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import subprocess
import os
_netns = ["ip", "netns"]
def run_netns(*cmd):
process = subprocess.run(_netns + list(cmd), stdout=subprocess.PIPE, stderr=subprocess.PIPE, text=True)
if process.returncode != 0:
raise Exception(f"Failed to run command {cmd}:" + process.stderr)
return process
class ns:
def name_unconfined():
if "unconfined" not in ns.list(True):
run_netns("attach", "unconfined", str(os.getpid()))
def list(include_unconfined = False):
try:
nss = os.listdir("/var/run/netns")
return [ns for ns in nss if ns.startswith("testnet-") or include_unconfined and ns == "unconfined"]
except FileNotFoundError:
return []
def forget(name):
run_netns("del", name)
def kill(name):
pids = run_netns("pids", name).stdout.split("\n")
pids = [pid for pid in pids if pid]
if pids:
process = subprocess.run(["sudo", "kill", "-9"] + pids)
if process.returncode != 0:
raise Exception("Failed to list namespaces: " + process.stderr)
ns.forget(name)
def create(name):
run_netns("add", name)
run_netns("exec", name, "ip", "link", "set", "dev", "lo", "up")
def run(name, cmd, env=None):
return subprocess.Popen(_netns + ["exec", name] + cmd, env=env)
def create_bridge(name, namespace, ports=[]):
run_netns("exec", namespace, "ip", "link", "add", "name", name, "type", "bridge")
run_netns("exec", namespace, "ip", "link", "set", "dev", name, "up")
for port in ports:
run_netns("exec", namespace, "ip", "link", "set", "dev", port, "master", name)
pass
def create_veth(name1, ns1, name2, ns2, ip = None, subnet=0, link=None):
run_netns("exec", ns1, "ip", "link", "add", "name", name1, "type", "veth",
"peer", "name", name2, "netns", ns2)
if ip:
ip = f"{ip}/{subnet}"
run_netns("exec", ns1, "ip", "addr", "add", "dev", name1, ip)
run_netns("exec", ns1, "ip", "link", "set", "dev", name1, "up")
run_netns("exec", ns2, "ip", "link", "set", "dev", name2, "up")
if link:
if link.txqueuelen:
run_netns("exec", ns1, "ip", "link", "set", "dev", name1, "txqueuelen", str(link.txqueuelen))
run_netns("exec", ns2, "ip", "link", "set", "dev", name2, "txqueuelen", str(link.txqueuelen))
tc(ns1, name1, link)
tc(ns2, name2, link, True)
def tc(namespace, name, link, invert=False):
options = []
if invert:
options += ["delay", str(link.latency.latency_us), str(link.jitter.latency_us)]
options += ["rate", str(link.bandwidth.down)]
else:
options += ["rate", str(link.bandwidth.up)]
if link.limit:
options += ["limit", str(link.limit)]
run_netns("exec", namespace, "tc", "qdisc", "add", "dev", name, "root", "netem", *options)
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