File 2386-ssh-Unified-way-of-starting-listening-sock... of Package erlang

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File 2386-ssh-Unified-way-of-starting-listening-sockets.patch of Package erlang (Revision a2c746346df91f7eba485155dba10e85)

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From da7902412f1e77b8241c0bacbeac2d6013e8f345 Mon Sep 17 00:00:00 2001
From: Hans Nilsson <hans@erlang.org>
Date: Thu, 2 Mar 2017 16:37:54 +0100
Subject: [PATCH 06/13] ssh: Unified way of starting listening sockets

---
 lib/ssh/src/ssh.erl          | 215 ++++++++++++++++++-------------------------
 lib/ssh/src/ssh_acceptor.erl | 106 ++++++++++-----------
 2 files changed, 136 insertions(+), 185 deletions(-)

diff --git a/lib/ssh/src/ssh.erl b/lib/ssh/src/ssh.erl
index c1be9f732..c13955679 100644
--- a/lib/ssh/src/ssh.erl
+++ b/lib/ssh/src/ssh.erl
@@ -132,13 +132,12 @@ connect(Host, Port, UserOptions, Timeout) when is_integer(Port),
             SocketOpts = [{active,false} | ?GET_OPT(socket_options,Options)],
 	    try Transport:connect(Host, Port, SocketOpts, ConnectionTimeout) of
 		{ok, Socket} ->
-		    Opts = ?PUT_INTERNAL_OPT([{user_pid,self()}, {host,Host}], Options),
+		    Opts = ?PUT_INTERNAL_OPT([{user_pid,self()}, {host,fmt_host(Host)}], Options),
 		    ssh_connection_handler:start_connection(client, Socket, Opts, Timeout);
 		{error, Reason} ->
 		    {error, Reason}
 	    catch
 		exit:{function_clause, _F} ->
-                    io:format('function_clause ~p~n',[_F]),
 		    {error, {options, {transport, TransportOpts}}};
 		exit:badarg ->
 		    {error, {options, {socket_options, SocketOpts}}}
@@ -311,16 +310,15 @@ handle_daemon_args(Host, UserOptions0) ->
 %%%----------------------------------------------------------------
 valid_socket_to_use(Socket, {tcp,_,_}) ->
     %% Is this tcp-socket a valid socket?
-    case {is_tcp_socket(Socket),
-          {ok,[{active,false}]} == inet:getopts(Socket, [active])
-         }
+    try {is_tcp_socket(Socket),
+         {ok,[{active,false}]} == inet:getopts(Socket, [active])
+        }
     of
-        {true, true} ->
-            ok;
-        {true, false} ->
-            {error, not_passive_mode};
-        _ ->
-            {error, not_tcp_socket}
+        {true,  true} -> ok;
+        {true, false} -> {error, not_passive_mode};
+        _ ->             {error, not_tcp_socket}
+    catch
+        _:_ ->           {error, bad_socket}
     end;
 
 valid_socket_to_use(_, {L4,_,_}) ->
@@ -340,13 +338,7 @@ start_daemon(_, _, {error,Error}) ->
 start_daemon(socket, Socket, Options) ->
     case valid_socket_to_use(Socket, ?GET_OPT(transport,Options)) of
         ok ->
-            try
-                do_start_daemon(Socket, Options)
-            catch
-                throw:bad_fd -> {error,bad_fd};
-                throw:bad_socket -> {error,bad_socket};
-                _C:_E -> {error,{cannot_start_daemon,_C,_E}}
-            end;
+            start_daemon(inet:sockname(Socket), Socket, Options);
         {error,SockError} ->
             {error,SockError}
     end;
@@ -355,136 +347,107 @@ start_daemon(Host, Port, Options) ->
     try
         do_start_daemon(Host, Port, Options)
     catch
-        throw:bad_fd -> {error,bad_fd};
-        throw:bad_socket -> {error,bad_socket};
-        _C:_E -> {error,{cannot_start_daemon,_C,_E}}
+        throw:bad_fd ->
+            {error,bad_fd};
+        throw:bad_socket ->
+            {error,bad_socket};
+        error:{badmatch,{error,Error}} ->
+            {error,Error};
+        _C:_E ->
+            {error,{cannot_start_daemon,_C,_E}}
     end.
 
+%%%----------------------------------------------------------------
+do_start_daemon({error,Error}, _, _) ->
+    {error,Error};
 
-do_start_daemon(Socket, Options) ->
-    {ok, {IP,Port}} =
-	try {ok,_} = inet:sockname(Socket)
-	catch
-	    _:_ -> throw(bad_socket)
-	end,
-    Host = fmt_host(IP),
-    Opts = ?PUT_INTERNAL_OPT([{connected_socket, Socket},
-                              {address, Host},
-                              {port, Port},
-                              {role, server}], Options),
-    
-    Profile = ?GET_OPT(profile, Options),
-    case ssh_system_sup:system_supervisor(Host, Port, Profile) of
-	undefined ->
-	    try sshd_sup:start_child(Opts) of
-		{error, {already_started, _}} ->
-		    {error, eaddrinuse};
-		Result = {ok,_} ->
-		    call_ssh_acceptor_handle_connection(Host, Port, Opts, Socket, Result);
-		Result = {error, _} ->
-		    Result
-	    catch
-		exit:{noproc, _} ->
-		    {error, ssh_not_started}
-	    end;
-	Sup  ->
-	    AccPid = ssh_system_sup:acceptor_supervisor(Sup),
-	    case ssh_acceptor_sup:start_child(AccPid, Opts) of
-		{error, {already_started, _}} ->
-		    {error, eaddrinuse};
-		{ok, _} ->
-		    call_ssh_acceptor_handle_connection(Host, Port, Opts, Socket, {ok,Sup});
-		Other ->
-		    Other
-	    end
-    end.
+do_start_daemon({ok, {IP,Port}}, Socket, Options0) ->
+    finalize_start(fmt_host(IP),
+                   Port,
+                   ?PUT_INTERNAL_OPT({connected_socket, Socket}, Options0),
+                   fun(Opts, DefaultResult) ->
+                           try ssh_acceptor:handle_established_connection(
+                                 ?GET_INTERNAL_OPT(address, Opts),
+                                 ?GET_INTERNAL_OPT(port, Opts),
+                                 Opts, 
+                                 Socket)
+                           of
+                               {error,Error} ->
+                                   {error,Error};
+                               _ ->
+                                   DefaultResult
+                           catch
+                               C:R ->
+                                   {error,{could_not_start_connection,{C,R}}}
+                           end
+                   end);
 
 do_start_daemon(Host0, Port0, Options0) ->
-    {Host,Port1} =
-	try
-	    case ?GET_SOCKET_OPT(fd, Options0) of
-		undefined ->
-		    {Host0,Port0};
-		Fd when Port0==0 ->
-		    find_hostport(Fd)
-	    end
-	catch
-	    _:_ -> throw(bad_fd)
-	end,
-    {Port, WaitRequestControl, Options1} =
-	case Port1 of
-	    0 -> %% Allocate the socket here to get the port number...
-		{ok,LSock} = ssh_acceptor:callback_listen(0, Options0),
-		{ok,{_,LPort}} = inet:sockname(LSock),
-		{LPort,
-		 LSock,
-		 ?PUT_INTERNAL_OPT({lsocket,{LSock,self()}}, Options0)
-		};
-	    _ ->
-		{Port1, false, Options0}
-	end,
+    {{Host,Port}, ListenSocket} =
+        open_listen_socket(Host0, Port0, Options0),
+
+    %% Now Host,Port is what to use for the supervisor to register its name,
+    %% and ListenSocket is for listening on connections. But it is still owned
+    %% by self()...
+
+    finalize_start(Host, Port,
+                   ?PUT_INTERNAL_OPT({lsocket,{ListenSocket,self()}}, Options0),
+                   fun(Opts, Result) ->
+                           {_, Callback, _} = ?GET_OPT(transport, Opts),
+                           receive
+                               {request_control, ListenSocket, ReqPid} ->
+                                   ok = Callback:controlling_process(ListenSocket, ReqPid),
+                                   ReqPid ! {its_yours,ListenSocket},
+                                   Result
+                           end
+                   end).
+
+
+open_listen_socket(Host0, Port0, Options0) ->
+    case ?GET_SOCKET_OPT(fd, Options0) of
+        undefined ->
+            {ok,LSock} = ssh_acceptor:listen(Port0, Options0),
+            {ok,{_,LPort}} = inet:sockname(LSock),
+            {{fmt_host(Host0),LPort}, LSock};
+        
+        Fd when is_integer(Fd) ->
+            %% Do gen_tcp:listen with the option {fd,Fd}:
+            {ok,LSock} = ssh_acceptor:listen(0, Options0),
+            {ok,{LHost,LPort}} = inet:sockname(LSock),
+            {{fmt_host(LHost),LPort}, LSock}
+    end.
+
+%%%----------------------------------------------------------------
+finalize_start(Host, Port, Options0, F) ->
     Options = ?PUT_INTERNAL_OPT([{address, Host},
                                  {port, Port},
-                                 {role, server}], Options1),
-    Profile = ?GET_OPT(profile, Options0),
+                                 {role, server}], Options0),
+    Profile = ?GET_OPT(profile, Options),
     case ssh_system_sup:system_supervisor(Host, Port, Profile) of
 	undefined ->
 	    try sshd_sup:start_child(Options) of
 		{error, {already_started, _}} ->
 		    {error, eaddrinuse};
+		{error, Error} ->
+                    {error, Error};
 		Result = {ok,_} ->
-		    sync_request_control(WaitRequestControl, Options),
-		    Result;
-		Result = {error, _} ->
-		    Result
+                    F(Options, Result)
 	    catch
 		exit:{noproc, _} ->
 		    {error, ssh_not_started}
 	    end;
-	Sup ->
+	Sup  ->
 	    AccPid = ssh_system_sup:acceptor_supervisor(Sup),
 	    case ssh_acceptor_sup:start_child(AccPid, Options) of
 		{error, {already_started, _}} ->
 		    {error, eaddrinuse};
+		{error, Error} ->
+                    {error, Error};
 		{ok, _} ->
-		    sync_request_control(WaitRequestControl, Options),
-		    {ok, Sup};
-		Other ->
-		    Other
+                    F(Options, {ok,Sup})
 	    end
     end.
 
-call_ssh_acceptor_handle_connection(Host, Port, Options, Socket, DefaultResult) ->
-    {_, Callback, _} = ?GET_OPT(transport, Options),
-    try ssh_acceptor:handle_connection(Callback, Host, Port, Options, Socket)
-    of
-        {error,Error} -> {error,Error};
-        _ -> DefaultResult
-    catch
-        C:R -> {error,{could_not_start_connection,{C,R}}}
-    end.
-             
-
-sync_request_control(false, _Options) ->
-    ok;
-sync_request_control(LSock, Options) ->
-    {_, Callback, _} = ?GET_OPT(transport, Options),
-    receive
-	{request_control,LSock,ReqPid} ->
-	    ok = Callback:controlling_process(LSock, ReqPid),
-	    ReqPid ! {its_yours,LSock},
-	    ok
-    end.
-
-find_hostport(Fd) ->
-    %% Using internal functions inet:open/8 and inet:close/0.
-    %% Don't try this at home unless you know what you are doing!
-    {ok,S} = inet:open(Fd, {0,0,0,0}, 0, [], tcp, inet, stream, inet_tcp),
-    {ok, HostPort} = inet:sockname(S),
-    ok = inet:close(S),
-    HostPort.
-
-fmt_host({A,B,C,D}) ->
-    lists:concat([A,".",B,".",C,".",D]);
-fmt_host(T={_,_,_,_,_,_,_,_}) ->
-    lists:flatten(string:join([io_lib:format("~.16B",[A]) || A <- tuple_to_list(T)], ":")).
+%%%----------------------------------------------------------------
+fmt_host(IP)  when is_tuple(IP) ->  inet:ntoa(IP);
+fmt_host(Str) when is_list(Str) -> Str.
diff --git a/lib/ssh/src/ssh_acceptor.erl b/lib/ssh/src/ssh_acceptor.erl
index 4943f062b..f9e228021 100644
--- a/lib/ssh/src/ssh_acceptor.erl
+++ b/lib/ssh/src/ssh_acceptor.erl
@@ -27,8 +27,8 @@
 %% Internal application API
 -export([start_link/4,
 	 number_of_connections/1,
-	 callback_listen/2,
-	 handle_connection/5]).
+	 listen/2,
+	 handle_established_connection/4]).
 
 %% spawn export  
 -export([acceptor_init/5, acceptor_loop/6]).
@@ -42,40 +42,57 @@ start_link(Port, Address, Options, AcceptTimeout) ->
     Args = [self(), Port, Address, Options, AcceptTimeout],
     proc_lib:start_link(?MODULE, acceptor_init, Args).
 
+%%%----------------------------------------------------------------
+number_of_connections(SystemSup) ->
+    length([X || 
+	       {R,X,supervisor,[ssh_subsystem_sup]} <- supervisor:which_children(SystemSup),
+	       is_pid(X),
+	       is_reference(R)
+	  ]).
+
+%%%----------------------------------------------------------------
+listen(Port, Options) ->
+    {_, Callback, _} = ?GET_OPT(transport, Options),
+    SockOpts = [{active, false}, {reuseaddr,true} | ?GET_OPT(socket_options, Options)],
+    case Callback:listen(Port, SockOpts) of
+	{error, nxdomain} ->
+	    Callback:listen(Port, lists:delete(inet6, SockOpts));
+	{error, enetunreach} ->
+	    Callback:listen(Port, lists:delete(inet6, SockOpts));
+	{error, eafnosupport} ->
+	    Callback:listen(Port, lists:delete(inet6, SockOpts));
+	Other ->
+	    Other
+    end.
+
+%%%----------------------------------------------------------------
+handle_established_connection(Address, Port, Options, Socket) ->
+    {_, Callback, _} = ?GET_OPT(transport, Options),
+    handle_connection(Callback, Address, Port, Options, Socket).
+
 %%--------------------------------------------------------------------
 %%% Internal functions
 %%--------------------------------------------------------------------
 acceptor_init(Parent, Port, Address, Opts, AcceptTimeout) ->
-    {_, Callback, _} =  ?GET_OPT(transport, Opts),
     try
-        {LSock0,SockOwner0} = ?GET_INTERNAL_OPT(lsocket, Opts),
-        true = is_pid(SockOwner0),
-        {ok,{_,Port}} = inet:sockname(LSock0),
-        {LSock0, SockOwner0}
+        ?GET_INTERNAL_OPT(lsocket, Opts)
     of
         {LSock, SockOwner} ->
-            %% Use existing socket
-            proc_lib:init_ack(Parent, {ok, self()}),
-	    request_ownership(LSock, SockOwner),
-	    acceptor_loop(Callback, Port, Address, Opts, LSock, AcceptTimeout)
-    catch
-        error:{badkey,lsocket} ->
-            %% Open new socket
-            try
-                socket_listen(Port, Opts)
-            of
-                {ok, ListenSocket} ->
+            case inet:sockname(LSock) of
+                {ok,{_,Port}} -> % A usable, open LSock
                     proc_lib:init_ack(Parent, {ok, self()}),
-                    acceptor_loop(Callback, 
-                                  Port, Address, Opts, ListenSocket, AcceptTimeout);
-                {error,Error} ->
-                    proc_lib:init_ack(Parent, Error),
-                    {error,Error}
-            catch
-                _:_ ->
-                    {error,listen_socket_failed}
-            end;
+                    request_ownership(LSock, SockOwner),
+                    {_, Callback, _} =  ?GET_OPT(transport, Opts),
+                    acceptor_loop(Callback, Port, Address, Opts, LSock, AcceptTimeout);
 
+                {error,_} -> % Not open, a restart
+                    {ok,NewLSock} = listen(Port, Opts),
+                    proc_lib:init_ack(Parent, {ok, self()}),
+                    Opts1 = ?DELETE_INTERNAL_OPT(lsocket, Opts),
+                    {_, Callback, _} =  ?GET_OPT(transport, Opts1),
+                    acceptor_loop(Callback, Port, Address, Opts1, NewLSock, AcceptTimeout)
+            end
+    catch
         _:_ ->
             {error,use_existing_socket_failed}
     end.
@@ -87,30 +104,7 @@ request_ownership(LSock, SockOwner) ->
 	{its_yours,LSock} -> ok
     end.
     
-   
-socket_listen(Port0, Opts) ->
-    Port = case ?GET_SOCKET_OPT(fd, Opts) of
-               undefined -> Port0;
-               _ -> 0
-           end,
-    callback_listen(Port, Opts).
-
-
-callback_listen(Port, Opts0) ->
-    {_, Callback, _} = ?GET_OPT(transport, Opts0),
-    Opts = ?PUT_SOCKET_OPT([{active, false}, {reuseaddr,true}], Opts0),
-    SockOpts = ?GET_OPT(socket_options, Opts),
-    case Callback:listen(Port, SockOpts) of
-	{error, nxdomain} ->
-	    Callback:listen(Port, lists:delete(inet6, SockOpts));
-	{error, enetunreach} ->
-	    Callback:listen(Port, lists:delete(inet6, SockOpts));
-	{error, eafnosupport} ->
-	    Callback:listen(Port, lists:delete(inet6, SockOpts));
-	Other ->
-	    Other
-    end.
-    
+%%%----------------------------------------------------------------    
 acceptor_loop(Callback, Port, Address, Opts, ListenSocket, AcceptTimeout) ->
     case (catch Callback:accept(ListenSocket, AcceptTimeout)) of
 	{ok, Socket} ->
@@ -127,6 +121,7 @@ acceptor_loop(Callback, Port, Address, Opts, ListenSocket, AcceptTimeout) ->
 				  ListenSocket, AcceptTimeout)
     end.
 
+%%%----------------------------------------------------------------
 handle_connection(Callback, Address, Port, Options, Socket) ->
     Profile =  ?GET_OPT(profile, Options),
     SystemSup = ssh_system_sup:system_supervisor(Address, Port, Profile),
@@ -158,7 +153,7 @@ handle_connection(Callback, Address, Port, Options, Socket) ->
 	    {error,max_sessions}
     end.
 
-
+%%%----------------------------------------------------------------
 handle_error(timeout) ->
     ok;
 
@@ -185,10 +180,3 @@ handle_error(Reason) ->
     error_logger:error_report(String),
     exit({accept_failed, String}).    
 
-
-number_of_connections(SystemSup) ->
-    length([X || 
-	       {R,X,supervisor,[ssh_subsystem_sup]} <- supervisor:which_children(SystemSup),
-	       is_pid(X),
-	       is_reference(R)
-	  ]).
-- 
2.12.2

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File 2386-ssh-Unified-way-of-starting-listening-sockets.patch of Package erlang (Revision a2c746346df91f7eba485155dba10e85)

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