isipv4.sh

isipv4.sh

#!/usr/bin/env bash

isipv4() {
  if [[ $# -eq 0 ]] ; then
    return 1
  fi

  if [[ $# -gt 1 ]] ; then
    local this="${FUNCNAME[0]}"

    for i in "$@"; do
      $this $i || return 1
    done
  fi

  local ip=$1
  local IFS=.
  local -a a=($ip)
  local quad

  [[ $ip =~ ^[0-9]+(\.[0-9]+){3}$ ]] || return 1

  for quad in {0..3}; do
    [[ "${a[$quad]}" -gt 255 ]] && return 1
  done

  return 0
}

if [[ $# -ne 0 ]] ; then
  isipv4 $@
  exit $?
fi

isipv4.test.sh

#!/usr/bin/env bash

this=$(basename $0)
func=${this%".test.sh"}
file="$(dirname $0)/$func.sh"

if [ ! -f "$file" ]; then
  echo "$file: File not found"
  exit 1
fi

\. "$file"

if [[ $(type -t $func) != function ]]; then
  echo "$func: Function not found"
  exit 0
fi

while read -r test; do
  $func $test || exit 1
done << EOF
1.1.1.1
10.0.0.0
EOF

while read -r test; do
  $func $test && exit 1
done << EOF
1.1.1.
10.0.256.0
EOF

exit 0