/
dialer.go
146 lines (125 loc) · 2.81 KB
/
dialer.go
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package h2cProxy
import (
"context"
"crypto/tls"
"errors"
"io"
"net"
"net/http"
"net/http/httputil"
"net/url"
"sync"
"github.com/go-gost/core/dialer"
"github.com/go-gost/core/logger"
md "github.com/go-gost/core/metadata"
"github.com/wznpp1/gost_x/registry"
"golang.org/x/net/http2"
)
func init() {
registry.DialerRegistry().Register("h2cProxy", NewDialer)
}
type h2cProxyDialer struct {
clients map[string]*http.Client
clientMutex sync.Mutex
h2c bool
logger logger.Logger
md metadata
options dialer.Options
}
func NewDialer(opts ...dialer.Option) dialer.Dialer {
options := dialer.Options{}
for _, opt := range opts {
opt(&options)
}
return &h2cProxyDialer{
h2c: true,
clients: make(map[string]*http.Client),
logger: options.Logger,
options: options,
}
}
func (d *h2cProxyDialer) Init(md md.Metadata) (err error) {
if err = d.parseMetadata(md); err != nil {
return
}
return nil
}
// Multiplex implements dialer.Multiplexer interface.
func (d *h2cProxyDialer) Multiplex() bool {
return true
}
func (d *h2cProxyDialer) Dial(ctx context.Context, address string, opts ...dialer.DialOption) (net.Conn, error) {
raddr, err := net.ResolveTCPAddr("tcp", address)
if err != nil {
d.logger.Error(err)
return nil, err
}
d.clientMutex.Lock()
client, ok := d.clients[address]
if !ok {
options := &dialer.DialOptions{}
for _, opt := range opts {
opt(options)
}
client = &http.Client{}
if d.h2c {
client.Transport = &http2.Transport{
AllowHTTP: true,
DialTLS: func(network, addr string, cfg *tls.Config) (net.Conn, error) {
return options.NetDialer.Dial(ctx, network, addr)
},
}
}
d.clients[address] = client
}
d.clientMutex.Unlock()
host := d.md.host
if host == "" {
host = address
}
scheme := "https"
if d.h2c {
scheme = "http"
}
pr, pw := io.Pipe()
req := &http.Request{
Method: http.MethodConnect,
URL: &url.URL{Scheme: scheme, Host: host},
Header: d.md.header,
ProtoMajor: 2,
ProtoMinor: 0,
Body: pr,
Host: host,
// ContentLength: -1,
}
if req.Header == nil {
req.Header = make(http.Header)
}
if d.md.path != "" {
req.Method = http.MethodGet
req.URL.Path = d.md.path
}
if d.logger.IsLevelEnabled(logger.TraceLevel) {
dump, _ := httputil.DumpRequest(req, false)
d.logger.Trace(string(dump))
}
resp, err := client.Do(req)
if err != nil {
return nil, err
}
if d.logger.IsLevelEnabled(logger.TraceLevel) {
dump, _ := httputil.DumpResponse(resp, false)
d.logger.Trace(string(dump))
}
if resp.StatusCode != http.StatusOK {
resp.Body.Close()
return nil, errors.New(resp.Status)
}
conn := &h2cProxyhttp2Conn{
r: resp.Body,
w: pw,
remoteAddr: raddr,
localAddr: &net.TCPAddr{IP: net.IPv4zero, Port: 0},
}
return conn, nil
}