traceroute6.c revision 1.20
1 /* $NetBSD: traceroute6.c,v 1.20 2002/05/26 13:14:03 itojun Exp $ */ 2 /* $KAME: traceroute6.c,v 1.50 2002/05/26 13:12:07 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 1.20 2002/05/26 13:14:03 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> 263 264 #include <netinet/in.h> 265 266 #include <arpa/inet.h> 267 268 #include <netdb.h> 269 #include <stdio.h> 270 #include <err.h> 271 #ifdef HAVE_POLL 272 #include <poll.h> 273 #endif 274 #include <errno.h> 275 #include <stdlib.h> 276 #include <string.h> 277 #include <unistd.h> 278 279 #include <netinet/ip6.h> 280 #include <netinet/icmp6.h> 281 #include <netinet/udp.h> 282 283 #ifdef IPSEC 284 #include <net/route.h> 285 #include <netinet6/ipsec.h> 286 #endif 287 288 #define DUMMY_PORT 10010 289 290 #define MAXPACKET 65535 /* max ip packet size */ 291 292 #ifndef HAVE_GETIPNODEBYNAME 293 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 294 #define freehostent(x) 295 #endif 296 297 /* 298 * format of a (udp) probe packet. 299 */ 300 struct opacket { 301 u_char seq; /* sequence number of this packet */ 302 u_char hops; /* hop limit of the packet */ 303 struct timeval tv; /* time packet left */ 304 }; 305 306 u_char packet[512]; /* last inbound (icmp) packet */ 307 struct opacket *outpacket; /* last output (udp) packet */ 308 309 int main __P((int, char *[])); 310 int wait_for_reply __P((int, struct msghdr *)); 311 #ifdef IPSEC 312 #ifdef IPSEC_POLICY_IPSEC 313 int setpolicy __P((int so, char *policy)); 314 #endif 315 #endif 316 void send_probe __P((int, int)); 317 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 318 int get_hoplim __P((struct msghdr *)); 319 double deltaT __P((struct timeval *, struct timeval *)); 320 char *pr_type __P((int)); 321 int packet_ok __P((struct msghdr *, int, int)); 322 void print __P((struct msghdr *, int)); 323 void tvsub __P((struct timeval *, struct timeval *)); 324 const char *inetname __P((struct sockaddr *)); 325 void usage __P((void)); 326 327 int rcvsock; /* receive (icmp) socket file descriptor */ 328 int sndsock; /* send (udp) socket file descriptor */ 329 struct timezone tz; /* leftover */ 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_short srcport; 352 u_short 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; 371 372 /* 373 * Receive ICMP 374 */ 375 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 376 perror("socket(ICMPv6)"); 377 exit(5); 378 } 379 380 /* revoke privs */ 381 seteuid(getuid()); 382 setuid(getuid()); 383 384 /* set a minimum set of socket options */ 385 on = 1; 386 /* specify to tell receiving interface */ 387 #ifdef IPV6_RECVPKTINFO 388 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 389 sizeof(on)) < 0) 390 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 391 #else /* old adv. API */ 392 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 393 sizeof(on)) < 0) 394 err(1, "setsockopt(IPV6_PKTINFO)"); 395 #endif 396 397 /* specify to tell value of hoplimit field of received IP6 hdr */ 398 #ifdef IPV6_RECVHOPLIMIT 399 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 400 sizeof(on)) < 0) 401 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 402 #else /* old adv. API */ 403 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 404 sizeof(on)) < 0) 405 err(1, "setsockopt(IPV6_HOPLIMIT)"); 406 #endif 407 408 seq = 0; 409 410 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 411 switch(ch) { 412 case 'd': 413 options |= SO_DEBUG; 414 break; 415 case 'f': 416 ep = NULL; 417 first_hop = strtoul(optarg, &ep, 0); 418 if (!*argv || *ep) { 419 fprintf(stderr, 420 "traceroute6: invalid min hoplimit.\n"); 421 exit(1); 422 } 423 if (first_hop > max_hops) { 424 fprintf(stderr, 425 "traceroute6: min hoplimit must be <= %d.\n", 426 max_hops); 427 exit(1); 428 } 429 break; 430 case 'g': 431 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 432 if (hp == NULL) { 433 fprintf(stderr, 434 "traceroute6: unknown host %s\n", optarg); 435 exit(1); 436 } 437 #ifdef USE_RFC2292BIS 438 if (rth == NULL) { 439 /* 440 * XXX: We can't detect the number of 441 * intermediate nodes yet. 442 */ 443 if ((rth = inet6_rth_init((void *)rtbuf, 444 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 445 0)) == NULL) { 446 fprintf(stderr, 447 "inet6_rth_init failed.\n"); 448 exit(1); 449 } 450 } 451 if (inet6_rth_add((void *)rth, 452 (struct in6_addr *)hp->h_addr)) { 453 fprintf(stderr, 454 "inet6_rth_add failed for %s\n", 455 optarg); 456 exit(1); 457 } 458 #else /* old advanced API */ 459 if (cmsg == NULL) 460 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 461 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 462 IPV6_RTHDR_LOOSE); 463 #endif 464 freehostent(hp); 465 break; 466 case 'l': 467 lflag++; 468 break; 469 case 'm': 470 ep = NULL; 471 max_hops = strtoul(optarg, &ep, 0); 472 if (!*argv || *ep) { 473 fprintf(stderr, 474 "traceroute6: invalid max hoplimit.\n"); 475 exit(1); 476 } 477 if (max_hops < first_hop) { 478 fprintf(stderr, 479 "traceroute6: max hoplimit must be >= %d.\n", 480 first_hop); 481 exit(1); 482 } 483 break; 484 case 'n': 485 nflag++; 486 break; 487 case 'p': 488 ep = NULL; 489 port = strtoul(optarg, &ep, 0); 490 if (!*argv || *ep) { 491 fprintf(stderr, "traceroute6: port.\n"); 492 exit(1); 493 } 494 if (port < 1) { 495 fprintf(stderr, 496 "traceroute6: port must be >0.\n"); 497 exit(1); 498 } 499 break; 500 case 'q': 501 ep = NULL; 502 nprobes = strtoul(optarg, &ep, 0); 503 if (!*argv || *ep) { 504 fprintf(stderr, 505 "traceroute6: invalid nprobes.\n"); 506 exit(1); 507 } 508 if (nprobes < 1) { 509 fprintf(stderr, 510 "traceroute6: nprobes must be >0.\n"); 511 exit(1); 512 } 513 break; 514 case 'r': 515 options |= SO_DONTROUTE; 516 break; 517 case 's': 518 /* 519 * set the ip source address of the outbound 520 * probe (e.g., on a multi-homed host). 521 */ 522 source = optarg; 523 break; 524 case 'v': 525 verbose++; 526 break; 527 case 'w': 528 ep = NULL; 529 waittime = strtoul(optarg, &ep, 0); 530 if (!*argv || *ep) { 531 fprintf(stderr, 532 "traceroute6: invalid wait time.\n"); 533 exit(1); 534 } 535 if (waittime <= 1) { 536 fprintf(stderr, 537 "traceroute6: wait must be >1 sec.\n"); 538 exit(1); 539 } 540 break; 541 default: 542 usage(); 543 } 544 argc -= optind; 545 argv += optind; 546 547 if (argc < 1 || argc > 2) 548 usage(); 549 550 #if 1 551 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 552 #else 553 setlinebuf (stdout); 554 #endif 555 556 memset(&hints, 0, sizeof(hints)); 557 hints.ai_family = PF_INET6; 558 hints.ai_socktype = SOCK_RAW; 559 hints.ai_protocol = IPPROTO_ICMPV6; 560 hints.ai_flags = AI_CANONNAME; 561 error = getaddrinfo(*argv, NULL, &hints, &res); 562 if (error) { 563 fprintf(stderr, 564 "traceroute6: %s\n", gai_strerror(error)); 565 exit(1); 566 } 567 if (res->ai_addrlen != sizeof(Dst)) { 568 fprintf(stderr, 569 "traceroute6: size of sockaddr mismatch\n"); 570 exit(1); 571 } 572 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 573 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 574 if (!hostname) { 575 fprintf(stderr, "traceroute6: not enough core\n"); 576 exit(1); 577 } 578 579 if (*++argv) { 580 ep = NULL; 581 datalen = strtoul(*argv, &ep, 0); 582 if (!*argv || *ep) { 583 fprintf(stderr, 584 "traceroute6: invalid packet length.\n"); 585 exit(1); 586 } 587 } 588 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 589 fprintf(stderr, 590 "traceroute6: packet size must be 0 <= s < %ld.\n", 591 (long)(MAXPACKET - sizeof(struct opacket))); 592 exit(1); 593 } 594 datalen += sizeof(struct opacket); 595 outpacket = (struct opacket *)malloc((unsigned)datalen); 596 if (! outpacket) { 597 perror("malloc"); 598 exit(1); 599 } 600 (void) bzero((char *)outpacket, datalen); 601 602 /* initialize msghdr for receiving packets */ 603 rcviov[0].iov_base = (caddr_t)packet; 604 rcviov[0].iov_len = sizeof(packet); 605 rcvmhdr.msg_name = (caddr_t)&Rcv; 606 rcvmhdr.msg_namelen = sizeof(Rcv); 607 rcvmhdr.msg_iov = rcviov; 608 rcvmhdr.msg_iovlen = 1; 609 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 610 + CMSG_SPACE(sizeof(int)); 611 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 612 fprintf(stderr, "traceroute6: malloc failed\n"); 613 exit(1); 614 } 615 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 616 rcvmhdr.msg_controllen = rcvcmsglen; 617 618 if (options & SO_DEBUG) 619 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 620 (char *)&on, sizeof(on)); 621 if (options & SO_DONTROUTE) 622 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 623 (char *)&on, sizeof(on)); 624 #ifdef IPSEC 625 #ifdef IPSEC_POLICY_IPSEC 626 /* 627 * do not raise error even if setsockopt fails, kernel may have ipsec 628 * turned off. 629 */ 630 if (setpolicy(rcvsock, "in bypass") < 0) 631 errx(1, "%s", ipsec_strerror()); 632 if (setpolicy(rcvsock, "out bypass") < 0) 633 errx(1, "%s", ipsec_strerror()); 634 #else 635 { 636 int level = IPSEC_LEVEL_NONE; 637 638 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 639 sizeof(level)); 640 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 641 sizeof(level)); 642 #ifdef IP_AUTH_TRANS_LEVEL 643 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 644 sizeof(level)); 645 #else 646 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 647 sizeof(level)); 648 #endif 649 #ifdef IP_AUTH_NETWORK_LEVEL 650 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 651 sizeof(level)); 652 #endif 653 } 654 #endif /*IPSEC_POLICY_IPSEC*/ 655 #endif /*IPSEC*/ 656 657 /* 658 * Send UDP 659 */ 660 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 661 perror("socket(SOCK_DGRAM)"); 662 exit(5); 663 } 664 #ifdef SO_SNDBUF 665 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 666 sizeof(datalen)) < 0) { 667 perror("setsockopt(SO_SNDBUF)"); 668 exit(6); 669 } 670 #endif /* SO_SNDBUF */ 671 if (options & SO_DEBUG) 672 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 673 (char *)&on, sizeof(on)); 674 if (options & SO_DONTROUTE) 675 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 676 (char *)&on, sizeof(on)); 677 #ifdef USE_RFC2292BIS 678 if (rth) {/* XXX: there is no library to finalize the header... */ 679 rth->ip6r_len = rth->ip6r_segleft * 2; 680 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 681 (void *)rth, (rth->ip6r_len + 1) << 3)) { 682 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 683 strerror(errno)); 684 exit(1); 685 } 686 } 687 #else /* old advanced API */ 688 if (cmsg != NULL) { 689 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 690 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 691 rtbuf, cmsg->cmsg_len) < 0) { 692 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 693 strerror(errno)); 694 exit(1); 695 } 696 } 697 #endif /* USE_RFC2292BIS */ 698 #ifdef IPSEC 699 #ifdef IPSEC_POLICY_IPSEC 700 /* 701 * do not raise error even if setsockopt fails, kernel may have ipsec 702 * turned off. 703 */ 704 if (setpolicy(sndsock, "in bypass") < 0) 705 errx(1, "%s", ipsec_strerror()); 706 if (setpolicy(sndsock, "out bypass") < 0) 707 errx(1, "%s", ipsec_strerror()); 708 #else 709 { 710 int level = IPSEC_LEVEL_BYPASS; 711 712 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 713 sizeof(level)); 714 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 715 sizeof(level)); 716 #ifdef IP_AUTH_TRANS_LEVEL 717 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 718 sizeof(level)); 719 #else 720 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 721 sizeof(level)); 722 #endif 723 #ifdef IP_AUTH_NETWORK_LEVEL 724 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 725 sizeof(level)); 726 #endif 727 } 728 #endif /*IPSEC_POLICY_IPSEC*/ 729 #endif /*IPSEC*/ 730 731 /* 732 * Source selection 733 */ 734 bzero(&Src, sizeof(Src)); 735 if (source) { 736 struct addrinfo hints, *res; 737 int error; 738 739 memset(&hints, 0, sizeof(hints)); 740 hints.ai_family = AF_INET6; 741 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 742 hints.ai_flags = AI_NUMERICHOST; 743 error = getaddrinfo(source, "0", &hints, &res); 744 if (error) { 745 printf("traceroute6: %s: %s\n", source, 746 gai_strerror(error)); 747 exit(1); 748 } 749 if (res->ai_addrlen > sizeof(Src)) { 750 printf("traceroute6: %s: %s\n", source, 751 gai_strerror(error)); 752 exit(1); 753 } 754 memcpy(&Src, res->ai_addr, res->ai_addrlen); 755 freeaddrinfo(res); 756 } else { 757 struct sockaddr_in6 Nxt; 758 int dummy, len; 759 760 Nxt = Dst; 761 Nxt.sin6_port = htons(DUMMY_PORT); 762 if (cmsg != NULL) 763 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 764 sizeof(Nxt.sin6_addr)); 765 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 766 perror("socket"); 767 exit(1); 768 } 769 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 770 perror("connect"); 771 exit(1); 772 } 773 len = sizeof(Src); 774 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 775 perror("getsockname"); 776 exit(1); 777 } 778 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 779 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 780 fprintf(stderr, "getnameinfo failed for source\n"); 781 exit(1); 782 } 783 source = src0; 784 close(dummy); 785 } 786 787 Src.sin6_port = htons(0); 788 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 789 perror("bind"); 790 exit(1); 791 } 792 793 { 794 int len; 795 796 len = sizeof(Src); 797 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 798 perror("getsockname"); 799 exit(1); 800 } 801 srcport = ntohs(Src.sin6_port); 802 } 803 804 /* 805 * Message to users 806 */ 807 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 808 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 809 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 810 fprintf(stderr, "traceroute6"); 811 fprintf(stderr, " to %s (%s)", hostname, hbuf); 812 if (source) 813 fprintf(stderr, " from %s", source); 814 fprintf(stderr, ", %d hops max, %d byte packets\n", 815 max_hops, datalen); 816 (void) fflush(stderr); 817 818 if (first_hop > 1) 819 printf("Skipping %d intermediate hops\n", first_hop - 1); 820 821 /* 822 * Main loop 823 */ 824 for (hops = first_hop; hops <= max_hops; ++hops) { 825 struct in6_addr lastaddr; 826 int got_there = 0; 827 int unreachable = 0; 828 829 printf("%2d ", hops); 830 bzero(&lastaddr, sizeof(lastaddr)); 831 for (probe = 0; probe < nprobes; ++probe) { 832 int cc; 833 struct timeval t1, t2; 834 struct timezone tz; 835 836 (void) gettimeofday(&t1, &tz); 837 send_probe(++seq, hops); 838 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 839 (void) gettimeofday(&t2, &tz); 840 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 841 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 842 &lastaddr)) { 843 print(&rcvmhdr, cc); 844 lastaddr = Rcv.sin6_addr; 845 } 846 printf(" %g ms", deltaT(&t1, &t2)); 847 switch(i - 1) { 848 case ICMP6_DST_UNREACH_NOROUTE: 849 ++unreachable; 850 printf(" !N"); 851 break; 852 case ICMP6_DST_UNREACH_ADMIN: 853 ++unreachable; 854 printf(" !P"); 855 break; 856 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 857 ++unreachable; 858 printf(" !S"); 859 break; 860 case ICMP6_DST_UNREACH_ADDR: 861 ++unreachable; 862 printf(" !A"); 863 break; 864 case ICMP6_DST_UNREACH_NOPORT: 865 if (rcvhlim >= 0 && 866 rcvhlim <= 1) 867 printf(" !"); 868 ++got_there; 869 break; 870 } 871 break; 872 } 873 } 874 if (cc == 0) 875 printf(" *"); 876 (void) fflush(stdout); 877 } 878 putchar('\n'); 879 if (got_there || 880 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 881 exit(0); 882 } 883 } 884 885 exit(0); 886 } 887 888 int 889 wait_for_reply(sock, mhdr) 890 int sock; 891 struct msghdr *mhdr; 892 { 893 #ifdef HAVE_POLL 894 struct pollfd pfd[1]; 895 int cc = 0; 896 897 pfd[0].fd = sock; 898 pfd[0].events = POLLIN; 899 pfd[0].revents = 0; 900 901 if (poll(pfd, 1, waittime * 1000) > 0) 902 cc = recvmsg(rcvsock, mhdr, 0); 903 904 return(cc); 905 #else 906 fd_set *fdsp; 907 struct timeval wait; 908 int cc = 0, fdsn; 909 910 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 911 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 912 err(1, "malloc"); 913 memset(fdsp, 0, fdsn); 914 FD_SET(sock, fdsp); 915 wait.tv_sec = waittime; wait.tv_usec = 0; 916 917 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 918 cc = recvmsg(rcvsock, mhdr, 0); 919 920 free(fdsp); 921 return(cc); 922 #endif 923 } 924 925 #ifdef IPSEC 926 #ifdef IPSEC_POLICY_IPSEC 927 int 928 setpolicy(so, policy) 929 int so; 930 char *policy; 931 { 932 char *buf; 933 934 buf = ipsec_set_policy(policy, strlen(policy)); 935 if (buf == NULL) { 936 warnx("%s", ipsec_strerror()); 937 return -1; 938 } 939 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 940 buf, ipsec_get_policylen(buf)); 941 942 free(buf); 943 944 return 0; 945 } 946 #endif 947 #endif 948 949 void 950 send_probe(seq, hops) 951 int seq, hops; 952 { 953 struct opacket *op = outpacket; 954 int i; 955 956 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 957 (char *)&hops, sizeof(hops)) < 0) { 958 perror("setsockopt IPV6_UNICAST_HOPS"); 959 } 960 961 Dst.sin6_port = htons(port + seq); 962 963 op->seq = seq; 964 op->hops = hops; 965 (void) gettimeofday(&op->tv, &tz); 966 967 i = sendto(sndsock, (char *)outpacket, datalen , 0, 968 (struct sockaddr *)&Dst, Dst.sin6_len); 969 if (i < 0 || i != datalen) { 970 if (i<0) 971 perror("sendto"); 972 printf("traceroute6: wrote %s %d chars, ret=%d\n", 973 hostname, datalen, i); 974 (void) fflush(stdout); 975 } 976 } 977 978 int 979 get_hoplim(mhdr) 980 struct msghdr *mhdr; 981 { 982 struct cmsghdr *cm; 983 984 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 985 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 986 if (cm->cmsg_level == IPPROTO_IPV6 && 987 cm->cmsg_type == IPV6_HOPLIMIT && 988 cm->cmsg_len == CMSG_LEN(sizeof(int))) 989 return(*(int *)CMSG_DATA(cm)); 990 } 991 992 return(-1); 993 } 994 995 double 996 deltaT(t1p, t2p) 997 struct timeval *t1p, *t2p; 998 { 999 register double dt; 1000 1001 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1002 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1003 return (dt); 1004 } 1005 1006 /* 1007 * Convert an ICMP "type" field to a printable string. 1008 */ 1009 char * 1010 pr_type(t0) 1011 int t0; 1012 { 1013 u_char t = t0 & 0xff; 1014 char *cp; 1015 1016 switch (t) { 1017 case ICMP6_DST_UNREACH: 1018 cp = "Destination Unreachable"; 1019 break; 1020 case ICMP6_PACKET_TOO_BIG: 1021 cp = "Packet Too Big"; 1022 break; 1023 case ICMP6_TIME_EXCEEDED: 1024 cp = "Time Exceeded"; 1025 break; 1026 case ICMP6_PARAM_PROB: 1027 cp = "Parameter Problem"; 1028 break; 1029 case ICMP6_ECHO_REQUEST: 1030 cp = "Echo Request"; 1031 break; 1032 case ICMP6_ECHO_REPLY: 1033 cp = "Echo Reply"; 1034 break; 1035 case ICMP6_MEMBERSHIP_QUERY: 1036 cp = "Group Membership Query"; 1037 break; 1038 case ICMP6_MEMBERSHIP_REPORT: 1039 cp = "Group Membership Report"; 1040 break; 1041 case ICMP6_MEMBERSHIP_REDUCTION: 1042 cp = "Group Membership Reduction"; 1043 break; 1044 case ND_ROUTER_SOLICIT: 1045 cp = "Router Solicitation"; 1046 break; 1047 case ND_ROUTER_ADVERT: 1048 cp = "Router Advertisement"; 1049 break; 1050 case ND_NEIGHBOR_SOLICIT: 1051 cp = "Neighbor Solicitation"; 1052 break; 1053 case ND_NEIGHBOR_ADVERT: 1054 cp = "Neighbor Advertisement"; 1055 break; 1056 case ND_REDIRECT: 1057 cp = "Redirect"; 1058 break; 1059 default: 1060 cp = "Unknown"; 1061 break; 1062 } 1063 return cp; 1064 } 1065 1066 int 1067 packet_ok(mhdr, cc, seq) 1068 struct msghdr *mhdr; 1069 int cc; 1070 int seq; 1071 { 1072 register struct icmp6_hdr *icp; 1073 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1074 u_char type, code; 1075 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1076 struct cmsghdr *cm; 1077 int *hlimp; 1078 char hbuf[NI_MAXHOST]; 1079 1080 #ifdef OLDRAWSOCKET 1081 int hlen; 1082 struct ip6_hdr *ip; 1083 #endif 1084 1085 #ifdef OLDRAWSOCKET 1086 ip = (struct ip6_hdr *) buf; 1087 hlen = sizeof(struct ip6_hdr); 1088 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1089 if (verbose) { 1090 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1091 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1092 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1093 printf("packet too short (%d bytes) from %s\n", cc, 1094 hbuf); 1095 } 1096 return (0); 1097 } 1098 cc -= hlen; 1099 icp = (struct icmp6_hdr *)(buf + hlen); 1100 #else 1101 if (cc < 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("data too short (%d bytes) from %s\n", cc, hbuf); 1107 } 1108 return(0); 1109 } 1110 icp = (struct icmp6_hdr *)buf; 1111 #endif 1112 /* get optional information via advanced API */ 1113 rcvpktinfo = NULL; 1114 hlimp = NULL; 1115 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1116 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1117 if (cm->cmsg_level == IPPROTO_IPV6 && 1118 cm->cmsg_type == IPV6_PKTINFO && 1119 cm->cmsg_len == 1120 CMSG_LEN(sizeof(struct in6_pktinfo))) 1121 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1122 1123 if (cm->cmsg_level == IPPROTO_IPV6 && 1124 cm->cmsg_type == IPV6_HOPLIMIT && 1125 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1126 hlimp = (int *)CMSG_DATA(cm); 1127 } 1128 if (rcvpktinfo == NULL || hlimp == NULL) { 1129 warnx("failed to get received hop limit or packet info"); 1130 #if 0 1131 return(0); 1132 #else 1133 rcvhlim = 0; /*XXX*/ 1134 #endif 1135 } 1136 else 1137 rcvhlim = *hlimp; 1138 1139 type = icp->icmp6_type; 1140 code = icp->icmp6_code; 1141 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1142 || type == ICMP6_DST_UNREACH) { 1143 struct ip6_hdr *hip; 1144 struct udphdr *up; 1145 1146 hip = (struct ip6_hdr *)(icp + 1); 1147 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1148 if (verbose) 1149 warnx("failed to get upper layer header"); 1150 return(0); 1151 } 1152 if (up->uh_sport == htons(srcport) && 1153 up->uh_dport == htons(port + seq)) 1154 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1155 } 1156 if (verbose) { 1157 int i; 1158 u_int8_t *p; 1159 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1160 1161 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1162 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1163 strlcpy(sbuf, "invalid", sizeof(hbuf)); 1164 printf("\n%d bytes from %s to %s", cc, sbuf, 1165 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1166 dbuf, sizeof(dbuf)) : "?"); 1167 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1168 icp->icmp6_code); 1169 p = (u_int8_t *)(icp + 1); 1170 #define WIDTH 16 1171 for (i = 0; i < cc; i++) { 1172 if (i % WIDTH == 0) 1173 printf("%04x:", i); 1174 if (i % 4 == 0) 1175 printf(" "); 1176 printf("%02x", p[i]); 1177 if (i % WIDTH == WIDTH - 1) 1178 printf("\n"); 1179 } 1180 if (cc % WIDTH != 0) 1181 printf("\n"); 1182 } 1183 return(0); 1184 } 1185 1186 /* 1187 * Increment pointer until find the UDP header. 1188 */ 1189 struct udphdr * 1190 get_udphdr(ip6, lim) 1191 struct ip6_hdr *ip6; 1192 u_char *lim; 1193 { 1194 u_char *cp = (u_char *)ip6, nh; 1195 int hlen; 1196 1197 if (cp + sizeof(*ip6) >= lim) 1198 return(NULL); 1199 1200 nh = ip6->ip6_nxt; 1201 cp += sizeof(struct ip6_hdr); 1202 1203 while (lim - cp >= 8) { 1204 switch(nh) { 1205 case IPPROTO_ESP: 1206 case IPPROTO_TCP: 1207 case IPPROTO_ICMPV6: 1208 return(NULL); 1209 case IPPROTO_UDP: 1210 return((struct udphdr *)cp); 1211 case IPPROTO_FRAGMENT: 1212 hlen = sizeof(struct ip6_frag); 1213 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1214 break; 1215 case IPPROTO_AH: 1216 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1217 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1218 break; 1219 default: 1220 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1221 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1222 break; 1223 } 1224 1225 cp += hlen; 1226 } 1227 1228 return(NULL); 1229 } 1230 1231 void 1232 print(mhdr, cc) 1233 struct msghdr *mhdr; 1234 int cc; 1235 { 1236 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1237 char hbuf[NI_MAXHOST]; 1238 1239 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1240 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1241 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1242 if (nflag) 1243 printf(" %s", hbuf); 1244 else if (lflag) 1245 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1246 else 1247 printf(" %s", inetname((struct sockaddr *)from)); 1248 1249 if (verbose) { 1250 #ifdef OLDRAWSOCKET 1251 printf(" %d bytes to %s", cc, 1252 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1253 hbuf, sizeof(hbuf)) : "?"); 1254 #else 1255 printf(" %d bytes of data to %s", cc, 1256 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1257 hbuf, sizeof(hbuf)) : "?"); 1258 #endif 1259 } 1260 } 1261 1262 /* 1263 * Subtract 2 timeval structs: out = out - in. 1264 * Out is assumed to be >= in. 1265 */ 1266 void 1267 tvsub(out, in) 1268 register struct timeval *out, *in; 1269 { 1270 1271 if ((out->tv_usec -= in->tv_usec) < 0) { 1272 out->tv_sec--; 1273 out->tv_usec += 1000000; 1274 } 1275 out->tv_sec -= in->tv_sec; 1276 } 1277 1278 /* 1279 * Construct an Internet address representation. 1280 * If the nflag has been supplied, give 1281 * numeric value, otherwise try for symbolic name. 1282 */ 1283 const char * 1284 inetname(sa) 1285 struct sockaddr *sa; 1286 { 1287 register char *cp; 1288 static char line[NI_MAXHOST]; 1289 static char domain[MAXHOSTNAMELEN + 1]; 1290 static int first = 1; 1291 1292 if (first && !nflag) { 1293 first = 0; 1294 if (gethostname(domain, sizeof(domain)) == 0 && 1295 (cp = index(domain, '.'))) 1296 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1297 else 1298 domain[0] = 0; 1299 } 1300 cp = NULL; 1301 if (!nflag) { 1302 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1303 NI_NAMEREQD) == 0) { 1304 if ((cp = index(line, '.')) && 1305 !strcmp(cp + 1, domain)) 1306 *cp = 0; 1307 cp = line; 1308 } 1309 } 1310 if (cp) 1311 return cp; 1312 1313 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1314 NI_NUMERICHOST) != 0) 1315 strlcpy(line, "invalid", sizeof(line)); 1316 return line; 1317 } 1318 1319 void 1320 usage() 1321 { 1322 1323 fprintf(stderr, 1324 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1325 " [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1326 exit(1); 1327 } 1328
Indexes created Tue Oct 21 05:10:09 GMT 2025