mirror of
https://github.com/v2fly/v2ray-core.git
synced 2024-11-09 03:37:37 -05:00
96 lines
2.4 KiB
Go
96 lines
2.4 KiB
Go
package protocol
|
|
|
|
import (
|
|
"errors"
|
|
"net"
|
|
|
|
"github.com/v2ray/v2ray-core/common/alloc"
|
|
"github.com/v2ray/v2ray-core/common/log"
|
|
v2net "github.com/v2ray/v2ray-core/common/net"
|
|
"github.com/v2ray/v2ray-core/transport"
|
|
)
|
|
|
|
var (
|
|
ErrorUnknownAddressType = errors.New("Unknown Address Type.")
|
|
)
|
|
|
|
type Socks5UDPRequest struct {
|
|
Fragment byte
|
|
Address v2net.Address
|
|
Port v2net.Port
|
|
Data *alloc.Buffer
|
|
}
|
|
|
|
func (request *Socks5UDPRequest) Destination() v2net.Destination {
|
|
return v2net.UDPDestination(request.Address, request.Port)
|
|
}
|
|
|
|
func (request *Socks5UDPRequest) Write(buffer *alloc.Buffer) {
|
|
buffer.AppendBytes(0, 0, request.Fragment)
|
|
switch {
|
|
case request.Address.IsIPv4():
|
|
buffer.AppendBytes(AddrTypeIPv4).Append(request.Address.IP())
|
|
case request.Address.IsIPv6():
|
|
buffer.AppendBytes(AddrTypeIPv6).Append(request.Address.IP())
|
|
case request.Address.IsDomain():
|
|
buffer.AppendBytes(AddrTypeDomain, byte(len(request.Address.Domain()))).Append([]byte(request.Address.Domain()))
|
|
}
|
|
buffer.Append(request.Port.Bytes())
|
|
buffer.Append(request.Data.Value)
|
|
}
|
|
|
|
func ReadUDPRequest(packet []byte) (*Socks5UDPRequest, error) {
|
|
if len(packet) < 5 {
|
|
return nil, transport.CorruptedPacket
|
|
}
|
|
request := new(Socks5UDPRequest)
|
|
|
|
// packet[0] and packet[1] are reserved
|
|
request.Fragment = packet[2]
|
|
|
|
addrType := packet[3]
|
|
var dataBegin int
|
|
|
|
switch addrType {
|
|
case AddrTypeIPv4:
|
|
if len(packet) < 10 {
|
|
return nil, transport.CorruptedPacket
|
|
}
|
|
ip := packet[4:8]
|
|
request.Port = v2net.PortFromBytes(packet[8:10])
|
|
request.Address = v2net.IPAddress(ip)
|
|
dataBegin = 10
|
|
case AddrTypeIPv6:
|
|
if len(packet) < 22 {
|
|
return nil, transport.CorruptedPacket
|
|
}
|
|
ip := packet[4:20]
|
|
request.Port = v2net.PortFromBytes(packet[20:22])
|
|
request.Address = v2net.IPAddress(ip)
|
|
dataBegin = 22
|
|
case AddrTypeDomain:
|
|
domainLength := int(packet[4])
|
|
if len(packet) < 5+domainLength+2 {
|
|
return nil, transport.CorruptedPacket
|
|
}
|
|
domain := string(packet[5 : 5+domainLength])
|
|
request.Port = v2net.PortFromBytes(packet[5+domainLength : 5+domainLength+2])
|
|
maybeIP := net.ParseIP(domain)
|
|
if maybeIP != nil {
|
|
request.Address = v2net.IPAddress(maybeIP)
|
|
} else {
|
|
request.Address = v2net.DomainAddress(domain)
|
|
}
|
|
dataBegin = 5 + domainLength + 2
|
|
default:
|
|
log.Warning("Unknown address type %d", addrType)
|
|
return nil, ErrorUnknownAddressType
|
|
}
|
|
|
|
if len(packet) > dataBegin {
|
|
request.Data = alloc.NewBuffer().Clear().Append(packet[dataBegin:])
|
|
}
|
|
|
|
return request, nil
|
|
}
|