SKOOR Documentation

DNS Query

Function	Checks a given DNS record on a DNS server
Alarming	Transfer time, Execution time, Response code

This job must reside below a device which is itself a DNS server. It will not work on devices where no DNS service is running.

DNS Query detail

DNS Query parameters

Parameter	Description
Record type	Choose from one of the following record types: A (forward) address record Used to map hostnames to an IP address. CNAMEs are also followed when checking A records. AAAA (IPv6 forward) address record Used to map hostnames to an IPv6 address. Cname canonical name record Alias of one name to another. The DNS lookup will continue by retrying the lookup with the new name Ptr (reverse) pointer record A pointer to a canonical name. Unlike with CNAME, DNS processing does NOT proceed, only the name is returned. The most common use is implementing reverse DNS lookups by putting a PTR record for a hostname in the in-addr.arpa. domain that corresponds to an IP address. Text Originally intended to carry arbitrary human-readable text in a DNS record. Since the early 1990s, however, this record is more often used to carry machine-readable data such as specified by RFC 1464, opportunistic encryption, Sender Policy Framework and Domain Keys. Responsible person An RP-record specifies the mailbox of the person responsible for the host (domain name). A SOA-record defines the responsible person for an entire zone, but a zone may contain a large number of individual hosts and domain names for which different people are assigned responsibility. The RP-record makes it possible to identify the responsible person for individual domain names contained within the zone. To specify the "mailbox", replace the email address @ sign with a dot (.). Optionally specify the domain name for a TXT-record with additional information. Service A generalized service location record, used for newer protocols instead of creating protocol-specific records such as MX.
Argument to check	Depends on the record type
Expected	Expected answer, depends on the record type. This parameter may contain wildcard characters such as * and ? when used with A and AAAA records.

Parameter

Description

Record type

Choose from one of the following record types:

A (forward) address record
Used to map hostnames to an IP address.
CNAMEs are also followed when checking A records.
AAAA (IPv6 forward) address record
Used to map hostnames to an IPv6 address.
Cname canonical name record
Alias of one name to another. The DNS lookup will continue by retrying the lookup with the new name
Ptr (reverse) pointer record
A pointer to a canonical name. Unlike with CNAME, DNS processing does NOT proceed, only the name is returned. The most common use is implementing reverse DNS lookups by putting a PTR record for a hostname in the in-addr.arpa. domain that corresponds to an IP address.
Text
Originally intended to carry arbitrary human-readable text in a DNS record. Since the early 1990s, however, this record is more often used to carry machine-readable data such as specified by RFC 1464, opportunistic encryption, Sender Policy Framework and Domain Keys.
Responsible person
An RP-record specifies the mailbox of the person responsible for the host (domain name). A SOA-record defines the responsible person for an entire zone, but a zone may contain a large number of individual hosts and domain names for which different people are assigned responsibility. The RP-record makes it possible to identify the responsible person for individual domain names contained within the zone. To specify the "mailbox", replace the email address @ sign with a dot (.). Optionally specify the domain name for a TXT-record with additional information.
Service
A generalized service location record, used for newer protocols instead of creating protocol-specific records such as MX.

Argument to check

Depends on the record type

Expected

Expected answer, depends on the record type. This parameter may contain wildcard characters such as * and ? when used with A and AAAA records.

DNS Query values and alarm limits

Value / Alarm limit	Description
Transfer time	Time to transfer the information
Execution time	Time to execute the query
Response code	0 No error -1 General error
Error code	Generic job error code (see section Job error codes)

DNS Query examples

Example 1 - Ask for A record

Record type	A (forward)
Argument to check	skoor.com
Expected	195.49.42.34

Output 1

In case a wrong Expected entry was made or the IP address has changed in the DNS, a warning is returned:

Example 2 - Ask for the IP address mapped to an A record

Record type	PTR (reverse)
Argument to check	10.1.2.30
Expected	repo.junisphere.local

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