Add extra IPs script

add-extra-ips.sh

#!/bin/bash

# Root kontrolü
if [[ $EUID -ne 0 ]]; then
    echo "❌ Lütfen bu scripti root olarak çalıştırın."
    exit 1
fi

# OS tespiti
if [ -f /etc/os-release ]; then
    . /etc/os-release
    OS=$ID
    VERSION=$VERSION_ID
fi

SUPPORTED=false
if [[ "$OS" == "ubuntu" && "$(echo "$VERSION >= 14.04" | bc)" -eq 1 ]]; then
    SUPPORTED=true
elif [[ "$OS" == "debian" ]]; then
    SUPPORTED=true
elif [[ "$OS" == "almalinux" || "$OS" == "rocky" || "$OS" == "centos" ]]; then
    if [[ "$VERSION" =~ ^(7|8|9)(\.[0-9]+)?$ ]]; then
        SUPPORTED=true
    fi
fi

if [[ "$SUPPORTED" != "true" ]]; then
    echo "❌ Unsupported OS: $OS $VERSION"
    exit 1
fi

# IP doğrulama fonksiyonları
is_valid_ipv4() { [[ "$1" =~ ^([0-9]{1,3}\.){3}[0-9]{1,3}/[0-9]{1,2}$ ]]; }
is_valid_ipv6() { [[ "$1" =~ ^([0-9a-fA-F:]+:+)+[0-9a-fA-F]+/[0-9]{1,3}$ ]]; }

# IP girişi
echo "📝 Eklemek istediğiniz IP adreslerini girin (örnek: 192.168.1.10/24 veya 2001:db8::1/64)"
echo "✔️ Girişi bitirmek için Ctrl+D tuşlayın:"
IP_LIST=()
while read -r ip; do
    [[ -z "$ip" ]] && continue
    if is_valid_ipv4 "$ip" || is_valid_ipv6 "$ip"; then
        IP_LIST+=("$ip")
    else
        echo "⚠️ Geçersiz IP atlandı: $ip"
    fi
done

if [[ ${#IP_LIST[@]} -eq 0 ]]; then
    echo "⚠️ Geçerli IP girilmedi. Çıkılıyor."
    exit 1
fi

# Varsayılan arayüz
IFACE=$(ip route | grep default | awk '{print $5}' | head -n1)
if [[ -z "$IFACE" ]]; then
    echo "❌ Ağ arayüzü tespit edilemedi."
    exit 1
fi
echo "🔌 IP'ler $IFACE arayüzüne eklenecek..."

# AlmaLinux/Rocky 9+ özel durum
if [[ ("$OS" == "almalinux" || "$OS" == "rocky") && "$VERSION" =~ ^9 ]]; then
    COUNT=0
    for ip in "${IP_LIST[@]}"; do
        if is_valid_ipv4 "$ip"; then
            nmcli connection modify "$IFACE" +ipv4.addresses "$ip"
            nmcli connection modify "$IFACE" ipv4.method manual
        elif is_valid_ipv6 "$ip"; then
            nmcli connection modify "$IFACE" +ipv6.addresses "$ip"
            nmcli connection modify "$IFACE" ipv6.method manual
        fi
        ((COUNT++))
    done
    nmcli connection up "$IFACE"

# Ubuntu/Debian (netplan kullanan sürümler)
elif [[ "$OS" == "ubuntu" && "$(echo "$VERSION >= 17.10" | bc)" -eq 1 ]] || [[ "$OS" == "debian" && -d "/etc/netplan" ]]; then
    cd /etc/netplan || { echo "❌ /etc/netplan dizini bulunamadı!"; exit 1; }

    # 00-* dosyaları öncelikli ara
    NETPLAN_FILE=$(ls 00-*.yaml 00-*.yml 2>/dev/null | head -1)
    [[ -z "$NETPLAN_FILE" ]] && NETPLAN_FILE=$(ls *.yaml *.yml 2>/dev/null | head -1)

    if [[ -z "$NETPLAN_FILE" ]]; then
        NETPLAN_FILE="99-extra-ips.yaml"
        echo "📄 Yeni netplan dosyası oluşturuluyor: $NETPLAN_FILE"
    else
        echo "📄 Mevcut netplan dosyası düzenleniyor: $NETPLAN_FILE"
    fi

    # Yedek al
    [[ -f "$NETPLAN_FILE" ]] && cp "$NETPLAN_FILE" "$NETPLAN_FILE.bak.$(date +%s)"

    # --- DÜZELTİLEN KISIM ---
    # Mevcut IP'leri oku – yalnızca CIDR içeren satırlar alınır
    EXISTING_IPS=$(grep -A 20 "^ *addresses:" "$NETPLAN_FILE" \
                   | grep "^\s*-" \
                   | grep '/' \
                   | sed 's/^\s*-\s*//')

    # Gateway ve nameserver bilgileri
    GATEWAY=$(grep "gateway4:" "$NETPLAN_FILE" | awk '{print $2}')
    if grep -q "nameservers:" "$NETPLAN_FILE"; then
        NAMESERVERS=$(grep -A 10 "nameservers:" "$NETPLAN_FILE" \
                      | grep "^\s*-" \
                      | sed 's/^\s*-\s*//')
        HAS_NAMESERVERS=true
    else
        HAS_NAMESERVERS=false
    fi
    # --- /DÜZELTİLEN KISIM ---

    # Yeni netplan dosyasını yaz
    cat > "$NETPLAN_FILE" <<EOF
# Generated by IP add script
network:
  ethernets:
    $IFACE:
      addresses:
EOF

    # Eski + yeni IP'leri ekle
    [[ -n "$EXISTING_IPS" ]] && while read -r old; do
        [[ -n "$old" ]] && echo "        - $old" >> "$NETPLAN_FILE"
    done <<< "$EXISTING_IPS"

    for ip in "${IP_LIST[@]}"; do
        echo "        - $ip" >> "$NETPLAN_FILE"
    done

    [[ -n "$GATEWAY" ]] && echo "      gateway4: $GATEWAY" >> "$NETPLAN_FILE"

    if [[ "$HAS_NAMESERVERS" == "true" && -n "$NAMESERVERS" ]]; then
        echo "      nameservers:" >> "$NETPLAN_FILE"
        echo "        addresses:" >> "$NETPLAN_FILE"
        while read -r ns; do
            [[ -n "$ns" ]] && echo "          - $ns" >> "$NETPLAN_FILE"
        done <<< "$NAMESERVERS"
        echo "        search: []" >> "$NETPLAN_FILE"
    fi

    echo "  version: 2" >> "$NETPLAN_FILE"

# Ubuntu/Debian eski yapı
elif [[ "$OS" == "ubuntu" || "$OS" == "debian" ]]; then
    IFACE_FILE="/etc/network/interfaces.d/$IFACE.cfg"
    cp "$IFACE_FILE" "$IFACE_FILE.bak.$(date +%s)" 2>/dev/null
    cat > "$IFACE_FILE" <<EOF
auto $IFACE
iface $IFACE inet manual
EOF
    for ip in "${IP_LIST[@]}"; do
        if is_valid_ipv4 "$ip"; then
            echo "up ip addr add $ip dev $IFACE" >> "$IFACE_FILE"
        elif is_valid_ipv6 "$ip"; then
            echo "up ip -6 addr add $ip dev $IFACE" >> "$IFACE_FILE"
        fi
    done

# RHEL/CentOS/AlmaLinux 7–8 klasik yapı
else
    IFCFG="/etc/sysconfig/network-scripts/ifcfg-$IFACE"
    cp "$IFCFG" "$IFCFG.bak.$(date +%s)" 2>/dev/null
    COUNT=0
    for ip in "${IP_LIST[@]}"; do
        if is_valid_ipv4 "$ip"; then
            echo "IPADDR$COUNT=${ip%/*}" >> "$IFCFG"
            echo "PREFIX$COUNT=${ip#*/}" >> "$IFCFG"
        elif is_valid_ipv6 "$ip"; then
            echo "IPV6ADDR$COUNT=$ip" >> "$IFCFG"
        fi
        ((COUNT++))
    done
fi

# Ağ servisini yeniden başlat
echo "🔄 Ağ servisi yeniden başlatılıyor..."
if [[ "$OS" == "ubuntu" && "$(echo "$VERSION >= 17.10" | bc)" -eq 1 ]] || [[ "$OS" == "debian" && -d "/etc/netplan" ]]; then
    echo "🔧 Netplan uygulanıyor..."
    netplan apply
elif [[ "$OS" == "ubuntu" || "$OS" == "debian" ]]; then
    echo "🔧 Ağ servisi yeniden başlatılıyor (legacy)..."
    systemctl restart networking || { ifdown "$IFACE"; ifup "$IFACE"; }
elif [[ "$OS" =~ ^(centos|rocky|almalinux)$ && "$VERSION" =~ ^(7|8)$ ]]; then
    echo "🔧 network.service yeniden başlatılıyor..."
    systemctl restart network
elif [[ "$OS" == "rocky" || "$OS" == "almalinux" ]]; then
    echo "🔧 NetworkManager yeniden başlatılıyor..."
    systemctl reload NetworkManager || systemctl restart NetworkManager
else
    echo "⚠️ Ağ servisi elle yeniden başlatılmalı."
fi

# Sonuç
echo "✅ Eklenen IP adresleri:"
for ip in "${IP_LIST[@]}"; do
    echo " - $ip"
done

⚠️ Disclaimer:

This script makes changes to your network configuration files and restarts networking services.
Please make sure to back up your configuration before running it — especially on production systems.
By using this script, you acknowledge that you do so at your own risk, and the author cannot be held responsible for any unintended consequences, including loss of connectivity.

---

🖥️ Usage on server:

curl -o add-extra-ips.sh https://gist.githubusercontent.com/boranbar/1a982967faff0944f33d721a889b36f6/raw/add-extra-ips.sh
chmod +x add-extra-ips.sh
./add-extra-ips.sh

💡 Note: The script checks for root privileges at the beginning, so you don't need to use sudo.

---

📦 Supported Operating Systems:

• Ubuntu 14.04 and newer (Netplan and ifupdown supported)
• Debian (with or without Netplan)
• AlmaLinux 8 / 9
• RockyLinux 8 / 9
• CentOS 7

---

🌐 Supports IPv4 and IPv6!

You will be prompted to enter one or more IP addresses. You can mix IPv4 and IPv6.

✅ Example entries:

192.168.100.10/24
2001:db8::10/64

To finish input, press Ctrl + D.

---

⚙️ The script:

• Validates IP format (IPv4 / IPv6)
• Detects your OS and selects proper configuration method
• Applies the changes and restarts the network
• Backs up any modified config files

Feel free to fork and improve it further!