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#!/bin/sh |
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# Enable exit on error |
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set -e |
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# Function to generate a random number between 49152 and 65535 |
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generate_random_port() { |
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awk -v min=49152 -v max=65535 'BEGIN { srand(); print int(min + rand() * (max - min + 1)) }' |
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} |
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interface="wgc$1" |
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sleep 3 |
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# Log the start of the script |
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logger -t WireGuardClient -p user.notice "Starting junk-udp-hack script" |
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logger -t WireGuardClient -p user.notice "Processing WG interface - $interface" |
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# Retrieve the server and port |
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wg_endpoint=$(wg show "$interface" endpoints 2>/dev/null || echo "") |
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if [ -z "$wg_endpoint" ]; then |
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logger -s -t WireGuardClient -p user.err "Unable to retrieve endpoint for interface $interface" >&2 |
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exit 1 |
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fi |
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wg_server=$(echo "$wg_endpoint" | awk '{print $2}' | cut -d':' -f1 2>/dev/null || echo "") |
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wg_port=$(echo "$wg_endpoint" | awk '{print $2}' | cut -d':' -f2 2>/dev/null || echo "") |
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if [ -z "$wg_server" ] || [ -z "$wg_port" ]; then |
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logger -s -t WireGuardClient -p user.err "Unable to extract server or port for interface $interface" >&2 |
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exit 1 |
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fi |
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# Generate a random message |
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message=$(dd if=/dev/urandom bs=228 count=5 2>/dev/null | tr -dc 'A-Za-z0-9') |
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# Generate a new random port and ensure it's not in use |
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l_port=$(generate_random_port) |
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while netstat -an | grep -qE '(^|[^0-9])'"$l_port"'([^0-9]|$)'; do |
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logger -t WireGuardClient -p user.warn "Port $l_port is already in use. Generating new one" |
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sleep 1 |
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l_port=$(generate_random_port) |
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done |
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logger -t WireGuardClient -p user.notice "Setting connection to WG server $wg_server:$wg_port from client's port $l_port" |
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# Send the message using socat |
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echo "$message" | socat - UDP-SENDTO:"$wg_server:$wg_port",sourceport="$l_port" |
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# Update the WireGuard interface with the new listen port |
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wg set "$interface" listen-port "$l_port" |
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logger -t WireGuardClient -p user.notice "Done" |
