traceroute6.c revision 1.46
1 /* $NetBSD: traceroute6.c,v 1.46 2018/04/23 09:47:03 maxv 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 1.46 2018/04/23 09:47:03 maxv 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 8 343 344 static char *source; 345 static char *hostname; 346 347 static u_long nprobes = 3; 348 static u_long first_hop = 1; 349 static u_long max_hops = 30; 350 static u_int16_t srcport; 351 static u_int16_t port = 32768+666;/* start udp dest port # for probe packets */ 352 static u_int16_t ident; 353 static int options; /* socket options */ 354 static int verbose; 355 static int waittime = 5; /* time to wait for response (in seconds) */ 356 static int nflag; /* print addresses numerically */ 357 static int useicmp; 358 static int lflag; /* print both numerical address & hostname */ 359 static int as_path; /* print as numbers for each hop */ 360 static char *as_server = NULL; 361 static void *asn; 362 363 int 364 main(int argc, char *argv[]) 365 { 366 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 367 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 368 int ch, i, on = 1, seq, rcvcmsglen, error; 369 u_long minlen; 370 struct addrinfo hints, *res; 371 static u_char *rcvcmsgbuf; 372 u_long probe, hops, lport; 373 size_t size; 374 375 /* 376 * Receive ICMP 377 */ 378 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 379 err(5, "socket(ICMPv6)"); 380 381 /* revoke privs */ 382 seteuid(getuid()); 383 setuid(getuid()); 384 385 size = sizeof(i); 386 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 387 max_hops = i; 388 389 /* specify to tell receiving interface */ 390 #ifdef IPV6_RECVPKTINFO 391 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 392 sizeof(on)) < 0) 393 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 394 #else /* old adv. API */ 395 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 396 sizeof(on)) < 0) 397 err(1, "setsockopt(IPV6_PKTINFO)"); 398 #endif 399 400 /* specify to tell value of hoplimit field of received IP6 hdr */ 401 #ifdef IPV6_RECVHOPLIMIT 402 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 403 sizeof(on)) < 0) 404 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 405 #else /* old adv. API */ 406 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 407 sizeof(on)) < 0) 408 err(1, "setsockopt(IPV6_HOPLIMIT)"); 409 #endif 410 411 seq = 0; 412 413 while ((ch = getopt(argc, argv, "aA:df:Ilm:np:q:rs:w:v")) != -1) 414 switch (ch) { 415 case 'a': 416 as_path = 1; 417 break; 418 case 'A': 419 as_path = 1; 420 as_server = optarg; 421 break; 422 case 'd': 423 options |= SO_DEBUG; 424 break; 425 case 'f': 426 ep = NULL; 427 errno = 0; 428 first_hop = strtoul(optarg, &ep, 0); 429 if (errno || !*optarg || *ep|| first_hop > 255) 430 errx(1, "Invalid min hoplimit `%s'", optarg); 431 break; 432 case 'I': 433 useicmp++; 434 /* same as ping6 */ 435 ident = htons(arc4random() & 0xffff); 436 break; 437 case 'l': 438 lflag++; 439 break; 440 case 'm': 441 ep = NULL; 442 errno = 0; 443 max_hops = strtoul(optarg, &ep, 0); 444 if (errno || !*optarg || *ep || max_hops > 255) 445 errx(1, "Invalid max hoplimit `%s'", optarg); 446 break; 447 case 'n': 448 nflag++; 449 break; 450 case 'p': 451 ep = NULL; 452 errno = 0; 453 lport = strtoul(optarg, &ep, 0); 454 if (errno || !*optarg || *ep) 455 errx(1, "Invalid port `%s'", optarg); 456 if (lport == 0 || lport != (lport & 0xffff)) 457 errx(1, "Port `%s' out of range", optarg); 458 port = lport & 0xffff; 459 break; 460 case 'q': 461 ep = NULL; 462 errno = 0; 463 nprobes = strtoul(optarg, &ep, 0); 464 if (errno || !*optarg || *ep) 465 errx(1, "Invalid nprobes `%s'", optarg); 466 if (nprobes < 1) 467 errx(1, "nprobes `%s' must be > 0", optarg); 468 break; 469 case 'r': 470 options |= SO_DONTROUTE; 471 break; 472 case 's': 473 /* 474 * set the ip source address of the outbound 475 * probe (e.g., on a multi-homed host). 476 */ 477 source = optarg; 478 break; 479 case 'v': 480 verbose++; 481 break; 482 case 'w': 483 ep = NULL; 484 errno = 0; 485 waittime = strtoul(optarg, &ep, 0); 486 if (errno || !*optarg || *ep) 487 errx(1, "Invalid wait time `%s'", optarg); 488 if (waittime <= 1) 489 errx(1, "Wait `%s' must be > 1 sec", optarg); 490 break; 491 default: 492 usage(); 493 } 494 argc -= optind; 495 argv += optind; 496 497 if (max_hops < first_hop) 498 errx(1, "max hoplimit `%lu' must be larger than " 499 "first hoplimit `%lu'", max_hops, first_hop); 500 501 if (argc < 1 || argc > 2) 502 usage(); 503 504 #if 1 505 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 506 #else 507 setlinebuf(stdout); 508 #endif 509 510 memset(&hints, 0, sizeof(hints)); 511 hints.ai_family = PF_INET6; 512 hints.ai_socktype = SOCK_RAW; 513 hints.ai_protocol = IPPROTO_ICMPV6; 514 hints.ai_flags = AI_CANONNAME; 515 error = getaddrinfo(*argv, NULL, &hints, &res); 516 if (error) 517 errx(1, "%s", gai_strerror(error)); 518 if (res->ai_addrlen != sizeof(Dst)) 519 errx(1, "size of sockaddr mismatch"); 520 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 521 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 522 if (!hostname) 523 err(1, NULL); 524 if (res->ai_next) { 525 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 526 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 527 strlcpy(hbuf, "?", sizeof(hbuf)); 528 warnx("`%s' has multiple addresses; using `%s'", 529 hostname, hbuf); 530 } 531 532 if (*++argv) { 533 ep = NULL; 534 errno = 0; 535 datalen = strtoul(*argv, &ep, 0); 536 if (errno || *ep) 537 errx(1, "Invalid packet length `%s'", *argv); 538 } 539 if (useicmp) 540 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 541 else 542 minlen = sizeof(struct opacket); 543 if (datalen < minlen) 544 datalen = minlen; 545 else if (datalen >= MAXPACKET) 546 errx(1, "Packet size must be %lu <= s < %lu", 547 minlen, (u_long)MAXPACKET); 548 outpacket = (struct opacket *)malloc((unsigned)datalen); 549 if (!outpacket) 550 err(1, NULL); 551 memset(outpacket, 0, datalen); 552 553 /* initialize msghdr for receiving packets */ 554 rcviov[0].iov_base = (caddr_t)packet; 555 rcviov[0].iov_len = sizeof(packet); 556 rcvmhdr.msg_name = (caddr_t)&Rcv; 557 rcvmhdr.msg_namelen = sizeof(Rcv); 558 rcvmhdr.msg_iov = rcviov; 559 rcvmhdr.msg_iovlen = 1; 560 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 561 CMSG_SPACE(sizeof(int)); 562 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) 563 err(1, NULL); 564 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 565 rcvmhdr.msg_controllen = rcvcmsglen; 566 567 if (options & SO_DEBUG) 568 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 569 (char *)&on, sizeof(on)); 570 if (options & SO_DONTROUTE) 571 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 572 (char *)&on, sizeof(on)); 573 #ifdef IPSEC 574 #ifdef IPSEC_POLICY_IPSEC 575 /* 576 * do not raise error even if setsockopt fails, kernel may have ipsec 577 * turned off. 578 */ 579 if (setpolicy(rcvsock, "in bypass") < 0) 580 errx(1, "%s", ipsec_strerror()); 581 if (setpolicy(rcvsock, "out bypass") < 0) 582 errx(1, "%s", ipsec_strerror()); 583 #else 584 { 585 int level = IPSEC_LEVEL_NONE; 586 587 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 588 sizeof(level)); 589 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 590 sizeof(level)); 591 #ifdef IP_AUTH_TRANS_LEVEL 592 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 593 sizeof(level)); 594 #else 595 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 596 sizeof(level)); 597 #endif 598 #ifdef IP_AUTH_NETWORK_LEVEL 599 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 600 sizeof(level)); 601 #endif 602 } 603 #endif /*IPSEC_POLICY_IPSEC*/ 604 #endif /*IPSEC*/ 605 606 /* 607 * Send UDP or ICMP 608 */ 609 if (useicmp) { 610 sndsock = rcvsock; 611 } else { 612 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 613 err(5, "socket(SOCK_DGRAM)"); 614 } 615 #ifdef SO_SNDBUF 616 i = datalen; 617 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 618 sizeof(i)) < 0) 619 err(6, "setsockopt(SO_SNDBUF)"); 620 #endif /* SO_SNDBUF */ 621 if (options & SO_DEBUG) 622 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 623 (char *)&on, sizeof(on)); 624 if (options & SO_DONTROUTE) 625 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 626 (char *)&on, sizeof(on)); 627 628 #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(sndsock, "in bypass") < 0) 635 errx(1, "%s", ipsec_strerror()); 636 if (setpolicy(sndsock, "out bypass") < 0) 637 errx(1, "%s", ipsec_strerror()); 638 #else 639 { 640 int level = IPSEC_LEVEL_BYPASS; 641 642 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 643 sizeof(level)); 644 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 645 sizeof(level)); 646 #ifdef IP_AUTH_TRANS_LEVEL 647 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 648 sizeof(level)); 649 #else 650 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 651 sizeof(level)); 652 #endif 653 #ifdef IP_AUTH_NETWORK_LEVEL 654 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 655 sizeof(level)); 656 #endif 657 } 658 #endif /*IPSEC_POLICY_IPSEC*/ 659 #endif /*IPSEC*/ 660 661 /* 662 * Source selection 663 */ 664 memset(&Src, 0, sizeof(Src)); 665 if (source) { 666 struct addrinfo hints0, *res0; 667 int error0; 668 669 memset(&hints0, 0, sizeof(hints0)); 670 hints0.ai_family = AF_INET6; 671 hints0.ai_socktype = SOCK_DGRAM; /*dummy*/ 672 hints0.ai_flags = AI_NUMERICHOST; 673 error0 = getaddrinfo(source, "0", &hints0, &res0); 674 if (error0) 675 errx(1, "Cannot get address for `%s' (%s)", source, 676 gai_strerror(error0)); 677 if (res0->ai_addrlen > sizeof(Src)) 678 errx(1, "Bad incompatible address length"); 679 memcpy(&Src, res0->ai_addr, res0->ai_addrlen); 680 freeaddrinfo(res0); 681 } else { 682 struct sockaddr_in6 Nxt; 683 int dummy; 684 socklen_t len; 685 686 Nxt = Dst; 687 Nxt.sin6_port = htons(DUMMY_PORT); 688 689 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 690 err(1, "socket"); 691 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) 692 err(1, "connect"); 693 len = sizeof(Src); 694 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) 695 err(1, "getsockname"); 696 if ((error = getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 697 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST))) 698 errx(1, "getnameinfo failed for source (%s)", 699 gai_strerror(error)); 700 source = src0; 701 close(dummy); 702 } 703 704 Src.sin6_port = htons(0); 705 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) 706 err(1, "bind"); 707 708 { 709 socklen_t len; 710 711 len = sizeof(Src); 712 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) 713 err(1, "bind"); 714 srcport = ntohs(Src.sin6_port); 715 } 716 717 if (as_path) { 718 asn = as_setup(as_server); 719 if (asn == NULL) { 720 warnx("as_setup failed, AS# lookups disabled"); 721 (void)fflush(stderr); 722 as_path = 0; 723 } 724 } 725 726 /* 727 * Message to users 728 */ 729 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 730 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 731 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 732 fprintf(stderr, "traceroute6"); 733 fprintf(stderr, " to %s (%s)", hostname, hbuf); 734 if (source) 735 fprintf(stderr, " from %s", source); 736 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 737 max_hops, datalen); 738 (void) fflush(stderr); 739 740 if (first_hop > 1) 741 printf("Skipping %lu intermediate hops\n", first_hop - 1); 742 743 /* 744 * Main loop 745 */ 746 for (hops = first_hop; hops <= max_hops; ++hops) { 747 struct in6_addr lastaddr; 748 int got_there = 0; 749 u_long unreachable = 0; 750 751 printf("%2lu ", hops); 752 memset(&lastaddr, 0, sizeof(lastaddr)); 753 for (probe = 0; probe < nprobes; ++probe) { 754 int cc; 755 struct timeval t1, t2; 756 757 (void) gettimeofday(&t1, NULL); 758 if (!useicmp && htons((in_port_t)(port + seq + 1)) == 0) 759 seq++; 760 send_probe(++seq, hops); 761 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 762 (void) gettimeofday(&t2, NULL); 763 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 764 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 765 &lastaddr)) { 766 print(&rcvmhdr, cc); 767 lastaddr = Rcv.sin6_addr; 768 } 769 printf(" %g ms", deltaT(&t1, &t2)); 770 switch (i - 1) { 771 case ICMP6_DST_UNREACH_NOROUTE: 772 ++unreachable; 773 printf(" !N"); 774 break; 775 case ICMP6_DST_UNREACH_ADMIN: 776 ++unreachable; 777 printf(" !X"); 778 break; 779 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 780 ++unreachable; 781 printf(" !S"); 782 break; 783 case ICMP6_DST_UNREACH_ADDR: 784 ++unreachable; 785 printf(" !H"); 786 break; 787 case ICMP6_DST_UNREACH_NOPORT: 788 if (rcvhlim >= 0 && 789 rcvhlim <= 1) 790 printf(" !"); 791 ++got_there; 792 break; 793 } 794 break; 795 } 796 } 797 if (cc == 0) 798 printf(" *"); 799 (void) fflush(stdout); 800 } 801 putchar('\n'); 802 if (got_there || 803 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 804 exit(0); 805 } 806 } 807 808 if (as_path) 809 as_shutdown(asn); 810 811 exit(0); 812 } 813 814 static ssize_t 815 wait_for_reply(int sock, struct msghdr *mhdr) 816 { 817 #ifdef HAVE_POLL 818 struct pollfd pfd[1]; 819 ssize_t cc = 0; 820 821 pfd[0].fd = sock; 822 pfd[0].events = POLLIN; 823 pfd[0].revents = 0; 824 825 if (poll(pfd, 1, waittime * 1000) > 0) 826 cc = recvmsg(rcvsock, mhdr, 0); 827 828 return cc; 829 #else 830 fd_set *fdsp; 831 struct timeval wait; 832 ssize_t cc = 0; 833 int fdsn; 834 835 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 836 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 837 err(1, "malloc"); 838 memset(fdsp, 0, fdsn); 839 FD_SET(sock, fdsp); 840 wait.tv_sec = waittime; wait.tv_usec = 0; 841 842 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 843 cc = recvmsg(rcvsock, mhdr, 0); 844 845 free(fdsp); 846 return cc; 847 #endif 848 } 849 850 #ifdef IPSEC 851 #ifdef IPSEC_POLICY_IPSEC 852 static int 853 setpolicy(int so, const char *policy) 854 { 855 char *buf; 856 857 buf = ipsec_set_policy(policy, strlen(policy)); 858 if (buf == NULL) { 859 warnx("%s", ipsec_strerror()); 860 return -1; 861 } 862 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 863 buf, ipsec_get_policylen(buf)); 864 865 free(buf); 866 867 return 0; 868 } 869 #endif 870 #endif 871 872 static void 873 send_probe(int seq, u_long hops) 874 { 875 struct timeval tv; 876 struct tv32 tv32; 877 int i; 878 879 i = hops; 880 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 881 (char *)&i, sizeof(i)) < 0) 882 warn("setsockopt IPV6_UNICAST_HOPS"); 883 884 Dst.sin6_port = htons(port + seq); 885 (void) gettimeofday(&tv, NULL); 886 tv32.tv32_sec = htonl(tv.tv_sec); 887 tv32.tv32_usec = htonl(tv.tv_usec); 888 889 if (useicmp) { 890 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 891 892 icp->icmp6_type = ICMP6_ECHO_REQUEST; 893 icp->icmp6_code = 0; 894 icp->icmp6_cksum = 0; 895 icp->icmp6_id = ident; 896 icp->icmp6_seq = htons(seq); 897 memcpy(((u_int8_t *)outpacket + ICMP6ECHOLEN), &tv32, 898 sizeof(tv32)); 899 } else { 900 struct opacket *op = outpacket; 901 902 op->seq = seq; 903 op->hops = hops; 904 memcpy(&op->tv, &tv32, sizeof tv32); 905 } 906 907 i = sendto(sndsock, (char *)outpacket, datalen , 0, 908 (struct sockaddr *)&Dst, Dst.sin6_len); 909 if (i < 0 || i != (int)datalen) { 910 if (i < 0) 911 warnx("sendto"); 912 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 913 hostname, datalen, i); 914 (void) fflush(stdout); 915 } 916 } 917 918 #if 0 919 static int 920 get_hoplim(struct msghdr *mhdr) 921 { 922 struct cmsghdr *cm; 923 924 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 925 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 926 if (cm->cmsg_level == IPPROTO_IPV6 && 927 cm->cmsg_type == IPV6_HOPLIMIT && 928 cm->cmsg_len == CMSG_LEN(sizeof(int))) 929 return *(int *)CMSG_DATA(cm); 930 } 931 932 return -1; 933 } 934 #endif 935 936 static double 937 deltaT(struct timeval *t1p, struct timeval *t2p) 938 { 939 double dt; 940 941 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 942 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 943 return dt; 944 } 945 946 /* 947 * Convert an ICMP "type" field to a printable string. 948 */ 949 static const char * 950 pr_type(int t0) 951 { 952 u_char t = t0 & 0xff; 953 const char *cp; 954 955 switch (t) { 956 case ICMP6_DST_UNREACH: 957 cp = "Destination Unreachable"; 958 break; 959 case ICMP6_PACKET_TOO_BIG: 960 cp = "Packet Too Big"; 961 break; 962 case ICMP6_TIME_EXCEEDED: 963 cp = "Time Exceeded"; 964 break; 965 case ICMP6_PARAM_PROB: 966 cp = "Parameter Problem"; 967 break; 968 case ICMP6_ECHO_REQUEST: 969 cp = "Echo Request"; 970 break; 971 case ICMP6_ECHO_REPLY: 972 cp = "Echo Reply"; 973 break; 974 case ICMP6_MEMBERSHIP_QUERY: 975 cp = "Group Membership Query"; 976 break; 977 case ICMP6_MEMBERSHIP_REPORT: 978 cp = "Group Membership Report"; 979 break; 980 case ICMP6_MEMBERSHIP_REDUCTION: 981 cp = "Group Membership Reduction"; 982 break; 983 case ND_ROUTER_SOLICIT: 984 cp = "Router Solicitation"; 985 break; 986 case ND_ROUTER_ADVERT: 987 cp = "Router Advertisement"; 988 break; 989 case ND_NEIGHBOR_SOLICIT: 990 cp = "Neighbor Solicitation"; 991 break; 992 case ND_NEIGHBOR_ADVERT: 993 cp = "Neighbor Advertisement"; 994 break; 995 case ND_REDIRECT: 996 cp = "Redirect"; 997 break; 998 default: 999 cp = "Unknown"; 1000 break; 1001 } 1002 return cp; 1003 } 1004 1005 static int 1006 packet_ok(struct msghdr *mhdr, ssize_t cc, int seq) 1007 { 1008 struct icmp6_hdr *icp; 1009 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1010 u_char type, code; 1011 char *buf = (char *)mhdr->msg_iov[0].iov_base; 1012 struct cmsghdr *cm; 1013 int *hlimp; 1014 char hbuf[NI_MAXHOST]; 1015 1016 #ifdef OLDRAWSOCKET 1017 int hlen; 1018 struct ip6_hdr *ip; 1019 #endif 1020 1021 #ifdef OLDRAWSOCKET 1022 ip = (struct ip6_hdr *) buf; 1023 hlen = sizeof(struct ip6_hdr); 1024 if (cc < hlen + sizeof(struct icmp6_hdr)) { 1025 if (verbose) { 1026 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1027 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1028 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1029 printf("packet too short (%d bytes) from %s\n", cc, 1030 hbuf); 1031 } 1032 return 0; 1033 } 1034 cc -= hlen; 1035 icp = (struct icmp6_hdr *)(buf + hlen); 1036 #else 1037 if (cc < (ssize_t)sizeof(struct icmp6_hdr)) { 1038 if (verbose) { 1039 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1040 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1041 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1042 printf("data too short (%zd bytes) from %s\n", cc, 1043 hbuf); 1044 } 1045 return 0; 1046 } 1047 icp = (struct icmp6_hdr *)buf; 1048 #endif 1049 /* get optional information via advanced API */ 1050 rcvpktinfo = NULL; 1051 hlimp = NULL; 1052 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1053 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1054 if (cm->cmsg_level == IPPROTO_IPV6 && 1055 cm->cmsg_type == IPV6_PKTINFO && 1056 cm->cmsg_len == 1057 CMSG_LEN(sizeof(struct in6_pktinfo))) 1058 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1059 1060 if (cm->cmsg_level == IPPROTO_IPV6 && 1061 cm->cmsg_type == IPV6_HOPLIMIT && 1062 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1063 hlimp = (int *)CMSG_DATA(cm); 1064 } 1065 if (rcvpktinfo == NULL || hlimp == NULL) { 1066 warnx("failed to get received hop limit or packet info"); 1067 #if 0 1068 return 0; 1069 #else 1070 rcvhlim = 0; /*XXX*/ 1071 #endif 1072 } 1073 else 1074 rcvhlim = *hlimp; 1075 1076 type = icp->icmp6_type; 1077 code = icp->icmp6_code; 1078 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1079 || type == ICMP6_DST_UNREACH) { 1080 struct ip6_hdr *hip; 1081 struct udphdr *up; 1082 1083 hip = (struct ip6_hdr *)(icp + 1); 1084 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1085 if (verbose) 1086 warnx("failed to get upper layer header"); 1087 return 0; 1088 } 1089 if (useicmp && 1090 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1091 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1092 return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1; 1093 else if (!useicmp && 1094 up->uh_sport == htons(srcport) && 1095 up->uh_dport == htons(port + seq)) 1096 return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1; 1097 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1098 if (icp->icmp6_id == ident && 1099 icp->icmp6_seq == htons(seq)) 1100 return ICMP6_DST_UNREACH_NOPORT + 1; 1101 } 1102 if (verbose) { 1103 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1104 u_int8_t *p; 1105 ssize_t i; 1106 1107 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1108 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1109 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1110 printf("\n%zd bytes from %s to %s", cc, sbuf, 1111 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1112 dbuf, sizeof(dbuf)) : "?"); 1113 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1114 icp->icmp6_code); 1115 p = (u_int8_t *)(icp + 1); 1116 #define WIDTH 16 1117 for (i = 0; i < cc; i++) { 1118 if (i % WIDTH == 0) 1119 printf("%04zx:", i); 1120 if (i % 4 == 0) 1121 printf(" "); 1122 printf("%02x", p[i]); 1123 if (i % WIDTH == WIDTH - 1) 1124 printf("\n"); 1125 } 1126 if (cc % WIDTH != 0) 1127 printf("\n"); 1128 } 1129 return 0; 1130 } 1131 1132 /* 1133 * Increment pointer until find the UDP or ICMP header. 1134 */ 1135 static struct udphdr * 1136 get_udphdr(struct ip6_hdr *ip6, u_char *lim) 1137 { 1138 u_char *cp = (u_char *)ip6, nh; 1139 int hlen; 1140 1141 if (cp + sizeof(*ip6) >= lim) 1142 return NULL; 1143 1144 nh = ip6->ip6_nxt; 1145 cp += sizeof(struct ip6_hdr); 1146 1147 while (lim - cp >= 8) { 1148 switch (nh) { 1149 case IPPROTO_ESP: 1150 case IPPROTO_TCP: 1151 return NULL; 1152 case IPPROTO_ICMPV6: 1153 return useicmp ? (struct udphdr *)cp : NULL; 1154 case IPPROTO_UDP: 1155 return useicmp ? NULL : (struct udphdr *)cp; 1156 case IPPROTO_FRAGMENT: 1157 hlen = sizeof(struct ip6_frag); 1158 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1159 break; 1160 case IPPROTO_AH: 1161 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1162 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1163 break; 1164 default: 1165 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1166 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1167 break; 1168 } 1169 1170 cp += hlen; 1171 } 1172 1173 return NULL; 1174 } 1175 1176 static void 1177 print(struct msghdr *mhdr, int cc) 1178 { 1179 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1180 char hbuf[NI_MAXHOST]; 1181 1182 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1183 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1184 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1185 if (as_path) 1186 printf(" [AS%u]", as_lookup(asn, hbuf, AF_INET6)); 1187 if (nflag) 1188 printf(" %s", hbuf); 1189 else if (lflag) 1190 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1191 else 1192 printf(" %s", inetname((struct sockaddr *)from)); 1193 1194 if (verbose) { 1195 #ifdef OLDRAWSOCKET 1196 printf(" %d bytes to %s", cc, 1197 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1198 hbuf, sizeof(hbuf)) : "?"); 1199 #else 1200 printf(" %d bytes of data to %s", cc, 1201 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1202 hbuf, sizeof(hbuf)) : "?"); 1203 #endif 1204 } 1205 } 1206 1207 /* 1208 * Construct an Internet address representation. 1209 * If the nflag has been supplied, give 1210 * numeric value, otherwise try for symbolic name. 1211 */ 1212 static const char * 1213 inetname(struct sockaddr *sa) 1214 { 1215 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1216 static int first = 1; 1217 char *cp; 1218 1219 if (first && !nflag) { 1220 first = 0; 1221 if (gethostname(domain, sizeof(domain)) == 0 && 1222 (cp = strchr(domain, '.'))) 1223 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1224 else 1225 domain[0] = 0; 1226 } 1227 cp = NULL; 1228 if (!nflag) { 1229 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1230 NI_NAMEREQD) == 0) { 1231 if ((cp = strchr(line, '.')) && 1232 !strcmp(cp + 1, domain)) 1233 *cp = 0; 1234 cp = line; 1235 } 1236 } 1237 if (cp) 1238 return cp; 1239 1240 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1241 NI_NUMERICHOST) != 0) 1242 strlcpy(line, "invalid", sizeof(line)); 1243 return line; 1244 } 1245 1246 static void 1247 usage(void) 1248 { 1249 1250 fprintf(stderr, 1251 "Usage: %s [-adIlnrv] [-A as_server] [-f firsthop] [-m hoplimit]\n" 1252 "\t[-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n", 1253 getprogname()); 1254 exit(1); 1255 } 1256
Indexes created Wed Oct 22 06:10:02 GMT 2025