Added "start" command which creates a local SSH tunnel to a pre-configured server. The connection may then be used as SOCKS proxy within the Mac OSX network settings (and this toggle script)

proxy-toggle.sh

#!/bin/sh
 
SSH_HOST=you@some.server.tld
SSH_PORT=22

PROXY_INTERFACE="Wi-Fi"
PROXY_HOST=localhost
PROXY_PORT=8080

if [[ $1 == "start" ]]; then
    ssh -D $PROXY_PORT -f -C -q -N $SSH_HOST -p$SSH_PORT
    echo "SSH Tunnel created."
    echo "======================================================"
    ps ax | grep $PROXY_PORT | head -n 1
    echo "======================================================"
 
elif [[ $1 == "on" ]]; then
    sudo networksetup -setsocksfirewallproxy "$PROXY_INTERFACE" $PROXY_HOST $PROXY_PORT
    echo "SOCKS proxy enabled"
 
elif [[ $1 == "off" ]]; then
    sudo networksetup -setsocksfirewallproxystate "$PROXY_INTERFACE" off
    echo "SOCKS proxy disabled"
 
elif [[ $1 == "status" ]]; then
    echo "======================================================"
    echo "Network Services:"
    echo "======================================================"
    networksetup -listallnetworkservices
    echo
    echo "======================================================"
    echo "Current SOCKS Proxy Settings:"
    echo "======================================================"
    networksetup -getsocksfirewallproxy "$PROXY_INTERFACE"
    echo
 
else
    echo "`basename $0` toggles SOCKS proxy settings on OS X"
    echo
    echo "Usage: "
    echo "  $ proxy start        # start SSH tunnel to use as SOCKS proxy"
    echo "  $ proxy on           # turns SOCKS proxy on"
    echo "  $ proxy off          # turns SOCKS proxy off"
    echo "  $ proxy status       # prints status of proxy settings"
    echo
    echo "proxy interface:      " $PROXY_INTERFACE
    echo "proxy host:           " $PROXY_HOST
    echo "proxy port:           " $PROXY_PORT
    echo
    exit 65 # end process with error to indicate incorrect arguments
fi

How about adding stop (to destroy the tunnel)? Right now I can just kill the process, but having a stop would be more elegant. It would be great if you could simplify it too, so something like tunnel on and tunnel off will start/stop the tunnel and set proxy on/off.

I have changed my fork to accommodate the above. It works great!