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1 | .\" Copyright (c) 1983 Regents of the University of California. |
2 | .\" All rights reserved. The Berkeley software License Agreement | |
3 | .\" specifies the terms and conditions for redistribution. | |
4 | .\" | |
0479c228 | 5 | .\" @(#)htable.8 6.3 (Berkeley) %G% |
4ee2fd4d | 6 | .\" |
bfd81b5b | 7 | .TH HTABLE 8 "" |
4ee2fd4d KM |
8 | .UC 5 |
9 | .SH NAME | |
10 | htable \- convert NIC standard format host tables | |
11 | .SH SYNOPSIS | |
12 | .B /etc/htable | |
13 | [ | |
14 | .B \-c | |
15 | .I connected-nets | |
16 | ] [ | |
17 | .B \-l | |
18 | .I local-nets | |
19 | ] | |
20 | .I file | |
21 | .SH DESCRIPTION | |
22 | .I Htable | |
23 | is used to convert host files in the format specified | |
24 | in Internet RFC 810 to the format used by the network | |
25 | library routines. Three files are created as a result | |
26 | of running | |
27 | .IR htable : | |
28 | .IR hosts , | |
29 | .IR networks , | |
30 | and | |
31 | .IR gateways . | |
32 | The | |
33 | .I hosts | |
0479c228 | 34 | file may be used by the |
a96bccf5 | 35 | .IR gethostbyname (3N) |
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36 | routines in mapping host names to addresses |
37 | if the nameserver, | |
38 | .IR named (8), | |
39 | is not used. | |
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40 | The |
41 | .I networks | |
42 | file is used by the | |
43 | .IR getnetent (3N) | |
44 | routines in mapping network names to numbers. | |
45 | The | |
46 | .I gateways | |
0479c228 | 47 | file may be used by the routing daemon |
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48 | in identifying ``passive'' Internet gateways; |
49 | see | |
50 | .IR routed (8C) | |
51 | for an explanation. | |
52 | .PP | |
53 | If any of the files | |
54 | .IR localhosts , | |
55 | .IR localnetworks , | |
56 | or | |
57 | .I localgateways | |
58 | are present in the current directory, | |
59 | the file's contents is prepended to the | |
60 | output file. | |
61 | Of these, only the gateways file is interpreted. | |
62 | This allows sites to maintain local aliases and | |
63 | entries which are not normally present in the | |
64 | master database. | |
65 | Only one gateway to each network will be placed in the gateways file; | |
66 | a gateway listed in the localgateways file will override any in the | |
67 | input file. | |
68 | .PP | |
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69 | If the gateways file is to be used, |
70 | a list of networks to which the host is directly connected | |
71 | is specified with the | |
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72 | .B \-c |
73 | flag. | |
74 | The networks, separated by commas, | |
0479c228 | 75 | may be given by name or in Internet-standard dot notation, |
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76 | e.g. |
77 | .B \-c | |
78 | arpanet,128.32,local-ether-net. | |
79 | .I Htable | |
80 | only includes gateways | |
81 | which are directly connected to one of the networks specified, | |
82 | or which can be reached from another gateway on a connected net. | |
83 | .PP | |
84 | If the | |
85 | .B \-l | |
86 | option is given with a list of networks (in the same format as for | |
87 | .BR \-c ), | |
88 | these networks will be treated as ``local,'' | |
89 | and information about hosts on local networks is | |
90 | taken only from the localhosts file. | |
91 | Entries for local hosts from the main database will be omitted. | |
92 | This allows the localhosts file to completely override | |
93 | any entries in the input file. | |
94 | .PP | |
95 | .I Htable | |
96 | is best used in conjunction with the | |
97 | .IR gettable (8C) | |
98 | program which retrieves the NIC database from a host. | |
99 | .SH "SEE ALSO" | |
100 | intro(3N), | |
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101 | gettable(8C), |
102 | named(8) | |
103 | .SH BUGS | |
104 | If the name-domain system provided network name mapping well as host | |
105 | name mapping, | |
106 | .I htable | |
107 | would no longer be needed. |