xref: /dragonfly/sbin/route/show.c (revision 2cd2d2b5) 
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 1.3 2004/03/23 18:25:51 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 }
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, char *);
93 static void pr_rthdr(void);
94 static void pr_family(int);
95 
96 int	keyword(char *);
97 void	usage(char *);
98 void	show(int argc, char *argv[]);
99 
100 /*
101  * Print routing tables.
102  */
103 void
104 show(int argc, char *argv[])
105 {
106 	struct rt_msghdr *rtm;
107 	char *buf = NULL, *next, *lim = NULL;
108 	size_t needed;
109 	int mib[6], af = 0;
110         struct sockaddr *sa;
111 
112         if (argc > 1) {
113                 argv++;
114                 if (argc == 2 && **argv == '-')
115                     switch (keyword(*argv + 1)) {
116                         case K_INET:
117                                 af = AF_INET;
118                                 break;
119 #ifdef INET6
120                         case K_INET6:
121                                 af = AF_INET6;
122                                 break;
123 #endif
124                         case K_XNS:
125                                 af = AF_NS;
126                                 break;
127                         case K_LINK:
128                                 af = AF_LINK;
129                                 break;
130                         case K_ISO:
131                         case K_OSI:
132                                 af = AF_ISO;
133                                 break;
134                         case K_X25:
135                                 af = AF_CCITT;
136                                 break;
137                         default:
138                                 goto bad;
139                 } else
140 bad:                    usage(*argv);
141         }
142 	mib[0] = CTL_NET;
143 	mib[1] = PF_ROUTE;
144 	mib[2] = 0;
145 	mib[3] = 0;
146 	mib[4] = NET_RT_DUMP;
147 	mib[5] = 0;
148 	if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0)	{
149 		perror("route-sysctl-estimate");
150 		exit(1);
151 	}
152 	if (needed > 0) {
153 		if ((buf = malloc(needed)) == 0) {
154 			printf("out of space\n");
155 			exit(1);
156 		}
157 		if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
158 			perror("sysctl of routing table");
159 			exit(1);
160 		}
161 		lim  = buf + needed;
162 	}
163 
164 	printf("Routing tables\n");
165 
166 	if (buf) {
167 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
168 			rtm = (struct rt_msghdr *)next;
169 			sa = (struct sockaddr *)(rtm + 1);
170 			if (af && sa->sa_family != af)
171 				continue;
172 			p_rtentry(rtm);
173 		}
174 		free(buf);
175 	}
176 }
177 
178 /* column widths; each followed by one space */
179 #define	WID_DST		(nflag ? 20 : 32)	/* destination column width */
180 #define	WID_GW		(nflag ? 20 : 32)	/* gateway column width */
181 
182 /*
183  * Print header for routing table columns.
184  */
185 static void
186 pr_rthdr(void)
187 {
188 	printf("%-*.*s %-*.*s %-6.6s\n",
189 	    WID_DST, WID_DST, "Destination",
190 	    WID_GW, WID_GW, "Gateway",
191 	    "Flags");
192 }
193 
194 /*
195  * Print a routing table entry.
196  */
197 static void
198 p_rtentry(struct rt_msghdr *rtm)
199 {
200 	struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
201 #ifdef notdef
202 	static int masks_done, banner_printed;
203 #endif
204 	static int old_af;
205 	int af = 0, interesting = RTF_UP | RTF_GATEWAY | RTF_HOST;
206 	int width;
207 
208 #ifdef notdef
209 	/* for the moment, netmasks are skipped over */
210 	if (!banner_printed) {
211 		printf("Netmasks:\n");
212 		banner_printed = 1;
213 	}
214 	if (masks_done == 0) {
215 		if (rtm->rtm_addrs != RTA_DST ) {
216 			masks_done = 1;
217 			af = sa->sa_family;
218 		}
219 	} else
220 #endif
221 		af = sa->sa_family;
222 	if (old_af != af) {
223 		old_af = af;
224 		pr_family(af);
225 		pr_rthdr();
226 	}
227 
228 	/*
229 	 * Print the information.  If wflag is set p_sockaddr() can return
230 	 * a wider width then specified and we try to fit the second
231 	 * address in any remaining space so the flags still lines up.
232 	 */
233 	if (rtm->rtm_addrs == RTA_DST) {
234 		p_sockaddr(sa, 0, WID_DST + WID_GW + 2);
235 	} else {
236 		width = p_sockaddr(sa, rtm->rtm_flags, WID_DST);
237 		sa = (struct sockaddr *)(ROUNDUP(sa->sa_len) + (char *)sa);
238 		p_sockaddr(sa, 0, WID_GW + WID_DST - width);
239 	}
240 	p_flags(rtm->rtm_flags & interesting, "%-6.6s ");
241 	putchar('\n');
242 }
243 
244 /*
245  * Print address family header before a section of the routing table.
246  */
247 static void
248 pr_family(int af)
249 {
250 	char *afname;
251 
252 	switch (af) {
253 	case AF_INET:
254 		afname = "Internet";
255 		break;
256 #ifdef INET6
257 	case AF_INET6:
258 		afname = "Internet6";
259 		break;
260 #endif /* INET6 */
261 	case AF_NS:
262 		afname = "XNS";
263 		break;
264 	case AF_IPX:
265 		afname = "IPX";
266 		break;
267 	case AF_ISO:
268 		afname = "ISO";
269 		break;
270 	case AF_CCITT:
271 		afname = "X.25";
272 		break;
273 	case AF_APPLETALK:
274 		afname = "AppleTalk";
275 		break;
276 	default:
277 		afname = NULL;
278 		break;
279 	}
280 	if (afname)
281 		printf("\n%s:\n", afname);
282 	else
283 		printf("\nProtocol Family %d:\n", af);
284 }
285 
286 static int
287 p_sockaddr(struct sockaddr *sa, int flags, int width)
288 {
289 	char workbuf[128], *cplim;
290 	char *cp = workbuf;
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 			    {
308 				int i;
309 				u_char *lla = (u_char *)sdl->sdl_data +
310 				    sdl->sdl_nlen;
311 
312 				cplim = "";
313 				for (i = 0; i < sdl->sdl_alen; i++, lla++) {
314 					snprintf(cp, len, "%s%x", cplim, *lla);
315 					len -= strlen(cp);
316 					cp += strlen(cp);
317 					if (len <= 0)
318 						break;	/* overflow */
319 					cplim = ":";
320 				}
321 				cp = workbuf;
322 				break;
323 			    }
324 			default:
325 				cp = link_ntoa(sdl);
326 				break;
327 			}
328 		}
329 		break;
330 	    }
331 
332 	case AF_INET:
333 	    {
334 		struct sockaddr_in *sin = (struct sockaddr_in *)sa;
335 
336 		if (sin->sin_addr.s_addr == 0)
337 			cp = "default";
338 		else
339 			cp = (flags & RTF_HOST) ? routename(sa) : netname(sa);
340 		break;
341 	    }
342 
343 #ifdef INET6
344 	case AF_INET6:
345 	    {
346 		struct sockaddr_in6 *sin = (struct sockaddr_in6 *)sa;
347 
348 		cp = IN6_IS_ADDR_UNSPECIFIED(&sin->sin6_addr) ? "default" :
349 			((flags & RTF_HOST) ?  routename(sa) :	netname(sa));
350 		/* make sure numeric address is not truncated */
351 		if (strchr(cp, ':') != NULL && strlen(cp) > width)
352 			width = strlen(cp);
353 		break;
354 	    }
355 #endif /* INET6 */
356 
357 	case AF_NS:
358 		cp = ns_print((struct sockaddr_ns *)sa);
359 		break;
360 
361 	default:
362 	    {
363 		u_char *s = (u_char *)sa->sa_data, *slim;
364 
365 		slim =  sa->sa_len + (u_char *) sa;
366 		cplim = cp + sizeof(workbuf) - 6;
367 		snprintf(cp, len, "(%d)", sa->sa_family);
368 		len -= strlen(cp);
369 		cp += strlen(cp);
370 		if (len <= 0) {
371 			cp = workbuf;
372 			break;		/* overflow */
373 		}
374 		while (s < slim && cp < cplim) {
375 			snprintf(cp, len, " %02x", *s++);
376 			len -= strlen(cp);
377 			cp += strlen(cp);
378 			if (len <= 0)
379 				break;		/* overflow */
380 			if (s < slim) {
381 				snprintf(cp, len, "%02x", *s++);
382 				len -= strlen(cp);
383 				cp += strlen(cp);
384 				if (len <= 0)
385 					break;		/* overflow */
386 			}
387 		}
388 		cp = workbuf;
389 	    }
390 	}
391 	if (width < 0 ) {
392 		count = printf("%s ", cp);
393 	} else {
394 		if (nflag || wflag)
395 			count = printf("%-*s ", width, cp);
396 		else
397 			count = printf("%-*.*s ", width, width, cp);
398 	}
399 	return(count);
400 }
401 
402 static void
403 p_flags(int f, char *format)
404 {
405 	char name[33], *flags;
406 	const struct bits *p = bits;
407 
408 	for (flags = name; p->b_mask && flags < &name[sizeof(name-2)]; p++) {
409 		if (p->b_mask & f)
410 			*flags++ = p->b_val;
411 	}
412 	*flags = '\0';
413 	printf(format, name);
414 }
415