From 1bb8e4ae6eaf2f18d3b2ccc8e77cd7228e1c6e8a Mon Sep 17 00:00:00 2001
From: Hans Nilsson <hans@erlang.org>
Date: Thu, 14 Jan 2016 10:39:17 +0100
Subject: ssh: Experimental options for ssh_sftp:start_channel to set
 packet_size or window_size

---
 lib/ssh/src/ssh_sftp.erl | 28 ++++++++++++++++------------
 lib/ssh/src/ssh_xfer.erl | 22 ++++++++++++++++------
 2 files changed, 32 insertions(+), 18 deletions(-)

(limited to 'lib/ssh/src')

diff --git a/lib/ssh/src/ssh_sftp.erl b/lib/ssh/src/ssh_sftp.erl
index dbacf730cc..eb99406626 100644
--- a/lib/ssh/src/ssh_sftp.erl
+++ b/lib/ssh/src/ssh_sftp.erl
@@ -99,8 +99,8 @@ start_channel(Host) when is_list(Host) ->
     start_channel(Host, []).					 
 start_channel(Cm, Opts) when is_pid(Cm) ->
     Timeout = proplists:get_value(timeout, Opts, infinity),
-    {_, SftpOpts} = handle_options(Opts, [], []),
-    case ssh_xfer:attach(Cm, []) of
+    {_, ChanOpts, SftpOpts} = handle_options(Opts, [], [], []),
+    case ssh_xfer:attach(Cm, [], ChanOpts) of
 	{ok, ChannelId, Cm} -> 
 	    case ssh_channel:start(Cm, ChannelId, 
 				   ?MODULE, [Cm, ChannelId, SftpOpts]) of
@@ -123,9 +123,9 @@ start_channel(Cm, Opts) when is_pid(Cm) ->
 start_channel(Host, Opts) ->
     start_channel(Host, 22, Opts).
 start_channel(Host, Port, Opts) ->
-    {SshOpts, SftpOpts} = handle_options(Opts, [], []),
+    {SshOpts, ChanOpts, SftpOpts} = handle_options(Opts, [], [], []),
     Timeout = proplists:get_value(timeout, SftpOpts, infinity),
-    case ssh_xfer:connect(Host, Port, SshOpts, Timeout) of
+    case ssh_xfer:connect(Host, Port, SshOpts, ChanOpts, Timeout) of
 	{ok, ChannelId, Cm} ->
 	    case ssh_channel:start(Cm, ChannelId, ?MODULE, [Cm, 
 							    ChannelId, SftpOpts]) of
@@ -842,14 +842,18 @@ terminate(_Reason, State) ->
 %%====================================================================
 %% Internal functions
 %%====================================================================
-handle_options([], Sftp, Ssh) ->
-    {Ssh, Sftp};
-handle_options([{timeout, _} = Opt | Rest], Sftp, Ssh) ->
-    handle_options(Rest, [Opt | Sftp], Ssh);
-handle_options([{sftp_vsn, _} = Opt| Rest], Sftp, Ssh) ->
-    handle_options(Rest, [Opt | Sftp], Ssh);
-handle_options([Opt | Rest], Sftp, Ssh) ->
-    handle_options(Rest, Sftp, [Opt | Ssh]).
+handle_options([], Sftp, Chan, Ssh) ->
+    {Ssh, Chan, Sftp};
+handle_options([{timeout, _} = Opt | Rest], Sftp, Chan, Ssh) ->
+    handle_options(Rest, [Opt|Sftp], Chan, Ssh);
+handle_options([{sftp_vsn, _} = Opt| Rest], Sftp, Chan, Ssh) ->
+    handle_options(Rest, [Opt|Sftp], Chan, Ssh);
+handle_options([{window_size, _} = Opt| Rest], Sftp, Chan, Ssh) ->
+    handle_options(Rest, Sftp, [Opt|Chan], Ssh);
+handle_options([{packet_size, _} = Opt| Rest], Sftp, Chan, Ssh) ->
+    handle_options(Rest, Sftp, [Opt|Chan], Ssh);
+handle_options([Opt|Rest], Sftp, Chan, Ssh) ->
+    handle_options(Rest, Sftp, Chan, [Opt|Ssh]).
 
 call(Pid, Msg, TimeOut) ->
     ssh_channel:call(Pid, {{timeout, TimeOut}, Msg}, infinity).
diff --git a/lib/ssh/src/ssh_xfer.erl b/lib/ssh/src/ssh_xfer.erl
index b8dff1c533..e7dd8e7098 100644
--- a/lib/ssh/src/ssh_xfer.erl
+++ b/lib/ssh/src/ssh_xfer.erl
@@ -24,7 +24,7 @@
 
 -module(ssh_xfer).
 
--export([attach/2, connect/3, connect/4]).
+-export([attach/2, attach/3, connect/3, connect/4, connect/5]).
 -export([open/6, opendir/3, readdir/3, close/3, read/5, write/5,
 	 rename/5, remove/3, mkdir/4, rmdir/3, realpath/3, extended/4,
 	 stat/4, fstat/4, lstat/4, setstat/4,
@@ -51,24 +51,34 @@
 -define(XFER_WINDOW_SIZE, 4*?XFER_PACKET_SIZE).
 
 attach(CM, Opts) ->
-    open_xfer(CM, Opts).
+    open_xfer(CM, Opts, []).
+
+attach(CM, Opts, ChanOpts) ->
+    open_xfer(CM, Opts, ChanOpts).
+
 
 connect(Host, Port, Opts) ->
     case ssh:connect(Host, Port, Opts) of
-	{ok, CM} -> open_xfer(CM, Opts);
+	{ok, CM} -> open_xfer(CM, Opts, []);
 	Error -> Error
     end.
 
 connect(Host, Port, Opts, Timeout) ->
+    connect(Host, Port, Opts, [], Timeout).
+
+connect(Host, Port, Opts, ChanOpts, Timeout) ->
     case ssh:connect(Host, Port, Opts, Timeout) of
-	{ok, CM} -> open_xfer(CM, [{timeout, Timeout}|Opts]);
+	{ok, CM} -> open_xfer(CM, [{timeout, Timeout}|Opts], ChanOpts);
 	{error, Timeout} -> {error, timeout};
 	Error -> Error
     end.
 
-open_xfer(CM, Opts) ->
+
+open_xfer(CM, Opts, ChanOpts) ->
     TMO = proplists:get_value(timeout, Opts, infinity),
-    case ssh_connection:session_channel(CM, ?XFER_WINDOW_SIZE, ?XFER_PACKET_SIZE, TMO) of
+    WindowSize = proplists:get_value(window_size, ChanOpts,  ?XFER_WINDOW_SIZE),
+    PacketSize = proplists:get_value(packet_size, ChanOpts,  ?XFER_PACKET_SIZE),
+    case ssh_connection:session_channel(CM, WindowSize, PacketSize, TMO) of
 	{ok, ChannelId} ->
 	    {ok, ChannelId, CM};
 	Error -> 
-- 
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