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편집 파일: ephemeral.cpython-39.pyc
a '�Dg V � @ s� d Z ddlZddlZddlmZ ddlmZmZmZm Z m Z m Z m Z ddl mZ ddlmZ ddlmZmZ ddlmZ ddlmZmZ e�e�ZG dd � d �Z G d d � d �Z G d d � d �Z G dd� d�Z e ee ef e e d�dd�Z!dS )z.Module for ephemeral network context managers � N)�partial)�Any�Callable�Dict�List�Literal�Optional�Tuple)�NoDHCPLeaseError� maybe_perform_dhcp_discovery)�ProcessExecutionError)�UrlError� wait_for_urlc @ sH e Zd ZdZded�dd�Zdd� Zdd � Zd d � Zd d � Z dd� Z dS )�EphemeralIPv4Networka� Context manager which sets up temporary static network configuration. No operations are performed if the provided interface already has the specified configuration. This can be verified with the connectivity_urls_data. If unconnected, bring up the interface with valid ip, prefix and broadcast. If router is provided setup a default route for that interface. Upon context exit, clean up the interface leaving no configuration behind. N)�interface_addrs_before_dhcpc C s� t ||||g�s$td�||||���zt�|�| _W n4 tyh } z td�| ��| �W Y d} ~ n d} ~ 0 0 || _|| _|| _|| _ || _ g | _ || _ | j� d| j� �| _ |�| ji �| _dS )a� Setup context manager and validate call signature. @param interface: Name of the network interface to bring up. @param ip: IP address to assign to the interface. @param prefix_or_mask: Either netmask of the format X.X.X.X or an int prefix. @param broadcast: Broadcast address for the IPv4 network. @param router: Optionally the default gateway IP. @param static_routes: Optionally a list of static routes from DHCP z5Cannot init network on {0} with {1}/{2} and bcast {3}z4Cannot setup network, invalid prefix or netmask: {0}N�/)�all� ValueError�format�netZipv4_mask_to_net_prefix�prefix� interface�ip� broadcast�router� static_routes� cleanup_cmds�distro�cidr�getr ) �selfr r r �prefix_or_maskr r r r �e� r# �;/usr/lib/python3.9/site-packages/cloudinit/net/ephemeral.py�__init__ s6 ������z EphemeralIPv4Network.__init__c C s� zrz | � � W nB tyP } z*dt|j�vr<dt|j�vr<� W Y d}~n d}~0 0 | jrb| �� n| jrp| �� W n" ty� | �ddd� � Y n0 dS )z�Set up ephemeral network if interface is not connected. This context manager handles the lifecycle of the network interface, addresses, routes, etc z File existszAddress already assignedN) �_bringup_devicer �str�stderrr �_bringup_static_routesr �_bringup_router�__exit__)r r" r# r# r$ � __enter__N s" � � z EphemeralIPv4Network.__enter__c C s | j D ] }|� qdS )z Teardown anything we set up.N)r )r � excp_type� excp_value�excp_traceback�cmdr# r# r$ r+ r s z EphemeralIPv4Network.__exit__c C s: t �d| j| j| j� t�� �| ji �}|�d�}| j�d�}| j dd� |�di �D �v }| j dd� | j�di �D �v }|r�t �d| j| j � n| j j � | j| j| j� |r�t �d| j� n| j j j | jd d � |r�t �d | j� n | j�t| j j j| jd d �� |�rt �d | j � n | j�t| j j j| j| j�� d S )af Perform the ip commands to fully set up the device. Dhcp clients behave differently in how they leave link state and ip address assignment. Attempt assigning address and setting up link if needed to be done. Set cleanup_cmds to return the interface state to how it was prior to execution of the dhcp client. z:Attempting setup of ephemeral network on %s with %s brd %s�upc S s g | ]}|� d ��qS �r �r ��.0r r# r# r$ � <listcomp>� s z8EphemeralIPv4Network._bringup_device.<locals>.<listcomp>�ipv4c S s g | ]}|� d ��qS r2 r3 r4 r# r# r$ r6 � s �z1Skip adding ip address: %s already has address %sz9Skip bringing up network link: interface %s is already upZinet)ZfamilyzLNot queueing link down: link [%s] was up prior before receiving a dhcp leasezSNot queueing address removal: address %s was assigned before receiving a dhcp leaseN)�LOG�debugr r r �netinfo� netdev_infor r r r �net_opsZadd_addr�link_upr �appendr Z link_downZdel_addr)r Zinterface_addrs_after_dhcpZhas_linkZhad_linkZhas_ipZhad_ipr# r# r$ r& w sl �� � �� ��������z$EphemeralIPv4Network._bringup_devicec C sJ | j D ]>\}}| jj�| j||� | j�dt| jjj| j||d�� qd S )Nr ��gateway) r r r< Z append_router r �insertr � del_route)r Z net_addressr@ r# r# r$ r) � s ���z+EphemeralIPv4Network._bringup_static_routesc C s� | j j�� }d|v r,t�d| j|�� � dS | j jj| j| j| j d� | j � dt | j jj | j| j| j d�� | j jj| jd| jd� | j � dt | j jj | jd�� dS )z<Perform the ip commands to fully setup the router if needed.�defaultz<Skip ephemeral route setup. %s already has default route: %sN)Zsource_addressr r? )r r< Zget_default_router8 r9 r �stripZ add_router r r rA r rB )r �outr# r# r$ r* � s6 � ��� ��z$EphemeralIPv4Network._bringup_router)NN) �__name__� __module__� __qualname__�__doc__�dictr% r, r+ r& r) r* r# r# r# r$ r s �� 0$Ir c @ s( e Zd ZdZdd� Zdd� Zdd� ZdS ) �EphemeralIPv6Networkz�Context manager which sets up a ipv6 link local address The linux kernel assigns link local addresses on link-up, which is sufficient for link-local communication. c C s" |st d�|���|| _|| _dS )z�Setup context manager and validate call signature. @param interface: Name of the network interface to bring up. @param ip: IP address to assign to the interface. @param prefix: IPv6 uses prefixes, not netmasks zCannot init network on {0}N)r r r r )r r r r# r# r$ r% � s z EphemeralIPv6Network.__init__c C s& t �| jd�dkr"| jj�| j� dS )z�linux kernel does autoconfiguration even when autoconf=0 https://www.kernel.org/doc/html/latest/networking/ipv6.html Z operstater1 N)r Z read_sys_netr r r< r= �r r# r# r$ r, s z EphemeralIPv6Network.__enter__c G s dS )z%No need to set the link to down stateNr# �r �_argsr# r# r$ r+ s z EphemeralIPv6Network.__exit__N)rF rG rH rI r% r, r+ r# r# r# r$ rK � s rK c @ s\ e Zd Zdeeeeef d�dd�Zdd� Z dd� Z d d � Z d d � Z d d� Z dd� ZdS )�EphemeralDHCPv4N��connectivity_urls_datac C s6 || _ d | _d | _|| _|p g | _|| _t�� | _d S �N) �iface�_ephipv4�lease� dhcp_log_funcrQ r r: r; r )r r rS rQ rV r# r# r$ r% s zEphemeralDHCPv4.__init__c C s& t | j� }r t�d|� dS | �� S )zUSetup sandboxed dhcp context, unless connectivity_url can already be reached.z:Skip ephemeral DHCP setup, instance has connectivity to %sN)�_check_connectivity_to_imdsrQ r8 r9 � obtain_lease)r Zimds_reached_at_urlr# r# r$ r, ( s ��zEphemeralDHCPv4.__enter__c C s | � � dS )z Teardown sandboxed dhcp context.N)� clean_network)r r- r. r/ r# r# r$ r+ 7 s zEphemeralDHCPv4.__exit__c C s d| _ | jr | j�ddd� dS )z@Exit _ephipv4 context to teardown of ip configuration performed.N)rU rT r+ rL r# r# r$ rY ; s z EphemeralDHCPv4.clean_networkc C s� | j r | j S t| j| j| j�| _ | j s,t� �t�d| j d | j d | j d � ddddg d�dd�}| �|�}|d s�t � |d |d �|d < |d r�| jj � |d �|d < t | jfd | ji|��}|�� || _| j S )a9 Perform dhcp discovery in a sandboxed environment if possible. @return: A dict representing dhcp options on the most recent lease obtained from the dhclient discovery if run, otherwise an error is raised. @raises: NoDHCPLeaseError if no leases could be obtained. z#Received dhcp lease on %s for %s/%sr z fixed-addressz subnet-maskzbroadcast-address)z rfc3442-classless-static-routeszclassless-static-routesr z unknown-121Zrouters)r r r! r r r r r! r r r )rU r r rS rV r r8 r9 � extract_dhcp_options_mappingr Zmask_and_ipv4_to_bcast_addrZ dhcp_clientZparse_static_routesr r r, rT )r �nmap�kwargsZephipv4r# r# r$ rX A sP ��� ������z EphemeralDHCPv4.obtain_leasec C sD i }|� � D ]2\}}t|t�r.| �|||� q | j�|�||< q |S rR )�items� isinstance�list�get_first_option_valuerU r )r r[ �resultZinternal_reference�lease_option_namesr# r# r$ rZ x s �z,EphemeralDHCPv4.extract_dhcp_options_mappingc C s( |D ] }|� |�s| j� |�||< qd S rR )r rU )r Zinternal_mappingrb ra Zdifferent_namesr# r# r$ r` � s z&EphemeralDHCPv4.get_first_option_value)NNN)rF rG rH r r r r' r r% r, r+ rY rX rZ r` r# r# r# r$ rO s �� 7 rO c @ sd e Zd ZdZdeeeeeee f d�dd�Z dd � Z e d e eee f d �d d �Zdd� ZdS )�EphemeralIPNetworkah Combined ephemeral context manager for IPv4 and IPv6 Either ipv4 or ipv6 ephemeral network may fail to initialize, but if either succeeds, then this context manager will not raise exception. This allows either ipv4 or ipv6 ephemeral network to succeed, but requires that error handling for networks unavailable be done within the context. FTN)�ipv6r7 rQ c C s2 || _ || _|| _t�� | _d| _|| _|| _dS )a� Args: distro: The distro object interface: The interface to bring up ipv6: Whether to bring up an ipv6 network ipv4: Whether to bring up an ipv4 network connectivity_urls_data: List of url data to use for connectivity check before attempting to bring up ephemeral networks. If connectivity can be established to any of the urls, then the ephemeral network setup is skipped. � N) r r7 rd � contextlib� ExitStack�stack� state_msgr rQ )r r r rd r7 rQ r# r# r$ r% � s zEphemeralIPNetwork.__init__c C s� | j s| js| S g }d}t| j� }r6t�d|� | S t�d� | j rl| jdd�\}}||O }|rl|�|� | jr�| jdd�\}}||O }|r�|�|� | jr�|s�| j s�d| _|s�t� d� |d �| S ) NFz:We already have connectivity to IMDS at %s, skipping DHCP.z/No connectivity to IMDS, attempting DHCP setup.r7 )� ip_versionrd zusing link-local ipv6zGFailed to bring up EphemeralIPNetwork. Datasource setup cannot continuer ) r7 rd rW rQ r8 r9 � _perform_ephemeral_network_setupr> ri �error)r � exceptionsZephemeral_obtainedZimds_urlZipv4_ephemeral_obtainedZipv4_exceptionZipv6_ephemeral_obtainedZipv6_exceptionr# r# r$ r, � sB �� � � �z EphemeralIPNetwork.__enter__)r7 rd )rj �returnc C s� zf|dkr$| j �t| j| jd�� n.|dkrD| j �t| j| j�� ntd|� ���t�d| j|� W dS t t fy� } z$t�d| j|� d|fW Y d }~S d }~0 0 d S ) a� Attempt to bring up an ephemeral network for the specified IP version. Args: ip_version (str): The IP version to bring up ("ipv4" or "ipv6"). Returns: Tuple: A tuple containing: - a boolean indicating whether an ephemeral network was successfully obtained - an optional exception if ephemeral network setup failed or None if successful r7 )r rS rd zUnsupported IP version: z7Successfully brought up %s for ephemeral %s networking.)TNz2Failed to bring up %s for ephemeral %s networking.FN) rh � enter_contextrO r r rK r r8 r9 r r )r rj r" r# r# r$ rk � s: ������z3EphemeralIPNetwork._perform_ephemeral_network_setupc G s | j �� d S rR )rh �closerM r# r# r$ r+ s zEphemeralIPNetwork.__exit__)FTN)rF rG rH rI �boolr r r r' r r% r, r r � Exceptionrk r+ r# r# r# r$ rc � s �� 6� 1rc )rQ rn c s� � fdd�}� s t �d� dS tdd� � D ��p2d}z$tdd � � D �||d d d �\}}W n0 ty� } zt �d |� W Y d}~n d}~0 0 |s�t �d� dS |S dS )a� Perform a connectivity check to the provided URLs to determine if the ephemeral network setup is necessary. This function attempts to reach one of the provided URLs and returns the URL that was successfully reached. If none of the URLs can be reached, it returns None. The timeout for the request is determined by the highest timeout value provided in the connectivity URLs data. If no timeout is provided, a default timeout of 5 seconds is used. Args: connectivity_urls_data: A list of dictionaries, each containing the following keys: - "url" (str): The URL to check connectivity for. - "headers" (dict, optional): Headers to include in the request. - "timeout" (int, optional): Timeout for the request in seconds. Returns: Optional[str]: The URL that was successfully reached, or None if no connectivity was established. c s � fdd��D �d }|S )z� Helper function to get headers for a given URL from the connectivity URLs data provided to _check_connectivity_to_imds. c s" g | ]}|d � kr|� d��qS ��urlZheadersr3 �r5 Zurl_data�rt r# r$ r6 8 s �zD_check_connectivity_to_imds.<locals>._headers_cb.<locals>.<listcomp>r r# rs rP rv r$ � _headers_cb3 s ��z0_check_connectivity_to_imds.<locals>._headers_cbzZNo connectivity URLs provided. Skipping connectivity check before ephemeral network setup.Nc s s | ]}|� d d�V qdS )�timeoutr Nr3 ru r# r# r$ � <genexpr>H � z._check_connectivity_to_imds.<locals>.<genexpr>� c S s g | ] }|d �qS rv r# ru r# r# r$ r6 N rz z/_check_connectivity_to_imds.<locals>.<listcomp>Fr )ZurlsZ headers_cbrx Zconnect_synchronouslyZmax_waitz8Failed to reach IMDS without ephemeral network setup: %sz5Failed to reach IMDS without ephemeral network setup.)r8 r9 �maxr r )rQ rw rx Zurl_that_worked�_r" r# rP r$ rW s6 �� �� rW )"rI rf Zlogging� functoolsr �typingr r r r r r r Z cloudinit.netr Zcloudinit.netinfor: Zcloudinit.net.dhcpr r Zcloudinit.subpr Zcloudinit.url_helperr r Z getLoggerrF r8 r rK rO rc r' rW r# r# r# r$ �<module> s& $ f s �