You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
195 lines
4.9 KiB
195 lines
4.9 KiB
.\" dnsget.1: dnsget manpage
|
|
.\"
|
|
.\" Copyright (C) 2005-2014 Michael Tokarev <mjt+udns@tls.msk.ru>
|
|
.\" This file is part of UDNS library, an async DNS stub resolver.
|
|
.\"
|
|
.\" This library is free software; you can redistribute it and/or
|
|
.\" modify it under the terms of the GNU Lesser General Public
|
|
.\" License as published by the Free Software Foundation; either
|
|
.\" version 2.1 of the License, or (at your option) any later version.
|
|
.\"
|
|
.\" This library is distributed in the hope that it will be useful,
|
|
.\" but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
.\" MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
.\" Lesser General Public License for more details.
|
|
.\"
|
|
.\" You should have received a copy of the GNU Lesser General Public
|
|
.\" License along with this library, in file named COPYING.LGPL; if not,
|
|
.\" write to the Free Software Foundation, Inc., 59 Temple Place,
|
|
.\" Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
.TH dnsget 1 "Jan 2014" "User Utilities"
|
|
|
|
.SH NAME
|
|
dnsget \- DNS lookup utility
|
|
|
|
.SH SYNOPSYS
|
|
.B dnsget
|
|
.RB [\| \-v \||\| \-q \|]
|
|
.RB [\| \-c
|
|
.IR class \|]
|
|
.RB [\| \-t
|
|
.IR type \|]
|
|
.RB [\| \-o
|
|
.IR opt , opt ,...]
|
|
.IR name \|.\|.\|.
|
|
|
|
.SH DESCRIPTION
|
|
.B dnsget
|
|
is a simple command-line to perform DNS lookups, similar to
|
|
.BR host (1)
|
|
and
|
|
.BR dig (1).
|
|
It is useable for both interactive/debugging scenarious and
|
|
in scripts.
|
|
The program is implemented using
|
|
.BR udns (3)
|
|
library.
|
|
|
|
.PP
|
|
By default,
|
|
.B dnsget
|
|
produces a human-readable output, similar to
|
|
.RS
|
|
.nf
|
|
alias.example.com. CNAME www.example.com.
|
|
www.example.com. A 192.168.1.1
|
|
www.example.com. MX 10 mx.example.com.
|
|
.fi
|
|
.RE
|
|
which is just sufficient to see how a given name resolves.
|
|
Output format is controllable with
|
|
.B \-v
|
|
and
|
|
.B \-q
|
|
options -- the former increases verbosity level up to printing
|
|
the whole DNS contents of all packets sent and received, which
|
|
is suitable for debugging DNS problems, while the latter reduces
|
|
the level, making output more quiet, up to bare result with no
|
|
error messages, which is good for scripts.
|
|
|
|
.SH OPTIONS
|
|
|
|
The following options are recognized by
|
|
.BR dnsget :
|
|
|
|
.TP
|
|
.B \-v
|
|
produce more detailed output. More
|
|
.BR \-v 's
|
|
means more details will be produced. With single
|
|
.BR \-v , dnsget
|
|
will print contents of all received DNS packets (in a readable format),
|
|
while with
|
|
.BR \-vv ,
|
|
it will output all outgoing DNS packets too.
|
|
|
|
.TP
|
|
.B \-q
|
|
the opposite for \fB\-v\fR -- produce less detailed output.
|
|
With single
|
|
.BR \-q , dnsget
|
|
will only show (decoded) data from final DNS resource records (RR),
|
|
while
|
|
.B \-qq
|
|
also suppresses error messages.
|
|
|
|
.TP
|
|
\fB\-t \fItype\fR
|
|
request record(s) of the given type \fItype\fR. By default,
|
|
.B dnsget
|
|
will ask for IPv4 address (A) record, or for PTR record if the
|
|
argument in question is an IPv4 or IPv6 address. Recognized
|
|
types include A, AAAA, MX, TXT, CNAME, PTR, NS, SOA, ANY and
|
|
others.
|
|
|
|
.TP
|
|
\fB\-c \fIclass\fR
|
|
request DNS record(s) of the given class \fIclass\fR. By
|
|
default
|
|
.B dnsget
|
|
uses IN class. Valid classes include IN, CH, HS, ANY.
|
|
|
|
.TP
|
|
.B \-a
|
|
(compatibility option). Equivalent to setting query type to
|
|
.B ANY
|
|
and increasing verbosity level
|
|
.RB ( \-v ).
|
|
|
|
.TP
|
|
.B \-C
|
|
(planned)
|
|
|
|
.TP
|
|
.B \-x
|
|
(planned)
|
|
|
|
.TP
|
|
\fB\-o \fIopt\fR,\fIopt\fR,...
|
|
(may be specified several times).
|
|
Set resolver options (in a form \fIoption\fR:\fIvalue\fR) as if they
|
|
were set in
|
|
.RB $ RES_OPTIONS
|
|
environment variable, or set query flags:
|
|
.RS
|
|
.TP
|
|
\fBtimeout\fR:\fIsec\fR
|
|
Set initial query timeout to \fIsec\fR.
|
|
.TP
|
|
\fBattempts\fR:\fInum\fR
|
|
(re)try every query \fInum\fR times before failing.
|
|
.TP
|
|
\fBudpbuf\fR:\fIbytes\fR
|
|
set DNS UDP buffer size to \fIbytes\fR bytes. Valid values
|
|
are from 512 to 65535. If \fIbytes\fR is greather than 512,
|
|
EDNS0 (RFC 2671) extensions will be used.
|
|
.TP
|
|
\fBport\fR:\fInum\fR
|
|
Use given UDP port number \fInum\fR instead of the default port 53 (domain).
|
|
.TP
|
|
\fBaa\fR
|
|
set AA (auth only) query bit.
|
|
.TP
|
|
\fBnord\fR
|
|
do not set RD (recursion desired) query bit (set by default).
|
|
.TP
|
|
\fBdnssec\fR or \fBdo\fR
|
|
set DNSSEC OK (DO) query flag (\fBdnsget\fR does not verify DNSSEC signatures,
|
|
only displays them; this is set in EDNS RR).
|
|
.TP
|
|
\fBcd\fR
|
|
set CD (checking disabled) query bit.
|
|
.RE
|
|
|
|
.TP
|
|
\fB\-n \fInameserver\fR
|
|
Use the given nameserver(s) (may be specified more than once)
|
|
instead of the default. Using this option has the same same effect as
|
|
.RB $ NSCACHEIP
|
|
or
|
|
.RB $ NAMESERVERS
|
|
environment variables, with the only difference that only IPv4 addresses
|
|
are recognized for now, and it is possible to specify names (which will
|
|
be resolved using default settings) instead of IP addresses.
|
|
|
|
.TP
|
|
.B \-h
|
|
print short help and exit.
|
|
|
|
.SH "RETURN VALUE"
|
|
When all names where resovled successefully,
|
|
.B dnsget
|
|
exits with zero exit status. If at least one name was not found,
|
|
.B dnsget
|
|
will exit with return code 100. If some other error occured during
|
|
name resolution, it will exit with code 99. In case of usage or
|
|
initialization error,
|
|
.B dnsget
|
|
will return 1.
|
|
|
|
.SH "SEE ALSO"
|
|
.BR host (1)
|
|
.BR dig (1)
|
|
.BR resolv.conf (5)
|
|
.BR udns (3).
|