From 91b9e374a0fb5131664abdcc4d2ad667506827f5 Mon Sep 17 00:00:00 2001
From: Bob Lantz <rlantz@cs.stanford.edu>
Date: Fri, 5 Mar 2010 17:13:44 -0800
Subject: [PATCH] Revived sshd.py example.
---
examples/sshd.py | 66 +++++++++++++++++++++++++++++-------------------
1 file changed, 40 insertions(+), 26 deletions(-)
diff --git a/examples/sshd.py b/examples/sshd.py
index 27c7f703..298994b6 100755
--- a/examples/sshd.py
+++ b/examples/sshd.py
@@ -8,50 +8,64 @@
the advantage of running sshd is that scripts can work
unchanged on mininet and hardware.
+In addition to providing ssh access to hosts, this example
+demonstrates:
+
+- creating a convenience function to construct networks
+- connecting the host network to the root namespace
+- running server processes (sshd in this case) on hosts
"""
-import sys ; readline = sys.stdin.readline
-from mininet.mininet import init, Node, createLink, TreeNet, Cli
+from mininet.net import init, Mininet
+from mininet.cli import CLI
+from mininet.log import lg
+from mininet.node import Node, KernelSwitch
+from mininet.topolib import TreeTopo
+from mininet.util import createLink
-def nets( hosts ):
- "Return list of networks (/24) for hosts."
- nets = {}
- for host in hosts:
- net = host.IP().split( '.' )[ : -1 ]
- net = '.'.join( net ) + '.0/24'
- nets[ net ] = True
- return nets.keys()
+def TreeNet( depth=1, fanout=2, **kwargs ):
+ "Convenience function for creating tree networks."
+ topo = TreeTopo( depth, fanout )
+ return Mininet( topo, **kwargs )
-def connectToRootNS( network, switch ):
- "Connect hosts to root namespace via switch. Starts network."
+def connectToRootNS( network, switch, ip, prefixLen, routes ):
+ """Connect hosts to root namespace via switch. Starts network.
+ network: Mininet() network object
+ switch: switch to connect to root namespace
+ ip: IP address for root namespace node
+ prefixLen: IP address prefix length (e.g. 8, 16, 24)
+ routes: host networks to route to"""
# Create a node in root namespace and link to switch 0
root = Node( 'root', inNamespace=False )
- createLink( root, switch )
- ip = '10.0.123.1'
- root.setIP( root.intfs[ 0 ], ip, '/24' )
+ port = max( switch.ports.values() ) + 1
+ createLink( root, 0, switch, port )
+ root.setIP( root.intfs[ 0 ], ip, prefixLen )
# Start network that now includes link to root namespace
network.start()
- # Add routes
- routes = nets( network.hosts )
intf = root.intfs[ 0 ]
+ # Add routes from root ns to hosts
for net in routes:
- root.cmdPrint( 'route add -net ' + net + ' dev ' + intf )
+ root.cmd( 'route add -net ' + net + ' dev ' + intf )
-def sshd( network ):
+def sshd( network, cmd='/usr/sbin/sshd -D' ):
"Start a network, connect it to root ns, and run sshd on all hosts."
- connectToRootNS( network, network.switches[ 0 ] )
- for host in network.hosts: host.cmd( 'sshd -D &' )
+ switch = network.switches[ 0 ] # switch to use
+ ip = '10.123.123.1' # our IP address on host network
+ routes = [ '10.0.0.0/8' ] # host networks to route to
+ connectToRootNS( network, switch, ip, 8, routes )
+ for host in network.hosts: host.cmd( cmd + ' &' )
print
print "*** Hosts are running sshd at the following addresses:"
print
for host in network.hosts: print host.name, host.IP()
print
- print "*** Press return to shut down network: ",
- readline()
- for host in network.hosts: host.cmd( 'kill %sshd')
+ print "*** Type 'exit' or control-D to shut down network"
+ CLI( network )
+ for host in network.hosts: host.cmd( 'kill %' + cmd )
network.stop()
if __name__ == '__main__':
+ lg.setLogLevel( 'info')
init()
- network = TreeNet( depth=1, fanout=4, kernel=True )
- sshd( network )
\ No newline at end of file
+ network = TreeNet( depth=1, fanout=4, switch=KernelSwitch )
+ sshd( network )
--
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