107 lines
3.3 KiB
Python
Executable file
107 lines
3.3 KiB
Python
Executable file
#!/usr/bin/python
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# Copyright (c)2013 the Boeing Company.
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# See the LICENSE file included in this distribution.
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# This script creates a CORE session, that will connect n nodes together
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# in a chain, with static routes between nodes
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# number of nodes / number of hops
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# 2 0
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# 3 1
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# 4 2
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# n n - 2
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#
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# Use core-cleanup to clean up after this script as the session is left running.
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#
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import datetime
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import optparse
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import sys
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from core import constants
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from core.misc import ipaddress, nodeutils, nodemaps
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from core.netns import nodes
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# node list (count from 1)
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from core.session import Session
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n = [None]
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def main():
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usagestr = "usage: %prog [-h] [options] [args]"
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parser = optparse.OptionParser(usage=usagestr)
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parser.set_defaults(numnodes=5)
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parser.add_option("-n", "--numnodes", dest="numnodes", type=int,
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help="number of nodes")
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def usage(msg=None, err=0):
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sys.stdout.write("\n")
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if msg:
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sys.stdout.write(msg + "\n\n")
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parser.print_help()
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sys.exit(err)
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# parse command line options
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(options, args) = parser.parse_args()
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if options.numnodes < 1:
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usage("invalid number of nodes: %s" % options.numnodes)
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if options.numnodes >= 255:
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usage("invalid number of nodes: %s" % options.numnodes)
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for a in args:
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sys.stderr.write("ignoring command line argument: '%s'\n" % a)
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start = datetime.datetime.now()
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session = Session(1, persistent=True)
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if 'server' in globals():
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server.addsession(session)
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print "creating %d nodes" % options.numnodes
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left = None
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prefix = None
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for i in xrange(1, options.numnodes + 1):
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tmp = session.add_object(cls=nodes.CoreNode, name="n%d" % i, objid=i)
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if left:
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tmp.newnetif(left, ["%s/%s" % (prefix.addr(2), prefix.prefixlen)])
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# limit: i < 255
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prefix = ipaddress.Ipv4Prefix("10.83.%d.0/24" % i)
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right = session.add_object(cls=nodes.PtpNet)
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tmp.newnetif(right, ["%s/%s" % (prefix.addr(1), prefix.prefixlen)])
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tmp.cmd([constants.SYSCTL_BIN, "net.ipv4.icmp_echo_ignore_broadcasts=0"])
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tmp.cmd([constants.SYSCTL_BIN, "net.ipv4.conf.all.forwarding=1"])
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tmp.cmd([constants.SYSCTL_BIN, "net.ipv4.conf.default.rp_filter=0"])
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tmp.setposition(x=100 * i, y=150)
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n.append(tmp)
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left = right
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prefixes = map(lambda (x): ipaddress.Ipv4Prefix("10.83.%d.0/24" % x),
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xrange(1, options.numnodes + 1))
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# set up static routing in the chain
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for i in xrange(1, options.numnodes + 1):
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for j in xrange(1, options.numnodes + 1):
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if j < i - 1:
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gw = prefixes[i - 2].addr(1)
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elif j > i:
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if i > len(prefixes) - 1:
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continue
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gw = prefixes[i - 1].addr(2)
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else:
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continue
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net = prefixes[j - 1]
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n[i].cmd([constants.IP_BIN, "route", "add", str(net), "via", str(gw)])
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print "elapsed time: %s" % (datetime.datetime.now() - start)
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if __name__ == "__main__" or __name__ == "__builtin__":
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# configure nodes to use
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node_map = nodemaps.CLASSIC_NODES
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nodeutils.set_node_map(node_map)
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main()
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