2 .\" Title: resolv_wrapper
3 .\" Author: [FIXME: author] [see http://docbook.sf.net/el/author]
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10 .TH "RESOLV_WRAPPER" "1" "2015\-08\-18" "\ \&" "\ \&"
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12 .\" * Define some portability stuff
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15 .\" http://bugs.debian.org/507673
16 .\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
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31 resolv_wrapper \- A wrapper for dns name resolving or dns faking\&.
34 LD_PRELOAD=libresolv_wrapper\&.so RESOLV_WRAPPER_CONF="/path/to/resolv\&.conf" \fB\&./myapplication\fR
37 resolv_wrapper makes it possible on most UNIX platforms to contact your own DNS implementation in your test environment\&. It requires socket_wrapper to be able to contact it\&. If it doesn\(cqt work on a special platform the wrapper is able to fake DNS queries and return valid responses to your application\&.
47 Redirects name queries to the nameservers specified in your resolv\&.conf
58 Can fake DNS queries using a simple formatted DNS hosts file\&.
60 .SH "ENVIRONMENT VARIABLES"
62 \fBRESOLV_WRAPPER_CONF\fR
64 This is used to specify the resolv\&.conf to use\&. The format of the resolv\&.conf file is defined in the manpage
65 \fIresolv\&.conf(5)\fR\&. Currently only the
67 directive is supported\&.
70 \fBRESOLV_WRAPPER_HOSTS\fR
72 This environment variable is used for faking DNS queries\&. It must point to a hosts\-like text file that specifies fake records for custom queries\&. The format of the file looks like this:
78 TYPE RECORD_NAME RECORD_VALUE
91 A dc\&.cwrap\&.org 127\&.0\&.0\&.10
92 AAAA dc\&.cwrap\&.org fd00::5357:5f0a
93 CNAME kerberos\&.cwrap\&.org dc\&.cwrap\&.org
94 SRV _kerberos\&._tcp\&.cwrap\&.org kerberos\&.cwrap\&.org 88
100 \fBRESOLV_WRAPPER_DEBUGLEVEL\fR
102 If you need to see what is going on in resolv_wrapper itself or try to find a bug, you can enable logging support in resolv_wrapper if you built it with debug symbols\&.
150 The following command would trick \fIkinit(1)\fR into using DNS servers from "\&./resolv\&.conf" for Kerberos service resolution:
156 $ LD_PRELOAD=libresolv_wrapper\&.so RESOLV_WRAPPER_CONF="\&./resolv\&.conf" kinit user@EXAMPLE\&.COM