Question

IP地址是66.102.13.19,从这个地址收到的地址就是这个地址。

http://1113984275

But how? And how I can make this with the help of bash. For example, this service can do it, but I do not understand the algorithm.

Answer 1

ip=66.102.13.19
IFS=. read -r a b c d <<< "$ip"
printf  %s%d
  "http://" "$((a * 256 ** 3 + b * 256 ** 2 + c * 256 + d))"

顺便说一句,您问题中的号码与IP地址不匹配。

要将小数点转换为 IP:

#!/bin/bash
dec2ip () {
    local ip delim dec=$@
    for e in {3..0}
    do
        ((octet = dec / (256 ** e) ))
        ((dec -= octet * 256 ** e))
        ip+=$delim$octet
        delim=.
    done
    printf  %s
  "$ip"
}

dec2ip "$@"

要将 IP 转换为小数点:

#!/bin/bash
ip2dec () {
    local a b c d ip=$@
    IFS=. read -r a b c d <<< "$ip"
    printf  %d
  "$((a * 256 ** 3 + b * 256 ** 2 + c * 256 + d))"
}

ip2dec "$@"

演示 :

$ ./dec2ip 1113984275
66.102.13.19

$ ./ip2dec 66.102.13.19
1113984275

这两部剧本依赖Bash的特征,这些特征在一些包恩派的炮弹中并不存在。

#!/usr/bin/awk -f
# dec2ip
BEGIN {
    dec = ARGV[1]
    for (e = 3; e >= 0; e--) {
        octet = int(dec / (256 ^ e))
        dec -= octet * 256 ^ e
        ip = ip delim octet
        delim = "."
    }
    printf("%s
", ip)
}

和

#!/usr/bin/awk -f
# ip2dec
BEGIN {
    ip = ARGV[1]
    split(ip, octets, ".")
    for (i = 1; i <= 4; i++) {
        dec += octets[i] * 256 ** (4 - i)
    }
    printf("%i
", dec)
}

他们可以和上面的巴什剧本一样被调用。

Answer 2

IP 地址 - & gt; 数字 :

echo 66.102.13.19 | tr .  
  | awk  {s = s*256 + $1} END{print s}

数字 - & gt; IP 地址 :

(export ip=1113984275; for i in {1..4}; do s= . $((ip%256))$s && ((ip>>=8)); done; echo ${s:1})

Answer 3

Binary shifting is always faster than multiplying or dividing.
Using a binary AND is faster than mod.

ip2dec(){ # Convert an IPv4 IP number to its decimal equivalent.
          declare -i a b c d;
          IFS=. read a b c d <<<"$*";
          echo "$(((a<<24)+(b<<16)+(c<<8)+d))";
        }
dec2ip(){ # Convert an IPv4 decimal IP value to an IPv4 IP.
          declare -i a=$((0xff)) b=$1; 
          c="$((b>>24&a)).$((b>>16&a)).$((b>>8&a)).$((b&a))";
          echo "$c";
        }

ip=66.102.13.19
a=$(ip2dec "$ip")
b=$(dec2ip "$a")
echo "$ip DecIP=$a IPv4=$b "

Note: This system will fail with values like 0008.
Bash thinks it is an octal number.

要解决这个问题,每个值都必须用下列方法清洗:

IsDecInt()(     # Is the value given on $1 a decimal integer (with sign)?
                declare n=$1; set --
                if [[ $n =~ ^([+-]?)((0)|0*([0-9]*))$ ]]; then
                    set -- "${BASH_REMATCH[@]:1}"
                else
                    exit 1
                fi
                echo "$1$3$4";
          )

  a=$(IsDecInt "$a")||{ Echo "Value $a is not an integer" >&2; exit 1; }

对于(非常)旧的炮弹:自2.04起击落,或破折或任何(合理的)炮弹:

ip2dec(){ # Convert an IPv4 IP number to its decimal equivalent.
          local a b c d;
          IFS=. read a b c d <<-_EOF_
$1
_EOF_
          echo "$(((a<<24)+(b<<16)+(c<<8)+d))";
        }

dec2ip(){   # Convert an IPv4 decimal IP value to an IPv4 IP.
            local a=$((~(-1<<8))) b=$1; 
            c="$((b>>24&a)).$((b>>16&a)).$((b>>8&a)).$((b&a))";
            echo "$c";
        }

ip=$1
a=$(ip2dec "$ip")
b=$(dec2ip "$a")
echo "$ip DecIP=$a IPv4=$b "

Answer 4

我用Int到 ip 转换的版本 :

=========================================================================================================================================================================================================================================================================================================

Answer 5

这里,我的假设是:

$ host google.com
google.com has address 216.58.216.142
$ ./ip2d.sh 216.58.216.142
3627735182
$ ./d2ip.sh 3627735182
216.58.216.142

IP2d.sh :

#!/bin/bash

IFS=.
set -- $*
echo $(( ($1*256**3) + ($2*256**2) + ($3*256) + ($4) ))

d2ip. sh:

#!/bin/bash

IFS=" " read -r a b c d  <<< $(echo  "obase=256 ; $1" |bc)
echo ${a#0}.${b#0}.${c#0}.${d#0}

Answer 6

我认为有一个更简单的解决方案, 也处理任意数量的octets, 没有提到固定的抵消等。

echo 66.102.13.19 |
    tr .  
  |
    while read octet; do
        printf "%.08d" $(echo "obase=2;$octet" | bc)
    done |
    echo $((2#$(cat)))

产出:1113984275

Answer 7

用于bash 的 IP 转换

dec2ip ()
{
   local v=$1
   local i1=$((v>>24&255))
   local i2=$((v>>16&255))
   local i3=$((v>>8&255))
   local i4=$((v&255))
   printf  %d.%d.%d.%d
  $i1 $i2 $i3 $i4
}

友情链接