1 # Copyright (c) 2011, 2012 Nicira, Inc.
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at:
7 # http://www.apache.org/licenses/LICENSE-2.0
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
16 util module contains some helper function
29 import six.moves.xmlrpc_client
32 def str_ip(ip_address):
34 Converts an IP address from binary format to a string.
36 (x1, x2, x3, x4) = struct.unpack("BBBB", ip_address)
37 return ("%u.%u.%u.%u") % (x1, x2, x3, x4)
40 def get_interface_mtu(iface):
42 Returns MTU of the given interface.
44 s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
45 indata = iface + ('\0' * (32 - len(iface)))
47 outdata = fcntl.ioctl(s.fileno(), 0x8921, indata) # socket.SIOCGIFMTU
48 mtu = struct.unpack("16si12x", outdata)[1]
55 def get_interface(address):
57 Finds first interface that has given address
60 s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
61 names = array.array('B', '\0' * bytes)
62 outbytes = struct.unpack('iL', fcntl.ioctl(
65 struct.pack('iL', bytes, names.buffer_info()[0])
67 namestr = names.tostring()
69 for i in range(0, outbytes, 40):
70 name = namestr[i:i + 16].split('\0', 1)[0]
71 if address == str_ip(namestr[i + 20:i + 24]):
73 return None # did not find interface we were looking for
78 return os_info[2] # return only the kernel version number
81 def start_process(args):
83 p = subprocess.Popen(args,
84 stdin=subprocess.PIPE,
85 stdout=subprocess.PIPE,
86 stderr=subprocess.PIPE)
87 out, err = p.communicate()
88 return (p.returncode, out, err)
89 except exceptions.OSError:
90 return (-1, None, None)
93 def get_driver(iface):
94 ret, out, _err = start_process(["ethtool", "-i", iface])
96 lines = out.splitlines()
97 driver = "%s(%s)" % (lines[0], lines[1]) # driver name + version
103 def interface_up(iface):
105 This function brings given iface up.
107 ret, _out, _err = start_process(["ifconfig", iface, "up"])
111 def interface_assign_ip(iface, ip_addr, mask):
113 This function allows to assign IP address to an interface. If mask is an
114 empty string then ifconfig will decide what kind of mask to use. The
115 caller can also specify the mask by using CIDR notation in ip argument by
116 leaving the mask argument as an empty string. In case of success this
119 args = ["ifconfig", iface, ip_addr]
121 args.append("netmask")
123 ret, _out, _err = start_process(args)
127 def interface_get_ip(iface):
129 This function returns tuple - ip and mask that was assigned to the
132 args = ["ifconfig", iface]
133 ret, out, _err = start_process(args)
136 ip = re.search(r'inet addr:(\S+)', out)
137 mask = re.search(r'Mask:(\S+)', out)
138 if ip is not None and mask is not None:
139 return (ip.group(1), mask.group(1))
144 def move_routes(iface1, iface2):
146 This function moves routes from iface1 to iface2.
148 args = ["ip", "route", "show", "dev", iface1]
149 ret, out, _err = start_process(args)
151 for route in out.splitlines():
152 args = ["ip", "route", "replace", "dev", iface2] + route.split()
156 def get_interface_from_routing_decision(ip):
158 This function returns the interface through which the given ip address
161 args = ["ip", "route", "get", ip]
162 ret, out, _err = start_process(args)
164 iface = re.search(r'dev (\S+)', out)
166 return iface.group(1)
170 def rpc_client(ip, port):
171 return six.moves.xmlrpc_client.Server("http://%s:%u/" % (ip, port),
175 def sigint_intercept():
177 Intercept SIGINT from child (the local ovs-test server process).
179 signal.signal(signal.SIGINT, signal.SIG_IGN)
182 def start_local_server(port):
184 This function spawns an ovs-test server that listens on specified port
185 and blocks till the spawned ovs-test server is ready to accept XML RPC
188 p = subprocess.Popen(["ovs-test", "-s", str(port)],
189 stdout=subprocess.PIPE, stderr=subprocess.PIPE,
190 preexec_fn=sigint_intercept)
191 fcntl.fcntl(p.stdout.fileno(), fcntl.F_SETFL,
192 fcntl.fcntl(p.stdout.fileno(), fcntl.F_GETFL) | os.O_NONBLOCK)
194 while p.poll() is None:
195 fd = select.select([p.stdout.fileno()], [], [])[0]
197 out = p.stdout.readline()
198 if out.startswith("Starting RPC server"):
200 if p.poll() is not None:
201 raise RuntimeError("Couldn't start local instance of ovs-test server")
205 def get_datagram_sizes(mtu1, mtu2):
207 This function calculates all the "interesting" datagram sizes so that
208 we test both - receive and send side with different packets sizes.
210 s1 = set([8, mtu1 - 100, mtu1 - 28, mtu1])
211 s2 = set([8, mtu2 - 100, mtu2 - 28, mtu2])
212 return sorted(s1.union(s2))
215 def ip_from_cidr(string):
217 This function removes the netmask (if present) from the given string and
218 returns the IP address.
220 token = string.split("/")
224 def bandwidth_to_string(bwidth):
225 """Convert bandwidth from long to string and add units."""
226 bwidth = bwidth * 8 # Convert back to bits/second
227 if bwidth >= 10000000:
228 return str(int(bwidth / 1000000)) + "Mbps"
230 return str(int(bwidth / 1000)) + "Kbps"
232 return str(int(bwidth)) + "bps"