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90 lines
2.3 KiB
90 lines
2.3 KiB
package protocol
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import (
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"errors"
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"github.com/v2ray/v2ray-core/common/alloc"
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"github.com/v2ray/v2ray-core/common/log"
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v2net "github.com/v2ray/v2ray-core/common/net"
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"github.com/v2ray/v2ray-core/transport"
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)
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var (
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ErrorUnknownAddressType = errors.New("Unknown Address Type.")
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)
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type Socks5UDPRequest struct {
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Fragment byte
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Address v2net.Address
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Port v2net.Port
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Data *alloc.Buffer
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}
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func (request *Socks5UDPRequest) Destination() v2net.Destination {
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return v2net.UDPDestination(request.Address, request.Port)
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}
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func (request *Socks5UDPRequest) Write(buffer *alloc.Buffer) {
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buffer.AppendBytes(0, 0, request.Fragment)
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switch {
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case request.Address.IsIPv4():
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buffer.AppendBytes(AddrTypeIPv4).Append(request.Address.IP())
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case request.Address.IsIPv6():
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buffer.AppendBytes(AddrTypeIPv6).Append(request.Address.IP())
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case request.Address.IsDomain():
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buffer.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain()))).Append([]byte(request.Address.Domain()))
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}
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buffer.Append(request.Port.Bytes())
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buffer.Append(request.Data.Value)
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}
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func ReadUDPRequest(packet []byte) (*Socks5UDPRequest, error) {
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if len(packet) < 5 {
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return nil, transport.ErrorCorruptedPacket
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}
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request := new(Socks5UDPRequest)
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// packet[0] and packet[1] are reserved
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request.Fragment = packet[2]
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addrType := packet[3]
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var dataBegin int
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switch addrType {
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case AddrTypeIPv4:
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if len(packet) < 10 {
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return nil, transport.ErrorCorruptedPacket
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}
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ip := packet[4:8]
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request.Port = v2net.PortFromBytes(packet[8:10])
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request.Address = v2net.IPAddress(ip)
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dataBegin = 10
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case AddrTypeIPv6:
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if len(packet) < 22 {
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return nil, transport.ErrorCorruptedPacket
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}
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ip := packet[4:20]
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request.Port = v2net.PortFromBytes(packet[20:22])
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request.Address = v2net.IPAddress(ip)
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dataBegin = 22
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case AddrTypeDomain:
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domainLength := int(packet[4])
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if len(packet) < 5+domainLength+2 {
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return nil, transport.ErrorCorruptedPacket
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}
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domain := string(packet[5 : 5+domainLength])
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request.Port = v2net.PortFromBytes(packet[5+domainLength : 5+domainLength+2])
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request.Address = v2net.ParseAddress(domain)
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dataBegin = 5 + domainLength + 2
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default:
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log.Warning("Unknown address type ", addrType)
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return nil, ErrorUnknownAddressType
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}
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if len(packet) > dataBegin {
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request.Data = alloc.NewBuffer().Clear().Append(packet[dataBegin:])
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}
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return request, nil
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}
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