mirror of
https://github.com/savoirfairelinux/opendht.git
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106 lines
3.8 KiB
Python
Executable File
106 lines
3.8 KiB
Python
Executable File
#!/usr/bin/env python3
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# Copyright (C) 2015 Savoir-Faire Linux Inc.
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# Author: Adrien Béraud <adrien.beraud@savoirfairelinux.com>
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import argparse, subprocess
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from pyroute2 import IPDB, NetNS
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from pyroute2.netns.process.proxy import NSPopen
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parser = argparse.ArgumentParser(description='Create a dummy network interface for testing')
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parser.add_argument('-i', '--ifname', help='interface name', default='ethdht')
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parser.add_argument('-n', '--ifnum', type=int, help='interface number', default=1)
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parser.add_argument('-r', '--remove', help='remove instead of adding the interface', action="store_true")
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parser.add_argument('-l', '--loss', help='simulated packet loss (percent)', type=int, default=0)
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parser.add_argument('-d', '--delay', help='simulated latency (ms)', type=int, default=0)
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parser.add_argument('-4', '--ipv4', help='Enable IPv4', action="store_true")
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parser.add_argument('-6', '--ipv6', help='Enable IPv6', action="store_true")
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args = parser.parse_args()
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local_addr4 = '10.0.42.'
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local_addr6 = '2001:db9::'
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brige_name = 'br'+args.ifname
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ip = None
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try:
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ip = IPDB()
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if args.remove:
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for ifn in range(args.ifnum):
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iface = args.ifname+str(ifn)
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if iface in ip.interfaces:
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with ip.interfaces[iface] as i:
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i.remove()
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if 'tap'+args.ifname in ip.interfaces:
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with ip.interfaces['tap'+args.ifname] as i:
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i.remove()
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if brige_name in ip.interfaces:
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with ip.interfaces[brige_name] as i:
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i.remove()
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for ifn in range(args.ifnum):
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netns = NetNS('node'+str(ifn))
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netns.close()
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netns.remove()
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else:
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for ifn in range(args.ifnum):
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iface = args.ifname+str(ifn)
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if not iface in ip.interfaces:
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ip.create(kind='veth', ifname=iface, peer=iface+'.1').commit()
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ip.create(kind='tuntap', ifname='tap'+args.ifname, mode='tap').commit()
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with ip.create(kind='bridge', ifname=brige_name) as i:
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for ifn in range(args.ifnum):
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iface = args.ifname+str(ifn)
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i.add_port(ip.interfaces[iface])
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i.add_port(ip.interfaces['tap'+args.ifname])
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if args.ipv4:
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i.add_ip(local_addr4+'1/24')
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if args.ipv6:
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i.add_ip(local_addr6+'1/24')
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i.up()
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with ip.interfaces['tap'+args.ifname] as tap:
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tap.up()
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for ifn in range(args.ifnum):
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iface = args.ifname+str(ifn)
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nns = NetNS('node'+str(ifn))
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iface1 = iface+'.1'
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with ip.interfaces[iface1] as i:
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i.net_ns_fd = nns.netns
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with ip.interfaces[iface] as i:
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i.up()
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ip_ns = IPDB(nl=nns)
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try:
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with ip_ns.interfaces.lo as lo:
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lo.up()
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with ip_ns.interfaces[iface1] as i:
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if args.ipv4:
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i.add_ip(local_addr4+str(ifn+8)+'/24')
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if args.ipv6:
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i.add_ip(local_addr6+str(ifn+8)+'/64')
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i.up()
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finally:
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ip_ns.release()
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nsp = NSPopen(nns.netns, ["tc", "qdisc", "add", "dev", iface1, "root", "netem", "delay", str(args.delay)+"ms", str(int(args.delay/2))+"ms", "loss", str(args.loss)+"%", "25%"], stdout=subprocess.PIPE)
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#print(nsp.communicate()[0].decode())
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nsp.communicate()
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nsp.wait()
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nsp.release()
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if args.ipv4:
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subprocess.call(["sysctl", "-w", "net.ipv4.conf."+brige_name+".forwarding=1"])
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if args.ipv6:
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subprocess.call(["sysctl", "-w", "net.ipv6.conf."+brige_name+".forwarding=1"])
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except Exception as e:
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print('Error',e)
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finally:
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if ip:
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ip.release()
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