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
usage(name)95 void usage(name)
96 char *name;
97 {
98 fprintf(stderr, "Usage: %s [-CdFhlnrRsv] [-f filename]\n", name);
99 exit(1);
100 }
101
102
main(argc,argv)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 */
natstat_dead(nsp,kernel)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 */
dostats(fd,nsp,opts,alive)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 */
showhostmap(nsp)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 */
flushtable(fd,opts)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 */
dostats_live(fd,nsp,opts)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 */
showhostmap_live(fd,nsp)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