xref: /src/dist/pf/sbin/pfctl/pfctl_parser.c

/*	$NetBSD: pfctl_parser.c,v 1.5 2004/11/14 11:26:48 yamt Exp $	*/
/*	$OpenBSD: pfctl_parser.c,v 1.203 2004/07/16 23:44:25 frantzen 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/types.h>
#include <sys/ioctl.h>
#include <sys/socket.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 <netdb.h>
#include <stdarg.h>
#include <errno.h>
#include <err.h>
#include <ifaddrs.h>
#ifdef __NetBSD__
#include <limits.h>
#endif

#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	*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 },
#ifdef ICMP_ALTHOSTADDR
	{ "althost",	ICMP_ALTHOSTADDR },
#endif
	{ "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 },
#ifdef ICMP_TRACEROUTE
	{ "trace",	ICMP_TRACEROUTE },
#endif
#ifdef ICMP_DATACONVERR
	{ "dataconv",	ICMP_DATACONVERR },
#endif
#ifdef ICMP_MOBILE_REDIRECT
	{ "mobredir",	ICMP_MOBILE_REDIRECT },
#endif
#ifdef ICMP_IPV6_WHEREAREYOU
	{ "ipv6-where",	ICMP_IPV6_WHEREAREYOU },
#endif
#ifdef ICMP_IPV6_IAMHERE
	{ "ipv6-here",	ICMP_IPV6_IAMHERE },
#endif
#ifdef ICMP_MOBILE_REGREQUEST
	{ "mobregreq",	ICMP_MOBILE_REGREQUEST },
#endif
#ifdef ICMP_MOBILE_REGREPLY
	{ "mobregrep",	ICMP_MOBILE_REGREPLY },
#endif
#ifdef ICMP_SKIP
	{ "skip",	ICMP_SKIP },
#endif
#ifdef ICMP_PHOTURIS
	{ "photuris",	ICMP_PHOTURIS }
#endif
};

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 },
#ifdef ICMP_UNREACH_FILTER_PROHIB
	{ "filter-prohib",	ICMP_UNREACH,	ICMP_UNREACH_FILTER_PROHIB },
#endif
#ifdef ICMP_UNREACH_HOST_PRECEDENCE
	{ "host-preced",	ICMP_UNREACH,	ICMP_UNREACH_HOST_PRECEDENCE },
#endif
#ifdef ICMP_UNREACH_PRECEDENCE_CUTOFF
	{ "cutoff-preced",	ICMP_UNREACH,	ICMP_UNREACH_PRECEDENCE_CUTOFF },
#endif
	{ "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 },
#ifdef ICMP_ROUTERADVERT_NORMAL
	{ "normal-adv",		ICMP_ROUTERADVERT, ICMP_ROUTERADVERT_NORMAL },
#endif
#ifdef ICMP_ROUTERADVERT_NOROUTE_COMMON
	{ "common-adv",		ICMP_ROUTERADVERT, ICMP_ROUTERADVERT_NOROUTE_COMMON },
#endif
	{ "transit",		ICMP_TIMXCEED,	ICMP_TIMXCEED_INTRANS },
	{ "reassemb",		ICMP_TIMXCEED,	ICMP_TIMXCEED_REASS },
#ifdef ICMP_PARAMPROB_ERRATPTR
	{ "badhead",		ICMP_PARAMPROB,	ICMP_PARAMPROB_ERRATPTR },
#endif
	{ "optmiss",		ICMP_PARAMPROB,	ICMP_PARAMPROB_OPTABSENT },
#ifdef ICMP_PARAMPROB_LENGTH
	{ "badlen",		ICMP_PARAMPROB,	ICMP_PARAMPROB_LENGTH },
#endif
#ifdef ICMP_PHOTURIS
	{ "unknown-ind",	ICMP_PHOTURIS,	ICMP_PHOTURIS_UNKNOWN_INDEX },
	{ "auth-fail",		ICMP_PHOTURIS,	ICMP_PHOTURIS_AUTH_FAILED },
	{ "decrypt-fail",	ICMP_PHOTURIS,	ICMP_PHOTURIS_DECRYPT_FAILED }
#endif
};

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_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;

	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;
	}
	printf("Hostid: 0x%08x\n\n", ntohl(s->hostid));
	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", "");
	}
}

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(" (%d states)\n", sn->states);
	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(", %u pkts, %u bytes", sn->packets, sn->bytes);
		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", "nat",
	    "no nat", "binat", "no binat", "rdr", "no rdr" };
	static const char *anchortypes[] = { "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])
		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 == 1)
		printf(" log");
	else if (r->log == 2)
		printf(" log-all");
	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);
	}
	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 == 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 | PFRULE_GRBOUND))
		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_nodes) {
			if (!opts)
				printf(", ");
			printf("max-src-nodes %u", r->max_src_nodes);
			opts = 0;
		}
		if (r->rule_flag & PFRULE_IFBOUND) {
			if (!opts)
				printf(", ");
			printf("if-bound");
			opts = 0;
		}
		if (r->rule_flag & PFRULE_GRBOUND) {
			if (!opts)
				printf(", ");
			printf("group-bound");
			opts = 0;
		}
		for (i = 0; i < PFTM_MAX; ++i)
			if (r->timeout[i]) {
				if (!opts)
					printf(", ");
				opts = 0;
				printf("%s %u", pf_timeouts[i].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 (!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);
	}
	printf("\n");
}

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, int group_ok)
{
	struct node_host	*n;

	if (iftab == NULL)
		ifa_load();

	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_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 (!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\n");
			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, 1) || !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);
}