Hacking Gmail

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220 Part III — Conquering Gmail Representing All of This in E-Mail But lest you forget, you’re trying to represent all of this data in e-mail messages and not a proper storage medium. The translation between the two is the job of FUSE and GmailFS. Together, they handle the requests from the operating system for the data inside the directories, the inodes, and then the datablocks, and feed it back in the manner that the kernel expects. To do that, GmailFS needs to store all of these different types of data within the framework that e-mail provides. Think on this: What is the framework available for data within e-mail? It’s easy, actually. You can use the subject line, the body of the message itself, and any number of attachments. That is how GmailFS works. The Actual Data in Action GmailFS just uses the subject line and the attachments. Nothing is held in the message body itself. There are three types of messages used. Directory and file entry messages: These hold the parent path and name of a file or a directory. The subject of these messages has a reference to the file’s or directory’s inode. Inode messages: The subject line of these messages holds the information found in an inode. Datablock messages: These messages hold the file’s data in attachments. The subject of the messages holding these structures contains a reference to the file’s inode as well as the current block number. Because Gmail has a size limit of 5MB for attachments, this message may contain more than one attachment. So, now when you run the cat supersecretpasswords.txt command on a file within the GmailFS system, FUSE and the GmailFS script first use Libgmail to request the corresponding file entry message. This command points them to the inode message, which then points them to the datablock message and the data you need. As previously mentioned in a sidebar, each of the messages’ subject lines contains the file system name. This allows you to use more than one file system off the same Gmail account, and also provides some security. The security comes from the way that GmailFS adds data to itself — by sending mail to itself. Without the hard-to-guess file system name, it would be possible for an outside party to send messages to the account that added data to the file system.
Chapter 16 — Using GmailFS 221 And Now . . . And so, the end is near. In this chapter, you’ve looked at how file systems work, and how Gmail can be used as such. Doing so allows you to host large amounts of files and applications “out there” on the Internet, with only the tiny GmailFS application needed to access it. You can, for example, carry the GmailFS application around on a so-cheap-it’s-free thumbdrive and then have gigabytes of data waiting on Gmail accounts. You can even, if you’re feeling very, very, very geeky, save a browser to a GmailFS drive, and check your Gmail via the browser hosting on the same account. Ah, it’s all too much for me, and so, with that, we come to the end.
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Hacking Gmail Ben Hammersley
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Hacking Gmail Ben Hammersley
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Meanwhile, back in Florence, Anna,
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Credits Executive Editor Chris Webb
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Contents Acknowledgments . . . . .
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Contents xiii Chapter 7: Gmail Libr
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Contents xv How GmailFS Works . . .
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Introduction Welcome to Hacking Gma
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Hacking Gmail
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Desktop Integration chapter The fir
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Chapter 1 — Desktop Integration 5
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12 Part I — Starting to Use Gmail
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Skinning Gmail chapter Being a web-
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How Gmail Works chapter By now you
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Gmail Libraries chapter In the prev
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Checking for Mail chapter Now that
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Sending Mail chapter Now that you k
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Conquering Gmail part You’re the
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Index SYMBOLS backslash (/) keyboar
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Index ■ F-G 277 fstab, mounting G
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Index ■ H-L 279 overview, 186-188
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Index ■ L-M 281 Mail::Webmail::Gm
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Index ■ P-S 283 j key, 18 k key,
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