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dnsquery (1)
  • dnsquery (1) ( Русские man: Команды и прикладные программы пользовательского уровня )
  • >> dnsquery (1) ( Linux man: Команды и прикладные программы пользовательского уровня )

  • BSD mandoc
    BSD 4  

    NAME

    dnsquery 
    
     - query domain name servers using resolver
    
     
    

    SYNOPSIS

    dnsquery [-n nameserver ] [-t type ] [-c class ] [-r retry ] [-p period ] [-d ] [-s ] [-v ] host  

    DESCRIPTION

    The 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 host and nameserver are treated without case-sensitivity.  

    OPTIONS

    -n nameserver
    The nameserver to be used in the query. Nameservers can appear as either Internet addresses of the form w.x.y.z or can appear as domain names. (Default: as specified in /etc/resolv.conf . )
    -t type
    The type of resource record of interest. Types include:

    A
    address
    NS
    nameserver
    CNAME
    canonical name
    PTR
    domain name pointer
    SOA
    start of authority
    WKS
    well-known service
    HINFO
    host information
    MINFO
    mailbox information
    MX
    mail exchange
    RP
    responsible person
    MG
    mail group member
    AFSDB
    DCE or AFS server
    ANY
    wildcard

    Note that any case may be used. (Default: ANY .

    -c class
    The class of resource records of interest. Classes include:

    IN
    Internet
    HS
    Hesiod
    CHAOS
    Chaos
    ANY
    wildcard

    Note that any case may be used. (Default: IN .

    -r retry
    The number of times to retry if the nameserver is not responding. (Default: 4.)
    -p period
    Period to wait before timing out. (Default: RES_TIMEOUT .
    -d
    Turn on debugging. This sets the RES_DEBUG bit of the resolver's options field. (Default: no debugging.)
    -s
    Use a stream rather than a packet. This uses a TCP stream connection with the nameserver rather than a UDP datagram. This sets the RES_USEVC bit of the resolver's options field. (Default: UDP datagram.)
    -v
    Synonym for the ``-s '' flag.
    host
    The name of the host (or domain) of interest.

     

    FILES

    /etc/resolv.conf
    to get the default ns and search lists
    <arpa/nameser.h>
    list of usable RR types and classes
    <resolv.h>
    list of resolver flags

     

    DIAGNOSTICS

    If the resolver fails to answer the query and debugging has not been turned on, dnsquery will simply print a message like:
    Query failed (rc = 1) : Unknown host

    The value of the return code is supplied by h_errno .  

    SEE ALSO

    nslookup(8), nstest(1), nsquery(1), named(8), resolver(5).  

    AUTHOR

    Bryan Beecher  

    BUGS

    Queries of a class other than IN can have interesting results since ordinarily a nameserver only has a list of root nameservers for class IN resource records.

    Dnsquery uses a call to inet_addr ();
    to determine if the argument for the ``-n '' option is a valid Internet address. Unfortunately, inet_addr ();
    seems to cause a segmentation fault with some (bad) IP addresses (e.g., 1.2.3.4.5).


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    FILES
    DIAGNOSTICS
    SEE ALSO
    AUTHOR
    BUGS


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