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https://github.com/AdguardTeam/AdGuardHome.git
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3cc5bf210d
Merge in DNS/adguard-home from 1708-secondary-dns to master Updates #1708. Squashed commit of the following: commit 4529452e31131763f00c9c834cc95638f1a3d142 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Mon Nov 9 18:12:57 2020 +0300 * dhcpd: send secondary dns as well
43 lines
741 B
Go
43 lines
741 B
Go
package dhcpd
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import (
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"encoding/binary"
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"fmt"
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"net"
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)
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func isTimeout(err error) bool {
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operr, ok := err.(*net.OpError)
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if !ok {
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return false
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}
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return operr.Timeout()
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}
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func parseIPv4(text string) (net.IP, error) {
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result := net.ParseIP(text)
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if result == nil {
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return nil, fmt.Errorf("%s is not an IP address", text)
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}
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if result.To4() == nil {
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return nil, fmt.Errorf("%s is not an IPv4 address", text)
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}
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return result.To4(), nil
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}
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// Return TRUE if subnet mask is correct (e.g. 255.255.255.0)
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func isValidSubnetMask(mask net.IP) bool {
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var n uint32
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n = binary.BigEndian.Uint32(mask)
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for i := 0; i != 32; i++ {
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if n == 0 {
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break
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}
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if (n & 0x80000000) == 0 {
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return false
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}
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n <<= 1
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}
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return true
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}
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