%%
%% %CopyrightBegin%
%%
%% Copyright Ericsson AB 2009-2011. All Rights Reserved.
%%
%% The contents of this file are subject to the Erlang Public License,
%% Version 1.1, (the "License"); you may not use this file except in
%% compliance with the License. You should have received a copy of the
%% Erlang Public License along with this software. If not, it can be
%% retrieved online at http://www.erlang.org/.
%%
%% Software distributed under the License is distributed on an "AS IS"
%% basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
%% the License for the specific language governing rights and limitations
%% under the License.
%%
%% %CopyrightEnd%
%%
-module(inet_res_SUITE).
-include_lib("common_test/include/ct.hrl").
-include("test_server_line.hrl").
-include_lib("kernel/include/inet.hrl").
-include_lib("kernel/src/inet_dns.hrl").
-export([all/0, suite/0,groups/0,init_per_suite/1, end_per_suite/1,
init_per_group/2,end_per_group/2,
init_per_testcase/2, end_per_testcase/2]).
-export([basic/1, resolve/1, edns0/1, txt_record/1, files_monitor/1,
last_ms_answer/1]).
-export([
gethostbyaddr/0, gethostbyaddr/1,
gethostbyaddr_v6/0, gethostbyaddr_v6/1,
gethostbyname/0, gethostbyname/1,
gethostbyname_v6/0, gethostbyname_v6/1,
getaddr/0, getaddr/1,
getaddr_v6/0, getaddr_v6/1,
ipv4_to_ipv6/0, ipv4_to_ipv6/1,
host_and_addr/0, host_and_addr/1
]).
-define(RUN_NAMED, "run-named").
suite() -> [{ct_hooks,[ts_install_cth]}].
all() ->
[basic, resolve, edns0, txt_record, files_monitor,
last_ms_answer,
gethostbyaddr, gethostbyaddr_v6, gethostbyname,
gethostbyname_v6, getaddr, getaddr_v6, ipv4_to_ipv6,
host_and_addr].
groups() ->
[].
init_per_suite(Config) ->
Config.
end_per_suite(_Config) ->
ok.
init_per_group(_GroupName, Config) ->
Config.
end_per_group(_GroupName, Config) ->
Config.
zone_dir(TC) ->
case TC of
basic -> otptest;
resolve -> otptest;
edns0 -> otptest;
files_monitor -> otptest;
last_ms_answer -> otptest;
_ -> undefined
end.
init_per_testcase(Func, Config) ->
PrivDir = ?config(priv_dir, Config),
DataDir = ?config(data_dir, Config),
try ns_init(zone_dir(Func), PrivDir, DataDir) of
NsSpec ->
Lookup = inet_db:res_option(lookup),
inet_db:set_lookup([file,dns]),
case NsSpec of
{_,{IP,Port},_} ->
inet_db:ins_alt_ns(IP, Port);
_ -> ok
end,
Dog = test_server:timetrap(test_server:seconds(20)),
[{nameserver,NsSpec},{res_lookup,Lookup},{watchdog,Dog}|Config]
catch
SkipReason ->
{skip,SkipReason}
end.
end_per_testcase(_Func, Config) ->
test_server:timetrap_cancel(?config(watchdog, Config)),
inet_db:set_lookup(?config(res_lookup, Config)),
NsSpec = ?config(nameserver, Config),
case NsSpec of
{_,{IP,Port},_} ->
inet_db:del_alt_ns(IP, Port);
_ -> ok
end,
ns_end(NsSpec, ?config(priv_dir, Config)).
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Nameserver control
ns(Config) ->
{_ZoneDir,NS,_P} = ?config(nameserver, Config),
NS.
ns_init(ZoneDir, PrivDir, DataDir) ->
case os:type() of
{unix,_} when ZoneDir =:= undefined -> undefined;
{unix,_} ->
PortNum = case {os:type(),os:version()} of
{{unix,solaris},{M,V,_}} when M =< 5, V < 10 ->
11895 + random:uniform(100);
_ ->
{ok,S} = gen_udp:open(0, [{reuseaddr,true}]),
{ok,PNum} = inet:port(S),
gen_udp:close(S),
PNum
end,
RunNamed = filename:join(DataDir, ?RUN_NAMED),
NS = {{127,0,0,1},PortNum},
P = erlang:open_port({spawn_executable,RunNamed},
[{cd,PrivDir},
{line,80},
{args,["127.0.0.1",
integer_to_list(PortNum),
atom_to_list(ZoneDir)]},
stderr_to_stdout,
eof]),
ns_start(ZoneDir, PrivDir, NS, P);
_ ->
throw("Only run on Unix")
end.
ns_start(ZoneDir, PrivDir, NS, P) ->
case ns_collect(P) of
eof ->
erlang:error(eof);
"Running: "++_ ->
{ZoneDir,NS,P};
"Error: "++Error ->
ns_printlog(filename:join([PrivDir,ZoneDir,"named.log"])),
throw(Error);
_ ->
ns_start(ZoneDir, PrivDir, NS, P)
end.
ns_end(undefined, _PrivDir) -> undefined;
ns_end({ZoneDir,_NS,P}, PrivDir) ->
port_command(P, ["quit",io_lib:nl()]),
ns_stop(P),
ns_printlog(filename:join([PrivDir,ZoneDir,"named.log"])),
ok.
ns_stop(P) ->
case ns_collect(P) of
eof ->
erlang:port_close(P);
_ ->
ns_stop(P)
end.
ns_collect(P) ->
ns_collect(P, []).
ns_collect(P, Buf) ->
receive
{P,{data,{eol,L}}} ->
Line = lists:flatten(lists:reverse(Buf, [L])),
io:format("~s", [Line]),
Line;
{P,{data,{noeol,L}}} ->
ns_collect(P, [L|Buf]);
{P,eof} ->
eof
end.
ns_printlog(Fname) ->
io:format("Name server log file contents:~n", []),
case file:read_file(Fname) of
{ok,Bin} ->
io:format("~s~n", [Bin]);
_ ->
ok
end.
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Behaviour modifying nameserver proxy
proxy_start(TC, {NS,P}) ->
Tag = make_ref(),
Parent = self(),
Pid =
spawn_link(
fun () ->
try proxy_start(TC, NS, P, Parent, Tag)
catch C:X ->
io:format(
"~w: ~w:~p ~p~n",
[self(),C,X,erlang:get_stacktrace()])
end
end),
receive {started,Tag,Port} ->
ProxyNS = {{127,0,0,1},Port},
{proxy,Pid,Tag,ProxyNS}
end.
proxy_start(TC, NS, P, Parent, Tag) ->
{ok,Outbound} = gen_udp:open(0, [binary]),
ok = gen_udp:connect(Outbound, NS, P),
{ok,Inbound} = gen_udp:open(0, [binary]),
{ok,Port} = inet:port(Inbound),
Parent ! {started,Tag,Port},
proxy(TC, Outbound, NS, P, Inbound).
%% To provoke the last_ms_answer bug (OTP-9221) the proxy
%% * Relays the query to the right nameserver
%% * Intercepts the reply but holds it until the timer that
%% was started when receiving the query fires.
%% * Repeats the reply with incorrect query ID a number of
%% times with a short interval.
%% * Sends the correct reply, to give a correct test result
%% after bug correction.
%%
%% The repetition of an incorrect answer with tight interval will keep
%% inet_res in an inner loop in the code that decrements the remaining
%% time until it hits 0 which triggers a crash, if the outer timeout
%% parameter to inet_res:resolve is so short that it runs out during
%% these repetitions.
proxy(last_ms_answer, Outbound, NS, P, Inbound) ->
receive
{udp,Inbound,SrcIP,SrcPort,Data} ->
Time =
inet_db:res_option(timeout) div inet_db:res_option(retry),
Tag = erlang:make_ref(),
erlang:send_after(Time - 10, self(), {time,Tag}),
ok = gen_udp:send(Outbound, NS, P, Data),
receive
{udp,Outbound,NS,P,Reply} ->
{ok,Msg} = inet_dns:decode(Reply),
Hdr = inet_dns:msg(Msg, header),
Id = inet_dns:header(Hdr, id),
BadHdr =
inet_dns:make_header(Hdr, id, (Id+1) band 16#ffff),
BadMsg = inet_dns:make_msg(Msg, header, BadHdr),
BadReply = inet_dns:encode(BadMsg),
receive
{time,Tag} ->
proxy__last_ms_answer(
Inbound, SrcIP, SrcPort, BadReply, Reply, 30)
end
end
end.
proxy__last_ms_answer(Socket, IP, Port, _, Reply, 0) ->
ok = gen_udp:send(Socket, IP, Port, Reply);
proxy__last_ms_answer(Socket, IP, Port, BadReply, Reply, N) ->
ok = gen_udp:send(Socket, IP, Port, BadReply),
receive after 1 -> ok end,
proxy__last_ms_answer(Socket, IP, Port, BadReply, Reply, N-1).
proxy_wait({proxy,Pid,_,_}) ->
Mref = erlang:monitor(process, Pid),
receive {'DOWN',Mref,_,_,_} -> ok end.
proxy_ns({proxy,_,_,ProxyNS}) -> ProxyNS.
%%
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
basic(doc) ->
["Lookup an A record with different API functions"];
basic(Config) when is_list(Config) ->
NS = ns(Config),
Name = "ns.otptest",
IP = {127,0,0,254},
%%
%% nslookup
{ok,Msg1} = inet_res:nslookup(Name, in, a, [NS]),
io:format("~p~n", [Msg1]),
[RR1] = inet_dns:msg(Msg1, anlist),
IP = inet_dns:rr(RR1, data),
Bin1 = inet_dns:encode(Msg1),
%%io:format("Bin1 = ~w~n", [Bin1]),
{ok,Msg1} = inet_dns:decode(Bin1),
%%
%% resolve
{ok,Msg2} = inet_res:resolve(Name, in, a, [{nameservers,[NS]},verbose]),
io:format("~p~n", [Msg2]),
[RR2] = inet_dns:msg(Msg2, anlist),
IP = inet_dns:rr(RR2, data),
Bin2 = inet_dns:encode(Msg2),
%%io:format("Bin2 = ~w~n", [Bin2]),
{ok,Msg2} = inet_dns:decode(Bin2),
%%
%% lookup
[IP] = inet_res:lookup(Name, in, a, [{nameservers,[NS]},verbose]),
%%
%% gethostbyname
{ok,#hostent{h_addr_list=[IP]}} = inet_res:gethostbyname(Name),
%%
%% getbyname
{ok,#hostent{h_addr_list=[IP]}} = inet_res:getbyname(Name, a),
ok.
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
resolve(doc) ->
["Lookup different records using resolve/2..4"];
resolve(Config) when is_list(Config) ->
NS = ns(Config),
Domain = "otptest",
RDomain4 = "0.0.127.in-addr.arpa",
RDomain6 = "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa",
Name = "resolve."++Domain,
L = [{in,a,Name,[{127,0,0,28}],undefined},
{in,aaaa,Name,[{0,0,0,0,0,0,32512,28}],undefined},
{in,cname,"cname."++Name,[Name],undefined},
{in,a,"cname."++Name,[Name,{127,0,0,28}],undefined},
{in,ns,"ns."++Name,[],[Name]},
{in,soa,Domain,[],[{"ns.otptest","lsa.otptest",1,60,10,300,30}]},
%% WKS: protocol TCP (6), services (bits) TELNET (23) and SMTP (25)
{in,wks,"wks."++Name,[{{127,0,0,28},6,<<0,0,1,64>>}],undefined},
{in,ptr,"28."++RDomain4,[Name],undefined},
{in,ptr,"c.1.0.0.0.0.f.7."++RDomain6,[Name],undefined},
{in,hinfo,Name,[{"BEAM","Erlang/OTP"}],undefined},
{in,mx,RDomain4,[{10,"mx."++Domain}],undefined},
{in,srv,"_srv._tcp."++Name,[{10,3,4711,Name}],undefined},
{in,naptr,"naptr."++Name,
[{10,5,"s","http","","_srv._tcp."++Name}],undefined},
{in,txt,"txt."++Name,
[["Hej ","du ","glade "],["ta ","en ","spade!"]],undefined},
{in,mb,"mb."++Name,["mx."++Name],undefined},
{in,mg,"mg."++Name,["lsa."++Domain],undefined},
{in,mr,"mr."++Name,["lsa."++Domain],undefined},
{in,minfo,"minfo."++Name,
[{"minfo-owner."++Name,"minfo-bounce."++Name}],undefined},
{in,any,"cname."++Name,[Name],undefined},
{in,any,Name,[{127,0,0,28},
{0,0,0,0,0,0,32512,28},
{"BEAM","Erlang/OTP"}],undefined}
],
resolve([{edns,false},{nameservers,[NS]}], L),
resolve([{edns,0},{nameservers,[NS]}], L).
resolve(_Opts, []) -> ok;
resolve(Opts, [{Class,Type,Name,Answers,Authority}=Q|Qs]) ->
io:format("Query: ~p~nOptions: ~p~n", [Q,Opts]),
{ok,Msg} = inet_res:resolve(Name, Class, Type, Opts),
AnList =
if
Answers =/= undefined ->
lists:sort(Answers);
true ->
undefined
end,
NsList =
if
Authority =/= undefined ->
lists:sort(Authority);
true ->
undefined
end,
case {lists:sort
([inet_dns:rr(RR, data) || RR <- inet_dns:msg(Msg, anlist)]),
lists:sort
([inet_dns:rr(RR, data) || RR <- inet_dns:msg(Msg, nslist)])} of
{AnList,NsList} ->
ok;
{NsList,AnList} when Type =:= ns ->
%% This whole case statement is kind of inside out just
%% to accept this case when some legacy DNS resolvers
%% return the answer to a NS query in the answer section
%% instead of in the authority section.
ok;
{AnList,_} when NsList =:= undefined ->
ok;
{_,NsList} when AnList =:= undefined ->
ok
end,
Buf = inet_dns:encode(Msg),
{ok,Msg} = inet_dns:decode(Buf),
resolve(Opts, Qs).
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
edns0(doc) ->
["Test EDNS and truncation"];
edns0(Config) when is_list(Config) ->
NS = ns(Config),
Domain = "otptest",
Filler = "-5678901234567890123456789012345678.",
MXs = lists:sort([{10,"mx."++Domain},
{20,"mx1"++Filler++Domain},
{20,"mx2"++Filler++Domain},
{20,"mx3"++Filler++Domain},
{20,"mx4"++Filler++Domain},
{20,"mx5"++Filler++Domain},
{20,"mx6"++Filler++Domain},
{20,"mx7"++Filler++Domain}]),
false = inet_db:res_option(edns), % ASSERT
true = inet_db:res_option(udp_payload_size) >= 1280, % ASSERT
%% These will fall back to TCP
MXs = lists:sort(inet_res:lookup(Domain, in, mx, [{nameservers,[NS]},verbose])),
%%
{ok,#hostent{h_addr_list=As}} = inet_res:getbyname(Domain++".", mx),
MXs = lists:sort(As),
%%
{ok,Msg1} = inet_res:resolve(Domain, in, mx),
MXs = lists:sort(inet_res_filter(inet_dns:msg(Msg1, anlist), in, mx)),
%% There should be no OPT record in the answer
[] = [RR || RR <- inet_dns:msg(Msg1, arlist),
inet_dns:rr(RR, type) =:= opt],
Buf1 = inet_dns:encode(Msg1),
{ok,Msg1} = inet_dns:decode(Buf1),
%%
%% Use EDNS - should not need to fall back to TCP
%% there is no way to tell from the outside.
%%
{ok,Msg2} = inet_res:resolve(Domain, in, mx, [{edns,0}]),
MXs = lists:sort(inet_res_filter(inet_dns:msg(Msg2, anlist), in, mx)),
Buf2 = inet_dns:encode(Msg2),
{ok,Msg2} = inet_dns:decode(Buf2),
case [RR || RR <- inet_dns:msg(Msg2, arlist),
inet_dns:rr(RR, type) =:= opt] of
[OptRR] ->
io:format("~p~n", [inet_dns:rr(OptRR)]),
ok;
[] ->
case os:type() of
{unix,sunos} ->
case os:version() of
{M,V,_} when M < 5; M == 5, V =< 8 ->
%% In our test park only known platform
%% with an DNS resolver that can not do
%% EDNS0.
{comment,"No EDNS0"}
end
end
end.
inet_res_filter(Anlist, Class, Type) ->
[inet_dns:rr(RR, data) || RR <- Anlist,
inet_dns:rr(RR, type) =:= Type,
inet_dns:rr(RR, class) =:= Class].
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
txt_record(suite) ->
[];
txt_record(doc) ->
["Tests TXT records"];
txt_record(Config) when is_list(Config) ->
D1 = "cslab.ericsson.net",
D2 = "mail1.cslab.ericsson.net",
{ok,#dns_rec{anlist=[RR1]}} =
inet_res:nslookup(D1, in, txt),
io:format("~p~n", [RR1]),
{ok,#dns_rec{anlist=[RR2]}} =
inet_res:nslookup(D2, in, txt),
io:format("~p~n", [RR2]),
#dns_rr{domain=D1, class=in, type=txt, data=A1} = RR1,
#dns_rr{domain=D2, class=in, type=txt, data=A2} = RR2,
case [lists:flatten(A2)] of
A1 = [[_|_]] -> ok
end,
ok.
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
files_monitor(suite) ->
[];
files_monitor(doc) ->
["Tests monitoring of /etc/hosts and /etc/resolv.conf, but not them"];
files_monitor(Config) when is_list(Config) ->
Search = inet_db:res_option(search),
HostsFile = inet_db:res_option(hosts_file),
ResolvConf = inet_db:res_option(resolv_conf),
Inet6 = inet_db:res_option(inet6),
try do_files_monitor(Config)
after
inet_db:res_option(search, Search),
inet_db:res_option(resolv_conf, ResolvConf),
inet_db:res_option(hosts_file, HostsFile),
inet_db:res_option(inet6, Inet6)
end.
do_files_monitor(Config) ->
Dir = ?config(priv_dir, Config),
{ok,Hostname} = inet:gethostname(),
FQDN =
case inet_db:res_option(domain) of
"" ->
Hostname;
_ ->
Hostname++"."++inet_db:res_option(domain)
end,
HostsFile = filename:join(Dir, "files_monitor_hosts"),
ResolvConf = filename:join(Dir, "files_monitor_resolv.conf"),
ok = inet_db:res_option(resolv_conf, ResolvConf),
ok = inet_db:res_option(hosts_file, HostsFile),
[] = inet_db:res_option(search),
{ok,#hostent{h_name = Hostname,
h_addrtype = inet,
h_length = 4,
h_addr_list = [{127,0,0,1}]}} = inet:gethostbyname(Hostname),
{ok,#hostent{h_name = FQDN,
h_addrtype = inet,
h_length = 4,
h_addr_list = [{127,0,0,1}]}} = inet:gethostbyname(FQDN),
{error,nxdomain} = inet_res:gethostbyname(Hostname),
{error,nxdomain} = inet_res:gethostbyname(FQDN),
{ok,{127,0,0,10}} = inet:getaddr("mx.otptest", inet),
{ok,{0,0,0,0,0,0,32512,28}} = inet:getaddr("resolve.otptest", inet6),
{ok,#hostent{h_name = Hostname,
h_addrtype = inet6,
h_length = 16,
h_addr_list = [{0,0,0,0,0,0,0,1}]}} =
inet:gethostbyname(Hostname, inet6),
{ok,#hostent{h_name = FQDN,
h_addrtype = inet6,
h_length = 16,
h_addr_list = [{0,0,0,0,0,0,0,1}]}} =
inet:gethostbyname(FQDN, inet6),
{error,nxdomain} = inet_res:gethostbyname("resolve"),
%% XXX inet does not honour res_option inet6, might be a problem?
%% therefore inet_res is called here
ok = inet_db:res_option(inet6, true),
{ok,#hostent{h_name = "resolve.otptest",
h_addrtype = inet6,
h_length = 16,
h_addr_list = [{0,0,0,0,0,0,32512,28}]}} =
inet_res:gethostbyname("resolve.otptest"),
{error,nxdomain} = inet_hosts:gethostbyname("files_monitor"),
ok = file:write_file(ResolvConf, "search otptest\n"),
ok = file:write_file(HostsFile, "::100 files_monitor\n"),
receive after 7000 -> ok end, % RES_FILE_UPDATE_TM in inet_res.hrl is 5 s
{ok,#hostent{h_name = "resolve.otptest",
h_addrtype = inet6,
h_length = 16,
h_addr_list = [{0,0,0,0,0,0,32512,28}]}} =
inet_res:gethostbyname("resolve.otptest"),
["otptest"] = inet_db:res_option(search),
{ok,#hostent{h_name = "files_monitor",
h_addrtype = inet6,
h_length = 16,
h_addr_list = [{0,0,0,0,0,0,0,256}]}} =
inet_hosts:gethostbyname("files_monitor"),
ok = inet_db:res_option(inet6, false),
{ok,#hostent{h_name = "resolve.otptest",
h_addrtype = inet,
h_length = 4,
h_addr_list = [{127,0,0,28}]}} =
inet:gethostbyname("resolve.otptest"),
ok.
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
last_ms_answer(doc) ->
["Answer just when timeout is triggered (OTP-9221)"];
last_ms_answer(Config) when is_list(Config) ->
NS = ns(Config),
Name = "ns.otptest",
%%IP = {127,0,0,254},
Time = inet_db:res_option(timeout) div inet_db:res_option(retry),
PSpec = proxy_start(last_ms_answer, NS),
ProxyNS = proxy_ns(PSpec),
%%
%% resolve; whith short timeout to trigger Timeout =:= 0 in inet_res
{error,timeout} =
inet_res:resolve(
Name, in, a, [{nameservers,[ProxyNS]},verbose], Time + 10),
%%
proxy_wait(PSpec),
ok.
%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Compatibility tests. Call the inet_SUITE tests, but with
%% lookup = [file,dns] instead of [native]
gethostbyaddr() -> inet_SUITE:t_gethostbyaddr().
gethostbyaddr(Config) -> inet_SUITE:t_gethostbyaddr(Config).
gethostbyaddr_v6() -> inet_SUITE:t_gethostbyaddr_v6().
gethostbyaddr_v6(Config) -> inet_SUITE:t_gethostbyaddr_v6(Config).
gethostbyname() -> inet_SUITE:t_gethostbyname().
gethostbyname(Config) -> inet_SUITE:t_gethostbyname(Config).
gethostbyname_v6() -> inet_SUITE:t_gethostbyname_v6().
gethostbyname_v6(Config) -> inet_SUITE:t_gethostbyname_v6(Config).
getaddr() -> inet_SUITE:t_getaddr().
getaddr(Config) -> inet_SUITE:t_getaddr(Config).
getaddr_v6() -> inet_SUITE:t_getaddr_v6().
getaddr_v6(Config) -> inet_SUITE:t_getaddr_v6(Config).
ipv4_to_ipv6() -> inet_SUITE:ipv4_to_ipv6().
ipv4_to_ipv6(Config) -> inet_SUITE:ipv4_to_ipv6(Config).
host_and_addr() -> inet_SUITE:host_and_addr().
host_and_addr(Config) -> inet_SUITE:host_and_addr(Config).
