From ccca871ae65fee89b150fdff3ebad66677e93469 Mon Sep 17 00:00:00 2001
From: Brandon Heller <brandonh@stanford.edu>
Date: Wed, 18 Aug 2010 00:18:09 -0700
Subject: [PATCH] Add passive listening port

---
 bin/mn          |  6 +++++-
 mininet/net.py  | 19 +++++++++++++------
 mininet/node.py |  5 ++++-
 3 files changed, 22 insertions(+), 8 deletions(-)

diff --git a/bin/mn b/bin/mn
index 9e50cbf..510af1a 100755
--- a/bin/mn
+++ b/bin/mn
@@ -176,6 +176,9 @@ class MininetRunner( object ):
                         ' controller]' )
         opts.add_option( '--innamespace', action='store_true',
                         default=False, help='sw and ctrl in namespace?' )
+        opts.add_option( '--listenport', type='int', default=6634,
+                        help='[base port for passive switch listening'
+                        ' controller]' )
         opts.add_option( '--pre', type='string', default=None,
                         help='[CLI script to run before tests]' )
         opts.add_option( '--post', type='string', default=None,
@@ -222,10 +225,11 @@ class MininetRunner( object ):
         xterms = self.options.xterms
         mac = self.options.mac
         arp = self.options.arp
+        listenPort = self.options.listenport
         mn = Mininet( topo, switch, host, controller, controllerParams,
                      inNamespace=inNamespace,
                      xterms=xterms, autoSetMacs=mac,
-                     autoStaticArp=arp )
+                     autoStaticArp=arp, listenPort=listenPort )
         if self.options.pre:
             CLI( mn, script=self.options.pre )
 
diff --git a/mininet/net.py b/mininet/net.py
index 5f1bb44..d343207 100755
--- a/mininet/net.py
+++ b/mininet/net.py
@@ -108,7 +108,7 @@ class Mininet( object ):
                  cparams=ControllerParams( '10.0.0.0', 8 ),
                  build=True, xterms=False, cleanup=False,
                  inNamespace=False,
-                 autoSetMacs=False, autoStaticArp=False ):
+                 autoSetMacs=False, autoStaticArp=False, listenPort=None ):
         """Create Mininet object.
            topo: Topo (topology) object or None
            switch: Switch class
@@ -120,7 +120,9 @@ class Mininet( object ):
            cleanup: if build now, cleanup before creating?
            inNamespace: spawn switches and controller in net namespaces?
            autoSetMacs: set MAC addrs from topo?
-           autoStaticArp: set all-pairs static MAC addrs?"""
+           autoStaticArp: set all-pairs static MAC addrs?
+           listenPort: base listening port to open; will be incremented for
+               each additional switch in the net if inNamespace=False"""
         self.switch = switch
         self.host = host
         self.controller = controller
@@ -131,6 +133,7 @@ class Mininet( object ):
         self.cleanup = cleanup
         self.autoSetMacs = autoSetMacs
         self.autoStaticArp = autoStaticArp
+        self.listenPort = listenPort
 
         self.hosts = []
         self.switches = []
@@ -162,13 +165,17 @@ class Mininet( object ):
         """Add switch.
            name: name of switch to add
            mac: default MAC address for kernel/OVS switch intf 0
-           returns: added switch"""
+           returns: added switch
+           side effect: increments the listenPort member variable."""
         if self.switch == UserSwitch:
-            sw = self.switch( name, defaultMAC=mac, defaultIP=ip,
-                inNamespace=self.inNamespace )
+            sw = self.switch( name, listenPort=self.listenPort,
+                defaultMAC=mac, defaultIP=ip, inNamespace=self.inNamespace )
         else:
-            sw = self.switch( name, defaultMAC=mac, defaultIP=ip, dp=self.dps,
+            sw = self.switch( name, listenPort=self.listenPort,
+                defaultMAC=mac, defaultIP=ip, dp=self.dps,
                 inNamespace=self.inNamespace )
+        if not self.inNamespace:
+            self.listenPort += 1
         self.dps += 1
         self.switches.append( sw )
         self.nameToNode[ name ] = sw
diff --git a/mininet/node.py b/mininet/node.py
index 6380fee..6da4d70 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -434,9 +434,12 @@ class Switch( Node ):
 
     portBase = SWITCH_PORT_BASE  # 0 for OF < 1.0, 1 for OF >= 1.0
 
-    def __init__( self, name, opts='', **kwargs):
+    def __init__( self, name, opts='', listenPort=None, **kwargs):
         Node.__init__( self, name, **kwargs )
         self.opts = opts
+        self.listenPort = listenPort
+        if self.listenPort:
+            self.opts += ' --listen=ptcp:%i ' % self.listenPort
 
     def sendCmd( self, *cmd, **kwargs ):
         """Send command to Node.