traceroute6.c revision 169144
1/* $KAME: traceroute6.c,v 1.68 2004/01/25 11:16:12 suz 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 169144 2007-04-30 19:08:13Z maxim $"; 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#include <sys/sysctl.h> 260 261#include <netinet/in.h> 262 263#include <arpa/inet.h> 264 265#include <netdb.h> 266#include <stdio.h> 267#include <err.h> 268#ifdef HAVE_POLL 269#include <poll.h> 270#endif 271#include <errno.h> 272#include <stdlib.h> 273#include <string.h> 274#include <unistd.h> 275 276#include <netinet/ip6.h> 277#include <netinet/icmp6.h> 278#include <netinet/udp.h> 279 280#ifdef IPSEC 281#include <net/route.h> 282#include <netinet6/ipsec.h> 283#endif 284 285#define DUMMY_PORT 10010 286 287#define MAXPACKET 65535 /* max ip packet size */ 288 289#ifndef HAVE_GETIPNODEBYNAME 290#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 291#define freehostent(x) 292#endif 293 294/* 295 * format of a (udp) probe packet. 296 */ 297struct tv32 { 298 u_int32_t tv32_sec; 299 u_int32_t tv32_usec; 300}; 301 302struct opacket { 303 u_char seq; /* sequence number of this packet */ 304 u_char hops; /* hop limit of the packet */ 305 u_char pad[2]; 306 struct tv32 tv; /* time packet left */ 307} __attribute__((__packed__)); 308 309u_char packet[512]; /* last inbound (icmp) packet */ 310struct opacket *outpacket; /* last output (udp) packet */ 311 312int main __P((int, char *[])); 313int wait_for_reply __P((int, struct msghdr *)); 314#ifdef IPSEC 315#ifdef IPSEC_POLICY_IPSEC 316int setpolicy __P((int so, char *policy)); 317#endif 318#endif 319void send_probe __P((int, u_long)); 320struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 321int get_hoplim __P((struct msghdr *)); 322double deltaT __P((struct timeval *, struct timeval *)); 323char *pr_type __P((int)); 324int packet_ok __P((struct msghdr *, int, int)); 325void print __P((struct msghdr *, int)); 326const char *inetname __P((struct sockaddr *)); 327void usage __P((void)); 328 329int rcvsock; /* receive (icmp) socket file descriptor */ 330int sndsock; /* send (udp) socket file descriptor */ 331 332struct msghdr rcvmhdr; 333struct iovec rcviov[2]; 334int rcvhlim; 335struct in6_pktinfo *rcvpktinfo; 336 337struct sockaddr_in6 Src, Dst, Rcv; 338u_long datalen; /* How much data */ 339#define ICMP6ECHOLEN 8 340/* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 341char rtbuf[2064]; 342#ifdef USE_RFC2292BIS 343struct ip6_rthdr *rth; 344#endif 345struct cmsghdr *cmsg; 346 347char *source = 0; 348char *hostname; 349 350u_long nprobes = 3; 351u_long first_hop = 1; 352u_long max_hops = 30; 353u_int16_t srcport; 354u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 355u_int16_t ident; 356int options; /* socket options */ 357int verbose; 358int waittime = 5; /* time to wait for response (in seconds) */ 359int nflag; /* print addresses numerically */ 360int useicmp; 361int lflag; /* print both numerical address & hostname */ 362 363int 364main(argc, argv) 365 int argc; 366 char *argv[]; 367{ 368 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 369 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 370 int ch, i, on = 1, seq, rcvcmsglen, error, minlen; 371 struct addrinfo hints, *res; 372 static u_char *rcvcmsgbuf; 373 u_long probe, hops, lport; 374 struct hostent *hp; 375 size_t size; 376 uid_t uid; 377 378 /* 379 * Receive ICMP 380 */ 381 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 382 perror("socket(ICMPv6)"); 383 exit(5); 384 } 385 386 /* revoke privs */ 387 uid = getuid(); 388 if (setresuid(uid, uid, uid) == -1) { 389 perror("setresuid"); 390 exit(1); 391 } 392 393 size = sizeof(i); 394 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 395 max_hops = i; 396 397 /* specify to tell receiving interface */ 398#ifdef IPV6_RECVPKTINFO 399 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 400 sizeof(on)) < 0) 401 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 402#else /* old adv. API */ 403 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 404 sizeof(on)) < 0) 405 err(1, "setsockopt(IPV6_PKTINFO)"); 406#endif 407 408 /* specify to tell value of hoplimit field of received IP6 hdr */ 409#ifdef IPV6_RECVHOPLIMIT 410 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 411 sizeof(on)) < 0) 412 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 413#else /* old adv. API */ 414 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 415 sizeof(on)) < 0) 416 err(1, "setsockopt(IPV6_HOPLIMIT)"); 417#endif 418 419 seq = 0; 420 421 while ((ch = getopt(argc, argv, "df:g:Ilm:np:q:rs:w:v")) != -1) 422 switch (ch) { 423 case 'd': 424 options |= SO_DEBUG; 425 break; 426 case 'f': 427 ep = NULL; 428 errno = 0; 429 first_hop = strtoul(optarg, &ep, 0); 430 if (errno || !*optarg || *ep || first_hop > 255) { 431 fprintf(stderr, 432 "traceroute6: invalid min hoplimit.\n"); 433 exit(1); 434 } 435 break; 436 case 'g': 437 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 438 if (hp == NULL) { 439 fprintf(stderr, 440 "traceroute6: unknown host %s\n", optarg); 441 exit(1); 442 } 443#ifdef USE_RFC2292BIS 444 if (rth == NULL) { 445 /* 446 * XXX: We can't detect the number of 447 * intermediate nodes yet. 448 */ 449 if ((rth = inet6_rth_init((void *)rtbuf, 450 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 451 0)) == NULL) { 452 fprintf(stderr, 453 "inet6_rth_init failed.\n"); 454 exit(1); 455 } 456 } 457 if (inet6_rth_add((void *)rth, 458 (struct in6_addr *)hp->h_addr)) { 459 fprintf(stderr, 460 "inet6_rth_add failed for %s\n", 461 optarg); 462 exit(1); 463 } 464#else /* old advanced API */ 465 if (cmsg == NULL) 466 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 467 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 468 IPV6_RTHDR_LOOSE); 469#endif 470 freehostent(hp); 471 break; 472 case 'I': 473 useicmp++; 474 ident = htons(getpid() & 0xffff); /* same as ping6 */ 475 break; 476 case 'l': 477 lflag++; 478 break; 479 case 'm': 480 ep = NULL; 481 errno = 0; 482 max_hops = strtoul(optarg, &ep, 0); 483 if (errno || !*optarg || *ep || max_hops > 255) { 484 fprintf(stderr, 485 "traceroute6: invalid max hoplimit.\n"); 486 exit(1); 487 } 488 break; 489 case 'n': 490 nflag++; 491 break; 492 case 'p': 493 ep = NULL; 494 errno = 0; 495 lport = strtoul(optarg, &ep, 0); 496 if (errno || !*optarg || *ep) { 497 fprintf(stderr, "traceroute6: invalid port.\n"); 498 exit(1); 499 } 500 if (lport == 0 || lport != (lport & 0xffff)) { 501 fprintf(stderr, 502 "traceroute6: port out of range.\n"); 503 exit(1); 504 } 505 port = lport & 0xffff; 506 break; 507 case 'q': 508 ep = NULL; 509 errno = 0; 510 nprobes = strtoul(optarg, &ep, 0); 511 if (errno || !*optarg || *ep) { 512 fprintf(stderr, 513 "traceroute6: invalid nprobes.\n"); 514 exit(1); 515 } 516 if (nprobes < 1) { 517 fprintf(stderr, 518 "traceroute6: nprobes must be >0.\n"); 519 exit(1); 520 } 521 break; 522 case 'r': 523 options |= SO_DONTROUTE; 524 break; 525 case 's': 526 /* 527 * set the ip source address of the outbound 528 * probe (e.g., on a multi-homed host). 529 */ 530 source = optarg; 531 break; 532 case 'v': 533 verbose++; 534 break; 535 case 'w': 536 ep = NULL; 537 errno = 0; 538 waittime = strtoul(optarg, &ep, 0); 539 if (errno || !*optarg || *ep) { 540 fprintf(stderr, 541 "traceroute6: invalid wait time.\n"); 542 exit(1); 543 } 544 if (waittime < 1) { 545 fprintf(stderr, 546 "traceroute6: wait must be >= 1 sec.\n"); 547 exit(1); 548 } 549 break; 550 default: 551 usage(); 552 } 553 argc -= optind; 554 argv += optind; 555 556 if (max_hops < first_hop) { 557 fprintf(stderr, 558 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 559 exit(1); 560 } 561 562 if (argc < 1 || argc > 2) 563 usage(); 564 565#if 1 566 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 567#else 568 setlinebuf(stdout); 569#endif 570 571 memset(&hints, 0, sizeof(hints)); 572 hints.ai_family = PF_INET6; 573 hints.ai_socktype = SOCK_RAW; 574 hints.ai_protocol = IPPROTO_ICMPV6; 575 hints.ai_flags = AI_CANONNAME; 576 error = getaddrinfo(*argv, NULL, &hints, &res); 577 if (error) { 578 fprintf(stderr, 579 "traceroute6: %s\n", gai_strerror(error)); 580 exit(1); 581 } 582 if (res->ai_addrlen != sizeof(Dst)) { 583 fprintf(stderr, 584 "traceroute6: size of sockaddr mismatch\n"); 585 exit(1); 586 } 587 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 588 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 589 if (!hostname) { 590 fprintf(stderr, "traceroute6: not enough core\n"); 591 exit(1); 592 } 593 if (res->ai_next) { 594 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 595 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 596 strlcpy(hbuf, "?", sizeof(hbuf)); 597 fprintf(stderr, "traceroute6: Warning: %s has multiple " 598 "addresses; using %s\n", hostname, hbuf); 599 } 600 601 if (*++argv) { 602 ep = NULL; 603 errno = 0; 604 datalen = strtoul(*argv, &ep, 0); 605 if (errno || !*argv || *ep) { 606 fprintf(stderr, 607 "traceroute6: invalid packet length.\n"); 608 exit(1); 609 } 610 } 611 if (useicmp) 612 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 613 else 614 minlen = sizeof(struct opacket); 615 if (datalen < minlen) 616 datalen = minlen; 617 else if (datalen >= MAXPACKET) { 618 fprintf(stderr, 619 "traceroute6: packet size must be %d <= s < %ld.\n", 620 minlen, (long)MAXPACKET); 621 exit(1); 622 } 623 outpacket = (struct opacket *)malloc((unsigned)datalen); 624 if (!outpacket) { 625 perror("malloc"); 626 exit(1); 627 } 628 (void) bzero((char *)outpacket, datalen); 629 630 /* initialize msghdr for receiving packets */ 631 rcviov[0].iov_base = (caddr_t)packet; 632 rcviov[0].iov_len = sizeof(packet); 633 rcvmhdr.msg_name = (caddr_t)&Rcv; 634 rcvmhdr.msg_namelen = sizeof(Rcv); 635 rcvmhdr.msg_iov = rcviov; 636 rcvmhdr.msg_iovlen = 1; 637 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 638 CMSG_SPACE(sizeof(int)); 639 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 640 fprintf(stderr, "traceroute6: malloc failed\n"); 641 exit(1); 642 } 643 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 644 rcvmhdr.msg_controllen = rcvcmsglen; 645 646 if (options & SO_DEBUG) 647 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 648 (char *)&on, sizeof(on)); 649 if (options & SO_DONTROUTE) 650 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 651 (char *)&on, sizeof(on)); 652#ifdef IPSEC 653#ifdef IPSEC_POLICY_IPSEC 654 /* 655 * do not raise error even if setsockopt fails, kernel may have ipsec 656 * turned off. 657 */ 658 if (setpolicy(rcvsock, "in bypass") < 0) 659 errx(1, "%s", ipsec_strerror()); 660 if (setpolicy(rcvsock, "out bypass") < 0) 661 errx(1, "%s", ipsec_strerror()); 662#else 663 { 664 int level = IPSEC_LEVEL_NONE; 665 666 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 667 sizeof(level)); 668 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 669 sizeof(level)); 670#ifdef IP_AUTH_TRANS_LEVEL 671 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 672 sizeof(level)); 673#else 674 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 675 sizeof(level)); 676#endif 677#ifdef IP_AUTH_NETWORK_LEVEL 678 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 679 sizeof(level)); 680#endif 681 } 682#endif /*IPSEC_POLICY_IPSEC*/ 683#endif /*IPSEC*/ 684 685 /* 686 * Send UDP or ICMP 687 */ 688 if (useicmp) { 689 sndsock = rcvsock; 690 } else { 691 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 692 perror("socket(SOCK_DGRAM)"); 693 exit(5); 694 } 695 } 696#ifdef SO_SNDBUF 697 i = datalen; 698 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 699 sizeof(i)) < 0) { 700 perror("setsockopt(SO_SNDBUF)"); 701 exit(6); 702 } 703#endif /* SO_SNDBUF */ 704 if (options & SO_DEBUG) 705 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 706 (char *)&on, sizeof(on)); 707 if (options & SO_DONTROUTE) 708 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 709 (char *)&on, sizeof(on)); 710#ifdef USE_RFC2292BIS 711 if (rth) {/* XXX: there is no library to finalize the header... */ 712 rth->ip6r_len = rth->ip6r_segleft * 2; 713 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 714 (void *)rth, (rth->ip6r_len + 1) << 3)) { 715 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 716 strerror(errno)); 717 exit(1); 718 } 719 } 720#else /* old advanced API */ 721 if (cmsg != NULL) { 722 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 723 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 724 rtbuf, cmsg->cmsg_len) < 0) { 725 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 726 strerror(errno)); 727 exit(1); 728 } 729 } 730#endif /* USE_RFC2292BIS */ 731#ifdef IPSEC 732#ifdef IPSEC_POLICY_IPSEC 733 /* 734 * do not raise error even if setsockopt fails, kernel may have ipsec 735 * turned off. 736 */ 737 if (setpolicy(sndsock, "in bypass") < 0) 738 errx(1, "%s", ipsec_strerror()); 739 if (setpolicy(sndsock, "out bypass") < 0) 740 errx(1, "%s", ipsec_strerror()); 741#else 742 { 743 int level = IPSEC_LEVEL_BYPASS; 744 745 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 746 sizeof(level)); 747 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 748 sizeof(level)); 749#ifdef IP_AUTH_TRANS_LEVEL 750 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 751 sizeof(level)); 752#else 753 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 754 sizeof(level)); 755#endif 756#ifdef IP_AUTH_NETWORK_LEVEL 757 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 758 sizeof(level)); 759#endif 760 } 761#endif /*IPSEC_POLICY_IPSEC*/ 762#endif /*IPSEC*/ 763 764 /* 765 * Source selection 766 */ 767 bzero(&Src, sizeof(Src)); 768 if (source) { 769 struct addrinfo hints, *res; 770 int error; 771 772 memset(&hints, 0, sizeof(hints)); 773 hints.ai_family = AF_INET6; 774 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 775 hints.ai_flags = AI_NUMERICHOST; 776 error = getaddrinfo(source, "0", &hints, &res); 777 if (error) { 778 printf("traceroute6: %s: %s\n", source, 779 gai_strerror(error)); 780 exit(1); 781 } 782 if (res->ai_addrlen > sizeof(Src)) { 783 printf("traceroute6: %s: %s\n", source, 784 gai_strerror(error)); 785 exit(1); 786 } 787 memcpy(&Src, res->ai_addr, res->ai_addrlen); 788 freeaddrinfo(res); 789 } else { 790 struct sockaddr_in6 Nxt; 791 int dummy; 792 socklen_t len; 793 794 Nxt = Dst; 795 Nxt.sin6_port = htons(DUMMY_PORT); 796 if (cmsg != NULL) 797 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 798 sizeof(Nxt.sin6_addr)); 799 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 800 perror("socket"); 801 exit(1); 802 } 803 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 804 perror("connect"); 805 exit(1); 806 } 807 len = sizeof(Src); 808 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 809 perror("getsockname"); 810 exit(1); 811 } 812 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 813 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 814 fprintf(stderr, "getnameinfo failed for source\n"); 815 exit(1); 816 } 817 source = src0; 818 close(dummy); 819 } 820 821 Src.sin6_port = htons(0); 822 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 823 perror("bind"); 824 exit(1); 825 } 826 827 { 828 socklen_t len; 829 830 len = sizeof(Src); 831 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 832 perror("getsockname"); 833 exit(1); 834 } 835 srcport = ntohs(Src.sin6_port); 836 } 837 838 /* 839 * Message to users 840 */ 841 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 842 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 843 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 844 fprintf(stderr, "traceroute6"); 845 fprintf(stderr, " to %s (%s)", hostname, hbuf); 846 if (source) 847 fprintf(stderr, " from %s", source); 848 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 849 max_hops, datalen); 850 (void) fflush(stderr); 851 852 if (first_hop > 1) 853 printf("Skipping %lu intermediate hops\n", first_hop - 1); 854 855 /* 856 * Main loop 857 */ 858 for (hops = first_hop; hops <= max_hops; ++hops) { 859 struct in6_addr lastaddr; 860 int got_there = 0; 861 int unreachable = 0; 862 863 printf("%2lu ", hops); 864 bzero(&lastaddr, sizeof(lastaddr)); 865 for (probe = 0; probe < nprobes; ++probe) { 866 int cc; 867 struct timeval t1, t2; 868 869 (void) gettimeofday(&t1, NULL); 870 send_probe(++seq, hops); 871 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 872 (void) gettimeofday(&t2, NULL); 873 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 874 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 875 &lastaddr)) { 876 print(&rcvmhdr, cc); 877 lastaddr = Rcv.sin6_addr; 878 } 879 printf(" %.3f ms", deltaT(&t1, &t2)); 880 switch (i - 1) { 881 case ICMP6_DST_UNREACH_NOROUTE: 882 ++unreachable; 883 printf(" !N"); 884 break; 885 case ICMP6_DST_UNREACH_ADMIN: 886 ++unreachable; 887 printf(" !P"); 888 break; 889 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 890 ++unreachable; 891 printf(" !S"); 892 break; 893 case ICMP6_DST_UNREACH_ADDR: 894 ++unreachable; 895 printf(" !A"); 896 break; 897 case ICMP6_DST_UNREACH_NOPORT: 898 if (rcvhlim >= 0 && 899 rcvhlim <= 1) 900 printf(" !"); 901 ++got_there; 902 break; 903 } 904 break; 905 } 906 } 907 if (cc == 0) 908 printf(" *"); 909 (void) fflush(stdout); 910 } 911 putchar('\n'); 912 if (got_there || 913 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 914 exit(0); 915 } 916 } 917 918 exit(0); 919} 920 921int 922wait_for_reply(sock, mhdr) 923 int sock; 924 struct msghdr *mhdr; 925{ 926#ifdef HAVE_POLL 927 struct pollfd pfd[1]; 928 int cc = 0; 929 930 pfd[0].fd = sock; 931 pfd[0].events = POLLIN; 932 pfd[0].revents = 0; 933 934 if (poll(pfd, 1, waittime * 1000) > 0) 935 cc = recvmsg(rcvsock, mhdr, 0); 936 937 return(cc); 938#else 939 fd_set *fdsp; 940 struct timeval wait; 941 int cc = 0, fdsn; 942 943 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 944 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 945 err(1, "malloc"); 946 memset(fdsp, 0, fdsn); 947 FD_SET(sock, fdsp); 948 wait.tv_sec = waittime; wait.tv_usec = 0; 949 950 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 951 cc = recvmsg(rcvsock, mhdr, 0); 952 953 free(fdsp); 954 return(cc); 955#endif 956} 957 958#ifdef IPSEC 959#ifdef IPSEC_POLICY_IPSEC 960int 961setpolicy(so, policy) 962 int so; 963 char *policy; 964{ 965 char *buf; 966 967 buf = ipsec_set_policy(policy, strlen(policy)); 968 if (buf == NULL) { 969 warnx("%s", ipsec_strerror()); 970 return -1; 971 } 972 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 973 buf, ipsec_get_policylen(buf)); 974 975 free(buf); 976 977 return 0; 978} 979#endif 980#endif 981 982void 983send_probe(seq, hops) 984 int seq; 985 u_long hops; 986{ 987 struct timeval tv; 988 struct tv32 tv32; 989 int i; 990 991 i = hops; 992 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 993 (char *)&i, sizeof(i)) < 0) { 994 perror("setsockopt IPV6_UNICAST_HOPS"); 995 } 996 997 Dst.sin6_port = htons(port + seq); 998 (void) gettimeofday(&tv, NULL); 999 tv32.tv32_sec = htonl(tv.tv_sec); 1000 tv32.tv32_usec = htonl(tv.tv_usec); 1001 1002 if (useicmp) { 1003 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 1004 1005 icp->icmp6_type = ICMP6_ECHO_REQUEST; 1006 icp->icmp6_code = 0; 1007 icp->icmp6_cksum = 0; 1008 icp->icmp6_id = ident; 1009 icp->icmp6_seq = htons(seq); 1010 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 1011 sizeof(tv32)); 1012 } else { 1013 struct opacket *op = outpacket; 1014 1015 op->seq = seq; 1016 op->hops = hops; 1017 bcopy(&tv32, &op->tv, sizeof tv32); 1018 } 1019 1020 i = sendto(sndsock, (char *)outpacket, datalen, 0, 1021 (struct sockaddr *)&Dst, Dst.sin6_len); 1022 if (i < 0 || i != datalen) { 1023 if (i < 0) 1024 perror("sendto"); 1025 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 1026 hostname, datalen, i); 1027 (void) fflush(stdout); 1028 } 1029} 1030 1031int 1032get_hoplim(mhdr) 1033 struct msghdr *mhdr; 1034{ 1035 struct cmsghdr *cm; 1036 1037 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1038 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1039 if (cm->cmsg_level == IPPROTO_IPV6 && 1040 cm->cmsg_type == IPV6_HOPLIMIT && 1041 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1042 return(*(int *)CMSG_DATA(cm)); 1043 } 1044 1045 return(-1); 1046} 1047 1048double 1049deltaT(t1p, t2p) 1050 struct timeval *t1p, *t2p; 1051{ 1052 double dt; 1053 1054 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1055 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1056 return (dt); 1057} 1058 1059/* 1060 * Convert an ICMP "type" field to a printable string. 1061 */ 1062char * 1063pr_type(t0) 1064 int t0; 1065{ 1066 u_char t = t0 & 0xff; 1067 char *cp; 1068 1069 switch (t) { 1070 case ICMP6_DST_UNREACH: 1071 cp = "Destination Unreachable"; 1072 break; 1073 case ICMP6_PACKET_TOO_BIG: 1074 cp = "Packet Too Big"; 1075 break; 1076 case ICMP6_TIME_EXCEEDED: 1077 cp = "Time Exceeded"; 1078 break; 1079 case ICMP6_PARAM_PROB: 1080 cp = "Parameter Problem"; 1081 break; 1082 case ICMP6_ECHO_REQUEST: 1083 cp = "Echo Request"; 1084 break; 1085 case ICMP6_ECHO_REPLY: 1086 cp = "Echo Reply"; 1087 break; 1088 case ICMP6_MEMBERSHIP_QUERY: 1089 cp = "Group Membership Query"; 1090 break; 1091 case ICMP6_MEMBERSHIP_REPORT: 1092 cp = "Group Membership Report"; 1093 break; 1094 case ICMP6_MEMBERSHIP_REDUCTION: 1095 cp = "Group Membership Reduction"; 1096 break; 1097 case ND_ROUTER_SOLICIT: 1098 cp = "Router Solicitation"; 1099 break; 1100 case ND_ROUTER_ADVERT: 1101 cp = "Router Advertisement"; 1102 break; 1103 case ND_NEIGHBOR_SOLICIT: 1104 cp = "Neighbor Solicitation"; 1105 break; 1106 case ND_NEIGHBOR_ADVERT: 1107 cp = "Neighbor Advertisement"; 1108 break; 1109 case ND_REDIRECT: 1110 cp = "Redirect"; 1111 break; 1112 default: 1113 cp = "Unknown"; 1114 break; 1115 } 1116 return cp; 1117} 1118 1119int 1120packet_ok(mhdr, cc, seq) 1121 struct msghdr *mhdr; 1122 int cc; 1123 int seq; 1124{ 1125 struct icmp6_hdr *icp; 1126 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1127 u_char type, code; 1128 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1129 struct cmsghdr *cm; 1130 int *hlimp; 1131 char hbuf[NI_MAXHOST]; 1132 1133#ifdef OLDRAWSOCKET 1134 int hlen; 1135 struct ip6_hdr *ip; 1136#endif 1137 1138#ifdef OLDRAWSOCKET 1139 ip = (struct ip6_hdr *) buf; 1140 hlen = sizeof(struct ip6_hdr); 1141 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1142 if (verbose) { 1143 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1144 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1145 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1146 printf("packet too short (%d bytes) from %s\n", cc, 1147 hbuf); 1148 } 1149 return (0); 1150 } 1151 cc -= hlen; 1152 icp = (struct icmp6_hdr *)(buf + hlen); 1153#else 1154 if (cc < sizeof(struct icmp6_hdr)) { 1155 if (verbose) { 1156 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1157 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1158 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1159 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1160 } 1161 return(0); 1162 } 1163 icp = (struct icmp6_hdr *)buf; 1164#endif 1165 /* get optional information via advanced API */ 1166 rcvpktinfo = NULL; 1167 hlimp = NULL; 1168 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1169 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1170 if (cm->cmsg_level == IPPROTO_IPV6 && 1171 cm->cmsg_type == IPV6_PKTINFO && 1172 cm->cmsg_len == 1173 CMSG_LEN(sizeof(struct in6_pktinfo))) 1174 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1175 1176 if (cm->cmsg_level == IPPROTO_IPV6 && 1177 cm->cmsg_type == IPV6_HOPLIMIT && 1178 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1179 hlimp = (int *)CMSG_DATA(cm); 1180 } 1181 if (rcvpktinfo == NULL || hlimp == NULL) { 1182 warnx("failed to get received hop limit or packet info"); 1183#if 0 1184 return(0); 1185#else 1186 rcvhlim = 0; /*XXX*/ 1187#endif 1188 } 1189 else 1190 rcvhlim = *hlimp; 1191 1192 type = icp->icmp6_type; 1193 code = icp->icmp6_code; 1194 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1195 || type == ICMP6_DST_UNREACH) { 1196 struct ip6_hdr *hip; 1197 struct udphdr *up; 1198 1199 hip = (struct ip6_hdr *)(icp + 1); 1200 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1201 if (verbose) 1202 warnx("failed to get upper layer header"); 1203 return(0); 1204 } 1205 if (useicmp && 1206 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1207 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1208 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1209 else if (!useicmp && 1210 up->uh_sport == htons(srcport) && 1211 up->uh_dport == htons(port + seq)) 1212 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1213 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1214 if (icp->icmp6_id == ident && 1215 icp->icmp6_seq == htons(seq)) 1216 return (ICMP6_DST_UNREACH_NOPORT + 1); 1217 } 1218 if (verbose) { 1219 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1220 u_int8_t *p; 1221 int i; 1222 1223 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1224 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1225 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1226 printf("\n%d bytes from %s to %s", cc, sbuf, 1227 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1228 dbuf, sizeof(dbuf)) : "?"); 1229 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1230 icp->icmp6_code); 1231 p = (u_int8_t *)(icp + 1); 1232#define WIDTH 16 1233 for (i = 0; i < cc; i++) { 1234 if (i % WIDTH == 0) 1235 printf("%04x:", i); 1236 if (i % 4 == 0) 1237 printf(" "); 1238 printf("%02x", p[i]); 1239 if (i % WIDTH == WIDTH - 1) 1240 printf("\n"); 1241 } 1242 if (cc % WIDTH != 0) 1243 printf("\n"); 1244 } 1245 return(0); 1246} 1247 1248/* 1249 * Increment pointer until find the UDP or ICMP header. 1250 */ 1251struct udphdr * 1252get_udphdr(ip6, lim) 1253 struct ip6_hdr *ip6; 1254 u_char *lim; 1255{ 1256 u_char *cp = (u_char *)ip6, nh; 1257 int hlen; 1258 1259 if (cp + sizeof(*ip6) >= lim) 1260 return(NULL); 1261 1262 nh = ip6->ip6_nxt; 1263 cp += sizeof(struct ip6_hdr); 1264 1265 while (lim - cp >= 8) { 1266 switch (nh) { 1267 case IPPROTO_ESP: 1268 case IPPROTO_TCP: 1269 return(NULL); 1270 case IPPROTO_ICMPV6: 1271 return(useicmp ? (struct udphdr *)cp : NULL); 1272 case IPPROTO_UDP: 1273 return(useicmp ? NULL : (struct udphdr *)cp); 1274 case IPPROTO_FRAGMENT: 1275 hlen = sizeof(struct ip6_frag); 1276 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1277 break; 1278 case IPPROTO_AH: 1279 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1280 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1281 break; 1282 default: 1283 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1284 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1285 break; 1286 } 1287 1288 cp += hlen; 1289 } 1290 1291 return(NULL); 1292} 1293 1294void 1295print(mhdr, cc) 1296 struct msghdr *mhdr; 1297 int cc; 1298{ 1299 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1300 char hbuf[NI_MAXHOST]; 1301 1302 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1303 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1304 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1305 if (nflag) 1306 printf(" %s", hbuf); 1307 else if (lflag) 1308 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1309 else 1310 printf(" %s", inetname((struct sockaddr *)from)); 1311 1312 if (verbose) { 1313#ifdef OLDRAWSOCKET 1314 printf(" %d bytes to %s", cc, 1315 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1316 hbuf, sizeof(hbuf)) : "?"); 1317#else 1318 printf(" %d bytes of data to %s", cc, 1319 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1320 hbuf, sizeof(hbuf)) : "?"); 1321#endif 1322 } 1323} 1324 1325/* 1326 * Construct an Internet address representation. 1327 * If the nflag has been supplied, give 1328 * numeric value, otherwise try for symbolic name. 1329 */ 1330const char * 1331inetname(sa) 1332 struct sockaddr *sa; 1333{ 1334 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1335 static int first = 1; 1336 char *cp; 1337 1338 if (first && !nflag) { 1339 first = 0; 1340 if (gethostname(domain, sizeof(domain)) == 0 && 1341 (cp = strchr(domain, '.'))) 1342 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1343 else 1344 domain[0] = 0; 1345 } 1346 cp = NULL; 1347 if (!nflag) { 1348 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1349 NI_NAMEREQD) == 0) { 1350 if ((cp = strchr(line, '.')) && 1351 !strcmp(cp + 1, domain)) 1352 *cp = 0; 1353 cp = line; 1354 } 1355 } 1356 if (cp) 1357 return cp; 1358 1359 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1360 NI_NUMERICHOST) != 0) 1361 strlcpy(line, "invalid", sizeof(line)); 1362 return line; 1363} 1364 1365void 1366usage() 1367{ 1368 1369 fprintf(stderr, 1370"usage: traceroute6 [-dIlnrv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1371" [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1372 exit(1); 1373} 1374