traceroute6.c revision 1.7
1 /* $NetBSD: traceroute6.c,v 1.7 2000/02/16 00:38:14 itojun Exp $ */ 2 3 /* 4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the project nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 /*- 33 * Copyright (c) 1990, 1993 34 * The Regents of the University of California. All rights reserved. 35 * 36 * This code is derived from software contributed to Berkeley by 37 * Van Jacobson. 38 * 39 * Redistribution and use in source and binary forms, with or without 40 * modification, are permitted provided that the following conditions 41 * are met: 42 * 1. Redistributions of source code must retain the above copyright 43 * notice, this list of conditions and the following disclaimer. 44 * 2. Redistributions in binary form must reproduce the above copyright 45 * notice, this list of conditions and the following disclaimer in the 46 * documentation and/or other materials provided with the distribution. 47 * 3. All advertising materials mentioning features or use of this software 48 * must display the following acknowledgement: 49 * This product includes software developed by the University of 50 * California, Berkeley and its contributors. 51 * 4. Neither the name of the University nor the names of its contributors 52 * may be used to endorse or promote products derived from this software 53 * without specific prior written permission. 54 * 55 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 56 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 57 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 58 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 59 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 60 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 61 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 62 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 63 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 64 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 65 * SUCH DAMAGE. 66 */ 67 68 #if 0 69 #ifndef lint 70 static char copyright[] = 71 "@(#) Copyright (c) 1990, 1993\n\ 72 The Regents of the University of California. All rights reserved.\n"; 73 #endif /* not lint */ 74 75 #ifndef lint 76 static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93"; 77 #endif /* not lint */ 78 #else 79 #include <sys/cdefs.h> 80 #ifndef lint 81 __RCSID("$NetBSD: traceroute6.c,v 1.7 2000/02/16 00:38:14 itojun Exp $"); 82 #endif 83 #endif 84 85 /* 86 * traceroute host - trace the route ip packets follow going to "host". 87 * 88 * Attempt to trace the route an ip packet would follow to some 89 * internet host. We find out intermediate hops by launching probe 90 * packets with a small ttl (time to live) then listening for an 91 * icmp "time exceeded" reply from a gateway. We start our probes 92 * with a ttl of one and increase by one until we get an icmp "port 93 * unreachable" (which means we got to "host") or hit a max (which 94 * defaults to 30 hops & can be changed with the -m flag). Three 95 * probes (change with -q flag) are sent at each ttl setting and a 96 * line is printed showing the ttl, address of the gateway and 97 * round trip time of each probe. If the probe answers come from 98 * different gateways, the address of each responding system will 99 * be printed. If there is no response within a 5 sec. timeout 100 * interval (changed with the -w flag), a "*" is printed for that 101 * probe. 102 * 103 * Probe packets are UDP format. We don't want the destination 104 * host to process them so the destination port is set to an 105 * unlikely value (if some clod on the destination is using that 106 * value, it can be changed with the -p flag). 107 * 108 * A sample use might be: 109 * 110 * [yak 71]% traceroute nis.nsf.net. 111 * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet 112 * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms 113 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 114 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms 115 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms 116 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms 117 * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms 118 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms 119 * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms 120 * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms 121 * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms 122 * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms 123 * 124 * Note that lines 2 & 3 are the same. This is due to a buggy 125 * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards 126 * packets with a zero ttl. 127 * 128 * A more interesting example is: 129 * 130 * [yak 72]% traceroute allspice.lcs.mit.edu. 131 * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max 132 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 133 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms 134 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms 135 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms 136 * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms 137 * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms 138 * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms 139 * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms 140 * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms 141 * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms 142 * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms 143 * 12 * * * 144 * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms 145 * 14 * * * 146 * 15 * * * 147 * 16 * * * 148 * 17 * * * 149 * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms 150 * 151 * (I start to see why I'm having so much trouble with mail to 152 * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away 153 * either don't send ICMP "time exceeded" messages or send them 154 * with a ttl too small to reach us. 14 - 17 are running the 155 * MIT C Gateway code that doesn't send "time exceeded"s. God 156 * only knows what's going on with 12. 157 * 158 * The silent gateway 12 in the above may be the result of a bug in 159 * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) 160 * sends an unreachable message using whatever ttl remains in the 161 * original datagram. Since, for gateways, the remaining ttl is 162 * zero, the icmp "time exceeded" is guaranteed to not make it back 163 * to us. The behavior of this bug is slightly more interesting 164 * when it appears on the destination system: 165 * 166 * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms 167 * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms 168 * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms 169 * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms 170 * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms 171 * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms 172 * 7 * * * 173 * 8 * * * 174 * 9 * * * 175 * 10 * * * 176 * 11 * * * 177 * 12 * * * 178 * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! 179 * 180 * Notice that there are 12 "gateways" (13 is the final 181 * destination) and exactly the last half of them are "missing". 182 * What's really happening is that rip (a Sun-3 running Sun OS3.5) 183 * is using the ttl from our arriving datagram as the ttl in its 184 * icmp reply. So, the reply will time out on the return path 185 * (with no notice sent to anyone since icmp's aren't sent for 186 * icmp's) until we probe with a ttl that's at least twice the path 187 * length. I.e., rip is really only 7 hops away. A reply that 188 * returns with a ttl of 1 is a clue this problem exists. 189 * Traceroute prints a "!" after the time if the ttl is <= 1. 190 * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or 191 * non-standard (HPUX) software, expect to see this problem 192 * frequently and/or take care picking the target host of your 193 * probes. 194 * 195 * Other possible annotations after the time are !H, !N, !P (got a host, 196 * network or protocol unreachable, respectively), !S or !F (source 197 * route failed or fragmentation needed -- neither of these should 198 * ever occur and the associated gateway is busted if you see one). If 199 * almost all the probes result in some kind of unreachable, traceroute 200 * will give up and exit. 201 * 202 * Notes 203 * ----- 204 * This program must be run by root or be setuid. (I suggest that 205 * you *don't* make it setuid -- casual use could result in a lot 206 * of unnecessary traffic on our poor, congested nets.) 207 * 208 * This program requires a kernel mod that does not appear in any 209 * system available from Berkeley: A raw ip socket using proto 210 * IPPROTO_RAW must interpret the data sent as an ip datagram (as 211 * opposed to data to be wrapped in a ip datagram). See the README 212 * file that came with the source to this program for a description 213 * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may 214 * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE 215 * MODIFIED TO RUN THIS PROGRAM. 216 * 217 * The udp port usage may appear bizarre (well, ok, it is bizarre). 218 * The problem is that an icmp message only contains 8 bytes of 219 * data from the original datagram. 8 bytes is the size of a udp 220 * header so, if we want to associate replies with the original 221 * datagram, the necessary information must be encoded into the 222 * udp header (the ip id could be used but there's no way to 223 * interlock with the kernel's assignment of ip id's and, anyway, 224 * it would have taken a lot more kernel hacking to allow this 225 * code to set the ip id). So, to allow two or more users to 226 * use traceroute simultaneously, we use this task's pid as the 227 * source port (the high bit is set to move the port number out 228 * of the "likely" range). To keep track of which probe is being 229 * replied to (so times and/or hop counts don't get confused by a 230 * reply that was delayed in transit), we increment the destination 231 * port number before each probe. 232 * 233 * Don't use this as a coding example. I was trying to find a 234 * routing problem and this code sort-of popped out after 48 hours 235 * without sleep. I was amazed it ever compiled, much less ran. 236 * 237 * I stole the idea for this program from Steve Deering. Since 238 * the first release, I've learned that had I attended the right 239 * IETF working group meetings, I also could have stolen it from Guy 240 * Almes or Matt Mathis. I don't know (or care) who came up with 241 * the idea first. I envy the originators' perspicacity and I'm 242 * glad they didn't keep the idea a secret. 243 * 244 * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or 245 * enhancements to the original distribution. 246 * 247 * I've hacked up a round-trip-route version of this that works by 248 * sending a loose-source-routed udp datagram through the destination 249 * back to yourself. Unfortunately, SO many gateways botch source 250 * routing, the thing is almost worthless. Maybe one day... 251 * 252 * -- Van Jacobson (van (at) helios.ee.lbl.gov) 253 * Tue Dec 20 03:50:13 PST 1988 254 */ 255 256 #include <sys/param.h> 257 #include <sys/time.h> 258 #include <sys/socket.h> 259 #include <sys/uio.h> 260 #include <sys/file.h> 261 #include <sys/ioctl.h> 262 263 #include <netinet/in.h> 264 265 #include <arpa/inet.h> 266 267 #include <netdb.h> 268 #include <stdio.h> 269 #include <err.h> 270 #include <errno.h> 271 #include <stdlib.h> 272 #include <string.h> 273 #include <unistd.h> 274 275 #include <netinet/ip6.h> 276 #include <netinet/icmp6.h> 277 #include <netinet/udp.h> 278 279 #ifdef IPSEC 280 #include <net/route.h> 281 #include <netinet6/ipsec.h> 282 #endif 283 284 #define freehostent(hp) 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 /* 306 * format of a (udp) probe packet. 307 */ 308 struct opacket { 309 u_char seq; /* sequence number of this packet */ 310 u_char hops; /* hop limit of the packet */ 311 struct timeval tv; /* time packet left */ 312 }; 313 314 u_char packet[512]; /* last inbound (icmp) packet */ 315 struct opacket *outpacket; /* last output (udp) packet */ 316 317 int main __P((int, char *[])); 318 int wait_for_reply __P((int, struct msghdr *)); 319 #ifdef IPSEC 320 #ifdef IPSEC_POLICY_IPSEC 321 int setpolicy __P((int so, char *policy)); 322 #endif 323 #endif 324 void send_probe __P((int, int)); 325 struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *)); 326 int get_hoplim __P((struct msghdr *)); 327 double deltaT __P((struct timeval *, struct timeval *)); 328 char *pr_type __P((int)); 329 int packet_ok __P((struct msghdr *, int, int)); 330 void print __P((struct msghdr *, int)); 331 void tvsub __P((struct timeval *, struct timeval *)); 332 const char *inetname __P((struct sockaddr *)); 333 void usage __P((void)); 334 335 int rcvsock; /* receive (icmp) socket file descriptor */ 336 int sndsock; /* send (udp) socket file descriptor */ 337 struct timezone tz; /* leftover */ 338 339 struct msghdr rcvmhdr; 340 struct iovec rcviov[2]; 341 int rcvhlim; 342 struct in6_pktinfo *rcvpktinfo; 343 344 struct sockaddr_in6 Src, Dst, Rcv; 345 struct sockaddr_in6 *src = &Src, *rcv = &Rcv; 346 int datalen; /* How much data */ 347 /* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */ 348 char rtbuf[2064]; 349 #ifdef USE_RFC2292BIS 350 struct ip6_rthdr *rth; 351 #endif 352 struct cmsghdr *cmsg; 353 354 char *source = 0; 355 char *hostname; 356 357 int nprobes = 3; 358 int max_hops = 30; 359 u_short ident; 360 u_short port = 32768+666; /* start udp dest port # for probe packets */ 361 int options; /* socket options */ 362 int verbose; 363 int waittime = 5; /* time to wait for response (in seconds) */ 364 int nflag; /* print addresses numerically */ 365 int lflag; /* print both numerical address & hostname */ 366 367 #ifdef KAME_SCOPEID 368 const int niflag = NI_WITHSCOPEID; 369 #else 370 const int niflag = 0; 371 #endif 372 373 int 374 main(argc, argv) 375 int argc; 376 char *argv[]; 377 { 378 struct hostent *hp; 379 int error; 380 struct addrinfo hints, *res; 381 extern char *optarg; 382 extern int optind; 383 int ch, i, on, probe, seq, hops; 384 static u_char rcvcmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo)) 385 + CMSG_SPACE(sizeof(int))]; 386 char hbuf[NI_MAXHOST]; 387 388 on = 1; 389 seq = 0; 390 391 while ((ch = getopt(argc, argv, "dlm:np:q:rs:w:vg:")) != EOF) 392 switch(ch) { 393 case 'd': 394 options |= SO_DEBUG; 395 break; 396 case 'l': 397 lflag++; 398 break; 399 case 'g': 400 #if 0 401 hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno); 402 #else 403 hp = gethostbyname2(optarg, AF_INET6); 404 #endif 405 if (hp == NULL) { 406 Fprintf(stderr, 407 "traceroute6: unknown host %s\n", optarg); 408 exit(1); 409 } 410 #ifdef USE_RFC2292BIS 411 if (rth == NULL) { 412 /* 413 * XXX: We can't detect the number of 414 * intermediate nodes yet. 415 */ 416 if ((rth = inet6_rth_init((void *)rtbuf, 417 sizeof(rtbuf), 418 IPV6_RTHDR_TYPE_0, 419 0)) == NULL) { 420 Fprintf(stderr, 421 "inet6_rth_init failed.\n"); 422 exit(1); 423 } 424 } 425 if (inet6_rth_add((void *)rth, 426 (struct in6_addr *)hp->h_addr)) { 427 Fprintf(stderr, 428 "inet6_rth_add failed for %s\n", 429 optarg); 430 exit(1); 431 } 432 #else /* old advanced API */ 433 if (cmsg == NULL) 434 cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0); 435 inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE); 436 #endif 437 freehostent(hp); 438 break; 439 case 'm': 440 max_hops = atoi(optarg); 441 if (max_hops <= 1) { 442 Fprintf(stderr, 443 "traceroute6: max hoplimit must be >1.\n"); 444 exit(1); 445 } 446 break; 447 case 'n': 448 nflag++; 449 break; 450 case 'p': 451 port = atoi(optarg); 452 if (port < 1) { 453 Fprintf(stderr, 454 "traceroute6: port must be >0.\n"); 455 exit(1); 456 } 457 break; 458 case 'q': 459 nprobes = atoi(optarg); 460 if (nprobes < 1) { 461 Fprintf(stderr, 462 "traceroute6: nprobes must be >0.\n"); 463 exit(1); 464 } 465 break; 466 case 'r': 467 options |= SO_DONTROUTE; 468 break; 469 case 's': 470 /* 471 * set the ip source address of the outbound 472 * probe (e.g., on a multi-homed host). 473 */ 474 source = optarg; 475 break; 476 case 'v': 477 verbose++; 478 break; 479 case 'w': 480 waittime = atoi(optarg); 481 if (waittime <= 1) { 482 Fprintf(stderr, 483 "traceroute6: wait must be >1 sec.\n"); 484 exit(1); 485 } 486 break; 487 default: 488 usage(); 489 } 490 argc -= optind; 491 argv += optind; 492 493 if (argc < 1) 494 usage(); 495 496 #if 1 497 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 498 #else 499 setlinebuf (stdout); 500 #endif 501 502 memset(&hints, 0, sizeof(hints)); 503 hints.ai_family = PF_INET6; 504 hints.ai_socktype = SOCK_RAW; 505 hints.ai_protocol = IPPROTO_ICMPV6; 506 hints.ai_flags = AI_CANONNAME; 507 error = getaddrinfo(*argv, NULL, &hints, &res); 508 if (error) { 509 (void)fprintf(stderr, 510 "traceroute6: %s\n", gai_strerror(error)); 511 exit(1); 512 } 513 if (res->ai_addrlen != sizeof(Dst)) { 514 (void)fprintf(stderr, 515 "traceroute6: size of sockaddr mismatch\n"); 516 exit(1); 517 } 518 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 519 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 520 521 if (*++argv) 522 datalen = atoi(*argv); 523 if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) { 524 Fprintf(stderr, 525 "traceroute6: packet size must be 0 <= s < %ld.\n", 526 (long)(MAXPACKET - sizeof(struct opacket))); 527 exit(1); 528 } 529 datalen += sizeof(struct opacket); 530 outpacket = (struct opacket *)malloc((unsigned)datalen); 531 if (! outpacket) { 532 perror("traceroute6: malloc"); 533 exit(1); 534 } 535 (void) bzero((char *)outpacket, datalen); 536 537 /* 538 * Receive ICMP 539 */ 540 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) { 541 perror("traceroute6: icmp socket"); 542 exit(5); 543 } 544 /* initialize msghdr for receiving packets */ 545 rcviov[0].iov_base = (caddr_t)packet; 546 rcviov[0].iov_len = sizeof(packet); 547 rcvmhdr.msg_name = (caddr_t)rcv; 548 rcvmhdr.msg_namelen = sizeof(*rcv); 549 rcvmhdr.msg_iov = rcviov; 550 rcvmhdr.msg_iovlen = 1; 551 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 552 rcvmhdr.msg_controllen = sizeof(rcvcmsgbuf); 553 554 /* specify to tell receiving interface */ 555 #ifdef IPV6_RECVPKTINFO 556 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 557 sizeof(on)) < 0) 558 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 559 #else /* old adv. API */ 560 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on, 561 sizeof(on)) < 0) 562 err(1, "setsockopt(IPV6_PKTINFO)"); 563 #endif 564 565 /* specify to tell value of hoplimit field of received IP6 hdr */ 566 #ifdef IPV6_RECVHOPLIMIT 567 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 568 sizeof(on)) < 0) 569 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 570 #else /* old adv. API */ 571 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on, 572 sizeof(on)) < 0) 573 err(1, "setsockopt(IPV6_HOPLIMIT)"); 574 #endif 575 576 if (options & SO_DEBUG) 577 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 578 (char *)&on, sizeof(on)); 579 if (options & SO_DONTROUTE) 580 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 581 (char *)&on, sizeof(on)); 582 #ifdef IPSEC 583 #ifdef IPSEC_POLICY_IPSEC 584 /* 585 * do not raise error even if setsockopt fails, kernel may have ipsec 586 * turned off. 587 */ 588 if (setpolicy(rcvsock, "in bypass") < 0) 589 errx(1, ipsec_strerror()); 590 if (setpolicy(rcvsock, "out bypass") < 0) 591 errx(1, ipsec_strerror()); 592 #else 593 { 594 int level = IPSEC_LEVEL_NONE; 595 596 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 597 sizeof(level)); 598 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 599 sizeof(level)); 600 #ifdef IP_AUTH_TRANS_LEVEL 601 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 602 sizeof(level)); 603 #else 604 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 605 sizeof(level)); 606 #endif 607 #ifdef IP_AUTH_NETWORK_LEVEL 608 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 609 sizeof(level)); 610 #endif 611 } 612 #endif /*IPSEC_POLICY_IPSEC*/ 613 #endif /*IPSEC*/ 614 615 /* 616 * Send UDP 617 */ 618 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 619 perror("traceroute6: udp socket"); 620 exit(5); 621 } 622 #ifdef SO_SNDBUF 623 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, 624 sizeof(datalen)) < 0) { 625 perror("traceroute6: SO_SNDBUF"); 626 exit(6); 627 } 628 #endif /* SO_SNDBUF */ 629 if (options & SO_DEBUG) 630 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 631 (char *)&on, sizeof(on)); 632 if (options & SO_DONTROUTE) 633 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 634 (char *)&on, sizeof(on)); 635 #ifdef USE_RFC2292BIS 636 if (rth) {/* XXX: there is no library to finalize the header... */ 637 rth->ip6r_len = rth->ip6r_segleft * 2; 638 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR, 639 (void *)rth, (rth->ip6r_len + 1) << 3)) { 640 Fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n", 641 strerror(errno)); 642 exit(1); 643 } 644 } 645 #else /* old advanced API */ 646 if (cmsg != NULL) { 647 inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE); 648 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS, 649 rtbuf, cmsg->cmsg_len) < 0) { 650 Fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n", 651 strerror(errno)); 652 exit(1); 653 } 654 } 655 #endif /* USE_RFC2292BIS */ 656 #ifdef IPSEC 657 #ifdef IPSEC_POLICY_IPSEC 658 /* 659 * do not raise error even if setsockopt fails, kernel may have ipsec 660 * turned off. 661 */ 662 if (setpolicy(sndsock, "in bypass") < 0) 663 errx(1, ipsec_strerror()); 664 if (setpolicy(sndsock, "out bypass") < 0) 665 errx(1, ipsec_strerror()); 666 #else 667 { 668 int level = IPSEC_LEVEL_BYPASS; 669 670 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 671 sizeof(level)); 672 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 673 sizeof(level)); 674 #ifdef IP_AUTH_TRANS_LEVEL 675 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 676 sizeof(level)); 677 #else 678 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 679 sizeof(level)); 680 #endif 681 #ifdef IP_AUTH_NETWORK_LEVEL 682 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 683 sizeof(level)); 684 #endif 685 } 686 #endif /*IPSEC_POLICY_IPSEC*/ 687 #endif /*IPSEC*/ 688 689 /* 690 * Source selection 691 */ 692 bzero((char *)src, sizeof(Src)); 693 if (source) { 694 if (inet_pton(AF_INET6, source, &Src.sin6_addr) != 1) { 695 Printf("traceroute6: unknown host %s\n", source); 696 exit(1); 697 } 698 } else { 699 struct sockaddr_in6 Nxt; 700 int dummy, len; 701 702 len = sizeof(Src); 703 Nxt = Dst; 704 Nxt.sin6_port = htons(DUMMY_PORT); 705 if (cmsg != NULL) 706 bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr, 707 sizeof(Nxt.sin6_addr)); 708 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 709 perror("socket") ; 710 } 711 if(-1 == connect(dummy, (struct sockaddr *)&Nxt, sizeof(Nxt))) 712 perror("connect"); 713 if(-1 == getsockname(dummy, (struct sockaddr *)src, &len)) { 714 perror("getsockname"); 715 printf("%d\n", errno); 716 } 717 close(dummy) ; 718 } 719 ident = (getpid() & 0xffff) | 0x8000; 720 Src.sin6_family = AF_INET6; 721 Src.sin6_port = htons(ident); 722 if (bind(sndsock, (struct sockaddr *)src, sizeof(Src)) < 0){ 723 perror ("traceroute6: bind:"); 724 exit (1); 725 } 726 727 /* 728 * Message to users 729 */ 730 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 731 sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag)) 732 strcpy(hbuf, "(invalid)"); 733 Fprintf(stderr, "traceroute to %s (%s)", hostname, hbuf); 734 if (source) 735 Fprintf(stderr, " from %s", source); 736 Fprintf(stderr, ", %d hops max, %d byte packets\n", max_hops, datalen); 737 (void) fflush(stderr); 738 739 /* 740 * Main loop 741 */ 742 for (hops = 1; hops <= max_hops; ++hops) { 743 struct in6_addr lastaddr; 744 int got_there = 0; 745 int unreachable = 0; 746 747 Printf("%2d ", hops); 748 bzero(&lastaddr, sizeof(lastaddr)); 749 for (probe = 0; probe < nprobes; ++probe) { 750 int cc; 751 struct timeval t1, t2; 752 struct timezone tz; 753 754 (void) gettimeofday(&t1, &tz); 755 send_probe(++seq, hops); 756 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 757 (void) gettimeofday(&t2, &tz); 758 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 759 if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 760 &lastaddr)) { 761 print(&rcvmhdr, cc); 762 lastaddr = Rcv.sin6_addr; 763 } 764 Printf(" %g ms", deltaT(&t1, &t2)); 765 switch(i - 1) { 766 case ICMP6_DST_UNREACH_NOROUTE: 767 ++unreachable; 768 Printf(" !N"); 769 break; 770 case ICMP6_DST_UNREACH_ADMIN: 771 ++unreachable; 772 Printf(" !P"); 773 break; 774 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 775 ++unreachable; 776 Printf(" !S"); 777 break; 778 case ICMP6_DST_UNREACH_ADDR: 779 ++unreachable; 780 Printf(" !A"); 781 break; 782 case ICMP6_DST_UNREACH_NOPORT: 783 if (rcvhlim >= 0 && 784 rcvhlim <= 1) 785 Printf(" !"); 786 ++got_there; 787 break; 788 } 789 break; 790 } 791 } 792 if (cc == 0) 793 Printf(" *"); 794 (void) fflush(stdout); 795 } 796 putchar('\n'); 797 if (got_there || 798 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 799 exit(0); 800 } 801 } 802 803 exit(0); 804 } 805 806 int 807 wait_for_reply(sock, mhdr) 808 int sock; 809 struct msghdr *mhdr; 810 { 811 fd_set fds; 812 struct timeval wait; 813 int cc = 0; 814 815 FD_ZERO(&fds); 816 FD_SET(sock, &fds); 817 wait.tv_sec = waittime; wait.tv_usec = 0; 818 819 if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0) 820 cc = recvmsg(rcvsock, mhdr, 0); 821 822 return(cc); 823 } 824 825 #ifdef IPSEC 826 #ifdef IPSEC_POLICY_IPSEC 827 int 828 setpolicy(so, policy) 829 int so; 830 char *policy; 831 { 832 char *buf; 833 834 buf = ipsec_set_policy(policy, strlen(policy)); 835 if (buf == NULL) { 836 warnx(ipsec_strerror()); 837 return -1; 838 } 839 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 840 buf, ipsec_get_policylen(buf)); 841 842 free(buf); 843 844 return 0; 845 } 846 #endif 847 #endif 848 849 void 850 send_probe(seq, hops) 851 int seq, hops; 852 { 853 struct opacket *op = outpacket; 854 int i; 855 856 if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 857 (char *)&hops, sizeof(hops)) < 0) { 858 perror("setsockopt IPV6_UNICAST_HOPS"); 859 } 860 861 Dst.sin6_port = htons(port + seq); 862 863 op->seq = seq; 864 op->hops = hops; 865 (void) gettimeofday(&op->tv, &tz); 866 867 i = sendto(sndsock, (char *)outpacket, datalen , 0, 868 (struct sockaddr *)&Dst, Dst.sin6_len); 869 if (i < 0 || i != datalen) { 870 if (i<0) 871 perror("sendto"); 872 Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname, 873 datalen, i); 874 (void) fflush(stdout); 875 } 876 } 877 878 int 879 get_hoplim(mhdr) 880 struct msghdr *mhdr; 881 { 882 struct cmsghdr *cm; 883 884 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 885 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 886 if (cm->cmsg_level == IPPROTO_IPV6 && 887 cm->cmsg_type == IPV6_HOPLIMIT && 888 cm->cmsg_len == CMSG_LEN(sizeof(int))) 889 return(*(int *)CMSG_DATA(cm)); 890 } 891 892 return(-1); 893 } 894 895 double 896 deltaT(t1p, t2p) 897 struct timeval *t1p, *t2p; 898 { 899 register double dt; 900 901 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 902 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 903 return (dt); 904 } 905 906 907 /* 908 * Convert an ICMP "type" field to a printable string. 909 */ 910 char * 911 pr_type(t0) 912 int t0; 913 { 914 u_char t = t0 & 0xff; 915 char *cp; 916 917 switch (t) { 918 case ICMP6_DST_UNREACH: 919 cp = "Destination Unreachable"; 920 break; 921 case ICMP6_PACKET_TOO_BIG: 922 cp = "Pakcet Too Big"; 923 break; 924 case ICMP6_TIME_EXCEEDED: 925 cp = "Time Exceeded"; 926 break; 927 case ICMP6_PARAM_PROB: 928 cp = "Parameter Problem"; 929 break; 930 case ICMP6_ECHO_REQUEST: 931 cp = "Echo Request"; 932 break; 933 case ICMP6_ECHO_REPLY: 934 cp = "Echo Reply"; 935 break; 936 case ICMP6_MEMBERSHIP_QUERY: 937 cp = "Group Membership Query"; 938 break; 939 case ICMP6_MEMBERSHIP_REPORT: 940 cp = "Group Membership Report"; 941 break; 942 case ICMP6_MEMBERSHIP_REDUCTION: 943 cp = "Group Membership Reduction"; 944 break; 945 case ND_ROUTER_SOLICIT: 946 cp = "Router Solicitation"; 947 break; 948 case ND_ROUTER_ADVERT: 949 cp = "Router Advertisement"; 950 break; 951 case ND_NEIGHBOR_SOLICIT: 952 cp = "Neighbor Solicitation"; 953 break; 954 case ND_NEIGHBOR_ADVERT: 955 cp = "Neighbor Advertisement"; 956 break; 957 case ND_REDIRECT: 958 cp = "Ridirect"; 959 break; 960 default: 961 cp = "Unknown"; 962 break; 963 } 964 return cp; 965 } 966 967 968 int 969 packet_ok(mhdr, cc, seq) 970 struct msghdr *mhdr; 971 int cc; 972 int seq; 973 { 974 register struct icmp6_hdr *icp; 975 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 976 u_char type, code; 977 char *buf = (char *)mhdr->msg_iov[0].iov_base; 978 struct cmsghdr *cm; 979 int *hlimp; 980 char hbuf[NI_MAXHOST]; 981 982 #ifdef OLDRAWSOCKET 983 int hlen; 984 struct ip6_hdr *ip; 985 #endif 986 987 #ifdef OLDRAWSOCKET 988 ip = (struct ip6_hdr *) buf; 989 hlen = sizeof(struct ip6_hdr); 990 if (cc < hlen + sizeof(struct icmp6_hdr)) { 991 if (verbose) { 992 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 993 hbuf, sizeof(hbuf), NULL, 0, 994 NI_NUMERICHOST | niflag) != 0) 995 strcpy(hbuf, "invalid"); 996 Printf("packet too short (%d bytes) from %s\n", cc, 997 hbuf); 998 } 999 return (0); 1000 } 1001 cc -= hlen; 1002 icp = (struct icmp6_hdr *)(buf + hlen); 1003 #else 1004 if (cc < sizeof(struct icmp6_hdr)) { 1005 if (verbose) { 1006 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1007 hbuf, sizeof(hbuf), NULL, 0, 1008 NI_NUMERICHOST | niflag) != 0) 1009 strcpy(hbuf, "invalid"); 1010 Printf("data too short (%d bytes) from %s\n", cc, hbuf); 1011 } 1012 return(0); 1013 } 1014 icp = (struct icmp6_hdr *)buf; 1015 #endif 1016 /* get optional information via advanced API */ 1017 rcvpktinfo = NULL; 1018 hlimp = NULL; 1019 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 1020 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1021 if (cm->cmsg_level == IPPROTO_IPV6 && 1022 cm->cmsg_type == IPV6_PKTINFO && 1023 cm->cmsg_len == 1024 CMSG_LEN(sizeof(struct in6_pktinfo))) 1025 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1026 1027 if (cm->cmsg_level == IPPROTO_IPV6 && 1028 cm->cmsg_type == IPV6_HOPLIMIT && 1029 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1030 hlimp = (int *)CMSG_DATA(cm); 1031 } 1032 if (rcvpktinfo == NULL || hlimp == NULL) { 1033 warnx("failed to get received hop limit or packet info"); 1034 return(0); 1035 } 1036 rcvhlim = *hlimp; 1037 1038 type = icp->icmp6_type; 1039 code = icp->icmp6_code; 1040 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1041 || type == ICMP6_DST_UNREACH) { 1042 struct ip6_hdr *hip; 1043 struct udphdr *up; 1044 1045 hip = (struct ip6_hdr *)(icp + 1); 1046 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1047 if (verbose) 1048 warnx("failed to get upper layer header"); 1049 return(0); 1050 } 1051 if (up->uh_sport == htons(ident) && 1052 up->uh_dport == htons(port+seq)) 1053 return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1); 1054 } 1055 if (verbose) { 1056 int i; 1057 u_long *lp = (u_long *)(icp + 1); 1058 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1059 1060 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1061 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1062 strcpy(sbuf, "invalid"); 1063 Printf("\n%d bytes from %s to %s", cc, sbuf, 1064 inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1065 dbuf, sizeof(dbuf))); 1066 Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1067 icp->icmp6_code); 1068 for (i = 4; i < cc ; i += sizeof(long)) 1069 Printf("%2d: %8.8x\n", i, (u_int32_t)ntohl(*lp++)); 1070 } 1071 return(0); 1072 } 1073 1074 /* 1075 * Increment pointer until find the UDP header. 1076 */ 1077 struct udphdr * 1078 get_udphdr(ip6, lim) 1079 struct ip6_hdr *ip6; 1080 u_char *lim; 1081 { 1082 u_char *cp = (u_char *)ip6, nh; 1083 int hlen; 1084 1085 if (cp + sizeof(*ip6) >= lim) 1086 return(NULL); 1087 1088 nh = ip6->ip6_nxt; 1089 cp += sizeof(struct ip6_hdr); 1090 1091 while(lim - cp >= 8) { 1092 switch(nh) { 1093 case IPPROTO_ESP: 1094 case IPPROTO_TCP: 1095 case IPPROTO_ICMPV6: 1096 return(NULL); 1097 case IPPROTO_UDP: 1098 return((struct udphdr *)cp); 1099 case IPPROTO_FRAGMENT: 1100 hlen = sizeof(struct ip6_frag); 1101 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1102 break; 1103 case IPPROTO_AH: 1104 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1105 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1106 break; 1107 default: 1108 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1109 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1110 break; 1111 } 1112 1113 cp += hlen; 1114 } 1115 1116 return(NULL); 1117 } 1118 1119 void 1120 print(mhdr, cc) 1121 struct msghdr *mhdr; 1122 int cc; 1123 { 1124 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1125 char hbuf[NI_MAXHOST]; 1126 1127 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1128 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST | niflag) != 0) 1129 strcpy(hbuf, "invalid"); 1130 if (nflag) 1131 Printf(" %s", hbuf); 1132 else if (lflag) 1133 Printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1134 else 1135 Printf(" %s", inetname((struct sockaddr *)from)); 1136 1137 if (verbose) { 1138 #ifdef OLDRAWSOCKET 1139 Printf(" %d bytes to %s", cc, 1140 inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1141 hbuf, sizeof(hbuf))); 1142 #else 1143 Printf(" %d bytes of data to %s", cc, 1144 inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1145 hbuf, sizeof(hbuf))); 1146 #endif 1147 } 1148 } 1149 1150 /* 1151 * Subtract 2 timeval structs: out = out - in. 1152 * Out is assumed to be >= in. 1153 */ 1154 void 1155 tvsub(out, in) 1156 register struct timeval *out, *in; 1157 { 1158 if ((out->tv_usec -= in->tv_usec) < 0) { 1159 out->tv_sec--; 1160 out->tv_usec += 1000000; 1161 } 1162 out->tv_sec -= in->tv_sec; 1163 } 1164 1165 1166 /* 1167 * Construct an Internet address representation. 1168 * If the nflag has been supplied, give 1169 * numeric value, otherwise try for symbolic name. 1170 */ 1171 const char * 1172 inetname(sa) 1173 struct sockaddr *sa; 1174 { 1175 register char *cp; 1176 static char line[NI_MAXHOST]; 1177 static char domain[MAXHOSTNAMELEN + 1]; 1178 static int first = 1; 1179 1180 if (first && !nflag) { 1181 first = 0; 1182 if (gethostname(domain, MAXHOSTNAMELEN) == 0 && 1183 (cp = index(domain, '.'))) 1184 (void) strcpy(domain, cp + 1); 1185 else 1186 domain[0] = 0; 1187 } 1188 cp = NULL; 1189 if (!nflag) { 1190 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1191 NI_NAMEREQD) == 0) { 1192 if ((cp = index(line, '.')) && 1193 !strcmp(cp + 1, domain)) 1194 *cp = 0; 1195 cp = line; 1196 } 1197 } 1198 if (cp) 1199 return cp; 1200 1201 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1202 NI_NUMERICHOST | niflag) != 0) 1203 strcpy(line, "invalid"); 1204 return line; 1205 } 1206 1207 void 1208 usage() 1209 { 1210 (void)fprintf(stderr, 1211 "usage: traceroute6 [-dlnrv] [-m max_hops] [-p port#] [-q nqueries]\n\t\ 1212 [-s src_addr] [-g gateway] [-w wait] host [data size]\n"); 1213 exit(1); 1214 } 1215
Indexes created Mon Oct 27 08:10:08 GMT 2025