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113 lines
2.4 KiB
113 lines
2.4 KiB
// Copyright 2023 The frp Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package nathole
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import (
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"bytes"
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"fmt"
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"net"
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"strconv"
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"github.com/fatedier/golib/crypto"
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"github.com/pion/stun"
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"github.com/fatedier/frp/pkg/msg"
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)
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func EncodeMessage(m msg.Message, key []byte) ([]byte, error) {
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buffer := bytes.NewBuffer(nil)
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if err := msg.WriteMsg(buffer, m); err != nil {
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return nil, err
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}
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buf, err := crypto.Encode(buffer.Bytes(), key)
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if err != nil {
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return nil, err
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}
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return buf, nil
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}
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func DecodeMessageInto(data, key []byte, m msg.Message) error {
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buf, err := crypto.Decode(data, key)
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if err != nil {
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return err
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}
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if err := msg.ReadMsgInto(bytes.NewReader(buf), m); err != nil {
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return err
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}
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return nil
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}
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type ChangedAddress struct {
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IP net.IP
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Port int
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}
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func (s *ChangedAddress) GetFrom(m *stun.Message) error {
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a := (*stun.MappedAddress)(s)
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return a.GetFromAs(m, stun.AttrChangedAddress)
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}
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func (s *ChangedAddress) String() string {
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return net.JoinHostPort(s.IP.String(), strconv.Itoa(s.Port))
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}
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func ListAllLocalIPs() ([]net.IP, error) {
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addrs, err := net.InterfaceAddrs()
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if err != nil {
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return nil, err
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}
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ips := make([]net.IP, 0, len(addrs))
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for _, addr := range addrs {
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ip, _, err := net.ParseCIDR(addr.String())
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if err != nil {
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continue
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}
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ips = append(ips, ip)
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}
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return ips, nil
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}
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func ListLocalIPsForNatHole(max int) ([]string, error) {
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if max <= 0 {
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return nil, fmt.Errorf("max must be greater than 0")
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}
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ips, err := ListAllLocalIPs()
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if err != nil {
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return nil, err
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}
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filtered := make([]string, 0, max)
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for _, ip := range ips {
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if len(filtered) >= max {
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break
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}
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// ignore ipv6 address
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if ip.To4() == nil {
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continue
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}
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// ignore localhost IP
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if ip.IsLoopback() || ip.IsLinkLocalUnicast() || ip.IsLinkLocalMulticast() {
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continue
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}
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filtered = append(filtered, ip.String())
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}
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return filtered, nil
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}
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