traceroute6.c revision 1.31
1 /* $NetBSD: traceroute6.c,v 1.31 2003/01/21 07:55:17 itojun Exp $ */ 2 /* $KAME: traceroute6.c,v 1.63 2002/10/24 12:53:25 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. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 */ 68 69 #if 0 70 #ifndef lint 71 static char copyright[] = 72 "@(#) Copyright (c) 1990, 1993\n\ 73 The Regents of the University of California. All rights reserved.\n"; 74 #endif /* not lint */ 75 76 #ifndef lint 77 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 78 #endif /* not lint */ 79 #else 80 #include <sys/cdefs.h> 81 #ifndef lint 82 __RCSID("$NetBSD: traceroute6.c,v 1.31 2003/01/21 07:55:17 itojun Exp $"); 83 #endif 84 #endif 85 86 /* 87 * traceroute host - trace the route ip packets follow going to "host". 88 * 89 * Attempt to trace the route an ip packet would follow to some 90 * internet host. We find out intermediate hops by launching probe 91 * packets with a small ttl (time to live) then listening for an 92 * icmp "time exceeded" reply from a gateway. We start our probes 93 * with a ttl of one and increase by one until we get an icmp "port 94 * unreachable" (which means we got to "host") or hit a max (which 95 * defaults to 30 hops & can be changed with the -m flag). Three 96 * probes (change with -q flag) are sent at each ttl setting and a 97 * line is printed showing the ttl, address of the gateway and 98 * round trip time of each probe. If the probe answers come from 99 * different gateways, the address of each responding system will 100 * be printed. If there is no response within a 5 sec. timeout 101 * interval (changed with the -w flag), a "*" is printed for that 102 * probe. 103 * 104 * Probe packets are UDP format. We don't want the destination 105 * host to process them so the destination port is set to an 106 * unlikely value (if some clod on the destination is using that 107 * value, it can be changed with the -p flag). 108 * 109 * A sample use might be: 110 * 111 * [yak 71]% traceroute nis.nsf.net. 112 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 113 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 114 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 115 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 116 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 117 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 118 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 119 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 120 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 121 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 122 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 123 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 124 * 125 * Note that lines 2 & 3 are the same. This is due to a buggy 126 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 127 * packets with a zero ttl. 128 * 129 * A more interesting example is: 130 * 131 * [yak 72]% traceroute allspice.lcs.mit.edu. 132 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 133 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 134 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 135 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 136 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 137 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 138 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 139 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 140 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 141 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 142 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 143 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 144 * 12 * * * 145 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 146 * 14 * * * 147 * 15 * * * 148 * 16 * * * 149 * 17 * * * 150 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 151 * 152 * (I start to see why I'm having so much trouble with mail to 153 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 154 * either don't send ICMP "time exceeded" messages or send them 155 * with a ttl too small to reach us. 14 - 17 are running the 156 * MIT C Gateway code that doesn't send "time exceeded"s. God 157 * only knows what's going on with 12. 158 * 159 * The silent gateway 12 in the above may be the result of a bug in 160 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 161 * sends an unreachable message using whatever ttl remains in the 162 * original datagram. Since, for gateways, the remaining ttl is 163 * zero, the icmp "time exceeded" is guaranteed to not make it back 164 * to us. The behavior of this bug is slightly more interesting 165 * when it appears on the destination system: 166 * 167 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 168 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 169 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 170 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 171 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 172 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 173 * 7 * * * 174 * 8 * * * 175 * 9 * * * 176 * 10 * * * 177 * 11 * * * 178 * 12 * * * 179 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 180 * 181 * Notice that there are 12 "gateways" (13 is the final 182 * destination) and exactly the last half of them are "missing". 183 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 184 * is using the ttl from our arriving datagram as the ttl in its 185 * icmp reply. So, the reply will time out on the return path 186 * (with no notice sent to anyone since icmp's aren't sent for 187 * icmp's) until we probe with a ttl that's at least twice the path 188 * length. I.e., rip is really only 7 hops away. A reply that 189 * returns with a ttl of 1 is a clue this problem exists. 190 * Traceroute prints a "!" after the time if the ttl is <= 1. 191 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 192 * non-standard (HPUX) software, expect to see this problem 193 * frequently and/or take care picking the target host of your 194 * probes. 195 * 196 * Other possible annotations after the time are !H, !N, !P (got a host, 197 * network or protocol unreachable, respectively), !S or !F (source 198 * route failed or fragmentation needed -- neither of these should 199 * ever occur and the associated gateway is busted if you see one). If 200 * almost all the probes result in some kind of unreachable, traceroute 201 * will give up and exit. 202 * 203 * Notes 204 * ----- 205 * This program must be run by root or be setuid. (I suggest that 206 * you *don't* make it setuid -- casual use could result in a lot 207 * of unnecessary traffic on our poor, congested nets.) 208 * 209 * This program requires a kernel mod that does not appear in any 210 * system available from Berkeley: A raw ip socket using proto 211 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 212 * opposed to data to be wrapped in a ip datagram). See the README 213 * file that came with the source to this program for a description 214 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 215 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 216 * MODIFIED TO RUN THIS PROGRAM. 217 * 218 * The udp port usage may appear bizarre (well, ok, it is bizarre). 219 * The problem is that an icmp message only contains 8 bytes of 220 * data from the original datagram. 8 bytes is the size of a udp 221 * header so, if we want to associate replies with the original 222 * datagram, the necessary information must be encoded into the 223 * udp header (the ip id could be used but there's no way to 224 * interlock with the kernel's assignment of ip id's and, anyway, 225 * it would have taken a lot more kernel hacking to allow this 226 * code to set the ip id). So, to allow two or more users to 227 * use traceroute simultaneously, we use this task's pid as the 228 * source port (the high bit is set to move the port number out 229 * of the "likely" range). To keep track of which probe is being 230 * replied to (so times and/or hop counts don't get confused by a 231 * reply that was delayed in transit), we increment the destination 232 * port number before each probe. 233 * 234 * Don't use this as a coding example. I was trying to find a 235 * routing problem and this code sort-of popped out after 48 hours 236 * without sleep. I was amazed it ever compiled, much less ran. 237 * 238 * I stole the idea for this program from Steve Deering. Since 239 * the first release, I've learned that had I attended the right 240 * IETF working group meetings, I also could have stolen it from Guy 241 * Almes or Matt Mathis. I don't know (or care) who came up with 242 * the idea first. I envy the originators' perspicacity and I'm 243 * glad they didn't keep the idea a secret. 244 * 245 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 246 * enhancements to the original distribution. 247 * 248 * I've hacked up a round-trip-route version of this that works by 249 * sending a loose-source-routed udp datagram through the destination 250 * back to yourself. Unfortunately, SO many gateways botch source 251 * routing, the thing is almost worthless. Maybe one day... 252 * 253 * -- Van Jacobson (van (at) helios.ee.lbl.gov) 254 * Tue Dec 20 03:50:13 PST 1988 255 */ 256 257 #include <sys/param.h> 258 #include <sys/time.h> 259 #include <sys/socket.h> 260 #include <sys/uio.h> 261 #include <sys/file.h> 262 #include <sys/ioctl.h> 263 #include <sys/sysctl.h> 264 265 #include <netinet/in.h> 266 267 #include <arpa/inet.h> 268 269 #include <netdb.h> 270 #include <stdio.h> 271 #include <err.h> 272 #ifdef HAVE_POLL 273 #include <poll.h> 274 #endif 275 #include <errno.h> 276 #include <stdlib.h> 277 #include <string.h> 278 #include <unistd.h> 279 280 #include <netinet/ip6.h> 281 #include <netinet/icmp6.h> 282 #include <netinet/udp.h> 283 284 #ifdef IPSEC 285 #include <net/route.h> 286 #include <netinet6/ipsec.h> 287 #endif 288 289 #define DUMMY_PORT 10010 290 291 #define MAXPACKET 65535 /* max ip packet size */ 292 293 #ifndef HAVE_GETIPNODEBYNAME 294 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 295 #define freehostent(x) 296 #endif 297 298 /* 299 * format of a (udp) probe packet. 300 */ 301 struct opacket { 302 u_char seq; /* sequence number of this packet */ 303 u_char hops; /* hop limit of the packet */ 304 struct timeval tv; /* time packet left */ 305 }; 306 struct tv32 { 307 u_int32_t tv32_sec; 308 u_int32_t tv32_usec; 309 }; 310 311 u_char packet[512]; /* last inbound (icmp) packet */ 312 struct opacket *outpacket; /* last output (udp) packet */ 313 314 int main __P((int, char *[])); 315 int wait_for_reply __P((int, struct msghdr *)); 316 #ifdef IPSEC 317 #ifdef IPSEC_POLICY_IPSEC 318 int setpolicy __P((int so, char *policy)); 319 #endif 320 #endif 321 void send_probe __P((int, u_long)); 322 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 323 int get_hoplim __P((struct msghdr *)); 324 double deltaT __P((struct timeval *, struct timeval *)); 325 char *pr_type __P((int)); 326 int packet_ok __P((struct msghdr *, int, int)); 327 void print __P((struct msghdr *, int)); 328 void tvsub __P((struct timeval *, struct timeval *)); 329 const char *inetname __P((struct sockaddr *)); 330 void usage __P((void)); 331 332 int rcvsock; /* receive (icmp) socket file descriptor */ 333 int sndsock; /* send (udp) socket file descriptor */ 334 335 struct msghdr rcvmhdr; 336 struct iovec rcviov[2]; 337 int rcvhlim; 338 struct in6_pktinfo *rcvpktinfo; 339 340 struct sockaddr_in6 Src, Dst, Rcv; 341 u_long datalen; /* How much data */ 342 #define ICMP6ECHOLEN 8 343 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 344 char rtbuf[2064]; 345 #ifdef USE_RFC2292BIS 346 struct ip6_rthdr *rth; 347 #endif 348 struct cmsghdr *cmsg; 349 350 char *source = 0; 351 char *hostname; 352 353 u_long nprobes = 3; 354 u_long first_hop = 1; 355 u_long max_hops = 30; 356 u_int16_t srcport; 357 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 358 u_int16_t ident; 359 int options; /* socket options */ 360 int verbose; 361 int waittime = 5; /* time to wait for response (in seconds) */ 362 int nflag; /* print addresses numerically */ 363 int useicmp; 364 int lflag; /* print both numerical address & hostname */ 365 366 int 367 main(argc, argv) 368 int argc; 369 char *argv[]; 370 { 371 struct hostent *hp; 372 int error; 373 struct addrinfo hints, *res; 374 int ch, i, on, seq, rcvcmsglen; 375 u_long probe, hops; 376 static u_char *rcvcmsgbuf; 377 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 378 char *ep; 379 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 380 size_t size = sizeof(max_hops); 381 u_long lport; 382 int minlen; 383 384 /* 385 * Receive ICMP 386 */ 387 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 388 perror("socket(ICMPv6)"); 389 exit(5); 390 } 391 392 /* revoke privs */ 393 seteuid(getuid()); 394 setuid(getuid()); 395 396 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &max_hops, &size, 397 NULL, 0); 398 399 /* set a minimum set of socket options */ 400 on = 1; 401 /* specify to tell receiving interface */ 402 #ifdef IPV6_RECVPKTINFO 403 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 404 sizeof(on)) < 0) 405 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 406 #else /* old adv. API */ 407 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 408 sizeof(on)) < 0) 409 err(1, "setsockopt(IPV6_PKTINFO)"); 410 #endif 411 412 /* specify to tell value of hoplimit field of received IP6 hdr */ 413 #ifdef IPV6_RECVHOPLIMIT 414 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 415 sizeof(on)) < 0) 416 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 417 #else /* old adv. API */ 418 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 419 sizeof(on)) < 0) 420 err(1, "setsockopt(IPV6_HOPLIMIT)"); 421 #endif 422 423 seq = 0; 424 425 while ((ch = getopt(argc, argv, "df:g:Ilm:np:q:rs:w:v")) != -1) 426 switch (ch) { 427 case 'd': 428 options |= SO_DEBUG; 429 break; 430 case 'f': 431 ep = NULL; 432 errno = 0; 433 first_hop = strtoul(optarg, &ep, 0); 434 if (errno || !*optarg || *ep|| first_hop > 255) { 435 fprintf(stderr, 436 "traceroute6: invalid min hoplimit.\n"); 437 exit(1); 438 } 439 break; 440 case 'g': 441 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 442 if (hp == NULL) { 443 fprintf(stderr, 444 "traceroute6: unknown host %s\n", optarg); 445 exit(1); 446 } 447 #ifdef USE_RFC2292BIS 448 if (rth == NULL) { 449 /* 450 * XXX: We can't detect the number of 451 * intermediate nodes yet. 452 */ 453 if ((rth = inet6_rth_init((void *)rtbuf, 454 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 455 0)) == NULL) { 456 fprintf(stderr, 457 "inet6_rth_init failed.\n"); 458 exit(1); 459 } 460 } 461 if (inet6_rth_add((void *)rth, 462 (struct in6_addr *)hp->h_addr)) { 463 fprintf(stderr, 464 "inet6_rth_add failed for %s\n", 465 optarg); 466 exit(1); 467 } 468 #else /* old advanced API */ 469 if (cmsg == NULL) 470 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 471 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 472 IPV6_RTHDR_LOOSE); 473 #endif 474 freehostent(hp); 475 break; 476 case 'I': 477 useicmp++; 478 ident = htons(getpid() & 0xffff); /* same as ping6 */ 479 break; 480 case 'l': 481 lflag++; 482 break; 483 case 'm': 484 ep = NULL; 485 errno = 0; 486 max_hops = strtoul(optarg, &ep, 0); 487 if (errno || !*optarg || *ep || max_hops > 255) { 488 fprintf(stderr, 489 "traceroute6: invalid max hoplimit.\n"); 490 exit(1); 491 } 492 break; 493 case 'n': 494 nflag++; 495 break; 496 case 'p': 497 ep = NULL; 498 errno = 0; 499 lport = strtoul(optarg, &ep, 0); 500 if (errno || !*optarg || *ep) { 501 fprintf(stderr, "traceroute6: invalid port.\n"); 502 exit(1); 503 } 504 if (lport == 0 || lport != (lport & 0xffff)) { 505 fprintf(stderr, 506 "traceroute6: port out of range.\n"); 507 exit(1); 508 } 509 port = lport & 0xffff; 510 break; 511 case 'q': 512 ep = NULL; 513 errno = 0; 514 nprobes = strtoul(optarg, &ep, 0); 515 if (errno || !*optarg || *ep) { 516 fprintf(stderr, 517 "traceroute6: invalid nprobes.\n"); 518 exit(1); 519 } 520 if (nprobes < 1) { 521 fprintf(stderr, 522 "traceroute6: nprobes must be >0.\n"); 523 exit(1); 524 } 525 break; 526 case 'r': 527 options |= SO_DONTROUTE; 528 break; 529 case 's': 530 /* 531 * set the ip source address of the outbound 532 * probe (e.g., on a multi-homed host). 533 */ 534 source = optarg; 535 break; 536 case 'v': 537 verbose++; 538 break; 539 case 'w': 540 ep = NULL; 541 errno = 0; 542 waittime = strtoul(optarg, &ep, 0); 543 if (errno || !*optarg || *ep) { 544 fprintf(stderr, 545 "traceroute6: invalid wait time.\n"); 546 exit(1); 547 } 548 if (waittime <= 1) { 549 fprintf(stderr, 550 "traceroute6: wait must be >1 sec.\n"); 551 exit(1); 552 } 553 break; 554 default: 555 usage(); 556 } 557 argc -= optind; 558 argv += optind; 559 560 if (max_hops < first_hop) { 561 fprintf(stderr, 562 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 563 exit(1); 564 } 565 566 if (argc < 1 || argc > 2) 567 usage(); 568 569 #if 1 570 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 571 #else 572 setlinebuf (stdout); 573 #endif 574 575 memset(&hints, 0, sizeof(hints)); 576 hints.ai_family = PF_INET6; 577 hints.ai_socktype = SOCK_RAW; 578 hints.ai_protocol = IPPROTO_ICMPV6; 579 hints.ai_flags = AI_CANONNAME; 580 error = getaddrinfo(*argv, NULL, &hints, &res); 581 if (error) { 582 fprintf(stderr, 583 "traceroute6: %s\n", gai_strerror(error)); 584 exit(1); 585 } 586 if (res->ai_addrlen != sizeof(Dst)) { 587 fprintf(stderr, 588 "traceroute6: size of sockaddr mismatch\n"); 589 exit(1); 590 } 591 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 592 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 593 if (!hostname) { 594 fprintf(stderr, "traceroute6: not enough core\n"); 595 exit(1); 596 } 597 if (res->ai_next) { 598 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 599 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 600 strlcpy(hbuf, "?", sizeof(hbuf)); 601 fprintf(stderr, "traceroute6: Warning: %s has multiple " 602 "addresses; using %s\n", hostname, hbuf); 603 } 604 605 if (*++argv) { 606 ep = NULL; 607 errno = 0; 608 datalen = strtoul(*argv, &ep, 0); 609 if (errno || !*argv || *ep) { 610 fprintf(stderr, 611 "traceroute6: invalid packet length.\n"); 612 exit(1); 613 } 614 } 615 if (useicmp) 616 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 617 else 618 minlen = sizeof(struct opacket); 619 if (datalen < minlen) 620 datalen = minlen; 621 else if (datalen >= MAXPACKET) { 622 fprintf(stderr, 623 "traceroute6: packet size must be %d <= s < %ld.\n", 624 minlen, (long)MAXPACKET); 625 exit(1); 626 } 627 outpacket = (struct opacket *)malloc((unsigned)datalen); 628 if (! outpacket) { 629 perror("malloc"); 630 exit(1); 631 } 632 (void) bzero((char *)outpacket, datalen); 633 634 /* initialize msghdr for receiving packets */ 635 rcviov[0].iov_base = (caddr_t)packet; 636 rcviov[0].iov_len = sizeof(packet); 637 rcvmhdr.msg_name = (caddr_t)&Rcv; 638 rcvmhdr.msg_namelen = sizeof(Rcv); 639 rcvmhdr.msg_iov = rcviov; 640 rcvmhdr.msg_iovlen = 1; 641 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 642 + CMSG_SPACE(sizeof(int)); 643 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 644 fprintf(stderr, "traceroute6: malloc failed\n"); 645 exit(1); 646 } 647 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 648 rcvmhdr.msg_controllen = rcvcmsglen; 649 650 if (options & SO_DEBUG) 651 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 652 (char *)&on, sizeof(on)); 653 if (options & SO_DONTROUTE) 654 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 655 (char *)&on, sizeof(on)); 656 #ifdef IPSEC 657 #ifdef IPSEC_POLICY_IPSEC 658 /* 659 * do not raise error even if setsockopt fails, kernel may have ipsec 660 * turned off. 661 */ 662 if (setpolicy(rcvsock, "in bypass") < 0) 663 errx(1, "%s", ipsec_strerror()); 664 if (setpolicy(rcvsock, "out bypass") < 0) 665 errx(1, "%s", ipsec_strerror()); 666 #else 667 { 668 int level = IPSEC_LEVEL_NONE; 669 670 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 671 sizeof(level)); 672 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 673 sizeof(level)); 674 #ifdef IP_AUTH_TRANS_LEVEL 675 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 676 sizeof(level)); 677 #else 678 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 679 sizeof(level)); 680 #endif 681 #ifdef IP_AUTH_NETWORK_LEVEL 682 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 683 sizeof(level)); 684 #endif 685 } 686 #endif /*IPSEC_POLICY_IPSEC*/ 687 #endif /*IPSEC*/ 688 689 /* 690 * Send UDP or ICMP 691 */ 692 if (useicmp) { 693 sndsock = rcvsock; 694 } else { 695 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 696 perror("socket(SOCK_DGRAM)"); 697 exit(5); 698 } 699 } 700 #ifdef SO_SNDBUF 701 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 702 sizeof(datalen)) < 0) { 703 perror("setsockopt(SO_SNDBUF)"); 704 exit(6); 705 } 706 #endif /* SO_SNDBUF */ 707 if (options & SO_DEBUG) 708 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 709 (char *)&on, sizeof(on)); 710 if (options & SO_DONTROUTE) 711 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 712 (char *)&on, sizeof(on)); 713 #ifdef USE_RFC2292BIS 714 if (rth) {/* XXX: there is no library to finalize the header... */ 715 rth->ip6r_len = rth->ip6r_segleft * 2; 716 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 717 (void *)rth, (rth->ip6r_len + 1) << 3)) { 718 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 719 strerror(errno)); 720 exit(1); 721 } 722 } 723 #else /* old advanced API */ 724 if (cmsg != NULL) { 725 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 726 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 727 rtbuf, cmsg->cmsg_len) < 0) { 728 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 729 strerror(errno)); 730 exit(1); 731 } 732 } 733 #endif /* USE_RFC2292BIS */ 734 #ifdef IPSEC 735 #ifdef IPSEC_POLICY_IPSEC 736 /* 737 * do not raise error even if setsockopt fails, kernel may have ipsec 738 * turned off. 739 */ 740 if (setpolicy(sndsock, "in bypass") < 0) 741 errx(1, "%s", ipsec_strerror()); 742 if (setpolicy(sndsock, "out bypass") < 0) 743 errx(1, "%s", ipsec_strerror()); 744 #else 745 { 746 int level = IPSEC_LEVEL_BYPASS; 747 748 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 749 sizeof(level)); 750 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 751 sizeof(level)); 752 #ifdef IP_AUTH_TRANS_LEVEL 753 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 754 sizeof(level)); 755 #else 756 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 757 sizeof(level)); 758 #endif 759 #ifdef IP_AUTH_NETWORK_LEVEL 760 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 761 sizeof(level)); 762 #endif 763 } 764 #endif /*IPSEC_POLICY_IPSEC*/ 765 #endif /*IPSEC*/ 766 767 /* 768 * Source selection 769 */ 770 bzero(&Src, sizeof(Src)); 771 if (source) { 772 struct addrinfo hints, *res; 773 int error; 774 775 memset(&hints, 0, sizeof(hints)); 776 hints.ai_family = AF_INET6; 777 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 778 hints.ai_flags = AI_NUMERICHOST; 779 error = getaddrinfo(source, "0", &hints, &res); 780 if (error) { 781 printf("traceroute6: %s: %s\n", source, 782 gai_strerror(error)); 783 exit(1); 784 } 785 if (res->ai_addrlen > sizeof(Src)) { 786 printf("traceroute6: %s: %s\n", source, 787 gai_strerror(error)); 788 exit(1); 789 } 790 memcpy(&Src, res->ai_addr, res->ai_addrlen); 791 freeaddrinfo(res); 792 } else { 793 struct sockaddr_in6 Nxt; 794 int dummy; 795 socklen_t len; 796 797 Nxt = Dst; 798 Nxt.sin6_port = htons(DUMMY_PORT); 799 if (cmsg != NULL) 800 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 801 sizeof(Nxt.sin6_addr)); 802 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 803 perror("socket"); 804 exit(1); 805 } 806 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 807 perror("connect"); 808 exit(1); 809 } 810 len = sizeof(Src); 811 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 812 perror("getsockname"); 813 exit(1); 814 } 815 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 816 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 817 fprintf(stderr, "getnameinfo failed for source\n"); 818 exit(1); 819 } 820 source = src0; 821 close(dummy); 822 } 823 824 Src.sin6_port = htons(0); 825 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 826 perror("bind"); 827 exit(1); 828 } 829 830 { 831 socklen_t len; 832 833 len = sizeof(Src); 834 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 835 perror("getsockname"); 836 exit(1); 837 } 838 srcport = ntohs(Src.sin6_port); 839 } 840 841 /* 842 * Message to users 843 */ 844 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 845 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 846 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 847 fprintf(stderr, "traceroute6"); 848 fprintf(stderr, " to %s (%s)", hostname, hbuf); 849 if (source) 850 fprintf(stderr, " from %s", source); 851 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 852 max_hops, datalen); 853 (void) fflush(stderr); 854 855 if (first_hop > 1) 856 printf("Skipping %lu intermediate hops\n", first_hop - 1); 857 858 /* 859 * Main loop 860 */ 861 for (hops = first_hop; hops <= max_hops; ++hops) { 862 struct in6_addr lastaddr; 863 int got_there = 0; 864 int unreachable = 0; 865 866 printf("%2lu ", hops); 867 bzero(&lastaddr, sizeof(lastaddr)); 868 for (probe = 0; probe < nprobes; ++probe) { 869 int cc; 870 struct timeval t1, t2; 871 872 (void) gettimeofday(&t1, NULL); 873 send_probe(++seq, hops); 874 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 875 (void) gettimeofday(&t2, NULL); 876 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 877 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 878 &lastaddr)) { 879 print(&rcvmhdr, cc); 880 lastaddr = Rcv.sin6_addr; 881 } 882 printf(" %g ms", deltaT(&t1, &t2)); 883 switch (i - 1) { 884 case ICMP6_DST_UNREACH_NOROUTE: 885 ++unreachable; 886 printf(" !N"); 887 break; 888 case ICMP6_DST_UNREACH_ADMIN: 889 ++unreachable; 890 printf(" !P"); 891 break; 892 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 893 ++unreachable; 894 printf(" !S"); 895 break; 896 case ICMP6_DST_UNREACH_ADDR: 897 ++unreachable; 898 printf(" !A"); 899 break; 900 case ICMP6_DST_UNREACH_NOPORT: 901 if (rcvhlim >= 0 && 902 rcvhlim <= 1) 903 printf(" !"); 904 ++got_there; 905 break; 906 } 907 break; 908 } 909 } 910 if (cc == 0) 911 printf(" *"); 912 (void) fflush(stdout); 913 } 914 putchar('\n'); 915 if (got_there || 916 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 917 exit(0); 918 } 919 } 920 921 exit(0); 922 } 923 924 int 925 wait_for_reply(sock, mhdr) 926 int sock; 927 struct msghdr *mhdr; 928 { 929 #ifdef HAVE_POLL 930 struct pollfd pfd[1]; 931 int cc = 0; 932 933 pfd[0].fd = sock; 934 pfd[0].events = POLLIN; 935 pfd[0].revents = 0; 936 937 if (poll(pfd, 1, waittime * 1000) > 0) 938 cc = recvmsg(rcvsock, mhdr, 0); 939 940 return(cc); 941 #else 942 fd_set *fdsp; 943 struct timeval wait; 944 int cc = 0, fdsn; 945 946 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 947 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 948 err(1, "malloc"); 949 memset(fdsp, 0, fdsn); 950 FD_SET(sock, fdsp); 951 wait.tv_sec = waittime; wait.tv_usec = 0; 952 953 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 954 cc = recvmsg(rcvsock, mhdr, 0); 955 956 free(fdsp); 957 return(cc); 958 #endif 959 } 960 961 #ifdef IPSEC 962 #ifdef IPSEC_POLICY_IPSEC 963 int 964 setpolicy(so, policy) 965 int so; 966 char *policy; 967 { 968 char *buf; 969 970 buf = ipsec_set_policy(policy, strlen(policy)); 971 if (buf == NULL) { 972 warnx("%s", ipsec_strerror()); 973 return -1; 974 } 975 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 976 buf, ipsec_get_policylen(buf)); 977 978 free(buf); 979 980 return 0; 981 } 982 #endif 983 #endif 984 985 void 986 send_probe(seq, hops) 987 int seq; 988 u_long hops; 989 { 990 int i; 991 992 i = hops; 993 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 994 (char *)&i, sizeof(i)) < 0) { 995 perror("setsockopt IPV6_UNICAST_HOPS"); 996 } 997 998 Dst.sin6_port = htons(port + seq); 999 1000 if (useicmp) { 1001 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 1002 struct timeval tv; 1003 struct tv32 *tv32; 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 (void) gettimeofday(&tv, NULL); 1011 tv32 = (struct tv32 *)((u_int8_t *)outpacket + ICMP6ECHOLEN); 1012 tv32->tv32_sec = htonl(tv.tv_sec); 1013 tv32->tv32_usec = htonl(tv.tv_usec); 1014 } else { 1015 struct opacket *op = outpacket; 1016 op->seq = seq; 1017 op->hops = hops; 1018 (void) gettimeofday(&op->tv, NULL); 1019 } 1020 1021 i = sendto(sndsock, (char *)outpacket, datalen , 0, 1022 (struct sockaddr *)&Dst, Dst.sin6_len); 1023 if (i < 0 || i != datalen) { 1024 if (i<0) 1025 perror("sendto"); 1026 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 1027 hostname, datalen, i); 1028 (void) fflush(stdout); 1029 } 1030 } 1031 1032 int 1033 get_hoplim(mhdr) 1034 struct msghdr *mhdr; 1035 { 1036 struct cmsghdr *cm; 1037 1038 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1039 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1040 if (cm->cmsg_level == IPPROTO_IPV6 && 1041 cm->cmsg_type == IPV6_HOPLIMIT && 1042 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1043 return(*(int *)CMSG_DATA(cm)); 1044 } 1045 1046 return(-1); 1047 } 1048 1049 double 1050 deltaT(t1p, t2p) 1051 struct timeval *t1p, *t2p; 1052 { 1053 register double dt; 1054 1055 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1056 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1057 return (dt); 1058 } 1059 1060 /* 1061 * Convert an ICMP "type" field to a printable string. 1062 */ 1063 char * 1064 pr_type(t0) 1065 int t0; 1066 { 1067 u_char t = t0 & 0xff; 1068 char *cp; 1069 1070 switch (t) { 1071 case ICMP6_DST_UNREACH: 1072 cp = "Destination Unreachable"; 1073 break; 1074 case ICMP6_PACKET_TOO_BIG: 1075 cp = "Packet Too Big"; 1076 break; 1077 case ICMP6_TIME_EXCEEDED: 1078 cp = "Time Exceeded"; 1079 break; 1080 case ICMP6_PARAM_PROB: 1081 cp = "Parameter Problem"; 1082 break; 1083 case ICMP6_ECHO_REQUEST: 1084 cp = "Echo Request"; 1085 break; 1086 case ICMP6_ECHO_REPLY: 1087 cp = "Echo Reply"; 1088 break; 1089 case ICMP6_MEMBERSHIP_QUERY: 1090 cp = "Group Membership Query"; 1091 break; 1092 case ICMP6_MEMBERSHIP_REPORT: 1093 cp = "Group Membership Report"; 1094 break; 1095 case ICMP6_MEMBERSHIP_REDUCTION: 1096 cp = "Group Membership Reduction"; 1097 break; 1098 case ND_ROUTER_SOLICIT: 1099 cp = "Router Solicitation"; 1100 break; 1101 case ND_ROUTER_ADVERT: 1102 cp = "Router Advertisement"; 1103 break; 1104 case ND_NEIGHBOR_SOLICIT: 1105 cp = "Neighbor Solicitation"; 1106 break; 1107 case ND_NEIGHBOR_ADVERT: 1108 cp = "Neighbor Advertisement"; 1109 break; 1110 case ND_REDIRECT: 1111 cp = "Redirect"; 1112 break; 1113 default: 1114 cp = "Unknown"; 1115 break; 1116 } 1117 return cp; 1118 } 1119 1120 int 1121 packet_ok(mhdr, cc, seq) 1122 struct msghdr *mhdr; 1123 int cc; 1124 int seq; 1125 { 1126 register struct icmp6_hdr *icp; 1127 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1128 u_char type, code; 1129 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1130 struct cmsghdr *cm; 1131 int *hlimp; 1132 char hbuf[NI_MAXHOST]; 1133 1134 #ifdef OLDRAWSOCKET 1135 int hlen; 1136 struct ip6_hdr *ip; 1137 #endif 1138 1139 #ifdef OLDRAWSOCKET 1140 ip = (struct ip6_hdr *) buf; 1141 hlen = sizeof(struct ip6_hdr); 1142 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1143 if (verbose) { 1144 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1145 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1146 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1147 printf("packet too short (%d bytes) from %s\n", cc, 1148 hbuf); 1149 } 1150 return (0); 1151 } 1152 cc -= hlen; 1153 icp = (struct icmp6_hdr *)(buf + hlen); 1154 #else 1155 if (cc < sizeof(struct icmp6_hdr)) { 1156 if (verbose) { 1157 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1158 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1159 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1160 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1161 } 1162 return(0); 1163 } 1164 icp = (struct icmp6_hdr *)buf; 1165 #endif 1166 /* get optional information via advanced API */ 1167 rcvpktinfo = NULL; 1168 hlimp = NULL; 1169 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1170 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1171 if (cm->cmsg_level == IPPROTO_IPV6 && 1172 cm->cmsg_type == IPV6_PKTINFO && 1173 cm->cmsg_len == 1174 CMSG_LEN(sizeof(struct in6_pktinfo))) 1175 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1176 1177 if (cm->cmsg_level == IPPROTO_IPV6 && 1178 cm->cmsg_type == IPV6_HOPLIMIT && 1179 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1180 hlimp = (int *)CMSG_DATA(cm); 1181 } 1182 if (rcvpktinfo == NULL || hlimp == NULL) { 1183 warnx("failed to get received hop limit or packet info"); 1184 #if 0 1185 return(0); 1186 #else 1187 rcvhlim = 0; /*XXX*/ 1188 #endif 1189 } 1190 else 1191 rcvhlim = *hlimp; 1192 1193 type = icp->icmp6_type; 1194 code = icp->icmp6_code; 1195 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1196 || type == ICMP6_DST_UNREACH) { 1197 struct ip6_hdr *hip; 1198 struct udphdr *up; 1199 1200 hip = (struct ip6_hdr *)(icp + 1); 1201 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1202 if (verbose) 1203 warnx("failed to get upper layer header"); 1204 return(0); 1205 } 1206 if (useicmp && 1207 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1208 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1209 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1210 else if (!useicmp && 1211 up->uh_sport == htons(srcport) && 1212 up->uh_dport == htons(port + seq)) 1213 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1214 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1215 if (icp->icmp6_id == ident && 1216 icp->icmp6_seq == htons(seq)) 1217 return (ICMP6_DST_UNREACH_NOPORT + 1); 1218 } 1219 if (verbose) { 1220 int i; 1221 u_int8_t *p; 1222 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1223 1224 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1225 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1226 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1227 printf("\n%d bytes from %s to %s", cc, sbuf, 1228 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1229 dbuf, sizeof(dbuf)) : "?"); 1230 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1231 icp->icmp6_code); 1232 p = (u_int8_t *)(icp + 1); 1233 #define WIDTH 16 1234 for (i = 0; i < cc; i++) { 1235 if (i % WIDTH == 0) 1236 printf("%04x:", i); 1237 if (i % 4 == 0) 1238 printf(" "); 1239 printf("%02x", p[i]); 1240 if (i % WIDTH == WIDTH - 1) 1241 printf("\n"); 1242 } 1243 if (cc % WIDTH != 0) 1244 printf("\n"); 1245 } 1246 return(0); 1247 } 1248 1249 /* 1250 * Increment pointer until find the UDP or ICMP header. 1251 */ 1252 struct udphdr * 1253 get_udphdr(ip6, lim) 1254 struct ip6_hdr *ip6; 1255 u_char *lim; 1256 { 1257 u_char *cp = (u_char *)ip6, nh; 1258 int hlen; 1259 1260 if (cp + sizeof(*ip6) >= lim) 1261 return(NULL); 1262 1263 nh = ip6->ip6_nxt; 1264 cp += sizeof(struct ip6_hdr); 1265 1266 while (lim - cp >= 8) { 1267 switch (nh) { 1268 case IPPROTO_ESP: 1269 case IPPROTO_TCP: 1270 return(NULL); 1271 case IPPROTO_ICMPV6: 1272 return(useicmp ? (struct udphdr *)cp : NULL); 1273 case IPPROTO_UDP: 1274 return(useicmp ? NULL : (struct udphdr *)cp); 1275 case IPPROTO_FRAGMENT: 1276 hlen = sizeof(struct ip6_frag); 1277 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1278 break; 1279 case IPPROTO_AH: 1280 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1281 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1282 break; 1283 default: 1284 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1285 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1286 break; 1287 } 1288 1289 cp += hlen; 1290 } 1291 1292 return(NULL); 1293 } 1294 1295 void 1296 print(mhdr, cc) 1297 struct msghdr *mhdr; 1298 int cc; 1299 { 1300 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1301 char hbuf[NI_MAXHOST]; 1302 1303 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1304 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1305 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1306 if (nflag) 1307 printf(" %s", hbuf); 1308 else if (lflag) 1309 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1310 else 1311 printf(" %s", inetname((struct sockaddr *)from)); 1312 1313 if (verbose) { 1314 #ifdef OLDRAWSOCKET 1315 printf(" %d bytes to %s", cc, 1316 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1317 hbuf, sizeof(hbuf)) : "?"); 1318 #else 1319 printf(" %d bytes of data to %s", cc, 1320 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1321 hbuf, sizeof(hbuf)) : "?"); 1322 #endif 1323 } 1324 } 1325 1326 /* 1327 * Subtract 2 timeval structs: out = out - in. 1328 * Out is assumed to be >= in. 1329 */ 1330 void 1331 tvsub(out, in) 1332 register struct timeval *out, *in; 1333 { 1334 1335 if ((out->tv_usec -= in->tv_usec) < 0) { 1336 out->tv_sec--; 1337 out->tv_usec += 1000000; 1338 } 1339 out->tv_sec -= in->tv_sec; 1340 } 1341 1342 /* 1343 * Construct an Internet address representation. 1344 * If the nflag has been supplied, give 1345 * numeric value, otherwise try for symbolic name. 1346 */ 1347 const char * 1348 inetname(sa) 1349 struct sockaddr *sa; 1350 { 1351 register char *cp; 1352 static char line[NI_MAXHOST]; 1353 static char domain[MAXHOSTNAMELEN + 1]; 1354 static int first = 1; 1355 1356 if (first && !nflag) { 1357 first = 0; 1358 if (gethostname(domain, sizeof(domain)) == 0 && 1359 (cp = strchr(domain, '.'))) 1360 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1361 else 1362 domain[0] = 0; 1363 } 1364 cp = NULL; 1365 if (!nflag) { 1366 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1367 NI_NAMEREQD) == 0) { 1368 if ((cp = strchr(line, '.')) && 1369 !strcmp(cp + 1, domain)) 1370 *cp = 0; 1371 cp = line; 1372 } 1373 } 1374 if (cp) 1375 return cp; 1376 1377 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1378 NI_NUMERICHOST) != 0) 1379 strlcpy(line, "invalid", sizeof(line)); 1380 return line; 1381 } 1382 1383 void 1384 usage() 1385 { 1386 1387 fprintf(stderr, 1388 "usage: traceroute6 [-dIlnrv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1389 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1390 exit(1); 1391 } 1392
Indexes created Mon Oct 20 11:09:49 GMT 2025