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1 | # ldd - DNS implementation in Python |
2 | # Copyright (C) 2006 Fredrik Tolf <fredrik@dolda2000.com> |
3 | # |
4 | # This program is free software; you can redistribute it and/or modify |
5 | # it under the terms of the GNU General Public License as published by |
6 | # the Free Software Foundation; either version 2 of the License, or |
7 | # (at your option) any later version. |
8 | # |
9 | # This program is distributed in the hope that it will be useful, |
10 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | # GNU General Public License for more details. |
13 | # |
14 | # You should have received a copy of the GNU General Public License |
15 | # along with this program; if not, write to the Free Software |
16 | # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
17 | |
18 | import socket |
19 | import struct |
20 | |
21 | ip4addr = "224.0.0.251" |
22 | ip6addr = "ff02::fb" |
23 | |
24 | def mkip4sock(port = 5353): |
25 | sk = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP) |
26 | mcastinfo = socket.inet_pton(socket.AF_INET, ip4addr) |
27 | mcastinfo += socket.inet_pton(socket.AF_INET, "0.0.0.0") |
28 | sk.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, mcastinfo) |
29 | sk.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, 255) |
30 | sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) |
31 | sk.bind(("", port)) |
32 | return sk |
33 | |
34 | def mkip6sock(port = 5353): |
35 | sk = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) |
36 | mcastinfo = socket.inet_pton(socket.AF_INET6, ip6addr) |
37 | mcastinfo += struct.pack("I", 0) |
38 | sk.setsockopt(socket.SOL_IP, socket.IPV6_JOIN_GROUP, mcastinfo) |
39 | sk.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, 255) |
40 | sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) |
41 | sk.bind(("", port)) |
42 | return sk |