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a ]�h � @ s^ d Z ddlmZ ddlmZ ddlmZ ddlmZm Z m Z m Z d dd�Z G d d � d e�Z d S ) z$ IPv4 DHCP socket ================ � )�AddrPool)�dhcp4msg)� RawSocket)�ethmsg�ip4msg�udp4_pseudo_header�udpmsg�D c C sN g d�g d�g d�g d�g d�g d�g d�g d�d d d | gg d �g d �g }|S )N)�( r r � )� r � � )�0 r r � )r r � � )r r r � )�E � r i� )� r r � )�H r r � r r � )r r r i�� )r r r r � )�portZbpf_coder r ��/root/rpmbuild/BUILDROOT/imh-python39-modules-3.9.7-92.el8.x86_64/opt/imh-python/lib/python3.9/site-packages/pyroute2/dhcp/dhcp4socket.py�listen_udp_port s � r c @ s< e Zd ZdZddd�Zdd� Zdd� Zdd d �Zd d� Zd S )� DHCP4Socketa) Parameters: * ifname -- interface name to work on This raw socket binds to an interface and installs BPF filter to get only its UDP port. It can be used in poll/select and provides also the context manager protocol, so can be used in `with` statements. It does not provide any DHCP state machine, and does not inspect DHCP packets, it is totally up to you. No default values are provided here, except `xid` -- DHCP transaction ID. If `xid` is not provided, DHCP4Socket generates it for outgoing messages. r c C s* t �| |t|�� || _tddd�| _d S )Nr i )Zminaddr�release)r �__init__r r r �xid_pool)�selfZifnamer r r r r! 0 s zDHCP4Socket.__init__c C s | S �Nr )r# r r r � __enter__9 s zDHCP4Socket.__enter__c C s | � � d S r$ )�close)r# �exc_type� exc_value� tracebackr r r �__exit__< s zDHCP4Socket.__exit__N�C c C s |pt d| ji�}|d du r,| j�� |d< |�� j}t| j|dt|� d��}t ddt|� d��}| � |�� j|�� j | �|d< |� � t d t|� d dd ��}| � |�� j�|d< |� � t d | jd d��}|�� j|�� j |�� j | }| �|� |� � |S )a Put DHCP message. Parameters: * msg -- dhcp4msg instance * dport -- DHCP server port If `msg` is not provided, it is constructed as default BOOTREQUEST + DHCPDISCOVER. Examples:: sock.put(dhcp4msg({'op': BOOTREQUEST, 'chaddr': 'ff:11:22:33:44:55', 'options': {'message_type': DHCPREQUEST, 'parameter_list': [1, 3, 6, 12, 15], 'requested_ip': '172.16.101.2', 'server_id': '172.16.101.1'}})) The method returns dhcp4msg that was sent, so one can get from there `xid` (transaction id) and other details. Zchaddr�xidNr )Zsport�dport�lenz255.255.255.255)�dstr. �csum� r )r. �protor/ zff:ff:ff:ff:ff:ffr )r/ �src�type)r Zl2addrr" Zalloc�encode�bufr r r. r r0 �resetr r �send) r# �msgr- Zdhcp�data�udpZudph�ip4�ethr r r �put? s0 ��"� �" zDHCP4Socket.putc C sR | � d�\}}t|d��� }t||jd��� }t||jd��� }t||jd��� S )z� Get the next incoming packet from the socket and try to decode it as IPv4 DHCP. No analysis is done here, only MAC/IPv4/UDP headers are stripped out, and the rest is interpreted as DHCP. i )r6 )r6 �offset)�recvfromr �decoder r? r r )r# r: �addrr= r< r; r r r �gety s zDHCP4Socket.get)r )Nr+ ) �__name__� __module__� __qualname__�__doc__r! r% r* r> rC r r r r r s :r N)r )rG Zpyroute2.commonr Zpyroute2.dhcp.dhcp4msgr Zpyroute2.ext.rawsocketr Zpyroute2.protocolsr r r r r r r r r r �<module> s
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