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1 /* $KAME: traceroute6.c,v 1.42 2001/05/08 04:36:41 itojun Exp $ */
2
3 /*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*-
33 * Copyright (c) 1990, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * This code is derived from software contributed to Berkeley by
37 * Van Jacobson.
38 *
39 * Redistribution and use in source and binary forms, with or without
40 * modification, are permitted provided that the following conditions
41 * are met:
42 * 1. Redistributions of source code must retain the above copyright
43 * notice, this list of conditions and the following disclaimer.
44 * 2. Redistributions in binary form must reproduce the above copyright
45 * notice, this list of conditions and the following disclaimer in the
46 * documentation and/or other materials provided with the distribution.
47 * 3. All advertising materials mentioning features or use of this software
48 * must display the following acknowledgement:
49 * This product includes software developed by the University of
50 * California, Berkeley and its contributors.
51 * 4. Neither the name of the University nor the names of its contributors
52 * may be used to endorse or promote products derived from this software
53 * without specific prior written permission.
54 *
55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
65 * SUCH DAMAGE.
66 */
67
68 #ifndef lint
69 static char copyright[] =
70 "@(#) Copyright (c) 1990, 1993\n\
71 The Regents of the University of California. All rights reserved.\n";
72 #endif /* not lint */
73
74 #ifndef lint
75 #if 0
76 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
77 #endif
78 static const char rcsid[] =
79 "$FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.4.2.4 2001/07/03 11:02:18 ume Exp $";
80 #endif /* not lint */
81
82 /*
83 * traceroute host - trace the route ip packets follow going to "host".
84 *
85 * Attempt to trace the route an ip packet would follow to some
86 * internet host. We find out intermediate hops by launching probe
87 * packets with a small ttl (time to live) then listening for an
88 * icmp "time exceeded" reply from a gateway. We start our probes
89 * with a ttl of one and increase by one until we get an icmp "port
90 * unreachable" (which means we got to "host") or hit a max (which
91 * defaults to 30 hops & can be changed with the -m flag). Three
92 * probes (change with -q flag) are sent at each ttl setting and a
93 * line is printed showing the ttl, address of the gateway and
94 * round trip time of each probe. If the probe answers come from
95 * different gateways, the address of each responding system will
96 * be printed. If there is no response within a 5 sec. timeout
97 * interval (changed with the -w flag), a "*" is printed for that
98 * probe.
99 *
100 * Probe packets are UDP format. We don't want the destination
101 * host to process them so the destination port is set to an
102 * unlikely value (if some clod on the destination is using that
103 * value, it can be changed with the -p flag).
104 *
105 * A sample use might be:
106 *
107 * [yak 71]% traceroute nis.nsf.net.
108 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
109 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
110 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
111 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
112 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
113 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
114 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
115 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
116 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
117 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
118 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
119 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
120 *
121 * Note that lines 2 & 3 are the same. This is due to a buggy
122 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
123 * packets with a zero ttl.
124 *
125 * A more interesting example is:
126 *
127 * [yak 72]% traceroute allspice.lcs.mit.edu.
128 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
129 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
130 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
131 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
132 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
133 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
134 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
135 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
136 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
137 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
138 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
139 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
140 * 12 * * *
141 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
142 * 14 * * *
143 * 15 * * *
144 * 16 * * *
145 * 17 * * *
146 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
147 *
148 * (I start to see why I'm having so much trouble with mail to
149 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
150 * either don't send ICMP "time exceeded" messages or send them
151 * with a ttl too small to reach us. 14 - 17 are running the
152 * MIT C Gateway code that doesn't send "time exceeded"s. God
153 * only knows what's going on with 12.
154 *
155 * The silent gateway 12 in the above may be the result of a bug in
156 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
157 * sends an unreachable message using whatever ttl remains in the
158 * original datagram. Since, for gateways, the remaining ttl is
159 * zero, the icmp "time exceeded" is guaranteed to not make it back
160 * to us. The behavior of this bug is slightly more interesting
161 * when it appears on the destination system:
162 *
163 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
164 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
165 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
166 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
167 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
168 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
169 * 7 * * *
170 * 8 * * *
171 * 9 * * *
172 * 10 * * *
173 * 11 * * *
174 * 12 * * *
175 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
176 *
177 * Notice that there are 12 "gateways" (13 is the final
178 * destination) and exactly the last half of them are "missing".
179 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
180 * is using the ttl from our arriving datagram as the ttl in its
181 * icmp reply. So, the reply will time out on the return path
182 * (with no notice sent to anyone since icmp's aren't sent for
183 * icmp's) until we probe with a ttl that's at least twice the path
184 * length. I.e., rip is really only 7 hops away. A reply that
185 * returns with a ttl of 1 is a clue this problem exists.
186 * Traceroute prints a "!" after the time if the ttl is <= 1.
187 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
188 * non-standard (HPUX) software, expect to see this problem
189 * frequently and/or take care picking the target host of your
190 * probes.
191 *
192 * Other possible annotations after the time are !H, !N, !P (got a host,
193 * network or protocol unreachable, respectively), !S or !F (source
194 * route failed or fragmentation needed -- neither of these should
195 * ever occur and the associated gateway is busted if you see one). If
196 * almost all the probes result in some kind of unreachable, traceroute
197 * will give up and exit.
198 *
199 * Notes
200 * -----
201 * This program must be run by root or be setuid. (I suggest that
202 * you *don't* make it setuid -- casual use could result in a lot
203 * of unnecessary traffic on our poor, congested nets.)
204 *
205 * This program requires a kernel mod that does not appear in any
206 * system available from Berkeley: A raw ip socket using proto
207 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
208 * opposed to data to be wrapped in a ip datagram). See the README
209 * file that came with the source to this program for a description
210 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
211 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
212 * MODIFIED TO RUN THIS PROGRAM.
213 *
214 * The udp port usage may appear bizarre (well, ok, it is bizarre).
215 * The problem is that an icmp message only contains 8 bytes of
216 * data from the original datagram. 8 bytes is the size of a udp
217 * header so, if we want to associate replies with the original
218 * datagram, the necessary information must be encoded into the
219 * udp header (the ip id could be used but there's no way to
220 * interlock with the kernel's assignment of ip id's and, anyway,
221 * it would have taken a lot more kernel hacking to allow this
222 * code to set the ip id). So, to allow two or more users to
223 * use traceroute simultaneously, we use this task's pid as the
224 * source port (the high bit is set to move the port number out
225 * of the "likely" range). To keep track of which probe is being
226 * replied to (so times and/or hop counts don't get confused by a
227 * reply that was delayed in transit), we increment the destination
228 * port number before each probe.
229 *
230 * Don't use this as a coding example. I was trying to find a
231 * routing problem and this code sort-of popped out after 48 hours
232 * without sleep. I was amazed it ever compiled, much less ran.
233 *
234 * I stole the idea for this program from Steve Deering. Since
235 * the first release, I've learned that had I attended the right
236 * IETF working group meetings, I also could have stolen it from Guy
237 * Almes or Matt Mathis. I don't know (or care) who came up with
238 * the idea first. I envy the originators' perspicacity and I'm
239 * glad they didn't keep the idea a secret.
240 *
241 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
242 * enhancements to the original distribution.
243 *
244 * I've hacked up a round-trip-route version of this that works by
245 * sending a loose-source-routed udp datagram through the destination
246 * back to yourself. Unfortunately, SO many gateways botch source
247 * routing, the thing is almost worthless. Maybe one day...
248 *
249 * -- Van Jacobson (van@helios.ee.lbl.gov)
250 * Tue Dec 20 03:50:13 PST 1988
251 */
252
253 #include <sys/param.h>
254 #include <sys/time.h>
255 #include <sys/socket.h>
256 #include <sys/uio.h>
257 #include <sys/file.h>
258 #include <sys/ioctl.h>
259
260 #include <netinet/in.h>
261
262 #include <arpa/inet.h>
263
264 #include <netdb.h>
265 #include <stdio.h>
266 #include <err.h>
267 #ifdef HAVE_POLL
268 #include <poll.h>
269 #endif
270 #include <errno.h>
271 #include <stdlib.h>
272 #include <string.h>
273 #include <unistd.h>
274
275 #include <netinet/ip6.h>
276 #include <netinet/icmp6.h>
277 #include <netinet/udp.h>
278
279 #ifdef IPSEC
280 #include <net/route.h>
281 #include <netinet6/ipsec.h>
282 #endif
283
284 #define DUMMY_PORT 10010
285
286 #define MAXPACKET 65535 /* max ip packet size */
287 #ifndef MAXHOSTNAMELEN
288 #define MAXHOSTNAMELEN 64
289 #endif
290
291 #ifndef FD_SET
292 #define NFDBITS (8*sizeof(fd_set))
293 #define FD_SETSIZE NFDBITS
294 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
295 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
296 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
297 #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
298 #endif
299
300 #define Fprintf (void)fprintf
301 #define Sprintf (void)sprintf
302 #define Printf (void)printf
303
304 #ifndef HAVE_GETIPNODEBYNAME
305 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
306 #define freehostent(x)
307 #endif
308
309 /*
310 * format of a (udp) probe packet.
311 */
312 struct opacket {
313 u_char seq; /* sequence number of this packet */
314 u_char hops; /* hop limit of the packet */
315 struct timeval tv; /* time packet left */
316 };
317
318 u_char packet[512]; /* last inbound (icmp) packet */
319 struct opacket *outpacket; /* last output (udp) packet */
320
321 int main __P((int, char *[]));
322 int wait_for_reply __P((int, struct msghdr *));
323 #ifdef IPSEC
324 #ifdef IPSEC_POLICY_IPSEC
325 int setpolicy __P((int so, char *policy));
326 #endif
327 #endif
328 void send_probe __P((int, int));
329 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *));
330 int get_hoplim __P((struct msghdr *));
331 double deltaT __P((struct timeval *, struct timeval *));
332 char *pr_type __P((int));
333 int packet_ok __P((struct msghdr *, int, int));
334 void print __P((struct msghdr *, int));
335 void tvsub __P((struct timeval *, struct timeval *));
336 const char *inetname __P((struct sockaddr *));
337 void usage __P((void));
338
339 int rcvsock; /* receive (icmp) socket file descriptor */
340 int sndsock; /* send (udp) socket file descriptor */
341 struct timezone tz; /* leftover */
342
343 struct msghdr rcvmhdr;
344 struct iovec rcviov[2];
345 int rcvhlim;
346 struct in6_pktinfo *rcvpktinfo;
347
348 struct sockaddr_in6 Src, Dst, Rcv;
349 int datalen; /* How much data */
350 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
351 char rtbuf[2064];
352 #ifdef USE_RFC2292BIS
353 struct ip6_rthdr *rth;
354 #endif
355 struct cmsghdr *cmsg;
356
357 char *source = 0;
358 char *hostname;
359
360 int nprobes = 3;
361 int first_hop = 1;
362 int max_hops = 30;
363 u_short ident;
364 u_short port = 32768+666; /* start udp dest port # for probe packets */
365 int options; /* socket options */
366 int verbose;
367 int waittime = 5; /* time to wait for response (in seconds) */
368 int nflag; /* print addresses numerically */
369 int lflag; /* print both numerical address & hostname */
370
371 #ifdef KAME_SCOPEID
372 const int niflag = NI_WITHSCOPEID;
373 #else
374 const int niflag = 0;
375 #endif
376
377 int
378 main(argc, argv)
379 int argc;
380 char *argv[];
381 {
382 struct hostent *hp;
383 int error;
384 struct addrinfo hints, *res;
385 int ch, i, on, probe, seq, hops, rcvcmsglen;
386 static u_char *rcvcmsgbuf;
387 char hbuf[NI_MAXHOST], src0[NI_MAXHOST];
388 char *ep;
389
390 /*
391 * Receive ICMP
392 */
393 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
394 perror("socket(ICMPv6)");
395 exit(5);
396 }
397
398 /* revoke privs */
399 seteuid(getuid());
400 setuid(getuid());
401
402 /* set a minimum set of socket options */
403 on = 1;
404 /* specify to tell receiving interface */
405 #ifdef IPV6_RECVPKTINFO
406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
407 sizeof(on)) < 0)
408 err(1, "setsockopt(IPV6_RECVPKTINFO)");
409 #else /* old adv. API */
410 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
411 sizeof(on)) < 0)
412 err(1, "setsockopt(IPV6_PKTINFO)");
413 #endif
414
415 /* specify to tell value of hoplimit field of received IP6 hdr */
416 #ifdef IPV6_RECVHOPLIMIT
417 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
418 sizeof(on)) < 0)
419 err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
420 #else /* old adv. API */
421 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
422 sizeof(on)) < 0)
423 err(1, "setsockopt(IPV6_HOPLIMIT)");
424 #endif
425
426 seq = 0;
427
428 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1)
429 switch(ch) {
430 case 'd':
431 options |= SO_DEBUG;
432 break;
433 case 'f':
434 ep = NULL;
435 first_hop = strtoul(optarg, &ep, 0);
436 if (!*argv || *ep) {
437 Fprintf(stderr,
438 "traceroute6: invalid min hoplimit.\n");
439 exit(1);
440 }
441 if (first_hop > max_hops) {
442 Fprintf(stderr,
443 "traceroute6: min hoplimit must be <= %d.\n", max_hops);
444 exit(1);
445 }
446 break;
447 case 'g':
448 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
449 if (hp == NULL) {
450 Fprintf(stderr,
451 "traceroute6: unknown host %s\n", optarg);
452 exit(1);
453 }
454 #ifdef USE_RFC2292BIS
455 if (rth == NULL) {
456 /*
457 * XXX: We can't detect the number of
458 * intermediate nodes yet.
459 */
460 if ((rth = inet6_rth_init((void *)rtbuf,
461 sizeof(rtbuf),
462 IPV6_RTHDR_TYPE_0,
463 0)) == NULL) {
464 Fprintf(stderr,
465 "inet6_rth_init failed.\n");
466 exit(1);
467 }
468 }
469 if (inet6_rth_add((void *)rth,
470 (struct in6_addr *)hp->h_addr)) {
471 Fprintf(stderr,
472 "inet6_rth_add failed for %s\n",
473 optarg);
474 exit(1);
475 }
476 #else /* old advanced API */
477 if (cmsg == NULL)
478 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
479 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE);
480 #endif
481 freehostent(hp);
482 break;
483 case 'l':
484 lflag++;
485 break;
486 case 'm':
487 ep = NULL;
488 max_hops = strtoul(optarg, &ep, 0);
489 if (!*argv || *ep) {
490 Fprintf(stderr,
491 "traceroute6: invalid max hoplimit.\n");
492 exit(1);
493 }
494 if (max_hops < first_hop) {
495 Fprintf(stderr,
496 "traceroute6: max hoplimit must be >= %d.\n", first_hop);
497 exit(1);
498 }
499 break;
500 case 'n':
501 nflag++;
502 break;
503 case 'p':
504 ep = NULL;
505 port = strtoul(optarg, &ep, 0);
506 if (!*argv || *ep) {
507 Fprintf(stderr,
508 "traceroute6: port.\n");
509 exit(1);
510 }
511 if (port < 1) {
512 Fprintf(stderr,
513 "traceroute6: port must be >0.\n");
514 exit(1);
515 }
516 break;
517 case 'q':
518 ep = NULL;
519 nprobes = strtoul(optarg, &ep, 0);
520 if (!*argv || *ep) {
521 Fprintf(stderr,
522 "traceroute6: invalid nprobes.\n");
523 exit(1);
524 }
525 if (nprobes < 1) {
526 Fprintf(stderr,
527 "traceroute6: nprobes must be >0.\n");
528 exit(1);
529 }
530 break;
531 case 'r':
532 options |= SO_DONTROUTE;
533 break;
534 case 's':
535 /*
536 * set the ip source address of the outbound
537 * probe (e.g., on a multi-homed host).
538 */
539 source = optarg;
540 break;
541 case 'v':
542 verbose++;
543 break;
544 case 'w':
545 ep = NULL;
546 waittime = strtoul(optarg, &ep, 0);
547 if (!*argv || *ep) {
548 Fprintf(stderr,
549 "traceroute6: invalid wait time.\n");
550 exit(1);
551 }
552 if (waittime <= 1) {
553 Fprintf(stderr,
554 "traceroute6: wait must be >1 sec.\n");
555 exit(1);
556 }
557 break;
558 default:
559 usage();
560 }
561 argc -= optind;
562 argv += optind;
563
564 if (argc < 1 || argc > 2)
565 usage();
566
567 #if 1
568 setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
569 #else
570 setlinebuf (stdout);
571 #endif
572
573 memset(&hints, 0, sizeof(hints));
574 hints.ai_family = PF_INET6;
575 hints.ai_socktype = SOCK_RAW;
576 hints.ai_protocol = IPPROTO_ICMPV6;
577 hints.ai_flags = AI_CANONNAME;
578 error = getaddrinfo(*argv, NULL, &hints, &res);
579 if (error) {
580 (void)fprintf(stderr,
581 "traceroute6: %s\n", gai_strerror(error));
582 exit(1);
583 }
584 if (res->ai_addrlen != sizeof(Dst)) {
585 (void)fprintf(stderr,
586 "traceroute6: size of sockaddr mismatch\n");
587 exit(1);
588 }
589 memcpy(&Dst, res->ai_addr, res->ai_addrlen);
590 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
591 if (!hostname) {
592 (void)fprintf(stderr, "traceroute6: not enough core\n");
593 exit(1);
594 }
595
596 if (*++argv) {
597 ep = NULL;
598 datalen = strtoul(*argv, &ep, 0);
599 if (!*argv || *ep) {
600 Fprintf(stderr,
601 "traceroute6: invalid packet length.\n");
602 exit(1);
603 }
604 }
605 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) {
606 Fprintf(stderr,
607 "traceroute6: packet size must be 0 <= s < %ld.\n",
608 (long)(MAXPACKET - sizeof(struct opacket)));
609 exit(1);
610 }
611 datalen += sizeof(struct opacket);
612 outpacket = (struct opacket *)malloc((unsigned)datalen);
613 if (! outpacket) {
614 perror("malloc");
615 exit(1);
616 }
617 (void) bzero((char *)outpacket, datalen);
618
619 /* initialize msghdr for receiving packets */
620 rcviov[0].iov_base = (caddr_t)packet;
621 rcviov[0].iov_len = sizeof(packet);
622 rcvmhdr.msg_name = (caddr_t)&Rcv;
623 rcvmhdr.msg_namelen = sizeof(Rcv);
624 rcvmhdr.msg_iov = rcviov;
625 rcvmhdr.msg_iovlen = 1;
626 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo))
627 + CMSG_SPACE(sizeof(int));
628 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
629 Fprintf(stderr, "traceroute6: malloc failed\n");
630 exit(1);
631 }
632 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
633 rcvmhdr.msg_controllen = rcvcmsglen;
634
635 if (options & SO_DEBUG)
636 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
637 (char *)&on, sizeof(on));
638 if (options & SO_DONTROUTE)
639 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
640 (char *)&on, sizeof(on));
641 #ifdef IPSEC
642 #ifdef IPSEC_POLICY_IPSEC
643 /*
644 * do not raise error even if setsockopt fails, kernel may have ipsec
645 * turned off.
646 */
647 if (setpolicy(rcvsock, "in bypass") < 0)
648 errx(1, "%s", ipsec_strerror());
649 if (setpolicy(rcvsock, "out bypass") < 0)
650 errx(1, "%s", ipsec_strerror());
651 #else
652 {
653 int level = IPSEC_LEVEL_NONE;
654
655 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
656 sizeof(level));
657 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
658 sizeof(level));
659 #ifdef IP_AUTH_TRANS_LEVEL
660 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
661 sizeof(level));
662 #else
663 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
664 sizeof(level));
665 #endif
666 #ifdef IP_AUTH_NETWORK_LEVEL
667 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
668 sizeof(level));
669 #endif
670 }
671 #endif /*IPSEC_POLICY_IPSEC*/
672 #endif /*IPSEC*/
673
674 /*
675 * Send UDP
676 */
677 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
678 perror("socket(SOCK_DGRAM)");
679 exit(5);
680 }
681 #ifdef SO_SNDBUF
682 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
683 sizeof(datalen)) < 0) {
684 perror("setsockopt(SO_SNDBUF)");
685 exit(6);
686 }
687 #endif /* SO_SNDBUF */
688 if (options & SO_DEBUG)
689 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
690 (char *)&on, sizeof(on));
691 if (options & SO_DONTROUTE)
692 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
693 (char *)&on, sizeof(on));
694 #ifdef USE_RFC2292BIS
695 if (rth) {/* XXX: there is no library to finalize the header... */
696 rth->ip6r_len = rth->ip6r_segleft * 2;
697 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR,
698 (void *)rth, (rth->ip6r_len + 1) << 3)) {
699 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n",
700 strerror(errno));
701 exit(1);
702 }
703 }
704 #else /* old advanced API */
705 if (cmsg != NULL) {
706 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
707 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
708 rtbuf, cmsg->cmsg_len) < 0) {
709 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n",
710 strerror(errno));
711 exit(1);
712 }
713 }
714 #endif /* USE_RFC2292BIS */
715 #ifdef IPSEC
716 #ifdef IPSEC_POLICY_IPSEC
717 /*
718 * do not raise error even if setsockopt fails, kernel may have ipsec
719 * turned off.
720 */
721 if (setpolicy(sndsock, "in bypass") < 0)
722 errx(1, "%s", ipsec_strerror());
723 if (setpolicy(sndsock, "out bypass") < 0)
724 errx(1, "%s", ipsec_strerror());
725 #else
726 {
727 int level = IPSEC_LEVEL_BYPASS;
728
729 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
730 sizeof(level));
731 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
732 sizeof(level));
733 #ifdef IP_AUTH_TRANS_LEVEL
734 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
735 sizeof(level));
736 #else
737 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
738 sizeof(level));
739 #endif
740 #ifdef IP_AUTH_NETWORK_LEVEL
741 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
742 sizeof(level));
743 #endif
744 }
745 #endif /*IPSEC_POLICY_IPSEC*/
746 #endif /*IPSEC*/
747
748 /*
749 * Source selection
750 */
751 bzero(&Src, sizeof(Src));
752 if (source) {
753 struct addrinfo hints, *res;
754 int error;
755
756 memset(&hints, 0, sizeof(hints));
757 hints.ai_family = AF_INET6;
758 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
759 hints.ai_flags = AI_NUMERICHOST;
760 error = getaddrinfo(source, "0", &hints, &res);
761 if (error) {
762 Printf("traceroute6: %s: %s\n", source,
763 gai_strerror(error));
764 exit(1);
765 }
766 if (res->ai_addrlen > sizeof(Src)) {
767 Printf("traceroute6: %s: %s\n", source,
768 gai_strerror(error));
769 exit(1);
770 }
771 memcpy(&Src, res->ai_addr, res->ai_addrlen);
772 freeaddrinfo(res);
773 } else {
774 struct sockaddr_in6 Nxt;
775 int dummy, len;
776
777 Nxt = Dst;
778 Nxt.sin6_port = htons(DUMMY_PORT);
779 if (cmsg != NULL)
780 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
781 sizeof(Nxt.sin6_addr));
782 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
783 perror("socket");
784 exit(1);
785 }
786 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
787 perror("connect");
788 exit(1);
789 }
790 len = sizeof(Src);
791 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
792 perror("getsockname");
793 exit(1);
794 }
795 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
796 src0, sizeof(src0), NULL, 0,
797 NI_NUMERICHOST | niflag)) {
798 Fprintf(stderr, "getnameinfo failed for source\n");
799 exit(1);
800 }
801 source = src0;
802 close(dummy);
803 }
804
805 #if 1
806 ident = (getpid() & 0xffff) | 0x8000;
807 #else
808 ident = 0; /*let the kernel pick one*/
809 #endif
810 Src.sin6_port = htons(ident);
811 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
812 perror("bind");
813 exit(1);
814 }
815
816 if (ident == 0) {
817 int len;
818
819 len = sizeof(Src);
820 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) {
821 perror("getsockname");
822 exit(1);
823 }
824 ident = ntohs(Src.sin6_port);
825 }
826
827 /*
828 * Message to users
829 */
830 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
831 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag))
832 strlcpy(hbuf, "(invalid)", sizeof(hbuf));
833 Fprintf(stderr, "traceroute6");
834 Fprintf(stderr, " to %s (%s)", hostname, hbuf);
835 if (source)
836 Fprintf(stderr, " from %s", source);
837 Fprintf(stderr,
838 ", %d hops max, %d byte packets\n",
839 max_hops, datalen);
840 (void) fflush(stderr);
841
842 if (first_hop > 1)
843 Printf("Skipping %d intermediate hops\n", first_hop - 1);
844
845 /*
846 * Main loop
847 */
848 for (hops = first_hop; hops <= max_hops; ++hops) {
849 struct in6_addr lastaddr;
850 int got_there = 0;
851 int unreachable = 0;
852
853 Printf("%2d ", hops);
854 bzero(&lastaddr, sizeof(lastaddr));
855 for (probe = 0; probe < nprobes; ++probe) {
856 int cc;
857 struct timeval t1, t2;
858 struct timezone tz;
859
860 (void) gettimeofday(&t1, &tz);
861 send_probe(++seq, hops);
862 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
863 (void) gettimeofday(&t2, &tz);
864 if ((i = packet_ok(&rcvmhdr, cc, seq))) {
865 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
866 &lastaddr)) {
867 print(&rcvmhdr, cc);
868 lastaddr = Rcv.sin6_addr;
869 }
870 Printf(" %g ms", deltaT(&t1, &t2));
871 switch(i - 1) {
872 case ICMP6_DST_UNREACH_NOROUTE:
873 ++unreachable;
874 Printf(" !N");
875 break;
876 case ICMP6_DST_UNREACH_ADMIN:
877 ++unreachable;
878 Printf(" !P");
879 break;
880 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
881 ++unreachable;
882 Printf(" !S");
883 break;
884 case ICMP6_DST_UNREACH_ADDR:
885 ++unreachable;
886 Printf(" !A");
887 break;
888 case ICMP6_DST_UNREACH_NOPORT:
889 if (rcvhlim >= 0 &&
890 rcvhlim <= 1)
891 Printf(" !");
892 ++got_there;
893 break;
894 }
895 break;
896 }
897 }
898 if (cc == 0)
899 Printf(" *");
900 (void) fflush(stdout);
901 }
902 putchar('\n');
903 if (got_there ||
904 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
905 exit(0);
906 }
907 }
908
909 exit(0);
910 }
911
912 int
913 wait_for_reply(sock, mhdr)
914 int sock;
915 struct msghdr *mhdr;
916 {
917 #ifdef HAVE_POLL
918 struct pollfd pfd[1];
919 int cc = 0;
920
921 pfd[0].fd = sock;
922 pfd[0].events = POLLIN;
923 pfd[0].revents = 0;
924
925 if (poll(pfd, 1, waittime * 1000) > 0)
926 cc = recvmsg(rcvsock, mhdr, 0);
927
928 return(cc);
929 #else
930 fd_set *fdsp;
931 struct timeval wait;
932 int cc = 0, fdsn;
933
934 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
935 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
936 err(1, "malloc");
937 memset(fdsp, 0, fdsn);
938 FD_SET(sock, fdsp);
939 wait.tv_sec = waittime; wait.tv_usec = 0;
940
941 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
942 cc = recvmsg(rcvsock, mhdr, 0);
943
944 free(fdsp);
945 return(cc);
946 #endif
947 }
948
949 #ifdef IPSEC
950 #ifdef IPSEC_POLICY_IPSEC
951 int
952 setpolicy(so, policy)
953 int so;
954 char *policy;
955 {
956 char *buf;
957
958 buf = ipsec_set_policy(policy, strlen(policy));
959 if (buf == NULL) {
960 warnx("%s", ipsec_strerror());
961 return -1;
962 }
963 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
964 buf, ipsec_get_policylen(buf));
965
966 free(buf);
967
968 return 0;
969 }
970 #endif
971 #endif
972
973 void
974 send_probe(seq, hops)
975 int seq, hops;
976 {
977 struct opacket *op = outpacket;
978 int i;
979
980 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
981 (char *)&hops, sizeof(hops)) < 0) {
982 perror("setsockopt IPV6_UNICAST_HOPS");
983 }
984
985 Dst.sin6_port = htons(port + seq);
986
987 op->seq = seq;
988 op->hops = hops;
989 (void) gettimeofday(&op->tv, &tz);
990
991 i = sendto(sndsock, (char *)outpacket, datalen , 0,
992 (struct sockaddr *)&Dst, Dst.sin6_len);
993 if (i < 0 || i != datalen) {
994 if (i<0)
995 perror("sendto");
996 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname,
997 datalen, i);
998 (void) fflush(stdout);
999 }
1000 }
1001
1002 int
1003 get_hoplim(mhdr)
1004 struct msghdr *mhdr;
1005 {
1006 struct cmsghdr *cm;
1007
1008 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1009 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1010 if (cm->cmsg_level == IPPROTO_IPV6 &&
1011 cm->cmsg_type == IPV6_HOPLIMIT &&
1012 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1013 return(*(int *)CMSG_DATA(cm));
1014 }
1015
1016 return(-1);
1017 }
1018
1019 double
1020 deltaT(t1p, t2p)
1021 struct timeval *t1p, *t2p;
1022 {
1023 register double dt;
1024
1025 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
1026 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
1027 return (dt);
1028 }
1029
1030
1031 /*
1032 * Convert an ICMP "type" field to a printable string.
1033 */
1034 char *
1035 pr_type(t0)
1036 int t0;
1037 {
1038 u_char t = t0 & 0xff;
1039 char *cp;
1040
1041 switch (t) {
1042 case ICMP6_DST_UNREACH:
1043 cp = "Destination Unreachable";
1044 break;
1045 case ICMP6_PACKET_TOO_BIG:
1046 cp = "Pakcet Too Big";
1047 break;
1048 case ICMP6_TIME_EXCEEDED:
1049 cp = "Time Exceeded";
1050 break;
1051 case ICMP6_PARAM_PROB:
1052 cp = "Parameter Problem";
1053 break;
1054 case ICMP6_ECHO_REQUEST:
1055 cp = "Echo Request";
1056 break;
1057 case ICMP6_ECHO_REPLY:
1058 cp = "Echo Reply";
1059 break;
1060 case ICMP6_MEMBERSHIP_QUERY:
1061 cp = "Group Membership Query";
1062 break;
1063 case ICMP6_MEMBERSHIP_REPORT:
1064 cp = "Group Membership Report";
1065 break;
1066 case ICMP6_MEMBERSHIP_REDUCTION:
1067 cp = "Group Membership Reduction";
1068 break;
1069 case ND_ROUTER_SOLICIT:
1070 cp = "Router Solicitation";
1071 break;
1072 case ND_ROUTER_ADVERT:
1073 cp = "Router Advertisement";
1074 break;
1075 case ND_NEIGHBOR_SOLICIT:
1076 cp = "Neighbor Solicitation";
1077 break;
1078 case ND_NEIGHBOR_ADVERT:
1079 cp = "Neighbor Advertisement";
1080 break;
1081 case ND_REDIRECT:
1082 cp = "Redirect";
1083 break;
1084 default:
1085 cp = "Unknown";
1086 break;
1087 }
1088 return cp;
1089 }
1090
1091
1092 int
1093 packet_ok(mhdr, cc, seq)
1094 struct msghdr *mhdr;
1095 int cc;
1096 int seq;
1097 {
1098 register struct icmp6_hdr *icp;
1099 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1100 u_char type, code;
1101 char *buf = (char *)mhdr->msg_iov[0].iov_base;
1102 struct cmsghdr *cm;
1103 int *hlimp;
1104 char hbuf[NI_MAXHOST];
1105
1106 #ifdef OLDRAWSOCKET
1107 int hlen;
1108 struct ip6_hdr *ip;
1109 #endif
1110
1111 #ifdef OLDRAWSOCKET
1112 ip = (struct ip6_hdr *) buf;
1113 hlen = sizeof(struct ip6_hdr);
1114 if (cc < hlen + sizeof(struct icmp6_hdr)) {
1115 if (verbose) {
1116 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1117 hbuf, sizeof(hbuf), NULL, 0,
1118 NI_NUMERICHOST | niflag) != 0)
1119 strlcpy(hbuf, "invalid", sizeof(hbuf));
1120 Printf("packet too short (%d bytes) from %s\n", cc,
1121 hbuf);
1122 }
1123 return (0);
1124 }
1125 cc -= hlen;
1126 icp = (struct icmp6_hdr *)(buf + hlen);
1127 #else
1128 if (cc < sizeof(struct icmp6_hdr)) {
1129 if (verbose) {
1130 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1131 hbuf, sizeof(hbuf), NULL, 0,
1132 NI_NUMERICHOST | niflag) != 0)
1133 strlcpy(hbuf, "invalid", sizeof(hbuf));
1134 Printf("data too short (%d bytes) from %s\n", cc, hbuf);
1135 }
1136 return(0);
1137 }
1138 icp = (struct icmp6_hdr *)buf;
1139 #endif
1140 /* get optional information via advanced API */
1141 rcvpktinfo = NULL;
1142 hlimp = NULL;
1143 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1144 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1145 if (cm->cmsg_level == IPPROTO_IPV6 &&
1146 cm->cmsg_type == IPV6_PKTINFO &&
1147 cm->cmsg_len ==
1148 CMSG_LEN(sizeof(struct in6_pktinfo)))
1149 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
1150
1151 if (cm->cmsg_level == IPPROTO_IPV6 &&
1152 cm->cmsg_type == IPV6_HOPLIMIT &&
1153 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1154 hlimp = (int *)CMSG_DATA(cm);
1155 }
1156 if (rcvpktinfo == NULL || hlimp == NULL) {
1157 warnx("failed to get received hop limit or packet info");
1158 #if 0
1159 return(0);
1160 #else
1161 rcvhlim = 0; /*XXX*/
1162 #endif
1163 }
1164 else
1165 rcvhlim = *hlimp;
1166
1167 type = icp->icmp6_type;
1168 code = icp->icmp6_code;
1169 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
1170 || type == ICMP6_DST_UNREACH) {
1171 struct ip6_hdr *hip;
1172 struct udphdr *up;
1173
1174 hip = (struct ip6_hdr *)(icp + 1);
1175 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
1176 if (verbose)
1177 warnx("failed to get upper layer header");
1178 return(0);
1179 }
1180 if (up->uh_sport == htons(ident) &&
1181 up->uh_dport == htons(port+seq))
1182 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
1183 }
1184 if (verbose) {
1185 int i;
1186 u_int8_t *p;
1187 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
1188
1189 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1190 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
1191 strlcpy(sbuf, "invalid", sizeof(hbuf));
1192 Printf("\n%d bytes from %s to %s", cc, sbuf,
1193 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1194 dbuf, sizeof(dbuf))
1195 : "?");
1196 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
1197 icp->icmp6_code);
1198 p = (u_int8_t *)(icp + 1);
1199 #define WIDTH 16
1200 for (i = 0; i < cc; i++) {
1201 if (i % WIDTH == 0)
1202 Printf("%04x:", i);
1203 if (i % 4 == 0)
1204 Printf(" ");
1205 Printf("%02x", p[i]);
1206 if (i % WIDTH == WIDTH - 1)
1207 Printf("\n");
1208 }
1209 if (cc % WIDTH != 0)
1210 Printf("\n");
1211 }
1212 return(0);
1213 }
1214
1215 /*
1216 * Increment pointer until find the UDP header.
1217 */
1218 struct udphdr *
1219 get_udphdr(ip6, lim)
1220 struct ip6_hdr *ip6;
1221 u_char *lim;
1222 {
1223 u_char *cp = (u_char *)ip6, nh;
1224 int hlen;
1225
1226 if (cp + sizeof(*ip6) >= lim)
1227 return(NULL);
1228
1229 nh = ip6->ip6_nxt;
1230 cp += sizeof(struct ip6_hdr);
1231
1232 while(lim - cp >= 8) {
1233 switch(nh) {
1234 case IPPROTO_ESP:
1235 case IPPROTO_TCP:
1236 case IPPROTO_ICMPV6:
1237 return(NULL);
1238 case IPPROTO_UDP:
1239 return((struct udphdr *)cp);
1240 case IPPROTO_FRAGMENT:
1241 hlen = sizeof(struct ip6_frag);
1242 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
1243 break;
1244 case IPPROTO_AH:
1245 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
1246 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1247 break;
1248 default:
1249 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
1250 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1251 break;
1252 }
1253
1254 cp += hlen;
1255 }
1256
1257 return(NULL);
1258 }
1259
1260 void
1261 print(mhdr, cc)
1262 struct msghdr *mhdr;
1263 int cc;
1264 {
1265 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1266 char hbuf[NI_MAXHOST];
1267
1268 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1269 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
1270 strlcpy(hbuf, "invalid", sizeof(hbuf));
1271 if (nflag)
1272 Printf(" %s", hbuf);
1273 else if (lflag)
1274 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
1275 else
1276 Printf(" %s", inetname((struct sockaddr *)from));
1277
1278 if (verbose) {
1279 #ifdef OLDRAWSOCKET
1280 Printf(" %d bytes to %s", cc,
1281 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1282 hbuf, sizeof(hbuf))
1283 : "?");
1284 #else
1285 Printf(" %d bytes of data to %s", cc,
1286 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1287 hbuf, sizeof(hbuf))
1288 : "?");
1289 #endif
1290 }
1291 }
1292
1293 /*
1294 * Subtract 2 timeval structs: out = out - in.
1295 * Out is assumed to be >= in.
1296 */
1297 void
1298 tvsub(out, in)
1299 register struct timeval *out, *in;
1300 {
1301 if ((out->tv_usec -= in->tv_usec) < 0) {
1302 out->tv_sec--;
1303 out->tv_usec += 1000000;
1304 }
1305 out->tv_sec -= in->tv_sec;
1306 }
1307
1308
1309 /*
1310 * Construct an Internet address representation.
1311 * If the nflag has been supplied, give
1312 * numeric value, otherwise try for symbolic name.
1313 */
1314 const char *
1315 inetname(sa)
1316 struct sockaddr *sa;
1317 {
1318 register char *cp;
1319 static char line[NI_MAXHOST];
1320 static char domain[MAXHOSTNAMELEN + 1];
1321 static int first = 1;
1322
1323 if (first && !nflag) {
1324 first = 0;
1325 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
1326 (cp = index(domain, '.')))
1327 (void) strlcpy(domain, cp + 1, sizeof(domain));
1328 else
1329 domain[0] = 0;
1330 }
1331 cp = NULL;
1332 if (!nflag) {
1333 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1334 NI_NAMEREQD) == 0) {
1335 if ((cp = index(line, '.')) &&
1336 !strcmp(cp + 1, domain))
1337 *cp = 0;
1338 cp = line;
1339 }
1340 }
1341 if (cp)
1342 return cp;
1343
1344 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1345 NI_NUMERICHOST | niflag) != 0)
1346 strlcpy(line, "invalid", sizeof(line));
1347 return line;
1348 }
1349
1350 void
1351 usage()
1352 {
1353 (void)fprintf(stderr,
1354 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n"
1355 " [-q probes] [-s src] [-w waittime] target [datalen]\n");
1356 exit(1);
1357 }
mirror of network_cmds