#[non_exhaustive]
pub struct ResolverOpts {
Show 17 fields pub ndots: usize, pub timeout: Duration, pub attempts: usize, pub rotate: bool, pub check_names: bool, pub edns0: bool, pub validate: bool, pub ip_strategy: LookupIpStrategy, pub cache_size: usize, pub use_hosts_file: bool, pub positive_min_ttl: Option<Duration>, pub negative_min_ttl: Option<Duration>, pub positive_max_ttl: Option<Duration>, pub negative_max_ttl: Option<Duration>, pub num_concurrent_reqs: usize, pub preserve_intermediates: bool, pub try_tcp_on_error: bool,
}
Expand description

Configuration for the Resolver

Fields (Non-exhaustive)

This struct is marked as non-exhaustive
Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.
ndots: usize

Sets the number of dots that must appear (unless it’s a final dot representing the root) that must appear before a query is assumed to include the TLD. The default is one, which means that www would never be assumed to be a TLD, and would always be appended to either the search

timeout: Duration

Specify the timeout for a request. Defaults to 5 seconds

attempts: usize

Number of retries after lookup failure before giving up. Defaults to 2

rotate: bool

Rotate through the resource records in the response (if there is more than one for a given name)

check_names: bool

Validate the names in the response, not implemented don’t really see the point unless you need to support badly configured DNS

edns0: bool

Enable edns, for larger records

validate: bool

Use DNSSec to validate the request

ip_strategy: LookupIpStrategy

The ip_strategy for the Resolver to use when lookup Ipv4 or Ipv6 addresses

cache_size: usize

Cache size is in number of records (some records can be large)

use_hosts_file: bool

Check /ect/hosts file before dns requery (only works for unix like OS)

positive_min_ttl: Option<Duration>

Optional minimum TTL for positive responses.

If this is set, any positive responses with a TTL lower than this value will have a TTL of positive_min_ttl instead. Otherwise, this will default to 0 seconds.

negative_min_ttl: Option<Duration>

Optional minimum TTL for negative (NXDOMAIN) responses.

If this is set, any negative responses with a TTL lower than this value will have a TTL of negative_min_ttl instead. Otherwise, this will default to 0 seconds.

positive_max_ttl: Option<Duration>

Optional maximum TTL for positive responses.

If this is set, any positive responses with a TTL higher than this value will have a TTL of positive_max_ttl instead. Otherwise, this will default to MAX_TTL seconds.

negative_max_ttl: Option<Duration>

Optional maximum TTL for negative (NXDOMAIN) responses.

If this is set, any negative responses with a TTL higher than this value will have a TTL of negative_max_ttl instead. Otherwise, this will default to MAX_TTL seconds.

num_concurrent_reqs: usize

Number of concurrent requests per query

Where more than one nameserver is configured, this configures the resolver to send queries to a number of servers in parallel. Defaults to 2; 0 or 1 will execute requests serially.

preserve_intermediates: bool

Preserve all intermediate records in the lookup response, suchas CNAME records

try_tcp_on_error: bool

Try queries over TCP if they fail over UDP.

Trait Implementations

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Default values for the Resolver configuration.

This follows the resolv.conf defaults as defined in the Linux man pages

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This method tests for !=.

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