From ea05d18d829be5b6c617d6e71144349b2abb856d Mon Sep 17 00:00:00 2001
From: Sergey Matveev <stargrave@stargrave.org>
Date: Tue, 10 Aug 2021 15:02:08 +0300
Subject: [PATCH] proxy

---
 README            |  2 ++
 cmd/proxy/main.go | 57 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 59 insertions(+)
 create mode 100644 cmd/proxy/main.go

diff --git a/README b/README
index 8be9670..c71493f 100644
--- a/README
+++ b/README
@@ -29,5 +29,7 @@ that OpenSSL-dependant ones, or also much more complicated stunnel.
   disable authentication completely with -name "". -show option prints
   connection state after handshake and outputs certificates information.
 
+* cmd/proxy: proxy between UCSPI server and UCSPI client
+
 go.cypherpunks.ru/ucspi is free software: see the file COPYING for
 copying conditions.
diff --git a/cmd/proxy/main.go b/cmd/proxy/main.go
new file mode 100644
index 0000000..3fd4f77
--- /dev/null
+++ b/cmd/proxy/main.go
@@ -0,0 +1,57 @@
+/*
+ucspi/cmd/tlsc -- UCSPI TLS client
+Copyright (C) 2021 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, version 3 of the License.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"os"
+)
+
+func main() {
+	flag.Usage = func() {
+		fmt.Fprintln(os.Stderr, "Usage: UCSPIserver [address] UCSPIclient [address] ucspi-proxy")
+	}
+	flag.Parse()
+	log.SetFlags(log.Lshortfile)
+
+	r := os.NewFile(6, "R")
+	w := os.NewFile(7, "W")
+	if r == nil {
+		log.Fatalln("no 6 file descriptor")
+	}
+	if w == nil {
+		log.Fatalln("no 7 file descriptor")
+	}
+	copiers := make(chan struct{})
+	var err error
+	go func() {
+		_, err = io.Copy(w, os.Stdin)
+		w.Close()
+		close(copiers)
+	}()
+	go func() {
+		io.Copy(os.Stdout, r)
+	}()
+	<-copiers
+	if err != nil {
+		log.Fatalln(err)
+	}
+}
-- 
2.44.0