Attachment 590 Details for Bug 830 – Add check EOF comming on stdin at session_setup time for protocol 2

[patch] Add check EOF comming on stdin at session_setup time for protocol 2

opensshpatch.txt (text/plain), 3.03 KB, created by Ignasi Roca on 2004-04-01 19:58:43 AEST

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Creator: Ignasi Roca

Created: 2004-04-01 19:58:43 AEST

Size: 3.03 KB

patch

obsolete

>diff -bur openssh-3.8p1.orig/channels.c openssh-3.8p1/channels.c
>--- openssh-3.8p1.orig/channels.c	Wed Jan 21 01:02:09 2004
>+++ openssh-3.8p1/channels.c	Thu Apr  1 10:51:09 2004
>@@ -134,6 +134,9 @@
> /* helper */
> static void port_open_helper(Channel *c, char *rtype);
> 
>+/* non_blocking switch */
>+static int in_non_blocking_mode = 0;
>+
> /* -- channel core */
> 
> Channel *
>@@ -2849,4 +2852,85 @@
> 	packet_start(SSH_CMSG_AGENT_REQUEST_FORWARDING);
> 	packet_send();
> 	packet_write_wait();
>+}
>+
>+
>+/* Restores stdin to blocking mode. */
>+
>+static void
>+leave_non_blocking(void)
>+{
>+	if (in_non_blocking_mode) {
>+		(void) fcntl(fileno(stdin), F_SETFL, 0);
>+		in_non_blocking_mode = 0;
>+	}
>+}
>+
>+/* Puts stdin terminal in non-blocking mode. */
>+
>+static void
>+enter_non_blocking(void)
>+{
>+	in_non_blocking_mode = 1;
>+	(void) fcntl(fileno(stdin), F_SETFL, O_NONBLOCK); }
>+
>+/*
>+ * This is called when the interactive is entered.  This checks if 
>+there is
>+ * an EOF coming on stdin.  We must check this explicitly, as select() 
>+does
>+ * not appear to wake up when redirecting from /dev/null.
>+ */
>+
>+void
>+channel_check_initial_eof_on_stdin(int id) {
>+	int len;
>+	char buf[1];
>+
>+	Channel *c = channel_lookup(id);
>+
>+	if (c == NULL) {
>+		logit("channel_check_initial_eof_on_stdin: %d: bad id", id);
>+		return;
>+	}
>+
>+	if ( c->type != SSH_CHANNEL_OPEN )
>+		return;
>+
>+	/*
>+	 * Try to read a single character; it appears
>+	 * that for some files, such /dev/null, select() never wakes up for
>+	 * read for this descriptor, which means that we never get EOF.  This
>+	 * way we will get the EOF if stdin comes from /dev/null or similar.
>+	 */
>+
>+	enter_non_blocking();
>+
>+	/* Check for immediate EOF on stdin. */
>+	len = read(c->rfd, buf, 1);
>+	if (len < 0 && (errno == EINTR || errno == EAGAIN)) {
>+		leave_non_blocking();
>+		return;
>+	}
>+
>+	leave_non_blocking();
>+
>+	if (len <= 0) {
>+		debug2("channel %d: read<=0 rfd %d len %d",
>+			c->self, c->rfd, len);
>+		chan_read_failed(c);
>+	} else {
>+		/*
>+	 	* Got data.  We must store the data in the buffer,
>+	 	* and also process it as an escape character if
>+	 	* appropriate.
>+	 	*/
>+		if (c->input_filter != NULL) {
>+			if (c->input_filter(c, buf, len) == -1) {
>+				debug2("channel %d: filter stops", c->self);
>+				chan_read_failed(c);
>+			}
>+		} else {
>+			buffer_append(&c->input, buf, 1);
>+		}
>+	}
> }
>diff -bur openssh-3.8p1.orig/channels.h openssh-3.8p1/channels.h
>--- openssh-3.8p1.orig/channels.h	Thu Oct  2 08:17:00 2003
>+++ openssh-3.8p1/channels.h	Thu Apr  1 10:26:14 2004
>@@ -165,6 +165,7 @@
> void	 channel_register_filter(int, channel_filter_fn *);
> void	 channel_cancel_cleanup(int);
> int	 channel_close_fd(int *);
>+void	 channel_check_initial_eof_on_stdin(int);
> 
> /* protocol handler */
> 
>--- openssh-3.8p1.orig/ssh.c	Wed Dec 17 06:33:11 2003
>+++ openssh-3.8p1/ssh.c	Thu Apr  1 10:31:57 2004
>@@ -1119,6 +1119,8 @@
> 		packet_send();
> 	}
> 
>+	channel_check_initial_eof_on_stdin(id);
>+
> 	packet_set_interactive(interactive);
> }
>

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