/
interface.go
executable file
·78 lines (66 loc) · 1.9 KB
/
interface.go
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package gnet
import (
"fmt"
"net"
)
type (
Interface net.Interface
)
func WrapIfi(ifi net.Interface) Interface {
return Interface(ifi)
}
func WrapIfiPtr(ifi *net.Interface) *Interface {
return (*Interface)(ifi)
}
func Interfaces() ([]Interface, error) {
ifis, err := net.Interfaces()
if err != nil {
return nil, err
}
var result []Interface
for _, v := range ifis {
result = append(result, Interface(v))
}
return result, nil
}
func (ifi *Interface) Raw() *net.Interface {
return (*net.Interface)(ifi)
}
// GetV4 returns v4 IP address and IP network of current network interface.
func (ifi *Interface) GetV4() (IP, *IPNet, error) {
if addrList, err := ifi.Raw().Addrs(); err != nil {
return nil, nil, err
} else {
for _, addr := range addrList {
// Notice: sb use 'addr.(*net.IPNet)' convert addr to IPNet, this is DANGEROUS!
// Yes 'addr' is a 'IPNet' structure inside golang source, but it is NOT
// a valid IP network, its IP member is a specific IP address (like 192.168.9.123/24)
// but not IP network required IP address (like 192.168.9.0/24). The correct IP address
// in IP network is the head of IP ranges of the network, like 192.168.9.0/24.
ip, ipNet, err := net.ParseCIDR(addr.String())
if err != nil {
return nil, nil, err
}
if WrapIP(ip).IsV4() {
return IP(ip), WrapIPNetPtr(ipNet), nil
}
}
}
// Sanity-check that the interface has a good address.
return nil, nil, fmt.Errorf("no IP4 network found")
}
func (ifi *Interface) IsUp() bool {
return ifi.Raw().Flags&net.FlagUp > 0
}
func (ifi *Interface) IsLoopBack() bool {
return ifi.Raw().Flags&net.FlagLoopback != 0
}
func (ifi *Interface) IsBroadcast() bool {
return ifi.Raw().Flags&net.FlagBroadcast != 0
}
func (ifi *Interface) IsMulticast() bool {
return ifi.Raw().Flags&net.FlagMulticast != 0
}
func (ifi *Interface) IsPointToPoint() bool {
return ifi.Raw().Flags&net.FlagPointToPoint != 0
}