68 lines
1.4 KiB
Go
68 lines
1.4 KiB
Go
package dhcpd
|
|
|
|
import (
|
|
"fmt"
|
|
"net"
|
|
|
|
"github.com/hmage/golibs/log"
|
|
"github.com/joomcode/errorx"
|
|
)
|
|
|
|
func isTimeout(err error) bool {
|
|
operr, ok := err.(*net.OpError)
|
|
if !ok {
|
|
return false
|
|
}
|
|
return operr.Timeout()
|
|
}
|
|
|
|
// return first IPv4 address of an interface, if there is any
|
|
func getIfaceIPv4(iface *net.Interface) *net.IPNet {
|
|
ifaceAddrs, err := iface.Addrs()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
for _, addr := range ifaceAddrs {
|
|
ipnet, ok := addr.(*net.IPNet)
|
|
if !ok {
|
|
// not an IPNet, should not happen
|
|
log.Fatalf("SHOULD NOT HAPPEN: got iface.Addrs() element %s that is not net.IPNet", addr)
|
|
}
|
|
|
|
if ipnet.IP.To4() == nil {
|
|
log.Printf("Got IP that is not IPv4: %v", ipnet.IP)
|
|
continue
|
|
}
|
|
|
|
log.Printf("Got IP that is IPv4: %v", ipnet.IP)
|
|
return &net.IPNet{
|
|
IP: ipnet.IP.To4(),
|
|
Mask: ipnet.Mask,
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
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
|
|
}
|