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 187983 2009-02-01 16:00:49Z 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 #include <fcntl.h>
  44
  45 #include <net/ethernet.h>
  46 #include <net/if.h>             /* only IFNAMSIZ */
  47 #include <netinet/in.h>
  48 #include <netinet/in_systm.h>   /* only n_short, n_long */
  49 #include <netinet/ip.h>
  50 #include <netinet/ip_icmp.h>
  51 #include <netinet/ip_fw.h>
  52 #include <netinet/tcp.h>
  53 #include <arpa/inet.h>
  54
  55 struct cmdline_opts co; /* global options */
  56
  57 int resvd_set_number = RESVD_SET;
  58
  59 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  60         if (!ac)                                                        \
  61                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  62         if (_substrcmp(*av, "tablearg") == 0) {                         \
  63                 arg = IP_FW_TABLEARG;                                   \
  64                 break;                                                  \
  65         }                                                               \
  66                                                                         \
  67         {                                                               \
  68         long val;                                                       \
  69         char *end;                                                      \
  70                                                                         \
  71         val = strtol(*av, &end, 10);                                    \
  72                                                                         \
  73         if (!isdigit(**av) || *end != '\0' || (val == 0 && errno == EINVAL)) \
  74                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  75                     match_value(s_x, tok), *av);                        \
  76                                                                         \
  77         if (errno == ERANGE || val < min || val > max)                  \
  78                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
  79                     match_value(s_x, tok), min, max, *av);              \
  80                                                                         \
  81         if (val == IP_FW_TABLEARG)                                      \
  82                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
  83                     match_value(s_x, tok), *av);                        \
  84         arg = val;                                                      \
  85         }                                                               \
  86 } while (0)
  87
  88 static void
  89 PRINT_UINT_ARG(const char *str, uint32_t arg)
  90 {
  91         if (str != NULL)
  92                 printf("%s",str);
  93         if (arg == IP_FW_TABLEARG)
  94                 printf("tablearg");
  95         else
  96                 printf("%u", arg);
  97 }
  98
  99 static struct _s_x f_tcpflags[] = {
 100         { "syn", TH_SYN },
 101         { "fin", TH_FIN },
 102         { "ack", TH_ACK },
 103         { "psh", TH_PUSH },
 104         { "rst", TH_RST },
 105         { "urg", TH_URG },
 106         { "tcp flag", 0 },
 107         { NULL, 0 }
 108 };
 109
 110 static struct _s_x f_tcpopts[] = {
 111         { "mss",        IP_FW_TCPOPT_MSS },
 112         { "maxseg",     IP_FW_TCPOPT_MSS },
 113         { "window",     IP_FW_TCPOPT_WINDOW },
 114         { "sack",       IP_FW_TCPOPT_SACK },
 115         { "ts",         IP_FW_TCPOPT_TS },
 116         { "timestamp",  IP_FW_TCPOPT_TS },
 117         { "cc",         IP_FW_TCPOPT_CC },
 118         { "tcp option", 0 },
 119         { NULL, 0 }
 120 };
 121
 122 /*
 123  * IP options span the range 0 to 255 so we need to remap them
 124  * (though in fact only the low 5 bits are significant).
 125  */
 126 static struct _s_x f_ipopts[] = {
 127         { "ssrr",       IP_FW_IPOPT_SSRR},
 128         { "lsrr",       IP_FW_IPOPT_LSRR},
 129         { "rr",         IP_FW_IPOPT_RR},
 130         { "ts",         IP_FW_IPOPT_TS},
 131         { "ip option",  0 },
 132         { NULL, 0 }
 133 };
 134
 135 static struct _s_x f_iptos[] = {
 136         { "lowdelay",   IPTOS_LOWDELAY},
 137         { "throughput", IPTOS_THROUGHPUT},
 138         { "reliability", IPTOS_RELIABILITY},
 139         { "mincost",    IPTOS_MINCOST},
 140         { "congestion", IPTOS_ECN_CE},
 141         { "ecntransport", IPTOS_ECN_ECT0},
 142         { "ip tos option", 0},
 143         { NULL, 0 }
 144 };
 145
 146 static struct _s_x limit_masks[] = {
 147         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 148         {"src-addr",    DYN_SRC_ADDR},
 149         {"src-port",    DYN_SRC_PORT},
 150         {"dst-addr",    DYN_DST_ADDR},
 151         {"dst-port",    DYN_DST_PORT},
 152         {NULL,          0}
 153 };
 154
 155 /*
 156  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 157  * This is only used in this code.
 158  */
 159 #define IPPROTO_ETHERTYPE       0x1000
 160 static struct _s_x ether_types[] = {
 161     /*
 162      * Note, we cannot use "-:&/" in the names because they are field
 163      * separators in the type specifications. Also, we use s = NULL as
 164      * end-delimiter, because a type of 0 can be legal.
 165      */
 166         { "ip",         0x0800 },
 167         { "ipv4",       0x0800 },
 168         { "ipv6",       0x86dd },
 169         { "arp",        0x0806 },
 170         { "rarp",       0x8035 },
 171         { "vlan",       0x8100 },
 172         { "loop",       0x9000 },
 173         { "trail",      0x1000 },
 174         { "at",         0x809b },
 175         { "atalk",      0x809b },
 176         { "aarp",       0x80f3 },
 177         { "pppoe_disc", 0x8863 },
 178         { "pppoe_sess", 0x8864 },
 179         { "ipx_8022",   0x00E0 },
 180         { "ipx_8023",   0x0000 },
 181         { "ipx_ii",     0x8137 },
 182         { "ipx_snap",   0x8137 },
 183         { "ipx",        0x8137 },
 184         { "ns",         0x0600 },
 185         { NULL,         0 }
 186 };
 187
 188
 189 static struct _s_x rule_actions[] = {
 190         { "accept",             TOK_ACCEPT },
 191         { "pass",               TOK_ACCEPT },
 192         { "allow",              TOK_ACCEPT },
 193         { "permit",             TOK_ACCEPT },
 194         { "count",              TOK_COUNT },
 195         { "pipe",               TOK_PIPE },
 196         { "queue",              TOK_QUEUE },
 197         { "divert",             TOK_DIVERT },
 198         { "tee",                TOK_TEE },
 199         { "netgraph",           TOK_NETGRAPH },
 200         { "ngtee",              TOK_NGTEE },
 201         { "fwd",                TOK_FORWARD },
 202         { "forward",            TOK_FORWARD },
 203         { "skipto",             TOK_SKIPTO },
 204         { "deny",               TOK_DENY },
 205         { "drop",               TOK_DENY },
 206         { "reject",             TOK_REJECT },
 207         { "reset6",             TOK_RESET6 },
 208         { "reset",              TOK_RESET },
 209         { "unreach6",           TOK_UNREACH6 },
 210         { "unreach",            TOK_UNREACH },
 211         { "check-state",        TOK_CHECKSTATE },
 212         { "//",                 TOK_COMMENT },
 213         { "nat",                TOK_NAT },
 214         { "reass",              TOK_REASS },
 215         { "setfib",             TOK_SETFIB },
 216         { NULL, 0 }     /* terminator */
 217 };
 218
 219 static struct _s_x rule_action_params[] = {
 220         { "altq",               TOK_ALTQ },
 221         { "log",                TOK_LOG },
 222         { "tag",                TOK_TAG },
 223         { "untag",              TOK_UNTAG },
 224         { NULL, 0 }     /* terminator */
 225 };
 226
 227 static struct _s_x rule_options[] = {
 228         { "tagged",             TOK_TAGGED },
 229         { "uid",                TOK_UID },
 230         { "gid",                TOK_GID },
 231         { "jail",               TOK_JAIL },
 232         { "in",                 TOK_IN },
 233         { "limit",              TOK_LIMIT },
 234         { "keep-state",         TOK_KEEPSTATE },
 235         { "bridged",            TOK_LAYER2 },
 236         { "layer2",             TOK_LAYER2 },
 237         { "out",                TOK_OUT },
 238         { "diverted",           TOK_DIVERTED },
 239         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 240         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 241         { "xmit",               TOK_XMIT },
 242         { "recv",               TOK_RECV },
 243         { "via",                TOK_VIA },
 244         { "fragment",           TOK_FRAG },
 245         { "frag",               TOK_FRAG },
 246         { "fib",                TOK_FIB },
 247         { "ipoptions",          TOK_IPOPTS },
 248         { "ipopts",             TOK_IPOPTS },
 249         { "iplen",              TOK_IPLEN },
 250         { "ipid",               TOK_IPID },
 251         { "ipprecedence",       TOK_IPPRECEDENCE },
 252         { "iptos",              TOK_IPTOS },
 253         { "ipttl",              TOK_IPTTL },
 254         { "ipversion",          TOK_IPVER },
 255         { "ipver",              TOK_IPVER },
 256         { "estab",              TOK_ESTAB },
 257         { "established",        TOK_ESTAB },
 258         { "setup",              TOK_SETUP },
 259         { "tcpdatalen",         TOK_TCPDATALEN },
 260         { "tcpflags",           TOK_TCPFLAGS },
 261         { "tcpflgs",            TOK_TCPFLAGS },
 262         { "tcpoptions",         TOK_TCPOPTS },
 263         { "tcpopts",            TOK_TCPOPTS },
 264         { "tcpseq",             TOK_TCPSEQ },
 265         { "tcpack",             TOK_TCPACK },
 266         { "tcpwin",             TOK_TCPWIN },
 267         { "icmptype",           TOK_ICMPTYPES },
 268         { "icmptypes",          TOK_ICMPTYPES },
 269         { "dst-ip",             TOK_DSTIP },
 270         { "src-ip",             TOK_SRCIP },
 271         { "dst-port",           TOK_DSTPORT },
 272         { "src-port",           TOK_SRCPORT },
 273         { "proto",              TOK_PROTO },
 274         { "MAC",                TOK_MAC },
 275         { "mac",                TOK_MAC },
 276         { "mac-type",           TOK_MACTYPE },
 277         { "verrevpath",         TOK_VERREVPATH },
 278         { "versrcreach",        TOK_VERSRCREACH },
 279         { "antispoof",          TOK_ANTISPOOF },
 280         { "ipsec",              TOK_IPSEC },
 281         { "icmp6type",          TOK_ICMP6TYPES },
 282         { "icmp6types",         TOK_ICMP6TYPES },
 283         { "ext6hdr",            TOK_EXT6HDR},
 284         { "flow-id",            TOK_FLOWID},
 285         { "ipv6",               TOK_IPV6},
 286         { "ip6",                TOK_IPV6},
 287         { "ipv4",               TOK_IPV4},
 288         { "ip4",                TOK_IPV4},
 289         { "dst-ipv6",           TOK_DSTIP6},
 290         { "dst-ip6",            TOK_DSTIP6},
 291         { "src-ipv6",           TOK_SRCIP6},
 292         { "src-ip6",            TOK_SRCIP6},
 293         { "//",                 TOK_COMMENT },
 294
 295         { "not",                TOK_NOT },              /* pseudo option */
 296         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 297         { "or",                 TOK_OR },               /* pseudo option */
 298         { "|", /* escape */     TOK_OR },               /* pseudo option */
 299         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 300         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 301         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 302         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 303         { NULL, 0 }     /* terminator */
 304 };
 305
 306 /*
 307  * The following is used to generate a printable argument for
 308  * 64-bit numbers, irrespective of platform alignment and bit size.
 309  * Because all the printf in this program use %llu as a format,
 310  * we just return an unsigned long long, which is larger than
 311  * we need in certain cases, but saves the hassle of using
 312  * PRIu64 as a format specifier.
 313  * We don't care about inlining, this is not performance critical code.
 314  */
 315 unsigned long long
 316 align_uint64(const uint64_t *pll)
 317 {
 318         uint64_t ret;
 319
 320         bcopy (pll, &ret, sizeof(ret));
 321         return ret;
 322 }
 323
 324 void *
 325 safe_calloc(size_t number, size_t size)
 326 {
 327         void *ret = calloc(number, size);
 328
 329         if (ret == NULL)
 330                 err(EX_OSERR, "calloc");
 331         return ret;
 332 }
 333
 334 void *
 335 safe_realloc(void *ptr, size_t size)
 336 {
 337         void *ret = realloc(ptr, size);
 338
 339         if (ret == NULL)
 340                 err(EX_OSERR, "realloc");
 341         return ret;
 342 }
 343
 344 /*
 345  * conditionally runs the command.
 346  */
 347 int
 348 do_cmd(int optname, void *optval, uintptr_t optlen)
 349 {
 350         static int s = -1;      /* the socket */
 351         int i;
 352
 353         if (co.test_only)
 354                 return 0;
 355
 356         if (s == -1)
 357                 s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 358         if (s < 0)
 359                 err(EX_UNAVAILABLE, "socket");
 360
 361         if (optname == IP_FW_GET || optname == IP_FW_DYN_GET ||
 362             optname == IP_DUMMYNET_GET ||
 363             optname == IP_FW_ADD || optname == IP_FW_TABLE_LIST ||
 364             optname == IP_FW_TABLE_GETSIZE ||
 365             optname == IP_FW_NAT_GET_CONFIG ||
 366             optname == IP_FW_NAT_GET_LOG)
 367                 i = getsockopt(s, IPPROTO_IP, optname, optval,
 368                         (socklen_t *)optlen);
 369         else
 370                 i = setsockopt(s, IPPROTO_IP, optname, optval, optlen);
 371         return i;
 372 }
 373
 374 /**
 375  * match_token takes a table and a string, returns the value associated
 376  * with the string (-1 in case of failure).
 377  */
 378 int
 379 match_token(struct _s_x *table, char *string)
 380 {
 381         struct _s_x *pt;
 382         uint i = strlen(string);
 383
 384         for (pt = table ; i && pt->s != NULL ; pt++)
 385                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 386                         return pt->x;
 387         return -1;
 388 }
 389
 390 /**
 391  * match_value takes a table and a value, returns the string associated
 392  * with the value (NULL in case of failure).
 393  */
 394 char const *
 395 match_value(struct _s_x *p, int value)
 396 {
 397         for (; p->s != NULL; p++)
 398                 if (p->x == value)
 399                         return p->s;
 400         return NULL;
 401 }
 402
 403 /*
 404  * _substrcmp takes two strings and returns 1 if they do not match,
 405  * and 0 if they match exactly or the first string is a sub-string
 406  * of the second.  A warning is printed to stderr in the case that the
 407  * first string is a sub-string of the second.
 408  *
 409  * This function will be removed in the future through the usual
 410  * deprecation process.
 411  */
 412 int
 413 _substrcmp(const char *str1, const char* str2)
 414 {
 415
 416         if (strncmp(str1, str2, strlen(str1)) != 0)
 417                 return 1;
 418
 419         if (strlen(str1) != strlen(str2))
 420                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 421                     str1, str2);
 422         return 0;
 423 }
 424
 425 /*
 426  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 427  * and 0 if they match exactly or the second string is a sub-string
 428  * of the first.  A warning is printed to stderr in the case that the
 429  * first string does not match the third.
 430  *
 431  * This function exists to warn about the bizzare construction
 432  * strncmp(str, "by", 2) which is used to allow people to use a shotcut
 433  * for "bytes".  The problem is that in addition to accepting "by",
 434  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 435  * other string beginning with "by".
 436  *
 437  * This function will be removed in the future through the usual
 438  * deprecation process.
 439  */
 440 int
 441 _substrcmp2(const char *str1, const char* str2, const char* str3)
 442 {
 443
 444         if (strncmp(str1, str2, strlen(str2)) != 0)
 445                 return 1;
 446
 447         if (strcmp(str1, str3) != 0)
 448                 warnx("DEPRECATED: '%s' matched '%s'",
 449                     str1, str3);
 450         return 0;
 451 }
 452
 453 /*
 454  * prints one port, symbolic or numeric
 455  */
 456 static void
 457 print_port(int proto, uint16_t port)
 458 {
 459
 460         if (proto == IPPROTO_ETHERTYPE) {
 461                 char const *s;
 462
 463                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 464                         printf("%s", s);
 465                 else
 466                         printf("0x%04x", port);
 467         } else {
 468                 struct servent *se = NULL;
 469                 if (co.do_resolv) {
 470                         struct protoent *pe = getprotobynumber(proto);
 471
 472                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 473                 }
 474                 if (se)
 475                         printf("%s", se->s_name);
 476                 else
 477                         printf("%d", port);
 478         }
 479 }
 480
 481 static struct _s_x _port_name[] = {
 482         {"dst-port",    O_IP_DSTPORT},
 483         {"src-port",    O_IP_SRCPORT},
 484         {"ipid",        O_IPID},
 485         {"iplen",       O_IPLEN},
 486         {"ipttl",       O_IPTTL},
 487         {"mac-type",    O_MAC_TYPE},
 488         {"tcpdatalen",  O_TCPDATALEN},
 489         {"tagged",      O_TAGGED},
 490         {NULL,          0}
 491 };
 492
 493 /*
 494  * Print the values in a list 16-bit items of the types above.
 495  * XXX todo: add support for mask.
 496  */
 497 static void
 498 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 499 {
 500         uint16_t *p = cmd->ports;
 501         int i;
 502         char const *sep;
 503
 504         if (opcode != 0) {
 505                 sep = match_value(_port_name, opcode);
 506                 if (sep == NULL)
 507                         sep = "???";
 508                 printf (" %s", sep);
 509         }
 510         sep = " ";
 511         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 512                 printf("%s", sep);
 513                 print_port(proto, p[0]);
 514                 if (p[0] != p[1]) {
 515                         printf("-");
 516                         print_port(proto, p[1]);
 517                 }
 518                 sep = ",";
 519         }
 520 }
 521
 522 /*
 523  * Like strtol, but also translates service names into port numbers
 524  * for some protocols.
 525  * In particular:
 526  *      proto == -1 disables the protocol check;
 527  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 528  *      proto == <some value in /etc/protocols> matches the values there.
 529  * Returns *end == s in case the parameter is not found.
 530  */
 531 static int
 532 strtoport(char *s, char **end, int base, int proto)
 533 {
 534         char *p, *buf;
 535         char *s1;
 536         int i;
 537
 538         *end = s;               /* default - not found */
 539         if (*s == '\0')
 540                 return 0;       /* not found */
 541
 542         if (isdigit(*s))
 543                 return strtol(s, end, base);
 544
 545         /*
 546          * find separator. '\\' escapes the next char.
 547          */
 548         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 549                 if (*s1 == '\\' && s1[1] != '\0')
 550                         s1++;
 551
 552         buf = safe_calloc(s1 - s + 1, 1);
 553
 554         /*
 555          * copy into a buffer skipping backslashes
 556          */
 557         for (p = s, i = 0; p != s1 ; p++)
 558                 if (*p != '\\')
 559                         buf[i++] = *p;
 560         buf[i++] = '\0';
 561
 562         if (proto == IPPROTO_ETHERTYPE) {
 563                 i = match_token(ether_types, buf);
 564                 free(buf);
 565                 if (i != -1) {  /* found */
 566                         *end = s1;
 567                         return i;
 568                 }
 569         } else {
 570                 struct protoent *pe = NULL;
 571                 struct servent *se;
 572
 573                 if (proto != 0)
 574                         pe = getprotobynumber(proto);
 575                 setservent(1);
 576                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 577                 free(buf);
 578                 if (se != NULL) {
 579                         *end = s1;
 580                         return ntohs(se->s_port);
 581                 }
 582         }
 583         return 0;       /* not found */
 584 }
 585
 586 /*
 587  * Fill the body of the command with the list of port ranges.
 588  */
 589 static int
 590 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 591 {
 592         uint16_t a, b, *p = cmd->ports;
 593         int i = 0;
 594         char *s = av;
 595
 596         while (*s) {
 597                 a = strtoport(av, &s, 0, proto);
 598                 if (s == av)                    /* empty or invalid argument */
 599                         return (0);
 600
 601                 switch (*s) {
 602                 case '-':                       /* a range */
 603                         av = s + 1;
 604                         b = strtoport(av, &s, 0, proto);
 605                         /* Reject expressions like '1-abc' or '1-2-3'. */
 606                         if (s == av || (*s != ',' && *s != '\0'))
 607                                 return (0);
 608                         p[0] = a;
 609                         p[1] = b;
 610                         break;
 611                 case ',':                       /* comma separated list */
 612                 case '\0':
 613                         p[0] = p[1] = a;
 614                         break;
 615                 default:
 616                         warnx("port list: invalid separator <%c> in <%s>",
 617                                 *s, av);
 618                         return (0);
 619                 }
 620
 621                 i++;
 622                 p += 2;
 623                 av = s + 1;
 624         }
 625         if (i > 0) {
 626                 if (i + 1 > F_LEN_MASK)
 627                         errx(EX_DATAERR, "too many ports/ranges\n");
 628                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 629         }
 630         return (i);
 631 }
 632
 633 static struct _s_x icmpcodes[] = {
 634       { "net",                  ICMP_UNREACH_NET },
 635       { "host",                 ICMP_UNREACH_HOST },
 636       { "protocol",             ICMP_UNREACH_PROTOCOL },
 637       { "port",                 ICMP_UNREACH_PORT },
 638       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 639       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 640       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 641       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 642       { "isolated",             ICMP_UNREACH_ISOLATED },
 643       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 644       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 645       { "tosnet",               ICMP_UNREACH_TOSNET },
 646       { "toshost",              ICMP_UNREACH_TOSHOST },
 647       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 648       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 649       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 650       { NULL, 0 }
 651 };
 652
 653 static void
 654 fill_reject_code(u_short *codep, char *str)
 655 {
 656         int val;
 657         char *s;
 658
 659         val = strtoul(str, &s, 0);
 660         if (s == str || *s != '\0' || val >= 0x100)
 661                 val = match_token(icmpcodes, str);
 662         if (val < 0)
 663                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 664         *codep = val;
 665         return;
 666 }
 667
 668 static void
 669 print_reject_code(uint16_t code)
 670 {
 671         char const *s = match_value(icmpcodes, code);
 672
 673         if (s != NULL)
 674                 printf("unreach %s", s);
 675         else
 676                 printf("unreach %u", code);
 677 }
 678
 679 /*
 680  * Returns the number of bits set (from left) in a contiguous bitmask,
 681  * or -1 if the mask is not contiguous.
 682  * XXX this needs a proper fix.
 683  * This effectively works on masks in big-endian (network) format.
 684  * when compiled on little endian architectures.
 685  *
 686  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 687  * the first bit on the wire is bit 0 of the first byte.
 688  * len is the max length in bits.
 689  */
 690 int
 691 contigmask(uint8_t *p, int len)
 692 {
 693         int i, n;
 694
 695         for (i=0; i<len ; i++)
 696                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 697                         break;
 698         for (n=i+1; n < len; n++)
 699                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 700                         return -1; /* mask not contiguous */
 701         return i;
 702 }
 703
 704 /*
 705  * print flags set/clear in the two bitmasks passed as parameters.
 706  * There is a specialized check for f_tcpflags.
 707  */
 708 static void
 709 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 710 {
 711         char const *comma = "";
 712         int i;
 713         uint8_t set = cmd->arg1 & 0xff;
 714         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 715
 716         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 717                 printf(" setup");
 718                 return;
 719         }
 720
 721         printf(" %s ", name);
 722         for (i=0; list[i].x != 0; i++) {
 723                 if (set & list[i].x) {
 724                         set &= ~list[i].x;
 725                         printf("%s%s", comma, list[i].s);
 726                         comma = ",";
 727                 }
 728                 if (clear & list[i].x) {
 729                         clear &= ~list[i].x;
 730                         printf("%s!%s", comma, list[i].s);
 731                         comma = ",";
 732                 }
 733         }
 734 }
 735
 736 /*
 737  * Print the ip address contained in a command.
 738  */
 739 static void
 740 print_ip(ipfw_insn_ip *cmd, char const *s)
 741 {
 742         struct hostent *he = NULL;
 743         int len = F_LEN((ipfw_insn *)cmd);
 744         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 745
 746         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 747
 748         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 749                 printf("me");
 750                 return;
 751         }
 752         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 753             cmd->o.opcode == O_IP_DST_LOOKUP) {
 754                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 755                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 756                         printf(",%u", *a);
 757                 printf(")");
 758                 return;
 759         }
 760         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 761                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 762                 int i, j;
 763                 char comma = '{';
 764
 765                 x = cmd->o.arg1 - 1;
 766                 x = htonl( ~x );
 767                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 768                 printf("%s/%d", inet_ntoa(cmd->addr),
 769                         contigmask((uint8_t *)&x, 32));
 770                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 771                 x &= 0xff; /* base */
 772                 /*
 773                  * Print bits and ranges.
 774                  * Locate first bit set (i), then locate first bit unset (j).
 775                  * If we have 3+ consecutive bits set, then print them as a
 776                  * range, otherwise only print the initial bit and rescan.
 777                  */
 778                 for (i=0; i < cmd->o.arg1; i++)
 779                         if (map[i/32] & (1<<(i & 31))) {
 780                                 for (j=i+1; j < cmd->o.arg1; j++)
 781                                         if (!(map[ j/32] & (1<<(j & 31))))
 782                                                 break;
 783                                 printf("%c%d", comma, i+x);
 784                                 if (j>i+2) { /* range has at least 3 elements */
 785                                         printf("-%d", j-1+x);
 786                                         i = j-1;
 787                                 }
 788                                 comma = ',';
 789                         }
 790                 printf("}");
 791                 return;
 792         }
 793         /*
 794          * len == 2 indicates a single IP, whereas lists of 1 or more
 795          * addr/mask pairs have len = (2n+1). We convert len to n so we
 796          * use that to count the number of entries.
 797          */
 798     for (len = len / 2; len > 0; len--, a += 2) {
 799         int mb =        /* mask length */
 800             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 801                 32 : contigmask((uint8_t *)&(a[1]), 32);
 802         if (mb == 32 && co.do_resolv)
 803                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 804         if (he != NULL)         /* resolved to name */
 805                 printf("%s", he->h_name);
 806         else if (mb == 0)       /* any */
 807                 printf("any");
 808         else {          /* numeric IP followed by some kind of mask */
 809                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 810                 if (mb < 0)
 811                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 812                 else if (mb < 32)
 813                         printf("/%d", mb);
 814         }
 815         if (len > 1)
 816                 printf(",");
 817     }
 818 }
 819
 820 /*
 821  * prints a MAC address/mask pair
 822  */
 823 static void
 824 print_mac(uint8_t *addr, uint8_t *mask)
 825 {
 826         int l = contigmask(mask, 48);
 827
 828         if (l == 0)
 829                 printf(" any");
 830         else {
 831                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 832                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 833                 if (l == -1)
 834                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 835                             mask[0], mask[1], mask[2],
 836                             mask[3], mask[4], mask[5]);
 837                 else if (l < 48)
 838                         printf("/%d", l);
 839         }
 840 }
 841
 842 static void
 843 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 844 {
 845         uint8_t type;
 846
 847         cmd->d[0] = 0;
 848         while (*av) {
 849                 if (*av == ',')
 850                         av++;
 851
 852                 type = strtoul(av, &av, 0);
 853
 854                 if (*av != ',' && *av != '\0')
 855                         errx(EX_DATAERR, "invalid ICMP type");
 856
 857                 if (type > 31)
 858                         errx(EX_DATAERR, "ICMP type out of range");
 859
 860                 cmd->d[0] |= 1 << type;
 861         }
 862         cmd->o.opcode = O_ICMPTYPE;
 863         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 864 }
 865
 866 static void
 867 print_icmptypes(ipfw_insn_u32 *cmd)
 868 {
 869         int i;
 870         char sep= ' ';
 871
 872         printf(" icmptypes");
 873         for (i = 0; i < 32; i++) {
 874                 if ( (cmd->d[0] & (1 << (i))) == 0)
 875                         continue;
 876                 printf("%c%d", sep, i);
 877                 sep = ',';
 878         }
 879 }
 880
 881 /*
 882  * show_ipfw() prints the body of an ipfw rule.
 883  * Because the standard rule has at least proto src_ip dst_ip, we use
 884  * a helper function to produce these entries if not provided explicitly.
 885  * The first argument is the list of fields we have, the second is
 886  * the list of fields we want to be printed.
 887  *
 888  * Special cases if we have provided a MAC header:
 889  *   + if the rule does not contain IP addresses/ports, do not print them;
 890  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 891  *
 892  * Once we have 'have_options', IP header fields are printed as options.
 893  */
 894 #define HAVE_PROTO      0x0001
 895 #define HAVE_SRCIP      0x0002
 896 #define HAVE_DSTIP      0x0004
 897 #define HAVE_PROTO4     0x0008
 898 #define HAVE_PROTO6     0x0010
 899 #define HAVE_OPTIONS    0x8000
 900
 901 #define HAVE_IP         (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
 902 static void
 903 show_prerequisites(int *flags, int want, int cmd __unused)
 904 {
 905         if (co.comment_only)
 906                 return;
 907         if ( (*flags & HAVE_IP) == HAVE_IP)
 908                 *flags |= HAVE_OPTIONS;
 909
 910         if ( !(*flags & HAVE_OPTIONS)) {
 911                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
 912                         if ( (*flags & HAVE_PROTO4))
 913                                 printf(" ip4");
 914                         else if ( (*flags & HAVE_PROTO6))
 915                                 printf(" ip6");
 916                         else
 917                                 printf(" ip");
 918                 }
 919                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 920                         printf(" from any");
 921                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 922                         printf(" to any");
 923         }
 924         *flags |= want;
 925 }
 926
 927 static void
 928 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 929 {
 930         static int twidth = 0;
 931         int l;
 932         ipfw_insn *cmd, *tagptr = NULL;
 933         const char *comment = NULL;     /* ptr to comment if we have one */
 934         int proto = 0;          /* default */
 935         int flags = 0;  /* prerequisites */
 936         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 937         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
 938         int or_block = 0;       /* we are in an or block */
 939         uint32_t set_disable;
 940
 941         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
 942
 943         if (set_disable & (1 << rule->set)) { /* disabled */
 944                 if (!co.show_sets)
 945                         return;
 946                 else
 947                         printf("# DISABLED ");
 948         }
 949         printf("%05u ", rule->rulenum);
 950
 951         if (pcwidth>0 || bcwidth>0)
 952                 printf("%*llu %*llu ", pcwidth, align_uint64(&rule->pcnt),
 953                     bcwidth, align_uint64(&rule->bcnt));
 954
 955         if (co.do_time == 2)
 956                 printf("%10u ", rule->timestamp);
 957         else if (co.do_time == 1) {
 958                 char timestr[30];
 959                 time_t t = (time_t)0;
 960
 961                 if (twidth == 0) {
 962                         strcpy(timestr, ctime(&t));
 963                         *strchr(timestr, '\n') = '\0';
 964                         twidth = strlen(timestr);
 965                 }
 966                 if (rule->timestamp) {
 967                         t = _long_to_time(rule->timestamp);
 968
 969                         strcpy(timestr, ctime(&t));
 970                         *strchr(timestr, '\n') = '\0';
 971                         printf("%s ", timestr);
 972                 } else {
 973                         printf("%*s", twidth, " ");
 974                 }
 975         }
 976
 977         if (co.show_sets)
 978                 printf("set %d ", rule->set);
 979
 980         /*
 981          * print the optional "match probability"
 982          */
 983         if (rule->cmd_len > 0) {
 984                 cmd = rule->cmd ;
 985                 if (cmd->opcode == O_PROB) {
 986                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 987                         double d = 1.0 * p->d[0];
 988
 989                         d = (d / 0x7fffffff);
 990                         printf("prob %f ", d);
 991                 }
 992         }
 993
 994         /*
 995          * first print actions
 996          */
 997         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 998                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 999                 switch(cmd->opcode) {
1000                 case O_CHECK_STATE:
1001                         printf("check-state");
1002                         flags = HAVE_IP; /* avoid printing anything else */
1003                         break;
1004
1005                 case O_ACCEPT:
1006                         printf("allow");
1007                         break;
1008
1009                 case O_COUNT:
1010                         printf("count");
1011                         break;
1012
1013                 case O_DENY:
1014                         printf("deny");
1015                         break;
1016
1017                 case O_REJECT:
1018                         if (cmd->arg1 == ICMP_REJECT_RST)
1019                                 printf("reset");
1020                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1021                                 printf("reject");
1022                         else
1023                                 print_reject_code(cmd->arg1);
1024                         break;
1025
1026                 case O_UNREACH6:
1027                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1028                                 printf("reset6");
1029                         else
1030                                 print_unreach6_code(cmd->arg1);
1031                         break;
1032
1033                 case O_SKIPTO:
1034                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1035                         break;
1036
1037                 case O_PIPE:
1038                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1039                         break;
1040
1041                 case O_QUEUE:
1042                         PRINT_UINT_ARG("queue ", cmd->arg1);
1043                         break;
1044
1045                 case O_DIVERT:
1046                         PRINT_UINT_ARG("divert ", cmd->arg1);
1047                         break;
1048
1049                 case O_TEE:
1050                         PRINT_UINT_ARG("tee ", cmd->arg1);
1051                         break;
1052
1053                 case O_NETGRAPH:
1054                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1055                         break;
1056
1057                 case O_NGTEE:
1058                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1059                         break;
1060
1061                 case O_FORWARD_IP:
1062                     {
1063                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1064
1065                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1066                                 printf("fwd tablearg");
1067                         } else {
1068                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1069                         }
1070                         if (s->sa.sin_port)
1071                                 printf(",%d", s->sa.sin_port);
1072                     }
1073                         break;
1074
1075                 case O_LOG: /* O_LOG is printed last */
1076                         logptr = (ipfw_insn_log *)cmd;
1077                         break;
1078
1079                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1080                         altqptr = (ipfw_insn_altq *)cmd;
1081                         break;
1082
1083                 case O_TAG:
1084                         tagptr = cmd;
1085                         break;
1086
1087                 case O_NAT:
1088                         PRINT_UINT_ARG("nat ", cmd->arg1);
1089                         break;
1090
1091                 case O_SETFIB:
1092                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1093                         break;
1094
1095                 case O_REASS:
1096                         printf("reass");
1097                         break;
1098
1099                 default:
1100                         printf("** unrecognized action %d len %d ",
1101                                 cmd->opcode, cmd->len);
1102                 }
1103         }
1104         if (logptr) {
1105                 if (logptr->max_log > 0)
1106                         printf(" log logamount %d", logptr->max_log);
1107                 else
1108                         printf(" log");
1109         }
1110         if (altqptr) {
1111                 print_altq_cmd(altqptr);
1112         }
1113         if (tagptr) {
1114                 if (tagptr->len & F_NOT)
1115                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1116                 else
1117                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1118         }
1119
1120         /*
1121          * then print the body.
1122          */
1123         for (l = rule->act_ofs, cmd = rule->cmd ;
1124                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1125                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1126                         continue;
1127                 if (cmd->opcode == O_IP4) {
1128                         flags |= HAVE_PROTO4;
1129                         break;
1130                 } else if (cmd->opcode == O_IP6) {
1131                         flags |= HAVE_PROTO6;
1132                         break;
1133                 }
1134         }
1135         if (rule->_pad & 1) {   /* empty rules before options */
1136                 if (!co.do_compact) {
1137                         show_prerequisites(&flags, HAVE_PROTO, 0);
1138                         printf(" from any to any");
1139                 }
1140                 flags |= HAVE_IP | HAVE_OPTIONS;
1141         }
1142
1143         if (co.comment_only)
1144                 comment = "...";
1145
1146         for (l = rule->act_ofs, cmd = rule->cmd ;
1147                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1148                 /* useful alias */
1149                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1150
1151                 if (co.comment_only) {
1152                         if (cmd->opcode != O_NOP)
1153                                 continue;
1154                         printf(" // %s\n", (char *)(cmd + 1));
1155                         return;
1156                 }
1157
1158                 show_prerequisites(&flags, 0, cmd->opcode);
1159
1160                 switch(cmd->opcode) {
1161                 case O_PROB:
1162                         break;  /* done already */
1163
1164                 case O_PROBE_STATE:
1165                         break; /* no need to print anything here */
1166
1167                 case O_IP_SRC:
1168                 case O_IP_SRC_LOOKUP:
1169                 case O_IP_SRC_MASK:
1170                 case O_IP_SRC_ME:
1171                 case O_IP_SRC_SET:
1172                         show_prerequisites(&flags, HAVE_PROTO, 0);
1173                         if (!(flags & HAVE_SRCIP))
1174                                 printf(" from");
1175                         if ((cmd->len & F_OR) && !or_block)
1176                                 printf(" {");
1177                         print_ip((ipfw_insn_ip *)cmd,
1178                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1179                         flags |= HAVE_SRCIP;
1180                         break;
1181
1182                 case O_IP_DST:
1183                 case O_IP_DST_LOOKUP:
1184                 case O_IP_DST_MASK:
1185                 case O_IP_DST_ME:
1186                 case O_IP_DST_SET:
1187                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1188                         if (!(flags & HAVE_DSTIP))
1189                                 printf(" to");
1190                         if ((cmd->len & F_OR) && !or_block)
1191                                 printf(" {");
1192                         print_ip((ipfw_insn_ip *)cmd,
1193                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1194                         flags |= HAVE_DSTIP;
1195                         break;
1196
1197                 case O_IP6_SRC:
1198                 case O_IP6_SRC_MASK:
1199                 case O_IP6_SRC_ME:
1200                         show_prerequisites(&flags, HAVE_PROTO, 0);
1201                         if (!(flags & HAVE_SRCIP))
1202                                 printf(" from");
1203                         if ((cmd->len & F_OR) && !or_block)
1204                                 printf(" {");
1205                         print_ip6((ipfw_insn_ip6 *)cmd,
1206                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1207                         flags |= HAVE_SRCIP | HAVE_PROTO;
1208                         break;
1209
1210                 case O_IP6_DST:
1211                 case O_IP6_DST_MASK:
1212                 case O_IP6_DST_ME:
1213                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1214                         if (!(flags & HAVE_DSTIP))
1215                                 printf(" to");
1216                         if ((cmd->len & F_OR) && !or_block)
1217                                 printf(" {");
1218                         print_ip6((ipfw_insn_ip6 *)cmd,
1219                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1220                         flags |= HAVE_DSTIP;
1221                         break;
1222
1223                 case O_FLOW6ID:
1224                 print_flow6id( (ipfw_insn_u32 *) cmd );
1225                 flags |= HAVE_OPTIONS;
1226                 break;
1227
1228                 case O_IP_DSTPORT:
1229                         show_prerequisites(&flags, HAVE_IP, 0);
1230                 case O_IP_SRCPORT:
1231                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1232                         if ((cmd->len & F_OR) && !or_block)
1233                                 printf(" {");
1234                         if (cmd->len & F_NOT)
1235                                 printf(" not");
1236                         print_newports((ipfw_insn_u16 *)cmd, proto,
1237                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1238                         break;
1239
1240                 case O_PROTO: {
1241                         struct protoent *pe = NULL;
1242
1243                         if ((cmd->len & F_OR) && !or_block)
1244                                 printf(" {");
1245                         if (cmd->len & F_NOT)
1246                                 printf(" not");
1247                         proto = cmd->arg1;
1248                         pe = getprotobynumber(cmd->arg1);
1249                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1250                             !(flags & HAVE_PROTO))
1251                                 show_prerequisites(&flags,
1252                                     HAVE_IP | HAVE_OPTIONS, 0);
1253                         if (flags & HAVE_OPTIONS)
1254                                 printf(" proto");
1255                         if (pe)
1256                                 printf(" %s", pe->p_name);
1257                         else
1258                                 printf(" %u", cmd->arg1);
1259                         }
1260                         flags |= HAVE_PROTO;
1261                         break;
1262
1263                 default: /*options ... */
1264                         if (!(cmd->len & (F_OR|F_NOT)))
1265                                 if (((cmd->opcode == O_IP6) &&
1266                                     (flags & HAVE_PROTO6)) ||
1267                                     ((cmd->opcode == O_IP4) &&
1268                                     (flags & HAVE_PROTO4)))
1269                                         break;
1270                         show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
1271                         if ((cmd->len & F_OR) && !or_block)
1272                                 printf(" {");
1273                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1274                                 printf(" not");
1275                         switch(cmd->opcode) {
1276                         case O_MACADDR2: {
1277                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1278
1279                                 printf(" MAC");
1280                                 print_mac(m->addr, m->mask);
1281                                 print_mac(m->addr + 6, m->mask + 6);
1282                                 }
1283                                 break;
1284
1285                         case O_MAC_TYPE:
1286                                 print_newports((ipfw_insn_u16 *)cmd,
1287                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1288                                 break;
1289
1290
1291                         case O_FRAG:
1292                                 printf(" frag");
1293                                 break;
1294
1295                         case O_FIB:
1296                                 printf(" fib %u", cmd->arg1 );
1297                                 break;
1298
1299                         case O_IN:
1300                                 printf(cmd->len & F_NOT ? " out" : " in");
1301                                 break;
1302
1303                         case O_DIVERTED:
1304                                 switch (cmd->arg1) {
1305                                 case 3:
1306                                         printf(" diverted");
1307                                         break;
1308                                 case 1:
1309                                         printf(" diverted-loopback");
1310                                         break;
1311                                 case 2:
1312                                         printf(" diverted-output");
1313                                         break;
1314                                 default:
1315                                         printf(" diverted-?<%u>", cmd->arg1);
1316                                         break;
1317                                 }
1318                                 break;
1319
1320                         case O_LAYER2:
1321                                 printf(" layer2");
1322                                 break;
1323                         case O_XMIT:
1324                         case O_RECV:
1325                         case O_VIA:
1326                             {
1327                                 char const *s;
1328                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1329
1330                                 if (cmd->opcode == O_XMIT)
1331                                         s = "xmit";
1332                                 else if (cmd->opcode == O_RECV)
1333                                         s = "recv";
1334                                 else /* if (cmd->opcode == O_VIA) */
1335                                         s = "via";
1336                                 if (cmdif->name[0] == '\0')
1337                                         printf(" %s %s", s,
1338                                             inet_ntoa(cmdif->p.ip));
1339                                 else
1340                                         printf(" %s %s", s, cmdif->name);
1341
1342                                 break;
1343                             }
1344                         case O_IPID:
1345                                 if (F_LEN(cmd) == 1)
1346                                     printf(" ipid %u", cmd->arg1 );
1347                                 else
1348                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1349                                         O_IPID);
1350                                 break;
1351
1352                         case O_IPTTL:
1353                                 if (F_LEN(cmd) == 1)
1354                                     printf(" ipttl %u", cmd->arg1 );
1355                                 else
1356                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1357                                         O_IPTTL);
1358                                 break;
1359
1360                         case O_IPVER:
1361                                 printf(" ipver %u", cmd->arg1 );
1362                                 break;
1363
1364                         case O_IPPRECEDENCE:
1365                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1366                                 break;
1367
1368                         case O_IPLEN:
1369                                 if (F_LEN(cmd) == 1)
1370                                     printf(" iplen %u", cmd->arg1 );
1371                                 else
1372                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1373                                         O_IPLEN);
1374                                 break;
1375
1376                         case O_IPOPT:
1377                                 print_flags("ipoptions", cmd, f_ipopts);
1378                                 break;
1379
1380                         case O_IPTOS:
1381                                 print_flags("iptos", cmd, f_iptos);
1382                                 break;
1383
1384                         case O_ICMPTYPE:
1385                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1386                                 break;
1387
1388                         case O_ESTAB:
1389                                 printf(" established");
1390                                 break;
1391
1392                         case O_TCPDATALEN:
1393                                 if (F_LEN(cmd) == 1)
1394                                     printf(" tcpdatalen %u", cmd->arg1 );
1395                                 else
1396                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1397                                         O_TCPDATALEN);
1398                                 break;
1399
1400                         case O_TCPFLAGS:
1401                                 print_flags("tcpflags", cmd, f_tcpflags);
1402                                 break;
1403
1404                         case O_TCPOPTS:
1405                                 print_flags("tcpoptions", cmd, f_tcpopts);
1406                                 break;
1407
1408                         case O_TCPWIN:
1409                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1410                                 break;
1411
1412                         case O_TCPACK:
1413                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1414                                 break;
1415
1416                         case O_TCPSEQ:
1417                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1418                                 break;
1419
1420                         case O_UID:
1421                             {
1422                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1423
1424                                 if (pwd)
1425                                         printf(" uid %s", pwd->pw_name);
1426                                 else
1427                                         printf(" uid %u", cmd32->d[0]);
1428                             }
1429                                 break;
1430
1431                         case O_GID:
1432                             {
1433                                 struct group *grp = getgrgid(cmd32->d[0]);
1434
1435                                 if (grp)
1436                                         printf(" gid %s", grp->gr_name);
1437                                 else
1438                                         printf(" gid %u", cmd32->d[0]);
1439                             }
1440                                 break;
1441
1442                         case O_JAIL:
1443                                 printf(" jail %d", cmd32->d[0]);
1444                                 break;
1445
1446                         case O_VERREVPATH:
1447                                 printf(" verrevpath");
1448                                 break;
1449
1450                         case O_VERSRCREACH:
1451                                 printf(" versrcreach");
1452                                 break;
1453
1454                         case O_ANTISPOOF:
1455                                 printf(" antispoof");
1456                                 break;
1457
1458                         case O_IPSEC:
1459                                 printf(" ipsec");
1460                                 break;
1461
1462                         case O_NOP:
1463                                 comment = (char *)(cmd + 1);
1464                                 break;
1465
1466                         case O_KEEP_STATE:
1467                                 printf(" keep-state");
1468                                 break;
1469
1470                         case O_LIMIT: {
1471                                 struct _s_x *p = limit_masks;
1472                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1473                                 uint8_t x = c->limit_mask;
1474                                 char const *comma = " ";
1475
1476                                 printf(" limit");
1477                                 for (; p->x != 0 ; p++)
1478                                         if ((x & p->x) == p->x) {
1479                                                 x &= ~p->x;
1480                                                 printf("%s%s", comma, p->s);
1481                                                 comma = ",";
1482                                         }
1483                                 PRINT_UINT_ARG(" ", c->conn_limit);
1484                                 break;
1485                         }
1486
1487                         case O_IP6:
1488                                 printf(" ip6");
1489                                 break;
1490
1491                         case O_IP4:
1492                                 printf(" ip4");
1493                                 break;
1494
1495                         case O_ICMP6TYPE:
1496                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1497                                 break;
1498
1499                         case O_EXT_HDR:
1500                                 print_ext6hdr( (ipfw_insn *) cmd );
1501                                 break;
1502
1503                         case O_TAGGED:
1504                                 if (F_LEN(cmd) == 1)
1505                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1506                                 else
1507                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1508                                             O_TAGGED);
1509                                 break;
1510
1511                         default:
1512                                 printf(" [opcode %d len %d]",
1513                                     cmd->opcode, cmd->len);
1514                         }
1515                 }
1516                 if (cmd->len & F_OR) {
1517                         printf(" or");
1518                         or_block = 1;
1519                 } else if (or_block) {
1520                         printf(" }");
1521                         or_block = 0;
1522                 }
1523         }
1524         show_prerequisites(&flags, HAVE_IP, 0);
1525         if (comment)
1526                 printf(" // %s", comment);
1527         printf("\n");
1528 }
1529
1530 static void
1531 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1532 {
1533         struct protoent *pe;
1534         struct in_addr a;
1535         uint16_t rulenum;
1536         char buf[INET6_ADDRSTRLEN];
1537
1538         if (!co.do_expired) {
1539                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1540                         return;
1541         }
1542         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1543         printf("%05d", rulenum);
1544         if (pcwidth>0 || bcwidth>0)
1545             printf(" %*llu %*llu (%ds)", pcwidth,
1546                 align_uint64(&d->pcnt), bcwidth,
1547                 align_uint64(&d->bcnt), d->expire);
1548         switch (d->dyn_type) {
1549         case O_LIMIT_PARENT:
1550                 printf(" PARENT %d", d->count);
1551                 break;
1552         case O_LIMIT:
1553                 printf(" LIMIT");
1554                 break;
1555         case O_KEEP_STATE: /* bidir, no mask */
1556                 printf(" STATE");
1557                 break;
1558         }
1559
1560         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1561                 printf(" %s", pe->p_name);
1562         else
1563                 printf(" proto %u", d->id.proto);
1564
1565         if (d->id.addr_type == 4) {
1566                 a.s_addr = htonl(d->id.src_ip);
1567                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1568
1569                 a.s_addr = htonl(d->id.dst_ip);
1570                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1571         } else if (d->id.addr_type == 6) {
1572                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1573                     sizeof(buf)), d->id.src_port);
1574                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1575                     sizeof(buf)), d->id.dst_port);
1576         } else
1577                 printf(" UNKNOWN <-> UNKNOWN\n");
1578
1579         printf("\n");
1580 }
1581
1582 /*
1583  * This one handles all set-related commands
1584  *      ipfw set { show | enable | disable }
1585  *      ipfw set swap X Y
1586  *      ipfw set move X to Y
1587  *      ipfw set move rule X to Y
1588  */
1589 void
1590 ipfw_sets_handler(int ac, char *av[])
1591 {
1592         uint32_t set_disable, masks[2];
1593         int i, nbytes;
1594         uint16_t rulenum;
1595         uint8_t cmd, new_set;
1596
1597         ac--;
1598         av++;
1599
1600         if (!ac)
1601                 errx(EX_USAGE, "set needs command");
1602         if (_substrcmp(*av, "show") == 0) {
1603                 void *data;
1604                 char const *msg;
1605
1606                 nbytes = sizeof(struct ip_fw);
1607                 data = safe_calloc(1, nbytes);
1608                 if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1609                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1610                 bcopy(&((struct ip_fw *)data)->next_rule,
1611                         &set_disable, sizeof(set_disable));
1612
1613                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1614                         if ((set_disable & (1<<i))) {
1615                                 printf("%s %d", msg, i);
1616                                 msg = "";
1617                         }
1618                 msg = (set_disable) ? " enable" : "enable";
1619                 for (i = 0; i < RESVD_SET; i++)
1620                         if (!(set_disable & (1<<i))) {
1621                                 printf("%s %d", msg, i);
1622                                 msg = "";
1623                         }
1624                 printf("\n");
1625         } else if (_substrcmp(*av, "swap") == 0) {
1626                 ac--; av++;
1627                 if (ac != 2)
1628                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1629                 rulenum = atoi(av[0]);
1630                 new_set = atoi(av[1]);
1631                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1632                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1633                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1634                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1635                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1636                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1637         } else if (_substrcmp(*av, "move") == 0) {
1638                 ac--; av++;
1639                 if (ac && _substrcmp(*av, "rule") == 0) {
1640                         cmd = 2;
1641                         ac--; av++;
1642                 } else
1643                         cmd = 3;
1644                 if (ac != 3 || _substrcmp(av[1], "to") != 0)
1645                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1646                 rulenum = atoi(av[0]);
1647                 new_set = atoi(av[2]);
1648                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1649                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1650                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1651                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1652                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1653                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1654                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1655         } else if (_substrcmp(*av, "disable") == 0 ||
1656                    _substrcmp(*av, "enable") == 0 ) {
1657                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1658
1659                 ac--; av++;
1660                 masks[0] = masks[1] = 0;
1661
1662                 while (ac) {
1663                         if (isdigit(**av)) {
1664                                 i = atoi(*av);
1665                                 if (i < 0 || i > RESVD_SET)
1666                                         errx(EX_DATAERR,
1667                                             "invalid set number %d\n", i);
1668                                 masks[which] |= (1<<i);
1669                         } else if (_substrcmp(*av, "disable") == 0)
1670                                 which = 0;
1671                         else if (_substrcmp(*av, "enable") == 0)
1672                                 which = 1;
1673                         else
1674                                 errx(EX_DATAERR,
1675                                         "invalid set command %s\n", *av);
1676                         av++; ac--;
1677                 }
1678                 if ( (masks[0] & masks[1]) != 0 )
1679                         errx(EX_DATAERR,
1680                             "cannot enable and disable the same set\n");
1681
1682                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1683                 if (i)
1684                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1685         } else
1686                 errx(EX_USAGE, "invalid set command %s\n", *av);
1687 }
1688
1689 void
1690 ipfw_sysctl_handler(int ac, char *av[], int which)
1691 {
1692         ac--;
1693         av++;
1694
1695         if (ac == 0) {
1696                 warnx("missing keyword to enable/disable\n");
1697         } else if (_substrcmp(*av, "firewall") == 0) {
1698                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1699                     &which, sizeof(which));
1700         } else if (_substrcmp(*av, "one_pass") == 0) {
1701                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1702                     &which, sizeof(which));
1703         } else if (_substrcmp(*av, "debug") == 0) {
1704                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1705                     &which, sizeof(which));
1706         } else if (_substrcmp(*av, "verbose") == 0) {
1707                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1708                     &which, sizeof(which));
1709         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1710                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1711                     &which, sizeof(which));
1712         } else if (_substrcmp(*av, "altq") == 0) {
1713                 altq_set_enabled(which);
1714         } else {
1715                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1716         }
1717 }
1718
1719 void
1720 ipfw_list(int ac, char *av[], int show_counters)
1721 {
1722         struct ip_fw *r;
1723         ipfw_dyn_rule *dynrules = NULL;
1724         ipfw_dyn_rule *d;
1725
1726 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1727         char *lim;
1728         void *data = NULL;
1729         int bcwidth, n, nbytes, pcwidth, width, nstat;
1730         int ndyn = 0;
1731         int exitval = EX_OK;
1732         int lac;
1733         char **lav;
1734         u_long rnum, last;
1735         char *endptr;
1736         int seen = 0;
1737         uint8_t set;
1738         int ocmd = IP_FW_GET;
1739
1740         if (co.do_pipe)
1741                 ocmd = IP_DUMMYNET_GET;
1742         else if (co.do_dynamic)
1743                 ocmd = IP_FW_DYN_GET;
1744
1745         int nalloc = 1024;      /* start somewhere... */
1746
1747         last = 0;
1748
1749         if (co.test_only) {
1750                 fprintf(stderr, "Testing only, list disabled\n");
1751                 return;
1752         }
1753
1754         ac--;
1755         av++;
1756
1757         /* get rules or pipes from kernel, resizing array as necessary */
1758         nbytes = nalloc;
1759
1760         while (nbytes >= nalloc) {
1761                 nalloc = nalloc * 2 + 200;
1762                 nbytes = nalloc;
1763                 data = safe_realloc(data, nbytes);
1764                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1765                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1766                                 co.do_pipe ? "DUMMYNET" : "FW");
1767         }
1768
1769         if (co.do_pipe) {
1770                 ipfw_list_pipes(data, nbytes, ac, av);
1771                 goto done;
1772         }
1773
1774         /*
1775          * Count static rules. They have variable size so we
1776          * need to scan the list to count them.
1777          */
1778         nstat = 0;
1779         r = data;
1780
1781         if (!co.do_dynamic) {
1782         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1783                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1784                     ++nstat, r = NEXT(r) )
1785                 ; /* nothing */
1786         }
1787
1788         /*
1789          * Count dynamic rules. This is easier as they have
1790          * fixed size.
1791          */
1792         if (co.do_dynamic) {
1793                 dynrules = (ipfw_dyn_rule *)r ;
1794                 n = (char *)r - (char *)data;
1795                 ndyn = (nbytes - n) / sizeof *dynrules;
1796         }
1797
1798         /* if showing stats, figure out column widths ahead of time */
1799         bcwidth = pcwidth = 0;
1800         if (show_counters) {
1801                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1802                         /* skip rules from another set */
1803                         if (co.use_set && r->set != co.use_set - 1)
1804                                 continue;
1805
1806                         /* packet counter */
1807                         width = snprintf(NULL, 0, "%llu",
1808                             align_uint64(&r->pcnt));
1809                         if (width > pcwidth)
1810                                 pcwidth = width;
1811
1812                         /* byte counter */
1813                         width = snprintf(NULL, 0, "%llu",
1814                             align_uint64(&r->bcnt));
1815                         if (width > bcwidth)
1816                                 bcwidth = width;
1817                 }
1818         }
1819
1820         if (co.do_dynamic && ndyn) {
1821                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1822                         if (co.use_set) {
1823                                 /* skip rules from another set */
1824                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1825                                       &set, sizeof(uint8_t));
1826                                 if (set != co.use_set - 1)
1827                                         continue;
1828                         }
1829                         width = snprintf(NULL, 0, "%llu",
1830                             align_uint64(&d->pcnt));
1831                         if (width > pcwidth)
1832                                 pcwidth = width;
1833
1834                         width = snprintf(NULL, 0, "%llu",
1835                             align_uint64(&d->bcnt));
1836                         if (width > bcwidth)
1837                                 bcwidth = width;
1838                 }
1839         }
1840
1841         /* if no rule numbers were specified, list all rules */
1842         if (ac == 0) {
1843                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1844                         if (co.use_set && r->set != co.use_set - 1)
1845                                 continue;
1846                         show_ipfw(r, pcwidth, bcwidth);
1847                 }
1848
1849                 if (co.do_dynamic && ndyn) {
1850                         printf("## Dynamic rules (%d):\n", ndyn);
1851                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1852                                 if (co.use_set) {
1853                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1854                                               &set, sizeof(uint8_t));
1855                                         if (set != co.use_set - 1)
1856                                                 continue;
1857                                 }
1858                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1859                 }
1860                 }
1861                 goto done;
1862         }
1863
1864         /* display specific rules requested on command line */
1865
1866         if (!co.do_dynamic) {
1867         for (lac = ac, lav = av; lac != 0; lac--) {
1868                 /* convert command line rule # */
1869                 last = rnum = strtoul(*lav++, &endptr, 10);
1870                 if (*endptr == '-')
1871                         last = strtoul(endptr+1, &endptr, 10);
1872                 if (*endptr) {
1873                         exitval = EX_USAGE;
1874                         warnx("invalid rule number: %s", *(lav - 1));
1875                         continue;
1876                 }
1877                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
1878                         if (r->rulenum > last)
1879                                 break;
1880                         if (co.use_set && r->set != co.use_set - 1)
1881                                 continue;
1882                         if (r->rulenum >= rnum && r->rulenum <= last) {
1883                                 show_ipfw(r, pcwidth, bcwidth);
1884                                 seen = 1;
1885                         }
1886                 }
1887                 if (!seen) {
1888                         /* give precedence to other error(s) */
1889                         if (exitval == EX_OK)
1890                                 exitval = EX_UNAVAILABLE;
1891                         warnx("rule %lu does not exist", rnum);
1892                 }
1893         }
1894         }
1895
1896         if (co.do_dynamic && ndyn) {
1897                 printf("## Dynamic rules:\n");
1898                 for (lac = ac, lav = av; lac != 0; lac--) {
1899                         last = rnum = strtoul(*lav++, &endptr, 10);
1900                         if (*endptr == '-')
1901                                 last = strtoul(endptr+1, &endptr, 10);
1902                         if (*endptr)
1903                                 /* already warned */
1904                                 continue;
1905                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1906                                 uint16_t rulenum;
1907
1908                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
1909                                 if (rulenum > rnum)
1910                                         break;
1911                                 if (co.use_set) {
1912                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1913                                               &set, sizeof(uint8_t));
1914                                         if (set != co.use_set - 1)
1915                                                 continue;
1916                                 }
1917                                 if (r->rulenum >= rnum && r->rulenum <= last)
1918                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1919                         }
1920                 }
1921         }
1922
1923         ac = 0;
1924
1925 done:
1926         free(data);
1927
1928         if (exitval != EX_OK)
1929                 exit(exitval);
1930 #undef NEXT
1931 }
1932
1933 static int
1934 lookup_host (char *host, struct in_addr *ipaddr)
1935 {
1936         struct hostent *he;
1937
1938         if (!inet_aton(host, ipaddr)) {
1939                 if ((he = gethostbyname(host)) == NULL)
1940                         return(-1);
1941                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1942         }
1943         return(0);
1944 }
1945
1946 /*
1947  * fills the addr and mask fields in the instruction as appropriate from av.
1948  * Update length as appropriate.
1949  * The following formats are allowed:
1950  *      me      returns O_IP_*_ME
1951  *      1.2.3.4         single IP address
1952  *      1.2.3.4:5.6.7.8 address:mask
1953  *      1.2.3.4/24      address/mask
1954  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1955  * We can have multiple comma-separated address/mask entries.
1956  */
1957 static void
1958 fill_ip(ipfw_insn_ip *cmd, char *av)
1959 {
1960         int len = 0;
1961         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
1962
1963         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1964
1965         if (_substrcmp(av, "any") == 0)
1966                 return;
1967
1968         if (_substrcmp(av, "me") == 0) {
1969                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1970                 return;
1971         }
1972
1973         if (strncmp(av, "table(", 6) == 0) {
1974                 char *p = strchr(av + 6, ',');
1975
1976                 if (p)
1977                         *p++ = '\0';
1978                 cmd->o.opcode = O_IP_DST_LOOKUP;
1979                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
1980                 if (p) {
1981                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1982                         d[0] = strtoul(p, NULL, 0);
1983                 } else
1984                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1985                 return;
1986         }
1987
1988     while (av) {
1989         /*
1990          * After the address we can have '/' or ':' indicating a mask,
1991          * ',' indicating another address follows, '{' indicating a
1992          * set of addresses of unspecified size.
1993          */
1994         char *t = NULL, *p = strpbrk(av, "/:,{");
1995         int masklen;
1996         char md, nd = '\0';
1997
1998         if (p) {
1999                 md = *p;
2000                 *p++ = '\0';
2001                 if ((t = strpbrk(p, ",{")) != NULL) {
2002                         nd = *t;
2003                         *t = '\0';
2004                 }
2005         } else
2006                 md = '\0';
2007
2008         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2009                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2010         switch (md) {
2011         case ':':
2012                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2013                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2014                 break;
2015         case '/':
2016                 masklen = atoi(p);
2017                 if (masklen == 0)
2018                         d[1] = htonl(0);        /* mask */
2019                 else if (masklen > 32)
2020                         errx(EX_DATAERR, "bad width ``%s''", p);
2021                 else
2022                         d[1] = htonl(~0 << (32 - masklen));
2023                 break;
2024         case '{':       /* no mask, assume /24 and put back the '{' */
2025                 d[1] = htonl(~0 << (32 - 24));
2026                 *(--p) = md;
2027                 break;
2028
2029         case ',':       /* single address plus continuation */
2030                 *(--p) = md;
2031                 /* FALLTHROUGH */
2032         case 0:         /* initialization value */
2033         default:
2034                 d[1] = htonl(~0);       /* force /32 */
2035                 break;
2036         }
2037         d[0] &= d[1];           /* mask base address with mask */
2038         if (t)
2039                 *t = nd;
2040         /* find next separator */
2041         if (p)
2042                 p = strpbrk(p, ",{");
2043         if (p && *p == '{') {
2044                 /*
2045                  * We have a set of addresses. They are stored as follows:
2046                  *   arg1       is the set size (powers of 2, 2..256)
2047                  *   addr       is the base address IN HOST FORMAT
2048                  *   mask..     is an array of arg1 bits (rounded up to
2049                  *              the next multiple of 32) with bits set
2050                  *              for each host in the map.
2051                  */
2052                 uint32_t *map = (uint32_t *)&cmd->mask;
2053                 int low, high;
2054                 int i = contigmask((uint8_t *)&(d[1]), 32);
2055
2056                 if (len > 0)
2057                         errx(EX_DATAERR, "address set cannot be in a list");
2058                 if (i < 24 || i > 31)
2059                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2060                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2061                 d[0] = ntohl(d[0]);             /* base addr in host format */
2062                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2063                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2064                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2065                         map[i] = 0;     /* clear map */
2066
2067                 av = p + 1;
2068                 low = d[0] & 0xff;
2069                 high = low + cmd->o.arg1 - 1;
2070                 /*
2071                  * Here, i stores the previous value when we specify a range
2072                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2073                  * have no previous value.
2074                  */
2075                 i = -1; /* previous value in a range */
2076                 while (isdigit(*av)) {
2077                         char *s;
2078                         int a = strtol(av, &s, 0);
2079
2080                         if (s == av) { /* no parameter */
2081                             if (*av != '}')
2082                                 errx(EX_DATAERR, "set not closed\n");
2083                             if (i != -1)
2084                                 errx(EX_DATAERR, "incomplete range %d-", i);
2085                             break;
2086                         }
2087                         if (a < low || a > high)
2088                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2089                                 a, low, high);
2090                         a -= low;
2091                         if (i == -1)    /* no previous in range */
2092                             i = a;
2093                         else {          /* check that range is valid */
2094                             if (i > a)
2095                                 errx(EX_DATAERR, "invalid range %d-%d",
2096                                         i+low, a+low);
2097                             if (*s == '-')
2098                                 errx(EX_DATAERR, "double '-' in range");
2099                         }
2100                         for (; i <= a; i++)
2101                             map[i/32] |= 1<<(i & 31);
2102                         i = -1;
2103                         if (*s == '-')
2104                             i = a;
2105                         else if (*s == '}')
2106                             break;
2107                         av = s+1;
2108                 }
2109                 return;
2110         }
2111         av = p;
2112         if (av)                 /* then *av must be a ',' */
2113                 av++;
2114
2115         /* Check this entry */
2116         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2117                 /*
2118                  * 'any' turns the entire list into a NOP.
2119                  * 'not any' never matches, so it is removed from the
2120                  * list unless it is the only item, in which case we
2121                  * report an error.
2122                  */
2123                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2124                         if (av == NULL && len == 0) /* only this entry */
2125                                 errx(EX_DATAERR, "not any never matches");
2126                 }
2127                 /* else do nothing and skip this entry */
2128                 return;
2129         }
2130         /* A single IP can be stored in an optimized format */
2131         if (d[1] == ~0 && av == NULL && len == 0) {
2132                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2133                 return;
2134         }
2135         len += 2;       /* two words... */
2136         d += 2;
2137     } /* end while */
2138     if (len + 1 > F_LEN_MASK)
2139         errx(EX_DATAERR, "address list too long");
2140     cmd->o.len |= len+1;
2141 }
2142
2143
2144 /* n2mask sets n bits of the mask */
2145 void
2146 n2mask(struct in6_addr *mask, int n)
2147 {
2148         static int      minimask[9] =
2149             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2150         u_char          *p;
2151
2152         memset(mask, 0, sizeof(struct in6_addr));
2153         p = (u_char *) mask;
2154         for (; n > 0; p++, n -= 8) {
2155                 if (n >= 8)
2156                         *p = 0xff;
2157                 else
2158                         *p = minimask[n];
2159         }
2160         return;
2161 }
2162
2163
2164 /*
2165  * helper function to process a set of flags and set bits in the
2166  * appropriate masks.
2167  */
2168 static void
2169 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2170         struct _s_x *flags, char *p)
2171 {
2172         uint8_t set=0, clear=0;
2173
2174         while (p && *p) {
2175                 char *q;        /* points to the separator */
2176                 int val;
2177                 uint8_t *which; /* mask we are working on */
2178
2179                 if (*p == '!') {
2180                         p++;
2181                         which = &clear;
2182                 } else
2183                         which = &set;
2184                 q = strchr(p, ',');
2185                 if (q)
2186                         *q++ = '\0';
2187                 val = match_token(flags, p);
2188                 if (val <= 0)
2189                         errx(EX_DATAERR, "invalid flag %s", p);
2190                 *which |= (uint8_t)val;
2191                 p = q;
2192         }
2193         cmd->opcode = opcode;
2194         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2195         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2196 }
2197
2198
2199 void
2200 ipfw_delete(int ac, char *av[])
2201 {
2202         uint32_t rulenum;
2203         int i;
2204         int exitval = EX_OK;
2205         int do_set = 0;
2206
2207
2208         av++; ac--;
2209         NEED1("missing rule specification");
2210         if (ac > 0 && _substrcmp(*av, "set") == 0) {
2211                 /* Do not allow using the following syntax:
2212                  *      ipfw set N delete set M
2213                  */
2214                 if (co.use_set)
2215                         errx(EX_DATAERR, "invalid syntax");
2216                 do_set = 1;     /* delete set */
2217                 ac--; av++;
2218         }
2219
2220         /* Rule number */
2221         while (ac && isdigit(**av)) {
2222                 i = atoi(*av); av++; ac--;
2223                 if (co.do_nat) {
2224                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2225                         if (exitval) {
2226                                 exitval = EX_UNAVAILABLE;
2227                                 warn("rule %u not available", i);
2228                         }
2229                 } else if (co.do_pipe) {
2230                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2231                 } else {
2232                         if (co.use_set)
2233                                 rulenum = (i & 0xffff) | (5 << 24) |
2234                                     ((co.use_set - 1) << 16);
2235                         else
2236                         rulenum =  (i & 0xffff) | (do_set << 24);
2237                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2238                         if (i) {
2239                                 exitval = EX_UNAVAILABLE;
2240                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2241                                     rulenum);
2242                         }
2243                 }
2244         }
2245         if (exitval != EX_OK)
2246                 exit(exitval);
2247 }
2248
2249
2250 /*
2251  * fill the interface structure. We do not check the name as we can
2252  * create interfaces dynamically, so checking them at insert time
2253  * makes relatively little sense.
2254  * Interface names containing '*', '?', or '[' are assumed to be shell
2255  * patterns which match interfaces.
2256  */
2257 static void
2258 fill_iface(ipfw_insn_if *cmd, char *arg)
2259 {
2260         cmd->name[0] = '\0';
2261         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2262
2263         /* Parse the interface or address */
2264         if (strcmp(arg, "any") == 0)
2265                 cmd->o.len = 0;         /* effectively ignore this command */
2266         else if (!isdigit(*arg)) {
2267                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2268                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2269         } else if (!inet_aton(arg, &cmd->p.ip))
2270                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2271 }
2272
2273 static void
2274 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2275 {
2276         int i, l;
2277         char *ap, *ptr, *optr;
2278         struct ether_addr *mac;
2279         const char *macset = "0123456789abcdefABCDEF:";
2280
2281         if (strcmp(p, "any") == 0) {
2282                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2283                         addr[i] = mask[i] = 0;
2284                 return;
2285         }
2286
2287         optr = ptr = strdup(p);
2288         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2289                 l = strlen(ap);
2290                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2291                         errx(EX_DATAERR, "Incorrect MAC address");
2292                 bcopy(mac, addr, ETHER_ADDR_LEN);
2293         } else
2294                 errx(EX_DATAERR, "Incorrect MAC address");
2295
2296         if (ptr != NULL) { /* we have mask? */
2297                 if (p[ptr - optr - 1] == '/') { /* mask len */
2298                         l = strtol(ptr, &ap, 10);
2299                         if (*ap != 0 || l > ETHER_ADDR_LEN * 8 || l < 0)
2300                                 errx(EX_DATAERR, "Incorrect mask length");
2301                         for (i = 0; l > 0 && i < ETHER_ADDR_LEN; l -= 8, i++)
2302                                 mask[i] = (l >= 8) ? 0xff: (~0) << (8 - l);
2303                 } else { /* mask */
2304                         l = strlen(ptr);
2305                         if (strspn(ptr, macset) != l ||
2306                             (mac = ether_aton(ptr)) == NULL)
2307                                 errx(EX_DATAERR, "Incorrect mask");
2308                         bcopy(mac, mask, ETHER_ADDR_LEN);
2309                 }
2310         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2311                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2312                         mask[i] = 0xff;
2313         }
2314         for (i = 0; i < ETHER_ADDR_LEN; i++)
2315                 addr[i] &= mask[i];
2316
2317         free(optr);
2318 }
2319
2320 /*
2321  * helper function, updates the pointer to cmd with the length
2322  * of the current command, and also cleans up the first word of
2323  * the new command in case it has been clobbered before.
2324  */
2325 static ipfw_insn *
2326 next_cmd(ipfw_insn *cmd)
2327 {
2328         cmd += F_LEN(cmd);
2329         bzero(cmd, sizeof(*cmd));
2330         return cmd;
2331 }
2332
2333 /*
2334  * Takes arguments and copies them into a comment
2335  */
2336 static void
2337 fill_comment(ipfw_insn *cmd, int ac, char **av)
2338 {
2339         int i, l;
2340         char *p = (char *)(cmd + 1);
2341
2342         cmd->opcode = O_NOP;
2343         cmd->len =  (cmd->len & (F_NOT | F_OR));
2344
2345         /* Compute length of comment string. */
2346         for (i = 0, l = 0; i < ac; i++)
2347                 l += strlen(av[i]) + 1;
2348         if (l == 0)
2349                 return;
2350         if (l > 84)
2351                 errx(EX_DATAERR,
2352                     "comment too long (max 80 chars)");
2353         l = 1 + (l+3)/4;
2354         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2355         for (i = 0; i < ac; i++) {
2356                 strcpy(p, av[i]);
2357                 p += strlen(av[i]);
2358                 *p++ = ' ';
2359         }
2360         *(--p) = '\0';
2361 }
2362
2363 /*
2364  * A function to fill simple commands of size 1.
2365  * Existing flags are preserved.
2366  */
2367 static void
2368 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2369 {
2370         cmd->opcode = opcode;
2371         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2372         cmd->arg1 = arg;
2373 }
2374
2375 /*
2376  * Fetch and add the MAC address and type, with masks. This generates one or
2377  * two microinstructions, and returns the pointer to the last one.
2378  */
2379 static ipfw_insn *
2380 add_mac(ipfw_insn *cmd, int ac, char *av[])
2381 {
2382         ipfw_insn_mac *mac;
2383
2384         if (ac < 2)
2385                 errx(EX_DATAERR, "MAC dst src");
2386
2387         cmd->opcode = O_MACADDR2;
2388         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2389
2390         mac = (ipfw_insn_mac *)cmd;
2391         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2392         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2393             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2394         return cmd;
2395 }
2396
2397 static ipfw_insn *
2398 add_mactype(ipfw_insn *cmd, int ac, char *av)
2399 {
2400         if (ac < 1)
2401                 errx(EX_DATAERR, "missing MAC type");
2402         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2403                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2404                 cmd->opcode = O_MAC_TYPE;
2405                 return cmd;
2406         } else
2407                 return NULL;
2408 }
2409
2410 static ipfw_insn *
2411 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2412 {
2413         struct protoent *pe;
2414         char *ep;
2415         int proto;
2416
2417         proto = strtol(av, &ep, 10);
2418         if (*ep != '\0' || proto <= 0) {
2419                 if ((pe = getprotobyname(av)) == NULL)
2420                         return NULL;
2421                 proto = pe->p_proto;
2422         }
2423
2424         fill_cmd(cmd, O_PROTO, 0, proto);
2425         *protop = proto;
2426         return cmd;
2427 }
2428
2429 static ipfw_insn *
2430 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2431 {
2432         u_char proto = IPPROTO_IP;
2433
2434         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2435                 ; /* do not set O_IP4 nor O_IP6 */
2436         else if (strcmp(av, "ip4") == 0)
2437                 /* explicit "just IPv4" rule */
2438                 fill_cmd(cmd, O_IP4, 0, 0);
2439         else if (strcmp(av, "ip6") == 0) {
2440                 /* explicit "just IPv6" rule */
2441                 proto = IPPROTO_IPV6;
2442                 fill_cmd(cmd, O_IP6, 0, 0);
2443         } else
2444                 return add_proto0(cmd, av, protop);
2445
2446         *protop = proto;
2447         return cmd;
2448 }
2449
2450 static ipfw_insn *
2451 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2452 {
2453         u_char proto = IPPROTO_IP;
2454
2455         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2456                 ; /* do not set O_IP4 nor O_IP6 */
2457         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2458                 /* explicit "just IPv4" rule */
2459                 fill_cmd(cmd, O_IP4, 0, 0);
2460         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2461                 /* explicit "just IPv6" rule */
2462                 proto = IPPROTO_IPV6;
2463                 fill_cmd(cmd, O_IP6, 0, 0);
2464         } else
2465                 return add_proto0(cmd, av, protop);
2466
2467         *protop = proto;
2468         return cmd;
2469 }
2470
2471 static ipfw_insn *
2472 add_srcip(ipfw_insn *cmd, char *av)
2473 {
2474         fill_ip((ipfw_insn_ip *)cmd, av);
2475         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2476                 cmd->opcode = O_IP_SRC_SET;
2477         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2478                 cmd->opcode = O_IP_SRC_LOOKUP;
2479         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2480                 cmd->opcode = O_IP_SRC_ME;
2481         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2482                 cmd->opcode = O_IP_SRC;
2483         else                                                    /* addr/mask */
2484                 cmd->opcode = O_IP_SRC_MASK;
2485         return cmd;
2486 }
2487
2488 static ipfw_insn *
2489 add_dstip(ipfw_insn *cmd, char *av)
2490 {
2491         fill_ip((ipfw_insn_ip *)cmd, av);
2492         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2493                 ;
2494         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2495                 ;
2496         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2497                 cmd->opcode = O_IP_DST_ME;
2498         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2499                 cmd->opcode = O_IP_DST;
2500         else                                                    /* addr/mask */
2501                 cmd->opcode = O_IP_DST_MASK;
2502         return cmd;
2503 }
2504
2505 static ipfw_insn *
2506 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2507 {
2508         if (_substrcmp(av, "any") == 0) {
2509                 return NULL;
2510         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2511                 /* XXX todo: check that we have a protocol with ports */
2512                 cmd->opcode = opcode;
2513                 return cmd;
2514         }
2515         return NULL;
2516 }
2517
2518 static ipfw_insn *
2519 add_src(ipfw_insn *cmd, char *av, u_char proto)
2520 {
2521         struct in6_addr a;
2522         char *host, *ch;
2523         ipfw_insn *ret = NULL;
2524
2525         if ((host = strdup(av)) == NULL)
2526                 return NULL;
2527         if ((ch = strrchr(host, '/')) != NULL)
2528                 *ch = '\0';
2529
2530         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2531             inet_pton(AF_INET6, host, &a))
2532                 ret = add_srcip6(cmd, av);
2533         /* XXX: should check for IPv4, not !IPv6 */
2534         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2535             !inet_pton(AF_INET6, host, &a)))
2536                 ret = add_srcip(cmd, av);
2537         if (ret == NULL && strcmp(av, "any") != 0)
2538                 ret = cmd;
2539
2540         free(host);
2541         return ret;
2542 }
2543
2544 static ipfw_insn *
2545 add_dst(ipfw_insn *cmd, char *av, u_char proto)
2546 {
2547         struct in6_addr a;
2548         char *host, *ch;
2549         ipfw_insn *ret = NULL;
2550
2551         if ((host = strdup(av)) == NULL)
2552                 return NULL;
2553         if ((ch = strrchr(host, '/')) != NULL)
2554                 *ch = '\0';
2555
2556         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2557             inet_pton(AF_INET6, host, &a))
2558                 ret = add_dstip6(cmd, av);
2559         /* XXX: should check for IPv4, not !IPv6 */
2560         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2561             !inet_pton(AF_INET6, host, &a)))
2562                 ret = add_dstip(cmd, av);
2563         if (ret == NULL && strcmp(av, "any") != 0)
2564                 ret = cmd;
2565
2566         free(host);
2567         return ret;
2568 }
2569
2570 /*
2571  * Parse arguments and assemble the microinstructions which make up a rule.
2572  * Rules are added into the 'rulebuf' and then copied in the correct order
2573  * into the actual rule.
2574  *
2575  * The syntax for a rule starts with the action, followed by
2576  * optional action parameters, and the various match patterns.
2577  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2578  * (generated if the rule includes a keep-state option), then the
2579  * various match patterns, log/altq actions, and the actual action.
2580  *
2581  */
2582 void
2583 ipfw_add(int ac, char *av[])
2584 {
2585         /*
2586          * rules are added into the 'rulebuf' and then copied in
2587          * the correct order into the actual rule.
2588          * Some things that need to go out of order (prob, action etc.)
2589          * go into actbuf[].
2590          */
2591         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2592
2593         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2594         ipfw_insn *first_cmd;   /* first match pattern */
2595
2596         struct ip_fw *rule;
2597
2598         /*
2599          * various flags used to record that we entered some fields.
2600          */
2601         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2602         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2603         size_t len;
2604
2605         int i;
2606
2607         int open_par = 0;       /* open parenthesis ( */
2608
2609         /* proto is here because it is used to fetch ports */
2610         u_char proto = IPPROTO_IP;      /* default protocol */
2611
2612         double match_prob = 1; /* match probability, default is always match */
2613
2614         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2615         bzero(cmdbuf, sizeof(cmdbuf));
2616         bzero(rulebuf, sizeof(rulebuf));
2617
2618         rule = (struct ip_fw *)rulebuf;
2619         cmd = (ipfw_insn *)cmdbuf;
2620         action = (ipfw_insn *)actbuf;
2621
2622         av++; ac--;
2623
2624         /* [rule N]     -- Rule number optional */
2625         if (ac && isdigit(**av)) {
2626                 rule->rulenum = atoi(*av);
2627                 av++;
2628                 ac--;
2629         }
2630
2631         /* [set N]      -- set number (0..RESVD_SET), optional */
2632         if (ac > 1 && _substrcmp(*av, "set") == 0) {
2633                 int set = strtoul(av[1], NULL, 10);
2634                 if (set < 0 || set > RESVD_SET)
2635                         errx(EX_DATAERR, "illegal set %s", av[1]);
2636                 rule->set = set;
2637                 av += 2; ac -= 2;
2638         }
2639
2640         /* [prob D]     -- match probability, optional */
2641         if (ac > 1 && _substrcmp(*av, "prob") == 0) {
2642                 match_prob = strtod(av[1], NULL);
2643
2644                 if (match_prob <= 0 || match_prob > 1)
2645                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2646                 av += 2; ac -= 2;
2647         }
2648
2649         /* action       -- mandatory */
2650         NEED1("missing action");
2651         i = match_token(rule_actions, *av);
2652         ac--; av++;
2653         action->len = 1;        /* default */
2654         switch(i) {
2655         case TOK_CHECKSTATE:
2656                 have_state = action;
2657                 action->opcode = O_CHECK_STATE;
2658                 break;
2659
2660         case TOK_ACCEPT:
2661                 action->opcode = O_ACCEPT;
2662                 break;
2663
2664         case TOK_DENY:
2665                 action->opcode = O_DENY;
2666                 action->arg1 = 0;
2667                 break;
2668
2669         case TOK_REJECT:
2670                 action->opcode = O_REJECT;
2671                 action->arg1 = ICMP_UNREACH_HOST;
2672                 break;
2673
2674         case TOK_RESET:
2675                 action->opcode = O_REJECT;
2676                 action->arg1 = ICMP_REJECT_RST;
2677                 break;
2678
2679         case TOK_RESET6:
2680                 action->opcode = O_UNREACH6;
2681                 action->arg1 = ICMP6_UNREACH_RST;
2682                 break;
2683
2684         case TOK_UNREACH:
2685                 action->opcode = O_REJECT;
2686                 NEED1("missing reject code");
2687                 fill_reject_code(&action->arg1, *av);
2688                 ac--; av++;
2689                 break;
2690
2691         case TOK_UNREACH6:
2692                 action->opcode = O_UNREACH6;
2693                 NEED1("missing unreach code");
2694                 fill_unreach6_code(&action->arg1, *av);
2695                 ac--; av++;
2696                 break;
2697
2698         case TOK_COUNT:
2699                 action->opcode = O_COUNT;
2700                 break;
2701
2702         case TOK_NAT:
2703                 action->opcode = O_NAT;
2704                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2705                 goto chkarg;
2706
2707         case TOK_QUEUE:
2708                 action->opcode = O_QUEUE;
2709                 goto chkarg;
2710         case TOK_PIPE:
2711                 action->opcode = O_PIPE;
2712                 goto chkarg;
2713         case TOK_SKIPTO:
2714                 action->opcode = O_SKIPTO;
2715                 goto chkarg;
2716         case TOK_NETGRAPH:
2717                 action->opcode = O_NETGRAPH;
2718                 goto chkarg;
2719         case TOK_NGTEE:
2720                 action->opcode = O_NGTEE;
2721                 goto chkarg;
2722         case TOK_DIVERT:
2723                 action->opcode = O_DIVERT;
2724                 goto chkarg;
2725         case TOK_TEE:
2726                 action->opcode = O_TEE;
2727 chkarg:
2728                 if (!ac)
2729                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2730                 if (isdigit(**av)) {
2731                         action->arg1 = strtoul(*av, NULL, 10);
2732                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2733                                 errx(EX_DATAERR, "illegal argument for %s",
2734                                     *(av - 1));
2735                 } else if (_substrcmp(*av, "tablearg") == 0) {
2736                         action->arg1 = IP_FW_TABLEARG;
2737                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2738                         struct servent *s;
2739                         setservent(1);
2740                         s = getservbyname(av[0], "divert");
2741                         if (s != NULL)
2742                                 action->arg1 = ntohs(s->s_port);
2743                         else
2744                                 errx(EX_DATAERR, "illegal divert/tee port");
2745                 } else
2746                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2747                 ac--; av++;
2748                 break;
2749
2750         case TOK_FORWARD: {
2751                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2752                 char *s, *end;
2753
2754                 NEED1("missing forward address[:port]");
2755
2756                 action->opcode = O_FORWARD_IP;
2757                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2758
2759                 /*
2760                  * In the kernel we assume AF_INET and use only
2761                  * sin_port and sin_addr.
2762                  */
2763                 p->sa.sin_family = AF_INET;
2764                 p->sa.sin_port = 0;
2765                 /*
2766                  * locate the address-port separator (':' or ',')
2767                  */
2768                 s = strchr(*av, ':');
2769                 if (s == NULL)
2770                         s = strchr(*av, ',');
2771                 if (s != NULL) {
2772                         *(s++) = '\0';
2773                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2774                         if (s == end)
2775                                 errx(EX_DATAERR,
2776                                     "illegal forwarding port ``%s''", s);
2777                         p->sa.sin_port = (u_short)i;
2778                 }
2779                 if (_substrcmp(*av, "tablearg") == 0)
2780                         p->sa.sin_addr.s_addr = INADDR_ANY;
2781                 else
2782                         lookup_host(*av, &(p->sa.sin_addr));
2783                 ac--; av++;
2784                 break;
2785             }
2786         case TOK_COMMENT:
2787                 /* pretend it is a 'count' rule followed by the comment */
2788                 action->opcode = O_COUNT;
2789                 ac++; av--;     /* go back... */
2790                 break;
2791
2792         case TOK_SETFIB:
2793             {
2794                 int numfibs;
2795                 size_t intsize = sizeof(int);
2796
2797                 action->opcode = O_SETFIB;
2798                 NEED1("missing fib number");
2799                 action->arg1 = strtoul(*av, NULL, 10);
2800                 if (sysctlbyname("net.fibs", &numfibs, &intsize, NULL, 0) == -1)
2801                         errx(EX_DATAERR, "fibs not suported.\n");
2802                 if (action->arg1 >= numfibs)  /* Temporary */
2803                         errx(EX_DATAERR, "fib too large.\n");
2804                 ac--; av++;
2805                 break;
2806             }
2807
2808         case TOK_REASS:
2809                 action->opcode = O_REASS;
2810                 break;
2811
2812         default:
2813                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2814         }
2815         action = next_cmd(action);
2816
2817         /*
2818          * [altq queuename] -- altq tag, optional
2819          * [log [logamount N]]  -- log, optional
2820          *
2821          * If they exist, it go first in the cmdbuf, but then it is
2822          * skipped in the copy section to the end of the buffer.
2823          */
2824         while (ac != 0 && (i = match_token(rule_action_params, *av)) != -1) {
2825                 ac--; av++;
2826                 switch (i) {
2827                 case TOK_LOG:
2828                     {
2829                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2830                         int l;
2831
2832                         if (have_log)
2833                                 errx(EX_DATAERR,
2834                                     "log cannot be specified more than once");
2835                         have_log = (ipfw_insn *)c;
2836                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
2837                         cmd->opcode = O_LOG;
2838                         if (ac && _substrcmp(*av, "logamount") == 0) {
2839                                 ac--; av++;
2840                                 NEED1("logamount requires argument");
2841                                 l = atoi(*av);
2842                                 if (l < 0)
2843                                         errx(EX_DATAERR,
2844                                             "logamount must be positive");
2845                                 c->max_log = l;
2846                                 ac--; av++;
2847                         } else {
2848                                 len = sizeof(c->max_log);
2849                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
2850                                     &c->max_log, &len, NULL, 0) == -1)
2851                                         errx(1, "sysctlbyname(\"%s\")",
2852                                             "net.inet.ip.fw.verbose_limit");
2853                         }
2854                     }
2855                         break;
2856
2857                 case TOK_ALTQ:
2858                     {
2859                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
2860
2861                         NEED1("missing altq queue name");
2862                         if (have_altq)
2863                                 errx(EX_DATAERR,
2864                                     "altq cannot be specified more than once");
2865                         have_altq = (ipfw_insn *)a;
2866                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
2867                         cmd->opcode = O_ALTQ;
2868                         a->qid = altq_name_to_qid(*av);
2869                         ac--; av++;
2870                     }
2871                         break;
2872
2873                 case TOK_TAG:
2874                 case TOK_UNTAG: {
2875                         uint16_t tag;
2876
2877                         if (have_tag)
2878                                 errx(EX_USAGE, "tag and untag cannot be "
2879                                     "specified more than once");
2880                         GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1, i,
2881                            rule_action_params);
2882                         have_tag = cmd;
2883                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
2884                         ac--; av++;
2885                         break;
2886                 }
2887
2888                 default:
2889                         abort();
2890                 }
2891                 cmd = next_cmd(cmd);
2892         }
2893
2894         if (have_state) /* must be a check-state, we are done */
2895                 goto done;
2896
2897 #define OR_START(target)                                        \
2898         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2899                 if (open_par)                                   \
2900                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2901                 prev = NULL;                                    \
2902                 open_par = 1;                                   \
2903                 if ( (av[0])[1] == '\0') {                      \
2904                         ac--; av++;                             \
2905                 } else                                          \
2906                         (*av)++;                                \
2907         }                                                       \
2908         target:                                                 \
2909
2910
2911 #define CLOSE_PAR                                               \
2912         if (open_par) {                                         \
2913                 if (ac && (                                     \
2914                     strcmp(*av, ")") == 0 ||                    \
2915                     strcmp(*av, "}") == 0)) {                   \
2916                         prev = NULL;                            \
2917                         open_par = 0;                           \
2918                         ac--; av++;                             \
2919                 } else                                          \
2920                         errx(EX_USAGE, "missing \")\"\n");      \
2921         }
2922
2923 #define NOT_BLOCK                                               \
2924         if (ac && _substrcmp(*av, "not") == 0) {                \
2925                 if (cmd->len & F_NOT)                           \
2926                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2927                 cmd->len |= F_NOT;                              \
2928                 ac--; av++;                                     \
2929         }
2930
2931 #define OR_BLOCK(target)                                        \
2932         if (ac && _substrcmp(*av, "or") == 0) {         \
2933                 if (prev == NULL || open_par == 0)              \
2934                         errx(EX_DATAERR, "invalid OR block");   \
2935                 prev->len |= F_OR;                              \
2936                 ac--; av++;                                     \
2937                 goto target;                                    \
2938         }                                                       \
2939         CLOSE_PAR;
2940
2941         first_cmd = cmd;
2942
2943 #if 0
2944         /*
2945          * MAC addresses, optional.
2946          * If we have this, we skip the part "proto from src to dst"
2947          * and jump straight to the option parsing.
2948          */
2949         NOT_BLOCK;
2950         NEED1("missing protocol");
2951         if (_substrcmp(*av, "MAC") == 0 ||
2952             _substrcmp(*av, "mac") == 0) {
2953                 ac--; av++;     /* the "MAC" keyword */
2954                 add_mac(cmd, ac, av); /* exits in case of errors */
2955                 cmd = next_cmd(cmd);
2956                 ac -= 2; av += 2;       /* dst-mac and src-mac */
2957                 NOT_BLOCK;
2958                 NEED1("missing mac type");
2959                 if (add_mactype(cmd, ac, av[0]))
2960                         cmd = next_cmd(cmd);
2961                 ac--; av++;     /* any or mac-type */
2962                 goto read_options;
2963         }
2964 #endif
2965
2966         /*
2967          * protocol, mandatory
2968          */
2969     OR_START(get_proto);
2970         NOT_BLOCK;
2971         NEED1("missing protocol");
2972         if (add_proto_compat(cmd, *av, &proto)) {
2973                 av++; ac--;
2974                 if (F_LEN(cmd) != 0) {
2975                         prev = cmd;
2976                         cmd = next_cmd(cmd);
2977                 }
2978         } else if (first_cmd != cmd) {
2979                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2980         } else
2981                 goto read_options;
2982     OR_BLOCK(get_proto);
2983
2984         /*
2985          * "from", mandatory
2986          */
2987         if (!ac || _substrcmp(*av, "from") != 0)
2988                 errx(EX_USAGE, "missing ``from''");
2989         ac--; av++;
2990
2991         /*
2992          * source IP, mandatory
2993          */
2994     OR_START(source_ip);
2995         NOT_BLOCK;      /* optional "not" */
2996         NEED1("missing source address");
2997         if (add_src(cmd, *av, proto)) {
2998                 ac--; av++;
2999                 if (F_LEN(cmd) != 0) {  /* ! any */
3000                         prev = cmd;
3001                         cmd = next_cmd(cmd);
3002                 }
3003         } else
3004                 errx(EX_USAGE, "bad source address %s", *av);
3005     OR_BLOCK(source_ip);
3006
3007         /*
3008          * source ports, optional
3009          */
3010         NOT_BLOCK;      /* optional "not" */
3011         if (ac) {
3012                 if (_substrcmp(*av, "any") == 0 ||
3013                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3014                         ac--; av++;
3015                         if (F_LEN(cmd) != 0)
3016                                 cmd = next_cmd(cmd);
3017                 }
3018         }
3019
3020         /*
3021          * "to", mandatory
3022          */
3023         if (!ac || _substrcmp(*av, "to") != 0)
3024                 errx(EX_USAGE, "missing ``to''");
3025         av++; ac--;
3026
3027         /*
3028          * destination, mandatory
3029          */
3030     OR_START(dest_ip);
3031         NOT_BLOCK;      /* optional "not" */
3032         NEED1("missing dst address");
3033         if (add_dst(cmd, *av, proto)) {
3034                 ac--; av++;
3035                 if (F_LEN(cmd) != 0) {  /* ! any */
3036                         prev = cmd;
3037                         cmd = next_cmd(cmd);
3038                 }
3039         } else
3040                 errx( EX_USAGE, "bad destination address %s", *av);
3041     OR_BLOCK(dest_ip);
3042
3043         /*
3044          * dest. ports, optional
3045          */
3046         NOT_BLOCK;      /* optional "not" */
3047         if (ac) {
3048                 if (_substrcmp(*av, "any") == 0 ||
3049                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3050                         ac--; av++;
3051                         if (F_LEN(cmd) != 0)
3052                                 cmd = next_cmd(cmd);
3053                 }
3054         }
3055
3056 read_options:
3057         if (ac && first_cmd == cmd) {
3058                 /*
3059                  * nothing specified so far, store in the rule to ease
3060                  * printout later.
3061                  */
3062                  rule->_pad = 1;
3063         }
3064         prev = NULL;
3065         while (ac) {
3066                 char *s;
3067                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3068
3069                 s = *av;
3070                 cmd32 = (ipfw_insn_u32 *)cmd;
3071
3072                 if (*s == '!') {        /* alternate syntax for NOT */
3073                         if (cmd->len & F_NOT)
3074                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3075                         cmd->len = F_NOT;
3076                         s++;
3077                 }
3078                 i = match_token(rule_options, s);
3079                 ac--; av++;
3080                 switch(i) {
3081                 case TOK_NOT:
3082                         if (cmd->len & F_NOT)
3083                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3084                         cmd->len = F_NOT;
3085                         break;
3086
3087                 case TOK_OR:
3088                         if (open_par == 0 || prev == NULL)
3089                                 errx(EX_USAGE, "invalid \"or\" block\n");
3090                         prev->len |= F_OR;
3091                         break;
3092
3093                 case TOK_STARTBRACE:
3094                         if (open_par)
3095                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3096                         open_par = 1;
3097                         break;
3098
3099                 case TOK_ENDBRACE:
3100                         if (!open_par)
3101                                 errx(EX_USAGE, "+missing \")\"\n");
3102                         open_par = 0;
3103                         prev = NULL;
3104                         break;
3105
3106                 case TOK_IN:
3107                         fill_cmd(cmd, O_IN, 0, 0);
3108                         break;
3109
3110                 case TOK_OUT:
3111                         cmd->len ^= F_NOT; /* toggle F_NOT */
3112                         fill_cmd(cmd, O_IN, 0, 0);
3113                         break;
3114
3115                 case TOK_DIVERTED:
3116                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3117                         break;
3118
3119                 case TOK_DIVERTEDLOOPBACK:
3120                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3121                         break;
3122
3123                 case TOK_DIVERTEDOUTPUT:
3124                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3125                         break;
3126
3127                 case TOK_FRAG:
3128                         fill_cmd(cmd, O_FRAG, 0, 0);
3129                         break;
3130
3131                 case TOK_LAYER2:
3132                         fill_cmd(cmd, O_LAYER2, 0, 0);
3133                         break;
3134
3135                 case TOK_XMIT:
3136                 case TOK_RECV:
3137                 case TOK_VIA:
3138                         NEED1("recv, xmit, via require interface name"
3139                                 " or address");
3140                         fill_iface((ipfw_insn_if *)cmd, av[0]);
3141                         ac--; av++;
3142                         if (F_LEN(cmd) == 0)    /* not a valid address */
3143                                 break;
3144                         if (i == TOK_XMIT)
3145                                 cmd->opcode = O_XMIT;
3146                         else if (i == TOK_RECV)
3147                                 cmd->opcode = O_RECV;
3148                         else if (i == TOK_VIA)
3149                                 cmd->opcode = O_VIA;
3150                         break;
3151
3152                 case TOK_ICMPTYPES:
3153                         NEED1("icmptypes requires list of types");
3154                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3155                         av++; ac--;
3156                         break;
3157
3158                 case TOK_ICMP6TYPES:
3159                         NEED1("icmptypes requires list of types");
3160                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av);
3161                         av++; ac--;
3162                         break;
3163
3164                 case TOK_IPTTL:
3165                         NEED1("ipttl requires TTL");
3166                         if (strpbrk(*av, "-,")) {
3167                             if (!add_ports(cmd, *av, 0, O_IPTTL))
3168                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3169                         } else
3170                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3171                         ac--; av++;
3172                         break;
3173
3174                 case TOK_IPID:
3175                         NEED1("ipid requires id");
3176                         if (strpbrk(*av, "-,")) {
3177                             if (!add_ports(cmd, *av, 0, O_IPID))
3178                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3179                         } else
3180                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3181                         ac--; av++;
3182                         break;
3183
3184                 case TOK_IPLEN:
3185                         NEED1("iplen requires length");
3186                         if (strpbrk(*av, "-,")) {
3187                             if (!add_ports(cmd, *av, 0, O_IPLEN))
3188                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3189                         } else
3190                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3191                         ac--; av++;
3192                         break;
3193
3194                 case TOK_IPVER:
3195                         NEED1("ipver requires version");
3196                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3197                         ac--; av++;
3198                         break;
3199
3200                 case TOK_IPPRECEDENCE:
3201                         NEED1("ipprecedence requires value");
3202                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3203                             (strtoul(*av, NULL, 0) & 7) << 5);
3204                         ac--; av++;
3205                         break;
3206
3207                 case TOK_IPOPTS:
3208                         NEED1("missing argument for ipoptions");
3209                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3210                         ac--; av++;
3211                         break;
3212
3213                 case TOK_IPTOS:
3214                         NEED1("missing argument for iptos");
3215                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3216                         ac--; av++;
3217                         break;
3218
3219                 case TOK_UID:
3220                         NEED1("uid requires argument");
3221                     {
3222                         char *end;
3223                         uid_t uid;
3224                         struct passwd *pwd;
3225
3226                         cmd->opcode = O_UID;
3227                         uid = strtoul(*av, &end, 0);
3228                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3229                         if (pwd == NULL)
3230                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3231                         cmd32->d[0] = pwd->pw_uid;
3232                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3233                         ac--; av++;
3234                     }
3235                         break;
3236
3237                 case TOK_GID:
3238                         NEED1("gid requires argument");
3239                     {
3240                         char *end;
3241                         gid_t gid;
3242                         struct group *grp;
3243
3244                         cmd->opcode = O_GID;
3245                         gid = strtoul(*av, &end, 0);
3246                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3247                         if (grp == NULL)
3248                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3249                         cmd32->d[0] = grp->gr_gid;
3250                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3251                         ac--; av++;
3252                     }
3253                         break;
3254
3255                 case TOK_JAIL:
3256                         NEED1("jail requires argument");
3257                     {
3258                         char *end;
3259                         int jid;
3260
3261                         cmd->opcode = O_JAIL;
3262                         jid = (int)strtol(*av, &end, 0);
3263                         if (jid < 0 || *end != '\0')
3264                                 errx(EX_DATAERR, "jail requires prison ID");
3265                         cmd32->d[0] = (uint32_t)jid;
3266                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3267                         ac--; av++;
3268                     }
3269                         break;
3270
3271                 case TOK_ESTAB:
3272                         fill_cmd(cmd, O_ESTAB, 0, 0);
3273                         break;
3274
3275                 case TOK_SETUP:
3276                         fill_cmd(cmd, O_TCPFLAGS, 0,
3277                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3278                         break;
3279
3280                 case TOK_TCPDATALEN:
3281                         NEED1("tcpdatalen requires length");
3282                         if (strpbrk(*av, "-,")) {
3283                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN))
3284                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3285                         } else
3286                             fill_cmd(cmd, O_TCPDATALEN, 0,
3287                                     strtoul(*av, NULL, 0));
3288                         ac--; av++;
3289                         break;
3290
3291                 case TOK_TCPOPTS:
3292                         NEED1("missing argument for tcpoptions");
3293                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3294                         ac--; av++;
3295                         break;
3296
3297                 case TOK_TCPSEQ:
3298                 case TOK_TCPACK:
3299                         NEED1("tcpseq/tcpack requires argument");
3300                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3301                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3302                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3303                         ac--; av++;
3304                         break;
3305
3306                 case TOK_TCPWIN:
3307                         NEED1("tcpwin requires length");
3308                         fill_cmd(cmd, O_TCPWIN, 0,
3309                             htons(strtoul(*av, NULL, 0)));
3310                         ac--; av++;
3311                         break;
3312
3313                 case TOK_TCPFLAGS:
3314                         NEED1("missing argument for tcpflags");
3315                         cmd->opcode = O_TCPFLAGS;
3316                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3317                         ac--; av++;
3318                         break;
3319
3320                 case TOK_KEEPSTATE:
3321                         if (open_par)
3322                                 errx(EX_USAGE, "keep-state cannot be part "
3323                                     "of an or block");
3324                         if (have_state)
3325                                 errx(EX_USAGE, "only one of keep-state "
3326                                         "and limit is allowed");
3327                         have_state = cmd;
3328                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3329                         break;
3330
3331                 case TOK_LIMIT: {
3332                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3333                         int val;
3334
3335                         if (open_par)
3336                                 errx(EX_USAGE,
3337                                     "limit cannot be part of an or block");
3338                         if (have_state)
3339                                 errx(EX_USAGE, "only one of keep-state and "
3340                                     "limit is allowed");
3341                         have_state = cmd;
3342
3343                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3344                         cmd->opcode = O_LIMIT;
3345                         c->limit_mask = c->conn_limit = 0;
3346
3347                         while (ac > 0) {
3348                                 if ((val = match_token(limit_masks, *av)) <= 0)
3349                                         break;
3350                                 c->limit_mask |= val;
3351                                 ac--; av++;
3352                         }
3353
3354                         if (c->limit_mask == 0)
3355                                 errx(EX_USAGE, "limit: missing limit mask");
3356
3357                         GET_UINT_ARG(c->conn_limit, 1, IPFW_DEFAULT_RULE - 1,
3358                             TOK_LIMIT, rule_options);
3359
3360                         ac--; av++;
3361                         break;
3362                 }
3363
3364                 case TOK_PROTO:
3365                         NEED1("missing protocol");
3366                         if (add_proto(cmd, *av, &proto)) {
3367                                 ac--; av++;
3368                         } else
3369                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3370                                     *av);
3371                         break;
3372
3373                 case TOK_SRCIP:
3374                         NEED1("missing source IP");
3375                         if (add_srcip(cmd, *av)) {
3376                                 ac--; av++;
3377                         }
3378                         break;
3379
3380                 case TOK_DSTIP:
3381                         NEED1("missing destination IP");
3382                         if (add_dstip(cmd, *av)) {
3383                                 ac--; av++;
3384                         }
3385                         break;
3386
3387                 case TOK_SRCIP6:
3388                         NEED1("missing source IP6");
3389                         if (add_srcip6(cmd, *av)) {
3390                                 ac--; av++;
3391                         }
3392                         break;
3393
3394                 case TOK_DSTIP6:
3395                         NEED1("missing destination IP6");
3396                         if (add_dstip6(cmd, *av)) {
3397                                 ac--; av++;
3398                         }
3399                         break;
3400
3401                 case TOK_SRCPORT:
3402                         NEED1("missing source port");
3403                         if (_substrcmp(*av, "any") == 0 ||
3404                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3405                                 ac--; av++;
3406                         } else
3407                                 errx(EX_DATAERR, "invalid source port %s", *av);
3408                         break;
3409
3410                 case TOK_DSTPORT:
3411                         NEED1("missing destination port");
3412                         if (_substrcmp(*av, "any") == 0 ||
3413                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3414                                 ac--; av++;
3415                         } else
3416                                 errx(EX_DATAERR, "invalid destination port %s",
3417                                     *av);
3418                         break;
3419
3420                 case TOK_MAC:
3421                         if (add_mac(cmd, ac, av)) {
3422                                 ac -= 2; av += 2;
3423                         }
3424                         break;
3425
3426                 case TOK_MACTYPE:
3427                         NEED1("missing mac type");
3428                         if (!add_mactype(cmd, ac, *av))
3429                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3430                         ac--; av++;
3431                         break;
3432
3433                 case TOK_VERREVPATH:
3434                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3435                         break;
3436
3437                 case TOK_VERSRCREACH:
3438                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3439                         break;
3440
3441                 case TOK_ANTISPOOF:
3442                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3443                         break;
3444
3445                 case TOK_IPSEC:
3446                         fill_cmd(cmd, O_IPSEC, 0, 0);
3447                         break;
3448
3449                 case TOK_IPV6:
3450                         fill_cmd(cmd, O_IP6, 0, 0);
3451                         break;
3452
3453                 case TOK_IPV4:
3454                         fill_cmd(cmd, O_IP4, 0, 0);
3455                         break;
3456
3457                 case TOK_EXT6HDR:
3458                         fill_ext6hdr( cmd, *av );
3459                         ac--; av++;
3460                         break;
3461
3462                 case TOK_FLOWID:
3463                         if (proto != IPPROTO_IPV6 )
3464                                 errx( EX_USAGE, "flow-id filter is active "
3465                                     "only for ipv6 protocol\n");
3466                         fill_flow6( (ipfw_insn_u32 *) cmd, *av );
3467                         ac--; av++;
3468                         break;
3469
3470                 case TOK_COMMENT:
3471                         fill_comment(cmd, ac, av);
3472                         av += ac;
3473                         ac = 0;
3474                         break;
3475
3476                 case TOK_TAGGED:
3477                         if (ac > 0 && strpbrk(*av, "-,")) {
3478                                 if (!add_ports(cmd, *av, 0, O_TAGGED))
3479                                         errx(EX_DATAERR, "tagged: invalid tag"
3480                                             " list: %s", *av);
3481                         }
3482                         else {
3483                                 uint16_t tag;
3484
3485                                 GET_UINT_ARG(tag, 1, IPFW_DEFAULT_RULE - 1,
3486                                     TOK_TAGGED, rule_options);
3487                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3488                         }
3489                         ac--; av++;
3490                         break;
3491
3492                 case TOK_FIB:
3493                         NEED1("fib requires fib number");
3494                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3495                         ac--; av++;
3496                         break;
3497
3498                 default:
3499                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3500                 }
3501                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3502                         prev = cmd;
3503                         cmd = next_cmd(cmd);
3504                 }
3505         }
3506
3507 done:
3508         /*
3509          * Now copy stuff into the rule.
3510          * If we have a keep-state option, the first instruction
3511          * must be a PROBE_STATE (which is generated here).
3512          * If we have a LOG option, it was stored as the first command,
3513          * and now must be moved to the top of the action part.
3514          */
3515         dst = (ipfw_insn *)rule->cmd;
3516
3517         /*
3518          * First thing to write into the command stream is the match probability.
3519          */
3520         if (match_prob != 1) { /* 1 means always match */
3521                 dst->opcode = O_PROB;
3522                 dst->len = 2;
3523                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3524                 dst += dst->len;
3525         }
3526
3527         /*
3528          * generate O_PROBE_STATE if necessary
3529          */
3530         if (have_state && have_state->opcode != O_CHECK_STATE) {
3531                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3532                 dst = next_cmd(dst);
3533         }
3534
3535         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3536         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3537                 i = F_LEN(src);
3538
3539                 switch (src->opcode) {
3540                 case O_LOG:
3541                 case O_KEEP_STATE:
3542                 case O_LIMIT:
3543                 case O_ALTQ:
3544                 case O_TAG:
3545                         break;
3546                 default:
3547                         bcopy(src, dst, i * sizeof(uint32_t));
3548                         dst += i;
3549                 }
3550         }
3551
3552         /*
3553          * put back the have_state command as last opcode
3554          */
3555         if (have_state && have_state->opcode != O_CHECK_STATE) {
3556                 i = F_LEN(have_state);
3557                 bcopy(have_state, dst, i * sizeof(uint32_t));
3558                 dst += i;
3559         }
3560         /*
3561          * start action section
3562          */
3563         rule->act_ofs = dst - rule->cmd;
3564
3565         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3566         if (have_log) {
3567                 i = F_LEN(have_log);
3568                 bcopy(have_log, dst, i * sizeof(uint32_t));
3569                 dst += i;
3570         }
3571         if (have_altq) {
3572                 i = F_LEN(have_altq);
3573                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3574                 dst += i;
3575         }
3576         if (have_tag) {
3577                 i = F_LEN(have_tag);
3578                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3579                 dst += i;
3580         }
3581         /*
3582          * copy all other actions
3583          */
3584         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3585                 i = F_LEN(src);
3586                 bcopy(src, dst, i * sizeof(uint32_t));
3587                 dst += i;
3588         }
3589
3590         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3591         i = (char *)dst - (char *)rule;
3592         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3593                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3594         if (!co.do_quiet)
3595                 show_ipfw(rule, 0, 0);
3596 }
3597
3598 /*
3599  * clear the counters or the log counters.
3600  */
3601 void
3602 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3603 {
3604         uint32_t arg, saved_arg;
3605         int failed = EX_OK;
3606         char const *errstr;
3607         char const *name = optname ? "RESETLOG" : "ZERO";
3608
3609         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3610
3611         av++; ac--;
3612
3613         if (!ac) {
3614                 /* clear all entries */
3615                 if (do_cmd(optname, NULL, 0) < 0)
3616                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3617                 if (!co.do_quiet)
3618                         printf("%s.\n", optname == IP_FW_ZERO ?
3619                             "Accounting cleared":"Logging counts reset");
3620
3621                 return;
3622         }
3623
3624         while (ac) {
3625                 /* Rule number */
3626                 if (isdigit(**av)) {
3627                         arg = strtonum(*av, 0, 0xffff, &errstr);
3628                         if (errstr)
3629                                 errx(EX_DATAERR,
3630                                     "invalid rule number %s\n", *av);
3631                         saved_arg = arg;
3632                         if (co.use_set)
3633                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3634                         av++;
3635                         ac--;
3636                         if (do_cmd(optname, &arg, sizeof(arg))) {
3637                                 warn("rule %u: setsockopt(IP_FW_%s)",
3638                                     saved_arg, name);
3639                                 failed = EX_UNAVAILABLE;
3640                         } else if (!co.do_quiet)
3641                                 printf("Entry %d %s.\n", saved_arg,
3642                                     optname == IP_FW_ZERO ?
3643                                         "cleared" : "logging count reset");
3644                 } else {
3645                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3646                 }
3647         }
3648         if (failed != EX_OK)
3649                 exit(failed);
3650 }
3651
3652 void
3653 ipfw_flush(int force)
3654 {
3655         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3656
3657         if (!force && !co.do_quiet) { /* need to ask user */
3658                 int c;
3659
3660                 printf("Are you sure? [yn] ");
3661                 fflush(stdout);
3662                 do {
3663                         c = toupper(getc(stdin));
3664                         while (c != '\n' && getc(stdin) != '\n')
3665                                 if (feof(stdin))
3666                                         return; /* and do not flush */
3667                 } while (c != 'Y' && c != 'N');
3668                 printf("\n");
3669                 if (c == 'N')   /* user said no */
3670                         return;
3671         }
3672         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3673         if (co.use_set) {
3674                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3675                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3676                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3677         } else if (do_cmd(cmd, NULL, 0) < 0)
3678                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3679                     co.do_pipe ? "DUMMYNET" : "FW");
3680         if (!co.do_quiet)
3681                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3682 }
3683
3684
3685 static void table_list(ipfw_table_entry ent, int need_header);
3686
3687 /*
3688  * This one handles all table-related commands
3689  *      ipfw table N add addr[/masklen] [value]
3690  *      ipfw table N delete addr[/masklen]
3691  *      ipfw table {N | all} flush
3692  *      ipfw table {N | all} list
3693  */
3694 void
3695 ipfw_table_handler(int ac, char *av[])
3696 {
3697         ipfw_table_entry ent;
3698         int do_add;
3699         int is_all;
3700         size_t len;
3701         char *p;
3702         uint32_t a;
3703         uint32_t tables_max;
3704
3705         len = sizeof(tables_max);
3706         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3707                 NULL, 0) == -1) {
3708 #ifdef IPFW_TABLES_MAX
3709                 warn("Warn: Failed to get the max tables number via sysctl. "
3710                      "Using the compiled in defaults. \nThe reason was");
3711                 tables_max = IPFW_TABLES_MAX;
3712 #else
3713                 errx(1, "Failed sysctlbyname(\"net.inet.ip.fw.tables_max\")");
3714 #endif
3715         }
3716
3717         ac--; av++;
3718         if (ac && isdigit(**av)) {
3719                 ent.tbl = atoi(*av);
3720                 is_all = 0;
3721                 ac--; av++;
3722         } else if (ac && _substrcmp(*av, "all") == 0) {
3723                 ent.tbl = 0;
3724                 is_all = 1;
3725                 ac--; av++;
3726         } else
3727                 errx(EX_USAGE, "table number or 'all' keyword required");
3728         if (ent.tbl >= tables_max)
3729                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
3730                         "value (%d)", tables_max - 1);
3731         NEED1("table needs command");
3732         if (is_all && _substrcmp(*av, "list") != 0
3733                    && _substrcmp(*av, "flush") != 0)
3734                 errx(EX_USAGE, "table number required");
3735
3736         if (_substrcmp(*av, "add") == 0 ||
3737             _substrcmp(*av, "delete") == 0) {
3738                 do_add = **av == 'a';
3739                 ac--; av++;
3740                 if (!ac)
3741                         errx(EX_USAGE, "IP address required");
3742                 p = strchr(*av, '/');
3743                 if (p) {
3744                         *p++ = '\0';
3745                         ent.masklen = atoi(p);
3746                         if (ent.masklen > 32)
3747                                 errx(EX_DATAERR, "bad width ``%s''", p);
3748                 } else
3749                         ent.masklen = 32;
3750                 if (lookup_host(*av, (struct in_addr *)&ent.addr) != 0)
3751                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3752                 ac--; av++;
3753                 if (do_add && ac) {
3754                         unsigned int tval;
3755                         /* isdigit is a bit of a hack here.. */
3756                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
3757                                 ent.value = strtoul(*av, NULL, 0);
3758                         } else {
3759                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
3760                                         /* The value must be stored in host order        *
3761                                          * so that the values < 65k can be distinguished */
3762                                         ent.value = ntohl(tval);
3763                                 } else {
3764                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
3765                                 }
3766                         }
3767                 } else
3768                         ent.value = 0;
3769                 if (do_cmd(do_add ? IP_FW_TABLE_ADD : IP_FW_TABLE_DEL,
3770                     &ent, sizeof(ent)) < 0) {
3771                         /* If running silent, don't bomb out on these errors. */
3772                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
3773                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
3774                                     do_add ? "ADD" : "DEL");
3775                         /* In silent mode, react to a failed add by deleting */
3776                         if (do_add) {
3777                                 do_cmd(IP_FW_TABLE_DEL, &ent, sizeof(ent));
3778                                 if (do_cmd(IP_FW_TABLE_ADD,
3779                                     &ent, sizeof(ent)) < 0)
3780                                         err(EX_OSERR,
3781                                             "setsockopt(IP_FW_TABLE_ADD)");
3782                         }
3783                 }
3784         } else if (_substrcmp(*av, "flush") == 0) {
3785                 a = is_all ? tables_max : (ent.tbl + 1);
3786                 do {
3787                         if (do_cmd(IP_FW_TABLE_FLUSH, &ent.tbl,
3788                             sizeof(ent.tbl)) < 0)
3789                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
3790                 } while (++ent.tbl < a);
3791         } else if (_substrcmp(*av, "list") == 0) {
3792                 a = is_all ? tables_max : (ent.tbl + 1);
3793                 do {
3794                         table_list(ent, is_all);
3795                 } while (++ent.tbl < a);
3796         } else
3797                 errx(EX_USAGE, "invalid table command %s", *av);
3798 }
3799
3800 static void
3801 table_list(ipfw_table_entry ent, int need_header)
3802 {
3803         ipfw_table *tbl;
3804         socklen_t l;
3805         uint32_t a;
3806
3807         a = ent.tbl;
3808         l = sizeof(a);
3809         if (do_cmd(IP_FW_TABLE_GETSIZE, &a, (uintptr_t)&l) < 0)
3810                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_GETSIZE)");
3811
3812         /* If a is zero we have nothing to do, the table is empty. */
3813         if (a == 0)
3814                 return;
3815
3816         l = sizeof(*tbl) + a * sizeof(ipfw_table_entry);
3817         tbl = safe_calloc(1, l);
3818         tbl->tbl = ent.tbl;
3819         if (do_cmd(IP_FW_TABLE_LIST, tbl, (uintptr_t)&l) < 0)
3820                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_LIST)");
3821         if (tbl->cnt && need_header)
3822                 printf("---table(%d)---\n", tbl->tbl);
3823         for (a = 0; a < tbl->cnt; a++) {
3824                 unsigned int tval;
3825                 tval = tbl->ent[a].value;
3826                 if (co.do_value_as_ip) {
3827                         char tbuf[128];
3828                         strncpy(tbuf, inet_ntoa(*(struct in_addr *)
3829                                 &tbl->ent[a].addr), 127);
3830                         /* inet_ntoa expects network order */
3831                         tval = htonl(tval);
3832                         printf("%s/%u %s\n", tbuf, tbl->ent[a].masklen,
3833                                 inet_ntoa(*(struct in_addr *)&tval));
3834                 } else {
3835                         printf("%s/%u %u\n",
3836                                 inet_ntoa(*(struct in_addr *)&tbl->ent[a].addr),
3837                                 tbl->ent[a].masklen, tval);
3838                 }
3839         }
3840         free(tbl);
3841 }