%%%----------------------------------------------------------------------
%%% File    : yaws_ctl.erl
  Author   :   <  >
%%% Purpose :
  Created : 29 Apr 2002 by   <  >
%%%----------------------------------------------------------------------


%% some code to remoteley control a running yaws server

-module(yaws_ctl).
-author('').

-include_lib("kernel/include/file.hrl").
-include("../include/yaws.hrl").
-include("../include/yaws_api.hrl").
-include("yaws_debug.hrl").

-export([start/2, actl_trace/1]).
-export([ls/1,hup/1,stop/1,status/1,load/1,
         check/1,trace/1, debug_dump/1, stats/1, running_config/1]).
%% internal
-export([run/1, aloop/3, handle_a/3]).


%% assumes the appropriate file structures
%% are already created with the right perms

start(_GC, FirstTime) when FirstTime == false ->
    ok;
start(GC, true) ->
    proc_lib:start_link(?MODULE, run, [GC]).


run(GC) ->
  First check if there is already a Yaws system running
  with the same  .
    case connect(GC#gconf.id) of
        {ok, Sock, _Key} ->
            %% Not good,
            gen_tcp:close(Sock),
            e("There is already a yaws system running with the same ~n"
              " id <~p> on this computer and this user, ~n"
              " set another id in the yaws conf file ~n",
              [GC#gconf.id]);
        {error, eacces} ->
            %% We're not allowed to open the ctl file
            e("Error reading ~s, you don't have access rights to read it",
              [yaws:ctl_file(GC#gconf.id)]);
        {error, _} ->
            %% Fine, this should be the case
            run_listen(GC)
    end.

rand() ->
    case os:type() of
        {win32, _} ->
            {A1, A2, A3}=now(),
            random:seed(A1, A2, A3),
            random:uniform(1 bsl 64);
        _ ->
            try
                crypto:start(),
                crypto:rand_uniform(0, 1 bsl 64)
            catch
                _:_ ->
                    error_logger:warning_msg("Running without crypto app\n"),
                    {A1, A2, A3}=now(),
                    random:seed(A1, A2, A3),
                    random:uniform(1 bsl 64)
            end
    end.



ctl_args() ->
    [{packet, 2},
     {active, false},
     binary,
     {ip, {127,0,0,1}},
     {reuseaddr, true}].

run_listen(GC) ->
    case gen_tcp:listen(0, ctl_args()) of
        {ok,  L} ->
            case inet:sockname(L) of
                {ok, {_, Port}} ->
                    Key = rand(),
                    case w_ctl_file(GC#gconf.id, Port, Key) of
                        ok ->
                            proc_lib:init_ack(ok),
                            aloop(L, GC, Key);
                        error ->
                            e(
                              "Failed to create/manipulate the ctlfile ~n"
                              "called ~s~n"
                              "Either problems with permissions or "
                              " earlier runs of yaws ~nwith the same id "
                              " <~p> as this, check dir for perms~n",
                              [yaws:ctl_file(GC#gconf.id), GC#gconf.id])
                    end;
                Err ->
                    e("Cannot get sockname for ctlsock: ~p",[Err] )
            end;
        Err ->
            e("Cannot listen on ctl socket, fatal: ~p", [Err])
    end.


e(Fmt, Args) ->
    proc_lib:init_ack({error, io_lib:format(Fmt, Args)}),
    exit(normal).



%% write the control file, set perms of the file
%% so that only this user can read the file
%% That way we're making sure different users
%% cannot manipulate each others webservers
w_ctl_file(Sid, Port, Key) ->
    case catch
             begin
                 F = yaws:ctl_file(Sid),
                 error_logger:info_msg("Ctlfile : ~s~n", [F]),
                 file:write_file(F, io_lib:format("~w.", [{Port,Key}])),
                 {ok, FI} = file:read_file_info(F),
                 ok = file:write_file_info(F, FI#file_info{mode = 8#00600})
             end of
             {'EXIT', _} ->
                 error;
             _ ->
                 ok
         end.



aloop(L, GC, Key) ->
    case gen_tcp:accept(L) of
        {ok, A} ->
            proc_lib:spawn (?MODULE, handle_a, [A, GC, Key]);
        Err ->
            error_logger:format("yaws_ctl failed to accept: ~p~n",
                                [Err]),
            timer:sleep(2000),
            ignore
    end,
    ?MODULE:aloop(L, GC, Key).

handle_a(A, GC, Key) ->
    case gen_tcp:recv(A, 0) of
        {ok, Data} ->
            case catch binary_to_term(Data) of
                {hup, Key} ->
                    Res = yaws:dohup(A),
                    Res;
                {stop, Key} ->
                    error_logger:info_msg("Stopping yaws\n",[]),
                    gen_tcp:send(A, io_lib:format(
                                      "stopping yaws with id=~p\n",
                                      [GC#gconf.id])),
                    file:delete(yaws:ctl_file(GC#gconf.id)),
                    init:stop();
                {{trace, What}, Key} ->
                    Res = actl_trace(What),
                    gen_tcp:send(A, Res),
                    gen_tcp:close(A);
                {status, Key} ->
                    a_status(A),
                    gen_tcp:close(A);
                {{load, Mods}, Key} ->
                    a_load(A, Mods),
                    gen_tcp:close(A);
                {id, Key} ->
                    a_id(A),
                    gen_tcp:close(A);
                {debug_dump, Key} ->
                    a_debug_dump(A),
                    gen_tcp:close(A);
                {stats, Key} ->
                    a_stats(A),
                    gen_tcp:close(A);
                {running_config, Key} ->
                    a_running_config(A),
                    gen_tcp:close(A);
                {Other, Key} ->
                    gen_tcp:send(A, io_lib:format("Other: ~p~n", [Other])),
                    gen_tcp:close(A);
                _Other ->
                    gen_tcp:close(A)

            end;
        {error, _} ->
            gen_tcp:close(A)
    end.


%% We implement this by reloading a patched config
actl_trace(What) ->
    case lists:member(What, [traffic, http, off]) of
        true ->
            {ok, GC, SCs} = yaws_api:getconf(),
            case GC#gconf.trace of
                false when What /= off->
                    yaws_api:setconf(GC#gconf{trace = {true, What}},SCs),
                    io_lib:format(
                      "Turning on trace of ~p to file ~s~n",
                      [What,
                       filename:join([GC#gconf.logdir,
                                      "trace." ++ atom_to_list(What)])]);
                false when What == off ->
                    io_lib:format("Tracing is already turned off ~n",[]);
                {true, _} when What == off ->
                    yaws_api:setconf(GC#gconf{trace = false},SCs),
                    "Turning trace off \n";
                {true, What} ->
                    io_lib:format("Trace of ~p is already turned on, ose 'off' "
                                  "to turn off~n", [What]);
                {true, _Other} ->
                    yaws_api:setconf(GC#gconf{trace = {true, What}},SCs),
                    io_lib:format(
                      "Turning on trace of ~p to file ~s~n",
                      [What,
                       filename:join([GC#gconf.logdir,
                                      "trace." ++ atom_to_list(What)])])
            end;
        false ->
            "Need either http | traffic | off  as argument\n"
    end.



f(Fmt, As) ->
    io_lib:format(Fmt, As).


a_id(Sock) ->
    ID = gen_server:call(yaws_server, id, infinity),
    gen_tcp:send(Sock, ID),
    ok.

a_status(Sock) ->
    gen_tcp:send(Sock, a_status()).
a_status() ->
    try
        {UpTime, L} = yaws_server:stats(),
        {Days, {Hours, Minutes, _Secs}} = UpTime,
        UpStr = f("~n Uptime: ~w Days, ~w Hours, ~w Minutes  ~n",
                  [Days, Hours, Minutes]),

        Header = f("IP Port Connections Sessions Requests~n", []),
        Lines  = lists:map(fun({IP0, Port, Conns, Sess, Reqs}) ->
                                   IP = format_ip(IP0),
                                   f("~s ~p ~p ~p ~p~n",
                                     [IP, Port, Conns, Sess, Reqs])
                           end, L),
        [Header, Lines, UpStr]
    catch
        _:Err ->
            io_lib:format("Cannot get status ~p~n", [Err])
    end.


a_debug_dump(Sock) ->
    gen_tcp:send(Sock, a_status()),
    yaws_debug:do_debug_dump(Sock).


-define(IPV4_FMT, "~p.~p.~p.~p").
-define(IPV6_FMT, "~2.16.0b~2.16.0b:~2.16.0b~2.16.0b:~2.16.0b~2.16.0b:~2.16.0b~2.16.0b").

format_ip(IP) ->
    case size(IP) of
	4 ->
	    {A, B, C, D} = IP,
	    io_lib:format(?IPV4_FMT,
			  [A, B, C, D]);

	8 ->
	    {A, B, C, D, E, F, G, H} = IP,
	    io_lib:format(?IPV6_FMT,
			  [A, B, C, D, E, F, G, H])
    end.


a_running_config(Sock) ->
    gen_tcp:send(Sock, a_running_config()).
a_running_config() ->
    {ok, GC, Groups} = yaws_server:getconf(),
    GcStr = ?format_record(GC, gconf),
    L = lists:map(fun(Group) ->
                          ["** GROUP ** \n",
                           lists:map(
                             fun(SC) ->
                                     ?format_record(SC, sconf)
                             end,
                             Group)
                          ]
                  end, Groups),
    ["** GLOBAL CONF ** \n", GcStr, L].

a_stats(Sock) ->
    gen_tcp:send(Sock, a_stats()).
a_stats() ->
    {ok, _GC, Servers0} = yaws_server:getconf(),
    Servers1 = lists:flatten(Servers0),
    %% io:format("~p~n", [Servers1]),
    Servers2 = parse(Servers1),

    case Servers2 of
	[] ->
	    f("No statistics available~n", []);

	Servers2 ->
	    Stats = fstats(Servers2),
	    Header = f("Host IP Port Hits Sent~n", []),

	    Lines = lists:map(fun({Host, IP0, Port, {Hits, Sent}}) ->
  we do n't use inet_parse : ntoa/1
				      %% since it's not documented
				      IP = format_ip(IP0),
				      f("~s ~s ~p ~p ~p~n",
					[Host, IP, Port, Hits, Sent])
			      end, Stats),
	    [Header, Lines]
    end.

parse(V) ->
    parse(V, []).
parse([], Acc) ->
    Acc;
parse([#sconf{stats=undefined}|Tail], Acc) ->
    parse(Tail, Acc);
parse([#sconf{listen=IP, port=Port, servername=Servername, stats=Stats}|Tail], Acc) ->
    Host = {Servername, IP, Port, Stats},
    parse(Tail, [Host|Acc]).

fstats(S) ->
    fstats(S, []).
fstats([], Acc) ->
    lists:keysort(1, Acc);
fstats([{IP, Port, Server, Stats}|Tail], Acc) ->
    S = {IP, Port, Server, yaws_stats:get(Stats)},
    fstats(Tail, [S|Acc]).


a_load(A, Mods) ->
    case purge(Mods) of
        ok ->
            gen_tcp:send(A, f("~p~n", [loadm(Mods)]));
        Err ->
            gen_tcp:send(A, f("~p~n", [Err]))
    end.

loadm([]) ->
    [];
loadm([M|Ms]) ->
    [code:load_file(M)|loadm(Ms)].

purge(Ms) ->
    case purge(Ms, []) of
        [] -> ok;
        L -> {cannot_purge, L}
    end.

purge([], Ack) ->
    Ack;
purge([M|Ms], Ack) ->
    case code:soft_purge(M) of
        true ->
            purge(Ms, Ack);
        false ->
            purge(Ms, [M|Ack])
    end.

connect(Sid) ->
    connect_file(yaws:ctl_file(Sid)).


%% The ctl file contains the port number the yaws server
%% is listening at and secret key string.

connect_file(CtlFile) ->
    case file:consult(CtlFile) of
        {ok, [{Port, Key}]} ->
            case gen_tcp:connect({127,0,0,1}, Port,
                                 [{active, false},
                                  {reuseaddr, true},
                                  binary,
                                  {packet, 2}], 2000) of
                {ok, Socket} ->
                    case inet:port(Socket) of
                        {ok,Port} ->
                            {error, erefused};
                        _X ->
                            {ok, Socket, Key}
                    end;
                Err ->
                    Err
            end;
        Err ->
            Err
    end.



actl(SID, Term) ->
    case connect(SID) of
        {error, eacces} ->
            io:format("Another user is using the yaws sid <~p>, ~n"
                      "You are not allowd to read the file <~s>, ~n"
                      "specify by <-I id> which yaws system you want"
                      " to control~n",
                      [SID, yaws:ctl_file(SID)]),
            timer:sleep(10),
            erlang:halt(1);
        {error, econnrefused} ->
            io:format("No yaws system responds~n",[]),
            timer:sleep(10),
            erlang:halt(2);
        {error, Reason} ->
            io:format("You failed to read the ctlfile ~s~n"
                      "error was: <~p>~n"
                      "specify by <-I id> which yaws system you want"
                      " to control~n",
                      [yaws:ctl_file(SID), Reason]),
            timer:sleep(10),
            erlang:halt(3);
        {ok, Socket, Key} ->
            gen_tcp:send(Socket, term_to_binary({Term, Key})),
            Ret = s_cmd(Socket, SID, 0),
            timer:sleep(40), %% sucks bigtime, we have no good way to flush io
            case Ret of
                ok when Term == stop ->
  wait for Yaws node to truly stop .
                    case gen_tcp:recv(Socket, 0) of
                        {error, closed} ->
                            erlang:halt(0);
                        Other ->
                            io:format("Stopping yaws: ~p~n", [Other]),
                            erlang:halt(3)
                    end;
                ok ->
                    erlang:halt(0);
                error ->
                    erlang:halt(4)
            end
    end.


s_cmd(Fd, SID, Count) ->
    case gen_tcp:recv(Fd, 0) of
        {ok, Bin} ->
            io:format("~s", [binary_to_list(Bin)]),
            s_cmd(Fd, SID, Count+1);
        {error, closed} when Count > 0 ->
            gen_tcp:close(Fd);
        Err ->
            io_lib:format("yaws server for yaws id <~p> not "
                          "responding: ~p ~n", [SID, Err]),
            error
    end.



%% List existing yaws nodes on this machine for this user
ls(_) ->
    Dir = filename:join([yaws:tmpdir(), "yaws"]),
    case file:list_dir(Dir) of
        {ok, List} ->
            io:format("~-15s~-10s~-10s~n",
                      ["Id", "Status", "Owner"]),
            io:format("-------------------------------------~n",[]),
            lists:foreach(
              fun(IdDir) ->
                      lls(IdDir)
              end, List);
        _ ->
            ok
    end,
    init:stop().


lls(IdDir) ->
    CtlFile = yaws:ctl_file(IdDir),
    case {file:read_file_info(CtlFile),
          file:read_file(CtlFile)} of
        {{ok, FI}, {error, eacces}} ->
            User = yaws:uid_to_name(FI#file_info.uid),
            io:format("~-15s~-10s~-10s~n",
                      [IdDir, "noaccess", User]);
        {{ok, FI}, {ok, _Bin}} ->
            Running = case connect(IdDir) of
                          {ok, Sock, _Key} ->
                              gen_tcp:close(Sock),
                              "running";
                          {error, timeout} ->
                              "hanging??";
                          {error, eacces} ->
                              "noaccess";
                          _Err ->
                              "stopped"
                      end,
            User = yaws:uid_to_name(FI#file_info.uid),
            io:format("~-15s~-10s~-10s~n",
                      [IdDir, Running, User]);
        _ ->
            ok
    end.



%% send a hup (kindof) to the yaws server to make it
%% reload its configuration and clear its caches

hup([SID]) ->
    actl(SID, hup).


%% stop a daemon
stop([SID]) ->
    actl(SID, stop).

%% query a daemon for status/stats
status([SID]) ->
    actl(SID, status).

load(X) ->
    [SID | Modules] = lists:reverse(X),
    actl(SID, {load, Modules}).

check([Id, File| IncludeDirs]) ->
    GC = yaws_config:make_default_gconf(false, undefined),
    GC2 = GC#gconf{include_dir = lists:map(fun(X) -> atom_to_list(X) end,
                                           IncludeDirs),
                   id = atom_to_list(Id)
                  },
    yaws_server:setup_dirs(GC2),
    put(sc, #sconf{}),
    put(gc, GC2),
    put(use_yfile_name, true),
    case yaws_compile:compile_file(atom_to_list(File)) of
        {ok, [{errors, 0}| _Spec]} ->
            timer:sleep(100),erlang:halt(0);
                                                %            init:stop();
        _Other ->
            timer:sleep(100),erlang:halt(1)
                                                %            init:stop()
    end.

%% control a daemon http/traffic tracer
trace([What, SID]) ->
    actl(SID, {trace, What}).

debug_dump([SID]) ->
    actl(SID, debug_dump).

stats([SID]) ->
    actl(SID, stats).
running_config([SID]) ->
    actl(SID, running_config).


----------------------------------------------------------------------
 File    : yaws_ctl.erl
 Purpose :
----------------------------------------------------------------------
 some code to remoteley control a running yaws server
 internal
 assumes the appropriate file structures
 are already created with the right perms
 Not good,
 We're not allowed to open the ctl file
 Fine, this should be the case
 write the control file, set perms of the file
 so that only this user can read the file
 That way we're making sure different users
 cannot manipulate each others webservers
 We implement this by reloading a patched config
 io:format("~p~n", [Servers1]),
 since it's not documented
 The ctl file contains the port number the yaws server
 is listening at and secret key string.
 sucks bigtime, we have no good way to flush io
 List existing yaws nodes on this machine for this user
 send a hup (kindof) to the yaws server to make it
 reload its configuration and clear its caches
 stop a daemon
 query a daemon for status/stats
            init:stop();
            init:stop()
 control a daemon http/traffic tracer
  Author   :   <  >
  Created : 29 Apr 2002 by   <  >



-module(yaws_ctl).
-author('').

-include_lib("kernel/include/file.hrl").
-include("../include/yaws.hrl").
-include("../include/yaws_api.hrl").
-include("yaws_debug.hrl").

-export([start/2, actl_trace/1]).
-export([ls/1,hup/1,stop/1,status/1,load/1,
         check/1,trace/1, debug_dump/1, stats/1, running_config/1]).
-export([run/1, aloop/3, handle_a/3]).



start(_GC, FirstTime) when FirstTime == false ->
    ok;
start(GC, true) ->
    proc_lib:start_link(?MODULE, run, [GC]).


run(GC) ->
  First check if there is already a Yaws system running
  with the same  .
    case connect(GC#gconf.id) of
        {ok, Sock, _Key} ->
            gen_tcp:close(Sock),
            e("There is already a yaws system running with the same ~n"
              " id <~p> on this computer and this user, ~n"
              " set another id in the yaws conf file ~n",
              [GC#gconf.id]);
        {error, eacces} ->
            e("Error reading ~s, you don't have access rights to read it",
              [yaws:ctl_file(GC#gconf.id)]);
        {error, _} ->
            run_listen(GC)
    end.

rand() ->
    case os:type() of
        {win32, _} ->
            {A1, A2, A3}=now(),
            random:seed(A1, A2, A3),
            random:uniform(1 bsl 64);
        _ ->
            try
                crypto:start(),
                crypto:rand_uniform(0, 1 bsl 64)
            catch
                _:_ ->
                    error_logger:warning_msg("Running without crypto app\n"),
                    {A1, A2, A3}=now(),
                    random:seed(A1, A2, A3),
                    random:uniform(1 bsl 64)
            end
    end.



ctl_args() ->
    [{packet, 2},
     {active, false},
     binary,
     {ip, {127,0,0,1}},
     {reuseaddr, true}].

run_listen(GC) ->
    case gen_tcp:listen(0, ctl_args()) of
        {ok,  L} ->
            case inet:sockname(L) of
                {ok, {_, Port}} ->
                    Key = rand(),
                    case w_ctl_file(GC#gconf.id, Port, Key) of
                        ok ->
                            proc_lib:init_ack(ok),
                            aloop(L, GC, Key);
                        error ->
                            e(
                              "Failed to create/manipulate the ctlfile ~n"
                              "called ~s~n"
                              "Either problems with permissions or "
                              " earlier runs of yaws ~nwith the same id "
                              " <~p> as this, check dir for perms~n",
                              [yaws:ctl_file(GC#gconf.id), GC#gconf.id])
                    end;
                Err ->
                    e("Cannot get sockname for ctlsock: ~p",[Err] )
            end;
        Err ->
            e("Cannot listen on ctl socket, fatal: ~p", [Err])
    end.


e(Fmt, Args) ->
    proc_lib:init_ack({error, io_lib:format(Fmt, Args)}),
    exit(normal).



w_ctl_file(Sid, Port, Key) ->
    case catch
             begin
                 F = yaws:ctl_file(Sid),
                 error_logger:info_msg("Ctlfile : ~s~n", [F]),
                 file:write_file(F, io_lib:format("~w.", [{Port,Key}])),
                 {ok, FI} = file:read_file_info(F),
                 ok = file:write_file_info(F, FI#file_info{mode = 8#00600})
             end of
             {'EXIT', _} ->
                 error;
             _ ->
                 ok
         end.



aloop(L, GC, Key) ->
    case gen_tcp:accept(L) of
        {ok, A} ->
            proc_lib:spawn (?MODULE, handle_a, [A, GC, Key]);
        Err ->
            error_logger:format("yaws_ctl failed to accept: ~p~n",
                                [Err]),
            timer:sleep(2000),
            ignore
    end,
    ?MODULE:aloop(L, GC, Key).

handle_a(A, GC, Key) ->
    case gen_tcp:recv(A, 0) of
        {ok, Data} ->
            case catch binary_to_term(Data) of
                {hup, Key} ->
                    Res = yaws:dohup(A),
                    Res;
                {stop, Key} ->
                    error_logger:info_msg("Stopping yaws\n",[]),
                    gen_tcp:send(A, io_lib:format(
                                      "stopping yaws with id=~p\n",
                                      [GC#gconf.id])),
                    file:delete(yaws:ctl_file(GC#gconf.id)),
                    init:stop();
                {{trace, What}, Key} ->
                    Res = actl_trace(What),
                    gen_tcp:send(A, Res),
                    gen_tcp:close(A);
                {status, Key} ->
                    a_status(A),
                    gen_tcp:close(A);
                {{load, Mods}, Key} ->
                    a_load(A, Mods),
                    gen_tcp:close(A);
                {id, Key} ->
                    a_id(A),
                    gen_tcp:close(A);
                {debug_dump, Key} ->
                    a_debug_dump(A),
                    gen_tcp:close(A);
                {stats, Key} ->
                    a_stats(A),
                    gen_tcp:close(A);
                {running_config, Key} ->
                    a_running_config(A),
                    gen_tcp:close(A);
                {Other, Key} ->
                    gen_tcp:send(A, io_lib:format("Other: ~p~n", [Other])),
                    gen_tcp:close(A);
                _Other ->
                    gen_tcp:close(A)

            end;
        {error, _} ->
            gen_tcp:close(A)
    end.


actl_trace(What) ->
    case lists:member(What, [traffic, http, off]) of
        true ->
            {ok, GC, SCs} = yaws_api:getconf(),
            case GC#gconf.trace of
                false when What /= off->
                    yaws_api:setconf(GC#gconf{trace = {true, What}},SCs),
                    io_lib:format(
                      "Turning on trace of ~p to file ~s~n",
                      [What,
                       filename:join([GC#gconf.logdir,
                                      "trace." ++ atom_to_list(What)])]);
                false when What == off ->
                    io_lib:format("Tracing is already turned off ~n",[]);
                {true, _} when What == off ->
                    yaws_api:setconf(GC#gconf{trace = false},SCs),
                    "Turning trace off \n";
                {true, What} ->
                    io_lib:format("Trace of ~p is already turned on, ose 'off' "
                                  "to turn off~n", [What]);
                {true, _Other} ->
                    yaws_api:setconf(GC#gconf{trace = {true, What}},SCs),
                    io_lib:format(
                      "Turning on trace of ~p to file ~s~n",
                      [What,
                       filename:join([GC#gconf.logdir,
                                      "trace." ++ atom_to_list(What)])])
            end;
        false ->
            "Need either http | traffic | off  as argument\n"
    end.



f(Fmt, As) ->
    io_lib:format(Fmt, As).


a_id(Sock) ->
    ID = gen_server:call(yaws_server, id, infinity),
    gen_tcp:send(Sock, ID),
    ok.

a_status(Sock) ->
    gen_tcp:send(Sock, a_status()).
a_status() ->
    try
        {UpTime, L} = yaws_server:stats(),
        {Days, {Hours, Minutes, _Secs}} = UpTime,
        UpStr = f("~n Uptime: ~w Days, ~w Hours, ~w Minutes  ~n",
                  [Days, Hours, Minutes]),

        Header = f("IP Port Connections Sessions Requests~n", []),
        Lines  = lists:map(fun({IP0, Port, Conns, Sess, Reqs}) ->
                                   IP = format_ip(IP0),
                                   f("~s ~p ~p ~p ~p~n",
                                     [IP, Port, Conns, Sess, Reqs])
                           end, L),
        [Header, Lines, UpStr]
    catch
        _:Err ->
            io_lib:format("Cannot get status ~p~n", [Err])
    end.


a_debug_dump(Sock) ->
    gen_tcp:send(Sock, a_status()),
    yaws_debug:do_debug_dump(Sock).


-define(IPV4_FMT, "~p.~p.~p.~p").
-define(IPV6_FMT, "~2.16.0b~2.16.0b:~2.16.0b~2.16.0b:~2.16.0b~2.16.0b:~2.16.0b~2.16.0b").

format_ip(IP) ->
    case size(IP) of
	4 ->
	    {A, B, C, D} = IP,
	    io_lib:format(?IPV4_FMT,
			  [A, B, C, D]);

	8 ->
	    {A, B, C, D, E, F, G, H} = IP,
	    io_lib:format(?IPV6_FMT,
			  [A, B, C, D, E, F, G, H])
    end.


a_running_config(Sock) ->
    gen_tcp:send(Sock, a_running_config()).
a_running_config() ->
    {ok, GC, Groups} = yaws_server:getconf(),
    GcStr = ?format_record(GC, gconf),
    L = lists:map(fun(Group) ->
                          ["** GROUP ** \n",
                           lists:map(
                             fun(SC) ->
                                     ?format_record(SC, sconf)
                             end,
                             Group)
                          ]
                  end, Groups),
    ["** GLOBAL CONF ** \n", GcStr, L].

a_stats(Sock) ->
    gen_tcp:send(Sock, a_stats()).
a_stats() ->
    {ok, _GC, Servers0} = yaws_server:getconf(),
    Servers1 = lists:flatten(Servers0),
    Servers2 = parse(Servers1),

    case Servers2 of
	[] ->
	    f("No statistics available~n", []);

	Servers2 ->
	    Stats = fstats(Servers2),
	    Header = f("Host IP Port Hits Sent~n", []),

	    Lines = lists:map(fun({Host, IP0, Port, {Hits, Sent}}) ->
  we do n't use inet_parse : ntoa/1
				      IP = format_ip(IP0),
				      f("~s ~s ~p ~p ~p~n",
					[Host, IP, Port, Hits, Sent])
			      end, Stats),
	    [Header, Lines]
    end.

parse(V) ->
    parse(V, []).
parse([], Acc) ->
    Acc;
parse([#sconf{stats=undefined}|Tail], Acc) ->
    parse(Tail, Acc);
parse([#sconf{listen=IP, port=Port, servername=Servername, stats=Stats}|Tail], Acc) ->
    Host = {Servername, IP, Port, Stats},
    parse(Tail, [Host|Acc]).

fstats(S) ->
    fstats(S, []).
fstats([], Acc) ->
    lists:keysort(1, Acc);
fstats([{IP, Port, Server, Stats}|Tail], Acc) ->
    S = {IP, Port, Server, yaws_stats:get(Stats)},
    fstats(Tail, [S|Acc]).


a_load(A, Mods) ->
    case purge(Mods) of
        ok ->
            gen_tcp:send(A, f("~p~n", [loadm(Mods)]));
        Err ->
            gen_tcp:send(A, f("~p~n", [Err]))
    end.

loadm([]) ->
    [];
loadm([M|Ms]) ->
    [code:load_file(M)|loadm(Ms)].

purge(Ms) ->
    case purge(Ms, []) of
        [] -> ok;
        L -> {cannot_purge, L}
    end.

purge([], Ack) ->
    Ack;
purge([M|Ms], Ack) ->
    case code:soft_purge(M) of
        true ->
            purge(Ms, Ack);
        false ->
            purge(Ms, [M|Ack])
    end.

connect(Sid) ->
    connect_file(yaws:ctl_file(Sid)).



connect_file(CtlFile) ->
    case file:consult(CtlFile) of
        {ok, [{Port, Key}]} ->
            case gen_tcp:connect({127,0,0,1}, Port,
                                 [{active, false},
                                  {reuseaddr, true},
                                  binary,
                                  {packet, 2}], 2000) of
                {ok, Socket} ->
                    case inet:port(Socket) of
                        {ok,Port} ->
                            {error, erefused};
                        _X ->
                            {ok, Socket, Key}
                    end;
                Err ->
                    Err
            end;
        Err ->
            Err
    end.



actl(SID, Term) ->
    case connect(SID) of
        {error, eacces} ->
            io:format("Another user is using the yaws sid <~p>, ~n"
                      "You are not allowd to read the file <~s>, ~n"
                      "specify by <-I id> which yaws system you want"
                      " to control~n",
                      [SID, yaws:ctl_file(SID)]),
            timer:sleep(10),
            erlang:halt(1);
        {error, econnrefused} ->
            io:format("No yaws system responds~n",[]),
            timer:sleep(10),
            erlang:halt(2);
        {error, Reason} ->
            io:format("You failed to read the ctlfile ~s~n"
                      "error was: <~p>~n"
                      "specify by <-I id> which yaws system you want"
                      " to control~n",
                      [yaws:ctl_file(SID), Reason]),
            timer:sleep(10),
            erlang:halt(3);
        {ok, Socket, Key} ->
            gen_tcp:send(Socket, term_to_binary({Term, Key})),
            Ret = s_cmd(Socket, SID, 0),
            case Ret of
                ok when Term == stop ->
  wait for Yaws node to truly stop .
                    case gen_tcp:recv(Socket, 0) of
                        {error, closed} ->
                            erlang:halt(0);
                        Other ->
                            io:format("Stopping yaws: ~p~n", [Other]),
                            erlang:halt(3)
                    end;
                ok ->
                    erlang:halt(0);
                error ->
                    erlang:halt(4)
            end
    end.


s_cmd(Fd, SID, Count) ->
    case gen_tcp:recv(Fd, 0) of
        {ok, Bin} ->
            io:format("~s", [binary_to_list(Bin)]),
            s_cmd(Fd, SID, Count+1);
        {error, closed} when Count > 0 ->
            gen_tcp:close(Fd);
        Err ->
            io_lib:format("yaws server for yaws id <~p> not "
                          "responding: ~p ~n", [SID, Err]),
            error
    end.



ls(_) ->
    Dir = filename:join([yaws:tmpdir(), "yaws"]),
    case file:list_dir(Dir) of
        {ok, List} ->
            io:format("~-15s~-10s~-10s~n",
                      ["Id", "Status", "Owner"]),
            io:format("-------------------------------------~n",[]),
            lists:foreach(
              fun(IdDir) ->
                      lls(IdDir)
              end, List);
        _ ->
            ok
    end,
    init:stop().


lls(IdDir) ->
    CtlFile = yaws:ctl_file(IdDir),
    case {file:read_file_info(CtlFile),
          file:read_file(CtlFile)} of
        {{ok, FI}, {error, eacces}} ->
            User = yaws:uid_to_name(FI#file_info.uid),
            io:format("~-15s~-10s~-10s~n",
                      [IdDir, "noaccess", User]);
        {{ok, FI}, {ok, _Bin}} ->
            Running = case connect(IdDir) of
                          {ok, Sock, _Key} ->
                              gen_tcp:close(Sock),
                              "running";
                          {error, timeout} ->
                              "hanging??";
                          {error, eacces} ->
                              "noaccess";
                          _Err ->
                              "stopped"
                      end,
            User = yaws:uid_to_name(FI#file_info.uid),
            io:format("~-15s~-10s~-10s~n",
                      [IdDir, Running, User]);
        _ ->
            ok
    end.




hup([SID]) ->
    actl(SID, hup).


stop([SID]) ->
    actl(SID, stop).

status([SID]) ->
    actl(SID, status).

load(X) ->
    [SID | Modules] = lists:reverse(X),
    actl(SID, {load, Modules}).

check([Id, File| IncludeDirs]) ->
    GC = yaws_config:make_default_gconf(false, undefined),
    GC2 = GC#gconf{include_dir = lists:map(fun(X) -> atom_to_list(X) end,
                                           IncludeDirs),
                   id = atom_to_list(Id)
                  },
    yaws_server:setup_dirs(GC2),
    put(sc, #sconf{}),
    put(gc, GC2),
    put(use_yfile_name, true),
    case yaws_compile:compile_file(atom_to_list(File)) of
        {ok, [{errors, 0}| _Spec]} ->
            timer:sleep(100),erlang:halt(0);
        _Other ->
            timer:sleep(100),erlang:halt(1)
    end.

trace([What, SID]) ->
    actl(SID, {trace, What}).

debug_dump([SID]) ->
    actl(SID, debug_dump).

stats([SID]) ->
    actl(SID, stats).
running_config([SID]) ->
    actl(SID, running_config).

