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dns(n) dns dns(n)
NAME
dns - Tcl Domain Name Service Client
SYNOPSIS
package require Tcl 8.2
package require dns ?1.0.1?
::dns::resolve query ?options?
::dns::configure ?options?
::dns::name token
::dns::address token
::dns::cname token
::dns::status token
::dns::error token
::dns::reset token
::dns::wait token
::dns::cleanup token
DESCRIPTION
The dns package provides a Tcl only Domain Name Service client. You should refer to RFC 1034 and RFC 1035 for information about the DNS
protocol or read resolver(3) to find out how the C library resolves domain names. The intention of this package is to insulate Tcl scripts
from problems with using the system library resolver for slow name servers. It may or may not be of practical use. The package also
extends the package uri to support DNS URIs or the form dns:what.host.com or dns://my.nameserver/what.host.com. The dns::resolve command
can handle DNS URIs or simple domain names as a query.
Note: This package uses TCP to query DNS servers as the tcl core does not implement UDP networking. This means that this module will not
work if DNS over TCP is blocked by a firewall, or not accepted by the chosen nameserver.
COMMANDS
::dns::resolve query ?options?
Resolve a domain name using the DNS protocol. query is the domain name to be lookup up. This should be either a fully qualified
domain name or a DNS URI.
-nameserver hostname or -server hostname
Specify an alternative name server for this request.
-protocol tcp|udp
Specify the network protocol to use for this request. Can be one of tcp or udp. However only tcp is currently implemented in
the package.
-port portnum
Specify an alternative port.
-search domainlist
-timeout milliseconds
Override the default timeout.
-type TYPE
Specify the type of DNS record you are interested in. Valid values are A, NS, MD MF, CNAME, SOA, MB, MG, MR, NULL, WKS, PTR,
HINFO, MINFO, MX, TXT, AXFR, MAILB, MAILA and *. See RFC1035 for details about the return values.
-class CLASS
Specify the class of domain name. This is usually IN but may be one of IN for internet domain names, CS, CH, HS or * for any
class.
-recurse boolean
Set to false if you do not want the name server to recursively act upon your request. Normally set to true.
-command procname
Set a procedure to be called upon request completion. The procedure will be passed the token as its only argument.
::dns::configure ?options?
The ::dns::configure command is used to setup the dns package. The server to query, the protocol and domain search path are all set
via this command. If no arguments are provided then a list of all the current settings is returned. If only one argument then it
must the the name of an option and the value for that option is returned.
-nameserver hostname
Set the default name server to be used by all queries. The default is localhost.
-protocol tcp|udp
Set the default network protocol to be used. Defaults to tcp.
-port portnum
Set the default port to use on the name server. The default is 53.
-search domainlist
Set the domain search list. This is currently not used.
-timeout milliseconds
Set the default timeout value for DNS lookups. Defaults to 30 seconds.
::dns::name token
Returns a list of all domain names returned as an answer to your query.
::dns::address token
Returns a list of the address records that match your query.
::dns::cname token
Returns a list of canonical names (usually just one) matching your query.
::dns::status token
Returns the status flag. For a successfully completed query this will be ok. May be error or timeout or eof. See also ::dns::error
::dns::error token
Returns the error message provided for requests whose status is error. If there is no error message then an empty string is
returned.
::dns::reset token
Reset or cancel a DNS query.
::dns::wait token
Wait for a DNS query to complete and return the status upon completion.
::dns::cleanup token
Remove all state variables associated with the request.
EXAMPLES
% set tok [dns::resolve www.tcl.tk]
::dns::1
% dns::status $tok
ok
% dns::address $tok
199.175.6.239
% dns::name $tok
www.tcl.tk
Using DNS URIs as queries:
% set tok [dns::resolve "dns:tcl.tk;type=MX"]
% set tok [dns::resolve "dns://l.root-servers.net/www.tcl.tk"]
SEE ALSO
resolver(5)
AUTHORS
Pat Thoyts
KEYWORDS
DNS, resolver, domain name service
dns 1.0.1 dns(n)