traceroute6.c revision 1.12
1 /* $NetBSD: traceroute6.c,v 1.12 2000/06/30 18:58:42 itojun Exp $ */ 2 /* $KAME: traceroute6.c,v 1.30 2000/06/30 18:56:01 itojun Exp $ */ 3 4 /* 5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 6 * All rights reserved. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. Neither the name of the project nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /*- 34 * Copyright (c) 1990, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * This code is derived from software contributed to Berkeley by 38 * Van Jacobson. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 */ 68 69 #if 0 70 #ifndef lint 71 static char copyright[] = 72 "@(#) Copyright (c) 1990, 1993\n\ 73 The Regents of the University of California. All rights reserved.\n"; 74 #endif /* not lint */ 75 76 #ifndef lint 77 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 78 #endif /* not lint */ 79 #else 80 #include <sys/cdefs.h> 81 #ifndef lint 82 __RCSID("$NetBSD: traceroute6.c,v 1.12 2000/06/30 18:58:42 itojun Exp $"); 83 #endif 84 #endif 85 86 /* 87 * traceroute host - trace the route ip packets follow going to "host". 88 * 89 * Attempt to trace the route an ip packet would follow to some 90 * internet host. We find out intermediate hops by launching probe 91 * packets with a small ttl (time to live) then listening for an 92 * icmp "time exceeded" reply from a gateway. We start our probes 93 * with a ttl of one and increase by one until we get an icmp "port 94 * unreachable" (which means we got to "host") or hit a max (which 95 * defaults to 30 hops & can be changed with the -m flag). Three 96 * probes (change with -q flag) are sent at each ttl setting and a 97 * line is printed showing the ttl, address of the gateway and 98 * round trip time of each probe. If the probe answers come from 99 * different gateways, the address of each responding system will 100 * be printed. If there is no response within a 5 sec. timeout 101 * interval (changed with the -w flag), a "*" is printed for that 102 * probe. 103 * 104 * Probe packets are UDP format. We don't want the destination 105 * host to process them so the destination port is set to an 106 * unlikely value (if some clod on the destination is using that 107 * value, it can be changed with the -p flag). 108 * 109 * A sample use might be: 110 * 111 * [yak 71]% traceroute nis.nsf.net. 112 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 113 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 114 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 115 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 116 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 117 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 118 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 119 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 120 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 121 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 122 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 123 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 124 * 125 * Note that lines 2 & 3 are the same. This is due to a buggy 126 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 127 * packets with a zero ttl. 128 * 129 * A more interesting example is: 130 * 131 * [yak 72]% traceroute allspice.lcs.mit.edu. 132 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 133 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 134 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 135 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 136 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 137 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 138 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 139 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 140 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 141 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 142 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 143 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 144 * 12 * * * 145 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 146 * 14 * * * 147 * 15 * * * 148 * 16 * * * 149 * 17 * * * 150 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 151 * 152 * (I start to see why I'm having so much trouble with mail to 153 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 154 * either don't send ICMP "time exceeded" messages or send them 155 * with a ttl too small to reach us. 14 - 17 are running the 156 * MIT C Gateway code that doesn't send "time exceeded"s. God 157 * only knows what's going on with 12. 158 * 159 * The silent gateway 12 in the above may be the result of a bug in 160 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 161 * sends an unreachable message using whatever ttl remains in the 162 * original datagram. Since, for gateways, the remaining ttl is 163 * zero, the icmp "time exceeded" is guaranteed to not make it back 164 * to us. The behavior of this bug is slightly more interesting 165 * when it appears on the destination system: 166 * 167 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 168 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 169 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 170 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 171 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 172 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 173 * 7 * * * 174 * 8 * * * 175 * 9 * * * 176 * 10 * * * 177 * 11 * * * 178 * 12 * * * 179 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 180 * 181 * Notice that there are 12 "gateways" (13 is the final 182 * destination) and exactly the last half of them are "missing". 183 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 184 * is using the ttl from our arriving datagram as the ttl in its 185 * icmp reply. So, the reply will time out on the return path 186 * (with no notice sent to anyone since icmp's aren't sent for 187 * icmp's) until we probe with a ttl that's at least twice the path 188 * length. I.e., rip is really only 7 hops away. A reply that 189 * returns with a ttl of 1 is a clue this problem exists. 190 * Traceroute prints a "!" after the time if the ttl is <= 1. 191 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 192 * non-standard (HPUX) software, expect to see this problem 193 * frequently and/or take care picking the target host of your 194 * probes. 195 * 196 * Other possible annotations after the time are !H, !N, !P (got a host, 197 * network or protocol unreachable, respectively), !S or !F (source 198 * route failed or fragmentation needed -- neither of these should 199 * ever occur and the associated gateway is busted if you see one). If 200 * almost all the probes result in some kind of unreachable, traceroute 201 * will give up and exit. 202 * 203 * Notes 204 * ----- 205 * This program must be run by root or be setuid. (I suggest that 206 * you *don't* make it setuid -- casual use could result in a lot 207 * of unnecessary traffic on our poor, congested nets.) 208 * 209 * This program requires a kernel mod that does not appear in any 210 * system available from Berkeley: A raw ip socket using proto 211 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 212 * opposed to data to be wrapped in a ip datagram). See the README 213 * file that came with the source to this program for a description 214 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 215 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 216 * MODIFIED TO RUN THIS PROGRAM. 217 * 218 * The udp port usage may appear bizarre (well, ok, it is bizarre). 219 * The problem is that an icmp message only contains 8 bytes of 220 * data from the original datagram. 8 bytes is the size of a udp 221 * header so, if we want to associate replies with the original 222 * datagram, the necessary information must be encoded into the 223 * udp header (the ip id could be used but there's no way to 224 * interlock with the kernel's assignment of ip id's and, anyway, 225 * it would have taken a lot more kernel hacking to allow this 226 * code to set the ip id). So, to allow two or more users to 227 * use traceroute simultaneously, we use this task's pid as the 228 * source port (the high bit is set to move the port number out 229 * of the "likely" range). To keep track of which probe is being 230 * replied to (so times and/or hop counts don't get confused by a 231 * reply that was delayed in transit), we increment the destination 232 * port number before each probe. 233 * 234 * Don't use this as a coding example. I was trying to find a 235 * routing problem and this code sort-of popped out after 48 hours 236 * without sleep. I was amazed it ever compiled, much less ran. 237 * 238 * I stole the idea for this program from Steve Deering. Since 239 * the first release, I've learned that had I attended the right 240 * IETF working group meetings, I also could have stolen it from Guy 241 * Almes or Matt Mathis. I don't know (or care) who came up with 242 * the idea first. I envy the originators' perspicacity and I'm 243 * glad they didn't keep the idea a secret. 244 * 245 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 246 * enhancements to the original distribution. 247 * 248 * I've hacked up a round-trip-route version of this that works by 249 * sending a loose-source-routed udp datagram through the destination 250 * back to yourself. Unfortunately, SO many gateways botch source 251 * routing, the thing is almost worthless. Maybe one day... 252 * 253 * -- Van Jacobson (van (at) helios.ee.lbl.gov) 254 * Tue Dec 20 03:50:13 PST 1988 255 */ 256 257 #include <sys/param.h> 258 #include <sys/time.h> 259 #include <sys/socket.h> 260 #include <sys/uio.h> 261 #include <sys/file.h> 262 #include <sys/ioctl.h> 263 264 #include <netinet/in.h> 265 266 #include <arpa/inet.h> 267 268 #include <netdb.h> 269 #include <stdio.h> 270 #include <err.h> 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 <netinet6/ipsec.h> 283 #endif 284 285 #define DUMMY_PORT 10010 286 287 #define MAXPACKET 65535 /* max ip packet size */ 288 #ifndef MAXHOSTNAMELEN 289 #define MAXHOSTNAMELEN 64 290 #endif 291 292 #ifndef FD_SET 293 #define NFDBITS (8*sizeof(fd_set)) 294 #define FD_SETSIZE NFDBITS 295 #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) 296 #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) 297 #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) 298 #define FD_ZERO(p) bzero((char *)(p), sizeof(*(p))) 299 #endif 300 301 #define Fprintf (void)fprintf 302 #define Sprintf (void)sprintf 303 #define Printf (void)printf 304 305 #ifndef HAVE_GETIPNODEBYNAME 306 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 307 #define freehostent(x) 308 #endif 309 310 /* 311 * format of a (udp) probe packet. 312 */ 313 struct opacket { 314 u_char seq; /* sequence number of this packet */ 315 u_char hops; /* hop limit of the packet */ 316 struct timeval tv; /* time packet left */ 317 }; 318 319 u_char packet[512]; /* last inbound (icmp) packet */ 320 struct opacket *outpacket; /* last output (udp) packet */ 321 322 int main __P((int, char *[])); 323 int wait_for_reply __P((int, struct msghdr *)); 324 #ifdef IPSEC 325 #ifdef IPSEC_POLICY_IPSEC 326 int setpolicy __P((int so, char *policy)); 327 #endif 328 #endif 329 void send_probe __P((int, int)); 330 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 331 int get_hoplim __P((struct msghdr *)); 332 double deltaT __P((struct timeval *, struct timeval *)); 333 char *pr_type __P((int)); 334 int packet_ok __P((struct msghdr *, int, int)); 335 void print __P((struct msghdr *, int)); 336 void tvsub __P((struct timeval *, struct timeval *)); 337 const char *inetname __P((struct sockaddr *)); 338 void usage __P((void)); 339 340 int rcvsock; /* receive (icmp) socket file descriptor */ 341 int sndsock; /* send (udp) socket file descriptor */ 342 struct timezone tz; /* leftover */ 343 344 struct msghdr rcvmhdr; 345 struct iovec rcviov[2]; 346 int rcvhlim; 347 struct in6_pktinfo *rcvpktinfo; 348 349 struct sockaddr_in6 Src, Dst, Rcv; 350 int datalen; /* How much data */ 351 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 352 char rtbuf[2064]; 353 #ifdef USE_RFC2292BIS 354 struct ip6_rthdr *rth; 355 #endif 356 struct cmsghdr *cmsg; 357 358 char *source = 0; 359 char *hostname; 360 361 int nprobes = 3; 362 int first_hop = 1; 363 int max_hops = 30; 364 u_short ident; 365 u_short port = 32768+666; /* start udp dest port # for probe packets */ 366 int options; /* socket options */ 367 int verbose; 368 int waittime = 5; /* time to wait for response (in seconds) */ 369 int nflag; /* print addresses numerically */ 370 int lflag; /* print both numerical address & hostname */ 371 372 #ifdef KAME_SCOPEID 373 const int niflag = NI_WITHSCOPEID; 374 #else 375 const int niflag = 0; 376 #endif 377 378 int 379 main(argc, argv) 380 int argc; 381 char *argv[]; 382 { 383 struct hostent *hp; 384 int error; 385 struct addrinfo hints, *res; 386 int ch, i, on, probe, seq, hops, rcvcmsglen; 387 static u_char *rcvcmsgbuf; 388 char hbuf[NI_MAXHOST], src0[NI_MAXHOST]; 389 390 /* 391 * Receive ICMP 392 */ 393 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 394 perror("socket(ICMPv6)"); 395 exit(5); 396 } 397 398 /* set a minimum set of socket options */ 399 on = 1; 400 /* specify to tell receiving interface */ 401 #ifdef IPV6_RECVPKTINFO 402 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 403 sizeof(on)) < 0) 404 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 405 #else /* old adv. API */ 406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 407 sizeof(on)) < 0) 408 err(1, "setsockopt(IPV6_PKTINFO)"); 409 #endif 410 411 /* specify to tell value of hoplimit field of received IP6 hdr */ 412 #ifdef IPV6_RECVHOPLIMIT 413 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 414 sizeof(on)) < 0) 415 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 416 #else /* old adv. API */ 417 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 418 sizeof(on)) < 0) 419 err(1, "setsockopt(IPV6_HOPLIMIT)"); 420 #endif 421 422 /* revoke privs */ 423 seteuid(getuid()); 424 setuid(getuid()); 425 426 seq = 0; 427 428 while ((ch = getopt(argc, argv, "df:g:lm:np:q:rs:w:v")) != EOF) 429 switch(ch) { 430 case 'd': 431 options |= SO_DEBUG; 432 break; 433 case 'f': 434 first_hop = atoi(optarg); 435 if (first_hop > max_hops) { 436 Fprintf(stderr, 437 "traceroute6: min hoplimit must be <= %d.\n", max_hops); 438 exit(1); 439 } 440 break; 441 case 'g': 442 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 443 if (hp == NULL) { 444 Fprintf(stderr, 445 "traceroute6: unknown host %s\n", optarg); 446 exit(1); 447 } 448 #ifdef USE_RFC2292BIS 449 if (rth == NULL) { 450 /* 451 * XXX: We can't detect the number of 452 * intermediate nodes yet. 453 */ 454 if ((rth = inet6_rth_init((void *)rtbuf, 455 sizeof(rtbuf), 456 IPV6_RTHDR_TYPE_0, 457 0)) == NULL) { 458 Fprintf(stderr, 459 "inet6_rth_init failed.\n"); 460 exit(1); 461 } 462 } 463 if (inet6_rth_add((void *)rth, 464 (struct in6_addr *)hp->h_addr)) { 465 Fprintf(stderr, 466 "inet6_rth_add failed for %s\n", 467 optarg); 468 exit(1); 469 } 470 #else /* old advanced API */ 471 if (cmsg == NULL) 472 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 473 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 474 #endif 475 freehostent(hp); 476 break; 477 case 'l': 478 lflag++; 479 break; 480 case 'm': 481 max_hops = atoi(optarg); 482 if (max_hops < first_hop) { 483 Fprintf(stderr, 484 "traceroute6: max hoplimit must be >= %d.\n", first_hop); 485 exit(1); 486 } 487 break; 488 case 'n': 489 nflag++; 490 break; 491 case 'p': 492 port = atoi(optarg); 493 if (port < 1) { 494 Fprintf(stderr, 495 "traceroute6: port must be >0.\n"); 496 exit(1); 497 } 498 break; 499 case 'q': 500 nprobes = atoi(optarg); 501 if (nprobes < 1) { 502 Fprintf(stderr, 503 "traceroute6: nprobes must be >0.\n"); 504 exit(1); 505 } 506 break; 507 case 'r': 508 options |= SO_DONTROUTE; 509 break; 510 case 's': 511 /* 512 * set the ip source address of the outbound 513 * probe (e.g., on a multi-homed host). 514 */ 515 source = optarg; 516 break; 517 case 'v': 518 verbose++; 519 break; 520 case 'w': 521 waittime = atoi(optarg); 522 if (waittime <= 1) { 523 Fprintf(stderr, 524 "traceroute6: wait must be >1 sec.\n"); 525 exit(1); 526 } 527 break; 528 default: 529 usage(); 530 } 531 argc -= optind; 532 argv += optind; 533 534 if (argc < 1) 535 usage(); 536 537 #if 1 538 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 539 #else 540 setlinebuf (stdout); 541 #endif 542 543 memset(&hints, 0, sizeof(hints)); 544 hints.ai_family = PF_INET6; 545 hints.ai_socktype = SOCK_RAW; 546 hints.ai_protocol = IPPROTO_ICMPV6; 547 hints.ai_flags = AI_CANONNAME; 548 error = getaddrinfo(*argv, NULL, &hints, &res); 549 if (error) { 550 (void)fprintf(stderr, 551 "traceroute6: %s\n", gai_strerror(error)); 552 exit(1); 553 } 554 if (res->ai_addrlen != sizeof(Dst)) { 555 (void)fprintf(stderr, 556 "traceroute6: size of sockaddr mismatch\n"); 557 exit(1); 558 } 559 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 560 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 561 562 if (*++argv) 563 datalen = atoi(*argv); 564 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 565 Fprintf(stderr, 566 "traceroute6: packet size must be 0 <= s < %ld.\n", 567 (long)(MAXPACKET - sizeof(struct opacket))); 568 exit(1); 569 } 570 datalen += sizeof(struct opacket); 571 outpacket = (struct opacket *)malloc((unsigned)datalen); 572 if (! outpacket) { 573 perror("malloc"); 574 exit(1); 575 } 576 (void) bzero((char *)outpacket, datalen); 577 578 /* initialize msghdr for receiving packets */ 579 rcviov[0].iov_base = (caddr_t)packet; 580 rcviov[0].iov_len = sizeof(packet); 581 rcvmhdr.msg_name = (caddr_t)&Rcv; 582 rcvmhdr.msg_namelen = sizeof(Rcv); 583 rcvmhdr.msg_iov = rcviov; 584 rcvmhdr.msg_iovlen = 1; 585 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) 586 + CMSG_SPACE(sizeof(int)); 587 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) { 588 Fprintf(stderr, "traceroute6: malloc failed\n"); 589 exit(1); 590 } 591 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 592 rcvmhdr.msg_controllen = rcvcmsglen; 593 594 if (options & SO_DEBUG) 595 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 596 (char *)&on, sizeof(on)); 597 if (options & SO_DONTROUTE) 598 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 599 (char *)&on, sizeof(on)); 600 #ifdef IPSEC 601 #ifdef IPSEC_POLICY_IPSEC 602 /* 603 * do not raise error even if setsockopt fails, kernel may have ipsec 604 * turned off. 605 */ 606 if (setpolicy(rcvsock, "in bypass") < 0) 607 errx(1, ipsec_strerror()); 608 if (setpolicy(rcvsock, "out bypass") < 0) 609 errx(1, ipsec_strerror()); 610 #else 611 { 612 int level = IPSEC_LEVEL_NONE; 613 614 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 615 sizeof(level)); 616 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 617 sizeof(level)); 618 #ifdef IP_AUTH_TRANS_LEVEL 619 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 620 sizeof(level)); 621 #else 622 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 623 sizeof(level)); 624 #endif 625 #ifdef IP_AUTH_NETWORK_LEVEL 626 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 627 sizeof(level)); 628 #endif 629 } 630 #endif /*IPSEC_POLICY_IPSEC*/ 631 #endif /*IPSEC*/ 632 633 /* 634 * Send UDP 635 */ 636 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 637 perror("socket(SOCK_DGRAM)"); 638 exit(5); 639 } 640 #ifdef SO_SNDBUF 641 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 642 sizeof(datalen)) < 0) { 643 perror("setsockopt(SO_SNDBUF)"); 644 exit(6); 645 } 646 #endif /* SO_SNDBUF */ 647 if (options & SO_DEBUG) 648 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 649 (char *)&on, sizeof(on)); 650 if (options & SO_DONTROUTE) 651 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 652 (char *)&on, sizeof(on)); 653 #ifdef USE_RFC2292BIS 654 if (rth) {/* XXX: there is no library to finalize the header... */ 655 rth->ip6r_len = rth->ip6r_segleft * 2; 656 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 657 (void *)rth, (rth->ip6r_len + 1) << 3)) { 658 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 659 strerror(errno)); 660 exit(1); 661 } 662 } 663 #else /* old advanced API */ 664 if (cmsg != NULL) { 665 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 666 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 667 rtbuf, cmsg->cmsg_len) < 0) { 668 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 669 strerror(errno)); 670 exit(1); 671 } 672 } 673 #endif /* USE_RFC2292BIS */ 674 #ifdef IPSEC 675 #ifdef IPSEC_POLICY_IPSEC 676 /* 677 * do not raise error even if setsockopt fails, kernel may have ipsec 678 * turned off. 679 */ 680 if (setpolicy(sndsock, "in bypass") < 0) 681 errx(1, ipsec_strerror()); 682 if (setpolicy(sndsock, "out bypass") < 0) 683 errx(1, ipsec_strerror()); 684 #else 685 { 686 int level = IPSEC_LEVEL_BYPASS; 687 688 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 689 sizeof(level)); 690 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 691 sizeof(level)); 692 #ifdef IP_AUTH_TRANS_LEVEL 693 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 694 sizeof(level)); 695 #else 696 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 697 sizeof(level)); 698 #endif 699 #ifdef IP_AUTH_NETWORK_LEVEL 700 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 701 sizeof(level)); 702 #endif 703 } 704 #endif /*IPSEC_POLICY_IPSEC*/ 705 #endif /*IPSEC*/ 706 707 /* 708 * Source selection 709 */ 710 bzero(&Src, sizeof(Src)); 711 if (source) { 712 struct addrinfo hints, *res; 713 int error; 714 715 memset(&hints, 0, sizeof(hints)); 716 hints.ai_family = AF_INET6; 717 hints.ai_socktype = SOCK_DGRAM; /*dummy*/ 718 hints.ai_flags = AI_NUMERICHOST; 719 error = getaddrinfo(source, "0", &hints, &res); 720 if (error) { 721 Printf("traceroute6: %s: %s\n", source, 722 gai_strerror(error)); 723 exit(1); 724 } 725 if (res->ai_addrlen > sizeof(Src)) { 726 Printf("traceroute6: %s: %s\n", source, 727 gai_strerror(error)); 728 exit(1); 729 } 730 memcpy(&Src, res->ai_addr, res->ai_addrlen); 731 freeaddrinfo(res); 732 } else { 733 struct sockaddr_in6 Nxt; 734 int dummy, len; 735 736 Nxt = Dst; 737 Nxt.sin6_port = htons(DUMMY_PORT); 738 if (cmsg != NULL) 739 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 740 sizeof(Nxt.sin6_addr)); 741 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 742 perror("socket"); 743 exit(1); 744 } 745 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) { 746 perror("connect"); 747 exit(1); 748 } 749 len = sizeof(Src); 750 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) { 751 perror("getsockname"); 752 exit(1); 753 } 754 if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 755 src0, sizeof(src0), NULL, 0, 756 NI_NUMERICHOST | niflag)) { 757 Fprintf(stderr, "getnameinfo failed for source\n"); 758 exit(1); 759 } 760 source = src0; 761 close(dummy); 762 } 763 764 #if 1 765 ident = (getpid() & 0xffff) | 0x8000; 766 #else 767 ident = 0; /*let the kernel pick one*/ 768 #endif 769 Src.sin6_port = htons(ident); 770 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) { 771 perror("bind"); 772 exit(1); 773 } 774 775 if (ident == 0) { 776 int len; 777 778 len = sizeof(Src); 779 if (getsockname(sndsock, (struct sockaddr *)&Src, &i) < 0) { 780 perror("getsockname"); 781 exit(1); 782 } 783 ident = ntohs(Src.sin6_port); 784 } 785 786 /* 787 * Message to users 788 */ 789 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 790 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag)) 791 strcpy(hbuf, "(invalid)"); 792 Fprintf(stderr, "traceroute6"); 793 Fprintf(stderr, " to %s (%s)", hostname, hbuf); 794 if (source) 795 Fprintf(stderr, " from %s", source); 796 Fprintf(stderr, 797 ", %d hops max, %d byte packets\n", 798 max_hops, datalen); 799 (void) fflush(stderr); 800 801 if (first_hop > 1) 802 Printf("Skipping %d intermediate hops\n", first_hop - 1); 803 804 /* 805 * Main loop 806 */ 807 for (hops = first_hop; hops <= max_hops; ++hops) { 808 struct in6_addr lastaddr; 809 int got_there = 0; 810 int unreachable = 0; 811 812 Printf("%2d ", hops); 813 bzero(&lastaddr, sizeof(lastaddr)); 814 for (probe = 0; probe < nprobes; ++probe) { 815 int cc; 816 struct timeval t1, t2; 817 struct timezone tz; 818 819 (void) gettimeofday(&t1, &tz); 820 send_probe(++seq, hops); 821 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 822 (void) gettimeofday(&t2, &tz); 823 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 824 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 825 &lastaddr)) { 826 print(&rcvmhdr, cc); 827 lastaddr = Rcv.sin6_addr; 828 } 829 Printf(" %g ms", deltaT(&t1, &t2)); 830 switch(i - 1) { 831 case ICMP6_DST_UNREACH_NOROUTE: 832 ++unreachable; 833 Printf(" !N"); 834 break; 835 case ICMP6_DST_UNREACH_ADMIN: 836 ++unreachable; 837 Printf(" !P"); 838 break; 839 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 840 ++unreachable; 841 Printf(" !S"); 842 break; 843 case ICMP6_DST_UNREACH_ADDR: 844 ++unreachable; 845 Printf(" !A"); 846 break; 847 case ICMP6_DST_UNREACH_NOPORT: 848 if (rcvhlim >= 0 && 849 rcvhlim <= 1) 850 Printf(" !"); 851 ++got_there; 852 break; 853 } 854 break; 855 } 856 } 857 if (cc == 0) 858 Printf(" *"); 859 (void) fflush(stdout); 860 } 861 putchar('\n'); 862 if (got_there || 863 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 864 exit(0); 865 } 866 } 867 868 exit(0); 869 } 870 871 int 872 wait_for_reply(sock, mhdr) 873 int sock; 874 struct msghdr *mhdr; 875 { 876 fd_set fds; 877 struct timeval wait; 878 int cc = 0; 879 880 FD_ZERO(&fds); 881 FD_SET(sock, &fds); 882 wait.tv_sec = waittime; wait.tv_usec = 0; 883 884 if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0) 885 cc = recvmsg(rcvsock, mhdr, 0); 886 887 return(cc); 888 } 889 890 #ifdef IPSEC 891 #ifdef IPSEC_POLICY_IPSEC 892 int 893 setpolicy(so, policy) 894 int so; 895 char *policy; 896 { 897 char *buf; 898 899 buf = ipsec_set_policy(policy, strlen(policy)); 900 if (buf == NULL) { 901 warnx("%s", ipsec_strerror()); 902 return -1; 903 } 904 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 905 buf, ipsec_get_policylen(buf)); 906 907 free(buf); 908 909 return 0; 910 } 911 #endif 912 #endif 913 914 void 915 send_probe(seq, hops) 916 int seq, hops; 917 { 918 struct opacket *op = outpacket; 919 int i; 920 921 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 922 (char *)&hops, sizeof(hops)) < 0) { 923 perror("setsockopt IPV6_UNICAST_HOPS"); 924 } 925 926 Dst.sin6_port = htons(port + seq); 927 928 op->seq = seq; 929 op->hops = hops; 930 (void) gettimeofday(&op->tv, &tz); 931 932 i = sendto(sndsock, (char *)outpacket, datalen , 0, 933 (struct sockaddr *)&Dst, Dst.sin6_len); 934 if (i < 0 || i != datalen) { 935 if (i<0) 936 perror("sendto"); 937 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 938 datalen, i); 939 (void) fflush(stdout); 940 } 941 } 942 943 int 944 get_hoplim(mhdr) 945 struct msghdr *mhdr; 946 { 947 struct cmsghdr *cm; 948 949 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 950 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 951 if (cm->cmsg_level == IPPROTO_IPV6 && 952 cm->cmsg_type == IPV6_HOPLIMIT && 953 cm->cmsg_len == CMSG_LEN(sizeof(int))) 954 return(*(int *)CMSG_DATA(cm)); 955 } 956 957 return(-1); 958 } 959 960 double 961 deltaT(t1p, t2p) 962 struct timeval *t1p, *t2p; 963 { 964 register double dt; 965 966 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 967 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 968 return (dt); 969 } 970 971 972 /* 973 * Convert an ICMP "type" field to a printable string. 974 */ 975 char * 976 pr_type(t0) 977 int t0; 978 { 979 u_char t = t0 & 0xff; 980 char *cp; 981 982 switch (t) { 983 case ICMP6_DST_UNREACH: 984 cp = "Destination Unreachable"; 985 break; 986 case ICMP6_PACKET_TOO_BIG: 987 cp = "Pakcet Too Big"; 988 break; 989 case ICMP6_TIME_EXCEEDED: 990 cp = "Time Exceeded"; 991 break; 992 case ICMP6_PARAM_PROB: 993 cp = "Parameter Problem"; 994 break; 995 case ICMP6_ECHO_REQUEST: 996 cp = "Echo Request"; 997 break; 998 case ICMP6_ECHO_REPLY: 999 cp = "Echo Reply"; 1000 break; 1001 case ICMP6_MEMBERSHIP_QUERY: 1002 cp = "Group Membership Query"; 1003 break; 1004 case ICMP6_MEMBERSHIP_REPORT: 1005 cp = "Group Membership Report"; 1006 break; 1007 case ICMP6_MEMBERSHIP_REDUCTION: 1008 cp = "Group Membership Reduction"; 1009 break; 1010 case ND_ROUTER_SOLICIT: 1011 cp = "Router Solicitation"; 1012 break; 1013 case ND_ROUTER_ADVERT: 1014 cp = "Router Advertisement"; 1015 break; 1016 case ND_NEIGHBOR_SOLICIT: 1017 cp = "Neighbor Solicitation"; 1018 break; 1019 case ND_NEIGHBOR_ADVERT: 1020 cp = "Neighbor Advertisement"; 1021 break; 1022 case ND_REDIRECT: 1023 cp = "Redirect"; 1024 break; 1025 default: 1026 cp = "Unknown"; 1027 break; 1028 } 1029 return cp; 1030 } 1031 1032 1033 int 1034 packet_ok(mhdr, cc, seq) 1035 struct msghdr *mhdr; 1036 int cc; 1037 int seq; 1038 { 1039 register struct icmp6_hdr *icp; 1040 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1041 u_char type, code; 1042 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1043 struct cmsghdr *cm; 1044 int *hlimp; 1045 char hbuf[NI_MAXHOST]; 1046 1047 #ifdef OLDRAWSOCKET 1048 int hlen; 1049 struct ip6_hdr *ip; 1050 #endif 1051 1052 #ifdef OLDRAWSOCKET 1053 ip = (struct ip6_hdr *) buf; 1054 hlen = sizeof(struct ip6_hdr); 1055 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1056 if (verbose) { 1057 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1058 hbuf, sizeof(hbuf), NULL, 0, 1059 NI_NUMERICHOST | niflag) != 0) 1060 strcpy(hbuf, "invalid"); 1061 Printf("packet too short (%d bytes) from %s\n", cc, 1062 hbuf); 1063 } 1064 return (0); 1065 } 1066 cc -= hlen; 1067 icp = (struct icmp6_hdr *)(buf + hlen); 1068 #else 1069 if (cc < sizeof(struct icmp6_hdr)) { 1070 if (verbose) { 1071 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1072 hbuf, sizeof(hbuf), NULL, 0, 1073 NI_NUMERICHOST | niflag) != 0) 1074 strcpy(hbuf, "invalid"); 1075 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1076 } 1077 return(0); 1078 } 1079 icp = (struct icmp6_hdr *)buf; 1080 #endif 1081 /* get optional information via advanced API */ 1082 rcvpktinfo = NULL; 1083 hlimp = NULL; 1084 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1085 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1086 if (cm->cmsg_level == IPPROTO_IPV6 && 1087 cm->cmsg_type == IPV6_PKTINFO && 1088 cm->cmsg_len == 1089 CMSG_LEN(sizeof(struct in6_pktinfo))) 1090 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1091 1092 if (cm->cmsg_level == IPPROTO_IPV6 && 1093 cm->cmsg_type == IPV6_HOPLIMIT && 1094 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1095 hlimp = (int *)CMSG_DATA(cm); 1096 } 1097 if (rcvpktinfo == NULL || hlimp == NULL) { 1098 warnx("failed to get received hop limit or packet info"); 1099 #if 0 1100 return(0); 1101 #else 1102 rcvhlim = 0; /*XXX*/ 1103 #endif 1104 } 1105 else 1106 rcvhlim = *hlimp; 1107 1108 type = icp->icmp6_type; 1109 code = icp->icmp6_code; 1110 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1111 || type == ICMP6_DST_UNREACH) { 1112 struct ip6_hdr *hip; 1113 struct udphdr *up; 1114 1115 hip = (struct ip6_hdr *)(icp + 1); 1116 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1117 if (verbose) 1118 warnx("failed to get upper layer header"); 1119 return(0); 1120 } 1121 if (up->uh_sport == htons(ident) && 1122 up->uh_dport == htons(port+seq)) 1123 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1124 } 1125 if (verbose) { 1126 int i; 1127 u_int8_t *p; 1128 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1129 1130 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1131 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1132 strcpy(sbuf, "invalid"); 1133 Printf("\n%d bytes from %s to %s", cc, sbuf, 1134 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1135 dbuf, sizeof(dbuf)) 1136 : "?"); 1137 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1138 icp->icmp6_code); 1139 p = (u_int8_t *)(icp + 1); 1140 #define WIDTH 16 1141 for (i = 0; i < cc; i++) { 1142 if (i % WIDTH == 0) 1143 Printf("%04x:", i); 1144 if (i % 4 == 0) 1145 Printf(" "); 1146 Printf("%02x", p[i]); 1147 if (i % WIDTH == WIDTH - 1) 1148 Printf("\n"); 1149 } 1150 if (cc % WIDTH != 0) 1151 Printf("\n"); 1152 } 1153 return(0); 1154 } 1155 1156 /* 1157 * Increment pointer until find the UDP header. 1158 */ 1159 struct udphdr * 1160 get_udphdr(ip6, lim) 1161 struct ip6_hdr *ip6; 1162 u_char *lim; 1163 { 1164 u_char *cp = (u_char *)ip6, nh; 1165 int hlen; 1166 1167 if (cp + sizeof(*ip6) >= lim) 1168 return(NULL); 1169 1170 nh = ip6->ip6_nxt; 1171 cp += sizeof(struct ip6_hdr); 1172 1173 while(lim - cp >= 8) { 1174 switch(nh) { 1175 case IPPROTO_ESP: 1176 case IPPROTO_TCP: 1177 case IPPROTO_ICMPV6: 1178 return(NULL); 1179 case IPPROTO_UDP: 1180 return((struct udphdr *)cp); 1181 case IPPROTO_FRAGMENT: 1182 hlen = sizeof(struct ip6_frag); 1183 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1184 break; 1185 case IPPROTO_AH: 1186 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1187 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1188 break; 1189 default: 1190 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1191 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1192 break; 1193 } 1194 1195 cp += hlen; 1196 } 1197 1198 return(NULL); 1199 } 1200 1201 void 1202 print(mhdr, cc) 1203 struct msghdr *mhdr; 1204 int cc; 1205 { 1206 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1207 char hbuf[NI_MAXHOST]; 1208 1209 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1210 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1211 strcpy(hbuf, "invalid"); 1212 if (nflag) 1213 Printf(" %s", hbuf); 1214 else if (lflag) 1215 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1216 else 1217 Printf(" %s", inetname((struct sockaddr *)from)); 1218 1219 if (verbose) { 1220 #ifdef OLDRAWSOCKET 1221 Printf(" %d bytes to %s", cc, 1222 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1223 hbuf, sizeof(hbuf)) 1224 : "?"); 1225 #else 1226 Printf(" %d bytes of data to %s", cc, 1227 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1228 hbuf, sizeof(hbuf)) 1229 : "?"); 1230 #endif 1231 } 1232 } 1233 1234 /* 1235 * Subtract 2 timeval structs: out = out - in. 1236 * Out is assumed to be >= in. 1237 */ 1238 void 1239 tvsub(out, in) 1240 register struct timeval *out, *in; 1241 { 1242 if ((out->tv_usec -= in->tv_usec) < 0) { 1243 out->tv_sec--; 1244 out->tv_usec += 1000000; 1245 } 1246 out->tv_sec -= in->tv_sec; 1247 } 1248 1249 1250 /* 1251 * Construct an Internet address representation. 1252 * If the nflag has been supplied, give 1253 * numeric value, otherwise try for symbolic name. 1254 */ 1255 const char * 1256 inetname(sa) 1257 struct sockaddr *sa; 1258 { 1259 register char *cp; 1260 static char line[NI_MAXHOST]; 1261 static char domain[MAXHOSTNAMELEN + 1]; 1262 static int first = 1; 1263 1264 if (first && !nflag) { 1265 first = 0; 1266 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1267 (cp = index(domain, '.'))) 1268 (void) strcpy(domain, cp + 1); 1269 else 1270 domain[0] = 0; 1271 } 1272 cp = NULL; 1273 if (!nflag) { 1274 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1275 NI_NAMEREQD) == 0) { 1276 if ((cp = index(line, '.')) && 1277 !strcmp(cp + 1, domain)) 1278 *cp = 0; 1279 cp = line; 1280 } 1281 } 1282 if (cp) 1283 return cp; 1284 1285 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1286 NI_NUMERICHOST | niflag) != 0) 1287 strcpy(line, "invalid"); 1288 return line; 1289 } 1290 1291 void 1292 usage() 1293 { 1294 (void)fprintf(stderr, 1295 "usage: traceroute6 [-dlnrv] [-f first_hop] [-m max_hops] [-p port#] \n" 1296 " [-q nqueries] [-s src_addr] [-g gateway] [-w wait] host [data size]\n"); 1297 exit(1); 1298 } 1299
Indexes created Mon Oct 20 20:10:13 GMT 2025