/usr/lib/python3.9/site-packages/dns/__pycache__
Edit: /usr/lib/python3.9/site-packages/dns/__pycache__/renderer.cpython-39.pyc (9841B)
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z*Help for building DNS wire format messagesé Né é é c c s” | d| ¡ | ¡ }d V | ¡ }|| }|dkrzN| || ¡ z| | |d¡¡ W n tyt tjj‚Y n0 W | |¡ n | |¡ 0 d S )Nó r Zbig)ÚwriteÚtellÚseekÚto_bytesÚ
OverflowErrorÚdnsÚ exceptionÚ FormError)ÚoutputZ
length_lengthÚstartÚendÚlength© r ú0/usr/lib/python3.9/site-packages/dns/renderer.pyÚprefixed_length# s r c @ sÐ e Zd ZdZd)dd„Zdd„ Zd d
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fdd„Zdd„ Zdd„ Zd*dd„Zd+dd„Ze jjfdd„Ze jjfdd „Zd d „ Zd d „ Zd!d"„ Zedd#œd$d%„Zdd&œd'd(„Z dS ),ÚRendereraš Helper class for building DNS wire-format messages.
Most applications can use the higher-level L{dns.message.Message}
class and its to_wire() method to generate wire-format messages.
This class is for those applications which need finer control
over the generation of messages.
Typical use::
r = dns.renderer.Renderer(id=1, flags=0x80, max_size=512)
r.add_question(qname, qtype, qclass)
r.add_rrset(dns.renderer.ANSWER, rrset_1)
r.add_rrset(dns.renderer.ANSWER, rrset_2)
r.add_rrset(dns.renderer.AUTHORITY, ns_rrset)
r.add_rrset(dns.renderer.ADDITIONAL, ad_rrset_1)
r.add_rrset(dns.renderer.ADDITIONAL, ad_rrset_2)
r.add_edns(0, 0, 4096)
r.write_header()
r.add_tsig(keyname, secret, 300, 1, 0, '', request_mac)
wire = r.get_wire()
If padding is going to be used, then the OPT record MUST be
written after everything else in the additional section except for
the TSIG (if any).
output, an io.BytesIO, where rendering is written
id: the message id
flags: the message flags
max_size: the maximum size of the message
origin: the origin to use when rendering relative names
compress: the compression table
section: an int, the section currently being rendered
counts: list of the number of RRs in each section
mac: the MAC of the rendered message (if TSIG was used)
Nr éÿÿ c C sr t ¡ | _|du r"t dd¡| _n|| _|| _|| _|| _i | _ t
| _ g d¢| _ | j
d¡ d| _d| _d| _dS )zInitialize a new renderer.Nr r )r r r r s Ú F)ÚioÚBytesIOr ÚrandomZrandintÚidÚflagsÚmax_sizeÚoriginÚcompressÚQUESTIONÚsectionÚcountsr ZmacÚreservedÚ
was_padded)Úselfr r r r r r r Ú__init__b s
zRenderer.__init__c C sV | j |¡ | j ¡ g }| j ¡ D ]\}}||kr$| |¡ q$|D ] }| j|= qDdS )z™Truncate the output buffer at offset *where*, and remove any
compression table entries that pointed beyond the truncation
point.
N)r r Útruncater ÚitemsÚappend)r% ÚwhereZkeys_to_deleteÚkÚvr r r Ú _rollbacku s
zRenderer._rollbackc C s& | j |kr"| j |kr tjj‚|| _ dS )a Set the renderer's current section.
Sections must be rendered order: QUESTION, ANSWER, AUTHORITY,
ADDITIONAL. Sections may be empty.
Raises dns.exception.FormError if an attempt was made to set
a section value less than the current section.
N)r! r r r
)r% r! r r r Ú _set_section„ s
zRenderer._set_sectionc c s6 | j ¡ }|V | j ¡ | jkr2| |¡ tjj‚d S ©N)r r r r- r r ZTooBig)r% r r r r Ú _track_size“ s
zRenderer._track_sizec c s@ | j ¡ }z"| j |¡ d V W | j |¡ n| j |¡ 0 d S r/ )r r r )r% r* Úcurrentr r r Ú_temporarily_seek_to› s
z Renderer._temporarily_seek_toc C sr | t¡ | ¡ : | | j| j| j¡ | j t d||¡¡ W d ƒ n1 sR0 Y | j
t d7 < dS )z Add a question to the message.z!HHNr ) r. r r0 Úto_wirer r r r ÚstructÚpackr" )r% ZqnameZrdtypeÚrdclassr r r Ú add_question¤ s
4zRenderer.add_questionc K sd | |¡ | ¡ , |j| j| j| jfi |¤Ž}W d ƒ n1 sD0 Y | j| |7 < dS )zŠAdd the rrset to the specified section.
Any keyword arguments are passed on to the rdataset's to_wire()
routine.
N©r. r0 r3 r r r r" )r% r! ZrrsetÚkwÚnr r r Ú add_rrset s
:zRenderer.add_rrsetc K sf | |¡ | ¡ . |j|| j| j| jfi |¤Ž}W d ƒ n1 sF0 Y | j| |7 < dS )zÁAdd 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.
Nr8 )r% r! ÚnameZrdatasetr9 r: r r r Ú add_rdataset¹ s
<zRenderer.add_rdatasetc
C sœ |rŒ|j }|dksJ ‚|d }| j ¡ | | }|| }|rJd|| }nd}t|jƒ} | tj tjj j
|¡¡ tj j
||j| ¡}d| _| t|¡ dS )aM Add *opt* to the additional section, applying padding if desired. The
padding will take the specified precomputed OPT size and TSIG size into
account.
Note that we don't have reliable way of knowing how big a GSS-TSIG digest
might be, so we we might not get an even multiple of the pad in that case.é r r ó TN)Úttlr r ÚlistÚoptionsr) r ÚednsZ
GenericOptionZ
OptionTypeZPADDINGÚmessageÚMessageÚ _make_optr6 r$ r; Ú
ADDITIONAL)
r% ÚoptZpadZopt_sizeZ tsig_sizer@ Z opt_rdataZsize_without_paddingZ remainderrB r r r Úadd_optÆ s
zRenderer.add_optc C s4 |dM }||d> O }t jj |||¡}| |¡ dS )z&Add an EDNS OPT record to the message.l ÿ~ é N)r rD rE rF rI )r% rC Z ednsflagsZpayloadrB rH r r r Úadd_ednsÝ s zRenderer.add_ednsc
C s~ | j ¡ } t|tjjƒr |}
ntj |||¡}
tjj ||d|d|||¡} tj | |
| d t
t ¡ ƒ|¡\} } | | |¡ dS )z$Add a TSIG signature to the message.r r? N©
r ÚgetvalueÚ
isinstancer ÚtsigZKeyrD rE Z
_make_tsigÚsignÚintÚtimeÚ _write_tsig)
r% ÚkeynameÚsecretÚfudger Ú
tsig_errorÚ
other_dataÚ request_macÚ algorithmÚsÚkeyrO Ú_r r r Úadd_tsigæ s
ÿ$zRenderer.add_tsigc
C s‚ | j ¡ }
t|tjjƒr |} ntj ||| ¡} tjj || d|d|||¡} tj |
| | d t
t ¡ ƒ||d¡\} }| | |¡ |S )ay Add a TSIG signature to the message. Unlike add_tsig(), this can be
used for a series of consecutive DNS envelopes, e.g. for a zone
transfer over TCP [RFC2845, 4.4].
For the first message in the sequence, give ctx=None. For each
subsequent message, give the ctx that was returned from the
add_multi_tsig() call for the previous message.r r? TrL )
r% ÚctxrT rU rV r rW rX rY rZ r[ r\ rO r r r Úadd_multi_tsigÿ s
ÿÿ zRenderer.add_multi_tsigc C s | j r d }n| j}| t¡ | ¡ z | | j|| j¡ | j t
dt j j
t jjd¡¡ t| jdƒ | | j¡ W d ƒ n1 s†0 Y W d ƒ n1 s¤0 Y | jt d7 < | d¡* | j t
d| jt ¡¡ W d ƒ n1 sú0 Y d S )Nz!HHIr r r é
z!H)r$ r r. rG r0 r3 r r r r4 r5 r Z rdatatypeZTSIGÚ
rdataclassÚANYr r" r2 )r% rO rT r r r r rS " s
ÿH zRenderer._write_tsigc
C sh | d¡J | j t d| j| j| jd | jd | jd | jd ¡¡ W d ƒ n1 sZ0 Y dS )z¾Write 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.
r z!HHHHHHr r r N)r2 r r r4 r5 r r r" ©r% r r r Ú write_header4 s ùÿzRenderer.write_headerc C s
| j ¡ S )z Return the wire format message.)r rM rd r r r Úget_wireI s zRenderer.get_wire)ÚsizeÚreturnc C sB |dk rt dƒ‚|| jkr"t dƒ‚| j|7 _| j|8 _dS )zReserve *size* bytes.r z$reserved amount must be non-negativez)cannot reserve more than the maximum sizeN)Ú
ValueErrorr r# )r% rg r r r ÚreserveN s
zRenderer.reserve)rh c C s | j | j7 _ d| _dS )zRelease the reserved bytes.r N)r r# rd r r r Úrelease_reservedW s zRenderer.release_reserved)Nr r N)r r r )N) Ú__name__Ú
__module__Ú __qualname__Ú__doc__r& r- r. Ú
contextlibÚcontextmanagerr0 r2 r rb ÚINr7 r; r= rI rK rO Zdefault_algorithmr^ r` rS re rf rQ rj rk r r r r r 5 s, ,
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dns.exceptionr Zdns.tsigr ZANSWERZ AUTHORITYrG rq r r r r r r Ú
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