D.26. /lib/services/ipv4-static

#### Linux From Scratch - Version 12.0

### Appendix D. Boot and sysconfig scripts version-20230728

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# D.26. /lib/services/ipv4-static

    #!/bin/sh
    ########################################################################
    # Begin /lib/services/ipv4-static
    #
    # Description : IPV4 Static Boot Script
    #
    # Authors     : Nathan Coulson - nathan@linuxfromscratch.org
    #               Kevin P. Fleming - kpfleming@linuxfromscratch.org
    # Update      : Bruce Dubbs - bdubbs@linuxfromscratch.org
    #
    # Version     : LFS 7.0
    #
    ########################################################################

    . /lib/lsb/init-functions
    . ${IFCONFIG}

    if [ -z "${IP}" ]; then
       log_failure_msg "\nIP variable missing from ${IFCONFIG}, cannot continue."
       exit 1
    fi

    if [ -z "${PREFIX}" -a -z "${PEER}" ]; then
       log_warning_msg "\nPREFIX variable missing from ${IFCONFIG}, assuming 24."
       PREFIX=24
       args="${args} ${IP}/${PREFIX}"

    elif [ -n "${PREFIX}" -a -n "${PEER}" ]; then
       log_failure_msg "\nPREFIX and PEER both specified in ${IFCONFIG}, cannot continue."
       exit 1

    elif [ -n "${PREFIX}" ]; then
       args="${args} ${IP}/${PREFIX}"

    elif [ -n "${PEER}" ]; then
       args="${args} ${IP} peer ${PEER}"
    fi

    if [ -n "${LABEL}" ]; then
       args="${args} label ${LABEL}"
    fi

    if [ -n "${BROADCAST}" ]; then
       args="${args} broadcast ${BROADCAST}"
    fi

    case "${2}" in
       up)
          if [ "$(ip addr show ${1} 2>/dev/null | grep ${IP}/)" = "" ]; then
             log_info_msg "Adding IPv4 address ${IP} to the ${1} interface..."
             ip addr add ${args} dev ${1}
             evaluate_retval
          else
             log_warning_msg "Cannot add IPv4 address ${IP} to ${1}.  Already present."
          fi
       ;;

       down)
          if [ "$(ip addr show ${1} 2>/dev/null | grep ${IP}/)" != "" ]; then
             log_info_msg "Removing IPv4 address ${IP} from the ${1} interface..."
             ip addr del ${args} dev ${1}
             evaluate_retval
          fi

          if [ -n "${GATEWAY}" ]; then
             # Only remove the gateway if there are no remaining ipv4 addresses
             if [ "$(ip addr show ${1} 2>/dev/null | grep 'inet ')" != "" ]; then
                log_info_msg "Removing default gateway..."
                ip route del default
                evaluate_retval
             fi
          fi
       ;;

       *)
          echo "Usage: ${0} [interface] {up|down}"
          exit 1
       ;;
    esac

    # End /lib/services/ipv4-static

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