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
49static 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 */
73static void
74set_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
193static void
194StrToAddr (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
208static int
209StrToPortRange (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
252static int
253StrToProto (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
266static int
267StrToAddrAndPortRange (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
314static int
315estimate_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
335static int
336setup_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
376static int
377estimate_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
397static int
398setup_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
561static int
562setup_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
618static void
619print_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
736void
737ipfw_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
916void
917ipfw_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