[英]Find IP address and validate which subnet it is in
我們有3座建築物,我想使用一系列if / else語句確定計算機擁有的IP,然后確定它在哪個子網中。
例如:
我想我已經找到了如何識別計算機IP的方法,現在我只需要一點幫助就可以確定如何將IP地址更改為可以評估的數字。 到目前為止,這是我所擁有的,但是我不知道如何以某種方式轉換IP。
#!/bin/bash
ip=192.168.1.20
building1min=192.168.1.1
building1max=192.168.1.255
building2min=192.168.2.1
building2max=192.168.2.255
building3min=192.168.3.1
building3max=192.168.3.255
if [ $ip -lt $building1max && $ip -gt $building1min ]{
echo "User is in Building 1"
} else if [ $ip -lt $building2max && $ip -gt $building2min ]
echo "User is in Building 2"
} else if [ $ip -lt $building3max && $ip -gt $building3min ]{
echo "User is in Building 3"
} else {
echo "User is not in any building"
}
以下代碼應為您指明正確的方向:
#!/usr/bin/env bash
binary=( {0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1}{0..1} )
convertToBinary() {
local -a oct
local o res ip=$1 mask=$2
IFS=. read -ra oct <<< "$ip"
for o in "${oct[@]}"; do
res+=${binary[o]}
done
printf '%s\n' "${res:0:mask}"
}
isInSubnet() {
local sub=$1 ip=$2
local sub_ip=${sub%/*} sub_mask=${sub#*/}
[[ $(convertToBinary "$sub_ip" "$sub_mask") = "$(convertToBinary "$ip" "$sub_mask")" ]]
}
# USAGE
ip=192.168.2.15
b1=192.168.1.0/24 b2=192.168.2.0/24
if isInSubnet "$b1" "$ip"; then
echo building 1
elif isInSubnet "$b2" "$ip"; then
echo building 2
fi
它首先將IP轉換為二進制,然后僅提取網絡地址,然后檢查是否相等。
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