550 lines
18 KiB
Python
550 lines
18 KiB
Python
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import logging
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import os
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import random
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import shutil
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import string
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import threading
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from core import utils, CoreCommandError, constants
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from core.emulator.enumerations import NodeTypes
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from core.nodes.base import CoreNodeBase
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from core.nodes.interface import Veth, TunTap, CoreInterface
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_DEFAULT_MTU = 1500
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class DockerClient(object):
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def __init__(self, name):
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self.name = name
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self.pid = None
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self._addr = {}
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def create_container(self, image):
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utils.check_cmd("docker run -td --net=none --hostname {name} --name {name} {image} /bin/bash".format(
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name=self.name,
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image=image
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))
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def is_container_alive(self):
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status, output = utils.cmd_output("docker containers ls -f name={name}".format(
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name=self.name
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))
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return not status and len(output.split("\n")) == 2
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def stop_container(self):
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utils.check_cmd("docker rm -f {name}".format(
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name=self.name
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))
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def run_cmd(self, cmd):
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if isinstance(cmd, list):
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cmd = " ".join(cmd)
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return utils.cmd_output("docker exec -it {name} {cmd}".format(
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name=self.name,
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cmd=cmd
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))
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def ns_cmd(self, cmd):
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if isinstance(cmd, list):
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cmd = " ".join(cmd)
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status, output = utils.cmd_output("nsenter -t {pid} -m -u -i -p -n {cmd}".format(
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pid=self.pid,
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cmd=cmd
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))
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if status:
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raise CoreCommandError(status, output)
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return output
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def get_pid(self):
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status, output = utils.cmd_output("docker inspect -f '{{{{.State.Pid}}}}' {name}".format(name=self.name))
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if status:
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raise CoreCommandError(status, output)
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self.pid = output
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logging.debug("node(%s) pid: %s", self.name, self.pid)
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return output
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def getaddr(self, ifname, rescan=False):
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"""
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Get address for interface on node.
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:param str ifname: interface name to get address for
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:param bool rescan: rescan flag
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:return: interface information
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:rtype: dict
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"""
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if ifname in self._addr and not rescan:
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return self._addr[ifname]
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interface = {"ether": [], "inet": [], "inet6": [], "inet6link": []}
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args = ["ip", "addr", "show", "dev", ifname]
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status, output = self.ns_cmd(args)
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for line in output:
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line = line.strip().split()
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if line[0] == "link/ether":
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interface["ether"].append(line[1])
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elif line[0] == "inet":
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interface["inet"].append(line[1])
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elif line[0] == "inet6":
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if line[3] == "global":
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interface["inet6"].append(line[1])
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elif line[3] == "link":
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interface["inet6link"].append(line[1])
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else:
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logging.warning("unknown scope: %s" % line[3])
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if status:
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logging.warning("nonzero exist status (%s) for cmd: %s", status, args)
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self._addr[ifname] = interface
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return interface
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class DockerNode(CoreNodeBase):
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apitype = NodeTypes.DOCKER.value
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valid_address_types = {"inet", "inet6", "inet6link"}
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def __init__(self, session, _id=None, name=None, nodedir=None, bootsh="boot.sh", start=True):
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"""
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Create a CoreNode instance.
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:param core.emulator.session.Session session: core session instance
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:param int _id: object id
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:param str name: object name
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:param str nodedir: node directory
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:param str bootsh: boot shell to use
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:param bool start: start flag
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"""
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super(CoreNodeBase, self).__init__(session, _id, name, start=start)
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self.nodedir = nodedir
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self.ctrlchnlname = os.path.abspath(os.path.join(self.session.session_dir, self.name))
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self.client = DockerClient(self.name)
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self.pid = None
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self.up = False
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self.lock = threading.RLock()
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self._mounts = []
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self.bootsh = bootsh
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if start:
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self.startup()
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def alive(self):
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"""
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Check if the node is alive.
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:return: True if node is alive, False otherwise
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:rtype: bool
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"""
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return self.client.is_container_alive()
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def startup(self):
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"""
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Start a new namespace node by invoking the vnoded process that
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allocates a new namespace. Bring up the loopback device and set
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the hostname.
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:return: nothing
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"""
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with self.lock:
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if self.up:
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raise ValueError("starting a node that is already up")
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self.client.create_container("ubuntu:ifconfig")
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self.pid = self.client.get_pid()
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self.up = True
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def shutdown(self):
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"""
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Shutdown logic.
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:return: nothing
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"""
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# nothing to do if node is not up
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if not self.up:
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return
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with self.lock:
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self._netif.clear()
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self.client.stop_container()
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self.up = False
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def cmd(self, args, wait=True):
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"""
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Runs shell command on node, with option to not wait for a result.
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:param list[str]|str args: command to run
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:param bool wait: wait for command to exit, defaults to True
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:return: exit status for command
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:rtype: int
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"""
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status, _ = self.client.run_cmd(args)
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return status
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def cmd_output(self, args):
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"""
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Runs shell command on node and get exit status and output.
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:param list[str]|str args: command to run
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:return: exit status and combined stdout and stderr
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:rtype: tuple[int, str]
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"""
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return self.client.run_cmd(args)
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def check_cmd(self, args):
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"""
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Runs shell command on node.
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:param list[str]|str args: command to run
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:return: combined stdout and stderr
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:rtype: str
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:raises CoreCommandError: when a non-zero exit status occurs
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"""
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status, output = self.client.run_cmd(args)
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if status:
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raise CoreCommandError(status, output)
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return output
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def termcmdstring(self, sh="/bin/sh"):
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"""
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Create a terminal command string.
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:param str sh: shell to execute command in
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:return: str
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"""
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return ""
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def privatedir(self, path):
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"""
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Create a private directory.
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:param str path: path to create
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:return: nothing
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"""
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pass
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def mount(self, source, target):
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"""
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Create and mount a directory.
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:param str source: source directory to mount
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:param str target: target directory to create
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:return: nothing
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:raises CoreCommandError: when a non-zero exit status occurs
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"""
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pass
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def newifindex(self):
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"""
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Retrieve a new interface index.
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:return: new interface index
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:rtype: int
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"""
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with self.lock:
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return super(DockerNode, self).newifindex()
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def newveth(self, ifindex=None, ifname=None, net=None):
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"""
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Create a new interface.
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:param int ifindex: index for the new interface
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:param str ifname: name for the new interface
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:param core.nodes.base.CoreNetworkBase net: network to associate interface with
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:return: nothing
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"""
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with self.lock:
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if ifindex is None:
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ifindex = self.newifindex()
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if ifname is None:
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ifname = "eth%d" % ifindex
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sessionid = self.session.short_session_id()
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try:
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suffix = "%x.%s.%s" % (self.id, ifindex, sessionid)
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except TypeError:
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suffix = "%s.%s.%s" % (self.id, ifindex, sessionid)
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localname = "veth" + suffix
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if len(localname) >= 16:
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raise ValueError("interface local name (%s) too long" % localname)
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name = localname + "p"
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if len(name) >= 16:
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raise ValueError("interface name (%s) too long" % name)
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veth = Veth(node=self, name=name, localname=localname, net=net, start=self.up)
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if self.up:
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utils.check_cmd([constants.IP_BIN, "link", "set", veth.name, "netns", str(self.pid)])
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self.client.ns_cmd(["ip", "link", "set", veth.name, "name", ifname])
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self.client.ns_cmd(["ethtool", "-K", ifname, "rx", "off", "tx", "off"])
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veth.name = ifname
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if self.up:
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# TODO: potentially find better way to query interface ID
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# retrieve interface information
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output = self.client.ns_cmd([constants.IP_BIN, "link", "show", veth.name])
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logging.debug("interface command output: %s", output)
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output = output.split("\n")
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veth.flow_id = int(output[0].strip().split(":")[0]) + 1
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logging.debug("interface flow index: %s - %s", veth.name, veth.flow_id)
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# TODO: mimic packed hwaddr
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# veth.hwaddr = MacAddress.from_string(output[1].strip().split()[1])
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logging.debug("interface mac: %s - %s", veth.name, veth.hwaddr)
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try:
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self.addnetif(veth, ifindex)
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except ValueError as e:
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veth.shutdown()
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del veth
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raise e
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return ifindex
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def newtuntap(self, ifindex=None, ifname=None, net=None):
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"""
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Create a new tunnel tap.
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:param int ifindex: interface index
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:param str ifname: interface name
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:param net: network to associate with
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:return: interface index
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:rtype: int
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"""
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with self.lock:
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if ifindex is None:
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ifindex = self.newifindex()
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if ifname is None:
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ifname = "eth%d" % ifindex
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sessionid = self.session.short_session_id()
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localname = "tap%s.%s.%s" % (self.id, ifindex, sessionid)
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name = ifname
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tuntap = TunTap(node=self, name=name, localname=localname, net=net, start=self.up)
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try:
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self.addnetif(tuntap, ifindex)
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except ValueError as e:
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tuntap.shutdown()
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del tuntap
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raise e
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return ifindex
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def sethwaddr(self, ifindex, addr):
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"""
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Set hardware addres for an interface.
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:param int ifindex: index of interface to set hardware address for
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:param core.nodes.ipaddress.MacAddress addr: hardware address to set
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:return: nothing
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:raises CoreCommandError: when a non-zero exit status occurs
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"""
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self._netif[ifindex].sethwaddr(addr)
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if self.up:
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args = ["ip", "link", "set", "dev", self.ifname(ifindex), "address", str(addr)]
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self.client.ns_cmd(args)
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def addaddr(self, ifindex, addr):
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"""
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Add interface address.
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:param int ifindex: index of interface to add address to
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:param str addr: address to add to interface
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:return: nothing
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"""
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if self.up:
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# check if addr is ipv6
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if ":" in str(addr):
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args = ["ip", "addr", "add", str(addr), "dev", self.ifname(ifindex)]
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self.client.ns_cmd(args)
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else:
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args = ["ip", "addr", "add", str(addr), "broadcast", "+", "dev", self.ifname(ifindex)]
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self.client.ns_cmd(args)
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self._netif[ifindex].addaddr(addr)
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def deladdr(self, ifindex, addr):
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"""
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Delete address from an interface.
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:param int ifindex: index of interface to delete address from
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:param str addr: address to delete from interface
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:return: nothing
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:raises CoreCommandError: when a non-zero exit status occurs
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"""
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try:
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self._netif[ifindex].deladdr(addr)
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except ValueError:
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logging.exception("trying to delete unknown address: %s" % addr)
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if self.up:
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self.check_cmd(["ip", "addr", "del", str(addr), "dev", self.ifname(ifindex)])
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def delalladdr(self, ifindex, address_types=None):
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"""
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Delete all addresses from an interface.
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:param int ifindex: index of interface to delete address types from
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:param tuple[str] address_types: address types to delete
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||
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|
:return: nothing
|
||
|
|
:raises CoreCommandError: when a non-zero exit status occurs
|
||
|
|
"""
|
||
|
|
if not address_types:
|
||
|
|
address_types = self.valid_address_types
|
||
|
|
|
||
|
|
interface_name = self.ifname(ifindex)
|
||
|
|
addresses = self.client.getaddr(interface_name, rescan=True)
|
||
|
|
|
||
|
|
for address_type in address_types:
|
||
|
|
if address_type not in self.valid_address_types:
|
||
|
|
raise ValueError("addr type must be in: %s" % " ".join(self.valid_address_types))
|
||
|
|
for address in addresses[address_type]:
|
||
|
|
self.deladdr(ifindex, address)
|
||
|
|
|
||
|
|
# update cached information
|
||
|
|
self.client.getaddr(interface_name, rescan=True)
|
||
|
|
|
||
|
|
def ifup(self, ifindex):
|
||
|
|
"""
|
||
|
|
Bring an interface up.
|
||
|
|
|
||
|
|
:param int ifindex: index of interface to bring up
|
||
|
|
:return: nothing
|
||
|
|
"""
|
||
|
|
if self.up:
|
||
|
|
# self.check_cmd(["ip", "link", "set", self.ifname(ifindex), "up"])
|
||
|
|
self.client.ns_cmd(["ip", "link", "set", self.ifname(ifindex), "up"])
|
||
|
|
|
||
|
|
def newnetif(self, net=None, addrlist=None, hwaddr=None, ifindex=None, ifname=None):
|
||
|
|
"""
|
||
|
|
Create a new network interface.
|
||
|
|
|
||
|
|
:param core.nodes.base.CoreNetworkBase net: network to associate with
|
||
|
|
:param list addrlist: addresses to add on the interface
|
||
|
|
:param core.nodes.ipaddress.MacAddress hwaddr: hardware address to set for interface
|
||
|
|
:param int ifindex: index of interface to create
|
||
|
|
:param str ifname: name for interface
|
||
|
|
:return: interface index
|
||
|
|
:rtype: int
|
||
|
|
"""
|
||
|
|
if not addrlist:
|
||
|
|
addrlist = []
|
||
|
|
|
||
|
|
with self.lock:
|
||
|
|
ifindex = self.newveth(ifindex=ifindex, ifname=ifname, net=net)
|
||
|
|
|
||
|
|
if net is not None:
|
||
|
|
self.attachnet(ifindex, net)
|
||
|
|
|
||
|
|
if hwaddr:
|
||
|
|
self.sethwaddr(ifindex, hwaddr)
|
||
|
|
|
||
|
|
for address in utils.make_tuple(addrlist):
|
||
|
|
self.addaddr(ifindex, address)
|
||
|
|
|
||
|
|
self.ifup(ifindex)
|
||
|
|
return ifindex
|
||
|
|
|
||
|
|
def connectnode(self, ifname, othernode, otherifname):
|
||
|
|
"""
|
||
|
|
Connect a node.
|
||
|
|
|
||
|
|
:param str ifname: name of interface to connect
|
||
|
|
:param core.nodes.CoreNodeBase othernode: node to connect to
|
||
|
|
:param str otherifname: interface name to connect to
|
||
|
|
:return: nothing
|
||
|
|
"""
|
||
|
|
tmplen = 8
|
||
|
|
tmp1 = "tmp." + "".join([random.choice(string.ascii_lowercase) for _ in range(tmplen)])
|
||
|
|
tmp2 = "tmp." + "".join([random.choice(string.ascii_lowercase) for _ in range(tmplen)])
|
||
|
|
utils.check_cmd([constants.IP_BIN, "link", "add", "name", tmp1, "type", "veth", "peer", "name", tmp2])
|
||
|
|
|
||
|
|
utils.check_cmd([constants.IP_BIN, "link", "set", tmp1, "netns", str(self.pid)])
|
||
|
|
self.check_cmd(["ip", "link", "set", tmp1, "name", ifname])
|
||
|
|
interface = CoreInterface(node=self, name=ifname, mtu=_DEFAULT_MTU)
|
||
|
|
self.addnetif(interface, self.newifindex())
|
||
|
|
|
||
|
|
utils.check_cmd([constants.IP_BIN, "link", "set", tmp2, "netns", str(othernode.pid)])
|
||
|
|
othernode.check_cmd([constants.IP_BIN, "link", "set", tmp2, "name", otherifname])
|
||
|
|
other_interface = CoreInterface(node=othernode, name=otherifname, mtu=_DEFAULT_MTU)
|
||
|
|
othernode.addnetif(other_interface, othernode.newifindex())
|
||
|
|
|
||
|
|
def addfile(self, srcname, filename):
|
||
|
|
"""
|
||
|
|
Add a file.
|
||
|
|
|
||
|
|
:param str srcname: source file name
|
||
|
|
:param str filename: file name to add
|
||
|
|
:return: nothing
|
||
|
|
:raises CoreCommandError: when a non-zero exit status occurs
|
||
|
|
"""
|
||
|
|
logging.info("adding file from %s to %s", srcname, filename)
|
||
|
|
directory = os.path.dirname(filename)
|
||
|
|
|
||
|
|
cmd = 'mkdir -p "%s" && mv "%s" "%s" && sync' % (directory, srcname, filename)
|
||
|
|
status, output = self.client.run_cmd(cmd)
|
||
|
|
if status:
|
||
|
|
raise CoreCommandError(status, cmd, output)
|
||
|
|
|
||
|
|
def hostfilename(self, filename):
|
||
|
|
"""
|
||
|
|
Return the name of a node"s file on the host filesystem.
|
||
|
|
|
||
|
|
:param str filename: host file name
|
||
|
|
:return: path to file
|
||
|
|
"""
|
||
|
|
dirname, basename = os.path.split(filename)
|
||
|
|
if not basename:
|
||
|
|
raise ValueError("no basename for filename: %s" % filename)
|
||
|
|
if dirname and dirname[0] == "/":
|
||
|
|
dirname = dirname[1:]
|
||
|
|
dirname = dirname.replace("/", ".")
|
||
|
|
dirname = os.path.join(self.nodedir, dirname)
|
||
|
|
return os.path.join(dirname, basename)
|
||
|
|
|
||
|
|
def opennodefile(self, filename, mode="w"):
|
||
|
|
"""
|
||
|
|
Open a node file, within it"s directory.
|
||
|
|
|
||
|
|
:param str filename: file name to open
|
||
|
|
:param str mode: mode to open file in
|
||
|
|
:return: open file
|
||
|
|
:rtype: file
|
||
|
|
"""
|
||
|
|
hostfilename = self.hostfilename(filename)
|
||
|
|
dirname, _basename = os.path.split(hostfilename)
|
||
|
|
if not os.path.isdir(dirname):
|
||
|
|
os.makedirs(dirname, mode=0o755)
|
||
|
|
return open(hostfilename, mode)
|
||
|
|
|
||
|
|
def nodefile(self, filename, contents, mode=0o644):
|
||
|
|
"""
|
||
|
|
Create a node file with a given mode.
|
||
|
|
|
||
|
|
:param str filename: name of file to create
|
||
|
|
:param contents: contents of file
|
||
|
|
:param int mode: mode for file
|
||
|
|
:return: nothing
|
||
|
|
"""
|
||
|
|
with self.opennodefile(filename, "w") as open_file:
|
||
|
|
open_file.write(contents)
|
||
|
|
os.chmod(open_file.name, mode)
|
||
|
|
logging.info("node(%s) added file: %s; mode: 0%o", self.name, open_file.name, mode)
|
||
|
|
|
||
|
|
def nodefilecopy(self, filename, srcfilename, mode=None):
|
||
|
|
"""
|
||
|
|
Copy a file to a node, following symlinks and preserving metadata.
|
||
|
|
Change file mode if specified.
|
||
|
|
|
||
|
|
:param str filename: file name to copy file to
|
||
|
|
:param str srcfilename: file to copy
|
||
|
|
:param int mode: mode to copy to
|
||
|
|
:return: nothing
|
||
|
|
"""
|
||
|
|
hostfilename = self.hostfilename(filename)
|
||
|
|
shutil.copy2(srcfilename, hostfilename)
|
||
|
|
if mode is not None:
|
||
|
|
os.chmod(hostfilename, mode)
|
||
|
|
logging.info("node(%s) copied file: %s; mode: %s", self.name, hostfilename, mode)
|