[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Copyright (c) 1988, 1989, 1991, 1994, 1995, 1996, 1997, 1998, 1999, 2000
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| 4 | * The Regents of the University of California. All rights reserved.
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| 5 | *
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| 6 | * Busybox port by Vladimir Oleynik (C) 2005 <dzo@simtreas.ru>
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| 7 | *
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| 8 | * Redistribution and use in source and binary forms, with or without
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| 9 | * modification, are permitted provided that: (1) source code distributions
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| 10 | * retain the above copyright notice and this paragraph in its entirety, (2)
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| 11 | * distributions including binary code include the above copyright notice and
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| 12 | * this paragraph in its entirety in the documentation or other materials
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| 13 | * provided with the distribution, and (3) all advertising materials mentioning
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| 14 | * features or use of this software display the following acknowledgement:
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| 15 | * ``This product includes software developed by the University of California,
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| 16 | * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
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| 17 | * the University nor the names of its contributors may be used to endorse
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| 18 | * or promote products derived from this software without specific prior
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| 19 | * written permission.
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| 20 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
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| 21 | * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
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| 22 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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| 23 | */
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| 24 |
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| 25 | //#define version "1.4a12"
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| 26 |
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| 27 |
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| 28 | /*
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| 29 | * traceroute host - trace the route ip packets follow going to "host".
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| 30 | *
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| 31 | * Attempt to trace the route an ip packet would follow to some
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| 32 | * internet host. We find out intermediate hops by launching probe
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| 33 | * packets with a small ttl (time to live) then listening for an
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| 34 | * icmp "time exceeded" reply from a gateway. We start our probes
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| 35 | * with a ttl of one and increase by one until we get an icmp "port
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| 36 | * unreachable" (which means we got to "host") or hit a max (which
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| 37 | * defaults to 30 hops & can be changed with the -m flag). Three
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| 38 | * probes (change with -q flag) are sent at each ttl setting and a
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| 39 | * line is printed showing the ttl, address of the gateway and
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| 40 | * round trip time of each probe. If the probe answers come from
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| 41 | * different gateways, the address of each responding system will
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| 42 | * be printed. If there is no response within a 5 sec. timeout
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| 43 | * interval (changed with the -w flag), a "*" is printed for that
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| 44 | * probe.
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| 45 | *
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| 46 | * Probe packets are UDP format. We don't want the destination
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| 47 | * host to process them so the destination port is set to an
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| 48 | * unlikely value (if some clod on the destination is using that
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| 49 | * value, it can be changed with the -p flag).
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| 50 | *
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| 51 | * A sample use might be:
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| 52 | *
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| 53 | * [yak 71]% traceroute nis.nsf.net.
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| 54 | * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
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| 55 | * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
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| 56 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
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| 57 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
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| 58 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
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| 59 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
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| 60 | * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
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| 61 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
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| 62 | * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
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| 63 | * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
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| 64 | * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
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| 65 | * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
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| 66 | *
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| 67 | * Note that lines 2 & 3 are the same. This is due to a buggy
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| 68 | * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
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| 69 | * packets with a zero ttl.
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| 70 | *
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| 71 | * A more interesting example is:
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| 72 | *
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| 73 | * [yak 72]% traceroute allspice.lcs.mit.edu.
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| 74 | * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
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| 75 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
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| 76 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
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| 77 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
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| 78 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
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| 79 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
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| 80 | * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
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| 81 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
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| 82 | * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
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| 83 | * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
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| 84 | * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
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| 85 | * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
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| 86 | * 12 * * *
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| 87 | * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
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| 88 | * 14 * * *
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| 89 | * 15 * * *
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| 90 | * 16 * * *
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| 91 | * 17 * * *
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| 92 | * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
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| 93 | *
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| 94 | * (I start to see why I'm having so much trouble with mail to
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| 95 | * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
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| 96 | * either don't send ICMP "time exceeded" messages or send them
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| 97 | * with a ttl too small to reach us. 14 - 17 are running the
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| 98 | * MIT C Gateway code that doesn't send "time exceeded"s. God
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| 99 | * only knows what's going on with 12.
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| 100 | *
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| 101 | * The silent gateway 12 in the above may be the result of a bug in
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| 102 | * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
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| 103 | * sends an unreachable message using whatever ttl remains in the
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| 104 | * original datagram. Since, for gateways, the remaining ttl is
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| 105 | * zero, the icmp "time exceeded" is guaranteed to not make it back
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| 106 | * to us. The behavior of this bug is slightly more interesting
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| 107 | * when it appears on the destination system:
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| 108 | *
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| 109 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
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| 110 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
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| 111 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
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| 112 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
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| 113 | * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
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| 114 | * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
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| 115 | * 7 * * *
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| 116 | * 8 * * *
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| 117 | * 9 * * *
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| 118 | * 10 * * *
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| 119 | * 11 * * *
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| 120 | * 12 * * *
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| 121 | * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
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| 122 | *
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| 123 | * Notice that there are 12 "gateways" (13 is the final
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| 124 | * destination) and exactly the last half of them are "missing".
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| 125 | * What's really happening is that rip (a Sun-3 running Sun OS3.5)
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| 126 | * is using the ttl from our arriving datagram as the ttl in its
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| 127 | * icmp reply. So, the reply will time out on the return path
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| 128 | * (with no notice sent to anyone since icmp's aren't sent for
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| 129 | * icmp's) until we probe with a ttl that's at least twice the path
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| 130 | * length. I.e., rip is really only 7 hops away. A reply that
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| 131 | * returns with a ttl of 1 is a clue this problem exists.
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| 132 | * Traceroute prints a "!" after the time if the ttl is <= 1.
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| 133 | * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
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| 134 | * non-standard (HPUX) software, expect to see this problem
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| 135 | * frequently and/or take care picking the target host of your
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| 136 | * probes.
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| 137 | *
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| 138 | * Other possible annotations after the time are !H, !N, !P (got a host,
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| 139 | * network or protocol unreachable, respectively), !S or !F (source
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| 140 | * route failed or fragmentation needed -- neither of these should
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| 141 | * ever occur and the associated gateway is busted if you see one). If
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| 142 | * almost all the probes result in some kind of unreachable, traceroute
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| 143 | * will give up and exit.
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| 144 | *
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| 145 | * Notes
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| 146 | * -----
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| 147 | * This program must be run by root or be setuid. (I suggest that
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| 148 | * you *don't* make it setuid -- casual use could result in a lot
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| 149 | * of unnecessary traffic on our poor, congested nets.)
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| 150 | *
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| 151 | * This program requires a kernel mod that does not appear in any
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| 152 | * system available from Berkeley: A raw ip socket using proto
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| 153 | * IPPROTO_RAW must interpret the data sent as an ip datagram (as
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| 154 | * opposed to data to be wrapped in a ip datagram). See the README
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| 155 | * file that came with the source to this program for a description
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| 156 | * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
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| 157 | * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
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| 158 | * MODIFIED TO RUN THIS PROGRAM.
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| 159 | *
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| 160 | * The udp port usage may appear bizarre (well, ok, it is bizarre).
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| 161 | * The problem is that an icmp message only contains 8 bytes of
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| 162 | * data from the original datagram. 8 bytes is the size of a udp
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| 163 | * header so, if we want to associate replies with the original
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| 164 | * datagram, the necessary information must be encoded into the
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| 165 | * udp header (the ip id could be used but there's no way to
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| 166 | * interlock with the kernel's assignment of ip id's and, anyway,
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| 167 | * it would have taken a lot more kernel hacking to allow this
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| 168 | * code to set the ip id). So, to allow two or more users to
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| 169 | * use traceroute simultaneously, we use this task's pid as the
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| 170 | * source port (the high bit is set to move the port number out
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| 171 | * of the "likely" range). To keep track of which probe is being
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| 172 | * replied to (so times and/or hop counts don't get confused by a
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| 173 | * reply that was delayed in transit), we increment the destination
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| 174 | * port number before each probe.
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| 175 | *
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| 176 | * Don't use this as a coding example. I was trying to find a
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| 177 | * routing problem and this code sort-of popped out after 48 hours
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| 178 | * without sleep. I was amazed it ever compiled, much less ran.
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| 179 | *
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| 180 | * I stole the idea for this program from Steve Deering. Since
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| 181 | * the first release, I've learned that had I attended the right
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| 182 | * IETF working group meetings, I also could have stolen it from Guy
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| 183 | * Almes or Matt Mathis. I don't know (or care) who came up with
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| 184 | * the idea first. I envy the originators' perspicacity and I'm
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| 185 | * glad they didn't keep the idea a secret.
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| 186 | *
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| 187 | * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
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| 188 | * enhancements to the original distribution.
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| 189 | *
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| 190 | * I've hacked up a round-trip-route version of this that works by
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| 191 | * sending a loose-source-routed udp datagram through the destination
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| 192 | * back to yourself. Unfortunately, SO many gateways botch source
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| 193 | * routing, the thing is almost worthless. Maybe one day...
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| 194 | *
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| 195 | * -- Van Jacobson (van@ee.lbl.gov)
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| 196 | * Tue Dec 20 03:50:13 PST 1988
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| 197 | */
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| 198 |
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| 199 | #undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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| 200 | //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
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| 201 | #undef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG /* not in documentation man */
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| 202 | #undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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| 203 | //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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| 204 | #undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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| 205 | //#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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| 206 |
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| 207 | #include <errno.h>
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| 208 | #include <stdio.h>
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| 209 | #include <stdlib.h>
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| 210 | #include <string.h>
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| 211 | #include <unistd.h>
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| 212 | #include <fcntl.h>
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| 213 | #include <netdb.h>
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| 214 | #include <endian.h>
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| 215 | #include <getopt.h>
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| 216 |
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| 217 | #include <sys/param.h>
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| 218 | #include <sys/file.h>
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| 219 | #include <sys/ioctl.h>
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| 220 | #include <sys/socket.h>
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| 221 | #include <sys/select.h>
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| 222 | #include "inet_common.h"
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| 223 |
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| 224 | #include <net/if.h>
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| 225 | #include <netinet/in.h>
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| 226 | #include <arpa/inet.h>
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| 227 | #include <netinet/udp.h>
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| 228 | #include <netinet/ip.h>
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| 229 | #include <netinet/ip_icmp.h>
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| 230 |
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| 231 | #include "busybox.h"
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| 232 |
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| 233 |
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| 234 | /*
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| 235 | * Definitions for internet protocol version 4.
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| 236 | * Per RFC 791, September 1981.
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| 237 | */
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| 238 | #define IPVERSION 4
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| 239 |
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| 240 | /*
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| 241 | * Overlay for ip header used by other protocols (tcp, udp).
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| 242 | */
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| 243 | struct ipovly {
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| 244 | unsigned char ih_x1[9]; /* (unused) */
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| 245 | unsigned char ih_pr; /* protocol */
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| 246 | short ih_len; /* protocol length */
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| 247 | struct in_addr ih_src; /* source internet address */
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| 248 | struct in_addr ih_dst; /* destination internet address */
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| 249 | };
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| 250 |
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| 251 | /*
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| 252 | * UDP kernel structures and variables.
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| 253 | */
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| 254 | struct udpiphdr {
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| 255 | struct ipovly ui_i; /* overlaid ip structure */
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| 256 | struct udphdr ui_u; /* udp header */
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| 257 | };
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| 258 | #define ui_next ui_i.ih_next
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| 259 | #define ui_prev ui_i.ih_prev
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| 260 | #define ui_x1 ui_i.ih_x1
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| 261 | #define ui_pr ui_i.ih_pr
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| 262 | #define ui_len ui_i.ih_len
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| 263 | #define ui_src ui_i.ih_src
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| 264 | #define ui_dst ui_i.ih_dst
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| 265 | #define ui_sport ui_u.uh_sport
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| 266 | #define ui_dport ui_u.uh_dport
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| 267 | #define ui_ulen ui_u.uh_ulen
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| 268 | #define ui_sum ui_u.uh_sum
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| 269 |
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| 270 |
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| 271 | /* Host name and address list */
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| 272 | struct hostinfo {
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| 273 | char *name;
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| 274 | int n;
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| 275 | u_int32_t *addrs;
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| 276 | };
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| 277 |
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| 278 | /* Data section of the probe packet */
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| 279 | struct outdata {
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| 280 | unsigned char seq; /* sequence number of this packet */
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| 281 | unsigned char ttl; /* ttl packet left with */
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| 282 | struct timeval tv ATTRIBUTE_PACKED; /* time packet left */
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| 283 | };
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| 284 |
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| 285 | struct IFADDRLIST {
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| 286 | u_int32_t addr;
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| 287 | char device[sizeof(struct ifreq)];
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| 288 | };
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| 289 |
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| 290 |
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| 291 | static const char route[] = "/proc/net/route";
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| 292 |
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| 293 | /* last inbound (icmp) packet */
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| 294 | static unsigned char packet[512] ATTRIBUTE_ALIGNED(32);
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| 295 |
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| 296 | static struct ip *outip; /* last output (udp) packet */
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| 297 | static struct udphdr *outudp; /* last output (udp) packet */
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| 298 | static struct outdata *outdata; /* last output (udp) packet */
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| 299 |
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| 300 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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| 301 | static struct icmp *outicmp; /* last output (icmp) packet */
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| 302 | #endif
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| 303 |
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| 304 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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| 305 | /* Maximum number of gateways (include room for one noop) */
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| 306 | #define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(u_int32_t)))
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| 307 | /* loose source route gateway list (including room for final destination) */
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| 308 | static u_int32_t gwlist[NGATEWAYS + 1];
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| 309 | #endif
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| 310 |
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| 311 | static int s; /* receive (icmp) socket file descriptor */
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| 312 | static int sndsock; /* send (udp/icmp) socket file descriptor */
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| 313 |
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| 314 | static struct sockaddr_storage whereto; /* Who to try to reach */
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| 315 | static struct sockaddr_storage wherefrom; /* Who we are */
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| 316 | static int packlen; /* total length of packet */
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| 317 | static int minpacket; /* min ip packet size */
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| 318 | static int maxpacket = 32 * 1024; /* max ip packet size */
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| 319 | static int pmtu; /* Path MTU Discovery (RFC1191) */
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| 320 |
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| 321 | static char *hostname;
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| 322 |
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| 323 | static u_short ident;
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| 324 | static u_short port = 32768 + 666; /* start udp dest port # for probe packets */
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| 325 |
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| 326 | static int waittime = 5; /* time to wait for response (in seconds) */
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| 327 | static int nflag; /* print addresses numerically */
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| 328 | static int doipcksum = 1; /* calculate ip checksums by default */
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| 329 |
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| 330 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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| 331 | static int optlen; /* length of ip options */
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| 332 | #else
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| 333 | #define optlen 0
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| 334 | #endif
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| 335 |
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| 336 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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| 337 | static int useicmp; /* use icmp echo instead of udp packets */
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| 338 | #endif
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| 339 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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| 340 | static int verbose;
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| 341 | #endif
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| 342 |
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| 343 | /*
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| 344 | * Return the interface list
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| 345 | */
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| 346 | static int
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| 347 | ifaddrlist(struct IFADDRLIST **ipaddrp)
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| 348 | {
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| 349 | int fd, nipaddr;
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| 350 | #ifdef HAVE_SOCKADDR_SA_LEN
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| 351 | int n;
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| 352 | #endif
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| 353 | struct ifreq *ifrp, *ifend, *ifnext;
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| 354 | struct sockaddr_in *addr_sin;
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| 355 | struct IFADDRLIST *al;
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| 356 | struct ifconf ifc;
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| 357 | struct ifreq ibuf[(32 * 1024) / sizeof(struct ifreq)], ifr;
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| 358 | struct IFADDRLIST *st_ifaddrlist;
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| 359 |
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| 360 | fd = bb_xsocket(AF_INET, SOCK_DGRAM, 0);
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| 361 |
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| 362 | ifc.ifc_len = sizeof(ibuf);
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| 363 | ifc.ifc_buf = (caddr_t)ibuf;
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| 364 |
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| 365 | if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
|
---|
| 366 | ifc.ifc_len < sizeof(struct ifreq)) {
|
---|
| 367 | if (errno == EINVAL)
|
---|
| 368 | bb_error_msg_and_die(
|
---|
| 369 | "SIOCGIFCONF: ifreq struct too small (%d bytes)",
|
---|
| 370 | (int)sizeof(ibuf));
|
---|
| 371 | else
|
---|
| 372 | bb_perror_msg_and_die("SIOCGIFCONF");
|
---|
| 373 | }
|
---|
| 374 | ifrp = ibuf;
|
---|
| 375 | ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
|
---|
| 376 |
|
---|
| 377 | nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq));
|
---|
| 378 | st_ifaddrlist = xcalloc(nipaddr, sizeof(struct IFADDRLIST));
|
---|
| 379 | al = st_ifaddrlist;
|
---|
| 380 | nipaddr = 0;
|
---|
| 381 |
|
---|
| 382 | for (; ifrp < ifend; ifrp = ifnext) {
|
---|
| 383 | #ifdef HAVE_SOCKADDR_SA_LEN
|
---|
| 384 | n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
|
---|
| 385 | if (n < sizeof(*ifrp))
|
---|
| 386 | ifnext = ifrp + 1;
|
---|
| 387 | else
|
---|
| 388 | ifnext = (struct ifreq *)((char *)ifrp + n);
|
---|
| 389 | if (ifrp->ifr_addr.sa_family != AF_INET)
|
---|
| 390 | continue;
|
---|
| 391 | #else
|
---|
| 392 | ifnext = ifrp + 1;
|
---|
| 393 | #endif
|
---|
| 394 | /*
|
---|
| 395 | * Need a template to preserve address info that is
|
---|
| 396 | * used below to locate the next entry. (Otherwise,
|
---|
| 397 | * SIOCGIFFLAGS stomps over it because the requests
|
---|
| 398 | * are returned in a union.)
|
---|
| 399 | */
|
---|
| 400 | strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
|
---|
| 401 | if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
|
---|
| 402 | if (errno == ENXIO)
|
---|
| 403 | continue;
|
---|
| 404 | bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s",
|
---|
| 405 | (int)sizeof(ifr.ifr_name), ifr.ifr_name);
|
---|
| 406 | }
|
---|
| 407 |
|
---|
| 408 | /* Must be up */
|
---|
| 409 | if ((ifr.ifr_flags & IFF_UP) == 0)
|
---|
| 410 | continue;
|
---|
| 411 |
|
---|
| 412 | safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1);
|
---|
| 413 | #ifdef sun
|
---|
| 414 | /* Ignore sun virtual interfaces */
|
---|
| 415 | if (strchr(al->device, ':') != NULL)
|
---|
| 416 | continue;
|
---|
| 417 | #endif
|
---|
| 418 | if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0)
|
---|
| 419 | bb_perror_msg_and_die("SIOCGIFADDR: %s", al->device);
|
---|
| 420 |
|
---|
| 421 | addr_sin = (struct sockaddr_in *)&ifr.ifr_addr;
|
---|
| 422 | al->addr = addr_sin->sin_addr.s_addr;
|
---|
| 423 | ++al;
|
---|
| 424 | ++nipaddr;
|
---|
| 425 | }
|
---|
| 426 | if(nipaddr == 0)
|
---|
| 427 | bb_error_msg_and_die ("Can't find any network interfaces");
|
---|
| 428 | (void)close(fd);
|
---|
| 429 |
|
---|
| 430 | *ipaddrp = st_ifaddrlist;
|
---|
| 431 | return nipaddr;
|
---|
| 432 | }
|
---|
| 433 |
|
---|
| 434 |
|
---|
| 435 | static void
|
---|
| 436 | setsin(struct sockaddr_in *addr_sin, u_int32_t addr)
|
---|
| 437 | {
|
---|
| 438 | memset(addr_sin, 0, sizeof(*addr_sin));
|
---|
| 439 | #ifdef HAVE_SOCKADDR_SA_LEN
|
---|
| 440 | addr_sin->sin_len = sizeof(*addr_sin);
|
---|
| 441 | #endif
|
---|
| 442 | addr_sin->sin_family = AF_INET;
|
---|
| 443 | addr_sin->sin_addr.s_addr = addr;
|
---|
| 444 | }
|
---|
| 445 |
|
---|
| 446 |
|
---|
| 447 | /*
|
---|
| 448 | * Return the source address for the given destination address
|
---|
| 449 | */
|
---|
| 450 | static void
|
---|
| 451 | findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
|
---|
| 452 | {
|
---|
| 453 | int i, n;
|
---|
| 454 | FILE *f;
|
---|
| 455 | u_int32_t mask;
|
---|
| 456 | u_int32_t dest, tmask;
|
---|
| 457 | struct IFADDRLIST *al;
|
---|
| 458 | char buf[256], tdevice[256], device[256];
|
---|
| 459 |
|
---|
| 460 | f = bb_xfopen(route, "r");
|
---|
| 461 |
|
---|
| 462 | /* Find the appropriate interface */
|
---|
| 463 | n = 0;
|
---|
| 464 | mask = 0;
|
---|
| 465 | device[0] = '\0';
|
---|
| 466 | while (fgets(buf, sizeof(buf), f) != NULL) {
|
---|
| 467 | ++n;
|
---|
| 468 | if (n == 1 && strncmp(buf, "Iface", 5) == 0)
|
---|
| 469 | continue;
|
---|
| 470 | if ((i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x",
|
---|
| 471 | tdevice, &dest, &tmask)) != 3)
|
---|
| 472 | bb_error_msg_and_die ("junk in buffer");
|
---|
| 473 | if ((to->sin_addr.s_addr & tmask) == dest &&
|
---|
| 474 | (tmask > mask || mask == 0)) {
|
---|
| 475 | mask = tmask;
|
---|
| 476 | strcpy(device, tdevice);
|
---|
| 477 | }
|
---|
| 478 | }
|
---|
| 479 | fclose(f);
|
---|
| 480 |
|
---|
| 481 | if (device[0] == '\0')
|
---|
| 482 | bb_error_msg_and_die ("Can't find interface");
|
---|
| 483 |
|
---|
| 484 | /* Get the interface address list */
|
---|
| 485 | n = ifaddrlist(&al);
|
---|
| 486 |
|
---|
| 487 | /* Find our appropriate source address */
|
---|
| 488 | for (i = n; i > 0; --i, ++al)
|
---|
| 489 | if (strcmp(device, al->device) == 0)
|
---|
| 490 | break;
|
---|
| 491 | if (i <= 0)
|
---|
| 492 | bb_error_msg_and_die("Can't find interface %s", device);
|
---|
| 493 |
|
---|
| 494 | setsin(from, al->addr);
|
---|
| 495 | }
|
---|
| 496 |
|
---|
| 497 | /*
|
---|
| 498 | "Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n"
|
---|
| 499 | "\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n"
|
---|
| 500 | "\t[-w waittime] [-z pausemsecs] host [packetlen]"
|
---|
| 501 |
|
---|
| 502 | */
|
---|
| 503 |
|
---|
| 504 | /* String to value with optional min and max. Handles decimal and hex. */
|
---|
| 505 | static int
|
---|
| 506 | str2val(const char *str, const char *what, int mi, int ma)
|
---|
| 507 | {
|
---|
| 508 | const char *cp;
|
---|
| 509 | int val;
|
---|
| 510 | char *ep;
|
---|
| 511 |
|
---|
| 512 | if (str[0] == '0' && (str[1] == 'x' || str[1] == 'X')) {
|
---|
| 513 | cp = str + 2;
|
---|
| 514 | val = (int)strtol(cp, &ep, 16);
|
---|
| 515 | } else
|
---|
| 516 | val = (int)strtol(str, &ep, 10);
|
---|
| 517 | if (*ep != '\0') {
|
---|
| 518 | bb_error_msg_and_die("\"%s\" bad value for %s \n", str, what);
|
---|
| 519 | }
|
---|
| 520 | if (val < mi && mi >= 0) {
|
---|
| 521 | if (mi == 0)
|
---|
| 522 | bb_error_msg_and_die("%s must be >= %d\n", what, mi);
|
---|
| 523 | else
|
---|
| 524 | bb_error_msg_and_die("%s must be > %d\n", what, mi - 1);
|
---|
| 525 | }
|
---|
| 526 | if (val > ma && ma >= 0)
|
---|
| 527 | bb_error_msg_and_die("%s must be <= %d\n", what, ma);
|
---|
| 528 | return val;
|
---|
| 529 | }
|
---|
| 530 |
|
---|
| 531 |
|
---|
| 532 | /*
|
---|
| 533 | * Subtract 2 timeval structs: out = out - in.
|
---|
| 534 | * Out is assumed to be >= in.
|
---|
| 535 | */
|
---|
| 536 | static inline void
|
---|
| 537 | tvsub(struct timeval *out, struct timeval *in)
|
---|
| 538 | {
|
---|
| 539 |
|
---|
| 540 | if ((out->tv_usec -= in->tv_usec) < 0) {
|
---|
| 541 | --out->tv_sec;
|
---|
| 542 | out->tv_usec += 1000000;
|
---|
| 543 | }
|
---|
| 544 | out->tv_sec -= in->tv_sec;
|
---|
| 545 | }
|
---|
| 546 |
|
---|
| 547 | static int
|
---|
| 548 | wait_for_reply(int sock, struct sockaddr_in *fromp, const struct timeval *tp)
|
---|
| 549 | {
|
---|
| 550 | fd_set fds;
|
---|
| 551 | struct timeval now, wait;
|
---|
| 552 | struct timezone tz;
|
---|
| 553 | int cc = 0;
|
---|
| 554 | socklen_t fromlen = sizeof(*fromp);
|
---|
| 555 |
|
---|
| 556 | FD_ZERO(&fds);
|
---|
| 557 | FD_SET(sock, &fds);
|
---|
| 558 |
|
---|
| 559 | wait.tv_sec = tp->tv_sec + waittime;
|
---|
| 560 | wait.tv_usec = tp->tv_usec;
|
---|
| 561 | (void)gettimeofday(&now, &tz);
|
---|
| 562 | tvsub(&wait, &now);
|
---|
| 563 |
|
---|
| 564 | if (select(sock + 1, &fds, NULL, NULL, &wait) > 0)
|
---|
| 565 | cc = recvfrom(sock, (char *)packet, sizeof(packet), 0,
|
---|
| 566 | (struct sockaddr *)fromp, &fromlen);
|
---|
| 567 |
|
---|
| 568 | return cc;
|
---|
| 569 | }
|
---|
| 570 |
|
---|
| 571 | /*
|
---|
| 572 | * Checksum routine for Internet Protocol family headers (C Version)
|
---|
| 573 | */
|
---|
| 574 | static u_short
|
---|
| 575 | in_cksum(u_short *addr, int len)
|
---|
| 576 | {
|
---|
| 577 | int nleft = len;
|
---|
| 578 | u_short *w = addr;
|
---|
| 579 | u_short answer;
|
---|
| 580 | int sum = 0;
|
---|
| 581 |
|
---|
| 582 | /*
|
---|
| 583 | * Our algorithm is simple, using a 32 bit accumulator (sum),
|
---|
| 584 | * we add sequential 16 bit words to it, and at the end, fold
|
---|
| 585 | * back all the carry bits from the top 16 bits into the lower
|
---|
| 586 | * 16 bits.
|
---|
| 587 | */
|
---|
| 588 | while (nleft > 1) {
|
---|
| 589 | sum += *w++;
|
---|
| 590 | nleft -= 2;
|
---|
| 591 | }
|
---|
| 592 |
|
---|
| 593 | /* mop up an odd byte, if necessary */
|
---|
| 594 | if (nleft == 1)
|
---|
| 595 | sum += *(unsigned char *)w;
|
---|
| 596 |
|
---|
| 597 | /*
|
---|
| 598 | * add back carry outs from top 16 bits to low 16 bits
|
---|
| 599 | */
|
---|
| 600 | sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
|
---|
| 601 | sum += (sum >> 16); /* add carry */
|
---|
| 602 | answer = ~sum; /* truncate to 16 bits */
|
---|
| 603 | return answer;
|
---|
| 604 | }
|
---|
| 605 |
|
---|
| 606 |
|
---|
| 607 | static void
|
---|
| 608 | send_probe(int seq, int ttl, struct timeval *tp)
|
---|
| 609 | {
|
---|
| 610 | int cc;
|
---|
| 611 | struct udpiphdr *ui, *oui;
|
---|
| 612 | struct ip tip;
|
---|
| 613 |
|
---|
| 614 | outip->ip_ttl = ttl;
|
---|
| 615 | outip->ip_id = htons(ident + seq);
|
---|
| 616 |
|
---|
| 617 | /*
|
---|
| 618 | * In most cases, the kernel will recalculate the ip checksum.
|
---|
| 619 | * But we must do it anyway so that the udp checksum comes out
|
---|
| 620 | * right.
|
---|
| 621 | */
|
---|
| 622 | if (doipcksum) {
|
---|
| 623 | outip->ip_sum =
|
---|
| 624 | in_cksum((u_short *)outip, sizeof(*outip) + optlen);
|
---|
| 625 | if (outip->ip_sum == 0)
|
---|
| 626 | outip->ip_sum = 0xffff;
|
---|
| 627 | }
|
---|
| 628 |
|
---|
| 629 | /* Payload */
|
---|
| 630 | outdata->seq = seq;
|
---|
| 631 | outdata->ttl = ttl;
|
---|
| 632 | memcpy(&outdata->tv, tp, sizeof(outdata->tv));
|
---|
| 633 |
|
---|
| 634 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
|
---|
| 635 | if (useicmp)
|
---|
| 636 | outicmp->icmp_seq = htons(seq);
|
---|
| 637 | else
|
---|
| 638 | #endif
|
---|
| 639 | outudp->dest = htons(port + seq);
|
---|
| 640 |
|
---|
| 641 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
|
---|
| 642 | if (useicmp) {
|
---|
| 643 | /* Always calculate checksum for icmp packets */
|
---|
| 644 | outicmp->icmp_cksum = 0;
|
---|
| 645 | outicmp->icmp_cksum = in_cksum((u_short *)outicmp,
|
---|
| 646 | packlen - (sizeof(*outip) + optlen));
|
---|
| 647 | if (outicmp->icmp_cksum == 0)
|
---|
| 648 | outicmp->icmp_cksum = 0xffff;
|
---|
| 649 | } else
|
---|
| 650 | #endif
|
---|
| 651 | if (doipcksum) {
|
---|
| 652 | /* Checksum (we must save and restore ip header) */
|
---|
| 653 | tip = *outip;
|
---|
| 654 | ui = (struct udpiphdr *)outip;
|
---|
| 655 | oui = (struct udpiphdr *)&tip;
|
---|
| 656 | /* Easier to zero and put back things that are ok */
|
---|
| 657 | memset((char *)ui, 0, sizeof(ui->ui_i));
|
---|
| 658 | ui->ui_src = oui->ui_src;
|
---|
| 659 | ui->ui_dst = oui->ui_dst;
|
---|
| 660 | ui->ui_pr = oui->ui_pr;
|
---|
| 661 | ui->ui_len = outudp->len;
|
---|
| 662 | outudp->check = 0;
|
---|
| 663 | outudp->check = in_cksum((u_short *)ui, packlen);
|
---|
| 664 | if (outudp->check == 0)
|
---|
| 665 | outudp->check = 0xffff;
|
---|
| 666 | *outip = tip;
|
---|
| 667 | }
|
---|
| 668 |
|
---|
| 669 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 670 | /* XXX undocumented debugging hack */
|
---|
| 671 | if (verbose > 1) {
|
---|
| 672 | const u_short *sp;
|
---|
| 673 | int nshorts, i;
|
---|
| 674 |
|
---|
| 675 | sp = (u_short *)outip;
|
---|
| 676 | nshorts = (u_int)packlen / sizeof(u_short);
|
---|
| 677 | i = 0;
|
---|
| 678 | printf("[ %d bytes", packlen);
|
---|
| 679 | while (--nshorts >= 0) {
|
---|
| 680 | if ((i++ % 8) == 0)
|
---|
| 681 | printf("\n\t");
|
---|
| 682 | printf(" %04x", ntohs(*sp));
|
---|
| 683 | sp++;
|
---|
| 684 | }
|
---|
| 685 | if (packlen & 1) {
|
---|
| 686 | if ((i % 8) == 0)
|
---|
| 687 | printf("\n\t");
|
---|
| 688 | printf(" %02x", *(unsigned char *)sp);
|
---|
| 689 | }
|
---|
| 690 | printf("]\n");
|
---|
| 691 | }
|
---|
| 692 | #endif
|
---|
| 693 |
|
---|
| 694 | #if !defined(IP_HDRINCL) && defined(IP_TTL)
|
---|
| 695 | if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
|
---|
| 696 | (char *)&ttl, sizeof(ttl)) < 0) {
|
---|
| 697 | bb_perror_msg_and_die("setsockopt ttl %d", ttl);
|
---|
| 698 | }
|
---|
| 699 | #endif
|
---|
| 700 |
|
---|
| 701 | cc = sendto(sndsock, (char *)outip,
|
---|
| 702 | packlen, 0, (struct sockaddr *)&whereto, sizeof(whereto));
|
---|
| 703 | if (cc < 0 || cc != packlen) {
|
---|
| 704 | if (cc < 0)
|
---|
| 705 | bb_perror_msg_and_die("sendto");
|
---|
| 706 | printf("%s: wrote %s %d chars, ret=%d\n",
|
---|
| 707 | bb_applet_name, hostname, packlen, cc);
|
---|
| 708 | (void)fflush(stdout);
|
---|
| 709 | }
|
---|
| 710 | }
|
---|
| 711 |
|
---|
| 712 | static inline double
|
---|
| 713 | deltaT(struct timeval *t1p, struct timeval *t2p)
|
---|
| 714 | {
|
---|
| 715 | double dt;
|
---|
| 716 |
|
---|
| 717 | dt = (double)(t2p->tv_sec - t1p->tv_sec) * 1000.0 +
|
---|
| 718 | (double)(t2p->tv_usec - t1p->tv_usec) / 1000.0;
|
---|
| 719 | return dt;
|
---|
| 720 | }
|
---|
| 721 |
|
---|
| 722 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 723 | /*
|
---|
| 724 | * Convert an ICMP "type" field to a printable string.
|
---|
| 725 | */
|
---|
| 726 | static inline const char *
|
---|
| 727 | pr_type(unsigned char t)
|
---|
| 728 | {
|
---|
| 729 | static const char * const ttab[] = {
|
---|
| 730 | "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
|
---|
| 731 | "Source Quench", "Redirect", "ICMP 6", "ICMP 7",
|
---|
| 732 | "Echo", "Router Advert", "Router Solicit", "Time Exceeded",
|
---|
| 733 | "Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
|
---|
| 734 | "Info Reply", "Mask Request", "Mask Reply"
|
---|
| 735 | };
|
---|
| 736 |
|
---|
| 737 | if (t > 18)
|
---|
| 738 | return "OUT-OF-RANGE";
|
---|
| 739 |
|
---|
| 740 | return ttab[t];
|
---|
| 741 | }
|
---|
| 742 | #endif
|
---|
| 743 |
|
---|
| 744 | static int
|
---|
| 745 | packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq)
|
---|
| 746 | {
|
---|
| 747 | struct icmp *icp;
|
---|
| 748 | unsigned char type, code;
|
---|
| 749 | int hlen;
|
---|
| 750 | struct ip *ip;
|
---|
| 751 |
|
---|
| 752 | ip = (struct ip *) buf;
|
---|
| 753 | hlen = ip->ip_hl << 2;
|
---|
| 754 | if (cc < hlen + ICMP_MINLEN) {
|
---|
| 755 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 756 | if (verbose)
|
---|
| 757 | printf("packet too short (%d bytes) from %s\n", cc,
|
---|
| 758 | inet_ntoa(from->sin_addr));
|
---|
| 759 | #endif
|
---|
| 760 | return 0;
|
---|
| 761 | }
|
---|
| 762 | cc -= hlen;
|
---|
| 763 | icp = (struct icmp *)(buf + hlen);
|
---|
| 764 | type = icp->icmp_type;
|
---|
| 765 | code = icp->icmp_code;
|
---|
| 766 | /* Path MTU Discovery (RFC1191) */
|
---|
| 767 | if (code != ICMP_UNREACH_NEEDFRAG)
|
---|
| 768 | pmtu = 0;
|
---|
| 769 | else {
|
---|
| 770 | pmtu = ntohs(icp->icmp_nextmtu);
|
---|
| 771 | }
|
---|
| 772 | if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
|
---|
| 773 | type == ICMP_UNREACH || type == ICMP_ECHOREPLY) {
|
---|
| 774 | struct ip *hip;
|
---|
| 775 | struct udphdr *up;
|
---|
| 776 |
|
---|
| 777 | hip = &icp->icmp_ip;
|
---|
| 778 | hlen = hip->ip_hl << 2;
|
---|
| 779 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
|
---|
| 780 | if (useicmp) {
|
---|
| 781 | struct icmp *hicmp;
|
---|
| 782 |
|
---|
| 783 | /* XXX */
|
---|
| 784 | if (type == ICMP_ECHOREPLY &&
|
---|
| 785 | icp->icmp_id == htons(ident) &&
|
---|
| 786 | icp->icmp_seq == htons(seq))
|
---|
| 787 | return -2;
|
---|
| 788 |
|
---|
| 789 | hicmp = (struct icmp *)((unsigned char *)hip + hlen);
|
---|
| 790 | /* XXX 8 is a magic number */
|
---|
| 791 | if (hlen + 8 <= cc &&
|
---|
| 792 | hip->ip_p == IPPROTO_ICMP &&
|
---|
| 793 | hicmp->icmp_id == htons(ident) &&
|
---|
| 794 | hicmp->icmp_seq == htons(seq))
|
---|
| 795 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
| 796 | } else
|
---|
| 797 | #endif
|
---|
| 798 | {
|
---|
| 799 | up = (struct udphdr *)((unsigned char *)hip + hlen);
|
---|
| 800 | /* XXX 8 is a magic number */
|
---|
| 801 | if (hlen + 12 <= cc &&
|
---|
| 802 | hip->ip_p == IPPROTO_UDP &&
|
---|
| 803 | up->source == htons(ident) &&
|
---|
| 804 | up->dest == htons(port + seq))
|
---|
| 805 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
| 806 | }
|
---|
| 807 | }
|
---|
| 808 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 809 | if (verbose) {
|
---|
| 810 | int i;
|
---|
| 811 | u_int32_t *lp = (u_int32_t *)&icp->icmp_ip;
|
---|
| 812 |
|
---|
| 813 | printf("\n%d bytes from %s to "
|
---|
| 814 | "%s: icmp type %d (%s) code %d\n",
|
---|
| 815 | cc, inet_ntoa(from->sin_addr),
|
---|
| 816 | inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code);
|
---|
| 817 | for (i = 4; i < cc ; i += sizeof(*lp))
|
---|
| 818 | printf("%2d: x%8.8x\n", i, *lp++);
|
---|
| 819 | }
|
---|
| 820 | #endif
|
---|
| 821 | return 0;
|
---|
| 822 | }
|
---|
| 823 |
|
---|
| 824 |
|
---|
| 825 | /*
|
---|
| 826 | * Construct an Internet address representation.
|
---|
| 827 | * If the nflag has been supplied, give
|
---|
| 828 | * numeric value, otherwise try for symbolic name.
|
---|
| 829 | */
|
---|
| 830 | static inline void
|
---|
| 831 | inetname(struct sockaddr_in *from)
|
---|
| 832 | {
|
---|
| 833 | const char *n = NULL;
|
---|
| 834 | const char *ina;
|
---|
| 835 | char name[257];
|
---|
| 836 |
|
---|
| 837 | if (!nflag && from->sin_addr.s_addr != INADDR_ANY) {
|
---|
| 838 | if(INET_rresolve(name, sizeof(name), from, 0x4000, 0xffffffff) >= 0)
|
---|
| 839 | n = name;
|
---|
| 840 | }
|
---|
| 841 | ina = inet_ntoa(from->sin_addr);
|
---|
| 842 | if (nflag)
|
---|
| 843 | printf(" %s", ina);
|
---|
| 844 | else
|
---|
| 845 | printf(" %s (%s)", (n ? n : ina), ina);
|
---|
| 846 | }
|
---|
| 847 |
|
---|
| 848 | static inline void
|
---|
| 849 | print(unsigned char *buf, int cc, struct sockaddr_in *from)
|
---|
| 850 | {
|
---|
| 851 | struct ip *ip;
|
---|
| 852 | int hlen;
|
---|
| 853 |
|
---|
| 854 | ip = (struct ip *) buf;
|
---|
| 855 | hlen = ip->ip_hl << 2;
|
---|
| 856 | cc -= hlen;
|
---|
| 857 |
|
---|
| 858 | inetname(from);
|
---|
| 859 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 860 | if (verbose)
|
---|
| 861 | printf(" %d bytes to %s", cc, inet_ntoa (ip->ip_dst));
|
---|
| 862 | #endif
|
---|
| 863 | }
|
---|
| 864 |
|
---|
| 865 |
|
---|
| 866 | static struct hostinfo *
|
---|
| 867 | gethostinfo(const char *host)
|
---|
| 868 | {
|
---|
| 869 | int n;
|
---|
| 870 | struct hostent *hp;
|
---|
| 871 | struct hostinfo *hi;
|
---|
| 872 | char **p;
|
---|
| 873 | u_int32_t addr, *ap;
|
---|
| 874 |
|
---|
| 875 | hi = xcalloc(1, sizeof(*hi));
|
---|
| 876 | addr = inet_addr(host);
|
---|
| 877 | if ((int32_t)addr != -1) {
|
---|
| 878 | hi->name = bb_xstrdup(host);
|
---|
| 879 | hi->n = 1;
|
---|
| 880 | hi->addrs = xcalloc(1, sizeof(hi->addrs[0]));
|
---|
| 881 | hi->addrs[0] = addr;
|
---|
| 882 | return hi;
|
---|
| 883 | }
|
---|
| 884 |
|
---|
| 885 | hp = xgethostbyname(host);
|
---|
| 886 | if (hp->h_addrtype != AF_INET || hp->h_length != 4)
|
---|
| 887 | bb_perror_msg_and_die("bad host %s", host);
|
---|
| 888 | hi->name = bb_xstrdup(hp->h_name);
|
---|
| 889 | for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
|
---|
| 890 | continue;
|
---|
| 891 | hi->n = n;
|
---|
| 892 | hi->addrs = xcalloc(n, sizeof(hi->addrs[0]));
|
---|
| 893 | for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
|
---|
| 894 | memcpy(ap, *p, sizeof(*ap));
|
---|
| 895 | return hi;
|
---|
| 896 | }
|
---|
| 897 |
|
---|
| 898 | static void
|
---|
| 899 | freehostinfo(struct hostinfo *hi)
|
---|
| 900 | {
|
---|
| 901 | free(hi->name);
|
---|
| 902 | hi->name = NULL;
|
---|
| 903 | free((char *)hi->addrs);
|
---|
| 904 | free((char *)hi);
|
---|
| 905 | }
|
---|
| 906 |
|
---|
| 907 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 908 | static void
|
---|
| 909 | getaddr(u_int32_t *ap, const char *host)
|
---|
| 910 | {
|
---|
| 911 | struct hostinfo *hi;
|
---|
| 912 |
|
---|
| 913 | hi = gethostinfo(host);
|
---|
| 914 | *ap = hi->addrs[0];
|
---|
| 915 | freehostinfo(hi);
|
---|
| 916 | }
|
---|
| 917 | #endif
|
---|
| 918 |
|
---|
| 919 |
|
---|
| 920 | int
|
---|
| 921 | traceroute_main(int argc, char *argv[])
|
---|
| 922 | {
|
---|
| 923 | int code, n;
|
---|
| 924 | char *cp;
|
---|
| 925 | unsigned char *outp;
|
---|
| 926 | u_int32_t *ap;
|
---|
| 927 | struct sockaddr_in *from = (struct sockaddr_in *)&wherefrom;
|
---|
| 928 | struct sockaddr_in *to = (struct sockaddr_in *)&whereto;
|
---|
| 929 | struct hostinfo *hi;
|
---|
| 930 | int on = 1;
|
---|
| 931 | struct protoent *pe;
|
---|
| 932 | int ttl, probe, i;
|
---|
| 933 | int seq = 0;
|
---|
| 934 | int tos = 0;
|
---|
| 935 | char *tos_str = NULL;
|
---|
| 936 | char *source = NULL;
|
---|
| 937 | unsigned long op;
|
---|
| 938 |
|
---|
| 939 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 940 | int lsrr = 0;
|
---|
| 941 | #endif
|
---|
| 942 | u_short off = 0;
|
---|
| 943 | struct IFADDRLIST *al;
|
---|
| 944 | char *device = NULL;
|
---|
| 945 | int max_ttl = 30;
|
---|
| 946 | char *max_ttl_str = NULL;
|
---|
| 947 | char *port_str = NULL;
|
---|
| 948 | int nprobes = 3;
|
---|
| 949 | char *nprobes_str = NULL;
|
---|
| 950 | char *waittime_str = NULL;
|
---|
| 951 | u_int pausemsecs = 0;
|
---|
| 952 | char *pausemsecs_str = NULL;
|
---|
| 953 | int first_ttl = 1;
|
---|
| 954 | char *first_ttl_str = NULL;
|
---|
| 955 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 956 | llist_t *sourse_route_list = NULL;
|
---|
| 957 | #endif
|
---|
| 958 |
|
---|
| 959 | opterr = 0;
|
---|
| 960 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 961 | bb_opt_complementally = "x-x:g::";
|
---|
| 962 | #else
|
---|
| 963 | bb_opt_complementally = "x-x";
|
---|
| 964 | #endif
|
---|
| 965 |
|
---|
| 966 | op = bb_getopt_ulflags(argc, argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:"
|
---|
| 967 | #define USAGE_OP_DONT_FRAGMNT (1<<0) /* F */
|
---|
| 968 | #define USAGE_OP_USE_ICMP (1<<1) /* I */
|
---|
| 969 | #define USAGE_OP_TTL_FLAG (1<<2) /* l */
|
---|
| 970 | #define USAGE_OP_ADDR_NUM (1<<3) /* n */
|
---|
| 971 | #define USAGE_OP_BYPASS_ROUTE (1<<4) /* r */
|
---|
| 972 | #define USAGE_OP_DEBUG (1<<5) /* d */
|
---|
| 973 | #define USAGE_OP_VERBOSE (1<<6) /* v */
|
---|
| 974 | #define USAGE_OP_IP_CHKSUM (1<<7) /* x */
|
---|
| 975 |
|
---|
| 976 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 977 | "g:"
|
---|
| 978 | #endif
|
---|
| 979 | , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str,
|
---|
| 980 | &source, &waittime_str, &pausemsecs_str, &first_ttl_str
|
---|
| 981 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 982 | , &sourse_route_list
|
---|
| 983 | #endif
|
---|
| 984 | );
|
---|
| 985 |
|
---|
| 986 | if(op & USAGE_OP_DONT_FRAGMNT)
|
---|
| 987 | off = IP_DF;
|
---|
| 988 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
|
---|
| 989 | useicmp = op & USAGE_OP_USE_ICMP;
|
---|
| 990 | #endif
|
---|
| 991 | nflag = op & USAGE_OP_ADDR_NUM;
|
---|
| 992 | #ifdef CONFIG_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 993 | verbose = op & USAGE_OP_VERBOSE;
|
---|
| 994 | #endif
|
---|
| 995 | if(op & USAGE_OP_IP_CHKSUM) {
|
---|
| 996 | doipcksum = 0;
|
---|
| 997 | bb_error_msg("Warning: ip checksums disabled");
|
---|
| 998 | }
|
---|
| 999 | if (tos_str)
|
---|
| 1000 | tos = str2val(tos_str, "tos", 0, 255);
|
---|
| 1001 | if(max_ttl_str)
|
---|
| 1002 | max_ttl = str2val(max_ttl_str, "max ttl", 1, 255);
|
---|
| 1003 | if(port_str)
|
---|
| 1004 | port = (u_short)str2val(port_str, "port", 1, (1 << 16) - 1);
|
---|
| 1005 | if(nprobes_str)
|
---|
[904] | 1006 | nprobes = str2val(nprobes_str, "nprobes", 1, -1);
|
---|
[821] | 1007 | if(source) {
|
---|
| 1008 | /*
|
---|
| 1009 | * set the ip source address of the outbound
|
---|
| 1010 | * probe (e.g., on a multi-homed host).
|
---|
| 1011 | */
|
---|
| 1012 | if (getuid()) bb_error_msg_and_die("-s %s: Permission denied", source);
|
---|
| 1013 | }
|
---|
| 1014 | if(waittime_str)
|
---|
| 1015 | waittime = str2val(waittime_str, "wait time", 2, 24 * 60 * 60);
|
---|
| 1016 | if(pausemsecs_str)
|
---|
| 1017 | pausemsecs = str2val(pausemsecs_str, "pause msecs", 0, 60 * 60 * 1000);
|
---|
| 1018 | if(first_ttl_str)
|
---|
| 1019 | first_ttl = str2val(first_ttl_str, "first ttl", 1, 255);
|
---|
| 1020 |
|
---|
| 1021 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 1022 | if(sourse_route_list) {
|
---|
| 1023 | llist_t *l_sr;
|
---|
| 1024 |
|
---|
| 1025 | for(l_sr = sourse_route_list; l_sr; ) {
|
---|
| 1026 | if (lsrr >= NGATEWAYS)
|
---|
| 1027 | bb_error_msg_and_die("No more than %d gateways", NGATEWAYS);
|
---|
| 1028 | getaddr(gwlist + lsrr, l_sr->data);
|
---|
| 1029 | ++lsrr;
|
---|
| 1030 | l_sr = l_sr->link;
|
---|
| 1031 | free(sourse_route_list);
|
---|
| 1032 | sourse_route_list = l_sr;
|
---|
| 1033 | }
|
---|
| 1034 | optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
---|
| 1035 | }
|
---|
| 1036 | #endif
|
---|
| 1037 |
|
---|
| 1038 | if (first_ttl > max_ttl) {
|
---|
| 1039 | bb_error_msg_and_die(
|
---|
| 1040 | "first ttl (%d) may not be greater than max ttl (%d)",
|
---|
| 1041 | first_ttl, max_ttl);
|
---|
| 1042 | }
|
---|
| 1043 |
|
---|
| 1044 | minpacket = sizeof(*outip) + sizeof(*outdata) + optlen;
|
---|
| 1045 |
|
---|
| 1046 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
|
---|
| 1047 | if (useicmp)
|
---|
| 1048 | minpacket += 8; /* XXX magic number */
|
---|
| 1049 | else
|
---|
| 1050 | #endif
|
---|
| 1051 | minpacket += sizeof(*outudp);
|
---|
| 1052 | packlen = minpacket; /* minimum sized packet */
|
---|
| 1053 |
|
---|
| 1054 | /* Process destination and optional packet size */
|
---|
| 1055 | switch (argc - optind) {
|
---|
| 1056 |
|
---|
| 1057 | case 2:
|
---|
| 1058 | packlen = str2val(argv[optind + 1],
|
---|
| 1059 | "packet length", minpacket, maxpacket);
|
---|
| 1060 | /* Fall through */
|
---|
| 1061 |
|
---|
| 1062 | case 1:
|
---|
| 1063 | hostname = argv[optind];
|
---|
| 1064 | hi = gethostinfo(hostname);
|
---|
| 1065 | setsin(to, hi->addrs[0]);
|
---|
| 1066 | if (hi->n > 1)
|
---|
| 1067 | bb_error_msg(
|
---|
| 1068 | "Warning: %s has multiple addresses; using %s",
|
---|
| 1069 | hostname, inet_ntoa(to->sin_addr));
|
---|
| 1070 | hostname = hi->name;
|
---|
| 1071 | hi->name = NULL;
|
---|
| 1072 | freehostinfo(hi);
|
---|
| 1073 | break;
|
---|
| 1074 |
|
---|
| 1075 | default:
|
---|
| 1076 | bb_show_usage();
|
---|
| 1077 | }
|
---|
| 1078 |
|
---|
| 1079 | cp = "icmp";
|
---|
| 1080 | if ((pe = getprotobyname(cp)) == NULL)
|
---|
| 1081 | bb_perror_msg_and_die("unknown protocol %s", cp);
|
---|
| 1082 |
|
---|
| 1083 | /* Insure the socket fds won't be 0, 1 or 2 */
|
---|
| 1084 | do n = bb_xopen(bb_dev_null, O_RDONLY); while (n < 2);
|
---|
| 1085 | if (n > 2)
|
---|
| 1086 | close(n);
|
---|
| 1087 |
|
---|
| 1088 | s = bb_xsocket(AF_INET, SOCK_RAW, pe->p_proto);
|
---|
| 1089 |
|
---|
| 1090 | #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
|
---|
| 1091 | if (op & USAGE_OP_DEBUG)
|
---|
| 1092 | (void)setsockopt(s, SOL_SOCKET, SO_DEBUG, (char *)&on,
|
---|
| 1093 | sizeof(on));
|
---|
| 1094 | #endif
|
---|
| 1095 | if (op & USAGE_OP_BYPASS_ROUTE)
|
---|
| 1096 | (void)setsockopt(s, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
|
---|
| 1097 | sizeof(on));
|
---|
| 1098 |
|
---|
| 1099 | sndsock = bb_xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
|
---|
| 1100 |
|
---|
| 1101 | #ifdef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 1102 | #if defined(IP_OPTIONS)
|
---|
| 1103 | if (lsrr > 0) {
|
---|
| 1104 | unsigned char optlist[MAX_IPOPTLEN];
|
---|
| 1105 |
|
---|
| 1106 | cp = "ip";
|
---|
| 1107 | if ((pe = getprotobyname(cp)) == NULL)
|
---|
| 1108 | bb_perror_msg_and_die("unknown protocol");
|
---|
| 1109 |
|
---|
| 1110 | /* final hop */
|
---|
| 1111 | gwlist[lsrr] = to->sin_addr.s_addr;
|
---|
| 1112 | ++lsrr;
|
---|
| 1113 |
|
---|
| 1114 | /* force 4 byte alignment */
|
---|
| 1115 | optlist[0] = IPOPT_NOP;
|
---|
| 1116 | /* loose source route option */
|
---|
| 1117 | optlist[1] = IPOPT_LSRR;
|
---|
| 1118 | i = lsrr * sizeof(gwlist[0]);
|
---|
| 1119 | optlist[2] = i + 3;
|
---|
| 1120 | /* Pointer to LSRR addresses */
|
---|
| 1121 | optlist[3] = IPOPT_MINOFF;
|
---|
| 1122 | memcpy(optlist + 4, gwlist, i);
|
---|
| 1123 |
|
---|
| 1124 | if ((setsockopt(sndsock, pe->p_proto, IP_OPTIONS,
|
---|
| 1125 | (char *)optlist, i + sizeof(gwlist[0]))) < 0) {
|
---|
| 1126 | bb_perror_msg_and_die("IP_OPTIONS");
|
---|
| 1127 | }
|
---|
| 1128 | }
|
---|
| 1129 | #endif /* IP_OPTIONS */
|
---|
| 1130 | #endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */
|
---|
| 1131 |
|
---|
| 1132 | #ifdef SO_SNDBUF
|
---|
| 1133 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, (char *)&packlen,
|
---|
| 1134 | sizeof(packlen)) < 0) {
|
---|
| 1135 | bb_perror_msg_and_die("SO_SNDBUF");
|
---|
| 1136 | }
|
---|
| 1137 | #endif
|
---|
| 1138 | #ifdef IP_HDRINCL
|
---|
| 1139 | if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, (char *)&on,
|
---|
| 1140 | sizeof(on)) < 0 && errno != ENOPROTOOPT) {
|
---|
| 1141 | bb_perror_msg_and_die("IP_HDRINCL");
|
---|
| 1142 | }
|
---|
| 1143 | #else
|
---|
| 1144 | #ifdef IP_TOS
|
---|
| 1145 | if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS,
|
---|
| 1146 | (char *)&tos, sizeof(tos)) < 0) {
|
---|
| 1147 | bb_perror_msg_and_die("setsockopt tos %d", tos);
|
---|
| 1148 | }
|
---|
| 1149 | #endif
|
---|
| 1150 | #endif
|
---|
| 1151 | #ifdef CONFIG_FEATURE_TRACEROUTE_SO_DEBUG
|
---|
| 1152 | if (op & USAGE_OP_DEBUG)
|
---|
| 1153 | (void)setsockopt(sndsock, SOL_SOCKET, SO_DEBUG, (char *)&on,
|
---|
| 1154 | sizeof(on));
|
---|
| 1155 | #endif
|
---|
| 1156 | if (op & USAGE_OP_BYPASS_ROUTE)
|
---|
| 1157 | (void)setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE, (char *)&on,
|
---|
| 1158 | sizeof(on));
|
---|
| 1159 |
|
---|
| 1160 | /* Revert to non-privileged user after opening sockets */
|
---|
| 1161 | xsetgid(getgid());
|
---|
| 1162 | xsetuid(getuid());
|
---|
| 1163 |
|
---|
| 1164 | outip = (struct ip *)xcalloc(1, (unsigned)packlen);
|
---|
| 1165 |
|
---|
| 1166 | outip->ip_v = IPVERSION;
|
---|
| 1167 | if (tos_str)
|
---|
| 1168 | outip->ip_tos = tos;
|
---|
| 1169 | outip->ip_len = htons(packlen);
|
---|
| 1170 | outip->ip_off = htons(off);
|
---|
| 1171 | outp = (unsigned char *)(outip + 1);
|
---|
| 1172 | outip->ip_dst = to->sin_addr;
|
---|
| 1173 |
|
---|
| 1174 | outip->ip_hl = (outp - (unsigned char *)outip) >> 2;
|
---|
| 1175 | ident = (getpid() & 0xffff) | 0x8000;
|
---|
| 1176 | #ifdef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
|
---|
| 1177 | if (useicmp) {
|
---|
| 1178 | outip->ip_p = IPPROTO_ICMP;
|
---|
| 1179 |
|
---|
| 1180 | outicmp = (struct icmp *)outp;
|
---|
| 1181 | outicmp->icmp_type = ICMP_ECHO;
|
---|
| 1182 | outicmp->icmp_id = htons(ident);
|
---|
| 1183 |
|
---|
| 1184 | outdata = (struct outdata *)(outp + 8); /* XXX magic number */
|
---|
| 1185 | } else
|
---|
| 1186 | #endif
|
---|
| 1187 | {
|
---|
| 1188 | outip->ip_p = IPPROTO_UDP;
|
---|
| 1189 |
|
---|
| 1190 | outudp = (struct udphdr *)outp;
|
---|
| 1191 | outudp->source = htons(ident);
|
---|
| 1192 | outudp->len =
|
---|
| 1193 | htons((u_short)(packlen - (sizeof(*outip) + optlen)));
|
---|
| 1194 | outdata = (struct outdata *)(outudp + 1);
|
---|
| 1195 | }
|
---|
| 1196 |
|
---|
| 1197 | /* Get the interface address list */
|
---|
| 1198 | n = ifaddrlist(&al);
|
---|
| 1199 |
|
---|
| 1200 | /* Look for a specific device */
|
---|
| 1201 | if (device != NULL) {
|
---|
| 1202 | for (i = n; i > 0; --i, ++al)
|
---|
| 1203 | if (strcmp(device, al->device) == 0)
|
---|
| 1204 | break;
|
---|
| 1205 | if (i <= 0) {
|
---|
| 1206 | bb_error_msg_and_die("Can't find interface %s", device);
|
---|
| 1207 | }
|
---|
| 1208 | }
|
---|
| 1209 |
|
---|
| 1210 | /* Determine our source address */
|
---|
| 1211 | if (source == NULL) {
|
---|
| 1212 | /*
|
---|
| 1213 | * If a device was specified, use the interface address.
|
---|
| 1214 | * Otherwise, try to determine our source address.
|
---|
| 1215 | */
|
---|
| 1216 | if (device != NULL)
|
---|
| 1217 | setsin(from, al->addr);
|
---|
| 1218 | findsaddr(to, from);
|
---|
| 1219 | } else {
|
---|
| 1220 | hi = gethostinfo(source);
|
---|
| 1221 | source = hi->name;
|
---|
| 1222 | hi->name = NULL;
|
---|
| 1223 | /*
|
---|
| 1224 | * If the device was specified make sure it
|
---|
| 1225 | * corresponds to the source address specified.
|
---|
| 1226 | * Otherwise, use the first address (and warn if
|
---|
| 1227 | * there are more than one).
|
---|
| 1228 | */
|
---|
| 1229 | if (device != NULL) {
|
---|
| 1230 | for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
|
---|
| 1231 | if (*ap == al->addr)
|
---|
| 1232 | break;
|
---|
| 1233 | if (i <= 0) {
|
---|
| 1234 | bb_error_msg_and_die(
|
---|
| 1235 | "%s is not on interface %s",
|
---|
| 1236 | source, device);
|
---|
| 1237 | }
|
---|
| 1238 | setsin(from, *ap);
|
---|
| 1239 | } else {
|
---|
| 1240 | setsin(from, hi->addrs[0]);
|
---|
| 1241 | if (hi->n > 1)
|
---|
| 1242 | bb_error_msg(
|
---|
| 1243 | "Warning: %s has multiple addresses; using %s",
|
---|
| 1244 | source, inet_ntoa(from->sin_addr));
|
---|
| 1245 | }
|
---|
| 1246 | freehostinfo(hi);
|
---|
| 1247 | }
|
---|
| 1248 |
|
---|
| 1249 | outip->ip_src = from->sin_addr;
|
---|
| 1250 | #ifndef IP_HDRINCL
|
---|
| 1251 | bb_xbind(sndsock, (struct sockaddr *)from, sizeof(*from));
|
---|
| 1252 | #endif
|
---|
| 1253 |
|
---|
| 1254 | fprintf(stderr, "traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr));
|
---|
| 1255 | if (source)
|
---|
| 1256 | fprintf(stderr, " from %s", source);
|
---|
| 1257 | fprintf(stderr, ", %d hops max, %d byte packets\n", max_ttl, packlen);
|
---|
| 1258 | (void)fflush(stderr);
|
---|
| 1259 |
|
---|
| 1260 | for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
---|
| 1261 | u_int32_t lastaddr = 0;
|
---|
| 1262 | int gotlastaddr = 0;
|
---|
| 1263 | int got_there = 0;
|
---|
| 1264 | int unreachable = 0;
|
---|
| 1265 | int sentfirst = 0;
|
---|
| 1266 |
|
---|
| 1267 | printf("%2d ", ttl);
|
---|
| 1268 | for (probe = 0; probe < nprobes; ++probe) {
|
---|
| 1269 | int cc;
|
---|
| 1270 | struct timeval t1, t2;
|
---|
| 1271 | struct timezone tz;
|
---|
| 1272 | struct ip *ip;
|
---|
| 1273 |
|
---|
| 1274 | if (sentfirst && pausemsecs > 0)
|
---|
| 1275 | usleep(pausemsecs * 1000);
|
---|
| 1276 | (void)gettimeofday(&t1, &tz);
|
---|
| 1277 | send_probe(++seq, ttl, &t1);
|
---|
| 1278 | ++sentfirst;
|
---|
| 1279 | while ((cc = wait_for_reply(s, from, &t1)) != 0) {
|
---|
| 1280 | (void)gettimeofday(&t2, &tz);
|
---|
| 1281 | i = packet_ok(packet, cc, from, seq);
|
---|
| 1282 | /* Skip short packet */
|
---|
| 1283 | if (i == 0)
|
---|
| 1284 | continue;
|
---|
| 1285 | if (!gotlastaddr ||
|
---|
| 1286 | from->sin_addr.s_addr != lastaddr) {
|
---|
| 1287 | print(packet, cc, from);
|
---|
| 1288 | lastaddr = from->sin_addr.s_addr;
|
---|
| 1289 | ++gotlastaddr;
|
---|
| 1290 | }
|
---|
| 1291 | printf(" %.3f ms", deltaT(&t1, &t2));
|
---|
| 1292 | ip = (struct ip *)packet;
|
---|
| 1293 | if (op & USAGE_OP_TTL_FLAG)
|
---|
| 1294 | printf(" (%d)", ip->ip_ttl);
|
---|
| 1295 | if (i == -2) {
|
---|
| 1296 | if (ip->ip_ttl <= 1)
|
---|
| 1297 | printf(" !");
|
---|
| 1298 | ++got_there;
|
---|
| 1299 | break;
|
---|
| 1300 | }
|
---|
| 1301 | /* time exceeded in transit */
|
---|
| 1302 | if (i == -1)
|
---|
| 1303 | break;
|
---|
| 1304 | code = i - 1;
|
---|
| 1305 | switch (code) {
|
---|
| 1306 |
|
---|
| 1307 | case ICMP_UNREACH_PORT:
|
---|
| 1308 | if (ip->ip_ttl <= 1)
|
---|
| 1309 | printf(" !");
|
---|
| 1310 | ++got_there;
|
---|
| 1311 | break;
|
---|
| 1312 |
|
---|
| 1313 | case ICMP_UNREACH_NET:
|
---|
| 1314 | ++unreachable;
|
---|
| 1315 | printf(" !N");
|
---|
| 1316 | break;
|
---|
| 1317 |
|
---|
| 1318 | case ICMP_UNREACH_HOST:
|
---|
| 1319 | ++unreachable;
|
---|
| 1320 | printf(" !H");
|
---|
| 1321 | break;
|
---|
| 1322 |
|
---|
| 1323 | case ICMP_UNREACH_PROTOCOL:
|
---|
| 1324 | ++got_there;
|
---|
| 1325 | printf(" !P");
|
---|
| 1326 | break;
|
---|
| 1327 |
|
---|
| 1328 | case ICMP_UNREACH_NEEDFRAG:
|
---|
| 1329 | ++unreachable;
|
---|
| 1330 | printf(" !F-%d", pmtu);
|
---|
| 1331 | break;
|
---|
| 1332 |
|
---|
| 1333 | case ICMP_UNREACH_SRCFAIL:
|
---|
| 1334 | ++unreachable;
|
---|
| 1335 | printf(" !S");
|
---|
| 1336 | break;
|
---|
| 1337 |
|
---|
| 1338 | case ICMP_UNREACH_FILTER_PROHIB:
|
---|
| 1339 | case ICMP_UNREACH_NET_PROHIB: /* misuse */
|
---|
| 1340 | ++unreachable;
|
---|
| 1341 | printf(" !A");
|
---|
| 1342 | break;
|
---|
| 1343 |
|
---|
| 1344 | case ICMP_UNREACH_HOST_PROHIB:
|
---|
| 1345 | ++unreachable;
|
---|
| 1346 | printf(" !C");
|
---|
| 1347 | break;
|
---|
| 1348 |
|
---|
| 1349 | case ICMP_UNREACH_HOST_PRECEDENCE:
|
---|
| 1350 | ++unreachable;
|
---|
| 1351 | printf(" !V");
|
---|
| 1352 | break;
|
---|
| 1353 |
|
---|
| 1354 | case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
---|
| 1355 | ++unreachable;
|
---|
| 1356 | printf(" !C");
|
---|
| 1357 | break;
|
---|
| 1358 |
|
---|
| 1359 | case ICMP_UNREACH_NET_UNKNOWN:
|
---|
| 1360 | case ICMP_UNREACH_HOST_UNKNOWN:
|
---|
| 1361 | ++unreachable;
|
---|
| 1362 | printf(" !U");
|
---|
| 1363 | break;
|
---|
| 1364 |
|
---|
| 1365 | case ICMP_UNREACH_ISOLATED:
|
---|
| 1366 | ++unreachable;
|
---|
| 1367 | printf(" !I");
|
---|
| 1368 | break;
|
---|
| 1369 |
|
---|
| 1370 | case ICMP_UNREACH_TOSNET:
|
---|
| 1371 | case ICMP_UNREACH_TOSHOST:
|
---|
| 1372 | ++unreachable;
|
---|
| 1373 | printf(" !T");
|
---|
| 1374 | break;
|
---|
| 1375 |
|
---|
| 1376 | default:
|
---|
| 1377 | ++unreachable;
|
---|
| 1378 | printf(" !<%d>", code);
|
---|
| 1379 | break;
|
---|
| 1380 | }
|
---|
| 1381 | break;
|
---|
| 1382 | }
|
---|
| 1383 | if (cc == 0)
|
---|
| 1384 | printf(" *");
|
---|
| 1385 | (void)fflush(stdout);
|
---|
| 1386 | }
|
---|
| 1387 | putchar('\n');
|
---|
| 1388 | if (got_there ||
|
---|
| 1389 | (unreachable > 0 && unreachable >= nprobes - 1))
|
---|
| 1390 | break;
|
---|
| 1391 | }
|
---|
| 1392 | return 0;
|
---|
| 1393 | }
|
---|