net.server_epoll: Factor out TLS initialization into a method So there's :startls(), :inittls() and :tlshandshake() :starttls() prepares for plain -> TLS upgrade and ensures that the (unencrypted) write buffer is drained before proceeding. :inittls() wraps the connection and does things like SNI, DANE etc. :tlshandshake() steps the TLS negotiation forward until it completes

net.server_epoll: Fix typo

mod_s2s: Log debug message on attempted close of an connectionless session This should probably never happen, but probably does anyways. A debug message would show the truth of the matter.

mod_s2s: Drop level of indentation by inverting a condition and early return Nicer to get rid of a conditional that covers such a large portion of a pretty big function.

mod_s2s: Use module API to fire events These direct accesses are probably more optimized, but weird when the module API has methods for these things.

scansion tests: Allow specifying network settings via environment variable Allows testing e.g. opportunistic writes or other settings easily in CI or otherwise without editing the config file. make integration-test PROSODY_NETWORK_SETTINGS='{"opportunistic_writes":true}'

scansion tests: Allow specifying network backend via environment variable To make it easier to test select and event without having to edit the config file, e.g. in CI. make integration-test PROSODY_NETWORK_BACKEND=event

net.server_epoll: Prevent stack overflow of opportunistic writes net.http.files serving a big enough file on a fast enough connection with opportunistic_writes enabled could trigger a stack overflow through repeatedly serving more data that immediately gets sent, draining the buffer and triggering more data to be sent. This also blocked the server on a single task until completion or an error. This change prevents nested opportunistic writes, which should prevent the stack overflow, at the cost of reduced download speed, but this is unlikely to be noticeable outside of Gbit networks. Speed at the cost of blocking other processing is not worth it, especially with the risk of stack overflow.

mod_http_errors: Set status code 200 from root page It isn't quite an error.

mod_http_errors: Add a Prosody logo to root page