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POHID report descriptor (with iPhone)
 

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    <p>I am trying to send keystrokes via bluetooth to my iPhone4 from ubuntu. I.e., developing a very primitive virtual keyboard.</p> <p><strong>Problem</strong> Have my application talk to iPhone (i.e. using <strong>report protocol</strong>, that's all iPhone supports). As it is, my <code>write(interruptChannelFD)</code> calls return no errors, but no text appears on iPhone side. The l2cap channels have been opened using blueZ library.</p> <p><strong>Question 1:</strong> Given that no virtual keyboard exists that does that, just how hard is it?</p> <p>I am at the stage where iPhone and my linux box connect and stay connected, no problem. Also, all the <code>perror()</code> calls are telling me that control and interrupt channel sockets connect just fine. (What I do is hciconfig my dongle to Keyboard device class and use the well-known code by <a href="http://www.mulliner.org/bluetooth/hidattack.php" rel="nofollow">Collin Mulliner</a> with slight modification -- I had to enter a passcode once, as all smartphones require).</p> <p><strong>Question 2:</strong> I should be able to just <code>write()</code> into interrupt socket without worrying about encryption, right? I've entered the passcode and the phone trusts the keyboard. (Collin was pondering a possible hid attack, but I connect honestly)</p> <p>Also, it is my understanding that in boot protocol of a HID device, the exact report descriptor specfied in SPD is hardly relevant -- the report format is fixed anyway. So...</p> <p><strong>Question 3:</strong> Do I miss something major about the <strong>report protocol</strong>. What I do is modify the Apple keyboard report descriptor and write into the socket (see below).</p> <pre><code>const uint8_t hid_spec[] = { 0x05, 0x01, // usage page 0x09, 0x06, // keyboard 0xa1, 0x01, // collection (Application) 0x85, 0x01, // report id (0x01) 0x05, 0x07, // usage page(keyboard) 0x19, 0xe0, // usage min 0x29, 0xe7, // usage max 0x15, 0x00, // logical min 0x25, 0x01, // logical max 0x75, 0x01, // report size 0x95, 0x08, // report count 0x81, 0x02, // input (dat var abs) 0x75, 0x08, // report size 0x95, 0x01, // report count 0x81, 0x01, // input (const) // The following two outputs I don't seem to receive 0x75, 0x01, // report size 0x95, 0x05, // report count 0x05, 0x08, // usage page (LEDs) 0x19, 0x01, // usage min 0x29, 0x05, // usage max 0x91, 0x02, // OUTPUT1 (dat var abs) 0x75, 0x03, 0x95, 0x01, 0x91, 0x01, // OUTPUT2 (arr,const) 0x75, 0x08, // report size 0x95, 0x06, // report count 0x15, 0x00, // logical min 0x26, 0xff, 0x00 // logical max 0x05, 0x07 0x19, 0x00 0x2a, 0xff, 0x00, 0x81, 0x00, // A total of 9 bits sent by now // I tried remove the following fields /********** BEGIN SNIP 0x75, 0x01, 0x95, 0x01, 0x15, 0x00, 0x25, 0x01, 0x05, 0x0c, 0x09, 0xb8, 0x81, 0x06, 0x09, 0xe2, 0x81, 0x06, 0x09, 0xe9, 0x81, 0x02, 0x09, 0xea, 0x81, 0x02, 0x75, 0x01, 0x95, 0x04, 0x81, 0x01, **** END SNIP/ 0xc0 // end coll </code></pre> <p>};</p> <p>After this, I write the following 10 bytes into the interrupt channel:</p> <pre><code> pkg[0] = 0xa1; // BT HDR (DATA) pkg[1] = 0x01; // REPORT ID 0x1 == kbd pkg[2] = modifiers; // Ctrl, Shift, etc pkg[3] = 0x00; // constant 0 (see descr) // pkg[4] = 0x00; // the key code - entered before this point, according to HID usage tables. pkg[5] = 0x00; pkg[6] = 0x00; pkg[7] = 0x00; pkg[8] = 0x00; pkg[9] = 0x00; if (write(is, pkg, 10) &lt;= 0) { perror("write"); exit(-1); } </code></pre>
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