xref: /dragonfly/sbin/route/show.c (revision 03be034e) 
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 1.5 2005/03/16 07:30:33 cpressey 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[6], af = 0;
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 (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)	{
146 		perror("route-sysctl-estimate");
147 		exit(1);
148 	}
149 	if (needed > 0) {
150 		if ((buf = malloc(needed)) == NULL) {
151 			printf("out of space\n");
152 			exit(1);
153 		}
154 		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
155 			perror("sysctl of routing table");
156 			exit(1);
157 		}
158 		lim  = buf + needed;
159 	}
160 
161 	printf("Routing tables\n");
162 
163 	if (buf != NULL) {
164 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
165 			rtm = (struct rt_msghdr *)next;
166 			sa = (struct sockaddr *)(rtm + 1);
167 			if (af != 0 && sa->sa_family != af)
168 				continue;
169 			p_rtentry(rtm);
170 		}
171 		free(buf);
172 	}
173 }
174 
175 /* column widths; each followed by one space */
176 #define	WID_DST		(nflag ? 20 : 32)	/* destination column width */
177 #define	WID_GW		(nflag ? 20 : 32)	/* gateway column width */
178 
179 /*
180  * Print header for routing table columns.
181  */
182 static void
183 pr_rthdr(void)
184 {
185 	printf("%-*.*s %-*.*s %-6.6s\n",
186 	    WID_DST, WID_DST, "Destination",
187 	    WID_GW, WID_GW, "Gateway",
188 	    "Flags");
189 }
190 
191 /*
192  * Print a routing table entry.
193  */
194 static void
195 p_rtentry(struct rt_msghdr *rtm)
196 {
197 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
198 #ifdef notdef
199 	static int masks_done, banner_printed;
200 #endif
201 	static int old_af;
202 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
203 	int width;
204 
205 #ifdef notdef
206 	/* for the moment, netmasks are skipped over */
207 	if (!banner_printed) {
208 		printf("Netmasks:\n");
209 		banner_printed = 1;
210 	}
211 	if (masks_done == 0) {
212 		if (rtm->rtm_addrs != RTA_DST) {
213 			masks_done = 1;
214 			af = sa->sa_family;
215 		}
216 	} else
217 #endif
218 		af = sa->sa_family;
219 	if (old_af != af) {
220 		old_af = af;
221 		pr_family(af);
222 		pr_rthdr();
223 	}
224 
225 	/*
226 	 * Print the information.  If wflag is set p_sockaddr() can return
227 	 * a wider width then specified and we try to fit the second
228 	 * address in any remaining space so the flags still lines up.
229 	 */
230 	if (rtm->rtm_addrs == RTA_DST) {
231 		p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
232 	} else {
233 		width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
234 		sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
235 		p_sockaddr(sa, 0, WID_GW + WID_DST - width);
236 	}
237 	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
238 	putchar('\n');
239 }
240 
241 /*
242  * Print address family header before a section of the routing table.
243  */
244 static void
245 pr_family(int af)
246 {
247 	const char *afname;
248 
249 	switch (af) {
250 	case AF_INET:
251 		afname = "Internet";
252 		break;
253 #ifdef INET6
254 	case AF_INET6:
255 		afname = "Internet6";
256 		break;
257 #endif /* INET6 */
258 	case AF_NS:
259 		afname = "XNS";
260 		break;
261 	case AF_IPX:
262 		afname = "IPX";
263 		break;
264 	case AF_ISO:
265 		afname = "ISO";
266 		break;
267 	case AF_CCITT:
268 		afname = "X.25";
269 		break;
270 	case AF_APPLETALK:
271 		afname = "AppleTalk";
272 		break;
273 	default:
274 		afname = NULL;
275 		break;
276 	}
277 	if (afname != NULL)
278 		printf("\n%s:\n", afname);
279 	else
280 		printf("\nProtocol Family %d:\n", af);
281 }
282 
283 static int
284 p_sockaddr(struct sockaddr *sa, int flags, int width)
285 {
286 	char workbuf[128];
287 	char *cp = workbuf;
288 	const char *cplim;
289 	int len = sizeof(workbuf);
290 	int count;
291 
292 	switch(sa->sa_family) {
293 
294 	case AF_LINK:
295 	    {
296 		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
297 
298 		if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
299 		    sdl->sdl_slen == 0) {
300 			snprintf(workbuf, sizeof(workbuf),
301 			    "link#%d", sdl->sdl_index);
302 		} else {
303 			switch (sdl->sdl_type) {
304 			case IFT_ETHER:
305 			    {
306 				int i;
307 				u_char *lla = (u_char *)sdl->sdl_data +
308 				    sdl->sdl_nlen;
309 
310 				cplim = "";
311 				for (i = 0; i < sdl->sdl_alen; i++, lla++) {
312 					snprintf(cp, len, "%s%x", cplim, *lla);
313 					len -= strlen(cp);
314 					cp += strlen(cp);
315 					if (len <= 0)
316 						break;	/* overflow */
317 					cplim = ":";
318 				}
319 				cp = workbuf;
320 				break;
321 			    }
322 			default:
323 				cp = link_ntoa(sdl);
324 				break;
325 			}
326 		}
327 		break;
328 	    }
329 
330 	case AF_INET:
331 	    {
332 		struct sockaddr_in *in = (struct sockaddr_in *)sa;
333 
334 		if (in->sin_addr.s_addr == 0) {
335 			/* cp points to workbuf */
336 			strncpy(cp, "default", len);
337 		} else
338 			cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
339 		break;
340 	    }
341 
342 #ifdef INET6
343 	case AF_INET6:
344 	    {
345 		struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
346 
347 		if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
348 			/* cp points to workbuf */
349 			strncpy(cp, "default", len);
350 		} else {
351 			cp = ((flags & RTF_HOST) ? routename(sa)
352 						 : netname(sa));
353 		}
354 		/* make sure numeric address is not truncated */
355 		if (strchr(cp, ':') != NULL &&
356 		    (width < 0 || strlen(cp) > (size_t)width))
357 			width = strlen(cp);
358 		break;
359 	    }
360 #endif /* INET6 */
361 
362 	case AF_NS:
363 		cp = ns_print((struct sockaddr_ns *)sa);
364 		break;
365 
366 	default:
367 	    {
368 		u_char *s = (u_char *)sa->sa_data, *slim;
369 
370 		slim =  sa->sa_len + (u_char *) sa;
371 		cplim = cp + sizeof(workbuf) - 6;
372 		snprintf(cp, len, "(%d)", sa->sa_family);
373 		len -= strlen(cp);
374 		cp += strlen(cp);
375 		if (len <= 0) {
376 			cp = workbuf;
377 			break;		/* overflow */
378 		}
379 		while (s < slim && cp < cplim) {
380 			snprintf(cp, len, " %02x", *s++);
381 			len -= strlen(cp);
382 			cp += strlen(cp);
383 			if (len <= 0)
384 				break;		/* overflow */
385 			if (s < slim) {
386 				snprintf(cp, len, "%02x", *s++);
387 				len -= strlen(cp);
388 				cp += strlen(cp);
389 				if (len <= 0)
390 					break;		/* overflow */
391 			}
392 		}
393 		cp = workbuf;
394 	    }
395 	}
396 	if (width < 0) {
397 		count = printf("%s ", cp);
398 	} else {
399 		if (nflag || wflag)
400 			count = printf("%-*s ", width, cp);
401 		else
402 			count = printf("%-*.*s ", width, width, cp);
403 	}
404 	return(count);
405 }
406 
407 static void
408 p_flags(int f, const char *format)
409 {
410 	char name[33], *flags;
411 	const struct bits *p = bits;
412 
413 	for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
414 		if (p->b_mask & f)
415 			*flags++ = p->b_val;
416 	}
417 	*flags = '\0';
418 	printf(format, name);
419 }
420