traceroute6.c revision 1.41.4.2
1 /* $NetBSD: traceroute6.c,v 1.41.4.2 2013/01/16 05:34:12 yamt Exp $ */ 2 /* $KAME: traceroute6.c,v 1.67 2004/01/25 03:24:39 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. Neither the name of the University nor the names of its contributors 49 * may be used to endorse or promote products derived from this software 50 * without specific prior written permission. 51 * 52 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 53 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 54 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 55 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 56 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 57 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 58 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 59 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 60 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 61 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 62 * SUCH DAMAGE. 63 */ 64 65 #if 0 66 #ifndef lint 67 static char copyright[] = 68 "@(#) Copyright (c) 1990, 1993\n\ 69 The Regents of the University of California. All rights reserved.\n"; 70 #endif /* not lint */ 71 72 #ifndef lint 73 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 74 #endif /* not lint */ 75 #else 76 #include <sys/cdefs.h> 77 #ifndef lint 78 __RCSID("$NetBSD: traceroute6.c,v 1.41.4.2 2013/01/16 05:34:12 yamt Exp $"); 79 #endif 80 #endif 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 a 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 (at) 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 #include "as.h" 286 287 #define DUMMY_PORT 10010 288 289 #define MAXPACKET 65535 /* max ip packet size */ 290 291 #ifndef HAVE_GETIPNODEBYNAME 292 #define getipnodebyname(x, y, z, u) gethostbyname2((x), (y)) 293 #define freehostent(x) 294 #endif 295 296 /* 297 * format of a (udp) probe packet. 298 */ 299 struct tv32 { 300 u_int32_t tv32_sec; 301 u_int32_t tv32_usec; 302 }; 303 304 struct opacket { 305 u_char seq; /* sequence number of this packet */ 306 u_char hops; /* hop limit of the packet */ 307 u_char pad[2]; 308 struct tv32 tv; /* time packet left */ 309 } __packed; 310 311 static u_char packet[512]; /* last inbound (icmp) packet */ 312 static struct opacket *outpacket; /* last output (udp) packet */ 313 314 static ssize_t wait_for_reply(int, struct msghdr *); 315 #ifdef IPSEC 316 #ifdef IPSEC_POLICY_IPSEC 317 static int setpolicy(int so, const char *policy); 318 #endif 319 #endif 320 static void send_probe(int, u_long); 321 static struct udphdr *get_udphdr(struct ip6_hdr *, u_char *); 322 #if 0 323 static int get_hoplim(struct msghdr *); 324 #endif 325 static double deltaT(struct timeval *, struct timeval *); 326 static const char *pr_type(int); 327 static int packet_ok(struct msghdr *, ssize_t, int); 328 static void print(struct msghdr *, int); 329 static const char *inetname(struct sockaddr *); 330 static void usage(void) __attribute__((__noreturn__)); 331 332 static int rcvsock; /* receive (icmp) socket file descriptor */ 333 static int sndsock; /* send (udp) socket file descriptor */ 334 335 static struct msghdr rcvmhdr; 336 static struct iovec rcviov[2]; 337 static int rcvhlim; 338 static struct in6_pktinfo *rcvpktinfo; 339 340 static struct sockaddr_in6 Src, Dst, Rcv; 341 static u_long datalen; /* How much data */ 342 #define ICMP6ECHOLEN 8 343 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 344 static char rtbuf[2064]; 345 #ifdef USE_RFC3542 346 static struct ip6_rthdr *rth; 347 #endif 348 static struct cmsghdr *cmsg; 349 350 static char *source; 351 static char *hostname; 352 353 static u_long nprobes = 3; 354 static u_long first_hop = 1; 355 static u_long max_hops = 30; 356 static u_int16_t srcport; 357 static u_int16_t port = 32768+666;/* start udp dest port # for probe packets */ 358 static u_int16_t ident; 359 static int options; /* socket options */ 360 static int verbose; 361 static int waittime = 5; /* time to wait for response (in seconds) */ 362 static int nflag; /* print addresses numerically */ 363 static int useicmp; 364 static int lflag; /* print both numerical address & hostname */ 365 static int as_path; /* print as numbers for each hop */ 366 static char *as_server = NULL; 367 static void *asn; 368 369 int 370 main(int argc, char *argv[]) 371 { 372 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 373 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 374 int ch, i, on = 1, seq, rcvcmsglen, error; 375 u_long minlen; 376 struct addrinfo hints, *res; 377 static u_char *rcvcmsgbuf; 378 u_long probe, hops, lport; 379 struct hostent *hp; 380 size_t size; 381 382 /* 383 * Receive ICMP 384 */ 385 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 386 err(5, "socket(ICMPv6)"); 387 388 /* revoke privs */ 389 seteuid(getuid()); 390 setuid(getuid()); 391 392 size = sizeof(i); 393 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 394 max_hops = i; 395 396 /* specify to tell receiving interface */ 397 #ifdef IPV6_RECVPKTINFO 398 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 399 sizeof(on)) < 0) 400 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 401 #else /* old adv. API */ 402 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 403 sizeof(on)) < 0) 404 err(1, "setsockopt(IPV6_PKTINFO)"); 405 #endif 406 407 /* specify to tell value of hoplimit field of received IP6 hdr */ 408 #ifdef IPV6_RECVHOPLIMIT 409 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 410 sizeof(on)) < 0) 411 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 412 #else /* old adv. API */ 413 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 414 sizeof(on)) < 0) 415 err(1, "setsockopt(IPV6_HOPLIMIT)"); 416 #endif 417 418 seq = 0; 419 420 while ((ch = getopt(argc, argv, "aA:df:g:Ilm:np:q:rs:w:v")) != -1) 421 switch (ch) { 422 case 'a': 423 as_path = 1; 424 break; 425 case 'A': 426 as_path = 1; 427 as_server = optarg; 428 break; 429 case 'd': 430 options |= SO_DEBUG; 431 break; 432 case 'f': 433 ep = NULL; 434 errno = 0; 435 first_hop = strtoul(optarg, &ep, 0); 436 if (errno || !*optarg || *ep|| first_hop > 255) 437 errx(1, "Invalid min hoplimit `%s'", optarg); 438 break; 439 case 'g': 440 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 441 if (hp == NULL) 442 errx(1, "Unknown host `%s'", optarg); 443 #ifdef USE_RFC3542 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), IPV6_RTHDR_TYPE_0, 451 0)) == NULL) { 452 errx(1, "inet6_rth_init failed"); 453 } 454 } 455 if (inet6_rth_add((void *)rth, 456 (struct in6_addr *)hp->h_addr)) 457 errx(1, "inet6_rth_add failed for `%s'", 458 optarg); 459 #else /* old advanced API */ 460 if (cmsg == NULL) 461 cmsg = inet6_rthdr_init(rtbuf, 462 IPV6_RTHDR_TYPE_0); 463 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, 464 IPV6_RTHDR_LOOSE); 465 #endif 466 freehostent(hp); 467 break; 468 case 'I': 469 useicmp++; 470 /* same as ping6 */ 471 ident = htons(arc4random() & 0xffff); 472 break; 473 case 'l': 474 lflag++; 475 break; 476 case 'm': 477 ep = NULL; 478 errno = 0; 479 max_hops = strtoul(optarg, &ep, 0); 480 if (errno || !*optarg || *ep || max_hops > 255) 481 errx(1, "Invalid max hoplimit `%s'", optarg); 482 break; 483 case 'n': 484 nflag++; 485 break; 486 case 'p': 487 ep = NULL; 488 errno = 0; 489 lport = strtoul(optarg, &ep, 0); 490 if (errno || !*optarg || *ep) 491 errx(1, "Invalid port `%s'", optarg); 492 if (lport == 0 || lport != (lport & 0xffff)) 493 errx(1, "Port `%s' out of range", optarg); 494 port = lport & 0xffff; 495 break; 496 case 'q': 497 ep = NULL; 498 errno = 0; 499 nprobes = strtoul(optarg, &ep, 0); 500 if (errno || !*optarg || *ep) 501 errx(1, "Invalid nprobes `%s'", optarg); 502 if (nprobes < 1) 503 errx(1, "nprobes `%s' must be > 0", optarg); 504 break; 505 case 'r': 506 options |= SO_DONTROUTE; 507 break; 508 case 's': 509 /* 510 * set the ip source address of the outbound 511 * probe (e.g., on a multi-homed host). 512 */ 513 source = optarg; 514 break; 515 case 'v': 516 verbose++; 517 break; 518 case 'w': 519 ep = NULL; 520 errno = 0; 521 waittime = strtoul(optarg, &ep, 0); 522 if (errno || !*optarg || *ep) 523 errx(1, "Invalid wait time `%s'", optarg); 524 if (waittime <= 1) 525 errx(1, "Wait `%s' must be > 1 sec", optarg); 526 break; 527 default: 528 usage(); 529 } 530 argc -= optind; 531 argv += optind; 532 533 if (max_hops < first_hop) 534 errx(1, "max hoplimit `%lu' must be larger than " 535 "first hoplimit `%lu'", max_hops, first_hop); 536 537 if (argc < 1 || argc > 2) 538 usage(); 539 540 #if 1 541 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 542 #else 543 setlinebuf(stdout); 544 #endif 545 546 memset(&hints, 0, sizeof(hints)); 547 hints.ai_family = PF_INET6; 548 hints.ai_socktype = SOCK_RAW; 549 hints.ai_protocol = IPPROTO_ICMPV6; 550 hints.ai_flags = AI_CANONNAME; 551 error = getaddrinfo(*argv, NULL, &hints, &res); 552 if (error) 553 errx(1, "%s", gai_strerror(error)); 554 if (res->ai_addrlen != sizeof(Dst)) 555 errx(1, "size of sockaddr mismatch"); 556 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 557 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 558 if (!hostname) 559 err(1, NULL); 560 if (res->ai_next) { 561 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 562 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 563 strlcpy(hbuf, "?", sizeof(hbuf)); 564 warnx("`%s' has multiple addresses; using `%s'", 565 hostname, hbuf); 566 } 567 568 if (*++argv) { 569 ep = NULL; 570 errno = 0; 571 datalen = strtoul(*argv, &ep, 0); 572 if (errno || !*argv || *ep) 573 errx(1, "Invalid packet length `%s'", *argv); 574 } 575 if (useicmp) 576 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 577 else 578 minlen = sizeof(struct opacket); 579 if (datalen < minlen) 580 datalen = minlen; 581 else if (datalen >= MAXPACKET) 582 errx(1, "Packet size must be %lu <= s < %lu", 583 minlen, (u_long)MAXPACKET); 584 outpacket = (struct opacket *)malloc((unsigned)datalen); 585 if (!outpacket) 586 err(1, NULL); 587 memset(outpacket, 0, datalen); 588 589 /* initialize msghdr for receiving packets */ 590 rcviov[0].iov_base = (caddr_t)packet; 591 rcviov[0].iov_len = sizeof(packet); 592 rcvmhdr.msg_name = (caddr_t)&Rcv; 593 rcvmhdr.msg_namelen = sizeof(Rcv); 594 rcvmhdr.msg_iov = rcviov; 595 rcvmhdr.msg_iovlen = 1; 596 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 597 CMSG_SPACE(sizeof(int)); 598 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) 599 err(1, NULL); 600 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 601 rcvmhdr.msg_controllen = rcvcmsglen; 602 603 if (options & SO_DEBUG) 604 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 605 (char *)&on, sizeof(on)); 606 if (options & SO_DONTROUTE) 607 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 608 (char *)&on, sizeof(on)); 609 #ifdef IPSEC 610 #ifdef IPSEC_POLICY_IPSEC 611 /* 612 * do not raise error even if setsockopt fails, kernel may have ipsec 613 * turned off. 614 */ 615 if (setpolicy(rcvsock, "in bypass") < 0) 616 errx(1, "%s", ipsec_strerror()); 617 if (setpolicy(rcvsock, "out bypass") < 0) 618 errx(1, "%s", ipsec_strerror()); 619 #else 620 { 621 int level = IPSEC_LEVEL_NONE; 622 623 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 624 sizeof(level)); 625 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 626 sizeof(level)); 627 #ifdef IP_AUTH_TRANS_LEVEL 628 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 629 sizeof(level)); 630 #else 631 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 632 sizeof(level)); 633 #endif 634 #ifdef IP_AUTH_NETWORK_LEVEL 635 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 636 sizeof(level)); 637 #endif 638 } 639 #endif /*IPSEC_POLICY_IPSEC*/ 640 #endif /*IPSEC*/ 641 642 /* 643 * Send UDP or ICMP 644 */ 645 if (useicmp) { 646 sndsock = rcvsock; 647 } else { 648 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 649 err(5, "socket(SOCK_DGRAM)"); 650 } 651 #ifdef SO_SNDBUF 652 i = datalen; 653 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 654 sizeof(i)) < 0) 655 err(6, "setsockopt(SO_SNDBUF)"); 656 #endif /* SO_SNDBUF */ 657 if (options & SO_DEBUG) 658 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 659 (char *)&on, sizeof(on)); 660 if (options & SO_DONTROUTE) 661 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 662 (char *)&on, sizeof(on)); 663 #ifdef USE_RFC3542 664 if (rth) {/* XXX: there is no library to finalize the header... */ 665 rth->ip6r_len = rth->ip6r_segleft * 2; 666 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 667 (void *)rth, (rth->ip6r_len + 1) << 3)) 668 err(1, "setsockopt(IPV6_RTHDR)"); 669 } 670 #else /* old advanced API */ 671 if (cmsg != NULL) { 672 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 673 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 674 rtbuf, cmsg->cmsg_len) < 0) 675 err(1, "setsockopt(IPV6_PKTOPTIONS)"); 676 } 677 #endif /* USE_RFC3542 */ 678 #ifdef IPSEC 679 #ifdef IPSEC_POLICY_IPSEC 680 /* 681 * do not raise error even if setsockopt fails, kernel may have ipsec 682 * turned off. 683 */ 684 if (setpolicy(sndsock, "in bypass") < 0) 685 errx(1, "%s", ipsec_strerror()); 686 if (setpolicy(sndsock, "out bypass") < 0) 687 errx(1, "%s", ipsec_strerror()); 688 #else 689 { 690 int level = IPSEC_LEVEL_BYPASS; 691 692 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 693 sizeof(level)); 694 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 695 sizeof(level)); 696 #ifdef IP_AUTH_TRANS_LEVEL 697 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 698 sizeof(level)); 699 #else 700 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 701 sizeof(level)); 702 #endif 703 #ifdef IP_AUTH_NETWORK_LEVEL 704 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 705 sizeof(level)); 706 #endif 707 } 708 #endif /*IPSEC_POLICY_IPSEC*/ 709 #endif /*IPSEC*/ 710 711 /* 712 * Source selection 713 */ 714 memset(&Src, 0, sizeof(Src)); 715 if (source) { 716 struct addrinfo hints0, *res0; 717 int error0; 718 719 memset(&hints0, 0, sizeof(hints0)); 720 hints0.ai_family = AF_INET6; 721 hints0.ai_socktype = SOCK_DGRAM; /*dummy*/ 722 hints0.ai_flags = AI_NUMERICHOST; 723 error0 = getaddrinfo(source, "0", &hints0, &res0); 724 if (error0) 725 errx(1, "Cannot get address for `%s' (%s)", source, 726 gai_strerror(error0)); 727 if (res0->ai_addrlen > sizeof(Src)) 728 errx(1, "Bad incompatible address length"); 729 memcpy(&Src, res0->ai_addr, res0->ai_addrlen); 730 freeaddrinfo(res0); 731 } else { 732 struct sockaddr_in6 Nxt; 733 int dummy; 734 socklen_t len; 735 736 Nxt = Dst; 737 Nxt.sin6_port = htons(DUMMY_PORT); 738 if (cmsg != NULL) 739 memcpy( &Nxt.sin6_addr, inet6_rthdr_getaddr(cmsg, 1), 740 sizeof(Nxt.sin6_addr)); 741 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 742 err(1, "socket"); 743 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) 744 err(1, "connect"); 745 len = sizeof(Src); 746 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) 747 err(1, "getsockname"); 748 if ((error = getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 749 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST))) 750 errx(1, "getnameinfo failed for source (%s)", 751 gai_strerror(error)); 752 source = src0; 753 close(dummy); 754 } 755 756 Src.sin6_port = htons(0); 757 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) 758 err(1, "bind"); 759 760 { 761 socklen_t len; 762 763 len = sizeof(Src); 764 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) 765 err(1, "bind"); 766 srcport = ntohs(Src.sin6_port); 767 } 768 769 if (as_path) { 770 asn = as_setup(as_server); 771 if (asn == NULL) { 772 warnx("as_setup failed, AS# lookups disabled"); 773 (void)fflush(stderr); 774 as_path = 0; 775 } 776 } 777 778 /* 779 * Message to users 780 */ 781 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 782 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 783 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 784 fprintf(stderr, "traceroute6"); 785 fprintf(stderr, " to %s (%s)", hostname, hbuf); 786 if (source) 787 fprintf(stderr, " from %s", source); 788 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 789 max_hops, datalen); 790 (void) fflush(stderr); 791 792 if (first_hop > 1) 793 printf("Skipping %lu intermediate hops\n", first_hop - 1); 794 795 /* 796 * Main loop 797 */ 798 for (hops = first_hop; hops <= max_hops; ++hops) { 799 struct in6_addr lastaddr; 800 int got_there = 0; 801 u_long unreachable = 0; 802 803 printf("%2lu ", hops); 804 memset(&lastaddr, 0, sizeof(lastaddr)); 805 for (probe = 0; probe < nprobes; ++probe) { 806 int cc; 807 struct timeval t1, t2; 808 809 (void) gettimeofday(&t1, NULL); 810 if (!useicmp && htons((in_port_t)(port + seq + 1)) == 0) 811 seq++; 812 send_probe(++seq, hops); 813 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 814 (void) gettimeofday(&t2, NULL); 815 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 816 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 817 &lastaddr)) { 818 print(&rcvmhdr, cc); 819 lastaddr = Rcv.sin6_addr; 820 } 821 printf(" %g ms", deltaT(&t1, &t2)); 822 switch (i - 1) { 823 case ICMP6_DST_UNREACH_NOROUTE: 824 ++unreachable; 825 printf(" !N"); 826 break; 827 case ICMP6_DST_UNREACH_ADMIN: 828 ++unreachable; 829 printf(" !X"); 830 break; 831 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 832 ++unreachable; 833 printf(" !S"); 834 break; 835 case ICMP6_DST_UNREACH_ADDR: 836 ++unreachable; 837 printf(" !H"); 838 break; 839 case ICMP6_DST_UNREACH_NOPORT: 840 if (rcvhlim >= 0 && 841 rcvhlim <= 1) 842 printf(" !"); 843 ++got_there; 844 break; 845 } 846 break; 847 } 848 } 849 if (cc == 0) 850 printf(" *"); 851 (void) fflush(stdout); 852 } 853 putchar('\n'); 854 if (got_there || 855 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 856 exit(0); 857 } 858 } 859 860 if (as_path) 861 as_shutdown(asn); 862 863 exit(0); 864 } 865 866 static ssize_t 867 wait_for_reply(int sock, struct msghdr *mhdr) 868 { 869 #ifdef HAVE_POLL 870 struct pollfd pfd[1]; 871 ssize_t cc = 0; 872 873 pfd[0].fd = sock; 874 pfd[0].events = POLLIN; 875 pfd[0].revents = 0; 876 877 if (poll(pfd, 1, waittime * 1000) > 0) 878 cc = recvmsg(rcvsock, mhdr, 0); 879 880 return cc; 881 #else 882 fd_set *fdsp; 883 struct timeval wait; 884 ssize_t cc = 0; 885 int fdsn; 886 887 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 888 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 889 err(1, "malloc"); 890 memset(fdsp, 0, fdsn); 891 FD_SET(sock, fdsp); 892 wait.tv_sec = waittime; wait.tv_usec = 0; 893 894 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 895 cc = recvmsg(rcvsock, mhdr, 0); 896 897 free(fdsp); 898 return cc; 899 #endif 900 } 901 902 #ifdef IPSEC 903 #ifdef IPSEC_POLICY_IPSEC 904 static int 905 setpolicy(int so, const char *policy) 906 { 907 char *buf; 908 909 buf = ipsec_set_policy(policy, strlen(policy)); 910 if (buf == NULL) { 911 warnx("%s", ipsec_strerror()); 912 return -1; 913 } 914 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 915 buf, ipsec_get_policylen(buf)); 916 917 free(buf); 918 919 return 0; 920 } 921 #endif 922 #endif 923 924 static void 925 send_probe(int seq, u_long hops) 926 { 927 struct timeval tv; 928 struct tv32 tv32; 929 int i; 930 931 i = hops; 932 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 933 (char *)&i, sizeof(i)) < 0) 934 warn("setsockopt IPV6_UNICAST_HOPS"); 935 936 Dst.sin6_port = htons(port + seq); 937 (void) gettimeofday(&tv, NULL); 938 tv32.tv32_sec = htonl(tv.tv_sec); 939 tv32.tv32_usec = htonl(tv.tv_usec); 940 941 if (useicmp) { 942 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 943 944 icp->icmp6_type = ICMP6_ECHO_REQUEST; 945 icp->icmp6_code = 0; 946 icp->icmp6_cksum = 0; 947 icp->icmp6_id = ident; 948 icp->icmp6_seq = htons(seq); 949 memcpy(((u_int8_t *)outpacket + ICMP6ECHOLEN), &tv32, 950 sizeof(tv32)); 951 } else { 952 struct opacket *op = outpacket; 953 954 op->seq = seq; 955 op->hops = hops; 956 memcpy(&op->tv, &tv32, sizeof tv32); 957 } 958 959 i = sendto(sndsock, (char *)outpacket, datalen , 0, 960 (struct sockaddr *)&Dst, Dst.sin6_len); 961 if (i < 0 || i != (int)datalen) { 962 if (i < 0) 963 warnx("sendto"); 964 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 965 hostname, datalen, i); 966 (void) fflush(stdout); 967 } 968 } 969 970 #if 0 971 static int 972 get_hoplim(struct msghdr *mhdr) 973 { 974 struct cmsghdr *cm; 975 976 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 977 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 978 if (cm->cmsg_level == IPPROTO_IPV6 && 979 cm->cmsg_type == IPV6_HOPLIMIT && 980 cm->cmsg_len == CMSG_LEN(sizeof(int))) 981 return *(int *)CMSG_DATA(cm); 982 } 983 984 return -1; 985 } 986 #endif 987 988 static double 989 deltaT(struct timeval *t1p, struct timeval *t2p) 990 { 991 double dt; 992 993 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 994 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 995 return dt; 996 } 997 998 /* 999 * Convert an ICMP "type" field to a printable string. 1000 */ 1001 static const char * 1002 pr_type(int t0) 1003 { 1004 u_char t = t0 & 0xff; 1005 const char *cp; 1006 1007 switch (t) { 1008 case ICMP6_DST_UNREACH: 1009 cp = "Destination Unreachable"; 1010 break; 1011 case ICMP6_PACKET_TOO_BIG: 1012 cp = "Packet Too Big"; 1013 break; 1014 case ICMP6_TIME_EXCEEDED: 1015 cp = "Time Exceeded"; 1016 break; 1017 case ICMP6_PARAM_PROB: 1018 cp = "Parameter Problem"; 1019 break; 1020 case ICMP6_ECHO_REQUEST: 1021 cp = "Echo Request"; 1022 break; 1023 case ICMP6_ECHO_REPLY: 1024 cp = "Echo Reply"; 1025 break; 1026 case ICMP6_MEMBERSHIP_QUERY: 1027 cp = "Group Membership Query"; 1028 break; 1029 case ICMP6_MEMBERSHIP_REPORT: 1030 cp = "Group Membership Report"; 1031 break; 1032 case ICMP6_MEMBERSHIP_REDUCTION: 1033 cp = "Group Membership Reduction"; 1034 break; 1035 case ND_ROUTER_SOLICIT: 1036 cp = "Router Solicitation"; 1037 break; 1038 case ND_ROUTER_ADVERT: 1039 cp = "Router Advertisement"; 1040 break; 1041 case ND_NEIGHBOR_SOLICIT: 1042 cp = "Neighbor Solicitation"; 1043 break; 1044 case ND_NEIGHBOR_ADVERT: 1045 cp = "Neighbor Advertisement"; 1046 break; 1047 case ND_REDIRECT: 1048 cp = "Redirect"; 1049 break; 1050 default: 1051 cp = "Unknown"; 1052 break; 1053 } 1054 return cp; 1055 } 1056 1057 static int 1058 packet_ok(struct msghdr *mhdr, ssize_t cc, int seq) 1059 { 1060 struct icmp6_hdr *icp; 1061 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1062 u_char type, code; 1063 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1064 struct cmsghdr *cm; 1065 int *hlimp; 1066 char hbuf[NI_MAXHOST]; 1067 1068 #ifdef OLDRAWSOCKET 1069 int hlen; 1070 struct ip6_hdr *ip; 1071 #endif 1072 1073 #ifdef OLDRAWSOCKET 1074 ip = (struct ip6_hdr *) buf; 1075 hlen = sizeof(struct ip6_hdr); 1076 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1077 if (verbose) { 1078 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1079 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1080 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1081 printf("packet too short (%d bytes) from %s\n", cc, 1082 hbuf); 1083 } 1084 return 0; 1085 } 1086 cc -= hlen; 1087 icp = (struct icmp6_hdr *)(buf + hlen); 1088 #else 1089 if (cc < (ssize_t)sizeof(struct icmp6_hdr)) { 1090 if (verbose) { 1091 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1092 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1093 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1094 printf("data too short (%zd bytes) from %s\n", cc, 1095 hbuf); 1096 } 1097 return 0; 1098 } 1099 icp = (struct icmp6_hdr *)buf; 1100 #endif 1101 /* get optional information via advanced API */ 1102 rcvpktinfo = NULL; 1103 hlimp = NULL; 1104 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1105 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1106 if (cm->cmsg_level == IPPROTO_IPV6 && 1107 cm->cmsg_type == IPV6_PKTINFO && 1108 cm->cmsg_len == 1109 CMSG_LEN(sizeof(struct in6_pktinfo))) 1110 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1111 1112 if (cm->cmsg_level == IPPROTO_IPV6 && 1113 cm->cmsg_type == IPV6_HOPLIMIT && 1114 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1115 hlimp = (int *)CMSG_DATA(cm); 1116 } 1117 if (rcvpktinfo == NULL || hlimp == NULL) { 1118 warnx("failed to get received hop limit or packet info"); 1119 #if 0 1120 return 0; 1121 #else 1122 rcvhlim = 0; /*XXX*/ 1123 #endif 1124 } 1125 else 1126 rcvhlim = *hlimp; 1127 1128 type = icp->icmp6_type; 1129 code = icp->icmp6_code; 1130 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1131 || type == ICMP6_DST_UNREACH) { 1132 struct ip6_hdr *hip; 1133 struct udphdr *up; 1134 1135 hip = (struct ip6_hdr *)(icp + 1); 1136 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1137 if (verbose) 1138 warnx("failed to get upper layer header"); 1139 return 0; 1140 } 1141 if (useicmp && 1142 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1143 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1144 return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1; 1145 else if (!useicmp && 1146 up->uh_sport == htons(srcport) && 1147 up->uh_dport == htons(port + seq)) 1148 return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1; 1149 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1150 if (icp->icmp6_id == ident && 1151 icp->icmp6_seq == htons(seq)) 1152 return ICMP6_DST_UNREACH_NOPORT + 1; 1153 } 1154 if (verbose) { 1155 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1156 u_int8_t *p; 1157 ssize_t i; 1158 1159 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1160 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1161 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1162 printf("\n%zd bytes from %s to %s", cc, sbuf, 1163 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1164 dbuf, sizeof(dbuf)) : "?"); 1165 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1166 icp->icmp6_code); 1167 p = (u_int8_t *)(icp + 1); 1168 #define WIDTH 16 1169 for (i = 0; i < cc; i++) { 1170 if (i % WIDTH == 0) 1171 printf("%04zx:", i); 1172 if (i % 4 == 0) 1173 printf(" "); 1174 printf("%02x", p[i]); 1175 if (i % WIDTH == WIDTH - 1) 1176 printf("\n"); 1177 } 1178 if (cc % WIDTH != 0) 1179 printf("\n"); 1180 } 1181 return 0; 1182 } 1183 1184 /* 1185 * Increment pointer until find the UDP or ICMP header. 1186 */ 1187 static struct udphdr * 1188 get_udphdr(struct ip6_hdr *ip6, u_char *lim) 1189 { 1190 u_char *cp = (u_char *)ip6, nh; 1191 int hlen; 1192 1193 if (cp + sizeof(*ip6) >= lim) 1194 return NULL; 1195 1196 nh = ip6->ip6_nxt; 1197 cp += sizeof(struct ip6_hdr); 1198 1199 while (lim - cp >= 8) { 1200 switch (nh) { 1201 case IPPROTO_ESP: 1202 case IPPROTO_TCP: 1203 return NULL; 1204 case IPPROTO_ICMPV6: 1205 return useicmp ? (struct udphdr *)cp : NULL; 1206 case IPPROTO_UDP: 1207 return useicmp ? NULL : (struct udphdr *)cp; 1208 case IPPROTO_FRAGMENT: 1209 hlen = sizeof(struct ip6_frag); 1210 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1211 break; 1212 case IPPROTO_AH: 1213 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1214 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1215 break; 1216 default: 1217 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1218 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1219 break; 1220 } 1221 1222 cp += hlen; 1223 } 1224 1225 return NULL; 1226 } 1227 1228 static void 1229 print(struct msghdr *mhdr, int cc) 1230 { 1231 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1232 char hbuf[NI_MAXHOST]; 1233 1234 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1235 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1236 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1237 if (as_path) 1238 printf(" [AS%u]", as_lookup(asn, hbuf, AF_INET6)); 1239 if (nflag) 1240 printf(" %s", hbuf); 1241 else if (lflag) 1242 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1243 else 1244 printf(" %s", inetname((struct sockaddr *)from)); 1245 1246 if (verbose) { 1247 #ifdef OLDRAWSOCKET 1248 printf(" %d bytes to %s", cc, 1249 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1250 hbuf, sizeof(hbuf)) : "?"); 1251 #else 1252 printf(" %d bytes of data to %s", cc, 1253 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1254 hbuf, sizeof(hbuf)) : "?"); 1255 #endif 1256 } 1257 } 1258 1259 /* 1260 * Construct an Internet address representation. 1261 * If the nflag has been supplied, give 1262 * numeric value, otherwise try for symbolic name. 1263 */ 1264 static const char * 1265 inetname(struct sockaddr *sa) 1266 { 1267 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1268 static int first = 1; 1269 char *cp; 1270 1271 if (first && !nflag) { 1272 first = 0; 1273 if (gethostname(domain, sizeof(domain)) == 0 && 1274 (cp = strchr(domain, '.'))) 1275 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1276 else 1277 domain[0] = 0; 1278 } 1279 cp = NULL; 1280 if (!nflag) { 1281 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1282 NI_NAMEREQD) == 0) { 1283 if ((cp = strchr(line, '.')) && 1284 !strcmp(cp + 1, domain)) 1285 *cp = 0; 1286 cp = line; 1287 } 1288 } 1289 if (cp) 1290 return cp; 1291 1292 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1293 NI_NUMERICHOST) != 0) 1294 strlcpy(line, "invalid", sizeof(line)); 1295 return line; 1296 } 1297 1298 static void 1299 usage(void) 1300 { 1301 1302 fprintf(stderr, 1303 "Usage: %s [-adIlnrv] [-A as_server] [-f firsthop] [-g gateway]\n" 1304 "\t[-m hoplimit] [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n", 1305 getprogname()); 1306 exit(1); 1307 } 1308
Indexes created Mon Oct 20 03:09:53 GMT 2025