xref: /dragonfly/sbin/route/show.c (revision 0dace59e) 
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  */
5 /*
6  * Copyright (c) 1983, 1988, 1993
7  *	The Regents of the University of California.  All rights reserved.
8  *
9  * Redistribution and use in source and binary forms, with or without
10  * modification, are permitted provided that the following conditions
11  * are met:
12  * 1. Redistributions of source code must retain the above copyright
13  *    notice, this list of conditions and the following disclaimer.
14  * 2. Redistributions in binary form must reproduce the above copyright
15  *    notice, this list of conditions and the following disclaimer in the
16  *    documentation and/or other materials provided with the distribution.
17  * 3. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #include <sys/param.h>
35 #include <sys/protosw.h>
36 #include <sys/socket.h>
37 #include <sys/mbuf.h>
38 
39 #include <net/if.h>
40 #include <net/if_dl.h>
41 #include <net/if_types.h>
42 #include <net/route.h>
43 #include <netinet/in.h>
44 #include <arpa/inet.h>
45 
46 #include <sys/sysctl.h>
47 
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <unistd.h>
52 
53 #include <netdb.h>
54 
55 #include "extern.h"
56 #include "keywords.h"
57 
58 #define ROUNDUP(a) \
59 	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
60 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
61 
62 /*
63  * Definitions for showing gateway flags.
64  */
65 struct bits {
66 	int	b_mask;
67 	char	b_val;
68 };
69 static const struct bits bits[] = {
70 	{ RTF_UP,	'U' },
71 	{ RTF_GATEWAY,	'G' },
72 	{ RTF_HOST,	'H' },
73 	{ RTF_REJECT,	'R' },
74 	{ RTF_BLACKHOLE, 'B' },
75 	{ RTF_DYNAMIC,	'D' },
76 	{ RTF_MODIFIED,	'M' },
77 	{ RTF_DONE,	'd' }, /* Completed -- for routing messages only */
78 	{ RTF_CLONING,	'C' },
79 	{ RTF_XRESOLVE,	'X' },
80 	{ RTF_LLINFO,	'L' },
81 	{ RTF_STATIC,	'S' },
82 	{ RTF_PROTO1,	'1' },
83 	{ RTF_PROTO2,	'2' },
84 	{ RTF_PROTO3,	'3' },
85 	{ 0, 0 }
86 };
87 
88 static void	p_rtentry(struct rt_msghdr *);
89 static int	p_sockaddr(struct sockaddr *, int, int);
90 static void	p_flags(int, const char *);
91 static void	pr_rthdr(void);
92 static void	pr_family(int);
93 
94 /*
95  * Print routing tables.
96  */
97 void
98 show(int argc, char *argv[])
99 {
100 	struct rt_msghdr *rtm;
101 	char *buf = NULL, *next, *lim = NULL;
102 	size_t needed;
103 	int mib[7], af = 0;
104 	int miblen;
105         struct sockaddr *sa;
106 
107         if (argc > 1) {
108                 argv++;
109                 if (argc == 2 && **argv == '-') {
110                     switch (keyword(*argv + 1)) {
111                         case K_INET:
112                                 af = AF_INET;
113                                 break;
114 #ifdef INET6
115                         case K_INET6:
116                                 af = AF_INET6;
117                                 break;
118 #endif
119                         case K_XNS:
120                                 af = AF_NS;
121                                 break;
122                         case K_LINK:
123                                 af = AF_LINK;
124                                 break;
125                         case K_ISO:
126                         case K_OSI:
127                                 af = AF_ISO;
128                                 break;
129                         case K_X25:
130                                 af = AF_CCITT;
131                                 break;
132                         default:
133                                 goto bad;
134 		    }
135                 } else
136 bad:                    usage(*argv);
137         }
138 	mib[0] = CTL_NET;
139 	mib[1] = PF_ROUTE;
140 	mib[2] = 0;
141 	mib[3] = 0;
142 	mib[4] = NET_RT_DUMP;
143 	mib[5] = 0;
144 	if (cpuflag >= 0) {
145 		mib[6] = cpuflag;
146 		miblen = 7;
147 	} else {
148 		miblen = 6;
149 	}
150 	if (sysctl(mib, miblen, NULL, &needed, NULL, 0) < 0)	{
151 		perror("route-sysctl-estimate");
152 		exit(1);
153 	}
154 	if (needed > 0) {
155 		if ((buf = malloc(needed)) == NULL) {
156 			printf("out of space\n");
157 			exit(1);
158 		}
159 		if (sysctl(mib, miblen, buf, &needed, NULL, 0) < 0) {
160 			perror("sysctl of routing table");
161 			exit(1);
162 		}
163 		lim  = buf + needed;
164 	}
165 
166 	printf("Routing tables\n");
167 
168 	if (buf != NULL) {
169 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
170 			rtm = (struct rt_msghdr *)next;
171 			sa = (struct sockaddr *)(rtm + 1);
172 			if (af != 0 && sa->sa_family != af)
173 				continue;
174 			p_rtentry(rtm);
175 		}
176 		free(buf);
177 	}
178 }
179 
180 /* column widths; each followed by one space */
181 #define	WID_DST		(nflag ? 20 : 32)	/* destination column width */
182 #define	WID_GW		(nflag ? 20 : 32)	/* gateway column width */
183 
184 /*
185  * Print header for routing table columns.
186  */
187 static void
188 pr_rthdr(void)
189 {
190 	printf("%-*.*s %-*.*s %-6.6s\n",
191 	    WID_DST, WID_DST, "Destination",
192 	    WID_GW, WID_GW, "Gateway",
193 	    "Flags");
194 }
195 
196 /*
197  * Print a routing table entry.
198  */
199 static void
200 p_rtentry(struct rt_msghdr *rtm)
201 {
202 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
203 #ifdef notdef
204 	static int masks_done, banner_printed;
205 #endif
206 	static int old_af;
207 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
208 	int width;
209 
210 #ifdef notdef
211 	/* for the moment, netmasks are skipped over */
212 	if (!banner_printed) {
213 		printf("Netmasks:\n");
214 		banner_printed = 1;
215 	}
216 	if (masks_done == 0) {
217 		if (rtm->rtm_addrs != RTA_DST) {
218 			masks_done = 1;
219 			af = sa->sa_family;
220 		}
221 	} else
222 #endif
223 		af = sa->sa_family;
224 	if (old_af != af) {
225 		old_af = af;
226 		pr_family(af);
227 		pr_rthdr();
228 	}
229 
230 	/*
231 	 * Print the information.  If wflag is set p_sockaddr() can return
232 	 * a wider width then specified and we try to fit the second
233 	 * address in any remaining space so the flags still lines up.
234 	 */
235 	if (rtm->rtm_addrs == RTA_DST) {
236 		p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
237 	} else {
238 		width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
239 		sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
240 		p_sockaddr(sa, 0, WID_GW + WID_DST - width);
241 	}
242 	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
243 	putchar('\n');
244 }
245 
246 /*
247  * Print address family header before a section of the routing table.
248  */
249 static void
250 pr_family(int af)
251 {
252 	const char *afname;
253 
254 	switch (af) {
255 	case AF_INET:
256 		afname = "Internet";
257 		break;
258 #ifdef INET6
259 	case AF_INET6:
260 		afname = "Internet6";
261 		break;
262 #endif /* INET6 */
263 	case AF_NS:
264 		afname = "XNS";
265 		break;
266 	case AF_IPX:
267 		afname = "IPX";
268 		break;
269 	case AF_ISO:
270 		afname = "ISO";
271 		break;
272 	case AF_CCITT:
273 		afname = "X.25";
274 		break;
275 	default:
276 		afname = NULL;
277 		break;
278 	}
279 	if (afname != NULL)
280 		printf("\n%s:\n", afname);
281 	else
282 		printf("\nProtocol Family %d:\n", af);
283 }
284 
285 static int
286 p_sockaddr(struct sockaddr *sa, int flags, int width)
287 {
288 	char workbuf[128];
289 	char *cp = workbuf;
290 	const char *cplim;
291 	int len = sizeof(workbuf);
292 	int count;
293 
294 	switch(sa->sa_family) {
295 
296 	case AF_LINK:
297 	    {
298 		struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
299 
300 		if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
301 		    sdl->sdl_slen == 0) {
302 			snprintf(workbuf, sizeof(workbuf),
303 			    "link#%d", sdl->sdl_index);
304 		} else {
305 			switch (sdl->sdl_type) {
306 			case IFT_ETHER:
307 			case IFT_L2VLAN:
308 			case IFT_CARP:
309 			    {
310 				int i;
311 				u_char *lla = (u_char *)sdl->sdl_data +
312 				    sdl->sdl_nlen;
313 
314 				cplim = "";
315 				for (i = 0; i < sdl->sdl_alen; i++, lla++) {
316 					snprintf(cp, len, "%s%02x",
317 					    cplim, *lla);
318 					len -= strlen(cp);
319 					cp += strlen(cp);
320 					if (len <= 0)
321 						break;	/* overflow */
322 					cplim = ":";
323 				}
324 				cp = workbuf;
325 				break;
326 			    }
327 			default:
328 				cp = link_ntoa(sdl);
329 				break;
330 			}
331 		}
332 		break;
333 	    }
334 
335 	case AF_INET:
336 	    {
337 		struct sockaddr_in *in = (struct sockaddr_in *)sa;
338 
339 		if (in->sin_addr.s_addr == 0) {
340 			/* cp points to workbuf */
341 			strncpy(cp, "default", len);
342 		} else
343 			cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
344 		break;
345 	    }
346 
347 #ifdef INET6
348 	case AF_INET6:
349 	    {
350 		struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)sa;
351 
352 		if (IN6_IS_ADDR_UNSPECIFIED(&in6->sin6_addr)) {
353 			/* cp points to workbuf */
354 			strncpy(cp, "default", len);
355 		} else {
356 			cp = ((flags & RTF_HOST) ? routename(sa)
357 						 : netname(sa));
358 		}
359 		/* make sure numeric address is not truncated */
360 		if (strchr(cp, ':') != NULL &&
361 		    (width < 0 || strlen(cp) > (size_t)width))
362 			width = strlen(cp);
363 		break;
364 	    }
365 #endif /* INET6 */
366 
367 	default:
368 	    {
369 		u_char *s = (u_char *)sa->sa_data, *slim;
370 
371 		slim =  sa->sa_len + (u_char *) sa;
372 		cplim = cp + sizeof(workbuf) - 6;
373 		snprintf(cp, len, "(%d)", sa->sa_family);
374 		len -= strlen(cp);
375 		cp += strlen(cp);
376 		if (len <= 0) {
377 			cp = workbuf;
378 			break;		/* overflow */
379 		}
380 		while (s < slim && cp < cplim) {
381 			snprintf(cp, len, " %02x", *s++);
382 			len -= strlen(cp);
383 			cp += strlen(cp);
384 			if (len <= 0)
385 				break;		/* overflow */
386 			if (s < slim) {
387 				snprintf(cp, len, "%02x", *s++);
388 				len -= strlen(cp);
389 				cp += strlen(cp);
390 				if (len <= 0)
391 					break;		/* overflow */
392 			}
393 		}
394 		cp = workbuf;
395 	    }
396 	}
397 	if (width < 0) {
398 		count = printf("%s ", cp);
399 	} else {
400 		if (nflag || wflag)
401 			count = printf("%-*s ", width, cp);
402 		else
403 			count = printf("%-*.*s ", width, width, cp);
404 	}
405 	return(count);
406 }
407 
408 static void
409 p_flags(int f, const char *format)
410 {
411 	char name[33], *flags;
412 	const struct bits *p = bits;
413 
414 	for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
415 		if (p->b_mask & f)
416 			*flags++ = p->b_val;
417 	}
418 	*flags = '\0';
419 	printf(format, name);
420 }
421