telnetd: make sure telnetd -K exits if child dies
diff --git a/networking/telnetd.c b/networking/telnetd.c
index 1ca6fde..cccf03d 100644
--- a/networking/telnetd.c
+++ b/networking/telnetd.c
@@ -314,6 +314,14 @@
_exit(1); /*bb_perror_msg_and_die("execv %s", loginpath);*/
}
+/* Must match getopt32 string */
+enum {
+ OPT_WATCHCHILD = (1 << 2), /* -K */
+ OPT_INETD = (1 << 3) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -i */
+ OPT_PORT = (1 << 4) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -p */
+ OPT_FOREGROUND = (1 << 6) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -F */
+};
+
#if ENABLE_FEATURE_TELNETD_STANDALONE
static void
@@ -321,6 +329,9 @@
{
struct tsession *t = sessions;
+ if (option_mask32 & OPT_INETD)
+ exit(0);
+
/* Unlink this telnet session from the session list */
if (t == ts)
sessions = ts->next;
@@ -341,7 +352,7 @@
close(ts->sockfd_read);
/* We do not need to close(ts->sockfd_write), it's the same
* as sockfd_read unless we are in inetd mode. But in inetd mode
- * we do not free_session(), ever */
+ * we do not reach this */
free(ts);
/* Scan all sessions and find new maxfd */
@@ -363,8 +374,8 @@
#else /* !FEATURE_TELNETD_STANDALONE */
-/* Never actually called */
-void free_session(struct tsession *ts);
+/* Used in main() only, thus exits. */
+#define free_session(ts) return 0
#endif
@@ -407,13 +418,6 @@
portnbr = 23,
};
#endif
- enum {
- OPT_WATCHCHILD = (1 << 2), /* -K */
- OPT_INETD = (1 << 3) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -i */
- OPT_PORT = (1 << 4) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -p */
- OPT_FOREGROUND = (1 << 6) * ENABLE_FEATURE_TELNETD_STANDALONE, /* -F */
- };
-
/* Even if !STANDALONE, we accept (and ignore) -i, thus people
* don't need to guess whether it's ok to pass -i to us */
opt = getopt32(argv, "f:l:Ki" USE_FEATURE_TELNETD_STANDALONE("p:b:F"),
@@ -493,11 +497,8 @@
while (ts) {
struct tsession *next = ts->next; /* in case we free ts. */
if (ts->shell_pid == -1) {
-#if !ENABLE_FEATURE_TELNETD_STANDALONE
- return 0;
-#else
+ /* Child died ad we detected that */
free_session(ts);
-#endif
} else {
if (ts->size1 > 0) /* can write to pty */
FD_SET(ts->ptyfd, &wrfdset);
@@ -632,14 +633,8 @@
ts = next;
continue;
kill_session:
-#if !ENABLE_FEATURE_TELNETD_STANDALONE
- return 0;
-#else
- if (IS_INETD)
- return 0;
free_session(ts);
ts = next;
-#endif
}
goto again;