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 68 #ifndef lint 69 static char copyright[] = 70 "@(#) Copyright (c) 1990, 1993\n\ 71 The Regents of the University of California. All rights reserved.\n"; 72 #endif /* not lint */ 73 74 #ifndef lint 75 #if 0 76 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 77 #endif 78 static const char rcsid[] = 79 "$FreeBSD$"; 80 #endif /* not lint */ 81 82 /* 83 * traceroute host - trace the route ip packets follow going to "host". 84 * 85 * Attempt to trace the route an ip packet would follow to some 86 * internet host. We find out intermediate hops by launching probe 87 * packets with a small ttl (time to live) then listening for an 88 * icmp "time exceeded" reply from a gateway. We start our probes 89 * with a ttl of one and increase by one until we get an icmp "port 90 * unreachable" (which means we got to "host") or hit a max (which 91 * defaults to 30 hops & can be changed with the -m flag). Three 92 * probes (change with -q flag) are sent at each ttl setting and a 93 * line is printed showing the ttl, address of the gateway and 94 * round trip time of each probe. If the probe answers come from 95 * different gateways, the address of each responding system will 96 * be printed. If there is no response within a 5 sec. timeout 97 * interval (changed with the -w flag), a "*" is printed for that 98 * probe. 99 * 100 * Probe packets are UDP format. We don't want the destination 101 * host to process them so the destination port is set to an 102 * unlikely value (if some clod on the destination is using that 103 * value, it can be changed with the -p flag). 104 * 105 * A sample use might be: 106 * 107 * [yak 71]% traceroute nis.nsf.net. 108 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 109 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 110 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 111 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 112 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 113 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 114 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 115 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 116 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 117 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 118 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 119 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 120 * 121 * Note that lines 2 & 3 are the same. This is due to a buggy 122 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 123 * packets with a zero ttl. 124 * 125 * A more interesting example is: 126 * 127 * [yak 72]% traceroute allspice.lcs.mit.edu. 128 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 129 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 130 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 131 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 132 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 133 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 134 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 135 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 136 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 137 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 138 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 139 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 140 * 12 * * * 141 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 142 * 14 * * * 143 * 15 * * * 144 * 16 * * * 145 * 17 * * * 146 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 147 * 148 * (I start to see why I'm having so much trouble with mail to 149 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 150 * either don't send ICMP "time exceeded" messages or send them 151 * with a ttl too small to reach us. 14 - 17 are running the 152 * MIT C Gateway code that doesn't send "time exceeded"s. God 153 * only knows what's going on with 12. 154 * 155 * The silent gateway 12 in the above may be the result of a bug in 156 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 157 * sends an unreachable message using whatever ttl remains in the 158 * original datagram. Since, for gateways, the remaining ttl is 159 * zero, the icmp "time exceeded" is guaranteed to not make it back 160 * to us. The behavior of this bug is slightly more interesting 161 * when it appears on the destination system: 162 * 163 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 164 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 165 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 166 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 167 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 168 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 169 * 7 * * * 170 * 8 * * * 171 * 9 * * * 172 * 10 * * * 173 * 11 * * * 174 * 12 * * * 175 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 176 * 177 * Notice that there are 12 "gateways" (13 is the final 178 * destination) and exactly the last half of them are "missing". 179 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 180 * is using the ttl from our arriving datagram as the ttl in its 181 * icmp reply. So, the reply will time out on the return path 182 * (with no notice sent to anyone since icmp's aren't sent for 183 * icmp's) until we probe with a ttl that's at least twice the path 184 * length. I.e., rip is really only 7 hops away. A reply that 185 * returns with a ttl of 1 is a clue this problem exists. 186 * Traceroute prints a "!" after the time if the ttl is <= 1. 187 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 188 * non-standard (HPUX) software, expect to see this problem 189 * frequently and/or take care picking the target host of your 190 * probes. 191 * 192 * Other possible annotations after the time are !H, !N, !P (got a host, 193 * network or protocol unreachable, respectively), !S or !F (source 194 * route failed or fragmentation needed -- neither of these should 195 * ever occur and the associated gateway is busted if you see one). If 196 * almost all the probes result in some kind of unreachable, traceroute 197 * will give up and exit. 198 * 199 * Notes 200 * ----- 201 * This program must be run by root or be setuid. (I suggest that 202 * you *don't* make it setuid -- casual use could result in a lot 203 * of unnecessary traffic on our poor, congested nets.) 204 * 205 * This program requires a kernel mod that does not appear in any 206 * system available from Berkeley: A raw ip socket using proto 207 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 208 * opposed to data to be wrapped in an ip datagram). See the README 209 * file that came with the source to this program for a description 210 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 211 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 212 * MODIFIED TO RUN THIS PROGRAM. 213 * 214 * The udp port usage may appear bizarre (well, ok, it is bizarre). 215 * The problem is that an icmp message only contains 8 bytes of 216 * data from the original datagram. 8 bytes is the size of a udp 217 * header so, if we want to associate replies with the original 218 * datagram, the necessary information must be encoded into the 219 * udp header (the ip id could be used but there's no way to 220 * interlock with the kernel's assignment of ip id's and, anyway, 221 * it would have taken a lot more kernel hacking to allow this 222 * code to set the ip id). So, to allow two or more users to 223 * use traceroute simultaneously, we use this task's pid as the 224 * source port (the high bit is set to move the port number out 225 * of the "likely" range). To keep track of which probe is being 226 * replied to (so times and/or hop counts don't get confused by a 227 * reply that was delayed in transit), we increment the destination 228 * port number before each probe. 229 * 230 * Don't use this as a coding example. I was trying to find a 231 * routing problem and this code sort-of popped out after 48 hours 232 * without sleep. I was amazed it ever compiled, much less ran. 233 * 234 * I stole the idea for this program from Steve Deering. Since 235 * the first release, I've learned that had I attended the right 236 * IETF working group meetings, I also could have stolen it from Guy 237 * Almes or Matt Mathis. I don't know (or care) who came up with 238 * the idea first. I envy the originators' perspicacity and I'm 239 * glad they didn't keep the idea a secret. 240 * 241 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 242 * enhancements to the original distribution. 243 * 244 * I've hacked up a round-trip-route version of this that works by 245 * sending a loose-source-routed udp datagram through the destination 246 * back to yourself. Unfortunately, SO many gateways botch source 247 * routing, the thing is almost worthless. Maybe one day... 248 * 249 * -- Van Jacobson (van@helios.ee.lbl.gov) 250 * Tue Dec 20 03:50:13 PST 1988 251 */ 252 253 #include <sys/param.h> 254 #include <sys/time.h> 255 #include <sys/socket.h> 256 #include <sys/uio.h> 257 #include <sys/file.h> 258 #include <sys/ioctl.h> 259 #include <sys/sysctl.h> 260 261 #include <netinet/in.h> 262 263 #include <arpa/inet.h> 264 265 #include <netdb.h> 266 #include <stdio.h> 267 #include <err.h> 268 #ifdef HAVE_POLL 269 #include <poll.h> 270 #endif 271 #include <errno.h> 272 #include <stdlib.h> 273 #include <string.h> 274 #include <unistd.h> 275 276 #include <netinet/ip6.h> 277 #include <netinet/icmp6.h> 278 #include <netinet/udp.h> 279 280 #ifdef IPSEC 281 #include <net/route.h> 282 #include <netipsec/ipsec.h> 283 #endif 284 285 #define DUMMY_PORT 10010 286 287 #define MAXPACKET 65535 /* max ip packet size */ 288 289 #ifndef HAVE_GETIPNODEBYNAME 290 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 291 #define freehostent(x) 292 #endif 293 294 /* 295 * format of a (udp) probe packet. 296 */ 297 struct tv32 { 298 u_int32_t tv32_sec; 299 u_int32_t tv32_usec; 300 }; 301 302 struct opacket { 303 u_char seq; /* sequence number of this packet */ 304 u_char hops; /* hop limit of the packet */ 305 u_char pad[2]; 306 struct tv32 tv; /* time packet left */ 307 } __attribute__((__packed__)); 308 309 u_char packet[512]; /* last inbound (icmp) packet */ 310 struct opacket *outpacket; /* last output (udp) packet */ 311 312 int main(int, char *[]); 313 int wait_for_reply(int, struct msghdr *); 314 #ifdef IPSEC 315 #ifdef IPSEC_POLICY_IPSEC 316 int setpolicy(int so, char *policy); 317 #endif 318 #endif 319 void send_probe(int, u_long); 320 void *get_uphdr(struct ip6_hdr *, u_char *); 321 int get_hoplim(struct msghdr *); 322 double deltaT(struct timeval *, struct timeval *); 323 char *pr_type(int); 324 int packet_ok(struct msghdr *, int, int); 325 void print(struct msghdr *, int); 326 const char *inetname(struct sockaddr *); 327 void usage(void); 328 329 int rcvsock; /* receive (icmp) socket file descriptor */ 330 int sndsock; /* send (udp) socket file descriptor */ 331 332 struct msghdr rcvmhdr; 333 struct iovec rcviov[2]; 334 int rcvhlim; 335 struct in6_pktinfo *rcvpktinfo; 336 337 struct sockaddr_in6 Src, Dst, Rcv; 338 u_long datalen; /* How much data */ 339 #define ICMP6ECHOLEN 8 340 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 341 char rtbuf[2064]; 342 #ifdef USE_RFC2292BIS 343 struct ip6_rthdr *rth; 344 #endif 345 struct cmsghdr *cmsg; 346 347 char *source = 0; 348 char *hostname; 349 350 u_long nprobes = 3; 351 u_long first_hop = 1; 352 u_long max_hops = 30; 353 u_int16_t srcport; 354 u_int16_t port = 32768+666; /* start udp dest port # for probe packets */ 355 u_int16_t ident; 356 int options; /* socket options */ 357 int verbose; 358 int waittime = 5; /* time to wait for response (in seconds) */ 359 int nflag; /* print addresses numerically */ 360 int useproto = IPPROTO_UDP; /* protocol to use to send packet */ 361 int lflag; /* print both numerical address & hostname */ 362 363 int 364 main(argc, argv) 365 int argc; 366 char *argv[]; 367 { 368 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 369 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 370 int ch, i, on = 1, seq, rcvcmsglen, error, minlen; 371 struct addrinfo hints, *res; 372 static u_char *rcvcmsgbuf; 373 u_long probe, hops, lport; 374 struct hostent *hp; 375 size_t size; 376 uid_t uid; 377 378 /* 379 * Receive ICMP 380 */ 381 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 382 perror("socket(ICMPv6)"); 383 exit(5); 384 } 385 386 size = sizeof(i); 387 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 388 max_hops = i; 389 390 /* specify to tell receiving interface */ 391 #ifdef IPV6_RECVPKTINFO 392 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 393 sizeof(on)) < 0) 394 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 395 #else /* old adv. API */ 396 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 397 sizeof(on)) < 0) 398 err(1, "setsockopt(IPV6_PKTINFO)"); 399 #endif 400 401 /* specify to tell value of hoplimit field of received IP6 hdr */ 402 #ifdef IPV6_RECVHOPLIMIT 403 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 404 sizeof(on)) < 0) 405 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 406 #else /* old adv. API */ 407 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 408 sizeof(on)) < 0) 409 err(1, "setsockopt(IPV6_HOPLIMIT)"); 410 #endif 411 412 seq = 0; 413 414 while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1) 415 switch (ch) { 416 case 'd': 417 options |= SO_DEBUG; 418 break; 419 case 'f': 420 ep = NULL; 421 errno = 0; 422 first_hop = strtoul(optarg, &ep, 0); 423 if (errno || !*optarg || *ep || first_hop > 255) { 424 fprintf(stderr, 425 "traceroute6: invalid min hoplimit.\n"); 426 exit(1); 427 } 428 break; 429 case 'g': 430 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 431 if (hp == NULL) { 432 fprintf(stderr, 433 "traceroute6: unknown host %s\n", optarg); 434 exit(1); 435 } 436 #ifdef USE_RFC2292BIS 437 if (rth == NULL) { 438 /* 439 * XXX: We can't detect the number of 440 * intermediate nodes yet. 441 */ 442 if ((rth = inet6_rth_init((void *)rtbuf, 443 sizeof(rtbuf), IPV6_RTHDR_TYPE_0, 444 0)) == NULL) { 445 fprintf(stderr, 446 "inet6_rth_init failed.\n"); 447 exit(1); 448 } 449 } 450 if (inet6_rth_add((void *)rth, 451 (struct in6_addr *)hp->h_addr)) { 452 fprintf(stderr, 453 "inet6_rth_add failed for %s\n", 454 optarg); 455 exit(1); 456 } 457 #else /* old advanced API */ 458 if (cmsg == NULL) 459 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 460 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 461 IPV6_RTHDR_LOOSE); 462 #endif 463 freehostent(hp); 464 break; 465 case 'I': 466 useproto = IPPROTO_ICMPV6; 467 ident = htons(getpid() & 0xffff); /* same as ping6 */ 468 break; 469 case 'l': 470 lflag++; 471 break; 472 case 'm': 473 ep = NULL; 474 errno = 0; 475 max_hops = strtoul(optarg, &ep, 0); 476 if (errno || !*optarg || *ep || max_hops > 255) { 477 fprintf(stderr, 478 "traceroute6: invalid max hoplimit.\n"); 479 exit(1); 480 } 481 break; 482 case 'n': 483 nflag++; 484 break; 485 case 'N': 486 useproto = IPPROTO_NONE; 487 break; 488 case 'p': 489 ep = NULL; 490 errno = 0; 491 lport = strtoul(optarg, &ep, 0); 492 if (errno || !*optarg || *ep) { 493 fprintf(stderr, "traceroute6: invalid port.\n"); 494 exit(1); 495 } 496 if (lport == 0 || lport != (lport & 0xffff)) { 497 fprintf(stderr, 498 "traceroute6: port out of range.\n"); 499 exit(1); 500 } 501 port = lport & 0xffff; 502 break; 503 case 'q': 504 ep = NULL; 505 errno = 0; 506 nprobes = strtoul(optarg, &ep, 0); 507 if (errno || !*optarg || *ep) { 508 fprintf(stderr, 509 "traceroute6: invalid nprobes.\n"); 510 exit(1); 511 } 512 if (nprobes < 1) { 513 fprintf(stderr, 514 "traceroute6: nprobes must be >0.\n"); 515 exit(1); 516 } 517 break; 518 case 'r': 519 options |= SO_DONTROUTE; 520 break; 521 case 's': 522 /* 523 * set the ip source address of the outbound 524 * probe (e.g., on a multi-homed host). 525 */ 526 source = optarg; 527 break; 528 case 'v': 529 verbose++; 530 break; 531 case 'U': 532 useproto = IPPROTO_UDP; 533 break; 534 case 'w': 535 ep = NULL; 536 errno = 0; 537 waittime = strtoul(optarg, &ep, 0); 538 if (errno || !*optarg || *ep) { 539 fprintf(stderr, 540 "traceroute6: invalid wait time.\n"); 541 exit(1); 542 } 543 if (waittime < 1) { 544 fprintf(stderr, 545 "traceroute6: wait must be >= 1 sec.\n"); 546 exit(1); 547 } 548 break; 549 default: 550 usage(); 551 } 552 argc -= optind; 553 argv += optind; 554 555 /* 556 * Open socket to send probe packets. 557 */ 558 switch (useproto) { 559 case IPPROTO_ICMPV6: 560 sndsock = rcvsock; 561 break; 562 case IPPROTO_UDP: 563 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 564 perror("socket(SOCK_DGRAM)"); 565 exit(5); 566 } 567 break; 568 case IPPROTO_NONE: 569 if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) { 570 perror("socket(SOCK_RAW)"); 571 exit(5); 572 } 573 break; 574 default: 575 fprintf(stderr, "traceroute6: unknown probe protocol %d", 576 useproto); 577 exit(5); 578 } 579 if (max_hops < first_hop) { 580 fprintf(stderr, 581 "traceroute6: max hoplimit must be larger than first hoplimit.\n"); 582 exit(1); 583 } 584 585 /* revoke privs */ 586 uid = getuid(); 587 if (setresuid(uid, uid, uid) == -1) { 588 perror("setresuid"); 589 exit(1); 590 } 591 592 593 if (argc < 1 || argc > 2) 594 usage(); 595 596 #if 1 597 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 598 #else 599 setlinebuf(stdout); 600 #endif 601 602 memset(&hints, 0, sizeof(hints)); 603 hints.ai_family = PF_INET6; 604 hints.ai_socktype = SOCK_RAW; 605 hints.ai_protocol = IPPROTO_ICMPV6; 606 hints.ai_flags = AI_CANONNAME; 607 error = getaddrinfo(*argv, NULL, &hints, &res); 608 if (error) { 609 fprintf(stderr, 610 "traceroute6: %s\n", gai_strerror(error)); 611 exit(1); 612 } 613 if (res->ai_addrlen != sizeof(Dst)) { 614 fprintf(stderr, 615 "traceroute6: size of sockaddr mismatch\n"); 616 exit(1); 617 } 618 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 619 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 620 if (!hostname) { 621 fprintf(stderr, "traceroute6: not enough core\n"); 622 exit(1); 623 } 624 if (res->ai_next) { 625 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 626 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 627 strlcpy(hbuf, "?", sizeof(hbuf)); 628 fprintf(stderr, "traceroute6: Warning: %s has multiple " 629 "addresses; using %s\n", hostname, hbuf); 630 } 631 632 if (*++argv) { 633 ep = NULL; 634 errno = 0; 635 datalen = strtoul(*argv, &ep, 0); 636 if (errno || !*argv || *ep) { 637 fprintf(stderr, 638 "traceroute6: invalid packet length.\n"); 639 exit(1); 640 } 641 } 642 switch (useproto) { 643 case IPPROTO_ICMPV6: 644 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 645 break; 646 case IPPROTO_UDP: 647 minlen = sizeof(struct opacket); 648 break; 649 case IPPROTO_NONE: 650 minlen = 0; 651 datalen = 0; 652 break; 653 default: 654 fprintf(stderr, "traceroute6: unknown probe protocol %d.\n", 655 useproto); 656 exit(1); 657 } 658 if (datalen < minlen) 659 datalen = minlen; 660 else if (datalen >= MAXPACKET) { 661 fprintf(stderr, 662 "traceroute6: packet size must be %d <= s < %ld.\n", 663 minlen, (long)MAXPACKET); 664 exit(1); 665 } 666 outpacket = (struct opacket *)malloc((unsigned)datalen); 667 if (!outpacket) { 668 perror("malloc"); 669 exit(1); 670 } 671 (void) bzero((char *)outpacket, datalen); 672 673 /* initialize msghdr for receiving packets */ 674 rcviov[0].iov_base = (caddr_t)packet; 675 rcviov[0].iov_len = sizeof(packet); 676 rcvmhdr.msg_name = (caddr_t)&Rcv; 677 rcvmhdr.msg_namelen = sizeof(Rcv); 678 rcvmhdr.msg_iov = rcviov; 679 rcvmhdr.msg_iovlen = 1; 680 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 681 CMSG_SPACE(sizeof(int)); 682 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 683 fprintf(stderr, "traceroute6: malloc failed\n"); 684 exit(1); 685 } 686 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 687 rcvmhdr.msg_controllen = rcvcmsglen; 688 689 if (options & SO_DEBUG) 690 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 691 (char *)&on, sizeof(on)); 692 if (options & SO_DONTROUTE) 693 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 694 (char *)&on, sizeof(on)); 695 #ifdef IPSEC 696 #ifdef IPSEC_POLICY_IPSEC 697 /* 698 * do not raise error even if setsockopt fails, kernel may have ipsec 699 * turned off. 700 */ 701 if (setpolicy(rcvsock, "in bypass") < 0) 702 errx(1, "%s", ipsec_strerror()); 703 if (setpolicy(rcvsock, "out bypass") < 0) 704 errx(1, "%s", ipsec_strerror()); 705 #else 706 { 707 int level = IPSEC_LEVEL_NONE; 708 709 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 710 sizeof(level)); 711 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 712 sizeof(level)); 713 #ifdef IP_AUTH_TRANS_LEVEL 714 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 715 sizeof(level)); 716 #else 717 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 718 sizeof(level)); 719 #endif 720 #ifdef IP_AUTH_NETWORK_LEVEL 721 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 722 sizeof(level)); 723 #endif 724 } 725 #endif /*IPSEC_POLICY_IPSEC*/ 726 #endif /*IPSEC*/ 727 728 #ifdef SO_SNDBUF 729 i = datalen; 730 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 731 sizeof(i)) < 0 && useproto != IPPROTO_NONE) { 732 perror("setsockopt(SO_SNDBUF)"); 733 exit(6); 734 } 735 #endif /* SO_SNDBUF */ 736 if (options & SO_DEBUG) 737 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 738 (char *)&on, sizeof(on)); 739 if (options & SO_DONTROUTE) 740 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 741 (char *)&on, sizeof(on)); 742 #ifdef USE_RFC2292BIS 743 if (rth) {/* XXX: there is no library to finalize the header... */ 744 rth->ip6r_len = rth->ip6r_segleft * 2; 745 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 746 (void *)rth, (rth->ip6r_len + 1) << 3)) { 747 fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 748 strerror(errno)); 749 exit(1); 750 } 751 } 752 #else /* old advanced API */ 753 if (cmsg != NULL) { 754 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 755 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 756 rtbuf, cmsg->cmsg_len) < 0) { 757 fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 758 strerror(errno)); 759 exit(1); 760 } 761 } 762 #endif /* USE_RFC2292BIS */ 763 #ifdef IPSEC 764 #ifdef IPSEC_POLICY_IPSEC 765 /* 766 * do not raise error even if setsockopt fails, kernel may have ipsec 767 * turned off. 768 */ 769 if (setpolicy(sndsock, "in bypass") < 0) 770 errx(1, "%s", ipsec_strerror()); 771 if (setpolicy(sndsock, "out bypass") < 0) 772 errx(1, "%s", ipsec_strerror()); 773 #else 774 { 775 int level = IPSEC_LEVEL_BYPASS; 776 777 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 778 sizeof(level)); 779 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 780 sizeof(level)); 781 #ifdef IP_AUTH_TRANS_LEVEL 782 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 783 sizeof(level)); 784 #else 785 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 786 sizeof(level)); 787 #endif 788 #ifdef IP_AUTH_NETWORK_LEVEL 789 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 790 sizeof(level)); 791 #endif 792 } 793 #endif /*IPSEC_POLICY_IPSEC*/ 794 #endif /*IPSEC*/ 795 796 /* 797 * Source selection 798 */ 799 bzero(&Src, sizeof(Src)); 800 if (source) { 801 struct addrinfo hints, *res; 802 int error; 803 804 memset(&hints, 0, sizeof(hints)); 805 hints.ai_family = AF_INET6; 806 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 807 hints.ai_flags = AI_NUMERICHOST; 808 error = getaddrinfo(source, "0", &hints, &res); 809 if (error) { 810 printf("traceroute6: %s: %s\n", source, 811 gai_strerror(error)); 812 exit(1); 813 } 814 if (res->ai_addrlen > sizeof(Src)) { 815 printf("traceroute6: %s: %s\n", source, 816 gai_strerror(error)); 817 exit(1); 818 } 819 memcpy(&Src, res->ai_addr, res->ai_addrlen); 820 freeaddrinfo(res); 821 } else { 822 struct sockaddr_in6 Nxt; 823 int dummy; 824 socklen_t len; 825 826 Nxt = Dst; 827 Nxt.sin6_port = htons(DUMMY_PORT); 828 if (cmsg != NULL) 829 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 830 sizeof(Nxt.sin6_addr)); 831 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 832 perror("socket"); 833 exit(1); 834 } 835 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 836 perror("connect"); 837 exit(1); 838 } 839 len = sizeof(Src); 840 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 841 perror("getsockname"); 842 exit(1); 843 } 844 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 845 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) { 846 fprintf(stderr, "getnameinfo failed for source\n"); 847 exit(1); 848 } 849 source = src0; 850 close(dummy); 851 } 852 853 Src.sin6_port = htons(0); 854 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 855 perror("bind"); 856 exit(1); 857 } 858 859 { 860 socklen_t len; 861 862 len = sizeof(Src); 863 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) { 864 perror("getsockname"); 865 exit(1); 866 } 867 srcport = ntohs(Src.sin6_port); 868 } 869 870 /* 871 * Message to users 872 */ 873 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 874 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 875 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 876 fprintf(stderr, "traceroute6"); 877 fprintf(stderr, " to %s (%s)", hostname, hbuf); 878 if (source) 879 fprintf(stderr, " from %s", source); 880 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 881 max_hops, datalen); 882 (void) fflush(stderr); 883 884 if (first_hop > 1) 885 printf("Skipping %lu intermediate hops\n", first_hop - 1); 886 887 /* 888 * Main loop 889 */ 890 for (hops = first_hop; hops <= max_hops; ++hops) { 891 struct in6_addr lastaddr; 892 int got_there = 0; 893 int unreachable = 0; 894 895 printf("%2lu ", hops); 896 bzero(&lastaddr, sizeof(lastaddr)); 897 for (probe = 0; probe < nprobes; ++probe) { 898 int cc; 899 struct timeval t1, t2; 900 901 (void) gettimeofday(&t1, NULL); 902 send_probe(++seq, hops); 903 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 904 (void) gettimeofday(&t2, NULL); 905 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 906 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 907 &lastaddr)) { 908 if (probe > 0) 909 fputs("\n ", stdout); 910 print(&rcvmhdr, cc); 911 lastaddr = Rcv.sin6_addr; 912 } 913 printf(" %.3f ms", deltaT(&t1, &t2)); 914 switch (i - 1) { 915 case ICMP6_DST_UNREACH_NOROUTE: 916 ++unreachable; 917 printf(" !N"); 918 break; 919 case ICMP6_DST_UNREACH_ADMIN: 920 ++unreachable; 921 printf(" !P"); 922 break; 923 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 924 ++unreachable; 925 printf(" !S"); 926 break; 927 case ICMP6_DST_UNREACH_ADDR: 928 ++unreachable; 929 printf(" !A"); 930 break; 931 case ICMP6_DST_UNREACH_NOPORT: 932 if (rcvhlim >= 0 && 933 rcvhlim <= 1) 934 printf(" !"); 935 ++got_there; 936 break; 937 } 938 break; 939 } 940 } 941 if (cc == 0) 942 printf(" *"); 943 (void) fflush(stdout); 944 } 945 putchar('\n'); 946 if (got_there || 947 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 948 exit(0); 949 } 950 } 951 952 exit(0); 953 } 954 955 int 956 wait_for_reply(sock, mhdr) 957 int sock; 958 struct msghdr *mhdr; 959 { 960 #ifdef HAVE_POLL 961 struct pollfd pfd[1]; 962 int cc = 0; 963 964 pfd[0].fd = sock; 965 pfd[0].events = POLLIN; 966 pfd[0].revents = 0; 967 968 if (poll(pfd, 1, waittime * 1000) > 0) 969 cc = recvmsg(rcvsock, mhdr, 0); 970 971 return(cc); 972 #else 973 fd_set *fdsp; 974 struct timeval wait; 975 int cc = 0, fdsn; 976 977 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 978 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 979 err(1, "malloc"); 980 memset(fdsp, 0, fdsn); 981 FD_SET(sock, fdsp); 982 wait.tv_sec = waittime; wait.tv_usec = 0; 983 984 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 985 cc = recvmsg(rcvsock, mhdr, 0); 986 987 free(fdsp); 988 return(cc); 989 #endif 990 } 991 992 #ifdef IPSEC 993 #ifdef IPSEC_POLICY_IPSEC 994 int 995 setpolicy(so, policy) 996 int so; 997 char *policy; 998 { 999 char *buf; 1000 1001 buf = ipsec_set_policy(policy, strlen(policy)); 1002 if (buf == NULL) { 1003 warnx("%s", ipsec_strerror()); 1004 return -1; 1005 } 1006 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 1007 buf, ipsec_get_policylen(buf)); 1008 1009 free(buf); 1010 1011 return 0; 1012 } 1013 #endif 1014 #endif 1015 1016 void 1017 send_probe(seq, hops) 1018 int seq; 1019 u_long hops; 1020 { 1021 struct icmp6_hdr *icp; 1022 struct opacket *op; 1023 struct timeval tv; 1024 struct tv32 tv32; 1025 int i; 1026 1027 i = hops; 1028 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 1029 (char *)&i, sizeof(i)) < 0) { 1030 perror("setsockopt IPV6_UNICAST_HOPS"); 1031 } 1032 1033 Dst.sin6_port = htons(port + seq); 1034 (void) gettimeofday(&tv, NULL); 1035 tv32.tv32_sec = htonl(tv.tv_sec); 1036 tv32.tv32_usec = htonl(tv.tv_usec); 1037 1038 switch (useproto) { 1039 case IPPROTO_ICMPV6: 1040 icp = (struct icmp6_hdr *)outpacket; 1041 1042 icp->icmp6_type = ICMP6_ECHO_REQUEST; 1043 icp->icmp6_code = 0; 1044 icp->icmp6_cksum = 0; 1045 icp->icmp6_id = ident; 1046 icp->icmp6_seq = htons(seq); 1047 bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN), 1048 sizeof(tv32)); 1049 break; 1050 case IPPROTO_UDP: 1051 op = outpacket; 1052 1053 op->seq = seq; 1054 op->hops = hops; 1055 bcopy(&tv32, &op->tv, sizeof tv32); 1056 break; 1057 case IPPROTO_NONE: 1058 /* No space for anything. No harm as seq/tv32 are decorative. */ 1059 break; 1060 default: 1061 fprintf(stderr, "Unknown probe protocol %d.\n", useproto); 1062 exit(1); 1063 } 1064 1065 i = sendto(sndsock, (char *)outpacket, datalen, 0, 1066 (struct sockaddr *)&Dst, Dst.sin6_len); 1067 if (i < 0 || i != datalen) { 1068 if (i < 0) 1069 perror("sendto"); 1070 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 1071 hostname, datalen, i); 1072 (void) fflush(stdout); 1073 } 1074 } 1075 1076 int 1077 get_hoplim(mhdr) 1078 struct msghdr *mhdr; 1079 { 1080 struct cmsghdr *cm; 1081 1082 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1083 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1084 if (cm->cmsg_level == IPPROTO_IPV6 && 1085 cm->cmsg_type == IPV6_HOPLIMIT && 1086 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1087 return(*(int *)CMSG_DATA(cm)); 1088 } 1089 1090 return(-1); 1091 } 1092 1093 double 1094 deltaT(t1p, t2p) 1095 struct timeval *t1p, *t2p; 1096 { 1097 double dt; 1098 1099 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1100 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1101 return (dt); 1102 } 1103 1104 /* 1105 * Convert an ICMP "type" field to a printable string. 1106 */ 1107 char * 1108 pr_type(t0) 1109 int t0; 1110 { 1111 u_char t = t0 & 0xff; 1112 char *cp; 1113 1114 switch (t) { 1115 case ICMP6_DST_UNREACH: 1116 cp = "Destination Unreachable"; 1117 break; 1118 case ICMP6_PACKET_TOO_BIG: 1119 cp = "Packet Too Big"; 1120 break; 1121 case ICMP6_TIME_EXCEEDED: 1122 cp = "Time Exceeded"; 1123 break; 1124 case ICMP6_PARAM_PROB: 1125 cp = "Parameter Problem"; 1126 break; 1127 case ICMP6_ECHO_REQUEST: 1128 cp = "Echo Request"; 1129 break; 1130 case ICMP6_ECHO_REPLY: 1131 cp = "Echo Reply"; 1132 break; 1133 case ICMP6_MEMBERSHIP_QUERY: 1134 cp = "Group Membership Query"; 1135 break; 1136 case ICMP6_MEMBERSHIP_REPORT: 1137 cp = "Group Membership Report"; 1138 break; 1139 case ICMP6_MEMBERSHIP_REDUCTION: 1140 cp = "Group Membership Reduction"; 1141 break; 1142 case ND_ROUTER_SOLICIT: 1143 cp = "Router Solicitation"; 1144 break; 1145 case ND_ROUTER_ADVERT: 1146 cp = "Router Advertisement"; 1147 break; 1148 case ND_NEIGHBOR_SOLICIT: 1149 cp = "Neighbor Solicitation"; 1150 break; 1151 case ND_NEIGHBOR_ADVERT: 1152 cp = "Neighbor Advertisement"; 1153 break; 1154 case ND_REDIRECT: 1155 cp = "Redirect"; 1156 break; 1157 default: 1158 cp = "Unknown"; 1159 break; 1160 } 1161 return cp; 1162 } 1163 1164 int 1165 packet_ok(mhdr, cc, seq) 1166 struct msghdr *mhdr; 1167 int cc; 1168 int seq; 1169 { 1170 struct icmp6_hdr *icp; 1171 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1172 u_char type, code; 1173 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1174 struct cmsghdr *cm; 1175 int *hlimp; 1176 char hbuf[NI_MAXHOST]; 1177 1178 #ifdef OLDRAWSOCKET 1179 int hlen; 1180 struct ip6_hdr *ip; 1181 #endif 1182 1183 #ifdef OLDRAWSOCKET 1184 ip = (struct ip6_hdr *) buf; 1185 hlen = sizeof(struct ip6_hdr); 1186 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1187 if (verbose) { 1188 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1189 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1190 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1191 printf("packet too short (%d bytes) from %s\n", cc, 1192 hbuf); 1193 } 1194 return (0); 1195 } 1196 cc -= hlen; 1197 icp = (struct icmp6_hdr *)(buf + hlen); 1198 #else 1199 if (cc < sizeof(struct icmp6_hdr)) { 1200 if (verbose) { 1201 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1202 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1203 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1204 printf("data too short (%d bytes) from %s\n", cc, hbuf); 1205 } 1206 return(0); 1207 } 1208 icp = (struct icmp6_hdr *)buf; 1209 #endif 1210 /* get optional information via advanced API */ 1211 rcvpktinfo = NULL; 1212 hlimp = NULL; 1213 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1214 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1215 if (cm->cmsg_level == IPPROTO_IPV6 && 1216 cm->cmsg_type == IPV6_PKTINFO && 1217 cm->cmsg_len == 1218 CMSG_LEN(sizeof(struct in6_pktinfo))) 1219 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1220 1221 if (cm->cmsg_level == IPPROTO_IPV6 && 1222 cm->cmsg_type == IPV6_HOPLIMIT && 1223 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1224 hlimp = (int *)CMSG_DATA(cm); 1225 } 1226 if (rcvpktinfo == NULL || hlimp == NULL) { 1227 warnx("failed to get received hop limit or packet info"); 1228 #if 0 1229 return(0); 1230 #else 1231 rcvhlim = 0; /*XXX*/ 1232 #endif 1233 } 1234 else 1235 rcvhlim = *hlimp; 1236 1237 type = icp->icmp6_type; 1238 code = icp->icmp6_code; 1239 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1240 || type == ICMP6_DST_UNREACH) { 1241 struct ip6_hdr *hip; 1242 void *up; 1243 1244 hip = (struct ip6_hdr *)(icp + 1); 1245 if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) { 1246 if (verbose) 1247 warnx("failed to get upper layer header"); 1248 return(0); 1249 } 1250 switch (useproto) { 1251 case IPPROTO_ICMPV6: 1252 if (((struct icmp6_hdr *)up)->icmp6_id == ident && 1253 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1254 return (type == ICMP6_TIME_EXCEEDED ? 1255 -1 : code + 1); 1256 break; 1257 case IPPROTO_UDP: 1258 if (((struct udphdr *)up)->uh_sport == htons(srcport) && 1259 ((struct udphdr *)up)->uh_dport == htons(port + seq)) 1260 return (type == ICMP6_TIME_EXCEEDED ? 1261 -1 : code + 1); 1262 break; 1263 case IPPROTO_NONE: 1264 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1265 default: 1266 fprintf(stderr, "Unknown probe proto %d.\n", useproto); 1267 break; 1268 } 1269 } else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) { 1270 if (icp->icmp6_id == ident && 1271 icp->icmp6_seq == htons(seq)) 1272 return (ICMP6_DST_UNREACH_NOPORT + 1); 1273 } 1274 if (verbose) { 1275 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1276 u_int8_t *p; 1277 int i; 1278 1279 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1280 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1281 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1282 printf("\n%d bytes from %s to %s", cc, sbuf, 1283 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1284 dbuf, sizeof(dbuf)) : "?"); 1285 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1286 icp->icmp6_code); 1287 p = (u_int8_t *)(icp + 1); 1288 #define WIDTH 16 1289 for (i = 0; i < cc; i++) { 1290 if (i % WIDTH == 0) 1291 printf("%04x:", i); 1292 if (i % 4 == 0) 1293 printf(" "); 1294 printf("%02x", p[i]); 1295 if (i % WIDTH == WIDTH - 1) 1296 printf("\n"); 1297 } 1298 if (cc % WIDTH != 0) 1299 printf("\n"); 1300 } 1301 return(0); 1302 } 1303 1304 /* 1305 * Increment pointer until find the UDP or ICMP header. 1306 */ 1307 void * 1308 get_uphdr(ip6, lim) 1309 struct ip6_hdr *ip6; 1310 u_char *lim; 1311 { 1312 u_char *cp = (u_char *)ip6, nh; 1313 int hlen; 1314 static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */ 1315 1316 if (cp + sizeof(*ip6) > lim) 1317 return(NULL); 1318 1319 nh = ip6->ip6_nxt; 1320 cp += sizeof(struct ip6_hdr); 1321 1322 while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) { 1323 switch (nh) { 1324 case IPPROTO_ESP: 1325 case IPPROTO_TCP: 1326 return(NULL); 1327 case IPPROTO_ICMPV6: 1328 return(useproto == nh ? cp : NULL); 1329 case IPPROTO_UDP: 1330 return(useproto == nh ? cp : NULL); 1331 case IPPROTO_NONE: 1332 return(useproto == nh ? none_hdr : NULL); 1333 case IPPROTO_FRAGMENT: 1334 hlen = sizeof(struct ip6_frag); 1335 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1336 break; 1337 case IPPROTO_AH: 1338 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1339 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1340 break; 1341 default: 1342 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1343 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1344 break; 1345 } 1346 1347 cp += hlen; 1348 } 1349 1350 return(NULL); 1351 } 1352 1353 void 1354 print(mhdr, cc) 1355 struct msghdr *mhdr; 1356 int cc; 1357 { 1358 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1359 char hbuf[NI_MAXHOST]; 1360 1361 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1362 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1363 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1364 if (nflag) 1365 printf(" %s", hbuf); 1366 else if (lflag) 1367 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1368 else 1369 printf(" %s", inetname((struct sockaddr *)from)); 1370 1371 if (verbose) { 1372 #ifdef OLDRAWSOCKET 1373 printf(" %d bytes to %s", cc, 1374 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1375 hbuf, sizeof(hbuf)) : "?"); 1376 #else 1377 printf(" %d bytes of data to %s", cc, 1378 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1379 hbuf, sizeof(hbuf)) : "?"); 1380 #endif 1381 } 1382 } 1383 1384 /* 1385 * Construct an Internet address representation. 1386 * If the nflag has been supplied, give 1387 * numeric value, otherwise try for symbolic name. 1388 */ 1389 const char * 1390 inetname(sa) 1391 struct sockaddr *sa; 1392 { 1393 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1394 static int first = 1; 1395 char *cp; 1396 1397 if (first && !nflag) { 1398 first = 0; 1399 if (gethostname(domain, sizeof(domain)) == 0 && 1400 (cp = strchr(domain, '.'))) 1401 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1402 else 1403 domain[0] = 0; 1404 } 1405 cp = NULL; 1406 if (!nflag) { 1407 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1408 NI_NAMEREQD) == 0) { 1409 if ((cp = strchr(line, '.')) && 1410 !strcmp(cp + 1, domain)) 1411 *cp = 0; 1412 cp = line; 1413 } 1414 } 1415 if (cp) 1416 return cp; 1417 1418 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1419 NI_NUMERICHOST) != 0) 1420 strlcpy(line, "invalid", sizeof(line)); 1421 return line; 1422 } 1423 1424 void 1425 usage() 1426 { 1427 1428 fprintf(stderr, 1429 "usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n" 1430 " [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1431 exit(1); 1432 } 1433