Lorenzo Colitti | 313379e | 2013-07-11 01:07:11 +0900 | [diff] [blame] | 1 | /* |
| 2 | * Modified for NRL 4.4BSD IPv6 release. |
| 3 | * 07/31/96 bgp |
| 4 | * |
| 5 | * Search for "#ifdef NRL" to find the changes. |
| 6 | */ |
| 7 | |
| 8 | /* |
| 9 | * Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt> |
| 10 | * 31/07/1996 |
| 11 | * |
| 12 | * As ICMP error messages for IPv6 now include more than 8 bytes |
| 13 | * UDP datagrams are now sent via an UDP socket instead of magic |
| 14 | * RAW socket tricks. |
| 15 | * |
| 16 | * Original copyright and comments left intact. They might not |
| 17 | * match the code anymore. |
| 18 | */ |
| 19 | |
| 20 | /*- |
| 21 | * Copyright (c) 1990, 1993 |
| 22 | * The Regents of the University of California. All rights reserved. |
| 23 | * |
| 24 | * This code is derived from software contributed to Berkeley by |
| 25 | * Van Jacobson. |
| 26 | * |
| 27 | * Redistribution and use in source and binary forms, with or without |
| 28 | * modification, are permitted provided that the following conditions |
| 29 | * are met: |
| 30 | * 1. Redistributions of source code must retain the above copyright |
| 31 | * notice, this list of conditions and the following disclaimer. |
| 32 | * 2. Redistributions in binary form must reproduce the above copyright |
| 33 | * notice, this list of conditions and the following disclaimer in the |
| 34 | * documentation and/or other materials provided with the distribution. |
| 35 | * 3. All advertising materials mentioning features or use of this software |
| 36 | * must display the following acknowledgement: |
| 37 | * This product includes software developed by the University of |
| 38 | * California, Berkeley and its contributors. |
| 39 | * 4. Neither the name of the University nor the names of its contributors |
| 40 | * may be used to endorse or promote products derived from this software |
| 41 | * without specific prior written permission. |
| 42 | * |
| 43 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 44 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 45 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 46 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 47 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 48 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 49 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 50 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 51 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 52 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 53 | * SUCH DAMAGE. |
| 54 | */ |
| 55 | |
| 56 | #ifndef lint |
| 57 | char copyright[] = |
| 58 | "@(#) Copyright (c) 1990, 1993\n\ |
| 59 | The Regents of the University of California. All rights reserved.\n"; |
| 60 | #endif /* not lint */ |
| 61 | |
| 62 | /* |
| 63 | * traceroute host - trace the route ip packets follow going to "host". |
| 64 | * |
| 65 | * Attempt to trace the route an ip packet would follow to some |
| 66 | * internet host. We find out intermediate hops by launching probe |
| 67 | * packets with a small ttl (time to live) then listening for an |
| 68 | * icmp "time exceeded" reply from a gateway. We start our probes |
| 69 | * with a ttl of one and increase by one until we get an icmp "port |
| 70 | * unreachable" (which means we got to "host") or hit a max (which |
| 71 | * defaults to 30 hops & can be changed with the -m flag). Three |
| 72 | * probes (change with -q flag) are sent at each ttl setting and a |
| 73 | * line is printed showing the ttl, address of the gateway and |
| 74 | * round trip time of each probe. If the probe answers come from |
| 75 | * different gateways, the address of each responding system will |
| 76 | * be printed. If there is no response within a 5 sec. timeout |
| 77 | * interval (changed with the -w flag), a "*" is printed for that |
| 78 | * probe. |
| 79 | * |
| 80 | * Probe packets are UDP format. We don't want the destination |
| 81 | * host to process them so the destination port is set to an |
| 82 | * unlikely value (if some clod on the destination is using that |
| 83 | * value, it can be changed with the -p flag). |
| 84 | * |
| 85 | * A sample use might be: |
| 86 | * |
| 87 | * [yak 71]% traceroute nis.nsf.net. |
| 88 | * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet |
| 89 | * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms |
| 90 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| 91 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms |
| 92 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms |
| 93 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms |
| 94 | * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms |
| 95 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms |
| 96 | * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms |
| 97 | * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms |
| 98 | * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms |
| 99 | * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms |
| 100 | * |
| 101 | * Note that lines 2 & 3 are the same. This is due to a buggy |
| 102 | * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards |
| 103 | * packets with a zero ttl. |
| 104 | * |
| 105 | * A more interesting example is: |
| 106 | * |
| 107 | * [yak 72]% traceroute allspice.lcs.mit.edu. |
| 108 | * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max |
| 109 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| 110 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms |
| 111 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms |
| 112 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms |
| 113 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms |
| 114 | * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms |
| 115 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms |
| 116 | * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms |
| 117 | * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms |
| 118 | * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms |
| 119 | * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms |
| 120 | * 12 * * * |
| 121 | * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms |
| 122 | * 14 * * * |
| 123 | * 15 * * * |
| 124 | * 16 * * * |
| 125 | * 17 * * * |
| 126 | * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms |
| 127 | * |
| 128 | * (I start to see why I'm having so much trouble with mail to |
| 129 | * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away |
| 130 | * either don't send ICMP "time exceeded" messages or send them |
| 131 | * with a ttl too small to reach us. 14 - 17 are running the |
| 132 | * MIT C Gateway code that doesn't send "time exceeded"s. God |
| 133 | * only knows what's going on with 12. |
| 134 | * |
| 135 | * The silent gateway 12 in the above may be the result of a bug in |
| 136 | * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3) |
| 137 | * sends an unreachable message using whatever ttl remains in the |
| 138 | * original datagram. Since, for gateways, the remaining ttl is |
| 139 | * zero, the icmp "time exceeded" is guaranteed to not make it back |
| 140 | * to us. The behavior of this bug is slightly more interesting |
| 141 | * when it appears on the destination system: |
| 142 | * |
| 143 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms |
| 144 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms |
| 145 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms |
| 146 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms |
| 147 | * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms |
| 148 | * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms |
| 149 | * 7 * * * |
| 150 | * 8 * * * |
| 151 | * 9 * * * |
| 152 | * 10 * * * |
| 153 | * 11 * * * |
| 154 | * 12 * * * |
| 155 | * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms ! |
| 156 | * |
| 157 | * Notice that there are 12 "gateways" (13 is the final |
| 158 | * destination) and exactly the last half of them are "missing". |
| 159 | * What's really happening is that rip (a Sun-3 running Sun OS3.5) |
| 160 | * is using the ttl from our arriving datagram as the ttl in its |
| 161 | * icmp reply. So, the reply will time out on the return path |
| 162 | * (with no notice sent to anyone since icmp's aren't sent for |
| 163 | * icmp's) until we probe with a ttl that's at least twice the path |
| 164 | * length. I.e., rip is really only 7 hops away. A reply that |
| 165 | * returns with a ttl of 1 is a clue this problem exists. |
| 166 | * Traceroute prints a "!" after the time if the ttl is <= 1. |
| 167 | * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or |
| 168 | * non-standard (HPUX) software, expect to see this problem |
| 169 | * frequently and/or take care picking the target host of your |
| 170 | * probes. |
| 171 | * |
| 172 | * Other possible annotations after the time are !H, !N, !P (got a host, |
| 173 | * network or protocol unreachable, respectively), !S or !F (source |
| 174 | * route failed or fragmentation needed -- neither of these should |
| 175 | * ever occur and the associated gateway is busted if you see one). If |
| 176 | * almost all the probes result in some kind of unreachable, traceroute |
| 177 | * will give up and exit. |
| 178 | * |
| 179 | * Notes |
| 180 | * ----- |
| 181 | * This program must be run by root or be setuid. (I suggest that |
| 182 | * you *don't* make it setuid -- casual use could result in a lot |
| 183 | * of unnecessary traffic on our poor, congested nets.) |
| 184 | * |
| 185 | * This program requires a kernel mod that does not appear in any |
| 186 | * system available from Berkeley: A raw ip socket using proto |
| 187 | * IPPROTO_RAW must interpret the data sent as an ip datagram (as |
| 188 | * opposed to data to be wrapped in a ip datagram). See the README |
| 189 | * file that came with the source to this program for a description |
| 190 | * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may |
| 191 | * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE |
| 192 | * MODIFIED TO RUN THIS PROGRAM. |
| 193 | * |
| 194 | * The udp port usage may appear bizarre (well, ok, it is bizarre). |
| 195 | * The problem is that an icmp message only contains 8 bytes of |
| 196 | * data from the original datagram. 8 bytes is the size of a udp |
| 197 | * header so, if we want to associate replies with the original |
| 198 | * datagram, the necessary information must be encoded into the |
| 199 | * udp header (the ip id could be used but there's no way to |
| 200 | * interlock with the kernel's assignment of ip id's and, anyway, |
| 201 | * it would have taken a lot more kernel hacking to allow this |
| 202 | * code to set the ip id). So, to allow two or more users to |
| 203 | * use traceroute simultaneously, we use this task's pid as the |
| 204 | * source port (the high bit is set to move the port number out |
| 205 | * of the "likely" range). To keep track of which probe is being |
| 206 | * replied to (so times and/or hop counts don't get confused by a |
| 207 | * reply that was delayed in transit), we increment the destination |
| 208 | * port number before each probe. |
| 209 | * |
| 210 | * Don't use this as a coding example. I was trying to find a |
| 211 | * routing problem and this code sort-of popped out after 48 hours |
| 212 | * without sleep. I was amazed it ever compiled, much less ran. |
| 213 | * |
| 214 | * I stole the idea for this program from Steve Deering. Since |
| 215 | * the first release, I've learned that had I attended the right |
| 216 | * IETF working group meetings, I also could have stolen it from Guy |
| 217 | * Almes or Matt Mathis. I don't know (or care) who came up with |
| 218 | * the idea first. I envy the originators' perspicacity and I'm |
| 219 | * glad they didn't keep the idea a secret. |
| 220 | * |
| 221 | * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or |
| 222 | * enhancements to the original distribution. |
| 223 | * |
| 224 | * I've hacked up a round-trip-route version of this that works by |
| 225 | * sending a loose-source-routed udp datagram through the destination |
| 226 | * back to yourself. Unfortunately, SO many gateways botch source |
| 227 | * routing, the thing is almost worthless. Maybe one day... |
| 228 | * |
| 229 | * -- Van Jacobson (van@helios.ee.lbl.gov) |
| 230 | * Tue Dec 20 03:50:13 PST 1988 |
| 231 | */ |
| 232 | |
| 233 | #include <sys/param.h> |
| 234 | #include <sys/time.h> |
| 235 | #include <sys/socket.h> |
| 236 | #include <sys/file.h> |
| 237 | #include <sys/ioctl.h> |
| 238 | #include <net/if.h> |
| 239 | |
| 240 | #if __linux__ |
| 241 | #include <endian.h> |
| 242 | #endif |
| 243 | #include <netinet/in_systm.h> |
| 244 | #include <netinet/in.h> |
| 245 | #include <netinet/ip.h> |
| 246 | #include <netinet/ip_icmp.h> |
| 247 | #include <netinet/udp.h> |
| 248 | |
| 249 | #include <netinet/ip6.h> |
| 250 | #include <netinet/icmp6.h> |
| 251 | #include <linux/types.h> |
| 252 | #ifdef CAPABILITIES |
| 253 | #include <sys/capability.h> |
| 254 | #endif |
| 255 | |
| 256 | #ifdef USE_IDN |
| 257 | #include <idna.h> |
| 258 | #include <locale.h> |
| 259 | #endif |
| 260 | |
| 261 | #include <arpa/inet.h> |
| 262 | |
| 263 | #include <netdb.h> |
| 264 | #include <stdio.h> |
| 265 | #include <errno.h> |
| 266 | #include <stdlib.h> |
| 267 | #include <string.h> |
| 268 | #include <unistd.h> |
| 269 | |
| 270 | #include "SNAPSHOT.h" |
| 271 | |
| 272 | #ifndef SOL_IPV6 |
| 273 | #define SOL_IPV6 IPPROTO_IPV6 |
| 274 | #endif |
| 275 | |
| 276 | #define MAXPACKET 65535 |
| 277 | #define MAX_HOSTNAMELEN NI_MAXHOST |
| 278 | |
| 279 | #ifndef FD_SET |
| 280 | #define NFDBITS (8*sizeof(fd_set)) |
| 281 | #define FD_SETSIZE NFDBITS |
| 282 | #define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS))) |
| 283 | #define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS))) |
| 284 | #define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS))) |
| 285 | #define FD_ZERO(p) memset((char *)(p), 0, sizeof(*(p))) |
| 286 | #endif |
| 287 | |
| 288 | #define Fprintf (void)fprintf |
| 289 | #define Printf (void)printf |
| 290 | |
| 291 | u_char packet[512]; /* last inbound (icmp) packet */ |
| 292 | |
| 293 | int wait_for_reply(int, struct sockaddr_in6 *, struct in6_addr *, int); |
| 294 | int packet_ok(u_char *buf, int cc, struct sockaddr_in6 *from, |
| 295 | struct in6_addr *to, int seq, struct timeval *); |
| 296 | void send_probe(int seq, int ttl); |
| 297 | double deltaT (struct timeval *, struct timeval *); |
| 298 | void print(unsigned char *buf, int cc, struct sockaddr_in6 *from); |
| 299 | void tvsub (struct timeval *, struct timeval *); |
| 300 | void usage(void); |
| 301 | |
| 302 | int icmp_sock; /* receive (icmp) socket file descriptor */ |
| 303 | int sndsock; /* send (udp) socket file descriptor */ |
| 304 | struct timezone tz; /* leftover */ |
| 305 | |
| 306 | struct sockaddr_in6 whereto; /* Who to try to reach */ |
| 307 | |
| 308 | struct sockaddr_in6 saddr; |
| 309 | struct sockaddr_in6 firsthop; |
| 310 | char *source = NULL; |
| 311 | char *device = NULL; |
| 312 | char *hostname; |
| 313 | |
| 314 | int nprobes = 3; |
| 315 | int max_ttl = 30; |
| 316 | pid_t ident; |
| 317 | u_short port = 32768+666; /* start udp dest port # for probe packets */ |
| 318 | int options; /* socket options */ |
| 319 | int verbose; |
| 320 | int waittime = 5; /* time to wait for response (in seconds) */ |
| 321 | int nflag; /* print addresses numerically */ |
| 322 | |
| 323 | |
| 324 | struct pkt_format |
| 325 | { |
| 326 | __u32 ident; |
| 327 | __u32 seq; |
| 328 | struct timeval tv; |
| 329 | }; |
| 330 | |
| 331 | char *sendbuff; |
| 332 | int datalen = sizeof(struct pkt_format); |
| 333 | |
| 334 | |
| 335 | |
| 336 | int main(int argc, char *argv[]) |
| 337 | { |
| 338 | char pa[MAX_HOSTNAMELEN]; |
| 339 | extern char *optarg; |
| 340 | extern int optind; |
| 341 | struct hostent *hp; |
| 342 | struct sockaddr_in6 from, *to; |
| 343 | int ch, i, on, probe, seq, tos, ttl; |
| 344 | int socket_errno; |
| 345 | |
| 346 | icmp_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6); |
| 347 | socket_errno = errno; |
| 348 | |
| 349 | if (setuid(getuid())) { |
| 350 | perror("traceroute6: setuid"); |
| 351 | exit(-1); |
| 352 | } |
| 353 | #ifdef CAPABILITIES |
| 354 | { |
| 355 | cap_t caps = cap_init(); |
| 356 | if (cap_set_proc(caps)) { |
| 357 | perror("traceroute6: cap_set_proc"); |
| 358 | exit(-1); |
| 359 | } |
| 360 | cap_free(caps); |
| 361 | } |
| 362 | #endif |
| 363 | |
| 364 | #ifdef USE_IDN |
| 365 | setlocale(LC_ALL, ""); |
| 366 | #endif |
| 367 | |
| 368 | on = 1; |
| 369 | seq = tos = 0; |
| 370 | to = (struct sockaddr_in6 *)&whereto; |
| 371 | while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:vi:g:V")) != EOF) { |
| 372 | switch(ch) { |
| 373 | case 'd': |
| 374 | options |= SO_DEBUG; |
| 375 | break; |
| 376 | case 'm': |
| 377 | max_ttl = atoi(optarg); |
| 378 | if (max_ttl <= 1) { |
| 379 | Fprintf(stderr, |
| 380 | "traceroute: max ttl must be >1.\n"); |
| 381 | exit(1); |
| 382 | } |
| 383 | break; |
| 384 | case 'n': |
| 385 | nflag++; |
| 386 | break; |
| 387 | case 'p': |
| 388 | port = atoi(optarg); |
| 389 | if (port < 1) { |
| 390 | Fprintf(stderr, |
| 391 | "traceroute: port must be >0.\n"); |
| 392 | exit(1); |
| 393 | } |
| 394 | break; |
| 395 | case 'q': |
| 396 | nprobes = atoi(optarg); |
| 397 | if (nprobes < 1) { |
| 398 | Fprintf(stderr, |
| 399 | "traceroute: nprobes must be >0.\n"); |
| 400 | exit(1); |
| 401 | } |
| 402 | break; |
| 403 | case 'r': |
| 404 | options |= SO_DONTROUTE; |
| 405 | break; |
| 406 | case 's': |
| 407 | /* |
| 408 | * set the ip source address of the outbound |
| 409 | * probe (e.g., on a multi-homed host). |
| 410 | */ |
| 411 | source = optarg; |
| 412 | break; |
| 413 | case 'i': |
| 414 | device = optarg; |
| 415 | break; |
| 416 | case 'g': |
| 417 | Fprintf(stderr, "Sorry, rthdr is not yet supported\n"); |
| 418 | break; |
| 419 | case 'v': |
| 420 | verbose++; |
| 421 | break; |
| 422 | case 'w': |
| 423 | waittime = atoi(optarg); |
| 424 | if (waittime <= 1) { |
| 425 | Fprintf(stderr, |
| 426 | "traceroute: wait must be >1 sec.\n"); |
| 427 | exit(1); |
| 428 | } |
| 429 | break; |
| 430 | case 'V': |
| 431 | printf("traceroute6 utility, iputils-%s\n", SNAPSHOT); |
| 432 | exit(0); |
| 433 | default: |
| 434 | usage(); |
| 435 | } |
| 436 | } |
| 437 | argc -= optind; |
| 438 | argv += optind; |
| 439 | |
| 440 | if (argc < 1) |
| 441 | usage(); |
| 442 | |
| 443 | setlinebuf (stdout); |
| 444 | |
| 445 | (void) memset((char *)&whereto, 0, sizeof(whereto)); |
| 446 | |
| 447 | to->sin6_family = AF_INET6; |
| 448 | to->sin6_port = htons(port); |
| 449 | |
| 450 | if (inet_pton(AF_INET6, *argv, &to->sin6_addr) > 0) { |
| 451 | hostname = *argv; |
| 452 | } else { |
| 453 | char *idn = NULL; |
| 454 | #ifdef USE_IDN |
| 455 | if (idna_to_ascii_lz(*argv, &idn, 0) != IDNA_SUCCESS) |
| 456 | idn = NULL; |
| 457 | #endif |
| 458 | hp = gethostbyname2(idn ? idn : *argv, AF_INET6); |
| 459 | if (hp) { |
| 460 | memmove((caddr_t)&to->sin6_addr, hp->h_addr, sizeof(to->sin6_addr)); |
| 461 | hostname = (char *)hp->h_name; |
| 462 | } else { |
| 463 | (void)fprintf(stderr, |
| 464 | "traceroute: unknown host %s\n", *argv); |
| 465 | exit(1); |
| 466 | } |
| 467 | } |
| 468 | firsthop = *to; |
| 469 | if (*++argv) { |
| 470 | datalen = atoi(*argv); |
| 471 | /* Message for rpm maintainers: have _shame_. If you want |
| 472 | * to fix something send the patch to me for sanity checking. |
| 473 | * "datalen" patch is a shit. */ |
| 474 | if (datalen == 0) |
| 475 | datalen = sizeof(struct pkt_format); |
| 476 | else if (datalen < (int)sizeof(struct pkt_format) || |
| 477 | datalen >= MAXPACKET) { |
| 478 | Fprintf(stderr, |
| 479 | "traceroute: packet size must be %d <= s < %d.\n", |
| 480 | (int)sizeof(struct pkt_format), MAXPACKET); |
| 481 | exit(1); |
| 482 | } |
| 483 | } |
| 484 | |
| 485 | ident = getpid(); |
| 486 | |
| 487 | sendbuff = malloc(datalen); |
| 488 | if (sendbuff == NULL) { |
| 489 | fprintf(stderr, "malloc failed\n"); |
| 490 | exit(1); |
| 491 | } |
| 492 | |
| 493 | if (icmp_sock < 0) { |
| 494 | errno = socket_errno; |
| 495 | perror("traceroute6: icmp socket"); |
| 496 | exit(1); |
| 497 | } |
| 498 | |
| 499 | #ifdef IPV6_RECVPKTINFO |
| 500 | setsockopt(icmp_sock, SOL_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on)); |
| 501 | setsockopt(icmp_sock, SOL_IPV6, IPV6_2292PKTINFO, &on, sizeof(on)); |
| 502 | #else |
| 503 | setsockopt(icmp_sock, SOL_IPV6, IPV6_PKTINFO, &on, sizeof(on)); |
| 504 | #endif |
| 505 | |
| 506 | if (options & SO_DEBUG) |
| 507 | setsockopt(icmp_sock, SOL_SOCKET, SO_DEBUG, |
| 508 | (char *)&on, sizeof(on)); |
| 509 | if (options & SO_DONTROUTE) |
| 510 | setsockopt(icmp_sock, SOL_SOCKET, SO_DONTROUTE, |
| 511 | (char *)&on, sizeof(on)); |
| 512 | |
| 513 | #ifdef __linux__ |
| 514 | on = 2; |
| 515 | if (setsockopt(icmp_sock, SOL_RAW, IPV6_CHECKSUM, &on, sizeof(on)) < 0) { |
| 516 | /* checksum should be enabled by default and setting this |
| 517 | * option might fail anyway. |
| 518 | */ |
| 519 | fprintf(stderr, "setsockopt(RAW_CHECKSUM) failed - try to continue."); |
| 520 | } |
| 521 | #endif |
| 522 | |
| 523 | if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { |
| 524 | perror("traceroute: UDP socket"); |
| 525 | exit(5); |
| 526 | } |
| 527 | #ifdef SO_SNDBUF |
| 528 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen, |
| 529 | sizeof(datalen)) < 0) { |
| 530 | perror("traceroute: SO_SNDBUF"); |
| 531 | exit(6); |
| 532 | } |
| 533 | #endif /* SO_SNDBUF */ |
| 534 | |
| 535 | if (options & SO_DEBUG) |
| 536 | (void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, |
| 537 | (char *)&on, sizeof(on)); |
| 538 | if (options & SO_DONTROUTE) |
| 539 | (void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, |
| 540 | (char *)&on, sizeof(on)); |
| 541 | |
| 542 | if (source == NULL) { |
| 543 | socklen_t alen; |
| 544 | int probe_fd = socket(AF_INET6, SOCK_DGRAM, 0); |
| 545 | |
| 546 | if (probe_fd < 0) { |
| 547 | perror("socket"); |
| 548 | exit(1); |
| 549 | } |
| 550 | if (device) { |
| 551 | if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1) |
| 552 | perror("WARNING: interface is ignored"); |
| 553 | } |
| 554 | firsthop.sin6_port = htons(1025); |
| 555 | if (connect(probe_fd, (struct sockaddr*)&firsthop, sizeof(firsthop)) == -1) { |
| 556 | perror("connect"); |
| 557 | exit(1); |
| 558 | } |
| 559 | alen = sizeof(saddr); |
| 560 | if (getsockname(probe_fd, (struct sockaddr*)&saddr, &alen) == -1) { |
| 561 | perror("getsockname"); |
| 562 | exit(1); |
| 563 | } |
| 564 | saddr.sin6_port = 0; |
| 565 | close(probe_fd); |
| 566 | } else { |
| 567 | (void) memset((char *)&saddr, 0, sizeof(saddr)); |
| 568 | saddr.sin6_family = AF_INET6; |
| 569 | if (inet_pton(AF_INET6, source, &saddr.sin6_addr) <= 0) |
| 570 | { |
| 571 | Printf("traceroute: unknown addr %s\n", source); |
| 572 | exit(1); |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | if (bind(sndsock, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) { |
| 577 | perror ("traceroute: bind sending socket"); |
| 578 | exit (1); |
| 579 | } |
| 580 | if (bind(icmp_sock, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) { |
| 581 | perror ("traceroute: bind icmp6 socket"); |
| 582 | exit (1); |
| 583 | } |
| 584 | |
| 585 | Fprintf(stderr, "traceroute to %s (%s)", hostname, |
| 586 | inet_ntop(AF_INET6, &to->sin6_addr, pa, sizeof(pa))); |
| 587 | |
| 588 | Fprintf(stderr, " from %s", |
| 589 | inet_ntop(AF_INET6, &saddr.sin6_addr, pa, sizeof(pa))); |
| 590 | Fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, datalen); |
| 591 | (void) fflush(stderr); |
| 592 | |
| 593 | for (ttl = 1; ttl <= max_ttl; ++ttl) { |
| 594 | struct in6_addr lastaddr = {{{0,}}}; |
| 595 | int got_there = 0; |
| 596 | int unreachable = 0; |
| 597 | |
| 598 | Printf("%2d ", ttl); |
| 599 | for (probe = 0; probe < nprobes; ++probe) { |
| 600 | int cc, reset_timer; |
| 601 | struct timeval t1, t2; |
| 602 | struct timezone tz; |
| 603 | struct in6_addr to; |
| 604 | |
| 605 | gettimeofday(&t1, &tz); |
| 606 | send_probe(++seq, ttl); |
| 607 | reset_timer = 1; |
| 608 | |
| 609 | while ((cc = wait_for_reply(icmp_sock, &from, &to, reset_timer)) != 0) { |
| 610 | gettimeofday(&t2, &tz); |
| 611 | if ((i = packet_ok(packet, cc, &from, &to, seq, &t1))) { |
| 612 | reset_timer = 1; |
| 613 | if (memcmp(&from.sin6_addr, &lastaddr, sizeof(from.sin6_addr))) { |
| 614 | print(packet, cc, &from); |
| 615 | memcpy(&lastaddr, |
| 616 | &from.sin6_addr, |
| 617 | sizeof(lastaddr)); |
| 618 | } |
| 619 | Printf(" %g ms", deltaT(&t1, &t2)); |
| 620 | switch(i - 1) { |
| 621 | case ICMP6_DST_UNREACH_NOPORT: |
| 622 | ++got_there; |
| 623 | break; |
| 624 | |
| 625 | case ICMP6_DST_UNREACH_NOROUTE: |
| 626 | ++unreachable; |
| 627 | Printf(" !N"); |
| 628 | break; |
| 629 | case ICMP6_DST_UNREACH_ADDR: |
| 630 | ++unreachable; |
| 631 | Printf(" !H"); |
| 632 | break; |
| 633 | |
| 634 | case ICMP6_DST_UNREACH_ADMIN: |
| 635 | ++unreachable; |
| 636 | Printf(" !S"); |
| 637 | break; |
| 638 | } |
| 639 | break; |
| 640 | } else |
| 641 | reset_timer = 0; |
| 642 | } |
| 643 | if (cc <= 0) |
| 644 | Printf(" *"); |
| 645 | (void) fflush(stdout); |
| 646 | } |
| 647 | putchar('\n'); |
| 648 | if (got_there || |
| 649 | (unreachable > 0 && unreachable >= nprobes-1)) |
| 650 | exit(0); |
| 651 | } |
| 652 | |
| 653 | return 0; |
| 654 | } |
| 655 | |
| 656 | int |
| 657 | wait_for_reply(sock, from, to, reset_timer) |
| 658 | int sock; |
| 659 | struct sockaddr_in6 *from; |
| 660 | struct in6_addr *to; |
| 661 | int reset_timer; |
| 662 | { |
| 663 | fd_set fds; |
| 664 | static struct timeval wait; |
| 665 | int cc = 0; |
| 666 | char cbuf[512]; |
| 667 | |
| 668 | FD_ZERO(&fds); |
| 669 | FD_SET(sock, &fds); |
| 670 | if (reset_timer) { |
| 671 | /* |
| 672 | * traceroute could hang if someone else has a ping |
| 673 | * running and our ICMP reply gets dropped but we don't |
| 674 | * realize it because we keep waking up to handle those |
| 675 | * other ICMP packets that keep coming in. To fix this, |
| 676 | * "reset_timer" will only be true if the last packet that |
| 677 | * came in was for us or if this is the first time we're |
| 678 | * waiting for a reply since sending out a probe. Note |
| 679 | * that this takes advantage of the select() feature on |
| 680 | * Linux where the remaining timeout is written to the |
| 681 | * struct timeval area. |
| 682 | */ |
| 683 | wait.tv_sec = waittime; |
| 684 | wait.tv_usec = 0; |
| 685 | } |
| 686 | |
| 687 | if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0) { |
| 688 | struct iovec iov; |
| 689 | struct msghdr msg; |
| 690 | iov.iov_base = packet; |
| 691 | iov.iov_len = sizeof(packet); |
| 692 | msg.msg_name = (void *)from; |
| 693 | msg.msg_namelen = sizeof(*from); |
| 694 | msg.msg_iov = &iov; |
| 695 | msg.msg_iovlen = 1; |
| 696 | msg.msg_flags = 0; |
| 697 | msg.msg_control = cbuf; |
| 698 | msg.msg_controllen = sizeof(cbuf); |
| 699 | |
| 700 | cc = recvmsg(icmp_sock, &msg, 0); |
| 701 | if (cc >= 0) { |
| 702 | struct cmsghdr *cmsg; |
| 703 | struct in6_pktinfo *ipi; |
| 704 | |
| 705 | for (cmsg = CMSG_FIRSTHDR(&msg); |
| 706 | cmsg; |
| 707 | cmsg = CMSG_NXTHDR(&msg, cmsg)) { |
| 708 | if (cmsg->cmsg_level != SOL_IPV6) |
| 709 | continue; |
| 710 | switch (cmsg->cmsg_type) { |
| 711 | case IPV6_PKTINFO: |
| 712 | #ifdef IPV6_2292PKTINFO |
| 713 | case IPV6_2292PKTINFO: |
| 714 | #endif |
| 715 | ipi = (struct in6_pktinfo *)CMSG_DATA(cmsg); |
| 716 | memcpy(to, ipi, sizeof(*to)); |
| 717 | } |
| 718 | } |
| 719 | } |
| 720 | } |
| 721 | |
| 722 | return(cc); |
| 723 | } |
| 724 | |
| 725 | |
| 726 | void send_probe(int seq, int ttl) |
| 727 | { |
| 728 | struct pkt_format *pkt = (struct pkt_format *) sendbuff; |
| 729 | int i; |
| 730 | |
| 731 | pkt->ident = htonl(ident); |
| 732 | pkt->seq = htonl(seq); |
| 733 | gettimeofday(&pkt->tv, &tz); |
| 734 | |
| 735 | i = setsockopt(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl)); |
| 736 | if (i < 0) |
| 737 | { |
| 738 | perror("setsockopt"); |
| 739 | exit(1); |
| 740 | } |
| 741 | |
| 742 | do { |
| 743 | i = sendto(sndsock, sendbuff, datalen, 0, |
| 744 | (struct sockaddr *)&whereto, sizeof(whereto)); |
| 745 | } while (i<0 && errno == ECONNREFUSED); |
| 746 | |
| 747 | if (i < 0 || i != datalen) { |
| 748 | if (i<0) |
| 749 | perror("sendto"); |
| 750 | Printf("traceroute: wrote %s %d chars, ret=%d\n", hostname, |
| 751 | datalen, i); |
| 752 | (void) fflush(stdout); |
| 753 | } |
| 754 | } |
| 755 | |
| 756 | |
| 757 | double deltaT(struct timeval *t1p, struct timeval *t2p) |
| 758 | { |
| 759 | register double dt; |
| 760 | |
| 761 | dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 + |
| 762 | (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0; |
| 763 | return (dt); |
| 764 | } |
| 765 | |
| 766 | |
| 767 | /* |
| 768 | * Convert an ICMP "type" field to a printable string. |
| 769 | */ |
| 770 | char * pr_type(unsigned char t) |
| 771 | { |
| 772 | switch(t) { |
| 773 | /* Unknown */ |
| 774 | case 0: |
| 775 | return "Error"; |
| 776 | case 1: |
| 777 | /* ICMP6_DST_UNREACH: */ |
| 778 | return "Destination Unreachable"; |
| 779 | case 2: |
| 780 | /* ICMP6_PACKET_TOO_BIG: */ |
| 781 | return "Packet Too Big"; |
| 782 | case 3: |
| 783 | /* ICMP6_TIME_EXCEEDED */ |
| 784 | return "Time Exceeded in Transit"; |
| 785 | case 4: |
| 786 | /* ICMP6_PARAM_PROB */ |
| 787 | return "Parameter Problem"; |
| 788 | case 128: |
| 789 | /* ICMP6_ECHO_REQUEST */ |
| 790 | return "Echo Request"; |
| 791 | case 129: |
| 792 | /* ICMP6_ECHO_REPLY */ |
| 793 | return "Echo Reply"; |
| 794 | case 130: |
| 795 | /* ICMP6_MEMBERSHIP_QUERY */ |
| 796 | return "Membership Query"; |
| 797 | case 131: |
| 798 | /* ICMP6_MEMBERSHIP_REPORT */ |
| 799 | return "Membership Report"; |
| 800 | case 132: |
| 801 | /* ICMP6_MEMBERSHIP_REDUCTION */ |
| 802 | return "Membership Reduction"; |
| 803 | case 133: |
| 804 | /* ND_ROUTER_SOLICIT */ |
| 805 | return "Router Solicitation"; |
| 806 | case 134: |
| 807 | /* ND_ROUTER_ADVERT */ |
| 808 | return "Router Advertisement"; |
| 809 | case 135: |
| 810 | /* ND_NEIGHBOR_SOLICIT */ |
| 811 | return "Neighbor Solicitation"; |
| 812 | case 136: |
| 813 | /* ND_NEIGHBOR_ADVERT */ |
| 814 | return "Neighbor Advertisement"; |
| 815 | case 137: |
| 816 | /* ND_REDIRECT */ |
| 817 | return "Redirect"; |
| 818 | } |
| 819 | |
| 820 | return("OUT-OF-RANGE"); |
| 821 | } |
| 822 | |
| 823 | |
| 824 | int packet_ok(u_char *buf, int cc, struct sockaddr_in6 *from, |
| 825 | struct in6_addr *to, int seq, |
| 826 | struct timeval *tv) |
| 827 | { |
| 828 | struct icmp6_hdr *icp; |
| 829 | u_char type, code; |
| 830 | |
| 831 | icp = (struct icmp6_hdr *) buf; |
| 832 | |
| 833 | type = icp->icmp6_type; |
| 834 | code = icp->icmp6_code; |
| 835 | |
| 836 | if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT) || |
| 837 | type == ICMP6_DST_UNREACH) |
| 838 | { |
| 839 | struct ip6_hdr *hip; |
| 840 | struct udphdr *up; |
| 841 | int nexthdr; |
| 842 | |
| 843 | hip = (struct ip6_hdr *) (icp + 1); |
| 844 | up = (struct udphdr *)(hip+1); |
| 845 | nexthdr = hip->ip6_nxt; |
| 846 | |
| 847 | if (nexthdr == 44) { |
| 848 | nexthdr = *(unsigned char*)up; |
| 849 | up++; |
| 850 | } |
| 851 | if (nexthdr == IPPROTO_UDP) |
| 852 | { |
| 853 | struct pkt_format *pkt; |
| 854 | |
| 855 | pkt = (struct pkt_format *) (up + 1); |
| 856 | |
| 857 | if (ntohl(pkt->ident) == ident && |
| 858 | ntohl(pkt->seq) == seq) |
| 859 | { |
| 860 | *tv = pkt->tv; |
| 861 | return (type == ICMP6_TIME_EXCEEDED ? -1 : code+1); |
| 862 | } |
| 863 | } |
| 864 | |
| 865 | } |
| 866 | |
| 867 | if (verbose) { |
| 868 | unsigned char *p; |
| 869 | char pa1[MAX_HOSTNAMELEN]; |
| 870 | char pa2[MAX_HOSTNAMELEN]; |
| 871 | int i; |
| 872 | |
| 873 | p = (unsigned char *) (icp + 1); |
| 874 | |
| 875 | Printf("\n%d bytes from %s to %s", cc, |
| 876 | inet_ntop(AF_INET6, &from->sin6_addr, pa1, sizeof(pa1)), |
| 877 | inet_ntop(AF_INET6, to, pa2, sizeof(pa2))); |
| 878 | |
| 879 | Printf(": icmp type %d (%s) code %d\n", type, pr_type(type), |
| 880 | icp->icmp6_code); |
| 881 | |
| 882 | cc -= sizeof(struct icmp6_hdr); |
| 883 | for (i = 0; i < cc ; i++) { |
| 884 | if (i % 16 == 0) |
| 885 | Printf("%04x:", i); |
| 886 | if (i % 4 == 0) |
| 887 | Printf(" "); |
| 888 | Printf("%02x", 0xff & (unsigned)p[i]); |
| 889 | if (i % 16 == 15 && i + 1 < cc) |
| 890 | Printf("\n"); |
| 891 | } |
| 892 | Printf("\n"); |
| 893 | } |
| 894 | |
| 895 | return(0); |
| 896 | } |
| 897 | |
| 898 | |
| 899 | void print(unsigned char *buf, int cc, struct sockaddr_in6 *from) |
| 900 | { |
| 901 | char pa[MAX_HOSTNAMELEN]; |
| 902 | |
| 903 | if (nflag) |
| 904 | Printf(" %s", inet_ntop(AF_INET6, &from->sin6_addr, |
| 905 | pa, sizeof(pa))); |
| 906 | else |
| 907 | { |
| 908 | const char *hostname; |
| 909 | struct hostent *hp; |
| 910 | char *s = NULL; |
| 911 | |
| 912 | hostname = inet_ntop(AF_INET6, &from->sin6_addr, pa, sizeof(pa)); |
| 913 | |
| 914 | if ((hp = gethostbyaddr((char *)&from->sin6_addr, |
| 915 | sizeof(from->sin6_addr), AF_INET6))) { |
| 916 | #ifdef USE_IDN |
| 917 | if (idna_to_unicode_lzlz(hp->h_name, &s, 0) != IDNA_SUCCESS) |
| 918 | s = NULL; |
| 919 | #endif |
| 920 | } |
| 921 | |
| 922 | Printf(" %s (%s)", hp ? (s ? s : hp->h_name) : hostname, pa); |
| 923 | |
| 924 | free(s); |
| 925 | } |
| 926 | } |
| 927 | |
| 928 | |
| 929 | /* |
| 930 | * Subtract 2 timeval structs: out = out - in. |
| 931 | * Out is assumed to be >= in. |
| 932 | */ |
| 933 | void |
| 934 | tvsub(out, in) |
| 935 | register struct timeval *out, *in; |
| 936 | { |
| 937 | if ((out->tv_usec -= in->tv_usec) < 0) { |
| 938 | out->tv_sec--; |
| 939 | out->tv_usec += 1000000; |
| 940 | } |
| 941 | out->tv_sec -= in->tv_sec; |
| 942 | } |
| 943 | |
| 944 | void usage(void) |
| 945 | { |
| 946 | fprintf(stderr, |
| 947 | "Usage: traceroute6 [-dnrvV] [-m max_ttl] [-p port#] [-q nqueries]\n\t\ |
| 948 | [-s src_addr] [-t tos] [-w wait] host [data size]\n"); |
| 949 | exit(1); |
| 950 | } |