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1 perry 1 RESOLV+
2 !!!RESOLV+
3 NAME
4 DESCRIPTION
5 CONFIGURATION
6 ENVIRONMENT VARIABLES
7 FILES
8 BUGS
9 AUTHOR
10 SEE ALSO
11 ----
12 !!NAME
13
14
15 resolv+ - enhanced DNS resolver library
16 !!DESCRIPTION
17
18
19 ''Resolv+'' is a modified version of the standard
20 Berkeley BIND host resolver library. Enhancements include
21 support for host lookups via the Internet Domain Name System
22 (DNS), the ''/etc/hosts'' file, and Sun's Network
23 Information Service (NIS).
24
25
26 The programmer interface to the resolv+ routines is
27 identical to that of the standard resolver library. For
28 further information see the appropriate manual
29 pages.
30 !!CONFIGURATION
31
32
33 As with the standard resolver library, the file
34 ''/etc/resolv.conf'' must be set up before the resolver
35 can function. In addition, the file ''/etc/host.conf''
36 contains configuration information specific to
37 resolv+.
38
39
40 The ''host.conf'' file should contain one configuration
41 keyword per line, followed by appropriate configuration
42 information. The keywords recognized are ''order , trim ,
43 multi , nospoof ,'' and ''reorder .'' Each keyword is
44 described seperately below.
45
46
47 order
48
49
50 This keyword specifies how host lookups are to be performed.
51 It should be followed by one or more lookup methods,
52 seperated by commas. Valid methods are ''bind , hosts''
53 and ''nis .''
54
55
56 trim
57
58
59 This keyword may be listed more than once. Each time it
60 should be followed by a single domain name, with the leading
61 dot. When set, the resolv+ library will automatically trim
62 the given domain name from the end of any hostname resolved
63 via DNS. This is intended for use with local hosts and
64 domains. (Related note: trim will not affect hostnames
65 gathered via NIS or the hosts file. Care should be taken to
66 insure that the first hostname for each entry in the hosts
67 file is fully qualified or non-qualified, as appropriate for
68 the local installation.)
69
70
71 multi
72
73
74 Valid values are ''on'' and ''off .'' If set to
75 ''/etc/hosts''
76 file, instead of only the first. This is off by default, as
77 it may cause a substantial performance loss at sites with
78 large hosts files.
79
80
81 nospoof
82
83
84 Valid values are ''on'' and ''off .'' If set to
85 ''rlogin''
86 and ''rsh''. It works as follows: after performing a host
87 address lookup, resolv+ will perform a hostname lookup for
88 that address. If the two hostnames do not match, the query
89 will fail.
90
91
92 alert
93
94
95 If this option is set to
96 nospoof'' option is also set, resolv+ will log a
97 warning of the error via the ''syslog'' facility. The
98 default value is off.
99
100
101 reorder
102
103
104 Valid values are ''on'' and ''off .'' If set to
105 ''
106 !!ENVIRONMENT VARIABLES
107
108
109 The following environment variables may be set to override
110 resolv+'s configured behavior:
111
112
113 RESOLV_HOST_CONF
114
115
116 If set, it will override the default filename
117 (
118
119
120 RESOLV_SERV_ORDER
121
122
123 If set, will override the
124
125
126 RESOLV_SPOOF_CHECK
127
128
129 If set, will override the spoof check flag. Valid values are
130
131
132 RESOLV_ADD_TRIM_DOMAINS
133
134
135 If set, contains a list of domains to trim that will
136 augment, not supersede, the list in the host.conf
137 file.
138
139
140 RESOLV_OVERRIDE_TRIM_DOMAINS
141
142
143 If set, contains a list of domains to trim that will
144 override those in the host.conf file.
145
146
147 RESOLV_MULTI
148
149
150 If set, overrides the
151
152
153 RESOLV_REORDER
154
155
156 If set, overrides the
157 !!FILES
158
159
160 /etc/host.conf, /etc/hosts
161 !!BUGS
162
163
164 Quite possibly.
165 !!AUTHOR
166
167
168 The original BIND resolver library comes from the University
169 of California at Berkeley's Computer Science Research Group.
170 The original resolv+ modifications were made by Bill Wisner
171 !!SEE ALSO
172
173
174 resolver(3), resolver(5), hosts(5), hostname(7),
175 named(8)
176 ----
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