This change introduces new config options
`proxy_enabled` and `proxy_url`
that replace `socks5_*`.
Tested with deltachat-repl
by starting it with
`cargo run --locked -p deltachat-repl -- deltachat-db` and running
```
> set proxy_enabled 1
> set proxy_url ss://...
> setqr dcaccount:https://chatmail.example.org/new
> configure
```
This change replaces
usage of `reqwest` and `hyper-util`
with custom connection establishment code
so it is done in the same way
as for IMAP and SMTP connections.
This way we control HTTP, IMAP and SMTP
connection establishment
and schedule connection attempts
to resolved IP addresses
in the same way for all 3 protocols.
With current implementation
every time connection fails
we take the next delay from `delays` iterator.
In the worst case first 4 DNS results
immediately refuse connection
and we start fifth connection attempt
with 1 year timeout,
effectively continuing all remaining
connection attempts without concurrency.
With new implementation
new connection attempts are
added to `connection_attempt_set`
independently of connection failures
and after 10 seconds
we always end up with five
parallel connection attempts
as long as there are enough IP addresses.
Previously for each connection candidate (essentially host and port
pair) after resolving the host to a list of IPs Delta Chat iterated IP
addresses one by one. Now for IMAP and SMTP we try up to 5 IP addresses
in parallel. We start with one connection and add more connections
later. If some connection fails, e.g. we try to connect to IPv6 on IPv4
network and get "Network is unreachable" (ENETUNREACH) error, we replace
failed connection with another one immediately.
Co-authored-by: Hocuri <hocuri@gmx.de>
Before the fix HTTP client
had no connection timeout,
so it only had a chance
to test one IPv6 and one IPv4
address if the first addresses timed out.
Now it can test at least 4 addresses
of each family and more if some addresses
refuse connection rather than time out.
Apparently some providers fail TLS connection
with "no_application_protocol" alert
even when requesting "imap" protocol for IMAP connection
and "smtp" protocol for SMTP connection.
Fixes <https://github.com/deltachat/deltachat-core-rust/issues/5892>.
Previously Delta Chat tried all DNS resolution results
in sequence until TCP connection is established successfully,
then tried to establish TLS on top of the TCP connection.
If establishing TLS fails, the whole
connection establishment procedure failed
without trying next DNS resolution results.
In particular, in a scenario
where DNS returns incorrect result
pointing e.g. to a server
that listens on the TCP port
but does not have correpsponding TLS certificate,
Delta Chat now will fall back to the cached result
and connect successfully.
For hardcoded built-in DNS results
there is no cache entry in `dns_cache` table
so they cannot be prioritized if DNS resolution
never returned these results yet.
If there is no entry, a new one should be created.
SQL UPSERT does this.
Moved custom ToSql trait including Send + Sync from lib.rs to sql.rs.
Replaced most params! and paramsv! macro usage with tuples.
Replaced paramsv! and params_iterv! with params_slice!,
because there is no need to construct a vector.
async-imap does not do its own buffering, but calls flush() after
sending each command. Using BufWriter reduces the number of write()
system calls used to send a single command.
Note that BufWriter is set up on top of TLS streams, because
we can't guarantee that TLS libraries flush the stream before
waiting for response.
