xref: /illumos-gate/usr/src/cmd/ipf/tools/ipnat.c (revision ea8244dc)
1 /*
2  * Copyright (C) 1993-2001 by Darren Reed.
3  *
4  * See the IPFILTER.LICENCE file for details on licencing.
5  *
6  * Added redirect stuff and a variety of bug fixes. (mcn@EnGarde.com)
7  *
8  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
9  * Use is subject to license terms.
10  */
11 
12 #include <stdio.h>
13 #include <string.h>
14 #include <fcntl.h>
15 #include <errno.h>
16 #include <sys/types.h>
17 #if !defined(__SVR4) && !defined(__svr4__)
18 #include <strings.h>
19 #else
20 #include <sys/byteorder.h>
21 #endif
22 #include <sys/time.h>
23 #include <sys/param.h>
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <stddef.h>
27 #include <sys/file.h>
28 #define _KERNEL
29 #include <sys/uio.h>
30 #undef _KERNEL
31 #include <sys/socket.h>
32 #include <sys/ioctl.h>
33 #if defined(sun) && (defined(__svr4__) || defined(__SVR4))
34 # include <sys/ioccom.h>
35 # include <sys/sysmacros.h>
36 #endif
37 #include <netinet/in.h>
38 #include <netinet/in_systm.h>
39 #include <netinet/ip.h>
40 #include <netinet/tcp.h>
41 #include <net/if.h>
42 #if __FreeBSD_version >= 300000
43 # include <net/if_var.h>
44 #endif
45 #include <netdb.h>
46 #include <arpa/nameser.h>
47 #include <arpa/inet.h>
48 #include <resolv.h>
49 #include <ctype.h>
50 #if defined(linux)
51 # include <linux/a.out.h>
52 #else
53 # include <nlist.h>
54 #endif
55 #include "ipf.h"
56 #include "netinet/ipl.h"
57 #include "kmem.h"
58 
59 #ifdef	__hpux
60 # define	nlist	nlist64
61 #endif
62 
63 #if	defined(sun) && !SOLARIS2
64 # define	STRERROR(x)	sys_errlist[x]
65 extern	char	*sys_errlist[];
66 #else
67 # define	STRERROR(x)	strerror(x)
68 #endif
69 
70 #if !defined(lint)
71 static const char sccsid[] ="@(#)ipnat.c	1.9 6/5/96 (C) 1993 Darren Reed";
72 static const char rcsid[] = "@(#)$Id: ipnat.c,v 1.24.2.2 2005/05/10 21:19:30 darrenr Exp $";
73 #endif
74 
75 
76 #if	SOLARIS
77 #define	bzero(a,b)	memset(a,0,b)
78 #endif
79 int	use_inet6 = 0;
80 char	thishost[MAXHOSTNAMELEN];
81 
82 extern	char	*optarg;
83 
84 void	dostats __P((int, natstat_t *, int, int));
85 void	flushtable __P((int, int));
86 void	usage __P((char *));
87 int	main __P((int, char*[]));
88 void	showhostmap __P((natstat_t *nsp));
89 void	natstat_dead __P((natstat_t *, char *));
90 void	dostats_live __P((int, natstat_t *, int));
91 void	showhostmap_live __P((int, natstat_t *));
92 
93 int	opts;
94 
95 void usage(name)
96 char *name;
97 {
98 	fprintf(stderr, "Usage: %s [-CdFhlnrRsv] [-f filename]\n", name);
99 	exit(1);
100 }
101 
102 
103 int main(argc, argv)
104 int argc;
105 char *argv[];
106 {
107 	char *file, *core, *kernel;
108 	natstat_t ns, *nsp;
109 	int fd, c, mode;
110 	ipfobj_t obj;
111 
112 	fd = -1;
113 	opts = 0;
114 	nsp = &ns;
115 	file = NULL;
116 	core = NULL;
117 	kernel = NULL;
118 	mode = O_RDWR;
119 
120 	while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1)
121 		switch (c)
122 		{
123 		case 'C' :
124 			opts |= OPT_CLEAR;
125 			break;
126 		case 'd' :
127 			opts |= OPT_DEBUG;
128 			break;
129 		case 'f' :
130 			file = optarg;
131 			break;
132 		case 'F' :
133 			opts |= OPT_FLUSH;
134 			break;
135 		case 'h' :
136 			opts |=OPT_HITS;
137 			break;
138 		case 'l' :
139 			opts |= OPT_LIST;
140 			mode = O_RDONLY;
141 			break;
142 		case 'M' :
143 			core = optarg;
144 			break;
145 		case 'N' :
146 			kernel = optarg;
147 			break;
148 		case 'n' :
149 			opts |= OPT_DONOTHING;
150 			mode = O_RDONLY;
151 			break;
152 		case 'R' :
153 			opts |= OPT_NORESOLVE;
154 			break;
155 		case 'r' :
156 			opts |= OPT_REMOVE;
157 			break;
158 		case 's' :
159 			opts |= OPT_STAT;
160 			mode = O_RDONLY;
161 			break;
162 		case 'v' :
163 			opts |= OPT_VERBOSE;
164 			break;
165 		default :
166 			usage(argv[0]);
167 		}
168 
169 	initparse();
170 
171 	if ((kernel != NULL) || (core != NULL)) {
172 		(void) setgid(getgid());
173 		(void) setreuid(getuid(), getuid());
174 	}
175 
176 	bzero((char *)&ns, sizeof(ns));
177 
178 	if ((opts & OPT_DONOTHING) == 0) {
179 		if (checkrev(IPL_NAME) == -1) {
180 			fprintf(stderr, "User/kernel version check failed\n");
181 			exit(1);
182 		}
183 	}
184 
185 
186 	if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) {
187 #ifdef notdef
188 		if (openkmem(kernel, core) == -1)
189 			exit(1);
190 #endif
191 		if (((fd = open(IPNAT_NAME, mode)) == -1) &&
192 		    ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) {
193 			(void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME,
194 				STRERROR(errno));
195 			exit(1);
196 		}
197 
198 		bzero((char *)&obj, sizeof(obj));
199 		obj.ipfo_rev = IPFILTER_VERSION;
200 		obj.ipfo_size = sizeof(*nsp);
201 		obj.ipfo_type = IPFOBJ_NATSTAT;
202 		obj.ipfo_ptr = (void *)nsp;
203 		if (ioctl(fd, SIOCGNATS, &obj) == -1) {
204 			perror("ioctl(SIOCGNATS)");
205 			exit(1);
206 		}
207 		(void) setgid(getgid());
208 		(void) setreuid(getuid(), getuid());
209 	} else if ((kernel != NULL) || (core != NULL)) {
210 		if (openkmem(kernel, core) == -1)
211 			exit(1);
212 
213 		natstat_dead(nsp, kernel);
214 		if (opts & (OPT_LIST|OPT_STAT))
215 			dostats(fd, nsp, opts, 0);
216 		exit(0);
217 	}
218 
219 	if (opts & (OPT_FLUSH|OPT_CLEAR))
220 		flushtable(fd, opts);
221 	if (file) {
222 		ipnat_parsefile(fd, ipnat_addrule, ioctl, file);
223 	}
224 	if (opts & (OPT_LIST|OPT_STAT))
225 		dostats(fd, nsp, opts, 1);
226 	return 0;
227 }
228 
229 
230 /*
231  * Read NAT statistic information in using a symbol table and memory file
232  * rather than doing ioctl's.
233  */
234 void natstat_dead(nsp, kernel)
235 natstat_t *nsp;
236 char *kernel;
237 {
238 	struct nlist nat_nlist[10] = {
239 		{ "nat_table" },		/* 0 */
240 		{ "nat_list" },
241 		{ "maptable" },
242 		{ "ipf_nattable_sz" },
243 		{ "ipf_natrules_sz" },
244 		{ "ipf_rdrrules_sz" },		/* 5 */
245 		{ "ipf_hostmap_sz" },
246 		{ "nat_instances" },
247 		{ "ap_sess_list" },
248 		{ NULL }
249 	};
250 	void *tables[2];
251 
252 	if (nlist(kernel, nat_nlist) == -1) {
253 		fprintf(stderr, "nlist error\n");
254 		return;
255 	}
256 
257 	/*
258 	 * Normally the ioctl copies all of these values into the structure
259 	 * for us, before returning it to userland, so here we must copy each
260 	 * one in individually.
261 	 */
262 	kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables));
263 	nsp->ns_table[0] = tables[0];
264 	nsp->ns_table[1] = tables[1];
265 
266 	kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value,
267 		sizeof(nsp->ns_list));
268 	kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value,
269 		sizeof(nsp->ns_maptable));
270 	kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value,
271 		sizeof(nsp->ns_nattab_sz));
272 	kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value,
273 		sizeof(nsp->ns_rultab_sz));
274 	kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value,
275 		sizeof(nsp->ns_rdrtab_sz));
276 	kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value,
277 		sizeof(nsp->ns_hostmap_sz));
278 	kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value,
279 		sizeof(nsp->ns_instances));
280 	kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value,
281 		sizeof(nsp->ns_apslist));
282 }
283 
284 
285 /*
286  * Display NAT statistics.
287  */
288 void dostats(fd, nsp, opts, alive)
289 natstat_t *nsp;
290 int fd, opts, alive;
291 {
292 	nat_t *np, nat;
293 	ipnat_t	ipn;
294 
295 	/*
296 	 * Show statistics ?
297 	 */
298 	if (opts & OPT_STAT) {
299 		printf("mapped\tin\t%lu\tout\t%lu\n",
300 			nsp->ns_mapped[0], nsp->ns_mapped[1]);
301 		printf("added\t%lu\texpired\t%lu\n",
302 			nsp->ns_added, nsp->ns_expire);
303 		printf("no memory\t%lu\tbad nat\t%lu\n",
304 			nsp->ns_memfail, nsp->ns_badnat);
305 		printf("inuse\t%lu\norphans\t%u\nrules\t%lu\n",
306 			nsp->ns_inuse, nsp->ns_orphans, nsp->ns_rules);
307 		printf("wilds\t%u\n", nsp->ns_wilds);
308 		if (opts & OPT_VERBOSE)
309 			printf("table %p list %p\n",
310 				nsp->ns_table, nsp->ns_list);
311 	}
312 
313 	/*
314 	 * Show list of NAT rules and NAT sessions ?
315 	 */
316 	if (opts & OPT_LIST) {
317 		if (alive) {
318 			dostats_live(fd, nsp, opts);
319 			return;
320 		}
321 		printf("List of active MAP/Redirect filters:\n");
322 		while (nsp->ns_list) {
323 			if (kmemcpy((char *)&ipn, (long)nsp->ns_list,
324 				    sizeof(ipn))) {
325 				perror("kmemcpy");
326 				break;
327 			}
328 			if (opts & OPT_HITS)
329 				printf("%lu ", ipn.in_hits);
330 			printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
331 			nsp->ns_list = ipn.in_next;
332 		}
333 
334 		printf("\nList of active sessions:\n");
335 
336 		for (np = nsp->ns_instances; np; np = nat.nat_next) {
337 			if (kmemcpy((char *)&nat, (long)np, sizeof(nat)))
338 				break;
339 			printactivenat(&nat, opts, 0);
340 			if (nat.nat_aps)
341 				printaps(nat.nat_aps, opts);
342 		}
343 
344 		if (opts & OPT_VERBOSE)
345 			showhostmap(nsp);
346 	}
347 }
348 
349 
350 /*
351  * Display the active host mapping table.
352  */
353 void showhostmap(nsp)
354 natstat_t *nsp;
355 {
356 	hostmap_t hm, *hmp, **maptable;
357 	u_int hv;
358 
359 	printf("\nList of active host mappings:\n");
360 
361 	maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) *
362 					nsp->ns_hostmap_sz);
363 	if (maptable == NULL) {
364 		perror("malloc");
365 		exit(1);
366 	}
367 	if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable,
368 		    sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) {
369 		perror("kmemcpy (maptable)");
370 		return;
371 	}
372 
373 	for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) {
374 		hmp = maptable[hv];
375 
376 		while (hmp) {
377 			if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) {
378 				perror("kmemcpy (hostmap)");
379 				return;
380 			}
381 
382 			printhostmap(&hm, hv);
383 			hmp = hm.hm_next;
384 		}
385 	}
386 	free(maptable);
387 }
388 
389 
390 /*
391  * Issue an ioctl to flush either the NAT rules table or the active mapping
392  * table or both.
393  */
394 void flushtable(fd, opts)
395 int fd, opts;
396 {
397 	int n = 0;
398 
399 	if (opts & OPT_FLUSH) {
400 		n = FLUSH_TABLE_ALL;
401 		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
402 			perror("ioctl(SIOCFLNAT)");
403 		else
404 			printf("%d entries flushed from NAT table\n", n);
405 	}
406 
407 	if (opts & OPT_CLEAR) {
408 		n = FLUSH_LIST;
409 		if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1)
410 			perror("ioctl(SIOCCNATL)");
411 		else
412 			printf("%d entries flushed from NAT list\n", n);
413 	}
414 }
415 
416 /*
417  * Display NAT statistics.
418  */
419 void dostats_live(fd, nsp, opts)
420 natstat_t *nsp;
421 int fd, opts;
422 {
423 	ipfgeniter_t iter;
424 	ipfobj_t obj;
425 	ipnat_t	ipn;
426 	nat_t nat;
427 
428 	bzero((char *)&obj, sizeof(obj));
429 	obj.ipfo_rev = IPFILTER_VERSION;
430 	obj.ipfo_type = IPFOBJ_GENITER;
431 	obj.ipfo_size = sizeof(iter);
432 	obj.ipfo_ptr = &iter;
433 
434 	iter.igi_type = IPFGENITER_IPNAT;
435 	iter.igi_nitems = 1;
436 	iter.igi_data = &ipn;
437 
438 	/*
439 	 * Show list of NAT rules and NAT sessions ?
440 	 */
441 	printf("List of active MAP/Redirect filters:\n");
442 	while (nsp->ns_list) {
443 		if (ioctl(fd, SIOCGENITER, &obj) == -1)
444 			break;
445 		if (opts & OPT_HITS)
446 			printf("%lu ", ipn.in_hits);
447 		printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE));
448 		nsp->ns_list = ipn.in_next;
449 	}
450 
451 	printf("\nList of active sessions:\n");
452 
453 	iter.igi_type = IPFGENITER_NAT;
454 	iter.igi_nitems = 1;
455 	iter.igi_data = &nat;
456 
457 	while (nsp->ns_instances != NULL) {
458 		if (ioctl(fd, SIOCGENITER, &obj) == -1)
459 			break;
460 		printactivenat(&nat, opts, 1);
461 		if (nat.nat_aps)
462 			printaps(nat.nat_aps, opts);
463 		nsp->ns_instances = nat.nat_next;
464 	}
465 
466 	if (opts & OPT_VERBOSE)
467 		showhostmap_live(fd, nsp);
468 }
469 
470 /*
471  * Display the active host mapping table.
472  */
473 void showhostmap_live(fd, nsp)
474 int fd;
475 natstat_t *nsp;
476 {
477 	hostmap_t hm, *hmp;
478 	ipfgeniter_t iter;
479 	ipfobj_t obj;
480 
481 	bzero((char *)&obj, sizeof(obj));
482 	obj.ipfo_rev = IPFILTER_VERSION;
483 	obj.ipfo_type = IPFOBJ_GENITER;
484 	obj.ipfo_size = sizeof(iter);
485 	obj.ipfo_ptr = &iter;
486 
487 	iter.igi_type = IPFGENITER_HOSTMAP;
488 	iter.igi_nitems = 1;
489 	iter.igi_data = &hm;
490 
491 	printf("\nList of active host mappings:\n");
492 
493 	while (nsp->ns_maplist != NULL) {
494 		if (ioctl(fd, SIOCGENITER, &obj) == -1)
495 			break;
496 		printhostmap(&hm, 0);
497 		nsp->ns_maplist = hm.hm_next;
498 	}
499 }
500