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show.c revision 1.10 
      1 /*	$NetBSD: show.c,v 1.10 1999/07/12 20:46:15 itojun Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "from: @(#)route.c	8.3 (Berkeley) 3/9/94";
     40 #else
     41 __RCSID("$NetBSD: show.c,v 1.10 1999/07/12 20:46:15 itojun Exp $");
     42 #endif
     43 #endif /* not lint */
     44 
     45 #include <sys/param.h>
     46 #include <sys/protosw.h>
     47 #include <sys/socket.h>
     48 #include <sys/mbuf.h>
     49 
     50 #include <net/if.h>
     51 #include <net/if_dl.h>
     52 #include <net/if_types.h>
     53 #include <net/route.h>
     54 #include <netinet/in.h>
     55 #include <netns/ns.h>
     56 
     57 #include <sys/sysctl.h>
     58 
     59 #include <netdb.h>
     60 #include <stdio.h>
     61 #include <stdlib.h>
     62 #include <string.h>
     63 #include <unistd.h>
     64 #include <err.h>
     65 
     66 #include "extern.h"
     67 
     68 /*
     69  * Definitions for showing gateway flags.
     70  */
     71 struct bits {
     72 	short	b_mask;
     73 	char	b_val;
     74 };
     75 static const struct bits bits[] = {
     76 	{ RTF_UP,	'U' },
     77 	{ RTF_GATEWAY,	'G' },
     78 	{ RTF_HOST,	'H' },
     79 	{ RTF_REJECT,	'R' },
     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_XRESOLVE,	'X' },
     86 	{ RTF_LLINFO,	'L' },
     87 	{ RTF_STATIC,	'S' },
     88 	{ RTF_PROTO1,	'1' },
     89 	{ RTF_PROTO2,	'2' },
     90 	{ 0 }
     91 };
     92 
     93 static void pr_rthdr __P((void));
     94 static void p_rtentry __P((struct rt_msghdr *));
     95 static void pr_family __P((int));
     96 static void p_sockaddr __P((struct sockaddr *, int, int ));
     97 static void p_flags __P((int, char *));
     98 
     99 /*
    100  * Print routing tables.
    101  */
    102 void
    103 show(argc, argv)
    104 	int argc;
    105 	char **argv;
    106 {
    107 	size_t needed;
    108 	int mib[6];
    109 	char *buf, *next, *lim;
    110 	struct rt_msghdr *rtm;
    111 
    112 	mib[0] = CTL_NET;
    113 	mib[1] = PF_ROUTE;
    114 	mib[2] = 0;
    115 	mib[3] = 0;
    116 	mib[4] = NET_RT_DUMP;
    117 	mib[5] = 0;
    118 	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)	{
    119 		perror("route-sysctl-estimate");
    120 		exit(1);
    121 	}
    122 	if ((buf = malloc(needed)) == 0)
    123 		err(1, "%s", "");
    124 	if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
    125 		err(1, "sysctl of routing table");
    126 	lim  = buf + needed;
    127 
    128 	printf("Routing tables\n");
    129 
    130 	/* for (i = 0; i <= AF_MAX; i++) ??? */
    131 	{
    132 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
    133 			rtm = (struct rt_msghdr *)next;
    134 			p_rtentry(rtm);
    135 		}
    136 	}
    137 }
    138 
    139 
    140 /* column widths; each followed by one space */
    141 #define	WID_DST		16	/* width of destination column */
    142 #define	WID_GW		18	/* width of gateway column */
    143 
    144 /*
    145  * Print header for routing table columns.
    146  */
    147 static void
    148 pr_rthdr()
    149 {
    150 
    151 	printf("%-*.*s %-*.*s %-6.6s\n",
    152 		WID_DST, WID_DST, "Destination",
    153 		WID_GW, WID_GW, "Gateway",
    154 		"Flags");
    155 }
    156 
    157 
    158 /*
    159  * Print a routing table entry.
    160  */
    161 static void
    162 p_rtentry(rtm)
    163 	struct rt_msghdr *rtm;
    164 {
    165 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
    166 #ifdef notdef
    167 	static int masks_done, banner_printed;
    168 #endif
    169 	static int old_af;
    170 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
    171 
    172 #ifdef notdef
    173 	/* for the moment, netmasks are skipped over */
    174 	if (!banner_printed) {
    175 		printf("Netmasks:\n");
    176 		banner_printed = 1;
    177 	}
    178 	if (masks_done == 0) {
    179 		if (rtm->rtm_addrs != RTA_DST ) {
    180 			masks_done = 1;
    181 			af = sa->sa_family;
    182 		}
    183 	} else
    184 #endif
    185 		af = sa->sa_family;
    186 	if (old_af != af) {
    187 		old_af = af;
    188 		pr_family(af);
    189 		pr_rthdr();
    190 	}
    191 	if (rtm->rtm_addrs == RTA_DST)
    192 		p_sockaddr(sa, 0, WID_DST + 1 + WID_GW + 1);
    193 	else {
    194 		p_sockaddr(sa, rtm->rtm_flags, WID_DST);
    195 		if (sa->sa_len == 0)
    196 			sa->sa_len = sizeof(long);
    197 		sa = (struct sockaddr *)(sa->sa_len + (char *)sa);
    198 		p_sockaddr(sa, 0, WID_GW);
    199 	}
    200 	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
    201 	putchar('\n');
    202 }
    203 
    204 
    205 /*
    206  * Print address family header before a section of the routing table.
    207  */
    208 static void
    209 pr_family(af)
    210 	int af;
    211 {
    212 	char *afname;
    213 
    214 	switch (af) {
    215 	case AF_INET:
    216 		afname = "Internet";
    217 		break;
    218 #ifndef SMALL
    219 #ifdef INET6
    220 	case AF_INET6:
    221 		afname = "Internet6";
    222 		break;
    223 #endif /* INET6 */
    224 	case AF_NS:
    225 		afname = "XNS";
    226 		break;
    227 	case AF_ISO:
    228 		afname = "ISO";
    229 		break;
    230 	case AF_CCITT:
    231 		afname = "X.25";
    232 		break;
    233 #endif /* SMALL */
    234 	case AF_APPLETALK:
    235 		afname = "AppleTalk";
    236 		break;
    237 	default:
    238 		afname = NULL;
    239 		break;
    240 	}
    241 	if (afname)
    242 		printf("\n%s:\n", afname);
    243 	else
    244 		printf("\nProtocol Family %d:\n", af);
    245 }
    246 
    247 
    248 static void
    249 p_sockaddr(sa, flags, width)
    250 	struct sockaddr *sa;
    251 	int flags, width;
    252 {
    253 	char workbuf[128], *cplim;
    254 	char *cp = workbuf;
    255 	int cplen = 0, len;
    256 
    257 	switch(sa->sa_family) {
    258 
    259 	case AF_LINK:
    260 	    {
    261 		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
    262 
    263 		if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
    264 		    sdl->sdl_slen == 0)
    265 			(void)snprintf(workbuf, sizeof workbuf, "link#%d",
    266 			    sdl->sdl_index);
    267 		else switch (sdl->sdl_type) {
    268 		case IFT_ETHER:
    269 		    {
    270 			int i;
    271 			u_char *lla = (u_char *)sdl->sdl_data +
    272 			    sdl->sdl_nlen;
    273 
    274 			cplim = "";
    275 			for (i = 0; i < sdl->sdl_alen; i++, lla++) {
    276 				len = snprintf(cp, sizeof(workbuf) - cplen,
    277 				    "%s%x", cplim, *lla);
    278 				cp += len;
    279 				cplen += len;
    280 				cplim = ":";
    281 			}
    282 			cp = workbuf;
    283 			break;
    284 		    }
    285 		default:
    286 			cp = link_ntoa(sdl);
    287 			break;
    288 		}
    289 		break;
    290 	    }
    291 
    292 	case AF_INET:
    293 	    {
    294 		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
    295 
    296 		cp = (sin->sin_addr.s_addr == 0) ? "default" :
    297 			((flags & RTF_HOST) ?
    298 			routename(sa) :	netname(sa));
    299 		break;
    300 	    }
    301 
    302 #ifndef SMALL
    303 #ifdef INET6
    304 	case AF_INET6:
    305 	    {
    306 		struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa;
    307 
    308 		cp = (sin->sin6_addr.s6_addr32[0] == 0 &&
    309 		      sin->sin6_addr.s6_addr32[1] == 0 &&
    310 		      sin->sin6_addr.s6_addr32[2] == 0 &&
    311 		      sin->sin6_addr.s6_addr32[3] == 0) ? "default" :
    312 			((flags & RTF_HOST) ?
    313 			routename(sa) :	netname(sa));
    314 		break;
    315 	    }
    316 #endif /* INET6 */
    317 
    318 	case AF_NS:
    319 		cp = ns_print((struct sockaddr_ns *)sa);
    320 		break;
    321 #endif /* SMALL */
    322 
    323 	default:
    324 	    {
    325 		u_char *s = (u_char *)sa->sa_data, *slim;
    326 
    327 		slim = sa->sa_len + (u_char *) sa;
    328 		cplim = cp + sizeof(workbuf) - 6;
    329 		cp += snprintf(cp, cplim - cp, "(%d)", sa->sa_family);
    330 		while (s < slim && cp < cplim) {
    331 			cp += snprintf(cp, cplim - cp, " %02x", *s++);
    332 			if (s < slim)
    333 			    cp += snprintf(cp, cplim - cp, "%02x", *s++);
    334 		}
    335 		cp = workbuf;
    336 	    }
    337 	}
    338 	if (width < 0 )
    339 		printf("%s ", cp);
    340 	else {
    341 		if (nflag)
    342 			printf("%-*s ", width, cp);
    343 		else
    344 			printf("%-*.*s ", width, width, cp);
    345 	}
    346 }
    347 
    348 static void
    349 p_flags(f, format)
    350 	int f;
    351 	char *format;
    352 {
    353 	char name[33], *flags;
    354 	const struct bits *p = bits;
    355 
    356 	for (flags = name; p->b_mask; p++)
    357 		if (p->b_mask & f)
    358 			*flags++ = p->b_val;
    359 	*flags = '\0';
    360 	printf(format, name);
    361 }
    362 
    363