119 lines
3.8 KiB
Groff
119 lines
3.8 KiB
Groff
.TH "unbound\-host" "1" "Jun 17, 2019" "NLnet Labs" "unbound 1.9.2"
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.\"
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.\" unbound-host.1 -- unbound DNS lookup utility
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.\"
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.\" Copyright (c) 2007, NLnet Labs. All rights reserved.
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.\"
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.\" See LICENSE for the license.
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.\"
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.\"
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.SH "NAME"
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.B unbound\-host
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\- unbound DNS lookup utility
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.SH "SYNOPSIS"
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.B unbound\-host
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.RB [ \-C
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.IR configfile ]
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.RB [ \-vdhr46D ]
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.RB [ \-c
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.IR class ]
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.RB [ \-t
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.IR type ]
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.RB [ \-y
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.IR key ]
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.RB [ \-f
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.IR keyfile ]
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.RB [ \-F
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.IR namedkeyfile ]
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.I hostname
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.SH "DESCRIPTION"
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.B Unbound\-host
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uses the unbound validating resolver to query for the hostname and display
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results. With the \fB\-v\fR option it displays validation
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status: secure, insecure, bogus (security failure).
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.P
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By default it reads no configuration file whatsoever. It attempts to reach
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the internet root servers. With \fB\-C\fR an unbound config file and with
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\fB\-r\fR resolv.conf can be read.
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.P
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The available options are:
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.TP
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.I hostname
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This name is resolved (looked up in the DNS).
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If a IPv4 or IPv6 address is given, a reverse lookup is performed.
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.TP
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.B \-h
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Show the version and commandline option help.
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.TP
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.B \-v
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Enable verbose output and it shows validation results, on every line.
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Secure means that the NXDOMAIN (no such domain name), nodata (no such data)
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or positive data response validated correctly with one of the keys.
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Insecure means that that domain name has no security set up for it.
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Bogus (security failure) means that the response failed one or more checks,
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it is likely wrong, outdated, tampered with, or broken.
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.TP
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.B \-d
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Enable debug output to stderr. One \-d shows what the resolver and validator
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are doing and may tell you what is going on. More times, \-d \-d, gives a
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lot of output, with every packet sent and received.
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.TP
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.B \-c \fIclass
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Specify the class to lookup for, the default is IN the internet class.
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.TP
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.B \-t \fItype
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Specify the type of data to lookup. The default looks for IPv4, IPv6 and
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mail handler data, or domain name pointers for reverse queries.
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.TP
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.B \-y \fIkey
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Specify a public key to use as trust anchor. This is the base for a chain
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of trust that is built up from the trust anchor to the response, in order
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to validate the response message. Can be given as a DS or DNSKEY record.
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For example \-y "example.com DS 31560 5 1 1CFED84787E6E19CCF9372C1187325972FE546CD".
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.TP
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.B \-D
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Enables DNSSEC validation. Reads the root anchor from the default configured
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root anchor at the default location, \fI/var/unbound/root.key\fR.
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.TP
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.B \-f \fIkeyfile
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Reads keys from a file. Every line has a DS or DNSKEY record, in the format
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as for \-y. The zone file format, the same as dig and drill produce.
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.TP
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.B \-F \fInamedkeyfile
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Reads keys from a BIND\-style named.conf file. Only the trusted\-key {}; entries
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are read.
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.TP
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.B \-C \fIconfigfile
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Uses the specified unbound.conf to prime
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.IR libunbound (3).
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Pass it as first argument if you want to override some options from the
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config file with further arguments on the commandline.
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.TP
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.B \-r
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Read /etc/resolv.conf, and use the forward DNS servers from there (those could
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have been set by DHCP). More info in
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.IR resolv.conf (5).
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Breaks validation if those servers do not support DNSSEC.
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.TP
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.B \-4
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Use solely the IPv4 network for sending packets.
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.TP
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.B \-6
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Use solely the IPv6 network for sending packets.
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.SH "EXAMPLES"
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Some examples of use. The keys shown below are fakes, thus a security failure
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is encountered.
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.P
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$ unbound\-host www.example.com
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.P
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$ unbound\-host \-v \-y "example.com DS 31560 5 1 1CFED84787E6E19CCF9372C1187325972FE546CD" www.example.com
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.P
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$ unbound\-host \-v \-y "example.com DS 31560 5 1 1CFED84787E6E19CCF9372C1187325972FE546CD" 192.0.2.153
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.SH "EXIT CODE"
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The unbound\-host program exits with status code 1 on error,
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0 on no error. The data may not be available on exit code 0, exit code 1
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means the lookup encountered a fatal error.
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.SH "SEE ALSO"
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\fIunbound.conf\fR(5),
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\fIunbound\fR(8).
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