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pfctl_parser.c

/*    $OpenBSD: pfctl_parser.c,v 1.234 2006/10/31 23:46:24 mcbride Exp $ */

/*
 * Copyright (c) 2001 Daniel Hartmeier
 * Copyright (c) 2002,2003 Henning Brauer
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *    - Redistributions of source code must retain the above copyright
 *      notice, this list of conditions and the following disclaimer.
 *    - Redistributions in binary form must reproduce the above
 *      copyright notice, this list of conditions and the following
 *      disclaimer in the documentation and/or other materials provided
 *      with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/contrib/pf/pfctl/pfctl_parser.c,v 1.8.6.1 2008/11/25 02:59:29 kensmith Exp $");

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/param.h>
#include <sys/proc.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#include <netinet/icmp6.h>
#include <net/pfvar.h>
#include <arpa/inet.h>

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <netdb.h>
#include <stdarg.h>
#include <errno.h>
#include <err.h>
#include <ifaddrs.h>
#include <unistd.h>

#include "pfctl_parser.h"
#include "pfctl.h"

void         print_op (u_int8_t, const char *, const char *);
void         print_port (u_int8_t, u_int16_t, u_int16_t, const char *);
void         print_ugid (u_int8_t, unsigned, unsigned, const char *, unsigned);
void         print_flags (u_int8_t);
void         print_fromto(struct pf_rule_addr *, pf_osfp_t,
                struct pf_rule_addr *, u_int8_t, u_int8_t, int);
int          ifa_skip_if(const char *filter, struct node_host *p);

struct node_host  *ifa_grouplookup(const char *, int);
struct node_host  *host_if(const char *, int);
struct node_host  *host_v4(const char *, int);
struct node_host  *host_v6(const char *, int);
struct node_host  *host_dns(const char *, int, int);

const char *tcpflags = "FSRPAUEW";

static const struct icmptypeent icmp_type[] = {
      { "echoreq",      ICMP_ECHO },
      { "echorep",      ICMP_ECHOREPLY },
      { "unreach",      ICMP_UNREACH },
      { "squench",      ICMP_SOURCEQUENCH },
      { "redir",  ICMP_REDIRECT },
      { "althost",      ICMP_ALTHOSTADDR },
      { "routeradv",    ICMP_ROUTERADVERT },
      { "routersol",    ICMP_ROUTERSOLICIT },
      { "timex",  ICMP_TIMXCEED },
      { "paramprob",    ICMP_PARAMPROB },
      { "timereq",      ICMP_TSTAMP },
      { "timerep",      ICMP_TSTAMPREPLY },
      { "inforeq",      ICMP_IREQ },
      { "inforep",      ICMP_IREQREPLY },
      { "maskreq",      ICMP_MASKREQ },
      { "maskrep",      ICMP_MASKREPLY },
      { "trace",  ICMP_TRACEROUTE },
      { "dataconv",     ICMP_DATACONVERR },
      { "mobredir",     ICMP_MOBILE_REDIRECT },
      { "ipv6-where",   ICMP_IPV6_WHEREAREYOU },
      { "ipv6-here",    ICMP_IPV6_IAMHERE },
      { "mobregreq",    ICMP_MOBILE_REGREQUEST },
      { "mobregrep",    ICMP_MOBILE_REGREPLY },
      { "skip",   ICMP_SKIP },
      { "photuris",     ICMP_PHOTURIS }
};

static const struct icmptypeent icmp6_type[] = {
      { "unreach",      ICMP6_DST_UNREACH },
      { "toobig", ICMP6_PACKET_TOO_BIG },
      { "timex",  ICMP6_TIME_EXCEEDED },
      { "paramprob",    ICMP6_PARAM_PROB },
      { "echoreq",      ICMP6_ECHO_REQUEST },
      { "echorep",      ICMP6_ECHO_REPLY },
      { "groupqry",     ICMP6_MEMBERSHIP_QUERY },
      { "listqry",      MLD_LISTENER_QUERY },
      { "grouprep",     ICMP6_MEMBERSHIP_REPORT },
      { "listenrep",    MLD_LISTENER_REPORT },
      { "groupterm",    ICMP6_MEMBERSHIP_REDUCTION },
      { "listendone", MLD_LISTENER_DONE },
      { "routersol",    ND_ROUTER_SOLICIT },
      { "routeradv",    ND_ROUTER_ADVERT },
      { "neighbrsol", ND_NEIGHBOR_SOLICIT },
      { "neighbradv", ND_NEIGHBOR_ADVERT },
      { "redir",  ND_REDIRECT },
      { "routrrenum", ICMP6_ROUTER_RENUMBERING },
      { "wrureq", ICMP6_WRUREQUEST },
      { "wrurep", ICMP6_WRUREPLY },
      { "fqdnreq",      ICMP6_FQDN_QUERY },
      { "fqdnrep",      ICMP6_FQDN_REPLY },
      { "niqry",  ICMP6_NI_QUERY },
      { "nirep",  ICMP6_NI_REPLY },
      { "mtraceresp",   MLD_MTRACE_RESP },
      { "mtrace", MLD_MTRACE }
};

static const struct icmpcodeent icmp_code[] = {
      { "net-unr",            ICMP_UNREACH,     ICMP_UNREACH_NET },
      { "host-unr",           ICMP_UNREACH,     ICMP_UNREACH_HOST },
      { "proto-unr",          ICMP_UNREACH,     ICMP_UNREACH_PROTOCOL },
      { "port-unr",           ICMP_UNREACH,     ICMP_UNREACH_PORT },
      { "needfrag",           ICMP_UNREACH,     ICMP_UNREACH_NEEDFRAG },
      { "srcfail",            ICMP_UNREACH,     ICMP_UNREACH_SRCFAIL },
      { "net-unk",            ICMP_UNREACH,     ICMP_UNREACH_NET_UNKNOWN },
      { "host-unk",           ICMP_UNREACH,     ICMP_UNREACH_HOST_UNKNOWN },
      { "isolate",            ICMP_UNREACH,     ICMP_UNREACH_ISOLATED },
      { "net-prohib",         ICMP_UNREACH,     ICMP_UNREACH_NET_PROHIB },
      { "host-prohib",  ICMP_UNREACH,     ICMP_UNREACH_HOST_PROHIB },
      { "net-tos",            ICMP_UNREACH,     ICMP_UNREACH_TOSNET },
      { "host-tos",           ICMP_UNREACH,     ICMP_UNREACH_TOSHOST },
      { "filter-prohib",      ICMP_UNREACH,     ICMP_UNREACH_FILTER_PROHIB },
      { "host-preced",  ICMP_UNREACH,     ICMP_UNREACH_HOST_PRECEDENCE },
      { "cutoff-preced",      ICMP_UNREACH,     ICMP_UNREACH_PRECEDENCE_CUTOFF },
      { "redir-net",          ICMP_REDIRECT,    ICMP_REDIRECT_NET },
      { "redir-host",         ICMP_REDIRECT,    ICMP_REDIRECT_HOST },
      { "redir-tos-net",      ICMP_REDIRECT,    ICMP_REDIRECT_TOSNET },
      { "redir-tos-host",     ICMP_REDIRECT,    ICMP_REDIRECT_TOSHOST },
      { "normal-adv",         ICMP_ROUTERADVERT, ICMP_ROUTERADVERT_NORMAL },
      { "common-adv",         ICMP_ROUTERADVERT, ICMP_ROUTERADVERT_NOROUTE_COMMON },
      { "transit",            ICMP_TIMXCEED,    ICMP_TIMXCEED_INTRANS },
      { "reassemb",           ICMP_TIMXCEED,    ICMP_TIMXCEED_REASS },
      { "badhead",            ICMP_PARAMPROB,   ICMP_PARAMPROB_ERRATPTR },
      { "optmiss",            ICMP_PARAMPROB,   ICMP_PARAMPROB_OPTABSENT },
      { "badlen",       ICMP_PARAMPROB,   ICMP_PARAMPROB_LENGTH },
      { "unknown-ind",  ICMP_PHOTURIS,    ICMP_PHOTURIS_UNKNOWN_INDEX },
      { "auth-fail",          ICMP_PHOTURIS,    ICMP_PHOTURIS_AUTH_FAILED },
      { "decrypt-fail", ICMP_PHOTURIS,    ICMP_PHOTURIS_DECRYPT_FAILED }
};

static const struct icmpcodeent icmp6_code[] = {
      { "admin-unr", ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADMIN },
      { "noroute-unr", ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOROUTE },
      { "notnbr-unr",   ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOTNEIGHBOR },
      { "beyond-unr", ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_BEYONDSCOPE },
      { "addr-unr", ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_ADDR },
      { "port-unr", ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT },
      { "transit", ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_TRANSIT },
      { "reassemb", ICMP6_TIME_EXCEEDED, ICMP6_TIME_EXCEED_REASSEMBLY },
      { "badhead", ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER },
      { "nxthdr", ICMP6_PARAM_PROB, ICMP6_PARAMPROB_NEXTHEADER },
      { "redironlink", ND_REDIRECT, ND_REDIRECT_ONLINK },
      { "redirrouter", ND_REDIRECT, ND_REDIRECT_ROUTER }
};

const struct pf_timeout pf_timeouts[] = {
      { "tcp.first",          PFTM_TCP_FIRST_PACKET },
      { "tcp.opening",  PFTM_TCP_OPENING },
      { "tcp.established",    PFTM_TCP_ESTABLISHED },
      { "tcp.closing",  PFTM_TCP_CLOSING },
      { "tcp.finwait",  PFTM_TCP_FIN_WAIT },
      { "tcp.closed",         PFTM_TCP_CLOSED },
      { "tcp.tsdiff",         PFTM_TS_DIFF },
      { "udp.first",          PFTM_UDP_FIRST_PACKET },
      { "udp.single",         PFTM_UDP_SINGLE },
      { "udp.multiple", PFTM_UDP_MULTIPLE },
      { "icmp.first",         PFTM_ICMP_FIRST_PACKET },
      { "icmp.error",         PFTM_ICMP_ERROR_REPLY },
      { "other.first",  PFTM_OTHER_FIRST_PACKET },
      { "other.single", PFTM_OTHER_SINGLE },
      { "other.multiple",     PFTM_OTHER_MULTIPLE },
      { "frag",         PFTM_FRAG },
      { "interval",           PFTM_INTERVAL },
      { "adaptive.start",     PFTM_ADAPTIVE_START },
      { "adaptive.end", PFTM_ADAPTIVE_END },
      { "src.track",          PFTM_SRC_NODE },
      { NULL,                 0 }
};

const struct icmptypeent *
geticmptypebynumber(u_int8_t type, sa_family_t af)
{
      unsigned int      i;

      if (af != AF_INET6) {
            for (i=0; i < (sizeof (icmp_type) / sizeof(icmp_type[0]));
                i++) {
                  if (type == icmp_type[i].type)
                        return (&icmp_type[i]);
            }
      } else {
            for (i=0; i < (sizeof (icmp6_type) /
                sizeof(icmp6_type[0])); i++) {
                  if (type == icmp6_type[i].type)
                         return (&icmp6_type[i]);
            }
      }
      return (NULL);
}

const struct icmptypeent *
geticmptypebyname(char *w, sa_family_t af)
{
      unsigned int      i;

      if (af != AF_INET6) {
            for (i=0; i < (sizeof (icmp_type) / sizeof(icmp_type[0]));
                i++) {
                  if (!strcmp(w, icmp_type[i].name))
                        return (&icmp_type[i]);
            }
      } else {
            for (i=0; i < (sizeof (icmp6_type) /
                sizeof(icmp6_type[0])); i++) {
                  if (!strcmp(w, icmp6_type[i].name))
                        return (&icmp6_type[i]);
            }
      }
      return (NULL);
}

const struct icmpcodeent *
geticmpcodebynumber(u_int8_t type, u_int8_t code, sa_family_t af)
{
      unsigned int      i;

      if (af != AF_INET6) {
            for (i=0; i < (sizeof (icmp_code) / sizeof(icmp_code[0]));
                i++) {
                  if (type == icmp_code[i].type &&
                      code == icmp_code[i].code)
                        return (&icmp_code[i]);
            }
      } else {
            for (i=0; i < (sizeof (icmp6_code) /
                sizeof(icmp6_code[0])); i++) {
                  if (type == icmp6_code[i].type &&
                      code == icmp6_code[i].code)
                        return (&icmp6_code[i]);
            }
      }
      return (NULL);
}

const struct icmpcodeent *
geticmpcodebyname(u_long type, char *w, sa_family_t af)
{
      unsigned int      i;

      if (af != AF_INET6) {
            for (i=0; i < (sizeof (icmp_code) / sizeof(icmp_code[0]));
                i++) {
                  if (type == icmp_code[i].type &&
                      !strcmp(w, icmp_code[i].name))
                        return (&icmp_code[i]);
            }
      } else {
            for (i=0; i < (sizeof (icmp6_code) /
                sizeof(icmp6_code[0])); i++) {
                  if (type == icmp6_code[i].type &&
                      !strcmp(w, icmp6_code[i].name))
                        return (&icmp6_code[i]);
            }
      }
      return (NULL);
}

void
print_op(u_int8_t op, const char *a1, const char *a2)
{
      if (op == PF_OP_IRG)
            printf(" %s >< %s", a1, a2);
      else if (op == PF_OP_XRG)
            printf(" %s <> %s", a1, a2);
      else if (op == PF_OP_EQ)
            printf(" = %s", a1);
      else if (op == PF_OP_NE)
            printf(" != %s", a1);
      else if (op == PF_OP_LT)
            printf(" < %s", a1);
      else if (op == PF_OP_LE)
            printf(" <= %s", a1);
      else if (op == PF_OP_GT)
            printf(" > %s", a1);
      else if (op == PF_OP_GE)
            printf(" >= %s", a1);
      else if (op == PF_OP_RRG)
            printf(" %s:%s", a1, a2);
}

void
print_port(u_int8_t op, u_int16_t p1, u_int16_t p2, const char *proto)
{
      char         a1[6], a2[6];
      struct servent    *s;

      s = getservbyport(p1, proto);
      p1 = ntohs(p1);
      p2 = ntohs(p2);
      snprintf(a1, sizeof(a1), "%u", p1);
      snprintf(a2, sizeof(a2), "%u", p2);
      printf(" port");
      if (s != NULL && (op == PF_OP_EQ || op == PF_OP_NE))
            print_op(op, s->s_name, a2);
      else
            print_op(op, a1, a2);
}

void
print_ugid(u_int8_t op, unsigned u1, unsigned u2, const char *t, unsigned umax)
{
      char  a1[11], a2[11];

      snprintf(a1, sizeof(a1), "%u", u1);
      snprintf(a2, sizeof(a2), "%u", u2);
      printf(" %s", t);
      if (u1 == umax && (op == PF_OP_EQ || op == PF_OP_NE))
            print_op(op, "unknown", a2);
      else
            print_op(op, a1, a2);
}

void
print_flags(u_int8_t f)
{
      int   i;

      for (i = 0; tcpflags[i]; ++i)
            if (f & (1 << i))
                  printf("%c", tcpflags[i]);
}

void
print_fromto(struct pf_rule_addr *src, pf_osfp_t osfp, struct pf_rule_addr *dst,
    sa_family_t af, u_int8_t proto, int verbose)
{
      char buf[PF_OSFP_LEN*3];
      if (src->addr.type == PF_ADDR_ADDRMASK &&
          dst->addr.type == PF_ADDR_ADDRMASK &&
          PF_AZERO(&src->addr.v.a.addr, AF_INET6) &&
          PF_AZERO(&src->addr.v.a.mask, AF_INET6) &&
          PF_AZERO(&dst->addr.v.a.addr, AF_INET6) &&
          PF_AZERO(&dst->addr.v.a.mask, AF_INET6) &&
          !src->neg && !dst->neg &&
          !src->port_op && !dst->port_op &&
          osfp == PF_OSFP_ANY)
            printf(" all");
      else {
            printf(" from ");
            if (src->neg)
                  printf("! ");
            print_addr(&src->addr, af, verbose);
            if (src->port_op)
                  print_port(src->port_op, src->port[0],
                      src->port[1],
                      proto == IPPROTO_TCP ? "tcp" : "udp");
            if (osfp != PF_OSFP_ANY)
                  printf(" os \"%s\"", pfctl_lookup_fingerprint(osfp, buf,
                      sizeof(buf)));

            printf(" to ");
            if (dst->neg)
                  printf("! ");
            print_addr(&dst->addr, af, verbose);
            if (dst->port_op)
                  print_port(dst->port_op, dst->port[0],
                      dst->port[1],
                      proto == IPPROTO_TCP ? "tcp" : "udp");
      }
}

void
print_pool(struct pf_pool *pool, u_int16_t p1, u_int16_t p2,
    sa_family_t af, int id)
{
      struct pf_pooladdr      *pooladdr;

      if ((TAILQ_FIRST(&pool->list) != NULL) &&
          TAILQ_NEXT(TAILQ_FIRST(&pool->list), entries) != NULL)
            printf("{ ");
      TAILQ_FOREACH(pooladdr, &pool->list, entries){
            switch (id) {
            case PF_NAT:
            case PF_RDR:
            case PF_BINAT:
                  print_addr(&pooladdr->addr, af, 0);
                  break;
            case PF_PASS:
                  if (PF_AZERO(&pooladdr->addr.v.a.addr, af))
                        printf("%s", pooladdr->ifname);
                  else {
                        printf("(%s ", pooladdr->ifname);
                        print_addr(&pooladdr->addr, af, 0);
                        printf(")");
                  }
                  break;
            default:
                  break;
            }
            if (TAILQ_NEXT(pooladdr, entries) != NULL)
                  printf(", ");
            else if (TAILQ_NEXT(TAILQ_FIRST(&pool->list), entries) != NULL)
                  printf(" }");
      }
      switch (id) {
      case PF_NAT:
            if ((p1 != PF_NAT_PROXY_PORT_LOW ||
                p2 != PF_NAT_PROXY_PORT_HIGH) && (p1 != 0 || p2 != 0)) {
                  if (p1 == p2)
                        printf(" port %u", p1);
                  else
                        printf(" port %u:%u", p1, p2);
            }
            break;
      case PF_RDR:
            if (p1) {
                  printf(" port %u", p1);
                  if (p2 && (p2 != p1))
                        printf(":%u", p2);
            }
            break;
      default:
            break;
      }
      switch (pool->opts & PF_POOL_TYPEMASK) {
      case PF_POOL_NONE:
            break;
      case PF_POOL_BITMASK:
            printf(" bitmask");
            break;
      case PF_POOL_RANDOM:
            printf(" random");
            break;
      case PF_POOL_SRCHASH:
            printf(" source-hash 0x%08x%08x%08x%08x",
                pool->key.key32[0], pool->key.key32[1],
                pool->key.key32[2], pool->key.key32[3]);
            break;
      case PF_POOL_ROUNDROBIN:
            printf(" round-robin");
            break;
      }
      if (pool->opts & PF_POOL_STICKYADDR)
            printf(" sticky-address");
      if (id == PF_NAT && p1 == 0 && p2 == 0)
            printf(" static-port");
}

const char  *pf_reasons[PFRES_MAX+1] = PFRES_NAMES;
const char  *pf_lcounters[LCNT_MAX+1] = LCNT_NAMES;
const char  *pf_fcounters[FCNT_MAX+1] = FCNT_NAMES;
const char  *pf_scounters[FCNT_MAX+1] = FCNT_NAMES;

void
print_status(struct pf_status *s, int opts)
{
      char              statline[80], *running;
      time_t                  runtime;
      int               i;
      char              buf[PF_MD5_DIGEST_LENGTH * 2 + 1];
      static const char hex[] = "0123456789abcdef";

      runtime = time(NULL) - s->since;
      running = s->running ? "Enabled" : "Disabled";

      if (s->since) {
            unsigned    sec, min, hrs, day = runtime;

            sec = day % 60;
            day /= 60;
            min = day % 60;
            day /= 60;
            hrs = day % 24;
            day /= 24;
            snprintf(statline, sizeof(statline),
                "Status: %s for %u days %.2u:%.2u:%.2u",
                running, day, hrs, min, sec);
      } else
            snprintf(statline, sizeof(statline), "Status: %s", running);
      printf("%-44s", statline);
      switch (s->debug) {
      case PF_DEBUG_NONE:
            printf("%15s\n\n", "Debug: None");
            break;
      case PF_DEBUG_URGENT:
            printf("%15s\n\n", "Debug: Urgent");
            break;
      case PF_DEBUG_MISC:
            printf("%15s\n\n", "Debug: Misc");
            break;
      case PF_DEBUG_NOISY:
            printf("%15s\n\n", "Debug: Loud");
            break;
      }

      if (opts & PF_OPT_VERBOSE) {
            printf("Hostid:   0x%08x\n", ntohl(s->hostid));

            for (i = 0; i < PF_MD5_DIGEST_LENGTH; i++) {
                  buf[i + i] = hex[s->pf_chksum[i] >> 4];
                  buf[i + i + 1] = hex[s->pf_chksum[i] & 0x0f];
            }
            buf[i + i] = '\0';
            printf("Checksum: 0x%s\n\n", buf);
      }

      if (s->ifname[0] != 0) {
            printf("Interface Stats for %-16s %5s %16s\n",
                s->ifname, "IPv4", "IPv6");
            printf("  %-25s %14llu %16llu\n", "Bytes In",
                (unsigned long long)s->bcounters[0][0],
                (unsigned long long)s->bcounters[1][0]);
            printf("  %-25s %14llu %16llu\n", "Bytes Out",
                (unsigned long long)s->bcounters[0][1],
                (unsigned long long)s->bcounters[1][1]);
            printf("  Packets In\n");
            printf("    %-23s %14llu %16llu\n", "Passed",
                (unsigned long long)s->pcounters[0][0][PF_PASS],
                (unsigned long long)s->pcounters[1][0][PF_PASS]);
            printf("    %-23s %14llu %16llu\n", "Blocked",
                (unsigned long long)s->pcounters[0][0][PF_DROP],
                (unsigned long long)s->pcounters[1][0][PF_DROP]);
            printf("  Packets Out\n");
            printf("    %-23s %14llu %16llu\n", "Passed",
                (unsigned long long)s->pcounters[0][1][PF_PASS],
                (unsigned long long)s->pcounters[1][1][PF_PASS]);
            printf("    %-23s %14llu %16llu\n\n", "Blocked",
                (unsigned long long)s->pcounters[0][1][PF_DROP],
                (unsigned long long)s->pcounters[1][1][PF_DROP]);
      }
      printf("%-27s %14s %16s\n", "State Table", "Total", "Rate");
      printf("  %-25s %14u %14s\n", "current entries", s->states, "");
      for (i = 0; i < FCNT_MAX; i++) {
            printf("  %-25s %14llu ", pf_fcounters[i],
                      (unsigned long long)s->fcounters[i]);
            if (runtime > 0)
                  printf("%14.1f/s\n",
                      (double)s->fcounters[i] / (double)runtime);
            else
                  printf("%14s\n", "");
      }
      if (opts & PF_OPT_VERBOSE) {
            printf("Source Tracking Table\n");
            printf("  %-25s %14u %14s\n", "current entries",
                s->src_nodes, "");
            for (i = 0; i < SCNT_MAX; i++) {
                  printf("  %-25s %14lld ", pf_scounters[i],
                           (unsigned long long)s->scounters[i]);
                  if (runtime > 0)
                        printf("%14.1f/s\n",
                            (double)s->scounters[i] / (double)runtime);
                  else
                        printf("%14s\n", "");
            }
      }
      printf("Counters\n");
      for (i = 0; i < PFRES_MAX; i++) {
            printf("  %-25s %14llu ", pf_reasons[i],
                (unsigned long long)s->counters[i]);
            if (runtime > 0)
                  printf("%14.1f/s\n",
                      (double)s->counters[i] / (double)runtime);
            else
                  printf("%14s\n", "");
      }
      if (opts & PF_OPT_VERBOSE) {
            printf("Limit Counters\n");
            for (i = 0; i < LCNT_MAX; i++) {
                  printf("  %-25s %14lld ", pf_lcounters[i],
#ifdef __FreeBSD__
                            (unsigned long long)s->lcounters[i]);
#else
                            s->lcounters[i]);
#endif
                  if (runtime > 0)
                        printf("%14.1f/s\n",
                            (double)s->lcounters[i] / (double)runtime);
                  else
                        printf("%14s\n", "");
            }
      }
}

void
print_src_node(struct pf_src_node *sn, int opts)
{
      struct pf_addr_wrap aw;
      int min, sec;

      memset(&aw, 0, sizeof(aw));
      if (sn->af == AF_INET)
            aw.v.a.mask.addr32[0] = 0xffffffff;
      else
            memset(&aw.v.a.mask, 0xff, sizeof(aw.v.a.mask));

      aw.v.a.addr = sn->addr;
      print_addr(&aw, sn->af, opts & PF_OPT_VERBOSE2);
      printf(" -> ");
      aw.v.a.addr = sn->raddr;
      print_addr(&aw, sn->af, opts & PF_OPT_VERBOSE2);
      printf(" ( states %u, connections %u, rate %u.%u/%us )\n", sn->states,
          sn->conn, sn->conn_rate.count / 1000,
          (sn->conn_rate.count % 1000) / 100, sn->conn_rate.seconds);
      if (opts & PF_OPT_VERBOSE) {
            sec = sn->creation % 60;
            sn->creation /= 60;
            min = sn->creation % 60;
            sn->creation /= 60;
            printf("   age %.2u:%.2u:%.2u", sn->creation, min, sec);
            if (sn->states == 0) {
                  sec = sn->expire % 60;
                  sn->expire /= 60;
                  min = sn->expire % 60;
                  sn->expire /= 60;
                  printf(", expires in %.2u:%.2u:%.2u",
                      sn->expire, min, sec);
            }
            printf(", %llu pkts, %llu bytes",
#ifdef __FreeBSD__
                (unsigned long long)(sn->packets[0] + sn->packets[1]),
                (unsigned long long)(sn->bytes[0] + sn->bytes[1]));
#else
                sn->packets[0] + sn->packets[1],
                sn->bytes[0] + sn->bytes[1]);
#endif
            switch (sn->ruletype) {
            case PF_NAT:
                  if (sn->rule.nr != -1)
                        printf(", nat rule %u", sn->rule.nr);
                  break;
            case PF_RDR:
                  if (sn->rule.nr != -1)
                        printf(", rdr rule %u", sn->rule.nr);
                  break;
            case PF_PASS:
                  if (sn->rule.nr != -1)
                        printf(", filter rule %u", sn->rule.nr);
                  break;
            }
            printf("\n");
      }
}

void
print_rule(struct pf_rule *r, const char *anchor_call, int verbose)
{
      static const char *actiontypes[] = { "pass", "block", "scrub",
          "no scrub", "nat", "no nat", "binat", "no binat", "rdr", "no rdr" };
      static const char *anchortypes[] = { "anchor", "anchor", "anchor",
          "anchor", "nat-anchor", "nat-anchor", "binat-anchor",
          "binat-anchor", "rdr-anchor", "rdr-anchor" };
      int   i, opts;

      if (verbose)
            printf("@%d ", r->nr);
      if (r->action > PF_NORDR)
            printf("action(%d)", r->action);
      else if (anchor_call[0]) {
            if (anchor_call[0] == '_') {
                  printf("%s", anchortypes[r->action]);
            } else
                  printf("%s \"%s\"", anchortypes[r->action],
                      anchor_call);
      } else {
            printf("%s", actiontypes[r->action]);
            if (r->natpass)
                  printf(" pass");
      }
      if (r->action == PF_DROP) {
            if (r->rule_flag & PFRULE_RETURN)
                  printf(" return");
            else if (r->rule_flag & PFRULE_RETURNRST) {
                  if (!r->return_ttl)
                        printf(" return-rst");
                  else
                        printf(" return-rst(ttl %d)", r->return_ttl);
            } else if (r->rule_flag & PFRULE_RETURNICMP) {
                  const struct icmpcodeent      *ic, *ic6;

                  ic = geticmpcodebynumber(r->return_icmp >> 8,
                      r->return_icmp & 255, AF_INET);
                  ic6 = geticmpcodebynumber(r->return_icmp6 >> 8,
                      r->return_icmp6 & 255, AF_INET6);

                  switch (r->af) {
                  case AF_INET:
                        printf(" return-icmp");
                        if (ic == NULL)
                              printf("(%u)", r->return_icmp & 255);
                        else
                              printf("(%s)", ic->name);
                        break;
                  case AF_INET6:
                        printf(" return-icmp6");
                        if (ic6 == NULL)
                              printf("(%u)", r->return_icmp6 & 255);
                        else
                              printf("(%s)", ic6->name);
                        break;
                  default:
                        printf(" return-icmp");
                        if (ic == NULL)
                              printf("(%u, ", r->return_icmp & 255);
                        else
                              printf("(%s, ", ic->name);
                        if (ic6 == NULL)
                              printf("%u)", r->return_icmp6 & 255);
                        else
                              printf("%s)", ic6->name);
                        break;
                  }
            } else
                  printf(" drop");
      }
      if (r->direction == PF_IN)
            printf(" in");
      else if (r->direction == PF_OUT)
            printf(" out");
      if (r->log) {
            printf(" log");
            if (r->log & ~PF_LOG || r->logif) {
                  int count = 0;

                  printf(" (");
                  if (r->log & PF_LOG_ALL)
                        printf("%sall", count++ ? ", " : "");
                  if (r->log & PF_LOG_SOCKET_LOOKUP)
                        printf("%suser", count++ ? ", " : "");
                  if (r->logif)
                        printf("%sto pflog%u", count++ ? ", " : "",
                            r->logif);
                  printf(")");
            }
      }
      if (r->quick)
            printf(" quick");
      if (r->ifname[0]) {
            if (r->ifnot)
                  printf(" on ! %s", r->ifname);
            else
                  printf(" on %s", r->ifname);
      }
      if (r->rt) {
            if (r->rt == PF_ROUTETO)
                  printf(" route-to");
            else if (r->rt == PF_REPLYTO)
                  printf(" reply-to");
            else if (r->rt == PF_DUPTO)
                  printf(" dup-to");
            else if (r->rt == PF_FASTROUTE)
                  printf(" fastroute");
            if (r->rt != PF_FASTROUTE) {
                  printf(" ");
                  print_pool(&r->rpool, 0, 0, r->af, PF_PASS);
            }
      }
      if (r->af) {
            if (r->af == AF_INET)
                  printf(" inet");
            else
                  printf(" inet6");
      }
      if (r->proto) {
            struct protoent   *p;

            if ((p = getprotobynumber(r->proto)) != NULL)
                  printf(" proto %s", p->p_name);
            else
                  printf(" proto %u", r->proto);
      }
      print_fromto(&r->src, r->os_fingerprint, &r->dst, r->af, r->proto,
          verbose);
      if (r->uid.op)
            print_ugid(r->uid.op, r->uid.uid[0], r->uid.uid[1], "user",
                UID_MAX);
      if (r->gid.op)
            print_ugid(r->gid.op, r->gid.gid[0], r->gid.gid[1], "group",
                GID_MAX);
      if (r->flags || r->flagset) {
            printf(" flags ");
            print_flags(r->flags);
            printf("/");
            print_flags(r->flagset);
      } else if (r->action == PF_PASS &&
          (!r->proto || r->proto == IPPROTO_TCP) &&
          !(r->rule_flag & PFRULE_FRAGMENT) &&
          !anchor_call[0] && r->keep_state)
            printf(" flags any");
      if (r->type) {
            const struct icmptypeent      *it;

            it = geticmptypebynumber(r->type-1, r->af);
            if (r->af != AF_INET6)
                  printf(" icmp-type");
            else
                  printf(" icmp6-type");
            if (it != NULL)
                  printf(" %s", it->name);
            else
                  printf(" %u", r->type-1);
            if (r->code) {
                  const struct icmpcodeent      *ic;

                  ic = geticmpcodebynumber(r->type-1, r->code-1, r->af);
                  if (ic != NULL)
                        printf(" code %s", ic->name);
                  else
                        printf(" code %u", r->code-1);
            }
      }
      if (r->tos)
            printf(" tos 0x%2.2x", r->tos);
      if (!r->keep_state && r->action == PF_PASS && !anchor_call[0])
            printf(" no state");
      else if (r->keep_state == PF_STATE_NORMAL)
            printf(" keep state");
      else if (r->keep_state == PF_STATE_MODULATE)
            printf(" modulate state");
      else if (r->keep_state == PF_STATE_SYNPROXY)
            printf(" synproxy state");
      if (r->prob) {
            char  buf[20];

            snprintf(buf, sizeof(buf), "%f", r->prob*100.0/(UINT_MAX+1.0));
            for (i = strlen(buf)-1; i > 0; i--) {
                  if (buf[i] == '0')
                        buf[i] = '\0';
                  else {
                        if (buf[i] == '.')
                              buf[i] = '\0';
                        break;
                  }
            }
            printf(" probability %s%%", buf);
      }
      opts = 0;
      if (r->max_states || r->max_src_nodes || r->max_src_states)
            opts = 1;
      if (r->rule_flag & PFRULE_NOSYNC)
            opts = 1;
      if (r->rule_flag & PFRULE_SRCTRACK)
            opts = 1;
      if (r->rule_flag & PFRULE_IFBOUND)
            opts = 1;
      for (i = 0; !opts && i < PFTM_MAX; ++i)
            if (r->timeout[i])
                  opts = 1;
      if (opts) {
            printf(" (");
            if (r->max_states) {
                  printf("max %u", r->max_states);
                  opts = 0;
            }
            if (r->rule_flag & PFRULE_NOSYNC) {
                  if (!opts)
                        printf(", ");
                  printf("no-sync");
                  opts = 0;
            }
            if (r->rule_flag & PFRULE_SRCTRACK) {
                  if (!opts)
                        printf(", ");
                  printf("source-track");
                  if (r->rule_flag & PFRULE_RULESRCTRACK)
                        printf(" rule");
                  else
                        printf(" global");
                  opts = 0;
            }
            if (r->max_src_states) {
                  if (!opts)
                        printf(", ");
                  printf("max-src-states %u", r->max_src_states);
                  opts = 0;
            }
            if (r->max_src_conn) {
                  if (!opts)
                        printf(", ");
                  printf("max-src-conn %u", r->max_src_conn);
                  opts = 0;
            }
            if (r->max_src_conn_rate.limit) {
                  if (!opts)
                        printf(", ");
                  printf("max-src-conn-rate %u/%u",
                      r->max_src_conn_rate.limit,
                      r->max_src_conn_rate.seconds);
                  opts = 0;
            }
            if (r->max_src_nodes) {
                  if (!opts)
                        printf(", ");
                  printf("max-src-nodes %u", r->max_src_nodes);
                  opts = 0;
            }
            if (r->overload_tblname[0]) {
                  if (!opts)
                        printf(", ");
                  printf("overload <%s>", r->overload_tblname);
                  if (r->flush)
                        printf(" flush");
                  if (r->flush & PF_FLUSH_GLOBAL)
                        printf(" global");
            }
            if (r->rule_flag & PFRULE_IFBOUND) {
                  if (!opts)
                        printf(", ");
                  printf("if-bound");
                  opts = 0;
            }
            for (i = 0; i < PFTM_MAX; ++i)
                  if (r->timeout[i]) {
                        int j;

                        if (!opts)
                              printf(", ");
                        opts = 0;
                        for (j = 0; pf_timeouts[j].name != NULL;
                            ++j)
                              if (pf_timeouts[j].timeout == i)
                                    break;
                        printf("%s %u", pf_timeouts[j].name == NULL ?
                            "inv.timeout" : pf_timeouts[j].name,
                            r->timeout[i]);
                  }
            printf(")");
      }
      if (r->rule_flag & PFRULE_FRAGMENT)
            printf(" fragment");
      if (r->rule_flag & PFRULE_NODF)
            printf(" no-df");
      if (r->rule_flag & PFRULE_RANDOMID)
            printf(" random-id");
      if (r->min_ttl)
            printf(" min-ttl %d", r->min_ttl);
      if (r->max_mss)
            printf(" max-mss %d", r->max_mss);
      if (r->allow_opts)
            printf(" allow-opts");
      if (r->action == PF_SCRUB) {
            if (r->rule_flag & PFRULE_REASSEMBLE_TCP)
                  printf(" reassemble tcp");

            if (r->rule_flag & PFRULE_FRAGDROP)
                  printf(" fragment drop-ovl");
            else if (r->rule_flag & PFRULE_FRAGCROP)
                  printf(" fragment crop");
            else
                  printf(" fragment reassemble");
      }
      if (r->label[0])
            printf(" label \"%s\"", r->label);
      if (r->qname[0] && r->pqname[0])
            printf(" queue(%s, %s)", r->qname, r->pqname);
      else if (r->qname[0])
            printf(" queue %s", r->qname);
      if (r->tagname[0])
            printf(" tag %s", r->tagname);
      if (r->match_tagname[0]) {
            if (r->match_tag_not)
                  printf(" !");
            printf(" tagged %s", r->match_tagname);
      }
      if (r->rtableid != -1)
            printf(" rtable %u", r->rtableid);
      if (!anchor_call[0] && (r->action == PF_NAT ||
          r->action == PF_BINAT || r->action == PF_RDR)) {
            printf(" -> ");
            print_pool(&r->rpool, r->rpool.proxy_port[0],
                r->rpool.proxy_port[1], r->af, r->action);
      }
}

void
print_tabledef(const char *name, int flags, int addrs,
    struct node_tinithead *nodes)
{
      struct node_tinit *ti, *nti;
      struct node_host  *h;

      printf("table <%s>", name);
      if (flags & PFR_TFLAG_CONST)
            printf(" const");
      if (flags & PFR_TFLAG_PERSIST)
            printf(" persist");
      SIMPLEQ_FOREACH(ti, nodes, entries) {
            if (ti->file) {
                  printf(" file \"%s\"", ti->file);
                  continue;
            }
            printf(" {");
            for (;;) {
                  for (h = ti->host; h != NULL; h = h->next) {
                        printf(h->not ? " !" : " ");
                        print_addr(&h->addr, h->af, 0);
                  }
                  nti = SIMPLEQ_NEXT(ti, entries);
                  if (nti != NULL && nti->file == NULL)
                        ti = nti;   /* merge lists */
                  else
                        break;
            }
            printf(" }");
      }
      if (addrs && SIMPLEQ_EMPTY(nodes))
            printf(" { }");
      printf("\n");
}

int
parse_flags(char *s)
{
      char        *p, *q;
      u_int8_t     f = 0;

      for (p = s; *p; p++) {
            if ((q = strchr(tcpflags, *p)) == NULL)
                  return -1;
            else
                  f |= 1 << (q - tcpflags);
      }
      return (f ? f : PF_TH_ALL);
}

void
set_ipmask(struct node_host *h, u_int8_t b)
{
      struct pf_addr    *m, *n;
      int          i, j = 0;

      m = &h->addr.v.a.mask;
      memset(m, 0, sizeof(*m));

      while (b >= 32) {
            m->addr32[j++] = 0xffffffff;
            b -= 32;
      }
      for (i = 31; i > 31-b; --i)
            m->addr32[j] |= (1 << i);
      if (b)
            m->addr32[j] = htonl(m->addr32[j]);

      /* Mask off bits of the address that will never be used. */
      n = &h->addr.v.a.addr;
      if (h->addr.type == PF_ADDR_ADDRMASK)
            for (i = 0; i < 4; i++)
                  n->addr32[i] = n->addr32[i] & m->addr32[i];
}

int
check_netmask(struct node_host *h, sa_family_t af)
{
      struct node_host  *n = NULL;
      struct pf_addr    *m;

      for (n = h; n != NULL; n = n->next) {
            if (h->addr.type == PF_ADDR_TABLE)
                  continue;
            m = &h->addr.v.a.mask;
            /* fix up netmask for dynaddr */
            if (af == AF_INET && h->addr.type == PF_ADDR_DYNIFTL &&
                unmask(m, AF_INET6) > 32)
                  set_ipmask(n, 32);
            /* netmasks > 32 bit are invalid on v4 */
            if (af == AF_INET &&
                (m->addr32[1] || m->addr32[2] || m->addr32[3])) {
                  fprintf(stderr, "netmask %u invalid for IPv4 address\n",
                      unmask(m, AF_INET6));
                  return (1);
            }
      }
      return (0);
}

/* interface lookup routines */

struct node_host  *iftab;

void
ifa_load(void)
{
      struct ifaddrs          *ifap, *ifa;
      struct node_host  *n = NULL, *h = NULL;

      if (getifaddrs(&ifap) < 0)
            err(1, "getifaddrs");

      for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
            if (!(ifa->ifa_addr->sa_family == AF_INET ||
                ifa->ifa_addr->sa_family == AF_INET6 ||
                ifa->ifa_addr->sa_family == AF_LINK))
                        continue;
            n = calloc(1, sizeof(struct node_host));
            if (n == NULL)
                  err(1, "address: calloc");
            n->af = ifa->ifa_addr->sa_family;
            n->ifa_flags = ifa->ifa_flags;
#ifdef __KAME__
            if (n->af == AF_INET6 &&
                IN6_IS_ADDR_LINKLOCAL(&((struct sockaddr_in6 *)
                ifa->ifa_addr)->sin6_addr) &&
                ((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_scope_id ==
                0) {
                  struct sockaddr_in6     *sin6;

                  sin6 = (struct sockaddr_in6 *)ifa->ifa_addr;
                  sin6->sin6_scope_id = sin6->sin6_addr.s6_addr[2] << 8 |
                      sin6->sin6_addr.s6_addr[3];
                  sin6->sin6_addr.s6_addr[2] = 0;
                  sin6->sin6_addr.s6_addr[3] = 0;
            }
#endif
            n->ifindex = 0;
            if (n->af == AF_INET) {
                  memcpy(&n->addr.v.a.addr, &((struct sockaddr_in *)
                      ifa->ifa_addr)->sin_addr.s_addr,
                      sizeof(struct in_addr));
                  memcpy(&n->addr.v.a.mask, &((struct sockaddr_in *)
                      ifa->ifa_netmask)->sin_addr.s_addr,
                      sizeof(struct in_addr));
                  if (ifa->ifa_broadaddr != NULL)
                        memcpy(&n->bcast, &((struct sockaddr_in *)
                            ifa->ifa_broadaddr)->sin_addr.s_addr,
                            sizeof(struct in_addr));
                  if (ifa->ifa_dstaddr != NULL)
                        memcpy(&n->peer, &((struct sockaddr_in *)
                            ifa->ifa_dstaddr)->sin_addr.s_addr,
                            sizeof(struct in_addr));
            } else if (n->af == AF_INET6) {
                  memcpy(&n->addr.v.a.addr, &((struct sockaddr_in6 *)
                      ifa->ifa_addr)->sin6_addr.s6_addr,
                      sizeof(struct in6_addr));
                  memcpy(&n->addr.v.a.mask, &((struct sockaddr_in6 *)
                      ifa->ifa_netmask)->sin6_addr.s6_addr,
                      sizeof(struct in6_addr));
                  if (ifa->ifa_broadaddr != NULL)
                        memcpy(&n->bcast, &((struct sockaddr_in6 *)
                            ifa->ifa_broadaddr)->sin6_addr.s6_addr,
                            sizeof(struct in6_addr));
                  if (ifa->ifa_dstaddr != NULL)
                         memcpy(&n->peer, &((struct sockaddr_in6 *)
                            ifa->ifa_dstaddr)->sin6_addr.s6_addr,
                            sizeof(struct in6_addr));
                  n->ifindex = ((struct sockaddr_in6 *)
                      ifa->ifa_addr)->sin6_scope_id;
            }
            if ((n->ifname = strdup(ifa->ifa_name)) == NULL)
                  err(1, "ifa_load: strdup");
            n->next = NULL;
            n->tail = n;
            if (h == NULL)
                  h = n;
            else {
                  h->tail->next = n;
                  h->tail = n;
            }
      }

      iftab = h;
      freeifaddrs(ifap);
}

struct node_host *
ifa_exists(const char *ifa_name)
{
      struct node_host  *n;
      struct ifgroupreq ifgr;
      int               s;

      if (iftab == NULL)
            ifa_load();

      /* check wether this is a group */
      if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
            err(1, "socket");
      bzero(&ifgr, sizeof(ifgr));
      strlcpy(ifgr.ifgr_name, ifa_name, sizeof(ifgr.ifgr_name));
      if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == 0) {
            /* fake a node_host */
            if ((n = calloc(1, sizeof(*n))) == NULL)
                  err(1, "calloc");
            if ((n->ifname = strdup(ifa_name)) == NULL)
                  err(1, "strdup");
            close(s);
            return (n);
      }
      close(s);

      for (n = iftab; n; n = n->next) {
            if (n->af == AF_LINK && !strncmp(n->ifname, ifa_name, IFNAMSIZ))
                  return (n);
      }

      return (NULL);
}

struct node_host *
ifa_grouplookup(const char *ifa_name, int flags)
{
      struct ifg_req          *ifg;
      struct ifgroupreq  ifgr;
      int                s, len;
      struct node_host  *n, *h = NULL;

      if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
            err(1, "socket");
      bzero(&ifgr, sizeof(ifgr));
      strlcpy(ifgr.ifgr_name, ifa_name, sizeof(ifgr.ifgr_name));
      if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1) {
            close(s);
            return (NULL);
      }

      len = ifgr.ifgr_len;
      if ((ifgr.ifgr_groups = calloc(1, len)) == NULL)
            err(1, "calloc");
      if (ioctl(s, SIOCGIFGMEMB, (caddr_t)&ifgr) == -1)
            err(1, "SIOCGIFGMEMB");

      for (ifg = ifgr.ifgr_groups; ifg && len >= sizeof(struct ifg_req);
          ifg++) {
            len -= sizeof(struct ifg_req);
            if ((n = ifa_lookup(ifg->ifgrq_member, flags)) == NULL)
                  continue;
            if (h == NULL)
                  h = n;
            else {
                  h->tail->next = n;
                  h->tail = n->tail;
            }
      }
      free(ifgr.ifgr_groups);
      close(s);

      return (h);
}

struct node_host *
ifa_lookup(const char *ifa_name, int flags)
{
      struct node_host  *p = NULL, *h = NULL, *n = NULL;
      int                got4 = 0, got6 = 0;
      const char         *last_if = NULL;

      if ((h = ifa_grouplookup(ifa_name, flags)) != NULL)
            return (h);

      if (!strncmp(ifa_name, "self", IFNAMSIZ))
            ifa_name = NULL;

      if (iftab == NULL)
            ifa_load();

      for (p = iftab; p; p = p->next) {
            if (ifa_skip_if(ifa_name, p))
                  continue;
            if ((flags & PFI_AFLAG_BROADCAST) && p->af != AF_INET)
                  continue;
            if ((flags & PFI_AFLAG_BROADCAST) &&
                !(p->ifa_flags & IFF_BROADCAST))
                  continue;
            if ((flags & PFI_AFLAG_PEER) &&
                !(p->ifa_flags & IFF_POINTOPOINT))
                  continue;
            if ((flags & PFI_AFLAG_NETWORK) && p->ifindex > 0)
                  continue;
            if (last_if == NULL || strcmp(last_if, p->ifname))
                  got4 = got6 = 0;
            last_if = p->ifname;
            if ((flags & PFI_AFLAG_NOALIAS) && p->af == AF_INET && got4)
                  continue;
            if ((flags & PFI_AFLAG_NOALIAS) && p->af == AF_INET6 && got6)
                  continue;
            if (p->af == AF_INET)
                  got4 = 1;
            else
                  got6 = 1;
            n = calloc(1, sizeof(struct node_host));
            if (n == NULL)
                  err(1, "address: calloc");
            n->af = p->af;
            if (flags & PFI_AFLAG_BROADCAST)
                  memcpy(&n->addr.v.a.addr, &p->bcast,
                      sizeof(struct pf_addr));
            else if (flags & PFI_AFLAG_PEER)
                  memcpy(&n->addr.v.a.addr, &p->peer,
                      sizeof(struct pf_addr));
            else
                  memcpy(&n->addr.v.a.addr, &p->addr.v.a.addr,
                      sizeof(struct pf_addr));
            if (flags & PFI_AFLAG_NETWORK)
                  set_ipmask(n, unmask(&p->addr.v.a.mask, n->af));
            else {
                  if (n->af == AF_INET) {
                        if (p->ifa_flags & IFF_LOOPBACK &&
                            p->ifa_flags & IFF_LINK1)
                              memcpy(&n->addr.v.a.mask,
                                  &p->addr.v.a.mask,
                                  sizeof(struct pf_addr));
                        else
                              set_ipmask(n, 32);
                  } else
                        set_ipmask(n, 128);
            }
            n->ifindex = p->ifindex;

            n->next = NULL;
            n->tail = n;
            if (h == NULL)
                  h = n;
            else {
                  h->tail->next = n;
                  h->tail = n;
            }
      }
      return (h);
}

int
ifa_skip_if(const char *filter, struct node_host *p)
{
      int   n;

      if (p->af != AF_INET && p->af != AF_INET6)
            return (1);
      if (filter == NULL || !*filter)
            return (0);
      if (!strcmp(p->ifname, filter))
            return (0); /* exact match */
      n = strlen(filter);
      if (n < 1 || n >= IFNAMSIZ)
            return (1); /* sanity check */
      if (filter[n-1] >= '0' && filter[n-1] <= '9')
            return (1); /* only do exact match in that case */
      if (strncmp(p->ifname, filter, n))
            return (1); /* prefix doesn't match */
      return (p->ifname[n] < '0' || p->ifname[n] > '9');
}


struct node_host *
host(const char *s)
{
      struct node_host  *h = NULL;
      int                mask, v4mask, v6mask, cont = 1;
      char              *p, *q, *ps;

      if ((p = strrchr(s, '/')) != NULL) {
            mask = strtol(p+1, &q, 0);
            if (!q || *q || mask > 128 || q == (p+1)) {
                  fprintf(stderr, "invalid netmask '%s'\n", p);
                  return (NULL);
            }
            if ((ps = malloc(strlen(s) - strlen(p) + 1)) == NULL)
                  err(1, "host: malloc");
            strlcpy(ps, s, strlen(s) - strlen(p) + 1);
            v4mask = v6mask = mask;
      } else {
            if ((ps = strdup(s)) == NULL)
                  err(1, "host: strdup");
            v4mask = 32;
            v6mask = 128;
            mask = -1;
      }

      /* interface with this name exists? */
      if (cont && (h = host_if(ps, mask)) != NULL)
            cont = 0;

      /* IPv4 address? */
      if (cont && (h = host_v4(s, mask)) != NULL)
            cont = 0;

      /* IPv6 address? */
      if (cont && (h = host_v6(ps, v6mask)) != NULL)
            cont = 0;

      /* dns lookup */
      if (cont && (h = host_dns(ps, v4mask, v6mask)) != NULL)
            cont = 0;
      free(ps);

      if (h == NULL || cont == 1) {
            fprintf(stderr, "no IP address found for %s\n", s);
            return (NULL);
      }
      return (h);
}

struct node_host *
host_if(const char *s, int mask)
{
      struct node_host  *n, *h = NULL;
      char              *p, *ps;
      int                flags = 0;

      if ((ps = strdup(s)) == NULL)
            err(1, "host_if: strdup");
      while ((p = strrchr(ps, ':')) != NULL) {
            if (!strcmp(p+1, "network"))
                  flags |= PFI_AFLAG_NETWORK;
            else if (!strcmp(p+1, "broadcast"))
                  flags |= PFI_AFLAG_BROADCAST;
            else if (!strcmp(p+1, "peer"))
                  flags |= PFI_AFLAG_PEER;
            else if (!strcmp(p+1, "0"))
                  flags |= PFI_AFLAG_NOALIAS;
            else {
                  free(ps);
                  return (NULL);
            }
            *p = '\0';
      }
      if (flags & (flags - 1) & PFI_AFLAG_MODEMASK) { /* Yep! */
            fprintf(stderr, "illegal combination of interface modifiers\n");
            free(ps);
            return (NULL);
      }
      if ((flags & (PFI_AFLAG_NETWORK|PFI_AFLAG_BROADCAST)) && mask > -1) {
            fprintf(stderr, "network or broadcast lookup, but "
                "extra netmask given\n");
            free(ps);
            return (NULL);
      }
      if (ifa_exists(ps) || !strncmp(ps, "self", IFNAMSIZ)) {
            /* interface with this name exists */
            h = ifa_lookup(ps, flags);
            for (n = h; n != NULL && mask > -1; n = n->next)
                  set_ipmask(n, mask);
      }

      free(ps);
      return (h);
}

struct node_host *
host_v4(const char *s, int mask)
{
      struct node_host  *h = NULL;
      struct in_addr           ina;
      int                bits = 32;

      memset(&ina, 0, sizeof(struct in_addr));
      if (strrchr(s, '/') != NULL) {
            if ((bits = inet_net_pton(AF_INET, s, &ina, sizeof(ina))) == -1)
                  return (NULL);
      } else {
            if (inet_pton(AF_INET, s, &ina) != 1)
                  return (NULL);
      }

      h = calloc(1, sizeof(struct node_host));
      if (h == NULL)
            err(1, "address: calloc");
      h->ifname = NULL;
      h->af = AF_INET;
      h->addr.v.a.addr.addr32[0] = ina.s_addr;
      set_ipmask(h, bits);
      h->next = NULL;
      h->tail = h;

      return (h);
}

struct node_host *
host_v6(const char *s, int mask)
{
      struct addrinfo          hints, *res;
      struct node_host  *h = NULL;

      memset(&hints, 0, sizeof(hints));
      hints.ai_family = AF_INET6;
      hints.ai_socktype = SOCK_DGRAM; /*dummy*/
      hints.ai_flags = AI_NUMERICHOST;
      if (getaddrinfo(s, "0", &hints, &res) == 0) {
            h = calloc(1, sizeof(struct node_host));
            if (h == NULL)
                  err(1, "address: calloc");
            h->ifname = NULL;
            h->af = AF_INET6;
            memcpy(&h->addr.v.a.addr,
                &((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
                sizeof(h->addr.v.a.addr));
            h->ifindex =
                ((struct sockaddr_in6 *)res->ai_addr)->sin6_scope_id;
            set_ipmask(h, mask);
            freeaddrinfo(res);
            h->next = NULL;
            h->tail = h;
      }

      return (h);
}

struct node_host *
host_dns(const char *s, int v4mask, int v6mask)
{
      struct addrinfo          hints, *res0, *res;
      struct node_host  *n, *h = NULL;
      int                error, noalias = 0;
      int                got4 = 0, got6 = 0;
      char              *p, *ps;

      if ((ps = strdup(s)) == NULL)
            err(1, "host_dns: strdup");
      if ((p = strrchr(ps, ':')) != NULL && !strcmp(p, ":0")) {
            noalias = 1;
            *p = '\0';
      }
      memset(&hints, 0, sizeof(hints));
      hints.ai_family = PF_UNSPEC;
      hints.ai_socktype = SOCK_STREAM; /* DUMMY */
      error = getaddrinfo(ps, NULL, &hints, &res0);
      if (error) {
            free(ps);
            return (h);
      }

      for (res = res0; res; res = res->ai_next) {
            if (res->ai_family != AF_INET &&
                res->ai_family != AF_INET6)
                  continue;
            if (noalias) {
                  if (res->ai_family == AF_INET) {
                        if (got4)
                              continue;
                        got4 = 1;
                  } else {
                        if (got6)
                              continue;
                        got6 = 1;
                  }
            }
            n = calloc(1, sizeof(struct node_host));
            if (n == NULL)
                  err(1, "host_dns: calloc");
            n->ifname = NULL;
            n->af = res->ai_family;
            if (res->ai_family == AF_INET) {
                  memcpy(&n->addr.v.a.addr,
                      &((struct sockaddr_in *)
                      res->ai_addr)->sin_addr.s_addr,
                      sizeof(struct in_addr));
                  set_ipmask(n, v4mask);
            } else {
                  memcpy(&n->addr.v.a.addr,
                      &((struct sockaddr_in6 *)
                      res->ai_addr)->sin6_addr.s6_addr,
                      sizeof(struct in6_addr));
                  n->ifindex =
                      ((struct sockaddr_in6 *)
                      res->ai_addr)->sin6_scope_id;
                  set_ipmask(n, v6mask);
            }
            n->next = NULL;
            n->tail = n;
            if (h == NULL)
                  h = n;
            else {
                  h->tail->next = n;
                  h->tail = n;
            }
      }
      freeaddrinfo(res0);
      free(ps);

      return (h);
}

/*
 * convert a hostname to a list of addresses and put them in the given buffer.
 * test:
 *    if set to 1, only simple addresses are accepted (no netblock, no "!").
 */
int
append_addr(struct pfr_buffer *b, char *s, int test)
{
      char               *r;
      struct node_host  *h, *n;
      int                rv, not = 0;

      for (r = s; *r == '!'; r++)
            not = !not;
      if ((n = host(r)) == NULL) {
            errno = 0;
            return (-1);
      }
      rv = append_addr_host(b, n, test, not);
      do {
            h = n;
            n = n->next;
            free(h);
      } while (n != NULL);
      return (rv);
}

/*
 * same as previous function, but with a pre-parsed input and the ability
 * to "negate" the result. Does not free the node_host list.
 * not:
 *      setting it to 1 is equivalent to adding "!" in front of parameter s.
 */
int
append_addr_host(struct pfr_buffer *b, struct node_host *n, int test, int not)
{
      int                bits;
      struct pfr_addr          addr;

      do {
            bzero(&addr, sizeof(addr));
            addr.pfra_not = n->not ^ not;
            addr.pfra_af = n->af;
            addr.pfra_net = unmask(&n->addr.v.a.mask, n->af);
            switch (n->af) {
            case AF_INET:
                  addr.pfra_ip4addr.s_addr = n->addr.v.a.addr.addr32[0];
                  bits = 32;
                  break;
            case AF_INET6:
                  memcpy(&addr.pfra_ip6addr, &n->addr.v.a.addr.v6,
                      sizeof(struct in6_addr));
                  bits = 128;
                  break;
            default:
                  errno = EINVAL;
                  return (-1);
            }
            if ((test && (not || addr.pfra_net != bits)) ||
                addr.pfra_net > bits) {
                  errno = EINVAL;
                  return (-1);
            }
            if (pfr_buf_add(b, &addr))
                  return (-1);
      } while ((n = n->next) != NULL);

      return (0);
}

int
pfctl_add_trans(struct pfr_buffer *buf, int rs_num, const char *anchor)
{
      struct pfioc_trans_e trans;

      bzero(&trans, sizeof(trans));
      trans.rs_num = rs_num;
      if (strlcpy(trans.anchor, anchor,
          sizeof(trans.anchor)) >= sizeof(trans.anchor))
            errx(1, "pfctl_add_trans: strlcpy");

      return pfr_buf_add(buf, &trans);
}

u_int32_t
pfctl_get_ticket(struct pfr_buffer *buf, int rs_num, const char *anchor)
{
      struct pfioc_trans_e *p;

      PFRB_FOREACH(p, buf)
            if (rs_num == p->rs_num && !strcmp(anchor, p->anchor))
                  return (p->ticket);
      errx(1, "pfctl_get_ticket: assertion failed");
}

int
pfctl_trans(int dev, struct pfr_buffer *buf, u_long cmd, int from)
{
      struct pfioc_trans trans;

      bzero(&trans, sizeof(trans));
      trans.size = buf->pfrb_size - from;
      trans.esize = sizeof(struct pfioc_trans_e);
      trans.array = ((struct pfioc_trans_e *)buf->pfrb_caddr) + from;
      return ioctl(dev, cmd, &trans);
}

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