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telnetd: do not advertise TELNET_LFLOW, we do not support

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it properly.
This commit is contained in:
Denis Vlasenko
2009-02-02 23:43:57 +00:00
parent 04158e0459
commit d814c98692
2 changed files with 184 additions and 8 deletions
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17
networking/telnetd.c
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@@ -35,8 +35,8 @@
/* Structure that describes a session */
struct tsession {
struct tsession *next;
pid_t shell_pid;
int sockfd_read, sockfd_write, ptyfd;
int shell_pid;
/* two circular buffers */
/*char *buf1, *buf2;*/
@@ -247,7 +247,8 @@ make_new_session(
static const char iacs_to_send[] ALIGN1 = {
IAC, DO, TELOPT_ECHO,
IAC, DO, TELOPT_NAWS,
IAC, DO, TELOPT_LFLOW,
/* This requires telnetd.ctrlSQ.patch (incomplete) */
/* IAC, DO, TELOPT_LFLOW, */
IAC, WILL, TELOPT_ECHO,
IAC, WILL, TELOPT_SGA
};
@@ -284,13 +285,13 @@ make_new_session(
/* Child */
/* Careful - we are after vfork! */
/* make new session and process group */
setsid();
/* Restore default signal handling */
/* Restore default signal handling ASAP */
bb_signals((1 << SIGCHLD) + (1 << SIGPIPE), SIG_DFL);
/* open the child's side of the tty. */
/* Make new session and process group */
setsid();
/* Open the child's side of the tty. */
/* NB: setsid() disconnects from any previous ctty's. Therefore
* we must open child's side of the tty AFTER setsid! */
close(0);
@@ -360,7 +361,7 @@ free_session(struct tsession *ts)
* doesn't send SIGKILL. When we close ptyfd,
* kernel sends SIGHUP to processes having slave side opened. */
kill(ts->shell_pid, SIGKILL);
wait4(ts->shell_pid, NULL, 0, NULL);
waitpid(ts->shell_pid, NULL, 0);
#endif
close(ts->ptyfd);
close(ts->sockfd_read);