From 98e7fbb2acee0238381feea5d583fc439aae08e2 Mon Sep 17 00:00:00 2001
From: nicm <nicm>
Date: Mon, 23 Jan 2017 10:09:43 +0000
Subject: Open /dev/ptm before pledge() and save it to be used for PTMGET later
 (this means inlining forkpty()).

ok deraadt
---
 pty.c | 67 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 pty.c

(limited to 'pty.c')

diff --git a/pty.c b/pty.c
new file mode 100644
index 00000000..05a02ef0
--- /dev/null
+++ b/pty.c
@@ -0,0 +1,67 @@
+/* $OpenBSD$ */
+
+/*
+ * Copyright (c) 2017 Nicholas Marriott <nicholas.marriott@gmail.com>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
+ * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <sys/types.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <sys/tty.h>
+
+#include <fcntl.h>
+#include <string.h>
+#include <termios.h>
+#include <unistd.h>
+#include <util.h>
+
+int	pty_open(int *);
+pid_t	pty_fork(int, int *, char *, size_t, struct winsize *);
+
+int
+pty_open(int *fd)
+{
+	*fd = open(PATH_PTMDEV, O_RDWR|O_CLOEXEC);
+	if (*fd < 0)
+	    return (-1);
+	return (0);
+}
+
+pid_t
+pty_fork(int ptmfd, int *fd, char *name, size_t namelen, struct winsize *ws)
+{
+	struct ptmget	ptm;
+	pid_t		pid;
+
+	if ((ioctl(ptmfd, PTMGET, &ptm) == -1))
+		return (-1);
+
+	strlcpy(name, ptm.sn, namelen);
+	ioctl(ptm.sfd, TIOCSWINSZ, ws);
+
+	switch (pid = fork()) {
+	case -1:
+		close(ptm.cfd);
+		close(ptm.sfd);
+		return (-1);
+	case 0:
+		close(ptm.cfd);
+		login_tty(ptm.sfd);
+		return (0);
+	}
+	*fd = ptm.cfd;
+	close(ptm.sfd);
+	return (pid);
+}
-- 
cgit