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