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85 lines
1.8 KiB
Go
85 lines
1.8 KiB
Go
package httpreverse
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import (
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"strconv"
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"strings"
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)
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func IPCIDR(ip string) (string, int, error) {
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if !strings.Contains(ip, "/") {
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return ip, 32, nil
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}
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tmp := strings.Split(ip, "/")
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cidr, err := strconv.Atoi(tmp[1])
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if err != nil {
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return "", 0, err
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}
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intIp, err := IP2Int(tmp[0])
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if err != nil {
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return "", 0, err
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}
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ip, err = Int2IP(int((uint32(intIp) >> (32 - cidr)) << (32 - cidr)))
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return ip, cidr, err
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}
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func IPEnd(ip string, cidr int) (string, error) {
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intIp, err := IP2Int(ip)
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if err != nil {
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return "", err
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}
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ip, err = Int2IP(int(uint32(intIp) | ((uint32(4294967295) << cidr) >> cidr)))
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return ip, err
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}
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func IPStart(ip string, cidr int) (string, error) {
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intIp, err := IP2Int(ip)
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if err != nil {
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return "", err
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}
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ip, err = Int2IP(int((uint32(intIp) >> (32 - cidr)) << (32 - cidr)))
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return ip, err
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}
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func IPInRange(cidrip, ip string) (bool, error) {
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w, c, err := IPCIDR(cidrip)
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if err != nil {
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return false, err
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}
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f, _, err := IPCIDR(ip + "/" + strconv.Itoa(c))
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if err != nil {
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return false, err
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}
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return w == f, nil
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}
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func IPinRange2(startIP string, cidr int, ip string) (bool, error) {
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f, _, err := IPCIDR(ip + "/" + strconv.Itoa(cidr))
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if err != nil {
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return false, err
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}
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return startIP == f, nil
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}
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func IP2Int(ipAddr string) (int, error) {
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var ipNum uint32 = 0
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ipFilter := strings.Split(ipAddr, ".")
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for i := 0; i < len(ipFilter); i++ {
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num, err := strconv.ParseUint(ipFilter[len(ipFilter)-1-i], 10, 32)
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ipNum |= (uint32(num) << (8 * uint32(i)))
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if err != nil {
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return 0, err
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}
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}
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return int(ipNum), nil
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}
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func Int2IP(intIP int) (string, error) {
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var result string
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var ip uint32
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ip = uint32(intIP)
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for i := 0; i < 4; i++ {
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result += strconv.FormatUint(uint64(uint8(ip>>uint8((3-i)*8))), 10) + "."
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}
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return result[0 : len(result)-1], nil
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}
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