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client.go
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client.go
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package gost
import (
"crypto/tls"
"net"
"net/url"
"sync/atomic"
"time"
)
// Client is a proxy client.
// A client is divided into two layers: connector and transporter.
// Connector is responsible for connecting to the destination address through this proxy.
// Transporter performs a handshake with this proxy.
type Client struct {
Connector Connector
Transporter Transporter
}
// Dial connects to the target address.
func (c *Client) Dial(addr string, options ...DialOption) (net.Conn, error) {
return c.Transporter.Dial(addr, options...)
}
// Handshake performs a handshake with the proxy over connection conn.
func (c *Client) Handshake(conn net.Conn, options ...HandshakeOption) (net.Conn, error) {
return c.Transporter.Handshake(conn, options...)
}
// Connect connects to the address addr via the proxy over connection conn.
func (c *Client) Connect(conn net.Conn, addr string) (net.Conn, error) {
return c.Connector.Connect(conn, addr)
}
// DefaultClient is a standard HTTP proxy client.
var DefaultClient = &Client{Connector: HTTPConnector(nil), Transporter: TCPTransporter()}
// Dial connects to the address addr via the DefaultClient.
func Dial(addr string, options ...DialOption) (net.Conn, error) {
return DefaultClient.Dial(addr, options...)
}
// Handshake performs a handshake via the DefaultClient.
func Handshake(conn net.Conn, options ...HandshakeOption) (net.Conn, error) {
return DefaultClient.Handshake(conn, options...)
}
// Connect connects to the address addr via the DefaultClient.
func Connect(conn net.Conn, addr string) (net.Conn, error) {
return DefaultClient.Connect(conn, addr)
}
// Connector is responsible for connecting to the destination address.
type Connector interface {
Connect(conn net.Conn, addr string) (net.Conn, error)
}
// Transporter is responsible for handshaking with the proxy server.
type Transporter interface {
Dial(addr string, options ...DialOption) (net.Conn, error)
Handshake(conn net.Conn, options ...HandshakeOption) (net.Conn, error)
// Indicate that the Transporter supports multiplex
Multiplex() bool
}
type tcpTransporter struct {
count uint64
}
// TCPTransporter creates a transporter for TCP proxy client.
func TCPTransporter() Transporter {
return &tcpTransporter{}
}
func (tr *tcpTransporter) Dial(addr string, options ...DialOption) (net.Conn, error) {
opts := &DialOptions{}
for _, option := range options {
option(opts)
}
if len(opts.IPs) > 0 {
count := atomic.AddUint64(&tr.count, 1)
_, sport, err := net.SplitHostPort(addr)
if err != nil {
return nil, err
}
n := uint64(len(opts.IPs))
addr = opts.IPs[int(count%n)] + ":" + sport
}
if opts.Chain == nil {
return net.DialTimeout("tcp", addr, opts.Timeout)
}
return opts.Chain.Dial(addr)
}
func (tr *tcpTransporter) Handshake(conn net.Conn, options ...HandshakeOption) (net.Conn, error) {
return conn, nil
}
func (tr *tcpTransporter) Multiplex() bool {
return false
}
// DialOptions describes the options for dialing.
type DialOptions struct {
Timeout time.Duration
Chain *Chain
IPs []string
}
// DialOption allows a common way to set dial options.
type DialOption func(opts *DialOptions)
// TimeoutDialOption specifies the timeout used by Transporter.Dial
func TimeoutDialOption(timeout time.Duration) DialOption {
return func(opts *DialOptions) {
opts.Timeout = timeout
}
}
// ChainDialOption specifies a chain used by Transporter.Dial
func ChainDialOption(chain *Chain) DialOption {
return func(opts *DialOptions) {
opts.Chain = chain
}
}
// IPDialOption specifies an IP list used by Transporter.Dial
func IPDialOption(ips ...string) DialOption {
return func(opts *DialOptions) {
opts.IPs = ips
}
}
// HandshakeOptions describes the options for handshake.
type HandshakeOptions struct {
Addr string
User *url.Userinfo
Timeout time.Duration
Interval time.Duration
Retry int
TLSConfig *tls.Config
WSOptions *WSOptions
KCPConfig *KCPConfig
QUICConfig *QUICConfig
}
// HandshakeOption allows a common way to set handshake options.
type HandshakeOption func(opts *HandshakeOptions)
// AddrHandshakeOption specifies the server address
func AddrHandshakeOption(addr string) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.Addr = addr
}
}
// UserHandshakeOption specifies the user used by Transporter.Handshake
func UserHandshakeOption(user *url.Userinfo) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.User = user
}
}
// TimeoutHandshakeOption specifies the timeout used by Transporter.Handshake
func TimeoutHandshakeOption(timeout time.Duration) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.Timeout = timeout
}
}
// IntervalHandshakeOption specifies the interval time used by Transporter.Handshake
func IntervalHandshakeOption(interval time.Duration) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.Interval = interval
}
}
// RetryHandshakeOption specifies the times of retry used by Transporter.Handshake
func RetryHandshakeOption(retry int) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.Retry = retry
}
}
// TLSConfigHandshakeOption specifies the TLS config used by Transporter.Handshake
func TLSConfigHandshakeOption(config *tls.Config) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.TLSConfig = config
}
}
// WSOptionsHandshakeOption specifies the websocket options used by websocket handshake
func WSOptionsHandshakeOption(options *WSOptions) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.WSOptions = options
}
}
// KCPConfigHandshakeOption specifies the KCP config used by KCP handshake
func KCPConfigHandshakeOption(config *KCPConfig) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.KCPConfig = config
}
}
// QUICConfigHandshakeOption specifies the QUIC config used by QUIC handshake
func QUICConfigHandshakeOption(config *QUICConfig) HandshakeOption {
return func(opts *HandshakeOptions) {
opts.QUICConfig = config
}
}