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