Your IP : 3.138.174.235
�
w�Qc @ s� d Z d d l Z d d l Z d d l Z d d l Z d d l Z d d l Z d Z d Z d Z
d Z d e f d � � YZ
d S( s* Help for building DNS wire format messagesi����Ni i i i t Rendererc B s� e Z d Z d
d d d
d � Z d � Z d � Z e j j d � Z
d � Z d � Z d
d � Z
e j j d
� Z d � Z d � Z RS( st Helper class for building DNS wire-format messages.
Most applications can use the higher-level L{dns.message.Message}
class and its to_wire() method to generate wire-format messages.
This class is for those applications which need finer control
over the generation of messages.
Typical use::
r = dns.renderer.Renderer(id=1, flags=0x80, max_size=512)
r.add_question(qname, qtype, qclass)
r.add_rrset(dns.renderer.ANSWER, rrset_1)
r.add_rrset(dns.renderer.ANSWER, rrset_2)
r.add_rrset(dns.renderer.AUTHORITY, ns_rrset)
r.add_edns(0, 0, 4096)
r.add_rrset(dns.renderer.ADDTIONAL, ad_rrset_1)
r.add_rrset(dns.renderer.ADDTIONAL, ad_rrset_2)
r.write_header()
r.add_tsig(keyname, secret, 300, 1, 0, '', request_mac)
wire = r.get_wire()
@ivar output: where rendering is written
@type output: cStringIO.StringIO object
@ivar id: the message id
@type id: int
@ivar flags: the message flags
@type flags: int
@ivar max_size: the maximum size of the message
@type max_size: int
@ivar origin: the origin to use when rendering relative names
@type origin: dns.name.Name object
@ivar compress: the compression table
@type compress: dict
@ivar section: the section currently being rendered
@type section: int (dns.renderer.QUESTION, dns.renderer.ANSWER,
dns.renderer.AUTHORITY, or dns.renderer.ADDITIONAL)
@ivar counts: list of the number of RRs in each section
@type counts: int list of length 4
@ivar mac: the MAC of the rendered message (if TSIG was used)
@type mac: string
i i�� c C s� t j � | _ | d k r3 t j d d � | _ n | | _ | | _ | | _ | | _ i | _
t | _ d d d d g | _
| j j d � d | _ d S( s� Initialize a new renderer.
@param id: the message id
@type id: int
@param flags: the DNS message flags
@type flags: int
@param max_size: the maximum message size; the default is 65535.
If rendering results in a message greater than I{max_size},
then L{dns.exception.TooBig} will be raised.
@type max_size: int
@param origin: the origin to use when rendering relative names
@type origin: dns.name.Namem or None.
i i�� t i t Nt ( t cStringIOt StringIOt outputt Nonet randomt randintt idt flagst max_sizet origint compresst QUESTIONt sectiont countst writet mac( t selfR
R R R
( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt __init__J s c C s~ | j j | � | j j � g } x9 | j j � D]( \ } } | | k r3 | j | � q3 q3 Wx | D] } | j | =qf Wd S( s� Truncate the output buffer at offset I{where}, and remove any
compression table entries that pointed beyond the truncation
point.
@param where: the offset
@type where: int
N( R t seekt truncateR t iteritemst append( R t wheret keys_to_deletet kt v( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt _rollbackg s
c C s= | j | k r9 | j | k r- t j j � n | | _ n d S( sZ Set the renderer's current section.
Sections must be rendered order: QUESTION, ANSWER, AUTHORITY,
ADDITIONAL. Sections may be empty.
@param section: the section
@type section: int
@raises dns.exception.FormError: an attempt was made to set
a section value less than the current section.
N( R t dnst exceptiont FormError( R R ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt _set_sectiony s c C s� | j t � | j j � } | j | j | j | j � | j j t j d | | � � | j j � } | | j
k r� | j | � t j
j � n | j t c d 7<d S( s Add a question to the message.
@param qname: the question name
@type qname: dns.name.Name
@param rdtype: the question rdata type
@type rdtype: int
@param rdclass: the question rdata class
@type rdclass: int
s !HHi N( R" R R t tellt to_wireR R
R t structt packR R R R t TooBigR ( R t qnamet rdtypet rdclasst beforet after( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt add_question� s
c K s� | j | � | j j � } | j | j | j | j | � } | j j � } | | j k rw | j | � t j j
� n | j | c | 7<d S( s Add the rrset to the specified section.
Any keyword arguments are passed on to the rdataset's to_wire()
routine.
@param section: the section
@type section: int
@param rrset: the rrset
@type rrset: dns.rrset.RRset object
N( R" R R# R$ R R
R R R R R' R ( R R t rrsett kwR+ t nR, ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt add_rrset� s
!
c K s� | j | � | j j � } | j | | j | j | j | � } | j j � } | | j k rz | j | � t j j
� n | j | c | 7<d S( s� Add the rdataset to the specified section, using the specified
name as the owner name.
Any keyword arguments are passed on to the rdataset's to_wire()
routine.
@param section: the section
@type section: int
@param name: the owner name
@type name: dns.name.Name object
@param rdataset: the rdataset
@type rdataset: dns.rdataset.Rdataset object
N( R" R R# R$ R R
R R R R R' R ( R R t namet rdatasetR/ R+ R0 R, ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt add_rdataset� s
c
C s� | d M} | | d >O} | j t � | j j � } | j j t j d d t j j | | d � � | d k r�| j j � } x� | D]� } t j d | j d � } | j j | � | j j � } | j | j � | j j � }
| j j
| d � t j d |
| � } | j j | � | j j
d d � q� W| j j � } | j j
| d � t j d | | � } | j j | � | j j
d d � n | j j � } | | j k r�| j | � t j j � n | j t c d 7<d S(
s� Add an EDNS OPT record to the message.
@param edns: The EDNS level to use.
@type edns: int
@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 options: The EDNS options list
@type options: list of dns.edns.Option instances
@see: RFC 2671
l �~ i s !BHHIHi s !HHi s !Hi N( R" t
ADDITIONALR R# R R% R& R t rdatatypet OPTR t otypeR$ R R R R R' R (
R t ednst ednsflagst payloadt optionsR+ t lstartt optt stufft startt endt lendR, ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt add_edns� s8
!
c C s� | j t � | j j � } | j j � }
t j j |
| | t t j � � | | | | | d | � \ } | _
} | j | j | j | j
� | j j t j d t j j t j j d d � � | j j � }
| j j | � | j j � } | | j k r| j | � t j j � n | j j |
d � | j j t j d | |
� � | j t c d 7<| j j d � | j j t j d | j t � � | j j d d � d S( s� Add a TSIG signature to the message.
@param keyname: the TSIG key name
@type keyname: dns.name.Name object
@param secret: the secret to use
@type secret: string
@param fudge: TSIG time fudge
@type fudge: int
@param id: the message id to encode in the tsig signature
@type id: int
@param tsig_error: TSIG error code; default is 0.
@type tsig_error: int
@param other_data: TSIG other data.
@type other_data: string
@param request_mac: This message is a response to the request which
had the specified MAC.
@type request_mac: string
@param algorithm: the TSIG algorithm to use
@type algorithm: dns.name.Name object
t algorithms !HHIHi i s !Hi i
N( R" R5 R R# t getvalueR t tsigt signt intt timeR R$ R R
R R% R& R6 t TSIGt
rdataclasst ANYR R R R' R R ( R t keynamet secrett fudgeR
t
tsig_errort
other_datat request_macRD R+ t st
tsig_rdatat ctxt rdata_startR, ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt add_tsig� s8
#c
C st | j j d � | j j t j d | j | j | j d | j d | j d | j d � � | j j d d � d S( s� Write the DNS message header.
Writing the DNS message header is done after all sections
have been rendered, but before the optional TSIG signature
is added.
i s !HHHHHHi i i N( R R R R% R& R
R R ( R ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt write_header1 s
c C s
| j j � S( s@ Return the wire format message.
@rtype: string
( R RE ( R ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt get_wire? s N( t __name__t
__module__t __doc__R R R R" R RK t INR- R1 R4 RC RF t default_algorithmRW RX RY ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyR s ) 04 ( R\ R R% R RI t
dns.exceptionR t dns.tsigR t ANSWERt AUTHORITYR5 t objectR ( ( ( s2 /usr/lib64/python2.7/site-packages/dns/renderer.pyt <module> s