xref: /dragonfly/sbin/route/show.c (revision 19fe1c42) 
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 <netns/ns.h>
46 #include <arpa/inet.h>
47 
48 #include <sys/sysctl.h>
49 
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 
55 #include <netdb.h>
56 
57 #include "extern.h"
58 #include "keywords.h"
59 
60 #define ROUNDUP(a) \
61 	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
62 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
63 
64 /*
65  * Definitions for showing gateway flags.
66  */
67 struct bits {
68 	int	b_mask;
69 	char	b_val;
70 };
71 static const struct bits bits[] = {
72 	{ RTF_UP,	'U' },
73 	{ RTF_GATEWAY,	'G' },
74 	{ RTF_HOST,	'H' },
75 	{ RTF_REJECT,	'R' },
76 	{ RTF_BLACKHOLE, 'B' },
77 	{ RTF_DYNAMIC,	'D' },
78 	{ RTF_MODIFIED,	'M' },
79 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
80 	{ RTF_CLONING,	'C' },
81 	{ RTF_XRESOLVE,	'X' },
82 	{ RTF_LLINFO,	'L' },
83 	{ RTF_STATIC,	'S' },
84 	{ RTF_PROTO1,	'1' },
85 	{ RTF_PROTO2,	'2' },
86 	{ RTF_PROTO3,	'3' },
87 	{ 0, 0 }
88 };
89 
90 static void	p_rtentry(struct rt_msghdr *);
91 static int	p_sockaddr(struct sockaddr *, int, int);
92 static void	p_flags(int, const char *);
93 static void	pr_rthdr(void);
94 static void	pr_family(int);
95 
96 /*
97  * Print routing tables.
98  */
99 void
100 show(int argc, char *argv[])
101 {
102 	struct rt_msghdr *rtm;
103 	char *buf = NULL, *next, *lim = NULL;
104 	size_t needed;
105 	int mib[7], af = 0;
106 	int miblen;
107         struct sockaddr *sa;
108 
109         if (argc > 1) {
110                 argv++;
111                 if (argc == 2 && **argv == '-') {
112                     switch (keyword(*argv + 1)) {
113                         case K_INET:
114                                 af = AF_INET;
115                                 break;
116 #ifdef INET6
117                         case K_INET6:
118                                 af = AF_INET6;
119                                 break;
120 #endif
121                         case K_XNS:
122                                 af = AF_NS;
123                                 break;
124                         case K_LINK:
125                                 af = AF_LINK;
126                                 break;
127                         case K_ISO:
128                         case K_OSI:
129                                 af = AF_ISO;
130                                 break;
131                         case K_X25:
132                                 af = AF_CCITT;
133                                 break;
134                         default:
135                                 goto bad;
136 		    }
137                 } else
138 bad:                    usage(*argv);
139         }
140 	mib[0] = CTL_NET;
141 	mib[1] = PF_ROUTE;
142 	mib[2] = 0;
143 	mib[3] = 0;
144 	mib[4] = NET_RT_DUMP;
145 	mib[5] = 0;
146 	if (cpuflag >= 0) {
147 		mib[6] = cpuflag;
148 		miblen = 7;
149 	} else {
150 		miblen = 6;
151 	}
152 	if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)	{
153 		perror("route-sysctl-estimate");
154 		exit(1);
155 	}
156 	if (needed > 0) {
157 		if ((buf = malloc(needed)) == NULL) {
158 			printf("out of space\n");
159 			exit(1);
160 		}
161 		if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) {
162 			perror("sysctl of routing table");
163 			exit(1);
164 		}
165 		lim  = buf + needed;
166 	}
167 
168 	printf("Routing tables\n");
169 
170 	if (buf != NULL) {
171 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
172 			rtm = (struct rt_msghdr *)next;
173 			sa = (struct sockaddr *)(rtm + 1);
174 			if (af != 0 && sa->sa_family != af)
175 				continue;
176 			p_rtentry(rtm);
177 		}
178 		free(buf);
179 	}
180 }
181 
182 /* column widths; each followed by one space */
183 #define	WID_DST		(nflag ? 20 : 32)	/* destination column width */
184 #define	WID_GW		(nflag ? 20 : 32)	/* gateway column width */
185 
186 /*
187  * Print header for routing table columns.
188  */
189 static void
190 pr_rthdr(void)
191 {
192 	printf("%-*.*s %-*.*s %-6.6s\n",
193 	    WID_DST, WID_DST, "Destination",
194 	    WID_GW, WID_GW, "Gateway",
195 	    "Flags");
196 }
197 
198 /*
199  * Print a routing table entry.
200  */
201 static void
202 p_rtentry(struct rt_msghdr *rtm)
203 {
204 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
205 #ifdef notdef
206 	static int masks_done, banner_printed;
207 #endif
208 	static int old_af;
209 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
210 	int width;
211 
212 #ifdef notdef
213 	/* for the moment, netmasks are skipped over */
214 	if (!banner_printed) {
215 		printf("Netmasks:\n");
216 		banner_printed = 1;
217 	}
218 	if (masks_done == 0) {
219 		if (rtm->rtm_addrs != RTA_DST) {
220 			masks_done = 1;
221 			af = sa->sa_family;
222 		}
223 	} else
224 #endif
225 		af = sa->sa_family;
226 	if (old_af != af) {
227 		old_af = af;
228 		pr_family(af);
229 		pr_rthdr();
230 	}
231 
232 	/*
233 	 * Print the information.  If wflag is set p_sockaddr() can return
234 	 * a wider width then specified and we try to fit the second
235 	 * address in any remaining space so the flags still lines up.
236 	 */
237 	if (rtm->rtm_addrs == RTA_DST) {
238 		p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
239 	} else {
240 		width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
241 		sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
242 		p_sockaddr(sa, 0, WID_GW + WID_DST - width);
243 	}
244 	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
245 	putchar('\n');
246 }
247 
248 /*
249  * Print address family header before a section of the routing table.
250  */
251 static void
252 pr_family(int af)
253 {
254 	const char *afname;
255 
256 	switch (af) {
257 	case AF_INET:
258 		afname = "Internet";
259 		break;
260 #ifdef INET6
261 	case AF_INET6:
262 		afname = "Internet6";
263 		break;
264 #endif /* INET6 */
265 	case AF_NS:
266 		afname = "XNS";
267 		break;
268 	case AF_IPX:
269 		afname = "IPX";
270 		break;
271 	case AF_ISO:
272 		afname = "ISO";
273 		break;
274 	case AF_CCITT:
275 		afname = "X.25";
276 		break;
277 	case AF_APPLETALK:
278 		afname = "AppleTalk";
279 		break;
280 	default:
281 		afname = NULL;
282 		break;
283 	}
284 	if (afname != NULL)
285 		printf("\n%s:\n", afname);
286 	else
287 		printf("\nProtocol Family %d:\n", af);
288 }
289 
290 static int
291 p_sockaddr(struct sockaddr *sa, int flags, int width)
292 {
293 	char workbuf[128];
294 	char *cp = workbuf;
295 	const char *cplim;
296 	int len = sizeof(workbuf);
297 	int count;
298 
299 	switch(sa->sa_family) {
300 
301 	case AF_LINK:
302 	    {
303 		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
304 
305 		if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
306 		    sdl->sdl_slen == 0) {
307 			snprintf(workbuf, sizeof(workbuf),
308 			    "link#%d", sdl->sdl_index);
309 		} else {
310 			switch (sdl->sdl_type) {
311 			case IFT_ETHER:
312 			    {
313 				int i;
314 				u_char *lla = (u_char *)sdl->sdl_data +
315 				    sdl->sdl_nlen;
316 
317 				cplim = "";
318 				for (i = 0; i < sdl->sdl_alen; i++, lla++) {
319 					snprintf(cp, len, "%s%x", cplim, *lla);
320 					len -= strlen(cp);
321 					cp += strlen(cp);
322 					if (len <= 0)
323 						break;	/* overflow */
324 					cplim = ":";
325 				}
326 				cp = workbuf;
327 				break;
328 			    }
329 			default:
330 				cp = link_ntoa(sdl);
331 				break;
332 			}
333 		}
334 		break;
335 	    }
336 
337 	case AF_INET:
338 	    {
339 		struct sockaddr_in *in = (struct sockaddr_in *)sa;
340 
341 		if (in->sin_addr.s_addr == 0) {
342 			/* cp points to workbuf */
343 			strncpy(cp, "default", len);
344 		} else
345 			cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
346 		break;
347 	    }
348 
349 #ifdef INET6
350 	case AF_INET6:
351 	    {
352 		struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
353 
354 		if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
355 			/* cp points to workbuf */
356 			strncpy(cp, "default", len);
357 		} else {
358 			cp = ((flags & RTF_HOST) ? routename(sa)
359 						 : netname(sa));
360 		}
361 		/* make sure numeric address is not truncated */
362 		if (strchr(cp, ':') != NULL &&
363 		    (width < 0 || strlen(cp) > (size_t)width))
364 			width = strlen(cp);
365 		break;
366 	    }
367 #endif /* INET6 */
368 
369 	case AF_NS:
370 		cp = ns_print((struct sockaddr_ns *)sa);
371 		break;
372 
373 	default:
374 	    {
375 		u_char *s = (u_char *)sa->sa_data, *slim;
376 
377 		slim =  sa->sa_len + (u_char *) sa;
378 		cplim = cp + sizeof(workbuf) - 6;
379 		snprintf(cp, len, "(%d)", sa->sa_family);
380 		len -= strlen(cp);
381 		cp += strlen(cp);
382 		if (len <= 0) {
383 			cp = workbuf;
384 			break;		/* overflow */
385 		}
386 		while (s < slim && cp < cplim) {
387 			snprintf(cp, len, " %02x", *s++);
388 			len -= strlen(cp);
389 			cp += strlen(cp);
390 			if (len <= 0)
391 				break;		/* overflow */
392 			if (s < slim) {
393 				snprintf(cp, len, "%02x", *s++);
394 				len -= strlen(cp);
395 				cp += strlen(cp);
396 				if (len <= 0)
397 					break;		/* overflow */
398 			}
399 		}
400 		cp = workbuf;
401 	    }
402 	}
403 	if (width < 0) {
404 		count = printf("%s ", cp);
405 	} else {
406 		if (nflag || wflag)
407 			count = printf("%-*s ", width, cp);
408 		else
409 			count = printf("%-*.*s ", width, width, cp);
410 	}
411 	return(count);
412 }
413 
414 static void
415 p_flags(int f, const char *format)
416 {
417 	char name[33], *flags;
418 	const struct bits *p = bits;
419 
420 	for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
421 		if (p->b_mask & f)
422 			*flags++ = p->b_val;
423 	}
424 	*flags = '\0';
425 	printf(format, name);
426 }
427