View Source MdnsLite (mdns_lite v0.8.10)
MdnsLite is a simple, limited, no frills mDNS implementation
Advertising hostnames and services is generally done using the application
config. See MdnsLite.Options for documentation.
To change the advertised hostnames or services at runtime, see set_host/1,
add_mdns_service/1 and remove_mdns_service/1.
MdnsLite's mDNS record tables and caches can be inspected using
MdnsLite.Info if you're having trouble.
Finally, check out the MdnsLite README.md for more information.
Summary
Types
A user-visible name for a service advertisement
mDNS service description
A user-specified ID for referring to a service
Functions
Start advertising a service
Lookup a hostname using mDNS
Stop advertising a service
Set the list of host names
Updates the advertised instance name for service records
Types
@type instance_name() :: String.t() | :unspecified
A user-visible name for a service advertisement
@type service() :: %{ :id => service_id(), :instance_name => instance_name(), :port => 1..65535, optional(:txt_payload) => [String.t()], optional(:priority) => 0..255, optional(:protocol) => String.t(), optional(:transport) => String.t(), optional(:type) => String.t(), optional(:weight) => 0..255 }
mDNS service description
Keys include:
:id- an atom for referring to this service (only required if you want to reference the service at runtime):port- the TCP/UDP port number for the service (required):transport- the transport protocol. E.g.,"tcp"(specify this and:protocol, or:type) *:protocol- the application protocol. E.g.,"ssh"(specify this and:transport, or:type):type- the transport/protocol to advertize. E.g.,"_ssh._tcp"(only needed if:protocoland:transportaren't specified):weight- the service weight. Defaults to0. (optional):priority- the service priority. Defaults to0. (optional):txt_payload- a list of strings to advertise
Example:
%{id: :my_ssh, port: 22, protocol: "ssh", transport: "tcp"}A user-specified ID for referring to a service
Atoms are recommended, but binaries are still supported since they were used in the past.
Functions
@spec add_mdns_service(service()) :: :ok
Start advertising a service
Services can be added at compile-time via the :services key in the mdns_lite
application environment or they can be added at runtime using this function.
See the service type for information on what's needed.
Example:
iex> service = %{
id: :my_web_server,
protocol: "http",
transport: "tcp",
port: 80
}
iex> MdnsLite.add_mdns_service(service)
:ok@spec gethostbyname(String.t(), non_neg_integer()) :: {:ok, :inet.ip_address()} | {:error, any()}
Lookup a hostname using mDNS
The hostname should be a .local name since the query only goes out via mDNS. On success, an IP address is returned.
@spec remove_mdns_service(service_id()) :: :ok
Stop advertising a service
Example:
iex> MdnsLite.remove_mdns_service(:my_ssh)
:ok@spec set_hosts([:hostname | String.t()]) :: :ok
Set the list of host names
This replaces the list of hostnames that MdnsLite will respond to. The first hostname in the list is special. Service advertisements will use it. The remainder are aliases.
Hostnames should not have the ".local" extension. MdnsLite will add it.
To specify the hostname returned by :inet.gethostname/0, use :hostname.
To make MdnsLite respond to queries for "<hostname>.local" and "nerves.local", run this:
iex> MdnsLite.set_hosts([:hostname, "nerves"])
:ok@spec set_instance_name(instance_name()) :: :ok
Updates the advertised instance name for service records
To specify the first hostname specified in hosts, use :unspecified