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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 os_ken.lib import sockaddr
TCP_MD5SIG_LINUX = 0x0e
TCP_MD5SIG_BSD = 0x10
def _set_tcp_md5sig_linux(s, addr, key):
# struct tcp_md5sig {
# struct sockaddr_storage addr;
# u16 pad1;
# u16 keylen;
# u32 pad2;
# u8 key[80];
# }
af = s.family
if af == socket.AF_INET:
sa = sockaddr.sa_in4(addr)
elif af == socket.AF_INET6:
sa = sockaddr.sa_in6(addr)
else:
raise ValueError("unsupported af %s" % (af,))
ss = sockaddr.sa_to_ss(sa)
tcp_md5sig = ss + struct.pack("2xH4x80s", len(key), key)
s.setsockopt(socket.IPPROTO_TCP, TCP_MD5SIG_LINUX, tcp_md5sig)
def _set_tcp_md5sig_bsd(s, _addr, _key):
# NOTE: On this platform, address and key need to be set using setkey(8).
tcp_md5sig = struct.pack("I", 1)
s.setsockopt(socket.IPPROTO_TCP, TCP_MD5SIG_BSD, tcp_md5sig)
def set_tcp_md5sig(s, addr, key):
"""Enable TCP-MD5 on the given socket.
:param s: Socket
:param addr: Associated address. On some platforms, this has no effect.
:param key: Key. On some platforms, this has no effect.
"""
impls = {
'FreeBSD': _set_tcp_md5sig_bsd,
'Linux': _set_tcp_md5sig_linux,
'NetBSD': _set_tcp_md5sig_bsd,
}
system = platform.system()
try:
impl = impls[system]
except KeyError:
raise NotImplementedError("TCP-MD5 unsupported on this platform")
impl(s, addr, key)
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