telnetd: better AYT handling

function                                             old     new   delta
telnetd_main                                        1792    1837     +45

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/networking/telnetd.c b/networking/telnetd.c
index bd60c8681..e94d3bd3d 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -278,9 +278,14 @@ safe_write_to_pty_decode_iac(struct tsession *ts)
                 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);
+                if (ts->size2 == 0) { /* if nothing buffered yet... */
+                        /* Send back evidence that AYT was seen */
+                        unsigned char *buf2 = TS_BUF2(ts);
+                        buf2[0] = IAC;
+                        buf2[1] = NOP;
+                        ts->wridx2 = 0;
+                        ts->rdidx2 = ts->size2 = 2;
+                }
                 rc = 2;
                 goto update_and_return;
         }