September 2008
Intermediate to advanced
140 pages
3h 31m
English
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Communication
The iPhone can communicate across several different mediums, including the serial port, 802.11 Wi-Fi, and Bluetooth. Due to the limitations of Bluetooth on the iPhone, the two preferred methods are via the serial port and Wi-Fi.
AFC (Apple File Connection) is the serial port protocol used by iTunes to copy files to and from the device and to send firmware-level commands, such as how to boot up and when to enter recovery mode. It is used for everything from copying music to installing a software upgrade. This takes place over the device’s USB dock connector, using a framework named MobileDevice, which gets installed with iTunes. Third-party jailbreak tools sometimes load this framework to perform ad-hoc operations on the iPhone.
Note
A framework is a shared resource used in Mac OS X, similar to a DLL (dynamic linked library) and SO (shared object) in other operating systems. The Windows version of iTunes uses a DLL rather than a framework. For all purposes here, the terms are interchangeable.
By default, iTunes isn’t allowed to access the entire iPhone, but is placed in a jailed environment. A jailed environment is an environment subordinate to the administrative environment of a system, generally imposing additional restrictions on what resources are accessible. In other words, iTunes is permitted to access only certain files on the iPhone—namely those within its jail rooted in the /private/var/mobile/Media folder on the device (or /private/var/root/Media for older versions ...
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