Something

stunnel 3.26 on i386-pc-linux-gnu PTHREAD+LIBWRAP with OpenSSL 0.9.7e 25 Oct 2004

Default behaviour:
        run in inetd mode (unless -d used)
        run in background (unless -f used)
        run in ssl server mode (unless -c used)

Compile time defaults:
        -v level        no verify
        -a directory    /etc/ssl/certs
        -A file         (none)
        -S sources      3
        -t timeout      300 seconds
        -B bytes        64
        -D level        5
        -P pid dir      /var/run/stunnel/
        -p pemfile      in server mode: /etc/ssl/certs/stunnel.pem
                        in client mode: none

Socket option defaults:
        Option          Accept    Local     Remote    OS default
        SO_DEBUG            --        --        --             0
        SO_DONTROUTE        --        --        --             0
        SO_KEEPALIVE        --        --        --             0
        SO_LINGER           --        --        --    0:0
        SO_OOBINLINE        --        --        --             0
        SO_RCVBUF           --        --        --         87380
        SO_SNDBUF           --        --        --         16384
        SO_RCVLOWAT         --        --        --             1
        SO_SNDLOWAT         --        --        --             1
        SO_RCVTIMEO         --        --        --         0:0
        SO_SNDTIMEO         --        --        --         0:0
        SO_REUSEADDR             1    --        --             0
        SO_BINDTODEVICE     --        --        --        --
        IP_TOS              --        --        --             0
        IP_TTL              --        --        --            64
        TCP_NODELAY         --        --        --             0