From eb1f1e4465bc3358e63d6b9ce05da22ba158492a Mon Sep 17 00:00:00 2001
From: Jamis Buck <jamis@37signals.com>
Date: Sat, 31 Jan 2009 21:37:28 -0700
Subject: Allow local port to be specified to Gateway#open

---
 CHANGELOG.rdoc         |  4 ++++
 lib/net/ssh/gateway.rb | 21 +++++++++++++--------
 test/gateway_test.rb   |  8 +++++++-
 3 files changed, 24 insertions(+), 9 deletions(-)

diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index 4bf62fb..c8d37b2 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -1,3 +1,7 @@
+=== (unreleased)
+
+* Allow local port to be specified [Will Klancnik]
+
 === 1.0.0 / 1 May 2008
 
 * (no changes since the preview release)
diff --git a/lib/net/ssh/gateway.rb b/lib/net/ssh/gateway.rb
index 897291f..9742db9 100644
--- a/lib/net/ssh/gateway.rb
+++ b/lib/net/ssh/gateway.rb
@@ -111,25 +111,28 @@ class Net::SSH::Gateway
   #   port = gateway.open('host', 80)
   #   # ...
   #   gateway.close(port)
-  def open(host, port)
+  #
+  # If +local_port+ is not specified, the next available port will be used.
+  def open(host, port, local_port=nil)
     ensure_open!
 
-    local_port = next_port
+    actual_local_port = local_port || next_port
 
     @session_mutex.synchronize do
-      @session.forward.local(local_port, host, port)
+      @session.forward.local(actual_local_port, host, port)
     end
 
     if block_given?
       begin
-        yield local_port
+        yield actual_local_port
       ensure
-        close(local_port)
+        close(actual_local_port)
       end
     else
-      return local_port
+      return actual_local_port
     end
   rescue Errno::EADDRINUSE
+    raise if local_port # if a local port was explicitly requested, bubble the error up
     retry
   end
 
@@ -186,7 +189,9 @@ class Net::SSH::Gateway
 
       @thread = Thread.new do
         while @active
-          @session_mutex.synchronize { @session.process(0.1) }
+          @session_mutex.synchronize do
+            @session.process(0.1)
+          end
         end
       end
     end
@@ -200,4 +205,4 @@ class Net::SSH::Gateway
         port
       end
     end
-end
\ No newline at end of file
+end
diff --git a/test/gateway_test.rb b/test/gateway_test.rb
index 6194886..8d7fac7 100644
--- a/test/gateway_test.rb
+++ b/test/gateway_test.rb
@@ -27,6 +27,12 @@ class GatewayTest < Test::Unit::TestCase
     assert_equal [65000, "app1", 22], gateway_session.forward.active_locals[65000]
   end
 
+  def test_open_with_explicit_local_port_should_use_that_port
+    gateway_session, gateway = new_gateway
+    assert_equal 8181, gateway.open("app1", 22, 8181)
+    assert_equal [8181, "app1", 22], gateway_session.forward.active_locals[8181]
+  end
+
   def test_ssh_should_return_connection_when_no_block_is_given
     gateway_session, gateway = new_gateway
     expect_connect_to("127.0.0.1", "user", :port => 65535).returns(result = mock("session"))
@@ -113,4 +119,4 @@ class GatewayTest < Test::Unit::TestCase
         @looping = false
       end
     end
-end
\ No newline at end of file
+end
-- 
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