From c06f4c3db13c69ec5ff8f3685aa5055c2645b144 Mon Sep 17 00:00:00 2001
From: Christian Pointner <equinox@helsinki.at>
Date: Mon, 21 Dec 2015 20:10:24 +0100
Subject: reading telnet command is now seperate goroutinge in order to read
 Ctrl-C while command is running


diff --git a/src/helsinki.at/rhimportd/ctrlTelnet.go b/src/helsinki.at/rhimportd/ctrlTelnet.go
index 0c0b2be..ff94d49 100644
--- a/src/helsinki.at/rhimportd/ctrlTelnet.go
+++ b/src/helsinki.at/rhimportd/ctrlTelnet.go
@@ -82,7 +82,7 @@ func (c *TelnetClient) handle_cmd_help(args []string) {
 		switch args[0] {
 		case "quit":
 			c.say("usage: quit")
-			c.say("   terminates the client connection.")
+			c.say("   terminates the client connection. You may also use Ctrl-D to do this.")
 			return
 		case "help":
 			c.say("usage: help [ <cmd> ]")
@@ -150,7 +150,7 @@ func (c *TelnetClient) handle_cmd_help(args []string) {
 	default:
 		c.say("usage: <cmd> [ [ <arg1> ] ... ]")
 		c.say("  available commands:")
-		c.say("    quit                   close connection")
+		c.say("    quit                   close connection (or use Ctrl-D)")
 		c.say("    help [ <cmd> ]         print this, or help for specific command")
 		c.say("    set <param> <value>    sets parameter <param> on current import context")
 		c.say("    show                   shows current import context")
@@ -316,16 +316,18 @@ func (c *TelnetClient) handle_cmd_run(args []string) {
 	}
 }
 
-func (c *TelnetClient) handle_cmd(cmdstr string) bool {
+func (c *TelnetClient) handle_cmd(cmdstr string, done chan<- bool) {
 	cmdslice := strings.Fields(cmdstr)
 	if len(cmdslice) == 0 || cmdslice[0] == "" {
-		return false
+		done <- false
+		return
 	}
 	cmd := cmdslice[0]
 	args := cmdslice[1:]
 
 	if cmd == "quit" {
-		return true
+		done <- true
+		return
 	} else if cmd == "help" {
 		c.handle_cmd_help(args)
 	} else if cmd == "set" {
@@ -337,9 +339,9 @@ func (c *TelnetClient) handle_cmd(cmdstr string) bool {
 	} else if cmd == "run" {
 		c.handle_cmd_run(args)
 	} else {
-		c.say("unknown command")
+		c.say("unknown command '%s'", cmd)
 	}
-	return false
+	done <- false
 }
 
 func (c *TelnetClient) handle_iac(iac []byte) bool {
@@ -400,17 +402,17 @@ func ScanLinesTelnet(data []byte, atEOF bool) (advance int, token []byte, err er
 	}
 	if iiac >= 0 {
 		l := 2
-		if (len(data) - iiac) < 1 {
+		if (len(data) - iiac) < 2 {
 			return 0, nil, nil // data does not yet contain the telnet command code -> need more data
 		}
 		switch data[iiac+1] {
 		case DONT, DO, WONT, WILL:
-			if (len(data) - iiac) < 2 {
+			if (len(data) - iiac) < 3 {
 				return 0, nil, nil // this is a 3-byte command and data does not yet contain the option code -> need more data
 			}
 			l = 3
 		}
-
+		// TODO: this doesn't handle escaped IAC bytes correctly: this means utf-8 might be broken...
 		return iiac + l, data[iiac : iiac+l], nil // found a Telnet Command
 	}
 	if atEOF {
@@ -419,34 +421,52 @@ func ScanLinesTelnet(data []byte, atEOF bool) (advance int, token []byte, err er
 	return 0, nil, nil // we have found none of the escape codes -> need more data
 }
 
-func (c *TelnetClient) handle() {
-	defer func() {
-		if err := c.scanner.Err(); err != nil {
-			rhdl.Printf("telnet-ctrl(%s): read command error: %s", c.conn.RemoteAddr(), err)
-		} else {
-			rhdl.Printf("telnet-ctrl(%s): connection closed", c.conn.RemoteAddr())
-		}
-		c.conn.Close()
-	}()
+func (c *TelnetClient) recv(in chan<- string) {
+	defer close(in)
 
-	c.write_string(prompt)
 	for c.scanner.Scan() {
 		b := c.scanner.Bytes()
-		if len(b) > 0 {
-			switch b[0] {
-			case EOT:
+		if len(b) > 0 && b[0] == EOT {
+			rhdl.Printf("telnet-ctrl(%s): Ctrl-D received, closing", c.conn.RemoteAddr())
+			return
+		}
+		in <- string(b)
+	}
+	if err := c.scanner.Err(); err != nil {
+		rhdl.Printf("telnet-ctrl(%s): recv() error: %s", c.conn.RemoteAddr(), err)
+	} else {
+		rhdl.Printf("telnet-ctrl(%s): Connection closed by foreign host", c.conn.RemoteAddr())
+	}
+}
+
+func (c *TelnetClient) handle() {
+	defer c.conn.Close()
+
+	in := make(chan string)
+	go c.recv(in)
+
+	done := make(chan bool)
+	c.write_string(prompt)
+	for {
+		select {
+		case cmd, ok := <-in:
+			if !ok {
 				return
-			case IAC:
-				if exit := c.handle_iac(c.scanner.Bytes()); exit {
-					return
-				}
-			default:
-				if exit := c.handle_cmd(string(b)); exit {
-					return
+			}
+			if len(cmd) > 0 {
+				switch cmd[0] {
+				case IAC:
+					c.handle_iac([]byte(cmd))
+				default:
+					go c.handle_cmd(cmd, done)
 				}
+			} else {
 				c.write_string(prompt)
 			}
-		} else {
+		case exit := <-done:
+			if exit {
+				return
+			}
 			c.write_string(prompt)
 		}
 	}
-- 
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