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main.go
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main.go
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package main
import (
"bytes"
"context"
"fmt"
"io"
"log/slog"
"net"
"darvaza.org/darvaza/shared/tls/sni"
)
func main() {
lis, err := net.Listen("tcp", ":443")
if err != nil {
panic(err)
}
slog.Info("run", "listener", ":443")
for {
conn, _ := lis.Accept()
go handle(conn)
}
}
func handle(conn net.Conn) {
defer conn.Close()
tmp := make([]byte, 1024)
n, _ := conn.Read(tmp)
s, err := sni.ReadClientHelloInfo(context.Background(), bytes.NewReader(tmp[:n]))
if err != nil {
// 不是https
return
}
ips, err := QueryDns(s.ServerName)
if err != nil {
slog.Error("QueryDns", "err", err)
}
// 转发
ip := ips[0].String()
newConn, err := net.Dial("tcp", ip+":443")
if err != nil {
slog.Error("new conn", "err", err, "remote", conn.RemoteAddr(), "dst", ip, "domain", s.ServerName)
return
}
defer newConn.Close()
signal := make(chan struct{}, 1)
newConn.Write(tmp[:n])
slog.Info(fmt.Sprintf("%s <-> %s:443", conn.RemoteAddr(), ip), "remote", conn.RemoteAddr(), "dst", ip, "domain", s.ServerName)
go f(newConn, conn, signal)
go f(conn, newConn, signal)
<-signal
}
func f(dst io.WriteCloser, src io.ReadCloser, signal chan struct{}) {
io.Copy(dst, src)
signal <- struct{}{}
}