traceroute6.c revision 1.38
1 /* $NetBSD: traceroute6.c,v 1.38 2009/02/16 20:36:11 is Exp $ */ 2 /* $KAME: traceroute6.c,v 1.67 2004/01/25 03:24:39 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Van Jacobson. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 #if 0 66 #ifndef lint 67 static char copyright[] = 68 "@(#) Copyright (c) 1990, 1993\n\ 69 The Regents of the University of California. All rights reserved.\n"; 70 #endif /* not lint */ 71 72 #ifndef lint 73 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 74 #endif /* not lint */ 75 #else 76 #include <sys/cdefs.h> 77 #ifndef lint 78 __RCSID("$NetBSD: traceroute6.c,v 1.38 2009/02/16 20:36:11 is Exp $"); 79 #endif 80 #endif 81 82 /* 83 * traceroute host - trace the route ip packets follow going to "host". 84 * 85 * Attempt to trace the route an ip packet would follow to some 86 * internet host. We find out intermediate hops by launching probe 87 * packets with a small ttl (time to live) then listening for an 88 * icmp "time exceeded" reply from a gateway. We start our probes 89 * with a ttl of one and increase by one until we get an icmp "port 90 * unreachable" (which means we got to "host") or hit a max (which 91 * defaults to 30 hops & can be changed with the -m flag). Three 92 * probes (change with -q flag) are sent at each ttl setting and a 93 * line is printed showing the ttl, address of the gateway and 94 * round trip time of each probe. If the probe answers come from 95 * different gateways, the address of each responding system will 96 * be printed. If there is no response within a 5 sec. timeout 97 * interval (changed with the -w flag), a "*" is printed for that 98 * probe. 99 * 100 * Probe packets are UDP format. We don't want the destination 101 * host to process them so the destination port is set to an 102 * unlikely value (if some clod on the destination is using that 103 * value, it can be changed with the -p flag). 104 * 105 * A sample use might be: 106 * 107 * [yak 71]% traceroute nis.nsf.net. 108 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 109 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 110 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 111 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 112 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 113 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 114 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 115 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 116 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 117 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 118 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 119 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 120 * 121 * Note that lines 2 & 3 are the same. This is due to a buggy 122 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 123 * packets with a zero ttl. 124 * 125 * A more interesting example is: 126 * 127 * [yak 72]% traceroute allspice.lcs.mit.edu. 128 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 129 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 130 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 131 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 132 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 133 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 134 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 135 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 136 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 137 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 138 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 139 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 140 * 12 * * * 141 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 142 * 14 * * * 143 * 15 * * * 144 * 16 * * * 145 * 17 * * * 146 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 147 * 148 * (I start to see why I'm having so much trouble with mail to 149 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 150 * either don't send ICMP "time exceeded" messages or send them 151 * with a ttl too small to reach us. 14 - 17 are running the 152 * MIT C Gateway code that doesn't send "time exceeded"s. God 153 * only knows what's going on with 12. 154 * 155 * The silent gateway 12 in the above may be the result of a bug in 156 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 157 * sends an unreachable message using whatever ttl remains in the 158 * original datagram. Since, for gateways, the remaining ttl is 159 * zero, the icmp "time exceeded" is guaranteed to not make it back 160 * to us. The behavior of this bug is slightly more interesting 161 * when it appears on the destination system: 162 * 163 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 164 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 165 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 166 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 167 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 168 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 169 * 7 * * * 170 * 8 * * * 171 * 9 * * * 172 * 10 * * * 173 * 11 * * * 174 * 12 * * * 175 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 176 * 177 * Notice that there are 12 "gateways" (13 is the final 178 * destination) and exactly the last half of them are "missing". 179 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 180 * is using the ttl from our arriving datagram as the ttl in its 181 * icmp reply. So, the reply will time out on the return path 182 * (with no notice sent to anyone since icmp's aren't sent for 183 * icmp's) until we probe with a ttl that's at least twice the path 184 * length. I.e., rip is really only 7 hops away. A reply that 185 * returns with a ttl of 1 is a clue this problem exists. 186 * Traceroute prints a "!" after the time if the ttl is <= 1. 187 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 188 * non-standard (HPUX) software, expect to see this problem 189 * frequently and/or take care picking the target host of your 190 * probes. 191 * 192 * Other possible annotations after the time are !H, !N, !P (got a host, 193 * network or protocol unreachable, respectively), !S or !F (source 194 * route failed or fragmentation needed -- neither of these should 195 * ever occur and the associated gateway is busted if you see one). If 196 * almost all the probes result in some kind of unreachable, traceroute 197 * will give up and exit. 198 * 199 * Notes 200 * ----- 201 * This program must be run by root or be setuid. (I suggest that 202 * you *don't* make it setuid -- casual use could result in a lot 203 * of unnecessary traffic on our poor, congested nets.) 204 * 205 * This program requires a kernel mod that does not appear in any 206 * system available from Berkeley: A raw ip socket using proto 207 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 208 * opposed to data to be wrapped in a ip datagram). See the README 209 * file that came with the source to this program for a description 210 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 211 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 212 * MODIFIED TO RUN THIS PROGRAM. 213 * 214 * The udp port usage may appear bizarre (well, ok, it is bizarre). 215 * The problem is that an icmp message only contains 8 bytes of 216 * data from the original datagram. 8 bytes is the size of a udp 217 * header so, if we want to associate replies with the original 218 * datagram, the necessary information must be encoded into the 219 * udp header (the ip id could be used but there's no way to 220 * interlock with the kernel's assignment of ip id's and, anyway, 221 * it would have taken a lot more kernel hacking to allow this 222 * code to set the ip id). So, to allow two or more users to 223 * use traceroute simultaneously, we use this task's pid as the 224 * source port (the high bit is set to move the port number out 225 * of the "likely" range). To keep track of which probe is being 226 * replied to (so times and/or hop counts don't get confused by a 227 * reply that was delayed in transit), we increment the destination 228 * port number before each probe. 229 * 230 * Don't use this as a coding example. I was trying to find a 231 * routing problem and this code sort-of popped out after 48 hours 232 * without sleep. I was amazed it ever compiled, much less ran. 233 * 234 * I stole the idea for this program from Steve Deering. Since 235 * the first release, I've learned that had I attended the right 236 * IETF working group meetings, I also could have stolen it from Guy 237 * Almes or Matt Mathis. I don't know (or care) who came up with 238 * the idea first. I envy the originators' perspicacity and I'm 239 * glad they didn't keep the idea a secret. 240 * 241 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 242 * enhancements to the original distribution. 243 * 244 * I've hacked up a round-trip-route version of this that works by 245 * sending a loose-source-routed udp datagram through the destination 246 * back to yourself. Unfortunately, SO many gateways botch source 247 * routing, the thing is almost worthless. Maybe one day... 248 * 249 * -- Van Jacobson (van (at) 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 } __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_RFC3542 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_RFC3542 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 /* same as ping6 */ 471 ident = htons(arc4random() & 0xffff); 472 break; 473 case 'l': 474 lflag++; 475 break; 476 case 'm': 477 ep = NULL; 478 errno = 0; 479 max_hops = strtoul(optarg, &ep, 0); 480 if (errno || !*optarg || *ep || max_hops > 255) { 481 fprintf(stderr, 482 "traceroute6: invalid max hoplimit.\n"); 483 exit(1); 484 } 485 break; 486 case 'n': 487 nflag++; 488 break; 489 case 'p': 490 ep = NULL; 491 errno = 0; 492 lport = strtoul(optarg, &ep, 0); 493 if (errno || !*optarg || *ep) { 494 fprintf(stderr, "traceroute6: invalid port.\n"); 495 exit(1); 496 } 497 if (lport == 0 || lport != (lport & 0xffff)) { 498 fprintf(stderr, 499 "traceroute6: port out of range.\n"); 500 exit(1); 501 } 502 port = lport & 0xffff; 503 break; 504 case 'q': 505 ep = NULL; 506 errno = 0; 507 nprobes = strtoul(optarg, &ep, 0); 508 if (errno || !*optarg || *ep) { 509 fprintf(stderr, 510 "traceroute6: invalid nprobes.\n"); 511 exit(1); 512 } 513 if (nprobes < 1) { 514 fprintf(stderr, 515 "traceroute6: nprobes must be >0.\n"); 516 exit(1); 517 } 518 break; 519 case 'r': 520 options |= SO_DONTROUTE; 521 break; 522 case 's': 523 /* 524 * set the ip source address of the outbound 525 * probe (e.g., on a multi-homed host). 526 */ 527 source = optarg; 528 break; 529 case 'v': 530 verbose++; 531 break; 532 case 'w': 533 ep = NULL; 534 errno = 0; 535 waittime = strtoul(optarg, &ep, 0); 536 if (errno || !*optarg || *ep) { 537 fprintf(stderr, 538 "traceroute6: invalid wait time.\n"); 539 exit(1); 540 } 541 if (waittime <= 1) { 542 fprintf(stderr, 543 "traceroute6: wait must be >1 sec.\n"); 544 exit(1); 545 } 546 break; 547 default: 548 usage(); 549 } 550 argc -= optind; 551 argv += optind; 552 553 if (max_hops < first_hop) { 554 fprintf(stderr, 555 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 556 exit(1); 557 } 558 559 if (argc < 1 || argc > 2) 560 usage(); 561 562 #if 1 563 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 564 #else 565 setlinebuf(stdout); 566 #endif 567 568 memset(&hints, 0, sizeof(hints)); 569 hints.ai_family = PF_INET6; 570 hints.ai_socktype = SOCK_RAW; 571 hints.ai_protocol = IPPROTO_ICMPV6; 572 hints.ai_flags = AI_CANONNAME; 573 error = getaddrinfo(*argv, NULL, &hints, &res); 574 if (error) { 575 fprintf(stderr, 576 "traceroute6: %s\n", gai_strerror(error)); 577 exit(1); 578 } 579 if (res->ai_addrlen != sizeof(Dst)) { 580 fprintf(stderr, 581 "traceroute6: size of sockaddr mismatch\n"); 582 exit(1); 583 } 584 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 585 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 586 if (!hostname) { 587 fprintf(stderr, "traceroute6: not enough core\n"); 588 exit(1); 589 } 590 if (res->ai_next) { 591 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 592 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 593 strlcpy(hbuf, "?", sizeof(hbuf)); 594 fprintf(stderr, "traceroute6: Warning: %s has multiple " 595 "addresses; using %s\n", hostname, hbuf); 596 } 597 598 if (*++argv) { 599 ep = NULL; 600 errno = 0; 601 datalen = strtoul(*argv, &ep, 0); 602 if (errno || !*argv || *ep) { 603 fprintf(stderr, 604 "traceroute6: invalid packet length.\n"); 605 exit(1); 606 } 607 } 608 if (useicmp) 609 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 610 else 611 minlen = sizeof(struct opacket); 612 if (datalen < minlen) 613 datalen = minlen; 614 else if (datalen >= MAXPACKET) { 615 fprintf(stderr, 616 "traceroute6: packet size must be %d <= s < %ld.\n", 617 minlen, (long)MAXPACKET); 618 exit(1); 619 } 620 outpacket = (struct opacket *)malloc((unsigned)datalen); 621 if (!outpacket) { 622 perror("malloc"); 623 exit(1); 624 } 625 (void) bzero((char *)outpacket, datalen); 626 627 /* initialize msghdr for receiving packets */ 628 rcviov[0].iov_base = (caddr_t)packet; 629 rcviov[0].iov_len = sizeof(packet); 630 rcvmhdr.msg_name = (caddr_t)&Rcv; 631 rcvmhdr.msg_namelen = sizeof(Rcv); 632 rcvmhdr.msg_iov = rcviov; 633 rcvmhdr.msg_iovlen = 1; 634 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 635 CMSG_SPACE(sizeof(int)); 636 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 637 fprintf(stderr, "traceroute6: malloc failed\n"); 638 exit(1); 639 } 640 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 641 rcvmhdr.msg_controllen = rcvcmsglen; 642 643 if (options & SO_DEBUG) 644 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 645 (char *)&on, sizeof(on)); 646 if (options & SO_DONTROUTE) 647 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 648 (char *)&on, sizeof(on)); 649 #ifdef IPSEC 650 #ifdef IPSEC_POLICY_IPSEC 651 /* 652 * do not raise error even if setsockopt fails, kernel may have ipsec 653 * turned off. 654 */ 655 if (setpolicy(rcvsock, "in bypass") < 0) 656 errx(1, "%s", ipsec_strerror()); 657 if (setpolicy(rcvsock, "out bypass") < 0) 658 errx(1, "%s", ipsec_strerror()); 659 #else 660 { 661 int level = IPSEC_LEVEL_NONE; 662 663 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 664 sizeof(level)); 665 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 666 sizeof(level)); 667 #ifdef IP_AUTH_TRANS_LEVEL 668 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 669 sizeof(level)); 670 #else 671 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 672 sizeof(level)); 673 #endif 674 #ifdef IP_AUTH_NETWORK_LEVEL 675 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 676 sizeof(level)); 677 #endif 678 } 679 #endif /*IPSEC_POLICY_IPSEC*/ 680 #endif /*IPSEC*/ 681 682 /* 683 * Send UDP or ICMP 684 */ 685 if (useicmp) { 686 sndsock = rcvsock; 687 } else { 688 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 689 perror("socket(SOCK_DGRAM)"); 690 exit(5); 691 } 692 } 693 #ifdef SO_SNDBUF 694 i = datalen; 695 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 696 sizeof(i)) < 0) { 697 perror("setsockopt(SO_SNDBUF)"); 698 exit(6); 699 } 700 #endif /* SO_SNDBUF */ 701 if (options & SO_DEBUG) 702 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 703 (char *)&on, sizeof(on)); 704 if (options & SO_DONTROUTE) 705 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 706 (char *)&on, sizeof(on)); 707 #ifdef USE_RFC3542 708 if (rth) {/* XXX: there is no library to finalize the header... */ 709 rth->ip6r_len = rth->ip6r_segleft * 2; 710 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 711 (void *)rth, (rth->ip6r_len + 1) << 3)) { 712 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 713 strerror(errno)); 714 exit(1); 715 } 716 } 717 #else /* old advanced API */ 718 if (cmsg != NULL) { 719 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 720 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 721 rtbuf, cmsg->cmsg_len) < 0) { 722 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 723 strerror(errno)); 724 exit(1); 725 } 726 } 727 #endif /* USE_RFC3542 */ 728 #ifdef IPSEC 729 #ifdef IPSEC_POLICY_IPSEC 730 /* 731 * do not raise error even if setsockopt fails, kernel may have ipsec 732 * turned off. 733 */ 734 if (setpolicy(sndsock, "in bypass") < 0) 735 errx(1, "%s", ipsec_strerror()); 736 if (setpolicy(sndsock, "out bypass") < 0) 737 errx(1, "%s", ipsec_strerror()); 738 #else 739 { 740 int level = IPSEC_LEVEL_BYPASS; 741 742 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 743 sizeof(level)); 744 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 745 sizeof(level)); 746 #ifdef IP_AUTH_TRANS_LEVEL 747 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 748 sizeof(level)); 749 #else 750 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 751 sizeof(level)); 752 #endif 753 #ifdef IP_AUTH_NETWORK_LEVEL 754 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 755 sizeof(level)); 756 #endif 757 } 758 #endif /*IPSEC_POLICY_IPSEC*/ 759 #endif /*IPSEC*/ 760 761 /* 762 * Source selection 763 */ 764 bzero(&Src, sizeof(Src)); 765 if (source) { 766 struct addrinfo hints, *res; 767 int error; 768 769 memset(&hints, 0, sizeof(hints)); 770 hints.ai_family = AF_INET6; 771 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 772 hints.ai_flags = AI_NUMERICHOST; 773 error = getaddrinfo(source, "0", &hints, &res); 774 if (error) { 775 printf("traceroute6: %s: %s\n", source, 776 gai_strerror(error)); 777 exit(1); 778 } 779 if (res->ai_addrlen > sizeof(Src)) { 780 printf("traceroute6: %s: %s\n", source, 781 gai_strerror(error)); 782 exit(1); 783 } 784 memcpy(&Src, res->ai_addr, res->ai_addrlen); 785 freeaddrinfo(res); 786 } else { 787 struct sockaddr_in6 Nxt; 788 int dummy; 789 socklen_t len; 790 791 Nxt = Dst; 792 Nxt.sin6_port = htons(DUMMY_PORT); 793 if (cmsg != NULL) 794 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 795 sizeof(Nxt.sin6_addr)); 796 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 797 perror("socket"); 798 exit(1); 799 } 800 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 801 perror("connect"); 802 exit(1); 803 } 804 len = sizeof(Src); 805 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 806 perror("getsockname"); 807 exit(1); 808 } 809 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 810 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 811 fprintf(stderr, "getnameinfo failed for source\n"); 812 exit(1); 813 } 814 source = src0; 815 close(dummy); 816 } 817 818 Src.sin6_port = htons(0); 819 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 820 perror("bind"); 821 exit(1); 822 } 823 824 { 825 socklen_t len; 826 827 len = sizeof(Src); 828 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 829 perror("getsockname"); 830 exit(1); 831 } 832 srcport = ntohs(Src.sin6_port); 833 } 834 835 /* 836 * Message to users 837 */ 838 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 839 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 840 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 841 fprintf(stderr, "traceroute6"); 842 fprintf(stderr, " to %s (%s)", hostname, hbuf); 843 if (source) 844 fprintf(stderr, " from %s", source); 845 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 846 max_hops, datalen); 847 (void) fflush(stderr); 848 849 if (first_hop > 1) 850 printf("Skipping %lu intermediate hops\n", first_hop - 1); 851 852 /* 853 * Main loop 854 */ 855 for (hops = first_hop; hops <= max_hops; ++hops) { 856 struct in6_addr lastaddr; 857 int got_there = 0; 858 int unreachable = 0; 859 860 printf("%2lu ", hops); 861 bzero(&lastaddr, sizeof(lastaddr)); 862 for (probe = 0; probe < nprobes; ++probe) { 863 int cc; 864 struct timeval t1, t2; 865 866 (void) gettimeofday(&t1, NULL); 867 if (!useicmp && htons(port + seq + 1) == 0) 868 seq++; 869 send_probe(++seq, hops); 870 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 871 (void) gettimeofday(&t2, NULL); 872 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 873 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 874 &lastaddr)) { 875 print(&rcvmhdr, cc); 876 lastaddr = Rcv.sin6_addr; 877 } 878 printf(" %g ms", deltaT(&t1, &t2)); 879 switch (i - 1) { 880 case ICMP6_DST_UNREACH_NOROUTE: 881 ++unreachable; 882 printf(" !N"); 883 break; 884 case ICMP6_DST_UNREACH_ADMIN: 885 ++unreachable; 886 printf(" !X"); 887 break; 888 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 889 ++unreachable; 890 printf(" !S"); 891 break; 892 case ICMP6_DST_UNREACH_ADDR: 893 ++unreachable; 894 printf(" !H"); 895 break; 896 case ICMP6_DST_UNREACH_NOPORT: 897 if (rcvhlim >= 0 && 898 rcvhlim <= 1) 899 printf(" !"); 900 ++got_there; 901 break; 902 } 903 break; 904 } 905 } 906 if (cc == 0) 907 printf(" *"); 908 (void) fflush(stdout); 909 } 910 putchar('\n'); 911 if (got_there || 912 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 913 exit(0); 914 } 915 } 916 917 exit(0); 918 } 919 920 int 921 wait_for_reply(sock, mhdr) 922 int sock; 923 struct msghdr *mhdr; 924 { 925 #ifdef HAVE_POLL 926 struct pollfd pfd[1]; 927 int cc = 0; 928 929 pfd[0].fd = sock; 930 pfd[0].events = POLLIN; 931 pfd[0].revents = 0; 932 933 if (poll(pfd, 1, waittime * 1000) > 0) 934 cc = recvmsg(rcvsock, mhdr, 0); 935 936 return(cc); 937 #else 938 fd_set *fdsp; 939 struct timeval wait; 940 int cc = 0, fdsn; 941 942 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 943 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 944 err(1, "malloc"); 945 memset(fdsp, 0, fdsn); 946 FD_SET(sock, fdsp); 947 wait.tv_sec = waittime; wait.tv_usec = 0; 948 949 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 950 cc = recvmsg(rcvsock, mhdr, 0); 951 952 free(fdsp); 953 return(cc); 954 #endif 955 } 956 957 #ifdef IPSEC 958 #ifdef IPSEC_POLICY_IPSEC 959 int 960 setpolicy(so, policy) 961 int so; 962 char *policy; 963 { 964 char *buf; 965 966 buf = ipsec_set_policy(policy, strlen(policy)); 967 if (buf == NULL) { 968 warnx("%s", ipsec_strerror()); 969 return -1; 970 } 971 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 972 buf, ipsec_get_policylen(buf)); 973 974 free(buf); 975 976 return 0; 977 } 978 #endif 979 #endif 980 981 void 982 send_probe(seq, hops) 983 int seq; 984 u_long hops; 985 { 986 struct timeval tv; 987 struct tv32 tv32; 988 int i; 989 990 i = hops; 991 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 992 (char *)&i, sizeof(i)) < 0) { 993 perror("setsockopt IPV6_UNICAST_HOPS"); 994 } 995 996 Dst.sin6_port = htons(port + seq); 997 (void) gettimeofday(&tv, NULL); 998 tv32.tv32_sec = htonl(tv.tv_sec); 999 tv32.tv32_usec = htonl(tv.tv_usec); 1000 1001 if (useicmp) { 1002 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 1003 1004 icp->icmp6_type = ICMP6_ECHO_REQUEST; 1005 icp->icmp6_code = 0; 1006 icp->icmp6_cksum = 0; 1007 icp->icmp6_id = ident; 1008 icp->icmp6_seq = htons(seq); 1009 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 1010 sizeof(tv32)); 1011 } else { 1012 struct opacket *op = outpacket; 1013 1014 op->seq = seq; 1015 op->hops = hops; 1016 bcopy(&tv32, &op->tv, sizeof tv32); 1017 } 1018 1019 i = sendto(sndsock, (char *)outpacket, datalen , 0, 1020 (struct sockaddr *)&Dst, Dst.sin6_len); 1021 if (i < 0 || i != datalen) { 1022 if (i < 0) 1023 perror("sendto"); 1024 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 1025 hostname, datalen, i); 1026 (void) fflush(stdout); 1027 } 1028 } 1029 1030 int 1031 get_hoplim(mhdr) 1032 struct msghdr *mhdr; 1033 { 1034 struct cmsghdr *cm; 1035 1036 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1037 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1038 if (cm->cmsg_level == IPPROTO_IPV6 && 1039 cm->cmsg_type == IPV6_HOPLIMIT && 1040 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1041 return(*(int *)CMSG_DATA(cm)); 1042 } 1043 1044 return(-1); 1045 } 1046 1047 double 1048 deltaT(t1p, t2p) 1049 struct timeval *t1p, *t2p; 1050 { 1051 double dt; 1052 1053 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1054 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1055 return (dt); 1056 } 1057 1058 /* 1059 * Convert an ICMP "type" field to a printable string. 1060 */ 1061 char * 1062 pr_type(t0) 1063 int t0; 1064 { 1065 u_char t = t0 & 0xff; 1066 char *cp; 1067 1068 switch (t) { 1069 case ICMP6_DST_UNREACH: 1070 cp = "Destination Unreachable"; 1071 break; 1072 case ICMP6_PACKET_TOO_BIG: 1073 cp = "Packet Too Big"; 1074 break; 1075 case ICMP6_TIME_EXCEEDED: 1076 cp = "Time Exceeded"; 1077 break; 1078 case ICMP6_PARAM_PROB: 1079 cp = "Parameter Problem"; 1080 break; 1081 case ICMP6_ECHO_REQUEST: 1082 cp = "Echo Request"; 1083 break; 1084 case ICMP6_ECHO_REPLY: 1085 cp = "Echo Reply"; 1086 break; 1087 case ICMP6_MEMBERSHIP_QUERY: 1088 cp = "Group Membership Query"; 1089 break; 1090 case ICMP6_MEMBERSHIP_REPORT: 1091 cp = "Group Membership Report"; 1092 break; 1093 case ICMP6_MEMBERSHIP_REDUCTION: 1094 cp = "Group Membership Reduction"; 1095 break; 1096 case ND_ROUTER_SOLICIT: 1097 cp = "Router Solicitation"; 1098 break; 1099 case ND_ROUTER_ADVERT: 1100 cp = "Router Advertisement"; 1101 break; 1102 case ND_NEIGHBOR_SOLICIT: 1103 cp = "Neighbor Solicitation"; 1104 break; 1105 case ND_NEIGHBOR_ADVERT: 1106 cp = "Neighbor Advertisement"; 1107 break; 1108 case ND_REDIRECT: 1109 cp = "Redirect"; 1110 break; 1111 default: 1112 cp = "Unknown"; 1113 break; 1114 } 1115 return cp; 1116 } 1117 1118 int 1119 packet_ok(mhdr, cc, seq) 1120 struct msghdr *mhdr; 1121 int cc; 1122 int seq; 1123 { 1124 struct icmp6_hdr *icp; 1125 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1126 u_char type, code; 1127 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1128 struct cmsghdr *cm; 1129 int *hlimp; 1130 char hbuf[NI_MAXHOST]; 1131 1132 #ifdef OLDRAWSOCKET 1133 int hlen; 1134 struct ip6_hdr *ip; 1135 #endif 1136 1137 #ifdef OLDRAWSOCKET 1138 ip = (struct ip6_hdr *) buf; 1139 hlen = sizeof(struct ip6_hdr); 1140 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1141 if (verbose) { 1142 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1143 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1144 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1145 printf("packet too short (%d bytes) from %s\n", cc, 1146 hbuf); 1147 } 1148 return (0); 1149 } 1150 cc -= hlen; 1151 icp = (struct icmp6_hdr *)(buf + hlen); 1152 #else 1153 if (cc < sizeof(struct icmp6_hdr)) { 1154 if (verbose) { 1155 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1156 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1157 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1158 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1159 } 1160 return(0); 1161 } 1162 icp = (struct icmp6_hdr *)buf; 1163 #endif 1164 /* get optional information via advanced API */ 1165 rcvpktinfo = NULL; 1166 hlimp = NULL; 1167 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1168 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1169 if (cm->cmsg_level == IPPROTO_IPV6 && 1170 cm->cmsg_type == IPV6_PKTINFO && 1171 cm->cmsg_len == 1172 CMSG_LEN(sizeof(struct in6_pktinfo))) 1173 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1174 1175 if (cm->cmsg_level == IPPROTO_IPV6 && 1176 cm->cmsg_type == IPV6_HOPLIMIT && 1177 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1178 hlimp = (int *)CMSG_DATA(cm); 1179 } 1180 if (rcvpktinfo == NULL || hlimp == NULL) { 1181 warnx("failed to get received hop limit or packet info"); 1182 #if 0 1183 return(0); 1184 #else 1185 rcvhlim = 0; /*XXX*/ 1186 #endif 1187 } 1188 else 1189 rcvhlim = *hlimp; 1190 1191 type = icp->icmp6_type; 1192 code = icp->icmp6_code; 1193 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1194 || type == ICMP6_DST_UNREACH) { 1195 struct ip6_hdr *hip; 1196 struct udphdr *up; 1197 1198 hip = (struct ip6_hdr *)(icp + 1); 1199 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1200 if (verbose) 1201 warnx("failed to get upper layer header"); 1202 return(0); 1203 } 1204 if (useicmp && 1205 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1206 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1207 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1208 else if (!useicmp && 1209 up->uh_sport == htons(srcport) && 1210 up->uh_dport == htons(port + seq)) 1211 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1212 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1213 if (icp->icmp6_id == ident && 1214 icp->icmp6_seq == htons(seq)) 1215 return (ICMP6_DST_UNREACH_NOPORT + 1); 1216 } 1217 if (verbose) { 1218 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1219 u_int8_t *p; 1220 int i; 1221 1222 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1223 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1224 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1225 printf("\n%d bytes from %s to %s", cc, sbuf, 1226 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1227 dbuf, sizeof(dbuf)) : "?"); 1228 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1229 icp->icmp6_code); 1230 p = (u_int8_t *)(icp + 1); 1231 #define WIDTH 16 1232 for (i = 0; i < cc; i++) { 1233 if (i % WIDTH == 0) 1234 printf("%04x:", i); 1235 if (i % 4 == 0) 1236 printf(" "); 1237 printf("%02x", p[i]); 1238 if (i % WIDTH == WIDTH - 1) 1239 printf("\n"); 1240 } 1241 if (cc % WIDTH != 0) 1242 printf("\n"); 1243 } 1244 return(0); 1245 } 1246 1247 /* 1248 * Increment pointer until find the UDP or ICMP header. 1249 */ 1250 struct udphdr * 1251 get_udphdr(ip6, lim) 1252 struct ip6_hdr *ip6; 1253 u_char *lim; 1254 { 1255 u_char *cp = (u_char *)ip6, nh; 1256 int hlen; 1257 1258 if (cp + sizeof(*ip6) >= lim) 1259 return(NULL); 1260 1261 nh = ip6->ip6_nxt; 1262 cp += sizeof(struct ip6_hdr); 1263 1264 while (lim - cp >= 8) { 1265 switch (nh) { 1266 case IPPROTO_ESP: 1267 case IPPROTO_TCP: 1268 return(NULL); 1269 case IPPROTO_ICMPV6: 1270 return(useicmp ? (struct udphdr *)cp : NULL); 1271 case IPPROTO_UDP: 1272 return(useicmp ? NULL : (struct udphdr *)cp); 1273 case IPPROTO_FRAGMENT: 1274 hlen = sizeof(struct ip6_frag); 1275 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1276 break; 1277 case IPPROTO_AH: 1278 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1279 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1280 break; 1281 default: 1282 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1283 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1284 break; 1285 } 1286 1287 cp += hlen; 1288 } 1289 1290 return(NULL); 1291 } 1292 1293 void 1294 print(mhdr, cc) 1295 struct msghdr *mhdr; 1296 int cc; 1297 { 1298 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1299 char hbuf[NI_MAXHOST]; 1300 1301 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1302 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1303 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1304 if (nflag) 1305 printf(" %s", hbuf); 1306 else if (lflag) 1307 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1308 else 1309 printf(" %s", inetname((struct sockaddr *)from)); 1310 1311 if (verbose) { 1312 #ifdef OLDRAWSOCKET 1313 printf(" %d bytes to %s", cc, 1314 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1315 hbuf, sizeof(hbuf)) : "?"); 1316 #else 1317 printf(" %d bytes of data to %s", cc, 1318 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1319 hbuf, sizeof(hbuf)) : "?"); 1320 #endif 1321 } 1322 } 1323 1324 /* 1325 * Construct an Internet address representation. 1326 * If the nflag has been supplied, give 1327 * numeric value, otherwise try for symbolic name. 1328 */ 1329 const char * 1330 inetname(sa) 1331 struct sockaddr *sa; 1332 { 1333 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1334 static int first = 1; 1335 char *cp; 1336 1337 if (first && !nflag) { 1338 first = 0; 1339 if (gethostname(domain, sizeof(domain)) == 0 && 1340 (cp = strchr(domain, '.'))) 1341 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1342 else 1343 domain[0] = 0; 1344 } 1345 cp = NULL; 1346 if (!nflag) { 1347 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1348 NI_NAMEREQD) == 0) { 1349 if ((cp = strchr(line, '.')) && 1350 !strcmp(cp + 1, domain)) 1351 *cp = 0; 1352 cp = line; 1353 } 1354 } 1355 if (cp) 1356 return cp; 1357 1358 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1359 NI_NUMERICHOST) != 0) 1360 strlcpy(line, "invalid", sizeof(line)); 1361 return line; 1362 } 1363 1364 void 1365 usage() 1366 { 1367 1368 fprintf(stderr, 1369 "usage: traceroute6 [-dIlnrv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1370 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1371 exit(1); 1372 } 1373
Indexes created Sun Oct 19 22:09:57 GMT 2025