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 | #define TRACEROUTE_SO_DEBUG 0
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200 |
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201 | /* TODO: undefs were uncommented - ??! we have config system for that! */
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202 | /* probably ok to remove altogether */
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203 | //#undef CONFIG_FEATURE_TRACEROUTE_VERBOSE
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204 | //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
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205 | //#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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206 | //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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207 | //#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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208 | //#define CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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209 |
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210 |
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211 | #include <net/if.h>
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212 | #include <arpa/inet.h>
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213 | #include <netinet/in.h>
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214 | #include <netinet/udp.h>
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215 | #include <netinet/ip.h>
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216 | #include <netinet/ip_icmp.h>
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217 |
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218 | #include "libbb.h"
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219 | #include "inet_common.h"
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220 |
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221 |
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222 | /*
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223 | * Definitions for internet protocol version 4.
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224 | * Per RFC 791, September 1981.
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225 | */
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226 | #define IPVERSION 4
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227 |
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228 | #ifndef IPPROTO_ICMP
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229 | /* Grrrr.... */
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230 | #define IPPROTO_ICMP 1
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231 | #endif
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232 | #ifndef IPPROTO_IP
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233 | #define IPPROTO_IP 0
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234 | #endif
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235 |
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236 | /*
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237 | * Overlay for ip header used by other protocols (tcp, udp).
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238 | */
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239 | struct ipovly {
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240 | unsigned char ih_x1[9]; /* (unused) */
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241 | unsigned char ih_pr; /* protocol */
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242 | short ih_len; /* protocol length */
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243 | struct in_addr ih_src; /* source internet address */
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244 | struct in_addr ih_dst; /* destination internet address */
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245 | };
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246 |
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247 | /*
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248 | * UDP kernel structures and variables.
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249 | */
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250 | struct udpiphdr {
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251 | struct ipovly ui_i; /* overlaid ip structure */
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252 | struct udphdr ui_u; /* udp header */
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253 | };
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254 | #define ui_next ui_i.ih_next
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255 | #define ui_prev ui_i.ih_prev
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256 | #define ui_x1 ui_i.ih_x1
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257 | #define ui_pr ui_i.ih_pr
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258 | #define ui_len ui_i.ih_len
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259 | #define ui_src ui_i.ih_src
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260 | #define ui_dst ui_i.ih_dst
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261 | #define ui_sport ui_u.uh_sport
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262 | #define ui_dport ui_u.uh_dport
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263 | #define ui_ulen ui_u.uh_ulen
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264 | #define ui_sum ui_u.uh_sum
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265 |
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266 |
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267 | /* Host name and address list */
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268 | struct hostinfo {
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269 | char *name;
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270 | int n;
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271 | uint32_t *addrs;
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272 | };
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273 |
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274 | /* Data section of the probe packet */
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275 | struct outdata {
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276 | unsigned char seq; /* sequence number of this packet */
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277 | unsigned char ttl; /* ttl packet left with */
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278 | // UNUSED. Retaining to have the same packet size.
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279 | struct timeval tv_UNUSED ATTRIBUTE_PACKED; /* time packet left */
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280 | };
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281 |
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282 | struct IFADDRLIST {
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283 | uint32_t addr;
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284 | char device[sizeof(struct ifreq)];
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285 | };
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286 |
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287 |
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288 | static struct ip *outip; /* last output (udp) packet */
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289 | static struct udphdr *outudp; /* last output (udp) packet */
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290 | static struct outdata *outdata; /* last output (udp) packet */
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291 |
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292 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
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293 | static struct icmp *outicmp; /* last output (icmp) packet */
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294 | #endif
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295 |
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296 | static int s; /* receive (icmp) socket file descriptor */
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297 | static int sndsock; /* send (udp/icmp) socket file descriptor */
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298 |
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299 | static int packlen; /* total length of packet */
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300 | static int minpacket; /* min ip packet size */
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301 | static int maxpacket = 32 * 1024; /* max ip packet size */
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302 | static int pmtu; /* Path MTU Discovery (RFC1191) */
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303 |
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304 | static char *hostname;
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305 |
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306 | static uint16_t ident;
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307 | static uint16_t port = 32768 + 666; /* start udp dest port # for probe packets */
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308 |
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309 | static int waittime = 5; /* time to wait for response (in seconds) */
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310 | static int doipcksum = 1; /* calculate ip checksums by default */
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311 |
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312 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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313 | static int optlen; /* length of ip options */
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314 | #else
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315 | #define optlen 0
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316 | #endif
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317 |
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318 |
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319 | /* Keep in sync with getopt32 call! */
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320 | #define OPT_DONT_FRAGMNT (1<<0) /* F */
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321 | #define OPT_USE_ICMP (1<<1) /* I */
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322 | #define OPT_TTL_FLAG (1<<2) /* l */
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323 | #define OPT_ADDR_NUM (1<<3) /* n */
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324 | #define OPT_BYPASS_ROUTE (1<<4) /* r */
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325 | #define OPT_DEBUG (1<<5) /* d */
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326 | #define OPT_VERBOSE (1<<6) /* v */
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327 | #define OPT_IP_CHKSUM (1<<7) /* x */
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328 | #define OPT_TOS (1<<8) /* t */
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329 | #define OPT_DEVICE (1<<9) /* i */
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330 | #define OPT_MAX_TTL (1<<10) /* m */
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331 | #define OPT_PORT (1<<11) /* p */
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332 | #define OPT_NPROBES (1<<12) /* q */
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333 | #define OPT_SOURCE (1<<13) /* s */
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334 | #define OPT_WAITTIME (1<<14) /* w */
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335 | #define OPT_PAUSE_MS (1<<15) /* z */
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336 | #define OPT_FIRST_TTL (1<<16) /* f */
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337 |
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338 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
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339 | /* use icmp echo instead of udp packets */
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340 | #define useicmp (option_mask32 & OPT_USE_ICMP)
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341 | #endif
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342 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
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343 | #define verbose (option_mask32 & OPT_VERBOSE)
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344 | #endif
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345 | #define nflag (option_mask32 & OPT_ADDR_NUM)
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346 |
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347 |
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348 | struct globals {
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349 | /* last inbound (icmp) packet */
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350 | unsigned char packet[512];
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351 | struct sockaddr_storage whereto; /* Who to try to reach */
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352 | struct sockaddr_storage wherefrom; /* Who we are */
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353 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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354 | /* Maximum number of gateways (include room for one noop) */
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355 | #define NGATEWAYS ((int)((MAX_IPOPTLEN - IPOPT_MINOFF - 1) / sizeof(uint32_t)))
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356 | /* loose source route gateway list (including room for final destination) */
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357 | uint32_t gwlist[NGATEWAYS + 1];
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358 | #endif
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359 | };
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360 |
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361 | #define G (*ptr_to_globals)
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362 |
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363 | #define packet (G.packet )
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364 | #define whereto (G.whereto )
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365 | #define wherefrom (G.wherefrom)
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366 | #define gwlist (G.gwlist )
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367 |
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368 |
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369 | /*
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370 | * Return the interface list
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371 | */
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372 | static int
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373 | ifaddrlist(struct IFADDRLIST **ipaddrp)
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374 | {
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375 | enum { IFREQ_BUFSIZE = (32 * 1024) / sizeof(struct ifreq) };
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376 |
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377 | int fd, nipaddr;
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378 | #ifdef HAVE_SOCKADDR_SA_LEN
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379 | int n;
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380 | #endif
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381 | struct ifreq *ifrp, *ifend, *ifnext;
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382 | struct sockaddr_in *addr_sin;
|
---|
383 | struct IFADDRLIST *al;
|
---|
384 | struct ifconf ifc;
|
---|
385 | struct ifreq ifr;
|
---|
386 | /* Was on stack, but 32k is a bit too much: */
|
---|
387 | struct ifreq *ibuf = xmalloc(IFREQ_BUFSIZE * sizeof(ibuf[0]));
|
---|
388 | struct IFADDRLIST *st_ifaddrlist;
|
---|
389 |
|
---|
390 | fd = xsocket(AF_INET, SOCK_DGRAM, 0);
|
---|
391 |
|
---|
392 | ifc.ifc_len = IFREQ_BUFSIZE * sizeof(ibuf[0]);
|
---|
393 | ifc.ifc_buf = (caddr_t)ibuf;
|
---|
394 |
|
---|
395 | if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0
|
---|
396 | || ifc.ifc_len < sizeof(struct ifreq)
|
---|
397 | ) {
|
---|
398 | if (errno == EINVAL)
|
---|
399 | bb_error_msg_and_die(
|
---|
400 | "SIOCGIFCONF: ifreq struct too small (%u bytes)",
|
---|
401 | (unsigned)(IFREQ_BUFSIZE * sizeof(ibuf[0])));
|
---|
402 | bb_perror_msg_and_die("SIOCGIFCONF");
|
---|
403 | }
|
---|
404 | ifrp = ibuf;
|
---|
405 | ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
|
---|
406 |
|
---|
407 | nipaddr = 1 + (ifc.ifc_len / sizeof(struct ifreq));
|
---|
408 | st_ifaddrlist = xzalloc(nipaddr * sizeof(struct IFADDRLIST));
|
---|
409 | al = st_ifaddrlist;
|
---|
410 | nipaddr = 0;
|
---|
411 |
|
---|
412 | for (; ifrp < ifend; ifrp = ifnext) {
|
---|
413 | #ifdef HAVE_SOCKADDR_SA_LEN
|
---|
414 | n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
|
---|
415 | if (n < sizeof(*ifrp))
|
---|
416 | ifnext = ifrp + 1;
|
---|
417 | else
|
---|
418 | ifnext = (struct ifreq *)((char *)ifrp + n);
|
---|
419 | if (ifrp->ifr_addr.sa_family != AF_INET)
|
---|
420 | continue;
|
---|
421 | #else
|
---|
422 | ifnext = ifrp + 1;
|
---|
423 | #endif
|
---|
424 | /*
|
---|
425 | * Need a template to preserve address info that is
|
---|
426 | * used below to locate the next entry. (Otherwise,
|
---|
427 | * SIOCGIFFLAGS stomps over it because the requests
|
---|
428 | * are returned in a union.)
|
---|
429 | */
|
---|
430 | strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
|
---|
431 | if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
|
---|
432 | if (errno == ENXIO)
|
---|
433 | continue;
|
---|
434 | bb_perror_msg_and_die("SIOCGIFFLAGS: %.*s",
|
---|
435 | (int)sizeof(ifr.ifr_name), ifr.ifr_name);
|
---|
436 | }
|
---|
437 |
|
---|
438 | /* Must be up */
|
---|
439 | if ((ifr.ifr_flags & IFF_UP) == 0)
|
---|
440 | continue;
|
---|
441 |
|
---|
442 | safe_strncpy(al->device, ifr.ifr_name, sizeof(ifr.ifr_name) + 1);
|
---|
443 | #ifdef sun
|
---|
444 | /* Ignore sun virtual interfaces */
|
---|
445 | if (strchr(al->device, ':') != NULL)
|
---|
446 | continue;
|
---|
447 | #endif
|
---|
448 | ioctl_or_perror_and_die(fd, SIOCGIFADDR, (char *)&ifr,
|
---|
449 | "SIOCGIFADDR: %s", al->device);
|
---|
450 |
|
---|
451 | addr_sin = (struct sockaddr_in *)&ifr.ifr_addr;
|
---|
452 | al->addr = addr_sin->sin_addr.s_addr;
|
---|
453 | ++al;
|
---|
454 | ++nipaddr;
|
---|
455 | }
|
---|
456 | if (nipaddr == 0)
|
---|
457 | bb_error_msg_and_die("can't find any network interfaces");
|
---|
458 |
|
---|
459 | free(ibuf);
|
---|
460 | close(fd);
|
---|
461 | *ipaddrp = st_ifaddrlist;
|
---|
462 | return nipaddr;
|
---|
463 | }
|
---|
464 |
|
---|
465 |
|
---|
466 | static void
|
---|
467 | setsin(struct sockaddr_in *addr_sin, uint32_t addr)
|
---|
468 | {
|
---|
469 | memset(addr_sin, 0, sizeof(*addr_sin));
|
---|
470 | #ifdef HAVE_SOCKADDR_SA_LEN
|
---|
471 | addr_sin->sin_len = sizeof(*addr_sin);
|
---|
472 | #endif
|
---|
473 | addr_sin->sin_family = AF_INET;
|
---|
474 | addr_sin->sin_addr.s_addr = addr;
|
---|
475 | }
|
---|
476 |
|
---|
477 |
|
---|
478 | /*
|
---|
479 | * Return the source address for the given destination address
|
---|
480 | */
|
---|
481 | static void
|
---|
482 | findsaddr(const struct sockaddr_in *to, struct sockaddr_in *from)
|
---|
483 | {
|
---|
484 | int i, n;
|
---|
485 | FILE *f;
|
---|
486 | uint32_t mask;
|
---|
487 | uint32_t dest, tmask;
|
---|
488 | struct IFADDRLIST *al;
|
---|
489 | char buf[256], tdevice[256], device[256];
|
---|
490 |
|
---|
491 | f = xfopen("/proc/net/route", "r");
|
---|
492 |
|
---|
493 | /* Find the appropriate interface */
|
---|
494 | n = 0;
|
---|
495 | mask = 0;
|
---|
496 | device[0] = '\0';
|
---|
497 | while (fgets(buf, sizeof(buf), f) != NULL) {
|
---|
498 | ++n;
|
---|
499 | if (n == 1 && strncmp(buf, "Iface", 5) == 0)
|
---|
500 | continue;
|
---|
501 | i = sscanf(buf, "%255s %x %*s %*s %*s %*s %*s %x",
|
---|
502 | tdevice, &dest, &tmask);
|
---|
503 | if (i != 3)
|
---|
504 | bb_error_msg_and_die("junk in buffer");
|
---|
505 | if ((to->sin_addr.s_addr & tmask) == dest
|
---|
506 | && (tmask > mask || mask == 0)
|
---|
507 | ) {
|
---|
508 | mask = tmask;
|
---|
509 | strcpy(device, tdevice);
|
---|
510 | }
|
---|
511 | }
|
---|
512 | fclose(f);
|
---|
513 |
|
---|
514 | if (device[0] == '\0')
|
---|
515 | bb_error_msg_and_die("can't find interface");
|
---|
516 |
|
---|
517 | /* Get the interface address list */
|
---|
518 | n = ifaddrlist(&al);
|
---|
519 |
|
---|
520 | /* Find our appropriate source address */
|
---|
521 | for (i = n; i > 0; --i, ++al)
|
---|
522 | if (strcmp(device, al->device) == 0)
|
---|
523 | break;
|
---|
524 | if (i <= 0)
|
---|
525 | bb_error_msg_and_die("can't find interface %s", device);
|
---|
526 |
|
---|
527 | setsin(from, al->addr);
|
---|
528 | }
|
---|
529 |
|
---|
530 | /*
|
---|
531 | "Usage: %s [-dFIlnrvx] [-g gateway] [-i iface] [-f first_ttl]\n"
|
---|
532 | "\t[-m max_ttl] [ -p port] [-q nqueries] [-s src_addr] [-t tos]\n"
|
---|
533 | "\t[-w waittime] [-z pausemsecs] host [packetlen]"
|
---|
534 |
|
---|
535 | */
|
---|
536 |
|
---|
537 | static int
|
---|
538 | wait_for_reply(int sock, struct sockaddr_in *fromp)
|
---|
539 | {
|
---|
540 | fd_set fds;
|
---|
541 | struct timeval tvwait;
|
---|
542 | int cc = 0;
|
---|
543 | socklen_t fromlen = sizeof(*fromp);
|
---|
544 |
|
---|
545 | FD_ZERO(&fds);
|
---|
546 | FD_SET(sock, &fds);
|
---|
547 |
|
---|
548 | tvwait.tv_sec = waittime;
|
---|
549 | tvwait.tv_usec = 0;
|
---|
550 |
|
---|
551 | if (select(sock + 1, &fds, NULL, NULL, &tvwait) > 0)
|
---|
552 | cc = recvfrom(sock, (char *)packet, sizeof(packet), 0,
|
---|
553 | (struct sockaddr *)fromp, &fromlen);
|
---|
554 |
|
---|
555 | return cc;
|
---|
556 | }
|
---|
557 |
|
---|
558 | /*
|
---|
559 | * Checksum routine for Internet Protocol family headers (C Version)
|
---|
560 | */
|
---|
561 | static uint16_t
|
---|
562 | in_cksum(uint16_t *addr, int len)
|
---|
563 | {
|
---|
564 | int nleft = len;
|
---|
565 | uint16_t *w = addr;
|
---|
566 | uint16_t answer;
|
---|
567 | int sum = 0;
|
---|
568 |
|
---|
569 | /*
|
---|
570 | * Our algorithm is simple, using a 32 bit accumulator (sum),
|
---|
571 | * we add sequential 16 bit words to it, and at the end, fold
|
---|
572 | * back all the carry bits from the top 16 bits into the lower
|
---|
573 | * 16 bits.
|
---|
574 | */
|
---|
575 | while (nleft > 1) {
|
---|
576 | sum += *w++;
|
---|
577 | nleft -= 2;
|
---|
578 | }
|
---|
579 |
|
---|
580 | /* mop up an odd byte, if necessary */
|
---|
581 | if (nleft == 1)
|
---|
582 | sum += *(unsigned char *)w;
|
---|
583 |
|
---|
584 | /*
|
---|
585 | * add back carry outs from top 16 bits to low 16 bits
|
---|
586 | */
|
---|
587 | sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
|
---|
588 | sum += (sum >> 16); /* add carry */
|
---|
589 | answer = ~sum; /* truncate to 16 bits */
|
---|
590 | return answer;
|
---|
591 | }
|
---|
592 |
|
---|
593 |
|
---|
594 | static void
|
---|
595 | send_probe(int seq, int ttl)
|
---|
596 | {
|
---|
597 | int cc;
|
---|
598 | struct udpiphdr *ui, *oui;
|
---|
599 | struct ip tip;
|
---|
600 |
|
---|
601 | outip->ip_ttl = ttl;
|
---|
602 | outip->ip_id = htons(ident + seq);
|
---|
603 |
|
---|
604 | /*
|
---|
605 | * In most cases, the kernel will recalculate the ip checksum.
|
---|
606 | * But we must do it anyway so that the udp checksum comes out
|
---|
607 | * right.
|
---|
608 | */
|
---|
609 | if (doipcksum) {
|
---|
610 | outip->ip_sum =
|
---|
611 | in_cksum((uint16_t *)outip, sizeof(*outip) + optlen);
|
---|
612 | if (outip->ip_sum == 0)
|
---|
613 | outip->ip_sum = 0xffff;
|
---|
614 | }
|
---|
615 |
|
---|
616 | /* Payload */
|
---|
617 | outdata->seq = seq;
|
---|
618 | outdata->ttl = ttl;
|
---|
619 | // UNUSED: was storing gettimeofday's result there, but never ever checked it
|
---|
620 | /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
|
---|
621 |
|
---|
622 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
---|
623 | if (useicmp)
|
---|
624 | outicmp->icmp_seq = htons(seq);
|
---|
625 | else
|
---|
626 | #endif
|
---|
627 | outudp->dest = htons(port + seq);
|
---|
628 |
|
---|
629 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
---|
630 | if (useicmp) {
|
---|
631 | /* Always calculate checksum for icmp packets */
|
---|
632 | outicmp->icmp_cksum = 0;
|
---|
633 | outicmp->icmp_cksum = in_cksum((uint16_t *)outicmp,
|
---|
634 | packlen - (sizeof(*outip) + optlen));
|
---|
635 | if (outicmp->icmp_cksum == 0)
|
---|
636 | outicmp->icmp_cksum = 0xffff;
|
---|
637 | } else
|
---|
638 | #endif
|
---|
639 | if (doipcksum) {
|
---|
640 | /* Checksum (we must save and restore ip header) */
|
---|
641 | tip = *outip;
|
---|
642 | ui = (struct udpiphdr *)outip;
|
---|
643 | oui = (struct udpiphdr *)&tip;
|
---|
644 | /* Easier to zero and put back things that are ok */
|
---|
645 | memset((char *)ui, 0, sizeof(ui->ui_i));
|
---|
646 | ui->ui_src = oui->ui_src;
|
---|
647 | ui->ui_dst = oui->ui_dst;
|
---|
648 | ui->ui_pr = oui->ui_pr;
|
---|
649 | ui->ui_len = outudp->len;
|
---|
650 | outudp->check = 0;
|
---|
651 | outudp->check = in_cksum((uint16_t *)ui, packlen);
|
---|
652 | if (outudp->check == 0)
|
---|
653 | outudp->check = 0xffff;
|
---|
654 | *outip = tip;
|
---|
655 | }
|
---|
656 |
|
---|
657 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
658 | /* XXX undocumented debugging hack */
|
---|
659 | if (verbose > 1) {
|
---|
660 | const uint16_t *sp;
|
---|
661 | int nshorts, i;
|
---|
662 |
|
---|
663 | sp = (uint16_t *)outip;
|
---|
664 | nshorts = (unsigned)packlen / sizeof(uint16_t);
|
---|
665 | i = 0;
|
---|
666 | printf("[ %d bytes", packlen);
|
---|
667 | while (--nshorts >= 0) {
|
---|
668 | if ((i++ % 8) == 0)
|
---|
669 | printf("\n\t");
|
---|
670 | printf(" %04x", ntohs(*sp));
|
---|
671 | sp++;
|
---|
672 | }
|
---|
673 | if (packlen & 1) {
|
---|
674 | if ((i % 8) == 0)
|
---|
675 | printf("\n\t");
|
---|
676 | printf(" %02x", *(unsigned char *)sp);
|
---|
677 | }
|
---|
678 | printf("]\n");
|
---|
679 | }
|
---|
680 | #endif
|
---|
681 |
|
---|
682 | #if !defined(IP_HDRINCL) && defined(IP_TTL)
|
---|
683 | if (setsockopt(sndsock, IPPROTO_IP, IP_TTL,
|
---|
684 | (char *)&ttl, sizeof(ttl)) < 0) {
|
---|
685 | bb_perror_msg_and_die("setsockopt ttl %d", ttl);
|
---|
686 | }
|
---|
687 | #endif
|
---|
688 |
|
---|
689 | cc = xsendto(sndsock, (char *)outip,
|
---|
690 | packlen, (struct sockaddr *)&whereto, sizeof(whereto));
|
---|
691 | if (cc != packlen) {
|
---|
692 | bb_info_msg("wrote %s %d chars, ret=%d", hostname, packlen, cc);
|
---|
693 | }
|
---|
694 | }
|
---|
695 |
|
---|
696 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
697 | /*
|
---|
698 | * Convert an ICMP "type" field to a printable string.
|
---|
699 | */
|
---|
700 | static inline const char *
|
---|
701 | pr_type(unsigned char t)
|
---|
702 | {
|
---|
703 | static const char *const ttab[] = {
|
---|
704 | "Echo Reply", "ICMP 1", "ICMP 2", "Dest Unreachable",
|
---|
705 | "Source Quench", "Redirect", "ICMP 6", "ICMP 7",
|
---|
706 | "Echo", "Router Advert", "Router Solicit", "Time Exceeded",
|
---|
707 | "Param Problem", "Timestamp", "Timestamp Reply", "Info Request",
|
---|
708 | "Info Reply", "Mask Request", "Mask Reply"
|
---|
709 | };
|
---|
710 |
|
---|
711 | if (t > 18)
|
---|
712 | return "OUT-OF-RANGE";
|
---|
713 |
|
---|
714 | return ttab[t];
|
---|
715 | }
|
---|
716 | #endif
|
---|
717 |
|
---|
718 | static int
|
---|
719 | packet_ok(unsigned char *buf, int cc, struct sockaddr_in *from, int seq)
|
---|
720 | {
|
---|
721 | struct icmp *icp;
|
---|
722 | unsigned char type, code;
|
---|
723 | int hlen;
|
---|
724 | struct ip *ip;
|
---|
725 |
|
---|
726 | ip = (struct ip *) buf;
|
---|
727 | hlen = ip->ip_hl << 2;
|
---|
728 | if (cc < hlen + ICMP_MINLEN) {
|
---|
729 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
730 | if (verbose)
|
---|
731 | printf("packet too short (%d bytes) from %s\n", cc,
|
---|
732 | inet_ntoa(from->sin_addr));
|
---|
733 | #endif
|
---|
734 | return 0;
|
---|
735 | }
|
---|
736 | cc -= hlen;
|
---|
737 | icp = (struct icmp *)(buf + hlen);
|
---|
738 | type = icp->icmp_type;
|
---|
739 | code = icp->icmp_code;
|
---|
740 | /* Path MTU Discovery (RFC1191) */
|
---|
741 | if (code != ICMP_UNREACH_NEEDFRAG)
|
---|
742 | pmtu = 0;
|
---|
743 | else {
|
---|
744 | pmtu = ntohs(icp->icmp_nextmtu);
|
---|
745 | }
|
---|
746 | if ((type == ICMP_TIMXCEED && code == ICMP_TIMXCEED_INTRANS) ||
|
---|
747 | type == ICMP_UNREACH || type == ICMP_ECHOREPLY) {
|
---|
748 | struct ip *hip;
|
---|
749 | struct udphdr *up;
|
---|
750 |
|
---|
751 | hip = &icp->icmp_ip;
|
---|
752 | hlen = hip->ip_hl << 2;
|
---|
753 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
---|
754 | if (useicmp) {
|
---|
755 | struct icmp *hicmp;
|
---|
756 |
|
---|
757 | /* XXX */
|
---|
758 | if (type == ICMP_ECHOREPLY &&
|
---|
759 | icp->icmp_id == htons(ident) &&
|
---|
760 | icp->icmp_seq == htons(seq))
|
---|
761 | return -2;
|
---|
762 |
|
---|
763 | hicmp = (struct icmp *)((unsigned char *)hip + hlen);
|
---|
764 | /* XXX 8 is a magic number */
|
---|
765 | if (hlen + 8 <= cc &&
|
---|
766 | hip->ip_p == IPPROTO_ICMP &&
|
---|
767 | hicmp->icmp_id == htons(ident) &&
|
---|
768 | hicmp->icmp_seq == htons(seq))
|
---|
769 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
770 | } else
|
---|
771 | #endif
|
---|
772 | {
|
---|
773 | up = (struct udphdr *)((unsigned char *)hip + hlen);
|
---|
774 | /* XXX 8 is a magic number */
|
---|
775 | if (hlen + 12 <= cc &&
|
---|
776 | hip->ip_p == IPPROTO_UDP &&
|
---|
777 | up->source == htons(ident) &&
|
---|
778 | up->dest == htons(port + seq))
|
---|
779 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
780 | }
|
---|
781 | }
|
---|
782 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
783 | if (verbose) {
|
---|
784 | int i;
|
---|
785 | uint32_t *lp = (uint32_t *)&icp->icmp_ip;
|
---|
786 |
|
---|
787 | printf("\n%d bytes from %s to "
|
---|
788 | "%s: icmp type %d (%s) code %d\n",
|
---|
789 | cc, inet_ntoa(from->sin_addr),
|
---|
790 | inet_ntoa(ip->ip_dst), type, pr_type(type), icp->icmp_code);
|
---|
791 | for (i = 4; i < cc; i += sizeof(*lp))
|
---|
792 | printf("%2d: x%8.8x\n", i, *lp++);
|
---|
793 | }
|
---|
794 | #endif
|
---|
795 | return 0;
|
---|
796 | }
|
---|
797 |
|
---|
798 |
|
---|
799 | /*
|
---|
800 | * Construct an Internet address representation.
|
---|
801 | * If the nflag has been supplied, give
|
---|
802 | * numeric value, otherwise try for symbolic name.
|
---|
803 | */
|
---|
804 | static inline void
|
---|
805 | print_inetname(struct sockaddr_in *from)
|
---|
806 | {
|
---|
807 | const char *ina;
|
---|
808 |
|
---|
809 | ina = inet_ntoa(from->sin_addr);
|
---|
810 | if (nflag)
|
---|
811 | printf(" %s", ina);
|
---|
812 | else {
|
---|
813 | char *n = NULL;
|
---|
814 | if (from->sin_addr.s_addr != INADDR_ANY)
|
---|
815 | n = xmalloc_sockaddr2host_noport((struct sockaddr*)from);
|
---|
816 | printf(" %s (%s)", (n ? n : ina), ina);
|
---|
817 | free(n);
|
---|
818 | }
|
---|
819 | }
|
---|
820 |
|
---|
821 | static inline void
|
---|
822 | print(unsigned char *buf, int cc, struct sockaddr_in *from)
|
---|
823 | {
|
---|
824 | struct ip *ip;
|
---|
825 | int hlen;
|
---|
826 |
|
---|
827 | ip = (struct ip *) buf;
|
---|
828 | hlen = ip->ip_hl << 2;
|
---|
829 | cc -= hlen;
|
---|
830 |
|
---|
831 | print_inetname(from);
|
---|
832 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
833 | if (verbose)
|
---|
834 | printf(" %d bytes to %s", cc, inet_ntoa(ip->ip_dst));
|
---|
835 | #endif
|
---|
836 | }
|
---|
837 |
|
---|
838 |
|
---|
839 | static struct hostinfo *
|
---|
840 | gethostinfo(const char *host)
|
---|
841 | {
|
---|
842 | int n;
|
---|
843 | struct hostent *hp;
|
---|
844 | struct hostinfo *hi;
|
---|
845 | char **p;
|
---|
846 | uint32_t addr, *ap;
|
---|
847 |
|
---|
848 | hi = xzalloc(sizeof(*hi));
|
---|
849 | addr = inet_addr(host);
|
---|
850 | if (addr != 0xffffffff) {
|
---|
851 | hi->name = xstrdup(host);
|
---|
852 | hi->n = 1;
|
---|
853 | hi->addrs = xzalloc(sizeof(hi->addrs[0]));
|
---|
854 | hi->addrs[0] = addr;
|
---|
855 | return hi;
|
---|
856 | }
|
---|
857 |
|
---|
858 | hp = xgethostbyname(host);
|
---|
859 | if (hp->h_addrtype != AF_INET || hp->h_length != 4)
|
---|
860 | bb_perror_msg_and_die("bad host %s", host);
|
---|
861 | hi->name = xstrdup(hp->h_name);
|
---|
862 | for (n = 0, p = hp->h_addr_list; *p != NULL; ++n, ++p)
|
---|
863 | continue;
|
---|
864 | hi->n = n;
|
---|
865 | hi->addrs = xzalloc(n * sizeof(hi->addrs[0]));
|
---|
866 | for (ap = hi->addrs, p = hp->h_addr_list; *p != NULL; ++ap, ++p)
|
---|
867 | memcpy(ap, *p, sizeof(*ap));
|
---|
868 | return hi;
|
---|
869 | }
|
---|
870 |
|
---|
871 | static void
|
---|
872 | freehostinfo(struct hostinfo *hi)
|
---|
873 | {
|
---|
874 | free(hi->name);
|
---|
875 | free(hi->addrs);
|
---|
876 | free(hi);
|
---|
877 | }
|
---|
878 |
|
---|
879 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
880 | static void
|
---|
881 | getaddr(uint32_t *ap, const char *host)
|
---|
882 | {
|
---|
883 | struct hostinfo *hi;
|
---|
884 |
|
---|
885 | hi = gethostinfo(host);
|
---|
886 | *ap = hi->addrs[0];
|
---|
887 | freehostinfo(hi);
|
---|
888 | }
|
---|
889 | #endif
|
---|
890 |
|
---|
891 | static void
|
---|
892 | print_delta_ms(unsigned t1p, unsigned t2p)
|
---|
893 | {
|
---|
894 | unsigned tt = t2p - t1p;
|
---|
895 | printf(" %u.%03u ms", tt/1000, tt%1000);
|
---|
896 | }
|
---|
897 |
|
---|
898 | int traceroute_main(int argc, char **argv);
|
---|
899 | int traceroute_main(int argc, char **argv)
|
---|
900 | {
|
---|
901 | int code, n;
|
---|
902 | unsigned char *outp;
|
---|
903 | uint32_t *ap;
|
---|
904 | struct sockaddr_in *from;
|
---|
905 | struct sockaddr_in *to;
|
---|
906 | struct hostinfo *hi;
|
---|
907 | int ttl, probe, i;
|
---|
908 | int seq = 0;
|
---|
909 | int tos = 0;
|
---|
910 | char *tos_str;
|
---|
911 | char *source;
|
---|
912 | unsigned op;
|
---|
913 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
914 | int lsrr = 0;
|
---|
915 | #endif
|
---|
916 | uint16_t off = 0;
|
---|
917 | struct IFADDRLIST *al;
|
---|
918 | char *device;
|
---|
919 | int max_ttl = 30;
|
---|
920 | char *max_ttl_str;
|
---|
921 | char *port_str;
|
---|
922 | int nprobes = 3;
|
---|
923 | char *nprobes_str;
|
---|
924 | char *waittime_str;
|
---|
925 | unsigned pausemsecs = 0;
|
---|
926 | char *pausemsecs_str;
|
---|
927 | int first_ttl = 1;
|
---|
928 | char *first_ttl_str;
|
---|
929 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
930 | llist_t *source_route_list = NULL;
|
---|
931 | #endif
|
---|
932 |
|
---|
933 | PTR_TO_GLOBALS = xzalloc(sizeof(G));
|
---|
934 | from = (struct sockaddr_in *)&wherefrom;
|
---|
935 | to = (struct sockaddr_in *)&whereto;
|
---|
936 |
|
---|
937 | //opterr = 0;
|
---|
938 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
939 | opt_complementary = "x-x:g::";
|
---|
940 | #else
|
---|
941 | opt_complementary = "x-x";
|
---|
942 | #endif
|
---|
943 |
|
---|
944 | op = getopt32(argv, "FIlnrdvxt:i:m:p:q:s:w:z:f:"
|
---|
945 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
946 | "g:"
|
---|
947 | #endif
|
---|
948 | , &tos_str, &device, &max_ttl_str, &port_str, &nprobes_str
|
---|
949 | , &source, &waittime_str, &pausemsecs_str, &first_ttl_str
|
---|
950 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
951 | , &source_route_list
|
---|
952 | #endif
|
---|
953 | );
|
---|
954 |
|
---|
955 | if (op & OPT_DONT_FRAGMNT)
|
---|
956 | off = IP_DF;
|
---|
957 | if (op & OPT_IP_CHKSUM) {
|
---|
958 | doipcksum = 0;
|
---|
959 | bb_error_msg("warning: ip checksums disabled");
|
---|
960 | }
|
---|
961 | if (op & OPT_TOS)
|
---|
962 | tos = xatou_range(tos_str, 0, 255);
|
---|
963 | if (op & OPT_MAX_TTL)
|
---|
964 | max_ttl = xatou_range(max_ttl_str, 1, 255);
|
---|
965 | if (op & OPT_PORT)
|
---|
966 | port = xatou16(port_str);
|
---|
967 | if (op & OPT_NPROBES)
|
---|
968 | nprobes = xatou_range(nprobes_str, 1, INT_MAX);
|
---|
969 | if (op & OPT_SOURCE) {
|
---|
970 | /*
|
---|
971 | * set the ip source address of the outbound
|
---|
972 | * probe (e.g., on a multi-homed host).
|
---|
973 | */
|
---|
974 | if (getuid())
|
---|
975 | bb_error_msg_and_die("-s %s: permission denied", source);
|
---|
976 | }
|
---|
977 | if (op & OPT_WAITTIME)
|
---|
978 | waittime = xatou_range(waittime_str, 2, 24 * 60 * 60);
|
---|
979 | if (op & OPT_PAUSE_MS)
|
---|
980 | pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
|
---|
981 | if (op & OPT_FIRST_TTL)
|
---|
982 | first_ttl = xatou_range(first_ttl_str, 1, 255);
|
---|
983 |
|
---|
984 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
985 | if (source_route_list) {
|
---|
986 | llist_t *l_sr;
|
---|
987 |
|
---|
988 | l_sr = source_route_list;
|
---|
989 | while (l_sr) {
|
---|
990 | if (lsrr >= NGATEWAYS)
|
---|
991 | bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
|
---|
992 | getaddr(gwlist + lsrr, l_sr->data);
|
---|
993 | ++lsrr;
|
---|
994 | l_sr = l_sr->link;
|
---|
995 | free(source_route_list);
|
---|
996 | source_route_list = l_sr;
|
---|
997 | }
|
---|
998 | optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
---|
999 | }
|
---|
1000 | #endif
|
---|
1001 |
|
---|
1002 | if (first_ttl > max_ttl) {
|
---|
1003 | bb_error_msg_and_die(
|
---|
1004 | "first ttl (%d) may not be greater than max ttl (%d)",
|
---|
1005 | first_ttl, max_ttl);
|
---|
1006 | }
|
---|
1007 |
|
---|
1008 | minpacket = sizeof(*outip) + sizeof(*outdata) + optlen;
|
---|
1009 |
|
---|
1010 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
---|
1011 | if (useicmp)
|
---|
1012 | minpacket += 8; /* XXX magic number */
|
---|
1013 | else
|
---|
1014 | #endif
|
---|
1015 | minpacket += sizeof(*outudp);
|
---|
1016 | packlen = minpacket; /* minimum sized packet */
|
---|
1017 |
|
---|
1018 | /* Process destination and optional packet size */
|
---|
1019 | switch (argc - optind) {
|
---|
1020 |
|
---|
1021 | case 2:
|
---|
1022 | packlen = xatoul_range(argv[optind + 1], minpacket, maxpacket);
|
---|
1023 | /* Fall through */
|
---|
1024 |
|
---|
1025 | case 1:
|
---|
1026 | hostname = argv[optind];
|
---|
1027 | hi = gethostinfo(hostname);
|
---|
1028 | setsin(to, hi->addrs[0]);
|
---|
1029 | if (hi->n > 1)
|
---|
1030 | bb_error_msg("warning: %s has multiple addresses; using %s",
|
---|
1031 | hostname, inet_ntoa(to->sin_addr));
|
---|
1032 | hostname = hi->name;
|
---|
1033 | hi->name = NULL;
|
---|
1034 | freehostinfo(hi);
|
---|
1035 | break;
|
---|
1036 |
|
---|
1037 | default:
|
---|
1038 | bb_show_usage();
|
---|
1039 | }
|
---|
1040 |
|
---|
1041 | /* Ensure the socket fds won't be 0, 1 or 2 */
|
---|
1042 | bb_sanitize_stdio();
|
---|
1043 |
|
---|
1044 | s = xsocket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
|
---|
1045 |
|
---|
1046 | #if TRACEROUTE_SO_DEBUG
|
---|
1047 | if (op & OPT_DEBUG)
|
---|
1048 | setsockopt(s, SOL_SOCKET, SO_DEBUG,
|
---|
1049 | &const_int_1, sizeof(const_int_1));
|
---|
1050 | #endif
|
---|
1051 | if (op & OPT_BYPASS_ROUTE)
|
---|
1052 | setsockopt(s, SOL_SOCKET, SO_DONTROUTE,
|
---|
1053 | &const_int_1, sizeof(const_int_1));
|
---|
1054 |
|
---|
1055 | sndsock = xsocket(AF_INET, SOCK_RAW, IPPROTO_RAW);
|
---|
1056 |
|
---|
1057 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
1058 | #if defined(IP_OPTIONS)
|
---|
1059 | if (lsrr > 0) {
|
---|
1060 | unsigned char optlist[MAX_IPOPTLEN];
|
---|
1061 |
|
---|
1062 | /* final hop */
|
---|
1063 | gwlist[lsrr] = to->sin_addr.s_addr;
|
---|
1064 | ++lsrr;
|
---|
1065 |
|
---|
1066 | /* force 4 byte alignment */
|
---|
1067 | optlist[0] = IPOPT_NOP;
|
---|
1068 | /* loose source route option */
|
---|
1069 | optlist[1] = IPOPT_LSRR;
|
---|
1070 | i = lsrr * sizeof(gwlist[0]);
|
---|
1071 | optlist[2] = i + 3;
|
---|
1072 | /* Pointer to LSRR addresses */
|
---|
1073 | optlist[3] = IPOPT_MINOFF;
|
---|
1074 | memcpy(optlist + 4, gwlist, i);
|
---|
1075 |
|
---|
1076 | if ((setsockopt(sndsock, IPPROTO_IP, IP_OPTIONS,
|
---|
1077 | (char *)optlist, i + sizeof(gwlist[0]))) < 0) {
|
---|
1078 | bb_perror_msg_and_die("IP_OPTIONS");
|
---|
1079 | }
|
---|
1080 | }
|
---|
1081 | #endif /* IP_OPTIONS */
|
---|
1082 | #endif /* CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE */
|
---|
1083 |
|
---|
1084 | #ifdef SO_SNDBUF
|
---|
1085 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
|
---|
1086 | bb_perror_msg_and_die("SO_SNDBUF");
|
---|
1087 | }
|
---|
1088 | #endif
|
---|
1089 | #ifdef IP_HDRINCL
|
---|
1090 | if (setsockopt(sndsock, IPPROTO_IP, IP_HDRINCL, &const_int_1, sizeof(const_int_1)) < 0
|
---|
1091 | && errno != ENOPROTOOPT
|
---|
1092 | ) {
|
---|
1093 | bb_perror_msg_and_die("IP_HDRINCL");
|
---|
1094 | }
|
---|
1095 | #else
|
---|
1096 | #ifdef IP_TOS
|
---|
1097 | if (tos_str && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
|
---|
1098 | bb_perror_msg_and_die("setsockopt tos %d", tos);
|
---|
1099 | }
|
---|
1100 | #endif
|
---|
1101 | #endif
|
---|
1102 | #if TRACEROUTE_SO_DEBUG
|
---|
1103 | if (op & OPT_DEBUG)
|
---|
1104 | setsockopt(sndsock, SOL_SOCKET, SO_DEBUG,
|
---|
1105 | &const_int_1, sizeof(const_int_1));
|
---|
1106 | #endif
|
---|
1107 | if (op & OPT_BYPASS_ROUTE)
|
---|
1108 | setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
|
---|
1109 | &const_int_1, sizeof(const_int_1));
|
---|
1110 |
|
---|
1111 | /* Revert to non-privileged user after opening sockets */
|
---|
1112 | xsetgid(getgid());
|
---|
1113 | xsetuid(getuid());
|
---|
1114 |
|
---|
1115 | outip = xzalloc(packlen);
|
---|
1116 |
|
---|
1117 | outip->ip_v = IPVERSION;
|
---|
1118 | if (tos_str)
|
---|
1119 | outip->ip_tos = tos;
|
---|
1120 | outip->ip_len = htons(packlen);
|
---|
1121 | outip->ip_off = htons(off);
|
---|
1122 | outp = (unsigned char *)(outip + 1);
|
---|
1123 | outip->ip_dst = to->sin_addr;
|
---|
1124 |
|
---|
1125 | outip->ip_hl = (outp - (unsigned char *)outip) >> 2;
|
---|
1126 | ident = (getpid() & 0xffff) | 0x8000;
|
---|
1127 | #if ENABLE_FEATURE_TRACEROUTE_USE_ICMP
|
---|
1128 | if (useicmp) {
|
---|
1129 | outip->ip_p = IPPROTO_ICMP;
|
---|
1130 | outicmp = (struct icmp *)outp;
|
---|
1131 | outicmp->icmp_type = ICMP_ECHO;
|
---|
1132 | outicmp->icmp_id = htons(ident);
|
---|
1133 | outdata = (struct outdata *)(outp + 8); /* XXX magic number */
|
---|
1134 | } else
|
---|
1135 | #endif
|
---|
1136 | {
|
---|
1137 | outip->ip_p = IPPROTO_UDP;
|
---|
1138 | outudp = (struct udphdr *)outp;
|
---|
1139 | outudp->source = htons(ident);
|
---|
1140 | outudp->len = htons((uint16_t)(packlen - (sizeof(*outip) + optlen)));
|
---|
1141 | outdata = (struct outdata *)(outudp + 1);
|
---|
1142 | }
|
---|
1143 |
|
---|
1144 | /* Get the interface address list */
|
---|
1145 | n = ifaddrlist(&al);
|
---|
1146 |
|
---|
1147 | /* Look for a specific device */
|
---|
1148 | if (op & OPT_DEVICE) {
|
---|
1149 | for (i = n; i > 0; --i, ++al)
|
---|
1150 | if (strcmp(device, al->device) == 0)
|
---|
1151 | goto found_dev;
|
---|
1152 | bb_error_msg_and_die("can't find interface %s", device);
|
---|
1153 | }
|
---|
1154 | found_dev:
|
---|
1155 |
|
---|
1156 | /* Determine our source address */
|
---|
1157 | if (!(op & OPT_SOURCE)) {
|
---|
1158 | /*
|
---|
1159 | * If a device was specified, use the interface address.
|
---|
1160 | * Otherwise, try to determine our source address.
|
---|
1161 | */
|
---|
1162 | if (op & OPT_DEVICE)
|
---|
1163 | setsin(from, al->addr);
|
---|
1164 | findsaddr(to, from);
|
---|
1165 | } else {
|
---|
1166 | hi = gethostinfo(source);
|
---|
1167 | source = hi->name;
|
---|
1168 | hi->name = NULL;
|
---|
1169 | /*
|
---|
1170 | * If the device was specified make sure it
|
---|
1171 | * corresponds to the source address specified.
|
---|
1172 | * Otherwise, use the first address (and warn if
|
---|
1173 | * there are more than one).
|
---|
1174 | */
|
---|
1175 | if (op & OPT_DEVICE) {
|
---|
1176 | for (i = hi->n, ap = hi->addrs; i > 0; --i, ++ap)
|
---|
1177 | if (*ap == al->addr)
|
---|
1178 | goto found_dev2;
|
---|
1179 | bb_error_msg_and_die("%s is not on interface %s",
|
---|
1180 | source, device);
|
---|
1181 | found_dev2:
|
---|
1182 | setsin(from, *ap);
|
---|
1183 | } else {
|
---|
1184 | setsin(from, hi->addrs[0]);
|
---|
1185 | if (hi->n > 1)
|
---|
1186 | bb_error_msg(
|
---|
1187 | "warning: %s has multiple addresses; using %s",
|
---|
1188 | source, inet_ntoa(from->sin_addr));
|
---|
1189 | }
|
---|
1190 | freehostinfo(hi);
|
---|
1191 | }
|
---|
1192 |
|
---|
1193 | outip->ip_src = from->sin_addr;
|
---|
1194 | #ifndef IP_HDRINCL
|
---|
1195 | xbind(sndsock, (struct sockaddr *)from, sizeof(*from));
|
---|
1196 | #endif
|
---|
1197 |
|
---|
1198 | printf("traceroute to %s (%s)", hostname, inet_ntoa(to->sin_addr));
|
---|
1199 | if (op & OPT_SOURCE)
|
---|
1200 | printf(" from %s", source);
|
---|
1201 | printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
|
---|
1202 | fflush(stdout);
|
---|
1203 |
|
---|
1204 | for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
---|
1205 | uint32_t lastaddr = 0;
|
---|
1206 | int gotlastaddr = 0;
|
---|
1207 | int got_there = 0;
|
---|
1208 | int unreachable = 0;
|
---|
1209 | int sentfirst = 0;
|
---|
1210 |
|
---|
1211 | printf("%2d ", ttl);
|
---|
1212 | for (probe = 0; probe < nprobes; ++probe) {
|
---|
1213 | int cc;
|
---|
1214 | unsigned t1;
|
---|
1215 | unsigned t2;
|
---|
1216 | struct ip *ip;
|
---|
1217 |
|
---|
1218 | if (sentfirst && pausemsecs > 0)
|
---|
1219 | usleep(pausemsecs * 1000);
|
---|
1220 | t1 = monotonic_us();
|
---|
1221 | send_probe(++seq, ttl);
|
---|
1222 | ++sentfirst;
|
---|
1223 | while ((cc = wait_for_reply(s, from)) != 0) {
|
---|
1224 | t2 = monotonic_us();
|
---|
1225 | i = packet_ok(packet, cc, from, seq);
|
---|
1226 | /* Skip short packet */
|
---|
1227 | if (i == 0)
|
---|
1228 | continue;
|
---|
1229 | if (!gotlastaddr ||
|
---|
1230 | from->sin_addr.s_addr != lastaddr) {
|
---|
1231 | print(packet, cc, from);
|
---|
1232 | lastaddr = from->sin_addr.s_addr;
|
---|
1233 | ++gotlastaddr;
|
---|
1234 | }
|
---|
1235 | print_delta_ms(t1, t2);
|
---|
1236 | ip = (struct ip *)packet;
|
---|
1237 | if (op & OPT_TTL_FLAG)
|
---|
1238 | printf(" (%d)", ip->ip_ttl);
|
---|
1239 | if (i == -2) {
|
---|
1240 | if (ip->ip_ttl <= 1)
|
---|
1241 | printf(" !");
|
---|
1242 | ++got_there;
|
---|
1243 | break;
|
---|
1244 | }
|
---|
1245 | /* time exceeded in transit */
|
---|
1246 | if (i == -1)
|
---|
1247 | break;
|
---|
1248 | code = i - 1;
|
---|
1249 | switch (code) {
|
---|
1250 |
|
---|
1251 | case ICMP_UNREACH_PORT:
|
---|
1252 | if (ip->ip_ttl <= 1)
|
---|
1253 | printf(" !");
|
---|
1254 | ++got_there;
|
---|
1255 | break;
|
---|
1256 |
|
---|
1257 | case ICMP_UNREACH_NET:
|
---|
1258 | ++unreachable;
|
---|
1259 | printf(" !N");
|
---|
1260 | break;
|
---|
1261 |
|
---|
1262 | case ICMP_UNREACH_HOST:
|
---|
1263 | ++unreachable;
|
---|
1264 | printf(" !H");
|
---|
1265 | break;
|
---|
1266 |
|
---|
1267 | case ICMP_UNREACH_PROTOCOL:
|
---|
1268 | ++got_there;
|
---|
1269 | printf(" !P");
|
---|
1270 | break;
|
---|
1271 |
|
---|
1272 | case ICMP_UNREACH_NEEDFRAG:
|
---|
1273 | ++unreachable;
|
---|
1274 | printf(" !F-%d", pmtu);
|
---|
1275 | break;
|
---|
1276 |
|
---|
1277 | case ICMP_UNREACH_SRCFAIL:
|
---|
1278 | ++unreachable;
|
---|
1279 | printf(" !S");
|
---|
1280 | break;
|
---|
1281 |
|
---|
1282 | case ICMP_UNREACH_FILTER_PROHIB:
|
---|
1283 | case ICMP_UNREACH_NET_PROHIB: /* misuse */
|
---|
1284 | ++unreachable;
|
---|
1285 | printf(" !A");
|
---|
1286 | break;
|
---|
1287 |
|
---|
1288 | case ICMP_UNREACH_HOST_PROHIB:
|
---|
1289 | ++unreachable;
|
---|
1290 | printf(" !C");
|
---|
1291 | break;
|
---|
1292 |
|
---|
1293 | case ICMP_UNREACH_HOST_PRECEDENCE:
|
---|
1294 | ++unreachable;
|
---|
1295 | printf(" !V");
|
---|
1296 | break;
|
---|
1297 |
|
---|
1298 | case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
---|
1299 | ++unreachable;
|
---|
1300 | printf(" !C");
|
---|
1301 | break;
|
---|
1302 |
|
---|
1303 | case ICMP_UNREACH_NET_UNKNOWN:
|
---|
1304 | case ICMP_UNREACH_HOST_UNKNOWN:
|
---|
1305 | ++unreachable;
|
---|
1306 | printf(" !U");
|
---|
1307 | break;
|
---|
1308 |
|
---|
1309 | case ICMP_UNREACH_ISOLATED:
|
---|
1310 | ++unreachable;
|
---|
1311 | printf(" !I");
|
---|
1312 | break;
|
---|
1313 |
|
---|
1314 | case ICMP_UNREACH_TOSNET:
|
---|
1315 | case ICMP_UNREACH_TOSHOST:
|
---|
1316 | ++unreachable;
|
---|
1317 | printf(" !T");
|
---|
1318 | break;
|
---|
1319 |
|
---|
1320 | default:
|
---|
1321 | ++unreachable;
|
---|
1322 | printf(" !<%d>", code);
|
---|
1323 | break;
|
---|
1324 | }
|
---|
1325 | break;
|
---|
1326 | }
|
---|
1327 | if (cc == 0)
|
---|
1328 | printf(" *");
|
---|
1329 | (void)fflush(stdout);
|
---|
1330 | }
|
---|
1331 | putchar('\n');
|
---|
1332 | if (got_there ||
|
---|
1333 | (unreachable > 0 && unreachable >= nprobes - 1))
|
---|
1334 | break;
|
---|
1335 | }
|
---|
1336 | return 0;
|
---|
1337 | }
|
---|