sing-box/transport/v2raygrpclite/client.go

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package v2raygrpclite
import (
"context"
"fmt"
"io"
"net"
"net/http"
"net/url"
"github.com/sagernet/sing-box/adapter"
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"github.com/sagernet/sing-box/common/tls"
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"github.com/sagernet/sing-box/option"
M "github.com/sagernet/sing/common/metadata"
N "github.com/sagernet/sing/common/network"
)
var _ adapter.V2RayClientTransport = (*Client)(nil)
var defaultClientHeader = http.Header{
"Content-Type": []string{"application/grpc"},
"User-Agent": []string{"grpc-go/1.48.0"},
"TE": []string{"trailers"},
}
type Client struct {
ctx context.Context
dialer N.Dialer
serverAddr M.Socksaddr
transport *http.Transport
options option.V2RayGRPCOptions
url *url.URL
}
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func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayGRPCOptions, tlsConfig tls.Config) adapter.V2RayClientTransport {
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return &Client{
ctx: ctx,
dialer: dialer,
serverAddr: serverAddr,
options: options,
transport: &http.Transport{
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DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
conn, err := dialer.DialContext(ctx, network, M.ParseSocksaddr(addr))
if err != nil {
return nil, err
}
return tls.ClientHandshake(ctx, conn, tlsConfig)
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},
ForceAttemptHTTP2: true,
},
url: &url.URL{
Scheme: "https",
Host: serverAddr.String(),
Path: fmt.Sprintf("/%s/Tun", url.QueryEscape(options.ServiceName)),
},
}
}
func (c *Client) DialContext(ctx context.Context) (net.Conn, error) {
pipeInReader, pipeInWriter := io.Pipe()
request := &http.Request{
Method: http.MethodPost,
Body: pipeInReader,
URL: c.url,
Proto: "HTTP/2",
ProtoMajor: 2,
Header: defaultClientHeader,
}
request = request.WithContext(ctx)
conn := newLateGunConn(pipeInWriter)
go func() {
response, err := c.transport.RoundTrip(request)
if err == nil {
conn.setup(response.Body, nil)
} else {
conn.setup(nil, err)
}
}()
return conn, nil
}