145 lines
2.7 KiB
Go
145 lines
2.7 KiB
Go
package constant
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import (
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"context"
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"fmt"
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"net"
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"time"
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)
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// Adapter Type
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const (
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Direct AdapterType = iota
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Reject
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Shadowsocks
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Snell
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Socks5
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Http
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Vmess
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Trojan
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Relay
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Selector
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Fallback
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URLTest
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LoadBalance
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)
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type ServerAdapter interface {
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net.Conn
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Metadata() *Metadata
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}
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type Connection interface {
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Chains() Chain
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AppendToChains(adapter ProxyAdapter)
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}
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type Chain []string
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func (c Chain) String() string {
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switch len(c) {
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case 0:
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return ""
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case 1:
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return c[0]
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default:
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return fmt.Sprintf("%s[%s]", c[len(c)-1], c[0])
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}
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}
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type Conn interface {
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net.Conn
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Connection
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}
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type PacketConn interface {
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net.PacketConn
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Connection
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WriteWithMetadata(p []byte, metadata *Metadata) (n int, err error)
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}
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type ProxyAdapter interface {
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Name() string
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Type() AdapterType
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StreamConn(c net.Conn, metadata *Metadata) (net.Conn, error)
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DialContext(ctx context.Context, metadata *Metadata) (Conn, error)
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DialUDP(metadata *Metadata) (PacketConn, error)
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SupportUDP() bool
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MarshalJSON() ([]byte, error)
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Addr() string
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// Unwrap extracts the proxy from a proxy-group. It returns nil when nothing to extract.
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Unwrap(metadata *Metadata) Proxy
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}
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type DelayHistory struct {
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Time time.Time `json:"time"`
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Delay uint16 `json:"delay"`
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}
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type Proxy interface {
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ProxyAdapter
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Alive() bool
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DelayHistory() []DelayHistory
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Dial(metadata *Metadata) (Conn, error)
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LastDelay() uint16
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URLTest(ctx context.Context, url string) (uint16, error)
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}
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// AdapterType is enum of adapter type
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type AdapterType int
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func (at AdapterType) String() string {
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switch at {
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case Direct:
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return "Direct"
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case Reject:
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return "Reject"
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case Shadowsocks:
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return "Shadowsocks"
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case Snell:
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return "Snell"
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case Socks5:
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return "Socks5"
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case Http:
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return "Http"
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case Vmess:
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return "Vmess"
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case Trojan:
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return "Trojan"
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case Relay:
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return "Relay"
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case Selector:
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return "Selector"
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case Fallback:
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return "Fallback"
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case URLTest:
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return "URLTest"
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case LoadBalance:
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return "LoadBalance"
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default:
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return "Unknown"
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}
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}
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// UDPPacket contains the data of UDP packet, and offers control/info of UDP packet's source
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type UDPPacket interface {
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// Data get the payload of UDP Packet
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Data() []byte
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// WriteBack writes the payload with source IP/Port equals addr
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// - variable source IP/Port is important to STUN
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// - if addr is not provided, WriteBack will wirte out UDP packet with SourceIP/Prot equals to origional Target,
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// this is important when using Fake-IP.
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WriteBack(b []byte, addr net.Addr) (n int, err error)
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// Drop call after packet is used, could recycle buffer in this function.
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Drop()
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// LocalAddr returns the source IP/Port of packet
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LocalAddr() net.Addr
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}
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