We now keep DNS answers around in a cache for TTL seconds after getting
them the first time. The cache is capped at 256 responses for now.
Suggested by @zecke in #10.
To protect against DNS spoof attacks, we now check that the questions
in incoming responses match the questions in the request we sent out.
Suggested by @zecke in #10.
- Break out request building into a DNSRequest class.
- Break out response parsing into a DNSResponse class.
A DNSRequest contains one or more DNSQuestion objects.
A DNSResponse contains all the DNSQuestions asked, and a DNSAnswer
object for each answer.
If a DNS server responds with multiple answers for a question, we will
get a newline-separated sequence of answers from LookupServer.
However, we don't handle this properly yet in LibC, so just split the
response by line and only care about the first answer for now.
Vector::ensure_capacity() makes sure the underlying vector buffer can
contain all the data, but it doesn't update the Vector::size().
As a result, writev() would simply collect all the buffers to write,
and then do nothing.
It was possible to read uninitialized kernel memory via getsockname().
Of course, kmalloc() is a good boy and scrubs new allocations with 0xBB
so all you got was a bunch of 0xBB.
This implementation uses the new helper method of Bitmap called
find_longest_range_of_unset_bits. This method looks for the biggest
range of contiguous bits unset in the bitmap and returns the start of
the range back to the caller.
We should rename all of these functions to match the real VT100 names.
This will make it 100% easier to work on LibVT.
For reference: https://vt100.net/docs/vt100-ug/
The curious "stomp" state occurs when you type your way all the way
over to the right side of the terminal buffer, and we "stomp" once on
the very last column, before jumping to the next line.
We should never go into "stomp" state in response to programmatically
setting the cursor position. This fixes a small artifact in vttest.
We should use dbg() instead of dbgprintf() as much as possible to
protect ourselves against format string bugs. Here's a bunch of
conversions in Ext2FS.
Move all the fork-specific inheritance logic to sys$fork(), and all the
stuff for setting up stdio for non-fork ring 3 processes moves to
Process::create_user_process().
Also: we were setting up the PGID, SID and umask twice. Also the code
for copying the open file descriptors was overly complicated. Now it's
just a simple Vector copy assignment. :^)
