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Merge pull request #2 from gunet/non-interactive
update: support non-interactive setup
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| #!/bin/bash | ||
|
|
||
| # converts IPv4 as "A.B.C.D" to integer | ||
| # ip4_to_int 192.168.0.1 | ||
| # => 3232235521 | ||
| ip4_to_int() { | ||
| IFS=. read -r i j k l <<EOF | ||
| $1 | ||
| EOF | ||
| echo $(( (i << 24) + (j << 16) + (k << 8) + l )) | ||
| } | ||
|
|
||
| # converts interger to IPv4 as "A.B.C.D" | ||
| # | ||
| # int_to_ip4 3232235521 | ||
| # => 192.168.0.1 | ||
| int_to_ip4() { | ||
| echo "$(( ($1 >> 24) % 256 )).$(( ($1 >> 16) % 256 )).$(( ($1 >> 8) % 256 )).$(( $1 % 256 ))" | ||
| } | ||
|
|
||
| # returns the ip part of an CIDR | ||
| # | ||
| # cidr_ip "172.16.0.10/22" | ||
| # => 172.16.0.10 | ||
| cidr_ip() { | ||
| IFS=/ read -r ip _ <<EOF | ||
| $1 | ||
| EOF | ||
| echo $ip | ||
| } | ||
|
|
||
| # returns the prefix part of an CIDR | ||
| # | ||
| # cidr_prefix "172.16.0.10/22" | ||
| # => 22 | ||
| cidr_prefix() { | ||
| IFS=/ read -r _ prefix <<EOF | ||
| $1 | ||
| EOF | ||
| echo $prefix | ||
| } | ||
|
|
||
| # returns net mask in numeric format from prefix size | ||
| # | ||
| # netmask_of_prefix 8 | ||
| # => 4278190080 | ||
| int_netmask_of_prefix() { | ||
| netmask_int=$((4294967295 ^ (1 << (32 - $1)) - 1)) | ||
| echo $netmask_int | ||
| } | ||
|
|
||
| # returns net mask in IPv4 format from prefix size | ||
| # | ||
| # netmask_of_prefix 24 | ||
| # => 255.255.255.0 | ||
| netmask_of_prefix() { | ||
| netmask_int=$(int_netmask_of_prefix $1) | ||
| netmask=$(int_to_ip4 $netmask_int) | ||
| echo $netmask | ||
| } | ||
|
|
||
| # IP=$1 | ||
| # echo "IP/net is ${IP}" | ||
| # echo "IP is $(cidr_ip ${IP})" | ||
| # prefix=$(cidr_prefix ${IP}) | ||
| # echo "Prefix is ${prefix}" | ||
| # echo "Netmask is $(netmask_of_prefix ${prefix})" |
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