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This sockopt gives you a struct with the PID, UID and GID of a socket's
peer process.
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Asking a File if we could possibly read or write it will never mutate
the asking FileDescription&, so it should be const.
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This allows userspace programs to get and set (superuser-only) the IPv4
address of a network adapter. :^)
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Made getsockopt() and setsockopt() virtual so we can handle them in the
various Socket subclasses. The subclasses map kinda nicely to "levels".
This will allow us to implement things like "traceroute", although..
I spent some time trying to do that, but then hit a wall when it turned
out that the user-mode networking in QEMU doesn't preserve TTL in the
ICMP packets passing through.
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- IPv4SocketHandle => SocketHandle<IPv4Socket>
- TCPSocketHandle => SocketHandle<TCPSocket>
- UDPSocketHandle => SocketHandle<UDPSocket>
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This has several significant changes to the networking stack.
* Significant refactoring of the TCP state machine. Right now it's
probably more fragile than it used to be, but handles quite a lot
more of the handshake process.
* `TCPSocket` holds a `NetworkAdapter*`, assigned during `connect()` or
`bind()`, whichever comes first.
* `listen()` is now virtual in `Socket` and intended to be implemented
in its child classes
* `listen()` no longer works without `bind()` - this is a bit of a
regression, but listening sockets didn't work at all before, so it's
not possible to observe the regression.
* A file is exposed at `/proc/net_tcp`, which is a JSON document listing
the current TCP sockets with a bit of metadata.
* There's an `ETHERNET_VERY_DEBUG` flag for dumping packet's content out
to `kprintf`. It is, indeed, _very debug_.
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A KBuffer always contains a valid KBufferImpl. If you need a "null"
state buffer, use Optional<KBuffer>.
This makes KBuffer very easy to work with and pass around, just like
ByteBuffer before it.
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The situations in IPv4Socket and LocalSocket were mirrors of each other
where one had implemented read/write as wrappers and the other had
sendto/recvfrom as wrappers.
Instead of this silliness, move read and write up to the Socket base.
Then mark them final, so subclasses have no choice but to implement
sendto and recvfrom.
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This drastically reduces the pressure on the kernel heap when receiving
data from IPv4 sockets.
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I thought I had included these in the previous commit, but it turns out
I hadn't, duh.
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These types can be picked up by including <AK/Types.h>:
* u8, u16, u32, u64 (unsigned)
* i8, i16, i32, i64 (signed)
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After reading a bunch of POSIX specs, I've learned that a file descriptor
is the number that refers to a file description, not the description itself.
So this patch renames FileDescriptor to FileDescription, and Process now has
FileDescription* file_description(int fd).
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Also run it across the whole tree to get everything using the One True Style.
We don't yet run this in an automated fashion as it's a little slow, but
there is a snippet to do so in makeall.sh.
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We were copying the raw IPv4 addresses into the wrong part of sockaddr_in,
and we didn't set sa_family or sa_port.
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It was way too ambiguous who's the source and who's the destination, and it
didn't really follow a logical pattern. "Local port" vs "Peer port" is super
obvious, so let's call it that.
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We need the address/port to fill in the out-params in recvfrom().
It should now be more or less possible to create a UDP server. :^)
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We can't accept connections just yet, but this patch makes it possible to
bind() to a given source address/port.
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Make the Socket functions take a FileDescriptor& rather than a socket role
throughout the code. Also change threads to block on a FileDescriptor,
rather than either an fd index or a Socket.
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If connect() is called on a non-blocking socket, it will "fail" immediately
with -EINPROGRESS. After that, you select() on the socket and wait for it to
become writable.
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