1500
1501                         case O_KEEP_STATE:
1502                                 printf(" keep-state");
1503                                 break;
1504
1505                         case O_LIMIT: {
1506                                 struct _s_x *p = limit_masks;
1507                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1508                                 uint8_t x = c->limit_mask;
1509                                 char const *comma = " ";
1510
1511                                 printf(" limit");
1512                                 for (; p->x != 0 ; p++)
1513                                         if ((x & p->x) == p->x) {
1514                                                 x &= ~p->x;
1515                                                 printf("%s%s", comma, p->s);
1516                                                 comma = ",";
1517                                         }
1518                                 PRINT_UINT_ARG(" ", c->conn_limit);
1519                                 break;
1520                         }
1521
1522                         case O_IP6:
1523                                 printf(" ip6");
1524                                 break;
1525
1526                         case O_IP4:
1527                                 printf(" ip4");
1528                                 break;
1529
1530                         case O_ICMP6TYPE:
1531                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1532                                 break;
1533
1534                         case O_EXT_HDR:
1535                                 print_ext6hdr( (ipfw_insn *) cmd );
1536                                 break;
1537
1538                         case O_TAGGED:
1539                                 if (F_LEN(cmd) == 1)
1540                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1541                                 else
1542                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1543                                             O_TAGGED);
1544                                 break;
1545
1546                         default:
1547                                 printf(" [opcode %d len %d]",
1548                                     cmd->opcode, cmd->len);
1549                         }
1550                 }
1551                 if (cmd->len & F_OR) {
1552                         printf(" or");
1553                         or_block = 1;
1554                 } else if (or_block) {
1555                         printf(" }");
1556                         or_block = 0;
1557                 }
1558         }
1559         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1560                                               | HAVE_IP, 0);
1561         if (comment)
1562                 printf(" // %s", comment);
1563         printf("\n");
1564 }
1565
1566 static void
1567 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1568 {
1569         struct protoent *pe;
1570         struct in_addr a;
1571         uint16_t rulenum;
1572         char buf[INET6_ADDRSTRLEN];
1573
1574         if (!co.do_expired) {
1575                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1576                         return;
1577         }
1578         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1579         printf("%05d", rulenum);
1580         if (pcwidth>0 || bcwidth>0)
1581             printf(" %*llu %*llu (%ds)", pcwidth,
1582                 align_uint64(&d->pcnt), bcwidth,
1583                 align_uint64(&d->bcnt), d->expire);
1584         switch (d->dyn_type) {
1585         case O_LIMIT_PARENT:
1586                 printf(" PARENT %d", d->count);
1587                 break;
1588         case O_LIMIT:
1589                 printf(" LIMIT");
1590                 break;
1591         case O_KEEP_STATE: /* bidir, no mask */
1592                 printf(" STATE");
1593                 break;
1594         }
1595
1596         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1597                 printf(" %s", pe->p_name);
1598         else
1599                 printf(" proto %u", d->id.proto);
1600
1601         if (d->id.addr_type == 4) {
1602                 a.s_addr = htonl(d->id.src_ip);
1603                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1604
1605                 a.s_addr = htonl(d->id.dst_ip);
1606                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1607         } else if (d->id.addr_type == 6) {
1608                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1609                     sizeof(buf)), d->id.src_port);
1610                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1611                     sizeof(buf)), d->id.dst_port);
1612         } else
1613                 printf(" UNKNOWN <-> UNKNOWN\n");
1614
1615         printf("\n");
1616 }
1617
1618 /*
1619  * This one handles all set-related commands
1620  *      ipfw set { show | enable | disable }
1621  *      ipfw set swap X Y
1622  *      ipfw set move X to Y
1623  *      ipfw set move rule X to Y
1624  */
1625 void
1626 ipfw_sets_handler(char *av[])
1627 {
1628         uint32_t set_disable, masks[2];
1629         int i, nbytes;
1630         uint16_t rulenum;
1631         uint8_t cmd, new_set;
1632
1633         av++;
1634
1635         if (av[0] == NULL)
1636                 errx(EX_USAGE, "set needs command");
1637         if (_substrcmp(*av, "show") == 0) {
1638                 void *data = NULL;
1639                 char const *msg;
1640                 int nalloc;
1641
1642                 nalloc = nbytes = sizeof(struct ip_fw);
1643                 while (nbytes >= nalloc) {
1644                         if (data)
1645                                 free(data);
1646                         nalloc = nalloc * 2 + 200;
1647                         nbytes = nalloc;
1648                 data = safe_calloc(1, nbytes);
1649                 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1650                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1651                 }
1652
1653                 bcopy(&((struct ip_fw *)data)->next_rule,
1654                         &set_disable, sizeof(set_disable));
1655
1656                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1657                         if ((set_disable & (1<<i))) {
1658                                 printf("%s %d", msg, i);
1659                                 msg = "";
1660                         }
1661                 msg = (set_disable) ? " enable" : "enable";
1662                 for (i = 0; i < RESVD_SET; i++)
1663                         if (!(set_disable & (1<<i))) {
1664                                 printf("%s %d", msg, i);
1665                                 msg = "";
1666                         }
1667                 printf("\n");
1668         } else if (_substrcmp(*av, "swap") == 0) {
1669                 av++;
1670                 if ( av[0] == NULL || av[1] == NULL )
1671                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1672                 rulenum = atoi(av[0]);
1673                 new_set = atoi(av[1]);
1674                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1675                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1676                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1677                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1678                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1679                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1680         } else if (_substrcmp(*av, "move") == 0) {
1681                 av++;
1682                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1683                         cmd = 2;
1684                         av++;
1685                 } else
1686                         cmd = 3;
1687                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1688                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1689                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1690                 rulenum = atoi(av[0]);
1691                 new_set = atoi(av[2]);
1692                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1693                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1694                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1695                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1696                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1697                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1698                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1699         } else if (_substrcmp(*av, "disable") == 0 ||
1700                    _substrcmp(*av, "enable") == 0 ) {
1701                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1702
1703                 av++;
1704                 masks[0] = masks[1] = 0;
1705
1706                 while (av[0]) {
1707                         if (isdigit(**av)) {
1708                                 i = atoi(*av);
1709                                 if (i < 0 || i > RESVD_SET)
1710                                         errx(EX_DATAERR,
1711                                             "invalid set number %d\n", i);
1712                                 masks[which] |= (1<<i);
1713                         } else if (_substrcmp(*av, "disable") == 0)
1714                                 which = 0;
1715                         else if (_substrcmp(*av, "enable") == 0)
1716                                 which = 1;
1717                         else
1718                                 errx(EX_DATAERR,
1719                                         "invalid set command %s\n", *av);
1720                         av++;
1721                 }
1722                 if ( (masks[0] & masks[1]) != 0 )
1723                         errx(EX_DATAERR,
1724                             "cannot enable and disable the same set\n");
1725
1726                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1727                 if (i)
1728                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1729         } else
1730                 errx(EX_USAGE, "invalid set command %s\n", *av);
1731 }
1732
1733 void
1734 ipfw_sysctl_handler(char *av[], int which)
1735 {
1736         av++;
1737
1738         if (av[0] == NULL) {
1739                 warnx("missing keyword to enable/disable\n");
1740         } else if (_substrcmp(*av, "firewall") == 0) {
1741                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1742                     &which, sizeof(which));
1743         } else if (_substrcmp(*av, "one_pass") == 0) {
1744                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1745                     &which, sizeof(which));
1746         } else if (_substrcmp(*av, "debug") == 0) {
1747                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1748                     &which, sizeof(which));
1749         } else if (_substrcmp(*av, "verbose") == 0) {
1750                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1751                     &which, sizeof(which));
1752         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1753                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1754                     &which, sizeof(which));
1755 #ifndef NO_ALTQ
1756         } else if (_substrcmp(*av, "altq") == 0) {
1757                 altq_set_enabled(which);
1758 #endif
1759         } else {
1760                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1761         }
1762 }
1763
1764 void
1765 ipfw_list(int ac, char *av[], int show_counters)
1766 {
1767         struct ip_fw *r;
1768         ipfw_dyn_rule *dynrules, *d;
1769
1770 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1771         char *lim;
1772         void *data = NULL;
1773         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1774         int exitval = EX_OK;
1775         int lac;
1776         char **lav;
1777         u_long rnum, last;
1778         char *endptr;
1779         int seen = 0;
1780         uint8_t set;
1781
1782         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1783         int nalloc = 1024;      /* start somewhere... */
1784
1785         last = 0;
1786
1787         if (co.test_only) {
1788                 fprintf(stderr, "Testing only, list disabled\n");
1789                 return;
1790         }
1791         if (co.do_pipe) {
1792                 dummynet_list(ac, av, show_counters);
1793                 return;
1794         }
1795
1796         ac--;
1797         av++;
1798
1799         /* get rules or pipes from kernel, resizing array as necessary */
1800         nbytes = nalloc;
1801
1802         while (nbytes >= nalloc) {
1803                 nalloc = nalloc * 2 + 200;
1804                 nbytes = nalloc;
1805                 data = safe_realloc(data, nbytes);
1806                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1807                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1808                                 co.do_pipe ? "DUMMYNET" : "FW");
1809         }
1810
1811         /*
1812          * Count static rules. They have variable size so we
1813          * need to scan the list to count them.
1814          */
1815         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1816                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1817                     ++nstat, r = NEXT(r) )
1818                 ; /* nothing */
1819
1820         /*
1821          * Count dynamic rules. This is easier as they have
1822          * fixed size.
1823          */
1824         r = NEXT(r);
1825         dynrules = (ipfw_dyn_rule *)r ;
1826         n = (char *)r - (char *)data;
1827         ndyn = (nbytes - n) / sizeof *dynrules;
1828
1829         /* if showing stats, figure out column widths ahead of time */
1830         bcwidth = pcwidth = 0;
1831         if (show_counters) {
1832                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1833                         /* skip rules from another set */
1834                         if (co.use_set && r->set != co.use_set - 1)
1835                                 continue;
1836
1837                         /* packet counter */
1838                         width = snprintf(NULL, 0, "%llu",
1839                             align_uint64(&r->pcnt));
1840                         if (width > pcwidth)
1841                                 pcwidth = width;
1842
1843                         /* byte counter */
1844                         width = snprintf(NULL, 0, "%llu",
1845                             align_uint64(&r->bcnt));
1846                         if (width > bcwidth)
1847                                 bcwidth = width;
1848                 }
1849         }
1850         if (co.do_dynamic && ndyn) {
1851                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1852                         if (co.use_set) {
1853                                 /* skip rules from another set */
1854                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1855                                       &set, sizeof(uint8_t));
1856                                 if (set != co.use_set - 1)
1857                                         continue;
1858                         }
1859                         width = snprintf(NULL, 0, "%llu",
1860                             align_uint64(&d->pcnt));
1861                         if (width > pcwidth)
1862                                 pcwidth = width;
1863
1864                         width = snprintf(NULL, 0, "%llu",
1865                             align_uint64(&d->bcnt));
1866                         if (width > bcwidth)
1867                                 bcwidth = width;
1868                 }
1869         }
1870         /* if no rule numbers were specified, list all rules */
1871         if (ac == 0) {
1872                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1873                         if (co.use_set && r->set != co.use_set - 1)
1874                                 continue;
1875                         show_ipfw(r, pcwidth, bcwidth);
1876                 }
1877
1878                 if (co.do_dynamic && ndyn) {
1879                         printf("## Dynamic rules (%d):\n", ndyn);
1880                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1881                                 if (co.use_set) {
1882                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1883                                               &set, sizeof(uint8_t));
1884                                         if (set != co.use_set - 1)
1885                                                 continue;
1886                                 }
1887                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1888                 }
1889                 }
1890                 goto done;
1891         }
1892
1893         /* display specific rules requested on command line */
1894
1895         for (lac = ac, lav = av; lac != 0; lac--) {
1896                 /* convert command line rule # */
1897                 last = rnum = strtoul(*lav++, &endptr, 10);
1898                 if (*endptr == '-')
1899                         last = strtoul(endptr+1, &endptr, 10);
1900                 if (*endptr) {
1901                         exitval = EX_USAGE;
1902                         warnx("invalid rule number: %s", *(lav - 1));
1903                         continue;
1904                 }
1905                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1906                         if (r->rulenum > last)
1907                                 break;
1908                         if (co.use_set && r->set != co.use_set - 1)
1909                                 continue;
1910                         if (r->rulenum >= rnum && r->rulenum <= last) {
1911                                 show_ipfw(r, pcwidth, bcwidth);
1912                                 seen = 1;
1913                         }
1914                 }
1915                 if (!seen) {
1916                         /* give precedence to other error(s) */
1917                         if (exitval == EX_OK)
1918                                 exitval = EX_UNAVAILABLE;
1919                         warnx("rule %lu does not exist", rnum);
1920                 }
1921         }
1922
1923         if (co.do_dynamic && ndyn) {
1924                 printf("## Dynamic rules:\n");
1925                 for (lac = ac, lav = av; lac != 0; lac--) {
1926                         last = rnum = strtoul(*lav++, &endptr, 10);
1927                         if (*endptr == '-')
1928                                 last = strtoul(endptr+1, &endptr, 10);
1929                         if (*endptr)
1930                                 /* already warned */
1931                                 continue;
1932                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1933                                 uint16_t rulenum;
1934
1935                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1936                                 if (rulenum > rnum)
1937                                         break;
1938                                 if (co.use_set) {
1939                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1940                                               &set, sizeof(uint8_t));
1941                                         if (set != co.use_set - 1)
1942                                                 continue;
1943                                 }
1944                                 if (r->rulenum >= rnum && r->rulenum <= last)
1945                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1946                         }
1947                 }
1948         }
1949
1950         ac = 0;
1951
1952 done:
1953         free(data);
1954
1955         if (exitval != EX_OK)
1956                 exit(exitval);
1957 #undef NEXT
1958 }
1959
1960 static int
1961 lookup_host (char *host, struct in_addr *ipaddr)
1962 {
1963         struct hostent *he;
1964
1965         if (!inet_aton(host, ipaddr)) {
1966                 if ((he = gethostbyname(host)) == NULL)
1967                         return(-1);
1968                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1969         }
1970         return(0);
1971 }
1972
1973 /*
1974  * fills the addr and mask fields in the instruction as appropriate from av.
1975  * Update length as appropriate.
1976  * The following formats are allowed:
1977  *      me      returns O_IP_*_ME
1978  *      1.2.3.4         single IP address
1979  *      1.2.3.4:5.6.7.8 address:mask
1980  *      1.2.3.4/24      address/mask
1981  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1982  * We can have multiple comma-separated address/mask entries.
1983  */
1984 static void
1985 fill_ip(ipfw_insn_ip *cmd, char *av)
1986 {
1987         int len = 0;
1988         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
1989
1990         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1991
1992         if (_substrcmp(av, "any") == 0)
1993                 return;
1994
1995         if (_substrcmp(av, "me") == 0) {
1996                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1997                 return;
1998         }
1999
2000         if (strncmp(av, "table(", 6) == 0) {
2001                 char *p = strchr(av + 6, ',');
2002
2003                 if (p)
2004                         *p++ = '\0';
2005                 cmd->o.opcode = O_IP_DST_LOOKUP;
2006                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2007                 if (p) {
2008                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2009                         d[0] = strtoul(p, NULL, 0);
2010                 } else
2011                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2012                 return;
2013         }
2014
2015     while (av) {
2016         /*
2017          * After the address we can have '/' or ':' indicating a mask,
2018          * ',' indicating another address follows, '{' indicating a
2019          * set of addresses of unspecified size.
2020          */
2021         char *t = NULL, *p = strpbrk(av, "/:,{");
2022         int masklen;
2023         char md, nd = '\0';
2024
2025         if (p) {
2026                 md = *p;
2027                 *p++ = '\0';
2028                 if ((t = strpbrk(p, ",{")) != NULL) {
2029                         nd = *t;
2030                         *t = '\0';
2031                 }
2032         } else
2033                 md = '\0';
2034
2035         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2036                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2037         switch (md) {
2038         case ':':
2039                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2040                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2041                 break;
2042         case '/':
2043                 masklen = atoi(p);
2044                 if (masklen == 0)
2045                         d[1] = htonl(0);        /* mask */
2046                 else if (masklen > 32)
2047                         errx(EX_DATAERR, "bad width ``%s''", p);
2048                 else
2049                         d[1] = htonl(~0 << (32 - masklen));
2050                 break;
2051         case '{':       /* no mask, assume /24 and put back the '{' */
2052                 d[1] = htonl(~0 << (32 - 24));
2053                 *(--p) = md;
2054                 break;
2055
2056         case ',':       /* single address plus continuation */
2057                 *(--p) = md;
2058                 /* FALLTHROUGH */
2059         case 0:         /* initialization value */
2060         default:
2061                 d[1] = htonl(~0);       /* force /32 */
2062                 break;
2063         }
2064         d[0] &= d[1];           /* mask base address with mask */
2065         if (t)
2066                 *t = nd;
2067         /* find next separator */
2068         if (p)
2069                 p = strpbrk(p, ",{");
2070         if (p && *p == '{') {
2071                 /*
2072                  * We have a set of addresses. They are stored as follows:
2073                  *   arg1       is the set size (powers of 2, 2..256)
2074                  *   addr       is the base address IN HOST FORMAT
2075                  *   mask..     is an array of arg1 bits (rounded up to
2076                  *              the next multiple of 32) with bits set
2077                  *              for each host in the map.
2078                  */
2079                 uint32_t *map = (uint32_t *)&cmd->mask;
2080                 int low, high;
2081                 int i = contigmask((uint8_t *)&(d[1]), 32);
2082
2083                 if (len > 0)
2084                         errx(EX_DATAERR, "address set cannot be in a list");
2085                 if (i < 24 || i > 31)
2086                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2087                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2088                 d[0] = ntohl(d[0]);             /* base addr in host format */
2089                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2090                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2091                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2092                         map[i] = 0;     /* clear map */
2093
2094                 av = p + 1;
2095                 low = d[0] & 0xff;
2096                 high = low + cmd->o.arg1 - 1;
2097                 /*
2098                  * Here, i stores the previous value when we specify a range
2099                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2100                  * have no previous value.
2101                  */
2102                 i = -1; /* previous value in a range */
2103                 while (isdigit(*av)) {
2104                         char *s;
2105                         int a = strtol(av, &s, 0);
2106
2107                         if (s == av) { /* no parameter */
2108                             if (*av != '}')
2109                                 errx(EX_DATAERR, "set not closed\n");
2110                             if (i != -1)
2111                                 errx(EX_DATAERR, "incomplete range %d-", i);
2112                             break;
2113                         }
2114                         if (a < low || a > high)
2115                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2116                                 a, low, high);
2117                         a -= low;
2118                         if (i == -1)    /* no previous in range */
2119                             i = a;
2120                         else {          /* check that range is valid */
2121                             if (i > a)
2122                                 errx(EX_DATAERR, "invalid range %d-%d",
2123                                         i+low, a+low);
2124                             if (*s == '-')
2125                                 errx(EX_DATAERR, "double '-' in range");
2126                         }
2127                         for (; i <= a; i++)
2128                             map[i/32] |= 1<<(i & 31);
2129                         i = -1;
2130                         if (*s == '-')
2131                             i = a;
2132                         else if (*s == '}')
2133                             break;
2134                         av = s+1;
2135                 }
2136                 return;
2137         }
2138         av = p;
2139         if (av)                 /* then *av must be a ',' */
2140                 av++;
2141
2142         /* Check this entry */
2143         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2144                 /*
2145                  * 'any' turns the entire list into a NOP.
2146                  * 'not any' never matches, so it is removed from the
2147                  * list unless it is the only item, in which case we
2148                  * report an error.
2149                  */
2150                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2151                         if (av == NULL && len == 0) /* only this entry */
2152                                 errx(EX_DATAERR, "not any never matches");
2153                 }
2154                 /* else do nothing and skip this entry */
2155                 return;
2156         }
2157         /* A single IP can be stored in an optimized format */
2158         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2159                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2160                 return;
2161         }
2162         len += 2;       /* two words... */
2163         d += 2;
2164     } /* end while */
2165     if (len + 1 > F_LEN_MASK)
2166         errx(EX_DATAERR, "address list too long");
2167     cmd->o.len |= len+1;
2168 }
2169
2170
2171 /* n2mask sets n bits of the mask */
2172 void
2173 n2mask(struct in6_addr *mask, int n)
2174 {
2175         static int      minimask[9] =
2176             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2177         u_char          *p;
2178
2179         memset(mask, 0, sizeof(struct in6_addr));
2180         p = (u_char *) mask;
2181         for (; n > 0; p++, n -= 8) {
2182                 if (n >= 8)
2183                         *p = 0xff;
2184                 else
2185                         *p = minimask[n];
2186         }
2187         return;
2188 }
2189
2190
2191 /*
2192  * helper function to process a set of flags and set bits in the
2193  * appropriate masks.
2194  */
2195 static void
2196 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2197         struct _s_x *flags, char *p)
2198 {
2199         uint8_t set=0, clear=0;
2200
2201         while (p && *p) {
2202                 char *q;        /* points to the separator */
2203                 int val;
2204                 uint8_t *which; /* mask we are working on */
2205
2206                 if (*p == '!') {
2207                         p++;
2208                         which = &clear;
2209                 } else
2210                         which = &set;
2211                 q = strchr(p, ',');
2212                 if (q)
2213                         *q++ = '\0';
2214                 val = match_token(flags, p);
2215                 if (val <= 0)
2216                         errx(EX_DATAERR, "invalid flag %s", p);
2217                 *which |= (uint8_t)val;
2218                 p = q;
2219         }
2220         cmd->opcode = opcode;
2221         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2222         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2223 }
2224
2225
2226 void
2227 ipfw_delete(char *av[])
2228 {
2229         uint32_t rulenum;
2230         int i;
2231         int exitval = EX_OK;
2232         int do_set = 0;
2233
2234         av++;
2235         NEED1("missing rule specification");
2236         if ( *av && _substrcmp(*av, "set") == 0) {
2237                 /* Do not allow using the following syntax:
2238                  *      ipfw set N delete set M
2239                  */
2240                 if (co.use_set)
2241                         errx(EX_DATAERR, "invalid syntax");
2242                 do_set = 1;     /* delete set */
2243                 av++;
2244         }
2245
2246         /* Rule number */
2247         while (*av && isdigit(**av)) {
2248                 i = atoi(*av); av++;
2249                 if (co.do_nat) {
2250                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2251                         if (exitval) {
2252                                 exitval = EX_UNAVAILABLE;
2253                                 warn("rule %u not available", i);
2254                         }
2255                 } else if (co.do_pipe) {
2256                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2257                 } else {
2258                         if (co.use_set)
2259                                 rulenum = (i & 0xffff) | (5 << 24) |
2260                                     ((co.use_set - 1) << 16);
2261                         else
2262                         rulenum =  (i & 0xffff) | (do_set << 24);
2263                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2264                         if (i) {
2265                                 exitval = EX_UNAVAILABLE;
2266                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2267                                     rulenum);
2268                         }
2269                 }
2270         }
2271         if (exitval != EX_OK)
2272                 exit(exitval);
2273 }
2274
2275
2276 /*
2277  * fill the interface structure. We do not check the name as we can
2278  * create interfaces dynamically, so checking them at insert time
2279  * makes relatively little sense.
2280  * Interface names containing '*', '?', or '[' are assumed to be shell
2281  * patterns which match interfaces.
2282  */
2283 static void
2284 fill_iface(ipfw_insn_if *cmd, char *arg)
2285 {
2286         cmd->name[0] = '\0';
2287         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2288
2289         /* Parse the interface or address */
2290         if (strcmp(arg, "any") == 0)
2291                 cmd->o.len = 0;         /* effectively ignore this command */
2292         else if (!isdigit(*arg)) {
2293                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2294                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2295         } else if (!inet_aton(arg, &cmd->p.ip))
2296                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2297 }
2298
2299 static void
2300 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2301 {
2302         int i;
2303         size_t l;
2304         char *ap, *ptr, *optr;
2305         struct ether_addr *mac;
2306         const char *macset = "0123456789abcdefABCDEF:";
2307
2308         if (strcmp(p, "any") == 0) {
2309                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2310                         addr[i] = mask[i] = 0;
2311                 return;
2312         }
2313
2314         optr = ptr = strdup(p);
2315         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2316                 l = strlen(ap);
2317                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2318                         errx(EX_DATAERR, "Incorrect MAC address");
2319                 bcopy(mac, addr, ETHER_ADDR_LEN);
2320         } else
2321                 errx(EX_DATAERR, "Incorrect MAC address");
2322
2323         if (ptr != NULL) { /* we have mask? */
2324                 if (p[ptr - optr - 1] == '/') { /* mask len */
2325                         long ml = strtol(ptr, &ap, 10);
2326                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2327                                 errx(EX_DATAERR, "Incorrect mask length");
2328                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2329                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2330                 } else { /* mask */
2331                         l = strlen(ptr);
2332                         if (strspn(ptr, macset) != l ||
2333                             (mac = ether_aton(ptr)) == NULL)
2334                                 errx(EX_DATAERR, "Incorrect mask");
2335                         bcopy(mac, mask, ETHER_ADDR_LEN);
2336                 }
2337         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2338                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2339                         mask[i] = 0xff;
2340         }
2341         for (i = 0; i < ETHER_ADDR_LEN; i++)
2342                 addr[i] &= mask[i];
2343
2344         free(optr);
2345 }
2346
2347 /*
2348  * helper function, updates the pointer to cmd with the length
2349  * of the current command, and also cleans up the first word of
2350  * the new command in case it has been clobbered before.
2351  */
2352 static ipfw_insn *
2353 next_cmd(ipfw_insn *cmd)
2354 {
2355         cmd += F_LEN(cmd);
2356         bzero(cmd, sizeof(*cmd));
2357         return cmd;
2358 }
2359
2360 /*
2361  * Takes arguments and copies them into a comment
2362  */
2363 static void
2364 fill_comment(ipfw_insn *cmd, char **av)
2365 {
2366         int i, l;
2367         char *p = (char *)(cmd + 1);
2368
2369         cmd->opcode = O_NOP;
2370         cmd->len =  (cmd->len & (F_NOT | F_OR));
2371
2372         /* Compute length of comment string. */
2373         for (i = 0, l = 0; av[i] != NULL; i++)
2374                 l += strlen(av[i]) + 1;
2375         if (l == 0)
2376                 return;
2377         if (l > 84)
2378                 errx(EX_DATAERR,
2379                     "comment too long (max 80 chars)");
2380         l = 1 + (l+3)/4;
2381         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2382         for (i = 0; av[i] != NULL; i++) {
2383                 strcpy(p, av[i]);
2384                 p += strlen(av[i]);
2385                 *p++ = ' ';
2386         }
2387         *(--p) = '\0';
2388 }
2389
2390 /*
2391  * A function to fill simple commands of size 1.
2392  * Existing flags are preserved.
2393  */
2394 static void
2395 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2396 {
2397         cmd->opcode = opcode;
2398         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2399         cmd->arg1 = arg;
2400 }
2401
2402 /*
2403  * Fetch and add the MAC address and type, with masks. This generates one or
2404  * two microinstructions, and returns the pointer to the last one.
2405  */
2406 static ipfw_insn *
2407 add_mac(ipfw_insn *cmd, char *av[])
2408 {
2409         ipfw_insn_mac *mac;
2410
2411         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2412                 errx(EX_DATAERR, "MAC dst src");
2413
2414         cmd->opcode = O_MACADDR2;
2415         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2416
2417         mac = (ipfw_insn_mac *)cmd;
2418         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2419         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2420             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2421         return cmd;
2422 }
2423
2424 static ipfw_insn *
2425 add_mactype(ipfw_insn *cmd, char *av)
2426 {
2427         if (!av)
2428                 errx(EX_DATAERR, "missing MAC type");
2429         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2430                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2431                 cmd->opcode = O_MAC_TYPE;
2432                 return cmd;
2433         } else
2434                 return NULL;
2435 }
2436
2437 static ipfw_insn *
2438 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2439 {
2440         struct protoent *pe;
2441         char *ep;
2442         int proto;
2443
2444         proto = strtol(av, &ep, 10);
2445         if (*ep != '\0' || proto <= 0) {
2446                 if ((pe = getprotobyname(av)) == NULL)
2447                         return NULL;
2448                 proto = pe->p_proto;
2449         }
2450
2451         fill_cmd(cmd, O_PROTO, 0, proto);
2452         *protop = proto;
2453         return cmd;
2454 }
2455
2456 static ipfw_insn *
2457 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2458 {
2459         u_char proto = IPPROTO_IP;
2460
2461         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2462                 ; /* do not set O_IP4 nor O_IP6 */
2463         else if (strcmp(av, "ip4") == 0)
2464                 /* explicit "just IPv4" rule */
2465                 fill_cmd(cmd, O_IP4, 0, 0);
2466         else if (strcmp(av, "ip6") == 0) {
2467                 /* explicit "just IPv6" rule */
2468                 proto = IPPROTO_IPV6;
2469                 fill_cmd(cmd, O_IP6, 0, 0);
2470         } else
2471                 return add_proto0(cmd, av, protop);
2472
2473         *protop = proto;
2474         return cmd;
2475 }
2476
2477 static ipfw_insn *
2478 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2479 {
2480         u_char proto = IPPROTO_IP;
2481
2482         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2483                 ; /* do not set O_IP4 nor O_IP6 */
2484         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2485                 /* explicit "just IPv4" rule */
2486                 fill_cmd(cmd, O_IP4, 0, 0);
2487         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2488                 /* explicit "just IPv6" rule */
2489                 proto = IPPROTO_IPV6;
2490                 fill_cmd(cmd, O_IP6, 0, 0);
2491         } else
2492                 return add_proto0(cmd, av, protop);
2493
2494         *protop = proto;
2495         return cmd;
2496 }
2497
2498 static ipfw_insn *
2499 add_srcip(ipfw_insn *cmd, char *av)
2500 {
2501         fill_ip((ipfw_insn_ip *)cmd, av);
2502         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2503                 cmd->opcode = O_IP_SRC_SET;
2504         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2505                 cmd->opcode = O_IP_SRC_LOOKUP;
2506         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2507                 cmd->opcode = O_IP_SRC_ME;
2508         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2509                 cmd->opcode = O_IP_SRC;
2510         else                                                    /* addr/mask */
2511                 cmd->opcode = O_IP_SRC_MASK;
2512         return cmd;
2513 }
2514
2515 static ipfw_insn *
2516 add_dstip(ipfw_insn *cmd, char *av)
2517 {
2518         fill_ip((ipfw_insn_ip *)cmd, av);
2519         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2520                 ;
2521         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2522                 ;
2523         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2524                 cmd->opcode = O_IP_DST_ME;
2525         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2526                 cmd->opcode = O_IP_DST;
2527         else                                                    /* addr/mask */
2528                 cmd->opcode = O_IP_DST_MASK;
2529         return cmd;
2530 }
2531
2532 static ipfw_insn *
2533 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2534 {
2535         /* XXX "any" is trapped before. Perhaps "to" */
2536         if (_substrcmp(av, "any") == 0) {
2537                 return NULL;
2538         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2539                 /* XXX todo: check that we have a protocol with ports */
2540                 cmd->opcode = opcode;
2541                 return cmd;
2542         }
2543         return NULL;
2544 }
2545
2546 static ipfw_insn *
2547 add_src(ipfw_insn *cmd, char *av, u_char proto)
2548 {
2549         struct in6_addr a;
2550         char *host, *ch;
2551         ipfw_insn *ret = NULL;
2552
2553         if ((host = strdup(av)) == NULL)
2554                 return NULL;
2555         if ((ch = strrchr(host, '/')) != NULL)
2556                 *ch = '\0';
2557
2558         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2559             inet_pton(AF_INET6, host, &a) == 1)
2560                 ret = add_srcip6(cmd, av);
2561         /* XXX: should check for IPv4, not !IPv6 */
2562         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2563             inet_pton(AF_INET6, host, &a) != 1))
2564                 ret = add_srcip(cmd, av);
2565         if (ret == NULL && strcmp(av, "any") != 0)
2566                 ret = cmd;
2567
2568         free(host);
2569         return ret;
2570 }
2571
2572 static ipfw_insn *
2573 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2574 {
2575         struct in6_addr a;
2576         char *host, *ch;
2577         ipfw_insn *ret = NULL;
2578
2579         if ((host = strdup(av)) == NULL)
2580                 return NULL;
2581         if ((ch = strrchr(host, '/')) != NULL)
2582                 *ch = '\0';
2583
2584         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2585             inet_pton(AF_INET6, host, &a) == 1)
2586                 ret = add_dstip6(cmd, av);
2587         /* XXX: should check for IPv4, not !IPv6 */
2588         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2589             inet_pton(AF_INET6, host, &a) != 1))
2590                 ret = add_dstip(cmd, av);
2591         if (ret == NULL && strcmp(av, "any") != 0)
2592                 ret = cmd;
2593
2594         free(host);
2595         return ret;
2596 }
2597
2598 /*
2599  * Parse arguments and assemble the microinstructions which make up a rule.
2600  * Rules are added into the 'rulebuf' and then copied in the correct order
2601  * into the actual rule.
2602  *
2603  * The syntax for a rule starts with the action, followed by
2604  * optional action parameters, and the various match patterns.
2605  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2606  * (generated if the rule includes a keep-state option), then the
2607  * various match patterns, log/altq actions, and the actual action.
2608  *
2609  */
2610 void
2611 ipfw_add(char *av[])
2612 {
2613         /*
2614          * rules are added into the 'rulebuf' and then copied in
2615          * the correct order into the actual rule.
2616          * Some things that need to go out of order (prob, action etc.)
2617          * go into actbuf[].
2618          */
2619         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2620
2621         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2622         ipfw_insn *first_cmd;   /* first match pattern */
2623
2624         struct ip_fw *rule;
2625
2626         /*
2627          * various flags used to record that we entered some fields.
2628          */
2629         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2630         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2631         size_t len;
2632
2633         int i;
2634
2635         int open_par = 0;       /* open parenthesis ( */
2636
2637         /* proto is here because it is used to fetch ports */
2638         u_char proto = IPPROTO_IP;      /* default protocol */
2639
2640         double match_prob = 1; /* match probability, default is always match */
2641
2642         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2643         bzero(cmdbuf, sizeof(cmdbuf));
2644         bzero(rulebuf, sizeof(rulebuf));
2645
2646         rule = (struct ip_fw *)rulebuf;
2647         cmd = (ipfw_insn *)cmdbuf;
2648         action = (ipfw_insn *)actbuf;
2649
2650         av++;
2651
2652         /* [rule N]     -- Rule number optional */
2653         if (av[0] && isdigit(**av)) {
2654                 rule->rulenum = atoi(*av);
2655                 av++;
2656         }
2657
2658         /* [set N]      -- set number (0..RESVD_SET), optional */
2659         if (av[0] && !av[1] && _substrcmp(*av, "set") == 0) {
2660                 int set = strtoul(av[1], NULL, 10);
2661                 if (set < 0 || set > RESVD_SET)
2662                         errx(EX_DATAERR, "illegal set %s", av[1]);
2663                 rule->set = set;
2664                 av += 2;
2665         }
2666
2667         /* [prob D]     -- match probability, optional */
2668         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2669                 match_prob = strtod(av[1], NULL);
2670
2671                 if (match_prob <= 0 || match_prob > 1)
2672                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2673                 av += 2;
2674         }
2675
2676         /* action       -- mandatory */
2677         NEED1("missing action");
2678         i = match_token(rule_actions, *av);
2679         av++;
2680         action->len = 1;        /* default */
2681         switch(i) {
2682         case TOK_CHECKSTATE:
2683                 have_state = action;
2684                 action->opcode = O_CHECK_STATE;
2685                 break;
2686
2687         case TOK_ACCEPT:
2688                 action->opcode = O_ACCEPT;
2689                 break;
2690
2691         case TOK_DENY:
2692                 action->opcode = O_DENY;
2693                 action->arg1 = 0;
2694                 break;
2695
2696         case TOK_REJECT:
2697                 action->opcode = O_REJECT;
2698                 action->arg1 = ICMP_UNREACH_HOST;
2699                 break;
2700
2701         case TOK_RESET:
2702                 action->opcode = O_REJECT;
2703                 action->arg1 = ICMP_REJECT_RST;
2704                 break;
2705
2706         case TOK_RESET6:
2707                 action->opcode = O_UNREACH6;
2708                 action->arg1 = ICMP6_UNREACH_RST;
2709                 break;
2710
2711         case TOK_UNREACH:
2712                 action->opcode = O_REJECT;
2713                 NEED1("missing reject code");
2714                 fill_reject_code(&action->arg1, *av);
2715                 av++;
2716                 break;
2717
2718         case TOK_UNREACH6:
2719                 action->opcode = O_UNREACH6;
2720                 NEED1("missing unreach code");
2721                 fill_unreach6_code(&action->arg1, *av);
2722                 av++;
2723                 break;
2724
2725         case TOK_COUNT:
2726                 action->opcode = O_COUNT;
2727                 break;
2728
2729         case TOK_NAT:
2730                 action->opcode = O_NAT;
2731                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2732                 goto chkarg;
2733
2734         case TOK_QUEUE:
2735                 action->opcode = O_QUEUE;
2736                 goto chkarg;
2737         case TOK_PIPE:
2738                 action->opcode = O_PIPE;
2739                 goto chkarg;
2740         case TOK_SKIPTO:
2741                 action->opcode = O_SKIPTO;
2742                 goto chkarg;
2743         case TOK_NETGRAPH:
2744                 action->opcode = O_NETGRAPH;
2745                 goto chkarg;
2746         case TOK_NGTEE:
2747                 action->opcode = O_NGTEE;
2748                 goto chkarg;
2749         case TOK_DIVERT:
2750                 action->opcode = O_DIVERT;
2751                 goto chkarg;
2752         case TOK_TEE:
2753                 action->opcode = O_TEE;
2754 chkarg:
2755                 if (!av[0])
2756                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2757                 if (isdigit(**av)) {
2758                         action->arg1 = strtoul(*av, NULL, 10);
2759                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2760                                 errx(EX_DATAERR, "illegal argument for %s",
2761                                     *(av - 1));
2762                 } else if (_substrcmp(*av, "tablearg") == 0) {
2763                         action->arg1 = IP_FW_TABLEARG;
2764                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2765                         struct servent *s;
2766                         setservent(1);
2767                         s = getservbyname(av[0], "divert");
2768                         if (s != NULL)
2769                                 action->arg1 = ntohs(s->s_port);
2770                         else
2771                                 errx(EX_DATAERR, "illegal divert/tee port");
2772                 } else
2773                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2774                 av++;
2775                 break;
2776
2777         case TOK_FORWARD: {
2778                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2779                 char *s, *end;
2780
2781                 NEED1("missing forward address[:port]");
2782
2783                 action->opcode = O_FORWARD_IP;
2784                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2785
2786                 /*
2787                  * In the kernel we assume AF_INET and use only
2788                  * sin_port and sin_addr. Remember to set sin_len as
2789                  * the routing code seems to use it too.
2790                  */
2791                 p->sa.sin_family = AF_INET;
2792                 p->sa.sin_len = sizeof(struct sockaddr_in);
2793                 p->sa.sin_port = 0;
2794                 /*
2795                  * locate the address-port separator (':' or ',')
2796                  */
2797                 s = strchr(*av, ':');
2798                 if (s == NULL)
2799                         s = strchr(*av, ',');
2800                 if (s != NULL) {
2801                         *(s++) = '\0';
2802                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2803                         if (s == end)
2804                                 errx(EX_DATAERR,
2805                                     "illegal forwarding port ``%s''", s);
2806                         p->sa.sin_port = (u_short)i;
2807                 }
2808                 if (_substrcmp(*av, "tablearg") == 0)
2809                         p->sa.sin_addr.s_addr = INADDR_ANY;
2810                 else
2811                         lookup_host(*av, &(p->sa.sin_addr));
2812                 av++;
2813                 break;
2814             }
2815         case TOK_COMMENT:
2816                 /* pretend it is a 'count' rule followed by the comment */
2817                 action->opcode = O_COUNT;
2818                 av--;           /* go back... */
2819                 break;
2820
2821         case TOK_SETFIB:
2822             {
2823                 int numfibs;
2824                 size_t intsize = sizeof(int);
2825
2826                 action->opcode = O_SETFIB;
2827                 NEED1("missing fib number");
2828                 action->arg1 = strtoul(*av, NULL, 10);
2829                 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
2830                         errx(EX_DATAERR, "fibs not suported.\n");
2831                 if (action->arg1 >= numfibs)  /* Temporary */
2832                         errx(EX_DATAERR, "fib too large.\n");
2833                 av++;
2834                 break;
2835             }
2836
2837         case TOK_REASS:
2838                 action->opcode = O_REASS;
2839                 break;
2840
2841         default:
2842                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2843         }
2844         action = next_cmd(action);
2845
2846         /*
2847          * [altq queuename] -- altq tag, optional
2848          * [log [logamount N]]  -- log, optional
2849          *
2850          * If they exist, it go first in the cmdbuf, but then it is
2851          * skipped in the copy section to the end of the buffer.
2852          */
2853         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
2854                 av++;
2855                 switch (i) {
2856                 case TOK_LOG:
2857                     {
2858                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2859                         int l;
2860
2861                         if (have_log)
2862                                 errx(EX_DATAERR,
2863                                     "log cannot be specified more than once");
2864                         have_log = (ipfw_insn *)c;
2865                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2866                         cmd->opcode = O_LOG;
2867                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
2868                                 av++;
2869                                 NEED1("logamount requires argument");
2870                                 l = atoi(*av);
2871                                 if (l < 0)
2872                                         errx(EX_DATAERR,
2873                                             "logamount must be positive");
2874                                 c->max_log = l;
2875                                 av++;
2876                         } else {
2877                                 len = sizeof(c->max_log);
2878                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2879                                     &c->max_log, &len, NULL, 0) == -1)
2880                                         errx(1, "sysctlbyname(\"%s\")",
2881                                             "net.inet.ip.fw.verbose_limit");
2882                         }
2883                     }
2884                         break;
2885
2886 #ifndef NO_ALTQ
2887                 case TOK_ALTQ:
2888                     {
2889                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
2890
2891                         NEED1("missing altq queue name");
2892                         if (have_altq)
2893                                 errx(EX_DATAERR,
2894                                     "altq cannot be specified more than once");
2895                         have_altq = (ipfw_insn *)a;
2896                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
2897                         cmd->opcode = O_ALTQ;
2898                         a->qid = altq_name_to_qid(*av);
2899                         av++;
2900                     }
2901                         break;
2902 #endif
2903
2904                 case TOK_TAG:
2905                 case TOK_UNTAG: {
2906                         uint16_t tag;
2907
2908                         if (have_tag)
2909                                 errx(EX_USAGE, "tag and untag cannot be "
2910                                     "specified more than once");
2911                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
2912                            rule_action_params);
2913                         have_tag = cmd;
2914                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
2915                         av++;
2916                         break;
2917                 }
2918
2919                 default:
2920                         abort();
2921                 }
2922                 cmd = next_cmd(cmd);
2923         }
2924
2925         if (have_state) /* must be a check-state, we are done */
2926                 goto done;
2927
2928 #define OR_START(target)                                        \
2929         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
2930                 if (open_par)                                   \
2931                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2932                 prev = NULL;                                    \
2933                 open_par = 1;                                   \
2934                 if ( (av[0])[1] == '\0') {                      \
2935                         av++;                                   \
2936                 } else                                          \
2937                         (*av)++;                                \
2938         }                                                       \
2939         target:                                                 \
2940
2941
2942 #define CLOSE_PAR                                               \
2943         if (open_par) {                                         \
2944                 if (av[0] && (                                  \
2945                     strcmp(*av, ")") == 0 ||                    \
2946                     strcmp(*av, "}") == 0)) {                   \
2947                         prev = NULL;                            \
2948                         open_par = 0;                           \
2949                         av++;                                   \
2950                 } else                                          \
2951                         errx(EX_USAGE, "missing \")\"\n");      \
2952         }
2953
2954 #define NOT_BLOCK                                               \
2955         if (av[0] && _substrcmp(*av, "not") == 0) {             \
2956                 if (cmd->len & F_NOT)                           \
2957                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2958                 cmd->len |= F_NOT;                              \
2959                 av++;                                           \
2960         }
2961
2962 #define OR_BLOCK(target)                                        \
2963         if (av[0] && _substrcmp(*av, "or") == 0) {              \
2964                 if (prev == NULL || open_par == 0)              \
2965                         errx(EX_DATAERR, "invalid OR block");   \
2966                 prev->len |= F_OR;                              \
2967                 av++;                                   \
2968                 goto target;                                    \
2969         }                                                       \
2970         CLOSE_PAR;
2971
2972         first_cmd = cmd;
2973
2974 #if 0
2975         /*
2976          * MAC addresses, optional.
2977          * If we have this, we skip the part "proto from src to dst"
2978          * and jump straight to the option parsing.
2979          */
2980         NOT_BLOCK;
2981         NEED1("missing protocol");
2982         if (_substrcmp(*av, "MAC") == 0 ||
2983             _substrcmp(*av, "mac") == 0) {
2984                 av++;                   /* the "MAC" keyword */
2985                 add_mac(cmd, av);       /* exits in case of errors */
2986                 cmd = next_cmd(cmd);
2987                 av += 2;                /* dst-mac and src-mac */
2988                 NOT_BLOCK;
2989                 NEED1("missing mac type");
2990                 if (add_mactype(cmd, av[0]))
2991                         cmd = next_cmd(cmd);
2992                 av++;                   /* any or mac-type */
2993                 goto read_options;
2994         }
2995 #endif
2996
2997         /*
2998          * protocol, mandatory
2999          */
3000     OR_START(get_proto);
3001         NOT_BLOCK;
3002         NEED1("missing protocol");
3003         if (add_proto_compat(cmd, *av, &proto)) {
3004                 av++;
3005                 if (F_LEN(cmd) != 0) {
3006                         prev = cmd;
3007                         cmd = next_cmd(cmd);
3008                 }
3009         } else if (first_cmd != cmd) {
3010                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3011         } else
3012                 goto read_options;
3013     OR_BLOCK(get_proto);
3014
3015         /*
3016          * "from", mandatory
3017          */
3018         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3019                 errx(EX_USAGE, "missing ``from''");
3020         av++;
3021
3022         /*
3023          * source IP, mandatory
3024          */
3025     OR_START(source_ip);
3026         NOT_BLOCK;      /* optional "not" */
3027         NEED1("missing source address");
3028         if (add_src(cmd, *av, proto)) {
3029                 av++;
3030                 if (F_LEN(cmd) != 0) {  /* ! any */
3031                         prev = cmd;
3032                         cmd = next_cmd(cmd);
3033                 }
3034         } else
3035                 errx(EX_USAGE, "bad source address %s", *av);
3036     OR_BLOCK(source_ip);
3037
3038         /*
3039          * source ports, optional
3040          */
3041         NOT_BLOCK;      /* optional "not" */
3042         if ( av[0] != NULL ) {
3043                 if (_substrcmp(*av, "any") == 0 ||
3044                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3045                         av++;
3046                         if (F_LEN(cmd) != 0)
3047                                 cmd = next_cmd(cmd);
3048                 }
3049         }
3050
3051         /*
3052          * "to", mandatory
3053          */
3054         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3055                 errx(EX_USAGE, "missing ``to''");
3056         av++;
3057
3058         /*
3059          * destination, mandatory
3060          */
3061     OR_START(dest_ip);
3062         NOT_BLOCK;      /* optional "not" */
3063         NEED1("missing dst address");
3064         if (add_dst(cmd, *av, proto)) {
3065                 av++;
3066                 if (F_LEN(cmd) != 0) {  /* ! any */
3067                         prev = cmd;
3068                         cmd = next_cmd(cmd);
3069                 }
3070         } else
3071                 errx( EX_USAGE, "bad destination address %s", *av);
3072     OR_BLOCK(dest_ip);
3073
3074         /*
3075          * dest. ports, optional
3076          */
3077         NOT_BLOCK;      /* optional "not" */
3078         if (av[0]) {
3079                 if (_substrcmp(*av, "any") == 0 ||
3080                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3081                         av++;
3082                         if (F_LEN(cmd) != 0)
3083                                 cmd = next_cmd(cmd);
3084                 }
3085         }
3086
3087 read_options:
3088         if (av[0] && first_cmd == cmd) {
3089                 /*
3090                  * nothing specified so far, store in the rule to ease
3091                  * printout later.
3092                  */
3093                  rule->_pad = 1;
3094         }
3095         prev = NULL;
3096         while ( av[0] != NULL ) {
3097                 char *s;
3098                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3099
3100                 s = *av;
3101                 cmd32 = (ipfw_insn_u32 *)cmd;
3102
3103                 if (*s == '!') {        /* alternate syntax for NOT */
3104                         if (cmd->len & F_NOT)
3105                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3106                         cmd->len = F_NOT;
3107                         s++;
3108                 }
3109                 i = match_token(rule_options, s);
3110                 av++;
3111                 switch(i) {
3112                 case TOK_NOT:
3113                         if (cmd->len & F_NOT)
3114                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3115                         cmd->len = F_NOT;
3116                         break;
3117
3118                 case TOK_OR:
3119                         if (open_par == 0 || prev == NULL)
3120                                 errx(EX_USAGE, "invalid \"or\" block\n");
3121                         prev->len |= F_OR;
3122                         break;
3123
3124                 case TOK_STARTBRACE:
3125                         if (open_par)
3126                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3127                         open_par = 1;
3128                         break;
3129
3130                 case TOK_ENDBRACE:
3131                         if (!open_par)
3132                                 errx(EX_USAGE, "+missing \")\"\n");
3133                         open_par = 0;
3134                         prev = NULL;
3135                         break;
3136
3137                 case TOK_IN:
3138                         fill_cmd(cmd, O_IN, 0, 0);
3139                         break;
3140
3141                 case TOK_OUT:
3142                         cmd->len ^= F_NOT; /* toggle F_NOT */
3143                         fill_cmd(cmd, O_IN, 0, 0);
3144                         break;
3145
3146                 case TOK_DIVERTED:
3147                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3148                         break;
3149
3150                 case TOK_DIVERTEDLOOPBACK:
3151                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3152                         break;
3153
3154                 case TOK_DIVERTEDOUTPUT:
3155                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3156                         break;
3157
3158                 case TOK_FRAG:
3159                         fill_cmd(cmd, O_FRAG, 0, 0);
3160                         break;
3161
3162                 case TOK_LAYER2:
3163                         fill_cmd(cmd, O_LAYER2, 0, 0);
3164                         break;
3165
3166                 case TOK_XMIT:
3167                 case TOK_RECV:
3168                 case TOK_VIA:
3169                         NEED1("recv, xmit, via require interface name"
3170                                 " or address");
3171                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3172                         av++;
3173                         if (F_LEN(cmd) == 0)    /* not a valid address */
3174                                 break;
3175                         if (i == TOK_XMIT)
3176                                 cmd->opcode = O_XMIT;
3177                         else if (i == TOK_RECV)
3178                                 cmd->opcode = O_RECV;
3179                         else if (i == TOK_VIA)
3180                                 cmd->opcode = O_VIA;
3181                         break;
3182
3183                 case TOK_ICMPTYPES:
3184                         NEED1("icmptypes requires list of types");
3185                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3186                         av++;
3187                         break;
3188
3189                 case TOK_ICMP6TYPES:
3190                         NEED1("icmptypes requires list of types");
3191                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3192                         av++;
3193                         break;
3194
3195                 case TOK_IPTTL:
3196                         NEED1("ipttl requires TTL");
3197                         if (strpbrk(*av, "-,")) {
3198                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3199                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3200                         } else
3201                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3202                         av++;
3203                         break;
3204
3205                 case TOK_IPID:
3206                         NEED1("ipid requires id");
3207                         if (strpbrk(*av, "-,")) {
3208                             if (!add_ports(cmd, *av, 0, O_IPID))
3209                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3210                         } else
3211                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3212                         av++;
3213                         break;
3214
3215                 case TOK_IPLEN:
3216                         NEED1("iplen requires length");
3217                         if (strpbrk(*av, "-,")) {
3218                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3219                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3220                         } else
3221                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3222                         av++;
3223                         break;
3224
3225                 case TOK_IPVER:
3226                         NEED1("ipver requires version");
3227                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3228                         av++;
3229                         break;
3230
3231                 case TOK_IPPRECEDENCE:
3232                         NEED1("ipprecedence requires value");
3233                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3234                             (strtoul(*av, NULL, 0) & 7) << 5);
3235                         av++;
3236                         break;
3237
3238                 case TOK_IPOPTS:
3239                         NEED1("missing argument for ipoptions");
3240                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3241                         av++;
3242                         break;
3243
3244                 case TOK_IPTOS:
3245                         NEED1("missing argument for iptos");
3246                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3247                         av++;
3248                         break;
3249
3250                 case TOK_UID:
3251                         NEED1("uid requires argument");
3252                     {
3253                         char *end;
3254                         uid_t uid;
3255                         struct passwd *pwd;
3256
3257                         cmd->opcode = O_UID;
3258                         uid = strtoul(*av, &end, 0);
3259                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3260                         if (pwd == NULL)
3261                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3262                         cmd32->d[0] = pwd->pw_uid;
3263                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3264                         av++;
3265                     }
3266                         break;
3267
3268                 case TOK_GID:
3269                         NEED1("gid requires argument");
3270                     {
3271                         char *end;
3272                         gid_t gid;
3273                         struct group *grp;
3274
3275                         cmd->opcode = O_GID;
3276                         gid = strtoul(*av, &end, 0);
3277                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3278                         if (grp == NULL)
3279                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3280                         cmd32->d[0] = grp->gr_gid;
3281                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3282                         av++;
3283                     }
3284                         break;
3285
3286                 case TOK_JAIL:
3287                         NEED1("jail requires argument");
3288                     {
3289                         char *end;
3290                         int jid;
3291
3292                         cmd->opcode = O_JAIL;
3293                         jid = (int)strtol(*av, &end, 0);
3294                         if (jid < 0 || *end != '\0')
3295                                 errx(EX_DATAERR, "jail requires prison ID");
3296                         cmd32->d[0] = (uint32_t)jid;
3297                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3298                         av++;
3299                     }
3300                         break;
3301
3302                 case TOK_ESTAB:
3303                         fill_cmd(cmd, O_ESTAB, 0, 0);
3304                         break;
3305
3306                 case TOK_SETUP:
3307                         fill_cmd(cmd, O_TCPFLAGS, 0,
3308                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3309                         break;
3310
3311                 case TOK_TCPDATALEN:
3312                         NEED1("tcpdatalen requires length");
3313                         if (strpbrk(*av, "-,")) {
3314                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3315                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3316                         } else
3317                             fill_cmd(cmd, O_TCPDATALEN, 0,
3318                                     strtoul(*av, NULL, 0));
3319                         av++;
3320                         break;
3321
3322                 case TOK_TCPOPTS:
3323                         NEED1("missing argument for tcpoptions");
3324                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3325                         av++;
3326                         break;
3327
3328                 case TOK_TCPSEQ:
3329                 case TOK_TCPACK:
3330                         NEED1("tcpseq/tcpack requires argument");
3331                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3332                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3333                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3334                         av++;
3335                         break;
3336
3337                 case TOK_TCPWIN:
3338                         NEED1("tcpwin requires length");
3339                         fill_cmd(cmd, O_TCPWIN, 0,
3340                             htons(strtoul(*av, NULL, 0)));
3341                         av++;
3342                         break;
3343
3344                 case TOK_TCPFLAGS:
3345                         NEED1("missing argument for tcpflags");
3346                         cmd->opcode = O_TCPFLAGS;
3347                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3348                         av++;
3349                         break;
3350
3351                 case TOK_KEEPSTATE:
3352                         if (open_par)
3353                                 errx(EX_USAGE, "keep-state cannot be part "
3354                                     "of an or block");
3355                         if (have_state)
3356                                 errx(EX_USAGE, "only one of keep-state "
3357                                         "and limit is allowed");
3358                         have_state = cmd;
3359                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3360                         break;
3361
3362                 case TOK_LIMIT: {
3363                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3364                         int val;
3365
3366                         if (open_par)
3367                                 errx(EX_USAGE,
3368                                     "limit cannot be part of an or block");
3369                         if (have_state)
3370                                 errx(EX_USAGE, "only one of keep-state and "
3371                                     "limit is allowed");
3372                         have_state = cmd;
3373
3374                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3375                         cmd->opcode = O_LIMIT;
3376                         c->limit_mask = c->conn_limit = 0;
3377
3378                         while ( av[0] != NULL ) {
3379                                 if ((val = match_token(limit_masks, *av)) <= 0)
3380                                         break;
3381                                 c->limit_mask |= val;
3382                                 av++;
3383                         }
3384
3385                         if (c->limit_mask == 0)
3386                                 errx(EX_USAGE, "limit: missing limit mask");
3387
3388                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3389                             TOK_LIMIT, rule_options);
3390
3391                         av++;
3392                         break;
3393                 }
3394
3395                 case TOK_PROTO:
3396                         NEED1("missing protocol");
3397                         if (add_proto(cmd, *av, &proto)) {
3398                                 av++;
3399                         } else
3400                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3401                                     *av);
3402                         break;
3403
3404                 case TOK_SRCIP:
3405                         NEED1("missing source IP");
3406                         if (add_srcip(cmd, *av)) {
3407                                 av++;
3408                         }
3409                         break;
3410
3411                 case TOK_DSTIP:
3412                         NEED1("missing destination IP");
3413                         if (add_dstip(cmd, *av)) {
3414                                 av++;
3415                         }
3416                         break;
3417
3418                 case TOK_SRCIP6:
3419                         NEED1("missing source IP6");
3420                         if (add_srcip6(cmd, *av)) {
3421                                 av++;
3422                         }
3423                         break;
3424
3425                 case TOK_DSTIP6:
3426                         NEED1("missing destination IP6");
3427                         if (add_dstip6(cmd, *av)) {
3428                                 av++;
3429                         }
3430                         break;
3431
3432                 case TOK_SRCPORT:
3433                         NEED1("missing source port");
3434                         if (_substrcmp(*av, "any") == 0 ||
3435                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3436                                 av++;
3437                         } else
3438                                 errx(EX_DATAERR, "invalid source port %s", *av);
3439                         break;
3440
3441                 case TOK_DSTPORT:
3442                         NEED1("missing destination port");
3443                         if (_substrcmp(*av, "any") == 0 ||
3444                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3445                                 av++;
3446                         } else
3447                                 errx(EX_DATAERR, "invalid destination port %s",
3448                                     *av);
3449                         break;
3450
3451                 case TOK_MAC:
3452                         if (add_mac(cmd, av))
3453                                 av += 2;
3454                         break;
3455
3456                 case TOK_MACTYPE:
3457                         NEED1("missing mac type");
3458                         if (!add_mactype(cmd, *av))
3459                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3460                         av++;
3461                         break;
3462
3463                 case TOK_VERREVPATH:
3464                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3465                         break;
3466
3467                 case TOK_VERSRCREACH:
3468                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3469                         break;
3470
3471                 case TOK_ANTISPOOF:
3472                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3473                         break;
3474
3475                 case TOK_IPSEC:
3476                         fill_cmd(cmd, O_IPSEC, 0, 0);
3477                         break;
3478
3479                 case TOK_IPV6:
3480                         fill_cmd(cmd, O_IP6, 0, 0);
3481                         break;
3482
3483                 case TOK_IPV4:
3484                         fill_cmd(cmd, O_IP4, 0, 0);
3485                         break;
3486
3487                 case TOK_EXT6HDR:
3488                         fill_ext6hdr( cmd, *av );
3489                         av++;
3490                         break;
3491
3492                 case TOK_FLOWID:
3493                         if (proto != IPPROTO_IPV6 )
3494                                 errx( EX_USAGE, "flow-id filter is active "
3495                                     "only for ipv6 protocol\n");
3496                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3497                         av++;
3498                         break;
3499
3500                 case TOK_COMMENT:
3501                         fill_comment(cmd, av);
3502                         av[0]=NULL;
3503                         break;
3504
3505                 case TOK_TAGGED:
3506                         if (av[0] && strpbrk(*av, "-,")) {
3507                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3508                                         errx(EX_DATAERR, "tagged: invalid tag"
3509                                             " list: %s", *av);
3510                         }
3511                         else {
3512                                 uint16_t tag;
3513
3514                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3515                                     TOK_TAGGED, rule_options);
3516                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3517                         }
3518                         av++;
3519                         break;
3520
3521                 case TOK_FIB:
3522                         NEED1("fib requires fib number");
3523                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3524                         av++;
3525                         break;
3526
3527                 case TOK_LOOKUP: {
3528                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3529                         char *p;
3530                         int j;
3531
3532                         if (!av[0] || !av[1])
3533                                 errx(EX_USAGE, "format: lookup argument tablenum");
3534                         cmd->opcode = O_IP_DST_LOOKUP;
3535                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3536                         i = match_token(rule_options, *av);
3537                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3538                                 if (i == lookup_key[j])
3539                                         break;
3540                         }
3541                         if (lookup_key[j] <= 0)
3542                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3543                         c->d[1] = j; // i converted to option
3544                         av++;
3545                         cmd->arg1 = strtoul(*av, &p, 0);
3546                         if (p && *p)
3547                                 errx(EX_USAGE, "format: lookup argument tablenum");
3548                         av++;
3549                     }
3550                         break;
3551
3552                 default:
3553                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3554                 }
3555                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3556                         prev = cmd;
3557                         cmd = next_cmd(cmd);
3558                 }
3559         }
3560
3561 done:
3562         /*
3563          * Now copy stuff into the rule.
3564          * If we have a keep-state option, the first instruction
3565          * must be a PROBE_STATE (which is generated here).
3566          * If we have a LOG option, it was stored as the first command,
3567          * and now must be moved to the top of the action part.
3568          */
3569         dst = (ipfw_insn *)rule->cmd;
3570
3571         /*
3572          * First thing to write into the command stream is the match probability.
3573          */
3574         if (match_prob != 1) { /* 1 means always match */
3575                 dst->opcode = O_PROB;
3576                 dst->len = 2;
3577                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3578                 dst += dst->len;
3579         }
3580
3581         /*
3582          * generate O_PROBE_STATE if necessary
3583          */
3584         if (have_state && have_state->opcode != O_CHECK_STATE) {
3585                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3586                 dst = next_cmd(dst);
3587         }
3588
3589         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3590         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3591                 i = F_LEN(src);
3592
3593                 switch (src->opcode) {
3594                 case O_LOG:
3595                 case O_KEEP_STATE:
3596                 case O_LIMIT:
3597                 case O_ALTQ:
3598                 case O_TAG:
3599                         break;
3600                 default:
3601                         bcopy(src, dst, i * sizeof(uint32_t));
3602                         dst += i;
3603                 }
3604         }
3605
3606         /*
3607          * put back the have_state command as last opcode
3608          */
3609         if (have_state && have_state->opcode != O_CHECK_STATE) {
3610                 i = F_LEN(have_state);
3611                 bcopy(have_state, dst, i * sizeof(uint32_t));
3612                 dst += i;
3613         }
3614         /*
3615          * start action section
3616          */
3617         rule->act_ofs = dst - rule->cmd;
3618
3619         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3620         if (have_log) {
3621                 i = F_LEN(have_log);
3622                 bcopy(have_log, dst, i * sizeof(uint32_t));
3623                 dst += i;
3624         }
3625         if (have_altq) {
3626                 i = F_LEN(have_altq);
3627                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3628                 dst += i;
3629         }
3630         if (have_tag) {
3631                 i = F_LEN(have_tag);
3632                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3633                 dst += i;
3634         }
3635         /*
3636          * copy all other actions
3637          */
3638         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3639                 i = F_LEN(src);
3640                 bcopy(src, dst, i * sizeof(uint32_t));
3641                 dst += i;
3642         }
3643
3644         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3645         i = (char *)dst - (char *)rule;
3646         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3647                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3648         if (!co.do_quiet)
3649                 show_ipfw(rule, 0, 0);
3650 }
3651
3652 /*
3653  * clear the counters or the log counters.
3654  */
3655 void
3656 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3657 {
3658         uint32_t arg, saved_arg;
3659         int failed = EX_OK;
3660         char const *errstr;
3661         char const *name = optname ? "RESETLOG" : "ZERO";
3662
3663         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3664
3665         av++; ac--;
3666
3667         if (!ac) {
3668                 /* clear all entries */
3669                 if (do_cmd(optname, NULL, 0) < 0)
3670                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3671                 if (!co.do_quiet)
3672                         printf("%s.\n", optname == IP_FW_ZERO ?
3673                             "Accounting cleared":"Logging counts reset");
3674
3675                 return;
3676         }
3677
3678         while (ac) {
3679                 /* Rule number */
3680                 if (isdigit(**av)) {
3681                         arg = strtonum(*av, 0, 0xffff, &errstr);
3682                         if (errstr)
3683                                 errx(EX_DATAERR,
3684                                     "invalid rule number %s\n", *av);
3685                         saved_arg = arg;
3686                         if (co.use_set)
3687                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3688                         av++;
3689                         ac--;
3690                         if (do_cmd(optname, &arg, sizeof(arg))) {
3691                                 warn("rule %u: setsockopt(IP_FW_%s)",
3692                                     saved_arg, name);
3693                                 failed = EX_UNAVAILABLE;
3694                         } else if (!co.do_quiet)
3695                                 printf("Entry %d %s.\n", saved_arg,
3696                                     optname == IP_FW_ZERO ?
3697                                         "cleared" : "logging count reset");
3698                 } else {
3699                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3700                 }
3701         }
3702         if (failed != EX_OK)
3703                 exit(failed);
3704 }
3705
3706 void
3707 ipfw_flush(int force)
3708 {
3709         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3710
3711         if (!force && !co.do_quiet) { /* need to ask user */
3712                 int c;
3713
3714                 printf("Are you sure? [yn] ");
3715                 fflush(stdout);
3716                 do {
3717                         c = toupper(getc(stdin));
3718                         while (c != '\n' && getc(stdin) != '\n')
3719                                 if (feof(stdin))
3720                                         return; /* and do not flush */
3721                 } while (c != 'Y' && c != 'N');
3722                 printf("\n");
3723                 if (c == 'N')   /* user said no */
3724                         return;
3725         }
3726         if (co.do_pipe) {
3727                 dummynet_flush();
3728                 return;
3729         }
3730         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3731         if (co.use_set) {
3732                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3733                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3734                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3735         } else if (do_cmd(cmd, NULL, 0) < 0)
3736                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3737                     co.do_pipe ? "DUMMYNET" : "FW");
3738         if (!co.do_quiet)
3739                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3740 }
3741
3742
3743 static void table_list(ipfw_table_entry ent, int need_header);
3744
3745 /*
3746  * This one handles all table-related commands
3747  *      ipfw table N add addr[/masklen] [value]
3748  *      ipfw table N delete addr[/masklen]
3749  *      ipfw table {N | all} flush
3750  *      ipfw table {N | all} list
3751  */
3752 void
3753 ipfw_table_handler(int ac, char *av[])
3754 {
3755         ipfw_table_entry ent;
3756         int do_add;
3757         int is_all;
3758         size_t len;
3759         char *p;
3760         uint32_t a;
3761         uint32_t tables_max;
3762
3763         len = sizeof(tables_max);
3764         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3765                 NULL, 0) == -1) {
3766 #ifdef IPFW_TABLES_MAX
3767                 warn("Warn: Failed to get the max tables number via sysctl. "
3768                      "Using the compiled in defaults. \nThe reason was");
3769                 tables_max = IPFW_TABLES_MAX;
3770 #else
3771                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3772 #endif
3773         }
3774
3775         ac--; av++;
3776         if (ac && isdigit(**av)) {
3777                 ent.tbl = atoi(*av);
3778                 is_all = 0;
3779                 ac--; av++;
3780         } else if (ac && _substrcmp(*av, "all") == 0) {
3781                 ent.tbl = 0;
3782                 is_all = 1;
3783                 ac--; av++;
3784         } else
3785                 errx(EX_USAGE, "table number or 'all' keyword required");
3786         if (ent.tbl >= tables_max)
3787                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3788                         "value (%d)", tables_max - 1);
3789         NEED1("table needs command");
3790         if (is_all && _substrcmp(*av, "list") != 0
3791                    && _substrcmp(*av, "flush") != 0)
3792                 errx(EX_USAGE, "table number required");
3793
3794         if (_substrcmp(*av, "add") == 0 ||
3795             _substrcmp(*av, "delete") == 0) {
3796                 do_add = **av == 'a';
3797                 ac--; av++;
3798                 if (!ac)
3799                         errx(EX_USAGE, "IP address required");
3800                 p = strchr(*av, '/');
3801                 if (p) {
3802                         *p++ = '\0';
3803                         ent.masklen = atoi(p);
3804                         if (ent.masklen > 32)
3805                                 errx(EX_DATAERR, "bad width ``%s''", p);
3806                 } else
3807                         ent.masklen = 32;
3808                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3809                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3810                 ac--; av++;
3811                 if (do_add && ac) {
3812                         unsigned int tval;
3813                         /* isdigit is a bit of a hack here.. */
3814                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3815                                 ent.value = strtoul(*av, NULL, 0);
3816                         } else {
3817                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3818                                         /* The value must be stored in host order        *
3819                                          * so that the values < 65k can be distinguished */
3820                                         ent.value = ntohl(tval);
3821                                 } else {
3822                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3823                                 }
3824                         }
3825                 } else
3826                         ent.value = 0;
3827                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3828                     &ent, sizeof(ent)) < 0) {
3829                         /* If running silent, don't bomb out on these errors. */
3830                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3831                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3832                                     do_add ? "ADD" : "DEL");
3833                         /* In silent mode, react to a failed add by deleting */
3834                         if (do_add) {
3835                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3836                                 if (do_cmd(IP_FW_TABLE_ADD,
3837                                     &ent, sizeof(ent)) < 0)
3838                                         err(EX_OSERR,
3839                                             "setsockopt(IP_FW_TABLE_ADD)");
3840                         }
3841                 }
3842         } else if (_substrcmp(*av, "flush") == 0) {
3843                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3844                 do {
3845                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3846                             sizeof(ent.tbl)) < 0)
3847                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3848                 } while (++ent.tbl < a);
3849         } else if (_substrcmp(*av, "list") == 0) {
3850                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3851                 do {
3852                         table_list(ent, is_all);
3853                 } while (++ent.tbl < a);
3854         } else
3855                 errx(EX_USAGE, "invalid table command %s", *av);
3856 }
3857
3858 static void
3859 table_list(ipfw_table_entry ent, int need_header)
3860 {
3861         ipfw_table *tbl;
3862         socklen_t l;
3863         uint32_t a;
3864
3865         a = ent.tbl;
3866         l = sizeof(a);
3867         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3868                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3869
3870         /* If a is zero we have nothing to do, the table is empty. */
3871         if (a == 0)
3872                 return;
3873
3874         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3875         tbl = safe_calloc(1, l);
3876         tbl->tbl = ent.tbl;
3877         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3878                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3879         if (tbl->cnt && need_header)
3880                 printf("---table(%d)---\n", tbl->tbl);
3881         for (a = 0; a < tbl->cnt; a++) {
3882                 unsigned int tval;
3883                 tval = tbl->ent[a].value;
3884                 if (co.do_value_as_ip) {
3885                         char tbuf[128];
3886                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
3887                                 &tbl->ent[a].addr), 127);
3888                         /* inet_ntoa expects network order */
3889                         tval = htonl(tval);
3890                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
3891                                 inet_ntoa(*(struct in_addr *)&tval));
3892                 } else {
3893                         printf("%s/%u %u\n",
3894                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
3895                                 tbl->ent[a].masklen, tval);
3896                 }
3897         }
3898         free(tbl);
3899 }