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%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 1997-2016. All Rights Reserved.
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%% http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.
%%
%% %CopyrightEnd%
%%
-module(inet_hosts).
%% Implement gethostbyname gethostbyaddr for inet_hosts table
-export([gethostbyname/1, gethostbyname/2, gethostbyaddr/1]).
-include("inet.hrl").
-include("inet_int.hrl").
gethostbyname(Name) when is_list(Name) ->
gethostbyname(Name,
case inet_db:res_option(inet6) of
true -> inet6;
false -> inet
end);
gethostbyname(Name) when is_atom(Name) ->
gethostbyname(atom_to_list(Name));
gethostbyname(_) -> {error, formerr}.
gethostbyname(Name, Type) when is_list(Name), is_atom(Type) ->
%% Byname has lowercased names while Byaddr keep the name casing.
%% This is to be able to reconstruct the original /etc/hosts entry.
N = inet_db:tolower(Name),
case gethostbyname(N, Type, inet_hosts_byname, inet_hosts_byaddr) of
false ->
case gethostbyname(N, Type,
inet_hosts_file_byname,
inet_hosts_file_byaddr) of
false -> {error,nxdomain};
Hostent -> {ok,Hostent}
end;
Hostent -> {ok,Hostent}
end;
gethostbyname(Name, Type) when is_atom(Name), is_atom(Type) ->
gethostbyname(atom_to_list(Name), Type);
gethostbyname(_, _) -> {error, formerr}.
gethostbyname(Name, Type, Byname, Byaddr) ->
inet_db:res_update_hosts(),
case [I || [I] <- ets:match(Byname, {Name,Type,'$1'})] of
[] -> false;
[IP|_]=IPs ->
%% Use the primary IP address to generate aliases
[Nm|As] = [N || [N] <- ets:match(Byaddr,
{'$1',Type,IP})],
make_hostent(Nm, IPs, As, Type)
end.
gethostbyaddr({A,B,C,D}=IP) when ?ip(A,B,C,D) ->
gethostbyaddr(IP, inet);
%% ipv4 only ipv6 address
gethostbyaddr({0,0,0,0,0,16#ffff=F,G,H}) when ?ip6(0,0,0,0,0,F,G,H) ->
gethostbyaddr({G bsr 8, G band 255, H bsr 8, H band 255});
gethostbyaddr({A,B,C,D,E,F,G,H}=IP) when ?ip6(A,B,C,D,E,F,G,H) ->
gethostbyaddr(IP, inet6);
gethostbyaddr(Addr) when is_list(Addr) ->
case inet_parse:address(Addr) of
{ok,IP} -> gethostbyaddr(IP);
_Error -> {error, formerr}
end;
gethostbyaddr(Addr) when is_atom(Addr) ->
gethostbyaddr(atom_to_list(Addr));
gethostbyaddr(_) -> {error, formerr}.
gethostbyaddr(IP, Type) ->
case gethostbyaddr(IP, Type, inet_hosts_byaddr) of
false ->
case gethostbyaddr(IP, Type, inet_hosts_file_byaddr) of
false -> {error,nxdomain};
Hostent -> {ok,Hostent}
end;
Hostent -> {ok,Hostent}
end.
gethostbyaddr(IP, Type, Byaddr) ->
inet_db:res_update_hosts(),
case [N || [N] <- ets:match(Byaddr, {'$1',Type,IP})] of
[] -> false;
[Nm|As] -> make_hostent(Nm, [IP], As, Type)
end.
make_hostent(Name, Addrs, Aliases, inet) ->
#hostent {
h_name = Name,
h_addrtype = inet,
h_length = 4,
h_addr_list = Addrs,
h_aliases = Aliases
};
make_hostent(Name, Addrs, Aliases, inet6) ->
#hostent {
h_name = Name,
h_addrtype = inet6,
h_length = 16,
h_addr_list = Addrs,
h_aliases = Aliases
}.
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