traceroute6.c revision 121435
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 121435 2003-10-23 17:36:29Z 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#ifndef HAVE_GETIPNODEBYNAME 301#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 302#define freehostent(x) 303#endif 304 305/* 306 * format of a (udp) probe packet. 307 */ 308struct opacket { 309 u_char seq; /* sequence number of this packet */ 310 u_char hops; /* hop limit of the packet */ 311 struct timeval tv; /* time packet left */ 312}; 313 314u_char packet[512]; /* last inbound (icmp) packet */ 315struct opacket *outpacket; /* last output (udp) packet */ 316 317int main __P((int, char *[])); 318int wait_for_reply __P((int, struct msghdr *)); 319#ifdef IPSEC 320#ifdef IPSEC_POLICY_IPSEC 321int setpolicy __P((int so, char *policy)); 322#endif 323#endif 324void send_probe __P((int, int)); 325struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 326int get_hoplim __P((struct msghdr *)); 327double deltaT __P((struct timeval *, struct timeval *)); 328char *pr_type __P((int)); 329int packet_ok __P((struct msghdr *, int, int)); 330void print __P((struct msghdr *, int)); 331void tvsub __P((struct timeval *, struct timeval *)); 332const char *inetname __P((struct sockaddr *)); 333void usage __P((void)); 334 335int rcvsock; /* receive (icmp) socket file descriptor */ 336int sndsock; /* send (udp) socket file descriptor */ 337struct timezone tz; /* leftover */ 338 339struct msghdr rcvmhdr; 340struct iovec rcviov[2]; 341int rcvhlim; 342struct in6_pktinfo *rcvpktinfo; 343 344struct sockaddr_in6 Src, Dst, Rcv; 345int datalen; /* How much data */ 346/* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 347char rtbuf[2064]; 348#ifdef USE_RFC2292BIS 349struct ip6_rthdr *rth; 350#endif 351struct cmsghdr *cmsg; 352 353char *source = 0; 354char *hostname; 355 356int nprobes = 3; 357int first_hop = 1; 358int max_hops = 30; 359u_short ident; 360u_short port = 32768+666; /* start udp dest port # for probe packets */ 361int options; /* socket options */ 362int verbose; 363int waittime = 5; /* time to wait for response (in seconds) */ 364int nflag; /* print addresses numerically */ 365int lflag; /* print both numerical address & hostname */ 366 367int 368main(argc, argv) 369 int argc; 370 char *argv[]; 371{ 372 struct hostent *hp; 373 int error; 374 struct addrinfo hints, *res; 375 int ch, i, on, probe, seq, hops, rcvcmsglen; 376 static u_char *rcvcmsgbuf; 377 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 378 char *ep; 379 380 /* 381 * Receive ICMP 382 */ 383 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 384 perror("socket(ICMPv6)"); 385 exit(5); 386 } 387 388 /* revoke privs */ 389 seteuid(getuid()); 390 setuid(getuid()); 391 392 /* set a minimum set of socket options */ 393 on = 1; 394 /* specify to tell receiving interface */ 395#ifdef IPV6_RECVPKTINFO 396 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 397 sizeof(on)) < 0) 398 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 399#else /* old adv. API */ 400 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 401 sizeof(on)) < 0) 402 err(1, "setsockopt(IPV6_PKTINFO)"); 403#endif 404 405 /* specify to tell value of hoplimit field of received IP6 hdr */ 406#ifdef IPV6_RECVHOPLIMIT 407 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 408 sizeof(on)) < 0) 409 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 410#else /* old adv. API */ 411 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 412 sizeof(on)) < 0) 413 err(1, "setsockopt(IPV6_HOPLIMIT)"); 414#endif 415 416 seq = 0; 417 418 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 419 switch (ch) { 420 case 'd': 421 options |= SO_DEBUG; 422 break; 423 case 'f': 424 ep = NULL; 425 first_hop = strtoul(optarg, &ep, 0); 426 if (!*argv || *ep) { 427 fprintf(stderr, 428 "traceroute6: invalid min hoplimit.\n"); 429 exit(1); 430 } 431 if (first_hop > max_hops) { 432 fprintf(stderr, 433 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 434 exit(1); 435 } 436 break; 437 case 'g': 438 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 439 if (hp == NULL) { 440 fprintf(stderr, 441 "traceroute6: unknown host %s\n", optarg); 442 exit(1); 443 } 444#ifdef USE_RFC2292BIS 445 if (rth == NULL) { 446 /* 447 * XXX: We can't detect the number of 448 * intermediate nodes yet. 449 */ 450 if ((rth = inet6_rth_init((void *)rtbuf, 451 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 452 0)) == NULL) { 453 fprintf(stderr, 454 "inet6_rth_init failed.\n"); 455 exit(1); 456 } 457 } 458 if (inet6_rth_add((void *)rth, 459 (struct in6_addr *)hp->h_addr)) { 460 fprintf(stderr, 461 "inet6_rth_add failed for %s\n", 462 optarg); 463 exit(1); 464 } 465#else /* old advanced API */ 466 if (cmsg == NULL) 467 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 468 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 469 IPV6_RTHDR_LOOSE); 470#endif 471 freehostent(hp); 472 break; 473 case 'l': 474 lflag++; 475 break; 476 case 'm': 477 ep = NULL; 478 max_hops = strtoul(optarg, &ep, 0); 479 if (!*argv || *ep) { 480 fprintf(stderr, 481 "traceroute6: invalid max hoplimit.\n"); 482 exit(1); 483 } 484 if (max_hops < first_hop) { 485 fprintf(stderr, 486 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 487 exit(1); 488 } 489 break; 490 case 'n': 491 nflag++; 492 break; 493 case 'p': 494 ep = NULL; 495 port = strtoul(optarg, &ep, 0); 496 if (!*argv || *ep) { 497 fprintf(stderr, 498 "traceroute6: port.\n"); 499 exit(1); 500 } 501 if (port < 1) { 502 fprintf(stderr, 503 "traceroute6: port must be >0.\n"); 504 exit(1); 505 } 506 break; 507 case 'q': 508 ep = NULL; 509 nprobes = strtoul(optarg, &ep, 0); 510 if (!*argv || *ep) { 511 fprintf(stderr, 512 "traceroute6: invalid nprobes.\n"); 513 exit(1); 514 } 515 if (nprobes < 1) { 516 fprintf(stderr, 517 "traceroute6: nprobes must be >0.\n"); 518 exit(1); 519 } 520 break; 521 case 'r': 522 options |= SO_DONTROUTE; 523 break; 524 case 's': 525 /* 526 * set the ip source address of the outbound 527 * probe (e.g., on a multi-homed host). 528 */ 529 source = optarg; 530 break; 531 case 'v': 532 verbose++; 533 break; 534 case 'w': 535 ep = NULL; 536 waittime = strtoul(optarg, &ep, 0); 537 if (!*argv || *ep) { 538 fprintf(stderr, 539 "traceroute6: invalid wait time.\n"); 540 exit(1); 541 } 542 if (waittime <= 1) { 543 fprintf(stderr, 544 "traceroute6: wait must be >1 sec.\n"); 545 exit(1); 546 } 547 break; 548 default: 549 usage(); 550 } 551 argc -= optind; 552 argv += optind; 553 554 if (argc < 1 || argc > 2) 555 usage(); 556 557#if 1 558 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 559#else 560 setlinebuf (stdout); 561#endif 562 563 memset(&hints, 0, sizeof(hints)); 564 hints.ai_family = PF_INET6; 565 hints.ai_socktype = SOCK_RAW; 566 hints.ai_protocol = IPPROTO_ICMPV6; 567 hints.ai_flags = AI_CANONNAME; 568 error = getaddrinfo(*argv, NULL, &hints, &res); 569 if (error) { 570 fprintf(stderr, 571 "traceroute6: %s\n", gai_strerror(error)); 572 exit(1); 573 } 574 if (res->ai_addrlen != sizeof(Dst)) { 575 fprintf(stderr, 576 "traceroute6: size of sockaddr mismatch\n"); 577 exit(1); 578 } 579 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 580 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 581 if (!hostname) { 582 fprintf(stderr, "traceroute6: not enough core\n"); 583 exit(1); 584 } 585 586 if (*++argv) { 587 ep = NULL; 588 datalen = strtoul(*argv, &ep, 0); 589 if (!*argv || *ep) { 590 fprintf(stderr, 591 "traceroute6: invalid packet length.\n"); 592 exit(1); 593 } 594 } 595 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 596 fprintf(stderr, 597 "traceroute6: packet size must be 0 <= s < %ld.\n", 598 (long)(MAXPACKET - sizeof(struct opacket))); 599 exit(1); 600 } 601 datalen += sizeof(struct opacket); 602 outpacket = (struct opacket *)malloc((unsigned)datalen); 603 if (! outpacket) { 604 perror("malloc"); 605 exit(1); 606 } 607 (void) bzero((char *)outpacket, datalen); 608 609 /* initialize msghdr for receiving packets */ 610 rcviov[0].iov_base = (caddr_t)packet; 611 rcviov[0].iov_len = sizeof(packet); 612 rcvmhdr.msg_name = (caddr_t)&Rcv; 613 rcvmhdr.msg_namelen = sizeof(Rcv); 614 rcvmhdr.msg_iov = rcviov; 615 rcvmhdr.msg_iovlen = 1; 616 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 617 + CMSG_SPACE(sizeof(int)); 618 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 619 fprintf(stderr, "traceroute6: malloc failed\n"); 620 exit(1); 621 } 622 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 623 rcvmhdr.msg_controllen = rcvcmsglen; 624 625 if (options & SO_DEBUG) 626 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 627 (char *)&on, sizeof(on)); 628 if (options & SO_DONTROUTE) 629 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 630 (char *)&on, sizeof(on)); 631#ifdef IPSEC 632#ifdef IPSEC_POLICY_IPSEC 633 /* 634 * do not raise error even if setsockopt fails, kernel may have ipsec 635 * turned off. 636 */ 637 if (setpolicy(rcvsock, "in bypass") < 0) 638 errx(1, "%s", ipsec_strerror()); 639 if (setpolicy(rcvsock, "out bypass") < 0) 640 errx(1, "%s", ipsec_strerror()); 641#else 642 { 643 int level = IPSEC_LEVEL_NONE; 644 645 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 646 sizeof(level)); 647 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 648 sizeof(level)); 649#ifdef IP_AUTH_TRANS_LEVEL 650 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 651 sizeof(level)); 652#else 653 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 654 sizeof(level)); 655#endif 656#ifdef IP_AUTH_NETWORK_LEVEL 657 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 658 sizeof(level)); 659#endif 660 } 661#endif /*IPSEC_POLICY_IPSEC*/ 662#endif /*IPSEC*/ 663 664 /* 665 * Send UDP 666 */ 667 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 668 perror("socket(SOCK_DGRAM)"); 669 exit(5); 670 } 671#ifdef SO_SNDBUF 672 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 673 sizeof(datalen)) < 0) { 674 perror("setsockopt(SO_SNDBUF)"); 675 exit(6); 676 } 677#endif /* SO_SNDBUF */ 678 if (options & SO_DEBUG) 679 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 680 (char *)&on, sizeof(on)); 681 if (options & SO_DONTROUTE) 682 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 683 (char *)&on, sizeof(on)); 684#ifdef USE_RFC2292BIS 685 if (rth) {/* XXX: there is no library to finalize the header... */ 686 rth->ip6r_len = rth->ip6r_segleft * 2; 687 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 688 (void *)rth, (rth->ip6r_len + 1) << 3)) { 689 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 690 strerror(errno)); 691 exit(1); 692 } 693 } 694#else /* old advanced API */ 695 if (cmsg != NULL) { 696 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 697 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 698 rtbuf, cmsg->cmsg_len) < 0) { 699 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 700 strerror(errno)); 701 exit(1); 702 } 703 } 704#endif /* USE_RFC2292BIS */ 705#ifdef IPSEC 706#ifdef IPSEC_POLICY_IPSEC 707 /* 708 * do not raise error even if setsockopt fails, kernel may have ipsec 709 * turned off. 710 */ 711 if (setpolicy(sndsock, "in bypass") < 0) 712 errx(1, "%s", ipsec_strerror()); 713 if (setpolicy(sndsock, "out bypass") < 0) 714 errx(1, "%s", ipsec_strerror()); 715#else 716 { 717 int level = IPSEC_LEVEL_BYPASS; 718 719 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 720 sizeof(level)); 721 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 722 sizeof(level)); 723#ifdef IP_AUTH_TRANS_LEVEL 724 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 725 sizeof(level)); 726#else 727 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 728 sizeof(level)); 729#endif 730#ifdef IP_AUTH_NETWORK_LEVEL 731 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 732 sizeof(level)); 733#endif 734 } 735#endif /*IPSEC_POLICY_IPSEC*/ 736#endif /*IPSEC*/ 737 738 /* 739 * Source selection 740 */ 741 bzero(&Src, sizeof(Src)); 742 if (source) { 743 struct addrinfo hints, *res; 744 int error; 745 746 memset(&hints, 0, sizeof(hints)); 747 hints.ai_family = AF_INET6; 748 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 749 hints.ai_flags = AI_NUMERICHOST; 750 error = getaddrinfo(source, "0", &hints, &res); 751 if (error) { 752 printf("traceroute6: %s: %s\n", source, 753 gai_strerror(error)); 754 exit(1); 755 } 756 if (res->ai_addrlen > sizeof(Src)) { 757 printf("traceroute6: %s: %s\n", source, 758 gai_strerror(error)); 759 exit(1); 760 } 761 memcpy(&Src, res->ai_addr, res->ai_addrlen); 762 freeaddrinfo(res); 763 } else { 764 struct sockaddr_in6 Nxt; 765 int dummy, len; 766 767 Nxt = Dst; 768 Nxt.sin6_port = htons(DUMMY_PORT); 769 if (cmsg != NULL) 770 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 771 sizeof(Nxt.sin6_addr)); 772 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 773 perror("socket"); 774 exit(1); 775 } 776 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 777 perror("connect"); 778 exit(1); 779 } 780 len = sizeof(Src); 781 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 782 perror("getsockname"); 783 exit(1); 784 } 785 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 786 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 787 fprintf(stderr, "getnameinfo failed for source\n"); 788 exit(1); 789 } 790 source = src0; 791 close(dummy); 792 } 793 794 ident = (getpid() & 0xffff) | 0x8000; 795 Src.sin6_port = htons(ident); 796 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 797 perror("bind"); 798 exit(1); 799 } 800 801 if (ident == 0) { 802 socklen_t len; 803 804 len = sizeof(Src); 805 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 806 perror("getsockname"); 807 exit(1); 808 } 809 ident = ntohs(Src.sin6_port); 810 } 811 812 /* 813 * Message to users 814 */ 815 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 816 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 817 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 818 fprintf(stderr, "traceroute6"); 819 fprintf(stderr, " to %s (%s)", hostname, hbuf); 820 if (source) 821 fprintf(stderr, " from %s", source); 822 fprintf(stderr, ", %d hops max, %d byte packets\n", 823 max_hops, datalen); 824 (void) fflush(stderr); 825 826 if (first_hop > 1) 827 printf("Skipping %d intermediate hops\n", first_hop - 1); 828 829 /* 830 * Main loop 831 */ 832 for (hops = first_hop; hops <= max_hops; ++hops) { 833 struct in6_addr lastaddr; 834 int got_there = 0; 835 int unreachable = 0; 836 837 printf("%2d ", hops); 838 bzero(&lastaddr, sizeof(lastaddr)); 839 for (probe = 0; probe < nprobes; ++probe) { 840 int cc; 841 struct timeval t1, t2; 842 struct timezone tz; 843 844 (void) gettimeofday(&t1, &tz); 845 send_probe(++seq, hops); 846 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 847 (void) gettimeofday(&t2, &tz); 848 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 849 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 850 &lastaddr)) { 851 print(&rcvmhdr, cc); 852 lastaddr = Rcv.sin6_addr; 853 } 854 printf(" %.3f ms", deltaT(&t1, &t2)); 855 switch (i - 1) { 856 case ICMP6_DST_UNREACH_NOROUTE: 857 ++unreachable; 858 printf(" !N"); 859 break; 860 case ICMP6_DST_UNREACH_ADMIN: 861 ++unreachable; 862 printf(" !P"); 863 break; 864 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 865 ++unreachable; 866 printf(" !S"); 867 break; 868 case ICMP6_DST_UNREACH_ADDR: 869 ++unreachable; 870 printf(" !A"); 871 break; 872 case ICMP6_DST_UNREACH_NOPORT: 873 if (rcvhlim >= 0 && 874 rcvhlim <= 1) 875 printf(" !"); 876 ++got_there; 877 break; 878 } 879 break; 880 } 881 } 882 if (cc == 0) 883 printf(" *"); 884 (void) fflush(stdout); 885 } 886 putchar('\n'); 887 if (got_there || 888 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 889 exit(0); 890 } 891 } 892 893 exit(0); 894} 895 896int 897wait_for_reply(sock, mhdr) 898 int sock; 899 struct msghdr *mhdr; 900{ 901#ifdef HAVE_POLL 902 struct pollfd pfd[1]; 903 int cc = 0; 904 905 pfd[0].fd = sock; 906 pfd[0].events = POLLIN; 907 pfd[0].revents = 0; 908 909 if (poll(pfd, 1, waittime * 1000) > 0) 910 cc = recvmsg(rcvsock, mhdr, 0); 911 912 return(cc); 913#else 914 fd_set *fdsp; 915 struct timeval wait; 916 int cc = 0, fdsn; 917 918 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 919 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 920 err(1, "malloc"); 921 memset(fdsp, 0, fdsn); 922 FD_SET(sock, fdsp); 923 wait.tv_sec = waittime; wait.tv_usec = 0; 924 925 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 926 cc = recvmsg(rcvsock, mhdr, 0); 927 928 free(fdsp); 929 return(cc); 930#endif 931} 932 933#ifdef IPSEC 934#ifdef IPSEC_POLICY_IPSEC 935int 936setpolicy(so, policy) 937 int so; 938 char *policy; 939{ 940 char *buf; 941 942 buf = ipsec_set_policy(policy, strlen(policy)); 943 if (buf == NULL) { 944 warnx("%s", ipsec_strerror()); 945 return -1; 946 } 947 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 948 buf, ipsec_get_policylen(buf)); 949 950 free(buf); 951 952 return 0; 953} 954#endif 955#endif 956 957void 958send_probe(seq, hops) 959 int seq, hops; 960{ 961 struct opacket *op = outpacket; 962 int i; 963 964 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 965 (char *)&hops, sizeof(hops)) < 0) { 966 perror("setsockopt IPV6_UNICAST_HOPS"); 967 } 968 969 Dst.sin6_port = htons(port + seq); 970 971 op->seq = seq; 972 op->hops = hops; 973 (void) gettimeofday(&op->tv, &tz); 974 975 i = sendto(sndsock, (char *)outpacket, datalen, 0, 976 (struct sockaddr *)&Dst, Dst.sin6_len); 977 if (i < 0 || i != datalen) { 978 if (i<0) 979 perror("sendto"); 980 printf("traceroute6: wrote %s %d chars, ret=%d\n", 981 hostname, datalen, i); 982 (void) fflush(stdout); 983 } 984} 985 986int 987get_hoplim(mhdr) 988 struct msghdr *mhdr; 989{ 990 struct cmsghdr *cm; 991 992 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 993 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 994 if (cm->cmsg_level == IPPROTO_IPV6 && 995 cm->cmsg_type == IPV6_HOPLIMIT && 996 cm->cmsg_len == CMSG_LEN(sizeof(int))) 997 return(*(int *)CMSG_DATA(cm)); 998 } 999 1000 return(-1); 1001} 1002 1003double 1004deltaT(t1p, t2p) 1005 struct timeval *t1p, *t2p; 1006{ 1007 register double dt; 1008 1009 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1010 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1011 return (dt); 1012} 1013 1014/* 1015 * Convert an ICMP "type" field to a printable string. 1016 */ 1017char * 1018pr_type(t0) 1019 int t0; 1020{ 1021 u_char t = t0 & 0xff; 1022 char *cp; 1023 1024 switch (t) { 1025 case ICMP6_DST_UNREACH: 1026 cp = "Destination Unreachable"; 1027 break; 1028 case ICMP6_PACKET_TOO_BIG: 1029 cp = "Packet Too Big"; 1030 break; 1031 case ICMP6_TIME_EXCEEDED: 1032 cp = "Time Exceeded"; 1033 break; 1034 case ICMP6_PARAM_PROB: 1035 cp = "Parameter Problem"; 1036 break; 1037 case ICMP6_ECHO_REQUEST: 1038 cp = "Echo Request"; 1039 break; 1040 case ICMP6_ECHO_REPLY: 1041 cp = "Echo Reply"; 1042 break; 1043 case ICMP6_MEMBERSHIP_QUERY: 1044 cp = "Group Membership Query"; 1045 break; 1046 case ICMP6_MEMBERSHIP_REPORT: 1047 cp = "Group Membership Report"; 1048 break; 1049 case ICMP6_MEMBERSHIP_REDUCTION: 1050 cp = "Group Membership Reduction"; 1051 break; 1052 case ND_ROUTER_SOLICIT: 1053 cp = "Router Solicitation"; 1054 break; 1055 case ND_ROUTER_ADVERT: 1056 cp = "Router Advertisement"; 1057 break; 1058 case ND_NEIGHBOR_SOLICIT: 1059 cp = "Neighbor Solicitation"; 1060 break; 1061 case ND_NEIGHBOR_ADVERT: 1062 cp = "Neighbor Advertisement"; 1063 break; 1064 case ND_REDIRECT: 1065 cp = "Redirect"; 1066 break; 1067 default: 1068 cp = "Unknown"; 1069 break; 1070 } 1071 return cp; 1072} 1073 1074int 1075packet_ok(mhdr, cc, seq) 1076 struct msghdr *mhdr; 1077 int cc; 1078 int seq; 1079{ 1080 register struct icmp6_hdr *icp; 1081 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1082 u_char type, code; 1083 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1084 struct cmsghdr *cm; 1085 int *hlimp; 1086 char hbuf[NI_MAXHOST]; 1087 1088#ifdef OLDRAWSOCKET 1089 int hlen; 1090 struct ip6_hdr *ip; 1091#endif 1092 1093#ifdef OLDRAWSOCKET 1094 ip = (struct ip6_hdr *) buf; 1095 hlen = sizeof(struct ip6_hdr); 1096 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1097 if (verbose) { 1098 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1099 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1100 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1101 printf("packet too short (%d bytes) from %s\n", cc, 1102 hbuf); 1103 } 1104 return (0); 1105 } 1106 cc -= hlen; 1107 icp = (struct icmp6_hdr *)(buf + hlen); 1108#else 1109 if (cc < sizeof(struct icmp6_hdr)) { 1110 if (verbose) { 1111 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1112 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1113 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1114 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1115 } 1116 return(0); 1117 } 1118 icp = (struct icmp6_hdr *)buf; 1119#endif 1120 /* get optional information via advanced API */ 1121 rcvpktinfo = NULL; 1122 hlimp = NULL; 1123 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1124 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1125 if (cm->cmsg_level == IPPROTO_IPV6 && 1126 cm->cmsg_type == IPV6_PKTINFO && 1127 cm->cmsg_len == 1128 CMSG_LEN(sizeof(struct in6_pktinfo))) 1129 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1130 1131 if (cm->cmsg_level == IPPROTO_IPV6 && 1132 cm->cmsg_type == IPV6_HOPLIMIT && 1133 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1134 hlimp = (int *)CMSG_DATA(cm); 1135 } 1136 if (rcvpktinfo == NULL || hlimp == NULL) { 1137 warnx("failed to get received hop limit or packet info"); 1138#if 0 1139 return(0); 1140#else 1141 rcvhlim = 0; /*XXX*/ 1142#endif 1143 } 1144 else 1145 rcvhlim = *hlimp; 1146 1147 type = icp->icmp6_type; 1148 code = icp->icmp6_code; 1149 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1150 || type == ICMP6_DST_UNREACH) { 1151 struct ip6_hdr *hip; 1152 struct udphdr *up; 1153 1154 hip = (struct ip6_hdr *)(icp + 1); 1155 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1156 if (verbose) 1157 warnx("failed to get upper layer header"); 1158 return(0); 1159 } 1160 if (up->uh_sport == htons(ident) && 1161 up->uh_dport == htons(port+seq)) 1162 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1163 } 1164 if (verbose) { 1165 int i; 1166 u_int8_t *p; 1167 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1168 1169 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1170 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1171 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1172 printf("\n%d bytes from %s to %s", cc, sbuf, 1173 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1174 dbuf, sizeof(dbuf)) : "?"); 1175 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1176 icp->icmp6_code); 1177 p = (u_int8_t *)(icp + 1); 1178#define WIDTH 16 1179 for (i = 0; i < cc; i++) { 1180 if (i % WIDTH == 0) 1181 printf("%04x:", i); 1182 if (i % 4 == 0) 1183 printf(" "); 1184 printf("%02x", p[i]); 1185 if (i % WIDTH == WIDTH - 1) 1186 printf("\n"); 1187 } 1188 if (cc % WIDTH != 0) 1189 printf("\n"); 1190 } 1191 return(0); 1192} 1193 1194/* 1195 * Increment pointer until find the UDP header. 1196 */ 1197struct udphdr * 1198get_udphdr(ip6, lim) 1199 struct ip6_hdr *ip6; 1200 u_char *lim; 1201{ 1202 u_char *cp = (u_char *)ip6, nh; 1203 int hlen; 1204 1205 if (cp + sizeof(*ip6) >= lim) 1206 return(NULL); 1207 1208 nh = ip6->ip6_nxt; 1209 cp += sizeof(struct ip6_hdr); 1210 1211 while (lim - cp >= 8) { 1212 switch (nh) { 1213 case IPPROTO_ESP: 1214 case IPPROTO_TCP: 1215 case IPPROTO_ICMPV6: 1216 return(NULL); 1217 case IPPROTO_UDP: 1218 return((struct udphdr *)cp); 1219 case IPPROTO_FRAGMENT: 1220 hlen = sizeof(struct ip6_frag); 1221 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1222 break; 1223 case IPPROTO_AH: 1224 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1225 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1226 break; 1227 default: 1228 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1229 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1230 break; 1231 } 1232 1233 cp += hlen; 1234 } 1235 1236 return(NULL); 1237} 1238 1239void 1240print(mhdr, cc) 1241 struct msghdr *mhdr; 1242 int cc; 1243{ 1244 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1245 char hbuf[NI_MAXHOST]; 1246 1247 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1248 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1249 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1250 if (nflag) 1251 printf(" %s", hbuf); 1252 else if (lflag) 1253 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1254 else 1255 printf(" %s", inetname((struct sockaddr *)from)); 1256 1257 if (verbose) { 1258#ifdef OLDRAWSOCKET 1259 printf(" %d bytes to %s", cc, 1260 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1261 hbuf, sizeof(hbuf)) : "?"); 1262#else 1263 printf(" %d bytes of data to %s", cc, 1264 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1265 hbuf, sizeof(hbuf)) : "?"); 1266#endif 1267 } 1268} 1269 1270/* 1271 * Subtract 2 timeval structs: out = out - in. 1272 * Out is assumed to be >= in. 1273 */ 1274void 1275tvsub(out, in) 1276 register struct timeval *out, *in; 1277{ 1278 1279 if ((out->tv_usec -= in->tv_usec) < 0) { 1280 out->tv_sec--; 1281 out->tv_usec += 1000000; 1282 } 1283 out->tv_sec -= in->tv_sec; 1284} 1285 1286/* 1287 * Construct an Internet address representation. 1288 * If the nflag has been supplied, give 1289 * numeric value, otherwise try for symbolic name. 1290 */ 1291const char * 1292inetname(sa) 1293 struct sockaddr *sa; 1294{ 1295 register char *cp; 1296 static char line[NI_MAXHOST]; 1297 static char domain[MAXHOSTNAMELEN + 1]; 1298 static int first = 1; 1299 1300 if (first && !nflag) { 1301 first = 0; 1302 if (gethostname(domain, sizeof(domain)) == 0 && 1303 (cp = strchr(domain, '.'))) 1304 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1305 else 1306 domain[0] = 0; 1307 } 1308 cp = NULL; 1309 if (!nflag) { 1310 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1311 NI_NAMEREQD) == 0) { 1312 if ((cp = strchr(line, '.')) && 1313 !strcmp(cp + 1, domain)) 1314 *cp = 0; 1315 cp = line; 1316 } 1317 } 1318 if (cp) 1319 return cp; 1320 1321 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1322 NI_NUMERICHOST) != 0) 1323 strlcpy(line, "invalid", sizeof(line)); 1324 return line; 1325} 1326 1327void 1328usage() 1329{ 1330 (void)fprintf(stderr, 1331"usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1332" [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1333 exit(1); 1334} 1335