Added support for TLS SNI (#66)

Added support for TLS SNI , assign host value to the socket hostname.

Signed-off-by: Tero Saarni <[email protected]>

Author: tsaarni

CHANGELOG.md

@@ -1,6 +1,7 @@
 ## 3.0.6
   - Change codec instance comparison [#69](https://github.com/logstash-plugins/logstash-output-syslog/pull/69)
   - Added support for RFC5424 structured data [#67](https://github.com/logstash-plugins/logstash-output-syslog/pull/67)
+  - The SNI (Server Name Indication) extension is now used when connecting to syslog server with TLS and `host` is set to FQDN (Fully Qualified Domain Name) [#66](https://github.com/logstash-plugins/logstash-output-syslog/pull/66)
 
 ## 3.0.5
   - Docs: Set the default_codec doc attribute.

lib/logstash/outputs/syslog.rb

@@ -218,6 +218,8 @@ def connect
       socket = TCPSocket.new(@host, @port)
       if ssl?
         socket = OpenSSL::SSL::SSLSocket.new(socket, @ssl_context)
+        # Use SNI extension
+        socket.hostname = @host
         begin
           socket.connect
         rescue OpenSSL::SSL::SSLError => ssle