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