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 * 4. 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 #ifdef IPSEC 268 #include <net/route.h> 269 #include <netinet6/ipsec.h> 270 #endif 271 272 #define DUMMY_PORT 10010 273 274 #define MAXPACKET 65535 /* max ip packet size */ 275 276 #ifndef HAVE_GETIPNODEBYNAME 277 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 278 #define freehostent(x) 279 #endif 280 281 /* 282 * format of a (udp) probe packet. 283 */ 284 struct tv32 { 285 u_int32_t tv32_sec; 286 u_int32_t tv32_usec; 287 }; 288 289 struct opacket { 290 u_char seq; /* sequence number of this packet */ 291 u_char hops; /* hop limit of the packet */ 292 u_char pad[2]; 293 struct tv32 tv; /* time packet left */ 294 } __attribute__((__packed__)); 295 296 u_char packet[512]; /* last inbound (icmp) packet */ 297 struct opacket *outpacket; /* last output (udp) packet */ 298 299 int main(int, char *[]); 300 int wait_for_reply(int, struct msghdr *); 301 #ifdef IPSEC 302 #ifdef IPSEC_POLICY_IPSEC 303 int setpolicy(int so, char *policy); 304 #endif 305 #endif 306 void send_probe(int, u_long); 307 void *get_uphdr(struct ip6_hdr *, u_char *); 308 int get_hoplim(struct msghdr *); 309 double deltaT(struct timeval *, struct timeval *); 310 char *pr_type(int); 311 int packet_ok(struct msghdr *, int, int); 312 void print(struct msghdr *, int); 313 const char *inetname(struct sockaddr *); 314 void usage(void); 315 316 int rcvsock; /* receive (icmp) socket file descriptor */ 317 int sndsock; /* send (udp) socket file descriptor */ 318 319 struct msghdr rcvmhdr; 320 struct iovec rcviov[2]; 321 int rcvhlim; 322 struct in6_pktinfo *rcvpktinfo; 323 324 struct sockaddr_in6 Src, Dst, Rcv; 325 u_long datalen; /* How much data */ 326 #define ICMP6ECHOLEN 8 327 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 328 char rtbuf[2064]; 329 330 char *source = NULL; 331 char *hostname; 332 333 u_long nprobes = 3; 334 u_long first_hop = 1; 335 u_long max_hops = 30; 336 u_int16_t srcport; 337 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 338 u_int16_t ident; 339 int options; /* socket options */ 340 int verbose; 341 int waittime = 5; /* time to wait for response (in seconds) */ 342 int nflag; /* print addresses numerically */ 343 int useproto = IPPROTO_UDP; /* protocol to use to send packet */ 344 int lflag; /* print both numerical address & hostname */ 345 346 int 347 main(int argc, char **argv) 348 { 349 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 350 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 351 int ch, i, on = 1, seq, rcvcmsglen, error, minlen; 352 struct addrinfo hints, *res; 353 static u_char *rcvcmsgbuf; 354 u_long probe, hops, lport; 355 struct hostent *hp; 356 size_t size; 357 uid_t uid; 358 359 /* 360 * Receive ICMP 361 */ 362 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 363 perror("socket(ICMPv6)"); 364 exit(5); 365 } 366 367 size = sizeof(i); 368 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 369 max_hops = i; 370 371 /* specify to tell receiving interface */ 372 #ifdef IPV6_RECVPKTINFO 373 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 374 sizeof(on)) < 0) 375 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 376 #else /* old adv. API */ 377 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 378 sizeof(on)) < 0) 379 err(1, "setsockopt(IPV6_PKTINFO)"); 380 #endif 381 382 /* specify to tell value of hoplimit field of received IP6 hdr */ 383 #ifdef IPV6_RECVHOPLIMIT 384 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 385 sizeof(on)) < 0) 386 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 387 #else /* old adv. API */ 388 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 389 sizeof(on)) < 0) 390 err(1, "setsockopt(IPV6_HOPLIMIT)"); 391 #endif 392 393 seq = 0; 394 395 while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1) 396 switch (ch) { 397 case 'd': 398 options |= SO_DEBUG; 399 break; 400 case 'f': 401 ep = NULL; 402 errno = 0; 403 first_hop = strtoul(optarg, &ep, 0); 404 if (errno || !*optarg || *ep || first_hop > 255) { 405 fprintf(stderr, 406 "traceroute6: invalid min hoplimit.\n"); 407 exit(1); 408 } 409 break; 410 case 'g': 411 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 412 if (hp == NULL) { 413 fprintf(stderr, 414 "traceroute6: unknown host %s\n", optarg); 415 exit(1); 416 } 417 freehostent(hp); 418 break; 419 case 'I': 420 useproto = IPPROTO_ICMPV6; 421 ident = htons(getpid() & 0xffff); /* same as ping6 */ 422 break; 423 case 'l': 424 lflag++; 425 break; 426 case 'm': 427 ep = NULL; 428 errno = 0; 429 max_hops = strtoul(optarg, &ep, 0); 430 if (errno || !*optarg || *ep || max_hops > 255) { 431 fprintf(stderr, 432 "traceroute6: invalid max hoplimit.\n"); 433 exit(1); 434 } 435 break; 436 case 'n': 437 nflag++; 438 break; 439 case 'N': 440 useproto = IPPROTO_NONE; 441 break; 442 case 'p': 443 ep = NULL; 444 errno = 0; 445 lport = strtoul(optarg, &ep, 0); 446 if (errno || !*optarg || *ep) { 447 fprintf(stderr, "traceroute6: invalid port.\n"); 448 exit(1); 449 } 450 if (lport == 0 || lport != (lport & 0xffff)) { 451 fprintf(stderr, 452 "traceroute6: port out of range.\n"); 453 exit(1); 454 } 455 port = lport & 0xffff; 456 break; 457 case 'q': 458 ep = NULL; 459 errno = 0; 460 nprobes = strtoul(optarg, &ep, 0); 461 if (errno || !*optarg || *ep) { 462 fprintf(stderr, 463 "traceroute6: invalid nprobes.\n"); 464 exit(1); 465 } 466 if (nprobes < 1) { 467 fprintf(stderr, 468 "traceroute6: nprobes must be >0.\n"); 469 exit(1); 470 } 471 break; 472 case 'r': 473 options |= SO_DONTROUTE; 474 break; 475 case 's': 476 /* 477 * set the ip source address of the outbound 478 * probe (e.g., on a multi-homed host). 479 */ 480 source = optarg; 481 break; 482 case 'v': 483 verbose++; 484 break; 485 case 'U': 486 useproto = IPPROTO_UDP; 487 break; 488 case 'w': 489 ep = NULL; 490 errno = 0; 491 waittime = strtoul(optarg, &ep, 0); 492 if (errno || !*optarg || *ep) { 493 fprintf(stderr, 494 "traceroute6: invalid wait time.\n"); 495 exit(1); 496 } 497 if (waittime < 1) { 498 fprintf(stderr, 499 "traceroute6: wait must be >= 1 sec.\n"); 500 exit(1); 501 } 502 break; 503 default: 504 usage(); 505 } 506 argc -= optind; 507 argv += optind; 508 509 /* 510 * Open socket to send probe packets. 511 */ 512 switch (useproto) { 513 case IPPROTO_ICMPV6: 514 sndsock = rcvsock; 515 break; 516 case IPPROTO_UDP: 517 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 518 perror("socket(SOCK_DGRAM)"); 519 exit(5); 520 } 521 break; 522 case IPPROTO_NONE: 523 if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) { 524 perror("socket(SOCK_RAW)"); 525 exit(5); 526 } 527 break; 528 default: 529 fprintf(stderr, "traceroute6: unknown probe protocol %d", 530 useproto); 531 exit(5); 532 } 533 if (max_hops < first_hop) { 534 fprintf(stderr, 535 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 536 exit(1); 537 } 538 539 /* revoke privs */ 540 uid = getuid(); 541 if (setresuid(uid, uid, uid) == -1) { 542 perror("setresuid"); 543 exit(1); 544 } 545 546 547 if (argc < 1 || argc > 2) 548 usage(); 549 550 #if 1 551 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 552 #else 553 setlinebuf(stdout); 554 #endif 555 556 memset(&hints, 0, sizeof(hints)); 557 hints.ai_family = PF_INET6; 558 hints.ai_socktype = SOCK_RAW; 559 hints.ai_protocol = IPPROTO_ICMPV6; 560 hints.ai_flags = AI_CANONNAME; 561 error = getaddrinfo(*argv, NULL, &hints, &res); 562 if (error) { 563 fprintf(stderr, 564 "traceroute6: %s\n", gai_strerror(error)); 565 exit(1); 566 } 567 if (res->ai_addrlen != sizeof(Dst)) { 568 fprintf(stderr, 569 "traceroute6: size of sockaddr mismatch\n"); 570 exit(1); 571 } 572 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 573 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 574 if (!hostname) { 575 fprintf(stderr, "traceroute6: not enough core\n"); 576 exit(1); 577 } 578 if (res->ai_next) { 579 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 580 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 581 strlcpy(hbuf, "?", sizeof(hbuf)); 582 fprintf(stderr, "traceroute6: Warning: %s has multiple " 583 "addresses; using %s\n", hostname, hbuf); 584 } 585 586 if (*++argv) { 587 ep = NULL; 588 errno = 0; 589 datalen = strtoul(*argv, &ep, 0); 590 if (errno || !*argv || *ep) { 591 fprintf(stderr, 592 "traceroute6: invalid packet length.\n"); 593 exit(1); 594 } 595 } 596 switch (useproto) { 597 case IPPROTO_ICMPV6: 598 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 599 break; 600 case IPPROTO_UDP: 601 minlen = sizeof(struct opacket); 602 break; 603 case IPPROTO_NONE: 604 minlen = 0; 605 datalen = 0; 606 break; 607 default: 608 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n", 609 useproto); 610 exit(1); 611 } 612 if (datalen < minlen) 613 datalen = minlen; 614 else if (datalen >= MAXPACKET) { 615 fprintf(stderr, 616 "traceroute6: packet size must be %d <= s < %ld.\n", 617 minlen, (long)MAXPACKET); 618 exit(1); 619 } 620 outpacket = (struct opacket *)malloc((unsigned)datalen); 621 if (!outpacket) { 622 perror("malloc"); 623 exit(1); 624 } 625 (void) bzero((char *)outpacket, datalen); 626 627 /* initialize msghdr for receiving packets */ 628 rcviov[0].iov_base = (caddr_t)packet; 629 rcviov[0].iov_len = sizeof(packet); 630 rcvmhdr.msg_name = (caddr_t)&Rcv; 631 rcvmhdr.msg_namelen = sizeof(Rcv); 632 rcvmhdr.msg_iov = rcviov; 633 rcvmhdr.msg_iovlen = 1; 634 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 635 CMSG_SPACE(sizeof(int)); 636 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 637 fprintf(stderr, "traceroute6: malloc failed\n"); 638 exit(1); 639 } 640 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 641 rcvmhdr.msg_controllen = rcvcmsglen; 642 643 if (options & SO_DEBUG) 644 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 645 (char *)&on, sizeof(on)); 646 if (options & SO_DONTROUTE) 647 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 648 (char *)&on, sizeof(on)); 649 #ifdef IPSEC 650 #ifdef IPSEC_POLICY_IPSEC 651 /* 652 * do not raise error even if setsockopt fails, kernel may have ipsec 653 * turned off. 654 */ 655 if (setpolicy(rcvsock, "in bypass") < 0) 656 errx(1, "%s", ipsec_strerror()); 657 if (setpolicy(rcvsock, "out bypass") < 0) 658 errx(1, "%s", ipsec_strerror()); 659 #else 660 { 661 int level = IPSEC_LEVEL_NONE; 662 663 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 664 sizeof(level)); 665 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 666 sizeof(level)); 667 #ifdef IP_AUTH_TRANS_LEVEL 668 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 669 sizeof(level)); 670 #else 671 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 672 sizeof(level)); 673 #endif 674 #ifdef IP_AUTH_NETWORK_LEVEL 675 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 676 sizeof(level)); 677 #endif 678 } 679 #endif /*IPSEC_POLICY_IPSEC*/ 680 #endif /*IPSEC*/ 681 682 #ifdef SO_SNDBUF 683 i = datalen; 684 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 685 sizeof(i)) < 0 && useproto != IPPROTO_NONE) { 686 perror("setsockopt(SO_SNDBUF)"); 687 exit(6); 688 } 689 #endif /* SO_SNDBUF */ 690 if (options & SO_DEBUG) 691 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 692 (char *)&on, sizeof(on)); 693 if (options & SO_DONTROUTE) 694 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 695 (char *)&on, sizeof(on)); 696 #ifdef IPSEC 697 #ifdef IPSEC_POLICY_IPSEC 698 /* 699 * do not raise error even if setsockopt fails, kernel may have ipsec 700 * turned off. 701 */ 702 if (setpolicy(sndsock, "in bypass") < 0) 703 errx(1, "%s", ipsec_strerror()); 704 if (setpolicy(sndsock, "out bypass") < 0) 705 errx(1, "%s", ipsec_strerror()); 706 #else 707 { 708 int level = IPSEC_LEVEL_BYPASS; 709 710 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 711 sizeof(level)); 712 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 713 sizeof(level)); 714 #ifdef IP_AUTH_TRANS_LEVEL 715 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 716 sizeof(level)); 717 #else 718 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 719 sizeof(level)); 720 #endif 721 #ifdef IP_AUTH_NETWORK_LEVEL 722 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 723 sizeof(level)); 724 #endif 725 } 726 #endif /*IPSEC_POLICY_IPSEC*/ 727 #endif /*IPSEC*/ 728 729 /* 730 * Source selection 731 */ 732 bzero(&Src, sizeof(Src)); 733 if (source) { 734 struct addrinfo hints, *res; 735 int error; 736 737 memset(&hints, 0, sizeof(hints)); 738 hints.ai_family = AF_INET6; 739 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 740 hints.ai_flags = AI_NUMERICHOST; 741 error = getaddrinfo(source, "0", &hints, &res); 742 if (error) { 743 printf("traceroute6: %s: %s\n", source, 744 gai_strerror(error)); 745 exit(1); 746 } 747 if (res->ai_addrlen > sizeof(Src)) { 748 printf("traceroute6: %s: %s\n", source, 749 gai_strerror(error)); 750 exit(1); 751 } 752 memcpy(&Src, res->ai_addr, res->ai_addrlen); 753 freeaddrinfo(res); 754 } else { 755 struct sockaddr_in6 Nxt; 756 int dummy; 757 socklen_t len; 758 759 Nxt = Dst; 760 Nxt.sin6_port = htons(DUMMY_PORT); 761 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 762 perror("socket"); 763 exit(1); 764 } 765 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 766 perror("connect"); 767 exit(1); 768 } 769 len = sizeof(Src); 770 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 771 perror("getsockname"); 772 exit(1); 773 } 774 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 775 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 776 fprintf(stderr, "getnameinfo failed for source\n"); 777 exit(1); 778 } 779 source = src0; 780 close(dummy); 781 } 782 783 Src.sin6_port = htons(0); 784 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 785 perror("bind"); 786 exit(1); 787 } 788 789 { 790 socklen_t len; 791 792 len = sizeof(Src); 793 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 794 perror("getsockname"); 795 exit(1); 796 } 797 srcport = ntohs(Src.sin6_port); 798 } 799 800 /* 801 * Message to users 802 */ 803 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 804 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 805 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 806 fprintf(stderr, "traceroute6"); 807 fprintf(stderr, " to %s (%s)", hostname, hbuf); 808 if (source) 809 fprintf(stderr, " from %s", source); 810 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 811 max_hops, datalen); 812 (void) fflush(stderr); 813 814 if (first_hop > 1) 815 printf("Skipping %lu intermediate hops\n", first_hop - 1); 816 817 /* 818 * Main loop 819 */ 820 for (hops = first_hop; hops <= max_hops; ++hops) { 821 struct in6_addr lastaddr; 822 int got_there = 0; 823 int unreachable = 0; 824 825 printf("%2lu ", hops); 826 bzero(&lastaddr, sizeof(lastaddr)); 827 for (probe = 0; probe < nprobes; ++probe) { 828 int cc; 829 struct timeval t1, t2; 830 831 (void) gettimeofday(&t1, NULL); 832 send_probe(++seq, hops); 833 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 834 (void) gettimeofday(&t2, NULL); 835 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 836 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 837 &lastaddr)) { 838 if (probe > 0) 839 fputs("\n ", stdout); 840 print(&rcvmhdr, cc); 841 lastaddr = Rcv.sin6_addr; 842 } 843 printf(" %.3f ms", deltaT(&t1, &t2)); 844 switch (i - 1) { 845 case ICMP6_DST_UNREACH_NOROUTE: 846 ++unreachable; 847 printf(" !N"); 848 break; 849 case ICMP6_DST_UNREACH_ADMIN: 850 ++unreachable; 851 printf(" !P"); 852 break; 853 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 854 ++unreachable; 855 printf(" !S"); 856 break; 857 case ICMP6_DST_UNREACH_ADDR: 858 ++unreachable; 859 printf(" !A"); 860 break; 861 case ICMP6_DST_UNREACH_NOPORT: 862 if (rcvhlim >= 0 && 863 rcvhlim <= 1) 864 printf(" !"); 865 ++got_there; 866 break; 867 } 868 break; 869 } 870 } 871 if (cc == 0) 872 printf(" *"); 873 (void) fflush(stdout); 874 } 875 putchar('\n'); 876 if (got_there || 877 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 878 exit(0); 879 } 880 } 881 882 exit(0); 883 } 884 885 int 886 wait_for_reply(int sock, struct msghdr *mhdr) 887 { 888 #ifdef HAVE_POLL 889 struct pollfd pfd[1]; 890 int cc = 0; 891 892 pfd[0].fd = sock; 893 pfd[0].events = POLLIN; 894 pfd[0].revents = 0; 895 896 if (poll(pfd, 1, waittime * 1000) > 0) 897 cc = recvmsg(rcvsock, mhdr, 0); 898 899 return(cc); 900 #else 901 fd_set *fdsp; 902 struct timeval wait; 903 int cc = 0, fdsn; 904 905 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 906 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 907 err(1, "malloc"); 908 memset(fdsp, 0, fdsn); 909 FD_SET(sock, fdsp); 910 wait.tv_sec = waittime; wait.tv_usec = 0; 911 912 if (select(sock+1, fdsp, NULL, NULL, &wait) > 0) 913 cc = recvmsg(rcvsock, mhdr, 0); 914 915 free(fdsp); 916 return(cc); 917 #endif 918 } 919 920 #ifdef IPSEC 921 #ifdef IPSEC_POLICY_IPSEC 922 int 923 setpolicy(int so, char *policy) 924 { 925 char *buf; 926 927 buf = ipsec_set_policy(policy, strlen(policy)); 928 if (buf == NULL) { 929 warnx("%s", ipsec_strerror()); 930 return -1; 931 } 932 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 933 buf, ipsec_get_policylen(buf)); 934 935 free(buf); 936 937 return 0; 938 } 939 #endif 940 #endif 941 942 void 943 send_probe(int seq, u_long hops) 944 { 945 struct icmp6_hdr *icp; 946 struct opacket *op; 947 struct timeval tv; 948 struct tv32 tv32; 949 int i; 950 951 i = hops; 952 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 953 (char *)&i, sizeof(i)) < 0) { 954 perror("setsockopt IPV6_UNICAST_HOPS"); 955 } 956 957 Dst.sin6_port = htons(port + seq); 958 (void) gettimeofday(&tv, NULL); 959 tv32.tv32_sec = htonl(tv.tv_sec); 960 tv32.tv32_usec = htonl(tv.tv_usec); 961 962 switch (useproto) { 963 case IPPROTO_ICMPV6: 964 icp = (struct icmp6_hdr *)outpacket; 965 966 icp->icmp6_type = ICMP6_ECHO_REQUEST; 967 icp->icmp6_code = 0; 968 icp->icmp6_cksum = 0; 969 icp->icmp6_id = ident; 970 icp->icmp6_seq = htons(seq); 971 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 972 sizeof(tv32)); 973 break; 974 case IPPROTO_UDP: 975 op = outpacket; 976 977 op->seq = seq; 978 op->hops = hops; 979 bcopy(&tv32, &op->tv, sizeof tv32); 980 break; 981 case IPPROTO_NONE: 982 /* No space for anything. No harm as seq/tv32 are decorative. */ 983 break; 984 default: 985 fprintf(stderr, "Unknown probe protocol %d.\n", useproto); 986 exit(1); 987 } 988 989 i = sendto(sndsock, (char *)outpacket, datalen, 0, 990 (struct sockaddr *)&Dst, Dst.sin6_len); 991 if (i < 0 || i != datalen) { 992 if (i < 0) 993 perror("sendto"); 994 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 995 hostname, datalen, i); 996 (void) fflush(stdout); 997 } 998 } 999 1000 int 1001 get_hoplim(struct msghdr *mhdr) 1002 { 1003 struct cmsghdr *cm; 1004 1005 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1006 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1007 if (cm->cmsg_level == IPPROTO_IPV6 && 1008 cm->cmsg_type == IPV6_HOPLIMIT && 1009 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1010 return(*(int *)CMSG_DATA(cm)); 1011 } 1012 1013 return(-1); 1014 } 1015 1016 double 1017 deltaT(struct timeval *t1p, struct timeval *t2p) 1018 { 1019 double dt; 1020 1021 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1022 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1023 return (dt); 1024 } 1025 1026 /* 1027 * Convert an ICMP "type" field to a printable string. 1028 */ 1029 char * 1030 pr_type(int t0) 1031 { 1032 u_char t = t0 & 0xff; 1033 char *cp; 1034 1035 switch (t) { 1036 case ICMP6_DST_UNREACH: 1037 cp = "Destination Unreachable"; 1038 break; 1039 case ICMP6_PACKET_TOO_BIG: 1040 cp = "Packet Too Big"; 1041 break; 1042 case ICMP6_TIME_EXCEEDED: 1043 cp = "Time Exceeded"; 1044 break; 1045 case ICMP6_PARAM_PROB: 1046 cp = "Parameter Problem"; 1047 break; 1048 case ICMP6_ECHO_REQUEST: 1049 cp = "Echo Request"; 1050 break; 1051 case ICMP6_ECHO_REPLY: 1052 cp = "Echo Reply"; 1053 break; 1054 case ICMP6_MEMBERSHIP_QUERY: 1055 cp = "Group Membership Query"; 1056 break; 1057 case ICMP6_MEMBERSHIP_REPORT: 1058 cp = "Group Membership Report"; 1059 break; 1060 case ICMP6_MEMBERSHIP_REDUCTION: 1061 cp = "Group Membership Reduction"; 1062 break; 1063 case ND_ROUTER_SOLICIT: 1064 cp = "Router Solicitation"; 1065 break; 1066 case ND_ROUTER_ADVERT: 1067 cp = "Router Advertisement"; 1068 break; 1069 case ND_NEIGHBOR_SOLICIT: 1070 cp = "Neighbor Solicitation"; 1071 break; 1072 case ND_NEIGHBOR_ADVERT: 1073 cp = "Neighbor Advertisement"; 1074 break; 1075 case ND_REDIRECT: 1076 cp = "Redirect"; 1077 break; 1078 default: 1079 cp = "Unknown"; 1080 break; 1081 } 1082 return cp; 1083 } 1084 1085 int 1086 packet_ok(struct msghdr *mhdr, int cc, int seq) 1087 { 1088 struct icmp6_hdr *icp; 1089 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1090 u_char type, code; 1091 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1092 struct cmsghdr *cm; 1093 int *hlimp; 1094 char hbuf[NI_MAXHOST]; 1095 1096 #ifdef OLDRAWSOCKET 1097 int hlen; 1098 struct ip6_hdr *ip; 1099 #endif 1100 1101 #ifdef OLDRAWSOCKET 1102 ip = (struct ip6_hdr *) buf; 1103 hlen = sizeof(struct ip6_hdr); 1104 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1105 if (verbose) { 1106 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1107 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1108 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1109 printf("packet too short (%d bytes) from %s\n", cc, 1110 hbuf); 1111 } 1112 return (0); 1113 } 1114 cc -= hlen; 1115 icp = (struct icmp6_hdr *)(buf + hlen); 1116 #else 1117 if (cc < sizeof(struct icmp6_hdr)) { 1118 if (verbose) { 1119 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1120 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1121 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1122 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1123 } 1124 return(0); 1125 } 1126 icp = (struct icmp6_hdr *)buf; 1127 #endif 1128 /* get optional information via advanced API */ 1129 rcvpktinfo = NULL; 1130 hlimp = NULL; 1131 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1132 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1133 if (cm->cmsg_level == IPPROTO_IPV6 && 1134 cm->cmsg_type == IPV6_PKTINFO && 1135 cm->cmsg_len == 1136 CMSG_LEN(sizeof(struct in6_pktinfo))) 1137 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1138 1139 if (cm->cmsg_level == IPPROTO_IPV6 && 1140 cm->cmsg_type == IPV6_HOPLIMIT && 1141 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1142 hlimp = (int *)CMSG_DATA(cm); 1143 } 1144 if (rcvpktinfo == NULL || hlimp == NULL) { 1145 warnx("failed to get received hop limit or packet info"); 1146 #if 0 1147 return(0); 1148 #else 1149 rcvhlim = 0; /*XXX*/ 1150 #endif 1151 } 1152 else 1153 rcvhlim = *hlimp; 1154 1155 type = icp->icmp6_type; 1156 code = icp->icmp6_code; 1157 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1158 || type == ICMP6_DST_UNREACH) { 1159 struct ip6_hdr *hip; 1160 void *up; 1161 1162 hip = (struct ip6_hdr *)(icp + 1); 1163 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) { 1164 if (verbose) 1165 warnx("failed to get upper layer header"); 1166 return(0); 1167 } 1168 switch (useproto) { 1169 case IPPROTO_ICMPV6: 1170 if (((struct icmp6_hdr *)up)->icmp6_id == ident && 1171 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1172 return (type == ICMP6_TIME_EXCEEDED ? 1173 -1 : code + 1); 1174 break; 1175 case IPPROTO_UDP: 1176 if (((struct udphdr *)up)->uh_sport == htons(srcport) && 1177 ((struct udphdr *)up)->uh_dport == htons(port + seq)) 1178 return (type == ICMP6_TIME_EXCEEDED ? 1179 -1 : code + 1); 1180 break; 1181 case IPPROTO_NONE: 1182 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1183 default: 1184 fprintf(stderr, "Unknown probe proto %d.\n", useproto); 1185 break; 1186 } 1187 } else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) { 1188 if (icp->icmp6_id == ident && 1189 icp->icmp6_seq == htons(seq)) 1190 return (ICMP6_DST_UNREACH_NOPORT + 1); 1191 } 1192 if (verbose) { 1193 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1194 u_int8_t *p; 1195 int i; 1196 1197 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1198 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1199 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1200 printf("\n%d bytes from %s to %s", cc, sbuf, 1201 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1202 dbuf, sizeof(dbuf)) : "?"); 1203 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1204 icp->icmp6_code); 1205 p = (u_int8_t *)(icp + 1); 1206 #define WIDTH 16 1207 for (i = 0; i < cc; i++) { 1208 if (i % WIDTH == 0) 1209 printf("%04x:", i); 1210 if (i % 4 == 0) 1211 printf(" "); 1212 printf("%02x", p[i]); 1213 if (i % WIDTH == WIDTH - 1) 1214 printf("\n"); 1215 } 1216 if (cc % WIDTH != 0) 1217 printf("\n"); 1218 } 1219 return(0); 1220 } 1221 1222 /* 1223 * Increment pointer until find the UDP or ICMP header. 1224 */ 1225 void * 1226 get_uphdr(struct ip6_hdr *ip6, u_char *lim) 1227 { 1228 u_char *cp = (u_char *)ip6, nh; 1229 int hlen; 1230 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */ 1231 1232 if (cp + sizeof(*ip6) > lim) 1233 return(NULL); 1234 1235 nh = ip6->ip6_nxt; 1236 cp += sizeof(struct ip6_hdr); 1237 1238 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) { 1239 switch (nh) { 1240 case IPPROTO_ESP: 1241 case IPPROTO_TCP: 1242 return(NULL); 1243 case IPPROTO_ICMPV6: 1244 return(useproto == nh ? cp : NULL); 1245 case IPPROTO_UDP: 1246 return(useproto == nh ? cp : NULL); 1247 case IPPROTO_NONE: 1248 return(useproto == nh ? none_hdr : NULL); 1249 case IPPROTO_FRAGMENT: 1250 hlen = sizeof(struct ip6_frag); 1251 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1252 break; 1253 case IPPROTO_AH: 1254 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1255 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1256 break; 1257 default: 1258 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1259 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1260 break; 1261 } 1262 1263 cp += hlen; 1264 } 1265 1266 return(NULL); 1267 } 1268 1269 void 1270 print(struct msghdr *mhdr, int cc) 1271 { 1272 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1273 char hbuf[NI_MAXHOST]; 1274 1275 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1276 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1277 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1278 if (nflag) 1279 printf(" %s", hbuf); 1280 else if (lflag) 1281 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1282 else 1283 printf(" %s", inetname((struct sockaddr *)from)); 1284 1285 if (verbose) { 1286 #ifdef OLDRAWSOCKET 1287 printf(" %d bytes to %s", cc, 1288 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1289 hbuf, sizeof(hbuf)) : "?"); 1290 #else 1291 printf(" %d bytes of data to %s", cc, 1292 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1293 hbuf, sizeof(hbuf)) : "?"); 1294 #endif 1295 } 1296 } 1297 1298 /* 1299 * Construct an Internet address representation. 1300 * If the nflag has been supplied, give 1301 * numeric value, otherwise try for symbolic name. 1302 */ 1303 const char * 1304 inetname(struct sockaddr *sa) 1305 { 1306 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1307 static int first = 1; 1308 char *cp; 1309 1310 if (first && !nflag) { 1311 first = 0; 1312 if (gethostname(domain, sizeof(domain)) == 0 && 1313 (cp = strchr(domain, '.'))) 1314 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1315 else 1316 domain[0] = 0; 1317 } 1318 cp = NULL; 1319 if (!nflag) { 1320 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1321 NI_NAMEREQD) == 0) { 1322 if ((cp = strchr(line, '.')) && 1323 !strcmp(cp + 1, domain)) 1324 *cp = 0; 1325 cp = line; 1326 } 1327 } 1328 if (cp) 1329 return cp; 1330 1331 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1332 NI_NUMERICHOST) != 0) 1333 strlcpy(line, "invalid", sizeof(line)); 1334 return line; 1335 } 1336 1337 void 1338 usage(void) 1339 { 1340 1341 fprintf(stderr, 1342 "usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1343 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1344 exit(1); 1345 } 1346