sslh: Add support for external config file

This allows users to use an external config file if required (for
example matching packets based on SNI hostname or REGEX patterns).

Signed-off-by: Jonathan McCrohan <jmccrohan@gmail.com>
Signed-off-by: Mircea Horea IONICĂ <mionica@gmail.com>

net/sslh/patches/002-configfile-fix.patch

@@ -0,0 +1,32 @@
+diff --git a/basic.cfg b/basic.cfg
+index 54a799c..d938767 100644
+--- a/basic.cfg
++++ b/basic.cfg
+@@ -1,3 +1,7 @@
++# **** Attention OpenWRT/LEDE Users ****
++# sslh command line arguments override arguments defined in this
++# configuration file (UCI uses command line arguments)
++
+ # This is a basic configuration file that should provide
+ # sensible values for "standard" setup.
+ 
+@@ -14,15 +18,16 @@ pidfile: "/var/run/sslh.pid";
+ # Change hostname with your external address name.
+ listen:
+ (
+-    { host: "thelonious"; port: "443"; }
++    { host: "0.0.0.0"; port: "443"; },
++    { host: "[::]"; port: "443"; }
+ );
+ 
+ protocols:
+ (
+      { name: "ssh"; service: "ssh"; host: "localhost"; port: "22"; },
+      { name: "openvpn"; host: "localhost"; port: "1194"; },
+-     { name: "xmpp"; host: "localhost"; port: "5222"; },
+-     { name: "http"; host: "localhost"; port: "80"; },
++#    { name: "xmpp"; host: "localhost"; port: "5222"; },
++#    { name: "http"; host: "localhost"; port: "80"; },
+      { name: "ssl"; host: "localhost"; port: "443"; log_level: 0; },
+      { name: "anyprot"; host: "localhost"; port: "443"; }
+ );