Opens a quick SOCKS5 tunnel over Tor, starts Tor, and configures OSX to use the proxy

tor-proxy.command

#!/bin/bash

# activate debugging
#set -x

# fail on any errors
set -e

INTERFACE=Wi-Fi 
HOST=127.0.0.1
PORT=9050


##################################
##### DO NOT EDIT BELOW HERE #####
##################################

TOR_ALREADY_RUNNING=0
TOR_SERVICE_CHECK_OUTPUT=$(brew services list | (grep "tor\s*started" || echo ""))
[ -n "${TOR_SERVICE_CHECK_OUTPUT}" ] && TOR_ALREADY_RUNNING=1


# Ask for the administrator password upfront
sudo -v 


function disable_proxy() { 
    echo -n "$(tput setaf 136)" # orange
    echo "Disabling SOCKS proxy..."
    sudo networksetup -setsocksfirewallproxystate $INTERFACE off 
    echo -n "$(tput setaf 64)" #green 
    echo "SOCKS proxy disabled."

    if [[ $TOR_ALREADY_RUNNING -eq 0 ]]; then
        echo -n "$(tput setaf 136)" # orange
        echo "Stopping Tor..."
        brew services stop tor 
        echo -n "$(tput setaf 64)" #green 
        echo "Stopped Tor."
    else
        echo -n "$(tput setaf 136)" # orange
        #echo "-- At Launch --"
        #echo "${TOR_SERVICE_CHECK_OUTPUT}"
        #echo "-- Now --"
        #brew services list | egrep "tor\s+started"
        echo "Tor was previously running so not stopping it."    
    fi

    echo -n "$(tput sgr0)" # color reset
    exit 0
}

#This function is used to cleanly exit any script. It does this displaying a
# given error message, and exiting with an error code.
function error_exit {
    echo -n "$(tput setaf 1)" # red
    echo "$@"
    echo -n "$(tput sgr0)" # color reset
    disable_proxy
    exit 1
}
#Trap the killer signals so that we can exit with a good message.
trap "error_exit 'Received signal SIGHUP'" SIGHUP
trap "error_exit 'Received signal SIGINT'" SIGINT
trap "error_exit 'Received signal SIGTERM'" SIGTERM
trap "error_exit 'Received signal SIGKILL'" SIGKILL
trap "error_exit 'Received signal ERR'" ERR

#Alias the function so that it will print a message with the following format:
#prog-name(@line#): message
#We have to explicitly allow aliases, we do this because they make calling the
#function much easier (see example).
shopt -s expand_aliases
alias die='error_exit "Error ${0}(@`echo $(( $LINENO - 1 ))`):"'

 # Let's roll
 
 
echo -n "$(tput setaf 136)" # orange
echo "Enabling SOCKS proxy..."
sudo networksetup -setsocksfirewallproxy $INTERFACE $HOST $PORT 
sudo networksetup -setsocksfirewallproxystate $INTERFACE on 
echo -n "$(tput setaf 64)" # green
echo "SOCKS proxy $HOST:$PORT enabled."

if [[ $TOR_ALREADY_RUNNING -eq 0 ]]; then
    echo -n "$(tput setaf 136)" # orange
    echo "Starting Tor..."
    brew services start tor 
    echo -n "$(tput setaf 64)" # green
    echo "Tor started."
else
    echo -n "$(tput setaf 136)" # orange
    echo "Existing Tor service is already running. We will not attempt to start it."
    #echo "${TOR_SERVICE_CHECK_OUTPUT}"
fi
echo -n "$(tput setaf 64)" # green
echo "Tor is running."
    
echo -n "$(tput sgr0)" # color reset 


# Keep-alive: update existing `sudo` time stamp until finished
while read -n1; do 
    sleep 1
done 2>/dev/null # trap ctrl-c and call disable_proxy()