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: head/sbin/ipfw/ipfw2.c 206843 2010-04-19 15:11:45Z luigi $
  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 /*
  44  * FreeBSD uses __unused as a shorthand for __attribute__ ((__unused__))
  45  * whereas Linux sometimes uses __unused as a variable name.
  46  * undefine the macro around problematic places.
  47  */
  48 #undef __unused
  49 #include <fcntl.h>
  50 #define __unused       __attribute__ ((__unused__))
  51
  52 #include <net/ethernet.h>
  53 #include <net/if.h>             /* only IFNAMSIZ */
  54 #include <netinet/in.h>
  55 #include <netinet/in_systm.h>   /* only n_short, n_long */
  56 #include <netinet/ip.h>
  57 #include <netinet/ip_icmp.h>
  58 #include <netinet/ip_fw.h>
  59 #include <netinet/tcp.h>
  60 #include <arpa/inet.h>
  61
  62 struct cmdline_opts co; /* global options */
  63
  64 int resvd_set_number = RESVD_SET;
  65
  66 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  67         if (!av[0])                                                     \
  68                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  69         if (_substrcmp(*av, "tablearg") == 0) {                         \
  70                 arg = IP_FW_TABLEARG;                                   \
  71                 break;                                                  \
  72         }                                                               \
  73                                                                         \
  74         {                                                               \
  75         long _xval;                                                     \
  76         char *end;                                                      \
  77                                                                         \
  78         _xval = strtol(*av, &end, 10);                                  \
  79                                                                         \
  80         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  81                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  82                     match_value(s_x, tok), *av);                        \
  83                                                                         \
  84         if (errno == ERANGE || _xval < min || _xval > max)              \
  85                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
  86                     match_value(s_x, tok), min, max, *av);              \
  87                                                                         \
  88         if (_xval == IP_FW_TABLEARG)                                    \
  89                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
  90                     match_value(s_x, tok), *av);                        \
  91         arg = _xval;                                                    \
  92         }                                                               \
  93 } while (0)
  94
  95 static void
  96 PRINT_UINT_ARG(const char *str, uint32_t arg)
  97 {
  98         if (str != NULL)
  99                 printf("%s",str);
 100         if (arg == IP_FW_TABLEARG)
 101                 printf("tablearg");
 102         else
 103                 printf("%u", arg);
 104 }
 105
 106 static struct _s_x f_tcpflags[] = {
 107         { "syn", TH_SYN },
 108         { "fin", TH_FIN },
 109         { "ack", TH_ACK },
 110         { "psh", TH_PUSH },
 111         { "rst", TH_RST },
 112         { "urg", TH_URG },
 113         { "tcp flag", 0 },
 114         { NULL, 0 }
 115 };
 116
 117 static struct _s_x f_tcpopts[] = {
 118         { "mss",        IP_FW_TCPOPT_MSS },
 119         { "maxseg",     IP_FW_TCPOPT_MSS },
 120         { "window",     IP_FW_TCPOPT_WINDOW },
 121         { "sack",       IP_FW_TCPOPT_SACK },
 122         { "ts",         IP_FW_TCPOPT_TS },
 123         { "timestamp",  IP_FW_TCPOPT_TS },
 124         { "cc",         IP_FW_TCPOPT_CC },
 125         { "tcp option", 0 },
 126         { NULL, 0 }
 127 };
 128
 129 /*
 130  * IP options span the range 0 to 255 so we need to remap them
 131  * (though in fact only the low 5 bits are significant).
 132  */
 133 static struct _s_x f_ipopts[] = {
 134         { "ssrr",       IP_FW_IPOPT_SSRR},
 135         { "lsrr",       IP_FW_IPOPT_LSRR},
 136         { "rr",         IP_FW_IPOPT_RR},
 137         { "ts",         IP_FW_IPOPT_TS},
 138         { "ip option",  0 },
 139         { NULL, 0 }
 140 };
 141
 142 static struct _s_x f_iptos[] = {
 143         { "lowdelay",   IPTOS_LOWDELAY},
 144         { "throughput", IPTOS_THROUGHPUT},
 145         { "reliability", IPTOS_RELIABILITY},
 146         { "mincost",    IPTOS_MINCOST},
 147         { "congestion", IPTOS_ECN_CE},
 148         { "ecntransport", IPTOS_ECN_ECT0},
 149         { "ip tos option", 0},
 150         { NULL, 0 }
 151 };
 152
 153 static struct _s_x limit_masks[] = {
 154         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 155         {"src-addr",    DYN_SRC_ADDR},
 156         {"src-port",    DYN_SRC_PORT},
 157         {"dst-addr",    DYN_DST_ADDR},
 158         {"dst-port",    DYN_DST_PORT},
 159         {NULL,          0}
 160 };
 161
 162 /*
 163  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 164  * This is only used in this code.
 165  */
 166 #define IPPROTO_ETHERTYPE       0x1000
 167 static struct _s_x ether_types[] = {
 168     /*
 169      * Note, we cannot use "-:&/" in the names because they are field
 170      * separators in the type specifications. Also, we use s = NULL as
 171      * end-delimiter, because a type of 0 can be legal.
 172      */
 173         { "ip",         0x0800 },
 174         { "ipv4",       0x0800 },
 175         { "ipv6",       0x86dd },
 176         { "arp",        0x0806 },
 177         { "rarp",       0x8035 },
 178         { "vlan",       0x8100 },
 179         { "loop",       0x9000 },
 180         { "trail",      0x1000 },
 181         { "at",         0x809b },
 182         { "atalk",      0x809b },
 183         { "aarp",       0x80f3 },
 184         { "pppoe_disc", 0x8863 },
 185         { "pppoe_sess", 0x8864 },
 186         { "ipx_8022",   0x00E0 },
 187         { "ipx_8023",   0x0000 },
 188         { "ipx_ii",     0x8137 },
 189         { "ipx_snap",   0x8137 },
 190         { "ipx",        0x8137 },
 191         { "ns",         0x0600 },
 192         { NULL,         0 }
 193 };
 194
 195
 196 static struct _s_x rule_actions[] = {
 197         { "accept",             TOK_ACCEPT },
 198         { "pass",               TOK_ACCEPT },
 199         { "allow",              TOK_ACCEPT },
 200         { "permit",             TOK_ACCEPT },
 201         { "count",              TOK_COUNT },
 202         { "pipe",               TOK_PIPE },
 203         { "queue",              TOK_QUEUE },
 204         { "divert",             TOK_DIVERT },
 205         { "tee",                TOK_TEE },
 206         { "netgraph",           TOK_NETGRAPH },
 207         { "ngtee",              TOK_NGTEE },
 208         { "fwd",                TOK_FORWARD },
 209         { "forward",            TOK_FORWARD },
 210         { "skipto",             TOK_SKIPTO },
 211         { "deny",               TOK_DENY },
 212         { "drop",               TOK_DENY },
 213         { "reject",             TOK_REJECT },
 214         { "reset6",             TOK_RESET6 },
 215         { "reset",              TOK_RESET },
 216         { "unreach6",           TOK_UNREACH6 },
 217         { "unreach",            TOK_UNREACH },
 218         { "check-state",        TOK_CHECKSTATE },
 219         { "//",                 TOK_COMMENT },
 220         { "nat",                TOK_NAT },
 221         { "reass",              TOK_REASS },
 222         { "setfib",             TOK_SETFIB },
 223         { NULL, 0 }     /* terminator */
 224 };
 225
 226 static struct _s_x rule_action_params[] = {
 227         { "altq",               TOK_ALTQ },
 228         { "log",                TOK_LOG },
 229         { "tag",                TOK_TAG },
 230         { "untag",              TOK_UNTAG },
 231         { NULL, 0 }     /* terminator */
 232 };
 233
 234 /*
 235  * The 'lookup' instruction accepts one of the following arguments.
 236  * -1 is a terminator for the list.
 237  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 238  */
 239 static int lookup_key[] = {
 240         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 241         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 242
 243 static struct _s_x rule_options[] = {
 244         { "tagged",             TOK_TAGGED },
 245         { "uid",                TOK_UID },
 246         { "gid",                TOK_GID },
 247         { "jail",               TOK_JAIL },
 248         { "in",                 TOK_IN },
 249         { "limit",              TOK_LIMIT },
 250         { "keep-state",         TOK_KEEPSTATE },
 251         { "bridged",            TOK_LAYER2 },
 252         { "layer2",             TOK_LAYER2 },
 253         { "out",                TOK_OUT },
 254         { "diverted",           TOK_DIVERTED },
 255         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 256         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 257         { "xmit",               TOK_XMIT },
 258         { "recv",               TOK_RECV },
 259         { "via",                TOK_VIA },
 260         { "fragment",           TOK_FRAG },
 261         { "frag",               TOK_FRAG },
 262         { "fib",                TOK_FIB },
 263         { "ipoptions",          TOK_IPOPTS },
 264         { "ipopts",             TOK_IPOPTS },
 265         { "iplen",              TOK_IPLEN },
 266         { "ipid",               TOK_IPID },
 267         { "ipprecedence",       TOK_IPPRECEDENCE },
 268         { "dscp",               TOK_DSCP },
 269         { "iptos",              TOK_IPTOS },
 270         { "ipttl",              TOK_IPTTL },
 271         { "ipversion",          TOK_IPVER },
 272         { "ipver",              TOK_IPVER },
 273         { "estab",              TOK_ESTAB },
 274         { "established",        TOK_ESTAB },
 275         { "setup",              TOK_SETUP },
 276         { "tcpdatalen",         TOK_TCPDATALEN },
 277         { "tcpflags",           TOK_TCPFLAGS },
 278         { "tcpflgs",            TOK_TCPFLAGS },
 279         { "tcpoptions",         TOK_TCPOPTS },
 280         { "tcpopts",            TOK_TCPOPTS },
 281         { "tcpseq",             TOK_TCPSEQ },
 282         { "tcpack",             TOK_TCPACK },
 283         { "tcpwin",             TOK_TCPWIN },
 284         { "icmptype",           TOK_ICMPTYPES },
 285         { "icmptypes",          TOK_ICMPTYPES },
 286         { "dst-ip",             TOK_DSTIP },
 287         { "src-ip",             TOK_SRCIP },
 288         { "dst-port",           TOK_DSTPORT },
 289         { "src-port",           TOK_SRCPORT },
 290         { "proto",              TOK_PROTO },
 291         { "MAC",                TOK_MAC },
 292         { "mac",                TOK_MAC },
 293         { "mac-type",           TOK_MACTYPE },
 294         { "verrevpath",         TOK_VERREVPATH },
 295         { "versrcreach",        TOK_VERSRCREACH },
 296         { "antispoof",          TOK_ANTISPOOF },
 297         { "ipsec",              TOK_IPSEC },
 298         { "icmp6type",          TOK_ICMP6TYPES },
 299         { "icmp6types",         TOK_ICMP6TYPES },
 300         { "ext6hdr",            TOK_EXT6HDR},
 301         { "flow-id",            TOK_FLOWID},
 302         { "ipv6",               TOK_IPV6},
 303         { "ip6",                TOK_IPV6},
 304         { "ipv4",               TOK_IPV4},
 305         { "ip4",                TOK_IPV4},
 306         { "dst-ipv6",           TOK_DSTIP6},
 307         { "dst-ip6",            TOK_DSTIP6},
 308         { "src-ipv6",           TOK_SRCIP6},
 309         { "src-ip6",            TOK_SRCIP6},
 310         { "lookup",             TOK_LOOKUP},
 311         { "//",                 TOK_COMMENT },
 312
 313         { "not",                TOK_NOT },              /* pseudo option */
 314         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 315         { "or",                 TOK_OR },               /* pseudo option */
 316         { "|", /* escape */     TOK_OR },               /* pseudo option */
 317         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 318         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 319         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 320         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 321         { NULL, 0 }     /* terminator */
 322 };
 323
 324 /*
 325  * Helper routine to print a possibly unaligned uint64_t on
 326  * various platform. If width > 0, print the value with
 327  * the desired width, followed by a space;
 328  * otherwise, return the required width.
 329  */
 330 int
 331 pr_u64(uint64_t *pd, int width)
 332 {
 333 #ifdef TCC
 334 #define U64_FMT "I64"
 335 #else
 336 #define U64_FMT "llu"
 337 #endif
 338         uint64_t u;
 339         unsigned long long d;
 340
 341         bcopy (pd, &u, sizeof(u));
 342         d = u;
 343         return (width > 0) ?
 344                 printf("%*" U64_FMT " ", width, d) :
 345                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 346 #undef U64_FMT
 347 }
 348
 349 void *
 350 safe_calloc(size_t number, size_t size)
 351 {
 352         void *ret = calloc(number, size);
 353
 354         if (ret == NULL)
 355                 err(EX_OSERR, "calloc");
 356         return ret;
 357 }
 358
 359 void *
 360 safe_realloc(void *ptr, size_t size)
 361 {
 362         void *ret = realloc(ptr, size);
 363
 364         if (ret == NULL)
 365                 err(EX_OSERR, "realloc");
 366         return ret;
 367 }
 368
 369 /*
 370  * conditionally runs the command.
 371  * Selected options or negative -> getsockopt
 372  */
 373 int
 374 do_cmd(int optname, void *optval, uintptr_t optlen)
 375 {
 376         static int s = -1;      /* the socket */
 377         int i;
 378
 379         if (co.test_only)
 380                 return 0;
 381
 382         if (s == -1)
 383                 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 384         if (s < 0)
 385                 err(EX_UNAVAILABLE, "socket");
 386
 387         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 388             optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST ||
 389             optname == IP_FW_TABLE_GETSIZE ||
 390             optname == IP_FW_NAT_GET_CONFIG ||
 391             optname < 0 ||
 392             optname == IP_FW_NAT_GET_LOG) {
 393                 if (optname < 0)
 394                         optname = -optname;
 395                 i = getsockopt(s, IPPROTO_IP, optname, optval,
 396                         (socklen_t *)optlen);
 397         } else {
 398                 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen);
 399         }
 400         return i;
 401 }
 402
 403 /**
 404  * match_token takes a table and a string, returns the value associated
 405  * with the string (-1 in case of failure).
 406  */
 407 int
 408 match_token(struct _s_x *table, char *string)
 409 {
 410         struct _s_x *pt;
 411         uint i = strlen(string);
 412
 413         for (pt = table ; i && pt->s != NULL ; pt++)
 414                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 415                         return pt->x;
 416         return -1;
 417 }
 418
 419 /**
 420  * match_value takes a table and a value, returns the string associated
 421  * with the value (NULL in case of failure).
 422  */
 423 char const *
 424 match_value(struct _s_x *p, int value)
 425 {
 426         for (; p->s != NULL; p++)
 427                 if (p->x == value)
 428                         return p->s;
 429         return NULL;
 430 }
 431
 432 /*
 433  * _substrcmp takes two strings and returns 1 if they do not match,
 434  * and 0 if they match exactly or the first string is a sub-string
 435  * of the second.  A warning is printed to stderr in the case that the
 436  * first string is a sub-string of the second.
 437  *
 438  * This function will be removed in the future through the usual
 439  * deprecation process.
 440  */
 441 int
 442 _substrcmp(const char *str1, const char* str2)
 443 {
 444
 445         if (strncmp(str1, str2, strlen(str1)) != 0)
 446                 return 1;
 447
 448         if (strlen(str1) != strlen(str2))
 449                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 450                     str1, str2);
 451         return 0;
 452 }
 453
 454 /*
 455  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 456  * and 0 if they match exactly or the second string is a sub-string
 457  * of the first.  A warning is printed to stderr in the case that the
 458  * first string does not match the third.
 459  *
 460  * This function exists to warn about the bizzare construction
 461  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 462  * for "bytes".  The problem is that in addition to accepting "by",
 463  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 464  * other string beginning with "by".
 465  *
 466  * This function will be removed in the future through the usual
 467  * deprecation process.
 468  */
 469 int
 470 _substrcmp2(const char *str1, const char* str2, const char* str3)
 471 {
 472
 473         if (strncmp(str1, str2, strlen(str2)) != 0)
 474                 return 1;
 475
 476         if (strcmp(str1, str3) != 0)
 477                 warnx("DEPRECATED: '%s' matched '%s'",
 478                     str1, str3);
 479         return 0;
 480 }
 481
 482 /*
 483  * prints one port, symbolic or numeric
 484  */
 485 static void
 486 print_port(int proto, uint16_t port)
 487 {
 488
 489         if (proto == IPPROTO_ETHERTYPE) {
 490                 char const *s;
 491
 492                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 493                         printf("%s", s);
 494                 else
 495                         printf("0x%04x", port);
 496         } else {
 497                 struct servent *se = NULL;
 498                 if (co.do_resolv) {
 499                         struct protoent *pe = getprotobynumber(proto);
 500
 501                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 502                 }
 503                 if (se)
 504                         printf("%s", se->s_name);
 505                 else
 506                         printf("%d", port);
 507         }
 508 }
 509
 510 static struct _s_x _port_name[] = {
 511         {"dst-port",    O_IP_DSTPORT},
 512         {"src-port",    O_IP_SRCPORT},
 513         {"ipid",        O_IPID},
 514         {"iplen",       O_IPLEN},
 515         {"ipttl",       O_IPTTL},
 516         {"mac-type",    O_MAC_TYPE},
 517         {"tcpdatalen",  O_TCPDATALEN},
 518         {"tagged",      O_TAGGED},
 519         {NULL,          0}
 520 };
 521
 522 /*
 523  * Print the values in a list 16-bit items of the types above.
 524  * XXX todo: add support for mask.
 525  */
 526 static void
 527 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 528 {
 529         uint16_t *p = cmd->ports;
 530         int i;
 531         char const *sep;
 532
 533         if (opcode != 0) {
 534                 sep = match_value(_port_name, opcode);
 535                 if (sep == NULL)
 536                         sep = "???";
 537                 printf (" %s", sep);
 538         }
 539         sep = " ";
 540         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 541                 printf("%s", sep);
 542                 print_port(proto, p[0]);
 543                 if (p[0] != p[1]) {
 544                         printf("-");
 545                         print_port(proto, p[1]);
 546                 }
 547                 sep = ",";
 548         }
 549 }
 550
 551 /*
 552  * Like strtol, but also translates service names into port numbers
 553  * for some protocols.
 554  * In particular:
 555  *      proto == -1 disables the protocol check;
 556  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 557  *      proto == <some value in /etc/protocols> matches the values there.
 558  * Returns *end == s in case the parameter is not found.
 559  */
 560 static int
 561 strtoport(char *s, char **end, int base, int proto)
 562 {
 563         char *p, *buf;
 564         char *s1;
 565         int i;
 566
 567         *end = s;               /* default - not found */
 568         if (*s == '\0')
 569                 return 0;       /* not found */
 570
 571         if (isdigit(*s))
 572                 return strtol(s, end, base);
 573
 574         /*
 575          * find separator. '\\' escapes the next char.
 576          */
 577         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 578                 if (*s1 == '\\' && s1[1] != '\0')
 579                         s1++;
 580
 581         buf = safe_calloc(s1 - s + 1, 1);
 582
 583         /*
 584          * copy into a buffer skipping backslashes
 585          */
 586         for (p = s, i = 0; p != s1 ; p++)
 587                 if (*p != '\\')
 588                         buf[i++] = *p;
 589         buf[i++] = '\0';
 590
 591         if (proto == IPPROTO_ETHERTYPE) {
 592                 i = match_token(ether_types, buf);
 593                 free(buf);
 594                 if (i != -1) {  /* found */
 595                         *end = s1;
 596                         return i;
 597                 }
 598         } else {
 599                 struct protoent *pe = NULL;
 600                 struct servent *se;
 601
 602                 if (proto != 0)
 603                         pe = getprotobynumber(proto);
 604                 setservent(1);
 605                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 606                 free(buf);
 607                 if (se != NULL) {
 608                         *end = s1;
 609                         return ntohs(se->s_port);
 610                 }
 611         }
 612         return 0;       /* not found */
 613 }
 614
 615 /*
 616  * Fill the body of the command with the list of port ranges.
 617  */
 618 static int
 619 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 620 {
 621         uint16_t a, b, *p = cmd->ports;
 622         int i = 0;
 623         char *s = av;
 624
 625         while (*s) {
 626                 a = strtoport(av, &s, 0, proto);
 627                 if (s == av)                    /* empty or invalid argument */
 628                         return (0);
 629
 630                 switch (*s) {
 631                 case '-':                       /* a range */
 632                         av = s + 1;
 633                         b = strtoport(av, &s, 0, proto);
 634                         /* Reject expressions like '1-abc' or '1-2-3'. */
 635                         if (s == av || (*s != ',' && *s != '\0'))
 636                                 return (0);
 637                         p[0] = a;
 638                         p[1] = b;
 639                         break;
 640                 case ',':                       /* comma separated list */
 641                 case '\0':
 642                         p[0] = p[1] = a;
 643                         break;
 644                 default:
 645                         warnx("port list: invalid separator <%c> in <%s>",
 646                                 *s, av);
 647                         return (0);
 648                 }
 649
 650                 i++;
 651                 p += 2;
 652                 av = s + 1;
 653         }
 654         if (i > 0) {
 655                 if (i + 1 > F_LEN_MASK)
 656                         errx(EX_DATAERR, "too many ports/ranges\n");
 657                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 658         }
 659         return (i);
 660 }
 661
 662 static struct _s_x icmpcodes[] = {
 663       { "net",                  ICMP_UNREACH_NET },
 664       { "host",                 ICMP_UNREACH_HOST },
 665       { "protocol",             ICMP_UNREACH_PROTOCOL },
 666       { "port",                 ICMP_UNREACH_PORT },
 667       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 668       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 669       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 670       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 671       { "isolated",             ICMP_UNREACH_ISOLATED },
 672       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 673       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 674       { "tosnet",               ICMP_UNREACH_TOSNET },
 675       { "toshost",              ICMP_UNREACH_TOSHOST },
 676       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 677       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 678       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 679       { NULL, 0 }
 680 };
 681
 682 static void
 683 fill_reject_code(u_short *codep, char *str)
 684 {
 685         int val;
 686         char *s;
 687
 688         val = strtoul(str, &s, 0);
 689         if (s == str || *s != '\0' || val >= 0x100)
 690                 val = match_token(icmpcodes, str);
 691         if (val < 0)
 692                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 693         *codep = val;
 694         return;
 695 }
 696
 697 static void
 698 print_reject_code(uint16_t code)
 699 {
 700         char const *s = match_value(icmpcodes, code);
 701
 702         if (s != NULL)
 703                 printf("unreach %s", s);
 704         else
 705                 printf("unreach %u", code);
 706 }
 707
 708 /*
 709  * Returns the number of bits set (from left) in a contiguous bitmask,
 710  * or -1 if the mask is not contiguous.
 711  * XXX this needs a proper fix.
 712  * This effectively works on masks in big-endian (network) format.
 713  * when compiled on little endian architectures.
 714  *
 715  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 716  * the first bit on the wire is bit 0 of the first byte.
 717  * len is the max length in bits.
 718  */
 719 int
 720 contigmask(uint8_t *p, int len)
 721 {
 722         int i, n;
 723
 724         for (i=0; i<len ; i++)
 725                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 726                         break;
 727         for (n=i+1; n < len; n++)
 728                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 729                         return -1; /* mask not contiguous */
 730         return i;
 731 }
 732
 733 /*
 734  * print flags set/clear in the two bitmasks passed as parameters.
 735  * There is a specialized check for f_tcpflags.
 736  */
 737 static void
 738 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 739 {
 740         char const *comma = "";
 741         int i;
 742         uint8_t set = cmd->arg1 & 0xff;
 743         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 744
 745         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 746                 printf(" setup");
 747                 return;
 748         }
 749
 750         printf(" %s ", name);
 751         for (i=0; list[i].x != 0; i++) {
 752                 if (set & list[i].x) {
 753                         set &= ~list[i].x;
 754                         printf("%s%s", comma, list[i].s);
 755                         comma = ",";
 756                 }
 757                 if (clear & list[i].x) {
 758                         clear &= ~list[i].x;
 759                         printf("%s!%s", comma, list[i].s);
 760                         comma = ",";
 761                 }
 762         }
 763 }
 764
 765 /*
 766  * Print the ip address contained in a command.
 767  */
 768 static void
 769 print_ip(ipfw_insn_ip *cmd, char const *s)
 770 {
 771         struct hostent *he = NULL;
 772         uint32_t len = F_LEN((ipfw_insn *)cmd);
 773         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 774
 775         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 776                 uint32_t d = a[1];
 777                 const char *arg = "<invalid>";
 778
 779                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 780                         arg = match_value(rule_options, lookup_key[d]);
 781                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 782                         arg, cmd->o.arg1);
 783                 return;
 784         }
 785         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 786
 787         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 788                 printf("me");
 789                 return;
 790         }
 791         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 792             cmd->o.opcode == O_IP_DST_LOOKUP) {
 793                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 794                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 795                         printf(",%u", *a);
 796                 printf(")");
 797                 return;
 798         }
 799         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 800                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 801                 int i, j;
 802                 char comma = '{';
 803
 804                 x = cmd->o.arg1 - 1;
 805                 x = htonl( ~x );
 806                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 807                 printf("%s/%d", inet_ntoa(cmd->addr),
 808                         contigmask((uint8_t *)&x, 32));
 809                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 810                 x &= 0xff; /* base */
 811                 /*
 812                  * Print bits and ranges.
 813                  * Locate first bit set (i), then locate first bit unset (j).
 814                  * If we have 3+ consecutive bits set, then print them as a
 815                  * range, otherwise only print the initial bit and rescan.
 816                  */
 817                 for (i=0; i < cmd->o.arg1; i++)
 818                         if (map[i/32] & (1<<(i & 31))) {
 819                                 for (j=i+1; j < cmd->o.arg1; j++)
 820                                         if (!(map[ j/32] & (1<<(j & 31))))
 821                                                 break;
 822                                 printf("%c%d", comma, i+x);
 823                                 if (j>i+2) { /* range has at least 3 elements */
 824                                         printf("-%d", j-1+x);
 825                                         i = j-1;
 826                                 }
 827                                 comma = ',';
 828                         }
 829                 printf("}");
 830                 return;
 831         }
 832         /*
 833          * len == 2 indicates a single IP, whereas lists of 1 or more
 834          * addr/mask pairs have len = (2n+1). We convert len to n so we
 835          * use that to count the number of entries.
 836          */
 837     for (len = len / 2; len > 0; len--, a += 2) {
 838         int mb =        /* mask length */
 839             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 840                 32 : contigmask((uint8_t *)&(a[1]), 32);
 841         if (mb == 32 && co.do_resolv)
 842                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 843         if (he != NULL)         /* resolved to name */
 844                 printf("%s", he->h_name);
 845         else if (mb == 0)       /* any */
 846                 printf("any");
 847         else {          /* numeric IP followed by some kind of mask */
 848                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 849                 if (mb < 0)
 850                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 851                 else if (mb < 32)
 852                         printf("/%d", mb);
 853         }
 854         if (len > 1)
 855                 printf(",");
 856     }
 857 }
 858
 859 /*
 860  * prints a MAC address/mask pair
 861  */
 862 static void
 863 print_mac(uint8_t *addr, uint8_t *mask)
 864 {
 865         int l = contigmask(mask, 48);
 866
 867         if (l == 0)
 868                 printf(" any");
 869         else {
 870                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 871                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 872                 if (l == -1)
 873                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 874                             mask[0], mask[1], mask[2],
 875                             mask[3], mask[4], mask[5]);
 876                 else if (l < 48)
 877                         printf("/%d", l);
 878         }
 879 }
 880
 881 static void
 882 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 883 {
 884         uint8_t type;
 885
 886         cmd->d[0] = 0;
 887         while (*av) {
 888                 if (*av == ',')
 889                         av++;
 890
 891                 type = strtoul(av, &av, 0);
 892
 893                 if (*av != ',' && *av != '\0')
 894                         errx(EX_DATAERR, "invalid ICMP type");
 895
 896                 if (type > 31)
 897                         errx(EX_DATAERR, "ICMP type out of range");
 898
 899                 cmd->d[0] |= 1 << type;
 900         }
 901         cmd->o.opcode = O_ICMPTYPE;
 902         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 903 }
 904
 905 static void
 906 print_icmptypes(ipfw_insn_u32 *cmd)
 907 {
 908         int i;
 909         char sep= ' ';
 910
 911         printf(" icmptypes");
 912         for (i = 0; i < 32; i++) {
 913                 if ( (cmd->d[0] & (1 << (i))) == 0)
 914                         continue;
 915                 printf("%c%d", sep, i);
 916                 sep = ',';
 917         }
 918 }
 919
 920 /*
 921  * show_ipfw() prints the body of an ipfw rule.
 922  * Because the standard rule has at least proto src_ip dst_ip, we use
 923  * a helper function to produce these entries if not provided explicitly.
 924  * The first argument is the list of fields we have, the second is
 925  * the list of fields we want to be printed.
 926  *
 927  * Special cases if we have provided a MAC header:
 928  *   + if the rule does not contain IP addresses/ports, do not print them;
 929  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 930  *
 931  * Once we have 'have_options', IP header fields are printed as options.
 932  */
 933 #define HAVE_PROTO      0x0001
 934 #define HAVE_SRCIP      0x0002
 935 #define HAVE_DSTIP      0x0004
 936 #define HAVE_PROTO4     0x0008
 937 #define HAVE_PROTO6     0x0010
 938 #define HAVE_IP         0x0100
 939 #define HAVE_OPTIONS    0x8000
 940
 941 static void
 942 show_prerequisites(int *flags, int want, int cmd __unused)
 943 {
 944         if (co.comment_only)
 945                 return;
 946         if ( (*flags & HAVE_IP) == HAVE_IP)
 947                 *flags |= HAVE_OPTIONS;
 948
 949         if ( !(*flags & HAVE_OPTIONS)) {
 950                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
 951                         if ( (*flags & HAVE_PROTO4))
 952                                 printf(" ip4");
 953                         else if ( (*flags & HAVE_PROTO6))
 954                                 printf(" ip6");
 955                         else
 956                                 printf(" ip");
 957                 }
 958                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 959                         printf(" from any");
 960                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 961                         printf(" to any");
 962         }
 963         *flags |= want;
 964 }
 965
 966 static void
 967 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 968 {
 969         static int twidth = 0;
 970         int l;
 971         ipfw_insn *cmd, *tagptr = NULL;
 972         const char *comment = NULL;     /* ptr to comment if we have one */
 973         int proto = 0;          /* default */
 974         int flags = 0;  /* prerequisites */
 975         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 976         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
 977         int or_block = 0;       /* we are in an or block */
 978         uint32_t set_disable;
 979
 980         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
 981
 982         if (set_disable & (1 << rule->set)) { /* disabled */
 983                 if (!co.show_sets)
 984                         return;
 985                 else
 986                         printf("# DISABLED ");
 987         }
 988         printf("%05u ", rule->rulenum);
 989
 990         if (pcwidth > 0 || bcwidth > 0) {
 991                 pr_u64(&rule->pcnt, pcwidth);
 992                 pr_u64(&rule->bcnt, bcwidth);
 993         }
 994
 995         if (co.do_time == 2)
 996                 printf("%10u ", rule->timestamp);
 997         else if (co.do_time == 1) {
 998                 char timestr[30];
 999                 time_t t = (time_t)0;
1000
1001                 if (twidth == 0) {
1002                         strcpy(timestr, ctime(&t));
1003                         *strchr(timestr, '\n') = '\0';
1004                         twidth = strlen(timestr);
1005                 }
1006                 if (rule->timestamp) {
1007                         t = _long_to_time(rule->timestamp);
1008
1009                         strcpy(timestr, ctime(&t));
1010                         *strchr(timestr, '\n') = '\0';
1011                         printf("%s ", timestr);
1012                 } else {
1013                         printf("%*s", twidth, " ");
1014                 }
1015         }
1016
1017         if (co.show_sets)
1018                 printf("set %d ", rule->set);
1019
1020         /*
1021          * print the optional "match probability"
1022          */
1023         if (rule->cmd_len > 0) {
1024                 cmd = rule->cmd ;
1025                 if (cmd->opcode == O_PROB) {
1026                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1027                         double d = 1.0 * p->d[0];
1028
1029                         d = (d / 0x7fffffff);
1030                         printf("prob %f ", d);
1031                 }
1032         }
1033
1034         /*
1035          * first print actions
1036          */
1037         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1038                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1039                 switch(cmd->opcode) {
1040                 case O_CHECK_STATE:
1041                         printf("check-state");
1042                         /* avoid printing anything else */
1043                         flags = HAVE_PROTO | HAVE_SRCIP |
1044                                 HAVE_DSTIP | HAVE_IP;
1045                         break;
1046
1047                 case O_ACCEPT:
1048                         printf("allow");
1049                         break;
1050
1051                 case O_COUNT:
1052                         printf("count");
1053                         break;
1054
1055                 case O_DENY:
1056                         printf("deny");
1057                         break;
1058
1059                 case O_REJECT:
1060                         if (cmd->arg1 == ICMP_REJECT_RST)
1061                                 printf("reset");
1062                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1063                                 printf("reject");
1064                         else
1065                                 print_reject_code(cmd->arg1);
1066                         break;
1067
1068                 case O_UNREACH6:
1069                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1070                                 printf("reset6");
1071                         else
1072                                 print_unreach6_code(cmd->arg1);
1073                         break;
1074
1075                 case O_SKIPTO:
1076                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1077                         break;
1078
1079                 case O_PIPE:
1080                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1081                         break;
1082
1083                 case O_QUEUE:
1084                         PRINT_UINT_ARG("queue ", cmd->arg1);
1085                         break;
1086
1087                 case O_DIVERT:
1088                         PRINT_UINT_ARG("divert ", cmd->arg1);
1089                         break;
1090
1091                 case O_TEE:
1092                         PRINT_UINT_ARG("tee ", cmd->arg1);
1093                         break;
1094
1095                 case O_NETGRAPH:
1096                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1097                         break;
1098
1099                 case O_NGTEE:
1100                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1101                         break;
1102
1103                 case O_FORWARD_IP:
1104                     {
1105                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1106
1107                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1108                                 printf("fwd tablearg");
1109                         } else {
1110                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1111                         }
1112                         if (s->sa.sin_port)
1113                                 printf(",%d", s->sa.sin_port);
1114                     }
1115                         break;
1116
1117                 case O_LOG: /* O_LOG is printed last */
1118                         logptr = (ipfw_insn_log *)cmd;
1119                         break;
1120
1121                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1122                         altqptr = (ipfw_insn_altq *)cmd;
1123                         break;
1124
1125                 case O_TAG:
1126                         tagptr = cmd;
1127                         break;
1128
1129                 case O_NAT:
1130                         PRINT_UINT_ARG("nat ", cmd->arg1);
1131                         break;
1132
1133                 case O_SETFIB:
1134                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1135                         break;
1136
1137                 case O_REASS:
1138                         printf("reass");
1139                         break;
1140
1141                 default:
1142                         printf("** unrecognized action %d len %d ",
1143                                 cmd->opcode, cmd->len);
1144                 }
1145         }
1146         if (logptr) {
1147                 if (logptr->max_log > 0)
1148                         printf(" log logamount %d", logptr->max_log);
1149                 else
1150                         printf(" log");
1151         }
1152 #ifndef NO_ALTQ
1153         if (altqptr) {
1154                 print_altq_cmd(altqptr);
1155         }
1156 #endif
1157         if (tagptr) {
1158                 if (tagptr->len & F_NOT)
1159                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1160                 else
1161                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1162         }
1163
1164         /*
1165          * then print the body.
1166          */
1167         for (l = rule->act_ofs, cmd = rule->cmd ;
1168                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1169                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1170                         continue;
1171                 if (cmd->opcode == O_IP4) {
1172                         flags |= HAVE_PROTO4;
1173                         break;
1174                 } else if (cmd->opcode == O_IP6) {
1175                         flags |= HAVE_PROTO6;
1176                         break;
1177                 }
1178         }
1179         if (rule->_pad & 1) {   /* empty rules before options */
1180                 if (!co.do_compact) {
1181                         show_prerequisites(&flags, HAVE_PROTO, 0);
1182                         printf(" from any to any");
1183                 }
1184                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1185                          HAVE_SRCIP | HAVE_DSTIP;
1186         }
1187
1188         if (co.comment_only)
1189                 comment = "...";
1190
1191         for (l = rule->act_ofs, cmd = rule->cmd ;
1192                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1193                 /* useful alias */
1194                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1195
1196                 if (co.comment_only) {
1197                         if (cmd->opcode != O_NOP)
1198                                 continue;
1199                         printf(" // %s\n", (char *)(cmd + 1));
1200                         return;
1201                 }
1202
1203                 show_prerequisites(&flags, 0, cmd->opcode);
1204
1205                 switch(cmd->opcode) {
1206                 case O_PROB:
1207                         break;  /* done already */
1208
1209                 case O_PROBE_STATE:
1210                         break; /* no need to print anything here */
1211
1212                 case O_IP_SRC:
1213                 case O_IP_SRC_LOOKUP:
1214                 case O_IP_SRC_MASK:
1215                 case O_IP_SRC_ME:
1216                 case O_IP_SRC_SET:
1217                         show_prerequisites(&flags, HAVE_PROTO, 0);
1218                         if (!(flags & HAVE_SRCIP))
1219                                 printf(" from");
1220                         if ((cmd->len & F_OR) && !or_block)
1221                                 printf(" {");
1222                         print_ip((ipfw_insn_ip *)cmd,
1223                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1224                         flags |= HAVE_SRCIP;
1225                         break;
1226
1227                 case O_IP_DST:
1228                 case O_IP_DST_LOOKUP:
1229                 case O_IP_DST_MASK:
1230                 case O_IP_DST_ME:
1231                 case O_IP_DST_SET:
1232                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1233                         if (!(flags & HAVE_DSTIP))
1234                                 printf(" to");
1235                         if ((cmd->len & F_OR) && !or_block)
1236                                 printf(" {");
1237                         print_ip((ipfw_insn_ip *)cmd,
1238                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1239                         flags |= HAVE_DSTIP;
1240                         break;
1241
1242                 case O_IP6_SRC:
1243                 case O_IP6_SRC_MASK:
1244                 case O_IP6_SRC_ME:
1245                         show_prerequisites(&flags, HAVE_PROTO, 0);
1246                         if (!(flags & HAVE_SRCIP))
1247                                 printf(" from");
1248                         if ((cmd->len & F_OR) && !or_block)
1249                                 printf(" {");
1250                         print_ip6((ipfw_insn_ip6 *)cmd,
1251                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1252                         flags |= HAVE_SRCIP | HAVE_PROTO;
1253                         break;
1254
1255                 case O_IP6_DST:
1256                 case O_IP6_DST_MASK:
1257                 case O_IP6_DST_ME:
1258                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1259                         if (!(flags & HAVE_DSTIP))
1260                                 printf(" to");
1261                         if ((cmd->len & F_OR) && !or_block)
1262                                 printf(" {");
1263                         print_ip6((ipfw_insn_ip6 *)cmd,
1264                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1265                         flags |= HAVE_DSTIP;
1266                         break;
1267
1268                 case O_FLOW6ID:
1269                 print_flow6id( (ipfw_insn_u32 *) cmd );
1270                 flags |= HAVE_OPTIONS;
1271                 break;
1272
1273                 case O_IP_DSTPORT:
1274                         show_prerequisites(&flags,
1275                                 HAVE_PROTO | HAVE_SRCIP |
1276                                 HAVE_DSTIP | HAVE_IP, 0);
1277                 case O_IP_SRCPORT:
1278                         show_prerequisites(&flags,
1279                                 HAVE_PROTO | HAVE_SRCIP, 0);
1280                         if ((cmd->len & F_OR) && !or_block)
1281                                 printf(" {");
1282                         if (cmd->len & F_NOT)
1283                                 printf(" not");
1284                         print_newports((ipfw_insn_u16 *)cmd, proto,
1285                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1286                         break;
1287
1288                 case O_PROTO: {
1289                         struct protoent *pe = NULL;
1290
1291                         if ((cmd->len & F_OR) && !or_block)
1292                                 printf(" {");
1293                         if (cmd->len & F_NOT)
1294                                 printf(" not");
1295                         proto = cmd->arg1;
1296                         pe = getprotobynumber(cmd->arg1);
1297                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1298                             !(flags & HAVE_PROTO))
1299                                 show_prerequisites(&flags,
1300                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1301                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1302                         if (flags & HAVE_OPTIONS)
1303                                 printf(" proto");
1304                         if (pe)
1305                                 printf(" %s", pe->p_name);
1306                         else
1307                                 printf(" %u", cmd->arg1);
1308                         }
1309                         flags |= HAVE_PROTO;
1310                         break;
1311
1312                 default: /*options ... */
1313                         if (!(cmd->len & (F_OR|F_NOT)))
1314                                 if (((cmd->opcode == O_IP6) &&
1315                                     (flags & HAVE_PROTO6)) ||
1316                                     ((cmd->opcode == O_IP4) &&
1317                                     (flags & HAVE_PROTO4)))
1318                                         break;
1319                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1320                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1321                         if ((cmd->len & F_OR) && !or_block)
1322                                 printf(" {");
1323                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1324                                 printf(" not");
1325                         switch(cmd->opcode) {
1326                         case O_MACADDR2: {
1327                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1328
1329                                 printf(" MAC");
1330                                 print_mac(m->addr, m->mask);
1331                                 print_mac(m->addr + 6, m->mask + 6);
1332                                 }
1333                                 break;
1334
1335                         case O_MAC_TYPE:
1336                                 print_newports((ipfw_insn_u16 *)cmd,
1337                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1338                                 break;
1339
1340
1341                         case O_FRAG:
1342                                 printf(" frag");
1343                                 break;
1344
1345                         case O_FIB:
1346                                 printf(" fib %u", cmd->arg1 );
1347                                 break;
1348
1349                         case O_IN:
1350                                 printf(cmd->len & F_NOT ? " out" : " in");
1351                                 break;
1352
1353                         case O_DIVERTED:
1354                                 switch (cmd->arg1) {
1355                                 case 3:
1356                                         printf(" diverted");
1357                                         break;
1358                                 case 1:
1359                                         printf(" diverted-loopback");
1360                                         break;
1361                                 case 2:
1362                                         printf(" diverted-output");
1363                                         break;
1364                                 default:
1365                                         printf(" diverted-?<%u>", cmd->arg1);
1366                                         break;
1367                                 }
1368                                 break;
1369
1370                         case O_LAYER2:
1371                                 printf(" layer2");
1372                                 break;
1373                         case O_XMIT:
1374                         case O_RECV:
1375                         case O_VIA:
1376                             {
1377                                 char const *s;
1378                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1379
1380                                 if (cmd->opcode == O_XMIT)
1381                                         s = "xmit";
1382                                 else if (cmd->opcode == O_RECV)
1383                                         s = "recv";
1384                                 else /* if (cmd->opcode == O_VIA) */
1385                                         s = "via";
1386                                 if (cmdif->name[0] == '\0')
1387                                         printf(" %s %s", s,
1388                                             inet_ntoa(cmdif->p.ip));
1389                                 else
1390                                         printf(" %s %s", s, cmdif->name);
1391
1392                                 break;
1393                             }
1394                         case O_IPID:
1395                                 if (F_LEN(cmd) == 1)
1396                                     printf(" ipid %u", cmd->arg1 );
1397                                 else
1398                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1399                                         O_IPID);
1400                                 break;
1401
1402                         case O_IPTTL:
1403                                 if (F_LEN(cmd) == 1)
1404                                     printf(" ipttl %u", cmd->arg1 );
1405                                 else
1406                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1407                                         O_IPTTL);
1408                                 break;
1409
1410                         case O_IPVER:
1411                                 printf(" ipver %u", cmd->arg1 );
1412                                 break;
1413
1414                         case O_IPPRECEDENCE:
1415                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1416                                 break;
1417
1418                         case O_IPLEN:
1419                                 if (F_LEN(cmd) == 1)
1420                                     printf(" iplen %u", cmd->arg1 );
1421                                 else
1422                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1423                                         O_IPLEN);
1424                                 break;
1425
1426                         case O_IPOPT:
1427                                 print_flags("ipoptions", cmd, f_ipopts);
1428                                 break;
1429
1430                         case O_IPTOS:
1431                                 print_flags("iptos", cmd, f_iptos);
1432                                 break;
1433
1434                         case O_ICMPTYPE:
1435                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1436                                 break;
1437
1438                         case O_ESTAB:
1439                                 printf(" established");
1440                                 break;
1441
1442                         case O_TCPDATALEN:
1443                                 if (F_LEN(cmd) == 1)
1444                                     printf(" tcpdatalen %u", cmd->arg1 );
1445                                 else
1446                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1447                                         O_TCPDATALEN);
1448                                 break;
1449
1450                         case O_TCPFLAGS:
1451                                 print_flags("tcpflags", cmd, f_tcpflags);
1452                                 break;
1453
1454                         case O_TCPOPTS:
1455                                 print_flags("tcpoptions", cmd, f_tcpopts);
1456                                 break;
1457
1458                         case O_TCPWIN:
1459                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1460                                 break;
1461
1462                         case O_TCPACK:
1463                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1464                                 break;
1465
1466                         case O_TCPSEQ:
1467                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1468                                 break;
1469
1470                         case O_UID:
1471                             {
1472                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1473
1474                                 if (pwd)
1475                                         printf(" uid %s", pwd->pw_name);
1476                                 else
1477                                         printf(" uid %u", cmd32->d[0]);
1478                             }
1479                                 break;
1480
1481                         case O_GID:
1482                             {
1483                                 struct group *grp = getgrgid(cmd32->d[0]);
1484
1485                                 if (grp)
1486                                         printf(" gid %s", grp->gr_name);
1487                                 else
1488                                         printf(" gid %u", cmd32->d[0]);
1489                             }
1490                                 break;
1491
1492                         case O_JAIL:
1493                                 printf(" jail %d", cmd32->d[0]);
1494                                 break;
1495
1496                         case O_VERREVPATH:
1497                                 printf(" verrevpath");
1498                                 break;
1499
1500                         case O_VERSRCREACH:
1501                                 printf(" versrcreach");
1502                                 break;
1503
1504                         case O_ANTISPOOF:
1505                                 printf(" antispoof");
1506                                 break;
1507
1508                         case O_IPSEC:
1509                                 printf(" ipsec");
1510                                 break;
1511
1512                         case O_NOP:
1513                                 comment = (char *)(cmd + 1);
1514                                 break;
1515
1516                         case O_KEEP_STATE:
1517                                 printf(" keep-state");
1518                                 break;
1519
1520                         case O_LIMIT: {
1521                                 struct _s_x *p = limit_masks;
1522                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1523                                 uint8_t x = c->limit_mask;
1524                                 char const *comma = " ";
1525
1526                                 printf(" limit");
1527                                 for (; p->x != 0 ; p++)
1528                                         if ((x & p->x) == p->x) {
1529                                                 x &= ~p->x;
1530                                                 printf("%s%s", comma, p->s);
1531                                                 comma = ",";
1532                                         }
1533                                 PRINT_UINT_ARG(" ", c->conn_limit);
1534                                 break;
1535                         }
1536
1537                         case O_IP6:
1538                                 printf(" ip6");
1539                                 break;
1540
1541                         case O_IP4:
1542                                 printf(" ip4");
1543                                 break;
1544
1545                         case O_ICMP6TYPE:
1546                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1547                                 break;
1548
1549                         case O_EXT_HDR:
1550                                 print_ext6hdr( (ipfw_insn *) cmd );
1551                                 break;
1552
1553                         case O_TAGGED:
1554                                 if (F_LEN(cmd) == 1)
1555                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1556                                 else
1557                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1558                                             O_TAGGED);
1559                                 break;
1560
1561                         default:
1562                                 printf(" [opcode %d len %d]",
1563                                     cmd->opcode, cmd->len);
1564                         }
1565                 }
1566                 if (cmd->len & F_OR) {
1567                         printf(" or");
1568                         or_block = 1;
1569                 } else if (or_block) {
1570                         printf(" }");
1571                         or_block = 0;
1572                 }
1573         }
1574         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1575                                               | HAVE_IP, 0);
1576         if (comment)
1577                 printf(" // %s", comment);
1578         printf("\n");
1579 }
1580
1581 static void
1582 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1583 {
1584         struct protoent *pe;
1585         struct in_addr a;
1586         uint16_t rulenum;
1587         char buf[INET6_ADDRSTRLEN];
1588
1589         if (!co.do_expired) {
1590                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1591                         return;
1592         }
1593         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1594         printf("%05d", rulenum);
1595         if (pcwidth > 0 || bcwidth > 0) {
1596                 printf(" ");
1597                 pr_u64(&d->pcnt, pcwidth);
1598                 pr_u64(&d->bcnt, bcwidth);
1599                 printf("(%ds)", d->expire);
1600         }
1601         switch (d->dyn_type) {
1602         case O_LIMIT_PARENT:
1603                 printf(" PARENT %d", d->count);
1604                 break;
1605         case O_LIMIT:
1606                 printf(" LIMIT");
1607                 break;
1608         case O_KEEP_STATE: /* bidir, no mask */
1609                 printf(" STATE");
1610                 break;
1611         }
1612
1613         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1614                 printf(" %s", pe->p_name);
1615         else
1616                 printf(" proto %u", d->id.proto);
1617
1618         if (d->id.addr_type == 4) {
1619                 a.s_addr = htonl(d->id.src_ip);
1620                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1621
1622                 a.s_addr = htonl(d->id.dst_ip);
1623                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1624         } else if (d->id.addr_type == 6) {
1625                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1626                     sizeof(buf)), d->id.src_port);
1627                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1628                     sizeof(buf)), d->id.dst_port);
1629         } else
1630                 printf(" UNKNOWN <-> UNKNOWN\n");
1631
1632         printf("\n");
1633 }
1634
1635 /*
1636  * This one handles all set-related commands
1637  *      ipfw set { show | enable | disable }
1638  *      ipfw set swap X Y
1639  *      ipfw set move X to Y
1640  *      ipfw set move rule X to Y
1641  */
1642 void
1643 ipfw_sets_handler(char *av[])
1644 {
1645         uint32_t set_disable, masks[2];
1646         int i, nbytes;
1647         uint16_t rulenum;
1648         uint8_t cmd, new_set;
1649
1650         av++;
1651
1652         if (av[0] == NULL)
1653                 errx(EX_USAGE, "set needs command");
1654         if (_substrcmp(*av, "show") == 0) {
1655                 void *data = NULL;
1656                 char const *msg;
1657                 int nalloc;
1658
1659                 nalloc = nbytes = sizeof(struct ip_fw);
1660                 while (nbytes >= nalloc) {
1661                         if (data)
1662                                 free(data);
1663                         nalloc = nalloc * 2 + 200;
1664                         nbytes = nalloc;
1665                         data = safe_calloc(1, nbytes);
1666                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1667                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1668                 }
1669
1670                 bcopy(&((struct ip_fw *)data)->next_rule,
1671                         &set_disable, sizeof(set_disable));
1672
1673                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1674                         if ((set_disable & (1<<i))) {
1675                                 printf("%s %d", msg, i);
1676                                 msg = "";
1677                         }
1678                 msg = (set_disable) ? " enable" : "enable";
1679                 for (i = 0; i < RESVD_SET; i++)
1680                         if (!(set_disable & (1<<i))) {
1681                                 printf("%s %d", msg, i);
1682                                 msg = "";
1683                         }
1684                 printf("\n");
1685         } else if (_substrcmp(*av, "swap") == 0) {
1686                 av++;
1687                 if ( av[0] == NULL || av[1] == NULL )
1688                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1689                 rulenum = atoi(av[0]);
1690                 new_set = atoi(av[1]);
1691                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1692                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1693                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1694                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1695                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1696                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1697         } else if (_substrcmp(*av, "move") == 0) {
1698                 av++;
1699                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1700                         cmd = 2;
1701                         av++;
1702                 } else
1703                         cmd = 3;
1704                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1705                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1706                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1707                 rulenum = atoi(av[0]);
1708                 new_set = atoi(av[2]);
1709                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1710                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1711                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1712                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1713                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1714                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1715                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1716         } else if (_substrcmp(*av, "disable") == 0 ||
1717                    _substrcmp(*av, "enable") == 0 ) {
1718                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1719
1720                 av++;
1721                 masks[0] = masks[1] = 0;
1722
1723                 while (av[0]) {
1724                         if (isdigit(**av)) {
1725                                 i = atoi(*av);
1726                                 if (i < 0 || i > RESVD_SET)
1727                                         errx(EX_DATAERR,
1728                                             "invalid set number %d\n", i);
1729                                 masks[which] |= (1<<i);
1730                         } else if (_substrcmp(*av, "disable") == 0)
1731                                 which = 0;
1732                         else if (_substrcmp(*av, "enable") == 0)
1733                                 which = 1;
1734                         else
1735                                 errx(EX_DATAERR,
1736                                         "invalid set command %s\n", *av);
1737                         av++;
1738                 }
1739                 if ( (masks[0] & masks[1]) != 0 )
1740                         errx(EX_DATAERR,
1741                             "cannot enable and disable the same set\n");
1742
1743                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1744                 if (i)
1745                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1746         } else
1747                 errx(EX_USAGE, "invalid set command %s\n", *av);
1748 }
1749
1750 void
1751 ipfw_sysctl_handler(char *av[], int which)
1752 {
1753         av++;
1754
1755         if (av[0] == NULL) {
1756                 warnx("missing keyword to enable/disable\n");
1757         } else if (_substrcmp(*av, "firewall") == 0) {
1758                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1759                     &which, sizeof(which));
1760                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1761                     &which, sizeof(which));
1762         } else if (_substrcmp(*av, "one_pass") == 0) {
1763                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1764                     &which, sizeof(which));
1765         } else if (_substrcmp(*av, "debug") == 0) {
1766                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1767                     &which, sizeof(which));
1768         } else if (_substrcmp(*av, "verbose") == 0) {
1769                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1770                     &which, sizeof(which));
1771         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1772                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1773                     &which, sizeof(which));
1774 #ifndef NO_ALTQ
1775         } else if (_substrcmp(*av, "altq") == 0) {
1776                 altq_set_enabled(which);
1777 #endif
1778         } else {
1779                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1780         }
1781 }
1782
1783 void
1784 ipfw_list(int ac, char *av[], int show_counters)
1785 {
1786         struct ip_fw *r;
1787         ipfw_dyn_rule *dynrules, *d;
1788
1789 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1790         char *lim;
1791         void *data = NULL;
1792         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1793         int exitval = EX_OK;
1794         int lac;
1795         char **lav;
1796         u_long rnum, last;
1797         char *endptr;
1798         int seen = 0;
1799         uint8_t set;
1800
1801         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1802         int nalloc = 1024;      /* start somewhere... */
1803
1804         last = 0;
1805
1806         if (co.test_only) {
1807                 fprintf(stderr, "Testing only, list disabled\n");
1808                 return;
1809         }
1810         if (co.do_pipe) {
1811                 dummynet_list(ac, av, show_counters);
1812                 return;
1813         }
1814
1815         ac--;
1816         av++;
1817
1818         /* get rules or pipes from kernel, resizing array as necessary */
1819         nbytes = nalloc;
1820
1821         while (nbytes >= nalloc) {
1822                 nalloc = nalloc * 2 + 200;
1823                 nbytes = nalloc;
1824                 data = safe_realloc(data, nbytes);
1825                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1826                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1827                                 co.do_pipe ? "DUMMYNET" : "FW");
1828         }
1829
1830         /*
1831          * Count static rules. They have variable size so we
1832          * need to scan the list to count them.
1833          */
1834         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1835                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1836                     ++nstat, r = NEXT(r) )
1837                 ; /* nothing */
1838
1839         /*
1840          * Count dynamic rules. This is easier as they have
1841          * fixed size.
1842          */
1843         r = NEXT(r);
1844         dynrules = (ipfw_dyn_rule *)r ;
1845         n = (char *)r - (char *)data;
1846         ndyn = (nbytes - n) / sizeof *dynrules;
1847
1848         /* if showing stats, figure out column widths ahead of time */
1849         bcwidth = pcwidth = 0;
1850         if (show_counters) {
1851                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1852                         /* skip rules from another set */
1853                         if (co.use_set && r->set != co.use_set - 1)
1854                                 continue;
1855
1856                         /* packet counter */
1857                         width = pr_u64(&r->pcnt, 0);
1858                         if (width > pcwidth)
1859                                 pcwidth = width;
1860
1861                         /* byte counter */
1862                         width = pr_u64(&r->bcnt, 0);
1863                         if (width > bcwidth)
1864                                 bcwidth = width;
1865                 }
1866         }
1867         if (co.do_dynamic && ndyn) {
1868                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1869                         if (co.use_set) {
1870                                 /* skip rules from another set */
1871                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1872                                       &set, sizeof(uint8_t));
1873                                 if (set != co.use_set - 1)
1874                                         continue;
1875                         }
1876                         width = pr_u64(&d->pcnt, 0);
1877                         if (width > pcwidth)
1878                                 pcwidth = width;
1879
1880                         width = pr_u64(&d->bcnt, 0);
1881                         if (width > bcwidth)
1882                                 bcwidth = width;
1883                 }
1884         }
1885         /* if no rule numbers were specified, list all rules */
1886         if (ac == 0) {
1887                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1888                         if (co.use_set && r->set != co.use_set - 1)
1889                                 continue;
1890                         show_ipfw(r, pcwidth, bcwidth);
1891                 }
1892
1893                 if (co.do_dynamic && ndyn) {
1894                         printf("## Dynamic rules (%d):\n", ndyn);
1895                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1896                                 if (co.use_set) {
1897                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1898                                               &set, sizeof(uint8_t));
1899                                         if (set != co.use_set - 1)
1900                                                 continue;
1901                                 }
1902                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1903                 }
1904                 }
1905                 goto done;
1906         }
1907
1908         /* display specific rules requested on command line */
1909
1910         for (lac = ac, lav = av; lac != 0; lac--) {
1911                 /* convert command line rule # */
1912                 last = rnum = strtoul(*lav++, &endptr, 10);
1913                 if (*endptr == '-')
1914                         last = strtoul(endptr+1, &endptr, 10);
1915                 if (*endptr) {
1916                         exitval = EX_USAGE;
1917                         warnx("invalid rule number: %s", *(lav - 1));
1918                         continue;
1919                 }
1920                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1921                         if (r->rulenum > last)
1922                                 break;
1923                         if (co.use_set && r->set != co.use_set - 1)
1924                                 continue;
1925                         if (r->rulenum >= rnum && r->rulenum <= last) {
1926                                 show_ipfw(r, pcwidth, bcwidth);
1927                                 seen = 1;
1928                         }
1929                 }
1930                 if (!seen) {
1931                         /* give precedence to other error(s) */
1932                         if (exitval == EX_OK)
1933                                 exitval = EX_UNAVAILABLE;
1934                         warnx("rule %lu does not exist", rnum);
1935                 }
1936         }
1937
1938         if (co.do_dynamic && ndyn) {
1939                 printf("## Dynamic rules:\n");
1940                 for (lac = ac, lav = av; lac != 0; lac--) {
1941                         last = rnum = strtoul(*lav++, &endptr, 10);
1942                         if (*endptr == '-')
1943                                 last = strtoul(endptr+1, &endptr, 10);
1944                         if (*endptr)
1945                                 /* already warned */
1946                                 continue;
1947                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1948                                 uint16_t rulenum;
1949
1950                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1951                                 if (rulenum > rnum)
1952                                         break;
1953                                 if (co.use_set) {
1954                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1955                                               &set, sizeof(uint8_t));
1956                                         if (set != co.use_set - 1)
1957                                                 continue;
1958                                 }
1959                                 if (r->rulenum >= rnum && r->rulenum <= last)
1960                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1961                         }
1962                 }
1963         }
1964
1965         ac = 0;
1966
1967 done:
1968         free(data);
1969
1970         if (exitval != EX_OK)
1971                 exit(exitval);
1972 #undef NEXT
1973 }
1974
1975 static int
1976 lookup_host (char *host, struct in_addr *ipaddr)
1977 {
1978         struct hostent *he;
1979
1980         if (!inet_aton(host, ipaddr)) {
1981                 if ((he = gethostbyname(host)) == NULL)
1982                         return(-1);
1983                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1984         }
1985         return(0);
1986 }
1987
1988 /*
1989  * fills the addr and mask fields in the instruction as appropriate from av.
1990  * Update length as appropriate.
1991  * The following formats are allowed:
1992  *      me      returns O_IP_*_ME
1993  *      1.2.3.4         single IP address
1994  *      1.2.3.4:5.6.7.8 address:mask
1995  *      1.2.3.4/24      address/mask
1996  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1997  * We can have multiple comma-separated address/mask entries.
1998  */
1999 static void
2000 fill_ip(ipfw_insn_ip *cmd, char *av)
2001 {
2002         int len = 0;
2003         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2004
2005         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2006
2007         if (_substrcmp(av, "any") == 0)
2008                 return;
2009
2010         if (_substrcmp(av, "me") == 0) {
2011                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2012                 return;
2013         }
2014
2015         if (strncmp(av, "table(", 6) == 0) {
2016                 char *p = strchr(av + 6, ',');
2017
2018                 if (p)
2019                         *p++ = '\0';
2020                 cmd->o.opcode = O_IP_DST_LOOKUP;
2021                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2022                 if (p) {
2023                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2024                         d[0] = strtoul(p, NULL, 0);
2025                 } else
2026                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2027                 return;
2028         }
2029
2030     while (av) {
2031         /*
2032          * After the address we can have '/' or ':' indicating a mask,
2033          * ',' indicating another address follows, '{' indicating a
2034          * set of addresses of unspecified size.
2035          */
2036         char *t = NULL, *p = strpbrk(av, "/:,{");
2037         int masklen;
2038         char md, nd = '\0';
2039
2040         if (p) {
2041                 md = *p;
2042                 *p++ = '\0';
2043                 if ((t = strpbrk(p, ",{")) != NULL) {
2044                         nd = *t;
2045                         *t = '\0';
2046                 }
2047         } else
2048                 md = '\0';
2049
2050         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2051                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2052         switch (md) {
2053         case ':':
2054                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2055                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2056                 break;
2057         case '/':
2058                 masklen = atoi(p);
2059                 if (masklen == 0)
2060                         d[1] = htonl(0);        /* mask */
2061                 else if (masklen > 32)
2062                         errx(EX_DATAERR, "bad width ``%s''", p);
2063                 else
2064                         d[1] = htonl(~0 << (32 - masklen));
2065                 break;
2066         case '{':       /* no mask, assume /24 and put back the '{' */
2067                 d[1] = htonl(~0 << (32 - 24));
2068                 *(--p) = md;
2069                 break;
2070
2071         case ',':       /* single address plus continuation */
2072                 *(--p) = md;
2073                 /* FALLTHROUGH */
2074         case 0:         /* initialization value */
2075         default:
2076                 d[1] = htonl(~0);       /* force /32 */
2077                 break;
2078         }
2079         d[0] &= d[1];           /* mask base address with mask */
2080         if (t)
2081                 *t = nd;
2082         /* find next separator */
2083         if (p)
2084                 p = strpbrk(p, ",{");
2085         if (p && *p == '{') {
2086                 /*
2087                  * We have a set of addresses. They are stored as follows:
2088                  *   arg1       is the set size (powers of 2, 2..256)
2089                  *   addr       is the base address IN HOST FORMAT
2090                  *   mask..     is an array of arg1 bits (rounded up to
2091                  *              the next multiple of 32) with bits set
2092                  *              for each host in the map.
2093                  */
2094                 uint32_t *map = (uint32_t *)&cmd->mask;
2095                 int low, high;
2096                 int i = contigmask((uint8_t *)&(d[1]), 32);
2097
2098                 if (len > 0)
2099                         errx(EX_DATAERR, "address set cannot be in a list");
2100                 if (i < 24 || i > 31)
2101                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2102                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2103                 d[0] = ntohl(d[0]);             /* base addr in host format */
2104                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2105                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2106                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2107                         map[i] = 0;     /* clear map */
2108
2109                 av = p + 1;
2110                 low = d[0] & 0xff;
2111                 high = low + cmd->o.arg1 - 1;
2112                 /*
2113                  * Here, i stores the previous value when we specify a range
2114                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2115                  * have no previous value.
2116                  */
2117                 i = -1; /* previous value in a range */
2118                 while (isdigit(*av)) {
2119                         char *s;
2120                         int a = strtol(av, &s, 0);
2121
2122                         if (s == av) { /* no parameter */
2123                             if (*av != '}')
2124                                 errx(EX_DATAERR, "set not closed\n");
2125                             if (i != -1)
2126                                 errx(EX_DATAERR, "incomplete range %d-", i);
2127                             break;
2128                         }
2129                         if (a < low || a > high)
2130                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2131                                 a, low, high);
2132                         a -= low;
2133                         if (i == -1)    /* no previous in range */
2134                             i = a;
2135                         else {          /* check that range is valid */
2136                             if (i > a)
2137                                 errx(EX_DATAERR, "invalid range %d-%d",
2138                                         i+low, a+low);
2139                             if (*s == '-')
2140                                 errx(EX_DATAERR, "double '-' in range");
2141                         }
2142                         for (; i <= a; i++)
2143                             map[i/32] |= 1<<(i & 31);
2144                         i = -1;
2145                         if (*s == '-')
2146                             i = a;
2147                         else if (*s == '}')
2148                             break;
2149                         av = s+1;
2150                 }
2151                 return;
2152         }
2153         av = p;
2154         if (av)                 /* then *av must be a ',' */
2155                 av++;
2156
2157         /* Check this entry */
2158         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2159                 /*
2160                  * 'any' turns the entire list into a NOP.
2161                  * 'not any' never matches, so it is removed from the
2162                  * list unless it is the only item, in which case we
2163                  * report an error.
2164                  */
2165                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2166                         if (av == NULL && len == 0) /* only this entry */
2167                                 errx(EX_DATAERR, "not any never matches");
2168                 }
2169                 /* else do nothing and skip this entry */
2170                 return;
2171         }
2172         /* A single IP can be stored in an optimized format */
2173         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2174                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2175                 return;
2176         }
2177         len += 2;       /* two words... */
2178         d += 2;
2179     } /* end while */
2180     if (len + 1 > F_LEN_MASK)
2181         errx(EX_DATAERR, "address list too long");
2182     cmd->o.len |= len+1;
2183 }
2184
2185
2186 /* n2mask sets n bits of the mask */
2187 void
2188 n2mask(struct in6_addr *mask, int n)
2189 {
2190         static int      minimask[9] =
2191             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2192         u_char          *p;
2193
2194         memset(mask, 0, sizeof(struct in6_addr));
2195         p = (u_char *) mask;
2196         for (; n > 0; p++, n -= 8) {
2197                 if (n >= 8)
2198                         *p = 0xff;
2199                 else
2200                         *p = minimask[n];
2201         }
2202         return;
2203 }
2204
2205
2206 /*
2207  * helper function to process a set of flags and set bits in the
2208  * appropriate masks.
2209  */
2210 static void
2211 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2212         struct _s_x *flags, char *p)
2213 {
2214         uint8_t set=0, clear=0;
2215
2216         while (p && *p) {
2217                 char *q;        /* points to the separator */
2218                 int val;
2219                 uint8_t *which; /* mask we are working on */
2220
2221                 if (*p == '!') {
2222                         p++;
2223                         which = &clear;
2224                 } else
2225                         which = &set;
2226                 q = strchr(p, ',');
2227                 if (q)
2228                         *q++ = '\0';
2229                 val = match_token(flags, p);
2230                 if (val <= 0)
2231                         errx(EX_DATAERR, "invalid flag %s", p);
2232                 *which |= (uint8_t)val;
2233                 p = q;
2234         }
2235         cmd->opcode = opcode;
2236         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2237         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2238 }
2239
2240
2241 void
2242 ipfw_delete(char *av[])
2243 {
2244         uint32_t rulenum;
2245         int i;
2246         int exitval = EX_OK;
2247         int do_set = 0;
2248
2249         av++;
2250         NEED1("missing rule specification");
2251         if ( *av && _substrcmp(*av, "set") == 0) {
2252                 /* Do not allow using the following syntax:
2253                  *      ipfw set N delete set M
2254                  */
2255                 if (co.use_set)
2256                         errx(EX_DATAERR, "invalid syntax");
2257                 do_set = 1;     /* delete set */
2258                 av++;
2259         }
2260
2261         /* Rule number */
2262         while (*av && isdigit(**av)) {
2263                 i = atoi(*av); av++;
2264                 if (co.do_nat) {
2265                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2266                         if (exitval) {
2267                                 exitval = EX_UNAVAILABLE;
2268                                 warn("rule %u not available", i);
2269                         }
2270                 } else if (co.do_pipe) {
2271                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2272                 } else {
2273                         if (co.use_set)
2274                                 rulenum = (i & 0xffff) | (5 << 24) |
2275                                     ((co.use_set - 1) << 16);
2276                         else
2277                         rulenum =  (i & 0xffff) | (do_set << 24);
2278                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2279                         if (i) {
2280                                 exitval = EX_UNAVAILABLE;
2281                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2282                                     rulenum);
2283                         }
2284                 }
2285         }
2286         if (exitval != EX_OK)
2287                 exit(exitval);
2288 }
2289
2290
2291 /*
2292  * fill the interface structure. We do not check the name as we can
2293  * create interfaces dynamically, so checking them at insert time
2294  * makes relatively little sense.
2295  * Interface names containing '*', '?', or '[' are assumed to be shell
2296  * patterns which match interfaces.
2297  */
2298 static void
2299 fill_iface(ipfw_insn_if *cmd, char *arg)
2300 {
2301         cmd->name[0] = '\0';
2302         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2303
2304         /* Parse the interface or address */
2305         if (strcmp(arg, "any") == 0)
2306                 cmd->o.len = 0;         /* effectively ignore this command */
2307         else if (!isdigit(*arg)) {
2308                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2309                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2310         } else if (!inet_aton(arg, &cmd->p.ip))
2311                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2312 }
2313
2314 static void
2315 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2316 {
2317         int i;
2318         size_t l;
2319         char *ap, *ptr, *optr;
2320         struct ether_addr *mac;
2321         const char *macset = "0123456789abcdefABCDEF:";
2322
2323         if (strcmp(p, "any") == 0) {
2324                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2325                         addr[i] = mask[i] = 0;
2326                 return;
2327         }
2328
2329         optr = ptr = strdup(p);
2330         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2331                 l = strlen(ap);
2332                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2333                         errx(EX_DATAERR, "Incorrect MAC address");
2334                 bcopy(mac, addr, ETHER_ADDR_LEN);
2335         } else
2336                 errx(EX_DATAERR, "Incorrect MAC address");
2337
2338         if (ptr != NULL) { /* we have mask? */
2339                 if (p[ptr - optr - 1] == '/') { /* mask len */
2340                         long ml = strtol(ptr, &ap, 10);
2341                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2342                                 errx(EX_DATAERR, "Incorrect mask length");
2343                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2344                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2345                 } else { /* mask */
2346                         l = strlen(ptr);
2347                         if (strspn(ptr, macset) != l ||
2348                             (mac = ether_aton(ptr)) == NULL)
2349                                 errx(EX_DATAERR, "Incorrect mask");
2350                         bcopy(mac, mask, ETHER_ADDR_LEN);
2351                 }
2352         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2353                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2354                         mask[i] = 0xff;
2355         }
2356         for (i = 0; i < ETHER_ADDR_LEN; i++)
2357                 addr[i] &= mask[i];
2358
2359         free(optr);
2360 }
2361
2362 /*
2363  * helper function, updates the pointer to cmd with the length
2364  * of the current command, and also cleans up the first word of
2365  * the new command in case it has been clobbered before.
2366  */
2367 static ipfw_insn *
2368 next_cmd(ipfw_insn *cmd)
2369 {
2370         cmd += F_LEN(cmd);
2371         bzero(cmd, sizeof(*cmd));
2372         return cmd;
2373 }
2374
2375 /*
2376  * Takes arguments and copies them into a comment
2377  */
2378 static void
2379 fill_comment(ipfw_insn *cmd, char **av)
2380 {
2381         int i, l;
2382         char *p = (char *)(cmd + 1);
2383
2384         cmd->opcode = O_NOP;
2385         cmd->len =  (cmd->len & (F_NOT | F_OR));
2386
2387         /* Compute length of comment string. */
2388         for (i = 0, l = 0; av[i] != NULL; i++)
2389                 l += strlen(av[i]) + 1;
2390         if (l == 0)
2391                 return;
2392         if (l > 84)
2393                 errx(EX_DATAERR,
2394                     "comment too long (max 80 chars)");
2395         l = 1 + (l+3)/4;
2396         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2397         for (i = 0; av[i] != NULL; i++) {
2398                 strcpy(p, av[i]);
2399                 p += strlen(av[i]);
2400                 *p++ = ' ';
2401         }
2402         *(--p) = '\0';
2403 }
2404
2405 /*
2406  * A function to fill simple commands of size 1.
2407  * Existing flags are preserved.
2408  */
2409 static void
2410 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2411 {
2412         cmd->opcode = opcode;
2413         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2414         cmd->arg1 = arg;
2415 }
2416
2417 /*
2418  * Fetch and add the MAC address and type, with masks. This generates one or
2419  * two microinstructions, and returns the pointer to the last one.
2420  */
2421 static ipfw_insn *
2422 add_mac(ipfw_insn *cmd, char *av[])
2423 {
2424         ipfw_insn_mac *mac;
2425
2426         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2427                 errx(EX_DATAERR, "MAC dst src");
2428
2429         cmd->opcode = O_MACADDR2;
2430         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2431
2432         mac = (ipfw_insn_mac *)cmd;
2433         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2434         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2435             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2436         return cmd;
2437 }
2438
2439 static ipfw_insn *
2440 add_mactype(ipfw_insn *cmd, char *av)
2441 {
2442         if (!av)
2443                 errx(EX_DATAERR, "missing MAC type");
2444         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2445                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2446                 cmd->opcode = O_MAC_TYPE;
2447                 return cmd;
2448         } else
2449                 return NULL;
2450 }
2451
2452 static ipfw_insn *
2453 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2454 {
2455         struct protoent *pe;
2456         char *ep;
2457         int proto;
2458
2459         proto = strtol(av, &ep, 10);
2460         if (*ep != '\0' || proto <= 0) {
2461                 if ((pe = getprotobyname(av)) == NULL)
2462                         return NULL;
2463                 proto = pe->p_proto;
2464         }
2465
2466         fill_cmd(cmd, O_PROTO, 0, proto);
2467         *protop = proto;
2468         return cmd;
2469 }
2470
2471 static ipfw_insn *
2472 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2473 {
2474         u_char proto = IPPROTO_IP;
2475
2476         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2477                 ; /* do not set O_IP4 nor O_IP6 */
2478         else if (strcmp(av, "ip4") == 0)
2479                 /* explicit "just IPv4" rule */
2480                 fill_cmd(cmd, O_IP4, 0, 0);
2481         else if (strcmp(av, "ip6") == 0) {
2482                 /* explicit "just IPv6" rule */
2483                 proto = IPPROTO_IPV6;
2484                 fill_cmd(cmd, O_IP6, 0, 0);
2485         } else
2486                 return add_proto0(cmd, av, protop);
2487
2488         *protop = proto;
2489         return cmd;
2490 }
2491
2492 static ipfw_insn *
2493 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2494 {
2495         u_char proto = IPPROTO_IP;
2496
2497         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2498                 ; /* do not set O_IP4 nor O_IP6 */
2499         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2500                 /* explicit "just IPv4" rule */
2501                 fill_cmd(cmd, O_IP4, 0, 0);
2502         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2503                 /* explicit "just IPv6" rule */
2504                 proto = IPPROTO_IPV6;
2505                 fill_cmd(cmd, O_IP6, 0, 0);
2506         } else
2507                 return add_proto0(cmd, av, protop);
2508
2509         *protop = proto;
2510         return cmd;
2511 }
2512
2513 static ipfw_insn *
2514 add_srcip(ipfw_insn *cmd, char *av)
2515 {
2516         fill_ip((ipfw_insn_ip *)cmd, av);
2517         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2518                 cmd->opcode = O_IP_SRC_SET;
2519         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2520                 cmd->opcode = O_IP_SRC_LOOKUP;
2521         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2522                 cmd->opcode = O_IP_SRC_ME;
2523         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2524                 cmd->opcode = O_IP_SRC;
2525         else                                                    /* addr/mask */
2526                 cmd->opcode = O_IP_SRC_MASK;
2527         return cmd;
2528 }
2529
2530 static ipfw_insn *
2531 add_dstip(ipfw_insn *cmd, char *av)
2532 {
2533         fill_ip((ipfw_insn_ip *)cmd, av);
2534         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2535                 ;
2536         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2537                 ;
2538         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2539                 cmd->opcode = O_IP_DST_ME;
2540         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2541                 cmd->opcode = O_IP_DST;
2542         else                                                    /* addr/mask */
2543                 cmd->opcode = O_IP_DST_MASK;
2544         return cmd;
2545 }
2546
2547 static ipfw_insn *
2548 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2549 {
2550         /* XXX "any" is trapped before. Perhaps "to" */
2551         if (_substrcmp(av, "any") == 0) {
2552                 return NULL;
2553         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2554                 /* XXX todo: check that we have a protocol with ports */
2555                 cmd->opcode = opcode;
2556                 return cmd;
2557         }
2558         return NULL;
2559 }
2560
2561 static ipfw_insn *
2562 add_src(ipfw_insn *cmd, char *av, u_char proto)
2563 {
2564         struct in6_addr a;
2565         char *host, *ch;
2566         ipfw_insn *ret = NULL;
2567
2568         if ((host = strdup(av)) == NULL)
2569                 return NULL;
2570         if ((ch = strrchr(host, '/')) != NULL)
2571                 *ch = '\0';
2572
2573         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2574             inet_pton(AF_INET6, host, &a) == 1)
2575                 ret = add_srcip6(cmd, av);
2576         /* XXX: should check for IPv4, not !IPv6 */
2577         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2578             inet_pton(AF_INET6, host, &a) != 1))
2579                 ret = add_srcip(cmd, av);
2580         if (ret == NULL && strcmp(av, "any") != 0)
2581                 ret = cmd;
2582
2583         free(host);
2584         return ret;
2585 }
2586
2587 static ipfw_insn *
2588 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2589 {
2590         struct in6_addr a;
2591         char *host, *ch;
2592         ipfw_insn *ret = NULL;
2593
2594         if ((host = strdup(av)) == NULL)
2595                 return NULL;
2596         if ((ch = strrchr(host, '/')) != NULL)
2597                 *ch = '\0';
2598
2599         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2600             inet_pton(AF_INET6, host, &a) == 1)
2601                 ret = add_dstip6(cmd, av);
2602         /* XXX: should check for IPv4, not !IPv6 */
2603         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2604             inet_pton(AF_INET6, host, &a) != 1))
2605                 ret = add_dstip(cmd, av);
2606         if (ret == NULL && strcmp(av, "any") != 0)
2607                 ret = cmd;
2608
2609         free(host);
2610         return ret;
2611 }
2612
2613 /*
2614  * Parse arguments and assemble the microinstructions which make up a rule.
2615  * Rules are added into the 'rulebuf' and then copied in the correct order
2616  * into the actual rule.
2617  *
2618  * The syntax for a rule starts with the action, followed by
2619  * optional action parameters, and the various match patterns.
2620  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2621  * (generated if the rule includes a keep-state option), then the
2622  * various match patterns, log/altq actions, and the actual action.
2623  *
2624  */
2625 void
2626 ipfw_add(char *av[])
2627 {
2628         /*
2629          * rules are added into the 'rulebuf' and then copied in
2630          * the correct order into the actual rule.
2631          * Some things that need to go out of order (prob, action etc.)
2632          * go into actbuf[].
2633          */
2634         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2635
2636         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2637         ipfw_insn *first_cmd;   /* first match pattern */
2638
2639         struct ip_fw *rule;
2640
2641         /*
2642          * various flags used to record that we entered some fields.
2643          */
2644         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2645         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2646         size_t len;
2647
2648         int i;
2649
2650         int open_par = 0;       /* open parenthesis ( */
2651
2652         /* proto is here because it is used to fetch ports */
2653         u_char proto = IPPROTO_IP;      /* default protocol */
2654
2655         double match_prob = 1; /* match probability, default is always match */
2656
2657         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2658         bzero(cmdbuf, sizeof(cmdbuf));
2659         bzero(rulebuf, sizeof(rulebuf));
2660
2661         rule = (struct ip_fw *)rulebuf;
2662         cmd = (ipfw_insn *)cmdbuf;
2663         action = (ipfw_insn *)actbuf;
2664
2665         av++;
2666
2667         /* [rule N]     -- Rule number optional */
2668         if (av[0] && isdigit(**av)) {
2669                 rule->rulenum = atoi(*av);
2670                 av++;
2671         }
2672
2673         /* [set N]      -- set number (0..RESVD_SET), optional */
2674         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2675                 int set = strtoul(av[1], NULL, 10);
2676                 if (set < 0 || set > RESVD_SET)
2677                         errx(EX_DATAERR, "illegal set %s", av[1]);
2678                 rule->set = set;
2679                 av += 2;
2680         }
2681
2682         /* [prob D]     -- match probability, optional */
2683         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2684                 match_prob = strtod(av[1], NULL);
2685
2686                 if (match_prob <= 0 || match_prob > 1)
2687                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2688                 av += 2;
2689         }
2690
2691         /* action       -- mandatory */
2692         NEED1("missing action");
2693         i = match_token(rule_actions, *av);
2694         av++;
2695         action->len = 1;        /* default */
2696         switch(i) {
2697         case TOK_CHECKSTATE:
2698                 have_state = action;
2699                 action->opcode = O_CHECK_STATE;
2700                 break;
2701
2702         case TOK_ACCEPT:
2703                 action->opcode = O_ACCEPT;
2704                 break;
2705
2706         case TOK_DENY:
2707                 action->opcode = O_DENY;
2708                 action->arg1 = 0;
2709                 break;
2710
2711         case TOK_REJECT:
2712                 action->opcode = O_REJECT;
2713                 action->arg1 = ICMP_UNREACH_HOST;
2714                 break;
2715
2716         case TOK_RESET:
2717                 action->opcode = O_REJECT;
2718                 action->arg1 = ICMP_REJECT_RST;
2719                 break;
2720
2721         case TOK_RESET6:
2722                 action->opcode = O_UNREACH6;
2723                 action->arg1 = ICMP6_UNREACH_RST;
2724                 break;
2725
2726         case TOK_UNREACH:
2727                 action->opcode = O_REJECT;
2728                 NEED1("missing reject code");
2729                 fill_reject_code(&action->arg1, *av);
2730                 av++;
2731                 break;
2732
2733         case TOK_UNREACH6:
2734                 action->opcode = O_UNREACH6;
2735                 NEED1("missing unreach code");
2736                 fill_unreach6_code(&action->arg1, *av);
2737                 av++;
2738                 break;
2739
2740         case TOK_COUNT:
2741                 action->opcode = O_COUNT;
2742                 break;
2743
2744         case TOK_NAT:
2745                 action->opcode = O_NAT;
2746                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2747                 goto chkarg;
2748
2749         case TOK_QUEUE:
2750                 action->opcode = O_QUEUE;
2751                 goto chkarg;
2752         case TOK_PIPE:
2753                 action->opcode = O_PIPE;
2754                 goto chkarg;
2755         case TOK_SKIPTO:
2756                 action->opcode = O_SKIPTO;
2757                 goto chkarg;
2758         case TOK_NETGRAPH:
2759                 action->opcode = O_NETGRAPH;
2760                 goto chkarg;
2761         case TOK_NGTEE:
2762                 action->opcode = O_NGTEE;
2763                 goto chkarg;
2764         case TOK_DIVERT:
2765                 action->opcode = O_DIVERT;
2766                 goto chkarg;
2767         case TOK_TEE:
2768                 action->opcode = O_TEE;
2769 chkarg:
2770                 if (!av[0])
2771                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2772                 if (isdigit(**av)) {
2773                         action->arg1 = strtoul(*av, NULL, 10);
2774                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2775                                 errx(EX_DATAERR, "illegal argument for %s",
2776                                     *(av - 1));
2777                 } else if (_substrcmp(*av, "tablearg") == 0) {
2778                         action->arg1 = IP_FW_TABLEARG;
2779                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2780                         struct servent *s;
2781                         setservent(1);
2782                         s = getservbyname(av[0], "divert");
2783                         if (s != NULL)
2784                                 action->arg1 = ntohs(s->s_port);
2785                         else
2786                                 errx(EX_DATAERR, "illegal divert/tee port");
2787                 } else
2788                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2789                 av++;
2790                 break;
2791
2792         case TOK_FORWARD: {
2793                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2794                 char *s, *end;
2795
2796                 NEED1("missing forward address[:port]");
2797
2798                 action->opcode = O_FORWARD_IP;
2799                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2800
2801                 /*
2802                  * In the kernel we assume AF_INET and use only
2803                  * sin_port and sin_addr. Remember to set sin_len as
2804                  * the routing code seems to use it too.
2805                  */
2806                 p->sa.sin_family = AF_INET;
2807                 p->sa.sin_len = sizeof(struct sockaddr_in);
2808                 p->sa.sin_port = 0;
2809                 /*
2810                  * locate the address-port separator (':' or ',')
2811                  */
2812                 s = strchr(*av, ':');
2813                 if (s == NULL)
2814                         s = strchr(*av, ',');
2815                 if (s != NULL) {
2816                         *(s++) = '\0';
2817                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2818                         if (s == end)
2819                                 errx(EX_DATAERR,
2820                                     "illegal forwarding port ``%s''", s);
2821                         p->sa.sin_port = (u_short)i;
2822                 }
2823                 if (_substrcmp(*av, "tablearg") == 0)
2824                         p->sa.sin_addr.s_addr = INADDR_ANY;
2825                 else
2826                         lookup_host(*av, &(p->sa.sin_addr));
2827                 av++;
2828                 break;
2829             }
2830         case TOK_COMMENT:
2831                 /* pretend it is a 'count' rule followed by the comment */
2832                 action->opcode = O_COUNT;
2833                 av--;           /* go back... */
2834                 break;
2835
2836         case TOK_SETFIB:
2837             {
2838                 int numfibs;
2839                 size_t intsize = sizeof(int);
2840
2841                 action->opcode = O_SETFIB;
2842                 NEED1("missing fib number");
2843                 action->arg1 = strtoul(*av, NULL, 10);
2844                 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
2845                         errx(EX_DATAERR, "fibs not suported.\n");
2846                 if (action->arg1 >= numfibs)  /* Temporary */
2847                         errx(EX_DATAERR, "fib too large.\n");
2848                 av++;
2849                 break;
2850             }
2851
2852         case TOK_REASS:
2853                 action->opcode = O_REASS;
2854                 break;
2855
2856         default:
2857                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2858         }
2859         action = next_cmd(action);
2860
2861         /*
2862          * [altq queuename] -- altq tag, optional
2863          * [log [logamount N]]  -- log, optional
2864          *
2865          * If they exist, it go first in the cmdbuf, but then it is
2866          * skipped in the copy section to the end of the buffer.
2867          */
2868         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
2869                 av++;
2870                 switch (i) {
2871                 case TOK_LOG:
2872                     {
2873                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2874                         int l;
2875
2876                         if (have_log)
2877                                 errx(EX_DATAERR,
2878                                     "log cannot be specified more than once");
2879                         have_log = (ipfw_insn *)c;
2880                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2881                         cmd->opcode = O_LOG;
2882                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
2883                                 av++;
2884                                 NEED1("logamount requires argument");
2885                                 l = atoi(*av);
2886                                 if (l < 0)
2887                                         errx(EX_DATAERR,
2888                                             "logamount must be positive");
2889                                 c->max_log = l;
2890                                 av++;
2891                         } else {
2892                                 len = sizeof(c->max_log);
2893                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2894                                     &c->max_log, &len, NULL, 0) == -1)
2895                                         errx(1, "sysctlbyname(\"%s\")",
2896                                             "net.inet.ip.fw.verbose_limit");
2897                         }
2898                     }
2899                         break;
2900
2901 #ifndef NO_ALTQ
2902                 case TOK_ALTQ:
2903                     {
2904                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
2905
2906                         NEED1("missing altq queue name");
2907                         if (have_altq)
2908                                 errx(EX_DATAERR,
2909                                     "altq cannot be specified more than once");
2910                         have_altq = (ipfw_insn *)a;
2911                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
2912                         cmd->opcode = O_ALTQ;
2913                         a->qid = altq_name_to_qid(*av);
2914                         av++;
2915                     }
2916                         break;
2917 #endif
2918
2919                 case TOK_TAG:
2920                 case TOK_UNTAG: {
2921                         uint16_t tag;
2922
2923                         if (have_tag)
2924                                 errx(EX_USAGE, "tag and untag cannot be "
2925                                     "specified more than once");
2926                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
2927                            rule_action_params);
2928                         have_tag = cmd;
2929                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
2930                         av++;
2931                         break;
2932                 }
2933
2934                 default:
2935                         abort();
2936                 }
2937                 cmd = next_cmd(cmd);
2938         }
2939
2940         if (have_state) /* must be a check-state, we are done */
2941                 goto done;
2942
2943 #define OR_START(target)                                        \
2944         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
2945                 if (open_par)                                   \
2946                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2947                 prev = NULL;                                    \
2948                 open_par = 1;                                   \
2949                 if ( (av[0])[1] == '\0') {                      \
2950                         av++;                                   \
2951                 } else                                          \
2952                         (*av)++;                                \
2953         }                                                       \
2954         target:                                                 \
2955
2956
2957 #define CLOSE_PAR                                               \
2958         if (open_par) {                                         \
2959                 if (av[0] && (                                  \
2960                     strcmp(*av, ")") == 0 ||                    \
2961                     strcmp(*av, "}") == 0)) {                   \
2962                         prev = NULL;                            \
2963                         open_par = 0;                           \
2964                         av++;                                   \
2965                 } else                                          \
2966                         errx(EX_USAGE, "missing \")\"\n");      \
2967         }
2968
2969 #define NOT_BLOCK                                               \
2970         if (av[0] && _substrcmp(*av, "not") == 0) {             \
2971                 if (cmd->len & F_NOT)                           \
2972                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2973                 cmd->len |= F_NOT;                              \
2974                 av++;                                           \
2975         }
2976
2977 #define OR_BLOCK(target)                                        \
2978         if (av[0] && _substrcmp(*av, "or") == 0) {              \
2979                 if (prev == NULL || open_par == 0)              \
2980                         errx(EX_DATAERR, "invalid OR block");   \
2981                 prev->len |= F_OR;                              \
2982                 av++;                                   \
2983                 goto target;                                    \
2984         }                                                       \
2985         CLOSE_PAR;
2986
2987         first_cmd = cmd;
2988
2989 #if 0
2990         /*
2991          * MAC addresses, optional.
2992          * If we have this, we skip the part "proto from src to dst"
2993          * and jump straight to the option parsing.
2994          */
2995         NOT_BLOCK;
2996         NEED1("missing protocol");
2997         if (_substrcmp(*av, "MAC") == 0 ||
2998             _substrcmp(*av, "mac") == 0) {
2999                 av++;                   /* the "MAC" keyword */
3000                 add_mac(cmd, av);       /* exits in case of errors */
3001                 cmd = next_cmd(cmd);
3002                 av += 2;                /* dst-mac and src-mac */
3003                 NOT_BLOCK;
3004                 NEED1("missing mac type");
3005                 if (add_mactype(cmd, av[0]))
3006                         cmd = next_cmd(cmd);
3007                 av++;                   /* any or mac-type */
3008                 goto read_options;
3009         }
3010 #endif
3011
3012         /*
3013          * protocol, mandatory
3014          */
3015     OR_START(get_proto);
3016         NOT_BLOCK;
3017         NEED1("missing protocol");
3018         if (add_proto_compat(cmd, *av, &proto)) {
3019                 av++;
3020                 if (F_LEN(cmd) != 0) {
3021                         prev = cmd;
3022                         cmd = next_cmd(cmd);
3023                 }
3024         } else if (first_cmd != cmd) {
3025                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3026         } else
3027                 goto read_options;
3028     OR_BLOCK(get_proto);
3029
3030         /*
3031          * "from", mandatory
3032          */
3033         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3034                 errx(EX_USAGE, "missing ``from''");
3035         av++;
3036
3037         /*
3038          * source IP, mandatory
3039          */
3040     OR_START(source_ip);
3041         NOT_BLOCK;      /* optional "not" */
3042         NEED1("missing source address");
3043         if (add_src(cmd, *av, proto)) {
3044                 av++;
3045                 if (F_LEN(cmd) != 0) {  /* ! any */
3046                         prev = cmd;
3047                         cmd = next_cmd(cmd);
3048                 }
3049         } else
3050                 errx(EX_USAGE, "bad source address %s", *av);
3051     OR_BLOCK(source_ip);
3052
3053         /*
3054          * source ports, optional
3055          */
3056         NOT_BLOCK;      /* optional "not" */
3057         if ( av[0] != NULL ) {
3058                 if (_substrcmp(*av, "any") == 0 ||
3059                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3060                         av++;
3061                         if (F_LEN(cmd) != 0)
3062                                 cmd = next_cmd(cmd);
3063                 }
3064         }
3065
3066         /*
3067          * "to", mandatory
3068          */
3069         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3070                 errx(EX_USAGE, "missing ``to''");
3071         av++;
3072
3073         /*
3074          * destination, mandatory
3075          */
3076     OR_START(dest_ip);
3077         NOT_BLOCK;      /* optional "not" */
3078         NEED1("missing dst address");
3079         if (add_dst(cmd, *av, proto)) {
3080                 av++;
3081                 if (F_LEN(cmd) != 0) {  /* ! any */
3082                         prev = cmd;
3083                         cmd = next_cmd(cmd);
3084                 }
3085         } else
3086                 errx( EX_USAGE, "bad destination address %s", *av);
3087     OR_BLOCK(dest_ip);
3088
3089         /*
3090          * dest. ports, optional
3091          */
3092         NOT_BLOCK;      /* optional "not" */
3093         if (av[0]) {
3094                 if (_substrcmp(*av, "any") == 0 ||
3095                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3096                         av++;
3097                         if (F_LEN(cmd) != 0)
3098                                 cmd = next_cmd(cmd);
3099                 }
3100         }
3101
3102 read_options:
3103         if (av[0] && first_cmd == cmd) {
3104                 /*
3105                  * nothing specified so far, store in the rule to ease
3106                  * printout later.
3107                  */
3108                  rule->_pad = 1;
3109         }
3110         prev = NULL;
3111         while ( av[0] != NULL ) {
3112                 char *s;
3113                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3114
3115                 s = *av;
3116                 cmd32 = (ipfw_insn_u32 *)cmd;
3117
3118                 if (*s == '!') {        /* alternate syntax for NOT */
3119                         if (cmd->len & F_NOT)
3120                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3121                         cmd->len = F_NOT;
3122                         s++;
3123                 }
3124                 i = match_token(rule_options, s);
3125                 av++;
3126                 switch(i) {
3127                 case TOK_NOT:
3128                         if (cmd->len & F_NOT)
3129                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3130                         cmd->len = F_NOT;
3131                         break;
3132
3133                 case TOK_OR:
3134                         if (open_par == 0 || prev == NULL)
3135                                 errx(EX_USAGE, "invalid \"or\" block\n");
3136                         prev->len |= F_OR;
3137                         break;
3138
3139                 case TOK_STARTBRACE:
3140                         if (open_par)
3141                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3142                         open_par = 1;
3143                         break;
3144
3145                 case TOK_ENDBRACE:
3146                         if (!open_par)
3147                                 errx(EX_USAGE, "+missing \")\"\n");
3148                         open_par = 0;
3149                         prev = NULL;
3150                         break;
3151
3152                 case TOK_IN:
3153                         fill_cmd(cmd, O_IN, 0, 0);
3154                         break;
3155
3156                 case TOK_OUT:
3157                         cmd->len ^= F_NOT; /* toggle F_NOT */
3158                         fill_cmd(cmd, O_IN, 0, 0);
3159                         break;
3160
3161                 case TOK_DIVERTED:
3162                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3163                         break;
3164
3165                 case TOK_DIVERTEDLOOPBACK:
3166                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3167                         break;
3168
3169                 case TOK_DIVERTEDOUTPUT:
3170                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3171                         break;
3172
3173                 case TOK_FRAG:
3174                         fill_cmd(cmd, O_FRAG, 0, 0);
3175                         break;
3176
3177                 case TOK_LAYER2:
3178                         fill_cmd(cmd, O_LAYER2, 0, 0);
3179                         break;
3180
3181                 case TOK_XMIT:
3182                 case TOK_RECV:
3183                 case TOK_VIA:
3184                         NEED1("recv, xmit, via require interface name"
3185                                 " or address");
3186                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3187                         av++;
3188                         if (F_LEN(cmd) == 0)    /* not a valid address */
3189                                 break;
3190                         if (i == TOK_XMIT)
3191                                 cmd->opcode = O_XMIT;
3192                         else if (i == TOK_RECV)
3193                                 cmd->opcode = O_RECV;
3194                         else if (i == TOK_VIA)
3195                                 cmd->opcode = O_VIA;
3196                         break;
3197
3198                 case TOK_ICMPTYPES:
3199                         NEED1("icmptypes requires list of types");
3200                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3201                         av++;
3202                         break;
3203
3204                 case TOK_ICMP6TYPES:
3205                         NEED1("icmptypes requires list of types");
3206                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3207                         av++;
3208                         break;
3209
3210                 case TOK_IPTTL:
3211                         NEED1("ipttl requires TTL");
3212                         if (strpbrk(*av, "-,")) {
3213                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3214                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3215                         } else
3216                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3217                         av++;
3218                         break;
3219
3220                 case TOK_IPID:
3221                         NEED1("ipid requires id");
3222                         if (strpbrk(*av, "-,")) {
3223                             if (!add_ports(cmd, *av, 0, O_IPID))
3224                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3225                         } else
3226                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3227                         av++;
3228                         break;
3229
3230                 case TOK_IPLEN:
3231                         NEED1("iplen requires length");
3232                         if (strpbrk(*av, "-,")) {
3233                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3234                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3235                         } else
3236                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3237                         av++;
3238                         break;
3239
3240                 case TOK_IPVER:
3241                         NEED1("ipver requires version");
3242                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3243                         av++;
3244                         break;
3245
3246                 case TOK_IPPRECEDENCE:
3247                         NEED1("ipprecedence requires value");
3248                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3249                             (strtoul(*av, NULL, 0) & 7) << 5);
3250                         av++;
3251                         break;
3252
3253                 case TOK_IPOPTS:
3254                         NEED1("missing argument for ipoptions");
3255                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3256                         av++;
3257                         break;
3258
3259                 case TOK_IPTOS:
3260                         NEED1("missing argument for iptos");
3261                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3262                         av++;
3263                         break;
3264
3265                 case TOK_UID:
3266                         NEED1("uid requires argument");
3267                     {
3268                         char *end;
3269                         uid_t uid;
3270                         struct passwd *pwd;
3271
3272                         cmd->opcode = O_UID;
3273                         uid = strtoul(*av, &end, 0);
3274                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3275                         if (pwd == NULL)
3276                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3277                         cmd32->d[0] = pwd->pw_uid;
3278                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3279                         av++;
3280                     }
3281                         break;
3282
3283                 case TOK_GID:
3284                         NEED1("gid requires argument");
3285                     {
3286                         char *end;
3287                         gid_t gid;
3288                         struct group *grp;
3289
3290                         cmd->opcode = O_GID;
3291                         gid = strtoul(*av, &end, 0);
3292                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3293                         if (grp == NULL)
3294                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3295                         cmd32->d[0] = grp->gr_gid;
3296                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3297                         av++;
3298                     }
3299                         break;
3300
3301                 case TOK_JAIL:
3302                         NEED1("jail requires argument");
3303                     {
3304                         char *end;
3305                         int jid;
3306
3307                         cmd->opcode = O_JAIL;
3308                         jid = (int)strtol(*av, &end, 0);
3309                         if (jid < 0 || *end != '\0')
3310                                 errx(EX_DATAERR, "jail requires prison ID");
3311                         cmd32->d[0] = (uint32_t)jid;
3312                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3313                         av++;
3314                     }
3315                         break;
3316
3317                 case TOK_ESTAB:
3318                         fill_cmd(cmd, O_ESTAB, 0, 0);
3319                         break;
3320
3321                 case TOK_SETUP:
3322                         fill_cmd(cmd, O_TCPFLAGS, 0,
3323                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3324                         break;
3325
3326                 case TOK_TCPDATALEN:
3327                         NEED1("tcpdatalen requires length");
3328                         if (strpbrk(*av, "-,")) {
3329                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3330                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3331                         } else
3332                             fill_cmd(cmd, O_TCPDATALEN, 0,
3333                                     strtoul(*av, NULL, 0));
3334                         av++;
3335                         break;
3336
3337                 case TOK_TCPOPTS:
3338                         NEED1("missing argument for tcpoptions");
3339                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3340                         av++;
3341                         break;
3342
3343                 case TOK_TCPSEQ:
3344                 case TOK_TCPACK:
3345                         NEED1("tcpseq/tcpack requires argument");
3346                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3347                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3348                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3349                         av++;
3350                         break;
3351
3352                 case TOK_TCPWIN:
3353                         NEED1("tcpwin requires length");
3354                         fill_cmd(cmd, O_TCPWIN, 0,
3355                             htons(strtoul(*av, NULL, 0)));
3356                         av++;
3357                         break;
3358
3359                 case TOK_TCPFLAGS:
3360                         NEED1("missing argument for tcpflags");
3361                         cmd->opcode = O_TCPFLAGS;
3362                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3363                         av++;
3364                         break;
3365
3366                 case TOK_KEEPSTATE:
3367                         if (open_par)
3368                                 errx(EX_USAGE, "keep-state cannot be part "
3369                                     "of an or block");
3370                         if (have_state)
3371                                 errx(EX_USAGE, "only one of keep-state "
3372                                         "and limit is allowed");
3373                         have_state = cmd;
3374                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3375                         break;
3376
3377                 case TOK_LIMIT: {
3378                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3379                         int val;
3380
3381                         if (open_par)
3382                                 errx(EX_USAGE,
3383                                     "limit cannot be part of an or block");
3384                         if (have_state)
3385                                 errx(EX_USAGE, "only one of keep-state and "
3386                                     "limit is allowed");
3387                         have_state = cmd;
3388
3389                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3390                         cmd->opcode = O_LIMIT;
3391                         c->limit_mask = c->conn_limit = 0;
3392
3393                         while ( av[0] != NULL ) {
3394                                 if ((val = match_token(limit_masks, *av)) <= 0)
3395                                         break;
3396                                 c->limit_mask |= val;
3397                                 av++;
3398                         }
3399
3400                         if (c->limit_mask == 0)
3401                                 errx(EX_USAGE, "limit: missing limit mask");
3402
3403                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3404                             TOK_LIMIT, rule_options);
3405
3406                         av++;
3407                         break;
3408                 }
3409
3410                 case TOK_PROTO:
3411                         NEED1("missing protocol");
3412                         if (add_proto(cmd, *av, &proto)) {
3413                                 av++;
3414                         } else
3415                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3416                                     *av);
3417                         break;
3418
3419                 case TOK_SRCIP:
3420                         NEED1("missing source IP");
3421                         if (add_srcip(cmd, *av)) {
3422                                 av++;
3423                         }
3424                         break;
3425
3426                 case TOK_DSTIP:
3427                         NEED1("missing destination IP");
3428                         if (add_dstip(cmd, *av)) {
3429                                 av++;
3430                         }
3431                         break;
3432
3433                 case TOK_SRCIP6:
3434                         NEED1("missing source IP6");
3435                         if (add_srcip6(cmd, *av)) {
3436                                 av++;
3437                         }
3438                         break;
3439
3440                 case TOK_DSTIP6:
3441                         NEED1("missing destination IP6");
3442                         if (add_dstip6(cmd, *av)) {
3443                                 av++;
3444                         }
3445                         break;
3446
3447                 case TOK_SRCPORT:
3448                         NEED1("missing source port");
3449                         if (_substrcmp(*av, "any") == 0 ||
3450                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3451                                 av++;
3452                         } else
3453                                 errx(EX_DATAERR, "invalid source port %s", *av);
3454                         break;
3455
3456                 case TOK_DSTPORT:
3457                         NEED1("missing destination port");
3458                         if (_substrcmp(*av, "any") == 0 ||
3459                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3460                                 av++;
3461                         } else
3462                                 errx(EX_DATAERR, "invalid destination port %s",
3463                                     *av);
3464                         break;
3465
3466                 case TOK_MAC:
3467                         if (add_mac(cmd, av))
3468                                 av += 2;
3469                         break;
3470
3471                 case TOK_MACTYPE:
3472                         NEED1("missing mac type");
3473                         if (!add_mactype(cmd, *av))
3474                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3475                         av++;
3476                         break;
3477
3478                 case TOK_VERREVPATH:
3479                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3480                         break;
3481
3482                 case TOK_VERSRCREACH:
3483                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3484                         break;
3485
3486                 case TOK_ANTISPOOF:
3487                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3488                         break;
3489
3490                 case TOK_IPSEC:
3491                         fill_cmd(cmd, O_IPSEC, 0, 0);
3492                         break;
3493
3494                 case TOK_IPV6:
3495                         fill_cmd(cmd, O_IP6, 0, 0);
3496                         break;
3497
3498                 case TOK_IPV4:
3499                         fill_cmd(cmd, O_IP4, 0, 0);
3500                         break;
3501
3502                 case TOK_EXT6HDR:
3503                         fill_ext6hdr( cmd, *av );
3504                         av++;
3505                         break;
3506
3507                 case TOK_FLOWID:
3508                         if (proto != IPPROTO_IPV6 )
3509                                 errx( EX_USAGE, "flow-id filter is active "
3510                                     "only for ipv6 protocol\n");
3511                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3512                         av++;
3513                         break;
3514
3515                 case TOK_COMMENT:
3516                         fill_comment(cmd, av);
3517                         av[0]=NULL;
3518                         break;
3519
3520                 case TOK_TAGGED:
3521                         if (av[0] && strpbrk(*av, "-,")) {
3522                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3523                                         errx(EX_DATAERR, "tagged: invalid tag"
3524                                             " list: %s", *av);
3525                         }
3526                         else {
3527                                 uint16_t tag;
3528
3529                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3530                                     TOK_TAGGED, rule_options);
3531                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3532                         }
3533                         av++;
3534                         break;
3535
3536                 case TOK_FIB:
3537                         NEED1("fib requires fib number");
3538                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3539                         av++;
3540                         break;
3541
3542                 case TOK_LOOKUP: {
3543                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3544                         char *p;
3545                         int j;
3546
3547                         if (!av[0] || !av[1])
3548                                 errx(EX_USAGE, "format: lookup argument tablenum");
3549                         cmd->opcode = O_IP_DST_LOOKUP;
3550                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3551                         i = match_token(rule_options, *av);
3552                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3553                                 if (i == lookup_key[j])
3554                                         break;
3555                         }
3556                         if (lookup_key[j] <= 0)
3557                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3558                         c->d[1] = j; // i converted to option
3559                         av++;
3560                         cmd->arg1 = strtoul(*av, &p, 0);
3561                         if (p && *p)
3562                                 errx(EX_USAGE, "format: lookup argument tablenum");
3563                         av++;
3564                     }
3565                         break;
3566
3567                 default:
3568                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3569                 }
3570                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3571                         prev = cmd;
3572                         cmd = next_cmd(cmd);
3573                 }
3574         }
3575
3576 done:
3577         /*
3578          * Now copy stuff into the rule.
3579          * If we have a keep-state option, the first instruction
3580          * must be a PROBE_STATE (which is generated here).
3581          * If we have a LOG option, it was stored as the first command,
3582          * and now must be moved to the top of the action part.
3583          */
3584         dst = (ipfw_insn *)rule->cmd;
3585
3586         /*
3587          * First thing to write into the command stream is the match probability.
3588          */
3589         if (match_prob != 1) { /* 1 means always match */
3590                 dst->opcode = O_PROB;
3591                 dst->len = 2;
3592                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3593                 dst += dst->len;
3594         }
3595
3596         /*
3597          * generate O_PROBE_STATE if necessary
3598          */
3599         if (have_state && have_state->opcode != O_CHECK_STATE) {
3600                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3601                 dst = next_cmd(dst);
3602         }
3603
3604         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3605         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3606                 i = F_LEN(src);
3607
3608                 switch (src->opcode) {
3609                 case O_LOG:
3610                 case O_KEEP_STATE:
3611                 case O_LIMIT:
3612                 case O_ALTQ:
3613                 case O_TAG:
3614                         break;
3615                 default:
3616                         bcopy(src, dst, i * sizeof(uint32_t));
3617                         dst += i;
3618                 }
3619         }
3620
3621         /*
3622          * put back the have_state command as last opcode
3623          */
3624         if (have_state && have_state->opcode != O_CHECK_STATE) {
3625                 i = F_LEN(have_state);
3626                 bcopy(have_state, dst, i * sizeof(uint32_t));
3627                 dst += i;
3628         }
3629         /*
3630          * start action section
3631          */
3632         rule->act_ofs = dst - rule->cmd;
3633
3634         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3635         if (have_log) {
3636                 i = F_LEN(have_log);
3637                 bcopy(have_log, dst, i * sizeof(uint32_t));
3638                 dst += i;
3639         }
3640         if (have_altq) {
3641                 i = F_LEN(have_altq);
3642                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3643                 dst += i;
3644         }
3645         if (have_tag) {
3646                 i = F_LEN(have_tag);
3647                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3648                 dst += i;
3649         }
3650         /*
3651          * copy all other actions
3652          */
3653         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3654                 i = F_LEN(src);
3655                 bcopy(src, dst, i * sizeof(uint32_t));
3656                 dst += i;
3657         }
3658
3659         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3660         i = (char *)dst - (char *)rule;
3661         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3662                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3663         if (!co.do_quiet)
3664                 show_ipfw(rule, 0, 0);
3665 }
3666
3667 /*
3668  * clear the counters or the log counters.
3669  */
3670 void
3671 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3672 {
3673         uint32_t arg, saved_arg;
3674         int failed = EX_OK;
3675         char const *errstr;
3676         char const *name = optname ? "RESETLOG" : "ZERO";
3677
3678         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3679
3680         av++; ac--;
3681
3682         if (!ac) {
3683                 /* clear all entries */
3684                 if (do_cmd(optname, NULL, 0) < 0)
3685                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3686                 if (!co.do_quiet)
3687                         printf("%s.\n", optname == IP_FW_ZERO ?
3688                             "Accounting cleared":"Logging counts reset");
3689
3690                 return;
3691         }
3692
3693         while (ac) {
3694                 /* Rule number */
3695                 if (isdigit(**av)) {
3696                         arg = strtonum(*av, 0, 0xffff, &errstr);
3697                         if (errstr)
3698                                 errx(EX_DATAERR,
3699                                     "invalid rule number %s\n", *av);
3700                         saved_arg = arg;
3701                         if (co.use_set)
3702                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3703                         av++;
3704                         ac--;
3705                         if (do_cmd(optname, &arg, sizeof(arg))) {
3706                                 warn("rule %u: setsockopt(IP_FW_%s)",
3707                                     saved_arg, name);
3708                                 failed = EX_UNAVAILABLE;
3709                         } else if (!co.do_quiet)
3710                                 printf("Entry %d %s.\n", saved_arg,
3711                                     optname == IP_FW_ZERO ?
3712                                         "cleared" : "logging count reset");
3713                 } else {
3714                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3715                 }
3716         }
3717         if (failed != EX_OK)
3718                 exit(failed);
3719 }
3720
3721 void
3722 ipfw_flush(int force)
3723 {
3724         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3725
3726         if (!force && !co.do_quiet) { /* need to ask user */
3727                 int c;
3728
3729                 printf("Are you sure? [yn] ");
3730                 fflush(stdout);
3731                 do {
3732                         c = toupper(getc(stdin));
3733                         while (c != '\n' && getc(stdin) != '\n')
3734                                 if (feof(stdin))
3735                                         return; /* and do not flush */
3736                 } while (c != 'Y' && c != 'N');
3737                 printf("\n");
3738                 if (c == 'N')   /* user said no */
3739                         return;
3740         }
3741         if (co.do_pipe) {
3742                 dummynet_flush();
3743                 return;
3744         }
3745         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3746         if (co.use_set) {
3747                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3748                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3749                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3750         } else if (do_cmd(cmd, NULL, 0) < 0)
3751                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3752                     co.do_pipe ? "DUMMYNET" : "FW");
3753         if (!co.do_quiet)
3754                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3755 }
3756
3757
3758 static void table_list(ipfw_table_entry ent, int need_header);
3759
3760 /*
3761  * This one handles all table-related commands
3762  *      ipfw table N add addr[/masklen] [value]
3763  *      ipfw table N delete addr[/masklen]
3764  *      ipfw table {N | all} flush
3765  *      ipfw table {N | all} list
3766  */
3767 void
3768 ipfw_table_handler(int ac, char *av[])
3769 {
3770         ipfw_table_entry ent;
3771         int do_add;
3772         int is_all;
3773         size_t len;
3774         char *p;
3775         uint32_t a;
3776         uint32_t tables_max;
3777
3778         len = sizeof(tables_max);
3779         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3780                 NULL, 0) == -1) {
3781 #ifdef IPFW_TABLES_MAX
3782                 warn("Warn: Failed to get the max tables number via sysctl. "
3783                      "Using the compiled in defaults. \nThe reason was");
3784                 tables_max = IPFW_TABLES_MAX;
3785 #else
3786                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3787 #endif
3788         }
3789
3790         ac--; av++;
3791         if (ac && isdigit(**av)) {
3792                 ent.tbl = atoi(*av);
3793                 is_all = 0;
3794                 ac--; av++;
3795         } else if (ac && _substrcmp(*av, "all") == 0) {
3796                 ent.tbl = 0;
3797                 is_all = 1;
3798                 ac--; av++;
3799         } else
3800                 errx(EX_USAGE, "table number or 'all' keyword required");
3801         if (ent.tbl >= tables_max)
3802                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3803                         "value (%d)", tables_max - 1);
3804         NEED1("table needs command");
3805         if (is_all && _substrcmp(*av, "list") != 0
3806                    && _substrcmp(*av, "flush") != 0)
3807                 errx(EX_USAGE, "table number required");
3808
3809         if (_substrcmp(*av, "add") == 0 ||
3810             _substrcmp(*av, "delete") == 0) {
3811                 do_add = **av == 'a';
3812                 ac--; av++;
3813                 if (!ac)
3814                         errx(EX_USAGE, "IP address required");
3815                 p = strchr(*av, '/');
3816                 if (p) {
3817                         *p++ = '\0';
3818                         ent.masklen = atoi(p);
3819                         if (ent.masklen > 32)
3820                                 errx(EX_DATAERR, "bad width ``%s''", p);
3821                 } else
3822                         ent.masklen = 32;
3823                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3824                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3825                 ac--; av++;
3826                 if (do_add && ac) {
3827                         unsigned int tval;
3828                         /* isdigit is a bit of a hack here.. */
3829                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3830                                 ent.value = strtoul(*av, NULL, 0);
3831                         } else {
3832                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3833                                         /* The value must be stored in host order        *
3834                                          * so that the values < 65k can be distinguished */
3835                                         ent.value = ntohl(tval);
3836                                 } else {
3837                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3838                                 }
3839                         }
3840                 } else
3841                         ent.value = 0;
3842                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3843                     &ent, sizeof(ent)) < 0) {
3844                         /* If running silent, don't bomb out on these errors. */
3845                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3846                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3847                                     do_add ? "ADD" : "DEL");
3848                         /* In silent mode, react to a failed add by deleting */
3849                         if (do_add) {
3850                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3851                                 if (do_cmd(IP_FW_TABLE_ADD,
3852                                     &ent, sizeof(ent)) < 0)
3853                                         err(EX_OSERR,
3854                                             "setsockopt(IP_FW_TABLE_ADD)");
3855                         }
3856                 }
3857         } else if (_substrcmp(*av, "flush") == 0) {
3858                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3859                 do {
3860                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3861                             sizeof(ent.tbl)) < 0)
3862                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3863                 } while (++ent.tbl < a);
3864         } else if (_substrcmp(*av, "list") == 0) {
3865                 a = is_all ? tables_max : (uint32_t)(ent.tbl + 1);
3866                 do {
3867                         table_list(ent, is_all);
3868                 } while (++ent.tbl < a);
3869         } else
3870                 errx(EX_USAGE, "invalid table command %s", *av);
3871 }
3872
3873 static void
3874 table_list(ipfw_table_entry ent, int need_header)
3875 {
3876         ipfw_table *tbl;
3877         socklen_t l;
3878         uint32_t a;
3879
3880         a = ent.tbl;
3881         l = sizeof(a);
3882         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3883                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3884
3885         /* If a is zero we have nothing to do, the table is empty. */
3886         if (a == 0)
3887                 return;
3888
3889         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3890         tbl = safe_calloc(1, l);
3891         tbl->tbl = ent.tbl;
3892         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3893                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3894         if (tbl->cnt && need_header)
3895                 printf("---table(%d)---\n", tbl->tbl);
3896         for (a = 0; a < tbl->cnt; a++) {
3897                 unsigned int tval;
3898                 tval = tbl->ent[a].value;
3899                 if (co.do_value_as_ip) {
3900                         char tbuf[128];
3901                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
3902                                 &tbl->ent[a].addr), 127);
3903                         /* inet_ntoa expects network order */
3904                         tval = htonl(tval);
3905                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
3906                                 inet_ntoa(*(struct in_addr *)&tval));
3907                 } else {
3908                         printf("%s/%u %u\n",
3909                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
3910                                 tbl->ent[a].masklen, tval);
3911                 }
3912         }
3913         free(tbl);
3914 }