Toggle IP address configuration between DHCP and Manual

gistfile1.txt

function toggle_dhcp() {
    router_address="192.168.1.105"

    # Get the list of all network services
    network_services=$(networksetup -listallnetworkservices | tail -n +2)

    # Function to get the IP address of a network service
    get_ip_address() {
        networksetup -getinfo "$1" | grep "IP address: 192.168" | awk '{print $3}'
    }

    # Find the active network service based on IP address
    active_service=""
    while IFS= read -r service; do
        ip_address=$(get_ip_address "$service")
        if [[ -n "$ip_address" && "$ip_address" != "none" ]]; then
            active_service="$service"
            break
        fi
    done <<< "$network_services"

    if [[ -z "$active_service" ]]; then
        echo "No active network service found."
        exit 1
    fi

    # Check if the active service is using DHCP or Manual
    ip_assignment=$(networksetup -getinfo "$active_service" | grep -i "DHCP")

    if [[ -n "$ip_assignment" ]]; then
        # Switch to Manual IP configuration
        sudo networksetup -setmanual "$active_service" "$(get_ip_address "$active_service")" 255.255.255.0 "$router_address"
        sudo networksetup -setdnsservers "$active_service" "$router_address"
        echo "Switched to Manual IP configuration for $active_service with DNS set to $router_address"
    else
        # Switch to DHCP
        sudo networksetup -setdhcp "$active_service"
        sudo networksetup -setdnsservers "$active_service" "Empty"
        echo "Switched to DHCP for $active_service and DNS servers removed"
    fi
}