1 /* 2 * Copyright (c) 2002-2003 Luigi Rizzo 3 * Copyright (c) 1996 Alex Nash, Paul Traina, Poul-Henning Kamp 4 * Copyright (c) 1994 Ugen J.S.Antsilevich 5 * 6 * Idea and grammar partially left from: 7 * Copyright (c) 1993 Daniel Boulet 8 * 9 * Redistribution and use in source forms, with and without modification, 10 * are permitted provided that this entire comment appears intact. 11 * 12 * Redistribution in binary form may occur without any restrictions. 13 * Obviously, it would be nice if you gave credit where credit is due 14 * but requiring it would be too onerous. 15 * 16 * This software is provided ``AS IS'' without any warranties of any kind. 17 * 18 * NEW command line interface for IP firewall facility 19 * 20 * $FreeBSD$ 21 * 22 * In-kernel nat support 23 */ 24 25 #include <sys/types.h> 26 #include <sys/socket.h> 27 #include <sys/sysctl.h> 28 29 #include "ipfw2.h" 30 31 #include <ctype.h> 32 #include <err.h> 33 #include <netdb.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <sysexits.h> 38 39 #define IPFW_INTERNAL /* Access to protected structures in ip_fw.h. */ 40 41 #include <net/if.h> 42 #include <net/if_dl.h> 43 #include <net/route.h> /* def. of struct route */ 44 #include <netinet/in.h> 45 #include <netinet/ip_fw.h> 46 #include <arpa/inet.h> 47 #include <alias.h> 48 49 static struct _s_x nat_params[] = { 50 { "ip", TOK_IP }, 51 { "if", TOK_IF }, 52 { "log", TOK_ALOG }, 53 { "deny_in", TOK_DENY_INC }, 54 { "same_ports", TOK_SAME_PORTS }, 55 { "unreg_only", TOK_UNREG_ONLY }, 56 { "skip_global", TOK_SKIP_GLOBAL }, 57 { "reset", TOK_RESET_ADDR }, 58 { "reverse", TOK_ALIAS_REV }, 59 { "proxy_only", TOK_PROXY_ONLY }, 60 { "redirect_addr", TOK_REDIR_ADDR }, 61 { "redirect_port", TOK_REDIR_PORT }, 62 { "redirect_proto", TOK_REDIR_PROTO }, 63 { NULL, 0 } /* terminator */ 64 }; 65 66 67 /* 68 * Search for interface with name "ifn", and fill n accordingly: 69 * 70 * n->ip ip address of interface "ifn" 71 * n->if_name copy of interface name "ifn" 72 */ 73 static void 74 set_addr_dynamic(const char *ifn, struct cfg_nat *n) 75 { 76 size_t needed; 77 int mib[6]; 78 char *buf, *lim, *next; 79 struct if_msghdr *ifm; 80 struct ifa_msghdr *ifam; 81 struct sockaddr_dl *sdl; 82 struct sockaddr_in *sin; 83 int ifIndex, ifMTU; 84 85 mib[0] = CTL_NET; 86 mib[1] = PF_ROUTE; 87 mib[2] = 0; 88 mib[3] = AF_INET; 89 mib[4] = NET_RT_IFLIST; 90 mib[5] = 0; 91 /* 92 * Get interface data. 93 */ 94 if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1) 95 err(1, "iflist-sysctl-estimate"); 96 buf = safe_calloc(1, needed); 97 if (sysctl(mib, 6, buf, &needed, NULL, 0) == -1) 98 err(1, "iflist-sysctl-get"); 99 lim = buf + needed; 100 /* 101 * Loop through interfaces until one with 102 * given name is found. This is done to 103 * find correct interface index for routing 104 * message processing. 105 */ 106 ifIndex = 0; 107 next = buf; 108 while (next < lim) { 109 ifm = (struct if_msghdr *)next; 110 next += ifm->ifm_msglen; 111 if (ifm->ifm_version != RTM_VERSION) { 112 if (co.verbose) 113 warnx("routing message version %d " 114 "not understood", ifm->ifm_version); 115 continue; 116 } 117 if (ifm->ifm_type == RTM_IFINFO) { 118 sdl = (struct sockaddr_dl *)(ifm + 1); 119 if (strlen(ifn) == sdl->sdl_nlen && 120 strncmp(ifn, sdl->sdl_data, sdl->sdl_nlen) == 0) { 121 ifIndex = ifm->ifm_index; 122 ifMTU = ifm->ifm_data.ifi_mtu; 123 break; 124 } 125 } 126 } 127 if (!ifIndex) 128 errx(1, "unknown interface name %s", ifn); 129 /* 130 * Get interface address. 131 */ 132 sin = NULL; 133 while (next < lim) { 134 ifam = (struct ifa_msghdr *)next; 135 next += ifam->ifam_msglen; 136 if (ifam->ifam_version != RTM_VERSION) { 137 if (co.verbose) 138 warnx("routing message version %d " 139 "not understood", ifam->ifam_version); 140 continue; 141 } 142 if (ifam->ifam_type != RTM_NEWADDR) 143 break; 144 if (ifam->ifam_addrs & RTA_IFA) { 145 int i; 146 char *cp = (char *)(ifam + 1); 147 148 for (i = 1; i < RTA_IFA; i <<= 1) { 149 if (ifam->ifam_addrs & i) 150 cp += SA_SIZE((struct sockaddr *)cp); 151 } 152 if (((struct sockaddr *)cp)->sa_family == AF_INET) { 153 sin = (struct sockaddr_in *)cp; 154 break; 155 } 156 } 157 } 158 if (sin == NULL) 159 errx(1, "%s: cannot get interface address", ifn); 160 161 n->ip = sin->sin_addr; 162 strncpy(n->if_name, ifn, IF_NAMESIZE); 163 164 free(buf); 165 } 166 167 /* 168 * XXX - The following functions, macros and definitions come from natd.c: 169 * it would be better to move them outside natd.c, in a file 170 * (redirect_support.[ch]?) shared by ipfw and natd, but for now i can live 171 * with it. 172 */ 173 174 /* 175 * Definition of a port range, and macros to deal with values. 176 * FORMAT: HI 16-bits == first port in range, 0 == all ports. 177 * LO 16-bits == number of ports in range 178 * NOTES: - Port values are not stored in network byte order. 179 */ 180 181 #define port_range u_long 182 183 #define GETLOPORT(x) ((x) >> 0x10) 184 #define GETNUMPORTS(x) ((x) & 0x0000ffff) 185 #define GETHIPORT(x) (GETLOPORT((x)) + GETNUMPORTS((x))) 186 187 /* Set y to be the low-port value in port_range variable x. */ 188 #define SETLOPORT(x,y) ((x) = ((x) & 0x0000ffff) | ((y) << 0x10)) 189 190 /* Set y to be the number of ports in port_range variable x. */ 191 #define SETNUMPORTS(x,y) ((x) = ((x) & 0xffff0000) | (y)) 192 193 static void 194 StrToAddr (const char* str, struct in_addr* addr) 195 { 196 struct hostent* hp; 197 198 if (inet_aton (str, addr)) 199 return; 200 201 hp = gethostbyname (str); 202 if (!hp) 203 errx (1, "unknown host %s", str); 204 205 memcpy (addr, hp->h_addr, sizeof (struct in_addr)); 206 } 207 208 static int 209 StrToPortRange (const char* str, const char* proto, port_range *portRange) 210 { 211 char* sep; 212 struct servent* sp; 213 char* end; 214 u_short loPort; 215 u_short hiPort; 216 217 /* First see if this is a service, return corresponding port if so. */ 218 sp = getservbyname (str,proto); 219 if (sp) { 220 SETLOPORT(*portRange, ntohs(sp->s_port)); 221 SETNUMPORTS(*portRange, 1); 222 return 0; 223 } 224 225 /* Not a service, see if it's a single port or port range. */ 226 sep = strchr (str, '-'); 227 if (sep == NULL) { 228 SETLOPORT(*portRange, strtol(str, &end, 10)); 229 if (end != str) { 230 /* Single port. */ 231 SETNUMPORTS(*portRange, 1); 232 return 0; 233 } 234 235 /* Error in port range field. */ 236 errx (EX_DATAERR, "%s/%s: unknown service", str, proto); 237 } 238 239 /* Port range, get the values and sanity check. */ 240 sscanf (str, "%hu-%hu", &loPort, &hiPort); 241 SETLOPORT(*portRange, loPort); 242 SETNUMPORTS(*portRange, 0); /* Error by default */ 243 if (loPort <= hiPort) 244 SETNUMPORTS(*portRange, hiPort - loPort + 1); 245 246 if (GETNUMPORTS(*portRange) == 0) 247 errx (EX_DATAERR, "invalid port range %s", str); 248 249 return 0; 250 } 251 252 static int 253 StrToProto (const char* str) 254 { 255 if (!strcmp (str, "tcp")) 256 return IPPROTO_TCP; 257 258 if (!strcmp (str, "udp")) 259 return IPPROTO_UDP; 260 261 if (!strcmp (str, "sctp")) 262 return IPPROTO_SCTP; 263 errx (EX_DATAERR, "unknown protocol %s. Expected sctp, tcp or udp", str); 264 } 265 266 static int 267 StrToAddrAndPortRange (const char* str, struct in_addr* addr, char* proto, 268 port_range *portRange) 269 { 270 char* ptr; 271 272 ptr = strchr (str, ':'); 273 if (!ptr) 274 errx (EX_DATAERR, "%s is missing port number", str); 275 276 *ptr = '\0'; 277 ++ptr; 278 279 StrToAddr (str, addr); 280 return StrToPortRange (ptr, proto, portRange); 281 } 282 283 /* End of stuff taken from natd.c. */ 284 285 /* 286 * The next 3 functions add support for the addr, port and proto redirect and 287 * their logic is loosely based on SetupAddressRedirect(), SetupPortRedirect() 288 * and SetupProtoRedirect() from natd.c. 289 * 290 * Every setup_* function fills at least one redirect entry 291 * (struct cfg_redir) and zero or more server pool entry (struct cfg_spool) 292 * in buf. 293 * 294 * The format of data in buf is: 295 * 296 * cfg_nat cfg_redir cfg_spool ...... cfg_spool 297 * 298 * ------------------------------------- ------------ 299 * | | .....X ... | | | | ..... 300 * ------------------------------------- ...... ------------ 301 * ^ 302 * spool_cnt n=0 ...... n=(X-1) 303 * 304 * len points to the amount of available space in buf 305 * space counts the memory consumed by every function 306 * 307 * XXX - Every function get all the argv params so it 308 * has to check, in optional parameters, that the next 309 * args is a valid option for the redir entry and not 310 * another token. Only redir_port and redir_proto are 311 * affected by this. 312 */ 313 314 static int 315 estimate_redir_addr(int *ac, char ***av) 316 { 317 size_t space = sizeof(struct cfg_redir); 318 char *sep = **av; 319 u_int c = 0; 320 321 (void)ac; /* UNUSED */ 322 while ((sep = strchr(sep, ',')) != NULL) { 323 c++; 324 sep++; 325 } 326 327 if (c > 0) 328 c++; 329 330 space += c * sizeof(struct cfg_spool); 331 332 return (space); 333 } 334 335 static int 336 setup_redir_addr(char *buf, int *ac, char ***av) 337 { 338 struct cfg_redir *r; 339 char *sep; 340 size_t space; 341 342 r = (struct cfg_redir *)buf; 343 r->mode = REDIR_ADDR; 344 /* Skip cfg_redir at beginning of buf. */ 345 buf = &buf[sizeof(struct cfg_redir)]; 346 space = sizeof(struct cfg_redir); 347 348 /* Extract local address. */ 349 if (strchr(**av, ',') != NULL) { 350 struct cfg_spool *spool; 351 352 /* Setup LSNAT server pool. */ 353 r->laddr.s_addr = INADDR_NONE; 354 sep = strtok(**av, ","); 355 while (sep != NULL) { 356 spool = (struct cfg_spool *)buf; 357 space += sizeof(struct cfg_spool); 358 StrToAddr(sep, &spool->addr); 359 spool->port = ~0; 360 r->spool_cnt++; 361 /* Point to the next possible cfg_spool. */ 362 buf = &buf[sizeof(struct cfg_spool)]; 363 sep = strtok(NULL, ","); 364 } 365 } else 366 StrToAddr(**av, &r->laddr); 367 (*av)++; (*ac)--; 368 369 /* Extract public address. */ 370 StrToAddr(**av, &r->paddr); 371 (*av)++; (*ac)--; 372 373 return (space); 374 } 375 376 static int 377 estimate_redir_port(int *ac, char ***av) 378 { 379 size_t space = sizeof(struct cfg_redir); 380 char *sep = **av; 381 u_int c = 0; 382 383 (void)ac; /* UNUSED */ 384 while ((sep = strchr(sep, ',')) != NULL) { 385 c++; 386 sep++; 387 } 388 389 if (c > 0) 390 c++; 391 392 space += c * sizeof(struct cfg_spool); 393 394 return (space); 395 } 396 397 static int 398 setup_redir_port(char *buf, int *ac, char ***av) 399 { 400 struct cfg_redir *r; 401 char *sep, *protoName, *lsnat = NULL; 402 size_t space; 403 u_short numLocalPorts; 404 port_range portRange; 405 406 numLocalPorts = 0; 407 408 r = (struct cfg_redir *)buf; 409 r->mode = REDIR_PORT; 410 /* Skip cfg_redir at beginning of buf. */ 411 buf = &buf[sizeof(struct cfg_redir)]; 412 space = sizeof(struct cfg_redir); 413 414 /* 415 * Extract protocol. 416 */ 417 r->proto = StrToProto(**av); 418 protoName = **av; 419 (*av)++; (*ac)--; 420 421 /* 422 * Extract local address. 423 */ 424 if (strchr(**av, ',') != NULL) { 425 r->laddr.s_addr = INADDR_NONE; 426 r->lport = ~0; 427 numLocalPorts = 1; 428 lsnat = **av; 429 } else { 430 /* 431 * The sctp nat does not allow the port numbers to be mapped to 432 * new port numbers. Therefore, no ports are to be specified 433 * in the target port field. 434 */ 435 if (r->proto == IPPROTO_SCTP) { 436 if (strchr(**av, ':')) 437 errx(EX_DATAERR, "redirect_port:" 438 "port numbers do not change in sctp, so do " 439 "not specify them as part of the target"); 440 else 441 StrToAddr(**av, &r->laddr); 442 } else { 443 if (StrToAddrAndPortRange(**av, &r->laddr, protoName, 444 &portRange) != 0) 445 errx(EX_DATAERR, "redirect_port: " 446 "invalid local port range"); 447 448 r->lport = GETLOPORT(portRange); 449 numLocalPorts = GETNUMPORTS(portRange); 450 } 451 } 452 (*av)++; (*ac)--; 453 454 /* 455 * Extract public port and optionally address. 456 */ 457 if (strchr(**av, ':') != NULL) { 458 if (StrToAddrAndPortRange(**av, &r->paddr, protoName, 459 &portRange) != 0) 460 errx(EX_DATAERR, "redirect_port: " 461 "invalid public port range"); 462 } else { 463 r->paddr.s_addr = INADDR_ANY; 464 if (StrToPortRange(**av, protoName, &portRange) != 0) 465 errx(EX_DATAERR, "redirect_port: " 466 "invalid public port range"); 467 } 468 469 r->pport = GETLOPORT(portRange); 470 if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */ 471 numLocalPorts = GETNUMPORTS(portRange); 472 r->lport = r->pport; 473 } 474 r->pport_cnt = GETNUMPORTS(portRange); 475 (*av)++; (*ac)--; 476 477 /* 478 * Extract remote address and optionally port. 479 */ 480 /* 481 * NB: isdigit(**av) => we've to check that next parameter is really an 482 * option for this redirect entry, else stop here processing arg[cv]. 483 */ 484 if (*ac != 0 && isdigit(***av)) { 485 if (strchr(**av, ':') != NULL) { 486 if (StrToAddrAndPortRange(**av, &r->raddr, protoName, 487 &portRange) != 0) 488 errx(EX_DATAERR, "redirect_port: " 489 "invalid remote port range"); 490 } else { 491 SETLOPORT(portRange, 0); 492 SETNUMPORTS(portRange, 1); 493 StrToAddr(**av, &r->raddr); 494 } 495 (*av)++; (*ac)--; 496 } else { 497 SETLOPORT(portRange, 0); 498 SETNUMPORTS(portRange, 1); 499 r->raddr.s_addr = INADDR_ANY; 500 } 501 r->rport = GETLOPORT(portRange); 502 r->rport_cnt = GETNUMPORTS(portRange); 503 504 /* 505 * Make sure port ranges match up, then add the redirect ports. 506 */ 507 if (numLocalPorts != r->pport_cnt) 508 errx(EX_DATAERR, "redirect_port: " 509 "port ranges must be equal in size"); 510 511 /* Remote port range is allowed to be '0' which means all ports. */ 512 if (r->rport_cnt != numLocalPorts && 513 (r->rport_cnt != 1 || r->rport != 0)) 514 errx(EX_DATAERR, "redirect_port: remote port must" 515 "be 0 or equal to local port range in size"); 516 517 /* Setup LSNAT server pool. */ 518 if (lsnat != NULL) { 519 struct cfg_spool *spool; 520 521 sep = strtok(lsnat, ","); 522 while (sep != NULL) { 523 spool = (struct cfg_spool *)buf; 524 space += sizeof(struct cfg_spool); 525 /* 526 * The sctp nat does not allow the port numbers to 527 * be mapped to new port numbers. Therefore, no ports 528 * are to be specified in the target port field. 529 */ 530 if (r->proto == IPPROTO_SCTP) { 531 if (strchr (sep, ':')) { 532 errx(EX_DATAERR, "redirect_port:" 533 "port numbers do not change in " 534 "sctp, so do not specify them as " 535 "part of the target"); 536 } else { 537 StrToAddr(sep, &spool->addr); 538 spool->port = r->pport; 539 } 540 } else { 541 if (StrToAddrAndPortRange(sep, &spool->addr, 542 protoName, &portRange) != 0) 543 errx(EX_DATAERR, "redirect_port:" 544 "invalid local port range"); 545 if (GETNUMPORTS(portRange) != 1) 546 errx(EX_DATAERR, "redirect_port: " 547 "local port must be single in " 548 "this context"); 549 spool->port = GETLOPORT(portRange); 550 } 551 r->spool_cnt++; 552 /* Point to the next possible cfg_spool. */ 553 buf = &buf[sizeof(struct cfg_spool)]; 554 sep = strtok(NULL, ","); 555 } 556 } 557 558 return (space); 559 } 560 561 static int 562 setup_redir_proto(char *buf, int *ac, char ***av) 563 { 564 struct cfg_redir *r; 565 struct protoent *protoent; 566 size_t space; 567 568 r = (struct cfg_redir *)buf; 569 r->mode = REDIR_PROTO; 570 /* Skip cfg_redir at beginning of buf. */ 571 buf = &buf[sizeof(struct cfg_redir)]; 572 space = sizeof(struct cfg_redir); 573 574 /* 575 * Extract protocol. 576 */ 577 protoent = getprotobyname(**av); 578 if (protoent == NULL) 579 errx(EX_DATAERR, "redirect_proto: unknown protocol %s", **av); 580 else 581 r->proto = protoent->p_proto; 582 583 (*av)++; (*ac)--; 584 585 /* 586 * Extract local address. 587 */ 588 StrToAddr(**av, &r->laddr); 589 590 (*av)++; (*ac)--; 591 592 /* 593 * Extract optional public address. 594 */ 595 if (*ac == 0) { 596 r->paddr.s_addr = INADDR_ANY; 597 r->raddr.s_addr = INADDR_ANY; 598 } else { 599 /* see above in setup_redir_port() */ 600 if (isdigit(***av)) { 601 StrToAddr(**av, &r->paddr); 602 (*av)++; (*ac)--; 603 604 /* 605 * Extract optional remote address. 606 */ 607 /* see above in setup_redir_port() */ 608 if (*ac != 0 && isdigit(***av)) { 609 StrToAddr(**av, &r->raddr); 610 (*av)++; (*ac)--; 611 } 612 } 613 } 614 615 return (space); 616 } 617 618 static void 619 print_nat_config(unsigned char *buf) 620 { 621 struct cfg_nat *n; 622 int i, cnt, flag, off; 623 struct cfg_redir *t; 624 struct cfg_spool *s; 625 struct protoent *p; 626 627 n = (struct cfg_nat *)buf; 628 flag = 1; 629 off = sizeof(*n); 630 printf("ipfw nat %u config", n->id); 631 if (strlen(n->if_name) != 0) 632 printf(" if %s", n->if_name); 633 else if (n->ip.s_addr != 0) 634 printf(" ip %s", inet_ntoa(n->ip)); 635 while (n->mode != 0) { 636 if (n->mode & PKT_ALIAS_LOG) { 637 printf(" log"); 638 n->mode &= ~PKT_ALIAS_LOG; 639 } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { 640 printf(" deny_in"); 641 n->mode &= ~PKT_ALIAS_DENY_INCOMING; 642 } else if (n->mode & PKT_ALIAS_SAME_PORTS) { 643 printf(" same_ports"); 644 n->mode &= ~PKT_ALIAS_SAME_PORTS; 645 } else if (n->mode & PKT_ALIAS_SKIP_GLOBAL) { 646 printf(" skip_global"); 647 n->mode &= ~PKT_ALIAS_SKIP_GLOBAL; 648 } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { 649 printf(" unreg_only"); 650 n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; 651 } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { 652 printf(" reset"); 653 n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; 654 } else if (n->mode & PKT_ALIAS_REVERSE) { 655 printf(" reverse"); 656 n->mode &= ~PKT_ALIAS_REVERSE; 657 } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { 658 printf(" proxy_only"); 659 n->mode &= ~PKT_ALIAS_PROXY_ONLY; 660 } 661 } 662 /* Print all the redirect's data configuration. */ 663 for (cnt = 0; cnt < n->redir_cnt; cnt++) { 664 t = (struct cfg_redir *)&buf[off]; 665 off += SOF_REDIR; 666 switch (t->mode) { 667 case REDIR_ADDR: 668 printf(" redirect_addr"); 669 if (t->spool_cnt == 0) 670 printf(" %s", inet_ntoa(t->laddr)); 671 else 672 for (i = 0; i < t->spool_cnt; i++) { 673 s = (struct cfg_spool *)&buf[off]; 674 if (i) 675 printf(","); 676 else 677 printf(" "); 678 printf("%s", inet_ntoa(s->addr)); 679 off += SOF_SPOOL; 680 } 681 printf(" %s", inet_ntoa(t->paddr)); 682 break; 683 case REDIR_PORT: 684 p = getprotobynumber(t->proto); 685 printf(" redirect_port %s ", p->p_name); 686 if (!t->spool_cnt) { 687 printf("%s:%u", inet_ntoa(t->laddr), t->lport); 688 if (t->pport_cnt > 1) 689 printf("-%u", t->lport + 690 t->pport_cnt - 1); 691 } else 692 for (i=0; i < t->spool_cnt; i++) { 693 s = (struct cfg_spool *)&buf[off]; 694 if (i) 695 printf(","); 696 printf("%s:%u", inet_ntoa(s->addr), 697 s->port); 698 off += SOF_SPOOL; 699 } 700 701 printf(" "); 702 if (t->paddr.s_addr) 703 printf("%s:", inet_ntoa(t->paddr)); 704 printf("%u", t->pport); 705 if (!t->spool_cnt && t->pport_cnt > 1) 706 printf("-%u", t->pport + t->pport_cnt - 1); 707 708 if (t->raddr.s_addr) { 709 printf(" %s", inet_ntoa(t->raddr)); 710 if (t->rport) { 711 printf(":%u", t->rport); 712 if (!t->spool_cnt && t->rport_cnt > 1) 713 printf("-%u", t->rport + 714 t->rport_cnt - 1); 715 } 716 } 717 break; 718 case REDIR_PROTO: 719 p = getprotobynumber(t->proto); 720 printf(" redirect_proto %s %s", p->p_name, 721 inet_ntoa(t->laddr)); 722 if (t->paddr.s_addr != 0) { 723 printf(" %s", inet_ntoa(t->paddr)); 724 if (t->raddr.s_addr) 725 printf(" %s", inet_ntoa(t->raddr)); 726 } 727 break; 728 default: 729 errx(EX_DATAERR, "unknown redir mode"); 730 break; 731 } 732 } 733 printf("\n"); 734 } 735 736 void 737 ipfw_config_nat(int ac, char **av) 738 { 739 struct cfg_nat *n; /* Nat instance configuration. */ 740 int i, off, tok, ac1; 741 char *id, *buf, **av1, *end; 742 size_t len; 743 744 av++; 745 ac--; 746 /* Nat id. */ 747 if (ac == 0) 748 errx(EX_DATAERR, "missing nat id"); 749 id = *av; 750 i = (int)strtol(id, &end, 0); 751 if (i <= 0 || *end != '\0') 752 errx(EX_DATAERR, "illegal nat id: %s", id); 753 av++; 754 ac--; 755 if (ac == 0) 756 errx(EX_DATAERR, "missing option"); 757 758 len = sizeof(struct cfg_nat); 759 ac1 = ac; 760 av1 = av; 761 while (ac1 > 0) { 762 tok = match_token(nat_params, *av1); 763 ac1--; 764 av1++; 765 switch (tok) { 766 case TOK_IP: 767 case TOK_IF: 768 ac1--; 769 av1++; 770 break; 771 case TOK_ALOG: 772 case TOK_DENY_INC: 773 case TOK_SAME_PORTS: 774 case TOK_SKIP_GLOBAL: 775 case TOK_UNREG_ONLY: 776 case TOK_RESET_ADDR: 777 case TOK_ALIAS_REV: 778 case TOK_PROXY_ONLY: 779 break; 780 case TOK_REDIR_ADDR: 781 if (ac1 < 2) 782 errx(EX_DATAERR, "redirect_addr: " 783 "not enough arguments"); 784 len += estimate_redir_addr(&ac1, &av1); 785 av1 += 2; 786 ac1 -= 2; 787 break; 788 case TOK_REDIR_PORT: 789 if (ac1 < 3) 790 errx(EX_DATAERR, "redirect_port: " 791 "not enough arguments"); 792 av1++; 793 ac1--; 794 len += estimate_redir_port(&ac1, &av1); 795 av1 += 2; 796 ac1 -= 2; 797 /* Skip optional remoteIP/port */ 798 if (ac1 != 0 && isdigit(**av1)) { 799 av1++; 800 ac1--; 801 } 802 break; 803 case TOK_REDIR_PROTO: 804 if (ac1 < 2) 805 errx(EX_DATAERR, "redirect_proto: " 806 "not enough arguments"); 807 len += sizeof(struct cfg_redir); 808 av1 += 2; 809 ac1 -= 2; 810 /* Skip optional remoteIP/port */ 811 if (ac1 != 0 && isdigit(**av1)) { 812 av1++; 813 ac1--; 814 } 815 if (ac1 != 0 && isdigit(**av1)) { 816 av1++; 817 ac1--; 818 } 819 break; 820 default: 821 errx(EX_DATAERR, "unrecognised option ``%s''", av1[-1]); 822 } 823 } 824 825 if ((buf = malloc(len)) == NULL) 826 errx(EX_OSERR, "malloc failed"); 827 828 /* Offset in buf: save space for n at the beginning. */ 829 off = sizeof(*n); 830 memset(buf, 0, len); 831 n = (struct cfg_nat *)buf; 832 n->id = i; 833 834 while (ac > 0) { 835 tok = match_token(nat_params, *av); 836 ac--; 837 av++; 838 switch (tok) { 839 case TOK_IP: 840 if (ac == 0) 841 errx(EX_DATAERR, "missing option"); 842 if (!inet_aton(av[0], &(n->ip))) 843 errx(EX_DATAERR, "bad ip address ``%s''", 844 av[0]); 845 ac--; 846 av++; 847 break; 848 case TOK_IF: 849 if (ac == 0) 850 errx(EX_DATAERR, "missing option"); 851 set_addr_dynamic(av[0], n); 852 ac--; 853 av++; 854 break; 855 case TOK_ALOG: 856 n->mode |= PKT_ALIAS_LOG; 857 break; 858 case TOK_DENY_INC: 859 n->mode |= PKT_ALIAS_DENY_INCOMING; 860 break; 861 case TOK_SAME_PORTS: 862 n->mode |= PKT_ALIAS_SAME_PORTS; 863 break; 864 case TOK_UNREG_ONLY: 865 n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; 866 break; 867 case TOK_SKIP_GLOBAL: 868 n->mode |= PKT_ALIAS_SKIP_GLOBAL; 869 break; 870 case TOK_RESET_ADDR: 871 n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; 872 break; 873 case TOK_ALIAS_REV: 874 n->mode |= PKT_ALIAS_REVERSE; 875 break; 876 case TOK_PROXY_ONLY: 877 n->mode |= PKT_ALIAS_PROXY_ONLY; 878 break; 879 /* 880 * All the setup_redir_* functions work directly in 881 * the final buffer, see above for details. 882 */ 883 case TOK_REDIR_ADDR: 884 case TOK_REDIR_PORT: 885 case TOK_REDIR_PROTO: 886 switch (tok) { 887 case TOK_REDIR_ADDR: 888 i = setup_redir_addr(&buf[off], &ac, &av); 889 break; 890 case TOK_REDIR_PORT: 891 i = setup_redir_port(&buf[off], &ac, &av); 892 break; 893 case TOK_REDIR_PROTO: 894 i = setup_redir_proto(&buf[off], &ac, &av); 895 break; 896 } 897 n->redir_cnt++; 898 off += i; 899 break; 900 } 901 } 902 903 i = do_cmd(IP_FW_NAT_CFG, buf, off); 904 if (i) 905 err(1, "setsockopt(%s)", "IP_FW_NAT_CFG"); 906 907 if (!co.do_quiet) { 908 /* After every modification, we show the resultant rule. */ 909 int _ac = 3; 910 const char *_av[] = {"show", "config", id}; 911 ipfw_show_nat(_ac, (char **)(void *)_av); 912 } 913 } 914 915 916 void 917 ipfw_show_nat(int ac, char **av) 918 { 919 struct cfg_nat *n; 920 struct cfg_redir *e; 921 int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size; 922 int nat_cnt, redir_cnt, r; 923 uint8_t *data, *p; 924 char *endptr; 925 926 do_rule = 0; 927 nalloc = 1024; 928 size = 0; 929 data = NULL; 930 frule = 0; 931 lrule = IPFW_DEFAULT_RULE; /* max ipfw rule number */ 932 ac--; 933 av++; 934 935 if (co.test_only) 936 return; 937 938 /* Parse parameters. */ 939 for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) { 940 if (!strncmp(av[0], "config", strlen(av[0]))) { 941 cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1; 942 continue; 943 } 944 /* Convert command line rule #. */ 945 frule = lrule = strtoul(av[0], &endptr, 10); 946 if (*endptr == '-') 947 lrule = strtoul(endptr+1, &endptr, 10); 948 if (lrule == 0) 949 err(EX_USAGE, "invalid rule number: %s", av[0]); 950 do_rule = 1; 951 } 952 953 nbytes = nalloc; 954 while (nbytes >= nalloc) { 955 nalloc = nalloc * 2; 956 nbytes = nalloc; 957 data = safe_realloc(data, nbytes); 958 if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0) 959 err(EX_OSERR, "getsockopt(IP_FW_GET_%s)", 960 (cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG"); 961 } 962 if (nbytes == 0) 963 exit(0); 964 if (do_cfg) { 965 nat_cnt = *((int *)data); 966 for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) { 967 n = (struct cfg_nat *)&data[i]; 968 if (frule <= n->id && lrule >= n->id) 969 print_nat_config(&data[i]); 970 i += sizeof(struct cfg_nat); 971 for (redir_cnt = 0; redir_cnt < n->redir_cnt; redir_cnt++) { 972 e = (struct cfg_redir *)&data[i]; 973 i += sizeof(struct cfg_redir) + e->spool_cnt * 974 sizeof(struct cfg_spool); 975 } 976 } 977 } else { 978 for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) { 979 p = &data[i]; 980 if (p == data + nbytes) 981 break; 982 bcopy(p, &r, sizeof(int)); 983 if (do_rule) { 984 if (!(frule <= r && lrule >= r)) 985 continue; 986 } 987 printf("nat %u: %s\n", r, p+sizeof(int)); 988 } 989 } 990 } 991