Jose Henrique
c800ec1888
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Check scripts syntax / check-scripts-syntax (push) Successful in 41s
692 lines
19 KiB
Bash
692 lines
19 KiB
Bash
#!/usr/bin/env bash
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set -euo pipefail
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readonly SCRIPT_NAME="dns-override.sh"
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readonly SCRIPT_VERSION="1.0.0"
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readonly NC='\033[0m'
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readonly RED='\033[1;31m'
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readonly GREEN='\033[1;32m'
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readonly YELLOW='\033[1;33m'
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readonly BLUE='\033[1;34m'
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readonly GREY='\033[0;37m'
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readonly EMOJI_INFO='ℹ️'
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readonly EMOJI_OK='✅'
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readonly EMOJI_WARN='⚠️'
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readonly EMOJI_ERROR='❌'
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readonly EMOJI_GEAR='🛠️'
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readonly EMOJI_ROCKET='🚀'
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readonly EMOJI_NET='🌐'
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readonly EMOJI_LOCK='🔒'
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SUDO_BIN=""
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declare -a DNS_SERVERS=()
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declare -a DETECTED_MANAGERS=()
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declare -a ACTIONS_ATTEMPTED=()
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declare -a ACTIONS_SUCCEEDED=()
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declare -a ACTIONS_FAILED=()
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declare -a ACTIONS_SKIPPED=()
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log_info() { printf "%b%s %s%b\n" "$GREY" "$EMOJI_INFO" "$1" "$NC"; }
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log_success() { printf "%b%s %s%b\n" "$GREEN" "$EMOJI_OK" "$1" "$NC"; }
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log_warning() { printf "%b%s %s%b\n" "$YELLOW" "$EMOJI_WARN" "$1" "$NC"; }
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log_error() { printf "%b%s %s%b\n" "$RED" "$EMOJI_ERROR" "$1" "$NC" >&2; }
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log_step() { printf "%b%s %s%b\n" "$BLUE" "$EMOJI_GEAR" "$1" "$NC"; }
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die() {
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log_error "$1"
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exit 1
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}
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command_exists() {
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command -v "$1" >/dev/null 2>&1
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}
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trim() {
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local value="$1"
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value="${value#"${value%%[![:space:]]*}"}"
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value="${value%"${value##*[![:space:]]}"}"
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printf '%s' "$value"
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}
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contains_value() {
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local needle="$1"
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shift
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local item
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for item in "$@"; do
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[[ "$item" == "$needle" ]] && return 0
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done
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return 1
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}
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is_valid_ipv4() {
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local ip="$1"
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[[ "$ip" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}$ ]] || return 1
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local o1 o2 o3 o4
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IFS='.' read -r o1 o2 o3 o4 <<<"$ip"
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local octet
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for octet in "$o1" "$o2" "$o3" "$o4"; do
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[[ "$octet" =~ ^[0-9]+$ ]] || return 1
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((octet >= 0 && octet <= 255)) || return 1
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done
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return 0
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}
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is_valid_ipv6() {
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local ip="$1"
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local ipv6_re='^(([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:)|([0-9A-Fa-f]{1,4}:){1,7}:|([0-9A-Fa-f]{1,4}:){1,6}:[0-9A-Fa-f]{1,4}|([0-9A-Fa-f]{1,4}:){1,5}(:[0-9A-Fa-f]{1,4}){1,2}|([0-9A-Fa-f]{1,4}:){1,4}(:[0-9A-Fa-f]{1,4}){1,3}|([0-9A-Fa-f]{1,4}:){1,3}(:[0-9A-Fa-f]{1,4}){1,4}|([0-9A-Fa-f]{1,4}:){1,2}(:[0-9A-Fa-f]{1,4}){1,5}|[0-9A-Fa-f]{1,4}(:[0-9A-Fa-f]{1,4}){1,6}|:((:[0-9A-Fa-f]{1,4}){1,7}|:))(%.+)?$'
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[[ "$ip" =~ $ipv6_re ]]
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}
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is_valid_ip() {
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local ip="$1"
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is_valid_ipv4 "$ip" || is_valid_ipv6 "$ip"
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}
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require_tty() {
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[[ -r /dev/tty && -w /dev/tty ]] || die "No interactive TTY found. This script needs a terminal for prompts (even when using curl | bash)."
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}
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read_tty_input() {
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local prompt="$1"
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local value
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printf "%b" "$prompt" >/dev/tty
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IFS= read -r value </dev/tty || return 1
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printf '%s' "$(trim "$value")"
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}
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run_root() {
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if [[ -n "$SUDO_BIN" ]]; then
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"$SUDO_BIN" "$@"
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else
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"$@"
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fi
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}
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write_root_file() {
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local target="$1"
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local content="$2"
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if [[ -n "$SUDO_BIN" ]]; then
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printf '%s' "$content" | "$SUDO_BIN" tee "$target" >/dev/null
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else
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printf '%s' "$content" >"$target"
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fi
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}
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append_root_file() {
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local target="$1"
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local content="$2"
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if [[ -n "$SUDO_BIN" ]]; then
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printf '%s' "$content" | "$SUDO_BIN" tee -a "$target" >/dev/null
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else
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printf '%s' "$content" >>"$target"
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fi
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}
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ensure_root_context() {
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if [[ "$EUID" -eq 0 ]]; then
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return 0
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fi
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command_exists sudo || die "This script must run as root or with sudo available."
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local source_path="${BASH_SOURCE[0]:-}"
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if [[ -n "$source_path" && -f "$source_path" ]]; then
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log_info "Re-launching with sudo for full root context..."
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exec sudo -E bash "$source_path" "$@"
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fi
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log_warning "Running from stdin (likely curl | bash). Falling back to sudo for privileged operations."
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sudo -v || die "Could not acquire sudo privileges."
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SUDO_BIN="sudo"
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}
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add_manager() {
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local manager="$1"
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if ! contains_value "$manager" "${DETECTED_MANAGERS[@]}"; then
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DETECTED_MANAGERS+=("$manager")
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fi
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}
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detect_managers() {
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DETECTED_MANAGERS=()
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if command_exists systemctl && systemctl is-active --quiet systemd-resolved 2>/dev/null; then
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add_manager "systemd-resolved"
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elif [[ -L /etc/resolv.conf ]] && readlink /etc/resolv.conf 2>/dev/null | grep -Eq 'systemd/resolve'; then
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add_manager "systemd-resolved"
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fi
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if command_exists nmcli || [[ -d /etc/NetworkManager ]]; then
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add_manager "NetworkManager"
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fi
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if command_exists resolvconf || [[ -d /etc/resolvconf ]] || [[ -f /etc/resolvconf.conf ]]; then
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add_manager "resolvconf/openresolv"
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fi
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if command_exists dhclient || [[ -f /etc/dhcp/dhclient.conf ]]; then
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add_manager "dhclient"
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fi
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if command_exists systemctl && systemctl is-active --quiet systemd-networkd 2>/dev/null; then
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add_manager "systemd-networkd"
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elif [[ -d /etc/systemd/network ]]; then
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add_manager "systemd-networkd"
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fi
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if [[ -f /etc/network/interfaces ]] || [[ -d /etc/network/interfaces.d ]]; then
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add_manager "ifupdown"
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fi
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}
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prompt_dns_servers() {
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DNS_SERVERS=()
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local input
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local prompt
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local index
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for index in 1 2; do
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while true; do
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prompt="${BLUE}${EMOJI_NET} Enter DNS server ${index} (required): ${NC}"
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input="$(read_tty_input "$prompt")" || die "Failed to read DNS input from TTY."
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[[ -n "$input" ]] || {
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log_warning "DNS server ${index} is required."
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continue
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}
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if ! is_valid_ip "$input"; then
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log_warning "Invalid IP literal: '$input'. Please enter a valid IPv4 or IPv6 address."
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continue
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fi
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if contains_value "$input" "${DNS_SERVERS[@]}"; then
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log_warning "Duplicate DNS server '$input' is not allowed."
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continue
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fi
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DNS_SERVERS+=("$input")
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break
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done
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done
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while true; do
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prompt="${BLUE}${EMOJI_NET} Enter DNS server 3 (optional, press Enter to skip): ${NC}"
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input="$(read_tty_input "$prompt")" || die "Failed to read DNS input from TTY."
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if [[ -z "$input" ]]; then
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break
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fi
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if ! is_valid_ip "$input"; then
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log_warning "Invalid IP literal: '$input'. Please enter a valid IPv4 or IPv6 address."
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continue
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fi
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if contains_value "$input" "${DNS_SERVERS[@]}"; then
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log_warning "Duplicate DNS server '$input' is not allowed."
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continue
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fi
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DNS_SERVERS+=("$input")
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break
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done
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log_success "DNS server list accepted: ${DNS_SERVERS[*]}"
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}
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check_dns_connectivity() {
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local dns="$1"
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if command_exists dig; then
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dig @"$dns" example.com A +time=2 +tries=1 +short >/dev/null 2>&1 && return 0
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dig @"$dns" . NS +time=2 +tries=1 +short >/dev/null 2>&1 && return 0
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return 1
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fi
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if command_exists drill; then
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drill @"$dns" example.com A >/dev/null 2>&1 && return 0
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drill @"$dns" . NS >/dev/null 2>&1 && return 0
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return 1
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fi
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if command_exists nslookup; then
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nslookup -timeout=2 example.com "$dns" >/dev/null 2>&1 && return 0
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nslookup example.com "$dns" >/dev/null 2>&1 && return 0
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return 1
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fi
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if command_exists nc; then
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nc -z -w2 "$dns" 53 >/dev/null 2>&1 && return 0
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return 1
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fi
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if [[ "$dns" != *:* ]] && command_exists timeout; then
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timeout 2 bash -c "exec 3<>/dev/tcp/$dns/53" >/dev/null 2>&1 && return 0
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return 1
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fi
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return 2
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}
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run_connectivity_checks() {
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log_step "Running best-effort connectivity checks for supplied DNS servers..."
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local dns
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local rc
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for dns in "${DNS_SERVERS[@]}"; do
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if check_dns_connectivity "$dns"; then
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log_success "Reachability check passed for $dns"
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continue
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fi
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rc=$?
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if [[ "$rc" -eq 2 ]]; then
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log_warning "No available tool for probing $dns on this host. Proceeding anyway."
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else
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log_warning "Could not reach DNS server $dns during probe. Proceeding as requested."
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fi
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done
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}
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dns_nameserver_lines() {
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local lines=""
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local dns
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for dns in "${DNS_SERVERS[@]}"; do
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lines+="nameserver ${dns}"$'\n'
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done
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printf '%s' "$lines"
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}
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dns_space_list() {
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printf '%s' "${DNS_SERVERS[*]}"
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}
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dns_comma_list() {
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local out=""
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local dns
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for dns in "${DNS_SERVERS[@]}"; do
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if [[ -z "$out" ]]; then
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out="$dns"
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else
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out+=",${dns}"
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fi
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done
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printf '%s' "$out"
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}
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run_action() {
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local action="$1"
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shift
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ACTIONS_ATTEMPTED+=("$action")
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log_step "$action"
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local rc=0
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if "$@"; then
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ACTIONS_SUCCEEDED+=("$action")
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log_success "$action completed"
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return 0
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fi
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rc=$?
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if [[ "$rc" -eq 2 ]]; then
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ACTIONS_SKIPPED+=("$action")
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log_info "$action not applicable on this system"
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return 0
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fi
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ACTIONS_FAILED+=("$action")
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log_warning "$action failed (best-effort mode: continuing)"
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return 0
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}
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ensure_resolv_conf_mutable_if_needed() {
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if command_exists lsattr && command_exists chattr; then
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local attr_line attr_field
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attr_line="$(run_root lsattr /etc/resolv.conf 2>/dev/null || true)"
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attr_field="${attr_line%% *}"
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if [[ "$attr_field" == *i* ]]; then
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log_warning "/etc/resolv.conf is immutable. Temporarily removing immutable flag for update."
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run_root chattr -i /etc/resolv.conf || return 1
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fi
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fi
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return 0
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}
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apply_static_resolv_conf() {
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ensure_resolv_conf_mutable_if_needed || return 1
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local now lines content
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now="$(date -u '+%Y-%m-%dT%H:%M:%SZ')"
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lines="$(dns_nameserver_lines)"
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content="# Managed by ${SCRIPT_NAME} v${SCRIPT_VERSION} at ${now}"$'\n'
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content+="$lines"
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content+="options timeout:2 attempts:2 rotate"$'\n'
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write_root_file "/etc/resolv.conf" "$content" || return 1
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run_root chmod 644 /etc/resolv.conf || true
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return 0
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}
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apply_systemd_resolved() {
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if ! command_exists systemctl && ! command_exists resolvectl && [[ ! -d /etc/systemd ]]; then
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return 2
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fi
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local dns_line content
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dns_line="$(dns_space_list)"
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content="[Resolve]"$'\n'
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content+="DNS=${dns_line}"$'\n'
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content+="FallbackDNS="$'\n'
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content+="Domains=~."$'\n'
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run_root mkdir -p /etc/systemd/resolved.conf.d || return 1
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write_root_file "/etc/systemd/resolved.conf.d/99-dns-override.conf" "$content" || return 1
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if command_exists systemctl; then
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run_root systemctl daemon-reload >/dev/null 2>&1 || true
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run_root systemctl restart systemd-resolved >/dev/null 2>&1 || run_root systemctl try-restart systemd-resolved >/dev/null 2>&1 || true
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fi
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if command_exists resolvectl; then
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if command_exists ip; then
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local link
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while IFS= read -r link; do
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[[ -n "$link" && "$link" != "lo" ]] || continue
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run_root resolvectl dns "$link" "${DNS_SERVERS[@]}" >/dev/null 2>&1 || true
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run_root resolvectl domain "$link" "~." >/dev/null 2>&1 || true
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done < <(ip -o link show | awk -F': ' '{print $2}' | cut -d'@' -f1)
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fi
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run_root resolvectl flush-caches >/dev/null 2>&1 || true
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fi
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return 0
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}
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apply_networkmanager() {
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if ! command_exists nmcli && [[ ! -d /etc/NetworkManager ]]; then
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return 2
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fi
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local dns_csv nm_conf
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dns_csv="$(dns_comma_list)"
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nm_conf="[main]"$'\n'
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nm_conf+="dns=default"$'\n'
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nm_conf+="rc-manager=symlink"$'\n'
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run_root mkdir -p /etc/NetworkManager/conf.d || return 1
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write_root_file "/etc/NetworkManager/conf.d/90-dns-override.conf" "$nm_conf" || return 1
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if command_exists nmcli; then
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local conn
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while IFS= read -r conn; do
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[[ -n "$conn" ]] || continue
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run_root nmcli connection modify "$conn" ipv4.ignore-auto-dns yes >/dev/null 2>&1 || true
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run_root nmcli connection modify "$conn" ipv6.ignore-auto-dns yes >/dev/null 2>&1 || true
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run_root nmcli connection modify "$conn" ipv4.dns "$dns_csv" >/dev/null 2>&1 || true
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run_root nmcli connection modify "$conn" ipv6.dns "$dns_csv" >/dev/null 2>&1 || true
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run_root nmcli connection up "$conn" >/dev/null 2>&1 || true
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done < <(nmcli -g NAME connection show --active 2>/dev/null || true)
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run_root nmcli general reload >/dev/null 2>&1 || true
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fi
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if command_exists systemctl; then
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run_root systemctl reload NetworkManager >/dev/null 2>&1 || run_root systemctl restart NetworkManager >/dev/null 2>&1 || true
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fi
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return 0
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}
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apply_resolvconf_openresolv() {
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if ! command_exists resolvconf && [[ ! -d /etc/resolvconf ]] && [[ ! -f /etc/resolvconf.conf ]]; then
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return 2
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fi
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local lines
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lines="$(dns_nameserver_lines)"
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run_root mkdir -p /etc/resolvconf/resolv.conf.d || true
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write_root_file "/etc/resolvconf/resolv.conf.d/head" "$lines" || true
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write_root_file "/etc/resolvconf/resolv.conf.d/base" "$lines" || true
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if command_exists resolvconf; then
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printf '%s' "$lines" | run_root resolvconf -a dns-override >/dev/null 2>&1 || true
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run_root resolvconf -u >/dev/null 2>&1 || true
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fi
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return 0
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}
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apply_dhclient() {
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if ! command_exists dhclient && [[ ! -f /etc/dhcp/dhclient.conf ]] && [[ ! -d /etc/dhcp ]]; then
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return 2
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fi
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local conf_path="/etc/dhcp/dhclient.conf"
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local dns_csv block
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dns_csv="$(dns_comma_list)"
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block=$'\n'"# dns-override.sh managed begin"$'\n'
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block+="supersede domain-name-servers ${dns_csv};"$'\n'
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block+="prepend domain-name-servers ${dns_csv};"$'\n'
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block+="# dns-override.sh managed end"$'\n'
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run_root mkdir -p /etc/dhcp || true
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run_root touch "$conf_path" || return 1
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run_root sed -i '/# dns-override.sh managed begin/,/# dns-override.sh managed end/d' "$conf_path" || true
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append_root_file "$conf_path" "$block" || return 1
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return 0
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}
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apply_systemd_networkd() {
|
||
if ! command_exists systemctl && [[ ! -d /etc/systemd/network ]]; then
|
||
return 2
|
||
fi
|
||
|
||
local dns_lines dropin_content
|
||
dns_lines=""
|
||
local dns
|
||
for dns in "${DNS_SERVERS[@]}"; do
|
||
dns_lines+="DNS=${dns}"$'\n'
|
||
done
|
||
|
||
run_root mkdir -p /etc/systemd/network || return 1
|
||
|
||
local has_network_file=0
|
||
local net_file
|
||
for net_file in /etc/systemd/network/*.network; do
|
||
[[ -e "$net_file" ]] || continue
|
||
has_network_file=1
|
||
run_root mkdir -p "${net_file}.d" || true
|
||
dropin_content="[Network]"$'\n'"${dns_lines}Domains=~."$'\n'
|
||
write_root_file "${net_file}.d/99-dns-override.conf" "$dropin_content" || true
|
||
done
|
||
|
||
if [[ "$has_network_file" -eq 0 ]]; then
|
||
dropin_content="[Match]"$'\n'"Name=*"$'\n\n'"[Network]"$'\n'"${dns_lines}Domains=~."$'\n'
|
||
write_root_file "/etc/systemd/network/99-dns-override.network" "$dropin_content" || true
|
||
fi
|
||
|
||
if command_exists systemctl; then
|
||
run_root systemctl daemon-reload >/dev/null 2>&1 || true
|
||
run_root systemctl restart systemd-networkd >/dev/null 2>&1 || run_root systemctl try-restart systemd-networkd >/dev/null 2>&1 || true
|
||
fi
|
||
|
||
return 0
|
||
}
|
||
|
||
patch_ifupdown_file() {
|
||
local file_path="$1"
|
||
[[ -f "$file_path" ]] || return 1
|
||
|
||
local dns_line
|
||
dns_line="$(dns_space_list)"
|
||
local temp_file
|
||
temp_file="$(mktemp)"
|
||
|
||
set +e
|
||
awk -v dns="$dns_line" '
|
||
BEGIN { iface_count = 0 }
|
||
/^[[:space:]]*dns-nameservers[[:space:]]+/ { next }
|
||
{
|
||
print
|
||
if ($0 ~ /^[[:space:]]*iface[[:space:]]+/ && $0 !~ /[[:space:]]lo[[:space:]]/) {
|
||
print " dns-nameservers " dns
|
||
iface_count++
|
||
}
|
||
}
|
||
END {
|
||
if (iface_count == 0) {
|
||
exit 2
|
||
}
|
||
}
|
||
' "$file_path" >"$temp_file"
|
||
local rc=$?
|
||
set -e
|
||
if [[ "$rc" -eq 2 ]]; then
|
||
rm -f "$temp_file"
|
||
return 2
|
||
fi
|
||
[[ "$rc" -eq 0 ]] || {
|
||
rm -f "$temp_file"
|
||
return 1
|
||
}
|
||
|
||
if [[ -n "$SUDO_BIN" ]]; then
|
||
"$SUDO_BIN" mv "$temp_file" "$file_path"
|
||
else
|
||
mv "$temp_file" "$file_path"
|
||
fi
|
||
return 0
|
||
}
|
||
|
||
apply_ifupdown() {
|
||
if [[ ! -f /etc/network/interfaces ]] && [[ ! -d /etc/network/interfaces.d ]]; then
|
||
return 2
|
||
fi
|
||
|
||
local touched=0
|
||
local patch_rc=0
|
||
|
||
if [[ -f /etc/network/interfaces ]]; then
|
||
if patch_ifupdown_file /etc/network/interfaces; then
|
||
touched=1
|
||
else
|
||
patch_rc=$?
|
||
[[ "$patch_rc" -eq 2 ]] || return 1
|
||
fi
|
||
fi
|
||
|
||
if [[ -d /etc/network/interfaces.d ]]; then
|
||
local iface_file rc
|
||
for iface_file in /etc/network/interfaces.d/*; do
|
||
[[ -f "$iface_file" ]] || continue
|
||
if patch_ifupdown_file "$iface_file"; then
|
||
touched=1
|
||
else
|
||
rc=$?
|
||
[[ "$rc" -eq 2 ]] || return 1
|
||
fi
|
||
done
|
||
fi
|
||
|
||
if [[ "$touched" -eq 0 ]]; then
|
||
log_warning "ifupdown detected, but no writable iface stanzas were found to patch automatically."
|
||
log_info "Actionable hint: add 'dns-nameservers $(dns_space_list)' inside each target iface block."
|
||
fi
|
||
|
||
return 0
|
||
}
|
||
|
||
prompt_immutable_lock() {
|
||
command_exists chattr || {
|
||
log_info "chattr not available; skipping immutable lock prompt."
|
||
return 0
|
||
}
|
||
|
||
local answer
|
||
answer="$(read_tty_input "${YELLOW}${EMOJI_LOCK} Make /etc/resolv.conf immutable with chattr +i? [y/N]: ${NC}")" || return 1
|
||
case "$answer" in
|
||
y|Y|yes|YES)
|
||
if run_root chattr +i /etc/resolv.conf; then
|
||
log_success "Immutable lock applied to /etc/resolv.conf."
|
||
log_warning "To edit DNS later, run: sudo chattr -i /etc/resolv.conf"
|
||
else
|
||
log_warning "Failed to apply immutable lock."
|
||
fi
|
||
;;
|
||
*)
|
||
log_info "Immutable lock skipped."
|
||
;;
|
||
esac
|
||
}
|
||
|
||
print_summary() {
|
||
echo
|
||
log_step "Execution summary"
|
||
log_info "Detected managers: ${DETECTED_MANAGERS[*]:-(none detected)}"
|
||
log_info "Actions attempted: ${#ACTIONS_ATTEMPTED[@]}"
|
||
log_success "Actions succeeded: ${#ACTIONS_SUCCEEDED[@]}"
|
||
log_warning "Actions failed: ${#ACTIONS_FAILED[@]}"
|
||
log_info "Actions skipped: ${#ACTIONS_SKIPPED[@]}"
|
||
|
||
if [[ "${#ACTIONS_FAILED[@]}" -gt 0 ]]; then
|
||
local failed
|
||
for failed in "${ACTIONS_FAILED[@]}"; do
|
||
log_warning "Failed action: $failed"
|
||
done
|
||
fi
|
||
|
||
echo
|
||
log_step "Final /etc/resolv.conf"
|
||
run_root cat /etc/resolv.conf 2>/dev/null || cat /etc/resolv.conf 2>/dev/null || log_warning "Could not read /etc/resolv.conf"
|
||
|
||
if command_exists resolvectl; then
|
||
echo
|
||
log_step "resolvectl status snapshot"
|
||
run_root resolvectl status 2>/dev/null || resolvectl status 2>/dev/null || log_warning "Could not get resolvectl status."
|
||
fi
|
||
|
||
if command_exists nmcli; then
|
||
echo
|
||
log_step "NetworkManager DNS snapshot"
|
||
run_root nmcli -f GENERAL.DEVICE,IP4.DNS,IP6.DNS device show 2>/dev/null || nmcli -f GENERAL.DEVICE,IP4.DNS,IP6.DNS device show 2>/dev/null || log_warning "Could not get nmcli DNS snapshot."
|
||
fi
|
||
}
|
||
|
||
main() {
|
||
echo
|
||
printf "%b%s %s v%s%b\n" "$BLUE" "$EMOJI_ROCKET" "$SCRIPT_NAME" "$SCRIPT_VERSION" "$NC"
|
||
log_info "Aggressive best-effort DNS override for Linux hosts."
|
||
log_warning "This script edits multiple DNS manager configs and may restart networking services."
|
||
echo
|
||
|
||
require_tty
|
||
ensure_root_context "$@"
|
||
prompt_dns_servers
|
||
run_connectivity_checks
|
||
detect_managers
|
||
|
||
run_action "Apply systemd-resolved override" apply_systemd_resolved
|
||
run_action "Apply NetworkManager override" apply_networkmanager
|
||
run_action "Apply resolvconf/openresolv override" apply_resolvconf_openresolv
|
||
run_action "Apply dhclient override" apply_dhclient
|
||
run_action "Apply systemd-networkd override" apply_systemd_networkd
|
||
run_action "Apply ifupdown override" apply_ifupdown
|
||
run_action "Write /etc/resolv.conf directly" apply_static_resolv_conf
|
||
|
||
prompt_immutable_lock || log_warning "Immutable lock prompt failed; continuing."
|
||
print_summary
|
||
|
||
echo
|
||
log_success "DNS override flow completed."
|
||
}
|
||
|
||
main "$@"
|