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951 lines
27 KiB
951 lines
27 KiB
/*
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* Modified for NRL 4.4BSD IPv6 release.
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* 07/31/96 bgp
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*
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* Search for "#ifdef NRL" to find the changes.
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*/
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/*
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* Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt>
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* 31/07/1996
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*
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* As ICMP error messages for IPv6 now include more than 8 bytes
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* UDP datagrams are now sent via an UDP socket instead of magic
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* RAW socket tricks.
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*
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* Original copyright and comments left intact. They might not
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* match the code anymore.
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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
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* 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
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* 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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#ifndef lint
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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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/*
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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
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* unreachable" (which means we got to "host") or hit a max (which
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* defaults to 30 hops & can be changed with the -m flag). Three
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* probes (change with -q flag) are sent at each ttl setting and a
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* 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
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* different gateways, the address of each responding system will
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* be printed. If there is no response within a 5 sec. timeout
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* interval (changed with the -w flag), a "*" is printed for that
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* probe.
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*
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* Probe packets are UDP format. We don't want the destination
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* host to process them so the destination port is set to an
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* 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
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* original datagram. Since, for gateways, the remaining ttl is
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* 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
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* 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
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* 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
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* 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
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* 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
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* 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
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* 7 * * *
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* 8 * * *
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* 9 * * *
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* 10 * * *
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* 11 * * *
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* 12 * * *
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* 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
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*
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* Notice that there are 12 "gateways" (13 is the final
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* 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
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* icmp's) until we probe with a ttl that's at least twice the path
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* 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.
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* Traceroute prints a "!" after the time if the ttl is <= 1.
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* 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
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* frequently and/or take care picking the target host of your
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* probes.
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*
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* Other possible annotations after the time are !H, !N, !P (got a host,
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* network or protocol unreachable, respectively), !S or !F (source
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* route failed or fragmentation needed -- neither of these should
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* 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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*
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* Notes
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* -----
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* 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
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* 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
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* system available from Berkeley: A raw ip socket using proto
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* IPPROTO_RAW must interpret the data sent as an ip datagram (as
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* opposed to data to be wrapped in a ip datagram). See the README
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* file that came with the source to this program for a description
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* of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
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* vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
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* MODIFIED TO RUN THIS PROGRAM.
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*
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* The udp port usage may appear bizarre (well, ok, it is bizarre).
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* The problem is that an icmp message only contains 8 bytes of
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* data from the original datagram. 8 bytes is the size of a udp
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* header so, if we want to associate replies with the original
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* datagram, the necessary information must be encoded into the
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* udp header (the ip id could be used but there's no way to
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* interlock with the kernel's assignment of ip id's and, anyway,
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* it would have taken a lot more kernel hacking to allow this
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* code to set the ip id). So, to allow two or more users to
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* use traceroute simultaneously, we use this task's pid as the
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* source port (the high bit is set to move the port number out
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* of the "likely" range). To keep track of which probe is being
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* replied to (so times and/or hop counts don't get confused by a
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* reply that was delayed in transit), we increment the destination
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* port number before each probe.
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*
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* Don't use this as a coding example. I was trying to find a
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* routing problem and this code sort-of popped out after 48 hours
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* without sleep. I was amazed it ever compiled, much less ran.
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*
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* I stole the idea for this program from Steve Deering. Since
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* the first release, I've learned that had I attended the right
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* IETF working group meetings, I also could have stolen it from Guy
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* Almes or Matt Mathis. I don't know (or care) who came up with
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* the idea first. I envy the originators' perspicacity and I'm
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* glad they didn't keep the idea a secret.
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*
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* Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
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* enhancements to the original distribution.
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*
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* I've hacked up a round-trip-route version of this that works by
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* sending a loose-source-routed udp datagram through the destination
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* back to yourself. Unfortunately, SO many gateways botch source
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* routing, the thing is almost worthless. Maybe one day...
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*
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* -- Van Jacobson (van@helios.ee.lbl.gov)
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* Tue Dec 20 03:50:13 PST 1988
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*/
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#include <sys/param.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <net/if.h>
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#if __linux__
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#include <endian.h>
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#endif
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/udp.h>
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#include <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <linux/types.h>
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#ifdef CAPABILITIES
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#include <sys/capability.h>
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#endif
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#ifdef USE_IDN
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#include <idna.h>
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#include <locale.h>
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#endif
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "SNAPSHOT.h"
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#ifndef SOL_IPV6
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#define SOL_IPV6 IPPROTO_IPV6
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#endif
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#define MAXPACKET 65535
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#define MAX_HOSTNAMELEN NI_MAXHOST
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#ifndef FD_SET
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#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)))
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#define FD_ZERO(p) memset((char *)(p), 0, sizeof(*(p)))
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#endif
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#define Fprintf (void)fprintf
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#define Printf (void)printf
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u_char packet[512]; /* last inbound (icmp) packet */
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int wait_for_reply(int, struct sockaddr_in6 *, struct in6_addr *, int);
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int packet_ok(u_char *buf, int cc, struct sockaddr_in6 *from,
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struct in6_addr *to, int seq, struct timeval *);
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void send_probe(int seq, int ttl);
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double deltaT (struct timeval *, struct timeval *);
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void print(unsigned char *buf, int cc, struct sockaddr_in6 *from);
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void tvsub (struct timeval *, struct timeval *);
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void usage(void);
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int icmp_sock; /* receive (icmp) socket file descriptor */
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int sndsock; /* send (udp) socket file descriptor */
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struct timezone tz; /* leftover */
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struct sockaddr_in6 whereto; /* Who to try to reach */
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struct sockaddr_in6 saddr;
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struct sockaddr_in6 firsthop;
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char *source = NULL;
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char *device = NULL;
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char *hostname;
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int nprobes = 3;
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int max_ttl = 30;
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pid_t ident;
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u_short port = 32768+666; /* start udp dest port # for probe packets */
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int options; /* socket options */
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int verbose;
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int waittime = 5; /* time to wait for response (in seconds) */
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int nflag; /* print addresses numerically */
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struct pkt_format
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{
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__u32 ident;
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__u32 seq;
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struct timeval tv;
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};
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char *sendbuff;
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int datalen = sizeof(struct pkt_format);
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int main(int argc, char *argv[])
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{
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char pa[MAX_HOSTNAMELEN];
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extern char *optarg;
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extern int optind;
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struct hostent *hp;
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struct sockaddr_in6 from, *to;
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int ch, i, on, probe, seq, tos, ttl;
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int socket_errno;
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icmp_sock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6);
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socket_errno = errno;
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if (setuid(getuid())) {
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perror("traceroute6: setuid");
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exit(-1);
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}
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#ifdef CAPABILITIES
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{
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cap_t caps = cap_init();
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if (cap_set_proc(caps)) {
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perror("traceroute6: cap_set_proc");
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exit(-1);
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}
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cap_free(caps);
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}
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#endif
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#ifdef USE_IDN
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setlocale(LC_ALL, "");
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#endif
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on = 1;
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seq = tos = 0;
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to = (struct sockaddr_in6 *)&whereto;
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while ((ch = getopt(argc, argv, "dm:np:q:rs:t:w:vi:g:V")) != EOF) {
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switch(ch) {
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case 'd':
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options |= SO_DEBUG;
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break;
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case 'm':
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max_ttl = atoi(optarg);
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if (max_ttl <= 1) {
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Fprintf(stderr,
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"traceroute: max ttl must be >1.\n");
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exit(1);
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}
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break;
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case 'n':
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nflag++;
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break;
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case 'p':
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port = atoi(optarg);
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if (port < 1) {
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Fprintf(stderr,
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"traceroute: port must be >0.\n");
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exit(1);
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}
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break;
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case 'q':
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nprobes = atoi(optarg);
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if (nprobes < 1) {
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Fprintf(stderr,
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"traceroute: nprobes must be >0.\n");
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exit(1);
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}
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break;
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case 'r':
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options |= SO_DONTROUTE;
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break;
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case 's':
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/*
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* set the ip source address of the outbound
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* probe (e.g., on a multi-homed host).
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*/
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source = optarg;
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break;
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case 'i':
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device = optarg;
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break;
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case 'g':
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Fprintf(stderr, "Sorry, rthdr is not yet supported\n");
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break;
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case 'v':
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verbose++;
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break;
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case 'w':
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waittime = atoi(optarg);
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if (waittime <= 1) {
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Fprintf(stderr,
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"traceroute: wait must be >1 sec.\n");
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exit(1);
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}
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break;
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case 'V':
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printf("traceroute6 utility, iputils-%s\n", SNAPSHOT);
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exit(0);
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 1)
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usage();
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setlinebuf (stdout);
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(void) memset((char *)&whereto, 0, sizeof(whereto));
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to->sin6_family = AF_INET6;
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to->sin6_port = htons(port);
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if (inet_pton(AF_INET6, *argv, &to->sin6_addr) > 0) {
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hostname = *argv;
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} else {
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|
char *idn = NULL;
|
|
#ifdef USE_IDN
|
|
if (idna_to_ascii_lz(*argv, &idn, 0) != IDNA_SUCCESS)
|
|
idn = NULL;
|
|
#endif
|
|
hp = gethostbyname2(idn ? idn : *argv, AF_INET6);
|
|
if (hp) {
|
|
memmove((caddr_t)&to->sin6_addr, hp->h_addr, sizeof(to->sin6_addr));
|
|
hostname = (char *)hp->h_name;
|
|
} else {
|
|
(void)fprintf(stderr,
|
|
"traceroute: unknown host %s\n", *argv);
|
|
exit(1);
|
|
}
|
|
}
|
|
firsthop = *to;
|
|
if (*++argv) {
|
|
datalen = atoi(*argv);
|
|
/* Message for rpm maintainers: have _shame_. If you want
|
|
* to fix something send the patch to me for sanity checking.
|
|
* "datalen" patch is a shit. */
|
|
if (datalen == 0)
|
|
datalen = sizeof(struct pkt_format);
|
|
else if (datalen < (int)sizeof(struct pkt_format) ||
|
|
datalen >= MAXPACKET) {
|
|
Fprintf(stderr,
|
|
"traceroute: packet size must be %d <= s < %d.\n",
|
|
(int)sizeof(struct pkt_format), MAXPACKET);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
ident = getpid();
|
|
|
|
sendbuff = malloc(datalen);
|
|
if (sendbuff == NULL) {
|
|
fprintf(stderr, "malloc failed\n");
|
|
exit(1);
|
|
}
|
|
|
|
if (icmp_sock < 0) {
|
|
errno = socket_errno;
|
|
perror("traceroute6: icmp socket");
|
|
exit(1);
|
|
}
|
|
|
|
#ifdef IPV6_RECVPKTINFO
|
|
setsockopt(icmp_sock, SOL_IPV6, IPV6_RECVPKTINFO, &on, sizeof(on));
|
|
setsockopt(icmp_sock, SOL_IPV6, IPV6_2292PKTINFO, &on, sizeof(on));
|
|
#else
|
|
setsockopt(icmp_sock, SOL_IPV6, IPV6_PKTINFO, &on, sizeof(on));
|
|
#endif
|
|
|
|
if (options & SO_DEBUG)
|
|
setsockopt(icmp_sock, SOL_SOCKET, SO_DEBUG,
|
|
(char *)&on, sizeof(on));
|
|
if (options & SO_DONTROUTE)
|
|
setsockopt(icmp_sock, SOL_SOCKET, SO_DONTROUTE,
|
|
(char *)&on, sizeof(on));
|
|
|
|
#ifdef __linux__
|
|
on = 2;
|
|
if (setsockopt(icmp_sock, SOL_RAW, IPV6_CHECKSUM, &on, sizeof(on)) < 0) {
|
|
/* checksum should be enabled by default and setting this
|
|
* option might fail anyway.
|
|
*/
|
|
fprintf(stderr, "setsockopt(RAW_CHECKSUM) failed - try to continue.");
|
|
}
|
|
#endif
|
|
|
|
if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
|
|
perror("traceroute: UDP socket");
|
|
exit(5);
|
|
}
|
|
#ifdef SO_SNDBUF
|
|
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&datalen,
|
|
sizeof(datalen)) < 0) {
|
|
perror("traceroute: SO_SNDBUF");
|
|
exit(6);
|
|
}
|
|
#endif /* SO_SNDBUF */
|
|
|
|
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 (source == NULL) {
|
|
socklen_t alen;
|
|
int probe_fd = socket(AF_INET6, SOCK_DGRAM, 0);
|
|
|
|
if (probe_fd < 0) {
|
|
perror("socket");
|
|
exit(1);
|
|
}
|
|
if (device) {
|
|
if (setsockopt(probe_fd, SOL_SOCKET, SO_BINDTODEVICE, device, strlen(device)+1) == -1)
|
|
perror("WARNING: interface is ignored");
|
|
}
|
|
firsthop.sin6_port = htons(1025);
|
|
if (connect(probe_fd, (struct sockaddr*)&firsthop, sizeof(firsthop)) == -1) {
|
|
perror("connect");
|
|
exit(1);
|
|
}
|
|
alen = sizeof(saddr);
|
|
if (getsockname(probe_fd, (struct sockaddr*)&saddr, &alen) == -1) {
|
|
perror("getsockname");
|
|
exit(1);
|
|
}
|
|
saddr.sin6_port = 0;
|
|
close(probe_fd);
|
|
} else {
|
|
(void) memset((char *)&saddr, 0, sizeof(saddr));
|
|
saddr.sin6_family = AF_INET6;
|
|
if (inet_pton(AF_INET6, source, &saddr.sin6_addr) <= 0)
|
|
{
|
|
Printf("traceroute: unknown addr %s\n", source);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
if (bind(sndsock, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) {
|
|
perror ("traceroute: bind sending socket");
|
|
exit (1);
|
|
}
|
|
if (bind(icmp_sock, (struct sockaddr *)&saddr, sizeof(saddr)) < 0) {
|
|
perror ("traceroute: bind icmp6 socket");
|
|
exit (1);
|
|
}
|
|
|
|
Fprintf(stderr, "traceroute to %s (%s)", hostname,
|
|
inet_ntop(AF_INET6, &to->sin6_addr, pa, sizeof(pa)));
|
|
|
|
Fprintf(stderr, " from %s",
|
|
inet_ntop(AF_INET6, &saddr.sin6_addr, pa, sizeof(pa)));
|
|
Fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, datalen);
|
|
(void) fflush(stderr);
|
|
|
|
for (ttl = 1; ttl <= max_ttl; ++ttl) {
|
|
struct in6_addr lastaddr = {{{0,}}};
|
|
int got_there = 0;
|
|
int unreachable = 0;
|
|
|
|
Printf("%2d ", ttl);
|
|
for (probe = 0; probe < nprobes; ++probe) {
|
|
int cc, reset_timer;
|
|
struct timeval t1, t2;
|
|
struct timezone tz;
|
|
struct in6_addr to;
|
|
|
|
gettimeofday(&t1, &tz);
|
|
send_probe(++seq, ttl);
|
|
reset_timer = 1;
|
|
|
|
while ((cc = wait_for_reply(icmp_sock, &from, &to, reset_timer)) != 0) {
|
|
gettimeofday(&t2, &tz);
|
|
if ((i = packet_ok(packet, cc, &from, &to, seq, &t1))) {
|
|
reset_timer = 1;
|
|
if (memcmp(&from.sin6_addr, &lastaddr, sizeof(from.sin6_addr))) {
|
|
print(packet, cc, &from);
|
|
memcpy(&lastaddr,
|
|
&from.sin6_addr,
|
|
sizeof(lastaddr));
|
|
}
|
|
Printf(" %g ms", deltaT(&t1, &t2));
|
|
switch(i - 1) {
|
|
case ICMP6_DST_UNREACH_NOPORT:
|
|
++got_there;
|
|
break;
|
|
|
|
case ICMP6_DST_UNREACH_NOROUTE:
|
|
++unreachable;
|
|
Printf(" !N");
|
|
break;
|
|
case ICMP6_DST_UNREACH_ADDR:
|
|
++unreachable;
|
|
Printf(" !H");
|
|
break;
|
|
|
|
case ICMP6_DST_UNREACH_ADMIN:
|
|
++unreachable;
|
|
Printf(" !S");
|
|
break;
|
|
}
|
|
break;
|
|
} else
|
|
reset_timer = 0;
|
|
}
|
|
if (cc <= 0)
|
|
Printf(" *");
|
|
(void) fflush(stdout);
|
|
}
|
|
putchar('\n');
|
|
if (got_there ||
|
|
(unreachable > 0 && unreachable >= nprobes-1))
|
|
exit(0);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
wait_for_reply(sock, from, to, reset_timer)
|
|
int sock;
|
|
struct sockaddr_in6 *from;
|
|
struct in6_addr *to;
|
|
int reset_timer;
|
|
{
|
|
fd_set fds;
|
|
static struct timeval wait;
|
|
int cc = 0;
|
|
char cbuf[512];
|
|
|
|
FD_ZERO(&fds);
|
|
FD_SET(sock, &fds);
|
|
if (reset_timer) {
|
|
/*
|
|
* traceroute could hang if someone else has a ping
|
|
* running and our ICMP reply gets dropped but we don't
|
|
* realize it because we keep waking up to handle those
|
|
* other ICMP packets that keep coming in. To fix this,
|
|
* "reset_timer" will only be true if the last packet that
|
|
* came in was for us or if this is the first time we're
|
|
* waiting for a reply since sending out a probe. Note
|
|
* that this takes advantage of the select() feature on
|
|
* Linux where the remaining timeout is written to the
|
|
* struct timeval area.
|
|
*/
|
|
wait.tv_sec = waittime;
|
|
wait.tv_usec = 0;
|
|
}
|
|
|
|
if (select(sock+1, &fds, (fd_set *)0, (fd_set *)0, &wait) > 0) {
|
|
struct iovec iov;
|
|
struct msghdr msg;
|
|
iov.iov_base = packet;
|
|
iov.iov_len = sizeof(packet);
|
|
msg.msg_name = (void *)from;
|
|
msg.msg_namelen = sizeof(*from);
|
|
msg.msg_iov = &iov;
|
|
msg.msg_iovlen = 1;
|
|
msg.msg_flags = 0;
|
|
msg.msg_control = cbuf;
|
|
msg.msg_controllen = sizeof(cbuf);
|
|
|
|
cc = recvmsg(icmp_sock, &msg, 0);
|
|
if (cc >= 0) {
|
|
struct cmsghdr *cmsg;
|
|
struct in6_pktinfo *ipi;
|
|
|
|
for (cmsg = CMSG_FIRSTHDR(&msg);
|
|
cmsg;
|
|
cmsg = CMSG_NXTHDR(&msg, cmsg)) {
|
|
if (cmsg->cmsg_level != SOL_IPV6)
|
|
continue;
|
|
switch (cmsg->cmsg_type) {
|
|
case IPV6_PKTINFO:
|
|
#ifdef IPV6_2292PKTINFO
|
|
case IPV6_2292PKTINFO:
|
|
#endif
|
|
ipi = (struct in6_pktinfo *)CMSG_DATA(cmsg);
|
|
memcpy(to, ipi, sizeof(*to));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return(cc);
|
|
}
|
|
|
|
|
|
void send_probe(int seq, int ttl)
|
|
{
|
|
struct pkt_format *pkt = (struct pkt_format *) sendbuff;
|
|
int i;
|
|
|
|
pkt->ident = htonl(ident);
|
|
pkt->seq = htonl(seq);
|
|
gettimeofday(&pkt->tv, &tz);
|
|
|
|
i = setsockopt(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
|
|
if (i < 0)
|
|
{
|
|
perror("setsockopt");
|
|
exit(1);
|
|
}
|
|
|
|
do {
|
|
i = sendto(sndsock, sendbuff, datalen, 0,
|
|
(struct sockaddr *)&whereto, sizeof(whereto));
|
|
} while (i<0 && errno == ECONNREFUSED);
|
|
|
|
if (i < 0 || i != datalen) {
|
|
if (i<0)
|
|
perror("sendto");
|
|
Printf("traceroute: wrote %s %d chars, ret=%d\n", hostname,
|
|
datalen, i);
|
|
(void) fflush(stdout);
|
|
}
|
|
}
|
|
|
|
|
|
double deltaT(struct timeval *t1p, struct timeval *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(unsigned char t)
|
|
{
|
|
switch(t) {
|
|
/* Unknown */
|
|
case 0:
|
|
return "Error";
|
|
case 1:
|
|
/* ICMP6_DST_UNREACH: */
|
|
return "Destination Unreachable";
|
|
case 2:
|
|
/* ICMP6_PACKET_TOO_BIG: */
|
|
return "Packet Too Big";
|
|
case 3:
|
|
/* ICMP6_TIME_EXCEEDED */
|
|
return "Time Exceeded in Transit";
|
|
case 4:
|
|
/* ICMP6_PARAM_PROB */
|
|
return "Parameter Problem";
|
|
case 128:
|
|
/* ICMP6_ECHO_REQUEST */
|
|
return "Echo Request";
|
|
case 129:
|
|
/* ICMP6_ECHO_REPLY */
|
|
return "Echo Reply";
|
|
case 130:
|
|
/* ICMP6_MEMBERSHIP_QUERY */
|
|
return "Membership Query";
|
|
case 131:
|
|
/* ICMP6_MEMBERSHIP_REPORT */
|
|
return "Membership Report";
|
|
case 132:
|
|
/* ICMP6_MEMBERSHIP_REDUCTION */
|
|
return "Membership Reduction";
|
|
case 133:
|
|
/* ND_ROUTER_SOLICIT */
|
|
return "Router Solicitation";
|
|
case 134:
|
|
/* ND_ROUTER_ADVERT */
|
|
return "Router Advertisement";
|
|
case 135:
|
|
/* ND_NEIGHBOR_SOLICIT */
|
|
return "Neighbor Solicitation";
|
|
case 136:
|
|
/* ND_NEIGHBOR_ADVERT */
|
|
return "Neighbor Advertisement";
|
|
case 137:
|
|
/* ND_REDIRECT */
|
|
return "Redirect";
|
|
}
|
|
|
|
return("OUT-OF-RANGE");
|
|
}
|
|
|
|
|
|
int packet_ok(u_char *buf, int cc, struct sockaddr_in6 *from,
|
|
struct in6_addr *to, int seq,
|
|
struct timeval *tv)
|
|
{
|
|
struct icmp6_hdr *icp;
|
|
u_char type, code;
|
|
|
|
icp = (struct icmp6_hdr *) buf;
|
|
|
|
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;
|
|
int nexthdr;
|
|
|
|
hip = (struct ip6_hdr *) (icp + 1);
|
|
up = (struct udphdr *)(hip+1);
|
|
nexthdr = hip->ip6_nxt;
|
|
|
|
if (nexthdr == 44) {
|
|
nexthdr = *(unsigned char*)up;
|
|
up++;
|
|
}
|
|
if (nexthdr == IPPROTO_UDP)
|
|
{
|
|
struct pkt_format *pkt;
|
|
|
|
pkt = (struct pkt_format *) (up + 1);
|
|
|
|
if (ntohl(pkt->ident) == ident &&
|
|
ntohl(pkt->seq) == seq)
|
|
{
|
|
*tv = pkt->tv;
|
|
return (type == ICMP6_TIME_EXCEEDED ? -1 : code+1);
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
if (verbose) {
|
|
unsigned char *p;
|
|
char pa1[MAX_HOSTNAMELEN];
|
|
char pa2[MAX_HOSTNAMELEN];
|
|
int i;
|
|
|
|
p = (unsigned char *) (icp + 1);
|
|
|
|
Printf("\n%d bytes from %s to %s", cc,
|
|
inet_ntop(AF_INET6, &from->sin6_addr, pa1, sizeof(pa1)),
|
|
inet_ntop(AF_INET6, to, pa2, sizeof(pa2)));
|
|
|
|
Printf(": icmp type %d (%s) code %d\n", type, pr_type(type),
|
|
icp->icmp6_code);
|
|
|
|
cc -= sizeof(struct icmp6_hdr);
|
|
for (i = 0; i < cc ; i++) {
|
|
if (i % 16 == 0)
|
|
Printf("%04x:", i);
|
|
if (i % 4 == 0)
|
|
Printf(" ");
|
|
Printf("%02x", 0xff & (unsigned)p[i]);
|
|
if (i % 16 == 15 && i + 1 < cc)
|
|
Printf("\n");
|
|
}
|
|
Printf("\n");
|
|
}
|
|
|
|
return(0);
|
|
}
|
|
|
|
|
|
void print(unsigned char *buf, int cc, struct sockaddr_in6 *from)
|
|
{
|
|
char pa[MAX_HOSTNAMELEN];
|
|
|
|
if (nflag)
|
|
Printf(" %s", inet_ntop(AF_INET6, &from->sin6_addr,
|
|
pa, sizeof(pa)));
|
|
else
|
|
{
|
|
const char *hostname;
|
|
struct hostent *hp;
|
|
char *s = NULL;
|
|
|
|
hostname = inet_ntop(AF_INET6, &from->sin6_addr, pa, sizeof(pa));
|
|
|
|
if ((hp = gethostbyaddr((char *)&from->sin6_addr,
|
|
sizeof(from->sin6_addr), AF_INET6))) {
|
|
#ifdef USE_IDN
|
|
if (idna_to_unicode_lzlz(hp->h_name, &s, 0) != IDNA_SUCCESS)
|
|
s = NULL;
|
|
#endif
|
|
}
|
|
|
|
Printf(" %s (%s)", hp ? (s ? s : hp->h_name) : hostname, pa);
|
|
|
|
free(s);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
void usage(void)
|
|
{
|
|
fprintf(stderr,
|
|
"Usage: traceroute6 [-dnrvV] [-m max_ttl] [-p port#] [-q nqueries]\n\t\
|
|
[-s src_addr] [-t tos] [-w wait] host [data size]\n");
|
|
exit(1);
|
|
}
|