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telnetd: add another handshake example in comments, no code changes

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2016-10-12 20:09:22 +02:00
parent b6d421b635
commit 26d88d6bbd
1 changed files with 5 additions and 0 deletions
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5
networking/telnetd.c
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@ -154,6 +154,11 @@ safe_write_to_pty_decode_iac(struct tsession *ts)
* Example: we get this from our own (bbox) telnet client:
* read(5, "\377\374\1""\377\373\37""\377\372\37\0\262\0@\377\360""\377\375\1""\377\375\3"):
* IAC WONT ECHO, IAC WILL NAWS, IAC SB NAWS <cols> <rows> IAC SE, IAC DO SGA
* Another example (telnet-0.17 from old-netkit):
* read(4, "\377\375\3""\377\373\30""\377\373\37""\377\373 ""\377\373!""\377\373\"""\377\373'"
* "\377\375\5""\377\373#""\377\374\1""\377\372\37\0\257\0I\377\360""\377\375\1"):
* IAC DO SGA, IAC WILL TTYPE, IAC WILL NAWS, IAC WILL TSPEED, IAC WILL LFLOW, IAC WILL LINEMODE, IAC WILL NEW_ENVIRON,
* IAC DO STATUS, IAC WILL XDISPLOC, IAC WONT ECHO, IAC SB NAWS <cols> <rows> IAC SE, IAC DO ECHO
*/
if (wr <= 1) {
/* Only the single IAC byte is in the buffer, eat it