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Remove tm.h and xm.h handling, as it wasn't used. Use nm.h only when needed.
[dragonfly.git] / usr.sbin / traceroute6 / traceroute6.c
blob017df90f5c83ac714aa6f3cc3475543942ef1f32
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 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved.
32 * @(#)traceroute.c 8.1 (Berkeley) 6/6/93
33 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.4.2.4 2001/07/03 11:02:18 ume Exp $
34 * $DragonFly: src/usr.sbin/traceroute6/traceroute6.c,v 1.7 2007/10/25 08:12:42 hasso Exp $
35 */
36
37 /*-
38 * Copyright (c) 1990, 1993
39 * The Regents of the University of California. All rights reserved.
40 *
41 * This code is derived from software contributed to Berkeley by
42 * Van Jacobson.
43 *
44 * Redistribution and use in source and binary forms, with or without
45 * modification, are permitted provided that the following conditions
46 * are met:
47 * 1. Redistributions of source code must retain the above copyright
48 * notice, this list of conditions and the following disclaimer.
49 * 2. Redistributions in binary form must reproduce the above copyright
50 * notice, this list of conditions and the following disclaimer in the
51 * documentation and/or other materials provided with the distribution.
52 * 3. All advertising materials mentioning features or use of this software
53 * must display the following acknowledgement:
54 * This product includes software developed by the University of
55 * California, Berkeley and its contributors.
56 * 4. Neither the name of the University nor the names of its contributors
57 * may be used to endorse or promote products derived from this software
58 * without specific prior written permission.
59 *
60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
70 * SUCH DAMAGE.
71 */
72
73 /*
74 * traceroute host - trace the route ip packets follow going to "host".
75 *
76 * Attempt to trace the route an ip packet would follow to some
77 * internet host. We find out intermediate hops by launching probe
78 * packets with a small ttl (time to live) then listening for an
79 * icmp "time exceeded" reply from a gateway. We start our probes
80 * with a ttl of one and increase by one until we get an icmp "port
81 * unreachable" (which means we got to "host") or hit a max (which
82 * defaults to 30 hops & can be changed with the -m flag). Three
83 * probes (change with -q flag) are sent at each ttl setting and a
84 * line is printed showing the ttl, address of the gateway and
85 * round trip time of each probe. If the probe answers come from
86 * different gateways, the address of each responding system will
87 * be printed. If there is no response within a 5 sec. timeout
88 * interval (changed with the -w flag), a "*" is printed for that
89 * probe.
90 *
91 * Probe packets are UDP format. We don't want the destination
92 * host to process them so the destination port is set to an
93 * unlikely value (if some clod on the destination is using that
94 * value, it can be changed with the -p flag).
95 *
96 * A sample use might be:
97 *
98 * [yak 71]% traceroute nis.nsf.net.
99 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
100 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
101 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
102 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
103 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
104 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
105 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
106 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
107 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
108 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
109 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
110 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
111 *
112 * Note that lines 2 & 3 are the same. This is due to a buggy
113 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
114 * packets with a zero ttl.
115 *
116 * A more interesting example is:
117 *
118 * [yak 72]% traceroute allspice.lcs.mit.edu.
119 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
120 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
121 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
122 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
123 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
124 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
125 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
126 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
127 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
128 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
129 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
130 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
131 * 12 * * *
132 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
133 * 14 * * *
134 * 15 * * *
135 * 16 * * *
136 * 17 * * *
137 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
138 *
139 * (I start to see why I'm having so much trouble with mail to
140 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
141 * either don't send ICMP "time exceeded" messages or send them
142 * with a ttl too small to reach us. 14 - 17 are running the
143 * MIT C Gateway code that doesn't send "time exceeded"s. God
144 * only knows what's going on with 12.
145 *
146 * The silent gateway 12 in the above may be the result of a bug in
147 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
148 * sends an unreachable message using whatever ttl remains in the
149 * original datagram. Since, for gateways, the remaining ttl is
150 * zero, the icmp "time exceeded" is guaranteed to not make it back
151 * to us. The behavior of this bug is slightly more interesting
152 * when it appears on the destination system:
153 *
154 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
155 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
156 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
157 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
158 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
159 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
160 * 7 * * *
161 * 8 * * *
162 * 9 * * *
163 * 10 * * *
164 * 11 * * *
165 * 12 * * *
166 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
167 *
168 * Notice that there are 12 "gateways" (13 is the final
169 * destination) and exactly the last half of them are "missing".
170 * What's really happening is that rip (a Sun-3 running Sun OS3.5)
171 * is using the ttl from our arriving datagram as the ttl in its
172 * icmp reply. So, the reply will time out on the return path
173 * (with no notice sent to anyone since icmp's aren't sent for
174 * icmp's) until we probe with a ttl that's at least twice the path
175 * length. I.e., rip is really only 7 hops away. A reply that
176 * returns with a ttl of 1 is a clue this problem exists.
177 * Traceroute prints a "!" after the time if the ttl is <= 1.
178 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
179 * non-standard (HPUX) software, expect to see this problem
180 * frequently and/or take care picking the target host of your
181 * probes.
182 *
183 * Other possible annotations after the time are !H, !N, !P (got a host,
184 * network or protocol unreachable, respectively), !S or !F (source
185 * route failed or fragmentation needed -- neither of these should
186 * ever occur and the associated gateway is busted if you see one). If
187 * almost all the probes result in some kind of unreachable, traceroute
188 * will give up and exit.
189 *
190 * Notes
191 * -----
192 * This program must be run by root or be setuid. (I suggest that
193 * you *don't* make it setuid -- casual use could result in a lot
194 * of unnecessary traffic on our poor, congested nets.)
195 *
196 * This program requires a kernel mod that does not appear in any
197 * system available from Berkeley: A raw ip socket using proto
198 * IPPROTO_RAW must interpret the data sent as an ip datagram (as
199 * opposed to data to be wrapped in a ip datagram). See the README
200 * file that came with the source to this program for a description
201 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
202 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
203 * MODIFIED TO RUN THIS PROGRAM.
204 *
205 * The udp port usage may appear bizarre (well, ok, it is bizarre).
206 * The problem is that an icmp message only contains 8 bytes of
207 * data from the original datagram. 8 bytes is the size of a udp
208 * header so, if we want to associate replies with the original
209 * datagram, the necessary information must be encoded into the
210 * udp header (the ip id could be used but there's no way to
211 * interlock with the kernel's assignment of ip id's and, anyway,
212 * it would have taken a lot more kernel hacking to allow this
213 * code to set the ip id). So, to allow two or more users to
214 * use traceroute simultaneously, we use this task's pid as the
215 * source port (the high bit is set to move the port number out
216 * of the "likely" range). To keep track of which probe is being
217 * replied to (so times and/or hop counts don't get confused by a
218 * reply that was delayed in transit), we increment the destination
219 * port number before each probe.
220 *
221 * Don't use this as a coding example. I was trying to find a
222 * routing problem and this code sort-of popped out after 48 hours
223 * without sleep. I was amazed it ever compiled, much less ran.
224 *
225 * I stole the idea for this program from Steve Deering. Since
226 * the first release, I've learned that had I attended the right
227 * IETF working group meetings, I also could have stolen it from Guy
228 * Almes or Matt Mathis. I don't know (or care) who came up with
229 * the idea first. I envy the originators' perspicacity and I'm
230 * glad they didn't keep the idea a secret.
231 *
232 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
233 * enhancements to the original distribution.
234 *
235 * I've hacked up a round-trip-route version of this that works by
236 * sending a loose-source-routed udp datagram through the destination
237 * back to yourself. Unfortunately, SO many gateways botch source
238 * routing, the thing is almost worthless. Maybe one day...
239 *
240 * -- Van Jacobson (van@helios.ee.lbl.gov)
241 * Tue Dec 20 03:50:13 PST 1988
242 */
243
244 #include <sys/param.h>
245 #include <sys/time.h>
246 #include <sys/socket.h>
247 #include <sys/uio.h>
248 #include <sys/file.h>
249 #include <sys/ioctl.h>
250
251 #include <netinet/in.h>
252
253 #include <arpa/inet.h>
254
255 #include <netdb.h>
256 #include <stdio.h>
257 #include <err.h>
258 #ifdef HAVE_POLL
259 #include <poll.h>
260 #endif
261 #include <errno.h>
262 #include <stdlib.h>
263 #include <string.h>
264 #include <unistd.h>
265
266 #include <netinet/ip6.h>
267 #include <netinet/icmp6.h>
268 #include <netinet/udp.h>
269
270 #ifdef IPSEC
271 #include <net/route.h>
272 #include <netinet6/ipsec.h>
273 #endif
274
275 #define DUMMY_PORT 10010
276
277 #define MAXPACKET 65535 /* max ip packet size */
278 #ifndef MAXHOSTNAMELEN
279 #define MAXHOSTNAMELEN 64
280 #endif
281
282 #ifndef FD_SET
283 #define NFDBITS (8*sizeof(fd_set))
284 #define FD_SETSIZE NFDBITS
285 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
286 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
287 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
288 #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
289 #endif
290
291 #define Fprintf fprintf
292 #define Sprintf sprintf
293 #define Printf printf
294
295 #ifndef HAVE_GETIPNODEBYNAME
296 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
297 #define freehostent(x)
298 #endif
299
300 /*
301 * format of a (udp) probe packet.
302 */
303 struct opacket {
304 u_char seq; /* sequence number of this packet */
305 u_char hops; /* hop limit of the packet */
306 struct timeval tv; /* time packet left */
307 };
308
309 u_char packet[512]; /* last inbound (icmp) packet */
310 struct opacket *outpacket; /* last output (udp) packet */
311
312 int main(int, char **);
313 int wait_for_reply(int, struct msghdr *);
314 #ifdef IPSEC
315 #ifdef IPSEC_POLICY_IPSEC
316 int setpolicy(int so, char *policy);
317 #endif
318 #endif
319 void send_probe(int, int);
320 struct udphdr *get_udphdr(struct ip6_hdr *, u_char *);
321 int get_hoplim(struct msghdr *);
322 double deltaT(struct timeval *, struct timeval *);
323 char *pr_type(int);
324 int packet_ok(struct msghdr *, int, int);
325 void print(struct msghdr *, int);
326 void tvsub(struct timeval *, struct timeval *);
327 const char *inetname(struct sockaddr *);
328 void usage(void);
329
330 int rcvsock; /* receive (icmp) socket file descriptor */
331 int sndsock; /* send (udp) socket file descriptor */
332 struct timezone tz; /* leftover */
333
334 struct msghdr rcvmhdr;
335 struct iovec rcviov[2];
336 int rcvhlim;
337 struct in6_pktinfo *rcvpktinfo;
338
339 struct sockaddr_in6 Src, Dst, Rcv;
340 int datalen; /* How much data */
341 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
342 char rtbuf[2064];
343 #ifdef USE_RFC2292BIS
344 struct ip6_rthdr *rth;
345 #endif
346 struct cmsghdr *cmsg;
347
348 char *source = 0;
349 char *hostname;
350
351 int nprobes = 3;
352 int first_hop = 1;
353 int max_hops = 30;
354 u_short ident;
355 u_short port = 32768+666; /* start udp dest port # for probe packets */
356 int options; /* socket options */
357 int verbose;
358 int waittime = 5; /* time to wait for response (in seconds) */
359 int nflag; /* print addresses numerically */
360 int lflag; /* print both numerical address & hostname */
361
362 #ifdef KAME_SCOPEID
363 const int niflag = NI_WITHSCOPEID;
364 #else
365 const int niflag = 0;
366 #endif
367
368 int
369 main(int argc, char **argv)
370 {
371 struct hostent *hp;
372 int error;
373 struct addrinfo hints, *res;
374 int ch, i, on, probe, seq, hops, rcvcmsglen;
375 static u_char *rcvcmsgbuf;
376 char hbuf[NI_MAXHOST], src0[NI_MAXHOST];
377 char *ep;
378
379 /*
380 * Receive ICMP
381 */
382 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
383 perror("socket(ICMPv6)");
384 exit(5);
385 }
386
387 /* revoke privs */
388 seteuid(getuid());
389 setuid(getuid());
390
391 /* set a minimum set of socket options */
392 on = 1;
393 /* specify to tell receiving interface */
394 #ifdef IPV6_RECVPKTINFO
395 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
396 sizeof(on)) < 0)
397 err(1, "setsockopt(IPV6_RECVPKTINFO)");
398 #else /* old adv. API */
399 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
400 sizeof(on)) < 0)
401 err(1, "setsockopt(IPV6_PKTINFO)");
402 #endif
403
404 /* specify to tell value of hoplimit field of received IP6 hdr */
405 #ifdef IPV6_RECVHOPLIMIT
406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
407 sizeof(on)) < 0)
408 err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
409 #else /* old adv. API */
410 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
411 sizeof(on)) < 0)
412 err(1, "setsockopt(IPV6_HOPLIMIT)");
413 #endif
414
415 seq = 0;
416
417 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1)
418 switch(ch) {
419 case 'd':
420 options |= SO_DEBUG;
421 break;
422 case 'f':
423 ep = NULL;
424 first_hop = strtoul(optarg, &ep, 0);
425 if (!*argv || *ep) {
426 Fprintf(stderr,
427 "traceroute6: invalid min hoplimit.\n");
428 exit(1);
429 }
430 if (first_hop > max_hops) {
431 Fprintf(stderr,
432 "traceroute6: min hoplimit must be <= %d.\n", max_hops);
433 exit(1);
434 }
435 break;
436 case 'g':
437 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
438 if (hp == NULL) {
439 Fprintf(stderr,
440 "traceroute6: unknown host %s\n", optarg);
441 exit(1);
442 }
443 #ifdef USE_RFC2292BIS
444 if (rth == NULL) {
445 /*
446 * XXX: We can't detect the number of
447 * intermediate nodes yet.
448 */
449 if ((rth = inet6_rth_init((void *)rtbuf,
450 sizeof(rtbuf),
451 IPV6_RTHDR_TYPE_0,
452 0)) == NULL) {
453 Fprintf(stderr,
454 "inet6_rth_init failed.\n");
455 exit(1);
456 }
457 }
458 if (inet6_rth_add((void *)rth,
459 (struct in6_addr *)hp->h_addr)) {
460 Fprintf(stderr,
461 "inet6_rth_add failed for %s\n",
462 optarg);
463 exit(1);
464 }
465 #else /* old advanced API */
466 if (cmsg == NULL)
467 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
468 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE);
469 #endif
470 freehostent(hp);
471 break;
472 case 'l':
473 lflag++;
474 break;
475 case 'm':
476 ep = NULL;
477 max_hops = strtoul(optarg, &ep, 0);
478 if (!*argv || *ep) {
479 Fprintf(stderr,
480 "traceroute6: invalid max hoplimit.\n");
481 exit(1);
482 }
483 if (max_hops < first_hop) {
484 Fprintf(stderr,
485 "traceroute6: max hoplimit must be >= %d.\n", first_hop);
486 exit(1);
487 }
488 break;
489 case 'n':
490 nflag++;
491 break;
492 case 'p':
493 ep = NULL;
494 port = strtoul(optarg, &ep, 0);
495 if (!*argv || *ep) {
496 Fprintf(stderr,
497 "traceroute6: port.\n");
498 exit(1);
499 }
500 if (port < 1) {
501 Fprintf(stderr,
502 "traceroute6: port must be >0.\n");
503 exit(1);
504 }
505 break;
506 case 'q':
507 ep = NULL;
508 nprobes = strtoul(optarg, &ep, 0);
509 if (!*argv || *ep) {
510 Fprintf(stderr,
511 "traceroute6: invalid nprobes.\n");
512 exit(1);
513 }
514 if (nprobes < 1) {
515 Fprintf(stderr,
516 "traceroute6: nprobes must be >0.\n");
517 exit(1);
518 }
519 break;
520 case 'r':
521 options |= SO_DONTROUTE;
522 break;
523 case 's':
524 /*
525 * set the ip source address of the outbound
526 * probe (e.g., on a multi-homed host).
527 */
528 source = optarg;
529 break;
530 case 'v':
531 verbose++;
532 break;
533 case 'w':
534 ep = NULL;
535 waittime = strtoul(optarg, &ep, 0);
536 if (!*argv || *ep) {
537 Fprintf(stderr,
538 "traceroute6: invalid wait time.\n");
539 exit(1);
540 }
541 if (waittime <= 1) {
542 Fprintf(stderr,
543 "traceroute6: wait must be >1 sec.\n");
544 exit(1);
545 }
546 break;
547 default:
548 usage();
549 }
550 argc -= optind;
551 argv += optind;
552
553 if (argc < 1 || argc > 2)
554 usage();
555
556 #if 1
557 setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
558 #else
559 setlinebuf (stdout);
560 #endif
561
562 memset(&hints, 0, sizeof(hints));
563 hints.ai_family = PF_INET6;
564 hints.ai_socktype = SOCK_RAW;
565 hints.ai_protocol = IPPROTO_ICMPV6;
566 hints.ai_flags = AI_CANONNAME;
567 error = getaddrinfo(*argv, NULL, &hints, &res);
568 if (error) {
569 fprintf(stderr, "traceroute6: %s\n", gai_strerror(error));
570 exit(1);
571 }
572 if (res->ai_addrlen != sizeof(Dst)) {
573 fprintf(stderr, "traceroute6: size of sockaddr mismatch\n");
574 exit(1);
575 }
576 memcpy(&Dst, res->ai_addr, res->ai_addrlen);
577 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
578 if (!hostname) {
579 fprintf(stderr, "traceroute6: not enough core\n");
580 exit(1);
581 }
582
583 if (*++argv) {
584 ep = NULL;
585 datalen = strtoul(*argv, &ep, 0);
586 if (!*argv || *ep) {
587 Fprintf(stderr,
588 "traceroute6: invalid packet length.\n");
589 exit(1);
590 }
591 }
592 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) {
593 Fprintf(stderr,
594 "traceroute6: packet size must be 0 <= s < %ld.\n",
595 (long)(MAXPACKET - sizeof(struct opacket)));
596 exit(1);
597 }
598 datalen += sizeof(struct opacket);
599 outpacket = (struct opacket *)malloc((unsigned)datalen);
600 if (! outpacket) {
601 perror("malloc");
602 exit(1);
603 }
604 bzero((char *)outpacket, datalen);
605
606 /* initialize msghdr for receiving packets */
607 rcviov[0].iov_base = (caddr_t)packet;
608 rcviov[0].iov_len = sizeof(packet);
609 rcvmhdr.msg_name = (caddr_t)&Rcv;
610 rcvmhdr.msg_namelen = sizeof(Rcv);
611 rcvmhdr.msg_iov = rcviov;
612 rcvmhdr.msg_iovlen = 1;
613 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo))
614 + CMSG_SPACE(sizeof(int));
615 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
616 Fprintf(stderr, "traceroute6: malloc failed\n");
617 exit(1);
618 }
619 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
620 rcvmhdr.msg_controllen = rcvcmsglen;
621
622 if (options & SO_DEBUG)
623 setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
624 (char *)&on, sizeof(on));
625 if (options & SO_DONTROUTE)
626 setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
627 (char *)&on, sizeof(on));
628 #ifdef IPSEC
629 #ifdef IPSEC_POLICY_IPSEC
630 /*
631 * do not raise error even if setsockopt fails, kernel may have ipsec
632 * turned off.
633 */
634 if (setpolicy(rcvsock, "in bypass") < 0)
635 errx(1, "%s", ipsec_strerror());
636 if (setpolicy(rcvsock, "out bypass") < 0)
637 errx(1, "%s", ipsec_strerror());
638 #else
639 {
640 int level = IPSEC_LEVEL_NONE;
641
642 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
643 sizeof(level));
644 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
645 sizeof(level));
646 #ifdef IP_AUTH_TRANS_LEVEL
647 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
648 sizeof(level));
649 #else
650 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
651 sizeof(level));
652 #endif
653 #ifdef IP_AUTH_NETWORK_LEVEL
654 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
655 sizeof(level));
656 #endif
657 }
658 #endif /*IPSEC_POLICY_IPSEC*/
659 #endif /*IPSEC*/
660
661 /*
662 * Send UDP
663 */
664 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
665 perror("socket(SOCK_DGRAM)");
666 exit(5);
667 }
668 #ifdef SO_SNDBUF
669 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
670 sizeof(datalen)) < 0) {
671 perror("setsockopt(SO_SNDBUF)");
672 exit(6);
673 }
674 #endif /* SO_SNDBUF */
675 if (options & SO_DEBUG)
676 setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
677 (char *)&on, sizeof(on));
678 if (options & SO_DONTROUTE)
679 setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
680 (char *)&on, sizeof(on));
681 #ifdef USE_RFC2292BIS
682 if (rth) {/* XXX: there is no library to finalize the header... */
683 rth->ip6r_len = rth->ip6r_segleft * 2;
684 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR,
685 (void *)rth, (rth->ip6r_len + 1) << 3)) {
686 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n",
687 strerror(errno));
688 exit(1);
689 }
690 }
691 #else /* old advanced API */
692 if (cmsg != NULL) {
693 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
694 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
695 rtbuf, cmsg->cmsg_len) < 0) {
696 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n",
697 strerror(errno));
698 exit(1);
699 }
700 }
701 #endif /* USE_RFC2292BIS */
702 #ifdef IPSEC
703 #ifdef IPSEC_POLICY_IPSEC
704 /*
705 * do not raise error even if setsockopt fails, kernel may have ipsec
706 * turned off.
707 */
708 if (setpolicy(sndsock, "in bypass") < 0)
709 errx(1, "%s", ipsec_strerror());
710 if (setpolicy(sndsock, "out bypass") < 0)
711 errx(1, "%s", ipsec_strerror());
712 #else
713 {
714 int level = IPSEC_LEVEL_BYPASS;
715
716 setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
717 sizeof(level));
718 setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
719 sizeof(level));
720 #ifdef IP_AUTH_TRANS_LEVEL
721 setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
722 sizeof(level));
723 #else
724 setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
725 sizeof(level));
726 #endif
727 #ifdef IP_AUTH_NETWORK_LEVEL
728 setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
729 sizeof(level));
730 #endif
731 }
732 #endif /*IPSEC_POLICY_IPSEC*/
733 #endif /*IPSEC*/
734
735 /*
736 * Source selection
737 */
738 bzero(&Src, sizeof(Src));
739 if (source) {
740 struct addrinfo hints, *res;
741 int error;
742
743 memset(&hints, 0, sizeof(hints));
744 hints.ai_family = AF_INET6;
745 hints.ai_socktype = SOCK_DGRAM; /*dummy*/
746 hints.ai_flags = AI_NUMERICHOST;
747 error = getaddrinfo(source, "0", &hints, &res);
748 if (error) {
749 Printf("traceroute6: %s: %s\n", source,
750 gai_strerror(error));
751 exit(1);
752 }
753 if (res->ai_addrlen > sizeof(Src)) {
754 Printf("traceroute6: %s: %s\n", source,
755 gai_strerror(error));
756 exit(1);
757 }
758 memcpy(&Src, res->ai_addr, res->ai_addrlen);
759 freeaddrinfo(res);
760 } else {
761 struct sockaddr_in6 Nxt;
762 int dummy, len;
763
764 Nxt = Dst;
765 Nxt.sin6_port = htons(DUMMY_PORT);
766 if (cmsg != NULL)
767 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
768 sizeof(Nxt.sin6_addr));
769 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
770 perror("socket");
771 exit(1);
772 }
773 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
774 perror("connect");
775 exit(1);
776 }
777 len = sizeof(Src);
778 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
779 perror("getsockname");
780 exit(1);
781 }
782 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
783 src0, sizeof(src0), NULL, 0,
784 NI_NUMERICHOST | niflag)) {
785 Fprintf(stderr, "getnameinfo failed for source\n");
786 exit(1);
787 }
788 source = src0;
789 close(dummy);
790 }
791
792 #if 1
793 ident = (getpid() & 0xffff) | 0x8000;
794 #else
795 ident = 0; /*let the kernel pick one*/
796 #endif
797 Src.sin6_port = htons(ident);
798 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
799 perror("bind");
800 exit(1);
801 }
802
803 if (ident == 0) {
804 int len;
805
806 len = sizeof(Src);
807 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) {
808 perror("getsockname");
809 exit(1);
810 }
811 ident = ntohs(Src.sin6_port);
812 }
813
814 /*
815 * Message to users
816 */
817 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
818 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag))
819 strlcpy(hbuf, "(invalid)", sizeof(hbuf));
820 Fprintf(stderr, "traceroute6");
821 Fprintf(stderr, " to %s (%s)", hostname, hbuf);
822 if (source)
823 Fprintf(stderr, " from %s", source);
824 Fprintf(stderr,
825 ", %d hops max, %d byte packets\n",
826 max_hops, datalen);
827 fflush(stderr);
828
829 if (first_hop > 1)
830 Printf("Skipping %d intermediate hops\n", first_hop - 1);
831
832 /*
833 * Main loop
834 */
835 for (hops = first_hop; hops <= max_hops; ++hops) {
836 struct in6_addr lastaddr;
837 int got_there = 0;
838 int unreachable = 0;
839 int gotlastaddr = 0;
840
841 Printf("%2d ", hops);
842 bzero(&lastaddr, sizeof(lastaddr));
843 for (probe = 0; probe < nprobes; ++probe) {
844 int cc;
845 struct timeval t1, t2;
846 struct timezone tz;
847
848 gettimeofday(&t1, &tz);
849 send_probe(++seq, hops);
850 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
851 gettimeofday(&t2, &tz);
852 if ((i = packet_ok(&rcvmhdr, cc, seq))) {
853 if (!gotlastaddr ||
854 !IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
855 &lastaddr)) {
856 if (gotlastaddr)
857 printf("\n ");
858 print(&rcvmhdr, cc);
859 lastaddr = Rcv.sin6_addr;
860 ++gotlastaddr;
861 }
862 Printf(" %g ms", deltaT(&t1, &t2));
863 switch(i - 1) {
864 case ICMP6_DST_UNREACH_NOROUTE:
865 ++unreachable;
866 Printf(" !N");
867 break;
868 case ICMP6_DST_UNREACH_ADMIN:
869 ++unreachable;
870 Printf(" !P");
871 break;
872 case ICMP6_DST_UNREACH_NOTNEIGHBOR:
873 ++unreachable;
874 Printf(" !S");
875 break;
876 case ICMP6_DST_UNREACH_ADDR:
877 ++unreachable;
878 Printf(" !A");
879 break;
880 case ICMP6_DST_UNREACH_NOPORT:
881 if (rcvhlim >= 0 &&
882 rcvhlim <= 1)
883 Printf(" !");
884 ++got_there;
885 break;
886 }
887 break;
888 }
889 }
890 if (cc == 0)
891 Printf(" *");
892 fflush(stdout);
893 }
894 putchar('\n');
895 if (got_there ||
896 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
897 exit(0);
898 }
899 }
900
901 exit(0);
902 }
903
904 int
905 wait_for_reply(int sock, struct msghdr *mhdr)
906 {
907 #ifdef HAVE_POLL
908 struct pollfd pfd[1];
909 int cc = 0;
910
911 pfd[0].fd = sock;
912 pfd[0].events = POLLIN;
913 pfd[0].revents = 0;
914
915 if (poll(pfd, 1, waittime * 1000) > 0)
916 cc = recvmsg(rcvsock, mhdr, 0);
917
918 return(cc);
919 #else
920 fd_set *fdsp;
921 struct timeval wait;
922 int cc = 0, fdsn;
923
924 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
925 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
926 err(1, "malloc");
927 memset(fdsp, 0, fdsn);
928 FD_SET(sock, fdsp);
929 wait.tv_sec = waittime; wait.tv_usec = 0;
930
931 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
932 cc = recvmsg(rcvsock, mhdr, 0);
933
934 free(fdsp);
935 return(cc);
936 #endif
937 }
938
939 #ifdef IPSEC
940 #ifdef IPSEC_POLICY_IPSEC
941 int
942 setpolicy(int so, char *policy)
943 {
944 char *buf;
945
946 buf = ipsec_set_policy(policy, strlen(policy));
947 if (buf == NULL) {
948 warnx("%s", ipsec_strerror());
949 return -1;
950 }
951 setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
952 buf, ipsec_get_policylen(buf));
953
954 free(buf);
955
956 return 0;
957 }
958 #endif
959 #endif
960
961 void
962 send_probe(int seq, int hops)
963 {
964 struct opacket *op = outpacket;
965 int i;
966
967 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
968 (char *)&hops, sizeof(hops)) < 0) {
969 perror("setsockopt IPV6_UNICAST_HOPS");
970 }
971
972 Dst.sin6_port = htons(port + seq);
973
974 op->seq = seq;
975 op->hops = hops;
976 gettimeofday(&op->tv, &tz);
977
978 i = sendto(sndsock, (char *)outpacket, datalen , 0,
979 (struct sockaddr *)&Dst, Dst.sin6_len);
980 if (i < 0 || i != datalen) {
981 if (i<0)
982 perror("sendto");
983 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname,
984 datalen, i);
985 fflush(stdout);
986 }
987 }
988
989 int
990 get_hoplim(struct msghdr *mhdr)
991 {
992 struct cmsghdr *cm;
993
994 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
995 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
996 if (cm->cmsg_level == IPPROTO_IPV6 &&
997 cm->cmsg_type == IPV6_HOPLIMIT &&
998 cm->cmsg_len == CMSG_LEN(sizeof(int)))
999 return(*(int *)CMSG_DATA(cm));
1000 }
1001
1002 return(-1);
1003 }
1004
1005 double
1006 deltaT(struct timeval *t1p, struct timeval *t2p)
1007 {
1008 double dt;
1009
1010 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
1011 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
1012 return (dt);
1013 }
1014
1015
1016 /*
1017 * Convert an ICMP "type" field to a printable string.
1018 */
1019 char *
1020 pr_type(int t0)
1021 {
1022 u_char t = t0 & 0xff;
1023 char *cp;
1024
1025 switch (t) {
1026 case ICMP6_DST_UNREACH:
1027 cp = "Destination Unreachable";
1028 break;
1029 case ICMP6_PACKET_TOO_BIG:
1030 cp = "Pakcet Too Big";
1031 break;
1032 case ICMP6_TIME_EXCEEDED:
1033 cp = "Time Exceeded";
1034 break;
1035 case ICMP6_PARAM_PROB:
1036 cp = "Parameter Problem";
1037 break;
1038 case ICMP6_ECHO_REQUEST:
1039 cp = "Echo Request";
1040 break;
1041 case ICMP6_ECHO_REPLY:
1042 cp = "Echo Reply";
1043 break;
1044 case ICMP6_MEMBERSHIP_QUERY:
1045 cp = "Group Membership Query";
1046 break;
1047 case ICMP6_MEMBERSHIP_REPORT:
1048 cp = "Group Membership Report";
1049 break;
1050 case ICMP6_MEMBERSHIP_REDUCTION:
1051 cp = "Group Membership Reduction";
1052 break;
1053 case ND_ROUTER_SOLICIT:
1054 cp = "Router Solicitation";
1055 break;
1056 case ND_ROUTER_ADVERT:
1057 cp = "Router Advertisement";
1058 break;
1059 case ND_NEIGHBOR_SOLICIT:
1060 cp = "Neighbor Solicitation";
1061 break;
1062 case ND_NEIGHBOR_ADVERT:
1063 cp = "Neighbor Advertisement";
1064 break;
1065 case ND_REDIRECT:
1066 cp = "Redirect";
1067 break;
1068 default:
1069 cp = "Unknown";
1070 break;
1071 }
1072 return cp;
1073 }
1074
1075
1076 int
1077 packet_ok(struct msghdr *mhdr, int cc, int seq)
1078 {
1079 struct icmp6_hdr *icp;
1080 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1081 u_char type, code;
1082 char *buf = (char *)mhdr->msg_iov[0].iov_base;
1083 struct cmsghdr *cm;
1084 int *hlimp;
1085 char hbuf[NI_MAXHOST];
1086
1087 #ifdef OLDRAWSOCKET
1088 int hlen;
1089 struct ip6_hdr *ip;
1090 #endif
1091
1092 #ifdef OLDRAWSOCKET
1093 ip = (struct ip6_hdr *) buf;
1094 hlen = sizeof(struct ip6_hdr);
1095 if (cc < hlen + sizeof(struct icmp6_hdr)) {
1096 if (verbose) {
1097 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1098 hbuf, sizeof(hbuf), NULL, 0,
1099 NI_NUMERICHOST | niflag) != 0)
1100 strlcpy(hbuf, "invalid", sizeof(hbuf));
1101 Printf("packet too short (%d bytes) from %s\n", cc,
1102 hbuf);
1103 }
1104 return (0);
1105 }
1106 cc -= hlen;
1107 icp = (struct icmp6_hdr *)(buf + hlen);
1108 #else
1109 if (cc < sizeof(struct icmp6_hdr)) {
1110 if (verbose) {
1111 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1112 hbuf, sizeof(hbuf), NULL, 0,
1113 NI_NUMERICHOST | niflag) != 0)
1114 strlcpy(hbuf, "invalid", sizeof(hbuf));
1115 Printf("data too short (%d bytes) from %s\n", cc, hbuf);
1116 }
1117 return(0);
1118 }
1119 icp = (struct icmp6_hdr *)buf;
1120 #endif
1121 /* get optional information via advanced API */
1122 rcvpktinfo = NULL;
1123 hlimp = NULL;
1124 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
1125 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
1126 if (cm->cmsg_level == IPPROTO_IPV6 &&
1127 cm->cmsg_type == IPV6_PKTINFO &&
1128 cm->cmsg_len ==
1129 CMSG_LEN(sizeof(struct in6_pktinfo)))
1130 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
1131
1132 if (cm->cmsg_level == IPPROTO_IPV6 &&
1133 cm->cmsg_type == IPV6_HOPLIMIT &&
1134 cm->cmsg_len == CMSG_LEN(sizeof(int)))
1135 hlimp = (int *)CMSG_DATA(cm);
1136 }
1137 if (rcvpktinfo == NULL || hlimp == NULL) {
1138 warnx("failed to get received hop limit or packet info");
1139 #if 0
1140 return(0);
1141 #else
1142 rcvhlim = 0; /*XXX*/
1143 #endif
1144 }
1145 else
1146 rcvhlim = *hlimp;
1147
1148 type = icp->icmp6_type;
1149 code = icp->icmp6_code;
1150 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
1151 || type == ICMP6_DST_UNREACH) {
1152 struct ip6_hdr *hip;
1153 struct udphdr *up;
1154
1155 hip = (struct ip6_hdr *)(icp + 1);
1156 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
1157 if (verbose)
1158 warnx("failed to get upper layer header");
1159 return(0);
1160 }
1161 if (up->uh_sport == htons(ident) &&
1162 up->uh_dport == htons(port+seq))
1163 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
1164 }
1165 if (verbose) {
1166 int i;
1167 u_int8_t *p;
1168 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
1169
1170 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1171 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
1172 strlcpy(sbuf, "invalid", sizeof(hbuf));
1173 Printf("\n%d bytes from %s to %s", cc, sbuf,
1174 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1175 dbuf, sizeof(dbuf))
1176 : "?");
1177 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
1178 icp->icmp6_code);
1179 p = (u_int8_t *)(icp + 1);
1180 #define WIDTH 16
1181 for (i = 0; i < cc; i++) {
1182 if (i % WIDTH == 0)
1183 Printf("%04x:", i);
1184 if (i % 4 == 0)
1185 Printf(" ");
1186 Printf("%02x", p[i]);
1187 if (i % WIDTH == WIDTH - 1)
1188 Printf("\n");
1189 }
1190 if (cc % WIDTH != 0)
1191 Printf("\n");
1192 }
1193 return(0);
1194 }
1195
1196 /*
1197 * Increment pointer until find the UDP header.
1198 */
1199 struct udphdr *
1200 get_udphdr(struct ip6_hdr *ip6, u_char *lim)
1201 {
1202 u_char *cp = (u_char *)ip6, nh;
1203 int hlen;
1204
1205 if (cp + sizeof(*ip6) >= lim)
1206 return(NULL);
1207
1208 nh = ip6->ip6_nxt;
1209 cp += sizeof(struct ip6_hdr);
1210
1211 while(lim - cp >= 8) {
1212 switch(nh) {
1213 case IPPROTO_ESP:
1214 case IPPROTO_TCP:
1215 case IPPROTO_ICMPV6:
1216 return(NULL);
1217 case IPPROTO_UDP:
1218 return((struct udphdr *)cp);
1219 case IPPROTO_FRAGMENT:
1220 hlen = sizeof(struct ip6_frag);
1221 nh = ((struct ip6_frag *)cp)->ip6f_nxt;
1222 break;
1223 case IPPROTO_AH:
1224 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
1225 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1226 break;
1227 default:
1228 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
1229 nh = ((struct ip6_ext *)cp)->ip6e_nxt;
1230 break;
1231 }
1232
1233 cp += hlen;
1234 }
1235
1236 return(NULL);
1237 }
1238
1239 void
1240 print(struct msghdr *mhdr, int cc)
1241 {
1242 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
1243 char hbuf[NI_MAXHOST];
1244
1245 if (getnameinfo((struct sockaddr *)from, from->sin6_len,
1246 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0)
1247 strlcpy(hbuf, "invalid", sizeof(hbuf));
1248 if (nflag)
1249 Printf(" %s", hbuf);
1250 else if (lflag)
1251 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
1252 else
1253 Printf(" %s", inetname((struct sockaddr *)from));
1254
1255 if (verbose) {
1256 #ifdef OLDRAWSOCKET
1257 Printf(" %d bytes to %s", cc,
1258 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1259 hbuf, sizeof(hbuf))
1260 : "?");
1261 #else
1262 Printf(" %d bytes of data to %s", cc,
1263 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
1264 hbuf, sizeof(hbuf))
1265 : "?");
1266 #endif
1267 }
1268 }
1269
1270 /*
1271 * Subtract 2 timeval structs: out = out - in.
1272 * Out is assumed to be >= in.
1273 */
1274 void
1275 tvsub(struct timeval *out, struct timeval *in)
1276 {
1277 if ((out->tv_usec -= in->tv_usec) < 0) {
1278 out->tv_sec--;
1279 out->tv_usec += 1000000;
1280 }
1281 out->tv_sec -= in->tv_sec;
1282 }
1283
1284
1285 /*
1286 * Construct an Internet address representation.
1287 * If the nflag has been supplied, give
1288 * numeric value, otherwise try for symbolic name.
1289 */
1290 const char *
1291 inetname(struct sockaddr *sa)
1292 {
1293 char *cp;
1294 static char line[NI_MAXHOST];
1295 static char domain[MAXHOSTNAMELEN + 1];
1296 static int first = 1;
1297
1298 if (first && !nflag) {
1299 first = 0;
1300 if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
1301 (cp = strchr(domain, '.')))
1302 strlcpy(domain, cp + 1, sizeof(domain));
1303 else
1304 domain[0] = 0;
1305 }
1306 cp = NULL;
1307 if (!nflag) {
1308 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1309 NI_NAMEREQD) == 0) {
1310 if ((cp = strchr(line, '.')) &&
1311 !strcmp(cp + 1, domain))
1312 *cp = 0;
1313 cp = line;
1314 }
1315 }
1316 if (cp)
1317 return cp;
1318
1319 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
1320 NI_NUMERICHOST | niflag) != 0)
1321 strlcpy(line, "invalid", sizeof(line));
1322 return line;
1323 }
1324
1325 void
1326 usage(void)
1327 {
1328 fprintf(stderr,
1329 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n"
1330 " [-q probes] [-s src] [-w waittime] target [datalen]\n");
1331 exit(1);
1332 }
DragonFly BSD