One machine being server AND client with STunnel

Question

I know that STunnel can be set up as either server or client with the "client = no" or "client = yes" lines in the config file. Is there a way for a machine to be BOTH a server and client?

Answer 1

You can specify the configuration file path on the command line, see stunnel(8).

Answer 2

Stunnel Client Configurations

[client]
client = yes
accept = 7777
connect = 127.0.0.1:7777

"accept" will act as server
"connect" will act as client

Stunnel Server Configurations

[server]
accept = 7777
connect = 127.0.0.1:7777

"accept" will act as client
"connect" will act as server

Answer 3

As /etc/stunnel/README file says,

"Files found under the /etc/stunnel directory that end with .conf are used by stunnel4 service as configuration files, and each will be used to start a daemon process setting up a tunnel with the given configuration..."

I assume you can keep 2 separate config files there: one for server and another one for client. Than you'll have 2 daemons started. You can find config file examples in a file /usr/share/doc/stunnel4/examples/stunnel.conf-sample

Answer 4

It is much easier you can simply You just have to set client=no under the [] (service) where stunnel works as a server and client=yes otherwise. You should also put service specific parameters like certificates where they belong.

Something like:

[server1]
..
client=no

[client1]
..
client=yes