DNS

FOR PHP >= 5.5 AND < 7.4 ONLY

For newer PHP version we strongly suggest bluelibraries/dns

Use certain DNS handler for DNS interrogation

Demo

Example:

$records = DNS::getRecords('bluelibraries.com', RecordTypes::ANY);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\NS Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 21600
[class] => IN
[type] => NS
[target] => ns3.instradns.com
)
)
[1] => BlueLibraries\Dns\Records\Types\A Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 21600
[class] => IN
[type] => A
[ip] => 198.50.252.64
)
)
)

Install via composer

composer require bluelibraries/php5-dns

This package contains 4 types which can be used for DNS interrogations

1. DnsGetRecord based on dns_get_record PHP function
2. Dig based on dig shell command (better than dns_get_record and still secured)
3. UDP based on raw DNS calls using UDP/socket - useful for short answered queries as UDP answers might be limited to 512 bytes
4. TCP based on raw DNS calls using TCP/socket - this the best and is set as default handler

Dns handlers comparison

Feature	DNS_GET_RECORD	DIG	UDP	TCP
Force timeout limit	NO	YES	YES	YES
Detect more record types that are defined in PHP	NO	YES	YES	YES
Use custom nameserver	NO	YES	YES	YES
Handle large responses	YES	YES	NO	YES
No need for extra modules/packages for running	YES	NO	YES	YES

Dns handlers custom settings

// Let's customize the DNS request handler - TCP$dnsHandler = (newTCP())
->setPort(53)
->setNameserver('8.8.8.8')
->setTimeout(3) // limit execution to 3 seconds
->setRetries(5); // allows 5 retries if response fails// Let's initialize the DNS records service$dnsRecordsService = newDnsRecords($dnsHandler);
// let's get some TXT records from `bluelibraries.com`$records = $dnsRecordsService->get('bluelibraries.com', RecordTypes::TXT);
// let's display themprint_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\TXT Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => TXT
[txt] => google-site-verification=kWtestq0tP8Ae_WJhRwUcZoqpdEkvuXJk
)
)
[1] => BlueLibraries\Dns\Records\Types\TXT Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => TXT
[txt] => 55d34914-636b-4x-b349-fdb9f2c1eaca
)
)
)

Similar for UDP and DIG

$dnsHandler = (newUDP())
->setPort(53)
->setNameserver('8.8.8.8')
->setTimeout(3) // limit execution to 3 seconds
->setRetries(5); // allows 5 retries if response fails$dnsHandler = (newDIG())
->setPort(53)
->setNameserver('8.8.8.8')
->setTimeout(3) // limit execution to 3 seconds
->setRetries(5); // allows 5 retries if response fails

DnsGetRecord - this handler has a limited number of settings

// DnsGetRecord allows only Timeout and Retries, but there is no control over timeout// so the timeout may be much longer than the limit we set!$dnsHandler = (newDnsGetRecord())
->setTimeout(3) // limit execution to 3 seconds
->setRetries(5); // allows 5 retries if response fails

Retrieve records examples, and more...

• A
• NS
• CNAME
• SOA
• PTR
• HINFO
• MX
• TXT
  • SPF
  • DKIM
  • DMARC
  • MtaSts
  • TlsReporting
  • DomainVerification
• AAAA
• SRV
• NAPTR
• DS
• RRSIG
• NSEC
• DNSKEY
• NSEC3PARAM
• CDS
• CDNSKEY
• HTTPS
• CAA

Retrieve records using dns_get_record

$records = DNS::getRecords('bluelibraries.com', RecordTypes::TXT, DnsHandlerTypes::DNS_GET_RECORD);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\Txt\DomainVerification Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[class] => IN
[ttl] => 0
[type] => TXT
[txt] => google-site-verification=test-636b-4a56-b349-test
)
)
)

Retrieve records using dig

$records = DNS::getRecords('bluelibraries.com', RecordTypes::TXT, DnsHandlerTypes::DIG);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\Txt\DomainVerification Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[class] => IN
[ttl] => 0
[type] => TXT
[txt] => google-site-verification=test-636b-4a56-b349-test
)
)
)

Retrieve records using UDP

$records = DNS::getRecords('bluelibraries.com', RecordTypes::TXT, DnsHandlerTypes::UDP);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\Txt\DomainVerification Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[class] => IN
[ttl] => 0
[type] => TXT
[txt] => google-site-verification=test-636b-4a56-b349-test
)
)
)

Retrieve records using TCP

// TCP is the default DNS handler, so if you are using it then you can skip it$records = DNS::getRecords('bluelibraries.com', RecordTypes::TXT);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\Txt\DomainVerification Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[class] => IN
[ttl] => 0
[type] => TXT
[txt] => google-site-verification=test-636b-4a56-b349-test
)
)
)

Retrieve TXT records

$records = DNS::getRecords('bluelibraries.com', RecordTypes::TXT);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\Txt\DomainVerification Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3454
[class] => IN
[type] => TXT
[txt] => google-site-verification=kW9t2V_S7WjOX57zq0tP8Ae_WJhRwUcZoqpdEkvuXJk
)
)
[1] => BlueLibraries\Dns\Records\Types\TXT Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3454
[class] => IN
[type] => TXT
[txt] => 55d14914-636b-4a56-b349-fdb9f2c1eaca
)
)
)

Retrieve A (address) records

$records = DNS::getRecords('bluelibraries.com', RecordTypes::A);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\A Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => A
[ip] => 67.225.146.248
)
)
)

Retrieve ALL records

$records = DNS::getRecords('bluelibraries.com', RecordTypes::ALL, DnsHandlerTypes::DIG);
print_r($records);

Array
(
[0] => BlueLibraries\Dns\Records\Types\NS Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => NS
[target] => ns2.teestbluelibraries.com
)
)
[1] => BlueLibraries\Dns\Records\Types\Txt\DomainVerification Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => TXT
[txt] => google-site-verification=errre
)
)
[2] => BlueLibraries\Dns\Records\Types\NS Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => NS
[target] => tst3.bluelibraries.com
)
)
[3] => BlueLibraries\Dns\Records\Types\TXT Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => TXT
[txt] => 55d34914-636b-4tes-b349-fdb9f2c1eaca
)
)
[4] => BlueLibraries\Dns\Records\Types\A Object
(
[data:protected] => Array
(
[host] => bluelibraries.com
[ttl] => 3600
[class] => IN
[type] => A
[ip] => 67.225.146.248
)
)
)