xref: /dragonfly/sbin/route/show.c (revision 92fc8b5c) 
1 /*
2  * $OpenBSD: show.c,v 1.26 2003/08/26 08:33:12 itojun Exp $
3  * $NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $
4  * $DragonFly: src/sbin/route/show.c,v 1.6 2006/01/19 22:19:30 dillon Exp $
5  */
6 /*
7  * Copyright (c) 1983, 1988, 1993
8  *	The Regents of the University of California.  All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
15  * 2. Redistributions in binary form must reproduce the above copyright
16  *    notice, this list of conditions and the following disclaimer in the
17  *    documentation and/or other materials provided with the distribution.
18  * 3. Neither the name of the University nor the names of its contributors
19  *    may be used to endorse or promote products derived from this software
20  *    without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #include <sys/param.h>
36 #include <sys/protosw.h>
37 #include <sys/socket.h>
38 #include <sys/mbuf.h>
39 
40 #include <net/if.h>
41 #include <net/if_dl.h>
42 #include <net/if_types.h>
43 #include <net/route.h>
44 #include <netinet/in.h>
45 #include <arpa/inet.h>
46 
47 #include <sys/sysctl.h>
48 
49 #include <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 
54 #include <netdb.h>
55 
56 #include "extern.h"
57 #include "keywords.h"
58 
59 #define ROUNDUP(a) \
60 	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
61 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
62 
63 /*
64  * Definitions for showing gateway flags.
65  */
66 struct bits {
67 	int	b_mask;
68 	char	b_val;
69 };
70 static const struct bits bits[] = {
71 	{ RTF_UP,	'U' },
72 	{ RTF_GATEWAY,	'G' },
73 	{ RTF_HOST,	'H' },
74 	{ RTF_REJECT,	'R' },
75 	{ RTF_BLACKHOLE, 'B' },
76 	{ RTF_DYNAMIC,	'D' },
77 	{ RTF_MODIFIED,	'M' },
78 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
79 	{ RTF_CLONING,	'C' },
80 	{ RTF_XRESOLVE,	'X' },
81 	{ RTF_LLINFO,	'L' },
82 	{ RTF_STATIC,	'S' },
83 	{ RTF_PROTO1,	'1' },
84 	{ RTF_PROTO2,	'2' },
85 	{ RTF_PROTO3,	'3' },
86 	{ 0, 0 }
87 };
88 
89 static void	p_rtentry(struct rt_msghdr *);
90 static int	p_sockaddr(struct sockaddr *, int, int);
91 static void	p_flags(int, const char *);
92 static void	pr_rthdr(void);
93 static void	pr_family(int);
94 
95 /*
96  * Print routing tables.
97  */
98 void
99 show(int argc, char *argv[])
100 {
101 	struct rt_msghdr *rtm;
102 	char *buf = NULL, *next, *lim = NULL;
103 	size_t needed;
104 	int mib[7], af = 0;
105 	int miblen;
106         struct sockaddr *sa;
107 
108         if (argc > 1) {
109                 argv++;
110                 if (argc == 2 && **argv == '-') {
111                     switch (keyword(*argv + 1)) {
112                         case K_INET:
113                                 af = AF_INET;
114                                 break;
115 #ifdef INET6
116                         case K_INET6:
117                                 af = AF_INET6;
118                                 break;
119 #endif
120                         case K_XNS:
121                                 af = AF_NS;
122                                 break;
123                         case K_LINK:
124                                 af = AF_LINK;
125                                 break;
126                         case K_ISO:
127                         case K_OSI:
128                                 af = AF_ISO;
129                                 break;
130                         case K_X25:
131                                 af = AF_CCITT;
132                                 break;
133                         default:
134                                 goto bad;
135 		    }
136                 } else
137 bad:                    usage(*argv);
138         }
139 	mib[0] = CTL_NET;
140 	mib[1] = PF_ROUTE;
141 	mib[2] = 0;
142 	mib[3] = 0;
143 	mib[4] = NET_RT_DUMP;
144 	mib[5] = 0;
145 	if (cpuflag >= 0) {
146 		mib[6] = cpuflag;
147 		miblen = 7;
148 	} else {
149 		miblen = 6;
150 	}
151 	if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)	{
152 		perror("route-sysctl-estimate");
153 		exit(1);
154 	}
155 	if (needed > 0) {
156 		if ((buf = malloc(needed)) == NULL) {
157 			printf("out of space\n");
158 			exit(1);
159 		}
160 		if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) {
161 			perror("sysctl of routing table");
162 			exit(1);
163 		}
164 		lim  = buf + needed;
165 	}
166 
167 	printf("Routing tables\n");
168 
169 	if (buf != NULL) {
170 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
171 			rtm = (struct rt_msghdr *)next;
172 			sa = (struct sockaddr *)(rtm + 1);
173 			if (af != 0 && sa->sa_family != af)
174 				continue;
175 			p_rtentry(rtm);
176 		}
177 		free(buf);
178 	}
179 }
180 
181 /* column widths; each followed by one space */
182 #define	WID_DST		(nflag ? 20 : 32)	/* destination column width */
183 #define	WID_GW		(nflag ? 20 : 32)	/* gateway column width */
184 
185 /*
186  * Print header for routing table columns.
187  */
188 static void
189 pr_rthdr(void)
190 {
191 	printf("%-*.*s %-*.*s %-6.6s\n",
192 	    WID_DST, WID_DST, "Destination",
193 	    WID_GW, WID_GW, "Gateway",
194 	    "Flags");
195 }
196 
197 /*
198  * Print a routing table entry.
199  */
200 static void
201 p_rtentry(struct rt_msghdr *rtm)
202 {
203 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
204 #ifdef notdef
205 	static int masks_done, banner_printed;
206 #endif
207 	static int old_af;
208 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
209 	int width;
210 
211 #ifdef notdef
212 	/* for the moment, netmasks are skipped over */
213 	if (!banner_printed) {
214 		printf("Netmasks:\n");
215 		banner_printed = 1;
216 	}
217 	if (masks_done == 0) {
218 		if (rtm->rtm_addrs != RTA_DST) {
219 			masks_done = 1;
220 			af = sa->sa_family;
221 		}
222 	} else
223 #endif
224 		af = sa->sa_family;
225 	if (old_af != af) {
226 		old_af = af;
227 		pr_family(af);
228 		pr_rthdr();
229 	}
230 
231 	/*
232 	 * Print the information.  If wflag is set p_sockaddr() can return
233 	 * a wider width then specified and we try to fit the second
234 	 * address in any remaining space so the flags still lines up.
235 	 */
236 	if (rtm->rtm_addrs == RTA_DST) {
237 		p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
238 	} else {
239 		width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
240 		sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
241 		p_sockaddr(sa, 0, WID_GW + WID_DST - width);
242 	}
243 	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
244 	putchar('\n');
245 }
246 
247 /*
248  * Print address family header before a section of the routing table.
249  */
250 static void
251 pr_family(int af)
252 {
253 	const char *afname;
254 
255 	switch (af) {
256 	case AF_INET:
257 		afname = "Internet";
258 		break;
259 #ifdef INET6
260 	case AF_INET6:
261 		afname = "Internet6";
262 		break;
263 #endif /* INET6 */
264 	case AF_NS:
265 		afname = "XNS";
266 		break;
267 	case AF_IPX:
268 		afname = "IPX";
269 		break;
270 	case AF_ISO:
271 		afname = "ISO";
272 		break;
273 	case AF_CCITT:
274 		afname = "X.25";
275 		break;
276 	case AF_APPLETALK:
277 		afname = "AppleTalk";
278 		break;
279 	default:
280 		afname = NULL;
281 		break;
282 	}
283 	if (afname != NULL)
284 		printf("\n%s:\n", afname);
285 	else
286 		printf("\nProtocol Family %d:\n", af);
287 }
288 
289 static int
290 p_sockaddr(struct sockaddr *sa, int flags, int width)
291 {
292 	char workbuf[128];
293 	char *cp = workbuf;
294 	const char *cplim;
295 	int len = sizeof(workbuf);
296 	int count;
297 
298 	switch(sa->sa_family) {
299 
300 	case AF_LINK:
301 	    {
302 		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
303 
304 		if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
305 		    sdl->sdl_slen == 0) {
306 			snprintf(workbuf, sizeof(workbuf),
307 			    "link#%d", sdl->sdl_index);
308 		} else {
309 			switch (sdl->sdl_type) {
310 			case IFT_ETHER:
311 			    {
312 				int i;
313 				u_char *lla = (u_char *)sdl->sdl_data +
314 				    sdl->sdl_nlen;
315 
316 				cplim = "";
317 				for (i = 0; i < sdl->sdl_alen; i++, lla++) {
318 					snprintf(cp, len, "%s%x", cplim, *lla);
319 					len -= strlen(cp);
320 					cp += strlen(cp);
321 					if (len <= 0)
322 						break;	/* overflow */
323 					cplim = ":";
324 				}
325 				cp = workbuf;
326 				break;
327 			    }
328 			default:
329 				cp = link_ntoa(sdl);
330 				break;
331 			}
332 		}
333 		break;
334 	    }
335 
336 	case AF_INET:
337 	    {
338 		struct sockaddr_in *in = (struct sockaddr_in *)sa;
339 
340 		if (in->sin_addr.s_addr == 0) {
341 			/* cp points to workbuf */
342 			strncpy(cp, "default", len);
343 		} else
344 			cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
345 		break;
346 	    }
347 
348 #ifdef INET6
349 	case AF_INET6:
350 	    {
351 		struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
352 
353 		if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
354 			/* cp points to workbuf */
355 			strncpy(cp, "default", len);
356 		} else {
357 			cp = ((flags & RTF_HOST) ? routename(sa)
358 						 : netname(sa));
359 		}
360 		/* make sure numeric address is not truncated */
361 		if (strchr(cp, ':') != NULL &&
362 		    (width < 0 || strlen(cp) > (size_t)width))
363 			width = strlen(cp);
364 		break;
365 	    }
366 #endif /* INET6 */
367 
368 	default:
369 	    {
370 		u_char *s = (u_char *)sa->sa_data, *slim;
371 
372 		slim =  sa->sa_len + (u_char *) sa;
373 		cplim = cp + sizeof(workbuf) - 6;
374 		snprintf(cp, len, "(%d)", sa->sa_family);
375 		len -= strlen(cp);
376 		cp += strlen(cp);
377 		if (len <= 0) {
378 			cp = workbuf;
379 			break;		/* overflow */
380 		}
381 		while (s < slim && cp < cplim) {
382 			snprintf(cp, len, " %02x", *s++);
383 			len -= strlen(cp);
384 			cp += strlen(cp);
385 			if (len <= 0)
386 				break;		/* overflow */
387 			if (s < slim) {
388 				snprintf(cp, len, "%02x", *s++);
389 				len -= strlen(cp);
390 				cp += strlen(cp);
391 				if (len <= 0)
392 					break;		/* overflow */
393 			}
394 		}
395 		cp = workbuf;
396 	    }
397 	}
398 	if (width < 0) {
399 		count = printf("%s ", cp);
400 	} else {
401 		if (nflag || wflag)
402 			count = printf("%-*s ", width, cp);
403 		else
404 			count = printf("%-*.*s ", width, width, cp);
405 	}
406 	return(count);
407 }
408 
409 static void
410 p_flags(int f, const char *format)
411 {
412 	char name[33], *flags;
413 	const struct bits *p = bits;
414 
415 	for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
416 		if (p->b_mask & f)
417 			*flags++ = p->b_val;
418 	}
419 	*flags = '\0';
420 	printf(format, name);
421 }
422