1 files changed, 170 insertions, 0 deletions
diff --git a/third_party/dnspython/dns/rdtypes/IN/APL.py b/third_party/dnspython/dns/rdtypes/IN/APL.py
new file mode 100644
index 0000000000..260fd6f39f
--- /dev/null
+++ b/third_party/dnspython/dns/rdtypes/IN/APL.py
@@ -0,0 +1,170 @@
+# Copyright (C) 2003-2007, 2009-2011 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.
+
+import cStringIO
+import struct
+
+import dns.exception
+import dns.inet
+import dns.rdata
+import dns.tokenizer
+
+class APLItem(object):
+    """An APL list item.
+
+    @ivar family: the address family (IANA address family registry)
+    @type family: int
+    @ivar negation: is this item negated?
+    @type negation: bool
+    @ivar address: the address
+    @type address: string
+    @ivar prefix: the prefix length
+    @type prefix: int
+    """
+
+    __slots__ = ['family', 'negation', 'address', 'prefix']
+
+    def __init__(self, family, negation, address, prefix):
+        self.family = family
+        self.negation = negation
+        self.address = address
+        self.prefix = prefix
+
+    def __str__(self):
+        if self.negation:
+            return "!%d:%s/%s" % (self.family, self.address, self.prefix)
+        else:
+            return "%d:%s/%s" % (self.family, self.address, self.prefix)
+
+    def to_wire(self, file):
+        if self.family == 1:
+            address = dns.inet.inet_pton(dns.inet.AF_INET, self.address)
+        elif self.family == 2:
+            address = dns.inet.inet_pton(dns.inet.AF_INET6, self.address)
+        else:
+            address = self.address.decode('hex_codec')
+        #
+        # Truncate least significant zero bytes.
+        #
+        last = 0
+        for i in xrange(len(address) - 1, -1, -1):
+            if address[i] != chr(0):
+                last = i + 1
+                break
+        address = address[0 : last]
+        l = len(address)
+        assert l < 128
+        if self.negation:
+            l |= 0x80
+        header = struct.pack('!HBB', self.family, self.prefix, l)
+        file.write(header)
+        file.write(address)
+
+class APL(dns.rdata.Rdata):
+    """APL record.
+
+    @ivar items: a list of APL items
+    @type items: list of APL_Item
+    @see: RFC 3123"""
+
+    __slots__ = ['items']
+
+    def __init__(self, rdclass, rdtype, items):
+        super(APL, self).__init__(rdclass, rdtype)
+        self.items = items
+
+    def to_text(self, origin=None, relativize=True, **kw):
+        return ' '.join(map(lambda x: str(x), self.items))
+
+    def from_text(cls, rdclass, rdtype, tok, origin = None, relativize = True):
+        items = []
+        while 1:
+            token = tok.get().unescape()
+            if token.is_eol_or_eof():
+                break
+            item = token.value
+            if item[0] == '!':
+                negation = True
+                item = item[1:]
+            else:
+                negation = False
+            (family, rest) = item.split(':', 1)
+            family = int(family)
+            (address, prefix) = rest.split('/', 1)
+            prefix = int(prefix)
+            item = APLItem(family, negation, address, prefix)
+            items.append(item)
+
+        return cls(rdclass, rdtype, items)
+
+    from_text = classmethod(from_text)
+
+    def to_wire(self, file, compress = None, origin = None):
+        for item in self.items:
+            item.to_wire(file)
+
+    def from_wire(cls, rdclass, rdtype, wire, current, rdlen, origin = None):
+        items = []
+        while 1:
+            if rdlen < 4:
+                raise dns.exception.FormError
+            header = struct.unpack('!HBB', wire[current : current + 4])
+            afdlen = header[2]
+            if afdlen > 127:
+                negation = True
+                afdlen -= 128
+            else:
+                negation = False
+            current += 4
+            rdlen -= 4
+            if rdlen < afdlen:
+                raise dns.exception.FormError
+            address = wire[current : current + afdlen].unwrap()
+            l = len(address)
+            if header[0] == 1:
+                if l < 4:
+                    address += '\x00' * (4 - l)
+                address = dns.inet.inet_ntop(dns.inet.AF_INET, address)
+            elif header[0] == 2:
+                if l < 16:
+                    address += '\x00' * (16 - l)
+                address = dns.inet.inet_ntop(dns.inet.AF_INET6, address)
+            else:
+                #
+                # This isn't really right according to the RFC, but it
+                # seems better than throwing an exception
+                #
+                address = address.encode('hex_codec')
+            current += afdlen
+            rdlen -= afdlen
+            item = APLItem(header[0], negation, address, header[1])
+            items.append(item)
+            if rdlen == 0:
+                break
+        return cls(rdclass, rdtype, items)
+
+    from_wire = classmethod(from_wire)
+
+    def _cmp(self, other):
+        f = cStringIO.StringIO()
+        self.to_wire(f)
+        wire1 = f.getvalue()
+        f.seek(0)
+        f.truncate()
+        other.to_wire(f)
+        wire2 = f.getvalue()
+        f.close()
+
+        return cmp(wire1, wire2)