syncthing/lib/osutil/net.go

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// Copyright (C) 2015 The Syncthing Authors.
//
2015-03-07 20:36:35 +00:00
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package osutil
import (
"net"
)
func GetLans() ([]*net.IPNet, error) {
intfs, err := net.Interfaces()
if err != nil {
return nil, err
}
var addrs []net.Addr
for _, intf := range intfs {
if intf.Flags&net.FlagRunning == 0 {
continue
}
if intf.Flags&net.FlagPointToPoint != 0 {
// Point-to-point interfaces are typically VPNs and similar
// which, for our purposes, do not qualify as LANs.
continue
}
intfAddrs, err := intf.Addrs()
if err != nil {
return nil, err
}
addrs = append(addrs, intfAddrs...)
}
nets := make([]*net.IPNet, 0, len(addrs))
for _, addr := range addrs {
net, ok := addr.(*net.IPNet)
if ok {
nets = append(nets, net)
}
}
return nets, nil
}
func IPFromAddr(addr net.Addr) (net.IP, error) {
switch a := addr.(type) {
case *net.TCPAddr:
return a.IP, nil
case *net.UDPAddr:
return a.IP, nil
default:
host, _, err := net.SplitHostPort(addr.String())
return net.ParseIP(host), err
}
}