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 2007 Sun Microsystems, Inc. All rights reserved. 9 * Use is subject to license terms. 10 */ 11 12 #pragma ident "%Z%%M% %I% %E% SMI" 13 14 #include <stdio.h> 15 #include <string.h> 16 #include <fcntl.h> 17 #include <errno.h> 18 #include <sys/types.h> 19 #if !defined(__SVR4) && !defined(__svr4__) 20 #include <strings.h> 21 #else 22 #include <sys/byteorder.h> 23 #endif 24 #include <sys/time.h> 25 #include <sys/param.h> 26 #include <stdlib.h> 27 #include <unistd.h> 28 #include <stddef.h> 29 #include <sys/file.h> 30 #define _KERNEL 31 #include <sys/uio.h> 32 #undef _KERNEL 33 #include <sys/socket.h> 34 #include <sys/ioctl.h> 35 #if defined(sun) && (defined(__svr4__) || defined(__SVR4)) 36 # include <sys/ioccom.h> 37 # include <sys/sysmacros.h> 38 #endif 39 #include <netinet/in.h> 40 #include <netinet/in_systm.h> 41 #include <netinet/ip.h> 42 #include <netinet/tcp.h> 43 #include <net/if.h> 44 #if __FreeBSD_version >= 300000 45 # include <net/if_var.h> 46 #endif 47 #include <netdb.h> 48 #include <arpa/nameser.h> 49 #include <arpa/inet.h> 50 #include <resolv.h> 51 #include <ctype.h> 52 #if defined(linux) 53 # include <linux/a.out.h> 54 #else 55 # include <nlist.h> 56 #endif 57 #include "ipf.h" 58 #include "netinet/ipl.h" 59 #include "kmem.h" 60 61 #ifdef __hpux 62 # define nlist nlist64 63 #endif 64 65 #if defined(sun) && !SOLARIS2 66 # define STRERROR(x) sys_errlist[x] 67 extern char *sys_errlist[]; 68 #else 69 # define STRERROR(x) strerror(x) 70 #endif 71 72 #if !defined(lint) 73 static const char sccsid[] ="@(#)ipnat.c 1.9 6/5/96 (C) 1993 Darren Reed"; 74 static const char rcsid[] = "@(#)$Id: ipnat.c,v 1.24.2.2 2005/05/10 21:19:30 darrenr Exp $"; 75 #endif 76 77 78 #if SOLARIS 79 #define bzero(a,b) memset(a,0,b) 80 #endif 81 int use_inet6 = 0; 82 char thishost[MAXHOSTNAMELEN]; 83 84 extern char *optarg; 85 86 void dostats __P((int, natstat_t *, int, int)); 87 void flushtable __P((int, int)); 88 void usage __P((char *)); 89 int main __P((int, char*[])); 90 void showhostmap __P((natstat_t *nsp)); 91 void natstat_dead __P((natstat_t *, char *)); 92 void dostats_live __P((int, natstat_t *, int)); 93 void showhostmap_live __P((int, natstat_t *)); 94 95 int opts; 96 97 void usage(name) 98 char *name; 99 { 100 fprintf(stderr, "Usage: %s [-CdFhlnrRsv] [-f filename]\n", name); 101 exit(1); 102 } 103 104 105 int main(argc, argv) 106 int argc; 107 char *argv[]; 108 { 109 char *file, *core, *kernel; 110 natstat_t ns, *nsp; 111 int fd, c, mode; 112 ipfobj_t obj; 113 114 fd = -1; 115 opts = 0; 116 nsp = &ns; 117 file = NULL; 118 core = NULL; 119 kernel = NULL; 120 mode = O_RDWR; 121 122 while ((c = getopt(argc, argv, "CdFf:hlM:N:nrRsv")) != -1) 123 switch (c) 124 { 125 case 'C' : 126 opts |= OPT_CLEAR; 127 break; 128 case 'd' : 129 opts |= OPT_DEBUG; 130 break; 131 case 'f' : 132 file = optarg; 133 break; 134 case 'F' : 135 opts |= OPT_FLUSH; 136 break; 137 case 'h' : 138 opts |=OPT_HITS; 139 break; 140 case 'l' : 141 opts |= OPT_LIST; 142 mode = O_RDONLY; 143 break; 144 case 'M' : 145 core = optarg; 146 break; 147 case 'N' : 148 kernel = optarg; 149 break; 150 case 'n' : 151 opts |= OPT_DONOTHING; 152 mode = O_RDONLY; 153 break; 154 case 'R' : 155 opts |= OPT_NORESOLVE; 156 break; 157 case 'r' : 158 opts |= OPT_REMOVE; 159 break; 160 case 's' : 161 opts |= OPT_STAT; 162 mode = O_RDONLY; 163 break; 164 case 'v' : 165 opts |= OPT_VERBOSE; 166 break; 167 default : 168 usage(argv[0]); 169 } 170 171 initparse(); 172 173 if ((kernel != NULL) || (core != NULL)) { 174 (void) setgid(getgid()); 175 (void) setreuid(getuid(), getuid()); 176 } 177 178 bzero((char *)&ns, sizeof(ns)); 179 180 if ((opts & OPT_DONOTHING) == 0) { 181 if (checkrev(IPL_NAME) == -1) { 182 fprintf(stderr, "User/kernel version check failed\n"); 183 exit(1); 184 } 185 } 186 187 188 if (!(opts & OPT_DONOTHING) && (kernel == NULL) && (core == NULL)) { 189 #ifdef notdef 190 if (openkmem(kernel, core) == -1) 191 exit(1); 192 #endif 193 if (((fd = open(IPNAT_NAME, mode)) == -1) && 194 ((fd = open(IPNAT_NAME, O_RDONLY)) == -1)) { 195 (void) fprintf(stderr, "%s: open: %s\n", IPNAT_NAME, 196 STRERROR(errno)); 197 exit(1); 198 } 199 200 bzero((char *)&obj, sizeof(obj)); 201 obj.ipfo_rev = IPFILTER_VERSION; 202 obj.ipfo_size = sizeof(*nsp); 203 obj.ipfo_type = IPFOBJ_NATSTAT; 204 obj.ipfo_ptr = (void *)nsp; 205 if (ioctl(fd, SIOCGNATS, &obj) == -1) { 206 perror("ioctl(SIOCGNATS)"); 207 exit(1); 208 } 209 (void) setgid(getgid()); 210 (void) setreuid(getuid(), getuid()); 211 } else if ((kernel != NULL) || (core != NULL)) { 212 if (openkmem(kernel, core) == -1) 213 exit(1); 214 215 natstat_dead(nsp, kernel); 216 if (opts & (OPT_LIST|OPT_STAT)) 217 dostats(fd, nsp, opts, 0); 218 exit(0); 219 } 220 221 if (opts & (OPT_FLUSH|OPT_CLEAR)) 222 flushtable(fd, opts); 223 if (file) { 224 ipnat_parsefile(fd, ipnat_addrule, ioctl, file); 225 } 226 if (opts & (OPT_LIST|OPT_STAT)) 227 dostats(fd, nsp, opts, 1); 228 return 0; 229 } 230 231 232 /* 233 * Read NAT statistic information in using a symbol table and memory file 234 * rather than doing ioctl's. 235 */ 236 void natstat_dead(nsp, kernel) 237 natstat_t *nsp; 238 char *kernel; 239 { 240 struct nlist nat_nlist[10] = { 241 { "nat_table" }, /* 0 */ 242 { "nat_list" }, 243 { "maptable" }, 244 { "ipf_nattable_sz" }, 245 { "ipf_natrules_sz" }, 246 { "ipf_rdrrules_sz" }, /* 5 */ 247 { "ipf_hostmap_sz" }, 248 { "nat_instances" }, 249 { "ap_sess_list" }, 250 { NULL } 251 }; 252 void *tables[2]; 253 254 if (nlist(kernel, nat_nlist) == -1) { 255 fprintf(stderr, "nlist error\n"); 256 return; 257 } 258 259 /* 260 * Normally the ioctl copies all of these values into the structure 261 * for us, before returning it to userland, so here we must copy each 262 * one in individually. 263 */ 264 kmemcpy((char *)&tables, nat_nlist[0].n_value, sizeof(tables)); 265 nsp->ns_table[0] = tables[0]; 266 nsp->ns_table[1] = tables[1]; 267 268 kmemcpy((char *)&nsp->ns_list, nat_nlist[1].n_value, 269 sizeof(nsp->ns_list)); 270 kmemcpy((char *)&nsp->ns_maptable, nat_nlist[2].n_value, 271 sizeof(nsp->ns_maptable)); 272 kmemcpy((char *)&nsp->ns_nattab_sz, nat_nlist[3].n_value, 273 sizeof(nsp->ns_nattab_sz)); 274 kmemcpy((char *)&nsp->ns_rultab_sz, nat_nlist[4].n_value, 275 sizeof(nsp->ns_rultab_sz)); 276 kmemcpy((char *)&nsp->ns_rdrtab_sz, nat_nlist[5].n_value, 277 sizeof(nsp->ns_rdrtab_sz)); 278 kmemcpy((char *)&nsp->ns_hostmap_sz, nat_nlist[6].n_value, 279 sizeof(nsp->ns_hostmap_sz)); 280 kmemcpy((char *)&nsp->ns_instances, nat_nlist[7].n_value, 281 sizeof(nsp->ns_instances)); 282 kmemcpy((char *)&nsp->ns_apslist, nat_nlist[8].n_value, 283 sizeof(nsp->ns_apslist)); 284 } 285 286 287 /* 288 * Display NAT statistics. 289 */ 290 void dostats(fd, nsp, opts, alive) 291 natstat_t *nsp; 292 int fd, opts, alive; 293 { 294 nat_t *np, nat; 295 ipnat_t ipn; 296 297 /* 298 * Show statistics ? 299 */ 300 if (opts & OPT_STAT) { 301 printf("mapped\tin\t%lu\tout\t%lu\n", 302 nsp->ns_mapped[0], nsp->ns_mapped[1]); 303 printf("added\t%lu\texpired\t%lu\n", 304 nsp->ns_added, nsp->ns_expire); 305 printf("no memory\t%lu\tbad nat\t%lu\n", 306 nsp->ns_memfail, nsp->ns_badnat); 307 printf("inuse\t%lu\nrules\t%lu\n", 308 nsp->ns_inuse, nsp->ns_rules); 309 printf("wilds\t%u\n", nsp->ns_wilds); 310 if (opts & OPT_VERBOSE) 311 printf("table %p list %p\n", 312 nsp->ns_table, nsp->ns_list); 313 } 314 315 /* 316 * Show list of NAT rules and NAT sessions ? 317 */ 318 if (opts & OPT_LIST) { 319 if (alive) { 320 dostats_live(fd, nsp, opts); 321 return; 322 } 323 printf("List of active MAP/Redirect filters:\n"); 324 while (nsp->ns_list) { 325 if (kmemcpy((char *)&ipn, (long)nsp->ns_list, 326 sizeof(ipn))) { 327 perror("kmemcpy"); 328 break; 329 } 330 if (opts & OPT_HITS) 331 printf("%lu ", ipn.in_hits); 332 printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE)); 333 nsp->ns_list = ipn.in_next; 334 } 335 336 printf("\nList of active sessions:\n"); 337 338 for (np = nsp->ns_instances; np; np = nat.nat_next) { 339 if (kmemcpy((char *)&nat, (long)np, sizeof(nat))) 340 break; 341 printactivenat(&nat, opts, 0); 342 if (nat.nat_aps) 343 printaps(nat.nat_aps, opts); 344 } 345 346 if (opts & OPT_VERBOSE) 347 showhostmap(nsp); 348 } 349 } 350 351 352 /* 353 * Display the active host mapping table. 354 */ 355 void showhostmap(nsp) 356 natstat_t *nsp; 357 { 358 hostmap_t hm, *hmp, **maptable; 359 u_int hv; 360 361 printf("\nList of active host mappings:\n"); 362 363 maptable = (hostmap_t **)malloc(sizeof(hostmap_t *) * 364 nsp->ns_hostmap_sz); 365 if (maptable == NULL) { 366 perror("malloc"); 367 exit(1); 368 } 369 if (kmemcpy((char *)maptable, (u_long)nsp->ns_maptable, 370 sizeof(hostmap_t *) * nsp->ns_hostmap_sz)) { 371 perror("kmemcpy (maptable)"); 372 return; 373 } 374 375 for (hv = 0; hv < nsp->ns_hostmap_sz; hv++) { 376 hmp = maptable[hv]; 377 378 while (hmp) { 379 if (kmemcpy((char *)&hm, (u_long)hmp, sizeof(hm))) { 380 perror("kmemcpy (hostmap)"); 381 return; 382 } 383 384 printhostmap(&hm, hv); 385 hmp = hm.hm_next; 386 } 387 } 388 free(maptable); 389 } 390 391 392 /* 393 * Issue an ioctl to flush either the NAT rules table or the active mapping 394 * table or both. 395 */ 396 void flushtable(fd, opts) 397 int fd, opts; 398 { 399 int n = 0; 400 401 if (opts & OPT_FLUSH) { 402 n = 0; 403 if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1) 404 perror("ioctl(SIOCFLNAT)"); 405 else 406 printf("%d entries flushed from NAT table\n", n); 407 } 408 409 if (opts & OPT_CLEAR) { 410 n = 1; 411 if (!(opts & OPT_DONOTHING) && ioctl(fd, SIOCIPFFL, &n) == -1) 412 perror("ioctl(SIOCCNATL)"); 413 else 414 printf("%d entries flushed from NAT list\n", n); 415 } 416 } 417 418 /* 419 * Display NAT statistics. 420 */ 421 void dostats_live(fd, nsp, opts) 422 natstat_t *nsp; 423 int fd, opts; 424 { 425 ipfgeniter_t iter; 426 ipfobj_t obj; 427 ipnat_t ipn; 428 nat_t nat; 429 430 bzero((char *)&obj, sizeof(obj)); 431 obj.ipfo_rev = IPFILTER_VERSION; 432 obj.ipfo_type = IPFOBJ_GENITER; 433 obj.ipfo_size = sizeof(iter); 434 obj.ipfo_ptr = &iter; 435 436 iter.igi_type = IPFGENITER_IPNAT; 437 iter.igi_nitems = 1; 438 iter.igi_data = &ipn; 439 440 /* 441 * Show list of NAT rules and NAT sessions ? 442 */ 443 printf("List of active MAP/Redirect filters:\n"); 444 while (nsp->ns_list) { 445 if (ioctl(fd, SIOCGENITER, &obj) == -1) 446 break; 447 if (opts & OPT_HITS) 448 printf("%lu ", ipn.in_hits); 449 printnat(&ipn, opts & (OPT_DEBUG|OPT_VERBOSE)); 450 nsp->ns_list = ipn.in_next; 451 } 452 453 (void) ioctl(fd, SIOCIPFDELTOK, &iter.igi_type); 454 455 printf("\nList of active sessions:\n"); 456 457 iter.igi_type = IPFGENITER_NAT; 458 iter.igi_nitems = 1; 459 iter.igi_data = &nat; 460 461 while (nsp->ns_instances != NULL) { 462 if (ioctl(fd, SIOCGENITER, &obj) == -1) 463 break; 464 printactivenat(&nat, opts, 1); 465 if (nat.nat_aps) 466 printaps(nat.nat_aps, opts); 467 nsp->ns_instances = nat.nat_next; 468 } 469 470 (void) ioctl(fd, SIOCIPFDELTOK, &iter.igi_type); 471 472 if (opts & OPT_VERBOSE) 473 showhostmap_live(fd, nsp); 474 } 475 476 /* 477 * Display the active host mapping table. 478 */ 479 void showhostmap_live(fd, nsp) 480 int fd; 481 natstat_t *nsp; 482 { 483 hostmap_t hm, *hmp; 484 ipfgeniter_t iter; 485 ipfobj_t obj; 486 487 bzero((char *)&obj, sizeof(obj)); 488 obj.ipfo_rev = IPFILTER_VERSION; 489 obj.ipfo_type = IPFOBJ_GENITER; 490 obj.ipfo_size = sizeof(iter); 491 obj.ipfo_ptr = &iter; 492 493 iter.igi_type = IPFGENITER_HOSTMAP; 494 iter.igi_nitems = 1; 495 iter.igi_data = &hm; 496 497 printf("\nList of active host mappings:\n"); 498 499 while (nsp->ns_maplist != NULL) { 500 if (ioctl(fd, SIOCGENITER, &obj) == -1) 501 break; 502 printhostmap(&hm, 0); 503 nsp->ns_maplist = hm.hm_next; 504 } 505 506 (void) ioctl(fd, SIOCIPFDELTOK, &iter.igi_type); 507 } 508