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. Neither the name of the University nor the names of its contributors 48 * may be used to endorse or promote products derived from this software 49 * without specific prior written permission. 50 * 51 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 52 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 53 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 54 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 55 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 56 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 57 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 58 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 59 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 60 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 61 * SUCH DAMAGE. 62 * 63 * "@(#) Copyright (c) 1990, 1993 64 * The Regents of the University of California. All rights reserved. 65 * 66 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.22 2008/02/10 21:06:38 dwmalone Exp $ 67 */ 68 69 /* 70 * traceroute host - trace the route ip packets follow going to "host". 71 * 72 * Attempt to trace the route an ip packet would follow to some 73 * internet host. We find out intermediate hops by launching probe 74 * packets with a small ttl (time to live) then listening for an 75 * icmp "time exceeded" reply from a gateway. We start our probes 76 * with a ttl of one and increase by one until we get an icmp "port 77 * unreachable" (which means we got to "host") or hit a max (which 78 * defaults to 30 hops & can be changed with the -m flag). Three 79 * probes (change with -q flag) are sent at each ttl setting and a 80 * line is printed showing the ttl, address of the gateway and 81 * round trip time of each probe. If the probe answers come from 82 * different gateways, the address of each responding system will 83 * be printed. If there is no response within a 5 sec. timeout 84 * interval (changed with the -w flag), a "*" is printed for that 85 * probe. 86 * 87 * Probe packets are UDP format. We don't want the destination 88 * host to process them so the destination port is set to an 89 * unlikely value (if some clod on the destination is using that 90 * value, it can be changed with the -p flag). 91 * 92 * A sample use might be: 93 * 94 * [yak 71]% traceroute nis.nsf.net. 95 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 96 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 97 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 98 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 99 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 100 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 101 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 102 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 103 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 104 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 105 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 106 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 107 * 108 * Note that lines 2 & 3 are the same. This is due to a buggy 109 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 110 * packets with a zero ttl. 111 * 112 * A more interesting example is: 113 * 114 * [yak 72]% traceroute allspice.lcs.mit.edu. 115 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 116 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 117 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 118 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 119 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 120 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 121 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 122 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 123 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 124 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 125 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 126 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 127 * 12 * * * 128 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 129 * 14 * * * 130 * 15 * * * 131 * 16 * * * 132 * 17 * * * 133 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 134 * 135 * (I start to see why I'm having so much trouble with mail to 136 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 137 * either don't send ICMP "time exceeded" messages or send them 138 * with a ttl too small to reach us. 14 - 17 are running the 139 * MIT C Gateway code that doesn't send "time exceeded"s. God 140 * only knows what's going on with 12. 141 * 142 * The silent gateway 12 in the above may be the result of a bug in 143 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 144 * sends an unreachable message using whatever ttl remains in the 145 * original datagram. Since, for gateways, the remaining ttl is 146 * zero, the icmp "time exceeded" is guaranteed to not make it back 147 * to us. The behavior of this bug is slightly more interesting 148 * when it appears on the destination system: 149 * 150 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 151 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 152 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 153 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 154 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 155 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 156 * 7 * * * 157 * 8 * * * 158 * 9 * * * 159 * 10 * * * 160 * 11 * * * 161 * 12 * * * 162 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 163 * 164 * Notice that there are 12 "gateways" (13 is the final 165 * destination) and exactly the last half of them are "missing". 166 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 167 * is using the ttl from our arriving datagram as the ttl in its 168 * icmp reply. So, the reply will time out on the return path 169 * (with no notice sent to anyone since icmp's aren't sent for 170 * icmp's) until we probe with a ttl that's at least twice the path 171 * length. I.e., rip is really only 7 hops away. A reply that 172 * returns with a ttl of 1 is a clue this problem exists. 173 * Traceroute prints a "!" after the time if the ttl is <= 1. 174 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 175 * non-standard (HPUX) software, expect to see this problem 176 * frequently and/or take care picking the target host of your 177 * probes. 178 * 179 * Other possible annotations after the time are !H, !N, !P (got a host, 180 * network or protocol unreachable, respectively), !S or !F (source 181 * route failed or fragmentation needed -- neither of these should 182 * ever occur and the associated gateway is busted if you see one). If 183 * almost all the probes result in some kind of unreachable, traceroute 184 * will give up and exit. 185 * 186 * Notes 187 * ----- 188 * This program must be run by root or be setuid. (I suggest that 189 * you *don't* make it setuid -- casual use could result in a lot 190 * of unnecessary traffic on our poor, congested nets.) 191 * 192 * This program requires a kernel mod that does not appear in any 193 * system available from Berkeley: A raw ip socket using proto 194 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 195 * opposed to data to be wrapped in an ip datagram). See the README 196 * file that came with the source to this program for a description 197 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 198 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 199 * MODIFIED TO RUN THIS PROGRAM. 200 * 201 * The udp port usage may appear bizarre (well, ok, it is bizarre). 202 * The problem is that an icmp message only contains 8 bytes of 203 * data from the original datagram. 8 bytes is the size of a udp 204 * header so, if we want to associate replies with the original 205 * datagram, the necessary information must be encoded into the 206 * udp header (the ip id could be used but there's no way to 207 * interlock with the kernel's assignment of ip id's and, anyway, 208 * it would have taken a lot more kernel hacking to allow this 209 * code to set the ip id). So, to allow two or more users to 210 * use traceroute simultaneously, we use this task's pid as the 211 * source port (the high bit is set to move the port number out 212 * of the "likely" range). To keep track of which probe is being 213 * replied to (so times and/or hop counts don't get confused by a 214 * reply that was delayed in transit), we increment the destination 215 * port number before each probe. 216 * 217 * Don't use this as a coding example. I was trying to find a 218 * routing problem and this code sort-of popped out after 48 hours 219 * without sleep. I was amazed it ever compiled, much less ran. 220 * 221 * I stole the idea for this program from Steve Deering. Since 222 * the first release, I've learned that had I attended the right 223 * IETF working group meetings, I also could have stolen it from Guy 224 * Almes or Matt Mathis. I don't know (or care) who came up with 225 * the idea first. I envy the originators' perspicacity and I'm 226 * glad they didn't keep the idea a secret. 227 * 228 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 229 * enhancements to the original distribution. 230 * 231 * I've hacked up a round-trip-route version of this that works by 232 * sending a loose-source-routed udp datagram through the destination 233 * back to yourself. Unfortunately, SO many gateways botch source 234 * routing, the thing is almost worthless. Maybe one day... 235 * 236 * -- Van Jacobson (van@helios.ee.lbl.gov) 237 * Tue Dec 20 03:50:13 PST 1988 238 */ 239 240 #include <sys/param.h> 241 #include <sys/time.h> 242 #include <sys/socket.h> 243 #include <sys/uio.h> 244 #include <sys/file.h> 245 #include <sys/ioctl.h> 246 #include <sys/sysctl.h> 247 248 #include <netinet/in.h> 249 250 #include <arpa/inet.h> 251 252 #include <netdb.h> 253 #include <stdio.h> 254 #include <err.h> 255 #ifdef HAVE_POLL 256 #include <poll.h> 257 #endif 258 #include <errno.h> 259 #include <stdlib.h> 260 #include <string.h> 261 #include <unistd.h> 262 263 #include <netinet/ip6.h> 264 #include <netinet/icmp6.h> 265 #include <netinet/udp.h> 266 267 #define DUMMY_PORT 10010 268 269 #define MAXPACKET 65535 /* max ip packet size */ 270 271 #ifndef HAVE_GETIPNODEBYNAME 272 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 273 #define freehostent(x) 274 #endif 275 276 /* 277 * format of a (udp) probe packet. 278 */ 279 struct tv32 { 280 u_int32_t tv32_sec; 281 u_int32_t tv32_usec; 282 }; 283 284 struct opacket { 285 u_char seq; /* sequence number of this packet */ 286 u_char hops; /* hop limit of the packet */ 287 u_char pad[2]; 288 struct tv32 tv; /* time packet left */ 289 } __attribute__((__packed__)); 290 291 static u_char packet[512]; /* last inbound (icmp) packet */ 292 static struct opacket *outpacket; /* last output (udp) packet */ 293 294 static int wait_for_reply(int, struct msghdr *); 295 static void send_probe(int, u_long); 296 static void *get_uphdr(struct ip6_hdr *, u_char *); 297 static double deltaT(struct timeval *, struct timeval *); 298 static char *pr_type(int); 299 static int packet_ok(struct msghdr *, int, int); 300 static void print(struct msghdr *, int); 301 static const char *inetname(struct sockaddr *); 302 static void usage(void) __dead2; 303 304 static int rcvsock; /* receive (icmp) socket file descriptor */ 305 static int sndsock; /* send (udp) socket file descriptor */ 306 307 static struct msghdr rcvmhdr; 308 static struct iovec rcviov[2]; 309 static int rcvhlim; 310 static struct in6_pktinfo *rcvpktinfo; 311 312 static struct sockaddr_in6 Src, Dst, Rcv; 313 static u_long datalen; /* How much data */ 314 #define ICMP6ECHOLEN 8 315 316 static char *source = NULL; 317 static char *hostname; 318 319 static u_long nprobes = 3; 320 static u_long first_hop = 1; 321 static u_long max_hops = 30; 322 static u_int16_t srcport; 323 static u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 324 static u_int16_t ident; 325 static int options; /* socket options */ 326 static int verbose; 327 static int waittime = 5; /* time to wait for response (in seconds) */ 328 static int nflag; /* print addresses numerically */ 329 static int useproto = IPPROTO_UDP; /* protocol to use to send packet */ 330 static int lflag; /* print both numerical address & hostname */ 331 332 int 333 main(int argc, char **argv) 334 { 335 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 336 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 337 int ch, i, on = 1, seq, rcvcmsglen, error, minlen; 338 struct addrinfo hints, *res; 339 static u_char *rcvcmsgbuf; 340 u_long probe, hops, lport; 341 struct hostent *hp; 342 size_t size; 343 uid_t uid; 344 345 /* 346 * Receive ICMP 347 */ 348 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 349 perror("socket(ICMPv6)"); 350 exit(5); 351 } 352 353 size = sizeof(i); 354 (void) sysctl(mib, NELEM(mib), &i, &size, NULL, 0); 355 max_hops = i; 356 357 /* specify to tell receiving interface */ 358 #ifdef IPV6_RECVPKTINFO 359 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 360 sizeof(on)) < 0) 361 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 362 #else /* old adv. API */ 363 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 364 sizeof(on)) < 0) 365 err(1, "setsockopt(IPV6_PKTINFO)"); 366 #endif 367 368 /* specify to tell value of hoplimit field of received IP6 hdr */ 369 #ifdef IPV6_RECVHOPLIMIT 370 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 371 sizeof(on)) < 0) 372 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 373 #else /* old adv. API */ 374 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 375 sizeof(on)) < 0) 376 err(1, "setsockopt(IPV6_HOPLIMIT)"); 377 #endif 378 379 seq = 0; 380 381 while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1) 382 switch (ch) { 383 case 'd': 384 options |= SO_DEBUG; 385 break; 386 case 'f': 387 ep = NULL; 388 errno = 0; 389 first_hop = strtoul(optarg, &ep, 0); 390 if (errno || !*optarg || *ep || first_hop > 255) { 391 fprintf(stderr, 392 "traceroute6: invalid min hoplimit.\n"); 393 exit(1); 394 } 395 break; 396 case 'g': 397 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 398 if (hp == NULL) { 399 fprintf(stderr, 400 "traceroute6: unknown host %s\n", optarg); 401 exit(1); 402 } 403 freehostent(hp); 404 break; 405 case 'I': 406 useproto = IPPROTO_ICMPV6; 407 ident = htons(getpid() & 0xffff); /* same as ping6 */ 408 break; 409 case 'l': 410 lflag++; 411 break; 412 case 'm': 413 ep = NULL; 414 errno = 0; 415 max_hops = strtoul(optarg, &ep, 0); 416 if (errno || !*optarg || *ep || max_hops > 255) { 417 fprintf(stderr, 418 "traceroute6: invalid max hoplimit.\n"); 419 exit(1); 420 } 421 break; 422 case 'n': 423 nflag++; 424 break; 425 case 'N': 426 useproto = IPPROTO_NONE; 427 break; 428 case 'p': 429 ep = NULL; 430 errno = 0; 431 lport = strtoul(optarg, &ep, 0); 432 if (errno || !*optarg || *ep) { 433 fprintf(stderr, "traceroute6: invalid port.\n"); 434 exit(1); 435 } 436 if (lport == 0 || lport != (lport & 0xffff)) { 437 fprintf(stderr, 438 "traceroute6: port out of range.\n"); 439 exit(1); 440 } 441 port = lport & 0xffff; 442 break; 443 case 'q': 444 ep = NULL; 445 errno = 0; 446 nprobes = strtoul(optarg, &ep, 0); 447 if (errno || !*optarg || *ep) { 448 fprintf(stderr, 449 "traceroute6: invalid nprobes.\n"); 450 exit(1); 451 } 452 if (nprobes < 1) { 453 fprintf(stderr, 454 "traceroute6: nprobes must be >0.\n"); 455 exit(1); 456 } 457 break; 458 case 'r': 459 options |= SO_DONTROUTE; 460 break; 461 case 's': 462 /* 463 * set the ip source address of the outbound 464 * probe (e.g., on a multi-homed host). 465 */ 466 source = optarg; 467 break; 468 case 'v': 469 verbose++; 470 break; 471 case 'U': 472 useproto = IPPROTO_UDP; 473 break; 474 case 'w': 475 ep = NULL; 476 errno = 0; 477 waittime = strtoul(optarg, &ep, 0); 478 if (errno || !*optarg || *ep) { 479 fprintf(stderr, 480 "traceroute6: invalid wait time.\n"); 481 exit(1); 482 } 483 if (waittime < 1) { 484 fprintf(stderr, 485 "traceroute6: wait must be >= 1 sec.\n"); 486 exit(1); 487 } 488 break; 489 default: 490 usage(); 491 } 492 argc -= optind; 493 argv += optind; 494 495 /* 496 * Open socket to send probe packets. 497 */ 498 switch (useproto) { 499 case IPPROTO_ICMPV6: 500 sndsock = rcvsock; 501 break; 502 case IPPROTO_UDP: 503 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 504 perror("socket(SOCK_DGRAM)"); 505 exit(5); 506 } 507 break; 508 case IPPROTO_NONE: 509 if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) { 510 perror("socket(SOCK_RAW)"); 511 exit(5); 512 } 513 break; 514 default: 515 fprintf(stderr, "traceroute6: unknown probe protocol %d", 516 useproto); 517 exit(5); 518 } 519 if (max_hops < first_hop) { 520 fprintf(stderr, 521 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 522 exit(1); 523 } 524 525 /* revoke privs */ 526 uid = getuid(); 527 if (setresuid(uid, uid, uid) == -1) { 528 perror("setresuid"); 529 exit(1); 530 } 531 532 533 if (argc < 1 || argc > 2) 534 usage(); 535 536 #if 1 537 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 538 #else 539 setlinebuf(stdout); 540 #endif 541 542 memset(&hints, 0, sizeof(hints)); 543 hints.ai_family = PF_INET6; 544 hints.ai_socktype = SOCK_RAW; 545 hints.ai_protocol = IPPROTO_ICMPV6; 546 hints.ai_flags = AI_CANONNAME; 547 error = getaddrinfo(*argv, NULL, &hints, &res); 548 if (error) { 549 fprintf(stderr, 550 "traceroute6: %s\n", gai_strerror(error)); 551 exit(1); 552 } 553 if (res->ai_addrlen != sizeof(Dst)) { 554 fprintf(stderr, 555 "traceroute6: size of sockaddr mismatch\n"); 556 exit(1); 557 } 558 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 559 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 560 if (!hostname) { 561 fprintf(stderr, "traceroute6: not enough core\n"); 562 exit(1); 563 } 564 if (res->ai_next) { 565 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 566 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 567 strlcpy(hbuf, "?", sizeof(hbuf)); 568 fprintf(stderr, "traceroute6: Warning: %s has multiple " 569 "addresses; using %s\n", hostname, hbuf); 570 } 571 572 if (*++argv) { 573 ep = NULL; 574 errno = 0; 575 datalen = strtoul(*argv, &ep, 0); 576 if (errno || !*argv || *ep) { 577 fprintf(stderr, 578 "traceroute6: invalid packet length.\n"); 579 exit(1); 580 } 581 } 582 switch (useproto) { 583 case IPPROTO_ICMPV6: 584 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 585 break; 586 case IPPROTO_UDP: 587 minlen = sizeof(struct opacket); 588 break; 589 case IPPROTO_NONE: 590 minlen = 0; 591 datalen = 0; 592 break; 593 default: 594 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n", 595 useproto); 596 exit(1); 597 } 598 if (datalen < minlen) 599 datalen = minlen; 600 else if (datalen >= MAXPACKET) { 601 fprintf(stderr, 602 "traceroute6: packet size must be %d <= s < %ld.\n", 603 minlen, (long)MAXPACKET); 604 exit(1); 605 } 606 outpacket = (struct opacket *)malloc((unsigned)datalen); 607 if (!outpacket) { 608 perror("malloc"); 609 exit(1); 610 } 611 (void) bzero((char *)outpacket, datalen); 612 613 /* initialize msghdr for receiving packets */ 614 rcviov[0].iov_base = (caddr_t)packet; 615 rcviov[0].iov_len = sizeof(packet); 616 rcvmhdr.msg_name = (caddr_t)&Rcv; 617 rcvmhdr.msg_namelen = sizeof(Rcv); 618 rcvmhdr.msg_iov = rcviov; 619 rcvmhdr.msg_iovlen = 1; 620 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 621 CMSG_SPACE(sizeof(int)); 622 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 623 fprintf(stderr, "traceroute6: malloc failed\n"); 624 exit(1); 625 } 626 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 627 rcvmhdr.msg_controllen = rcvcmsglen; 628 629 if (options & SO_DEBUG) 630 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 631 (char *)&on, sizeof(on)); 632 if (options & SO_DONTROUTE) 633 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 634 (char *)&on, sizeof(on)); 635 #ifdef SO_SNDBUF 636 i = datalen; 637 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 638 sizeof(i)) < 0 && useproto != IPPROTO_NONE) { 639 perror("setsockopt(SO_SNDBUF)"); 640 exit(6); 641 } 642 #endif /* SO_SNDBUF */ 643 if (options & SO_DEBUG) 644 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 645 (char *)&on, sizeof(on)); 646 if (options & SO_DONTROUTE) 647 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 648 (char *)&on, sizeof(on)); 649 /* 650 * Source selection 651 */ 652 bzero(&Src, sizeof(Src)); 653 if (source) { 654 struct addrinfo hints, *res; 655 int error; 656 657 memset(&hints, 0, sizeof(hints)); 658 hints.ai_family = AF_INET6; 659 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 660 hints.ai_flags = AI_NUMERICHOST; 661 error = getaddrinfo(source, "0", &hints, &res); 662 if (error) { 663 printf("traceroute6: %s: %s\n", source, 664 gai_strerror(error)); 665 exit(1); 666 } 667 if (res->ai_addrlen > sizeof(Src)) { 668 printf("traceroute6: %s: %s\n", source, 669 gai_strerror(error)); 670 exit(1); 671 } 672 memcpy(&Src, res->ai_addr, res->ai_addrlen); 673 freeaddrinfo(res); 674 } else { 675 struct sockaddr_in6 Nxt; 676 int dummy; 677 socklen_t len; 678 679 Nxt = Dst; 680 Nxt.sin6_port = htons(DUMMY_PORT); 681 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 682 perror("socket"); 683 exit(1); 684 } 685 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 686 perror("connect"); 687 exit(1); 688 } 689 len = sizeof(Src); 690 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 691 perror("getsockname"); 692 exit(1); 693 } 694 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 695 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 696 fprintf(stderr, "getnameinfo failed for source\n"); 697 exit(1); 698 } 699 source = src0; 700 close(dummy); 701 } 702 703 Src.sin6_port = htons(0); 704 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 705 perror("bind"); 706 exit(1); 707 } 708 709 { 710 socklen_t len; 711 712 len = sizeof(Src); 713 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 714 perror("getsockname"); 715 exit(1); 716 } 717 srcport = ntohs(Src.sin6_port); 718 } 719 720 /* 721 * Message to users 722 */ 723 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 724 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 725 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 726 fprintf(stderr, "traceroute6"); 727 fprintf(stderr, " to %s (%s)", hostname, hbuf); 728 if (source) 729 fprintf(stderr, " from %s", source); 730 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 731 max_hops, datalen); 732 (void) fflush(stderr); 733 734 if (first_hop > 1) 735 printf("Skipping %lu intermediate hops\n", first_hop - 1); 736 737 /* 738 * Main loop 739 */ 740 for (hops = first_hop; hops <= max_hops; ++hops) { 741 struct in6_addr lastaddr; 742 int got_there = 0; 743 int unreachable = 0; 744 745 printf("%2lu ", hops); 746 bzero(&lastaddr, sizeof(lastaddr)); 747 for (probe = 0; probe < nprobes; ++probe) { 748 int cc; 749 struct timeval t1, t2; 750 751 (void) gettimeofday(&t1, NULL); 752 send_probe(++seq, hops); 753 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 754 (void) gettimeofday(&t2, NULL); 755 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 756 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 757 &lastaddr)) { 758 if (probe > 0) 759 fputs("\n ", stdout); 760 print(&rcvmhdr, cc); 761 lastaddr = Rcv.sin6_addr; 762 } 763 printf(" %.3f ms", deltaT(&t1, &t2)); 764 switch (i - 1) { 765 case ICMP6_DST_UNREACH_NOROUTE: 766 ++unreachable; 767 printf(" !N"); 768 break; 769 case ICMP6_DST_UNREACH_ADMIN: 770 ++unreachable; 771 printf(" !P"); 772 break; 773 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 774 ++unreachable; 775 printf(" !S"); 776 break; 777 case ICMP6_DST_UNREACH_ADDR: 778 ++unreachable; 779 printf(" !A"); 780 break; 781 case ICMP6_DST_UNREACH_NOPORT: 782 if (rcvhlim >= 0 && 783 rcvhlim <= 1) 784 printf(" !"); 785 ++got_there; 786 break; 787 } 788 break; 789 } 790 } 791 if (cc == 0) 792 printf(" *"); 793 (void) fflush(stdout); 794 } 795 putchar('\n'); 796 if (got_there || 797 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 798 exit(0); 799 } 800 } 801 802 exit(0); 803 } 804 805 static int 806 wait_for_reply(int sock, struct msghdr *mhdr) 807 { 808 #ifdef HAVE_POLL 809 struct pollfd pfd[1]; 810 int cc = 0; 811 812 pfd[0].fd = sock; 813 pfd[0].events = POLLIN; 814 pfd[0].revents = 0; 815 816 if (poll(pfd, 1, waittime * 1000) > 0) 817 cc = recvmsg(rcvsock, mhdr, 0); 818 819 return(cc); 820 #else 821 fd_set *fdsp; 822 struct timeval wait; 823 int cc = 0, fdsn; 824 825 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 826 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 827 err(1, "malloc"); 828 memset(fdsp, 0, fdsn); 829 FD_SET(sock, fdsp); 830 wait.tv_sec = waittime; wait.tv_usec = 0; 831 832 if (select(sock+1, fdsp, NULL, NULL, &wait) > 0) 833 cc = recvmsg(rcvsock, mhdr, 0); 834 835 free(fdsp); 836 return(cc); 837 #endif 838 } 839 840 static void 841 send_probe(int seq, u_long hops) 842 { 843 struct icmp6_hdr *icp; 844 struct opacket *op; 845 struct timeval tv; 846 struct tv32 tv32; 847 int i; 848 849 i = hops; 850 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 851 (char *)&i, sizeof(i)) < 0) { 852 perror("setsockopt IPV6_UNICAST_HOPS"); 853 } 854 855 Dst.sin6_port = htons(port + seq); 856 (void) gettimeofday(&tv, NULL); 857 tv32.tv32_sec = htonl(tv.tv_sec); 858 tv32.tv32_usec = htonl(tv.tv_usec); 859 860 switch (useproto) { 861 case IPPROTO_ICMPV6: 862 icp = (struct icmp6_hdr *)outpacket; 863 864 icp->icmp6_type = ICMP6_ECHO_REQUEST; 865 icp->icmp6_code = 0; 866 icp->icmp6_cksum = 0; 867 icp->icmp6_id = ident; 868 icp->icmp6_seq = htons(seq); 869 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 870 sizeof(tv32)); 871 break; 872 case IPPROTO_UDP: 873 op = outpacket; 874 875 op->seq = seq; 876 op->hops = hops; 877 bcopy(&tv32, &op->tv, sizeof tv32); 878 break; 879 case IPPROTO_NONE: 880 /* No space for anything. No harm as seq/tv32 are decorative. */ 881 break; 882 default: 883 fprintf(stderr, "Unknown probe protocol %d.\n", useproto); 884 exit(1); 885 } 886 887 i = sendto(sndsock, (char *)outpacket, datalen, 0, 888 (struct sockaddr *)&Dst, Dst.sin6_len); 889 if (i < 0 || i != datalen) { 890 if (i < 0) 891 perror("sendto"); 892 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 893 hostname, datalen, i); 894 (void) fflush(stdout); 895 } 896 } 897 898 static double 899 deltaT(struct timeval *t1p, struct timeval *t2p) 900 { 901 double dt; 902 903 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 904 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 905 return (dt); 906 } 907 908 /* 909 * Convert an ICMP "type" field to a printable string. 910 */ 911 static char * 912 pr_type(int t0) 913 { 914 u_char t = t0 & 0xff; 915 char *cp; 916 917 switch (t) { 918 case ICMP6_DST_UNREACH: 919 cp = "Destination Unreachable"; 920 break; 921 case ICMP6_PACKET_TOO_BIG: 922 cp = "Packet Too Big"; 923 break; 924 case ICMP6_TIME_EXCEEDED: 925 cp = "Time Exceeded"; 926 break; 927 case ICMP6_PARAM_PROB: 928 cp = "Parameter Problem"; 929 break; 930 case ICMP6_ECHO_REQUEST: 931 cp = "Echo Request"; 932 break; 933 case ICMP6_ECHO_REPLY: 934 cp = "Echo Reply"; 935 break; 936 case ICMP6_MEMBERSHIP_QUERY: 937 cp = "Group Membership Query"; 938 break; 939 case ICMP6_MEMBERSHIP_REPORT: 940 cp = "Group Membership Report"; 941 break; 942 case ICMP6_MEMBERSHIP_REDUCTION: 943 cp = "Group Membership Reduction"; 944 break; 945 case ND_ROUTER_SOLICIT: 946 cp = "Router Solicitation"; 947 break; 948 case ND_ROUTER_ADVERT: 949 cp = "Router Advertisement"; 950 break; 951 case ND_NEIGHBOR_SOLICIT: 952 cp = "Neighbor Solicitation"; 953 break; 954 case ND_NEIGHBOR_ADVERT: 955 cp = "Neighbor Advertisement"; 956 break; 957 case ND_REDIRECT: 958 cp = "Redirect"; 959 break; 960 default: 961 cp = "Unknown"; 962 break; 963 } 964 return cp; 965 } 966 967 static int 968 packet_ok(struct msghdr *mhdr, int cc, int seq) 969 { 970 struct icmp6_hdr *icp; 971 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 972 u_char type, code; 973 char *buf = (char *)mhdr->msg_iov[0].iov_base; 974 struct cmsghdr *cm; 975 int *hlimp; 976 char hbuf[NI_MAXHOST]; 977 978 #ifdef OLDRAWSOCKET 979 int hlen; 980 struct ip6_hdr *ip; 981 #endif 982 983 #ifdef OLDRAWSOCKET 984 ip = (struct ip6_hdr *) buf; 985 hlen = sizeof(struct ip6_hdr); 986 if (cc < hlen + sizeof(struct icmp6_hdr)) { 987 if (verbose) { 988 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 989 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 990 strlcpy(hbuf, "invalid", sizeof(hbuf)); 991 printf("packet too short (%d bytes) from %s\n", cc, 992 hbuf); 993 } 994 return (0); 995 } 996 cc -= hlen; 997 icp = (struct icmp6_hdr *)(buf + hlen); 998 #else 999 if (cc < sizeof(struct icmp6_hdr)) { 1000 if (verbose) { 1001 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1002 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1003 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1004 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1005 } 1006 return(0); 1007 } 1008 icp = (struct icmp6_hdr *)buf; 1009 #endif 1010 /* get optional information via advanced API */ 1011 rcvpktinfo = NULL; 1012 hlimp = NULL; 1013 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1014 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1015 if (cm->cmsg_level == IPPROTO_IPV6 && 1016 cm->cmsg_type == IPV6_PKTINFO && 1017 cm->cmsg_len == 1018 CMSG_LEN(sizeof(struct in6_pktinfo))) 1019 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1020 1021 if (cm->cmsg_level == IPPROTO_IPV6 && 1022 cm->cmsg_type == IPV6_HOPLIMIT && 1023 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1024 hlimp = (int *)CMSG_DATA(cm); 1025 } 1026 if (rcvpktinfo == NULL || hlimp == NULL) { 1027 warnx("failed to get received hop limit or packet info"); 1028 #if 0 1029 return(0); 1030 #else 1031 rcvhlim = 0; /*XXX*/ 1032 #endif 1033 } 1034 else 1035 rcvhlim = *hlimp; 1036 1037 type = icp->icmp6_type; 1038 code = icp->icmp6_code; 1039 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1040 || type == ICMP6_DST_UNREACH) { 1041 struct ip6_hdr *hip; 1042 void *up; 1043 1044 hip = (struct ip6_hdr *)(icp + 1); 1045 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) { 1046 if (verbose) 1047 warnx("failed to get upper layer header"); 1048 return(0); 1049 } 1050 switch (useproto) { 1051 case IPPROTO_ICMPV6: 1052 if (((struct icmp6_hdr *)up)->icmp6_id == ident && 1053 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1054 return (type == ICMP6_TIME_EXCEEDED ? 1055 -1 : code + 1); 1056 break; 1057 case IPPROTO_UDP: 1058 if (((struct udphdr *)up)->uh_sport == htons(srcport) && 1059 ((struct udphdr *)up)->uh_dport == htons(port + seq)) 1060 return (type == ICMP6_TIME_EXCEEDED ? 1061 -1 : code + 1); 1062 break; 1063 case IPPROTO_NONE: 1064 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1065 default: 1066 fprintf(stderr, "Unknown probe proto %d.\n", useproto); 1067 break; 1068 } 1069 } else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) { 1070 if (icp->icmp6_id == ident && 1071 icp->icmp6_seq == htons(seq)) 1072 return (ICMP6_DST_UNREACH_NOPORT + 1); 1073 } 1074 if (verbose) { 1075 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1076 u_int8_t *p; 1077 int i; 1078 1079 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1080 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1081 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1082 printf("\n%d bytes from %s to %s", cc, sbuf, 1083 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1084 dbuf, sizeof(dbuf)) : "?"); 1085 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1086 icp->icmp6_code); 1087 p = (u_int8_t *)(icp + 1); 1088 #define WIDTH 16 1089 for (i = 0; i < cc; i++) { 1090 if (i % WIDTH == 0) 1091 printf("%04x:", i); 1092 if (i % 4 == 0) 1093 printf(" "); 1094 printf("%02x", p[i]); 1095 if (i % WIDTH == WIDTH - 1) 1096 printf("\n"); 1097 } 1098 if (cc % WIDTH != 0) 1099 printf("\n"); 1100 } 1101 return(0); 1102 } 1103 1104 /* 1105 * Increment pointer until find the UDP or ICMP header. 1106 */ 1107 static void * 1108 get_uphdr(struct ip6_hdr *ip6, u_char *lim) 1109 { 1110 u_char *cp = (u_char *)ip6, nh; 1111 int hlen; 1112 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */ 1113 1114 if (cp + sizeof(*ip6) > lim) 1115 return(NULL); 1116 1117 nh = ip6->ip6_nxt; 1118 cp += sizeof(struct ip6_hdr); 1119 1120 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) { 1121 switch (nh) { 1122 case IPPROTO_ESP: 1123 case IPPROTO_TCP: 1124 return(NULL); 1125 case IPPROTO_ICMPV6: 1126 return(useproto == nh ? cp : NULL); 1127 case IPPROTO_UDP: 1128 return(useproto == nh ? cp : NULL); 1129 case IPPROTO_NONE: 1130 return(useproto == nh ? none_hdr : NULL); 1131 case IPPROTO_FRAGMENT: 1132 hlen = sizeof(struct ip6_frag); 1133 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1134 break; 1135 case IPPROTO_AH: 1136 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1137 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1138 break; 1139 default: 1140 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1141 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1142 break; 1143 } 1144 1145 cp += hlen; 1146 } 1147 1148 return(NULL); 1149 } 1150 1151 static void 1152 print(struct msghdr *mhdr, int cc) 1153 { 1154 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1155 char hbuf[NI_MAXHOST]; 1156 1157 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1158 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1159 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1160 if (nflag) 1161 printf(" %s", hbuf); 1162 else if (lflag) 1163 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1164 else 1165 printf(" %s", inetname((struct sockaddr *)from)); 1166 1167 if (verbose) { 1168 #ifdef OLDRAWSOCKET 1169 printf(" %d bytes to %s", cc, 1170 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1171 hbuf, sizeof(hbuf)) : "?"); 1172 #else 1173 printf(" %d bytes of data to %s", cc, 1174 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1175 hbuf, sizeof(hbuf)) : "?"); 1176 #endif 1177 } 1178 } 1179 1180 /* 1181 * Construct an Internet address representation. 1182 * If the nflag has been supplied, give 1183 * numeric value, otherwise try for symbolic name. 1184 */ 1185 static const char * 1186 inetname(struct sockaddr *sa) 1187 { 1188 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1189 static int first = 1; 1190 char *cp; 1191 1192 if (first && !nflag) { 1193 first = 0; 1194 if (gethostname(domain, sizeof(domain)) == 0 && 1195 (cp = strchr(domain, '.'))) 1196 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1197 else 1198 domain[0] = 0; 1199 } 1200 cp = NULL; 1201 if (!nflag) { 1202 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1203 NI_NAMEREQD) == 0) { 1204 if ((cp = strchr(line, '.')) && 1205 !strcmp(cp + 1, domain)) 1206 *cp = 0; 1207 cp = line; 1208 } 1209 } 1210 if (cp) 1211 return cp; 1212 1213 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1214 NI_NUMERICHOST) != 0) 1215 strlcpy(line, "invalid", sizeof(line)); 1216 return line; 1217 } 1218 1219 static void 1220 usage(void) 1221 { 1222 1223 fprintf(stderr, 1224 "usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1225 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1226 exit(1); 1227 } 1228