xref: /dragonfly/sbin/ipfw/ipfw2.c (revision b272101a)
1 /*
2  * Copyright (c) 2002 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: src/sbin/ipfw/ipfw2.c,v 1.4.2.13 2003/05/27 22:21:11 gshapiro Exp $
21  */
22 
23 #include <sys/param.h>
24 #include <sys/mbuf.h>
25 #include <sys/socket.h>
26 #include <sys/sockio.h>
27 #include <sys/sysctl.h>
28 #include <sys/time.h>
29 #include <sys/wait.h>
30 
31 #include <ctype.h>
32 #include <err.h>
33 #include <errno.h>
34 #include <grp.h>
35 #include <limits.h>
36 #include <netdb.h>
37 #include <pwd.h>
38 #include <signal.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <stdarg.h>
42 #include <string.h>
43 #include <timeconv.h>
44 #include <unistd.h>
45 #include <sysexits.h>
46 
47 #include <net/if.h>
48 #include <netinet/in.h>
49 #include <netinet/in_systm.h>
50 #include <netinet/ip.h>
51 #include <netinet/ip_icmp.h>
52 #include <net/ipfw/ip_fw.h>
53 #include <net/route.h> /* def. of struct route */
54 #include <net/ethernet.h>
55 #include <net/dummynet/ip_dummynet.h>
56 #include <netinet/tcp.h>
57 #include <arpa/inet.h>
58 
59 int		s,			/* main RAW socket */
60 		do_resolv,		/* Would try to resolve all */
61 		do_acct,		/* Show packet/byte count */
62 		do_time,		/* Show time stamps */
63 		do_quiet,		/* Be quiet in add and flush */
64 		do_force,		/* Don't ask for confirmation */
65 		do_pipe,		/* this cmd refers to a pipe */
66 		do_table,		/* this cmd referes to a table */
67 		do_sort,		/* field to sort results (0 = no) */
68 		do_dynamic,		/* display dynamic rules */
69 		do_expired,		/* display expired dynamic rules */
70 		do_compact,		/* show rules in compact mode */
71 		show_sets,		/* display rule sets */
72 		verbose;
73 
74 #define	IP_MASK_ALL	0xffffffff
75 
76 /*
77  * structure to hold flag names and associated values to be
78  * set in the appropriate masks.
79  * A NULL string terminates the array.
80  * Often, an element with 0 value contains an error string.
81  *
82  */
83 struct _s_x {
84 	const char *s;
85 	uint32_t x;
86 };
87 
88 static struct _s_x f_tcpflags[] = {
89 	{ "syn", TH_SYN },
90 	{ "fin", TH_FIN },
91 	{ "ack", TH_ACK },
92 	{ "psh", TH_PUSH },
93 	{ "rst", TH_RST },
94 	{ "urg", TH_URG },
95 	{ "tcp flag", 0 },
96 	{ NULL,	0 }
97 };
98 
99 static struct _s_x f_tcpopts[] = {
100 	{ "mss",	IP_FW_TCPOPT_MSS },
101 	{ "maxseg",	IP_FW_TCPOPT_MSS },
102 	{ "window",	IP_FW_TCPOPT_WINDOW },
103 	{ "sack",	IP_FW_TCPOPT_SACK },
104 	{ "ts",		IP_FW_TCPOPT_TS },
105 	{ "timestamp",	IP_FW_TCPOPT_TS },
106 	{ "cc",		IP_FW_TCPOPT_CC },
107 	{ "tcp option",	0 },
108 	{ NULL,	0 }
109 };
110 
111 /*
112  * IP options span the range 0 to 255 so we need to remap them
113  * (though in fact only the low 5 bits are significant).
114  */
115 static struct _s_x f_ipopts[] = {
116 	{ "ssrr",	IP_FW_IPOPT_SSRR},
117 	{ "lsrr",	IP_FW_IPOPT_LSRR},
118 	{ "rr",		IP_FW_IPOPT_RR},
119 	{ "ts",		IP_FW_IPOPT_TS},
120 	{ "ip option",	0 },
121 	{ NULL,	0 }
122 };
123 
124 static struct _s_x f_iptos[] = {
125 	{ "lowdelay",	IPTOS_LOWDELAY},
126 	{ "throughput",	IPTOS_THROUGHPUT},
127 	{ "reliability", IPTOS_RELIABILITY},
128 	{ "mincost",	IPTOS_MINCOST},
129 	{ "congestion",	IPTOS_CE},
130 	{ "ecntransport", IPTOS_ECT},
131 	{ "ip tos option", 0},
132 	{ NULL,	0 }
133 };
134 
135 static struct _s_x limit_masks[] = {
136 	{"all",		DYN_SRC_ADDR|DYN_SRC_PORT|DYN_DST_ADDR|DYN_DST_PORT},
137 	{"src-addr",	DYN_SRC_ADDR},
138 	{"src-port",	DYN_SRC_PORT},
139 	{"dst-addr",	DYN_DST_ADDR},
140 	{"dst-port",	DYN_DST_PORT},
141 	{NULL,		0}
142 };
143 
144 /*
145  * we use IPPROTO_ETHERTYPE as a fake protocol id to call the print routines
146  * This is only used in this code.
147  */
148 #define IPPROTO_ETHERTYPE	0x1000
149 static struct _s_x ether_types[] = {
150     /*
151      * Note, we cannot use "-:&/" in the names because they are field
152      * separators in the type specifications. Also, we use s = NULL as
153      * end-delimiter, because a type of 0 can be legal.
154      */
155 	{ "ip",		0x0800 },
156 	{ "ipv4",	0x0800 },
157 	{ "ipv6",	0x86dd },
158 	{ "arp",	0x0806 },
159 	{ "rarp",	0x8035 },
160 	{ "vlan",	0x8100 },
161 	{ "loop",	0x9000 },
162 	{ "trail",	0x1000 },
163 	{ "pppoe_disc",	0x8863 },
164 	{ "pppoe_sess",	0x8864 },
165 	{ "ipx_8022",	0x00E0 },
166 	{ "ipx_8023",	0x0000 },
167 	{ "ipx_ii",	0x8137 },
168 	{ "ipx_snap",	0x8137 },
169 	{ "ipx",	0x8137 },
170 	{ "ns",		0x0600 },
171 	{ NULL,		0 }
172 };
173 
174 static void show_usage(void);
175 
176 enum tokens {
177 	TOK_NULL=0,
178 
179 	TOK_OR,
180 	TOK_NOT,
181 	TOK_STARTBRACE,
182 	TOK_ENDBRACE,
183 
184 	TOK_ACCEPT,
185 	TOK_COUNT,
186 	TOK_DEFRAG,
187 	TOK_PIPE,
188 	TOK_QUEUE,
189 	TOK_DIVERT,
190 	TOK_TEE,
191 	TOK_FORWARD,
192 	TOK_SKIPTO,
193 	TOK_DENY,
194 	TOK_REJECT,
195 	TOK_RESET,
196 	TOK_UNREACH,
197 	TOK_CHECKSTATE,
198 
199 	TOK_UID,
200 	TOK_GID,
201 	TOK_IN,
202 	TOK_LIMIT,
203 	TOK_KEEPSTATE,
204 	TOK_REDIRECT,
205 	TOK_LAYER2,
206 	TOK_OUT,
207 	TOK_XMIT,
208 	TOK_RECV,
209 	TOK_VIA,
210 	TOK_FRAG,
211 	TOK_IPFRAG,
212 	TOK_IPOPTS,
213 	TOK_IPLEN,
214 	TOK_IPID,
215 	TOK_IPPRECEDENCE,
216 	TOK_IPTOS,
217 	TOK_IPTTL,
218 	TOK_IPVER,
219 	TOK_ESTAB,
220 	TOK_SETUP,
221 	TOK_TCPFLAGS,
222 	TOK_TCPOPTS,
223 	TOK_TCPSEQ,
224 	TOK_TCPACK,
225 	TOK_TCPWIN,
226 	TOK_ICMPCODES,
227 	TOK_ICMPTYPES,
228 	TOK_MAC,
229 	TOK_MACTYPE,
230 
231 	TOK_PLR,
232 	TOK_NOERROR,
233 	TOK_BUCKETS,
234 	TOK_DSTIP,
235 	TOK_SRCIP,
236 	TOK_DSTPORT,
237 	TOK_SRCPORT,
238 	TOK_ALL,
239 	TOK_MASK,
240 	TOK_BW,
241 	TOK_DELAY,
242 	TOK_RED,
243 	TOK_GRED,
244 	TOK_DROPTAIL,
245 	TOK_PROTO,
246 	TOK_WEIGHT,
247 };
248 
249 struct _s_x dummynet_params[] = {
250 	{ "plr",		TOK_PLR },
251 	{ "noerror",		TOK_NOERROR },
252 	{ "buckets",		TOK_BUCKETS },
253 	{ "dst-ip",		TOK_DSTIP },
254 	{ "src-ip",		TOK_SRCIP },
255 	{ "dst-port",		TOK_DSTPORT },
256 	{ "src-port",		TOK_SRCPORT },
257 	{ "proto",		TOK_PROTO },
258 	{ "weight",		TOK_WEIGHT },
259 	{ "all",		TOK_ALL },
260 	{ "mask",		TOK_MASK },
261 	{ "droptail",		TOK_DROPTAIL },
262 	{ "red",		TOK_RED },
263 	{ "gred",		TOK_GRED },
264 	{ "bw",			TOK_BW },
265 	{ "bandwidth",		TOK_BW },
266 	{ "delay",		TOK_DELAY },
267 	{ "pipe",		TOK_PIPE },
268 	{ "queue",		TOK_QUEUE },
269 	{ "dummynet-params",	TOK_NULL },
270 	{ NULL, 0 }
271 };
272 
273 struct _s_x rule_actions[] = {
274 	{ "accept",		TOK_ACCEPT },
275 	{ "pass",		TOK_ACCEPT },
276 	{ "allow",		TOK_ACCEPT },
277 	{ "permit",		TOK_ACCEPT },
278 	{ "count",		TOK_COUNT },
279 	{ "pipe",		TOK_PIPE },
280 	{ "queue",		TOK_QUEUE },
281 	{ "divert",		TOK_DIVERT },
282 	{ "tee",		TOK_TEE },
283 	{ "fwd",		TOK_FORWARD },
284 	{ "forward",		TOK_FORWARD },
285 	{ "skipto",		TOK_SKIPTO },
286 	{ "deny",		TOK_DENY },
287 	{ "drop",		TOK_DENY },
288 	{ "reject",		TOK_REJECT },
289 	{ "reset",		TOK_RESET },
290 	{ "unreach",		TOK_UNREACH },
291 	{ "check-state",	TOK_CHECKSTATE },
292 	{ "defrag",		TOK_DEFRAG },
293 	{ NULL,			TOK_NULL },
294 	{ NULL, 0 }
295 };
296 
297 struct _s_x rule_options[] = {
298 	{ "uid",		TOK_UID },
299 	{ "gid",		TOK_GID },
300 	{ "in",			TOK_IN },
301 	{ "limit",		TOK_LIMIT },
302 	{ "keep-state",		TOK_KEEPSTATE },
303 	{ "redirect",		TOK_REDIRECT },
304 	{ "rdr",		TOK_REDIRECT },
305 	{ "layer2",		TOK_LAYER2 },
306 	{ "out",		TOK_OUT },
307 	{ "xmit",		TOK_XMIT },
308 	{ "recv",		TOK_RECV },
309 	{ "via",		TOK_VIA },
310 	{ "fragment",		TOK_FRAG },
311 	{ "frag",		TOK_FRAG },
312 	{ "ipfrag",		TOK_IPFRAG },
313 	{ "ipoptions",		TOK_IPOPTS },
314 	{ "ipopts",		TOK_IPOPTS },
315 	{ "iplen",		TOK_IPLEN },
316 	{ "ipid",		TOK_IPID },
317 	{ "ipprecedence",	TOK_IPPRECEDENCE },
318 	{ "iptos",		TOK_IPTOS },
319 	{ "ipttl",		TOK_IPTTL },
320 	{ "ipversion",		TOK_IPVER },
321 	{ "ipver",		TOK_IPVER },
322 	{ "estab",		TOK_ESTAB },
323 	{ "established",	TOK_ESTAB },
324 	{ "setup",		TOK_SETUP },
325 	{ "tcpflags",		TOK_TCPFLAGS },
326 	{ "tcpflgs",		TOK_TCPFLAGS },
327 	{ "tcpoptions",		TOK_TCPOPTS },
328 	{ "tcpopts",		TOK_TCPOPTS },
329 	{ "tcpseq",		TOK_TCPSEQ },
330 	{ "tcpack",		TOK_TCPACK },
331 	{ "tcpwin",		TOK_TCPWIN },
332 	{ "icmpcode",		TOK_ICMPCODES },
333 	{ "icmpcodes",		TOK_ICMPCODES },
334 	{ "icmptype",		TOK_ICMPTYPES },
335 	{ "icmptypes",		TOK_ICMPTYPES },
336 	{ "dst-ip",		TOK_DSTIP },
337 	{ "src-ip",		TOK_SRCIP },
338 	{ "dst-port",		TOK_DSTPORT },
339 	{ "src-port",		TOK_SRCPORT },
340 	{ "proto",		TOK_PROTO },
341 	{ "MAC",		TOK_MAC },
342 	{ "mac",		TOK_MAC },
343 	{ "mac-type",		TOK_MACTYPE },
344 
345 	{ "not",		TOK_NOT },		/* pseudo option */
346 	{ "!", /* escape ? */	TOK_NOT },		/* pseudo option */
347 	{ "or",			TOK_OR },		/* pseudo option */
348 	{ "|", /* escape */	TOK_OR },		/* pseudo option */
349 	{ "{",			TOK_STARTBRACE },	/* pseudo option */
350 	{ "(",			TOK_STARTBRACE },	/* pseudo option */
351 	{ "}",			TOK_ENDBRACE },		/* pseudo option */
352 	{ ")",			TOK_ENDBRACE },		/* pseudo option */
353 	{ NULL,			TOK_NULL },
354 	{ NULL, 0 }
355 };
356 
357 /**
358  * match_token takes a table and a string, returns the value associated
359  * with the string (0 meaning an error in most cases)
360  */
361 static int
match_token(struct _s_x * table,char * string)362 match_token(struct _s_x *table, char *string)
363 {
364 	struct _s_x *pt;
365 	int i = strlen(string);
366 
367 	for (pt = table ; i && pt->s != NULL ; pt++)
368 		if ((int)strlen(pt->s) == i && !bcmp(string, pt->s, i))
369 			return pt->x;
370 	return -1;
371 };
372 
373 static const char *
match_value(struct _s_x * p,u_int32_t value)374 match_value(struct _s_x *p, u_int32_t value)
375 {
376 	for (; p->s != NULL; p++)
377 		if (p->x == value)
378 			return p->s;
379 	return NULL;
380 }
381 
382 /*
383  * prints one port, symbolic or numeric
384  */
385 static void
print_port(int proto,u_int16_t port)386 print_port(int proto, u_int16_t port)
387 {
388 
389 	if (proto == IPPROTO_ETHERTYPE) {
390 		const char *str;
391 
392 		if (do_resolv && (str = match_value(ether_types, port)) )
393 			printf("%s", str);
394 		else
395 			printf("0x%04x", port);
396 	} else {
397 		struct servent *se = NULL;
398 		if (do_resolv) {
399 			struct protoent *pe = getprotobynumber(proto);
400 
401 			se = getservbyport(htons(port), pe ? pe->p_name : NULL);
402 		}
403 		if (se)
404 			printf("%s", se->s_name);
405 		else
406 			printf("%d", port);
407 	}
408 }
409 
410 /*
411  * print the values in a list of ports
412  * XXX todo: add support for mask.
413  */
414 static void
print_newports(ipfw_insn_u16 * cmd,int proto,int opcode)415 print_newports(ipfw_insn_u16 *cmd, int proto, int opcode)
416 {
417 	u_int16_t *p = cmd->ports;
418 	int i;
419 	const char *sep= " ";
420 
421 	if (cmd->o.len & F_NOT)
422 		printf(" not");
423 	if (opcode != 0)
424 		printf ("%s", opcode == O_MAC_TYPE ? " mac-type" :
425 		    (opcode == O_IP_DSTPORT ? " dst-port" : " src-port"));
426 	for (i = F_LEN((ipfw_insn *)cmd) - 1; i > 0; i--, p += 2) {
427 		printf("%s", sep);
428 		print_port(proto, p[0]);
429 		if (p[0] != p[1]) {
430 			printf("-");
431 			print_port(proto, p[1]);
432 		}
433 		sep = ",";
434 	}
435 }
436 
437 /*
438  * Like strtol, but also translates service names into port numbers
439  * for some protocols.
440  * In particular:
441  *	proto == -1 disables the protocol check;
442  *	proto == IPPROTO_ETHERTYPE looks up an internal table
443  *	proto == <some value in /etc/protocols> matches the values there.
444  * Returns *end == s in case the parameter is not found.
445  */
446 static int
strtoport(char * str,char ** end,int base,int proto)447 strtoport(char *str, char **end, int base, int proto)
448 {
449 	char *p, *buf;
450 	char *s1;
451 	int i;
452 
453 	*end = str;		/* default - not found */
454 	if (*str == '\0')
455 		return 0;	/* not found */
456 
457 	if (isdigit(*str))
458 		return strtol(str, end, base);
459 
460 	/*
461 	 * find separator. '\\' escapes the next char.
462 	 */
463 	for (s1 = str; *s1 && (isalnum(*s1) || *s1 == '\\') ; s1++)
464 		if (*s1 == '\\' && s1[1] != '\0')
465 			s1++;
466 
467 	buf = malloc(s1 - str + 1);
468 	if (buf == NULL)
469 		return 0;
470 
471 	/*
472 	 * copy into a buffer skipping backslashes
473 	 */
474 	for (p = str, i = 0; p != s1 ; p++)
475 		if ( *p != '\\')
476 			buf[i++] = *p;
477 	buf[i++] = '\0';
478 
479 	if (proto == IPPROTO_ETHERTYPE) {
480 		i = match_token(ether_types, buf);
481 		free(buf);
482 		if (i != -1) {	/* found */
483 			*end = s1;
484 			return i;
485 		}
486 	} else {
487 		struct protoent *pe = NULL;
488 		struct servent *se;
489 
490 		if (proto != 0)
491 			pe = getprotobynumber(proto);
492 		setservent(1);
493 		se = getservbyname(buf, pe ? pe->p_name : NULL);
494 		free(buf);
495 		if (se != NULL) {
496 			*end = s1;
497 			return ntohs(se->s_port);
498 		}
499 	}
500 	return 0;	/* not found */
501 }
502 
503 /*
504  * fill the body of the command with the list of port ranges.
505  * At the moment it only understands numeric ranges.
506  */
507 static int
fill_newports(ipfw_insn_u16 * cmd,char * av,int proto)508 fill_newports(ipfw_insn_u16 *cmd, char *av, int proto)
509 {
510 	u_int16_t *p = cmd->ports;
511 	int i = 0;
512 	char *str = av;
513 
514 	while (*str) {
515 		u_int16_t a, b;
516 
517 		a = strtoport(av, &str, 0, proto);
518 		if (str == av) /* no parameter */
519 			break;
520 		if (*str == '-') { /* a range */
521 			av = str+1;
522 			b = strtoport(av, &str, 0, proto);
523 			if (str == av) /* no parameter */
524 				break;
525 			p[0] = a;
526 			p[1] = b;
527 		} else if (*str == ',' || *str == '\0' ) {
528 			p[0] = p[1] = a;
529 		} else {	/* invalid separator */
530 			errx(EX_DATAERR, "invalid separator <%c> in <%s>\n",
531 				*str, av);
532 		}
533 		i++;
534 		p += 2;
535 		av = str+1;
536 	}
537 	if (i > 0) {
538 		if (i+1 > F_LEN_MASK)
539 			errx(EX_DATAERR, "too many ports/ranges\n");
540 		cmd->o.len |= i+1; /* leave F_NOT and F_OR untouched */
541 	}
542 	return i;
543 }
544 
545 static struct _s_x icmpcodes[] = {
546       { "net",			ICMP_UNREACH_NET },
547       { "host",			ICMP_UNREACH_HOST },
548       { "protocol",		ICMP_UNREACH_PROTOCOL },
549       { "port",			ICMP_UNREACH_PORT },
550       { "needfrag",		ICMP_UNREACH_NEEDFRAG },
551       { "srcfail",		ICMP_UNREACH_SRCFAIL },
552       { "net-unknown",		ICMP_UNREACH_NET_UNKNOWN },
553       { "host-unknown",		ICMP_UNREACH_HOST_UNKNOWN },
554       { "isolated",		ICMP_UNREACH_ISOLATED },
555       { "net-prohib",		ICMP_UNREACH_NET_PROHIB },
556       { "host-prohib",		ICMP_UNREACH_HOST_PROHIB },
557       { "tosnet",		ICMP_UNREACH_TOSNET },
558       { "toshost",		ICMP_UNREACH_TOSHOST },
559       { "filter-prohib",	ICMP_UNREACH_FILTER_PROHIB },
560       { "host-precedence",	ICMP_UNREACH_HOST_PRECEDENCE },
561       { "precedence-cutoff",	ICMP_UNREACH_PRECEDENCE_CUTOFF },
562       { NULL, 0 }
563 };
564 
565 static void
fill_reject_code(u_short * codep,char * str)566 fill_reject_code(u_short *codep, char *str)
567 {
568 	int val;
569 	char *s1;
570 
571 	val = strtoul(str, &s1, 0);
572 	if (s1 == str || *s1 != '\0' || val >= 0x100)
573 		val = match_token(icmpcodes, str);
574 	if (val < 0)
575 		errx(EX_DATAERR, "unknown ICMP unreachable code ``%s''", str);
576 	*codep = val;
577 	return;
578 }
579 
580 static void
print_reject_code(u_int16_t code)581 print_reject_code(u_int16_t code)
582 {
583 	const char *str = match_value(icmpcodes, code);
584 
585 	if (str != NULL)
586 		printf("unreach %s", str);
587 	else
588 		printf("unreach %u", code);
589 }
590 
591 /*
592  * Returns the number of bits set (from left) in a contiguous bitmask,
593  * or -1 if the mask is not contiguous.
594  * XXX this needs a proper fix.
595  * This effectively works on masks in big-endian (network) format.
596  * when compiled on little endian architectures.
597  *
598  * First bit is bit 7 of the first byte -- note, for MAC addresses,
599  * the first bit on the wire is bit 0 of the first byte.
600  * len is the max length in bits.
601  */
602 static int
contigmask(u_char * p,int len)603 contigmask(u_char *p, int len)
604 {
605 	int i, n;
606 	for (i=0; i<len ; i++)
607 		if ( (p[i/8] & (1 << (7 - (i%8)))) == 0) /* first bit unset */
608 			break;
609 	for (n=i+1; n < len; n++)
610 		if ( (p[n/8] & (1 << (7 - (n%8)))) != 0)
611 			return -1; /* mask not contiguous */
612 	return i;
613 }
614 
615 /*
616  * print flags set/clear in the two bitmasks passed as parameters.
617  * There is a specialized check for f_tcpflags.
618  */
619 static void
print_flags(const char * name,ipfw_insn * cmd,struct _s_x * list)620 print_flags(const char *name, ipfw_insn *cmd, struct _s_x *list)
621 {
622 	const char *comma="";
623 	int i;
624 	u_char set = cmd->arg1 & 0xff;
625 	u_char clear = (cmd->arg1 >> 8) & 0xff;
626 
627 	if (list == f_tcpflags && set == TH_SYN && clear == TH_ACK) {
628 		printf(" setup");
629 		return;
630 	}
631 
632 	printf(" %s ", name);
633 	for (i=0; list[i].x != 0; i++) {
634 		if (set & list[i].x) {
635 			set &= ~list[i].x;
636 			printf("%s%s", comma, list[i].s);
637 			comma = ",";
638 		}
639 		if (clear & list[i].x) {
640 			clear &= ~list[i].x;
641 			printf("%s!%s", comma, list[i].s);
642 			comma = ",";
643 		}
644 	}
645 }
646 
647 /*
648  * Print the ip address contained in a command.
649  */
650 static void
print_ip(ipfw_insn_ip * cmd,const char * str)651 print_ip(ipfw_insn_ip *cmd, const char *str)
652 {
653 	struct hostent *he = NULL;
654 	int mb;
655 
656 	printf("%s%s ", cmd->o.len & F_NOT ? " not": "", str);
657 
658 	if (cmd->o.opcode == O_IP_SRC_ME || cmd->o.opcode == O_IP_DST_ME) {
659 		printf("me");
660 		return;
661 	}
662 	if (cmd->o.opcode == O_IP_SRC_TABLE ||
663 	    cmd->o.opcode == O_IP_DST_TABLE) {
664 		printf("<%u>", cmd->o.arg1);
665 		return;
666 	}
667 	if (cmd->o.opcode == O_IP_SRC_IFIP ||
668 	    cmd->o.opcode == O_IP_DST_IFIP) {
669 		printf("[%s%s]", ((ipfw_insn_ifip *)cmd)->ifname,
670 		    (cmd->o.arg1 & IPFW_IFIP_NET) ? ":net" : "");
671 		return;
672 	}
673 	if (cmd->o.opcode == O_IP_SRC_SET || cmd->o.opcode == O_IP_DST_SET) {
674 		u_int32_t x, *d;
675 		int i;
676 		char comma = '{';
677 
678 		x = cmd->o.arg1 - 1;
679 		x = htonl( ~x );
680 		cmd->addr.s_addr = htonl(cmd->addr.s_addr);
681 		printf("%s/%d", inet_ntoa(cmd->addr),
682 			contigmask((u_char *)&x, 32));
683 		x = cmd->addr.s_addr = htonl(cmd->addr.s_addr);
684 		x &= 0xff; /* base */
685 		d = (u_int32_t *)&(cmd->mask);
686 		for (i=0; i < cmd->o.arg1; i++)
687 			if (d[ i/32] & (1<<(i & 31))) {
688 				printf("%c%d", comma, i+x);
689 				comma = ',';
690 			}
691 		printf("}");
692 		return;
693 	}
694 	if (cmd->o.opcode == O_IP_SRC || cmd->o.opcode == O_IP_DST)
695 		mb = 32;
696 	else
697 		mb = contigmask((u_char *)&(cmd->mask.s_addr), 32);
698 	if (mb == 32 && do_resolv)
699 		he = gethostbyaddr(&(cmd->addr.s_addr), sizeof(u_long),
700 		    AF_INET);
701 	if (he != NULL)		/* resolved to name */
702 		printf("%s", he->h_name);
703 	else if (mb == 0)	/* any */
704 		printf("any");
705 	else {		/* numeric IP followed by some kind of mask */
706 		printf("%s", inet_ntoa(cmd->addr));
707 		if (mb < 0)
708 			printf(":%s", inet_ntoa(cmd->mask));
709 		else if (mb < 32)
710 			printf("/%d", mb);
711 	}
712 }
713 
714 /*
715  * prints a MAC address/mask pair
716  */
717 static void
print_mac(u_char * addr,u_char * mask)718 print_mac(u_char *addr, u_char *mask)
719 {
720 	int l = contigmask(mask, 48);
721 
722 	if (l == 0)
723 		printf(" any");
724 	else {
725 		printf(" %02x:%02x:%02x:%02x:%02x:%02x",
726 		    addr[0], addr[1], addr[2], addr[3], addr[4], addr[5]);
727 		if (l == -1)
728 			printf("&%02x:%02x:%02x:%02x:%02x:%02x",
729 			    mask[0], mask[1], mask[2],
730 			    mask[3], mask[4], mask[5]);
731 		else if (l < 48)
732 			printf("/%d", l);
733 	}
734 }
735 
736 static void
fill_icmp(enum ipfw_opcodes op,ipfw_insn_u32 * cmd,char * av)737 fill_icmp(enum ipfw_opcodes op, ipfw_insn_u32 *cmd, char *av)
738 {
739 	u_int8_t type;
740 	int idx_max = 0, idx;
741 
742 	/* 256 / 32, (max icmp types / 32 bits). */
743 	for (idx = 0; idx < 8; ++idx)
744 		cmd->d[idx] = 0;
745 
746 	while (*av) {
747 		if (*av == ',')
748 			av++;
749 
750 		type = strtoul(av, &av, 0);
751 		if (*av != ',' && *av != '\0') {
752 			errx(EX_DATAERR, "invalid ICMP %s",
753 			    op == O_ICMPTYPE ? "types" : "codes");
754 		}
755 
756 		idx = type / 32;
757 		cmd->d[idx] |= 1 << (type % 32);
758 
759 		if (idx > idx_max)
760 			idx_max = idx;
761 	}
762 	cmd->o.opcode = op;
763 	cmd->o.len |= (F_INSN_SIZE(ipfw_insn_u32) + idx_max);
764 }
765 
766 static void
print_icmp(ipfw_insn_u32 * cmd)767 print_icmp(ipfw_insn_u32 *cmd)
768 {
769 	int idx, idx_max;
770 	char sep= ' ';
771 
772 	idx_max = F_LEN(&cmd->o) - F_INSN_SIZE(ipfw_insn);
773 
774 	if (cmd->o.opcode == O_ICMPTYPE)
775 		printf(" icmptypes");
776 	else
777 		printf(" icmpcodes");
778 	for (idx = 0; idx < idx_max; ++idx) {
779 		uint32_t types = cmd->d[idx];
780 
781 		while (types != 0) {
782 			int type_shift = ffs(types) - 1;
783 
784 			types &= ~(1 << type_shift);
785 			printf("%c%d", sep, (idx * 32) + type_shift);
786 			sep = ',';
787 		}
788 	}
789 }
790 
791 /*
792  * show_ipfw() prints the body of an ipfw rule.
793  * Because the standard rule has at least proto src_ip dst_ip, we use
794  * a helper function to produce these entries if not provided explicitly.
795  * The first argument is the list of fields we have, the second is
796  * the list of fields we want to be printed.
797  *
798  * Special cases if we have provided a MAC header:
799  *   + if the rule does not contain IP addresses/ports, do not print them;
800  *   + if the rule does not contain an IP proto, print "all" instead of "ip";
801  *
802  * Once we have 'have_options', IP header fields are printed as options.
803  */
804 #define	HAVE_PROTO	0x0001
805 #define	HAVE_SRCIP	0x0002
806 #define	HAVE_DSTIP	0x0004
807 #define	HAVE_MAC	0x0008
808 #define	HAVE_MACTYPE	0x0010
809 #define	HAVE_OPTIONS	0x8000
810 
811 #define	HAVE_IP		(HAVE_PROTO | HAVE_SRCIP | HAVE_DSTIP)
812 static void
show_prerequisites(int * flags,int want,int cmd)813 show_prerequisites(int *flags, int want, int cmd)
814 {
815 	if ( (*flags & HAVE_IP) == HAVE_IP)
816 		*flags |= HAVE_OPTIONS;
817 
818 	if ( (*flags & (HAVE_MAC|HAVE_MACTYPE|HAVE_OPTIONS)) == HAVE_MAC &&
819 	     cmd != O_MAC_TYPE) {
820 		/*
821 		 * mac-type was optimized out by the compiler,
822 		 * restore it
823 		 */
824 		printf(" any");
825 		*flags |= HAVE_MACTYPE | HAVE_OPTIONS;
826 		return;
827 	}
828 	if ( !(*flags & HAVE_OPTIONS)) {
829 		if ( !(*flags & HAVE_PROTO) && (want & HAVE_PROTO))
830 			printf(" ip");
831 		if ( !(*flags & HAVE_SRCIP) && (want & HAVE_SRCIP))
832 			printf(" from any");
833 		if ( !(*flags & HAVE_DSTIP) && (want & HAVE_DSTIP))
834 			printf(" to any");
835 	}
836 	*flags |= want;
837 }
838 
839 static void
show_ipfw(struct ipfw_ioc_rule * rule,int pcwidth,int bcwidth)840 show_ipfw(struct ipfw_ioc_rule *rule, int pcwidth, int bcwidth)
841 {
842 	static int twidth = 0;
843 	int l;
844 	ipfw_insn *cmd;
845 	int proto = 0;		/* default */
846 	int flags = 0;	/* prerequisites */
847 	ipfw_insn_log *logptr = NULL; /* set if we find an O_LOG */
848 	int or_block = 0;	/* we are in an or block */
849 
850 	u_int32_t set_disable = rule->set_disable;
851 
852 	if (set_disable & (1 << rule->set)) { /* disabled */
853 		if (!show_sets)
854 			return;
855 		else
856 			printf("# DISABLED ");
857 	}
858 	printf("%05u ", rule->rulenum);
859 
860 	if (do_acct)
861 		printf("%*ju %*ju ", pcwidth, (uintmax_t)rule->pcnt, bcwidth,
862 		    (uintmax_t)rule->bcnt);
863 
864 	if (do_time) {
865 		char timestr[30];
866 
867 		if (twidth == 0) {
868 			time_t t0 = 0;
869 
870 			strcpy(timestr, ctime(&t0));
871 			*strchr(timestr, '\n') = '\0';
872 			twidth = strlen(timestr);
873 		}
874 		if (rule->timestamp) {
875 			time_t t = _long_to_time(rule->timestamp);
876 
877 			strcpy(timestr, ctime(&t));
878 			*strchr(timestr, '\n') = '\0';
879 			printf("%s ", timestr);
880 		} else {
881 			printf("%*s ", twidth, " ");
882 		}
883 	}
884 
885 	if (show_sets)
886 		printf("set %d ", rule->set);
887 
888 	/*
889 	 * print the optional "match probability"
890 	 */
891 	if (rule->cmd_len > 0) {
892 		cmd = rule->cmd ;
893 		if (cmd->opcode == O_PROB) {
894 			ipfw_insn_u32 *p = (ipfw_insn_u32 *)cmd;
895 			double d = 1.0 * p->d[0];
896 
897 			d = (d / 0x7fffffff);
898 			printf("prob %f ", d);
899 		}
900 	}
901 
902 	/*
903 	 * first print actions
904 	 */
905         for (l = rule->cmd_len - rule->act_ofs, cmd = ACTION_PTR(rule);
906 			l > 0 ; l -= F_LEN(cmd), cmd += F_LEN(cmd)) {
907 		switch(cmd->opcode) {
908 		case O_CHECK_STATE:
909 			printf("check-state");
910 			flags = HAVE_IP; /* avoid printing anything else */
911 			break;
912 
913 		case O_ACCEPT:
914 			printf("allow");
915 			break;
916 
917 		case O_COUNT:
918 			printf("count");
919 			break;
920 
921 		case O_DEFRAG:
922 			printf("defrag");
923 			break;
924 
925 		case O_DENY:
926 			printf("deny");
927 			break;
928 
929 		case O_REJECT:
930 			if (cmd->arg1 == ICMP_REJECT_RST)
931 				printf("reset");
932 			else if (cmd->arg1 == ICMP_UNREACH_HOST)
933 				printf("reject");
934 			else
935 				print_reject_code(cmd->arg1);
936 			break;
937 
938 		case O_SKIPTO:
939 			printf("skipto %u", cmd->arg1);
940 			break;
941 
942 		case O_PIPE:
943 			printf("pipe %u", cmd->arg1);
944 			break;
945 
946 		case O_QUEUE:
947 			printf("queue %u", cmd->arg1);
948 			break;
949 
950 		case O_DIVERT:
951 			printf("divert %u", cmd->arg1);
952 			break;
953 
954 		case O_TEE:
955 			printf("tee %u", cmd->arg1);
956 			break;
957 
958 		case O_FORWARD_IP:
959 		    {
960 			ipfw_insn_sa *sa = (ipfw_insn_sa *)cmd;
961 
962 			printf("fwd %s", inet_ntoa(sa->sa.sin_addr));
963 			if (sa->sa.sin_port)
964 				printf(",%d", sa->sa.sin_port);
965 		    }
966 			break;
967 
968 		case O_LOG: /* O_LOG is printed last */
969 			logptr = (ipfw_insn_log *)cmd;
970 			break;
971 
972 		default:
973 			printf("** unrecognized action %d len %d",
974 				cmd->opcode, cmd->len);
975 		}
976 	}
977 	if (logptr) {
978 		if (logptr->max_log > 0)
979 			printf(" log logamount %d", logptr->max_log);
980 		else
981 			printf(" log");
982 	}
983 
984 	/*
985 	 * then print the body.
986 	 */
987 	if (rule->usr_flags & IPFW_USR_F_NORULE) {
988 		/* empty rules before options */
989 		if (!do_compact)
990 			printf(" ip from any to any");
991 		flags |= HAVE_IP | HAVE_OPTIONS;
992 	}
993 
994         for (l = rule->act_ofs, cmd = rule->cmd ;
995 			l > 0 ; l -= F_LEN(cmd) , cmd += F_LEN(cmd)) {
996 		/* useful alias */
997 		ipfw_insn_u32 *cmd32 = (ipfw_insn_u32 *)cmd;
998 
999 		show_prerequisites(&flags, 0, cmd->opcode);
1000 
1001 		switch(cmd->opcode) {
1002 		case O_PROB:
1003 			break;	/* done already */
1004 
1005 		case O_PROBE_STATE:
1006 			break; /* no need to print anything here */
1007 
1008 		case O_MACADDR2: {
1009 			ipfw_insn_mac *m = (ipfw_insn_mac *)cmd;
1010 
1011 			if ((cmd->len & F_OR) && !or_block)
1012 				printf(" {");
1013 			if (cmd->len & F_NOT)
1014 				printf(" not");
1015 			printf(" MAC");
1016 			flags |= HAVE_MAC;
1017 			print_mac( m->addr, m->mask);
1018 			print_mac( m->addr + 6, m->mask + 6);
1019 			}
1020 			break;
1021 
1022 		case O_MAC_TYPE:
1023 			if ((cmd->len & F_OR) && !or_block)
1024 				printf(" {");
1025 			print_newports((ipfw_insn_u16 *)cmd, IPPROTO_ETHERTYPE,
1026 				(flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1027 			flags |= HAVE_MAC | HAVE_MACTYPE | HAVE_OPTIONS;
1028 			break;
1029 
1030 		case O_IP_SRC:
1031 		case O_IP_SRC_MASK:
1032 		case O_IP_SRC_ME:
1033 		case O_IP_SRC_SET:
1034 		case O_IP_SRC_TABLE:
1035 		case O_IP_SRC_IFIP:
1036 			show_prerequisites(&flags, HAVE_PROTO, 0);
1037 			if (!(flags & HAVE_SRCIP))
1038 				printf(" from");
1039 			if ((cmd->len & F_OR) && !or_block)
1040 				printf(" {");
1041 			print_ip((ipfw_insn_ip *)cmd,
1042 				(flags & HAVE_OPTIONS) ? " src-ip" : "");
1043 			flags |= HAVE_SRCIP;
1044 			break;
1045 
1046 		case O_IP_DST:
1047 		case O_IP_DST_MASK:
1048 		case O_IP_DST_ME:
1049 		case O_IP_DST_SET:
1050 		case O_IP_DST_TABLE:
1051 		case O_IP_DST_IFIP:
1052 			show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1053 			if (!(flags & HAVE_DSTIP))
1054 				printf(" to");
1055 			if ((cmd->len & F_OR) && !or_block)
1056 				printf(" {");
1057 			print_ip((ipfw_insn_ip *)cmd,
1058 				(flags & HAVE_OPTIONS) ? " dst-ip" : "");
1059 			flags |= HAVE_DSTIP;
1060 			break;
1061 
1062 		case O_IP_DSTPORT:
1063 			show_prerequisites(&flags, HAVE_IP, 0);
1064 			/* FALLTHROUGH */
1065 		case O_IP_SRCPORT:
1066 			show_prerequisites(&flags, HAVE_PROTO|HAVE_SRCIP, 0);
1067 			if ((cmd->len & F_OR) && !or_block)
1068 				printf(" {");
1069 			print_newports((ipfw_insn_u16 *)cmd, proto,
1070 				(flags & HAVE_OPTIONS) ? cmd->opcode : 0);
1071 			break;
1072 
1073 		case O_PROTO: {
1074 			struct protoent *pe;
1075 
1076 			if ((cmd->len & F_OR) && !or_block)
1077 				printf(" {");
1078 			if (cmd->len & F_NOT)
1079 				printf(" not");
1080 			proto = cmd->arg1;
1081 			pe = getprotobynumber(cmd->arg1);
1082 			if (flags & HAVE_OPTIONS)
1083 				printf(" proto");
1084 			if (pe)
1085 				printf(" %s", pe->p_name);
1086 			else
1087 				printf(" %u", cmd->arg1);
1088 			}
1089 			flags |= HAVE_PROTO;
1090 			break;
1091 
1092 		default: /*options ... */
1093 			show_prerequisites(&flags, HAVE_IP | HAVE_OPTIONS, 0);
1094 			if ((cmd->len & F_OR) && !or_block)
1095 				printf(" {");
1096 			if (cmd->len & F_NOT && cmd->opcode != O_IN)
1097 				printf(" not");
1098 			switch(cmd->opcode) {
1099 			case O_FRAG:
1100 				printf(" frag");
1101 				break;
1102 
1103 			case O_IPFRAG:
1104 				printf(" ipfrag");
1105 				break;
1106 
1107 			case O_IN:
1108 				printf(cmd->len & F_NOT ? " out" : " in");
1109 				break;
1110 
1111 			case O_LAYER2:
1112 				printf(" layer2");
1113 				break;
1114 			case O_XMIT:
1115 			case O_RECV:
1116 			case O_VIA: {
1117 				const char *dir;
1118 				ipfw_insn_if *cmdif = (ipfw_insn_if *)cmd;
1119 
1120 				if (cmd->opcode == O_XMIT)
1121 					dir = "xmit";
1122 				else if (cmd->opcode == O_RECV)
1123 					dir = "recv";
1124 				else if (cmd->opcode == O_VIA)
1125 					dir = "via";
1126 				else
1127 					dir = "?huh?";
1128 				if (cmdif->name[0] == '\0')
1129 					printf(" %s %s", dir,
1130 					    inet_ntoa(cmdif->p.ip));
1131 				printf(" %s %s", dir, cmdif->name);
1132 				}
1133 				break;
1134 
1135 			case O_IPID:
1136 				printf(" ipid %u", cmd->arg1 );
1137 				break;
1138 
1139 			case O_IPTTL:
1140 				printf(" ipttl %u", cmd->arg1 );
1141 				break;
1142 
1143 			case O_IPVER:
1144 				printf(" ipver %u", cmd->arg1 );
1145 				break;
1146 
1147 			case O_IPPRECEDENCE:
1148 				printf(" ipprecedence %u", (cmd->arg1) >> 5 );
1149 				break;
1150 
1151 			case O_IPLEN:
1152 				printf(" iplen %u", cmd->arg1 );
1153 				break;
1154 
1155 			case O_IPOPT:
1156 				print_flags("ipoptions", cmd, f_ipopts);
1157 				break;
1158 
1159 			case O_IPTOS:
1160 				print_flags("iptos", cmd, f_iptos);
1161 				break;
1162 
1163 			case O_ICMPCODE:
1164 			case O_ICMPTYPE:
1165 				print_icmp((ipfw_insn_u32 *)cmd);
1166 				break;
1167 
1168 			case O_ESTAB:
1169 				printf(" established");
1170 				break;
1171 
1172 			case O_TCPFLAGS:
1173 				print_flags("tcpflags", cmd, f_tcpflags);
1174 				break;
1175 
1176 			case O_TCPOPTS:
1177 				print_flags("tcpoptions", cmd, f_tcpopts);
1178 				break;
1179 
1180 			case O_TCPWIN:
1181 				printf(" tcpwin %d", ntohs(cmd->arg1));
1182 				break;
1183 
1184 			case O_TCPACK:
1185 				printf(" tcpack %u", ntohl(cmd32->d[0]));
1186 				break;
1187 
1188 			case O_TCPSEQ:
1189 				printf(" tcpseq %u", ntohl(cmd32->d[0]));
1190 				break;
1191 
1192 			case O_UID:
1193 			    {
1194 				struct passwd *pwd = getpwuid(cmd32->d[0]);
1195 
1196 				if (pwd)
1197 					printf(" uid %s", pwd->pw_name);
1198 				else
1199 					printf(" uid %u", cmd32->d[0]);
1200 			    }
1201 				break;
1202 
1203 			case O_GID:
1204 			    {
1205 				struct group *grp = getgrgid(cmd32->d[0]);
1206 
1207 				if (grp)
1208 					printf(" gid %s", grp->gr_name);
1209 				else
1210 					printf(" gid %u", cmd32->d[0]);
1211 			    }
1212 				break;
1213 
1214 			case O_KEEP_STATE:
1215 				printf(" keep-state");
1216 				break;
1217 
1218 			case O_REDIRECT:
1219 			    {
1220 				ipfw_insn_rdr *c = (ipfw_insn_rdr *)cmd;
1221 
1222 				printf(" rdr %s", inet_ntoa(c->addr));
1223 				if (c->port != 0)
1224 					printf(",%u", ntohs(c->port));
1225 				break;
1226 			    }
1227 
1228 			case O_LIMIT:
1229 			    {
1230 				struct _s_x *p = limit_masks;
1231 				ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
1232 				u_int8_t x = c->limit_mask;
1233 				const char *comma = " ";
1234 
1235 				printf(" limit");
1236 				for ( ; p->x != 0 ; p++)
1237 					if ((x & p->x) == p->x) {
1238 						x &= ~p->x;
1239 						printf("%s%s", comma, p->s);
1240 						comma = ",";
1241 					}
1242 				printf(" %d", c->conn_limit);
1243 			    }
1244 				break;
1245 
1246 			default:
1247 				printf(" [opcode %d len %d]",
1248 				    cmd->opcode, cmd->len);
1249 			}
1250 		}
1251 		if (cmd->len & F_OR) {
1252 			printf(" or");
1253 			or_block = 1;
1254 		} else if (or_block) {
1255 			printf(" }");
1256 			or_block = 0;
1257 		}
1258 	}
1259 	show_prerequisites(&flags, HAVE_IP, 0);
1260 
1261 	printf("\n");
1262 }
1263 
1264 static void
show_dyn_ipfw(struct ipfw_ioc_state * d,int pcwidth,int bcwidth)1265 show_dyn_ipfw(struct ipfw_ioc_state *d, int pcwidth, int bcwidth)
1266 {
1267 	struct protoent *pe;
1268 	struct in_addr a;
1269 
1270 	if (!do_expired) {
1271 		if (!d->expire && !(d->dyn_type == O_LIMIT_PARENT))
1272 			return;
1273 	}
1274 
1275 	printf("%05u %*ju %*ju (%ds)", d->rulenum, pcwidth, (uintmax_t)d->pcnt,
1276 	    bcwidth, (uintmax_t)d->bcnt, d->expire);
1277 	switch (d->dyn_type) {
1278 	case O_LIMIT_PARENT:
1279 		printf(" PARENT %d", d->count);
1280 		break;
1281 	case O_LIMIT:
1282 		printf(" LIMIT");
1283 		break;
1284 	case O_KEEP_STATE: /* bidir, no mask */
1285 		printf(" STATE");
1286 		break;
1287 	case O_REDIRECT:
1288 		printf(" REDIRECT");
1289 		break;
1290 	}
1291 
1292 	if ((pe = getprotobynumber(d->id.u.ip.proto)) != NULL)
1293 		printf(" %s", pe->p_name);
1294 	else
1295 		printf(" proto %u", d->id.u.ip.proto);
1296 
1297 	a.s_addr = htonl(d->id.u.ip.src_ip);
1298 	printf(" %s %d", inet_ntoa(a), d->id.u.ip.src_port);
1299 
1300 	a.s_addr = htonl(d->id.u.ip.dst_ip);
1301 	printf(" <-> %s %d", inet_ntoa(a), d->id.u.ip.dst_port);
1302 
1303 	if (d->dyn_type == O_REDIRECT) {
1304 		struct in_addr xlat_addr;
1305 
1306 		xlat_addr.s_addr = htonl(d->xlat_addr);
1307 		printf(" => %s %d", inet_ntoa(xlat_addr), d->xlat_port);
1308 	}
1309 	printf("\n");
1310 }
1311 
1312 static int
sort_q(const void * pa,const void * pb)1313 sort_q(const void *pa, const void *pb)
1314 {
1315 	int rev = (do_sort < 0);
1316 	int field = rev ? -do_sort : do_sort;
1317 	long long res = 0;
1318 	const struct dn_ioc_flowqueue *a = pa;
1319 	const struct dn_ioc_flowqueue *b = pb;
1320 
1321 	switch (field) {
1322 	case 1: /* pkts */
1323 		res = a->len - b->len;
1324 		break;
1325 	case 2: /* bytes */
1326 		res = a->len_bytes - b->len_bytes;
1327 		break;
1328 
1329 	case 3: /* tot pkts */
1330 		res = a->tot_pkts - b->tot_pkts;
1331 		break;
1332 
1333 	case 4: /* tot bytes */
1334 		res = a->tot_bytes - b->tot_bytes;
1335 		break;
1336 	}
1337 	if (res < 0)
1338 		res = -1;
1339 	if (res > 0)
1340 		res = 1;
1341 	return (int)(rev ? res : -res);
1342 }
1343 
1344 static void
list_queues(struct dn_ioc_flowset * fs,struct dn_ioc_flowqueue * q)1345 list_queues(struct dn_ioc_flowset *fs, struct dn_ioc_flowqueue *q)
1346 {
1347 	int l;
1348 
1349 	printf("    mask: 0x%02x 0x%08x/0x%04x -> 0x%08x/0x%04x\n",
1350 	    fs->flow_mask.u.ip.proto,
1351 	    fs->flow_mask.u.ip.src_ip, fs->flow_mask.u.ip.src_port,
1352 	    fs->flow_mask.u.ip.dst_ip, fs->flow_mask.u.ip.dst_port);
1353 	if (fs->rq_elements == 0)
1354 		return;
1355 
1356 	printf("BKT Prot ___Source IP/port____ "
1357 	    "____Dest. IP/port____ Tot_pkt/bytes Pkt/Byte Drp\n");
1358 	if (do_sort != 0)
1359 		heapsort(q, fs->rq_elements, sizeof(*q), sort_q);
1360 	for (l = 0; l < fs->rq_elements; l++) {
1361 		struct in_addr ina;
1362 		struct protoent *pe;
1363 
1364 		ina.s_addr = htonl(q[l].id.u.ip.src_ip);
1365 		printf("%3d ", q[l].hash_slot);
1366 		pe = getprotobynumber(q[l].id.u.ip.proto);
1367 		if (pe)
1368 			printf("%-4s ", pe->p_name);
1369 		else
1370 			printf("%4u ", q[l].id.u.ip.proto);
1371 		printf("%15s/%-5d ",
1372 		    inet_ntoa(ina), q[l].id.u.ip.src_port);
1373 		ina.s_addr = htonl(q[l].id.u.ip.dst_ip);
1374 		printf("%15s/%-5d ",
1375 		    inet_ntoa(ina), q[l].id.u.ip.dst_port);
1376 		printf("%4ju %8ju %2u %4u %3u\n",
1377 		    (uintmax_t)q[l].tot_pkts, (uintmax_t)q[l].tot_bytes,
1378 		    q[l].len, q[l].len_bytes, q[l].drops);
1379 		if (verbose)
1380 			printf("   S %20ju  F %20ju\n",
1381 			    (uintmax_t)q[l].S, (uintmax_t)q[l].F);
1382 	}
1383 }
1384 
1385 static void
print_flowset_parms(struct dn_ioc_flowset * fs,char * prefix)1386 print_flowset_parms(struct dn_ioc_flowset *fs, char *prefix)
1387 {
1388 	int l;
1389 	char qs[30];
1390 	char plr[30];
1391 	char red[90];	/* Display RED parameters */
1392 
1393 	l = fs->qsize;
1394 	if (fs->flags_fs & DN_QSIZE_IS_BYTES) {
1395 		if (l >= 8192)
1396 			sprintf(qs, "%d KB", l / 1024);
1397 		else
1398 			sprintf(qs, "%d B", l);
1399 	} else
1400 		sprintf(qs, "%3d sl.", l);
1401 	if (fs->plr)
1402 		sprintf(plr, "plr %f", 1.0 * fs->plr / (double)(0x7fffffff));
1403 	else
1404 		plr[0] = '\0';
1405 	if (fs->flags_fs & DN_IS_RED)	/* RED parameters */
1406 		sprintf(red,
1407 		    "\n\t  %cRED w_q %f min_th %d max_th %d max_p %f",
1408 		    (fs->flags_fs & DN_IS_GENTLE_RED) ? 'G' : ' ',
1409 		    1.0 * fs->w_q / (double)(1 << SCALE_RED),
1410 		    SCALE_VAL(fs->min_th),
1411 		    SCALE_VAL(fs->max_th),
1412 		    1.0 * fs->max_p / (double)(1 << SCALE_RED));
1413 	else
1414 		sprintf(red, "droptail");
1415 
1416 	printf("%s %s%s %d queues (%d buckets) %s\n",
1417 	    prefix, qs, plr, fs->rq_elements, fs->rq_size, red);
1418 }
1419 
1420 static void
list_pipes(void * data,int nbytes,int ac,char * av[])1421 list_pipes(void *data, int nbytes, int ac, char *av[])
1422 {
1423 	u_long rulenum;
1424 	void *next = data;
1425 	struct dn_ioc_pipe *p = (struct dn_ioc_pipe *)data;
1426 	struct dn_ioc_flowset *fs;
1427 	struct dn_ioc_flowqueue *q;
1428 	int l;
1429 
1430 	if (ac > 0)
1431 		rulenum = strtoul(*av++, NULL, 10);
1432 	else
1433 		rulenum = 0;
1434 	for (; nbytes >= (int)sizeof(*p); p = (struct dn_ioc_pipe *)next) {
1435 		double b = p->bandwidth;
1436 		char buf[30];
1437 		char prefix[80];
1438 
1439 		if (p->fs.fs_type != DN_IS_PIPE)
1440 			break;	/* done with pipes, now queues */
1441 
1442 		/*
1443 		 * compute length, as pipe have variable size
1444 		 */
1445 		l = sizeof(*p) + p->fs.rq_elements * sizeof(*q);
1446 		next = (uint8_t *)p + l;
1447 		nbytes -= l;
1448 
1449 		if (rulenum != 0 && rulenum != (u_long)p->pipe_nr)
1450 			continue;
1451 
1452 		/*
1453 		 * Print rate
1454 		 */
1455 		if (b == 0)
1456 			sprintf(buf, "unlimited");
1457 		else if (b >= 1000000)
1458 			sprintf(buf, "%7.3f Mbit/s", b/1000000);
1459 		else if (b >= 1000)
1460 			sprintf(buf, "%7.3f Kbit/s", b/1000);
1461 		else
1462 			sprintf(buf, "%7.3f bit/s ", b);
1463 
1464 		sprintf(prefix, "%05d: %s %4d ms ",
1465 		    p->pipe_nr, buf, p->delay);
1466 		print_flowset_parms(&p->fs, prefix);
1467 		if (verbose)
1468 			printf("   V %20ju\n", (uintmax_t)p->V >> MY_M);
1469 
1470 		q = (struct dn_ioc_flowqueue *)(p+1);
1471 		list_queues(&p->fs, q);
1472 	}
1473 	for (fs = next; nbytes >= (int)sizeof(*fs); fs = next) {
1474 		char prefix[80];
1475 
1476 		if (fs->fs_type != DN_IS_QUEUE)
1477 			break;
1478 		l = sizeof(*fs) + fs->rq_elements * sizeof(*q);
1479 		next = (uint8_t *)fs + l;
1480 		nbytes -= l;
1481 		q = (struct dn_ioc_flowqueue *)(fs+1);
1482 		sprintf(prefix, "q%05d: weight %d pipe %d ",
1483 		    fs->fs_nr, fs->weight, fs->parent_nr);
1484 		print_flowset_parms(fs, prefix);
1485 		list_queues(fs, q);
1486 	}
1487 }
1488 
1489 /*
1490  * This one handles all set-related commands
1491  * 	ipfw set { show | enable | disable }
1492  * 	ipfw set swap X Y
1493  * 	ipfw set move X to Y
1494  * 	ipfw set move rule X to Y
1495  */
1496 static void
sets_handler(int ac,char * av[])1497 sets_handler(int ac, char *av[])
1498 {
1499 	u_int32_t set_disable, masks[2];
1500 	int i, nbytes;
1501 	u_int16_t rulenum;
1502 	u_int8_t cmd, new_set;
1503 
1504 	ac--;
1505 	av++;
1506 
1507 	if (!ac)
1508 		errx(EX_USAGE, "set needs command");
1509 	if (!strncmp(*av, "show", strlen(*av)) ) {
1510 		void *data;
1511 		const char *msg;
1512 
1513 		nbytes = sizeof(struct ipfw_ioc_rule);
1514 		if ((data = malloc(nbytes)) == NULL)
1515 			err(EX_OSERR, "malloc");
1516 		if (getsockopt(s, IPPROTO_IP, IP_FW_GET, data, &nbytes) < 0)
1517 			err(EX_OSERR, "getsockopt(IP_FW_GET)");
1518 		set_disable = ((struct ipfw_ioc_rule *)data)->set_disable;
1519 
1520 		for (i = 0, msg = "disable" ; i < 31; i++)
1521 			if (  (set_disable & (1<<i))) {
1522 				printf("%s %d", msg, i);
1523 				msg = "";
1524 			}
1525 		msg = (set_disable) ? " enable" : "enable";
1526 		for (i = 0; i < 31; i++)
1527 			if ( !(set_disable & (1<<i))) {
1528 				printf("%s %d", msg, i);
1529 				msg = "";
1530 			}
1531 		printf("\n");
1532 	} else if (!strncmp(*av, "swap", strlen(*av))) {
1533 		ac--; av++;
1534 		if (ac != 2)
1535 			errx(EX_USAGE, "set swap needs 2 set numbers\n");
1536 		rulenum = atoi(av[0]);
1537 		new_set = atoi(av[1]);
1538 		if (!isdigit(*(av[0])) || rulenum > 30)
1539 			errx(EX_DATAERR, "invalid set number %s\n", av[0]);
1540 		if (!isdigit(*(av[1])) || new_set > 30)
1541 			errx(EX_DATAERR, "invalid set number %s\n", av[1]);
1542 		masks[0] = (4 << 24) | (new_set << 16) | (rulenum);
1543 		i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1544 			masks, sizeof(u_int32_t));
1545 	} else if (!strncmp(*av, "move", strlen(*av))) {
1546 		ac--; av++;
1547 		if (ac && !strncmp(*av, "rule", strlen(*av))) {
1548 			cmd = 2;
1549 			ac--; av++;
1550 		} else
1551 			cmd = 3;
1552 		if (ac != 3 || strncmp(av[1], "to", strlen(*av)))
1553 			errx(EX_USAGE, "syntax: set move [rule] X to Y\n");
1554 		rulenum = atoi(av[0]);
1555 		new_set = atoi(av[2]);
1556 		if (!isdigit(*(av[0])) || (cmd == 3 && rulenum > 30) ||
1557 			(cmd == 2 && rulenum == 65535) )
1558 			errx(EX_DATAERR, "invalid source number %s\n", av[0]);
1559 		if (!isdigit(*(av[2])) || new_set > 30)
1560 			errx(EX_DATAERR, "invalid dest. set %s\n", av[1]);
1561 		masks[0] = (cmd << 24) | (new_set << 16) | (rulenum);
1562 		i = setsockopt(s, IPPROTO_IP, IP_FW_DEL,
1563 			masks, sizeof(u_int32_t));
1564 	} else if (!strncmp(*av, "disable", strlen(*av)) ||
1565 		   !strncmp(*av, "enable",  strlen(*av)) ) {
1566 		int which = !strncmp(*av, "enable",  strlen(*av)) ? 1 : 0;
1567 
1568 		ac--; av++;
1569 		masks[0] = masks[1] = 0;
1570 
1571 		while (ac) {
1572 			if (isdigit(**av)) {
1573 				i = atoi(*av);
1574 				if (i < 0 || i > 30)
1575 					errx(EX_DATAERR,
1576 					    "invalid set number %d\n", i);
1577 				masks[which] |= (1<<i);
1578 			} else if (!strncmp(*av, "disable", strlen(*av)))
1579 				which = 0;
1580 			else if (!strncmp(*av, "enable", strlen(*av)))
1581 				which = 1;
1582 			else
1583 				errx(EX_DATAERR,
1584 					"invalid set command %s\n", *av);
1585 			av++; ac--;
1586 		}
1587 		if ( (masks[0] & masks[1]) != 0 )
1588 			errx(EX_DATAERR,
1589 			    "cannot enable and disable the same set\n");
1590 
1591 		i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, masks, sizeof(masks));
1592 		if (i)
1593 			warn("set enable/disable: setsockopt(IP_FW_DEL)");
1594 	} else
1595 		errx(EX_USAGE, "invalid set command %s\n", *av);
1596 }
1597 
1598 static void
sysctl_handler(int ac,char * av[],int which)1599 sysctl_handler(int ac, char *av[], int which)
1600 {
1601 	ac--;
1602 	av++;
1603 
1604 	if (*av == NULL) {
1605 		warnx("missing keyword to enable/disable\n");
1606 	} else if (strncmp(*av, "firewall", strlen(*av)) == 0) {
1607 		sysctlbyname("net.inet.ip.fw.enable", NULL, 0,
1608 		    &which, sizeof(which));
1609 	} else if (strncmp(*av, "one_pass", strlen(*av)) == 0) {
1610 		sysctlbyname("net.inet.ip.fw.one_pass", NULL, 0,
1611 		    &which, sizeof(which));
1612 	} else if (strncmp(*av, "debug", strlen(*av)) == 0) {
1613 		sysctlbyname("net.inet.ip.fw.debug", NULL, 0,
1614 		    &which, sizeof(which));
1615 	} else if (strncmp(*av, "verbose", strlen(*av)) == 0) {
1616 		sysctlbyname("net.inet.ip.fw.verbose", NULL, 0,
1617 		    &which, sizeof(which));
1618 	} else if (strncmp(*av, "dyn_keepalive", strlen(*av)) == 0) {
1619 		sysctlbyname("net.inet.ip.fw.dyn_keepalive", NULL, 0,
1620 		    &which, sizeof(which));
1621 	} else {
1622 		warnx("unrecognize enable/disable keyword: %s\n", *av);
1623 	}
1624 }
1625 
1626 static void
list(int ac,char * av[])1627 list(int ac, char *av[])
1628 {
1629 	struct ipfw_ioc_rule *r;
1630 	struct ipfw_ioc_state *dynrules, *d;
1631 
1632 	void *data = NULL;
1633 	int bcwidth, n, nbytes, nstat, ndyn, pcwidth, width;
1634 	int exitval = EX_OK;
1635 	int lac;
1636 	char **lav;
1637 	u_long rnum;
1638 	char *endptr;
1639 	int seen = 0;
1640 
1641 	const int ocmd = do_pipe ? IP_DUMMYNET_GET : IP_FW_GET;
1642 	int nalloc = 1024;	/* start somewhere... */
1643 
1644 	ac--;
1645 	av++;
1646 
1647 	/* get rules or pipes from kernel, resizing array as necessary */
1648 	nbytes = nalloc;
1649 
1650 	while (nbytes >= nalloc) {
1651 		nalloc = nalloc * 2 + 200;
1652 		nbytes = nalloc;
1653 		if ((data = realloc(data, nbytes)) == NULL)
1654 			err(EX_OSERR, "realloc");
1655 		if (getsockopt(s, IPPROTO_IP, ocmd, data, &nbytes) < 0)
1656 			err(EX_OSERR, "getsockopt(IP_%s_GET)",
1657 				do_pipe ? "DUMMYNET" : "FW");
1658 	}
1659 
1660 	if (do_pipe) {
1661 		list_pipes(data, nbytes, ac, av);
1662 		goto done;
1663 	}
1664 
1665 	/*
1666 	 * Count static rules.
1667 	 */
1668 	r = data;
1669 	nstat = r->static_count;
1670 
1671 	/*
1672 	 * Count dynamic rules. This is easier as they have
1673 	 * fixed size.
1674 	 */
1675 	dynrules = (struct ipfw_ioc_state *)((uint8_t *)r + r->static_len);
1676 	ndyn = (nbytes - r->static_len) / sizeof(*dynrules);
1677 
1678 	/* if showing stats, figure out column widths ahead of time */
1679 	bcwidth = pcwidth = 0;
1680 	if (do_acct) {
1681 		for (n = 0, r = data; n < nstat; n++,
1682 		r = (struct ipfw_ioc_rule *)((uint8_t *)r + IOC_RULESIZE(r))) {
1683 			/* packet counter */
1684 			width = snprintf(NULL, 0, "%ju", (uintmax_t)r->pcnt);
1685 			if (width > pcwidth)
1686 				pcwidth = width;
1687 
1688 			/* byte counter */
1689 			width = snprintf(NULL, 0, "%ju", (uintmax_t)r->bcnt);
1690 			if (width > bcwidth)
1691 				bcwidth = width;
1692 		}
1693 	}
1694 	if (do_dynamic && ndyn) {
1695 		for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1696 			width = snprintf(NULL, 0, "%ju", (uintmax_t)d->pcnt);
1697 			if (width > pcwidth)
1698 				pcwidth = width;
1699 
1700 			width = snprintf(NULL, 0, "%ju", (uintmax_t)d->bcnt);
1701 			if (width > bcwidth)
1702 				bcwidth = width;
1703 		}
1704 	}
1705 	/* if no rule numbers were specified, list all rules */
1706 	if (ac == 0) {
1707 		for (n = 0, r = data; n < nstat; n++,
1708 		r = (struct ipfw_ioc_rule *)((uint8_t *)r + IOC_RULESIZE(r)))
1709 			show_ipfw(r, pcwidth, bcwidth);
1710 
1711 		if (do_dynamic && ndyn) {
1712 			printf("## Dynamic rules (%d):\n", ndyn);
1713 			for (n = 0, d = dynrules; n < ndyn; n++, d++)
1714 				show_dyn_ipfw(d, pcwidth, bcwidth);
1715 		}
1716 		goto done;
1717 	}
1718 
1719 	/* display specific rules requested on command line */
1720 
1721 	for (lac = ac, lav = av; lac != 0; lac--) {
1722 		/* convert command line rule # */
1723 		rnum = strtoul(*lav++, &endptr, 10);
1724 		if (*endptr) {
1725 			exitval = EX_USAGE;
1726 			warnx("invalid rule number: %s", *(lav - 1));
1727 			continue;
1728 		}
1729 		for (n = seen = 0, r = data; n < nstat; n++,
1730 		r = (struct ipfw_ioc_rule *)((uint8_t *)r + IOC_RULESIZE(r))) {
1731 			if (r->rulenum > rnum)
1732 				break;
1733 			if (r->rulenum == rnum) {
1734 				show_ipfw(r, pcwidth, bcwidth);
1735 				seen = 1;
1736 			}
1737 		}
1738 		if (!seen) {
1739 			/* give precedence to other error(s) */
1740 			if (exitval == EX_OK)
1741 				exitval = EX_UNAVAILABLE;
1742 			warnx("rule %lu does not exist", rnum);
1743 		}
1744 	}
1745 
1746 	if (do_dynamic && ndyn) {
1747 		printf("## Dynamic rules:\n");
1748 		for (lac = ac, lav = av; lac != 0; lac--) {
1749 			rnum = strtoul(*lav++, &endptr, 10);
1750 			if (*endptr)
1751 				/* already warned */
1752 				continue;
1753 			for (n = 0, d = dynrules; n < ndyn; n++, d++) {
1754 				if (d->rulenum > rnum)
1755 					break;
1756 				if (d->rulenum == rnum)
1757 					show_dyn_ipfw(d, pcwidth, bcwidth);
1758 			}
1759 		}
1760 	}
1761 
1762 	ac = 0;
1763 
1764 done:
1765 	free(data);
1766 
1767 	if (exitval != EX_OK)
1768 		exit(exitval);
1769 }
1770 
1771 static void
show_usage(void)1772 show_usage(void)
1773 {
1774 	fprintf(stderr, "usage: ipfw [options]\n"
1775 "    add [number] rule\n"
1776 "    pipe number config [pipeconfig]\n"
1777 "    queue number config [queueconfig]\n"
1778 "    [pipe] flush\n"
1779 "    [pipe] delete number ...\n"
1780 "    [pipe] {list|show} [number ...]\n"
1781 "    {zero|resetlog} [number ...]\n"
1782 "do \"ipfw -h\" or see ipfw manpage for details\n"
1783 );
1784 
1785 	exit(EX_USAGE);
1786 }
1787 
1788 static void
help(void)1789 help(void)
1790 {
1791 
1792 	fprintf(stderr, "ipfw syntax summary:\n"
1793 "ipfw add [N] [prob {0..1}] ACTION [log [logamount N]] ADDR OPTIONS\n"
1794 "ipfw {pipe|queue} N config BODY\n"
1795 "ipfw [pipe] {zero|delete|show} [N{,N}]\n"
1796 "\n"
1797 "RULE:		[1..] [PROB] BODY\n"
1798 "RULENUM:	INTEGER(1..65534)\n"
1799 "PROB:		prob REAL(0..1)\n"
1800 "BODY:		check-state [LOG] (no body) |\n"
1801 "		ACTION [LOG] MATCH_ADDR [OPTION_LIST]\n"
1802 "ACTION:	check-state | allow | count | deny | reject | skipto N |\n"
1803 "		{divert|tee} PORT | forward ADDR | pipe N | queue N\n"
1804 "ADDR:		[ MAC dst src ether_type ] \n"
1805 "		[ from IPLIST [ PORT ] to IPLIST [ PORTLIST ] ]\n"
1806 "IPLIST:	IPADDR | ( IPADDR or ... or IPADDR )\n"
1807 "IPADDR:	[not] { any | me | ip | ip/bits | ip:mask | ip/bits{x,y,z} }\n"
1808 "OPTION_LIST:	OPTION [,OPTION_LIST]\n"
1809 );
1810 exit(0);
1811 }
1812 
1813 
1814 static int
lookup_host(char * host,struct in_addr * ipaddr)1815 lookup_host (char *host, struct in_addr *ipaddr)
1816 {
1817 	struct hostent *he;
1818 
1819 	if (!inet_aton(host, ipaddr)) {
1820 		if ((he = gethostbyname(host)) == NULL)
1821 			return(-1);
1822 		*ipaddr = *(struct in_addr *)he->h_addr_list[0];
1823 	}
1824 	return(0);
1825 }
1826 
1827 /*
1828  * fills the addr and mask fields in the instruction as appropriate from av.
1829  * Update length as appropriate.
1830  * The following formats are allowed:
1831  *	any	matches any IP. Actually returns an empty instruction.
1832  *	me	returns O_IP_*_ME
1833  *	<table_id>	O_IP_*_TABLE
1834  *	[iface[:net]]	O_IP_*_IFIP
1835  *	1.2.3.4		single IP address
1836  *	1.2.3.4:5.6.7.8	address:mask
1837  *	1.2.3.4/24	address/mask
1838  *	1.2.3.4/26{1,6,5,4,23}	set of addresses in a subnet
1839  */
1840 static void
fill_ip(ipfw_insn_ip * cmd,char * av)1841 fill_ip(ipfw_insn_ip *cmd, char *av)
1842 {
1843 	char *p = NULL, md = 0;
1844 	u_int32_t i;
1845 
1846 	cmd->o.len &= ~F_LEN_MASK;	/* zero len */
1847 
1848 	if (!strncmp(av, "any", strlen(av)))
1849 		return;
1850 
1851 	if (!strncmp(av, "me", strlen(av))) {
1852 		cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1853 		return;
1854 	}
1855 
1856 	if (strlen(av) >= 3 && av[0] == '<' && av[strlen(av) - 1] == '>') {
1857 		int pos = strlen(av) - 1;
1858 		uint16_t tableid;
1859 		char *eptr;
1860 
1861 		/*
1862 		 * Table: "<tableid>"
1863 		 */
1864 		av[pos] = '\0';
1865 		tableid = strtoul(&av[1], &eptr, 0);
1866 		if (*eptr != '\0') {
1867 			av[pos] = '>';
1868 			errx(EX_DATAERR, "invalid tableid ``%s''", av);
1869 		}
1870 		av[pos] = '>';
1871 		cmd->o.len |= F_INSN_SIZE(ipfw_insn);
1872 		cmd->o.opcode = O_IP_DST_TABLE;
1873 		cmd->o.arg1 = tableid;
1874 		return;
1875 	}
1876 
1877 	if (strlen(av) >= 3 && av[0] == '[' && av[strlen(av) - 1] == ']') {
1878 		int pos = strlen(av) - 1;
1879 		ipfw_insn_ifip *cmd1 = (ipfw_insn_ifip *)cmd;
1880 		char *c;
1881 
1882 		/*
1883 		 * Interface IP: "[ifname[:net]]"
1884 		 */
1885 		cmd1->o.len |= F_INSN_SIZE(ipfw_insn_ifip);
1886 		cmd1->o.opcode = O_IP_DST_IFIP;
1887 		cmd1->o.arg1 = 0;
1888 		cmd1->addr.s_addr = 0;
1889 		cmd1->mask.s_addr = 0;
1890 
1891 		av[pos] = '\0';
1892 		c = strchr(av, ':');
1893 		if (c != NULL) {
1894 			if (strcmp(c + 1, "net") == 0) {
1895 				cmd1->o.arg1 |= IPFW_IFIP_NET;
1896 			} else {
1897 				errx(EX_DATAERR, "invalid ifname modifier: %s",
1898 				    c + 1);
1899 			}
1900 			*c = '\0';
1901 		}
1902 
1903 		strlcpy(cmd1->ifname, &av[1], sizeof(cmd1->ifname));
1904 		if (c != NULL)
1905 			*c = ':';
1906 		av[pos] = ']';
1907 		return;
1908 	}
1909 
1910 	p = strchr(av, '/');
1911 	if (!p)
1912 		p = strchr(av, ':');
1913 	if (p) {
1914 		md = *p;
1915 		*p++ = '\0';
1916 	}
1917 
1918 	if (lookup_host(av, &cmd->addr) != 0)
1919 		errx(EX_NOHOST, "hostname ``%s'' unknown", av);
1920 	switch (md) {
1921 	case ':':
1922 		if (!inet_aton(p, &cmd->mask))
1923 			errx(EX_DATAERR, "bad netmask ``%s''", p);
1924 		break;
1925 	case '/':
1926 		i = atoi(p);
1927 		if (i == 0)
1928 			cmd->mask.s_addr = htonl(0);
1929 		else if (i > 32)
1930 			errx(EX_DATAERR, "bad width ``%s''", p);
1931 		else
1932 			cmd->mask.s_addr = htonl(~0U << (32 - i));
1933 		break;
1934 	default:
1935 		cmd->mask.s_addr = htonl(~0);
1936 		break;
1937 	}
1938 	cmd->addr.s_addr &= cmd->mask.s_addr;
1939 	/*
1940 	 * now look if we have a set of addresses. They are stored as follows:
1941 	 *   arg1	is the set size (powers of 2, 2..256)
1942 	 *   addr	is the base address IN HOST FORMAT
1943 	 *   mask..	is an array of u_int32_t with bits set.
1944 	 */
1945 	if (p)
1946 		p = strchr(p, '{');
1947 	if (p) {	/* fetch addresses */
1948 		u_int32_t *d;
1949 		int low, high;
1950 		int ii = contigmask((u_char *)&(cmd->mask), 32);
1951 
1952 		if (ii < 24 || ii > 31) {
1953 			fprintf(stderr, "invalid set with mask %d\n",
1954 				ii);
1955 			exit(0);
1956 		}
1957 		cmd->o.arg1 = 1<<(32-ii);
1958 		cmd->addr.s_addr = ntohl(cmd->addr.s_addr);
1959 		d = (u_int32_t *)&cmd->mask;
1960 		cmd->o.opcode = O_IP_DST_SET;	/* default */
1961 		cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32) + (cmd->o.arg1+31)/32;
1962 		for (ii = 0; ii < (cmd->o.arg1+31)/32 ; ii++)
1963 			d[ii] = 0;	/* clear masks */
1964 
1965 		av = p+1;
1966 		low = cmd->addr.s_addr & 0xff;
1967 		high = low + cmd->o.arg1 - 1;
1968 		while (isdigit(*av)) {
1969 			char *str;
1970 			u_int16_t a = strtol(av, &str, 0);
1971 
1972 			if (str == av) /* no parameter */
1973 				break;
1974 			if (a < low || a > high) {
1975 			    fprintf(stderr, "addr %d out of range [%d-%d]\n",
1976 				a, low, high);
1977 			    exit(0);
1978 			}
1979 			a -= low;
1980 			d[ a/32] |= 1<<(a & 31);
1981 			if (*str != ',')
1982 				break;
1983 			av = str+1;
1984 		}
1985 		return;
1986 	}
1987 
1988 	if (cmd->mask.s_addr == 0) { /* any */
1989 		if (cmd->o.len & F_NOT)
1990 			errx(EX_DATAERR, "not any never matches");
1991 		else	/* useless, nuke it */
1992 			return;
1993 	} else if (cmd->mask.s_addr ==  IP_MASK_ALL)	/* one IP */
1994 		cmd->o.len |= F_INSN_SIZE(ipfw_insn_u32);
1995 	else						/* addr/mask */
1996 		cmd->o.len |= F_INSN_SIZE(ipfw_insn_ip);
1997 }
1998 
1999 
2000 /*
2001  * helper function to process a set of flags and set bits in the
2002  * appropriate masks.
2003  */
2004 static void
fill_flags(ipfw_insn * cmd,enum ipfw_opcodes opcode,struct _s_x * flags,char * p)2005 fill_flags(ipfw_insn *cmd, enum ipfw_opcodes opcode,
2006 	struct _s_x *flags, char *p)
2007 {
2008 	u_int8_t set=0, clear=0;
2009 
2010 	while (p && *p) {
2011 		char *q;	/* points to the separator */
2012 		int val;
2013 		u_int8_t *which;	/* mask we are working on */
2014 
2015 		if (*p == '!') {
2016 			p++;
2017 			which = &clear;
2018 		} else
2019 			which = &set;
2020 		q = strchr(p, ',');
2021 		if (q)
2022 			*q++ = '\0';
2023 		val = match_token(flags, p);
2024 		if (val <= 0)
2025 			errx(EX_DATAERR, "invalid flag %s", p);
2026 		*which |= (u_int8_t)val;
2027 		p = q;
2028 	}
2029         cmd->opcode = opcode;
2030         cmd->len =  (cmd->len & (F_NOT | F_OR)) | 1;
2031         cmd->arg1 = (set & 0xff) | ( (clear & 0xff) << 8);
2032 }
2033 
2034 
2035 static void
delete(int ac,char * av[])2036 delete(int ac, char *av[])
2037 {
2038 	u_int32_t rulenum;
2039 	struct dn_ioc_pipe pipe;
2040 	int i;
2041 	int exitval = EX_OK;
2042 	int do_set = 0;
2043 
2044 	memset(&pipe, 0, sizeof pipe);
2045 
2046 	av++; ac--;
2047 	if (ac > 0 && !strncmp(*av, "set", strlen(*av))) {
2048 		do_set = 1;	/* delete set */
2049 		ac--; av++;
2050 	}
2051 
2052 	/* Rule number */
2053 	while (ac && isdigit(**av)) {
2054 		i = atoi(*av); av++; ac--;
2055 		if (do_pipe) {
2056 			if (do_pipe == 1)
2057 				pipe.pipe_nr = i;
2058 			else
2059 				pipe.fs.fs_nr = i;
2060 			i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_DEL,
2061 			    &pipe, sizeof pipe);
2062 			if (i) {
2063 				exitval = 1;
2064 				warn("rule %u: setsockopt(IP_DUMMYNET_DEL)",
2065 				    do_pipe == 1 ? pipe.pipe_nr :
2066 				    pipe.fs.fs_nr);
2067 			}
2068 		} else {
2069 			rulenum =  (i & 0xffff) | (do_set << 24);
2070 			i = setsockopt(s, IPPROTO_IP, IP_FW_DEL, &rulenum,
2071 			    sizeof rulenum);
2072 			if (i) {
2073 				exitval = EX_UNAVAILABLE;
2074 				warn("rule %u: setsockopt(IP_FW_DEL)",
2075 				    rulenum);
2076 			}
2077 		}
2078 	}
2079 	if (exitval != EX_OK)
2080 		exit(exitval);
2081 }
2082 
2083 
2084 /*
2085  * fill the interface structure. We do not check the name as we can
2086  * create interfaces dynamically, so checking them at insert time
2087  * makes relatively little sense.
2088  * Interface names containing '*', '?', or '[' are assumed to be shell
2089  * patterns which match interfaces.
2090  */
2091 static void
fill_iface(ipfw_insn_if * cmd,char * arg)2092 fill_iface(ipfw_insn_if *cmd, char *arg)
2093 {
2094 	cmd->name[0] = '\0';
2095 	cmd->o.len |= F_INSN_SIZE(ipfw_insn_if);
2096 
2097 	/* Parse the interface or address */
2098 	if (!strcmp(arg, "any"))
2099 		cmd->o.len = 0;		/* effectively ignore this command */
2100 	else if (!isdigit(*arg)) {
2101 		strlcpy(cmd->name, arg, sizeof(cmd->name));
2102 		cmd->p.glob = strpbrk(arg, "*?[") != NULL ? 1 : 0;
2103 	} else if (!inet_aton(arg, &cmd->p.ip))
2104 		errx(EX_DATAERR, "bad ip address ``%s''", arg);
2105 }
2106 
2107 static unsigned long
getbw(const char * str,u_short * flags,int kb)2108 getbw(const char *str, u_short *flags, int kb)
2109 {
2110     char *end;
2111     unsigned long val;
2112     int inbytes = 0;
2113 
2114     val = strtoul(str, &end, 0);
2115     if (*end == 'k' || *end == 'K') {
2116 	++end;
2117 	val *= kb;
2118     } else if (*end == 'm' || *end == 'M') {
2119 	++end;
2120 	val *= kb * kb;
2121     }
2122 
2123     /*
2124      * Deal with bits or bytes or b(bits) or B(bytes).  If there is no
2125      * trailer assume bits.
2126      */
2127     if (strncasecmp(end, "bit", 3) == 0) {
2128 	;
2129     } else if (strncasecmp(end, "byte", 4) == 0) {
2130 	inbytes = 1;
2131     } else if (*end == 'b') {
2132 	;
2133     } else if (*end == 'B') {
2134 	inbytes = 1;
2135     }
2136 
2137     /*
2138      * Return in bits if flags is NULL, else flag bits
2139      * or bytes in flags and return the unconverted value.
2140      */
2141     if (inbytes && flags)
2142 	*flags |= DN_QSIZE_IS_BYTES;
2143     else if (inbytes && flags == NULL)
2144 	val *= 8;
2145     return(val);
2146 }
2147 
2148 /*
2149  * the following macro returns an error message if we run out of
2150  * arguments.
2151  */
2152 #define	NEED1(msg)	{if (!ac) errx(EX_USAGE, msg);}
2153 
2154 static void
config_pipe(int ac,char ** av)2155 config_pipe(int ac, char **av)
2156 {
2157 	struct dn_ioc_pipe pipe;
2158 	int i;
2159 	char *end;
2160 	u_int32_t a;
2161 
2162 	memset(&pipe, 0, sizeof pipe);
2163 
2164 	av++; ac--;
2165 	/* Pipe number */
2166 	if (ac && isdigit(**av)) {
2167 		i = atoi(*av); av++; ac--;
2168 		if (do_pipe == 1)
2169 			pipe.pipe_nr = i;
2170 		else
2171 			pipe.fs.fs_nr = i;
2172 	}
2173 	while (ac > 0) {
2174 		double d;
2175 		int tok = match_token(dummynet_params, *av);
2176 		ac--; av++;
2177 
2178 		switch(tok) {
2179 		case TOK_NOERROR:
2180 			pipe.fs.flags_fs |= DN_NOERROR;
2181 			break;
2182 
2183 		case TOK_PLR:
2184 			NEED1("plr needs argument 0..1\n");
2185 			d = strtod(av[0], NULL);
2186 			if (d > 1)
2187 				d = 1;
2188 			else if (d < 0)
2189 				d = 0;
2190 			pipe.fs.plr = (int)(d*0x7fffffff);
2191 			ac--; av++;
2192 			break;
2193 
2194 		case TOK_QUEUE:
2195 			NEED1("queue needs queue size\n");
2196 			end = NULL;
2197 			pipe.fs.qsize = getbw(av[0], &pipe.fs.flags_fs, 1024);
2198 			ac--; av++;
2199 			break;
2200 
2201 		case TOK_BUCKETS:
2202 			NEED1("buckets needs argument\n");
2203 			pipe.fs.rq_size = strtoul(av[0], NULL, 0);
2204 			ac--; av++;
2205 			break;
2206 
2207 		case TOK_MASK:
2208 			NEED1("mask needs mask specifier\n");
2209 			/*
2210 			 * per-flow queue, mask is dst_ip, dst_port,
2211 			 * src_ip, src_port, proto measured in bits
2212 			 */
2213 
2214 			pipe.fs.flow_mask.type = ETHERTYPE_IP;
2215 			pipe.fs.flow_mask.u.ip.dst_ip = 0;
2216 			pipe.fs.flow_mask.u.ip.src_ip = 0;
2217 			pipe.fs.flow_mask.u.ip.dst_port = 0;
2218 			pipe.fs.flow_mask.u.ip.src_port = 0;
2219 			pipe.fs.flow_mask.u.ip.proto = 0;
2220 			end = NULL;
2221 
2222 			while (ac >= 1) {
2223 			    u_int32_t *p32 = NULL;
2224 			    u_int16_t *p16 = NULL;
2225 
2226 			    tok = match_token(dummynet_params, *av);
2227 			    ac--; av++;
2228 			    switch(tok) {
2229 			    case TOK_ALL:
2230 				    /*
2231 				     * special case, all bits significant
2232 				     */
2233 				    pipe.fs.flow_mask.u.ip.dst_ip = ~0;
2234 				    pipe.fs.flow_mask.u.ip.src_ip = ~0;
2235 				    pipe.fs.flow_mask.u.ip.dst_port = ~0;
2236 				    pipe.fs.flow_mask.u.ip.src_port = ~0;
2237 				    pipe.fs.flow_mask.u.ip.proto = ~0;
2238 				    pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2239 				    goto end_mask;
2240 
2241 			    case TOK_DSTIP:
2242 				    p32 = &pipe.fs.flow_mask.u.ip.dst_ip;
2243 				    break;
2244 
2245 			    case TOK_SRCIP:
2246 				    p32 = &pipe.fs.flow_mask.u.ip.src_ip;
2247 				    break;
2248 
2249 			    case TOK_DSTPORT:
2250 				    p16 = &pipe.fs.flow_mask.u.ip.dst_port;
2251 				    break;
2252 
2253 			    case TOK_SRCPORT:
2254 				    p16 = &pipe.fs.flow_mask.u.ip.src_port;
2255 				    break;
2256 
2257 			    case TOK_PROTO:
2258 				    break;
2259 
2260 			    default:
2261 				    ac++; av--; /* backtrack */
2262 				    goto end_mask;
2263 			    }
2264 			    if (ac < 1)
2265 				    errx(EX_USAGE, "mask: value missing");
2266 			    if (*av[0] == '/') {
2267 				    a = strtoul(av[0]+1, &end, 0);
2268 				    a = (a == 32) ? ~0 : (1 << a) - 1;
2269 			    } else
2270 				    a = strtoul(av[0], &end, 0);
2271 			    if (p32 != NULL)
2272 				    *p32 = a;
2273 			    else if (p16 != NULL) {
2274 				    if (a > 65535)
2275 					    errx(EX_DATAERR,
2276 						"mask: must be 16 bit");
2277 				    *p16 = (u_int16_t)a;
2278 			    } else {
2279 				    if (a > 255)
2280 					    errx(EX_DATAERR,
2281 						"mask: must be 8 bit");
2282 				    pipe.fs.flow_mask.u.ip.proto = (uint8_t)a;
2283 			    }
2284 			    if (a != 0)
2285 				    pipe.fs.flags_fs |= DN_HAVE_FLOW_MASK;
2286 			    ac--; av++;
2287 			} /* end while, config masks */
2288 end_mask:
2289 			break;
2290 
2291 		case TOK_RED:
2292 		case TOK_GRED:
2293 			NEED1("red/gred needs w_q/min_th/max_th/max_p\n");
2294 			pipe.fs.flags_fs |= DN_IS_RED;
2295 			if (tok == TOK_GRED)
2296 				pipe.fs.flags_fs |= DN_IS_GENTLE_RED;
2297 			/*
2298 			 * the format for parameters is w_q/min_th/max_th/max_p
2299 			 */
2300 			if ((end = strsep(&av[0], "/"))) {
2301 			    double w_q = strtod(end, NULL);
2302 			    if (w_q > 1 || w_q <= 0)
2303 				errx(EX_DATAERR, "0 < w_q <= 1");
2304 			    pipe.fs.w_q = (int) (w_q * (1 << SCALE_RED));
2305 			}
2306 			if ((end = strsep(&av[0], "/"))) {
2307 			    pipe.fs.min_th = strtoul(end, &end, 0);
2308 			    if (*end == 'K' || *end == 'k')
2309 				pipe.fs.min_th *= 1024;
2310 			}
2311 			if ((end = strsep(&av[0], "/"))) {
2312 			    pipe.fs.max_th = strtoul(end, &end, 0);
2313 			    if (*end == 'K' || *end == 'k')
2314 				pipe.fs.max_th *= 1024;
2315 			}
2316 			if ((end = strsep(&av[0], "/"))) {
2317 			    double max_p = strtod(end, NULL);
2318 			    if (max_p > 1 || max_p <= 0)
2319 				errx(EX_DATAERR, "0 < max_p <= 1");
2320 			    pipe.fs.max_p = (int)(max_p * (1 << SCALE_RED));
2321 			}
2322 			ac--; av++;
2323 			break;
2324 
2325 		case TOK_DROPTAIL:
2326 			pipe.fs.flags_fs &= ~(DN_IS_RED|DN_IS_GENTLE_RED);
2327 			break;
2328 
2329 		case TOK_BW:
2330 			NEED1("bw needs bandwidth\n");
2331 			if (do_pipe != 1)
2332 			    errx(EX_DATAERR, "bandwidth only valid for pipes");
2333 			/*
2334 			 * set bandwidth value
2335 			 */
2336 			pipe.bandwidth = getbw(av[0], NULL, 1000);
2337 			if (pipe.bandwidth < 0)
2338 			    errx(EX_DATAERR, "bandwidth too large");
2339 			ac--; av++;
2340 			break;
2341 
2342 		case TOK_DELAY:
2343 			if (do_pipe != 1)
2344 				errx(EX_DATAERR, "delay only valid for pipes");
2345 			NEED1("delay needs argument 0..10000ms\n");
2346 			pipe.delay = strtoul(av[0], NULL, 0);
2347 			ac--; av++;
2348 			break;
2349 
2350 		case TOK_WEIGHT:
2351 			if (do_pipe == 1)
2352 				errx(EX_DATAERR,"weight only valid for queues");
2353 			NEED1("weight needs argument 0..100\n");
2354 			pipe.fs.weight = strtoul(av[0], &end, 0);
2355 			ac--; av++;
2356 			break;
2357 
2358 		case TOK_PIPE:
2359 			if (do_pipe == 1)
2360 				errx(EX_DATAERR,"pipe only valid for queues");
2361 			NEED1("pipe needs pipe_number\n");
2362 			pipe.fs.parent_nr = strtoul(av[0], &end, 0);
2363 			ac--; av++;
2364 			break;
2365 
2366 		default:
2367 			errx(EX_DATAERR, "unrecognised option ``%s''", *av);
2368 		}
2369 	}
2370 	if (do_pipe == 1) {
2371 		if (pipe.pipe_nr == 0)
2372 			errx(EX_DATAERR, "pipe_nr must be > 0");
2373 		if (pipe.delay > 10000)
2374 			errx(EX_DATAERR, "delay must be < 10000");
2375 	} else { /* do_pipe == 2, queue */
2376 		if (pipe.fs.parent_nr == 0)
2377 			errx(EX_DATAERR, "pipe must be > 0");
2378 		if (pipe.fs.weight >100)
2379 			errx(EX_DATAERR, "weight must be <= 100");
2380 	}
2381 	if (pipe.fs.flags_fs & DN_QSIZE_IS_BYTES) {
2382 		if (pipe.fs.qsize > 1024*1024)
2383 			errx(EX_DATAERR, "queue size must be < 1MB");
2384 	} else {
2385 		if (pipe.fs.qsize > 100)
2386 			errx(EX_DATAERR, "2 <= queue size <= 100");
2387 	}
2388 	if (pipe.fs.flags_fs & DN_IS_RED) {
2389 		size_t len;
2390 		int lookup_depth, avg_pkt_size;
2391 		double step, idle, weight, w_q;
2392 		int clock_hz;
2393 		int t;
2394 
2395 		if (pipe.fs.min_th >= pipe.fs.max_th)
2396 		    errx(EX_DATAERR, "min_th %d must be < than max_th %d",
2397 			pipe.fs.min_th, pipe.fs.max_th);
2398 		if (pipe.fs.max_th == 0)
2399 		    errx(EX_DATAERR, "max_th must be > 0");
2400 
2401 		len = sizeof(int);
2402 		if (sysctlbyname("net.inet.ip.dummynet.red_lookup_depth",
2403 			&lookup_depth, &len, NULL, 0) == -1)
2404 
2405 		    errx(1, "sysctlbyname(\"%s\")",
2406 			"net.inet.ip.dummynet.red_lookup_depth");
2407 		if (lookup_depth == 0)
2408 		    errx(EX_DATAERR, "net.inet.ip.dummynet.red_lookup_depth"
2409 			" must be greater than zero");
2410 
2411 		len = sizeof(int);
2412 		if (sysctlbyname("net.inet.ip.dummynet.red_avg_pkt_size",
2413 			&avg_pkt_size, &len, NULL, 0) == -1)
2414 
2415 		    errx(1, "sysctlbyname(\"%s\")",
2416 			"net.inet.ip.dummynet.red_avg_pkt_size");
2417 		if (avg_pkt_size == 0)
2418 			errx(EX_DATAERR,
2419 			    "net.inet.ip.dummynet.red_avg_pkt_size must"
2420 			    " be greater than zero");
2421 
2422 		len = sizeof(clock_hz);
2423 		if (sysctlbyname("net.inet.ip.dummynet.hz", &clock_hz, &len,
2424 				 NULL, 0) == -1) {
2425 			errx(1, "sysctlbyname(\"%s\")",
2426 			     "net.inet.ip.dummynet.hz");
2427 		}
2428 
2429 		/*
2430 		 * Ticks needed for sending a medium-sized packet.
2431 		 * Unfortunately, when we are configuring a WF2Q+ queue, we
2432 		 * do not have bandwidth information, because that is stored
2433 		 * in the parent pipe, and also we have multiple queues
2434 		 * competing for it. So we set step=0, which is not very
2435 		 * correct. But on the other hand, why do we want RED with
2436 		 * WF2Q+ ?
2437 		 */
2438 		if (pipe.bandwidth==0) /* this is a WF2Q+ queue */
2439 			step = 0;
2440 		else
2441 			step = clock_hz * avg_pkt_size * 8 / pipe.bandwidth;
2442 
2443 		/*
2444 		 * max idle time (in ticks) before avg queue size becomes 0.
2445 		 * NOTA:  (3/w_q) is approx the value x so that
2446 		 * (1-w_q)^x < 10^-3.
2447 		 */
2448 		w_q = ((double)pipe.fs.w_q) / (1 << SCALE_RED);
2449 		idle = step * 3. / w_q;
2450 		pipe.fs.lookup_step = (int)idle / lookup_depth;
2451 		if (!pipe.fs.lookup_step)
2452 			pipe.fs.lookup_step = 1;
2453 		weight = 1 - w_q;
2454 		for (t = pipe.fs.lookup_step; t > 0; --t)
2455 			weight *= weight;
2456 		pipe.fs.lookup_weight = (int)(weight * (1 << SCALE_RED));
2457 	}
2458 	i = setsockopt(s, IPPROTO_IP, IP_DUMMYNET_CONFIGURE, &pipe,
2459 			    sizeof pipe);
2460 	if (i)
2461 		err(1, "setsockopt(%s)", "IP_DUMMYNET_CONFIGURE");
2462 }
2463 
2464 static void
get_mac_addr_mask(char * p,u_char * addr,u_char * mask)2465 get_mac_addr_mask(char *p, u_char *addr, u_char *mask)
2466 {
2467 	int i, l;
2468 
2469 	for (i=0; i<6; i++)
2470 		addr[i] = mask[i] = 0;
2471 	if (!strcmp(p, "any"))
2472 		return;
2473 
2474 	for (i=0; *p && i<6;i++, p++) {
2475 		addr[i] = strtol(p, &p, 16);
2476 		if (*p != ':') /* we start with the mask */
2477 			break;
2478 	}
2479 	if (*p == '/') { /* mask len */
2480 		l = strtol(p+1, &p, 0);
2481 		for (i=0; l>0; l -=8, i++)
2482 			mask[i] = (l >=8) ? 0xff : (~0U) << (8-l);
2483 	} else if (*p == '&') { /* mask */
2484 		for (i=0, p++; *p && i<6;i++, p++) {
2485 			mask[i] = strtol(p, &p, 16);
2486 			if (*p != ':')
2487 				break;
2488 		}
2489 	} else if (*p == '\0') {
2490 		for (i=0; i<6; i++)
2491 			mask[i] = 0xff;
2492 	}
2493 	for (i=0; i<6; i++)
2494 		addr[i] &= mask[i];
2495 }
2496 
2497 /*
2498  * helper function, updates the pointer to cmd with the length
2499  * of the current command, and also cleans up the first word of
2500  * the new command in case it has been clobbered before.
2501  */
2502 static ipfw_insn *
next_cmd(ipfw_insn * cmd)2503 next_cmd(ipfw_insn *cmd)
2504 {
2505 	cmd += F_LEN(cmd);
2506 	bzero(cmd, sizeof(*cmd));
2507 	return cmd;
2508 }
2509 
2510 /*
2511  * A function to fill simple commands of size 1.
2512  * Existing flags are preserved.
2513  */
2514 static void
fill_cmd(ipfw_insn * cmd,enum ipfw_opcodes opcode,int flags,u_int16_t arg)2515 fill_cmd(ipfw_insn *cmd, enum ipfw_opcodes opcode, int flags, u_int16_t arg)
2516 {
2517 	cmd->opcode = opcode;
2518 	cmd->len =  ((cmd->len | flags) & (F_NOT | F_OR)) | 1;
2519 	cmd->arg1 = arg;
2520 }
2521 
2522 /*
2523  * Fetch and add the MAC address and type, with masks. This generates one or
2524  * two microinstructions, and returns the pointer to the last one.
2525  */
2526 static ipfw_insn *
add_mac(ipfw_insn * cmd,int ac,char * av[])2527 add_mac(ipfw_insn *cmd, int ac, char *av[])
2528 {
2529 	ipfw_insn_mac *mac;
2530 
2531 	if (ac < 2)
2532 		errx(EX_DATAERR, "MAC dst src");
2533 
2534 	cmd->opcode = O_MACADDR2;
2535 	cmd->len = (cmd->len & (F_NOT | F_OR)) | F_INSN_SIZE(ipfw_insn_mac);
2536 
2537 	mac = (ipfw_insn_mac *)cmd;
2538 	get_mac_addr_mask(av[0], mac->addr, mac->mask);	/* dst */
2539 	get_mac_addr_mask(av[1], &(mac->addr[6]), &(mac->mask[6])); /* src */
2540 	return cmd;
2541 }
2542 
2543 static ipfw_insn *
add_mactype(ipfw_insn * cmd,int ac,char * av)2544 add_mactype(ipfw_insn *cmd, int ac, char *av)
2545 {
2546 	if (ac < 1)
2547 		errx(EX_DATAERR, "missing MAC type");
2548 	if (strcmp(av, "any") != 0) { /* we have a non-null type */
2549 		fill_newports((ipfw_insn_u16 *)cmd, av, IPPROTO_ETHERTYPE);
2550 		cmd->opcode = O_MAC_TYPE;
2551 		return cmd;
2552 	} else
2553 		return NULL;
2554 }
2555 
2556 static ipfw_insn *
add_proto(ipfw_insn * cmd,char * av)2557 add_proto(ipfw_insn *cmd, char *av)
2558 {
2559 	struct protoent *pe;
2560 	u_char proto = 0;
2561 
2562 	if (!strncmp(av, "all", strlen(av)))
2563 		; /* same as "ip" */
2564 	else if ((proto = atoi(av)) > 0)
2565 		; /* all done! */
2566 	else if ((pe = getprotobyname(av)) != NULL)
2567 		proto = pe->p_proto;
2568 	else
2569 		return NULL;
2570 	if (proto != IPPROTO_IP)
2571 		fill_cmd(cmd, O_PROTO, 0, proto);
2572 	return cmd;
2573 }
2574 
2575 static ipfw_insn *
add_srcip(ipfw_insn * cmd,char * av)2576 add_srcip(ipfw_insn *cmd, char *av)
2577 {
2578 	fill_ip((ipfw_insn_ip *)cmd, av);
2579 	if (cmd->opcode == O_IP_DST_SET)			/* set */
2580 		cmd->opcode = O_IP_SRC_SET;
2581 	else if (cmd->opcode == O_IP_DST_TABLE)			/* table */
2582 		cmd->opcode = O_IP_SRC_TABLE;
2583 	else if (cmd->opcode == O_IP_DST_IFIP)			/* iface's IP */
2584 		cmd->opcode = O_IP_SRC_IFIP;
2585 	else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))		/* me */
2586 		cmd->opcode = O_IP_SRC_ME;
2587 	else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))	/* one IP */
2588 		cmd->opcode = O_IP_SRC;
2589 	else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))	/* addr/mask */
2590 		cmd->opcode = O_IP_SRC_MASK;
2591 	return cmd;
2592 }
2593 
2594 static ipfw_insn *
add_dstip(ipfw_insn * cmd,char * av)2595 add_dstip(ipfw_insn *cmd, char *av)
2596 {
2597 	fill_ip((ipfw_insn_ip *)cmd, av);
2598 	if (cmd->opcode == O_IP_DST_SET)			/* set */
2599 		;
2600 	else if (cmd->opcode == O_IP_DST_TABLE)			/* table */
2601 		;
2602 	else if (cmd->opcode == O_IP_DST_IFIP)			/* iface's IP */
2603 		;
2604 	else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn))		/* me */
2605 		cmd->opcode = O_IP_DST_ME;
2606 	else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_u32))	/* one IP */
2607 		cmd->opcode = O_IP_DST;
2608 	else if (F_LEN(cmd) == F_INSN_SIZE(ipfw_insn_ip))	/* addr/mask */
2609 		cmd->opcode = O_IP_DST_MASK;
2610 	return cmd;
2611 }
2612 
2613 static ipfw_insn *
add_ports(ipfw_insn * cmd,char * av,u_char proto,int opcode)2614 add_ports(ipfw_insn *cmd, char *av, u_char proto, int opcode)
2615 {
2616 	if (!strncmp(av, "any", strlen(av))) {
2617 		return NULL;
2618 	} else if (fill_newports((ipfw_insn_u16 *)cmd, av, proto)) {
2619 		/* XXX todo: check that we have a protocol with ports */
2620 		cmd->opcode = opcode;
2621 		return cmd;
2622 	}
2623 	return NULL;
2624 }
2625 
2626 static void
fill_rdr(ipfw_insn * cmd,char * av)2627 fill_rdr(ipfw_insn *cmd, char *av)
2628 {
2629 	ipfw_insn_rdr *c = (ipfw_insn_rdr *)cmd;
2630 	char *p;
2631 
2632 	cmd->opcode = O_REDIRECT;
2633 	cmd->len = F_INSN_SIZE(ipfw_insn_rdr);
2634 	cmd->arg1 = 0;
2635 	c->addr.s_addr = INADDR_ANY;
2636 	c->port = 0;
2637 	c->set = UINT16_MAX;
2638 
2639 	p = strchr(av, ',');
2640 	if (p == NULL)
2641 		p = strchr(av, ':');
2642 	if (p != NULL)
2643 		*p = '\0';
2644 	lookup_host(av, &c->addr);
2645 
2646 	if (p != NULL && *(p + 1) != '\0') {
2647 		char *ep;
2648 
2649 		c->port = strtoul(p + 1, &ep, 0);
2650 		if (*ep != '\0')
2651 			errx(EX_DATAERR, "illegal port %s", p + 1);
2652 		c->port = htons(c->port);
2653 	}
2654 }
2655 
2656 /*
2657  * Parse arguments and assemble the microinstructions which make up a rule.
2658  * Rules are added into the 'rulebuf' and then copied in the correct order
2659  * into the actual rule.
2660  *
2661  * The syntax for a rule starts with the action, followed by an
2662  * optional log action, and the various match patterns.
2663  * In the assembled microcode, the first opcode must be a O_PROBE_STATE
2664  * (generated if the rule includes a keep-state option), then the
2665  * various match patterns, the "log" action, and the actual action.
2666  *
2667  */
2668 static void
add(int ac,char * av[])2669 add(int ac, char *av[])
2670 {
2671 	/*
2672 	 * rules are added into the 'rulebuf' and then copied in
2673 	 * the correct order into the actual rule.
2674 	 * Some things that need to go out of order (prob, action etc.)
2675 	 * go into actbuf[].
2676 	 */
2677 	static uint32_t rulebuf[IPFW_RULE_SIZE_MAX];
2678 	static uint32_t actbuf[IPFW_RULE_SIZE_MAX];
2679 	static uint32_t cmdbuf[IPFW_RULE_SIZE_MAX];
2680 
2681 	ipfw_insn *src, *dst, *cmd, *action, *prev = NULL;
2682 	ipfw_insn *first_cmd;	/* first match pattern */
2683 
2684 	struct ipfw_ioc_rule *rule;
2685 
2686 	/*
2687 	 * various flags used to record that we entered some fields.
2688 	 */
2689 	ipfw_insn *have_state = NULL;	/* check-state or keep-state */
2690 
2691 	int i;
2692 
2693 	int open_par = 0;	/* open parenthesis ( */
2694 
2695 	int has_dstport = 0;
2696 	int has_recv = 0;
2697 
2698 	/* proto is here because it is used to fetch ports */
2699 	u_char proto = IPPROTO_IP;	/* default protocol */
2700 
2701 	double match_prob = 1; /* match probability, default is always match */
2702 
2703 	bzero(actbuf, sizeof(actbuf));		/* actions go here */
2704 	bzero(cmdbuf, sizeof(cmdbuf));
2705 	bzero(rulebuf, sizeof(rulebuf));
2706 
2707 	rule = (struct ipfw_ioc_rule *)rulebuf;
2708 	cmd = (ipfw_insn *)cmdbuf;
2709 	action = (ipfw_insn *)actbuf;
2710 
2711 	av++; ac--;
2712 
2713 	/* [rule N]	-- Rule number optional */
2714 	if (ac && isdigit(**av)) {
2715 		rule->rulenum = atoi(*av);
2716 		av++;
2717 		ac--;
2718 	}
2719 
2720 	/* [set N]	-- set number (0..30), optional */
2721 	if (ac > 1 && !strncmp(*av, "set", strlen(*av))) {
2722 		int set = strtoul(av[1], NULL, 10);
2723 		if (set < 0 || set > 30)
2724 			errx(EX_DATAERR, "illegal set %s", av[1]);
2725 		rule->set = set;
2726 		av += 2; ac -= 2;
2727 	}
2728 
2729 	/* [prob D]	-- match probability, optional */
2730 	if (ac > 1 && !strncmp(*av, "prob", strlen(*av))) {
2731 		match_prob = strtod(av[1], NULL);
2732 
2733 		if (match_prob <= 0 || match_prob > 1)
2734 			errx(EX_DATAERR, "illegal match prob. %s", av[1]);
2735 		av += 2; ac -= 2;
2736 	}
2737 
2738 	/* action	-- mandatory */
2739 	NEED1("missing action");
2740 	i = match_token(rule_actions, *av);
2741 	ac--; av++;
2742 	action->len = 1;	/* default */
2743 	switch(i) {
2744 	case TOK_CHECKSTATE:
2745 		have_state = action;
2746 		action->opcode = O_CHECK_STATE;
2747 		break;
2748 
2749 	case TOK_ACCEPT:
2750 		action->opcode = O_ACCEPT;
2751 		break;
2752 
2753 	case TOK_DEFRAG:
2754 		action->opcode = O_DEFRAG;
2755 		action->arg1 = 0;
2756 		break;
2757 
2758 	case TOK_DENY:
2759 		action->opcode = O_DENY;
2760 		action->arg1 = 0;
2761 		break;
2762 
2763 	case TOK_REJECT:
2764 		action->opcode = O_REJECT;
2765 		action->arg1 = ICMP_UNREACH_HOST;
2766 		break;
2767 
2768 	case TOK_RESET:
2769 		action->opcode = O_REJECT;
2770 		action->arg1 = ICMP_REJECT_RST;
2771 		break;
2772 
2773 	case TOK_UNREACH:
2774 		action->opcode = O_REJECT;
2775 		NEED1("missing reject code");
2776 		fill_reject_code(&action->arg1, *av);
2777 		ac--; av++;
2778 		break;
2779 
2780 	case TOK_COUNT:
2781 		action->opcode = O_COUNT;
2782 		break;
2783 
2784 	case TOK_QUEUE:
2785 	case TOK_PIPE:
2786 		action->len = F_INSN_SIZE(ipfw_insn_pipe);
2787 		/* FALLTHROUGH */
2788 	case TOK_SKIPTO:
2789 		if (i == TOK_QUEUE)
2790 			action->opcode = O_QUEUE;
2791 		else if (i == TOK_PIPE)
2792 			action->opcode = O_PIPE;
2793 		else if (i == TOK_SKIPTO)
2794 			action->opcode = O_SKIPTO;
2795 		NEED1("missing skipto/pipe/queue number");
2796 		action->arg1 = strtoul(*av, NULL, 10);
2797 		av++; ac--;
2798 		break;
2799 
2800 	case TOK_DIVERT:
2801 	case TOK_TEE:
2802 		action->opcode = (i == TOK_DIVERT) ? O_DIVERT : O_TEE;
2803 		NEED1("missing divert/tee port");
2804 		action->arg1 = strtoul(*av, NULL, 0);
2805 		if (action->arg1 == 0) {
2806 			struct servent *serv;
2807 			setservent(1);
2808 			serv = getservbyname(av[0], "divert");
2809 			if (serv != NULL)
2810 				action->arg1 = ntohs(serv->s_port);
2811 			else
2812 				errx(EX_DATAERR, "illegal divert/tee port");
2813 		}
2814 		ac--; av++;
2815 		break;
2816 
2817 	case TOK_FORWARD: {
2818 		ipfw_insn_sa *p = (ipfw_insn_sa *)action;
2819 		char *st, *end;
2820 
2821 		NEED1("missing forward address[:port]");
2822 
2823 		action->opcode = O_FORWARD_IP;
2824 		action->len = F_INSN_SIZE(ipfw_insn_sa);
2825 
2826 		p->sa.sin_len = sizeof(struct sockaddr_in);
2827 		p->sa.sin_family = AF_INET;
2828 		p->sa.sin_port = 0;
2829 		/*
2830 		 * locate the address-port separator (':' or ',')
2831 		 */
2832 		st = strchr(*av, ':');
2833 		if (st == NULL)
2834 			st = strchr(*av, ',');
2835 		if (st != NULL) {
2836 			*(st++) = '\0';
2837 			i = strtoport(st, &end, 0 /* base */, 0 /* proto */);
2838 			if (st == end)
2839 				errx(EX_DATAERR,
2840 				    "illegal forwarding port ``%s''", st);
2841 			p->sa.sin_port = (u_short)i;
2842 		}
2843 		lookup_host(*av, &(p->sa.sin_addr));
2844 		}
2845 		ac--; av++;
2846 		break;
2847 
2848 	default:
2849 		errx(EX_DATAERR, "invalid action %s\n", av[-1]);
2850 	}
2851 	action = next_cmd(action);
2852 
2853 	/*
2854 	 * [log [logamount N]]	-- log, optional
2855 	 *
2856 	 * If exists, it goes first in the cmdbuf, but then it is
2857 	 * skipped in the copy section to the end of the buffer.
2858 	 */
2859 	if (ac && !strncmp(*av, "log", strlen(*av))) {
2860 		ipfw_insn_log *c = (ipfw_insn_log *)cmd;
2861 
2862 		cmd->len = F_INSN_SIZE(ipfw_insn_log);
2863 		cmd->opcode = O_LOG;
2864 		av++; ac--;
2865 		if (ac && !strncmp(*av, "logamount", strlen(*av))) {
2866 			ac--; av++;
2867 			NEED1("logamount requires argument");
2868 			c->max_log = atoi(*av);
2869 			ac--; av++;
2870 		}
2871 		cmd = next_cmd(cmd);
2872 	}
2873 
2874 	if (have_state)	/* must be a check-state, we are done */
2875 		goto done;
2876 
2877 #define OR_START(target)					\
2878 	if (ac && (*av[0] == '(' || *av[0] == '{')) {		\
2879 		if (open_par)					\
2880 			errx(EX_USAGE, "nested \"(\" not allowed\n"); \
2881 		prev = NULL;					\
2882 		open_par = 1;					\
2883 		if ( (av[0])[1] == '\0') {			\
2884 			ac--; av++;				\
2885 		} else						\
2886 			(*av)++;				\
2887 	}							\
2888 	target:							\
2889 
2890 
2891 #define	CLOSE_PAR						\
2892 	if (open_par) {						\
2893 		if (ac && (					\
2894 		    !strncmp(*av, ")", strlen(*av)) ||		\
2895 		    !strncmp(*av, "}", strlen(*av)) )) {	\
2896 			prev = NULL;				\
2897 			open_par = 0;				\
2898 			ac--; av++;				\
2899 		} else						\
2900 			errx(EX_USAGE, "missing \")\"\n");	\
2901 	}
2902 
2903 #define NOT_BLOCK						\
2904 	if (ac && !strncmp(*av, "not", strlen(*av))) {		\
2905 		if (cmd->len & F_NOT)				\
2906 			errx(EX_USAGE, "double \"not\" not allowed\n"); \
2907 		cmd->len |= F_NOT;				\
2908 		ac--; av++;					\
2909 	}
2910 
2911 #define OR_BLOCK(target)					\
2912 	if (ac && !strncmp(*av, "or", strlen(*av))) {		\
2913 		if (prev == NULL || open_par == 0)		\
2914 			errx(EX_DATAERR, "invalid OR block");	\
2915 		prev->len |= F_OR;				\
2916 		ac--; av++;					\
2917 		goto target;					\
2918 	}							\
2919 	CLOSE_PAR;
2920 
2921 	first_cmd = cmd;
2922 
2923 #if 0
2924 	/*
2925 	 * MAC addresses, optional.
2926 	 * If we have this, we skip the part "proto from src to dst"
2927 	 * and jump straight to the option parsing.
2928 	 */
2929 	NOT_BLOCK;
2930 	NEED1("missing protocol");
2931 	if (!strncmp(*av, "MAC", strlen(*av)) ||
2932 	    !strncmp(*av, "mac", strlen(*av))) {
2933 		ac--; av++;	/* the "MAC" keyword */
2934 		add_mac(cmd, ac, av); /* exits in case of errors */
2935 		cmd = next_cmd(cmd);
2936 		ac -= 2; av += 2;	/* dst-mac and src-mac */
2937 		NOT_BLOCK;
2938 		NEED1("missing mac type");
2939 		if (add_mactype(cmd, ac, av[0]))
2940 			cmd = next_cmd(cmd);
2941 		ac--; av++;	/* any or mac-type */
2942 		goto read_options;
2943 	}
2944 #endif
2945 
2946 	/*
2947 	 * protocol, mandatory
2948 	 */
2949     OR_START(get_proto);
2950 	NOT_BLOCK;
2951 	NEED1("missing protocol");
2952 	if (add_proto(cmd, *av)) {
2953 		av++; ac--;
2954 		if (F_LEN(cmd) == 0)	/* plain IP */
2955 			proto = 0;
2956 		else {
2957 			proto = cmd->arg1;
2958 			prev = cmd;
2959 			cmd = next_cmd(cmd);
2960 		}
2961 	} else if (first_cmd != cmd) {
2962 		errx(EX_DATAERR, "invalid protocol ``%s''", *av);
2963 	} else
2964 		goto read_options;
2965     OR_BLOCK(get_proto);
2966 
2967 	/*
2968 	 * "from", mandatory
2969 	 */
2970 	if (!ac || strncmp(*av, "from", strlen(*av)))
2971 		errx(EX_USAGE, "missing ``from''");
2972 	ac--; av++;
2973 
2974 	/*
2975 	 * source IP, mandatory
2976 	 */
2977     OR_START(source_ip);
2978 	NOT_BLOCK;	/* optional "not" */
2979 	NEED1("missing source address");
2980 	if (add_srcip(cmd, *av)) {
2981 		ac--; av++;
2982 		if (F_LEN(cmd) != 0) {	/* ! any */
2983 			prev = cmd;
2984 			cmd = next_cmd(cmd);
2985 		}
2986 	}
2987     OR_BLOCK(source_ip);
2988 
2989 	/*
2990 	 * source ports, optional
2991 	 */
2992 	NOT_BLOCK;	/* optional "not" */
2993 	if (ac) {
2994 		if (!strncmp(*av, "any", strlen(*av)) ||
2995 		    add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
2996 			ac--; av++;
2997 			if (F_LEN(cmd) != 0)
2998 				cmd = next_cmd(cmd);
2999 		}
3000 	}
3001 
3002 	/*
3003 	 * "to", mandatory
3004 	 */
3005 	if (!ac || strncmp(*av, "to", strlen(*av)))
3006 		errx(EX_USAGE, "missing ``to''");
3007 	av++; ac--;
3008 
3009 	/*
3010 	 * destination, mandatory
3011 	 */
3012     OR_START(dest_ip);
3013 	NOT_BLOCK;	/* optional "not" */
3014 	NEED1("missing dst address");
3015 	if (add_dstip(cmd, *av)) {
3016 		ac--; av++;
3017 		if (F_LEN(cmd) != 0) {	/* ! any */
3018 			prev = cmd;
3019 			cmd = next_cmd(cmd);
3020 		}
3021 	}
3022     OR_BLOCK(dest_ip);
3023 
3024 	/*
3025 	 * dest. ports, optional
3026 	 */
3027 	NOT_BLOCK;	/* optional "not" */
3028 	if (ac) {
3029 		if (!strncmp(*av, "any", strlen(*av)) ||
3030 		    add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3031 			ac--; av++;
3032 			if (F_LEN(cmd) != 0) {
3033 				has_dstport = 1;
3034 				cmd = next_cmd(cmd);
3035 			}
3036 		}
3037 	}
3038 
3039 read_options:
3040 	if (ac && first_cmd == cmd) {
3041 		/*
3042 		 * nothing specified so far, store in the rule to ease
3043 		 * printout later.
3044 		 */
3045 		 rule->usr_flags = IPFW_USR_F_NORULE;
3046 	}
3047 	prev = NULL;
3048 	while (ac) {
3049 		char *s1;
3050 		ipfw_insn_u32 *cmd32;	/* alias for cmd */
3051 
3052 		s1 = *av;
3053 		cmd32 = (ipfw_insn_u32 *)cmd;
3054 
3055 		if (*s1 == '!') {	/* alternate syntax for NOT */
3056 			if (cmd->len & F_NOT)
3057 				errx(EX_USAGE, "double \"not\" not allowed\n");
3058 			cmd->len = F_NOT;
3059 			s1++;
3060 		}
3061 		i = match_token(rule_options, s1);
3062 		ac--; av++;
3063 		switch(i) {
3064 		case TOK_NOT:
3065 			if (cmd->len & F_NOT)
3066 				errx(EX_USAGE, "double \"not\" not allowed\n");
3067 			cmd->len = F_NOT;
3068 			break;
3069 
3070 		case TOK_OR:
3071 			if (open_par == 0 || prev == NULL)
3072 				errx(EX_USAGE, "invalid \"or\" block\n");
3073 			prev->len |= F_OR;
3074 			break;
3075 
3076 		case TOK_STARTBRACE:
3077 			if (open_par)
3078 				errx(EX_USAGE, "+nested \"(\" not allowed\n");
3079 			open_par = 1;
3080 			break;
3081 
3082 		case TOK_ENDBRACE:
3083 			if (!open_par)
3084 				errx(EX_USAGE, "+missing \")\"\n");
3085 			open_par = 0;
3086 			prev = NULL;
3087         		break;
3088 
3089 		case TOK_IN:
3090 			fill_cmd(cmd, O_IN, 0, 0);
3091 			break;
3092 
3093 		case TOK_OUT:
3094 			cmd->len ^= F_NOT; /* toggle F_NOT */
3095 			fill_cmd(cmd, O_IN, 0, 0);
3096 			break;
3097 
3098 		case TOK_FRAG:
3099 			fill_cmd(cmd, O_FRAG, 0, 0);
3100 			break;
3101 
3102 		case TOK_IPFRAG:
3103 			fill_cmd(cmd, O_IPFRAG, 0, 0);
3104 			break;
3105 
3106 		case TOK_LAYER2:
3107 			fill_cmd(cmd, O_LAYER2, 0, 0);
3108 			break;
3109 
3110 		case TOK_XMIT:
3111 		case TOK_RECV:
3112 		case TOK_VIA:
3113 			NEED1("recv, xmit, via require interface name"
3114 				" or address");
3115 			fill_iface((ipfw_insn_if *)cmd, av[0]);
3116 			ac--; av++;
3117 			if (F_LEN(cmd) == 0)	/* not a valid address */
3118 				break;
3119 			if (i == TOK_XMIT)
3120 				cmd->opcode = O_XMIT;
3121 			else if (i == TOK_RECV) {
3122 				cmd->opcode = O_RECV;
3123 				has_recv = 1;
3124 			} else if (i == TOK_VIA)
3125 				cmd->opcode = O_VIA;
3126 			break;
3127 
3128 		case TOK_ICMPCODES:
3129 			NEED1("icmpcodes requires list of codes");
3130 			fill_icmp(O_ICMPCODE, (ipfw_insn_u32 *)cmd, *av);
3131 			av++; ac--;
3132 			break;
3133 
3134 		case TOK_ICMPTYPES:
3135 			NEED1("icmptypes requires list of types");
3136 			fill_icmp(O_ICMPTYPE, (ipfw_insn_u32 *)cmd, *av);
3137 			av++; ac--;
3138 			break;
3139 
3140 		case TOK_IPTTL:
3141 			NEED1("ipttl requires TTL");
3142 			fill_cmd(cmd, O_IPTTL, 0, strtoul(*av, NULL, 0));
3143 			ac--; av++;
3144 			break;
3145 
3146 		case TOK_IPID:
3147 			NEED1("ipid requires length");
3148 			fill_cmd(cmd, O_IPID, 0, strtoul(*av, NULL, 0));
3149 			ac--; av++;
3150 			break;
3151 
3152 		case TOK_IPLEN:
3153 			NEED1("iplen requires length");
3154 			fill_cmd(cmd, O_IPLEN, 0, strtoul(*av, NULL, 0));
3155 			ac--; av++;
3156 			break;
3157 
3158 		case TOK_IPVER:
3159 			NEED1("ipver requires version");
3160 			fill_cmd(cmd, O_IPVER, 0, strtoul(*av, NULL, 0));
3161 			ac--; av++;
3162 			break;
3163 
3164 		case TOK_IPPRECEDENCE:
3165 			NEED1("ipprecedence requires value");
3166 			fill_cmd(cmd, O_IPPRECEDENCE, 0,
3167 			    (strtoul(*av, NULL, 0) & 7) << 5);
3168 			ac--; av++;
3169 			break;
3170 
3171 		case TOK_IPOPTS:
3172 			NEED1("missing argument for ipoptions");
3173 			fill_flags(cmd, O_IPOPT, f_ipopts, *av);
3174 			ac--; av++;
3175 			break;
3176 
3177 		case TOK_IPTOS:
3178 			NEED1("missing argument for iptos");
3179 			fill_flags(cmd, O_IPTOS, f_iptos, *av);
3180 			ac--; av++;
3181 			break;
3182 
3183 		case TOK_UID:
3184 			NEED1("uid requires argument");
3185 		    {
3186 			char *end;
3187 			uid_t uid;
3188 			struct passwd *pwd;
3189 
3190 			cmd->opcode = O_UID;
3191 			uid = strtoul(*av, &end, 0);
3192 			pwd = (*end == '\0') ? getpwuid(uid) : getpwnam(*av);
3193 			if (pwd == NULL)
3194 				errx(EX_DATAERR, "uid \"%s\" nonexistent", *av);
3195 			cmd32->d[0] = pwd->pw_uid;
3196 			cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3197 			ac--; av++;
3198 		    }
3199 			break;
3200 
3201 		case TOK_GID:
3202 			NEED1("gid requires argument");
3203 		    {
3204 			char *end;
3205 			gid_t gid;
3206 			struct group *grp;
3207 
3208 			cmd->opcode = O_GID;
3209 			gid = strtoul(*av, &end, 0);
3210 			grp = (*end == '\0') ? getgrgid(gid) : getgrnam(*av);
3211 			if (grp == NULL)
3212 				errx(EX_DATAERR, "gid \"%s\" nonexistent", *av);
3213 			cmd32->d[0] = grp->gr_gid;
3214 			cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3215 			ac--; av++;
3216 		    }
3217 			break;
3218 
3219 		case TOK_ESTAB:
3220 			fill_cmd(cmd, O_ESTAB, 0, 0);
3221 			break;
3222 
3223 		case TOK_SETUP:
3224 			fill_cmd(cmd, O_TCPFLAGS, 0,
3225 				(TH_SYN) | ( (TH_ACK) & 0xff) <<8 );
3226 			break;
3227 
3228 		case TOK_TCPOPTS:
3229 			NEED1("missing argument for tcpoptions");
3230 			fill_flags(cmd, O_TCPOPTS, f_tcpopts, *av);
3231 			ac--; av++;
3232 			break;
3233 
3234 		case TOK_TCPSEQ:
3235 		case TOK_TCPACK:
3236 			NEED1("tcpseq/tcpack requires argument");
3237 			cmd->len = F_INSN_SIZE(ipfw_insn_u32);
3238 			cmd->opcode = (i == TOK_TCPSEQ) ? O_TCPSEQ : O_TCPACK;
3239 			cmd32->d[0] = htonl(strtoul(*av, NULL, 0));
3240 			ac--; av++;
3241 			break;
3242 
3243 		case TOK_TCPWIN:
3244 			NEED1("tcpwin requires length");
3245 			fill_cmd(cmd, O_TCPWIN, 0,
3246 			    htons(strtoul(*av, NULL, 0)));
3247 			ac--; av++;
3248 			break;
3249 
3250 		case TOK_TCPFLAGS:
3251 			NEED1("missing argument for tcpflags");
3252 			cmd->opcode = O_TCPFLAGS;
3253 			fill_flags(cmd, O_TCPFLAGS, f_tcpflags, *av);
3254 			ac--; av++;
3255 			break;
3256 
3257 		case TOK_REDIRECT:
3258 			if (open_par)
3259 				errx(EX_USAGE, "rdr cannot be part "
3260 				    "of an or block");
3261 			if (have_state) {
3262 				errx(EX_USAGE, "only one of rdr, keep-state "
3263 				    "and limit is allowed");
3264 			}
3265 			have_state = cmd;
3266 			NEED1("rdr needs address and port");
3267 			fill_rdr(cmd, *av);
3268 			ac--; av++;
3269 			break;
3270 
3271 		case TOK_KEEPSTATE:
3272 			if (open_par)
3273 				errx(EX_USAGE, "keep-state cannot be part "
3274 				    "of an or block");
3275 			if (have_state) {
3276 				errx(EX_USAGE, "only one of rdr, keep-state "
3277 				    "and limit is allowed");
3278 			}
3279 			have_state = cmd;
3280 			fill_cmd(cmd, O_KEEP_STATE, 0, 0);
3281 			break;
3282 
3283 		case TOK_LIMIT:
3284 			if (open_par)
3285 				errx(EX_USAGE, "limit cannot be part "
3286 				    "of an or block");
3287 			if (have_state) {
3288 				errx(EX_USAGE, "only one of rdr, keep-state "
3289 				    "and limit is allowed");
3290 			}
3291 			NEED1("limit needs mask and # of connections");
3292 			have_state = cmd;
3293 		    {
3294 			ipfw_insn_limit *c = (ipfw_insn_limit *)cmd;
3295 
3296 			cmd->len = F_INSN_SIZE(ipfw_insn_limit);
3297 			cmd->opcode = O_LIMIT;
3298 			c->limit_mask = 0;
3299 			c->conn_limit = 0;
3300 			for (; ac >1 ;) {
3301 				int val;
3302 
3303 				val = match_token(limit_masks, *av);
3304 				if (val <= 0)
3305 					break;
3306 				c->limit_mask |= val;
3307 				ac--; av++;
3308 			}
3309 			c->conn_limit = atoi(*av);
3310 			if (c->conn_limit == 0)
3311 				errx(EX_USAGE, "limit: limit must be >0");
3312 			if (c->limit_mask == 0)
3313 				errx(EX_USAGE, "missing limit mask");
3314 			ac--; av++;
3315 		    }
3316 			break;
3317 
3318 		case TOK_PROTO:
3319 			NEED1("missing protocol");
3320 			if (add_proto(cmd, *av)) {
3321 				proto = cmd->arg1;
3322 				ac--; av++;
3323 			} else
3324 				errx(EX_DATAERR, "invalid protocol ``%s''", *av);
3325 			break;
3326 
3327 		case TOK_SRCIP:
3328 			NEED1("missing source IP");
3329 			if (add_srcip(cmd, *av)) {
3330 				ac--; av++;
3331 			}
3332 			break;
3333 
3334 		case TOK_DSTIP:
3335 			NEED1("missing destination IP");
3336 			if (add_dstip(cmd, *av)) {
3337 				ac--; av++;
3338 			}
3339 			break;
3340 
3341 		case TOK_SRCPORT:
3342 			NEED1("missing source port");
3343 			if (!strncmp(*av, "any", strlen(*av)) ||
3344 			    add_ports(cmd, *av, proto, O_IP_SRCPORT)) {
3345 				ac--; av++;
3346 			} else
3347 				errx(EX_DATAERR, "invalid source port %s", *av);
3348 			break;
3349 
3350 		case TOK_DSTPORT:
3351 			NEED1("missing destination port");
3352 			if (!strncmp(*av, "any", strlen(*av)) ||
3353 			    add_ports(cmd, *av, proto, O_IP_DSTPORT)) {
3354 				if (F_LEN(cmd) != 0)
3355 					has_dstport =1;
3356 				ac--; av++;
3357 			} else
3358 				errx(EX_DATAERR, "invalid destination port %s",
3359 				    *av);
3360 			break;
3361 
3362 		case TOK_MAC:
3363 			if (ac < 2)
3364 				errx(EX_USAGE, "MAC dst-mac src-mac");
3365 			if (add_mac(cmd, ac, av)) {
3366 				ac -= 2; av += 2;
3367 			}
3368 			break;
3369 
3370 		case TOK_MACTYPE:
3371 			NEED1("missing mac type");
3372 			if (!add_mactype(cmd, ac, *av))
3373 				errx(EX_DATAERR, "invalid mac type %s", *av);
3374 			ac--; av++;
3375 			break;
3376 
3377 		default:
3378 			errx(EX_USAGE, "unrecognised option [%d] %s\n", i, s1);
3379 		}
3380 		if (F_LEN(cmd) > 0) {	/* prepare to advance */
3381 			prev = cmd;
3382 			cmd = next_cmd(cmd);
3383 		}
3384 	}
3385 
3386 done:
3387 	/*
3388 	 * Now copy stuff into the rule.
3389 	 * If we have a keep-state option, the first instruction
3390 	 * must be a PROBE_STATE (which is generated here).
3391 	 * If we have a LOG option, it was stored as the first command,
3392 	 * and now must be moved to the top of the action part.
3393 	 */
3394 	dst = (ipfw_insn *)rule->cmd;
3395 
3396 	/*
3397 	 * First thing to write into the command stream is the match probability.
3398 	 */
3399 	if (match_prob != 1) { /* 1 means always match */
3400 		dst->opcode = O_PROB;
3401 		dst->len = 2;
3402 		*((int32_t *)(dst+1)) = (int32_t)(match_prob * 0x7fffffff);
3403 		dst += dst->len;
3404 	}
3405 
3406 	/*
3407 	 * generate O_PROBE_STATE if necessary
3408 	 */
3409 	if (have_state && have_state->opcode != O_CHECK_STATE) {
3410 		fill_cmd(dst, O_PROBE_STATE, 0, 0);
3411 		dst = next_cmd(dst);
3412 	}
3413 	/*
3414 	 * copy all commands but O_LOG, O_KEEP_STATE, O_LIMIT, O_REDIRECT
3415 	 */
3416 	for (src = (ipfw_insn *)cmdbuf; src != cmd; src += i) {
3417 		i = F_LEN(src);
3418 
3419 		switch (src->opcode) {
3420 		case O_LOG:
3421 		case O_KEEP_STATE:
3422 		case O_LIMIT:
3423 		case O_REDIRECT:
3424 			break;
3425 		default:
3426 			bcopy(src, dst, i * sizeof(u_int32_t));
3427 			dst += i;
3428 		}
3429 	}
3430 
3431 	/*
3432 	 * put back the have_state command as last opcode
3433 	 */
3434 	if (have_state && have_state->opcode != O_CHECK_STATE) {
3435 		i = F_LEN(have_state);
3436 		bcopy(have_state, dst, i * sizeof(u_int32_t));
3437 		dst += i;
3438 
3439 		if (have_state->opcode == O_REDIRECT &&
3440 		    (!has_dstport || !has_recv))
3441 			errx(EX_USAGE, "missing \'dst-port\' or \'recv\'");
3442 	}
3443 	/*
3444 	 * start action section
3445 	 */
3446 	rule->act_ofs = dst - rule->cmd;
3447 
3448 	/*
3449 	 * put back O_LOG if necessary
3450 	 */
3451 	src = (ipfw_insn *)cmdbuf;
3452 	if ( src->opcode == O_LOG ) {
3453 		i = F_LEN(src);
3454 		bcopy(src, dst, i * sizeof(u_int32_t));
3455 		dst += i;
3456 	}
3457 	/*
3458 	 * copy all other actions
3459 	 */
3460 	for (src = (ipfw_insn *)actbuf; src != action; src += i) {
3461 		i = F_LEN(src);
3462 		bcopy(src, dst, i * sizeof(u_int32_t));
3463 		dst += i;
3464 	}
3465 
3466 	rule->cmd_len = (u_int32_t *)dst - (u_int32_t *)(rule->cmd);
3467 	i = (uint8_t *)dst - (uint8_t *)rule;
3468 	if (getsockopt(s, IPPROTO_IP, IP_FW_ADD, rule, &i) == -1)
3469 		err(EX_UNAVAILABLE, "getsockopt(%s)", "IP_FW_ADD");
3470 	if (!do_quiet)
3471 		show_ipfw(rule, 10, 10);
3472 }
3473 
3474 static void
zero(int ac,char * av[])3475 zero(int ac, char *av[])
3476 {
3477 	int rulenum;
3478 	int failed = EX_OK;
3479 
3480 	av++; ac--;
3481 
3482 	if (!ac) {
3483 		/* clear all entries */
3484 		if (setsockopt(s, IPPROTO_IP, IP_FW_ZERO, NULL, 0) < 0)
3485 			err(EX_UNAVAILABLE, "setsockopt(%s)", "IP_FW_ZERO");
3486 		if (!do_quiet)
3487 			printf("Accounting cleared.\n");
3488 
3489 		return;
3490 	}
3491 
3492 	while (ac) {
3493 		/* Rule number */
3494 		if (isdigit(**av)) {
3495 			rulenum = atoi(*av);
3496 			av++;
3497 			ac--;
3498 			if (setsockopt(s, IPPROTO_IP,
3499 			    IP_FW_ZERO, &rulenum, sizeof rulenum)) {
3500 				warn("rule %u: setsockopt(IP_FW_ZERO)",
3501 				    rulenum);
3502 				failed = EX_UNAVAILABLE;
3503 			} else if (!do_quiet)
3504 				printf("Entry %d cleared\n", rulenum);
3505 		} else {
3506 			errx(EX_USAGE, "invalid rule number ``%s''", *av);
3507 		}
3508 	}
3509 	if (failed != EX_OK)
3510 		exit(failed);
3511 }
3512 
3513 static void
resetlog(int ac,char * av[])3514 resetlog(int ac, char *av[])
3515 {
3516 	int rulenum;
3517 	int failed = EX_OK;
3518 
3519 	av++; ac--;
3520 
3521 	if (!ac) {
3522 		/* clear all entries */
3523 		if (setsockopt(s, IPPROTO_IP, IP_FW_RESETLOG, NULL, 0) < 0)
3524 			err(EX_UNAVAILABLE, "setsockopt(IP_FW_RESETLOG)");
3525 		if (!do_quiet)
3526 			printf("Logging counts reset.\n");
3527 
3528 		return;
3529 	}
3530 
3531 	while (ac) {
3532 		/* Rule number */
3533 		if (isdigit(**av)) {
3534 			rulenum = atoi(*av);
3535 			av++;
3536 			ac--;
3537 			if (setsockopt(s, IPPROTO_IP,
3538 			    IP_FW_RESETLOG, &rulenum, sizeof rulenum)) {
3539 				warn("rule %u: setsockopt(IP_FW_RESETLOG)",
3540 				    rulenum);
3541 				failed = EX_UNAVAILABLE;
3542 			} else if (!do_quiet)
3543 				printf("Entry %d logging count reset\n",
3544 				    rulenum);
3545 		} else {
3546 			errx(EX_DATAERR, "invalid rule number ``%s''", *av);
3547 		}
3548 	}
3549 	if (failed != EX_OK)
3550 		exit(failed);
3551 }
3552 
3553 static void
flush(void)3554 flush(void)
3555 {
3556 	int cmd = do_pipe ? IP_DUMMYNET_FLUSH : IP_FW_FLUSH;
3557 
3558 	if (!do_force && !do_quiet) { /* need to ask user */
3559 		int c;
3560 
3561 		printf("Are you sure? [yn] ");
3562 		fflush(stdout);
3563 		do {
3564 			c = toupper(getc(stdin));
3565 			while (c != '\n' && getc(stdin) != '\n')
3566 				if (feof(stdin))
3567 					return; /* and do not flush */
3568 		} while (c != 'Y' && c != 'N');
3569 		printf("\n");
3570 		if (c == 'N')	/* user said no */
3571 			return;
3572 	}
3573 	if (setsockopt(s, IPPROTO_IP, cmd, NULL, 0) < 0)
3574 		err(EX_UNAVAILABLE, "setsockopt(IP_%s_FLUSH)",
3575 		    do_pipe ? "DUMMYNET" : "FW");
3576 	if (!do_quiet)
3577 		printf("Flushed all %s.\n", do_pipe ? "pipes" : "rules");
3578 }
3579 
3580 static void
table_create(int ac,char ** av)3581 table_create(int ac, char **av)
3582 {
3583 	struct ipfw_ioc_table tbl;
3584 	char *eptr;
3585 
3586 	ac--;
3587 	av++;
3588 
3589 	if (ac == 0)
3590 		errx(EX_DATAERR, "missing table id");
3591 
3592 	memset(&tbl, 0, sizeof(tbl));
3593 	tbl.tableid = strtoul(*av, &eptr, 0);
3594 	if (*eptr != '\0')
3595 		errx(EX_DATAERR, "invalid table id %s", *av);
3596 	if (setsockopt(s, IPPROTO_IP, IP_FW_TBL_CREATE, &tbl, sizeof(tbl)) < 0)
3597 		err(EX_UNAVAILABLE, "setsockopt(IP_FW_TBL_CREATE)");
3598 	if (!do_quiet)
3599 		printf("Created table %d\n", tbl.tableid);
3600 }
3601 
3602 static void
table_flush(int ac,char ** av,int opt)3603 table_flush(int ac, char **av, int opt)
3604 {
3605 	struct ipfw_ioc_table tbl;
3606 	char *eptr;
3607 
3608 	ac--;
3609 	av++;
3610 
3611 	memset(&tbl, 0, sizeof(tbl));
3612 
3613 	if (ac == 0) {
3614 		if (opt == IP_FW_TBL_FLUSH) {
3615 			/* Flush all tables */
3616 			tbl.tableid = -1;
3617 			goto flush;
3618 		}
3619 		errx(EX_DATAERR, "missing table id");
3620 	}
3621 
3622 	tbl.tableid = strtoul(*av, &eptr, 0);
3623 	if (*eptr != '\0')
3624 		errx(EX_DATAERR, "invalid table id %s", *av);
3625 
3626 flush:
3627 	if (!do_force && !do_quiet) { /* need to ask user */
3628 		int c;
3629 
3630 		printf("Are you sure? [yn] ");
3631 		fflush(stdout);
3632 		do {
3633 			c = toupper(getc(stdin));
3634 			while (c != '\n' && getc(stdin) != '\n')
3635 				if (feof(stdin))
3636 					return; /* and do not flush */
3637 		} while (c != 'Y' && c != 'N');
3638 		printf("\n");
3639 		if (c == 'N')	/* user said no */
3640 			return;
3641 	}
3642 
3643 	if (setsockopt(s, IPPROTO_IP, opt, &tbl, sizeof(tbl)) < 0) {
3644 		err(EX_UNAVAILABLE, "setsockopt(IP_FW_TBL_%s)",
3645 		    opt == IP_FW_TBL_FLUSH ? "FLUSH" : "DESTROY");
3646 	}
3647 	if (!do_quiet) {
3648 		if (tbl.tableid >= 0) {
3649 			printf("%sed table %d\n",
3650 			    opt == IP_FW_TBL_FLUSH ? "Flush" : "Destroy",
3651 			    tbl.tableid);
3652 		} else {
3653 			printf("Flushed all tables\n");
3654 		}
3655 	}
3656 }
3657 
3658 static void
table_list(void)3659 table_list(void)
3660 {
3661 	struct ipfw_ioc_tbllist *list;
3662 	int table_max, i;
3663 	size_t len;
3664 	socklen_t len1;
3665 
3666 	len = sizeof(table_max);
3667 	if (sysctlbyname("net.inet.ip.fw.table_max", &table_max, &len,
3668 	    NULL, 0) < 0)
3669 		err(EX_UNAVAILABLE, "sysctl net.inet.ip.fw.table_max failed");
3670 
3671 	len1 = __offsetof(struct ipfw_ioc_tbllist, tables[table_max]);
3672 	list = malloc(len1);
3673 	list->tableid = -1;
3674 
3675 	if (getsockopt(s, IPPROTO_IP, IP_FW_TBL_GET, list, &len1) < 0)
3676 		err(EX_UNAVAILABLE, "getsockopt(IP_FW_TBL_GET)");
3677 
3678 	for (i = 0; i < list->tablecnt; ++i)
3679 		printf("%u\n", list->tables[i]);
3680 }
3681 
3682 /* XXX copied from route(8) */
3683 static void
inet_makenetandmask(in_addr_t net,struct sockaddr_in * in,struct sockaddr_in * in_mask,int bits)3684 inet_makenetandmask(in_addr_t net, struct sockaddr_in *in,
3685     struct sockaddr_in *in_mask, int bits)
3686 {
3687 	in_addr_t addr, mask = 0;
3688 	char *cp;
3689 
3690 	/*
3691 	 * XXX: This approach unable to handle 0.0.0.1/32 correctly
3692 	 * as inet_network() converts 0.0.0.1 and 1 equally.
3693 	 */
3694 	if (net <= 0xff)
3695 		addr = net << IN_CLASSA_NSHIFT;
3696 	else if (net <= 0xffff)
3697 		addr = net << IN_CLASSB_NSHIFT;
3698 	else if (net <= 0xffffff)
3699 		addr = net << IN_CLASSC_NSHIFT;
3700 	else
3701 		addr = net;
3702 
3703 	if (bits != 0)
3704 		mask = 0xffffffff << (32 - bits);
3705 	else if (net == 0)
3706 		mask = 0;
3707 	else if (IN_CLASSA(addr))
3708 		mask = IN_CLASSA_NET;
3709 	else if (IN_CLASSB(addr))
3710 		mask = IN_CLASSB_NET;
3711 	else if (IN_CLASSC(addr))
3712 		mask = IN_CLASSC_NET;
3713 	else if (IN_MULTICAST(addr))
3714 		mask = IN_CLASSD_NET;
3715 	else
3716 		mask = 0xffffffff;
3717 
3718 	in->sin_family = AF_INET;
3719 	in->sin_len = sizeof(struct sockaddr_in);
3720 	in->sin_addr.s_addr = htonl(addr);
3721 
3722 	if (mask != 0xffffffff) {
3723 		in_mask->sin_addr.s_addr = htonl(mask);
3724 		cp = (char *)(&in_mask->sin_addr + 1);
3725 		while (*--cp == 0 && cp > (char *)in_mask)
3726 			;
3727 		in_mask->sin_len = 1 + cp - (char *)in_mask;
3728 	} else {
3729 		in_mask->sin_len = 0;	/* mask as 'host mask' */
3730 	}
3731 }
3732 
3733 static void
table_alt(int ac,char ** av,int opt)3734 table_alt(int ac, char **av, int opt)
3735 {
3736 	struct ipfw_ioc_tblcont ent;
3737 	struct ipfw_ioc_tblent *te;
3738 	char *eptr;
3739 
3740 	--ac;
3741 	++av;
3742 	if (ac == 0)
3743 		errx(EX_DATAERR, "missing table id");
3744 
3745 	memset(&ent, 0, sizeof(ent));
3746 	ent.tableid = strtoul(*av, &eptr, 0);
3747 	ent.entcnt = 1;
3748 	te = &ent.ent[0];
3749 	if (*eptr != '\0')
3750 		errx(EX_DATAERR, "invalid table id %s", *av);
3751 
3752 	--ac;
3753 	++av;
3754 	if (ac == 0)
3755 		errx(EX_DATAERR, "missing addresses");
3756 
3757 	while (ac > 0) {
3758 		char *q;
3759 
3760 		q = strchr(*av, '/');
3761 		if (q != NULL) {
3762 			in_addr_t val;
3763 			int bits;
3764 
3765 			*q = '\0';
3766 			val = inet_network(*av);
3767 			*q = '/';
3768 			if (val == INADDR_NONE) {
3769 				fflush(stdout);
3770 				errx(EX_DATAERR, "invalid address %s", *av);
3771 			}
3772 
3773 			bits = strtoul(q + 1, &eptr, 0);
3774 			if (*eptr != '\0') {
3775 				fflush(stdout);
3776 				errx(EX_DATAERR, "invalid address %s", *av);
3777 			}
3778 			inet_makenetandmask(val, &te->key, &te->netmask, bits);
3779 		} else {
3780 			int n;
3781 
3782 			n = inet_pton(AF_INET, *av, &te->key.sin_addr);
3783 			if (n == 0) {
3784 				fflush(stdout);
3785 				errx(EX_DATAERR, "invalid address %s", *av);
3786 			} else if (n < 0) {
3787 				fflush(stdout);
3788 				err(EX_UNAVAILABLE, "inet_pton failed");
3789 			}
3790 			te->key.sin_family = AF_INET;
3791 			te->key.sin_len = sizeof(struct sockaddr_in);
3792 			te->netmask.sin_len = 0;	/* mark as 'host mask' */
3793 		}
3794 
3795 		if (setsockopt(s, IPPROTO_IP, opt, &ent, sizeof(ent)) < 0) {
3796 			if (opt == IP_FW_TBL_ADD && errno == EEXIST) {
3797 				printf("Failed to add %s to table %d\n",
3798 				     *av, ent.tableid);
3799 			} else if (opt == IP_FW_TBL_DEL && errno == ESRCH) {
3800 				printf("Failed to delete %s from table %d\n",
3801 				     *av, ent.tableid);
3802 			} else {
3803 				fflush(stdout);
3804 				err(EX_UNAVAILABLE, "setsockopt(IP_FW_TBL_%s)",
3805 				    opt == IP_FW_TBL_ADD ? "ADD" : "DEL");
3806 			}
3807 		} else if (!do_quiet) {
3808 			printf("%sed %s %s table %d\n",
3809 			    opt == IP_FW_TBL_ADD ? "Add" : "Delet", *av,
3810 			    opt == IP_FW_TBL_ADD ? "to" : "from", ent.tableid);
3811 		}
3812 
3813 		--ac;
3814 		++av;
3815 	}
3816 }
3817 
3818 static void
table_show(int ac,char ** av)3819 table_show(int ac, char **av)
3820 {
3821 	struct ipfw_ioc_tblcont *cont = NULL;
3822 	int tableid, count = 128, i, uwidth = 0, lwidth = 0;
3823 	char *eptr;
3824 
3825 	--ac;
3826 	++av;
3827 	if (ac == 0)
3828 		errx(EX_DATAERR, "missing table id");
3829 
3830 	tableid = strtoul(*av, &eptr, 0);
3831 	if (*eptr != '\0')
3832 		errx(EX_DATAERR, "invalid table id %s", *av);
3833 
3834 	for (;;) {
3835 		socklen_t len;
3836 
3837 		len = __offsetof(struct ipfw_ioc_tblcont, ent[count]);
3838 		cont = reallocf(cont, len);
3839 		cont->tableid = tableid;
3840 
3841 		if (getsockopt(s, IPPROTO_IP, IP_FW_TBL_GET, cont, &len) < 0) {
3842 			if (errno == E2BIG) {
3843 				count *= 2;
3844 				continue;
3845 			}
3846 			err(EX_UNAVAILABLE, "getsockopt(IP_FW_TBL_GET)");
3847 		}
3848 		break;
3849 	}
3850 	if (cont->entcnt == 0)
3851 		return;
3852 
3853 	if (do_acct) {
3854 		for (i = 0; i < cont->entcnt; ++i) {
3855 			int width;
3856 
3857 			width = snprintf(NULL, 0, "%ju",
3858 			    (uintmax_t)cont->ent[i].use);
3859 			if (width > uwidth)
3860 				uwidth = width;
3861 		}
3862 	}
3863 
3864 	for (i = 0; i < cont->entcnt; ++i) {
3865 		const struct ipfw_ioc_tblent *te = &cont->ent[i];
3866 		char addr[INET_ADDRSTRLEN];
3867 
3868 		if (do_acct)
3869 			printf("%*ju ", uwidth, (uintmax_t)te->use);
3870 		if (do_time) {
3871 			char timestr[30];
3872 
3873 			if (lwidth == 0) {
3874 				time_t t0 = 0;
3875 
3876 				strcpy(timestr, ctime(&t0));
3877 				*strchr(timestr, '\n') = '\0';
3878 				lwidth = strlen(timestr);
3879 			}
3880 			if (te->last_used) {
3881 				time_t t = _long_to_time(te->last_used);
3882 
3883 				strcpy(timestr, ctime(&t));
3884 				*strchr(timestr, '\n') = '\0';
3885 				printf("%s ", timestr);
3886 			} else {
3887 				printf("%*s ", lwidth, " ");
3888 			}
3889 		}
3890 
3891 		if (te->netmask.sin_len == 0) {
3892 			printf("%s\n", inet_ntop(AF_INET,
3893 			    &te->key.sin_addr, addr, sizeof(addr)));
3894 		} else {
3895 			struct sockaddr_in mask;
3896 			int b;
3897 
3898 			memset(&mask, 0, sizeof(mask));
3899 			memcpy(&mask, &te->netmask,
3900 			    te->netmask.sin_len);
3901 			b = ffs(ntohl(te->netmask.sin_addr.s_addr));
3902 			b = 32 - (b - 1);
3903 
3904 			printf("%s/%d\n", inet_ntop(AF_INET,
3905 			    &te->key.sin_addr, addr, sizeof(addr)), b);
3906 		}
3907 	}
3908 }
3909 
3910 static void
table_zero(int ac,char ** av)3911 table_zero(int ac, char **av)
3912 {
3913 	struct ipfw_ioc_table tbl;
3914 
3915 	--ac;
3916 	++av;
3917 
3918 	memset(&tbl, 0, sizeof(tbl));
3919 	if (ac == 0) {
3920 		tbl.tableid = -1;
3921 	} else {
3922 		char *eptr;
3923 
3924 		tbl.tableid = strtoul(*av, &eptr, 0);
3925 		if (*eptr != '\0')
3926 			errx(EX_DATAERR, "invalid table id %s", *av);
3927 	}
3928 
3929 	if (setsockopt(s, IPPROTO_IP, IP_FW_TBL_ZERO, &tbl, sizeof(tbl)) < 0)
3930 		err(EX_UNAVAILABLE, "setsockopt(IP_FW_TBL_ZERO)");
3931 	if (!do_quiet)
3932 		printf("Accounting cleared\n");
3933 }
3934 
3935 static void
table_expire(int ac,char ** av)3936 table_expire(int ac, char **av)
3937 {
3938 	struct ipfw_ioc_tblexp tbl;
3939 	char *eptr;
3940 	socklen_t len;
3941 
3942 	--ac;
3943 	++av;
3944 
3945 	memset(&tbl, 0, sizeof(tbl));
3946 	if (ac == 0) {
3947 		errx(EX_DATAERR, "missing expire time");
3948 	} else if (ac == 1) {
3949 		tbl.tableid = -1;
3950 	} else {
3951 		tbl.tableid = strtoul(*av, &eptr, 0);
3952 		if (*eptr != '\0')
3953 			errx(EX_DATAERR, "invalid table id %s", *av);
3954 		--ac;
3955 		++av;
3956 	}
3957 
3958 	tbl.expire = strtoul(*av, &eptr, 0);
3959 	if (*eptr != '\0')
3960 		errx(EX_DATAERR, "invalid expire timeout %s", *av);
3961 
3962 	if (!do_force && !do_quiet) { /* need to ask user */
3963 		int c;
3964 
3965 		printf("Are you sure? [yn] ");
3966 		fflush(stdout);
3967 		do {
3968 			c = toupper(getc(stdin));
3969 			while (c != '\n' && getc(stdin) != '\n')
3970 				if (feof(stdin))
3971 					return; /* and do not flush */
3972 		} while (c != 'Y' && c != 'N');
3973 		printf("\n");
3974 		if (c == 'N')	/* user said no */
3975 			return;
3976 	}
3977 
3978 	len = sizeof(tbl);
3979 	if (getsockopt(s, IPPROTO_IP, IP_FW_TBL_EXPIRE, &tbl, &len) < 0)
3980 		err(EX_UNAVAILABLE, "getsockopt(IP_FW_TBL_EXPIRE)");
3981 	if (!do_quiet) {
3982 		printf("Expired %d address%s\n", tbl.expcnt,
3983 		    (tbl.expcnt == 0 || tbl.expcnt > 1) ? "es" : "");
3984 	}
3985 }
3986 
3987 static int
ipfw_main(int ac,char ** av)3988 ipfw_main(int ac, char **av)
3989 {
3990 	int ch;
3991 
3992 	if (ac == 1)
3993 		show_usage();
3994 
3995 	/* Set the force flag for non-interactive processes */
3996 	do_force = !isatty(STDIN_FILENO);
3997 
3998 	optind = optreset = 1;
3999 	while ((ch = getopt(ac, av, "hs:acdefNqStv")) != -1)
4000 		switch (ch) {
4001 		case 'h': /* help */
4002 			help();
4003 			break;	/* NOTREACHED */
4004 
4005 		case 's': /* sort */
4006 			do_sort = atoi(optarg);
4007 			break;
4008 		case 'a':
4009 			do_acct = 1;
4010 			break;
4011 		case 'c':
4012 			do_compact = 1;
4013 			break;
4014 		case 'd':
4015 			do_dynamic = 1;
4016 			break;
4017 		case 'e':
4018 			do_expired = 1;
4019 			break;
4020 		case 'f':
4021 			do_force = 1;
4022 			break;
4023 		case 'N':
4024 			do_resolv = 1;
4025 			break;
4026 		case 'q':
4027 			do_quiet = 1;
4028 			break;
4029 		case 'S':
4030 			show_sets = 1;
4031 			break;
4032 		case 't':
4033 			do_time = 1;
4034 			break;
4035 		case 'v': /* verbose */
4036 			verbose++;
4037 			break;
4038 		default:
4039 			show_usage();
4040 		}
4041 
4042 	ac -= optind;
4043 	av += optind;
4044 	NEED1("bad arguments, for usage summary ``ipfw''");
4045 
4046 	/*
4047 	 * Reset do_pipe and do_table.
4048 	 */
4049 	do_pipe = 0;
4050 	do_table = 0;
4051 
4052 	/*
4053 	 * optional: pipe, queue or table
4054 	 */
4055 	if (!strncmp(*av, "pipe", strlen(*av))) {
4056 		do_pipe = 1;
4057 		ac--;
4058 		av++;
4059 	} else if (!strncmp(*av, "queue", strlen(*av))) {
4060 		do_pipe = 2;
4061 		ac--;
4062 		av++;
4063 	} else if (!strncmp(*av, "table", strlen(*av))) {
4064 		do_table = 1;
4065 		ac--;
4066 		av++;
4067 	}
4068 	NEED1("missing command");
4069 
4070 	/*
4071 	 * for pipes, queues and table we normally say 'pipe NN config'
4072 	 * but the code is easier to parse as 'pipe config NN' so we
4073 	 * swap the two arguments.
4074 	 */
4075 	if ((do_pipe > 0 || do_table > 0) && ac > 1 &&
4076 	    *av[0] >= '0' && *av[0] <= '9') {
4077 		char *p = av[0];
4078 		av[0] = av[1];
4079 		av[1] = p;
4080 	}
4081 	if (do_table) {
4082 		if (!strncmp(*av, "create", strlen(*av)))
4083 			table_create(ac, av);
4084 		else if (!strncmp(*av, "destroy", strlen(*av)))
4085 			table_flush(ac, av, IP_FW_TBL_DESTROY);
4086 		else if (!strncmp(*av, "list", strlen(*av)))
4087 			table_list();
4088 		else if (!strncmp(*av, "add", strlen(*av)))
4089 			table_alt(ac, av, IP_FW_TBL_ADD);
4090 		else if (!strncmp(*av, "delete", strlen(*av)))
4091 			table_alt(ac, av, IP_FW_TBL_DEL);
4092 		else if (!strncmp(*av, "flush", strlen(*av)))
4093 			table_flush(ac, av, IP_FW_TBL_FLUSH);
4094 		else if (!strncmp(*av, "print", strlen(*av)))
4095 			table_show(ac, av);
4096 		else if (!strncmp(*av, "show", strlen(*av))) {
4097 			do_acct++;
4098 			table_show(ac, av);
4099 		} else if (!strncmp(*av, "zero", strlen(*av)))
4100 			table_zero(ac, av);
4101 		else if (!strncmp(*av, "expire", strlen(*av)))
4102 			table_expire(ac, av);
4103 		else
4104 			errx(EX_USAGE, "bad command `%s'", *av);
4105 		return 0;
4106 	}
4107 	if (!strncmp(*av, "add", strlen(*av)))
4108 		add(ac, av);
4109 	else if (do_pipe && !strncmp(*av, "config", strlen(*av)))
4110 		config_pipe(ac, av);
4111 	else if (!strncmp(*av, "delete", strlen(*av)))
4112 		delete(ac, av);
4113 	else if (!strncmp(*av, "flush", strlen(*av)))
4114 		flush();
4115 	else if (!strncmp(*av, "zero", strlen(*av)))
4116 		zero(ac, av);
4117 	else if (!strncmp(*av, "resetlog", strlen(*av)))
4118 		resetlog(ac, av);
4119 	else if (!strncmp(*av, "print", strlen(*av)) ||
4120 	         !strncmp(*av, "list", strlen(*av)))
4121 		list(ac, av);
4122 	else if (!strncmp(*av, "enable", strlen(*av)))
4123 		sysctl_handler(ac, av, 1);
4124 	else if (!strncmp(*av, "disable", strlen(*av)))
4125 		sysctl_handler(ac, av, 0);
4126 	else if (!strncmp(*av, "set", strlen(*av)))
4127 		sets_handler(ac, av);
4128 	else if (!strncmp(*av, "show", strlen(*av))) {
4129 		do_acct++;
4130 		list(ac, av);
4131 	} else
4132 		errx(EX_USAGE, "bad command `%s'", *av);
4133 	return 0;
4134 }
4135 
4136 
4137 static void
ipfw_readfile(int ac,char * av[])4138 ipfw_readfile(int ac, char *av[])
4139 {
4140 #define MAX_ARGS	32
4141 #define WHITESP		" \t\f\v\n\r"
4142 	char	buf[BUFSIZ];
4143 	char	*a, *p, *args[MAX_ARGS], *cmd = NULL;
4144 	char	linename[20];
4145 	int	i=0, lineno=0, qflag=0, pflag=0, status;
4146 	FILE	*f = NULL;
4147 	pid_t	preproc = 0;
4148 	int	c;
4149 
4150 	while ((c = getopt(ac, av, "D:U:p:q")) != -1)
4151 		switch(c) {
4152 		case 'D':
4153 			if (!pflag)
4154 				errx(EX_USAGE, "-D requires -p");
4155 			if (i > MAX_ARGS - 2)
4156 				errx(EX_USAGE,
4157 				     "too many -D or -U options");
4158 			args[i++] = __DECONST(char *, "-D");
4159 			args[i++] = optarg;
4160 			break;
4161 
4162 		case 'U':
4163 			if (!pflag)
4164 				errx(EX_USAGE, "-U requires -p");
4165 			if (i > MAX_ARGS - 2)
4166 				errx(EX_USAGE,
4167 				     "too many -D or -U options");
4168 			args[i++] = __DECONST(char *, "-U");
4169 			args[i++] = optarg;
4170 			break;
4171 
4172 		case 'p':
4173 			pflag = 1;
4174 			cmd = optarg;
4175 			args[0] = cmd;
4176 			i = 1;
4177 			break;
4178 
4179 		case 'q':
4180 			qflag = 1;
4181 			break;
4182 
4183 		default:
4184 			errx(EX_USAGE, "bad arguments, for usage"
4185 			     " summary ``ipfw''");
4186 		}
4187 
4188 	av += optind;
4189 	ac -= optind;
4190 	if (ac != 1)
4191 		errx(EX_USAGE, "extraneous filename arguments");
4192 
4193 	if ((f = fopen(av[0], "r")) == NULL)
4194 		err(EX_UNAVAILABLE, "fopen: %s", av[0]);
4195 
4196 	if (pflag) {
4197 		/* pipe through preprocessor (cpp or m4) */
4198 		int pipedes[2];
4199 
4200 		args[i] = NULL;
4201 
4202 		if (pipe(pipedes) == -1)
4203 			err(EX_OSERR, "cannot create pipe");
4204 
4205 		switch((preproc = fork())) {
4206 		case -1:
4207 			err(EX_OSERR, "cannot fork");
4208 
4209 		case 0:
4210 			/* child */
4211 			if (dup2(fileno(f), 0) == -1
4212 			    || dup2(pipedes[1], 1) == -1)
4213 				err(EX_OSERR, "dup2()");
4214 			fclose(f);
4215 			close(pipedes[1]);
4216 			close(pipedes[0]);
4217 			execvp(cmd, args);
4218 			err(EX_OSERR, "execvp(%s) failed", cmd);
4219 
4220 		default:
4221 			/* parent */
4222 			fclose(f);
4223 			close(pipedes[1]);
4224 			if ((f = fdopen(pipedes[0], "r")) == NULL) {
4225 				int savederrno = errno;
4226 
4227 				kill(preproc, SIGTERM);
4228 				errno = savederrno;
4229 				err(EX_OSERR, "fdopen()");
4230 			}
4231 		}
4232 	}
4233 
4234 	while (fgets(buf, BUFSIZ, f)) {
4235 		lineno++;
4236 		snprintf(linename, sizeof(linename), "Line %d", lineno);
4237 		args[0] = linename;
4238 
4239 		if (*buf == '#')
4240 			continue;
4241 		if ((p = strchr(buf, '#')) != NULL)
4242 			*p = '\0';
4243 		i = 1;
4244 		if (qflag)
4245 			args[i++] = __DECONST(char *, "-q");
4246 		for (a = strtok(buf, WHITESP);
4247 		    a && i < MAX_ARGS; a = strtok(NULL, WHITESP), i++)
4248 			args[i] = a;
4249 		if (i == (qflag? 2: 1))
4250 			continue;
4251 		if (i == MAX_ARGS)
4252 			errx(EX_USAGE, "%s: too many arguments",
4253 			    linename);
4254 		args[i] = NULL;
4255 
4256 		ipfw_main(i, args);
4257 	}
4258 	fclose(f);
4259 	if (pflag) {
4260 		if (waitpid(preproc, &status, 0) == -1)
4261 			errx(EX_OSERR, "waitpid()");
4262 		if (WIFEXITED(status) && WEXITSTATUS(status) != EX_OK)
4263 			errx(EX_UNAVAILABLE,
4264 			    "preprocessor exited with status %d",
4265 			    WEXITSTATUS(status));
4266 		else if (WIFSIGNALED(status))
4267 			errx(EX_UNAVAILABLE,
4268 			    "preprocessor exited with signal %d",
4269 			    WTERMSIG(status));
4270 	}
4271 }
4272 
4273 int
main(int ac,char * av[])4274 main(int ac, char *av[])
4275 {
4276 	s = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);
4277 	if (s < 0)
4278 		err(EX_UNAVAILABLE, "socket");
4279 
4280 	/*
4281 	 * If the last argument is an absolute pathname, interpret it
4282 	 * as a file to be preprocessed.
4283 	 */
4284 
4285 	if (ac > 1 && av[ac - 1][0] == '/' && access(av[ac - 1], R_OK) == 0)
4286 		ipfw_readfile(ac, av);
4287 	else
4288 		ipfw_main(ac, av);
4289 	return EX_OK;
4290 }
4291