ipnat.c revision 145511 
1/*	$NetBSD$	*/
2
3/*
4 * Copyright (C) 1993-2001 by Darren Reed.
5 *
6 * See the IPFILTER.LICENCE file for details on licencing.
7 *
8 * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
9 */
10#include <stdio.h>
11#include <string.h>
12#include <fcntl.h>
13#include <errno.h>
14#include <sys/types.h>
15#if !defined(__SVR4) && !defined(__svr4__)
16#include <strings.h>
17#else
18#include <sys/byteorder.h>
19#endif
20#include <sys/time.h>
21#include <sys/param.h>
22#include <stdlib.h>
23#include <unistd.h>
24#include <stddef.h>
25#include <sys/file.h>
26#define _KERNEL
27#include <sys/uio.h>
28#undef _KERNEL
29#include <sys/socket.h>
30#include <sys/ioctl.h>
31#if defined(sun) && (defined(__svr4__) || defined(__SVR4))
32# include <sys/ioccom.h>
33# include <sys/sysmacros.h>
34#endif
35#include <netinet/in.h>
36#include <netinet/in_systm.h>
37#include <netinet/ip.h>
38#include <netinet/tcp.h>
39#include <net/if.h>
40#if __FreeBSD_version >= 300000
41# include <net/if_var.h>
42#endif
43#include <netdb.h>
44#include <arpa/nameser.h>
45#include <arpa/inet.h>
46#include <resolv.h>
47#include <ctype.h>
48#if defined(linux)
49# include <linux/a.out.h>
50#else
51# include <nlist.h>
52#endif
53#include "ipf.h"
54#include "ipl.h"
55#include "kmem.h"
56
57#ifdef	__hpux
58# define	nlist	nlist64
59#endif
60
61#if	defined(sun) && !SOLARIS2
62# define	STRERROR(x)	sys_errlist[x]
63extern	char	*sys_errlist[];
64#else
65# define	STRERROR(x)	strerror(x)
66#endif
67
68#if !defined(lint)
69static const char sccsid[] ="@(#)ipnat.c	1.9 6/5/96 (C) 1993 Darren Reed";
70static const char rcsid[] = "@(#)Id: ipnat.c,v 1.24.2.1 2004/04/28 17:56:22 darrenr Exp";
71#endif
72
73
74#if	SOLARIS
75#define	bzero(a,b)	memset(a,0,b)
76#endif
77int	use_inet6 = 0;
78char	thishost[MAXHOSTNAMELEN];
79
80extern	char	*optarg;
81
82void	dostats __P((natstat_t *, int)), flushtable __P((int, int));
83void	usage __P((char *));
84int	main __P((int, char*[]));
85void	showhostmap __P((natstat_t *nsp));
86void	natstat_dead __P((natstat_t *, char *));
87
88int	opts;
89
90void usage(name)
91char *name;
92{
93	fprintf(stderr, "Usage: %s [-CFhlnrRsv] [-f filename]\n", name);
94	exit(1);
95}
96
97
98int main(argc, argv)
99int argc;
100char *argv[];
101{
102	char *file, *core, *kernel;
103	natstat_t ns, *nsp;
104	int fd, c, mode;
105	ipfobj_t obj;
106
107	fd = -1;
108	opts = 0;
109	nsp = &ns;
110	file = NULL;
111	core = NULL;
112	kernel = NULL;
113	mode = O_RDWR;
114
115	while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
116		switch (c)
117		{
118		case 'C' :
119			opts |= OPT_CLEAR;
120			break;
121		case 'd' :
122			opts |= OPT_DEBUG;
123			break;
124		case 'f' :
125			file = optarg;
126			break;
127		case 'F' :
128			opts |= OPT_FLUSH;
129			break;
130		case 'h' :
131			opts |=OPT_HITS;
132			break;
133		case 'l' :
134			opts |= OPT_LIST;
135			mode = O_RDONLY;
136			break;
137		case 'M' :
138			core = optarg;
139			break;
140		case 'N' :
141			kernel = optarg;
142			break;
143		case 'n' :
144			opts |= OPT_DONOTHING;
145			mode = O_RDONLY;
146			break;
147		case 'R' :
148			opts |= OPT_NORESOLVE;
149			break;
150		case 'r' :
151			opts |= OPT_REMOVE;
152			break;
153		case 's' :
154			opts |= OPT_STAT;
155			mode = O_RDONLY;
156			break;
157		case 'v' :
158			opts |= OPT_VERBOSE;
159			break;
160		default :
161			usage(argv[0]);
162		}
163
164	initparse();
165
166	if ((kernel != NULL) || (core != NULL)) {
167		(void) setgid(getgid());
168		(void) setuid(getuid());
169	}
170
171	bzero((char *)&ns, sizeof(ns));
172
173	if ((opts & OPT_DONOTHING) == 0) {
174		if (checkrev(IPL_NAME) == -1) {
175			fprintf(stderr, "User/kernel version check failed\n");
176			exit(1);
177		}
178	}
179
180
181	if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
182		if (openkmem(kernel, core) == -1)
183			exit(1);
184
185		if (((fd = open(IPNAT_NAME, mode)) == -1) &&
186		    ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
187			(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
188				STRERROR(errno));
189			exit(1);
190		}
191
192		bzero((char *)&obj, sizeof(obj));
193		obj.ipfo_rev = IPFILTER_VERSION;
194		obj.ipfo_size = sizeof(*nsp);
195		obj.ipfo_type = IPFOBJ_NATSTAT;
196		obj.ipfo_ptr = (void *)nsp;
197		if (ioctl(fd, SIOCGNATS, &obj) == -1) {
198			perror("ioctl(SIOCGNATS)");
199			exit(1);
200		}
201		(void) setgid(getgid());
202		(void) setuid(getuid());
203	} else if ((kernel != NULL) || (core != NULL)) {
204		if (openkmem(kernel, core) == -1)
205			exit(1);
206
207		natstat_dead(nsp, kernel);
208		if (opts & (OPT_LIST|OPT_STAT))
209			dostats(nsp, opts);
210		exit(0);
211	}
212
213	if (opts & (OPT_FLUSH|OPT_CLEAR))
214		flushtable(fd, opts);
215	if (file) {
216		ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
217	}
218	if (opts & (OPT_LIST|OPT_STAT))
219		dostats(nsp, opts);
220	return 0;
221}
222
223
224/*
225 * Read NAT statistic information in using a symbol table and memory file
226 * rather than doing ioctl's.
227 */
228void natstat_dead(nsp, kernel)
229natstat_t *nsp;
230char *kernel;
231{
232	struct nlist nat_nlist[10] = {
233		{ "nat_table" },		/* 0 */
234		{ "nat_list" },
235		{ "maptable" },
236		{ "ipf_nattable_sz" },
237		{ "ipf_natrules_sz" },
238		{ "ipf_rdrrules_sz" },		/* 5 */
239		{ "ipf_hostmap_sz" },
240		{ "nat_instances" },
241		{ "ap_sess_list" },
242		{ NULL }
243	};
244	void *tables[2];
245
246	if (nlist(kernel, nat_nlist) == -1) {
247		fprintf(stderr, "nlist error\n");
248		return;
249	}
250
251	/*
252	 * Normally the ioctl copies all of these values into the structure
253	 * for us, before returning it to userland, so here we must copy each
254	 * one in individually.
255	 */
256	kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
257	nsp->ns_table[0] = tables[0];
258	nsp->ns_table[1] = tables[1];
259
260	kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
261		sizeof(nsp->ns_list));
262	kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
263		sizeof(nsp->ns_maptable));
264	kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
265		sizeof(nsp->ns_nattab_sz));
266	kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
267		sizeof(nsp->ns_rultab_sz));
268	kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
269		sizeof(nsp->ns_rdrtab_sz));
270	kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
271		sizeof(nsp->ns_hostmap_sz));
272	kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
273		sizeof(nsp->ns_instances));
274	kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
275		sizeof(nsp->ns_apslist));
276}
277
278
279/*
280 * Display NAT statistics.
281 */
282void dostats(nsp, opts)
283natstat_t *nsp;
284int opts;
285{
286	nat_t *np, nat;
287	ipnat_t	ipn;
288
289	/*
290	 * Show statistics ?
291	 */
292	if (opts & OPT_STAT) {
293		printf("mapped\tin\t%lu\tout\t%lu\n",
294			nsp->ns_mapped[0], nsp->ns_mapped[1]);
295		printf("added\t%lu\texpired\t%lu\n",
296			nsp->ns_added, nsp->ns_expire);
297		printf("no memory\t%lu\tbad nat\t%lu\n",
298			nsp->ns_memfail, nsp->ns_badnat);
299		printf("inuse\t%lu\nrules\t%lu\n",
300			nsp->ns_inuse, nsp->ns_rules);
301		printf("wilds\t%u\n", nsp->ns_wilds);
302		if (opts & OPT_VERBOSE)
303			printf("table %p list %p\n",
304				nsp->ns_table, nsp->ns_list);
305	}
306
307	/*
308	 * Show list of NAT rules and NAT sessions ?
309	 */
310	if (opts & OPT_LIST) {
311		printf("List of active MAP/Redirect filters:\n");
312		while (nsp->ns_list) {
313			if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
314				    sizeof(ipn))) {
315				perror("kmemcpy");
316				break;
317			}
318			if (opts & OPT_HITS)
319				printf("%lu ", ipn.in_hits);
320			printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
321			nsp->ns_list = ipn.in_next;
322		}
323
324		printf("\nList of active sessions:\n");
325
326		for (np = nsp->ns_instances; np; np = nat.nat_next) {
327			if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
328				break;
329			printactivenat(&nat, opts);
330			if (nat.nat_aps)
331				printaps(nat.nat_aps, opts);
332		}
333
334		if (opts & OPT_VERBOSE)
335			showhostmap(nsp);
336	}
337}
338
339
340/*
341 * Display the active host mapping table.
342 */
343void showhostmap(nsp)
344natstat_t *nsp;
345{
346	hostmap_t hm, *hmp, **maptable;
347	u_int hv;
348
349	printf("\nList of active host mappings:\n");
350
351	maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
352					nsp->ns_hostmap_sz);
353	if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
354		    sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
355		perror("kmemcpy (maptable)");
356		return;
357	}
358
359	for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
360		hmp = maptable[hv];
361
362		while (hmp) {
363			if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
364				perror("kmemcpy (hostmap)");
365				return;
366			}
367
368			printhostmap(&hm, hv);
369			hmp = hm.hm_next;
370		}
371	}
372	free(maptable);
373}
374
375
376/*
377 * Issue an ioctl to flush either the NAT rules table or the active mapping
378 * table or both.
379 */
380void flushtable(fd, opts)
381int fd, opts;
382{
383	int n = 0;
384
385	if (opts & OPT_FLUSH) {
386		n = 0;
387		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
388			perror("ioctl(SIOCFLNAT)");
389		else
390			printf("%d entries flushed from NAT table\n", n);
391	}
392
393	if (opts & OPT_CLEAR) {
394		n = 1;
395		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
396			perror("ioctl(SIOCCNATL)");
397		else
398			printf("%d entries flushed from NAT list\n", n);
399	}
400}
401