Struct c_ares::Options

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pub struct Options { /* private fields */ }

Expand description

Used to configure the behaviour of the name resolver.

Implementations§

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impl Options

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pub fn new() -> Self

Returns a fresh Options, on which no values are set.

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pub fn set_flags(&mut self, flags: Flags) -> &mut Self

Set flags controlling the behaviour of the resolver. The available flags are documented here.

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pub fn set_timeout(&mut self, ms: u32) -> &mut Self

Set the number of milliseconds each name server is given to respond to a query on the first try. (After the first try, the timeout algorithm becomes more complicated, but scales linearly with the value of timeout). The default is 2000ms.

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pub fn set_tries(&mut self, tries: u32) -> &mut Self

Set the number of tries the resolver will try contacting each name server before giving up. The default is three tries.

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pub fn set_ndots(&mut self, ndots: u32) -> &mut Self

Set the number of dots which must be present in a domain name for it to be queried for “as is” prior to querying for it with the default domain extensions appended. The default value is 1 unless set otherwise by resolv.conf or the RES_OPTIONS environment variable.

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pub fn set_udp_port(&mut self, udp_port: u16) -> &mut Self

Set the UDP port to use for queries. The default value is 53, the standard name service port.

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pub fn set_tcp_port(&mut self, tcp_port: u16) -> &mut Self

Set the TCP port to use for queries. The default value is 53, the standard name service port.

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pub fn set_domains(&mut self, domains: &[&str]) -> &mut Self

Set the domains to search, instead of the domains specified in resolv.conf or the domain derived from the kernel hostname variable.

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pub fn set_lookups(&mut self, lookups: &str) -> &mut Self

Set the lookups to perform for host queries. lookups should be set to a string of the characters “b” or “f”, where “b” indicates a DNS lookup and “f” indicates a lookup in the hosts file.

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pub fn set_socket_state_callback<F>(&mut self, callback: F) -> &mut Self
where F: FnMut(Socket, bool, bool) + Send + 'static,

Set the callback function to be invoked when a socket changes state.

callback(socket, read, write) will be called when a socket changes state:

read is set to true if the socket should listen for read events
write is set to true if the socket should listen for write events.

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pub fn set_sock_send_buffer_size(&mut self, size: u32) -> &mut Self

Set the socket send buffer size.

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pub fn set_sock_receive_buffer_size(&mut self, size: u32) -> &mut Self

Set the socket receive buffer size.

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pub fn set_rotate(&mut self) -> &mut Self

Configure round robin selection of nameservers.

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pub fn set_no_rotate(&mut self) -> &mut Self

Prevent round robin selection of nameservers.

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pub fn set_ednspsz(&mut self, size: u32) -> &mut Self

Set the EDNS packet size.

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pub fn set_resolvconf_path(&mut self, resolvconf_path: &str) -> &mut Self

The path to use for reading the resolv.conf file. The resolvconf_path should be set to a path string, and will be honoured on *nix like systems. The default is /etc/resolv.conf.