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add get_by_mdns/2 #98

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add get_by_mdns/2 #98

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19 changes: 19 additions & 0 deletions lib/mdns_lite.ex
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Original file line number Diff line number Diff line change
Expand Up @@ -164,6 +164,25 @@ defmodule MdnsLite do
end
end

@doc """
Lookup a PTR hostname using mDNS

The hostname should be a .local name since the query only goes out via mDNS.
On success, a domain is returned.
"""
@spec get_by_mdns(String.t(), non_neg_integer()) :: any()
def get_by_mdns(hostname, timeout \\ @default_timeout) do
q = MdnsLite.DNS.dns_query(class: :in, type: :ptr, domain: to_charlist(hostname))

case query(q, timeout) do
%{answer: [first | _]} ->
{:ok, dns_rr(first, :domain)}

%{answer: []} ->
{:error, :nxdomain}
end
end

defp to_addr(addr) when is_tuple(addr), do: addr
defp to_addr(<<a, b, c, d>>), do: {a, b, c, d}

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