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Path: usr/sbin/

✏️ Editing: ifup

#!/bin/sh
########################################################################
# Begin /sbin/ifup
#
# Description : Interface Up
#
# Authors     : Nathan Coulson - nathan at linuxfromscratch.org
#               Kevin P. Fleming - kpfleming at linuxfromscratch.org
# Update      : Bruce Dubbs - bdubbs at linuxfromscratch.org
#               DJ Lucas - dj at linuxfromscratch.org
#               Joel Bion - jpbipv6hint at gmail.com
#
# Version     : LFS 9.0
#
# Notes       : The IFCONFIG variable is passed to the SERVICE script
#               in the /lib/services directory, to indicate what file the
#               service should source to get interface specifications.
#
########################################################################

up()
{
   log_info_msg "Bringing up the ${1} interface..."

if ip link show $1 > /dev/null 2>&1; then
      link_status=`ip link show $1`

if [ -n "${link_status}" ]; then
         if ! echo "${link_status}" | grep -q UP; then
            ip link set $1 up
         fi
      fi

else
      log_failure_msg "Interface ${IFACE} doesn't exist."
      exit 1
   fi

evaluate_retval
}

RELEASE="9.0"

USAGE="Usage: $0 [ -hV ] [--help] [--version] interface"
VERSTR="LFS ifup, version ${RELEASE}"

while [ $# -gt 0 ]; do
    case "$1" in
       --help | -h)     help="y"; break ;;

--version | -V)  echo "${VERSTR}"; exit 0 ;;

-*)              echo "ifup: ${1}: invalid option" >&2
                        echo "${USAGE}" >& 2
                        exit 2 ;;

*)               break ;;
    esac
done

if [ -n "$help" ]; then
    echo "${VERSTR}"
    echo "${USAGE}"
    echo
    cat << HERE_EOF
ifup is used to bring up a network interface.  The interface
parameter, e.g. eth0 or eth0:2, must match the trailing part of the
interface specifications file, e.g. /etc/sysconfig/ifconfig.eth0:2.

HERE_EOF
    exit 0
fi

file=/etc/sysconfig/ifconfig.${1}

# Skip backup files
[ "${file}" = "${file%""~""}" ] || exit 0

. /lib/lsb/init-functions

if [ ! -r "${file}" ]; then
    log_failure_msg "Unable to bring up ${1} interface! ${file} is missing or cannot be accessed."
    exit 1
fi

.  $file

if [ "$IFACE" = "" ]; then
    log_failure_msg "Unable to bring up ${1} interface! ${file} does not define an interface [IFACE]."
    exit 1
fi

# Do not process this service if started by boot, and ONBOOT
# is not set to yes
if [ "${IN_BOOT}" = "1" -a "${ONBOOT}" != "yes" ]; then
    exit 0
fi

# Bring up the interface
if [ "$VIRTINT" != "yes" ]; then
    up ${IFACE}
fi

for S in ${SERVICE}; do
   if [ ! -x "/lib/services/${S}" ]; then
     MSG="\nUnable to process ${file}.  Either "
     MSG="${MSG}the SERVICE '${S} was not present "
     MSG="${MSG}or cannot be executed."
     log_failure_msg "$MSG"
     exit 1
   fi
done

if [ "${SERVICE}" = "wpa" ]; then log_success_msg; fi

# Create/configure the interface
for S in ${SERVICE}; do
   IFCONFIG=${file} /lib/services/${S} ${IFACE} up
done

# Set link up virtual interfaces
if [ "${VIRTINT}" == "yes" ]; then
    up ${IFACE}
fi

# Bring up any additional interface components
for I in $INTERFACE_COMPONENTS; do up $I; done

# Set MTU if requested. Check if MTU has a "good" value.
# if test -n "${MTU}"; then
#     if [[ ${MTU} =~ ^[0-9]+$ ]] &amp;&amp; [[ $MTU -ge 68 ]] ; then
#        for I in $IFACE $INTERFACE_COMPONENTS; do
#           ip link set dev $I mtu $MTU;
#        done
#     else
#        log_info_msg2 "Invalid MTU $MTU"
#     fi
# fi

# Set the IPv4 default gateway if requested
if [ -n "${GATEWAY}" ]; then
    if ip -4 route | grep -q default; then
       log_warning_msg "IPv4 Gateway already set up; skipping."
    else
       log_info_msg "Adding default IPv4 gateway ${GATEWAY} to the ${IFACE} interface..."
       ip route add default via ${GATEWAY} dev ${IFACE}
       evaluate_retval
    fi
fi

# Set the IPv6 default gateway if requested (but only if an IPv6 address was
# given)
if [ "${IP6}" ]; then
    if [ -n "${GATEWAY6}" ]; then
       if ip -6 route | grep -q default; then
          log_warning_msg "IPv6 gateway already set up; skipping."
       else
          log_info_msg "Adding default IPv6 gateway ${GATEWAY} to the ${IFACE} interface..."
          ip -6 route add default via ${GATEWAY6} dev ${IFACE}
          evaluate_retval
       fi
    fi
fi

# End /sbin/ifup

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