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| author | Martin Lewis | 2019-04-04 13:29:32 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2019-04-04 15:44:36 +0200 |
| commit | 93594b1197cf3ae1835eedebbebb2b40ea2a81f7 (patch) | |
| tree | 91b80f68146a4800fee16e3fa91963ef7b838a1b | |
| parent | 2b6282117f026cfa2a3e7efee7caa054b6265264 (diff) | |
| download | busybox-93594b1197cf3ae1835eedebbebb2b40ea2a81f7.zip busybox-93594b1197cf3ae1835eedebbebb2b40ea2a81f7.tar.gz | |
telnetd: Added support for AYT IAC command.
Fixed a TODO in AYT IAC handling by replying back with a NOP.
Signed-off-by: Martin Lewis <martin.lewis.x84@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
| -rw-r--r-- | networking/telnetd.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/networking/telnetd.c b/networking/telnetd.c index caef151..bd60c86 100644 --- a/networking/telnetd.c +++ b/networking/telnetd.c @@ -249,7 +249,7 @@ safe_write_to_pty_decode_iac(struct tsession *ts) * IAC SE (240) End of subnegotiation. Treated as NOP. * IAC NOP (241) NOP. Supported. * IAC BRK (243) Break. Like serial line break. TODO via tcsendbreak()? - * IAC AYT (246) Are you there. Send back evidence that AYT was seen. TODO (send NOP back)? + * IAC AYT (246) Are you there. * These don't look useful: * IAC DM (242) Data mark. What is this? * IAC IP (244) Suspend, interrupt or abort the process. (Ancient cousin of ^C). @@ -277,6 +277,13 @@ safe_write_to_pty_decode_iac(struct tsession *ts) rc = 2; goto update_and_return; } + if (buf[1] == AYT) { + /* Send back evidence that AYT was seen. */ + buf[1] = NOP; + /*rc =*/ safe_write(ts->sockfd_write, buf, 2); + rc = 2; + goto update_and_return; + } if (buf[1] >= 240 && buf[1] <= 249) { /* NOP (241). Ignore (putty keepalive, etc) */ /* All other 2-byte commands also treated as NOPs here */ |