traceroute6.c revision 103133
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 103133 2002-09-09 16:43:18Z nectar $"; 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 char *ep; 389 390 /* 391 * Receive ICMP 392 */ 393 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 394 perror("socket(ICMPv6)"); 395 exit(5); 396 } 397 398 /* revoke privs */ 399 seteuid(getuid()); 400 setuid(getuid()); 401 402 /* set a minimum set of socket options */ 403 on = 1; 404 /* specify to tell receiving interface */ 405#ifdef IPV6_RECVPKTINFO 406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 407 sizeof(on)) < 0) 408 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 409#else /* old adv. API */ 410 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 411 sizeof(on)) < 0) 412 err(1, "setsockopt(IPV6_PKTINFO)"); 413#endif 414 415 /* specify to tell value of hoplimit field of received IP6 hdr */ 416#ifdef IPV6_RECVHOPLIMIT 417 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 418 sizeof(on)) < 0) 419 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 420#else /* old adv. API */ 421 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 422 sizeof(on)) < 0) 423 err(1, "setsockopt(IPV6_HOPLIMIT)"); 424#endif 425 426 seq = 0; 427 428 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 429 switch(ch) { 430 case 'd': 431 options |= SO_DEBUG; 432 break; 433 case 'f': 434 ep = NULL; 435 first_hop = strtoul(optarg, &ep, 0); 436 if (!*argv || *ep) { 437 Fprintf(stderr, 438 "traceroute6: invalid min hoplimit.\n"); 439 exit(1); 440 } 441 if (first_hop > max_hops) { 442 Fprintf(stderr, 443 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 444 exit(1); 445 } 446 break; 447 case 'g': 448 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 449 if (hp == NULL) { 450 Fprintf(stderr, 451 "traceroute6: unknown host %s\n", optarg); 452 exit(1); 453 } 454#ifdef USE_RFC2292BIS 455 if (rth == NULL) { 456 /* 457 * XXX: We can't detect the number of 458 * intermediate nodes yet. 459 */ 460 if ((rth = inet6_rth_init((void *)rtbuf, 461 sizeof(rtbuf), 462 IPV6_RTHDR_TYPE_0, 463 0)) == NULL) { 464 Fprintf(stderr, 465 "inet6_rth_init failed.\n"); 466 exit(1); 467 } 468 } 469 if (inet6_rth_add((void *)rth, 470 (struct in6_addr *)hp->h_addr)) { 471 Fprintf(stderr, 472 "inet6_rth_add failed for %s\n", 473 optarg); 474 exit(1); 475 } 476#else /* old advanced API */ 477 if (cmsg == NULL) 478 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 479 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 480#endif 481 freehostent(hp); 482 break; 483 case 'l': 484 lflag++; 485 break; 486 case 'm': 487 ep = NULL; 488 max_hops = strtoul(optarg, &ep, 0); 489 if (!*argv || *ep) { 490 Fprintf(stderr, 491 "traceroute6: invalid max hoplimit.\n"); 492 exit(1); 493 } 494 if (max_hops < first_hop) { 495 Fprintf(stderr, 496 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 497 exit(1); 498 } 499 break; 500 case 'n': 501 nflag++; 502 break; 503 case 'p': 504 ep = NULL; 505 port = strtoul(optarg, &ep, 0); 506 if (!*argv || *ep) { 507 Fprintf(stderr, 508 "traceroute6: port.\n"); 509 exit(1); 510 } 511 if (port < 1) { 512 Fprintf(stderr, 513 "traceroute6: port must be >0.\n"); 514 exit(1); 515 } 516 break; 517 case 'q': 518 ep = NULL; 519 nprobes = strtoul(optarg, &ep, 0); 520 if (!*argv || *ep) { 521 Fprintf(stderr, 522 "traceroute6: invalid nprobes.\n"); 523 exit(1); 524 } 525 if (nprobes < 1) { 526 Fprintf(stderr, 527 "traceroute6: nprobes must be >0.\n"); 528 exit(1); 529 } 530 break; 531 case 'r': 532 options |= SO_DONTROUTE; 533 break; 534 case 's': 535 /* 536 * set the ip source address of the outbound 537 * probe (e.g., on a multi-homed host). 538 */ 539 source = optarg; 540 break; 541 case 'v': 542 verbose++; 543 break; 544 case 'w': 545 ep = NULL; 546 waittime = strtoul(optarg, &ep, 0); 547 if (!*argv || *ep) { 548 Fprintf(stderr, 549 "traceroute6: invalid wait time.\n"); 550 exit(1); 551 } 552 if (waittime <= 1) { 553 Fprintf(stderr, 554 "traceroute6: wait must be >1 sec.\n"); 555 exit(1); 556 } 557 break; 558 default: 559 usage(); 560 } 561 argc -= optind; 562 argv += optind; 563 564 if (argc < 1 || argc > 2) 565 usage(); 566 567#if 1 568 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 569#else 570 setlinebuf (stdout); 571#endif 572 573 memset(&hints, 0, sizeof(hints)); 574 hints.ai_family = PF_INET6; 575 hints.ai_socktype = SOCK_RAW; 576 hints.ai_protocol = IPPROTO_ICMPV6; 577 hints.ai_flags = AI_CANONNAME; 578 error = getaddrinfo(*argv, NULL, &hints, &res); 579 if (error) { 580 (void)fprintf(stderr, 581 "traceroute6: %s\n", gai_strerror(error)); 582 exit(1); 583 } 584 if (res->ai_addrlen != sizeof(Dst)) { 585 (void)fprintf(stderr, 586 "traceroute6: size of sockaddr mismatch\n"); 587 exit(1); 588 } 589 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 590 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 591 if (!hostname) { 592 (void)fprintf(stderr, "traceroute6: not enough core\n"); 593 exit(1); 594 } 595 596 if (*++argv) { 597 ep = NULL; 598 datalen = strtoul(*argv, &ep, 0); 599 if (!*argv || *ep) { 600 Fprintf(stderr, 601 "traceroute6: invalid packet length.\n"); 602 exit(1); 603 } 604 } 605 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 606 Fprintf(stderr, 607 "traceroute6: packet size must be 0 <= s < %ld.\n", 608 (long)(MAXPACKET - sizeof(struct opacket))); 609 exit(1); 610 } 611 datalen += sizeof(struct opacket); 612 outpacket = (struct opacket *)malloc((unsigned)datalen); 613 if (! outpacket) { 614 perror("malloc"); 615 exit(1); 616 } 617 (void) bzero((char *)outpacket, datalen); 618 619 /* initialize msghdr for receiving packets */ 620 rcviov[0].iov_base = (caddr_t)packet; 621 rcviov[0].iov_len = sizeof(packet); 622 rcvmhdr.msg_name = (caddr_t)&Rcv; 623 rcvmhdr.msg_namelen = sizeof(Rcv); 624 rcvmhdr.msg_iov = rcviov; 625 rcvmhdr.msg_iovlen = 1; 626 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 627 + CMSG_SPACE(sizeof(int)); 628 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 629 Fprintf(stderr, "traceroute6: malloc failed\n"); 630 exit(1); 631 } 632 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 633 rcvmhdr.msg_controllen = rcvcmsglen; 634 635 if (options & SO_DEBUG) 636 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 637 (char *)&on, sizeof(on)); 638 if (options & SO_DONTROUTE) 639 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 640 (char *)&on, sizeof(on)); 641#ifdef IPSEC 642#ifdef IPSEC_POLICY_IPSEC 643 /* 644 * do not raise error even if setsockopt fails, kernel may have ipsec 645 * turned off. 646 */ 647 if (setpolicy(rcvsock, "in bypass") < 0) 648 errx(1, "%s", ipsec_strerror()); 649 if (setpolicy(rcvsock, "out bypass") < 0) 650 errx(1, "%s", ipsec_strerror()); 651#else 652 { 653 int level = IPSEC_LEVEL_NONE; 654 655 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 656 sizeof(level)); 657 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 658 sizeof(level)); 659#ifdef IP_AUTH_TRANS_LEVEL 660 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 661 sizeof(level)); 662#else 663 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 664 sizeof(level)); 665#endif 666#ifdef IP_AUTH_NETWORK_LEVEL 667 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 668 sizeof(level)); 669#endif 670 } 671#endif /*IPSEC_POLICY_IPSEC*/ 672#endif /*IPSEC*/ 673 674 /* 675 * Send UDP 676 */ 677 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 678 perror("socket(SOCK_DGRAM)"); 679 exit(5); 680 } 681#ifdef SO_SNDBUF 682 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 683 sizeof(datalen)) < 0) { 684 perror("setsockopt(SO_SNDBUF)"); 685 exit(6); 686 } 687#endif /* SO_SNDBUF */ 688 if (options & SO_DEBUG) 689 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 690 (char *)&on, sizeof(on)); 691 if (options & SO_DONTROUTE) 692 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 693 (char *)&on, sizeof(on)); 694#ifdef USE_RFC2292BIS 695 if (rth) {/* XXX: there is no library to finalize the header... */ 696 rth->ip6r_len = rth->ip6r_segleft * 2; 697 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 698 (void *)rth, (rth->ip6r_len + 1) << 3)) { 699 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 700 strerror(errno)); 701 exit(1); 702 } 703 } 704#else /* old advanced API */ 705 if (cmsg != NULL) { 706 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 707 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 708 rtbuf, cmsg->cmsg_len) < 0) { 709 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 710 strerror(errno)); 711 exit(1); 712 } 713 } 714#endif /* USE_RFC2292BIS */ 715#ifdef IPSEC 716#ifdef IPSEC_POLICY_IPSEC 717 /* 718 * do not raise error even if setsockopt fails, kernel may have ipsec 719 * turned off. 720 */ 721 if (setpolicy(sndsock, "in bypass") < 0) 722 errx(1, "%s", ipsec_strerror()); 723 if (setpolicy(sndsock, "out bypass") < 0) 724 errx(1, "%s", ipsec_strerror()); 725#else 726 { 727 int level = IPSEC_LEVEL_BYPASS; 728 729 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 730 sizeof(level)); 731 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 732 sizeof(level)); 733#ifdef IP_AUTH_TRANS_LEVEL 734 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 735 sizeof(level)); 736#else 737 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 738 sizeof(level)); 739#endif 740#ifdef IP_AUTH_NETWORK_LEVEL 741 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 742 sizeof(level)); 743#endif 744 } 745#endif /*IPSEC_POLICY_IPSEC*/ 746#endif /*IPSEC*/ 747 748 /* 749 * Source selection 750 */ 751 bzero(&Src, sizeof(Src)); 752 if (source) { 753 struct addrinfo hints, *res; 754 int error; 755 756 memset(&hints, 0, sizeof(hints)); 757 hints.ai_family = AF_INET6; 758 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 759 hints.ai_flags = AI_NUMERICHOST; 760 error = getaddrinfo(source, "0", &hints, &res); 761 if (error) { 762 Printf("traceroute6: %s: %s\n", source, 763 gai_strerror(error)); 764 exit(1); 765 } 766 if (res->ai_addrlen > sizeof(Src)) { 767 Printf("traceroute6: %s: %s\n", source, 768 gai_strerror(error)); 769 exit(1); 770 } 771 memcpy(&Src, res->ai_addr, res->ai_addrlen); 772 freeaddrinfo(res); 773 } else { 774 struct sockaddr_in6 Nxt; 775 int dummy, len; 776 777 Nxt = Dst; 778 Nxt.sin6_port = htons(DUMMY_PORT); 779 if (cmsg != NULL) 780 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 781 sizeof(Nxt.sin6_addr)); 782 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 783 perror("socket"); 784 exit(1); 785 } 786 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 787 perror("connect"); 788 exit(1); 789 } 790 len = sizeof(Src); 791 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 792 perror("getsockname"); 793 exit(1); 794 } 795 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 796 src0, sizeof(src0), NULL, 0, 797 NI_NUMERICHOST | niflag)) { 798 Fprintf(stderr, "getnameinfo failed for source\n"); 799 exit(1); 800 } 801 source = src0; 802 close(dummy); 803 } 804 805#if 1 806 ident = (getpid() & 0xffff) | 0x8000; 807#else 808 ident = 0; /*let the kernel pick one*/ 809#endif 810 Src.sin6_port = htons(ident); 811 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 812 perror("bind"); 813 exit(1); 814 } 815 816 if (ident == 0) { 817 int len; 818 819 len = sizeof(Src); 820 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 821 perror("getsockname"); 822 exit(1); 823 } 824 ident = ntohs(Src.sin6_port); 825 } 826 827 /* 828 * Message to users 829 */ 830 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 831 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag)) 832 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 833 Fprintf(stderr, "traceroute6"); 834 Fprintf(stderr, " to %s (%s)", hostname, hbuf); 835 if (source) 836 Fprintf(stderr, " from %s", source); 837 Fprintf(stderr, 838 ", %d hops max, %d byte packets\n", 839 max_hops, datalen); 840 (void) fflush(stderr); 841 842 if (first_hop > 1) 843 Printf("Skipping %d intermediate hops\n", first_hop - 1); 844 845 /* 846 * Main loop 847 */ 848 for (hops = first_hop; hops <= max_hops; ++hops) { 849 struct in6_addr lastaddr; 850 int got_there = 0; 851 int unreachable = 0; 852 853 Printf("%2d ", hops); 854 bzero(&lastaddr, sizeof(lastaddr)); 855 for (probe = 0; probe < nprobes; ++probe) { 856 int cc; 857 struct timeval t1, t2; 858 struct timezone tz; 859 860 (void) gettimeofday(&t1, &tz); 861 send_probe(++seq, hops); 862 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 863 (void) gettimeofday(&t2, &tz); 864 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 865 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 866 &lastaddr)) { 867 print(&rcvmhdr, cc); 868 lastaddr = Rcv.sin6_addr; 869 } 870 Printf(" %g ms", deltaT(&t1, &t2)); 871 switch(i - 1) { 872 case ICMP6_DST_UNREACH_NOROUTE: 873 ++unreachable; 874 Printf(" !N"); 875 break; 876 case ICMP6_DST_UNREACH_ADMIN: 877 ++unreachable; 878 Printf(" !P"); 879 break; 880 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 881 ++unreachable; 882 Printf(" !S"); 883 break; 884 case ICMP6_DST_UNREACH_ADDR: 885 ++unreachable; 886 Printf(" !A"); 887 break; 888 case ICMP6_DST_UNREACH_NOPORT: 889 if (rcvhlim >= 0 && 890 rcvhlim <= 1) 891 Printf(" !"); 892 ++got_there; 893 break; 894 } 895 break; 896 } 897 } 898 if (cc == 0) 899 Printf(" *"); 900 (void) fflush(stdout); 901 } 902 putchar('\n'); 903 if (got_there || 904 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 905 exit(0); 906 } 907 } 908 909 exit(0); 910} 911 912int 913wait_for_reply(sock, mhdr) 914 int sock; 915 struct msghdr *mhdr; 916{ 917#ifdef HAVE_POLL 918 struct pollfd pfd[1]; 919 int cc = 0; 920 921 pfd[0].fd = sock; 922 pfd[0].events = POLLIN; 923 pfd[0].revents = 0; 924 925 if (poll(pfd, 1, waittime * 1000) > 0) 926 cc = recvmsg(rcvsock, mhdr, 0); 927 928 return(cc); 929#else 930 fd_set *fdsp; 931 struct timeval wait; 932 int cc = 0, fdsn; 933 934 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 935 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 936 err(1, "malloc"); 937 memset(fdsp, 0, fdsn); 938 FD_SET(sock, fdsp); 939 wait.tv_sec = waittime; wait.tv_usec = 0; 940 941 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 942 cc = recvmsg(rcvsock, mhdr, 0); 943 944 free(fdsp); 945 return(cc); 946#endif 947} 948 949#ifdef IPSEC 950#ifdef IPSEC_POLICY_IPSEC 951int 952setpolicy(so, policy) 953 int so; 954 char *policy; 955{ 956 char *buf; 957 958 buf = ipsec_set_policy(policy, strlen(policy)); 959 if (buf == NULL) { 960 warnx("%s", ipsec_strerror()); 961 return -1; 962 } 963 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 964 buf, ipsec_get_policylen(buf)); 965 966 free(buf); 967 968 return 0; 969} 970#endif 971#endif 972 973void 974send_probe(seq, hops) 975 int seq, hops; 976{ 977 struct opacket *op = outpacket; 978 int i; 979 980 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 981 (char *)&hops, sizeof(hops)) < 0) { 982 perror("setsockopt IPV6_UNICAST_HOPS"); 983 } 984 985 Dst.sin6_port = htons(port + seq); 986 987 op->seq = seq; 988 op->hops = hops; 989 (void) gettimeofday(&op->tv, &tz); 990 991 i = sendto(sndsock, (char *)outpacket, datalen , 0, 992 (struct sockaddr *)&Dst, Dst.sin6_len); 993 if (i < 0 || i != datalen) { 994 if (i<0) 995 perror("sendto"); 996 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 997 datalen, i); 998 (void) fflush(stdout); 999 } 1000} 1001 1002int 1003get_hoplim(mhdr) 1004 struct msghdr *mhdr; 1005{ 1006 struct cmsghdr *cm; 1007 1008 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1009 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1010 if (cm->cmsg_level == IPPROTO_IPV6 && 1011 cm->cmsg_type == IPV6_HOPLIMIT && 1012 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1013 return(*(int *)CMSG_DATA(cm)); 1014 } 1015 1016 return(-1); 1017} 1018 1019double 1020deltaT(t1p, t2p) 1021 struct timeval *t1p, *t2p; 1022{ 1023 register double dt; 1024 1025 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1026 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1027 return (dt); 1028} 1029 1030 1031/* 1032 * Convert an ICMP "type" field to a printable string. 1033 */ 1034char * 1035pr_type(t0) 1036 int t0; 1037{ 1038 u_char t = t0 & 0xff; 1039 char *cp; 1040 1041 switch (t) { 1042 case ICMP6_DST_UNREACH: 1043 cp = "Destination Unreachable"; 1044 break; 1045 case ICMP6_PACKET_TOO_BIG: 1046 cp = "Pakcet Too Big"; 1047 break; 1048 case ICMP6_TIME_EXCEEDED: 1049 cp = "Time Exceeded"; 1050 break; 1051 case ICMP6_PARAM_PROB: 1052 cp = "Parameter Problem"; 1053 break; 1054 case ICMP6_ECHO_REQUEST: 1055 cp = "Echo Request"; 1056 break; 1057 case ICMP6_ECHO_REPLY: 1058 cp = "Echo Reply"; 1059 break; 1060 case ICMP6_MEMBERSHIP_QUERY: 1061 cp = "Group Membership Query"; 1062 break; 1063 case ICMP6_MEMBERSHIP_REPORT: 1064 cp = "Group Membership Report"; 1065 break; 1066 case ICMP6_MEMBERSHIP_REDUCTION: 1067 cp = "Group Membership Reduction"; 1068 break; 1069 case ND_ROUTER_SOLICIT: 1070 cp = "Router Solicitation"; 1071 break; 1072 case ND_ROUTER_ADVERT: 1073 cp = "Router Advertisement"; 1074 break; 1075 case ND_NEIGHBOR_SOLICIT: 1076 cp = "Neighbor Solicitation"; 1077 break; 1078 case ND_NEIGHBOR_ADVERT: 1079 cp = "Neighbor Advertisement"; 1080 break; 1081 case ND_REDIRECT: 1082 cp = "Redirect"; 1083 break; 1084 default: 1085 cp = "Unknown"; 1086 break; 1087 } 1088 return cp; 1089} 1090 1091 1092int 1093packet_ok(mhdr, cc, seq) 1094 struct msghdr *mhdr; 1095 int cc; 1096 int seq; 1097{ 1098 register struct icmp6_hdr *icp; 1099 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1100 u_char type, code; 1101 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1102 struct cmsghdr *cm; 1103 int *hlimp; 1104 char hbuf[NI_MAXHOST]; 1105 1106#ifdef OLDRAWSOCKET 1107 int hlen; 1108 struct ip6_hdr *ip; 1109#endif 1110 1111#ifdef OLDRAWSOCKET 1112 ip = (struct ip6_hdr *) buf; 1113 hlen = sizeof(struct ip6_hdr); 1114 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1115 if (verbose) { 1116 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1117 hbuf, sizeof(hbuf), NULL, 0, 1118 NI_NUMERICHOST | niflag) != 0) 1119 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1120 Printf("packet too short (%d bytes) from %s\n", cc, 1121 hbuf); 1122 } 1123 return (0); 1124 } 1125 cc -= hlen; 1126 icp = (struct icmp6_hdr *)(buf + hlen); 1127#else 1128 if (cc < sizeof(struct icmp6_hdr)) { 1129 if (verbose) { 1130 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1131 hbuf, sizeof(hbuf), NULL, 0, 1132 NI_NUMERICHOST | niflag) != 0) 1133 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1134 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1135 } 1136 return(0); 1137 } 1138 icp = (struct icmp6_hdr *)buf; 1139#endif 1140 /* get optional information via advanced API */ 1141 rcvpktinfo = NULL; 1142 hlimp = NULL; 1143 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1144 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1145 if (cm->cmsg_level == IPPROTO_IPV6 && 1146 cm->cmsg_type == IPV6_PKTINFO && 1147 cm->cmsg_len == 1148 CMSG_LEN(sizeof(struct in6_pktinfo))) 1149 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1150 1151 if (cm->cmsg_level == IPPROTO_IPV6 && 1152 cm->cmsg_type == IPV6_HOPLIMIT && 1153 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1154 hlimp = (int *)CMSG_DATA(cm); 1155 } 1156 if (rcvpktinfo == NULL || hlimp == NULL) { 1157 warnx("failed to get received hop limit or packet info"); 1158#if 0 1159 return(0); 1160#else 1161 rcvhlim = 0; /*XXX*/ 1162#endif 1163 } 1164 else 1165 rcvhlim = *hlimp; 1166 1167 type = icp->icmp6_type; 1168 code = icp->icmp6_code; 1169 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1170 || type == ICMP6_DST_UNREACH) { 1171 struct ip6_hdr *hip; 1172 struct udphdr *up; 1173 1174 hip = (struct ip6_hdr *)(icp + 1); 1175 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1176 if (verbose) 1177 warnx("failed to get upper layer header"); 1178 return(0); 1179 } 1180 if (up->uh_sport == htons(ident) && 1181 up->uh_dport == htons(port+seq)) 1182 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1183 } 1184 if (verbose) { 1185 int i; 1186 u_int8_t *p; 1187 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1188 1189 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1190 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1191 strlcpy(sbuf, "invalid", sizeof(hbuf)); 1192 Printf("\n%d bytes from %s to %s", cc, sbuf, 1193 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1194 dbuf, sizeof(dbuf)) 1195 : "?"); 1196 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1197 icp->icmp6_code); 1198 p = (u_int8_t *)(icp + 1); 1199#define WIDTH 16 1200 for (i = 0; i < cc; i++) { 1201 if (i % WIDTH == 0) 1202 Printf("%04x:", i); 1203 if (i % 4 == 0) 1204 Printf(" "); 1205 Printf("%02x", p[i]); 1206 if (i % WIDTH == WIDTH - 1) 1207 Printf("\n"); 1208 } 1209 if (cc % WIDTH != 0) 1210 Printf("\n"); 1211 } 1212 return(0); 1213} 1214 1215/* 1216 * Increment pointer until find the UDP header. 1217 */ 1218struct udphdr * 1219get_udphdr(ip6, lim) 1220 struct ip6_hdr *ip6; 1221 u_char *lim; 1222{ 1223 u_char *cp = (u_char *)ip6, nh; 1224 int hlen; 1225 1226 if (cp + sizeof(*ip6) >= lim) 1227 return(NULL); 1228 1229 nh = ip6->ip6_nxt; 1230 cp += sizeof(struct ip6_hdr); 1231 1232 while(lim - cp >= 8) { 1233 switch(nh) { 1234 case IPPROTO_ESP: 1235 case IPPROTO_TCP: 1236 case IPPROTO_ICMPV6: 1237 return(NULL); 1238 case IPPROTO_UDP: 1239 return((struct udphdr *)cp); 1240 case IPPROTO_FRAGMENT: 1241 hlen = sizeof(struct ip6_frag); 1242 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1243 break; 1244 case IPPROTO_AH: 1245 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1246 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1247 break; 1248 default: 1249 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1250 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1251 break; 1252 } 1253 1254 cp += hlen; 1255 } 1256 1257 return(NULL); 1258} 1259 1260void 1261print(mhdr, cc) 1262 struct msghdr *mhdr; 1263 int cc; 1264{ 1265 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1266 char hbuf[NI_MAXHOST]; 1267 1268 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1269 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1270 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1271 if (nflag) 1272 Printf(" %s", hbuf); 1273 else if (lflag) 1274 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1275 else 1276 Printf(" %s", inetname((struct sockaddr *)from)); 1277 1278 if (verbose) { 1279#ifdef OLDRAWSOCKET 1280 Printf(" %d bytes to %s", cc, 1281 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1282 hbuf, sizeof(hbuf)) 1283 : "?"); 1284#else 1285 Printf(" %d bytes of data to %s", cc, 1286 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1287 hbuf, sizeof(hbuf)) 1288 : "?"); 1289#endif 1290 } 1291} 1292 1293/* 1294 * Subtract 2 timeval structs: out = out - in. 1295 * Out is assumed to be >= in. 1296 */ 1297void 1298tvsub(out, in) 1299 register struct timeval *out, *in; 1300{ 1301 if ((out->tv_usec -= in->tv_usec) < 0) { 1302 out->tv_sec--; 1303 out->tv_usec += 1000000; 1304 } 1305 out->tv_sec -= in->tv_sec; 1306} 1307 1308 1309/* 1310 * Construct an Internet address representation. 1311 * If the nflag has been supplied, give 1312 * numeric value, otherwise try for symbolic name. 1313 */ 1314const char * 1315inetname(sa) 1316 struct sockaddr *sa; 1317{ 1318 register char *cp; 1319 static char line[NI_MAXHOST]; 1320 static char domain[MAXHOSTNAMELEN + 1]; 1321 static int first = 1; 1322 1323 if (first && !nflag) { 1324 first = 0; 1325 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1326 (cp = index(domain, '.'))) 1327 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1328 else 1329 domain[0] = 0; 1330 } 1331 cp = NULL; 1332 if (!nflag) { 1333 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1334 NI_NAMEREQD) == 0) { 1335 if ((cp = index(line, '.')) && 1336 !strcmp(cp + 1, domain)) 1337 *cp = 0; 1338 cp = line; 1339 } 1340 } 1341 if (cp) 1342 return cp; 1343 1344 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1345 NI_NUMERICHOST | niflag) != 0) 1346 strlcpy(line, "invalid", sizeof(line)); 1347 return line; 1348} 1349 1350void 1351usage() 1352{ 1353 (void)fprintf(stderr, 1354"usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1355" [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1356 exit(1); 1357} 1358