Block BitTorrent via iptabls.

block_bittorrent.sh

#!/usr/bin/env bash
echo "Applying Torrent blocking rules..."
# Block Torrent algo string using Boyer-Moore (bm)
BLOCK_STRINGS_BM=(
    "BitTorrent"
    "BitTorrent protocol"
    "peer_id="
    ".torrent"
    "announce.php?passkey="
    "torrent"
    "announce"
    "info_hash"
    "/default.ida?"
    ".exe?/c+dir"
    ".exe?/c_tftp"
)

# Block Torrent keys using Knuth-Morris-Pratt (kmp)
BLOCK_STRINGS_KMP=(
    "peer_id"
    "BitTorrent"
    "BitTorrent protocol"
    "bittorrent-announce"
    "announce.php?passkey="
    "find_node"
    "info_hash"
    "get_peers"
    "announce"
    "announce_peers"
)

# Apply rules for Boyer-Moore algorithm
for STRING in "${BLOCK_STRINGS_BM[@]}"; do
    echo "Blocking (BM): $STRING"
    iptables -A FORWARD -m string --algo bm --string "$STRING" -j DROP
done

# Apply rules for Knuth-Morris-Pratt algorithm
for STRING in "${BLOCK_STRINGS_KMP[@]}"; do
    echo "Blocking (KMP): $STRING"
    iptables -A FORWARD -m string --algo kmp --string "$STRING" -j DROP
done

echo "All BitTorrent blocking rules applied successfully!"