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-.\" $Id: dnsquery.1,v 8.5 2002/06/18 02:04:54 marka Exp $
-.\"
-.\"Copyright (c) 1995,1996,1999 by Internet Software Consortium
-.\"
-.\"Permission to use, copy, modify, and distribute this software for any
-.\"purpose with or without fee is hereby granted, provided that the above
-.\"copyright notice and this permission notice appear in all copies.
-.\"
-.\"THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
-.\"ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
-.\"OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
-.\"CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
-.\"DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
-.\"PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
-.\"ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
-.\"SOFTWARE.
-.\"
-.Dd March 10, 1990
-.Dt DNSQUERY @CMD_EXT_U@
-.Os BSD 4
-.Sh NAME
-.Nm dnsquery
-.Nd query domain name servers using resolver
-.Sh SYNOPSIS
-.Nm dnsquery
-.Op Fl n Ar nameserver
-.Op Fl t Ar type
-.Op Fl c Ar class
-.Op Fl r Ar retry
-.Op Fl p Ar period
-.Op Fl d
-.Op Fl s
-.Op Fl v
-.Ar host
-.Sh DESCRIPTION
-The
-.Ic dnsquery
-program is a general interface to nameservers via
-BIND resolver library calls. The program supports
-queries to the nameserver with an opcode of QUERY.
-This program is intended to be a replacement or
-supplement to programs like nstest, nsquery and
-nslookup. All arguments except for
-.Ar host
-and
-.Ar nameserver
-are treated without case-sensitivity.
-.Sh OPTIONS
-.Bl -tag -width Fl
-.It Fl n Ar nameserver
-The nameserver to be used in the query. Nameservers can appear as either
-Internet addresses of the form
-.Ar ( w.x.y.z
-or
-.Ar xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx )
-or can appear as domain names.
-(Default: as specified in
-.Pa /etc/resolv.conf . )
-.It Fl t Ar type
-The type of resource record of interest. Types include:
-.Bl -tag -width "AFSDB " -compact -offset indent
-.It Ar A
-address
-.It Ar NS
-nameserver
-.It Ar CNAME
-canonical name
-.It Ar PTR
-domain name pointer
-.It Ar SOA
-start of authority
-.It Ar WKS
-well-known service
-.It Ar HINFO
-host information
-.It Ar MINFO
-mailbox information
-.It Ar MX
-mail exchange
-.It Ar RP
-responsible person
-.It Ar MG
-mail group member
-.It Ar AFSDB
-DCE or AFS server
-.It Ar ANY
-wildcard
-.El
-.Pp
-Note that any case may be used. (Default:
-.Ar ANY . )
-.It Fl c Ar class
-The class of resource records of interest.
-Classes include:
-.Bl -tag -width "CHAOS " -compact -offset indent
-.It Ar IN
-Internet
-.It Ar HS
-Hesiod
-.It Ar CHAOS
-Chaos
-.It Ar ANY
-wildcard
-.El
-.Pp
-Note that any case may be used. (Default:
-.Ar IN . )
-.It Fl r Ar retry
-The number of times to retry if the nameserver is
-not responding. (Default: 4.)
-.It Fl p Ar period
-Period to wait before timing out. (Default:
-.Dv RES_TIMEOUT . )
-.It Fl d
-Turn on debugging. This sets the
-.Dv RES_DEBUG
-bit of the resolver's
-.Ft options
-field. (Default: no debugging.)
-.It Fl s
-Use a
-.Em stream
-rather than a packet. This uses a TCP stream connection with
-the nameserver rather than a UDP datagram. This sets the
-.Dv RES_USEVC
-bit of the resolver's
-.Ft options
-field. (Default: UDP datagram.)
-.It Fl v
-Synonym for the
-.Dq Fl s
-flag.
-.It Ar host
-The name of the host (or domain) of interest.
-.El
-.Sh FILES
-.Bl -tag -width "<arpa/nameser.h> " -compact
-.It Pa /etc/resolv.conf
-to get the default ns and search lists
-.It Pa <arpa/nameser.h>
-list of usable RR types and classes
-.It Pa <resolv.h>
-list of resolver flags
-.El
-.Sh DIAGNOSTICS
-If the resolver fails to answer the query and debugging has not been
-turned on,
-.Ic dnsquery
-will simply print a message like:
-.Dl Query failed (rc = 1) : Unknown host
-.Pp
-The value of the return code is supplied by
-.Ft h_errno .
-.Sh SEE ALSO
-.Xr nslookup @SYS_OPS_EXT@ ,
-.Xr nstest @CMD_EXT@ ,
-.Xr nsquery @CMD_EXT@ ,
-.Xr named @SYS_OPS_EXT@ ,
-.Xr resolver @FORMAT_EXT@ .
-.Sh AUTHOR
-Bryan Beecher
-.Sh BUGS
-Queries of a class other than
-.Ar IN
-can have interesting results
-since ordinarily a nameserver only has a list of root nameservers
-for class
-.Ar IN
-resource records.
-.Pp
-.Ic Dnsquery
-uses a call to
-.Fn inet_addr
-to determine if the argument
-for the
-.Dq Fl n
-option is a valid Internet address. Unfortunately,
-.Fn inet_addr
-seems to cause a segmentation fault with some (bad)
-IP addresses (e.g., 1.2.3.4.5).