1235 lines
37 KiB
C
1235 lines
37 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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* traceroute6
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*
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* Modified for NRL 4.4BSD IPv6 release.
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* 07/31/96 bgp
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*
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* Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt>
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* 31/07/1996
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*
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* As ICMP error messages for IPv6 now include more than 8 bytes
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* UDP datagrams are now sent via an UDP socket instead of magic
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* RAW socket tricks.
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*
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* Converted to busybox applet by Leonid Lisovskiy <lly@sf.net>
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* 2009-11-16
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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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//usage:#define traceroute_trivial_usage
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//usage: "[-"IF_TRACEROUTE6("46")"FIldnrv] [-f 1ST_TTL] [-m MAXTTL] [-p PORT] [-q PROBES]\n"
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//usage: " [-s SRC_IP] [-t TOS] [-w WAIT_SEC] [-g GATEWAY] [-i IFACE]\n"
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//usage: " [-z PAUSE_MSEC] HOST [BYTES]"
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//usage:#define traceroute_full_usage "\n\n"
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//usage: "Trace the route to HOST\n"
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//usage: IF_TRACEROUTE6(
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//usage: "\n -4,-6 Force IP or IPv6 name resolution"
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//usage: )
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//usage: "\n -F Set the don't fragment bit"
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//usage: "\n -I Use ICMP ECHO instead of UDP datagrams"
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//usage: "\n -l Display the TTL value of the returned packet"
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//usage: "\n -d Set SO_DEBUG options to socket"
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//usage: "\n -n Print numeric addresses"
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//usage: "\n -r Bypass routing tables, send directly to HOST"
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//usage: "\n -v Verbose"
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//usage: "\n -m Max time-to-live (max number of hops)"
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//usage: "\n -p Base UDP port number used in probes"
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//usage: "\n (default 33434)"
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//usage: "\n -q Number of probes per TTL (default 3)"
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//usage: "\n -s IP address to use as the source address"
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//usage: "\n -t Type-of-service in probe packets (default 0)"
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//usage: "\n -w Time in seconds to wait for a response (default 3)"
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//usage: "\n -g Loose source route gateway (8 max)"
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//usage:
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//usage:#define traceroute6_trivial_usage
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//usage: "[-dnrv] [-m MAXTTL] [-p PORT] [-q PROBES]\n"
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//usage: " [-s SRC_IP] [-t TOS] [-w WAIT_SEC] [-i IFACE]\n"
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//usage: " HOST [BYTES]"
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//usage:#define traceroute6_full_usage "\n\n"
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//usage: "Trace the route to HOST\n"
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//usage: "\n -d Set SO_DEBUG options to socket"
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//usage: "\n -n Print numeric addresses"
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//usage: "\n -r Bypass routing tables, send directly to HOST"
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//usage: "\n -v Verbose"
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//usage: "\n -m Max time-to-live (max number of hops)"
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//usage: "\n -p Base UDP port number used in probes"
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//usage: "\n (default is 33434)"
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//usage: "\n -q Number of probes per TTL (default 3)"
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//usage: "\n -s IP address to use as the source address"
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//usage: "\n -t Type-of-service in probe packets (default 0)"
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//usage: "\n -w Time in seconds to wait for a response (default 3)"
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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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#if ENABLE_FEATURE_IPV6
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# include <netinet/ip6.h>
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# include <netinet/icmp6.h>
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# ifndef SOL_IPV6
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# define SOL_IPV6 IPPROTO_IPV6
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# endif
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#endif
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#include "libbb.h"
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#include "inet_common.h"
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#ifndef IPPROTO_ICMP
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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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#define OPT_STRING \
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"FIlnrdvxt:i:m:p:q:s:w:z:f:" \
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IF_FEATURE_TRACEROUTE_SOURCE_ROUTE("g:") \
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"4" IF_TRACEROUTE6("6")
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enum {
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OPT_DONT_FRAGMNT = (1 << 0), /* F */
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OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
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OPT_TTL_FLAG = (1 << 2), /* l */
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OPT_ADDR_NUM = (1 << 3), /* n */
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OPT_BYPASS_ROUTE = (1 << 4), /* r */
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OPT_DEBUG = (1 << 5), /* d */
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OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */
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OPT_IP_CHKSUM = (1 << 7), /* x */
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OPT_TOS = (1 << 8), /* t */
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OPT_DEVICE = (1 << 9), /* i */
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OPT_MAX_TTL = (1 << 10), /* m */
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OPT_PORT = (1 << 11), /* p */
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OPT_NPROBES = (1 << 12), /* q */
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OPT_SOURCE = (1 << 13), /* s */
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OPT_WAITTIME = (1 << 14), /* w */
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OPT_PAUSE_MS = (1 << 15), /* z */
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OPT_FIRST_TTL = (1 << 16), /* f */
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OPT_SOURCE_ROUTE = (1 << 17) * ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE, /* g */
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OPT_IPV4 = (1 << (17+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)), /* 4 */
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OPT_IPV6 = (1 << (18+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)) * ENABLE_TRACEROUTE6, /* 6 */
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};
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#define verbose (option_mask32 & OPT_VERBOSE)
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enum {
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SIZEOF_ICMP_HDR = 8,
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rcvsock = 3, /* receive (icmp) socket file descriptor */
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sndsock = 4, /* send (udp/icmp) socket file descriptor */
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};
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/* Data section of the probe packet */
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struct outdata_t {
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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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};
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#if ENABLE_TRACEROUTE6
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struct outdata6_t {
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uint32_t ident6;
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uint32_t seq6;
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struct timeval tv_UNUSED PACKED; /* time packet left */
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};
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#endif
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struct globals {
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struct ip *outip;
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struct outdata_t *outdata;
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len_and_sockaddr *dest_lsa;
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int packlen; /* total length of packet */
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int pmtu; /* Path MTU Discovery (RFC1191) */
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uint32_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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#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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unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
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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 outdata (G.outdata )
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#define dest_lsa (G.dest_lsa )
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#define packlen (G.packlen )
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#define pmtu (G.pmtu )
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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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#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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# define optlen (G.optlen )
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#endif
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#define recv_pkt (G.recv_pkt )
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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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port = 32768 + 666; \
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waittime = 5; \
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} while (0)
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#define outicmp ((struct icmp *)(outip + 1))
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#define outudp ((struct udphdr *)(outip + 1))
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/* libbb candidate? tftp uses this idiom too */
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static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa)
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{
|
|
len_and_sockaddr *new_lsa = xzalloc(LSA_LEN_SIZE + lsa->len);
|
|
memcpy(new_lsa, lsa, LSA_LEN_SIZE + lsa->len);
|
|
return new_lsa;
|
|
}
|
|
|
|
|
|
static int
|
|
wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to, unsigned *timestamp_us, int *left_ms)
|
|
{
|
|
struct pollfd pfd[1];
|
|
int read_len = 0;
|
|
|
|
pfd[0].fd = rcvsock;
|
|
pfd[0].events = POLLIN;
|
|
if (*left_ms >= 0 && safe_poll(pfd, 1, *left_ms) > 0) {
|
|
unsigned t;
|
|
|
|
read_len = recv_from_to(rcvsock,
|
|
recv_pkt, sizeof(recv_pkt),
|
|
/*flags:*/ MSG_DONTWAIT,
|
|
&from_lsa->u.sa, to, from_lsa->len);
|
|
t = monotonic_us();
|
|
*left_ms -= (t - *timestamp_us) / 1000;
|
|
*timestamp_us = t;
|
|
}
|
|
|
|
return read_len;
|
|
}
|
|
|
|
static void
|
|
send_probe(int seq, int ttl)
|
|
{
|
|
int len, res;
|
|
void *out;
|
|
|
|
/* Payload */
|
|
#if ENABLE_TRACEROUTE6
|
|
if (dest_lsa->u.sa.sa_family == AF_INET6) {
|
|
struct outdata6_t *pkt = (struct outdata6_t *) outip;
|
|
pkt->ident6 = htonl(ident);
|
|
pkt->seq6 = htonl(seq);
|
|
/*gettimeofday(&pkt->tv, &tz);*/
|
|
} else
|
|
#endif
|
|
{
|
|
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 (option_mask32 & OPT_USE_ICMP) {
|
|
outicmp->icmp_seq = htons(seq);
|
|
|
|
/* Always calculate checksum for icmp packets */
|
|
outicmp->icmp_cksum = 0;
|
|
outicmp->icmp_cksum = inet_cksum((uint16_t *)outicmp,
|
|
packlen - (sizeof(*outip) + optlen));
|
|
if (outicmp->icmp_cksum == 0)
|
|
outicmp->icmp_cksum = 0xffff;
|
|
}
|
|
}
|
|
|
|
//BUG! verbose is (x & OPT_VERBOSE), not a counter!
|
|
#if 0 //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 ENABLE_TRACEROUTE6
|
|
if (dest_lsa->u.sa.sa_family == AF_INET6) {
|
|
res = setsockopt(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
|
|
if (res < 0)
|
|
bb_perror_msg_and_die("setsockopt UNICAST_HOPS %d", ttl);
|
|
out = outip;
|
|
len = packlen;
|
|
} else
|
|
#endif
|
|
{
|
|
#if defined IP_TTL
|
|
res = setsockopt(sndsock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
|
|
if (res < 0)
|
|
bb_perror_msg_and_die("setsockopt ttl %d", ttl);
|
|
#endif
|
|
out = outicmp;
|
|
len = packlen - sizeof(*outip);
|
|
if (!(option_mask32 & OPT_USE_ICMP)) {
|
|
out = outdata;
|
|
len -= sizeof(*outudp);
|
|
set_nport(&dest_lsa->u.sa, htons(port + seq));
|
|
}
|
|
}
|
|
|
|
res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len);
|
|
if (res != len)
|
|
bb_info_msg("sent %d octets, ret=%d", len, res);
|
|
}
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
/*
|
|
* Convert an ICMP "type" field to a printable string.
|
|
*/
|
|
static 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 ENABLE_TRACEROUTE6
|
|
static const char *const ttab6[] = {
|
|
[0] "Error", "Dest Unreachable", "Packet Too Big", "Time Exceeded",
|
|
[4] "Param Problem",
|
|
[8] "Echo Request", "Echo Reply", "Membership Query", "Membership Report",
|
|
[12] "Membership Reduction", "Router Solicit", "Router Advert", "Neighbor Solicit",
|
|
[16] "Neighbor Advert", "Redirect",
|
|
};
|
|
|
|
if (dest_lsa->u.sa.sa_family == AF_INET6) {
|
|
if (t < 5)
|
|
return ttab6[t];
|
|
if (t < 128 || t > ND_REDIRECT)
|
|
return "OUT-OF-RANGE";
|
|
return ttab6[(t & 63) + 8];
|
|
}
|
|
# endif
|
|
if (t >= ARRAY_SIZE(ttab))
|
|
return "OUT-OF-RANGE";
|
|
|
|
return ttab[t];
|
|
}
|
|
#endif
|
|
|
|
#if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
#define packet4_ok(read_len, from, seq) \
|
|
packet4_ok(read_len, seq)
|
|
#endif
|
|
static int
|
|
packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
|
|
{
|
|
const struct icmp *icp;
|
|
unsigned char type, code;
|
|
int hlen;
|
|
const struct ip *ip;
|
|
|
|
ip = (struct ip *) recv_pkt;
|
|
hlen = ip->ip_hl << 2;
|
|
if (read_len < hlen + ICMP_MINLEN) {
|
|
#if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
if (verbose)
|
|
printf("packet too short (%d bytes) from %s\n", read_len,
|
|
inet_ntoa(from->sin_addr));
|
|
#endif
|
|
return 0;
|
|
}
|
|
read_len -= hlen;
|
|
icp = (struct icmp *)(recv_pkt + hlen);
|
|
type = icp->icmp_type;
|
|
code = icp->icmp_code;
|
|
/* Path MTU Discovery (RFC1191) */
|
|
pmtu = 0;
|
|
if (code == ICMP_UNREACH_NEEDFRAG)
|
|
pmtu = ntohs(icp->icmp_nextmtu);
|
|
|
|
if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS)
|
|
|| type == ICMP_UNREACH
|
|
|| type == ICMP_ECHOREPLY
|
|
) {
|
|
const struct ip *hip;
|
|
const struct udphdr *up;
|
|
|
|
hip = &icp->icmp_ip;
|
|
hlen = hip->ip_hl << 2;
|
|
if (option_mask32 & OPT_USE_ICMP) {
|
|
struct icmp *hicmp;
|
|
|
|
/* XXX */
|
|
if (type == ICMP_ECHOREPLY
|
|
&& icp->icmp_id == htons(ident)
|
|
&& icp->icmp_seq == htons(seq)
|
|
) {
|
|
return ICMP_UNREACH_PORT+1;
|
|
}
|
|
|
|
hicmp = (struct icmp *)((unsigned char *)hip + hlen);
|
|
if (hlen + SIZEOF_ICMP_HDR <= read_len
|
|
&& hip->ip_p == IPPROTO_ICMP
|
|
&& hicmp->icmp_id == htons(ident)
|
|
&& hicmp->icmp_seq == htons(seq)
|
|
) {
|
|
return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
|
}
|
|
} else {
|
|
up = (struct udphdr *)((char *)hip + hlen);
|
|
if (hlen + 12 <= read_len
|
|
&& hip->ip_p == IPPROTO_UDP
|
|
// Off: since we do not form the entire IP packet,
|
|
// but defer it to kernel, we can't set source port,
|
|
// and thus can't check it here in the reply
|
|
/* && 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",
|
|
read_len, inet_ntoa(from->sin_addr),
|
|
inet_ntoa(ip->ip_dst),
|
|
type, pr_type(type), icp->icmp_code);
|
|
for (i = 4; i < read_len; i += sizeof(*lp))
|
|
printf("%2d: x%8.8x\n", i, *lp++);
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
|
|
#if ENABLE_TRACEROUTE6
|
|
# if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
#define packet_ok(read_len, from_lsa, to, seq) \
|
|
packet_ok(read_len, from_lsa, seq)
|
|
# endif
|
|
static int
|
|
packet_ok(int read_len, len_and_sockaddr *from_lsa,
|
|
struct sockaddr *to,
|
|
int seq)
|
|
{
|
|
const struct icmp6_hdr *icp;
|
|
unsigned char type, code;
|
|
|
|
if (from_lsa->u.sa.sa_family == AF_INET)
|
|
return packet4_ok(read_len, &from_lsa->u.sin, seq);
|
|
|
|
icp = (struct icmp6_hdr *) recv_pkt;
|
|
|
|
type = icp->icmp6_type;
|
|
code = icp->icmp6_code;
|
|
|
|
if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
|
|
|| type == ICMP6_DST_UNREACH
|
|
) {
|
|
struct ip6_hdr *hip;
|
|
struct udphdr *up;
|
|
int nexthdr;
|
|
|
|
hip = (struct ip6_hdr *)(icp + 1);
|
|
up = (struct udphdr *) (hip + 1);
|
|
nexthdr = hip->ip6_nxt;
|
|
|
|
if (nexthdr == IPPROTO_FRAGMENT) {
|
|
nexthdr = *(unsigned char*)up;
|
|
up++;
|
|
}
|
|
if (nexthdr == IPPROTO_UDP) {
|
|
struct outdata6_t *pkt;
|
|
|
|
pkt = (struct outdata6_t *) (up + 1);
|
|
|
|
if (ntohl(pkt->ident6) == ident
|
|
&& ntohl(pkt->seq6) == seq
|
|
) {
|
|
return (type == ICMP6_TIME_EXCEEDED ? -1 : (code<<8)+1);
|
|
}
|
|
}
|
|
}
|
|
|
|
# if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
|
if (verbose) {
|
|
unsigned char *p;
|
|
char pa1[MAXHOSTNAMELEN];
|
|
char pa2[MAXHOSTNAMELEN];
|
|
int i;
|
|
|
|
p = (unsigned char *) (icp + 1);
|
|
|
|
printf("\n%d bytes from %s to "
|
|
"%s: icmp type %d (%s) code %d\n",
|
|
read_len,
|
|
inet_ntop(AF_INET6, &from_lsa->u.sin6.sin6_addr, pa1, sizeof(pa1)),
|
|
inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa2, sizeof(pa2)),
|
|
type, pr_type(type), icp->icmp6_code);
|
|
|
|
read_len -= sizeof(struct icmp6_hdr);
|
|
for (i = 0; i < read_len; i++) {
|
|
if (i % 16 == 0)
|
|
printf("%04x:", i);
|
|
if (i % 4 == 0)
|
|
bb_putchar(' ');
|
|
printf("%02x", p[i]);
|
|
if ((i % 16 == 15) && (i + 1 < read_len))
|
|
bb_putchar('\n');
|
|
}
|
|
bb_putchar('\n');
|
|
}
|
|
# endif
|
|
|
|
return 0;
|
|
}
|
|
#else /* !ENABLE_TRACEROUTE6 */
|
|
static ALWAYS_INLINE int
|
|
packet_ok(int read_len,
|
|
len_and_sockaddr *from_lsa IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM),
|
|
struct sockaddr *to UNUSED_PARAM,
|
|
int seq)
|
|
{
|
|
return packet4_ok(read_len, &from_lsa->u.sin, seq);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Construct an Internet address representation.
|
|
* If the -n flag has been supplied, give
|
|
* numeric value, otherwise try for symbolic name.
|
|
*/
|
|
static void
|
|
print_inetname(const struct sockaddr *from)
|
|
{
|
|
char *ina = xmalloc_sockaddr2dotted_noport(from);
|
|
|
|
if (option_mask32 & OPT_ADDR_NUM) {
|
|
printf(" %s", ina);
|
|
} else {
|
|
char *n = NULL;
|
|
|
|
if (from->sa_family != AF_INET
|
|
|| ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY
|
|
) {
|
|
/* Try to reverse resolve if it is not 0.0.0.0 */
|
|
n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
|
|
}
|
|
printf(" %s (%s)", (n ? n : ina), ina);
|
|
free(n);
|
|
}
|
|
free(ina);
|
|
}
|
|
|
|
static void
|
|
print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
|
|
{
|
|
print_inetname(from);
|
|
|
|
if (verbose) {
|
|
char *ina = xmalloc_sockaddr2dotted_noport(to);
|
|
#if ENABLE_TRACEROUTE6
|
|
if (to->sa_family == AF_INET6) {
|
|
read_len -= sizeof(struct ip6_hdr);
|
|
} else
|
|
#endif
|
|
{
|
|
struct ip *ip4packet = (struct ip*)recv_pkt;
|
|
read_len -= ip4packet->ip_hl << 2;
|
|
}
|
|
printf(" %d bytes to %s", read_len, ina);
|
|
free(ina);
|
|
}
|
|
}
|
|
|
|
static void
|
|
print_delta_ms(unsigned t1p, unsigned t2p)
|
|
{
|
|
unsigned tt = t2p - t1p;
|
|
printf(" %u.%03u ms", tt / 1000, tt % 1000);
|
|
}
|
|
|
|
/*
|
|
* Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
|
|
* [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
|
|
* [-w waittime] [-z pausemsecs] host [packetlen]"
|
|
*/
|
|
static int
|
|
common_traceroute_main(int op, char **argv)
|
|
{
|
|
int minpacket;
|
|
int tos = 0;
|
|
int max_ttl = 30;
|
|
int nprobes = 3;
|
|
int first_ttl = 1;
|
|
unsigned pausemsecs = 0;
|
|
char *source;
|
|
char *device;
|
|
char *tos_str;
|
|
char *max_ttl_str;
|
|
char *port_str;
|
|
char *nprobes_str;
|
|
char *waittime_str;
|
|
char *pausemsecs_str;
|
|
char *first_ttl_str;
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
llist_t *source_route_list = NULL;
|
|
int lsrr = 0;
|
|
#endif
|
|
#if ENABLE_TRACEROUTE6
|
|
sa_family_t af;
|
|
#else
|
|
enum { af = AF_INET };
|
|
#endif
|
|
int ttl;
|
|
int seq;
|
|
len_and_sockaddr *from_lsa;
|
|
struct sockaddr *lastaddr;
|
|
struct sockaddr *to;
|
|
|
|
INIT_G();
|
|
|
|
/* minimum 1 arg */
|
|
opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::");
|
|
op |= getopt32(argv, OPT_STRING
|
|
, &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
|
|
);
|
|
argv += optind;
|
|
|
|
#if 0 /* IGNORED */
|
|
if (op & OPT_IP_CHKSUM)
|
|
bb_error_msg("warning: ip checksums disabled");
|
|
#endif
|
|
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() != 0)
|
|
bb_error_msg_and_die(bb_msg_you_must_be_root);
|
|
}
|
|
if (op & OPT_WAITTIME)
|
|
waittime = xatou_range(waittime_str, 1, 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, max_ttl);
|
|
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
|
if (source_route_list) {
|
|
while (source_route_list) {
|
|
len_and_sockaddr *lsa;
|
|
|
|
if (lsrr >= NGATEWAYS)
|
|
bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
|
|
lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET);
|
|
gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr;
|
|
free(lsa);
|
|
++lsrr;
|
|
}
|
|
optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
|
}
|
|
#endif
|
|
|
|
/* Process destination and optional packet size */
|
|
minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
|
|
if (!(op & OPT_USE_ICMP))
|
|
minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
|
|
#if ENABLE_TRACEROUTE6
|
|
af = AF_UNSPEC;
|
|
if (op & OPT_IPV4)
|
|
af = AF_INET;
|
|
if (op & OPT_IPV6)
|
|
af = AF_INET6;
|
|
dest_lsa = xhost_and_af2sockaddr(argv[0], port, af);
|
|
af = dest_lsa->u.sa.sa_family;
|
|
if (af == AF_INET6)
|
|
minpacket = sizeof(struct outdata6_t);
|
|
#else
|
|
dest_lsa = xhost2sockaddr(argv[0], port);
|
|
#endif
|
|
packlen = minpacket;
|
|
if (argv[1])
|
|
packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
|
|
|
|
/* Ensure the socket fds won't be 0, 1 or 2 */
|
|
bb_sanitize_stdio();
|
|
|
|
#if ENABLE_TRACEROUTE6
|
|
if (af == AF_INET6) {
|
|
xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock);
|
|
# ifdef IPV6_RECVPKTINFO
|
|
setsockopt(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO,
|
|
&const_int_1, sizeof(const_int_1));
|
|
setsockopt(rcvsock, SOL_IPV6, IPV6_2292PKTINFO,
|
|
&const_int_1, sizeof(const_int_1));
|
|
# else
|
|
setsockopt(rcvsock, SOL_IPV6, IPV6_PKTINFO,
|
|
&const_int_1, sizeof(const_int_1));
|
|
# endif
|
|
} else
|
|
#endif
|
|
{
|
|
xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
|
|
}
|
|
|
|
#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));
|
|
|
|
#if ENABLE_TRACEROUTE6
|
|
if (af == AF_INET6) {
|
|
static const int two = 2;
|
|
if (setsockopt(rcvsock, SOL_RAW, IPV6_CHECKSUM, &two, sizeof(two)) < 0)
|
|
bb_perror_msg_and_die("setsockopt RAW_CHECKSUM");
|
|
xmove_fd(xsocket(af, SOCK_DGRAM, 0), sndsock);
|
|
} else
|
|
#endif
|
|
{
|
|
if (op & OPT_USE_ICMP)
|
|
xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
|
|
else
|
|
xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
|
|
#if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS
|
|
if (lsrr > 0) {
|
|
unsigned char optlist[MAX_IPOPTLEN];
|
|
unsigned size;
|
|
|
|
/* final hop */
|
|
gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
|
|
++lsrr;
|
|
|
|
/* force 4 byte alignment */
|
|
optlist[0] = IPOPT_NOP;
|
|
/* loose source route option */
|
|
optlist[1] = IPOPT_LSRR;
|
|
size = lsrr * sizeof(gwlist[0]);
|
|
optlist[2] = size + 3;
|
|
/* pointer to LSRR addresses */
|
|
optlist[3] = IPOPT_MINOFF;
|
|
memcpy(optlist + 4, gwlist, size);
|
|
|
|
if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
|
|
(char *)optlist, size + sizeof(gwlist[0])) < 0) {
|
|
bb_perror_msg_and_die("IP_OPTIONS");
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef SO_SNDBUF
|
|
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
|
|
bb_perror_msg_and_die("SO_SNDBUF");
|
|
}
|
|
#endif
|
|
#ifdef IP_TOS
|
|
if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
|
|
bb_perror_msg_and_die("setsockopt tos %d", tos);
|
|
}
|
|
#endif
|
|
#ifdef IP_DONTFRAG
|
|
if (op & OPT_DONT_FRAGMNT)
|
|
setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG,
|
|
&const_int_1, sizeof(const_int_1));
|
|
#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));
|
|
|
|
outip = xzalloc(packlen);
|
|
|
|
ident = getpid();
|
|
|
|
if (af == AF_INET) {
|
|
if (op & OPT_USE_ICMP) {
|
|
ident |= 0x8000;
|
|
outicmp->icmp_type = ICMP_ECHO;
|
|
outicmp->icmp_id = htons(ident);
|
|
outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
|
|
} else {
|
|
outdata = (struct outdata_t *)(outudp + 1);
|
|
}
|
|
}
|
|
|
|
if (op & OPT_DEVICE) /* hmm, do we need error check? */
|
|
setsockopt_bindtodevice(sndsock, device);
|
|
|
|
if (op & OPT_SOURCE) {
|
|
#if ENABLE_TRACEROUTE6
|
|
// TODO: need xdotted_and_af2sockaddr?
|
|
len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af);
|
|
#else
|
|
len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
|
|
#endif
|
|
/* Ping4 does this (why?) */
|
|
if (af == AF_INET)
|
|
if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
|
|
&source_lsa->u.sa, source_lsa->len))
|
|
bb_error_msg_and_die("can't set multicast source interface");
|
|
//TODO: we can query source port we bound to,
|
|
// and check it in replies... if we care enough
|
|
xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
|
|
free(source_lsa);
|
|
}
|
|
#if ENABLE_TRACEROUTE6
|
|
else if (af == AF_INET6) {
|
|
//TODO: why we don't do it for IPv4?
|
|
len_and_sockaddr *source_lsa;
|
|
|
|
int probe_fd = xsocket(af, SOCK_DGRAM, 0);
|
|
if (op & OPT_DEVICE)
|
|
setsockopt_bindtodevice(probe_fd, device);
|
|
set_nport(&dest_lsa->u.sa, htons(1025));
|
|
/* dummy connect. makes kernel pick source IP (and port) */
|
|
xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len);
|
|
set_nport(&dest_lsa->u.sa, htons(port));
|
|
|
|
/* read IP and port */
|
|
source_lsa = get_sock_lsa(probe_fd);
|
|
if (source_lsa == NULL)
|
|
bb_error_msg_and_die("can't get probe addr");
|
|
|
|
close(probe_fd);
|
|
|
|
/* bind our sockets to this IP (but not port) */
|
|
set_nport(&source_lsa->u.sa, 0);
|
|
xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
|
|
xbind(rcvsock, &source_lsa->u.sa, source_lsa->len);
|
|
|
|
free(source_lsa);
|
|
}
|
|
#endif
|
|
|
|
/* Revert to non-privileged user after opening sockets */
|
|
xsetgid(getgid());
|
|
xsetuid(getuid());
|
|
|
|
printf("traceroute to %s (%s)", argv[0],
|
|
xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa));
|
|
if (op & OPT_SOURCE)
|
|
printf(" from %s", source);
|
|
printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
|
|
|
|
from_lsa = dup_sockaddr(dest_lsa);
|
|
lastaddr = xzalloc(dest_lsa->len);
|
|
to = xzalloc(dest_lsa->len);
|
|
seq = 0;
|
|
for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
|
int probe;
|
|
int unreachable = 0; /* counter */
|
|
int gotlastaddr = 0; /* flags */
|
|
int got_there = 0;
|
|
|
|
printf("%2d", ttl);
|
|
for (probe = 0; probe < nprobes; ++probe) {
|
|
int read_len;
|
|
unsigned t1;
|
|
unsigned t2;
|
|
int left_ms;
|
|
struct ip *ip;
|
|
|
|
fflush_all();
|
|
if (probe != 0 && pausemsecs > 0)
|
|
usleep(pausemsecs * 1000);
|
|
|
|
send_probe(++seq, ttl);
|
|
t2 = t1 = monotonic_us();
|
|
|
|
left_ms = waittime * 1000;
|
|
while ((read_len = wait_for_reply(from_lsa, to, &t2, &left_ms)) != 0) {
|
|
int icmp_code;
|
|
|
|
/* Recv'ed a packet, or read error */
|
|
/* t2 = monotonic_us() - set by wait_for_reply */
|
|
|
|
if (read_len < 0)
|
|
continue;
|
|
icmp_code = packet_ok(read_len, from_lsa, to, seq);
|
|
/* Skip short packet */
|
|
if (icmp_code == 0)
|
|
continue;
|
|
|
|
if (!gotlastaddr
|
|
|| (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0)
|
|
) {
|
|
print(read_len, &from_lsa->u.sa, to);
|
|
memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len);
|
|
gotlastaddr = 1;
|
|
}
|
|
|
|
print_delta_ms(t1, t2);
|
|
ip = (struct ip *)recv_pkt;
|
|
|
|
if (from_lsa->u.sa.sa_family == AF_INET)
|
|
if (op & OPT_TTL_FLAG)
|
|
printf(" (%d)", ip->ip_ttl);
|
|
|
|
/* time exceeded in transit */
|
|
if (icmp_code == -1)
|
|
break;
|
|
icmp_code--;
|
|
switch (icmp_code) {
|
|
#if ENABLE_TRACEROUTE6
|
|
case ICMP6_DST_UNREACH_NOPORT << 8:
|
|
got_there = 1;
|
|
break;
|
|
#endif
|
|
case ICMP_UNREACH_PORT:
|
|
if (ip->ip_ttl <= 1)
|
|
printf(" !");
|
|
got_there = 1;
|
|
break;
|
|
|
|
case ICMP_UNREACH_NET:
|
|
#if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET)
|
|
case ICMP6_DST_UNREACH_NOROUTE << 8:
|
|
#endif
|
|
printf(" !N");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_HOST:
|
|
#if ENABLE_TRACEROUTE6
|
|
case ICMP6_DST_UNREACH_ADDR << 8:
|
|
#endif
|
|
printf(" !H");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_PROTOCOL:
|
|
printf(" !P");
|
|
got_there = 1;
|
|
break;
|
|
case ICMP_UNREACH_NEEDFRAG:
|
|
printf(" !F-%d", pmtu);
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_SRCFAIL:
|
|
#if ENABLE_TRACEROUTE6
|
|
case ICMP6_DST_UNREACH_ADMIN << 8:
|
|
#endif
|
|
printf(" !S");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_FILTER_PROHIB:
|
|
case ICMP_UNREACH_NET_PROHIB: /* misuse */
|
|
printf(" !A");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_HOST_PROHIB:
|
|
printf(" !C");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_HOST_PRECEDENCE:
|
|
printf(" !V");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
|
printf(" !C");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_NET_UNKNOWN:
|
|
case ICMP_UNREACH_HOST_UNKNOWN:
|
|
printf(" !U");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_ISOLATED:
|
|
printf(" !I");
|
|
++unreachable;
|
|
break;
|
|
case ICMP_UNREACH_TOSNET:
|
|
case ICMP_UNREACH_TOSHOST:
|
|
printf(" !T");
|
|
++unreachable;
|
|
break;
|
|
default:
|
|
printf(" !<%d>", icmp_code);
|
|
++unreachable;
|
|
break;
|
|
}
|
|
break;
|
|
} /* while (wait and read a packet) */
|
|
|
|
/* there was no packet at all? */
|
|
if (read_len == 0)
|
|
printf(" *");
|
|
} /* for (nprobes) */
|
|
|
|
bb_putchar('\n');
|
|
if (got_there
|
|
|| (unreachable > 0 && unreachable >= nprobes - 1)
|
|
) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int traceroute_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
return common_traceroute_main(0, argv);
|
|
}
|
|
|
|
#if ENABLE_TRACEROUTE6
|
|
int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
|
int traceroute6_main(int argc UNUSED_PARAM, char **argv)
|
|
{
|
|
return common_traceroute_main(OPT_IPV6, argv);
|
|
}
|
|
#endif
|