mirror of
https://gogs.blitter.com/RLabs/xs
synced 2024-08-14 10:26:42 +00:00
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
package main
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"sync"
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hkex "blitter.com/herradurakex"
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)
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// Demo of a simple client that dials up to a simple test server to
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// send data.
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//
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// While conforming to the basic net.Conn interface HKex.Conn has extra
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// capabilities designed to allow apps to define connection options,
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// encryption/hmac settings and operations across the encrypted channel.
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//
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// Initial setup is the same as using plain net.Dial(), but one may
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// specify extra extension tags (strings) to set the cipher and hmac
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// setting desired; as well as the intended operation mode for the
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// connection (app-specific, passed through to the server to use or
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// ignore at its discretion).
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func main() {
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var wg sync.WaitGroup
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var cAlg string
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var hAlg string
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var server string
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flag.StringVar(&cAlg, "c", "C_AES_256", "cipher [\"C_AES_256\" | \"C_TWOFISH_128\" | \"C_BLOWFISH_64\"]")
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flag.StringVar(&hAlg, "h", "H_SHA256", "hmac [\"H_SHA256\"]")
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flag.StringVar(&server, "s", "localhost:2000", "server hostname/address[:port]")
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flag.Parse()
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conn, err := hkex.Dial("tcp", server, cAlg, hAlg)
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if err != nil {
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fmt.Println("Err!")
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panic(err)
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}
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defer conn.Close()
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wg.Add(1)
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go func() {
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// This will guarantee the side that closes first
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// marks its direction's goroutine as finished.
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// Whichever direction's goroutine finishes first
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// will call wg.Done() once more explicitly to
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// hang up on the other side so the client
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// exits immediately on an EOF from either side.
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defer wg.Done()
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// io.Copy() expects EOF so this will
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// exit with inerr == nil
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_, inerr := io.Copy(os.Stdout, conn)
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if inerr != nil {
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if inerr.Error() != "EOF" {
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fmt.Println(inerr)
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os.Exit(1)
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}
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}
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fmt.Println("[Got Write EOF]")
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wg.Done() // client hanging up, close server read goroutine
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}()
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wg.Add(1)
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go func() {
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defer wg.Done()
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// io.Copy() expects EOF so this will
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// exit with outerr == nil
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_, outerr := io.Copy(conn, os.Stdin)
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if outerr != nil {
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if outerr.Error() != "EOF" {
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fmt.Println(outerr)
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os.Exit(2)
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}
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}
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fmt.Println("[Got Read EOF]")
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wg.Done() // server hung up, close client write goroutine
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}()
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// Wait until both stdin and stdout goroutines finish
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wg.Wait()
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}
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