traceroute6.c revision 1.25
1 /* $NetBSD: traceroute6.c,v 1.25 2002/08/27 00:34:52 itojun Exp $ */ 2 /* $KAME: traceroute6.c,v 1.58 2002/08/27 00:33:39 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. 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 1.25 2002/08/27 00:34:52 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 }; 306 307 u_char packet[512]; /* last inbound (icmp) packet */ 308 struct opacket *outpacket; /* last output (udp) packet */ 309 310 int main __P((int, char *[])); 311 int wait_for_reply __P((int, struct msghdr *)); 312 #ifdef IPSEC 313 #ifdef IPSEC_POLICY_IPSEC 314 int setpolicy __P((int so, char *policy)); 315 #endif 316 #endif 317 void send_probe __P((int, int)); 318 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 319 int get_hoplim __P((struct msghdr *)); 320 double deltaT __P((struct timeval *, struct timeval *)); 321 char *pr_type __P((int)); 322 int packet_ok __P((struct msghdr *, int, int)); 323 void print __P((struct msghdr *, int)); 324 void tvsub __P((struct timeval *, struct timeval *)); 325 const char *inetname __P((struct sockaddr *)); 326 void usage __P((void)); 327 328 int rcvsock; /* receive (icmp) socket file descriptor */ 329 int sndsock; /* send (udp) socket file descriptor */ 330 331 struct msghdr rcvmhdr; 332 struct iovec rcviov[2]; 333 int rcvhlim; 334 struct in6_pktinfo *rcvpktinfo; 335 336 struct sockaddr_in6 Src, Dst, Rcv; 337 int datalen; /* How much data */ 338 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 339 char rtbuf[2064]; 340 #ifdef USE_RFC2292BIS 341 struct ip6_rthdr *rth; 342 #endif 343 struct cmsghdr *cmsg; 344 345 char *source = 0; 346 char *hostname; 347 348 int nprobes = 3; 349 int first_hop = 1; 350 int max_hops = 30; 351 u_int16_t srcport; 352 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 353 int options; /* socket options */ 354 int verbose; 355 int waittime = 5; /* time to wait for response (in seconds) */ 356 int nflag; /* print addresses numerically */ 357 int lflag; /* print both numerical address & hostname */ 358 359 int 360 main(argc, argv) 361 int argc; 362 char *argv[]; 363 { 364 struct hostent *hp; 365 int error; 366 struct addrinfo hints, *res; 367 int ch, i, on, probe, seq, hops, rcvcmsglen; 368 static u_char *rcvcmsgbuf; 369 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 370 char *ep; 371 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 372 size_t size = sizeof(max_hops); 373 u_long lport; 374 375 /* 376 * Receive ICMP 377 */ 378 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 379 perror("socket(ICMPv6)"); 380 exit(5); 381 } 382 383 /* revoke privs */ 384 seteuid(getuid()); 385 setuid(getuid()); 386 387 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &max_hops, &size, 388 NULL, 0); 389 390 /* set a minimum set of socket options */ 391 on = 1; 392 /* specify to tell receiving interface */ 393 #ifdef IPV6_RECVPKTINFO 394 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 395 sizeof(on)) < 0) 396 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 397 #else /* old adv. API */ 398 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 399 sizeof(on)) < 0) 400 err(1, "setsockopt(IPV6_PKTINFO)"); 401 #endif 402 403 /* specify to tell value of hoplimit field of received IP6 hdr */ 404 #ifdef IPV6_RECVHOPLIMIT 405 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 406 sizeof(on)) < 0) 407 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 408 #else /* old adv. API */ 409 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 410 sizeof(on)) < 0) 411 err(1, "setsockopt(IPV6_HOPLIMIT)"); 412 #endif 413 414 seq = 0; 415 416 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 417 switch (ch) { 418 case 'd': 419 options |= SO_DEBUG; 420 break; 421 case 'f': 422 ep = NULL; 423 first_hop = strtoul(optarg, &ep, 0); 424 if (!*argv || *ep) { 425 fprintf(stderr, 426 "traceroute6: invalid min hoplimit.\n"); 427 exit(1); 428 } 429 if (first_hop > max_hops) { 430 fprintf(stderr, 431 "traceroute6: min hoplimit must be <= %d.\n", 432 max_hops); 433 exit(1); 434 } 435 break; 436 case 'g': 437 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 438 if (hp == NULL) { 439 fprintf(stderr, 440 "traceroute6: unknown host %s\n", optarg); 441 exit(1); 442 } 443 #ifdef USE_RFC2292BIS 444 if (rth == NULL) { 445 /* 446 * XXX: We can't detect the number of 447 * intermediate nodes yet. 448 */ 449 if ((rth = inet6_rth_init((void *)rtbuf, 450 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 451 0)) == NULL) { 452 fprintf(stderr, 453 "inet6_rth_init failed.\n"); 454 exit(1); 455 } 456 } 457 if (inet6_rth_add((void *)rth, 458 (struct in6_addr *)hp->h_addr)) { 459 fprintf(stderr, 460 "inet6_rth_add failed for %s\n", 461 optarg); 462 exit(1); 463 } 464 #else /* old advanced API */ 465 if (cmsg == NULL) 466 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 467 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 468 IPV6_RTHDR_LOOSE); 469 #endif 470 freehostent(hp); 471 break; 472 case 'l': 473 lflag++; 474 break; 475 case 'm': 476 ep = NULL; 477 max_hops = strtoul(optarg, &ep, 0); 478 if (!*argv || *ep) { 479 fprintf(stderr, 480 "traceroute6: invalid max hoplimit.\n"); 481 exit(1); 482 } 483 if (max_hops < first_hop) { 484 fprintf(stderr, 485 "traceroute6: max hoplimit must be >= %d.\n", 486 first_hop); 487 exit(1); 488 } 489 break; 490 case 'n': 491 nflag++; 492 break; 493 case 'p': 494 ep = NULL; 495 lport = strtoul(optarg, &ep, 0); 496 if (!*argv || *ep) { 497 fprintf(stderr, "traceroute6: port.\n"); 498 exit(1); 499 } 500 if (lport == 0 || lport != (lport & 0xffff)) { 501 fprintf(stderr, 502 "traceroute6: port out of range.\n"); 503 exit(1); 504 } 505 port = lport & 0xffff; 506 break; 507 case 'q': 508 ep = NULL; 509 nprobes = strtoul(optarg, &ep, 0); 510 if (!*argv || *ep) { 511 fprintf(stderr, 512 "traceroute6: invalid nprobes.\n"); 513 exit(1); 514 } 515 if (nprobes < 1) { 516 fprintf(stderr, 517 "traceroute6: nprobes must be >0.\n"); 518 exit(1); 519 } 520 break; 521 case 'r': 522 options |= SO_DONTROUTE; 523 break; 524 case 's': 525 /* 526 * set the ip source address of the outbound 527 * probe (e.g., on a multi-homed host). 528 */ 529 source = optarg; 530 break; 531 case 'v': 532 verbose++; 533 break; 534 case 'w': 535 ep = NULL; 536 waittime = strtoul(optarg, &ep, 0); 537 if (!*argv || *ep) { 538 fprintf(stderr, 539 "traceroute6: invalid wait time.\n"); 540 exit(1); 541 } 542 if (waittime <= 1) { 543 fprintf(stderr, 544 "traceroute6: wait must be >1 sec.\n"); 545 exit(1); 546 } 547 break; 548 default: 549 usage(); 550 } 551 argc -= optind; 552 argv += optind; 553 554 if (argc < 1 || argc > 2) 555 usage(); 556 557 #if 1 558 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 559 #else 560 setlinebuf (stdout); 561 #endif 562 563 memset(&hints, 0, sizeof(hints)); 564 hints.ai_family = PF_INET6; 565 hints.ai_socktype = SOCK_RAW; 566 hints.ai_protocol = IPPROTO_ICMPV6; 567 hints.ai_flags = AI_CANONNAME; 568 error = getaddrinfo(*argv, NULL, &hints, &res); 569 if (error) { 570 fprintf(stderr, 571 "traceroute6: %s\n", gai_strerror(error)); 572 exit(1); 573 } 574 if (res->ai_addrlen != sizeof(Dst)) { 575 fprintf(stderr, 576 "traceroute6: size of sockaddr mismatch\n"); 577 exit(1); 578 } 579 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 580 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 581 if (!hostname) { 582 fprintf(stderr, "traceroute6: not enough core\n"); 583 exit(1); 584 } 585 if (res->ai_next) { 586 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 587 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 588 strlcpy(hbuf, "?", sizeof(hbuf)); 589 fprintf(stderr, "traceroute6: Warning: %s has multiple " 590 "addresses; using %s\n", hostname, hbuf); 591 } 592 593 if (*++argv) { 594 ep = NULL; 595 datalen = strtoul(*argv, &ep, 0); 596 if (!*argv || *ep) { 597 fprintf(stderr, 598 "traceroute6: invalid packet length.\n"); 599 exit(1); 600 } 601 } 602 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 603 fprintf(stderr, 604 "traceroute6: packet size must be 0 <= s < %ld.\n", 605 (long)(MAXPACKET - sizeof(struct opacket))); 606 exit(1); 607 } 608 datalen += sizeof(struct opacket); 609 outpacket = (struct opacket *)malloc((unsigned)datalen); 610 if (! outpacket) { 611 perror("malloc"); 612 exit(1); 613 } 614 (void) bzero((char *)outpacket, datalen); 615 616 /* initialize msghdr for receiving packets */ 617 rcviov[0].iov_base = (caddr_t)packet; 618 rcviov[0].iov_len = sizeof(packet); 619 rcvmhdr.msg_name = (caddr_t)&Rcv; 620 rcvmhdr.msg_namelen = sizeof(Rcv); 621 rcvmhdr.msg_iov = rcviov; 622 rcvmhdr.msg_iovlen = 1; 623 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 624 + CMSG_SPACE(sizeof(int)); 625 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 626 fprintf(stderr, "traceroute6: malloc failed\n"); 627 exit(1); 628 } 629 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 630 rcvmhdr.msg_controllen = rcvcmsglen; 631 632 if (options & SO_DEBUG) 633 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 634 (char *)&on, sizeof(on)); 635 if (options & SO_DONTROUTE) 636 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 637 (char *)&on, sizeof(on)); 638 #ifdef IPSEC 639 #ifdef IPSEC_POLICY_IPSEC 640 /* 641 * do not raise error even if setsockopt fails, kernel may have ipsec 642 * turned off. 643 */ 644 if (setpolicy(rcvsock, "in bypass") < 0) 645 errx(1, "%s", ipsec_strerror()); 646 if (setpolicy(rcvsock, "out bypass") < 0) 647 errx(1, "%s", ipsec_strerror()); 648 #else 649 { 650 int level = IPSEC_LEVEL_NONE; 651 652 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 653 sizeof(level)); 654 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 655 sizeof(level)); 656 #ifdef IP_AUTH_TRANS_LEVEL 657 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 658 sizeof(level)); 659 #else 660 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 661 sizeof(level)); 662 #endif 663 #ifdef IP_AUTH_NETWORK_LEVEL 664 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 665 sizeof(level)); 666 #endif 667 } 668 #endif /*IPSEC_POLICY_IPSEC*/ 669 #endif /*IPSEC*/ 670 671 /* 672 * Send UDP 673 */ 674 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 675 perror("socket(SOCK_DGRAM)"); 676 exit(5); 677 } 678 #ifdef SO_SNDBUF 679 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 680 sizeof(datalen)) < 0) { 681 perror("setsockopt(SO_SNDBUF)"); 682 exit(6); 683 } 684 #endif /* SO_SNDBUF */ 685 if (options & SO_DEBUG) 686 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 687 (char *)&on, sizeof(on)); 688 if (options & SO_DONTROUTE) 689 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 690 (char *)&on, sizeof(on)); 691 #ifdef USE_RFC2292BIS 692 if (rth) {/* XXX: there is no library to finalize the header... */ 693 rth->ip6r_len = rth->ip6r_segleft * 2; 694 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 695 (void *)rth, (rth->ip6r_len + 1) << 3)) { 696 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 697 strerror(errno)); 698 exit(1); 699 } 700 } 701 #else /* old advanced API */ 702 if (cmsg != NULL) { 703 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 704 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 705 rtbuf, cmsg->cmsg_len) < 0) { 706 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 707 strerror(errno)); 708 exit(1); 709 } 710 } 711 #endif /* USE_RFC2292BIS */ 712 #ifdef IPSEC 713 #ifdef IPSEC_POLICY_IPSEC 714 /* 715 * do not raise error even if setsockopt fails, kernel may have ipsec 716 * turned off. 717 */ 718 if (setpolicy(sndsock, "in bypass") < 0) 719 errx(1, "%s", ipsec_strerror()); 720 if (setpolicy(sndsock, "out bypass") < 0) 721 errx(1, "%s", ipsec_strerror()); 722 #else 723 { 724 int level = IPSEC_LEVEL_BYPASS; 725 726 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 727 sizeof(level)); 728 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 729 sizeof(level)); 730 #ifdef IP_AUTH_TRANS_LEVEL 731 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 732 sizeof(level)); 733 #else 734 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 735 sizeof(level)); 736 #endif 737 #ifdef IP_AUTH_NETWORK_LEVEL 738 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 739 sizeof(level)); 740 #endif 741 } 742 #endif /*IPSEC_POLICY_IPSEC*/ 743 #endif /*IPSEC*/ 744 745 /* 746 * Source selection 747 */ 748 bzero(&Src, sizeof(Src)); 749 if (source) { 750 struct addrinfo hints, *res; 751 int error; 752 753 memset(&hints, 0, sizeof(hints)); 754 hints.ai_family = AF_INET6; 755 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 756 hints.ai_flags = AI_NUMERICHOST; 757 error = getaddrinfo(source, "0", &hints, &res); 758 if (error) { 759 printf("traceroute6: %s: %s\n", source, 760 gai_strerror(error)); 761 exit(1); 762 } 763 if (res->ai_addrlen > sizeof(Src)) { 764 printf("traceroute6: %s: %s\n", source, 765 gai_strerror(error)); 766 exit(1); 767 } 768 memcpy(&Src, res->ai_addr, res->ai_addrlen); 769 freeaddrinfo(res); 770 } else { 771 struct sockaddr_in6 Nxt; 772 int dummy, len; 773 774 Nxt = Dst; 775 Nxt.sin6_port = htons(DUMMY_PORT); 776 if (cmsg != NULL) 777 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 778 sizeof(Nxt.sin6_addr)); 779 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 780 perror("socket"); 781 exit(1); 782 } 783 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 784 perror("connect"); 785 exit(1); 786 } 787 len = sizeof(Src); 788 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 789 perror("getsockname"); 790 exit(1); 791 } 792 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 793 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 794 fprintf(stderr, "getnameinfo failed for source\n"); 795 exit(1); 796 } 797 source = src0; 798 close(dummy); 799 } 800 801 Src.sin6_port = htons(0); 802 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 803 perror("bind"); 804 exit(1); 805 } 806 807 { 808 int len; 809 810 len = sizeof(Src); 811 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 812 perror("getsockname"); 813 exit(1); 814 } 815 srcport = ntohs(Src.sin6_port); 816 } 817 818 /* 819 * Message to users 820 */ 821 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 822 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 823 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 824 fprintf(stderr, "traceroute6"); 825 fprintf(stderr, " to %s (%s)", hostname, hbuf); 826 if (source) 827 fprintf(stderr, " from %s", source); 828 fprintf(stderr, ", %d hops max, %d byte packets\n", 829 max_hops, datalen); 830 (void) fflush(stderr); 831 832 if (first_hop > 1) 833 printf("Skipping %d intermediate hops\n", first_hop - 1); 834 835 /* 836 * Main loop 837 */ 838 for (hops = first_hop; hops <= max_hops; ++hops) { 839 struct in6_addr lastaddr; 840 int got_there = 0; 841 int unreachable = 0; 842 843 printf("%2d ", hops); 844 bzero(&lastaddr, sizeof(lastaddr)); 845 for (probe = 0; probe < nprobes; ++probe) { 846 int cc; 847 struct timeval t1, t2; 848 849 (void) gettimeofday(&t1, NULL); 850 send_probe(++seq, hops); 851 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 852 (void) gettimeofday(&t2, NULL); 853 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 854 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 855 &lastaddr)) { 856 print(&rcvmhdr, cc); 857 lastaddr = Rcv.sin6_addr; 858 } 859 printf(" %g ms", deltaT(&t1, &t2)); 860 switch (i - 1) { 861 case ICMP6_DST_UNREACH_NOROUTE: 862 ++unreachable; 863 printf(" !N"); 864 break; 865 case ICMP6_DST_UNREACH_ADMIN: 866 ++unreachable; 867 printf(" !P"); 868 break; 869 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 870 ++unreachable; 871 printf(" !S"); 872 break; 873 case ICMP6_DST_UNREACH_ADDR: 874 ++unreachable; 875 printf(" !A"); 876 break; 877 case ICMP6_DST_UNREACH_NOPORT: 878 if (rcvhlim >= 0 && 879 rcvhlim <= 1) 880 printf(" !"); 881 ++got_there; 882 break; 883 } 884 break; 885 } 886 } 887 if (cc == 0) 888 printf(" *"); 889 (void) fflush(stdout); 890 } 891 putchar('\n'); 892 if (got_there || 893 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 894 exit(0); 895 } 896 } 897 898 exit(0); 899 } 900 901 int 902 wait_for_reply(sock, mhdr) 903 int sock; 904 struct msghdr *mhdr; 905 { 906 #ifdef HAVE_POLL 907 struct pollfd pfd[1]; 908 int cc = 0; 909 910 pfd[0].fd = sock; 911 pfd[0].events = POLLIN; 912 pfd[0].revents = 0; 913 914 if (poll(pfd, 1, waittime * 1000) > 0) 915 cc = recvmsg(rcvsock, mhdr, 0); 916 917 return(cc); 918 #else 919 fd_set *fdsp; 920 struct timeval wait; 921 int cc = 0, fdsn; 922 923 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 924 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 925 err(1, "malloc"); 926 memset(fdsp, 0, fdsn); 927 FD_SET(sock, fdsp); 928 wait.tv_sec = waittime; wait.tv_usec = 0; 929 930 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 931 cc = recvmsg(rcvsock, mhdr, 0); 932 933 free(fdsp); 934 return(cc); 935 #endif 936 } 937 938 #ifdef IPSEC 939 #ifdef IPSEC_POLICY_IPSEC 940 int 941 setpolicy(so, policy) 942 int so; 943 char *policy; 944 { 945 char *buf; 946 947 buf = ipsec_set_policy(policy, strlen(policy)); 948 if (buf == NULL) { 949 warnx("%s", ipsec_strerror()); 950 return -1; 951 } 952 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 953 buf, ipsec_get_policylen(buf)); 954 955 free(buf); 956 957 return 0; 958 } 959 #endif 960 #endif 961 962 void 963 send_probe(seq, hops) 964 int seq, hops; 965 { 966 struct opacket *op = outpacket; 967 int i; 968 969 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 970 (char *)&hops, sizeof(hops)) < 0) { 971 perror("setsockopt IPV6_UNICAST_HOPS"); 972 } 973 974 Dst.sin6_port = htons(port + seq); 975 976 op->seq = seq; 977 op->hops = hops; 978 (void) gettimeofday(&op->tv, NULL); 979 980 i = sendto(sndsock, (char *)outpacket, datalen , 0, 981 (struct sockaddr *)&Dst, Dst.sin6_len); 982 if (i < 0 || i != datalen) { 983 if (i<0) 984 perror("sendto"); 985 printf("traceroute6: wrote %s %d chars, ret=%d\n", 986 hostname, datalen, i); 987 (void) fflush(stdout); 988 } 989 } 990 991 int 992 get_hoplim(mhdr) 993 struct msghdr *mhdr; 994 { 995 struct cmsghdr *cm; 996 997 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 998 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 999 if (cm->cmsg_level == IPPROTO_IPV6 && 1000 cm->cmsg_type == IPV6_HOPLIMIT && 1001 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1002 return(*(int *)CMSG_DATA(cm)); 1003 } 1004 1005 return(-1); 1006 } 1007 1008 double 1009 deltaT(t1p, t2p) 1010 struct timeval *t1p, *t2p; 1011 { 1012 register double dt; 1013 1014 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1015 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1016 return (dt); 1017 } 1018 1019 /* 1020 * Convert an ICMP "type" field to a printable string. 1021 */ 1022 char * 1023 pr_type(t0) 1024 int t0; 1025 { 1026 u_char t = t0 & 0xff; 1027 char *cp; 1028 1029 switch (t) { 1030 case ICMP6_DST_UNREACH: 1031 cp = "Destination Unreachable"; 1032 break; 1033 case ICMP6_PACKET_TOO_BIG: 1034 cp = "Packet Too Big"; 1035 break; 1036 case ICMP6_TIME_EXCEEDED: 1037 cp = "Time Exceeded"; 1038 break; 1039 case ICMP6_PARAM_PROB: 1040 cp = "Parameter Problem"; 1041 break; 1042 case ICMP6_ECHO_REQUEST: 1043 cp = "Echo Request"; 1044 break; 1045 case ICMP6_ECHO_REPLY: 1046 cp = "Echo Reply"; 1047 break; 1048 case ICMP6_MEMBERSHIP_QUERY: 1049 cp = "Group Membership Query"; 1050 break; 1051 case ICMP6_MEMBERSHIP_REPORT: 1052 cp = "Group Membership Report"; 1053 break; 1054 case ICMP6_MEMBERSHIP_REDUCTION: 1055 cp = "Group Membership Reduction"; 1056 break; 1057 case ND_ROUTER_SOLICIT: 1058 cp = "Router Solicitation"; 1059 break; 1060 case ND_ROUTER_ADVERT: 1061 cp = "Router Advertisement"; 1062 break; 1063 case ND_NEIGHBOR_SOLICIT: 1064 cp = "Neighbor Solicitation"; 1065 break; 1066 case ND_NEIGHBOR_ADVERT: 1067 cp = "Neighbor Advertisement"; 1068 break; 1069 case ND_REDIRECT: 1070 cp = "Redirect"; 1071 break; 1072 default: 1073 cp = "Unknown"; 1074 break; 1075 } 1076 return cp; 1077 } 1078 1079 int 1080 packet_ok(mhdr, cc, seq) 1081 struct msghdr *mhdr; 1082 int cc; 1083 int seq; 1084 { 1085 register struct icmp6_hdr *icp; 1086 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1087 u_char type, code; 1088 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1089 struct cmsghdr *cm; 1090 int *hlimp; 1091 char hbuf[NI_MAXHOST]; 1092 1093 #ifdef OLDRAWSOCKET 1094 int hlen; 1095 struct ip6_hdr *ip; 1096 #endif 1097 1098 #ifdef OLDRAWSOCKET 1099 ip = (struct ip6_hdr *) buf; 1100 hlen = sizeof(struct ip6_hdr); 1101 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1102 if (verbose) { 1103 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1104 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1105 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1106 printf("packet too short (%d bytes) from %s\n", cc, 1107 hbuf); 1108 } 1109 return (0); 1110 } 1111 cc -= hlen; 1112 icp = (struct icmp6_hdr *)(buf + hlen); 1113 #else 1114 if (cc < sizeof(struct icmp6_hdr)) { 1115 if (verbose) { 1116 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1117 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1118 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1119 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1120 } 1121 return(0); 1122 } 1123 icp = (struct icmp6_hdr *)buf; 1124 #endif 1125 /* get optional information via advanced API */ 1126 rcvpktinfo = NULL; 1127 hlimp = NULL; 1128 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1129 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1130 if (cm->cmsg_level == IPPROTO_IPV6 && 1131 cm->cmsg_type == IPV6_PKTINFO && 1132 cm->cmsg_len == 1133 CMSG_LEN(sizeof(struct in6_pktinfo))) 1134 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1135 1136 if (cm->cmsg_level == IPPROTO_IPV6 && 1137 cm->cmsg_type == IPV6_HOPLIMIT && 1138 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1139 hlimp = (int *)CMSG_DATA(cm); 1140 } 1141 if (rcvpktinfo == NULL || hlimp == NULL) { 1142 warnx("failed to get received hop limit or packet info"); 1143 #if 0 1144 return(0); 1145 #else 1146 rcvhlim = 0; /*XXX*/ 1147 #endif 1148 } 1149 else 1150 rcvhlim = *hlimp; 1151 1152 type = icp->icmp6_type; 1153 code = icp->icmp6_code; 1154 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1155 || type == ICMP6_DST_UNREACH) { 1156 struct ip6_hdr *hip; 1157 struct udphdr *up; 1158 1159 hip = (struct ip6_hdr *)(icp + 1); 1160 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1161 if (verbose) 1162 warnx("failed to get upper layer header"); 1163 return(0); 1164 } 1165 if (up->uh_sport == htons(srcport) && 1166 up->uh_dport == htons(port + seq)) 1167 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1168 } 1169 if (verbose) { 1170 int i; 1171 u_int8_t *p; 1172 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1173 1174 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1175 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1176 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1177 printf("\n%d bytes from %s to %s", cc, sbuf, 1178 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1179 dbuf, sizeof(dbuf)) : "?"); 1180 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1181 icp->icmp6_code); 1182 p = (u_int8_t *)(icp + 1); 1183 #define WIDTH 16 1184 for (i = 0; i < cc; i++) { 1185 if (i % WIDTH == 0) 1186 printf("%04x:", i); 1187 if (i % 4 == 0) 1188 printf(" "); 1189 printf("%02x", p[i]); 1190 if (i % WIDTH == WIDTH - 1) 1191 printf("\n"); 1192 } 1193 if (cc % WIDTH != 0) 1194 printf("\n"); 1195 } 1196 return(0); 1197 } 1198 1199 /* 1200 * Increment pointer until find the UDP header. 1201 */ 1202 struct udphdr * 1203 get_udphdr(ip6, lim) 1204 struct ip6_hdr *ip6; 1205 u_char *lim; 1206 { 1207 u_char *cp = (u_char *)ip6, nh; 1208 int hlen; 1209 1210 if (cp + sizeof(*ip6) >= lim) 1211 return(NULL); 1212 1213 nh = ip6->ip6_nxt; 1214 cp += sizeof(struct ip6_hdr); 1215 1216 while (lim - cp >= 8) { 1217 switch (nh) { 1218 case IPPROTO_ESP: 1219 case IPPROTO_TCP: 1220 case IPPROTO_ICMPV6: 1221 return(NULL); 1222 case IPPROTO_UDP: 1223 return((struct udphdr *)cp); 1224 case IPPROTO_FRAGMENT: 1225 hlen = sizeof(struct ip6_frag); 1226 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1227 break; 1228 case IPPROTO_AH: 1229 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1230 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1231 break; 1232 default: 1233 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1234 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1235 break; 1236 } 1237 1238 cp += hlen; 1239 } 1240 1241 return(NULL); 1242 } 1243 1244 void 1245 print(mhdr, cc) 1246 struct msghdr *mhdr; 1247 int cc; 1248 { 1249 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1250 char hbuf[NI_MAXHOST]; 1251 1252 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1253 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1254 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1255 if (nflag) 1256 printf(" %s", hbuf); 1257 else if (lflag) 1258 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1259 else 1260 printf(" %s", inetname((struct sockaddr *)from)); 1261 1262 if (verbose) { 1263 #ifdef OLDRAWSOCKET 1264 printf(" %d bytes to %s", cc, 1265 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1266 hbuf, sizeof(hbuf)) : "?"); 1267 #else 1268 printf(" %d bytes of data to %s", cc, 1269 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1270 hbuf, sizeof(hbuf)) : "?"); 1271 #endif 1272 } 1273 } 1274 1275 /* 1276 * Subtract 2 timeval structs: out = out - in. 1277 * Out is assumed to be >= in. 1278 */ 1279 void 1280 tvsub(out, in) 1281 register struct timeval *out, *in; 1282 { 1283 1284 if ((out->tv_usec -= in->tv_usec) < 0) { 1285 out->tv_sec--; 1286 out->tv_usec += 1000000; 1287 } 1288 out->tv_sec -= in->tv_sec; 1289 } 1290 1291 /* 1292 * Construct an Internet address representation. 1293 * If the nflag has been supplied, give 1294 * numeric value, otherwise try for symbolic name. 1295 */ 1296 const char * 1297 inetname(sa) 1298 struct sockaddr *sa; 1299 { 1300 register char *cp; 1301 static char line[NI_MAXHOST]; 1302 static char domain[MAXHOSTNAMELEN + 1]; 1303 static int first = 1; 1304 1305 if (first && !nflag) { 1306 first = 0; 1307 if (gethostname(domain, sizeof(domain)) == 0 && 1308 (cp = strchr(domain, '.'))) 1309 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1310 else 1311 domain[0] = 0; 1312 } 1313 cp = NULL; 1314 if (!nflag) { 1315 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1316 NI_NAMEREQD) == 0) { 1317 if ((cp = strchr(line, '.')) && 1318 !strcmp(cp + 1, domain)) 1319 *cp = 0; 1320 cp = line; 1321 } 1322 } 1323 if (cp) 1324 return cp; 1325 1326 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1327 NI_NUMERICHOST) != 0) 1328 strlcpy(line, "invalid", sizeof(line)); 1329 return line; 1330 } 1331 1332 void 1333 usage() 1334 { 1335 1336 fprintf(stderr, 1337 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1338 " [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1339 exit(1); 1340 } 1341
Indexes created Mon Oct 20 03:09:53 GMT 2025