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File 2201-ssh-make-ssh-daemon-choose-port-when-Port-0-in-the-a.patch of Package erlang (Revision 20341d3ca8beab07b502d76ce8eb2b1a)

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From b90f22861404f2a2cdd305055c786bb73464af01 Mon Sep 17 00:00:00 2001
From: Hans Nilsson <hans@erlang.org>
Date: Thu, 7 Apr 2016 16:30:35 +0200
Subject: [PATCH 1/2] ssh: make ssh:daemon choose port when Port=0 in the
 arguments

---
 lib/ssh/doc/src/ssh.xml          | 15 ++++++-
 lib/ssh/src/ssh.erl              | 85 +++++++++++++++++++++++++++++++---------
 lib/ssh/src/ssh_acceptor.erl     | 45 +++++++++++++++++----
 lib/ssh/src/ssh_acceptor_sup.erl |  5 +--
 lib/ssh/src/ssh_system_sup.erl   |  9 +++--
 5 files changed, 124 insertions(+), 35 deletions(-)

diff --git a/lib/ssh/doc/src/ssh.xml b/lib/ssh/doc/src/ssh.xml
index 8505574..a9e843c 100644
--- a/lib/ssh/doc/src/ssh.xml
+++ b/lib/ssh/doc/src/ssh.xml
@@ -359,7 +359,8 @@
 </type>
 <desc>
 Starts a server listening for SSH connections on the given
- port.
+ port. If the <c>Port</c> is 0, a random free port is selected. See
+	<seealso marker="#daemon_info/1">daemon_info/1</seealso> about how to find the selected port number.
 	Options:
 <taglist>
 	 <tag><c><![CDATA[{inet, inet | inet6}]]></c></tag>
@@ -680,6 +681,18 @@
 </func>
 
 <func>
+ <name>daemon_info(Daemon) -> {ok, [{port,Port}]} | {error,Error}</name>
+ <fsummary>Get info about a daemon</fsummary>
+ <type>
+ <v>Port = integer()</v>
+	<v>Error = bad_daemon_ref</v>
+ </type>
+ <desc>
+	Returns a key-value list with information about the daemon. For now, only the listening port is returned. This is intended for the case the daemon is started with the port set to 0.
+ </desc>
+ </func>
+
+ <func>
 <name>default_algorithms() -> algs_list()</name>
 <fsummary>Get a list declaring the supported algorithms</fsummary>
 <desc>
diff --git a/lib/ssh/src/ssh.erl b/lib/ssh/src/ssh.erl
index d0121e7..5c5d594 100644
--- a/lib/ssh/src/ssh.erl
+++ b/lib/ssh/src/ssh.erl
@@ -30,6 +30,7 @@
 -export([start/0, start/1, stop/0, connect/3, connect/4, close/1, connection_info/2,
 	 channel_info/3,
 	 daemon/1, daemon/2, daemon/3,
+	 daemon_info/1,
 	 default_algorithms/0,
 	 stop_listener/1, stop_listener/2, stop_listener/3,
 	 stop_daemon/1, stop_daemon/2, stop_daemon/3,
@@ -153,6 +154,19 @@ daemon(HostAddr, Port, Options0) ->
 start_daemon(Host, Port, Options, Inet).
 
 %%--------------------------------------------------------------------
+daemon_info(Pid) ->
+ case catch ssh_system_sup:acceptor_supervisor(Pid) of
+	AsupPid when is_pid(AsupPid) ->
+	 [Port] =
+		[Prt || {{ssh_acceptor_sup,any,Prt,default},
+			 _WorkerPid,worker,[ssh_acceptor]} <- supervisor:which_children(AsupPid)],
+	 {ok, [{port,Port}]};
+
+	_ ->
+	 {error,bad_daemon_ref}
+ end.
+
+%%--------------------------------------------------------------------
 -spec stop_listener(pid()) -> ok.
 -spec stop_listener(inet:ip_address(), integer()) -> ok.
 %%
@@ -243,32 +257,52 @@ start_daemon(Host, Port, Options, Inet) ->
 	 end
 end.
 
-do_start_daemon(Host0, Port0, Options, SocketOptions) ->
- {Host,Port} = try
-	 case proplists:get_value(fd, SocketOptions) of
-		 undefined ->
-		 {Host0,Port0};
-		 Fd when Port0==0 ->
-		 find_hostport(Fd);
-		 _ ->
-		 {Host0,Port0}
-	 end
-	 catch
-	 _:_ -> throw(bad_fd)
-	 end,
- Profile = proplists:get_value(profile, Options, ?DEFAULT_PROFILE),
+do_start_daemon(Host0, Port0, SshOptions, SocketOptions) ->
+ {Host,Port1} = 
+	try
+	 case proplists:get_value(fd, SocketOptions) of
+		undefined ->
+		 {Host0,Port0};
+		Fd when Port0==0 ->
+		 find_hostport(Fd);
+		_ ->
+		 {Host0,Port0}
+	 end
+	catch
+	 _:_ -> throw(bad_fd)
+	end,
+ Profile = proplists:get_value(profile, SshOptions, ?DEFAULT_PROFILE),
+ {Port, WaitRequestControl, Opts} =
+	case Port1 of
+	 0 -> %% Allocate the socket here to get the port number...
+		{_, Callback, _} = 
+		 proplists:get_value(transport, SshOptions, {tcp, gen_tcp, tcp_closed}),
+		{ok,LSock} = ssh_acceptor:callback_listen(Callback, 0, SocketOptions),
+		{ok,{_,LPort}} = inet:sockname(LSock),
+		{LPort, 
+		 {LSock,Callback}, 
+		 [{lsocket,LSock},{lsock_owner,self()}]
+		};
+	 _ ->
+		{Port1, false, []}
+	end,
 case ssh_system_sup:system_supervisor(Host, Port, Profile) of
 	undefined ->
 	 %% It would proably make more sense to call the
 	 %% address option host but that is a too big change at the
 	 %% monent. The name is a legacy name!
 	 try sshd_sup:start_child([{address, Host}, 
-				 {port, Port}, {role, server},
+				 {port, Port},
+				 {role, server},
 				 {socket_opts, SocketOptions}, 
-				 {ssh_opts, Options}]) of
+				 {ssh_opts, SshOptions}
+				 | Opts]) of
 		{error, {already_started, _}} ->
 		 {error, eaddrinuse};
-		Result = {Code, _} when (Code == ok) or (Code == error) ->
+		Result = {ok,_} ->
+		 sync_request_control(WaitRequestControl),
+		 Result;
+		Result = {error, _} ->
 		 Result
 	 catch
 		exit:{noproc, _} ->
@@ -277,18 +311,31 @@ do_start_daemon(Host0, Port0, Options, SocketOptions) ->
 	Sup ->
 	 AccPid = ssh_system_sup:acceptor_supervisor(Sup),
 	 case ssh_acceptor_sup:start_child(AccPid, [{address, Host},
-						 {port, Port}, {role, server},
+						 {port, Port},
+						 {role, server},
 						 {socket_opts, SocketOptions},
-						 {ssh_opts, Options}]) of
+						 {ssh_opts, SshOptions}
+						 | Opts]) of
 		{error, {already_started, _}} ->
 		 {error, eaddrinuse};
 		{ok, _} ->
+		 sync_request_control(WaitRequestControl),
 		 {ok, Sup};
 		Other ->
 		 Other
 	 end
 end.
 
+sync_request_control(false) ->
+ ok;
+sync_request_control({LSock,Callback}) ->
+ 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!
diff --git a/lib/ssh/src/ssh_acceptor.erl b/lib/ssh/src/ssh_acceptor.erl
index d94dedf..90fd951 100644
--- a/lib/ssh/src/ssh_acceptor.erl
+++ b/lib/ssh/src/ssh_acceptor.erl
@@ -26,7 +26,8 @@
 
 %% Internal application API
 -export([start_link/5,
-	 number_of_connections/1]).
+	 number_of_connections/1,
+	 callback_listen/3]).
 
 %% spawn export 
 -export([acceptor_init/6, acceptor_loop/6]).
@@ -46,15 +47,39 @@ start_link(Port, Address, SockOpts, Opts, AcceptTimeout) ->
 acceptor_init(Parent, Port, Address, SockOpts, Opts, AcceptTimeout) ->
 {_, Callback, _} = 
 	proplists:get_value(transport, Opts, {tcp, gen_tcp, tcp_closed}),
- case (catch do_socket_listen(Callback, Port, [{active, false} | SockOpts])) of
-	{ok, ListenSocket} ->
+
+ SockOwner = proplists:get_value(lsock_owner, Opts),
+ LSock = proplists:get_value(lsocket, Opts),
+ UseExistingSocket =
+	case catch inet:sockname(LSock) of
+	 {ok,{_,Port}} -> is_pid(SockOwner);
+	 _ -> false
+	end,
+
+ case UseExistingSocket of
+	true ->
 	 proc_lib:init_ack(Parent, {ok, self()}),
-	 acceptor_loop(Callback, 
-			 Port, Address, Opts, ListenSocket, AcceptTimeout);
-	Error ->
-	 proc_lib:init_ack(Parent, Error),
-	 error
+	 request_ownership(LSock, SockOwner),
+	 acceptor_loop(Callback, Port, Address, Opts, LSock, AcceptTimeout);
+
+	false -> 
+	 case (catch do_socket_listen(Callback, Port, SockOpts)) of
+		{ok, ListenSocket} ->
+		 proc_lib:init_ack(Parent, {ok, self()}),
+		 acceptor_loop(Callback, 
+				 Port, Address, Opts, ListenSocket, AcceptTimeout);
+		Error ->
+		 proc_lib:init_ack(Parent, Error),
+		 error
+	 end
 end.
+
+request_ownership(LSock, SockOwner) ->
+ SockOwner ! {request_control,LSock,self()},
+ receive
+	{its_yours,LSock} -> ok
+ end.
+ 
 
 do_socket_listen(Callback, Port0, Opts) ->
 Port =
@@ -62,6 +87,10 @@ do_socket_listen(Callback, Port0, Opts) ->
 	 undefined -> Port0;
 	 _ -> 0
 	end,
+ callback_listen(Callback, Port, Opts).
+
+callback_listen(Callback, Port, Opts0) ->
+ Opts = [{active, false}, {reuseaddr,true} | Opts0],
 case Callback:listen(Port, Opts) of
 	{error, nxdomain} ->
 	 Callback:listen(Port, lists:delete(inet6, Opts));
diff --git a/lib/ssh/src/ssh_acceptor_sup.erl b/lib/ssh/src/ssh_acceptor_sup.erl
index b2f489a..4f76dbe 100644
--- a/lib/ssh/src/ssh_acceptor_sup.erl
+++ b/lib/ssh/src/ssh_acceptor_sup.erl
@@ -85,10 +85,7 @@ child_spec(ServerOpts) ->
 Profile = proplists:get_value(profile, proplists:get_value(ssh_opts, ServerOpts), ?DEFAULT_PROFILE),
 Name = id(Address, Port, Profile),
 SocketOpts = proplists:get_value(socket_opts, ServerOpts),
- StartFunc = {ssh_acceptor, start_link, [Port, Address, 
-					 [{active, false},
-					 {reuseaddr, true}] ++ SocketOpts, 
-					 ServerOpts, Timeout]},
+ StartFunc = {ssh_acceptor, start_link, [Port, Address, SocketOpts, ServerOpts, Timeout]},
 Restart = transient, 
 Shutdown = brutal_kill,
 Modules = [ssh_acceptor],
diff --git a/lib/ssh/src/ssh_system_sup.erl b/lib/ssh/src/ssh_system_sup.erl
index 6314671..9a9786a 100644
--- a/lib/ssh/src/ssh_system_sup.erl
+++ b/lib/ssh/src/ssh_system_sup.erl
@@ -192,6 +192,9 @@ stop_acceptor(Sup) ->
 [{Name, AcceptorSup}] =
 	[{SupName, ASup} || {SupName, ASup, _, [ssh_acceptor_sup]} <- 
 			 supervisor:which_children(Sup)],
- supervisor:terminate_child(AcceptorSup, Name).
-
-
+ case supervisor:terminate_child(AcceptorSup, Name) of
+ ok ->
+ supervisor:delete_child(AcceptorSup, Name);
+ Error ->
+ Error
+ end.
-- 
2.1.4

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File 2201-ssh-make-ssh-daemon-choose-port-when-Port-0-in-the-a.patch of Package erlang (Revision 20341d3ca8beab07b502d76ce8eb2b1a)

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