1 /* $KAME: traceroute6.c,v 1.42 2001/05/08 04:36:41 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved. 32 * @(#)traceroute.c 8.1 (Berkeley) 6/6/93 33 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.4.2.4 2001/07/03 11:02:18 ume Exp $ 34 * $DragonFly: src/usr.sbin/traceroute6/traceroute6.c,v 1.3 2003/11/03 19:31:44 eirikn Exp $ 35 */ 36 37 /*- 38 * Copyright (c) 1990, 1993 39 * The Regents of the University of California. All rights reserved. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * Van Jacobson. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 */ 72 73 /* 74 * traceroute host - trace the route ip packets follow going to "host". 75 * 76 * Attempt to trace the route an ip packet would follow to some 77 * internet host. We find out intermediate hops by launching probe 78 * packets with a small ttl (time to live) then listening for an 79 * icmp "time exceeded" reply from a gateway. We start our probes 80 * with a ttl of one and increase by one until we get an icmp "port 81 * unreachable" (which means we got to "host") or hit a max (which 82 * defaults to 30 hops & can be changed with the -m flag). Three 83 * probes (change with -q flag) are sent at each ttl setting and a 84 * line is printed showing the ttl, address of the gateway and 85 * round trip time of each probe. If the probe answers come from 86 * different gateways, the address of each responding system will 87 * be printed. If there is no response within a 5 sec. timeout 88 * interval (changed with the -w flag), a "*" is printed for that 89 * probe. 90 * 91 * Probe packets are UDP format. We don't want the destination 92 * host to process them so the destination port is set to an 93 * unlikely value (if some clod on the destination is using that 94 * value, it can be changed with the -p flag). 95 * 96 * A sample use might be: 97 * 98 * [yak 71]% traceroute nis.nsf.net. 99 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 100 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 101 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 102 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 103 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 104 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 105 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 106 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 107 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 108 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 109 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 110 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 111 * 112 * Note that lines 2 & 3 are the same. This is due to a buggy 113 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 114 * packets with a zero ttl. 115 * 116 * A more interesting example is: 117 * 118 * [yak 72]% traceroute allspice.lcs.mit.edu. 119 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 120 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 121 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 122 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 123 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 124 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 125 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 126 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 127 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 128 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 129 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 130 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 131 * 12 * * * 132 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 133 * 14 * * * 134 * 15 * * * 135 * 16 * * * 136 * 17 * * * 137 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 138 * 139 * (I start to see why I'm having so much trouble with mail to 140 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 141 * either don't send ICMP "time exceeded" messages or send them 142 * with a ttl too small to reach us. 14 - 17 are running the 143 * MIT C Gateway code that doesn't send "time exceeded"s. God 144 * only knows what's going on with 12. 145 * 146 * The silent gateway 12 in the above may be the result of a bug in 147 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 148 * sends an unreachable message using whatever ttl remains in the 149 * original datagram. Since, for gateways, the remaining ttl is 150 * zero, the icmp "time exceeded" is guaranteed to not make it back 151 * to us. The behavior of this bug is slightly more interesting 152 * when it appears on the destination system: 153 * 154 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 155 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 156 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 157 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 158 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 159 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 160 * 7 * * * 161 * 8 * * * 162 * 9 * * * 163 * 10 * * * 164 * 11 * * * 165 * 12 * * * 166 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 167 * 168 * Notice that there are 12 "gateways" (13 is the final 169 * destination) and exactly the last half of them are "missing". 170 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 171 * is using the ttl from our arriving datagram as the ttl in its 172 * icmp reply. So, the reply will time out on the return path 173 * (with no notice sent to anyone since icmp's aren't sent for 174 * icmp's) until we probe with a ttl that's at least twice the path 175 * length. I.e., rip is really only 7 hops away. A reply that 176 * returns with a ttl of 1 is a clue this problem exists. 177 * Traceroute prints a "!" after the time if the ttl is <= 1. 178 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 179 * non-standard (HPUX) software, expect to see this problem 180 * frequently and/or take care picking the target host of your 181 * probes. 182 * 183 * Other possible annotations after the time are !H, !N, !P (got a host, 184 * network or protocol unreachable, respectively), !S or !F (source 185 * route failed or fragmentation needed -- neither of these should 186 * ever occur and the associated gateway is busted if you see one). If 187 * almost all the probes result in some kind of unreachable, traceroute 188 * will give up and exit. 189 * 190 * Notes 191 * ----- 192 * This program must be run by root or be setuid. (I suggest that 193 * you *don't* make it setuid -- casual use could result in a lot 194 * of unnecessary traffic on our poor, congested nets.) 195 * 196 * This program requires a kernel mod that does not appear in any 197 * system available from Berkeley: A raw ip socket using proto 198 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 199 * opposed to data to be wrapped in a ip datagram). See the README 200 * file that came with the source to this program for a description 201 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 202 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 203 * MODIFIED TO RUN THIS PROGRAM. 204 * 205 * The udp port usage may appear bizarre (well, ok, it is bizarre). 206 * The problem is that an icmp message only contains 8 bytes of 207 * data from the original datagram. 8 bytes is the size of a udp 208 * header so, if we want to associate replies with the original 209 * datagram, the necessary information must be encoded into the 210 * udp header (the ip id could be used but there's no way to 211 * interlock with the kernel's assignment of ip id's and, anyway, 212 * it would have taken a lot more kernel hacking to allow this 213 * code to set the ip id). So, to allow two or more users to 214 * use traceroute simultaneously, we use this task's pid as the 215 * source port (the high bit is set to move the port number out 216 * of the "likely" range). To keep track of which probe is being 217 * replied to (so times and/or hop counts don't get confused by a 218 * reply that was delayed in transit), we increment the destination 219 * port number before each probe. 220 * 221 * Don't use this as a coding example. I was trying to find a 222 * routing problem and this code sort-of popped out after 48 hours 223 * without sleep. I was amazed it ever compiled, much less ran. 224 * 225 * I stole the idea for this program from Steve Deering. Since 226 * the first release, I've learned that had I attended the right 227 * IETF working group meetings, I also could have stolen it from Guy 228 * Almes or Matt Mathis. I don't know (or care) who came up with 229 * the idea first. I envy the originators' perspicacity and I'm 230 * glad they didn't keep the idea a secret. 231 * 232 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 233 * enhancements to the original distribution. 234 * 235 * I've hacked up a round-trip-route version of this that works by 236 * sending a loose-source-routed udp datagram through the destination 237 * back to yourself. Unfortunately, SO many gateways botch source 238 * routing, the thing is almost worthless. Maybe one day... 239 * 240 * -- Van Jacobson (van@helios.ee.lbl.gov) 241 * Tue Dec 20 03:50:13 PST 1988 242 */ 243 244 #include <sys/param.h> 245 #include <sys/time.h> 246 #include <sys/socket.h> 247 #include <sys/uio.h> 248 #include <sys/file.h> 249 #include <sys/ioctl.h> 250 251 #include <netinet/in.h> 252 253 #include <arpa/inet.h> 254 255 #include <netdb.h> 256 #include <stdio.h> 257 #include <err.h> 258 #ifdef HAVE_POLL 259 #include <poll.h> 260 #endif 261 #include <errno.h> 262 #include <stdlib.h> 263 #include <string.h> 264 #include <unistd.h> 265 266 #include <netinet/ip6.h> 267 #include <netinet/icmp6.h> 268 #include <netinet/udp.h> 269 270 #ifdef IPSEC 271 #include <net/route.h> 272 #include <netinet6/ipsec.h> 273 #endif 274 275 #define DUMMY_PORT 10010 276 277 #define MAXPACKET 65535 /* max ip packet size */ 278 #ifndef MAXHOSTNAMELEN 279 #define MAXHOSTNAMELEN 64 280 #endif 281 282 #ifndef FD_SET 283 #define NFDBITS (8*sizeof(fd_set)) 284 #define FD_SETSIZE NFDBITS 285 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) 286 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) 287 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) 288 #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p))) 289 #endif 290 291 #define Fprintf (void)fprintf 292 #define Sprintf (void)sprintf 293 #define Printf (void)printf 294 295 #ifndef HAVE_GETIPNODEBYNAME 296 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 297 #define freehostent(x) 298 #endif 299 300 /* 301 * format of a (udp) probe packet. 302 */ 303 struct opacket { 304 u_char seq; /* sequence number of this packet */ 305 u_char hops; /* hop limit of the packet */ 306 struct timeval tv; /* time packet left */ 307 }; 308 309 u_char packet[512]; /* last inbound (icmp) packet */ 310 struct opacket *outpacket; /* last output (udp) packet */ 311 312 int main(int, char *[]); 313 int wait_for_reply(int, struct msghdr *); 314 #ifdef IPSEC 315 #ifdef IPSEC_POLICY_IPSEC 316 int setpolicy(int so, char *policy); 317 #endif 318 #endif 319 void send_probe(int, int); 320 struct udphdr *get_udphdr(struct ip6_hdr *, u_char *); 321 int get_hoplim(struct msghdr *); 322 double deltaT(struct timeval *, struct timeval *); 323 char *pr_type(int); 324 int packet_ok(struct msghdr *, int, int); 325 void print(struct msghdr *, int); 326 void tvsub(struct timeval *, struct timeval *); 327 const char *inetname(struct sockaddr *); 328 void usage(void); 329 330 int rcvsock; /* receive (icmp) socket file descriptor */ 331 int sndsock; /* send (udp) socket file descriptor */ 332 struct timezone tz; /* leftover */ 333 334 struct msghdr rcvmhdr; 335 struct iovec rcviov[2]; 336 int rcvhlim; 337 struct in6_pktinfo *rcvpktinfo; 338 339 struct sockaddr_in6 Src, Dst, Rcv; 340 int datalen; /* How much data */ 341 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 342 char rtbuf[2064]; 343 #ifdef USE_RFC2292BIS 344 struct ip6_rthdr *rth; 345 #endif 346 struct cmsghdr *cmsg; 347 348 char *source = 0; 349 char *hostname; 350 351 int nprobes = 3; 352 int first_hop = 1; 353 int max_hops = 30; 354 u_short ident; 355 u_short port = 32768+666; /* start udp dest port # for probe packets */ 356 int options; /* socket options */ 357 int verbose; 358 int waittime = 5; /* time to wait for response (in seconds) */ 359 int nflag; /* print addresses numerically */ 360 int lflag; /* print both numerical address & hostname */ 361 362 #ifdef KAME_SCOPEID 363 const int niflag = NI_WITHSCOPEID; 364 #else 365 const int niflag = 0; 366 #endif 367 368 int 369 main(argc, argv) 370 int argc; 371 char *argv[]; 372 { 373 struct hostent *hp; 374 int error; 375 struct addrinfo hints, *res; 376 int ch, i, on, probe, seq, hops, rcvcmsglen; 377 static u_char *rcvcmsgbuf; 378 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 379 char *ep; 380 381 /* 382 * Receive ICMP 383 */ 384 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 385 perror("socket(ICMPv6)"); 386 exit(5); 387 } 388 389 /* revoke privs */ 390 seteuid(getuid()); 391 setuid(getuid()); 392 393 /* set a minimum set of socket options */ 394 on = 1; 395 /* specify to tell receiving interface */ 396 #ifdef IPV6_RECVPKTINFO 397 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 398 sizeof(on)) < 0) 399 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 400 #else /* old adv. API */ 401 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 402 sizeof(on)) < 0) 403 err(1, "setsockopt(IPV6_PKTINFO)"); 404 #endif 405 406 /* specify to tell value of hoplimit field of received IP6 hdr */ 407 #ifdef IPV6_RECVHOPLIMIT 408 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 409 sizeof(on)) < 0) 410 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 411 #else /* old adv. API */ 412 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 413 sizeof(on)) < 0) 414 err(1, "setsockopt(IPV6_HOPLIMIT)"); 415 #endif 416 417 seq = 0; 418 419 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 420 switch(ch) { 421 case 'd': 422 options |= SO_DEBUG; 423 break; 424 case 'f': 425 ep = NULL; 426 first_hop = strtoul(optarg, &ep, 0); 427 if (!*argv || *ep) { 428 Fprintf(stderr, 429 "traceroute6: invalid min hoplimit.\n"); 430 exit(1); 431 } 432 if (first_hop > max_hops) { 433 Fprintf(stderr, 434 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 435 exit(1); 436 } 437 break; 438 case 'g': 439 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 440 if (hp == NULL) { 441 Fprintf(stderr, 442 "traceroute6: unknown host %s\n", optarg); 443 exit(1); 444 } 445 #ifdef USE_RFC2292BIS 446 if (rth == NULL) { 447 /* 448 * XXX: We can't detect the number of 449 * intermediate nodes yet. 450 */ 451 if ((rth = inet6_rth_init((void *)rtbuf, 452 sizeof(rtbuf), 453 IPV6_RTHDR_TYPE_0, 454 0)) == NULL) { 455 Fprintf(stderr, 456 "inet6_rth_init failed.\n"); 457 exit(1); 458 } 459 } 460 if (inet6_rth_add((void *)rth, 461 (struct in6_addr *)hp->h_addr)) { 462 Fprintf(stderr, 463 "inet6_rth_add failed for %s\n", 464 optarg); 465 exit(1); 466 } 467 #else /* old advanced API */ 468 if (cmsg == NULL) 469 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 470 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 471 #endif 472 freehostent(hp); 473 break; 474 case 'l': 475 lflag++; 476 break; 477 case 'm': 478 ep = NULL; 479 max_hops = strtoul(optarg, &ep, 0); 480 if (!*argv || *ep) { 481 Fprintf(stderr, 482 "traceroute6: invalid max hoplimit.\n"); 483 exit(1); 484 } 485 if (max_hops < first_hop) { 486 Fprintf(stderr, 487 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 488 exit(1); 489 } 490 break; 491 case 'n': 492 nflag++; 493 break; 494 case 'p': 495 ep = NULL; 496 port = strtoul(optarg, &ep, 0); 497 if (!*argv || *ep) { 498 Fprintf(stderr, 499 "traceroute6: port.\n"); 500 exit(1); 501 } 502 if (port < 1) { 503 Fprintf(stderr, 504 "traceroute6: port must be >0.\n"); 505 exit(1); 506 } 507 break; 508 case 'q': 509 ep = NULL; 510 nprobes = strtoul(optarg, &ep, 0); 511 if (!*argv || *ep) { 512 Fprintf(stderr, 513 "traceroute6: invalid nprobes.\n"); 514 exit(1); 515 } 516 if (nprobes < 1) { 517 Fprintf(stderr, 518 "traceroute6: nprobes must be >0.\n"); 519 exit(1); 520 } 521 break; 522 case 'r': 523 options |= SO_DONTROUTE; 524 break; 525 case 's': 526 /* 527 * set the ip source address of the outbound 528 * probe (e.g., on a multi-homed host). 529 */ 530 source = optarg; 531 break; 532 case 'v': 533 verbose++; 534 break; 535 case 'w': 536 ep = NULL; 537 waittime = strtoul(optarg, &ep, 0); 538 if (!*argv || *ep) { 539 Fprintf(stderr, 540 "traceroute6: invalid wait time.\n"); 541 exit(1); 542 } 543 if (waittime <= 1) { 544 Fprintf(stderr, 545 "traceroute6: wait must be >1 sec.\n"); 546 exit(1); 547 } 548 break; 549 default: 550 usage(); 551 } 552 argc -= optind; 553 argv += optind; 554 555 if (argc < 1 || argc > 2) 556 usage(); 557 558 #if 1 559 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 560 #else 561 setlinebuf (stdout); 562 #endif 563 564 memset(&hints, 0, sizeof(hints)); 565 hints.ai_family = PF_INET6; 566 hints.ai_socktype = SOCK_RAW; 567 hints.ai_protocol = IPPROTO_ICMPV6; 568 hints.ai_flags = AI_CANONNAME; 569 error = getaddrinfo(*argv, NULL, &hints, &res); 570 if (error) { 571 (void)fprintf(stderr, 572 "traceroute6: %s\n", gai_strerror(error)); 573 exit(1); 574 } 575 if (res->ai_addrlen != sizeof(Dst)) { 576 (void)fprintf(stderr, 577 "traceroute6: size of sockaddr mismatch\n"); 578 exit(1); 579 } 580 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 581 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 582 if (!hostname) { 583 (void)fprintf(stderr, "traceroute6: not enough core\n"); 584 exit(1); 585 } 586 587 if (*++argv) { 588 ep = NULL; 589 datalen = strtoul(*argv, &ep, 0); 590 if (!*argv || *ep) { 591 Fprintf(stderr, 592 "traceroute6: invalid packet length.\n"); 593 exit(1); 594 } 595 } 596 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 597 Fprintf(stderr, 598 "traceroute6: packet size must be 0 <= s < %ld.\n", 599 (long)(MAXPACKET - sizeof(struct opacket))); 600 exit(1); 601 } 602 datalen += sizeof(struct opacket); 603 outpacket = (struct opacket *)malloc((unsigned)datalen); 604 if (! outpacket) { 605 perror("malloc"); 606 exit(1); 607 } 608 (void) bzero((char *)outpacket, datalen); 609 610 /* initialize msghdr for receiving packets */ 611 rcviov[0].iov_base = (caddr_t)packet; 612 rcviov[0].iov_len = sizeof(packet); 613 rcvmhdr.msg_name = (caddr_t)&Rcv; 614 rcvmhdr.msg_namelen = sizeof(Rcv); 615 rcvmhdr.msg_iov = rcviov; 616 rcvmhdr.msg_iovlen = 1; 617 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 618 + CMSG_SPACE(sizeof(int)); 619 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 620 Fprintf(stderr, "traceroute6: malloc failed\n"); 621 exit(1); 622 } 623 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 624 rcvmhdr.msg_controllen = rcvcmsglen; 625 626 if (options & SO_DEBUG) 627 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 628 (char *)&on, sizeof(on)); 629 if (options & SO_DONTROUTE) 630 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 631 (char *)&on, sizeof(on)); 632 #ifdef IPSEC 633 #ifdef IPSEC_POLICY_IPSEC 634 /* 635 * do not raise error even if setsockopt fails, kernel may have ipsec 636 * turned off. 637 */ 638 if (setpolicy(rcvsock, "in bypass") < 0) 639 errx(1, "%s", ipsec_strerror()); 640 if (setpolicy(rcvsock, "out bypass") < 0) 641 errx(1, "%s", ipsec_strerror()); 642 #else 643 { 644 int level = IPSEC_LEVEL_NONE; 645 646 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 647 sizeof(level)); 648 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 649 sizeof(level)); 650 #ifdef IP_AUTH_TRANS_LEVEL 651 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 652 sizeof(level)); 653 #else 654 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 655 sizeof(level)); 656 #endif 657 #ifdef IP_AUTH_NETWORK_LEVEL 658 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 659 sizeof(level)); 660 #endif 661 } 662 #endif /*IPSEC_POLICY_IPSEC*/ 663 #endif /*IPSEC*/ 664 665 /* 666 * Send UDP 667 */ 668 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 669 perror("socket(SOCK_DGRAM)"); 670 exit(5); 671 } 672 #ifdef SO_SNDBUF 673 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 674 sizeof(datalen)) < 0) { 675 perror("setsockopt(SO_SNDBUF)"); 676 exit(6); 677 } 678 #endif /* SO_SNDBUF */ 679 if (options & SO_DEBUG) 680 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 681 (char *)&on, sizeof(on)); 682 if (options & SO_DONTROUTE) 683 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 684 (char *)&on, sizeof(on)); 685 #ifdef USE_RFC2292BIS 686 if (rth) {/* XXX: there is no library to finalize the header... */ 687 rth->ip6r_len = rth->ip6r_segleft * 2; 688 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 689 (void *)rth, (rth->ip6r_len + 1) << 3)) { 690 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 691 strerror(errno)); 692 exit(1); 693 } 694 } 695 #else /* old advanced API */ 696 if (cmsg != NULL) { 697 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 698 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 699 rtbuf, cmsg->cmsg_len) < 0) { 700 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 701 strerror(errno)); 702 exit(1); 703 } 704 } 705 #endif /* USE_RFC2292BIS */ 706 #ifdef IPSEC 707 #ifdef IPSEC_POLICY_IPSEC 708 /* 709 * do not raise error even if setsockopt fails, kernel may have ipsec 710 * turned off. 711 */ 712 if (setpolicy(sndsock, "in bypass") < 0) 713 errx(1, "%s", ipsec_strerror()); 714 if (setpolicy(sndsock, "out bypass") < 0) 715 errx(1, "%s", ipsec_strerror()); 716 #else 717 { 718 int level = IPSEC_LEVEL_BYPASS; 719 720 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 721 sizeof(level)); 722 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 723 sizeof(level)); 724 #ifdef IP_AUTH_TRANS_LEVEL 725 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 726 sizeof(level)); 727 #else 728 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 729 sizeof(level)); 730 #endif 731 #ifdef IP_AUTH_NETWORK_LEVEL 732 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 733 sizeof(level)); 734 #endif 735 } 736 #endif /*IPSEC_POLICY_IPSEC*/ 737 #endif /*IPSEC*/ 738 739 /* 740 * Source selection 741 */ 742 bzero(&Src, sizeof(Src)); 743 if (source) { 744 struct addrinfo hints, *res; 745 int error; 746 747 memset(&hints, 0, sizeof(hints)); 748 hints.ai_family = AF_INET6; 749 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 750 hints.ai_flags = AI_NUMERICHOST; 751 error = getaddrinfo(source, "0", &hints, &res); 752 if (error) { 753 Printf("traceroute6: %s: %s\n", source, 754 gai_strerror(error)); 755 exit(1); 756 } 757 if (res->ai_addrlen > sizeof(Src)) { 758 Printf("traceroute6: %s: %s\n", source, 759 gai_strerror(error)); 760 exit(1); 761 } 762 memcpy(&Src, res->ai_addr, res->ai_addrlen); 763 freeaddrinfo(res); 764 } else { 765 struct sockaddr_in6 Nxt; 766 int dummy, len; 767 768 Nxt = Dst; 769 Nxt.sin6_port = htons(DUMMY_PORT); 770 if (cmsg != NULL) 771 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 772 sizeof(Nxt.sin6_addr)); 773 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 774 perror("socket"); 775 exit(1); 776 } 777 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 778 perror("connect"); 779 exit(1); 780 } 781 len = sizeof(Src); 782 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 783 perror("getsockname"); 784 exit(1); 785 } 786 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 787 src0, sizeof(src0), NULL, 0, 788 NI_NUMERICHOST | niflag)) { 789 Fprintf(stderr, "getnameinfo failed for source\n"); 790 exit(1); 791 } 792 source = src0; 793 close(dummy); 794 } 795 796 #if 1 797 ident = (getpid() & 0xffff) | 0x8000; 798 #else 799 ident = 0; /*let the kernel pick one*/ 800 #endif 801 Src.sin6_port = htons(ident); 802 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 803 perror("bind"); 804 exit(1); 805 } 806 807 if (ident == 0) { 808 int len; 809 810 len = sizeof(Src); 811 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 812 perror("getsockname"); 813 exit(1); 814 } 815 ident = 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 | niflag)) 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, 829 ", %d hops max, %d byte packets\n", 830 max_hops, datalen); 831 (void) fflush(stderr); 832 833 if (first_hop > 1) 834 Printf("Skipping %d intermediate hops\n", first_hop - 1); 835 836 /* 837 * Main loop 838 */ 839 for (hops = first_hop; hops <= max_hops; ++hops) { 840 struct in6_addr lastaddr; 841 int got_there = 0; 842 int unreachable = 0; 843 844 Printf("%2d ", hops); 845 bzero(&lastaddr, sizeof(lastaddr)); 846 for (probe = 0; probe < nprobes; ++probe) { 847 int cc; 848 struct timeval t1, t2; 849 struct timezone tz; 850 851 (void) gettimeofday(&t1, &tz); 852 send_probe(++seq, hops); 853 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 854 (void) gettimeofday(&t2, &tz); 855 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 856 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 857 &lastaddr)) { 858 print(&rcvmhdr, cc); 859 lastaddr = Rcv.sin6_addr; 860 } 861 Printf(" %g ms", deltaT(&t1, &t2)); 862 switch(i - 1) { 863 case ICMP6_DST_UNREACH_NOROUTE: 864 ++unreachable; 865 Printf(" !N"); 866 break; 867 case ICMP6_DST_UNREACH_ADMIN: 868 ++unreachable; 869 Printf(" !P"); 870 break; 871 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 872 ++unreachable; 873 Printf(" !S"); 874 break; 875 case ICMP6_DST_UNREACH_ADDR: 876 ++unreachable; 877 Printf(" !A"); 878 break; 879 case ICMP6_DST_UNREACH_NOPORT: 880 if (rcvhlim >= 0 && 881 rcvhlim <= 1) 882 Printf(" !"); 883 ++got_there; 884 break; 885 } 886 break; 887 } 888 } 889 if (cc == 0) 890 Printf(" *"); 891 (void) fflush(stdout); 892 } 893 putchar('\n'); 894 if (got_there || 895 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 896 exit(0); 897 } 898 } 899 900 exit(0); 901 } 902 903 int 904 wait_for_reply(sock, mhdr) 905 int sock; 906 struct msghdr *mhdr; 907 { 908 #ifdef HAVE_POLL 909 struct pollfd pfd[1]; 910 int cc = 0; 911 912 pfd[0].fd = sock; 913 pfd[0].events = POLLIN; 914 pfd[0].revents = 0; 915 916 if (poll(pfd, 1, waittime * 1000) > 0) 917 cc = recvmsg(rcvsock, mhdr, 0); 918 919 return(cc); 920 #else 921 fd_set *fdsp; 922 struct timeval wait; 923 int cc = 0, fdsn; 924 925 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 926 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 927 err(1, "malloc"); 928 memset(fdsp, 0, fdsn); 929 FD_SET(sock, fdsp); 930 wait.tv_sec = waittime; wait.tv_usec = 0; 931 932 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 933 cc = recvmsg(rcvsock, mhdr, 0); 934 935 free(fdsp); 936 return(cc); 937 #endif 938 } 939 940 #ifdef IPSEC 941 #ifdef IPSEC_POLICY_IPSEC 942 int 943 setpolicy(so, policy) 944 int so; 945 char *policy; 946 { 947 char *buf; 948 949 buf = ipsec_set_policy(policy, strlen(policy)); 950 if (buf == NULL) { 951 warnx("%s", ipsec_strerror()); 952 return -1; 953 } 954 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 955 buf, ipsec_get_policylen(buf)); 956 957 free(buf); 958 959 return 0; 960 } 961 #endif 962 #endif 963 964 void 965 send_probe(seq, hops) 966 int seq, hops; 967 { 968 struct opacket *op = outpacket; 969 int i; 970 971 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 972 (char *)&hops, sizeof(hops)) < 0) { 973 perror("setsockopt IPV6_UNICAST_HOPS"); 974 } 975 976 Dst.sin6_port = htons(port + seq); 977 978 op->seq = seq; 979 op->hops = hops; 980 (void) gettimeofday(&op->tv, &tz); 981 982 i = sendto(sndsock, (char *)outpacket, datalen , 0, 983 (struct sockaddr *)&Dst, Dst.sin6_len); 984 if (i < 0 || i != datalen) { 985 if (i<0) 986 perror("sendto"); 987 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 988 datalen, i); 989 (void) fflush(stdout); 990 } 991 } 992 993 int 994 get_hoplim(mhdr) 995 struct msghdr *mhdr; 996 { 997 struct cmsghdr *cm; 998 999 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1000 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1001 if (cm->cmsg_level == IPPROTO_IPV6 && 1002 cm->cmsg_type == IPV6_HOPLIMIT && 1003 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1004 return(*(int *)CMSG_DATA(cm)); 1005 } 1006 1007 return(-1); 1008 } 1009 1010 double 1011 deltaT(t1p, t2p) 1012 struct timeval *t1p, *t2p; 1013 { 1014 register double dt; 1015 1016 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1017 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1018 return (dt); 1019 } 1020 1021 1022 /* 1023 * Convert an ICMP "type" field to a printable string. 1024 */ 1025 char * 1026 pr_type(t0) 1027 int t0; 1028 { 1029 u_char t = t0 & 0xff; 1030 char *cp; 1031 1032 switch (t) { 1033 case ICMP6_DST_UNREACH: 1034 cp = "Destination Unreachable"; 1035 break; 1036 case ICMP6_PACKET_TOO_BIG: 1037 cp = "Pakcet Too Big"; 1038 break; 1039 case ICMP6_TIME_EXCEEDED: 1040 cp = "Time Exceeded"; 1041 break; 1042 case ICMP6_PARAM_PROB: 1043 cp = "Parameter Problem"; 1044 break; 1045 case ICMP6_ECHO_REQUEST: 1046 cp = "Echo Request"; 1047 break; 1048 case ICMP6_ECHO_REPLY: 1049 cp = "Echo Reply"; 1050 break; 1051 case ICMP6_MEMBERSHIP_QUERY: 1052 cp = "Group Membership Query"; 1053 break; 1054 case ICMP6_MEMBERSHIP_REPORT: 1055 cp = "Group Membership Report"; 1056 break; 1057 case ICMP6_MEMBERSHIP_REDUCTION: 1058 cp = "Group Membership Reduction"; 1059 break; 1060 case ND_ROUTER_SOLICIT: 1061 cp = "Router Solicitation"; 1062 break; 1063 case ND_ROUTER_ADVERT: 1064 cp = "Router Advertisement"; 1065 break; 1066 case ND_NEIGHBOR_SOLICIT: 1067 cp = "Neighbor Solicitation"; 1068 break; 1069 case ND_NEIGHBOR_ADVERT: 1070 cp = "Neighbor Advertisement"; 1071 break; 1072 case ND_REDIRECT: 1073 cp = "Redirect"; 1074 break; 1075 default: 1076 cp = "Unknown"; 1077 break; 1078 } 1079 return cp; 1080 } 1081 1082 1083 int 1084 packet_ok(mhdr, cc, seq) 1085 struct msghdr *mhdr; 1086 int cc; 1087 int seq; 1088 { 1089 register struct icmp6_hdr *icp; 1090 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1091 u_char type, code; 1092 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1093 struct cmsghdr *cm; 1094 int *hlimp; 1095 char hbuf[NI_MAXHOST]; 1096 1097 #ifdef OLDRAWSOCKET 1098 int hlen; 1099 struct ip6_hdr *ip; 1100 #endif 1101 1102 #ifdef OLDRAWSOCKET 1103 ip = (struct ip6_hdr *) buf; 1104 hlen = sizeof(struct ip6_hdr); 1105 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1106 if (verbose) { 1107 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1108 hbuf, sizeof(hbuf), NULL, 0, 1109 NI_NUMERICHOST | niflag) != 0) 1110 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1111 Printf("packet too short (%d bytes) from %s\n", cc, 1112 hbuf); 1113 } 1114 return (0); 1115 } 1116 cc -= hlen; 1117 icp = (struct icmp6_hdr *)(buf + hlen); 1118 #else 1119 if (cc < sizeof(struct icmp6_hdr)) { 1120 if (verbose) { 1121 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1122 hbuf, sizeof(hbuf), NULL, 0, 1123 NI_NUMERICHOST | niflag) != 0) 1124 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1125 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1126 } 1127 return(0); 1128 } 1129 icp = (struct icmp6_hdr *)buf; 1130 #endif 1131 /* get optional information via advanced API */ 1132 rcvpktinfo = NULL; 1133 hlimp = NULL; 1134 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1135 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1136 if (cm->cmsg_level == IPPROTO_IPV6 && 1137 cm->cmsg_type == IPV6_PKTINFO && 1138 cm->cmsg_len == 1139 CMSG_LEN(sizeof(struct in6_pktinfo))) 1140 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1141 1142 if (cm->cmsg_level == IPPROTO_IPV6 && 1143 cm->cmsg_type == IPV6_HOPLIMIT && 1144 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1145 hlimp = (int *)CMSG_DATA(cm); 1146 } 1147 if (rcvpktinfo == NULL || hlimp == NULL) { 1148 warnx("failed to get received hop limit or packet info"); 1149 #if 0 1150 return(0); 1151 #else 1152 rcvhlim = 0; /*XXX*/ 1153 #endif 1154 } 1155 else 1156 rcvhlim = *hlimp; 1157 1158 type = icp->icmp6_type; 1159 code = icp->icmp6_code; 1160 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1161 || type == ICMP6_DST_UNREACH) { 1162 struct ip6_hdr *hip; 1163 struct udphdr *up; 1164 1165 hip = (struct ip6_hdr *)(icp + 1); 1166 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1167 if (verbose) 1168 warnx("failed to get upper layer header"); 1169 return(0); 1170 } 1171 if (up->uh_sport == htons(ident) && 1172 up->uh_dport == htons(port+seq)) 1173 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1174 } 1175 if (verbose) { 1176 int i; 1177 u_int8_t *p; 1178 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1179 1180 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1181 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1182 strlcpy(sbuf, "invalid", sizeof(hbuf)); 1183 Printf("\n%d bytes from %s to %s", cc, sbuf, 1184 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1185 dbuf, sizeof(dbuf)) 1186 : "?"); 1187 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1188 icp->icmp6_code); 1189 p = (u_int8_t *)(icp + 1); 1190 #define WIDTH 16 1191 for (i = 0; i < cc; i++) { 1192 if (i % WIDTH == 0) 1193 Printf("%04x:", i); 1194 if (i % 4 == 0) 1195 Printf(" "); 1196 Printf("%02x", p[i]); 1197 if (i % WIDTH == WIDTH - 1) 1198 Printf("\n"); 1199 } 1200 if (cc % WIDTH != 0) 1201 Printf("\n"); 1202 } 1203 return(0); 1204 } 1205 1206 /* 1207 * Increment pointer until find the UDP header. 1208 */ 1209 struct udphdr * 1210 get_udphdr(ip6, lim) 1211 struct ip6_hdr *ip6; 1212 u_char *lim; 1213 { 1214 u_char *cp = (u_char *)ip6, nh; 1215 int hlen; 1216 1217 if (cp + sizeof(*ip6) >= lim) 1218 return(NULL); 1219 1220 nh = ip6->ip6_nxt; 1221 cp += sizeof(struct ip6_hdr); 1222 1223 while(lim - cp >= 8) { 1224 switch(nh) { 1225 case IPPROTO_ESP: 1226 case IPPROTO_TCP: 1227 case IPPROTO_ICMPV6: 1228 return(NULL); 1229 case IPPROTO_UDP: 1230 return((struct udphdr *)cp); 1231 case IPPROTO_FRAGMENT: 1232 hlen = sizeof(struct ip6_frag); 1233 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1234 break; 1235 case IPPROTO_AH: 1236 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1237 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1238 break; 1239 default: 1240 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1241 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1242 break; 1243 } 1244 1245 cp += hlen; 1246 } 1247 1248 return(NULL); 1249 } 1250 1251 void 1252 print(mhdr, cc) 1253 struct msghdr *mhdr; 1254 int cc; 1255 { 1256 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1257 char hbuf[NI_MAXHOST]; 1258 1259 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1260 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1261 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1262 if (nflag) 1263 Printf(" %s", hbuf); 1264 else if (lflag) 1265 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1266 else 1267 Printf(" %s", inetname((struct sockaddr *)from)); 1268 1269 if (verbose) { 1270 #ifdef OLDRAWSOCKET 1271 Printf(" %d bytes to %s", cc, 1272 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1273 hbuf, sizeof(hbuf)) 1274 : "?"); 1275 #else 1276 Printf(" %d bytes of data to %s", cc, 1277 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1278 hbuf, sizeof(hbuf)) 1279 : "?"); 1280 #endif 1281 } 1282 } 1283 1284 /* 1285 * Subtract 2 timeval structs: out = out - in. 1286 * Out is assumed to be >= in. 1287 */ 1288 void 1289 tvsub(out, in) 1290 register struct timeval *out, *in; 1291 { 1292 if ((out->tv_usec -= in->tv_usec) < 0) { 1293 out->tv_sec--; 1294 out->tv_usec += 1000000; 1295 } 1296 out->tv_sec -= in->tv_sec; 1297 } 1298 1299 1300 /* 1301 * Construct an Internet address representation. 1302 * If the nflag has been supplied, give 1303 * numeric value, otherwise try for symbolic name. 1304 */ 1305 const char * 1306 inetname(sa) 1307 struct sockaddr *sa; 1308 { 1309 register char *cp; 1310 static char line[NI_MAXHOST]; 1311 static char domain[MAXHOSTNAMELEN + 1]; 1312 static int first = 1; 1313 1314 if (first && !nflag) { 1315 first = 0; 1316 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1317 (cp = index(domain, '.'))) 1318 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1319 else 1320 domain[0] = 0; 1321 } 1322 cp = NULL; 1323 if (!nflag) { 1324 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1325 NI_NAMEREQD) == 0) { 1326 if ((cp = index(line, '.')) && 1327 !strcmp(cp + 1, domain)) 1328 *cp = 0; 1329 cp = line; 1330 } 1331 } 1332 if (cp) 1333 return cp; 1334 1335 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1336 NI_NUMERICHOST | niflag) != 0) 1337 strlcpy(line, "invalid", sizeof(line)); 1338 return line; 1339 } 1340 1341 void 1342 usage() 1343 { 1344 (void)fprintf(stderr, 1345 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1346 " [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1347 exit(1); 1348 } 1349