1433 lines
39 KiB
C
1433 lines
39 KiB
C
/* $KAME: traceroute6.c,v 1.68 2004/01/25 11:16:12 suz Exp $ */
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/*
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* 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
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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. Neither the name of the project 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 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
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT 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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/*-
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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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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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#if 0
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static char sccsid[] = "@(#)traceroute.c 8.1 (Berkeley) 6/6/93";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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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 an 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/uio.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#include <sys/sysctl.h>
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#include <netinet/in.h>
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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 <err.h>
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#ifdef HAVE_POLL
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#include <poll.h>
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#endif
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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 <netinet/ip6.h>
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#include <netinet/icmp6.h>
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#include <netinet/udp.h>
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#ifdef IPSEC
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#include <net/route.h>
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#include <netipsec/ipsec.h>
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#endif
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#define DUMMY_PORT 10010
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#define MAXPACKET 65535 /* max ip packet size */
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#ifndef HAVE_GETIPNODEBYNAME
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#define getipnodebyname(x, y, z, u) gethostbyname2((x), (y))
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#define freehostent(x)
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#endif
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/*
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* format of a (udp) probe packet.
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*/
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struct tv32 {
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u_int32_t tv32_sec;
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u_int32_t tv32_usec;
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};
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struct opacket {
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u_char seq; /* sequence number of this packet */
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u_char hops; /* hop limit of the packet */
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u_char pad[2];
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struct tv32 tv; /* time packet left */
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} __attribute__((__packed__));
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u_char packet[512]; /* last inbound (icmp) packet */
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struct opacket *outpacket; /* last output (udp) packet */
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int main(int, char *[]);
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int wait_for_reply(int, struct msghdr *);
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#ifdef IPSEC
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#ifdef IPSEC_POLICY_IPSEC
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int setpolicy(int so, char *policy);
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#endif
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#endif
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void send_probe(int, u_long);
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void *get_uphdr(struct ip6_hdr *, u_char *);
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int get_hoplim(struct msghdr *);
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double deltaT(struct timeval *, struct timeval *);
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char *pr_type(int);
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int packet_ok(struct msghdr *, int, int);
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void print(struct msghdr *, int);
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const char *inetname(struct sockaddr *);
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void usage(void);
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int rcvsock; /* receive (icmp) socket file descriptor */
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int sndsock; /* send (udp) socket file descriptor */
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struct msghdr rcvmhdr;
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struct iovec rcviov[2];
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int rcvhlim;
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struct in6_pktinfo *rcvpktinfo;
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struct sockaddr_in6 Src, Dst, Rcv;
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u_long datalen; /* How much data */
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#define ICMP6ECHOLEN 8
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/* XXX: 2064 = 127(max hops in type 0 rthdr) * sizeof(ip6_hdr) + 16(margin) */
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char rtbuf[2064];
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#ifdef USE_RFC2292BIS
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struct ip6_rthdr *rth;
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#endif
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struct cmsghdr *cmsg;
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char *source = 0;
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char *hostname;
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u_long nprobes = 3;
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u_long first_hop = 1;
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u_long max_hops = 30;
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u_int16_t srcport;
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u_int16_t port = 32768+666; /* start udp dest port # for probe packets */
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u_int16_t ident;
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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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int useproto = IPPROTO_UDP; /* protocol to use to send packet */
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int lflag; /* print both numerical address & hostname */
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int
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int mib[4] = { CTL_NET, PF_INET6, IPPROTO_IPV6, IPV6CTL_DEFHLIM };
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char hbuf[NI_MAXHOST], src0[NI_MAXHOST], *ep;
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int ch, i, on = 1, seq, rcvcmsglen, error, minlen;
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struct addrinfo hints, *res;
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static u_char *rcvcmsgbuf;
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u_long probe, hops, lport;
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struct hostent *hp;
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size_t size;
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uid_t uid;
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/*
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* Receive ICMP
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*/
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if ((rcvsock = socket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6)) < 0) {
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perror("socket(ICMPv6)");
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exit(5);
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}
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size = sizeof(i);
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(void) sysctl(mib, sizeof(mib)/sizeof(mib[0]), &i, &size, NULL, 0);
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max_hops = i;
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/* specify to tell receiving interface */
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#ifdef IPV6_RECVPKTINFO
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if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVPKTINFO, &on,
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sizeof(on)) < 0)
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err(1, "setsockopt(IPV6_RECVPKTINFO)");
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#else /* old adv. API */
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if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_PKTINFO, &on,
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sizeof(on)) < 0)
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err(1, "setsockopt(IPV6_PKTINFO)");
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#endif
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/* specify to tell value of hoplimit field of received IP6 hdr */
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#ifdef IPV6_RECVHOPLIMIT
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if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_RECVHOPLIMIT, &on,
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sizeof(on)) < 0)
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err(1, "setsockopt(IPV6_RECVHOPLIMIT)");
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#else /* old adv. API */
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if (setsockopt(rcvsock, IPPROTO_IPV6, IPV6_HOPLIMIT, &on,
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sizeof(on)) < 0)
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err(1, "setsockopt(IPV6_HOPLIMIT)");
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#endif
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seq = 0;
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while ((ch = getopt(argc, argv, "df:g:Ilm:nNp:q:rs:Uvw:")) != -1)
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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 'f':
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ep = NULL;
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errno = 0;
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first_hop = strtoul(optarg, &ep, 0);
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if (errno || !*optarg || *ep || first_hop > 255) {
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fprintf(stderr,
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"traceroute6: invalid min hoplimit.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'g':
|
|
hp = getipnodebyname(optarg, AF_INET6, 0, &h_errno);
|
|
if (hp == NULL) {
|
|
fprintf(stderr,
|
|
"traceroute6: unknown host %s\n", optarg);
|
|
exit(1);
|
|
}
|
|
#ifdef USE_RFC2292BIS
|
|
if (rth == NULL) {
|
|
/*
|
|
* XXX: We can't detect the number of
|
|
* intermediate nodes yet.
|
|
*/
|
|
if ((rth = inet6_rth_init((void *)rtbuf,
|
|
sizeof(rtbuf), IPV6_RTHDR_TYPE_0,
|
|
0)) == NULL) {
|
|
fprintf(stderr,
|
|
"inet6_rth_init failed.\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
if (inet6_rth_add((void *)rth,
|
|
(struct in6_addr *)hp->h_addr)) {
|
|
fprintf(stderr,
|
|
"inet6_rth_add failed for %s\n",
|
|
optarg);
|
|
exit(1);
|
|
}
|
|
#else /* old advanced API */
|
|
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);
|
|
#endif
|
|
freehostent(hp);
|
|
break;
|
|
case 'I':
|
|
useproto = IPPROTO_ICMPV6;
|
|
ident = htons(getpid() & 0xffff); /* same as ping6 */
|
|
break;
|
|
case 'l':
|
|
lflag++;
|
|
break;
|
|
case 'm':
|
|
ep = NULL;
|
|
errno = 0;
|
|
max_hops = strtoul(optarg, &ep, 0);
|
|
if (errno || !*optarg || *ep || max_hops > 255) {
|
|
fprintf(stderr,
|
|
"traceroute6: invalid max hoplimit.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
case 'n':
|
|
nflag++;
|
|
break;
|
|
case 'N':
|
|
useproto = IPPROTO_NONE;
|
|
break;
|
|
case 'p':
|
|
ep = NULL;
|
|
errno = 0;
|
|
lport = strtoul(optarg, &ep, 0);
|
|
if (errno || !*optarg || *ep) {
|
|
fprintf(stderr, "traceroute6: invalid port.\n");
|
|
exit(1);
|
|
}
|
|
if (lport == 0 || lport != (lport & 0xffff)) {
|
|
fprintf(stderr,
|
|
"traceroute6: port out of range.\n");
|
|
exit(1);
|
|
}
|
|
port = lport & 0xffff;
|
|
break;
|
|
case 'q':
|
|
ep = NULL;
|
|
errno = 0;
|
|
nprobes = strtoul(optarg, &ep, 0);
|
|
if (errno || !*optarg || *ep) {
|
|
fprintf(stderr,
|
|
"traceroute6: invalid nprobes.\n");
|
|
exit(1);
|
|
}
|
|
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 'U':
|
|
useproto = IPPROTO_UDP;
|
|
break;
|
|
case 'w':
|
|
ep = NULL;
|
|
errno = 0;
|
|
waittime = strtoul(optarg, &ep, 0);
|
|
if (errno || !*optarg || *ep) {
|
|
fprintf(stderr,
|
|
"traceroute6: invalid wait time.\n");
|
|
exit(1);
|
|
}
|
|
if (waittime < 1) {
|
|
fprintf(stderr,
|
|
"traceroute6: wait must be >= 1 sec.\n");
|
|
exit(1);
|
|
}
|
|
break;
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
/*
|
|
* Open socket to send probe packets.
|
|
*/
|
|
switch (useproto) {
|
|
case IPPROTO_ICMPV6:
|
|
sndsock = rcvsock;
|
|
break;
|
|
case IPPROTO_UDP:
|
|
if ((sndsock = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) {
|
|
perror("socket(SOCK_DGRAM)");
|
|
exit(5);
|
|
}
|
|
break;
|
|
case IPPROTO_NONE:
|
|
if ((sndsock = socket(AF_INET6, SOCK_RAW, IPPROTO_NONE)) < 0) {
|
|
perror("socket(SOCK_RAW)");
|
|
exit(5);
|
|
}
|
|
break;
|
|
default:
|
|
fprintf(stderr, "traceroute6: unknown probe protocol %d",
|
|
useproto);
|
|
exit(5);
|
|
}
|
|
if (max_hops < first_hop) {
|
|
fprintf(stderr,
|
|
"traceroute6: max hoplimit must be larger than first hoplimit.\n");
|
|
exit(1);
|
|
}
|
|
|
|
/* revoke privs */
|
|
uid = getuid();
|
|
if (setresuid(uid, uid, uid) == -1) {
|
|
perror("setresuid");
|
|
exit(1);
|
|
}
|
|
|
|
|
|
if (argc < 1 || argc > 2)
|
|
usage();
|
|
|
|
#if 1
|
|
setvbuf(stdout, NULL, _IOLBF, BUFSIZ);
|
|
#else
|
|
setlinebuf(stdout);
|
|
#endif
|
|
|
|
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) {
|
|
fprintf(stderr,
|
|
"traceroute6: %s\n", gai_strerror(error));
|
|
exit(1);
|
|
}
|
|
if (res->ai_addrlen != sizeof(Dst)) {
|
|
fprintf(stderr,
|
|
"traceroute6: size of sockaddr mismatch\n");
|
|
exit(1);
|
|
}
|
|
memcpy(&Dst, res->ai_addr, res->ai_addrlen);
|
|
hostname = res->ai_canonname ? strdup(res->ai_canonname) : *argv;
|
|
if (!hostname) {
|
|
fprintf(stderr, "traceroute6: not enough core\n");
|
|
exit(1);
|
|
}
|
|
if (res->ai_next) {
|
|
if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf,
|
|
sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
strlcpy(hbuf, "?", sizeof(hbuf));
|
|
fprintf(stderr, "traceroute6: Warning: %s has multiple "
|
|
"addresses; using %s\n", hostname, hbuf);
|
|
}
|
|
|
|
if (*++argv) {
|
|
ep = NULL;
|
|
errno = 0;
|
|
datalen = strtoul(*argv, &ep, 0);
|
|
if (errno || !*argv || *ep) {
|
|
fprintf(stderr,
|
|
"traceroute6: invalid packet length.\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
switch (useproto) {
|
|
case IPPROTO_ICMPV6:
|
|
minlen = ICMP6ECHOLEN + sizeof(struct tv32);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
minlen = sizeof(struct opacket);
|
|
break;
|
|
case IPPROTO_NONE:
|
|
minlen = 0;
|
|
datalen = 0;
|
|
break;
|
|
default:
|
|
fprintf(stderr, "traceroute6: unknown probe protocol %d.\n",
|
|
useproto);
|
|
exit(1);
|
|
}
|
|
if (datalen < minlen)
|
|
datalen = minlen;
|
|
else if (datalen >= MAXPACKET) {
|
|
fprintf(stderr,
|
|
"traceroute6: packet size must be %d <= s < %ld.\n",
|
|
minlen, (long)MAXPACKET);
|
|
exit(1);
|
|
}
|
|
outpacket = (struct opacket *)malloc((unsigned)datalen);
|
|
if (!outpacket) {
|
|
perror("malloc");
|
|
exit(1);
|
|
}
|
|
(void) bzero((char *)outpacket, datalen);
|
|
|
|
/* 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;
|
|
rcvcmsglen = CMSG_SPACE(sizeof(struct in6_pktinfo)) +
|
|
CMSG_SPACE(sizeof(int));
|
|
if ((rcvcmsgbuf = malloc(rcvcmsglen)) == NULL) {
|
|
fprintf(stderr, "traceroute6: malloc failed\n");
|
|
exit(1);
|
|
}
|
|
rcvmhdr.msg_control = (caddr_t) rcvcmsgbuf;
|
|
rcvmhdr.msg_controllen = rcvcmsglen;
|
|
|
|
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, "%s", ipsec_strerror());
|
|
if (setpolicy(rcvsock, "out bypass") < 0)
|
|
errx(1, "%s", ipsec_strerror());
|
|
#else
|
|
{
|
|
int level = IPSEC_LEVEL_NONE;
|
|
|
|
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
|
|
sizeof(level));
|
|
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
|
|
sizeof(level));
|
|
#ifdef IP_AUTH_TRANS_LEVEL
|
|
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
|
|
sizeof(level));
|
|
#else
|
|
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
|
|
sizeof(level));
|
|
#endif
|
|
#ifdef IP_AUTH_NETWORK_LEVEL
|
|
(void)setsockopt(rcvsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
|
|
sizeof(level));
|
|
#endif
|
|
}
|
|
#endif /*IPSEC_POLICY_IPSEC*/
|
|
#endif /*IPSEC*/
|
|
|
|
#ifdef SO_SNDBUF
|
|
i = datalen;
|
|
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&i,
|
|
sizeof(i)) < 0 && useproto != IPPROTO_NONE) {
|
|
perror("setsockopt(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));
|
|
#ifdef USE_RFC2292BIS
|
|
if (rth) {/* XXX: there is no library to finalize the header... */
|
|
rth->ip6r_len = rth->ip6r_segleft * 2;
|
|
if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_RTHDR,
|
|
(void *)rth, (rth->ip6r_len + 1) << 3)) {
|
|
fprintf(stderr, "setsockopt(IPV6_RTHDR): %s\n",
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
#else /* old advanced API */
|
|
if (cmsg != NULL) {
|
|
inet6_rthdr_lasthop(cmsg, IPV6_RTHDR_LOOSE);
|
|
if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_PKTOPTIONS,
|
|
rtbuf, cmsg->cmsg_len) < 0) {
|
|
fprintf(stderr, "setsockopt(IPV6_PKTOPTIONS): %s\n",
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
#endif /* USE_RFC2292BIS */
|
|
#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, "%s", ipsec_strerror());
|
|
if (setpolicy(sndsock, "out bypass") < 0)
|
|
errx(1, "%s", ipsec_strerror());
|
|
#else
|
|
{
|
|
int level = IPSEC_LEVEL_BYPASS;
|
|
|
|
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_TRANS_LEVEL, &level,
|
|
sizeof(level));
|
|
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_ESP_NETWORK_LEVEL, &level,
|
|
sizeof(level));
|
|
#ifdef IP_AUTH_TRANS_LEVEL
|
|
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_TRANS_LEVEL, &level,
|
|
sizeof(level));
|
|
#else
|
|
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_LEVEL, &level,
|
|
sizeof(level));
|
|
#endif
|
|
#ifdef IP_AUTH_NETWORK_LEVEL
|
|
(void)setsockopt(sndsock, IPPROTO_IPV6, IPV6_AUTH_NETWORK_LEVEL, &level,
|
|
sizeof(level));
|
|
#endif
|
|
}
|
|
#endif /*IPSEC_POLICY_IPSEC*/
|
|
#endif /*IPSEC*/
|
|
|
|
/*
|
|
* Source selection
|
|
*/
|
|
bzero(&Src, sizeof(Src));
|
|
if (source) {
|
|
struct addrinfo hints, *res;
|
|
int error;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = AF_INET6;
|
|
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
|
|
hints.ai_flags = AI_NUMERICHOST;
|
|
error = getaddrinfo(source, "0", &hints, &res);
|
|
if (error) {
|
|
printf("traceroute6: %s: %s\n", source,
|
|
gai_strerror(error));
|
|
exit(1);
|
|
}
|
|
if (res->ai_addrlen > sizeof(Src)) {
|
|
printf("traceroute6: %s: %s\n", source,
|
|
gai_strerror(error));
|
|
exit(1);
|
|
}
|
|
memcpy(&Src, res->ai_addr, res->ai_addrlen);
|
|
freeaddrinfo(res);
|
|
} else {
|
|
struct sockaddr_in6 Nxt;
|
|
int dummy;
|
|
socklen_t len;
|
|
|
|
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");
|
|
exit(1);
|
|
}
|
|
if (connect(dummy, (struct sockaddr *)&Nxt, Nxt.sin6_len) < 0) {
|
|
perror("connect");
|
|
exit(1);
|
|
}
|
|
len = sizeof(Src);
|
|
if (getsockname(dummy, (struct sockaddr *)&Src, &len) < 0) {
|
|
perror("getsockname");
|
|
exit(1);
|
|
}
|
|
if (getnameinfo((struct sockaddr *)&Src, Src.sin6_len,
|
|
src0, sizeof(src0), NULL, 0, NI_NUMERICHOST)) {
|
|
fprintf(stderr, "getnameinfo failed for source\n");
|
|
exit(1);
|
|
}
|
|
source = src0;
|
|
close(dummy);
|
|
}
|
|
|
|
Src.sin6_port = htons(0);
|
|
if (bind(sndsock, (struct sockaddr *)&Src, Src.sin6_len) < 0) {
|
|
perror("bind");
|
|
exit(1);
|
|
}
|
|
|
|
{
|
|
socklen_t len;
|
|
|
|
len = sizeof(Src);
|
|
if (getsockname(sndsock, (struct sockaddr *)&Src, &len) < 0) {
|
|
perror("getsockname");
|
|
exit(1);
|
|
}
|
|
srcport = ntohs(Src.sin6_port);
|
|
}
|
|
|
|
/*
|
|
* Message to users
|
|
*/
|
|
if (getnameinfo((struct sockaddr *)&Dst, Dst.sin6_len, hbuf,
|
|
sizeof(hbuf), NULL, 0, NI_NUMERICHOST))
|
|
strlcpy(hbuf, "(invalid)", sizeof(hbuf));
|
|
fprintf(stderr, "traceroute6");
|
|
fprintf(stderr, " to %s (%s)", hostname, hbuf);
|
|
if (source)
|
|
fprintf(stderr, " from %s", source);
|
|
fprintf(stderr, ", %lu hops max, %lu byte packets\n",
|
|
max_hops, datalen);
|
|
(void) fflush(stderr);
|
|
|
|
if (first_hop > 1)
|
|
printf("Skipping %lu intermediate hops\n", first_hop - 1);
|
|
|
|
/*
|
|
* Main loop
|
|
*/
|
|
for (hops = first_hop; hops <= max_hops; ++hops) {
|
|
struct in6_addr lastaddr;
|
|
int got_there = 0;
|
|
int unreachable = 0;
|
|
|
|
printf("%2lu ", hops);
|
|
bzero(&lastaddr, sizeof(lastaddr));
|
|
for (probe = 0; probe < nprobes; ++probe) {
|
|
int cc;
|
|
struct timeval t1, t2;
|
|
|
|
(void) gettimeofday(&t1, NULL);
|
|
send_probe(++seq, hops);
|
|
while ((cc = wait_for_reply(rcvsock, &rcvmhdr))) {
|
|
(void) gettimeofday(&t2, NULL);
|
|
if ((i = packet_ok(&rcvmhdr, cc, seq))) {
|
|
if (!IN6_ARE_ADDR_EQUAL(&Rcv.sin6_addr,
|
|
&lastaddr)) {
|
|
if (probe > 0)
|
|
fputs("\n ", stdout);
|
|
print(&rcvmhdr, cc);
|
|
lastaddr = Rcv.sin6_addr;
|
|
}
|
|
printf(" %.3f 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;
|
|
{
|
|
#ifdef HAVE_POLL
|
|
struct pollfd pfd[1];
|
|
int cc = 0;
|
|
|
|
pfd[0].fd = sock;
|
|
pfd[0].events = POLLIN;
|
|
pfd[0].revents = 0;
|
|
|
|
if (poll(pfd, 1, waittime * 1000) > 0)
|
|
cc = recvmsg(rcvsock, mhdr, 0);
|
|
|
|
return(cc);
|
|
#else
|
|
fd_set *fdsp;
|
|
struct timeval wait;
|
|
int cc = 0, fdsn;
|
|
|
|
fdsn = howmany(sock + 1, NFDBITS) * sizeof(fd_mask);
|
|
if ((fdsp = (fd_set *)malloc(fdsn)) == NULL)
|
|
err(1, "malloc");
|
|
memset(fdsp, 0, fdsn);
|
|
FD_SET(sock, fdsp);
|
|
wait.tv_sec = waittime; wait.tv_usec = 0;
|
|
|
|
if (select(sock+1, fdsp, (fd_set *)0, (fd_set *)0, &wait) > 0)
|
|
cc = recvmsg(rcvsock, mhdr, 0);
|
|
|
|
free(fdsp);
|
|
return(cc);
|
|
#endif
|
|
}
|
|
|
|
#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("%s", 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;
|
|
u_long hops;
|
|
{
|
|
struct icmp6_hdr *icp;
|
|
struct opacket *op;
|
|
struct timeval tv;
|
|
struct tv32 tv32;
|
|
int i;
|
|
|
|
i = hops;
|
|
if (setsockopt(sndsock, IPPROTO_IPV6, IPV6_UNICAST_HOPS,
|
|
(char *)&i, sizeof(i)) < 0) {
|
|
perror("setsockopt IPV6_UNICAST_HOPS");
|
|
}
|
|
|
|
Dst.sin6_port = htons(port + seq);
|
|
(void) gettimeofday(&tv, NULL);
|
|
tv32.tv32_sec = htonl(tv.tv_sec);
|
|
tv32.tv32_usec = htonl(tv.tv_usec);
|
|
|
|
switch (useproto) {
|
|
case IPPROTO_ICMPV6:
|
|
icp = (struct icmp6_hdr *)outpacket;
|
|
|
|
icp->icmp6_type = ICMP6_ECHO_REQUEST;
|
|
icp->icmp6_code = 0;
|
|
icp->icmp6_cksum = 0;
|
|
icp->icmp6_id = ident;
|
|
icp->icmp6_seq = htons(seq);
|
|
bcopy(&tv32, ((u_int8_t *)outpacket + ICMP6ECHOLEN),
|
|
sizeof(tv32));
|
|
break;
|
|
case IPPROTO_UDP:
|
|
op = outpacket;
|
|
|
|
op->seq = seq;
|
|
op->hops = hops;
|
|
bcopy(&tv32, &op->tv, sizeof tv32);
|
|
break;
|
|
case IPPROTO_NONE:
|
|
/* No space for anything. No harm as seq/tv32 are decorative. */
|
|
break;
|
|
default:
|
|
fprintf(stderr, "Unknown probe protocol %d.\n", useproto);
|
|
exit(1);
|
|
}
|
|
|
|
i = sendto(sndsock, (char *)outpacket, datalen, 0,
|
|
(struct sockaddr *)&Dst, Dst.sin6_len);
|
|
if (i < 0 || i != datalen) {
|
|
if (i < 0)
|
|
perror("sendto");
|
|
printf("traceroute6: wrote %s %lu 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;
|
|
{
|
|
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 = "Packet 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 = "Redirect";
|
|
break;
|
|
default:
|
|
cp = "Unknown";
|
|
break;
|
|
}
|
|
return cp;
|
|
}
|
|
|
|
int
|
|
packet_ok(mhdr, cc, seq)
|
|
struct msghdr *mhdr;
|
|
int cc;
|
|
int seq;
|
|
{
|
|
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;
|
|
char hbuf[NI_MAXHOST];
|
|
|
|
#ifdef OLDRAWSOCKET
|
|
int hlen;
|
|
struct ip6_hdr *ip;
|
|
#endif
|
|
|
|
#ifdef OLDRAWSOCKET
|
|
ip = (struct ip6_hdr *) buf;
|
|
hlen = sizeof(struct ip6_hdr);
|
|
if (cc < hlen + sizeof(struct icmp6_hdr)) {
|
|
if (verbose) {
|
|
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
|
|
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
strlcpy(hbuf, "invalid", sizeof(hbuf));
|
|
printf("packet too short (%d bytes) from %s\n", cc,
|
|
hbuf);
|
|
}
|
|
return (0);
|
|
}
|
|
cc -= hlen;
|
|
icp = (struct icmp6_hdr *)(buf + hlen);
|
|
#else
|
|
if (cc < sizeof(struct icmp6_hdr)) {
|
|
if (verbose) {
|
|
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
|
|
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
strlcpy(hbuf, "invalid", sizeof(hbuf));
|
|
printf("data too short (%d bytes) from %s\n", cc, hbuf);
|
|
}
|
|
return(0);
|
|
}
|
|
icp = (struct icmp6_hdr *)buf;
|
|
#endif
|
|
/* 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");
|
|
#if 0
|
|
return(0);
|
|
#else
|
|
rcvhlim = 0; /*XXX*/
|
|
#endif
|
|
}
|
|
else
|
|
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;
|
|
void *up;
|
|
|
|
hip = (struct ip6_hdr *)(icp + 1);
|
|
if ((up = get_uphdr(hip, (u_char *)(buf + cc))) == NULL) {
|
|
if (verbose)
|
|
warnx("failed to get upper layer header");
|
|
return(0);
|
|
}
|
|
switch (useproto) {
|
|
case IPPROTO_ICMPV6:
|
|
if (((struct icmp6_hdr *)up)->icmp6_id == ident &&
|
|
((struct icmp6_hdr *)up)->icmp6_seq == htons(seq))
|
|
return (type == ICMP6_TIME_EXCEEDED ?
|
|
-1 : code + 1);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
if (((struct udphdr *)up)->uh_sport == htons(srcport) &&
|
|
((struct udphdr *)up)->uh_dport == htons(port + seq))
|
|
return (type == ICMP6_TIME_EXCEEDED ?
|
|
-1 : code + 1);
|
|
break;
|
|
case IPPROTO_NONE:
|
|
return (type == ICMP6_TIME_EXCEEDED ? -1 : code + 1);
|
|
default:
|
|
fprintf(stderr, "Unknown probe proto %d.\n", useproto);
|
|
break;
|
|
}
|
|
} else if (useproto == IPPROTO_ICMPV6 && type == ICMP6_ECHO_REPLY) {
|
|
if (icp->icmp6_id == ident &&
|
|
icp->icmp6_seq == htons(seq))
|
|
return (ICMP6_DST_UNREACH_NOPORT + 1);
|
|
}
|
|
if (verbose) {
|
|
char sbuf[NI_MAXHOST+1], dbuf[INET6_ADDRSTRLEN];
|
|
u_int8_t *p;
|
|
int i;
|
|
|
|
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
|
|
sbuf, sizeof(sbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
strlcpy(sbuf, "invalid", sizeof(sbuf));
|
|
printf("\n%d bytes from %s to %s", cc, sbuf,
|
|
rcvpktinfo ? 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);
|
|
p = (u_int8_t *)(icp + 1);
|
|
#define WIDTH 16
|
|
for (i = 0; i < cc; i++) {
|
|
if (i % WIDTH == 0)
|
|
printf("%04x:", i);
|
|
if (i % 4 == 0)
|
|
printf(" ");
|
|
printf("%02x", p[i]);
|
|
if (i % WIDTH == WIDTH - 1)
|
|
printf("\n");
|
|
}
|
|
if (cc % WIDTH != 0)
|
|
printf("\n");
|
|
}
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* Increment pointer until find the UDP or ICMP header.
|
|
*/
|
|
void *
|
|
get_uphdr(ip6, lim)
|
|
struct ip6_hdr *ip6;
|
|
u_char *lim;
|
|
{
|
|
u_char *cp = (u_char *)ip6, nh;
|
|
int hlen;
|
|
static u_char none_hdr[1]; /* Fake pointer for IPPROTO_NONE. */
|
|
|
|
if (cp + sizeof(*ip6) > lim)
|
|
return(NULL);
|
|
|
|
nh = ip6->ip6_nxt;
|
|
cp += sizeof(struct ip6_hdr);
|
|
|
|
while (lim - cp >= (nh == IPPROTO_NONE ? 0 : 8)) {
|
|
switch (nh) {
|
|
case IPPROTO_ESP:
|
|
case IPPROTO_TCP:
|
|
return(NULL);
|
|
case IPPROTO_ICMPV6:
|
|
return(useproto == nh ? cp : NULL);
|
|
case IPPROTO_UDP:
|
|
return(useproto == nh ? cp : NULL);
|
|
case IPPROTO_NONE:
|
|
return(useproto == nh ? none_hdr : NULL);
|
|
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;
|
|
char hbuf[NI_MAXHOST];
|
|
|
|
if (getnameinfo((struct sockaddr *)from, from->sin6_len,
|
|
hbuf, sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0)
|
|
strlcpy(hbuf, "invalid", sizeof(hbuf));
|
|
if (nflag)
|
|
printf(" %s", hbuf);
|
|
else if (lflag)
|
|
printf(" %s (%s)", inetname((struct sockaddr *)from), hbuf);
|
|
else
|
|
printf(" %s", inetname((struct sockaddr *)from));
|
|
|
|
if (verbose) {
|
|
#ifdef OLDRAWSOCKET
|
|
printf(" %d bytes to %s", cc,
|
|
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
|
|
hbuf, sizeof(hbuf)) : "?");
|
|
#else
|
|
printf(" %d bytes of data to %s", cc,
|
|
rcvpktinfo ? inet_ntop(AF_INET6, &rcvpktinfo->ipi6_addr,
|
|
hbuf, sizeof(hbuf)) : "?");
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Construct an Internet address representation.
|
|
* If the nflag has been supplied, give
|
|
* numeric value, otherwise try for symbolic name.
|
|
*/
|
|
const char *
|
|
inetname(sa)
|
|
struct sockaddr *sa;
|
|
{
|
|
static char line[NI_MAXHOST], domain[MAXHOSTNAMELEN + 1];
|
|
static int first = 1;
|
|
char *cp;
|
|
|
|
if (first && !nflag) {
|
|
first = 0;
|
|
if (gethostname(domain, sizeof(domain)) == 0 &&
|
|
(cp = strchr(domain, '.')))
|
|
(void) strlcpy(domain, cp + 1, sizeof(domain));
|
|
else
|
|
domain[0] = 0;
|
|
}
|
|
cp = NULL;
|
|
if (!nflag) {
|
|
if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
|
|
NI_NAMEREQD) == 0) {
|
|
if ((cp = strchr(line, '.')) &&
|
|
!strcmp(cp + 1, domain))
|
|
*cp = 0;
|
|
cp = line;
|
|
}
|
|
}
|
|
if (cp)
|
|
return cp;
|
|
|
|
if (getnameinfo(sa, sa->sa_len, line, sizeof(line), NULL, 0,
|
|
NI_NUMERICHOST) != 0)
|
|
strlcpy(line, "invalid", sizeof(line));
|
|
return line;
|
|
}
|
|
|
|
void
|
|
usage()
|
|
{
|
|
|
|
fprintf(stderr,
|
|
"usage: traceroute6 [-dIlnNrUv] [-f firsthop] [-g gateway] [-m hoplimit]\n"
|
|
" [-p port] [-q probes] [-s src] [-w waittime] target [datalen]\n");
|
|
exit(1);
|
|
}
|