New ipfilter files. Preparing for merge of ipfilter 3.3.4.

1 files changed, 795 insertions, 0 deletions

diff --git a/sbin/ipnat/natparse.c b/sbin/ipnat/natparse.c
new file mode 100644
index 00000000000..f20a8704ae5
--- /dev/null
+++ b/sbin/ipnat/natparse.c
@@ -0,0 +1,795 @@
+/* $OpenBSD: natparse.c,v 1.1 1999/12/14 04:17:17 kjell Exp $ */
+/*
+ * Copyright (C) 1993-1998 by Darren Reed.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that this notice is preserved and due credit is given
+ * to the original author and the contributors.
+ */
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <sys/types.h>
+#if !defined(__SVR4) && !defined(__svr4__)
+#include <strings.h>
+#else
+#include <sys/byteorder.h>
+#endif
+#include <sys/time.h>
+#include <sys/param.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stddef.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#if defined(sun) && (defined(__svr4__) || defined(__SVR4))
+# include <sys/ioccom.h>
+# include <sys/sysmacros.h>
+#endif
+#include <netinet/in.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/tcp.h>
+#include <net/if.h>
+#if __FreeBSD_version >= 300000
+# include <net/if_var.h>
+#endif
+#include <netdb.h>
+#include <arpa/nameser.h>
+#include <arpa/inet.h>
+#include <resolv.h>
+#include <ctype.h>
+#include <netinet/ip_fil_compat.h>
+#include <netinet/ip_fil.h>
+#include <netinet/ip_proxy.h>
+#include <netinet/ip_nat.h>
+
+#if	defined(sun) && !SOLARIS2
+# define	STRERROR(x)	sys_errlist[x]
+extern	char	*sys_errlist[];
+#else
+# define	STRERROR(x)	strerror(x)
+#endif
+
+#if !defined(lint)
+static const char sccsid[] ="@(#)ipnat.c	1.9 6/5/96 (C) 1993 Darren Reed";
+static const char rcsid[] = "@(#)$Id: natparse.c,v 1.1 1999/12/14 04:17:17 kjell Exp $";
+#endif
+
+
+#if	SOLARIS
+#define	bzero(a,b)	memset(a,0,b)
+#endif
+
+extern	int	countbits __P((u_32_t));
+extern	u_32_t	hostnum __P((char *, int *, int));
+
+ipnat_t	*natparse __P((char *, int));
+void	printnat __P((ipnat_t *, int, void *));
+void	natparsefile __P((int, char *, int));
+u_32_t	n_hostmask __P((char *));
+u_short	n_portnum __P((char *, char *, int));
+void	nat_setgroupmap __P((struct ipnat *));
+
+#define	OPT_REM		1
+#define	OPT_NODO	2
+#define	OPT_STAT	4
+#define	OPT_LIST	8
+#define	OPT_VERBOSE	16
+#define	OPT_FLUSH	32
+#define	OPT_CLEAR	64
+
+
+void printnat(np, verbose, ptr)
+ipnat_t *np;
+int verbose;
+void *ptr;
+{
+	struct	protoent	*pr;
+	struct	servent	*sv;
+	int	bits;
+
+	switch (np->in_redir)
+	{
+	case NAT_REDIRECT :
+		printf("rdr ");
+		break;
+	case NAT_MAP :
+		printf("map ");
+		break;
+	case NAT_MAPBLK :
+		printf("map-block ");
+		break;
+	case NAT_BIMAP :
+		printf("bimap ");
+		break;
+	default :
+		fprintf(stderr, "unknown value for in_redir: %#x\n",
+			np->in_redir);
+		break;
+	}
+
+	if (np->in_redir == NAT_REDIRECT) {
+		printf("%s ", np->in_ifname);
+		if (np->in_src[0].s_addr || np->in_src[1].s_addr) {
+			printf("from %s",inet_ntoa(np->in_src[0]));
+			bits = countbits(np->in_src[1].s_addr);
+			if (bits != -1)
+				printf("/%d ", bits);
+			else
+				printf("/%s ", inet_ntoa(np->in_src[1]));
+		}
+		printf("%s",inet_ntoa(np->in_out[0]));
+		bits = countbits(np->in_out[1].s_addr);
+		if (bits != -1)
+			printf("/%d ", bits);
+		else
+			printf("/%s ", inet_ntoa(np->in_out[1]));
+		if (np->in_pmin)
+			printf("port %d ", ntohs(np->in_pmin));
+		printf("-> %s", inet_ntoa(np->in_in[0]));
+		if (np->in_pnext)
+			printf(" port %d", ntohs(np->in_pnext));
+		if ((np->in_flags & IPN_TCPUDP) == IPN_TCPUDP)
+			printf(" tcp/udp");
+		else if ((np->in_flags & IPN_TCP) == IPN_TCP)
+			printf(" tcp");
+		else if ((np->in_flags & IPN_UDP) == IPN_UDP)
+			printf(" udp");
+		printf("\n");
+		if (verbose)
+			printf("\t%p %lu %x %u %p %d\n", np->in_ifp,
+			       np->in_space, np->in_flags, np->in_pnext, np,
+			       np->in_use);
+	} else {
+		np->in_nextip.s_addr = htonl(np->in_nextip.s_addr);
+		printf("%s %s/", np->in_ifname, inet_ntoa(np->in_in[0]));
+		bits = countbits(np->in_in[1].s_addr);
+		if (bits != -1)
+			printf("%d ", bits);
+		else
+			printf("%s", inet_ntoa(np->in_in[1]));
+		printf(" -> ");
+		if (np->in_flags & IPN_RANGE) {
+			printf("range %s-", inet_ntoa(np->in_out[0]));
+			printf("%s", inet_ntoa(np->in_out[1]));
+		} else {
+			printf("%s/", inet_ntoa(np->in_out[0]));
+			bits = countbits(np->in_out[1].s_addr);
+			if (bits != -1)
+				printf("%d ", bits);
+			else
+				printf("%s", inet_ntoa(np->in_out[1]));
+		}
+		if (*np->in_plabel) {
+			pr = getprotobynumber(np->in_p);
+			printf(" proxy port");
+			if (np->in_dport != 0) {
+				if (pr != NULL)
+					sv = getservbyport(np->in_dport,
+							   pr->p_name);
+				else
+					sv = getservbyport(np->in_dport, NULL);
+				if (sv != NULL)
+					printf(" %s", sv->s_name);
+				else
+					printf(" %hu", ntohs(np->in_dport));
+			}
+			printf(" %.*s/", (int)sizeof(np->in_plabel),
+				np->in_plabel);
+			if (pr != NULL)
+				fputs(pr->p_name, stdout);
+			else
+				printf("%d", np->in_p);
+		} else if (np->in_redir == NAT_MAPBLK) {
+			printf(" ports %d", np->in_pmin);
+			if (verbose)
+				printf("\n\tip modulous %d", np->in_pmax);
+		} else if (np->in_pmin || np->in_pmax) {
+			printf(" portmap");
+			if (np->in_flags & IPN_AUTOPORTMAP) {
+				printf(" auto");
+				if (verbose)
+					printf(" [%d:%d %d %d]",
+					       ntohs(np->in_pmin),
+					       ntohs(np->in_pmax),
+					       np->in_ippip, np->in_ppip);
+			} else {
+				if ((np->in_flags & IPN_TCPUDP) == IPN_TCPUDP)
+					printf(" tcp/udp");
+				else if (np->in_flags & IPN_TCP)
+					printf(" tcp");
+				else if (np->in_flags & IPN_UDP)
+					printf(" udp");
+				printf(" %d:%d", ntohs(np->in_pmin),
+				       ntohs(np->in_pmax));
+			}
+		}
+		printf("\n");
+		if (verbose) {
+			printf("\tifp %p space %lu nextip %s pnext %d",
+			       np->in_ifp, np->in_space,
+			       inet_ntoa(np->in_nextip), np->in_pnext);
+			printf(" flags %x use %u\n",
+			       np->in_flags, np->in_use);
+		}
+	}
+}
+
+
+void nat_setgroupmap(n)
+ipnat_t *n;
+{
+	if (n->in_outmsk == n->in_inmsk)
+		n->in_ippip = 1;
+	else if (n->in_flags & IPN_AUTOPORTMAP) {
+		n->in_ippip = ~ntohl(n->in_inmsk);
+		if (n->in_outmsk != 0xffffffff)
+			n->in_ippip /= (~ntohl(n->in_outmsk) + 1);
+		n->in_ippip++;
+		if (n->in_ippip == 0)
+			n->in_ippip = 1;
+		n->in_ppip = USABLE_PORTS / n->in_ippip;
+	} else {
+		n->in_space = USABLE_PORTS * ~ntohl(n->in_outmsk);
+		n->in_nip = 0;
+		if (!(n->in_ppip = n->in_pmin))
+			n->in_ppip = 1;
+		n->in_ippip = USABLE_PORTS / n->in_ppip;
+	}
+}
+
+
+
+ipnat_t *natparse(line, linenum)
+char *line;
+int linenum;
+{
+	struct protoent *pr;
+	static ipnat_t ipn;
+	char *s, *t;
+	char *shost, *snetm, *dhost, *proto, *srchost, *srcnetm;
+	char *dnetm = NULL, *dport = NULL, *tport = NULL;
+	int resolved;
+
+	srchost = NULL;
+	srcnetm = NULL;
+
+	bzero((char *)&ipn, sizeof(ipn));
+	if ((s = strchr(line, '\n')))
+		*s = '\0';
+	if ((s = strchr(line, '#')))
+		*s = '\0';
+	if (!*line)
+		return NULL;
+	if (!(s = strtok(line, " \t")))
+		return NULL;
+	if (!strcasecmp(s, "map"))
+		ipn.in_redir = NAT_MAP;
+	else if (!strcasecmp(s, "map-block"))
+		ipn.in_redir = NAT_MAPBLK;
+	else if (!strcasecmp(s, "rdr"))
+		ipn.in_redir = NAT_REDIRECT;
+	else if (!strcasecmp(s, "bimap"))
+		ipn.in_redir = NAT_BIMAP;
+	else {
+		fprintf(stderr, "%d: unknown mapping: \"%s\"\n",
+			linenum, s);
+		return NULL;
+	}
+
+	if (!(s = strtok(NULL, " \t"))) {
+		fprintf(stderr, "%d: missing fields (interface)\n",
+			linenum);
+		return NULL;
+	}
+
+	strncpy(ipn.in_ifname, s, sizeof(ipn.in_ifname) - 1);
+	ipn.in_ifname[sizeof(ipn.in_ifname) - 1] = '\0';
+	if (!(s = strtok(NULL, " \t"))) {
+		fprintf(stderr, "%d: missing fields (%s)\n", linenum, 
+			ipn.in_redir ? "from source | destination" : "source");
+		return NULL;
+	}
+
+	if ((ipn.in_redir == NAT_REDIRECT) && !strcasecmp(s, "from")) {
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (source address)\n",
+				linenum);
+			return NULL;
+		}
+
+		srchost = s;
+		srcnetm = strrchr(srchost, '/');
+
+		if (srcnetm == NULL) {
+			if (!(s = strtok(NULL, " \t"))) {
+				fprintf(stderr,
+				"%d: missing fields (source netmask)\n",
+					linenum);
+				return NULL;
+			}
+
+			if (strcasecmp(s, "netmask")) {
+				fprintf(stderr,
+					"%d: missing fields (netmask)\n",
+					linenum);
+				return NULL;
+			}
+			if (!(s = strtok(NULL, " \t"))) {
+				fprintf(stderr,
+					"%d: missing fields (source netmask)\n",
+					linenum);
+				return NULL;
+			}
+			srcnetm = s;
+		}
+		if (*srcnetm == '/')
+			*srcnetm++ = '\0';
+
+		/* re read the  next word  -- destination */
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (destination)\n", linenum);
+			return NULL;
+		}
+
+	}
+
+	shost = s;
+
+	if (ipn.in_redir == NAT_REDIRECT) {
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (destination port)\n",
+				linenum);
+			return NULL;
+		}
+
+		if (strcasecmp(s, "port")) {
+			fprintf(stderr, "%d: missing fields (port)\n", linenum);
+			return NULL;
+		}
+
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (destination port)\n",
+				linenum);
+			return NULL;
+		}
+
+		dport = s;
+	}
+
+
+	if (!(s = strtok(NULL, " \t"))) {
+		fprintf(stderr, "%d: missing fields (->)\n", linenum);
+		return NULL;
+	}
+	if (!strcmp(s, "->")) {
+		snetm = strrchr(shost, '/');
+		if (!snetm) {
+			fprintf(stderr,
+				"%d: missing fields (%s netmask)\n", linenum,
+				ipn.in_redir ? "destination" : "source");
+			return NULL;
+		}
+	} else {
+		if (strcasecmp(s, "netmask")) {
+			fprintf(stderr, "%d: missing fields (netmask)\n",
+				linenum);
+			return NULL;
+		}
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (%s netmask)\n", linenum,
+				ipn.in_redir ? "destination" : "source");
+			return NULL;
+		}
+		snetm = s;
+	}
+
+	if (!(s = strtok(NULL, " \t"))) {
+		fprintf(stderr, "%d: missing fields (%s)\n",
+			linenum, ipn.in_redir ? "destination":"target");
+		return NULL;
+	}
+
+	if (ipn.in_redir == NAT_MAP) {
+		if (!strcasecmp(s, "range")) {
+			ipn.in_flags |= IPN_RANGE;
+			if (!(s = strtok(NULL, " \t"))) {
+				fprintf(stderr, "%d: missing fields (%s)\n",
+					linenum,
+					ipn.in_redir ? "destination":"target");
+				return NULL;
+			}
+		}
+	}
+	dhost = s;
+
+	if (ipn.in_redir & (NAT_MAP|NAT_MAPBLK)) {
+		if (ipn.in_flags & IPN_RANGE) {
+			dnetm = strrchr(dhost, '-');
+			if (dnetm == NULL) {
+				if (!(s = strtok(NULL, " \t")))
+					dnetm = NULL;
+				else {
+					if (strcmp(s, "-"))
+						s = NULL;
+					else if ((s = strtok(NULL, " \t"))) {
+						dnetm = s;
+					}
+				}
+			} else
+				*dnetm++ = '\0';
+			if (dnetm == NULL || *dnetm == '\0') {
+				fprintf(stderr,
+					"%d: desination range not specified\n",
+					linenum);
+				return NULL;
+			}
+		} else {
+			dnetm = strrchr(dhost, '/');
+			if (dnetm == NULL) {
+				if (!(s = strtok(NULL, " \t")))
+					dnetm = NULL;
+				else if (!strcasecmp(s, "netmask"))
+					if ((s = strtok(NULL, " \t")) != NULL)
+						dnetm = s;
+			}
+			if (dnetm == NULL) {
+				fprintf(stderr,
+					"%d: missing fields (dest netmask)\n",
+					linenum);
+				return NULL;
+			}
+			if (*dnetm == '/')
+				*dnetm++ = '\0';
+		}
+		s = strtok(NULL, " \t");
+	}
+
+	if (ipn.in_redir & NAT_MAPBLK) {
+		if (s && strcasecmp(s, "ports")) {
+			fprintf(stderr,
+				"%d: expected \"ports\" - got \"%s\"\n",
+				linenum, s);
+			return NULL;
+		}
+		if (s != NULL) {
+			if ((s = strtok(NULL, " \t")) == NULL)
+				return NULL;
+			ipn.in_pmin = atoi(s);
+			s = strtok(NULL, " \t");
+		} else
+			ipn.in_pmin = 0;
+	} else if ((ipn.in_redir & NAT_BIMAP) == NAT_REDIRECT) {
+		if (strrchr(dhost, '/') != NULL) {
+			fprintf(stderr, "%d: No netmask supported in %s\n",
+				linenum, "destination host for redirect");
+			return NULL;
+		}
+		/* If it's a in_redir, expect target port */
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (destination port)\n",
+				linenum);
+			return NULL;
+		}
+
+		if (strcasecmp(s, "port")) {
+			fprintf(stderr, "%d: missing fields (port)\n",
+				linenum);
+			return NULL;
+		}
+	  
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing fields (destination port)\n",
+				linenum);
+			return NULL;
+		}
+		tport = s;
+	} 
+	if (dnetm && *dnetm == '/')
+		*dnetm++ = '\0';
+	if (snetm && *snetm == '/')
+		*snetm++ = '\0';
+
+	if (ipn.in_redir & (NAT_MAP|NAT_MAPBLK)) {
+		ipn.in_inip = hostnum(shost, &resolved, linenum);
+		if (resolved == -1)
+			return NULL;
+		ipn.in_inmsk = n_hostmask(snetm);
+		ipn.in_outip = hostnum(dhost, &resolved, linenum);
+		if (resolved == -1)
+			return NULL;
+		if (ipn.in_flags & IPN_RANGE) {
+			ipn.in_outmsk = hostnum(dnetm, &resolved, linenum);
+			if (resolved == -1)
+				return NULL;
+		} else
+			ipn.in_outmsk = n_hostmask(dnetm);
+		if (srchost) {
+			ipn.in_srcip = hostnum(srchost, &resolved, linenum);
+			if (resolved == -1)
+				return NULL;
+		}
+		if (srcnetm)
+			ipn.in_srcmsk = n_hostmask(srcnetm);
+	} else {
+		if (srchost) {
+			ipn.in_srcip = hostnum(srchost, &resolved, linenum);
+			if (resolved == -1)
+				return NULL;
+		}
+		if (srcnetm)
+			ipn.in_srcmsk = n_hostmask(srcnetm);
+		ipn.in_inip = hostnum(dhost, &resolved, linenum);
+		if (resolved == -1)
+			return NULL;
+		ipn.in_inmsk = n_hostmask("255.255.255.255");
+		ipn.in_outip = hostnum(shost, &resolved, linenum);
+		if (resolved == -1)
+			return NULL;
+		ipn.in_outmsk = n_hostmask(snetm);
+		if (!(s = strtok(NULL, " \t"))) {
+			ipn.in_flags = IPN_TCP; /* XXX- TCP only by default */
+			proto = "tcp";
+		} else {
+			if (!strcasecmp(s, "tcp"))
+				ipn.in_flags = IPN_TCP;
+			else if (!strcasecmp(s, "udp"))
+				ipn.in_flags = IPN_UDP;
+			else if (!strcasecmp(s, "tcp/udp"))
+				ipn.in_flags = IPN_TCPUDP;
+			else if (!strcasecmp(s, "tcpudp"))
+				ipn.in_flags = IPN_TCPUDP;
+			else if (!strcasecmp(s, "ip"))
+				ipn.in_flags = IPN_ANY;
+			else {
+				ipn.in_flags = IPN_ANY;
+				if ((pr = getprotobyname(s)))
+					ipn.in_p = pr->p_proto;
+				else
+					ipn.in_p = atoi(s);
+			}
+			proto = s;
+			if ((s = strtok(NULL, " \t"))) {
+				fprintf(stderr,
+				"%d: extra junk at the end of rdr: %s\n",
+					linenum, s);
+				return NULL;
+			}
+		}
+		ipn.in_pmin = n_portnum(dport, proto, linenum);
+		ipn.in_pmax = ipn.in_pmin;
+		ipn.in_pnext = n_portnum(tport, proto, linenum);
+		s = NULL;
+	}
+	ipn.in_inip &= ipn.in_inmsk;
+	if ((ipn.in_flags & IPN_RANGE) == 0)
+		ipn.in_outip &= ipn.in_outmsk;
+	ipn.in_srcip &= ipn.in_srcmsk;
+
+	if ((ipn.in_redir & NAT_MAPBLK) != 0)
+		nat_setgroupmap(&ipn);
+
+	if (!s)
+		return &ipn;
+
+	if (ipn.in_redir == NAT_BIMAP) {
+		fprintf(stderr,
+			"%d: extra words at the end of bimap line: %s\n",
+			linenum, s);
+		return NULL;
+	}
+	if (!strcasecmp(s, "proxy")) {
+		if (!(s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: missing parameter for \"proxy\"\n",
+				linenum);
+			return NULL;
+		}
+		dport = NULL;
+
+		if (!strcasecmp(s, "port")) {
+			if (!(s = strtok(NULL, " \t"))) {
+				fprintf(stderr,
+					"%d: missing parameter for \"port\"\n",
+					linenum);
+				return NULL;
+			}
+
+			dport = s;
+
+			if (!(s = strtok(NULL, " \t"))) {
+				fprintf(stderr,
+					"%d: missing parameter for \"proxy\"\n",
+					linenum);
+				return NULL;
+			}
+		} else {
+			fprintf(stderr,
+				"%d: missing keyword \"port\"\n", linenum);
+			return NULL;
+		}
+		if ((proto = index(s, '/'))) {
+			*proto++ = '\0';
+			if ((pr = getprotobyname(proto)))
+				ipn.in_p = pr->p_proto;
+			else
+				ipn.in_p = atoi(proto);
+			if (dport)
+				ipn.in_dport = n_portnum(dport, proto, linenum);
+		} else {
+			ipn.in_p = 0;
+			if (dport)
+				ipn.in_dport = n_portnum(dport, NULL, linenum);
+		}
+
+		(void) strncpy(ipn.in_plabel, s, sizeof(ipn.in_plabel));
+		if ((s = strtok(NULL, " \t"))) {
+			fprintf(stderr,
+				"%d: too many parameters for \"proxy\"\n",
+				linenum);
+			return NULL;
+		}
+		return &ipn;
+		
+	}
+
+	if (strcasecmp(s, "portmap")) {
+		fprintf(stderr,
+			"%d: expected \"portmap\" - got \"%s\"\n", linenum, s);
+		return NULL;
+	}
+	if (!(s = strtok(NULL, " \t")))
+		return NULL;
+	if (!strcasecmp(s, "tcp"))
+		ipn.in_flags = IPN_TCP;
+	else if (!strcasecmp(s, "udp"))
+		ipn.in_flags = IPN_UDP;
+	else if (!strcasecmp(s, "tcpudp"))
+		ipn.in_flags = IPN_TCPUDP;
+	else if (!strcasecmp(s, "tcp/udp"))
+		ipn.in_flags = IPN_TCPUDP;
+	else {
+		fprintf(stderr,
+			"%d: expected protocol name - got \"%s\"\n",
+			linenum, s);
+		return NULL;
+	}
+
+	if (!(s = strtok(NULL, " \t"))) {
+		fprintf(stderr, "%d: no port range found\n", linenum);
+		return NULL;
+	}
+
+	if (!strcasecmp(s, "auto")) {
+		ipn.in_flags |= IPN_AUTOPORTMAP;
+		ipn.in_pmin = htons(1024);
+		ipn.in_pmax = htons(65535);
+		nat_setgroupmap(&ipn);
+		return &ipn;
+	}
+	proto = s;
+	if (!(t = strchr(s, ':'))) {
+		fprintf(stderr, "%d: no port range in \"%s\"\n", linenum, s);
+		return NULL;
+	}
+	*t++ = '\0';
+	ipn.in_pmin = n_portnum(s, proto, linenum);
+	ipn.in_pmax = n_portnum(t, proto, linenum);
+	return &ipn;
+}
+
+
+void natparsefile(fd, file, opts)
+int fd;
+char *file;
+int opts;
+{
+	char	line[512], *s;
+	ipnat_t	*np;
+	FILE	*fp;
+	int	linenum = 0;
+
+	if (strcmp(file, "-")) {
+		if (!(fp = fopen(file, "r"))) {
+			fprintf(stderr, "%s: open: %s\n", file,
+				STRERROR(errno));
+			exit(1);
+		}
+	} else
+		fp = stdin;
+
+	while (fgets(line, sizeof(line) - 1, fp)) {
+	        linenum++;
+		line[sizeof(line) - 1] = '\0';
+		if ((s = strchr(line, '\n')))
+			*s = '\0';
+
+		if (!(np = natparse(line, linenum))) {
+			if (*line)
+				fprintf(stderr, "%d: syntax error in \"%s\"\n",
+					linenum, line);
+		} else {
+			if ((opts & OPT_VERBOSE) && np)
+				printnat(np, opts &  OPT_VERBOSE, NULL);
+			if (!(opts & OPT_NODO)) {
+				if (!(opts & OPT_REM)) {
+					if (ioctl(fd, SIOCADNAT, np) == -1)
+						perror("ioctl(SIOCADNAT)");
+				} else if (ioctl(fd, SIOCRMNAT, np) == -1)
+					perror("ioctl(SIOCRMNAT)");
+			}
+		}
+	}
+	if (fp != stdin)
+		fclose(fp);
+}
+
+
+u_32_t	n_hostmask(msk)
+char	*msk;
+{
+	int	bits = -1;
+	u_32_t	mask;
+
+	if (!isdigit(*msk))
+		return (u_32_t)-1;
+	if (strchr(msk, '.'))
+		return inet_addr(msk);
+	if (strchr(msk, 'x'))
+		return (u_32_t)strtol(msk, NULL, 0);
+	/*
+	 * set x most significant bits
+	 */
+	for (mask = 0, bits = atoi(msk); bits; bits--) {
+		mask /= 2;
+		mask |= ntohl(inet_addr("128.0.0.0"));
+	}
+	mask = htonl(mask);
+	return mask;
+}
+
+
+u_short	n_portnum(name, proto, linenum)
+char	*name, *proto;
+int     linenum;
+{
+	struct	servent *sp, *sp2;
+	u_short	p1 = 0;
+
+	if (isdigit(*name))
+		return htons((u_short)atoi(name));
+	if (!proto)
+		proto = "tcp/udp";
+	if (strcasecmp(proto, "tcp/udp")) {
+		sp = getservbyname(name, proto);
+		if (sp)
+			return sp->s_port;
+		fprintf(stderr, "%d: unknown service \"%s\".\n", linenum, name);
+		return 0;
+	}
+	sp = getservbyname(name, "tcp");
+	if (sp)
+		p1 = sp->s_port;
+	sp2 = getservbyname(name, "udp");
+	if (!sp || !sp2) {
+		fprintf(stderr, "%d: unknown tcp/udp service \"%s\".\n",
+			linenum, name);
+		return 0;
+	}
+	if (p1 != sp2->s_port) {
+		fprintf(stderr, "%d: %s %d/tcp is a different port to ",
+			linenum, name, p1);
+		fprintf(stderr, "%d: %s %d/udp\n", linenum, name, sp->s_port);
+		return 0;
+	}
+	return p1;
+}