sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002 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: src/sbin/ipfw/ipfw2.c,v 1.4.2.13 2003/05/27 22:21:11 gshapiro Exp $
  21  * $DragonFly: src/sbin/ipfw/ipfw2.c,v 1.6 2004/12/18 21:43:38 swildner Exp $
  22  */
  23
  24 #include <sys/param.h>
  25 #include <sys/mbuf.h>
  26 #include <sys/socket.h>
  27 #include <sys/sockio.h>
  28 #include <sys/sysctl.h>
  29 #include <sys/time.h>
  30 #include <sys/wait.h>
  31
  32 #include <ctype.h>
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <grp.h>
  36 #include <limits.h>
  37 #include <netdb.h>
  38 #include <pwd.h>
  39 #include <signal.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <stdarg.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <sysexits.h>
  46
  47 #include <net/if.h>
  48 #include <netinet/in.h>
  49 #include <netinet/in_systm.h>
  50 #include <netinet/ip.h>
  51 #include <netinet/ip_icmp.h>
  52 #include <net/ipfw/ip_fw.h>
  53 #include <net/route.h> /* def. of struct route */
  54 #include <net/dummynet/ip_dummynet.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57
  58 int             s,                      /* main RAW socket */
  59                 do_resolv,              /* Would try to resolve all */
  60                 do_acct,                /* Show packet/byte count */
  61                 do_time,                /* Show time stamps */
  62                 do_quiet,               /* Be quiet in add and flush */
  63                 do_force,               /* Don't ask for confirmation */
  64                 do_pipe,                /* this cmd refers to a pipe */
  65                 do_sort,                /* field to sort results (0 = no) */
  66                 do_dynamic,             /* display dynamic rules */
  67                 do_expired,             /* display expired dynamic rules */
  68                 do_compact,             /* show rules in compact mode */
  69                 show_sets,              /* display rule sets */
  70                 verbose;
  71
  72 #define IP_MASK_ALL     0xffffffff
  73
  74 /*
  75  * structure to hold flag names and associated values to be
  76  * set in the appropriate masks.
  77  * A NULL string terminates the array.
  78  * Often, an element with 0 value contains an error string.
  79  *
  80  */
  81 struct _s_x {
  82         char *s;
  83         int x;
  84 };
  85
  86 static struct _s_x f_tcpflags[] = {
  87         { "syn", TH_SYN },
  88         { "fin", TH_FIN },
  89         { "ack", TH_ACK },
  90         { "psh", TH_PUSH },
  91         { "rst", TH_RST },
  92         { "urg", TH_URG },
  93         { "tcp flag", 0 },
  94         { NULL, 0 }
  95 };
  96
  97 static struct _s_x f_tcpopts[] = {
  98         { "mss",        IP_FW_TCPOPT_MSS },
  99         { "maxseg",     IP_FW_TCPOPT_MSS },
 100         { "window",     IP_FW_TCPOPT_WINDOW },
 101         { "sack",       IP_FW_TCPOPT_SACK },
 102         { "ts",         IP_FW_TCPOPT_TS },
 103         { "timestamp",  IP_FW_TCPOPT_TS },
 104         { "cc",         IP_FW_TCPOPT_CC },
 105         { "tcp option", 0 },
 106         { NULL, 0 }
 107 };
 108
 109 /*
 110  * IP options span the range 0 to 255 so we need to remap them
 111  * (though in fact only the low 5 bits are significant).
 112  */
 113 static struct _s_x f_ipopts[] = {
 114         { "ssrr",       IP_FW_IPOPT_SSRR},
 115         { "lsrr",       IP_FW_IPOPT_LSRR},
 116         { "rr",         IP_FW_IPOPT_RR},
 117         { "ts",         IP_FW_IPOPT_TS},
 118         { "ip option",  0 },
 119         { NULL, 0 }
 120 };
 121
 122 static struct _s_x f_iptos[] = {
 123         { "lowdelay",   IPTOS_LOWDELAY},
 124         { "throughput", IPTOS_THROUGHPUT},
 125         { "reliability", IPTOS_RELIABILITY},
 126         { "mincost",    IPTOS_MINCOST},
 127         { "congestion", IPTOS_CE},
 128         { "ecntransport", IPTOS_ECT},
 129         { "ip tos option", 0},
 130         { NULL, 0 }
 131 };
 132
 133 static struct _s_x limit_masks[] = {
 134         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 135         {"src-addr",    DYN_SRC_ADDR},
 136         {"src-port",    DYN_SRC_PORT},
 137         {"dst-addr",    DYN_DST_ADDR},
 138         {"dst-port",    DYN_DST_PORT},
 139         {NULL,          0}
 140 };
 141
 142 /*
 143  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 144  * This is only used in this code.
 145  */
 146 #define IPPROTO_ETHERTYPE       0x1000
 147 static struct _s_x ether_types[] = {
 148     /*
 149      * Note, we cannot use "-:&/" in the names because they are field
 150      * separators in the type specifications. Also, we use s = NULL as
 151      * end-delimiter, because a type of 0 can be legal.
 152      */
 153         { "ip",         0x0800 },
 154         { "ipv4",       0x0800 },
 155         { "ipv6",       0x86dd },
 156         { "arp",        0x0806 },
 157         { "rarp",       0x8035 },
 158         { "vlan",       0x8100 },
 159         { "loop",       0x9000 },
 160         { "trail",      0x1000 },
 161         { "at",         0x809b },
 162         { "atalk",      0x809b },
 163         { "aarp",       0x80f3 },
 164         { "pppoe_disc", 0x8863 },
 165         { "pppoe_sess", 0x8864 },
 166         { "ipx_8022",   0x00E0 },
 167         { "ipx_8023",   0x0000 },
 168         { "ipx_ii",     0x8137 },
 169         { "ipx_snap",   0x8137 },
 170         { "ipx",        0x8137 },
 171         { "ns",         0x0600 },
 172         { NULL,         0 }
 173 };
 174
 175 static void show_usage(void);
 176
 177 enum tokens {
 178         TOK_NULL=0,
 179
 180         TOK_OR,
 181         TOK_NOT,
 182         TOK_STARTBRACE,
 183         TOK_ENDBRACE,
 184
 185         TOK_ACCEPT,
 186         TOK_COUNT,
 187         TOK_PIPE,
 188         TOK_QUEUE,
 189         TOK_DIVERT,
 190         TOK_TEE,
 191         TOK_FORWARD,
 192         TOK_SKIPTO,
 193         TOK_DENY,
 194         TOK_REJECT,
 195         TOK_RESET,
 196         TOK_UNREACH,
 197         TOK_CHECKSTATE,
 198
 199         TOK_UID,
 200         TOK_GID,
 201         TOK_IN,
 202         TOK_LIMIT,
 203         TOK_KEEPSTATE,
 204         TOK_LAYER2,
 205         TOK_OUT,
 206         TOK_XMIT,
 207         TOK_RECV,
 208         TOK_VIA,
 209         TOK_FRAG,
 210         TOK_IPOPTS,
 211         TOK_IPLEN,
 212         TOK_IPID,
 213         TOK_IPPRECEDENCE,
 214         TOK_IPTOS,
 215         TOK_IPTTL,
 216         TOK_IPVER,
 217         TOK_ESTAB,
 218         TOK_SETUP,
 219         TOK_TCPFLAGS,
 220         TOK_TCPOPTS,
 221         TOK_TCPSEQ,
 222         TOK_TCPACK,
 223         TOK_TCPWIN,
 224         TOK_ICMPTYPES,
 225         TOK_MAC,
 226         TOK_MACTYPE,
 227
 228         TOK_PLR,
 229         TOK_NOERROR,
 230         TOK_BUCKETS,
 231         TOK_DSTIP,
 232         TOK_SRCIP,
 233         TOK_DSTPORT,
 234         TOK_SRCPORT,
 235         TOK_ALL,
 236         TOK_MASK,
 237         TOK_BW,
 238         TOK_DELAY,
 239         TOK_RED,
 240         TOK_GRED,
 241         TOK_DROPTAIL,
 242         TOK_PROTO,
 243         TOK_WEIGHT,
 244 };
 245
 246 struct _s_x dummynet_params[] = {
 247         { "plr",                TOK_PLR },
 248         { "noerror",            TOK_NOERROR },
 249         { "buckets",            TOK_BUCKETS },
 250         { "dst-ip",             TOK_DSTIP },
 251         { "src-ip",             TOK_SRCIP },
 252         { "dst-port",           TOK_DSTPORT },
 253         { "src-port",           TOK_SRCPORT },
 254         { "proto",              TOK_PROTO },
 255         { "weight",             TOK_WEIGHT },
 256         { "all",                TOK_ALL },
 257         { "mask",               TOK_MASK },
 258         { "droptail",           TOK_DROPTAIL },
 259         { "red",                TOK_RED },
 260         { "gred",               TOK_GRED },
 261         { "bw",                 TOK_BW },
 262         { "bandwidth",          TOK_BW },
 263         { "delay",              TOK_DELAY },
 264         { "pipe",               TOK_PIPE },
 265         { "queue",              TOK_QUEUE },
 266         { "dummynet-params",    TOK_NULL },
 267         { NULL, 0 }
 268 };
 269
 270 struct _s_x rule_actions[] = {
 271         { "accept",             TOK_ACCEPT },
 272         { "pass",               TOK_ACCEPT },
 273         { "allow",              TOK_ACCEPT },
 274         { "permit",             TOK_ACCEPT },
 275         { "count",              TOK_COUNT },
 276         { "pipe",               TOK_PIPE },
 277         { "queue",              TOK_QUEUE },
 278         { "divert",             TOK_DIVERT },
 279         { "tee",                TOK_TEE },
 280         { "fwd",                TOK_FORWARD },
 281         { "forward",            TOK_FORWARD },
 282         { "skipto",             TOK_SKIPTO },
 283         { "deny",               TOK_DENY },
 284         { "drop",               TOK_DENY },
 285         { "reject",             TOK_REJECT },
 286         { "reset",              TOK_RESET },
 287         { "unreach",            TOK_UNREACH },
 288         { "check-state",        TOK_CHECKSTATE },
 289         { NULL,                 TOK_NULL },
 290         { NULL, 0 }
 291 };
 292
 293 struct _s_x rule_options[] = {
 294         { "uid",                TOK_UID },
 295         { "gid",                TOK_GID },
 296         { "in",                 TOK_IN },
 297         { "limit",              TOK_LIMIT },
 298         { "keep-state",         TOK_KEEPSTATE },
 299         { "bridged",            TOK_LAYER2 },
 300         { "layer2",             TOK_LAYER2 },
 301         { "out",                TOK_OUT },
 302         { "xmit",               TOK_XMIT },
 303         { "recv",               TOK_RECV },
 304         { "via",                TOK_VIA },
 305         { "fragment",           TOK_FRAG },
 306         { "frag",               TOK_FRAG },
 307         { "ipoptions",          TOK_IPOPTS },
 308         { "ipopts",             TOK_IPOPTS },
 309         { "iplen",              TOK_IPLEN },
 310         { "ipid",               TOK_IPID },
 311         { "ipprecedence",       TOK_IPPRECEDENCE },
 312         { "iptos",              TOK_IPTOS },
 313         { "ipttl",              TOK_IPTTL },
 314         { "ipversion",          TOK_IPVER },
 315         { "ipver",              TOK_IPVER },
 316         { "estab",              TOK_ESTAB },
 317         { "established",        TOK_ESTAB },
 318         { "setup",              TOK_SETUP },
 319         { "tcpflags",           TOK_TCPFLAGS },
 320         { "tcpflgs",            TOK_TCPFLAGS },
 321         { "tcpoptions",         TOK_TCPOPTS },
 322         { "tcpopts",            TOK_TCPOPTS },
 323         { "tcpseq",             TOK_TCPSEQ },
 324         { "tcpack",             TOK_TCPACK },
 325         { "tcpwin",             TOK_TCPWIN },
 326         { "icmptype",           TOK_ICMPTYPES },
 327         { "icmptypes",          TOK_ICMPTYPES },
 328         { "dst-ip",             TOK_DSTIP },
 329         { "src-ip",             TOK_SRCIP },
 330         { "dst-port",           TOK_DSTPORT },
 331         { "src-port",           TOK_SRCPORT },
 332         { "proto",              TOK_PROTO },
 333         { "MAC",                TOK_MAC },
 334         { "mac",                TOK_MAC },
 335         { "mac-type",           TOK_MACTYPE },
 336
 337         { "not",                TOK_NOT },              /* pseudo option */
 338         { "!", /* escape ? */   TOK_NOT },              /* pseudo option */
 339         { "or",                 TOK_OR },               /* pseudo option */
 340         { "|", /* escape */     TOK_OR },               /* pseudo option */
 341         { "{",                  TOK_STARTBRACE },       /* pseudo option */
 342         { "(",                  TOK_STARTBRACE },       /* pseudo option */
 343         { "}",                  TOK_ENDBRACE },         /* pseudo option */
 344         { ")",                  TOK_ENDBRACE },         /* pseudo option */
 345         { NULL,                 TOK_NULL },
 346         { NULL, 0 }
 347 };
 348
 349 /**
 350  * match_token takes a table and a string, returns the value associated
 351  * with the string (0 meaning an error in most cases)
 352  */
 353 static int
 354 match_token(struct _s_x *table, char *string)
 355 {
 356         struct _s_x *pt;
 357         int i = strlen(string);
 358
 359         for (pt = table ; i && pt->s != NULL ; pt++)
 360                 if (strlen(pt->s) == i && !bcmp(string, pt->s, i))
 361                         return pt->x;
 362         return -1;
 363 };
 364
 365 static char *
 366 match_value(struct _s_x *p, u_int32_t value)
 367 {
 368         for (; p->s != NULL; p++)
 369                 if (p->x == value)
 370                         return p->s;
 371         return NULL;
 372 }
 373
 374 /*
 375  * prints one port, symbolic or numeric
 376  */
 377 static void
 378 print_port(int proto, u_int16_t port)
 379 {
 380
 381         if (proto == IPPROTO_ETHERTYPE) {
 382                 char *s;
 383
 384                 if (do_resolv && (s = match_value(ether_types, port)) )
 385                         printf("%s", s);
 386                 else
 387                         printf("0x%04x", port);
 388         } else {
 389                 struct servent *se = NULL;
 390                 if (do_resolv) {
 391                         struct protoent *pe = getprotobynumber(proto);
 392
 393                         se = getservbyport(htons(port), pe ? pe->p_name : NULL);
 394                 }
 395                 if (se)
 396                         printf("%s", se->s_name);
 397                 else
 398                         printf("%d", port);
 399         }
 400 }
 401
 402 /*
 403  * print the values in a list of ports
 404  * XXX todo: add support for mask.
 405  */
 406 static void
 407 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
 408 {
 409         u_int16_t *p = cmd->ports;
 410         int i;
 411         char *sep= " ";
 412
 413         if (cmd->o.len & F_NOT)
 414                 printf(" not");
 415         if (opcode != 0)
 416                 printf ("%s", opcode == O_MAC_TYPE ? " mac-type" :
 417                     (opcode == O_IP_DSTPORT ? " dst-port" : " src-port"));
 418         for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
 419                 printf(sep);
 420                 print_port(proto, p[0]);
 421                 if (p[0] != p[1]) {
 422                         printf("-");
 423                         print_port(proto, p[1]);
 424                 }
 425                 sep = ",";
 426         }
 427 }
 428
 429 /*
 430  * Like strtol, but also translates service names into port numbers
 431  * for some protocols.
 432  * In particular:
 433  *      proto == -1 disables the protocol check;
 434  *      proto == IPPROTO_ETHERTYPE looks up an internal table
 435  *      proto == <some value in /etc/protocols> matches the values there.
 436  * Returns *end == s in case the parameter is not found.
 437  */
 438 static int
 439 strtoport(char *s, char **end, int base, int proto)
 440 {
 441         char *p, *buf;
 442         char *s1;
 443         int i;
 444
 445         *end = s;               /* default - not found */
 446         if ( *s == '\0')
 447                 return 0;       /* not found */
 448
 449         if (isdigit(*s))
 450                 return strtol(s, end, base);
 451
 452         /*
 453          * find separator. '\\' escapes the next char.
 454          */
 455         for (s1 = s; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
 456                 if (*s1 == '\\' && s1[1] != '\0')
 457                         s1++;
 458
 459         buf = malloc(s1 - s + 1);
 460         if (buf == NULL)
 461                 return 0;
 462
 463         /*
 464          * copy into a buffer skipping backslashes
 465          */
 466         for (p = s, i = 0; p != s1 ; p++)
 467                 if ( *p != '\\')
 468                         buf[i++] = *p;
 469         buf[i++] = '\0';
 470
 471         if (proto == IPPROTO_ETHERTYPE) {
 472                 i = match_token(ether_types, buf);
 473                 free(buf);
 474                 if (i != -1) {  /* found */
 475                         *end = s1;
 476                         return i;
 477                 }
 478         } else {
 479                 struct protoent *pe = NULL;
 480                 struct servent *se;
 481
 482                 if (proto != 0)
 483                         pe = getprotobynumber(proto);
 484                 setservent(1);
 485                 se = getservbyname(buf, pe ? pe->p_name : NULL);
 486                 free(buf);
 487                 if (se != NULL) {
 488                         *end = s1;
 489                         return ntohs(se->s_port);
 490                 }
 491         }
 492         return 0;       /* not found */
 493 }
 494
 495 /*
 496  * fill the body of the command with the list of port ranges.
 497  * At the moment it only understands numeric ranges.
 498  */
 499 static int
 500 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
 501 {
 502         u_int16_t *p = cmd->ports;
 503         int i = 0;
 504         char *s = av;
 505
 506         while (*s) {
 507                 u_int16_t a, b;
 508
 509                 a = strtoport(av, &s, 0, proto);
 510                 if (s == av) /* no parameter */
 511                         break;
 512                 if (*s == '-') { /* a range */
 513                         av = s+1;
 514                         b = strtoport(av, &s, 0, proto);
 515                         if (s == av) /* no parameter */
 516                                 break;
 517                         p[0] = a;
 518                         p[1] = b;
 519                 } else if (*s == ',' || *s == '\0' ) {
 520                         p[0] = p[1] = a;
 521                 } else {        /* invalid separator */
 522                         errx(EX_DATAERR, "invalid separator <%c> in <%s>\n",
 523                                 *s, av);
 524                 }
 525                 i++;
 526                 p += 2;
 527                 av = s+1;
 528         }
 529         if (i > 0) {
 530                 if (i+1 > F_LEN_MASK)
 531                         errx(EX_DATAERR, "too many ports/ranges\n");
 532                 cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
 533         }
 534         return i;
 535 }
 536
 537 static struct _s_x icmpcodes[] = {
 538       { "net",                  ICMP_UNREACH_NET },
 539       { "host",                 ICMP_UNREACH_HOST },
 540       { "protocol",             ICMP_UNREACH_PROTOCOL },
 541       { "port",                 ICMP_UNREACH_PORT },
 542       { "needfrag",             ICMP_UNREACH_NEEDFRAG },
 543       { "srcfail",              ICMP_UNREACH_SRCFAIL },
 544       { "net-unknown",          ICMP_UNREACH_NET_UNKNOWN },
 545       { "host-unknown",         ICMP_UNREACH_HOST_UNKNOWN },
 546       { "isolated",             ICMP_UNREACH_ISOLATED },
 547       { "net-prohib",           ICMP_UNREACH_NET_PROHIB },
 548       { "host-prohib",          ICMP_UNREACH_HOST_PROHIB },
 549       { "tosnet",               ICMP_UNREACH_TOSNET },
 550       { "toshost",              ICMP_UNREACH_TOSHOST },
 551       { "filter-prohib",        ICMP_UNREACH_FILTER_PROHIB },
 552       { "host-precedence",      ICMP_UNREACH_HOST_PRECEDENCE },
 553       { "precedence-cutoff",    ICMP_UNREACH_PRECEDENCE_CUTOFF },
 554       { NULL, 0 }
 555 };
 556
 557 static void
 558 fill_reject_code(u_short *codep, char *str)
 559 {
 560         int val;
 561         char *s;
 562
 563         val = strtoul(str, &s, 0);
 564         if (s == str || *s != '\0' || val >= 0x100)
 565                 val = match_token(icmpcodes, str);
 566         if (val < 0)
 567                 errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
 568         *codep = val;
 569         return;
 570 }
 571
 572 static void
 573 print_reject_code(u_int16_t code)
 574 {
 575         char *s = match_value(icmpcodes, code);
 576
 577         if (s != NULL)
 578                 printf("unreach %s", s);
 579         else
 580                 printf("unreach %u", code);
 581 }
 582
 583 /*
 584  * Returns the number of bits set (from left) in a contiguous bitmask,
 585  * or -1 if the mask is not contiguous.
 586  * XXX this needs a proper fix.
 587  * This effectively works on masks in big-endian (network) format.
 588  * when compiled on little endian architectures.
 589  *
 590  * First bit is bit 7 of the first byte -- note, for MAC addresses,
 591  * the first bit on the wire is bit 0 of the first byte.
 592  * len is the max length in bits.
 593  */
 594 static int
 595 contigmask(u_char *p, int len)
 596 {
 597         int i, n;
 598         for (i=0; i<len ; i++)
 599                 if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
 600                         break;
 601         for (n=i+1; n < len; n++)
 602                 if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
 603                         return -1; /* mask not contiguous */
 604         return i;
 605 }
 606
 607 /*
 608  * print flags set/clear in the two bitmasks passed as parameters.
 609  * There is a specialized check for f_tcpflags.
 610  */
 611 static void
 612 print_flags(char *name, ipfw_insn *cmd, struct _s_x *list)
 613 {
 614         char *comma="";
 615         int i;
 616         u_char set = cmd->arg1 & 0xff;
 617         u_char clear = (cmd->arg1 >> 8) & 0xff;
 618
 619         if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
 620                 printf(" setup");
 621                 return;
 622         }
 623
 624         printf(" %s ", name);
 625         for (i=0; list[i].x != 0; i++) {
 626                 if (set & list[i].x) {
 627                         set &= ~list[i].x;
 628                         printf("%s%s", comma, list[i].s);
 629                         comma = ",";
 630                 }
 631                 if (clear & list[i].x) {
 632                         clear &= ~list[i].x;
 633                         printf("%s!%s", comma, list[i].s);
 634                         comma = ",";
 635                 }
 636         }
 637 }
 638
 639 /*
 640  * Print the ip address contained in a command.
 641  */
 642 static void
 643 print_ip(ipfw_insn_ip *cmd, char *s)
 644 {
 645         struct hostent *he = NULL;
 646         int mb;
 647
 648         printf("%s%s ", cmd->o.len & F_NOT ? " not": "", s);
 649
 650         if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
 651                 printf("me");
 652                 return;
 653         }
 654         if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
 655                 u_int32_t x, *d;
 656                 int i;
 657                 char comma = '{';
 658
 659                 x = cmd->o.arg1 - 1;
 660                 x = htonl( ~x );
 661                 cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 662                 printf("%s/%d", inet_ntoa(cmd->addr),
 663                         contigmask((u_char *)&x, 32));
 664                 x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
 665                 x &= 0xff; /* base */
 666                 d = (u_int32_t *)&(cmd->mask);
 667                 for (i=0; i < cmd->o.arg1; i++)
 668                         if (d[ i/32] & (1<<(i & 31))) {
 669                                 printf("%c%d", comma, i+x);
 670                                 comma = ',';
 671                         }
 672                 printf("}");
 673                 return;
 674         }
 675         if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST)
 676                 mb = 32;
 677         else
 678                 mb = contigmask((u_char *)&(cmd->mask.s_addr), 32);
 679         if (mb == 32 && do_resolv)
 680                 he = gethostbyaddr((char *)&(cmd->addr.s_addr),
 681                     sizeof(u_long), AF_INET);
 682         if (he != NULL)         /* resolved to name */
 683                 printf("%s", he->h_name);
 684         else if (mb == 0)       /* any */
 685                 printf("any");
 686         else {          /* numeric IP followed by some kind of mask */
 687                 printf("%s", inet_ntoa(cmd->addr));
 688                 if (mb < 0)
 689                         printf(":%s", inet_ntoa(cmd->mask));
 690                 else if (mb < 32)
 691                         printf("/%d", mb);
 692         }
 693 }
 694
 695 /*
 696  * prints a MAC address/mask pair
 697  */
 698 static void
 699 print_mac(u_char *addr, u_char *mask)
 700 {
 701         int l = contigmask(mask, 48);
 702
 703         if (l == 0)
 704                 printf(" any");
 705         else {
 706                 printf(" %02x:%02x:%02x:%02x:%02x:%02x",
 707                     addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
 708                 if (l == -1)
 709                         printf("&%02x:%02x:%02x:%02x:%02x:%02x",
 710                             mask[0], mask[1], mask[2],
 711                             mask[3], mask[4], mask[5]);
 712                 else if (l < 48)
 713                         printf("/%d", l);
 714         }
 715 }
 716
 717 static void
 718 fill_icmptypes(ipfw_insn_u32 *cmd, char *av)
 719 {
 720         u_int8_t type;
 721
 722         cmd->d[0] = 0;
 723         while (*av) {
 724                 if (*av == ',')
 725                         av++;
 726
 727                 type = strtoul(av, &av, 0);
 728
 729                 if (*av != ',' && *av != '\0')
 730                         errx(EX_DATAERR, "invalid ICMP type");
 731
 732                 if (type > 31)
 733                         errx(EX_DATAERR, "ICMP type out of range");
 734
 735                 cmd->d[0] |= 1 << type;
 736         }
 737         cmd->o.opcode = O_ICMPTYPE;
 738         cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
 739 }
 740
 741 static void
 742 print_icmptypes(ipfw_insn_u32 *cmd)
 743 {
 744         int i;
 745         char sep= ' ';
 746
 747         printf(" icmptypes");
 748         for (i = 0; i < 32; i++) {
 749                 if ( (cmd->d[0] & (1 << (i))) == 0)
 750                         continue;
 751                 printf("%c%d", sep, i);
 752                 sep = ',';
 753         }
 754 }
 755
 756 /*
 757  * show_ipfw() prints the body of an ipfw rule.
 758  * Because the standard rule has at least proto src_ip dst_ip, we use
 759  * a helper function to produce these entries if not provided explicitly.
 760  * The first argument is the list of fields we have, the second is
 761  * the list of fields we want to be printed.
 762  *
 763  * Special cases if we have provided a MAC header:
 764  *   + if the rule does not contain IP addresses/ports, do not print them;
 765  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
 766  *
 767  * Once we have 'have_options', IP header fields are printed as options.
 768  */
 769 #define HAVE_PROTO      0x0001
 770 #define HAVE_SRCIP      0x0002
 771 #define HAVE_DSTIP      0x0004
 772 #define HAVE_MAC        0x0008
 773 #define HAVE_MACTYPE    0x0010
 774 #define HAVE_OPTIONS    0x8000
 775
 776 #define HAVE_IP         (HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
 777 static void
 778 show_prerequisites(int *flags, int want, int cmd)
 779 {
 780         if ( (*flags & HAVE_IP) == HAVE_IP)
 781                 *flags |= HAVE_OPTIONS;
 782
 783         if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC &&
 784              cmd != O_MAC_TYPE) {
 785                 /*
 786                  * mac-type was optimized out by the compiler,
 787                  * restore it
 788                  */
 789                 printf(" any");
 790                 *flags |= HAVE_MACTYPE | HAVE_OPTIONS;
 791                 return;
 792         }
 793         if ( !(*flags & HAVE_OPTIONS)) {
 794                 if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
 795                         printf(" ip");
 796                 if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
 797                         printf(" from any");
 798                 if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
 799                         printf(" to any");
 800         }
 801         *flags |= want;
 802 }
 803
 804 static void
 805 show_ipfw(struct ip_fw *rule, int pcwidth, int bcwidth)
 806 {
 807         static int twidth = 0;
 808         int l;
 809         ipfw_insn *cmd;
 810         int proto = 0;          /* default */
 811         int flags = 0;  /* prerequisites */
 812         ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
 813         int or_block = 0;       /* we are in an or block */
 814
 815         u_int32_t set_disable = (u_int32_t)(rule->next_rule);
 816
 817         if (set_disable & (1 << rule->set)) { /* disabled */
 818                 if (!show_sets)
 819                         return;
 820                 else
 821                         printf("# DISABLED ");
 822         }
 823         printf("%05u ", rule->rulenum);
 824
 825         if (do_acct)
 826                 printf("%*llu %*llu ", pcwidth, rule->pcnt, bcwidth,
 827                     rule->bcnt);
 828
 829         if (do_time) {
 830                 char timestr[30];
 831
 832                 if (twidth == 0) {
 833                         strcpy(timestr, ctime((time_t *)&twidth));
 834                         *strchr(timestr, '\n') = '\0';
 835                         twidth = strlen(timestr);
 836                 }
 837                 if (rule->timestamp) {
 838 #if _FreeBSD_version < 500000 /* XXX check */
 839 #define _long_to_time(x)        (time_t)(x)
 840 #endif
 841                         time_t t = _long_to_time(rule->timestamp);
 842
 843                         strcpy(timestr, ctime(&t));
 844                         *strchr(timestr, '\n') = '\0';
 845                         printf("%s ", timestr);
 846                 } else {
 847                         printf("%*s ", twidth, " ");
 848                 }
 849         }
 850
 851         if (show_sets)
 852                 printf("set %d ", rule->set);
 853
 854         /*
 855          * print the optional "match probability"
 856          */
 857         if (rule->cmd_len > 0) {
 858                 cmd = rule->cmd ;
 859                 if (cmd->opcode == O_PROB) {
 860                         ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
 861                         double d = 1.0 * p->d[0];
 862
 863                         d = (d / 0x7fffffff);
 864                         printf("prob %f ", d);
 865                 }
 866         }
 867
 868         /*
 869          * first print actions
 870          */
 871         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
 872                         l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
 873                 switch(cmd->opcode) {
 874                 case O_CHECK_STATE:
 875                         printf("check-state");
 876                         flags = HAVE_IP; /* avoid printing anything else */
 877                         break;
 878
 879                 case O_ACCEPT:
 880                         printf("allow");
 881                         break;
 882
 883                 case O_COUNT:
 884                         printf("count");
 885                         break;
 886
 887                 case O_DENY:
 888                         printf("deny");
 889                         break;
 890
 891                 case O_REJECT:
 892                         if (cmd->arg1 == ICMP_REJECT_RST)
 893                                 printf("reset");
 894                         else if (cmd->arg1 == ICMP_UNREACH_HOST)
 895                                 printf("reject");
 896                         else
 897                                 print_reject_code(cmd->arg1);
 898                         break;
 899
 900                 case O_SKIPTO:
 901                         printf("skipto %u", cmd->arg1);
 902                         break;
 903
 904                 case O_PIPE:
 905                         printf("pipe %u", cmd->arg1);
 906                         break;
 907
 908                 case O_QUEUE:
 909                         printf("queue %u", cmd->arg1);
 910                         break;
 911
 912                 case O_DIVERT:
 913                         printf("divert %u", cmd->arg1);
 914                         break;
 915
 916                 case O_TEE:
 917                         printf("tee %u", cmd->arg1);
 918                         break;
 919
 920                 case O_FORWARD_IP:
 921                     {
 922                         ipfw_insn_sa *s = (ipfw_insn_sa *)cmd;
 923
 924                         printf("fwd %s", inet_ntoa(s->sa.sin_addr));
 925                         if (s->sa.sin_port)
 926                                 printf(",%d", s->sa.sin_port);
 927                     }
 928                         break;
 929
 930                 case O_LOG: /* O_LOG is printed last */
 931                         logptr = (ipfw_insn_log *)cmd;
 932                         break;
 933
 934                 default:
 935                         printf("** unrecognized action %d len %d",
 936                                 cmd->opcode, cmd->len);
 937                 }
 938         }
 939         if (logptr) {
 940                 if (logptr->max_log > 0)
 941                         printf(" log logamount %d", logptr->max_log);
 942                 else
 943                         printf(" log");
 944         }
 945
 946         /*
 947          * then print the body.
 948          */
 949         if (rule->_pad & 1) {   /* empty rules before options */
 950                 if (!do_compact)
 951                         printf(" ip from any to any");
 952                 flags |= HAVE_IP | HAVE_OPTIONS;
 953         }
 954
 955         for (l = rule->act_ofs, cmd = rule->cmd ;
 956                         l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
 957                 /* useful alias */
 958                 ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
 959
 960                 show_prerequisites(&flags, 0, cmd->opcode);
 961
 962                 switch(cmd->opcode) {
 963                 case O_PROB:
 964                         break;  /* done already */
 965
 966                 case O_PROBE_STATE:
 967                         break; /* no need to print anything here */
 968
 969                 case O_MACADDR2: {
 970                         ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
 971
 972                         if ((cmd->len & F_OR) && !or_block)
 973                                 printf(" {");
 974                         if (cmd->len & F_NOT)
 975                                 printf(" not");
 976                         printf(" MAC");
 977                         flags |= HAVE_MAC;
 978                         print_mac( m->addr, m->mask);
 979                         print_mac( m->addr + 6, m->mask + 6);
 980                         }
 981                         break;
 982
 983                 case O_MAC_TYPE:
 984                         if ((cmd->len & F_OR) && !or_block)
 985                                 printf(" {");
 986                         print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE,
 987                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
 988                         flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS;
 989                         break;
 990
 991                 case O_IP_SRC:
 992                 case O_IP_SRC_MASK:
 993                 case O_IP_SRC_ME:
 994                 case O_IP_SRC_SET:
 995                         show_prerequisites(&flags, HAVE_PROTO, 0);
 996                         if (!(flags & HAVE_SRCIP))
 997                                 printf(" from");
 998                         if ((cmd->len & F_OR) && !or_block)
 999                                 printf(" {");
1000                         print_ip((ipfw_insn_ip *)cmd,
1001                                 (flags & HAVE_OPTIONS) ? " src-ip" : "");
1002                         flags |= HAVE_SRCIP;
1003                         break;
1004
1005                 case O_IP_DST:
1006                 case O_IP_DST_MASK:
1007                 case O_IP_DST_ME:
1008                 case O_IP_DST_SET:
1009                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1010                         if (!(flags & HAVE_DSTIP))
1011                                 printf(" to");
1012                         if ((cmd->len & F_OR) && !or_block)
1013                                 printf(" {");
1014                         print_ip((ipfw_insn_ip *)cmd,
1015                                 (flags & HAVE_OPTIONS) ? " dst-ip" : "");
1016                         flags |= HAVE_DSTIP;
1017                         break;
1018
1019                 case O_IP_DSTPORT:
1020                         show_prerequisites(&flags, HAVE_IP, 0);
1021                 case O_IP_SRCPORT:
1022                         show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1023                         if ((cmd->len & F_OR) && !or_block)
1024                                 printf(" {");
1025                         print_newports((ipfw_insn_u16 *)cmd, proto,
1026                                 (flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1027                         break;
1028
1029                 case O_PROTO: {
1030                         struct protoent *pe;
1031
1032                         if ((cmd->len & F_OR) && !or_block)
1033                                 printf(" {");
1034                         if (cmd->len & F_NOT)
1035                                 printf(" not");
1036                         proto = cmd->arg1;
1037                         pe = getprotobynumber(cmd->arg1);
1038                         if (flags & HAVE_OPTIONS)
1039                                 printf(" proto");
1040                         if (pe)
1041                                 printf(" %s", pe->p_name);
1042                         else
1043                                 printf(" %u", cmd->arg1);
1044                         }
1045                         flags |= HAVE_PROTO;
1046                         break;
1047
1048                 default: /*options ... */
1049                         show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
1050                         if ((cmd->len & F_OR) && !or_block)
1051                                 printf(" {");
1052                         if (cmd->len & F_NOT && cmd->opcode != O_IN)
1053                                 printf(" not");
1054                         switch(cmd->opcode) {
1055                         case O_FRAG:
1056                                 printf(" frag");
1057                                 break;
1058
1059                         case O_IN:
1060                                 printf(cmd->len & F_NOT ? " out" : " in");
1061                                 break;
1062
1063                         case O_LAYER2:
1064                                 printf(" layer2");
1065                                 break;
1066                         case O_XMIT:
1067                         case O_RECV:
1068                         case O_VIA: {
1069                                 char *s;
1070                                 ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1071
1072                                 if (cmd->opcode == O_XMIT)
1073                                         s = "xmit";
1074                                 else if (cmd->opcode == O_RECV)
1075                                         s = "recv";
1076                                 else if (cmd->opcode == O_VIA)
1077                                         s = "via";
1078                                 else
1079                                         s = "?huh?";
1080                                 if (cmdif->name[0] == '\0')
1081                                         printf(" %s %s", s,
1082                                             inet_ntoa(cmdif->p.ip));
1083                                 printf(" %s %s", s, cmdif->name);
1084                                 }
1085                                 break;
1086
1087                         case O_IPID:
1088                                 printf(" ipid %u", cmd->arg1 );
1089                                 break;
1090
1091                         case O_IPTTL:
1092                                 printf(" ipttl %u", cmd->arg1 );
1093                                 break;
1094
1095                         case O_IPVER:
1096                                 printf(" ipver %u", cmd->arg1 );
1097                                 break;
1098
1099                         case O_IPPRECEDENCE:
1100                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1101                                 break;
1102
1103                         case O_IPLEN:
1104                                 printf(" iplen %u", cmd->arg1 );
1105                                 break;
1106
1107                         case O_IPOPT:
1108                                 print_flags("ipoptions", cmd, f_ipopts);
1109                                 break;
1110
1111                         case O_IPTOS:
1112                                 print_flags("iptos", cmd, f_iptos);
1113                                 break;
1114
1115                         case O_ICMPTYPE:
1116                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1117                                 break;
1118
1119                         case O_ESTAB:
1120                                 printf(" established");
1121                                 break;
1122
1123                         case O_TCPFLAGS:
1124                                 print_flags("tcpflags", cmd, f_tcpflags);
1125                                 break;
1126
1127                         case O_TCPOPTS:
1128                                 print_flags("tcpoptions", cmd, f_tcpopts);
1129                                 break;
1130
1131                         case O_TCPWIN:
1132                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1133                                 break;
1134
1135                         case O_TCPACK:
1136                                 printf(" tcpack %ld", ntohl(cmd32->d[0]));
1137                                 break;
1138
1139                         case O_TCPSEQ:
1140                                 printf(" tcpseq %ld", ntohl(cmd32->d[0]));
1141                                 break;
1142
1143                         case O_UID:
1144                             {
1145                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1146
1147                                 if (pwd)
1148                                         printf(" uid %s", pwd->pw_name);
1149                                 else
1150                                         printf(" uid %u", cmd32->d[0]);
1151                             }
1152                                 break;
1153
1154                         case O_GID:
1155                             {
1156                                 struct group *grp = getgrgid(cmd32->d[0]);
1157
1158                                 if (grp)
1159                                         printf(" gid %s", grp->gr_name);
1160                                 else
1161                                         printf(" gid %u", cmd32->d[0]);
1162                             }
1163                                 break;
1164
1165                         case O_KEEP_STATE:
1166                                 printf(" keep-state");
1167                                 break;
1168
1169                         case O_LIMIT:
1170                             {
1171                                 struct _s_x *p = limit_masks;
1172                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1173                                 u_int8_t x = c->limit_mask;
1174                                 char *comma = " ";
1175
1176                                 printf(" limit");
1177                                 for ( ; p->x != 0 ; p++)
1178                                         if ((x & p->x) == p->x) {
1179                                                 x &= ~p->x;
1180                                                 printf("%s%s", comma, p->s);
1181                                                 comma = ",";
1182                                         }
1183                                 printf(" %d", c->conn_limit);
1184                             }
1185                                 break;
1186
1187                         default:
1188                                 printf(" [opcode %d len %d]",
1189                                     cmd->opcode, cmd->len);
1190                         }
1191                 }
1192                 if (cmd->len & F_OR) {
1193                         printf(" or");
1194                         or_block = 1;
1195                 } else if (or_block) {
1196                         printf(" }");
1197                         or_block = 0;
1198                 }
1199         }
1200         show_prerequisites(&flags, HAVE_IP, 0);
1201
1202         printf("\n");
1203 }
1204
1205 static void
1206 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1207 {
1208         struct protoent *pe;
1209         struct in_addr a;
1210
1211         if (!do_expired) {
1212                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1213                         return;
1214         }
1215
1216         printf("%05d %*llu %*llu (%ds)", (int)(d->rule), pcwidth, d->pcnt,
1217             bcwidth, d->bcnt, d->expire);
1218         switch (d->dyn_type) {
1219         case O_LIMIT_PARENT:
1220                 printf(" PARENT %d", d->count);
1221                 break;
1222         case O_LIMIT:
1223                 printf(" LIMIT");
1224                 break;
1225         case O_KEEP_STATE: /* bidir, no mask */
1226                 printf(" STATE");
1227                 break;
1228         }
1229
1230         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1231                 printf(" %s", pe->p_name);
1232         else
1233                 printf(" proto %u", d->id.proto);
1234
1235         a.s_addr = htonl(d->id.src_ip);
1236         printf(" %s %d", inet_ntoa(a), d->id.src_port);
1237
1238         a.s_addr = htonl(d->id.dst_ip);
1239         printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1240         printf("\n");
1241 }
1242
1243 int
1244 sort_q(const void *pa, const void *pb)
1245 {
1246         int rev = (do_sort < 0);
1247         int field = rev ? -do_sort : do_sort;
1248         long long res = 0;
1249         const struct dn_flow_queue *a = pa;
1250         const struct dn_flow_queue *b = pb;
1251
1252         switch (field) {
1253         case 1: /* pkts */
1254                 res = a->len - b->len;
1255                 break;
1256         case 2: /* bytes */
1257                 res = a->len_bytes - b->len_bytes;
1258                 break;
1259
1260         case 3: /* tot pkts */
1261                 res = a->tot_pkts - b->tot_pkts;
1262                 break;
1263
1264         case 4: /* tot bytes */
1265                 res = a->tot_bytes - b->tot_bytes;
1266                 break;
1267         }
1268         if (res < 0)
1269                 res = -1;
1270         if (res > 0)
1271                 res = 1;
1272         return (int)(rev ? res : -res);
1273 }
1274
1275 static void
1276 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
1277 {
1278         int l;
1279
1280         printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1281             fs->flow_mask.proto,
1282             fs->flow_mask.src_ip, fs->flow_mask.src_port,
1283             fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
1284         if (fs->rq_elements == 0)
1285                 return;
1286
1287         printf("BKT Prot ___Source IP/port____ "
1288             "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1289         if (do_sort != 0)
1290                 heapsort(q, fs->rq_elements, sizeof *q, sort_q);
1291         for (l = 0; l < fs->rq_elements; l++) {
1292                 struct in_addr ina;
1293                 struct protoent *pe;
1294
1295                 ina.s_addr = htonl(q[l].id.src_ip);
1296                 printf("%3d ", q[l].hash_slot);
1297                 pe = getprotobynumber(q[l].id.proto);
1298                 if (pe)
1299                         printf("%-4s ", pe->p_name);
1300                 else
1301                         printf("%4u ", q[l].id.proto);
1302                 printf("%15s/%-5d ",
1303                     inet_ntoa(ina), q[l].id.src_port);
1304                 ina.s_addr = htonl(q[l].id.dst_ip);
1305                 printf("%15s/%-5d ",
1306                     inet_ntoa(ina), q[l].id.dst_port);
1307                 printf("%4qu %8qu %2u %4u %3u\n",
1308                     q[l].tot_pkts, q[l].tot_bytes,
1309                     q[l].len, q[l].len_bytes, q[l].drops);
1310                 if (verbose)
1311                         printf("   S %20qd  F %20qd\n",
1312                             q[l].S, q[l].F);
1313         }
1314 }
1315
1316 static void
1317 print_flowset_parms(struct dn_flow_set *fs, char *prefix)
1318 {
1319         int l;
1320         char qs[30];
1321         char plr[30];
1322         char red[90];   /* Display RED parameters */
1323
1324         l = fs->qsize;
1325         if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1326                 if (l >= 8192)
1327                         sprintf(qs, "%d KB", l / 1024);
1328                 else
1329                         sprintf(qs, "%d B", l);
1330         } else
1331                 sprintf(qs, "%3d sl.", l);
1332         if (fs->plr)
1333                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1334         else
1335                 plr[0] = '\0';
1336         if (fs->flags_fs & DN_IS_RED)   /* RED parameters */
1337                 sprintf(red,
1338                     "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1339                     (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1340                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
1341                     SCALE_VAL(fs->min_th),
1342                     SCALE_VAL(fs->max_th),
1343                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
1344         else
1345                 sprintf(red, "droptail");
1346
1347         printf("%s %s%s %d queues (%d buckets) %s\n",
1348             prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1349 }
1350
1351 static void
1352 list_pipes(void *data, int nbytes, int ac, char *av[])
1353 {
1354         u_long rulenum;
1355         void *next = data;
1356         struct dn_pipe *p = (struct dn_pipe *) data;
1357         struct dn_flow_set *fs;
1358         struct dn_flow_queue *q;
1359         int l;
1360
1361         if (ac > 0)
1362                 rulenum = strtoul(*av++, NULL, 10);
1363         else
1364                 rulenum = 0;
1365         for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
1366                 double b = p->bandwidth;
1367                 char buf[30];
1368                 char prefix[80];
1369
1370                 if (p->next != (struct dn_pipe *)DN_IS_PIPE)
1371                         break;  /* done with pipes, now queues */
1372
1373                 /*
1374                  * compute length, as pipe have variable size
1375                  */
1376                 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1377                 next = (void *)p + l;
1378                 nbytes -= l;
1379
1380                 if (rulenum != 0 && rulenum != p->pipe_nr)
1381                         continue;
1382
1383                 /*
1384                  * Print rate (or clocking interface)
1385                  */
1386                 if (p->if_name[0] != '\0')
1387                         sprintf(buf, "%s", p->if_name);
1388                 else if (b == 0)
1389                         sprintf(buf, "unlimited");
1390                 else if (b >= 1000000)
1391                         sprintf(buf, "%7.3f Mbit/s", b/1000000);
1392                 else if (b >= 1000)
1393                         sprintf(buf, "%7.3f Kbit/s", b/1000);
1394                 else
1395                         sprintf(buf, "%7.3f bit/s ", b);
1396
1397                 sprintf(prefix, "%05d: %s %4d ms ",
1398                     p->pipe_nr, buf, p->delay);
1399                 print_flowset_parms(&(p->fs), prefix);
1400                 if (verbose)
1401                         printf("   V %20qd\n", p->V >> MY_M);
1402
1403                 q = (struct dn_flow_queue *)(p+1);
1404                 list_queues(&(p->fs), q);
1405         }
1406         for (fs = next; nbytes >= sizeof *fs; fs = next) {
1407                 char prefix[80];
1408
1409                 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE)
1410                         break;
1411                 l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1412                 next = (void *)fs + l;
1413                 nbytes -= l;
1414                 q = (struct dn_flow_queue *)(fs+1);
1415                 sprintf(prefix, "q%05d: weight %d pipe %d ",
1416                     fs->fs_nr, fs->weight, fs->parent_nr);
1417                 print_flowset_parms(fs, prefix);
1418                 list_queues(fs, q);
1419         }
1420 }
1421
1422 /*
1423  * This one handles all set-related commands
1424  *      ipfw set { show | enable | disable }
1425  *      ipfw set swap X Y
1426  *      ipfw set move X to Y
1427  *      ipfw set move rule X to Y
1428  */
1429 static void
1430 sets_handler(int ac, char *av[])
1431 {
1432         u_int32_t set_disable, masks[2];
1433         int i, nbytes;
1434         u_int16_t rulenum;
1435         u_int8_t cmd, new_set;
1436
1437         ac--;
1438         av++;
1439
1440         if (!ac)
1441                 errx(EX_USAGE, "set needs command");
1442         if (!strncmp(*av, "show", strlen(*av)) ) {
1443                 void *data;
1444                 char *msg;
1445
1446                 nbytes = sizeof(struct ip_fw);
1447                 if ((data = malloc(nbytes)) == NULL)
1448                         err(EX_OSERR, "malloc");
1449                 if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0)
1450                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1451                 set_disable = (u_int32_t)(((struct ip_fw *)data)->next_rule);
1452
1453                 for (i = 0, msg = "disable" ; i < 31; i++)
1454                         if (  (set_disable & (1<<i))) {
1455                                 printf("%s %d", msg, i);
1456                                 msg = "";
1457                         }
1458                 msg = (set_disable) ? " enable" : "enable";
1459                 for (i = 0; i < 31; i++)
1460                         if ( !(set_disable & (1<<i))) {
1461                                 printf("%s %d", msg, i);
1462                                 msg = "";
1463                         }
1464                 printf("\n");
1465         } else if (!strncmp(*av, "swap", strlen(*av))) {
1466                 ac--; av++;
1467                 if (ac != 2)
1468                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1469                 rulenum = atoi(av[0]);
1470                 new_set = atoi(av[1]);
1471                 if (!isdigit(*(av[0])) || rulenum > 30)
1472                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1473                 if (!isdigit(*(av[1])) || new_set > 30)
1474                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1475                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1476                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1477                         masks, sizeof(u_int32_t));
1478         } else if (!strncmp(*av, "move", strlen(*av))) {
1479                 ac--; av++;
1480                 if (ac && !strncmp(*av, "rule", strlen(*av))) {
1481                         cmd = 2;
1482                         ac--; av++;
1483                 } else
1484                         cmd = 3;
1485                 if (ac != 3 || strncmp(av[1], "to", strlen(*av)))
1486                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1487                 rulenum = atoi(av[0]);
1488                 new_set = atoi(av[2]);
1489                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) ||
1490                         (cmd == 2 && rulenum == 65535) )
1491                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1492                 if (!isdigit(*(av[2])) || new_set > 30)
1493                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1494                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1495                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1496                         masks, sizeof(u_int32_t));
1497         } else if (!strncmp(*av, "disable", strlen(*av)) ||
1498                    !strncmp(*av, "enable",  strlen(*av)) ) {
1499                 int which = !strncmp(*av, "enable",  strlen(*av)) ? 1 : 0;
1500
1501                 ac--; av++;
1502                 masks[0] = masks[1] = 0;
1503
1504                 while (ac) {
1505                         if (isdigit(**av)) {
1506                                 i = atoi(*av);
1507                                 if (i < 0 || i > 30)
1508                                         errx(EX_DATAERR,
1509                                             "invalid set number %d\n", i);
1510                                 masks[which] |= (1<<i);
1511                         } else if (!strncmp(*av, "disable", strlen(*av)))
1512                                 which = 0;
1513                         else if (!strncmp(*av, "enable", strlen(*av)))
1514                                 which = 1;
1515                         else
1516                                 errx(EX_DATAERR,
1517                                         "invalid set command %s\n", *av);
1518                         av++; ac--;
1519                 }
1520                 if ( (masks[0] & masks[1]) != 0 )
1521                         errx(EX_DATAERR,
1522                             "cannot enable and disable the same set\n");
1523
1524                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks));
1525                 if (i)
1526                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1527         } else
1528                 errx(EX_USAGE, "invalid set command %s\n", *av);
1529 }
1530
1531 static void
1532 sysctl_handler(int ac, char *av[], int which)
1533 {
1534         ac--;
1535         av++;
1536
1537         if (*av == NULL) {
1538                 warnx("missing keyword to enable/disable\n");
1539         } else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
1540                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1541                     &which, sizeof(which));
1542         } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) {
1543                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1544                     &which, sizeof(which));
1545         } else if (strncmp(*av, "debug", strlen(*av)) == 0) {
1546                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1547                     &which, sizeof(which));
1548         } else if (strncmp(*av, "verbose", strlen(*av)) == 0) {
1549                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1550                     &which, sizeof(which));
1551         } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) {
1552                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1553                     &which, sizeof(which));
1554         } else {
1555                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1556         }
1557 }
1558
1559 static void
1560 list(int ac, char *av[])
1561 {
1562         struct ip_fw *r;
1563         ipfw_dyn_rule *dynrules, *d;
1564
1565         void *lim, *data = NULL;
1566         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1567         int exitval = EX_OK;
1568         int lac;
1569         char **lav;
1570         u_long rnum;
1571         char *endptr;
1572         int seen = 0;
1573
1574         const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1575         int nalloc = 1024;      /* start somewhere... */
1576
1577         ac--;
1578         av++;
1579
1580         /* get rules or pipes from kernel, resizing array as necessary */
1581         nbytes = nalloc;
1582
1583         while (nbytes >= nalloc) {
1584                 nalloc = nalloc * 2 + 200;
1585                 nbytes = nalloc;
1586                 if ((data = realloc(data, nbytes)) == NULL)
1587                         err(EX_OSERR, "realloc");
1588                 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1589                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1590                                 do_pipe ? "DUMMYNET" : "FW");
1591         }
1592
1593         if (do_pipe) {
1594                 list_pipes(data, nbytes, ac, av);
1595                 goto done;
1596         }
1597
1598         /*
1599          * Count static rules. They have variable size so we
1600          * need to scan the list to count them.
1601          */
1602         for (nstat = 1, r = data, lim = data + nbytes;
1603                     r->rulenum < 65535 && (void *)r < lim;
1604                     ++nstat, r = (void *)r + RULESIZE(r) )
1605                 ; /* nothing */
1606
1607         /*
1608          * Count dynamic rules. This is easier as they have
1609          * fixed size.
1610          */
1611         r = (void *)r + RULESIZE(r);
1612         dynrules = (ipfw_dyn_rule *)r ;
1613         n = (void *)r - data;
1614         ndyn = (nbytes - n) / sizeof *dynrules;
1615
1616         /* if showing stats, figure out column widths ahead of time */
1617         bcwidth = pcwidth = 0;
1618         if (do_acct) {
1619                 for (n = 0, r = data; n < nstat;
1620                     n++, r = (void *)r + RULESIZE(r)) {
1621                         /* packet counter */
1622                         width = snprintf(NULL, 0, "%llu", r->pcnt);
1623                         if (width > pcwidth)
1624                                 pcwidth = width;
1625
1626                         /* byte counter */
1627                         width = snprintf(NULL, 0, "%llu", r->bcnt);
1628                         if (width > bcwidth)
1629                                 bcwidth = width;
1630                 }
1631         }
1632         if (do_dynamic && ndyn) {
1633                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1634                         width = snprintf(NULL, 0, "%llu", d->pcnt);
1635                         if (width > pcwidth)
1636                                 pcwidth = width;
1637
1638                         width = snprintf(NULL, 0, "%llu", d->bcnt);
1639                         if (width > bcwidth)
1640                                 bcwidth = width;
1641                 }
1642         }
1643         /* if no rule numbers were specified, list all rules */
1644         if (ac == 0) {
1645                 for (n = 0, r = data; n < nstat;
1646                     n++, r = (void *)r + RULESIZE(r) )
1647                         show_ipfw(r, pcwidth, bcwidth);
1648
1649                 if (do_dynamic && ndyn) {
1650                         printf("## Dynamic rules (%d):\n", ndyn);
1651                         for (n = 0, d = dynrules; n < ndyn; n++, d++)
1652                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1653                 }
1654                 goto done;
1655         }
1656
1657         /* display specific rules requested on command line */
1658
1659         for (lac = ac, lav = av; lac != 0; lac--) {
1660                 /* convert command line rule # */
1661                 rnum = strtoul(*lav++, &endptr, 10);
1662                 if (*endptr) {
1663                         exitval = EX_USAGE;
1664                         warnx("invalid rule number: %s", *(lav - 1));
1665                         continue;
1666                 }
1667                 for (n = seen = 0, r = data; n < nstat;
1668                     n++, r = (void *)r + RULESIZE(r) ) {
1669                         if (r->rulenum > rnum)
1670                                 break;
1671                         if (r->rulenum == rnum) {
1672                                 show_ipfw(r, pcwidth, bcwidth);
1673                                 seen = 1;
1674                         }
1675                 }
1676                 if (!seen) {
1677                         /* give precedence to other error(s) */
1678                         if (exitval == EX_OK)
1679                                 exitval = EX_UNAVAILABLE;
1680                         warnx("rule %lu does not exist", rnum);
1681                 }
1682         }
1683
1684         if (do_dynamic && ndyn) {
1685                 printf("## Dynamic rules:\n");
1686                 for (lac = ac, lav = av; lac != 0; lac--) {
1687                         rnum = strtoul(*lav++, &endptr, 10);
1688                         if (*endptr)
1689                                 /* already warned */
1690                                 continue;
1691                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1692                                 if ((int)(d->rule) > rnum)
1693                                         break;
1694                                 if ((int)(d->rule) == rnum)
1695                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1696                         }
1697                 }
1698         }
1699
1700         ac = 0;
1701
1702 done:
1703         free(data);
1704
1705         if (exitval != EX_OK)
1706                 exit(exitval);
1707 }
1708
1709 static void
1710 show_usage(void)
1711 {
1712         fprintf(stderr, "usage: ipfw [options]\n"
1713 "    add [number] rule\n"
1714 "    pipe number config [pipeconfig]\n"
1715 "    queue number config [queueconfig]\n"
1716 "    [pipe] flush\n"
1717 "    [pipe] delete number ...\n"
1718 "    [pipe] {list|show} [number ...]\n"
1719 "    {zero|resetlog} [number ...]\n"
1720 "do \"ipfw -h\" or see ipfw manpage for details\n"
1721 );
1722
1723         exit(EX_USAGE);
1724 }
1725
1726 static void
1727 help(void)
1728 {
1729
1730         fprintf(stderr, "ipfw syntax summary:\n"
1731 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1732 "ipfw {pipe|queue} N config BODY\n"
1733 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1734 "\n"
1735 "RULE:          [1..] [PROB] BODY\n"
1736 "RULENUM:       INTEGER(1..65534)\n"
1737 "PROB:          prob REAL(0..1)\n"
1738 "BODY:          check-state [LOG] (no body) |\n"
1739 "               ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1740 "ACTION:        check-state | allow | count | deny | reject | skipto N |\n"
1741 "               {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1742 "ADDR:          [ MAC dst src ether_type ] \n"
1743 "               [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1744 "IPLIST:        IPADDR | ( IPADDR or ... or IPADDR )\n"
1745 "IPADDR:        [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1746 "OPTION_LIST:   OPTION [,OPTION_LIST]\n"
1747 );
1748 exit(0);
1749 }
1750
1751
1752 static int
1753 lookup_host (char *host, struct in_addr *ipaddr)
1754 {
1755         struct hostent *he;
1756
1757         if (!inet_aton(host, ipaddr)) {
1758                 if ((he = gethostbyname(host)) == NULL)
1759                         return(-1);
1760                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1761         }
1762         return(0);
1763 }
1764
1765 /*
1766  * fills the addr and mask fields in the instruction as appropriate from av.
1767  * Update length as appropriate.
1768  * The following formats are allowed:
1769  *      any     matches any IP. Actually returns an empty instruction.
1770  *      me      returns O_IP_*_ME
1771  *      1.2.3.4         single IP address
1772  *      1.2.3.4:5.6.7.8 address:mask
1773  *      1.2.3.4/24      address/mask
1774  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1775  */
1776 static void
1777 fill_ip(ipfw_insn_ip *cmd, char *av)
1778 {
1779         char *p = 0, md = 0;
1780         u_int32_t i;
1781
1782         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1783
1784         if (!strncmp(av, "any", strlen(av)))
1785                 return;
1786
1787         if (!strncmp(av, "me", strlen(av))) {
1788                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1789                 return;
1790         }
1791
1792         p = strchr(av, '/');
1793         if (!p)
1794                 p = strchr(av, ':');
1795         if (p) {
1796                 md = *p;
1797                 *p++ = '\0';
1798         }
1799
1800         if (lookup_host(av, &cmd->addr) != 0)
1801                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1802         switch (md) {
1803         case ':':
1804                 if (!inet_aton(p, &cmd->mask))
1805                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1806                 break;
1807         case '/':
1808                 i = atoi(p);
1809                 if (i == 0)
1810                         cmd->mask.s_addr = htonl(0);
1811                 else if (i > 32)
1812                         errx(EX_DATAERR, "bad width ``%s''", p);
1813                 else
1814                         cmd->mask.s_addr = htonl(~0 << (32 - i));
1815                 break;
1816         default:
1817                 cmd->mask.s_addr = htonl(~0);
1818                 break;
1819         }
1820         cmd->addr.s_addr &= cmd->mask.s_addr;
1821         /*
1822          * now look if we have a set of addresses. They are stored as follows:
1823          *   arg1       is the set size (powers of 2, 2..256)
1824          *   addr       is the base address IN HOST FORMAT
1825          *   mask..     is an array of u_int32_t with bits set.
1826          */
1827         if (p)
1828                 p = strchr(p, '{');
1829         if (p) {        /* fetch addresses */
1830                 u_int32_t *d;
1831                 int low, high;
1832                 int i = contigmask((u_char *)&(cmd->mask), 32);
1833
1834                 if (i < 24 || i > 31) {
1835                         fprintf(stderr, "invalid set with mask %d\n",
1836                                 i);
1837                         exit(0);
1838                 }
1839                 cmd->o.arg1 = 1<<(32-i);
1840                 cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1841                 d = (u_int32_t *)&cmd->mask;
1842                 cmd->o.opcode = O_IP_DST_SET;   /* default */
1843                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1844                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
1845                         d[i] = 0;       /* clear masks */
1846
1847                 av = p+1;
1848                 low = cmd->addr.s_addr & 0xff;
1849                 high = low + cmd->o.arg1 - 1;
1850                 while (isdigit(*av)) {
1851                         char *s;
1852                         u_int16_t a = strtol(av, &s, 0);
1853
1854                         if (s == av) /* no parameter */
1855                                 break;
1856                         if (a < low || a > high) {
1857                             fprintf(stderr, "addr %d out of range [%d-%d]\n",
1858                                 a, low, high);
1859                             exit(0);
1860                         }
1861                         a -= low;
1862                         d[ a/32] |= 1<<(a & 31);
1863                         if (*s != ',')
1864                                 break;
1865                         av = s+1;
1866                 }
1867                 return;
1868         }
1869
1870         if (cmd->mask.s_addr == 0) { /* any */
1871                 if (cmd->o.len & F_NOT)
1872                         errx(EX_DATAERR, "not any never matches");
1873                 else    /* useless, nuke it */
1874                         return;
1875         } else if (cmd->mask.s_addr ==  IP_MASK_ALL)    /* one IP */
1876                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1877         else                                            /* addr/mask */
1878                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1879 }
1880
1881
1882 /*
1883  * helper function to process a set of flags and set bits in the
1884  * appropriate masks.
1885  */
1886 static void
1887 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
1888         struct _s_x *flags, char *p)
1889 {
1890         u_int8_t set=0, clear=0;
1891
1892         while (p && *p) {
1893                 char *q;        /* points to the separator */
1894                 int val;
1895                 u_int8_t *which;        /* mask we are working on */
1896
1897                 if (*p == '!') {
1898                         p++;
1899                         which = &clear;
1900                 } else
1901                         which = &set;
1902                 q = strchr(p, ',');
1903                 if (q)
1904                         *q++ = '\0';
1905                 val = match_token(flags, p);
1906                 if (val <= 0)
1907                         errx(EX_DATAERR, "invalid flag %s", p);
1908                 *which |= (u_int8_t)val;
1909                 p = q;
1910         }
1911         cmd->opcode = opcode;
1912         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
1913         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
1914 }
1915
1916
1917 static void
1918 delete(int ac, char *av[])
1919 {
1920         u_int32_t rulenum;
1921         struct dn_pipe pipe;
1922         int i;
1923         int exitval = EX_OK;
1924         int do_set = 0;
1925
1926         memset(&pipe, 0, sizeof pipe);
1927
1928         av++; ac--;
1929         if (ac > 0 && !strncmp(*av, "set", strlen(*av))) {
1930                 do_set = 1;     /* delete set */
1931                 ac--; av++;
1932         }
1933
1934         /* Rule number */
1935         while (ac && isdigit(**av)) {
1936                 i = atoi(*av); av++; ac--;
1937                 if (do_pipe) {
1938                         if (do_pipe == 1)
1939                                 pipe.pipe_nr = i;
1940                         else
1941                                 pipe.fs.fs_nr = i;
1942                         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
1943                             &pipe, sizeof pipe);
1944                         if (i) {
1945                                 exitval = 1;
1946                                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
1947                                     do_pipe == 1 ? pipe.pipe_nr :
1948                                     pipe.fs.fs_nr);
1949                         }
1950                 } else {
1951                         rulenum =  (i & 0xffff) | (do_set << 24);
1952                         i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
1953                             sizeof rulenum);
1954                         if (i) {
1955                                 exitval = EX_UNAVAILABLE;
1956                                 warn("rule %u: setsockopt(IP_FW_DEL)",
1957                                     rulenum);
1958                         }
1959                 }
1960         }
1961         if (exitval != EX_OK)
1962                 exit(exitval);
1963 }
1964
1965
1966 /*
1967  * fill the interface structure. We do not check the name as we can
1968  * create interfaces dynamically, so checking them at insert time
1969  * makes relatively little sense.
1970  * Interface names containing '*', '?', or '[' are assumed to be shell
1971  * patterns which match interfaces.
1972  */
1973 static void
1974 fill_iface(ipfw_insn_if *cmd, char *arg)
1975 {
1976         cmd->name[0] = '\0';
1977         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
1978
1979         /* Parse the interface or address */
1980         if (!strcmp(arg, "any"))
1981                 cmd->o.len = 0;         /* effectively ignore this command */
1982         else if (!isdigit(*arg)) {
1983                 strlcpy(cmd->name, arg, sizeof(cmd->name));
1984                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
1985         } else if (!inet_aton(arg, &cmd->p.ip))
1986                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
1987 }
1988
1989 static unsigned long
1990 getbw(const char *str, u_short *flags, int kb)
1991 {
1992     char *end;
1993     unsigned long val;
1994     int inbytes = 0;
1995
1996     val = strtoul(str, &end, 0);
1997     if (*end == 'k' || *end == 'K') {
1998         ++end;
1999         val *= kb;
2000     } else if (*end == 'm' || *end == 'M') {
2001         ++end;
2002         val *= kb * kb;
2003     }
2004
2005     /*
2006      * Deal with bits or bytes or b(bits) or B(bytes).  If there is no
2007      * trailer assume bits.
2008      */
2009     if (strncasecmp(end, "bit", 3) == 0) {
2010         ;
2011     } else if (strncasecmp(end, "byte", 4) == 0) {
2012         inbytes = 1;
2013     } else if (*end == 'b') {
2014         ;
2015     } else if (*end == 'B') {
2016         inbytes = 1;
2017     }
2018
2019     /*
2020      * Return in bits if flags is NULL, else flag bits
2021      * or bytes in flags and return the unconverted value.
2022      */
2023     if (inbytes && flags)
2024         *flags |= DN_QSIZE_IS_BYTES;
2025     else if (inbytes && flags == NULL)
2026         val *= 8;
2027     return(val);
2028 }
2029
2030 /*
2031  * the following macro returns an error message if we run out of
2032  * arguments.
2033  */
2034 #define NEED1(msg)      {if (!ac) errx(EX_USAGE, msg);}
2035
2036 static void
2037 config_pipe(int ac, char **av)
2038 {
2039         struct dn_pipe pipe;
2040         int i;
2041         char *end;
2042         u_int32_t a;
2043         void *par = NULL;
2044
2045         memset(&pipe, 0, sizeof pipe);
2046
2047         av++; ac--;
2048         /* Pipe number */
2049         if (ac && isdigit(**av)) {
2050                 i = atoi(*av); av++; ac--;
2051                 if (do_pipe == 1)
2052                         pipe.pipe_nr = i;
2053                 else
2054                         pipe.fs.fs_nr = i;
2055         }
2056         while (ac > 0) {
2057                 double d;
2058                 int tok = match_token(dummynet_params, *av);
2059                 ac--; av++;
2060
2061                 switch(tok) {
2062                 case TOK_NOERROR:
2063                         pipe.fs.flags_fs |= DN_NOERROR;
2064                         break;
2065
2066                 case TOK_PLR:
2067                         NEED1("plr needs argument 0..1\n");
2068                         d = strtod(av[0], NULL);
2069                         if (d > 1)
2070                                 d = 1;
2071                         else if (d < 0)
2072                                 d = 0;
2073                         pipe.fs.plr = (int)(d*0x7fffffff);
2074                         ac--; av++;
2075                         break;
2076
2077                 case TOK_QUEUE:
2078                         NEED1("queue needs queue size\n");
2079                         end = NULL;
2080                         pipe.fs.qsize = getbw(av[0], &pipe.fs.flags_fs, 1024);
2081                         ac--; av++;
2082                         break;
2083
2084                 case TOK_BUCKETS:
2085                         NEED1("buckets needs argument\n");
2086                         pipe.fs.rq_size = strtoul(av[0], NULL, 0);
2087                         ac--; av++;
2088                         break;
2089
2090                 case TOK_MASK:
2091                         NEED1("mask needs mask specifier\n");
2092                         /*
2093                          * per-flow queue, mask is dst_ip, dst_port,
2094                          * src_ip, src_port, proto measured in bits
2095                          */
2096                         par = NULL;
2097
2098                         pipe.fs.flow_mask.dst_ip = 0;
2099                         pipe.fs.flow_mask.src_ip = 0;
2100                         pipe.fs.flow_mask.dst_port = 0;
2101                         pipe.fs.flow_mask.src_port = 0;
2102                         pipe.fs.flow_mask.proto = 0;
2103                         end = NULL;
2104
2105                         while (ac >= 1) {
2106                             u_int32_t *p32 = NULL;
2107                             u_int16_t *p16 = NULL;
2108
2109                             tok = match_token(dummynet_params, *av);
2110                             ac--; av++;
2111                             switch(tok) {
2112                             case TOK_ALL:
2113                                     /*
2114                                      * special case, all bits significant
2115                                      */
2116                                     pipe.fs.flow_mask.dst_ip = ~0;
2117                                     pipe.fs.flow_mask.src_ip = ~0;
2118                                     pipe.fs.flow_mask.dst_port = ~0;
2119                                     pipe.fs.flow_mask.src_port = ~0;
2120                                     pipe.fs.flow_mask.proto = ~0;
2121                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2122                                     goto end_mask;
2123
2124                             case TOK_DSTIP:
2125                                     p32 = &pipe.fs.flow_mask.dst_ip;
2126                                     break;
2127
2128                             case TOK_SRCIP:
2129                                     p32 = &pipe.fs.flow_mask.src_ip;
2130                                     break;
2131
2132                             case TOK_DSTPORT:
2133                                     p16 = &pipe.fs.flow_mask.dst_port;
2134                                     break;
2135
2136                             case TOK_SRCPORT:
2137                                     p16 = &pipe.fs.flow_mask.src_port;
2138                                     break;
2139
2140                             case TOK_PROTO:
2141                                     break;
2142
2143                             default:
2144                                     ac++; av--; /* backtrack */
2145                                     goto end_mask;
2146                             }
2147                             if (ac < 1)
2148                                     errx(EX_USAGE, "mask: value missing");
2149                             if (*av[0] == '/') {
2150                                     a = strtoul(av[0]+1, &end, 0);
2151                                     a = (a == 32) ? ~0 : (1 << a) - 1;
2152                             } else
2153                                     a = strtoul(av[0], &end, 0);
2154                             if (p32 != NULL)
2155                                     *p32 = a;
2156                             else if (p16 != NULL) {
2157                                     if (a > 65535)
2158                                             errx(EX_DATAERR,
2159                                                 "mask: must be 16 bit");
2160                                     *p16 = (u_int16_t)a;
2161                             } else {
2162                                     if (a > 255)
2163                                             errx(EX_DATAERR,
2164                                                 "mask: must be 8 bit");
2165                                     pipe.fs.flow_mask.proto = (u_int8_t)a;
2166                             }
2167                             if (a != 0)
2168                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2169                             ac--; av++;
2170                         } /* end while, config masks */
2171 end_mask:
2172                         break;
2173
2174                 case TOK_RED:
2175                 case TOK_GRED:
2176                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
2177                         pipe.fs.flags_fs |= DN_IS_RED;
2178                         if (tok == TOK_GRED)
2179                                 pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
2180                         /*
2181                          * the format for parameters is w_q/min_th/max_th/max_p
2182                          */
2183                         if ((end = strsep(&av[0], "/"))) {
2184                             double w_q = strtod(end, NULL);
2185                             if (w_q > 1 || w_q <= 0)
2186                                 errx(EX_DATAERR, "0 < w_q <= 1");
2187                             pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
2188                         }
2189                         if ((end = strsep(&av[0], "/"))) {
2190                             pipe.fs.min_th = strtoul(end, &end, 0);
2191                             if (*end == 'K' || *end == 'k')
2192                                 pipe.fs.min_th *= 1024;
2193                         }
2194                         if ((end = strsep(&av[0], "/"))) {
2195                             pipe.fs.max_th = strtoul(end, &end, 0);
2196                             if (*end == 'K' || *end == 'k')
2197                                 pipe.fs.max_th *= 1024;
2198                         }
2199                         if ((end = strsep(&av[0], "/"))) {
2200                             double max_p = strtod(end, NULL);
2201                             if (max_p > 1 || max_p <= 0)
2202                                 errx(EX_DATAERR, "0 < max_p <= 1");
2203                             pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
2204                         }
2205                         ac--; av++;
2206                         break;
2207
2208                 case TOK_DROPTAIL:
2209                         pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
2210                         break;
2211
2212                 case TOK_BW:
2213                         NEED1("bw needs bandwidth or interface\n");
2214                         if (do_pipe != 1)
2215                             errx(EX_DATAERR, "bandwidth only valid for pipes");
2216                         /*
2217                          * set clocking interface or bandwidth value
2218                          */
2219                         if (av[0][0] >= 'a' && av[0][0] <= 'z') {
2220                             int l = sizeof(pipe.if_name)-1;
2221                             /* interface name */
2222                             strncpy(pipe.if_name, av[0], l);
2223                             pipe.if_name[l] = '\0';
2224                             pipe.bandwidth = 0;
2225                         } else {
2226                             pipe.if_name[0] = '\0';
2227                             pipe.bandwidth = strtoul(av[0], &end, 0);
2228                             pipe.bandwidth = getbw(av[0], NULL, 1000);
2229                             if (pipe.bandwidth < 0)
2230                                 errx(EX_DATAERR, "bandwidth too large");
2231                         }
2232                         ac--; av++;
2233                         break;
2234
2235                 case TOK_DELAY:
2236                         if (do_pipe != 1)
2237                                 errx(EX_DATAERR, "delay only valid for pipes");
2238                         NEED1("delay needs argument 0..10000ms\n");
2239                         pipe.delay = strtoul(av[0], NULL, 0);
2240                         ac--; av++;
2241                         break;
2242
2243                 case TOK_WEIGHT:
2244                         if (do_pipe == 1)
2245                                 errx(EX_DATAERR,"weight only valid for queues");
2246                         NEED1("weight needs argument 0..100\n");
2247                         pipe.fs.weight = strtoul(av[0], &end, 0);
2248                         ac--; av++;
2249                         break;
2250
2251                 case TOK_PIPE:
2252                         if (do_pipe == 1)
2253                                 errx(EX_DATAERR,"pipe only valid for queues");
2254                         NEED1("pipe needs pipe_number\n");
2255                         pipe.fs.parent_nr = strtoul(av[0], &end, 0);
2256                         ac--; av++;
2257                         break;
2258
2259                 default:
2260                         errx(EX_DATAERR, "unrecognised option ``%s''", *av);
2261                 }
2262         }
2263         if (do_pipe == 1) {
2264                 if (pipe.pipe_nr == 0)
2265                         errx(EX_DATAERR, "pipe_nr must be > 0");
2266                 if (pipe.delay > 10000)
2267                         errx(EX_DATAERR, "delay must be < 10000");
2268         } else { /* do_pipe == 2, queue */
2269                 if (pipe.fs.parent_nr == 0)
2270                         errx(EX_DATAERR, "pipe must be > 0");
2271                 if (pipe.fs.weight >100)
2272                         errx(EX_DATAERR, "weight must be <= 100");
2273         }
2274         if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
2275                 if (pipe.fs.qsize > 1024*1024)
2276                         errx(EX_DATAERR, "queue size must be < 1MB");
2277         } else {
2278                 if (pipe.fs.qsize > 100)
2279                         errx(EX_DATAERR, "2 <= queue size <= 100");
2280         }
2281         if (pipe.fs.flags_fs & DN_IS_RED) {
2282                 size_t len;
2283                 int lookup_depth, avg_pkt_size;
2284                 double s, idle, weight, w_q;
2285                 struct clockinfo clock;
2286                 int t;
2287
2288                 if (pipe.fs.min_th >= pipe.fs.max_th)
2289                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
2290                         pipe.fs.min_th, pipe.fs.max_th);
2291                 if (pipe.fs.max_th == 0)
2292                     errx(EX_DATAERR, "max_th must be > 0");
2293
2294                 len = sizeof(int);
2295                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
2296                         &lookup_depth, &len, NULL, 0) == -1)
2297
2298                     errx(1, "sysctlbyname(\"%s\")",
2299                         "net.inet.ip.dummynet.red_lookup_depth");
2300                 if (lookup_depth == 0)
2301                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2302                         " must be greater than zero");
2303
2304                 len = sizeof(int);
2305                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2306                         &avg_pkt_size, &len, NULL, 0) == -1)
2307
2308                     errx(1, "sysctlbyname(\"%s\")",
2309                         "net.inet.ip.dummynet.red_avg_pkt_size");
2310                 if (avg_pkt_size == 0)
2311                         errx(EX_DATAERR,
2312                             "net.inet.ip.dummynet.red_avg_pkt_size must"
2313                             " be greater than zero");
2314
2315                 len = sizeof(struct clockinfo);
2316                 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1)
2317                         errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
2318
2319                 /*
2320                  * Ticks needed for sending a medium-sized packet.
2321                  * Unfortunately, when we are configuring a WF2Q+ queue, we
2322                  * do not have bandwidth information, because that is stored
2323                  * in the parent pipe, and also we have multiple queues
2324                  * competing for it. So we set s=0, which is not very
2325                  * correct. But on the other hand, why do we want RED with
2326                  * WF2Q+ ?
2327                  */
2328                 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2329                         s = 0;
2330                 else
2331                         s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth;
2332
2333                 /*
2334                  * max idle time (in ticks) before avg queue size becomes 0.
2335                  * NOTA:  (3/w_q) is approx the value x so that
2336                  * (1-w_q)^x < 10^-3.
2337                  */
2338                 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2339                 idle = s * 3. / w_q;
2340                 pipe.fs.lookup_step = (int)idle / lookup_depth;
2341                 if (!pipe.fs.lookup_step)
2342                         pipe.fs.lookup_step = 1;
2343                 weight = 1 - w_q;
2344                 for (t = pipe.fs.lookup_step; t > 0; --t)
2345                         weight *= weight;
2346                 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2347         }
2348         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2349                             sizeof pipe);
2350         if (i)
2351                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2352 }
2353
2354 static void
2355 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2356 {
2357         int i, l;
2358
2359         for (i=0; i<6; i++)
2360                 addr[i] = mask[i] = 0;
2361         if (!strcmp(p, "any"))
2362                 return;
2363
2364         for (i=0; *p && i<6;i++, p++) {
2365                 addr[i] = strtol(p, &p, 16);
2366                 if (*p != ':') /* we start with the mask */
2367                         break;
2368         }
2369         if (*p == '/') { /* mask len */
2370                 l = strtol(p+1, &p, 0);
2371                 for (i=0; l>0; l -=8, i++)
2372                         mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
2373         } else if (*p == '&') { /* mask */
2374                 for (i=0, p++; *p && i<6;i++, p++) {
2375                         mask[i] = strtol(p, &p, 16);
2376                         if (*p != ':')
2377                                 break;
2378                 }
2379         } else if (*p == '\0') {
2380                 for (i=0; i<6; i++)
2381                         mask[i] = 0xff;
2382         }
2383         for (i=0; i<6; i++)
2384                 addr[i] &= mask[i];
2385 }
2386
2387 /*
2388  * helper function, updates the pointer to cmd with the length
2389  * of the current command, and also cleans up the first word of
2390  * the new command in case it has been clobbered before.
2391  */
2392 static ipfw_insn *
2393 next_cmd(ipfw_insn *cmd)
2394 {
2395         cmd += F_LEN(cmd);
2396         bzero(cmd, sizeof(*cmd));
2397         return cmd;
2398 }
2399
2400 /*
2401  * A function to fill simple commands of size 1.
2402  * Existing flags are preserved.
2403  */
2404 static void
2405 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2406 {
2407         cmd->opcode = opcode;
2408         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2409         cmd->arg1 = arg;
2410 }
2411
2412 /*
2413  * Fetch and add the MAC address and type, with masks. This generates one or
2414  * two microinstructions, and returns the pointer to the last one.
2415  */
2416 static ipfw_insn *
2417 add_mac(ipfw_insn *cmd, int ac, char *av[])
2418 {
2419         ipfw_insn_mac *mac;
2420
2421         if (ac < 2)
2422                 errx(EX_DATAERR, "MAC dst src");
2423
2424         cmd->opcode = O_MACADDR2;
2425         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2426
2427         mac = (ipfw_insn_mac *)cmd;
2428         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2429         get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2430         return cmd;
2431 }
2432
2433 static ipfw_insn *
2434 add_mactype(ipfw_insn *cmd, int ac, char *av)
2435 {
2436         if (ac < 1)
2437                 errx(EX_DATAERR, "missing MAC type");
2438         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2439                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2440                 cmd->opcode = O_MAC_TYPE;
2441                 return cmd;
2442         } else
2443                 return NULL;
2444 }
2445
2446 static ipfw_insn *
2447 add_proto(ipfw_insn *cmd, char *av)
2448 {
2449         struct protoent *pe;
2450         u_char proto = 0;
2451
2452         if (!strncmp(av, "all", strlen(av)))
2453                 ; /* same as "ip" */
2454         else if ((proto = atoi(av)) > 0)
2455                 ; /* all done! */
2456         else if ((pe = getprotobyname(av)) != NULL)
2457                 proto = pe->p_proto;
2458         else
2459                 return NULL;
2460         if (proto != IPPROTO_IP)
2461                 fill_cmd(cmd, O_PROTO, 0, proto);
2462         return cmd;
2463 }
2464
2465 static ipfw_insn *
2466 add_srcip(ipfw_insn *cmd, char *av)
2467 {
2468         fill_ip((ipfw_insn_ip *)cmd, av);
2469         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2470                 cmd->opcode = O_IP_SRC_SET;
2471         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2472                 cmd->opcode = O_IP_SRC_ME;
2473         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2474                 cmd->opcode = O_IP_SRC;
2475         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2476                 cmd->opcode = O_IP_SRC_MASK;
2477         return cmd;
2478 }
2479
2480 static ipfw_insn *
2481 add_dstip(ipfw_insn *cmd, char *av)
2482 {
2483         fill_ip((ipfw_insn_ip *)cmd, av);
2484         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2485                 ;
2486         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2487                 cmd->opcode = O_IP_DST_ME;
2488         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2489                 cmd->opcode = O_IP_DST;
2490         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2491                 cmd->opcode = O_IP_DST_MASK;
2492         return cmd;
2493 }
2494
2495 static ipfw_insn *
2496 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2497 {
2498         if (!strncmp(av, "any", strlen(av))) {
2499                 return NULL;
2500         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2501                 /* XXX todo: check that we have a protocol with ports */
2502                 cmd->opcode = opcode;
2503                 return cmd;
2504         }
2505         return NULL;
2506 }
2507
2508 /*
2509  * Parse arguments and assemble the microinstructions which make up a rule.
2510  * Rules are added into the 'rulebuf' and then copied in the correct order
2511  * into the actual rule.
2512  *
2513  * The syntax for a rule starts with the action, followed by an
2514  * optional log action, and the various match patterns.
2515  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2516  * (generated if the rule includes a keep-state option), then the
2517  * various match patterns, the "log" action, and the actual action.
2518  *
2519  */
2520 static void
2521 add(int ac, char *av[])
2522 {
2523         /*
2524          * rules are added into the 'rulebuf' and then copied in
2525          * the correct order into the actual rule.
2526          * Some things that need to go out of order (prob, action etc.)
2527          * go into actbuf[].
2528          */
2529         static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255];
2530
2531         ipfw_insn *src, *dst, *cmd, *action, *prev = NULL;
2532         ipfw_insn *first_cmd;   /* first match pattern */
2533
2534         struct ip_fw *rule;
2535
2536         /*
2537          * various flags used to record that we entered some fields.
2538          */
2539         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2540
2541         int i;
2542
2543         int open_par = 0;       /* open parenthesis ( */
2544
2545         /* proto is here because it is used to fetch ports */
2546         u_char proto = IPPROTO_IP;      /* default protocol */
2547
2548         double match_prob = 1; /* match probability, default is always match */
2549
2550         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2551         bzero(cmdbuf, sizeof(cmdbuf));
2552         bzero(rulebuf, sizeof(rulebuf));
2553
2554         rule = (struct ip_fw *)rulebuf;
2555         cmd = (ipfw_insn *)cmdbuf;
2556         action = (ipfw_insn *)actbuf;
2557
2558         av++; ac--;
2559
2560         /* [rule N]     -- Rule number optional */
2561         if (ac && isdigit(**av)) {
2562                 rule->rulenum = atoi(*av);
2563                 av++;
2564                 ac--;
2565         }
2566
2567         /* [set N]      -- set number (0..30), optional */
2568         if (ac > 1 && !strncmp(*av, "set", strlen(*av))) {
2569                 int set = strtoul(av[1], NULL, 10);
2570                 if (set < 0 || set > 30)
2571                         errx(EX_DATAERR, "illegal set %s", av[1]);
2572                 rule->set = set;
2573                 av += 2; ac -= 2;
2574         }
2575
2576         /* [prob D]     -- match probability, optional */
2577         if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2578                 match_prob = strtod(av[1], NULL);
2579
2580                 if (match_prob <= 0 || match_prob > 1)
2581                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2582                 av += 2; ac -= 2;
2583         }
2584
2585         /* action       -- mandatory */
2586         NEED1("missing action");
2587         i = match_token(rule_actions, *av);
2588         ac--; av++;
2589         action->len = 1;        /* default */
2590         switch(i) {
2591         case TOK_CHECKSTATE:
2592                 have_state = action;
2593                 action->opcode = O_CHECK_STATE;
2594                 break;
2595
2596         case TOK_ACCEPT:
2597                 action->opcode = O_ACCEPT;
2598                 break;
2599
2600         case TOK_DENY:
2601                 action->opcode = O_DENY;
2602                 action->arg1 = 0;
2603                 break;
2604
2605         case TOK_REJECT:
2606                 action->opcode = O_REJECT;
2607                 action->arg1 = ICMP_UNREACH_HOST;
2608                 break;
2609
2610         case TOK_RESET:
2611                 action->opcode = O_REJECT;
2612                 action->arg1 = ICMP_REJECT_RST;
2613                 break;
2614
2615         case TOK_UNREACH:
2616                 action->opcode = O_REJECT;
2617                 NEED1("missing reject code");
2618                 fill_reject_code(&action->arg1, *av);
2619                 ac--; av++;
2620                 break;
2621
2622         case TOK_COUNT:
2623                 action->opcode = O_COUNT;
2624                 break;
2625
2626         case TOK_QUEUE:
2627         case TOK_PIPE:
2628                 action->len = F_INSN_SIZE(ipfw_insn_pipe);
2629         case TOK_SKIPTO:
2630                 if (i == TOK_QUEUE)
2631                         action->opcode = O_QUEUE;
2632                 else if (i == TOK_PIPE)
2633                         action->opcode = O_PIPE;
2634                 else if (i == TOK_SKIPTO)
2635                         action->opcode = O_SKIPTO;
2636                 NEED1("missing skipto/pipe/queue number");
2637                 action->arg1 = strtoul(*av, NULL, 10);
2638                 av++; ac--;
2639                 break;
2640
2641         case TOK_DIVERT:
2642         case TOK_TEE:
2643                 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2644                 NEED1("missing divert/tee port");
2645                 action->arg1 = strtoul(*av, NULL, 0);
2646                 if (action->arg1 == 0) {
2647                         struct servent *s;
2648                         setservent(1);
2649                         s = getservbyname(av[0], "divert");
2650                         if (s != NULL)
2651                                 action->arg1 = ntohs(s->s_port);
2652                         else
2653                                 errx(EX_DATAERR, "illegal divert/tee port");
2654                 }
2655                 ac--; av++;
2656                 break;
2657
2658         case TOK_FORWARD: {
2659                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2660                 char *s, *end;
2661
2662                 NEED1("missing forward address[:port]");
2663
2664                 action->opcode = O_FORWARD_IP;
2665                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2666
2667                 p->sa.sin_len = sizeof(struct sockaddr_in);
2668                 p->sa.sin_family = AF_INET;
2669                 p->sa.sin_port = 0;
2670                 /*
2671                  * locate the address-port separator (':' or ',')
2672                  */
2673                 s = strchr(*av, ':');
2674                 if (s == NULL)
2675                         s = strchr(*av, ',');
2676                 if (s != NULL) {
2677                         *(s++) = '\0';
2678                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2679                         if (s == end)
2680                                 errx(EX_DATAERR,
2681                                     "illegal forwarding port ``%s''", s);
2682                         p->sa.sin_port = (u_short)i;
2683                 }
2684                 lookup_host(*av, &(p->sa.sin_addr));
2685                 }
2686                 ac--; av++;
2687                 break;
2688
2689         default:
2690                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2691         }
2692         action = next_cmd(action);
2693
2694         /*
2695          * [log [logamount N]]  -- log, optional
2696          *
2697          * If exists, it goes first in the cmdbuf, but then it is
2698          * skipped in the copy section to the end of the buffer.
2699          */
2700         if (ac && !strncmp(*av, "log", strlen(*av))) {
2701                 ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2702
2703                 cmd->len = F_INSN_SIZE(ipfw_insn_log);
2704                 cmd->opcode = O_LOG;
2705                 av++; ac--;
2706                 if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2707                         ac--; av++;
2708                         NEED1("logamount requires argument");
2709                         c->max_log = atoi(*av);
2710                         if (c->max_log < 0)
2711                                 errx(EX_DATAERR, "logamount must be positive");
2712                         ac--; av++;
2713                 }
2714                 cmd = next_cmd(cmd);
2715         }
2716
2717         if (have_state) /* must be a check-state, we are done */
2718                 goto done;
2719
2720 #define OR_START(target)                                        \
2721         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2722                 if (open_par)                                   \
2723                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2724                 prev = NULL;                                    \
2725                 open_par = 1;                                   \
2726                 if ( (av[0])[1] == '\0') {                      \
2727                         ac--; av++;                             \
2728                 } else                                          \
2729                         (*av)++;                                \
2730         }                                                       \
2731         target:                                                 \
2732
2733
2734 #define CLOSE_PAR                                               \
2735         if (open_par) {                                         \
2736                 if (ac && (                                     \
2737                     !strncmp(*av, ")", strlen(*av)) ||          \
2738                     !strncmp(*av, "}", strlen(*av)) )) {        \
2739                         prev = NULL;                            \
2740                         open_par = 0;                           \
2741                         ac--; av++;                             \
2742                 } else                                          \
2743                         errx(EX_USAGE, "missing \")\"\n");      \
2744         }
2745
2746 #define NOT_BLOCK                                               \
2747         if (ac && !strncmp(*av, "not", strlen(*av))) {          \
2748                 if (cmd->len & F_NOT)                           \
2749                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2750                 cmd->len |= F_NOT;                              \
2751                 ac--; av++;                                     \
2752         }
2753
2754 #define OR_BLOCK(target)                                        \
2755         if (ac && !strncmp(*av, "or", strlen(*av))) {           \
2756                 if (prev == NULL || open_par == 0)              \
2757                         errx(EX_DATAERR, "invalid OR block");   \
2758                 prev->len |= F_OR;                              \
2759                 ac--; av++;                                     \
2760                 goto target;                                    \
2761         }                                                       \
2762         CLOSE_PAR;
2763
2764         first_cmd = cmd;
2765
2766 #if 0
2767         /*
2768          * MAC addresses, optional.
2769          * If we have this, we skip the part "proto from src to dst"
2770          * and jump straight to the option parsing.
2771          */
2772         NOT_BLOCK;
2773         NEED1("missing protocol");
2774         if (!strncmp(*av, "MAC", strlen(*av)) ||
2775             !strncmp(*av, "mac", strlen(*av))) {
2776                 ac--; av++;     /* the "MAC" keyword */
2777                 add_mac(cmd, ac, av); /* exits in case of errors */
2778                 cmd = next_cmd(cmd);
2779                 ac -= 2; av += 2;       /* dst-mac and src-mac */
2780                 NOT_BLOCK;
2781                 NEED1("missing mac type");
2782                 if (add_mactype(cmd, ac, av[0]))
2783                         cmd = next_cmd(cmd);
2784                 ac--; av++;     /* any or mac-type */
2785                 goto read_options;
2786         }
2787 #endif
2788
2789         /*
2790          * protocol, mandatory
2791          */
2792     OR_START(get_proto);
2793         NOT_BLOCK;
2794         NEED1("missing protocol");
2795         if (add_proto(cmd, *av)) {
2796                 av++; ac--;
2797                 if (F_LEN(cmd) == 0)    /* plain IP */
2798                         proto = 0;
2799                 else {
2800                         proto = cmd->arg1;
2801                         prev = cmd;
2802                         cmd = next_cmd(cmd);
2803                 }
2804         } else if (first_cmd != cmd) {
2805                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2806         } else
2807                 goto read_options;
2808     OR_BLOCK(get_proto);
2809
2810         /*
2811          * "from", mandatory
2812          */
2813         if (!ac || strncmp(*av, "from", strlen(*av)))
2814                 errx(EX_USAGE, "missing ``from''");
2815         ac--; av++;
2816
2817         /*
2818          * source IP, mandatory
2819          */
2820     OR_START(source_ip);
2821         NOT_BLOCK;      /* optional "not" */
2822         NEED1("missing source address");
2823         if (add_srcip(cmd, *av)) {
2824                 ac--; av++;
2825                 if (F_LEN(cmd) != 0) {  /* ! any */
2826                         prev = cmd;
2827                         cmd = next_cmd(cmd);
2828                 }
2829         }
2830     OR_BLOCK(source_ip);
2831
2832         /*
2833          * source ports, optional
2834          */
2835         NOT_BLOCK;      /* optional "not" */
2836         if (ac) {
2837                 if (!strncmp(*av, "any", strlen(*av)) ||
2838                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
2839                         ac--; av++;
2840                         if (F_LEN(cmd) != 0)
2841                                 cmd = next_cmd(cmd);
2842                 }
2843         }
2844
2845         /*
2846          * "to", mandatory
2847          */
2848         if (!ac || strncmp(*av, "to", strlen(*av)))
2849                 errx(EX_USAGE, "missing ``to''");
2850         av++; ac--;
2851
2852         /*
2853          * destination, mandatory
2854          */
2855     OR_START(dest_ip);
2856         NOT_BLOCK;      /* optional "not" */
2857         NEED1("missing dst address");
2858         if (add_dstip(cmd, *av)) {
2859                 ac--; av++;
2860                 if (F_LEN(cmd) != 0) {  /* ! any */
2861                         prev = cmd;
2862                         cmd = next_cmd(cmd);
2863                 }
2864         }
2865     OR_BLOCK(dest_ip);
2866
2867         /*
2868          * dest. ports, optional
2869          */
2870         NOT_BLOCK;      /* optional "not" */
2871         if (ac) {
2872                 if (!strncmp(*av, "any", strlen(*av)) ||
2873                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
2874                         ac--; av++;
2875                         if (F_LEN(cmd) != 0)
2876                                 cmd = next_cmd(cmd);
2877                 }
2878         }
2879
2880 read_options:
2881         if (ac && first_cmd == cmd) {
2882                 /*
2883                  * nothing specified so far, store in the rule to ease
2884                  * printout later.
2885                  */
2886                  rule->_pad = 1;
2887         }
2888         prev = NULL;
2889         while (ac) {
2890                 char *s;
2891                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
2892
2893                 s = *av;
2894                 cmd32 = (ipfw_insn_u32 *)cmd;
2895
2896                 if (*s == '!') {        /* alternate syntax for NOT */
2897                         if (cmd->len & F_NOT)
2898                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2899                         cmd->len = F_NOT;
2900                         s++;
2901                 }
2902                 i = match_token(rule_options, s);
2903                 ac--; av++;
2904                 switch(i) {
2905                 case TOK_NOT:
2906                         if (cmd->len & F_NOT)
2907                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2908                         cmd->len = F_NOT;
2909                         break;
2910
2911                 case TOK_OR:
2912                         if (open_par == 0 || prev == NULL)
2913                                 errx(EX_USAGE, "invalid \"or\" block\n");
2914                         prev->len |= F_OR;
2915                         break;
2916
2917                 case TOK_STARTBRACE:
2918                         if (open_par)
2919                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
2920                         open_par = 1;
2921                         break;
2922
2923                 case TOK_ENDBRACE:
2924                         if (!open_par)
2925                                 errx(EX_USAGE, "+missing \")\"\n");
2926                         open_par = 0;
2927                         prev = NULL;
2928                         break;
2929
2930                 case TOK_IN:
2931                         fill_cmd(cmd, O_IN, 0, 0);
2932                         break;
2933
2934                 case TOK_OUT:
2935                         cmd->len ^= F_NOT; /* toggle F_NOT */
2936                         fill_cmd(cmd, O_IN, 0, 0);
2937                         break;
2938
2939                 case TOK_FRAG:
2940                         fill_cmd(cmd, O_FRAG, 0, 0);
2941                         break;
2942
2943                 case TOK_LAYER2:
2944                         fill_cmd(cmd, O_LAYER2, 0, 0);
2945                         break;
2946
2947                 case TOK_XMIT:
2948                 case TOK_RECV:
2949                 case TOK_VIA:
2950                         NEED1("recv, xmit, via require interface name"
2951                                 " or address");
2952                         fill_iface((ipfw_insn_if *)cmd, av[0]);
2953                         ac--; av++;
2954                         if (F_LEN(cmd) == 0)    /* not a valid address */
2955                                 break;
2956                         if (i == TOK_XMIT)
2957                                 cmd->opcode = O_XMIT;
2958                         else if (i == TOK_RECV)
2959                                 cmd->opcode = O_RECV;
2960                         else if (i == TOK_VIA)
2961                                 cmd->opcode = O_VIA;
2962                         break;
2963
2964                 case TOK_ICMPTYPES:
2965                         NEED1("icmptypes requires list of types");
2966                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
2967                         av++; ac--;
2968                         break;
2969
2970                 case TOK_IPTTL:
2971                         NEED1("ipttl requires TTL");
2972                         fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
2973                         ac--; av++;
2974                         break;
2975
2976                 case TOK_IPID:
2977                         NEED1("ipid requires length");
2978                         fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
2979                         ac--; av++;
2980                         break;
2981
2982                 case TOK_IPLEN:
2983                         NEED1("iplen requires length");
2984                         fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
2985                         ac--; av++;
2986                         break;
2987
2988                 case TOK_IPVER:
2989                         NEED1("ipver requires version");
2990                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
2991                         ac--; av++;
2992                         break;
2993
2994                 case TOK_IPPRECEDENCE:
2995                         NEED1("ipprecedence requires value");
2996                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
2997                             (strtoul(*av, NULL, 0) & 7) << 5);
2998                         ac--; av++;
2999                         break;
3000
3001                 case TOK_IPOPTS:
3002                         NEED1("missing argument for ipoptions");
3003                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3004                         ac--; av++;
3005                         break;
3006
3007                 case TOK_IPTOS:
3008                         NEED1("missing argument for iptos");
3009                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3010                         ac--; av++;
3011                         break;
3012
3013                 case TOK_UID:
3014                         NEED1("uid requires argument");
3015                     {
3016                         char *end;
3017                         uid_t uid;
3018                         struct passwd *pwd;
3019
3020                         cmd->opcode = O_UID;
3021                         uid = strtoul(*av, &end, 0);
3022                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3023                         if (pwd == NULL)
3024                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3025                         cmd32->d[0] = pwd->pw_uid;
3026                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3027                         ac--; av++;
3028                     }
3029                         break;
3030
3031                 case TOK_GID:
3032                         NEED1("gid requires argument");
3033                     {
3034                         char *end;
3035                         gid_t gid;
3036                         struct group *grp;
3037
3038                         cmd->opcode = O_GID;
3039                         gid = strtoul(*av, &end, 0);
3040                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3041                         if (grp == NULL)
3042                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3043                         cmd32->d[0] = grp->gr_gid;
3044                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3045                         ac--; av++;
3046                     }
3047                         break;
3048
3049                 case TOK_ESTAB:
3050                         fill_cmd(cmd, O_ESTAB, 0, 0);
3051                         break;
3052
3053                 case TOK_SETUP:
3054                         fill_cmd(cmd, O_TCPFLAGS, 0,
3055                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3056                         break;
3057
3058                 case TOK_TCPOPTS:
3059                         NEED1("missing argument for tcpoptions");
3060                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3061                         ac--; av++;
3062                         break;
3063
3064                 case TOK_TCPSEQ:
3065                 case TOK_TCPACK:
3066                         NEED1("tcpseq/tcpack requires argument");
3067                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3068                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3069                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3070                         ac--; av++;
3071                         break;
3072
3073                 case TOK_TCPWIN:
3074                         NEED1("tcpwin requires length");
3075                         fill_cmd(cmd, O_TCPWIN, 0,
3076                             htons(strtoul(*av, NULL, 0)));
3077                         ac--; av++;
3078                         break;
3079
3080                 case TOK_TCPFLAGS:
3081                         NEED1("missing argument for tcpflags");
3082                         cmd->opcode = O_TCPFLAGS;
3083                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3084                         ac--; av++;
3085                         break;
3086
3087                 case TOK_KEEPSTATE:
3088                         if (open_par)
3089                                 errx(EX_USAGE, "keep-state cannot be part "
3090                                     "of an or block");
3091                         if (have_state)
3092                                 errx(EX_USAGE, "only one of keep-state "
3093                                         "and limit is allowed");
3094                         have_state = cmd;
3095                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3096                         break;
3097
3098                 case TOK_LIMIT:
3099                         if (open_par)
3100                                 errx(EX_USAGE, "limit cannot be part "
3101                                     "of an or block");
3102                         if (have_state)
3103                                 errx(EX_USAGE, "only one of keep-state "
3104                                         "and limit is allowed");
3105                         NEED1("limit needs mask and # of connections");
3106                         have_state = cmd;
3107                     {
3108                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3109
3110                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3111                         cmd->opcode = O_LIMIT;
3112                         c->limit_mask = 0;
3113                         c->conn_limit = 0;
3114                         for (; ac >1 ;) {
3115                                 int val;
3116
3117                                 val = match_token(limit_masks, *av);
3118                                 if (val <= 0)
3119                                         break;
3120                                 c->limit_mask |= val;
3121                                 ac--; av++;
3122                         }
3123                         c->conn_limit = atoi(*av);
3124                         if (c->conn_limit == 0)
3125                                 errx(EX_USAGE, "limit: limit must be >0");
3126                         if (c->limit_mask == 0)
3127                                 errx(EX_USAGE, "missing limit mask");
3128                         ac--; av++;
3129                     }
3130                         break;
3131
3132                 case TOK_PROTO:
3133                         NEED1("missing protocol");
3134                         if (add_proto(cmd, *av)) {
3135                                 proto = cmd->arg1;
3136                                 ac--; av++;
3137                         } else
3138                                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3139                         break;
3140
3141                 case TOK_SRCIP:
3142                         NEED1("missing source IP");
3143                         if (add_srcip(cmd, *av)) {
3144                                 ac--; av++;
3145                         }
3146                         break;
3147
3148                 case TOK_DSTIP:
3149                         NEED1("missing destination IP");
3150                         if (add_dstip(cmd, *av)) {
3151                                 ac--; av++;
3152                         }
3153                         break;
3154
3155                 case TOK_SRCPORT:
3156                         NEED1("missing source port");
3157                         if (!strncmp(*av, "any", strlen(*av)) ||
3158                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3159                                 ac--; av++;
3160                         } else
3161                                 errx(EX_DATAERR, "invalid source port %s", *av);
3162                         break;
3163
3164                 case TOK_DSTPORT:
3165                         NEED1("missing destination port");
3166                         if (!strncmp(*av, "any", strlen(*av)) ||
3167                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3168                                 ac--; av++;
3169                         } else
3170                                 errx(EX_DATAERR, "invalid destination port %s",
3171                                     *av);
3172                         break;
3173
3174                 case TOK_MAC:
3175                         if (ac < 2)
3176                                 errx(EX_USAGE, "MAC dst-mac src-mac");
3177                         if (add_mac(cmd, ac, av)) {
3178                                 ac -= 2; av += 2;
3179                         }
3180                         break;
3181
3182                 case TOK_MACTYPE:
3183                         NEED1("missing mac type");
3184                         if (!add_mactype(cmd, ac, *av))
3185                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3186                         ac--; av++;
3187                         break;
3188
3189                 default:
3190                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3191                 }
3192                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3193                         prev = cmd;
3194                         cmd = next_cmd(cmd);
3195                 }
3196         }
3197
3198 done:
3199         /*
3200          * Now copy stuff into the rule.
3201          * If we have a keep-state option, the first instruction
3202          * must be a PROBE_STATE (which is generated here).
3203          * If we have a LOG option, it was stored as the first command,
3204          * and now must be moved to the top of the action part.
3205          */
3206         dst = (ipfw_insn *)rule->cmd;
3207
3208         /*
3209          * First thing to write into the command stream is the match probability.
3210          */
3211         if (match_prob != 1) { /* 1 means always match */
3212                 dst->opcode = O_PROB;
3213                 dst->len = 2;
3214                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3215                 dst += dst->len;
3216         }
3217
3218         /*
3219          * generate O_PROBE_STATE if necessary
3220          */
3221         if (have_state && have_state->opcode != O_CHECK_STATE) {
3222                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3223                 dst = next_cmd(dst);
3224         }
3225         /*
3226          * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT
3227          */
3228         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3229                 i = F_LEN(src);
3230
3231                 switch (src->opcode) {
3232                 case O_LOG:
3233                 case O_KEEP_STATE:
3234                 case O_LIMIT:
3235                         break;
3236                 default:
3237                         bcopy(src, dst, i * sizeof(u_int32_t));
3238                         dst += i;
3239                 }
3240         }
3241
3242         /*
3243          * put back the have_state command as last opcode
3244          */
3245         if (have_state && have_state->opcode != O_CHECK_STATE) {
3246                 i = F_LEN(have_state);
3247                 bcopy(have_state, dst, i * sizeof(u_int32_t));
3248                 dst += i;
3249         }
3250         /*
3251          * start action section
3252          */
3253         rule->act_ofs = dst - rule->cmd;
3254
3255         /*
3256          * put back O_LOG if necessary
3257          */
3258         src = (ipfw_insn *)cmdbuf;
3259         if ( src->opcode == O_LOG ) {
3260                 i = F_LEN(src);
3261                 bcopy(src, dst, i * sizeof(u_int32_t));
3262                 dst += i;
3263         }
3264         /*
3265          * copy all other actions
3266          */
3267         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3268                 i = F_LEN(src);
3269                 bcopy(src, dst, i * sizeof(u_int32_t));
3270                 dst += i;
3271         }
3272
3273         rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
3274         i = (void *)dst - (void *)rule;
3275         if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
3276                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3277         if (!do_quiet)
3278                 show_ipfw(rule, 10, 10);
3279 }
3280
3281 static void
3282 zero(int ac, char *av[])
3283 {
3284         int rulenum;
3285         int failed = EX_OK;
3286
3287         av++; ac--;
3288
3289         if (!ac) {
3290                 /* clear all entries */
3291                 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
3292                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
3293                 if (!do_quiet)
3294                         printf("Accounting cleared.\n");
3295
3296                 return;
3297         }
3298
3299         while (ac) {
3300                 /* Rule number */
3301                 if (isdigit(**av)) {
3302                         rulenum = atoi(*av);
3303                         av++;
3304                         ac--;
3305                         if (setsockopt(s, IPPROTO_IP,
3306                             IP_FW_ZERO, &rulenum, sizeof rulenum)) {
3307                                 warn("rule %u: setsockopt(IP_FW_ZERO)",
3308                                     rulenum);
3309                                 failed = EX_UNAVAILABLE;
3310                         } else if (!do_quiet)
3311                                 printf("Entry %d cleared\n", rulenum);
3312                 } else {
3313                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3314                 }
3315         }
3316         if (failed != EX_OK)
3317                 exit(failed);
3318 }
3319
3320 static void
3321 resetlog(int ac, char *av[])
3322 {
3323         int rulenum;
3324         int failed = EX_OK;
3325
3326         av++; ac--;
3327
3328         if (!ac) {
3329                 /* clear all entries */
3330                 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
3331                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
3332                 if (!do_quiet)
3333                         printf("Logging counts reset.\n");
3334
3335                 return;
3336         }
3337
3338         while (ac) {
3339                 /* Rule number */
3340                 if (isdigit(**av)) {
3341                         rulenum = atoi(*av);
3342                         av++;
3343                         ac--;
3344                         if (setsockopt(s, IPPROTO_IP,
3345                             IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
3346                                 warn("rule %u: setsockopt(IP_FW_RESETLOG)",
3347                                     rulenum);
3348                                 failed = EX_UNAVAILABLE;
3349                         } else if (!do_quiet)
3350                                 printf("Entry %d logging count reset\n",
3351                                     rulenum);
3352                 } else {
3353                         errx(EX_DATAERR, "invalid rule number ``%s''", *av);
3354                 }
3355         }
3356         if (failed != EX_OK)
3357                 exit(failed);
3358 }
3359
3360 static void
3361 flush()
3362 {
3363         int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3364
3365         if (!do_force && !do_quiet) { /* need to ask user */
3366                 int c;
3367
3368                 printf("Are you sure? [yn] ");
3369                 fflush(stdout);
3370                 do {
3371                         c = toupper(getc(stdin));
3372                         while (c != '\n' && getc(stdin) != '\n')
3373                                 if (feof(stdin))
3374                                         return; /* and do not flush */
3375                 } while (c != 'Y' && c != 'N');
3376                 printf("\n");
3377                 if (c == 'N')   /* user said no */
3378                         return;
3379         }
3380         if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
3381                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3382                     do_pipe ? "DUMMYNET" : "FW");
3383         if (!do_quiet)
3384                 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
3385 }
3386
3387 static int
3388 ipfw_main(int ac, char **av)
3389 {
3390         int ch;
3391
3392         if (ac == 1)
3393                 show_usage();
3394
3395         /* Set the force flag for non-interactive processes */
3396         do_force = !isatty(STDIN_FILENO);
3397
3398         optind = optreset = 1;
3399         while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1)
3400                 switch (ch) {
3401                 case 'h': /* help */
3402                         help();
3403                         break;  /* NOTREACHED */
3404
3405                 case 's': /* sort */
3406                         do_sort = atoi(optarg);
3407                         break;
3408                 case 'a':
3409                         do_acct = 1;
3410                         break;
3411                 case 'c':
3412                         do_compact = 1;
3413                         break;
3414                 case 'd':
3415                         do_dynamic = 1;
3416                         break;
3417                 case 'e':
3418                         do_expired = 1;
3419                         break;
3420                 case 'f':
3421                         do_force = 1;
3422                         break;
3423                 case 'N':
3424                         do_resolv = 1;
3425                         break;
3426                 case 'q':
3427                         do_quiet = 1;
3428                         break;
3429                 case 'S':
3430                         show_sets = 1;
3431                         break;
3432                 case 't':
3433                         do_time = 1;
3434                         break;
3435                 case 'v': /* verbose */
3436                         verbose++;
3437                         break;
3438                 default:
3439                         show_usage();
3440                 }
3441
3442         ac -= optind;
3443         av += optind;
3444         NEED1("bad arguments, for usage summary ``ipfw''");
3445
3446         /*
3447          * optional: pipe or queue
3448          */
3449         if (!strncmp(*av, "pipe", strlen(*av))) {
3450                 do_pipe = 1;
3451                 ac--;
3452                 av++;
3453         } else if (!strncmp(*av, "queue", strlen(*av))) {
3454                 do_pipe = 2;
3455                 ac--;
3456                 av++;
3457         }
3458         NEED1("missing command");
3459
3460         /*
3461          * for pipes and queues we normally say 'pipe NN config'
3462          * but the code is easier to parse as 'pipe config NN'
3463          * so we swap the two arguments.
3464          */
3465         if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
3466                 char *p = av[0];
3467                 av[0] = av[1];
3468                 av[1] = p;
3469         }
3470         if (!strncmp(*av, "add", strlen(*av)))
3471                 add(ac, av);
3472         else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
3473                 config_pipe(ac, av);
3474         else if (!strncmp(*av, "delete", strlen(*av)))
3475                 delete(ac, av);
3476         else if (!strncmp(*av, "flush", strlen(*av)))
3477                 flush();
3478         else if (!strncmp(*av, "zero", strlen(*av)))
3479                 zero(ac, av);
3480         else if (!strncmp(*av, "resetlog", strlen(*av)))
3481                 resetlog(ac, av);
3482         else if (!strncmp(*av, "print", strlen(*av)) ||
3483                  !strncmp(*av, "list", strlen(*av)))
3484                 list(ac, av);
3485         else if (!strncmp(*av, "enable", strlen(*av)))
3486                 sysctl_handler(ac, av, 1);
3487         else if (!strncmp(*av, "disable", strlen(*av)))
3488                 sysctl_handler(ac, av, 0);
3489         else if (!strncmp(*av, "set", strlen(*av)))
3490                 sets_handler(ac, av);
3491         else if (!strncmp(*av, "show", strlen(*av))) {
3492                 do_acct++;
3493                 list(ac, av);
3494         } else
3495                 errx(EX_USAGE, "bad command `%s'", *av);
3496         return 0;
3497 }
3498
3499
3500 static void
3501 ipfw_readfile(int ac, char *av[])
3502 {
3503 #define MAX_ARGS        32
3504 #define WHITESP         " \t\f\v\n\r"
3505         char    buf[BUFSIZ];
3506         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
3507         char    linename[10];
3508         int     i=0, lineno=0, qflag=0, pflag=0, status;
3509         FILE    *f = NULL;
3510         pid_t   preproc = 0;
3511         int     c;
3512
3513         while ((c = getopt(ac, av, "D:U:p:q")) != -1)
3514                 switch(c) {
3515                 case 'D':
3516                         if (!pflag)
3517                                 errx(EX_USAGE, "-D requires -p");
3518                         if (i > MAX_ARGS - 2)
3519                                 errx(EX_USAGE,
3520                                      "too many -D or -U options");
3521                         args[i++] = "-D";
3522                         args[i++] = optarg;
3523                         break;
3524
3525                 case 'U':
3526                         if (!pflag)
3527                                 errx(EX_USAGE, "-U requires -p");
3528                         if (i > MAX_ARGS - 2)
3529                                 errx(EX_USAGE,
3530                                      "too many -D or -U options");
3531                         args[i++] = "-U";
3532                         args[i++] = optarg;
3533                         break;
3534
3535                 case 'p':
3536                         pflag = 1;
3537                         cmd = optarg;
3538                         args[0] = cmd;
3539                         i = 1;
3540                         break;
3541
3542                 case 'q':
3543                         qflag = 1;
3544                         break;
3545
3546                 default:
3547                         errx(EX_USAGE, "bad arguments, for usage"
3548                              " summary ``ipfw''");
3549                 }
3550
3551         av += optind;
3552         ac -= optind;
3553         if (ac != 1)
3554                 errx(EX_USAGE, "extraneous filename arguments");
3555
3556         if ((f = fopen(av[0], "r")) == NULL)
3557                 err(EX_UNAVAILABLE, "fopen: %s", av[0]);
3558
3559         if (pflag) {
3560                 /* pipe through preprocessor (cpp or m4) */
3561                 int pipedes[2];
3562
3563                 args[i] = 0;
3564
3565                 if (pipe(pipedes) == -1)
3566                         err(EX_OSERR, "cannot create pipe");
3567
3568                 switch((preproc = fork())) {
3569                 case -1:
3570                         err(EX_OSERR, "cannot fork");
3571
3572                 case 0:
3573                         /* child */
3574                         if (dup2(fileno(f), 0) == -1
3575                             || dup2(pipedes[1], 1) == -1)
3576                                 err(EX_OSERR, "dup2()");
3577                         fclose(f);
3578                         close(pipedes[1]);
3579                         close(pipedes[0]);
3580                         execvp(cmd, args);
3581                         err(EX_OSERR, "execvp(%s) failed", cmd);
3582
3583                 default:
3584                         /* parent */
3585                         fclose(f);
3586                         close(pipedes[1]);
3587                         if ((f = fdopen(pipedes[0], "r")) == NULL) {
3588                                 int savederrno = errno;
3589
3590                                 kill(preproc, SIGTERM);
3591                                 errno = savederrno;
3592                                 err(EX_OSERR, "fdopen()");
3593                         }
3594                 }
3595         }
3596
3597         while (fgets(buf, BUFSIZ, f)) {
3598                 lineno++;
3599                 sprintf(linename, "Line %d", lineno);
3600                 args[0] = linename;
3601
3602                 if (*buf == '#')
3603                         continue;
3604                 if ((p = strchr(buf, '#')) != NULL)
3605                         *p = '\0';
3606                 i = 1;
3607                 if (qflag)
3608                         args[i++] = "-q";
3609                 for (a = strtok(buf, WHITESP);
3610                     a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
3611                         args[i] = a;
3612                 if (i == (qflag? 2: 1))
3613                         continue;
3614                 if (i == MAX_ARGS)
3615                         errx(EX_USAGE, "%s: too many arguments",
3616                             linename);
3617                 args[i] = NULL;
3618
3619                 ipfw_main(i, args);
3620         }
3621         fclose(f);
3622         if (pflag) {
3623                 if (waitpid(preproc, &status, 0) == -1)
3624                         errx(EX_OSERR, "waitpid()");
3625                 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
3626                         errx(EX_UNAVAILABLE,
3627                             "preprocessor exited with status %d",
3628                             WEXITSTATUS(status));
3629                 else if (WIFSIGNALED(status))
3630                         errx(EX_UNAVAILABLE,
3631                             "preprocessor exited with signal %d",
3632                             WTERMSIG(status));
3633         }
3634 }
3635
3636 int
3637 main(int ac, char *av[])
3638 {
3639         s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
3640         if (s < 0)
3641                 err(EX_UNAVAILABLE, "socket");
3642
3643         /*
3644          * If the last argument is an absolute pathname, interpret it
3645          * as a file to be preprocessed.
3646          */
3647
3648         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
3649                 ipfw_readfile(ac, av);
3650         else
3651                 ipfw_main(ac, av);
3652         return EX_OK;
3653 }