Struct domain::bits::header::HeaderCounts
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pub struct HeaderCounts { /* fields omitted */ }
The section count part of the header section of a DNS message.
This part consists of four 16 bit counters for the number of entries in the four sections of a DNS message.
The counters are arranged in the same order as the sections themselves: QDCOUNT for the question section, ANCOUNT for the answer section, NSCOUNT for the authority section, and ARCOUNT for the additional section. These are defined in RFC 1035.
RFC 2136 defines the UPDATE method and reuses the four section for different purposes. Here the counters are ZOCOUNT for the zone section, PRCOUNT for the prerequisite section, UPCOUNT for the update section, and ADCOUNT for the additional section. The type has convenience methods for these fields as well so you don’t have to remember which is which.
For each field there are three methods for getting, setting, and incrementing.
Methods
impl HeaderCounts
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fn new() -> HeaderCounts
Creates a new value with all counters set to zero.
fn from_message(s: &[u8]) -> &HeaderCounts
Creates a reference from the bytes slice of a message (!).
Panics
This function panics if the bytes slice is too short.
fn from_message_mut(s: &mut [u8]) -> &mut HeaderCounts
Creates a mutable reference from the bytes slice of a message.
Panics
This function panics if the bytes slice is too short.
fn as_bytes(&self) -> &[u8]
Returns a reference to the underlying bytes slice.
impl HeaderCounts
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fn qdcount(&self) -> u16
Returns the value of the QDCOUNT field.
This field contains the number of questions in the first section of the message, normally the question section.
fn set_qdcount(&mut self, value: u16)
Sets the value of the QDCOUNT field.
fn inc_qdcount(&mut self, inc: u16) -> ComposeResult<()>
Increase the value of the QDCOUNT field.
fn ancount(&self) -> u16
Returns the value of the ANCOUNT field.
This field contains the number of resource records in the second section of the message, normally the answer section.
fn set_ancount(&mut self, value: u16)
Sets the value of the ANCOUNT field.
fn inc_ancount(&mut self, inc: u16) -> ComposeResult<()>
Increases the value of the ANCOUNT field.
fn nscount(&self) -> u16
Returns the value of the NSCOUNT field.
This field contains the number of resource records in the third section of the message, normally the authority section.
fn set_nscount(&mut self, value: u16)
Sets the value of the NSCOUNT field.
fn inc_nscount(&mut self, inc: u16) -> ComposeResult<()>
Increases the value of the NSCOUNT field.
fn arcount(&self) -> u16
Returns the value of the ARCOUNT field.
This field contains the number of resource records in the fourth section of the message, normally the additional section.
fn set_arcount(&mut self, value: u16)
Sets the value of the ARCOUNT field.
fn inc_arcount(&mut self, inc: u16) -> ComposeResult<()>
Increases the value of the ARCOUNT field.
fn zocount(&self) -> u16
Returns the value of the ZOCOUNT field.
This is the same as the qdcount()
. It is used in UPDATE queries
where the first section is the zone section.
fn set_zocount(&mut self, value: u16)
Sets the value of the ZOCOUNT field.
fn inc_zocount(&mut self, inc: u16) -> ComposeResult<()>
Increments the value of the ZOCOUNT field.
fn prcount(&self) -> u16
Returns the value of the PRCOUNT field.
This is the same as the ancount()
. It is used in UPDATE queries
where the first section is the prerequisite section.
fn set_prcount(&mut self, value: u16)
Sete the value of the PRCOUNT field.
fn inc_prcount(&mut self, inc: u16) -> ComposeResult<()>
Increments the value of the PRCOUNT field,
fn upcount(&self) -> u16
Returns the value of the UPCOUNT field.
This is the same as the nscount()
. It is used in UPDATE queries
where the first section is the update section.
fn set_upcount(&mut self, value: u16)
Sets the value of the UPCOUNT field.
fn inc_upcount(&mut self, inc: u16) -> ComposeResult<()>
Increments the value of the UPCOUNT field.
fn adcount(&self) -> u16
Returns the value of the ADCOUNT field.
This is the same as the arcount()
. It is used in UPDATE queries
where the first section is the additional section.
fn set_adcount(&mut self, value: u16)
Sets the value of the ADCOUNT field.
fn inc_adcount(&mut self, inc: u16) -> ComposeResult<()>
Increments the value of the ADCOUNT field.
Trait Implementations
impl Clone for HeaderCounts
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fn clone(&self) -> HeaderCounts
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
1.0.0
Performs copy-assignment from source
. Read more
impl Debug for HeaderCounts
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impl Default for HeaderCounts
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fn default() -> HeaderCounts
Returns the "default value" for a type. Read more
impl PartialEq for HeaderCounts
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fn eq(&self, __arg_0: &HeaderCounts) -> bool
This method tests for self
and other
values to be equal, and is used by ==
. Read more
fn ne(&self, __arg_0: &HeaderCounts) -> bool
This method tests for !=
.