- (dtucker) Bug #536: Test for and work around openpty/controlling tty
problem on Linux (fixes "could not set controlling tty" errors).
Also renames STREAMS_PUSH_ACQUIRES_CTTY to the more generic SSHD_ACQUIRES_CTTY
and moves the Solaris-specific comments to configure.ac.
diff --git a/ChangeLog b/ChangeLog
index 18a975a..5b4ff34 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,6 +1,8 @@
20030510
- (dtucker) Bug #318: Create ssh_prng_cmds.out during "make" rather than
"make install". Patch by roth@feep.net.
+ - (dtucker) Bug #536: Test for and work around openpty/controlling tty
+ problem on Linux (fixes "could not set controlling tty" errors).
20030504
- (dtucker) Bug #497: Move #include of bsd-cygwin_util.h to openbsd-compat.h.
@@ -1374,4 +1376,4 @@
save auth method before monitor_reset_key_state(); bugzilla bug #284;
ok provos@
-$Id: ChangeLog,v 1.2671 2003/05/10 06:48:23 dtucker Exp $
+$Id: ChangeLog,v 1.2672 2003/05/10 07:05:46 dtucker Exp $
diff --git a/acconfig.h b/acconfig.h
index 6164ecc..0a47064 100644
--- a/acconfig.h
+++ b/acconfig.h
@@ -1,4 +1,4 @@
-/* $Id: acconfig.h,v 1.150 2003/05/02 10:48:21 dtucker Exp $ */
+/* $Id: acconfig.h,v 1.151 2003/05/10 07:05:46 dtucker Exp $ */
#ifndef _CONFIG_H
#define _CONFIG_H
@@ -374,8 +374,8 @@
/* Some systems put this outside of libc */
#undef HAVE_NANOSLEEP
-/* Pushing STREAMS modules incorrectly acquires a controlling TTY */
-#undef STREAMS_PUSH_ACQUIRES_CTTY
+/* Define if sshd somehow reacquires a controlling TTY after setsid() */
+#undef SSHD_ACQUIRES_CTTY
/* Define if cmsg_type is not passed correctly */
#undef BROKEN_CMSG_TYPE
diff --git a/configure.ac b/configure.ac
index d6726ea..dee8528 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1,4 +1,4 @@
-# $Id: configure.ac,v 1.115 2003/05/02 10:48:21 dtucker Exp $
+# $Id: configure.ac,v 1.116 2003/05/10 07:05:46 dtucker Exp $
AC_INIT
AC_CONFIG_SRCDIR([ssh.c])
@@ -188,15 +188,56 @@
AC_DEFINE(SETPROCTITLE_STRATEGY,PS_USE_CLOBBER_ARGV)
AC_DEFINE(SETPROCTITLE_PS_PADDING, '\0')
inet6_default_4in6=yes
- AC_MSG_CHECKING(for broken cmsg_type)
+ # openpty can be in libutil, needed for controlling tty test
+ AC_SEARCH_LIBS(openpty, util)
+ # make sure that openpty does not reacquire controlling terminal
+ AC_MSG_CHECKING(if openpty correctly handles controlling tty)
+ AC_TRY_RUN(
+ [
+#include <stdio.h>
+#include <sys/fcntl.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+
+int
+main()
+{
+ pid_t pid;
+ int fd, ptyfd, ttyfd, status;
+
+ pid = fork();
+ if (pid < 0) { /* failed */
+ exit(1);
+ } else if (pid > 0) { /* parent */
+ waitpid(pid, &status, 0);
+ if (WIFEXITED(status))
+ exit(WEXITSTATUS(status));
+ else
+ exit(2);
+ } else { /* child */
+ close(0); close(1); close(2);
+ setsid();
+ openpty(&ptyfd, &ttyfd, NULL, NULL, NULL);
+ fd = open("/dev/tty", O_RDWR | O_NOCTTY);
+ if (fd >= 0)
+ exit(3); /* Acquired ctty: broken */
+ else
+ exit(0); /* Did not acquire ctty: OK */
+ }
+}
+ ],
+ [
+ AC_MSG_RESULT(yes)
+ ],
+ [
+ AC_MSG_RESULT(no)
+ AC_DEFINE(SSHD_ACQUIRES_CTTY)
+ ]
+ )
case `uname -r` in
- 2.0.*)
- AC_MSG_RESULT(yes)
+ 1.*|2.0.*)
AC_DEFINE(BROKEN_CMSG_TYPE)
;;
- *)
- AC_MSG_RESULT(no)
- ;;
esac
;;
mips-sony-bsd|mips-sony-newsos4)
@@ -230,7 +271,8 @@
AC_DEFINE(LOGIN_NEEDS_UTMPX)
AC_DEFINE(LOGIN_NEEDS_TERM)
AC_DEFINE(PAM_TTY_KLUDGE)
- AC_DEFINE(STREAMS_PUSH_ACQUIRES_CTTY)
+ # Pushing STREAMS modules will cause sshd to acquire a controlling tty.
+ AC_DEFINE(SSHD_ACQUIRES_CTTY)
# hardwire lastlog location (can't detect it on some versions)
conf_lastlog_location="/var/adm/lastlog"
AC_MSG_CHECKING(for obsolete utmp and wtmp in solaris2.x)
diff --git a/sshd.c b/sshd.c
index 62b4f45..63070ac 100644
--- a/sshd.c
+++ b/sshd.c
@@ -1400,11 +1400,11 @@
* setlogin() affects the entire process group. We don't
* want the child to be able to affect the parent.
*/
-#if !defined(STREAMS_PUSH_ACQUIRES_CTTY)
+#if !defined(SSHD_ACQUIRES_CTTY)
/*
- * If setsid is called on Solaris, sshd will acquire the controlling
- * terminal while pushing STREAMS modules. This will prevent the
- * shell from acquiring it later.
+ * If setsid is called, on some platforms sshd will later acquire a
+ * controlling terminal which will result in "could not set
+ * controlling tty" errors.
*/
if (!debug_flag && !inetd_flag && setsid() < 0)
error("setsid: %.100s", strerror(errno));
