From 95867147f5cdf6650dbfc207c8dada86246f23ae Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Fri, 18 Oct 2019 16:47:37 +0200 Subject: [PATCH] telnet: add disabled code to emit EC and IP > I'm trying to connect to a Korenix 3005 switch through telnet > for management purposes, and all is well except for the backspace character > - seems like my switch doesn't handle it too well and instead of erasing > the last character all it does is print some garbage to the screen. > I've had the same issue before while using putty, but saw a solution that > suggests to enable "Telnet special commands" in the options menu, and it > worked. Signed-off-by: Denys Vlasenko --- networking/telnet.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/networking/telnet.c b/networking/telnet.c index 5c8805265..9fc85050b 100644 --- a/networking/telnet.c +++ b/networking/telnet.c @@ -238,6 +238,18 @@ static void handle_net_output(int len) *dst = '\r'; /* Enter -> CR LF */ *++dst = '\n'; } +#if 0 +/* putty's "special commands" mode does this: */ +/* Korenix 3005 switch needs at least the backspace tweak */ + if (c == 0x08 || c == 0x7f) { /* ctrl+h || backspace */ + *dst = IAC; + *++dst = EC; + } + if (c == 0x03) { /* ctrl+c */ + *dst = IAC; + *++dst = IP; + } +#endif dst++; } if (dst - outbuf != 0) -- 2.25.1