traceroute6.c revision 121316
1/* $KAME: traceroute6.c,v 1.42 2001/05/08 04:36:41 itojun Exp $ */ 2 3/* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32/*- 33 * Copyright (c) 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Van Jacobson. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 68#ifndef lint 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 121316 2003-10-21 20:11:47Z ume $"; 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 an 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 371int 372main(argc, argv) 373 int argc; 374 char *argv[]; 375{ 376 struct hostent *hp; 377 int error; 378 struct addrinfo hints, *res; 379 int ch, i, on, probe, seq, hops, rcvcmsglen; 380 static u_char *rcvcmsgbuf; 381 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 382 char *ep; 383 384 /* 385 * Receive ICMP 386 */ 387 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 388 perror("socket(ICMPv6)"); 389 exit(5); 390 } 391 392 /* revoke privs */ 393 seteuid(getuid()); 394 setuid(getuid()); 395 396 /* set a minimum set of socket options */ 397 on = 1; 398 /* specify to tell receiving interface */ 399#ifdef IPV6_RECVPKTINFO 400 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 401 sizeof(on)) < 0) 402 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 403#else /* old adv. API */ 404 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 405 sizeof(on)) < 0) 406 err(1, "setsockopt(IPV6_PKTINFO)"); 407#endif 408 409 /* specify to tell value of hoplimit field of received IP6 hdr */ 410#ifdef IPV6_RECVHOPLIMIT 411 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 412 sizeof(on)) < 0) 413 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 414#else /* old adv. API */ 415 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 416 sizeof(on)) < 0) 417 err(1, "setsockopt(IPV6_HOPLIMIT)"); 418#endif 419 420 seq = 0; 421 422 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 423 switch(ch) { 424 case 'd': 425 options |= SO_DEBUG; 426 break; 427 case 'f': 428 ep = NULL; 429 first_hop = strtoul(optarg, &ep, 0); 430 if (!*argv || *ep) { 431 Fprintf(stderr, 432 "traceroute6: invalid min hoplimit.\n"); 433 exit(1); 434 } 435 if (first_hop > max_hops) { 436 Fprintf(stderr, 437 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 438 exit(1); 439 } 440 break; 441 case 'g': 442 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 443 if (hp == NULL) { 444 Fprintf(stderr, 445 "traceroute6: unknown host %s\n", optarg); 446 exit(1); 447 } 448#ifdef USE_RFC2292BIS 449 if (rth == NULL) { 450 /* 451 * XXX: We can't detect the number of 452 * intermediate nodes yet. 453 */ 454 if ((rth = inet6_rth_init((void *)rtbuf, 455 sizeof(rtbuf), 456 IPV6_RTHDR_TYPE_0, 457 0)) == NULL) { 458 Fprintf(stderr, 459 "inet6_rth_init failed.\n"); 460 exit(1); 461 } 462 } 463 if (inet6_rth_add((void *)rth, 464 (struct in6_addr *)hp->h_addr)) { 465 Fprintf(stderr, 466 "inet6_rth_add failed for %s\n", 467 optarg); 468 exit(1); 469 } 470#else /* old advanced API */ 471 if (cmsg == NULL) 472 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 473 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 474#endif 475 freehostent(hp); 476 break; 477 case 'l': 478 lflag++; 479 break; 480 case 'm': 481 ep = NULL; 482 max_hops = strtoul(optarg, &ep, 0); 483 if (!*argv || *ep) { 484 Fprintf(stderr, 485 "traceroute6: invalid max hoplimit.\n"); 486 exit(1); 487 } 488 if (max_hops < first_hop) { 489 Fprintf(stderr, 490 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 491 exit(1); 492 } 493 break; 494 case 'n': 495 nflag++; 496 break; 497 case 'p': 498 ep = NULL; 499 port = strtoul(optarg, &ep, 0); 500 if (!*argv || *ep) { 501 Fprintf(stderr, 502 "traceroute6: port.\n"); 503 exit(1); 504 } 505 if (port < 1) { 506 Fprintf(stderr, 507 "traceroute6: port must be >0.\n"); 508 exit(1); 509 } 510 break; 511 case 'q': 512 ep = NULL; 513 nprobes = strtoul(optarg, &ep, 0); 514 if (!*argv || *ep) { 515 Fprintf(stderr, 516 "traceroute6: invalid nprobes.\n"); 517 exit(1); 518 } 519 if (nprobes < 1) { 520 Fprintf(stderr, 521 "traceroute6: nprobes must be >0.\n"); 522 exit(1); 523 } 524 break; 525 case 'r': 526 options |= SO_DONTROUTE; 527 break; 528 case 's': 529 /* 530 * set the ip source address of the outbound 531 * probe (e.g., on a multi-homed host). 532 */ 533 source = optarg; 534 break; 535 case 'v': 536 verbose++; 537 break; 538 case 'w': 539 ep = NULL; 540 waittime = strtoul(optarg, &ep, 0); 541 if (!*argv || *ep) { 542 Fprintf(stderr, 543 "traceroute6: invalid wait time.\n"); 544 exit(1); 545 } 546 if (waittime <= 1) { 547 Fprintf(stderr, 548 "traceroute6: wait must be >1 sec.\n"); 549 exit(1); 550 } 551 break; 552 default: 553 usage(); 554 } 555 argc -= optind; 556 argv += optind; 557 558 if (argc < 1 || argc > 2) 559 usage(); 560 561#if 1 562 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 563#else 564 setlinebuf (stdout); 565#endif 566 567 memset(&hints, 0, sizeof(hints)); 568 hints.ai_family = PF_INET6; 569 hints.ai_socktype = SOCK_RAW; 570 hints.ai_protocol = IPPROTO_ICMPV6; 571 hints.ai_flags = AI_CANONNAME; 572 error = getaddrinfo(*argv, NULL, &hints, &res); 573 if (error) { 574 (void)fprintf(stderr, 575 "traceroute6: %s\n", gai_strerror(error)); 576 exit(1); 577 } 578 if (res->ai_addrlen != sizeof(Dst)) { 579 (void)fprintf(stderr, 580 "traceroute6: size of sockaddr mismatch\n"); 581 exit(1); 582 } 583 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 584 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 585 if (!hostname) { 586 (void)fprintf(stderr, "traceroute6: not enough core\n"); 587 exit(1); 588 } 589 590 if (*++argv) { 591 ep = NULL; 592 datalen = strtoul(*argv, &ep, 0); 593 if (!*argv || *ep) { 594 Fprintf(stderr, 595 "traceroute6: invalid packet length.\n"); 596 exit(1); 597 } 598 } 599 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 600 Fprintf(stderr, 601 "traceroute6: packet size must be 0 <= s < %ld.\n", 602 (long)(MAXPACKET - sizeof(struct opacket))); 603 exit(1); 604 } 605 datalen += sizeof(struct opacket); 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 IPSEC 636#ifdef IPSEC_POLICY_IPSEC 637 /* 638 * do not raise error even if setsockopt fails, kernel may have ipsec 639 * turned off. 640 */ 641 if (setpolicy(rcvsock, "in bypass") < 0) 642 errx(1, "%s", ipsec_strerror()); 643 if (setpolicy(rcvsock, "out bypass") < 0) 644 errx(1, "%s", ipsec_strerror()); 645#else 646 { 647 int level = IPSEC_LEVEL_NONE; 648 649 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 650 sizeof(level)); 651 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 652 sizeof(level)); 653#ifdef IP_AUTH_TRANS_LEVEL 654 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 655 sizeof(level)); 656#else 657 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 658 sizeof(level)); 659#endif 660#ifdef IP_AUTH_NETWORK_LEVEL 661 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 662 sizeof(level)); 663#endif 664 } 665#endif /*IPSEC_POLICY_IPSEC*/ 666#endif /*IPSEC*/ 667 668 /* 669 * Send UDP 670 */ 671 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 672 perror("socket(SOCK_DGRAM)"); 673 exit(5); 674 } 675#ifdef SO_SNDBUF 676 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 677 sizeof(datalen)) < 0) { 678 perror("setsockopt(SO_SNDBUF)"); 679 exit(6); 680 } 681#endif /* SO_SNDBUF */ 682 if (options & SO_DEBUG) 683 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 684 (char *)&on, sizeof(on)); 685 if (options & SO_DONTROUTE) 686 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 687 (char *)&on, sizeof(on)); 688#ifdef USE_RFC2292BIS 689 if (rth) {/* XXX: there is no library to finalize the header... */ 690 rth->ip6r_len = rth->ip6r_segleft * 2; 691 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 692 (void *)rth, (rth->ip6r_len + 1) << 3)) { 693 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 694 strerror(errno)); 695 exit(1); 696 } 697 } 698#else /* old advanced API */ 699 if (cmsg != NULL) { 700 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 701 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 702 rtbuf, cmsg->cmsg_len) < 0) { 703 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 704 strerror(errno)); 705 exit(1); 706 } 707 } 708#endif /* USE_RFC2292BIS */ 709#ifdef IPSEC 710#ifdef IPSEC_POLICY_IPSEC 711 /* 712 * do not raise error even if setsockopt fails, kernel may have ipsec 713 * turned off. 714 */ 715 if (setpolicy(sndsock, "in bypass") < 0) 716 errx(1, "%s", ipsec_strerror()); 717 if (setpolicy(sndsock, "out bypass") < 0) 718 errx(1, "%s", ipsec_strerror()); 719#else 720 { 721 int level = IPSEC_LEVEL_BYPASS; 722 723 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 724 sizeof(level)); 725 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 726 sizeof(level)); 727#ifdef IP_AUTH_TRANS_LEVEL 728 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 729 sizeof(level)); 730#else 731 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 732 sizeof(level)); 733#endif 734#ifdef IP_AUTH_NETWORK_LEVEL 735 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 736 sizeof(level)); 737#endif 738 } 739#endif /*IPSEC_POLICY_IPSEC*/ 740#endif /*IPSEC*/ 741 742 /* 743 * Source selection 744 */ 745 bzero(&Src, sizeof(Src)); 746 if (source) { 747 struct addrinfo hints, *res; 748 int error; 749 750 memset(&hints, 0, sizeof(hints)); 751 hints.ai_family = AF_INET6; 752 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 753 hints.ai_flags = AI_NUMERICHOST; 754 error = getaddrinfo(source, "0", &hints, &res); 755 if (error) { 756 Printf("traceroute6: %s: %s\n", source, 757 gai_strerror(error)); 758 exit(1); 759 } 760 if (res->ai_addrlen > sizeof(Src)) { 761 Printf("traceroute6: %s: %s\n", source, 762 gai_strerror(error)); 763 exit(1); 764 } 765 memcpy(&Src, res->ai_addr, res->ai_addrlen); 766 freeaddrinfo(res); 767 } else { 768 struct sockaddr_in6 Nxt; 769 int dummy, len; 770 771 Nxt = Dst; 772 Nxt.sin6_port = htons(DUMMY_PORT); 773 if (cmsg != NULL) 774 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 775 sizeof(Nxt.sin6_addr)); 776 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 777 perror("socket"); 778 exit(1); 779 } 780 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 781 perror("connect"); 782 exit(1); 783 } 784 len = sizeof(Src); 785 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 786 perror("getsockname"); 787 exit(1); 788 } 789 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 790 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 791 Fprintf(stderr, "getnameinfo failed for source\n"); 792 exit(1); 793 } 794 source = src0; 795 close(dummy); 796 } 797 798#if 1 799 ident = (getpid() & 0xffff) | 0x8000; 800#else 801 ident = 0; /*let the kernel pick one*/ 802#endif 803 Src.sin6_port = htons(ident); 804 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 805 perror("bind"); 806 exit(1); 807 } 808 809 if (ident == 0) { 810 int len; 811 812 len = sizeof(Src); 813 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 814 perror("getsockname"); 815 exit(1); 816 } 817 ident = ntohs(Src.sin6_port); 818 } 819 820 /* 821 * Message to users 822 */ 823 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 824 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 825 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 826 Fprintf(stderr, "traceroute6"); 827 Fprintf(stderr, " to %s (%s)", hostname, hbuf); 828 if (source) 829 Fprintf(stderr, " from %s", source); 830 Fprintf(stderr, 831 ", %d hops max, %d byte packets\n", 832 max_hops, datalen); 833 (void) fflush(stderr); 834 835 if (first_hop > 1) 836 Printf("Skipping %d intermediate hops\n", first_hop - 1); 837 838 /* 839 * Main loop 840 */ 841 for (hops = first_hop; hops <= max_hops; ++hops) { 842 struct in6_addr lastaddr; 843 int got_there = 0; 844 int unreachable = 0; 845 846 Printf("%2d ", hops); 847 bzero(&lastaddr, sizeof(lastaddr)); 848 for (probe = 0; probe < nprobes; ++probe) { 849 int cc; 850 struct timeval t1, t2; 851 struct timezone tz; 852 853 (void) gettimeofday(&t1, &tz); 854 send_probe(++seq, hops); 855 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 856 (void) gettimeofday(&t2, &tz); 857 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 858 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 859 &lastaddr)) { 860 print(&rcvmhdr, cc); 861 lastaddr = Rcv.sin6_addr; 862 } 863 Printf(" %.3f ms", deltaT(&t1, &t2)); 864 switch(i - 1) { 865 case ICMP6_DST_UNREACH_NOROUTE: 866 ++unreachable; 867 Printf(" !N"); 868 break; 869 case ICMP6_DST_UNREACH_ADMIN: 870 ++unreachable; 871 Printf(" !P"); 872 break; 873 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 874 ++unreachable; 875 Printf(" !S"); 876 break; 877 case ICMP6_DST_UNREACH_ADDR: 878 ++unreachable; 879 Printf(" !A"); 880 break; 881 case ICMP6_DST_UNREACH_NOPORT: 882 if (rcvhlim >= 0 && 883 rcvhlim <= 1) 884 Printf(" !"); 885 ++got_there; 886 break; 887 } 888 break; 889 } 890 } 891 if (cc == 0) 892 Printf(" *"); 893 (void) fflush(stdout); 894 } 895 putchar('\n'); 896 if (got_there || 897 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 898 exit(0); 899 } 900 } 901 902 exit(0); 903} 904 905int 906wait_for_reply(sock, mhdr) 907 int sock; 908 struct msghdr *mhdr; 909{ 910#ifdef HAVE_POLL 911 struct pollfd pfd[1]; 912 int cc = 0; 913 914 pfd[0].fd = sock; 915 pfd[0].events = POLLIN; 916 pfd[0].revents = 0; 917 918 if (poll(pfd, 1, waittime * 1000) > 0) 919 cc = recvmsg(rcvsock, mhdr, 0); 920 921 return(cc); 922#else 923 fd_set *fdsp; 924 struct timeval wait; 925 int cc = 0, fdsn; 926 927 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 928 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 929 err(1, "malloc"); 930 memset(fdsp, 0, fdsn); 931 FD_SET(sock, fdsp); 932 wait.tv_sec = waittime; wait.tv_usec = 0; 933 934 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 935 cc = recvmsg(rcvsock, mhdr, 0); 936 937 free(fdsp); 938 return(cc); 939#endif 940} 941 942#ifdef IPSEC 943#ifdef IPSEC_POLICY_IPSEC 944int 945setpolicy(so, policy) 946 int so; 947 char *policy; 948{ 949 char *buf; 950 951 buf = ipsec_set_policy(policy, strlen(policy)); 952 if (buf == NULL) { 953 warnx("%s", ipsec_strerror()); 954 return -1; 955 } 956 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 957 buf, ipsec_get_policylen(buf)); 958 959 free(buf); 960 961 return 0; 962} 963#endif 964#endif 965 966void 967send_probe(seq, hops) 968 int seq, hops; 969{ 970 struct opacket *op = outpacket; 971 int i; 972 973 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 974 (char *)&hops, sizeof(hops)) < 0) { 975 perror("setsockopt IPV6_UNICAST_HOPS"); 976 } 977 978 Dst.sin6_port = htons(port + seq); 979 980 op->seq = seq; 981 op->hops = hops; 982 (void) gettimeofday(&op->tv, &tz); 983 984 i = sendto(sndsock, (char *)outpacket, datalen , 0, 985 (struct sockaddr *)&Dst, Dst.sin6_len); 986 if (i < 0 || i != datalen) { 987 if (i<0) 988 perror("sendto"); 989 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 990 datalen, i); 991 (void) fflush(stdout); 992 } 993} 994 995int 996get_hoplim(mhdr) 997 struct msghdr *mhdr; 998{ 999 struct cmsghdr *cm; 1000 1001 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1002 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1003 if (cm->cmsg_level == IPPROTO_IPV6 && 1004 cm->cmsg_type == IPV6_HOPLIMIT && 1005 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1006 return(*(int *)CMSG_DATA(cm)); 1007 } 1008 1009 return(-1); 1010} 1011 1012double 1013deltaT(t1p, t2p) 1014 struct timeval *t1p, *t2p; 1015{ 1016 register double dt; 1017 1018 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1019 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1020 return (dt); 1021} 1022 1023 1024/* 1025 * Convert an ICMP "type" field to a printable string. 1026 */ 1027char * 1028pr_type(t0) 1029 int t0; 1030{ 1031 u_char t = t0 & 0xff; 1032 char *cp; 1033 1034 switch (t) { 1035 case ICMP6_DST_UNREACH: 1036 cp = "Destination Unreachable"; 1037 break; 1038 case ICMP6_PACKET_TOO_BIG: 1039 cp = "Pakcet Too Big"; 1040 break; 1041 case ICMP6_TIME_EXCEEDED: 1042 cp = "Time Exceeded"; 1043 break; 1044 case ICMP6_PARAM_PROB: 1045 cp = "Parameter Problem"; 1046 break; 1047 case ICMP6_ECHO_REQUEST: 1048 cp = "Echo Request"; 1049 break; 1050 case ICMP6_ECHO_REPLY: 1051 cp = "Echo Reply"; 1052 break; 1053 case ICMP6_MEMBERSHIP_QUERY: 1054 cp = "Group Membership Query"; 1055 break; 1056 case ICMP6_MEMBERSHIP_REPORT: 1057 cp = "Group Membership Report"; 1058 break; 1059 case ICMP6_MEMBERSHIP_REDUCTION: 1060 cp = "Group Membership Reduction"; 1061 break; 1062 case ND_ROUTER_SOLICIT: 1063 cp = "Router Solicitation"; 1064 break; 1065 case ND_ROUTER_ADVERT: 1066 cp = "Router Advertisement"; 1067 break; 1068 case ND_NEIGHBOR_SOLICIT: 1069 cp = "Neighbor Solicitation"; 1070 break; 1071 case ND_NEIGHBOR_ADVERT: 1072 cp = "Neighbor Advertisement"; 1073 break; 1074 case ND_REDIRECT: 1075 cp = "Redirect"; 1076 break; 1077 default: 1078 cp = "Unknown"; 1079 break; 1080 } 1081 return cp; 1082} 1083 1084 1085int 1086packet_ok(mhdr, cc, seq) 1087 struct msghdr *mhdr; 1088 int cc; 1089 int seq; 1090{ 1091 register struct icmp6_hdr *icp; 1092 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1093 u_char type, code; 1094 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1095 struct cmsghdr *cm; 1096 int *hlimp; 1097 char hbuf[NI_MAXHOST]; 1098 1099#ifdef OLDRAWSOCKET 1100 int hlen; 1101 struct ip6_hdr *ip; 1102#endif 1103 1104#ifdef OLDRAWSOCKET 1105 ip = (struct ip6_hdr *) buf; 1106 hlen = sizeof(struct ip6_hdr); 1107 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1108 if (verbose) { 1109 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1110 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1111 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1112 Printf("packet too short (%d bytes) from %s\n", cc, 1113 hbuf); 1114 } 1115 return (0); 1116 } 1117 cc -= hlen; 1118 icp = (struct icmp6_hdr *)(buf + hlen); 1119#else 1120 if (cc < sizeof(struct icmp6_hdr)) { 1121 if (verbose) { 1122 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1123 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1124 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1125 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1126 } 1127 return(0); 1128 } 1129 icp = (struct icmp6_hdr *)buf; 1130#endif 1131 /* get optional information via advanced API */ 1132 rcvpktinfo = NULL; 1133 hlimp = NULL; 1134 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1135 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1136 if (cm->cmsg_level == IPPROTO_IPV6 && 1137 cm->cmsg_type == IPV6_PKTINFO && 1138 cm->cmsg_len == 1139 CMSG_LEN(sizeof(struct in6_pktinfo))) 1140 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1141 1142 if (cm->cmsg_level == IPPROTO_IPV6 && 1143 cm->cmsg_type == IPV6_HOPLIMIT && 1144 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1145 hlimp = (int *)CMSG_DATA(cm); 1146 } 1147 if (rcvpktinfo == NULL || hlimp == NULL) { 1148 warnx("failed to get received hop limit or packet info"); 1149#if 0 1150 return(0); 1151#else 1152 rcvhlim = 0; /*XXX*/ 1153#endif 1154 } 1155 else 1156 rcvhlim = *hlimp; 1157 1158 type = icp->icmp6_type; 1159 code = icp->icmp6_code; 1160 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1161 || type == ICMP6_DST_UNREACH) { 1162 struct ip6_hdr *hip; 1163 struct udphdr *up; 1164 1165 hip = (struct ip6_hdr *)(icp + 1); 1166 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1167 if (verbose) 1168 warnx("failed to get upper layer header"); 1169 return(0); 1170 } 1171 if (up->uh_sport == htons(ident) && 1172 up->uh_dport == htons(port+seq)) 1173 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1174 } 1175 if (verbose) { 1176 int i; 1177 u_int8_t *p; 1178 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1179 1180 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1181 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1182 strlcpy(sbuf, "invalid", sizeof(hbuf)); 1183 Printf("\n%d bytes from %s to %s", cc, sbuf, 1184 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1185 dbuf, sizeof(dbuf)) 1186 : "?"); 1187 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1188 icp->icmp6_code); 1189 p = (u_int8_t *)(icp + 1); 1190#define WIDTH 16 1191 for (i = 0; i < cc; i++) { 1192 if (i % WIDTH == 0) 1193 Printf("%04x:", i); 1194 if (i % 4 == 0) 1195 Printf(" "); 1196 Printf("%02x", p[i]); 1197 if (i % WIDTH == WIDTH - 1) 1198 Printf("\n"); 1199 } 1200 if (cc % WIDTH != 0) 1201 Printf("\n"); 1202 } 1203 return(0); 1204} 1205 1206/* 1207 * Increment pointer until find the UDP header. 1208 */ 1209struct udphdr * 1210get_udphdr(ip6, lim) 1211 struct ip6_hdr *ip6; 1212 u_char *lim; 1213{ 1214 u_char *cp = (u_char *)ip6, nh; 1215 int hlen; 1216 1217 if (cp + sizeof(*ip6) >= lim) 1218 return(NULL); 1219 1220 nh = ip6->ip6_nxt; 1221 cp += sizeof(struct ip6_hdr); 1222 1223 while(lim - cp >= 8) { 1224 switch(nh) { 1225 case IPPROTO_ESP: 1226 case IPPROTO_TCP: 1227 case IPPROTO_ICMPV6: 1228 return(NULL); 1229 case IPPROTO_UDP: 1230 return((struct udphdr *)cp); 1231 case IPPROTO_FRAGMENT: 1232 hlen = sizeof(struct ip6_frag); 1233 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1234 break; 1235 case IPPROTO_AH: 1236 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1237 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1238 break; 1239 default: 1240 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1241 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1242 break; 1243 } 1244 1245 cp += hlen; 1246 } 1247 1248 return(NULL); 1249} 1250 1251void 1252print(mhdr, cc) 1253 struct msghdr *mhdr; 1254 int cc; 1255{ 1256 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1257 char hbuf[NI_MAXHOST]; 1258 1259 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1260 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1261 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1262 if (nflag) 1263 Printf(" %s", hbuf); 1264 else if (lflag) 1265 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1266 else 1267 Printf(" %s", inetname((struct sockaddr *)from)); 1268 1269 if (verbose) { 1270#ifdef OLDRAWSOCKET 1271 Printf(" %d bytes to %s", cc, 1272 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1273 hbuf, sizeof(hbuf)) 1274 : "?"); 1275#else 1276 Printf(" %d bytes of data to %s", cc, 1277 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1278 hbuf, sizeof(hbuf)) 1279 : "?"); 1280#endif 1281 } 1282} 1283 1284/* 1285 * Subtract 2 timeval structs: out = out - in. 1286 * Out is assumed to be >= in. 1287 */ 1288void 1289tvsub(out, in) 1290 register struct timeval *out, *in; 1291{ 1292 if ((out->tv_usec -= in->tv_usec) < 0) { 1293 out->tv_sec--; 1294 out->tv_usec += 1000000; 1295 } 1296 out->tv_sec -= in->tv_sec; 1297} 1298 1299 1300/* 1301 * Construct an Internet address representation. 1302 * If the nflag has been supplied, give 1303 * numeric value, otherwise try for symbolic name. 1304 */ 1305const char * 1306inetname(sa) 1307 struct sockaddr *sa; 1308{ 1309 register char *cp; 1310 static char line[NI_MAXHOST]; 1311 static char domain[MAXHOSTNAMELEN + 1]; 1312 static int first = 1; 1313 1314 if (first && !nflag) { 1315 first = 0; 1316 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1317 (cp = index(domain, '.'))) 1318 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1319 else 1320 domain[0] = 0; 1321 } 1322 cp = NULL; 1323 if (!nflag) { 1324 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1325 NI_NAMEREQD) == 0) { 1326 if ((cp = index(line, '.')) && 1327 !strcmp(cp + 1, domain)) 1328 *cp = 0; 1329 cp = line; 1330 } 1331 } 1332 if (cp) 1333 return cp; 1334 1335 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1336 NI_NUMERICHOST) != 0) 1337 strlcpy(line, "invalid", sizeof(line)); 1338 return line; 1339} 1340 1341void 1342usage() 1343{ 1344 (void)fprintf(stderr, 1345"usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1346" [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1347 exit(1); 1348} 1349