1350 lines
38 KiB
C
1350 lines
38 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000
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* The Regents of the University of California. All rights reserved.
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*
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* Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru>
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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: (1) source code distributions
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* retain the above copyright notice and this paragraph in its entirety, (2)
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* distributions including binary code include the above copyright notice and
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* this paragraph in its entirety in the documentation or other materials
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* provided with the distribution, and (3) all advertising materials mentioning
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* features or use of this software display the following acknowledgement:
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* ``This product includes software developed by the University of California,
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* Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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* the University nor the names of its contributors may be used to endorse
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* or promote products derived from this software without specific prior
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* written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/*
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* traceroute host - trace the route ip packets follow going to "host".
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*
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* Attempt to trace the route an ip packet would follow to some
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* internet host. We find out intermediate hops by launching probe
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* packets with a small ttl (time to live) then listening for an
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* icmp "time exceeded" reply from a gateway. We start our probes
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* with a ttl of one and increase by one until we get an icmp "port
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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@ee.lbl.gov)
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* Tue Dec 20 03:50:13 PST 1988
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*/
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#define TRACEROUTE_SO_DEBUG 0
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/* TODO: undefs were uncommented - ??! we have config system for that! */
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/* probably ok to remove altogether */
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//#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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//#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
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//#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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//#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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//#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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//#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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#include <net/if.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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#include <netinet/ip_icmp.h>
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#include "libbb.h"
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#include "inet_common.h"
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/*
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* Definitions for internet protocol version 4.
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* Per RFC 791, September 1981.
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*/
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#define IPVERSION 4
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#ifndef IPPROTO_ICMP
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/* Grrrr.... */
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#define IPPROTO_ICMP 1
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#endif
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#ifndef IPPROTO_IP
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#define IPPROTO_IP 0
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#endif
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/*
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* Overlay for ip header used by other protocols (tcp, udp).
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*/
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struct ipovly {
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unsigned char ih_x1[9]; /* (unused) */
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unsigned char ih_pr; /* protocol */
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short ih_len; /* protocol length */
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struct in_addr ih_src; /* source internet address */
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struct in_addr ih_dst; /* destination internet address */
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};
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/*
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* UDP kernel structures and variables.
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*/
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struct udpiphdr {
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struct ipovly ui_i; /* overlaid ip structure */
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struct udphdr ui_u; /* udp header */
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};
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#define ui_next ui_i.ih_next
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#define ui_prev ui_i.ih_prev
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#define ui_x1 ui_i.ih_x1
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#define ui_pr ui_i.ih_pr
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#define ui_len ui_i.ih_len
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#define ui_src ui_i.ih_src
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#define ui_dst ui_i.ih_dst
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#define ui_sport ui_u.uh_sport
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#define ui_dport ui_u.uh_dport
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#define ui_ulen ui_u.uh_ulen
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#define ui_sum ui_u.uh_sum
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/* Host name and address list */
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struct hostinfo {
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char *name;
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int n;
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uint32_t *addrs;
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};
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/* Data section of the probe packet */
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typedef struct outdata {
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unsigned char seq; /* sequence number of this packet */
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unsigned char ttl; /* ttl packet left with */
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// UNUSED. Retaining to have the same packet size.
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struct timeval tv_UNUSED PACKED; /* time packet left */
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} outdata_t;
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struct IFADDRLIST {
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uint32_t addr;
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char device[sizeof(struct ifreq)];
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};
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/* Keep in sync with getopt32 call! */
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#define OPT_DONT_FRAGMNT (1<<0) /* F */
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#define OPT_USE_ICMP (1<<1) /* I */
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#define OPT_TTL_FLAG (1<<2) /* l */
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#define OPT_ADDR_NUM (1<<3) /* n */
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#define OPT_BYPASS_ROUTE (1<<4) /* r */
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#define OPT_DEBUG (1<<5) /* d */
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#define OPT_VERBOSE (1<<6) /* v */
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#define OPT_IP_CHKSUM (1<<7) /* x */
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#define OPT_TOS (1<<8) /* t */
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#define OPT_DEVICE (1<<9) /* i */
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#define OPT_MAX_TTL (1<<10) /* m */
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#define OPT_PORT (1<<11) /* p */
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#define OPT_NPROBES (1<<12) /* q */
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#define OPT_SOURCE (1<<13) /* s */
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#define OPT_WAITTIME (1<<14) /* w */
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#define OPT_PAUSE_MS (1<<15) /* z */
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#define OPT_FIRST_TTL (1<<16) /* f */
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#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
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/* use icmp echo instead of udp packets */
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#define useicmp (option_mask32 & OPT_USE_ICMP)
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#endif
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#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
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#define verbose (option_mask32 & OPT_VERBOSE)
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#endif
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#define nflag (option_mask32 & OPT_ADDR_NUM)
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struct globals {
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struct ip *outip; /* last output (udp) packet */
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struct udphdr *outudp; /* last output (udp) packet */
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struct outdata *outdata; /* last output (udp) packet */
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#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
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struct icmp *outicmp; /* last output (icmp) packet */
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#endif
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int rcvsock; /* receive (icmp) socket file descriptor */
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int sndsock; /* send (udp/icmp) socket file descriptor */
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int packlen; /* total length of packet */
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int minpacket; /* min ip packet size */
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int maxpacket; // 32 * 1024; /* max ip packet size */
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int pmtu; /* Path MTU Discovery (RFC1191) */
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char *hostname;
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uint16_t ident;
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uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
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int waittime; // 5; /* time to wait for response (in seconds) */
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int doipcksum; // 1; /* calculate ip checksums by default */
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#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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int optlen; /* length of ip options */
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#else
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#define optlen 0
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#endif
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struct sockaddr_storage whereto; /* Who to try to reach */
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struct sockaddr_storage wherefrom; /* Who we are */
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/* last inbound (icmp) packet */
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unsigned char packet[512];
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#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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/* Maximum number of gateways (include room for one noop) */
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#define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
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/* loose source route gateway list (including room for final destination) */
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uint32_t gwlist[NGATEWAYS + 1];
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#endif
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};
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#define G (*ptr_to_globals)
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#define outip (G.outip )
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#define outudp (G.outudp )
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#define outdata (G.outdata )
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#define outicmp (G.outicmp )
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#define rcvsock (G.rcvsock )
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#define sndsock (G.sndsock )
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#define packlen (G.packlen )
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#define minpacket (G.minpacket)
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#define maxpacket (G.maxpacket)
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#define pmtu (G.pmtu )
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#define hostname (G.hostname )
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#define ident (G.ident )
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#define port (G.port )
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#define waittime (G.waittime )
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#define doipcksum (G.doipcksum)
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#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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#define optlen (G.optlen )
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#endif
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#define packet (G.packet )
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#define whereto (G.whereto )
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#define wherefrom (G.wherefrom)
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#define gwlist (G.gwlist )
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#define INIT_G() do { \
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SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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maxpacket = 32 * 1024; \
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port = 32768 + 666; \
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waittime = 5; \
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doipcksum = 1; \
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} while (0)
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/*
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* Return the interface list
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*/
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static int
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ifaddrlist(struct IFADDRLIST **ipaddrp)
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{
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enum { IFREQ_BUFSIZE = (32 * 1024) / sizeof(struct ifreq) };
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int fd, nipaddr;
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#ifdef HAVE_SOCKADDR_SA_LEN
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int n;
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#endif
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struct ifreq *ifrp, *ifend, *ifnext;
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struct sockaddr_in *addr_sin;
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struct IFADDRLIST *al;
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struct ifconf ifc;
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struct ifreq ifr;
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/* Was on stack, but 32k is a bit too much: */
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struct ifreq *ibuf = xmalloc(IFREQ_BUFSIZE * sizeof(ibuf[0]));
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struct IFADDRLIST *st_ifaddrlist;
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fd = xsocket(AF_INET, SOCK_DGRAM, 0);
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ifc.ifc_len = IFREQ_BUFSIZE * sizeof(ibuf[0]);
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ifc.ifc_buf = (caddr_t)ibuf;
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if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0
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|| ifc.ifc_len < (int)sizeof(struct ifreq)
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) {
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if (errno == EINVAL)
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bb_error_msg_and_die(
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"SIOCGIFCONF: ifreq struct too small (%u bytes)",
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(unsigned)(IFREQ_BUFSIZE * sizeof(ibuf[0])));
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bb_perror_msg_and_die("SIOCGIFCONF");
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}
|
|
ifrp = ibuf;
|
|
ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
|
|
|
|
nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq));
|
|
st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST));
|
|
al = st_ifaddrlist;
|
|
nipaddr = 0;
|
|
|
|
for (; ifrp < ifend; ifrp = ifnext) {
|
|
#ifdef HAVE_SOCKADDR_SA_LEN
|
|
n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
|
|
if (n < sizeof(*ifrp))
|
|
ifnext = ifrp + 1;
|
|
else
|
|
ifnext = (struct ifreq *)((char *)ifrp + n);
|
|
if (ifrp->ifr_addr.sa_family != AF_INET)
|
|
continue;
|
|
#else
|
|
ifnext = ifrp + 1;
|
|
#endif
|
|
/*
|
|
* Need a template to preserve address info that is
|
|
* used below to locate the next entry. (Otherwise,
|
|
* SIOCGIFFLAGS stomps over it because the requests
|
|
* are returned in a union.)
|
|
*/
|
|
strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
|
|
if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
|
|
if (errno == ENXIO)
|
|
continue;
|
|
bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s",
|
|
(int)sizeof(ifr.ifr_name), ifr.ifr_name);
|
|
}
|
|
|
|
/* Must be up */
|
|
if ((ifr.ifr_flags & IFF_UP) == 0)
|
|
continue;
|
|
|
|
safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1);
|
|
#ifdef sun
|
|
/* Ignore sun virtual interfaces */
|
|
if (strchr(al->device, ':') != NULL)
|
|
continue;
|
|
#endif
|
|
ioctl_or_perror_and_die(fd, SIOCGIFADDR, (char *)&ifr,
|
|
"SIOCGIFADDR: %s", al->device);
|
|
|
|
addr_sin = (struct sockaddr_in *)&ifr.ifr_addr;
|
|
al->addr = addr_sin->sin_addr.s_addr;
|
|
++al;
|
|
++nipaddr;
|
|
}
|
|
if (nipaddr == 0)
|
|
bb_error_msg_and_die("can't find any network interfaces");
|
|
|
|
free(ibuf);
|
|
close(fd);
|
|
*ipaddrp = st_ifaddrlist;
|
|
return nipaddr;
|
|
}
|
|
|
|
|
|
static void
|
|
setsin(struct sockaddr_in *addr_sin, uint32_t addr)
|
|
{
|
|
memset(addr_sin, 0, sizeof(*addr_sin));
|
|
#ifdef HAVE_SOCKADDR_SA_LEN
|
|
addr_sin->sin_len = sizeof(*addr_sin);
|
|
#endif
|
|
addr_sin->sin_family = AF_INET;
|
|
addr_sin->sin_addr.s_addr = addr;
|
|
}
|
|
|
|
|
|
/*
|
|
* Return the source address for the given destination address
|
|
*/
|
|
static void
|
|
findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
|
|
{
|
|
int i, n;
|
|
FILE *f;
|
|
uint32_t mask;
|
|
uint32_t dest, tmask;
|
|
struct IFADDRLIST *al;
|
|
char buf[256], tdevice[256], device[256];
|
|
|
|
f = xfopen_for_read("/proc/net/route");
|
|
|
|
/* Find the appropriate interface */
|
|
n = 0;
|
|
mask = 0;
|
|
device[0] = '\0';
|
|
while (fgets(buf, sizeof(buf), f) != NULL) {
|
|
++n;
|
|
if (n == 1 && strncmp(buf, "Iface", 5) == 0)
|
|
continue;
|
|
i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x",
|
|
tdevice, &dest, &tmask);
|
|
if (i != 3)
|
|
bb_error_msg_and_die("junk in buffer");
|
|
if ((to->sin_addr.s_addr & tmask) == dest
|
|
&& (tmask > mask || mask == 0)
|
|
) {
|
|
mask = tmask;
|
|
strcpy(device, tdevice);
|
|
}
|
|
}
|
|
fclose(f);
|
|
|
|
if (device[0] == '\0')
|
|
bb_error_msg_and_die("can't find interface");
|
|
|
|
/* Get the interface address list */
|
|
n = ifaddrlist(&al);
|
|
|
|
/* Find our appropriate source address */
|
|
for (i = n; i > 0; --i, ++al)
|
|
if (strcmp(device, al->device) == 0)
|
|
break;
|
|
if (i <= 0)
|
|
bb_error_msg_and_die("can't find interface %s", device);
|
|
|
|
setsin(from, al->addr);
|
|
}
|
|
|
|
/*
|
|
"Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n"
|
|
"\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n"
|
|
"\t[-w waittime] [-z pausemsecs] host [packetlen]"
|
|
|
|
*/
|
|
|
|
static int
|
|
wait_for_reply(int sock, struct sockaddr_in *fromp)
|
|
{
|
|
struct pollfd pfd[1];
|
|
int cc = 0;
|
|
socklen_t fromlen = sizeof(*fromp);
|
|
|
|
pfd[0].fd = sock;
|
|
pfd[0].events = POLLIN;
|
|
if (safe_poll(pfd, 1, waittime * 1000) > 0)
|
|
cc = recvfrom(sock, packet, sizeof(packet), 0,
|
|
(struct sockaddr *)fromp, &fromlen);
|
|
return cc;
|
|
}
|
|
|
|
/*
|
|
* Checksum routine for Internet Protocol family headers (C Version)
|
|
*/
|
|
static uint16_t
|
|
in_cksum(uint16_t *addr, int len)
|
|
{
|
|
int nleft = len;
|
|
uint16_t *w = addr;
|
|
uint16_t answer;
|
|
int sum = 0;
|
|
|
|
/*
|
|
* Our algorithm is simple, using a 32 bit accumulator (sum),
|
|
* we add sequential 16 bit words to it, and at the end, fold
|
|
* back all the carry bits from the top 16 bits into the lower
|
|
* 16 bits.
|
|
*/
|
|
while (nleft > 1) {
|
|
sum += *w++;
|
|
nleft -= 2;
|
|
}
|
|
|
|
/* mop up an odd byte, if necessary */
|
|
if (nleft == 1)
|
|
sum += *(unsigned char *)w;
|
|
|
|
/*
|
|
* add back carry outs from top 16 bits to low 16 bits
|
|
*/
|
|
sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
|
|
sum += (sum >> 16); /* add carry */
|
|
answer = ~sum; /* truncate to 16 bits */
|
|
return answer;
|
|
}
|
|
|
|
|
|
static void
|
|
send_probe(int seq, int ttl)
|
|
{
|
|
int cc;
|
|
struct udpiphdr *ui, *oui;
|
|
struct ip tip;
|
|
|
|
outip->ip_ttl = ttl;
|
|
outip->ip_id = htons(ident + seq);
|
|
|
|
/*
|
|
* In most cases, the kernel will recalculate the ip checksum.
|
|
* But we must do it anyway so that the udp checksum comes out
|
|
* right.
|
|
*/
|
|
if (doipcksum) {
|
|
outip->ip_sum =
|
|
in_cksum((uint16_t *)outip, sizeof(*outip) + optlen);
|
|
if (outip->ip_sum == 0)
|
|
outip->ip_sum = 0xffff;
|
|
}
|
|
|
|
/* Payload */
|
|
outdata->seq = seq;
|
|
outdata->ttl = ttl;
|
|
// UNUSED: was storing gettimeofday's result there, but never ever checked it
|
|
/*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
|
if (useicmp)
|
|
outicmp->icmp_seq = htons(seq);
|
|
else
|
|
#endif
|
|
outudp->dest = htons(port + seq);
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
|
if (useicmp) {
|
|
/* Always calculate checksum for icmp packets */
|
|
outicmp->icmp_cksum = 0;
|
|
outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
|
|
packlen - (sizeof(*outip) + optlen));
|
|
if (outicmp->icmp_cksum == 0)
|
|
outicmp->icmp_cksum = 0xffff;
|
|
} else
|
|
#endif
|
|
if (doipcksum) {
|
|
/* Checksum (we must save and restore ip header) */
|
|
tip = *outip;
|
|
ui = (struct udpiphdr *)outip;
|
|
oui = (struct udpiphdr *)&tip;
|
|
/* Easier to zero and put back things that are ok */
|
|
memset((char *)ui, 0, sizeof(ui->ui_i));
|
|
ui->ui_src = oui->ui_src;
|
|
ui->ui_dst = oui->ui_dst;
|
|
ui->ui_pr = oui->ui_pr;
|
|
ui->ui_len = outudp->len;
|
|
outudp->check = 0;
|
|
outudp->check = in_cksum((uint16_t *)ui, packlen);
|
|
if (outudp->check == 0)
|
|
outudp->check = 0xffff;
|
|
*outip = tip;
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
/* XXX undocumented debugging hack */
|
|
if (verbose > 1) {
|
|
const uint16_t *sp;
|
|
int nshorts, i;
|
|
|
|
sp = (uint16_t *)outip;
|
|
nshorts = (unsigned)packlen / sizeof(uint16_t);
|
|
i = 0;
|
|
printf("[ %d bytes", packlen);
|
|
while (--nshorts >= 0) {
|
|
if ((i++ % 8) == 0)
|
|
printf("\n\t");
|
|
printf(" %04x", ntohs(*sp));
|
|
sp++;
|
|
}
|
|
if (packlen & 1) {
|
|
if ((i % 8) == 0)
|
|
printf("\n\t");
|
|
printf(" %02x", *(unsigned char *)sp);
|
|
}
|
|
printf("]\n");
|
|
}
|
|
#endif
|
|
|
|
#if !defined(IP_HDRINCL) && defined(IP_TTL)
|
|
if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
|
|
(char *)&ttl, sizeof(ttl)) < 0) {
|
|
bb_perror_msg_and_die("setsockopt ttl %d", ttl);
|
|
}
|
|
#endif
|
|
|
|
cc = xsendto(sndsock, (char *)outip,
|
|
packlen, (struct sockaddr *)&whereto, sizeof(whereto));
|
|
if (cc != packlen) {
|
|
bb_info_msg("wrote %s %d chars, ret=%d", hostname, packlen, cc);
|
|
}
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
/*
|
|
* Convert an ICMP "type" field to a printable string.
|
|
*/
|
|
static inline const char *
|
|
pr_type(unsigned char t)
|
|
{
|
|
static const char *const ttab[] = {
|
|
"Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
|
|
"Source Quench", "Redirect", "ICMP 6", "ICMP 7",
|
|
"Echo", "Router Advert", "Router Solicit", "Time Exceeded",
|
|
"Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
|
|
"Info Reply", "Mask Request", "Mask Reply"
|
|
};
|
|
|
|
if (t > 18)
|
|
return "OUT-OF-RANGE";
|
|
|
|
return ttab[t];
|
|
}
|
|
#endif
|
|
|
|
#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
#define packet_ok(buf, cc, from, seq) \
|
|
packet_ok(buf, cc, seq)
|
|
#endif
|
|
static int
|
|
packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq)
|
|
{
|
|
struct icmp *icp;
|
|
unsigned char type, code;
|
|
int hlen;
|
|
struct ip *ip;
|
|
|
|
ip = (struct ip *) buf;
|
|
hlen = ip->ip_hl << 2;
|
|
if (cc < hlen + ICMP_MINLEN) {
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
if (verbose)
|
|
printf("packet too short (%d bytes) from %s\n", cc,
|
|
inet_ntoa(from->sin_addr));
|
|
#endif
|
|
return 0;
|
|
}
|
|
cc -= hlen;
|
|
icp = (struct icmp *)(buf + hlen);
|
|
type = icp->icmp_type;
|
|
code = icp->icmp_code;
|
|
/* Path MTU Discovery (RFC1191) */
|
|
if (code != ICMP_UNREACH_NEEDFRAG)
|
|
pmtu = 0;
|
|
else {
|
|
pmtu = ntohs(icp->icmp_nextmtu);
|
|
}
|
|
if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
|
|
type == ICMP_UNREACH || type == ICMP_ECHOREPLY) {
|
|
struct ip *hip;
|
|
struct udphdr *up;
|
|
|
|
hip = &icp->icmp_ip;
|
|
hlen = hip->ip_hl << 2;
|
|
#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
|
if (useicmp) {
|
|
struct icmp *hicmp;
|
|
|
|
/* XXX */
|
|
if (type == ICMP_ECHOREPLY &&
|
|
icp->icmp_id == htons(ident) &&
|
|
icp->icmp_seq == htons(seq))
|
|
return -2;
|
|
|
|
hicmp = (struct icmp *)((unsigned char *)hip + hlen);
|
|
/* XXX 8 is a magic number */
|
|
if (hlen + 8 <= cc &&
|
|
hip->ip_p == IPPROTO_ICMP &&
|
|
hicmp->icmp_id == htons(ident) &&
|
|
hicmp->icmp_seq == htons(seq))
|
|
return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
|
} else
|
|
#endif
|
|
{
|
|
up = (struct udphdr *)((unsigned char *)hip + hlen);
|
|
/* XXX 8 is a magic number */
|
|
if (hlen + 12 <= cc &&
|
|
hip->ip_p == IPPROTO_UDP &&
|
|
up->source == htons(ident) &&
|
|
up->dest == htons(port + seq))
|
|
return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
|
}
|
|
}
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
if (verbose) {
|
|
int i;
|
|
uint32_t *lp = (uint32_t *)&icp->icmp_ip;
|
|
|
|
printf("\n%d bytes from %s to "
|
|
"%s: icmp type %d (%s) code %d\n",
|
|
cc, inet_ntoa(from->sin_addr),
|
|
inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code);
|
|
for (i = 4; i < cc; i += sizeof(*lp))
|
|
printf("%2d: x%8.8x\n", i, *lp++);
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Construct an Internet address representation.
|
|
* If the nflag has been supplied, give
|
|
* numeric value, otherwise try for symbolic name.
|
|
*/
|
|
static void
|
|
print_inetname(struct sockaddr_in *from)
|
|
{
|
|
const char *ina;
|
|
|
|
ina = inet_ntoa(from->sin_addr);
|
|
if (nflag)
|
|
printf(" %s", ina);
|
|
else {
|
|
char *n = NULL;
|
|
if (from->sin_addr.s_addr != INADDR_ANY)
|
|
n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
|
|
printf(" %s (%s)", (n ? n : ina), ina);
|
|
free(n);
|
|
}
|
|
}
|
|
|
|
static void
|
|
print(unsigned char *buf, int cc, struct sockaddr_in *from)
|
|
{
|
|
struct ip *ip;
|
|
int hlen;
|
|
|
|
ip = (struct ip *) buf;
|
|
hlen = ip->ip_hl << 2;
|
|
cc -= hlen;
|
|
|
|
print_inetname(from);
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
if (verbose)
|
|
printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));
|
|
#endif
|
|
}
|
|
|
|
|
|
static struct hostinfo *
|
|
gethostinfo(const char *host)
|
|
{
|
|
int n;
|
|
struct hostent *hp;
|
|
struct hostinfo *hi;
|
|
char **p;
|
|
uint32_t addr, *ap;
|
|
|
|
hi = xzalloc(sizeof(*hi));
|
|
addr = inet_addr(host);
|
|
if (addr != 0xffffffff) {
|
|
hi->name = xstrdup(host);
|
|
hi->n = 1;
|
|
hi->addrs = xzalloc(sizeof(hi->addrs[0]));
|
|
hi->addrs[0] = addr;
|
|
return hi;
|
|
}
|
|
|
|
hp = xgethostbyname(host);
|
|
if (hp->h_addrtype != AF_INET || hp->h_length != 4)
|
|
bb_perror_msg_and_die("bad host %s", host);
|
|
hi->name = xstrdup(hp->h_name);
|
|
for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
|
|
continue;
|
|
hi->n = n;
|
|
hi->addrs = xzalloc(n * sizeof(hi->addrs[0]));
|
|
for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
|
|
memcpy(ap, *p, sizeof(*ap));
|
|
return hi;
|
|
}
|
|
|
|
static void
|
|
freehostinfo(struct hostinfo *hi)
|
|
{
|
|
free(hi->name);
|
|
free(hi->addrs);
|
|
free(hi);
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
static void
|
|
getaddr(uint32_t *ap, const char *host)
|
|
{
|
|
struct hostinfo *hi;
|
|
|
|
hi = gethostinfo(host);
|
|
*ap = hi->addrs[0];
|
|
freehostinfo(hi);
|
|
}
|
|
#endif
|
|
|
|
static void
|
|
print_delta_ms(unsigned t1p, unsigned t2p)
|
|
{
|
|
unsigned tt = t2p - t1p;
|
|
printf(" %u.%03u ms", tt/1000, tt%1000);
|
|
}
|
|
|
|
int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int traceroute_main(int argc, char **argv)
|
|
{
|
|
int code, n;
|
|
unsigned char *outp;
|
|
uint32_t *ap;
|
|
struct sockaddr_in *from;
|
|
struct sockaddr_in *to;
|
|
struct hostinfo *hi;
|
|
int ttl, probe, i;
|
|
int seq = 0;
|
|
int tos = 0;
|
|
char *tos_str;
|
|
char *source;
|
|
unsigned op;
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
int lsrr = 0;
|
|
#endif
|
|
uint16_t off = 0;
|
|
struct IFADDRLIST *al;
|
|
char *device;
|
|
int max_ttl = 30;
|
|
char *max_ttl_str;
|
|
char *port_str;
|
|
int nprobes = 3;
|
|
char *nprobes_str;
|
|
char *waittime_str;
|
|
unsigned pausemsecs = 0;
|
|
char *pausemsecs_str;
|
|
int first_ttl = 1;
|
|
char *first_ttl_str;
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
llist_t *source_route_list = NULL;
|
|
#endif
|
|
|
|
INIT_G();
|
|
from = (struct sockaddr_in *)&wherefrom;
|
|
to = (struct sockaddr_in *)&whereto;
|
|
|
|
//opterr = 0;
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
opt_complementary = "x-x:g::";
|
|
#else
|
|
opt_complementary = "x-x";
|
|
#endif
|
|
|
|
op = getopt32(argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:"
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
"g:"
|
|
#endif
|
|
, &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
|
|
, &source, &waittime_str, &pausemsecs_str, &first_ttl_str
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
, &source_route_list
|
|
#endif
|
|
);
|
|
|
|
if (op & OPT_DONT_FRAGMNT)
|
|
off = IP_DF;
|
|
if (op & OPT_IP_CHKSUM) {
|
|
doipcksum = 0;
|
|
bb_error_msg("warning: ip checksums disabled");
|
|
}
|
|
if (op & OPT_TOS)
|
|
tos = xatou_range(tos_str, 0, 255);
|
|
if (op & OPT_MAX_TTL)
|
|
max_ttl = xatou_range(max_ttl_str, 1, 255);
|
|
if (op & OPT_PORT)
|
|
port = xatou16(port_str);
|
|
if (op & OPT_NPROBES)
|
|
nprobes = xatou_range(nprobes_str, 1, INT_MAX);
|
|
if (op & OPT_SOURCE) {
|
|
/*
|
|
* set the ip source address of the outbound
|
|
* probe (e.g., on a multi-homed host).
|
|
*/
|
|
if (getuid())
|
|
bb_error_msg_and_die("-s %s: permission denied", source);
|
|
}
|
|
if (op & OPT_WAITTIME)
|
|
waittime = xatou_range(waittime_str, 2, 24 * 60 * 60);
|
|
if (op & OPT_PAUSE_MS)
|
|
pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
|
|
if (op & OPT_FIRST_TTL)
|
|
first_ttl = xatou_range(first_ttl_str, 1, 255);
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
if (source_route_list) {
|
|
while (source_route_list) {
|
|
if (lsrr >= NGATEWAYS)
|
|
bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
|
|
getaddr(gwlist + lsrr, llist_pop(&source_route_list));
|
|
++lsrr;
|
|
}
|
|
optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
|
}
|
|
#endif
|
|
|
|
if (first_ttl > max_ttl) {
|
|
bb_error_msg_and_die(
|
|
"first ttl (%d) may not be greater than max ttl (%d)",
|
|
first_ttl, max_ttl);
|
|
}
|
|
|
|
minpacket = sizeof(*outip) + sizeof(*outdata) + optlen;
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
|
if (useicmp)
|
|
minpacket += 8; /* XXX magic number */
|
|
else
|
|
#endif
|
|
minpacket += sizeof(*outudp);
|
|
packlen = minpacket; /* minimum sized packet */
|
|
|
|
/* Process destination and optional packet size */
|
|
switch (argc - optind) {
|
|
|
|
case 2:
|
|
packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket);
|
|
/* Fall through */
|
|
|
|
case 1:
|
|
hostname = argv[optind];
|
|
hi = gethostinfo(hostname);
|
|
setsin(to, hi->addrs[0]);
|
|
if (hi->n > 1)
|
|
bb_error_msg("warning: %s has multiple addresses; using %s",
|
|
hostname, inet_ntoa(to->sin_addr));
|
|
hostname = hi->name;
|
|
hi->name = NULL;
|
|
freehostinfo(hi);
|
|
break;
|
|
|
|
default:
|
|
bb_show_usage();
|
|
}
|
|
|
|
/* Ensure the socket fds won't be 0, 1 or 2 */
|
|
bb_sanitize_stdio();
|
|
|
|
rcvsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
|
|
|
|
#if TRACEROUTE_SO_DEBUG
|
|
if (op & OPT_DEBUG)
|
|
setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
|
|
&const_int_1, sizeof(const_int_1));
|
|
#endif
|
|
if (op & OPT_BYPASS_ROUTE)
|
|
setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
|
|
&const_int_1, sizeof(const_int_1));
|
|
|
|
sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
#if defined(IP_OPTIONS)
|
|
if (lsrr > 0) {
|
|
unsigned char optlist[MAX_IPOPTLEN];
|
|
|
|
/* final hop */
|
|
gwlist[lsrr] = to->sin_addr.s_addr;
|
|
++lsrr;
|
|
|
|
/* force 4 byte alignment */
|
|
optlist[0] = IPOPT_NOP;
|
|
/* loose source route option */
|
|
optlist[1] = IPOPT_LSRR;
|
|
i = lsrr * sizeof(gwlist[0]);
|
|
optlist[2] = i + 3;
|
|
/* Pointer to LSRR addresses */
|
|
optlist[3] = IPOPT_MINOFF;
|
|
memcpy(optlist + 4, gwlist, i);
|
|
|
|
if ((setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
|
|
(char *)optlist, i + sizeof(gwlist[0]))) < 0) {
|
|
bb_perror_msg_and_die("IP_OPTIONS");
|
|
}
|
|
}
|
|
#endif /* IP_OPTIONS */
|
|
#endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */
|
|
|
|
#ifdef SO_SNDBUF
|
|
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
|
|
bb_perror_msg_and_die("SO_SNDBUF");
|
|
}
|
|
#endif
|
|
#ifdef IP_HDRINCL
|
|
if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, &const_int_1, sizeof(const_int_1)) < 0
|
|
&& errno != ENOPROTOOPT
|
|
) {
|
|
bb_perror_msg_and_die("IP_HDRINCL");
|
|
}
|
|
#else
|
|
#ifdef IP_TOS
|
|
if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
|
|
bb_perror_msg_and_die("setsockopt tos %d", tos);
|
|
}
|
|
#endif
|
|
#endif
|
|
#if TRACEROUTE_SO_DEBUG
|
|
if (op & OPT_DEBUG)
|
|
setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
|
|
&const_int_1, sizeof(const_int_1));
|
|
#endif
|
|
if (op & OPT_BYPASS_ROUTE)
|
|
setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
|
|
&const_int_1, sizeof(const_int_1));
|
|
|
|
/* Revert to non-privileged user after opening sockets */
|
|
xsetgid(getgid());
|
|
xsetuid(getuid());
|
|
|
|
outip = xzalloc(packlen);
|
|
|
|
outip->ip_v = IPVERSION;
|
|
if (tos_str)
|
|
outip->ip_tos = tos;
|
|
outip->ip_len = htons(packlen);
|
|
outip->ip_off = htons(off);
|
|
outp = (unsigned char *)(outip + 1);
|
|
outip->ip_dst = to->sin_addr;
|
|
|
|
outip->ip_hl = (outp - (unsigned char *)outip) >> 2;
|
|
ident = (getpid() & 0xffff) | 0x8000;
|
|
#if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
|
if (useicmp) {
|
|
outip->ip_p = IPPROTO_ICMP;
|
|
outicmp = (struct icmp *)outp;
|
|
outicmp->icmp_type = ICMP_ECHO;
|
|
outicmp->icmp_id = htons(ident);
|
|
outdata = (outdata_t *)(outp + 8); /* XXX magic number */
|
|
} else
|
|
#endif
|
|
{
|
|
outip->ip_p = IPPROTO_UDP;
|
|
outudp = (struct udphdr *)outp;
|
|
outudp->source = htons(ident);
|
|
outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen)));
|
|
outdata = (outdata_t *)(outudp + 1);
|
|
}
|
|
|
|
/* Get the interface address list */
|
|
n = ifaddrlist(&al);
|
|
|
|
/* Look for a specific device */
|
|
if (op & OPT_DEVICE) {
|
|
for (i = n; i > 0; --i, ++al)
|
|
if (strcmp(device, al->device) == 0)
|
|
goto found_dev;
|
|
bb_error_msg_and_die("can't find interface %s", device);
|
|
}
|
|
found_dev:
|
|
|
|
/* Determine our source address */
|
|
if (!(op & OPT_SOURCE)) {
|
|
/*
|
|
* If a device was specified, use the interface address.
|
|
* Otherwise, try to determine our source address.
|
|
*/
|
|
if (op & OPT_DEVICE)
|
|
setsin(from, al->addr);
|
|
findsaddr(to, from);
|
|
} else {
|
|
hi = gethostinfo(source);
|
|
source = hi->name;
|
|
hi->name = NULL;
|
|
/*
|
|
* If the device was specified make sure it
|
|
* corresponds to the source address specified.
|
|
* Otherwise, use the first address (and warn if
|
|
* there are more than one).
|
|
*/
|
|
if (op & OPT_DEVICE) {
|
|
for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
|
|
if (*ap == al->addr)
|
|
goto found_dev2;
|
|
bb_error_msg_and_die("%s is not on interface %s",
|
|
source, device);
|
|
found_dev2:
|
|
setsin(from, *ap);
|
|
} else {
|
|
setsin(from, hi->addrs[0]);
|
|
if (hi->n > 1)
|
|
bb_error_msg(
|
|
"warning: %s has multiple addresses; using %s",
|
|
source, inet_ntoa(from->sin_addr));
|
|
}
|
|
freehostinfo(hi);
|
|
}
|
|
|
|
outip->ip_src = from->sin_addr;
|
|
#ifndef IP_HDRINCL
|
|
xbind(sndsock, (struct sockaddr *)from, sizeof(*from));
|
|
#endif
|
|
|
|
printf("traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr));
|
|
if (op & OPT_SOURCE)
|
|
printf(" from %s", source);
|
|
printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
|
|
fflush(stdout);
|
|
|
|
for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
|
uint32_t lastaddr = 0;
|
|
int gotlastaddr = 0;
|
|
int got_there = 0;
|
|
int unreachable = 0;
|
|
int sentfirst = 0;
|
|
|
|
printf("%2d ", ttl);
|
|
for (probe = 0; probe < nprobes; ++probe) {
|
|
int cc;
|
|
unsigned t1;
|
|
unsigned t2;
|
|
struct ip *ip;
|
|
|
|
if (sentfirst && pausemsecs > 0)
|
|
usleep(pausemsecs * 1000);
|
|
t1 = monotonic_us();
|
|
send_probe(++seq, ttl);
|
|
++sentfirst;
|
|
while ((cc = wait_for_reply(rcvsock, from)) != 0) {
|
|
t2 = monotonic_us();
|
|
i = packet_ok(packet, cc, from, seq);
|
|
/* Skip short packet */
|
|
if (i == 0)
|
|
continue;
|
|
if (!gotlastaddr ||
|
|
from->sin_addr.s_addr != lastaddr) {
|
|
print(packet, cc, from);
|
|
lastaddr = from->sin_addr.s_addr;
|
|
++gotlastaddr;
|
|
}
|
|
print_delta_ms(t1, t2);
|
|
ip = (struct ip *)packet;
|
|
if (op & OPT_TTL_FLAG)
|
|
printf(" (%d)", ip->ip_ttl);
|
|
if (i == -2) {
|
|
if (ip->ip_ttl <= 1)
|
|
printf(" !");
|
|
++got_there;
|
|
break;
|
|
}
|
|
/* time exceeded in transit */
|
|
if (i == -1)
|
|
break;
|
|
code = i - 1;
|
|
switch (code) {
|
|
|
|
case ICMP_UNREACH_PORT:
|
|
if (ip->ip_ttl <= 1)
|
|
printf(" !");
|
|
++got_there;
|
|
break;
|
|
|
|
case ICMP_UNREACH_NET:
|
|
++unreachable;
|
|
printf(" !N");
|
|
break;
|
|
|
|
case ICMP_UNREACH_HOST:
|
|
++unreachable;
|
|
printf(" !H");
|
|
break;
|
|
|
|
case ICMP_UNREACH_PROTOCOL:
|
|
++got_there;
|
|
printf(" !P");
|
|
break;
|
|
|
|
case ICMP_UNREACH_NEEDFRAG:
|
|
++unreachable;
|
|
printf(" !F-%d", pmtu);
|
|
break;
|
|
|
|
case ICMP_UNREACH_SRCFAIL:
|
|
++unreachable;
|
|
printf(" !S");
|
|
break;
|
|
|
|
case ICMP_UNREACH_FILTER_PROHIB:
|
|
case ICMP_UNREACH_NET_PROHIB: /* misuse */
|
|
++unreachable;
|
|
printf(" !A");
|
|
break;
|
|
|
|
case ICMP_UNREACH_HOST_PROHIB:
|
|
++unreachable;
|
|
printf(" !C");
|
|
break;
|
|
|
|
case ICMP_UNREACH_HOST_PRECEDENCE:
|
|
++unreachable;
|
|
printf(" !V");
|
|
break;
|
|
|
|
case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
|
++unreachable;
|
|
printf(" !C");
|
|
break;
|
|
|
|
case ICMP_UNREACH_NET_UNKNOWN:
|
|
case ICMP_UNREACH_HOST_UNKNOWN:
|
|
++unreachable;
|
|
printf(" !U");
|
|
break;
|
|
|
|
case ICMP_UNREACH_ISOLATED:
|
|
++unreachable;
|
|
printf(" !I");
|
|
break;
|
|
|
|
case ICMP_UNREACH_TOSNET:
|
|
case ICMP_UNREACH_TOSHOST:
|
|
++unreachable;
|
|
printf(" !T");
|
|
break;
|
|
|
|
default:
|
|
++unreachable;
|
|
printf(" !<%d>", code);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (cc == 0)
|
|
printf(" *");
|
|
(void)fflush(stdout);
|
|
}
|
|
bb_putchar('\n');
|
|
if (got_there ||
|
|
(unreachable > 0 && unreachable >= nprobes - 1))
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|