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dhcp.cpython-39.opt-1.pyc
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a '�Dg֏ � @ s� d dl Z d dlZd dlZd dlZd dlZd dlZd dlZd dlZd dlZd dl m Z d dl m Z d dl mZ d dlmZmZmZmZmZmZ d dlZd dlmZmZmZ d dlm Z m Z e� e �Z dZ!d Z"d Z#d Z$G d d � d e%�Z&G dd� de&�Z'G dd� de&�Z(G dd� de&�Z)d%ee*ef d�dd�Z+dd� Z,d&dd�Z-d'dd �Z.G d d � d e j/�Z0G d d � d e0�Z1G d!d"� d"e0�Z2G d#d$� d$e0�Z3e2e1e3gZ4dS )(� N)�suppress)�StringIO)�TimeoutExpired)�Any�Callable�Dict�List�Optional�Tuple)�subp� temp_utils�util)�get_interface_mac�is_ib_interfacez/run/systemd/netif/leasesz/var/lib/dhclientz .+\.leases?$aN #!/bin/sh log() { echo "udhcpc[$PPID]" "$interface: $2" } [ -z "$1" ] && echo "Error: should be called from udhcpc" && exit 1 case $1 in bound|renew) cat <<JSON > "$LEASE_FILE" { "interface": "$interface", "fixed-address": "$ip", "subnet-mask": "$subnet", "routers": "${router%% *}", "static_routes" : "${staticroutes}" } JSON ;; deconfig) log err "Not supported" exit 1 ;; leasefail | nak) log err "configuration failed: $1: $message" exit 1 ;; *) echo "$0: Unknown udhcpc command: $1" >&2 exit 1 ;; esac c @ s e Zd ZdZdS )�NoDHCPLeaseErrorz'Raised when unable to get a DHCP lease.N��__name__� __module__� __qualname__�__doc__� r r �6/usr/lib/python3.9/site-packages/cloudinit/net/dhcp.pyr A s r c @ s e Zd ZdZdS )�InvalidDHCPLeaseFileErrorz�Raised when parsing an empty or invalid dhclient.lease file. Current uses are DataSourceAzure and DataSourceEc2 during ephemeral boot to scrape metadata. Nr r r r r r E s r c @ s e Zd ZdZdS )�NoDHCPLeaseInterfaceErrorz7Raised when unable to find a viable interface for DHCP.Nr r r r r r M s r c @ s e Zd ZdZdS )� NoDHCPLeaseMissingDhclientErrorz$Raised when unable to find dhclient.Nr r r r r r Q s r ��returnc C s2 |p| j }|du r"t�d� t� �| j�||| �S )a Perform dhcp discovery if nic valid and dhclient command exists. If the nic is invalid or undiscoverable or dhclient command is not found, skip dhcp_discovery and return an empty dict. @param nic: Name of the network interface we want to run dhclient on. @param dhcp_log_func: A callable accepting the dhclient output and error streams. @return: A list of dicts representing dhcp options for each lease obtained from the dhclient discovery if run, otherwise an empty list is returned. Nz1Skip dhcp_discovery: Unable to find fallback nic.)Zfallback_interface�LOG�debugr Z dhcp_client�dhcp_discovery)�distroZnic� dhcp_log_func� interfacer r r � maybe_perform_dhcp_discoveryU s r# c C s t tjt| �dd��S )z�Parse a systemd lease file content as in /run/systemd/netif/leases/ Parse this (almost) ini style file even though it says: # This is private data. Do not parse. Simply return a dictionary of key/values.F)Z list_values)�dict� configobjZ ConfigObjr )�contentr r r �networkd_parse_leasel s r' c C sP | du r t } i }tj�| �s |S t�| �D ] }tt�tj�| |���||< q*|S )z�Return a dictionary of dictionaries representing each lease found in lease_d.i The top level key will be the filename, which is typically the ifindex.N) �NETWORKD_LEASES_DIR�os�path�isdir�listdirr' r �load_text_file�join)�leases_d�retZlfiler r r �networkd_load_leasesw s � r1 c C sF |d u r t }t|d�}t|�� �D ] \}}|�| �r"|| S q"d S )N)r/ )r( r1 �sorted�items�get)Zkeynamer/ ZleasesZ_ifindex�datar r r � networkd_get_option_from_leases� s r6 c @ s� e Zd ZdZdZdd� Zedd� �Zedd� �Zee d �d d ��Z ee d �d d ��Z e j e ee ef d�dd��Zee j e eee e f d�dd���Ze j de ee ee ef d�dd��ZdS )� DhcpClient� � c C s t �| j�| _| jst� �d S �N)r �which� client_name�dhcp_client_pathr ��selfr r r �__init__� s zDhcpClient.__init__c C s t j d| jgddgd� d S )NZpkillr � �Zrcs)r r< )�clsr r r �kill_dhcp_client� s zDhcpClient.kill_dhcp_clientc C s* | � � t�d�}|D ]}t�|� qd S )Nz/var/lib/dhcp/*)rD �globr) �remove)rC �files�filer r r � clear_leases� s zDhcpClient.clear_leases)�dhcp_interfacec C s |j d| j|ddgd� d S )N�startr rA rB �Zmanage_servicer< �rC rJ r r r r � start_service� s �zDhcpClient.start_servicec C s |j d| jddgd� d S )N�stopr rA rB rL rM r r r � stop_service� s zDhcpClient.stop_service�r" r c C s i S )z�Get the most recent lease from the ephemeral phase as a dict. Return a dict of dhcp options. The dict contains key value pairs from the most recent lease. r �r? r" r r r �get_newest_lease� s zDhcpClient.get_newest_lease��routesr c C s g S )ap parse classless static routes from string The tuple is composed of the network_address (including net length) and gateway for a parsed static route. @param routes: string containing classless static routes @returns: list of tuple(str, str) for all valid parsed routes until the first parsing error. r )rU r r r �parse_static_routes� s z DhcpClient.parse_static_routesN�r" r! r c C s i S )a� Run dhcp client on the interface without scripts or filesystem artifacts. @param interface: Name of the network interface on which to send a dhcp request @param dhcp_log_func: A callable accepting the client output and error streams. @param distro: a distro object for network interface manipulation @return: dict of lease options representing the most recent dhcp lease parsed from the dhclient.lease file r )r? r" r! r r r r r � s zDhcpClient.dhcp_discovery)NN)r r r r< �timeoutr@ � classmethodrD rI �strrN rP �abc�abstractmethodr r rS � staticmethodr r rV r r r r r r r r7 � s0 � �r7 c s� e Zd ZdZ� fdd�Zeeeeee f d�dd��Z edd� �Z eeee f d �d d �Z dee e eee f d �dd�Zeeeeeef d�dd��Zee e d�dd��Zed�dd�Z� ZS )� IscDhclientZdhclientc s t � �� d| _d S )Nz/run/dhclient.lease��superr@ � lease_filer> �� __class__r r r@ � s zIscDhclient.__init__)� lease_contentr c C s� t �dt j�}g }t| �dkr"g S |�| �D ]t}g }|�d�D ]2}|�� �dd��dd�}|r>|�|�dd�� q>t |�}|� d �}|r�t � |�|d < |�|� q,|S ) z�parse the content of a lease file @param lease_content: a string containing the contents of an isc-dhclient lease @return: a list of leases, most recent last zlease {(?P<lease>.*?)}\nr �;�"r8 zoption � rA � unknown-245) �re�compile�DOTALL�len�findall�split�strip�replace�appendr$ r4 r^ �get_ip_from_lease_value)rd Z lease_regex� dhcp_leases�leaseZ lease_options�line�options�opt_245r r r � parse_leases� s$ � zIscDhclient.parse_leasesc C sx | � dd�}t|�dkrdd}|�d�D ] }t|�dkr>d| }||7 }q&t�dt|� dd�d��}n |�d �}t�|�S ) N�\r8 � �:rA �0z>L� zutf-8) rp rl rn �struct�pack�int�encode�socket� inet_ntoa)Zfallback_lease_valueZunescaped_valueZ hex_stringZhex_pairZ packed_bytesr r r rr s � z#IscDhclient.get_ip_from_lease_valuerQ c C s` t t��D t�| j�}|r>| �|�}|r>|d W d � S W d � n1 sR0 Y i S )a� Get the most recent lease from the ephemeral phase as a dict. Return a dict of dhcp options. The dict contains key value pairs from the most recent lease. @param interface: an interface string - not used in this class, but required for function signature compatibility with other classes that require a distro object @raises: InvalidDHCPLeaseFileError on empty or unparsable leasefile content. ���N)r �FileNotFoundErrorr r- ra rx )r? r" r& rs r r r rS s 4z IscDhclient.get_newest_leaseNrW c C s� t �d|� d}d}d}t| j| �}t| jd �}tt��& t�|� t�| j� W d � n1 sh0 Y |j � |� t |�r�dt |�dd� } d|| f } t jd d �} tj�| |d �}t�|| � z$t�|�| j| j|||��\} } W nD tj�y8 } z(t �d |j|j|j� t|�W Y d}~n d}~0 0 tj|| jg|dd �}|�rvt � dd�dd� |D ��� i S d}d}d}d}t |�D ]�}zt� |�� � }t|�}W n> t�y� d|� d�}Y nX t �y� d|� d�}Y n:0 |�!|�}|dk�r$t �d|� t�"|t#j$� d } �q<t%�&|� �q�t �|� |�sRt �'d||d � |du�rf|| | � | �(|�}|�rz|S t)� �dS ) a� Run dhclient on the interface without scripts/filesystem artifacts. @param interface: Name of the network interface on which to send a dhcp request @param dhcp_log_func: A callable accepting the dhclient output and error streams. @param distro: a distro object for network interface manipulation @return: dict of lease options representing the most recent dhcp lease parsed from the dhclient.lease file �!Performing a dhcp discovery on %sz/run/dhclient.pidN�{�G�z�?� z20:%s�$ z0interface "%s" {send dhcp-client-identifier %s;}T�Z needs_exez-dhclient.confz3dhclient exited with code: %s stderr: %r stdout: %r)�maxwaitZnaplenz+dhclient did not produce expected files: %sz, c s s | ]}t j�|�V qd S r: )r) r* �basename)�.0�fr r r � <genexpr>} � z-IscDhclient.dhcp_discovery.<locals>.<genexpr>�unknownFr8 �No PID file found at z, dhclient is still running�PID file contained [z ], dhclient is still runningrA z killing dhclient with pid=%szCdhclient(pid=%s, parentpid=%s) failed to daemonize after %s secondsg $@)*r r r� rX r r� r) rF ra �net_ops�link_upr r r �get_tmp_ancestorr* r. r � write_filer Zbuild_dhclient_cmdr= �ProcessExecutionError� exit_code�stderr�stdoutr Zwait_for_files�warning�ranger- ro � ValueErrorZ get_proc_ppid�kill�signal�SIGKILL�time�sleep�errorrS r )r? r" r! r �pid_fileZ config_file� sleep_time� sleep_cyclesr� Zdhcp_client_identifierZinterface_dhclient_content�tmp_dir�out�errr� �missingZppidZ daemonized� pid_content� debug_msg�_�pidrt r r r r & s� * ��� �� � �� � � � zIscDhclient.dhcp_discoveryrT c sB | � d�� dd� t�d� �D �}g }d� v r:dd� |D �}� fdd�}d }t|�D �]�\}}||k rfqRt|�}|td d �v r�d }t||d � �|k r�|||t||d � �� | S d�||d |d � �} d�||d || � �} || }�n2|tdd �v �r�d}t||d � �|k �r>|||t||d � �� | S d�||d |d � dg �} d�||d || � �} || }�n�|td d�v �rd}t||d � �|k �r�|||t||d � �� | S d�||d |d � ddg �} d�||d || � �} || }�n|tdd �v �r�d}t||d � �|k �r`|||t||d � �� | S d�||d |d � g d� �} d�||d || � �} || }n�|d k�rd}t||d � �|k �r�|||t||d � �� | S d} d�||d || � �} || }nt� d|� | S |� d | |f | f� qR|S ) a( parse rfc3442 format and return a list containing tuple of strings. The tuple is composed of the network_address (including net length) and gateway for a parsed static route. It can parse two formats of rfc3442, one from dhcpcd and one from dhclient (isc). @param rfc3442: string in rfc3442 format (isc or dhcpd) @returns: list of tuple(str, str) for all valid parsed routes until the first parsing error. e.g.: sr=parse_static_routes( "32,169,254,169,254,130,56,248,255,0,130,56,240,1") sr=[ ("169.254.169.254/32", "130.56.248.255"), ("0.0.0.0/0", "130.56.240.1") ] sr2 = parse_static_routes( "24.191.168.128 192.168.128.1,0 192.168.128.1") sr2 = [ ("191.168.128.0/24", "192.168.128.1"), ("0.0.0.0/0", "192.168.128.1") ] # unknown-121 option format sr3 = parse_static_routes( "0:a:0:0:1:20:a8:3f:81:10:a:0:0:1:20:a9:fe:a9:fe:a:0:0:1") sr3 = [ ("0.0.0.0/0", "10.0.0.1"), ("168.63.129.16/32", "10.0.0.1"), ("169.254.169.254/32", "10.0.0.1"), ] Python version of isc-dhclient's hooks: /etc/dhcp/dhclient-exit-hooks.d/rfc3442-classless-routes re c S s g | ] }|r|�qS r r �r� �tokr r r � <listcomp>� r� z3IscDhclient.parse_static_routes.<locals>.<listcomp>z[, . :]r{ c S s g | ]}t t|d ���qS )r} )rZ r� r� r r r r� � r� c s d| ||� f }t �|� d S )Nz�RFC3442 string malformed. Current route has CIDR of %s and requires %s significant octets, but only %s remain. Verify DHCP rfc3442-classless-static-routes value: %s)r r� )Zcidr�requiredZremain�msg�Zrfc3442r r � _trunc_error� s ��z5IscDhclient.parse_static_routes.<locals>._trunc_errorr � �! � N�.rA � � � rz r| � � � r� )r| r| r| z0.0.0.0zSParsed invalid net length "%s". Verify DHCP rfc3442-classless-static-routes value.z%s/%s) �rstripri rn � enumerater� r� rl r. r r� rq ) rU �tokens� static_routesr� Z current_idx�idxr� Z net_lengthZreq_toksZ net_addressZgatewayr r� r rV � s| * " � ��z IscDhclient.parse_static_routesr c C s� d}| j | jfttffD ]�\}}|s&qg }zt�|�}W n tyN Y qY n0 d}|D ]<}t�||�sjqXtj � ||�}tj � |�}||krX|}|}qX|r| S qdS )z�Get the latest lease file from a distro-managed dhclient Doesn't consider the ephemeral timeframe lease. @param distro: used for distro-specific lease location and filename @return: The most recent lease file, or None Ng �) Zdhclient_lease_directoryZdhclient_lease_file_regex�DHCLIENT_FALLBACK_LEASE_DIR� DHCLIENT_FALLBACK_LEASE_REGEXr) r, r� ri �searchr* r. �getmtime) r Z latest_fileZ directoryZregexZ lease_filesZ latest_mtime�fnameZabs_path�mtimer r r �!get_newest_lease_file_from_distro% s2 �� z-IscDhclient.get_newest_lease_file_from_distro)�keyc C sJ | � |�}|rFt�|�}|rFt| �|��D ]}|�|�}|r*| S q*dS )a8 Get a key from the latest lease from distro-managed dhclient Doesn't consider the ephemeral timeframe lease. @param lease_dir: distro-specific lease to check @param lease_file_regex: distro-specific regex to match lease name @return: The most recent lease file, or None N)r� r r- �reversedrx r4 )r? r r� ra r& rt Zserverr r r �get_key_from_latest_leaseQ s z%IscDhclient.get_key_from_latest_lease)NN)r r r r< r@ r] rZ r r r rx rr rS r r r r rV r� r� � __classcell__r r rb r r^ � s( � � w+r^ c @ s� e Zd ZdZdZdeee eee f d�dd�Z e e e ee d�dd ��Ze eeed �d d ��Zeeee f d �dd�Ze eeeeef d�dd��ZdS )�DhcpcdZdhcpcdi, NrW c C s. t �d|� d}t| j| �}g }|j�|� �ztt|�r@dg}| jdddddg|�|�}tj|| jd �\}} |d ur�||| � | � |�} | �r�t�g |�d ��j � � } d } d } d }t |�D ]�}zNt �| �� � } t| �}|�|�} | �r t �d|| � t�| tj� W �q�W nd t�y6 t �d| � Y �q�Y nH t�yT d| � d�}Y n* t�yr d| � d�}Y n 0 | W S t�|� q�t �|� | W S td��W n� t�y� } z(t �d|j|j|j � t|�W Y d }~nLd }~0 tj �y( } z(t �d|j |j|j � t|�W Y d }~n d }~0 0 d S )a� Run dhcpcd on the interface without scripts/filesystem artifacts. @param interface: Name of the network interface on which to send a dhcp request @param dhcp_log_func: A callable accepting the client output and error streams. @param distro: a distro object for network interface manipulation @return: dict of lease options representing the most recent dhcp lease parsed from the dhclient.lease file r� r� z --clientid� --ipv4onlyz--waitipz --persistentz--noarpz--script=/bin/true)rX Nz-PFr8 z!killing dhcpcd with pid=%s gid=%sz9Process group id [%s] has already exited, nothing to killr� z, dhcpcd is still runningr� z], dhcpcd is still runningzNo lease foundz8dhcpcd timed out after %s seconds: stderr: %r stdout: %r�1dhcpcd exited with code: %s stderr: %r stdout: %r) r r r� rX r� r� r r< r rS r� ro r� r r- Z get_proc_pgidr) �killpgr� r� �ProcessLookupErrorr� r� r� r� r r r� r� r� )r? r" r! r r� r� Zinfiniband_argumentZcommandr� r� rt r� r� �gidr� r� r� r� r r r r h s� ��� � � � � � ��zDhcpcd.dhcp_discovery)r5 �dhcp_option_numberr c C s< d}t td�dd�}|| |�D ]\}}||kr | S q dS )aV get a specific option from a binary lease file This is required until upstream dhcpcd supports unknown option 245 upstream bug: https://github.com/NetworkConfiguration/dhcpcd/issues/282 @param data: Binary lease data @param number: Option number to return @return: the option (bytes) or None �� )r5 �indexc s sX t | �|d krT| | }| d| }| d| d| | � }||fV d| | }q dS )z�options are variable length, and consist of the following format option number: 1 byte option length: 1 byte option data: variable length (see length field) r� rA N)rl )r5 r� �code�length�optionr r r � iter_options� s z>Dhcpcd.parse_unknown_options_from_packet.<locals>.iter_optionsN)�bytesr� )r5 r� ZINDEXr� r� r� r r r �!parse_unknown_options_from_packet� s z(Dhcpcd.parse_unknown_options_from_packet)� lease_dumpr" r c C s t �d|| � zHtdd� | �� �dd��d�D ��}|sTd}t �|| � t|| ��W n6 ty� } z t �d| � t|�W Y d }~n d }~0 0 ||d < d d � |� � D �}d dd�}|� � D ] \}}||v r�|� |�||< q�t � d|� d��}t �|d�} | �r t�| �|d< |S )a` parse the output of dhcpcd --dump map names to the datastructure we create from dhclient example dhcpcd output: broadcast_address='192.168.15.255' dhcp_lease_time='3600' dhcp_message_type='5' dhcp_server_identifier='192.168.0.1' domain_name='us-east-2.compute.internal' domain_name_servers='192.168.0.2' host_name='ip-192-168-0-212' interface_mtu='9001' ip_address='192.168.0.212' network_number='192.168.0.0' routers='192.168.0.1' subnet_cidr='20' subnet_mask='255.255.240.0' z)Parsing dhcpcd lease for interface %s: %rc S s" g | ]}d |v r|j d dd��qS )�=rA )�maxsplit)rn )r� �ar r r r� ( s �z-Dhcpcd.parse_dhcpcd_lease.<locals>.<listcomp>�'r8 � z;No valid DHCP lease configuration found in dhcpcd lease: %rz Error parsing dhcpcd lease: %rNr" c S s i | ]\}}|� d d�|�qS )r� �-)rp )r� r� �valuer r r � <dictcomp>= r� z-Dhcpcd.parse_dhcpcd_lease.<locals>.<dictcomp>z fixed-addressr� )z ip-addresszclassless-static-routesz/var/lib/dhcpcd/z.lease� rh )r r r$ ro rp rn r� r r� r3 �popr Zload_binary_filer� r� r� r� ) r� r" rt r� r� Zname_map�sourceZ destinationZ dhcp_messagerw r r r �parse_dhcpcd_lease s@ ���� � � zDhcpcd.parse_dhcpcd_leaserQ c C sh z | � t�| jdd|g�j|�W S tjyb } z(t�d|j|j|j� t |�W Y d}~n d}~0 0 dS )z�Return a dict of dhcp options. @param interface: which interface to dump the lease from @raises: InvalidDHCPLeaseFileError on empty or unparsable leasefile content. z --dumpleaser� r� N) r� r r< r� r� r r r� r� r )r? r" r� r r r rS T s& ��� �zDhcpcd.get_newest_leaserT c C sD | � � }|r4dd� t|ddd� |ddd� �D �S t�d| � g S )a� classless static routes as returned from dhcpcd --dumplease and return a list containing tuple of strings. The tuple is composed of the network_address (including net length) and gateway for a parsed static route. @param routes: string containing classless static routes @returns: list of tuple(str, str) for all valid parsed routes until the first parsing error. e.g.: sr=parse_static_routes( "0.0.0.0/0 10.0.0.1 168.63.129.16/32 10.0.0.1" ) sr=[ ("0.0.0.0/0", "10.0.0.1"), ("169.63.129.16/32", "10.0.0.1"), ] c S s g | ]}|�qS r r �r� �ir r r r� � r� z.Dhcpcd.parse_static_routes.<locals>.<listcomp>Nr� rA z'Malformed classless static routes: [%s])rn �zipr r� �rU r� r r r rV q s ( zDhcpcd.parse_static_routes)NN)r r r r< rX rZ r r r r r r] r� r� r� r� rS r r rV r r r r r� d s$ � � w�+H r� c sx e Zd ZdZ� fdd�Zdeee eee f d�dd�Z eeee f d�d d �Z e ee eeef d �d d ��Z� ZS )�UdhcpcZudhcpcc s t � �� d| _d S )Nr8 r_ r> rb r r r@ � s zUdhcpc.__init__NrW c C sV t �d|� tjdd�}tj�||d �| _tt �� t� | j� W d � n1 sV0 Y |j � |� tj�|d�}t �|td� | jdd d |d |d d ddg }t|�r�|�dd�t|�dd� �dd��g� z tj|d| jidd�\}}W nD tj�y6 } z(t �d| j| j| j� t| �W Y d} ~ n d} ~ 0 0 |du�rL|||� | � |�S )ar Run udhcpc on the interface without scripts or filesystem artifacts. @param interface: Name of the network interface on which to run udhcpc. @param dhcp_log_func: A callable accepting the udhcpc output and error streams. @return: A list of dicts of representing the dhcp leases parsed from the udhcpc lease file. r� Tr� z .lease.jsonN� udhcpc_scripti� z-OZ staticroutesz-iz-sz-nz-qz-fz-vz-xz 0x3d:20{}r� r{ r8 Z LEASE_FILE)Z update_envZcapturez1udhcpc exited with code: %s stderr: %r stdout: %r) r r r r� r) r* r. ra r r� rF r� r� r r� � UDHCPC_SCRIPTr< r �extend�formatr rp r r� r� r� r� r rS ) r? r" r! r r� r� �cmdr� r� r� r r r r � sV * ���� �� zUdhcpc.dhcp_discoveryrQ c C s t �t �| j��S )a� Get the most recent lease from the ephemeral phase as a dict. Return a dict of dhcp options. The dict contains key value pairs from the most recent lease. @param interface: an interface name - not used in this class, but required for function signature compatibility with other classes that require a distro object @raises: InvalidDHCPLeaseFileError on empty or unparsable leasefile content. )r Z load_jsonr- ra rR r r r rS � s zUdhcpc.get_newest_leaserT c C s8 | � � }|r4dd� t|d d d� |dd d� �D �S g S )Nc S s g | ]}|�qS r r r� r r r r� � r� z.Udhcpc.parse_static_routes.<locals>.<listcomp>r� rA )rn r� r� r r r rV � s (zUdhcpc.parse_static_routes)NN)r r r r< r@ rZ r r r r r rS r] r r rV r� r r rb r r� � s � � Hr� )NN)N)N)5r[ rE Zloggingr) ri r� r� r~ r� � contextlibr �ior � subprocessr �typingr r r r r r r% Z cloudinitr r r Z cloudinit.netr r Z getLoggerr r r( r� r� r� � Exceptionr r r r rZ r# r' r1 r6 �ABCr7 r^ r� r� ZALL_DHCP_CLIENTSr r r r �<module> sR ! � � K .f