initial import (Boeing r1752, NRL r878)

daemon/examples/netns/switch.py

@@ -0,0 +1,78 @@
+#!/usr/bin/python -i
+
+# Copyright (c)2010-2013 the Boeing Company.
+# See the LICENSE file included in this distribution.
+
+# connect n nodes to a virtual switch/hub
+
+import sys, datetime, optparse
+
+from core import pycore
+from core.misc import ipaddr
+from core.constants import *
+
+# node list (count from 1)
+n = [None]
+
+def add_to_server(session):
+    ''' Add this session to the server's list if this script is executed from
+    the core-daemon server.
+    '''
+    global server
+    try:
+        server.addsession(session)
+        return True
+    except NameError:
+        return False
+
+def main():
+    usagestr = "usage: %prog [-h] [options] [args]"
+    parser = optparse.OptionParser(usage = usagestr)
+    parser.set_defaults(numnodes = 5)
+
+    parser.add_option("-n", "--numnodes", dest = "numnodes", type = int,
+                      help = "number of nodes")
+
+    def usage(msg = None, err = 0):
+        sys.stdout.write("\n")
+        if msg:
+            sys.stdout.write(msg + "\n\n")
+        parser.print_help()
+        sys.exit(err)
+
+    # parse command line options
+    (options, args) = parser.parse_args()
+
+    if options.numnodes < 1:
+        usage("invalid number of nodes: %s" % options.numnodes)
+
+    for a in args:
+        sys.stderr.write("ignoring command line argument: '%s'\n" % a)
+
+    start = datetime.datetime.now()
+
+    # IP subnet
+    prefix = ipaddr.IPv4Prefix("10.83.0.0/16")
+    session = pycore.Session(persistent=True)
+    add_to_server(session)
+    # emulated Ethernet switch
+    switch = session.addobj(cls = pycore.nodes.SwitchNode, name = "switch")
+    switch.setposition(x=80,y=50)
+    print "creating %d nodes with addresses from %s" % \
+          (options.numnodes, prefix)
+    for i in xrange(1, options.numnodes + 1):
+        tmp = session.addobj(cls = pycore.nodes.CoreNode, name = "n%d" % i,
+                             objid=i)
+        tmp.newnetif(switch, ["%s/%s" % (prefix.addr(i), prefix.prefixlen)])
+        tmp.cmd([SYSCTL_BIN, "net.ipv4.icmp_echo_ignore_broadcasts=0"])
+        tmp.setposition(x=150*i,y=150)
+        n.append(tmp)
+
+    # start a shell on node 1
+    n[1].term("bash")
+
+    print "elapsed time: %s" % (datetime.datetime.now() - start)
+
+if __name__ == "__main__" or __name__ == "__builtin__":
+    main()
+