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112 lines
2.4 KiB
112 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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