Add userland for the new packet filter.

Code from dhartmei.

4 files changed, 1252 insertions, 0 deletions

diff --git a/usr.sbin/pfm/Makefile b/usr.sbin/pfm/Makefile
new file mode 100644
index 00000000000..971939c08d1
--- /dev/null
+++ b/usr.sbin/pfm/Makefile
@@ -0,0 +1,8 @@
+#
+#	$OpenBSD: Makefile,v 1.1 2001/06/24 20:18:12 kjell Exp $
+
+PROG = pfm 
+SRCS = pfm.c pfm_parser.c
+MAN=
+
+.include <bsd.prog.mk>
diff --git a/usr.sbin/pfm/pfm.c b/usr.sbin/pfm/pfm.c
new file mode 100644
index 00000000000..17cac757d41
--- /dev/null
+++ b/usr.sbin/pfm/pfm.c
@@ -0,0 +1,371 @@
+/*	$OpenBSD: pfm.c,v 1.1 2001/06/24 20:18:12 kjell Exp $ */
+
+/*
+ * Copyright (c) 2001, Daniel Hartmeier
+ * 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
+ * REGENTS 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <netinet/in.h>
+
+#include "pfm_parser.h"
+
+static void	 printerror(char *);
+static void	 usage(char *);
+static char	*load_file(char *, size_t *);
+int		 main(int, char *[]);
+
+static char *errormsg[] = {
+	"invalid operation",		/* ERROR_INVALID_OP */
+	"packetfilter is running",	/* ERROR_ALREADY_RUNNING */
+	"packetfilter not running",	/* ERROR_NOT_RUNNING */
+	"invalid parameters",		/* ERROR_INVALID_PARAMETERS */
+	"memory allocation failed"	/* ERROR_MALLOC */
+};
+
+static void
+printerror(char *s)
+{
+	char *msg;
+	if ((errno >= 100) && (errno < MAX_ERROR_NUM))
+		msg = errormsg[errno-100];
+	else
+		msg = strerror(errno);
+	fprintf(stderr, "ERROR: %s: %s\n", s, msg);
+	return;
+}
+
+static void
+usage(char *argv0)
+{
+	char *n = rindex(argv0, '/');
+	if (n != NULL)
+		n++;
+	else
+		n = argv0;
+	fprintf(stderr, "Usage: %s command argument\n", n);
+	fprintf(stderr, "\tstart\t\t\tStart packet filter\n");
+	fprintf(stderr, "\tstop\t\t\tStop packet filter\n");
+	fprintf(stderr, "\tshow\trules\t\tShow filter rules\n");
+	fprintf(stderr, "\t\tnat\t\t     NAT/RDR rules\n");
+	fprintf(stderr, "\t\tstates [proto]\t     list of active states\n");
+	fprintf(stderr, "\t\tstatus\t\t     status\n");
+	fprintf(stderr, "\tclear\trules\t\tClear filter rules\n");
+	fprintf(stderr, "\t\tnat\t\t      NAT/RDR rules\n");
+	fprintf(stderr, "\t\tstates\t\t      states\n");
+	fprintf(stderr, "\tparse\trules\t<file>\tCheck syntax of filter rules\n");
+	fprintf(stderr, "\t\tnat\t<file>\t                NAT/RDR rules\n");
+	fprintf(stderr, "\tload\trules\t<file>\tLoad filter rules\n");
+	fprintf(stderr, "\t\tnat\t<file>\t     NAT/RDR rules\n");
+	fprintf(stderr, "\tlog\t\t<if>\tSet interface to log\n");
+}
+
+static char *
+load_file(char *name, size_t *len)
+{
+	char *buf = 0;
+	FILE *file = fopen(name, "r");
+	*len = 0;
+	if (file == NULL) {
+		fprintf(stderr, "ERROR: couldn't open file %s (%s)\n",
+		    name, strerror(errno));
+		return 0;
+	}
+	fseek(file, 0, SEEK_END);
+	*len = ftell(file);
+	fseek(file, 0, SEEK_SET);
+	buf = malloc(*len);
+    	if (buf == NULL) {
+		fclose(file);
+		fprintf(stderr, "ERROR: malloc() failed\n");
+		return 0;
+	}
+	if (fread(buf, 1, *len, file) != *len) {
+		free(buf);
+		fclose(file);
+		fprintf(stderr, "ERROR: fread() failed\n");
+		return 0;
+	}
+	fclose(file);
+	return buf;
+}
+
+int
+main(int argc, char *argv[])
+{
+	int dev;
+	struct ioctlbuffer *ub;
+	u_int16_t n = 0;
+	ub = malloc(sizeof(struct ioctlbuffer));
+	if (ub == NULL) {
+		printf("ERROR: malloc() failed\n");
+		return 1;
+	}
+	ub->size = 131072;
+	ub->buffer = malloc(ub->size);
+	if (ub->buffer == NULL) {
+		printf("ERROR: malloc() failed\n");
+		return 1;
+	}
+	memset(ub->buffer, 0, ub->size);
+	ub->entries = 0;
+	if (argc < 2) {
+		usage(argv[0]);
+		return 1;
+	}
+	dev = open("/dev/pf", O_RDWR);
+	if (dev < 0) {
+		printerror("open(/dev/pf)");
+		return 1;
+	}
+	if (!strcmp(argv[1], "start")) {
+		if (ioctl(dev, DIOCSTART))
+			printerror("DIOCSTART");
+		else
+			printf("packetfilter started\n");
+	}
+	else if (!strcmp(argv[1], "stop")) {
+		if (ioctl(dev, DIOCSTOP))
+			printerror("DIOCSTOP");
+		else
+			printf("packetfilter stopped\n");
+	}
+	else if (!strcmp(argv[1], "show")) {
+		if (argc < 3) {
+			close(dev);
+			usage(argv[0]);
+			return 1;
+		}
+		if (!strcmp(argv[2], "rules")) {
+			struct rule *rule = ub->buffer;
+			ub->entries = ub->size / sizeof(struct rule);
+			if (ioctl(dev, DIOCGETRULES, ub))
+				printerror("DIOCGETRULES");
+			for (n = 0; n < ub->entries; ++n) {
+				printf("@%u ", n + 1);
+				print_rule(rule + n);
+			}
+		}
+		else if (!strcmp(argv[2], "nat")) {
+			struct nat *nat = ub->buffer;
+			struct rdr *rdr = ub->buffer;
+			ub->entries = ub->size / sizeof(struct nat);
+			if (ioctl(dev, DIOCGETNAT, ub))
+				printerror("DIOCGETNAT");
+			for (n = 0; n < ub->entries; ++n)
+				print_nat(nat + n);
+			ub->entries = ub->size / sizeof(struct rdr);
+			if (ioctl(dev, DIOCGETRDR, ub))
+				printerror("DIOCGETRDR");
+			for (n = 0; n < ub->entries; ++n)
+				print_rdr(rdr + n);
+		}
+		else if (!strcmp(argv[2], "states")) {
+			u_int8_t proto = 0;
+			struct state *state = ub->buffer;
+			if (argc >= 4) {
+				if (!strcmp(argv[3], "tcp"))
+					proto = IPPROTO_TCP;
+				else if (!strcmp(argv[3], "udp"))
+					proto = IPPROTO_UDP;
+				else if (!strcmp(argv[3], "icmp"))
+					proto = IPPROTO_ICMP;
+				else {
+					close(dev);
+					usage(argv[0]);
+					return 1;
+				}
+			}
+			ub->entries = ub->size / sizeof(struct state);
+			if (ioctl(dev, DIOCGETSTATES, ub))
+				printerror("DIOCGETSTATES");
+			for (n = ub->entries; n > 0; --n)
+				if (!proto || (state[n - 1].proto == proto))
+					print_state(state + n - 1);
+		}
+		else if (!strcmp(argv[2], "status")) {
+			struct status *status = ub->buffer;
+			ub->entries = 1;
+			if (ioctl(dev, DIOCGETSTATUS, ub))
+				printerror("DIOCGETSTATUS");
+			print_status(status);
+		}
+		else {
+			close(dev);
+			usage(argv[0]);
+			return 1;
+		}
+	}
+	else if (!strcmp(argv[1], "clear")) {
+		if (argc < 3) {
+			close(dev);
+			usage(argv[0]);
+			return 1;
+		}
+		ub->entries = 0;
+		if (!strcmp(argv[2], "rules")) {
+			if (ioctl(dev, DIOCSETRULES, ub))
+				printerror("DIOCSETRULES");
+			else printf("rules cleared\n");
+		}
+		else if (!strcmp(argv[2], "nat")) {
+			if (ioctl(dev, DIOCSETNAT, ub))
+				printerror("DIOCSETNAT");
+			else if (ioctl(dev, DIOCSETRDR, ub))
+				printerror("DIOCSETRDR");
+			else printf("nat cleared\n");
+		}
+		else if (!strcmp(argv[2], "states")) {
+			if (ioctl(dev, DIOCCLRSTATES))
+				printerror("DIOCCLRSTATES");
+			else
+				printf("states cleared\n");
+		}
+		else {
+			close(dev);
+			usage(argv[0]);
+			return 1;
+		}
+	}
+	else if (!strcmp(argv[1], "log")) {
+		if (argc < 3) {
+			close(dev);
+			usage(argv[0]);
+			return 1;
+		}
+		strncpy(ub->buffer, argv[2], 16);
+		if (ioctl(dev, DIOCSETSTATUSIF, ub))
+			printerror("DIOCSETSTATUSIF");
+		else
+			printf("now logging %s\n", argv[2]);
+	}
+	else if (!strcmp(argv[1], "parse") || !strcmp(argv[1], "load")) {
+		int load = !strcmp(argv[1], "load");
+		char *buf, *s;
+		size_t len;
+		unsigned nr = 0;
+		if ((argc < 4) || (strcmp(argv[2], "nat") &&
+		    strcmp(argv[2], "rules"))) {
+			close(dev);
+			usage(argv[0]);
+			return 1;
+		}
+		buf = load_file(argv[3], &len);
+		if (buf == NULL)
+			return 1;
+
+		if (!strcmp(argv[2], "rules")) {
+			struct rule *rule = ub->buffer;
+			n = 0;
+			nr = 0;
+			s = buf;
+			do {
+				char *line = next_line(&s);
+				nr++;
+				if (*line && (*line != '#'))
+					if (parse_rule(nr, line, rule + n))
+						n++;
+			} while (s < (buf + len));
+			ub->entries = n;
+			if (load) {
+				if (ioctl(dev, DIOCSETRULES, ub))
+					printerror("DIOCSETRULES");
+				else
+					printf("%u rules loaded\n",
+					    ub->entries);
+			} else
+				for (n = 0; n < ub->entries; ++n)
+					print_rule(rule + n);
+		} else {
+			struct nat *nat = ub->buffer;
+			struct rdr *rdr = ub->buffer;
+			n = 0;
+			nr = 0;
+			s = buf;
+			do {
+				char *line = next_line(&s);
+				nr++;
+				if (*line && (*line == 'n'))
+					if (parse_nat(nr, line, nat + n))
+						n++;
+			} while (s < (buf + len));
+			ub->entries = n;
+			if (load) {
+				if (ioctl(dev, DIOCSETNAT, ub))
+					printerror("DIOCSETNAT");
+				else
+					printf("%u nat entries loaded\n",
+					    ub->entries);
+			} else
+				for (n = 0; n < ub->entries; ++n)
+					print_nat(nat + n);
+			free(buf);
+			buf = load_file(argv[3], &len);
+			if (buf == NULL)
+				return 1;
+			n = 0;
+			nr = 0;
+			s = buf;
+			do {
+				char *line = next_line(&s);
+				nr++;
+				if (*line && (*line == 'r'))
+					if (parse_rdr(nr, line, rdr + n))
+						n++;
+			} while (s < (buf + len));
+			ub->entries = n;
+			if (load) {
+				if (ioctl(dev, DIOCSETRDR, ub))
+					printerror("DIOCSETRDR");
+				else
+					printf("%u rdr entries loaded\n",
+					    ub->entries);
+			} else
+				for (n = 0; n < ub->entries; ++n)
+					print_rdr(rdr + n);
+		}
+
+		free(buf);
+	}
+	else {
+		close(dev);
+		usage(argv[0]);
+		return 1;
+	}
+	close(dev);
+	free(ub->buffer);
+	free(ub);
+	return 0;
+}
+
diff --git a/usr.sbin/pfm/pfm_parser.c b/usr.sbin/pfm/pfm_parser.c
new file mode 100644
index 00000000000..2ad20912a29
--- /dev/null
+++ b/usr.sbin/pfm/pfm_parser.c
@@ -0,0 +1,825 @@
+/*	$OpenBSD: pfm_parser.c,v 1.1 2001/06/24 20:18:12 kjell Exp $ */
+
+/*
+ * Copyright (c) 2001, Daniel Hartmeier
+ * 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
+ * REGENTS 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <netdb.h>
+#include <netinet/in.h>
+
+#include "pfm_parser.h"
+
+static void		 print_addr (u_int32_t);
+static void		 print_host (struct host *);
+static void		 print_seq (struct peer *);
+static void		 print_port (u_int8_t, u_int16_t, u_int16_t, char *);
+static void		 print_flags (u_int8_t);
+static char		*next_word (char **);
+static u_int16_t	 next_number (char **);
+static u_int32_t	 next_addr (char **);
+static u_int8_t		 next_flags (char **);
+static u_int16_t	 rule_port (char *, u_int8_t);
+static u_int32_t	 rule_mask (u_int8_t);
+
+static char *tcpflags = "FSRPAU";
+
+static void
+print_addr(u_int32_t a)
+{
+	a = ntohl(a);
+	printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255, (a>>8)&255, a&255);
+}
+
+static void
+print_host(struct host *h)
+{
+	u_int32_t a = ntohl(h->addr);
+	u_int16_t p = ntohs(h->port);
+	printf("%u.%u.%u.%u:%u", (a>>24)&255, (a>>16)&255, (a>>8)&255, a&255, p);
+}
+
+static void
+print_seq(struct peer *p)
+{
+	printf("[%u + %u]", p->seqlo, p->seqhi - p->seqlo);
+}
+
+static void
+print_port(u_int8_t op, u_int16_t p1, u_int16_t p2, char *proto)
+{
+	struct servent *s = getservbyport(p1, proto);
+	p1 = ntohs(p1);
+	p2 = ntohs(p2);
+	printf("port ");
+	if (op == 1)
+		printf("%u >< %u ", p1, p2);
+	else if (op == 2) {
+		if (s != NULL)
+			printf("= %s ", s->s_name);
+		else
+			printf("= %u ", p1);
+	}
+	else if (op == 3) {
+		if (s != NULL)
+			printf("!= %s ", s->s_name);
+		else
+			printf("!= %u ", p1);
+	}
+	else if (op == 4)
+		printf("< %u ", p1);
+	else if (op == 5)
+		printf("<= %u ", p1);
+	else if (op == 6)
+		printf("> %u ", p1);
+	else
+		printf(">= %u ", p1);
+}
+
+static void
+print_flags(u_int8_t f)
+{
+	int i;
+	for (i = 0; i < 6; ++i)
+		if (f & (1 << i))
+			printf("%c", tcpflags[i]);
+}
+
+void
+print_nat(struct nat *n)
+{
+	printf("nat %s ", n->ifname);
+	if (n->not)
+		printf("! ");
+	print_addr(n->saddr);
+	if (n->smask != 0xFFFFFFFF) {
+		printf("/");
+		print_addr(n->smask);
+	}
+	printf(" -> ");
+	print_addr(n->daddr);
+	switch (n->proto) {
+	case IPPROTO_TCP:
+		printf(" proto tcp");
+		break;
+	case IPPROTO_UDP:
+		printf(" proto udp");
+		break;
+	case IPPROTO_ICMP:
+		printf(" proto icmp");
+		break;
+	}
+	printf("\n");
+}
+
+void
+print_rdr(struct rdr *r)
+{
+	printf("rdr %s ", r->ifname);
+	if (r->not)
+		printf("! ");
+	print_addr(r->daddr);
+	if (r->dmask != 0xFFFFFFFF) {
+		printf("/");
+		print_addr(r->dmask);
+	}
+	printf(" port %u -> ", ntohs(r->dport));
+	print_addr(r->raddr);
+	printf(" port %u", ntohs(r->rport));
+	switch (r->proto) {
+	case IPPROTO_TCP:
+		printf(" proto tcp");
+		break;
+	case IPPROTO_UDP:
+		printf(" proto udp");
+		break;
+	}
+	printf("\n");
+}
+
+void
+print_status(struct status *s)
+{
+	time_t t = time(NULL);
+	printf("%u %u %u", t, s->since, s->running);
+	if (s->running) {
+		printf(" %u %u", s->bytes[0], s->bytes[1]);
+		printf(" %u %u", s->packets[0][0], s->packets[0][1]);
+		printf(" %u %u", s->packets[1][0], s->packets[1][1]);
+		printf(" %u %u %u %u", s->states, s->state_inserts,
+		    s->state_removals, s->state_searches);
+	}
+	printf("\n");
+}
+
+void
+print_state(struct state *s)
+{
+	struct peer *src, *dst;
+	u_int8_t hrs, min, sec;
+	if (s->direction == PF_OUT) {
+		src = &s->src;
+		dst = &s->dst;
+	} else {
+		src = &s->dst;
+		dst = &s->src;
+	}
+	switch (s->proto) {
+	case IPPROTO_TCP:
+		printf("TCP  ");
+		break;
+	case IPPROTO_UDP:
+		printf("UDP  ");
+		break;
+	case IPPROTO_ICMP:
+		printf("ICMP ");
+		break;
+	default:
+		printf("???? ");
+		break;
+	}
+	if ((s->lan.addr != s->gwy.addr) || (s->lan.port != s->gwy.port)) {
+		print_host(&s->lan);
+		if (s->direction == PF_OUT)
+			printf(" -> ");
+		else
+			printf(" <- ");
+	}
+	print_host(&s->gwy);
+	if (s->direction == PF_OUT)
+		printf(" -> ");
+	else
+		printf(" <- ");
+	print_host(&s->ext);
+	printf("\n");
+
+	printf("%u:%u  ", src->state, dst->state);
+	if (s->proto == IPPROTO_TCP) {
+		print_seq(src);
+		printf("    ");
+		print_seq(dst);
+		printf("\n     ");
+	}
+
+	sec = s->creation % 60;
+	s->creation /= 60;
+	min = s->creation % 60;
+	s->creation /= 60;
+	hrs = s->creation;
+	printf("age %.2u:%.2u:%.2u", hrs, min, sec);
+	sec = s->expire % 60;
+	s->expire /= 60;
+	min = s->expire % 60;
+	s->expire /= 60;
+	hrs = s->expire;
+	printf(", expires in %.2u:%.2u:%.2u", hrs, min, sec);
+	printf(", %u pkts, %u bytes\n", s->packets, s->bytes);
+	printf("\n");
+}
+
+void
+print_rule(struct rule *r)
+{
+	if (r->action == 0)
+		printf("pass ");
+	else
+		printf("block ");
+	if (r->action == 2)
+		printf("return-rst ");
+	if (r->direction == 0)
+		printf("in ");
+	else
+		printf("out ");
+	if (r->log)
+		printf("log ");
+	if (r->quick)
+		printf("quick ");
+	if (r->ifname[0])
+		printf("on %s ", r->ifname);
+	if (r->proto) {
+		struct protoent *p = getprotobynumber(r->proto);
+		if (p != NULL)
+			printf("proto %s ", p->p_name);
+		else
+			printf("proto %u ", r->proto);
+	}
+	if (!r->src.addr && !r->src.port_op && !r->dst.addr && !r->dst.port_op)
+		printf("all ");
+	else {
+		printf("from ");
+		if (!r->src.addr)
+			printf("any ");
+		else {
+			if (r->src.not)
+				printf("! ");
+			print_addr(r->src.addr);
+			if (r->src.mask != 0xFFFFFFFF) {
+				printf("/");
+				print_addr(r->src.mask);
+			}
+			printf(" ");
+		}
+		if (r->src.port_op)
+			print_port(r->src.port_op, r->src.port[0],
+			    r->src.port[1], r->proto == 6 ? "tcp" : "udp");
+
+		printf("to ");
+		if (!r->dst.addr)
+			printf("any ");
+		else {
+			if (r->dst.not)
+				printf("! ");
+			print_addr(r->dst.addr);
+			if (r->dst.mask != 0xFFFFFFFF) {
+				printf("/");
+				print_addr(r->dst.mask);
+			}
+			printf(" ");
+		}
+		if (r->dst.port_op)
+			print_port(r->dst.port_op, r->dst.port[0],
+			    r->dst.port[1], r->proto == 6 ? "tcp" : "udp");
+	}
+	if (r->flags || r->flagset) {
+		printf("flags ");
+		print_flags(r->flags);
+		printf("/");
+		print_flags(r->flagset);
+		printf(" ");
+	}
+	if (r->type)
+		printf("icmp-type %u ", r->type-1);
+	if (r->code)
+		printf("code %u ", r->code-1);
+	if (r->keep_state)
+		printf("keep state ");
+	printf("\n");
+}
+
+char *
+next_line(char **s)
+{
+	char *l;
+	l = *s;
+	while (**s && (**s != '\n'))
+		(*s)++;
+	if (**s) {
+		**s = 0;
+		(*s)++;
+	}
+	return l;
+}
+
+static char *
+next_word(char **s)
+{
+	char *w;
+	while ((**s == ' ') || (**s == '\t') || (**s == '\n'))
+		(*s)++;
+	w = *s;
+	while (**s && (**s != ' ') && (**s != '\t') && (**s != '\n'))
+		(*s)++;
+	if (**s) {
+		**s = 0;
+		(*s)++;
+	}
+	return w;
+}
+
+static u_int16_t
+next_number(char **s)
+{
+	u_int16_t n = 0;
+	while (**s && !isdigit(**s))
+		(*s)++;
+	while (**s && isdigit(**s)) {
+		n *= 10;
+		n += **s - '0';
+		(*s)++;
+	}
+	return n;
+}
+
+static u_int32_t
+next_addr(char **w)
+{
+	u_int8_t a, b, c, d;
+	a = next_number(w);
+	b = next_number(w);
+	c = next_number(w);
+	d = next_number(w);
+	return htonl((a << 24) | (b << 16) | (c << 8) | d);
+}
+
+static u_int8_t
+next_flags(char **s)
+{
+	u_int8_t f = 0;
+	char *p;
+	while (**s && !strchr(tcpflags, **s))
+		(*s)++;
+	while (**s && ((p = strchr(tcpflags, **s)) != NULL)) {
+		f |= 1 << (p-tcpflags);
+		(*s)++;
+	}
+	return f ? f : 63;
+}
+
+static u_int16_t
+rule_port(char *w, u_int8_t p)
+{
+	struct servent *s;
+	if (isdigit(*w))
+		return htons(atoi(w));
+	s = getservbyname(w, p == 6 ? "tcp" : "udp");
+	if (s == NULL)
+		return 0;
+	return s->s_port;
+}
+
+static u_int32_t
+rule_mask(u_int8_t b)
+{
+	u_int32_t m = 0;
+	int i;
+	for (i = 31; i > 31-b; --i)
+		m |= (1 << i);
+	return htonl(m);
+}
+
+int
+parse_rule(int n, char *l, struct rule *r)
+{
+	char *w;
+	memset(r, 0, sizeof(struct rule));
+	w = next_word(&l);
+
+	/* pass / block */
+	if (!strcmp(w, "pass" ))
+		r->action = 0;
+	else if (!strcmp(w, "block"))
+		r->action = 1;
+	else {
+		fprintf(stderr, "error on line %i: expected pass/block, got %s\n",
+		    n, w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* return-rst */
+	if ((r->action == 1) && !strcmp(w, "return-rst")) {
+		r->action = 2;
+		w = next_word(&l);
+	}
+
+	/* in / out */
+	if (!strcmp(w, "in" ))
+		r->direction = 0;
+	else if (!strcmp(w, "out"))
+		r->direction = 1;
+	else {
+		fprintf(stderr, "error on line %i: expected in/out, got %s\n",
+		    n, w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* log */
+	if (!strcmp(w, "log")) {
+		r->log = 1;
+		w = next_word(&l);
+	}
+
+	/* quick */
+	if (!strcmp(w, "quick")) {
+		r->quick = 1;
+		w = next_word(&l);
+	}
+
+	/* on <if> */
+	if (!strcmp(w, "on")) {
+		w = next_word(&l);
+		strncpy(r->ifname, w, 16);
+		w = next_word(&l);
+	}
+
+	/* proto tcp/udp/icmp */
+	if (!strcmp(w, "proto")) {
+		struct protoent *p;
+		w = next_word(&l);
+		p = getprotobyname(w);
+		if (p == NULL) {
+			fprintf(stderr, "error on line %i: unknown protocol %s\n",
+			    n, w);
+			return 0;
+		}
+		r->proto = p->p_proto;
+		w = next_word(&l);
+	}
+
+	/* all / from src to dst */
+	if (!strcmp(w, "all" ))
+		w = next_word(&l);
+	else if (!strcmp(w, "from")) {
+		w = next_word(&l);
+
+		/* source address */
+		if (!strcmp(w, "any"))
+			w = next_word(&l);
+		else {
+			if (!strcmp(w, "!")) {
+				r->src.not = 1;
+				w = next_word(&l);
+			}
+			r->src.addr = next_addr(&w);
+			if (!*w)
+				r->src.mask = 0xFFFFFFFF;
+			else if (*w == '/')
+				r->src.mask = rule_mask(next_number(&w));
+			else {
+				fprintf(stderr, "error on line %i: expected /, got '%c'\n", n, *w);
+				return 0;
+			}
+			w = next_word(&l);
+		}
+
+		/* source port */
+		if (((r->proto == 6) || (r->proto == 17)) && !strcmp(w, "port")) {
+			w = next_word(&l);
+			if (!strcmp(w, "=" ))
+				r->src.port_op = 2;
+			else if (!strcmp(w, "!="))
+				r->src.port_op = 3;
+			else if (!strcmp(w, "<" ))
+				r->src.port_op = 4;
+			else if (!strcmp(w, "<="))
+				r->src.port_op = 5;
+			else if (!strcmp(w, ">" ))
+				r->src.port_op = 6;
+			else if (!strcmp(w, ">="))
+				r->src.port_op = 7;
+			else
+				r->src.port_op = 1;
+			if (r->src.port_op != 1)
+				w = next_word(&l);
+			r->src.port[0] = rule_port(w, r->proto);
+			w = next_word(&l);
+			if (r->src.port_op == 1) {
+				if (strcmp(w, "<>") && strcmp(w, "><")) {
+					fprintf(stderr, "error on line %i: expected <>/><, got %s\n", n, w);
+					return 0;
+				}
+				w = next_word(&l);
+				r->src.port[1] = rule_port(w, r->proto);
+				w = next_word(&l);
+			}
+		}
+
+		/* destination address */
+		if (strcmp(w, "to")) {
+			fprintf(stderr, "error on line %i: expected to, got %s\n",
+			    n, w);
+			return 0;
+		}
+		w = next_word(&l);
+		if (!strcmp(w, "any"))
+			w = next_word(&l);
+		else {
+			if (!strcmp(w, "!")) {
+				r->dst.not = 1;
+				w = next_word(&l);
+			}
+			r->dst.addr = next_addr(&w);
+			if (!*w)
+				r->dst.mask = 0xFFFFFFFF;
+			else if (*w == '/')
+				r->dst.mask = rule_mask(next_number(&w));
+			else {
+				fprintf(stderr, "error on line %i: expected /, got '%c'\n", n, *w);
+				return 0;
+			}
+			w = next_word(&l);
+		}
+
+		/* destination port */
+		if (((r->proto == 6) || (r->proto == 17)) && !strcmp(w, "port")) {
+			w = next_word(&l);
+			if (!strcmp(w, "=" ))
+				r->dst.port_op = 2;
+			else if (!strcmp(w, "!="))
+				r->dst.port_op = 3;
+			else if (!strcmp(w, "<" ))
+				r->dst.port_op = 4;
+			else if (!strcmp(w, "<="))
+				r->dst.port_op = 5;
+			else if (!strcmp(w, ">" ))
+				r->dst.port_op = 6;
+			else if (!strcmp(w, ">="))
+				r->dst.port_op = 7;
+			else
+				r->dst.port_op = 1;
+			if (r->dst.port_op != 1)
+				w = next_word(&l);
+			r->dst.port[0] = rule_port(w, r->proto);
+			w = next_word(&l);
+			if (r->dst.port_op == 1) {
+				if (strcmp(w, "<>") && strcmp(w, "><")) {
+					fprintf(stderr, "error on line %i: expected <>/><, got %s\n", n, w);
+					return 0;
+				}
+				w = next_word(&l);
+				r->dst.port[1] = rule_port(w, r->proto);
+				w = next_word(&l);
+			}
+		}
+
+	}
+	else {
+		fprintf(stderr, "error on line %i: expected all/from, got %s\n",
+		    n, w);
+		return 0;
+	}
+
+	/* flags */
+	if (!strcmp(w, "flags")) {
+		if (r->proto != 6) {
+			fprintf(stderr, "error on line %i: flags only valid for proto tcp\n", n);
+			return 0;
+		}
+		else {
+			w = next_word(&l);
+			r->flags = next_flags(&w);
+			r->flagset = next_flags(&w);
+			w = next_word(&l);
+		}
+	}
+
+	/* icmp type/code */
+	if (!strcmp(w, "icmp-type")) {
+		if (r->proto != 1) {
+			fprintf(stderr, "error on line %i: icmp-type only valid for proto icmp\n", n);
+			return 0;
+		}
+		else {
+			w = next_word(&l);
+			r->type = atoi(w)+1;
+			w = next_word(&l);
+			if (!strcmp(w, "code")) {
+				w = next_word(&l);
+				r->code = atoi(w) + 1;
+				w = next_word(&l);
+			}
+		}
+	}
+
+	/* keep */
+	if (!strcmp(w, "keep")) {
+		w = next_word(&l);
+		if (!strcmp(w, "state")) {
+			w = next_word(&l);
+			r->keep_state = 1;
+		}
+		else {
+			fprintf(stderr, "error on line %i: expected state, got %s\n", n, w);
+			return 0;
+		}
+	}
+
+	/* no further options expected */
+	while (*w) {
+		fprintf(stderr, "error on line %i: unexpected %s\n", n, w);
+		w = next_word(&l);
+	}
+
+	return 1;
+}
+
+int
+parse_nat(int n, char *l, struct nat *nat)
+{
+	char *w;
+	memset(nat, 0, sizeof(struct nat));
+	w = next_word(&l);
+
+	/* nat */
+	if (strcmp(w, "nat" )) {
+		fprintf(stderr, "error on line %i: expected nat, got %s\n", n, w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* if */
+	strncpy(nat->ifname, w, 16);
+	w = next_word(&l);
+
+	/* internal addr/mask */
+	if (!strcmp(w, "!")) {
+		nat->not = 1;
+		w = next_word(&l);
+	}
+	nat->saddr = next_addr(&w);
+	if (!*w)
+		nat->smask = 0xFFFFFFFF;
+	else if (*w == '/')
+		nat->smask = rule_mask(next_number(&w));
+	else {
+		fprintf(stderr, "error on line %i: expected /, got '%c'\n", n, *w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* -> */
+	if (strcmp(w, "->")) {
+		fprintf(stderr, "error on line %i: expected ->, got %s\n", n, w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* external addr */
+	nat->daddr = next_addr(&w);
+	w = next_word(&l);
+
+	/* proto */
+	if (!strcmp(w, "proto")) {
+		w = next_word(&l);
+		if (!strcmp(w, "tcp"))
+			nat->proto = IPPROTO_TCP;
+		else if (!strcmp(w, "udp"))
+			nat->proto = IPPROTO_UDP;
+		else if (!strcmp(w, "icmp"))
+			nat->proto = IPPROTO_ICMP;
+		else {
+			fprintf(stderr,
+			 "error on line %i: expected tcp/udp/icmp, got %s\n",
+			    n, w);
+			return 0;
+		}
+		w = next_word(&l);
+	}
+
+	/* no further options expected */
+	while (*w) {
+		fprintf(stderr, "error on line %i: unexpected %s\n", n, w);
+		w = next_word(&l);
+	}
+
+	return 1;
+}
+
+int
+parse_rdr(int n, char *l, struct rdr *rdr)
+{
+	char *w;
+	memset(rdr, 0, sizeof(struct rdr));
+	w = next_word(&l);
+
+	/* rdr */
+	if (strcmp(w, "rdr" )) {
+		fprintf(stderr, "error on line %i: expected rdr, got %s\n", n, w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* if */
+	strncpy(rdr->ifname, w, 16);
+	w = next_word(&l);
+
+	/* external addr/mask */
+	if (!strcmp(w, "!")) {
+		rdr->not = 1;
+		w = next_word(&l);
+	}
+	rdr->daddr = next_addr(&w);
+	if (!*w)
+		rdr->dmask = 0xFFFFFFFF;
+	else if (*w == '/')
+		rdr->dmask = rule_mask(next_number(&w));
+	else {
+		fprintf(stderr, "error on line %i: expected /, got '%c'\n", n, *w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* external port */
+	if (strcmp(w, "port")) {
+		fprintf(stderr, "error on line %i: expected port, got %s\n", n, w);
+		return 0;
+	}
+	w = next_word(&l);
+	rdr->dport = htons(next_number(&w));
+	w = next_word(&l);
+
+	/* -> */
+	if (strcmp(w, "->")) {
+		fprintf(stderr, "error on line %i: expected ->, got %s\n", n, w);
+		return 0;
+	}
+	w = next_word(&l);
+
+	/* internal addr */
+	rdr->raddr = next_addr(&w);
+	w = next_word(&l);
+
+	/* internal port */
+	if (strcmp(w, "port")) {
+		fprintf(stderr, "error on line %i: expected port, got %s\n", n, w);
+		return 0;
+	}
+	w = next_word(&l);
+	rdr->rport = htons(next_number(&w));
+	w = next_word(&l);
+
+	/* proto */
+	if (!strcmp(w, "proto")) {
+		w = next_word(&l);
+		if (!strcmp(w, "tcp"))
+			rdr->proto = IPPROTO_TCP;
+		else if (!strcmp(w, "udp"))
+			rdr->proto = IPPROTO_UDP;
+		else {
+			fprintf(stderr,
+			 "error on line %i: expected tcp/udp, got %s\n",
+			    n, w);
+			return 0;
+		}
+		w = next_word(&l);
+	}
+
+	/* no further options expected */
+	while (*w) {
+		fprintf(stderr, "error on line %i: unexpected %s\n", n, w);
+		w = next_word(&l);
+	}
+
+	return 1;
+}
+
diff --git a/usr.sbin/pfm/pfm_parser.h b/usr.sbin/pfm/pfm_parser.h
new file mode 100644
index 00000000000..95be2c2898c
--- /dev/null
+++ b/usr.sbin/pfm/pfm_parser.h
@@ -0,0 +1,48 @@
+/*	$OpenBSD: pfm_parser.h,v 1.1 2001/06/24 20:18:12 kjell Exp $ */
+
+/*
+ * Copyright (c) 2001, Daniel Hartmeier
+ * 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
+ * REGENTS 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.
+ *
+ */
+
+#ifndef _PFM_PARSER_H_
+#define _PFM_PARSER_H_
+
+#include <net/pfvar.h>
+
+char	*next_line (char **);
+int	 parse_rule (int, char *, struct rule *);
+int	 parse_nat (int, char *, struct nat *);
+int	 parse_rdr (int, char *, struct rdr *);
+void	 print_rule (struct rule *);
+void	 print_nat (struct nat *);
+void	 print_rdr (struct rdr *);
+void	 print_state (struct state *);
+void	 print_status (struct status *);
+
+#endif /* _PFM_PARSER_H_ */