[Twisted-Python] Sending commands when using Telnet client
Yes, I'm sort of a Twisted newbie, so maybe this has an obvious answer, but I'm just not seeing it. I have a Twisted program that I need to add in the ability to make a client telnet connection to a remote server and send some commands to it and deal with the data received. In my main program I have this line of code: reactor.connectTCP("mytelnethost", 24, Connections.TelnetConnection("myname of object",events,"command to run")) My Connections.TelnetConnection class looks like this: from twisted.internet.protocol import Protocol, ReconnectingClientFactory from twisted.conch.telnet import Telnet class TelnetClient(Telnet): def connectionMade(self): print "connection made" self.write("\r\n") def write(self, data): print data Telnet._write(self, data+"\r\n") def dataReceived(self, data): print "received:", data if "User Name:" in data: self.write("user") if "Password:" in data: self.write("password") if ">" in data: time.sleep(2) self.write("connect") if "Connector Name:" in data: time.sleep(2) self.write("another command") class TelnetConnection(Connection, ReconnectingClientFactory): """ Telnets to host:port and executes cmd. cmd """ protocol = TelnetClient def __init__(self, name, eventQueue, cmd=None): Connection.__init__(self, name) def clientConnectionFailed(self, connector, reason): print 'connection failed:', reason.getErrorMessage() def clientConnectionLost(self, connector, reason): print 'connection lost:', reason.getErrorMessage() This all works great, except that the command sequence is hard coded in the TelnetClient class. I want to be able to reference the "cmd" parameter, which could be a list of commands to iterate over,etc. But I don't see how I can access the "cmd" parameter that gets passed into the TelnetConnection class from within the TelnetClient class. I'm really desparate for some help, I've been racking my brain on this since yesterday morning. Thanks, Don
On Tue, 28 Feb 2006 10:59:50 -0800, Don Smith <donwsmith@gmail.com> wrote:
Yes, I'm sort of a Twisted newbie, so maybe this has an obvious answer, but I'm just not seeing it.
I have a Twisted program that I need to add in the ability to make a client telnet connection to a remote server and send some commands to it and deal with the data received.
[snip]
This all works great, except that the command sequence is hard coded in the TelnetClient class. I want to be able to reference the "cmd" parameter, which could be a list of commands to iterate over,etc. But I don't see how I can access the "cmd" parameter that gets passed into the TelnetConnection class from within the TelnetClient class.
I'm really desparate for some help, I've been racking my brain on this since yesterday morning.
The usual approach is to save the data (`cmd' in this case) on the factory and use `self.factory.stuff' from the protocol. The `factory' attribute is set on the protocol class by the default `buildProtocol' implementation. It is not available in the protocol's `__init__', but is available by the time `connectionMade' is called. Jean-Paul
Thank you, thank you, thank you!!! -Don On 2/28/06, Jean-Paul Calderone <exarkun@divmod.com> wrote:
Yes, I'm sort of a Twisted newbie, so maybe this has an obvious answer, but I'm just not seeing it.
I have a Twisted program that I need to add in the ability to make a client telnet connection to a remote server and send some commands to it and deal with the data received.
[snip]
This all works great, except that the command sequence is hard coded in
On Tue, 28 Feb 2006 10:59:50 -0800, Don Smith <donwsmith@gmail.com> wrote: the
TelnetClient class. I want to be able to reference the "cmd" parameter, which could be a list of commands to iterate over,etc. But I don't see how I can access the "cmd" parameter that gets passed into the TelnetConnection class from within the TelnetClient class.
I'm really desparate for some help, I've been racking my brain on this since yesterday morning.
The usual approach is to save the data (`cmd' in this case) on the factory and use `self.factory.stuff' from the protocol. The `factory' attribute is set on the protocol class by the default `buildProtocol' implementation. It is not available in the protocol's `__init__', but is available by the time `connectionMade' is called.
Jean-Paul
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As you can see in twisted.internet.protocol.Factory def buildProtocol(self, addr): """Create an instance of a subclass of Protocol. The returned instance will handle input on an incoming server connection, and an attribute \"factory\" pointing to the creating factory. Override this method to alter how Protocol instances get created. @param addr: an object implementing L{twisted.internet.interfaces.IAddress} """ p = self.protocol() p.factory = self return p ReconnectingClientFactory inherits that method, so each TelnetClient instance it builds will have a self.factory you can use to access your cmd list. Hope that helps, -- alecu On 2/28/06, Don Smith <donwsmith@gmail.com> wrote:
Yes, I'm sort of a Twisted newbie, so maybe this has an obvious answer, but I'm just not seeing it.
I have a Twisted program that I need to add in the ability to make a client telnet connection to a remote server and send some commands to it and deal with the data received.
In my main program I have this line of code: reactor.connectTCP("mytelnethost", 24, Connections.TelnetConnection("myname of object",events,"command to run"))
My Connections.TelnetConnection class looks like this:
from twisted.internet.protocol import Protocol, ReconnectingClientFactory from twisted.conch.telnet import Telnet
class TelnetClient(Telnet): def connectionMade(self): print "connection made" self.write("\r\n")
def write(self, data): print data Telnet._write(self, data+"\r\n")
def dataReceived(self, data): print "received:", data if "User Name:" in data: self.write("user")
if "Password:" in data: self.write("password")
if ">" in data: time.sleep(2) self.write("connect") if "Connector Name:" in data: time.sleep(2) self.write("another command")
class TelnetConnection(Connection, ReconnectingClientFactory): """ Telnets to host:port and executes cmd. cmd """ protocol = TelnetClient def __init__(self, name, eventQueue, cmd=None): Connection.__init__(self, name)
def clientConnectionFailed(self, connector, reason): print 'connection failed:', reason.getErrorMessage()
def clientConnectionLost(self, connector, reason): print 'connection lost:', reason.getErrorMessage()
This all works great, except that the command sequence is hard coded in the TelnetClient class. I want to be able to reference the "cmd" parameter, which could be a list of commands to iterate over,etc. But I don't see how I can access the "cmd" parameter that gets passed into the TelnetConnection class from within the TelnetClient class.
I'm really desparate for some help, I've been racking my brain on this since yesterday morning.
Thanks,
Don
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So, I have this working now. I can send commands to the telnet server, dynamically. However, is there a way to supress the output of the data I get back so it doesn't flood my shell (stdout)? Thanks, Don On 2/28/06, Alejandro J. Cura <alecu@vortech.com.ar> wrote:
As you can see in twisted.internet.protocol.Factory
def buildProtocol(self, addr): """Create an instance of a subclass of Protocol.
The returned instance will handle input on an incoming server connection, and an attribute \"factory\" pointing to the creating factory.
Override this method to alter how Protocol instances get created.
@param addr: an object implementing L{twisted.internet.interfaces.IAddress} """ p = self.protocol() p.factory = self return p
ReconnectingClientFactory inherits that method, so each TelnetClient instance it builds will have a self.factory you can use to access your cmd list.
Hope that helps, -- alecu
Yes, I'm sort of a Twisted newbie, so maybe this has an obvious answer, but I'm just not seeing it.
I have a Twisted program that I need to add in the ability to make a client telnet connection to a remote server and send some commands to it and deal with the data received.
In my main program I have this line of code: reactor.connectTCP("mytelnethost", 24, Connections.TelnetConnection("myname of object",events,"command to run"))
My Connections.TelnetConnection class looks like this:
from twisted.internet.protocol import Protocol, ReconnectingClientFactory from twisted.conch.telnet import Telnet
class TelnetClient(Telnet): def connectionMade(self): print "connection made" self.write("\r\n")
def write(self, data): print data Telnet._write(self, data+"\r\n")
def dataReceived(self, data): print "received:", data if "User Name:" in data: self.write("user")
if "Password:" in data: self.write("password")
if ">" in data: time.sleep(2) self.write("connect") if "Connector Name:" in data: time.sleep(2) self.write("another command")
class TelnetConnection(Connection, ReconnectingClientFactory): """ Telnets to host:port and executes cmd. cmd """ protocol = TelnetClient def __init__(self, name, eventQueue, cmd=None): Connection.__init__(self, name)
def clientConnectionFailed(self, connector, reason): print 'connection failed:', reason.getErrorMessage()
def clientConnectionLost(self, connector, reason): print 'connection lost:', reason.getErrorMessage()
This all works great, except that the command sequence is hard coded in
On 2/28/06, Don Smith <donwsmith@gmail.com> wrote: the
TelnetClient class. I want to be able to reference the "cmd" parameter, which could be a list of commands to iterate over,etc. But I don't see how I can access the "cmd" parameter that gets passed into the TelnetConnection class from within the TelnetClient class.
I'm really desparate for some help, I've been racking my brain on this since yesterday morning.
Thanks,
Don
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On Tue, 28 Feb 2006 17:31:46 -0800, Don Smith <donwsmith@gmail.com> wrote:
On 2/28/06, Alejandro J. Cura <alecu@vortech.com.ar> wrote:
Yes, I'm sort of a Twisted newbie, so maybe this has an obvious answer, but I'm just not seeing it.
I have a Twisted program that I need to add in the ability to make a client telnet connection to a remote server and send some commands to it and deal with the data received.
In my main program I have this line of code: reactor.connectTCP("mytelnethost", 24, Connections.TelnetConnection("myname of object",events,"command to run"))
My Connections.TelnetConnection class looks like this:
from twisted.internet.protocol import Protocol, ReconnectingClientFactory from twisted.conch.telnet import Telnet
class TelnetClient(Telnet): def connectionMade(self): print "connection made" self.write("\r\n")
def write(self, data): print data Telnet._write(self, data+"\r\n")
def dataReceived(self, data): print "received:", data if "User Name:" in data: self.write("user")
if "Password:" in data: self.write("password")
if ">" in data: time.sleep(2) self.write("connect") if "Connector Name:" in data: time.sleep(2) self.write("another command")
class TelnetConnection(Connection, ReconnectingClientFactory): """ Telnets to host:port and executes cmd. cmd """ protocol = TelnetClient def __init__(self, name, eventQueue, cmd=None): Connection.__init__(self, name)
def clientConnectionFailed(self, connector, reason): print 'connection failed:', reason.getErrorMessage()
def clientConnectionLost(self, connector, reason): print 'connection lost:', reason.getErrorMessage()
This all works great, except that the command sequence is hard coded in
On 2/28/06, Don Smith <donwsmith@gmail.com> wrote: the
TelnetClient class. I want to be able to reference the "cmd" parameter, which could be a list of commands to iterate over,etc. But I don't see how I can access the "cmd" parameter that gets passed into the TelnetConnection class from within the TelnetClient class.
I'm really desparate for some help, I've been racking my brain on this since yesterday morning.
Thanks,
Don
As you can see in twisted.internet.protocol.Factory
def buildProtocol(self, addr): """Create an instance of a subclass of Protocol.
The returned instance will handle input on an incoming server connection, and an attribute \"factory\" pointing to the creating factory.
Override this method to alter how Protocol instances get created.
@param addr: an object implementing L{twisted.internet.interfaces.IAddress} """ p = self.protocol() p.factory = self return p
ReconnectingClientFactory inherits that method, so each TelnetClient instance it builds will have a self.factory you can use to access your cmd list.
Hope that helps, -- alecu
So, I have this working now. I can send commands to the telnet server, dynamically. However, is there a way to supress the output of the data I get back so it doesn't flood my shell (stdout)?
How about removing the print from dataReceived? :) Jean-Paul
participants (3)
-
Alejandro J. Cura -
Don Smith -
Jean-Paul Calderone