U Zj( @sddlZddlZddlZddlmZddlZddlZd\ZZz ddlZWn&ek rnZ ze ZW5dZ [ XYnXddl m Z ddl m Z Gddde ZdS)N)select)NN)ProxyCommandFailure)ClosingContextManagerc@sPeZdZdZddZddZddZdd Zed d Z ed d Z ddZ dS) ProxyCommanda Wraps a subprocess running ProxyCommand-driven programs. This class implements a the socket-like interface needed by the `.Transport` and `.Packetizer` classes. Using this class instead of a regular socket makes it possible to talk with a Popen'd command that will proxy traffic between the client and a server hosted in another machine. Instances of this class may be used as context managers. cCs@tdkr tt||_tj|jtjtjtjdd|_d|_dS)a Create a new CommandProxy instance. The instance created by this class can be passed as an argument to the `.Transport` class. :param str command_line: the command that should be executed and used as the proxy. Nr)stdinstdoutstderrbufsize) subprocesssubprocess_import_errorshlexsplitcmdPopenPIPEprocesstimeout)selfZ command_linerQ/var/www/html/TRUCKING_PROJECT/venv/lib/python3.8/site-packages/paramiko/proxy.py__init__3s zProxyCommand.__init__c CsRz|jj|Wn6tk rH}ztd|j|jW5d}~XYnXt|S)z Write the content received from the SSH client to the standard input of the forked command. :param str content: string to be sent to the forked command  N) rrwriteIOErrorrjoinrstrerrorlen)rcontenterrrsendGs &zProxyCommand.sendc Cszd}t}t||krd}|jdk rPt|}||jkrFt|j|}t|jjggg|\}}}|r|d|jjkr|t|jj |t|7}q|WStjk r|r|YSYn8t k r} zt d |j | jW5d} ~ XYnXdS)z Read from the standard output of the forked program. :param int size: how many chars should be read :return: the string of bytes read, which may be shorter than requested Nrr)timerrsocketrrrosreadfilenorrrrr) rsizebufferstartZselect_timeoutelapsedrwxrrrrrecvXs.      zProxyCommand.recvcCst|jjtjdSN)r#killrpidsignalSIGTERMrrrrcloseyszProxyCommand.closecCs |jjdk Sr.)r returncoder3rrrclosed|szProxyCommand.closedcCs|jSr.)r6r3rrr_closedszProxyCommand._closedcCs ||_dSr.)r)rrrrr settimeoutszProxyCommand.settimeoutN) __name__ __module__ __qualname____doc__rrr-r4propertyr6r7r8rrrrr's !  r)r#r r1rr"r!r r ImportErrorrZparamiko.ssh_exceptionrZ paramiko.utilrrrrrrs