[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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[2725] | 25 | /*
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| 26 | * traceroute6
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| 27 | *
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| 28 | * Modified for NRL 4.4BSD IPv6 release.
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| 29 | * 07/31/96 bgp
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| 30 | *
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| 31 | * Modified for Linux IPv6 by Pedro Roque <roque@di.fc.ul.pt>
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| 32 | * 31/07/1996
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| 33 | *
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| 34 | * As ICMP error messages for IPv6 now include more than 8 bytes
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| 35 | * UDP datagrams are now sent via an UDP socket instead of magic
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| 36 | * RAW socket tricks.
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| 37 | *
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| 38 | * Converted to busybox applet by Leonid Lisovskiy <lly@sf.net>
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| 39 | * 2009-11-16
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| 40 | */
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[821] | 41 |
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| 42 | /*
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| 43 | * traceroute host - trace the route ip packets follow going to "host".
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| 44 | *
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| 45 | * Attempt to trace the route an ip packet would follow to some
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| 46 | * internet host. We find out intermediate hops by launching probe
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| 47 | * packets with a small ttl (time to live) then listening for an
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| 48 | * icmp "time exceeded" reply from a gateway. We start our probes
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| 49 | * with a ttl of one and increase by one until we get an icmp "port
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| 50 | * unreachable" (which means we got to "host") or hit a max (which
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| 51 | * defaults to 30 hops & can be changed with the -m flag). Three
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| 52 | * probes (change with -q flag) are sent at each ttl setting and a
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| 53 | * line is printed showing the ttl, address of the gateway and
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| 54 | * round trip time of each probe. If the probe answers come from
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| 55 | * different gateways, the address of each responding system will
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| 56 | * be printed. If there is no response within a 5 sec. timeout
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| 57 | * interval (changed with the -w flag), a "*" is printed for that
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| 58 | * probe.
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| 59 | *
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| 60 | * Probe packets are UDP format. We don't want the destination
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| 61 | * host to process them so the destination port is set to an
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| 62 | * unlikely value (if some clod on the destination is using that
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| 63 | * value, it can be changed with the -p flag).
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| 64 | *
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| 65 | * A sample use might be:
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| 66 | *
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| 67 | * [yak 71]% traceroute nis.nsf.net.
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| 68 | * traceroute to nis.nsf.net (35.1.1.48), 30 hops max, 56 byte packet
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| 69 | * 1 helios.ee.lbl.gov (128.3.112.1) 19 ms 19 ms 0 ms
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| 70 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
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| 71 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 39 ms 19 ms
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| 72 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 39 ms
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| 73 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 39 ms 39 ms 39 ms
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| 74 | * 6 128.32.197.4 (128.32.197.4) 40 ms 59 ms 59 ms
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| 75 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 59 ms
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| 76 | * 8 129.140.70.13 (129.140.70.13) 99 ms 99 ms 80 ms
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| 77 | * 9 129.140.71.6 (129.140.71.6) 139 ms 239 ms 319 ms
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| 78 | * 10 129.140.81.7 (129.140.81.7) 220 ms 199 ms 199 ms
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| 79 | * 11 nic.merit.edu (35.1.1.48) 239 ms 239 ms 239 ms
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| 80 | *
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| 81 | * Note that lines 2 & 3 are the same. This is due to a buggy
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| 82 | * kernel on the 2nd hop system -- lbl-csam.arpa -- that forwards
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| 83 | * packets with a zero ttl.
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| 84 | *
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| 85 | * A more interesting example is:
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| 86 | *
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| 87 | * [yak 72]% traceroute allspice.lcs.mit.edu.
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| 88 | * traceroute to allspice.lcs.mit.edu (18.26.0.115), 30 hops max
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| 89 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
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| 90 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 19 ms 19 ms
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| 91 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 19 ms
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| 92 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 19 ms 39 ms 39 ms
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| 93 | * 5 ccn-nerif22.Berkeley.EDU (128.32.168.22) 20 ms 39 ms 39 ms
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| 94 | * 6 128.32.197.4 (128.32.197.4) 59 ms 119 ms 39 ms
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| 95 | * 7 131.119.2.5 (131.119.2.5) 59 ms 59 ms 39 ms
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| 96 | * 8 129.140.70.13 (129.140.70.13) 80 ms 79 ms 99 ms
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| 97 | * 9 129.140.71.6 (129.140.71.6) 139 ms 139 ms 159 ms
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| 98 | * 10 129.140.81.7 (129.140.81.7) 199 ms 180 ms 300 ms
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| 99 | * 11 129.140.72.17 (129.140.72.17) 300 ms 239 ms 239 ms
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| 100 | * 12 * * *
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| 101 | * 13 128.121.54.72 (128.121.54.72) 259 ms 499 ms 279 ms
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| 102 | * 14 * * *
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| 103 | * 15 * * *
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| 104 | * 16 * * *
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| 105 | * 17 * * *
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| 106 | * 18 ALLSPICE.LCS.MIT.EDU (18.26.0.115) 339 ms 279 ms 279 ms
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| 107 | *
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| 108 | * (I start to see why I'm having so much trouble with mail to
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| 109 | * MIT.) Note that the gateways 12, 14, 15, 16 & 17 hops away
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| 110 | * either don't send ICMP "time exceeded" messages or send them
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| 111 | * with a ttl too small to reach us. 14 - 17 are running the
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| 112 | * MIT C Gateway code that doesn't send "time exceeded"s. God
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| 113 | * only knows what's going on with 12.
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| 114 | *
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| 115 | * The silent gateway 12 in the above may be the result of a bug in
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| 116 | * the 4.[23]BSD network code (and its derivatives): 4.x (x <= 3)
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| 117 | * sends an unreachable message using whatever ttl remains in the
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| 118 | * original datagram. Since, for gateways, the remaining ttl is
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| 119 | * zero, the icmp "time exceeded" is guaranteed to not make it back
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| 120 | * to us. The behavior of this bug is slightly more interesting
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| 121 | * when it appears on the destination system:
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| 122 | *
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| 123 | * 1 helios.ee.lbl.gov (128.3.112.1) 0 ms 0 ms 0 ms
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| 124 | * 2 lilac-dmc.Berkeley.EDU (128.32.216.1) 39 ms 19 ms 39 ms
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| 125 | * 3 lilac-dmc.Berkeley.EDU (128.32.216.1) 19 ms 39 ms 19 ms
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| 126 | * 4 ccngw-ner-cc.Berkeley.EDU (128.32.136.23) 39 ms 40 ms 19 ms
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| 127 | * 5 ccn-nerif35.Berkeley.EDU (128.32.168.35) 39 ms 39 ms 39 ms
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| 128 | * 6 csgw.Berkeley.EDU (128.32.133.254) 39 ms 59 ms 39 ms
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| 129 | * 7 * * *
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| 130 | * 8 * * *
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| 131 | * 9 * * *
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| 132 | * 10 * * *
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| 133 | * 11 * * *
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| 134 | * 12 * * *
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| 135 | * 13 rip.Berkeley.EDU (128.32.131.22) 59 ms ! 39 ms ! 39 ms !
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| 136 | *
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| 137 | * Notice that there are 12 "gateways" (13 is the final
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| 138 | * destination) and exactly the last half of them are "missing".
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| 139 | * What's really happening is that rip (a Sun-3 running Sun OS3.5)
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| 140 | * is using the ttl from our arriving datagram as the ttl in its
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| 141 | * icmp reply. So, the reply will time out on the return path
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| 142 | * (with no notice sent to anyone since icmp's aren't sent for
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| 143 | * icmp's) until we probe with a ttl that's at least twice the path
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| 144 | * length. I.e., rip is really only 7 hops away. A reply that
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| 145 | * returns with a ttl of 1 is a clue this problem exists.
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| 146 | * Traceroute prints a "!" after the time if the ttl is <= 1.
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| 147 | * Since vendors ship a lot of obsolete (DEC's Ultrix, Sun 3.x) or
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| 148 | * non-standard (HPUX) software, expect to see this problem
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| 149 | * frequently and/or take care picking the target host of your
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| 150 | * probes.
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| 151 | *
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| 152 | * Other possible annotations after the time are !H, !N, !P (got a host,
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| 153 | * network or protocol unreachable, respectively), !S or !F (source
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| 154 | * route failed or fragmentation needed -- neither of these should
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| 155 | * ever occur and the associated gateway is busted if you see one). If
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| 156 | * almost all the probes result in some kind of unreachable, traceroute
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| 157 | * will give up and exit.
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| 158 | *
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| 159 | * Notes
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| 160 | * -----
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| 161 | * This program must be run by root or be setuid. (I suggest that
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| 162 | * you *don't* make it setuid -- casual use could result in a lot
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| 163 | * of unnecessary traffic on our poor, congested nets.)
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| 164 | *
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| 165 | * This program requires a kernel mod that does not appear in any
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| 166 | * system available from Berkeley: A raw ip socket using proto
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| 167 | * IPPROTO_RAW must interpret the data sent as an ip datagram (as
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| 168 | * opposed to data to be wrapped in a ip datagram). See the README
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| 169 | * file that came with the source to this program for a description
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| 170 | * of the mods I made to /sys/netinet/raw_ip.c. Your mileage may
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| 171 | * vary. But, again, ANY 4.x (x < 4) BSD KERNEL WILL HAVE TO BE
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| 172 | * MODIFIED TO RUN THIS PROGRAM.
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| 173 | *
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| 174 | * The udp port usage may appear bizarre (well, ok, it is bizarre).
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| 175 | * The problem is that an icmp message only contains 8 bytes of
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| 176 | * data from the original datagram. 8 bytes is the size of a udp
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| 177 | * header so, if we want to associate replies with the original
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| 178 | * datagram, the necessary information must be encoded into the
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| 179 | * udp header (the ip id could be used but there's no way to
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| 180 | * interlock with the kernel's assignment of ip id's and, anyway,
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| 181 | * it would have taken a lot more kernel hacking to allow this
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| 182 | * code to set the ip id). So, to allow two or more users to
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| 183 | * use traceroute simultaneously, we use this task's pid as the
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| 184 | * source port (the high bit is set to move the port number out
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| 185 | * of the "likely" range). To keep track of which probe is being
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| 186 | * replied to (so times and/or hop counts don't get confused by a
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| 187 | * reply that was delayed in transit), we increment the destination
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| 188 | * port number before each probe.
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| 189 | *
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| 190 | * Don't use this as a coding example. I was trying to find a
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| 191 | * routing problem and this code sort-of popped out after 48 hours
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| 192 | * without sleep. I was amazed it ever compiled, much less ran.
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| 193 | *
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| 194 | * I stole the idea for this program from Steve Deering. Since
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| 195 | * the first release, I've learned that had I attended the right
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| 196 | * IETF working group meetings, I also could have stolen it from Guy
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| 197 | * Almes or Matt Mathis. I don't know (or care) who came up with
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| 198 | * the idea first. I envy the originators' perspicacity and I'm
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| 199 | * glad they didn't keep the idea a secret.
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| 200 | *
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| 201 | * Tim Seaver, Ken Adelman and C. Philip Wood provided bug fixes and/or
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| 202 | * enhancements to the original distribution.
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| 203 | *
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| 204 | * I've hacked up a round-trip-route version of this that works by
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| 205 | * sending a loose-source-routed udp datagram through the destination
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| 206 | * back to yourself. Unfortunately, SO many gateways botch source
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| 207 | * routing, the thing is almost worthless. Maybe one day...
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| 208 | *
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| 209 | * -- Van Jacobson (van@ee.lbl.gov)
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| 210 | * Tue Dec 20 03:50:13 PST 1988
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| 211 | */
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| 212 |
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[1765] | 213 | #define TRACEROUTE_SO_DEBUG 0
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| 214 |
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| 215 | /* TODO: undefs were uncommented - ??! we have config system for that! */
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| 216 | /* probably ok to remove altogether */
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| 217 | //#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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[821] | 218 | //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
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[1765] | 219 | //#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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[821] | 220 | //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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[1765] | 221 | //#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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[821] | 222 | //#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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| 223 |
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| 224 |
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| 225 | #include <net/if.h>
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[1765] | 226 | #include <arpa/inet.h>
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[821] | 227 | #include <netinet/in.h>
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| 228 | #include <netinet/udp.h>
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| 229 | #include <netinet/ip.h>
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| 230 | #include <netinet/ip_icmp.h>
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[2725] | 231 | #if ENABLE_FEATURE_IPV6
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| 232 | # include <netinet/ip6.h>
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| 233 | # include <netinet/icmp6.h>
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| 234 | # ifndef SOL_IPV6
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| 235 | # define SOL_IPV6 IPPROTO_IPV6
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| 236 | # endif
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| 237 | #endif
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[821] | 238 |
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[1765] | 239 | #include "libbb.h"
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| 240 | #include "inet_common.h"
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[821] | 241 |
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[1765] | 242 | #ifndef IPPROTO_ICMP
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[2725] | 243 | # define IPPROTO_ICMP 1
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[1765] | 244 | #endif
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| 245 | #ifndef IPPROTO_IP
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[2725] | 246 | # define IPPROTO_IP 0
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[1765] | 247 | #endif
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| 248 |
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[821] | 249 |
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[2725] | 250 | #define OPT_STRING "FIlnrdvxt:i:m:p:q:s:w:z:f:" \
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| 251 | IF_FEATURE_TRACEROUTE_SOURCE_ROUTE("g:") \
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| 252 | "4" IF_TRACEROUTE6("6")
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| 253 | enum {
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| 254 | OPT_DONT_FRAGMNT = (1 << 0), /* F */
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| 255 | OPT_USE_ICMP = (1 << 1) * ENABLE_FEATURE_TRACEROUTE_USE_ICMP, /* I */
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| 256 | OPT_TTL_FLAG = (1 << 2), /* l */
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| 257 | OPT_ADDR_NUM = (1 << 3), /* n */
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| 258 | OPT_BYPASS_ROUTE = (1 << 4), /* r */
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| 259 | OPT_DEBUG = (1 << 5), /* d */
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| 260 | OPT_VERBOSE = (1 << 6) * ENABLE_FEATURE_TRACEROUTE_VERBOSE, /* v */
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| 261 | OPT_IP_CHKSUM = (1 << 7), /* x */
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| 262 | OPT_TOS = (1 << 8), /* t */
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| 263 | OPT_DEVICE = (1 << 9), /* i */
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| 264 | OPT_MAX_TTL = (1 << 10), /* m */
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| 265 | OPT_PORT = (1 << 11), /* p */
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| 266 | OPT_NPROBES = (1 << 12), /* q */
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| 267 | OPT_SOURCE = (1 << 13), /* s */
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| 268 | OPT_WAITTIME = (1 << 14), /* w */
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| 269 | OPT_PAUSE_MS = (1 << 15), /* z */
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| 270 | OPT_FIRST_TTL = (1 << 16), /* f */
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| 271 | OPT_SOURCE_ROUTE = (1 << 17) * ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE, /* g */
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| 272 | OPT_IPV4 = (1 << (17+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)), /* 4 */
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| 273 | OPT_IPV6 = (1 << (18+ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE)) * ENABLE_TRACEROUTE6, /* 6 */
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[821] | 274 | };
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[2725] | 275 | #define verbose (option_mask32 & OPT_VERBOSE)
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[821] | 276 |
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[2725] | 277 | enum {
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| 278 | SIZEOF_ICMP_HDR = 8,
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| 279 | rcvsock = 3, /* receive (icmp) socket file descriptor */
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| 280 | sndsock = 4, /* send (udp/icmp) socket file descriptor */
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[821] | 281 | };
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| 282 |
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| 283 | /* Data section of the probe packet */
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[2725] | 284 | struct outdata_t {
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[821] | 285 | unsigned char seq; /* sequence number of this packet */
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| 286 | unsigned char ttl; /* ttl packet left with */
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[1765] | 287 | // UNUSED. Retaining to have the same packet size.
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[2725] | 288 | struct timeval tv_UNUSED PACKED; /* time packet left */
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[821] | 289 | };
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| 290 |
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[2725] | 291 | #if ENABLE_TRACEROUTE6
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| 292 | struct outdata6_t {
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| 293 | uint32_t ident6;
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| 294 | uint32_t seq6;
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| 295 | struct timeval tv_UNUSED PACKED; /* time packet left */
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[821] | 296 | };
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| 297 | #endif
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| 298 |
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[2725] | 299 | struct globals {
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| 300 | struct ip *outip;
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| 301 | struct outdata_t *outdata;
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| 302 | len_and_sockaddr *dest_lsa;
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| 303 | int packlen; /* total length of packet */
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| 304 | int pmtu; /* Path MTU Discovery (RFC1191) */
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| 305 | uint32_t ident;
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| 306 | uint16_t port; // 32768 + 666; /* start udp dest port # for probe packets */
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| 307 | int waittime; // 5; /* time to wait for response (in seconds) */
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[1765] | 308 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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[2725] | 309 | int optlen; /* length of ip options */
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[821] | 310 | #else
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| 311 | #define optlen 0
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| 312 | #endif
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[2725] | 313 | unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
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[1765] | 314 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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| 315 | /* Maximum number of gateways (include room for one noop) */
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| 316 | #define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
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| 317 | /* loose source route gateway list (including room for final destination) */
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| 318 | uint32_t gwlist[NGATEWAYS + 1];
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| 319 | #endif
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| 320 | };
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| 321 |
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| 322 | #define G (*ptr_to_globals)
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[2725] | 323 | #define outip (G.outip )
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| 324 | #define outdata (G.outdata )
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| 325 | #define dest_lsa (G.dest_lsa )
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| 326 | #define packlen (G.packlen )
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| 327 | #define pmtu (G.pmtu )
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| 328 | #define ident (G.ident )
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| 329 | #define port (G.port )
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| 330 | #define waittime (G.waittime )
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| 331 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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| 332 | # define optlen (G.optlen )
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| 333 | #endif
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| 334 | #define recv_pkt (G.recv_pkt )
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[1765] | 335 | #define gwlist (G.gwlist )
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[2725] | 336 | #define INIT_G() do { \
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| 337 | SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
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| 338 | port = 32768 + 666; \
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| 339 | waittime = 5; \
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| 340 | } while (0)
|
---|
[1765] | 341 |
|
---|
[2725] | 342 | #define outicmp ((struct icmp *)(outip + 1))
|
---|
| 343 | #define outudp ((struct udphdr *)(outip + 1))
|
---|
[1765] | 344 |
|
---|
| 345 |
|
---|
[2725] | 346 | /* libbb candidate? tftp uses this idiom too */
|
---|
| 347 | static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa)
|
---|
[821] | 348 | {
|
---|
[2725] | 349 | len_and_sockaddr *new_lsa = xzalloc(LSA_LEN_SIZE + lsa->len);
|
---|
| 350 | memcpy(new_lsa, lsa, LSA_LEN_SIZE + lsa->len);
|
---|
| 351 | return new_lsa;
|
---|
[821] | 352 | }
|
---|
| 353 |
|
---|
| 354 |
|
---|
[2725] | 355 | static int
|
---|
| 356 | wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to)
|
---|
[821] | 357 | {
|
---|
[2725] | 358 | struct pollfd pfd[1];
|
---|
| 359 | int read_len = 0;
|
---|
[821] | 360 |
|
---|
[2725] | 361 | pfd[0].fd = rcvsock;
|
---|
| 362 | pfd[0].events = POLLIN;
|
---|
| 363 | if (safe_poll(pfd, 1, waittime * 1000) > 0) {
|
---|
| 364 | read_len = recv_from_to(rcvsock,
|
---|
| 365 | recv_pkt, sizeof(recv_pkt),
|
---|
| 366 | /*flags:*/ 0,
|
---|
| 367 | &from_lsa->u.sa, to, from_lsa->len);
|
---|
[821] | 368 | }
|
---|
| 369 |
|
---|
[2725] | 370 | return read_len;
|
---|
[821] | 371 | }
|
---|
| 372 |
|
---|
| 373 | /*
|
---|
| 374 | * Checksum routine for Internet Protocol family headers (C Version)
|
---|
| 375 | */
|
---|
[1765] | 376 | static uint16_t
|
---|
| 377 | in_cksum(uint16_t *addr, int len)
|
---|
[821] | 378 | {
|
---|
| 379 | int nleft = len;
|
---|
[1765] | 380 | uint16_t *w = addr;
|
---|
| 381 | uint16_t answer;
|
---|
[821] | 382 | int sum = 0;
|
---|
| 383 |
|
---|
| 384 | /*
|
---|
[2725] | 385 | * Our algorithm is simple, using a 32 bit accumulator (sum),
|
---|
| 386 | * we add sequential 16 bit words to it, and at the end, fold
|
---|
| 387 | * back all the carry bits from the top 16 bits into the lower
|
---|
| 388 | * 16 bits.
|
---|
[821] | 389 | */
|
---|
[2725] | 390 | while (nleft > 1) {
|
---|
[821] | 391 | sum += *w++;
|
---|
| 392 | nleft -= 2;
|
---|
| 393 | }
|
---|
| 394 |
|
---|
| 395 | /* mop up an odd byte, if necessary */
|
---|
| 396 | if (nleft == 1)
|
---|
| 397 | sum += *(unsigned char *)w;
|
---|
| 398 |
|
---|
[2725] | 399 | /* add back carry outs from top 16 bits to low 16 bits */
|
---|
[821] | 400 | sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
|
---|
| 401 | sum += (sum >> 16); /* add carry */
|
---|
| 402 | answer = ~sum; /* truncate to 16 bits */
|
---|
| 403 | return answer;
|
---|
| 404 | }
|
---|
| 405 |
|
---|
| 406 | static void
|
---|
[1765] | 407 | send_probe(int seq, int ttl)
|
---|
[821] | 408 | {
|
---|
[2725] | 409 | int len, res;
|
---|
| 410 | void *out;
|
---|
[821] | 411 |
|
---|
| 412 | /* Payload */
|
---|
[2725] | 413 | #if ENABLE_TRACEROUTE6
|
---|
| 414 | if (dest_lsa->u.sa.sa_family == AF_INET6) {
|
---|
| 415 | struct outdata6_t *pkt = (struct outdata6_t *) outip;
|
---|
| 416 | pkt->ident6 = htonl(ident);
|
---|
| 417 | pkt->seq6 = htonl(seq);
|
---|
| 418 | /*gettimeofday(&pkt->tv, &tz);*/
|
---|
| 419 | } else
|
---|
| 420 | #endif
|
---|
| 421 | {
|
---|
| 422 | outdata->seq = seq;
|
---|
| 423 | outdata->ttl = ttl;
|
---|
[1765] | 424 | // UNUSED: was storing gettimeofday's result there, but never ever checked it
|
---|
[2725] | 425 | /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
|
---|
[821] | 426 |
|
---|
[2725] | 427 | if (option_mask32 & OPT_USE_ICMP) {
|
---|
| 428 | outicmp->icmp_seq = htons(seq);
|
---|
[821] | 429 |
|
---|
[2725] | 430 | /* Always calculate checksum for icmp packets */
|
---|
| 431 | outicmp->icmp_cksum = 0;
|
---|
| 432 | outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
|
---|
| 433 | packlen - (sizeof(*outip) + optlen));
|
---|
| 434 | if (outicmp->icmp_cksum == 0)
|
---|
| 435 | outicmp->icmp_cksum = 0xffff;
|
---|
| 436 | }
|
---|
[821] | 437 | }
|
---|
| 438 |
|
---|
[2725] | 439 | //BUG! verbose is (x & OPT_VERBOSE), not a counter!
|
---|
| 440 | #if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
[821] | 441 | /* XXX undocumented debugging hack */
|
---|
| 442 | if (verbose > 1) {
|
---|
[1765] | 443 | const uint16_t *sp;
|
---|
[821] | 444 | int nshorts, i;
|
---|
| 445 |
|
---|
[1765] | 446 | sp = (uint16_t *)outip;
|
---|
| 447 | nshorts = (unsigned)packlen / sizeof(uint16_t);
|
---|
[821] | 448 | i = 0;
|
---|
| 449 | printf("[ %d bytes", packlen);
|
---|
| 450 | while (--nshorts >= 0) {
|
---|
| 451 | if ((i++ % 8) == 0)
|
---|
| 452 | printf("\n\t");
|
---|
| 453 | printf(" %04x", ntohs(*sp));
|
---|
| 454 | sp++;
|
---|
| 455 | }
|
---|
| 456 | if (packlen & 1) {
|
---|
| 457 | if ((i % 8) == 0)
|
---|
| 458 | printf("\n\t");
|
---|
| 459 | printf(" %02x", *(unsigned char *)sp);
|
---|
| 460 | }
|
---|
| 461 | printf("]\n");
|
---|
| 462 | }
|
---|
| 463 | #endif
|
---|
| 464 |
|
---|
[2725] | 465 | #if ENABLE_TRACEROUTE6
|
---|
| 466 | if (dest_lsa->u.sa.sa_family == AF_INET6) {
|
---|
| 467 | res = setsockopt(sndsock, SOL_IPV6, IPV6_UNICAST_HOPS, &ttl, sizeof(ttl));
|
---|
| 468 | if (res < 0)
|
---|
| 469 | bb_perror_msg_and_die("setsockopt UNICAST_HOPS %d", ttl);
|
---|
| 470 | out = outip;
|
---|
| 471 | len = packlen;
|
---|
| 472 | } else
|
---|
| 473 | #endif
|
---|
| 474 | {
|
---|
| 475 | #if defined IP_TTL
|
---|
| 476 | res = setsockopt(sndsock, IPPROTO_IP, IP_TTL, &ttl, sizeof(ttl));
|
---|
| 477 | if (res < 0)
|
---|
| 478 | bb_perror_msg_and_die("setsockopt ttl %d", ttl);
|
---|
| 479 | #endif
|
---|
| 480 | out = outicmp;
|
---|
| 481 | len = packlen - sizeof(*outip);
|
---|
| 482 | if (!(option_mask32 & OPT_USE_ICMP)) {
|
---|
| 483 | out = outdata;
|
---|
| 484 | len -= sizeof(*outudp);
|
---|
| 485 | set_nport(dest_lsa, htons(port + seq));
|
---|
| 486 | }
|
---|
[821] | 487 | }
|
---|
| 488 |
|
---|
[2725] | 489 | res = xsendto(sndsock, out, len, &dest_lsa->u.sa, dest_lsa->len);
|
---|
| 490 | if (res != len)
|
---|
| 491 | bb_info_msg("sent %d octets, ret=%d", len, res);
|
---|
[821] | 492 | }
|
---|
| 493 |
|
---|
[1765] | 494 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
[821] | 495 | /*
|
---|
| 496 | * Convert an ICMP "type" field to a printable string.
|
---|
| 497 | */
|
---|
[2725] | 498 | static const char *
|
---|
[821] | 499 | pr_type(unsigned char t)
|
---|
| 500 | {
|
---|
[1765] | 501 | static const char *const ttab[] = {
|
---|
[821] | 502 | "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
|
---|
| 503 | "Source Quench", "Redirect", "ICMP 6", "ICMP 7",
|
---|
| 504 | "Echo", "Router Advert", "Router Solicit", "Time Exceeded",
|
---|
| 505 | "Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
|
---|
| 506 | "Info Reply", "Mask Request", "Mask Reply"
|
---|
| 507 | };
|
---|
[2725] | 508 | # if ENABLE_TRACEROUTE6
|
---|
| 509 | static const char *const ttab6[] = {
|
---|
| 510 | [0] "Error", "Dest Unreachable", "Packet Too Big", "Time Exceeded",
|
---|
| 511 | [4] "Param Problem",
|
---|
| 512 | [8] "Echo Request", "Echo Reply", "Membership Query", "Membership Report",
|
---|
| 513 | [12] "Membership Reduction", "Router Solicit", "Router Advert", "Neighbor Solicit",
|
---|
| 514 | [16] "Neighbor Advert", "Redirect",
|
---|
| 515 | };
|
---|
[821] | 516 |
|
---|
[2725] | 517 | if (dest_lsa->u.sa.sa_family == AF_INET6) {
|
---|
| 518 | if (t < 5)
|
---|
| 519 | return ttab6[t];
|
---|
| 520 | if (t < 128 || t > ND_REDIRECT)
|
---|
| 521 | return "OUT-OF-RANGE";
|
---|
| 522 | return ttab6[(t & 63) + 8];
|
---|
| 523 | }
|
---|
| 524 | # endif
|
---|
| 525 | if (t >= ARRAY_SIZE(ttab))
|
---|
[821] | 526 | return "OUT-OF-RANGE";
|
---|
| 527 |
|
---|
| 528 | return ttab[t];
|
---|
| 529 | }
|
---|
| 530 | #endif
|
---|
| 531 |
|
---|
[2725] | 532 | #if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 533 | #define packet4_ok(read_len, from, seq) \
|
---|
| 534 | packet4_ok(read_len, seq)
|
---|
| 535 | #endif
|
---|
[821] | 536 | static int
|
---|
[2725] | 537 | packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
|
---|
[821] | 538 | {
|
---|
[2725] | 539 | const struct icmp *icp;
|
---|
[821] | 540 | unsigned char type, code;
|
---|
| 541 | int hlen;
|
---|
[2725] | 542 | const struct ip *ip;
|
---|
[821] | 543 |
|
---|
[2725] | 544 | ip = (struct ip *) recv_pkt;
|
---|
[821] | 545 | hlen = ip->ip_hl << 2;
|
---|
[2725] | 546 | if (read_len < hlen + ICMP_MINLEN) {
|
---|
[1765] | 547 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
[821] | 548 | if (verbose)
|
---|
[2725] | 549 | printf("packet too short (%d bytes) from %s\n", read_len,
|
---|
[821] | 550 | inet_ntoa(from->sin_addr));
|
---|
| 551 | #endif
|
---|
| 552 | return 0;
|
---|
| 553 | }
|
---|
[2725] | 554 | read_len -= hlen;
|
---|
| 555 | icp = (struct icmp *)(recv_pkt + hlen);
|
---|
[821] | 556 | type = icp->icmp_type;
|
---|
| 557 | code = icp->icmp_code;
|
---|
| 558 | /* Path MTU Discovery (RFC1191) */
|
---|
[2725] | 559 | pmtu = 0;
|
---|
| 560 | if (code == ICMP_UNREACH_NEEDFRAG)
|
---|
[821] | 561 | pmtu = ntohs(icp->icmp_nextmtu);
|
---|
| 562 |
|
---|
[2725] | 563 | if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS)
|
---|
| 564 | || type == ICMP_UNREACH
|
---|
| 565 | || type == ICMP_ECHOREPLY
|
---|
| 566 | ) {
|
---|
| 567 | const struct ip *hip;
|
---|
| 568 | const struct udphdr *up;
|
---|
| 569 |
|
---|
[821] | 570 | hip = &icp->icmp_ip;
|
---|
| 571 | hlen = hip->ip_hl << 2;
|
---|
[2725] | 572 | if (option_mask32 & OPT_USE_ICMP) {
|
---|
[821] | 573 | struct icmp *hicmp;
|
---|
| 574 |
|
---|
| 575 | /* XXX */
|
---|
[2725] | 576 | if (type == ICMP_ECHOREPLY
|
---|
| 577 | && icp->icmp_id == htons(ident)
|
---|
| 578 | && icp->icmp_seq == htons(seq)
|
---|
| 579 | ) {
|
---|
| 580 | return ICMP_UNREACH_PORT+1;
|
---|
| 581 | }
|
---|
[821] | 582 |
|
---|
| 583 | hicmp = (struct icmp *)((unsigned char *)hip + hlen);
|
---|
[2725] | 584 | if (hlen + SIZEOF_ICMP_HDR <= read_len
|
---|
| 585 | && hip->ip_p == IPPROTO_ICMP
|
---|
| 586 | && hicmp->icmp_id == htons(ident)
|
---|
| 587 | && hicmp->icmp_seq == htons(seq)
|
---|
| 588 | ) {
|
---|
[821] | 589 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
[2725] | 590 | }
|
---|
| 591 | } else {
|
---|
| 592 | up = (struct udphdr *)((char *)hip + hlen);
|
---|
| 593 | if (hlen + 12 <= read_len
|
---|
| 594 | && hip->ip_p == IPPROTO_UDP
|
---|
| 595 | // Off: since we do not form the entire IP packet,
|
---|
| 596 | // but defer it to kernel, we can't set source port,
|
---|
| 597 | // and thus can't check it here in the reply
|
---|
| 598 | /* && up->source == htons(ident) */
|
---|
| 599 | && up->dest == htons(port + seq)
|
---|
| 600 | ) {
|
---|
[821] | 601 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
[2725] | 602 | }
|
---|
[821] | 603 | }
|
---|
| 604 | }
|
---|
[1765] | 605 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
[821] | 606 | if (verbose) {
|
---|
| 607 | int i;
|
---|
[1765] | 608 | uint32_t *lp = (uint32_t *)&icp->icmp_ip;
|
---|
[821] | 609 |
|
---|
| 610 | printf("\n%d bytes from %s to "
|
---|
| 611 | "%s: icmp type %d (%s) code %d\n",
|
---|
[2725] | 612 | read_len, inet_ntoa(from->sin_addr),
|
---|
| 613 | inet_ntoa(ip->ip_dst),
|
---|
| 614 | type, pr_type(type), icp->icmp_code);
|
---|
| 615 | for (i = 4; i < read_len; i += sizeof(*lp))
|
---|
[821] | 616 | printf("%2d: x%8.8x\n", i, *lp++);
|
---|
| 617 | }
|
---|
| 618 | #endif
|
---|
| 619 | return 0;
|
---|
| 620 | }
|
---|
| 621 |
|
---|
[2725] | 622 | #if ENABLE_TRACEROUTE6
|
---|
| 623 | # if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 624 | #define packet_ok(read_len, from_lsa, to, seq) \
|
---|
| 625 | packet_ok(read_len, from_lsa, seq)
|
---|
| 626 | # endif
|
---|
| 627 | static int
|
---|
| 628 | packet_ok(int read_len, len_and_sockaddr *from_lsa,
|
---|
| 629 | struct sockaddr *to,
|
---|
| 630 | int seq)
|
---|
[821] | 631 | {
|
---|
[2725] | 632 | const struct icmp6_hdr *icp;
|
---|
| 633 | unsigned char type, code;
|
---|
[821] | 634 |
|
---|
[2725] | 635 | if (from_lsa->u.sa.sa_family == AF_INET)
|
---|
| 636 | return packet4_ok(read_len, &from_lsa->u.sin, seq);
|
---|
[821] | 637 |
|
---|
[2725] | 638 | icp = (struct icmp6_hdr *) recv_pkt;
|
---|
[821] | 639 |
|
---|
[2725] | 640 | type = icp->icmp6_type;
|
---|
| 641 | code = icp->icmp6_code;
|
---|
[821] | 642 |
|
---|
[2725] | 643 | if ((type == ICMP6_TIME_EXCEEDED && code == ICMP6_TIME_EXCEED_TRANSIT)
|
---|
| 644 | || type == ICMP6_DST_UNREACH
|
---|
| 645 | ) {
|
---|
| 646 | struct ip6_hdr *hip;
|
---|
| 647 | struct udphdr *up;
|
---|
| 648 | int nexthdr;
|
---|
[821] | 649 |
|
---|
[2725] | 650 | hip = (struct ip6_hdr *)(icp + 1);
|
---|
| 651 | up = (struct udphdr *) (hip + 1);
|
---|
| 652 | nexthdr = hip->ip6_nxt;
|
---|
[821] | 653 |
|
---|
[2725] | 654 | if (nexthdr == IPPROTO_FRAGMENT) {
|
---|
| 655 | nexthdr = *(unsigned char*)up;
|
---|
| 656 | up++;
|
---|
| 657 | }
|
---|
| 658 | if (nexthdr == IPPROTO_UDP) {
|
---|
| 659 | struct outdata6_t *pkt;
|
---|
[821] | 660 |
|
---|
[2725] | 661 | pkt = (struct outdata6_t *) (up + 1);
|
---|
| 662 |
|
---|
| 663 | if (ntohl(pkt->ident6) == ident
|
---|
| 664 | && ntohl(pkt->seq6) == seq
|
---|
| 665 | ) {
|
---|
| 666 | return (type == ICMP6_TIME_EXCEEDED ? -1 : (code<<8)+1);
|
---|
| 667 | }
|
---|
| 668 | }
|
---|
[821] | 669 | }
|
---|
| 670 |
|
---|
[2725] | 671 | # if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
| 672 | if (verbose) {
|
---|
| 673 | unsigned char *p;
|
---|
| 674 | char pa1[MAXHOSTNAMELEN];
|
---|
| 675 | char pa2[MAXHOSTNAMELEN];
|
---|
| 676 | int i;
|
---|
| 677 |
|
---|
| 678 | p = (unsigned char *) (icp + 1);
|
---|
| 679 |
|
---|
| 680 | printf("\n%d bytes from %s to "
|
---|
| 681 | "%s: icmp type %d (%s) code %d\n",
|
---|
| 682 | read_len,
|
---|
| 683 | inet_ntop(AF_INET6, &from_lsa->u.sin6.sin6_addr, pa1, sizeof(pa1)),
|
---|
| 684 | inet_ntop(AF_INET6, &((struct sockaddr_in6*)to)->sin6_addr, pa2, sizeof(pa2)),
|
---|
| 685 | type, pr_type(type), icp->icmp6_code);
|
---|
| 686 |
|
---|
| 687 | read_len -= sizeof(struct icmp6_hdr);
|
---|
| 688 | for (i = 0; i < read_len ; i++) {
|
---|
| 689 | if (i % 16 == 0)
|
---|
| 690 | printf("%04x:", i);
|
---|
| 691 | if (i % 4 == 0)
|
---|
| 692 | bb_putchar(' ');
|
---|
| 693 | printf("%02x", p[i]);
|
---|
| 694 | if ((i % 16 == 15) && (i + 1 < read_len))
|
---|
| 695 | bb_putchar('\n');
|
---|
| 696 | }
|
---|
| 697 | bb_putchar('\n');
|
---|
| 698 | }
|
---|
| 699 | # endif
|
---|
| 700 |
|
---|
| 701 | return 0;
|
---|
[821] | 702 | }
|
---|
[2725] | 703 | #else /* !ENABLE_TRACEROUTE6 */
|
---|
| 704 | static ALWAYS_INLINE int
|
---|
| 705 | packet_ok(int read_len,
|
---|
| 706 | len_and_sockaddr *from_lsa IF_NOT_FEATURE_TRACEROUTE_VERBOSE(UNUSED_PARAM),
|
---|
| 707 | struct sockaddr *to UNUSED_PARAM,
|
---|
| 708 | int seq)
|
---|
| 709 | {
|
---|
| 710 | return packet4_ok(read_len, &from_lsa->u.sin, seq);
|
---|
| 711 | }
|
---|
| 712 | #endif
|
---|
[821] | 713 |
|
---|
[2725] | 714 | /*
|
---|
| 715 | * Construct an Internet address representation.
|
---|
| 716 | * If the -n flag has been supplied, give
|
---|
| 717 | * numeric value, otherwise try for symbolic name.
|
---|
| 718 | */
|
---|
[821] | 719 | static void
|
---|
[2725] | 720 | print_inetname(const struct sockaddr *from)
|
---|
[821] | 721 | {
|
---|
[2725] | 722 | char *ina = xmalloc_sockaddr2dotted_noport(from);
|
---|
| 723 |
|
---|
| 724 | if (option_mask32 & OPT_ADDR_NUM) {
|
---|
| 725 | printf(" %s", ina);
|
---|
| 726 | } else {
|
---|
| 727 | char *n = NULL;
|
---|
| 728 |
|
---|
| 729 | if (from->sa_family != AF_INET
|
---|
| 730 | || ((struct sockaddr_in*)from)->sin_addr.s_addr != INADDR_ANY
|
---|
| 731 | ) {
|
---|
| 732 | /* Try to reverse resolve if it is not 0.0.0.0 */
|
---|
| 733 | n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
|
---|
| 734 | }
|
---|
| 735 | printf(" %s (%s)", (n ? n : ina), ina);
|
---|
| 736 | free(n);
|
---|
| 737 | }
|
---|
| 738 | free(ina);
|
---|
[821] | 739 | }
|
---|
| 740 |
|
---|
| 741 | static void
|
---|
[2725] | 742 | print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
|
---|
[821] | 743 | {
|
---|
[2725] | 744 | print_inetname(from);
|
---|
[821] | 745 |
|
---|
[2725] | 746 | if (verbose) {
|
---|
| 747 | char *ina = xmalloc_sockaddr2dotted_noport(to);
|
---|
| 748 | #if ENABLE_TRACEROUTE6
|
---|
| 749 | if (to->sa_family == AF_INET6) {
|
---|
| 750 | read_len -= sizeof(struct ip6_hdr);
|
---|
| 751 | } else
|
---|
| 752 | #endif
|
---|
| 753 | {
|
---|
| 754 | read_len -= ((struct ip*)recv_pkt)->ip_hl << 2;
|
---|
| 755 | }
|
---|
| 756 | printf(" %d bytes to %s", read_len, ina);
|
---|
| 757 | free(ina);
|
---|
| 758 | }
|
---|
[821] | 759 | }
|
---|
| 760 |
|
---|
[1765] | 761 | static void
|
---|
| 762 | print_delta_ms(unsigned t1p, unsigned t2p)
|
---|
| 763 | {
|
---|
| 764 | unsigned tt = t2p - t1p;
|
---|
[2725] | 765 | printf(" %u.%03u ms", tt / 1000, tt % 1000);
|
---|
[1765] | 766 | }
|
---|
[821] | 767 |
|
---|
[2725] | 768 | /*
|
---|
| 769 | * Usage: [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]
|
---|
| 770 | * [-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]
|
---|
| 771 | * [-w waittime] [-z pausemsecs] host [packetlen]"
|
---|
| 772 | */
|
---|
| 773 | static int
|
---|
| 774 | common_traceroute_main(int op, char **argv)
|
---|
[821] | 775 | {
|
---|
[2725] | 776 | int i;
|
---|
| 777 | int minpacket;
|
---|
[821] | 778 | int tos = 0;
|
---|
[2725] | 779 | int max_ttl = 30;
|
---|
| 780 | int nprobes = 3;
|
---|
| 781 | int first_ttl = 1;
|
---|
| 782 | unsigned pausemsecs = 0;
|
---|
[1765] | 783 | char *source;
|
---|
| 784 | char *device;
|
---|
[2725] | 785 | char *tos_str;
|
---|
[1765] | 786 | char *max_ttl_str;
|
---|
| 787 | char *port_str;
|
---|
| 788 | char *nprobes_str;
|
---|
| 789 | char *waittime_str;
|
---|
| 790 | char *pausemsecs_str;
|
---|
| 791 | char *first_ttl_str;
|
---|
| 792 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 793 | llist_t *source_route_list = NULL;
|
---|
[2725] | 794 | int lsrr = 0;
|
---|
[821] | 795 | #endif
|
---|
[2725] | 796 | #if ENABLE_TRACEROUTE6
|
---|
| 797 | sa_family_t af;
|
---|
[821] | 798 | #else
|
---|
[2725] | 799 | enum { af = AF_INET };
|
---|
[821] | 800 | #endif
|
---|
[2725] | 801 | int ttl;
|
---|
| 802 | int seq;
|
---|
| 803 | len_and_sockaddr *from_lsa;
|
---|
| 804 | struct sockaddr *lastaddr;
|
---|
| 805 | struct sockaddr *to;
|
---|
[821] | 806 |
|
---|
[2725] | 807 | INIT_G();
|
---|
| 808 |
|
---|
| 809 | /* minimum 1 arg */
|
---|
| 810 | opt_complementary = "-1:x-x" IF_FEATURE_TRACEROUTE_SOURCE_ROUTE(":g::");
|
---|
| 811 | op |= getopt32(argv, OPT_STRING
|
---|
[1765] | 812 | , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
|
---|
| 813 | , &source, &waittime_str, &pausemsecs_str, &first_ttl_str
|
---|
| 814 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 815 | , &source_route_list
|
---|
[821] | 816 | #endif
|
---|
| 817 | );
|
---|
[2725] | 818 | argv += optind;
|
---|
[821] | 819 |
|
---|
[2725] | 820 | #if 0 /* IGNORED */
|
---|
| 821 | if (op & OPT_IP_CHKSUM)
|
---|
[1765] | 822 | bb_error_msg("warning: ip checksums disabled");
|
---|
[2725] | 823 | #endif
|
---|
[1765] | 824 | if (op & OPT_TOS)
|
---|
| 825 | tos = xatou_range(tos_str, 0, 255);
|
---|
| 826 | if (op & OPT_MAX_TTL)
|
---|
| 827 | max_ttl = xatou_range(max_ttl_str, 1, 255);
|
---|
| 828 | if (op & OPT_PORT)
|
---|
| 829 | port = xatou16(port_str);
|
---|
| 830 | if (op & OPT_NPROBES)
|
---|
| 831 | nprobes = xatou_range(nprobes_str, 1, INT_MAX);
|
---|
| 832 | if (op & OPT_SOURCE) {
|
---|
| 833 | /*
|
---|
| 834 | * set the ip source address of the outbound
|
---|
| 835 | * probe (e.g., on a multi-homed host).
|
---|
| 836 | */
|
---|
[2725] | 837 | if (getuid() != 0)
|
---|
| 838 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
[821] | 839 | }
|
---|
[1765] | 840 | if (op & OPT_WAITTIME)
|
---|
[2725] | 841 | waittime = xatou_range(waittime_str, 1, 24 * 60 * 60);
|
---|
[1765] | 842 | if (op & OPT_PAUSE_MS)
|
---|
| 843 | pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
|
---|
| 844 | if (op & OPT_FIRST_TTL)
|
---|
[2725] | 845 | first_ttl = xatou_range(first_ttl_str, 1, max_ttl);
|
---|
[821] | 846 |
|
---|
[1765] | 847 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
| 848 | if (source_route_list) {
|
---|
[2725] | 849 | while (source_route_list) {
|
---|
| 850 | len_and_sockaddr *lsa;
|
---|
[821] | 851 |
|
---|
| 852 | if (lsrr >= NGATEWAYS)
|
---|
[1765] | 853 | bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
|
---|
[2725] | 854 | lsa = xhost_and_af2sockaddr(llist_pop(&source_route_list), 0, AF_INET);
|
---|
| 855 | gwlist[lsrr] = lsa->u.sin.sin_addr.s_addr;
|
---|
| 856 | free(lsa);
|
---|
[821] | 857 | ++lsrr;
|
---|
| 858 | }
|
---|
| 859 | optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
---|
| 860 | }
|
---|
| 861 | #endif
|
---|
| 862 |
|
---|
[2725] | 863 | /* Process destination and optional packet size */
|
---|
| 864 | minpacket = sizeof(*outip) + SIZEOF_ICMP_HDR + sizeof(*outdata) + optlen;
|
---|
| 865 | if (!(op & OPT_USE_ICMP))
|
---|
| 866 | minpacket += sizeof(*outudp) - SIZEOF_ICMP_HDR;
|
---|
| 867 | #if ENABLE_TRACEROUTE6
|
---|
| 868 | af = AF_UNSPEC;
|
---|
| 869 | if (op & OPT_IPV4)
|
---|
| 870 | af = AF_INET;
|
---|
| 871 | if (op & OPT_IPV6)
|
---|
| 872 | af = AF_INET6;
|
---|
| 873 | dest_lsa = xhost_and_af2sockaddr(argv[0], port, af);
|
---|
| 874 | af = dest_lsa->u.sa.sa_family;
|
---|
| 875 | if (af == AF_INET6)
|
---|
| 876 | minpacket = sizeof(struct outdata6_t);
|
---|
| 877 | #else
|
---|
| 878 | dest_lsa = xhost2sockaddr(argv[0], port);
|
---|
[821] | 879 | #endif
|
---|
[2725] | 880 | packlen = minpacket;
|
---|
| 881 | if (argv[1])
|
---|
| 882 | packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
|
---|
[821] | 883 |
|
---|
[1765] | 884 | /* Ensure the socket fds won't be 0, 1 or 2 */
|
---|
| 885 | bb_sanitize_stdio();
|
---|
[821] | 886 |
|
---|
[2725] | 887 | #if ENABLE_TRACEROUTE6
|
---|
| 888 | if (af == AF_INET6) {
|
---|
| 889 | xmove_fd(xsocket(AF_INET6, SOCK_RAW, IPPROTO_ICMPV6), rcvsock);
|
---|
| 890 | # ifdef IPV6_RECVPKTINFO
|
---|
| 891 | setsockopt(rcvsock, SOL_IPV6, IPV6_RECVPKTINFO,
|
---|
| 892 | &const_int_1, sizeof(const_int_1));
|
---|
| 893 | setsockopt(rcvsock, SOL_IPV6, IPV6_2292PKTINFO,
|
---|
| 894 | &const_int_1, sizeof(const_int_1));
|
---|
| 895 | # else
|
---|
| 896 | setsockopt(rcvsock, SOL_IPV6, IPV6_PKTINFO,
|
---|
| 897 | &const_int_1, sizeof(const_int_1));
|
---|
| 898 | # endif
|
---|
| 899 | } else
|
---|
| 900 | #endif
|
---|
| 901 | {
|
---|
| 902 | xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), rcvsock);
|
---|
| 903 | }
|
---|
[821] | 904 |
|
---|
[1765] | 905 | #if TRACEROUTE_SO_DEBUG
|
---|
| 906 | if (op & OPT_DEBUG)
|
---|
[2725] | 907 | setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
|
---|
[1765] | 908 | &const_int_1, sizeof(const_int_1));
|
---|
[821] | 909 | #endif
|
---|
[1765] | 910 | if (op & OPT_BYPASS_ROUTE)
|
---|
[2725] | 911 | setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
|
---|
[1765] | 912 | &const_int_1, sizeof(const_int_1));
|
---|
[821] | 913 |
|
---|
[2725] | 914 | #if ENABLE_TRACEROUTE6
|
---|
| 915 | if (af == AF_INET6) {
|
---|
| 916 | static const int two = 2;
|
---|
| 917 | if (setsockopt(rcvsock, SOL_RAW, IPV6_CHECKSUM, &two, sizeof(two)) < 0)
|
---|
| 918 | bb_perror_msg_and_die("setsockopt RAW_CHECKSUM");
|
---|
| 919 | xmove_fd(xsocket(af, SOCK_DGRAM, 0), sndsock);
|
---|
| 920 | } else
|
---|
| 921 | #endif
|
---|
| 922 | {
|
---|
| 923 | if (op & OPT_USE_ICMP)
|
---|
| 924 | xmove_fd(xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP), sndsock);
|
---|
| 925 | else
|
---|
| 926 | xmove_fd(xsocket(AF_INET, SOCK_DGRAM, 0), sndsock);
|
---|
| 927 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE && defined IP_OPTIONS
|
---|
| 928 | if (lsrr > 0) {
|
---|
| 929 | unsigned char optlist[MAX_IPOPTLEN];
|
---|
[821] | 930 |
|
---|
[2725] | 931 | /* final hop */
|
---|
| 932 | gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
|
---|
| 933 | ++lsrr;
|
---|
[821] | 934 |
|
---|
[2725] | 935 | /* force 4 byte alignment */
|
---|
| 936 | optlist[0] = IPOPT_NOP;
|
---|
| 937 | /* loose source route option */
|
---|
| 938 | optlist[1] = IPOPT_LSRR;
|
---|
| 939 | i = lsrr * sizeof(gwlist[0]);
|
---|
| 940 | optlist[2] = i + 3;
|
---|
| 941 | /* pointer to LSRR addresses */
|
---|
| 942 | optlist[3] = IPOPT_MINOFF;
|
---|
| 943 | memcpy(optlist + 4, gwlist, i);
|
---|
[821] | 944 |
|
---|
[2725] | 945 | if (setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
|
---|
| 946 | (char *)optlist, i + sizeof(gwlist[0])) < 0) {
|
---|
| 947 | bb_perror_msg_and_die("IP_OPTIONS");
|
---|
| 948 | }
|
---|
[1765] | 949 | }
|
---|
[2725] | 950 | #endif
|
---|
[821] | 951 | }
|
---|
| 952 |
|
---|
| 953 | #ifdef SO_SNDBUF
|
---|
[1765] | 954 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
|
---|
[821] | 955 | bb_perror_msg_and_die("SO_SNDBUF");
|
---|
| 956 | }
|
---|
| 957 | #endif
|
---|
| 958 | #ifdef IP_TOS
|
---|
[2725] | 959 | if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
|
---|
[821] | 960 | bb_perror_msg_and_die("setsockopt tos %d", tos);
|
---|
| 961 | }
|
---|
| 962 | #endif
|
---|
[2725] | 963 | #ifdef IP_DONTFRAG
|
---|
| 964 | if (op & OPT_DONT_FRAGMNT)
|
---|
| 965 | setsockopt(sndsock, IPPROTO_IP, IP_DONTFRAG,
|
---|
| 966 | &const_int_1, sizeof(const_int_1));
|
---|
[821] | 967 | #endif
|
---|
[1765] | 968 | #if TRACEROUTE_SO_DEBUG
|
---|
| 969 | if (op & OPT_DEBUG)
|
---|
| 970 | setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
|
---|
| 971 | &const_int_1, sizeof(const_int_1));
|
---|
[821] | 972 | #endif
|
---|
[1765] | 973 | if (op & OPT_BYPASS_ROUTE)
|
---|
| 974 | setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
|
---|
| 975 | &const_int_1, sizeof(const_int_1));
|
---|
[821] | 976 |
|
---|
[1765] | 977 | outip = xzalloc(packlen);
|
---|
[821] | 978 |
|
---|
[2725] | 979 | ident = getpid();
|
---|
[821] | 980 |
|
---|
[2725] | 981 | if (af == AF_INET) {
|
---|
| 982 | if (op & OPT_USE_ICMP) {
|
---|
| 983 | ident |= 0x8000;
|
---|
| 984 | outicmp->icmp_type = ICMP_ECHO;
|
---|
| 985 | outicmp->icmp_id = htons(ident);
|
---|
| 986 | outdata = (struct outdata_t *)((char *)outicmp + SIZEOF_ICMP_HDR);
|
---|
| 987 | } else {
|
---|
| 988 | outdata = (struct outdata_t *)(outudp + 1);
|
---|
| 989 | }
|
---|
[821] | 990 | }
|
---|
| 991 |
|
---|
[2725] | 992 | if (op & OPT_DEVICE) /* hmm, do we need error check? */
|
---|
| 993 | setsockopt_bindtodevice(sndsock, device);
|
---|
[821] | 994 |
|
---|
[2725] | 995 | if (op & OPT_SOURCE) {
|
---|
| 996 | #if ENABLE_TRACEROUTE6
|
---|
| 997 | // TODO: need xdotted_and_af2sockaddr?
|
---|
| 998 | len_and_sockaddr *source_lsa = xhost_and_af2sockaddr(source, 0, af);
|
---|
| 999 | #else
|
---|
| 1000 | len_and_sockaddr *source_lsa = xdotted2sockaddr(source, 0);
|
---|
| 1001 | #endif
|
---|
| 1002 | /* Ping4 does this (why?) */
|
---|
| 1003 | if (af == AF_INET)
|
---|
| 1004 | if (setsockopt(sndsock, IPPROTO_IP, IP_MULTICAST_IF,
|
---|
| 1005 | &source_lsa->u.sa, source_lsa->len))
|
---|
| 1006 | bb_error_msg_and_die("can't set multicast source interface");
|
---|
| 1007 | //TODO: we can query source port we bound to,
|
---|
| 1008 | // and check it in replies... if we care enough
|
---|
| 1009 | xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
|
---|
| 1010 | free(source_lsa);
|
---|
[821] | 1011 | }
|
---|
[2725] | 1012 | #if ENABLE_TRACEROUTE6
|
---|
| 1013 | else if (af == AF_INET6) {
|
---|
| 1014 | //TODO: why we don't do it for IPv4?
|
---|
| 1015 | len_and_sockaddr *source_lsa;
|
---|
[821] | 1016 |
|
---|
[2725] | 1017 | int probe_fd = xsocket(af, SOCK_DGRAM, 0);
|
---|
[1765] | 1018 | if (op & OPT_DEVICE)
|
---|
[2725] | 1019 | setsockopt_bindtodevice(probe_fd, device);
|
---|
| 1020 | set_nport(dest_lsa, htons(1025));
|
---|
| 1021 | /* dummy connect. makes kernel pick source IP (and port) */
|
---|
| 1022 | xconnect(probe_fd, &dest_lsa->u.sa, dest_lsa->len);
|
---|
| 1023 | set_nport(dest_lsa, htons(port));
|
---|
| 1024 |
|
---|
| 1025 | /* read IP and port */
|
---|
| 1026 | source_lsa = get_sock_lsa(probe_fd);
|
---|
| 1027 | if (source_lsa == NULL)
|
---|
| 1028 | bb_error_msg_and_die("can't get probe addr");
|
---|
| 1029 |
|
---|
| 1030 | close(probe_fd);
|
---|
| 1031 |
|
---|
| 1032 | /* bind our sockets to this IP (but not port) */
|
---|
| 1033 | set_nport(source_lsa, 0);
|
---|
| 1034 | xbind(sndsock, &source_lsa->u.sa, source_lsa->len);
|
---|
| 1035 | xbind(rcvsock, &source_lsa->u.sa, source_lsa->len);
|
---|
| 1036 |
|
---|
| 1037 | free(source_lsa);
|
---|
[821] | 1038 | }
|
---|
| 1039 | #endif
|
---|
| 1040 |
|
---|
[2725] | 1041 | /* Revert to non-privileged user after opening sockets */
|
---|
| 1042 | xsetgid(getgid());
|
---|
| 1043 | xsetuid(getuid());
|
---|
| 1044 |
|
---|
| 1045 | printf("traceroute to %s (%s)", argv[0],
|
---|
| 1046 | xmalloc_sockaddr2dotted_noport(&dest_lsa->u.sa));
|
---|
[1765] | 1047 | if (op & OPT_SOURCE)
|
---|
| 1048 | printf(" from %s", source);
|
---|
| 1049 | printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
|
---|
[821] | 1050 |
|
---|
[2725] | 1051 | from_lsa = dup_sockaddr(dest_lsa);
|
---|
| 1052 | lastaddr = xzalloc(dest_lsa->len);
|
---|
| 1053 | to = xzalloc(dest_lsa->len);
|
---|
| 1054 | seq = 0;
|
---|
[821] | 1055 | for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
---|
[2725] | 1056 | int probe;
|
---|
| 1057 | int unreachable = 0; /* counter */
|
---|
| 1058 | int gotlastaddr = 0; /* flags */
|
---|
[821] | 1059 | int got_there = 0;
|
---|
[2725] | 1060 | int first = 1;
|
---|
[821] | 1061 |
|
---|
[2725] | 1062 | printf("%2d", ttl);
|
---|
[821] | 1063 | for (probe = 0; probe < nprobes; ++probe) {
|
---|
[2725] | 1064 | int read_len;
|
---|
[1765] | 1065 | unsigned t1;
|
---|
| 1066 | unsigned t2;
|
---|
[821] | 1067 | struct ip *ip;
|
---|
| 1068 |
|
---|
[2725] | 1069 | if (!first && pausemsecs > 0)
|
---|
[821] | 1070 | usleep(pausemsecs * 1000);
|
---|
[2725] | 1071 | fflush_all();
|
---|
| 1072 |
|
---|
[1765] | 1073 | t1 = monotonic_us();
|
---|
| 1074 | send_probe(++seq, ttl);
|
---|
[2725] | 1075 |
|
---|
| 1076 | first = 0;
|
---|
| 1077 | while ((read_len = wait_for_reply(from_lsa, to)) != 0) {
|
---|
[1765] | 1078 | t2 = monotonic_us();
|
---|
[2725] | 1079 | i = packet_ok(read_len, from_lsa, to, seq);
|
---|
[821] | 1080 | /* Skip short packet */
|
---|
| 1081 | if (i == 0)
|
---|
| 1082 | continue;
|
---|
[2725] | 1083 |
|
---|
| 1084 | if (!gotlastaddr
|
---|
| 1085 | || (memcmp(lastaddr, &from_lsa->u.sa, from_lsa->len) != 0)
|
---|
| 1086 | ) {
|
---|
| 1087 | print(read_len, &from_lsa->u.sa, to);
|
---|
| 1088 | memcpy(lastaddr, &from_lsa->u.sa, from_lsa->len);
|
---|
| 1089 | gotlastaddr = 1;
|
---|
[821] | 1090 | }
|
---|
[2725] | 1091 |
|
---|
[1765] | 1092 | print_delta_ms(t1, t2);
|
---|
[2725] | 1093 | ip = (struct ip *)recv_pkt;
|
---|
| 1094 |
|
---|
| 1095 | if (from_lsa->u.sa.sa_family == AF_INET)
|
---|
| 1096 | if (op & OPT_TTL_FLAG)
|
---|
| 1097 | printf(" (%d)", ip->ip_ttl);
|
---|
| 1098 |
|
---|
[821] | 1099 | /* time exceeded in transit */
|
---|
| 1100 | if (i == -1)
|
---|
| 1101 | break;
|
---|
[2725] | 1102 | i--;
|
---|
| 1103 | switch (i) {
|
---|
| 1104 | #if ENABLE_TRACEROUTE6
|
---|
| 1105 | case ICMP6_DST_UNREACH_NOPORT << 8:
|
---|
| 1106 | got_there = 1;
|
---|
| 1107 | break;
|
---|
| 1108 | #endif
|
---|
[821] | 1109 | case ICMP_UNREACH_PORT:
|
---|
| 1110 | if (ip->ip_ttl <= 1)
|
---|
| 1111 | printf(" !");
|
---|
[2725] | 1112 | got_there = 1;
|
---|
[821] | 1113 | break;
|
---|
| 1114 |
|
---|
| 1115 | case ICMP_UNREACH_NET:
|
---|
[2725] | 1116 | #if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET)
|
---|
| 1117 | case ICMP6_DST_UNREACH_NOROUTE << 8:
|
---|
| 1118 | #endif
|
---|
| 1119 | printf(" !N");
|
---|
[821] | 1120 | ++unreachable;
|
---|
| 1121 | break;
|
---|
| 1122 | case ICMP_UNREACH_HOST:
|
---|
[2725] | 1123 | #if ENABLE_TRACEROUTE6
|
---|
| 1124 | case ICMP6_DST_UNREACH_ADDR << 8:
|
---|
| 1125 | #endif
|
---|
| 1126 | printf(" !H");
|
---|
[821] | 1127 | ++unreachable;
|
---|
| 1128 | break;
|
---|
| 1129 | case ICMP_UNREACH_PROTOCOL:
|
---|
| 1130 | printf(" !P");
|
---|
[2725] | 1131 | got_there = 1;
|
---|
[821] | 1132 | break;
|
---|
| 1133 | case ICMP_UNREACH_NEEDFRAG:
|
---|
[2725] | 1134 | printf(" !F-%d", pmtu);
|
---|
[821] | 1135 | ++unreachable;
|
---|
| 1136 | break;
|
---|
| 1137 | case ICMP_UNREACH_SRCFAIL:
|
---|
[2725] | 1138 | #if ENABLE_TRACEROUTE6
|
---|
| 1139 | case ICMP6_DST_UNREACH_ADMIN << 8:
|
---|
| 1140 | #endif
|
---|
| 1141 | printf(" !S");
|
---|
[821] | 1142 | ++unreachable;
|
---|
| 1143 | break;
|
---|
| 1144 | case ICMP_UNREACH_FILTER_PROHIB:
|
---|
| 1145 | case ICMP_UNREACH_NET_PROHIB: /* misuse */
|
---|
[2725] | 1146 | printf(" !A");
|
---|
[821] | 1147 | ++unreachable;
|
---|
| 1148 | break;
|
---|
| 1149 | case ICMP_UNREACH_HOST_PROHIB:
|
---|
[2725] | 1150 | printf(" !C");
|
---|
[821] | 1151 | ++unreachable;
|
---|
| 1152 | break;
|
---|
| 1153 | case ICMP_UNREACH_HOST_PRECEDENCE:
|
---|
[2725] | 1154 | printf(" !V");
|
---|
[821] | 1155 | ++unreachable;
|
---|
| 1156 | break;
|
---|
| 1157 | case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
---|
[2725] | 1158 | printf(" !C");
|
---|
[821] | 1159 | ++unreachable;
|
---|
| 1160 | break;
|
---|
| 1161 | case ICMP_UNREACH_NET_UNKNOWN:
|
---|
| 1162 | case ICMP_UNREACH_HOST_UNKNOWN:
|
---|
[2725] | 1163 | printf(" !U");
|
---|
[821] | 1164 | ++unreachable;
|
---|
| 1165 | break;
|
---|
| 1166 | case ICMP_UNREACH_ISOLATED:
|
---|
[2725] | 1167 | printf(" !I");
|
---|
[821] | 1168 | ++unreachable;
|
---|
| 1169 | break;
|
---|
| 1170 | case ICMP_UNREACH_TOSNET:
|
---|
| 1171 | case ICMP_UNREACH_TOSHOST:
|
---|
[2725] | 1172 | printf(" !T");
|
---|
[821] | 1173 | ++unreachable;
|
---|
| 1174 | break;
|
---|
| 1175 | default:
|
---|
[2725] | 1176 | printf(" !<%d>", i);
|
---|
[821] | 1177 | ++unreachable;
|
---|
| 1178 | break;
|
---|
| 1179 | }
|
---|
| 1180 | break;
|
---|
| 1181 | }
|
---|
[2725] | 1182 | /* there was no packet at all? */
|
---|
| 1183 | if (read_len == 0)
|
---|
| 1184 | printf(" *");
|
---|
[821] | 1185 | }
|
---|
[2725] | 1186 | bb_putchar('\n');
|
---|
| 1187 | if (got_there
|
---|
| 1188 | || (unreachable > 0 && unreachable >= nprobes - 1)
|
---|
| 1189 | ) {
|
---|
[821] | 1190 | break;
|
---|
[2725] | 1191 | }
|
---|
[821] | 1192 | }
|
---|
[2725] | 1193 |
|
---|
[821] | 1194 | return 0;
|
---|
| 1195 | }
|
---|
[2725] | 1196 |
|
---|
| 1197 | int traceroute_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1198 | int traceroute_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 1199 | {
|
---|
| 1200 | return common_traceroute_main(0, argv);
|
---|
| 1201 | }
|
---|
| 1202 |
|
---|
| 1203 | #if ENABLE_TRACEROUTE6
|
---|
| 1204 | int traceroute6_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
| 1205 | int traceroute6_main(int argc UNUSED_PARAM, char **argv)
|
---|
| 1206 | {
|
---|
| 1207 | return common_traceroute_main(OPT_IPV6, argv);
|
---|
| 1208 | }
|
---|
| 1209 | #endif
|
---|