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            "type": "text",
            "text": "# Net::DNS::Resolver (perldoc)\n\n## NAME\n\nNet::DNS::Resolver - DNS resolver class\n\n## SYNOPSIS\n\nuse Net::DNS;\n$resolver = Net::DNS::Resolver->new();\n# Perform a lookup, using the searchlist if appropriate.\n$reply = $resolver->search( 'example.com' );\n# Perform a lookup, without the searchlist\n$reply = $resolver->query( 'example.com', 'MX' );\n# Perform a lookup, without pre or post-processing\n$reply = $resolver->send( 'example.com', 'MX', 'IN' );\n# Send a prebuilt query packet\n$query = Net::DNS::Packet->new( ... );\n$reply = $resolver->send( $query );\n\n## DESCRIPTION\n\nInstances of the Net::DNS::Resolver class represent resolver objects. A program may have\nmultiple resolver objects, each maintaining its own state information such as the nameservers to\nbe queried, whether recursion is desired, etc.\n\n## Sections\n\n- **NAME**\n- **SYNOPSIS**\n- **DESCRIPTION**\n- **METHODS**\n- **ENVIRONMENT**\n- **CUSTOMISED RESOLVERS**\n- **COPYRIGHT**\n- **LICENSE**\n- **SEE ALSO**\n\nUse structuredContent.sections for detailed options, examples, and full documentation.\n"
        }
    ],
    "structuredContent": {
        "command": "Net::DNS::Resolver",
        "section": "",
        "mode": "perldoc",
        "summary": "Net::DNS::Resolver - DNS resolver class",
        "synopsis": "use Net::DNS;\n$resolver = Net::DNS::Resolver->new();\n# Perform a lookup, using the searchlist if appropriate.\n$reply = $resolver->search( 'example.com' );\n# Perform a lookup, without the searchlist\n$reply = $resolver->query( 'example.com', 'MX' );\n# Perform a lookup, without pre or post-processing\n$reply = $resolver->send( 'example.com', 'MX', 'IN' );\n# Send a prebuilt query packet\n$query = Net::DNS::Packet->new( ... );\n$reply = $resolver->send( $query );",
        "tldr_summary": null,
        "tldr_examples": [],
        "tldr_source": null,
        "flags": [],
        "examples": [],
        "see_also": [
            {
                "name": "resolver",
                "section": "5",
                "url": "https://www.chedong.com/phpMan.php/man/resolver/5/json"
            }
        ],
        "section_outline": [
            {
                "name": "NAME",
                "lines": 2,
                "subsections": []
            },
            {
                "name": "SYNOPSIS",
                "lines": 17,
                "subsections": []
            },
            {
                "name": "DESCRIPTION",
                "lines": 4,
                "subsections": []
            },
            {
                "name": "METHODS",
                "lines": 445,
                "subsections": []
            },
            {
                "name": "ENVIRONMENT",
                "lines": 59,
                "subsections": []
            },
            {
                "name": "CUSTOMISED RESOLVERS",
                "lines": 16,
                "subsections": []
            },
            {
                "name": "COPYRIGHT",
                "lines": 10,
                "subsections": []
            },
            {
                "name": "LICENSE",
                "lines": 12,
                "subsections": []
            },
            {
                "name": "SEE ALSO",
                "lines": 3,
                "subsections": []
            }
        ],
        "sections": {
            "NAME": {
                "content": "Net::DNS::Resolver - DNS resolver class\n",
                "subsections": []
            },
            "SYNOPSIS": {
                "content": "use Net::DNS;\n\n$resolver = Net::DNS::Resolver->new();\n\n# Perform a lookup, using the searchlist if appropriate.\n$reply = $resolver->search( 'example.com' );\n\n# Perform a lookup, without the searchlist\n$reply = $resolver->query( 'example.com', 'MX' );\n\n# Perform a lookup, without pre or post-processing\n$reply = $resolver->send( 'example.com', 'MX', 'IN' );\n\n# Send a prebuilt query packet\n$query = Net::DNS::Packet->new( ... );\n$reply = $resolver->send( $query );\n",
                "subsections": []
            },
            "DESCRIPTION": {
                "content": "Instances of the Net::DNS::Resolver class represent resolver objects. A program may have\nmultiple resolver objects, each maintaining its own state information such as the nameservers to\nbe queried, whether recursion is desired, etc.\n",
                "subsections": []
            },
            "METHODS": {
                "content": "new\n# Use the default configuration\n$resolver = Net::DNS::Resolver->new();\n\n# Use my own configuration file\n$resolver = Net::DNS::Resolver->new( configfile => '/my/dns.conf' );\n\n# Set options in the constructor\n$resolver = Net::DNS::Resolver->new(\nnameservers => [ '2001:DB8::1', 'ns.example.com' ],\nrecurse     => 0,\ndebug       => 1\n);\n\nReturns a resolver object. If no arguments are supplied, \"new()\" returns an object having the\ndefault configuration.\n\nOn Unix and Linux systems, the default values are read from the following files, in the order\nindicated:\n\n/etc/resolv.conf, $HOME/.resolv.conf, ./.resolv.conf\n\nThe following keywords are recognised in resolver configuration files:\n\nnameserver address\n\nIP address of a name server that the resolver should query.\n\ndomain localdomain\n\nThe domain suffix to be appended to a short non-absolute name.\n\nsearch domain ...\n\nA space-separated list of domains in the desired search path.\n\noptions option:value ...\n\nA space-separated list of key:value items.\n\nExcept for /etc/resolv.conf, files will only be read if owned by the effective userid running\nthe program. In addition, several environment variables may contain configuration information;\nsee \"ENVIRONMENT\".\n\nNote that the domain and searchlist keywords are mutually exclusive. If both are present, the\nresulting behaviour is unspecified. If neither is present, the domain is determined from the\nlocal hostname.\n\nOn Windows systems, an attempt is made to determine the system defaults using the registry.\nSystems with many dynamically configured network interfaces may confuse Net::DNS.\n\n# Use my own configuration file\n$resolver = Net::DNS::Resolver->new( configfile => '/my/dns.conf' );\n\nYou can include a configuration file of your own when creating a resolver object. This is\nsupported on both Unix and Windows.\n\nIf a custom configuration file is specified at first instantiation, all other configuration\nfiles and environment variables are ignored.\n\n# Set options in the constructor\n$resolver = Net::DNS::Resolver->new(\nnameservers => [ '2001:DB8::1', 'ns.example.com' ],\nrecurse     => 0\n);\n\nExplicit arguments to \"new()\" override the corresponding configuration variables. The argument\nlist consists of a sequence of (name=>value) pairs, each interpreted as an invocation of the\ncorresponding method.\n\nprint\n$resolver->print;\n\nPrints the resolver state on the standard output.\n\nquery\n$packet = $resolver->query( 'host' );\n$packet = $resolver->query( 'host.example.com' );\n$packet = $resolver->query( '2001:DB8::1' );\n$packet = $resolver->query( 'example.com', 'MX' );\n$packet = $resolver->query( 'annotation.example.com', 'TXT', 'IN' );\n\nPerforms a DNS query for the given name; the search list is not applied. If \"defnames\" is true,\nthe default domain will be appended to unqualified names.\n\nThe record type and class can be omitted; they default to A and IN. If the name looks like an IP\naddress (IPv4 or IPv6), then a query within in-addr.arpa or ip6.arpa will be performed.\n\nReturns a Net::DNS::Packet object, or \"undef\" if no answers were found. The reason for failure\nmay be determined using \"errorstring()\".\n\nIf you need to examine the response packet, whether it contains any answers or not, use the\n\"send()\" method instead.\n\nsearch\n$packet = $resolver->search( 'host' );\n$packet = $resolver->search( 'host.example.com' );\n$packet = $resolver->search( '2001:DB8::1' );\n$packet = $resolver->search( 'example.com', 'MX' );\n$packet = $resolver->search( 'annotation.example.com', 'TXT', 'IN' );\n\nPerforms a DNS query for the given name, applying the searchlist if appropriate. The search\nalgorithm is as follows:\n\nIf the name contains one or more non-terminal dots, perform an initial query using the\nunmodified name.\n\nIf the number of dots is less than \"ndots\", and there is no terminal dot, try appending each\nsuffix in the search list.\n\nThe record type and class can be omitted; they default to A and IN. If the name looks like an IP\naddress (IPv4 or IPv6), then a query within in-addr.arpa or ip6.arpa will be performed.\n\nReturns a Net::DNS::Packet object, or \"undef\" if no answers were found. The reason for failure\nmay be determined using \"errorstring()\".\n\nIf you need to examine the response packet, whether it contains any answers or not, use the\n\"send()\" method instead.\n\nsend\n$packet = $resolver->send( $query );\n\n$packet = $resolver->send( 'host.example.com' );\n$packet = $resolver->send( '2001:DB8::1' );\n$packet = $resolver->send( 'example.com', 'MX' );\n$packet = $resolver->send( 'annotation.example.com', 'TXT', 'IN' );\n\nPerforms a DNS query for the given name. Neither the searchlist nor the default domain will be\nappended.\n\nThe argument list can be either a pre-built query Net::DNS::Packet or a list of strings. The\nrecord type and class can be omitted; they default to A and IN. If the name looks like an IP\naddress (IPv4 or IPv6), then a query within in-addr.arpa or ip6.arpa will be performed.\n\nReturns a Net::DNS::Packet object whether there were any answers or not. Use\n\"$packet->header->ancount\" or \"$packet->answer\" to find out if there were any records in the\nanswer section. Returns \"undef\" if no response was received.\n\naxfr\n@zone = $resolver->axfr();\n@zone = $resolver->axfr( 'example.com' );\n@zone = $resolver->axfr( 'example.com', 'IN' );\n\n$iterator = $resolver->axfr();\n$iterator = $resolver->axfr( 'example.com' );\n$iterator = $resolver->axfr( 'example.com', 'IN' );\n\n$rr = $iterator->();\n\nPerforms a zone transfer using the resolver nameservers list, attempted in the order listed.\n\nIf the zone is omitted, it defaults to the first zone listed in the resolver search list.\n\nIf the class is omitted, it defaults to IN.\n\nWhen called in list context, \"axfr()\" returns a list of Net::DNS::RR objects. The redundant SOA\nrecord that terminates the zone transfer is not returned to the caller.\n\nIn deferrence to RFC1035(6.3), a complete zone transfer is expected to return all records in the\nzone or nothing at all. When no resource records are returned by \"axfr()\", the reason for\nfailure may be determined using \"errorstring()\".\n\nHere is an example that uses a timeout and TSIG verification:\n\n$resolver->tcptimeout( 10 );\n$resolver->tsig( 'Khmac-sha1.example.+161+24053.private' );\n@zone = $resolver->axfr( 'example.com' );\n\nforeach $rr (@zone) {\n$rr->print;\n}\n\nWhen called in scalar context, \"axfr()\" returns an iterator object. Each invocation of the\niterator returns a single Net::DNS::RR or \"undef\" when the zone is exhausted.\n\nAn exception is raised if the zone transfer can not be completed.\n\nThe redundant SOA record that terminates the zone transfer is not returned to the caller.\n\nHere is the example above, implemented using an iterator:\n\n$resolver->tcptimeout( 10 );\n$resolver->tsig( 'Khmac-sha1.example.+161+24053.private' );\n$iterator = $resolver->axfr( 'example.com' );\n\nwhile ( $rr = $iterator->() ) {\n$rr->print;\n}\n\nbgsend\n$handle = $resolver->bgsend( $packet ) || die $resolver->errorstring;\n\n$handle = $resolver->bgsend( 'host.example.com' );\n$handle = $resolver->bgsend( '2001:DB8::1' );\n$handle = $resolver->bgsend( 'example.com', 'MX' );\n$handle = $resolver->bgsend( 'annotation.example.com', 'TXT', 'IN' );\n\nPerforms a background DNS query for the given name and returns immediately without waiting for\nthe response. The program can then perform other tasks while awaiting the response from the\nnameserver.\n\nThe argument list can be either a Net::DNS::Packet object or a list of strings. The record type\nand class can be omitted; they default to A and IN. If the name looks like an IP address (IPv4\nor IPv6), then a query within in-addr.arpa or ip6.arpa will be performed.\n\nReturns an opaque handle which is passed to subsequent invocations of the \"bgbusy()\" and\n\"bgread()\" methods. Errors are indicated by returning \"undef\" in which case the reason for\nfailure may be determined using \"errorstring()\".\n\nThe response Net::DNS::Packet object is obtained by calling \"bgread()\".\n\nBEWARE: Programs should make no assumptions about the nature of the handles returned by\n\"bgsend()\" which should be used strictly as described here.\n\nbgread\n$handle = $resolver->bgsend( 'www.example.com' );\n$packet = $resolver->bgread($handle);\n\nReads the response following a background query. The argument is the handle returned by\n\"bgsend()\".\n\nReturns a Net::DNS::Packet object or \"undef\" if no response was received before the timeout\ninterval expired.\n\nbgbusy\n$handle = $resolver->bgsend( 'foo.example.com' );\n\nwhile ($resolver->bgbusy($handle)) {\n...\n}\n\n$packet = $resolver->bgread($handle);\n\nReturns true while awaiting the response or for the transaction to time out. The argument is the\nhandle returned by \"bgsend()\".\n\nTruncated UDP packets will be retried transparently using TCP while continuing to assert busy to\nthe caller.\n\ndebug\nprint 'debug flag: ', $resolver->debug, \"\\n\";\n$resolver->debug(1);\n\nGet or set the debug flag. If set, calls to \"search()\", \"query()\", and \"send()\" will print\ndebugging information on the standard output. The default is false.\n\ndefnames\nprint 'defnames flag: ', $resolver->defnames, \"\\n\";\n$resolver->defnames(0);\n\nGet or set the defnames flag. If true, calls to \"query()\" will append the default domain to\nresolve names that are not fully qualified. The default is true.\n\ndnsrch\nprint 'dnsrch flag: ', $resolver->dnsrch, \"\\n\";\n$resolver->dnsrch(0);\n\nGet or set the dnsrch flag. If true, calls to \"search()\" will apply the search list to resolve\nnames that are not fully qualified. The default is true.\n\ndomain\n$domain = $resolver->domain;\n$resolver->domain( 'domain.example' );\n\nGets or sets the resolver default domain.\n\nigntc\nprint 'igntc flag: ', $resolver->igntc, \"\\n\";\n$resolver->igntc(1);\n\nGet or set the igntc flag. If true, truncated packets will be ignored. If false, the query will\nbe retried using TCP. The default is false.\n\nnameserver, nameservers\n@nameservers = $resolver->nameservers();\n$resolver->nameservers( '2001:DB8::1', '192.0.2.1' );\n$resolver->nameservers( 'ns.domain.example.' );\n\nGets or sets the nameservers to be queried.\n\nAlso see the IPv6 transport notes below\n\npersistenttcp\nprint 'Persistent TCP flag: ', $resolver->persistenttcp, \"\\n\";\n$resolver->persistenttcp(1);\n\nGet or set the persistent TCP setting. If true, Net::DNS will keep a TCP socket open for each\nhost:port to which it connects. This is useful if you are using TCP and need to make a lot of\nqueries or updates to the same nameserver.\n\nThe default is false unless you are running a SOCKSified Perl, in which case the default is\ntrue.\n\npersistentudp\nprint 'Persistent UDP flag: ', $resolver->persistentudp, \"\\n\";\n$resolver->persistentudp(1);\n\nGet or set the persistent UDP setting. If true, a Net::DNS resolver will use the same UDP socket\nfor all queries within each address family.\n\nThis avoids the cost of creating and tearing down UDP sockets, but also defeats source port\nrandomisation.\n\nport\nprint 'sending queries to port ', $resolver->port, \"\\n\";\n$resolver->port(9732);\n\nGets or sets the port to which queries are sent. Convenient for nameserver testing using a\nnon-standard port. The default is port 53.\n\nrecurse\nprint 'recursion flag: ', $resolver->recurse, \"\\n\";\n$resolver->recurse(0);\n\nGet or set the recursion flag. If true, this will direct nameservers to perform a recursive\nquery. The default is true.\n\nretrans\nprint 'retrans interval: ', $resolver->retrans, \"\\n\";\n$resolver->retrans(3);\n\nGet or set the retransmission interval The default is 5 seconds.\n\nretry\nprint 'number of tries: ', $resolver->retry, \"\\n\";\n$resolver->retry(2);\n\nGet or set the number of times to try the query. The default is 4.\n\nsearchlist\n@searchlist = $resolver->searchlist;\n$resolver->searchlist( 'a.example', 'b.example', 'c.example' );\n\nGets or sets the resolver search list.\n\nsrcaddr\n$resolver->srcaddr('2001::DB8::1');\n\nSets the source address from which queries are sent. Convenient for forcing queries from a\nspecific interface on a multi-homed host. The default is to use any local address.\n\nsrcport\n$resolver->srcport(5353);\n\nSets the port from which queries are sent. The default is 0, meaning any port.\n\ntcptimeout\nprint 'TCP timeout: ', $resolver->tcptimeout, \"\\n\";\n$resolver->tcptimeout(10);\n\nGet or set the TCP timeout in seconds. The default is 120 seconds (2 minutes).\n\nudptimeout\nprint 'UDP timeout: ', $resolver->udptimeout, \"\\n\";\n$resolver->udptimeout(10);\n\nGet or set the bgsend() UDP timeout in seconds. The default is 30 seconds.\n\nudppacketsize\nprint \"udppacketsize: \", $resolver->udppacketsize, \"\\n\";\n$resolver->udppacketsize(2048);\n\nGet or set the UDP packet size. If set to a value not less than the default DNS packet size, an\nEDNS extension will be added indicating support for large UDP datagrams.\n\nusevc\nprint 'usevc flag: ', $resolver->usevc, \"\\n\";\n$resolver->usevc(1);\n\nGet or set the usevc flag. If true, queries will be performed using virtual circuits (TCP)\ninstead of datagrams (UDP). The default is false.\n\nreplyfrom\nprint 'last response was from: ', $resolver->replyfrom, \"\\n\";\n\nReturns the IP address from which the most recent packet was received in response to a query.\n\nerrorstring\nprint 'query status: ', $resolver->errorstring, \"\\n\";\n\nReturns a string containing error information from the most recent DNS protocol interaction.\n\"errorstring()\" is meaningful only when interrogated immediately after the corresponding method\ncall.\n\ndnssec\nprint \"dnssec flag: \", $resolver->dnssec, \"\\n\";\n$resolver->dnssec(0);\n\nThe dnssec flag causes the resolver to transmit DNSSEC queries and to add a EDNS0 record as\nrequired by RFC2671 and RFC3225. The actions of, and response from, the remote nameserver is\ndetermined by the settings of the AD and CD flags.\n\nCalling the \"dnssec()\" method with a non-zero value will also set the UDP packet size to the\ndefault value of 2048. If that is too small or too big for your environment, you should call the\n\"udppacketsize()\" method immediately after.\n\n$resolver->dnssec(1);                # DNSSEC using default packetsize\n$resolver->udppacketsize(1250);      # lower the UDP packet size\n\nA fatal exception will be raised if the \"dnssec()\" method is called but the Net::DNS::SEC\nlibrary has not been installed.\n\nadflag\n$resolver->dnssec(1);\n$resolver->adflag(1);\nprint \"authentication desired flag: \", $resolver->adflag, \"\\n\";\n\nGets or sets the AD bit for dnssec queries. This bit indicates that the caller is interested in\nthe returned AD (authentic data) bit but does not require any dnssec RRs to be included in the\nresponse. The default value is false.\n\ncdflag\n$resolver->dnssec(1);\n$resolver->cdflag(1);\nprint \"checking disabled flag: \", $resolver->cdflag, \"\\n\";\n\nGets or sets the CD bit for dnssec queries. This bit indicates that authentication by upstream\nnameservers should be suppressed. Any dnssec RRs required to execute the authentication\nprocedure should be included in the response. The default value is false.\n\ntsig\n$resolver->tsig( $tsig );\n\n$resolver->tsig( 'Khmac-sha1.example.+161+24053.private' );\n\n$resolver->tsig( 'Khmac-sha1.example.+161+24053.key' );\n\n$resolver->tsig( 'Khmac-sha1.example.+161+24053.key',\nfudge => 60\n);\n\n$resolver->tsig( $keyname, $key );\n\n$resolver->tsig( undef );\n\nSet the TSIG record used to automatically sign outgoing queries, zone transfers and updates.\nAutomatic signing is disabled if called with undefined arguments.\n\nThe default resolver behaviour is not to sign any packets. You must call this method to set the\nkey if you would like the resolver to sign and verify packets automatically.\n\nPackets can also be signed manually; see the Net::DNS::Packet and Net::DNS::Update manual pages\nfor examples. TSIG records in manually-signed packets take precedence over those that the\nresolver would add automatically.\n",
                "subsections": []
            },
            "ENVIRONMENT": {
                "content": "The following environment variables can also be used to configure the resolver:\n\nRESNAMESERVERS\n# Bourne Shell\nRESNAMESERVERS=\"2001:DB8::1 192.0.2.1\"\nexport RESNAMESERVERS\n\n# C Shell\nsetenv RESNAMESERVERS \"2001:DB8::1 192.0.2.1\"\n\nA space-separated list of nameservers to query.\n\nRESSEARCHLIST\n# Bourne Shell\nRESSEARCHLIST=\"a.example.com b.example.com c.example.com\"\nexport RESSEARCHLIST\n\n# C Shell\nsetenv RESSEARCHLIST \"a.example.com b.example.com c.example.com\"\n\nA space-separated list of domains to put in the search list.\n\nLOCALDOMAIN\n# Bourne Shell\nLOCALDOMAIN=example.com\nexport LOCALDOMAIN\n\n# C Shell\nsetenv LOCALDOMAIN example.com\n\nThe default domain.\n\nRESOPTIONS\n# Bourne Shell\nRESOPTIONS=\"retrans:3 retry:2 inet6\"\nexport RESOPTIONS\n\n# C Shell\nsetenv RESOPTIONS \"retrans:3 retry:2 inet6\"\n\nA space-separated list of resolver options to set. Options that take values are specified as\n\"option:value\".\n\nIPv4 TRANSPORT\nThe \"forcev4()\", \"forcev6()\", \"preferv4()\", and \"preferv6()\" methods with non-zero argument\nmay be used to configure transport selection.\n\nThe behaviour of the \"nameserver()\" method illustrates the transport selection mechanism. If,\nfor example, IPv4 transport has been forced, the \"nameserver()\" method will only return IPv4\naddresses:\n\n$resolver->nameservers( '192.0.2.1', '192.0.2.2', '2001:DB8::3' );\n$resolver->forcev4(1);\nprint join ' ', $resolver->nameservers();\n\nwill print\n\n192.0.2.1 192.0.2.2\n",
                "subsections": []
            },
            "CUSTOMISED RESOLVERS": {
                "content": "Net::DNS::Resolver is actually an empty subclass. At compile time a super class is chosen based\non the current platform. A side benefit of this allows for easy modification of the methods in\nNet::DNS::Resolver. You can simply add a method to the namespace!\n\nFor example, if we wanted to cache lookups:\n\npackage Net::DNS::Resolver;\n\nmy %cache;\n\nsub search {\n$self = shift;\n\n$cache{\"@\"} ||= $self->SUPER::search(@);\n}\n",
                "subsections": []
            },
            "COPYRIGHT": {
                "content": "Copyright (c)1997-2000 Michael Fuhr.\n\nPortions Copyright (c)2002-2004 Chris Reinhardt.\n\nPortions Copyright (c)2005 Olaf M. Kolkman, NLnet Labs.\n\nPortions Copyright (c)2014,2015 Dick Franks.\n\nAll rights reserved.\n",
                "subsections": []
            },
            "LICENSE": {
                "content": "Permission to use, copy, modify, and distribute this software and its documentation for any\npurpose and without fee is hereby granted, provided that the original copyright notices appear\nin all copies and that both copyright notice and this permission notice appear in supporting\ndocumentation, and that the name of the author not be used in advertising or publicity\npertaining to distribution of the software without specific prior written permission.\n\nTHE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING\nBUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND\nNONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\nDAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\nOUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.\n",
                "subsections": []
            },
            "SEE ALSO": {
                "content": "perl, Net::DNS, Net::DNS::Packet, Net::DNS::Update, Net::DNS::Header, Net::DNS::Question,\nNet::DNS::RR, resolver(5), RFC 1034, RFC 1035\n",
                "subsections": []
            }
        }
    }
}