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 while ((sep = strchr(sep, ',')) != NULL) { 322 c++; 323 sep++; 324 } 325 326 if (c > 0) 327 c++; 328 329 space += c * sizeof(struct cfg_spool); 330 331 return (space); 332 } 333 334 static int 335 setup_redir_addr(char *buf, int *ac, char ***av) 336 { 337 struct cfg_redir *r; 338 char *sep; 339 size_t space; 340 341 r = (struct cfg_redir *)buf; 342 r->mode = REDIR_ADDR; 343 /* Skip cfg_redir at beginning of buf. */ 344 buf = &buf[sizeof(struct cfg_redir)]; 345 space = sizeof(struct cfg_redir); 346 347 /* Extract local address. */ 348 if (strchr(**av, ',') != NULL) { 349 struct cfg_spool *spool; 350 351 /* Setup LSNAT server pool. */ 352 r->laddr.s_addr = INADDR_NONE; 353 sep = strtok(**av, ","); 354 while (sep != NULL) { 355 spool = (struct cfg_spool *)buf; 356 space += sizeof(struct cfg_spool); 357 StrToAddr(sep, &spool->addr); 358 spool->port = ~0; 359 r->spool_cnt++; 360 /* Point to the next possible cfg_spool. */ 361 buf = &buf[sizeof(struct cfg_spool)]; 362 sep = strtok(NULL, ","); 363 } 364 } else 365 StrToAddr(**av, &r->laddr); 366 (*av)++; (*ac)--; 367 368 /* Extract public address. */ 369 StrToAddr(**av, &r->paddr); 370 (*av)++; (*ac)--; 371 372 return (space); 373 } 374 375 static int 376 estimate_redir_port(int *ac, char ***av) 377 { 378 size_t space = sizeof(struct cfg_redir); 379 char *sep = **av; 380 u_int c = 0; 381 382 while ((sep = strchr(sep, ',')) != NULL) { 383 c++; 384 sep++; 385 } 386 387 if (c > 0) 388 c++; 389 390 space += c * sizeof(struct cfg_spool); 391 392 return (space); 393 } 394 395 static int 396 setup_redir_port(char *buf, int *ac, char ***av) 397 { 398 struct cfg_redir *r; 399 char *sep, *protoName, *lsnat = NULL; 400 size_t space; 401 u_short numLocalPorts; 402 port_range portRange; 403 404 numLocalPorts = 0; 405 406 r = (struct cfg_redir *)buf; 407 r->mode = REDIR_PORT; 408 /* Skip cfg_redir at beginning of buf. */ 409 buf = &buf[sizeof(struct cfg_redir)]; 410 space = sizeof(struct cfg_redir); 411 412 /* 413 * Extract protocol. 414 */ 415 r->proto = StrToProto(**av); 416 protoName = **av; 417 (*av)++; (*ac)--; 418 419 /* 420 * Extract local address. 421 */ 422 if ((sep = strchr(**av, ',')) != NULL) { 423 r->laddr.s_addr = INADDR_NONE; 424 r->lport = ~0; 425 numLocalPorts = 1; 426 lsnat = **av; 427 } else { 428 /* 429 * The sctp nat does not allow the port numbers to be mapped to 430 * new port numbers. Therefore, no ports are to be specified 431 * in the target port field. 432 */ 433 if (r->proto == IPPROTO_SCTP) { 434 if (strchr(**av, ':')) 435 errx(EX_DATAERR, "redirect_port:" 436 "port numbers do not change in sctp, so do " 437 "not specify them as part of the target"); 438 else 439 StrToAddr(**av, &r->laddr); 440 } else { 441 if (StrToAddrAndPortRange(**av, &r->laddr, protoName, 442 &portRange) != 0) 443 errx(EX_DATAERR, "redirect_port: " 444 "invalid local port range"); 445 446 r->lport = GETLOPORT(portRange); 447 numLocalPorts = GETNUMPORTS(portRange); 448 } 449 } 450 (*av)++; (*ac)--; 451 452 /* 453 * Extract public port and optionally address. 454 */ 455 if ((sep = strchr(**av, ':')) != NULL) { 456 if (StrToAddrAndPortRange(**av, &r->paddr, protoName, 457 &portRange) != 0) 458 errx(EX_DATAERR, "redirect_port: " 459 "invalid public port range"); 460 } else { 461 r->paddr.s_addr = INADDR_ANY; 462 if (StrToPortRange(**av, protoName, &portRange) != 0) 463 errx(EX_DATAERR, "redirect_port: " 464 "invalid public port range"); 465 } 466 467 r->pport = GETLOPORT(portRange); 468 if (r->proto == IPPROTO_SCTP) { /* so the logic below still works */ 469 numLocalPorts = GETNUMPORTS(portRange); 470 r->lport = r->pport; 471 } 472 r->pport_cnt = GETNUMPORTS(portRange); 473 (*av)++; (*ac)--; 474 475 /* 476 * Extract remote address and optionally port. 477 */ 478 /* 479 * NB: isdigit(**av) => we've to check that next parameter is really an 480 * option for this redirect entry, else stop here processing arg[cv]. 481 */ 482 if (*ac != 0 && isdigit(***av)) { 483 if ((sep = strchr(**av, ':')) != NULL) { 484 if (StrToAddrAndPortRange(**av, &r->raddr, protoName, 485 &portRange) != 0) 486 errx(EX_DATAERR, "redirect_port: " 487 "invalid remote port range"); 488 } else { 489 SETLOPORT(portRange, 0); 490 SETNUMPORTS(portRange, 1); 491 StrToAddr(**av, &r->raddr); 492 } 493 (*av)++; (*ac)--; 494 } else { 495 SETLOPORT(portRange, 0); 496 SETNUMPORTS(portRange, 1); 497 r->raddr.s_addr = INADDR_ANY; 498 } 499 r->rport = GETLOPORT(portRange); 500 r->rport_cnt = GETNUMPORTS(portRange); 501 502 /* 503 * Make sure port ranges match up, then add the redirect ports. 504 */ 505 if (numLocalPorts != r->pport_cnt) 506 errx(EX_DATAERR, "redirect_port: " 507 "port ranges must be equal in size"); 508 509 /* Remote port range is allowed to be '0' which means all ports. */ 510 if (r->rport_cnt != numLocalPorts && 511 (r->rport_cnt != 1 || r->rport != 0)) 512 errx(EX_DATAERR, "redirect_port: remote port must" 513 "be 0 or equal to local port range in size"); 514 515 /* Setup LSNAT server pool. */ 516 if (lsnat != NULL) { 517 struct cfg_spool *spool; 518 519 sep = strtok(lsnat, ","); 520 while (sep != NULL) { 521 spool = (struct cfg_spool *)buf; 522 space += sizeof(struct cfg_spool); 523 /* 524 * The sctp nat does not allow the port numbers to 525 * be mapped to new port numbers. Therefore, no ports 526 * are to be specified in the target port field. 527 */ 528 if (r->proto == IPPROTO_SCTP) { 529 if (strchr (sep, ':')) { 530 errx(EX_DATAERR, "redirect_port:" 531 "port numbers do not change in " 532 "sctp, so do not specify them as " 533 "part of the target"); 534 } else { 535 StrToAddr(sep, &spool->addr); 536 spool->port = r->pport; 537 } 538 } else { 539 if (StrToAddrAndPortRange(sep, &spool->addr, 540 protoName, &portRange) != 0) 541 errx(EX_DATAERR, "redirect_port:" 542 "invalid local port range"); 543 if (GETNUMPORTS(portRange) != 1) 544 errx(EX_DATAERR, "redirect_port: " 545 "local port must be single in " 546 "this context"); 547 spool->port = GETLOPORT(portRange); 548 } 549 r->spool_cnt++; 550 /* Point to the next possible cfg_spool. */ 551 buf = &buf[sizeof(struct cfg_spool)]; 552 sep = strtok(NULL, ","); 553 } 554 } 555 556 return (space); 557 } 558 559 static int 560 setup_redir_proto(char *buf, int *ac, char ***av) 561 { 562 struct cfg_redir *r; 563 struct protoent *protoent; 564 size_t space; 565 566 r = (struct cfg_redir *)buf; 567 r->mode = REDIR_PROTO; 568 /* Skip cfg_redir at beginning of buf. */ 569 buf = &buf[sizeof(struct cfg_redir)]; 570 space = sizeof(struct cfg_redir); 571 572 /* 573 * Extract protocol. 574 */ 575 protoent = getprotobyname(**av); 576 if (protoent == NULL) 577 errx(EX_DATAERR, "redirect_proto: unknown protocol %s", **av); 578 else 579 r->proto = protoent->p_proto; 580 581 (*av)++; (*ac)--; 582 583 /* 584 * Extract local address. 585 */ 586 StrToAddr(**av, &r->laddr); 587 588 (*av)++; (*ac)--; 589 590 /* 591 * Extract optional public address. 592 */ 593 if (*ac == 0) { 594 r->paddr.s_addr = INADDR_ANY; 595 r->raddr.s_addr = INADDR_ANY; 596 } else { 597 /* see above in setup_redir_port() */ 598 if (isdigit(***av)) { 599 StrToAddr(**av, &r->paddr); 600 (*av)++; (*ac)--; 601 602 /* 603 * Extract optional remote address. 604 */ 605 /* see above in setup_redir_port() */ 606 if (*ac != 0 && isdigit(***av)) { 607 StrToAddr(**av, &r->raddr); 608 (*av)++; (*ac)--; 609 } 610 } 611 } 612 613 return (space); 614 } 615 616 static void 617 print_nat_config(unsigned char *buf) 618 { 619 struct cfg_nat *n; 620 int i, cnt, flag, off; 621 struct cfg_redir *t; 622 struct cfg_spool *s; 623 struct protoent *p; 624 625 n = (struct cfg_nat *)buf; 626 flag = 1; 627 off = sizeof(*n); 628 printf("ipfw nat %u config", n->id); 629 if (strlen(n->if_name) != 0) 630 printf(" if %s", n->if_name); 631 else if (n->ip.s_addr != 0) 632 printf(" ip %s", inet_ntoa(n->ip)); 633 while (n->mode != 0) { 634 if (n->mode & PKT_ALIAS_LOG) { 635 printf(" log"); 636 n->mode &= ~PKT_ALIAS_LOG; 637 } else if (n->mode & PKT_ALIAS_DENY_INCOMING) { 638 printf(" deny_in"); 639 n->mode &= ~PKT_ALIAS_DENY_INCOMING; 640 } else if (n->mode & PKT_ALIAS_SAME_PORTS) { 641 printf(" same_ports"); 642 n->mode &= ~PKT_ALIAS_SAME_PORTS; 643 } else if (n->mode & PKT_ALIAS_SKIP_GLOBAL) { 644 printf(" skip_global"); 645 n->mode &= ~PKT_ALIAS_SKIP_GLOBAL; 646 } else if (n->mode & PKT_ALIAS_UNREGISTERED_ONLY) { 647 printf(" unreg_only"); 648 n->mode &= ~PKT_ALIAS_UNREGISTERED_ONLY; 649 } else if (n->mode & PKT_ALIAS_RESET_ON_ADDR_CHANGE) { 650 printf(" reset"); 651 n->mode &= ~PKT_ALIAS_RESET_ON_ADDR_CHANGE; 652 } else if (n->mode & PKT_ALIAS_REVERSE) { 653 printf(" reverse"); 654 n->mode &= ~PKT_ALIAS_REVERSE; 655 } else if (n->mode & PKT_ALIAS_PROXY_ONLY) { 656 printf(" proxy_only"); 657 n->mode &= ~PKT_ALIAS_PROXY_ONLY; 658 } 659 } 660 /* Print all the redirect's data configuration. */ 661 for (cnt = 0; cnt < n->redir_cnt; cnt++) { 662 t = (struct cfg_redir *)&buf[off]; 663 off += SOF_REDIR; 664 switch (t->mode) { 665 case REDIR_ADDR: 666 printf(" redirect_addr"); 667 if (t->spool_cnt == 0) 668 printf(" %s", inet_ntoa(t->laddr)); 669 else 670 for (i = 0; i < t->spool_cnt; i++) { 671 s = (struct cfg_spool *)&buf[off]; 672 if (i) 673 printf(","); 674 else 675 printf(" "); 676 printf("%s", inet_ntoa(s->addr)); 677 off += SOF_SPOOL; 678 } 679 printf(" %s", inet_ntoa(t->paddr)); 680 break; 681 case REDIR_PORT: 682 p = getprotobynumber(t->proto); 683 printf(" redirect_port %s ", p->p_name); 684 if (!t->spool_cnt) { 685 printf("%s:%u", inet_ntoa(t->laddr), t->lport); 686 if (t->pport_cnt > 1) 687 printf("-%u", t->lport + 688 t->pport_cnt - 1); 689 } else 690 for (i=0; i < t->spool_cnt; i++) { 691 s = (struct cfg_spool *)&buf[off]; 692 if (i) 693 printf(","); 694 printf("%s:%u", inet_ntoa(s->addr), 695 s->port); 696 off += SOF_SPOOL; 697 } 698 699 printf(" "); 700 if (t->paddr.s_addr) 701 printf("%s:", inet_ntoa(t->paddr)); 702 printf("%u", t->pport); 703 if (!t->spool_cnt && t->pport_cnt > 1) 704 printf("-%u", t->pport + t->pport_cnt - 1); 705 706 if (t->raddr.s_addr) { 707 printf(" %s", inet_ntoa(t->raddr)); 708 if (t->rport) { 709 printf(":%u", t->rport); 710 if (!t->spool_cnt && t->rport_cnt > 1) 711 printf("-%u", t->rport + 712 t->rport_cnt - 1); 713 } 714 } 715 break; 716 case REDIR_PROTO: 717 p = getprotobynumber(t->proto); 718 printf(" redirect_proto %s %s", p->p_name, 719 inet_ntoa(t->laddr)); 720 if (t->paddr.s_addr != 0) { 721 printf(" %s", inet_ntoa(t->paddr)); 722 if (t->raddr.s_addr) 723 printf(" %s", inet_ntoa(t->raddr)); 724 } 725 break; 726 default: 727 errx(EX_DATAERR, "unknown redir mode"); 728 break; 729 } 730 } 731 printf("\n"); 732 } 733 734 void 735 ipfw_config_nat(int ac, char **av) 736 { 737 struct cfg_nat *n; /* Nat instance configuration. */ 738 int i, off, tok, ac1; 739 char *id, *buf, **av1, *end; 740 size_t len; 741 742 av++; 743 ac--; 744 /* Nat id. */ 745 if (ac == 0) 746 errx(EX_DATAERR, "missing nat id"); 747 id = *av; 748 i = (int)strtol(id, &end, 0); 749 if (i <= 0 || *end != '\0') 750 errx(EX_DATAERR, "illegal nat id: %s", id); 751 av++; 752 ac--; 753 if (ac == 0) 754 errx(EX_DATAERR, "missing option"); 755 756 len = sizeof(struct cfg_nat); 757 ac1 = ac; 758 av1 = av; 759 while (ac1 > 0) { 760 tok = match_token(nat_params, *av1); 761 ac1--; 762 av1++; 763 switch (tok) { 764 case TOK_IP: 765 case TOK_IF: 766 ac1--; 767 av1++; 768 break; 769 case TOK_ALOG: 770 case TOK_DENY_INC: 771 case TOK_SAME_PORTS: 772 case TOK_SKIP_GLOBAL: 773 case TOK_UNREG_ONLY: 774 case TOK_RESET_ADDR: 775 case TOK_ALIAS_REV: 776 case TOK_PROXY_ONLY: 777 break; 778 case TOK_REDIR_ADDR: 779 if (ac1 < 2) 780 errx(EX_DATAERR, "redirect_addr: " 781 "not enough arguments"); 782 len += estimate_redir_addr(&ac1, &av1); 783 av1 += 2; 784 ac1 -= 2; 785 break; 786 case TOK_REDIR_PORT: 787 if (ac1 < 3) 788 errx(EX_DATAERR, "redirect_port: " 789 "not enough arguments"); 790 av1++; 791 ac1--; 792 len += estimate_redir_port(&ac1, &av1); 793 av1 += 2; 794 ac1 -= 2; 795 /* Skip optional remoteIP/port */ 796 if (ac1 != 0 && isdigit(**av1)) { 797 av1++; 798 ac1--; 799 } 800 break; 801 case TOK_REDIR_PROTO: 802 if (ac1 < 2) 803 errx(EX_DATAERR, "redirect_proto: " 804 "not enough arguments"); 805 len += sizeof(struct cfg_redir); 806 av1 += 2; 807 ac1 -= 2; 808 /* Skip optional remoteIP/port */ 809 if (ac1 != 0 && isdigit(**av1)) { 810 av1++; 811 ac1--; 812 } 813 if (ac1 != 0 && isdigit(**av1)) { 814 av1++; 815 ac1--; 816 } 817 break; 818 default: 819 errx(EX_DATAERR, "unrecognised option ``%s''", av1[-1]); 820 } 821 } 822 823 if ((buf = malloc(len)) == NULL) 824 errx(EX_OSERR, "malloc failed"); 825 826 /* Offset in buf: save space for n at the beginning. */ 827 off = sizeof(*n); 828 memset(buf, 0, len); 829 n = (struct cfg_nat *)buf; 830 n->id = i; 831 832 while (ac > 0) { 833 tok = match_token(nat_params, *av); 834 ac--; 835 av++; 836 switch (tok) { 837 case TOK_IP: 838 if (ac == 0) 839 errx(EX_DATAERR, "missing option"); 840 if (!inet_aton(av[0], &(n->ip))) 841 errx(EX_DATAERR, "bad ip address ``%s''", 842 av[0]); 843 ac--; 844 av++; 845 break; 846 case TOK_IF: 847 if (ac == 0) 848 errx(EX_DATAERR, "missing option"); 849 set_addr_dynamic(av[0], n); 850 ac--; 851 av++; 852 break; 853 case TOK_ALOG: 854 n->mode |= PKT_ALIAS_LOG; 855 break; 856 case TOK_DENY_INC: 857 n->mode |= PKT_ALIAS_DENY_INCOMING; 858 break; 859 case TOK_SAME_PORTS: 860 n->mode |= PKT_ALIAS_SAME_PORTS; 861 break; 862 case TOK_UNREG_ONLY: 863 n->mode |= PKT_ALIAS_UNREGISTERED_ONLY; 864 break; 865 case TOK_SKIP_GLOBAL: 866 n->mode |= PKT_ALIAS_SKIP_GLOBAL; 867 break; 868 case TOK_RESET_ADDR: 869 n->mode |= PKT_ALIAS_RESET_ON_ADDR_CHANGE; 870 break; 871 case TOK_ALIAS_REV: 872 n->mode |= PKT_ALIAS_REVERSE; 873 break; 874 case TOK_PROXY_ONLY: 875 n->mode |= PKT_ALIAS_PROXY_ONLY; 876 break; 877 /* 878 * All the setup_redir_* functions work directly in 879 * the final buffer, see above for details. 880 */ 881 case TOK_REDIR_ADDR: 882 case TOK_REDIR_PORT: 883 case TOK_REDIR_PROTO: 884 switch (tok) { 885 case TOK_REDIR_ADDR: 886 i = setup_redir_addr(&buf[off], &ac, &av); 887 break; 888 case TOK_REDIR_PORT: 889 i = setup_redir_port(&buf[off], &ac, &av); 890 break; 891 case TOK_REDIR_PROTO: 892 i = setup_redir_proto(&buf[off], &ac, &av); 893 break; 894 } 895 n->redir_cnt++; 896 off += i; 897 break; 898 } 899 } 900 901 i = do_cmd(IP_FW_NAT_CFG, buf, off); 902 if (i) 903 err(1, "setsockopt(%s)", "IP_FW_NAT_CFG"); 904 905 if (!co.do_quiet) { 906 /* After every modification, we show the resultant rule. */ 907 int _ac = 3; 908 const char *_av[] = {"show", "config", id}; 909 ipfw_show_nat(_ac, (char **)(void *)_av); 910 } 911 } 912 913 914 void 915 ipfw_show_nat(int ac, char **av) 916 { 917 struct cfg_nat *n; 918 struct cfg_redir *e; 919 int cmd, i, nbytes, do_cfg, do_rule, frule, lrule, nalloc, size; 920 int nat_cnt, redir_cnt, r; 921 uint8_t *data, *p; 922 char *endptr; 923 924 do_rule = 0; 925 nalloc = 1024; 926 size = 0; 927 data = NULL; 928 frule = 0; 929 lrule = IPFW_DEFAULT_RULE; /* max ipfw rule number */ 930 ac--; 931 av++; 932 933 if (co.test_only) 934 return; 935 936 /* Parse parameters. */ 937 for (cmd = IP_FW_NAT_GET_LOG, do_cfg = 0; ac != 0; ac--, av++) { 938 if (!strncmp(av[0], "config", strlen(av[0]))) { 939 cmd = IP_FW_NAT_GET_CONFIG, do_cfg = 1; 940 continue; 941 } 942 /* Convert command line rule #. */ 943 frule = lrule = strtoul(av[0], &endptr, 10); 944 if (*endptr == '-') 945 lrule = strtoul(endptr+1, &endptr, 10); 946 if (lrule == 0) 947 err(EX_USAGE, "invalid rule number: %s", av[0]); 948 do_rule = 1; 949 } 950 951 nbytes = nalloc; 952 while (nbytes >= nalloc) { 953 nalloc = nalloc * 2; 954 nbytes = nalloc; 955 data = safe_realloc(data, nbytes); 956 if (do_cmd(cmd, data, (uintptr_t)&nbytes) < 0) 957 err(EX_OSERR, "getsockopt(IP_FW_GET_%s)", 958 (cmd == IP_FW_NAT_GET_LOG) ? "LOG" : "CONFIG"); 959 } 960 if (nbytes == 0) 961 exit(0); 962 if (do_cfg) { 963 nat_cnt = *((int *)data); 964 for (i = sizeof(nat_cnt); nat_cnt; nat_cnt--) { 965 n = (struct cfg_nat *)&data[i]; 966 if (frule <= n->id && lrule >= n->id) 967 print_nat_config(&data[i]); 968 i += sizeof(struct cfg_nat); 969 for (redir_cnt = 0; redir_cnt < n->redir_cnt; redir_cnt++) { 970 e = (struct cfg_redir *)&data[i]; 971 i += sizeof(struct cfg_redir) + e->spool_cnt * 972 sizeof(struct cfg_spool); 973 } 974 } 975 } else { 976 for (i = 0; 1; i += LIBALIAS_BUF_SIZE + sizeof(int)) { 977 p = &data[i]; 978 if (p == data + nbytes) 979 break; 980 bcopy(p, &r, sizeof(int)); 981 if (do_rule) { 982 if (!(frule <= r && lrule >= r)) 983 continue; 984 } 985 printf("nat %u: %s\n", r, p+sizeof(int)); 986 } 987 } 988 } 989