sbin/ipfw/ipfw2.c

   1 /*
   2  * Copyright (c) 2002 Luigi Rizzo
   3  * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
   4  * Copyright (c) 1994 Ugen J.S.Antsilevich
   5  *
   6  * Idea and grammar partially left from:
   7  * Copyright (c) 1993 Daniel Boulet
   8  *
   9  * Redistribution and use in source forms, with and without modification,
  10  * are permitted provided that this entire comment appears intact.
  11  *
  12  * Redistribution in binary form may occur without any restrictions.
  13  * Obviously, it would be nice if you gave credit where credit is due
  14  * but requiring it would be too onerous.
  15  *
  16  * This software is provided ``AS IS'' without any warranties of any kind.
  17  *
  18  * NEW command line interface for IP firewall facility
  19  *
  20  * $FreeBSD: src/sbin/ipfw/ipfw2.c,v 1.4.2.13 2003/05/27 22:21:11 gshapiro Exp $
  21  * $DragonFly: src/sbin/ipfw/ipfw2.c,v 1.8 2006/06/25 11:02:37 corecode Exp $
  22  */
  23
  24 #include <sys/param.h>
  25 #include <sys/mbuf.h>
  26 #include <sys/socket.h>
  27 #include <sys/sockio.h>
  28 #include <sys/sysctl.h>
  29 #include <sys/time.h>
  30 #include <sys/wait.h>
  31
  32 #include <ctype.h>
  33 #include <err.h>
  34 #include <errno.h>
  35 #include <grp.h>
  36 #include <limits.h>
  37 #include <netdb.h>
  38 #include <pwd.h>
  39 #include <signal.h>
  40 #include <stdio.h>
  41 #include <stdlib.h>
  42 #include <stdarg.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <sysexits.h>
  46
  47 #include <net/if.h>
  48 #include <netinet/in.h>
  49 #include <netinet/in_systm.h>
  50 #include <netinet/ip.h>
  51 #include <netinet/ip_icmp.h>
  52 #include <net/ipfw/ip_fw.h>
  53 #include <net/route.h> /* def. of struct route */
  54 #include <net/dummynet/ip_dummynet.h>
  55 #include <netinet/tcp.h>
  56 #include <arpa/inet.h>
  57
  58 int             s,                      /* main RAW socket */
  59                 do_resolv,              /* Would try to resolve all */
  60                 do_acct,                /* Show packet/byte count */
  61                 do_time,                /* Show time stamps */
  62                 do_quiet,               /* Be quiet in add and flush */
  63                 do_force,               /* Don't ask for confirmation */
  64                 do_pipe,                /* this cmd refers to a pipe */
  65                 do_sort,                /* field to sort results (0 = no) */
  66                 do_dynamic,             /* display dynamic rules */
  67                 do_expired,             /* display expired dynamic rules */
  68                 do_compact,             /* show rules in compact mode */
  69                 show_sets,              /* display rule sets */
  70                 verbose;
  71
  72 #define IP_MASK_ALL     0xffffffff
  73
  74 /*
  75  * structure to hold flag names and associated values to be
  76  * set in the appropriate masks.
  77  * A NULL string terminates the array.
  78  * Often, an element with 0 value contains an error string.
  79  *
  80  */
  81 struct _s_x {
  82         char *s;
  83         int x;
  84 };
  85
  86 static struct _s_x f_tcpflags[] = {
  87         { "syn", TH_SYN },
  88         { "fin", TH_FIN },
  89         { "ack", TH_ACK },
  90         { "psh", TH_PUSH },
  91         { "rst", TH_RST },
  92         { "urg", TH_URG },
  93         { "tcp flag", 0 },
  94         { NULL, 0 }
  95 };
  96
  97 static struct _s_x f_tcpopts[] = {
  98         { "mss",        IP_FW_TCPOPT_MSS },
  99         { "maxseg",     IP_FW_TCPOPT_MSS },
 100         { "window",     IP_FW_TCPOPT_WINDOW },
 101         { "sack",       IP_FW_TCPOPT_SACK },
 102         { "ts",         IP_FW_TCPOPT_TS },
 103         { "timestamp",  IP_FW_TCPOPT_TS },
 104         { "cc",         IP_FW_TCPOPT_CC },
 105         { "tcp option", 0 },
 106         { NULL, 0 }
 107 };
 108
 109 /*
 110  * IP options span the range 0 to 255 so we need to remap them
 111  * (though in fact only the low 5 bits are significant).
 112  */
 113 static struct _s_x f_ipopts[] = {
 114         { "ssrr",       IP_FW_IPOPT_SSRR},
 115         { "lsrr",       IP_FW_IPOPT_LSRR},
 116         { "rr",         IP_FW_IPOPT_RR},
 117         { "ts",         IP_FW_IPOPT_TS},
 118         { "ip option",  0 },
 119         { NULL, 0 }
 120 };
 121
 122 static struct _s_x f_iptos[] = {
 123         { "lowdelay",   IPTOS_LOWDELAY},
 124         { "throughput", IPTOS_THROUGHPUT},
 125         { "reliability", IPTOS_RELIABILITY},
 126         { "mincost",    IPTOS_MINCOST},
 127         { "congestion", IPTOS_CE},
 128         { "ecntransport", IPTOS_ECT},
 129         { "ip tos option", 0},
 130         { NULL, 0 }
 131 };
 132
 133 static struct _s_x limit_masks[] = {
 134         {"all",         DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
 135         {"src-addr",    DYN_SRC_ADDR},
 136         {"src-port",    DYN_SRC_PORT},
 137         {"dst-addr",    DYN_DST_ADDR},
 138         {"dst-port",    DYN_DST_PORT},
 139         {NULL,          0}
 140 };
 141
 142 /*
 143  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
 144  * This is only used in this code.
 145  */
 146 #define IPPROTO_ETHERTYPE       0x1000
 147 static struct _s_x ether_types[] = {
 148     /*
 149      * Note, we cannot use "-:&/" in the names because they are field
 150      * separators in the type specifications. Also, we use s = NULL as
 151      * end-delimiter, because a type of 0 can be legal.
 152      */
 153         { "ip",         0x0800 },
 154         { "ipv4",       0x0800 },
 155         { "ipv6",       0x86dd },
 156         { "arp",        0x0806 },
 157         { "rarp",       0x8035 },
 158         { "vlan",       0x8100 },
 159         { "loop",       0x9000 },
 160         { "trail",      0x1000 },
 161         { "at",         0x809b },
 162         { "atalk",      0x809b },
 163         { "aarp",       0x80f3 },
 164         { "pppoe_disc", 0x8863 },
 165         { "pppoe_sess", 0x8864 },
 166         { "ipx_8022",   0x00E0 },
 167         { "ipx_8023",   0x0000 },
 168         { "ipx_ii",     0x8137 },
 169         { "ipx_snap",   0x8137 },
 170         { "ipx",        0x8137 },
 171         { "ns",         0x0600 },
 172         { NULL,         0 }
 173 };
 174
 175 static void show_usage(void);
 176
 177 enum tokens {
 178         TOK_NULL=0,
 179
 180         TOK_OR,
 181         TOK_NOT,
 182         TOK_STARTBRACE,
 183         TOK_ENDBRACE,
 184
 185         TOK_ACCEPT,
 186         TOK_COUNT,
 187         TOK_PIPE,
 188         TOK_QUEUE,
 189         TOK_DIVERT,
 190         TOK_TEE,
 191         TOK_FORWARD,
 192         TOK_SKIPTO,
 193         TOK_DENY,
 194         TOK_REJECT,
 195         TOK_RESET,
 196         TOK_UNREACH,
 197         TOK_CHECKSTATE,
 198
 199         TOK_UID,
 200         TOK_GID,
 201         TOK_IN,
 202         TOK_LIMIT,
 203         TOK_KEEPSTATE,
 204         TOK_LAYER2,
 205         TOK_OUT,
 206         TOK_XMIT,
 207         TOK_RECV,
 208         TOK_VIA,
 209         TOK_FRAG,
 210         TOK_IPOPTS,
 211         TOK_IPLEN,
 212         TOK_IPID,
 213         TOK_IPPRECEDENCE,
 214         TOK_IPTOS,
 215         TOK_IPTTL,
 216         TOK_IPVER,
 217         TOK_ESTAB,
 218         TOK_SETUP,
 219         TOK_TCPFLAGS,
 220         TOK_TCPOPTS,
 221         TOK_TCPSEQ,
 222         TOK_TCPACK,
 223         TOK_TCPWIN,
 224         TOK_ICMPTYPES,
 225         TOK_MAC,
 226         TOK_MACTYPE,
 227
 228         TOK_PLR,
 229         TOK_NOERROR,
 230         TOK_BUCKETS,
 231         TOK_DSTIP,
 232         TOK_SRCIP,
 233         TOK_DSTPORT,
 234         TOK_SRCPORT,
 235         TOK_ALL,
 236         TOK_MASK,
 237         TOK_BW,
 238         TOK_DELAY,
 239         TOK_RED,
 240         TOK_GRED,
 241         TOK_DROPTAIL,
 242         TOK_PROTO,
 243         TOK_WEIGHT,
 244 };
 245
 246 struct _s_x dummynet_params[] = {
 247         { "plr",                TOK_PLR },
 248         { "noerror",            TOK_NOERROR },
 249         { "buckets",            TOK_BUCKETS },
 250         { "dst-ip",             TOK_DSTIP },
 251         { "src-ip",             TOK_SRCIP },
 252         { "dst-port",           TOK_DSTPORT },
 253         { "src-port",           TOK_SRCPORT },
 254         { "proto",              TOK_PROTO },
 255         { "weight",             TOK_WEIGHT },
 256         { "all",                TOK_ALL },
 257         { "mask",               TOK_MASK },
 258         { "droptail",           TOK_DROPTAIL },
 259         { "red",                TOK_RED },
 260         { "gred",               TOK_GRED },
 261         { "bw",                 TOK_BW },
 262         { "bandwidth",          TOK_BW },
 263         { "delay",              TOK_DELAY },
 264         { "pipe",               TOK_PIPE },
 265         { "queue",              TOK_QUEUE },
 266         { "dummynet-params",    TOK_NULL },
 267         { NULL, 0 }
 268 };
 269
 270 struct _s_x rule_actions[] = {
 271         { "accept",             TOK_ACCEPT },
 272         { "pass",               TOK_ACCEPT },
 273         { "allow",              TOK_ACCEPT },
 274         { "permit",             TOK_ACCEPT },
 275         { "count",              TOK_COUNT },
 276         { "pipe",               TOK_PIPE },
 277         { "queue",              TOK_QUEUE },
 278         { "divert",             TOK_DIVERT },
 279         { "tee",                TOK_TEE },
 280         { "fwd",                TOK_FORWARD },
 281         { "forward",            TOK_FORWARD },
 282         { "skipto",             TOK_SKIPTO },
 283         { "deny",               TOK_DENY },
 284         { "drop",               TOK_DENY },
 285         { "reject",             TOK_REJECT },
 286         { "reset",              TOK_RESET },
 287         { "unreach",            TOK_UNREACH },
 288         { "check-state",        TOK_CHECKSTATE },
 289         { NULL,                 TOK_NULL },
 290         { NULL, 0 }
 291 };
 292
 293 struct _s_x rule_options[] = {
 294         { "uid",                TOK_UID },
 295         { "gid",                TOK_GID },
 296         { "in",                 TOK_IN },
 297         { "limit",              TOK_LIMIT },
 298         { "keep-state",         TOK_KEEPSTATE },
 299         { "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                                 else
1078                                         s = "?huh?";
1079                                 if (cmdif->name[0] == '\0')
1080                                         printf(" %s %s", s,
1081                                             inet_ntoa(cmdif->p.ip));
1082                                 printf(" %s %s", s, cmdif->name);
1083                                 }
1084                                 break;
1085
1086                         case O_IPID:
1087                                 printf(" ipid %u", cmd->arg1 );
1088                                 break;
1089
1090                         case O_IPTTL:
1091                                 printf(" ipttl %u", cmd->arg1 );
1092                                 break;
1093
1094                         case O_IPVER:
1095                                 printf(" ipver %u", cmd->arg1 );
1096                                 break;
1097
1098                         case O_IPPRECEDENCE:
1099                                 printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1100                                 break;
1101
1102                         case O_IPLEN:
1103                                 printf(" iplen %u", cmd->arg1 );
1104                                 break;
1105
1106                         case O_IPOPT:
1107                                 print_flags("ipoptions", cmd, f_ipopts);
1108                                 break;
1109
1110                         case O_IPTOS:
1111                                 print_flags("iptos", cmd, f_iptos);
1112                                 break;
1113
1114                         case O_ICMPTYPE:
1115                                 print_icmptypes((ipfw_insn_u32 *)cmd);
1116                                 break;
1117
1118                         case O_ESTAB:
1119                                 printf(" established");
1120                                 break;
1121
1122                         case O_TCPFLAGS:
1123                                 print_flags("tcpflags", cmd, f_tcpflags);
1124                                 break;
1125
1126                         case O_TCPOPTS:
1127                                 print_flags("tcpoptions", cmd, f_tcpopts);
1128                                 break;
1129
1130                         case O_TCPWIN:
1131                                 printf(" tcpwin %d", ntohs(cmd->arg1));
1132                                 break;
1133
1134                         case O_TCPACK:
1135                                 printf(" tcpack %ld", ntohl(cmd32->d[0]));
1136                                 break;
1137
1138                         case O_TCPSEQ:
1139                                 printf(" tcpseq %ld", ntohl(cmd32->d[0]));
1140                                 break;
1141
1142                         case O_UID:
1143                             {
1144                                 struct passwd *pwd = getpwuid(cmd32->d[0]);
1145
1146                                 if (pwd)
1147                                         printf(" uid %s", pwd->pw_name);
1148                                 else
1149                                         printf(" uid %u", cmd32->d[0]);
1150                             }
1151                                 break;
1152
1153                         case O_GID:
1154                             {
1155                                 struct group *grp = getgrgid(cmd32->d[0]);
1156
1157                                 if (grp)
1158                                         printf(" gid %s", grp->gr_name);
1159                                 else
1160                                         printf(" gid %u", cmd32->d[0]);
1161                             }
1162                                 break;
1163
1164                         case O_KEEP_STATE:
1165                                 printf(" keep-state");
1166                                 break;
1167
1168                         case O_LIMIT:
1169                             {
1170                                 struct _s_x *p = limit_masks;
1171                                 ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1172                                 u_int8_t x = c->limit_mask;
1173                                 char *comma = " ";
1174
1175                                 printf(" limit");
1176                                 for ( ; p->x != 0 ; p++)
1177                                         if ((x & p->x) == p->x) {
1178                                                 x &= ~p->x;
1179                                                 printf("%s%s", comma, p->s);
1180                                                 comma = ",";
1181                                         }
1182                                 printf(" %d", c->conn_limit);
1183                             }
1184                                 break;
1185
1186                         default:
1187                                 printf(" [opcode %d len %d]",
1188                                     cmd->opcode, cmd->len);
1189                         }
1190                 }
1191                 if (cmd->len & F_OR) {
1192                         printf(" or");
1193                         or_block = 1;
1194                 } else if (or_block) {
1195                         printf(" }");
1196                         or_block = 0;
1197                 }
1198         }
1199         show_prerequisites(&flags, HAVE_IP, 0);
1200
1201         printf("\n");
1202 }
1203
1204 static void
1205 show_dyn_ipfw(ipfw_dyn_rule *d, int pcwidth, int bcwidth)
1206 {
1207         struct protoent *pe;
1208         struct in_addr a;
1209
1210         if (!do_expired) {
1211                 if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1212                         return;
1213         }
1214
1215         printf("%05d %*llu %*llu (%ds)", (int)(d->rule), pcwidth, d->pcnt,
1216             bcwidth, d->bcnt, d->expire);
1217         switch (d->dyn_type) {
1218         case O_LIMIT_PARENT:
1219                 printf(" PARENT %d", d->count);
1220                 break;
1221         case O_LIMIT:
1222                 printf(" LIMIT");
1223                 break;
1224         case O_KEEP_STATE: /* bidir, no mask */
1225                 printf(" STATE");
1226                 break;
1227         }
1228
1229         if ((pe = getprotobynumber(d->id.proto)) != NULL)
1230                 printf(" %s", pe->p_name);
1231         else
1232                 printf(" proto %u", d->id.proto);
1233
1234         a.s_addr = htonl(d->id.src_ip);
1235         printf(" %s %d", inet_ntoa(a), d->id.src_port);
1236
1237         a.s_addr = htonl(d->id.dst_ip);
1238         printf(" <-> %s %d", inet_ntoa(a), d->id.dst_port);
1239         printf("\n");
1240 }
1241
1242 int
1243 sort_q(const void *pa, const void *pb)
1244 {
1245         int rev = (do_sort < 0);
1246         int field = rev ? -do_sort : do_sort;
1247         long long res = 0;
1248         const struct dn_flow_queue *a = pa;
1249         const struct dn_flow_queue *b = pb;
1250
1251         switch (field) {
1252         case 1: /* pkts */
1253                 res = a->len - b->len;
1254                 break;
1255         case 2: /* bytes */
1256                 res = a->len_bytes - b->len_bytes;
1257                 break;
1258
1259         case 3: /* tot pkts */
1260                 res = a->tot_pkts - b->tot_pkts;
1261                 break;
1262
1263         case 4: /* tot bytes */
1264                 res = a->tot_bytes - b->tot_bytes;
1265                 break;
1266         }
1267         if (res < 0)
1268                 res = -1;
1269         if (res > 0)
1270                 res = 1;
1271         return (int)(rev ? res : -res);
1272 }
1273
1274 static void
1275 list_queues(struct dn_flow_set *fs, struct dn_flow_queue *q)
1276 {
1277         int l;
1278
1279         printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1280             fs->flow_mask.proto,
1281             fs->flow_mask.src_ip, fs->flow_mask.src_port,
1282             fs->flow_mask.dst_ip, fs->flow_mask.dst_port);
1283         if (fs->rq_elements == 0)
1284                 return;
1285
1286         printf("BKT Prot ___Source IP/port____ "
1287             "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1288         if (do_sort != 0)
1289                 heapsort(q, fs->rq_elements, sizeof *q, sort_q);
1290         for (l = 0; l < fs->rq_elements; l++) {
1291                 struct in_addr ina;
1292                 struct protoent *pe;
1293
1294                 ina.s_addr = htonl(q[l].id.src_ip);
1295                 printf("%3d ", q[l].hash_slot);
1296                 pe = getprotobynumber(q[l].id.proto);
1297                 if (pe)
1298                         printf("%-4s ", pe->p_name);
1299                 else
1300                         printf("%4u ", q[l].id.proto);
1301                 printf("%15s/%-5d ",
1302                     inet_ntoa(ina), q[l].id.src_port);
1303                 ina.s_addr = htonl(q[l].id.dst_ip);
1304                 printf("%15s/%-5d ",
1305                     inet_ntoa(ina), q[l].id.dst_port);
1306                 printf("%4qu %8qu %2u %4u %3u\n",
1307                     q[l].tot_pkts, q[l].tot_bytes,
1308                     q[l].len, q[l].len_bytes, q[l].drops);
1309                 if (verbose)
1310                         printf("   S %20qd  F %20qd\n",
1311                             q[l].S, q[l].F);
1312         }
1313 }
1314
1315 static void
1316 print_flowset_parms(struct dn_flow_set *fs, char *prefix)
1317 {
1318         int l;
1319         char qs[30];
1320         char plr[30];
1321         char red[90];   /* Display RED parameters */
1322
1323         l = fs->qsize;
1324         if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1325                 if (l >= 8192)
1326                         sprintf(qs, "%d KB", l / 1024);
1327                 else
1328                         sprintf(qs, "%d B", l);
1329         } else
1330                 sprintf(qs, "%3d sl.", l);
1331         if (fs->plr)
1332                 sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1333         else
1334                 plr[0] = '\0';
1335         if (fs->flags_fs & DN_IS_RED)   /* RED parameters */
1336                 sprintf(red,
1337                     "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1338                     (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1339                     1.0 * fs->w_q / (double)(1 << SCALE_RED),
1340                     SCALE_VAL(fs->min_th),
1341                     SCALE_VAL(fs->max_th),
1342                     1.0 * fs->max_p / (double)(1 << SCALE_RED));
1343         else
1344                 sprintf(red, "droptail");
1345
1346         printf("%s %s%s %d queues (%d buckets) %s\n",
1347             prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1348 }
1349
1350 static void
1351 list_pipes(void *data, int nbytes, int ac, char *av[])
1352 {
1353         u_long rulenum;
1354         void *next = data;
1355         struct dn_pipe *p = (struct dn_pipe *) data;
1356         struct dn_flow_set *fs;
1357         struct dn_flow_queue *q;
1358         int l;
1359
1360         if (ac > 0)
1361                 rulenum = strtoul(*av++, NULL, 10);
1362         else
1363                 rulenum = 0;
1364         for (; nbytes >= sizeof *p; p = (struct dn_pipe *)next) {
1365                 double b = p->bandwidth;
1366                 char buf[30];
1367                 char prefix[80];
1368
1369                 if (p->next != (struct dn_pipe *)DN_IS_PIPE)
1370                         break;  /* done with pipes, now queues */
1371
1372                 /*
1373                  * compute length, as pipe have variable size
1374                  */
1375                 l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1376                 next = (void *)p + l;
1377                 nbytes -= l;
1378
1379                 if (rulenum != 0 && rulenum != p->pipe_nr)
1380                         continue;
1381
1382                 /*
1383                  * Print rate (or clocking interface)
1384                  */
1385                 if (p->if_name[0] != '\0')
1386                         sprintf(buf, "%s", p->if_name);
1387                 else if (b == 0)
1388                         sprintf(buf, "unlimited");
1389                 else if (b >= 1000000)
1390                         sprintf(buf, "%7.3f Mbit/s", b/1000000);
1391                 else if (b >= 1000)
1392                         sprintf(buf, "%7.3f Kbit/s", b/1000);
1393                 else
1394                         sprintf(buf, "%7.3f bit/s ", b);
1395
1396                 sprintf(prefix, "%05d: %s %4d ms ",
1397                     p->pipe_nr, buf, p->delay);
1398                 print_flowset_parms(&(p->fs), prefix);
1399                 if (verbose)
1400                         printf("   V %20qd\n", p->V >> MY_M);
1401
1402                 q = (struct dn_flow_queue *)(p+1);
1403                 list_queues(&(p->fs), q);
1404         }
1405         for (fs = next; nbytes >= sizeof *fs; fs = next) {
1406                 char prefix[80];
1407
1408                 if (fs->next != (struct dn_flow_set *)DN_IS_QUEUE)
1409                         break;
1410                 l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1411                 next = (void *)fs + l;
1412                 nbytes -= l;
1413                 q = (struct dn_flow_queue *)(fs+1);
1414                 sprintf(prefix, "q%05d: weight %d pipe %d ",
1415                     fs->fs_nr, fs->weight, fs->parent_nr);
1416                 print_flowset_parms(fs, prefix);
1417                 list_queues(fs, q);
1418         }
1419 }
1420
1421 /*
1422  * This one handles all set-related commands
1423  *      ipfw set { show | enable | disable }
1424  *      ipfw set swap X Y
1425  *      ipfw set move X to Y
1426  *      ipfw set move rule X to Y
1427  */
1428 static void
1429 sets_handler(int ac, char *av[])
1430 {
1431         u_int32_t set_disable, masks[2];
1432         int i, nbytes;
1433         u_int16_t rulenum;
1434         u_int8_t cmd, new_set;
1435
1436         ac--;
1437         av++;
1438
1439         if (!ac)
1440                 errx(EX_USAGE, "set needs command");
1441         if (!strncmp(*av, "show", strlen(*av)) ) {
1442                 void *data;
1443                 char *msg;
1444
1445                 nbytes = sizeof(struct ip_fw);
1446                 if ((data = malloc(nbytes)) == NULL)
1447                         err(EX_OSERR, "malloc");
1448                 if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0)
1449                         err(EX_OSERR, "getsockopt(IP_FW_GET)");
1450                 set_disable = (u_int32_t)(((struct ip_fw *)data)->next_rule);
1451
1452                 for (i = 0, msg = "disable" ; i < 31; i++)
1453                         if (  (set_disable & (1<<i))) {
1454                                 printf("%s %d", msg, i);
1455                                 msg = "";
1456                         }
1457                 msg = (set_disable) ? " enable" : "enable";
1458                 for (i = 0; i < 31; i++)
1459                         if ( !(set_disable & (1<<i))) {
1460                                 printf("%s %d", msg, i);
1461                                 msg = "";
1462                         }
1463                 printf("\n");
1464         } else if (!strncmp(*av, "swap", strlen(*av))) {
1465                 ac--; av++;
1466                 if (ac != 2)
1467                         errx(EX_USAGE, "set swap needs 2 set numbers\n");
1468                 rulenum = atoi(av[0]);
1469                 new_set = atoi(av[1]);
1470                 if (!isdigit(*(av[0])) || rulenum > 30)
1471                         errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1472                 if (!isdigit(*(av[1])) || new_set > 30)
1473                         errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1474                 masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1475                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1476                         masks, sizeof(u_int32_t));
1477         } else if (!strncmp(*av, "move", strlen(*av))) {
1478                 ac--; av++;
1479                 if (ac && !strncmp(*av, "rule", strlen(*av))) {
1480                         cmd = 2;
1481                         ac--; av++;
1482                 } else
1483                         cmd = 3;
1484                 if (ac != 3 || strncmp(av[1], "to", strlen(*av)))
1485                         errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1486                 rulenum = atoi(av[0]);
1487                 new_set = atoi(av[2]);
1488                 if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) ||
1489                         (cmd == 2 && rulenum == 65535) )
1490                         errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1491                 if (!isdigit(*(av[2])) || new_set > 30)
1492                         errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1493                 masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1494                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1495                         masks, sizeof(u_int32_t));
1496         } else if (!strncmp(*av, "disable", strlen(*av)) ||
1497                    !strncmp(*av, "enable",  strlen(*av)) ) {
1498                 int which = !strncmp(*av, "enable",  strlen(*av)) ? 1 : 0;
1499
1500                 ac--; av++;
1501                 masks[0] = masks[1] = 0;
1502
1503                 while (ac) {
1504                         if (isdigit(**av)) {
1505                                 i = atoi(*av);
1506                                 if (i < 0 || i > 30)
1507                                         errx(EX_DATAERR,
1508                                             "invalid set number %d\n", i);
1509                                 masks[which] |= (1<<i);
1510                         } else if (!strncmp(*av, "disable", strlen(*av)))
1511                                 which = 0;
1512                         else if (!strncmp(*av, "enable", strlen(*av)))
1513                                 which = 1;
1514                         else
1515                                 errx(EX_DATAERR,
1516                                         "invalid set command %s\n", *av);
1517                         av++; ac--;
1518                 }
1519                 if ( (masks[0] & masks[1]) != 0 )
1520                         errx(EX_DATAERR,
1521                             "cannot enable and disable the same set\n");
1522
1523                 i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks));
1524                 if (i)
1525                         warn("set enable/disable: setsockopt(IP_FW_DEL)");
1526         } else
1527                 errx(EX_USAGE, "invalid set command %s\n", *av);
1528 }
1529
1530 static void
1531 sysctl_handler(int ac, char *av[], int which)
1532 {
1533         ac--;
1534         av++;
1535
1536         if (*av == NULL) {
1537                 warnx("missing keyword to enable/disable\n");
1538         } else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
1539                 sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1540                     &which, sizeof(which));
1541         } else if (strncmp(*av, "one_pass", strlen(*av)) == 0) {
1542                 sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1543                     &which, sizeof(which));
1544         } else if (strncmp(*av, "debug", strlen(*av)) == 0) {
1545                 sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1546                     &which, sizeof(which));
1547         } else if (strncmp(*av, "verbose", strlen(*av)) == 0) {
1548                 sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1549                     &which, sizeof(which));
1550         } else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) {
1551                 sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1552                     &which, sizeof(which));
1553         } else {
1554                 warnx("unrecognize enable/disable keyword: %s\n", *av);
1555         }
1556 }
1557
1558 static void
1559 list(int ac, char *av[])
1560 {
1561         struct ip_fw *r;
1562         ipfw_dyn_rule *dynrules, *d;
1563
1564         void *lim, *data = NULL;
1565         int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1566         int exitval = EX_OK;
1567         int lac;
1568         char **lav;
1569         u_long rnum;
1570         char *endptr;
1571         int seen = 0;
1572
1573         const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1574         int nalloc = 1024;      /* start somewhere... */
1575
1576         ac--;
1577         av++;
1578
1579         /* get rules or pipes from kernel, resizing array as necessary */
1580         nbytes = nalloc;
1581
1582         while (nbytes >= nalloc) {
1583                 nalloc = nalloc * 2 + 200;
1584                 nbytes = nalloc;
1585                 if ((data = realloc(data, nbytes)) == NULL)
1586                         err(EX_OSERR, "realloc");
1587                 if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1588                         err(EX_OSERR, "getsockopt(IP_%s_GET)",
1589                                 do_pipe ? "DUMMYNET" : "FW");
1590         }
1591
1592         if (do_pipe) {
1593                 list_pipes(data, nbytes, ac, av);
1594                 goto done;
1595         }
1596
1597         /*
1598          * Count static rules. They have variable size so we
1599          * need to scan the list to count them.
1600          */
1601         for (nstat = 1, r = data, lim = data + nbytes;
1602                     r->rulenum < 65535 && (void *)r < lim;
1603                     ++nstat, r = (void *)r + RULESIZE(r) )
1604                 ; /* nothing */
1605
1606         /*
1607          * Count dynamic rules. This is easier as they have
1608          * fixed size.
1609          */
1610         r = (void *)r + RULESIZE(r);
1611         dynrules = (ipfw_dyn_rule *)r ;
1612         n = (void *)r - data;
1613         ndyn = (nbytes - n) / sizeof *dynrules;
1614
1615         /* if showing stats, figure out column widths ahead of time */
1616         bcwidth = pcwidth = 0;
1617         if (do_acct) {
1618                 for (n = 0, r = data; n < nstat;
1619                     n++, r = (void *)r + RULESIZE(r)) {
1620                         /* packet counter */
1621                         width = snprintf(NULL, 0, "%llu", r->pcnt);
1622                         if (width > pcwidth)
1623                                 pcwidth = width;
1624
1625                         /* byte counter */
1626                         width = snprintf(NULL, 0, "%llu", r->bcnt);
1627                         if (width > bcwidth)
1628                                 bcwidth = width;
1629                 }
1630         }
1631         if (do_dynamic && ndyn) {
1632                 for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1633                         width = snprintf(NULL, 0, "%llu", d->pcnt);
1634                         if (width > pcwidth)
1635                                 pcwidth = width;
1636
1637                         width = snprintf(NULL, 0, "%llu", d->bcnt);
1638                         if (width > bcwidth)
1639                                 bcwidth = width;
1640                 }
1641         }
1642         /* if no rule numbers were specified, list all rules */
1643         if (ac == 0) {
1644                 for (n = 0, r = data; n < nstat;
1645                     n++, r = (void *)r + RULESIZE(r) )
1646                         show_ipfw(r, pcwidth, bcwidth);
1647
1648                 if (do_dynamic && ndyn) {
1649                         printf("## Dynamic rules (%d):\n", ndyn);
1650                         for (n = 0, d = dynrules; n < ndyn; n++, d++)
1651                                 show_dyn_ipfw(d, pcwidth, bcwidth);
1652                 }
1653                 goto done;
1654         }
1655
1656         /* display specific rules requested on command line */
1657
1658         for (lac = ac, lav = av; lac != 0; lac--) {
1659                 /* convert command line rule # */
1660                 rnum = strtoul(*lav++, &endptr, 10);
1661                 if (*endptr) {
1662                         exitval = EX_USAGE;
1663                         warnx("invalid rule number: %s", *(lav - 1));
1664                         continue;
1665                 }
1666                 for (n = seen = 0, r = data; n < nstat;
1667                     n++, r = (void *)r + RULESIZE(r) ) {
1668                         if (r->rulenum > rnum)
1669                                 break;
1670                         if (r->rulenum == rnum) {
1671                                 show_ipfw(r, pcwidth, bcwidth);
1672                                 seen = 1;
1673                         }
1674                 }
1675                 if (!seen) {
1676                         /* give precedence to other error(s) */
1677                         if (exitval == EX_OK)
1678                                 exitval = EX_UNAVAILABLE;
1679                         warnx("rule %lu does not exist", rnum);
1680                 }
1681         }
1682
1683         if (do_dynamic && ndyn) {
1684                 printf("## Dynamic rules:\n");
1685                 for (lac = ac, lav = av; lac != 0; lac--) {
1686                         rnum = strtoul(*lav++, &endptr, 10);
1687                         if (*endptr)
1688                                 /* already warned */
1689                                 continue;
1690                         for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1691                                 if ((int)(d->rule) > rnum)
1692                                         break;
1693                                 if ((int)(d->rule) == rnum)
1694                                         show_dyn_ipfw(d, pcwidth, bcwidth);
1695                         }
1696                 }
1697         }
1698
1699         ac = 0;
1700
1701 done:
1702         free(data);
1703
1704         if (exitval != EX_OK)
1705                 exit(exitval);
1706 }
1707
1708 static void
1709 show_usage(void)
1710 {
1711         fprintf(stderr, "usage: ipfw [options]\n"
1712 "    add [number] rule\n"
1713 "    pipe number config [pipeconfig]\n"
1714 "    queue number config [queueconfig]\n"
1715 "    [pipe] flush\n"
1716 "    [pipe] delete number ...\n"
1717 "    [pipe] {list|show} [number ...]\n"
1718 "    {zero|resetlog} [number ...]\n"
1719 "do \"ipfw -h\" or see ipfw manpage for details\n"
1720 );
1721
1722         exit(EX_USAGE);
1723 }
1724
1725 static void
1726 help(void)
1727 {
1728
1729         fprintf(stderr, "ipfw syntax summary:\n"
1730 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1731 "ipfw {pipe|queue} N config BODY\n"
1732 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1733 "\n"
1734 "RULE:          [1..] [PROB] BODY\n"
1735 "RULENUM:       INTEGER(1..65534)\n"
1736 "PROB:          prob REAL(0..1)\n"
1737 "BODY:          check-state [LOG] (no body) |\n"
1738 "               ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1739 "ACTION:        check-state | allow | count | deny | reject | skipto N |\n"
1740 "               {divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1741 "ADDR:          [ MAC dst src ether_type ] \n"
1742 "               [ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1743 "IPLIST:        IPADDR | ( IPADDR or ... or IPADDR )\n"
1744 "IPADDR:        [not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1745 "OPTION_LIST:   OPTION [,OPTION_LIST]\n"
1746 );
1747 exit(0);
1748 }
1749
1750
1751 static int
1752 lookup_host (char *host, struct in_addr *ipaddr)
1753 {
1754         struct hostent *he;
1755
1756         if (!inet_aton(host, ipaddr)) {
1757                 if ((he = gethostbyname(host)) == NULL)
1758                         return(-1);
1759                 *ipaddr = *(struct in_addr *)he->h_addr_list[0];
1760         }
1761         return(0);
1762 }
1763
1764 /*
1765  * fills the addr and mask fields in the instruction as appropriate from av.
1766  * Update length as appropriate.
1767  * The following formats are allowed:
1768  *      any     matches any IP. Actually returns an empty instruction.
1769  *      me      returns O_IP_*_ME
1770  *      1.2.3.4         single IP address
1771  *      1.2.3.4:5.6.7.8 address:mask
1772  *      1.2.3.4/24      address/mask
1773  *      1.2.3.4/26{1,6,5,4,23}  set of addresses in a subnet
1774  */
1775 static void
1776 fill_ip(ipfw_insn_ip *cmd, char *av)
1777 {
1778         char *p = 0, md = 0;
1779         u_int32_t i;
1780
1781         cmd->o.len &= ~F_LEN_MASK;      /* zero len */
1782
1783         if (!strncmp(av, "any", strlen(av)))
1784                 return;
1785
1786         if (!strncmp(av, "me", strlen(av))) {
1787                 cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1788                 return;
1789         }
1790
1791         p = strchr(av, '/');
1792         if (!p)
1793                 p = strchr(av, ':');
1794         if (p) {
1795                 md = *p;
1796                 *p++ = '\0';
1797         }
1798
1799         if (lookup_host(av, &cmd->addr) != 0)
1800                 errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1801         switch (md) {
1802         case ':':
1803                 if (!inet_aton(p, &cmd->mask))
1804                         errx(EX_DATAERR, "bad netmask ``%s''", p);
1805                 break;
1806         case '/':
1807                 i = atoi(p);
1808                 if (i == 0)
1809                         cmd->mask.s_addr = htonl(0);
1810                 else if (i > 32)
1811                         errx(EX_DATAERR, "bad width ``%s''", p);
1812                 else
1813                         cmd->mask.s_addr = htonl(~0 << (32 - i));
1814                 break;
1815         default:
1816                 cmd->mask.s_addr = htonl(~0);
1817                 break;
1818         }
1819         cmd->addr.s_addr &= cmd->mask.s_addr;
1820         /*
1821          * now look if we have a set of addresses. They are stored as follows:
1822          *   arg1       is the set size (powers of 2, 2..256)
1823          *   addr       is the base address IN HOST FORMAT
1824          *   mask..     is an array of u_int32_t with bits set.
1825          */
1826         if (p)
1827                 p = strchr(p, '{');
1828         if (p) {        /* fetch addresses */
1829                 u_int32_t *d;
1830                 int low, high;
1831                 int i = contigmask((u_char *)&(cmd->mask), 32);
1832
1833                 if (i < 24 || i > 31) {
1834                         fprintf(stderr, "invalid set with mask %d\n",
1835                                 i);
1836                         exit(0);
1837                 }
1838                 cmd->o.arg1 = 1<<(32-i);
1839                 cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1840                 d = (u_int32_t *)&cmd->mask;
1841                 cmd->o.opcode = O_IP_DST_SET;   /* default */
1842                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1843                 for (i = 0; i < (cmd->o.arg1+31)/32 ; i++)
1844                         d[i] = 0;       /* clear masks */
1845
1846                 av = p+1;
1847                 low = cmd->addr.s_addr & 0xff;
1848                 high = low + cmd->o.arg1 - 1;
1849                 while (isdigit(*av)) {
1850                         char *s;
1851                         u_int16_t a = strtol(av, &s, 0);
1852
1853                         if (s == av) /* no parameter */
1854                                 break;
1855                         if (a < low || a > high) {
1856                             fprintf(stderr, "addr %d out of range [%d-%d]\n",
1857                                 a, low, high);
1858                             exit(0);
1859                         }
1860                         a -= low;
1861                         d[ a/32] |= 1<<(a & 31);
1862                         if (*s != ',')
1863                                 break;
1864                         av = s+1;
1865                 }
1866                 return;
1867         }
1868
1869         if (cmd->mask.s_addr == 0) { /* any */
1870                 if (cmd->o.len & F_NOT)
1871                         errx(EX_DATAERR, "not any never matches");
1872                 else    /* useless, nuke it */
1873                         return;
1874         } else if (cmd->mask.s_addr ==  IP_MASK_ALL)    /* one IP */
1875                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1876         else                                            /* addr/mask */
1877                 cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1878 }
1879
1880
1881 /*
1882  * helper function to process a set of flags and set bits in the
1883  * appropriate masks.
1884  */
1885 static void
1886 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
1887         struct _s_x *flags, char *p)
1888 {
1889         u_int8_t set=0, clear=0;
1890
1891         while (p && *p) {
1892                 char *q;        /* points to the separator */
1893                 int val;
1894                 u_int8_t *which;        /* mask we are working on */
1895
1896                 if (*p == '!') {
1897                         p++;
1898                         which = &clear;
1899                 } else
1900                         which = &set;
1901                 q = strchr(p, ',');
1902                 if (q)
1903                         *q++ = '\0';
1904                 val = match_token(flags, p);
1905                 if (val <= 0)
1906                         errx(EX_DATAERR, "invalid flag %s", p);
1907                 *which |= (u_int8_t)val;
1908                 p = q;
1909         }
1910         cmd->opcode = opcode;
1911         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
1912         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
1913 }
1914
1915
1916 static void
1917 delete(int ac, char *av[])
1918 {
1919         u_int32_t rulenum;
1920         struct dn_pipe pipe;
1921         int i;
1922         int exitval = EX_OK;
1923         int do_set = 0;
1924
1925         memset(&pipe, 0, sizeof pipe);
1926
1927         av++; ac--;
1928         if (ac > 0 && !strncmp(*av, "set", strlen(*av))) {
1929                 do_set = 1;     /* delete set */
1930                 ac--; av++;
1931         }
1932
1933         /* Rule number */
1934         while (ac && isdigit(**av)) {
1935                 i = atoi(*av); av++; ac--;
1936                 if (do_pipe) {
1937                         if (do_pipe == 1)
1938                                 pipe.pipe_nr = i;
1939                         else
1940                                 pipe.fs.fs_nr = i;
1941                         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
1942                             &pipe, sizeof pipe);
1943                         if (i) {
1944                                 exitval = 1;
1945                                 warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
1946                                     do_pipe == 1 ? pipe.pipe_nr :
1947                                     pipe.fs.fs_nr);
1948                         }
1949                 } else {
1950                         rulenum =  (i & 0xffff) | (do_set << 24);
1951                         i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
1952                             sizeof rulenum);
1953                         if (i) {
1954                                 exitval = EX_UNAVAILABLE;
1955                                 warn("rule %u: setsockopt(IP_FW_DEL)",
1956                                     rulenum);
1957                         }
1958                 }
1959         }
1960         if (exitval != EX_OK)
1961                 exit(exitval);
1962 }
1963
1964
1965 /*
1966  * fill the interface structure. We do not check the name as we can
1967  * create interfaces dynamically, so checking them at insert time
1968  * makes relatively little sense.
1969  * Interface names containing '*', '?', or '[' are assumed to be shell
1970  * patterns which match interfaces.
1971  */
1972 static void
1973 fill_iface(ipfw_insn_if *cmd, char *arg)
1974 {
1975         cmd->name[0] = '\0';
1976         cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
1977
1978         /* Parse the interface or address */
1979         if (!strcmp(arg, "any"))
1980                 cmd->o.len = 0;         /* effectively ignore this command */
1981         else if (!isdigit(*arg)) {
1982                 strlcpy(cmd->name, arg, sizeof(cmd->name));
1983                 cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
1984         } else if (!inet_aton(arg, &cmd->p.ip))
1985                 errx(EX_DATAERR, "bad ip address ``%s''", arg);
1986 }
1987
1988 static unsigned long
1989 getbw(const char *str, u_short *flags, int kb)
1990 {
1991     char *end;
1992     unsigned long val;
1993     int inbytes = 0;
1994
1995     val = strtoul(str, &end, 0);
1996     if (*end == 'k' || *end == 'K') {
1997         ++end;
1998         val *= kb;
1999     } else if (*end == 'm' || *end == 'M') {
2000         ++end;
2001         val *= kb * kb;
2002     }
2003
2004     /*
2005      * Deal with bits or bytes or b(bits) or B(bytes).  If there is no
2006      * trailer assume bits.
2007      */
2008     if (strncasecmp(end, "bit", 3) == 0) {
2009         ;
2010     } else if (strncasecmp(end, "byte", 4) == 0) {
2011         inbytes = 1;
2012     } else if (*end == 'b') {
2013         ;
2014     } else if (*end == 'B') {
2015         inbytes = 1;
2016     }
2017
2018     /*
2019      * Return in bits if flags is NULL, else flag bits
2020      * or bytes in flags and return the unconverted value.
2021      */
2022     if (inbytes && flags)
2023         *flags |= DN_QSIZE_IS_BYTES;
2024     else if (inbytes && flags == NULL)
2025         val *= 8;
2026     return(val);
2027 }
2028
2029 /*
2030  * the following macro returns an error message if we run out of
2031  * arguments.
2032  */
2033 #define NEED1(msg)      {if (!ac) errx(EX_USAGE, msg);}
2034
2035 static void
2036 config_pipe(int ac, char **av)
2037 {
2038         struct dn_pipe pipe;
2039         int i;
2040         char *end;
2041         u_int32_t a;
2042         void *par = NULL;
2043
2044         memset(&pipe, 0, sizeof pipe);
2045
2046         av++; ac--;
2047         /* Pipe number */
2048         if (ac && isdigit(**av)) {
2049                 i = atoi(*av); av++; ac--;
2050                 if (do_pipe == 1)
2051                         pipe.pipe_nr = i;
2052                 else
2053                         pipe.fs.fs_nr = i;
2054         }
2055         while (ac > 0) {
2056                 double d;
2057                 int tok = match_token(dummynet_params, *av);
2058                 ac--; av++;
2059
2060                 switch(tok) {
2061                 case TOK_NOERROR:
2062                         pipe.fs.flags_fs |= DN_NOERROR;
2063                         break;
2064
2065                 case TOK_PLR:
2066                         NEED1("plr needs argument 0..1\n");
2067                         d = strtod(av[0], NULL);
2068                         if (d > 1)
2069                                 d = 1;
2070                         else if (d < 0)
2071                                 d = 0;
2072                         pipe.fs.plr = (int)(d*0x7fffffff);
2073                         ac--; av++;
2074                         break;
2075
2076                 case TOK_QUEUE:
2077                         NEED1("queue needs queue size\n");
2078                         end = NULL;
2079                         pipe.fs.qsize = getbw(av[0], &pipe.fs.flags_fs, 1024);
2080                         ac--; av++;
2081                         break;
2082
2083                 case TOK_BUCKETS:
2084                         NEED1("buckets needs argument\n");
2085                         pipe.fs.rq_size = strtoul(av[0], NULL, 0);
2086                         ac--; av++;
2087                         break;
2088
2089                 case TOK_MASK:
2090                         NEED1("mask needs mask specifier\n");
2091                         /*
2092                          * per-flow queue, mask is dst_ip, dst_port,
2093                          * src_ip, src_port, proto measured in bits
2094                          */
2095                         par = NULL;
2096
2097                         pipe.fs.flow_mask.dst_ip = 0;
2098                         pipe.fs.flow_mask.src_ip = 0;
2099                         pipe.fs.flow_mask.dst_port = 0;
2100                         pipe.fs.flow_mask.src_port = 0;
2101                         pipe.fs.flow_mask.proto = 0;
2102                         end = NULL;
2103
2104                         while (ac >= 1) {
2105                             u_int32_t *p32 = NULL;
2106                             u_int16_t *p16 = NULL;
2107
2108                             tok = match_token(dummynet_params, *av);
2109                             ac--; av++;
2110                             switch(tok) {
2111                             case TOK_ALL:
2112                                     /*
2113                                      * special case, all bits significant
2114                                      */
2115                                     pipe.fs.flow_mask.dst_ip = ~0;
2116                                     pipe.fs.flow_mask.src_ip = ~0;
2117                                     pipe.fs.flow_mask.dst_port = ~0;
2118                                     pipe.fs.flow_mask.src_port = ~0;
2119                                     pipe.fs.flow_mask.proto = ~0;
2120                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2121                                     goto end_mask;
2122
2123                             case TOK_DSTIP:
2124                                     p32 = &pipe.fs.flow_mask.dst_ip;
2125                                     break;
2126
2127                             case TOK_SRCIP:
2128                                     p32 = &pipe.fs.flow_mask.src_ip;
2129                                     break;
2130
2131                             case TOK_DSTPORT:
2132                                     p16 = &pipe.fs.flow_mask.dst_port;
2133                                     break;
2134
2135                             case TOK_SRCPORT:
2136                                     p16 = &pipe.fs.flow_mask.src_port;
2137                                     break;
2138
2139                             case TOK_PROTO:
2140                                     break;
2141
2142                             default:
2143                                     ac++; av--; /* backtrack */
2144                                     goto end_mask;
2145                             }
2146                             if (ac < 1)
2147                                     errx(EX_USAGE, "mask: value missing");
2148                             if (*av[0] == '/') {
2149                                     a = strtoul(av[0]+1, &end, 0);
2150                                     a = (a == 32) ? ~0 : (1 << a) - 1;
2151                             } else
2152                                     a = strtoul(av[0], &end, 0);
2153                             if (p32 != NULL)
2154                                     *p32 = a;
2155                             else if (p16 != NULL) {
2156                                     if (a > 65535)
2157                                             errx(EX_DATAERR,
2158                                                 "mask: must be 16 bit");
2159                                     *p16 = (u_int16_t)a;
2160                             } else {
2161                                     if (a > 255)
2162                                             errx(EX_DATAERR,
2163                                                 "mask: must be 8 bit");
2164                                     pipe.fs.flow_mask.proto = (u_int8_t)a;
2165                             }
2166                             if (a != 0)
2167                                     pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2168                             ac--; av++;
2169                         } /* end while, config masks */
2170 end_mask:
2171                         break;
2172
2173                 case TOK_RED:
2174                 case TOK_GRED:
2175                         NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
2176                         pipe.fs.flags_fs |= DN_IS_RED;
2177                         if (tok == TOK_GRED)
2178                                 pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
2179                         /*
2180                          * the format for parameters is w_q/min_th/max_th/max_p
2181                          */
2182                         if ((end = strsep(&av[0], "/"))) {
2183                             double w_q = strtod(end, NULL);
2184                             if (w_q > 1 || w_q <= 0)
2185                                 errx(EX_DATAERR, "0 < w_q <= 1");
2186                             pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
2187                         }
2188                         if ((end = strsep(&av[0], "/"))) {
2189                             pipe.fs.min_th = strtoul(end, &end, 0);
2190                             if (*end == 'K' || *end == 'k')
2191                                 pipe.fs.min_th *= 1024;
2192                         }
2193                         if ((end = strsep(&av[0], "/"))) {
2194                             pipe.fs.max_th = strtoul(end, &end, 0);
2195                             if (*end == 'K' || *end == 'k')
2196                                 pipe.fs.max_th *= 1024;
2197                         }
2198                         if ((end = strsep(&av[0], "/"))) {
2199                             double max_p = strtod(end, NULL);
2200                             if (max_p > 1 || max_p <= 0)
2201                                 errx(EX_DATAERR, "0 < max_p <= 1");
2202                             pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
2203                         }
2204                         ac--; av++;
2205                         break;
2206
2207                 case TOK_DROPTAIL:
2208                         pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
2209                         break;
2210
2211                 case TOK_BW:
2212                         NEED1("bw needs bandwidth or interface\n");
2213                         if (do_pipe != 1)
2214                             errx(EX_DATAERR, "bandwidth only valid for pipes");
2215                         /*
2216                          * set clocking interface or bandwidth value
2217                          */
2218                         if (av[0][0] >= 'a' && av[0][0] <= 'z') {
2219                             int l = sizeof(pipe.if_name)-1;
2220                             /* interface name */
2221                             strncpy(pipe.if_name, av[0], l);
2222                             pipe.if_name[l] = '\0';
2223                             pipe.bandwidth = 0;
2224                         } else {
2225                             pipe.if_name[0] = '\0';
2226                             pipe.bandwidth = strtoul(av[0], &end, 0);
2227                             pipe.bandwidth = getbw(av[0], NULL, 1000);
2228                             if (pipe.bandwidth < 0)
2229                                 errx(EX_DATAERR, "bandwidth too large");
2230                         }
2231                         ac--; av++;
2232                         break;
2233
2234                 case TOK_DELAY:
2235                         if (do_pipe != 1)
2236                                 errx(EX_DATAERR, "delay only valid for pipes");
2237                         NEED1("delay needs argument 0..10000ms\n");
2238                         pipe.delay = strtoul(av[0], NULL, 0);
2239                         ac--; av++;
2240                         break;
2241
2242                 case TOK_WEIGHT:
2243                         if (do_pipe == 1)
2244                                 errx(EX_DATAERR,"weight only valid for queues");
2245                         NEED1("weight needs argument 0..100\n");
2246                         pipe.fs.weight = strtoul(av[0], &end, 0);
2247                         ac--; av++;
2248                         break;
2249
2250                 case TOK_PIPE:
2251                         if (do_pipe == 1)
2252                                 errx(EX_DATAERR,"pipe only valid for queues");
2253                         NEED1("pipe needs pipe_number\n");
2254                         pipe.fs.parent_nr = strtoul(av[0], &end, 0);
2255                         ac--; av++;
2256                         break;
2257
2258                 default:
2259                         errx(EX_DATAERR, "unrecognised option ``%s''", *av);
2260                 }
2261         }
2262         if (do_pipe == 1) {
2263                 if (pipe.pipe_nr == 0)
2264                         errx(EX_DATAERR, "pipe_nr must be > 0");
2265                 if (pipe.delay > 10000)
2266                         errx(EX_DATAERR, "delay must be < 10000");
2267         } else { /* do_pipe == 2, queue */
2268                 if (pipe.fs.parent_nr == 0)
2269                         errx(EX_DATAERR, "pipe must be > 0");
2270                 if (pipe.fs.weight >100)
2271                         errx(EX_DATAERR, "weight must be <= 100");
2272         }
2273         if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
2274                 if (pipe.fs.qsize > 1024*1024)
2275                         errx(EX_DATAERR, "queue size must be < 1MB");
2276         } else {
2277                 if (pipe.fs.qsize > 100)
2278                         errx(EX_DATAERR, "2 <= queue size <= 100");
2279         }
2280         if (pipe.fs.flags_fs & DN_IS_RED) {
2281                 size_t len;
2282                 int lookup_depth, avg_pkt_size;
2283                 double s, idle, weight, w_q;
2284                 struct clockinfo clock;
2285                 int t;
2286
2287                 if (pipe.fs.min_th >= pipe.fs.max_th)
2288                     errx(EX_DATAERR, "min_th %d must be < than max_th %d",
2289                         pipe.fs.min_th, pipe.fs.max_th);
2290                 if (pipe.fs.max_th == 0)
2291                     errx(EX_DATAERR, "max_th must be > 0");
2292
2293                 len = sizeof(int);
2294                 if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
2295                         &lookup_depth, &len, NULL, 0) == -1)
2296
2297                     errx(1, "sysctlbyname(\"%s\")",
2298                         "net.inet.ip.dummynet.red_lookup_depth");
2299                 if (lookup_depth == 0)
2300                     errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2301                         " must be greater than zero");
2302
2303                 len = sizeof(int);
2304                 if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2305                         &avg_pkt_size, &len, NULL, 0) == -1)
2306
2307                     errx(1, "sysctlbyname(\"%s\")",
2308                         "net.inet.ip.dummynet.red_avg_pkt_size");
2309                 if (avg_pkt_size == 0)
2310                         errx(EX_DATAERR,
2311                             "net.inet.ip.dummynet.red_avg_pkt_size must"
2312                             " be greater than zero");
2313
2314                 len = sizeof(struct clockinfo);
2315                 if (sysctlbyname("kern.clockrate", &clock, &len, NULL, 0) == -1)
2316                         errx(1, "sysctlbyname(\"%s\")", "kern.clockrate");
2317
2318                 /*
2319                  * Ticks needed for sending a medium-sized packet.
2320                  * Unfortunately, when we are configuring a WF2Q+ queue, we
2321                  * do not have bandwidth information, because that is stored
2322                  * in the parent pipe, and also we have multiple queues
2323                  * competing for it. So we set s=0, which is not very
2324                  * correct. But on the other hand, why do we want RED with
2325                  * WF2Q+ ?
2326                  */
2327                 if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2328                         s = 0;
2329                 else
2330                         s = clock.hz * avg_pkt_size * 8 / pipe.bandwidth;
2331
2332                 /*
2333                  * max idle time (in ticks) before avg queue size becomes 0.
2334                  * NOTA:  (3/w_q) is approx the value x so that
2335                  * (1-w_q)^x < 10^-3.
2336                  */
2337                 w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2338                 idle = s * 3. / w_q;
2339                 pipe.fs.lookup_step = (int)idle / lookup_depth;
2340                 if (!pipe.fs.lookup_step)
2341                         pipe.fs.lookup_step = 1;
2342                 weight = 1 - w_q;
2343                 for (t = pipe.fs.lookup_step; t > 0; --t)
2344                         weight *= weight;
2345                 pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2346         }
2347         i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2348                             sizeof pipe);
2349         if (i)
2350                 err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2351 }
2352
2353 static void
2354 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2355 {
2356         int i, l;
2357
2358         for (i=0; i<6; i++)
2359                 addr[i] = mask[i] = 0;
2360         if (!strcmp(p, "any"))
2361                 return;
2362
2363         for (i=0; *p && i<6;i++, p++) {
2364                 addr[i] = strtol(p, &p, 16);
2365                 if (*p != ':') /* we start with the mask */
2366                         break;
2367         }
2368         if (*p == '/') { /* mask len */
2369                 l = strtol(p+1, &p, 0);
2370                 for (i=0; l>0; l -=8, i++)
2371                         mask[i] = (l >=8) ? 0xff : (~0) << (8-l);
2372         } else if (*p == '&') { /* mask */
2373                 for (i=0, p++; *p && i<6;i++, p++) {
2374                         mask[i] = strtol(p, &p, 16);
2375                         if (*p != ':')
2376                                 break;
2377                 }
2378         } else if (*p == '\0') {
2379                 for (i=0; i<6; i++)
2380                         mask[i] = 0xff;
2381         }
2382         for (i=0; i<6; i++)
2383                 addr[i] &= mask[i];
2384 }
2385
2386 /*
2387  * helper function, updates the pointer to cmd with the length
2388  * of the current command, and also cleans up the first word of
2389  * the new command in case it has been clobbered before.
2390  */
2391 static ipfw_insn *
2392 next_cmd(ipfw_insn *cmd)
2393 {
2394         cmd += F_LEN(cmd);
2395         bzero(cmd, sizeof(*cmd));
2396         return cmd;
2397 }
2398
2399 /*
2400  * A function to fill simple commands of size 1.
2401  * Existing flags are preserved.
2402  */
2403 static void
2404 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2405 {
2406         cmd->opcode = opcode;
2407         cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2408         cmd->arg1 = arg;
2409 }
2410
2411 /*
2412  * Fetch and add the MAC address and type, with masks. This generates one or
2413  * two microinstructions, and returns the pointer to the last one.
2414  */
2415 static ipfw_insn *
2416 add_mac(ipfw_insn *cmd, int ac, char *av[])
2417 {
2418         ipfw_insn_mac *mac;
2419
2420         if (ac < 2)
2421                 errx(EX_DATAERR, "MAC dst src");
2422
2423         cmd->opcode = O_MACADDR2;
2424         cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2425
2426         mac = (ipfw_insn_mac *)cmd;
2427         get_mac_addr_mask(av[0], mac->addr, mac->mask); /* dst */
2428         get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2429         return cmd;
2430 }
2431
2432 static ipfw_insn *
2433 add_mactype(ipfw_insn *cmd, int ac, char *av)
2434 {
2435         if (ac < 1)
2436                 errx(EX_DATAERR, "missing MAC type");
2437         if (strcmp(av, "any") != 0) { /* we have a non-null type */
2438                 fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2439                 cmd->opcode = O_MAC_TYPE;
2440                 return cmd;
2441         } else
2442                 return NULL;
2443 }
2444
2445 static ipfw_insn *
2446 add_proto(ipfw_insn *cmd, char *av)
2447 {
2448         struct protoent *pe;
2449         u_char proto = 0;
2450
2451         if (!strncmp(av, "all", strlen(av)))
2452                 ; /* same as "ip" */
2453         else if ((proto = atoi(av)) > 0)
2454                 ; /* all done! */
2455         else if ((pe = getprotobyname(av)) != NULL)
2456                 proto = pe->p_proto;
2457         else
2458                 return NULL;
2459         if (proto != IPPROTO_IP)
2460                 fill_cmd(cmd, O_PROTO, 0, proto);
2461         return cmd;
2462 }
2463
2464 static ipfw_insn *
2465 add_srcip(ipfw_insn *cmd, char *av)
2466 {
2467         fill_ip((ipfw_insn_ip *)cmd, av);
2468         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2469                 cmd->opcode = O_IP_SRC_SET;
2470         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2471                 cmd->opcode = O_IP_SRC_ME;
2472         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2473                 cmd->opcode = O_IP_SRC;
2474         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2475                 cmd->opcode = O_IP_SRC_MASK;
2476         return cmd;
2477 }
2478
2479 static ipfw_insn *
2480 add_dstip(ipfw_insn *cmd, char *av)
2481 {
2482         fill_ip((ipfw_insn_ip *)cmd, av);
2483         if (cmd->opcode == O_IP_DST_SET)                        /* set */
2484                 ;
2485         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))          /* me */
2486                 cmd->opcode = O_IP_DST_ME;
2487         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))      /* one IP */
2488                 cmd->opcode = O_IP_DST;
2489         else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))       /* addr/mask */
2490                 cmd->opcode = O_IP_DST_MASK;
2491         return cmd;
2492 }
2493
2494 static ipfw_insn *
2495 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2496 {
2497         if (!strncmp(av, "any", strlen(av))) {
2498                 return NULL;
2499         } else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2500                 /* XXX todo: check that we have a protocol with ports */
2501                 cmd->opcode = opcode;
2502                 return cmd;
2503         }
2504         return NULL;
2505 }
2506
2507 /*
2508  * Parse arguments and assemble the microinstructions which make up a rule.
2509  * Rules are added into the 'rulebuf' and then copied in the correct order
2510  * into the actual rule.
2511  *
2512  * The syntax for a rule starts with the action, followed by an
2513  * optional log action, and the various match patterns.
2514  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2515  * (generated if the rule includes a keep-state option), then the
2516  * various match patterns, the "log" action, and the actual action.
2517  *
2518  */
2519 static void
2520 add(int ac, char *av[])
2521 {
2522         /*
2523          * rules are added into the 'rulebuf' and then copied in
2524          * the correct order into the actual rule.
2525          * Some things that need to go out of order (prob, action etc.)
2526          * go into actbuf[].
2527          */
2528         static u_int32_t rulebuf[255], actbuf[255], cmdbuf[255];
2529
2530         ipfw_insn *src, *dst, *cmd, *action, *prev = NULL;
2531         ipfw_insn *first_cmd;   /* first match pattern */
2532
2533         struct ip_fw *rule;
2534
2535         /*
2536          * various flags used to record that we entered some fields.
2537          */
2538         ipfw_insn *have_state = NULL;   /* check-state or keep-state */
2539
2540         int i;
2541
2542         int open_par = 0;       /* open parenthesis ( */
2543
2544         /* proto is here because it is used to fetch ports */
2545         u_char proto = IPPROTO_IP;      /* default protocol */
2546
2547         double match_prob = 1; /* match probability, default is always match */
2548
2549         bzero(actbuf, sizeof(actbuf));          /* actions go here */
2550         bzero(cmdbuf, sizeof(cmdbuf));
2551         bzero(rulebuf, sizeof(rulebuf));
2552
2553         rule = (struct ip_fw *)rulebuf;
2554         cmd = (ipfw_insn *)cmdbuf;
2555         action = (ipfw_insn *)actbuf;
2556
2557         av++; ac--;
2558
2559         /* [rule N]     -- Rule number optional */
2560         if (ac && isdigit(**av)) {
2561                 rule->rulenum = atoi(*av);
2562                 av++;
2563                 ac--;
2564         }
2565
2566         /* [set N]      -- set number (0..30), optional */
2567         if (ac > 1 && !strncmp(*av, "set", strlen(*av))) {
2568                 int set = strtoul(av[1], NULL, 10);
2569                 if (set < 0 || set > 30)
2570                         errx(EX_DATAERR, "illegal set %s", av[1]);
2571                 rule->set = set;
2572                 av += 2; ac -= 2;
2573         }
2574
2575         /* [prob D]     -- match probability, optional */
2576         if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2577                 match_prob = strtod(av[1], NULL);
2578
2579                 if (match_prob <= 0 || match_prob > 1)
2580                         errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2581                 av += 2; ac -= 2;
2582         }
2583
2584         /* action       -- mandatory */
2585         NEED1("missing action");
2586         i = match_token(rule_actions, *av);
2587         ac--; av++;
2588         action->len = 1;        /* default */
2589         switch(i) {
2590         case TOK_CHECKSTATE:
2591                 have_state = action;
2592                 action->opcode = O_CHECK_STATE;
2593                 break;
2594
2595         case TOK_ACCEPT:
2596                 action->opcode = O_ACCEPT;
2597                 break;
2598
2599         case TOK_DENY:
2600                 action->opcode = O_DENY;
2601                 action->arg1 = 0;
2602                 break;
2603
2604         case TOK_REJECT:
2605                 action->opcode = O_REJECT;
2606                 action->arg1 = ICMP_UNREACH_HOST;
2607                 break;
2608
2609         case TOK_RESET:
2610                 action->opcode = O_REJECT;
2611                 action->arg1 = ICMP_REJECT_RST;
2612                 break;
2613
2614         case TOK_UNREACH:
2615                 action->opcode = O_REJECT;
2616                 NEED1("missing reject code");
2617                 fill_reject_code(&action->arg1, *av);
2618                 ac--; av++;
2619                 break;
2620
2621         case TOK_COUNT:
2622                 action->opcode = O_COUNT;
2623                 break;
2624
2625         case TOK_QUEUE:
2626         case TOK_PIPE:
2627                 action->len = F_INSN_SIZE(ipfw_insn_pipe);
2628         case TOK_SKIPTO:
2629                 if (i == TOK_QUEUE)
2630                         action->opcode = O_QUEUE;
2631                 else if (i == TOK_PIPE)
2632                         action->opcode = O_PIPE;
2633                 else if (i == TOK_SKIPTO)
2634                         action->opcode = O_SKIPTO;
2635                 NEED1("missing skipto/pipe/queue number");
2636                 action->arg1 = strtoul(*av, NULL, 10);
2637                 av++; ac--;
2638                 break;
2639
2640         case TOK_DIVERT:
2641         case TOK_TEE:
2642                 action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2643                 NEED1("missing divert/tee port");
2644                 action->arg1 = strtoul(*av, NULL, 0);
2645                 if (action->arg1 == 0) {
2646                         struct servent *s;
2647                         setservent(1);
2648                         s = getservbyname(av[0], "divert");
2649                         if (s != NULL)
2650                                 action->arg1 = ntohs(s->s_port);
2651                         else
2652                                 errx(EX_DATAERR, "illegal divert/tee port");
2653                 }
2654                 ac--; av++;
2655                 break;
2656
2657         case TOK_FORWARD: {
2658                 ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2659                 char *s, *end;
2660
2661                 NEED1("missing forward address[:port]");
2662
2663                 action->opcode = O_FORWARD_IP;
2664                 action->len = F_INSN_SIZE(ipfw_insn_sa);
2665
2666                 p->sa.sin_len = sizeof(struct sockaddr_in);
2667                 p->sa.sin_family = AF_INET;
2668                 p->sa.sin_port = 0;
2669                 /*
2670                  * locate the address-port separator (':' or ',')
2671                  */
2672                 s = strchr(*av, ':');
2673                 if (s == NULL)
2674                         s = strchr(*av, ',');
2675                 if (s != NULL) {
2676                         *(s++) = '\0';
2677                         i = strtoport(s, &end, 0 /* base */, 0 /* proto */);
2678                         if (s == end)
2679                                 errx(EX_DATAERR,
2680                                     "illegal forwarding port ``%s''", s);
2681                         p->sa.sin_port = (u_short)i;
2682                 }
2683                 lookup_host(*av, &(p->sa.sin_addr));
2684                 }
2685                 ac--; av++;
2686                 break;
2687
2688         default:
2689                 errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2690         }
2691         action = next_cmd(action);
2692
2693         /*
2694          * [log [logamount N]]  -- log, optional
2695          *
2696          * If exists, it goes first in the cmdbuf, but then it is
2697          * skipped in the copy section to the end of the buffer.
2698          */
2699         if (ac && !strncmp(*av, "log", strlen(*av))) {
2700                 ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2701
2702                 cmd->len = F_INSN_SIZE(ipfw_insn_log);
2703                 cmd->opcode = O_LOG;
2704                 av++; ac--;
2705                 if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2706                         ac--; av++;
2707                         NEED1("logamount requires argument");
2708                         c->max_log = atoi(*av);
2709                         if (c->max_log < 0)
2710                                 errx(EX_DATAERR, "logamount must be positive");
2711                         ac--; av++;
2712                 }
2713                 cmd = next_cmd(cmd);
2714         }
2715
2716         if (have_state) /* must be a check-state, we are done */
2717                 goto done;
2718
2719 #define OR_START(target)                                        \
2720         if (ac && (*av[0] == '(' || *av[0] == '{')) {           \
2721                 if (open_par)                                   \
2722                         errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2723                 prev = NULL;                                    \
2724                 open_par = 1;                                   \
2725                 if ( (av[0])[1] == '\0') {                      \
2726                         ac--; av++;                             \
2727                 } else                                          \
2728                         (*av)++;                                \
2729         }                                                       \
2730         target:                                                 \
2731
2732
2733 #define CLOSE_PAR                                               \
2734         if (open_par) {                                         \
2735                 if (ac && (                                     \
2736                     !strncmp(*av, ")", strlen(*av)) ||          \
2737                     !strncmp(*av, "}", strlen(*av)) )) {        \
2738                         prev = NULL;                            \
2739                         open_par = 0;                           \
2740                         ac--; av++;                             \
2741                 } else                                          \
2742                         errx(EX_USAGE, "missing \")\"\n");      \
2743         }
2744
2745 #define NOT_BLOCK                                               \
2746         if (ac && !strncmp(*av, "not", strlen(*av))) {          \
2747                 if (cmd->len & F_NOT)                           \
2748                         errx(EX_USAGE, "double \"not\" not allowed\n"); \
2749                 cmd->len |= F_NOT;                              \
2750                 ac--; av++;                                     \
2751         }
2752
2753 #define OR_BLOCK(target)                                        \
2754         if (ac && !strncmp(*av, "or", strlen(*av))) {           \
2755                 if (prev == NULL || open_par == 0)              \
2756                         errx(EX_DATAERR, "invalid OR block");   \
2757                 prev->len |= F_OR;                              \
2758                 ac--; av++;                                     \
2759                 goto target;                                    \
2760         }                                                       \
2761         CLOSE_PAR;
2762
2763         first_cmd = cmd;
2764
2765 #if 0
2766         /*
2767          * MAC addresses, optional.
2768          * If we have this, we skip the part "proto from src to dst"
2769          * and jump straight to the option parsing.
2770          */
2771         NOT_BLOCK;
2772         NEED1("missing protocol");
2773         if (!strncmp(*av, "MAC", strlen(*av)) ||
2774             !strncmp(*av, "mac", strlen(*av))) {
2775                 ac--; av++;     /* the "MAC" keyword */
2776                 add_mac(cmd, ac, av); /* exits in case of errors */
2777                 cmd = next_cmd(cmd);
2778                 ac -= 2; av += 2;       /* dst-mac and src-mac */
2779                 NOT_BLOCK;
2780                 NEED1("missing mac type");
2781                 if (add_mactype(cmd, ac, av[0]))
2782                         cmd = next_cmd(cmd);
2783                 ac--; av++;     /* any or mac-type */
2784                 goto read_options;
2785         }
2786 #endif
2787
2788         /*
2789          * protocol, mandatory
2790          */
2791     OR_START(get_proto);
2792         NOT_BLOCK;
2793         NEED1("missing protocol");
2794         if (add_proto(cmd, *av)) {
2795                 av++; ac--;
2796                 if (F_LEN(cmd) == 0)    /* plain IP */
2797                         proto = 0;
2798                 else {
2799                         proto = cmd->arg1;
2800                         prev = cmd;
2801                         cmd = next_cmd(cmd);
2802                 }
2803         } else if (first_cmd != cmd) {
2804                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2805         } else
2806                 goto read_options;
2807     OR_BLOCK(get_proto);
2808
2809         /*
2810          * "from", mandatory
2811          */
2812         if (!ac || strncmp(*av, "from", strlen(*av)))
2813                 errx(EX_USAGE, "missing ``from''");
2814         ac--; av++;
2815
2816         /*
2817          * source IP, mandatory
2818          */
2819     OR_START(source_ip);
2820         NOT_BLOCK;      /* optional "not" */
2821         NEED1("missing source address");
2822         if (add_srcip(cmd, *av)) {
2823                 ac--; av++;
2824                 if (F_LEN(cmd) != 0) {  /* ! any */
2825                         prev = cmd;
2826                         cmd = next_cmd(cmd);
2827                 }
2828         }
2829     OR_BLOCK(source_ip);
2830
2831         /*
2832          * source ports, optional
2833          */
2834         NOT_BLOCK;      /* optional "not" */
2835         if (ac) {
2836                 if (!strncmp(*av, "any", strlen(*av)) ||
2837                     add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
2838                         ac--; av++;
2839                         if (F_LEN(cmd) != 0)
2840                                 cmd = next_cmd(cmd);
2841                 }
2842         }
2843
2844         /*
2845          * "to", mandatory
2846          */
2847         if (!ac || strncmp(*av, "to", strlen(*av)))
2848                 errx(EX_USAGE, "missing ``to''");
2849         av++; ac--;
2850
2851         /*
2852          * destination, mandatory
2853          */
2854     OR_START(dest_ip);
2855         NOT_BLOCK;      /* optional "not" */
2856         NEED1("missing dst address");
2857         if (add_dstip(cmd, *av)) {
2858                 ac--; av++;
2859                 if (F_LEN(cmd) != 0) {  /* ! any */
2860                         prev = cmd;
2861                         cmd = next_cmd(cmd);
2862                 }
2863         }
2864     OR_BLOCK(dest_ip);
2865
2866         /*
2867          * dest. ports, optional
2868          */
2869         NOT_BLOCK;      /* optional "not" */
2870         if (ac) {
2871                 if (!strncmp(*av, "any", strlen(*av)) ||
2872                     add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
2873                         ac--; av++;
2874                         if (F_LEN(cmd) != 0)
2875                                 cmd = next_cmd(cmd);
2876                 }
2877         }
2878
2879 read_options:
2880         if (ac && first_cmd == cmd) {
2881                 /*
2882                  * nothing specified so far, store in the rule to ease
2883                  * printout later.
2884                  */
2885                  rule->_pad = 1;
2886         }
2887         prev = NULL;
2888         while (ac) {
2889                 char *s;
2890                 ipfw_insn_u32 *cmd32;   /* alias for cmd */
2891
2892                 s = *av;
2893                 cmd32 = (ipfw_insn_u32 *)cmd;
2894
2895                 if (*s == '!') {        /* alternate syntax for NOT */
2896                         if (cmd->len & F_NOT)
2897                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2898                         cmd->len = F_NOT;
2899                         s++;
2900                 }
2901                 i = match_token(rule_options, s);
2902                 ac--; av++;
2903                 switch(i) {
2904                 case TOK_NOT:
2905                         if (cmd->len & F_NOT)
2906                                 errx(EX_USAGE, "double \"not\" not allowed\n");
2907                         cmd->len = F_NOT;
2908                         break;
2909
2910                 case TOK_OR:
2911                         if (open_par == 0 || prev == NULL)
2912                                 errx(EX_USAGE, "invalid \"or\" block\n");
2913                         prev->len |= F_OR;
2914                         break;
2915
2916                 case TOK_STARTBRACE:
2917                         if (open_par)
2918                                 errx(EX_USAGE, "+nested \"(\" not allowed\n");
2919                         open_par = 1;
2920                         break;
2921
2922                 case TOK_ENDBRACE:
2923                         if (!open_par)
2924                                 errx(EX_USAGE, "+missing \")\"\n");
2925                         open_par = 0;
2926                         prev = NULL;
2927                         break;
2928
2929                 case TOK_IN:
2930                         fill_cmd(cmd, O_IN, 0, 0);
2931                         break;
2932
2933                 case TOK_OUT:
2934                         cmd->len ^= F_NOT; /* toggle F_NOT */
2935                         fill_cmd(cmd, O_IN, 0, 0);
2936                         break;
2937
2938                 case TOK_FRAG:
2939                         fill_cmd(cmd, O_FRAG, 0, 0);
2940                         break;
2941
2942                 case TOK_LAYER2:
2943                         fill_cmd(cmd, O_LAYER2, 0, 0);
2944                         break;
2945
2946                 case TOK_XMIT:
2947                 case TOK_RECV:
2948                 case TOK_VIA:
2949                         NEED1("recv, xmit, via require interface name"
2950                                 " or address");
2951                         fill_iface((ipfw_insn_if *)cmd, av[0]);
2952                         ac--; av++;
2953                         if (F_LEN(cmd) == 0)    /* not a valid address */
2954                                 break;
2955                         if (i == TOK_XMIT)
2956                                 cmd->opcode = O_XMIT;
2957                         else if (i == TOK_RECV)
2958                                 cmd->opcode = O_RECV;
2959                         else if (i == TOK_VIA)
2960                                 cmd->opcode = O_VIA;
2961                         break;
2962
2963                 case TOK_ICMPTYPES:
2964                         NEED1("icmptypes requires list of types");
2965                         fill_icmptypes((ipfw_insn_u32 *)cmd, *av);
2966                         av++; ac--;
2967                         break;
2968
2969                 case TOK_IPTTL:
2970                         NEED1("ipttl requires TTL");
2971                         fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
2972                         ac--; av++;
2973                         break;
2974
2975                 case TOK_IPID:
2976                         NEED1("ipid requires length");
2977                         fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
2978                         ac--; av++;
2979                         break;
2980
2981                 case TOK_IPLEN:
2982                         NEED1("iplen requires length");
2983                         fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
2984                         ac--; av++;
2985                         break;
2986
2987                 case TOK_IPVER:
2988                         NEED1("ipver requires version");
2989                         fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
2990                         ac--; av++;
2991                         break;
2992
2993                 case TOK_IPPRECEDENCE:
2994                         NEED1("ipprecedence requires value");
2995                         fill_cmd(cmd, O_IPPRECEDENCE, 0,
2996                             (strtoul(*av, NULL, 0) & 7) << 5);
2997                         ac--; av++;
2998                         break;
2999
3000                 case TOK_IPOPTS:
3001                         NEED1("missing argument for ipoptions");
3002                         fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3003                         ac--; av++;
3004                         break;
3005
3006                 case TOK_IPTOS:
3007                         NEED1("missing argument for iptos");
3008                         fill_flags(cmd, O_IPTOS, f_iptos, *av);
3009                         ac--; av++;
3010                         break;
3011
3012                 case TOK_UID:
3013                         NEED1("uid requires argument");
3014                     {
3015                         char *end;
3016                         uid_t uid;
3017                         struct passwd *pwd;
3018
3019                         cmd->opcode = O_UID;
3020                         uid = strtoul(*av, &end, 0);
3021                         pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3022                         if (pwd == NULL)
3023                                 errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3024                         cmd32->d[0] = pwd->pw_uid;
3025                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3026                         ac--; av++;
3027                     }
3028                         break;
3029
3030                 case TOK_GID:
3031                         NEED1("gid requires argument");
3032                     {
3033                         char *end;
3034                         gid_t gid;
3035                         struct group *grp;
3036
3037                         cmd->opcode = O_GID;
3038                         gid = strtoul(*av, &end, 0);
3039                         grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3040                         if (grp == NULL)
3041                                 errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3042                         cmd32->d[0] = grp->gr_gid;
3043                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3044                         ac--; av++;
3045                     }
3046                         break;
3047
3048                 case TOK_ESTAB:
3049                         fill_cmd(cmd, O_ESTAB, 0, 0);
3050                         break;
3051
3052                 case TOK_SETUP:
3053                         fill_cmd(cmd, O_TCPFLAGS, 0,
3054                                 (TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3055                         break;
3056
3057                 case TOK_TCPOPTS:
3058                         NEED1("missing argument for tcpoptions");
3059                         fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3060                         ac--; av++;
3061                         break;
3062
3063                 case TOK_TCPSEQ:
3064                 case TOK_TCPACK:
3065                         NEED1("tcpseq/tcpack requires argument");
3066                         cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3067                         cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3068                         cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3069                         ac--; av++;
3070                         break;
3071
3072                 case TOK_TCPWIN:
3073                         NEED1("tcpwin requires length");
3074                         fill_cmd(cmd, O_TCPWIN, 0,
3075                             htons(strtoul(*av, NULL, 0)));
3076                         ac--; av++;
3077                         break;
3078
3079                 case TOK_TCPFLAGS:
3080                         NEED1("missing argument for tcpflags");
3081                         cmd->opcode = O_TCPFLAGS;
3082                         fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3083                         ac--; av++;
3084                         break;
3085
3086                 case TOK_KEEPSTATE:
3087                         if (open_par)
3088                                 errx(EX_USAGE, "keep-state cannot be part "
3089                                     "of an or block");
3090                         if (have_state)
3091                                 errx(EX_USAGE, "only one of keep-state "
3092                                         "and limit is allowed");
3093                         have_state = cmd;
3094                         fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3095                         break;
3096
3097                 case TOK_LIMIT:
3098                         if (open_par)
3099                                 errx(EX_USAGE, "limit cannot be part "
3100                                     "of an or block");
3101                         if (have_state)
3102                                 errx(EX_USAGE, "only one of keep-state "
3103                                         "and limit is allowed");
3104                         NEED1("limit needs mask and # of connections");
3105                         have_state = cmd;
3106                     {
3107                         ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3108
3109                         cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3110                         cmd->opcode = O_LIMIT;
3111                         c->limit_mask = 0;
3112                         c->conn_limit = 0;
3113                         for (; ac >1 ;) {
3114                                 int val;
3115
3116                                 val = match_token(limit_masks, *av);
3117                                 if (val <= 0)
3118                                         break;
3119                                 c->limit_mask |= val;
3120                                 ac--; av++;
3121                         }
3122                         c->conn_limit = atoi(*av);
3123                         if (c->conn_limit == 0)
3124                                 errx(EX_USAGE, "limit: limit must be >0");
3125                         if (c->limit_mask == 0)
3126                                 errx(EX_USAGE, "missing limit mask");
3127                         ac--; av++;
3128                     }
3129                         break;
3130
3131                 case TOK_PROTO:
3132                         NEED1("missing protocol");
3133                         if (add_proto(cmd, *av)) {
3134                                 proto = cmd->arg1;
3135                                 ac--; av++;
3136                         } else
3137                                 errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3138                         break;
3139
3140                 case TOK_SRCIP:
3141                         NEED1("missing source IP");
3142                         if (add_srcip(cmd, *av)) {
3143                                 ac--; av++;
3144                         }
3145                         break;
3146
3147                 case TOK_DSTIP:
3148                         NEED1("missing destination IP");
3149                         if (add_dstip(cmd, *av)) {
3150                                 ac--; av++;
3151                         }
3152                         break;
3153
3154                 case TOK_SRCPORT:
3155                         NEED1("missing source port");
3156                         if (!strncmp(*av, "any", strlen(*av)) ||
3157                             add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3158                                 ac--; av++;
3159                         } else
3160                                 errx(EX_DATAERR, "invalid source port %s", *av);
3161                         break;
3162
3163                 case TOK_DSTPORT:
3164                         NEED1("missing destination port");
3165                         if (!strncmp(*av, "any", strlen(*av)) ||
3166                             add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3167                                 ac--; av++;
3168                         } else
3169                                 errx(EX_DATAERR, "invalid destination port %s",
3170                                     *av);
3171                         break;
3172
3173                 case TOK_MAC:
3174                         if (ac < 2)
3175                                 errx(EX_USAGE, "MAC dst-mac src-mac");
3176                         if (add_mac(cmd, ac, av)) {
3177                                 ac -= 2; av += 2;
3178                         }
3179                         break;
3180
3181                 case TOK_MACTYPE:
3182                         NEED1("missing mac type");
3183                         if (!add_mactype(cmd, ac, *av))
3184                                 errx(EX_DATAERR, "invalid mac type %s", *av);
3185                         ac--; av++;
3186                         break;
3187
3188                 default:
3189                         errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s);
3190                 }
3191                 if (F_LEN(cmd) > 0) {   /* prepare to advance */
3192                         prev = cmd;
3193                         cmd = next_cmd(cmd);
3194                 }
3195         }
3196
3197 done:
3198         /*
3199          * Now copy stuff into the rule.
3200          * If we have a keep-state option, the first instruction
3201          * must be a PROBE_STATE (which is generated here).
3202          * If we have a LOG option, it was stored as the first command,
3203          * and now must be moved to the top of the action part.
3204          */
3205         dst = (ipfw_insn *)rule->cmd;
3206
3207         /*
3208          * First thing to write into the command stream is the match probability.
3209          */
3210         if (match_prob != 1) { /* 1 means always match */
3211                 dst->opcode = O_PROB;
3212                 dst->len = 2;
3213                 *((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3214                 dst += dst->len;
3215         }
3216
3217         /*
3218          * generate O_PROBE_STATE if necessary
3219          */
3220         if (have_state && have_state->opcode != O_CHECK_STATE) {
3221                 fill_cmd(dst, O_PROBE_STATE, 0, 0);
3222                 dst = next_cmd(dst);
3223         }
3224         /*
3225          * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT
3226          */
3227         for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3228                 i = F_LEN(src);
3229
3230                 switch (src->opcode) {
3231                 case O_LOG:
3232                 case O_KEEP_STATE:
3233                 case O_LIMIT:
3234                         break;
3235                 default:
3236                         bcopy(src, dst, i * sizeof(u_int32_t));
3237                         dst += i;
3238                 }
3239         }
3240
3241         /*
3242          * put back the have_state command as last opcode
3243          */
3244         if (have_state && have_state->opcode != O_CHECK_STATE) {
3245                 i = F_LEN(have_state);
3246                 bcopy(have_state, dst, i * sizeof(u_int32_t));
3247                 dst += i;
3248         }
3249         /*
3250          * start action section
3251          */
3252         rule->act_ofs = dst - rule->cmd;
3253
3254         /*
3255          * put back O_LOG if necessary
3256          */
3257         src = (ipfw_insn *)cmdbuf;
3258         if ( src->opcode == O_LOG ) {
3259                 i = F_LEN(src);
3260                 bcopy(src, dst, i * sizeof(u_int32_t));
3261                 dst += i;
3262         }
3263         /*
3264          * copy all other actions
3265          */
3266         for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3267                 i = F_LEN(src);
3268                 bcopy(src, dst, i * sizeof(u_int32_t));
3269                 dst += i;
3270         }
3271
3272         rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
3273         i = (void *)dst - (void *)rule;
3274         if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
3275                 err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3276         if (!do_quiet)
3277                 show_ipfw(rule, 10, 10);
3278 }
3279
3280 static void
3281 zero(int ac, char *av[])
3282 {
3283         int rulenum;
3284         int failed = EX_OK;
3285
3286         av++; ac--;
3287
3288         if (!ac) {
3289                 /* clear all entries */
3290                 if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
3291                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
3292                 if (!do_quiet)
3293                         printf("Accounting cleared.\n");
3294
3295                 return;
3296         }
3297
3298         while (ac) {
3299                 /* Rule number */
3300                 if (isdigit(**av)) {
3301                         rulenum = atoi(*av);
3302                         av++;
3303                         ac--;
3304                         if (setsockopt(s, IPPROTO_IP,
3305                             IP_FW_ZERO, &rulenum, sizeof rulenum)) {
3306                                 warn("rule %u: setsockopt(IP_FW_ZERO)",
3307                                     rulenum);
3308                                 failed = EX_UNAVAILABLE;
3309                         } else if (!do_quiet)
3310                                 printf("Entry %d cleared\n", rulenum);
3311                 } else {
3312                         errx(EX_USAGE, "invalid rule number ``%s''", *av);
3313                 }
3314         }
3315         if (failed != EX_OK)
3316                 exit(failed);
3317 }
3318
3319 static void
3320 resetlog(int ac, char *av[])
3321 {
3322         int rulenum;
3323         int failed = EX_OK;
3324
3325         av++; ac--;
3326
3327         if (!ac) {
3328                 /* clear all entries */
3329                 if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
3330                         err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
3331                 if (!do_quiet)
3332                         printf("Logging counts reset.\n");
3333
3334                 return;
3335         }
3336
3337         while (ac) {
3338                 /* Rule number */
3339                 if (isdigit(**av)) {
3340                         rulenum = atoi(*av);
3341                         av++;
3342                         ac--;
3343                         if (setsockopt(s, IPPROTO_IP,
3344                             IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
3345                                 warn("rule %u: setsockopt(IP_FW_RESETLOG)",
3346                                     rulenum);
3347                                 failed = EX_UNAVAILABLE;
3348                         } else if (!do_quiet)
3349                                 printf("Entry %d logging count reset\n",
3350                                     rulenum);
3351                 } else {
3352                         errx(EX_DATAERR, "invalid rule number ``%s''", *av);
3353                 }
3354         }
3355         if (failed != EX_OK)
3356                 exit(failed);
3357 }
3358
3359 static void
3360 flush(void)
3361 {
3362         int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3363
3364         if (!do_force && !do_quiet) { /* need to ask user */
3365                 int c;
3366
3367                 printf("Are you sure? [yn] ");
3368                 fflush(stdout);
3369                 do {
3370                         c = toupper(getc(stdin));
3371                         while (c != '\n' && getc(stdin) != '\n')
3372                                 if (feof(stdin))
3373                                         return; /* and do not flush */
3374                 } while (c != 'Y' && c != 'N');
3375                 printf("\n");
3376                 if (c == 'N')   /* user said no */
3377                         return;
3378         }
3379         if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
3380                 err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3381                     do_pipe ? "DUMMYNET" : "FW");
3382         if (!do_quiet)
3383                 printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
3384 }
3385
3386 static int
3387 ipfw_main(int ac, char **av)
3388 {
3389         int ch;
3390
3391         if (ac == 1)
3392                 show_usage();
3393
3394         /* Set the force flag for non-interactive processes */
3395         do_force = !isatty(STDIN_FILENO);
3396
3397         optind = optreset = 1;
3398         while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1)
3399                 switch (ch) {
3400                 case 'h': /* help */
3401                         help();
3402                         break;  /* NOTREACHED */
3403
3404                 case 's': /* sort */
3405                         do_sort = atoi(optarg);
3406                         break;
3407                 case 'a':
3408                         do_acct = 1;
3409                         break;
3410                 case 'c':
3411                         do_compact = 1;
3412                         break;
3413                 case 'd':
3414                         do_dynamic = 1;
3415                         break;
3416                 case 'e':
3417                         do_expired = 1;
3418                         break;
3419                 case 'f':
3420                         do_force = 1;
3421                         break;
3422                 case 'N':
3423                         do_resolv = 1;
3424                         break;
3425                 case 'q':
3426                         do_quiet = 1;
3427                         break;
3428                 case 'S':
3429                         show_sets = 1;
3430                         break;
3431                 case 't':
3432                         do_time = 1;
3433                         break;
3434                 case 'v': /* verbose */
3435                         verbose++;
3436                         break;
3437                 default:
3438                         show_usage();
3439                 }
3440
3441         ac -= optind;
3442         av += optind;
3443         NEED1("bad arguments, for usage summary ``ipfw''");
3444
3445         /*
3446          * optional: pipe or queue
3447          */
3448         if (!strncmp(*av, "pipe", strlen(*av))) {
3449                 do_pipe = 1;
3450                 ac--;
3451                 av++;
3452         } else if (!strncmp(*av, "queue", strlen(*av))) {
3453                 do_pipe = 2;
3454                 ac--;
3455                 av++;
3456         }
3457         NEED1("missing command");
3458
3459         /*
3460          * for pipes and queues we normally say 'pipe NN config'
3461          * but the code is easier to parse as 'pipe config NN'
3462          * so we swap the two arguments.
3463          */
3464         if (do_pipe > 0 && ac > 1 && *av[0] >= '0' && *av[0] <= '9') {
3465                 char *p = av[0];
3466                 av[0] = av[1];
3467                 av[1] = p;
3468         }
3469         if (!strncmp(*av, "add", strlen(*av)))
3470                 add(ac, av);
3471         else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
3472                 config_pipe(ac, av);
3473         else if (!strncmp(*av, "delete", strlen(*av)))
3474                 delete(ac, av);
3475         else if (!strncmp(*av, "flush", strlen(*av)))
3476                 flush();
3477         else if (!strncmp(*av, "zero", strlen(*av)))
3478                 zero(ac, av);
3479         else if (!strncmp(*av, "resetlog", strlen(*av)))
3480                 resetlog(ac, av);
3481         else if (!strncmp(*av, "print", strlen(*av)) ||
3482                  !strncmp(*av, "list", strlen(*av)))
3483                 list(ac, av);
3484         else if (!strncmp(*av, "enable", strlen(*av)))
3485                 sysctl_handler(ac, av, 1);
3486         else if (!strncmp(*av, "disable", strlen(*av)))
3487                 sysctl_handler(ac, av, 0);
3488         else if (!strncmp(*av, "set", strlen(*av)))
3489                 sets_handler(ac, av);
3490         else if (!strncmp(*av, "show", strlen(*av))) {
3491                 do_acct++;
3492                 list(ac, av);
3493         } else
3494                 errx(EX_USAGE, "bad command `%s'", *av);
3495         return 0;
3496 }
3497
3498
3499 static void
3500 ipfw_readfile(int ac, char *av[])
3501 {
3502 #define MAX_ARGS        32
3503 #define WHITESP         " \t\f\v\n\r"
3504         char    buf[BUFSIZ];
3505         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
3506         char    linename[10];
3507         int     i=0, lineno=0, qflag=0, pflag=0, status;
3508         FILE    *f = NULL;
3509         pid_t   preproc = 0;
3510         int     c;
3511
3512         while ((c = getopt(ac, av, "D:U:p:q")) != -1)
3513                 switch(c) {
3514                 case 'D':
3515                         if (!pflag)
3516                                 errx(EX_USAGE, "-D requires -p");
3517                         if (i > MAX_ARGS - 2)
3518                                 errx(EX_USAGE,
3519                                      "too many -D or -U options");
3520                         args[i++] = "-D";
3521                         args[i++] = optarg;
3522                         break;
3523
3524                 case 'U':
3525                         if (!pflag)
3526                                 errx(EX_USAGE, "-U requires -p");
3527                         if (i > MAX_ARGS - 2)
3528                                 errx(EX_USAGE,
3529                                      "too many -D or -U options");
3530                         args[i++] = "-U";
3531                         args[i++] = optarg;
3532                         break;
3533
3534                 case 'p':
3535                         pflag = 1;
3536                         cmd = optarg;
3537                         args[0] = cmd;
3538                         i = 1;
3539                         break;
3540
3541                 case 'q':
3542                         qflag = 1;
3543                         break;
3544
3545                 default:
3546                         errx(EX_USAGE, "bad arguments, for usage"
3547                              " summary ``ipfw''");
3548                 }
3549
3550         av += optind;
3551         ac -= optind;
3552         if (ac != 1)
3553                 errx(EX_USAGE, "extraneous filename arguments");
3554
3555         if ((f = fopen(av[0], "r")) == NULL)
3556                 err(EX_UNAVAILABLE, "fopen: %s", av[0]);
3557
3558         if (pflag) {
3559                 /* pipe through preprocessor (cpp or m4) */
3560                 int pipedes[2];
3561
3562                 args[i] = 0;
3563
3564                 if (pipe(pipedes) == -1)
3565                         err(EX_OSERR, "cannot create pipe");
3566
3567                 switch((preproc = fork())) {
3568                 case -1:
3569                         err(EX_OSERR, "cannot fork");
3570
3571                 case 0:
3572                         /* child */
3573                         if (dup2(fileno(f), 0) == -1
3574                             || dup2(pipedes[1], 1) == -1)
3575                                 err(EX_OSERR, "dup2()");
3576                         fclose(f);
3577                         close(pipedes[1]);
3578                         close(pipedes[0]);
3579                         execvp(cmd, args);
3580                         err(EX_OSERR, "execvp(%s) failed", cmd);
3581
3582                 default:
3583                         /* parent */
3584                         fclose(f);
3585                         close(pipedes[1]);
3586                         if ((f = fdopen(pipedes[0], "r")) == NULL) {
3587                                 int savederrno = errno;
3588
3589                                 kill(preproc, SIGTERM);
3590                                 errno = savederrno;
3591                                 err(EX_OSERR, "fdopen()");
3592                         }
3593                 }
3594         }
3595
3596         while (fgets(buf, BUFSIZ, f)) {
3597                 lineno++;
3598                 sprintf(linename, "Line %d", lineno);
3599                 args[0] = linename;
3600
3601                 if (*buf == '#')
3602                         continue;
3603                 if ((p = strchr(buf, '#')) != NULL)
3604                         *p = '\0';
3605                 i = 1;
3606                 if (qflag)
3607                         args[i++] = "-q";
3608                 for (a = strtok(buf, WHITESP);
3609                     a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
3610                         args[i] = a;
3611                 if (i == (qflag? 2: 1))
3612                         continue;
3613                 if (i == MAX_ARGS)
3614                         errx(EX_USAGE, "%s: too many arguments",
3615                             linename);
3616                 args[i] = NULL;
3617
3618                 ipfw_main(i, args);
3619         }
3620         fclose(f);
3621         if (pflag) {
3622                 if (waitpid(preproc, &status, 0) == -1)
3623                         errx(EX_OSERR, "waitpid()");
3624                 if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
3625                         errx(EX_UNAVAILABLE,
3626                             "preprocessor exited with status %d",
3627                             WEXITSTATUS(status));
3628                 else if (WIFSIGNALED(status))
3629                         errx(EX_UNAVAILABLE,
3630                             "preprocessor exited with signal %d",
3631                             WTERMSIG(status));
3632         }
3633 }
3634
3635 int
3636 main(int ac, char *av[])
3637 {
3638         s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
3639         if (s < 0)
3640                 err(EX_UNAVAILABLE, "socket");
3641
3642         /*
3643          * If the last argument is an absolute pathname, interpret it
3644          * as a file to be preprocessed.
3645          */
3646
3647         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
3648                 ipfw_readfile(ac, av);
3649         else
3650                 ipfw_main(ac, av);
3651         return EX_OK;
3652 }