mirror of
https://github.com/AdguardTeam/AdGuardHome.git
synced 2024-11-28 09:58:52 +03:00
56 lines
1 KiB
Go
56 lines
1 KiB
Go
package dhcpd
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/AdguardTeam/golibs/log"
|
|
"github.com/joomcode/errorx"
|
|
)
|
|
|
|
func isTimeout(err error) bool {
|
|
operr, ok := err.(*net.OpError)
|
|
if !ok {
|
|
return false
|
|
}
|
|
return operr.Timeout()
|
|
}
|
|
|
|
func wrapErrPrint(err error, message string, args ...interface{}) error {
|
|
var errx error
|
|
if err == nil {
|
|
errx = fmt.Errorf(message, args...)
|
|
} else {
|
|
errx = errorx.Decorate(err, message, args...)
|
|
}
|
|
log.Println(errx.Error())
|
|
return errx
|
|
}
|
|
|
|
func parseIPv4(text string) (net.IP, error) {
|
|
result := net.ParseIP(text)
|
|
if result == nil {
|
|
return nil, fmt.Errorf("%s is not an IP address", text)
|
|
}
|
|
if result.To4() == nil {
|
|
return nil, fmt.Errorf("%s is not an IPv4 address", text)
|
|
}
|
|
return result.To4(), nil
|
|
}
|
|
|
|
// Return TRUE if subnet mask is correct (e.g. 255.255.255.0)
|
|
func isValidSubnetMask(mask net.IP) bool {
|
|
var n uint32
|
|
n = binary.BigEndian.Uint32(mask)
|
|
for i := 0; i != 32; i++ {
|
|
if n == 0 {
|
|
break
|
|
}
|
|
if (n & 0x80000000) == 0 {
|
|
return false
|
|
}
|
|
n <<= 1
|
|
}
|
|
return true
|
|
}
|