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Since option 3 is very rare, we will concentrate on the first two. Using a username and password with paramiko is very easy you simply provide them in your call to the connect() method: >>> client.connect('my.example.com', username='brandon', password=mypass) Public-key authentication, where you use ssh-keygen to create an identity key pair (which is typically stored in your ~/.ssh directory) that can be used to authenticate you without a password, makes the Python code even easier! >>> client.connect('my.example.com') If your identity key file is stored somewhere other than in the normal ~/.ssh/id_rsa file, then you can provide its file name or a whole Python list of file names to the connect() method manually: >>> client.connect('my.example.com',

Namespace naming guidelines suggest the following: Start namespace names with the company name. Follow the company name with the technology name. Do not name a namespace with the same name as a class or type. For example, the software development department of the Acme Widget Company develops software in the following three namespaces, as shown in the following code: AcmeWidgets.SuperWidget AcmeWidgets.Media AcmeWidgets.Games namespace AcmeWidgets.SuperWidget.SPDComponent { class SPDBase ... ... }

4. Connect the right connector of the Flickr block to the left connector of the Photo-

key_filename='/home/brandon/.ssh/id_sysadmin')

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There are several other important points you should know about namespaces: Every type name in a namespace must be different from all the others. The types in a namespace are called members of the namespace. A source file can contain any number of namespace declarations, either sequentially or nested. Figure 10-6 shows a source file on the left that declares two namespaces sequentially, with several types in each one. Notice that even though the namespaces contain several class names in common, they are differentiated by their namespace names, as shown in the assembly at the right of the figure.

Of course, per the normal rules of SSH, providing a public-key identity like this will work only if you have appended the public key in the id_sysadmin.pub file to your authorized hosts file on the remote end, typically named something like this: /home/brandon/.ssh/authorized_keys If you have trouble getting public-key authentication to work, always check the file permissions on both your remote .ssh directory and also the files inside; some versions of the SSH server will get upset if they see that these files are group-readable or group-writable. Using mode 0700 for the .ssh directory and 0600 for the files inside will often make SSH happiest. The task of copying SSH keys to other accounts has actually been automated in recent versions, through a small command that will make sure that the file permissions get set correctly for you: ssh-copy-id -i ~/.ssh/id_rsa.pub myaccount@example.com Once the connect() method has succeeded, you are now ready to start performing remote operations, all of which will be forwarded over the same physical socket without requiring re-negotiation of the host key, your identity, or the encryption that protects the SSH socket itself!

Figure 10-6. Multiple namespaces in a source file The .NET Framework BCL offers thousands of defined classes and types to choose from in building your programs. To help organize this array of available functionality, types with related functionality are declared in the same namespace. The BCL uses more than 100 namespaces to organize its types.

Once you have a connected SSH client, the entire world of SSH operations is open to you. Simply by asking, you can access remote-shell sessions, run individual commands, commence file-transfer sessions, and set up port forwarding. We will look at each of these operations in turn. First, SSH can set up a raw shell session for you, running on the remote end inside a pseudoterminal so that programs act like they normally do when they are interacting with the user at a terminal. This kind of connection behaves very much like a Telnet connection; take a look at Listing 16 5 for an example, which pushes a simple echo command at the remote shell, and then asks it to exit. Listing 16 5. Running an Interactive Shell Under SSH #!/usr/bin/env python # Foundations of Python Network Programming - 16 - ssh_simple.py # Using SSH like Telnet: connecting and running two commands import paramiko class AllowAnythingPolicy(paramiko.MissingHostKeyPolicy): def missing_host_key(self, client, hostname, key): return client = paramiko.SSHClient() client.set_missing_host_key_policy(AllowAnythingPolicy()) client.connect('127.0.0.1', username='test') # password='') channel = client.invoke_shell() stdin = channel.makefile('wb') stdout = channel.makefile('rb') stdin.write('echo Hello, world\rexit\r') print stdout.read() client.close()

Sphere block. When you are finished, the design surface should look like Figure 4-5.

You will see that this awkward session bears all of the scars of a program operating over a terminal. Instead of being able to neatly encapsulate each command and separate its arguments in Python, it has to use spaces and carriage returns and trust the remote shell to divide things back up properly.

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