mirror of https://github.com/vx3r/wg-gen-web.git
101 lines
1.9 KiB
Go
101 lines
1.9 KiB
Go
package util
|
|
|
|
import (
|
|
"errors"
|
|
"io/ioutil"
|
|
"net"
|
|
"os"
|
|
"strings"
|
|
)
|
|
|
|
// ReadFile file content
|
|
func ReadFile(path string) (bytes []byte, err error) {
|
|
bytes, err = ioutil.ReadFile(path)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
return bytes, nil
|
|
}
|
|
|
|
// WriteFile content to file
|
|
func WriteFile(path string, bytes []byte) (err error) {
|
|
err = ioutil.WriteFile(path, bytes, 0644)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// FileExists check if file exists
|
|
func FileExists(name string) bool {
|
|
info, err := os.Stat(name)
|
|
if os.IsNotExist(err) {
|
|
return false
|
|
}
|
|
return !info.IsDir()
|
|
}
|
|
|
|
// DirectoryExists check if directory exists
|
|
func DirectoryExists(name string) bool {
|
|
info, err := os.Stat(name)
|
|
if os.IsNotExist(err) {
|
|
return false
|
|
}
|
|
return info.IsDir()
|
|
}
|
|
|
|
// GetAvailableIp search for an available in cidr against a list of reserved ips
|
|
func GetAvailableIp(cidr string, reserved []string) (string, error) {
|
|
addresses, err := GetAllAddressesFromCidr(cidr)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
|
|
for _, addresse := range addresses {
|
|
ok := true
|
|
for _, r := range reserved {
|
|
if addresse == r {
|
|
ok = false
|
|
break
|
|
}
|
|
}
|
|
if ok {
|
|
return addresse, nil
|
|
}
|
|
}
|
|
|
|
return "", errors.New("no more available address from cidr")
|
|
}
|
|
|
|
// GetAllAddressesFromCidr get all ip addresses from cidr
|
|
func GetAllAddressesFromCidr(cidr string) ([]string, error) {
|
|
ip, ipnet, err := net.ParseCIDR(cidr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
var ips []string
|
|
for ip := ip.Mask(ipnet.Mask); ipnet.Contains(ip); inc(ip) {
|
|
ips = append(ips, ip.String())
|
|
}
|
|
// remove network address and broadcast address (and server ip .1)
|
|
return ips[2 : len(ips)-1], nil
|
|
}
|
|
|
|
// IsIPv6 check if given ip is IPv6
|
|
func IsIPv6(address string) bool {
|
|
return strings.Count(address, ":") >= 2
|
|
}
|
|
|
|
// http://play.golang.org/p/m8TNTtygK0
|
|
func inc(ip net.IP) {
|
|
for j := len(ip) - 1; j >= 0; j-- {
|
|
ip[j]++
|
|
if ip[j] > 0 {
|
|
break
|
|
}
|
|
}
|
|
}
|