/usr/lib/python2.7/dist-packages/ovs/socket_util.py is in python-openvswitch 2.5.5-0ubuntu0.16.04.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 | # Copyright (c) 2010, 2012, 2014, 2015 Nicira, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at:
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import errno
import os
import os.path
import random
import select
import socket
import sys
import ovs.fatal_signal
import ovs.poller
import ovs.vlog
vlog = ovs.vlog.Vlog("socket_util")
def make_short_name(long_name):
if long_name is None:
return None
long_name = os.path.abspath(long_name)
long_dirname = os.path.dirname(long_name)
tmpdir = os.getenv('TMPDIR', '/tmp')
for x in xrange(0, 1000):
link_name = \
'%s/ovs-un-py-%d-%d' % (tmpdir, random.randint(0, 10000), x)
try:
os.symlink(long_dirname, link_name)
ovs.fatal_signal.add_file_to_unlink(link_name)
return os.path.join(link_name, os.path.basename(long_name))
except OSError, e:
if e.errno != errno.EEXIST:
break
raise Exception("Failed to create temporary symlink")
def free_short_name(short_name):
if short_name is None:
return
link_name = os.path.dirname(short_name)
ovs.fatal_signal.unlink_file_now(link_name)
def make_unix_socket(style, nonblock, bind_path, connect_path, short=False):
"""Creates a Unix domain socket in the given 'style' (either
socket.SOCK_DGRAM or socket.SOCK_STREAM) that is bound to 'bind_path' (if
'bind_path' is not None) and connected to 'connect_path' (if 'connect_path'
is not None). If 'nonblock' is true, the socket is made non-blocking.
Returns (error, socket): on success 'error' is 0 and 'socket' is a new
socket object, on failure 'error' is a positive errno value and 'socket' is
None."""
try:
sock = socket.socket(socket.AF_UNIX, style)
except socket.error, e:
return get_exception_errno(e), None
try:
if nonblock:
set_nonblocking(sock)
if bind_path is not None:
# Delete bind_path but ignore ENOENT.
try:
os.unlink(bind_path)
except OSError, e:
if e.errno != errno.ENOENT:
return e.errno, None
ovs.fatal_signal.add_file_to_unlink(bind_path)
sock.bind(bind_path)
try:
if sys.hexversion >= 0x02060000:
os.fchmod(sock.fileno(), 0700)
else:
os.chmod("/dev/fd/%d" % sock.fileno(), 0700)
except OSError, e:
pass
if connect_path is not None:
try:
sock.connect(connect_path)
except socket.error, e:
if get_exception_errno(e) != errno.EINPROGRESS:
raise
return 0, sock
except socket.error, e:
sock.close()
if (bind_path is not None and
os.path.exists(bind_path)):
ovs.fatal_signal.unlink_file_now(bind_path)
eno = ovs.socket_util.get_exception_errno(e)
if (eno == "AF_UNIX path too long" and
os.uname()[0] == "Linux"):
short_connect_path = None
short_bind_path = None
connect_dirfd = None
bind_dirfd = None
# Try workaround using /proc/self/fd
if connect_path is not None:
dirname = os.path.dirname(connect_path)
basename = os.path.basename(connect_path)
try:
connect_dirfd = os.open(dirname, os.O_DIRECTORY | os.O_RDONLY)
except OSError, err:
return get_exception_errno(err), None
short_connect_path = "/proc/self/fd/%d/%s" % (connect_dirfd, basename)
if bind_path is not None:
dirname = os.path.dirname(bind_path)
basename = os.path.basename(bind_path)
try:
bind_dirfd = os.open(dirname, os.O_DIRECTORY | os.O_RDONLY)
except OSError, err:
return get_exception_errno(err), None
short_bind_path = "/proc/self/fd/%d/%s" % (bind_dirfd, basename)
try:
return make_unix_socket(style, nonblock, short_bind_path, short_connect_path)
finally:
if connect_dirfd is not None:
os.close(connect_dirfd)
if bind_dirfd is not None:
os.close(bind_dirfd)
elif (eno == "AF_UNIX path too long"):
if short:
return get_exception_errno(e), None
short_bind_path = None
try:
short_bind_path = make_short_name(bind_path)
short_connect_path = make_short_name(connect_path)
except:
free_short_name(short_bind_path)
return errno.ENAMETOOLONG, None
try:
return make_unix_socket(style, nonblock, short_bind_path,
short_connect_path, short=True)
finally:
free_short_name(short_bind_path)
free_short_name(short_connect_path)
else:
return get_exception_errno(e), None
def check_connection_completion(sock):
p = ovs.poller.SelectPoll()
p.register(sock, ovs.poller.POLLOUT)
pfds = p.poll(0)
if len(pfds) == 1:
revents = pfds[0][1]
if revents & ovs.poller.POLLERR:
try:
# The following should raise an exception.
socket.send("\0", socket.MSG_DONTWAIT)
# (Here's where we end up if it didn't.)
# XXX rate-limit
vlog.err("poll return POLLERR but send succeeded")
return errno.EPROTO
except socket.error, e:
return get_exception_errno(e)
else:
return 0
else:
return errno.EAGAIN
def is_valid_ipv4_address(address):
try:
socket.inet_pton(socket.AF_INET, address)
except AttributeError:
try:
socket.inet_aton(address)
except socket.error:
return False
except socket.error:
return False
return True
def inet_parse_active(target, default_port):
address = target.split(":")
if len(address) >= 2:
host_name = ":".join(address[0:-1]).lstrip('[').rstrip(']')
port = int(address[-1])
else:
if default_port:
port = default_port
else:
raise ValueError("%s: port number must be specified" % target)
host_name = address[0]
if not host_name:
raise ValueError("%s: bad peer name format" % target)
return (host_name, port)
def inet_open_active(style, target, default_port, dscp):
address = inet_parse_active(target, default_port)
try:
is_addr_inet = is_valid_ipv4_address(address[0])
if is_addr_inet:
sock = socket.socket(socket.AF_INET, style, 0)
family = socket.AF_INET
else:
sock = socket.socket(socket.AF_INET6, style, 0)
family = socket.AF_INET6
except socket.error, e:
return get_exception_errno(e), None
try:
set_nonblocking(sock)
set_dscp(sock, family, dscp)
try:
sock.connect(address)
except socket.error, e:
if get_exception_errno(e) != errno.EINPROGRESS:
raise
return 0, sock
except socket.error, e:
sock.close()
return get_exception_errno(e), None
def get_exception_errno(e):
"""A lot of methods on Python socket objects raise socket.error, but that
exception is documented as having two completely different forms of
arguments: either a string or a (errno, string) tuple. We only want the
errno."""
if type(e.args) == tuple:
return e.args[0]
else:
return errno.EPROTO
null_fd = -1
def get_null_fd():
"""Returns a readable and writable fd for /dev/null, if successful,
otherwise a negative errno value. The caller must not close the returned
fd (because the same fd will be handed out to subsequent callers)."""
global null_fd
if null_fd < 0:
try:
null_fd = os.open("/dev/null", os.O_RDWR)
except OSError, e:
vlog.err("could not open /dev/null: %s" % os.strerror(e.errno))
return -e.errno
return null_fd
def write_fully(fd, buf):
"""Returns an (error, bytes_written) tuple where 'error' is 0 on success,
otherwise a positive errno value, and 'bytes_written' is the number of
bytes that were written before the error occurred. 'error' is 0 if and
only if 'bytes_written' is len(buf)."""
bytes_written = 0
if len(buf) == 0:
return 0, 0
while True:
try:
retval = os.write(fd, buf)
assert retval >= 0
if retval == len(buf):
return 0, bytes_written + len(buf)
elif retval == 0:
vlog.warn("write returned 0")
return errno.EPROTO, bytes_written
else:
bytes_written += retval
buf = buf[:retval]
except OSError, e:
return e.errno, bytes_written
def set_nonblocking(sock):
try:
sock.setblocking(0)
except socket.error, e:
vlog.err("could not set nonblocking mode on socket: %s"
% os.strerror(get_exception_errno(e)))
def set_dscp(sock, family, dscp):
if dscp > 63:
raise ValueError("Invalid dscp %d" % dscp)
val = dscp << 2
if family == socket.AF_INET:
try:
sock.setsockopt(socket.IPPROTO_IP, socket.IP_TOS, val)
except socket.error, e:
raise
elif family == socket.AF_INET6:
try:
sock.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_TCLASS, val)
except socket.error, e:
raise
else:
raise
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