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NAME

       lwdnsq - lookup items in DNS to help pluto (and others)

SYNOPSIS

       ipsec lwdnsq [--prompt] [--serial] [--debug] [--log logfile]
             [--regress] [--ignoreeof]

DESCRIPTION

       The ipsec lwdnsq is a helper program that does DNS lookups for other
       programs. It implements an asynchronous interface on stdin/stdout, with
       an ASCII driven command language.

       If stdin is a tty or if the --prompt option is given, then it issues a
       prompt to the user. Otherwise, it is silent, except for results.

       The program will accept multiple queries concurrently, with each result
       being marked with the ID provided on the output. The IDs are strings.

       If the --serial option is given, then the program will not attempt to
       execute concurrent queries, but will serialize all input and output.

QUERY LANGUAGE

       There are twelve commands that the program understands. This is to
       lookup different types of records in both the forward and reverse maps.
       Every query includes a queryid, which is returned in the output, on
       every single line to identify the transaction.

   HELP
       This request lists the available commands

   QUIT
       This request causes lwdnsq to quit.

   DEBUG
       This request enables debugging.

   KEY queryid FQDN
       This request looks up the KEY resource record for the given FQDN..

   KEY4 queryid A.B.C.D
       This request looks up the KEY resource record found in the reverse map
       for the IP version 4 address A.B.C.D, i.e. it looks up
       D.C.B.A.in-addr.arpa.

   KEY6 queryid A:B::C:D
       This request looks up the KEY resource record found in the reverse map
       for the IPv6 address A:B::C:D, i.e. it looks the 32-nibble long entry
       in ip6.arpa (and ip6.int).

   TXT queryid A.B.C.D
       This request looks up the TXT resource record found[?]

   TXT4 queryid A.B.C.D
       This request looks up the TXT resource record found in the reverse map
       for the IP version 4 address A.B.C.D, i.e. it looks up
       D.C.B.A.in-addr.arpa.

   TXT6 queryid A:B::C:D
       This request looks up the TXT resource record found in the reverse map
       for the IPv6 address A:B::C:D, i.e. it looks the 32-nibble long entry
       in ip6.arpa (and ip6.int).

   KEY queryid FQDN
       This request looks up the IPSECKEY resource record for the given FQDN..
       See note about IPSECKEY processing, below.

   IPSECKEY queryid A.B.C.D
       This request looks up the IPSECKEY resource record found in the reverse
       map[?]

   IPSECKEY4 queryid A.B.C.D
       This request looks up the IPSECKEY resource record found in the reverse
       map for the IP version 4 address A.B.C.D, i.e. it looks up
       D.C.B.A.in-addr.arpa. See special note about IPSECKEY processing,
       below.

   IPSECKEY6 queryid A:B::C:D
       This request looks up the IPSECKEY resource record found in the reverse
       map for the IPv6 address A:B::C:D, i.e. it looks the 32-nibble long
       entry in ip6.arpa (and ip6.int). See special note about IPSECKEY
       processing, below.

   OE4 queryid A.B.C.D
       This request looks an appropriate record for Opportunistic Encryption
       for the given IP address. This attempts to look for the delegation
       record. This may be one of IPSECKEY, KEY, or TXT record. Unless
       configured otherwise, (see OE4 Directives, below), then a query type of
       ANY will be used to retrieve all relevant records, and all will be
       returned.

   OE6 queryid A:B::C:D
       This request looks an appropriate record for Opportunistic Encryption
       for the given IPv6 address. This attempts to look for the delegation
       record. This may be one of IPSECKEY, KEY, or TXT record. Unless
       configured otherwise, (see OE Directives, below), then a query type of
       ALL will be used to retrieve all relevant records, and all will be
       returned. i.e. it looks the 32-nibble long entry in ip6.arpa (and
       ip6.int).

   A queryid FQDN
       This request looks up the A (IPv4) resource record for the given FQDN..

   AAAA queryid FQDN
       This request looks up the AAAA (IPv6) resource record for the given
       FQDN..

   VPN4
       synonomous for KEY4

   VPN6
       synonomous for KEY6

REPLIES TO QUERIES

       All replies from the queries are in the following format:

           <ID> <TIME> <TTL> <TYPE> <TYPE-SPECIFIC> \n

       ID
           this is the queryid value that was provided in the query. It is
           repeated on every line to permit the replies to be properly
           associated with the query. When the response is not ascribable to
           particular query (such as for a mis-formed query), then the query
           ID "0" will be used.

       TIME
           this is the current time in seconds since epoch.

       TTL
           for answers which have a time to live, this is the current value.
           The answer is valid for this number of seconds. If there is no
           useful value here, then the number 0 is used.

       TYPE
           This is the type of the record that is being returned. The types
           are described in the next section. The TYPE specific data that
           follows is specific to the type.

       The replies are limited to 4096 bytes, a value defined as
       LWDNSQ_RESULT_LEN_MAX. This is defined in freeswan.h.

       All of the replies which include resource records use the standard
       presentation format (with no line feeds or carriage returns) in their
       answer.

   START
       This reply indicates that a query has been received and has been
       started. It serves as an anchor point for timing, as well as an
       acknowledgement.

   DONE
       This reply indicates that a query is entirely over, and no further
       information from this query will be sent.

   RETRY
       This reply indicates that a query is entirely over, but that no data
       was found. The records may exist, but appropriate servers could not be
       reached.

   FATAL
       This reply indicates that a query is entirely over, and that no data of
       the type requested could be found. There were no timeouts, and all
       servers were available and confirmed non-existances. There may be NXT
       records returned prior to this.

   CNAME
       This is an interim reply, and indicates that a CNAME was found (and
       followed) while performing the query. The value of the CNAME is present
       in the type specific section.

   CNAMEFROM
       This is an interim reply, and indicates that a CNAME was found. The
       original name that was queries for was not the canonical name, and this
       reply indicates the name that was actually followed.

   NAME
       This is an interim reply. The original name that was queries for was
       not the canonical name. This reply indicates the canonical name.

   DNSSEC
       This is an interim reply. It is followed either by "OKAY" or "not
       present. It indicates if DNSSEC was available on the reply.

   TXT and AD-TXT
       This is an interim reply. If there are TXT resource records in the
       reply, then each one is presented using this type. If preceded by AD-,
       then this record was signed with DNSSEC.

   A and AD-A
       This is an interim reply. If there are A resource records in the reply,
       then each one is presented using this type. If preceded by AD-, then
       this record was signed with DNSSEC.

   AAAA and AD-AAAA
       This is an interim reply. If there are AAAA resource records in the
       reply, then each one is presented using this type. If preceded by AD-,
       then this record was signed with DNSSEC.

   PTR and AD-PTR
       This is an interim reply. If there are PTR resource records in the
       reply, then each one is presented using this type. If preceded by AD-,
       then this record was signed with DNSSEC.

   KEY and AD-KEY
       This is an interim reply. If there are KEY resource records in the
       reply, then each one is presented using this type. If preceded by AD-,
       then this record was signed with DNSSEC.

   IPSECKEY and AD-IPSECKEY
       This is an interim reply. If there are IPSEC resource records in the
       reply, then each one is presented using this type. If preceded by AD-,
       then this record was signed with DNSSEC.

SPECIAL IPSECKEY PROCESSING

       At the time of this writing, the IPSECKEY resource record is not
       entirely specified. In particular no resource record number has been
       assigned. This program assumes that it is resource record number 45. If
       the file /etc/ipsec.d/lwdnsq.conf exists, and contains a line like

           ipseckey_rr=number

       then this number will be used instead. The file is read only once at
       startup.

OE DIRECTIVES

       If the file /etc/ipsec.d/lwdnsq.conf exists, and contains a line like

           queryany=false

       then instead of doing an ALL query when looking for OE delegation
       records, lwdnsq will do a series of queries. It will first look for
       IPSECKEY, and then TXT record. If it finds neither, it will then look
       for KEY records of all kinds, although they do not contain delegation
       information.

SPECIAL IPSECKEY PROCESSING

           /etc/ipsec.d/lwdnsq.conf

BUGS

       Not all listed commands are actually implemented.

AUTHOR

       Michael Richardson <mcr@sandelman.ottawa.on.ca>.