Module header

The header of a DNS message.

Each DNS message starts with a twelve octet long header section containing some general information related to the message as well as the number of records in each of the four sections that follow the header. Its content and format are defined in section 4.1.1 of RFC 1035.

In order to reflect the fact that changing the section counts may invalidate the rest of the message whereas the other elements of the header section can safely be modified, the whole header has been split into two separate types: Header contains the safely modifyable part at the beginning and HeaderCounts contains the section counts. In addition, the HeaderSection type wraps both of them into a single type.

Structs

• CountOverflow
  An error happened while increasing a header count.
• Flags
  The flags contained in the DNS message header.
• FlagsFromStrError
  An error happened when converting string to flags.
• Header
  The first part of the header of a DNS message.
• HeaderCounts
  The section count part of the header section of a DNS message.
• HeaderSection
  The complete header section of a DNS message.