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Fix/support cidr #1

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Fix/support cidr #1

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b7df69d
ipv4アドレスの算出にnetパッケージを利用
ryou-kawabata Aug 4, 2022
d50dd0f
不要になったパッケージのimportをやめた
ryou-kawabata Aug 4, 2022
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61 changes: 26 additions & 35 deletions cmd/subspace/utils.go
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Original file line number Diff line number Diff line change
Expand Up @@ -12,8 +12,7 @@ import (
"path/filepath"
"text/template"
"time"
"strconv"
"strings"
"net"
)

func RandomString(n int) string {
Expand Down Expand Up @@ -72,37 +71,29 @@ set -o xtrace
}

func ipv4address(Number int,IPv4_POOL string) (string,error) {
var err error = nil

var hostcidrS[] string = strings.Split(IPv4_POOL,"/")
cidr, _ := strconv.Atoi(hostcidrS[1])
subnet := ((1<<cidr)-1)
subnetmask := ((1<<32)-1)^subnet

var hostOctetS[] string = strings.Split(hostcidrS[0],".")
var hostOctet[4] int
hostOctet[0], _=strconv.Atoi(hostOctetS[0])
hostOctet[1], _=strconv.Atoi(hostOctetS[1])
hostOctet[2], _=strconv.Atoi(hostOctetS[2])
hostOctet[3], _=strconv.Atoi(hostOctetS[3])
host := (hostOctet[0]<<24)|(hostOctet[1]<<16)|(hostOctet[2]<<8)|(hostOctet[3]<<0)

ip := host|Number
ipOctet := [4]int {(ip>>24)&255, (ip>>16)&255, (ip>>8)&255, (ip>>0)&255}

var ipS string = fmt.Sprintf("%d.%d.%d.%d",ipOctet[0],ipOctet[1],ipOctet[2],ipOctet[3])

if (host&subnet) != 0 {
err = fmt.Errorf("IPv4_POOL=\"%s\"",IPv4_POOL)
}else if (Number&subnetmask) != 0 {
err = fmt.Errorf("Number does not fit in the POOL. Number=%d, POOL=\"/%d\"",Number,cidr)
}else if Number == subnet {
err = fmt.Errorf("Broadcast address. Number=%d, IPv4_POOL=\"%s\", address=\"%s\"",Number,IPv4_POOL,ipS)
}else if Number == 0 {
err = fmt.Errorf("Network address. Number=%d, IPv4_POOL=\"%s\", address=\"%s\"",Number,IPv4_POOL,ipS)
}

return ipS,err
_, ipnet, err := net.ParseCIDR(IPv4_POOL)

if err != nil {
return "",err
}

var int64ip int64 =
int64(ipnet.IP[0])*256*256*256+
int64(ipnet.IP[1])*256*256+
int64(ipnet.IP[2])*256+
int64(ipnet.IP[3])+
int64(Number)

var ip net.IP = net.IPv4(
byte(int64ip/256/256/256),
byte(int64ip/256/256%256),
byte(int64ip/256%256),
byte(int64ip%256),
)

if !ipnet.Contains(ip) {
return "",fmt.Errorf("%d hosts can't fit in network %s.",Number,ipnet)
}

return fmt.Sprint(ip),nil
}