Previously the nc implementation during listening mode would only accept
a single client and close the listening file description immediately.
Additionally, it did not have support for read/write handling of the
accepted client.
This patch extends the functionality of nc's listening capability by
allowing multiple client connections over TCP. Clients/server are able
to pass data back and forth between the connection.
Being able to listen on sockets and accept connections is helpful for
debugging the networking stack.
The POSIX man-page states that inet_pton returns 0 if the input is not a
valid IPv4 dotted-decimal string or a valid IPv6 address string. This is
also how it is implemented in SerenityOS.
This means that we should treat a return value of 0 as an error to avoid
using an invalid address (or 0.0.0.0).
Allow the user to pass in a hostname to the connect functionality
instead of just an ip address. The call to gethostbyname(..) handles
both seamlessly for us.
Update the argument name / usage message accordingly.
SPDX License Identifiers are a more compact / standardized
way of representing file license information.
See: https://spdx.dev/resources/use/#identifiers
This was done with the `ambr` search and replace tool.
ambr --no-parent-ignore --key-from-file --rep-from-file key.txt rep.txt *
There's no point in using different, seemingly randomly sized buffers as
the required size for storing an IPv4 address representation is well
known (16 bytes).
