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 | /*
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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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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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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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218 | //#define CONFIG_FEATURE_TRACEROUTE_VERBOSE
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219 | //#undef CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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220 | //#define CONFIG_FEATURE_TRACEROUTE_SOURCE_ROUTE
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221 | //#undef CONFIG_FEATURE_TRACEROUTE_USE_ICMP
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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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226 | #include <arpa/inet.h>
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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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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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238 |
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239 | #include "libbb.h"
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240 | #include "inet_common.h"
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241 |
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242 | #ifndef IPPROTO_ICMP
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243 | # define IPPROTO_ICMP 1
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244 | #endif
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245 | #ifndef IPPROTO_IP
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246 | # define IPPROTO_IP 0
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247 | #endif
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248 |
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249 |
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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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274 | };
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275 | #define verbose (option_mask32 & OPT_VERBOSE)
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276 |
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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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281 | };
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282 |
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283 | /* Data section of the probe packet */
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284 | struct outdata_t {
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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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287 | // UNUSED. Retaining to have the same packet size.
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288 | struct timeval tv_UNUSED PACKED; /* time packet left */
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289 | };
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290 |
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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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296 | };
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297 | #endif
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298 |
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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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308 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
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309 | int optlen; /* length of ip options */
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310 | #else
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311 | #define optlen 0
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312 | #endif
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313 | unsigned char recv_pkt[512]; /* last inbound (icmp) packet */
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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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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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335 | #define gwlist (G.gwlist )
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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)
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341 |
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342 | #define outicmp ((struct icmp *)(outip + 1))
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343 | #define outudp ((struct udphdr *)(outip + 1))
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344 |
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345 |
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346 | /* libbb candidate? tftp uses this idiom too */
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347 | static len_and_sockaddr* dup_sockaddr(const len_and_sockaddr *lsa)
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348 | {
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349 | len_and_sockaddr *new_lsa = xzalloc(LSA_LEN_SIZE + lsa->len);
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350 | memcpy(new_lsa, lsa, LSA_LEN_SIZE + lsa->len);
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351 | return new_lsa;
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352 | }
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353 |
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354 |
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355 | static int
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356 | wait_for_reply(len_and_sockaddr *from_lsa, struct sockaddr *to)
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357 | {
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358 | struct pollfd pfd[1];
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359 | int read_len = 0;
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360 |
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361 | pfd[0].fd = rcvsock;
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362 | pfd[0].events = POLLIN;
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363 | if (safe_poll(pfd, 1, waittime * 1000) > 0) {
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364 | read_len = recv_from_to(rcvsock,
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365 | recv_pkt, sizeof(recv_pkt),
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366 | /*flags:*/ 0,
|
---|
367 | &from_lsa->u.sa, to, from_lsa->len);
|
---|
368 | }
|
---|
369 |
|
---|
370 | return read_len;
|
---|
371 | }
|
---|
372 |
|
---|
373 | /*
|
---|
374 | * Checksum routine for Internet Protocol family headers (C Version)
|
---|
375 | */
|
---|
376 | static uint16_t
|
---|
377 | in_cksum(uint16_t *addr, int len)
|
---|
378 | {
|
---|
379 | int nleft = len;
|
---|
380 | uint16_t *w = addr;
|
---|
381 | uint16_t answer;
|
---|
382 | int sum = 0;
|
---|
383 |
|
---|
384 | /*
|
---|
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.
|
---|
389 | */
|
---|
390 | while (nleft > 1) {
|
---|
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 |
|
---|
399 | /* add back carry outs from top 16 bits to low 16 bits */
|
---|
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
|
---|
407 | send_probe(int seq, int ttl)
|
---|
408 | {
|
---|
409 | int len, res;
|
---|
410 | void *out;
|
---|
411 |
|
---|
412 | /* Payload */
|
---|
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;
|
---|
424 | // UNUSED: was storing gettimeofday's result there, but never ever checked it
|
---|
425 | /*memcpy(&outdata->tv, tp, sizeof(outdata->tv));*/
|
---|
426 |
|
---|
427 | if (option_mask32 & OPT_USE_ICMP) {
|
---|
428 | outicmp->icmp_seq = htons(seq);
|
---|
429 |
|
---|
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 | }
|
---|
437 | }
|
---|
438 |
|
---|
439 | //BUG! verbose is (x & OPT_VERBOSE), not a counter!
|
---|
440 | #if 0 //ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
441 | /* XXX undocumented debugging hack */
|
---|
442 | if (verbose > 1) {
|
---|
443 | const uint16_t *sp;
|
---|
444 | int nshorts, i;
|
---|
445 |
|
---|
446 | sp = (uint16_t *)outip;
|
---|
447 | nshorts = (unsigned)packlen / sizeof(uint16_t);
|
---|
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 |
|
---|
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 | }
|
---|
487 | }
|
---|
488 |
|
---|
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);
|
---|
492 | }
|
---|
493 |
|
---|
494 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
495 | /*
|
---|
496 | * Convert an ICMP "type" field to a printable string.
|
---|
497 | */
|
---|
498 | static const char *
|
---|
499 | pr_type(unsigned char t)
|
---|
500 | {
|
---|
501 | static const char *const ttab[] = {
|
---|
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 | };
|
---|
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 | };
|
---|
516 |
|
---|
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))
|
---|
526 | return "OUT-OF-RANGE";
|
---|
527 |
|
---|
528 | return ttab[t];
|
---|
529 | }
|
---|
530 | #endif
|
---|
531 |
|
---|
532 | #if !ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
533 | #define packet4_ok(read_len, from, seq) \
|
---|
534 | packet4_ok(read_len, seq)
|
---|
535 | #endif
|
---|
536 | static int
|
---|
537 | packet4_ok(int read_len, const struct sockaddr_in *from, int seq)
|
---|
538 | {
|
---|
539 | const struct icmp *icp;
|
---|
540 | unsigned char type, code;
|
---|
541 | int hlen;
|
---|
542 | const struct ip *ip;
|
---|
543 |
|
---|
544 | ip = (struct ip *) recv_pkt;
|
---|
545 | hlen = ip->ip_hl << 2;
|
---|
546 | if (read_len < hlen + ICMP_MINLEN) {
|
---|
547 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
548 | if (verbose)
|
---|
549 | printf("packet too short (%d bytes) from %s\n", read_len,
|
---|
550 | inet_ntoa(from->sin_addr));
|
---|
551 | #endif
|
---|
552 | return 0;
|
---|
553 | }
|
---|
554 | read_len -= hlen;
|
---|
555 | icp = (struct icmp *)(recv_pkt + hlen);
|
---|
556 | type = icp->icmp_type;
|
---|
557 | code = icp->icmp_code;
|
---|
558 | /* Path MTU Discovery (RFC1191) */
|
---|
559 | pmtu = 0;
|
---|
560 | if (code == ICMP_UNREACH_NEEDFRAG)
|
---|
561 | pmtu = ntohs(icp->icmp_nextmtu);
|
---|
562 |
|
---|
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 |
|
---|
570 | hip = &icp->icmp_ip;
|
---|
571 | hlen = hip->ip_hl << 2;
|
---|
572 | if (option_mask32 & OPT_USE_ICMP) {
|
---|
573 | struct icmp *hicmp;
|
---|
574 |
|
---|
575 | /* XXX */
|
---|
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 | }
|
---|
582 |
|
---|
583 | hicmp = (struct icmp *)((unsigned char *)hip + hlen);
|
---|
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 | ) {
|
---|
589 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
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 | ) {
|
---|
601 | return (type == ICMP_TIMXCEED ? -1 : code + 1);
|
---|
602 | }
|
---|
603 | }
|
---|
604 | }
|
---|
605 | #if ENABLE_FEATURE_TRACEROUTE_VERBOSE
|
---|
606 | if (verbose) {
|
---|
607 | int i;
|
---|
608 | uint32_t *lp = (uint32_t *)&icp->icmp_ip;
|
---|
609 |
|
---|
610 | printf("\n%d bytes from %s to "
|
---|
611 | "%s: icmp type %d (%s) code %d\n",
|
---|
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))
|
---|
616 | printf("%2d: x%8.8x\n", i, *lp++);
|
---|
617 | }
|
---|
618 | #endif
|
---|
619 | return 0;
|
---|
620 | }
|
---|
621 |
|
---|
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)
|
---|
631 | {
|
---|
632 | const struct icmp6_hdr *icp;
|
---|
633 | unsigned char type, code;
|
---|
634 |
|
---|
635 | if (from_lsa->u.sa.sa_family == AF_INET)
|
---|
636 | return packet4_ok(read_len, &from_lsa->u.sin, seq);
|
---|
637 |
|
---|
638 | icp = (struct icmp6_hdr *) recv_pkt;
|
---|
639 |
|
---|
640 | type = icp->icmp6_type;
|
---|
641 | code = icp->icmp6_code;
|
---|
642 |
|
---|
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;
|
---|
649 |
|
---|
650 | hip = (struct ip6_hdr *)(icp + 1);
|
---|
651 | up = (struct udphdr *) (hip + 1);
|
---|
652 | nexthdr = hip->ip6_nxt;
|
---|
653 |
|
---|
654 | if (nexthdr == IPPROTO_FRAGMENT) {
|
---|
655 | nexthdr = *(unsigned char*)up;
|
---|
656 | up++;
|
---|
657 | }
|
---|
658 | if (nexthdr == IPPROTO_UDP) {
|
---|
659 | struct outdata6_t *pkt;
|
---|
660 |
|
---|
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 | }
|
---|
669 | }
|
---|
670 |
|
---|
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;
|
---|
702 | }
|
---|
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
|
---|
713 |
|
---|
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 | */
|
---|
719 | static void
|
---|
720 | print_inetname(const struct sockaddr *from)
|
---|
721 | {
|
---|
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);
|
---|
739 | }
|
---|
740 |
|
---|
741 | static void
|
---|
742 | print(int read_len, const struct sockaddr *from, const struct sockaddr *to)
|
---|
743 | {
|
---|
744 | print_inetname(from);
|
---|
745 |
|
---|
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 | }
|
---|
759 | }
|
---|
760 |
|
---|
761 | static void
|
---|
762 | print_delta_ms(unsigned t1p, unsigned t2p)
|
---|
763 | {
|
---|
764 | unsigned tt = t2p - t1p;
|
---|
765 | printf(" %u.%03u ms", tt / 1000, tt % 1000);
|
---|
766 | }
|
---|
767 |
|
---|
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)
|
---|
775 | {
|
---|
776 | int i;
|
---|
777 | int minpacket;
|
---|
778 | int tos = 0;
|
---|
779 | int max_ttl = 30;
|
---|
780 | int nprobes = 3;
|
---|
781 | int first_ttl = 1;
|
---|
782 | unsigned pausemsecs = 0;
|
---|
783 | char *source;
|
---|
784 | char *device;
|
---|
785 | char *tos_str;
|
---|
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;
|
---|
794 | int lsrr = 0;
|
---|
795 | #endif
|
---|
796 | #if ENABLE_TRACEROUTE6
|
---|
797 | sa_family_t af;
|
---|
798 | #else
|
---|
799 | enum { af = AF_INET };
|
---|
800 | #endif
|
---|
801 | int ttl;
|
---|
802 | int seq;
|
---|
803 | len_and_sockaddr *from_lsa;
|
---|
804 | struct sockaddr *lastaddr;
|
---|
805 | struct sockaddr *to;
|
---|
806 |
|
---|
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
|
---|
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
|
---|
816 | #endif
|
---|
817 | );
|
---|
818 | argv += optind;
|
---|
819 |
|
---|
820 | #if 0 /* IGNORED */
|
---|
821 | if (op & OPT_IP_CHKSUM)
|
---|
822 | bb_error_msg("warning: ip checksums disabled");
|
---|
823 | #endif
|
---|
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 | */
|
---|
837 | if (getuid() != 0)
|
---|
838 | bb_error_msg_and_die(bb_msg_you_must_be_root);
|
---|
839 | }
|
---|
840 | if (op & OPT_WAITTIME)
|
---|
841 | waittime = xatou_range(waittime_str, 1, 24 * 60 * 60);
|
---|
842 | if (op & OPT_PAUSE_MS)
|
---|
843 | pausemsecs = xatou_range(pausemsecs_str, 0, 60 * 60 * 1000);
|
---|
844 | if (op & OPT_FIRST_TTL)
|
---|
845 | first_ttl = xatou_range(first_ttl_str, 1, max_ttl);
|
---|
846 |
|
---|
847 | #if ENABLE_FEATURE_TRACEROUTE_SOURCE_ROUTE
|
---|
848 | if (source_route_list) {
|
---|
849 | while (source_route_list) {
|
---|
850 | len_and_sockaddr *lsa;
|
---|
851 |
|
---|
852 | if (lsrr >= NGATEWAYS)
|
---|
853 | bb_error_msg_and_die("no more than %d gateways", NGATEWAYS);
|
---|
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);
|
---|
857 | ++lsrr;
|
---|
858 | }
|
---|
859 | optlen = (lsrr + 1) * sizeof(gwlist[0]);
|
---|
860 | }
|
---|
861 | #endif
|
---|
862 |
|
---|
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);
|
---|
879 | #endif
|
---|
880 | packlen = minpacket;
|
---|
881 | if (argv[1])
|
---|
882 | packlen = xatoul_range(argv[1], minpacket, 32 * 1024);
|
---|
883 |
|
---|
884 | /* Ensure the socket fds won't be 0, 1 or 2 */
|
---|
885 | bb_sanitize_stdio();
|
---|
886 |
|
---|
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 | }
|
---|
904 |
|
---|
905 | #if TRACEROUTE_SO_DEBUG
|
---|
906 | if (op & OPT_DEBUG)
|
---|
907 | setsockopt(rcvsock, SOL_SOCKET, SO_DEBUG,
|
---|
908 | &const_int_1, sizeof(const_int_1));
|
---|
909 | #endif
|
---|
910 | if (op & OPT_BYPASS_ROUTE)
|
---|
911 | setsockopt(rcvsock, SOL_SOCKET, SO_DONTROUTE,
|
---|
912 | &const_int_1, sizeof(const_int_1));
|
---|
913 |
|
---|
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];
|
---|
930 |
|
---|
931 | /* final hop */
|
---|
932 | gwlist[lsrr] = dest_lsa->u.sin.sin_addr.s_addr;
|
---|
933 | ++lsrr;
|
---|
934 |
|
---|
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);
|
---|
944 |
|
---|
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 | }
|
---|
949 | }
|
---|
950 | #endif
|
---|
951 | }
|
---|
952 |
|
---|
953 | #ifdef SO_SNDBUF
|
---|
954 | if (setsockopt(sndsock, SOL_SOCKET, SO_SNDBUF, &packlen, sizeof(packlen)) < 0) {
|
---|
955 | bb_perror_msg_and_die("SO_SNDBUF");
|
---|
956 | }
|
---|
957 | #endif
|
---|
958 | #ifdef IP_TOS
|
---|
959 | if ((op & OPT_TOS) && setsockopt(sndsock, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0) {
|
---|
960 | bb_perror_msg_and_die("setsockopt tos %d", tos);
|
---|
961 | }
|
---|
962 | #endif
|
---|
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));
|
---|
967 | #endif
|
---|
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));
|
---|
972 | #endif
|
---|
973 | if (op & OPT_BYPASS_ROUTE)
|
---|
974 | setsockopt(sndsock, SOL_SOCKET, SO_DONTROUTE,
|
---|
975 | &const_int_1, sizeof(const_int_1));
|
---|
976 |
|
---|
977 | outip = xzalloc(packlen);
|
---|
978 |
|
---|
979 | ident = getpid();
|
---|
980 |
|
---|
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 | }
|
---|
990 | }
|
---|
991 |
|
---|
992 | if (op & OPT_DEVICE) /* hmm, do we need error check? */
|
---|
993 | setsockopt_bindtodevice(sndsock, device);
|
---|
994 |
|
---|
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);
|
---|
1011 | }
|
---|
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;
|
---|
1016 |
|
---|
1017 | int probe_fd = xsocket(af, SOCK_DGRAM, 0);
|
---|
1018 | if (op & OPT_DEVICE)
|
---|
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);
|
---|
1038 | }
|
---|
1039 | #endif
|
---|
1040 |
|
---|
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));
|
---|
1047 | if (op & OPT_SOURCE)
|
---|
1048 | printf(" from %s", source);
|
---|
1049 | printf(", %d hops max, %d byte packets\n", max_ttl, packlen);
|
---|
1050 |
|
---|
1051 | from_lsa = dup_sockaddr(dest_lsa);
|
---|
1052 | lastaddr = xzalloc(dest_lsa->len);
|
---|
1053 | to = xzalloc(dest_lsa->len);
|
---|
1054 | seq = 0;
|
---|
1055 | for (ttl = first_ttl; ttl <= max_ttl; ++ttl) {
|
---|
1056 | int probe;
|
---|
1057 | int unreachable = 0; /* counter */
|
---|
1058 | int gotlastaddr = 0; /* flags */
|
---|
1059 | int got_there = 0;
|
---|
1060 | int first = 1;
|
---|
1061 |
|
---|
1062 | printf("%2d", ttl);
|
---|
1063 | for (probe = 0; probe < nprobes; ++probe) {
|
---|
1064 | int read_len;
|
---|
1065 | unsigned t1;
|
---|
1066 | unsigned t2;
|
---|
1067 | struct ip *ip;
|
---|
1068 |
|
---|
1069 | if (!first && pausemsecs > 0)
|
---|
1070 | usleep(pausemsecs * 1000);
|
---|
1071 | fflush_all();
|
---|
1072 |
|
---|
1073 | t1 = monotonic_us();
|
---|
1074 | send_probe(++seq, ttl);
|
---|
1075 |
|
---|
1076 | first = 0;
|
---|
1077 | while ((read_len = wait_for_reply(from_lsa, to)) != 0) {
|
---|
1078 | t2 = monotonic_us();
|
---|
1079 | i = packet_ok(read_len, from_lsa, to, seq);
|
---|
1080 | /* Skip short packet */
|
---|
1081 | if (i == 0)
|
---|
1082 | continue;
|
---|
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;
|
---|
1090 | }
|
---|
1091 |
|
---|
1092 | print_delta_ms(t1, t2);
|
---|
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 |
|
---|
1099 | /* time exceeded in transit */
|
---|
1100 | if (i == -1)
|
---|
1101 | break;
|
---|
1102 | i--;
|
---|
1103 | switch (i) {
|
---|
1104 | #if ENABLE_TRACEROUTE6
|
---|
1105 | case ICMP6_DST_UNREACH_NOPORT << 8:
|
---|
1106 | got_there = 1;
|
---|
1107 | break;
|
---|
1108 | #endif
|
---|
1109 | case ICMP_UNREACH_PORT:
|
---|
1110 | if (ip->ip_ttl <= 1)
|
---|
1111 | printf(" !");
|
---|
1112 | got_there = 1;
|
---|
1113 | break;
|
---|
1114 |
|
---|
1115 | case ICMP_UNREACH_NET:
|
---|
1116 | #if ENABLE_TRACEROUTE6 && (ICMP6_DST_UNREACH_NOROUTE != ICMP_UNREACH_NET)
|
---|
1117 | case ICMP6_DST_UNREACH_NOROUTE << 8:
|
---|
1118 | #endif
|
---|
1119 | printf(" !N");
|
---|
1120 | ++unreachable;
|
---|
1121 | break;
|
---|
1122 | case ICMP_UNREACH_HOST:
|
---|
1123 | #if ENABLE_TRACEROUTE6
|
---|
1124 | case ICMP6_DST_UNREACH_ADDR << 8:
|
---|
1125 | #endif
|
---|
1126 | printf(" !H");
|
---|
1127 | ++unreachable;
|
---|
1128 | break;
|
---|
1129 | case ICMP_UNREACH_PROTOCOL:
|
---|
1130 | printf(" !P");
|
---|
1131 | got_there = 1;
|
---|
1132 | break;
|
---|
1133 | case ICMP_UNREACH_NEEDFRAG:
|
---|
1134 | printf(" !F-%d", pmtu);
|
---|
1135 | ++unreachable;
|
---|
1136 | break;
|
---|
1137 | case ICMP_UNREACH_SRCFAIL:
|
---|
1138 | #if ENABLE_TRACEROUTE6
|
---|
1139 | case ICMP6_DST_UNREACH_ADMIN << 8:
|
---|
1140 | #endif
|
---|
1141 | printf(" !S");
|
---|
1142 | ++unreachable;
|
---|
1143 | break;
|
---|
1144 | case ICMP_UNREACH_FILTER_PROHIB:
|
---|
1145 | case ICMP_UNREACH_NET_PROHIB: /* misuse */
|
---|
1146 | printf(" !A");
|
---|
1147 | ++unreachable;
|
---|
1148 | break;
|
---|
1149 | case ICMP_UNREACH_HOST_PROHIB:
|
---|
1150 | printf(" !C");
|
---|
1151 | ++unreachable;
|
---|
1152 | break;
|
---|
1153 | case ICMP_UNREACH_HOST_PRECEDENCE:
|
---|
1154 | printf(" !V");
|
---|
1155 | ++unreachable;
|
---|
1156 | break;
|
---|
1157 | case ICMP_UNREACH_PRECEDENCE_CUTOFF:
|
---|
1158 | printf(" !C");
|
---|
1159 | ++unreachable;
|
---|
1160 | break;
|
---|
1161 | case ICMP_UNREACH_NET_UNKNOWN:
|
---|
1162 | case ICMP_UNREACH_HOST_UNKNOWN:
|
---|
1163 | printf(" !U");
|
---|
1164 | ++unreachable;
|
---|
1165 | break;
|
---|
1166 | case ICMP_UNREACH_ISOLATED:
|
---|
1167 | printf(" !I");
|
---|
1168 | ++unreachable;
|
---|
1169 | break;
|
---|
1170 | case ICMP_UNREACH_TOSNET:
|
---|
1171 | case ICMP_UNREACH_TOSHOST:
|
---|
1172 | printf(" !T");
|
---|
1173 | ++unreachable;
|
---|
1174 | break;
|
---|
1175 | default:
|
---|
1176 | printf(" !<%d>", i);
|
---|
1177 | ++unreachable;
|
---|
1178 | break;
|
---|
1179 | }
|
---|
1180 | break;
|
---|
1181 | }
|
---|
1182 | /* there was no packet at all? */
|
---|
1183 | if (read_len == 0)
|
---|
1184 | printf(" *");
|
---|
1185 | }
|
---|
1186 | bb_putchar('\n');
|
---|
1187 | if (got_there
|
---|
1188 | || (unreachable > 0 && unreachable >= nprobes - 1)
|
---|
1189 | ) {
|
---|
1190 | break;
|
---|
1191 | }
|
---|
1192 | }
|
---|
1193 |
|
---|
1194 | return 0;
|
---|
1195 | }
|
---|
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 | }
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1209 | #endif
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