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# Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
# Copyright (C) 2014 YAMAMOTO Takashi <yamamoto at valinux co jp>
#
# 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 platform
import socket
import struct
from ryu.lib import addrconv
system = platform.system()
if system == 'Linux':
# on linux,
# no ss_len
# u16 ss_family
_HDR_FMT = "H"
_HAVE_SS_LEN = False
else:
# assume
# u8 ss_len
# u8 ss_family
_HDR_FMT = "BB"
_HAVE_SS_LEN = True
# RFC 2553
_SS_MAXSIZE = 128
_SS_ALIGNSIZE = 8
_SIN_SIZE = 16 # sizeof(struct sockaddr_in)
_HDR_LEN = struct.calcsize(_HDR_FMT)
def _hdr(ss_len, af):
if _HAVE_SS_LEN:
return struct.pack(_HDR_FMT, ss_len, af)
else:
return struct.pack(_HDR_FMT, af)
def _pad_to(data, total_len):
pad_len = total_len - len(data)
return data + pad_len * '\0'
def sa_in4(addr, port=0):
data = struct.pack("!H4s", port, addrconv.ipv4.text_to_bin(addr))
hdr = _hdr(_SIN_SIZE, socket.AF_INET)
return _pad_to(hdr + data, _SIN_SIZE)
def sa_in6(addr, port=0, flowinfo=0, scope_id=0):
data = struct.pack("!HI16sI", port, flowinfo,
addrconv.ipv6.text_to_bin(addr), scope_id)
hdr = _hdr(_HDR_LEN + len(data), socket.AF_INET6)
return hdr + data
def sa_to_ss(sa):
return _pad_to(sa, _SS_MAXSIZE)
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