Topic Path: Symbol Reference > Classes > TDNSHeader Class
Represents the Header section in a DNS message packet.
TDNSHeader = class;
TDNSHeader is a TObject descendant that represents the Header section in a DNS message packet. A DNS message packet may contain the following 5 sections:
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Section |
Description |
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Header |
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Question |
question for the name server |
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Answer |
resource records answering the question |
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Authority |
resource records pointing toward an authority |
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Additional |
resource records holding additional information |
The TDNSHeader header section is always present in the message packet, and includes values that specify which of the remaining sections are present. TDNSHeader also provides properties specific to the header section or the entire message packet, including:
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Field |
Description |
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Identifier assigned to a DNS query. | |
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Query (0) or Response (1) flag. | |
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Indicates the kind of query to be performed. | |
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Indicates the responsing DNS server is an authority for the domain. | |
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Indicates the message was truncated. | |
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Indicates recurive queries are desired on the DNS server. | |
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Indicates recurive queries are available on the DNS server. | |
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Response code from the DNS server. | |
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Number of entries in the DNS Question section. | |
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Number of resource records in the DNS Answer section. | |
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Number of resource records in the DNS Authority section. | |
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Number of resource records in the DNS Additional section. |
TDNSHeader is used in the message packet for both a DNS query and a DNS response, although some values are only appropriate in one or the other context.
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Copyright © 1993-2006, Chad Z. Hower (aka Kudzu) and the Indy Pit Crew. All rights reserved.
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