tools/ipnat.c - net/ipfilter - Rivoreo Source Code Repositories

 /*
  * Copyright (C) 1993-2001 by Darren Reed.
  *
  * See the IPFILTER.LICENCE file for details on licencing.
  *
  * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
  */
 #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/file.h>
 #define _KERNEL
 #include <sys/uio.h>
 #undef _KERNEL
 #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>
 #if defined(linux)
 # include <linux/a.out.h>
 #else
 # include <nlist.h>
 #endif
 #include "ipf.h"
 #include "ipl.h"
 #include "kmem.h"

 #ifdef	__hpux
 # define	nlist	nlist64
 #endif

 #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[] = "@(#)$Id$";
 #endif


 #if	SOLARIS
 #define	bzero(a,b)	memset(a,0,b)
 #endif
 int	use_inet6 = 0;
 char	thishost[MAXHOSTNAMELEN];

 extern	char	*optarg;

 void	dostats __P((natstat_t *, int)), flushtable __P((int, int));
 void	usage __P((char *));
 int	main __P((int, char*[]));
 void	showhostmap __P((natstat_t *nsp));
 void	natstat_dead __P((natstat_t *, char *));

 int	opts;

 void usage(name)
 char *name;
 {
 	fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
 	exit(1);
 }


 int main(argc, argv)
 int argc;
 char *argv[];
 {
 	char *file, *core, *kernel;
 	natstat_t ns, *nsp;
 	int fd, c, mode;
 	ipfobj_t obj;

 	fd = -1;
 	opts = 0;
 	nsp = &ns;
 	file = NULL;
 	core = NULL;
 	kernel = NULL;
 	mode = O_RDWR;

 	while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
 		switch (c)
 		{
 		case 'C' :
 			opts |= OPT_CLEAR;
 			break;
 		case 'd' :
 			opts |= OPT_DEBUG;
 			break;
 		case 'f' :
 			file = optarg;
 			break;
 		case 'F' :
 			opts |= OPT_FLUSH;
 			break;
 		case 'h' :
 			opts |=OPT_HITS;
 			break;
 		case 'l' :
 			opts |= OPT_LIST;
 			mode = O_RDONLY;
 			break;
 		case 'M' :
 			core = optarg;
 			break;
 		case 'N' :
 			kernel = optarg;
 			break;
 		case 'n' :
 			opts |= OPT_DONOTHING;
 			mode = O_RDONLY;
 			break;
 		case 'R' :
 			opts |= OPT_NORESOLVE;
 			break;
 		case 'r' :
 			opts |= OPT_REMOVE;
 			break;
 		case 's' :
 			opts |= OPT_STAT;
 			mode = O_RDONLY;
 			break;
 		case 'v' :
 			opts |= OPT_VERBOSE;
 			break;
 		default :
 			usage(argv[0]);
 		}

 	initparse();

 	if ((kernel != NULL) || (core != NULL)) {
 		(void) setgid(getgid());
 		(void) setuid(getuid());
 	}

 	bzero((char *)&ns, sizeof(ns));

 	if ((opts & OPT_DONOTHING) == 0) {
 		if (checkrev(IPL_NAME) == -1) {
 			fprintf(stderr, "User/kernel version check failed\n");
 			exit(1);
 		}
 	}


 	if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
 		if (openkmem(kernel, core) == -1)
 			exit(1);

 		if (((fd = open(IPNAT_NAME, mode)) == -1) &&
 		    ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
 			(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
 				STRERROR(errno));
 			exit(1);
 		}

 		bzero((char *)&obj, sizeof(obj));
 		obj.ipfo_rev = IPFILTER_VERSION;
 		obj.ipfo_size = sizeof(*nsp);
 		obj.ipfo_type = IPFOBJ_NATSTAT;
 		obj.ipfo_ptr = (void *)nsp;
 		if (ioctl(fd, SIOCGNATS, &obj) == -1) {
 			perror("ioctl(SIOCGNATS)");
 			exit(1);
 		}
 		(void) setgid(getgid());
 		(void) setuid(getuid());
 	} else if ((kernel != NULL) || (core != NULL)) {
 		if (openkmem(kernel, core) == -1)
 			exit(1);

 		natstat_dead(nsp, kernel);
 		if (opts & (OPT_LIST|OPT_STAT))
 			dostats(nsp, opts);
 		exit(0);
 	}

 	if (opts & (OPT_FLUSH|OPT_CLEAR))
 		flushtable(fd, opts);
 	if (file) {
 		ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
 	}
 	if (opts & (OPT_LIST|OPT_STAT))
 		dostats(nsp, opts);
 	return 0;
 }


 /*
  * Read NAT statistic information in using a symbol table and memory file
  * rather than doing ioctl's.
  */
 void natstat_dead(nsp, kernel)
 natstat_t *nsp;
 char *kernel;
 {
 	struct nlist nat_nlist[10] = {
 		{ "nat_table" },		/* 0 */
 		{ "nat_list" },
 		{ "maptable" },
 		{ "ipf_nattable_sz" },
 		{ "ipf_natrules_sz" },
 		{ "ipf_rdrrules_sz" },		/* 5 */
 		{ "ipf_hostmap_sz" },
 		{ "nat_instances" },
 		{ "ap_sess_list" },
 		{ NULL }
 	};
 	void *tables[2];

 	if (nlist(kernel, nat_nlist) == -1) {
 		fprintf(stderr, "nlist error\n");
 		return;
 	}

 	/*
 	 * Normally the ioctl copies all of these values into the structure
 	 * for us, before returning it to userland, so here we must copy each
 	 * one in individually.
 	 */
 	kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
 	nsp->ns_table[0] = tables[0];
 	nsp->ns_table[1] = tables[1];

 	kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
 		sizeof(nsp->ns_list));
 	kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
 		sizeof(nsp->ns_maptable));
 	kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
 		sizeof(nsp->ns_nattab_sz));
 	kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
 		sizeof(nsp->ns_rultab_sz));
 	kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
 		sizeof(nsp->ns_rdrtab_sz));
 	kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
 		sizeof(nsp->ns_hostmap_sz));
 	kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
 		sizeof(nsp->ns_instances));
 	kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
 		sizeof(nsp->ns_apslist));
 }


 /*
  * Display NAT statistics.
  */
 void dostats(nsp, opts)
 natstat_t *nsp;
 int opts;
 {
 	nat_t *np, nat;
 	ipnat_t	ipn;

 	/*
 	 * Show statistics ?
 	 */
 	if (opts & OPT_STAT) {
 		printf("mapped\tin\t%lu\tout\t%lu\n",
 			nsp->ns_mapped[0], nsp->ns_mapped[1]);
 		printf("added\t%lu\texpired\t%lu\n",
 			nsp->ns_added, nsp->ns_expire);
 		printf("no memory\t%lu\tbad nat\t%lu\n",
 			nsp->ns_memfail, nsp->ns_badnat);
 		printf("inuse\t%lu\nrules\t%lu\n",
 			nsp->ns_inuse, nsp->ns_rules);
 		printf("wilds\t%u\n", nsp->ns_wilds);
 		if (opts & OPT_VERBOSE)
 			printf("table %p list %p\n",
 				nsp->ns_table, nsp->ns_list);
 	}

 	/*
 	 * Show list of NAT rules and NAT sessions ?
 	 */
 	if (opts & OPT_LIST) {
 		printf("List of active MAP/Redirect filters:\n");
 		while (nsp->ns_list) {
 			if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
 				    sizeof(ipn))) {
 				perror("kmemcpy");
 				break;
 			}
 			if (opts & OPT_HITS)
 				printf("%lu ", ipn.in_hits);
 			printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
 			nsp->ns_list = ipn.in_next;
 		}

 		printf("\nList of active sessions:\n");

 		for (np = nsp->ns_instances; np; np = nat.nat_next) {
 			if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
 				break;
 			printactivenat(&nat, opts);
 			if (nat.nat_aps)
 				printaps(nat.nat_aps, opts);
 		}

 		if (opts & OPT_VERBOSE)
 			showhostmap(nsp);
 	}
 }


 /*
  * Display the active host mapping table.
  */
 void showhostmap(nsp)
 natstat_t *nsp;
 {
 	hostmap_t hm, *hmp, **maptable;
 	u_int hv;

 	printf("\nList of active host mappings:\n");

 	maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
 					nsp->ns_hostmap_sz);
 	if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
 		    sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
 		perror("kmemcpy (maptable)");
 		return;
 	}

 	for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
 		hmp = maptable[hv];

 		while (hmp) {
 			if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
 				perror("kmemcpy (hostmap)");
 				return;
 			}

 			printhostmap(&hm, hv);
 			hmp = hm.hm_next;
 		}
 	}
 	free(maptable);
 }


 /*
  * Issue an ioctl to flush either the NAT rules table or the active mapping
  * table or both.
  */
 void flushtable(fd, opts)
 int fd, opts;
 {
 	int n = 0;

 	if (opts & OPT_FLUSH) {
 		n = 0;
 		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
 			perror("ioctl(SIOCFLNAT)");
 		else
 			printf("%d entries flushed from NAT table\n", n);
 	}

 	if (opts & OPT_CLEAR) {
 		n = 1;
 		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
 			perror("ioctl(SIOCCNATL)");
 		else
 			printf("%d entries flushed from NAT list\n", n);
 	}
 }
	/*
	* Copyright (C) 1993-2001 by Darren Reed.
	*
	* See the IPFILTER.LICENCE file for details on licencing.
	*
	* Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
	*/
	#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/file.h>
	#define _KERNEL
	#include <sys/uio.h>
	#undef _KERNEL
	#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>
	#if defined(linux)
	# include <linux/a.out.h>
	#else
	# include <nlist.h>
	#endif
	#include "ipf.h"
	#include "ipl.h"
	#include "kmem.h"

	#ifdef __hpux
	# define nlist nlist64
	#endif

	#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[] = "@(#)$Id$";
	#endif


	#if SOLARIS
	#define bzero(a,b) memset(a,0,b)
	#endif
	int use_inet6 = 0;
	char thishost[MAXHOSTNAMELEN];

	extern char *optarg;

	void dostats __P((natstat_t *, int)), flushtable __P((int, int));
	void usage __P((char *));
	int main __P((int, char*[]));
	void showhostmap __P((natstat_t *nsp));
	void natstat_dead __P((natstat_t , char ));

	int opts;

	void usage(name)
	char *name;
	{
	fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
	exit(1);
	}


	int main(argc, argv)
	int argc;
	char *argv[];
	{
	char file, core, *kernel;
	natstat_t ns, *nsp;
	int fd, c, mode;
	ipfobj_t obj;

	fd = -1;
	opts = 0;
	nsp = &ns;
	file = NULL;
	core = NULL;
	kernel = NULL;
	mode = O_RDWR;

	while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
	switch (c)
	{
	case 'C' :
	opts \|= OPT_CLEAR;
	break;
	case 'd' :
	opts \|= OPT_DEBUG;
	break;
	case 'f' :
	file = optarg;
	break;
	case 'F' :
	opts \|= OPT_FLUSH;
	break;
	case 'h' :
	opts \|=OPT_HITS;
	break;
	case 'l' :
	opts \|= OPT_LIST;
	mode = O_RDONLY;
	break;
	case 'M' :
	core = optarg;
	break;
	case 'N' :
	kernel = optarg;
	break;
	case 'n' :
	opts \|= OPT_DONOTHING;
	mode = O_RDONLY;
	break;
	case 'R' :
	opts \|= OPT_NORESOLVE;
	break;
	case 'r' :
	opts \|= OPT_REMOVE;
	break;
	case 's' :
	opts \|= OPT_STAT;
	mode = O_RDONLY;
	break;
	case 'v' :
	opts \|= OPT_VERBOSE;
	break;
	default :
	usage(argv[0]);
	}

	initparse();

	if ((kernel != NULL) \|\| (core != NULL)) {
	(void) setgid(getgid());
	(void) setuid(getuid());
	}

	bzero((char *)&ns, sizeof(ns));

	if ((opts & OPT_DONOTHING) == 0) {
	if (checkrev(IPL_NAME) == -1) {
	fprintf(stderr, "User/kernel version check failed\n");
	exit(1);
	}
	}


	if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
	if (openkmem(kernel, core) == -1)
	exit(1);

	if (((fd = open(IPNAT_NAME, mode)) == -1) &&
	((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
	(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
	STRERROR(errno));
	exit(1);
	}

	bzero((char *)&obj, sizeof(obj));
	obj.ipfo_rev = IPFILTER_VERSION;
	obj.ipfo_size = sizeof(*nsp);
	obj.ipfo_type = IPFOBJ_NATSTAT;
	obj.ipfo_ptr = (void *)nsp;
	if (ioctl(fd, SIOCGNATS, &obj) == -1) {
	perror("ioctl(SIOCGNATS)");
	exit(1);
	}
	(void) setgid(getgid());
	(void) setuid(getuid());
	} else if ((kernel != NULL) \|\| (core != NULL)) {
	if (openkmem(kernel, core) == -1)
	exit(1);

	natstat_dead(nsp, kernel);
	if (opts & (OPT_LIST\|OPT_STAT))
	dostats(nsp, opts);
	exit(0);
	}

	if (opts & (OPT_FLUSH\|OPT_CLEAR))
	flushtable(fd, opts);
	if (file) {
	ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
	}
	if (opts & (OPT_LIST\|OPT_STAT))
	dostats(nsp, opts);
	return 0;
	}


	/*
	* Read NAT statistic information in using a symbol table and memory file
	* rather than doing ioctl's.
	*/
	void natstat_dead(nsp, kernel)
	natstat_t *nsp;
	char *kernel;
	{
	struct nlist nat_nlist[10] = {
	{ "nat_table" }, /* 0 */
	{ "nat_list" },
	{ "maptable" },
	{ "ipf_nattable_sz" },
	{ "ipf_natrules_sz" },
	{ "ipf_rdrrules_sz" }, /* 5 */
	{ "ipf_hostmap_sz" },
	{ "nat_instances" },
	{ "ap_sess_list" },
	{ NULL }
	};
	void *tables[2];

	if (nlist(kernel, nat_nlist) == -1) {
	fprintf(stderr, "nlist error\n");
	return;
	}

	/*
	* Normally the ioctl copies all of these values into the structure
	* for us, before returning it to userland, so here we must copy each
	* one in individually.
	*/
	kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
	nsp->ns_table[0] = tables[0];
	nsp->ns_table[1] = tables[1];

	kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
	sizeof(nsp->ns_list));
	kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
	sizeof(nsp->ns_maptable));
	kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
	sizeof(nsp->ns_nattab_sz));
	kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
	sizeof(nsp->ns_rultab_sz));
	kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
	sizeof(nsp->ns_rdrtab_sz));
	kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
	sizeof(nsp->ns_hostmap_sz));
	kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
	sizeof(nsp->ns_instances));
	kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
	sizeof(nsp->ns_apslist));
	}


	/*
	* Display NAT statistics.
	*/
	void dostats(nsp, opts)
	natstat_t *nsp;
	int opts;
	{
	nat_t *np, nat;
	ipnat_t ipn;

	/*
	* Show statistics ?
	*/
	if (opts & OPT_STAT) {
	printf("mapped\tin\t%lu\tout\t%lu\n",
	nsp->ns_mapped[0], nsp->ns_mapped[1]);
	printf("added\t%lu\texpired\t%lu\n",
	nsp->ns_added, nsp->ns_expire);
	printf("no memory\t%lu\tbad nat\t%lu\n",
	nsp->ns_memfail, nsp->ns_badnat);
	printf("inuse\t%lu\nrules\t%lu\n",
	nsp->ns_inuse, nsp->ns_rules);
	printf("wilds\t%u\n", nsp->ns_wilds);
	if (opts & OPT_VERBOSE)
	printf("table %p list %p\n",
	nsp->ns_table, nsp->ns_list);
	}

	/*
	* Show list of NAT rules and NAT sessions ?
	*/
	if (opts & OPT_LIST) {
	printf("List of active MAP/Redirect filters:\n");
	while (nsp->ns_list) {
	if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
	sizeof(ipn))) {
	perror("kmemcpy");
	break;
	}
	if (opts & OPT_HITS)
	printf("%lu ", ipn.in_hits);
	printnat(&ipn, opts & (OPT_DEBUG\|OPT_VERBOSE));
	nsp->ns_list = ipn.in_next;
	}

	printf("\nList of active sessions:\n");

	for (np = nsp->ns_instances; np; np = nat.nat_next) {
	if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
	break;
	printactivenat(&nat, opts);
	if (nat.nat_aps)
	printaps(nat.nat_aps, opts);
	}

	if (opts & OPT_VERBOSE)
	showhostmap(nsp);
	}
	}


	/*
	* Display the active host mapping table.
	*/
	void showhostmap(nsp)
	natstat_t *nsp;
	{
	hostmap_t hm, hmp, *maptable;
	u_int hv;

	printf("\nList of active host mappings:\n");

	maptable = (hostmap_t *)malloc(sizeof(hostmap_t ) *
	nsp->ns_hostmap_sz);
	if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
	sizeof(hostmap_t ) nsp->ns_hostmap_sz)) {
	perror("kmemcpy (maptable)");
	return;
	}

	for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
	hmp = maptable[hv];

	while (hmp) {
	if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
	perror("kmemcpy (hostmap)");
	return;
	}

	printhostmap(&hm, hv);
	hmp = hm.hm_next;
	}
	}
	free(maptable);
	}


	/*
	* Issue an ioctl to flush either the NAT rules table or the active mapping
	* table or both.
	*/
	void flushtable(fd, opts)
	int fd, opts;
	{
	int n = 0;

	if (opts & OPT_FLUSH) {
	n = 0;
	if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
	perror("ioctl(SIOCFLNAT)");
	else
	printf("%d entries flushed from NAT table\n", n);
	}

	if (opts & OPT_CLEAR) {
	n = 1;
	if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
	perror("ioctl(SIOCCNATL)");
	else
	printf("%d entries flushed from NAT list\n", n);
	}
	}