From 54c459866e2da288a3895eecf097104ac6f9f4d0 Mon Sep 17 00:00:00 2001
From: Damien Miller <djm@mindrot.org>
Date: Thu, 15 May 2003 10:20:13 +1000
Subject: [PATCH]    - markus@cvs.openbsd.org 2003/05/14 22:24:42     
 [clientloop.c session.c ssh.1]      allow to send a BREAK to the remote
 system; ok various

---
 ChangeLog    |  5 ++++-
 clientloop.c | 18 ++++++++++++++++--
 session.c    | 24 +++++++++++++++++++++++-
 ssh.1        |  4 +++-
 4 files changed, 46 insertions(+), 5 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index 8feae8b23..6ec753efe 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -10,6 +10,9 @@
      add experimental support for verifying hos keys using DNS as described
      in draft-ietf-secsh-dns-xx.txt. more information in README.dns.
      ok markus@ and henning@
+   - markus@cvs.openbsd.org 2003/05/14 22:24:42
+     [clientloop.c session.c ssh.1]
+     allow to send a BREAK to the remote system; ok various
 
 20030514
  - (djm) Bug #117: Don't lie to PAM about username
@@ -1485,4 +1488,4 @@
      save auth method before monitor_reset_key_state(); bugzilla bug #284;
      ok provos@
 
-$Id: ChangeLog,v 1.2702 2003/05/15 00:19:46 djm Exp $
+$Id: ChangeLog,v 1.2703 2003/05/15 00:20:13 djm Exp $
diff --git a/clientloop.c b/clientloop.c
index e5270aa57..1c1acf481 100644
--- a/clientloop.c
+++ b/clientloop.c
@@ -59,7 +59,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: clientloop.c,v 1.110 2003/05/11 20:30:24 markus Exp $");
+RCSID("$OpenBSD: clientloop.c,v 1.111 2003/05/14 22:24:42 markus Exp $");
 
 #include "ssh.h"
 #include "ssh1.h"
@@ -574,6 +574,19 @@ process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
 				/* We have been continued. */
 				continue;
 
+			case 'B':
+				if (compat20) {
+					snprintf(string, sizeof string,
+					    "%cB\r\n", escape_char);
+					buffer_append(berr, string,
+					    strlen(string));
+					channel_request_start(session_ident,
+					    "break", 0);
+					packet_put_int(1000);
+					packet_send();
+				}
+				continue;
+
 			case 'R':
 				if (compat20) {
 					if (datafellows & SSH_BUG_NOREKEY)
@@ -636,6 +649,7 @@ process_escapes(Buffer *bin, Buffer *bout, Buffer *berr, char *buf, int len)
 "%c?\r\n\
 Supported escape sequences:\r\n\
 %c.  - terminate connection\r\n\
+%cB  - send a BREAK to the remote system\r\n\
 %cC  - open a command line\r\n\
 %cR  - Request rekey (SSH protocol 2 only)\r\n\
 %c^Z - suspend ssh\r\n\
@@ -646,7 +660,7 @@ Supported escape sequences:\r\n\
 (Note that escapes are only recognized immediately after newline.)\r\n",
 				    escape_char, escape_char, escape_char, escape_char,
 				    escape_char, escape_char, escape_char, escape_char,
-				    escape_char, escape_char);
+				    escape_char, escape_char, escape_char);
 				buffer_append(berr, string, strlen(string));
 				continue;
 
diff --git a/session.c b/session.c
index 5b445f93b..796c5177c 100644
--- a/session.c
+++ b/session.c
@@ -33,7 +33,7 @@
  */
 
 #include "includes.h"
-RCSID("$OpenBSD: session.c,v 1.156 2003/05/11 20:30:25 markus Exp $");
+RCSID("$OpenBSD: session.c,v 1.157 2003/05/14 22:24:42 markus Exp $");
 
 #include "ssh.h"
 #include "ssh1.h"
@@ -1742,6 +1742,26 @@ session_exec_req(Session *s)
 	return 1;
 }
 
+static int
+session_break_req(Session *s)
+{
+	u_int break_length;
+
+	break_length = packet_get_int();
+	packet_check_eom();
+
+	if (s->ttyfd == -1)
+		return 0;
+	/* we will sleep from 500ms to 3000ms */
+	break_length = MIN(break_length, 3000);
+	break_length = MAX(break_length,  500);
+	ioctl(s->ttyfd, TIOCSBRK, NULL);
+	/* should we care about EINTR? */
+	usleep(break_length * 1000);
+	ioctl(s->ttyfd, TIOCCBRK, NULL);
+	return 1;
+}
+
 static int
 session_auth_agent_req(Session *s)
 {
@@ -1789,6 +1809,8 @@ session_input_channel_req(Channel *c, const char *rtype)
 			success = session_auth_agent_req(s);
 		} else if (strcmp(rtype, "subsystem") == 0) {
 			success = session_subsystem_req(s);
+		} else if (strcmp(rtype, "break") == 0) {
+			success = session_break_req(s);
 		}
 	}
 	if (strcmp(rtype, "window-change") == 0) {
diff --git a/ssh.1 b/ssh.1
index a7e95c1f4..8f91ba754 100644
--- a/ssh.1
+++ b/ssh.1
@@ -34,7 +34,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.\" $OpenBSD: ssh.1,v 1.169 2003/04/12 11:40:15 naddy Exp $
+.\" $OpenBSD: ssh.1,v 1.170 2003/05/14 22:24:42 markus Exp $
 .Dd September 25, 1999
 .Dt SSH 1
 .Os
@@ -301,6 +301,8 @@ Background ssh at logout when waiting for forwarded connection / X11 sessions
 to terminate
 .It Cm ~?
 Display a list of escape characters
+.It Cm ~B
+Send a BREAK to the remote system.
 .It Cm ~C
 Open command line (only useful for adding port forwardings using the
 .Fl L