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%%
%% %CopyrightBegin%
%% 
%% Copyright Ericsson AB 1998-2009. 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(gen_tcp_api_SUITE).

%% Tests the documented API for the gen_tcp functions.  The "normal" cases
%% are not tested here, because they are tested indirectly in this and
%% and other test suites.

-include("test_server.hrl").
-include_lib("kernel/include/inet.hrl").

-export([all/1, init_per_testcase/2, fin_per_testcase/2,
	 t_accept/1, t_connect_timeout/1, t_accept_timeout/1,
	 t_connect/1, t_connect_bad/1,
	 t_recv/1, t_recv_timeout/1, t_recv_eof/1,
	 t_shutdown_write/1, t_shutdown_both/1, t_shutdown_error/1,
	 t_fdopen/1]).

all(suite) -> [t_accept, t_connect, t_recv, t_shutdown_write,
	      t_shutdown_both, t_shutdown_error, t_fdopen].

init_per_testcase(_Func, Config) ->
    Dog = test_server:timetrap(test_server:seconds(60)),
    [{watchdog, Dog}|Config].
fin_per_testcase(_Func, Config) ->
    Dog = ?config(watchdog, Config),
    test_server:timetrap_cancel(Dog).

%%% gen_tcp:accept/1,2

t_accept(suite) -> [t_accept_timeout].

t_accept_timeout(doc) -> "Test that gen_tcp:accept/2 (with timeout) works.";
t_accept_timeout(suite) -> [];
t_accept_timeout(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, []),
    ?line timeout({gen_tcp, accept, [L, 200]}, 0.2, 1.0).

%%% gen_tcp:connect/X

t_connect(suite) -> [t_connect_timeout, t_connect_bad].

t_connect_timeout(doc) -> "Test that gen_tcp:connect/4 (with timeout) works.";
t_connect_timeout(Config) when is_list(Config) ->
    %%?line BadAddr = {134,138,177,16},
    %%?line TcpPort = 80,
    ?line {ok, BadAddr} =  unused_ip(),
    ?line TcpPort = 45638,
    ?line ok = io:format("Connecting to ~p, port ~p", [BadAddr, TcpPort]),
    ?line connect_timeout({gen_tcp,connect,[BadAddr,TcpPort,[],200]}, 0.2, 5.0).

t_connect_bad(doc) ->
    ["Test that gen_tcp:connect/3 handles non-existings hosts, and other ",
     "invalid things."];
t_connect_bad(suite) -> [];
t_connect_bad(Config) when is_list(Config) ->
    ?line NonExistingPort = 45638,		% Not in use, I hope.
    ?line {error, Reason1} = gen_tcp:connect(localhost, NonExistingPort, []),
    ?line io:format("Error for connection attempt to port not in use: ~p",
		    [Reason1]),

    ?line {error, Reason2} = gen_tcp:connect("non-existing-host-xxx", 7, []),
    ?line io:format("Error for connection attempt to non-existing host: ~p",
		    [Reason2]),
    ok.


%%% gen_tcp:recv/X

t_recv(suite) -> [t_recv_timeout, t_recv_eof].

t_recv_timeout(doc) -> "Test that gen_tcp:recv/3 (with timeout works).";
t_recv_timeout(suite) -> [];
t_recv_timeout(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, []),
    ?line {ok, Port} = inet:port(L),
    ?line {ok, Client} = gen_tcp:connect(localhost, Port, [{active, false}]),
    ?line {ok, _A} = gen_tcp:accept(L),
    ?line timeout({gen_tcp, recv, [Client, 0, 200]}, 0.2, 5.0).

t_recv_eof(doc) -> "Test that end of file on a socket is reported correctly.";
t_recv_eof(suite) -> [];
t_recv_eof(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, []),
    ?line {ok, Port} = inet:port(L),
    ?line {ok, Client} = gen_tcp:connect(localhost, Port, [{active, false}]),
    ?line {ok, A} = gen_tcp:accept(L),
    ?line ok = gen_tcp:close(A),
    ?line {error, closed} = gen_tcp:recv(Client, 0),
    ok.

%%% gen_tcp:shutdown/2

t_shutdown_write(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, []),
    ?line {ok, Port} = inet:port(L),
    ?line {ok, Client} = gen_tcp:connect(localhost, Port, [{active, false}]),
    ?line {ok, A} = gen_tcp:accept(L),
    ?line ok = gen_tcp:shutdown(A, write),
    ?line {error, closed} = gen_tcp:recv(Client, 0),
    ok.

t_shutdown_both(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, []),
    ?line {ok, Port} = inet:port(L),
    ?line {ok, Client} = gen_tcp:connect(localhost, Port, [{active, false}]),
    ?line {ok, A} = gen_tcp:accept(L),
    ?line ok = gen_tcp:shutdown(A, read_write),
    ?line {error, closed} = gen_tcp:recv(Client, 0),
    ok.

t_shutdown_error(Config) when is_list(Config) ->
    ?line {ok, L} = gen_tcp:listen(0, []),
    ?line {error, enotconn} = gen_tcp:shutdown(L, read_write),
    ?line ok = gen_tcp:close(L),
    ?line {error, closed} = gen_tcp:shutdown(L, read_write),
    ok.
    

%%% gen_tcp:fdopen/2

t_fdopen(Config) when is_list(Config) ->
    ?line Question = "Aaaa... Long time ago in a small town in Germany,",
    ?line Answer = "there was a shoemaker, Schumacher was his name.",
    ?line {ok, L} = gen_tcp:listen(0, [{active, false}]),
    ?line {ok, Port} = inet:port(L),
    ?line {ok, Client} = gen_tcp:connect(localhost, Port, [{active, false}]),
    ?line {ok, A} = gen_tcp:accept(L),
    ?line {ok, FD} = prim_inet:getfd(A),
    ?line {ok, Server} = gen_tcp:fdopen(FD, []),
    ?line ok = gen_tcp:send(Client, Question),
    ?line {ok, Question} = gen_tcp:recv(Server, length(Question), 2000),
    ?line ok = gen_tcp:send(Server, Answer),
    ?line {ok, Answer} = gen_tcp:recv(Client, length(Answer), 2000),
    ?line ok = gen_tcp:close(Client),
    ?line {error,closed} = gen_tcp:recv(A, 1, 2000),
    ?line ok = gen_tcp:close(Server),
    ?line ok = gen_tcp:close(A),
    ?line ok = gen_tcp:close(L),
    ok.



%%% Utilities

%% Calls M:F/length(A), which should return a timeout error, and complete
%% within the given time.

timeout({M,F,A}, Lower, Upper) ->
    case test_server:timecall(M, F, A) of
	{Time, Result} when Time < Lower ->
	    test_server:fail({too_short_time, Time, Result});
	{Time, Result} when Time > Upper ->
	    test_server:fail({too_long_time, Time, Result});
	{_, {error, timeout}} ->
	    ok;
	{_, Result} ->
	    test_server:fail({unexpected_result, Result})
    end.

connect_timeout({M,F,A}, Lower, Upper) ->
    case test_server:timecall(M, F, A) of
	{Time, Result} when Time < Lower ->
	    case Result of
		{error,econnrefused=E} ->
		    {comment,"Not tested -- got error "++atom_to_list(E)};
		{error,enetunreach=E} ->
		    {comment,"Not tested -- got error "++atom_to_list(E)};
		{ok,Socket} -> % What the...
		    Pinfo = erlang:port_info(Socket),
		    Db = inet_db:lookup_socket(Socket),
		    Peer = inet:peername(Socket),
		    test_server:fail({too_short_time, Time, 
				      [Result,Pinfo,Db,Peer]});
		_ ->
		    test_server:fail({too_short_time, Time, Result})
	    end;
	{Time, Result} when Time > Upper ->
	    test_server:fail({too_long_time, Time, Result});
	{_, {error, timeout}} ->
	    ok;
	{_, Result} ->
	    test_server:fail({unexpected_result, Result})
    end.

%% Try to obtain an unused IP address in the local network.

unused_ip() ->
    ?line {ok, Host} = inet:gethostname(),
    ?line {ok, Hent} = inet:gethostbyname(Host),
    ?line #hostent{h_addr_list=[{A, B, C, _D}|_]} = Hent,
    %% Note: In our net, addresses below 16 are reserved for routers and
    %% other strange creatures.
    ?line IP = unused_ip(A, B, C, 16),
    io:format("we = ~p, unused_ip = ~p~n", [Hent, IP]),
    IP.

unused_ip(_, _, _, 255) -> error;
unused_ip(A, B, C, D) ->
    case inet:gethostbyaddr({A, B, C, D}) of
	{ok, _} -> unused_ip(A, B, C, D+1);
	{error, _} -> {ok, {A, B, C, D}}
    end.