Initial import

[ldd.git] / ldd / mdns.py

diff --git a/ldd/mdns.py b/ldd/mdns.py
new file mode 100644 (file)
index 0000000..b1ce504
--- /dev/null
+++ b/ldd/mdns.py
@@ -0,0 +1,42 @@
+#    ldd - DNS implementation in Python
+#    Copyright (C) 2006 Fredrik Tolf <fredrik@dolda2000.com>
+#
+#    This program is free software; you can redistribute it and/or modify
+#    it under the terms of the GNU General Public License as published by
+#    the Free Software Foundation; either version 2 of the License, or
+#    (at your option) any later version.
+#
+#    This program is distributed in the hope that it will be useful,
+#    but WITHOUT ANY WARRANTY; without even the implied warranty of
+#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#    GNU General Public License for more details.
+#
+#    You should have received a copy of the GNU General Public License
+#    along with this program; if not, write to the Free Software
+#    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+
+import socket
+import struct
+
+ip4addr = "224.0.0.251"
+ip6addr = "ff02::fb"
+
+def mkip4sock(port = 5353):
+    sk = socket.socket(socket.AF_INET, socket.SOCK_DGRAM, socket.IPPROTO_UDP)
+    mcastinfo = socket.inet_pton(socket.AF_INET, ip4addr)
+    mcastinfo += socket.inet_pton(socket.AF_INET, "0.0.0.0")
+    sk.setsockopt(socket.SOL_IP, socket.IP_ADD_MEMBERSHIP, mcastinfo)
+    sk.setsockopt(socket.SOL_IP, socket.IP_MULTICAST_TTL, 255)
+    sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sk.bind(("", port))
+    return sk
+
+def mkip6sock(port = 5353):
+    sk = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+    mcastinfo = socket.inet_pton(socket.AF_INET6, ip6addr)
+    mcastinfo += struct.pack("I", 0)
+    sk.setsockopt(socket.SOL_IP, socket.IPV6_JOIN_GROUP, mcastinfo)
+    sk.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_MULTICAST_HOPS, 255)
+    sk.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+    sk.bind(("", port))
+    return sk