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""" util module contains some helper function """ import array import fcntl import os import re import select import signal import socket import struct import subprocess import xmlrpc.client def str_ip(ip_address): """ Converts an IP address from binary format to a string. """ (x1, x2, x3, x4) = struct.unpack("BBBB", ip_address) return ("%u.%u.%u.%u") % (x1, x2, x3, x4) def get_interface_mtu(iface): """ Returns MTU of the given interface. """ s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) indata = iface + ('\0' * (32 - len(iface))) try: outdata = fcntl.ioctl(s.fileno(), 0x8921, indata) # socket.SIOCGIFMTU mtu = struct.unpack("16si12x", outdata)[1] except: return 0 return mtu def get_interface(address): """ Finds first interface that has given address """ bytes = 256 * 32 s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) names = array.array('B', '\0' * bytes) outbytes = struct.unpack('iL', fcntl.ioctl( s.fileno(), 0x8912, # SIOCGIFCONF struct.pack('iL', bytes, names.buffer_info()[0]) ))[0] namestr = names.tostring() for i in range(0, outbytes, 40): name = namestr[i:i + 16].split('\0', 1)[0] if address == str_ip(namestr[i + 20:i + 24]): return name return None # did not find interface we were looking for def uname(): os_info = os.uname() return os_info[2] # return only the kernel version number def start_process(args): try: p = subprocess.Popen(args, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) out, err = p.communicate() return (p.returncode, out, err) except OSError: return (-1, None, None) def get_driver(iface): ret, out, _err = start_process(["ethtool", "-i", iface]) if ret == 0: lines = out.splitlines() driver = "%s(%s)" % (lines[0], lines[1]) # driver name + version else: driver = None return driver def interface_up(iface): """ This function brings given iface up. """ ret, _out, _err = start_process(["ip", "link", "set", iface, "up"]) return ret def interface_assign_ip(iface, ip_addr, mask): """ This function adds an IP address to an interface. If mask is None then a mask will be selected automatically. In case of success this function returns 0. """ interface_ip_op(iface, ip_addr, mask, "add") def interface_remove_ip(iface, ip_addr, mask): """ This function removes an IP address from an interface. If mask is None then a mask will be selected automatically. In case of success this function returns 0. """ interface_ip_op(iface, ip_addr, mask, "del") def interface_ip_op(iface, ip_addr, mask, op): if mask is not None: arg = "%s/%s" % (ip_addr, mask) elif '/' in ip_addr: arg = ip_addr else: (x1, x2, x3, x4) = struct.unpack("BBBB", socket.inet_aton(ip_addr)) if x1 < 128: arg = "%s/8" % ip_addr elif x1 < 192: arg = "%s/16" % ip_addr else: arg = "%s/24" % ip_addr ret, _out, _err = start_process(["ip", "addr", op, arg, "dev", iface]) return ret def interface_get_ip(iface): """ This function returns tuple - ip and mask that was assigned to the interface. """ args = ["ip", "addr", "show", iface] ret, out, _err = start_process(args) if ret == 0: ip = re.search(r'inet (\S+)/(\S+)', out) if ip is not None: return (ip.group(1), ip.group(2)) else: return ret def move_routes(iface1, iface2): """ This function moves routes from iface1 to iface2. """ args = ["ip", "route", "show", "dev", iface1] ret, out, _err = start_process(args) if ret == 0: for route in out.splitlines(): args = ["ip", "route", "replace", "dev", iface2] + route.split() start_process(args) def get_interface_from_routing_decision(ip): """ This function returns the interface through which the given ip address is reachable. """ args = ["ip", "route", "get", ip] ret, out, _err = start_process(args) if ret == 0: iface = re.search(r'dev (\S+)', out) if iface: return iface.group(1) return None def rpc_client(ip, port): return xmlrpc.client.Server("http://%s:%u/" % (ip, port), allow_none=True) def sigint_intercept(): """ Intercept SIGINT from child (the local ovs-test server process). """ signal.signal(signal.SIGINT, signal.SIG_IGN) def start_local_server(port): """ This function spawns an ovs-test server that listens on specified port and blocks till the spawned ovs-test server is ready to accept XML RPC connections. """ p = subprocess.Popen(["ovs-test", "-s", str(port)], stdout=subprocess.PIPE, stderr=subprocess.PIPE, preexec_fn=sigint_intercept) fcntl.fcntl(p.stdout.fileno(), fcntl.F_SETFL, fcntl.fcntl(p.stdout.fileno(), fcntl.F_GETFL) | os.O_NONBLOCK) while p.poll() is None: fd = select.select([p.stdout.fileno()], [], [])[0] if fd: out = p.stdout.readline() if out.startswith("Starting RPC server"): break if p.poll() is not None: raise RuntimeError("Couldn't start local instance of ovs-test server") return p def get_datagram_sizes(mtu1, mtu2): """ This function calculates all the "interesting" datagram sizes so that we test both - receive and send side with different packets sizes. """ s1 = set([8, mtu1 - 100, mtu1 - 28, mtu1]) s2 = set([8, mtu2 - 100, mtu2 - 28, mtu2]) return sorted(s1.union(s2)) def ip_from_cidr(string): """ This function removes the netmask (if present) from the given string and returns the IP address. """ token = string.split("/") return token[0] def bandwidth_to_string(bwidth): """Convert bandwidth from long to string and add units.""" bwidth = bwidth * 8 # Convert back to bits/second if bwidth >= 10000000: return str(int(bwidth / 1000000)) + "Mbps" elif bwidth > 10000: return str(int(bwidth / 1000)) + "Kbps" else: return str(int(bwidth)) + "bps"