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kernel - Remove cache ping-pong on common scheduler operations
[dragonfly.git] / usr.sbin / traceroute6 / traceroute6.c
blobd42a7ec46a2c959404f2e928fe1f383a657a9556
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. Neither the name of the University nor the names of its contributors
48 * may be used to endorse or promote products derived from this software
49 * without specific prior written permission.
50 *
51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
61 * SUCH DAMAGE.
62 *
63 * "@(#) Copyright (c) 1990, 1993
64 * The Regents of the University of California. All rights reserved.
65 *
66 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.22 2008/02/10 21:06:38 dwmalone Exp $
67 */
68
69 /*
70 * traceroute host - trace the route ip packets follow going to "host".
71 *
72 * Attempt to trace the route an ip packet would follow to some
73 * internet host. We find out intermediate hops by launching probe
74 * packets with a small ttl (time to live) then listening for an
75 * icmp "time exceeded" reply from a gateway. We start our probes
76 * with a ttl of one and increase by one until we get an icmp "port
77 * unreachable" (which means we got to "host") or hit a max (which
78 * defaults to 30 hops & can be changed with the -m flag). Three
79 * probes (change with -q flag) are sent at each ttl setting and a
80 * line is printed showing the ttl, address of the gateway and
81 * round trip time of each probe. If the probe answers come from
82 * different gateways, the address of each responding system will
83 * be printed. If there is no response within a 5 sec. timeout
84 * interval (changed with the -w flag), a "*" is printed for that
85 * probe.
86 *
87 * Probe packets are UDP format. We don't want the destination
88 * host to process them so the destination port is set to an
89 * unlikely value (if some clod on the destination is using that
90 * value, it can be changed with the -p flag).
91 *
92 * A sample use might be:
93 *
94 * [yak 71]% traceroute nis.nsf.net.
95 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
96 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
97 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
98 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
99 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
100 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
101 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
102 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
103 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
104 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
105 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
106 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
107 *
108 * Note that lines 2 & 3 are the same. This is due to a buggy
109 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
110 * packets with a zero ttl.
111 *
112 * A more interesting example is:
113 *
114 * [yak 72]% traceroute allspice.lcs.mit.edu.
115 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
116 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
117 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
118 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
119 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
120 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
121 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
122 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
123 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
124 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
125 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
126 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
127 * 12 * * *
128 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
129 * 14 * * *
130 * 15 * * *
131 * 16 * * *
132 * 17 * * *
133 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
134 *
135 * (I start to see why I'm having so much trouble with mail to
136 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
137 * either don't send ICMP "time exceeded" messages or send them
138 * with a ttl too small to reach us. 14 - 17 are running the
139 * MIT C Gateway code that doesn't send "time exceeded"s. God
140 * only knows what's going on with 12.
141 *
142 * The silent gateway 12 in the above may be the result of a bug in
143 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
144 * sends an unreachable message using whatever ttl remains in the
145 * original datagram. Since, for gateways, the remaining ttl is
146 * zero, the icmp "time exceeded" is guaranteed to not make it back
147 * to us. The behavior of this bug is slightly more interesting
148 * when it appears on the destination system:
149 *
150 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
151 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
152 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
153 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
154 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
155 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
156 * 7 * * *
157 * 8 * * *
158 * 9 * * *
159 * 10 * * *
160 * 11 * * *
161 * 12 * * *
162 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
163 *
164 * Notice that there are 12 "gateways" (13 is the final
165 * destination) and exactly the last half of them are "missing".
166 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
167 * is using the ttl from our arriving datagram as the ttl in its
168 * icmp reply. So, the reply will time out on the return path
169 * (with no notice sent to anyone since icmp's aren't sent for
170 * icmp's) until we probe with a ttl that's at least twice the path
171 * length. I.e., rip is really only 7 hops away. A reply that
172 * returns with a ttl of 1 is a clue this problem exists.
173 * Traceroute prints a "!" after the time if the ttl is <= 1.
174 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
175 * non-standard (HPUX) software, expect to see this problem
176 * frequently and/or take care picking the target host of your
177 * probes.
178 *
179 * Other possible annotations after the time are !H, !N, !P (got a host,
180 * network or protocol unreachable, respectively), !S or !F (source
181 * route failed or fragmentation needed -- neither of these should
182 * ever occur and the associated gateway is busted if you see one). If
183 * almost all the probes result in some kind of unreachable, traceroute
184 * will give up and exit.
185 *
186 * Notes
187 * -----
188 * This program must be run by root or be setuid. (I suggest that
189 * you *don't* make it setuid -- casual use could result in a lot
190 * of unnecessary traffic on our poor, congested nets.)
191 *
192 * This program requires a kernel mod that does not appear in any
193 * system available from Berkeley: A raw ip socket using proto
194 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
195 * opposed to data to be wrapped in an ip datagram). See the README
196 * file that came with the source to this program for a description
197 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
198 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
199 * MODIFIED TO RUN THIS PROGRAM.
200 *
201 * The udp port usage may appear bizarre (well, ok, it is bizarre).
202 * The problem is that an icmp message only contains 8 bytes of
203 * data from the original datagram. 8 bytes is the size of a udp
204 * header so, if we want to associate replies with the original
205 * datagram, the necessary information must be encoded into the
206 * udp header (the ip id could be used but there's no way to
207 * interlock with the kernel's assignment of ip id's and, anyway,
208 * it would have taken a lot more kernel hacking to allow this
209 * code to set the ip id). So, to allow two or more users to
210 * use traceroute simultaneously, we use this task's pid as the
211 * source port (the high bit is set to move the port number out
212 * of the "likely" range). To keep track of which probe is being
213 * replied to (so times and/or hop counts don't get confused by a
214 * reply that was delayed in transit), we increment the destination
215 * port number before each probe.
216 *
217 * Don't use this as a coding example. I was trying to find a
218 * routing problem and this code sort-of popped out after 48 hours
219 * without sleep. I was amazed it ever compiled, much less ran.
220 *
221 * I stole the idea for this program from Steve Deering. Since
222 * the first release, I've learned that had I attended the right
223 * IETF working group meetings, I also could have stolen it from Guy
224 * Almes or Matt Mathis. I don't know (or care) who came up with
225 * the idea first. I envy the originators' perspicacity and I'm
226 * glad they didn't keep the idea a secret.
227 *
228 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
229 * enhancements to the original distribution.
230 *
231 * I've hacked up a round-trip-route version of this that works by
232 * sending a loose-source-routed udp datagram through the destination
233 * back to yourself. Unfortunately, SO many gateways botch source
234 * routing, the thing is almost worthless. Maybe one day...
235 *
236 * -- Van Jacobson (van@helios.ee.lbl.gov)
237 * Tue Dec 20 03:50:13 PST 1988
238 */
239
240 #include <sys/param.h>
241 #include <sys/time.h>
242 #include <sys/socket.h>
243 #include <sys/uio.h>
244 #include <sys/file.h>
245 #include <sys/ioctl.h>
246 #include <sys/sysctl.h>
247
248 #include <netinet/in.h>
249
250 #include <arpa/inet.h>
251
252 #include <netdb.h>
253 #include <stdio.h>
254 #include <err.h>
255 #ifdef HAVE_POLL
256 #include <poll.h>
257 #endif
258 #include <errno.h>
259 #include <stdlib.h>
260 #include <string.h>
261 #include <unistd.h>
262
263 #include <netinet/ip6.h>
264 #include <netinet/icmp6.h>
265 #include <netinet/udp.h>
266
267 #define DUMMY_PORT 10010
268
269 #define MAXPACKET 65535 /* max ip packet size */
270
271 #ifndef HAVE_GETIPNODEBYNAME
272 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
273 #define freehostent(x)
274 #endif
275
276 /*
277 * format of a (udp) probe packet.
278 */
279 struct tv32 {
280 u_int32_t tv32_sec;
281 u_int32_t tv32_usec;
282 };
283
284 struct opacket {
285 u_char seq; /* sequence number of this packet */
286 u_char hops; /* hop limit of the packet */
287 u_char pad[2];
288 struct tv32 tv; /* time packet left */
289 } __attribute__((__packed__));
290
291 static u_char packet[512]; /* last inbound (icmp) packet */
292 static struct opacket *outpacket; /* last output (udp) packet */
293
294 static int wait_for_reply(int, struct msghdr *);
295 static void send_probe(int, u_long);
296 static void *get_uphdr(struct ip6_hdr *, u_char *);
297 static double deltaT(struct timeval *, struct timeval *);
298 static char *pr_type(int);
299 static int packet_ok(struct msghdr *, int, int);
300 static void print(struct msghdr *, int);
301 static const char *inetname(struct sockaddr *);
302 static void usage(void) __dead2;
303
304 static int rcvsock; /* receive (icmp) socket file descriptor */
305 static int sndsock; /* send (udp) socket file descriptor */
306
307 static struct msghdr rcvmhdr;
308 static struct iovec rcviov[2];
309 static int rcvhlim;
310 static struct in6_pktinfo *rcvpktinfo;
311
312 static struct sockaddr_in6 Src, Dst, Rcv;
313 static u_long datalen; /* How much data */
314 #define ICMP6ECHOLEN 8
315
316 static char *source = NULL;
317 static char *hostname;
318
319 static u_long nprobes = 3;
320 static u_long first_hop = 1;
321 static u_long max_hops = 30;
322 static u_int16_t srcport;
323 static u_int16_t port = 32768+666; /* start udp dest port # for probe packets */
324 static u_int16_t ident;
325 static int options; /* socket options */
326 static int verbose;
327 static int waittime = 5; /* time to wait for response (in seconds) */
328 static int nflag; /* print addresses numerically */
329 static int useproto = IPPROTO_UDP; /* protocol to use to send packet */
330 static int lflag; /* print both numerical address & hostname */
331
332 int
333 main(int argc, char **argv)
334 {
335 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM };
336 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep;
337 int ch, i, on = 1, seq, rcvcmsglen, error, minlen;
338 struct addrinfo hints, *res;
339 static u_char *rcvcmsgbuf;
340 u_long probe, hops, lport;
341 struct hostent *hp;
342 size_t size;
343 uid_t uid;
344
345 /*
346 * Receive ICMP
347 */
348 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
349 perror("socket(ICMPv6)");
350 exit(5);
351 }
352
353 size = sizeof(i);
354 (void) sysctl(mib, NELEM(mib), &i, &size, NULL, 0);
355 max_hops = i;
356
357 /* specify to tell receiving interface */
358 #ifdef IPV6_RECVPKTINFO
359 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
360 sizeof(on)) < 0)
361 err(1, "setsockopt(IPV6_RECVPKTINFO)");
362 #else /* old adv. API */
363 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
364 sizeof(on)) < 0)
365 err(1, "setsockopt(IPV6_PKTINFO)");
366 #endif
367
368 /* specify to tell value of hoplimit field of received IP6 hdr */
369 #ifdef IPV6_RECVHOPLIMIT
370 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
371 sizeof(on)) < 0)
372 err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
373 #else /* old adv. API */
374 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
375 sizeof(on)) < 0)
376 err(1, "setsockopt(IPV6_HOPLIMIT)");
377 #endif
378
379 seq = 0;
380
381 while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1)
382 switch (ch) {
383 case 'd':
384 options |= SO_DEBUG;
385 break;
386 case 'f':
387 ep = NULL;
388 errno = 0;
389 first_hop = strtoul(optarg, &ep, 0);
390 if (errno || !*optarg || *ep || first_hop > 255) {
391 fprintf(stderr,
392 "traceroute6: invalid min hoplimit.\n");
393 exit(1);
394 }
395 break;
396 case 'g':
397 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
398 if (hp == NULL) {
399 fprintf(stderr,
400 "traceroute6: unknown host %s\n", optarg);
401 exit(1);
402 }
403 freehostent(hp);
404 break;
405 case 'I':
406 useproto = IPPROTO_ICMPV6;
407 ident = htons(getpid() & 0xffff); /* same as ping6 */
408 break;
409 case 'l':
410 lflag++;
411 break;
412 case 'm':
413 ep = NULL;
414 errno = 0;
415 max_hops = strtoul(optarg, &ep, 0);
416 if (errno || !*optarg || *ep || max_hops > 255) {
417 fprintf(stderr,
418 "traceroute6: invalid max hoplimit.\n");
419 exit(1);
420 }
421 break;
422 case 'n':
423 nflag++;
424 break;
425 case 'N':
426 useproto = IPPROTO_NONE;
427 break;
428 case 'p':
429 ep = NULL;
430 errno = 0;
431 lport = strtoul(optarg, &ep, 0);
432 if (errno || !*optarg || *ep) {
433 fprintf(stderr, "traceroute6: invalid port.\n");
434 exit(1);
435 }
436 if (lport == 0 || lport != (lport & 0xffff)) {
437 fprintf(stderr,
438 "traceroute6: port out of range.\n");
439 exit(1);
440 }
441 port = lport & 0xffff;
442 break;
443 case 'q':
444 ep = NULL;
445 errno = 0;
446 nprobes = strtoul(optarg, &ep, 0);
447 if (errno || !*optarg || *ep) {
448 fprintf(stderr,
449 "traceroute6: invalid nprobes.\n");
450 exit(1);
451 }
452 if (nprobes < 1) {
453 fprintf(stderr,
454 "traceroute6: nprobes must be >0.\n");
455 exit(1);
456 }
457 break;
458 case 'r':
459 options |= SO_DONTROUTE;
460 break;
461 case 's':
462 /*
463 * set the ip source address of the outbound
464 * probe (e.g., on a multi-homed host).
465 */
466 source = optarg;
467 break;
468 case 'v':
469 verbose++;
470 break;
471 case 'U':
472 useproto = IPPROTO_UDP;
473 break;
474 case 'w':
475 ep = NULL;
476 errno = 0;
477 waittime = strtoul(optarg, &ep, 0);
478 if (errno || !*optarg || *ep) {
479 fprintf(stderr,
480 "traceroute6: invalid wait time.\n");
481 exit(1);
482 }
483 if (waittime < 1) {
484 fprintf(stderr,
485 "traceroute6: wait must be >= 1 sec.\n");
486 exit(1);
487 }
488 break;
489 default:
490 usage();
491 }
492 argc -= optind;
493 argv += optind;
494
495 /*
496 * Open socket to send probe packets.
497 */
498 switch (useproto) {
499 case IPPROTO_ICMPV6:
500 sndsock = rcvsock;
501 break;
502 case IPPROTO_UDP:
503 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
504 perror("socket(SOCK_DGRAM)");
505 exit(5);
506 }
507 break;
508 case IPPROTO_NONE:
509 if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) {
510 perror("socket(SOCK_RAW)");
511 exit(5);
512 }
513 break;
514 default:
515 fprintf(stderr, "traceroute6: unknown probe protocol %d",
516 useproto);
517 exit(5);
518 }
519 if (max_hops < first_hop) {
520 fprintf(stderr,
521 "traceroute6: max hoplimit must be larger than first hoplimit.\n");
522 exit(1);
523 }
524
525 /* revoke privs */
526 uid = getuid();
527 if (setresuid(uid, uid, uid) == -1) {
528 perror("setresuid");
529 exit(1);
530 }
531
532
533 if (argc < 1 || argc > 2)
534 usage();
535
536 #if 1
537 setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
538 #else
539 setlinebuf(stdout);
540 #endif
541
542 memset(&hints, 0, sizeof(hints));
543 hints.ai_family = PF_INET6;
544 hints.ai_socktype = SOCK_RAW;
545 hints.ai_protocol = IPPROTO_ICMPV6;
546 hints.ai_flags = AI_CANONNAME;
547 error = getaddrinfo(*argv, NULL, &hints, &res);
548 if (error) {
549 fprintf(stderr,
550 "traceroute6: %s\n", gai_strerror(error));
551 exit(1);
552 }
553 if (res->ai_addrlen != sizeof(Dst)) {
554 fprintf(stderr,
555 "traceroute6: size of sockaddr mismatch\n");
556 exit(1);
557 }
558 memcpy(&Dst, res->ai_addr, res->ai_addrlen);
559 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
560 if (!hostname) {
561 fprintf(stderr, "traceroute6: not enough core\n");
562 exit(1);
563 }
564 if (res->ai_next) {
565 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf,
566 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
567 strlcpy(hbuf, "?", sizeof(hbuf));
568 fprintf(stderr, "traceroute6: Warning: %s has multiple "
569 "addresses; using %s\n", hostname, hbuf);
570 }
571
572 if (*++argv) {
573 ep = NULL;
574 errno = 0;
575 datalen = strtoul(*argv, &ep, 0);
576 if (errno || !*argv || *ep) {
577 fprintf(stderr,
578 "traceroute6: invalid packet length.\n");
579 exit(1);
580 }
581 }
582 switch (useproto) {
583 case IPPROTO_ICMPV6:
584 minlen = ICMP6ECHOLEN + sizeof(struct tv32);
585 break;
586 case IPPROTO_UDP:
587 minlen = sizeof(struct opacket);
588 break;
589 case IPPROTO_NONE:
590 minlen = 0;
591 datalen = 0;
592 break;
593 default:
594 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n",
595 useproto);
596 exit(1);
597 }
598 if (datalen < minlen)
599 datalen = minlen;
600 else if (datalen >= MAXPACKET) {
601 fprintf(stderr,
602 "traceroute6: packet size must be %d <= s < %ld.\n",
603 minlen, (long)MAXPACKET);
604 exit(1);
605 }
606 outpacket = (struct opacket *)malloc((unsigned)datalen);
607 if (!outpacket) {
608 perror("malloc");
609 exit(1);
610 }
611 (void) bzero((char *)outpacket, datalen);
612
613 /* initialize msghdr for receiving packets */
614 rcviov[0].iov_base = (caddr_t)packet;
615 rcviov[0].iov_len = sizeof(packet);
616 rcvmhdr.msg_name = (caddr_t)&Rcv;
617 rcvmhdr.msg_namelen = sizeof(Rcv);
618 rcvmhdr.msg_iov = rcviov;
619 rcvmhdr.msg_iovlen = 1;
620 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
621 CMSG_SPACE(sizeof(int));
622 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
623 fprintf(stderr, "traceroute6: malloc failed\n");
624 exit(1);
625 }
626 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
627 rcvmhdr.msg_controllen = rcvcmsglen;
628
629 if (options & SO_DEBUG)
630 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
631 (char *)&on, sizeof(on));
632 if (options & SO_DONTROUTE)
633 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
634 (char *)&on, sizeof(on));
635 #ifdef SO_SNDBUF
636 i = datalen;
637 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i,
638 sizeof(i)) < 0 && useproto != IPPROTO_NONE) {
639 perror("setsockopt(SO_SNDBUF)");
640 exit(6);
641 }
642 #endif /* SO_SNDBUF */
643 if (options & SO_DEBUG)
644 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
645 (char *)&on, sizeof(on));
646 if (options & SO_DONTROUTE)
647 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
648 (char *)&on, sizeof(on));
649 /*
650 * Source selection
651 */
652 bzero(&Src, sizeof(Src));
653 if (source) {
654 struct addrinfo hints, *res;
655 int error;
656
657 memset(&hints, 0, sizeof(hints));
658 hints.ai_family = AF_INET6;
659 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
660 hints.ai_flags = AI_NUMERICHOST;
661 error = getaddrinfo(source, "0", &hints, &res);
662 if (error) {
663 printf("traceroute6: %s: %s\n", source,
664 gai_strerror(error));
665 exit(1);
666 }
667 if (res->ai_addrlen > sizeof(Src)) {
668 printf("traceroute6: %s: %s\n", source,
669 gai_strerror(error));
670 exit(1);
671 }
672 memcpy(&Src, res->ai_addr, res->ai_addrlen);
673 freeaddrinfo(res);
674 } else {
675 struct sockaddr_in6 Nxt;
676 int dummy;
677 socklen_t len;
678
679 Nxt = Dst;
680 Nxt.sin6_port = htons(DUMMY_PORT);
681 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
682 perror("socket");
683 exit(1);
684 }
685 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
686 perror("connect");
687 exit(1);
688 }
689 len = sizeof(Src);
690 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
691 perror("getsockname");
692 exit(1);
693 }
694 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
695 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) {
696 fprintf(stderr, "getnameinfo failed for source\n");
697 exit(1);
698 }
699 source = src0;
700 close(dummy);
701 }
702
703 Src.sin6_port = htons(0);
704 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
705 perror("bind");
706 exit(1);
707 }
708
709 {
710 socklen_t len;
711
712 len = sizeof(Src);
713 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) {
714 perror("getsockname");
715 exit(1);
716 }
717 srcport = ntohs(Src.sin6_port);
718 }
719
720 /*
721 * Message to users
722 */
723 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
724 sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
725 strlcpy(hbuf, "(invalid)", sizeof(hbuf));
726 fprintf(stderr, "traceroute6");
727 fprintf(stderr, " to %s (%s)", hostname, hbuf);
728 if (source)
729 fprintf(stderr, " from %s", source);
730 fprintf(stderr, ", %lu hops max, %lu byte packets\n",
731 max_hops, datalen);
732 (void) fflush(stderr);
733
734 if (first_hop > 1)
735 printf("Skipping %lu intermediate hops\n", first_hop - 1);
736
737 /*
738 * Main loop
739 */
740 for (hops = first_hop; hops <= max_hops; ++hops) {
741 struct in6_addr lastaddr;
742 int got_there = 0;
743 int unreachable = 0;
744
745 printf("%2lu ", hops);
746 bzero(&lastaddr, sizeof(lastaddr));
747 for (probe = 0; probe < nprobes; ++probe) {
748 int cc;
749 struct timeval t1, t2;
750
751 (void) gettimeofday(&t1, NULL);
752 send_probe(++seq, hops);
753 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
754 (void) gettimeofday(&t2, NULL);
755 if ((i = packet_ok(&rcvmhdr, cc, seq))) {
756 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
757 &lastaddr)) {
758 if (probe > 0)
759 fputs("\n ", stdout);
760 print(&rcvmhdr, cc);
761 lastaddr = Rcv.sin6_addr;
762 }
763 printf(" %.3f ms", deltaT(&t1, &t2));
764 switch (i - 1) {
765 case ICMP6_DST_UNREACH_NOROUTE:
766 ++unreachable;
767 printf(" !N");
768 break;
769 case ICMP6_DST_UNREACH_ADMIN:
770 ++unreachable;
771 printf(" !P");
772 break;
773 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
774 ++unreachable;
775 printf(" !S");
776 break;
777 case ICMP6_DST_UNREACH_ADDR:
778 ++unreachable;
779 printf(" !A");
780 break;
781 case ICMP6_DST_UNREACH_NOPORT:
782 if (rcvhlim >= 0 &&
783 rcvhlim <= 1)
784 printf(" !");
785 ++got_there;
786 break;
787 }
788 break;
789 }
790 }
791 if (cc == 0)
792 printf(" *");
793 (void) fflush(stdout);
794 }
795 putchar('\n');
796 if (got_there ||
797 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
798 exit(0);
799 }
800 }
801
802 exit(0);
803 }
804
805 static int
806 wait_for_reply(int sock, struct msghdr *mhdr)
807 {
808 #ifdef HAVE_POLL
809 struct pollfd pfd[1];
810 int cc = 0;
811
812 pfd[0].fd = sock;
813 pfd[0].events = POLLIN;
814 pfd[0].revents = 0;
815
816 if (poll(pfd, 1, waittime * 1000) > 0)
817 cc = recvmsg(rcvsock, mhdr, 0);
818
819 return(cc);
820 #else
821 fd_set *fdsp;
822 struct timeval wait;
823 int cc = 0, fdsn;
824
825 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
826 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
827 err(1, "malloc");
828 memset(fdsp, 0, fdsn);
829 FD_SET(sock, fdsp);
830 wait.tv_sec = waittime; wait.tv_usec = 0;
831
832 if (select(sock+1, fdsp, NULL, NULL, &wait) > 0)
833 cc = recvmsg(rcvsock, mhdr, 0);
834
835 free(fdsp);
836 return(cc);
837 #endif
838 }
839
840 static void
841 send_probe(int seq, u_long hops)
842 {
843 struct icmp6_hdr *icp;
844 struct opacket *op;
845 struct timeval tv;
846 struct tv32 tv32;
847 int i;
848
849 i = hops;
850 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
851 (char *)&i, sizeof(i)) < 0) {
852 perror("setsockopt IPV6_UNICAST_HOPS");
853 }
854
855 Dst.sin6_port = htons(port + seq);
856 (void) gettimeofday(&tv, NULL);
857 tv32.tv32_sec = htonl(tv.tv_sec);
858 tv32.tv32_usec = htonl(tv.tv_usec);
859
860 switch (useproto) {
861 case IPPROTO_ICMPV6:
862 icp = (struct icmp6_hdr *)outpacket;
863
864 icp->icmp6_type = ICMP6_ECHO_REQUEST;
865 icp->icmp6_code = 0;
866 icp->icmp6_cksum = 0;
867 icp->icmp6_id = ident;
868 icp->icmp6_seq = htons(seq);
869 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN),
870 sizeof(tv32));
871 break;
872 case IPPROTO_UDP:
873 op = outpacket;
874
875 op->seq = seq;
876 op->hops = hops;
877 bcopy(&tv32, &op->tv, sizeof tv32);
878 break;
879 case IPPROTO_NONE:
880 /* No space for anything. No harm as seq/tv32 are decorative. */
881 break;
882 default:
883 fprintf(stderr, "Unknown probe protocol %d.\n", useproto);
884 exit(1);
885 }
886
887 i = sendto(sndsock, (char *)outpacket, datalen, 0,
888 (struct sockaddr *)&Dst, Dst.sin6_len);
889 if (i < 0 || i != datalen) {
890 if (i < 0)
891 perror("sendto");
892 printf("traceroute6: wrote %s %lu chars, ret=%d\n",
893 hostname, datalen, i);
894 (void) fflush(stdout);
895 }
896 }
897
898 static double
899 deltaT(struct timeval *t1p, struct timeval *t2p)
900 {
901 double dt;
902
903 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
904 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
905 return (dt);
906 }
907
908 /*
909 * Convert an ICMP "type" field to a printable string.
910 */
911 static char *
912 pr_type(int t0)
913 {
914 u_char t = t0 & 0xff;
915 char *cp;
916
917 switch (t) {
918 case ICMP6_DST_UNREACH:
919 cp = "Destination Unreachable";
920 break;
921 case ICMP6_PACKET_TOO_BIG:
922 cp = "Packet Too Big";
923 break;
924 case ICMP6_TIME_EXCEEDED:
925 cp = "Time Exceeded";
926 break;
927 case ICMP6_PARAM_PROB:
928 cp = "Parameter Problem";
929 break;
930 case ICMP6_ECHO_REQUEST:
931 cp = "Echo Request";
932 break;
933 case ICMP6_ECHO_REPLY:
934 cp = "Echo Reply";
935 break;
936 case ICMP6_MEMBERSHIP_QUERY:
937 cp = "Group Membership Query";
938 break;
939 case ICMP6_MEMBERSHIP_REPORT:
940 cp = "Group Membership Report";
941 break;
942 case ICMP6_MEMBERSHIP_REDUCTION:
943 cp = "Group Membership Reduction";
944 break;
945 case ND_ROUTER_SOLICIT:
946 cp = "Router Solicitation";
947 break;
948 case ND_ROUTER_ADVERT:
949 cp = "Router Advertisement";
950 break;
951 case ND_NEIGHBOR_SOLICIT:
952 cp = "Neighbor Solicitation";
953 break;
954 case ND_NEIGHBOR_ADVERT:
955 cp = "Neighbor Advertisement";
956 break;
957 case ND_REDIRECT:
958 cp = "Redirect";
959 break;
960 default:
961 cp = "Unknown";
962 break;
963 }
964 return cp;
965 }
966
967 static int
968 packet_ok(struct msghdr *mhdr, int cc, int seq)
969 {
970 struct icmp6_hdr *icp;
971 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
972 u_char type, code;
973 char *buf = (char *)mhdr->msg_iov[0].iov_base;
974 struct cmsghdr *cm;
975 int *hlimp;
976 char hbuf[NI_MAXHOST];
977
978 #ifdef OLDRAWSOCKET
979 int hlen;
980 struct ip6_hdr *ip;
981 #endif
982
983 #ifdef OLDRAWSOCKET
984 ip = (struct ip6_hdr *) buf;
985 hlen = sizeof(struct ip6_hdr);
986 if (cc < hlen + sizeof(struct icmp6_hdr)) {
987 if (verbose) {
988 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
989 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
990 strlcpy(hbuf, "invalid", sizeof(hbuf));
991 printf("packet too short (%d bytes) from %s\n", cc,
992 hbuf);
993 }
994 return (0);
995 }
996 cc -= hlen;
997 icp = (struct icmp6_hdr *)(buf + hlen);
998 #else
999 if (cc < sizeof(struct icmp6_hdr)) {
1000 if (verbose) {
1001 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1002 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1003 strlcpy(hbuf, "invalid", sizeof(hbuf));
1004 printf("data too short (%d bytes) from %s\n", cc, hbuf);
1005 }
1006 return(0);
1007 }
1008 icp = (struct icmp6_hdr *)buf;
1009 #endif
1010 /* get optional information via advanced API */
1011 rcvpktinfo = NULL;
1012 hlimp = NULL;
1013 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1014 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1015 if (cm->cmsg_level == IPPROTO_IPV6 &&
1016 cm->cmsg_type == IPV6_PKTINFO &&
1017 cm->cmsg_len ==
1018 CMSG_LEN(sizeof(struct in6_pktinfo)))
1019 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
1020
1021 if (cm->cmsg_level == IPPROTO_IPV6 &&
1022 cm->cmsg_type == IPV6_HOPLIMIT &&
1023 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1024 hlimp = (int *)CMSG_DATA(cm);
1025 }
1026 if (rcvpktinfo == NULL || hlimp == NULL) {
1027 warnx("failed to get received hop limit or packet info");
1028 #if 0
1029 return(0);
1030 #else
1031 rcvhlim = 0; /*XXX*/
1032 #endif
1033 }
1034 else
1035 rcvhlim = *hlimp;
1036
1037 type = icp->icmp6_type;
1038 code = icp->icmp6_code;
1039 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
1040 || type == ICMP6_DST_UNREACH) {
1041 struct ip6_hdr *hip;
1042 void *up;
1043
1044 hip = (struct ip6_hdr *)(icp + 1);
1045 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) {
1046 if (verbose)
1047 warnx("failed to get upper layer header");
1048 return(0);
1049 }
1050 switch (useproto) {
1051 case IPPROTO_ICMPV6:
1052 if (((struct icmp6_hdr *)up)->icmp6_id == ident &&
1053 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq))
1054 return (type == ICMP6_TIME_EXCEEDED ?
1055 -1 : code + 1);
1056 break;
1057 case IPPROTO_UDP:
1058 if (((struct udphdr *)up)->uh_sport == htons(srcport) &&
1059 ((struct udphdr *)up)->uh_dport == htons(port + seq))
1060 return (type == ICMP6_TIME_EXCEEDED ?
1061 -1 : code + 1);
1062 break;
1063 case IPPROTO_NONE:
1064 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
1065 default:
1066 fprintf(stderr, "Unknown probe proto %d.\n", useproto);
1067 break;
1068 }
1069 } else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) {
1070 if (icp->icmp6_id == ident &&
1071 icp->icmp6_seq == htons(seq))
1072 return (ICMP6_DST_UNREACH_NOPORT + 1);
1073 }
1074 if (verbose) {
1075 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
1076 u_int8_t *p;
1077 int i;
1078
1079 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1080 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0)
1081 strlcpy(sbuf, "invalid", sizeof(sbuf));
1082 printf("\n%d bytes from %s to %s", cc, sbuf,
1083 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1084 dbuf, sizeof(dbuf)) : "?");
1085 printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
1086 icp->icmp6_code);
1087 p = (u_int8_t *)(icp + 1);
1088 #define WIDTH 16
1089 for (i = 0; i < cc; i++) {
1090 if (i % WIDTH == 0)
1091 printf("%04x:", i);
1092 if (i % 4 == 0)
1093 printf(" ");
1094 printf("%02x", p[i]);
1095 if (i % WIDTH == WIDTH - 1)
1096 printf("\n");
1097 }
1098 if (cc % WIDTH != 0)
1099 printf("\n");
1100 }
1101 return(0);
1102 }
1103
1104 /*
1105 * Increment pointer until find the UDP or ICMP header.
1106 */
1107 static void *
1108 get_uphdr(struct ip6_hdr *ip6, u_char *lim)
1109 {
1110 u_char *cp = (u_char *)ip6, nh;
1111 int hlen;
1112 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */
1113
1114 if (cp + sizeof(*ip6) > lim)
1115 return(NULL);
1116
1117 nh = ip6->ip6_nxt;
1118 cp += sizeof(struct ip6_hdr);
1119
1120 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) {
1121 switch (nh) {
1122 case IPPROTO_ESP:
1123 case IPPROTO_TCP:
1124 return(NULL);
1125 case IPPROTO_ICMPV6:
1126 return(useproto == nh ? cp : NULL);
1127 case IPPROTO_UDP:
1128 return(useproto == nh ? cp : NULL);
1129 case IPPROTO_NONE:
1130 return(useproto == nh ? none_hdr : NULL);
1131 case IPPROTO_FRAGMENT:
1132 hlen = sizeof(struct ip6_frag);
1133 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
1134 break;
1135 case IPPROTO_AH:
1136 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
1137 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1138 break;
1139 default:
1140 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
1141 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1142 break;
1143 }
1144
1145 cp += hlen;
1146 }
1147
1148 return(NULL);
1149 }
1150
1151 static void
1152 print(struct msghdr *mhdr, int cc)
1153 {
1154 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1155 char hbuf[NI_MAXHOST];
1156
1157 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1158 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
1159 strlcpy(hbuf, "invalid", sizeof(hbuf));
1160 if (nflag)
1161 printf(" %s", hbuf);
1162 else if (lflag)
1163 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
1164 else
1165 printf(" %s", inetname((struct sockaddr *)from));
1166
1167 if (verbose) {
1168 #ifdef OLDRAWSOCKET
1169 printf(" %d bytes to %s", cc,
1170 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1171 hbuf, sizeof(hbuf)) : "?");
1172 #else
1173 printf(" %d bytes of data to %s", cc,
1174 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1175 hbuf, sizeof(hbuf)) : "?");
1176 #endif
1177 }
1178 }
1179
1180 /*
1181 * Construct an Internet address representation.
1182 * If the nflag has been supplied, give
1183 * numeric value, otherwise try for symbolic name.
1184 */
1185 static const char *
1186 inetname(struct sockaddr *sa)
1187 {
1188 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1];
1189 static int first = 1;
1190 char *cp;
1191
1192 if (first && !nflag) {
1193 first = 0;
1194 if (gethostname(domain, sizeof(domain)) == 0 &&
1195 (cp = strchr(domain, '.')))
1196 (void) strlcpy(domain, cp + 1, sizeof(domain));
1197 else
1198 domain[0] = 0;
1199 }
1200 cp = NULL;
1201 if (!nflag) {
1202 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1203 NI_NAMEREQD) == 0) {
1204 if ((cp = strchr(line, '.')) &&
1205 !strcmp(cp + 1, domain))
1206 *cp = 0;
1207 cp = line;
1208 }
1209 }
1210 if (cp)
1211 return cp;
1212
1213 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1214 NI_NUMERICHOST) != 0)
1215 strlcpy(line, "invalid", sizeof(line));
1216 return line;
1217 }
1218
1219 static void
1220 usage(void)
1221 {
1222
1223 fprintf(stderr,
1224 "usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n"
1225 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n");
1226 exit(1);
1227 }
DragonFly BSD