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get mxge to build, stage 29/many
[dragonfly.git] / usr.sbin / traceroute6 / traceroute6.c
blob8ae3cdb8c99650a29744a4db64ccb953ca2d6bcf
1 /* $KAME: traceroute6.c,v 1.68 2004/01/25 11:16:12 suz 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 * "@(#) Copyright (c) 1990, 1993
68 * The Regents of the University of California. All rights reserved.
69 *
70 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.22 2008/02/10 21:06:38 dwmalone Exp $
71 * $DragonFly: src/usr.sbin/traceroute6/traceroute6.c,v 1.9 2008/09/04 09:08:22 hasso Exp $
72 */
73
74 /*
75 * traceroute host - trace the route ip packets follow going to "host".
76 *
77 * Attempt to trace the route an ip packet would follow to some
78 * internet host. We find out intermediate hops by launching probe
79 * packets with a small ttl (time to live) then listening for an
80 * icmp "time exceeded" reply from a gateway. We start our probes
81 * with a ttl of one and increase by one until we get an icmp "port
82 * unreachable" (which means we got to "host") or hit a max (which
83 * defaults to 30 hops & can be changed with the -m flag). Three
84 * probes (change with -q flag) are sent at each ttl setting and a
85 * line is printed showing the ttl, address of the gateway and
86 * round trip time of each probe. If the probe answers come from
87 * different gateways, the address of each responding system will
88 * be printed. If there is no response within a 5 sec. timeout
89 * interval (changed with the -w flag), a "*" is printed for that
90 * probe.
91 *
92 * Probe packets are UDP format. We don't want the destination
93 * host to process them so the destination port is set to an
94 * unlikely value (if some clod on the destination is using that
95 * value, it can be changed with the -p flag).
96 *
97 * A sample use might be:
98 *
99 * [yak 71]% traceroute nis.nsf.net.
100 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
101 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
102 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
103 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
104 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
105 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
106 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
107 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
108 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
109 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
110 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
111 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
112 *
113 * Note that lines 2 & 3 are the same. This is due to a buggy
114 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
115 * packets with a zero ttl.
116 *
117 * A more interesting example is:
118 *
119 * [yak 72]% traceroute allspice.lcs.mit.edu.
120 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
121 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
122 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
123 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
124 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
125 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
126 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
127 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
128 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
129 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
130 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
131 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
132 * 12 * * *
133 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
134 * 14 * * *
135 * 15 * * *
136 * 16 * * *
137 * 17 * * *
138 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
139 *
140 * (I start to see why I'm having so much trouble with mail to
141 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
142 * either don't send ICMP "time exceeded" messages or send them
143 * with a ttl too small to reach us. 14 - 17 are running the
144 * MIT C Gateway code that doesn't send "time exceeded"s. God
145 * only knows what's going on with 12.
146 *
147 * The silent gateway 12 in the above may be the result of a bug in
148 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
149 * sends an unreachable message using whatever ttl remains in the
150 * original datagram. Since, for gateways, the remaining ttl is
151 * zero, the icmp "time exceeded" is guaranteed to not make it back
152 * to us. The behavior of this bug is slightly more interesting
153 * when it appears on the destination system:
154 *
155 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
156 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
157 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
158 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
159 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
160 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
161 * 7 * * *
162 * 8 * * *
163 * 9 * * *
164 * 10 * * *
165 * 11 * * *
166 * 12 * * *
167 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
168 *
169 * Notice that there are 12 "gateways" (13 is the final
170 * destination) and exactly the last half of them are "missing".
171 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
172 * is using the ttl from our arriving datagram as the ttl in its
173 * icmp reply. So, the reply will time out on the return path
174 * (with no notice sent to anyone since icmp's aren't sent for
175 * icmp's) until we probe with a ttl that's at least twice the path
176 * length. I.e., rip is really only 7 hops away. A reply that
177 * returns with a ttl of 1 is a clue this problem exists.
178 * Traceroute prints a "!" after the time if the ttl is <= 1.
179 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
180 * non-standard (HPUX) software, expect to see this problem
181 * frequently and/or take care picking the target host of your
182 * probes.
183 *
184 * Other possible annotations after the time are !H, !N, !P (got a host,
185 * network or protocol unreachable, respectively), !S or !F (source
186 * route failed or fragmentation needed -- neither of these should
187 * ever occur and the associated gateway is busted if you see one). If
188 * almost all the probes result in some kind of unreachable, traceroute
189 * will give up and exit.
190 *
191 * Notes
192 * -----
193 * This program must be run by root or be setuid. (I suggest that
194 * you *don't* make it setuid -- casual use could result in a lot
195 * of unnecessary traffic on our poor, congested nets.)
196 *
197 * This program requires a kernel mod that does not appear in any
198 * system available from Berkeley: A raw ip socket using proto
199 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
200 * opposed to data to be wrapped in an ip datagram). See the README
201 * file that came with the source to this program for a description
202 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
203 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
204 * MODIFIED TO RUN THIS PROGRAM.
205 *
206 * The udp port usage may appear bizarre (well, ok, it is bizarre).
207 * The problem is that an icmp message only contains 8 bytes of
208 * data from the original datagram. 8 bytes is the size of a udp
209 * header so, if we want to associate replies with the original
210 * datagram, the necessary information must be encoded into the
211 * udp header (the ip id could be used but there's no way to
212 * interlock with the kernel's assignment of ip id's and, anyway,
213 * it would have taken a lot more kernel hacking to allow this
214 * code to set the ip id). So, to allow two or more users to
215 * use traceroute simultaneously, we use this task's pid as the
216 * source port (the high bit is set to move the port number out
217 * of the "likely" range). To keep track of which probe is being
218 * replied to (so times and/or hop counts don't get confused by a
219 * reply that was delayed in transit), we increment the destination
220 * port number before each probe.
221 *
222 * Don't use this as a coding example. I was trying to find a
223 * routing problem and this code sort-of popped out after 48 hours
224 * without sleep. I was amazed it ever compiled, much less ran.
225 *
226 * I stole the idea for this program from Steve Deering. Since
227 * the first release, I've learned that had I attended the right
228 * IETF working group meetings, I also could have stolen it from Guy
229 * Almes or Matt Mathis. I don't know (or care) who came up with
230 * the idea first. I envy the originators' perspicacity and I'm
231 * glad they didn't keep the idea a secret.
232 *
233 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
234 * enhancements to the original distribution.
235 *
236 * I've hacked up a round-trip-route version of this that works by
237 * sending a loose-source-routed udp datagram through the destination
238 * back to yourself. Unfortunately, SO many gateways botch source
239 * routing, the thing is almost worthless. Maybe one day...
240 *
241 * -- Van Jacobson (van@helios.ee.lbl.gov)
242 * Tue Dec 20 03:50:13 PST 1988
243 */
244
245 #include <sys/param.h>
246 #include <sys/time.h>
247 #include <sys/socket.h>
248 #include <sys/uio.h>
249 #include <sys/file.h>
250 #include <sys/ioctl.h>
251 #include <sys/sysctl.h>
252
253 #include <netinet/in.h>
254
255 #include <arpa/inet.h>
256
257 #include <netdb.h>
258 #include <stdio.h>
259 #include <err.h>
260 #ifdef HAVE_POLL
261 #include <poll.h>
262 #endif
263 #include <errno.h>
264 #include <stdlib.h>
265 #include <string.h>
266 #include <unistd.h>
267
268 #include <netinet/ip6.h>
269 #include <netinet/icmp6.h>
270 #include <netinet/udp.h>
271
272 #ifdef IPSEC
273 #include <net/route.h>
274 #include <netinet6/ipsec.h>
275 #endif
276
277 #define DUMMY_PORT 10010
278
279 #define MAXPACKET 65535 /* max ip packet size */
280
281 #ifndef HAVE_GETIPNODEBYNAME
282 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
283 #define freehostent(x)
284 #endif
285
286 /*
287 * format of a (udp) probe packet.
288 */
289 struct tv32 {
290 u_int32_t tv32_sec;
291 u_int32_t tv32_usec;
292 };
293
294 struct opacket {
295 u_char seq; /* sequence number of this packet */
296 u_char hops; /* hop limit of the packet */
297 u_char pad[2];
298 struct tv32 tv; /* time packet left */
299 } __attribute__((__packed__));
300
301 u_char packet[512]; /* last inbound (icmp) packet */
302 struct opacket *outpacket; /* last output (udp) packet */
303
304 int main(int, char *[]);
305 int wait_for_reply(int, struct msghdr *);
306 #ifdef IPSEC
307 #ifdef IPSEC_POLICY_IPSEC
308 int setpolicy(int so, char *policy);
309 #endif
310 #endif
311 void send_probe(int, u_long);
312 void *get_uphdr(struct ip6_hdr *, u_char *);
313 int get_hoplim(struct msghdr *);
314 double deltaT(struct timeval *, struct timeval *);
315 char *pr_type(int);
316 int packet_ok(struct msghdr *, int, int);
317 void print(struct msghdr *, int);
318 const char *inetname(struct sockaddr *);
319 void usage(void);
320
321 int rcvsock; /* receive (icmp) socket file descriptor */
322 int sndsock; /* send (udp) socket file descriptor */
323
324 struct msghdr rcvmhdr;
325 struct iovec rcviov[2];
326 int rcvhlim;
327 struct in6_pktinfo *rcvpktinfo;
328
329 struct sockaddr_in6 Src, Dst, Rcv;
330 u_long datalen; /* How much data */
331 #define ICMP6ECHOLEN 8
332 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
333 char rtbuf[2064];
334
335 char *source = 0;
336 char *hostname;
337
338 u_long nprobes = 3;
339 u_long first_hop = 1;
340 u_long max_hops = 30;
341 u_int16_t srcport;
342 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */
343 u_int16_t ident;
344 int options; /* socket options */
345 int verbose;
346 int waittime = 5; /* time to wait for response (in seconds) */
347 int nflag; /* print addresses numerically */
348 int useproto = IPPROTO_UDP; /* protocol to use to send packet */
349 int lflag; /* print both numerical address & hostname */
350
351 int
352 main(int argc, char **argv)
353 {
354 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM };
355 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep;
356 int ch, i, on = 1, seq, rcvcmsglen, error, minlen;
357 struct addrinfo hints, *res;
358 static u_char *rcvcmsgbuf;
359 u_long probe, hops, lport;
360 struct hostent *hp;
361 size_t size;
362 uid_t uid;
363
364 /*
365 * Receive ICMP
366 */
367 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
368 perror("socket(ICMPv6)");
369 exit(5);
370 }
371
372 size = sizeof(i);
373 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0);
374 max_hops = i;
375
376 /* specify to tell receiving interface */
377 #ifdef IPV6_RECVPKTINFO
378 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
379 sizeof(on)) < 0)
380 err(1, "setsockopt(IPV6_RECVPKTINFO)");
381 #else /* old adv. API */
382 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
383 sizeof(on)) < 0)
384 err(1, "setsockopt(IPV6_PKTINFO)");
385 #endif
386
387 /* specify to tell value of hoplimit field of received IP6 hdr */
388 #ifdef IPV6_RECVHOPLIMIT
389 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
390 sizeof(on)) < 0)
391 err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
392 #else /* old adv. API */
393 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
394 sizeof(on)) < 0)
395 err(1, "setsockopt(IPV6_HOPLIMIT)");
396 #endif
397
398 seq = 0;
399
400 while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1)
401 switch (ch) {
402 case 'd':
403 options |= SO_DEBUG;
404 break;
405 case 'f':
406 ep = NULL;
407 errno = 0;
408 first_hop = strtoul(optarg, &ep, 0);
409 if (errno || !*optarg || *ep || first_hop > 255) {
410 fprintf(stderr,
411 "traceroute6: invalid min hoplimit.\n");
412 exit(1);
413 }
414 break;
415 case 'g':
416 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
417 if (hp == NULL) {
418 fprintf(stderr,
419 "traceroute6: unknown host %s\n", optarg);
420 exit(1);
421 }
422 freehostent(hp);
423 break;
424 case 'I':
425 useproto = IPPROTO_ICMPV6;
426 ident = htons(getpid() & 0xffff); /* same as ping6 */
427 break;
428 case 'l':
429 lflag++;
430 break;
431 case 'm':
432 ep = NULL;
433 errno = 0;
434 max_hops = strtoul(optarg, &ep, 0);
435 if (errno || !*optarg || *ep || max_hops > 255) {
436 fprintf(stderr,
437 "traceroute6: invalid max hoplimit.\n");
438 exit(1);
439 }
440 break;
441 case 'n':
442 nflag++;
443 break;
444 case 'N':
445 useproto = IPPROTO_NONE;
446 break;
447 case 'p':
448 ep = NULL;
449 errno = 0;
450 lport = strtoul(optarg, &ep, 0);
451 if (errno || !*optarg || *ep) {
452 fprintf(stderr, "traceroute6: invalid port.\n");
453 exit(1);
454 }
455 if (lport == 0 || lport != (lport & 0xffff)) {
456 fprintf(stderr,
457 "traceroute6: port out of range.\n");
458 exit(1);
459 }
460 port = lport & 0xffff;
461 break;
462 case 'q':
463 ep = NULL;
464 errno = 0;
465 nprobes = strtoul(optarg, &ep, 0);
466 if (errno || !*optarg || *ep) {
467 fprintf(stderr,
468 "traceroute6: invalid nprobes.\n");
469 exit(1);
470 }
471 if (nprobes < 1) {
472 fprintf(stderr,
473 "traceroute6: nprobes must be >0.\n");
474 exit(1);
475 }
476 break;
477 case 'r':
478 options |= SO_DONTROUTE;
479 break;
480 case 's':
481 /*
482 * set the ip source address of the outbound
483 * probe (e.g., on a multi-homed host).
484 */
485 source = optarg;
486 break;
487 case 'v':
488 verbose++;
489 break;
490 case 'U':
491 useproto = IPPROTO_UDP;
492 break;
493 case 'w':
494 ep = NULL;
495 errno = 0;
496 waittime = strtoul(optarg, &ep, 0);
497 if (errno || !*optarg || *ep) {
498 fprintf(stderr,
499 "traceroute6: invalid wait time.\n");
500 exit(1);
501 }
502 if (waittime < 1) {
503 fprintf(stderr,
504 "traceroute6: wait must be >= 1 sec.\n");
505 exit(1);
506 }
507 break;
508 default:
509 usage();
510 }
511 argc -= optind;
512 argv += optind;
513
514 /*
515 * Open socket to send probe packets.
516 */
517 switch (useproto) {
518 case IPPROTO_ICMPV6:
519 sndsock = rcvsock;
520 break;
521 case IPPROTO_UDP:
522 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
523 perror("socket(SOCK_DGRAM)");
524 exit(5);
525 }
526 break;
527 case IPPROTO_NONE:
528 if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) {
529 perror("socket(SOCK_RAW)");
530 exit(5);
531 }
532 break;
533 default:
534 fprintf(stderr, "traceroute6: unknown probe protocol %d",
535 useproto);
536 exit(5);
537 }
538 if (max_hops < first_hop) {
539 fprintf(stderr,
540 "traceroute6: max hoplimit must be larger than first hoplimit.\n");
541 exit(1);
542 }
543
544 /* revoke privs */
545 uid = getuid();
546 if (setresuid(uid, uid, uid) == -1) {
547 perror("setresuid");
548 exit(1);
549 }
550
551
552 if (argc < 1 || argc > 2)
553 usage();
554
555 #if 1
556 setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
557 #else
558 setlinebuf(stdout);
559 #endif
560
561 memset(&hints, 0, sizeof(hints));
562 hints.ai_family = PF_INET6;
563 hints.ai_socktype = SOCK_RAW;
564 hints.ai_protocol = IPPROTO_ICMPV6;
565 hints.ai_flags = AI_CANONNAME;
566 error = getaddrinfo(*argv, NULL, &hints, &res);
567 if (error) {
568 fprintf(stderr,
569 "traceroute6: %s\n", gai_strerror(error));
570 exit(1);
571 }
572 if (res->ai_addrlen != sizeof(Dst)) {
573 fprintf(stderr,
574 "traceroute6: size of sockaddr mismatch\n");
575 exit(1);
576 }
577 memcpy(&Dst, res->ai_addr, res->ai_addrlen);
578 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
579 if (!hostname) {
580 fprintf(stderr, "traceroute6: not enough core\n");
581 exit(1);
582 }
583 if (res->ai_next) {
584 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf,
585 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
586 strlcpy(hbuf, "?", sizeof(hbuf));
587 fprintf(stderr, "traceroute6: Warning: %s has multiple "
588 "addresses; using %s\n", hostname, hbuf);
589 }
590
591 if (*++argv) {
592 ep = NULL;
593 errno = 0;
594 datalen = strtoul(*argv, &ep, 0);
595 if (errno || !*argv || *ep) {
596 fprintf(stderr,
597 "traceroute6: invalid packet length.\n");
598 exit(1);
599 }
600 }
601 switch (useproto) {
602 case IPPROTO_ICMPV6:
603 minlen = ICMP6ECHOLEN + sizeof(struct tv32);
604 break;
605 case IPPROTO_UDP:
606 minlen = sizeof(struct opacket);
607 break;
608 case IPPROTO_NONE:
609 minlen = 0;
610 datalen = 0;
611 break;
612 default:
613 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n",
614 useproto);
615 exit(1);
616 }
617 if (datalen < minlen)
618 datalen = minlen;
619 else if (datalen >= MAXPACKET) {
620 fprintf(stderr,
621 "traceroute6: packet size must be %d <= s < %ld.\n",
622 minlen, (long)MAXPACKET);
623 exit(1);
624 }
625 outpacket = (struct opacket *)malloc((unsigned)datalen);
626 if (!outpacket) {
627 perror("malloc");
628 exit(1);
629 }
630 (void) bzero((char *)outpacket, datalen);
631
632 /* initialize msghdr for receiving packets */
633 rcviov[0].iov_base = (caddr_t)packet;
634 rcviov[0].iov_len = sizeof(packet);
635 rcvmhdr.msg_name = (caddr_t)&Rcv;
636 rcvmhdr.msg_namelen = sizeof(Rcv);
637 rcvmhdr.msg_iov = rcviov;
638 rcvmhdr.msg_iovlen = 1;
639 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
640 CMSG_SPACE(sizeof(int));
641 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
642 fprintf(stderr, "traceroute6: malloc failed\n");
643 exit(1);
644 }
645 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
646 rcvmhdr.msg_controllen = rcvcmsglen;
647
648 if (options & SO_DEBUG)
649 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
650 (char *)&on, sizeof(on));
651 if (options & SO_DONTROUTE)
652 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
653 (char *)&on, sizeof(on));
654 #ifdef IPSEC
655 #ifdef IPSEC_POLICY_IPSEC
656 /*
657 * do not raise error even if setsockopt fails, kernel may have ipsec
658 * turned off.
659 */
660 if (setpolicy(rcvsock, "in bypass") < 0)
661 errx(1, "%s", ipsec_strerror());
662 if (setpolicy(rcvsock, "out bypass") < 0)
663 errx(1, "%s", ipsec_strerror());
664 #else
665 {
666 int level = IPSEC_LEVEL_NONE;
667
668 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
669 sizeof(level));
670 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
671 sizeof(level));
672 #ifdef IP_AUTH_TRANS_LEVEL
673 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
674 sizeof(level));
675 #else
676 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
677 sizeof(level));
678 #endif
679 #ifdef IP_AUTH_NETWORK_LEVEL
680 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
681 sizeof(level));
682 #endif
683 }
684 #endif /*IPSEC_POLICY_IPSEC*/
685 #endif /*IPSEC*/
686
687 #ifdef SO_SNDBUF
688 i = datalen;
689 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i,
690 sizeof(i)) < 0 && useproto != IPPROTO_NONE) {
691 perror("setsockopt(SO_SNDBUF)");
692 exit(6);
693 }
694 #endif /* SO_SNDBUF */
695 if (options & SO_DEBUG)
696 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
697 (char *)&on, sizeof(on));
698 if (options & SO_DONTROUTE)
699 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
700 (char *)&on, sizeof(on));
701 #ifdef IPSEC
702 #ifdef IPSEC_POLICY_IPSEC
703 /*
704 * do not raise error even if setsockopt fails, kernel may have ipsec
705 * turned off.
706 */
707 if (setpolicy(sndsock, "in bypass") < 0)
708 errx(1, "%s", ipsec_strerror());
709 if (setpolicy(sndsock, "out bypass") < 0)
710 errx(1, "%s", ipsec_strerror());
711 #else
712 {
713 int level = IPSEC_LEVEL_BYPASS;
714
715 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
716 sizeof(level));
717 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
718 sizeof(level));
719 #ifdef IP_AUTH_TRANS_LEVEL
720 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
721 sizeof(level));
722 #else
723 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
724 sizeof(level));
725 #endif
726 #ifdef IP_AUTH_NETWORK_LEVEL
727 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
728 sizeof(level));
729 #endif
730 }
731 #endif /*IPSEC_POLICY_IPSEC*/
732 #endif /*IPSEC*/
733
734 /*
735 * Source selection
736 */
737 bzero(&Src, sizeof(Src));
738 if (source) {
739 struct addrinfo hints, *res;
740 int error;
741
742 memset(&hints, 0, sizeof(hints));
743 hints.ai_family = AF_INET6;
744 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
745 hints.ai_flags = AI_NUMERICHOST;
746 error = getaddrinfo(source, "0", &hints, &res);
747 if (error) {
748 printf("traceroute6: %s: %s\n", source,
749 gai_strerror(error));
750 exit(1);
751 }
752 if (res->ai_addrlen > sizeof(Src)) {
753 printf("traceroute6: %s: %s\n", source,
754 gai_strerror(error));
755 exit(1);
756 }
757 memcpy(&Src, res->ai_addr, res->ai_addrlen);
758 freeaddrinfo(res);
759 } else {
760 struct sockaddr_in6 Nxt;
761 int dummy;
762 socklen_t len;
763
764 Nxt = Dst;
765 Nxt.sin6_port = htons(DUMMY_PORT);
766 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
767 perror("socket");
768 exit(1);
769 }
770 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
771 perror("connect");
772 exit(1);
773 }
774 len = sizeof(Src);
775 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
776 perror("getsockname");
777 exit(1);
778 }
779 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
780 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) {
781 fprintf(stderr, "getnameinfo failed for source\n");
782 exit(1);
783 }
784 source = src0;
785 close(dummy);
786 }
787
788 Src.sin6_port = htons(0);
789 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
790 perror("bind");
791 exit(1);
792 }
793
794 {
795 socklen_t len;
796
797 len = sizeof(Src);
798 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) {
799 perror("getsockname");
800 exit(1);
801 }
802 srcport = ntohs(Src.sin6_port);
803 }
804
805 /*
806 * Message to users
807 */
808 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
809 sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
810 strlcpy(hbuf, "(invalid)", sizeof(hbuf));
811 fprintf(stderr, "traceroute6");
812 fprintf(stderr, " to %s (%s)", hostname, hbuf);
813 if (source)
814 fprintf(stderr, " from %s", source);
815 fprintf(stderr, ", %lu hops max, %lu byte packets\n",
816 max_hops, datalen);
817 (void) fflush(stderr);
818
819 if (first_hop > 1)
820 printf("Skipping %lu intermediate hops\n", first_hop - 1);
821
822 /*
823 * Main loop
824 */
825 for (hops = first_hop; hops <= max_hops; ++hops) {
826 struct in6_addr lastaddr;
827 int got_there = 0;
828 int unreachable = 0;
829
830 printf("%2lu ", hops);
831 bzero(&lastaddr, sizeof(lastaddr));
832 for (probe = 0; probe < nprobes; ++probe) {
833 int cc;
834 struct timeval t1, t2;
835
836 (void) gettimeofday(&t1, NULL);
837 send_probe(++seq, hops);
838 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
839 (void) gettimeofday(&t2, NULL);
840 if ((i = packet_ok(&rcvmhdr, cc, seq))) {
841 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
842 &lastaddr)) {
843 if (probe > 0)
844 fputs("\n ", stdout);
845 print(&rcvmhdr, cc);
846 lastaddr = Rcv.sin6_addr;
847 }
848 printf(" %.3f ms", deltaT(&t1, &t2));
849 switch (i - 1) {
850 case ICMP6_DST_UNREACH_NOROUTE:
851 ++unreachable;
852 printf(" !N");
853 break;
854 case ICMP6_DST_UNREACH_ADMIN:
855 ++unreachable;
856 printf(" !P");
857 break;
858 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
859 ++unreachable;
860 printf(" !S");
861 break;
862 case ICMP6_DST_UNREACH_ADDR:
863 ++unreachable;
864 printf(" !A");
865 break;
866 case ICMP6_DST_UNREACH_NOPORT:
867 if (rcvhlim >= 0 &&
868 rcvhlim <= 1)
869 printf(" !");
870 ++got_there;
871 break;
872 }
873 break;
874 }
875 }
876 if (cc == 0)
877 printf(" *");
878 (void) fflush(stdout);
879 }
880 putchar('\n');
881 if (got_there ||
882 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
883 exit(0);
884 }
885 }
886
887 exit(0);
888 }
889
890 int
891 wait_for_reply(int sock, struct msghdr *mhdr)
892 {
893 #ifdef HAVE_POLL
894 struct pollfd pfd[1];
895 int cc = 0;
896
897 pfd[0].fd = sock;
898 pfd[0].events = POLLIN;
899 pfd[0].revents = 0;
900
901 if (poll(pfd, 1, waittime * 1000) > 0)
902 cc = recvmsg(rcvsock, mhdr, 0);
903
904 return(cc);
905 #else
906 fd_set *fdsp;
907 struct timeval wait;
908 int cc = 0, fdsn;
909
910 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
911 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
912 err(1, "malloc");
913 memset(fdsp, 0, fdsn);
914 FD_SET(sock, fdsp);
915 wait.tv_sec = waittime; wait.tv_usec = 0;
916
917 if (select(sock+1, fdsp, NULL, NULL, &wait) > 0)
918 cc = recvmsg(rcvsock, mhdr, 0);
919
920 free(fdsp);
921 return(cc);
922 #endif
923 }
924
925 #ifdef IPSEC
926 #ifdef IPSEC_POLICY_IPSEC
927 int
928 setpolicy(int so, char *policy)
929 {
930 char *buf;
931
932 buf = ipsec_set_policy(policy, strlen(policy));
933 if (buf == NULL) {
934 warnx("%s", ipsec_strerror());
935 return -1;
936 }
937 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
938 buf, ipsec_get_policylen(buf));
939
940 free(buf);
941
942 return 0;
943 }
944 #endif
945 #endif
946
947 void
948 send_probe(int seq, u_long hops)
949 {
950 struct icmp6_hdr *icp;
951 struct opacket *op;
952 struct timeval tv;
953 struct tv32 tv32;
954 int i;
955
956 i = hops;
957 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
958 (char *)&i, sizeof(i)) < 0) {
959 perror("setsockopt IPV6_UNICAST_HOPS");
960 }
961
962 Dst.sin6_port = htons(port + seq);
963 (void) gettimeofday(&tv, NULL);
964 tv32.tv32_sec = htonl(tv.tv_sec);
965 tv32.tv32_usec = htonl(tv.tv_usec);
966
967 switch (useproto) {
968 case IPPROTO_ICMPV6:
969 icp = (struct icmp6_hdr *)outpacket;
970
971 icp->icmp6_type = ICMP6_ECHO_REQUEST;
972 icp->icmp6_code = 0;
973 icp->icmp6_cksum = 0;
974 icp->icmp6_id = ident;
975 icp->icmp6_seq = htons(seq);
976 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN),
977 sizeof(tv32));
978 break;
979 case IPPROTO_UDP:
980 op = outpacket;
981
982 op->seq = seq;
983 op->hops = hops;
984 bcopy(&tv32, &op->tv, sizeof tv32);
985 break;
986 case IPPROTO_NONE:
987 /* No space for anything. No harm as seq/tv32 are decorative. */
988 break;
989 default:
990 fprintf(stderr, "Unknown probe protocol %d.\n", useproto);
991 exit(1);
992 }
993
994 i = sendto(sndsock, (char *)outpacket, datalen, 0,
995 (struct sockaddr *)&Dst, Dst.sin6_len);
996 if (i < 0 || i != datalen) {
997 if (i < 0)
998 perror("sendto");
999 printf("traceroute6: wrote %s %lu chars, ret=%d\n",
1000 hostname, datalen, i);
1001 (void) fflush(stdout);
1002 }
1003 }
1004
1005 int
1006 get_hoplim(struct msghdr *mhdr)
1007 {
1008 struct cmsghdr *cm;
1009
1010 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1011 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1012 if (cm->cmsg_level == IPPROTO_IPV6 &&
1013 cm->cmsg_type == IPV6_HOPLIMIT &&
1014 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1015 return(*(int *)CMSG_DATA(cm));
1016 }
1017
1018 return(-1);
1019 }
1020
1021 double
1022 deltaT(struct timeval *t1p, struct timeval *t2p)
1023 {
1024 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 * Convert an ICMP "type" field to a printable string.
1033 */
1034 char *
1035 pr_type(int t0)
1036 {
1037 u_char t = t0 & 0xff;
1038 char *cp;
1039
1040 switch (t) {
1041 case ICMP6_DST_UNREACH:
1042 cp = "Destination Unreachable";
1043 break;
1044 case ICMP6_PACKET_TOO_BIG:
1045 cp = "Packet Too Big";
1046 break;
1047 case ICMP6_TIME_EXCEEDED:
1048 cp = "Time Exceeded";
1049 break;
1050 case ICMP6_PARAM_PROB:
1051 cp = "Parameter Problem";
1052 break;
1053 case ICMP6_ECHO_REQUEST:
1054 cp = "Echo Request";
1055 break;
1056 case ICMP6_ECHO_REPLY:
1057 cp = "Echo Reply";
1058 break;
1059 case ICMP6_MEMBERSHIP_QUERY:
1060 cp = "Group Membership Query";
1061 break;
1062 case ICMP6_MEMBERSHIP_REPORT:
1063 cp = "Group Membership Report";
1064 break;
1065 case ICMP6_MEMBERSHIP_REDUCTION:
1066 cp = "Group Membership Reduction";
1067 break;
1068 case ND_ROUTER_SOLICIT:
1069 cp = "Router Solicitation";
1070 break;
1071 case ND_ROUTER_ADVERT:
1072 cp = "Router Advertisement";
1073 break;
1074 case ND_NEIGHBOR_SOLICIT:
1075 cp = "Neighbor Solicitation";
1076 break;
1077 case ND_NEIGHBOR_ADVERT:
1078 cp = "Neighbor Advertisement";
1079 break;
1080 case ND_REDIRECT:
1081 cp = "Redirect";
1082 break;
1083 default:
1084 cp = "Unknown";
1085 break;
1086 }
1087 return cp;
1088 }
1089
1090 int
1091 packet_ok(struct msghdr *mhdr, int cc, int seq)
1092 {
1093 struct icmp6_hdr *icp;
1094 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1095 u_char type, code;
1096 char *buf = (char *)mhdr->msg_iov[0].iov_base;
1097 struct cmsghdr *cm;
1098 int *hlimp;
1099 char hbuf[NI_MAXHOST];
1100
1101 #ifdef OLDRAWSOCKET
1102 int hlen;
1103 struct ip6_hdr *ip;
1104 #endif
1105
1106 #ifdef OLDRAWSOCKET
1107 ip = (struct ip6_hdr *) buf;
1108 hlen = sizeof(struct ip6_hdr);
1109 if (cc < hlen + sizeof(struct icmp6_hdr)) {
1110 if (verbose) {
1111 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1112 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1113 strlcpy(hbuf, "invalid", sizeof(hbuf));
1114 printf("packet too short (%d bytes) from %s\n", cc,
1115 hbuf);
1116 }
1117 return (0);
1118 }
1119 cc -= hlen;
1120 icp = (struct icmp6_hdr *)(buf + hlen);
1121 #else
1122 if (cc < sizeof(struct icmp6_hdr)) {
1123 if (verbose) {
1124 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1125 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1126 strlcpy(hbuf, "invalid", sizeof(hbuf));
1127 printf("data too short (%d bytes) from %s\n", cc, hbuf);
1128 }
1129 return(0);
1130 }
1131 icp = (struct icmp6_hdr *)buf;
1132 #endif
1133 /* get optional information via advanced API */
1134 rcvpktinfo = NULL;
1135 hlimp = NULL;
1136 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1137 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1138 if (cm->cmsg_level == IPPROTO_IPV6 &&
1139 cm->cmsg_type == IPV6_PKTINFO &&
1140 cm->cmsg_len ==
1141 CMSG_LEN(sizeof(struct in6_pktinfo)))
1142 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
1143
1144 if (cm->cmsg_level == IPPROTO_IPV6 &&
1145 cm->cmsg_type == IPV6_HOPLIMIT &&
1146 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1147 hlimp = (int *)CMSG_DATA(cm);
1148 }
1149 if (rcvpktinfo == NULL || hlimp == NULL) {
1150 warnx("failed to get received hop limit or packet info");
1151 #if 0
1152 return(0);
1153 #else
1154 rcvhlim = 0; /*XXX*/
1155 #endif
1156 }
1157 else
1158 rcvhlim = *hlimp;
1159
1160 type = icp->icmp6_type;
1161 code = icp->icmp6_code;
1162 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
1163 || type == ICMP6_DST_UNREACH) {
1164 struct ip6_hdr *hip;
1165 void *up;
1166
1167 hip = (struct ip6_hdr *)(icp + 1);
1168 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) {
1169 if (verbose)
1170 warnx("failed to get upper layer header");
1171 return(0);
1172 }
1173 switch (useproto) {
1174 case IPPROTO_ICMPV6:
1175 if (((struct icmp6_hdr *)up)->icmp6_id == ident &&
1176 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq))
1177 return (type == ICMP6_TIME_EXCEEDED ?
1178 -1 : code + 1);
1179 break;
1180 case IPPROTO_UDP:
1181 if (((struct udphdr *)up)->uh_sport == htons(srcport) &&
1182 ((struct udphdr *)up)->uh_dport == htons(port + seq))
1183 return (type == ICMP6_TIME_EXCEEDED ?
1184 -1 : code + 1);
1185 break;
1186 case IPPROTO_NONE:
1187 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
1188 default:
1189 fprintf(stderr, "Unknown probe proto %d.\n", useproto);
1190 break;
1191 }
1192 } else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) {
1193 if (icp->icmp6_id == ident &&
1194 icp->icmp6_seq == htons(seq))
1195 return (ICMP6_DST_UNREACH_NOPORT + 1);
1196 }
1197 if (verbose) {
1198 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
1199 u_int8_t *p;
1200 int i;
1201
1202 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1203 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0)
1204 strlcpy(sbuf, "invalid", sizeof(sbuf));
1205 printf("\n%d bytes from %s to %s", cc, sbuf,
1206 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1207 dbuf, sizeof(dbuf)) : "?");
1208 printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
1209 icp->icmp6_code);
1210 p = (u_int8_t *)(icp + 1);
1211 #define WIDTH 16
1212 for (i = 0; i < cc; i++) {
1213 if (i % WIDTH == 0)
1214 printf("%04x:", i);
1215 if (i % 4 == 0)
1216 printf(" ");
1217 printf("%02x", p[i]);
1218 if (i % WIDTH == WIDTH - 1)
1219 printf("\n");
1220 }
1221 if (cc % WIDTH != 0)
1222 printf("\n");
1223 }
1224 return(0);
1225 }
1226
1227 /*
1228 * Increment pointer until find the UDP or ICMP header.
1229 */
1230 void *
1231 get_uphdr(struct ip6_hdr *ip6, u_char *lim)
1232 {
1233 u_char *cp = (u_char *)ip6, nh;
1234 int hlen;
1235 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */
1236
1237 if (cp + sizeof(*ip6) > lim)
1238 return(NULL);
1239
1240 nh = ip6->ip6_nxt;
1241 cp += sizeof(struct ip6_hdr);
1242
1243 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) {
1244 switch (nh) {
1245 case IPPROTO_ESP:
1246 case IPPROTO_TCP:
1247 return(NULL);
1248 case IPPROTO_ICMPV6:
1249 return(useproto == nh ? cp : NULL);
1250 case IPPROTO_UDP:
1251 return(useproto == nh ? cp : NULL);
1252 case IPPROTO_NONE:
1253 return(useproto == nh ? none_hdr : NULL);
1254 case IPPROTO_FRAGMENT:
1255 hlen = sizeof(struct ip6_frag);
1256 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
1257 break;
1258 case IPPROTO_AH:
1259 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
1260 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1261 break;
1262 default:
1263 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
1264 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1265 break;
1266 }
1267
1268 cp += hlen;
1269 }
1270
1271 return(NULL);
1272 }
1273
1274 void
1275 print(struct msghdr *mhdr, int cc)
1276 {
1277 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1278 char hbuf[NI_MAXHOST];
1279
1280 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1281 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1282 strlcpy(hbuf, "invalid", sizeof(hbuf));
1283 if (nflag)
1284 printf(" %s", hbuf);
1285 else if (lflag)
1286 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
1287 else
1288 printf(" %s", inetname((struct sockaddr *)from));
1289
1290 if (verbose) {
1291 #ifdef OLDRAWSOCKET
1292 printf(" %d bytes to %s", cc,
1293 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1294 hbuf, sizeof(hbuf)) : "?");
1295 #else
1296 printf(" %d bytes of data to %s", cc,
1297 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1298 hbuf, sizeof(hbuf)) : "?");
1299 #endif
1300 }
1301 }
1302
1303 /*
1304 * Construct an Internet address representation.
1305 * If the nflag has been supplied, give
1306 * numeric value, otherwise try for symbolic name.
1307 */
1308 const char *
1309 inetname(struct sockaddr *sa)
1310 {
1311 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1];
1312 static int first = 1;
1313 char *cp;
1314
1315 if (first && !nflag) {
1316 first = 0;
1317 if (gethostname(domain, sizeof(domain)) == 0 &&
1318 (cp = strchr(domain, '.')))
1319 (void) strlcpy(domain, cp + 1, sizeof(domain));
1320 else
1321 domain[0] = 0;
1322 }
1323 cp = NULL;
1324 if (!nflag) {
1325 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1326 NI_NAMEREQD) == 0) {
1327 if ((cp = strchr(line, '.')) &&
1328 !strcmp(cp + 1, domain))
1329 *cp = 0;
1330 cp = line;
1331 }
1332 }
1333 if (cp)
1334 return cp;
1335
1336 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1337 NI_NUMERICHOST) != 0)
1338 strlcpy(line, "invalid", sizeof(line));
1339 return line;
1340 }
1341
1342 void
1343 usage(void)
1344 {
1345
1346 fprintf(stderr,
1347 "usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n"
1348 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n");
1349 exit(1);
1350 }
DragonFly BSD