ip.sh

#!/bin/bash

_err() {
  printf "$(date +'%Y-%m-%dT%H:%M:%S%z') [ERROR] $@" >&2
}

_usage() {
  _err "Usage: $(basename $0) {$(sed "s/ () /|/g; s/ ()$//g;" <<< $(declare -f | egrep "^[[:alpha:]][[:graph:]]+[[:space:]]\(\)"))} \$IPADDR/\$PREFIX\n"
}

_ipaddrx() {
  (IFS=.; printf "%02x%02x%02x%02x" $ipaddr)
}

_netmaskx() {
  printf "%08x" $(((2**32)-(2**(32-prefix))))
}

_netaddrx() {
  printf "%08x" $((0x$(_ipaddrx)&0x$(_netmaskx)))
}

netaddr() {
  declare netaddrx=$(_netaddrx)
  printf "%d.%d.%d.%d\n" "0x${netaddrx:0:2}" "0x${netaddrx:2:2}" "0x${netaddrx:4:2}" "0x${netaddrx:6:2}"
}

list() {
  declare i j netaddrx=$(_netaddrx)
  declare -a addrsx
  addrsx=( $(for i in $(seq 1 $((2**(32-prefix)-2))); do printf " %08x" $((0x$netaddrx + i)); done) )
  for j in ${addrsx[*]}; do
    printf "%d.%d.%d.%d\n" "0x${j:0:2}" "0x${j:2:2}" "0x${j:4:2}" "0x${j:6:2}"
  done
}

ping() {
  list \
    | xargs -P256 -n1 ping -c1 -W1 \
    | grep ttl \
    | sort -V \
    | sed 's/[^ ]* byte[^ ]* from //g; s/: icmp_seq=[01]*//g; s/\(=6[34]\)/\1 Linux/g; s/\(=12[78]\)/\1 Windows/g; s/\(=25[45]\)/\1 Unix/g; s/ \([^ ]*\)$/\1/g; /ttl/s/\(=[^126][^ ]*\) /\1 Unknown /g;' \
    | column -t
}

if ! [[ "$1" =~ ^$(sed "s/ () /$|^/g; s/ ()$//g;" <<< $(declare -f | egrep "^[[:graph:]]+[[:space:]]\(\)"))$ ]]; then
  _err "Please set method.\n"
  _usage
  exit 1
fi

if ! [[ "$2" =~ ^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+/[0-9]+$ ]]; then
  _err "Please set address cidr format.\n"
  _usage
  exit 1
fi

declare ipaddr prefix

IFS=/ read ipaddr prefix <<< "$2"

"$1" "$2"