Struct DnsMap 

pub struct DnsMap { /* private fields */ }

Thread-safe bidirectional map between fake IPv4 addresses and hostnames.

Fake IPs are allocated sequentially from subnet.0.0.1 upwards.

Implementations

impl DnsMap

pub fn new(subnet: u8) -> Self

Create a new map that allocates from subnet.x.x.x.

pub fn get_or_alloc(&self, hostname: &str) -> Result<Ipv4Addr>

Get or allocate a fake IP for hostname.

Errors

Returns Err when the address space is exhausted (>= 16 million entries).

pub fn lookup_hostname(&self, ip: Ipv4Addr) -> Option<String>

Reverse-lookup: hostname for a fake IP.

pub fn is_fake_ip(&self, ip: IpAddr) -> bool

Check whether an IP belongs to this map’s subnet.

pub fn handle_dns_query(&self, packet: &[u8]) -> Option<Vec<u8>>

Parse a raw DNS wire-format query and return a response that assigns a fake IP for the queried hostname.

Returns None if the packet is not a valid single-question A query.

Trait Implementations

impl Clone for DnsMap

fn clone(&self) -> DnsMap

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for DnsMap

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.