1679 lines
42 KiB
C
1679 lines
42 KiB
C
/*
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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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* 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000\n\
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The Regents of the University of California. All rights reserved.\n";
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#if 0
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static const char rcsid[] =
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"@(#)$Id: traceroute.c,v 1.68 2000/12/14 08:04:33 leres Exp $ (LBL)";
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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif
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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 net.inet.ip.ttl hops & can be changed with the -m flag).
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* Three probes (change with -q flag) are sent at each ttl setting and
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* a line is printed showing the ttl, address of the gateway and
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* round trip time of each probe. If the probe answers come from
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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), 64 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), 64 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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#include <sys/param.h>
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#include <sys/file.h>
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#include <sys/ioctl.h>
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#ifdef HAVE_SYS_SELECT_H
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#include <sys/select.h>
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#endif
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#include <sys/socket.h>
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#ifdef HAVE_SYS_SYSCTL_H
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#include <sys/sysctl.h>
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#endif
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#include <sys/time.h>
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#include <netinet/in_systm.h>
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#include <netinet/in.h>
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#include <netinet/ip.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_icmp.h>
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#include <netinet/udp.h>
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#include <netinet/udp_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcpip.h>
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#include <arpa/inet.h>
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#ifdef IPSEC
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#include <net/route.h>
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#include <netinet6/ipsec.h> /* XXX */
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#endif /* IPSEC */
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#ifdef HAVE_MALLOC_H
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#include <malloc.h>
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#endif
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#include <memory.h>
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#include <netdb.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "gnuc.h"
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#ifdef HAVE_OS_PROTO_H
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#include "os-proto.h"
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#endif
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/* rfc1716 */
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#ifndef ICMP_UNREACH_FILTER_PROHIB
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#define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
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#endif
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#ifndef ICMP_UNREACH_HOST_PRECEDENCE
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#define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
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#endif
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#ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
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#define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
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#endif
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#include "findsaddr.h"
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#include "ifaddrlist.h"
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#include "traceroute.h"
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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(u_int32_t)))
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#ifndef MAXHOSTNAMELEN
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#define MAXHOSTNAMELEN 64
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#endif
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#define Fprintf (void)fprintf
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#define Printf (void)printf
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/* What a GRE packet header looks like */
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struct grehdr {
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u_int16_t flags;
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u_int16_t proto;
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u_int16_t length; /* PPTP version of these fields */
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u_int16_t callId;
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};
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#ifndef IPPROTO_GRE
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#define IPPROTO_GRE 47
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#endif
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/* For GRE, we prepare what looks like a PPTP packet */
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#define GRE_PPTP_PROTO 0x880b
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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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u_int32_t *addrs;
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};
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/* Data section of the probe packet */
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struct outdata {
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u_char seq; /* sequence number of this packet */
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u_char ttl; /* ttl packet left with */
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struct timeval tv; /* time packet left */
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};
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#ifndef HAVE_ICMP_NEXTMTU
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/* Path MTU Discovery (RFC1191) */
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struct my_pmtu {
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u_short ipm_void;
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u_short ipm_nextmtu;
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};
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#endif
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u_char packet[512]; /* last inbound (icmp) packet */
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struct ip *outip; /* last output ip packet */
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u_char *outp; /* last output inner protocol packet */
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/* loose source route gateway list (including room for final destination) */
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u_int32_t gwlist[NGATEWAYS + 1];
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int s; /* receive (icmp) socket file descriptor */
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int sndsock; /* send (udp) socket file descriptor */
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struct sockaddr whereto; /* Who to try to reach */
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struct sockaddr wherefrom; /* Who we are */
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int packlen; /* total length of packet */
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int protlen; /* length of protocol part 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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u_int pausemsecs;
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char *prog;
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char *source;
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char *hostname;
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char *device;
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static const char devnull[] = "/dev/null";
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int nprobes = 3;
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int max_ttl;
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int first_ttl = 1;
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u_short ident;
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u_short port; /* protocol specific base "port" */
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int options; /* socket options */
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int verbose;
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int waittime = 5; /* time to wait for response (in seconds) */
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int nflag; /* print addresses numerically */
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#ifdef CANT_HACK_IPCKSUM
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int doipcksum = 0; /* don't calculate ip checksums by default */
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#else
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int doipcksum = 1; /* calculate ip checksums by default */
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#endif
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int optlen; /* length of ip options */
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extern int optind;
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extern int opterr;
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extern char *optarg;
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/* Forwards */
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double deltaT(struct timeval *, struct timeval *);
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void freehostinfo(struct hostinfo *);
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void getaddr(u_int32_t *, char *);
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struct hostinfo *gethostinfo(char *);
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u_short in_cksum(u_short *, int);
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char *inetname(struct in_addr);
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int main(int, char **);
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u_short p_cksum(struct ip *, u_short *, int);
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int packet_ok(u_char *, int, struct sockaddr_in *, int);
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char *pr_type(u_char);
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void print(u_char *, int, struct sockaddr_in *);
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#ifdef IPSEC
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int setpolicy __P((int so, char *policy));
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#endif
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void send_probe(int, int);
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struct outproto *setproto(char *);
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int str2val(const char *, const char *, int, int);
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void tvsub(struct timeval *, struct timeval *);
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void usage(void);
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int wait_for_reply(int, struct sockaddr_in *, const struct timeval *);
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#ifndef HAVE_USLEEP
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int usleep(u_int);
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#endif
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void udp_prep(struct outdata *);
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int udp_check(const u_char *, int);
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void tcp_prep(struct outdata *);
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int tcp_check(const u_char *, int);
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void gre_prep(struct outdata *);
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int gre_check(const u_char *, int);
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void gen_prep(struct outdata *);
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int gen_check(const u_char *, int);
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void icmp_prep(struct outdata *);
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int icmp_check(const u_char *, int);
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/* Descriptor structure for each outgoing protocol we support */
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struct outproto {
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char *name; /* name of protocol */
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u_char num; /* IP protocol number */
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u_short hdrlen; /* max size of protocol header */
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u_short port; /* default base protocol-specific "port" */
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void (*prepare)(struct outdata *);
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/* finish preparing an outgoing packet */
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int (*check)(const u_char *, int);
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/* check an incoming packet */
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};
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/* List of supported protocols. The first one is the default. The last
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one is the handler for generic protocols not explicitly listed. */
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struct outproto protos[] = {
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{
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"udp",
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IPPROTO_UDP,
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sizeof(struct udphdr),
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32768 + 666,
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udp_prep,
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udp_check
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},
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{
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"tcp",
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IPPROTO_TCP,
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sizeof(struct tcphdr),
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32768 + 666,
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tcp_prep,
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tcp_check
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},
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{
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"gre",
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IPPROTO_GRE,
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sizeof(struct grehdr),
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GRE_PPTP_PROTO,
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gre_prep,
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gre_check
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},
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{
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"icmp",
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IPPROTO_ICMP,
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sizeof(struct icmp),
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0,
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icmp_prep,
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icmp_check
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},
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{
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NULL,
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0,
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2 * sizeof(u_short),
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0,
|
|
gen_prep,
|
|
gen_check
|
|
},
|
|
};
|
|
struct outproto *proto = &protos[0];
|
|
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
register int op, code, n;
|
|
register char *cp;
|
|
register const char *err;
|
|
register u_int32_t *ap;
|
|
register struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom;
|
|
register struct sockaddr_in *to = (struct sockaddr_in *)&whereto;
|
|
register struct hostinfo *hi;
|
|
int on = 1;
|
|
register struct protoent *pe;
|
|
register int ttl, probe, i;
|
|
register int seq = 0;
|
|
int tos = 0, settos = 0;
|
|
register int lsrr = 0;
|
|
register u_short off = 0;
|
|
struct ifaddrlist *al;
|
|
char errbuf[132];
|
|
int requestPort = -1;
|
|
int sump = 0;
|
|
int sockerrno;
|
|
|
|
/* Insure the socket fds won't be 0, 1 or 2 */
|
|
if (open(devnull, O_RDONLY) < 0 ||
|
|
open(devnull, O_RDONLY) < 0 ||
|
|
open(devnull, O_RDONLY) < 0) {
|
|
Fprintf(stderr, "%s: open \"%s\": %s\n",
|
|
prog, devnull, strerror(errno));
|
|
exit(1);
|
|
}
|
|
/*
|
|
* Do the setuid-required stuff first, then lose priveleges ASAP.
|
|
* Do error checking for these two calls where they appeared in
|
|
* the original code.
|
|
*/
|
|
cp = "icmp";
|
|
pe = getprotobyname(cp);
|
|
if (pe) {
|
|
if ((s = socket(AF_INET, SOCK_RAW, pe->p_proto)) < 0)
|
|
sockerrno = errno;
|
|
else if ((sndsock = socket(AF_INET, SOCK_RAW, IPPROTO_RAW)) < 0)
|
|
sockerrno = errno;
|
|
}
|
|
|
|
setuid(getuid());
|
|
|
|
#ifdef IPCTL_DEFTTL
|
|
{
|
|
int mib[4] = { CTL_NET, PF_INET, IPPROTO_IP, IPCTL_DEFTTL };
|
|
size_t sz = sizeof(max_ttl);
|
|
|
|
if (sysctl(mib, 4, &max_ttl, &sz, NULL, 0) == -1) {
|
|
perror("sysctl(net.inet.ip.ttl)");
|
|
exit(1);
|
|
}
|
|
}
|
|
#else
|
|
max_ttl = 30;
|
|
#endif
|
|
|
|
if (argv[0] == NULL)
|
|
prog = "traceroute";
|
|
else if ((cp = strrchr(argv[0], '/')) != NULL)
|
|
prog = cp + 1;
|
|
else
|
|
prog = argv[0];
|
|
|
|
opterr = 0;
|
|
while ((op = getopt(argc, argv, "dFInrSvxf:g:i:M:m:P:p:q:s:t:w:z:")) != EOF)
|
|
switch (op) {
|
|
|
|
case 'd':
|
|
options |= SO_DEBUG;
|
|
break;
|
|
|
|
case 'f':
|
|
case 'M': /* FreeBSD compat. */
|
|
first_ttl = str2val(optarg, "first ttl", 1, 255);
|
|
break;
|
|
|
|
case 'F':
|
|
off = IP_DF;
|
|
break;
|
|
|
|
case 'g':
|
|
if (lsrr >= NGATEWAYS) {
|
|
Fprintf(stderr,
|
|
"%s: No more than %d gateways\n",
|
|
prog, NGATEWAYS);
|
|
exit(1);
|
|
}
|
|
getaddr(gwlist + lsrr, optarg);
|
|
++lsrr;
|
|
break;
|
|
|
|
case 'i':
|
|
device = optarg;
|
|
break;
|
|
|
|
case 'I':
|
|
proto = setproto("icmp");
|
|
break;
|
|
|
|
case 'm':
|
|
max_ttl = str2val(optarg, "max ttl", 1, 255);
|
|
break;
|
|
|
|
case 'n':
|
|
++nflag;
|
|
break;
|
|
|
|
case 'P':
|
|
proto = setproto(optarg);
|
|
break;
|
|
|
|
case 'p':
|
|
requestPort = (u_short)str2val(optarg, "port",
|
|
1, (1 << 16) - 1);
|
|
break;
|
|
|
|
case 'q':
|
|
nprobes = str2val(optarg, "nprobes", 1, -1);
|
|
break;
|
|
|
|
case 'r':
|
|
options |= SO_DONTROUTE;
|
|
break;
|
|
|
|
case 's':
|
|
/*
|
|
* set the ip source address of the outbound
|
|
* probe (e.g., on a multi-homed host).
|
|
*/
|
|
source = optarg;
|
|
break;
|
|
|
|
case 'S':
|
|
sump = 1;
|
|
break;
|
|
|
|
case 't':
|
|
tos = str2val(optarg, "tos", 0, 255);
|
|
++settos;
|
|
break;
|
|
|
|
case 'v':
|
|
++verbose;
|
|
break;
|
|
|
|
case 'x':
|
|
doipcksum = (doipcksum == 0);
|
|
break;
|
|
|
|
case 'w':
|
|
waittime = str2val(optarg, "wait time",
|
|
2, 24 * 60 * 60);
|
|
break;
|
|
|
|
case 'z':
|
|
pausemsecs = str2val(optarg, "pause msecs",
|
|
0, 60 * 60 * 1000);
|
|
break;
|
|
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
/* Set requested port, if any, else default for this protocol */
|
|
port = (requestPort != -1) ? requestPort : proto->port;
|
|
|
|
if (first_ttl > max_ttl) {
|
|
Fprintf(stderr,
|
|
"%s: first ttl (%d) may not be greater than max ttl (%d)\n",
|
|
prog, first_ttl, max_ttl);
|
|
exit(1);
|
|
}
|
|
|
|
if (!doipcksum)
|
|
Fprintf(stderr, "%s: Warning: ip checksums disabled\n", prog);
|
|
|
|
if (lsrr > 0)
|
|
optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
|
minpacket = sizeof(*outip) + proto->hdrlen + sizeof(struct outdata) + optlen;
|
|
packlen = minpacket; /* minimum sized packet */
|
|
|
|
/* Process destination and optional packet size */
|
|
switch (argc - optind) {
|
|
|
|
case 2:
|
|
packlen = str2val(argv[optind + 1],
|
|
"packet length", minpacket, maxpacket);
|
|
/* Fall through */
|
|
|
|
case 1:
|
|
hostname = argv[optind];
|
|
hi = gethostinfo(hostname);
|
|
setsin(to, hi->addrs[0]);
|
|
if (hi->n > 1)
|
|
Fprintf(stderr,
|
|
"%s: Warning: %s has multiple addresses; using %s\n",
|
|
prog, hostname, inet_ntoa(to->sin_addr));
|
|
hostname = hi->name;
|
|
hi->name = NULL;
|
|
freehostinfo(hi);
|
|
break;
|
|
|
|
default:
|
|
usage();
|
|
}
|
|
|
|
#ifdef HAVE_SETLINEBUF
|
|
setlinebuf (stdout);
|
|
#else
|
|
setvbuf(stdout, NULL, _IOLBF, 0);
|
|
#endif
|
|
|
|
protlen = packlen - sizeof(*outip) - optlen;
|
|
|
|
outip = (struct ip *)malloc((unsigned)packlen);
|
|
if (outip == NULL) {
|
|
Fprintf(stderr, "%s: malloc: %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
memset((char *)outip, 0, packlen);
|
|
|
|
outip->ip_v = IPVERSION;
|
|
if (settos)
|
|
outip->ip_tos = tos;
|
|
#ifdef BYTESWAP_IP_HDR
|
|
outip->ip_len = htons(packlen);
|
|
outip->ip_off = htons(off);
|
|
#else
|
|
outip->ip_len = packlen;
|
|
outip->ip_off = off;
|
|
#endif
|
|
outip->ip_p = proto->num;
|
|
outp = (u_char *)(outip + 1);
|
|
#ifdef HAVE_RAW_OPTIONS
|
|
if (lsrr > 0) {
|
|
register u_char *optlist;
|
|
|
|
optlist = outp;
|
|
outp += optlen;
|
|
|
|
/* final hop */
|
|
gwlist[lsrr] = to->sin_addr.s_addr;
|
|
|
|
outip->ip_dst.s_addr = gwlist[0];
|
|
|
|
/* 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 + 1, i);
|
|
} else
|
|
#endif
|
|
outip->ip_dst = to->sin_addr;
|
|
|
|
outip->ip_hl = (outp - (u_char *)outip) >> 2;
|
|
ident = (getpid() & 0xffff) | 0x8000;
|
|
|
|
if (pe == NULL) {
|
|
Fprintf(stderr, "%s: unknown protocol %s\n", prog, cp);
|
|
exit(1);
|
|
}
|
|
if (s < 0) {
|
|
errno = sockerrno;
|
|
Fprintf(stderr, "%s: icmp socket: %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
if (options & SO_DEBUG)
|
|
(void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on,
|
|
sizeof(on));
|
|
if (options & SO_DONTROUTE)
|
|
(void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
|
|
sizeof(on));
|
|
|
|
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
|
|
if (setpolicy(s, "in bypass") < 0)
|
|
errx(1, "%s", ipsec_strerror());
|
|
|
|
if (setpolicy(s, "out bypass") < 0)
|
|
errx(1, "%s", ipsec_strerror());
|
|
#endif /* defined(IPSEC) && defined(IPSEC_POLICY_IPSEC) */
|
|
|
|
if (sndsock < 0) {
|
|
errno = sockerrno;
|
|
Fprintf(stderr, "%s: raw socket: %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
|
|
#if defined(IP_OPTIONS) && !defined(HAVE_RAW_OPTIONS)
|
|
if (lsrr > 0) {
|
|
u_char optlist[MAX_IPOPTLEN];
|
|
|
|
cp = "ip";
|
|
if ((pe = getprotobyname(cp)) == NULL) {
|
|
Fprintf(stderr, "%s: unknown protocol %s\n", prog, cp);
|
|
exit(1);
|
|
}
|
|
|
|
/* 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, pe->p_proto, IP_OPTIONS,
|
|
(char *)optlist, i + sizeof(gwlist[0]))) < 0) {
|
|
Fprintf(stderr, "%s: IP_OPTIONS: %s\n",
|
|
prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef SO_SNDBUF
|
|
if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen,
|
|
sizeof(packlen)) < 0) {
|
|
Fprintf(stderr, "%s: SO_SNDBUF: %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif
|
|
#ifdef IP_HDRINCL
|
|
if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
|
|
sizeof(on)) < 0) {
|
|
Fprintf(stderr, "%s: IP_HDRINCL: %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#else
|
|
#ifdef IP_TOS
|
|
if (settos && setsockopt(sndsock, IPPROTO_IP, IP_TOS,
|
|
(char *)&tos, sizeof(tos)) < 0) {
|
|
Fprintf(stderr, "%s: setsockopt tos %d: %s\n",
|
|
prog, tos, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif
|
|
#endif
|
|
if (options & SO_DEBUG)
|
|
(void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on,
|
|
sizeof(on));
|
|
if (options & SO_DONTROUTE)
|
|
(void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
|
|
sizeof(on));
|
|
|
|
/* Get the interface address list */
|
|
n = ifaddrlist(&al, errbuf);
|
|
if (n < 0) {
|
|
Fprintf(stderr, "%s: ifaddrlist: %s\n", prog, errbuf);
|
|
exit(1);
|
|
}
|
|
if (n == 0) {
|
|
Fprintf(stderr,
|
|
"%s: Can't find any network interfaces\n", prog);
|
|
exit(1);
|
|
}
|
|
|
|
/* Look for a specific device */
|
|
if (device != NULL) {
|
|
for (i = n; i > 0; --i, ++al)
|
|
if (strcmp(device, al->device) == 0)
|
|
break;
|
|
if (i <= 0) {
|
|
Fprintf(stderr, "%s: Can't find interface %.32s\n",
|
|
prog, device);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* Determine our source address */
|
|
if (source == NULL) {
|
|
/*
|
|
* If a device was specified, use the interface address.
|
|
* Otherwise, try to determine our source address.
|
|
*/
|
|
if (device != NULL)
|
|
setsin(from, al->addr);
|
|
else if ((err = findsaddr(to, from)) != NULL) {
|
|
Fprintf(stderr, "%s: findsaddr: %s\n",
|
|
prog, err);
|
|
exit(1);
|
|
}
|
|
} 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 (device != NULL) {
|
|
for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
|
|
if (*ap == al->addr)
|
|
break;
|
|
if (i <= 0) {
|
|
Fprintf(stderr,
|
|
"%s: %s is not on interface %.32s\n",
|
|
prog, source, device);
|
|
exit(1);
|
|
}
|
|
setsin(from, *ap);
|
|
} else {
|
|
setsin(from, hi->addrs[0]);
|
|
if (hi->n > 1)
|
|
Fprintf(stderr,
|
|
"%s: Warning: %s has multiple addresses; using %s\n",
|
|
prog, source, inet_ntoa(from->sin_addr));
|
|
}
|
|
freehostinfo(hi);
|
|
}
|
|
|
|
outip->ip_src = from->sin_addr;
|
|
|
|
/* Check the source address (-s), if any, is valid */
|
|
if (bind(sndsock, (struct sockaddr *)from, sizeof(*from)) < 0) {
|
|
Fprintf(stderr, "%s: bind: %s\n",
|
|
prog, strerror(errno));
|
|
exit (1);
|
|
}
|
|
|
|
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
|
|
if (setpolicy(sndsock, "in bypass") < 0)
|
|
errx(1, "%s", ipsec_strerror());
|
|
|
|
if (setpolicy(sndsock, "out bypass") < 0)
|
|
errx(1, "%s", ipsec_strerror());
|
|
#endif /* defined(IPSEC) && defined(IPSEC_POLICY_IPSEC) */
|
|
|
|
Fprintf(stderr, "%s to %s (%s)",
|
|
prog, hostname, inet_ntoa(to->sin_addr));
|
|
if (source)
|
|
Fprintf(stderr, " from %s", source);
|
|
Fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen);
|
|
(void)fflush(stderr);
|
|
|
|
for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
|
u_int32_t lastaddr = 0;
|
|
int gotlastaddr = 0;
|
|
int got_there = 0;
|
|
int unreachable = 0;
|
|
int sentfirst = 0;
|
|
int loss;
|
|
|
|
Printf("%2d ", ttl);
|
|
for (probe = 0, loss = 0; probe < nprobes; ++probe) {
|
|
register int cc;
|
|
struct timeval t1, t2;
|
|
struct timezone tz;
|
|
register struct ip *ip;
|
|
struct outdata outdata;
|
|
|
|
if (sentfirst && pausemsecs > 0)
|
|
usleep(pausemsecs * 1000);
|
|
/* Prepare outgoing data */
|
|
outdata.seq = ++seq;
|
|
outdata.ttl = ttl;
|
|
|
|
/* Avoid alignment problems by copying bytewise: */
|
|
(void)gettimeofday(&t1, &tz);
|
|
memcpy(&outdata.tv, &t1, sizeof(outdata.tv));
|
|
|
|
/* Finalize and send packet */
|
|
(*proto->prepare)(&outdata);
|
|
send_probe(seq, ttl);
|
|
++sentfirst;
|
|
|
|
/* Wait for a reply */
|
|
while ((cc = wait_for_reply(s, from, &t1)) != 0) {
|
|
double T;
|
|
int precis;
|
|
|
|
(void)gettimeofday(&t2, &tz);
|
|
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;
|
|
}
|
|
T = deltaT(&t1, &t2);
|
|
#ifdef SANE_PRECISION
|
|
if (T >= 1000.0)
|
|
precis = 0;
|
|
else if (T >= 100.0)
|
|
precis = 1;
|
|
else if (T >= 10.0)
|
|
precis = 2;
|
|
else
|
|
#endif
|
|
precis = 3;
|
|
Printf(" %.*f ms", precis, T);
|
|
if (i == -2) {
|
|
#ifndef ARCHAIC
|
|
ip = (struct ip *)packet;
|
|
if (ip->ip_ttl <= 1)
|
|
Printf(" !");
|
|
#endif
|
|
++got_there;
|
|
break;
|
|
}
|
|
/* time exceeded in transit */
|
|
if (i == -1)
|
|
break;
|
|
code = i - 1;
|
|
switch (code) {
|
|
|
|
case ICMP_UNREACH_PORT:
|
|
#ifndef ARCHAIC
|
|
ip = (struct ip *)packet;
|
|
if (ip->ip_ttl <= 1)
|
|
Printf(" !");
|
|
#endif
|
|
++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:
|
|
++unreachable;
|
|
Printf(" !X");
|
|
break;
|
|
|
|
case ICMP_UNREACH_HOST_PRECEDENCE:
|
|
++unreachable;
|
|
Printf(" !V");
|
|
break;
|
|
|
|
case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
|
++unreachable;
|
|
Printf(" !C");
|
|
break;
|
|
|
|
default:
|
|
++unreachable;
|
|
Printf(" !<%d>", code);
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
if (cc == 0) {
|
|
loss++;
|
|
Printf(" *");
|
|
}
|
|
(void)fflush(stdout);
|
|
}
|
|
if (sump) {
|
|
Printf(" (%d%% loss)", (loss * 100) / nprobes);
|
|
}
|
|
putchar('\n');
|
|
if (got_there ||
|
|
(unreachable > 0 && unreachable >= nprobes - 1))
|
|
break;
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
int
|
|
wait_for_reply(register int sock, register struct sockaddr_in *fromp,
|
|
register const struct timeval *tp)
|
|
{
|
|
fd_set *fdsp;
|
|
size_t nfds;
|
|
struct timeval now, wait;
|
|
struct timezone tz;
|
|
register int cc = 0;
|
|
register int error;
|
|
int fromlen = sizeof(*fromp);
|
|
|
|
nfds = howmany(sock + 1, NFDBITS);
|
|
if ((fdsp = malloc(nfds * sizeof(fd_mask))) == NULL)
|
|
err(1, "malloc");
|
|
memset(fdsp, 0, nfds * sizeof(fd_mask));
|
|
FD_SET(sock, fdsp);
|
|
|
|
wait.tv_sec = tp->tv_sec + waittime;
|
|
wait.tv_usec = tp->tv_usec;
|
|
(void)gettimeofday(&now, &tz);
|
|
tvsub(&wait, &now);
|
|
if (wait.tv_sec < 0) {
|
|
wait.tv_sec = 0;
|
|
wait.tv_usec = 1;
|
|
}
|
|
|
|
error = select(sock + 1, fdsp, NULL, NULL, &wait);
|
|
if (error == -1 && errno == EINVAL) {
|
|
Fprintf(stderr, "%s: botched select() args\n", prog);
|
|
exit(1);
|
|
}
|
|
if (error > 0)
|
|
cc = recvfrom(sock, (char *)packet, sizeof(packet), 0,
|
|
(struct sockaddr *)fromp, &fromlen);
|
|
|
|
free(fdsp);
|
|
return(cc);
|
|
}
|
|
|
|
void
|
|
send_probe(int seq, int ttl)
|
|
{
|
|
register int cc;
|
|
|
|
outip->ip_ttl = ttl;
|
|
outip->ip_id = htons(ident + seq);
|
|
|
|
/* XXX undocumented debugging hack */
|
|
if (verbose > 1) {
|
|
register const u_short *sp;
|
|
register int nshorts, i;
|
|
|
|
sp = (u_short *)outip;
|
|
nshorts = (u_int)packlen / sizeof(u_short);
|
|
i = 0;
|
|
Printf("[ %d bytes", packlen);
|
|
while (--nshorts >= 0) {
|
|
if ((i++ % 8) == 0)
|
|
Printf("\n\t");
|
|
Printf(" %04x", ntohs(*sp++));
|
|
}
|
|
if (packlen & 1) {
|
|
if ((i % 8) == 0)
|
|
Printf("\n\t");
|
|
Printf(" %02x", *(u_char *)sp);
|
|
}
|
|
Printf("]\n");
|
|
}
|
|
|
|
#if !defined(IP_HDRINCL) && defined(IP_TTL)
|
|
if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
|
|
(char *)&ttl, sizeof(ttl)) < 0) {
|
|
Fprintf(stderr, "%s: setsockopt ttl %d: %s\n",
|
|
prog, ttl, strerror(errno));
|
|
exit(1);
|
|
}
|
|
#endif
|
|
|
|
cc = sendto(sndsock, (char *)outip,
|
|
packlen, 0, &whereto, sizeof(whereto));
|
|
if (cc < 0 || cc != packlen) {
|
|
if (cc < 0)
|
|
Fprintf(stderr, "%s: sendto: %s\n",
|
|
prog, strerror(errno));
|
|
Printf("%s: wrote %s %d chars, ret=%d\n",
|
|
prog, hostname, packlen, cc);
|
|
(void)fflush(stdout);
|
|
}
|
|
}
|
|
|
|
#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
|
|
int
|
|
setpolicy(so, policy)
|
|
int so;
|
|
char *policy;
|
|
{
|
|
char *buf;
|
|
|
|
buf = ipsec_set_policy(policy, strlen(policy));
|
|
if (buf == NULL) {
|
|
warnx("%s", ipsec_strerror());
|
|
return -1;
|
|
}
|
|
(void)setsockopt(so, IPPROTO_IP, IP_IPSEC_POLICY,
|
|
buf, ipsec_get_policylen(buf));
|
|
|
|
free(buf);
|
|
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
double
|
|
deltaT(struct timeval *t1p, struct timeval *t2p)
|
|
{
|
|
register double dt;
|
|
|
|
dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
|
|
(double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
|
|
return (dt);
|
|
}
|
|
|
|
/*
|
|
* Convert an ICMP "type" field to a printable string.
|
|
*/
|
|
char *
|
|
pr_type(register u_char t)
|
|
{
|
|
static char *ttab[] = {
|
|
"Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
|
|
"Source Quench", "Redirect", "ICMP 6", "ICMP 7",
|
|
"Echo", "ICMP 9", "ICMP 10", "Time Exceeded",
|
|
"Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
|
|
"Info Reply"
|
|
};
|
|
|
|
if (t > 16)
|
|
return("OUT-OF-RANGE");
|
|
|
|
return(ttab[t]);
|
|
}
|
|
|
|
int
|
|
packet_ok(register u_char *buf, int cc, register struct sockaddr_in *from,
|
|
register int seq)
|
|
{
|
|
register struct icmp *icp;
|
|
register u_char type, code;
|
|
register int hlen;
|
|
#ifndef ARCHAIC
|
|
register struct ip *ip;
|
|
|
|
ip = (struct ip *) buf;
|
|
hlen = ip->ip_hl << 2;
|
|
if (cc < hlen + ICMP_MINLEN) {
|
|
if (verbose)
|
|
Printf("packet too short (%d bytes) from %s\n", cc,
|
|
inet_ntoa(from->sin_addr));
|
|
return (0);
|
|
}
|
|
cc -= hlen;
|
|
icp = (struct icmp *)(buf + hlen);
|
|
#else
|
|
icp = (struct icmp *)buf;
|
|
#endif
|
|
type = icp->icmp_type;
|
|
code = icp->icmp_code;
|
|
/* Path MTU Discovery (RFC1191) */
|
|
if (code != ICMP_UNREACH_NEEDFRAG)
|
|
pmtu = 0;
|
|
else {
|
|
#ifdef HAVE_ICMP_NEXTMTU
|
|
pmtu = ntohs(icp->icmp_nextmtu);
|
|
#else
|
|
pmtu = ntohs(((struct my_pmtu *)&icp->icmp_void)->ipm_nextmtu);
|
|
#endif
|
|
}
|
|
if (type == ICMP_ECHOREPLY
|
|
&& proto->num == IPPROTO_ICMP
|
|
&& (*proto->check)((u_char *)icp, (u_char)seq))
|
|
return -2;
|
|
if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
|
|
type == ICMP_UNREACH) {
|
|
struct ip *hip;
|
|
u_char *inner;
|
|
|
|
hip = &icp->icmp_ip;
|
|
hlen = hip->ip_hl << 2;
|
|
inner = (u_char *)((u_char *)hip + hlen);
|
|
if (hlen + 12 <= cc
|
|
&& hip->ip_p == proto->num
|
|
&& (*proto->check)(inner, (u_char)seq))
|
|
return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
|
}
|
|
#ifndef ARCHAIC
|
|
if (verbose) {
|
|
register int i;
|
|
u_int32_t *lp = (u_int32_t *)&icp->icmp_ip;
|
|
|
|
Printf("\n%d bytes from %s to ", cc, inet_ntoa(from->sin_addr));
|
|
Printf("%s: icmp type %d (%s) code %d\n",
|
|
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);
|
|
}
|
|
|
|
void
|
|
icmp_prep(struct outdata *outdata)
|
|
{
|
|
struct icmp *const icmpheader = (struct icmp *) outp;
|
|
|
|
icmpheader->icmp_type = ICMP_ECHO;
|
|
icmpheader->icmp_id = htons(ident);
|
|
icmpheader->icmp_seq = htons(outdata->seq);
|
|
icmpheader->icmp_cksum = 0;
|
|
icmpheader->icmp_cksum = in_cksum((u_short *)icmpheader, protlen);
|
|
if (icmpheader->icmp_cksum == 0)
|
|
icmpheader->icmp_cksum = 0xffff;
|
|
}
|
|
|
|
int
|
|
icmp_check(const u_char *data, int seq)
|
|
{
|
|
struct icmp *const icmpheader = (struct icmp *) data;
|
|
|
|
return (icmpheader->icmp_id == htons(ident)
|
|
&& icmpheader->icmp_seq == htons(seq));
|
|
}
|
|
|
|
void
|
|
udp_prep(struct outdata *outdata)
|
|
{
|
|
struct udphdr *const outudp = (struct udphdr *) outp;
|
|
|
|
outudp->uh_sport = htons(ident);
|
|
outudp->uh_dport = htons(port + outdata->seq);
|
|
outudp->uh_ulen = htons((u_short)protlen);
|
|
outudp->uh_sum = 0;
|
|
if (doipcksum) {
|
|
u_short sum = p_cksum(outip, (u_short*)outudp, protlen);
|
|
outudp->uh_sum = (sum) ? sum : 0xffff;
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
int
|
|
udp_check(const u_char *data, int seq)
|
|
{
|
|
struct udphdr *const udp = (struct udphdr *) data;
|
|
|
|
return (ntohs(udp->uh_sport) == ident
|
|
&& ntohs(udp->uh_dport) == port + seq);
|
|
}
|
|
|
|
void
|
|
tcp_prep(struct outdata *outdata)
|
|
{
|
|
struct tcphdr *const tcp = (struct tcphdr *) outp;
|
|
|
|
tcp->th_sport = htons(ident);
|
|
tcp->th_dport = htons(port + outdata->seq);
|
|
tcp->th_seq = (tcp->th_sport << 16) | tcp->th_dport;
|
|
tcp->th_ack = 0;
|
|
tcp->th_off = 5;
|
|
tcp->th_flags = TH_SYN;
|
|
tcp->th_sum = 0;
|
|
|
|
if (doipcksum) {
|
|
u_short sum = p_cksum(outip, (u_short*)tcp, protlen);
|
|
tcp->th_sum = (sum) ? sum : 0xffff;
|
|
}
|
|
}
|
|
|
|
int
|
|
tcp_check(const u_char *data, int seq)
|
|
{
|
|
struct tcphdr *const tcp = (struct tcphdr *) data;
|
|
|
|
return (ntohs(tcp->th_sport) == ident
|
|
&& ntohs(tcp->th_dport) == port + seq);
|
|
}
|
|
|
|
void
|
|
gre_prep(struct outdata *outdata)
|
|
{
|
|
struct grehdr *const gre = (struct grehdr *) outp;
|
|
|
|
gre->flags = htons(0x2001);
|
|
gre->proto = htons(port);
|
|
gre->length = 0;
|
|
gre->callId = htons(ident + outdata->seq);
|
|
}
|
|
|
|
int
|
|
gre_check(const u_char *data, int seq)
|
|
{
|
|
struct grehdr *const gre = (struct grehdr *) data;
|
|
|
|
return(ntohs(gre->proto) == port
|
|
&& ntohs(gre->callId) == ident + seq);
|
|
}
|
|
|
|
void
|
|
gen_prep(struct outdata *outdata)
|
|
{
|
|
u_int16_t *const ptr = (u_int16_t *) outp;
|
|
|
|
ptr[0] = htons(ident);
|
|
ptr[1] = htons(port + outdata->seq);
|
|
}
|
|
|
|
int
|
|
gen_check(const u_char *data, int seq)
|
|
{
|
|
u_int16_t *const ptr = (u_int16_t *) data;
|
|
|
|
return(ntohs(ptr[0]) == ident
|
|
&& ntohs(ptr[1]) == port + seq);
|
|
}
|
|
|
|
void
|
|
print(register u_char *buf, register int cc, register struct sockaddr_in *from)
|
|
{
|
|
register struct ip *ip;
|
|
register int hlen;
|
|
|
|
ip = (struct ip *) buf;
|
|
hlen = ip->ip_hl << 2;
|
|
cc -= hlen;
|
|
|
|
if (nflag)
|
|
Printf(" %s", inet_ntoa(from->sin_addr));
|
|
else
|
|
Printf(" %s (%s)", inetname(from->sin_addr),
|
|
inet_ntoa(from->sin_addr));
|
|
|
|
if (verbose)
|
|
Printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
|
|
}
|
|
|
|
/*
|
|
* Checksum routine for UDP and TCP headers.
|
|
*/
|
|
u_short
|
|
p_cksum(struct ip *ip, u_short *data, int len)
|
|
{
|
|
static struct ipovly ipo;
|
|
u_short sumh, sumd;
|
|
u_long sumt;
|
|
|
|
ipo.ih_pr = ip->ip_p;
|
|
ipo.ih_len = htons(len);
|
|
ipo.ih_src = ip->ip_src;
|
|
ipo.ih_dst = ip->ip_dst;
|
|
|
|
sumh = in_cksum((u_short*)&ipo, sizeof(ipo)); /* pseudo ip hdr cksum */
|
|
sumd = in_cksum((u_short*)data, len); /* payload data cksum */
|
|
sumt = (sumh << 16) | (sumd);
|
|
|
|
return ~in_cksum((u_short*)&sumt, sizeof(sumt));
|
|
}
|
|
|
|
/*
|
|
* Checksum routine for Internet Protocol family headers (C Version)
|
|
*/
|
|
u_short
|
|
in_cksum(register u_short *addr, register int len)
|
|
{
|
|
register int nleft = len;
|
|
register u_short *w = addr;
|
|
register u_short answer;
|
|
register 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 += *(u_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);
|
|
}
|
|
|
|
/*
|
|
* Subtract 2 timeval structs: out = out - in.
|
|
* Out is assumed to be within about LONG_MAX seconds of in.
|
|
*/
|
|
void
|
|
tvsub(register struct timeval *out, register struct timeval *in)
|
|
{
|
|
|
|
if ((out->tv_usec -= in->tv_usec) < 0) {
|
|
--out->tv_sec;
|
|
out->tv_usec += 1000000;
|
|
}
|
|
out->tv_sec -= in->tv_sec;
|
|
}
|
|
|
|
/*
|
|
* Construct an Internet address representation.
|
|
* If the nflag has been supplied, give
|
|
* numeric value, otherwise try for symbolic name.
|
|
*/
|
|
char *
|
|
inetname(struct in_addr in)
|
|
{
|
|
register char *cp;
|
|
register struct hostent *hp;
|
|
static int first = 1;
|
|
static char domain[MAXHOSTNAMELEN + 1], line[MAXHOSTNAMELEN + 1];
|
|
|
|
if (first && !nflag) {
|
|
first = 0;
|
|
if (gethostname(domain, sizeof(domain) - 1) < 0)
|
|
domain[0] = '\0';
|
|
else {
|
|
cp = strchr(domain, '.');
|
|
if (cp == NULL) {
|
|
hp = gethostbyname(domain);
|
|
if (hp != NULL)
|
|
cp = strchr(hp->h_name, '.');
|
|
}
|
|
if (cp == NULL)
|
|
domain[0] = '\0';
|
|
else {
|
|
++cp;
|
|
(void)strncpy(domain, cp, sizeof(domain) - 1);
|
|
domain[sizeof(domain) - 1] = '\0';
|
|
}
|
|
}
|
|
}
|
|
if (!nflag && in.s_addr != INADDR_ANY) {
|
|
hp = gethostbyaddr((char *)&in, sizeof(in), AF_INET);
|
|
if (hp != NULL) {
|
|
if ((cp = strchr(hp->h_name, '.')) != NULL &&
|
|
strcmp(cp + 1, domain) == 0)
|
|
*cp = '\0';
|
|
(void)strncpy(line, hp->h_name, sizeof(line) - 1);
|
|
line[sizeof(line) - 1] = '\0';
|
|
return (line);
|
|
}
|
|
}
|
|
return (inet_ntoa(in));
|
|
}
|
|
|
|
struct hostinfo *
|
|
gethostinfo(register char *hostname)
|
|
{
|
|
register int n;
|
|
register struct hostent *hp;
|
|
register struct hostinfo *hi;
|
|
register char **p;
|
|
register u_int32_t addr, *ap;
|
|
|
|
if (strlen(hostname) > 64) {
|
|
Fprintf(stderr, "%s: hostname \"%.32s...\" is too long\n",
|
|
prog, hostname);
|
|
exit(1);
|
|
}
|
|
hi = calloc(1, sizeof(*hi));
|
|
if (hi == NULL) {
|
|
Fprintf(stderr, "%s: calloc %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
addr = inet_addr(hostname);
|
|
if ((int32_t)addr != -1) {
|
|
hi->name = strdup(hostname);
|
|
hi->n = 1;
|
|
hi->addrs = calloc(1, sizeof(hi->addrs[0]));
|
|
if (hi->addrs == NULL) {
|
|
Fprintf(stderr, "%s: calloc %s\n",
|
|
prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
hi->addrs[0] = addr;
|
|
return (hi);
|
|
}
|
|
|
|
hp = gethostbyname(hostname);
|
|
if (hp == NULL) {
|
|
Fprintf(stderr, "%s: unknown host %s\n", prog, hostname);
|
|
exit(1);
|
|
}
|
|
if (hp->h_addrtype != AF_INET || hp->h_length != 4) {
|
|
Fprintf(stderr, "%s: bad host %s\n", prog, hostname);
|
|
exit(1);
|
|
}
|
|
hi->name = strdup(hp->h_name);
|
|
for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
|
|
continue;
|
|
hi->n = n;
|
|
hi->addrs = calloc(n, sizeof(hi->addrs[0]));
|
|
if (hi->addrs == NULL) {
|
|
Fprintf(stderr, "%s: calloc %s\n", prog, strerror(errno));
|
|
exit(1);
|
|
}
|
|
for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
|
|
memcpy(ap, *p, sizeof(*ap));
|
|
return (hi);
|
|
}
|
|
|
|
void
|
|
freehostinfo(register struct hostinfo *hi)
|
|
{
|
|
if (hi->name != NULL) {
|
|
free(hi->name);
|
|
hi->name = NULL;
|
|
}
|
|
free((char *)hi->addrs);
|
|
free((char *)hi);
|
|
}
|
|
|
|
void
|
|
getaddr(register u_int32_t *ap, register char *hostname)
|
|
{
|
|
register struct hostinfo *hi;
|
|
|
|
hi = gethostinfo(hostname);
|
|
*ap = hi->addrs[0];
|
|
freehostinfo(hi);
|
|
}
|
|
|
|
void
|
|
setsin(register struct sockaddr_in *sin, register u_int32_t addr)
|
|
{
|
|
|
|
memset(sin, 0, sizeof(*sin));
|
|
#ifdef HAVE_SOCKADDR_SA_LEN
|
|
sin->sin_len = sizeof(*sin);
|
|
#endif
|
|
sin->sin_family = AF_INET;
|
|
sin->sin_addr.s_addr = addr;
|
|
}
|
|
|
|
/* String to value with optional min and max. Handles decimal and hex. */
|
|
int
|
|
str2val(register const char *str, register const char *what,
|
|
register int mi, register int ma)
|
|
{
|
|
register const char *cp;
|
|
register int val;
|
|
char *ep;
|
|
|
|
if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
|
|
cp = str + 2;
|
|
val = (int)strtol(cp, &ep, 16);
|
|
} else
|
|
val = (int)strtol(str, &ep, 10);
|
|
if (*ep != '\0') {
|
|
Fprintf(stderr, "%s: \"%s\" bad value for %s \n",
|
|
prog, str, what);
|
|
exit(1);
|
|
}
|
|
if (val < mi && mi >= 0) {
|
|
if (mi == 0)
|
|
Fprintf(stderr, "%s: %s must be >= %d\n",
|
|
prog, what, mi);
|
|
else
|
|
Fprintf(stderr, "%s: %s must be > %d\n",
|
|
prog, what, mi - 1);
|
|
exit(1);
|
|
}
|
|
if (val > ma && ma >= 0) {
|
|
Fprintf(stderr, "%s: %s must be <= %d\n", prog, what, ma);
|
|
exit(1);
|
|
}
|
|
return (val);
|
|
}
|
|
|
|
struct outproto *
|
|
setproto(char *pname)
|
|
{
|
|
struct outproto *proto;
|
|
int i;
|
|
|
|
for (i = 0; protos[i].name != NULL; i++) {
|
|
if (strcasecmp(protos[i].name, pname) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
proto = &protos[i];
|
|
if (proto->name == NULL) { /* generic handler */
|
|
struct protoent *pe;
|
|
u_long pnum;
|
|
|
|
/* Determine the IP protocol number */
|
|
if ((pe = getprotobyname(pname)) != NULL)
|
|
pnum = pe->p_proto;
|
|
else
|
|
pnum = str2val(optarg, "proto number", 1, 255);
|
|
proto->num = pnum;
|
|
}
|
|
return proto;
|
|
}
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
extern char version[];
|
|
|
|
Fprintf(stderr, "Version %s\n", version);
|
|
Fprintf(stderr,
|
|
"Usage: %s [-dFInrSvx] [-g gateway] [-i iface] [-f first_ttl]\n"
|
|
"\t[-m max_ttl] [-p port] [-P proto] [-q nqueries] [-s src_addr]\n"
|
|
"\t[-t tos] [-w waittime] [-z pausemsecs] host [packetlen]\n", prog);
|
|
exit(1);
|
|
}
|