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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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. _ RETR 1 +OK Here it comes... <e-mail text> . _ DELE 1 +OK Message deleted. _ QUIT +OK vienna01 Server closing down. As you can see in this connection trace, the client authenticates itself at the server by sending the commands USER username and PASS password. In this case the password is transported in clear text over the network. Most POP3 servers also support an APOP command based on an MD5 digest that incorporates a server-side timestamp to disable replay attacks. You can read more about this in RFC1939. The server then replies with a message like +OK Welcome! 1 messages (231 bytes). You should never try to parse this reply to receive the message count; instead, either send the command STAT, which will be answered by +OK number_of_messages total_bytes or issue a LIST command, which will first return +OK message and then return this line once for each message: message_number bytes. The reply concludes with a <CR><LF><DOT><CR><LF> sequence. The client can then issue a RETR message_number command to retrieve the content of a specific message (with a final <CR><LF><DOT><CR><LF> as well) and a DELE message_number statement to delete it at the server. This deletion is only carried out after sending QUIT to the server, which then closes the connection.
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After reading the last few pages, you are almost fully equipped to start with the design of your channel. The last thing you need to know before you can start to write some code is how the resulting e-mail has to look. Because there s no standard for the binding of .NET Remoting to custom transfer protocols, I just elected Simon Fell s recommendation for SOAP binding to SMTP as the target specification for this implementation. You can find the latest version of this document at http:// www.pocketsoap.com/specs/smtpbinding/. In essence, it basically says that the content has to be either Base64 or Quoted-Printable encoded and needs to supply a given number of e-mail headers. So, what does this mean Essentially, the e-mail format we know today was designed ages ago when memory was expensive, WAN links were slow, and computers liked to deal with 7-bit ASCII characters. Nowadays we instead use Unicode, which allows us to have huge numbers of characters so that even languages like Japanese, Chinese, or Korean can be encoded. This is, of course, far from 7 bit, so you have to find a way to bring such data back to a 7-bit format of printable characters. Base64 does this for you; it is described in detail in section 5.2 of RFC1521, available at http:// www.ietf.org/rfc/rfc1521.txt. To encode a given byte array with the Base64 algorithm, you can use Convert.ToBase64String().
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CHAPTER 14 DEVELOPING A TRANSPORT CHANNEL
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An e-mail contains not only the body, but also header information. For a sample SOAP-via-SMTP request, the complete e-mail might look like this: From: client_1@localhost To: server_1@localhost Message-Id: <26fc4f4cd8de4567a66ccea6897dc481@REMOTING> MIME-Version: 1.0 Content-Type: text/xml; charset=utf-8 Content-Transfer-Encoding: BASE64 ...encoded SOAP request here... To match a response message to the correct request, the value of the Message-Id header will be included in the In-Reply-To header of the response message. From: server_1@localhost To: client_1@localhost Message-Id: <97809278530983552398576545869067@REMOTING> In-Reply-To: <26fc4f4cd8de4567a66ccea6897dc481@REMOTING> MIME-Version: 1.0 Content-Type: text/xml; charset=utf-8 Content-Transfer-Encoding: BASE64 ...encoded SOAP response here... You also need to include some special headers that are taken from the ITransportHeaders object of the .NET Remoting request. Those will be preceded by X-REMOTING- so that a complete remoting request e-mail might look like this: From: client_1@localhost To: server_1@localhost Message-Id: <26fc4f4cd8de4567a66ccea6897dc481@REMOTING> MIME-Version: 1.0 Content-Type: text/xml; charset=utf-8 Content-Transfer-Encoding: BASE64 X-REMOTING-Content-Type: text/xml; charset="utf-8" X-REMOTING-SOAPAction: "http://schemas.microsoft.com/clr/ns/System.Runtime .Remoting.Activation.IActivator#Activate" X-REMOTING-URI: /RemoteActivationService.rem ...encoded .NET Remoting request here... The encoded .NET Remoting request itself can be based on either the binary formatter or SOAP!
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