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: stable/10/sbin/ipfw/nat.c 278324 2015-02-06 18:13:29Z jhb $
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
set_addr_dynamic(const char * ifn,struct cfg_nat * n)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 n->ip.s_addr = htonl(INADDR_ANY);
160 else
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
StrToAddr(const char * str,struct in_addr * addr)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
StrToPortRange(const char * str,const char * proto,port_range * portRange)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
StrToProto(const char * str)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
StrToAddrAndPortRange(const char * str,struct in_addr * addr,char * proto,port_range * portRange)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
estimate_redir_addr(int * ac,char *** av)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
setup_redir_addr(char * buf,int * ac,char *** av)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
estimate_redir_port(int * ac,char *** av)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
setup_redir_port(char * buf,int * ac,char *** av)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
setup_redir_proto(char * buf,int * ac,char *** av)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
print_nat_config(unsigned char * buf)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
ipfw_config_nat(int ac,char ** av)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
ipfw_show_nat(int ac,char ** av)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