sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002-2003 Luigi Rizzo
   3  * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
   4  * Copyright (c) 1994 Ugen J.S.Antsilevich
   5  *
   6  * Idea and grammar partially left from:
   7  * Copyright (c) 1993 Daniel Boulet
   8  *
   9  * Redistribution and use in source forms, with and without modification,
  10  * are permitted provided that this entire comment appears intact.
  11  *
  12  * Redistribution in binary form may occur without any restrictions.
  13  * Obviously, it would be nice if you gave credit where credit is due
  14  * but requiring it would be too onerous.
  15  *
  16  * This software is provided ``AS IS'' without any warranties of any kind.
  17  *
  18  * NEW command line interface for IP firewall facility
  19  *
  20  * $FreeBSD$
  21  */
  22
  23 #include <sys/types.h>
  24 #include <sys/param.h>
  25 #include <sys/socket.h>
  26 #include <sys/sockio.h>
  27 #include <sys/sysctl.h>
  28
  29 #include "ipfw2.h"
  30
  31 #include <ctype.h>
  32 #include <err.h>
  33 #include <errno.h>
  34 #include <grp.h>
  35 #include <netdb.h>
  36 #include <pwd.h>
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <sysexits.h>
  41 #include <time.h>       /* ctime */
  42 #include <timeconv.h>   /* _long_to_time */
  43 #include <unistd.h>
  44 #include <fcntl.h>
  45 #include <stddef.h>     /* offsetof */
  46
  47 #include <net/ethernet.h>
  48 #include <net/if.h>             /* only IFNAMSIZ */
  49 #include <netinet/in.h>
  50 #include <netinet/in_systm.h>   /* only n_short, n_long */
  51 #include <netinet/ip.h>
  52 #include <netinet/ip_icmp.h>
  53 #include <netinet/ip_fw.h>
  54 #include <netinet/tcp.h>
  55 #include <arpa/inet.h>
  56
  57 struct cmdline_opts co; /* global options */
  58
  59 int resvd_set_number = RESVD_SET;
  60
  61 int ipfw_socket = -1;
  62
  63 #ifndef s6_addr32
  64 #define s6_addr32 __u6_addr.__u6_addr32
  65 #endif
  66
  67 #define CHECK_LENGTH(v, len) do {                               \
  68         if ((v) < (len))                                        \
  69                 errx(EX_DATAERR, "Rule too long");              \
  70         } while (0)
  71 /*
  72  * Check if we have enough space in cmd buffer. Note that since
  73  * first 8? u32 words are reserved by reserved header, full cmd
  74  * buffer can't be used, so we need to protect from buffer overrun
  75  * only. At the beginnig, cblen is less than actual buffer size by
  76  * size of ipfw_insn_u32 instruction + 1 u32 work. This eliminates need
  77  * for checking small instructions fitting in given range.
  78  * We also (ab)use the fact that ipfw_insn is always the first field
  79  * for any custom instruction.
  80  */
  81 #define CHECK_CMDLEN    CHECK_LENGTH(cblen, F_LEN((ipfw_insn *)cmd))
  82
  83 #define GET_UINT_ARG(arg, min, max, tok, s_x) do {                      \
  84         if (!av[0])                                                     \
  85                 errx(EX_USAGE, "%s: missing argument", match_value(s_x, tok)); \
  86         if (_substrcmp(*av, "tablearg") == 0) {                         \
  87                 arg = IP_FW_TABLEARG;                                   \
  88                 break;                                                  \
  89         }                                                               \
  90                                                                         \
  91         {                                                               \
  92         long _xval;                                                     \
  93         char *end;                                                      \
  94                                                                         \
  95         _xval = strtol(*av, &end, 10);                                  \
  96                                                                         \
  97         if (!isdigit(**av) || *end != '\0' || (_xval == 0 && errno == EINVAL)) \
  98                 errx(EX_DATAERR, "%s: invalid argument: %s",            \
  99                     match_value(s_x, tok), *av);                        \
 100                                                                         \
 101         if (errno == ERANGE || _xval < min || _xval > max)              \
 102                 errx(EX_DATAERR, "%s: argument is out of range (%u..%u): %s", \
 103                     match_value(s_x, tok), min, max, *av);              \
 104                                                                         \
 105         if (_xval == IP_FW_TABLEARG)                                    \
 106                 errx(EX_DATAERR, "%s: illegal argument value: %s",      \
 107                     match_value(s_x, tok), *av);                        \
 108         arg = _xval;                                                    \
 109         }                                                               \
 110 } while (0)
 111
 112 static void
 113 PRINT_UINT_ARG(const char *str, uint32_t arg)
 114 {
 115         if (str != NULL)
 116                 printf("%s",str);
 117         if (arg == IP_FW_TABLEARG)
 118                 printf("tablearg");
 119         else
 120                 printf("%u", arg);
 121 }
 122
 123 static struct _s_x f_tcpflags[] = {
 124         { "syn", TH_SYN },
 125         { "fin", TH_FIN },
 126         { "ack", TH_ACK },
 127         { "psh", TH_PUSH },
 128         { "rst", TH_RST },
 129         { "urg", TH_URG },
 130         { "tcp flag", 0 },
 131         { NULL, 0 }
 132 };
 133
 134 static struct _s_x f_tcpopts[] = {
 135         { "mss",        IP_FW_TCPOPT_MSS },
 136         { "maxseg",     IP_FW_TCPOPT_MSS },
 137         { "window",     IP_FW_TCPOPT_WINDOW },
 138         { "sack",       IP_FW_TCPOPT_SACK },
 139         { "ts",         IP_FW_TCPOPT_TS },
 140         { "timestamp",  IP_FW_TCPOPT_TS },
 141         { "cc",         IP_FW_TCPOPT_CC },
 142         { "tcp option", 0 },
 143         { NULL, 0 }
 144 };
 145
 146 /*
 147  * IP options span the range 0 to 255 so we need to remap them
 148  * (though in fact only the low 5 bits are significant).
 149  */
 150 static struct _s_x f_ipopts[] = {
 151         { "ssrr",       IP_FW_IPOPT_SSRR},
 152         { "lsrr",       IP_FW_IPOPT_LSRR},
 153         { "rr",         IP_FW_IPOPT_RR},
 154         { "ts",         IP_FW_IPOPT_TS},
 155         { "ip option",  0 },
 156         { NULL, 0 }
 157 };
 158
 159 static struct _s_x f_iptos[] = {
 160         { "lowdelay",   IPTOS_LOWDELAY},
 161         { "throughput", IPTOS_THROUGHPUT},
 162         { "reliability", IPTOS_RELIABILITY},
 163         { "mincost",    IPTOS_MINCOST},
 164         { "congestion", IPTOS_ECN_CE},
 165         { "ecntransport", IPTOS_ECN_ECT0},
 166         { "ip tos option", 0},
 167         { NULL, 0 }
 168 };
 169
 170 static struct _s_x limit_masks[] = {
 171         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 172         {"src-addr",    DYN_SRC_ADDR},
 173         {"src-port",    DYN_SRC_PORT},
 174         {"dst-addr",    DYN_DST_ADDR},
 175         {"dst-port",    DYN_DST_PORT},
 176         {NULL,          0}
 177 };
 178
 179 /*
 180  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 181  * This is only used in this code.
 182  */
 183 #define IPPROTO_ETHERTYPE       0x1000
 184 static struct _s_x ether_types[] = {
 185     /*
 186      * Note, we cannot use "-:&/" in the names because they are field
 187      * separators in the type specifications. Also, we use s = NULL as
 188      * end-delimiter, because a type of 0 can be legal.
 189      */
 190         { "ip",         0x0800 },
 191         { "ipv4",       0x0800 },
 192         { "ipv6",       0x86dd },
 193         { "arp",        0x0806 },
 194         { "rarp",       0x8035 },
 195         { "vlan",       0x8100 },
 196         { "loop",       0x9000 },
 197         { "trail",      0x1000 },
 198         { "at",         0x809b },
 199         { "atalk",      0x809b },
 200         { "aarp",       0x80f3 },
 201         { "pppoe_disc", 0x8863 },
 202         { "pppoe_sess", 0x8864 },
 203         { "ipx_8022",   0x00E0 },
 204         { "ipx_8023",   0x0000 },
 205         { "ipx_ii",     0x8137 },
 206         { "ipx_snap",   0x8137 },
 207         { "ipx",        0x8137 },
 208         { "ns",         0x0600 },
 209         { NULL,         0 }
 210 };
 211
 212
 213 static struct _s_x rule_actions[] = {
 214         { "accept",             TOK_ACCEPT },
 215         { "pass",               TOK_ACCEPT },
 216         { "allow",              TOK_ACCEPT },
 217         { "permit",             TOK_ACCEPT },
 218         { "count",              TOK_COUNT },
 219         { "pipe",               TOK_PIPE },
 220         { "queue",              TOK_QUEUE },
 221         { "divert",             TOK_DIVERT },
 222         { "tee",                TOK_TEE },
 223         { "netgraph",           TOK_NETGRAPH },
 224         { "ngtee",              TOK_NGTEE },
 225         { "fwd",                TOK_FORWARD },
 226         { "forward",            TOK_FORWARD },
 227         { "skipto",             TOK_SKIPTO },
 228         { "deny",               TOK_DENY },
 229         { "drop",               TOK_DENY },
 230         { "reject",             TOK_REJECT },
 231         { "reset6",             TOK_RESET6 },
 232         { "reset",              TOK_RESET },
 233         { "unreach6",           TOK_UNREACH6 },
 234         { "unreach",            TOK_UNREACH },
 235         { "check-state",        TOK_CHECKSTATE },
 236         { "//",                 TOK_COMMENT },
 237         { "nat",                TOK_NAT },
 238         { "reass",              TOK_REASS },
 239         { "setfib",             TOK_SETFIB },
 240         { "call",               TOK_CALL },
 241         { "return",             TOK_RETURN },
 242         { NULL, 0 }     /* terminator */
 243 };
 244
 245 static struct _s_x rule_action_params[] = {
 246         { "altq",               TOK_ALTQ },
 247         { "log",                TOK_LOG },
 248         { "tag",                TOK_TAG },
 249         { "untag",              TOK_UNTAG },
 250         { NULL, 0 }     /* terminator */
 251 };
 252
 253 /*
 254  * The 'lookup' instruction accepts one of the following arguments.
 255  * -1 is a terminator for the list.
 256  * Arguments are passed as v[1] in O_DST_LOOKUP options.
 257  */
 258 static int lookup_key[] = {
 259         TOK_DSTIP, TOK_SRCIP, TOK_DSTPORT, TOK_SRCPORT,
 260         TOK_UID, TOK_JAIL, TOK_DSCP, -1 };
 261
 262 static struct _s_x rule_options[] = {
 263         { "tagged",             TOK_TAGGED },
 264         { "uid",                TOK_UID },
 265         { "gid",                TOK_GID },
 266         { "jail",               TOK_JAIL },
 267         { "in",                 TOK_IN },
 268         { "limit",              TOK_LIMIT },
 269         { "keep-state",         TOK_KEEPSTATE },
 270         { "bridged",            TOK_LAYER2 },
 271         { "layer2",             TOK_LAYER2 },
 272         { "out",                TOK_OUT },
 273         { "diverted",           TOK_DIVERTED },
 274         { "diverted-loopback",  TOK_DIVERTEDLOOPBACK },
 275         { "diverted-output",    TOK_DIVERTEDOUTPUT },
 276         { "xmit",               TOK_XMIT },
 277         { "recv",               TOK_RECV },
 278         { "via",                TOK_VIA },
 279         { "fragment",           TOK_FRAG },
 280         { "frag",               TOK_FRAG },
 281         { "fib",                TOK_FIB },
 282         { "ipoptions",          TOK_IPOPTS },
 283         { "ipopts",             TOK_IPOPTS },
 284         { "iplen",              TOK_IPLEN },
 285         { "ipid",               TOK_IPID },
 286         { "ipprecedence",       TOK_IPPRECEDENCE },
 287         { "dscp",               TOK_DSCP },
 288         { "iptos",              TOK_IPTOS },
 289         { "ipttl",              TOK_IPTTL },
 290         { "ipversion",          TOK_IPVER },
 291         { "ipver",              TOK_IPVER },
 292         { "estab",              TOK_ESTAB },
 293         { "established",        TOK_ESTAB },
 294         { "setup",              TOK_SETUP },
 295         { "sockarg",            TOK_SOCKARG },
 296         { "tcpdatalen",         TOK_TCPDATALEN },
 297         { "tcpflags",           TOK_TCPFLAGS },
 298         { "tcpflgs",            TOK_TCPFLAGS },
 299         { "tcpoptions",         TOK_TCPOPTS },
 300         { "tcpopts",            TOK_TCPOPTS },
 301         { "tcpseq",             TOK_TCPSEQ },
 302         { "tcpack",             TOK_TCPACK },
 303         { "tcpwin",             TOK_TCPWIN },
 304         { "icmptype",           TOK_ICMPTYPES },
 305         { "icmptypes",          TOK_ICMPTYPES },
 306         { "dst-ip",             TOK_DSTIP },
 307         { "src-ip",             TOK_SRCIP },
 308         { "dst-port",           TOK_DSTPORT },
 309         { "src-port",           TOK_SRCPORT },
 310         { "proto",              TOK_PROTO },
 311         { "MAC",                TOK_MAC },
 312         { "mac",                TOK_MAC },
 313         { "mac-type",           TOK_MACTYPE },
 314         { "verrevpath",         TOK_VERREVPATH },
 315         { "versrcreach",        TOK_VERSRCREACH },
 316         { "antispoof",          TOK_ANTISPOOF },
 317         { "ipsec",              TOK_IPSEC },
 318         { "icmp6type",          TOK_ICMP6TYPES },
 319         { "icmp6types",         TOK_ICMP6TYPES },
 320         { "ext6hdr",            TOK_EXT6HDR},
 321         { "flow-id",            TOK_FLOWID},
 322         { "ipv6",               TOK_IPV6},
 323         { "ip6",                TOK_IPV6},
 324         { "ipv4",               TOK_IPV4},
 325         { "ip4",                TOK_IPV4},
 326         { "dst-ipv6",           TOK_DSTIP6},
 327         { "dst-ip6",            TOK_DSTIP6},
 328         { "src-ipv6",           TOK_SRCIP6},
 329         { "src-ip6",            TOK_SRCIP6},
 330         { "lookup",             TOK_LOOKUP},
 331         { "//",                 TOK_COMMENT },
 332
 333         { "not",                TOK_NOT },              /* pseudo option */
 334         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 335         { "or",                 TOK_OR },               /* pseudo option */
 336         { "|", /* escape */     TOK_OR },               /* pseudo option */
 337         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 338         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 339         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 340         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 341         { NULL, 0 }     /* terminator */
 342 };
 343
 344 /*
 345  * Helper routine to print a possibly unaligned uint64_t on
 346  * various platform. If width > 0, print the value with
 347  * the desired width, followed by a space;
 348  * otherwise, return the required width.
 349  */
 350 int
 351 pr_u64(uint64_t *pd, int width)
 352 {
 353 #ifdef TCC
 354 #define U64_FMT "I64"
 355 #else
 356 #define U64_FMT "llu"
 357 #endif
 358         uint64_t u;
 359         unsigned long long d;
 360
 361         bcopy (pd, &u, sizeof(u));
 362         d = u;
 363         return (width > 0) ?
 364                 printf("%*" U64_FMT " ", width, d) :
 365                 snprintf(NULL, 0, "%" U64_FMT, d) ;
 366 #undef U64_FMT
 367 }
 368
 369 void *
 370 safe_calloc(size_t number, size_t size)
 371 {
 372         void *ret = calloc(number, size);
 373
 374         if (ret == NULL)
 375                 err(EX_OSERR, "calloc");
 376         return ret;
 377 }
 378
 379 void *
 380 safe_realloc(void *ptr, size_t size)
 381 {
 382         void *ret = realloc(ptr, size);
 383
 384         if (ret == NULL)
 385                 err(EX_OSERR, "realloc");
 386         return ret;
 387 }
 388
 389 /*
 390  * conditionally runs the command.
 391  * Selected options or negative -> getsockopt
 392  */
 393 int
 394 do_cmd(int optname, void *optval, uintptr_t optlen)
 395 {
 396         int i;
 397
 398         if (co.test_only)
 399                 return 0;
 400
 401         if (ipfw_socket == -1)
 402                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 403         if (ipfw_socket < 0)
 404                 err(EX_UNAVAILABLE, "socket");
 405
 406         if (optname == IP_FW_GET || optname == IP_DUMMYNET_GET ||
 407             optname == IP_FW_ADD || optname == IP_FW3 ||
 408             optname == IP_FW_NAT_GET_CONFIG ||
 409             optname < 0 ||
 410             optname == IP_FW_NAT_GET_LOG) {
 411                 if (optname < 0)
 412                         optname = -optname;
 413                 i = getsockopt(ipfw_socket, IPPROTO_IP, optname, optval,
 414                         (socklen_t *)optlen);
 415         } else {
 416                 i = setsockopt(ipfw_socket, IPPROTO_IP, optname, optval, optlen);
 417         }
 418         return i;
 419 }
 420
 421 /*
 422  * do_setcmd3 - pass ipfw control cmd to kernel
 423  * @optname: option name
 424  * @optval: pointer to option data
 425  * @optlen: option length
 426  *
 427  * Function encapsulates option value in IP_FW3 socket option
 428  * and calls setsockopt().
 429  * Function returns 0 on success or -1 otherwise.
 430  */
 431 static int
 432 do_setcmd3(int optname, void *optval, socklen_t optlen)
 433 {
 434         socklen_t len;
 435         ip_fw3_opheader *op3;
 436
 437         if (co.test_only)
 438                 return (0);
 439
 440         if (ipfw_socket == -1)
 441                 ipfw_socket = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
 442         if (ipfw_socket < 0)
 443                 err(EX_UNAVAILABLE, "socket");
 444
 445         len = sizeof(ip_fw3_opheader) + optlen;
 446         op3 = alloca(len);
 447         /* Zero reserved fields */
 448         memset(op3, 0, sizeof(ip_fw3_opheader));
 449         memcpy(op3 + 1, optval, optlen);
 450         op3->opcode = optname;
 451
 452         return setsockopt(ipfw_socket, IPPROTO_IP, IP_FW3, op3, len);
 453 }
 454
 455 /**
 456  * match_token takes a table and a string, returns the value associated
 457  * with the string (-1 in case of failure).
 458  */
 459 int
 460 match_token(struct _s_x *table, char *string)
 461 {
 462         struct _s_x *pt;
 463         uint i = strlen(string);
 464
 465         for (pt = table ; i && pt->s != NULL ; pt++)
 466                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 467                         return pt->x;
 468         return -1;
 469 }
 470
 471 /**
 472  * match_value takes a table and a value, returns the string associated
 473  * with the value (NULL in case of failure).
 474  */
 475 char const *
 476 match_value(struct _s_x *p, int value)
 477 {
 478         for (; p->s != NULL; p++)
 479                 if (p->x == value)
 480                         return p->s;
 481         return NULL;
 482 }
 483
 484 /*
 485  * _substrcmp takes two strings and returns 1 if they do not match,
 486  * and 0 if they match exactly or the first string is a sub-string
 487  * of the second.  A warning is printed to stderr in the case that the
 488  * first string is a sub-string of the second.
 489  *
 490  * This function will be removed in the future through the usual
 491  * deprecation process.
 492  */
 493 int
 494 _substrcmp(const char *str1, const char* str2)
 495 {
 496
 497         if (strncmp(str1, str2, strlen(str1)) != 0)
 498                 return 1;
 499
 500         if (strlen(str1) != strlen(str2))
 501                 warnx("DEPRECATED: '%s' matched '%s' as a sub-string",
 502                     str1, str2);
 503         return 0;
 504 }
 505
 506 /*
 507  * _substrcmp2 takes three strings and returns 1 if the first two do not match,
 508  * and 0 if they match exactly or the second string is a sub-string
 509  * of the first.  A warning is printed to stderr in the case that the
 510  * first string does not match the third.
 511  *
 512  * This function exists to warn about the bizarre construction
 513  * strncmp(str, "by", 2) which is used to allow people to use a shortcut
 514  * for "bytes".  The problem is that in addition to accepting "by",
 515  * "byt", "byte", and "bytes", it also excepts "by_rabid_dogs" and any
 516  * other string beginning with "by".
 517  *
 518  * This function will be removed in the future through the usual
 519  * deprecation process.
 520  */
 521 int
 522 _substrcmp2(const char *str1, const char* str2, const char* str3)
 523 {
 524
 525         if (strncmp(str1, str2, strlen(str2)) != 0)
 526                 return 1;
 527
 528         if (strcmp(str1, str3) != 0)
 529                 warnx("DEPRECATED: '%s' matched '%s'",
 530                     str1, str3);
 531         return 0;
 532 }
 533
 534 /*
 535  * prints one port, symbolic or numeric
 536  */
 537 static void
 538 print_port(int proto, uint16_t port)
 539 {
 540
 541         if (proto == IPPROTO_ETHERTYPE) {
 542                 char const *s;
 543
 544                 if (co.do_resolv && (s = match_value(ether_types, port)) )
 545                         printf("%s", s);
 546                 else
 547                         printf("0x%04x", port);
 548         } else {
 549                 struct servent *se = NULL;
 550                 if (co.do_resolv) {
 551                         struct protoent *pe = getprotobynumber(proto);
 552
 553                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 554                 }
 555                 if (se)
 556                         printf("%s", se->s_name);
 557                 else
 558                         printf("%d", port);
 559         }
 560 }
 561
 562 static struct _s_x _port_name[] = {
 563         {"dst-port",    O_IP_DSTPORT},
 564         {"src-port",    O_IP_SRCPORT},
 565         {"ipid",        O_IPID},
 566         {"iplen",       O_IPLEN},
 567         {"ipttl",       O_IPTTL},
 568         {"mac-type",    O_MAC_TYPE},
 569         {"tcpdatalen",  O_TCPDATALEN},
 570         {"tcpwin",      O_TCPWIN},
 571         {"tagged",      O_TAGGED},
 572         {NULL,          0}
 573 };
 574
 575 /*
 576  * Print the values in a list 16-bit items of the types above.
 577  * XXX todo: add support for mask.
 578  */
 579 static void
 580 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 581 {
 582         uint16_t *p = cmd->ports;
 583         int i;
 584         char const *sep;
 585
 586         if (opcode != 0) {
 587                 sep = match_value(_port_name, opcode);
 588                 if (sep == NULL)
 589                         sep = "???";
 590                 printf (" %s", sep);
 591         }
 592         sep = " ";
 593         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 594                 printf("%s", sep);
 595                 print_port(proto, p[0]);
 596                 if (p[0] != p[1]) {
 597                         printf("-");
 598                         print_port(proto, p[1]);
 599                 }
 600                 sep = ",";
 601         }
 602 }
 603
 604 /*
 605  * Like strtol, but also translates service names into port numbers
 606  * for some protocols.
 607  * In particular:
 608  *      proto == -1 disables the protocol check;
 609  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 610  *      proto == <some value in /etc/protocols> matches the values there.
 611  * Returns *end == s in case the parameter is not found.
 612  */
 613 static int
 614 strtoport(char *s, char **end, int base, int proto)
 615 {
 616         char *p, *buf;
 617         char *s1;
 618         int i;
 619
 620         *end = s;               /* default - not found */
 621         if (*s == '\0')
 622                 return 0;       /* not found */
 623
 624         if (isdigit(*s))
 625                 return strtol(s, end, base);
 626
 627         /*
 628          * find separator. '\\' escapes the next char.
 629          */
 630         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 631                 if (*s1 == '\\' && s1[1] != '\0')
 632                         s1++;
 633
 634         buf = safe_calloc(s1 - s + 1, 1);
 635
 636         /*
 637          * copy into a buffer skipping backslashes
 638          */
 639         for (p = s, i = 0; p != s1 ; p++)
 640                 if (*p != '\\')
 641                         buf[i++] = *p;
 642         buf[i++] = '\0';
 643
 644         if (proto == IPPROTO_ETHERTYPE) {
 645                 i = match_token(ether_types, buf);
 646                 free(buf);
 647                 if (i != -1) {  /* found */
 648                         *end = s1;
 649                         return i;
 650                 }
 651         } else {
 652                 struct protoent *pe = NULL;
 653                 struct servent *se;
 654
 655                 if (proto != 0)
 656                         pe = getprotobynumber(proto);
 657                 setservent(1);
 658                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 659                 free(buf);
 660                 if (se != NULL) {
 661                         *end = s1;
 662                         return ntohs(se->s_port);
 663                 }
 664         }
 665         return 0;       /* not found */
 666 }
 667
 668 /*
 669  * Fill the body of the command with the list of port ranges.
 670  */
 671 static int
 672 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto, int cblen)
 673 {
 674         uint16_t a, b, *p = cmd->ports;
 675         int i = 0;
 676         char *s = av;
 677
 678         while (*s) {
 679                 a = strtoport(av, &s, 0, proto);
 680                 if (s == av)                    /* empty or invalid argument */
 681                         return (0);
 682
 683                 CHECK_LENGTH(cblen, i + 2);
 684
 685                 switch (*s) {
 686                 case '-':                       /* a range */
 687                         av = s + 1;
 688                         b = strtoport(av, &s, 0, proto);
 689                         /* Reject expressions like '1-abc' or '1-2-3'. */
 690                         if (s == av || (*s != ',' && *s != '\0'))
 691                                 return (0);
 692                         p[0] = a;
 693                         p[1] = b;
 694                         break;
 695                 case ',':                       /* comma separated list */
 696                 case '\0':
 697                         p[0] = p[1] = a;
 698                         break;
 699                 default:
 700                         warnx("port list: invalid separator <%c> in <%s>",
 701                                 *s, av);
 702                         return (0);
 703                 }
 704
 705                 i++;
 706                 p += 2;
 707                 av = s + 1;
 708         }
 709         if (i > 0) {
 710                 if (i + 1 > F_LEN_MASK)
 711                         errx(EX_DATAERR, "too many ports/ranges\n");
 712                 cmd->o.len |= i + 1;    /* leave F_NOT and F_OR untouched */
 713         }
 714         return (i);
 715 }
 716
 717 static struct _s_x icmpcodes[] = {
 718       { "net",                  ICMP_UNREACH_NET },
 719       { "host",                 ICMP_UNREACH_HOST },
 720       { "protocol",             ICMP_UNREACH_PROTOCOL },
 721       { "port",                 ICMP_UNREACH_PORT },
 722       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 723       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 724       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 725       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 726       { "isolated",             ICMP_UNREACH_ISOLATED },
 727       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 728       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 729       { "tosnet",               ICMP_UNREACH_TOSNET },
 730       { "toshost",              ICMP_UNREACH_TOSHOST },
 731       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 732       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 733       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 734       { NULL, 0 }
 735 };
 736
 737 static void
 738 fill_reject_code(u_short *codep, char *str)
 739 {
 740         int val;
 741         char *s;
 742
 743         val = strtoul(str, &s, 0);
 744         if (s == str || *s != '\0' || val >= 0x100)
 745                 val = match_token(icmpcodes, str);
 746         if (val < 0)
 747                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 748         *codep = val;
 749         return;
 750 }
 751
 752 static void
 753 print_reject_code(uint16_t code)
 754 {
 755         char const *s = match_value(icmpcodes, code);
 756
 757         if (s != NULL)
 758                 printf("unreach %s", s);
 759         else
 760                 printf("unreach %u", code);
 761 }
 762
 763 /*
 764  * Returns the number of bits set (from left) in a contiguous bitmask,
 765  * or -1 if the mask is not contiguous.
 766  * XXX this needs a proper fix.
 767  * This effectively works on masks in big-endian (network) format.
 768  * when compiled on little endian architectures.
 769  *
 770  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 771  * the first bit on the wire is bit 0 of the first byte.
 772  * len is the max length in bits.
 773  */
 774 int
 775 contigmask(uint8_t *p, int len)
 776 {
 777         int i, n;
 778
 779         for (i=0; i<len ; i++)
 780                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 781                         break;
 782         for (n=i+1; n < len; n++)
 783                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 784                         return -1; /* mask not contiguous */
 785         return i;
 786 }
 787
 788 /*
 789  * print flags set/clear in the two bitmasks passed as parameters.
 790  * There is a specialized check for f_tcpflags.
 791  */
 792 static void
 793 print_flags(char const *name, ipfw_insn *cmd, struct _s_x *list)
 794 {
 795         char const *comma = "";
 796         int i;
 797         uint8_t set = cmd->arg1 & 0xff;
 798         uint8_t clear = (cmd->arg1 >> 8) & 0xff;
 799
 800         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 801                 printf(" setup");
 802                 return;
 803         }
 804
 805         printf(" %s ", name);
 806         for (i=0; list[i].x != 0; i++) {
 807                 if (set & list[i].x) {
 808                         set &= ~list[i].x;
 809                         printf("%s%s", comma, list[i].s);
 810                         comma = ",";
 811                 }
 812                 if (clear & list[i].x) {
 813                         clear &= ~list[i].x;
 814                         printf("%s!%s", comma, list[i].s);
 815                         comma = ",";
 816                 }
 817         }
 818 }
 819
 820 /*
 821  * Print the ip address contained in a command.
 822  */
 823 static void
 824 print_ip(ipfw_insn_ip *cmd, char const *s)
 825 {
 826         struct hostent *he = NULL;
 827         uint32_t len = F_LEN((ipfw_insn *)cmd);
 828         uint32_t *a = ((ipfw_insn_u32 *)cmd)->d;
 829
 830         if (cmd->o.opcode == O_IP_DST_LOOKUP && len > F_INSN_SIZE(ipfw_insn_u32)) {
 831                 uint32_t d = a[1];
 832                 const char *arg = "<invalid>";
 833
 834                 if (d < sizeof(lookup_key)/sizeof(lookup_key[0]))
 835                         arg = match_value(rule_options, lookup_key[d]);
 836                 printf("%s lookup %s %d", cmd->o.len & F_NOT ? " not": "",
 837                         arg, cmd->o.arg1);
 838                 return;
 839         }
 840         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 841
 842         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 843                 printf("me");
 844                 return;
 845         }
 846         if (cmd->o.opcode == O_IP_SRC_LOOKUP ||
 847             cmd->o.opcode == O_IP_DST_LOOKUP) {
 848                 printf("table(%u", ((ipfw_insn *)cmd)->arg1);
 849                 if (len == F_INSN_SIZE(ipfw_insn_u32))
 850                         printf(",%u", *a);
 851                 printf(")");
 852                 return;
 853         }
 854         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 855                 uint32_t x, *map = (uint32_t *)&(cmd->mask);
 856                 int i, j;
 857                 char comma = '{';
 858
 859                 x = cmd->o.arg1 - 1;
 860                 x = htonl( ~x );
 861                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 862                 printf("%s/%d", inet_ntoa(cmd->addr),
 863                         contigmask((uint8_t *)&x, 32));
 864                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 865                 x &= 0xff; /* base */
 866                 /*
 867                  * Print bits and ranges.
 868                  * Locate first bit set (i), then locate first bit unset (j).
 869                  * If we have 3+ consecutive bits set, then print them as a
 870                  * range, otherwise only print the initial bit and rescan.
 871                  */
 872                 for (i=0; i < cmd->o.arg1; i++)
 873                         if (map[i/32] & (1<<(i & 31))) {
 874                                 for (j=i+1; j < cmd->o.arg1; j++)
 875                                         if (!(map[ j/32] & (1<<(j & 31))))
 876                                                 break;
 877                                 printf("%c%d", comma, i+x);
 878                                 if (j>i+2) { /* range has at least 3 elements */
 879                                         printf("-%d", j-1+x);
 880                                         i = j-1;
 881                                 }
 882                                 comma = ',';
 883                         }
 884                 printf("}");
 885                 return;
 886         }
 887         /*
 888          * len == 2 indicates a single IP, whereas lists of 1 or more
 889          * addr/mask pairs have len = (2n+1). We convert len to n so we
 890          * use that to count the number of entries.
 891          */
 892     for (len = len / 2; len > 0; len--, a += 2) {
 893         int mb =        /* mask length */
 894             (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST) ?
 895                 32 : contigmask((uint8_t *)&(a[1]), 32);
 896         if (mb == 32 && co.do_resolv)
 897                 he = gethostbyaddr((char *)&(a[0]), sizeof(u_long), AF_INET);
 898         if (he != NULL)         /* resolved to name */
 899                 printf("%s", he->h_name);
 900         else if (mb == 0)       /* any */
 901                 printf("any");
 902         else {          /* numeric IP followed by some kind of mask */
 903                 printf("%s", inet_ntoa( *((struct in_addr *)&a[0]) ) );
 904                 if (mb < 0)
 905                         printf(":%s", inet_ntoa( *((struct in_addr *)&a[1]) ) );
 906                 else if (mb < 32)
 907                         printf("/%d", mb);
 908         }
 909         if (len > 1)
 910                 printf(",");
 911     }
 912 }
 913
 914 /*
 915  * prints a MAC address/mask pair
 916  */
 917 static void
 918 print_mac(uint8_t *addr, uint8_t *mask)
 919 {
 920         int l = contigmask(mask, 48);
 921
 922         if (l == 0)
 923                 printf(" any");
 924         else {
 925                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 926                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 927                 if (l == -1)
 928                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 929                             mask[0], mask[1], mask[2],
 930                             mask[3], mask[4], mask[5]);
 931                 else if (l < 48)
 932                         printf("/%d", l);
 933         }
 934 }
 935
 936 static void
 937 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 938 {
 939         uint8_t type;
 940
 941         cmd->d[0] = 0;
 942         while (*av) {
 943                 if (*av == ',')
 944                         av++;
 945
 946                 type = strtoul(av, &av, 0);
 947
 948                 if (*av != ',' && *av != '\0')
 949                         errx(EX_DATAERR, "invalid ICMP type");
 950
 951                 if (type > 31)
 952                         errx(EX_DATAERR, "ICMP type out of range");
 953
 954                 cmd->d[0] |= 1 << type;
 955         }
 956         cmd->o.opcode = O_ICMPTYPE;
 957         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 958 }
 959
 960 static void
 961 print_icmptypes(ipfw_insn_u32 *cmd)
 962 {
 963         int i;
 964         char sep= ' ';
 965
 966         printf(" icmptypes");
 967         for (i = 0; i < 32; i++) {
 968                 if ( (cmd->d[0] & (1 << (i))) == 0)
 969                         continue;
 970                 printf("%c%d", sep, i);
 971                 sep = ',';
 972         }
 973 }
 974
 975 /*
 976  * show_ipfw() prints the body of an ipfw rule.
 977  * Because the standard rule has at least proto src_ip dst_ip, we use
 978  * a helper function to produce these entries if not provided explicitly.
 979  * The first argument is the list of fields we have, the second is
 980  * the list of fields we want to be printed.
 981  *
 982  * Special cases if we have provided a MAC header:
 983  *   + if the rule does not contain IP addresses/ports, do not print them;
 984  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 985  *
 986  * Once we have 'have_options', IP header fields are printed as options.
 987  */
 988 #define HAVE_PROTO      0x0001
 989 #define HAVE_SRCIP      0x0002
 990 #define HAVE_DSTIP      0x0004
 991 #define HAVE_PROTO4     0x0008
 992 #define HAVE_PROTO6     0x0010
 993 #define HAVE_IP         0x0100
 994 #define HAVE_OPTIONS    0x8000
 995
 996 static void
 997 show_prerequisites(int *flags, int want, int cmd)
 998 {
 999         (void)cmd;      /* UNUSED */
1000         if (co.comment_only)
1001                 return;
1002         if ( (*flags & HAVE_IP) == HAVE_IP)
1003                 *flags |= HAVE_OPTIONS;
1004
1005         if ( !(*flags & HAVE_OPTIONS)) {
1006                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO)) {
1007                         if ( (*flags & HAVE_PROTO4))
1008                                 printf(" ip4");
1009                         else if ( (*flags & HAVE_PROTO6))
1010                                 printf(" ip6");
1011                         else
1012                                 printf(" ip");
1013                 }
1014                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
1015                         printf(" from any");
1016                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
1017                         printf(" to any");
1018         }
1019         *flags |= want;
1020 }
1021
1022 static void
1023 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
1024 {
1025         static int twidth = 0;
1026         int l;
1027         ipfw_insn *cmd, *tagptr = NULL;
1028         const char *comment = NULL;     /* ptr to comment if we have one */
1029         int proto = 0;          /* default */
1030         int flags = 0;  /* prerequisites */
1031         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
1032         ipfw_insn_altq *altqptr = NULL; /* set if we find an O_ALTQ */
1033         int or_block = 0;       /* we are in an or block */
1034         uint32_t set_disable;
1035
1036         bcopy(&rule->next_rule, &set_disable, sizeof(set_disable));
1037
1038         if (set_disable & (1 << rule->set)) { /* disabled */
1039                 if (!co.show_sets)
1040                         return;
1041                 else
1042                         printf("# DISABLED ");
1043         }
1044         printf("%05u ", rule->rulenum);
1045
1046         if (pcwidth > 0 || bcwidth > 0) {
1047                 pr_u64(&rule->pcnt, pcwidth);
1048                 pr_u64(&rule->bcnt, bcwidth);
1049         }
1050
1051         if (co.do_time == 2)
1052                 printf("%10u ", rule->timestamp);
1053         else if (co.do_time == 1) {
1054                 char timestr[30];
1055                 time_t t = (time_t)0;
1056
1057                 if (twidth == 0) {
1058                         strcpy(timestr, ctime(&t));
1059                         *strchr(timestr, '\n') = '\0';
1060                         twidth = strlen(timestr);
1061                 }
1062                 if (rule->timestamp) {
1063                         t = _long_to_time(rule->timestamp);
1064
1065                         strcpy(timestr, ctime(&t));
1066                         *strchr(timestr, '\n') = '\0';
1067                         printf("%s ", timestr);
1068                 } else {
1069                         printf("%*s", twidth, " ");
1070                 }
1071         }
1072
1073         if (co.show_sets)
1074                 printf("set %d ", rule->set);
1075
1076         /*
1077          * print the optional "match probability"
1078          */
1079         if (rule->cmd_len > 0) {
1080                 cmd = rule->cmd ;
1081                 if (cmd->opcode == O_PROB) {
1082                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
1083                         double d = 1.0 * p->d[0];
1084
1085                         d = (d / 0x7fffffff);
1086                         printf("prob %f ", d);
1087                 }
1088         }
1089
1090         /*
1091          * first print actions
1092          */
1093         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
1094                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
1095                 switch(cmd->opcode) {
1096                 case O_CHECK_STATE:
1097                         printf("check-state");
1098                         /* avoid printing anything else */
1099                         flags = HAVE_PROTO | HAVE_SRCIP |
1100                                 HAVE_DSTIP | HAVE_IP;
1101                         break;
1102
1103                 case O_ACCEPT:
1104                         printf("allow");
1105                         break;
1106
1107                 case O_COUNT:
1108                         printf("count");
1109                         break;
1110
1111                 case O_DENY:
1112                         printf("deny");
1113                         break;
1114
1115                 case O_REJECT:
1116                         if (cmd->arg1 == ICMP_REJECT_RST)
1117                                 printf("reset");
1118                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
1119                                 printf("reject");
1120                         else
1121                                 print_reject_code(cmd->arg1);
1122                         break;
1123
1124                 case O_UNREACH6:
1125                         if (cmd->arg1 == ICMP6_UNREACH_RST)
1126                                 printf("reset6");
1127                         else
1128                                 print_unreach6_code(cmd->arg1);
1129                         break;
1130
1131                 case O_SKIPTO:
1132                         PRINT_UINT_ARG("skipto ", cmd->arg1);
1133                         break;
1134
1135                 case O_PIPE:
1136                         PRINT_UINT_ARG("pipe ", cmd->arg1);
1137                         break;
1138
1139                 case O_QUEUE:
1140                         PRINT_UINT_ARG("queue ", cmd->arg1);
1141                         break;
1142
1143                 case O_DIVERT:
1144                         PRINT_UINT_ARG("divert ", cmd->arg1);
1145                         break;
1146
1147                 case O_TEE:
1148                         PRINT_UINT_ARG("tee ", cmd->arg1);
1149                         break;
1150
1151                 case O_NETGRAPH:
1152                         PRINT_UINT_ARG("netgraph ", cmd->arg1);
1153                         break;
1154
1155                 case O_NGTEE:
1156                         PRINT_UINT_ARG("ngtee ", cmd->arg1);
1157                         break;
1158
1159                 case O_FORWARD_IP:
1160                     {
1161                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
1162
1163                         if (s->sa.sin_addr.s_addr == INADDR_ANY) {
1164                                 printf("fwd tablearg");
1165                         } else {
1166                                 printf("fwd %s", inet_ntoa(s->sa.sin_addr));
1167                         }
1168                         if (s->sa.sin_port)
1169                                 printf(",%d", s->sa.sin_port);
1170                     }
1171                         break;
1172
1173                 case O_FORWARD_IP6:
1174                     {
1175                         char buf[4 + INET6_ADDRSTRLEN + 1];
1176                         ipfw_insn_sa6 *s = (ipfw_insn_sa6 *)cmd;
1177
1178                         printf("fwd %s", inet_ntop(AF_INET6, &s->sa.sin6_addr,
1179                             buf, sizeof(buf)));
1180                         if (s->sa.sin6_port)
1181                                 printf(",%d", s->sa.sin6_port);
1182                     }
1183                         break;
1184
1185                 case O_LOG: /* O_LOG is printed last */
1186                         logptr = (ipfw_insn_log *)cmd;
1187                         break;
1188
1189                 case O_ALTQ: /* O_ALTQ is printed after O_LOG */
1190                         altqptr = (ipfw_insn_altq *)cmd;
1191                         break;
1192
1193                 case O_TAG:
1194                         tagptr = cmd;
1195                         break;
1196
1197                 case O_NAT:
1198                         if (cmd->arg1 != 0)
1199                                 PRINT_UINT_ARG("nat ", cmd->arg1);
1200                         else
1201                                 printf("nat global");
1202                         break;
1203
1204                 case O_SETFIB:
1205                         PRINT_UINT_ARG("setfib ", cmd->arg1);
1206                         break;
1207
1208                 case O_REASS:
1209                         printf("reass");
1210                         break;
1211
1212                 case O_CALLRETURN:
1213                         if (cmd->len & F_NOT)
1214                                 printf("return");
1215                         else
1216                                 PRINT_UINT_ARG("call ", cmd->arg1);
1217                         break;
1218
1219                 default:
1220                         printf("** unrecognized action %d len %d ",
1221                                 cmd->opcode, cmd->len);
1222                 }
1223         }
1224         if (logptr) {
1225                 if (logptr->max_log > 0)
1226                         printf(" log logamount %d", logptr->max_log);
1227                 else
1228                         printf(" log");
1229         }
1230 #ifndef NO_ALTQ
1231         if (altqptr) {
1232                 print_altq_cmd(altqptr);
1233         }
1234 #endif
1235         if (tagptr) {
1236                 if (tagptr->len & F_NOT)
1237                         PRINT_UINT_ARG(" untag ", tagptr->arg1);
1238                 else
1239                         PRINT_UINT_ARG(" tag ", tagptr->arg1);
1240         }
1241
1242         /*
1243          * then print the body.
1244          */
1245         for (l = rule->act_ofs, cmd = rule->cmd ;
1246                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1247                 if ((cmd->len & F_OR) || (cmd->len & F_NOT))
1248                         continue;
1249                 if (cmd->opcode == O_IP4) {
1250                         flags |= HAVE_PROTO4;
1251                         break;
1252                 } else if (cmd->opcode == O_IP6) {
1253                         flags |= HAVE_PROTO6;
1254                         break;
1255                 }
1256         }
1257         if (rule->_pad & 1) {   /* empty rules before options */
1258                 if (!co.do_compact) {
1259                         show_prerequisites(&flags, HAVE_PROTO, 0);
1260                         printf(" from any to any");
1261                 }
1262                 flags |= HAVE_IP | HAVE_OPTIONS | HAVE_PROTO |
1263                          HAVE_SRCIP | HAVE_DSTIP;
1264         }
1265
1266         if (co.comment_only)
1267                 comment = "...";
1268
1269         for (l = rule->act_ofs, cmd = rule->cmd ;
1270                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
1271                 /* useful alias */
1272                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
1273
1274                 if (co.comment_only) {
1275                         if (cmd->opcode != O_NOP)
1276                                 continue;
1277                         printf(" // %s\n", (char *)(cmd + 1));
1278                         return;
1279                 }
1280
1281                 show_prerequisites(&flags, 0, cmd->opcode);
1282
1283                 switch(cmd->opcode) {
1284                 case O_PROB:
1285                         break;  /* done already */
1286
1287                 case O_PROBE_STATE:
1288                         break; /* no need to print anything here */
1289
1290                 case O_IP_SRC:
1291                 case O_IP_SRC_LOOKUP:
1292                 case O_IP_SRC_MASK:
1293                 case O_IP_SRC_ME:
1294                 case O_IP_SRC_SET:
1295                         show_prerequisites(&flags, HAVE_PROTO, 0);
1296                         if (!(flags & HAVE_SRCIP))
1297                                 printf(" from");
1298                         if ((cmd->len & F_OR) && !or_block)
1299                                 printf(" {");
1300                         print_ip((ipfw_insn_ip *)cmd,
1301                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1302                         flags |= HAVE_SRCIP;
1303                         break;
1304
1305                 case O_IP_DST:
1306                 case O_IP_DST_LOOKUP:
1307                 case O_IP_DST_MASK:
1308                 case O_IP_DST_ME:
1309                 case O_IP_DST_SET:
1310                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1311                         if (!(flags & HAVE_DSTIP))
1312                                 printf(" to");
1313                         if ((cmd->len & F_OR) && !or_block)
1314                                 printf(" {");
1315                         print_ip((ipfw_insn_ip *)cmd,
1316                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1317                         flags |= HAVE_DSTIP;
1318                         break;
1319
1320                 case O_IP6_SRC:
1321                 case O_IP6_SRC_MASK:
1322                 case O_IP6_SRC_ME:
1323                         show_prerequisites(&flags, HAVE_PROTO, 0);
1324                         if (!(flags & HAVE_SRCIP))
1325                                 printf(" from");
1326                         if ((cmd->len & F_OR) && !or_block)
1327                                 printf(" {");
1328                         print_ip6((ipfw_insn_ip6 *)cmd,
1329                             (flags & HAVE_OPTIONS) ? " src-ip6" : "");
1330                         flags |= HAVE_SRCIP | HAVE_PROTO;
1331                         break;
1332
1333                 case O_IP6_DST:
1334                 case O_IP6_DST_MASK:
1335                 case O_IP6_DST_ME:
1336                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1337                         if (!(flags & HAVE_DSTIP))
1338                                 printf(" to");
1339                         if ((cmd->len & F_OR) && !or_block)
1340                                 printf(" {");
1341                         print_ip6((ipfw_insn_ip6 *)cmd,
1342                             (flags & HAVE_OPTIONS) ? " dst-ip6" : "");
1343                         flags |= HAVE_DSTIP;
1344                         break;
1345
1346                 case O_FLOW6ID:
1347                 print_flow6id( (ipfw_insn_u32 *) cmd );
1348                 flags |= HAVE_OPTIONS;
1349                 break;
1350
1351                 case O_IP_DSTPORT:
1352                         show_prerequisites(&flags,
1353                                 HAVE_PROTO | HAVE_SRCIP |
1354                                 HAVE_DSTIP | HAVE_IP, 0);
1355                 case O_IP_SRCPORT:
1356                         if (flags & HAVE_DSTIP)
1357                                 flags |= HAVE_IP;
1358                         show_prerequisites(&flags,
1359                                 HAVE_PROTO | HAVE_SRCIP, 0);
1360                         if ((cmd->len & F_OR) && !or_block)
1361                                 printf(" {");
1362                         if (cmd->len & F_NOT)
1363                                 printf(" not");
1364                         print_newports((ipfw_insn_u16 *)cmd, proto,
1365                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1366                         break;
1367
1368                 case O_PROTO: {
1369                         struct protoent *pe = NULL;
1370
1371                         if ((cmd->len & F_OR) && !or_block)
1372                                 printf(" {");
1373                         if (cmd->len & F_NOT)
1374                                 printf(" not");
1375                         proto = cmd->arg1;
1376                         pe = getprotobynumber(cmd->arg1);
1377                         if ((flags & (HAVE_PROTO4 | HAVE_PROTO6)) &&
1378                             !(flags & HAVE_PROTO))
1379                                 show_prerequisites(&flags,
1380                                     HAVE_PROTO | HAVE_IP | HAVE_SRCIP |
1381                                     HAVE_DSTIP | HAVE_OPTIONS, 0);
1382                         if (flags & HAVE_OPTIONS)
1383                                 printf(" proto");
1384                         if (pe)
1385                                 printf(" %s", pe->p_name);
1386                         else
1387                                 printf(" %u", cmd->arg1);
1388                         }
1389                         flags |= HAVE_PROTO;
1390                         break;
1391
1392                 default: /*options ... */
1393                         if (!(cmd->len & (F_OR|F_NOT)))
1394                                 if (((cmd->opcode == O_IP6) &&
1395                                     (flags & HAVE_PROTO6)) ||
1396                                     ((cmd->opcode == O_IP4) &&
1397                                     (flags & HAVE_PROTO4)))
1398                                         break;
1399                         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP |
1400                                     HAVE_DSTIP | HAVE_IP | HAVE_OPTIONS, 0);
1401                         if ((cmd->len & F_OR) && !or_block)
1402                                 printf(" {");
1403                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1404                                 printf(" not");
1405                         switch(cmd->opcode) {
1406                         case O_MACADDR2: {
1407                                 ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1408
1409                                 printf(" MAC");
1410                                 print_mac(m->addr, m->mask);
1411                                 print_mac(m->addr + 6, m->mask + 6);
1412                                 }
1413                                 break;
1414
1415                         case O_MAC_TYPE:
1416                                 print_newports((ipfw_insn_u16 *)cmd,
1417                                                 IPPROTO_ETHERTYPE, cmd->opcode);
1418                                 break;
1419
1420
1421                         case O_FRAG:
1422                                 printf(" frag");
1423                                 break;
1424
1425                         case O_FIB:
1426                                 printf(" fib %u", cmd->arg1 );
1427                                 break;
1428                         case O_SOCKARG:
1429                                 printf(" sockarg");
1430                                 break;
1431
1432                         case O_IN:
1433                                 printf(cmd->len & F_NOT ? " out" : " in");
1434                                 break;
1435
1436                         case O_DIVERTED:
1437                                 switch (cmd->arg1) {
1438                                 case 3:
1439                                         printf(" diverted");
1440                                         break;
1441                                 case 1:
1442                                         printf(" diverted-loopback");
1443                                         break;
1444                                 case 2:
1445                                         printf(" diverted-output");
1446                                         break;
1447                                 default:
1448                                         printf(" diverted-?<%u>", cmd->arg1);
1449                                         break;
1450                                 }
1451                                 break;
1452
1453                         case O_LAYER2:
1454                                 printf(" layer2");
1455                                 break;
1456                         case O_XMIT:
1457                         case O_RECV:
1458                         case O_VIA:
1459                             {
1460                                 char const *s;
1461                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1462
1463                                 if (cmd->opcode == O_XMIT)
1464                                         s = "xmit";
1465                                 else if (cmd->opcode == O_RECV)
1466                                         s = "recv";
1467                                 else /* if (cmd->opcode == O_VIA) */
1468                                         s = "via";
1469                                 if (cmdif->name[0] == '\0')
1470                                         printf(" %s %s", s,
1471                                             inet_ntoa(cmdif->p.ip));
1472                                 else if (cmdif->name[0] == '\1') /* interface table */
1473                                         printf(" %s table(%d)", s, cmdif->p.glob);
1474                                 else
1475                                         printf(" %s %s", s, cmdif->name);
1476
1477                                 break;
1478                             }
1479                         case O_IPID:
1480                                 if (F_LEN(cmd) == 1)
1481                                     printf(" ipid %u", cmd->arg1 );
1482                                 else
1483                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1484                                         O_IPID);
1485                                 break;
1486
1487                         case O_IPTTL:
1488                                 if (F_LEN(cmd) == 1)
1489                                     printf(" ipttl %u", cmd->arg1 );
1490                                 else
1491                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1492                                         O_IPTTL);
1493                                 break;
1494
1495                         case O_IPVER:
1496                                 printf(" ipver %u", cmd->arg1 );
1497                                 break;
1498
1499                         case O_IPPRECEDENCE:
1500                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1501                                 break;
1502
1503                         case O_IPLEN:
1504                                 if (F_LEN(cmd) == 1)
1505                                     printf(" iplen %u", cmd->arg1 );
1506                                 else
1507                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1508                                         O_IPLEN);
1509                                 break;
1510
1511                         case O_IPOPT:
1512                                 print_flags("ipoptions", cmd, f_ipopts);
1513                                 break;
1514
1515                         case O_IPTOS:
1516                                 print_flags("iptos", cmd, f_iptos);
1517                                 break;
1518
1519                         case O_ICMPTYPE:
1520                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1521                                 break;
1522
1523                         case O_ESTAB:
1524                                 printf(" established");
1525                                 break;
1526
1527                         case O_TCPDATALEN:
1528                                 if (F_LEN(cmd) == 1)
1529                                     printf(" tcpdatalen %u", cmd->arg1 );
1530                                 else
1531                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1532                                         O_TCPDATALEN);
1533                                 break;
1534
1535                         case O_TCPFLAGS:
1536                                 print_flags("tcpflags", cmd, f_tcpflags);
1537                                 break;
1538
1539                         case O_TCPOPTS:
1540                                 print_flags("tcpoptions", cmd, f_tcpopts);
1541                                 break;
1542
1543                         case O_TCPWIN:
1544                                 if (F_LEN(cmd) == 1)
1545                                     printf(" tcpwin %u", cmd->arg1);
1546                                 else
1547                                     print_newports((ipfw_insn_u16 *)cmd, 0,
1548                                         O_TCPWIN);
1549                                 break;
1550
1551                         case O_TCPACK:
1552                                 printf(" tcpack %d", ntohl(cmd32->d[0]));
1553                                 break;
1554
1555                         case O_TCPSEQ:
1556                                 printf(" tcpseq %d", ntohl(cmd32->d[0]));
1557                                 break;
1558
1559                         case O_UID:
1560                             {
1561                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1562
1563                                 if (pwd)
1564                                         printf(" uid %s", pwd->pw_name);
1565                                 else
1566                                         printf(" uid %u", cmd32->d[0]);
1567                             }
1568                                 break;
1569
1570                         case O_GID:
1571                             {
1572                                 struct group *grp = getgrgid(cmd32->d[0]);
1573
1574                                 if (grp)
1575                                         printf(" gid %s", grp->gr_name);
1576                                 else
1577                                         printf(" gid %u", cmd32->d[0]);
1578                             }
1579                                 break;
1580
1581                         case O_JAIL:
1582                                 printf(" jail %d", cmd32->d[0]);
1583                                 break;
1584
1585                         case O_VERREVPATH:
1586                                 printf(" verrevpath");
1587                                 break;
1588
1589                         case O_VERSRCREACH:
1590                                 printf(" versrcreach");
1591                                 break;
1592
1593                         case O_ANTISPOOF:
1594                                 printf(" antispoof");
1595                                 break;
1596
1597                         case O_IPSEC:
1598                                 printf(" ipsec");
1599                                 break;
1600
1601                         case O_NOP:
1602                                 comment = (char *)(cmd + 1);
1603                                 break;
1604
1605                         case O_KEEP_STATE:
1606                                 printf(" keep-state");
1607                                 break;
1608
1609                         case O_LIMIT: {
1610                                 struct _s_x *p = limit_masks;
1611                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1612                                 uint8_t x = c->limit_mask;
1613                                 char const *comma = " ";
1614
1615                                 printf(" limit");
1616                                 for (; p->x != 0 ; p++)
1617                                         if ((x & p->x) == p->x) {
1618                                                 x &= ~p->x;
1619                                                 printf("%s%s", comma, p->s);
1620                                                 comma = ",";
1621                                         }
1622                                 PRINT_UINT_ARG(" ", c->conn_limit);
1623                                 break;
1624                         }
1625
1626                         case O_IP6:
1627                                 printf(" ip6");
1628                                 break;
1629
1630                         case O_IP4:
1631                                 printf(" ip4");
1632                                 break;
1633
1634                         case O_ICMP6TYPE:
1635                                 print_icmp6types((ipfw_insn_u32 *)cmd);
1636                                 break;
1637
1638                         case O_EXT_HDR:
1639                                 print_ext6hdr( (ipfw_insn *) cmd );
1640                                 break;
1641
1642                         case O_TAGGED:
1643                                 if (F_LEN(cmd) == 1)
1644                                         PRINT_UINT_ARG(" tagged ", cmd->arg1);
1645                                 else
1646                                         print_newports((ipfw_insn_u16 *)cmd, 0,
1647                                             O_TAGGED);
1648                                 break;
1649
1650                         default:
1651                                 printf(" [opcode %d len %d]",
1652                                     cmd->opcode, cmd->len);
1653                         }
1654                 }
1655                 if (cmd->len & F_OR) {
1656                         printf(" or");
1657                         or_block = 1;
1658                 } else if (or_block) {
1659                         printf(" }");
1660                         or_block = 0;
1661                 }
1662         }
1663         show_prerequisites(&flags, HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP
1664                                               | HAVE_IP, 0);
1665         if (comment)
1666                 printf(" // %s", comment);
1667         printf("\n");
1668 }
1669
1670 static void
1671 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1672 {
1673         struct protoent *pe;
1674         struct in_addr a;
1675         uint16_t rulenum;
1676         char buf[INET6_ADDRSTRLEN];
1677
1678         if (!co.do_expired) {
1679                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1680                         return;
1681         }
1682         bcopy(&d->rule, &rulenum, sizeof(rulenum));
1683         printf("%05d", rulenum);
1684         if (pcwidth > 0 || bcwidth > 0) {
1685                 printf(" ");
1686                 pr_u64(&d->pcnt, pcwidth);
1687                 pr_u64(&d->bcnt, bcwidth);
1688                 printf("(%ds)", d->expire);
1689         }
1690         switch (d->dyn_type) {
1691         case O_LIMIT_PARENT:
1692                 printf(" PARENT %d", d->count);
1693                 break;
1694         case O_LIMIT:
1695                 printf(" LIMIT");
1696                 break;
1697         case O_KEEP_STATE: /* bidir, no mask */
1698                 printf(" STATE");
1699                 break;
1700         }
1701
1702         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1703                 printf(" %s", pe->p_name);
1704         else
1705                 printf(" proto %u", d->id.proto);
1706
1707         if (d->id.addr_type == 4) {
1708                 a.s_addr = htonl(d->id.src_ip);
1709                 printf(" %s %d", inet_ntoa(a), d->id.src_port);
1710
1711                 a.s_addr = htonl(d->id.dst_ip);
1712                 printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1713         } else if (d->id.addr_type == 6) {
1714                 printf(" %s %d", inet_ntop(AF_INET6, &d->id.src_ip6, buf,
1715                     sizeof(buf)), d->id.src_port);
1716                 printf(" <-> %s %d", inet_ntop(AF_INET6, &d->id.dst_ip6, buf,
1717                     sizeof(buf)), d->id.dst_port);
1718         } else
1719                 printf(" UNKNOWN <-> UNKNOWN\n");
1720
1721         printf("\n");
1722 }
1723
1724 /*
1725  * This one handles all set-related commands
1726  *      ipfw set { show | enable | disable }
1727  *      ipfw set swap X Y
1728  *      ipfw set move X to Y
1729  *      ipfw set move rule X to Y
1730  */
1731 void
1732 ipfw_sets_handler(char *av[])
1733 {
1734         uint32_t set_disable, masks[2];
1735         int i, nbytes;
1736         uint16_t rulenum;
1737         uint8_t cmd, new_set;
1738
1739         av++;
1740
1741         if (av[0] == NULL)
1742                 errx(EX_USAGE, "set needs command");
1743         if (_substrcmp(*av, "show") == 0) {
1744                 void *data = NULL;
1745                 char const *msg;
1746                 int nalloc;
1747
1748                 nalloc = nbytes = sizeof(struct ip_fw);
1749                 while (nbytes >= nalloc) {
1750                         if (data)
1751                                 free(data);
1752                         nalloc = nalloc * 2 + 200;
1753                         nbytes = nalloc;
1754                         data = safe_calloc(1, nbytes);
1755                         if (do_cmd(IP_FW_GET, data, (uintptr_t)&nbytes) < 0)
1756                                 err(EX_OSERR, "getsockopt(IP_FW_GET)");
1757                 }
1758
1759                 bcopy(&((struct ip_fw *)data)->next_rule,
1760                         &set_disable, sizeof(set_disable));
1761
1762                 for (i = 0, msg = "disable" ; i < RESVD_SET; i++)
1763                         if ((set_disable & (1<<i))) {
1764                                 printf("%s %d", msg, i);
1765                                 msg = "";
1766                         }
1767                 msg = (set_disable) ? " enable" : "enable";
1768                 for (i = 0; i < RESVD_SET; i++)
1769                         if (!(set_disable & (1<<i))) {
1770                                 printf("%s %d", msg, i);
1771                                 msg = "";
1772                         }
1773                 printf("\n");
1774         } else if (_substrcmp(*av, "swap") == 0) {
1775                 av++;
1776                 if ( av[0] == NULL || av[1] == NULL )
1777                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1778                 rulenum = atoi(av[0]);
1779                 new_set = atoi(av[1]);
1780                 if (!isdigit(*(av[0])) || rulenum > RESVD_SET)
1781                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1782                 if (!isdigit(*(av[1])) || new_set > RESVD_SET)
1783                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1784                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1785                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1786         } else if (_substrcmp(*av, "move") == 0) {
1787                 av++;
1788                 if (av[0] && _substrcmp(*av, "rule") == 0) {
1789                         cmd = 2;
1790                         av++;
1791                 } else
1792                         cmd = 3;
1793                 if (av[0] == NULL || av[1] == NULL || av[2] == NULL ||
1794                                 av[3] != NULL ||  _substrcmp(av[1], "to") != 0)
1795                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1796                 rulenum = atoi(av[0]);
1797                 new_set = atoi(av[2]);
1798                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > RESVD_SET) ||
1799                         (cmd == 2 && rulenum == IPFW_DEFAULT_RULE) )
1800                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1801                 if (!isdigit(*(av[2])) || new_set > RESVD_SET)
1802                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1803                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1804                 i = do_cmd(IP_FW_DEL, masks, sizeof(uint32_t));
1805         } else if (_substrcmp(*av, "disable") == 0 ||
1806                    _substrcmp(*av, "enable") == 0 ) {
1807                 int which = _substrcmp(*av, "enable") == 0 ? 1 : 0;
1808
1809                 av++;
1810                 masks[0] = masks[1] = 0;
1811
1812                 while (av[0]) {
1813                         if (isdigit(**av)) {
1814                                 i = atoi(*av);
1815                                 if (i < 0 || i > RESVD_SET)
1816                                         errx(EX_DATAERR,
1817                                             "invalid set number %d\n", i);
1818                                 masks[which] |= (1<<i);
1819                         } else if (_substrcmp(*av, "disable") == 0)
1820                                 which = 0;
1821                         else if (_substrcmp(*av, "enable") == 0)
1822                                 which = 1;
1823                         else
1824                                 errx(EX_DATAERR,
1825                                         "invalid set command %s\n", *av);
1826                         av++;
1827                 }
1828                 if ( (masks[0] & masks[1]) != 0 )
1829                         errx(EX_DATAERR,
1830                             "cannot enable and disable the same set\n");
1831
1832                 i = do_cmd(IP_FW_DEL, masks, sizeof(masks));
1833                 if (i)
1834                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1835         } else
1836                 errx(EX_USAGE, "invalid set command %s\n", *av);
1837 }
1838
1839 void
1840 ipfw_sysctl_handler(char *av[], int which)
1841 {
1842         av++;
1843
1844         if (av[0] == NULL) {
1845                 warnx("missing keyword to enable/disable\n");
1846         } else if (_substrcmp(*av, "firewall") == 0) {
1847                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1848                     &which, sizeof(which));
1849                 sysctlbyname("net.inet6.ip6.fw.enable", NULL, 0,
1850                     &which, sizeof(which));
1851         } else if (_substrcmp(*av, "one_pass") == 0) {
1852                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1853                     &which, sizeof(which));
1854         } else if (_substrcmp(*av, "debug") == 0) {
1855                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1856                     &which, sizeof(which));
1857         } else if (_substrcmp(*av, "verbose") == 0) {
1858                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1859                     &which, sizeof(which));
1860         } else if (_substrcmp(*av, "dyn_keepalive") == 0) {
1861                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1862                     &which, sizeof(which));
1863 #ifndef NO_ALTQ
1864         } else if (_substrcmp(*av, "altq") == 0) {
1865                 altq_set_enabled(which);
1866 #endif
1867         } else {
1868                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1869         }
1870 }
1871
1872 void
1873 ipfw_list(int ac, char *av[], int show_counters)
1874 {
1875         struct ip_fw *r;
1876         ipfw_dyn_rule *dynrules, *d;
1877
1878 #define NEXT(r) ((struct ip_fw *)((char *)r + RULESIZE(r)))
1879         char *lim;
1880         void *data = NULL;
1881         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1882         int exitval = EX_OK;
1883         int lac;
1884         char **lav;
1885         u_long rnum, last;
1886         char *endptr;
1887         int seen = 0;
1888         uint8_t set;
1889
1890         const int ocmd = co.do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1891         int nalloc = 1024;      /* start somewhere... */
1892
1893         last = 0;
1894
1895         if (co.test_only) {
1896                 fprintf(stderr, "Testing only, list disabled\n");
1897                 return;
1898         }
1899         if (co.do_pipe) {
1900                 dummynet_list(ac, av, show_counters);
1901                 return;
1902         }
1903
1904         ac--;
1905         av++;
1906
1907         /* get rules or pipes from kernel, resizing array as necessary */
1908         nbytes = nalloc;
1909
1910         while (nbytes >= nalloc) {
1911                 nalloc = nalloc * 2 + 200;
1912                 nbytes = nalloc;
1913                 data = safe_realloc(data, nbytes);
1914                 if (do_cmd(ocmd, data, (uintptr_t)&nbytes) < 0)
1915                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1916                                 co.do_pipe ? "DUMMYNET" : "FW");
1917         }
1918
1919         /*
1920          * Count static rules. They have variable size so we
1921          * need to scan the list to count them.
1922          */
1923         for (nstat = 1, r = data, lim = (char *)data + nbytes;
1924                     r->rulenum < IPFW_DEFAULT_RULE && (char *)r < lim;
1925                     ++nstat, r = NEXT(r) )
1926                 ; /* nothing */
1927
1928         /*
1929          * Count dynamic rules. This is easier as they have
1930          * fixed size.
1931          */
1932         r = NEXT(r);
1933         dynrules = (ipfw_dyn_rule *)r ;
1934         n = (char *)r - (char *)data;
1935         ndyn = (nbytes - n) / sizeof *dynrules;
1936
1937         /* if showing stats, figure out column widths ahead of time */
1938         bcwidth = pcwidth = 0;
1939         if (show_counters) {
1940                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1941                         /* skip rules from another set */
1942                         if (co.use_set && r->set != co.use_set - 1)
1943                                 continue;
1944
1945                         /* packet counter */
1946                         width = pr_u64(&r->pcnt, 0);
1947                         if (width > pcwidth)
1948                                 pcwidth = width;
1949
1950                         /* byte counter */
1951                         width = pr_u64(&r->bcnt, 0);
1952                         if (width > bcwidth)
1953                                 bcwidth = width;
1954                 }
1955         }
1956         if (co.do_dynamic && ndyn) {
1957                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1958                         if (co.use_set) {
1959                                 /* skip rules from another set */
1960                                 bcopy((char *)&d->rule + sizeof(uint16_t),
1961                                       &set, sizeof(uint8_t));
1962                                 if (set != co.use_set - 1)
1963                                         continue;
1964                         }
1965                         width = pr_u64(&d->pcnt, 0);
1966                         if (width > pcwidth)
1967                                 pcwidth = width;
1968
1969                         width = pr_u64(&d->bcnt, 0);
1970                         if (width > bcwidth)
1971                                 bcwidth = width;
1972                 }
1973         }
1974         /* if no rule numbers were specified, list all rules */
1975         if (ac == 0) {
1976                 for (n = 0, r = data; n < nstat; n++, r = NEXT(r)) {
1977                         if (co.use_set && r->set != co.use_set - 1)
1978                                 continue;
1979                         show_ipfw(r, pcwidth, bcwidth);
1980                 }
1981
1982                 if (co.do_dynamic && ndyn) {
1983                         printf("## Dynamic rules (%d):\n", ndyn);
1984                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1985                                 if (co.use_set) {
1986                                         bcopy((char *)&d->rule + sizeof(uint16_t),
1987                                               &set, sizeof(uint8_t));
1988                                         if (set != co.use_set - 1)
1989                                                 continue;
1990                                 }
1991                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1992                 }
1993                 }
1994                 goto done;
1995         }
1996
1997         /* display specific rules requested on command line */
1998
1999         for (lac = ac, lav = av; lac != 0; lac--) {
2000                 /* convert command line rule # */
2001                 last = rnum = strtoul(*lav++, &endptr, 10);
2002                 if (*endptr == '-')
2003                         last = strtoul(endptr+1, &endptr, 10);
2004                 if (*endptr) {
2005                         exitval = EX_USAGE;
2006                         warnx("invalid rule number: %s", *(lav - 1));
2007                         continue;
2008                 }
2009                 for (n = seen = 0, r = data; n < nstat; n++, r = NEXT(r) ) {
2010                         if (r->rulenum > last)
2011                                 break;
2012                         if (co.use_set && r->set != co.use_set - 1)
2013                                 continue;
2014                         if (r->rulenum >= rnum && r->rulenum <= last) {
2015                                 show_ipfw(r, pcwidth, bcwidth);
2016                                 seen = 1;
2017                         }
2018                 }
2019                 if (!seen) {
2020                         /* give precedence to other error(s) */
2021                         if (exitval == EX_OK)
2022                                 exitval = EX_UNAVAILABLE;
2023                         warnx("rule %lu does not exist", rnum);
2024                 }
2025         }
2026
2027         if (co.do_dynamic && ndyn) {
2028                 printf("## Dynamic rules:\n");
2029                 for (lac = ac, lav = av; lac != 0; lac--) {
2030                         last = rnum = strtoul(*lav++, &endptr, 10);
2031                         if (*endptr == '-')
2032                                 last = strtoul(endptr+1, &endptr, 10);
2033                         if (*endptr)
2034                                 /* already warned */
2035                                 continue;
2036                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
2037                                 uint16_t rulenum;
2038
2039                                 bcopy(&d->rule, &rulenum, sizeof(rulenum));
2040                                 if (rulenum > rnum)
2041                                         break;
2042                                 if (co.use_set) {
2043                                         bcopy((char *)&d->rule + sizeof(uint16_t),
2044                                               &set, sizeof(uint8_t));
2045                                         if (set != co.use_set - 1)
2046                                                 continue;
2047                                 }
2048                                 if (r->rulenum >= rnum && r->rulenum <= last)
2049                                         show_dyn_ipfw(d, pcwidth, bcwidth);
2050                         }
2051                 }
2052         }
2053
2054         ac = 0;
2055
2056 done:
2057         free(data);
2058
2059         if (exitval != EX_OK)
2060                 exit(exitval);
2061 #undef NEXT
2062 }
2063
2064 static int
2065 lookup_host (char *host, struct in_addr *ipaddr)
2066 {
2067         struct hostent *he;
2068
2069         if (!inet_aton(host, ipaddr)) {
2070                 if ((he = gethostbyname(host)) == NULL)
2071                         return(-1);
2072                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
2073         }
2074         return(0);
2075 }
2076
2077 /*
2078  * fills the addr and mask fields in the instruction as appropriate from av.
2079  * Update length as appropriate.
2080  * The following formats are allowed:
2081  *      me      returns O_IP_*_ME
2082  *      1.2.3.4         single IP address
2083  *      1.2.3.4:5.6.7.8 address:mask
2084  *      1.2.3.4/24      address/mask
2085  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
2086  * We can have multiple comma-separated address/mask entries.
2087  */
2088 static void
2089 fill_ip(ipfw_insn_ip *cmd, char *av, int cblen)
2090 {
2091         int len = 0;
2092         uint32_t *d = ((ipfw_insn_u32 *)cmd)->d;
2093
2094         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
2095
2096         if (_substrcmp(av, "any") == 0)
2097                 return;
2098
2099         if (_substrcmp(av, "me") == 0) {
2100                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2101                 return;
2102         }
2103
2104         if (strncmp(av, "table(", 6) == 0) {
2105                 char *p = strchr(av + 6, ',');
2106
2107                 if (p)
2108                         *p++ = '\0';
2109                 cmd->o.opcode = O_IP_DST_LOOKUP;
2110                 cmd->o.arg1 = strtoul(av + 6, NULL, 0);
2111                 if (p) {
2112                         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2113                         d[0] = strtoul(p, NULL, 0);
2114                 } else
2115                         cmd->o.len |= F_INSN_SIZE(ipfw_insn);
2116                 return;
2117         }
2118
2119     while (av) {
2120         /*
2121          * After the address we can have '/' or ':' indicating a mask,
2122          * ',' indicating another address follows, '{' indicating a
2123          * set of addresses of unspecified size.
2124          */
2125         char *t = NULL, *p = strpbrk(av, "/:,{");
2126         int masklen;
2127         char md, nd = '\0';
2128
2129         CHECK_LENGTH(cblen, F_INSN_SIZE(ipfw_insn) + 2 + len);
2130
2131         if (p) {
2132                 md = *p;
2133                 *p++ = '\0';
2134                 if ((t = strpbrk(p, ",{")) != NULL) {
2135                         nd = *t;
2136                         *t = '\0';
2137                 }
2138         } else
2139                 md = '\0';
2140
2141         if (lookup_host(av, (struct in_addr *)&d[0]) != 0)
2142                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
2143         switch (md) {
2144         case ':':
2145                 if (!inet_aton(p, (struct in_addr *)&d[1]))
2146                         errx(EX_DATAERR, "bad netmask ``%s''", p);
2147                 break;
2148         case '/':
2149                 masklen = atoi(p);
2150                 if (masklen == 0)
2151                         d[1] = htonl(0);        /* mask */
2152                 else if (masklen > 32)
2153                         errx(EX_DATAERR, "bad width ``%s''", p);
2154                 else
2155                         d[1] = htonl(~0 << (32 - masklen));
2156                 break;
2157         case '{':       /* no mask, assume /24 and put back the '{' */
2158                 d[1] = htonl(~0 << (32 - 24));
2159                 *(--p) = md;
2160                 break;
2161
2162         case ',':       /* single address plus continuation */
2163                 *(--p) = md;
2164                 /* FALLTHROUGH */
2165         case 0:         /* initialization value */
2166         default:
2167                 d[1] = htonl(~0);       /* force /32 */
2168                 break;
2169         }
2170         d[0] &= d[1];           /* mask base address with mask */
2171         if (t)
2172                 *t = nd;
2173         /* find next separator */
2174         if (p)
2175                 p = strpbrk(p, ",{");
2176         if (p && *p == '{') {
2177                 /*
2178                  * We have a set of addresses. They are stored as follows:
2179                  *   arg1       is the set size (powers of 2, 2..256)
2180                  *   addr       is the base address IN HOST FORMAT
2181                  *   mask..     is an array of arg1 bits (rounded up to
2182                  *              the next multiple of 32) with bits set
2183                  *              for each host in the map.
2184                  */
2185                 uint32_t *map = (uint32_t *)&cmd->mask;
2186                 int low, high;
2187                 int i = contigmask((uint8_t *)&(d[1]), 32);
2188
2189                 if (len > 0)
2190                         errx(EX_DATAERR, "address set cannot be in a list");
2191                 if (i < 24 || i > 31)
2192                         errx(EX_DATAERR, "invalid set with mask %d\n", i);
2193                 cmd->o.arg1 = 1<<(32-i);        /* map length           */
2194                 d[0] = ntohl(d[0]);             /* base addr in host format */
2195                 cmd->o.opcode = O_IP_DST_SET;   /* default */
2196                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
2197                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
2198                         map[i] = 0;     /* clear map */
2199
2200                 av = p + 1;
2201                 low = d[0] & 0xff;
2202                 high = low + cmd->o.arg1 - 1;
2203                 /*
2204                  * Here, i stores the previous value when we specify a range
2205                  * of addresses within a mask, e.g. 45-63. i = -1 means we
2206                  * have no previous value.
2207                  */
2208                 i = -1; /* previous value in a range */
2209                 while (isdigit(*av)) {
2210                         char *s;
2211                         int a = strtol(av, &s, 0);
2212
2213                         if (s == av) { /* no parameter */
2214                             if (*av != '}')
2215                                 errx(EX_DATAERR, "set not closed\n");
2216                             if (i != -1)
2217                                 errx(EX_DATAERR, "incomplete range %d-", i);
2218                             break;
2219                         }
2220                         if (a < low || a > high)
2221                             errx(EX_DATAERR, "addr %d out of range [%d-%d]\n",
2222                                 a, low, high);
2223                         a -= low;
2224                         if (i == -1)    /* no previous in range */
2225                             i = a;
2226                         else {          /* check that range is valid */
2227                             if (i > a)
2228                                 errx(EX_DATAERR, "invalid range %d-%d",
2229                                         i+low, a+low);
2230                             if (*s == '-')
2231                                 errx(EX_DATAERR, "double '-' in range");
2232                         }
2233                         for (; i <= a; i++)
2234                             map[i/32] |= 1<<(i & 31);
2235                         i = -1;
2236                         if (*s == '-')
2237                             i = a;
2238                         else if (*s == '}')
2239                             break;
2240                         av = s+1;
2241                 }
2242                 return;
2243         }
2244         av = p;
2245         if (av)                 /* then *av must be a ',' */
2246                 av++;
2247
2248         /* Check this entry */
2249         if (d[1] == 0) { /* "any", specified as x.x.x.x/0 */
2250                 /*
2251                  * 'any' turns the entire list into a NOP.
2252                  * 'not any' never matches, so it is removed from the
2253                  * list unless it is the only item, in which case we
2254                  * report an error.
2255                  */
2256                 if (cmd->o.len & F_NOT) {       /* "not any" never matches */
2257                         if (av == NULL && len == 0) /* only this entry */
2258                                 errx(EX_DATAERR, "not any never matches");
2259                 }
2260                 /* else do nothing and skip this entry */
2261                 return;
2262         }
2263         /* A single IP can be stored in an optimized format */
2264         if (d[1] == (uint32_t)~0 && av == NULL && len == 0) {
2265                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
2266                 return;
2267         }
2268         len += 2;       /* two words... */
2269         d += 2;
2270     } /* end while */
2271     if (len + 1 > F_LEN_MASK)
2272         errx(EX_DATAERR, "address list too long");
2273     cmd->o.len |= len+1;
2274 }
2275
2276
2277 /* n2mask sets n bits of the mask */
2278 void
2279 n2mask(struct in6_addr *mask, int n)
2280 {
2281         static int      minimask[9] =
2282             { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
2283         u_char          *p;
2284
2285         memset(mask, 0, sizeof(struct in6_addr));
2286         p = (u_char *) mask;
2287         for (; n > 0; p++, n -= 8) {
2288                 if (n >= 8)
2289                         *p = 0xff;
2290                 else
2291                         *p = minimask[n];
2292         }
2293         return;
2294 }
2295
2296 /*
2297  * helper function to process a set of flags and set bits in the
2298  * appropriate masks.
2299  */
2300 static void
2301 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2302         struct _s_x *flags, char *p)
2303 {
2304         uint8_t set=0, clear=0;
2305
2306         while (p && *p) {
2307                 char *q;        /* points to the separator */
2308                 int val;
2309                 uint8_t *which; /* mask we are working on */
2310
2311                 if (*p == '!') {
2312                         p++;
2313                         which = &clear;
2314                 } else
2315                         which = &set;
2316                 q = strchr(p, ',');
2317                 if (q)
2318                         *q++ = '\0';
2319                 val = match_token(flags, p);
2320                 if (val <= 0)
2321                         errx(EX_DATAERR, "invalid flag %s", p);
2322                 *which |= (uint8_t)val;
2323                 p = q;
2324         }
2325         cmd->opcode = opcode;
2326         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2327         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2328 }
2329
2330
2331 void
2332 ipfw_delete(char *av[])
2333 {
2334         uint32_t rulenum;
2335         int i;
2336         int exitval = EX_OK;
2337         int do_set = 0;
2338
2339         av++;
2340         NEED1("missing rule specification");
2341         if ( *av && _substrcmp(*av, "set") == 0) {
2342                 /* Do not allow using the following syntax:
2343                  *      ipfw set N delete set M
2344                  */
2345                 if (co.use_set)
2346                         errx(EX_DATAERR, "invalid syntax");
2347                 do_set = 1;     /* delete set */
2348                 av++;
2349         }
2350
2351         /* Rule number */
2352         while (*av && isdigit(**av)) {
2353                 i = atoi(*av); av++;
2354                 if (co.do_nat) {
2355                         exitval = do_cmd(IP_FW_NAT_DEL, &i, sizeof i);
2356                         if (exitval) {
2357                                 exitval = EX_UNAVAILABLE;
2358                                 warn("rule %u not available", i);
2359                         }
2360                 } else if (co.do_pipe) {
2361                         exitval = ipfw_delete_pipe(co.do_pipe, i);
2362                 } else {
2363                         if (co.use_set)
2364                                 rulenum = (i & 0xffff) | (5 << 24) |
2365                                     ((co.use_set - 1) << 16);
2366                         else
2367                         rulenum =  (i & 0xffff) | (do_set << 24);
2368                         i = do_cmd(IP_FW_DEL, &rulenum, sizeof rulenum);
2369                         if (i) {
2370                                 exitval = EX_UNAVAILABLE;
2371                                 warn("rule %u: setsockopt(IP_FW_DEL)",
2372                                     rulenum);
2373                         }
2374                 }
2375         }
2376         if (exitval != EX_OK)
2377                 exit(exitval);
2378 }
2379
2380
2381 /*
2382  * fill the interface structure. We do not check the name as we can
2383  * create interfaces dynamically, so checking them at insert time
2384  * makes relatively little sense.
2385  * Interface names containing '*', '?', or '[' are assumed to be shell
2386  * patterns which match interfaces.
2387  */
2388 static void
2389 fill_iface(ipfw_insn_if *cmd, char *arg, int cblen)
2390 {
2391         cmd->name[0] = '\0';
2392         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2393
2394         CHECK_CMDLEN;
2395
2396         /* Parse the interface or address */
2397         if (strcmp(arg, "any") == 0)
2398                 cmd->o.len = 0;         /* effectively ignore this command */
2399         else if (strncmp(arg, "table(", 6) == 0) {
2400                 char *p = strchr(arg + 6, ',');
2401                 if (p)
2402                         *p++ = '\0';
2403                 cmd->name[0] = '\1'; /* Special value indicating table */
2404                 cmd->p.glob = strtoul(arg + 6, NULL, 0);
2405         } else if (!isdigit(*arg)) {
2406                 strlcpy(cmd->name, arg, sizeof(cmd->name));
2407                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2408         } else if (!inet_aton(arg, &cmd->p.ip))
2409                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
2410 }
2411
2412 static void
2413 get_mac_addr_mask(const char *p, uint8_t *addr, uint8_t *mask)
2414 {
2415         int i;
2416         size_t l;
2417         char *ap, *ptr, *optr;
2418         struct ether_addr *mac;
2419         const char *macset = "0123456789abcdefABCDEF:";
2420
2421         if (strcmp(p, "any") == 0) {
2422                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2423                         addr[i] = mask[i] = 0;
2424                 return;
2425         }
2426
2427         optr = ptr = strdup(p);
2428         if ((ap = strsep(&ptr, "&/")) != NULL && *ap != 0) {
2429                 l = strlen(ap);
2430                 if (strspn(ap, macset) != l || (mac = ether_aton(ap)) == NULL)
2431                         errx(EX_DATAERR, "Incorrect MAC address");
2432                 bcopy(mac, addr, ETHER_ADDR_LEN);
2433         } else
2434                 errx(EX_DATAERR, "Incorrect MAC address");
2435
2436         if (ptr != NULL) { /* we have mask? */
2437                 if (p[ptr - optr - 1] == '/') { /* mask len */
2438                         long ml = strtol(ptr, &ap, 10);
2439                         if (*ap != 0 || ml > ETHER_ADDR_LEN * 8 || ml < 0)
2440                                 errx(EX_DATAERR, "Incorrect mask length");
2441                         for (i = 0; ml > 0 && i < ETHER_ADDR_LEN; ml -= 8, i++)
2442                                 mask[i] = (ml >= 8) ? 0xff: (~0) << (8 - ml);
2443                 } else { /* mask */
2444                         l = strlen(ptr);
2445                         if (strspn(ptr, macset) != l ||
2446                             (mac = ether_aton(ptr)) == NULL)
2447                                 errx(EX_DATAERR, "Incorrect mask");
2448                         bcopy(mac, mask, ETHER_ADDR_LEN);
2449                 }
2450         } else { /* default mask: ff:ff:ff:ff:ff:ff */
2451                 for (i = 0; i < ETHER_ADDR_LEN; i++)
2452                         mask[i] = 0xff;
2453         }
2454         for (i = 0; i < ETHER_ADDR_LEN; i++)
2455                 addr[i] &= mask[i];
2456
2457         free(optr);
2458 }
2459
2460 /*
2461  * helper function, updates the pointer to cmd with the length
2462  * of the current command, and also cleans up the first word of
2463  * the new command in case it has been clobbered before.
2464  */
2465 static ipfw_insn *
2466 next_cmd(ipfw_insn *cmd, int *len)
2467 {
2468         *len -= F_LEN(cmd);
2469         CHECK_LENGTH(*len, 0);
2470         cmd += F_LEN(cmd);
2471         bzero(cmd, sizeof(*cmd));
2472         return cmd;
2473 }
2474
2475 /*
2476  * Takes arguments and copies them into a comment
2477  */
2478 static void
2479 fill_comment(ipfw_insn *cmd, char **av, int cblen)
2480 {
2481         int i, l;
2482         char *p = (char *)(cmd + 1);
2483
2484         cmd->opcode = O_NOP;
2485         cmd->len =  (cmd->len & (F_NOT | F_OR));
2486
2487         /* Compute length of comment string. */
2488         for (i = 0, l = 0; av[i] != NULL; i++)
2489                 l += strlen(av[i]) + 1;
2490         if (l == 0)
2491                 return;
2492         if (l > 84)
2493                 errx(EX_DATAERR,
2494                     "comment too long (max 80 chars)");
2495         l = 1 + (l+3)/4;
2496         cmd->len =  (cmd->len & (F_NOT | F_OR)) | l;
2497         CHECK_CMDLEN;
2498
2499         for (i = 0; av[i] != NULL; i++) {
2500                 strcpy(p, av[i]);
2501                 p += strlen(av[i]);
2502                 *p++ = ' ';
2503         }
2504         *(--p) = '\0';
2505 }
2506
2507 /*
2508  * A function to fill simple commands of size 1.
2509  * Existing flags are preserved.
2510  */
2511 static void
2512 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, uint16_t arg)
2513 {
2514         cmd->opcode = opcode;
2515         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2516         cmd->arg1 = arg;
2517 }
2518
2519 /*
2520  * Fetch and add the MAC address and type, with masks. This generates one or
2521  * two microinstructions, and returns the pointer to the last one.
2522  */
2523 static ipfw_insn *
2524 add_mac(ipfw_insn *cmd, char *av[], int cblen)
2525 {
2526         ipfw_insn_mac *mac;
2527
2528         if ( ( av[0] == NULL ) || ( av[1] == NULL ) )
2529                 errx(EX_DATAERR, "MAC dst src");
2530
2531         cmd->opcode = O_MACADDR2;
2532         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2533         CHECK_CMDLEN;
2534
2535         mac = (ipfw_insn_mac *)cmd;
2536         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2537         get_mac_addr_mask(av[1], &(mac->addr[ETHER_ADDR_LEN]),
2538             &(mac->mask[ETHER_ADDR_LEN])); /* src */
2539         return cmd;
2540 }
2541
2542 static ipfw_insn *
2543 add_mactype(ipfw_insn *cmd, char *av, int cblen)
2544 {
2545         if (!av)
2546                 errx(EX_DATAERR, "missing MAC type");
2547         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2548                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE,
2549                     cblen);
2550                 cmd->opcode = O_MAC_TYPE;
2551                 return cmd;
2552         } else
2553                 return NULL;
2554 }
2555
2556 static ipfw_insn *
2557 add_proto0(ipfw_insn *cmd, char *av, u_char *protop)
2558 {
2559         struct protoent *pe;
2560         char *ep;
2561         int proto;
2562
2563         proto = strtol(av, &ep, 10);
2564         if (*ep != '\0' || proto <= 0) {
2565                 if ((pe = getprotobyname(av)) == NULL)
2566                         return NULL;
2567                 proto = pe->p_proto;
2568         }
2569
2570         fill_cmd(cmd, O_PROTO, 0, proto);
2571         *protop = proto;
2572         return cmd;
2573 }
2574
2575 static ipfw_insn *
2576 add_proto(ipfw_insn *cmd, char *av, u_char *protop)
2577 {
2578         u_char proto = IPPROTO_IP;
2579
2580         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2581                 ; /* do not set O_IP4 nor O_IP6 */
2582         else if (strcmp(av, "ip4") == 0)
2583                 /* explicit "just IPv4" rule */
2584                 fill_cmd(cmd, O_IP4, 0, 0);
2585         else if (strcmp(av, "ip6") == 0) {
2586                 /* explicit "just IPv6" rule */
2587                 proto = IPPROTO_IPV6;
2588                 fill_cmd(cmd, O_IP6, 0, 0);
2589         } else
2590                 return add_proto0(cmd, av, protop);
2591
2592         *protop = proto;
2593         return cmd;
2594 }
2595
2596 static ipfw_insn *
2597 add_proto_compat(ipfw_insn *cmd, char *av, u_char *protop)
2598 {
2599         u_char proto = IPPROTO_IP;
2600
2601         if (_substrcmp(av, "all") == 0 || strcmp(av, "ip") == 0)
2602                 ; /* do not set O_IP4 nor O_IP6 */
2603         else if (strcmp(av, "ipv4") == 0 || strcmp(av, "ip4") == 0)
2604                 /* explicit "just IPv4" rule */
2605                 fill_cmd(cmd, O_IP4, 0, 0);
2606         else if (strcmp(av, "ipv6") == 0 || strcmp(av, "ip6") == 0) {
2607                 /* explicit "just IPv6" rule */
2608                 proto = IPPROTO_IPV6;
2609                 fill_cmd(cmd, O_IP6, 0, 0);
2610         } else
2611                 return add_proto0(cmd, av, protop);
2612
2613         *protop = proto;
2614         return cmd;
2615 }
2616
2617 static ipfw_insn *
2618 add_srcip(ipfw_insn *cmd, char *av, int cblen)
2619 {
2620         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2621         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2622                 cmd->opcode = O_IP_SRC_SET;
2623         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2624                 cmd->opcode = O_IP_SRC_LOOKUP;
2625         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2626                 cmd->opcode = O_IP_SRC_ME;
2627         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2628                 cmd->opcode = O_IP_SRC;
2629         else                                                    /* addr/mask */
2630                 cmd->opcode = O_IP_SRC_MASK;
2631         return cmd;
2632 }
2633
2634 static ipfw_insn *
2635 add_dstip(ipfw_insn *cmd, char *av, int cblen)
2636 {
2637         fill_ip((ipfw_insn_ip *)cmd, av, cblen);
2638         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2639                 ;
2640         else if (cmd->opcode == O_IP_DST_LOOKUP)                /* table */
2641                 ;
2642         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2643                 cmd->opcode = O_IP_DST_ME;
2644         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2645                 cmd->opcode = O_IP_DST;
2646         else                                                    /* addr/mask */
2647                 cmd->opcode = O_IP_DST_MASK;
2648         return cmd;
2649 }
2650
2651 static ipfw_insn *
2652 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode, int cblen)
2653 {
2654         /* XXX "any" is trapped before. Perhaps "to" */
2655         if (_substrcmp(av, "any") == 0) {
2656                 return NULL;
2657         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto, cblen)) {
2658                 /* XXX todo: check that we have a protocol with ports */
2659                 cmd->opcode = opcode;
2660                 return cmd;
2661         }
2662         return NULL;
2663 }
2664
2665 static ipfw_insn *
2666 add_src(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2667 {
2668         struct in6_addr a;
2669         char *host, *ch;
2670         ipfw_insn *ret = NULL;
2671
2672         if ((host = strdup(av)) == NULL)
2673                 return NULL;
2674         if ((ch = strrchr(host, '/')) != NULL)
2675                 *ch = '\0';
2676
2677         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2678             inet_pton(AF_INET6, host, &a) == 1)
2679                 ret = add_srcip6(cmd, av, cblen);
2680         /* XXX: should check for IPv4, not !IPv6 */
2681         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2682             inet_pton(AF_INET6, host, &a) != 1))
2683                 ret = add_srcip(cmd, av, cblen);
2684         if (ret == NULL && strcmp(av, "any") != 0)
2685                 ret = cmd;
2686
2687         free(host);
2688         return ret;
2689 }
2690
2691 static ipfw_insn *
2692 add_dst(ipfw_insn *cmd, char *av, u_char proto, int cblen)
2693 {
2694         struct in6_addr a;
2695         char *host, *ch;
2696         ipfw_insn *ret = NULL;
2697
2698         if ((host = strdup(av)) == NULL)
2699                 return NULL;
2700         if ((ch = strrchr(host, '/')) != NULL)
2701                 *ch = '\0';
2702
2703         if (proto == IPPROTO_IPV6  || strcmp(av, "me6") == 0 ||
2704             inet_pton(AF_INET6, host, &a) == 1)
2705                 ret = add_dstip6(cmd, av, cblen);
2706         /* XXX: should check for IPv4, not !IPv6 */
2707         if (ret == NULL && (proto == IPPROTO_IP || strcmp(av, "me") == 0 ||
2708             inet_pton(AF_INET6, host, &a) != 1))
2709                 ret = add_dstip(cmd, av, cblen);
2710         if (ret == NULL && strcmp(av, "any") != 0)
2711                 ret = cmd;
2712
2713         free(host);
2714         return ret;
2715 }
2716
2717 /*
2718  * Parse arguments and assemble the microinstructions which make up a rule.
2719  * Rules are added into the 'rulebuf' and then copied in the correct order
2720  * into the actual rule.
2721  *
2722  * The syntax for a rule starts with the action, followed by
2723  * optional action parameters, and the various match patterns.
2724  * In the assembled microcode, the first opcode must be an O_PROBE_STATE
2725  * (generated if the rule includes a keep-state option), then the
2726  * various match patterns, log/altq actions, and the actual action.
2727  *
2728  */
2729 void
2730 ipfw_add(char *av[])
2731 {
2732         /*
2733          * rules are added into the 'rulebuf' and then copied in
2734          * the correct order into the actual rule.
2735          * Some things that need to go out of order (prob, action etc.)
2736          * go into actbuf[].
2737          */
2738         static uint32_t rulebuf[255], actbuf[255], cmdbuf[255];
2739         int rblen, ablen, cblen;
2740
2741         ipfw_insn *src, *dst, *cmd, *action, *prev=NULL;
2742         ipfw_insn *first_cmd;   /* first match pattern */
2743
2744         struct ip_fw *rule;
2745
2746         /*
2747          * various flags used to record that we entered some fields.
2748          */
2749         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2750         ipfw_insn *have_log = NULL, *have_altq = NULL, *have_tag = NULL;
2751         size_t len;
2752
2753         int i;
2754
2755         int open_par = 0;       /* open parenthesis ( */
2756
2757         /* proto is here because it is used to fetch ports */
2758         u_char proto = IPPROTO_IP;      /* default protocol */
2759
2760         double match_prob = 1; /* match probability, default is always match */
2761
2762         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2763         bzero(cmdbuf, sizeof(cmdbuf));
2764         bzero(rulebuf, sizeof(rulebuf));
2765
2766         rule = (struct ip_fw *)rulebuf;
2767         cmd = (ipfw_insn *)cmdbuf;
2768         action = (ipfw_insn *)actbuf;
2769
2770         rblen = sizeof(rulebuf) / sizeof(rulebuf[0]);
2771         rblen -= offsetof(struct ip_fw, cmd) / sizeof(rulebuf[0]);
2772         ablen = sizeof(actbuf) / sizeof(actbuf[0]);
2773         cblen = sizeof(cmdbuf) / sizeof(cmdbuf[0]);
2774         cblen -= F_INSN_SIZE(ipfw_insn_u32) + 1;
2775
2776 #define CHECK_RBUFLEN(len)      { CHECK_LENGTH(rblen, len); rblen -= len; }
2777 #define CHECK_ACTLEN            CHECK_LENGTH(ablen, action->len)
2778
2779         av++;
2780
2781         /* [rule N]     -- Rule number optional */
2782         if (av[0] && isdigit(**av)) {
2783                 rule->rulenum = atoi(*av);
2784                 av++;
2785         }
2786
2787         /* [set N]      -- set number (0..RESVD_SET), optional */
2788         if (av[0] && av[1] && _substrcmp(*av, "set") == 0) {
2789                 int set = strtoul(av[1], NULL, 10);
2790                 if (set < 0 || set > RESVD_SET)
2791                         errx(EX_DATAERR, "illegal set %s", av[1]);
2792                 rule->set = set;
2793                 av += 2;
2794         }
2795
2796         /* [prob D]     -- match probability, optional */
2797         if (av[0] && av[1] && _substrcmp(*av, "prob") == 0) {
2798                 match_prob = strtod(av[1], NULL);
2799
2800                 if (match_prob <= 0 || match_prob > 1)
2801                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2802                 av += 2;
2803         }
2804
2805         /* action       -- mandatory */
2806         NEED1("missing action");
2807         i = match_token(rule_actions, *av);
2808         av++;
2809         action->len = 1;        /* default */
2810         CHECK_ACTLEN;
2811         switch(i) {
2812         case TOK_CHECKSTATE:
2813                 have_state = action;
2814                 action->opcode = O_CHECK_STATE;
2815                 break;
2816
2817         case TOK_ACCEPT:
2818                 action->opcode = O_ACCEPT;
2819                 break;
2820
2821         case TOK_DENY:
2822                 action->opcode = O_DENY;
2823                 action->arg1 = 0;
2824                 break;
2825
2826         case TOK_REJECT:
2827                 action->opcode = O_REJECT;
2828                 action->arg1 = ICMP_UNREACH_HOST;
2829                 break;
2830
2831         case TOK_RESET:
2832                 action->opcode = O_REJECT;
2833                 action->arg1 = ICMP_REJECT_RST;
2834                 break;
2835
2836         case TOK_RESET6:
2837                 action->opcode = O_UNREACH6;
2838                 action->arg1 = ICMP6_UNREACH_RST;
2839                 break;
2840
2841         case TOK_UNREACH:
2842                 action->opcode = O_REJECT;
2843                 NEED1("missing reject code");
2844                 fill_reject_code(&action->arg1, *av);
2845                 av++;
2846                 break;
2847
2848         case TOK_UNREACH6:
2849                 action->opcode = O_UNREACH6;
2850                 NEED1("missing unreach code");
2851                 fill_unreach6_code(&action->arg1, *av);
2852                 av++;
2853                 break;
2854
2855         case TOK_COUNT:
2856                 action->opcode = O_COUNT;
2857                 break;
2858
2859         case TOK_NAT:
2860                 action->opcode = O_NAT;
2861                 action->len = F_INSN_SIZE(ipfw_insn_nat);
2862                 CHECK_ACTLEN;
2863                 if (_substrcmp(*av, "global") == 0) {
2864                         action->arg1 = 0;
2865                         av++;
2866                         break;
2867                 } else
2868                         goto chkarg;
2869
2870         case TOK_QUEUE:
2871                 action->opcode = O_QUEUE;
2872                 goto chkarg;
2873         case TOK_PIPE:
2874                 action->opcode = O_PIPE;
2875                 goto chkarg;
2876         case TOK_SKIPTO:
2877                 action->opcode = O_SKIPTO;
2878                 goto chkarg;
2879         case TOK_NETGRAPH:
2880                 action->opcode = O_NETGRAPH;
2881                 goto chkarg;
2882         case TOK_NGTEE:
2883                 action->opcode = O_NGTEE;
2884                 goto chkarg;
2885         case TOK_DIVERT:
2886                 action->opcode = O_DIVERT;
2887                 goto chkarg;
2888         case TOK_TEE:
2889                 action->opcode = O_TEE;
2890                 goto chkarg;
2891         case TOK_CALL:
2892                 action->opcode = O_CALLRETURN;
2893 chkarg:
2894                 if (!av[0])
2895                         errx(EX_USAGE, "missing argument for %s", *(av - 1));
2896                 if (isdigit(**av)) {
2897                         action->arg1 = strtoul(*av, NULL, 10);
2898                         if (action->arg1 <= 0 || action->arg1 >= IP_FW_TABLEARG)
2899                                 errx(EX_DATAERR, "illegal argument for %s",
2900                                     *(av - 1));
2901                 } else if (_substrcmp(*av, "tablearg") == 0) {
2902                         action->arg1 = IP_FW_TABLEARG;
2903                 } else if (i == TOK_DIVERT || i == TOK_TEE) {
2904                         struct servent *s;
2905                         setservent(1);
2906                         s = getservbyname(av[0], "divert");
2907                         if (s != NULL)
2908                                 action->arg1 = ntohs(s->s_port);
2909                         else
2910                                 errx(EX_DATAERR, "illegal divert/tee port");
2911                 } else
2912                         errx(EX_DATAERR, "illegal argument for %s", *(av - 1));
2913                 av++;
2914                 break;
2915
2916         case TOK_FORWARD: {
2917                 /*
2918                  * Locate the address-port separator (':' or ',').
2919                  * Could be one of the following:
2920                  *      hostname:port
2921                  *      IPv4 a.b.c.d,port
2922                  *      IPv4 a.b.c.d:port
2923                  *      IPv6 w:x:y::z,port
2924                  * The ':' can only be used with hostname and IPv4 address.
2925                  * XXX-BZ Should we also support [w:x:y::z]:port?
2926                  */
2927                 struct sockaddr_storage result;
2928                 struct addrinfo *res;
2929                 char *s, *end;
2930                 int family;
2931                 u_short port_number;
2932
2933                 NEED1("missing forward address[:port]");
2934
2935                 /*
2936                  * locate the address-port separator (':' or ',')
2937                  */
2938                 s = strchr(*av, ',');
2939                 if (s == NULL) {
2940                         /* Distinguish between IPv4:port and IPv6 cases. */
2941                         s = strchr(*av, ':');
2942                         if (s && strchr(s+1, ':'))
2943                                 s = NULL; /* no port */
2944                 }
2945
2946                 port_number = 0;
2947                 if (s != NULL) {
2948                         /* Terminate host portion and set s to start of port. */
2949                         *(s++) = '\0';
2950                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2951                         if (s == end)
2952                                 errx(EX_DATAERR,
2953                                     "illegal forwarding port ``%s''", s);
2954                         port_number = (u_short)i;
2955                 }
2956
2957                 if (_substrcmp(*av, "tablearg") == 0) {
2958                         family = PF_INET;
2959                         ((struct sockaddr_in*)&result)->sin_addr.s_addr =
2960                             INADDR_ANY;
2961                 } else {
2962                         /*
2963                          * Resolve the host name or address to a family and a
2964                          * network representation of the address.
2965                          */
2966                         if (getaddrinfo(*av, NULL, NULL, &res))
2967                                 errx(EX_DATAERR, NULL);
2968                         /* Just use the first host in the answer. */
2969                         family = res->ai_family;
2970                         memcpy(&result, res->ai_addr, res->ai_addrlen);
2971                         freeaddrinfo(res);
2972                 }
2973
2974                 if (family == PF_INET) {
2975                         ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2976
2977                         action->opcode = O_FORWARD_IP;
2978                         action->len = F_INSN_SIZE(ipfw_insn_sa);
2979                         CHECK_ACTLEN;
2980
2981                         /*
2982                          * In the kernel we assume AF_INET and use only
2983                          * sin_port and sin_addr. Remember to set sin_len as
2984                          * the routing code seems to use it too.
2985                          */
2986                         p->sa.sin_len = sizeof(struct sockaddr_in);
2987                         p->sa.sin_family = AF_INET;
2988                         p->sa.sin_port = port_number;
2989                         p->sa.sin_addr.s_addr =
2990                              ((struct sockaddr_in *)&result)->sin_addr.s_addr;
2991                 } else if (family == PF_INET6) {
2992                         ipfw_insn_sa6 *p = (ipfw_insn_sa6 *)action;
2993
2994                         action->opcode = O_FORWARD_IP6;
2995                         action->len = F_INSN_SIZE(ipfw_insn_sa6);
2996                         CHECK_ACTLEN;
2997
2998                         p->sa.sin6_len = sizeof(struct sockaddr_in6);
2999                         p->sa.sin6_family = AF_INET6;
3000                         p->sa.sin6_port = port_number;
3001                         p->sa.sin6_flowinfo = 0;
3002                         p->sa.sin6_scope_id = 0;
3003                         /* No table support for v6 yet. */
3004                         bcopy(&((struct sockaddr_in6*)&result)->sin6_addr,
3005                             &p->sa.sin6_addr, sizeof(p->sa.sin6_addr));
3006                 } else {
3007                         errx(EX_DATAERR, "Invalid address family in forward action");
3008                 }
3009                 av++;
3010                 break;
3011             }
3012         case TOK_COMMENT:
3013                 /* pretend it is a 'count' rule followed by the comment */
3014                 action->opcode = O_COUNT;
3015                 av--;           /* go back... */
3016                 break;
3017
3018         case TOK_SETFIB:
3019             {
3020                 int numfibs;
3021                 size_t intsize = sizeof(int);
3022
3023                 action->opcode = O_SETFIB;
3024                 NEED1("missing fib number");
3025                 if (_substrcmp(*av, "tablearg") == 0) {
3026                         action->arg1 = IP_FW_TABLEARG;
3027                 } else {
3028                         action->arg1 = strtoul(*av, NULL, 10);
3029                         if (sysctlbyname("net.fibs", &numfibs, &intsize,
3030                             NULL, 0) == -1)
3031                                 errx(EX_DATAERR, "fibs not suported.\n");
3032                         if (action->arg1 >= numfibs)  /* Temporary */
3033                                 errx(EX_DATAERR, "fib too large.\n");
3034                 }
3035                 av++;
3036                 break;
3037             }
3038
3039         case TOK_REASS:
3040                 action->opcode = O_REASS;
3041                 break;
3042
3043         case TOK_RETURN:
3044                 fill_cmd(action, O_CALLRETURN, F_NOT, 0);
3045                 break;
3046
3047         default:
3048                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
3049         }
3050         action = next_cmd(action, &ablen);
3051
3052         /*
3053          * [altq queuename] -- altq tag, optional
3054          * [log [logamount N]]  -- log, optional
3055          *
3056          * If they exist, it go first in the cmdbuf, but then it is
3057          * skipped in the copy section to the end of the buffer.
3058          */
3059         while (av[0] != NULL && (i = match_token(rule_action_params, *av)) != -1) {
3060                 av++;
3061                 switch (i) {
3062                 case TOK_LOG:
3063                     {
3064                         ipfw_insn_log *c = (ipfw_insn_log *)cmd;
3065                         int l;
3066
3067                         if (have_log)
3068                                 errx(EX_DATAERR,
3069                                     "log cannot be specified more than once");
3070                         have_log = (ipfw_insn *)c;
3071                         cmd->len = F_INSN_SIZE(ipfw_insn_log);
3072                         CHECK_CMDLEN;
3073                         cmd->opcode = O_LOG;
3074                         if (av[0] && _substrcmp(*av, "logamount") == 0) {
3075                                 av++;
3076                                 NEED1("logamount requires argument");
3077                                 l = atoi(*av);
3078                                 if (l < 0)
3079                                         errx(EX_DATAERR,
3080                                             "logamount must be positive");
3081                                 c->max_log = l;
3082                                 av++;
3083                         } else {
3084                                 len = sizeof(c->max_log);
3085                                 if (sysctlbyname("net.inet.ip.fw.verbose_limit",
3086                                     &c->max_log, &len, NULL, 0) == -1)
3087                                         errx(1, "sysctlbyname(\"%s\")",
3088                                             "net.inet.ip.fw.verbose_limit");
3089                         }
3090                     }
3091                         break;
3092
3093 #ifndef NO_ALTQ
3094                 case TOK_ALTQ:
3095                     {
3096                         ipfw_insn_altq *a = (ipfw_insn_altq *)cmd;
3097
3098                         NEED1("missing altq queue name");
3099                         if (have_altq)
3100                                 errx(EX_DATAERR,
3101                                     "altq cannot be specified more than once");
3102                         have_altq = (ipfw_insn *)a;
3103                         cmd->len = F_INSN_SIZE(ipfw_insn_altq);
3104                         CHECK_CMDLEN;
3105                         cmd->opcode = O_ALTQ;
3106                         a->qid = altq_name_to_qid(*av);
3107                         av++;
3108                     }
3109                         break;
3110 #endif
3111
3112                 case TOK_TAG:
3113                 case TOK_UNTAG: {
3114                         uint16_t tag;
3115
3116                         if (have_tag)
3117                                 errx(EX_USAGE, "tag and untag cannot be "
3118                                     "specified more than once");
3119                         GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX, i,
3120                            rule_action_params);
3121                         have_tag = cmd;
3122                         fill_cmd(cmd, O_TAG, (i == TOK_TAG) ? 0: F_NOT, tag);
3123                         av++;
3124                         break;
3125                 }
3126
3127                 default:
3128                         abort();
3129                 }
3130                 cmd = next_cmd(cmd, &cblen);
3131         }
3132
3133         if (have_state) /* must be a check-state, we are done */
3134                 goto done;
3135
3136 #define OR_START(target)                                        \
3137         if (av[0] && (*av[0] == '(' || *av[0] == '{')) {        \
3138                 if (open_par)                                   \
3139                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
3140                 prev = NULL;                                    \
3141                 open_par = 1;                                   \
3142                 if ( (av[0])[1] == '\0') {                      \
3143                         av++;                                   \
3144                 } else                                          \
3145                         (*av)++;                                \
3146         }                                                       \
3147         target:                                                 \
3148
3149
3150 #define CLOSE_PAR                                               \
3151         if (open_par) {                                         \
3152                 if (av[0] && (                                  \
3153                     strcmp(*av, ")") == 0 ||                    \
3154                     strcmp(*av, "}") == 0)) {                   \
3155                         prev = NULL;                            \
3156                         open_par = 0;                           \
3157                         av++;                                   \
3158                 } else                                          \
3159                         errx(EX_USAGE, "missing \")\"\n");      \
3160         }
3161
3162 #define NOT_BLOCK                                               \
3163         if (av[0] && _substrcmp(*av, "not") == 0) {             \
3164                 if (cmd->len & F_NOT)                           \
3165                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
3166                 cmd->len |= F_NOT;                              \
3167                 av++;                                           \
3168         }
3169
3170 #define OR_BLOCK(target)                                        \
3171         if (av[0] && _substrcmp(*av, "or") == 0) {              \
3172                 if (prev == NULL || open_par == 0)              \
3173                         errx(EX_DATAERR, "invalid OR block");   \
3174                 prev->len |= F_OR;                              \
3175                 av++;                                   \
3176                 goto target;                                    \
3177         }                                                       \
3178         CLOSE_PAR;
3179
3180         first_cmd = cmd;
3181
3182 #if 0
3183         /*
3184          * MAC addresses, optional.
3185          * If we have this, we skip the part "proto from src to dst"
3186          * and jump straight to the option parsing.
3187          */
3188         NOT_BLOCK;
3189         NEED1("missing protocol");
3190         if (_substrcmp(*av, "MAC") == 0 ||
3191             _substrcmp(*av, "mac") == 0) {
3192                 av++;                   /* the "MAC" keyword */
3193                 add_mac(cmd, av);       /* exits in case of errors */
3194                 cmd = next_cmd(cmd);
3195                 av += 2;                /* dst-mac and src-mac */
3196                 NOT_BLOCK;
3197                 NEED1("missing mac type");
3198                 if (add_mactype(cmd, av[0]))
3199                         cmd = next_cmd(cmd);
3200                 av++;                   /* any or mac-type */
3201                 goto read_options;
3202         }
3203 #endif
3204
3205         /*
3206          * protocol, mandatory
3207          */
3208     OR_START(get_proto);
3209         NOT_BLOCK;
3210         NEED1("missing protocol");
3211         if (add_proto_compat(cmd, *av, &proto)) {
3212                 av++;
3213                 if (F_LEN(cmd) != 0) {
3214                         prev = cmd;
3215                         cmd = next_cmd(cmd, &cblen);
3216                 }
3217         } else if (first_cmd != cmd) {
3218                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3219         } else
3220                 goto read_options;
3221     OR_BLOCK(get_proto);
3222
3223         /*
3224          * "from", mandatory
3225          */
3226         if ((av[0] == NULL) || _substrcmp(*av, "from") != 0)
3227                 errx(EX_USAGE, "missing ``from''");
3228         av++;
3229
3230         /*
3231          * source IP, mandatory
3232          */
3233     OR_START(source_ip);
3234         NOT_BLOCK;      /* optional "not" */
3235         NEED1("missing source address");
3236         if (add_src(cmd, *av, proto, cblen)) {
3237                 av++;
3238                 if (F_LEN(cmd) != 0) {  /* ! any */
3239                         prev = cmd;
3240                         cmd = next_cmd(cmd, &cblen);
3241                 }
3242         } else
3243                 errx(EX_USAGE, "bad source address %s", *av);
3244     OR_BLOCK(source_ip);
3245
3246         /*
3247          * source ports, optional
3248          */
3249         NOT_BLOCK;      /* optional "not" */
3250         if ( av[0] != NULL ) {
3251                 if (_substrcmp(*av, "any") == 0 ||
3252                     add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3253                         av++;
3254                         if (F_LEN(cmd) != 0)
3255                                 cmd = next_cmd(cmd, &cblen);
3256                 }
3257         }
3258
3259         /*
3260          * "to", mandatory
3261          */
3262         if ( (av[0] == NULL) || _substrcmp(*av, "to") != 0 )
3263                 errx(EX_USAGE, "missing ``to''");
3264         av++;
3265
3266         /*
3267          * destination, mandatory
3268          */
3269     OR_START(dest_ip);
3270         NOT_BLOCK;      /* optional "not" */
3271         NEED1("missing dst address");
3272         if (add_dst(cmd, *av, proto, cblen)) {
3273                 av++;
3274                 if (F_LEN(cmd) != 0) {  /* ! any */
3275                         prev = cmd;
3276                         cmd = next_cmd(cmd, &cblen);
3277                 }
3278         } else
3279                 errx( EX_USAGE, "bad destination address %s", *av);
3280     OR_BLOCK(dest_ip);
3281
3282         /*
3283          * dest. ports, optional
3284          */
3285         NOT_BLOCK;      /* optional "not" */
3286         if (av[0]) {
3287                 if (_substrcmp(*av, "any") == 0 ||
3288                     add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3289                         av++;
3290                         if (F_LEN(cmd) != 0)
3291                                 cmd = next_cmd(cmd, &cblen);
3292                 }
3293         }
3294
3295 read_options:
3296         if (av[0] && first_cmd == cmd) {
3297                 /*
3298                  * nothing specified so far, store in the rule to ease
3299                  * printout later.
3300                  */
3301                  rule->_pad = 1;
3302         }
3303         prev = NULL;
3304         while ( av[0] != NULL ) {
3305                 char *s;
3306                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
3307
3308                 s = *av;
3309                 cmd32 = (ipfw_insn_u32 *)cmd;
3310
3311                 if (*s == '!') {        /* alternate syntax for NOT */
3312                         if (cmd->len & F_NOT)
3313                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3314                         cmd->len = F_NOT;
3315                         s++;
3316                 }
3317                 i = match_token(rule_options, s);
3318                 av++;
3319                 switch(i) {
3320                 case TOK_NOT:
3321                         if (cmd->len & F_NOT)
3322                                 errx(EX_USAGE, "double \"not\" not allowed\n");
3323                         cmd->len = F_NOT;
3324                         break;
3325
3326                 case TOK_OR:
3327                         if (open_par == 0 || prev == NULL)
3328                                 errx(EX_USAGE, "invalid \"or\" block\n");
3329                         prev->len |= F_OR;
3330                         break;
3331
3332                 case TOK_STARTBRACE:
3333                         if (open_par)
3334                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
3335                         open_par = 1;
3336                         break;
3337
3338                 case TOK_ENDBRACE:
3339                         if (!open_par)
3340                                 errx(EX_USAGE, "+missing \")\"\n");
3341                         open_par = 0;
3342                         prev = NULL;
3343                         break;
3344
3345                 case TOK_IN:
3346                         fill_cmd(cmd, O_IN, 0, 0);
3347                         break;
3348
3349                 case TOK_OUT:
3350                         cmd->len ^= F_NOT; /* toggle F_NOT */
3351                         fill_cmd(cmd, O_IN, 0, 0);
3352                         break;
3353
3354                 case TOK_DIVERTED:
3355                         fill_cmd(cmd, O_DIVERTED, 0, 3);
3356                         break;
3357
3358                 case TOK_DIVERTEDLOOPBACK:
3359                         fill_cmd(cmd, O_DIVERTED, 0, 1);
3360                         break;
3361
3362                 case TOK_DIVERTEDOUTPUT:
3363                         fill_cmd(cmd, O_DIVERTED, 0, 2);
3364                         break;
3365
3366                 case TOK_FRAG:
3367                         fill_cmd(cmd, O_FRAG, 0, 0);
3368                         break;
3369
3370                 case TOK_LAYER2:
3371                         fill_cmd(cmd, O_LAYER2, 0, 0);
3372                         break;
3373
3374                 case TOK_XMIT:
3375                 case TOK_RECV:
3376                 case TOK_VIA:
3377                         NEED1("recv, xmit, via require interface name"
3378                                 " or address");
3379                         fill_iface((ipfw_insn_if *)cmd, av[0], cblen);
3380                         av++;
3381                         if (F_LEN(cmd) == 0)    /* not a valid address */
3382                                 break;
3383                         if (i == TOK_XMIT)
3384                                 cmd->opcode = O_XMIT;
3385                         else if (i == TOK_RECV)
3386                                 cmd->opcode = O_RECV;
3387                         else if (i == TOK_VIA)
3388                                 cmd->opcode = O_VIA;
3389                         break;
3390
3391                 case TOK_ICMPTYPES:
3392                         NEED1("icmptypes requires list of types");
3393                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
3394                         av++;
3395                         break;
3396
3397                 case TOK_ICMP6TYPES:
3398                         NEED1("icmptypes requires list of types");
3399                         fill_icmp6types((ipfw_insn_icmp6 *)cmd, *av, cblen);
3400                         av++;
3401                         break;
3402
3403                 case TOK_IPTTL:
3404                         NEED1("ipttl requires TTL");
3405                         if (strpbrk(*av, "-,")) {
3406                             if (!add_ports(cmd, *av, 0, O_IPTTL, cblen))
3407                                 errx(EX_DATAERR, "invalid ipttl %s", *av);
3408                         } else
3409                             fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3410                         av++;
3411                         break;
3412
3413                 case TOK_IPID:
3414                         NEED1("ipid requires id");
3415                         if (strpbrk(*av, "-,")) {
3416                             if (!add_ports(cmd, *av, 0, O_IPID, cblen))
3417                                 errx(EX_DATAERR, "invalid ipid %s", *av);
3418                         } else
3419                             fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3420                         av++;
3421                         break;
3422
3423                 case TOK_IPLEN:
3424                         NEED1("iplen requires length");
3425                         if (strpbrk(*av, "-,")) {
3426                             if (!add_ports(cmd, *av, 0, O_IPLEN, cblen))
3427                                 errx(EX_DATAERR, "invalid ip len %s", *av);
3428                         } else
3429                             fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3430                         av++;
3431                         break;
3432
3433                 case TOK_IPVER:
3434                         NEED1("ipver requires version");
3435                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3436                         av++;
3437                         break;
3438
3439                 case TOK_IPPRECEDENCE:
3440                         NEED1("ipprecedence requires value");
3441                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
3442                             (strtoul(*av, NULL, 0) & 7) << 5);
3443                         av++;
3444                         break;
3445
3446                 case TOK_IPOPTS:
3447                         NEED1("missing argument for ipoptions");
3448                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3449                         av++;
3450                         break;
3451
3452                 case TOK_IPTOS:
3453                         NEED1("missing argument for iptos");
3454                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3455                         av++;
3456                         break;
3457
3458                 case TOK_UID:
3459                         NEED1("uid requires argument");
3460                     {
3461                         char *end;
3462                         uid_t uid;
3463                         struct passwd *pwd;
3464
3465                         cmd->opcode = O_UID;
3466                         uid = strtoul(*av, &end, 0);
3467                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3468                         if (pwd == NULL)
3469                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3470                         cmd32->d[0] = pwd->pw_uid;
3471                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3472                         av++;
3473                     }
3474                         break;
3475
3476                 case TOK_GID:
3477                         NEED1("gid requires argument");
3478                     {
3479                         char *end;
3480                         gid_t gid;
3481                         struct group *grp;
3482
3483                         cmd->opcode = O_GID;
3484                         gid = strtoul(*av, &end, 0);
3485                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3486                         if (grp == NULL)
3487                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3488                         cmd32->d[0] = grp->gr_gid;
3489                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3490                         av++;
3491                     }
3492                         break;
3493
3494                 case TOK_JAIL:
3495                         NEED1("jail requires argument");
3496                     {
3497                         char *end;
3498                         int jid;
3499
3500                         cmd->opcode = O_JAIL;
3501                         jid = (int)strtol(*av, &end, 0);
3502                         if (jid < 0 || *end != '\0')
3503                                 errx(EX_DATAERR, "jail requires prison ID");
3504                         cmd32->d[0] = (uint32_t)jid;
3505                         cmd->len |= F_INSN_SIZE(ipfw_insn_u32);
3506                         av++;
3507                     }
3508                         break;
3509
3510                 case TOK_ESTAB:
3511                         fill_cmd(cmd, O_ESTAB, 0, 0);
3512                         break;
3513
3514                 case TOK_SETUP:
3515                         fill_cmd(cmd, O_TCPFLAGS, 0,
3516                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3517                         break;
3518
3519                 case TOK_TCPDATALEN:
3520                         NEED1("tcpdatalen requires length");
3521                         if (strpbrk(*av, "-,")) {
3522                             if (!add_ports(cmd, *av, 0, O_TCPDATALEN, cblen))
3523                                 errx(EX_DATAERR, "invalid tcpdata len %s", *av);
3524                         } else
3525                             fill_cmd(cmd, O_TCPDATALEN, 0,
3526                                     strtoul(*av, NULL, 0));
3527                         av++;
3528                         break;
3529
3530                 case TOK_TCPOPTS:
3531                         NEED1("missing argument for tcpoptions");
3532                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3533                         av++;
3534                         break;
3535
3536                 case TOK_TCPSEQ:
3537                 case TOK_TCPACK:
3538                         NEED1("tcpseq/tcpack requires argument");
3539                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3540                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3541                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3542                         av++;
3543                         break;
3544
3545                 case TOK_TCPWIN:
3546                         NEED1("tcpwin requires length");
3547                         if (strpbrk(*av, "-,")) {
3548                             if (!add_ports(cmd, *av, 0, O_TCPWIN, cblen))
3549                                 errx(EX_DATAERR, "invalid tcpwin len %s", *av);
3550                         } else
3551                             fill_cmd(cmd, O_TCPWIN, 0,
3552                                     strtoul(*av, NULL, 0));
3553                         av++;
3554                         break;
3555
3556                 case TOK_TCPFLAGS:
3557                         NEED1("missing argument for tcpflags");
3558                         cmd->opcode = O_TCPFLAGS;
3559                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3560                         av++;
3561                         break;
3562
3563                 case TOK_KEEPSTATE:
3564                         if (open_par)
3565                                 errx(EX_USAGE, "keep-state cannot be part "
3566                                     "of an or block");
3567                         if (have_state)
3568                                 errx(EX_USAGE, "only one of keep-state "
3569                                         "and limit is allowed");
3570                         have_state = cmd;
3571                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3572                         break;
3573
3574                 case TOK_LIMIT: {
3575                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3576                         int val;
3577
3578                         if (open_par)
3579                                 errx(EX_USAGE,
3580                                     "limit cannot be part of an or block");
3581                         if (have_state)
3582                                 errx(EX_USAGE, "only one of keep-state and "
3583                                     "limit is allowed");
3584                         have_state = cmd;
3585
3586                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3587                         CHECK_CMDLEN;
3588                         cmd->opcode = O_LIMIT;
3589                         c->limit_mask = c->conn_limit = 0;
3590
3591                         while ( av[0] != NULL ) {
3592                                 if ((val = match_token(limit_masks, *av)) <= 0)
3593                                         break;
3594                                 c->limit_mask |= val;
3595                                 av++;
3596                         }
3597
3598                         if (c->limit_mask == 0)
3599                                 errx(EX_USAGE, "limit: missing limit mask");
3600
3601                         GET_UINT_ARG(c->conn_limit, IPFW_ARG_MIN, IPFW_ARG_MAX,
3602                             TOK_LIMIT, rule_options);
3603
3604                         av++;
3605                         break;
3606                 }
3607
3608                 case TOK_PROTO:
3609                         NEED1("missing protocol");
3610                         if (add_proto(cmd, *av, &proto)) {
3611                                 av++;
3612                         } else
3613                                 errx(EX_DATAERR, "invalid protocol ``%s''",
3614                                     *av);
3615                         break;
3616
3617                 case TOK_SRCIP:
3618                         NEED1("missing source IP");
3619                         if (add_srcip(cmd, *av, cblen)) {
3620                                 av++;
3621                         }
3622                         break;
3623
3624                 case TOK_DSTIP:
3625                         NEED1("missing destination IP");
3626                         if (add_dstip(cmd, *av, cblen)) {
3627                                 av++;
3628                         }
3629                         break;
3630
3631                 case TOK_SRCIP6:
3632                         NEED1("missing source IP6");
3633                         if (add_srcip6(cmd, *av, cblen)) {
3634                                 av++;
3635                         }
3636                         break;
3637
3638                 case TOK_DSTIP6:
3639                         NEED1("missing destination IP6");
3640                         if (add_dstip6(cmd, *av, cblen)) {
3641                                 av++;
3642                         }
3643                         break;
3644
3645                 case TOK_SRCPORT:
3646                         NEED1("missing source port");
3647                         if (_substrcmp(*av, "any") == 0 ||
3648                             add_ports(cmd, *av, proto, O_IP_SRCPORT, cblen)) {
3649                                 av++;
3650                         } else
3651                                 errx(EX_DATAERR, "invalid source port %s", *av);
3652                         break;
3653
3654                 case TOK_DSTPORT:
3655                         NEED1("missing destination port");
3656                         if (_substrcmp(*av, "any") == 0 ||
3657                             add_ports(cmd, *av, proto, O_IP_DSTPORT, cblen)) {
3658                                 av++;
3659                         } else
3660                                 errx(EX_DATAERR, "invalid destination port %s",
3661                                     *av);
3662                         break;
3663
3664                 case TOK_MAC:
3665                         if (add_mac(cmd, av, cblen))
3666                                 av += 2;
3667                         break;
3668
3669                 case TOK_MACTYPE:
3670                         NEED1("missing mac type");
3671                         if (!add_mactype(cmd, *av, cblen))
3672                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3673                         av++;
3674                         break;
3675
3676                 case TOK_VERREVPATH:
3677                         fill_cmd(cmd, O_VERREVPATH, 0, 0);
3678                         break;
3679
3680                 case TOK_VERSRCREACH:
3681                         fill_cmd(cmd, O_VERSRCREACH, 0, 0);
3682                         break;
3683
3684                 case TOK_ANTISPOOF:
3685                         fill_cmd(cmd, O_ANTISPOOF, 0, 0);
3686                         break;
3687
3688                 case TOK_IPSEC:
3689                         fill_cmd(cmd, O_IPSEC, 0, 0);
3690                         break;
3691
3692                 case TOK_IPV6:
3693                         fill_cmd(cmd, O_IP6, 0, 0);
3694                         break;
3695
3696                 case TOK_IPV4:
3697                         fill_cmd(cmd, O_IP4, 0, 0);
3698                         break;
3699
3700                 case TOK_EXT6HDR:
3701                         fill_ext6hdr( cmd, *av );
3702                         av++;
3703                         break;
3704
3705                 case TOK_FLOWID:
3706                         if (proto != IPPROTO_IPV6 )
3707                                 errx( EX_USAGE, "flow-id filter is active "
3708                                     "only for ipv6 protocol\n");
3709                         fill_flow6( (ipfw_insn_u32 *) cmd, *av, cblen);
3710                         av++;
3711                         break;
3712
3713                 case TOK_COMMENT:
3714                         fill_comment(cmd, av, cblen);
3715                         av[0]=NULL;
3716                         break;
3717
3718                 case TOK_TAGGED:
3719                         if (av[0] && strpbrk(*av, "-,")) {
3720                                 if (!add_ports(cmd, *av, 0, O_TAGGED, cblen))
3721                                         errx(EX_DATAERR, "tagged: invalid tag"
3722                                             " list: %s", *av);
3723                         }
3724                         else {
3725                                 uint16_t tag;
3726
3727                                 GET_UINT_ARG(tag, IPFW_ARG_MIN, IPFW_ARG_MAX,
3728                                     TOK_TAGGED, rule_options);
3729                                 fill_cmd(cmd, O_TAGGED, 0, tag);
3730                         }
3731                         av++;
3732                         break;
3733
3734                 case TOK_FIB:
3735                         NEED1("fib requires fib number");
3736                         fill_cmd(cmd, O_FIB, 0, strtoul(*av, NULL, 0));
3737                         av++;
3738                         break;
3739                 case TOK_SOCKARG:
3740                         fill_cmd(cmd, O_SOCKARG, 0, 0);
3741                         break;
3742
3743                 case TOK_LOOKUP: {
3744                         ipfw_insn_u32 *c = (ipfw_insn_u32 *)cmd;
3745                         char *p;
3746                         int j;
3747
3748                         if (!av[0] || !av[1])
3749                                 errx(EX_USAGE, "format: lookup argument tablenum");
3750                         cmd->opcode = O_IP_DST_LOOKUP;
3751                         cmd->len |= F_INSN_SIZE(ipfw_insn) + 2;
3752                         i = match_token(rule_options, *av);
3753                         for (j = 0; lookup_key[j] >= 0 ; j++) {
3754                                 if (i == lookup_key[j])
3755                                         break;
3756                         }
3757                         if (lookup_key[j] <= 0)
3758                                 errx(EX_USAGE, "format: cannot lookup on %s", *av);
3759                         __PAST_END(c->d, 1) = j; // i converted to option
3760                         av++;
3761                         cmd->arg1 = strtoul(*av, &p, 0);
3762                         if (p && *p)
3763                                 errx(EX_USAGE, "format: lookup argument tablenum");
3764                         av++;
3765                     }
3766                         break;
3767
3768                 default:
3769                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3770                 }
3771                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3772                         prev = cmd;
3773                         cmd = next_cmd(cmd, &cblen);
3774                 }
3775         }
3776
3777 done:
3778         /*
3779          * Now copy stuff into the rule.
3780          * If we have a keep-state option, the first instruction
3781          * must be a PROBE_STATE (which is generated here).
3782          * If we have a LOG option, it was stored as the first command,
3783          * and now must be moved to the top of the action part.
3784          */
3785         dst = (ipfw_insn *)rule->cmd;
3786
3787         /*
3788          * First thing to write into the command stream is the match probability.
3789          */
3790         if (match_prob != 1) { /* 1 means always match */
3791                 dst->opcode = O_PROB;
3792                 dst->len = 2;
3793                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3794                 dst += dst->len;
3795         }
3796
3797         /*
3798          * generate O_PROBE_STATE if necessary
3799          */
3800         if (have_state && have_state->opcode != O_CHECK_STATE) {
3801                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3802                 dst = next_cmd(dst, &rblen);
3803         }
3804
3805         /* copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_ALTQ, O_TAG */
3806         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3807                 i = F_LEN(src);
3808                 CHECK_RBUFLEN(i);
3809
3810                 switch (src->opcode) {
3811                 case O_LOG:
3812                 case O_KEEP_STATE:
3813                 case O_LIMIT:
3814                 case O_ALTQ:
3815                 case O_TAG:
3816                         break;
3817                 default:
3818                         bcopy(src, dst, i * sizeof(uint32_t));
3819                         dst += i;
3820                 }
3821         }
3822
3823         /*
3824          * put back the have_state command as last opcode
3825          */
3826         if (have_state && have_state->opcode != O_CHECK_STATE) {
3827                 i = F_LEN(have_state);
3828                 CHECK_RBUFLEN(i);
3829                 bcopy(have_state, dst, i * sizeof(uint32_t));
3830                 dst += i;
3831         }
3832         /*
3833          * start action section
3834          */
3835         rule->act_ofs = dst - rule->cmd;
3836
3837         /* put back O_LOG, O_ALTQ, O_TAG if necessary */
3838         if (have_log) {
3839                 i = F_LEN(have_log);
3840                 CHECK_RBUFLEN(i);
3841                 bcopy(have_log, dst, i * sizeof(uint32_t));
3842                 dst += i;
3843         }
3844         if (have_altq) {
3845                 i = F_LEN(have_altq);
3846                 CHECK_RBUFLEN(i);
3847                 bcopy(have_altq, dst, i * sizeof(uint32_t));
3848                 dst += i;
3849         }
3850         if (have_tag) {
3851                 i = F_LEN(have_tag);
3852                 CHECK_RBUFLEN(i);
3853                 bcopy(have_tag, dst, i * sizeof(uint32_t));
3854                 dst += i;
3855         }
3856
3857         /*
3858          * copy all other actions
3859          */
3860         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3861                 i = F_LEN(src);
3862                 CHECK_RBUFLEN(i);
3863                 bcopy(src, dst, i * sizeof(uint32_t));
3864                 dst += i;
3865         }
3866
3867         rule->cmd_len = (uint32_t *)dst - (uint32_t *)(rule->cmd);
3868         i = (char *)dst - (char *)rule;
3869         if (do_cmd(IP_FW_ADD, rule, (uintptr_t)&i) == -1)
3870                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3871         if (!co.do_quiet)
3872                 show_ipfw(rule, 0, 0);
3873 }
3874
3875 /*
3876  * clear the counters or the log counters.
3877  */
3878 void
3879 ipfw_zero(int ac, char *av[], int optname /* 0 = IP_FW_ZERO, 1 = IP_FW_RESETLOG */)
3880 {
3881         uint32_t arg, saved_arg;
3882         int failed = EX_OK;
3883         char const *errstr;
3884         char const *name = optname ? "RESETLOG" : "ZERO";
3885
3886         optname = optname ? IP_FW_RESETLOG : IP_FW_ZERO;
3887
3888         av++; ac--;
3889
3890         if (!ac) {
3891                 /* clear all entries */
3892                 if (do_cmd(optname, NULL, 0) < 0)
3893                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_%s)", name);
3894                 if (!co.do_quiet)
3895                         printf("%s.\n", optname == IP_FW_ZERO ?
3896                             "Accounting cleared":"Logging counts reset");
3897
3898                 return;
3899         }
3900
3901         while (ac) {
3902                 /* Rule number */
3903                 if (isdigit(**av)) {
3904                         arg = strtonum(*av, 0, 0xffff, &errstr);
3905                         if (errstr)
3906                                 errx(EX_DATAERR,
3907                                     "invalid rule number %s\n", *av);
3908                         saved_arg = arg;
3909                         if (co.use_set)
3910                                 arg |= (1 << 24) | ((co.use_set - 1) << 16);
3911                         av++;
3912                         ac--;
3913                         if (do_cmd(optname, &arg, sizeof(arg))) {
3914                                 warn("rule %u: setsockopt(IP_FW_%s)",
3915                                     saved_arg, name);
3916                                 failed = EX_UNAVAILABLE;
3917                         } else if (!co.do_quiet)
3918                                 printf("Entry %d %s.\n", saved_arg,
3919                                     optname == IP_FW_ZERO ?
3920                                         "cleared" : "logging count reset");
3921                 } else {
3922                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3923                 }
3924         }
3925         if (failed != EX_OK)
3926                 exit(failed);
3927 }
3928
3929 void
3930 ipfw_flush(int force)
3931 {
3932         int cmd = co.do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3933
3934         if (!force && !co.do_quiet) { /* need to ask user */
3935                 int c;
3936
3937                 printf("Are you sure? [yn] ");
3938                 fflush(stdout);
3939                 do {
3940                         c = toupper(getc(stdin));
3941                         while (c != '\n' && getc(stdin) != '\n')
3942                                 if (feof(stdin))
3943                                         return; /* and do not flush */
3944                 } while (c != 'Y' && c != 'N');
3945                 printf("\n");
3946                 if (c == 'N')   /* user said no */
3947                         return;
3948         }
3949         if (co.do_pipe) {
3950                 dummynet_flush();
3951                 return;
3952         }
3953         /* `ipfw set N flush` - is the same that `ipfw delete set N` */
3954         if (co.use_set) {
3955                 uint32_t arg = ((co.use_set - 1) & 0xffff) | (1 << 24);
3956                 if (do_cmd(IP_FW_DEL, &arg, sizeof(arg)) < 0)
3957                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_DEL)");
3958         } else if (do_cmd(cmd, NULL, 0) < 0)
3959                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3960                     co.do_pipe ? "DUMMYNET" : "FW");
3961         if (!co.do_quiet)
3962                 printf("Flushed all %s.\n", co.do_pipe ? "pipes" : "rules");
3963 }
3964
3965
3966 static void table_list(uint16_t num, int need_header);
3967 static void table_fill_xentry(char *arg, ipfw_table_xentry *xent);
3968
3969 /*
3970  * This one handles all table-related commands
3971  *      ipfw table N add addr[/masklen] [value]
3972  *      ipfw table N delete addr[/masklen]
3973  *      ipfw table {N | all} flush
3974  *      ipfw table {N | all} list
3975  */
3976 void
3977 ipfw_table_handler(int ac, char *av[])
3978 {
3979         ipfw_table_xentry xent;
3980         int do_add;
3981         int is_all;
3982         size_t len;
3983         uint32_t a, mask;
3984         uint32_t tables_max;
3985
3986         mask = 0;       // XXX uninitialized ?
3987         len = sizeof(tables_max);
3988         if (sysctlbyname("net.inet.ip.fw.tables_max", &tables_max, &len,
3989                 NULL, 0) == -1)
3990                 errx(1, "Can't determine maximum number of ipfw tables. "
3991                     "Perhaps you forgot to load ipfw module?");
3992
3993         memset(&xent, 0, sizeof(xent));
3994
3995         ac--; av++;
3996         if (ac && isdigit(**av)) {
3997                 xent.tbl = atoi(*av);
3998                 is_all = 0;
3999                 ac--; av++;
4000         } else if (ac && _substrcmp(*av, "all") == 0) {
4001                 xent.tbl = 0;
4002                 is_all = 1;
4003                 ac--; av++;
4004         } else
4005                 errx(EX_USAGE, "table number or 'all' keyword required");
4006         if (xent.tbl >= tables_max)
4007                 errx(EX_USAGE, "The table number exceeds the maximum allowed "
4008                         "value (%d)", tables_max - 1);
4009         NEED1("table needs command");
4010         if (is_all && _substrcmp(*av, "list") != 0
4011                    && _substrcmp(*av, "flush") != 0)
4012                 errx(EX_USAGE, "table number required");
4013
4014         if (_substrcmp(*av, "add") == 0 ||
4015             _substrcmp(*av, "delete") == 0) {
4016                 do_add = **av == 'a';
4017                 ac--; av++;
4018                 if (!ac)
4019                         errx(EX_USAGE, "address required");
4020
4021                 table_fill_xentry(*av, &xent);
4022
4023                 ac--; av++;
4024                 if (do_add && ac) {
4025                         unsigned int tval;
4026                         /* isdigit is a bit of a hack here.. */
4027                         if (strchr(*av, (int)'.') == NULL && isdigit(**av))  {
4028                                 xent.value = strtoul(*av, NULL, 0);
4029                         } else {
4030                                 if (lookup_host(*av, (struct in_addr *)&tval) == 0) {
4031                                         /* The value must be stored in host order        *
4032                                          * so that the values < 65k can be distinguished */
4033                                         xent.value = ntohl(tval);
4034                                 } else {
4035                                         errx(EX_NOHOST, "hostname ``%s'' unknown", *av);
4036                                 }
4037                         }
4038                 } else
4039                         xent.value = 0;
4040                 if (do_setcmd3(do_add ? IP_FW_TABLE_XADD : IP_FW_TABLE_XDEL,
4041                     &xent, xent.len) < 0) {
4042                         /* If running silent, don't bomb out on these errors. */
4043                         if (!(co.do_quiet && (errno == (do_add ? EEXIST : ESRCH))))
4044                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_%s)",
4045                                     do_add ? "XADD" : "XDEL");
4046                         /* In silent mode, react to a failed add by deleting */
4047                         if (do_add) {
4048                                 do_setcmd3(IP_FW_TABLE_XDEL, &xent, xent.len);
4049                                 if (do_setcmd3(IP_FW_TABLE_XADD, &xent, xent.len) < 0)
4050                                         err(EX_OSERR,
4051                                             "setsockopt(IP_FW_TABLE_XADD)");
4052                         }
4053                 }
4054         } else if (_substrcmp(*av, "flush") == 0) {
4055                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4056                 do {
4057                         if (do_cmd(IP_FW_TABLE_FLUSH, &xent.tbl,
4058                             sizeof(xent.tbl)) < 0)
4059                                 err(EX_OSERR, "setsockopt(IP_FW_TABLE_FLUSH)");
4060                 } while (++xent.tbl < a);
4061         } else if (_substrcmp(*av, "list") == 0) {
4062                 a = is_all ? tables_max : (uint32_t)(xent.tbl + 1);
4063                 do {
4064                         table_list(xent.tbl, is_all);
4065                 } while (++xent.tbl < a);
4066         } else
4067                 errx(EX_USAGE, "invalid table command %s", *av);
4068 }
4069
4070 static void
4071 table_fill_xentry(char *arg, ipfw_table_xentry *xent)
4072 {
4073         int addrlen, mask, masklen, type;
4074         struct in6_addr *paddr;
4075         uint32_t *pkey;
4076         char *p;
4077         uint32_t key;
4078
4079         mask = 0;
4080         type = 0;
4081         addrlen = 0;
4082         masklen = 0;
4083
4084         /*
4085          * Let's try to guess type by agrument.
4086          * Possible types:
4087          * 1) IPv4[/mask]
4088          * 2) IPv6[/mask]
4089          * 3) interface name
4090          * 4) port, uid/gid or other u32 key (base 10 format)
4091          * 5) hostname
4092          */
4093         paddr = &xent->k.addr6;
4094         if (ishexnumber(*arg) != 0 || *arg == ':') {
4095                 /* Remove / if exists */
4096                 if ((p = strchr(arg, '/')) != NULL) {
4097                         *p = '\0';
4098                         mask = atoi(p + 1);
4099                 }
4100
4101                 if (inet_pton(AF_INET, arg, paddr) == 1) {
4102                         if (p != NULL && mask > 32)
4103                                 errx(EX_DATAERR, "bad IPv4 mask width: %s",
4104                                     p + 1);
4105
4106                         type = IPFW_TABLE_CIDR;
4107                         masklen = p ? mask : 32;
4108                         addrlen = sizeof(struct in_addr);
4109                 } else if (inet_pton(AF_INET6, arg, paddr) == 1) {
4110                         if (IN6_IS_ADDR_V4COMPAT(paddr))
4111                                 errx(EX_DATAERR,
4112                                     "Use IPv4 instead of v4-compatible");
4113                         if (p != NULL && mask > 128)
4114                                 errx(EX_DATAERR, "bad IPv6 mask width: %s",
4115                                     p + 1);
4116
4117                         type = IPFW_TABLE_CIDR;
4118                         masklen = p ? mask : 128;
4119                         addrlen = sizeof(struct in6_addr);
4120                 } else {
4121                         /* Port or any other key */
4122                         key = strtol(arg, &p, 10);
4123                         /* Skip non-base 10 entries like 'fa1' */
4124                         if (p != arg) {
4125                                 pkey = (uint32_t *)paddr;
4126                                 *pkey = htonl(key);
4127                                 type = IPFW_TABLE_CIDR;
4128                                 addrlen = sizeof(uint32_t);
4129                         }
4130                 }
4131         }
4132
4133         if (type == 0 && strchr(arg, '.') == NULL) {
4134                 /* Assume interface name. Copy significant data only */
4135                 mask = MIN(strlen(arg), IF_NAMESIZE - 1);
4136                 memcpy(xent->k.iface, arg, mask);
4137                 /* Set mask to exact match */
4138                 masklen = 8 * IF_NAMESIZE;
4139                 type = IPFW_TABLE_INTERFACE;
4140                 addrlen = IF_NAMESIZE;
4141         }
4142
4143         if (type == 0) {
4144                 if (lookup_host(arg, (struct in_addr *)paddr) != 0)
4145                         errx(EX_NOHOST, "hostname ``%s'' unknown", arg);
4146
4147                 masklen = 32;
4148                 type = IPFW_TABLE_CIDR;
4149                 addrlen = sizeof(struct in_addr);
4150         }
4151
4152         xent->type = type;
4153         xent->masklen = masklen;
4154         xent->len = offsetof(ipfw_table_xentry, k) + addrlen;
4155 }
4156
4157 static void
4158 table_list(uint16_t num, int need_header)
4159 {
4160         ipfw_xtable *tbl;
4161         ipfw_table_xentry *xent;
4162         socklen_t l;
4163         uint32_t *a, sz, tval;
4164         char tbuf[128];
4165         struct in6_addr *addr6;
4166         ip_fw3_opheader *op3;
4167
4168         /* Prepend value with IP_FW3 header */
4169         l = sizeof(ip_fw3_opheader) + sizeof(uint32_t);
4170         op3 = alloca(l);
4171         /* Zero reserved fields */
4172         memset(op3, 0, sizeof(ip_fw3_opheader));
4173         a = (uint32_t *)(op3 + 1);
4174         *a = num;
4175         op3->opcode = IP_FW_TABLE_XGETSIZE;
4176         if (do_cmd(IP_FW3, op3, (uintptr_t)&l) < 0)
4177                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XGETSIZE)");
4178
4179         /* If a is zero we have nothing to do, the table is empty. */
4180         if (*a == 0)
4181                 return;
4182
4183         l = *a;
4184         tbl = safe_calloc(1, l);
4185         tbl->opheader.opcode = IP_FW_TABLE_XLIST;
4186         tbl->tbl = num;
4187         if (do_cmd(IP_FW3, tbl, (uintptr_t)&l) < 0)
4188                 err(EX_OSERR, "getsockopt(IP_FW_TABLE_XLIST)");
4189         if (tbl->cnt && need_header)
4190                 printf("---table(%d)---\n", tbl->tbl);
4191         sz = tbl->size - sizeof(ipfw_xtable);
4192         xent = &tbl->xent[0];
4193         while (sz > 0) {
4194                 switch (tbl->type) {
4195                 case IPFW_TABLE_CIDR:
4196                         /* IPv4 or IPv6 prefixes */
4197                         tval = xent->value;
4198                         addr6 = &xent->k.addr6;
4199
4200
4201                         if (IN6_IS_ADDR_V4COMPAT(addr6)) {
4202                                 /* IPv4 address */
4203                                 inet_ntop(AF_INET, &addr6->s6_addr32[3], tbuf, sizeof(tbuf));
4204                         } else {
4205                                 /* IPv6 address */
4206                                 inet_ntop(AF_INET6, addr6, tbuf, sizeof(tbuf));
4207                         }
4208
4209                         if (co.do_value_as_ip) {
4210                                 tval = htonl(tval);
4211                                 printf("%s/%u %s\n", tbuf, xent->masklen,
4212                                     inet_ntoa(*(struct in_addr *)&tval));
4213                         } else
4214                                 printf("%s/%u %u\n", tbuf, xent->masklen, tval);
4215                         break;
4216                 case IPFW_TABLE_INTERFACE:
4217                         /* Interface names */
4218                         tval = xent->value;
4219                         if (co.do_value_as_ip) {
4220                                 tval = htonl(tval);
4221                                 printf("%s %s\n", xent->k.iface,
4222                                     inet_ntoa(*(struct in_addr *)&tval));
4223                         } else
4224                                 printf("%s %u\n", xent->k.iface, tval);
4225                 }
4226
4227                 if (sz < xent->len)
4228                         break;
4229                 sz -= xent->len;
4230                 xent = (ipfw_table_xentry *)((char *)xent + xent->len);
4231         }
4232
4233         free(tbl);
4234 }