39865d6488
getipnodebyaddr(). This resolve 2 problems. -can specify scope index(@ifname) for IPv6 link local addr -reverse lookup for IPv6 loopback addr(::1) was strange, but fixed
1066 lines
31 KiB
C
1066 lines
31 KiB
C
/*
|
|
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
|
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* All rights reserved.
|
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*
|
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* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
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* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the project nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
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*
|
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
|
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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|
*/
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|
|
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
|
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* This code is derived from software contributed to Berkeley by
|
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* Van Jacobson.
|
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*
|
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* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by the University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
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#ifndef lint
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static char copyright[] =
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"@(#) Copyright (c) 1990, 1993\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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|
|
#ifndef lint
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static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
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#endif /* not lint */
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|
|
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/*
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* traceroute host - trace the route ip packets follow going to "host".
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*
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* Attempt to trace the route an ip packet would follow to some
|
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* internet host. We find out intermediate hops by launching probe
|
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* packets with a small ttl (time to live) then listening for an
|
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* icmp "time exceeded" reply from a gateway. We start our probes
|
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* with a ttl of one and increase by one until we get an icmp "port
|
|
* unreachable" (which means we got to "host") or hit a max (which
|
|
* defaults to 30 hops & can be changed with the -m flag). Three
|
|
* probes (change with -q flag) are sent at each ttl setting and a
|
|
* line is printed showing the ttl, address of the gateway and
|
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* round trip time of each probe. If the probe answers come from
|
|
* different gateways, the address of each responding system will
|
|
* be printed. If there is no response within a 5 sec. timeout
|
|
* interval (changed with the -w flag), a "*" is printed for that
|
|
* probe.
|
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*
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* Probe packets are UDP format. We don't want the destination
|
|
* host to process them so the destination port is set to an
|
|
* unlikely value (if some clod on the destination is using that
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|
* value, it can be changed with the -p flag).
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*
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* A sample use might be:
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*
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* [yak 71]% traceroute nis.nsf.net.
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* traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
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* 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
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* 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
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|
* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
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|
* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
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|
* 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
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|
* 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
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* 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
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* 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
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|
* 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
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* 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
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* 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
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*
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|
* Note that lines 2 & 3 are the same. This is due to a buggy
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* kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
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* packets with a zero ttl.
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*
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|
* A more interesting example is:
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*
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* [yak 72]% traceroute allspice.lcs.mit.edu.
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* traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
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* 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
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* 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
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* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
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* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
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* 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
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* 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
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* 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
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* 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
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* 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
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* 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
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* 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
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* 12 * * *
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* 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
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* 14 * * *
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* 15 * * *
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* 16 * * *
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* 17 * * *
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* 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
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*
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* (I start to see why I'm having so much trouble with mail to
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* MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
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* either don't send ICMP "time exceeded" messages or send them
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* with a ttl too small to reach us. 14 - 17 are running the
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* MIT C Gateway code that doesn't send "time exceeded"s. God
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* only knows what's going on with 12.
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*
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* The silent gateway 12 in the above may be the result of a bug in
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* the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
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|
* sends an unreachable message using whatever ttl remains in the
|
|
* original datagram. Since, for gateways, the remaining ttl is
|
|
* zero, the icmp "time exceeded" is guaranteed to not make it back
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|
* to us. The behavior of this bug is slightly more interesting
|
|
* when it appears on the destination system:
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*
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|
* 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
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|
* 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
|
|
* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
|
|
* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
|
|
* 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
|
|
* 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
|
|
* 7 * * *
|
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* 8 * * *
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* 9 * * *
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* 10 * * *
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* 11 * * *
|
|
* 12 * * *
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|
* 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
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*
|
|
* Notice that there are 12 "gateways" (13 is the final
|
|
* destination) and exactly the last half of them are "missing".
|
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* What's really happening is that rip (a Sun-3 running Sun OS3.5)
|
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* is using the ttl from our arriving datagram as the ttl in its
|
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* icmp reply. So, the reply will time out on the return path
|
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* (with no notice sent to anyone since icmp's aren't sent for
|
|
* icmp's) until we probe with a ttl that's at least twice the path
|
|
* length. I.e., rip is really only 7 hops away. A reply that
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* returns with a ttl of 1 is a clue this problem exists.
|
|
* Traceroute prints a "!" after the time if the ttl is <= 1.
|
|
* Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
|
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* non-standard (HPUX) software, expect to see this problem
|
|
* frequently and/or take care picking the target host of your
|
|
* probes.
|
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*
|
|
* Other possible annotations after the time are !H, !N, !P (got a host,
|
|
* network or protocol unreachable, respectively), !S or !F (source
|
|
* route failed or fragmentation needed -- neither of these should
|
|
* ever occur and the associated gateway is busted if you see one). If
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* almost all the probes result in some kind of unreachable, traceroute
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* will give up and exit.
|
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*
|
|
* Notes
|
|
* -----
|
|
* This program must be run by root or be setuid. (I suggest that
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|
* you *don't* make it setuid -- casual use could result in a lot
|
|
* of unnecessary traffic on our poor, congested nets.)
|
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*
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* This program requires a kernel mod that does not appear in any
|
|
* system available from Berkeley: A raw ip socket using proto
|
|
* IPPROTO_RAW must interpret the data sent as an ip datagram (as
|
|
* opposed to data to be wrapped in a ip datagram). See the README
|
|
* file that came with the source to this program for a description
|
|
* of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
|
|
* vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
|
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* MODIFIED TO RUN THIS PROGRAM.
|
|
*
|
|
* The udp port usage may appear bizarre (well, ok, it is bizarre).
|
|
* The problem is that an icmp message only contains 8 bytes of
|
|
* data from the original datagram. 8 bytes is the size of a udp
|
|
* header so, if we want to associate replies with the original
|
|
* datagram, the necessary information must be encoded into the
|
|
* udp header (the ip id could be used but there's no way to
|
|
* interlock with the kernel's assignment of ip id's and, anyway,
|
|
* it would have taken a lot more kernel hacking to allow this
|
|
* code to set the ip id). So, to allow two or more users to
|
|
* use traceroute simultaneously, we use this task's pid as the
|
|
* source port (the high bit is set to move the port number out
|
|
* of the "likely" range). To keep track of which probe is being
|
|
* replied to (so times and/or hop counts don't get confused by a
|
|
* reply that was delayed in transit), we increment the destination
|
|
* port number before each probe.
|
|
*
|
|
* Don't use this as a coding example. I was trying to find a
|
|
* routing problem and this code sort-of popped out after 48 hours
|
|
* without sleep. I was amazed it ever compiled, much less ran.
|
|
*
|
|
* I stole the idea for this program from Steve Deering. Since
|
|
* the first release, I've learned that had I attended the right
|
|
* IETF working group meetings, I also could have stolen it from Guy
|
|
* Almes or Matt Mathis. I don't know (or care) who came up with
|
|
* the idea first. I envy the originators' perspicacity and I'm
|
|
* glad they didn't keep the idea a secret.
|
|
*
|
|
* Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
|
|
* enhancements to the original distribution.
|
|
*
|
|
* I've hacked up a round-trip-route version of this that works by
|
|
* sending a loose-source-routed udp datagram through the destination
|
|
* back to yourself. Unfortunately, SO many gateways botch source
|
|
* routing, the thing is almost worthless. Maybe one day...
|
|
*
|
|
* -- Van Jacobson (van@helios.ee.lbl.gov)
|
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* Tue Dec 20 03:50:13 PST 1988
|
|
*/
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/time.h>
|
|
#include <sys/socket.h>
|
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#include <sys/uio.h>
|
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#include <sys/file.h>
|
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#include <sys/ioctl.h>
|
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|
|
#include <netinet/in.h>
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|
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#include <arpa/inet.h>
|
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|
|
#include <netdb.h>
|
|
#include <stdio.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
|
|
#include <netinet/ip6.h>
|
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#include <netinet/icmp6.h>
|
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#include <netinet/udp.h>
|
|
|
|
#ifdef IPSEC
|
|
#include <net/route.h>
|
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#include <netinet6/ipsec.h>
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#endif
|
|
|
|
#define freehostent(hp)
|
|
#define DUMMY_PORT 10010
|
|
|
|
#define MAXPACKET 65535 /* max ip packet size */
|
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN 64
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#endif
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|
|
|
#ifndef FD_SET
|
|
#define NFDBITS (8*sizeof(fd_set))
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#define FD_SETSIZE NFDBITS
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#define FD_SET(n, p) ((p)->fds_bits[(n)/NFDBITS] |= (1 << ((n) % NFDBITS)))
|
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#define FD_CLR(n, p) ((p)->fds_bits[(n)/NFDBITS] &= ~(1 << ((n) % NFDBITS)))
|
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#define FD_ISSET(n, p) ((p)->fds_bits[(n)/NFDBITS] & (1 << ((n) % NFDBITS)))
|
|
#define FD_ZERO(p) bzero((char *)(p), sizeof(*(p)))
|
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#endif
|
|
|
|
#define Fprintf (void)fprintf
|
|
#define Sprintf (void)sprintf
|
|
#define Printf (void)printf
|
|
|
|
/*
|
|
* format of a (udp) probe packet.
|
|
*/
|
|
struct opacket {
|
|
u_char seq; /* sequence number of this packet */
|
|
u_char hops; /* hop limit of the packet */
|
|
struct timeval tv; /* time packet left */
|
|
};
|
|
|
|
u_char packet[512]; /* last inbound (icmp) packet */
|
|
struct opacket *outpacket; /* last output (udp) packet */
|
|
|
|
int main __P((int, char *[]));
|
|
int wait_for_reply __P((int, struct msghdr *));
|
|
int setpolicy __P((int so, char *policy));
|
|
void send_probe __P((int, int));
|
|
struct udphdr *get_udphdr __P((struct ip6_hdr *, u_char *));
|
|
int get_hoplim __P((struct msghdr *));
|
|
double deltaT __P((struct timeval *, struct timeval *));
|
|
char *pr_type __P((int));
|
|
int packet_ok __P((struct msghdr *, int, int));
|
|
void print __P((struct msghdr *, int));
|
|
void tvsub __P((struct timeval *, struct timeval *));
|
|
char *inetname __P((struct in6_addr *));
|
|
void usage __P((void));
|
|
|
|
int rcvsock; /* receive (icmp) socket file descriptor */
|
|
int sndsock; /* send (udp) socket file descriptor */
|
|
struct timezone tz; /* leftover */
|
|
|
|
struct msghdr rcvmhdr;
|
|
struct iovec rcviov[2];
|
|
int rcvhlim;
|
|
struct in6_pktinfo *rcvpktinfo;
|
|
|
|
struct sockaddr_in6 Src, Dst, Rcv;
|
|
struct sockaddr_in6 *src = &Src, *dst = &Dst, *rcv = &Rcv;
|
|
int datalen; /* How much data */
|
|
char rtbuf[1024]; /*XXX*/
|
|
struct cmsghdr *cmsg;
|
|
|
|
char *source = 0;
|
|
char *hostname;
|
|
|
|
int nprobes = 3;
|
|
int max_hops = 30;
|
|
u_short ident;
|
|
u_short port = 32768+666; /* start udp dest port # for probe packets */
|
|
int options; /* socket options */
|
|
int verbose;
|
|
int waittime = 5; /* time to wait for response (in seconds) */
|
|
int nflag; /* print addresses numerically */
|
|
int lflag; /* print both numerical address & hostname */
|
|
|
|
char ntop_buf[INET6_ADDRSTRLEN]; /* for inet_ntop() */
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
extern char *optarg;
|
|
extern int optind;
|
|
struct hostent *hp;
|
|
struct addrinfo hints, *res;
|
|
int error;
|
|
int ch, i, on, probe, seq, hops;
|
|
static u_char rcvcmsgbuf[CMSG_SPACE(sizeof(struct in6_pktinfo))
|
|
+ CMSG_SPACE(sizeof(int))];
|
|
|
|
on = 1;
|
|
seq = 0;
|
|
|
|
while ((ch = getopt(argc, argv, "dlm:np:q:rs:w:vg:")) != EOF)
|
|
switch(ch) {
|
|
case 'd':
|
|
options |= SO_DEBUG;
|
|
break;
|
|
case 'l':
|
|
lflag++;
|
|
break;
|
|
case 'g':
|
|
hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
|
|
if (hp == NULL) {
|
|
Fprintf(stderr,
|
|
"traceroute6: unknown host %s\n", optarg);
|
|
exit(1);
|
|
}
|
|
if (cmsg == NULL)
|
|
cmsg = inet6_rthdr_init(rtbuf, IPV6_RTHDR_TYPE_0);
|
|
inet6_rthdr_add(cmsg, (struct in6_addr *)hp->h_addr, IPV6_RTHDR_LOOSE);
|
|
break;
|
|
case 'm':
|
|
max_hops = atoi(optarg);
|
|
if (max_hops <= 1) {
|
|
Fprintf(stderr,
|
|
"traceroute6: max hoplimit must be >1.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'n':
|
|
nflag++;
|
|
break;
|
|
case 'p':
|
|
port = atoi(optarg);
|
|
if (port < 1) {
|
|
Fprintf(stderr,
|
|
"traceroute6: port must be >0.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'q':
|
|
nprobes = atoi(optarg);
|
|
if (nprobes < 1) {
|
|
Fprintf(stderr,
|
|
"traceroute6: nprobes must be >0.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'r':
|
|
options |= SO_DONTROUTE;
|
|
break;
|
|
case 's':
|
|
/*
|
|
* set the ip source address of the outbound
|
|
* probe (e.g., on a multi-homed host).
|
|
*/
|
|
source = optarg;
|
|
break;
|
|
case 'v':
|
|
verbose++;
|
|
break;
|
|
case 'w':
|
|
waittime = atoi(optarg);
|
|
if (waittime <= 1) {
|
|
Fprintf(stderr,
|
|
"traceroute6: wait must be >1 sec.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc < 1)
|
|
usage();
|
|
|
|
setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = PF_INET6;
|
|
hints.ai_socktype = SOCK_RAW;
|
|
hints.ai_protocol = IPPROTO_ICMPV6;
|
|
hints.ai_flags = AI_CANONNAME;
|
|
error = getaddrinfo(*argv, NULL, &hints, &res);
|
|
if (error) {
|
|
(void)fprintf(stderr,
|
|
"traceroute6: %s\n", gai_strerror(error));
|
|
if (error == EAI_SYSTEM)
|
|
(void)fprintf(stderr,
|
|
"traceroute6: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (!res->ai_addr)
|
|
errx(1, "getaddrinfo failed");
|
|
memcpy(&Dst, res->ai_addr, res->ai_addrlen);
|
|
hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
|
|
freeaddrinfo(res);
|
|
|
|
if (*++argv)
|
|
datalen = atoi(*argv);
|
|
if (datalen < 0 || datalen >= MAXPACKET - sizeof(struct opacket)) {
|
|
Fprintf(stderr,
|
|
"traceroute6: packet size must be 0 <= s < %ld.\n",
|
|
(long)(MAXPACKET - sizeof(struct opacket)));
|
|
exit(1);
|
|
}
|
|
datalen += sizeof(struct opacket);
|
|
outpacket = (struct opacket *)malloc((unsigned)datalen);
|
|
if (! outpacket) {
|
|
perror("traceroute6: malloc");
|
|
exit(1);
|
|
}
|
|
(void) bzero((char *)outpacket, datalen);
|
|
|
|
/*
|
|
* Receive ICMP
|
|
*/
|
|
if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
|
|
perror("traceroute6: icmp socket");
|
|
exit(5);
|
|
}
|
|
/* initialize msghdr for receiving packets */
|
|
rcviov[0].iov_base = (caddr_t)packet;
|
|
rcviov[0].iov_len = sizeof(packet);
|
|
rcvmhdr.msg_name = (caddr_t)rcv;
|
|
rcvmhdr.msg_namelen = sizeof(*rcv);
|
|
rcvmhdr.msg_iov = rcviov;
|
|
rcvmhdr.msg_iovlen = 1;
|
|
rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
|
|
rcvmhdr.msg_controllen = sizeof(rcvcmsgbuf);
|
|
|
|
/* specify to tell receiving interface */
|
|
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
|
|
sizeof(on)) < 0)
|
|
err(1, "setsockopt(IPV6_PKTINFO)");
|
|
|
|
/* specify to tell value of hoplimit field of received IP6 hdr */
|
|
if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
|
|
sizeof(on)) < 0)
|
|
err(1, "setsockopt(IPV6_HOPLIMIT)");
|
|
|
|
if (options & SO_DEBUG)
|
|
(void) setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
|
|
(char *)&on, sizeof(on));
|
|
if (options & SO_DONTROUTE)
|
|
(void) setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
|
|
(char *)&on, sizeof(on));
|
|
#ifdef IPSEC
|
|
#ifdef IPSEC_POLICY_IPSEC
|
|
/*
|
|
* do not raise error even if setsockopt fails, kernel may have ipsec
|
|
* turned off.
|
|
*/
|
|
if (setpolicy(rcvsock, "in bypass") < 0)
|
|
errx(1, ipsec_strerror());
|
|
if (setpolicy(rcvsock, "out bypass") < 0)
|
|
errx(1, ipsec_strerror());
|
|
#endif /*IPSEC_POLICY_IPSEC*/
|
|
#endif /*IPSEC*/
|
|
|
|
/*
|
|
* Send UDP
|
|
*/
|
|
if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
|
|
perror("traceroute6: udp socket");
|
|
exit(5);
|
|
}
|
|
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
|
|
sizeof(datalen)) < 0) {
|
|
perror("traceroute6: SO_SNDBUF");
|
|
exit(6);
|
|
}
|
|
if (options & SO_DEBUG)
|
|
(void) setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
|
|
(char *)&on, sizeof(on));
|
|
if (options & SO_DONTROUTE)
|
|
(void) setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
|
|
(char *)&on, sizeof(on));
|
|
if (cmsg != NULL) {
|
|
inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
|
|
(void) setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
|
|
rtbuf, cmsg->cmsg_len);
|
|
}
|
|
#ifdef IPSEC
|
|
#ifdef IPSEC_POLICY_IPSEC
|
|
/*
|
|
* do not raise error even if setsockopt fails, kernel may have ipsec
|
|
* turned off.
|
|
*/
|
|
if (setpolicy(sndsock, "in bypass") < 0)
|
|
errx(1, ipsec_strerror());
|
|
if (setpolicy(sndsock, "out bypass") < 0)
|
|
errx(1, ipsec_strerror());
|
|
#endif /*IPSEC_POLICY_IPSEC*/
|
|
#endif /*IPSEC*/
|
|
|
|
/*
|
|
* Source selection
|
|
*/
|
|
bzero((char *)src, sizeof(Src));
|
|
if (source) {
|
|
if (inet_pton(AF_INET6, source, &Src.sin6_addr) != 1) {
|
|
Printf("traceroute6: unknown host %s\n", source);
|
|
exit(1);
|
|
}
|
|
} else {
|
|
struct sockaddr_in6 Nxt;
|
|
int dummy, len;
|
|
|
|
len = sizeof(Src);
|
|
Nxt = Dst;
|
|
Nxt.sin6_port = htons(DUMMY_PORT);
|
|
if (cmsg != NULL)
|
|
bcopy(inet6_rthdr_getaddr(cmsg, 1), &Nxt.sin6_addr,
|
|
sizeof(Nxt.sin6_addr));
|
|
if ((dummy = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
|
|
perror("socket") ;
|
|
}
|
|
if(-1 == connect(dummy, (struct sockaddr *)&Nxt, sizeof(Nxt)))
|
|
perror("connect");
|
|
if(-1 == getsockname(dummy, (struct sockaddr *)src, &len)) {
|
|
perror("getsockname");
|
|
printf("%d\n", errno);
|
|
}
|
|
close(dummy) ;
|
|
}
|
|
ident = (getpid() & 0xffff) | 0x8000;
|
|
Src.sin6_family = AF_INET6;
|
|
Src.sin6_port = htons(ident);
|
|
if (bind(sndsock, (struct sockaddr *)src, sizeof(Src)) < 0){
|
|
perror ("traceroute6: bind:");
|
|
exit (1);
|
|
}
|
|
|
|
/*
|
|
* Message to users
|
|
*/
|
|
Fprintf(stderr, "traceroute to %s (%s)", hostname,
|
|
inet_ntop(AF_INET6, &Dst.sin6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
if (source)
|
|
Fprintf(stderr, " from %s", source);
|
|
Fprintf(stderr, ", %d hops max, %d byte packets\n", max_hops, datalen);
|
|
(void) fflush(stderr);
|
|
|
|
/*
|
|
* Main loop
|
|
*/
|
|
for (hops = 1; hops <= max_hops; ++hops) {
|
|
struct in6_addr lastaddr;
|
|
int got_there = 0;
|
|
int unreachable = 0;
|
|
|
|
Printf("%2d ", hops);
|
|
bzero(&lastaddr, sizeof(lastaddr));
|
|
for (probe = 0; probe < nprobes; ++probe) {
|
|
int cc;
|
|
struct timeval t1, t2;
|
|
struct timezone tz;
|
|
|
|
(void) gettimeofday(&t1, &tz);
|
|
send_probe(++seq, hops);
|
|
while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
|
|
(void) gettimeofday(&t2, &tz);
|
|
if ((i = packet_ok(&rcvmhdr, cc, seq))) {
|
|
if (! IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
|
|
&lastaddr)) {
|
|
print(&rcvmhdr, cc);
|
|
lastaddr = Rcv.sin6_addr;
|
|
}
|
|
Printf(" %g ms", deltaT(&t1, &t2));
|
|
switch(i - 1) {
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
|
++unreachable;
|
|
Printf(" !N");
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADMIN:
|
|
++unreachable;
|
|
Printf(" !P");
|
|
break;
|
|
case ICMP6_DST_UNREACH_NOTNEIGHBOR:
|
|
++unreachable;
|
|
Printf(" !S");
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADDR:
|
|
++unreachable;
|
|
Printf(" !A");
|
|
break;
|
|
case ICMP6_DST_UNREACH_NOPORT:
|
|
if (rcvhlim >= 0 &&
|
|
rcvhlim <= 1)
|
|
Printf(" !");
|
|
++got_there;
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
if (cc == 0)
|
|
Printf(" *");
|
|
(void) fflush(stdout);
|
|
}
|
|
putchar('\n');
|
|
if (got_there ||
|
|
(unreachable > 0 && unreachable >= ((nprobes + 1) / 2))) {
|
|
exit(0);
|
|
}
|
|
}
|
|
|
|
exit(0);
|
|
}
|
|
|
|
int
|
|
wait_for_reply(sock, mhdr)
|
|
int sock;
|
|
struct msghdr *mhdr;
|
|
{
|
|
fd_set fds;
|
|
struct timeval wait;
|
|
int cc = 0;
|
|
|
|
FD_ZERO(&fds);
|
|
FD_SET(sock, &fds);
|
|
wait.tv_sec = waittime; wait.tv_usec = 0;
|
|
|
|
if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0)
|
|
cc = recvmsg(rcvsock, mhdr, 0);
|
|
|
|
return(cc);
|
|
}
|
|
|
|
#ifdef IPSEC
|
|
#ifdef IPSEC_POLICY_IPSEC
|
|
int
|
|
setpolicy(so, policy)
|
|
int so;
|
|
char *policy;
|
|
{
|
|
char *buf;
|
|
|
|
buf = ipsec_set_policy(policy, strlen(policy));
|
|
if (buf == NULL) {
|
|
warnx(ipsec_strerror());
|
|
return -1;
|
|
}
|
|
(void)setsockopt(so, IPPROTO_IPV6, IPV6_IPSEC_POLICY,
|
|
buf, ipsec_get_policylen(buf));
|
|
|
|
free(buf);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
#endif
|
|
|
|
void
|
|
send_probe(seq, hops)
|
|
int seq, hops;
|
|
{
|
|
struct opacket *op = outpacket;
|
|
int i;
|
|
|
|
if(setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
|
|
(char *)&hops, sizeof(hops)) < 0) {
|
|
perror("setsockopt IPV6_UNICAST_HOPS");
|
|
}
|
|
|
|
Dst.sin6_port = htons(port + seq);
|
|
|
|
op->seq = seq;
|
|
op->hops = hops;
|
|
(void) gettimeofday(&op->tv, &tz);
|
|
|
|
i = sendto(sndsock, (char *)outpacket, datalen , 0,
|
|
(struct sockaddr *)dst, sizeof(Dst));
|
|
if (i < 0 || i != datalen) {
|
|
if (i<0)
|
|
perror("sendto");
|
|
Printf("traceroute6: wrote %s %d chars, ret=%d\n", hostname,
|
|
datalen, i);
|
|
(void) fflush(stdout);
|
|
}
|
|
}
|
|
|
|
int
|
|
get_hoplim(mhdr)
|
|
struct msghdr *mhdr;
|
|
{
|
|
struct cmsghdr *cm;
|
|
|
|
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
|
|
cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
|
|
if (cm->cmsg_level == IPPROTO_IPV6 &&
|
|
cm->cmsg_type == IPV6_HOPLIMIT &&
|
|
cm->cmsg_len == CMSG_LEN(sizeof(int)))
|
|
return(*(int *)CMSG_DATA(cm));
|
|
}
|
|
|
|
return(-1);
|
|
}
|
|
|
|
double
|
|
deltaT(t1p, t2p)
|
|
struct timeval *t1p, *t2p;
|
|
{
|
|
register double dt;
|
|
|
|
dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
|
|
(double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
|
|
return (dt);
|
|
}
|
|
|
|
|
|
/*
|
|
* Convert an ICMP "type" field to a printable string.
|
|
*/
|
|
char *
|
|
pr_type(t0)
|
|
int t0;
|
|
{
|
|
u_char t = t0 & 0xff;
|
|
char *cp;
|
|
|
|
switch (t) {
|
|
case ICMP6_DST_UNREACH:
|
|
cp = "Destination Unreachable";
|
|
break;
|
|
case ICMP6_PACKET_TOO_BIG:
|
|
cp = "Pakcet Too Big";
|
|
break;
|
|
case ICMP6_TIME_EXCEEDED:
|
|
cp = "Time Exceeded";
|
|
break;
|
|
case ICMP6_PARAM_PROB:
|
|
cp = "Parameter Problem";
|
|
break;
|
|
case ICMP6_ECHO_REQUEST:
|
|
cp = "Echo Request";
|
|
break;
|
|
case ICMP6_ECHO_REPLY:
|
|
cp = "Echo Reply";
|
|
break;
|
|
case ICMP6_MEMBERSHIP_QUERY:
|
|
cp = "Group Membership Query";
|
|
break;
|
|
case ICMP6_MEMBERSHIP_REPORT:
|
|
cp = "Group Membership Report";
|
|
break;
|
|
case ICMP6_MEMBERSHIP_REDUCTION:
|
|
cp = "Group Membership Reduction";
|
|
break;
|
|
case ND_ROUTER_SOLICIT:
|
|
cp = "Router Solicitation";
|
|
break;
|
|
case ND_ROUTER_ADVERT:
|
|
cp = "Router Advertisement";
|
|
break;
|
|
case ND_NEIGHBOR_SOLICIT:
|
|
cp = "Neighbor Solicitation";
|
|
break;
|
|
case ND_NEIGHBOR_ADVERT:
|
|
cp = "Neighbor Advertisement";
|
|
break;
|
|
case ND_REDIRECT:
|
|
cp = "Ridirect";
|
|
break;
|
|
default:
|
|
cp = "Unknown";
|
|
break;
|
|
}
|
|
return cp;
|
|
}
|
|
|
|
|
|
int
|
|
packet_ok(mhdr, cc, seq)
|
|
struct msghdr *mhdr;
|
|
int cc;
|
|
int seq;
|
|
{
|
|
register struct icmp6_hdr *icp;
|
|
struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
|
|
u_char type, code;
|
|
char *buf = (char *)mhdr->msg_iov[0].iov_base;
|
|
struct cmsghdr *cm;
|
|
int *hlimp;
|
|
|
|
if (cc < sizeof(struct icmp6_hdr)) {
|
|
if (verbose)
|
|
Printf("data too short (%d bytes) from %s\n", cc,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
return(0);
|
|
}
|
|
icp = (struct icmp6_hdr *)buf;
|
|
/* get optional information via advanced API */
|
|
rcvpktinfo = NULL;
|
|
hlimp = NULL;
|
|
for (cm = (struct cmsghdr *)CMSG_FIRSTHDR(mhdr); cm;
|
|
cm = (struct cmsghdr *)CMSG_NXTHDR(mhdr, cm)) {
|
|
if (cm->cmsg_level == IPPROTO_IPV6 &&
|
|
cm->cmsg_type == IPV6_PKTINFO &&
|
|
cm->cmsg_len ==
|
|
CMSG_LEN(sizeof(struct in6_pktinfo)))
|
|
rcvpktinfo = (struct in6_pktinfo *)(CMSG_DATA(cm));
|
|
|
|
if (cm->cmsg_level == IPPROTO_IPV6 &&
|
|
cm->cmsg_type == IPV6_HOPLIMIT &&
|
|
cm->cmsg_len == CMSG_LEN(sizeof(int)))
|
|
hlimp = (int *)CMSG_DATA(cm);
|
|
}
|
|
if (rcvpktinfo == NULL || hlimp == NULL) {
|
|
warnx("failed to get received hop limit or packet info");
|
|
return(0);
|
|
}
|
|
rcvhlim = *hlimp;
|
|
|
|
type = icp->icmp6_type;
|
|
code = icp->icmp6_code;
|
|
if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
|
|
|| type == ICMP6_DST_UNREACH) {
|
|
struct ip6_hdr *hip;
|
|
struct udphdr *up;
|
|
|
|
hip = (struct ip6_hdr *)(icp + 1);
|
|
if ((up = get_udphdr(hip, (u_char *)(buf + cc))) == NULL) {
|
|
if (verbose)
|
|
warnx("failed to get upper layer header");
|
|
return(0);
|
|
}
|
|
if (up->uh_sport == htons(ident) &&
|
|
up->uh_dport == htons(port+seq))
|
|
return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
|
|
}
|
|
if (verbose) {
|
|
int i;
|
|
u_long *lp = (u_long *)(icp + 1);
|
|
char sbuf[INET6_ADDRSTRLEN+1], dbuf[INET6_ADDRSTRLEN];
|
|
|
|
Printf("\n%d bytes from %s to %s", cc,
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
sbuf, sizeof(sbuf)),
|
|
inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
|
|
dbuf, sizeof(dbuf)));
|
|
Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
|
|
icp->icmp6_code);
|
|
for (i = 4; i < cc ; i += sizeof(long))
|
|
Printf("%2d: %8.8x\n", i, (u_int32_t)ntohl(*lp++));
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Increment pointer until find the UDP header.
|
|
*/
|
|
struct udphdr *
|
|
get_udphdr(ip6, lim)
|
|
struct ip6_hdr *ip6;
|
|
u_char *lim;
|
|
{
|
|
u_char *cp = (u_char *)ip6, nh;
|
|
int hlen;
|
|
|
|
if (cp + sizeof(*ip6) >= lim)
|
|
return(NULL);
|
|
|
|
nh = ip6->ip6_nxt;
|
|
cp += sizeof(struct ip6_hdr);
|
|
|
|
while(lim - cp >= 8) {
|
|
switch(nh) {
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_TCP:
|
|
case IPPROTO_ICMPV6:
|
|
return(NULL);
|
|
case IPPROTO_UDP:
|
|
return((struct udphdr *)cp);
|
|
case IPPROTO_FRAGMENT:
|
|
hlen = sizeof(struct ip6_frag);
|
|
nh = ((struct ip6_frag *)cp)->ip6f_nxt;
|
|
break;
|
|
case IPPROTO_AH:
|
|
hlen = (((struct ip6_ext *)cp)->ip6e_len + 2) << 2;
|
|
nh = ((struct ip6_ext *)cp)->ip6e_nxt;
|
|
break;
|
|
default:
|
|
hlen = (((struct ip6_ext *)cp)->ip6e_len + 1) << 3;
|
|
nh = ((struct ip6_ext *)cp)->ip6e_nxt;
|
|
break;
|
|
}
|
|
|
|
cp += hlen;
|
|
}
|
|
|
|
return(NULL);
|
|
}
|
|
|
|
void
|
|
print(mhdr, cc)
|
|
struct msghdr *mhdr;
|
|
int cc;
|
|
{
|
|
struct sockaddr_in6 *from = (struct sockaddr_in6 *)mhdr->msg_name;
|
|
|
|
if (nflag) {
|
|
Printf(" %s", inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
}
|
|
else if (lflag) {
|
|
Printf(" %s (%s)", inetname(&from->sin6_addr),
|
|
inet_ntop(AF_INET6, &from->sin6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
}
|
|
else {
|
|
Printf(" %s", inetname(&from->sin6_addr));
|
|
}
|
|
|
|
if (verbose) {
|
|
Printf(" %d bytes of data to %s", cc,
|
|
inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
|
|
ntop_buf, sizeof(ntop_buf)));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Subtract 2 timeval structs: out = out - in.
|
|
* Out is assumed to be >= in.
|
|
*/
|
|
void
|
|
tvsub(out, in)
|
|
register struct timeval *out, *in;
|
|
{
|
|
if ((out->tv_usec -= in->tv_usec) < 0) {
|
|
out->tv_sec--;
|
|
out->tv_usec += 1000000;
|
|
}
|
|
out->tv_sec -= in->tv_sec;
|
|
}
|
|
|
|
|
|
/*
|
|
* Construct an Internet address representation.
|
|
* If the nflag has been supplied, give
|
|
* numeric value, otherwise try for symbolic name.
|
|
*/
|
|
char *
|
|
inetname(in)
|
|
struct in6_addr *in;
|
|
{
|
|
register char *cp;
|
|
static char line[50];
|
|
struct hostent *hp;
|
|
static char domain[MAXHOSTNAMELEN + 1];
|
|
static int first = 1;
|
|
int herr;
|
|
|
|
if (first && !nflag) {
|
|
first = 0;
|
|
if (gethostname(domain, MAXHOSTNAMELEN) == 0 &&
|
|
(cp = index(domain, '.')))
|
|
(void) strcpy(domain, cp + 1);
|
|
else
|
|
domain[0] = 0;
|
|
}
|
|
cp = 0;
|
|
if (!nflag) {
|
|
/* hp = (struct hostent *)addr2hostname(in, sizeof(*in), AF_INET6, &herr); */
|
|
hp = (struct hostent *)getipnodebyaddr((const char *)in, sizeof(*in),
|
|
AF_INET6, &herr);
|
|
if (hp) {
|
|
if ((cp = index(hp->h_name, '.')) &&
|
|
!strcmp(cp + 1, domain))
|
|
*cp = 0;
|
|
cp = hp->h_name;
|
|
#undef freehostent(hp)
|
|
freehostent(hp);
|
|
#define freehostent(hp)
|
|
}
|
|
}
|
|
if (cp)
|
|
(void) strcpy(line, cp);
|
|
else {
|
|
(void)inet_ntop(AF_INET6, in, line, sizeof(line));
|
|
}
|
|
return (line);
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: traceroute6 [-dlnrv] [-m max_hops] [-p port#] [-q nqueries]\n\t\
|
|
[-s src_addr] [-g gateway] [-w wait] host [data size]\n");
|
|
exit(1);
|
|
}
|