72 lines
2.1 KiB
Python
72 lines
2.1 KiB
Python
# Copyright (C) 2014 Nippon Telegraph and Telephone Corporation.
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# Copyright (C) 2014 YAMAMOTO Takashi <yamamoto at valinux co jp>
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import platform
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import socket
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import struct
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from os_ken.lib import sockaddr
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TCP_MD5SIG_LINUX = 0x0e
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TCP_MD5SIG_BSD = 0x10
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def _set_tcp_md5sig_linux(s, addr, key):
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# struct tcp_md5sig {
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# struct sockaddr_storage addr;
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# u16 pad1;
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# u16 keylen;
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# u32 pad2;
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# u8 key[80];
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# }
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af = s.family
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if af == socket.AF_INET:
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sa = sockaddr.sa_in4(addr)
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elif af == socket.AF_INET6:
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sa = sockaddr.sa_in6(addr)
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else:
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raise ValueError("unsupported af %s" % (af,))
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ss = sockaddr.sa_to_ss(sa)
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tcp_md5sig = ss + struct.pack("2xH4x80s", len(key), key)
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s.setsockopt(socket.IPPROTO_TCP, TCP_MD5SIG_LINUX, tcp_md5sig)
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def _set_tcp_md5sig_bsd(s, _addr, _key):
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# NOTE: On this platform, address and key need to be set using setkey(8).
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tcp_md5sig = struct.pack("I", 1)
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s.setsockopt(socket.IPPROTO_TCP, TCP_MD5SIG_BSD, tcp_md5sig)
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def set_tcp_md5sig(s, addr, key):
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"""Enable TCP-MD5 on the given socket.
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:param s: Socket
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:param addr: Associated address. On some platforms, this has no effect.
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:param key: Key. On some platforms, this has no effect.
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"""
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impls = {
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'FreeBSD': _set_tcp_md5sig_bsd,
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'Linux': _set_tcp_md5sig_linux,
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'NetBSD': _set_tcp_md5sig_bsd,
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}
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system = platform.system()
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try:
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impl = impls[system]
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except KeyError:
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raise NotImplementedError("TCP-MD5 unsupported on this platform")
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impl(s, addr, key)
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