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 69 static 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 76 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 77 #endif 78 static const char rcsid[] = 79 "$FreeBSD$"; 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 */ 297 struct tv32 { 298 u_int32_t tv32_sec; 299 u_int32_t tv32_usec; 300 }; 301 302 struct 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__)); 308 309 u_char packet[512]; /* last inbound (icmp) packet */ 310 struct opacket *outpacket; /* last output (udp) packet */ 311 312 int main __P((int, char *[])); 313 int wait_for_reply __P((int, struct msghdr *)); 314 #ifdef IPSEC 315 #ifdef IPSEC_POLICY_IPSEC 316 int setpolicy __P((int so, char *policy)); 317 #endif 318 #endif 319 void send_probe __P((int, u_long)); 320 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 321 int get_hoplim __P((struct msghdr *)); 322 double deltaT __P((struct timeval *, struct timeval *)); 323 char *pr_type __P((int)); 324 int packet_ok __P((struct msghdr *, int, int)); 325 void print __P((struct msghdr *, int)); 326 const char *inetname __P((struct sockaddr *)); 327 void usage __P((void)); 328 329 int rcvsock; /* receive (icmp) socket file descriptor */ 330 int sndsock; /* send (udp) socket file descriptor */ 331 332 struct msghdr rcvmhdr; 333 struct iovec rcviov[2]; 334 int rcvhlim; 335 struct in6_pktinfo *rcvpktinfo; 336 337 struct sockaddr_in6 Src, Dst, Rcv; 338 u_long datalen; /* How much data */ 339 #define ICMP6ECHOLEN 8 340 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 341 char rtbuf[2064]; 342 #ifdef USE_RFC2292BIS 343 struct ip6_rthdr *rth; 344 #endif 345 struct cmsghdr *cmsg; 346 347 char *source = 0; 348 char *hostname; 349 350 u_long nprobes = 3; 351 u_long first_hop = 1; 352 u_long max_hops = 30; 353 u_int16_t srcport; 354 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 355 u_int16_t ident; 356 int options; /* socket options */ 357 int verbose; 358 int waittime = 5; /* time to wait for response (in seconds) */ 359 int nflag; /* print addresses numerically */ 360 int useicmp; 361 int lflag; /* print both numerical address & hostname */ 362 363 int 364 main(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; 376 377 /* 378 * Receive ICMP 379 */ 380 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 381 perror("socket(ICMPv6)"); 382 exit(5); 383 } 384 385 /* revoke privs */ 386 seteuid(getuid()); 387 setuid(getuid()); 388 389 size = sizeof(i); 390 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 391 max_hops = i; 392 393 /* specify to tell receiving interface */ 394 #ifdef IPV6_RECVPKTINFO 395 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 396 sizeof(on)) < 0) 397 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 398 #else /* old adv. API */ 399 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 400 sizeof(on)) < 0) 401 err(1, "setsockopt(IPV6_PKTINFO)"); 402 #endif 403 404 /* specify to tell value of hoplimit field of received IP6 hdr */ 405 #ifdef IPV6_RECVHOPLIMIT 406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 407 sizeof(on)) < 0) 408 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 409 #else /* old adv. API */ 410 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 411 sizeof(on)) < 0) 412 err(1, "setsockopt(IPV6_HOPLIMIT)"); 413 #endif 414 415 seq = 0; 416 417 while ((ch = getopt(argc, argv, "df:g:Ilm:np:q:rs:w:v")) != -1) 418 switch (ch) { 419 case 'd': 420 options |= SO_DEBUG; 421 break; 422 case 'f': 423 ep = NULL; 424 errno = 0; 425 first_hop = strtoul(optarg, &ep, 0); 426 if (errno || !*optarg || *ep || first_hop > 255) { 427 fprintf(stderr, 428 "traceroute6: invalid min hoplimit.\n"); 429 exit(1); 430 } 431 break; 432 case 'g': 433 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 434 if (hp == NULL) { 435 fprintf(stderr, 436 "traceroute6: unknown host %s\n", optarg); 437 exit(1); 438 } 439 #ifdef USE_RFC2292BIS 440 if (rth == NULL) { 441 /* 442 * XXX: We can't detect the number of 443 * intermediate nodes yet. 444 */ 445 if ((rth = inet6_rth_init((void *)rtbuf, 446 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 447 0)) == NULL) { 448 fprintf(stderr, 449 "inet6_rth_init failed.\n"); 450 exit(1); 451 } 452 } 453 if (inet6_rth_add((void *)rth, 454 (struct in6_addr *)hp->h_addr)) { 455 fprintf(stderr, 456 "inet6_rth_add failed for %s\n", 457 optarg); 458 exit(1); 459 } 460 #else /* old advanced API */ 461 if (cmsg == NULL) 462 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 463 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 464 IPV6_RTHDR_LOOSE); 465 #endif 466 freehostent(hp); 467 break; 468 case 'I': 469 useicmp++; 470 ident = htons(getpid() & 0xffff); /* same as ping6 */ 471 break; 472 case 'l': 473 lflag++; 474 break; 475 case 'm': 476 ep = NULL; 477 errno = 0; 478 max_hops = strtoul(optarg, &ep, 0); 479 if (errno || !*optarg || *ep || max_hops > 255) { 480 fprintf(stderr, 481 "traceroute6: invalid max hoplimit.\n"); 482 exit(1); 483 } 484 break; 485 case 'n': 486 nflag++; 487 break; 488 case 'p': 489 ep = NULL; 490 errno = 0; 491 lport = strtoul(optarg, &ep, 0); 492 if (errno || !*optarg || *ep) { 493 fprintf(stderr, "traceroute6: invalid port.\n"); 494 exit(1); 495 } 496 if (lport == 0 || lport != (lport & 0xffff)) { 497 fprintf(stderr, 498 "traceroute6: port out of range.\n"); 499 exit(1); 500 } 501 port = lport & 0xffff; 502 break; 503 case 'q': 504 ep = NULL; 505 errno = 0; 506 nprobes = strtoul(optarg, &ep, 0); 507 if (errno || !*optarg || *ep) { 508 fprintf(stderr, 509 "traceroute6: invalid nprobes.\n"); 510 exit(1); 511 } 512 if (nprobes < 1) { 513 fprintf(stderr, 514 "traceroute6: nprobes must be >0.\n"); 515 exit(1); 516 } 517 break; 518 case 'r': 519 options |= SO_DONTROUTE; 520 break; 521 case 's': 522 /* 523 * set the ip source address of the outbound 524 * probe (e.g., on a multi-homed host). 525 */ 526 source = optarg; 527 break; 528 case 'v': 529 verbose++; 530 break; 531 case 'w': 532 ep = NULL; 533 errno = 0; 534 waittime = strtoul(optarg, &ep, 0); 535 if (errno || !*optarg || *ep) { 536 fprintf(stderr, 537 "traceroute6: invalid wait time.\n"); 538 exit(1); 539 } 540 if (waittime <= 1) { 541 fprintf(stderr, 542 "traceroute6: wait must be >1 sec.\n"); 543 exit(1); 544 } 545 break; 546 default: 547 usage(); 548 } 549 argc -= optind; 550 argv += optind; 551 552 if (max_hops < first_hop) { 553 fprintf(stderr, 554 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 555 exit(1); 556 } 557 558 if (argc < 1 || argc > 2) 559 usage(); 560 561 #if 1 562 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 563 #else 564 setlinebuf(stdout); 565 #endif 566 567 memset(&hints, 0, sizeof(hints)); 568 hints.ai_family = PF_INET6; 569 hints.ai_socktype = SOCK_RAW; 570 hints.ai_protocol = IPPROTO_ICMPV6; 571 hints.ai_flags = AI_CANONNAME; 572 error = getaddrinfo(*argv, NULL, &hints, &res); 573 if (error) { 574 fprintf(stderr, 575 "traceroute6: %s\n", gai_strerror(error)); 576 exit(1); 577 } 578 if (res->ai_addrlen != sizeof(Dst)) { 579 fprintf(stderr, 580 "traceroute6: size of sockaddr mismatch\n"); 581 exit(1); 582 } 583 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 584 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 585 if (!hostname) { 586 fprintf(stderr, "traceroute6: not enough core\n"); 587 exit(1); 588 } 589 if (res->ai_next) { 590 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 591 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 592 strlcpy(hbuf, "?", sizeof(hbuf)); 593 fprintf(stderr, "traceroute6: Warning: %s has multiple " 594 "addresses; using %s\n", hostname, hbuf); 595 } 596 597 if (*++argv) { 598 ep = NULL; 599 errno = 0; 600 datalen = strtoul(*argv, &ep, 0); 601 if (errno || !*argv || *ep) { 602 fprintf(stderr, 603 "traceroute6: invalid packet length.\n"); 604 exit(1); 605 } 606 } 607 if (useicmp) 608 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 609 else 610 minlen = sizeof(struct opacket); 611 if (datalen < minlen) 612 datalen = minlen; 613 else if (datalen >= MAXPACKET) { 614 fprintf(stderr, 615 "traceroute6: packet size must be %d <= s < %ld.\n", 616 minlen, (long)MAXPACKET); 617 exit(1); 618 } 619 outpacket = (struct opacket *)malloc((unsigned)datalen); 620 if (!outpacket) { 621 perror("malloc"); 622 exit(1); 623 } 624 (void) bzero((char *)outpacket, datalen); 625 626 /* initialize msghdr for receiving packets */ 627 rcviov[0].iov_base = (caddr_t)packet; 628 rcviov[0].iov_len = sizeof(packet); 629 rcvmhdr.msg_name = (caddr_t)&Rcv; 630 rcvmhdr.msg_namelen = sizeof(Rcv); 631 rcvmhdr.msg_iov = rcviov; 632 rcvmhdr.msg_iovlen = 1; 633 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 634 CMSG_SPACE(sizeof(int)); 635 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 636 fprintf(stderr, "traceroute6: malloc failed\n"); 637 exit(1); 638 } 639 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 640 rcvmhdr.msg_controllen = rcvcmsglen; 641 642 if (options & SO_DEBUG) 643 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 644 (char *)&on, sizeof(on)); 645 if (options & SO_DONTROUTE) 646 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 647 (char *)&on, sizeof(on)); 648 #ifdef IPSEC 649 #ifdef IPSEC_POLICY_IPSEC 650 /* 651 * do not raise error even if setsockopt fails, kernel may have ipsec 652 * turned off. 653 */ 654 if (setpolicy(rcvsock, "in bypass") < 0) 655 errx(1, "%s", ipsec_strerror()); 656 if (setpolicy(rcvsock, "out bypass") < 0) 657 errx(1, "%s", ipsec_strerror()); 658 #else 659 { 660 int level = IPSEC_LEVEL_NONE; 661 662 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 663 sizeof(level)); 664 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 665 sizeof(level)); 666 #ifdef IP_AUTH_TRANS_LEVEL 667 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 668 sizeof(level)); 669 #else 670 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 671 sizeof(level)); 672 #endif 673 #ifdef IP_AUTH_NETWORK_LEVEL 674 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 675 sizeof(level)); 676 #endif 677 } 678 #endif /*IPSEC_POLICY_IPSEC*/ 679 #endif /*IPSEC*/ 680 681 /* 682 * Send UDP or ICMP 683 */ 684 if (useicmp) { 685 sndsock = rcvsock; 686 } else { 687 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 688 perror("socket(SOCK_DGRAM)"); 689 exit(5); 690 } 691 } 692 #ifdef SO_SNDBUF 693 i = datalen; 694 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 695 sizeof(i)) < 0) { 696 perror("setsockopt(SO_SNDBUF)"); 697 exit(6); 698 } 699 #endif /* SO_SNDBUF */ 700 if (options & SO_DEBUG) 701 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 702 (char *)&on, sizeof(on)); 703 if (options & SO_DONTROUTE) 704 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 705 (char *)&on, sizeof(on)); 706 #ifdef USE_RFC2292BIS 707 if (rth) {/* XXX: there is no library to finalize the header... */ 708 rth->ip6r_len = rth->ip6r_segleft * 2; 709 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 710 (void *)rth, (rth->ip6r_len + 1) << 3)) { 711 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 712 strerror(errno)); 713 exit(1); 714 } 715 } 716 #else /* old advanced API */ 717 if (cmsg != NULL) { 718 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 719 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 720 rtbuf, cmsg->cmsg_len) < 0) { 721 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 722 strerror(errno)); 723 exit(1); 724 } 725 } 726 #endif /* USE_RFC2292BIS */ 727 #ifdef IPSEC 728 #ifdef IPSEC_POLICY_IPSEC 729 /* 730 * do not raise error even if setsockopt fails, kernel may have ipsec 731 * turned off. 732 */ 733 if (setpolicy(sndsock, "in bypass") < 0) 734 errx(1, "%s", ipsec_strerror()); 735 if (setpolicy(sndsock, "out bypass") < 0) 736 errx(1, "%s", ipsec_strerror()); 737 #else 738 { 739 int level = IPSEC_LEVEL_BYPASS; 740 741 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 742 sizeof(level)); 743 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 744 sizeof(level)); 745 #ifdef IP_AUTH_TRANS_LEVEL 746 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 747 sizeof(level)); 748 #else 749 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 750 sizeof(level)); 751 #endif 752 #ifdef IP_AUTH_NETWORK_LEVEL 753 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 754 sizeof(level)); 755 #endif 756 } 757 #endif /*IPSEC_POLICY_IPSEC*/ 758 #endif /*IPSEC*/ 759 760 /* 761 * Source selection 762 */ 763 bzero(&Src, sizeof(Src)); 764 if (source) { 765 struct addrinfo hints, *res; 766 int error; 767 768 memset(&hints, 0, sizeof(hints)); 769 hints.ai_family = AF_INET6; 770 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 771 hints.ai_flags = AI_NUMERICHOST; 772 error = getaddrinfo(source, "0", &hints, &res); 773 if (error) { 774 printf("traceroute6: %s: %s\n", source, 775 gai_strerror(error)); 776 exit(1); 777 } 778 if (res->ai_addrlen > sizeof(Src)) { 779 printf("traceroute6: %s: %s\n", source, 780 gai_strerror(error)); 781 exit(1); 782 } 783 memcpy(&Src, res->ai_addr, res->ai_addrlen); 784 freeaddrinfo(res); 785 } else { 786 struct sockaddr_in6 Nxt; 787 int dummy; 788 socklen_t len; 789 790 Nxt = Dst; 791 Nxt.sin6_port = htons(DUMMY_PORT); 792 if (cmsg != NULL) 793 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 794 sizeof(Nxt.sin6_addr)); 795 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 796 perror("socket"); 797 exit(1); 798 } 799 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 800 perror("connect"); 801 exit(1); 802 } 803 len = sizeof(Src); 804 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 805 perror("getsockname"); 806 exit(1); 807 } 808 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 809 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 810 fprintf(stderr, "getnameinfo failed for source\n"); 811 exit(1); 812 } 813 source = src0; 814 close(dummy); 815 } 816 817 Src.sin6_port = htons(0); 818 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 819 perror("bind"); 820 exit(1); 821 } 822 823 { 824 socklen_t len; 825 826 len = sizeof(Src); 827 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 828 perror("getsockname"); 829 exit(1); 830 } 831 srcport = ntohs(Src.sin6_port); 832 } 833 834 /* 835 * Message to users 836 */ 837 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 838 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 839 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 840 fprintf(stderr, "traceroute6"); 841 fprintf(stderr, " to %s (%s)", hostname, hbuf); 842 if (source) 843 fprintf(stderr, " from %s", source); 844 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 845 max_hops, datalen); 846 (void) fflush(stderr); 847 848 if (first_hop > 1) 849 printf("Skipping %lu intermediate hops\n", first_hop - 1); 850 851 /* 852 * Main loop 853 */ 854 for (hops = first_hop; hops <= max_hops; ++hops) { 855 struct in6_addr lastaddr; 856 int got_there = 0; 857 int unreachable = 0; 858 859 printf("%2lu ", hops); 860 bzero(&lastaddr, sizeof(lastaddr)); 861 for (probe = 0; probe < nprobes; ++probe) { 862 int cc; 863 struct timeval t1, t2; 864 865 (void) gettimeofday(&t1, NULL); 866 send_probe(++seq, hops); 867 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 868 (void) gettimeofday(&t2, NULL); 869 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 870 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 871 &lastaddr)) { 872 print(&rcvmhdr, cc); 873 lastaddr = Rcv.sin6_addr; 874 } 875 printf(" %.3f ms", deltaT(&t1, &t2)); 876 switch (i - 1) { 877 case ICMP6_DST_UNREACH_NOROUTE: 878 ++unreachable; 879 printf(" !N"); 880 break; 881 case ICMP6_DST_UNREACH_ADMIN: 882 ++unreachable; 883 printf(" !P"); 884 break; 885 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 886 ++unreachable; 887 printf(" !S"); 888 break; 889 case ICMP6_DST_UNREACH_ADDR: 890 ++unreachable; 891 printf(" !A"); 892 break; 893 case ICMP6_DST_UNREACH_NOPORT: 894 if (rcvhlim >= 0 && 895 rcvhlim <= 1) 896 printf(" !"); 897 ++got_there; 898 break; 899 } 900 break; 901 } 902 } 903 if (cc == 0) 904 printf(" *"); 905 (void) fflush(stdout); 906 } 907 putchar('\n'); 908 if (got_there || 909 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 910 exit(0); 911 } 912 } 913 914 exit(0); 915 } 916 917 int 918 wait_for_reply(sock, mhdr) 919 int sock; 920 struct msghdr *mhdr; 921 { 922 #ifdef HAVE_POLL 923 struct pollfd pfd[1]; 924 int cc = 0; 925 926 pfd[0].fd = sock; 927 pfd[0].events = POLLIN; 928 pfd[0].revents = 0; 929 930 if (poll(pfd, 1, waittime * 1000) > 0) 931 cc = recvmsg(rcvsock, mhdr, 0); 932 933 return(cc); 934 #else 935 fd_set *fdsp; 936 struct timeval wait; 937 int cc = 0, fdsn; 938 939 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 940 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 941 err(1, "malloc"); 942 memset(fdsp, 0, fdsn); 943 FD_SET(sock, fdsp); 944 wait.tv_sec = waittime; wait.tv_usec = 0; 945 946 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 947 cc = recvmsg(rcvsock, mhdr, 0); 948 949 free(fdsp); 950 return(cc); 951 #endif 952 } 953 954 #ifdef IPSEC 955 #ifdef IPSEC_POLICY_IPSEC 956 int 957 setpolicy(so, policy) 958 int so; 959 char *policy; 960 { 961 char *buf; 962 963 buf = ipsec_set_policy(policy, strlen(policy)); 964 if (buf == NULL) { 965 warnx("%s", ipsec_strerror()); 966 return -1; 967 } 968 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 969 buf, ipsec_get_policylen(buf)); 970 971 free(buf); 972 973 return 0; 974 } 975 #endif 976 #endif 977 978 void 979 send_probe(seq, hops) 980 int seq; 981 u_long hops; 982 { 983 struct timeval tv; 984 struct tv32 tv32; 985 int i; 986 987 i = hops; 988 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 989 (char *)&i, sizeof(i)) < 0) { 990 perror("setsockopt IPV6_UNICAST_HOPS"); 991 } 992 993 Dst.sin6_port = htons(port + seq); 994 (void) gettimeofday(&tv, NULL); 995 tv32.tv32_sec = htonl(tv.tv_sec); 996 tv32.tv32_usec = htonl(tv.tv_usec); 997 998 if (useicmp) { 999 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 1000 1001 icp->icmp6_type = ICMP6_ECHO_REQUEST; 1002 icp->icmp6_code = 0; 1003 icp->icmp6_cksum = 0; 1004 icp->icmp6_id = ident; 1005 icp->icmp6_seq = htons(seq); 1006 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 1007 sizeof(tv32)); 1008 } else { 1009 struct opacket *op = outpacket; 1010 1011 op->seq = seq; 1012 op->hops = hops; 1013 bcopy(&tv32, &op->tv, sizeof tv32); 1014 } 1015 1016 i = sendto(sndsock, (char *)outpacket, datalen, 0, 1017 (struct sockaddr *)&Dst, Dst.sin6_len); 1018 if (i < 0 || i != datalen) { 1019 if (i < 0) 1020 perror("sendto"); 1021 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 1022 hostname, datalen, i); 1023 (void) fflush(stdout); 1024 } 1025 } 1026 1027 int 1028 get_hoplim(mhdr) 1029 struct msghdr *mhdr; 1030 { 1031 struct cmsghdr *cm; 1032 1033 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1034 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1035 if (cm->cmsg_level == IPPROTO_IPV6 && 1036 cm->cmsg_type == IPV6_HOPLIMIT && 1037 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1038 return(*(int *)CMSG_DATA(cm)); 1039 } 1040 1041 return(-1); 1042 } 1043 1044 double 1045 deltaT(t1p, t2p) 1046 struct timeval *t1p, *t2p; 1047 { 1048 double dt; 1049 1050 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1051 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1052 return (dt); 1053 } 1054 1055 /* 1056 * Convert an ICMP "type" field to a printable string. 1057 */ 1058 char * 1059 pr_type(t0) 1060 int t0; 1061 { 1062 u_char t = t0 & 0xff; 1063 char *cp; 1064 1065 switch (t) { 1066 case ICMP6_DST_UNREACH: 1067 cp = "Destination Unreachable"; 1068 break; 1069 case ICMP6_PACKET_TOO_BIG: 1070 cp = "Packet Too Big"; 1071 break; 1072 case ICMP6_TIME_EXCEEDED: 1073 cp = "Time Exceeded"; 1074 break; 1075 case ICMP6_PARAM_PROB: 1076 cp = "Parameter Problem"; 1077 break; 1078 case ICMP6_ECHO_REQUEST: 1079 cp = "Echo Request"; 1080 break; 1081 case ICMP6_ECHO_REPLY: 1082 cp = "Echo Reply"; 1083 break; 1084 case ICMP6_MEMBERSHIP_QUERY: 1085 cp = "Group Membership Query"; 1086 break; 1087 case ICMP6_MEMBERSHIP_REPORT: 1088 cp = "Group Membership Report"; 1089 break; 1090 case ICMP6_MEMBERSHIP_REDUCTION: 1091 cp = "Group Membership Reduction"; 1092 break; 1093 case ND_ROUTER_SOLICIT: 1094 cp = "Router Solicitation"; 1095 break; 1096 case ND_ROUTER_ADVERT: 1097 cp = "Router Advertisement"; 1098 break; 1099 case ND_NEIGHBOR_SOLICIT: 1100 cp = "Neighbor Solicitation"; 1101 break; 1102 case ND_NEIGHBOR_ADVERT: 1103 cp = "Neighbor Advertisement"; 1104 break; 1105 case ND_REDIRECT: 1106 cp = "Redirect"; 1107 break; 1108 default: 1109 cp = "Unknown"; 1110 break; 1111 } 1112 return cp; 1113 } 1114 1115 int 1116 packet_ok(mhdr, cc, seq) 1117 struct msghdr *mhdr; 1118 int cc; 1119 int seq; 1120 { 1121 struct icmp6_hdr *icp; 1122 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1123 u_char type, code; 1124 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1125 struct cmsghdr *cm; 1126 int *hlimp; 1127 char hbuf[NI_MAXHOST]; 1128 1129 #ifdef OLDRAWSOCKET 1130 int hlen; 1131 struct ip6_hdr *ip; 1132 #endif 1133 1134 #ifdef OLDRAWSOCKET 1135 ip = (struct ip6_hdr *) buf; 1136 hlen = sizeof(struct ip6_hdr); 1137 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1138 if (verbose) { 1139 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1140 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1141 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1142 printf("packet too short (%d bytes) from %s\n", cc, 1143 hbuf); 1144 } 1145 return (0); 1146 } 1147 cc -= hlen; 1148 icp = (struct icmp6_hdr *)(buf + hlen); 1149 #else 1150 if (cc < sizeof(struct icmp6_hdr)) { 1151 if (verbose) { 1152 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1153 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1154 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1155 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1156 } 1157 return(0); 1158 } 1159 icp = (struct icmp6_hdr *)buf; 1160 #endif 1161 /* get optional information via advanced API */ 1162 rcvpktinfo = NULL; 1163 hlimp = NULL; 1164 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1165 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1166 if (cm->cmsg_level == IPPROTO_IPV6 && 1167 cm->cmsg_type == IPV6_PKTINFO && 1168 cm->cmsg_len == 1169 CMSG_LEN(sizeof(struct in6_pktinfo))) 1170 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1171 1172 if (cm->cmsg_level == IPPROTO_IPV6 && 1173 cm->cmsg_type == IPV6_HOPLIMIT && 1174 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1175 hlimp = (int *)CMSG_DATA(cm); 1176 } 1177 if (rcvpktinfo == NULL || hlimp == NULL) { 1178 warnx("failed to get received hop limit or packet info"); 1179 #if 0 1180 return(0); 1181 #else 1182 rcvhlim = 0; /*XXX*/ 1183 #endif 1184 } 1185 else 1186 rcvhlim = *hlimp; 1187 1188 type = icp->icmp6_type; 1189 code = icp->icmp6_code; 1190 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1191 || type == ICMP6_DST_UNREACH) { 1192 struct ip6_hdr *hip; 1193 struct udphdr *up; 1194 1195 hip = (struct ip6_hdr *)(icp + 1); 1196 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1197 if (verbose) 1198 warnx("failed to get upper layer header"); 1199 return(0); 1200 } 1201 if (useicmp && 1202 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1203 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1204 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1205 else if (!useicmp && 1206 up->uh_sport == htons(srcport) && 1207 up->uh_dport == htons(port + seq)) 1208 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1209 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1210 if (icp->icmp6_id == ident && 1211 icp->icmp6_seq == htons(seq)) 1212 return (ICMP6_DST_UNREACH_NOPORT + 1); 1213 } 1214 if (verbose) { 1215 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1216 u_int8_t *p; 1217 int i; 1218 1219 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1220 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1221 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1222 printf("\n%d bytes from %s to %s", cc, sbuf, 1223 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1224 dbuf, sizeof(dbuf)) : "?"); 1225 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1226 icp->icmp6_code); 1227 p = (u_int8_t *)(icp + 1); 1228 #define WIDTH 16 1229 for (i = 0; i < cc; i++) { 1230 if (i % WIDTH == 0) 1231 printf("%04x:", i); 1232 if (i % 4 == 0) 1233 printf(" "); 1234 printf("%02x", p[i]); 1235 if (i % WIDTH == WIDTH - 1) 1236 printf("\n"); 1237 } 1238 if (cc % WIDTH != 0) 1239 printf("\n"); 1240 } 1241 return(0); 1242 } 1243 1244 /* 1245 * Increment pointer until find the UDP or ICMP header. 1246 */ 1247 struct udphdr * 1248 get_udphdr(ip6, lim) 1249 struct ip6_hdr *ip6; 1250 u_char *lim; 1251 { 1252 u_char *cp = (u_char *)ip6, nh; 1253 int hlen; 1254 1255 if (cp + sizeof(*ip6) >= lim) 1256 return(NULL); 1257 1258 nh = ip6->ip6_nxt; 1259 cp += sizeof(struct ip6_hdr); 1260 1261 while (lim - cp >= 8) { 1262 switch (nh) { 1263 case IPPROTO_ESP: 1264 case IPPROTO_TCP: 1265 return(NULL); 1266 case IPPROTO_ICMPV6: 1267 return(useicmp ? (struct udphdr *)cp : NULL); 1268 case IPPROTO_UDP: 1269 return(useicmp ? NULL : (struct udphdr *)cp); 1270 case IPPROTO_FRAGMENT: 1271 hlen = sizeof(struct ip6_frag); 1272 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1273 break; 1274 case IPPROTO_AH: 1275 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1276 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1277 break; 1278 default: 1279 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1280 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1281 break; 1282 } 1283 1284 cp += hlen; 1285 } 1286 1287 return(NULL); 1288 } 1289 1290 void 1291 print(mhdr, cc) 1292 struct msghdr *mhdr; 1293 int cc; 1294 { 1295 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1296 char hbuf[NI_MAXHOST]; 1297 1298 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1299 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1300 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1301 if (nflag) 1302 printf(" %s", hbuf); 1303 else if (lflag) 1304 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1305 else 1306 printf(" %s", inetname((struct sockaddr *)from)); 1307 1308 if (verbose) { 1309 #ifdef OLDRAWSOCKET 1310 printf(" %d bytes to %s", cc, 1311 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1312 hbuf, sizeof(hbuf)) : "?"); 1313 #else 1314 printf(" %d bytes of data to %s", cc, 1315 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1316 hbuf, sizeof(hbuf)) : "?"); 1317 #endif 1318 } 1319 } 1320 1321 /* 1322 * Construct an Internet address representation. 1323 * If the nflag has been supplied, give 1324 * numeric value, otherwise try for symbolic name. 1325 */ 1326 const char * 1327 inetname(sa) 1328 struct sockaddr *sa; 1329 { 1330 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1331 static int first = 1; 1332 char *cp; 1333 1334 if (first && !nflag) { 1335 first = 0; 1336 if (gethostname(domain, sizeof(domain)) == 0 && 1337 (cp = strchr(domain, '.'))) 1338 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1339 else 1340 domain[0] = 0; 1341 } 1342 cp = NULL; 1343 if (!nflag) { 1344 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1345 NI_NAMEREQD) == 0) { 1346 if ((cp = strchr(line, '.')) && 1347 !strcmp(cp + 1, domain)) 1348 *cp = 0; 1349 cp = line; 1350 } 1351 } 1352 if (cp) 1353 return cp; 1354 1355 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1356 NI_NUMERICHOST) != 0) 1357 strlcpy(line, "invalid", sizeof(line)); 1358 return line; 1359 } 1360 1361 void 1362 usage() 1363 { 1364 1365 fprintf(stderr, 1366 "usage: traceroute6 [-dIlnrv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1367 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1368 exit(1); 1369 } 1370