traceroute6.c revision 1.18 1 /* $NetBSD: traceroute6.c,v 1.18 2002/02/19 02:29:58 itojun Exp $ */
2 /* $KAME: traceroute6.c,v 1.39 2000/12/22 15:11:05 itojun Exp $ */
3
4 /*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 /*-
34 * Copyright (c) 1990, 1993
35 * The Regents of the University of California. All rights reserved.
36 *
37 * This code is derived from software contributed to Berkeley by
38 * Van Jacobson.
39 *
40 * Redistribution and use in source and binary forms, with or without
41 * modification, are permitted provided that the following conditions
42 * are met:
43 * 1. Redistributions of source code must retain the above copyright
44 * notice, this list of conditions and the following disclaimer.
45 * 2. Redistributions in binary form must reproduce the above copyright
46 * notice, this list of conditions and the following disclaimer in the
47 * documentation and/or other materials provided with the distribution.
48 * 3. All advertising materials mentioning features or use of this software
49 * must display the following acknowledgement:
50 * This product includes software developed by the University of
51 * California, Berkeley and its contributors.
52 * 4. Neither the name of the University nor the names of its contributors
53 * may be used to endorse or promote products derived from this software
54 * without specific prior written permission.
55 *
56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
66 * SUCH DAMAGE.
67 */
68
69 #if 0
70 #ifndef lint
71 static char copyright[] =
72 "@(#) Copyright (c) 1990, 1993\n\
73 The Regents of the University of California. All rights reserved.\n";
74 #endif /* not lint */
75
76 #ifndef lint
77 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
78 #endif /* not lint */
79 #else
80 #include <sys/cdefs.h>
81 #ifndef lint
82 __RCSID("$NetBSD: traceroute6.c,v 1.18 2002/02/19 02:29:58 itojun Exp $");
83 #endif
84 #endif
85
86 /*
87 * traceroute host - trace the route ip packets follow going to "host".
88 *
89 * Attempt to trace the route an ip packet would follow to some
90 * internet host. We find out intermediate hops by launching probe
91 * packets with a small ttl (time to live) then listening for an
92 * icmp "time exceeded" reply from a gateway. We start our probes
93 * with a ttl of one and increase by one until we get an icmp "port
94 * unreachable" (which means we got to "host") or hit a max (which
95 * defaults to 30 hops & can be changed with the -m flag). Three
96 * probes (change with -q flag) are sent at each ttl setting and a
97 * line is printed showing the ttl, address of the gateway and
98 * round trip time of each probe. If the probe answers come from
99 * different gateways, the address of each responding system will
100 * be printed. If there is no response within a 5 sec. timeout
101 * interval (changed with the -w flag), a "*" is printed for that
102 * probe.
103 *
104 * Probe packets are UDP format. We don't want the destination
105 * host to process them so the destination port is set to an
106 * unlikely value (if some clod on the destination is using that
107 * value, it can be changed with the -p flag).
108 *
109 * A sample use might be:
110 *
111 * [yak 71]% traceroute nis.nsf.net.
112 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
113 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
114 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
115 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
116 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
117 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
118 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
119 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
120 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
121 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
122 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
123 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
124 *
125 * Note that lines 2 & 3 are the same. This is due to a buggy
126 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
127 * packets with a zero ttl.
128 *
129 * A more interesting example is:
130 *
131 * [yak 72]% traceroute allspice.lcs.mit.edu.
132 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
133 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
134 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
135 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
136 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
137 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
138 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
139 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
140 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
141 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
142 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
143 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
144 * 12 * * *
145 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
146 * 14 * * *
147 * 15 * * *
148 * 16 * * *
149 * 17 * * *
150 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
151 *
152 * (I start to see why I'm having so much trouble with mail to
153 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
154 * either don't send ICMP "time exceeded" messages or send them
155 * with a ttl too small to reach us. 14 - 17 are running the
156 * MIT C Gateway code that doesn't send "time exceeded"s. God
157 * only knows what's going on with 12.
158 *
159 * The silent gateway 12 in the above may be the result of a bug in
160 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
161 * sends an unreachable message using whatever ttl remains in the
162 * original datagram. Since, for gateways, the remaining ttl is
163 * zero, the icmp "time exceeded" is guaranteed to not make it back
164 * to us. The behavior of this bug is slightly more interesting
165 * when it appears on the destination system:
166 *
167 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
168 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
169 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
170 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
171 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
172 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
173 * 7 * * *
174 * 8 * * *
175 * 9 * * *
176 * 10 * * *
177 * 11 * * *
178 * 12 * * *
179 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
180 *
181 * Notice that there are 12 "gateways" (13 is the final
182 * destination) and exactly the last half of them are "missing".
183 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
184 * is using the ttl from our arriving datagram as the ttl in its
185 * icmp reply. So, the reply will time out on the return path
186 * (with no notice sent to anyone since icmp's aren't sent for
187 * icmp's) until we probe with a ttl that's at least twice the path
188 * length. I.e., rip is really only 7 hops away. A reply that
189 * returns with a ttl of 1 is a clue this problem exists.
190 * Traceroute prints a "!" after the time if the ttl is <= 1.
191 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
192 * non-standard (HPUX) software, expect to see this problem
193 * frequently and/or take care picking the target host of your
194 * probes.
195 *
196 * Other possible annotations after the time are !H, !N, !P (got a host,
197 * network or protocol unreachable, respectively), !S or !F (source
198 * route failed or fragmentation needed -- neither of these should
199 * ever occur and the associated gateway is busted if you see one). If
200 * almost all the probes result in some kind of unreachable, traceroute
201 * will give up and exit.
202 *
203 * Notes
204 * -----
205 * This program must be run by root or be setuid. (I suggest that
206 * you *don't* make it setuid -- casual use could result in a lot
207 * of unnecessary traffic on our poor, congested nets.)
208 *
209 * This program requires a kernel mod that does not appear in any
210 * system available from Berkeley: A raw ip socket using proto
211 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
212 * opposed to data to be wrapped in a ip datagram). See the README
213 * file that came with the source to this program for a description
214 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
215 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
216 * MODIFIED TO RUN THIS PROGRAM.
217 *
218 * The udp port usage may appear bizarre (well, ok, it is bizarre).
219 * The problem is that an icmp message only contains 8 bytes of
220 * data from the original datagram. 8 bytes is the size of a udp
221 * header so, if we want to associate replies with the original
222 * datagram, the necessary information must be encoded into the
223 * udp header (the ip id could be used but there's no way to
224 * interlock with the kernel's assignment of ip id's and, anyway,
225 * it would have taken a lot more kernel hacking to allow this
226 * code to set the ip id). So, to allow two or more users to
227 * use traceroute simultaneously, we use this task's pid as the
228 * source port (the high bit is set to move the port number out
229 * of the "likely" range). To keep track of which probe is being
230 * replied to (so times and/or hop counts don't get confused by a
231 * reply that was delayed in transit), we increment the destination
232 * port number before each probe.
233 *
234 * Don't use this as a coding example. I was trying to find a
235 * routing problem and this code sort-of popped out after 48 hours
236 * without sleep. I was amazed it ever compiled, much less ran.
237 *
238 * I stole the idea for this program from Steve Deering. Since
239 * the first release, I've learned that had I attended the right
240 * IETF working group meetings, I also could have stolen it from Guy
241 * Almes or Matt Mathis. I don't know (or care) who came up with
242 * the idea first. I envy the originators' perspicacity and I'm
243 * glad they didn't keep the idea a secret.
244 *
245 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
246 * enhancements to the original distribution.
247 *
248 * I've hacked up a round-trip-route version of this that works by
249 * sending a loose-source-routed udp datagram through the destination
250 * back to yourself. Unfortunately, SO many gateways botch source
251 * routing, the thing is almost worthless. Maybe one day...
252 *
253 * -- Van Jacobson (van (at) helios.ee.lbl.gov)
254 * Tue Dec 20 03:50:13 PST 1988
255 */
256
257 #include <sys/param.h>
258 #include <sys/time.h>
259 #include <sys/socket.h>
260 #include <sys/uio.h>
261 #include <sys/file.h>
262 #include <sys/ioctl.h>
263
264 #include <netinet/in.h>
265
266 #include <arpa/inet.h>
267
268 #include <netdb.h>
269 #include <stdio.h>
270 #include <err.h>
271 #ifdef HAVE_POLL
272 #include <poll.h>
273 #endif
274 #include <errno.h>
275 #include <stdlib.h>
276 #include <string.h>
277 #include <unistd.h>
278
279 #include <netinet/ip6.h>
280 #include <netinet/icmp6.h>
281 #include <netinet/udp.h>
282
283 #ifdef IPSEC
284 #include <net/route.h>
285 #include <netinet6/ipsec.h>
286 #endif
287
288 #define DUMMY_PORT 10010
289
290 #define MAXPACKET 65535 /* max ip packet size */
291
292 #ifndef FD_SET
293 #define NFDBITS (8*sizeof(fd_set))
294 #define FD_SETSIZE NFDBITS
295 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
296 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
297 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
298 #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
299 #endif
300
301 #define Fprintf (void)fprintf
302 #define Sprintf (void)sprintf
303 #define Printf (void)printf
304
305 #ifndef HAVE_GETIPNODEBYNAME
306 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
307 #define freehostent(x)
308 #endif
309
310 /*
311 * format of a (udp) probe packet.
312 */
313 struct opacket {
314 u_char seq; /* sequence number of this packet */
315 u_char hops; /* hop limit of the packet */
316 struct timeval tv; /* time packet left */
317 };
318
319 u_char packet[512]; /* last inbound (icmp) packet */
320 struct opacket *outpacket; /* last output (udp) packet */
321
322 int main __P((int, char *[]));
323 int wait_for_reply __P((int, struct msghdr *));
324 #ifdef IPSEC
325 #ifdef IPSEC_POLICY_IPSEC
326 int setpolicy __P((int so, char *policy));
327 #endif
328 #endif
329 void send_probe __P((int, int));
330 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *));
331 int get_hoplim __P((struct msghdr *));
332 double deltaT __P((struct timeval *, struct timeval *));
333 char *pr_type __P((int));
334 int packet_ok __P((struct msghdr *, int, int));
335 void print __P((struct msghdr *, int));
336 void tvsub __P((struct timeval *, struct timeval *));
337 const char *inetname __P((struct sockaddr *));
338 void usage __P((void));
339
340 int rcvsock; /* receive (icmp) socket file descriptor */
341 int sndsock; /* send (udp) socket file descriptor */
342 struct timezone tz; /* leftover */
343
344 struct msghdr rcvmhdr;
345 struct iovec rcviov[2];
346 int rcvhlim;
347 struct in6_pktinfo *rcvpktinfo;
348
349 struct sockaddr_in6 Src, Dst, Rcv;
350 int datalen; /* How much data */
351 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
352 char rtbuf[2064];
353 #ifdef USE_RFC2292BIS
354 struct ip6_rthdr *rth;
355 #endif
356 struct cmsghdr *cmsg;
357
358 char *source = 0;
359 char *hostname;
360
361 int nprobes = 3;
362 int first_hop = 1;
363 int max_hops = 30;
364 u_short ident;
365 u_short port = 32768+666; /* start udp dest port # for probe packets */
366 int options; /* socket options */
367 int verbose;
368 int waittime = 5; /* time to wait for response (in seconds) */
369 int nflag; /* print addresses numerically */
370 int lflag; /* print both numerical address & hostname */
371
372 #ifdef KAME_SCOPEID
373 const int niflag = NI_WITHSCOPEID;
374 #else
375 const int niflag = 0;
376 #endif
377
378 int
379 main(argc, argv)
380 int argc;
381 char *argv[];
382 {
383 struct hostent *hp;
384 int error;
385 struct addrinfo hints, *res;
386 int ch, i, on, probe, seq, hops, rcvcmsglen;
387 static u_char *rcvcmsgbuf;
388 char hbuf[NI_MAXHOST], src0[NI_MAXHOST];
389 char *ep;
390
391 /*
392 * Receive ICMP
393 */
394 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
395 perror("socket(ICMPv6)");
396 exit(5);
397 }
398
399 /* revoke privs */
400 seteuid(getuid());
401 setuid(getuid());
402
403 /* set a minimum set of socket options */
404 on = 1;
405 /* specify to tell receiving interface */
406 #ifdef IPV6_RECVPKTINFO
407 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
408 sizeof(on)) < 0)
409 err(1, "setsockopt(IPV6_RECVPKTINFO)");
410 #else /* old adv. API */
411 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
412 sizeof(on)) < 0)
413 err(1, "setsockopt(IPV6_PKTINFO)");
414 #endif
415
416 /* specify to tell value of hoplimit field of received IP6 hdr */
417 #ifdef IPV6_RECVHOPLIMIT
418 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
419 sizeof(on)) < 0)
420 err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
421 #else /* old adv. API */
422 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
423 sizeof(on)) < 0)
424 err(1, "setsockopt(IPV6_HOPLIMIT)");
425 #endif
426
427 seq = 0;
428
429 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1)
430 switch(ch) {
431 case 'd':
432 options |= SO_DEBUG;
433 break;
434 case 'f':
435 ep = NULL;
436 first_hop = strtoul(optarg, &ep, 0);
437 if (!*argv || *ep) {
438 Fprintf(stderr,
439 "traceroute6: invalid min hoplimit.\n");
440 exit(1);
441 }
442 if (first_hop > max_hops) {
443 Fprintf(stderr,
444 "traceroute6: min hoplimit must be <= %d.\n", max_hops);
445 exit(1);
446 }
447 break;
448 case 'g':
449 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
450 if (hp == NULL) {
451 Fprintf(stderr,
452 "traceroute6: unknown host %s\n", optarg);
453 exit(1);
454 }
455 #ifdef USE_RFC2292BIS
456 if (rth == NULL) {
457 /*
458 * XXX: We can't detect the number of
459 * intermediate nodes yet.
460 */
461 if ((rth = inet6_rth_init((void *)rtbuf,
462 sizeof(rtbuf),
463 IPV6_RTHDR_TYPE_0,
464 0)) == NULL) {
465 Fprintf(stderr,
466 "inet6_rth_init failed.\n");
467 exit(1);
468 }
469 }
470 if (inet6_rth_add((void *)rth,
471 (struct in6_addr *)hp->h_addr)) {
472 Fprintf(stderr,
473 "inet6_rth_add failed for %s\n",
474 optarg);
475 exit(1);
476 }
477 #else /* old advanced API */
478 if (cmsg == NULL)
479 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
480 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE);
481 #endif
482 freehostent(hp);
483 break;
484 case 'l':
485 lflag++;
486 break;
487 case 'm':
488 ep = NULL;
489 max_hops = strtoul(optarg, &ep, 0);
490 if (!*argv || *ep) {
491 Fprintf(stderr,
492 "traceroute6: invalid max hoplimit.\n");
493 exit(1);
494 }
495 if (max_hops < first_hop) {
496 Fprintf(stderr,
497 "traceroute6: max hoplimit must be >= %d.\n", first_hop);
498 exit(1);
499 }
500 break;
501 case 'n':
502 nflag++;
503 break;
504 case 'p':
505 ep = NULL;
506 port = strtoul(optarg, &ep, 0);
507 if (!*argv || *ep) {
508 Fprintf(stderr,
509 "traceroute6: port.\n");
510 exit(1);
511 }
512 if (port < 1) {
513 Fprintf(stderr,
514 "traceroute6: port must be >0.\n");
515 exit(1);
516 }
517 break;
518 case 'q':
519 ep = NULL;
520 nprobes = strtoul(optarg, &ep, 0);
521 if (!*argv || *ep) {
522 Fprintf(stderr,
523 "traceroute6: invalid nprobes.\n");
524 exit(1);
525 }
526 if (nprobes < 1) {
527 Fprintf(stderr,
528 "traceroute6: nprobes must be >0.\n");
529 exit(1);
530 }
531 break;
532 case 'r':
533 options |= SO_DONTROUTE;
534 break;
535 case 's':
536 /*
537 * set the ip source address of the outbound
538 * probe (e.g., on a multi-homed host).
539 */
540 source = optarg;
541 break;
542 case 'v':
543 verbose++;
544 break;
545 case 'w':
546 ep = NULL;
547 waittime = strtoul(optarg, &ep, 0);
548 if (!*argv || *ep) {
549 Fprintf(stderr,
550 "traceroute6: invalid wait time.\n");
551 exit(1);
552 }
553 if (waittime <= 1) {
554 Fprintf(stderr,
555 "traceroute6: wait must be >1 sec.\n");
556 exit(1);
557 }
558 break;
559 default:
560 usage();
561 }
562 argc -= optind;
563 argv += optind;
564
565 if (argc < 1 || argc > 2)
566 usage();
567
568 #if 1
569 setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
570 #else
571 setlinebuf (stdout);
572 #endif
573
574 memset(&hints, 0, sizeof(hints));
575 hints.ai_family = PF_INET6;
576 hints.ai_socktype = SOCK_RAW;
577 hints.ai_protocol = IPPROTO_ICMPV6;
578 hints.ai_flags = AI_CANONNAME;
579 error = getaddrinfo(*argv, NULL, &hints, &res);
580 if (error) {
581 (void)fprintf(stderr,
582 "traceroute6: %s\n", gai_strerror(error));
583 exit(1);
584 }
585 if (res->ai_addrlen != sizeof(Dst)) {
586 (void)fprintf(stderr,
587 "traceroute6: size of sockaddr mismatch\n");
588 exit(1);
589 }
590 memcpy(&Dst, res->ai_addr, res->ai_addrlen);
591 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
592 if (!hostname) {
593 (void)fprintf(stderr, "traceroute6: not enhough core\n");
594 exit(1);
595 }
596
597 if (*++argv) {
598 ep = NULL;
599 datalen = strtoul(*argv, &ep, 0);
600 if (!*argv || *ep) {
601 Fprintf(stderr,
602 "traceroute6: invalid packet length.\n");
603 exit(1);
604 }
605 }
606 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) {
607 Fprintf(stderr,
608 "traceroute6: packet size must be 0 <= s < %ld.\n",
609 (long)(MAXPACKET - sizeof(struct opacket)));
610 exit(1);
611 }
612 datalen += sizeof(struct opacket);
613 outpacket = (struct opacket *)malloc((unsigned)datalen);
614 if (! outpacket) {
615 perror("malloc");
616 exit(1);
617 }
618 (void) bzero((char *)outpacket, datalen);
619
620 /* initialize msghdr for receiving packets */
621 rcviov[0].iov_base = (caddr_t)packet;
622 rcviov[0].iov_len = sizeof(packet);
623 rcvmhdr.msg_name = (caddr_t)&Rcv;
624 rcvmhdr.msg_namelen = sizeof(Rcv);
625 rcvmhdr.msg_iov = rcviov;
626 rcvmhdr.msg_iovlen = 1;
627 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo))
628 + CMSG_SPACE(sizeof(int));
629 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
630 Fprintf(stderr, "traceroute6: malloc failed\n");
631 exit(1);
632 }
633 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
634 rcvmhdr.msg_controllen = rcvcmsglen;
635
636 if (options & SO_DEBUG)
637 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
638 (char *)&on, sizeof(on));
639 if (options & SO_DONTROUTE)
640 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
641 (char *)&on, sizeof(on));
642 #ifdef IPSEC
643 #ifdef IPSEC_POLICY_IPSEC
644 /*
645 * do not raise error even if setsockopt fails, kernel may have ipsec
646 * turned off.
647 */
648 if (setpolicy(rcvsock, "in bypass") < 0)
649 errx(1, "%s", ipsec_strerror());
650 if (setpolicy(rcvsock, "out bypass") < 0)
651 errx(1, "%s", ipsec_strerror());
652 #else
653 {
654 int level = IPSEC_LEVEL_NONE;
655
656 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
657 sizeof(level));
658 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
659 sizeof(level));
660 #ifdef IP_AUTH_TRANS_LEVEL
661 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
662 sizeof(level));
663 #else
664 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
665 sizeof(level));
666 #endif
667 #ifdef IP_AUTH_NETWORK_LEVEL
668 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
669 sizeof(level));
670 #endif
671 }
672 #endif /*IPSEC_POLICY_IPSEC*/
673 #endif /*IPSEC*/
674
675 /*
676 * Send UDP
677 */
678 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
679 perror("socket(SOCK_DGRAM)");
680 exit(5);
681 }
682 #ifdef SO_SNDBUF
683 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
684 sizeof(datalen)) < 0) {
685 perror("setsockopt(SO_SNDBUF)");
686 exit(6);
687 }
688 #endif /* SO_SNDBUF */
689 if (options & SO_DEBUG)
690 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
691 (char *)&on, sizeof(on));
692 if (options & SO_DONTROUTE)
693 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
694 (char *)&on, sizeof(on));
695 #ifdef USE_RFC2292BIS
696 if (rth) {/* XXX: there is no library to finalize the header... */
697 rth->ip6r_len = rth->ip6r_segleft * 2;
698 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR,
699 (void *)rth, (rth->ip6r_len + 1) << 3)) {
700 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n",
701 strerror(errno));
702 exit(1);
703 }
704 }
705 #else /* old advanced API */
706 if (cmsg != NULL) {
707 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
708 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
709 rtbuf, cmsg->cmsg_len) < 0) {
710 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n",
711 strerror(errno));
712 exit(1);
713 }
714 }
715 #endif /* USE_RFC2292BIS */
716 #ifdef IPSEC
717 #ifdef IPSEC_POLICY_IPSEC
718 /*
719 * do not raise error even if setsockopt fails, kernel may have ipsec
720 * turned off.
721 */
722 if (setpolicy(sndsock, "in bypass") < 0)
723 errx(1, "%s", ipsec_strerror());
724 if (setpolicy(sndsock, "out bypass") < 0)
725 errx(1, "%s", ipsec_strerror());
726 #else
727 {
728 int level = IPSEC_LEVEL_BYPASS;
729
730 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
731 sizeof(level));
732 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
733 sizeof(level));
734 #ifdef IP_AUTH_TRANS_LEVEL
735 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
736 sizeof(level));
737 #else
738 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
739 sizeof(level));
740 #endif
741 #ifdef IP_AUTH_NETWORK_LEVEL
742 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
743 sizeof(level));
744 #endif
745 }
746 #endif /*IPSEC_POLICY_IPSEC*/
747 #endif /*IPSEC*/
748
749 /*
750 * Source selection
751 */
752 bzero(&Src, sizeof(Src));
753 if (source) {
754 struct addrinfo hints, *res;
755 int error;
756
757 memset(&hints, 0, sizeof(hints));
758 hints.ai_family = AF_INET6;
759 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
760 hints.ai_flags = AI_NUMERICHOST;
761 error = getaddrinfo(source, "0", &hints, &res);
762 if (error) {
763 Printf("traceroute6: %s: %s\n", source,
764 gai_strerror(error));
765 exit(1);
766 }
767 if (res->ai_addrlen > sizeof(Src)) {
768 Printf("traceroute6: %s: %s\n", source,
769 gai_strerror(error));
770 exit(1);
771 }
772 memcpy(&Src, res->ai_addr, res->ai_addrlen);
773 freeaddrinfo(res);
774 } else {
775 struct sockaddr_in6 Nxt;
776 int dummy, len;
777
778 Nxt = Dst;
779 Nxt.sin6_port = htons(DUMMY_PORT);
780 if (cmsg != NULL)
781 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
782 sizeof(Nxt.sin6_addr));
783 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
784 perror("socket");
785 exit(1);
786 }
787 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
788 perror("connect");
789 exit(1);
790 }
791 len = sizeof(Src);
792 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
793 perror("getsockname");
794 exit(1);
795 }
796 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
797 src0, sizeof(src0), NULL, 0,
798 NI_NUMERICHOST | niflag)) {
799 Fprintf(stderr, "getnameinfo failed for source\n");
800 exit(1);
801 }
802 source = src0;
803 close(dummy);
804 }
805
806 #if 1
807 ident = (getpid() & 0xffff) | 0x8000;
808 #else
809 ident = 0; /*let the kernel pick one*/
810 #endif
811 Src.sin6_port = htons(ident);
812 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
813 perror("bind");
814 exit(1);
815 }
816
817 if (ident == 0) {
818 int len;
819
820 len = sizeof(Src);
821 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) {
822 perror("getsockname");
823 exit(1);
824 }
825 ident = ntohs(Src.sin6_port);
826 }
827
828 /*
829 * Message to users
830 */
831 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
832 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag))
833 strlcpy(hbuf, "(invalid)", sizeof(hbuf));
834 Fprintf(stderr, "traceroute6");
835 Fprintf(stderr, " to %s (%s)", hostname, hbuf);
836 if (source)
837 Fprintf(stderr, " from %s", source);
838 Fprintf(stderr,
839 ", %d hops max, %d byte packets\n",
840 max_hops, datalen);
841 (void) fflush(stderr);
842
843 if (first_hop > 1)
844 Printf("Skipping %d intermediate hops\n", first_hop - 1);
845
846 /*
847 * Main loop
848 */
849 for (hops = first_hop; hops <= max_hops; ++hops) {
850 struct in6_addr lastaddr;
851 int got_there = 0;
852 int unreachable = 0;
853
854 Printf("%2d ", hops);
855 bzero(&lastaddr, sizeof(lastaddr));
856 for (probe = 0; probe < nprobes; ++probe) {
857 int cc;
858 struct timeval t1, t2;
859 struct timezone tz;
860
861 (void) gettimeofday(&t1, &tz);
862 send_probe(++seq, hops);
863 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
864 (void) gettimeofday(&t2, &tz);
865 if ((i = packet_ok(&rcvmhdr, cc, seq))) {
866 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
867 &lastaddr)) {
868 print(&rcvmhdr, cc);
869 lastaddr = Rcv.sin6_addr;
870 }
871 Printf(" %g ms", deltaT(&t1, &t2));
872 switch(i - 1) {
873 case ICMP6_DST_UNREACH_NOROUTE:
874 ++unreachable;
875 Printf(" !N");
876 break;
877 case ICMP6_DST_UNREACH_ADMIN:
878 ++unreachable;
879 Printf(" !P");
880 break;
881 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
882 ++unreachable;
883 Printf(" !S");
884 break;
885 case ICMP6_DST_UNREACH_ADDR:
886 ++unreachable;
887 Printf(" !A");
888 break;
889 case ICMP6_DST_UNREACH_NOPORT:
890 if (rcvhlim >= 0 &&
891 rcvhlim <= 1)
892 Printf(" !");
893 ++got_there;
894 break;
895 }
896 break;
897 }
898 }
899 if (cc == 0)
900 Printf(" *");
901 (void) fflush(stdout);
902 }
903 putchar('\n');
904 if (got_there ||
905 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
906 exit(0);
907 }
908 }
909
910 exit(0);
911 }
912
913 int
914 wait_for_reply(sock, mhdr)
915 int sock;
916 struct msghdr *mhdr;
917 {
918 #ifdef HAVE_POLL
919 struct pollfd pfd[1];
920 int cc = 0;
921
922 pfd[0].fd = sock;
923 pfd[0].events = POLLIN;
924 pfd[0].revents = 0;
925
926 if (poll(pfd, 1, waittime * 1000) > 0)
927 cc = recvmsg(rcvsock, mhdr, 0);
928
929 return(cc);
930 #else
931 fd_set *fdsp;
932 struct timeval wait;
933 int cc = 0, fdsn;
934
935 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
936 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
937 err(1, "malloc");
938 memset(fdsp, 0, fdsn);
939 FD_SET(sock, fdsp);
940 wait.tv_sec = waittime; wait.tv_usec = 0;
941
942 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
943 cc = recvmsg(rcvsock, mhdr, 0);
944
945 free(fdsp);
946 return(cc);
947 #endif
948 }
949
950 #ifdef IPSEC
951 #ifdef IPSEC_POLICY_IPSEC
952 int
953 setpolicy(so, policy)
954 int so;
955 char *policy;
956 {
957 char *buf;
958
959 buf = ipsec_set_policy(policy, strlen(policy));
960 if (buf == NULL) {
961 warnx("%s", ipsec_strerror());
962 return -1;
963 }
964 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
965 buf, ipsec_get_policylen(buf));
966
967 free(buf);
968
969 return 0;
970 }
971 #endif
972 #endif
973
974 void
975 send_probe(seq, hops)
976 int seq, hops;
977 {
978 struct opacket *op = outpacket;
979 int i;
980
981 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
982 (char *)&hops, sizeof(hops)) < 0) {
983 perror("setsockopt IPV6_UNICAST_HOPS");
984 }
985
986 Dst.sin6_port = htons(port + seq);
987
988 op->seq = seq;
989 op->hops = hops;
990 (void) gettimeofday(&op->tv, &tz);
991
992 i = sendto(sndsock, (char *)outpacket, datalen , 0,
993 (struct sockaddr *)&Dst, Dst.sin6_len);
994 if (i < 0 || i != datalen) {
995 if (i<0)
996 perror("sendto");
997 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname,
998 datalen, i);
999 (void) fflush(stdout);
1000 }
1001 }
1002
1003 int
1004 get_hoplim(mhdr)
1005 struct msghdr *mhdr;
1006 {
1007 struct cmsghdr *cm;
1008
1009 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1010 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1011 if (cm->cmsg_level == IPPROTO_IPV6 &&
1012 cm->cmsg_type == IPV6_HOPLIMIT &&
1013 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1014 return(*(int *)CMSG_DATA(cm));
1015 }
1016
1017 return(-1);
1018 }
1019
1020 double
1021 deltaT(t1p, t2p)
1022 struct timeval *t1p, *t2p;
1023 {
1024 register double dt;
1025
1026 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
1027 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
1028 return (dt);
1029 }
1030
1031
1032 /*
1033 * Convert an ICMP "type" field to a printable string.
1034 */
1035 char *
1036 pr_type(t0)
1037 int t0;
1038 {
1039 u_char t = t0 & 0xff;
1040 char *cp;
1041
1042 switch (t) {
1043 case ICMP6_DST_UNREACH:
1044 cp = "Destination Unreachable";
1045 break;
1046 case ICMP6_PACKET_TOO_BIG:
1047 cp = "Pakcet Too Big";
1048 break;
1049 case ICMP6_TIME_EXCEEDED:
1050 cp = "Time Exceeded";
1051 break;
1052 case ICMP6_PARAM_PROB:
1053 cp = "Parameter Problem";
1054 break;
1055 case ICMP6_ECHO_REQUEST:
1056 cp = "Echo Request";
1057 break;
1058 case ICMP6_ECHO_REPLY:
1059 cp = "Echo Reply";
1060 break;
1061 case ICMP6_MEMBERSHIP_QUERY:
1062 cp = "Group Membership Query";
1063 break;
1064 case ICMP6_MEMBERSHIP_REPORT:
1065 cp = "Group Membership Report";
1066 break;
1067 case ICMP6_MEMBERSHIP_REDUCTION:
1068 cp = "Group Membership Reduction";
1069 break;
1070 case ND_ROUTER_SOLICIT:
1071 cp = "Router Solicitation";
1072 break;
1073 case ND_ROUTER_ADVERT:
1074 cp = "Router Advertisement";
1075 break;
1076 case ND_NEIGHBOR_SOLICIT:
1077 cp = "Neighbor Solicitation";
1078 break;
1079 case ND_NEIGHBOR_ADVERT:
1080 cp = "Neighbor Advertisement";
1081 break;
1082 case ND_REDIRECT:
1083 cp = "Redirect";
1084 break;
1085 default:
1086 cp = "Unknown";
1087 break;
1088 }
1089 return cp;
1090 }
1091
1092
1093 int
1094 packet_ok(mhdr, cc, seq)
1095 struct msghdr *mhdr;
1096 int cc;
1097 int seq;
1098 {
1099 register struct icmp6_hdr *icp;
1100 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1101 u_char type, code;
1102 char *buf = (char *)mhdr->msg_iov[0].iov_base;
1103 struct cmsghdr *cm;
1104 int *hlimp;
1105 char hbuf[NI_MAXHOST];
1106
1107 #ifdef OLDRAWSOCKET
1108 int hlen;
1109 struct ip6_hdr *ip;
1110 #endif
1111
1112 #ifdef OLDRAWSOCKET
1113 ip = (struct ip6_hdr *) buf;
1114 hlen = sizeof(struct ip6_hdr);
1115 if (cc < hlen + sizeof(struct icmp6_hdr)) {
1116 if (verbose) {
1117 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1118 hbuf, sizeof(hbuf), NULL, 0,
1119 NI_NUMERICHOST | niflag) != 0)
1120 strlcpy(hbuf, "invalid", sizeof(hbuf));
1121 Printf("packet too short (%d bytes) from %s\n", cc,
1122 hbuf);
1123 }
1124 return (0);
1125 }
1126 cc -= hlen;
1127 icp = (struct icmp6_hdr *)(buf + hlen);
1128 #else
1129 if (cc < sizeof(struct icmp6_hdr)) {
1130 if (verbose) {
1131 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1132 hbuf, sizeof(hbuf), NULL, 0,
1133 NI_NUMERICHOST | niflag) != 0)
1134 strlcpy(hbuf, "invalid", sizeof(hbuf));
1135 Printf("data too short (%d bytes) from %s\n", cc, hbuf);
1136 }
1137 return(0);
1138 }
1139 icp = (struct icmp6_hdr *)buf;
1140 #endif
1141 /* get optional information via advanced API */
1142 rcvpktinfo = NULL;
1143 hlimp = NULL;
1144 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1145 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1146 if (cm->cmsg_level == IPPROTO_IPV6 &&
1147 cm->cmsg_type == IPV6_PKTINFO &&
1148 cm->cmsg_len ==
1149 CMSG_LEN(sizeof(struct in6_pktinfo)))
1150 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
1151
1152 if (cm->cmsg_level == IPPROTO_IPV6 &&
1153 cm->cmsg_type == IPV6_HOPLIMIT &&
1154 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1155 hlimp = (int *)CMSG_DATA(cm);
1156 }
1157 if (rcvpktinfo == NULL || hlimp == NULL) {
1158 warnx("failed to get received hop limit or packet info");
1159 #if 0
1160 return(0);
1161 #else
1162 rcvhlim = 0; /*XXX*/
1163 #endif
1164 }
1165 else
1166 rcvhlim = *hlimp;
1167
1168 type = icp->icmp6_type;
1169 code = icp->icmp6_code;
1170 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
1171 || type == ICMP6_DST_UNREACH) {
1172 struct ip6_hdr *hip;
1173 struct udphdr *up;
1174
1175 hip = (struct ip6_hdr *)(icp + 1);
1176 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
1177 if (verbose)
1178 warnx("failed to get upper layer header");
1179 return(0);
1180 }
1181 if (up->uh_sport == htons(ident) &&
1182 up->uh_dport == htons(port+seq))
1183 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
1184 }
1185 if (verbose) {
1186 int i;
1187 u_int8_t *p;
1188 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
1189
1190 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1191 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
1192 strlcpy(sbuf, "invalid", sizeof(hbuf));
1193 Printf("\n%d bytes from %s to %s", cc, sbuf,
1194 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1195 dbuf, sizeof(dbuf))
1196 : "?");
1197 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
1198 icp->icmp6_code);
1199 p = (u_int8_t *)(icp + 1);
1200 #define WIDTH 16
1201 for (i = 0; i < cc; i++) {
1202 if (i % WIDTH == 0)
1203 Printf("%04x:", i);
1204 if (i % 4 == 0)
1205 Printf(" ");
1206 Printf("%02x", p[i]);
1207 if (i % WIDTH == WIDTH - 1)
1208 Printf("\n");
1209 }
1210 if (cc % WIDTH != 0)
1211 Printf("\n");
1212 }
1213 return(0);
1214 }
1215
1216 /*
1217 * Increment pointer until find the UDP header.
1218 */
1219 struct udphdr *
1220 get_udphdr(ip6, lim)
1221 struct ip6_hdr *ip6;
1222 u_char *lim;
1223 {
1224 u_char *cp = (u_char *)ip6, nh;
1225 int hlen;
1226
1227 if (cp + sizeof(*ip6) >= lim)
1228 return(NULL);
1229
1230 nh = ip6->ip6_nxt;
1231 cp += sizeof(struct ip6_hdr);
1232
1233 while(lim - cp >= 8) {
1234 switch(nh) {
1235 case IPPROTO_ESP:
1236 case IPPROTO_TCP:
1237 case IPPROTO_ICMPV6:
1238 return(NULL);
1239 case IPPROTO_UDP:
1240 return((struct udphdr *)cp);
1241 case IPPROTO_FRAGMENT:
1242 hlen = sizeof(struct ip6_frag);
1243 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
1244 break;
1245 case IPPROTO_AH:
1246 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
1247 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1248 break;
1249 default:
1250 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
1251 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1252 break;
1253 }
1254
1255 cp += hlen;
1256 }
1257
1258 return(NULL);
1259 }
1260
1261 void
1262 print(mhdr, cc)
1263 struct msghdr *mhdr;
1264 int cc;
1265 {
1266 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1267 char hbuf[NI_MAXHOST];
1268
1269 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1270 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
1271 strlcpy(hbuf, "invalid", sizeof(hbuf));
1272 if (nflag)
1273 Printf(" %s", hbuf);
1274 else if (lflag)
1275 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
1276 else
1277 Printf(" %s", inetname((struct sockaddr *)from));
1278
1279 if (verbose) {
1280 #ifdef OLDRAWSOCKET
1281 Printf(" %d bytes to %s", cc,
1282 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1283 hbuf, sizeof(hbuf))
1284 : "?");
1285 #else
1286 Printf(" %d bytes of data to %s", cc,
1287 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1288 hbuf, sizeof(hbuf))
1289 : "?");
1290 #endif
1291 }
1292 }
1293
1294 /*
1295 * Subtract 2 timeval structs: out = out - in.
1296 * Out is assumed to be >= in.
1297 */
1298 void
1299 tvsub(out, in)
1300 register struct timeval *out, *in;
1301 {
1302 if ((out->tv_usec -= in->tv_usec) < 0) {
1303 out->tv_sec--;
1304 out->tv_usec += 1000000;
1305 }
1306 out->tv_sec -= in->tv_sec;
1307 }
1308
1309
1310 /*
1311 * Construct an Internet address representation.
1312 * If the nflag has been supplied, give
1313 * numeric value, otherwise try for symbolic name.
1314 */
1315 const char *
1316 inetname(sa)
1317 struct sockaddr *sa;
1318 {
1319 register char *cp;
1320 static char line[NI_MAXHOST];
1321 static char domain[MAXHOSTNAMELEN + 1];
1322 static int first = 1;
1323
1324 if (first && !nflag) {
1325 first = 0;
1326 if (gethostname(domain, sizeof(domain)) == 0 &&
1327 (cp = index(domain, '.')))
1328 (void) strlcpy(domain, cp + 1, sizeof(domain));
1329 else
1330 domain[0] = 0;
1331 }
1332 cp = NULL;
1333 if (!nflag) {
1334 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1335 NI_NAMEREQD) == 0) {
1336 if ((cp = index(line, '.')) &&
1337 !strcmp(cp + 1, domain))
1338 *cp = 0;
1339 cp = line;
1340 }
1341 }
1342 if (cp)
1343 return cp;
1344
1345 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1346 NI_NUMERICHOST | niflag) != 0)
1347 strlcpy(line, "invalid", sizeof(line));
1348 return line;
1349 }
1350
1351 void
1352 usage()
1353 {
1354 (void)fprintf(stderr,
1355 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n"
1356 " [-q probes] [-s src] [-w waittime] target [datalen]\n");
1357 exit(1);
1358 }
1359