/usr/lib/python2.7/dist-packages/mysql/connector/network.py is in python-mysql.connector 1.2.3-2.
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# Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
# MySQL Connector/Python is licensed under the terms of the GPLv2
# <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most
# MySQL Connectors. There are special exceptions to the terms and
# conditions of the GPLv2 as it is applied to this software, see the
# FOSS License Exception
# <http://www.mysql.com/about/legal/licensing/foss-exception.html>.
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
"""Module implementing low-level socket communication with MySQL servers.
"""
import socket
import struct
from collections import deque
import zlib
try:
import ssl
except ImportError:
# If import fails, we don't have SSL support.
pass
from mysql.connector import constants, errors
def _strioerror(err):
"""Reformat the IOError error message
This function reformats the IOError error message.
"""
if not err.errno:
return str(err)
return '{errno} {strerr}'.format(errno=err.errno, strerr=err.strerror)
def _prepare_packets(buf, pktnr):
"""Prepare a packet for sending to the MySQL server"""
pkts = []
buflen = len(buf)
maxpktlen = constants.MAX_PACKET_LENGTH
while buflen > maxpktlen:
pkts.append('\xff\xff\xff' + struct.pack('<B', pktnr)
+ buf[:maxpktlen])
buf = buf[maxpktlen:]
buflen = len(buf)
pktnr = pktnr + 1
pkts.append(struct.pack('<I', buflen)[0:3]
+ struct.pack('<B', pktnr) + buf)
return pkts
class BaseMySQLSocket(object):
"""Base class for MySQL socket communication
This class should not be used directly but overloaded, changing the
at least the open_connection()-method. Examples of subclasses are
mysql.connector.network.MySQLTCPSocket
mysql.connector.network.MySQLUnixSocket
"""
def __init__(self):
self.sock = None # holds the socket connection
self._connection_timeout = None
self._packet_number = -1
self._packet_queue = deque()
self.recvsize = 8192
@property
def next_packet_number(self):
"""Generates the next packet number"""
self._packet_number = self._packet_number + 1
if self._packet_number > 255:
self._packet_number = 0
return self._packet_number
def open_connection(self):
"""Open the socket"""
raise NotImplementedError
def get_address(self):
"""Get the location of the socket"""
raise NotImplementedError
def close_connection(self):
"""Close the socket"""
try:
self.sock.close()
del self._packet_queue
except (socket.error, AttributeError):
pass
def send_plain(self, buf, packet_number=None):
"""Send packets to the MySQL server"""
if packet_number is None:
self.next_packet_number # pylint: disable=W0104
else:
self._packet_number = packet_number
packets = _prepare_packets(buf, self._packet_number)
for packet in packets:
try:
self.sock.sendall(packet)
except IOError as err:
raise errors.OperationalError(
errno=2055, values=(self.get_address(), _strioerror(err)))
except AttributeError:
raise errors.OperationalError(errno=2006)
send = send_plain
def send_compressed(self, buf, packet_number=None):
"""Send compressed packets to the MySQL server"""
if packet_number is None:
self.next_packet_number # pylint: disable=W0104
else:
self._packet_number = packet_number
pktnr = self._packet_number
pllen = len(buf)
zpkts = []
maxpktlen = constants.MAX_PACKET_LENGTH
if pllen > maxpktlen:
pkts = _prepare_packets(buf, pktnr)
tmpbuf = ''.join(pkts)
del pkts
seqid = 0
zbuf = zlib.compress(tmpbuf[:16384])
zpkts.append(struct.pack('<I', len(zbuf))[0:3]
+ struct.pack('<B', seqid)
+ '\x00\x40\x00' + zbuf)
tmpbuf = tmpbuf[16384:]
pllen = len(tmpbuf)
seqid = seqid + 1
while pllen > maxpktlen:
zbuf = zlib.compress(tmpbuf[:maxpktlen])
zpkts.append(struct.pack('<I', len(zbuf))[0:3]
+ struct.pack('<B', seqid)
+ '\xff\xff\xff' + zbuf)
tmpbuf = tmpbuf[maxpktlen:]
pllen = len(tmpbuf)
seqid = seqid + 1
if tmpbuf:
zbuf = zlib.compress(tmpbuf)
zpkts.append(struct.pack('<I', len(zbuf))[0:3]
+ struct.pack('<B', seqid)
+ struct.pack('<I', pllen)[0:3]
+ zbuf)
del tmpbuf
else:
pkt = (struct.pack('<I', pllen)[0:3]
+ struct.pack('<B', pktnr)
+ buf)
pllen = len(pkt)
if pllen > 50:
zbuf = zlib.compress(pkt)
zpkts.append(struct.pack('<I', len(zbuf))[0:3]
+ struct.pack('<B', 0)
+ struct.pack('<I', pllen)[0:3]
+ zbuf)
else:
zpkts.append(struct.pack('<I', pllen)[0:3]
+ struct.pack('<B', 0)
+ struct.pack('<I', 0)[0:3]
+ pkt)
for zip_packet in zpkts:
try:
self.sock.sendall(zip_packet)
except IOError as err:
raise errors.OperationalError(
errno=2055, values=(self.get_address(), _strioerror(err)))
except AttributeError:
raise errors.OperationalError(errno=2006)
def recv_plain(self):
"""Receive packets from the MySQL server"""
packet = ''
try:
# Read the header of the MySQL packet, 4 bytes
packet = self.sock.recv(1)
while len(packet) < 4:
chunk = self.sock.recv(1)
if not chunk:
raise errors.InterfaceError(errno=2013)
packet += chunk
# Save the packet number and total packet length from header
self._packet_number = ord(packet[3])
packet_totlen = struct.unpack("<I", packet[0:3] + '\x00')[0] + 4
# Read the rest of the packet
rest = packet_totlen - len(packet)
while rest > 0:
chunk = self.sock.recv(rest)
if not chunk:
raise errors.InterfaceError(errno=2013)
packet += chunk
rest = packet_totlen - len(packet)
return packet
except IOError as err:
raise errors.OperationalError(
errno=2055, values=(self.get_address(), _strioerror(err)))
recv = recv_plain
def _split_zipped_payload(self, packet_bunch):
"""Split compressed payload"""
while packet_bunch:
payload_length = struct.unpack("<I",
packet_bunch[0:3] + '\x00')[0]
self._packet_queue.append(packet_bunch[0:payload_length + 4])
packet_bunch = packet_bunch[payload_length + 4:]
def recv_compressed(self):
"""Receive compressed packets from the MySQL server"""
try:
return self._packet_queue.popleft()
except IndexError:
pass
header = ''
packets = []
try:
abyte = self.sock.recv(1)
while abyte and len(header) < 7:
header += abyte
abyte = self.sock.recv(1)
while header:
if len(header) < 7:
raise errors.InterfaceError(errno=2013)
zip_payload_length = struct.unpack("<I",
header[0:3] + '\x00')[0]
payload_length = struct.unpack("<I",
header[4:7] + '\x00')[0]
zip_payload = abyte
while len(zip_payload) < zip_payload_length:
chunk = self.sock.recv(zip_payload_length
- len(zip_payload))
if len(chunk) == 0:
raise errors.InterfaceError(errno=2013)
zip_payload = zip_payload + chunk
if payload_length == 0:
self._split_zipped_payload(zip_payload)
return self._packet_queue.popleft()
packets.append(header + zip_payload)
if payload_length != 16384:
break
header = ''
abyte = self.sock.recv(1)
while abyte and len(header) < 7:
header += abyte
abyte = self.sock.recv(1)
except IOError as err:
raise errors.OperationalError(
errno=2055, values=(self.get_address(), _strioerror(err)))
tmp = []
for packet in packets:
payload_length = struct.unpack("<I", header[4:7] + '\x00')[0]
if payload_length == 0:
tmp.append(packet[7:])
else:
tmp.append(zlib.decompress(packet[7:]))
self._split_zipped_payload(''.join(tmp))
del tmp
try:
return self._packet_queue.popleft()
except IndexError:
pass
def set_connection_timeout(self, timeout):
"""Set the connection timeout"""
self._connection_timeout = timeout
# pylint: disable=C0103
def switch_to_ssl(self, ca, cert, key, verify_cert=False):
"""Switch the socket to use SSL"""
if not self.sock:
raise errors.InterfaceError(errno=2048)
try:
if verify_cert:
cert_reqs = ssl.CERT_REQUIRED
else:
cert_reqs = ssl.CERT_NONE
self.sock = ssl.wrap_socket(
self.sock, keyfile=key, certfile=cert, ca_certs=ca,
cert_reqs=cert_reqs, do_handshake_on_connect=False,
ssl_version=ssl.PROTOCOL_TLSv1)
self.sock.do_handshake()
except NameError:
raise errors.NotSupportedError(
"Python installation has no SSL support")
except (ssl.SSLError, IOError) as err:
raise errors.InterfaceError(
errno=2055, values=(self.get_address(), _strioerror(err)))
# pylint: enable=C0103
class MySQLUnixSocket(BaseMySQLSocket):
"""MySQL socket class using UNIX sockets
Opens a connection through the UNIX socket of the MySQL Server.
"""
def __init__(self, unix_socket='/tmp/mysql.sock'):
super(MySQLUnixSocket, self).__init__()
self._unix_socket = unix_socket
def get_address(self):
return self._unix_socket
def open_connection(self):
try:
self.sock = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
self.sock.settimeout(self._connection_timeout)
self.sock.connect(self._unix_socket)
except IOError as err:
raise errors.InterfaceError(
errno=2002, values=(self.get_address(), _strioerror(err)))
except StandardError as err:
raise errors.InterfaceError(str(err))
class MySQLTCPSocket(BaseMySQLSocket):
"""MySQL socket class using TCP/IP
Opens a TCP/IP connection to the MySQL Server.
"""
def __init__(self, host='127.0.0.1', port=3306, force_ipv6=False):
super(MySQLTCPSocket, self).__init__()
self.server_host = host
self.server_port = port
self.force_ipv6 = force_ipv6
self._family = 0
def get_address(self):
return "%s:%s" % (self.server_host, self.server_port)
def open_connection(self):
"""Open the TCP/IP connection to the MySQL server
"""
# Get address information
addrinfo = None
try:
addrinfos = socket.getaddrinfo(self.server_host, self.server_port,
0, socket.SOCK_STREAM)
# If multiple results we favor IPv4, unless IPv6 was forced.
for info in addrinfos:
if self.force_ipv6 and info[0] == socket.AF_INET6:
addrinfo = info
break
elif info[0] == socket.AF_INET:
addrinfo = info
break
if self.force_ipv6 and not addrinfo:
raise errors.InterfaceError(
"No IPv6 address found for %s" % self.server_host)
if not addrinfo:
addrinfo = addrinfos[0]
except IOError as err:
raise errors.InterfaceError(
errno=2003, values=(self.get_address(), _strioerror(err)))
(self._family, socktype, proto, _, sockaddr) = addrinfo
# Instanciate the socket and connect
try:
self.sock = socket.socket(self._family, socktype, proto)
self.sock.settimeout(self._connection_timeout)
self.sock.connect(sockaddr)
except IOError as err:
raise errors.InterfaceError(
errno=2003, values=(self.get_address(), _strioerror(err)))
except StandardError as err:
raise errors.InterfaceError(str(err))
except:
raise
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