sbin/ip6fw/ip6fw.c

   1 /*      $KAME: ip6fw.c,v 1.13 2001/06/22 05:51:16 itojun Exp $  */
   2
   3 /*
   4  * Copyright (C) 1998, 1999, 2000 and 2001 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp
  34  * Copyright (c) 1994 Ugen J.S.Antsilevich
  35  *
  36  * Idea and grammar partially left from:
  37  * Copyright (c) 1993 Daniel Boulet
  38  *
  39  * Redistribution and use in source forms, with and without modification,
  40  * are permitted provided that this entire comment appears intact.
  41  *
  42  * Redistribution in binary form may occur without any restrictions.
  43  * Obviously, it would be nice if you gave credit where credit is due
  44  * but requiring it would be too onerous.
  45  *
  46  * This software is provided ``AS IS'' without any warranties of any kind.
  47  *
  48  * NEW command line interface for IP firewall facility
  49  *
  50  * $Id: ip6fw.c,v 1.1.2.2.2.2 1999/05/14 05:13:50 shin Exp $
  51  * $FreeBSD: src/sbin/ip6fw/ip6fw.c,v 1.1.2.9 2003/04/05 10:54:51 ume Exp $
  52  * $DragonFly: src/sbin/ip6fw/ip6fw.c,v 1.4 2003/09/28 14:39:18 hmp Exp $
  53  */
  54
  55 #include <sys/types.h>
  56 #include <sys/queue.h>
  57 #include <sys/socket.h>
  58 #include <sys/sockio.h>
  59 #include <sys/time.h>
  60 #include <sys/ioctl.h>
  61 #include <sys/wait.h>
  62
  63 #include <ctype.h>
  64 #include <err.h>
  65 #include <limits.h>
  66 #include <netdb.h>
  67 #include <stdio.h>
  68 #include <stdlib.h>
  69 #include <stdarg.h>
  70 #include <string.h>
  71 #include <time.h>
  72 #include <unistd.h>
  73 #include <errno.h>
  74 #include <signal.h>
  75 #include <sysexits.h>
  76
  77 #include <net/if.h>
  78 #include <netinet/in.h>
  79 #include <netinet/in_systm.h>
  80 #include <netinet/ip6.h>
  81 #include <netinet/icmp6.h>
  82 #include <net/ip6fw/ip6_fw.h>
  83 #include <netinet/tcp.h>
  84 #include <arpa/inet.h>
  85
  86 int             lineno = -1;
  87
  88 int             s;                              /* main RAW socket         */
  89 int             do_resolv=0;                    /* Would try to resolv all */
  90 int             do_acct=0;                      /* Show packet/byte count  */
  91 int             do_time=0;                      /* Show time stamps        */
  92 int             do_quiet=0;                     /* Be quiet in add and flush  */
  93 int             do_force=0;                     /* Don't ask for confirmation */
  94
  95 struct icmpcode {
  96         int     code;
  97         char    *str;
  98 };
  99
 100 static struct icmpcode icmp6codes[] = {
 101       { ICMP6_DST_UNREACH_NOROUTE,      "noroute" },
 102       { ICMP6_DST_UNREACH_ADMIN,        "admin" },
 103       { ICMP6_DST_UNREACH_NOTNEIGHBOR,  "notneighbor" },
 104       { ICMP6_DST_UNREACH_ADDR,         "addr" },
 105       { ICMP6_DST_UNREACH_NOPORT,       "noport" },
 106       { 0, NULL }
 107 };
 108
 109 static char ntop_buf[INET6_ADDRSTRLEN];
 110
 111 static void show_usage(const char *fmt, ...);
 112
 113 static int
 114 mask_bits(u_char *m_ad, int m_len)
 115 {
 116         int h_num = 0,i;
 117
 118         for (i = 0; i < m_len; i++, m_ad++) {
 119                 if (*m_ad != 0xff)
 120                         break;
 121                 h_num += 8;
 122         }
 123         if (i < m_len) {
 124                 switch (*m_ad) {
 125 #define MASKLEN(m, l)   case m: h_num += l; break
 126                 MASKLEN(0xfe, 7);
 127                 MASKLEN(0xfc, 6);
 128                 MASKLEN(0xf8, 5);
 129                 MASKLEN(0xf0, 4);
 130                 MASKLEN(0xe0, 3);
 131                 MASKLEN(0xc0, 2);
 132                 MASKLEN(0x80, 1);
 133 #undef  MASKLEN
 134                 }
 135         }
 136         return h_num;
 137 }
 138
 139 static int pl2m[9] = { 0x00, 0x80, 0xc0, 0xe0, 0xf0, 0xf8, 0xfc, 0xfe, 0xff };
 140
 141 struct in6_addr *plen2mask(int n)
 142 {
 143         static struct in6_addr ia;
 144         u_char  *p;
 145         int     i;
 146
 147         memset(&ia, 0, sizeof(struct in6_addr));
 148         p = (u_char *)&ia;
 149         for (i = 0; i < 16; i++, p++, n -= 8) {
 150                 if (n >= 8) {
 151                         *p = 0xff;
 152                         continue;
 153                 }
 154                 *p = pl2m[n];
 155                 break;
 156         }
 157         return &ia;
 158 }
 159
 160 void
 161 print_port(u_char prot, u_short port, const char *comma)
 162 {
 163         struct servent *se;
 164         struct protoent *pe;
 165         const char *protocol;
 166         int printed = 0;
 167
 168         if (do_resolv) {
 169                 pe = getprotobynumber(prot);
 170                 if (pe)
 171                         protocol = pe->p_name;
 172                 else
 173                         protocol = NULL;
 174
 175                 se = getservbyport(htons(port), protocol);
 176                 if (se) {
 177                         printf("%s%s", comma, se->s_name);
 178                         printed = 1;
 179                 }
 180         }
 181         if (!printed)
 182                 printf("%s%d",comma,port);
 183 }
 184
 185 static void
 186 print_iface(char *key, union ip6_fw_if *un, int byname)
 187 {
 188         char ifnb[IP6FW_IFNLEN+1];
 189
 190         if (byname) {
 191                 strncpy(ifnb, un->fu_via_if.name, IP6FW_IFNLEN);
 192                 ifnb[IP6FW_IFNLEN]='\0';
 193                 if (un->fu_via_if.unit == -1)
 194                         printf(" %s %s*", key, ifnb);
 195                 else
 196                         printf(" %s %s%d", key, ifnb, un->fu_via_if.unit);
 197         } else if (!IN6_IS_ADDR_UNSPECIFIED(&un->fu_via_ip6)) {
 198                 printf(" %s %s", key, inet_ntop(AF_INET6,&un->fu_via_ip6,ntop_buf,sizeof(ntop_buf)));
 199         } else
 200                 printf(" %s any", key);
 201 }
 202
 203 static void
 204 print_reject_code(int code)
 205 {
 206         struct icmpcode *ic;
 207
 208         for (ic = icmp6codes; ic->str; ic++)
 209                 if (ic->code == code) {
 210                         printf("%s", ic->str);
 211                         return;
 212                 }
 213         printf("%u", code);
 214 }
 215
 216 static void
 217 show_ip6fw(struct ip6_fw *chain)
 218 {
 219         char *comma;
 220         struct hostent *he;
 221         struct protoent *pe;
 222         int i, mb;
 223         int nsp = IPV6_FW_GETNSRCP(chain);
 224         int ndp = IPV6_FW_GETNDSTP(chain);
 225
 226         if (do_resolv)
 227                 setservent(1/*stayopen*/);
 228
 229         printf("%05u ", chain->fw_number);
 230
 231         if (do_acct)
 232                 printf("%10lu %10lu ",chain->fw_pcnt,chain->fw_bcnt);
 233
 234         if (do_time)
 235         {
 236                 if (chain->timestamp)
 237                 {
 238                         char timestr[30];
 239
 240                         strcpy(timestr, ctime((time_t *)&chain->timestamp));
 241                         *strchr(timestr, '\n') = '\0';
 242                         printf("%s ", timestr);
 243                 }
 244                 else
 245                         printf("                         ");
 246         }
 247
 248         switch (chain->fw_flg & IPV6_FW_F_COMMAND)
 249         {
 250                 case IPV6_FW_F_ACCEPT:
 251                         printf("allow");
 252                         break;
 253                 case IPV6_FW_F_DENY:
 254                         printf("deny");
 255                         break;
 256                 case IPV6_FW_F_COUNT:
 257                         printf("count");
 258                         break;
 259                 case IPV6_FW_F_DIVERT:
 260                         printf("divert %u", chain->fw_divert_port);
 261                         break;
 262                 case IPV6_FW_F_TEE:
 263                         printf("tee %u", chain->fw_divert_port);
 264                         break;
 265                 case IPV6_FW_F_SKIPTO:
 266                         printf("skipto %u", chain->fw_skipto_rule);
 267                         break;
 268                 case IPV6_FW_F_REJECT:
 269                         if (chain->fw_reject_code == IPV6_FW_REJECT_RST)
 270                                 printf("reset");
 271                         else {
 272                                 printf("unreach ");
 273                                 print_reject_code(chain->fw_reject_code);
 274                         }
 275                         break;
 276                 default:
 277                         errx(EX_OSERR, "impossible");
 278         }
 279
 280         if (chain->fw_flg & IPV6_FW_F_PRN)
 281                 printf(" log");
 282
 283         pe = getprotobynumber(chain->fw_prot);
 284         if (pe)
 285                 printf(" %s", pe->p_name);
 286         else
 287                 printf(" %u", chain->fw_prot);
 288
 289         printf(" from %s", chain->fw_flg & IPV6_FW_F_INVSRC ? "not " : "");
 290
 291         mb=mask_bits((u_char *)&chain->fw_smsk,sizeof(chain->fw_smsk));
 292         if (mb==128 && do_resolv) {
 293                 he=gethostbyaddr((char *)&(chain->fw_src),sizeof(chain->fw_src),AF_INET6);
 294                 if (he==NULL) {
 295                         printf(inet_ntop(AF_INET6,&chain->fw_src,ntop_buf,sizeof(ntop_buf)));
 296                 } else
 297                         printf("%s",he->h_name);
 298         } else {
 299                 if (mb!=128) {
 300                         if (mb == 0) {
 301                                 printf("any");
 302                         } else {
 303                                 printf(inet_ntop(AF_INET6,&chain->fw_src,ntop_buf,sizeof(ntop_buf)));
 304                                 printf("/%d",mb);
 305                         }
 306                 } else
 307                         printf(inet_ntop(AF_INET6,&chain->fw_src,ntop_buf,sizeof(ntop_buf)));
 308         }
 309
 310         if (chain->fw_prot == IPPROTO_TCP || chain->fw_prot == IPPROTO_UDP) {
 311                 comma = " ";
 312                 for (i = 0; i < nsp; i++) {
 313                         print_port(chain->fw_prot, chain->fw_pts[i], comma);
 314                         if (i==0 && (chain->fw_flg & IPV6_FW_F_SRNG))
 315                                 comma = "-";
 316                         else
 317                                 comma = ",";
 318                 }
 319         }
 320
 321         printf(" to %s", chain->fw_flg & IPV6_FW_F_INVDST ? "not " : "");
 322
 323         mb=mask_bits((u_char *)&chain->fw_dmsk,sizeof(chain->fw_dmsk));
 324         if (mb==128 && do_resolv) {
 325                 he=gethostbyaddr((char *)&(chain->fw_dst),sizeof(chain->fw_dst),AF_INET6);
 326                 if (he==NULL) {
 327                         printf(inet_ntop(AF_INET6,&chain->fw_dst,ntop_buf,sizeof(ntop_buf)));
 328                 } else
 329                         printf("%s",he->h_name);
 330         } else {
 331                 if (mb!=128) {
 332                         if (mb == 0) {
 333                                 printf("any");
 334                         } else {
 335                                 printf(inet_ntop(AF_INET6,&chain->fw_dst,ntop_buf,sizeof(ntop_buf)));
 336                                 printf("/%d",mb);
 337                         }
 338                 } else
 339                         printf(inet_ntop(AF_INET6,&chain->fw_dst,ntop_buf,sizeof(ntop_buf)));
 340         }
 341
 342         if (chain->fw_prot == IPPROTO_TCP || chain->fw_prot == IPPROTO_UDP) {
 343                 comma = " ";
 344                 for (i = 0; i < ndp; i++) {
 345                         print_port(chain->fw_prot, chain->fw_pts[nsp+i], comma);
 346                         if (i==0 && (chain->fw_flg & IPV6_FW_F_DRNG))
 347                                 comma = "-";
 348                         else
 349                                 comma = ",";
 350                 }
 351         }
 352
 353         /* Direction */
 354         if ((chain->fw_flg & IPV6_FW_F_IN) && !(chain->fw_flg & IPV6_FW_F_OUT))
 355                 printf(" in");
 356         if (!(chain->fw_flg & IPV6_FW_F_IN) && (chain->fw_flg & IPV6_FW_F_OUT))
 357                 printf(" out");
 358
 359         /* Handle hack for "via" backwards compatibility */
 360         if ((chain->fw_flg & IF6_FW_F_VIAHACK) == IF6_FW_F_VIAHACK) {
 361                 print_iface("via",
 362                     &chain->fw_in_if, chain->fw_flg & IPV6_FW_F_IIFNAME);
 363         } else {
 364                 /* Receive interface specified */
 365                 if (chain->fw_flg & IPV6_FW_F_IIFACE)
 366                         print_iface("recv", &chain->fw_in_if,
 367                             chain->fw_flg & IPV6_FW_F_IIFNAME);
 368                 /* Transmit interface specified */
 369                 if (chain->fw_flg & IPV6_FW_F_OIFACE)
 370                         print_iface("xmit", &chain->fw_out_if,
 371                             chain->fw_flg & IPV6_FW_F_OIFNAME);
 372         }
 373
 374         if (chain->fw_flg & IPV6_FW_F_FRAG)
 375                 printf(" frag");
 376
 377         if (chain->fw_ip6opt || chain->fw_ip6nopt) {
 378                 int     _opt_printed = 0;
 379 #define PRINTOPT(x)     {if (_opt_printed) printf(",");\
 380                         printf(x); _opt_printed = 1;}
 381
 382                 printf(" ip6opt ");
 383                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_HOPOPT) PRINTOPT("hopopt");
 384                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_HOPOPT) PRINTOPT("!hopopt");
 385                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_ROUTE)  PRINTOPT("route");
 386                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_ROUTE)  PRINTOPT("!route");
 387                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_FRAG)  PRINTOPT("frag");
 388                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_FRAG)  PRINTOPT("!frag");
 389                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_ESP)    PRINTOPT("esp");
 390                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_ESP)    PRINTOPT("!esp");
 391                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_AH)     PRINTOPT("ah");
 392                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_AH)     PRINTOPT("!ah");
 393                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_NONXT)  PRINTOPT("nonxt");
 394                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_NONXT)  PRINTOPT("!nonxt");
 395                 if (chain->fw_ip6opt  & IPV6_FW_IP6OPT_OPTS)   PRINTOPT("opts");
 396                 if (chain->fw_ip6nopt & IPV6_FW_IP6OPT_OPTS)   PRINTOPT("!opts");
 397         }
 398
 399         if (chain->fw_ipflg & IPV6_FW_IF_TCPEST)
 400                 printf(" established");
 401         else if (chain->fw_tcpf == IPV6_FW_TCPF_SYN &&
 402             chain->fw_tcpnf == IPV6_FW_TCPF_ACK)
 403                 printf(" setup");
 404         else if (chain->fw_tcpf || chain->fw_tcpnf) {
 405                 int     _flg_printed = 0;
 406 #define PRINTFLG(x)     {if (_flg_printed) printf(",");\
 407                         printf(x); _flg_printed = 1;}
 408
 409                 printf(" tcpflg ");
 410                 if (chain->fw_tcpf  & IPV6_FW_TCPF_FIN)  PRINTFLG("fin");
 411                 if (chain->fw_tcpnf & IPV6_FW_TCPF_FIN)  PRINTFLG("!fin");
 412                 if (chain->fw_tcpf  & IPV6_FW_TCPF_SYN)  PRINTFLG("syn");
 413                 if (chain->fw_tcpnf & IPV6_FW_TCPF_SYN)  PRINTFLG("!syn");
 414                 if (chain->fw_tcpf  & IPV6_FW_TCPF_RST)  PRINTFLG("rst");
 415                 if (chain->fw_tcpnf & IPV6_FW_TCPF_RST)  PRINTFLG("!rst");
 416                 if (chain->fw_tcpf  & IPV6_FW_TCPF_PSH)  PRINTFLG("psh");
 417                 if (chain->fw_tcpnf & IPV6_FW_TCPF_PSH)  PRINTFLG("!psh");
 418                 if (chain->fw_tcpf  & IPV6_FW_TCPF_ACK)  PRINTFLG("ack");
 419                 if (chain->fw_tcpnf & IPV6_FW_TCPF_ACK)  PRINTFLG("!ack");
 420                 if (chain->fw_tcpf  & IPV6_FW_TCPF_URG)  PRINTFLG("urg");
 421                 if (chain->fw_tcpnf & IPV6_FW_TCPF_URG)  PRINTFLG("!urg");
 422         }
 423         if (chain->fw_flg & IPV6_FW_F_ICMPBIT) {
 424                 int type_index;
 425                 int first = 1;
 426
 427                 printf(" icmptype");
 428
 429                 for (type_index = 0; type_index < IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8; ++type_index)
 430                         if (chain->fw_icmp6types[type_index / (sizeof(unsigned) * 8)] &
 431                                 (1U << (type_index % (sizeof(unsigned) * 8)))) {
 432                                 printf("%c%d", first == 1 ? ' ' : ',', type_index);
 433                                 first = 0;
 434                         }
 435         }
 436         printf("\n");
 437         if (do_resolv)
 438                 endservent();
 439 }
 440
 441 void
 442 list(int ac, char **av)
 443 {
 444         struct ip6_fw *r, *rules;
 445         int l,i;
 446         unsigned long rulenum;
 447         int nalloc, bytes, maxbytes;
 448
 449         /* extract rules from kernel, resizing array as necessary */
 450         rules = NULL;
 451         nalloc = sizeof *rules;
 452         bytes = nalloc;
 453         maxbytes = 65536 * sizeof *rules;
 454         while (bytes >= nalloc) {
 455                 nalloc = nalloc * 2 + 200;
 456                 bytes = nalloc;
 457                 if ((rules = realloc(rules, bytes)) == NULL)
 458                         err(EX_OSERR, "realloc");
 459                 i = getsockopt(s, IPPROTO_IPV6, IPV6_FW_GET, rules, &bytes);
 460                 if ((i < 0 && errno != EINVAL) || nalloc > maxbytes)
 461                         err(EX_OSERR, "getsockopt(IPV6_FW_GET)");
 462         }
 463         if (!ac) {
 464                 /* display all rules */
 465                 for (r = rules, l = bytes; l >= sizeof rules[0];
 466                          r++, l-=sizeof rules[0])
 467                         show_ip6fw(r);
 468         }
 469         else {
 470                 /* display specific rules requested on command line */
 471                 int exitval = 0;
 472
 473                 while (ac--) {
 474                         char *endptr;
 475                         int seen;
 476
 477                         /* convert command line rule # */
 478                         rulenum = strtoul(*av++, &endptr, 10);
 479                         if (*endptr) {
 480                                 exitval = 1;
 481                                 warn("invalid rule number: %s", av[-1]);
 482                                 continue;
 483                         }
 484                         seen = 0;
 485                         for (r = rules, l = bytes;
 486                                  l >= sizeof rules[0] && r->fw_number <= rulenum;
 487                                  r++, l-=sizeof rules[0])
 488                                 if (rulenum == r->fw_number) {
 489                                         show_ip6fw(r);
 490                                         seen = 1;
 491                                 }
 492                         if (!seen) {
 493                                 exitval = 1;
 494                                 warnx("rule %lu does not exist", rulenum);
 495                         }
 496                 }
 497                 if (exitval != 0)
 498                         exit(exitval);
 499         }
 500 }
 501
 502 static void
 503 show_usage(const char *fmt, ...)
 504 {
 505         if (fmt) {
 506                 char buf[100];
 507                 va_list args;
 508
 509                 va_start(args, fmt);
 510                 vsnprintf(buf, sizeof(buf), fmt, args);
 511                 va_end(args);
 512                 warnx("error: %s", buf);
 513         }
 514         fprintf(stderr, "usage: ip6fw [options]\n"
 515 "    flush\n"
 516 "    add [number] rule\n"
 517 "    delete number ...\n"
 518 "    list [number ...]\n"
 519 "    show [number ...]\n"
 520 "    zero [number ...]\n"
 521 "  rule:  action proto src dst extras...\n"
 522 "    action:\n"
 523 "      {allow|permit|accept|pass|deny|drop|reject|unreach code|\n"
 524 "       reset|count|skipto num} [log]\n"
 525 "    proto: {ipv6|tcp|udp|ipv6-icmp|<number>}\n"
 526 "    src: from [not] {any|ipv6[/prefixlen]} [{port|port-port},[port],...]\n"
 527 "    dst: to [not] {any|ipv6[/prefixlen]} [{port|port-port},[port],...]\n"
 528 "  extras:\n"
 529 "    fragment     (may not be used with ports or tcpflags)\n"
 530 "    in\n"
 531 "    out\n"
 532 "    {xmit|recv|via} {iface|ipv6|any}\n"
 533 "    {established|setup}\n"
 534 "    tcpflags [!]{syn|fin|rst|ack|psh|urg},...\n"
 535 "    ipv6options [!]{hopopt|route|frag|esp|ah|nonxt|opts},...\n"
 536 "    icmptypes {type[,type]}...\n");
 537
 538         exit(1);
 539 }
 540
 541 static int
 542 lookup_host (char *host, u_char *addr, int family)
 543 {
 544         struct hostent *he;
 545
 546         if (inet_pton(family, host, addr) != 1) {
 547                 if ((he = gethostbyname2(host, family)) == NULL)
 548                         return(-1);
 549                 memcpy(addr, he->h_addr_list[0], he->h_length);
 550         }
 551         return(0);
 552 }
 553
 554 void
 555 fill_ip6(struct in6_addr *ipno, struct in6_addr *mask, int *acp, char ***avp)
 556 {
 557         int ac = *acp;
 558         char **av = *avp;
 559         char *p = 0, md = 0;
 560         int i;
 561
 562         if (ac && !strncmp(*av,"any",strlen(*av))) {
 563                 *ipno = *mask = in6addr_any; av++; ac--;
 564         } else {
 565                 p = strchr(*av, '/');
 566                 if (p) {
 567                         md = *p;
 568                         *p++ = '\0';
 569                 }
 570
 571                 if (lookup_host(*av, ipno, AF_INET6) != 0)
 572                         show_usage("hostname ``%s'' unknown", *av);
 573                 switch (md) {
 574                         case '/':
 575                                 if (atoi(p) == 0) {
 576                                         *mask = in6addr_any;
 577                                 } else if (atoi(p) > 128) {
 578                                         show_usage("bad width ``%s''", p);
 579                                 } else {
 580                                         *mask = *(plen2mask(atoi(p)));
 581                                 }
 582                                 break;
 583                         default:
 584                                 *mask = *(plen2mask(128));
 585                                 break;
 586                 }
 587                 for (i = 0; i < sizeof(*ipno); i++)
 588                         ipno->s6_addr[i] &= mask->s6_addr[i];
 589                 av++;
 590                 ac--;
 591         }
 592         *acp = ac;
 593         *avp = av;
 594 }
 595
 596 static void
 597 fill_reject_code6(u_short *codep, char *str)
 598 {
 599         struct icmpcode *ic;
 600         u_long val;
 601         char *s;
 602
 603         val = strtoul(str, &s, 0);
 604         if (s != str && *s == '\0' && val < 0x100) {
 605                 *codep = val;
 606                 return;
 607         }
 608         for (ic = icmp6codes; ic->str; ic++)
 609                 if (!strcasecmp(str, ic->str)) {
 610                         *codep = ic->code;
 611                         return;
 612                 }
 613         show_usage("unknown ICMP6 unreachable code ``%s''", str);
 614 }
 615
 616 static void
 617 add_port(u_short *cnt, u_short *ptr, u_short off, u_short port)
 618 {
 619         if (off + *cnt >= IPV6_FW_MAX_PORTS)
 620                 errx(1, "too many ports (max is %d)", IPV6_FW_MAX_PORTS);
 621         ptr[off+*cnt] = port;
 622         (*cnt)++;
 623 }
 624
 625 static int
 626 lookup_port(const char *arg, int test, int nodash)
 627 {
 628         int             val;
 629         char            *earg, buf[32];
 630         struct servent  *s;
 631
 632         snprintf(buf, sizeof(buf), "%s", arg);
 633         buf[strcspn(arg, nodash ? "-," : ",")] = 0;
 634         val = (int) strtoul(buf, &earg, 0);
 635         if (!*buf || *earg) {
 636                 setservent(1);
 637                 if ((s = getservbyname(buf, NULL))) {
 638                         val = htons(s->s_port);
 639                 } else {
 640                         if (!test) {
 641                                 errx(1, "unknown port ``%s''", arg);
 642                         }
 643                         val = -1;
 644                 }
 645         } else {
 646                 if (val < 0 || val > 0xffff) {
 647                         if (!test) {
 648                                 errx(1, "port ``%s'' out of range", arg);
 649                         }
 650                         val = -1;
 651                 }
 652         }
 653         return(val);
 654 }
 655
 656 int
 657 fill_port(u_short *cnt, u_short *ptr, u_short off, char *arg)
 658 {
 659         char *s;
 660         int initial_range = 0;
 661
 662         s = arg + strcspn(arg, "-,");   /* first port name can't have a dash */
 663         if (*s == '-') {
 664                 *s++ = '\0';
 665                 if (strchr(arg, ','))
 666                         errx(1, "port range must be first in list");
 667                 add_port(cnt, ptr, off, *arg ? lookup_port(arg, 0, 0) : 0x0000);
 668                 arg = s;
 669                 s = strchr(arg,',');
 670                 if (s)
 671                         *s++ = '\0';
 672                 add_port(cnt, ptr, off, *arg ? lookup_port(arg, 0, 0) : 0xffff);
 673                 arg = s;
 674                 initial_range = 1;
 675         }
 676         while (arg != NULL) {
 677                 s = strchr(arg,',');
 678                 if (s)
 679                         *s++ = '\0';
 680                 add_port(cnt, ptr, off, lookup_port(arg, 0, 0));
 681                 arg = s;
 682         }
 683         return initial_range;
 684 }
 685
 686 void
 687 fill_tcpflag(u_char *set, u_char *reset, char **vp)
 688 {
 689         char *p = *vp,*q;
 690         u_char *d;
 691
 692         while (p && *p) {
 693                 struct tpcflags {
 694                         char * name;
 695                         u_char value;
 696                 } flags[] = {
 697                         { "syn", IPV6_FW_TCPF_SYN },
 698                         { "fin", IPV6_FW_TCPF_FIN },
 699                         { "ack", IPV6_FW_TCPF_ACK },
 700                         { "psh", IPV6_FW_TCPF_PSH },
 701                         { "rst", IPV6_FW_TCPF_RST },
 702                         { "urg", IPV6_FW_TCPF_URG }
 703                 };
 704                 int i;
 705
 706                 if (*p == '!') {
 707                         p++;
 708                         d = reset;
 709                 } else {
 710                         d = set;
 711                 }
 712                 q = strchr(p, ',');
 713                 if (q)
 714                         *q++ = '\0';
 715                 for (i = 0; i < sizeof(flags) / sizeof(flags[0]); ++i)
 716                         if (!strncmp(p, flags[i].name, strlen(p))) {
 717                                 *d |= flags[i].value;
 718                                 break;
 719                         }
 720                 if (i == sizeof(flags) / sizeof(flags[0]))
 721                         show_usage("invalid tcp flag ``%s''", p);
 722                 p = q;
 723         }
 724 }
 725
 726 static void
 727 fill_ip6opt(u_char *set, u_char *reset, char **vp)
 728 {
 729         char *p = *vp,*q;
 730         u_char *d;
 731
 732         while (p && *p) {
 733                 if (*p == '!') {
 734                         p++;
 735                         d = reset;
 736                 } else {
 737                         d = set;
 738                 }
 739                 q = strchr(p, ',');
 740                 if (q)
 741                         *q++ = '\0';
 742                 if (!strncmp(p,"hopopt",strlen(p))) *d |= IPV6_FW_IP6OPT_HOPOPT;
 743                 if (!strncmp(p,"route",strlen(p)))  *d |= IPV6_FW_IP6OPT_ROUTE;
 744                 if (!strncmp(p,"frag",strlen(p)))   *d |= IPV6_FW_IP6OPT_FRAG;
 745                 if (!strncmp(p,"esp",strlen(p)))    *d |= IPV6_FW_IP6OPT_ESP;
 746                 if (!strncmp(p,"ah",strlen(p)))     *d |= IPV6_FW_IP6OPT_AH;
 747                 if (!strncmp(p,"nonxt",strlen(p)))  *d |= IPV6_FW_IP6OPT_NONXT;
 748                 if (!strncmp(p,"opts",strlen(p)))   *d |= IPV6_FW_IP6OPT_OPTS;
 749                 p = q;
 750         }
 751 }
 752
 753 void
 754 fill_icmptypes(u_long *types, char **vp, u_short *fw_flg)
 755 {
 756         char *c = *vp;
 757
 758         while (*c)
 759         {
 760                 unsigned long icmptype;
 761
 762                 if ( *c == ',' )
 763                         ++c;
 764
 765                 icmptype = strtoul(c, &c, 0);
 766
 767                 if ( *c != ',' && *c != '\0' )
 768                         show_usage("invalid ICMP6 type");
 769
 770                 if (icmptype >= IPV6_FW_ICMPTYPES_DIM * sizeof(unsigned) * 8)
 771                         show_usage("ICMP6 type out of range");
 772
 773                 types[icmptype / (sizeof(unsigned) * 8)] |=
 774                         1 << (icmptype % (sizeof(unsigned) * 8));
 775                 *fw_flg |= IPV6_FW_F_ICMPBIT;
 776         }
 777 }
 778
 779 void
 780 delete(int ac, char **av)
 781 {
 782         struct ip6_fw rule;
 783         int i;
 784         int exitval = 0;
 785
 786         memset(&rule, 0, sizeof rule);
 787
 788         av++; ac--;
 789
 790         /* Rule number */
 791         while (ac && isdigit(**av)) {
 792                 rule.fw_number = atoi(*av); av++; ac--;
 793                 i = setsockopt(s, IPPROTO_IPV6, IPV6_FW_DEL, &rule, sizeof rule);
 794                 if (i) {
 795                         exitval = 1;
 796                         warn("rule %u: setsockopt(%s)", rule.fw_number, "IPV6_FW_DEL");
 797                 }
 798         }
 799         if (exitval != 0)
 800                 exit(exitval);
 801 }
 802
 803 static void
 804 verify_interface(union ip6_fw_if *ifu)
 805 {
 806         struct ifreq ifr;
 807
 808         /*
 809          *      If a unit was specified, check for that exact interface.
 810          *      If a wildcard was specified, check for unit 0.
 811          */
 812         snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d",
 813                          ifu->fu_via_if.name,
 814                          ifu->fu_via_if.unit == -1 ? 0 : ifu->fu_via_if.unit);
 815
 816         if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0)
 817                 warnx("warning: interface ``%s'' does not exist", ifr.ifr_name);
 818 }
 819
 820 static void
 821 fill_iface(char *which, union ip6_fw_if *ifu, int *byname, int ac, char *arg)
 822 {
 823         if (!ac)
 824             show_usage("missing argument for ``%s''", which);
 825
 826         /* Parse the interface or address */
 827         if (!strcmp(arg, "any")) {
 828                 ifu->fu_via_ip6 = in6addr_any;
 829                 *byname = 0;
 830         } else if (!isdigit(*arg)) {
 831                 char *q;
 832
 833                 *byname = 1;
 834                 strncpy(ifu->fu_via_if.name, arg, sizeof(ifu->fu_via_if.name));
 835                 ifu->fu_via_if.name[sizeof(ifu->fu_via_if.name) - 1] = '\0';
 836                 for (q = ifu->fu_via_if.name;
 837                     *q && !isdigit(*q) && *q != '*'; q++)
 838                         continue;
 839                 ifu->fu_via_if.unit = (*q == '*') ? -1 : atoi(q);
 840                 *q = '\0';
 841                 verify_interface(ifu);
 842         } else if (inet_pton(AF_INET6, arg, &ifu->fu_via_ip6) != 1) {
 843                 show_usage("bad ip6 address ``%s''", arg);
 844         } else
 845                 *byname = 0;
 846 }
 847
 848 static void
 849 add(int ac, char **av)
 850 {
 851         struct ip6_fw rule;
 852         int i;
 853         u_char proto;
 854         struct protoent *pe;
 855         int saw_xmrc = 0, saw_via = 0;
 856
 857         memset(&rule, 0, sizeof rule);
 858
 859         av++; ac--;
 860
 861         /* Rule number */
 862         if (ac && isdigit(**av)) {
 863                 rule.fw_number = atoi(*av); av++; ac--;
 864         }
 865
 866         /* Action */
 867         if (ac == 0)
 868                 show_usage("missing action");
 869         if (!strncmp(*av,"accept",strlen(*av))
 870                     || !strncmp(*av,"pass",strlen(*av))
 871                     || !strncmp(*av,"allow",strlen(*av))
 872                     || !strncmp(*av,"permit",strlen(*av))) {
 873                 rule.fw_flg |= IPV6_FW_F_ACCEPT; av++; ac--;
 874         } else if (!strncmp(*av,"count",strlen(*av))) {
 875                 rule.fw_flg |= IPV6_FW_F_COUNT; av++; ac--;
 876         }
 877 #if 0
 878         else if (!strncmp(*av,"divert",strlen(*av))) {
 879                 rule.fw_flg |= IPV6_FW_F_DIVERT; av++; ac--;
 880                 if (!ac)
 881                         show_usage("missing divert port");
 882                 rule.fw_divert_port = strtoul(*av, NULL, 0); av++; ac--;
 883                 if (rule.fw_divert_port == 0) {
 884                         struct servent *s;
 885                         setservent(1);
 886                         s = getservbyname(av[-1], "divert");
 887                         if (s != NULL)
 888                                 rule.fw_divert_port = ntohs(s->s_port);
 889                         else
 890                                 show_usage("illegal divert port");
 891                 }
 892         } else if (!strncmp(*av,"tee",strlen(*av))) {
 893                 rule.fw_flg |= IPV6_FW_F_TEE; av++; ac--;
 894                 if (!ac)
 895                         show_usage("missing divert port");
 896                 rule.fw_divert_port = strtoul(*av, NULL, 0); av++; ac--;
 897                 if (rule.fw_divert_port == 0) {
 898                         struct servent *s;
 899                         setservent(1);
 900                         s = getservbyname(av[-1], "divert");
 901                         if (s != NULL)
 902                                 rule.fw_divert_port = ntohs(s->s_port);
 903                         else
 904                                 show_usage("illegal divert port");
 905                 }
 906         }
 907 #endif
 908         else if (!strncmp(*av,"skipto",strlen(*av))) {
 909                 rule.fw_flg |= IPV6_FW_F_SKIPTO; av++; ac--;
 910                 if (!ac)
 911                         show_usage("missing skipto rule number");
 912                 rule.fw_skipto_rule = strtoul(*av, NULL, 0); av++; ac--;
 913         } else if ((!strncmp(*av,"deny",strlen(*av))
 914                     || !strncmp(*av,"drop",strlen(*av)))) {
 915                 rule.fw_flg |= IPV6_FW_F_DENY; av++; ac--;
 916         } else if (!strncmp(*av,"reject",strlen(*av))) {
 917                 rule.fw_flg |= IPV6_FW_F_REJECT; av++; ac--;
 918                 rule.fw_reject_code = ICMP6_DST_UNREACH_NOROUTE;
 919         } else if (!strncmp(*av,"reset",strlen(*av))) {
 920                 rule.fw_flg |= IPV6_FW_F_REJECT; av++; ac--;
 921                 rule.fw_reject_code = IPV6_FW_REJECT_RST;       /* check TCP later */
 922         } else if (!strncmp(*av,"unreach",strlen(*av))) {
 923                 rule.fw_flg |= IPV6_FW_F_REJECT; av++; ac--;
 924                 fill_reject_code6(&rule.fw_reject_code, *av); av++; ac--;
 925         } else {
 926                 show_usage("invalid action ``%s''", *av);
 927         }
 928
 929         /* [log] */
 930         if (ac && !strncmp(*av,"log",strlen(*av))) {
 931                 rule.fw_flg |= IPV6_FW_F_PRN; av++; ac--;
 932         }
 933
 934         /* protocol */
 935         if (ac == 0)
 936                 show_usage("missing protocol");
 937         if ((proto = atoi(*av)) > 0) {
 938                 rule.fw_prot = proto; av++; ac--;
 939         } else if (!strncmp(*av,"all",strlen(*av))) {
 940                 rule.fw_prot = IPPROTO_IPV6; av++; ac--;
 941         } else if ((pe = getprotobyname(*av)) != NULL) {
 942                 rule.fw_prot = pe->p_proto; av++; ac--;
 943         } else {
 944                 show_usage("invalid protocol ``%s''", *av);
 945         }
 946
 947         if (rule.fw_prot != IPPROTO_TCP
 948             && (rule.fw_flg & IPV6_FW_F_COMMAND) == IPV6_FW_F_REJECT
 949             && rule.fw_reject_code == IPV6_FW_REJECT_RST)
 950                 show_usage("``reset'' is only valid for tcp packets");
 951
 952         /* from */
 953         if (ac && !strncmp(*av,"from",strlen(*av))) { av++; ac--; }
 954         else
 955                 show_usage("missing ``from''");
 956
 957         if (ac && !strncmp(*av,"not",strlen(*av))) {
 958                 rule.fw_flg |= IPV6_FW_F_INVSRC;
 959                 av++; ac--;
 960         }
 961         if (!ac)
 962                 show_usage("missing arguments");
 963
 964         fill_ip6(&rule.fw_src, &rule.fw_smsk, &ac, &av);
 965
 966         if (ac && (isdigit(**av) || lookup_port(*av, 1, 1) >= 0)) {
 967                 u_short nports = 0;
 968
 969                 if (fill_port(&nports, rule.fw_pts, 0, *av))
 970                         rule.fw_flg |= IPV6_FW_F_SRNG;
 971                 IPV6_FW_SETNSRCP(&rule, nports);
 972                 av++; ac--;
 973         }
 974
 975         /* to */
 976         if (ac && !strncmp(*av,"to",strlen(*av))) { av++; ac--; }
 977         else
 978                 show_usage("missing ``to''");
 979
 980         if (ac && !strncmp(*av,"not",strlen(*av))) {
 981                 rule.fw_flg |= IPV6_FW_F_INVDST;
 982                 av++; ac--;
 983         }
 984         if (!ac)
 985                 show_usage("missing arguments");
 986
 987         fill_ip6(&rule.fw_dst, &rule.fw_dmsk, &ac, &av);
 988
 989         if (ac && (isdigit(**av) || lookup_port(*av, 1, 1) >= 0)) {
 990                 u_short nports = 0;
 991
 992                 if (fill_port(&nports,
 993                     rule.fw_pts, IPV6_FW_GETNSRCP(&rule), *av))
 994                         rule.fw_flg |= IPV6_FW_F_DRNG;
 995                 IPV6_FW_SETNDSTP(&rule, nports);
 996                 av++; ac--;
 997         }
 998
 999         if ((rule.fw_prot != IPPROTO_TCP) && (rule.fw_prot != IPPROTO_UDP)
1000             && (IPV6_FW_GETNSRCP(&rule) || IPV6_FW_GETNDSTP(&rule))) {
1001                 show_usage("only TCP and UDP protocols are valid"
1002                     " with port specifications");
1003         }
1004
1005         while (ac) {
1006                 if (!strncmp(*av,"in",strlen(*av))) {
1007                         rule.fw_flg |= IPV6_FW_F_IN;
1008                         av++; ac--; continue;
1009                 }
1010                 if (!strncmp(*av,"out",strlen(*av))) {
1011                         rule.fw_flg |= IPV6_FW_F_OUT;
1012                         av++; ac--; continue;
1013                 }
1014                 if (ac && !strncmp(*av,"xmit",strlen(*av))) {
1015                         union ip6_fw_if ifu;
1016                         int byname;
1017
1018                         if (saw_via) {
1019 badviacombo:
1020                                 show_usage("``via'' is incompatible"
1021                                     " with ``xmit'' and ``recv''");
1022                         }
1023                         saw_xmrc = 1;
1024                         av++; ac--;
1025                         fill_iface("xmit", &ifu, &byname, ac, *av);
1026                         rule.fw_out_if = ifu;
1027                         rule.fw_flg |= IPV6_FW_F_OIFACE;
1028                         if (byname)
1029                                 rule.fw_flg |= IPV6_FW_F_OIFNAME;
1030                         av++; ac--; continue;
1031                 }
1032                 if (ac && !strncmp(*av,"recv",strlen(*av))) {
1033                         union ip6_fw_if ifu;
1034                         int byname;
1035
1036                         if (saw_via)
1037                                 goto badviacombo;
1038                         saw_xmrc = 1;
1039                         av++; ac--;
1040                         fill_iface("recv", &ifu, &byname, ac, *av);
1041                         rule.fw_in_if = ifu;
1042                         rule.fw_flg |= IPV6_FW_F_IIFACE;
1043                         if (byname)
1044                                 rule.fw_flg |= IPV6_FW_F_IIFNAME;
1045                         av++; ac--; continue;
1046                 }
1047                 if (ac && !strncmp(*av,"via",strlen(*av))) {
1048                         union ip6_fw_if ifu;
1049                         int byname = 0;
1050
1051                         if (saw_xmrc)
1052                                 goto badviacombo;
1053                         saw_via = 1;
1054                         av++; ac--;
1055                         fill_iface("via", &ifu, &byname, ac, *av);
1056                         rule.fw_out_if = rule.fw_in_if = ifu;
1057                         if (byname)
1058                                 rule.fw_flg |=
1059                                     (IPV6_FW_F_IIFNAME | IPV6_FW_F_OIFNAME);
1060                         av++; ac--; continue;
1061                 }
1062                 if (!strncmp(*av,"fragment",strlen(*av))) {
1063                         rule.fw_flg |= IPV6_FW_F_FRAG;
1064                         av++; ac--; continue;
1065                 }
1066                 if (!strncmp(*av,"ipv6options",strlen(*av))) {
1067                         av++; ac--;
1068                         if (!ac)
1069                                 show_usage("missing argument"
1070                                     " for ``ipv6options''");
1071                         fill_ip6opt(&rule.fw_ip6opt, &rule.fw_ip6nopt, av);
1072                         av++; ac--; continue;
1073                 }
1074                 if (rule.fw_prot == IPPROTO_TCP) {
1075                         if (!strncmp(*av,"established",strlen(*av))) {
1076                                 rule.fw_ipflg |= IPV6_FW_IF_TCPEST;
1077                                 av++; ac--; continue;
1078                         }
1079                         if (!strncmp(*av,"setup",strlen(*av))) {
1080                                 rule.fw_tcpf  |= IPV6_FW_TCPF_SYN;
1081                                 rule.fw_tcpnf  |= IPV6_FW_TCPF_ACK;
1082                                 av++; ac--; continue;
1083                         }
1084                         if (!strncmp(*av,"tcpflags",strlen(*av))) {
1085                                 av++; ac--;
1086                                 if (!ac)
1087                                         show_usage("missing argument"
1088                                             " for ``tcpflags''");
1089                                 fill_tcpflag(&rule.fw_tcpf, &rule.fw_tcpnf, av);
1090                                 av++; ac--; continue;
1091                         }
1092                 }
1093                 if (rule.fw_prot == IPPROTO_ICMPV6) {
1094                         if (!strncmp(*av,"icmptypes",strlen(*av))) {
1095                                 av++; ac--;
1096                                 if (!ac)
1097                                         show_usage("missing argument"
1098                                             " for ``icmptypes''");
1099                                 fill_icmptypes(rule.fw_icmp6types,
1100                                     av, &rule.fw_flg);
1101                                 av++; ac--; continue;
1102                         }
1103                 }
1104                 show_usage("unknown argument ``%s''", *av);
1105         }
1106
1107         /* No direction specified -> do both directions */
1108         if (!(rule.fw_flg & (IPV6_FW_F_OUT|IPV6_FW_F_IN)))
1109                 rule.fw_flg |= (IPV6_FW_F_OUT|IPV6_FW_F_IN);
1110
1111         /* Sanity check interface check, but handle "via" case separately */
1112         if (saw_via) {
1113                 if (rule.fw_flg & IPV6_FW_F_IN)
1114                         rule.fw_flg |= IPV6_FW_F_IIFACE;
1115                 if (rule.fw_flg & IPV6_FW_F_OUT)
1116                         rule.fw_flg |= IPV6_FW_F_OIFACE;
1117         } else if ((rule.fw_flg & IPV6_FW_F_OIFACE) && (rule.fw_flg & IPV6_FW_F_IN))
1118                 show_usage("can't check xmit interface of incoming packets");
1119
1120         /* frag may not be used in conjunction with ports or TCP flags */
1121         if (rule.fw_flg & IPV6_FW_F_FRAG) {
1122                 if (rule.fw_tcpf || rule.fw_tcpnf)
1123                         show_usage("can't mix 'frag' and tcpflags");
1124
1125                 if (rule.fw_nports)
1126                         show_usage("can't mix 'frag' and port specifications");
1127         }
1128
1129         if (!do_quiet)
1130                 show_ip6fw(&rule);
1131         i = setsockopt(s, IPPROTO_IPV6, IPV6_FW_ADD, &rule, sizeof rule);
1132         if (i)
1133                 err(EX_UNAVAILABLE, "setsockopt(%s)", "IPV6_FW_ADD");
1134 }
1135
1136 static void
1137 zero (int ac, char **av)
1138 {
1139         av++; ac--;
1140
1141         if (!ac) {
1142                 /* clear all entries */
1143                 if (setsockopt(s,IPPROTO_IPV6,IPV6_FW_ZERO,NULL,0)<0)
1144                         err(EX_UNAVAILABLE, "setsockopt(%s)", "IPV6_FW_ZERO");
1145                 if (!do_quiet)
1146                         printf("Accounting cleared.\n");
1147         } else {
1148                 struct ip6_fw rule;
1149                 int failed = 0;
1150
1151                 memset(&rule, 0, sizeof rule);
1152                 while (ac) {
1153                         /* Rule number */
1154                         if (isdigit(**av)) {
1155                                 rule.fw_number = atoi(*av); av++; ac--;
1156                                 if (setsockopt(s, IPPROTO_IPV6,
1157                                     IPV6_FW_ZERO, &rule, sizeof rule)) {
1158                                         warn("rule %u: setsockopt(%s)", rule.fw_number,
1159                                                  "IPV6_FW_ZERO");
1160                                         failed = 1;
1161                                 }
1162                                 else if (!do_quiet)
1163                                         printf("Entry %d cleared\n",
1164                                             rule.fw_number);
1165                         } else
1166                                 show_usage("invalid rule number ``%s''", *av);
1167                 }
1168                 if (failed != 0)
1169                         exit(failed);
1170         }
1171 }
1172
1173 int
1174 ip6fw_main(int ac, char **av)
1175 {
1176         int             ch;
1177         extern int      optind;
1178
1179         /* init optind to 1 */
1180         optind = 1;
1181
1182         if ( ac == 1 ) {
1183                 show_usage(NULL);
1184         }
1185
1186         /* Set the force flag for non-interactive processes */
1187         do_force = !isatty(STDIN_FILENO);
1188
1189         while ((ch = getopt(ac, av ,"afqtN")) != -1)
1190         switch(ch) {
1191                 case 'a':
1192                         do_acct=1;
1193                         break;
1194                 case 'f':
1195                         do_force=1;
1196                         break;
1197                 case 'q':
1198                         do_quiet=1;
1199                         break;
1200                 case 't':
1201                         do_time=1;
1202                         break;
1203                 case 'N':
1204                         do_resolv=1;
1205                         break;
1206                 default:
1207                         show_usage(NULL);
1208         }
1209
1210         ac -= optind;
1211         if (*(av+=optind)==NULL) {
1212                  show_usage("Bad arguments");
1213         }
1214
1215         if (!strncmp(*av, "add", strlen(*av))) {
1216                 add(ac,av);
1217         } else if (!strncmp(*av, "delete", strlen(*av))) {
1218                 delete(ac,av);
1219         } else if (!strncmp(*av, "flush", strlen(*av))) {
1220                 int do_flush = 0;
1221
1222                 if ( do_force || do_quiet )
1223                         do_flush = 1;
1224                 else {
1225                         int c;
1226
1227                         /* Ask the user */
1228                         printf("Are you sure? [yn] ");
1229                         do {
1230                                 fflush(stdout);
1231                                 c = toupper(getc(stdin));
1232                                 while (c != '\n' && getc(stdin) != '\n')
1233                                         if (feof(stdin))
1234                                                 return (0);
1235                         } while (c != 'Y' && c != 'N');
1236                         printf("\n");
1237                         if (c == 'Y')
1238                                 do_flush = 1;
1239                 }
1240                 if ( do_flush ) {
1241                         if (setsockopt(s,IPPROTO_IPV6,IPV6_FW_FLUSH,NULL,0) < 0)
1242                                 err(EX_UNAVAILABLE, "setsockopt(%s)", "IPV6_FW_FLUSH");
1243                         if (!do_quiet)
1244                                 printf("Flushed all rules.\n");
1245                 }
1246         } else if (!strncmp(*av, "zero", strlen(*av))) {
1247                 zero(ac,av);
1248         } else if (!strncmp(*av, "print", strlen(*av))) {
1249                 list(--ac,++av);
1250         } else if (!strncmp(*av, "list", strlen(*av))) {
1251                 list(--ac,++av);
1252         } else if (!strncmp(*av, "show", strlen(*av))) {
1253                 do_acct++;
1254                 list(--ac,++av);
1255         } else {
1256                 show_usage("Bad arguments");
1257         }
1258         return 0;
1259 }
1260
1261 int
1262 main(int ac, char **av)
1263 {
1264 #define MAX_ARGS        32
1265 #define WHITESP         " \t\f\v\n\r"
1266         char    buf[BUFSIZ];
1267         char    *a, *p, *args[MAX_ARGS], *cmd = NULL;
1268         char    linename[10];
1269         int     i, c, lineno, qflag, pflag, status;
1270         FILE    *f = NULL;
1271         pid_t   preproc = 0;
1272
1273         s = socket( AF_INET6, SOCK_RAW, IPPROTO_RAW );
1274         if ( s < 0 )
1275                 err(EX_UNAVAILABLE, "socket");
1276
1277         setbuf(stdout,0);
1278
1279         /*
1280          * Only interpret the last command line argument as a file to
1281          * be preprocessed if it is specified as an absolute pathname.
1282          */
1283
1284         if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0) {
1285                 qflag = pflag = i = 0;
1286                 lineno = 0;
1287
1288                 while ((c = getopt(ac, av, "D:U:p:q")) != -1)
1289                         switch(c) {
1290                         case 'D':
1291                                 if (!pflag)
1292                                         errx(EX_USAGE, "-D requires -p");
1293                                 if (i > MAX_ARGS - 2)
1294                                         errx(EX_USAGE,
1295                                              "too many -D or -U options");
1296                                 args[i++] = "-D";
1297                                 args[i++] = optarg;
1298                                 break;
1299
1300                         case 'U':
1301                                 if (!pflag)
1302                                         errx(EX_USAGE, "-U requires -p");
1303                                 if (i > MAX_ARGS - 2)
1304                                         errx(EX_USAGE,
1305                                              "too many -D or -U options");
1306                                 args[i++] = "-U";
1307                                 args[i++] = optarg;
1308                                 break;
1309
1310                         case 'p':
1311                                 pflag = 1;
1312                                 cmd = optarg;
1313                                 args[0] = cmd;
1314                                 i = 1;
1315                                 break;
1316
1317                         case 'q':
1318                                 qflag = 1;
1319                                 break;
1320
1321                         default:
1322                                 show_usage(NULL);
1323                         }
1324
1325                 av += optind;
1326                 ac -= optind;
1327                 if (ac != 1)
1328                         show_usage("extraneous filename arguments");
1329
1330                 if ((f = fopen(av[0], "r")) == NULL)
1331                         err(EX_UNAVAILABLE, "fopen: %s", av[0]);
1332
1333                 if (pflag) {
1334                         /* pipe through preprocessor (cpp or m4) */
1335                         int pipedes[2];
1336
1337                         args[i] = 0;
1338
1339                         if (pipe(pipedes) == -1)
1340                                 err(EX_OSERR, "cannot create pipe");
1341
1342                         switch((preproc = fork())) {
1343                         case -1:
1344                                 err(EX_OSERR, "cannot fork");
1345
1346                         case 0:
1347                                 /* child */
1348                                 if (dup2(fileno(f), 0) == -1 ||
1349                                     dup2(pipedes[1], 1) == -1)
1350                                         err(EX_OSERR, "dup2()");
1351                                 fclose(f);
1352                                 close(pipedes[1]);
1353                                 close(pipedes[0]);
1354                                 execvp(cmd, args);
1355                                 err(EX_OSERR, "execvp(%s) failed", cmd);
1356
1357                         default:
1358                                 /* parent */
1359                                 fclose(f);
1360                                 close(pipedes[1]);
1361                                 if ((f = fdopen(pipedes[0], "r")) == NULL) {
1362                                         int savederrno = errno;
1363
1364                                         (void)kill(preproc, SIGTERM);
1365                                         errno = savederrno;
1366                                         err(EX_OSERR, "fdopen()");
1367                                 }
1368                         }
1369                 }
1370
1371                 while (fgets(buf, BUFSIZ, f)) {
1372                         lineno++;
1373                         sprintf(linename, "Line %d", lineno);
1374                         args[0] = linename;
1375
1376                         if (*buf == '#')
1377                                 continue;
1378                         if ((p = strchr(buf, '#')) != NULL)
1379                                 *p = '\0';
1380                         i=1;
1381                         if (qflag) args[i++]="-q";
1382                         for (a = strtok(buf, WHITESP);
1383                             a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
1384                                 args[i] = a;
1385                         if (i == (qflag? 2: 1))
1386                                 continue;
1387                         if (i == MAX_ARGS)
1388                                 errx(EX_USAGE, "%s: too many arguments", linename);
1389                         args[i] = NULL;
1390
1391                         ip6fw_main(i, args);
1392                 }
1393                 fclose(f);
1394                 if (pflag) {
1395                         if (waitpid(preproc, &status, 0) != -1) {
1396                                 if (WIFEXITED(status)) {
1397                                         if (WEXITSTATUS(status) != EX_OK)
1398                                                 errx(EX_UNAVAILABLE,
1399                                                      "preprocessor exited with status %d",
1400                                                      WEXITSTATUS(status));
1401                                 } else if (WIFSIGNALED(status)) {
1402                                         errx(EX_UNAVAILABLE,
1403                                              "preprocessor exited with signal %d",
1404                                              WTERMSIG(status));
1405                                 }
1406                         }
1407                 }
1408         } else
1409                 ip6fw_main(ac,av);
1410         return 0;
1411 }