TLS

• Linux, FreeBSD and Android builds are based on OpenSSL 3.4.0
• i686-unknown-linux-musl does not have TLS support
• Mac and Windows builds should use native TLS support

Documentation

• Websocat4 documentation - it describes some unreleased things too, not only that in 4.0.0-alpha2.
• doc.md is a documentation specifically for 4.0.0-alpha2.

Changelog

Comparing to v4.0.0-alpha1, Websocat4 gained:

ported from Websocat1

• --oneshot to serve just one connection
• protection from excessively large messages that may overflow memory (it works not the same as in Websocat1 though)
• random: endpoint
• lengthprefixed: overlay
• --inhibit-pongs
• --stdout-announce-listening-ports
• Ability to inherit socket listeners and other async FDs from parent process, e.g. SystemD
• reuse-raw:
• readfile:, writefile:, appendfile: (with some additional features for writefile:)
• --origin, --ua, -0 helpers

#276 tracks progress of the porting and can sometimes serve as a migration guide.

new

• --exec-dup2 and --exec-dup2-execve to connect sockets (not WebSockets, though) obtained by Websocat4 directly to the process
• --random-seed
• Additional features for lengthprefixed: mode.
• --global-timeout-ms, --sleep-ms-before-start
• --exec-after-listen (variation of --stdout-announce-listening-ports)
• --compose mode to combine multiple Websocat invocations into one using special arithmetic.
• mock_stream_socket: to use Websocat for testing things (or test Websocat itself).
• "Registry"-based connections within Websocat (for tests and --compose mode)