traceroute6.c revision 1.50
1 /* $NetBSD: traceroute6.c,v 1.50 2018/04/23 10:23:38 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 1.50 2018/04/23 10:23:38 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 static double deltaT(struct timeval *, struct timeval *); 323 static const char *pr_type(int); 324 static int packet_ok(struct msghdr *, ssize_t, int); 325 static void print(struct msghdr *, int); 326 static const char *inetname(struct sockaddr *); 327 static void usage(void) __attribute__((__noreturn__)); 328 329 static int rcvsock; /* receive (icmp) socket file descriptor */ 330 static int sndsock; /* send (udp) socket file descriptor */ 331 332 static struct msghdr rcvmhdr; 333 static struct iovec rcviov[2]; 334 static int rcvhlim; 335 static struct in6_pktinfo *rcvpktinfo; 336 337 static struct sockaddr_in6 Src, Dst, Rcv; 338 static u_long datalen; /* How much data */ 339 #define ICMP6ECHOLEN 8 340 341 static char *source; 342 static char *hostname; 343 344 static u_long nprobes = 3; 345 static u_long first_hop = 1; 346 static u_long max_hops = 30; 347 static u_int16_t srcport; 348 static u_int16_t port = 32768+666;/* start udp dest port # for probe packets */ 349 static u_int16_t ident; 350 static int options; /* socket options */ 351 static int verbose; 352 static int waittime = 5; /* time to wait for response (in seconds) */ 353 static int nflag; /* print addresses numerically */ 354 static int useicmp; 355 static int lflag; /* print both numerical address & hostname */ 356 static int as_path; /* print as numbers for each hop */ 357 static char *as_server = NULL; 358 static void *asn; 359 360 int 361 main(int argc, char *argv[]) 362 { 363 int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM }; 364 char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep; 365 int ch, i, on = 1, seq, rcvcmsglen, error; 366 u_long minlen; 367 struct addrinfo hints, *res; 368 static u_char *rcvcmsgbuf; 369 u_long probe, hops, lport; 370 size_t size; 371 372 /* 373 * Receive ICMP 374 */ 375 if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) 376 err(5, "socket(ICMPv6)"); 377 378 /* revoke privs */ 379 seteuid(getuid()); 380 setuid(getuid()); 381 382 size = sizeof(i); 383 (void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0); 384 max_hops = i; 385 386 /* specify to tell receiving interface */ 387 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on, 388 sizeof(on)) < 0) 389 err(1, "setsockopt(IPV6_RECVPKTINFO)"); 390 391 /* specify to tell value of hoplimit field of received IP6 hdr */ 392 if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on, 393 sizeof(on)) < 0) 394 err(1, "setsockopt(IPV6_RECVHOPLIMIT)"); 395 396 seq = 0; 397 398 while ((ch = getopt(argc, argv, "aA:df:Ilm:np:q:rs:w:v")) != -1) 399 switch (ch) { 400 case 'a': 401 as_path = 1; 402 break; 403 case 'A': 404 as_path = 1; 405 as_server = optarg; 406 break; 407 case 'd': 408 options |= SO_DEBUG; 409 break; 410 case 'f': 411 ep = NULL; 412 errno = 0; 413 first_hop = strtoul(optarg, &ep, 0); 414 if (errno || !*optarg || *ep|| first_hop > 255) 415 errx(1, "Invalid min hoplimit `%s'", optarg); 416 break; 417 case 'I': 418 useicmp++; 419 /* same as ping6 */ 420 ident = htons(arc4random() & 0xffff); 421 break; 422 case 'l': 423 lflag++; 424 break; 425 case 'm': 426 ep = NULL; 427 errno = 0; 428 max_hops = strtoul(optarg, &ep, 0); 429 if (errno || !*optarg || *ep || max_hops > 255) 430 errx(1, "Invalid max hoplimit `%s'", optarg); 431 break; 432 case 'n': 433 nflag++; 434 break; 435 case 'p': 436 ep = NULL; 437 errno = 0; 438 lport = strtoul(optarg, &ep, 0); 439 if (errno || !*optarg || *ep) 440 errx(1, "Invalid port `%s'", optarg); 441 if (lport == 0 || lport != (lport & 0xffff)) 442 errx(1, "Port `%s' out of range", optarg); 443 port = lport & 0xffff; 444 break; 445 case 'q': 446 ep = NULL; 447 errno = 0; 448 nprobes = strtoul(optarg, &ep, 0); 449 if (errno || !*optarg || *ep) 450 errx(1, "Invalid nprobes `%s'", optarg); 451 if (nprobes < 1) 452 errx(1, "nprobes `%s' must be > 0", optarg); 453 break; 454 case 'r': 455 options |= SO_DONTROUTE; 456 break; 457 case 's': 458 /* 459 * set the ip source address of the outbound 460 * probe (e.g., on a multi-homed host). 461 */ 462 source = optarg; 463 break; 464 case 'v': 465 verbose++; 466 break; 467 case 'w': 468 ep = NULL; 469 errno = 0; 470 waittime = strtoul(optarg, &ep, 0); 471 if (errno || !*optarg || *ep) 472 errx(1, "Invalid wait time `%s'", optarg); 473 if (waittime <= 1) 474 errx(1, "Wait `%s' must be > 1 sec", optarg); 475 break; 476 default: 477 usage(); 478 } 479 argc -= optind; 480 argv += optind; 481 482 if (max_hops < first_hop) 483 errx(1, "max hoplimit `%lu' must be larger than " 484 "first hoplimit `%lu'", max_hops, first_hop); 485 486 if (argc < 1 || argc > 2) 487 usage(); 488 489 #if 1 490 setvbuf(stdout, NULL, _IOLBF, BUFSIZ); 491 #else 492 setlinebuf(stdout); 493 #endif 494 495 memset(&hints, 0, sizeof(hints)); 496 hints.ai_family = PF_INET6; 497 hints.ai_socktype = SOCK_RAW; 498 hints.ai_protocol = IPPROTO_ICMPV6; 499 hints.ai_flags = AI_CANONNAME; 500 error = getaddrinfo(*argv, NULL, &hints, &res); 501 if (error) 502 errx(1, "%s", gai_strerror(error)); 503 if (res->ai_addrlen != sizeof(Dst)) 504 errx(1, "size of sockaddr mismatch"); 505 memcpy(&Dst, res->ai_addr, res->ai_addrlen); 506 hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv; 507 if (!hostname) 508 err(1, NULL); 509 if (res->ai_next) { 510 if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, 511 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 512 strlcpy(hbuf, "?", sizeof(hbuf)); 513 warnx("`%s' has multiple addresses; using `%s'", 514 hostname, hbuf); 515 } 516 517 if (*++argv) { 518 ep = NULL; 519 errno = 0; 520 datalen = strtoul(*argv, &ep, 0); 521 if (errno || *ep) 522 errx(1, "Invalid packet length `%s'", *argv); 523 } 524 if (useicmp) 525 minlen = ICMP6ECHOLEN + sizeof(struct tv32); 526 else 527 minlen = sizeof(struct opacket); 528 if (datalen < minlen) 529 datalen = minlen; 530 else if (datalen >= MAXPACKET) 531 errx(1, "Packet size must be %lu <= s < %lu", 532 minlen, (u_long)MAXPACKET); 533 outpacket = (struct opacket *)malloc((unsigned)datalen); 534 if (!outpacket) 535 err(1, NULL); 536 memset(outpacket, 0, datalen); 537 538 /* initialize msghdr for receiving packets */ 539 rcviov[0].iov_base = (caddr_t)packet; 540 rcviov[0].iov_len = sizeof(packet); 541 rcvmhdr.msg_name = (caddr_t)&Rcv; 542 rcvmhdr.msg_namelen = sizeof(Rcv); 543 rcvmhdr.msg_iov = rcviov; 544 rcvmhdr.msg_iovlen = 1; 545 rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) + 546 CMSG_SPACE(sizeof(int)); 547 if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) 548 err(1, NULL); 549 rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf; 550 rcvmhdr.msg_controllen = rcvcmsglen; 551 552 if (options & SO_DEBUG) 553 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG, 554 (char *)&on, sizeof(on)); 555 if (options & SO_DONTROUTE) 556 (void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE, 557 (char *)&on, sizeof(on)); 558 #ifdef IPSEC 559 #ifdef IPSEC_POLICY_IPSEC 560 /* 561 * do not raise error even if setsockopt fails, kernel may have ipsec 562 * turned off. 563 */ 564 if (setpolicy(rcvsock, "in bypass") < 0) 565 errx(1, "%s", ipsec_strerror()); 566 if (setpolicy(rcvsock, "out bypass") < 0) 567 errx(1, "%s", ipsec_strerror()); 568 #else 569 { 570 int level = IPSEC_LEVEL_NONE; 571 572 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 573 sizeof(level)); 574 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 575 sizeof(level)); 576 #ifdef IP_AUTH_TRANS_LEVEL 577 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 578 sizeof(level)); 579 #else 580 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 581 sizeof(level)); 582 #endif 583 #ifdef IP_AUTH_NETWORK_LEVEL 584 (void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 585 sizeof(level)); 586 #endif 587 } 588 #endif /*IPSEC_POLICY_IPSEC*/ 589 #endif /*IPSEC*/ 590 591 /* 592 * Send UDP or ICMP 593 */ 594 if (useicmp) { 595 sndsock = rcvsock; 596 } else { 597 if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 598 err(5, "socket(SOCK_DGRAM)"); 599 } 600 #ifdef SO_SNDBUF 601 i = datalen; 602 if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i, 603 sizeof(i)) < 0) 604 err(6, "setsockopt(SO_SNDBUF)"); 605 #endif /* SO_SNDBUF */ 606 if (options & SO_DEBUG) 607 (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, 608 (char *)&on, sizeof(on)); 609 if (options & SO_DONTROUTE) 610 (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, 611 (char *)&on, sizeof(on)); 612 613 #ifdef IPSEC 614 #ifdef IPSEC_POLICY_IPSEC 615 /* 616 * do not raise error even if setsockopt fails, kernel may have ipsec 617 * turned off. 618 */ 619 if (setpolicy(sndsock, "in bypass") < 0) 620 errx(1, "%s", ipsec_strerror()); 621 if (setpolicy(sndsock, "out bypass") < 0) 622 errx(1, "%s", ipsec_strerror()); 623 #else 624 { 625 int level = IPSEC_LEVEL_BYPASS; 626 627 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level, 628 sizeof(level)); 629 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level, 630 sizeof(level)); 631 #ifdef IP_AUTH_TRANS_LEVEL 632 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level, 633 sizeof(level)); 634 #else 635 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level, 636 sizeof(level)); 637 #endif 638 #ifdef IP_AUTH_NETWORK_LEVEL 639 (void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level, 640 sizeof(level)); 641 #endif 642 } 643 #endif /*IPSEC_POLICY_IPSEC*/ 644 #endif /*IPSEC*/ 645 646 /* 647 * Source selection 648 */ 649 memset(&Src, 0, sizeof(Src)); 650 if (source) { 651 struct addrinfo hints0, *res0; 652 int error0; 653 654 memset(&hints0, 0, sizeof(hints0)); 655 hints0.ai_family = AF_INET6; 656 hints0.ai_socktype = SOCK_DGRAM; /*dummy*/ 657 hints0.ai_flags = AI_NUMERICHOST; 658 error0 = getaddrinfo(source, "0", &hints0, &res0); 659 if (error0) 660 errx(1, "Cannot get address for `%s' (%s)", source, 661 gai_strerror(error0)); 662 if (res0->ai_addrlen > sizeof(Src)) 663 errx(1, "Bad incompatible address length"); 664 memcpy(&Src, res0->ai_addr, res0->ai_addrlen); 665 freeaddrinfo(res0); 666 } else { 667 struct sockaddr_in6 Nxt; 668 int dummy; 669 socklen_t len; 670 671 Nxt = Dst; 672 Nxt.sin6_port = htons(DUMMY_PORT); 673 674 if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 675 err(1, "socket"); 676 if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) 677 err(1, "connect"); 678 len = sizeof(Src); 679 if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) 680 err(1, "getsockname"); 681 if ((error = getnameinfo((struct sockaddr *)&Src, Src.sin6_len, 682 src0, sizeof(src0), NULL, 0, NI_NUMERICHOST))) 683 errx(1, "getnameinfo failed for source (%s)", 684 gai_strerror(error)); 685 source = src0; 686 close(dummy); 687 } 688 689 Src.sin6_port = htons(0); 690 if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) 691 err(1, "bind"); 692 693 { 694 socklen_t len; 695 696 len = sizeof(Src); 697 if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) 698 err(1, "bind"); 699 srcport = ntohs(Src.sin6_port); 700 } 701 702 if (as_path) { 703 asn = as_setup(as_server); 704 if (asn == NULL) { 705 warnx("as_setup failed, AS# lookups disabled"); 706 (void)fflush(stderr); 707 as_path = 0; 708 } 709 } 710 711 /* 712 * Message to users 713 */ 714 if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf, 715 sizeof(hbuf), NULL, 0, NI_NUMERICHOST)) 716 strlcpy(hbuf, "(invalid)", sizeof(hbuf)); 717 fprintf(stderr, "traceroute6"); 718 fprintf(stderr, " to %s (%s)", hostname, hbuf); 719 if (source) 720 fprintf(stderr, " from %s", source); 721 fprintf(stderr, ", %lu hops max, %lu byte packets\n", 722 max_hops, datalen); 723 (void) fflush(stderr); 724 725 if (first_hop > 1) 726 printf("Skipping %lu intermediate hops\n", first_hop - 1); 727 728 /* 729 * Main loop 730 */ 731 for (hops = first_hop; hops <= max_hops; ++hops) { 732 struct in6_addr lastaddr; 733 int got_there = 0; 734 u_long unreachable = 0; 735 736 printf("%2lu ", hops); 737 memset(&lastaddr, 0, sizeof(lastaddr)); 738 for (probe = 0; probe < nprobes; ++probe) { 739 int cc; 740 struct timeval t1, t2; 741 742 (void) gettimeofday(&t1, NULL); 743 if (!useicmp && htons((in_port_t)(port + seq + 1)) == 0) 744 seq++; 745 send_probe(++seq, hops); 746 while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) { 747 (void) gettimeofday(&t2, NULL); 748 if ((i = packet_ok(&rcvmhdr, cc, seq))) { 749 if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr, 750 &lastaddr)) { 751 print(&rcvmhdr, cc); 752 lastaddr = Rcv.sin6_addr; 753 } 754 printf(" %g ms", deltaT(&t1, &t2)); 755 switch (i - 1) { 756 case ICMP6_DST_UNREACH_NOROUTE: 757 ++unreachable; 758 printf(" !N"); 759 break; 760 case ICMP6_DST_UNREACH_ADMIN: 761 ++unreachable; 762 printf(" !X"); 763 break; 764 case ICMP6_DST_UNREACH_NOTNEIGHBOR: 765 ++unreachable; 766 printf(" !S"); 767 break; 768 case ICMP6_DST_UNREACH_ADDR: 769 ++unreachable; 770 printf(" !H"); 771 break; 772 case ICMP6_DST_UNREACH_NOPORT: 773 if (rcvhlim >= 0 && 774 rcvhlim <= 1) 775 printf(" !"); 776 ++got_there; 777 break; 778 } 779 break; 780 } 781 } 782 if (cc == 0) 783 printf(" *"); 784 (void) fflush(stdout); 785 } 786 putchar('\n'); 787 if (got_there || 788 (unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) { 789 exit(0); 790 } 791 } 792 793 if (as_path) 794 as_shutdown(asn); 795 796 exit(0); 797 } 798 799 static ssize_t 800 wait_for_reply(int sock, struct msghdr *mhdr) 801 { 802 #ifdef HAVE_POLL 803 struct pollfd pfd[1]; 804 ssize_t cc = 0; 805 806 pfd[0].fd = sock; 807 pfd[0].events = POLLIN; 808 pfd[0].revents = 0; 809 810 if (poll(pfd, 1, waittime * 1000) > 0) 811 cc = recvmsg(rcvsock, mhdr, 0); 812 813 return cc; 814 #else 815 fd_set *fdsp; 816 struct timeval wait; 817 ssize_t cc = 0; 818 int fdsn; 819 820 fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask); 821 if ((fdsp = (fd_set *)malloc(fdsn)) == NULL) 822 err(1, "malloc"); 823 memset(fdsp, 0, fdsn); 824 FD_SET(sock, fdsp); 825 wait.tv_sec = waittime; wait.tv_usec = 0; 826 827 if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0) 828 cc = recvmsg(rcvsock, mhdr, 0); 829 830 free(fdsp); 831 return cc; 832 #endif 833 } 834 835 #ifdef IPSEC 836 #ifdef IPSEC_POLICY_IPSEC 837 static int 838 setpolicy(int so, const char *policy) 839 { 840 char *buf; 841 842 buf = ipsec_set_policy(policy, strlen(policy)); 843 if (buf == NULL) { 844 warnx("%s", ipsec_strerror()); 845 return -1; 846 } 847 (void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY, 848 buf, ipsec_get_policylen(buf)); 849 850 free(buf); 851 852 return 0; 853 } 854 #endif 855 #endif 856 857 static void 858 send_probe(int seq, u_long hops) 859 { 860 struct timeval tv; 861 struct tv32 tv32; 862 int i; 863 864 i = hops; 865 if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS, 866 (char *)&i, sizeof(i)) < 0) 867 warn("setsockopt IPV6_UNICAST_HOPS"); 868 869 Dst.sin6_port = htons(port + seq); 870 (void) gettimeofday(&tv, NULL); 871 tv32.tv32_sec = htonl(tv.tv_sec); 872 tv32.tv32_usec = htonl(tv.tv_usec); 873 874 if (useicmp) { 875 struct icmp6_hdr *icp = (struct icmp6_hdr *)outpacket; 876 877 icp->icmp6_type = ICMP6_ECHO_REQUEST; 878 icp->icmp6_code = 0; 879 icp->icmp6_cksum = 0; 880 icp->icmp6_id = ident; 881 icp->icmp6_seq = htons(seq); 882 memcpy(((u_int8_t *)outpacket + ICMP6ECHOLEN), &tv32, 883 sizeof(tv32)); 884 } else { 885 struct opacket *op = outpacket; 886 887 op->seq = seq; 888 op->hops = hops; 889 memcpy(&op->tv, &tv32, sizeof tv32); 890 } 891 892 i = sendto(sndsock, (char *)outpacket, datalen , 0, 893 (struct sockaddr *)&Dst, Dst.sin6_len); 894 if (i < 0 || i != (int)datalen) { 895 if (i < 0) 896 warnx("sendto"); 897 printf("traceroute6: wrote %s %lu chars, ret=%d\n", 898 hostname, datalen, i); 899 (void) fflush(stdout); 900 } 901 } 902 903 static double 904 deltaT(struct timeval *t1p, struct timeval *t2p) 905 { 906 double dt; 907 908 dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + 909 (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; 910 return dt; 911 } 912 913 /* 914 * Convert an ICMP "type" field to a printable string. 915 */ 916 static const char * 917 pr_type(int t0) 918 { 919 u_char t = t0 & 0xff; 920 const char *cp; 921 922 switch (t) { 923 case ICMP6_DST_UNREACH: 924 cp = "Destination Unreachable"; 925 break; 926 case ICMP6_PACKET_TOO_BIG: 927 cp = "Packet Too Big"; 928 break; 929 case ICMP6_TIME_EXCEEDED: 930 cp = "Time Exceeded"; 931 break; 932 case ICMP6_PARAM_PROB: 933 cp = "Parameter Problem"; 934 break; 935 case ICMP6_ECHO_REQUEST: 936 cp = "Echo Request"; 937 break; 938 case ICMP6_ECHO_REPLY: 939 cp = "Echo Reply"; 940 break; 941 case ICMP6_MEMBERSHIP_QUERY: 942 cp = "Group Membership Query"; 943 break; 944 case ICMP6_MEMBERSHIP_REPORT: 945 cp = "Group Membership Report"; 946 break; 947 case ICMP6_MEMBERSHIP_REDUCTION: 948 cp = "Group Membership Reduction"; 949 break; 950 case ND_ROUTER_SOLICIT: 951 cp = "Router Solicitation"; 952 break; 953 case ND_ROUTER_ADVERT: 954 cp = "Router Advertisement"; 955 break; 956 case ND_NEIGHBOR_SOLICIT: 957 cp = "Neighbor Solicitation"; 958 break; 959 case ND_NEIGHBOR_ADVERT: 960 cp = "Neighbor Advertisement"; 961 break; 962 case ND_REDIRECT: 963 cp = "Redirect"; 964 break; 965 default: 966 cp = "Unknown"; 967 break; 968 } 969 return cp; 970 } 971 972 static int 973 packet_ok(struct msghdr *mhdr, ssize_t cc, int seq) 974 { 975 struct icmp6_hdr *icp; 976 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 977 u_char type, code; 978 char *buf = (char *)mhdr->msg_iov[0].iov_base; 979 struct cmsghdr *cm; 980 int *hlimp; 981 char hbuf[NI_MAXHOST]; 982 983 if (cc < (ssize_t)sizeof(struct icmp6_hdr)) { 984 if (verbose) { 985 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 986 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 987 strlcpy(hbuf, "invalid", sizeof(hbuf)); 988 printf("data too short (%zd bytes) from %s\n", cc, 989 hbuf); 990 } 991 return 0; 992 } 993 icp = (struct icmp6_hdr *)buf; 994 995 /* get optional information via advanced API */ 996 rcvpktinfo = NULL; 997 hlimp = NULL; 998 for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm; 999 cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) { 1000 if (cm->cmsg_level == IPPROTO_IPV6 && 1001 cm->cmsg_type == IPV6_PKTINFO && 1002 cm->cmsg_len == 1003 CMSG_LEN(sizeof(struct in6_pktinfo))) 1004 rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm)); 1005 1006 if (cm->cmsg_level == IPPROTO_IPV6 && 1007 cm->cmsg_type == IPV6_HOPLIMIT && 1008 cm->cmsg_len == CMSG_LEN(sizeof(int))) 1009 hlimp = (int *)CMSG_DATA(cm); 1010 } 1011 if (rcvpktinfo == NULL || hlimp == NULL) { 1012 warnx("failed to get received hop limit or packet info"); 1013 #if 0 1014 return 0; 1015 #else 1016 rcvhlim = 0; /*XXX*/ 1017 #endif 1018 } 1019 else 1020 rcvhlim = *hlimp; 1021 1022 type = icp->icmp6_type; 1023 code = icp->icmp6_code; 1024 if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) 1025 || type == ICMP6_DST_UNREACH) { 1026 struct ip6_hdr *hip; 1027 struct udphdr *up; 1028 1029 hip = (struct ip6_hdr *)(icp + 1); 1030 if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) { 1031 if (verbose) 1032 warnx("failed to get upper layer header"); 1033 return 0; 1034 } 1035 if (useicmp && 1036 ((struct icmp6_hdr *)up)->icmp6_id == ident && 1037 ((struct icmp6_hdr *)up)->icmp6_seq == htons(seq)) 1038 return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1; 1039 else if (!useicmp && 1040 up->uh_sport == htons(srcport) && 1041 up->uh_dport == htons(port + seq)) 1042 return type == ICMP6_TIME_EXCEEDED ? -1 : code + 1; 1043 } else if (useicmp && type == ICMP6_ECHO_REPLY) { 1044 if (icp->icmp6_id == ident && 1045 icp->icmp6_seq == htons(seq)) 1046 return ICMP6_DST_UNREACH_NOPORT + 1; 1047 } 1048 if (verbose) { 1049 char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN]; 1050 u_int8_t *p; 1051 ssize_t i; 1052 1053 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1054 sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0) 1055 strlcpy(sbuf, "invalid", sizeof(sbuf)); 1056 printf("\n%zd bytes from %s to %s", cc, sbuf, 1057 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1058 dbuf, sizeof(dbuf)) : "?"); 1059 printf(": icmp type %d (%s) code %d\n", type, pr_type(type), 1060 icp->icmp6_code); 1061 p = (u_int8_t *)(icp + 1); 1062 #define WIDTH 16 1063 for (i = 0; i < cc; i++) { 1064 if (i % WIDTH == 0) 1065 printf("%04zx:", i); 1066 if (i % 4 == 0) 1067 printf(" "); 1068 printf("%02x", p[i]); 1069 if (i % WIDTH == WIDTH - 1) 1070 printf("\n"); 1071 } 1072 if (cc % WIDTH != 0) 1073 printf("\n"); 1074 } 1075 return 0; 1076 } 1077 1078 /* 1079 * Increment pointer until find the UDP or ICMP header. 1080 */ 1081 static struct udphdr * 1082 get_udphdr(struct ip6_hdr *ip6, u_char *lim) 1083 { 1084 u_char *cp = (u_char *)ip6, nh; 1085 int hlen; 1086 1087 if (cp + sizeof(*ip6) >= lim) 1088 return NULL; 1089 1090 nh = ip6->ip6_nxt; 1091 cp += sizeof(struct ip6_hdr); 1092 1093 while (lim - cp >= 8) { 1094 switch (nh) { 1095 case IPPROTO_ESP: 1096 case IPPROTO_TCP: 1097 return NULL; 1098 case IPPROTO_ICMPV6: 1099 return useicmp ? (struct udphdr *)cp : NULL; 1100 case IPPROTO_UDP: 1101 return useicmp ? NULL : (struct udphdr *)cp; 1102 case IPPROTO_FRAGMENT: 1103 hlen = sizeof(struct ip6_frag); 1104 nh = ((struct ip6_frag *)cp)->ip6f_nxt; 1105 break; 1106 case IPPROTO_AH: 1107 hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2; 1108 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1109 break; 1110 default: 1111 hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3; 1112 nh = ((struct ip6_ext *)cp)->ip6e_nxt; 1113 break; 1114 } 1115 1116 cp += hlen; 1117 } 1118 1119 return NULL; 1120 } 1121 1122 static void 1123 print(struct msghdr *mhdr, int cc) 1124 { 1125 struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name; 1126 char hbuf[NI_MAXHOST]; 1127 1128 if (getnameinfo((struct sockaddr *)from, from->sin6_len, 1129 hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) 1130 strlcpy(hbuf, "invalid", sizeof(hbuf)); 1131 if (as_path) 1132 printf(" [AS%u]", as_lookup(asn, hbuf, AF_INET6)); 1133 if (nflag) 1134 printf(" %s", hbuf); 1135 else if (lflag) 1136 printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf); 1137 else 1138 printf(" %s", inetname((struct sockaddr *)from)); 1139 1140 if (verbose) { 1141 printf(" %d bytes of data to %s", cc, 1142 rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr, 1143 hbuf, sizeof(hbuf)) : "?"); 1144 } 1145 } 1146 1147 /* 1148 * Construct an Internet address representation. 1149 * If the nflag has been supplied, give 1150 * numeric value, otherwise try for symbolic name. 1151 */ 1152 static const char * 1153 inetname(struct sockaddr *sa) 1154 { 1155 static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1]; 1156 static int first = 1; 1157 char *cp; 1158 1159 if (first && !nflag) { 1160 first = 0; 1161 if (gethostname(domain, sizeof(domain)) == 0 && 1162 (cp = strchr(domain, '.'))) 1163 (void) strlcpy(domain, cp + 1, sizeof(domain)); 1164 else 1165 domain[0] = 0; 1166 } 1167 cp = NULL; 1168 if (!nflag) { 1169 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1170 NI_NAMEREQD) == 0) { 1171 if ((cp = strchr(line, '.')) && 1172 !strcmp(cp + 1, domain)) 1173 *cp = 0; 1174 cp = line; 1175 } 1176 } 1177 if (cp) 1178 return cp; 1179 1180 if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0, 1181 NI_NUMERICHOST) != 0) 1182 strlcpy(line, "invalid", sizeof(line)); 1183 return line; 1184 } 1185 1186 static void 1187 usage(void) 1188 { 1189 1190 fprintf(stderr, 1191 "Usage: %s [-adIlnrv] [-A as_server] [-f firsthop] [-m hoplimit]\n" 1192 "\t[-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n", 1193 getprogname()); 1194 exit(1); 1195 } 1196
Indexes created Mon Oct 20 03:09:53 GMT 2025