1 /* $KAME: traceroute6.c,v 1.42 2001/05/08 04:36:41 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#) Copyright (c) 1990, 1993 The Regents of the University of California. All rights reserved. 32 * @(#)traceroute.c 8.1 (Berkeley) 6/6/93 33 * $FreeBSD: src/usr.sbin/traceroute6/traceroute6.c,v 1.4.2.4 2001/07/03 11:02:18 ume Exp $ 34 * $DragonFly: src/usr.sbin/traceroute6/traceroute6.c,v 1.7 2007/10/25 08:12:42 hasso Exp $ 35 */ 36 37 /*- 38 * Copyright (c) 1990, 1993 39 * The Regents of the University of California. All rights reserved. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * Van Jacobson. 43 * 44 * Redistribution and use in source and binary forms, with or without 45 * modification, are permitted provided that the following conditions 46 * are met: 47 * 1. Redistributions of source code must retain the above copyright 48 * notice, this list of conditions and the following disclaimer. 49 * 2. Redistributions in binary form must reproduce the above copyright 50 * notice, this list of conditions and the following disclaimer in the 51 * documentation and/or other materials provided with the distribution. 52 * 3. All advertising materials mentioning features or use of this software 53 * must display the following acknowledgement: 54 * This product includes software developed by the University of 55 * California, Berkeley and its contributors. 56 * 4. Neither the name of the University nor the names of its contributors 57 * may be used to endorse or promote products derived from this software 58 * without specific prior written permission. 59 * 60 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 61 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 62 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 63 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 64 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 65 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 66 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 67 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 68 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 69 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 70 * SUCH DAMAGE. 71 */ 72 73 /* 74 * traceroute host - trace the route ip packets follow going to "host". 75 * 76 * Attempt to trace the route an ip packet would follow to some 77 * internet host. We find out intermediate hops by launching probe 78 * packets with a small ttl (time to live) then listening for an 79 * icmp "time exceeded" reply from a gateway. We start our probes 80 * with a ttl of one and increase by one until we get an icmp "port 81 * unreachable" (which means we got to "host") or hit a max (which 82 * defaults to 30 hops & can be changed with the -m flag). Three 83 * probes (change with -q flag) are sent at each ttl setting and a 84 * line is printed showing the ttl, address of the gateway and 85 * round trip time of each probe. If the probe answers come from 86 * different gateways, the address of each responding system will 87 * be printed. If there is no response within a 5 sec. timeout 88 * interval (changed with the -w flag), a "*" is printed for that 89 * probe. 90 * 91 * Probe packets are UDP format. We don't want the destination 92 * host to process them so the destination port is set to an 93 * unlikely value (if some clod on the destination is using that 94 * value, it can be changed with the -p flag). 95 * 96 * A sample use might be: 97 * 98 * [yak 71]% traceroute nis.nsf.net. 99 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 100 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 101 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 102 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 103 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 104 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 105 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 106 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 107 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 108 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 109 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 110 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 111 * 112 * Note that lines 2 & 3 are the same. This is due to a buggy 113 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 114 * packets with a zero ttl. 115 * 116 * A more interesting example is: 117 * 118 * [yak 72]% traceroute allspice.lcs.mit.edu. 119 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 120 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 121 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 122 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 123 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 124 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 125 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 126 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 127 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 128 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 129 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 130 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 131 * 12 * * * 132 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 133 * 14 * * * 134 * 15 * * * 135 * 16 * * * 136 * 17 * * * 137 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 138 * 139 * (I start to see why I'm having so much trouble with mail to 140 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 141 * either don't send ICMP "time exceeded" messages or send them 142 * with a ttl too small to reach us. 14 - 17 are running the 143 * MIT C Gateway code that doesn't send "time exceeded"s. God 144 * only knows what's going on with 12. 145 * 146 * The silent gateway 12 in the above may be the result of a bug in 147 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 148 * sends an unreachable message using whatever ttl remains in the 149 * original datagram. Since, for gateways, the remaining ttl is 150 * zero, the icmp "time exceeded" is guaranteed to not make it back 151 * to us. The behavior of this bug is slightly more interesting 152 * when it appears on the destination system: 153 * 154 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 155 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 156 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 157 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 158 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 159 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 160 * 7 * * * 161 * 8 * * * 162 * 9 * * * 163 * 10 * * * 164 * 11 * * * 165 * 12 * * * 166 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 167 * 168 * Notice that there are 12 "gateways" (13 is the final 169 * destination) and exactly the last half of them are "missing". 170 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 171 * is using the ttl from our arriving datagram as the ttl in its 172 * icmp reply. So, the reply will time out on the return path 173 * (with no notice sent to anyone since icmp's aren't sent for 174 * icmp's) until we probe with a ttl that's at least twice the path 175 * length. I.e., rip is really only 7 hops away. A reply that 176 * returns with a ttl of 1 is a clue this problem exists. 177 * Traceroute prints a "!" after the time if the ttl is <= 1. 178 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 179 * non-standard (HPUX) software, expect to see this problem 180 * frequently and/or take care picking the target host of your 181 * probes. 182 * 183 * Other possible annotations after the time are !H, !N, !P (got a host, 184 * network or protocol unreachable, respectively), !S or !F (source 185 * route failed or fragmentation needed -- neither of these should 186 * ever occur and the associated gateway is busted if you see one). If 187 * almost all the probes result in some kind of unreachable, traceroute 188 * will give up and exit. 189 * 190 * Notes 191 * ----- 192 * This program must be run by root or be setuid. (I suggest that 193 * you *don't* make it setuid -- casual use could result in a lot 194 * of unnecessary traffic on our poor, congested nets.) 195 * 196 * This program requires a kernel mod that does not appear in any 197 * system available from Berkeley: A raw ip socket using proto 198 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 199 * opposed to data to be wrapped in a ip datagram). See the README 200 * file that came with the source to this program for a description 201 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 202 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 203 * MODIFIED TO RUN THIS PROGRAM. 204 * 205 * The udp port usage may appear bizarre (well, ok, it is bizarre). 206 * The problem is that an icmp message only contains 8 bytes of 207 * data from the original datagram. 8 bytes is the size of a udp 208 * header so, if we want to associate replies with the original 209 * datagram, the necessary information must be encoded into the 210 * udp header (the ip id could be used but there's no way to 211 * interlock with the kernel's assignment of ip id's and, anyway, 212 * it would have taken a lot more kernel hacking to allow this 213 * code to set the ip id). So, to allow two or more users to 214 * use traceroute simultaneously, we use this task's pid as the 215 * source port (the high bit is set to move the port number out 216 * of the "likely" range). To keep track of which probe is being 217 * replied to (so times and/or hop counts don't get confused by a 218 * reply that was delayed in transit), we increment the destination 219 * port number before each probe. 220 * 221 * Don't use this as a coding example. I was trying to find a 222 * routing problem and this code sort-of popped out after 48 hours 223 * without sleep. I was amazed it ever compiled, much less ran. 224 * 225 * I stole the idea for this program from Steve Deering. Since 226 * the first release, I've learned that had I attended the right 227 * IETF working group meetings, I also could have stolen it from Guy 228 * Almes or Matt Mathis. I don't know (or care) who came up with 229 * the idea first. I envy the originators' perspicacity and I'm 230 * glad they didn't keep the idea a secret. 231 * 232 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 233 * enhancements to the original distribution. 234 * 235 * I've hacked up a round-trip-route version of this that works by 236 * sending a loose-source-routed udp datagram through the destination 237 * back to yourself. Unfortunately, SO many gateways botch source 238 * routing, the thing is almost worthless. Maybe one day... 239 * 240 * -- Van Jacobson (van@helios.ee.lbl.gov) 241 * Tue Dec 20 03:50:13 PST 1988 242 */ 243 244 #include <sys/param.h> 245 #include <sys/time.h> 246 #include <sys/socket.h> 247 #include <sys/uio.h> 248 #include <sys/file.h> 249 #include <sys/ioctl.h> 250 251 #include <netinet/in.h> 252 253 #include <arpa/inet.h> 254 255 #include <netdb.h> 256 #include <stdio.h> 257 #include <err.h> 258 #ifdef HAVE_POLL 259 #include <poll.h> 260 #endif 261 #include <errno.h> 262 #include <stdlib.h> 263 #include <string.h> 264 #include <unistd.h> 265 266 #include <netinet/ip6.h> 267 #include <netinet/icmp6.h> 268 #include <netinet/udp.h> 269 270 #ifdef IPSEC 271 #include <net/route.h> 272 #include <netinet6/ipsec.h> 273 #endif 274 275 #define DUMMY_PORT 10010 276 277 #define MAXPACKET 65535 /* max ip packet size */ 278 #ifndef MAXHOSTNAMELEN 279 #define MAXHOSTNAMELEN 64 280 #endif 281 282 #ifndef FD_SET 283 #define NFDBITS (8*sizeof(fd_set)) 284 #define FD_SETSIZE NFDBITS 285 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) 286 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) 287 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) 288 #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p))) 289 #endif 290 291 #define Fprintf fprintf 292 #define Sprintf sprintf 293 #define Printf printf 294 295 #ifndef HAVE_GETIPNODEBYNAME 296 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 297 #define freehostent(x) 298 #endif 299 300 /* 301 * format of a (udp) probe packet. 302 */ 303 struct opacket { 304 u_char seq; /* sequence number of this packet */ 305 u_char hops; /* hop limit of the packet */ 306 struct timeval tv; /* time packet left */ 307 }; 308 309 u_char packet[512]; /* last inbound (icmp) packet */ 310 struct opacket *outpacket; /* last output (udp) packet */ 311 312 int main(int, char **); 313 int wait_for_reply(int, struct msghdr *); 314 #ifdef IPSEC 315 #ifdef IPSEC_POLICY_IPSEC 316 int setpolicy(int so, char *policy); 317 #endif 318 #endif 319 void send_probe(int, int); 320 struct udphdr *get_udphdr(struct ip6_hdr *, u_char *); 321 int get_hoplim(struct msghdr *); 322 double deltaT(struct timeval *, struct timeval *); 323 char *pr_type(int); 324 int packet_ok(struct msghdr *, int, int); 325 void print(struct msghdr *, int); 326 void tvsub(struct timeval *, struct timeval *); 327 const char *inetname(struct sockaddr *); 328 void usage(void); 329 330 int rcvsock; /* receive (icmp) socket file descriptor */ 331 int sndsock; /* send (udp) socket file descriptor */ 332 struct timezone tz; /* leftover */ 333 334 struct msghdr rcvmhdr; 335 struct iovec rcviov[2]; 336 int rcvhlim; 337 struct in6_pktinfo *rcvpktinfo; 338 339 struct sockaddr_in6 Src, Dst, Rcv; 340 int datalen; /* How much data */ 341 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 342 char rtbuf[2064]; 343 #ifdef USE_RFC2292BIS 344 struct ip6_rthdr *rth; 345 #endif 346 struct cmsghdr *cmsg; 347 348 char *source = 0; 349 char *hostname; 350 351 int nprobes = 3; 352 int first_hop = 1; 353 int max_hops = 30; 354 u_short ident; 355 u_short port = 32768+666; /* start udp dest port # for probe packets */ 356 int options; /* socket options */ 357 int verbose; 358 int waittime = 5; /* time to wait for response (in seconds) */ 359 int nflag; /* print addresses numerically */ 360 int lflag; /* print both numerical address & hostname */ 361 362 #ifdef KAME_SCOPEID 363 const int niflag = NI_WITHSCOPEID; 364 #else 365 const int niflag = 0; 366 #endif 367 368 int 369 main(int argc, char **argv) 370 { 371 struct hostent *hp; 372 int error; 373 struct addrinfo hints, *res; 374 int ch, i, on, probe, seq, hops, rcvcmsglen; 375 static u_char *rcvcmsgbuf; 376 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 377 char *ep; 378 379 /* 380 * Receive ICMP 381 */ 382 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 383 perror("socket(ICMPv6)"); 384 exit(5); 385 } 386 387 /* revoke privs */ 388 seteuid(getuid()); 389 setuid(getuid()); 390 391 /* set a minimum set of socket options */ 392 on = 1; 393 /* specify to tell receiving interface */ 394 #ifdef IPV6_RECVPKTINFO 395 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 396 sizeof(on)) < 0) 397 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 398 #else /* old adv. API */ 399 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 400 sizeof(on)) < 0) 401 err(1, "setsockopt(IPV6_PKTINFO)"); 402 #endif 403 404 /* specify to tell value of hoplimit field of received IP6 hdr */ 405 #ifdef IPV6_RECVHOPLIMIT 406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 407 sizeof(on)) < 0) 408 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 409 #else /* old adv. API */ 410 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 411 sizeof(on)) < 0) 412 err(1, "setsockopt(IPV6_HOPLIMIT)"); 413 #endif 414 415 seq = 0; 416 417 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != -1) 418 switch(ch) { 419 case 'd': 420 options |= SO_DEBUG; 421 break; 422 case 'f': 423 ep = NULL; 424 first_hop = strtoul(optarg, &ep, 0); 425 if (!*argv || *ep) { 426 Fprintf(stderr, 427 "traceroute6: invalid min hoplimit.\n"); 428 exit(1); 429 } 430 if (first_hop > max_hops) { 431 Fprintf(stderr, 432 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 433 exit(1); 434 } 435 break; 436 case 'g': 437 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 438 if (hp == NULL) { 439 Fprintf(stderr, 440 "traceroute6: unknown host %s\n", optarg); 441 exit(1); 442 } 443 #ifdef USE_RFC2292BIS 444 if (rth == NULL) { 445 /* 446 * XXX: We can't detect the number of 447 * intermediate nodes yet. 448 */ 449 if ((rth = inet6_rth_init((void *)rtbuf, 450 sizeof(rtbuf), 451 IPV6_RTHDR_TYPE_0, 452 0)) == NULL) { 453 Fprintf(stderr, 454 "inet6_rth_init failed.\n"); 455 exit(1); 456 } 457 } 458 if (inet6_rth_add((void *)rth, 459 (struct in6_addr *)hp->h_addr)) { 460 Fprintf(stderr, 461 "inet6_rth_add failed for %s\n", 462 optarg); 463 exit(1); 464 } 465 #else /* old advanced API */ 466 if (cmsg == NULL) 467 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 468 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 469 #endif 470 freehostent(hp); 471 break; 472 case 'l': 473 lflag++; 474 break; 475 case 'm': 476 ep = NULL; 477 max_hops = strtoul(optarg, &ep, 0); 478 if (!*argv || *ep) { 479 Fprintf(stderr, 480 "traceroute6: invalid max hoplimit.\n"); 481 exit(1); 482 } 483 if (max_hops < first_hop) { 484 Fprintf(stderr, 485 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 486 exit(1); 487 } 488 break; 489 case 'n': 490 nflag++; 491 break; 492 case 'p': 493 ep = NULL; 494 port = strtoul(optarg, &ep, 0); 495 if (!*argv || *ep) { 496 Fprintf(stderr, 497 "traceroute6: port.\n"); 498 exit(1); 499 } 500 if (port < 1) { 501 Fprintf(stderr, 502 "traceroute6: port must be >0.\n"); 503 exit(1); 504 } 505 break; 506 case 'q': 507 ep = NULL; 508 nprobes = strtoul(optarg, &ep, 0); 509 if (!*argv || *ep) { 510 Fprintf(stderr, 511 "traceroute6: invalid nprobes.\n"); 512 exit(1); 513 } 514 if (nprobes < 1) { 515 Fprintf(stderr, 516 "traceroute6: nprobes must be >0.\n"); 517 exit(1); 518 } 519 break; 520 case 'r': 521 options |= SO_DONTROUTE; 522 break; 523 case 's': 524 /* 525 * set the ip source address of the outbound 526 * probe (e.g., on a multi-homed host). 527 */ 528 source = optarg; 529 break; 530 case 'v': 531 verbose++; 532 break; 533 case 'w': 534 ep = NULL; 535 waittime = strtoul(optarg, &ep, 0); 536 if (!*argv || *ep) { 537 Fprintf(stderr, 538 "traceroute6: invalid wait time.\n"); 539 exit(1); 540 } 541 if (waittime <= 1) { 542 Fprintf(stderr, 543 "traceroute6: wait must be >1 sec.\n"); 544 exit(1); 545 } 546 break; 547 default: 548 usage(); 549 } 550 argc -= optind; 551 argv += optind; 552 553 if (argc < 1 || argc > 2) 554 usage(); 555 556 #if 1 557 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 558 #else 559 setlinebuf (stdout); 560 #endif 561 562 memset(&hints, 0, sizeof(hints)); 563 hints.ai_family = PF_INET6; 564 hints.ai_socktype = SOCK_RAW; 565 hints.ai_protocol = IPPROTO_ICMPV6; 566 hints.ai_flags = AI_CANONNAME; 567 error = getaddrinfo(*argv, NULL, &hints, &res); 568 if (error) { 569 fprintf(stderr, "traceroute6: %s\n", gai_strerror(error)); 570 exit(1); 571 } 572 if (res->ai_addrlen != sizeof(Dst)) { 573 fprintf(stderr, "traceroute6: size of sockaddr mismatch\n"); 574 exit(1); 575 } 576 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 577 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 578 if (!hostname) { 579 fprintf(stderr, "traceroute6: not enough core\n"); 580 exit(1); 581 } 582 583 if (*++argv) { 584 ep = NULL; 585 datalen = strtoul(*argv, &ep, 0); 586 if (!*argv || *ep) { 587 Fprintf(stderr, 588 "traceroute6: invalid packet length.\n"); 589 exit(1); 590 } 591 } 592 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 593 Fprintf(stderr, 594 "traceroute6: packet size must be 0 <= s < %ld.\n", 595 (long)(MAXPACKET - sizeof(struct opacket))); 596 exit(1); 597 } 598 datalen += sizeof(struct opacket); 599 outpacket = (struct opacket *)malloc((unsigned)datalen); 600 if (! outpacket) { 601 perror("malloc"); 602 exit(1); 603 } 604 bzero((char *)outpacket, datalen); 605 606 /* initialize msghdr for receiving packets */ 607 rcviov[0].iov_base = (caddr_t)packet; 608 rcviov[0].iov_len = sizeof(packet); 609 rcvmhdr.msg_name = (caddr_t)&Rcv; 610 rcvmhdr.msg_namelen = sizeof(Rcv); 611 rcvmhdr.msg_iov = rcviov; 612 rcvmhdr.msg_iovlen = 1; 613 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 614 + CMSG_SPACE(sizeof(int)); 615 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 616 Fprintf(stderr, "traceroute6: malloc failed\n"); 617 exit(1); 618 } 619 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 620 rcvmhdr.msg_controllen = rcvcmsglen; 621 622 if (options & SO_DEBUG) 623 setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 624 (char *)&on, sizeof(on)); 625 if (options & SO_DONTROUTE) 626 setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 627 (char *)&on, sizeof(on)); 628 #ifdef IPSEC 629 #ifdef IPSEC_POLICY_IPSEC 630 /* 631 * do not raise error even if setsockopt fails, kernel may have ipsec 632 * turned off. 633 */ 634 if (setpolicy(rcvsock, "in bypass") < 0) 635 errx(1, "%s", ipsec_strerror()); 636 if (setpolicy(rcvsock, "out bypass") < 0) 637 errx(1, "%s", ipsec_strerror()); 638 #else 639 { 640 int level = IPSEC_LEVEL_NONE; 641 642 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 643 sizeof(level)); 644 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 645 sizeof(level)); 646 #ifdef IP_AUTH_TRANS_LEVEL 647 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 648 sizeof(level)); 649 #else 650 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 651 sizeof(level)); 652 #endif 653 #ifdef IP_AUTH_NETWORK_LEVEL 654 setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 655 sizeof(level)); 656 #endif 657 } 658 #endif /*IPSEC_POLICY_IPSEC*/ 659 #endif /*IPSEC*/ 660 661 /* 662 * Send UDP 663 */ 664 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 665 perror("socket(SOCK_DGRAM)"); 666 exit(5); 667 } 668 #ifdef SO_SNDBUF 669 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 670 sizeof(datalen)) < 0) { 671 perror("setsockopt(SO_SNDBUF)"); 672 exit(6); 673 } 674 #endif /* SO_SNDBUF */ 675 if (options & SO_DEBUG) 676 setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 677 (char *)&on, sizeof(on)); 678 if (options & SO_DONTROUTE) 679 setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 680 (char *)&on, sizeof(on)); 681 #ifdef USE_RFC2292BIS 682 if (rth) {/* XXX: there is no library to finalize the header... */ 683 rth->ip6r_len = rth->ip6r_segleft * 2; 684 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 685 (void *)rth, (rth->ip6r_len + 1) << 3)) { 686 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 687 strerror(errno)); 688 exit(1); 689 } 690 } 691 #else /* old advanced API */ 692 if (cmsg != NULL) { 693 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 694 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 695 rtbuf, cmsg->cmsg_len) < 0) { 696 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 697 strerror(errno)); 698 exit(1); 699 } 700 } 701 #endif /* USE_RFC2292BIS */ 702 #ifdef IPSEC 703 #ifdef IPSEC_POLICY_IPSEC 704 /* 705 * do not raise error even if setsockopt fails, kernel may have ipsec 706 * turned off. 707 */ 708 if (setpolicy(sndsock, "in bypass") < 0) 709 errx(1, "%s", ipsec_strerror()); 710 if (setpolicy(sndsock, "out bypass") < 0) 711 errx(1, "%s", ipsec_strerror()); 712 #else 713 { 714 int level = IPSEC_LEVEL_BYPASS; 715 716 setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 717 sizeof(level)); 718 setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 719 sizeof(level)); 720 #ifdef IP_AUTH_TRANS_LEVEL 721 setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 722 sizeof(level)); 723 #else 724 setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 725 sizeof(level)); 726 #endif 727 #ifdef IP_AUTH_NETWORK_LEVEL 728 setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 729 sizeof(level)); 730 #endif 731 } 732 #endif /*IPSEC_POLICY_IPSEC*/ 733 #endif /*IPSEC*/ 734 735 /* 736 * Source selection 737 */ 738 bzero(&Src, sizeof(Src)); 739 if (source) { 740 struct addrinfo hints, *res; 741 int error; 742 743 memset(&hints, 0, sizeof(hints)); 744 hints.ai_family = AF_INET6; 745 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 746 hints.ai_flags = AI_NUMERICHOST; 747 error = getaddrinfo(source, "0", &hints, &res); 748 if (error) { 749 Printf("traceroute6: %s: %s\n", source, 750 gai_strerror(error)); 751 exit(1); 752 } 753 if (res->ai_addrlen > sizeof(Src)) { 754 Printf("traceroute6: %s: %s\n", source, 755 gai_strerror(error)); 756 exit(1); 757 } 758 memcpy(&Src, res->ai_addr, res->ai_addrlen); 759 freeaddrinfo(res); 760 } else { 761 struct sockaddr_in6 Nxt; 762 int dummy, len; 763 764 Nxt = Dst; 765 Nxt.sin6_port = htons(DUMMY_PORT); 766 if (cmsg != NULL) 767 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 768 sizeof(Nxt.sin6_addr)); 769 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 770 perror("socket"); 771 exit(1); 772 } 773 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 774 perror("connect"); 775 exit(1); 776 } 777 len = sizeof(Src); 778 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 779 perror("getsockname"); 780 exit(1); 781 } 782 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 783 src0, sizeof(src0), NULL, 0, 784 NI_NUMERICHOST | niflag)) { 785 Fprintf(stderr, "getnameinfo failed for source\n"); 786 exit(1); 787 } 788 source = src0; 789 close(dummy); 790 } 791 792 #if 1 793 ident = (getpid() & 0xffff) | 0x8000; 794 #else 795 ident = 0; /*let the kernel pick one*/ 796 #endif 797 Src.sin6_port = htons(ident); 798 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 799 perror("bind"); 800 exit(1); 801 } 802 803 if (ident == 0) { 804 int len; 805 806 len = sizeof(Src); 807 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 808 perror("getsockname"); 809 exit(1); 810 } 811 ident = ntohs(Src.sin6_port); 812 } 813 814 /* 815 * Message to users 816 */ 817 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 818 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag)) 819 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 820 Fprintf(stderr, "traceroute6"); 821 Fprintf(stderr, " to %s (%s)", hostname, hbuf); 822 if (source) 823 Fprintf(stderr, " from %s", source); 824 Fprintf(stderr, 825 ", %d hops max, %d byte packets\n", 826 max_hops, datalen); 827 fflush(stderr); 828 829 if (first_hop > 1) 830 Printf("Skipping %d intermediate hops\n", first_hop - 1); 831 832 /* 833 * Main loop 834 */ 835 for (hops = first_hop; hops <= max_hops; ++hops) { 836 struct in6_addr lastaddr; 837 int got_there = 0; 838 int unreachable = 0; 839 int gotlastaddr = 0; 840 841 Printf("%2d ", hops); 842 bzero(&lastaddr, sizeof(lastaddr)); 843 for (probe = 0; probe < nprobes; ++probe) { 844 int cc; 845 struct timeval t1, t2; 846 struct timezone tz; 847 848 gettimeofday(&t1, &tz); 849 send_probe(++seq, hops); 850 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 851 gettimeofday(&t2, &tz); 852 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 853 if (!gotlastaddr || 854 !IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 855 &lastaddr)) { 856 if (gotlastaddr) 857 printf("\n "); 858 print(&rcvmhdr, cc); 859 lastaddr = Rcv.sin6_addr; 860 ++gotlastaddr; 861 } 862 Printf(" %g ms", deltaT(&t1, &t2)); 863 switch(i - 1) { 864 case ICMP6_DST_UNREACH_NOROUTE: 865 ++unreachable; 866 Printf(" !N"); 867 break; 868 case ICMP6_DST_UNREACH_ADMIN: 869 ++unreachable; 870 Printf(" !P"); 871 break; 872 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 873 ++unreachable; 874 Printf(" !S"); 875 break; 876 case ICMP6_DST_UNREACH_ADDR: 877 ++unreachable; 878 Printf(" !A"); 879 break; 880 case ICMP6_DST_UNREACH_NOPORT: 881 if (rcvhlim >= 0 && 882 rcvhlim <= 1) 883 Printf(" !"); 884 ++got_there; 885 break; 886 } 887 break; 888 } 889 } 890 if (cc == 0) 891 Printf(" *"); 892 fflush(stdout); 893 } 894 putchar('\n'); 895 if (got_there || 896 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 897 exit(0); 898 } 899 } 900 901 exit(0); 902 } 903 904 int 905 wait_for_reply(int sock, struct msghdr *mhdr) 906 { 907 #ifdef HAVE_POLL 908 struct pollfd pfd[1]; 909 int cc = 0; 910 911 pfd[0].fd = sock; 912 pfd[0].events = POLLIN; 913 pfd[0].revents = 0; 914 915 if (poll(pfd, 1, waittime * 1000) > 0) 916 cc = recvmsg(rcvsock, mhdr, 0); 917 918 return(cc); 919 #else 920 fd_set *fdsp; 921 struct timeval wait; 922 int cc = 0, fdsn; 923 924 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 925 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 926 err(1, "malloc"); 927 memset(fdsp, 0, fdsn); 928 FD_SET(sock, fdsp); 929 wait.tv_sec = waittime; wait.tv_usec = 0; 930 931 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 932 cc = recvmsg(rcvsock, mhdr, 0); 933 934 free(fdsp); 935 return(cc); 936 #endif 937 } 938 939 #ifdef IPSEC 940 #ifdef IPSEC_POLICY_IPSEC 941 int 942 setpolicy(int so, char *policy) 943 { 944 char *buf; 945 946 buf = ipsec_set_policy(policy, strlen(policy)); 947 if (buf == NULL) { 948 warnx("%s", ipsec_strerror()); 949 return -1; 950 } 951 setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 952 buf, ipsec_get_policylen(buf)); 953 954 free(buf); 955 956 return 0; 957 } 958 #endif 959 #endif 960 961 void 962 send_probe(int seq, int hops) 963 { 964 struct opacket *op = outpacket; 965 int i; 966 967 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 968 (char *)&hops, sizeof(hops)) < 0) { 969 perror("setsockopt IPV6_UNICAST_HOPS"); 970 } 971 972 Dst.sin6_port = htons(port + seq); 973 974 op->seq = seq; 975 op->hops = hops; 976 gettimeofday(&op->tv, &tz); 977 978 i = sendto(sndsock, (char *)outpacket, datalen , 0, 979 (struct sockaddr *)&Dst, Dst.sin6_len); 980 if (i < 0 || i != datalen) { 981 if (i<0) 982 perror("sendto"); 983 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 984 datalen, i); 985 fflush(stdout); 986 } 987 } 988 989 int 990 get_hoplim(struct msghdr *mhdr) 991 { 992 struct cmsghdr *cm; 993 994 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 995 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 996 if (cm->cmsg_level == IPPROTO_IPV6 && 997 cm->cmsg_type == IPV6_HOPLIMIT && 998 cm->cmsg_len == CMSG_LEN(sizeof(int))) 999 return(*(int *)CMSG_DATA(cm)); 1000 } 1001 1002 return(-1); 1003 } 1004 1005 double 1006 deltaT(struct timeval *t1p, struct timeval *t2p) 1007 { 1008 double dt; 1009 1010 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 1011 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 1012 return (dt); 1013 } 1014 1015 1016 /* 1017 * Convert an ICMP "type" field to a printable string. 1018 */ 1019 char * 1020 pr_type(int t0) 1021 { 1022 u_char t = t0 & 0xff; 1023 char *cp; 1024 1025 switch (t) { 1026 case ICMP6_DST_UNREACH: 1027 cp = "Destination Unreachable"; 1028 break; 1029 case ICMP6_PACKET_TOO_BIG: 1030 cp = "Pakcet Too Big"; 1031 break; 1032 case ICMP6_TIME_EXCEEDED: 1033 cp = "Time Exceeded"; 1034 break; 1035 case ICMP6_PARAM_PROB: 1036 cp = "Parameter Problem"; 1037 break; 1038 case ICMP6_ECHO_REQUEST: 1039 cp = "Echo Request"; 1040 break; 1041 case ICMP6_ECHO_REPLY: 1042 cp = "Echo Reply"; 1043 break; 1044 case ICMP6_MEMBERSHIP_QUERY: 1045 cp = "Group Membership Query"; 1046 break; 1047 case ICMP6_MEMBERSHIP_REPORT: 1048 cp = "Group Membership Report"; 1049 break; 1050 case ICMP6_MEMBERSHIP_REDUCTION: 1051 cp = "Group Membership Reduction"; 1052 break; 1053 case ND_ROUTER_SOLICIT: 1054 cp = "Router Solicitation"; 1055 break; 1056 case ND_ROUTER_ADVERT: 1057 cp = "Router Advertisement"; 1058 break; 1059 case ND_NEIGHBOR_SOLICIT: 1060 cp = "Neighbor Solicitation"; 1061 break; 1062 case ND_NEIGHBOR_ADVERT: 1063 cp = "Neighbor Advertisement"; 1064 break; 1065 case ND_REDIRECT: 1066 cp = "Redirect"; 1067 break; 1068 default: 1069 cp = "Unknown"; 1070 break; 1071 } 1072 return cp; 1073 } 1074 1075 1076 int 1077 packet_ok(struct msghdr *mhdr, int cc, int seq) 1078 { 1079 struct icmp6_hdr *icp; 1080 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1081 u_char type, code; 1082 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1083 struct cmsghdr *cm; 1084 int *hlimp; 1085 char hbuf[NI_MAXHOST]; 1086 1087 #ifdef OLDRAWSOCKET 1088 int hlen; 1089 struct ip6_hdr *ip; 1090 #endif 1091 1092 #ifdef OLDRAWSOCKET 1093 ip = (struct ip6_hdr *) buf; 1094 hlen = sizeof(struct ip6_hdr); 1095 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1096 if (verbose) { 1097 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1098 hbuf, sizeof(hbuf), NULL, 0, 1099 NI_NUMERICHOST | niflag) != 0) 1100 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1101 Printf("packet too short (%d bytes) from %s\n", cc, 1102 hbuf); 1103 } 1104 return (0); 1105 } 1106 cc -= hlen; 1107 icp = (struct icmp6_hdr *)(buf + hlen); 1108 #else 1109 if (cc < sizeof(struct icmp6_hdr)) { 1110 if (verbose) { 1111 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1112 hbuf, sizeof(hbuf), NULL, 0, 1113 NI_NUMERICHOST | niflag) != 0) 1114 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1115 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1116 } 1117 return(0); 1118 } 1119 icp = (struct icmp6_hdr *)buf; 1120 #endif 1121 /* get optional information via advanced API */ 1122 rcvpktinfo = NULL; 1123 hlimp = NULL; 1124 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1125 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1126 if (cm->cmsg_level == IPPROTO_IPV6 && 1127 cm->cmsg_type == IPV6_PKTINFO && 1128 cm->cmsg_len == 1129 CMSG_LEN(sizeof(struct in6_pktinfo))) 1130 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1131 1132 if (cm->cmsg_level == IPPROTO_IPV6 && 1133 cm->cmsg_type == IPV6_HOPLIMIT && 1134 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1135 hlimp = (int *)CMSG_DATA(cm); 1136 } 1137 if (rcvpktinfo == NULL || hlimp == NULL) { 1138 warnx("failed to get received hop limit or packet info"); 1139 #if 0 1140 return(0); 1141 #else 1142 rcvhlim = 0; /*XXX*/ 1143 #endif 1144 } 1145 else 1146 rcvhlim = *hlimp; 1147 1148 type = icp->icmp6_type; 1149 code = icp->icmp6_code; 1150 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1151 || type == ICMP6_DST_UNREACH) { 1152 struct ip6_hdr *hip; 1153 struct udphdr *up; 1154 1155 hip = (struct ip6_hdr *)(icp + 1); 1156 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1157 if (verbose) 1158 warnx("failed to get upper layer header"); 1159 return(0); 1160 } 1161 if (up->uh_sport == htons(ident) && 1162 up->uh_dport == htons(port+seq)) 1163 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1164 } 1165 if (verbose) { 1166 int i; 1167 u_int8_t *p; 1168 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1169 1170 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1171 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1172 strlcpy(sbuf, "invalid", sizeof(hbuf)); 1173 Printf("\n%d bytes from %s to %s", cc, sbuf, 1174 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1175 dbuf, sizeof(dbuf)) 1176 : "?"); 1177 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1178 icp->icmp6_code); 1179 p = (u_int8_t *)(icp + 1); 1180 #define WIDTH 16 1181 for (i = 0; i < cc; i++) { 1182 if (i % WIDTH == 0) 1183 Printf("%04x:", i); 1184 if (i % 4 == 0) 1185 Printf(" "); 1186 Printf("%02x", p[i]); 1187 if (i % WIDTH == WIDTH - 1) 1188 Printf("\n"); 1189 } 1190 if (cc % WIDTH != 0) 1191 Printf("\n"); 1192 } 1193 return(0); 1194 } 1195 1196 /* 1197 * Increment pointer until find the UDP header. 1198 */ 1199 struct udphdr * 1200 get_udphdr(struct ip6_hdr *ip6, u_char *lim) 1201 { 1202 u_char *cp = (u_char *)ip6, nh; 1203 int hlen; 1204 1205 if (cp + sizeof(*ip6) >= lim) 1206 return(NULL); 1207 1208 nh = ip6->ip6_nxt; 1209 cp += sizeof(struct ip6_hdr); 1210 1211 while(lim - cp >= 8) { 1212 switch(nh) { 1213 case IPPROTO_ESP: 1214 case IPPROTO_TCP: 1215 case IPPROTO_ICMPV6: 1216 return(NULL); 1217 case IPPROTO_UDP: 1218 return((struct udphdr *)cp); 1219 case IPPROTO_FRAGMENT: 1220 hlen = sizeof(struct ip6_frag); 1221 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1222 break; 1223 case IPPROTO_AH: 1224 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1225 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1226 break; 1227 default: 1228 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1229 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1230 break; 1231 } 1232 1233 cp += hlen; 1234 } 1235 1236 return(NULL); 1237 } 1238 1239 void 1240 print(struct msghdr *mhdr, int cc) 1241 { 1242 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1243 char hbuf[NI_MAXHOST]; 1244 1245 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1246 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1247 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1248 if (nflag) 1249 Printf(" %s", hbuf); 1250 else if (lflag) 1251 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1252 else 1253 Printf(" %s", inetname((struct sockaddr *)from)); 1254 1255 if (verbose) { 1256 #ifdef OLDRAWSOCKET 1257 Printf(" %d bytes to %s", cc, 1258 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1259 hbuf, sizeof(hbuf)) 1260 : "?"); 1261 #else 1262 Printf(" %d bytes of data to %s", cc, 1263 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1264 hbuf, sizeof(hbuf)) 1265 : "?"); 1266 #endif 1267 } 1268 } 1269 1270 /* 1271 * Subtract 2 timeval structs: out = out - in. 1272 * Out is assumed to be >= in. 1273 */ 1274 void 1275 tvsub(struct timeval *out, struct timeval *in) 1276 { 1277 if ((out->tv_usec -= in->tv_usec) < 0) { 1278 out->tv_sec--; 1279 out->tv_usec += 1000000; 1280 } 1281 out->tv_sec -= in->tv_sec; 1282 } 1283 1284 1285 /* 1286 * Construct an Internet address representation. 1287 * If the nflag has been supplied, give 1288 * numeric value, otherwise try for symbolic name. 1289 */ 1290 const char * 1291 inetname(struct sockaddr *sa) 1292 { 1293 char *cp; 1294 static char line[NI_MAXHOST]; 1295 static char domain[MAXHOSTNAMELEN + 1]; 1296 static int first = 1; 1297 1298 if (first && !nflag) { 1299 first = 0; 1300 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1301 (cp = strchr(domain, '.'))) 1302 strlcpy(domain, cp + 1, sizeof(domain)); 1303 else 1304 domain[0] = 0; 1305 } 1306 cp = NULL; 1307 if (!nflag) { 1308 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1309 NI_NAMEREQD) == 0) { 1310 if ((cp = strchr(line, '.')) && 1311 !strcmp(cp + 1, domain)) 1312 *cp = 0; 1313 cp = line; 1314 } 1315 } 1316 if (cp) 1317 return cp; 1318 1319 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1320 NI_NUMERICHOST | niflag) != 0) 1321 strlcpy(line, "invalid", sizeof(line)); 1322 return line; 1323 } 1324 1325 void 1326 usage(void) 1327 { 1328 fprintf(stderr, 1329 "usage: traceroute6 [-dlnrv] [-f firsthop] [-g gateway] [-m hoplimit] [-p port]\n" 1330 " [-q probes] [-s src] [-w waittime] target [datalen]\n"); 1331 exit(1); 1332 } 1333