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| package packetaddr
|
| import (
| "bytes"
| gonet "net"
|
| "github.com/v2fly/v2ray-core/v5/common/buf"
| "github.com/v2fly/v2ray-core/v5/common/net"
| "github.com/v2fly/v2ray-core/v5/common/protocol"
| )
|
| var addrParser = protocol.NewAddressParser(
| protocol.AddressFamilyByte(0x01, net.AddressFamilyIPv4),
| protocol.AddressFamilyByte(0x02, net.AddressFamilyIPv6),
| )
|
| // AttachAddressToPacket
| // relinquish ownership of data
| // gain ownership of the returning value
| func AttachAddressToPacket(data *buf.Buffer, address gonet.Addr) (*buf.Buffer, error) {
| packetBuf := buf.New()
| udpaddr := address.(*gonet.UDPAddr)
| port, err := net.PortFromInt(uint32(udpaddr.Port))
| if err != nil {
| return nil, err
| }
| err = addrParser.WriteAddressPort(packetBuf, net.IPAddress(udpaddr.IP), port)
| if err != nil {
| return nil, err
| }
| _, err = packetBuf.Write(data.Bytes())
| if err != nil {
| return nil, err
| }
| data.Release()
| return packetBuf, nil
| }
|
| // ExtractAddressFromPacket
| // relinquish ownership of data
| // gain ownership of the returning value
| func ExtractAddressFromPacket(data *buf.Buffer) (*buf.Buffer, gonet.Addr, error) {
| packetBuf := buf.StackNew()
| address, port, err := addrParser.ReadAddressPort(&packetBuf, bytes.NewReader(data.Bytes()))
| if err != nil {
| return nil, nil, err
| }
| addr := &gonet.UDPAddr{
| IP: address.IP(),
| Port: int(port.Value()),
| Zone: "",
| }
| data.Advance(packetBuf.Len())
| packetBuf.Release()
| return data, addr, nil
| }
|
|
