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BadDomainNamec C s t �| d| � d S )Ns at position %s)� Exception�__init__)�self�posr% r% r& r6 � s zBadDomainName.__init__N)r, r- r. r6 r% r% r% r& r4 � s r4 c @ r) )�BadDomainNameCircularNr+ r% r% r% r& r9 � r/ r9 c @ �@ e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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zDNSQuestion.__init__c C s. | j |j ko| j|jkp| jtko| j|jkS )z6Returns true if the question is answered by the record)rA r? � _TYPE_ANYr> )r7 �recr% r% r& �
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�zDNSQuestion.answeredByc C s t �| dd�S )�String representations questionN)r; r[ �r7 r% r% r& �__repr__7 � zDNSQuestion.__repr__N)r, r- r. r\ r6 re rh r% r% r% r& r] % s
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dd� ZdS )� DNSRecordz.A DNS record - like a DNS entry, but has a TTLc C s" t �| |||� || _t� | _d S �N)r; r6 �ttlr' �created)r7 r> r? rA rl r% r% r& r6 ? s zDNSRecord.__init__c C s t |t�r t�| |�S dS )z Tests equality as per DNSRecordr )rE rj r; rH rF r% r% r& rH D �
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information held in this record.r r )�answers�suppressedByAnswer)r7 �msg�recordr% r% r& � suppressedByJ s
�zDNSRecord.suppressedByc C s | |kr|j | j d krdS dS )zwReturns true if another record has same name, type and class,
and if its TTL is at least half of this record's.r r r )rl rF r% r% r& rp R s z DNSRecord.suppressedByAnswerc C s | j || j d S )zXReturns the time at which this record will have expired
by a certain percentage.r �rm rl )r7 �percentr% r% r& �getExpirationTimeY s zDNSRecord.getExpirationTimec C s t d| �d�| d �S )z%Returns the remaining TTL in seconds.r �d r# )�maxrv �r7 �nowr% r% r& �getRemainingTTL^ � zDNSRecord.getRemainingTTLc C � | � d�|kS )z(Returns true if this record has expired.rw �rv ry r% r% r& � isExpiredb ri zDNSRecord.isExpiredc C r} )z9Returns true if this record is at least half way expired.�2 r~ ry r% r% r& �isStalef ri zDNSRecord.isStalec C s |j | _ |j| _dS )zJSets this record's TTL and created time to that of
another record.Nrt rF r% r% r& �resetTTLj s zDNSRecord.resetTTLc C s t �)zAbstract method)r2 �r7 �outr% r% r& �writep s zDNSRecord.writec C s& d| j | �t� �|f }t�| d|�S )rV s %s/%s,%ss record)rl r{ r' r; r[ )r7 rG �argr% r% r& r[ t s
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DNSAddresszA DNS address recordc C � t �| ||||� || _d S rk )rj r6 �address)r7 r> r? rA rl r� r% r% r& r6 � �
zDNSAddress.__init__c C � |� | jt| j�� dS �z'Used in constructing an outgoing packetN)� writeStringr� �lenr� r% r% r& r� � r| zDNSAddress.writec C � t |t�r | j|jkS dS )zTests equality on addressr )rE r� r� rF r% r% r& rH � rn zDNSAddress.__eq__c C s( zt �| j�W S ty | j Y S w �rf )�socket� inet_ntoar� r5 rg r% r% r& rh � s
�zDNSAddress.__repr__N�r, r- r. r\ r6 r� rH rh r% r% r% r& r� ~ � r� c @ r� ) �DNSHinfoz A DNS host information recordc C s" t �| ||||� || _|| _d S rk )rj r6 �cpu�os)r7 r> r? rA rl r� r� r% r% r& r6 � s
zDNSHinfo.__init__c C s, |� | jt| j�� |� | jt| j�� dS r� )r� r� r� r� r� r% r% r& r� � s zDNSHinfo.writec C s& t |t�r| j|jko| j|jkS dS )z Tests equality on cpu and osr )rE r� r� r� rF r% r% r& rH � s
zDNSHinfo.__eq__c C s | j d | j S )rf � )r� r� rg r% r% r& rh � � zDNSHinfo.__repr__Nr� r% r% r% r& r� � s r� c @ r� ) �
DNSPointerzA DNS pointer recordc C r� rk )rj r6 �alias)r7 r> r? rA rl r� r% r% r& r6 � r� zDNSPointer.__init__c C s |� | j� dS r� )� writeNamer� r� r% r% r& r� � r� zDNSPointer.writec C r� )zTests equality on aliasr )rE r� r� rF r% r% r& rH � rn zDNSPointer.__eq__c C s | � | j�S r� )r[ r� rg r% r% r& rh � r( zDNSPointer.__repr__Nr� r% r% r% r& r� � r� r� c @ r� ) �DNSTextzA DNS text recordc C r� rk )rj r6 �text)r7 r> r? rA rl r� r% r% r& r6 � r� zDNSText.__init__c C r� r� )r� r� r� r� r% r% r& r� � r| z
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DNSServicezA DNS service recordc C s. t �| ||||� || _|| _|| _|| _d S rk )rj r6 �priority�weight�port�server) r7 r> r? rA rl r� r� r� r� r% r% r& r6 � s
zDNSService.__init__c C s4 |� | j� |� | j� |� | j� |�| j� dS r� )�
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�zDNSService.__eq__c C s | � d| j| jf �S )rf s %s:%s)r[ r� r� rg r% r% r& rh � s zDNSService.__repr__Nr� r% r% r% r& r� � s r� c @ sp e Zd ZdZdd� Zdd� Zdd� Zdd � Zd
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dd� Zdd� ZdS )� DNSIncomingz/Object representation of an incoming DNS packetc C sL d| _ || _g | _g | _d| _d| _d| _d| _| �� | � � | �
� dS )z/Constructor from string holding bytes of packetr N) �offset�data� questionsro � numquestions�
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readOthers)r7 r� r% r% r& r6 s zDNSIncoming.__init__c C sz d}t �|�}t �|| j| j| j| � �}| j|7 _|d | _|d | _|d | _|d | _|d | _ |d | _
dS ) z Reads header portion of packets !HHHHHHr r r r r r N) �struct�calcsize�unpackr� r� �id�flagsr� r� r� r� �r7 �format�length�infor% r% r& r� s
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zDNSIncoming.readHeaderc C s� d}t �|�}td| j�D ]7}| �� }t �|| j| j| j| � �}| j|7 _zt||d |d �}| j �
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w dS )z!Reads questions section of packets !HHr r N) r� r� �ranger� �readNamer� r� r� r] r� �appendr* )r7 r� r� �ir> r� �questionr% r% r& r� ! s
� ��zDNSIncoming.readQuestionsc C �B d}t �|�}t �|| j| j| j| � �}| j|7 _|d S )z Reads an integer from the packet� !Ir �r� r� r� r� r� r� r% r% r& �readInt2 �
�zDNSIncoming.readIntc C s( t | j| j �}| jd7 _| �|�S )z(Reads a character string from the packetr )�ordr� r� �
readString)r7 r� r% r% r& �readCharacterString< s
z DNSIncoming.readCharacterStringc C sF d| }t �|�}t �|| j| j| j| � �}| j|7 _|d S )z0Reads a string of a given length from the packets !%dsr r� )r7 r� r� r� r� r% r% r& r� B s
�zDNSIncoming.readStringc C r� )z'Reads an unsigned short from the packet� !Hr r� r� r% r% r& �readUnsignedShortL r� z DNSIncoming.readUnsignedShortc C s� d}t �|�}| j| j | j }td|�D ]�}| �� }t �|| j| j | j | � �}| j |7 _ d}|d t
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ksW|d tkrht||d |d |d | �� �}nu|d tkr�t||d |d |d | � |d ��}n[|d tkr�t||d |d |d | �� | �� | �� | �� �}n;|d tkr�t||d |d |d | �� | �� �}n!|d tkr�t ||d |d |d | � d��}n | j |d 7 _ |dur�| j�|� qdS ) z@Reads answers, authorities and additionals section of the packets !HHiHr Nr r r r r )r� r� r� r� r� r� r� r� r� r� �_TYPE_Ar� r� � _TYPE_CNAME� _TYPE_PTRr� � _TYPE_TXTr� � _TYPE_SRVr� r� � _TYPE_HINFOr� r� �
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isResponse� ri zDNSIncoming.isResponsec C s | j ||| � �d�S )z6Reads a UTF-8 string of a given length from the packet�utf-8)r� �decode)r7 r� r� r% r% r& �readUTF� r| zDNSIncoming.readUTFc C s� d}| j }d}|} t| j||d � �}|d7 }|dkr nG|d@ }|dkr8d�|| �||�d f�}||7 }n,|dkr`|dk rD|d }|d@ d > t| j||d � �B }||kr]t|��|}nt|��q
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"��zDNSIncoming.readNameN)r, r- r. r\ r6 r� r� r� r� r� r� r� r� r� r� r� r% r% r% r& r� � s
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dd� Zdd� Zdd � Zd d � Zd d � Zd!d"� Zd#S )%� DNSOutgoingz+Object representation of an outgoing packetr c C sF d| _ d| _|| _|| _i | _g | _d| _g | _g | _g | _ g | _
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zDNSOutgoing.__init__c C � | j �|� dS )zAdds a questionN)r� r� �r7 rr r% r% r& � addQuestion� r� zDNSOutgoing.addQuestionc C s |� |�s
| �|d� dS dS )zAdds an answerr N)rs �addAnswerAtTime)r7 �inprr r% r% r& � addAnswer� s
�zDNSOutgoing.addAnswerc C s6 |dur|dks
|� |�s| j�||f� dS dS dS )z6Adds an answer if if does not expire by a certain timeNr )r ro r� )r7 rr rz r% r% r& r� � s
�zDNSOutgoing.addAnswerAtTimec C r� )z Adds an authoritative answerN)r� r� r� r% r% r& �addAuthoritativeAnswer� r� z"DNSOutgoing.addAuthoritativeAnswerc C r� )zAdds an additional answerN)r� r� r� r% r% r& �addAdditionalAnswer� r� z DNSOutgoing.addAdditionalAnswerc C �. d}| j �t�|t|��� | jd7 _dS )z"Writes a single byte to the packet� !cr N)r� r� r� �pack�chrr� �r7 �valuer� r% r% r& � writeByte� � zDNSOutgoing.writeBytec C s, d}| j �|t�||�� | jd7 _dS )z=Inserts an unsigned short in a certain position in the packetr� r N)r� �insertr� r� r� )r7 �indexr� r� r% r% r& � insertShort� s zDNSOutgoing.insertShortc C s* d}| j �t�||�� | jd7 _dS )z&Writes an unsigned short to the packetr� r N)r� r� r� r� r� r� r% r% r& r� � s zDNSOutgoing.writeShortc C r� )z(Writes an unsigned integer to the packetr� r N)r� r� r� r� �intr� r� r% r% r& �writeInt� r� zDNSOutgoing.writeIntc C s6 dt |� d }| j�t�||�� | j|7 _dS )z Writes a string to the packet�!�sN)r` r� r� r� r� r� )r7 r� r� r� r% r% r& r� s zDNSOutgoing.writeStringc C s8 |� d�}t|�}|dkrt�| �|� | �||� dS )z5Writes a UTF-8 string of a given length to the packetr� r N)ra r� r1 r� r� )r7 r �utfstrr� r% r% r& �writeUTF s
zDNSOutgoing.writeUTFc C s� z| j | }W n0 ty7 | j| j |< |�d�}|d dkr%|dd� }|D ]}| �|� q'| �d� Y dS w | �|d? dB � | �|� dS )z"Writes a domain name to the packet� .r� � Nr r r� )r� rP r� �splitr r� )r7 r> r� �parts�partr% r% r& r� s
�zDNSOutgoing.writeNamec C s( | � |j� | �|j� | �|j� dS )z Writes a question to the packetN)r� r> r� r? rA )r7 r� r% r% r& �
writeQuestion, s zDNSOutgoing.writeQuestionc C s� | � |j� | �|j� |jr| jr| �|jtB � n| �|j� |dkr,| �|j � n| �|�
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the packetr r r N)r� r> r� r? rC r� rA rB r rl r{ r� r� r� r� r� r� )r7 rr rz r� r� r% r% r& � writeRecord2 s
zDNSOutgoing.writeRecordc C s� | j ssd| _ | jD ]}| �|� q | jD ]
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No further parts should be added to the packet once this
is done.r r r )r� r� r ro r r� r� r� r� r� r� r� r� r� )r7 r� �answer�time_� authority�
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zDNSOutgoing.packetN)r )r, r- r. r\ r6 r� r� r� r� r� r� r� r� r r� r r� r r r r% r% r% r& r� � s$
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dS )�DNSCachezA cache of DNS entriesc C s
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zDNSCache.__init__c C sB z| j |j }W n ty g }| j |j< Y nw |�|� dS )z
Adds an entryN)r r= rP r� �r7 �entry�listr% r% r& �addk s �z DNSCache.addc C s2 z| j |j }|�|� W dS ty Y dS w )zRemoves an entryN)r r= �removerP r r% r% r& r s s �zDNSCache.removec C s6 z| j |j }||�|� W S ttfy Y dS w )zNGets an entry by key. Will return None if there is no
matching entry.N)r r= r� rP �
ValueErrorr r% r% r& �get{ s �z DNSCache.getc C s t |||�}| �|�S )zRGets an entry by details. Will return None if there is
no matching entry.)r; r )r7 r> r? rA r r% r% r& � getByDetails� s
zDNSCache.getByDetailsc C s$ z| j | W S ty g Y S w )z5Returns a list of entries whose key matches the name.)r rP )r7 r> r% r% r& �entriesWithName� s
�zDNSCache.entriesWithNamec C s0 z t tj�| j�� ��W S ty g Y S w )z Returns a list of all entries)r � itertools�chain�
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�zDNSCache.entriesN) r, r- r. r\ r6 r r r r r r! r% r% r% r& r e s r c @ r: )�Engineac An engine wraps read access to sockets, allowing objects that
need to receive data from sockets to be called back when the
sockets are ready.
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it is interested in is ready for reading.
Writers are not implemented here, because we only send short
packets.
c C s4 t j�| � || _i | _d| _t �� | _| �� d S )Nr ) � threading�Threadr6 �zeroconf�readers�timeout� Condition� condition�start�r7 r% r% r% r& r6 � s
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