def _question_line(self, section):
"""Process one line from the text format question section."""
token = self.tok.get(want_leading=True)
if not token.is_whitespace():
self.last_name = mname.from_text(token.value, None)
name = self.last_name
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = rdataclass.IN
# Type
rdtype = rdatatype.from_text(token.value)
self.message.find_rrset(self.message.question,
name,
rdclass,
rdtype,
create=True,
force_unique=True)
if self.updating:
self.zone_rdclass = rdclass
self.tok.get_eol()
def _question_line(self, section):
"""Process one line from the text format question section."""
token = self.tok.get(want_leading = True)
if not token.is_whitespace():
self.last_name = mname.from_text(token.value, None)
name = self.last_name
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = rdataclass.IN
# Type
rdtype = rdatatype.from_text(token.value)
self.message.find_rrset(self.message.question, name,
rdclass, rdtype, create=True,
force_unique=True)
if self.updating:
self.zone_rdclass = rdclass
self.tok.get_eol()
def make_query(qname,
rdtype,
rdclass=rdataclass.IN,
use_edns=None,
want_dnssec=False,
ednsflags=0,
payload=1280,
request_payload=None,
options=None):
"""Make a query message.
The query name, type, and class may all be specified either
as objects of the appropriate type, or as strings.
The query will have a randomly choosen query id, and its DNS flags
will be set to flags.RD.
@param qname: The query name.
@type qname: mname.Name object or string
@param rdtype: The desired rdata type.
@type rdtype: int
@param rdclass: The desired rdata class; the default is class IN.
@type rdclass: int
@param use_edns: The EDNS level to use; the default is None (no EDNS).
See the description of message.Message.use_edns() for the possible
values for use_edns and their meanings.
@type use_edns: int or bool or None
@param want_dnssec: Should the query indicate that DNSSEC is desired?
@type want_dnssec: bool
@param ednsflags: EDNS flag values.
@type ednsflags: int
@param payload: The EDNS sender's payload field, which is the maximum
size of UDP datagram the sender can handle.
@type payload: int
@param request_payload: The EDNS payload size to use when sending
this message. If not specified, defaults to the value of payload.
@type request_payload: int or None
@param options: The EDNS options
@type options: None or list of edns.Option objects
@see: RFC 2671
@rtype: message.Message object"""
if isinstance(qname, (str, unicode)):
qname = mname.from_text(qname)
if isinstance(rdtype, (str, unicode)):
rdtype = rdatatype.from_text(rdtype)
if isinstance(rdclass, (str, unicode)):
rdclass = rdataclass.from_text(rdclass)
m = Message()
m.flags |= flags.RD
m.find_rrset(m.question,
qname,
rdclass,
rdtype,
create=True,
force_unique=True)
m.use_edns(use_edns, ednsflags, payload, request_payload, options)
m.want_dnssec(want_dnssec)
return m
def _rr_line(self, section):
"""Process one line from the text format answer, authority, or
additional data sections.
"""
deleting = None
# Name
token = self.tok.get(want_leading = True)
if not token.is_whitespace():
self.last_name = mname.from_text(token.value, None)
name = self.last_name
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
# TTL
try:
ttl = int(token.value, 0)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
ttl = 0
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
if rdclass == rdataclass.ANY or rdclass == rdataclass.NONE:
deleting = rdclass
rdclass = self.zone_rdclass
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = rdataclass.IN
# Type
rdtype = rdatatype.from_text(token.value)
token = self.tok.get()
if not token.is_eol_or_eof():
self.tok.unget(token)
rd = rdata.from_text(rdclass, rdtype, self.tok, None)
covers = rd.covers()
else:
rd = None
covers = rdatatype.NONE
rrset = self.message.find_rrset(section, name,
rdclass, rdtype, covers,
deleting, True, self.updating)
if not rd is None:
rrset.add(rd, ttl)
def _rr_line(self, section):
"""Process one line from the text format answer, authority, or
additional data sections.
"""
deleting = None
# Name
token = self.tok.get(want_leading=True)
if not token.is_whitespace():
self.last_name = mname.from_text(token.value, None)
name = self.last_name
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
# TTL
try:
ttl = int(token.value, 0)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
ttl = 0
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
if rdclass == rdataclass.ANY or rdclass == rdataclass.NONE:
deleting = rdclass
rdclass = self.zone_rdclass
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = rdataclass.IN
# Type
rdtype = rdatatype.from_text(token.value)
token = self.tok.get()
if not token.is_eol_or_eof():
self.tok.unget(token)
rd = rdata.from_text(rdclass, rdtype, self.tok, None)
covers = rd.covers()
else:
rd = None
covers = rdatatype.NONE
rrset = self.message.find_rrset(section, name, rdclass, rdtype, covers,
deleting, True, self.updating)
if not rd is None:
rrset.add(rd, ttl)
def make_query(qname, rdtype, rdclass = rdataclass.IN, use_edns=None,
want_dnssec=False, ednsflags=0, payload=1280,
request_payload=None, options=None):
"""Make a query message.
The query name, type, and class may all be specified either
as objects of the appropriate type, or as strings.
The query will have a randomly choosen query id, and its DNS flags
will be set to flags.RD.
@param qname: The query name.
@type qname: mname.Name object or string
@param rdtype: The desired rdata type.
@type rdtype: int
@param rdclass: The desired rdata class; the default is class IN.
@type rdclass: int
@param use_edns: The EDNS level to use; the default is None (no EDNS).
See the description of message.Message.use_edns() for the possible
values for use_edns and their meanings.
@type use_edns: int or bool or None
@param want_dnssec: Should the query indicate that DNSSEC is desired?
@type want_dnssec: bool
@param ednsflags: EDNS flag values.
@type ednsflags: int
@param payload: The EDNS sender's payload field, which is the maximum
size of UDP datagram the sender can handle.
@type payload: int
@param request_payload: The EDNS payload size to use when sending
this message. If not specified, defaults to the value of payload.
@type request_payload: int or None
@param options: The EDNS options
@type options: None or list of edns.Option objects
@see: RFC 2671
@rtype: message.Message object"""
if isinstance(qname, (str, unicode)):
qname = mname.from_text(qname)
if isinstance(rdtype, (str, unicode)):
rdtype = rdatatype.from_text(rdtype)
if isinstance(rdclass, (str, unicode)):
rdclass = rdataclass.from_text(rdclass)
m = Message()
m.flags |= flags.RD
m.find_rrset(m.question, qname, rdclass, rdtype, create=True,
force_unique=True)
m.use_edns(use_edns, ednsflags, payload, request_payload, options)
m.want_dnssec(want_dnssec)
return m
def from_text_list(rdclass, rdtype, ttl, text_rdatas):
"""Create an rdataset with the specified class, type, and TTL, and with
the specified list of rdatas in text format.
@rtype: rdataset.Rdataset object
"""
if isinstance(rdclass, (str, unicode)):
rdclass = rdataclass.from_text(rdclass)
if isinstance(rdtype, (str, unicode)):
rdtype = rdatatype.from_text(rdtype)
r = Rdataset(rdclass, rdtype)
r.update_ttl(ttl)
for t in text_rdatas:
rd = rdata.from_text(r.rdclass, r.rdtype, t)
r.add(rd)
return r
def __init__(self,
zone,
rdclass=rdataclass.IN,
keyring=None,
keyname=None,
keyalgorithm=tsig.default_algorithm):
"""Initialize a new DNS Update object.
@param zone: The zone which is being updated.
@type zone: A name.Name or string
@param rdclass: The class of the zone; defaults to rdataclass.IN.
@type rdclass: An int designating the class, or a string whose value
is the name of a class.
@param keyring: The TSIG keyring to use; defaults to None.
@type keyring: dict
@param keyname: The name of the TSIG key to use; defaults to None.
The key must be defined in the keyring. If a keyring is specified
but a keyname is not, then the key used will be the first key in the
keyring. Note that the order of keys in a dictionary is not defined,
so applications should supply a keyname when a keyring is used, unless
they know the keyring contains only one key.
@type keyname: name.Name or string
@param keyalgorithm: The TSIG algorithm to use; defaults to
tsig.default_algorithm. Constants for TSIG algorithms are defined
in tsig, and the currently implemented algorithms are
HMAC_MD5, HMAC_SHA1, HMAC_SHA224, HMAC_SHA256, HMAC_SHA384, and
HMAC_SHA512.
@type keyalgorithm: string
"""
super(Update, self).__init__()
self.flags |= opcode.to_flags(opcode.UPDATE)
if isinstance(zone, (str, unicode)):
zone = name.from_text(zone)
self.origin = zone
if isinstance(rdclass, str):
rdclass = rdataclass.from_text(rdclass)
self.zone_rdclass = rdclass
self.find_rrset(self.question,
self.origin,
rdclass,
rdatatype.SOA,
create=True,
force_unique=True)
if not keyring is None:
self.use_tsig(keyring, keyname, algorithm=keyalgorithm)
def __init__(self, zone, rdclass=rdataclass.IN, keyring=None,
keyname=None, keyalgorithm=tsig.default_algorithm):
"""Initialize a new DNS Update object.
@param zone: The zone which is being updated.
@type zone: A name.Name or string
@param rdclass: The class of the zone; defaults to rdataclass.IN.
@type rdclass: An int designating the class, or a string whose value
is the name of a class.
@param keyring: The TSIG keyring to use; defaults to None.
@type keyring: dict
@param keyname: The name of the TSIG key to use; defaults to None.
The key must be defined in the keyring. If a keyring is specified
but a keyname is not, then the key used will be the first key in the
keyring. Note that the order of keys in a dictionary is not defined,
so applications should supply a keyname when a keyring is used, unless
they know the keyring contains only one key.
@type keyname: name.Name or string
@param keyalgorithm: The TSIG algorithm to use; defaults to
tsig.default_algorithm. Constants for TSIG algorithms are defined
in tsig, and the currently implemented algorithms are
HMAC_MD5, HMAC_SHA1, HMAC_SHA224, HMAC_SHA256, HMAC_SHA384, and
HMAC_SHA512.
@type keyalgorithm: string
"""
super(Update, self).__init__()
self.flags |= opcode.to_flags(opcode.UPDATE)
if isinstance(zone, (str, unicode)):
zone = name.from_text(zone)
self.origin = zone
if isinstance(rdclass, str):
rdclass = rdataclass.from_text(rdclass)
self.zone_rdclass = rdclass
self.find_rrset(self.question, self.origin, rdclass, rdatatype.SOA,
create=True, force_unique=True)
if not keyring is None:
self.use_tsig(keyring, keyname, algorithm=keyalgorithm)
def query(self, qname, rdtype=rdatatype.A, rdclass=rdataclass.IN,
tcp=False, source=None, raise_on_no_answer=True, source_port=0):
"""Query nameservers to find the answer to the question.
The I{qname}, I{rdtype}, and I{rdclass} parameters may be objects
of the appropriate type, or strings that can be converted into objects
of the appropriate type. E.g. For I{rdtype} the integer 2 and the
the string 'NS' both mean to query for records with DNS rdata type NS.
@param qname: the query name
@type qname: name.Name object or string
@param rdtype: the query type
@type rdtype: int or string
@param rdclass: the query class
@type rdclass: int or string
@param tcp: use TCP to make the query (default is False).
@type tcp: bool
@param source: bind to this IP address (defaults to machine default IP).
@type source: IP address in dotted quad notation
@param raise_on_no_answer: raise NoAnswer if there's no answer
(defaults is True).
@type raise_on_no_answer: bool
@param source_port: The port from which to send the message.
The default is 0.
@type source_port: int
@rtype: resolver.Answer instance
@raises Timeout: no answers could be found in the specified lifetime
@raises NXDOMAIN: the query name does not exist
@raises YXDOMAIN: the query name is too long after DNAME substitution
@raises NoAnswer: the response did not contain an answer and
raise_on_no_answer is True.
@raises NoNameservers: no non-broken nameservers are available to
answer the question."""
#import pdb
#pdb.set_trace()
if isinstance(qname, (str, unicode)):
qname = name.from_text(qname, None)
if isinstance(rdtype, (str, unicode)):
rdtype = rdatatype.from_text(rdtype)
if rdatatype.is_metatype(rdtype):
raise NoMetaqueries
if isinstance(rdclass, (str, unicode)):
rdclass = rdataclass.from_text(rdclass)
if rdataclass.is_metaclass(rdclass):
raise NoMetaqueries
qnames_to_try = []
if qname.is_absolute():
qnames_to_try.append(qname)
else:
if len(qname) > 1:
qnames_to_try.append(qname.concatenate(name.root))
if self.search:
for suffix in self.search:
qnames_to_try.append(qname.concatenate(suffix))
else:
qnames_to_try.append(qname.concatenate(self.domain))
all_nxdomain = True
start = time.time()
for qname in qnames_to_try:
if self.cache:
answer = self.cache.get((qname, rdtype, rdclass))
if not answer is None:
if answer.rrset is None and raise_on_no_answer:
raise NoAnswer
else:
return answer
request = message.make_query(qname, rdtype, rdclass)
if not self.keyname is None:
request.use_tsig(self.keyring, self.keyname,
algorithm=self.keyalgorithm)
request.use_edns(self.edns, self.ednsflags, self.payload)
if self.flags is not None:
request.flags = self.flags
response = None
#
# make a copy of the servers list so we can alter it later.
#
nameservers = self.nameservers[:]
if self.rotate:
random.shuffle(nameservers)
backoff = 0.10
while response is None:
if len(nameservers) == 0:
raise NoNameservers
for nameserver in nameservers[:]:
timeout = self._compute_timeout(start)
try:
if tcp:
response = mquery.tcp(request, nameserver,
timeout, self.port,
source=source,
source_port=source_port)
else:
response = mquery.udp(request, nameserver,
timeout, self.port,
source=source,
source_port=source_port)
if response.flags & flags.TC:
# Response truncated; retry with TCP.
timeout = self._compute_timeout(start)
response = mquery.tcp(request, nameserver,
timeout, self.port,
source=source,
source_port=source_port)
except (socket.error, exception.Timeout):
#
# Communication failure or timeout. Go to the
# next server
#
response = None
continue
except mquery.UnexpectedSource:
#
# Who knows? Keep going.
#
response = None
continue
except exception.FormError:
#
# We don't understand what this server is
# saying. Take it out of the mix and
# continue.
#
nameservers.remove(nameserver)
response = None
continue
except EOFError:
#
# We're using TCP and they hung up on us.
# Probably they don't support TCP (though
# they're supposed to!). Take it out of the
# mix and continue.
#
nameservers.remove(nameserver)
response = None
continue
rcode = response.rcode()
if rcode == mrcode.YXDOMAIN:
raise YXDOMAIN
if rcode == mrcode.NOERROR or \
rcode == mrcode.NXDOMAIN:
break
#
# We got a response, but we're not happy with the
# rcode in it. Remove the server from the mix if
# the rcode isn't SERVFAIL.
#
if rcode != mrcode.SERVFAIL or not self.retry_servfail:
nameservers.remove(nameserver)
response = None
if not response is None:
break
#
# All nameservers failed!
#
if len(nameservers) > 0:
#
# But we still have servers to try. Sleep a bit
# so we don't pound them!
#
timeout = self._compute_timeout(start)
sleep_time = min(timeout, backoff)
backoff *= 2
time.sleep(sleep_time)
if response.rcode() == mrcode.NXDOMAIN:
continue
all_nxdomain = False
break
if all_nxdomain:
raise NXDOMAIN
answer = Answer(qname, rdtype, rdclass, response,
raise_on_no_answer)
if self.cache:
self.cache.put((qname, rdtype, rdclass), answer)
return answer
def _generate_line(self):
# range lhs [ttl] [class] type rhs [ comment ]
"""Process one line containing the GENERATE statement from a DNS
master file."""
if self.current_origin is None:
raise UnknownOrigin
token = self.tok.get()
# Range (required)
try:
start, stop, step = grange.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except:
raise exception.SyntaxError
# lhs (required)
try:
lhs = token.value
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except:
raise exception.SyntaxError
# TTL
try:
ttl = ttl.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except ttl.BadTTL:
ttl = self.ttl
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = self.zone.rdclass
if rdclass != self.zone.rdclass:
raise exception.SyntaxError("RR class is not zone's class")
# Type
try:
rdtype = rdatatype.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except:
raise exception.SyntaxError("unknown rdatatype '%s'" % token.value)
# lhs (required)
try:
rhs = token.value
except:
raise exception.SyntaxError
lmod, lsign, loffset, lwidth, lbase = self._parse_modify(lhs)
rmod, rsign, roffset, rwidth, rbase = self._parse_modify(rhs)
for i in range(start, stop + 1, step):
# +1 because bind is inclusive and python is exclusive
if lsign == '+':
lindex = i + int(loffset)
elif lsign == '-':
lindex = i - int(loffset)
if rsign == '-':
rindex = i - int(roffset)
elif rsign == '+':
rindex = i + int(roffset)
lzfindex = str(lindex).zfill(int(lwidth))
rzfindex = str(rindex).zfill(int(rwidth))
name = lhs.replace('$%s' % (lmod), lzfindex)
rdata = rhs.replace('$%s' % (rmod), rzfindex)
self.last_name = name.from_text(name, self.current_origin)
name = self.last_name
if not name.is_subdomain(self.zone.origin):
self._eat_line()
return
if self.relativize:
name = name.relativize(self.zone.origin)
n = self.zone.nodes.get(name)
if n is None:
n = self.zone.node_factory()
self.zone.nodes[name] = n
try:
rd = rdata.from_text(rdclass, rdtype, rdata,
self.current_origin, False)
except exception.SyntaxError:
# Catch and reraise.
(ty, va) = sys.exc_info()[:2]
raise va
except:
# All exceptions that occur in the processing of rdata
# are treated as syntax errors. This is not strictly
# correct, but it is correct almost all of the time.
# We convert them to syntax errors so that we can emit
# helpful filename:line info.
(ty, va) = sys.exc_info()[:2]
raise exception.SyntaxError("caught exception %s: %s" %
(str(ty), str(va)))
rd.choose_relativity(self.zone.origin, self.relativize)
covers = rd.covers()
rds = n.find_rdataset(rdclass, rdtype, covers, True)
rds.add(rd, ttl)
def _rr_line(self):
"""Process one line from a DNS master file."""
# Name
if self.current_origin is None:
raise UnknownOrigin
token = self.tok.get(want_leading=True)
if not token.is_whitespace():
self.last_name = name.from_text(token.value, self.current_origin)
else:
token = self.tok.get()
if token.is_eol_or_eof():
# treat leading WS followed by EOL/EOF as if they were EOL/EOF.
return
self.tok.unget(token)
name = self.last_name
if not name.is_subdomain(self.zone.origin):
self._eat_line()
return
if self.relativize:
name = name.relativize(self.zone.origin)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
# TTL
try:
ttl = ttl.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except ttl.BadTTL:
ttl = self.ttl
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = self.zone.rdclass
if rdclass != self.zone.rdclass:
raise exception.SyntaxError("RR class is not zone's class")
# Type
try:
rdtype = rdatatype.from_text(token.value)
except:
raise exception.SyntaxError("unknown rdatatype '%s'" % token.value)
n = self.zone.nodes.get(name)
if n is None:
n = self.zone.node_factory()
self.zone.nodes[name] = n
try:
rd = rdata.from_text(rdclass, rdtype, self.tok,
self.current_origin, False)
except exception.SyntaxError:
# Catch and reraise.
(ty, va) = sys.exc_info()[:2]
raise va
except:
# All exceptions that occur in the processing of rdata
# are treated as syntax errors. This is not strictly
# correct, but it is correct almost all of the time.
# We convert them to syntax errors so that we can emit
# helpful filename:line info.
(ty, va) = sys.exc_info()[:2]
raise exception.SyntaxError("caught exception %s: %s" %
(str(ty), str(va)))
rd.choose_relativity(self.zone.origin, self.relativize)
covers = rd.covers()
rds = n.find_rdataset(rdclass, rdtype, covers, True)
rds.add(rd, ttl)
def _generate_line(self):
# range lhs [ttl] [class] type rhs [ comment ]
"""Process one line containing the GENERATE statement from a DNS
master file."""
if self.current_origin is None:
raise UnknownOrigin
token = self.tok.get()
# Range (required)
try:
start, stop, step = grange.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except:
raise exception.SyntaxError
# lhs (required)
try:
lhs = token.value
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except:
raise exception.SyntaxError
# TTL
try:
ttl = ttl.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except ttl.BadTTL:
ttl = self.ttl
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = self.zone.rdclass
if rdclass != self.zone.rdclass:
raise exception.SyntaxError("RR class is not zone's class")
# Type
try:
rdtype = rdatatype.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except:
raise exception.SyntaxError("unknown rdatatype '%s'" %
token.value)
# lhs (required)
try:
rhs = token.value
except:
raise exception.SyntaxError
lmod, lsign, loffset, lwidth, lbase = self._parse_modify(lhs)
rmod, rsign, roffset, rwidth, rbase = self._parse_modify(rhs)
for i in range(start, stop + 1, step):
# +1 because bind is inclusive and python is exclusive
if lsign == '+':
lindex = i + int(loffset)
elif lsign == '-':
lindex = i - int(loffset)
if rsign == '-':
rindex = i - int(roffset)
elif rsign == '+':
rindex = i + int(roffset)
lzfindex = str(lindex).zfill(int(lwidth))
rzfindex = str(rindex).zfill(int(rwidth))
name = lhs.replace('$%s' % (lmod), lzfindex)
rdata = rhs.replace('$%s' % (rmod), rzfindex)
self.last_name = name.from_text(name, self.current_origin)
name = self.last_name
if not name.is_subdomain(self.zone.origin):
self._eat_line()
return
if self.relativize:
name = name.relativize(self.zone.origin)
n = self.zone.nodes.get(name)
if n is None:
n = self.zone.node_factory()
self.zone.nodes[name] = n
try:
rd = rdata.from_text(rdclass, rdtype, rdata,
self.current_origin, False)
except exception.SyntaxError:
# Catch and reraise.
(ty, va) = sys.exc_info()[:2]
raise va
except:
# All exceptions that occur in the processing of rdata
# are treated as syntax errors. This is not strictly
# correct, but it is correct almost all of the time.
# We convert them to syntax errors so that we can emit
# helpful filename:line info.
(ty, va) = sys.exc_info()[:2]
raise exception.SyntaxError("caught exception %s: %s" %
(str(ty), str(va)))
rd.choose_relativity(self.zone.origin, self.relativize)
covers = rd.covers()
rds = n.find_rdataset(rdclass, rdtype, covers, True)
rds.add(rd, ttl)
def _rr_line(self):
"""Process one line from a DNS master file."""
# Name
if self.current_origin is None:
raise UnknownOrigin
token = self.tok.get(want_leading = True)
if not token.is_whitespace():
self.last_name = name.from_text(token.value, self.current_origin)
else:
token = self.tok.get()
if token.is_eol_or_eof():
# treat leading WS followed by EOL/EOF as if they were EOL/EOF.
return
self.tok.unget(token)
name = self.last_name
if not name.is_subdomain(self.zone.origin):
self._eat_line()
return
if self.relativize:
name = name.relativize(self.zone.origin)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
# TTL
try:
ttl = ttl.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except ttl.BadTTL:
ttl = self.ttl
# Class
try:
rdclass = rdataclass.from_text(token.value)
token = self.tok.get()
if not token.is_identifier():
raise exception.SyntaxError
except exception.SyntaxError:
raise exception.SyntaxError
except:
rdclass = self.zone.rdclass
if rdclass != self.zone.rdclass:
raise exception.SyntaxError("RR class is not zone's class")
# Type
try:
rdtype = rdatatype.from_text(token.value)
except:
raise exception.SyntaxError("unknown rdatatype '%s'" % token.value)
n = self.zone.nodes.get(name)
if n is None:
n = self.zone.node_factory()
self.zone.nodes[name] = n
try:
rd = rdata.from_text(rdclass, rdtype, self.tok,
self.current_origin, False)
except exception.SyntaxError:
# Catch and reraise.
(ty, va) = sys.exc_info()[:2]
raise va
except:
# All exceptions that occur in the processing of rdata
# are treated as syntax errors. This is not strictly
# correct, but it is correct almost all of the time.
# We convert them to syntax errors so that we can emit
# helpful filename:line info.
(ty, va) = sys.exc_info()[:2]
raise exception.SyntaxError("caught exception %s: %s" % (str(ty), str(va)))
rd.choose_relativity(self.zone.origin, self.relativize)
covers = rd.covers()
rds = n.find_rdataset(rdclass, rdtype, covers, True)
rds.add(rd, ttl)