traceroute6.c revision 66808
1/* $KAME: traceroute6.c,v 1.32 2000/07/07 12:21:34 itojun Exp $ */ 2 3/* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32/*- 33 * Copyright (c) 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Van Jacobson. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 68#ifndef lint 69static char copyright[] = 70"@(#) Copyright (c) 1990, 1993\n\ 71 The Regents of the University of California. All rights reserved.\n"; 72#endif /* not lint */ 73 74#ifndef lint 75#if 0 76static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 77#endif 78static const char rcsid[] = 79 "$FreeBSD: head/usr.sbin/traceroute6/traceroute6.c 66808 2000-10-08 07:52:08Z kris $"; 80#endif /* not lint */ 81 82/* 83 * traceroute host - trace the route ip packets follow going to "host". 84 * 85 * Attempt to trace the route an ip packet would follow to some 86 * internet host. We find out intermediate hops by launching probe 87 * packets with a small ttl (time to live) then listening for an 88 * icmp "time exceeded" reply from a gateway. We start our probes 89 * with a ttl of one and increase by one until we get an icmp "port 90 * unreachable" (which means we got to "host") or hit a max (which 91 * defaults to 30 hops & can be changed with the -m flag). Three 92 * probes (change with -q flag) are sent at each ttl setting and a 93 * line is printed showing the ttl, address of the gateway and 94 * round trip time of each probe. If the probe answers come from 95 * different gateways, the address of each responding system will 96 * be printed. If there is no response within a 5 sec. timeout 97 * interval (changed with the -w flag), a "*" is printed for that 98 * probe. 99 * 100 * Probe packets are UDP format. We don't want the destination 101 * host to process them so the destination port is set to an 102 * unlikely value (if some clod on the destination is using that 103 * value, it can be changed with the -p flag). 104 * 105 * A sample use might be: 106 * 107 * [yak 71]% traceroute nis.nsf.net. 108 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 109 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 110 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 111 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 112 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 113 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 114 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 115 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 116 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 117 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 118 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 119 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 120 * 121 * Note that lines 2 & 3 are the same. This is due to a buggy 122 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 123 * packets with a zero ttl. 124 * 125 * A more interesting example is: 126 * 127 * [yak 72]% traceroute allspice.lcs.mit.edu. 128 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 129 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 130 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 131 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 132 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 133 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 134 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 135 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 136 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 137 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 138 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 139 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 140 * 12 * * * 141 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 142 * 14 * * * 143 * 15 * * * 144 * 16 * * * 145 * 17 * * * 146 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 147 * 148 * (I start to see why I'm having so much trouble with mail to 149 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 150 * either don't send ICMP "time exceeded" messages or send them 151 * with a ttl too small to reach us. 14 - 17 are running the 152 * MIT C Gateway code that doesn't send "time exceeded"s. God 153 * only knows what's going on with 12. 154 * 155 * The silent gateway 12 in the above may be the result of a bug in 156 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 157 * sends an unreachable message using whatever ttl remains in the 158 * original datagram. Since, for gateways, the remaining ttl is 159 * zero, the icmp "time exceeded" is guaranteed to not make it back 160 * to us. The behavior of this bug is slightly more interesting 161 * when it appears on the destination system: 162 * 163 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 164 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 165 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 166 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 167 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 168 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 169 * 7 * * * 170 * 8 * * * 171 * 9 * * * 172 * 10 * * * 173 * 11 * * * 174 * 12 * * * 175 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 176 * 177 * Notice that there are 12 "gateways" (13 is the final 178 * destination) and exactly the last half of them are "missing". 179 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 180 * is using the ttl from our arriving datagram as the ttl in its 181 * icmp reply. So, the reply will time out on the return path 182 * (with no notice sent to anyone since icmp's aren't sent for 183 * icmp's) until we probe with a ttl that's at least twice the path 184 * length. I.e., rip is really only 7 hops away. A reply that 185 * returns with a ttl of 1 is a clue this problem exists. 186 * Traceroute prints a "!" after the time if the ttl is <= 1. 187 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 188 * non-standard (HPUX) software, expect to see this problem 189 * frequently and/or take care picking the target host of your 190 * probes. 191 * 192 * Other possible annotations after the time are !H, !N, !P (got a host, 193 * network or protocol unreachable, respectively), !S or !F (source 194 * route failed or fragmentation needed -- neither of these should 195 * ever occur and the associated gateway is busted if you see one). If 196 * almost all the probes result in some kind of unreachable, traceroute 197 * will give up and exit. 198 * 199 * Notes 200 * ----- 201 * This program must be run by root or be setuid. (I suggest that 202 * you *don't* make it setuid -- casual use could result in a lot 203 * of unnecessary traffic on our poor, congested nets.) 204 * 205 * This program requires a kernel mod that does not appear in any 206 * system available from Berkeley: A raw ip socket using proto 207 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 208 * opposed to data to be wrapped in a ip datagram). See the README 209 * file that came with the source to this program for a description 210 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 211 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 212 * MODIFIED TO RUN THIS PROGRAM. 213 * 214 * The udp port usage may appear bizarre (well, ok, it is bizarre). 215 * The problem is that an icmp message only contains 8 bytes of 216 * data from the original datagram. 8 bytes is the size of a udp 217 * header so, if we want to associate replies with the original 218 * datagram, the necessary information must be encoded into the 219 * udp header (the ip id could be used but there's no way to 220 * interlock with the kernel's assignment of ip id's and, anyway, 221 * it would have taken a lot more kernel hacking to allow this 222 * code to set the ip id). So, to allow two or more users to 223 * use traceroute simultaneously, we use this task's pid as the 224 * source port (the high bit is set to move the port number out 225 * of the "likely" range). To keep track of which probe is being 226 * replied to (so times and/or hop counts don't get confused by a 227 * reply that was delayed in transit), we increment the destination 228 * port number before each probe. 229 * 230 * Don't use this as a coding example. I was trying to find a 231 * routing problem and this code sort-of popped out after 48 hours 232 * without sleep. I was amazed it ever compiled, much less ran. 233 * 234 * I stole the idea for this program from Steve Deering. Since 235 * the first release, I've learned that had I attended the right 236 * IETF working group meetings, I also could have stolen it from Guy 237 * Almes or Matt Mathis. I don't know (or care) who came up with 238 * the idea first. I envy the originators' perspicacity and I'm 239 * glad they didn't keep the idea a secret. 240 * 241 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 242 * enhancements to the original distribution. 243 * 244 * I've hacked up a round-trip-route version of this that works by 245 * sending a loose-source-routed udp datagram through the destination 246 * back to yourself. Unfortunately, SO many gateways botch source 247 * routing, the thing is almost worthless. Maybe one day... 248 * 249 * -- Van Jacobson (van@helios.ee.lbl.gov) 250 * Tue Dec 20 03:50:13 PST 1988 251 */ 252 253#include <sys/param.h> 254#include <sys/time.h> 255#include <sys/socket.h> 256#include <sys/uio.h> 257#include <sys/file.h> 258#include <sys/ioctl.h> 259 260#include <netinet/in.h> 261 262#include <arpa/inet.h> 263 264#include <netdb.h> 265#include <stdio.h> 266#include <err.h> 267#ifdef HAVE_POLL 268#include <poll.h> 269#endif 270#include <errno.h> 271#include <stdlib.h> 272#include <string.h> 273#include <unistd.h> 274 275#include <netinet/ip6.h> 276#include <netinet/icmp6.h> 277#include <netinet/udp.h> 278 279#ifdef IPSEC 280#include <net/route.h> 281#include <netinet6/ipsec.h> 282#endif 283 284#define DUMMY_PORT 10010 285 286#define MAXPACKET 65535 /* max ip packet size */ 287#ifndef MAXHOSTNAMELEN 288#define MAXHOSTNAMELEN 64 289#endif 290 291#ifndef FD_SET 292#define NFDBITS (8*sizeof(fd_set)) 293#define FD_SETSIZE NFDBITS 294#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) 295#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) 296#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) 297#define FD_ZERO(p) bzero((char *)(p), sizeof(*(p))) 298#endif 299 300#define Fprintf (void)fprintf 301#define Sprintf (void)sprintf 302#define Printf (void)printf 303 304#ifndef HAVE_GETIPNODEBYNAME 305#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 306#define freehostent(x) 307#endif 308 309/* 310 * format of a (udp) probe packet. 311 */ 312struct opacket { 313 u_char seq; /* sequence number of this packet */ 314 u_char hops; /* hop limit of the packet */ 315 struct timeval tv; /* time packet left */ 316}; 317 318u_char packet[512]; /* last inbound (icmp) packet */ 319struct opacket *outpacket; /* last output (udp) packet */ 320 321int main __P((int, char *[])); 322int wait_for_reply __P((int, struct msghdr *)); 323#ifdef IPSEC 324#ifdef IPSEC_POLICY_IPSEC 325int setpolicy __P((int so, char *policy)); 326#endif 327#endif 328void send_probe __P((int, int)); 329struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 330int get_hoplim __P((struct msghdr *)); 331double deltaT __P((struct timeval *, struct timeval *)); 332char *pr_type __P((int)); 333int packet_ok __P((struct msghdr *, int, int)); 334void print __P((struct msghdr *, int)); 335void tvsub __P((struct timeval *, struct timeval *)); 336const char *inetname __P((struct sockaddr *)); 337void usage __P((void)); 338 339int rcvsock; /* receive (icmp) socket file descriptor */ 340int sndsock; /* send (udp) socket file descriptor */ 341struct timezone tz; /* leftover */ 342 343struct msghdr rcvmhdr; 344struct iovec rcviov[2]; 345int rcvhlim; 346struct in6_pktinfo *rcvpktinfo; 347 348struct sockaddr_in6 Src, Dst, Rcv; 349int datalen; /* How much data */ 350/* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 351char rtbuf[2064]; 352#ifdef USE_RFC2292BIS 353struct ip6_rthdr *rth; 354#endif 355struct cmsghdr *cmsg; 356 357char *source = 0; 358char *hostname; 359 360int nprobes = 3; 361int first_hop = 1; 362int max_hops = 30; 363u_short ident; 364u_short port = 32768+666; /* start udp dest port # for probe packets */ 365int options; /* socket options */ 366int verbose; 367int waittime = 5; /* time to wait for response (in seconds) */ 368int nflag; /* print addresses numerically */ 369int lflag; /* print both numerical address & hostname */ 370 371#ifdef KAME_SCOPEID 372const int niflag = NI_WITHSCOPEID; 373#else 374const int niflag = 0; 375#endif 376 377int 378main(argc, argv) 379 int argc; 380 char *argv[]; 381{ 382 struct hostent *hp; 383 int error; 384 struct addrinfo hints, *res; 385 int ch, i, on, probe, seq, hops, rcvcmsglen; 386 static u_char *rcvcmsgbuf; 387 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 388 389 /* 390 * Receive ICMP 391 */ 392 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 393 perror("socket(ICMPv6)"); 394 exit(5); 395 } 396 397 /* set a minimum set of socket options */ 398 on = 1; 399 /* specify to tell receiving interface */ 400#ifdef IPV6_RECVPKTINFO 401 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 402 sizeof(on)) < 0) 403 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 404#else /* old adv. API */ 405 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 406 sizeof(on)) < 0) 407 err(1, "setsockopt(IPV6_PKTINFO)"); 408#endif 409 410 /* specify to tell value of hoplimit field of received IP6 hdr */ 411#ifdef IPV6_RECVHOPLIMIT 412 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 413 sizeof(on)) < 0) 414 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 415#else /* old adv. API */ 416 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 417 sizeof(on)) < 0) 418 err(1, "setsockopt(IPV6_HOPLIMIT)"); 419#endif 420 421 /* revoke privs */ 422 seteuid(getuid()); 423 setuid(getuid()); 424 425 seq = 0; 426 427 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != EOF) 428 switch(ch) { 429 case 'd': 430 options |= SO_DEBUG; 431 break; 432 case 'f': 433 first_hop = atoi(optarg); 434 if (first_hop > max_hops) { 435 Fprintf(stderr, 436 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 437 exit(1); 438 } 439 break; 440 case 'g': 441 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 442 if (hp == NULL) { 443 Fprintf(stderr, 444 "traceroute6: unknown host %s\n", optarg); 445 exit(1); 446 } 447#ifdef USE_RFC2292BIS 448 if (rth == NULL) { 449 /* 450 * XXX: We can't detect the number of 451 * intermediate nodes yet. 452 */ 453 if ((rth = inet6_rth_init((void *)rtbuf, 454 sizeof(rtbuf), 455 IPV6_RTHDR_TYPE_0, 456 0)) == NULL) { 457 Fprintf(stderr, 458 "inet6_rth_init failed.\n"); 459 exit(1); 460 } 461 } 462 if (inet6_rth_add((void *)rth, 463 (struct in6_addr *)hp->h_addr)) { 464 Fprintf(stderr, 465 "inet6_rth_add failed for %s\n", 466 optarg); 467 exit(1); 468 } 469#else /* old advanced API */ 470 if (cmsg == NULL) 471 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 472 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 473#endif 474 freehostent(hp); 475 break; 476 case 'l': 477 lflag++; 478 break; 479 case 'm': 480 max_hops = atoi(optarg); 481 if (max_hops < first_hop) { 482 Fprintf(stderr, 483 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 484 exit(1); 485 } 486 break; 487 case 'n': 488 nflag++; 489 break; 490 case 'p': 491 port = atoi(optarg); 492 if (port < 1) { 493 Fprintf(stderr, 494 "traceroute6: port must be >0.\n"); 495 exit(1); 496 } 497 break; 498 case 'q': 499 nprobes = atoi(optarg); 500 if (nprobes < 1) { 501 Fprintf(stderr, 502 "traceroute6: nprobes must be >0.\n"); 503 exit(1); 504 } 505 break; 506 case 'r': 507 options |= SO_DONTROUTE; 508 break; 509 case 's': 510 /* 511 * set the ip source address of the outbound 512 * probe (e.g., on a multi-homed host). 513 */ 514 source = optarg; 515 break; 516 case 'v': 517 verbose++; 518 break; 519 case 'w': 520 waittime = atoi(optarg); 521 if (waittime <= 1) { 522 Fprintf(stderr, 523 "traceroute6: wait must be >1 sec.\n"); 524 exit(1); 525 } 526 break; 527 default: 528 usage(); 529 } 530 argc -= optind; 531 argv += optind; 532 533 if (argc < 1) 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 (void)fprintf(stderr, 550 "traceroute6: %s\n", gai_strerror(error)); 551 exit(1); 552 } 553 if (res->ai_addrlen != sizeof(Dst)) { 554 (void)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; 560 561 if (*++argv) 562 datalen = atoi(*argv); 563 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 564 Fprintf(stderr, 565 "traceroute6: packet size must be 0 <= s < %ld.\n", 566 (long)(MAXPACKET - sizeof(struct opacket))); 567 exit(1); 568 } 569 datalen += sizeof(struct opacket); 570 outpacket = (struct opacket *)malloc((unsigned)datalen); 571 if (! outpacket) { 572 perror("malloc"); 573 exit(1); 574 } 575 (void) bzero((char *)outpacket, datalen); 576 577 /* initialize msghdr for receiving packets */ 578 rcviov[0].iov_base = (caddr_t)packet; 579 rcviov[0].iov_len = sizeof(packet); 580 rcvmhdr.msg_name = (caddr_t)&Rcv; 581 rcvmhdr.msg_namelen = sizeof(Rcv); 582 rcvmhdr.msg_iov = rcviov; 583 rcvmhdr.msg_iovlen = 1; 584 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 585 + CMSG_SPACE(sizeof(int)); 586 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 587 Fprintf(stderr, "traceroute6: malloc failed\n"); 588 exit(1); 589 } 590 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 591 rcvmhdr.msg_controllen = rcvcmsglen; 592 593 if (options & SO_DEBUG) 594 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 595 (char *)&on, sizeof(on)); 596 if (options & SO_DONTROUTE) 597 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 598 (char *)&on, sizeof(on)); 599#ifdef IPSEC 600#ifdef IPSEC_POLICY_IPSEC 601 /* 602 * do not raise error even if setsockopt fails, kernel may have ipsec 603 * turned off. 604 */ 605 if (setpolicy(rcvsock, "in bypass") < 0) 606 errx(1, "%s", ipsec_strerror()); 607 if (setpolicy(rcvsock, "out bypass") < 0) 608 errx(1, "%s", ipsec_strerror()); 609#else 610 { 611 int level = IPSEC_LEVEL_NONE; 612 613 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 614 sizeof(level)); 615 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 616 sizeof(level)); 617#ifdef IP_AUTH_TRANS_LEVEL 618 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 619 sizeof(level)); 620#else 621 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 622 sizeof(level)); 623#endif 624#ifdef IP_AUTH_NETWORK_LEVEL 625 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 626 sizeof(level)); 627#endif 628 } 629#endif /*IPSEC_POLICY_IPSEC*/ 630#endif /*IPSEC*/ 631 632 /* 633 * Send UDP 634 */ 635 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 636 perror("socket(SOCK_DGRAM)"); 637 exit(5); 638 } 639#ifdef SO_SNDBUF 640 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 641 sizeof(datalen)) < 0) { 642 perror("setsockopt(SO_SNDBUF)"); 643 exit(6); 644 } 645#endif /* SO_SNDBUF */ 646 if (options & SO_DEBUG) 647 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 648 (char *)&on, sizeof(on)); 649 if (options & SO_DONTROUTE) 650 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 651 (char *)&on, sizeof(on)); 652#ifdef USE_RFC2292BIS 653 if (rth) {/* XXX: there is no library to finalize the header... */ 654 rth->ip6r_len = rth->ip6r_segleft * 2; 655 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 656 (void *)rth, (rth->ip6r_len + 1) << 3)) { 657 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 658 strerror(errno)); 659 exit(1); 660 } 661 } 662#else /* old advanced API */ 663 if (cmsg != NULL) { 664 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 665 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 666 rtbuf, cmsg->cmsg_len) < 0) { 667 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 668 strerror(errno)); 669 exit(1); 670 } 671 } 672#endif /* USE_RFC2292BIS */ 673#ifdef IPSEC 674#ifdef IPSEC_POLICY_IPSEC 675 /* 676 * do not raise error even if setsockopt fails, kernel may have ipsec 677 * turned off. 678 */ 679 if (setpolicy(sndsock, "in bypass") < 0) 680 errx(1, "%s", ipsec_strerror()); 681 if (setpolicy(sndsock, "out bypass") < 0) 682 errx(1, "%s", ipsec_strerror()); 683#else 684 { 685 int level = IPSEC_LEVEL_BYPASS; 686 687 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 688 sizeof(level)); 689 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 690 sizeof(level)); 691#ifdef IP_AUTH_TRANS_LEVEL 692 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 693 sizeof(level)); 694#else 695 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 696 sizeof(level)); 697#endif 698#ifdef IP_AUTH_NETWORK_LEVEL 699 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 700 sizeof(level)); 701#endif 702 } 703#endif /*IPSEC_POLICY_IPSEC*/ 704#endif /*IPSEC*/ 705 706 /* 707 * Source selection 708 */ 709 bzero(&Src, sizeof(Src)); 710 if (source) { 711 struct addrinfo hints, *res; 712 int error; 713 714 memset(&hints, 0, sizeof(hints)); 715 hints.ai_family = AF_INET6; 716 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 717 hints.ai_flags = AI_NUMERICHOST; 718 error = getaddrinfo(source, "0", &hints, &res); 719 if (error) { 720 Printf("traceroute6: %s: %s\n", source, 721 gai_strerror(error)); 722 exit(1); 723 } 724 if (res->ai_addrlen > sizeof(Src)) { 725 Printf("traceroute6: %s: %s\n", source, 726 gai_strerror(error)); 727 exit(1); 728 } 729 memcpy(&Src, res->ai_addr, res->ai_addrlen); 730 freeaddrinfo(res); 731 } else { 732 struct sockaddr_in6 Nxt; 733 int dummy, len; 734 735 Nxt = Dst; 736 Nxt.sin6_port = htons(DUMMY_PORT); 737 if (cmsg != NULL) 738 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 739 sizeof(Nxt.sin6_addr)); 740 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 741 perror("socket"); 742 exit(1); 743 } 744 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 745 perror("connect"); 746 exit(1); 747 } 748 len = sizeof(Src); 749 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 750 perror("getsockname"); 751 exit(1); 752 } 753 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 754 src0, sizeof(src0), NULL, 0, 755 NI_NUMERICHOST | niflag)) { 756 Fprintf(stderr, "getnameinfo failed for source\n"); 757 exit(1); 758 } 759 source = src0; 760 close(dummy); 761 } 762 763#if 1 764 ident = (getpid() & 0xffff) | 0x8000; 765#else 766 ident = 0; /*let the kernel pick one*/ 767#endif 768 Src.sin6_port = htons(ident); 769 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 770 perror("bind"); 771 exit(1); 772 } 773 774 if (ident == 0) { 775 int len; 776 777 len = sizeof(Src); 778 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 779 perror("getsockname"); 780 exit(1); 781 } 782 ident = ntohs(Src.sin6_port); 783 } 784 785 /* 786 * Message to users 787 */ 788 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 789 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag)) 790 strcpy(hbuf, "(invalid)"); 791 Fprintf(stderr, "traceroute6"); 792 Fprintf(stderr, " to %s (%s)", hostname, hbuf); 793 if (source) 794 Fprintf(stderr, " from %s", source); 795 Fprintf(stderr, 796 ", %d hops max, %d byte packets\n", 797 max_hops, datalen); 798 (void) fflush(stderr); 799 800 if (first_hop > 1) 801 Printf("Skipping %d intermediate hops\n", first_hop - 1); 802 803 /* 804 * Main loop 805 */ 806 for (hops = first_hop; hops <= max_hops; ++hops) { 807 struct in6_addr lastaddr; 808 int got_there = 0; 809 int unreachable = 0; 810 811 Printf("%2d ", hops); 812 bzero(&lastaddr, sizeof(lastaddr)); 813 for (probe = 0; probe < nprobes; ++probe) { 814 int cc; 815 struct timeval t1, t2; 816 struct timezone tz; 817 818 (void) gettimeofday(&t1, &tz); 819 send_probe(++seq, hops); 820 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 821 (void) gettimeofday(&t2, &tz); 822 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 823 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 824 &lastaddr)) { 825 print(&rcvmhdr, cc); 826 lastaddr = Rcv.sin6_addr; 827 } 828 Printf(" %g ms", deltaT(&t1, &t2)); 829 switch(i - 1) { 830 case ICMP6_DST_UNREACH_NOROUTE: 831 ++unreachable; 832 Printf(" !N"); 833 break; 834 case ICMP6_DST_UNREACH_ADMIN: 835 ++unreachable; 836 Printf(" !P"); 837 break; 838 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 839 ++unreachable; 840 Printf(" !S"); 841 break; 842 case ICMP6_DST_UNREACH_ADDR: 843 ++unreachable; 844 Printf(" !A"); 845 break; 846 case ICMP6_DST_UNREACH_NOPORT: 847 if (rcvhlim >= 0 && 848 rcvhlim <= 1) 849 Printf(" !"); 850 ++got_there; 851 break; 852 } 853 break; 854 } 855 } 856 if (cc == 0) 857 Printf(" *"); 858 (void) fflush(stdout); 859 } 860 putchar('\n'); 861 if (got_there || 862 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 863 exit(0); 864 } 865 } 866 867 exit(0); 868} 869 870int 871wait_for_reply(sock, mhdr) 872 int sock; 873 struct msghdr *mhdr; 874{ 875#ifdef HAVE_POLL 876 struct pollfd pfd[1]; 877 int cc = 0; 878 879 pfd[0].fd = sock; 880 pfd[0].events = POLLIN; 881 pfd[0].revents = 0; 882 883 if (poll(pfd, 1, waittime * 1000) > 0) 884 cc = recvmsg(rcvsock, mhdr, 0); 885 886 return(cc); 887#else 888 fd_set *fdsp; 889 struct timeval wait; 890 int cc = 0, fdsn; 891 892 fdsn = howmany(sock+1, NFDBITS) * sizeof(fd_mask); 893 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 894 err(1, "malloc"); 895 memset(fdsp, 0, fdsn); 896 FD_SET(sock, fdsp); 897 wait.tv_sec = waittime; wait.tv_usec = 0; 898 899 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 900 cc = recvmsg(rcvsock, mhdr, 0); 901 902 free(fdsp); 903 return(cc); 904#endif 905} 906 907#ifdef IPSEC 908#ifdef IPSEC_POLICY_IPSEC 909int 910setpolicy(so, policy) 911 int so; 912 char *policy; 913{ 914 char *buf; 915 916 buf = ipsec_set_policy(policy, strlen(policy)); 917 if (buf == NULL) { 918 warnx("%s", ipsec_strerror()); 919 return -1; 920 } 921 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 922 buf, ipsec_get_policylen(buf)); 923 924 free(buf); 925 926 return 0; 927} 928#endif 929#endif 930 931void 932send_probe(seq, hops) 933 int seq, hops; 934{ 935 struct opacket *op = outpacket; 936 int i; 937 938 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 939 (char *)&hops, sizeof(hops)) < 0) { 940 perror("setsockopt IPV6_UNICAST_HOPS"); 941 } 942 943 Dst.sin6_port = htons(port + seq); 944 945 op->seq = seq; 946 op->hops = hops; 947 (void) gettimeofday(&op->tv, &tz); 948 949 i = sendto(sndsock, (char *)outpacket, datalen , 0, 950 (struct sockaddr *)&Dst, Dst.sin6_len); 951 if (i < 0 || i != datalen) { 952 if (i<0) 953 perror("sendto"); 954 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 955 datalen, i); 956 (void) fflush(stdout); 957 } 958} 959 960int 961get_hoplim(mhdr) 962 struct msghdr *mhdr; 963{ 964 struct cmsghdr *cm; 965 966 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 967 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 968 if (cm->cmsg_level == IPPROTO_IPV6 && 969 cm->cmsg_type == IPV6_HOPLIMIT && 970 cm->cmsg_len == CMSG_LEN(sizeof(int))) 971 return(*(int *)CMSG_DATA(cm)); 972 } 973 974 return(-1); 975} 976 977double 978deltaT(t1p, t2p) 979 struct timeval *t1p, *t2p; 980{ 981 register double dt; 982 983 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 984 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 985 return (dt); 986} 987 988 989/* 990 * Convert an ICMP "type" field to a printable string. 991 */ 992char * 993pr_type(t0) 994 int t0; 995{ 996 u_char t = t0 & 0xff; 997 char *cp; 998 999 switch (t) { 1000 case ICMP6_DST_UNREACH: 1001 cp = "Destination Unreachable"; 1002 break; 1003 case ICMP6_PACKET_TOO_BIG: 1004 cp = "Pakcet Too Big"; 1005 break; 1006 case ICMP6_TIME_EXCEEDED: 1007 cp = "Time Exceeded"; 1008 break; 1009 case ICMP6_PARAM_PROB: 1010 cp = "Parameter Problem"; 1011 break; 1012 case ICMP6_ECHO_REQUEST: 1013 cp = "Echo Request"; 1014 break; 1015 case ICMP6_ECHO_REPLY: 1016 cp = "Echo Reply"; 1017 break; 1018 case ICMP6_MEMBERSHIP_QUERY: 1019 cp = "Group Membership Query"; 1020 break; 1021 case ICMP6_MEMBERSHIP_REPORT: 1022 cp = "Group Membership Report"; 1023 break; 1024 case ICMP6_MEMBERSHIP_REDUCTION: 1025 cp = "Group Membership Reduction"; 1026 break; 1027 case ND_ROUTER_SOLICIT: 1028 cp = "Router Solicitation"; 1029 break; 1030 case ND_ROUTER_ADVERT: 1031 cp = "Router Advertisement"; 1032 break; 1033 case ND_NEIGHBOR_SOLICIT: 1034 cp = "Neighbor Solicitation"; 1035 break; 1036 case ND_NEIGHBOR_ADVERT: 1037 cp = "Neighbor Advertisement"; 1038 break; 1039 case ND_REDIRECT: 1040 cp = "Redirect"; 1041 break; 1042 default: 1043 cp = "Unknown"; 1044 break; 1045 } 1046 return cp; 1047} 1048 1049 1050int 1051packet_ok(mhdr, cc, seq) 1052 struct msghdr *mhdr; 1053 int cc; 1054 int seq; 1055{ 1056 register struct icmp6_hdr *icp; 1057 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1058 u_char type, code; 1059 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1060 struct cmsghdr *cm; 1061 int *hlimp; 1062 char hbuf[NI_MAXHOST]; 1063 1064#ifdef OLDRAWSOCKET 1065 int hlen; 1066 struct ip6_hdr *ip; 1067#endif 1068 1069#ifdef OLDRAWSOCKET 1070 ip = (struct ip6_hdr *) buf; 1071 hlen = sizeof(struct ip6_hdr); 1072 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1073 if (verbose) { 1074 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1075 hbuf, sizeof(hbuf), NULL, 0, 1076 NI_NUMERICHOST | niflag) != 0) 1077 strcpy(hbuf, "invalid"); 1078 Printf("packet too short (%d bytes) from %s\n", cc, 1079 hbuf); 1080 } 1081 return (0); 1082 } 1083 cc -= hlen; 1084 icp = (struct icmp6_hdr *)(buf + hlen); 1085#else 1086 if (cc < sizeof(struct icmp6_hdr)) { 1087 if (verbose) { 1088 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1089 hbuf, sizeof(hbuf), NULL, 0, 1090 NI_NUMERICHOST | niflag) != 0) 1091 strcpy(hbuf, "invalid"); 1092 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1093 } 1094 return(0); 1095 } 1096 icp = (struct icmp6_hdr *)buf; 1097#endif 1098 /* get optional information via advanced API */ 1099 rcvpktinfo = NULL; 1100 hlimp = NULL; 1101 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1102 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1103 if (cm->cmsg_level == IPPROTO_IPV6 && 1104 cm->cmsg_type == IPV6_PKTINFO && 1105 cm->cmsg_len == 1106 CMSG_LEN(sizeof(struct in6_pktinfo))) 1107 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1108 1109 if (cm->cmsg_level == IPPROTO_IPV6 && 1110 cm->cmsg_type == IPV6_HOPLIMIT && 1111 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1112 hlimp = (int *)CMSG_DATA(cm); 1113 } 1114 if (rcvpktinfo == NULL || hlimp == NULL) { 1115 warnx("failed to get received hop limit or packet info"); 1116#if 0 1117 return(0); 1118#else 1119 rcvhlim = 0; /*XXX*/ 1120#endif 1121 } 1122 else 1123 rcvhlim = *hlimp; 1124 1125 type = icp->icmp6_type; 1126 code = icp->icmp6_code; 1127 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1128 || type == ICMP6_DST_UNREACH) { 1129 struct ip6_hdr *hip; 1130 struct udphdr *up; 1131 1132 hip = (struct ip6_hdr *)(icp + 1); 1133 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1134 if (verbose) 1135 warnx("failed to get upper layer header"); 1136 return(0); 1137 } 1138 if (up->uh_sport == htons(ident) && 1139 up->uh_dport == htons(port+seq)) 1140 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1141 } 1142 if (verbose) { 1143 int i; 1144 u_int8_t *p; 1145 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1146 1147 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1148 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1149 strcpy(sbuf, "invalid"); 1150 Printf("\n%d bytes from %s to %s", cc, sbuf, 1151 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1152 dbuf, sizeof(dbuf)) 1153 : "?"); 1154 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1155 icp->icmp6_code); 1156 p = (u_int8_t *)(icp + 1); 1157#define WIDTH 16 1158 for (i = 0; i < cc; i++) { 1159 if (i % WIDTH == 0) 1160 Printf("%04x:", i); 1161 if (i % 4 == 0) 1162 Printf(" "); 1163 Printf("%02x", p[i]); 1164 if (i % WIDTH == WIDTH - 1) 1165 Printf("\n"); 1166 } 1167 if (cc % WIDTH != 0) 1168 Printf("\n"); 1169 } 1170 return(0); 1171} 1172 1173/* 1174 * Increment pointer until find the UDP header. 1175 */ 1176struct udphdr * 1177get_udphdr(ip6, lim) 1178 struct ip6_hdr *ip6; 1179 u_char *lim; 1180{ 1181 u_char *cp = (u_char *)ip6, nh; 1182 int hlen; 1183 1184 if (cp + sizeof(*ip6) >= lim) 1185 return(NULL); 1186 1187 nh = ip6->ip6_nxt; 1188 cp += sizeof(struct ip6_hdr); 1189 1190 while(lim - cp >= 8) { 1191 switch(nh) { 1192 case IPPROTO_ESP: 1193 case IPPROTO_TCP: 1194 case IPPROTO_ICMPV6: 1195 return(NULL); 1196 case IPPROTO_UDP: 1197 return((struct udphdr *)cp); 1198 case IPPROTO_FRAGMENT: 1199 hlen = sizeof(struct ip6_frag); 1200 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1201 break; 1202 case IPPROTO_AH: 1203 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1204 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1205 break; 1206 default: 1207 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1208 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1209 break; 1210 } 1211 1212 cp += hlen; 1213 } 1214 1215 return(NULL); 1216} 1217 1218void 1219print(mhdr, cc) 1220 struct msghdr *mhdr; 1221 int cc; 1222{ 1223 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1224 char hbuf[NI_MAXHOST]; 1225 1226 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1227 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1228 strcpy(hbuf, "invalid"); 1229 if (nflag) 1230 Printf(" %s", hbuf); 1231 else if (lflag) 1232 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1233 else 1234 Printf(" %s", inetname((struct sockaddr *)from)); 1235 1236 if (verbose) { 1237#ifdef OLDRAWSOCKET 1238 Printf(" %d bytes to %s", cc, 1239 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1240 hbuf, sizeof(hbuf)) 1241 : "?"); 1242#else 1243 Printf(" %d bytes of data to %s", cc, 1244 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1245 hbuf, sizeof(hbuf)) 1246 : "?"); 1247#endif 1248 } 1249} 1250 1251/* 1252 * Subtract 2 timeval structs: out = out - in. 1253 * Out is assumed to be >= in. 1254 */ 1255void 1256tvsub(out, in) 1257 register struct timeval *out, *in; 1258{ 1259 if ((out->tv_usec -= in->tv_usec) < 0) { 1260 out->tv_sec--; 1261 out->tv_usec += 1000000; 1262 } 1263 out->tv_sec -= in->tv_sec; 1264} 1265 1266 1267/* 1268 * Construct an Internet address representation. 1269 * If the nflag has been supplied, give 1270 * numeric value, otherwise try for symbolic name. 1271 */ 1272const char * 1273inetname(sa) 1274 struct sockaddr *sa; 1275{ 1276 register char *cp; 1277 static char line[NI_MAXHOST]; 1278 static char domain[MAXHOSTNAMELEN + 1]; 1279 static int first = 1; 1280 1281 if (first && !nflag) { 1282 first = 0; 1283 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1284 (cp = index(domain, '.'))) 1285 (void) strcpy(domain, cp + 1); 1286 else 1287 domain[0] = 0; 1288 } 1289 cp = NULL; 1290 if (!nflag) { 1291 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1292 NI_NAMEREQD) == 0) { 1293 if ((cp = index(line, '.')) && 1294 !strcmp(cp + 1, domain)) 1295 *cp = 0; 1296 cp = line; 1297 } 1298 } 1299 if (cp) 1300 return cp; 1301 1302 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1303 NI_NUMERICHOST | niflag) != 0) 1304 strcpy(line, "invalid"); 1305 return line; 1306} 1307 1308void 1309usage() 1310{ 1311 (void)fprintf(stderr, 1312"usage: traceroute6 [-dlnrv] [-f first_hop] [-m max_hops] [-p port#] \n" 1313" [-q nqueries] [-s src_addr] [-g gateway] [-w wait] host [data size]\n"); 1314 exit(1); 1315} 1316