Reverse dns not updating do sookie and bill dating in real life
It needs some form of translation to make it happen, and the mechanism that enables that translation is the Domain Name System, or DNS.In the early days when there were only a few hundred nodes, a single text file could easily map host names to their corresponding IP addresses.The early Internet landscape was pretty barren with only a few hundred computers making up the ARPANET, the military/educational precursor to the Internet.Then, as today, each device on the network was a node, and each node needed a unique address to enable data packets to find their destinations.IMPORTANT: Reverse Tethering is suffering from poor ratings on Google Play recently, mostly because people have troubles setting everything up and give bad reviews instead of contacting me, the developer.For a new app like Reverse Tethering, good Play Store ratings are of tremendous importance.
A quick Google for the “xmlset_roodkcableoj28840ybtide” string turns up only a single Russian forum post from a few years ago, which notes that this is an “interesting line” inside the /bin/webs binary. So what is this mystery string getting compared against?
It’s Saturday night, I have no date, a two-liter bottle of Shasta and my all-Rush mix-tape…let’s hack.
On a whim I downloaded firmware v1.13 for the DIR-100 rev A.
If we look back in the call tree, we see that the http_request_t structure pointer is passed around by a few functions: It turns out that the pointer at offset 0x D0 in the http_request_t structure is populated by the httpd_parse_request function: In other words, if your browser’s user agent string is “xmlset_roodkcableoj28840ybtide” (no quotes), you can access the web interface without any authentication and view/change the device settings (a DI-524UP is shown, as I don’t have a DIR-100 and the DI-524UP uses the same firmware): You stay classy, D-Link.
UPDATE: The ever neighborly Travis Goodspeed pointed out that this backdoor is used by the /bin/xmlsetc binary in the D-Link firmware.
Binwalk quickly found and extracted a Squash FS file system, and soon I had the firmware’s web server (/bin/webs) loaded into IDA: Based on the above strings listing, the /bin/webs binary is a modified version of thttpd which provides the administrative interface for the router.