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rtutil.c revision 1.8 
      1 /*	$NetBSD: rtutil.c,v 1.8 2016/04/04 07:37:07 ozaki-r Exp $	*/
      2 /*	$OpenBSD: show.c,v 1.1 2006/05/27 19:16:37 claudio Exp $	*/
      3 
      4 /*
      5  * Copyright (c) 1983, 1988, 1993
      6  *	The Regents of the University of California.  All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  * 3. Neither the name of the University nor the names of its contributors
     17  *    may be used to endorse or promote products derived from this software
     18  *    without specific prior written permission.
     19  *
     20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     30  * SUCH DAMAGE.
     31  */
     32 
     33 #include <sys/param.h>
     34 #include <sys/protosw.h>
     35 #include <sys/socket.h>
     36 #include <sys/sysctl.h>
     37 
     38 #include <net/if.h>
     39 #include <net/if_dl.h>
     40 #include <net/if_types.h>
     41 #include <net/pfvar.h>
     42 #include <net/pfkeyv2.h>
     43 #include <net/route.h>
     44 #include <netinet/in.h>
     45 #include <netinet/if_ether.h>
     46 #include <netatalk/at.h>
     47 #include <netmpls/mpls.h>
     48 #include <arpa/inet.h>
     49 
     50 #include <err.h>
     51 #include <errno.h>
     52 #include <netdb.h>
     53 #include <stdio.h>
     54 #include <stddef.h>
     55 #include <stdlib.h>
     56 #include <string.h>
     57 #include <unistd.h>
     58 
     59 #include "prog_ops.h"
     60 #include "rtutil.h"
     61 
     62 
     63 #define PLEN    (LONG_BIT / 4 + 2)
     64 #define PFKEYV2_CHUNK sizeof(u_int64_t)
     65 static char *link_print(const struct sockaddr *);
     66 
     67 /*
     68  * Definitions for showing gateway flags.
     69  */
     70 struct bits {
     71 	int	b_mask;
     72 	char	b_val;
     73 };
     74 static const struct bits bits[] = {
     75 	{ RTF_UP,	'U' },
     76 	{ RTF_GATEWAY,	'G' },
     77 	{ RTF_HOST,	'H' },
     78 	{ RTF_REJECT,	'R' },
     79 	{ RTF_BLACKHOLE, 'B' },
     80 	{ RTF_DYNAMIC,	'D' },
     81 	{ RTF_MODIFIED,	'M' },
     82 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
     83 	{ RTF_MASK,	'm' }, /* Mask Present -- for routing messages only */
     84 	/* { RTF_CLONING,	'C' }, */
     85 	{ RTF_CONNECTED, 'C' },
     86 	/* { RTF_XRESOLVE,	'X' }, */
     87 	/* { RTF_LLINFO,	'L' }, */
     88 	{ RTF_STATIC,	'S' },
     89 	{ RTF_PROTO1,	'1' },
     90 	{ RTF_PROTO2,	'2' },
     91 	/* { RTF_PROTO3,	'3' }, */
     92 	/* { RTF_CLONED,	'c' }, */
     93 	/* { RTF_JUMBO,	'J' }, */
     94 	{ RTF_ANNOUNCE,	'p' },
     95 	{ RTF_LOCAL, 'l'},
     96 	{ RTF_BROADCAST, 'b'},
     97 	{ 0, 0 }
     98 };
     99 
    100 #ifndef SMALL
    101 static void p_tag(const struct sockaddr *sa);
    102 #endif
    103 static void p_rtentry(struct rt_msghdr *, int, int);
    104 
    105 /*
    106  * Print routing tables.
    107  */
    108 void
    109 p_rttables(int paf, int flags, int pflags, int interesting)
    110 {
    111 	struct rt_msghdr *rtm;
    112 	char *buf = NULL, *next, *lim = NULL;
    113 	size_t needed;
    114 	int mib[6];
    115 	struct sockaddr *sa;
    116 
    117 	mib[0] = CTL_NET;
    118 	mib[1] = PF_ROUTE;
    119 	mib[2] = 0;
    120 	mib[3] = paf;
    121 	mib[4] = NET_RT_DUMP;
    122 	mib[5] = 0;
    123 	if (prog_sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)
    124 		err(1, "route-sysctl-estimate");
    125 	if (needed > 0) {
    126 		if ((buf = malloc(needed)) == 0)
    127 			err(1, NULL);
    128 		if (prog_sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
    129 			err(1, "sysctl of routing table");
    130 		lim = buf + needed;
    131 	}
    132 
    133 	printf("Routing tables\n");
    134 
    135 	if (buf) {
    136 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
    137 			rtm = (struct rt_msghdr *)next;
    138 			sa = (struct sockaddr *)(rtm + 1);
    139 			if ((rtm->rtm_flags & pflags) != pflags)
    140 				continue;
    141 			if (paf != AF_UNSPEC && sa->sa_family != paf)
    142 				continue;
    143 			p_rtentry(rtm, flags, interesting);
    144 		}
    145 		free(buf);
    146 		buf = NULL;
    147 	}
    148 
    149 	if (paf != 0 && paf != PF_KEY)
    150 		return;
    151 
    152 #if 0 /* XXX-elad */
    153 	mib[0] = CTL_NET;
    154 	mib[1] = PF_KEY;
    155 	mib[2] = PF_KEY_V2;
    156 	mib[3] = NET_KEY_SPD_DUMP;
    157 	mib[4] = mib[5] = 0;
    158 
    159 	if (prog_sysctl(mib, 4, NULL, &needed, NULL, 0) == -1) {
    160 		if (errno == ENOPROTOOPT)
    161 			return;
    162 		err(1, "spd-sysctl-estimate");
    163 	}
    164 	if (needed > 0) {
    165 		if ((buf = malloc(needed)) == 0)
    166 			err(1, NULL);
    167 		if (prog_sysctl(mib, 4, buf, &needed, NULL, 0) == -1)
    168 			err(1,"sysctl of spd");
    169 		lim = buf + needed;
    170 	}
    171 
    172 	if (buf) {
    173 		printf("\nEncap:\n");
    174 
    175 		for (next = buf; next < lim; next += msg->sadb_msg_len *
    176 		    PFKEYV2_CHUNK) {
    177 			msg = (struct sadb_msg *)next;
    178 			if (msg->sadb_msg_len == 0)
    179 				break;
    180 			p_pfkentry(msg);
    181 		}
    182 		free(buf);
    183 		buf = NULL;
    184 	}
    185 #endif /* 0 */
    186 }
    187 
    188 /*
    189  * column widths; each followed by one space
    190  * width of destination/gateway column
    191  * strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4 = 34
    192  * strlen("aaaa:bbbb:cccc:dddd:eeee:ffff:gggg:hhhh") == 39
    193  */
    194 #ifndef INET6
    195 #define	WID_DST(af)	18	/* width of destination column */
    196 #define	WID_GW(af)	18	/* width of gateway column */
    197 #else
    198 #define	WID_DST(af)	((af) == AF_INET6 ? ((flags & RT_NFLAG) ? 39 : 18) : 18)
    199 #define	WID_GW(af)	((af) == AF_INET6 ? ((flags & RT_NFLAG) ? 30 : 18) : 18)
    200 #endif
    201 
    202 /*
    203  * Print header for routing table columns.
    204  */
    205 void
    206 p_rthdr(int paf, int flags)
    207 {
    208 #ifndef SMALL
    209 	if (flags & RT_AFLAG)
    210 		printf("%-*.*s ", PLEN, PLEN, "Address");
    211 	if (paf == PF_KEY) {
    212 		printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
    213 		    "Source", "Port", "Destination",
    214 		    "Port", "Proto", "SA(Address/Proto/Type/Direction)");
    215 		return;
    216 	}
    217 	if (flags & RT_TFLAG) {
    218 	    printf("%-*.*s %-*.*s %-6.6s %6.6s %8.8s %6.6s %7.7s"
    219 		" %s\n", WID_DST(paf), WID_DST(paf), "Destination",
    220 		WID_GW(paf), WID_GW(paf), "Gateway",
    221 		"Flags", "Refs", "Use", "Mtu", "Tag", "Interface");
    222 	    return;
    223 	}
    224 #endif
    225 #ifndef SMALL
    226 	printf("%-*.*s %-*.*s %-6.6s %6.6s %8.8s %6.6s %s\n",
    227 	    WID_DST(paf), WID_DST(paf), "Destination",
    228 	    WID_GW(paf), WID_GW(paf), "Gateway",
    229 	    "Flags", "Refs", "Use", "Mtu", "Interface");
    230 #else
    231 	printf("%-*.*s %-*.*s %-6.6s\n",
    232 	    WID_DST(paf), WID_DST(paf), "Destination",
    233 	    WID_GW(paf), WID_GW(paf), "Gateway",
    234 	    "Flags");
    235 #endif
    236 }
    237 
    238 static void
    239 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
    240 {
    241 	int	i;
    242 
    243 	for (i = 0; i < RTAX_MAX; i++) {
    244 		if (addrs & (1 << i)) {
    245 			rti_info[i] = sa;
    246 			sa = (struct sockaddr *)((char *)(sa) +
    247 			    RT_ROUNDUP(sa->sa_len));
    248 		} else
    249 			rti_info[i] = NULL;
    250 	}
    251 }
    252 
    253 /*
    254  * Print a routing table entry.
    255  */
    256 static void
    257 p_rtentry(struct rt_msghdr *rtm, int flags, int interesting)
    258 {
    259 	static int	 old_af = -1;
    260 	struct sockaddr	*sa = (struct sockaddr *)(rtm + 1);
    261 	struct sockaddr	*mask, *rti_info[RTAX_MAX];
    262 #ifndef SMALL
    263 	char		 ifbuf[IF_NAMESIZE];
    264 #endif
    265 
    266 	if (old_af != sa->sa_family) {
    267 		old_af = sa->sa_family;
    268 		p_family(sa->sa_family);
    269 		p_rthdr(sa->sa_family, flags);
    270 	}
    271 	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
    272 
    273 	mask = rti_info[RTAX_NETMASK];
    274 	if ((sa = rti_info[RTAX_DST]) == NULL)
    275 		return;
    276 
    277 	p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family), flags);
    278 	p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
    279 	    WID_GW(sa->sa_family), flags);
    280 	p_flags(rtm->rtm_flags & interesting);
    281 #if 0 /* XXX-elad */
    282 	printf("%6d %8"PRId64" ", (int)rtm->rtm_rmx.rmx_refcnt,
    283 	    rtm->rtm_rmx.rmx_pksent);
    284 #else
    285 	printf("%6s %8s ", "-", "-");
    286 #endif
    287 #ifndef SMALL
    288 	if (rtm->rtm_rmx.rmx_mtu)
    289 		printf("%6"PRId64, rtm->rtm_rmx.rmx_mtu);
    290 	else
    291 		printf("%6s", "-");
    292 	putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
    293 	if (flags & RT_TFLAG)
    294 		p_tag(rti_info[RTAX_TAG]);
    295 	printf(" %.16s", if_indextoname(rtm->rtm_index, ifbuf));
    296 	putchar('\n');
    297 	if (flags & RT_VFLAG)
    298 		p_rtrmx(&rtm->rtm_rmx);
    299 #endif
    300 }
    301 
    302 /*
    303  * Print address family header before a section of the routing table.
    304  */
    305 void
    306 p_family(int paf)
    307 {
    308 	const char *afname;
    309 
    310 	switch (paf) {
    311 	case AF_INET:
    312 		afname = "Internet";
    313 		break;
    314 #ifdef INET6
    315 	case AF_INET6:
    316 		afname = "Internet6";
    317 		break;
    318 #endif
    319 	case PF_KEY:
    320 		afname = "Encap";
    321 		break;
    322 	case AF_APPLETALK:
    323 		afname = "AppleTalk";
    324 		break;
    325 #ifndef SMALL
    326 	case AF_MPLS:
    327 		afname = "MPLS";
    328 		break;
    329 #endif
    330 	default:
    331 		afname = NULL;
    332 		break;
    333 	}
    334 	if (afname)
    335 		printf("\n%s:\n", afname);
    336 	else
    337 		printf("\nProtocol Family %d:\n", paf);
    338 }
    339 
    340 void
    341 p_sockaddr(const struct sockaddr *sa, const struct sockaddr *mask, int rflags,
    342     int width, int flags)
    343 {
    344 	char *cp;
    345 
    346 	switch (sa->sa_family) {
    347 #ifdef INET6
    348 	case AF_INET6:
    349 	    {
    350 		struct sockaddr_in6 sa6 = *(const struct sockaddr_in6 *)sa;
    351 
    352 		inet6_getscopeid(&sa6, INET6_IS_ADDR_LINKLOCAL|
    353 		    INET6_IS_ADDR_MC_LINKLOCAL);
    354 		if (rflags & RTF_HOST)
    355 			cp = routename((const struct sockaddr *)&sa6, flags);
    356 		else
    357 			cp = netname((const struct sockaddr *)&sa6, mask, flags);
    358 		break;
    359 	    }
    360 #endif
    361 	default:
    362 		if ((rflags & RTF_HOST) || mask == NULL)
    363 			cp = routename(sa, flags);
    364 		else
    365 			cp = netname(sa, mask, flags);
    366 		break;
    367 	}
    368 	if (width < 0)
    369 		printf("%s", cp);
    370 	else {
    371 		if (flags & RT_NFLAG)
    372 			printf("%-*s ", width, cp);
    373 		else
    374 			printf("%-*.*s ", width, width, cp);
    375 	}
    376 }
    377 
    378 void
    379 p_flags(int f)
    380 {
    381 	char name[33], *flags;
    382 	const struct bits *p = bits;
    383 
    384 	for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
    385 		if (p->b_mask & f)
    386 			*flags++ = p->b_val;
    387 	*flags = '\0';
    388 	printf("%-6.6s ", name);
    389 }
    390 
    391 #ifndef SMALL
    392 void
    393 p_rtrmx(const struct rt_metrics *rmx)
    394 {
    395 	printf("\texpire   %10"PRId64"%c  recvpipe %10"PRIu64"%c  "
    396 	    "sendpipe %10"PRIu64"%c\n",
    397 	    (int64_t)rmx->rmx_expire,
    398 	    (rmx->rmx_locks & RTV_EXPIRE) ? 'L' : ' ', rmx->rmx_recvpipe,
    399 	    (rmx->rmx_locks & RTV_RPIPE) ? 'L' : ' ', rmx->rmx_sendpipe,
    400 	    (rmx->rmx_locks & RTV_SPIPE) ? 'L' : ' ');
    401 	printf("\tssthresh %10"PRIu64"%c  rtt      %10"PRIu64"%c  "
    402 	    "rttvar   %10"PRIu64"%c\n", rmx->rmx_ssthresh,
    403 	    (rmx->rmx_locks & RTV_SSTHRESH) ? 'L' : ' ',
    404 	    rmx->rmx_rtt, (rmx->rmx_locks & RTV_RTT) ? 'L' : ' ',
    405 	    rmx->rmx_rttvar, (rmx->rmx_locks & RTV_RTTVAR) ? 'L' : ' ');
    406 	printf("\thopcount %10"PRIu64"%c\n",
    407 	    rmx->rmx_hopcount, (rmx->rmx_locks & RTV_HOPCOUNT) ? 'L' : ' ');
    408 }
    409 
    410 static void
    411 p_tag(const struct sockaddr *sa)
    412 {
    413 	char *line;
    414 
    415 	if (sa == NULL || sa->sa_family != AF_MPLS) {
    416 		printf("%7s", "-");
    417 		return;
    418 	}
    419 	line = mpls_ntoa(sa);
    420 	if (strlen(line) < 7)
    421 		printf("%7s", line);
    422 	else
    423 		printf("%s", line);
    424 }
    425 #endif
    426 
    427 static char line[MAXHOSTNAMELEN];
    428 static char domain[MAXHOSTNAMELEN];
    429 
    430 char *
    431 routename(const struct sockaddr *sa, int flags)
    432 {
    433 	char *cp = NULL;
    434 	static int first = 1;
    435 
    436 	if (first) {
    437 		first = 0;
    438 		if (gethostname(domain, sizeof(domain)) == 0 &&
    439 		    (cp = strchr(domain, '.')))
    440 			(void)strlcpy(domain, cp + 1, sizeof(domain));
    441 		else
    442 			domain[0] = '\0';
    443 		cp = NULL;
    444 	}
    445 
    446 	if (sa->sa_len == 0) {
    447 		(void)strlcpy(line, "default", sizeof(line));
    448 		return (line);
    449 	}
    450 
    451 	switch (sa->sa_family) {
    452 	case AF_INET:
    453 		return routename4(
    454 		    ((const struct sockaddr_in *)sa)->sin_addr.s_addr,
    455 		    flags);
    456 #ifdef INET6
    457 	case AF_INET6:
    458 	    {
    459 		struct sockaddr_in6 sin6;
    460 
    461 		memset(&sin6, 0, sizeof(sin6));
    462 		memcpy(&sin6, sa, sa->sa_len);
    463 		sin6.sin6_len = sizeof(struct sockaddr_in6);
    464 		sin6.sin6_family = AF_INET6;
    465 		if (sa->sa_len == sizeof(struct sockaddr_in6))
    466 			inet6_getscopeid(&sin6, INET6_IS_ADDR_LINKLOCAL|
    467 			    INET6_IS_ADDR_MC_LINKLOCAL);
    468 		return routename6(&sin6, flags);
    469 	    }
    470 #endif
    471 	case AF_LINK:
    472 		return link_print(sa);
    473 
    474 #ifndef SMALL
    475 	case AF_MPLS:
    476 		return mpls_ntoa(sa);
    477 
    478 	case AF_APPLETALK:
    479 		(void)snprintf(line, sizeof(line), "atalk %d.%d",
    480 		    ((const struct sockaddr_at *)sa)->sat_addr.s_net,
    481 		    ((const struct sockaddr_at *)sa)->sat_addr.s_node);
    482 		break;
    483 #endif
    484 
    485 #if 0 /* XXX-elad */
    486 	case AF_UNSPEC:
    487 		if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
    488 			static char name[RTLABEL_LEN];
    489 			struct sockaddr_rtlabel *sr;
    490 
    491 			sr = (struct sockaddr_rtlabel *)sa;
    492 			strlcpy(name, sr->sr_label, sizeof(name));
    493 			return (name);
    494 		}
    495 		/* FALLTHROUGH */
    496 #endif
    497 	default:
    498 		(void)snprintf(line, sizeof(line), "(%d) %s",
    499 		    sa->sa_family, any_ntoa(sa));
    500 		break;
    501 	}
    502 	return (line);
    503 }
    504 
    505 char *
    506 routename4(in_addr_t in, int flags)
    507 {
    508 	const char	*cp = NULL;
    509 	struct in_addr	 ina;
    510 	struct hostent	*hp;
    511 
    512 	if (in == INADDR_ANY)
    513 		cp = "default";
    514 	if (!cp && (flags & RT_NFLAG) == 0) {
    515 		if ((hp = gethostbyaddr((char *)&in,
    516 		    sizeof(in), AF_INET)) != NULL) {
    517 			char *p;
    518 			if ((p = strchr(hp->h_name, '.')) &&
    519 			    !strcmp(p + 1, domain))
    520 				*p = '\0';
    521 			cp = hp->h_name;
    522 		}
    523 	}
    524 	ina.s_addr = in;
    525 	strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));
    526 
    527 	return (line);
    528 }
    529 
    530 #ifdef INET6
    531 char *
    532 routename6(const struct sockaddr_in6 *sin6, int flags)
    533 {
    534 	int	 niflags = 0;
    535 
    536 	if ((flags & RT_NFLAG))
    537 		niflags |= NI_NUMERICHOST;
    538 	else
    539 		niflags |= NI_NOFQDN;
    540 
    541 	if (getnameinfo((const struct sockaddr *)sin6, sin6->sin6_len,
    542 	    line, sizeof(line), NULL, 0, niflags) != 0)
    543 		strncpy(line, "invalid", sizeof(line));
    544 
    545 	return (line);
    546 }
    547 #endif
    548 
    549 /*
    550  * Return the name of the network whose address is given.
    551  * The address is assumed to be that of a net or subnet, not a host.
    552  */
    553 char *
    554 netname4(const struct sockaddr_in* sa4, const struct sockaddr_in *mask, int flags)
    555 {
    556 	const char *cp = NULL;
    557 	struct netent *np = NULL;
    558 	int mbits;
    559 	in_addr_t in = sa4->sin_addr.s_addr;
    560 
    561 	if (mask) {
    562 		in_addr_t m = mask->sin_addr.s_addr ;
    563 		m = ntohl(m);
    564 		mbits = m ? 33 - ffs(m) : 0;
    565 	} else
    566 		mbits = 0;
    567 
    568 	in = ntohl(in);
    569 	if (in == INADDR_ANY && !mbits)
    570 		cp = "default";
    571 	else if (!(flags & RT_NFLAG) && in != INADDR_ANY) {
    572 		if ((np = getnetbyaddr(in, AF_INET)) != NULL)
    573 			cp = np->n_name;
    574 	}
    575 	if (cp)
    576 		strlcpy(line, cp, sizeof(line));
    577 #define C(x)	((x) & 0xff)
    578 	else if (mbits < 9)
    579 		snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
    580 	else if (mbits < 17)
    581 		snprintf(line, sizeof(line), "%u.%u/%d",
    582 		    C(in >> 24) , C(in >> 16), mbits);
    583 	else if (mbits < 25)
    584 		snprintf(line, sizeof(line), "%u.%u.%u/%d",
    585 		    C(in >> 24), C(in >> 16), C(in >> 8), mbits);
    586 	else
    587 		snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
    588 		    C(in >> 16), C(in >> 8), C(in), mbits);
    589 #undef C
    590 	return line;
    591 }
    592 
    593 #ifdef INET6
    594 char *
    595 netname6(const struct sockaddr_in6 *sa6, const struct sockaddr_in6 *mask, int flags)
    596 {
    597 	struct sockaddr_in6 sin6;
    598 	const u_char *p;
    599 	int masklen, final = 0, illegal = 0;
    600 	int i, lim, flag, error;
    601 	char hbuf[NI_MAXHOST];
    602 
    603 	sin6 = *sa6;
    604 
    605 	flag = 0;
    606 	masklen = 0;
    607 	if (mask) {
    608 		lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
    609 		if (lim < 0)
    610 			lim = 0;
    611 		else if (lim > (int)sizeof(struct in6_addr))
    612 			lim = sizeof(struct in6_addr);
    613 		for (p = (const u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
    614 			if (final && *p) {
    615 				illegal++;
    616 				sin6.sin6_addr.s6_addr[i++] = 0x00;
    617 				continue;
    618 			}
    619 
    620 			switch (*p & 0xff) {
    621 			case 0xff:
    622 				masklen += 8;
    623 				break;
    624 			case 0xfe:
    625 				masklen += 7;
    626 				final++;
    627 				break;
    628 			case 0xfc:
    629 				masklen += 6;
    630 				final++;
    631 				break;
    632 			case 0xf8:
    633 				masklen += 5;
    634 				final++;
    635 				break;
    636 			case 0xf0:
    637 				masklen += 4;
    638 				final++;
    639 				break;
    640 			case 0xe0:
    641 				masklen += 3;
    642 				final++;
    643 				break;
    644 			case 0xc0:
    645 				masklen += 2;
    646 				final++;
    647 				break;
    648 			case 0x80:
    649 				masklen += 1;
    650 				final++;
    651 				break;
    652 			case 0x00:
    653 				final++;
    654 				break;
    655 			default:
    656 				final++;
    657 				illegal++;
    658 				break;
    659 			}
    660 
    661 			if (!illegal)
    662 				sin6.sin6_addr.s6_addr[i++] &= *p;
    663 			else
    664 				sin6.sin6_addr.s6_addr[i++] = 0x00;
    665 		}
    666 		while (i < (int)sizeof(struct in6_addr))
    667 			sin6.sin6_addr.s6_addr[i++] = 0x00;
    668 	} else
    669 		masklen = 128;
    670 
    671 	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr)) {
    672 		snprintf(line, sizeof(line), "default");
    673 		return (line);
    674 	}
    675 
    676 	if (illegal)
    677 		warnx("illegal prefixlen");
    678 
    679 	if (flags & RT_NFLAG)
    680 		flag |= NI_NUMERICHOST;
    681 	error = getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
    682 	    hbuf, sizeof(hbuf), NULL, 0, flag);
    683 	if (error)
    684 		snprintf(hbuf, sizeof(hbuf), "invalid");
    685 
    686 	snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
    687 	return (line);
    688 }
    689 #endif
    690 
    691 /*
    692  * Return the name of the network whose address is given.
    693  * The address is assumed to be that of a net or subnet, not a host.
    694  */
    695 char *
    696 netname(const struct sockaddr *sa, const struct sockaddr *mask, int flags)
    697 {
    698 	switch (sa->sa_family) {
    699 
    700 	case AF_INET:
    701 		return netname4((const struct sockaddr_in *)sa,
    702 		    (const struct sockaddr_in *)mask, flags);
    703 #ifdef INET6
    704 	case AF_INET6:
    705 		return netname6((const struct sockaddr_in6 *)sa,
    706 		    (const struct sockaddr_in6 *)mask, flags);
    707 #endif
    708 	case AF_LINK:
    709 		return link_print(sa);
    710 	default:
    711 		snprintf(line, sizeof(line), "af %d: %s",
    712 		    sa->sa_family, any_ntoa(sa));
    713 		break;
    714 	}
    715 	return (line);
    716 }
    717 
    718 static const char hexlist[] = "0123456789abcdef";
    719 
    720 char *
    721 any_ntoa(const struct sockaddr *sa)
    722 {
    723 	static char obuf[240];
    724 	const char *in = sa->sa_data;
    725 	char *out = obuf;
    726 	int len = sa->sa_len - offsetof(struct sockaddr, sa_data);
    727 
    728 	*out++ = 'Q';
    729 	do {
    730 		*out++ = hexlist[(*in >> 4) & 15];
    731 		*out++ = hexlist[(*in++)    & 15];
    732 		*out++ = '.';
    733 	} while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
    734 	out[-1] = '\0';
    735 	return (obuf);
    736 }
    737 
    738 static char *
    739 link_print(const struct sockaddr *sa)
    740 {
    741 	const struct sockaddr_dl *sdl = (const struct sockaddr_dl *)sa;
    742 	const u_char *lla = (const u_char *)sdl->sdl_data + sdl->sdl_nlen;
    743 
    744 	if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
    745 	    sdl->sdl_slen == 0) {
    746 		(void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
    747 		return (line);
    748 	}
    749 	switch (sdl->sdl_type) {
    750 	case IFT_ETHER:
    751 	case IFT_CARP:
    752 		return ether_ntoa((const struct ether_addr *)lla);
    753 	default:
    754 		return link_ntoa(sdl);
    755 	}
    756 }
    757 
    758 #ifndef SMALL
    759 char *
    760 mpls_ntoa(const struct sockaddr *sa)
    761 {
    762 	static char obuf[16];
    763 	size_t olen;
    764 	const union mpls_shim *pms;
    765 	union mpls_shim ms;
    766 	int psize = sizeof(struct sockaddr_mpls);
    767 
    768 	pms = &((const struct sockaddr_mpls*)sa)->smpls_addr;
    769 	ms.s_addr = ntohl(pms->s_addr);
    770 
    771 	snprintf(obuf, sizeof(obuf), "%u", ms.shim.label);
    772 
    773 	while(psize < sa->sa_len) {
    774 		pms++;
    775 		ms.s_addr = ntohl(pms->s_addr);
    776 		olen = strlen(obuf);
    777 		snprintf(obuf + olen, sizeof(obuf) - olen, ",%u",
    778 		    ms.shim.label);
    779 		psize+=sizeof(ms);
    780 	}
    781 	return obuf;
    782 }
    783 #endif
    784 
    785 void
    786 p_addr(const struct sockaddr *sa, const struct sockaddr *mask, int rflags, int flags)
    787 {
    788 	p_sockaddr(sa, mask, rflags, WID_DST(sa->sa_family), flags);
    789 }
    790 
    791 void
    792 p_gwaddr(const struct sockaddr *sa, int gwaf, int flags)
    793 {
    794 	p_sockaddr(sa, 0, RTF_HOST, WID_GW(gwaf), flags);
    795 }
    796