Linux Networking in .NET

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15 Linux Networking
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You can use Telnet for more than just a virtual terminal, however. We mentioned using telnet to test services that you have configured. Telnet provides a virtual terminal that opens a TCP connection to a specific port. This connection will print whatever text it is sent from the server (in this case, the Telnet server) and will send any data you type into the remote server. Quite a few services work on this notion of sending their data in plain text form for their protocol. The two main candidates are Hypertext Transfer Protocol (HTTP) and Simple Mail Transport Protocol (SMTP). To see a rundown of the SMTP protocol, we will log into the mail server on our local machine and will send a test mail (see Listing 15-9).
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Listing 15-9: Using telnet as a Protocol Tester
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bible:~ # telnet localhost smtp Trying Connected to localhost. Escape character is ^] . 220 ESMTP Postfix ehlo localhost 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250 8BITMIME mail from: justin@bible 250 Ok rcpt to: 250 Ok data 354 End data with <CR><LF>.<CR><LF> This is a test mail that I am sending you. Justin . 250 Ok: queued as 6D5CF18490
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We have used the SMTP protocol to specify that we are sending a mail to the user from the user justin@bible from the machine localhost (ehlo localhost). This is a standard SMTP protocol transaction that can be used to quickly test an SMTP server s ability to send mail to a specific user.
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CrossReference We discuss mail servers and a further example of using Telnet to test a service in 17.
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The command line used, telnet localhost smtp, is the same command line used previously with the addition of the port specification (smtp). The port you connect to can either be in text form (as we used) or in numerical form. The port number for the SMTP protocol is port 25.
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Part III Using the Command Line in SUSE Linux
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From now on in the book, we will refer to TCP/IP ports more and more. A TCP/IP port can be thought of as a virtual plug that serves a specific purpose. Each port has a unique number and a number of well-known port numbers have been reserved for specific purposes. For example, port 80 is HTTP, port 25 is SMTP, and port 21 is FTP. View the file /etc/services for more information on what the well-known port numbers are.
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If security is a concern for your organization, then Telnet should not be used to transmit sensitive information. As all information is plain text, it just is not safe.
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Using SSH
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SSH can be initially thought of as a secure extension to Telnet. It provides virtual terminal services that are encrypted to the user; this includes encrypting the password that the user sends to the server. SSH, however, is actually a suite of technologies that provide not only virtual terminal services, but also file transfer and tunneling services that prove extremely useful. Here we will talk initially about the virtual terminal side of SSH and then move onto public/private key use and tunneling data through an SSH secure tunnel.
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Like its poorer cousin, the prime use of SSH is to log in securely to servers. SSH does not provide you with a login and password prompt as Telnet does. SSH partakes in the user authentication process when the connection is being negotiated (you will see why later). Because of this, SSH needs to know the username you wish to connect to the server as before it attempts a connection. If you just SSH to a remote server, the SSH client will assume you want to connect to the server as your current userid (see Listing 15-10).
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