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| 1 | +#!/usr/bin/env bash |
| 2 | + |
| 3 | +set -euo pipefail |
| 4 | + |
| 5 | +# ─── Colors ─────────────────────────────────────────────────────────────────── |
| 6 | +RED='\033[0;31m' |
| 7 | +GRN='\033[0;32m' |
| 8 | +YEL='\033[1;33m' |
| 9 | +CYN='\033[0;36m' |
| 10 | +RST='\033[0m' |
| 11 | + |
| 12 | +# ─── Usage ──────────────────────────────────────────────────────────────────── |
| 13 | +usage() { |
| 14 | + echo -e "\ |
| 15 | +${YEL}Usage:${RST} |
| 16 | + $(basename "$0") <TIMEOUT> <IP> <PORT> [RESOLVE_FLAG] [THREADS] |
| 17 | +
|
| 18 | +${CYN}Arguments:${RST} |
| 19 | + TIMEOUT Connection timeout in seconds (integer) |
| 20 | + IP Target host(s) — accepts: |
| 21 | + • Single IP/hostname 192.168.1.1 / host.example.com |
| 22 | + • Comma-separated list 192.168.1.1,192.168.1.2 |
| 23 | + • CIDR notation 192.168.1.0/24 |
| 24 | + • IP range (dash) 10.0.0.1-10.0.0.20 |
| 25 | + • Short range 192.168.1.1-20 |
| 26 | + • File (one target per line) /path/to/hosts.txt |
| 27 | + PORT Target port(s) — accepts: |
| 28 | + • Single port 80 |
| 29 | + • Comma-separated 22,80,443 |
| 30 | + • Range (dash) 20-25 |
| 31 | + RESOLVE (optional) 'r' or 'resolve' — omit -n from nc to enable DNS resolution |
| 32 | + THREADS (optional) Number of parallel jobs (requires GNU parallel) |
| 33 | +
|
| 34 | +${CYN}Examples:${RST} |
| 35 | + $(basename "$0") 3 192.168.1.1 22 |
| 36 | + $(basename "$0") 3 192.168.1.0/24 80,443 r 50 |
| 37 | + $(basename "$0") 3 targets.txt 22-25 resolve 20" |
| 38 | + exit 1 |
| 39 | +} |
| 40 | + |
| 41 | +# ─── Argument validation ───────────────────────────────────────────────────── |
| 42 | +[[ $# -lt 3 ]] && usage |
| 43 | + |
| 44 | +TIMEOUT="$1" |
| 45 | +IP_ARG="$2" |
| 46 | +PORT_ARG="$3" |
| 47 | +RESOLVE_FLAG="${4:-}" |
| 48 | +THREADS="${5:-}" |
| 49 | + |
| 50 | +# Validate timeout |
| 51 | +if ! [[ "$TIMEOUT" =~ ^[0-9]+$ ]]; then |
| 52 | + echo -e "${RED}[!] Error: TIMEOUT must be a positive integer.${RST}" >&2 |
| 53 | + exit 1 |
| 54 | +fi |
| 55 | + |
| 56 | +# Validate resolve flag |
| 57 | +RESOLVE=false |
| 58 | +if [[ "${RESOLVE_FLAG,,}" == "r" || "${RESOLVE_FLAG,,}" == "resolve" ]]; then |
| 59 | + RESOLVE=true |
| 60 | +elif [[ -n "$RESOLVE_FLAG" && "$RESOLVE_FLAG" =~ ^[0-9]+$ && -z "$THREADS" ]]; then |
| 61 | + # User skipped resolve flag and passed threads as 4th arg |
| 62 | + THREADS="$RESOLVE_FLAG" |
| 63 | +elif [[ -n "$RESOLVE_FLAG" && ! "$RESOLVE_FLAG" =~ ^[0-9]+$ ]]; then |
| 64 | + echo -e "${RED}[!] Error: Unrecognised RESOLVE flag '${RESOLVE_FLAG}'. Use 'r', 'resolve', or leave empty.${RST}" >&2 |
| 65 | + exit 1 |
| 66 | +fi |
| 67 | + |
| 68 | +# Validate threads |
| 69 | +if [[ -n "$THREADS" ]]; then |
| 70 | + if ! [[ "$THREADS" =~ ^[0-9]+$ ]] || [[ "$THREADS" -eq 0 ]]; then |
| 71 | + echo -e "${RED}[!] Error: THREADS must be a positive integer.${RST}" >&2 |
| 72 | + exit 1 |
| 73 | + fi |
| 74 | + if ! command -v parallel &>/dev/null; then |
| 75 | + echo -e "${RED}[!] Error: GNU parallel is required when THREADS is specified.${RST}" >&2 |
| 76 | + echo -e "${YEL} Install: sudo apt install parallel / brew install parallel${RST}" >&2 |
| 77 | + exit 1 |
| 78 | + fi |
| 79 | +fi |
| 80 | + |
| 81 | +# ─── Dependency check ──────────────────────────────────────────────────────── |
| 82 | +if ! command -v nc &>/dev/null; then |
| 83 | + echo -e "${RED}[!] Missing dependency: nc (netcat)${RST}" >&2 |
| 84 | + echo -e "${YEL} Install: sudo apt install netcat-openbsd${RST}" >&2 |
| 85 | + exit 1 |
| 86 | +fi |
| 87 | + |
| 88 | +if ! command -v prips &>/dev/null; then |
| 89 | + echo -e "${RED}[!] Missing dependency: prips${RST}" >&2 |
| 90 | + echo -e "${YEL} Install: sudo apt install prips${RST}" >&2 |
| 91 | + exit 1 |
| 92 | +fi |
| 93 | + |
| 94 | +# ─── IP arithmetic helpers ─────────────────────────────────────────────────── |
| 95 | +_ip_to_int() { |
| 96 | + local IFS='.' |
| 97 | + read -r a b c d <<< "$1" |
| 98 | + echo $(( (a << 24) + (b << 16) + (c << 8) + d )) |
| 99 | +} |
| 100 | + |
| 101 | +_int_to_ip() { |
| 102 | + local ip="$1" |
| 103 | + printf '%d.%d.%d.%d\n' \ |
| 104 | + $(( (ip >> 24) & 255 )) \ |
| 105 | + $(( (ip >> 16) & 255 )) \ |
| 106 | + $(( (ip >> 8) & 255 )) \ |
| 107 | + $(( ip & 255 )) |
| 108 | +} |
| 109 | + |
| 110 | +# ─── Expand IP targets ─────────────────────────────────────────────────────── |
| 111 | +expand_ips() { |
| 112 | + local input="$1" |
| 113 | + local items=() |
| 114 | + |
| 115 | + # Split on commas |
| 116 | + IFS=',' read -ra items <<< "$input" |
| 117 | + |
| 118 | + for item in "${items[@]}"; do |
| 119 | + item="$(echo "$item" | xargs)" # trim whitespace |
| 120 | + [[ -z "$item" ]] && continue |
| 121 | + |
| 122 | + if [[ -f "$item" ]]; then |
| 123 | + # ── File: read each line and recursively expand |
| 124 | + while IFS= read -r line || [[ -n "$line" ]]; do |
| 125 | + line="$(echo "$line" | xargs)" |
| 126 | + [[ -z "$line" || "$line" == \#* ]] && continue |
| 127 | + expand_ips "$line" |
| 128 | + done < "$item" |
| 129 | + |
| 130 | + elif [[ "$item" == *"/"* ]]; then |
| 131 | + # ── CIDR notation |
| 132 | + prips "$item" |
| 133 | + |
| 134 | + elif [[ "$item" =~ ^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)-([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)$ ]]; then |
| 135 | + # ── Full IP range: 10.0.0.1-10.0.0.20 |
| 136 | + local start_int end_int |
| 137 | + start_int=$(_ip_to_int "${BASH_REMATCH[1]}") |
| 138 | + end_int=$(_ip_to_int "${BASH_REMATCH[2]}") |
| 139 | + for (( ip = start_int; ip <= end_int; ip++ )); do |
| 140 | + _int_to_ip "$ip" |
| 141 | + done |
| 142 | + |
| 143 | + elif [[ "$item" =~ ^([0-9]+\.[0-9]+\.[0-9]+\.)([0-9]+)-([0-9]+)$ ]]; then |
| 144 | + # ── Short range: 192.168.1.1-20 |
| 145 | + local prefix="${BASH_REMATCH[1]}" |
| 146 | + local lo="${BASH_REMATCH[2]}" |
| 147 | + local hi="${BASH_REMATCH[3]}" |
| 148 | + for (( i = lo; i <= hi; i++ )); do |
| 149 | + echo "${prefix}${i}" |
| 150 | + done |
| 151 | + |
| 152 | + else |
| 153 | + # ── Single IP or hostname |
| 154 | + echo "$item" |
| 155 | + fi |
| 156 | + done |
| 157 | +} |
| 158 | + |
| 159 | +# ─── Expand ports ──────────────────────────────────────────────────────────── |
| 160 | +expand_ports() { |
| 161 | + local input="$1" |
| 162 | + local items=() |
| 163 | + IFS=',' read -ra items <<< "$input" |
| 164 | + |
| 165 | + for item in "${items[@]}"; do |
| 166 | + item="$(echo "$item" | xargs)" |
| 167 | + if [[ "$item" =~ ^([0-9]+)-([0-9]+)$ ]]; then |
| 168 | + local lo="${BASH_REMATCH[1]}" |
| 169 | + local hi="${BASH_REMATCH[2]}" |
| 170 | + for (( p = lo; p <= hi; p++ )); do |
| 171 | + echo "$p" |
| 172 | + done |
| 173 | + elif [[ "$item" =~ ^[0-9]+$ ]]; then |
| 174 | + echo "$item" |
| 175 | + else |
| 176 | + echo -e "${RED}[!] Invalid port: $item${RST}" >&2 |
| 177 | + exit 1 |
| 178 | + fi |
| 179 | + done |
| 180 | +} |
| 181 | + |
| 182 | +# ─── Core check function ──────────────────────────────────────────────────── |
| 183 | +check_port() { |
| 184 | + local timeout="$1" |
| 185 | + local host="$2" |
| 186 | + local port="$3" |
| 187 | + local do_resolve="$4" |
| 188 | + |
| 189 | + # With resolve: nc -vzw<T> (lets nc do DNS resolution / shows resolved name) |
| 190 | + # Without resolve: nc -nvzw<T> (-n skips DNS) |
| 191 | + local nc_flags |
| 192 | + if [[ "$do_resolve" == "true" ]]; then |
| 193 | + nc_flags="-vzw${timeout}" |
| 194 | + else |
| 195 | + nc_flags="-nvzw${timeout}" |
| 196 | + fi |
| 197 | + |
| 198 | + local output |
| 199 | + # nc writes connection info to stderr |
| 200 | + if output=$(nc $nc_flags "$host" "$port" 2>&1); then |
| 201 | + echo -e "${GRN}[OPEN]${RST} ${host}:${port}" |
| 202 | + else |
| 203 | + echo -e "${RED}[CLOSED]${RST} ${host}:${port}" >&2 |
| 204 | + fi |
| 205 | +} |
| 206 | + |
| 207 | +# Export for GNU parallel |
| 208 | +export -f check_port 2>/dev/null || true |
| 209 | +export RED GRN YEL CYN RST 2>/dev/null || true |
| 210 | + |
| 211 | +# ─── Build target list ─────────────────────────────────────────────────────── |
| 212 | +mapfile -t IP_LIST < <(expand_ips "$IP_ARG" | sort -u -t'.' -k1,1n -k2,2n -k3,3n -k4,4n) |
| 213 | +mapfile -t PORT_LIST < <(expand_ports "$PORT_ARG" | sort -nu) |
| 214 | + |
| 215 | +TOTAL_IPS=${#IP_LIST[@]} |
| 216 | +TOTAL_PORTS=${#PORT_LIST[@]} |
| 217 | +TOTAL_CHECKS=$(( TOTAL_IPS * TOTAL_PORTS )) |
| 218 | + |
| 219 | +if [[ "$TOTAL_IPS" -eq 0 ]]; then |
| 220 | + echo -e "${RED}[!] No valid targets resolved from '${IP_ARG}'.${RST}" >&2 |
| 221 | + exit 1 |
| 222 | +fi |
| 223 | + |
| 224 | +# echo -e "${YEL}──────────────────────────────────────────────────${RST}" |
| 225 | +# echo -e "${CYN} tnc.sh — TCP Port Checker${RST}" |
| 226 | +# echo -e "${YEL}──────────────────────────────────────────────────${RST}" |
| 227 | +# echo -e " Targets : ${TOTAL_IPS} host(s)" |
| 228 | +# echo -e " Ports : ${TOTAL_PORTS} port(s) [${PORT_ARG}]" |
| 229 | +# echo -e " Checks : ${TOTAL_CHECKS} total" |
| 230 | +# echo -e " Timeout : ${TIMEOUT}s" |
| 231 | +# echo -e " Resolve : ${RESOLVE}" |
| 232 | +# [[ -n "$THREADS" ]] && echo -e " Threads : ${THREADS} (GNU parallel)" |
| 233 | +# echo -e "${YEL}──────────────────────────────────────────────────${RST}" |
| 234 | +# echo "" |
| 235 | + |
| 236 | +# ─── Execute checks ───────────────────────────────────────────────────────── |
| 237 | +if [[ -n "$THREADS" ]]; then |
| 238 | + # ── Parallel mode ───────────────────────────────────────────────────── |
| 239 | + job_list=$(mktemp) |
| 240 | + for host in "${IP_LIST[@]}"; do |
| 241 | + for port in "${PORT_LIST[@]}"; do |
| 242 | + echo "$TIMEOUT $host $port $RESOLVE" |
| 243 | + done |
| 244 | + done > "$job_list" |
| 245 | + |
| 246 | + parallel --will-cite -j "$THREADS" --colsep ' ' \ |
| 247 | + check_port {1} {2} {3} {4} < "$job_list" |
| 248 | + |
| 249 | + rm -f "$job_list" |
| 250 | +else |
| 251 | + # ── Sequential mode ─────────────────────────────────────────────────── |
| 252 | + for host in "${IP_LIST[@]}"; do |
| 253 | + for port in "${PORT_LIST[@]}"; do |
| 254 | + check_port "$TIMEOUT" "$host" "$port" "$RESOLVE" |
| 255 | + done |
| 256 | + done |
| 257 | +fi |
| 258 | + |
| 259 | +# echo "" |
| 260 | +# echo -e "${YEL}──────────────────────────────────────────────────${RST}" |
| 261 | +# echo -e "${GRN} Done. ${TOTAL_CHECKS} check(s) completed.${RST}" |
| 262 | +# echo -e "${YEL}──────────────────────────────────────────────────${RST}" |
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