Log Message:
net/sslh: update to 1.21

v1.21

Added TCP_FASTOPEN support for client sockets (if tfo_ok is
specified in their configuration) and for listenint socket,
if all client protocols support it.  (Craig Andrews)

Added 'minlength' option to skip a probe if less
than that many bytes have been received (mostly for
regex)

Moved configuration and command-line management to
use conf2struct. Hopefully this should be transparent
to users.

Update Let's Encrypt entry in example.cfg for tls-alpn-01
challenges; tls-sni-* challenges are now deprecated.

Log to syslog even if in foreground (for people who
use fail2ban)

Use syslog_facility: "none" to disable syslog
output.

v1.21b

Added TCP_FASTOPEN support for client sockets (if tfo_ok is specified
in their configuration) and for listenint socket, if all client
protocols support it.  (Craig Andrews)

Added 'minlength' option to skip a probe if less than that many bytes
have been received (mostly for regex)

Moved configuration and command-line management to use conf2struct.
Changes are:
* command line option <-F|--config> no longer defaults to /etc/sslh.cfg,
so you have to specify it explicitly.
* command line option <-v|--verbose> takes a mandatory integer parameter

Update Let's Encrypt entry in example.cfg for tls-alpn-01 challenges;
tls-sni-* challenges are now deprecated.

Log to syslog even if in foreground (for people who use fail2ban)

Use syslog_facility: "none" to disable syslog output.

Changed exit code for illegal command line parameter from 1 to 6 (for
testing purposes)

v1.21c

Removed support for 'ssl' and fix a related segfault bug.
(use tls instead of ssl)