164 lines
3.0 KiB
Groff
164 lines
3.0 KiB
Groff
.TH DNSQUERY 1 "10 March 1990"
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.UC 6
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.SH NAME
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dnsquery \- query domain name servers using resolver
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.SH SYNOPSIS
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.B dnsquery
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[-n
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.I nameserver]
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[-t
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.I type]
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[-c
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.I class]
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[-r
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.I retry]
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[-p
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.I retry period]
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[-d] [-s] [-v] host
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.SH DESCRIPTION
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The
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.IR dnsquery
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program is a general interface to nameservers via
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BIND resolver library calls. The program supports
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queries to the nameserver with an opcode of QUERY.
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This program is intended to be a replacement or
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supplement to programs like nstest, nsquery and
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nslookup. All arguments except for
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.IR host
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and
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.IR ns
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are treated without case-sensitivity.
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.SH OPTIONS
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.TP 1i
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.B \-n
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The nameserver to be used in the query. Nameservers can appear as either
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Internet addresses of the form w.x.y.z or can appear as domain names.
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(default: as specified in /etc/resolv.conf)
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.TP 1i
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.B \-t
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The type of resource record of interest. Types include:
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.RS 1.5i
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.TP 1i
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A
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address
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.PD 0
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.TP 1i
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NS
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nameserver
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.TP 1i
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CNAME
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canonical name
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.TP 1i
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PTR
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domain name pointer
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.TP 1i
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SOA
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start of authority
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.TP 1i
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WKS
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well-known service
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.TP 1i
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HINFO
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host information
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.TP 1i
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MINFO
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mailbox information
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.TP 1i
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MX
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mail exchange
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.TP 1i
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RP
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responsible person
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.TP 1i
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MG
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mail group member
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.TP 1i
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AFSDB
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DCE or AFS server
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.TP 1i
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ANY
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wildcard
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.RE
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.PD
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.IP
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Note that any case may be used. (default: ANY)
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.TP 1i
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.B \-c
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The class of resource records of interest.
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Classes include:
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.RS 2i
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.TP 1i
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IN
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Internet
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.PD 0
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.TP 1i
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HS
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Hesiod
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.TP 1i
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CHAOS
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Chaos
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.TP 1i
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ANY
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wildcard
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.RE
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.PD
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.IP
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Note that any case may be used. (default: IN)
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.TP 1i
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.B \-r
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The number of times to retry if the nameserver is
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not responding. (default: 4)
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.TP 1i
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.B \-p
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Period to wait before timing out. (default: RES_TIMEOUT)
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.IR options
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field. (default: any answer)
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.TP 1i
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.B \-d
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Turn on debugging. This sets the RES_DEBUG bit of the resolver's
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.IR options
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field. (default: no debugging)
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.TP 1i
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.B \-s
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Use a
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.IR stream
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rather than a packet. This uses a TCP stream connection with
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the nameserver rather than a UDP datagram. This sets the
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RES_USEVC bit of the resolver's
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.IR options
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field. (default: UDP)
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.TP 1i
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.B \-v
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Synonym for the 's' flag.
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.TP 1i
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.B host
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The name of the host (or domain) of interest.
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.SH FILES
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/etc/resolv.conf to get the default ns and search lists
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.br
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<arpa/nameser.h> list of usable RR types and classes
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.br
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<resolv.h> list of resolver flags
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.SH "SEE ALSO"
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nslookup(8), named(8), resolver(5)
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.SH DIAGNOSTICS
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If the resolver fails to answer the query and debugging has not been
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turned on,
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.IR dnsquery
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will simply print a message like:
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.TP 1i
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Query failed (rc = 1) : Unknown host
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.LP
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The value of the return code is supplied by h_errno.
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.SH BUGS
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Queries of a class other than IN can have interesting results
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since ordinarily a nameserver only has a list of root nameservers
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for class IN resource records.
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.PP
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Query uses a call to inet_addr() to determine if the argument
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for the '-n' option is a valid Internet address. Unfortunately,
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inet_addr() seems to cause a segmentation fault with some (bad)
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addresses (e.g. 1.2.3.4.5).
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.SH AUTHOR
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Bryan Beecher
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