| 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 |