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authorJelmer Vernooij <jelmer@samba.org>2010-03-29 16:08:11 +0200
committerJelmer Vernooij <jelmer@samba.org>2010-03-29 18:05:29 +0200
commit4bbc3ff037026c72f3249f59c1b5af69a6ad6d69 (patch)
tree125857a1edbf3246579e51b10f6e62ec875062bc /lib/dnspython/dns/rcode.py
parent89aa3b766b926d19dac4805a7e72433e497ce872 (diff)
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s4-python: Move dnspython to lib/, like the other Python modules
This also avoids it from being installed if it's already present on the system.
Diffstat (limited to 'lib/dnspython/dns/rcode.py')
-rw-r--r--lib/dnspython/dns/rcode.py119
1 files changed, 119 insertions, 0 deletions
diff --git a/lib/dnspython/dns/rcode.py b/lib/dnspython/dns/rcode.py
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+++ b/lib/dnspython/dns/rcode.py
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+# Copyright (C) 2001-2007, 2009, 2010 Nominum, Inc.
+#
+# Permission to use, copy, modify, and distribute this software and its
+# documentation for any purpose with or without fee is hereby granted,
+# provided that the above copyright notice and this permission notice
+# appear in all copies.
+#
+# THE SOFTWARE IS PROVIDED "AS IS" AND NOMINUM DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL NOMINUM BE LIABLE FOR
+# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+# OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+
+"""DNS Result Codes."""
+
+import dns.exception
+
+NOERROR = 0
+FORMERR = 1
+SERVFAIL = 2
+NXDOMAIN = 3
+NOTIMP = 4
+REFUSED = 5
+YXDOMAIN = 6
+YXRRSET = 7
+NXRRSET = 8
+NOTAUTH = 9
+NOTZONE = 10
+BADVERS = 16
+
+_by_text = {
+ 'NOERROR' : NOERROR,
+ 'FORMERR' : FORMERR,
+ 'SERVFAIL' : SERVFAIL,
+ 'NXDOMAIN' : NXDOMAIN,
+ 'NOTIMP' : NOTIMP,
+ 'REFUSED' : REFUSED,
+ 'YXDOMAIN' : YXDOMAIN,
+ 'YXRRSET' : YXRRSET,
+ 'NXRRSET' : NXRRSET,
+ 'NOTAUTH' : NOTAUTH,
+ 'NOTZONE' : NOTZONE,
+ 'BADVERS' : BADVERS
+}
+
+# We construct the inverse mapping programmatically to ensure that we
+# cannot make any mistakes (e.g. omissions, cut-and-paste errors) that
+# would cause the mapping not to be a true inverse.
+
+_by_value = dict([(y, x) for x, y in _by_text.iteritems()])
+
+
+class UnknownRcode(dns.exception.DNSException):
+ """Raised if an rcode is unknown."""
+ pass
+
+def from_text(text):
+ """Convert text into an rcode.
+
+ @param text: the texual rcode
+ @type text: string
+ @raises UnknownRcode: the rcode is unknown
+ @rtype: int
+ """
+
+ if text.isdigit():
+ v = int(text)
+ if v >= 0 and v <= 4095:
+ return v
+ v = _by_text.get(text.upper())
+ if v is None:
+ raise UnknownRcode
+ return v
+
+def from_flags(flags, ednsflags):
+ """Return the rcode value encoded by flags and ednsflags.
+
+ @param flags: the DNS flags
+ @type flags: int
+ @param ednsflags: the EDNS flags
+ @type ednsflags: int
+ @raises ValueError: rcode is < 0 or > 4095
+ @rtype: int
+ """
+
+ value = (flags & 0x000f) | ((ednsflags >> 20) & 0xff0)
+ if value < 0 or value > 4095:
+ raise ValueError('rcode must be >= 0 and <= 4095')
+ return value
+
+def to_flags(value):
+ """Return a (flags, ednsflags) tuple which encodes the rcode.
+
+ @param value: the rcode
+ @type value: int
+ @raises ValueError: rcode is < 0 or > 4095
+ @rtype: (int, int) tuple
+ """
+
+ if value < 0 or value > 4095:
+ raise ValueError('rcode must be >= 0 and <= 4095')
+ v = value & 0xf
+ ev = long(value & 0xff0) << 20
+ return (v, ev)
+
+def to_text(value):
+ """Convert rcode into text.
+
+ @param value: the rcode
+ @type value: int
+ @rtype: string
+ """
+
+ text = _by_value.get(value)
+ if text is None:
+ text = str(value)
+ return text