1 /* $KAME: traceroute6.c,v 1.68 2004/01/25 11:16:12 suz 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 32 /*- 33 * Copyright (c) 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Van Jacobson. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 * 67 * "@(#) Copyright (c) 1990, 1993 68 * The Regents of the University of California. All rights reserved. 69 * 70 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.22 2008/02/10 21:06:38 dwmalone Exp $ 71 * $DragonFly: src/usr.sbin/traceroute6/traceroute6.c,v 1.9 2008/09/04 09:08:22 hasso Exp $ 72 */ 73 74 /* 75 * traceroute host - trace the route ip packets follow going to "host". 76 * 77 * Attempt to trace the route an ip packet would follow to some 78 * internet host. We find out intermediate hops by launching probe 79 * packets with a small ttl (time to live) then listening for an 80 * icmp "time exceeded" reply from a gateway. We start our probes 81 * with a ttl of one and increase by one until we get an icmp "port 82 * unreachable" (which means we got to "host") or hit a max (which 83 * defaults to 30 hops & can be changed with the -m flag). Three 84 * probes (change with -q flag) are sent at each ttl setting and a 85 * line is printed showing the ttl, address of the gateway and 86 * round trip time of each probe. If the probe answers come from 87 * different gateways, the address of each responding system will 88 * be printed. If there is no response within a 5 sec. timeout 89 * interval (changed with the -w flag), a "*" is printed for that 90 * probe. 91 * 92 * Probe packets are UDP format. We don't want the destination 93 * host to process them so the destination port is set to an 94 * unlikely value (if some clod on the destination is using that 95 * value, it can be changed with the -p flag). 96 * 97 * A sample use might be: 98 * 99 * [yak 71]% traceroute nis.nsf.net. 100 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 101 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 102 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 103 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 104 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 105 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 106 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 107 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 108 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 109 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 110 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 111 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 112 * 113 * Note that lines 2 & 3 are the same. This is due to a buggy 114 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 115 * packets with a zero ttl. 116 * 117 * A more interesting example is: 118 * 119 * [yak 72]% traceroute allspice.lcs.mit.edu. 120 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 121 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 122 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 123 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 124 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 125 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 126 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 127 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 128 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 129 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 130 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 131 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 132 * 12 * * * 133 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 134 * 14 * * * 135 * 15 * * * 136 * 16 * * * 137 * 17 * * * 138 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 139 * 140 * (I start to see why I'm having so much trouble with mail to 141 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 142 * either don't send ICMP "time exceeded" messages or send them 143 * with a ttl too small to reach us. 14 - 17 are running the 144 * MIT C Gateway code that doesn't send "time exceeded"s. God 145 * only knows what's going on with 12. 146 * 147 * The silent gateway 12 in the above may be the result of a bug in 148 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 149 * sends an unreachable message using whatever ttl remains in the 150 * original datagram. Since, for gateways, the remaining ttl is 151 * zero, the icmp "time exceeded" is guaranteed to not make it back 152 * to us. The behavior of this bug is slightly more interesting 153 * when it appears on the destination system: 154 * 155 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 156 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 157 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 158 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 159 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 160 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 161 * 7 * * * 162 * 8 * * * 163 * 9 * * * 164 * 10 * * * 165 * 11 * * * 166 * 12 * * * 167 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 168 * 169 * Notice that there are 12 "gateways" (13 is the final 170 * destination) and exactly the last half of them are "missing". 171 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 172 * is using the ttl from our arriving datagram as the ttl in its 173 * icmp reply. So, the reply will time out on the return path 174 * (with no notice sent to anyone since icmp's aren't sent for 175 * icmp's) until we probe with a ttl that's at least twice the path 176 * length. I.e., rip is really only 7 hops away. A reply that 177 * returns with a ttl of 1 is a clue this problem exists. 178 * Traceroute prints a "!" after the time if the ttl is <= 1. 179 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 180 * non-standard (HPUX) software, expect to see this problem 181 * frequently and/or take care picking the target host of your 182 * probes. 183 * 184 * Other possible annotations after the time are !H, !N, !P (got a host, 185 * network or protocol unreachable, respectively), !S or !F (source 186 * route failed or fragmentation needed -- neither of these should 187 * ever occur and the associated gateway is busted if you see one). If 188 * almost all the probes result in some kind of unreachable, traceroute 189 * will give up and exit. 190 * 191 * Notes 192 * ----- 193 * This program must be run by root or be setuid. (I suggest that 194 * you *don't* make it setuid -- casual use could result in a lot 195 * of unnecessary traffic on our poor, congested nets.) 196 * 197 * This program requires a kernel mod that does not appear in any 198 * system available from Berkeley: A raw ip socket using proto 199 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 200 * opposed to data to be wrapped in an ip datagram). See the README 201 * file that came with the source to this program for a description 202 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 203 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 204 * MODIFIED TO RUN THIS PROGRAM. 205 * 206 * The udp port usage may appear bizarre (well, ok, it is bizarre). 207 * The problem is that an icmp message only contains 8 bytes of 208 * data from the original datagram. 8 bytes is the size of a udp 209 * header so, if we want to associate replies with the original 210 * datagram, the necessary information must be encoded into the 211 * udp header (the ip id could be used but there's no way to 212 * interlock with the kernel's assignment of ip id's and, anyway, 213 * it would have taken a lot more kernel hacking to allow this 214 * code to set the ip id). So, to allow two or more users to 215 * use traceroute simultaneously, we use this task's pid as the 216 * source port (the high bit is set to move the port number out 217 * of the "likely" range). To keep track of which probe is being 218 * replied to (so times and/or hop counts don't get confused by a 219 * reply that was delayed in transit), we increment the destination 220 * port number before each probe. 221 * 222 * Don't use this as a coding example. I was trying to find a 223 * routing problem and this code sort-of popped out after 48 hours 224 * without sleep. I was amazed it ever compiled, much less ran. 225 * 226 * I stole the idea for this program from Steve Deering. Since 227 * the first release, I've learned that had I attended the right 228 * IETF working group meetings, I also could have stolen it from Guy 229 * Almes or Matt Mathis. I don't know (or care) who came up with 230 * the idea first. I envy the originators' perspicacity and I'm 231 * glad they didn't keep the idea a secret. 232 * 233 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 234 * enhancements to the original distribution. 235 * 236 * I've hacked up a round-trip-route version of this that works by 237 * sending a loose-source-routed udp datagram through the destination 238 * back to yourself. Unfortunately, SO many gateways botch source 239 * routing, the thing is almost worthless. Maybe one day... 240 * 241 * -- Van Jacobson (van@helios.ee.lbl.gov) 242 * Tue Dec 20 03:50:13 PST 1988 243 */ 244 245 #include <sys/param.h> 246 #include <sys/time.h> 247 #include <sys/socket.h> 248 #include <sys/uio.h> 249 #include <sys/file.h> 250 #include <sys/ioctl.h> 251 #include <sys/sysctl.h> 252 253 #include <netinet/in.h> 254 255 #include <arpa/inet.h> 256 257 #include <netdb.h> 258 #include <stdio.h> 259 #include <err.h> 260 #ifdef HAVE_POLL 261 #include <poll.h> 262 #endif 263 #include <errno.h> 264 #include <stdlib.h> 265 #include <string.h> 266 #include <unistd.h> 267 268 #include <netinet/ip6.h> 269 #include <netinet/icmp6.h> 270 #include <netinet/udp.h> 271 272 #ifdef IPSEC 273 #include <net/route.h> 274 #include <netinet6/ipsec.h> 275 #endif 276 277 #define DUMMY_PORT 10010 278 279 #define MAXPACKET 65535 /* max ip packet size */ 280 281 #ifndef HAVE_GETIPNODEBYNAME 282 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 283 #define freehostent(x) 284 #endif 285 286 /* 287 * format of a (udp) probe packet. 288 */ 289 struct tv32 { 290 u_int32_t tv32_sec; 291 u_int32_t tv32_usec; 292 }; 293 294 struct opacket { 295 u_char seq; /* sequence number of this packet */ 296 u_char hops; /* hop limit of the packet */ 297 u_char pad[2]; 298 struct tv32 tv; /* time packet left */ 299 } __attribute__((__packed__)); 300 301 u_char packet[512]; /* last inbound (icmp) packet */ 302 struct opacket *outpacket; /* last output (udp) packet */ 303 304 int main(int, char *[]); 305 int wait_for_reply(int, struct msghdr *); 306 #ifdef IPSEC 307 #ifdef IPSEC_POLICY_IPSEC 308 int setpolicy(int so, char *policy); 309 #endif 310 #endif 311 void send_probe(int, u_long); 312 void *get_uphdr(struct ip6_hdr *, u_char *); 313 int get_hoplim(struct msghdr *); 314 double deltaT(struct timeval *, struct timeval *); 315 char *pr_type(int); 316 int packet_ok(struct msghdr *, int, int); 317 void print(struct msghdr *, int); 318 const char *inetname(struct sockaddr *); 319 void usage(void); 320 321 int rcvsock; /* receive (icmp) socket file descriptor */ 322 int sndsock; /* send (udp) socket file descriptor */ 323 324 struct msghdr rcvmhdr; 325 struct iovec rcviov[2]; 326 int rcvhlim; 327 struct in6_pktinfo *rcvpktinfo; 328 329 struct sockaddr_in6 Src, Dst, Rcv; 330 u_long datalen; /* How much data */ 331 #define ICMP6ECHOLEN 8 332 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 333 char rtbuf[2064]; 334 335 char *source = 0; 336 char *hostname; 337 338 u_long nprobes = 3; 339 u_long first_hop = 1; 340 u_long max_hops = 30; 341 u_int16_t srcport; 342 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 343 u_int16_t ident; 344 int options; /* socket options */ 345 int verbose; 346 int waittime = 5; /* time to wait for response (in seconds) */ 347 int nflag; /* print addresses numerically */ 348 int useproto = IPPROTO_UDP; /* protocol to use to send packet */ 349 int lflag; /* print both numerical address & hostname */ 350 351 int 352 main(int argc, char **argv) 353 { 354 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 355 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 356 int ch, i, on = 1, seq, rcvcmsglen, error, minlen; 357 struct addrinfo hints, *res; 358 static u_char *rcvcmsgbuf; 359 u_long probe, hops, lport; 360 struct hostent *hp; 361 size_t size; 362 uid_t uid; 363 364 /* 365 * Receive ICMP 366 */ 367 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 368 perror("socket(ICMPv6)"); 369 exit(5); 370 } 371 372 size = sizeof(i); 373 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 374 max_hops = i; 375 376 /* specify to tell receiving interface */ 377 #ifdef IPV6_RECVPKTINFO 378 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 379 sizeof(on)) < 0) 380 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 381 #else /* old adv. API */ 382 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 383 sizeof(on)) < 0) 384 err(1, "setsockopt(IPV6_PKTINFO)"); 385 #endif 386 387 /* specify to tell value of hoplimit field of received IP6 hdr */ 388 #ifdef IPV6_RECVHOPLIMIT 389 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 390 sizeof(on)) < 0) 391 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 392 #else /* old adv. API */ 393 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 394 sizeof(on)) < 0) 395 err(1, "setsockopt(IPV6_HOPLIMIT)"); 396 #endif 397 398 seq = 0; 399 400 while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1) 401 switch (ch) { 402 case 'd': 403 options |= SO_DEBUG; 404 break; 405 case 'f': 406 ep = NULL; 407 errno = 0; 408 first_hop = strtoul(optarg, &ep, 0); 409 if (errno || !*optarg || *ep || first_hop > 255) { 410 fprintf(stderr, 411 "traceroute6: invalid min hoplimit.\n"); 412 exit(1); 413 } 414 break; 415 case 'g': 416 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 417 if (hp == NULL) { 418 fprintf(stderr, 419 "traceroute6: unknown host %s\n", optarg); 420 exit(1); 421 } 422 freehostent(hp); 423 break; 424 case 'I': 425 useproto = IPPROTO_ICMPV6; 426 ident = htons(getpid() & 0xffff); /* same as ping6 */ 427 break; 428 case 'l': 429 lflag++; 430 break; 431 case 'm': 432 ep = NULL; 433 errno = 0; 434 max_hops = strtoul(optarg, &ep, 0); 435 if (errno || !*optarg || *ep || max_hops > 255) { 436 fprintf(stderr, 437 "traceroute6: invalid max hoplimit.\n"); 438 exit(1); 439 } 440 break; 441 case 'n': 442 nflag++; 443 break; 444 case 'N': 445 useproto = IPPROTO_NONE; 446 break; 447 case 'p': 448 ep = NULL; 449 errno = 0; 450 lport = strtoul(optarg, &ep, 0); 451 if (errno || !*optarg || *ep) { 452 fprintf(stderr, "traceroute6: invalid port.\n"); 453 exit(1); 454 } 455 if (lport == 0 || lport != (lport & 0xffff)) { 456 fprintf(stderr, 457 "traceroute6: port out of range.\n"); 458 exit(1); 459 } 460 port = lport & 0xffff; 461 break; 462 case 'q': 463 ep = NULL; 464 errno = 0; 465 nprobes = strtoul(optarg, &ep, 0); 466 if (errno || !*optarg || *ep) { 467 fprintf(stderr, 468 "traceroute6: invalid nprobes.\n"); 469 exit(1); 470 } 471 if (nprobes < 1) { 472 fprintf(stderr, 473 "traceroute6: nprobes must be >0.\n"); 474 exit(1); 475 } 476 break; 477 case 'r': 478 options |= SO_DONTROUTE; 479 break; 480 case 's': 481 /* 482 * set the ip source address of the outbound 483 * probe (e.g., on a multi-homed host). 484 */ 485 source = optarg; 486 break; 487 case 'v': 488 verbose++; 489 break; 490 case 'U': 491 useproto = IPPROTO_UDP; 492 break; 493 case 'w': 494 ep = NULL; 495 errno = 0; 496 waittime = strtoul(optarg, &ep, 0); 497 if (errno || !*optarg || *ep) { 498 fprintf(stderr, 499 "traceroute6: invalid wait time.\n"); 500 exit(1); 501 } 502 if (waittime < 1) { 503 fprintf(stderr, 504 "traceroute6: wait must be >= 1 sec.\n"); 505 exit(1); 506 } 507 break; 508 default: 509 usage(); 510 } 511 argc -= optind; 512 argv += optind; 513 514 /* 515 * Open socket to send probe packets. 516 */ 517 switch (useproto) { 518 case IPPROTO_ICMPV6: 519 sndsock = rcvsock; 520 break; 521 case IPPROTO_UDP: 522 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 523 perror("socket(SOCK_DGRAM)"); 524 exit(5); 525 } 526 break; 527 case IPPROTO_NONE: 528 if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) { 529 perror("socket(SOCK_RAW)"); 530 exit(5); 531 } 532 break; 533 default: 534 fprintf(stderr, "traceroute6: unknown probe protocol %d", 535 useproto); 536 exit(5); 537 } 538 if (max_hops < first_hop) { 539 fprintf(stderr, 540 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 541 exit(1); 542 } 543 544 /* revoke privs */ 545 uid = getuid(); 546 if (setresuid(uid, uid, uid) == -1) { 547 perror("setresuid"); 548 exit(1); 549 } 550 551 552 if (argc < 1 || argc > 2) 553 usage(); 554 555 #if 1 556 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 557 #else 558 setlinebuf(stdout); 559 #endif 560 561 memset(&hints, 0, sizeof(hints)); 562 hints.ai_family = PF_INET6; 563 hints.ai_socktype = SOCK_RAW; 564 hints.ai_protocol = IPPROTO_ICMPV6; 565 hints.ai_flags = AI_CANONNAME; 566 error = getaddrinfo(*argv, NULL, &hints, &res); 567 if (error) { 568 fprintf(stderr, 569 "traceroute6: %s\n", gai_strerror(error)); 570 exit(1); 571 } 572 if (res->ai_addrlen != sizeof(Dst)) { 573 fprintf(stderr, 574 "traceroute6: size of sockaddr mismatch\n"); 575 exit(1); 576 } 577 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 578 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 579 if (!hostname) { 580 fprintf(stderr, "traceroute6: not enough core\n"); 581 exit(1); 582 } 583 if (res->ai_next) { 584 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 585 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 586 strlcpy(hbuf, "?", sizeof(hbuf)); 587 fprintf(stderr, "traceroute6: Warning: %s has multiple " 588 "addresses; using %s\n", hostname, hbuf); 589 } 590 591 if (*++argv) { 592 ep = NULL; 593 errno = 0; 594 datalen = strtoul(*argv, &ep, 0); 595 if (errno || !*argv || *ep) { 596 fprintf(stderr, 597 "traceroute6: invalid packet length.\n"); 598 exit(1); 599 } 600 } 601 switch (useproto) { 602 case IPPROTO_ICMPV6: 603 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 604 break; 605 case IPPROTO_UDP: 606 minlen = sizeof(struct opacket); 607 break; 608 case IPPROTO_NONE: 609 minlen = 0; 610 datalen = 0; 611 break; 612 default: 613 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n", 614 useproto); 615 exit(1); 616 } 617 if (datalen < minlen) 618 datalen = minlen; 619 else if (datalen >= MAXPACKET) { 620 fprintf(stderr, 621 "traceroute6: packet size must be %d <= s < %ld.\n", 622 minlen, (long)MAXPACKET); 623 exit(1); 624 } 625 outpacket = (struct opacket *)malloc((unsigned)datalen); 626 if (!outpacket) { 627 perror("malloc"); 628 exit(1); 629 } 630 (void) bzero((char *)outpacket, datalen); 631 632 /* initialize msghdr for receiving packets */ 633 rcviov[0].iov_base = (caddr_t)packet; 634 rcviov[0].iov_len = sizeof(packet); 635 rcvmhdr.msg_name = (caddr_t)&Rcv; 636 rcvmhdr.msg_namelen = sizeof(Rcv); 637 rcvmhdr.msg_iov = rcviov; 638 rcvmhdr.msg_iovlen = 1; 639 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 640 CMSG_SPACE(sizeof(int)); 641 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 642 fprintf(stderr, "traceroute6: malloc failed\n"); 643 exit(1); 644 } 645 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 646 rcvmhdr.msg_controllen = rcvcmsglen; 647 648 if (options & SO_DEBUG) 649 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 650 (char *)&on, sizeof(on)); 651 if (options & SO_DONTROUTE) 652 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 653 (char *)&on, sizeof(on)); 654 #ifdef IPSEC 655 #ifdef IPSEC_POLICY_IPSEC 656 /* 657 * do not raise error even if setsockopt fails, kernel may have ipsec 658 * turned off. 659 */ 660 if (setpolicy(rcvsock, "in bypass") < 0) 661 errx(1, "%s", ipsec_strerror()); 662 if (setpolicy(rcvsock, "out bypass") < 0) 663 errx(1, "%s", ipsec_strerror()); 664 #else 665 { 666 int level = IPSEC_LEVEL_NONE; 667 668 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 669 sizeof(level)); 670 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 671 sizeof(level)); 672 #ifdef IP_AUTH_TRANS_LEVEL 673 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 674 sizeof(level)); 675 #else 676 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 677 sizeof(level)); 678 #endif 679 #ifdef IP_AUTH_NETWORK_LEVEL 680 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 681 sizeof(level)); 682 #endif 683 } 684 #endif /*IPSEC_POLICY_IPSEC*/ 685 #endif /*IPSEC*/ 686 687 #ifdef SO_SNDBUF 688 i = datalen; 689 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 690 sizeof(i)) < 0 && useproto != IPPROTO_NONE) { 691 perror("setsockopt(SO_SNDBUF)"); 692 exit(6); 693 } 694 #endif /* SO_SNDBUF */ 695 if (options & SO_DEBUG) 696 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 697 (char *)&on, sizeof(on)); 698 if (options & SO_DONTROUTE) 699 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 700 (char *)&on, sizeof(on)); 701 #ifdef IPSEC 702 #ifdef IPSEC_POLICY_IPSEC 703 /* 704 * do not raise error even if setsockopt fails, kernel may have ipsec 705 * turned off. 706 */ 707 if (setpolicy(sndsock, "in bypass") < 0) 708 errx(1, "%s", ipsec_strerror()); 709 if (setpolicy(sndsock, "out bypass") < 0) 710 errx(1, "%s", ipsec_strerror()); 711 #else 712 { 713 int level = IPSEC_LEVEL_BYPASS; 714 715 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 716 sizeof(level)); 717 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 718 sizeof(level)); 719 #ifdef IP_AUTH_TRANS_LEVEL 720 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 721 sizeof(level)); 722 #else 723 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 724 sizeof(level)); 725 #endif 726 #ifdef IP_AUTH_NETWORK_LEVEL 727 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 728 sizeof(level)); 729 #endif 730 } 731 #endif /*IPSEC_POLICY_IPSEC*/ 732 #endif /*IPSEC*/ 733 734 /* 735 * Source selection 736 */ 737 bzero(&Src, sizeof(Src)); 738 if (source) { 739 struct addrinfo hints, *res; 740 int error; 741 742 memset(&hints, 0, sizeof(hints)); 743 hints.ai_family = AF_INET6; 744 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 745 hints.ai_flags = AI_NUMERICHOST; 746 error = getaddrinfo(source, "0", &hints, &res); 747 if (error) { 748 printf("traceroute6: %s: %s\n", source, 749 gai_strerror(error)); 750 exit(1); 751 } 752 if (res->ai_addrlen > sizeof(Src)) { 753 printf("traceroute6: %s: %s\n", source, 754 gai_strerror(error)); 755 exit(1); 756 } 757 memcpy(&Src, res->ai_addr, res->ai_addrlen); 758 freeaddrinfo(res); 759 } else { 760 struct sockaddr_in6 Nxt; 761 int dummy; 762 socklen_t len; 763 764 Nxt = Dst; 765 Nxt.sin6_port = htons(DUMMY_PORT); 766 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 767 perror("socket"); 768 exit(1); 769 } 770 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 771 perror("connect"); 772 exit(1); 773 } 774 len = sizeof(Src); 775 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 776 perror("getsockname"); 777 exit(1); 778 } 779 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 780 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 781 fprintf(stderr, "getnameinfo failed for source\n"); 782 exit(1); 783 } 784 source = src0; 785 close(dummy); 786 } 787 788 Src.sin6_port = htons(0); 789 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 790 perror("bind"); 791 exit(1); 792 } 793 794 { 795 socklen_t len; 796 797 len = sizeof(Src); 798 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 799 perror("getsockname"); 800 exit(1); 801 } 802 srcport = ntohs(Src.sin6_port); 803 } 804 805 /* 806 * Message to users 807 */ 808 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 809 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 810 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 811 fprintf(stderr, "traceroute6"); 812 fprintf(stderr, " to %s (%s)", hostname, hbuf); 813 if (source) 814 fprintf(stderr, " from %s", source); 815 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 816 max_hops, datalen); 817 (void) fflush(stderr); 818 819 if (first_hop > 1) 820 printf("Skipping %lu intermediate hops\n", first_hop - 1); 821 822 /* 823 * Main loop 824 */ 825 for (hops = first_hop; hops <= max_hops; ++hops) { 826 struct in6_addr lastaddr; 827 int got_there = 0; 828 int unreachable = 0; 829 830 printf("%2lu ", hops); 831 bzero(&lastaddr, sizeof(lastaddr)); 832 for (probe = 0; probe < nprobes; ++probe) { 833 int cc; 834 struct timeval t1, t2; 835 836 (void) gettimeofday(&t1, NULL); 837 send_probe(++seq, hops); 838 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 839 (void) gettimeofday(&t2, NULL); 840 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 841 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 842 &lastaddr)) { 843 if (probe > 0) 844 fputs("\n ", stdout); 845 print(&rcvmhdr, cc); 846 lastaddr = Rcv.sin6_addr; 847 } 848 printf(" %.3f ms", deltaT(&t1, &t2)); 849 switch (i - 1) { 850 case ICMP6_DST_UNREACH_NOROUTE: 851 ++unreachable; 852 printf(" !N"); 853 break; 854 case ICMP6_DST_UNREACH_ADMIN: 855 ++unreachable; 856 printf(" !P"); 857 break; 858 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 859 ++unreachable; 860 printf(" !S"); 861 break; 862 case ICMP6_DST_UNREACH_ADDR: 863 ++unreachable; 864 printf(" !A"); 865 break; 866 case ICMP6_DST_UNREACH_NOPORT: 867 if (rcvhlim >= 0 && 868 rcvhlim <= 1) 869 printf(" !"); 870 ++got_there; 871 break; 872 } 873 break; 874 } 875 } 876 if (cc == 0) 877 printf(" *"); 878 (void) fflush(stdout); 879 } 880 putchar('\n'); 881 if (got_there || 882 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 883 exit(0); 884 } 885 } 886 887 exit(0); 888 } 889 890 int 891 wait_for_reply(int sock, 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, NULL, NULL, &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(int so, char *policy) 929 { 930 char *buf; 931 932 buf = ipsec_set_policy(policy, strlen(policy)); 933 if (buf == NULL) { 934 warnx("%s", ipsec_strerror()); 935 return -1; 936 } 937 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 938 buf, ipsec_get_policylen(buf)); 939 940 free(buf); 941 942 return 0; 943 } 944 #endif 945 #endif 946 947 void 948 send_probe(int seq, u_long hops) 949 { 950 struct icmp6_hdr *icp; 951 struct opacket *op; 952 struct timeval tv; 953 struct tv32 tv32; 954 int i; 955 956 i = hops; 957 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 958 (char *)&i, sizeof(i)) < 0) { 959 perror("setsockopt IPV6_UNICAST_HOPS"); 960 } 961 962 Dst.sin6_port = htons(port + seq); 963 (void) gettimeofday(&tv, NULL); 964 tv32.tv32_sec = htonl(tv.tv_sec); 965 tv32.tv32_usec = htonl(tv.tv_usec); 966 967 switch (useproto) { 968 case IPPROTO_ICMPV6: 969 icp = (struct icmp6_hdr *)outpacket; 970 971 icp->icmp6_type = ICMP6_ECHO_REQUEST; 972 icp->icmp6_code = 0; 973 icp->icmp6_cksum = 0; 974 icp->icmp6_id = ident; 975 icp->icmp6_seq = htons(seq); 976 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 977 sizeof(tv32)); 978 break; 979 case IPPROTO_UDP: 980 op = outpacket; 981 982 op->seq = seq; 983 op->hops = hops; 984 bcopy(&tv32, &op->tv, sizeof tv32); 985 break; 986 case IPPROTO_NONE: 987 /* No space for anything. No harm as seq/tv32 are decorative. */ 988 break; 989 default: 990 fprintf(stderr, "Unknown probe protocol %d.\n", useproto); 991 exit(1); 992 } 993 994 i = sendto(sndsock, (char *)outpacket, datalen, 0, 995 (struct sockaddr *)&Dst, Dst.sin6_len); 996 if (i < 0 || i != datalen) { 997 if (i < 0) 998 perror("sendto"); 999 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 1000 hostname, datalen, i); 1001 (void) fflush(stdout); 1002 } 1003 } 1004 1005 int 1006 get_hoplim(struct msghdr *mhdr) 1007 { 1008 struct cmsghdr *cm; 1009 1010 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1011 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1012 if (cm->cmsg_level == IPPROTO_IPV6 && 1013 cm->cmsg_type == IPV6_HOPLIMIT && 1014 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1015 return(*(int *)CMSG_DATA(cm)); 1016 } 1017 1018 return(-1); 1019 } 1020 1021 double 1022 deltaT(struct timeval *t1p, struct timeval *t2p) 1023 { 1024 double dt; 1025 1026 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1027 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1028 return (dt); 1029 } 1030 1031 /* 1032 * Convert an ICMP "type" field to a printable string. 1033 */ 1034 char * 1035 pr_type(int t0) 1036 { 1037 u_char t = t0 & 0xff; 1038 char *cp; 1039 1040 switch (t) { 1041 case ICMP6_DST_UNREACH: 1042 cp = "Destination Unreachable"; 1043 break; 1044 case ICMP6_PACKET_TOO_BIG: 1045 cp = "Packet Too Big"; 1046 break; 1047 case ICMP6_TIME_EXCEEDED: 1048 cp = "Time Exceeded"; 1049 break; 1050 case ICMP6_PARAM_PROB: 1051 cp = "Parameter Problem"; 1052 break; 1053 case ICMP6_ECHO_REQUEST: 1054 cp = "Echo Request"; 1055 break; 1056 case ICMP6_ECHO_REPLY: 1057 cp = "Echo Reply"; 1058 break; 1059 case ICMP6_MEMBERSHIP_QUERY: 1060 cp = "Group Membership Query"; 1061 break; 1062 case ICMP6_MEMBERSHIP_REPORT: 1063 cp = "Group Membership Report"; 1064 break; 1065 case ICMP6_MEMBERSHIP_REDUCTION: 1066 cp = "Group Membership Reduction"; 1067 break; 1068 case ND_ROUTER_SOLICIT: 1069 cp = "Router Solicitation"; 1070 break; 1071 case ND_ROUTER_ADVERT: 1072 cp = "Router Advertisement"; 1073 break; 1074 case ND_NEIGHBOR_SOLICIT: 1075 cp = "Neighbor Solicitation"; 1076 break; 1077 case ND_NEIGHBOR_ADVERT: 1078 cp = "Neighbor Advertisement"; 1079 break; 1080 case ND_REDIRECT: 1081 cp = "Redirect"; 1082 break; 1083 default: 1084 cp = "Unknown"; 1085 break; 1086 } 1087 return cp; 1088 } 1089 1090 int 1091 packet_ok(struct msghdr *mhdr, int cc, int seq) 1092 { 1093 struct icmp6_hdr *icp; 1094 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1095 u_char type, code; 1096 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1097 struct cmsghdr *cm; 1098 int *hlimp; 1099 char hbuf[NI_MAXHOST]; 1100 1101 #ifdef OLDRAWSOCKET 1102 int hlen; 1103 struct ip6_hdr *ip; 1104 #endif 1105 1106 #ifdef OLDRAWSOCKET 1107 ip = (struct ip6_hdr *) buf; 1108 hlen = sizeof(struct ip6_hdr); 1109 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1110 if (verbose) { 1111 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1112 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1113 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1114 printf("packet too short (%d bytes) from %s\n", cc, 1115 hbuf); 1116 } 1117 return (0); 1118 } 1119 cc -= hlen; 1120 icp = (struct icmp6_hdr *)(buf + hlen); 1121 #else 1122 if (cc < sizeof(struct icmp6_hdr)) { 1123 if (verbose) { 1124 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1125 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1126 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1127 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1128 } 1129 return(0); 1130 } 1131 icp = (struct icmp6_hdr *)buf; 1132 #endif 1133 /* get optional information via advanced API */ 1134 rcvpktinfo = NULL; 1135 hlimp = NULL; 1136 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1137 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1138 if (cm->cmsg_level == IPPROTO_IPV6 && 1139 cm->cmsg_type == IPV6_PKTINFO && 1140 cm->cmsg_len == 1141 CMSG_LEN(sizeof(struct in6_pktinfo))) 1142 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1143 1144 if (cm->cmsg_level == IPPROTO_IPV6 && 1145 cm->cmsg_type == IPV6_HOPLIMIT && 1146 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1147 hlimp = (int *)CMSG_DATA(cm); 1148 } 1149 if (rcvpktinfo == NULL || hlimp == NULL) { 1150 warnx("failed to get received hop limit or packet info"); 1151 #if 0 1152 return(0); 1153 #else 1154 rcvhlim = 0; /*XXX*/ 1155 #endif 1156 } 1157 else 1158 rcvhlim = *hlimp; 1159 1160 type = icp->icmp6_type; 1161 code = icp->icmp6_code; 1162 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1163 || type == ICMP6_DST_UNREACH) { 1164 struct ip6_hdr *hip; 1165 void *up; 1166 1167 hip = (struct ip6_hdr *)(icp + 1); 1168 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) { 1169 if (verbose) 1170 warnx("failed to get upper layer header"); 1171 return(0); 1172 } 1173 switch (useproto) { 1174 case IPPROTO_ICMPV6: 1175 if (((struct icmp6_hdr *)up)->icmp6_id == ident && 1176 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1177 return (type == ICMP6_TIME_EXCEEDED ? 1178 -1 : code + 1); 1179 break; 1180 case IPPROTO_UDP: 1181 if (((struct udphdr *)up)->uh_sport == htons(srcport) && 1182 ((struct udphdr *)up)->uh_dport == htons(port + seq)) 1183 return (type == ICMP6_TIME_EXCEEDED ? 1184 -1 : code + 1); 1185 break; 1186 case IPPROTO_NONE: 1187 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1188 default: 1189 fprintf(stderr, "Unknown probe proto %d.\n", useproto); 1190 break; 1191 } 1192 } else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) { 1193 if (icp->icmp6_id == ident && 1194 icp->icmp6_seq == htons(seq)) 1195 return (ICMP6_DST_UNREACH_NOPORT + 1); 1196 } 1197 if (verbose) { 1198 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1199 u_int8_t *p; 1200 int i; 1201 1202 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1203 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1204 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1205 printf("\n%d bytes from %s to %s", cc, sbuf, 1206 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1207 dbuf, sizeof(dbuf)) : "?"); 1208 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1209 icp->icmp6_code); 1210 p = (u_int8_t *)(icp + 1); 1211 #define WIDTH 16 1212 for (i = 0; i < cc; i++) { 1213 if (i % WIDTH == 0) 1214 printf("%04x:", i); 1215 if (i % 4 == 0) 1216 printf(" "); 1217 printf("%02x", p[i]); 1218 if (i % WIDTH == WIDTH - 1) 1219 printf("\n"); 1220 } 1221 if (cc % WIDTH != 0) 1222 printf("\n"); 1223 } 1224 return(0); 1225 } 1226 1227 /* 1228 * Increment pointer until find the UDP or ICMP header. 1229 */ 1230 void * 1231 get_uphdr(struct ip6_hdr *ip6, u_char *lim) 1232 { 1233 u_char *cp = (u_char *)ip6, nh; 1234 int hlen; 1235 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */ 1236 1237 if (cp + sizeof(*ip6) > lim) 1238 return(NULL); 1239 1240 nh = ip6->ip6_nxt; 1241 cp += sizeof(struct ip6_hdr); 1242 1243 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) { 1244 switch (nh) { 1245 case IPPROTO_ESP: 1246 case IPPROTO_TCP: 1247 return(NULL); 1248 case IPPROTO_ICMPV6: 1249 return(useproto == nh ? cp : NULL); 1250 case IPPROTO_UDP: 1251 return(useproto == nh ? cp : NULL); 1252 case IPPROTO_NONE: 1253 return(useproto == nh ? none_hdr : NULL); 1254 case IPPROTO_FRAGMENT: 1255 hlen = sizeof(struct ip6_frag); 1256 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1257 break; 1258 case IPPROTO_AH: 1259 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1260 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1261 break; 1262 default: 1263 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1264 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1265 break; 1266 } 1267 1268 cp += hlen; 1269 } 1270 1271 return(NULL); 1272 } 1273 1274 void 1275 print(struct msghdr *mhdr, int cc) 1276 { 1277 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1278 char hbuf[NI_MAXHOST]; 1279 1280 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1281 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1282 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1283 if (nflag) 1284 printf(" %s", hbuf); 1285 else if (lflag) 1286 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1287 else 1288 printf(" %s", inetname((struct sockaddr *)from)); 1289 1290 if (verbose) { 1291 #ifdef OLDRAWSOCKET 1292 printf(" %d bytes to %s", cc, 1293 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1294 hbuf, sizeof(hbuf)) : "?"); 1295 #else 1296 printf(" %d bytes of data to %s", cc, 1297 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1298 hbuf, sizeof(hbuf)) : "?"); 1299 #endif 1300 } 1301 } 1302 1303 /* 1304 * Construct an Internet address representation. 1305 * If the nflag has been supplied, give 1306 * numeric value, otherwise try for symbolic name. 1307 */ 1308 const char * 1309 inetname(struct sockaddr *sa) 1310 { 1311 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1312 static int first = 1; 1313 char *cp; 1314 1315 if (first && !nflag) { 1316 first = 0; 1317 if (gethostname(domain, sizeof(domain)) == 0 && 1318 (cp = strchr(domain, '.'))) 1319 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1320 else 1321 domain[0] = 0; 1322 } 1323 cp = NULL; 1324 if (!nflag) { 1325 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1326 NI_NAMEREQD) == 0) { 1327 if ((cp = strchr(line, '.')) && 1328 !strcmp(cp + 1, domain)) 1329 *cp = 0; 1330 cp = line; 1331 } 1332 } 1333 if (cp) 1334 return cp; 1335 1336 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1337 NI_NUMERICHOST) != 0) 1338 strlcpy(line, "invalid", sizeof(line)); 1339 return line; 1340 } 1341 1342 void 1343 usage(void) 1344 { 1345 1346 fprintf(stderr, 1347 "usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1348 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1349 exit(1); 1350 } 1351