Geolocates strangers on Omegle, Chatroulette and similar sites. Tested on OS X 10.10.5 and Ubuntu 16.04.

UDPGeolocate.sh

#!/bin/bash

# Real-time UDP IP Geolocator
printf "### REAL-TIME UDP IP GEOLOCATOR ###\n"
printf "===================================\n"

# Query user options
read -p "Please enter the interface on which to listen for connections (Default: Detection by script): " interface
read -p "Please enter the minimum packet size which should trigger a frame recording (Default: 200): " minPackLen
read -p "Please enter the UDP port number on which to listen for connections (Default: Detection by script (follow instructions later on in config!)): " port
read -p "Please enter the minimum timeout between each capture in seconds (Default: 1 second): " timeout

# Set defaults if setting skipped
if [[ -z "$interface" ]]; then
    # Use netstat to guess active interface
    interface=`netstat -rn | grep '^default' | grep -o '[^ ]*$'`
    if [[ -z "$interface" ]]; then
        interface=`netstat -rn | grep '^0.0.0.0' | grep -o '[^ ]*$'`
    fi
    printf "[DBG]: Detected interface: $interface\n"
fi
if [[ -z "$minPackLen" ]]; then
    minPackLen=200
fi
if [[ -z "$port" ]]; then
    read -p "Please start the service, make sure that it's running, turn off the webcam and mic, and press enter to continue. The UDP packets will be probed for 5 seconds, and the most common destination port will be assumed as the one to use."
    # Probe UDP packets for given number of seconds
    secs=5
    endTime=$(( $(date +%s) + secs ))

    while [[ $(date +%s) -lt $endTime ]]; do
        # Probe outgoing packets for udp port
        curPort=`tcpdump -n -c 1 -i $interface udp and greater $minPackLen 2>/dev/null | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]*' | cut -d . -f 5 | tail -1`
        if ! [[ -z "$curPort" ]]; then
            (( ports[$curPort]++ ))
        fi
        printf "[DBG]: Sampled UDP packet on port $curPort\n"
    done
    # Determine most likely port to listen on
    port=0
    portCount=0
    for i in "${!ports[@]}"; do
        if [[ ${ports[$i]} -gt $portCount ]]; then
            port=$i
            portCount=${ports[$i]}
            printf "[DBG]: Port $port with $portCount occurrences is the new candidate port\n"
        fi
        printf "[DBG]: Most likely port: $port\n"
    done
fi
if [[ -z "$timeout" ]]; then
    timeout=1
fi

# Initially, set old IP to arbitrary value (new one will be different)
oldIp="0.0.0.0"

# Start listening
while true
# Grab frame's IP address
do
    # Notify of acquisition
    printf "Capturing UDP packet on port $port...\n"
    ip=`tcpdump -n -c 1 -i $interface udp src port $port and greater $minPackLen 2>/dev/null | grep -Eo '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | tail -1`
    if ! [[ -z $ip ]]; then
        printf "[DBG]: Successfully grabbed IP: $ip\n"
    else
        printf "[DBG]: Failed to grab IP\n"
    fi

    # Smart re-querying to prevent excessive queries on API
    if ! [[ $oldIp = $ip ]]; then
        # First check if IP is TOR exit node, if yes, do not query Geolocation API
        printf "[DBG]: Checking if IP is in TorDNSEL list of current exit nodes\n"
        torMatch=`curl -s https://check.torproject.org/exit-addresses | grep -F $ip`
        if [[ -z $torMatch ]]; then
            # Query geolocation API
            printf "[DBG]: Querying Geolocation API with query: http://ip-api.com/json/$ip\n"
            json=`curl -s http://ip-api.com/json/$ip`
            if ! [[ -z $json ]]; then
                output=`python -c "import sys, json; data = json.loads('$json'); print json.dumps(data, indent=4, ensure_ascii=False).encode('utf8')"`
            else
                output='No response received from Geolocation API'
            fi
            # Output result
            printf "$output\n"
            printf "===================================\n\n"
        else
            printf "IP is Tor exit node. Not querying geolocation API\n"
            printf "[DBG]: Matched Tor exit node: $torMatch\n";
        fi

        # Set old IP to current IP
        oldIp=$ip
    else
        printf "[DBG]: Current IP identical to old IP, not re-querying geolocation API\n"
    fi

    # Timeout
    sleep $timeout
done