a d)(e @sddlZddlZddlZddlmZddlZddlZd\ZZz ddlZWn(eypZ ze ZWYdZ [ n dZ [ 00ddl 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@tdur 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_liner2/usr/lib/python3.9/site-packages/paramiko/proxy.py__init__3s zProxyCommand.__init__c CsTz|jj|Wn8tyJ}z td|j|jWYd}~n d}~00t|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)rZcontenterrrsendGs *zProxyCommand.sendc Cszd}t}t||krd}|jdurPt|}||jkrFt|j|}t|jjggg|\}}}|r|d|jjkr|t|jj |t|7}q|WStjy|r|YSYn:t y} z t d |j | jWYd} ~ n d} ~ 00dS)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 |jjduSr-)r returncoder2rrrclosed|szProxyCommand.closedcCs|jSr-)r5r2rrr_closedszProxyCommand._closedcCs ||_dSr-)r)rrrrr settimeoutszProxyCommand.settimeoutN) __name__ __module__ __qualname____doc__rrr,r3propertyr5r6r7rrrrr's !  r)r"r r0rr!r r r ImportErrorrZparamiko.ssh_exceptionrZ paramiko.utilrrrrrrs